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Sample records for preimplantation hla testing

  1. Preimplantation HLA typing for stem cell transplantation treatment of hemoglobinopathies

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    Anver Kuliev

    2014-09-01

    Full Text Available Preimplantation genetic diagnosis (PGD for HLA typing is steadily becoming an option for at risk couples with thalassemic children, requiring HLA matched bone marrow transplantation treatment. The paper presents the world’s largest PGD experience of 475 cases for over 2 dozens thalassemia mutations, resulting in birth of 132 unaffected children. A total of 146 cases were performed together with preimplantation HLA typing, resulting in detection and transfer of HLA matched unaffected embryos in 83 of them, yielding the birth of 16 HLA matched children, potential donors for their affected siblings. The presented experience of HLA matched stem cell transplantation for thalassemia, following PGD demonstrated a successful hematopoietic reconstitution both for younger and older patients. The data show that PGD is an efficient approach for HLA matched stem cell transplantation treatment for thalassemia.

  2. [Extending preimplantation genetic diagnosis to HLA typing: the French exception].

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    Steffann, Julie; Frydman, Nelly; Burlet, Philippe; Gigarel, Nadine; Hesters, Laetitia; Kerbrat, Violaine; Lamazou, Frédéric; Munnich, Arnold; Frydman, René

    2011-01-01

    Umut-Talha, a "sibling savior", was born on 26 January 2011 at Beclère Hospital after embryo selection at the Paris preimplantation genetic diagnosis (PGD) center. His birth revived the controversy over "double PGD". This procedure, authorized in France since 2006, allows couples who already have a child with a serious, incurable genetic disease, to opt for PGD in order to select a healthy embryo that is HLA-matched to the affected sibling and who may thus serve as an ombilical cord blood donor. The procedure is particularly complex and the baby take-home rate is still very low. Double PGD is strictly regulated in France, and candidate couples must first receive individual authorization from the Biomedicine Agency. In our experience, these couples have a strong desire to have children, as reflected by the large number of prior spontaneous pregnancies (25% of couples). Likewise, most of these couples request embryo transfer even when there is no HLA-matched embryo, which accounts for more than half of embryo transfers. The controversy surrounding this practice has flared up again in recent weeks, over the concepts of "designer babies" and "double savior siblings" (the baby is selected to be free of the hereditary disease, and may also serve as a stem cell donor for the affected sibling).

  3. Novel One-Step Multiplex PCR-Based Method for HLA Typing and Preimplantational Genetic Diagnosis of -Thalassemia

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    Raquel M. Fernández

    2013-01-01

    Full Text Available Preimplantation genetic diagnosis (PGD of single gene disorders, combined with HLA matching (PGD-HLA, has emerged as a tool for couples at risk of transmitting a genetic disease to select unaffected embryos of an HLA tissue type compatible with that of an existing affected child. Here, we present a novel one-step multiplex PCR to genotype a spectrum of STRs to simultaneously perform HLA typing and PGD for -thalassemia. This method is being routinely used for PGD-HLA cycles in our department, with a genotyping success rate of 100%. As an example, we present the first successful PGD-HLA typing in Spain, which resulted in the birth of a boy and subsequent successful HSC transplantation to his affected brother, who is doing well 4 years following transplantation. The advantage of our method is that it involves only a round of single PCR for multiple markers amplification (up to 10 markers within the HLA and 6 markers at the -globin loci. This strategy has allowed us to considerably reduce the optimization of the PCR method for each specific PGD-HLA family as well as the time to obtain molecular results in each cycle.

  4. [Huntington disease: presymptomatic testing, prenatal diagnosis, preimplantation genetic diagnosis experience].

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    Durr, A; Viville, S

    2007-10-01

    Presymptomatic testing for Huntington disease has been available for 15 years. The possibility of determining the genetic status of an at-risk person for the disorder which runs in his or her family raises questions because of the absence of preventive treatments. In addition, being carrier does not allow to determine when the disease starts and how it will evolve, impairing the possibilities of planning the future. A pluridisciplinary approach to predictive testing with care before, during and after the test taking into account the medical, social and psychological aspects of the disease is good practice. At the present time, only a minority of at-risk individuals request presymptomatic testing and almost 50% do not pursue until the results. The consequences of the test may be harmful, more frequently after an unfavorable than after a favorable result. Motivations and the outcome in terms of request for prenatal testing after a carrier result are known today and the number or prenatal testing remains very limited. Preimplantation genetic testing is an alternative for couples who knows or do not their own genetic status. We report our experience in two French centres: Paris for presymptomatic and prenatal testing and Strasbourg for preimplantation diagnosis.

  5. Experience of Preimplantation Genetic Diagnosis with HLA Matching at the University Hospital Virgen del Rocío in Spain: Technical and Clinical Overview

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    Raquel María Fernández

    2014-01-01

    Full Text Available Preimplantation genetic diagnosis (PGD of genetic diseases, combined with HLA matching (PGD-HLA, is an option for couples at risk of transmitting a genetic disease to select unaffected embryos of an HLA tissue type compatible with that of an existing affected child. Here we present the results of our PGD-HLA program at the Department of Genetics, Reproduction and Fetal Medicine of the University Hospital Virgen del Rocío in Seville. Seven couples have participated in our program because of different indications. Overall, 26 cycles were performed, providing a total of 202 embryos. A conclusive molecular diagnosis and HLA-typing could be assured in 96% of the embryos. The percentage of transfers per cycle was 26.9% and the birth rate per cycle was 7.7% per transfer. Our PGD-HLA program resulted in the birth of 2 healthy babies, HLA-identical to their affected siblings, with successful subsequent haematopoietic stem cell (HSC transplantations. Both HSC-transplanted children are currently doing well 48 and 21 months following transplantation, respectively. All the procedures, including HSCs umbilical cord transplantation, were performed in our hospital.

  6. Preimplantation genetic diagnosis for Huntington's disease with exclusion testing.

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    Sermon, Karen; De Rijcke, Martine; Lissens, Willy; De Vos, Anick; Platteau, Peter; Bonduelle, Maryse; Devroey, Paul; Van Steirteghem, André; Liebaers, Inge

    2002-10-01

    Huntington's disease is an autosomal dominant, late-onset disorder, for which the gene and the causative mutation have been known since 1993. Some at-risk patients choose for presymptomatic testing and can make reproductive choices accordingly. Others however, prefer not to know their carrier status, but may still wish to prevent the birth of a carrier child. For these patients, exclusion testing after prenatal sampling has been an option for many years. A disadvantage of this test is that unaffected pregnancies may be terminated if the parent at risk (50%) has not inherited the grandparental Huntington gene, leading to serious moral and ethical objections. As an alternative, preimplantation genetic diagnosis (PGD) on embryos obtained in vitro may be proposed, after which only embryos free of risk are replaced. Embryos can then be selected, either by the amplification of the CAG repeat in the embryos without communicating results to the patients (ie non-disclosure testing), which brings its own practical and moral problems, or exclusion testing. We describe here the first PGD cycles for exclusion testing for Huntington's disease in five couples. Three couples have had at least one PGD cycle so far. One pregnancy ensued and a healthy female baby was delivered.

  7. New Advances of Preimplantation and Prenatal Genetic Screening and Noninvasive Testing as a Potential Predictor of Health Status of Babies

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    Tanya Milachich

    2014-01-01

    Full Text Available The current morphologically based selection of human embryos for transfer cannot detect chromosome aneuploidies. So far, only biopsy techniques have been able to screen for chromosomal aneuploidies in the in vitro fertilization (IVF embryos. Preimplantation genetic diagnosis (PGD or screening (PGS involves the biopsy of oocyte polar bodies or embryonic cells and has become a routine clinical procedure in many IVF clinics worldwide, including recent development of comprehensive chromosome screening of all 23 pairs of chromosomes by microarrays for aneuploidy screening. The routine preimplantation and prenatal genetic diagnosis (PND require testing in an aggressive manner. These procedures may be invasive to the growing embryo and fetus and potentially could compromise the clinical outcome. Therefore the aim of this review is to summarize not only the new knowledge on preimplantation and prenatal genetic diagnosis in humans, but also on the development of potential noninvasive embryo and fetal testing that might play an important role in the future.

  8. Next generation sequencing for preimplantation genetic testing of blastocysts aneuploidies in women of different ages

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    Krzysztof Lukaszuk

    2015-12-01

    Full Text Available Most of the current preimplantation genetic screening of aneuploidies tests are based on the low quality and low density comparative genomic hybridization arrays. The results are based on fewer than 2,700 probes. Our main outcome was the association of aneuploidy rates and the women’s age. Between August–December 2013, 198 blastocysts from women (mean age 36.3+-4.6 undergoing in vitro fertilization underwent routine trophectoderm biopsy. NGS was performed on Ion Torrent PGM (Life Technologies. The results were analyzed in five age groups (<31, 31–35, 36–38, 39–40 and >40. 85 blastocysts were normal according to NGS results. The results in the investigated groups were (% of normal blastocyst in each group: <31 (41.9%, 31–35 (47.6%, 36–38 (47.8%, 39–40 (37.7% and >40 (38.5%. Our study suggests that NGS PGD is applicable for routine preimplantation genetic testing. It allows also for easy customization of the procedure for each individual patient making personalized diagnostics a reality.

  9. Diagnostic accuracy: theoretical models for preimplantation genetic testing of a single nucleus using the fluorescence in situ hybridization technique

    NARCIS (Netherlands)

    P.N. Scriven; P.M.M. Bossuyt

    2010-01-01

    The aim of this study was to develop and use theoretical models to investigate the accuracy of the fluorescence in situ hybridization (FISH) technique in testing a single nucleus from a preimplantation embryo without the complicating effect of mosaicism. Mathematical models were constructed for thre

  10. Human leukocyte antigen (HLA) pharmacogenomic tests: potential and pitfalls.

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    Daly, Ann K

    2014-02-01

    Adverse drug reactions involving a range of prescribed drugs and affecting the skin, liver and other organs show strong associations with particular HLA alleles. For some reactions, HLA typing prior to prescription, so that those positive for the risk allele are not given the drug associated with the reaction, shows high positive and negative predictive values. The best example of clinical implementation relates to the hypersensitivity reaction induced by the anti-HIV drug abacavir. When this reaction is phenotyped accurately, 100% of those who develop it are positive for HLA-B*57:01. Drug regulators worldwide now recommend genotyping for HLA-B*57:01 before abacavir is prescribed. Serious skin rashes including Stevens-Johnson syndrome and toxic epidermal necrosis can be induced by carbamazepine and other anticonvulsant drugs. In certain East Asians, these reactions are significantly associated with HLA-B*15:02, and typing for this allele is now recommended prior to carbamazepine prescription in these populations. Other HLA associations have been described for skin rash induced by carbamazepine, allopurinol and nevirapine and for liver injury induced by flucloxacillin, amoxicillin-clavulanate, lapatanib, lumiracoxib and ticlopidine. However, the predictive values for typing HLA alleles associated with these adverse reactions are lower. Clinical implementation therefore seems unlikely. Performing HLA typing is relatively complex compared with genotyping assays for single nucleotide polymorphisms. With emphasis on HLA-B*57:01, the approaches used commonly, including use of sequence-specific oligonucleotide PCR primers and DNA sequencing are considered, together with their successful implementation. Genotyping single nucleotide polymorphisms tagging HLA alleles is a simpler alternative to HLA typing but appears insufficiently accurate for clinical use.

  11. Preimplantation Genetic Diagnosis: Prenatal Testing for Embryos Finally Achieving Its Potential

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    Harvey J. Stern

    2014-03-01

    Full Text Available Preimplantation genetic diagnosis was developed nearly a quarter-century ago as an alternative form of prenatal diagnosis that is carried out on embryos. Initially offered for diagnosis in couples at-risk for single gene genetic disorders, such as cystic fibrosis, spinal muscular atrophy and Huntington disease, preimplantation genetic diagnosis (PGD has most frequently been employed in assisted reproduction for detection of chromosome aneuploidy from advancing maternal age or structural chromosome rearrangements. Major improvements have been seen in PGD analysis with movement away from older, less effective technologies, such as fluorescence in situ hybridization (FISH, to newer molecular tools, such as DNA microarrays and next generation sequencing. Improved results have also started to be seen with decreasing use of Day 3 blastomere biopsy in favor of polar body or Day 5 trophectoderm biopsy. Discussions regarding the scientific, ethical, legal and social issues surrounding the use of sequence data from embryo biopsy have begun and must continue to avoid concern regarding eugenic or inappropriate use of this technology.

  12. Preimplantation genetic screening as an alternative to prenatal testing for Down syndrome : preferences of women undergoing in vitro fertilization/intracytoplasmic sperm injection treatment

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    Twisk, Moniek; Haadsma, Maaike L.; van der Veen, Fulco; Repping, Sjoerd; Mastenbroek, Sebastiaan; Heineman, Maas-Jan; Bossuyt, Patrick M. M.; Korevaar, Johanna C.

    2007-01-01

    Objective: Although the primary goal of preimplantation genetic screening (PGS) is to increase pregnancy rates in women undergoing IVF/intracytoplasmic sperm injection treatment, it has been suggested that it may also be used as an alternative to prenatal testing for Down syndrome. Design: Trade-off

  13. Preimplantation Genetic Screening: An Effective Testing for Infertile and Repeated Miscarriage Patients?

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    Ning Wang

    2010-01-01

    Full Text Available Aneuploidy in pregnancy is known to increase with advanced maternal age (AMA and associate with repeated implantation failure (RIF, and repeated miscarriage (RM. Preimplantation genetic screening (PGS has been introduced into clinical practice, screening, and eliminating aneuploidy embryos, which can improve the chance of conceptions for infertility cases with poor prognosis. These patients are a good target group to assess the possible benefit of aneuploidy screening. Although practiced widely throughout the world, there still exist some doubts about the efficacy of this technique. Recent randomized trials were not as desirable as we expected, suggesting that PGS needs to be reconsidered. The aim of this review is to discuss the efficacy of PGS.

  14. HLA-restricted responses to M and N determinants in the primed lymphocyte test.

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    Singal, D P; Blajchman, M A; Naipaul, N; Heddle, N

    1981-12-01

    We have studied the role of MNSs determinants in the primed lymphocyte test (PLT). The data demonstrate that incompatibility associated with the M or N antigens causes HLA-restricted proliferative responses in PLT. Responses to the M or N determinants required the presence of the same HLA-A antigen(s) on both the stimulator and the responder cells. No effects of S or s incompatibility were observed in this test. This is the first report of lymphocyte proliferative responses to "minor" alloantigens that require corecognition of the MHC determinants. These observations suggest possible new biological functions of these blood group antigens.

  15. Improving prediction of type 1 diabetes by testing non-HLA genetic variants in addition to HLA markers

    NARCIS (Netherlands)

    Steck, Andrea K.; Dong, Fran; Wong, Randall; Fouts, Alexandra; Liu, Edwin; Romanos, Jihane; Wijmenga, Cisca; Norris, Jill M.; Rewers, Marian J.

    2014-01-01

    Objective: The purpose of this study was to explore whether non-human leukocyte antigen (non-HLA) genetic markers can improve type 1 diabetes (T1D) prediction in a prospective cohort with high-risk HLA-DR, DQ genotypes. Methods: The Diabetes Autoimmunity Study in the Young (DAISY) follows prospectiv

  16. Preimplantation genetic diagnosis: state of the art.

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    Basille, Claire; Frydman, René; El Aly, Abdelwahab; Hesters, Laetitia; Fanchin, Renato; Tachdjian, Gérard; Steffann, Julie; LeLorc'h, Marc; Achour-Frydman, Nelly

    2009-07-01

    Preimplantation genetic diagnosis (PGD) is used to analyze embryos genetically before their transfer into the uterus. It was developed first in England in 1990, as part of progress in reproductive medicine, genetic and molecular biology. PGD offers couples at risk the chance to have an unaffected child, without facing termination of pregnancy. Embryos are obtained by in vitro fertilization with intracytoplasmic sperm injection (ICSI), and are biopsied mostly on day 3; blastocyst biopsy is mentioned as a possible alternative. The genetic analysis is performed on one or two blastomeres, by fluorescent in situ hybridization (FISH) for cytogenetic diagnosis, or polymerase chain reaction (PCR) for molecular diagnosis. Genetic analysis of the first or second polar body can be used to study maternal genetic contribution. Only unaffected embryos are transferred into the uterus. To improve the accuracy of the diagnosis, new technologies are emerging, with comparative genomic hybridization (CGH) and microarrays. In Europe, depending on national regulations, PGD is either prohibited, or allowed, or practiced in the absence of recommendations. The indications are chromosomal abnormalities, X-linked diseases or single gene disorders. The number of disorders being tested increases. In Europe, data collection from the year 2004 reports that globally 69.6% of cycles lead to embryo transfer and implantation rate is 17%. European results from the year 2004 show a clinical pregnancy rate of 18% per oocyte retrieval and 25% per embryo transfer, leading to 528 babies born. The cohort studies concerning the paediatric follow-up of PGD babies show developmental outcomes similar to children conceived after IVF-ICSI. Recent advances include human leucocyte antigen (HLA) typing for PGD embryos, when an elder sibling is affected with a genetic disorder and needs stem cell transplantation. The HLA-matched offspring resulting can give cord blood at birth. Preimplantation genetic screening (PGS

  17. The experience of two European preimplantation genetic diagnosis centres on human leukocyte antigen typing.

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    Van de Velde, Hilde; De Rycke, Martine; De Man, Caroline; De Hauwere, Kim; Fiorentino, Francesco; Kahraman, Semra; Pennings, Guido; Verpoest, Willem; Devroey, Paul; Liebaers, Inge

    2009-03-01

    Two European centres report on human leukocyte antigen (HLA) typing of preimplantation embryos for haematopoietic stem cell (HSC) transplantation: 'UZ Brussel' in Brussels and 'Genoma' in Rome. Both centres have 6 years' experience with technical and clinical aspects of this type of genetic analysis on single blastomeres. Both centres apply a similar technique for preimplantation HLA typing using short tandem repeats linked to the HLA locus in multiplex PCR for haplotyping. At present, a conclusive HLA diagnosis could be assured in 92.8% and 90.3% of the embryos at UZ Brussel and at Genoma, respectively. The implantation rates were 32.4% and 28.2%, respectively, and the birth rates per cycle were 9.4% and 18.6%, respectively. The HLA programme at UZ Brussel and at Genoma resulted in the birth of 9 babies and 3 successful HSC transplantations, and 42 babies and 7 successful HSC transplantations, respectively, so far. Drastic embryo selection for preimplantation HLA typing (in theory 1/4 for HLA, 1/8 for HLA in combination with sexing for X-linked recessive diseases, 3/16 for HLA in combination with autosomal recessive disorders) resulted overall in the birth of 51 babies (15.9% live birth rate per started cycle) in two European centres.

  18. Preimplantation genetic diagnosis

    DEFF Research Database (Denmark)

    Bay, Bjorn; Ingerslev, Hans Jakob; Lemmen, Josephine Gabriela

    2016-01-01

    OBJECTIVE: To study whether women conceiving after preimplantation genetic diagnosis (PGD) and their children have greater risks of adverse pregnancy and birth outcomes compared with children conceived spontaneously or after IVF with or without intracytoplasmic sperm injection (ICSI). DESIGN...

  19. External quality assessment of patient HLA-B*57:01 testing prior to abacavir prescription.

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    Darke, C; Corbin, S A

    2014-08-01

    Hypersensitivity reactions to the drug abacavir are strongly associated with possession of HLA-B*57:01. Hence, patients with HIV/AIDS who may be prescribed abacavir should be tested for this HLA allele and the drug withheld from those that possess B*57:01. The UK National External Quality Assessment Service for Histocompatibility and Immunogenetics has operated a scheme for B*57:01 testing since 2008 which, in 2013, involved 47 participants from 12 countries. A total of 24 B*57:01-positive, 2 B*57:03-positive and 22 B*57-negative blood samples (including 2 B*58 samples) were distributed to between 28 and 47 laboratories each year over 6 years. Participants, who were unaware of the samples' HLA types, tested and reported on their B*57/B*57:01 status. A total of 1868 reports were assessed over the 6 years. Of the 880 reports on B*57:01 samples, 93.4% were correctly assigned as B*57:01, 2.8% were assigned as groups of B*57 alleles including B*57:01, and 3.3% were reported as B*57 positive only. Over the 6 years, there were four (0.46%) false B*57:01 negative reports. All the B*57:03-positive and B*57-negative samples, involving 72 and 916 assignments, respectively, were essentially reported as B*57:01 negative. Thus, there were no false B57:01 positive assignments. The reporting of B*57:01 status over the last 3 years of the scheme was 99.8% sensitive and 100% specific. Over the last year, it was 100% sensitive and 100% specific.

  20. Combination Testing Using a Single MSH5 Variant alongside HLA Haplotypes Improves the Sensitivity of Predicting Coeliac Disease Risk in the Polish Population.

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    Agnieszka Paziewska

    Full Text Available Assessment of non-HLA variants alongside standard HLA testing was previously shown to improve the identification of potential coeliac disease (CD patients. We intended to identify new genetic variants associated with CD in the Polish population that would improve CD risk prediction when used alongside HLA haplotype analysis. DNA samples of 336 CD and 264 unrelated healthy controls were used to create DNA pools for a genome wide association study (GWAS. GWAS findings were validated with individual HLA tag single nucleotide polymorphism (SNP typing of 473 patients and 714 healthy controls. Association analysis using four HLA-tagging SNPs showed that, as was found in other populations, positive predicting genotypes (HLA-DQ2.5/DQ2.5, HLA-DQ2.5/DQ2.2, and HLA-DQ2.5/DQ8 were found at higher frequencies in CD patients than in healthy control individuals in the Polish population. Both CD-associated SNPs discovered by GWAS were found in the CD susceptibility region, confirming the previously-determined association of the major histocompatibility (MHC region with CD pathogenesis. The two most significant SNPs from the GWAS were rs9272346 (HLA-dependent; localized within 1 Kb of DQA1 and rs3130484 (HLA-independent; mapped to MSH5. Specificity of CD prediction using the four HLA-tagging SNPs achieved 92.9%, but sensitivity was only 45.5%. However, when a testing combination of the HLA-tagging SNPs and the MSH5 SNP was used, specificity decreased to 80%, and sensitivity increased to 74%. This study confirmed that improvement of CD risk prediction sensitivity could be achieved by including non-HLA SNPs alongside HLA SNPs in genetic testing.

  1. More than 10 years after the first 'savior siblings': parental experiences surrounding preimplantation genetic diagnosis.

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    Zierhut, Heather; MacMillan, Margaret L; Wagner, John E; Bartels, Dianne M

    2013-10-01

    Preimplantation genetic diagnosis (PGD) to create a healthy donor for a sibling's hematopoetic stem cell transplantation for a child with Fanconi Anemia (FA) was first reported in 2001. Yet we know little about the experiences of parents who have encountered decision making surrounding PGD and human leukocyte antigen (HLA)-typing. The first aim of this study was to understand parents' awareness, perceptions and beliefs about reproductive decision-making including emotional, cognitive, moral dimensions as well as regret surrounding the use of this technology. The second aim was to describe the experiences and rationale of parents of children with a single gene disorder regarding the factors that influenced their decision making surrounding the use of natural pregnancy and/or PGD and HLA-typing. Parents from two national FA support networks in the US and Canada responded to an emailed survey about reproductive decision making and outcomes surrounding natural pregnancy and PGD and HLA-typing. Descriptive statistics and Pearson's Chi-Square tests were used to describe and compare data. Our results indicate that the most important factors in the PGD decision making process were the health of the child and cognitive appraisals followed by emotional responses and then moral judgments. A significant difference was noted in parents considering natural pregnancy before and after 2001 (p = 0.01). Unexpected findings were that less than 35 % of parents were offered PGD by any health care professional and only 70 % were aware PGD with HLA-typing was a reproductive option. Our research suggests that the option of PGD and HLA-typing may influence parents' reproductive decision making choices.

  2. Enhancing capacitive DNA biosensor performance by target overhang with application on screening test of HLA-B*58:01 and HLA-B*57:01 genes.

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    Thipmanee, Orawan; Numnuam, Apon; Limbut, Warakorn; Buranachai, Chittanon; Kanatharana, Proespichaya; Vilaivan, Tirayut; Hirankarn, Nattiya; Thavarungkul, Panote

    2016-08-15

    A highly sensitive label-free DNA biosensor based on PNA probes immobilized on a gold electrode was used to detect a hybridization event. The effect of a target DNA overhang on the hybridization efficiency was shown to enhance the detected signal and allowed detection at a very low concentration. The sensors performances were investigated with a complementary target that had the same length as the probe, and the signal was compared to the target DNAs with different lengths and overhangs. A longer target DNA overhang was found to provide a better response. When the overhang was on the electrode side the signal enhancement was greater than when the overhang was on the solution side due to the increased thickness of the sensing surface, hence produced a larger capacitance change. Using conformationally constrained acpcPNA probes, double stranded DNA was detected sensitively and specifically without any denaturing step. When two acpcPNA probes were applied for the screening test for the double stranded HLA-B*58:01 and HLA-B*57:01 genes that are highly similar, the method differentiated the two genes in all samples. Both purified and unpurified PCR products gave comparable results. This method would be potentially useful as a rapid screening test without the need for purification and denaturation of the PCR products.

  3. What is the preimplantation embryo?

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    Krones, Tanja; Schlüter, Elmar; Neuwohner, Elke; El Ansari, Susan; Wissner, Thomas; Richter, Gerd

    2006-07-01

    We present results from our 'bioethical field studies', which explore and compare the views of experts, patients and the general public on the beginning of human life and the status of the preimplantation embryo in Germany. Using a qualitative and quantitative multi-method approach, we found crucial differences in the categorization of the beginning of human life within the expert group (representative samples of human geneticists n=104, ethicists n=168, midwives n=294, obstetricians n=147, paediatricians n=166), and between expert and lay samples (IVF couples n=108, high genetic risk couples n=324, general population n=1017). The majority of lay respondents as well as paediatricians and obstetricians chose nidation, the moment when the implantation of the fertilized egg into the uterus takes place, as the crucial boundary that marks the beginning of human life, whereas the majority of (female) human geneticists, ethicists and midwives voted for conception as the decisive point in time. The views of all groups on the status of the preimplantation embryo differed from the assumptions underlying German legislation (Embryo Protection Act). Religiousness and religious affiliation, gender, attitudes towards disabled people, post-material values and a present desire for a child were identified as independent factors influencing attitudes towards the preimplantation embryo in the population sample. The results are discussed within a broader philosophical and social science perspective of constructivism versus essentialism, proposing a truly interdisciplinary approach to such bioethical core issues as new reproductive technologies and the status of the preimplantation embryo.

  4. Soluble HLA-G expression and renal graft acceptance.

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    Qiu, J; Terasaki, P I; Miller, J; Mizutani, K; Cai, J; Carosella, E D

    2006-09-01

    HLA-G is a potentially interesting molecule associated with immunosuppressive function. We survey here the presence of soluble HLA-G (sHLA-G) in serial serum samples of renal transplants. A total of 330 sera of from 65 patients were tested for sHLA-G with ELISA. IgG/IgM antibodies to HLA, and MICA antibodies were also previously tested. After serial analysis of the 65 patients' 330 sera, 50% of 26 patients in functioning group had consistent sHLA-G expression or became positive, in comparison to 20.5% among 39 patients who rejected their transplants (p=0.013). Thus sHLA-G was associated with functioning transplants. Eighty percent (77 of 96) of the HLA IgG positive sera had no sHLA-G expression, while 81.4% (83 of 102) of the HLA-G(+) sera had no HLA IgG (p=0.005), which showed a negative association between sHLA-G and the presence of HLA IgG antibodies (which was previously been shown to be associated with failure). In this preliminary survey, sHLA-G was found in the serum of about 30% of renal transplant patients. sHLA-G had a negative association with allograft failure from chronic rejection, and a negative relationship with the production of HLA IgG antibodies. The significance of sHLA-G in renal transplants remains to be determined.

  5. Preimplantation genetic diagnosis for Down syndrome pregnancy

    Institute of Scientific and Technical Information of China (English)

    ZHANG Yu; XU Chen-ming; ZHU Yi-min; DONG Min-yue; QIAN Yu-li; JIN Fan; HUANG He-feng

    2007-01-01

    Objective: To evaluate the effect of preimplantation genetic diagnosis (PGD) conducted for women who had Down syndrome pregnancy previously. Methods: Trisomy 21 was diagnosed by using fluorescence in site hybridization (FISH) before embryo transfer in two women who had Down syndrome pregnancies. Each received one or two PGD cycles respectively. Results:Case 1: one PGD cycle was conducted, two oocytes were fertilized and biopsied. One embryo is of trisomy 21 and the other of monosomy 21. No embryo was transferred. Case 2: two PGD cycles were conducted, in total, sixteen oocytes were fertilized and biopsied. Four embryos were tested to be normal, six of trisomy 21, and one of monosomy 21. Five had no signal. Four normal embryos were transferred but no pregnancy resulted. Conclusion: For couples who had pregnancies with Down syndrome previously, PGD can be considered, and has been shown to be an effective strategy.

  6. Preimplantation genetic diagnosis

    Directory of Open Access Journals (Sweden)

    Karin Writzl

    2013-02-01

    Conclusions: Over the last two decades, PGD has been shown to be a reliable and safe genetic test for couples who are at risk of a specific inher - ited disorder. For PGS, the results from several ongoing randomized controlled trials performed at different cell biopsy stage, using array-CGH and SNP array will provide the data needed to evaluate the clinical efficacy.

  7. Efficient delivery of DNA and morpholinos into mouse preimplantation embryos by electroporation.

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    Hui Peng

    Full Text Available Mouse preimplantation development is characterized by three major transitions and two lineage segregations. Each transition or lineage segregation entails pronounced changes in the pattern of gene expression. Thus, research into the function of genes with obvious changes in expression pattern will shed light on the molecular basis of preimplantation development. We have described a simplified and effective method--electroporation--of introducing plasmid DNA and morpholinos into mouse preimplantation embryos and verified effectiveness of this approach by testing the procedure on the endogenous gene Oct4. Before electroporation, the zona pellucida was weakened by the treatment of acid Tyrode's solution. Then we optimized the parameters such as voltage, pulse duration, number of pulses and repeats, and applied these parameters to subsequent experiments. Compared with the control groups, the number of apoptotic cells and the expression and localization of OCT3/4 or CDX2 was not significantly changed in blastocysts developed from 1-cell embryos, which were electroporated with pIRES2-AcGFP1-Nuc eukaryotic expression vector or mismatched morpholino oligonucleotides. Furthermore, electroporated plasmid DNA and morpholinos targeting the endogenous gene Oct4 were able to sharply down regulate expression of OCT4 protein and actually cause expected phenotypes in mouse preimplantation embryos. In conclusion, plasmid DNA and morpholinos could be efficient delivered into mouse preimplantation embryos by electroporation and exert their functions, and normal development of preimplantation embryos was not affected.

  8. Complementarity of Binding Motifs is a General Property of HLA-A and HLA-B Molecules and Does Not Seem to Effect HLA Haplotype Composition.

    Science.gov (United States)

    Rao, Xiangyu; De Boer, Rob J; van Baarle, Debbie; Maiers, Martin; Kesmir, Can

    2013-01-01

    Different human leukocyte antigen (HLA) haplotypes (i.e., the specific combinations of HLA-A, -B, -DR alleles inherited together from one parent) are observed in different frequencies in human populations. Some haplotypes, like HLA-A1-B8, are very frequent, reaching up to 10% in the Caucasian population, while others are very rare. Numerous studies have identified associations between HLA haplotypes and diseases, and differences in haplotype frequencies can in part be explained by these associations: the stronger the association with a severe (autoimmune) disease, the lower the expected HLA haplotype frequency. The peptide repertoires of the HLA molecules composing a haplotype can also influence the frequency of a haplotype. For example, it would seem advantageous to have HLA molecules with non-overlapping binding specificities within a haplotype, as individuals expressing such an haplotype would present a diverse set of peptides from viruses and pathogenic bacteria on the cell surface. To test this hypothesis, we collect the proteome data from a set of common viruses, and estimate the total ligand repertoire of HLA class I haplotypes (HLA-A-B) using in silico predictions. We compare the size of these repertoires to the HLA haplotype frequencies reported in the National Marrow Donor Program (NMDP). We find that in most HLA-A and HLA-B pairs have fairly distinct binding motifs, and that the observed haplotypes do not contain HLA-A and -B molecules with more distinct binding motifs than random HLA-A and HLA-B pairs. In addition, the population frequency of a haplotype is not correlated to the distinctness of its HLA-A and HLA-B peptide binding motifs. These results suggest that there is a not a strong selection pressure on the haplotype level favoring haplotypes having HLA molecules with distinct binding motifs, which would result the largest possible presented peptide repertoires in the context of infectious diseases.

  9. Complementarity of binding motifs is a general property of HLA-A and HLA-B molecules and does not seem to effect HLA haplotype composition

    Directory of Open Access Journals (Sweden)

    Xiangyu eRao

    2013-11-01

    Full Text Available Different HLA haplotypes (i.e., the specific combinations of HLA-A, -B, -DR alleles inherited together from one parent are observed in different frequencies in human populations. Some haplotypes, like HLA-A1-B8, are very frequent, reaching up to 10% in the Caucasian population, while others are very rare. Numerous studies have identified associations between HLA haplotypes and diseases, and differences in haplotype frequencies can in part be explained by these associations: the stronger the association with a severe (autoimmune disease, the lower the expected HLA haplotype frequency. The peptide repertoires of the HLA molecules composing a haplotype can also influence the frequency of a haplotype. For example, it would seem advantageous to have HLA molecules with non-overlapping binding specificities within a haplotype, as individuals expressing such an haplotype would present a diverse set of peptides from viruses and pathogenic bacteria on the cell surface. To test this hypothesis, we collect the proteome data from a set of common viruses, and estimate the total ligand repertoire of HLA class I haplotypes (HLA-A-B using in silico predictions. We compare the size of these repertoires to the HLA haplotype frequencies reported in the National Marrow Donor Program (NMDP. We find that in most HLA-A and HLA-B pairs have fairly distinct binding motifs, and that the observed haplotypes do not contain HLA-A and –B molecules with more distinct binding motifs than random HLA-A and HLA-B pairs. In addition, the population frequency of a haplotype is not correlated to the distinctness of its HLA-A and HLA-B peptide binding motifs. These results suggest that there is a not a strong selection pressure on the haplotype level favouring haplotypes having HLA molecules with distinct binding motifs, which would result the largest possible presented peptide repertoires in the context of infectious diseases.

  10. Imputing Variants in HLA-DR Beta Genes Reveals That HLA-DRB1 Is Solely Associated with Rheumatoid Arthritis and Systemic Lupus Erythematosus.

    Directory of Open Access Journals (Sweden)

    Kwangwoo Kim

    Full Text Available The genetic association of HLA-DRB1 with rheumatoid arthritis (RA and systemic lupus erythematosus (SLE is well documented, but association with other HLA-DR beta genes (HLA-DRB3, HLA-DRB4 and HLA-DRB5 has not been thoroughly studied, despite their similar functions and chromosomal positions. We examined variants in all functional HLA-DR beta genes in RA and SLE patients and controls, down to the amino-acid level, to better understand disease association with the HLA-DR locus. To this end, we improved an existing HLA reference panel to impute variants in all protein-coding HLA-DR beta genes. Using the reference panel, HLA variants were inferred from high-density SNP data of 9,271 RA-control subjects and 5,342 SLE-control subjects. Disease association tests were performed by logistic regression and log-likelihood ratio tests. After imputation using the newly constructed HLA reference panel and statistical analysis, we observed that HLA-DRB1 variants better accounted for the association between MHC and susceptibility to RA and SLE than did the other three HLA-DRB variants. Moreover, there were no secondary effects in HLA-DRB3, HLA-DRB4, or HLA-DRB5 in RA or SLE. Of all the HLA-DR beta chain paralogs, those encoded by HLA-DRB1 solely or dominantly influence susceptibility to RA and SLE.

  11. Imputing Variants in HLA-DR Beta Genes Reveals That HLA-DRB1 Is Solely Associated with Rheumatoid Arthritis and Systemic Lupus Erythematosus

    Science.gov (United States)

    Kim, Kwangwoo; Bang, So-Young; Yoo, Dae Hyun; Cho, Soo-Kyung; Choi, Chan-Bum; Sung, Yoon-Kyoung; Kim, Tae-Hwan; Jun, Jae-Bum; Kang, Young Mo; Suh, Chang-Hee; Shim, Seung-Cheol; Lee, Shin-Seok; Lee, Jisoo; Chung, Won Tae; Kim, Seong-Kyu; Choe, Jung-Yoon; Nath, Swapan K.; Lee, Hye-Soon; Bae, Sang-Cheol

    2016-01-01

    The genetic association of HLA-DRB1 with rheumatoid arthritis (RA) and systemic lupus erythematosus (SLE) is well documented, but association with other HLA-DR beta genes (HLA-DRB3, HLA-DRB4 and HLA-DRB5) has not been thoroughly studied, despite their similar functions and chromosomal positions. We examined variants in all functional HLA-DR beta genes in RA and SLE patients and controls, down to the amino-acid level, to better understand disease association with the HLA-DR locus. To this end, we improved an existing HLA reference panel to impute variants in all protein-coding HLA-DR beta genes. Using the reference panel, HLA variants were inferred from high-density SNP data of 9,271 RA-control subjects and 5,342 SLE-control subjects. Disease association tests were performed by logistic regression and log-likelihood ratio tests. After imputation using the newly constructed HLA reference panel and statistical analysis, we observed that HLA-DRB1 variants better accounted for the association between MHC and susceptibility to RA and SLE than did the other three HLA-DRB variants. Moreover, there were no secondary effects in HLA-DRB3, HLA-DRB4, or HLA-DRB5 in RA or SLE. Of all the HLA-DR beta chain paralogs, those encoded by HLA-DRB1 solely or dominantly influence susceptibility to RA and SLE. PMID:26919467

  12. Milder ovarian stimulation for in-vitro fertilization reduces aneuploidy in the human preimplantation embryo: A randomized controlled trial

    NARCIS (Netherlands)

    E.B. Baart (Esther); E. Martini (Elena); M.J.C. Eijkemans (René); D. van Opstal (Diane); N.G.M. Beckers (Nicole); A. Verhoeff (Arie); N.S. Macklon (Nick); B.C.J.M. Fauser (Bart)

    2007-01-01

    textabstractBACKGROUND: To test whether ovarian stimulation for in-vitro fertilization (IVF) affects oocyte quality and thus chromosome segregation behaviour during meiosis and early embryo development, preimplantation genetic screening of embryos was employed in a prospective, randomized controlled

  13. Solid phase testing in the HLA laboratory: implications for organ allocation.

    Science.gov (United States)

    Eckels, D D

    2008-08-01

    This piece was originally requested as a white paper from the Scientific and Clinical Affairs Committee of the American Society for Histocompatibility and Immunogenetics (ASHI), of which the author was then Chairman. Upon review by the ASHI Board of Directors and the Editors of their journal, it was considered too controversial for publication. It is intended to be provocative and controversial; it is not intended as a review of the literature. Though written with a decided 'American point of view', it is of importance that the issues facing US transplantation and laboratory testing efforts are shared to varying degrees by the international community, and who, unlike some of their American cousins, may be able to tolerate a spirited discussion. Sadly, we sometimes forget that dissent from dogma can be fun!

  14. HLA Typing for the Next Generation.

    Directory of Open Access Journals (Sweden)

    Neema P Mayor

    Full Text Available Allele-level resolution data at primary HLA typing is the ideal for most histocompatibility testing laboratories. Many high-throughput molecular HLA typing approaches are unable to determine the phase of observed DNA sequence polymorphisms, leading to ambiguous results. The use of higher resolution methods is often restricted due to cost and time limitations. Here we report on the feasibility of using Pacific Biosciences' Single Molecule Real-Time (SMRT DNA sequencing technology for high-resolution and high-throughput HLA typing. Seven DNA samples were typed for HLA-A, -B and -C. The results showed that SMRT DNA sequencing technology was able to generate sequences that spanned entire HLA Class I genes that allowed for accurate allele calling. Eight novel genomic HLA class I sequences were identified, four were novel alleles, three were confirmed as genomic sequence extensions and one corrected an existing genomic reference sequence. This method has the potential to revolutionize the field of HLA typing. The clinical impact of achieving this level of resolution HLA typing data is likely to considerable, particularly in applications such as organ and blood stem cell transplantation where matching donors and recipients for their HLA is of utmost importance.

  15. Application of preimplantation genetic diagnosis in equine blastocysts

    Directory of Open Access Journals (Sweden)

    Grady ST

    2016-08-01

    Full Text Available Pre-implantation genetic diagnosis (PGD is a procedure used to screen in vitroproduced embryos or embryos recovered after uterine flush to determine genetic traits by DNA testing prior to transfer into the uterus. Biopsy methods to obtain a sample of cells for genetic analysis before implantation have been successful in small embryos (morulae and blastocysts 300 µm diameter. The successful biopsy of expanded equine blastocysts via micromanipulation, with subsequent normal pregnancy rates, was first reported in 2010. Direct PCR may be performed when evaluating only one gene, such as for embryo sexing, while whole genome amplification is effective for subsequent multiplex PCR of multiple genes.

  16. Single Cell HLA Matching Feasibility by Whole Genomic Amplification and Nested PCR

    Institute of Scientific and Technical Information of China (English)

    Xiao-hong Li; Fang-yin Meng

    2004-01-01

    @@ PCR based single-cell DNA analysis has been widely used in forensic science, preimplantation genetic diagnosis and so on. However, the original sample cannot be efficiently retrieved following single cell PCR, consequently the amount of information gained is limited. HLA system is too sophisticated that it is very hard to complete HLA typing by single cell. A Taq polymerase-based method using random primers to amplify whole genome termed as whole genome amplification (WGA) has demonstrated to be a useful method in increasing the copies of minimum sample. We establish a technique in this study to amplify HLA-A and HLA-B loci at same time in a single cell using WGA.

  17. In vitro fertilization with preimplantation genetic screening

    NARCIS (Netherlands)

    Mastenbroek, Sebastiaan; Twisk, Moniek; van Echten-Arends, Jannie; Sikkema-Raddatz, Birgit; Korevaar, Johanna C.; Verhoeve, Harold R.; Vogel, Niels E. A.; Arts, Eus G. J. M.; de Vries, Jan W. A.; Bossuyt, Patrick M.; Buys, Charles H. C. M.; Heineman, Maas Jan; Repping, Sjoerd; van der Veen, Fulco

    2007-01-01

    BACKGROUND: Pregnancy rates in women of advanced maternal age undergoing in vitro fertilization (IVF) are disappointingly low. It has been suggested that the use of preimplantation genetic screening of cleavage-stage embryos for aneuploidies may improve the effectiveness of IVF in these women.

  18. Distribution of HLA-DRB1 and HLA-DQB1 alleles in Lak population of Iran.

    Science.gov (United States)

    Varzi, Ali Mohammad; Shahsavar, Farhad; Tarrahi, Mohammad Javad

    2016-07-01

    Human leukocyte antigen (HLA) genes are the most polymorphic loci in the human genome and encode the highly polymorphic molecules critically involved in immune responses. Anthropological studies based on highly polymorphic HLA genes provide useful information for bone marrow donor registry, forensic medicine, disease association studies, as well as designing peptide vaccines against tumors, and infectious or autoimmune diseases. The aim of this study was to determine the HLA-DRB1 and HLA-DQB1 allele frequencies in 100 unrelated Lak individuals from Lorestan province of Iran. Finally, we compared the results with those previously described in four other Iranian populations. Commercial HLA-Type kits were used for determination of the HLA-DRB1 and HLA-DQB1 allele frequencies. Differences between populations in the distribution of HLA-DRB1 and HLA-DQB1 alleles were estimated by χ2 test with Yate's correction and Fisher's exact test. The most frequent HLA-DRB1 alleles were (*)1103=4 (23%), (*)1502 (9.5%), (*)0701 (9%), (*)0301 (8.5%), (*)1101 (7.5%) and (*)1501 (6%) while HLA-DQB1(*)0301 (40%), (*)0201 (15%), (*)0502 (10.5%), (*)0303 (10%), (*)0602=3 (9.5%), and (*)0501 (7.5%) were the most frequent alleles in Lak population. HLA-DRB1(*)0409, (*)0804, (*)1102, (*)1112, (*)1405, and HLA-DQB1(*)0503, (*)0604 were the least observed frequencies in Lak population. Our results based on HLA-DRB1 and HLA-DQB1 allele frequencies showed that the Lak population possesses the previously reported general features of the Lur and Kurd populations but still with unique, decreased or increased frequencies of several alleles. In other words, the Lak population is close to Lurs Khorramabadi and Kurd but far from Lurs Kohkiloyeh/Boyerahmad and Bakhtiari.

  19. Preimplantation genetic diagnosis in the prevention of the haemoglobin disorders

    Directory of Open Access Journals (Sweden)

    S. Kahraman

    2011-12-01

    Full Text Available Preimplantation Genetic Diagnosis (PGD is currently an alternative for couples with high risk of pregnancies with genetic anomalies; it offers the possibility of avoiding the need to terminate affected pregnancies, since it allows the selection of unaffected embryos for transfer. PGD for inherited disorders has become extremely accurate (99.5%, and may currently be performed for any single gene disorders in which mutation is identified. PGD has been performed for more than 100 different conditions resulting in the birth of at least 1000 healthy children free of genetic disorder. PGD is presently also used together with preimplantation HLA typing for treatment of affected sibling with genetic and acquired disorders requiring HLA matched stem cell transplantation. This is not only to allow couples to have an unaffected child but also to select a potential donor progeny for stem cell transplantation. In Turkey, thalassemia is the most commonly seen genetic disorder the rate of thalassemia carriers is about 3 - 4% in Turkey. The majority of our PGD cases are thalassemia carriers. They do not only require thalassemia mutation analysis but also HLA typing for their affected child. In this study PGD results of 236 Turkish couples with or without HLA typing will be presented and discussed. A full diagnosis was achieved in 91.0% of the biopsied samples. In Group I, 17.8% of the analyzed embryos were found to be HLA compatible. HLA compatible and disease free embryos were 12.9% of all diagnosed embryos. In group II, 17.2% of embryos were found to be HLA matched and 71.4% HLA non-matched. The majority of our HLA typing combined with PGD cases were β-Thalassemia carriers (87.9%. The mutations analyzed have high heterogeneity, the most frequent mutation was IVS-I-110 G-A and comprised 46.2% of all mutations. To date, 70 healthy and HLA compatible children have been born. Twenty-five sick children have already been cured with cord blood cell and/or bone

  20. HLA-E polymorphism and soluble HLA-E plasma levels in chronic hepatitis B patients.

    Science.gov (United States)

    Zidi, I; Laaribi, A B; Bortolotti, D; Belhadj, M; Mehri, A; Yahia, H B; Babay, W; Chaouch, H; Zidi, N; Letaief, A; Yacoub, S; Boukadida, J; Di Luca, D; Hannachi, N; Rizzo, R

    2016-03-01

    Chronic hepatitis B virus (HBV) infection occurs in association to a deregulation of immune system. Human leukocyte antigen E (HLA-E) is an immune-tolerant nonclassical HLA class I molecule that could be involved in HBV progression. To measure soluble (s) HLA-E in patients with chronic HBV hepatitis (CHB). We tested the potential association of HLA-E*01:01/01:03 A > G gene polymorphism to CHB. Our cohort consisted of 93 Tunisian CHB patients (stratified in CHB with high HBV DNA levels and CHB with low HBV DNA levels) and 245 healthy donors. Plasma sHLA-E was determined using enzyme-linked immunosorbent assay (ELISA). Genotyping was performed using polymerase chain reaction sequence-specific primer. No association between HLA-E*01:01/01:03 A > G polymorphism and HBV DNA levels in CHB patients was found. G/G genotype is less frequent in CHB patients without significance. sHLA-E is significantly enhanced in CHB patients compared with healthy controls (P = 0.0017). Stratification according to HBV DNA levels showed that CHB patients with low HBV DNA levels have higher sHLA-E levels compared with CHB patients with high HBV DNA levels. CHB patients with G/G genotype have enhanced sHLA-E levels compared with other genotypes (P = 0.037). This significant difference is maintained only for CHB women concerning G/G genotypes (P = 0.042). Finally, we reported enhanced sHLA-E in CHB patients with advanced stages of fibrosis (P = 0.032). We demonstrate, for the first time, the association of sHLA-E to CHB. Owing to the positive correlation of HLA-E*01:01/01:03 A > G polymorphism and the association of sHLA-E to advanced fibrosis stages, HLA-E could be a powerful predictor for CHB progression. Further investigations will be required to substantiate HLA-E role as a putative clinical biomarker of CHB.

  1. ANALYZING HLA HAPLOTYPE OF THE LOCI HLA-A, -B, AND -DRB1 IN MONGOLIA ETHNIC GROUP

    Institute of Scientific and Technical Information of China (English)

    Zhang Hongbo; Li Shengbin

    2006-01-01

    Objective To investigate HLA-A,-B and -DRB1 allele and HLA-A-B-DRB1 haplotype frequencies in Mongolia ethnic group. Methods HLA-A, -B, -DRB1 allele and haplotype in the Mongolia ethnic group were investigated based on 93 individuals by PCR- sequence-based typing (SBT) method. Results Twenty-one alleles were detected for HLA-A, 44 for HLA-B, and 26 for HLA-DRB1. The most frequent alleles were HLA-A*2402(0.2097), HLA-B*1302(0.0699), and HLA-DRB1*0701(0.1237). The most common HLA-A-B-DRB1 haplotype were A*3001-B*1302-DRB1*0701, A*0101-B*3701-DRB1*1001, followed by the A*0201-B*4601-DRB1*0901, A*2402-B*4801-DRB1*1101, A*2402-B*5201-DRB1*1501, A*3201-B*3503-DRB1*1301, and A*3303-B*5801-DRB1*0301, which were also presented in Chinese populations. Conclusion The data can be used in forensic and paternity tests to estimate the frequency of a DNA profile or anthropologic research. The characteristics of the distribution of HLA alleles revealed that Mongolia ethnic group is characterized by northern Mongolian Chinese.

  2. [Custom-made medicine: preimplantation genetic diagnosis].

    Science.gov (United States)

    Sperling, Karl

    2006-01-01

    Who wants Preimplantation Genetic Diagnosis (PGD), who rejects it? The implications resulting from biological facts and legal regulations are addressed here. It is discussed under which conditions the restrictions of the Embryo Protection Act (Embryonenschutzgesetz, EschG) should be relaxed in order to be able to perform assisted reproduction technologies in Germany under international quality standards and also PGD in cases of stringent medical-genetic conditions.

  3. Identification of CD146 Expression in Human and Mouse Preimplantation Embryo

    Institute of Scientific and Technical Information of China (English)

    Hong-bo WANG; Xuan DU; Ya-hui XU; Ze-hua WANG

    2008-01-01

    Objective To investigate whether CD146, a cell adhesion molecule, is expressed in mouse and human preimplantation blastocysts and to localize CD146 in the layer of trophectoderm(TE) and/or inner cell mass(ICM). Methods Human and mouse embryos were collected. Using reverse transcription polymerase chain reaction(RT-PCR), the expression of CD146 mRNA in blastocyst was evaluated in human and mouse embryos. Single embryo immunohistochemical staining was applicated in the examination of the expression of CD146 in protein level. The statistical significance of the data was analyzed using t-test. Results CD146 transcript was detected in all human and mouse preimplantation morula and blastocyst. The expression of CD146 was found to localize in human and mouse compacted morula stage embryos and the TE and ICM of the expanded blastocysts. Conclusion mRNA and protein of CD146 was expressed in preimplantation embryos,which may have a profound influence on early preimplantation development for the differentiation of the trophectoderm and the morphogenesis of the blastocyst.Furthermore, the expression of CD146 in blastocyst stage may be implicated in the assistance of embryo implantation.

  4. Chromosomal mosaicism in human preimplantation embryos : a systematic review

    NARCIS (Netherlands)

    van Echten-Arends, Jannie; Mastenbroek, Sebastiaan; Sikkema-Raddatz, Birgit; Korevaar, Johanna C.; Heineman, Maas Jan; van der Veen, Fulco; Repping, Sjoerd

    2011-01-01

    BACKGROUND: Although chromosomal mosaicism in human preimplantation embryos has been described for almost two decades, its exact prevalence is still unknown. The prevalence of mosaicism is important in the context of preimplantation genetic screening in which the chromosomal status of an embryo is d

  5. Chromosomal mosaicism in human preimplantation embryos: a systematic review.

    NARCIS (Netherlands)

    Echten-Arends, J. van; Mastenbroek, S.; Sikkema-Raddatz, B.; Korevaar, J.C.; Heineman, M.J.; Veen, F. van der; Repping, S.

    2011-01-01

    BACKGROUND: Although chromosomal mosaicism in human preimplantation embryos has been described for almost two decades, its exact prevalence is still unknown. The prevalence of mosaicism is important in the context of preimplantation genetic screening in which the chromosomal status of an embryo is d

  6. Transcriptome profiling of human pre-implantation development.

    Directory of Open Access Journals (Sweden)

    Pu Zhang

    Full Text Available BACKGROUND: Preimplantation development is a crucial step in early human development. However, the molecular basis of human preimplantation development is not well known. METHODOLOGY: By applying microarray on 397 human oocytes and embryos at six developmental stages, we studied the transcription dynamics during human preimplantation development. PRINCIPAL FINDINGS: We found that the preimplantation development consisted of two main transitions: from metaphase-II oocyte to 4-cell embryo where mainly the maternal genes were expressed, and from 8-cell embryo to blastocyst with down-regulation of the maternal genes and up-regulation of embryonic genes. Human preimplantation development proved relatively autonomous. Genes predominantly expressed in oocytes and embryos are well conserved during evolution. SIGNIFICANCE: Our database and findings provide fundamental resources for understanding

  7. HLA antigens and asthma in Greeks.

    Science.gov (United States)

    Apostolakis, J; Toumbis, M; Konstantopoulos, K; Kamaroulias, D; Anagnostakis, J; Georgoulias, V; Fessas, P; Zervas, J

    1996-04-01

    HLA-A and -B antigens were determined in a group of 76 Greek asthmatic patients: 35 children (1.5-15 years) and 41 adults (18-73 years). The results were compared to those of 400 healthy unrelated controls from the same population. The standard NIH lymphocytotoxicity test was applied. When all 76 patients were compared to the controls, a statistically significant lower frequency of HLA-B5 and -B35 antigens was noted. When adults were analysed alone, an increased frequency of HLA-B8 was found. On the other hand, in the asthmatic children sub-group, the HLA-A10 antigen was significantly higher and the HLA-B5 was significantly lower than in the controls. These data imply that different HLA antigens may be involved in the pathogenesis of several clinical forms of asthma and that, in order to study the role of immunogenetic factor(s) in the pathogenesis of this disease, more adequate grouping criteria are needed.

  8. Recognition of a polymorphic monocyte antigen in HLA.

    Science.gov (United States)

    van Leeuwen, A; Termijtelen, A; Shaw, S; van Rood, J J

    1982-08-05

    The serological recognition of 'new' gene products of the HLA system can be accomplished by selecting sera with strong leucocyte antibodies and testing these against a panel of cells obtained from donors which are compatible for the known HLA antigens with the antibody producer. This approach, which we termed the HLA-CAP approach (compatible with antibody producer), was essential in the recognition of what is now called the HLA-DR locus and of non HLA-linked T-cell subgroups. Using the same technique, we have defined here several sera recognizing a structure on monocytes similar to one of the alleles of the HLA-linked PL3 or secondary B-cell (SB) system, so far only recognized by cellular techniques.

  9. Intra HLA-D/DR region recombinant detected by primed lymphocyte typing (PLT)

    DEFF Research Database (Denmark)

    Jakobsen, B K; Kristensen, T; Lamm, L U

    1983-01-01

    The chromosome 6 markers, HLA-ABC, D, DR, MT, properdin factor Bf, and complement factors 2 (C2) and 5 (C4), were studied in three families, each of which included two HLA identical siblings, one or both of whom were known to be HLA-B: GLO recombinants. The families were also typed with primed...... lymphocyte typing (PLT) for HLA-D/DR region associated DP antigens. None of these studies gave evidence that the recombinations had occurred within the HLA region. Mixed leucocyte culture (MLC) tests within the families showed no detectable stimulation between the HLA identical siblings in two...

  10. Christian lay understandings of preimplantation genetic diagnosis.

    Science.gov (United States)

    Doolin, Bill; Motion, Judy

    2010-11-01

    Focus groups were used to analyse Christian lay public understanding of preimplantation genetic diagnosis (PGD), a relatively new biomedical practice. The paper explores how this often controversial genetic technology was contextualised and interpreted through the intersection of religious values and beliefs, secular and cultural knowledges, and lived experience and emotion. For the lay people in our study, PGD often created moral dilemmas that could not necessarily be resolved through Christian beliefs and teaching, but which required the expression of empathy and compassion. The findings emphasise the heterogeneity in individuals' interpretations of scientific issues and reinforce the need to consider public understanding of science and technology in terms of public concerns and meaning.

  11. HLA-matched embryos selected for siblings requiring haematopoietic stem cell transplantation: a psychological perspective.

    Science.gov (United States)

    Baetens, P; Van de Velde, H; Camus, M; Pennings, G; van Steirteghem, A; Devroey, P; Liebaers, I

    2005-02-01

    Allogeneic haematopoietic stem cell transplantation (HSCT) is a treatment for a number of acquired and congenital diseases. An important factor in the outcome of the treatment is the degree of human leukocyte antigen (HLA) compatibility between patient and donor. HLA identical siblings therefore provide the best chance for the recipient. Preimplantation genetic diagnosis (PGD) can be used to select HLA identical embryos if there is no HLA compatible sibling in the family. The Centre for Reproductive Medicine considered it morally justified to give medical assistance to couples in need of an HLA matched sibling. Two considerations played an important role in this respect: (i) the use as a donor should not be the only parents' motive for having the child and (ii) IVF and HLA typing on the embryos would be less of a burden for the parents than other alternatives. Since the first request in 2000, 12 couples have been referred for psychological counselling. The motivation of four couples will be discussed in depth. The validity of the arguments will be checked against the experience of the actual cases. The consequences of the treatment on the welfare of the future donor child will be discussed.

  12. Interaction between HLA-B60 and HLA-B27 as a Better Predictor of Ankylosing Spondylitis in a Taiwanese Population.

    Directory of Open Access Journals (Sweden)

    James Cheng-Chung Wei

    Full Text Available Ankylosing spondylitis (AS is a form of chronic inflammatory spondyloarthritis (SpA that causes pain and stiffness in spines or joints. Human leukocyte antigen B27 (HLA-B27 and B60 (HLA-B60 have been reported as major genetic risk factors of AS. In addition, rs13202464, located on major histocompatibility complex (MHC region, showed high sensitivity (98.7% and specificity (98.0% for HLA-B27.The aim of our study is to test whether the interaction between HLA-B60 and HLA-B27 (rs13202464 can serve as a better predictor of AS. We have genotyped HLA-B60 and rs13202464 among 471 patients with AS and 557 healthy subjects. Combined risk factors were investigated to test the biological interaction.Our results indicated that the relative risk (RR for HLA-B27+/HLA-B60- was 152 (95% CI 91 to 255 and it increased to 201 (95% CI 85 to 475 in HLA-B27+/HLA-B60+ patients (with HLA-B27-/HLA-B60- as reference. Combinational analysis of two risk factors (HLA-B27+/HLA-B60+ showed a relative excess risk due to interaction (RERI of 46.79 (95% CI: -117.58 to 211.16, attributable proportion (AP of 0.23 (95% CI: -0.41 to 0.88 and a synergy index (S of 1.31 (95% CI: 0.56 to 3.04.In conclusion, genetic interaction analysis revealed that the interaction between HLA-B60 and HLA-B27 is a better marker for the risk of AS susceptibility in a Taiwanese population.

  13. Sex determination of bovine preimplantation embryos by oligonucleotide microarray.

    Science.gov (United States)

    Yang, Hua; Zhong, Fagang; Yang, Yonglin; Wang, Xinhua; Liu, Shouren; Zhu, Bin

    2013-06-01

    The aim has been to set up a rapid and accurate microarray assay using sandwich mode for sex determination of bovine preimplantation embryos. Twelve sequence-specific oligonucleotide capture probes used to discriminate 12 samples were spotted onto the aldehyde-modified glass slides by Arrayer. The 2 recognition probes used to identify coding regions of the sex-determining region of the Y chromosome gene (SRY) and β-casein (CSN2) reference gene were coupled with biotin. The assay was optimized by using genomic DNA extracted from blood samples of known sex individuals. Polymerase chain reaction (PCR) was used to amplify the fragments in the HMG box region of SRY gene and CSN2 gene with sequence-specific primers. The sex of samples was identified by detecting both the SRY and CSN2 genes simultaneously in 2 reaction cells of microarrays, with the male having SRY and CSN2 signals and the female only CSN2. The sex of 20 bovine preimplantation embryos was determined by oligonucleotide microarray. The protocol was run with a blind test that showed a 100% (82/82) specificity and accuracy in sexing of leukocytes. The bovine embryos were transferred into 20 bovine recipients, with a pregnant rate of 40% (8/20). Three calves were born at term, and 5 fetuses were miscarried. Their sexes were fully in accordance with the embryonic sex predetermination predicted by oligonucleotide microarray. This suggests that the oligonucleotide microarray method of SRY gene analysis can be used in early sex prediction of bovine embryos in breeding programs.

  14. The Impact of Biopsy on Human Embryo Developmental Potential during Preimplantation Genetic Diagnosis

    OpenAIRE

    Danilo Cimadomo; Antonio Capalbo; Filippo Maria Ubaldi; Catello Scarica; Antonio Palagiano; Rita Canipari; Laura Rienzi

    2016-01-01

    Preimplantation Genetic Diagnosis and Screening (PGD/PGS) for monogenic diseases and/or numerical/structural chromosomal abnormalities is a tool for embryo testing aimed at identifying nonaffected and/or euploid embryos in a cohort produced during an IVF cycle. A critical aspect of this technology is the potential detrimental effect that the biopsy itself can have upon the embryo. Different embryo biopsy strategies have been proposed. Cleavage stage blastomere biopsy still represents the most...

  15. Technical Update: Preimplantation Genetic Diagnosis and Screening.

    Science.gov (United States)

    Dahdouh, Elias M; Balayla, Jacques; Audibert, François; Wilson, R Douglas; Audibert, François; Brock, Jo-Ann; Campagnolo, Carla; Carroll, June; Chong, Karen; Gagnon, Alain; Johnson, Jo-Ann; MacDonald, William; Okun, Nanette; Pastuck, Melanie; Vallée-Pouliot, Karine

    2015-05-01

    Objectif : Mettre à jour et passer en revue les techniques et les indications du diagnostic génétique préimplantatoire et du dépistage génétique préimplantatoire. Options : Discussion au sujet des aspects techniques et génétiques des techniques génésiques préimplantatoires, particulièrement en ce qui concerne celles qui font appel aux nouvelles technologies cytogénétiques et à la biopsie au stade de l’embryon. Issues : Les issues cliniques obtenues par les techniques génésiques à la suite du recours au diagnostic génétique préimplantatoire et au dépistage génétique préimplantatoire sont incluses. La présente mise à jour ne traite pas en détail des issues indésirables qui ont été signalées en association avec les technologies de procréation assistée. Résultats : La littérature publiée a été récupérée par l’intermédiaire de recherches menées dans Medline et The Cochrane Library en avril 2014 au moyen d’un vocabulaire contrôlé (« aneuploidy », « blastocyst/physiology », « genetic diseases », « preimplantation diagnosis/methods », « fertilization in vitro ») et de mots clés (p. ex. « preimplantation genetic diagnosis », « preimplantation genetic screening », « comprehensive chromosome screening », « aCGH », « SNP microarray », « qPCR » et « embryo selection ») appropriés. Les résultats ont été restreints aux analyses systématiques, aux études observationnelles et aux essais comparatifs randomisés / essais cliniques comparatifs publiés en anglais entre 1990 et avril 2014. Aucune restriction n’a été imposée en matière de langue. Les recherches ont été mises à jour de façon régulière et intégrées à la directive clinique jusqu’en janvier 2015. Des publications additionnelles ont été identifiées à partir des bibliographies des articles récupérés. La littérature grise (non publiée) a été identifiée par l’intermédiaire de

  16. Understanding of HLA-conferred susceptibility to chronic hepatitis B infection requires HLA genotyping-based association analysis

    Science.gov (United States)

    Nishida, Nao; Ohashi, Jun; Khor, Seik-Soon; Sugiyama, Masaya; Tsuchiura, Takayo; Sawai, Hiromi; Hino, Keisuke; Honda, Masao; Kaneko, Shuichi; Yatsuhashi, Hiroshi; Yokosuka, Osamu; Koike, Kazuhiko; Kurosaki, Masayuki; Izumi, Namiki; Korenaga, Masaaki; Kang, Jong-Hon; Tanaka, Eiji; Taketomi, Akinobu; Eguchi, Yuichiro; Sakamoto, Naoya; Yamamoto, Kazuhide; Tamori, Akihiro; Sakaida, Isao; Hige, Shuhei; Itoh, Yoshito; Mochida, Satoshi; Mita, Eiji; Takikawa, Yasuhiro; Ide, Tatsuya; Hiasa, Yoichi; Kojima, Hiroto; Yamamoto, Ken; Nakamura, Minoru; Saji, Hiroh; Sasazuki, Takehiko; Kanto, Tatsuya; Tokunaga, Katsushi; Mizokami, Masashi

    2016-01-01

    Associations of variants located in the HLA class II region with chronic hepatitis B (CHB) infection have been identified in Asian populations. Here, HLA imputation method was applied to determine HLA alleles using genome-wide SNP typing data of 1,975 Japanese individuals (1,033 HBV patients and 942 healthy controls). Together with data of an additional 1,481 Japanese healthy controls, association tests of six HLA loci including HLA-A, C, B, DRB1, DQB1, and DPB1, were performed. Although the strongest association was detected at a SNP located in the HLA-DP locus in a SNP-based GWAS using data from the 1,975 Japanese individuals, HLA genotyping-based analysis identified DQB1*06:01 as having the strongest association, showing a greater association with CHB susceptibility (OR = 1.76, P = 6.57 × 10−18) than any one of five HLA-DPB1 alleles that were previously reported as CHB susceptibility alleles. Moreover, HLA haplotype analysis showed that, among the five previously reported HLA-DPB1 susceptibility and protective alleles, the association of two DPB1 alleles (DPB1*09:01, and *04:01) had come from linkage disequilibrium with HLA-DR-DQ haplotypes, DRB1*15:02-DQB1*06:01 and DRB1*13:02-DQB1*06:04, respectively. The present study showed an example that SNP-based GWAS does not necessarily detect the primary susceptibility locus in the HLA region. PMID:27091392

  17. Whole Genome Amplification of Day 3 or Day 5 Human Embryos Biopsies Provides a Suitable DNA Template for PCR-Based Techniques for Genotyping, a Complement of Preimplantation Genetic Testing

    Directory of Open Access Journals (Sweden)

    Elizabeth Schaeffer

    2017-01-01

    Full Text Available Our objective was to determine if whole genome amplification (WGA provides suitable DNA for qPCR-based genotyping for human embryos. Single blastomeres (Day 3 or trophoblastic cells (Day 5 were isolated from 342 embryos for WGA. Comparative Genomic Hybridization determined embryo sex as well as Trisomy 18 or Trisomy 21. To determine the embryo’s sex, qPCR melting curve analysis for SRY and DYS14 was used. Logistic regression indicated a 4.4%, 57.1%, or 98.8% probability of a male embryo when neither gene, SRY only, or both genes were detected, respectively (accuracy = 94.1%, kappa = 0.882, and p<0.001. Fluorescent Capillary Electrophoresis for the amelogenin genes (AMEL was also used to determine sex. AMELY peak’s height was higher and this peak’s presence was highly predictive of male embryos (AUC = 0.93, accuracy = 81.7%, kappa = 0.974, and p<0.001. Trisomy 18 and Trisomy 21 were determined using the threshold cycle difference for RPL17 and TTC3, respectively, which were significantly lower in the corresponding embryos. The Ct difference for TTC3 specifically determined Trisomy 21 (AUC = 0.89 and RPL17 for Trisomy 18 (AUC = 0.94. Here, WGA provides adequate DNA for PCR-based techniques for preimplantation genotyping.

  18. The role of HLA antibodies in allogeneic SCT: is the 'type-and-screen' strategy necessary not only for blood type but also for HLA?

    Science.gov (United States)

    Yoshihara, S; Taniguchi, K; Ogawa, H; Saji, H

    2012-12-01

    The role of HLA antibodies in SCT has drawn increasing attention because of the significantly increased number of patients who receive HLA-mismatched SCT, including cord blood transplantation, haploidentical SCT and unrelated SCT. Technical advancements in the methods of HLA Ab testing have realized rapid, accurate and objective identification, as well as quantification of specific HLA antibodies. Recent clinical studies have suggested that the presence of donor-specific HLA antibodies (DSA) in patients is associated with graft failure in HLA-mismatched SCT when the above-listed stem cell sources are used and results in different impacts. Of note, most of the 'HLA-matched' unrelated SCT actually involve HLA mismatches in HLA-DP and the presence of antibodies against this locus has been reported to be associated with graft failure. Thus, HLA Ab should be examined as a work-up for all patients who undergo SCT from 'alternative donors.' The simplest route for preventing HLA Ab-mediated graft failure in Ab-positive patients is to avoid donors who possess the target Ag of HLA antibodies. If SCT from such donors must be performed, treatment for DSA before SCT may improve the chances of successful donor engraftment.

  19. Milder ovarian stimulation for in-vitro fertilization reduces aneuploidy in the human preimplantation embryo : a randomized controlled trial

    NARCIS (Netherlands)

    Baart, Esther B.; Martini, Elena; Eijkemans, Marinus J.; Van Opstal, Diane; Beckers, Nicole G. M.; Verhoeff, Arie; Macklon, Nicolas S.; Fauser, Bart C. J. M.

    2007-01-01

    To test whether ovarian stimulation for in-vitro fertilization (IVF) affects oocyte quality and thus chromosome segregation behaviour during meiosis and early embryo development, preimplantation genetic screening of embryos was employed in a prospective, randomized controlled trial, comparing two ov

  20. A simplified method for screening siblings for HLA identity using short tandem repeat (STR) polymorphisms.

    Science.gov (United States)

    Schiller, Jennifer J; Hopp, Kathleen A; Pietz, Bradley C; Bick, David P; Lau, Eduardo C; Ellis, Thomas M

    2013-05-01

    Identifying an HLA-matched sibling donor for hematopoietic stem cell transplantation (HSCT) is time-consuming and expensive, and often limited by reimbursement caps imposed by insurance providers. To improve the effectiveness and efficiency of screening for HLA-matched siblings, we developed an assay for determining HLA identity using a panel of nine informative short tandem repeat (STR) loci located throughout the HLA complex. The STR panel was assessed for accuracy in identifying HLA-matched siblings in 88 family workups comprising a total of 132 related donor and recipient typing comparisons. All sibling pairs with identical STR alleles were also HLA identical. Of the 48 pairs mismatched at one or more STR alleles, all were genotypically HLA non-identical at one or more loci. The sensitivity and specificity of STR analysis for identifying HLA-matched siblings were 91% and 100%, respectively. Three false negatives occurred due to an STR mutation or possible HLA-DPB1/DQB1 recombination. Additionally, STR genotyping provided additional information allowing determination of the extent of HLA identity in families where HLA haplotype inheritance was ambiguous, due to extensive homozygosity or shared parental haplotypes. The HLA STR assay is a reliable and rapid test that can be used to inexpensively screen potential sibling donors for HLA identity.

  1. HLA II class antigens and susceptibility to coeliac disease

    Directory of Open Access Journals (Sweden)

    Vojvodić Svetlana

    2011-01-01

    Full Text Available Coeliac disease (CD is a systemic autoimmune, complex and multifactorial disorder, which is caused by interactions between genetic and environmental factors. The only established genetic risk factors so far are the human leucocyte antigens. The aim of this study was to assess the distribution of II class human leukocyte antigens (HLA in patients with coeliac disease and to investigate the susceptibility to coeliac disease in family members. We typed HLA DR and DQ antigens in 37 patients from Vojvodina with coeliac disease, 23 first-degree relatives, and 210 controls, serologically using standard lymphocytotoxicity technique. HLA DQ5(1, DQ6(1, DR11(5, DQ7(3, DQ2 and DR15(2 were the most common antigens in the control group. Frequency of HLA DQ2, DR3 and DR7 was higher in CD patients than in the control group. The relative risks for HLA DQ2, DR3 and DR7 were 4.846, 6.986 and 2.106, respectively, while positive association was found between HLA DQ2 and DR3 and CD. Frequency of HLA DQ2, DR3 and DR16(2 was higher in first-degree relatives than in the control group while a positive association was found between HLA DQ2 and DR3. A negative association was found between HLA DQ5(1 and DQ6(1 in coeliac patients from Vojvodina and their relatives, in addition to HLA DR11(5 in the group of relatives (RR=0.363,PF=0.232. These findings indicate the impact of the HLA testing for CD in clinical practice in order to rule out the possibility to CD in doubtful cases or in at-risk subjects.

  2. Preimplantation embryo programming: transcription, epigenetics, and culture environment.

    Science.gov (United States)

    Duranthon, Veronique; Watson, Andrew J; Lonergan, Patrick

    2008-02-01

    Preimplantation development directs the formation of an implantation- or attachment-competent embryo so that metabolic interactions with the uterus can occur, pregnancy can be initiated, and fetal development can be sustained. The preimplantation embryo exhibits a form of autonomous development fueled by products provided by the oocyte and also from activation of the embryo's genome. Despite this autonomy, the preimplantation embryo is highly influenced by factors in the external environment and in extreme situations, such as those presented by embryo culture or nuclear transfer, the ability of the embryo to adapt to the changing environmental conditions or chromatin to become reprogrammed can exceed its own adaptive capacity, resulting in aberrant embryonic development. Nuclear transfer or embryo culture-induced influences not only affect implantation and establishment of pregnancy but also can extend to fetal and postnatal development and affect susceptibility to disease in later life. It is therefore critical to define the basic program controlling preimplantation development, and also to utilize nuclear transfer and embryo culture models so that we may design healthier environments for preimplantation embryos to thrive in and also minimize the potential for negative consequences during pregnancy and post-gestational life. In addition, it is necessary to couple gene expression analysis with the investigation of gene function so that effects on gene expression can be fully understood. The purpose of this short review is to highlight our knowledge of the mechanisms controlling preimplantation development and report how those mechanisms may be influenced by nuclear transfer and embryo culture.

  3. Platelet transfusion refractoriness attributable to HLA antibodies produced by donor-derived cells after allogeneic bone marrow transplantation from one HLA-antigen-mismatched mother.

    Science.gov (United States)

    Hatakeyama, Naoki; Hori, Tsukasa; Yamamoto, Masaki; Inazawa, Natsuko; Iesato, Kotoe; Miyazaki, Toru; Ikeda, Hisami; Tsutsumi, Hiroyuki; Suzuki, Nobuhiro

    2011-12-01

    PTR is a serious problem in patients being treated for hematologic disorders. Two patients with acute leukemia developed PTR after allogeneic BMT from one HLA-antigen-mismatched mother attributable to HLA antibodies, which could not be detected in their serum before BMT. HLA antibodies, whose specificity resembled that of each patient, were detected in each donor's serum. Each donor had probably been immunized during pregnancy by their partner's HLA antigens expressed by the fetus, consequently, transplanted donor-derived cells provoked HLA antibodies in each recipient early after BMT, and those HLA antibodies induced PTR. If the mothers are selected as donors for their children, they should be tested for the presence of HLA antibodies. © 2010 John Wiley & Sons A/S.

  4. An HLA matched donor! An HLA matched donor? What do you mean by: HLA matched donor?

    Science.gov (United States)

    van Rood, J J; Oudshoorn, M

    1998-07-01

    The term 'an HLA matched donor' is in general used without giving exact information on the level of resolution of the HLA typing. This can lead to misunderstandings. A proposal is formulated to agree on using six match categories according to the HLA typing technique used to indicate the level of confidence of the matching.

  5. Preimplantation diagnosis: efficient tool for human leukocyte antigen matched bone marrow transplantation for thalassemia

    Directory of Open Access Journals (Sweden)

    Anver Kuliev

    2011-08-01

    Full Text Available Thalassemia is among the most frequent indications for preimplantation genetic diagnosis (PGD to allow at risk couples reproducing without fear of having an affected child. In addition, those already having the affected child, have also the option to produce an unaffected offspring that may be also a complete human leukocyte antigen (HLA match to affected child to ensure successful bone marrow transplantation. We present here the results of retrospective analysis of 293 PGD cycles for thalassemia, including 144cases of simultaneous HLA typing, resulting in birth of 70 thalassemia-free children and 12 unaffected HLA matched ones, providing their cord blood and/or bone marrow for transplantation treatment of their affected siblings. The present overall experience includes successful cord blood or bone marrow transplantation in more than three dozens of cases with HLA matched stem cells obtained from children born after PGD, demonstrating that PGD is an efficient approach for improving success of bone marrow transplantation treatment for thalassemia.   植入前遗传学诊断(PGD)是地中海贫血(地贫)最常用的疗法,该病患者夫妇无须担心孕儿受到感染。此外,如果已经怀上受到感染的宝宝,他们也可有选择性再生育一个未受感染的后代,提供完全匹配的HLA,来确保骨髓成功移植。本文将提供293个地贫病例的PGD周期诊断结果,包括144例HLA同时配型,有70例宝宝无地贫出生和12例未受感染的HLA配型宝宝出生。将这些健康宝宝的脐带血和/或骨髓取出以完成对他们同胞的移植手术,通过使用经诊断后的,出生宝宝身上取出的HLA配型干细胞,成功完成36例宝宝的脐带或骨髓移植手术。结果表明PGD能有效提高地贫患儿骨髓移植手术的成功率。

  6. Factors affecting the gene expression of in vitro cultured human preimplantation embryos

    NARCIS (Netherlands)

    Mantikou, E.; Jonker, M.J.; Wong, K.M.; van Montfoort, A.P.A.; de Jong, M.; Breit, T.M.; Repping, S.; Mastenbroek, S.

    2016-01-01

    STUDY QUESTION: What is the relative effect of common environmental and biological factors on transcriptome changes during human preimplantation development? SUMMARY ANSWER: Developmental stage and maternal age had a larger effect on the global gene expression profile of human preimplantation

  7. Is there a relationship between narcolepsy, multiple sclerosis and HLA-DQB1*06:02?

    Science.gov (United States)

    Lorenzoni, Paulo José; Werneck, Lineu Cesar; Crippa, Ana Christina de Souza; Zanatta, Alessandra; Kay, Cláudia S Kamoi; Silvado, Carlos Eduardo S; Scola, Rosana Herminia

    2017-06-01

    We studied multiple sclerosis (MS) patients with the HLA-DQB1*06:02 allele and compared them with MS patients who did not carry the HLA-DQB1*06:02 allele. We analyzed clinical and neurophysiological criteria for narcolepsy in six MS patients with HLA-DQB1*06:02, compared with 12 MS patients who were HLA-DQB1*06:02 non-carriers. Only two patients with HLA-DQB1*06:02 allele scored higher than 10 on the Epworth Sleepiness Scale. Polysomnography recording parameters and the multiple sleep latency test showed an absence of narcolepsy in the study group. Our study suggested no significant correlation between narcolepsy, MS and HLA-DQB1*06:02. The HLA-DQB1*06:02 allele alone was not sufficient to cause MS patients to develop narcolepsy.

  8. Sex and the preimplantation embryo: implications of sexual dimorphism in the preimplantation period for maternal programming of embryonic development.

    Science.gov (United States)

    Hansen, Peter J; Dobbs, Kyle B; Denicol, Anna C; Siqueira, Luiz G B

    2016-01-01

    The developmental program of the embryo displays a plasticity that can result in long-acting effects that extend into postnatal life. In mammals, adult phenotype can be altered by changes in the maternal environment during the preimplantation period. One characteristic of developmental programming during this time is that the change in adult phenotype is often different for female offspring than for male offspring. In this paper, we propose the hypothesis that sexual dimorphism in preimplantation programming is mediated, at least in part, by sex-specific responses of embryos to maternal regulatory molecules whose secretion is dependent on the maternal environment. The strongest evidence for this idea comes from the study of colony-stimulating factor 2 (CSF2). Expression of CSF2 from the oviduct and endometrium is modified by environmental factors of the mother, in particular seminal plasma and obesity. Additionally, CSF2 alters several properties of the preimplantation embryo and has been shown to alleviate negative consequences of culture of mouse embryos on postnatal phenotype in a sex-dependent manner. In cattle, exposure of preimplantation bovine embryos to CSF2 causes sex-specific changes in gene expression, interferon-τ secretion and DNA methylation later in pregnancy (day 15 of gestation). It is likely that several embryokines can alter postnatal phenotype through actions directed towards the preimplantation embryo. Identification of these molecules and elucidation of the mechanisms by which sexually-disparate programming is established will lead to new insights into the control and manipulation of embryonic development.

  9. A PRIMARY STUDY OF THE CORRELASTIONS BETWEEN HUMAN LEUKOCYTE ANTIGEN (HLA)AND OSTEOSARCOMA

    Institute of Scientific and Technical Information of China (English)

    Zhang Weibin; Luo Jiong; Shen Caiwei; Cai Tidong; Yang Yuqin; Yao Fangjuan; Fan LiAn

    1998-01-01

    Objective: To study the correlations between human leukocyte antigen (HLA) and osteosarcoma in Chinese Han nationality. Methods: The frequencies of HLA-A, B,DR, DQ locus antigens were tested in a group of 25osteosarcoma patients in comparison with 250 healthy controls by using complement-dependent microlymphocytotoxity technique. Both of them are Chinese Han nationality. The results were compared statistically.Results: The frequency of HLA-B35 was 0.400 in patient group, and comparing with 0.048 in controls. The relative risk of suffering from osteosarcoma in persons carrying HLA-B35 was 13.220 times as high as that in those without this antigen (P<0.01). Patients with HLA-B13 had increased in the relative risk of poor prognosis with 12.048 fold comparing with those without this antigen (P<0.05). A tendency of the worst prognosis was presented in the patients who carry both HLA-B13 and HLA-B35.For those patients with HLA-B40, the relative safety was 7.057 times higher than the negative persons (P<0.05).Conclusion: HLA-B35 is in close linkage to osteosarcoma susceptibility genes in Chinese Han nationality. HLA-B13and HLA-B40 may be associated to the malignant and resistant genes of osteosarcoma respectively.

  10. REPORT OF HLA DISTRIBUTION IN 2315 VOLUNTEER DONORS OF CHINESE BONE MARROW BANK FROM NORTHWEST CHINA

    Institute of Scientific and Technical Information of China (English)

    Jin Tianbo; Gao Ya; Zhang Hongbo; Zhao Junhai; Lai Jianghua; Lai Shuping; Li Shengbin

    2005-01-01

    Objective To report the HLA data of volunteer donors of Chinese bank from Northwest China and characterize the distribution of HLA genes in Northwest China. Methods HLA-A, B antigens of 2315 volunteer donors were examined by the method of microlymphocytetoxicity (MLT) test .The antigen frequencies(AF) were assessed by directly counting; and based on that gene frequencies(GF) were calculated. HLA data from other population were collected and distribution characteristics were compared. With the raw data, Hardy-Weinberg equilibrium, statistical parameters of forensic medicine interest for HLA were computed. Results A total of 18 specific antigens were detected in HLA-A and the most frequent antigen was A2 . AF and GF were 0.5136 and 0.3026, respectively. A total of 42 specific antigens were detected in HLA-B and the most frequent antigen was A13. Its AF and GF were 0.1978 and 0.1044, respectively. The heterozygosity(H), polymorphism information content(PIC), discrimination power(DP) and probability of paternity exclusion (PPE) of HLA-A were 0.8215, 0.8212, 0.9356 and 0.7798 accordingly; while H,PIC, DP and PPE of HLA-B were 0.9322, 0.9322, 0.9878 and 0.9528. Conclusion The polymorphism of HLA-A,B genes is characteristic in Chinese. In this research, the genetic trait of HLA in 2315 volunteers is consistent with Northern Han population.

  11. Genetically engineered blood pharming: generation of HLA-universal platelets derived from CD34+ progenitor cells.

    Science.gov (United States)

    Figueiredo, Constança; Blaszczyk, Rainer

    2014-01-01

    Blood pharming is a recently designed concept to enable in vitro production of blood cells that are safe, effective and readily available. This approach represents an alternative to blood donation and may contribute to overcome the shortage of blood products. However, the high variability of the human leukocyte antigen (HLA) loci remains a major hurdle to the application of off-the-shelf blood products. Refractoriness to platelet (PLT) transfusion caused by alloimmunization against HLA class I antigens constitutes a relevant clinical problem. Thus, it would be desirable to generate PLT units devoid of HLA antigens. To reduce the immunogenicity of cell-based therapeutics, we have permanently reduced HLA class I expression using an RNA interference strategy. Furthermore, we demonstrated that the generation of HLA class I-silenced (HLA-universal) PLTs from CD34+ progenitor cells using an shRNA targeting β2-microglobulin transcripts is feasible. CD34+ progenitor cells derived from G-CSF mobilised donors were transduced with a lentiviral vector encoding for the β2-microglobulin-specific shRNA and differentiated into PLTs using a liquid culture system. The functionality of HLA-silenced PLTs and their ability to escape HLA antibody-mediated cytotoxicity were evaluated in vitro and in vivo. Platelet activation in response to ADP and thrombin were assessed in vitro. The immune-evasion capability of HLA-universal megakaryocytes (MKs) and PLTs was tested in lymphocytotoxicity assays using anti-HLA antibodies. To assess the functionality of HLA-universal PLTs in vivo, HLA-silenced MKs were infused into NOD/SCID/IL-2Rγc(-/-) mice with or without anti-HLA antibodies. PLT generation was evaluated by flow cytometry using anti-CD42a and CD61 antibodies. HLA-universal PLTs demonstrated to be functionally similar to blood-derived PLTs. Lymphocytotoxicity assays showed that HLA-silencing efficiently protects MKs against HLA antibody-mediated complement-dependent cytotoxicity. 80

  12. A growth factor phenotype map for ovine preimplantation development.

    Science.gov (United States)

    Watson, A J; Watson, P H; Arcellana-Panlilio, M; Warnes, D; Walker, S K; Schultz, G A; Armstrong, D T; Seamark, R F

    1994-04-01

    The reverse transcription-polymerase chain reaction (RT-PCR) was used to determine the patterns of expression for several growth factor ligand and receptor genes during ovine preimplantation development. Transcripts for insulin-like growth factor (IGF)-I, IGF-II, and the receptors for insulin and IGF-I were detected throughout ovine preimplantation development from the 1-cell to the blastocyst stage. Transforming growth factor alpha (TGF alpha) transcripts were also detected throughout ovine preimplantation development. The mRNAs encoding basic fibroblast growth factor (bFGF) were detected in all stages of the ovine preimplantation embryo, although the relative abundance of this transcript consistently decreased from the 1-cell to the blastocyst stage, suggesting that it may represent a maternal transcript in early sheep embryos. Transcripts encoding ovine trophoblast protein (oTP) were detected only within blastocyst-stage embryos. Primary ovine oviduct cell cultures express the transcripts for IGF-II, IGF-I, TGF alpha, bFGF, TGF beta 1, and the receptors for insulin and IGF-I, suggesting that paracrine growth factor circuits may exist between the oviduct epithelium and the early ovine embryo. Transcripts for insulin, epidermal growth factor (EGF), and nerve growth factor (NGF) were not detected in any stage of the ovine preimplantation embryo or within the oviduct cell preparations. The expression of growth factor transcripts very early in mammalian development would predict that these molecules fulfil a necessary role(s) in supporting the progression of early embryos through the preimplantation interval. Our future efforts will be directed to understanding the nature of these putative regulatory pathways.

  13. Plasma levels of soluble HLA-E and HLA-F at diagnosis may predict overall survival of neuroblastoma patients.

    Science.gov (United States)

    Morandi, Fabio; Cangemi, Giuliana; Barco, Sebastiano; Amoroso, Loredana; Giuliano, Maria; Gigliotti, Anna Rita; Pistoia, Vito; Corrias, Maria Valeria

    2013-01-01

    The purpose of this study was to identify the plasma/serum biomarkers that are able to predict overall survival (OS) of neuroblastoma (NB) patients. Concentration of soluble (s) biomarkers was evaluated in plasma (sHLA-E, sHLA-F, chromogranin, and B7H3) or serum (calprotectin) samples from NB patients or healthy children. The levels of biomarkers that were significantly higher in NB patients were then analyzed considering localized or metastatic subsets. Finally, biomarkers that were significantly different in these two subsets were correlated with patient's outcome. With the exception of B7H3, levels of all molecules were significantly higher in NB patients than those in controls. However, only chromogranin, sHLA-E, and sHLA-F levels were different between patients with metastatic and localized tumors. sHLA-E and -F levels correlated with each other but not chromogranin. Chromogranin levels correlated with different event-free survival (EFS), whereas sHLA-E and -F levels also correlated with different OS. Association with OS was also detected considering only patients with metastatic disease. In conclusion, low levels of sHLA-E and -F significantly associated with worse EFS/OS in the whole cohort of NB patients and in patients with metastatic NB. Thus, these molecules deserve to be tested in prospective studies to evaluate their predictive power for high-risk NB patients.

  14. Plasma Levels of Soluble HLA-E and HLA-F at Diagnosis May Predict Overall Survival of Neuroblastoma Patients

    Directory of Open Access Journals (Sweden)

    Fabio Morandi

    2013-01-01

    Full Text Available The purpose of this study was to identify the plasma/serum biomarkers that are able to predict overall survival (OS of neuroblastoma (NB patients. Concentration of soluble (s biomarkers was evaluated in plasma (sHLA-E, sHLA-F, chromogranin, and B7H3 or serum (calprotectin samples from NB patients or healthy children. The levels of biomarkers that were significantly higher in NB patients were then analyzed considering localized or metastatic subsets. Finally, biomarkers that were significantly different in these two subsets were correlated with patient’s outcome. With the exception of B7H3, levels of all molecules were significantly higher in NB patients than those in controls. However, only chromogranin, sHLA-E, and sHLA-F levels were different between patients with metastatic and localized tumors. sHLA-E and -F levels correlated with each other but not chromogranin. Chromogranin levels correlated with different event-free survival (EFS, whereas sHLA-E and -F levels also correlated with different OS. Association with OS was also detected considering only patients with metastatic disease. In conclusion, low levels of sHLA-E and -F significantly associated with worse EFS/OS in the whole cohort of NB patients and in patients with metastatic NB. Thus, these molecules deserve to be tested in prospective studies to evaluate their predictive power for high-risk NB patients.

  15. Polymorphism of HLA-A and HLA-B in pre-eclampsia%HLA-A和HLA-B的多态性与先兆子痫

    Institute of Scientific and Technical Information of China (English)

    张展; 贾莉婷; 张琳琳

    2009-01-01

    Objective: To investigate the association between the polymorphism of HLA-A, HLA-B genes and pre-eclampsia. Methods: HLA-A, HLA-B genotyping was performed by polymerase chain reaction sequence-specific primer (PCR-SSP) in 119 preeclampsia patients, 117 normal pregnant women and their neonates. Results: The study showed that 16 HLA-A and 39 HLA-B alleles were obtained in pre-eclamptic patients and normal pregnant women. 15 HLA-A and 37 HLA-B alleles were obtained in their neonates. No significant difference was found in maternal or neonatal HLA-A, HLA-B alleles be-tween pre-eclampsia group and control group (Pc>0. 05). The frequencies of HLA-A11, HLA-A24,HLA-B13, HLA-B14, HLA-B15, HLA-B52 maternal/fetus genetic assoications were significantly different between pre-eclampsia group and control group (P<0. 05). Conclusion: Some HLA-A, HLA-B maternal/fetus special bindings may be associated with the susceptibility or protective of pre-eclampsia.

  16. Preimplantation genetic diagnosis: an ambiguous legal status for an ambiguous medical and social practice.

    Science.gov (United States)

    Christian, B Y K

    2008-01-01

    Preimplantation Genetic Diagnosis (PGD) is a technique that is strictly regulated in most European countries where it is regularly practised, the legal status of PGD may appear to some as unethical because it may be viewed as a facilitator for those who would like to select children for reason other than medical. The need to test human embryos before birth and the consequences that may occur to those detected with some abnormalities also revives the issue of the respect due to the human embryo. In this paper the author analyse these matters.

  17. HLA DNA sequence variation among human populations: molecular signatures of demographic and selective events.

    Directory of Open Access Journals (Sweden)

    Stéphane Buhler

    Full Text Available Molecular differences between HLA alleles vary up to 57 nucleotides within the peptide binding coding region of human Major Histocompatibility Complex (MHC genes, but it is still unclear whether this variation results from a stochastic process or from selective constraints related to functional differences among HLA molecules. Although HLA alleles are generally treated as equidistant molecular units in population genetic studies, DNA sequence diversity among populations is also crucial to interpret the observed HLA polymorphism. In this study, we used a large dataset of 2,062 DNA sequences defined for the different HLA alleles to analyze nucleotide diversity of seven HLA genes in 23,500 individuals of about 200 populations spread worldwide. We first analyzed the HLA molecular structure and diversity of these populations in relation to geographic variation and we further investigated possible departures from selective neutrality through Tajima's tests and mismatch distributions. All results were compared to those obtained by classical approaches applied to HLA allele frequencies.Our study shows that the global patterns of HLA nucleotide diversity among populations are significantly correlated to geography, although in some specific cases the molecular information reveals unexpected genetic relationships. At all loci except HLA-DPB1, populations have accumulated a high proportion of very divergent alleles, suggesting an advantage of heterozygotes expressing molecularly distant HLA molecules (asymmetric overdominant selection model. However, both different intensities of selection and unequal levels of gene conversion may explain the heterogeneous mismatch distributions observed among the loci. Also, distinctive patterns of sequence divergence observed at the HLA-DPB1 locus suggest current neutrality but old selective pressures on this gene. We conclude that HLA DNA sequences advantageously complement HLA allele frequencies as a source of data used

  18. HLA and Bronchopulmonary Dysplasia Susceptibility: A Pilot Study

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    Gustavo Rocha

    2011-01-01

    Full Text Available There is little data on the association between Human Leucocyte Antigen (HLA alleles and Bronchopulmonary Dysplasia (BPD of the preterm newborn. Our aim was to assess associations between HLA alleles and BPD susceptibility. We studied 156 preterm neonates (82 M/74 F < 32 weeks gestational age, alive at 36 weeks gestational age. Detailed clinical data were collected. HLA typing was performed by PCR-SSO. HLA allele frequencies where determined by direct counting for BPD and no-BPD groups. Comparison between BPD and no BPD groups was performed using t-test, χ2 test or Fisher exact test and logistic regression as appropriate. Relative risks (RR and their 95% confidence intervals (95% CI were also calculated as association measures. We diagnosed 56 (35.9% neonates with mild BPD and 27 (17% with moderate/severe BPD. We found a significant association between HLA-DRB1*01 and mild BPD (OR=3.48[1.23–10.2]. The alleles HLA-A*24, -A*68, -B*51,-Cw*07, -Cw*14, -Cw*15 and -DRB1*01 presented a significant association with moderate/severe BPD. When adjusted to gestational age and birth weight HLA-A*68 (OR=5.41[1.46; 20.05], -B*51 (OR=3.09[1.11; 8.63] and -Cw*14 (OR=4.94[1.15; 21.25] were significantly associated with moderate/severe BPD. Conclusion – Our findings suggest an association between HLA-A*68, -B*51 and -C*14 and BPD susceptibility, and that an autoimmune mechanism may be implicated in the pathogenesis of the disease.

  19. HLA antibody detection with solid phase assays: great expectations or expectations too great?

    Science.gov (United States)

    Gebel, H M; Bray, R A

    2014-09-01

    Alloantibodies directed against HLA antigens, are a barrier to long-term solid organ allograft survival. The clinical impact of preformed, donor-directed HLA alloantibodies range from acceptable risk to unequivocal contraindication for organ transplantation. HLA antibodies are key factors that limit patient access to donor organs. Serological methods were once the only approach to identify HLA antigens and antibodies. Limitations in these technologies led to the development of solid phase approaches. In the early 1990s, the development of the polymerase chain reaction enabled DNA-based HLA antigen testing to be performed. By the mid-1990s, microparticle-based technology that utilized flow cytometry for analysis was developed to detect both classes I and II HLA antibodies. These methodologies revolutionized clinical histocompatibility testing. The strengths and weaknesses of these assays are described in detail in this review.

  20. Characterization of a diverse secretome generated by the mouse preimplantation embryo in vitro

    Directory of Open Access Journals (Sweden)

    O'Neill Chris

    2010-06-01

    Full Text Available Abstract This study investigates the suitability of surface-enhanced laser desorption and ionization time-of-flight (SELDI-TOF and electrospray ionization (ESI mass spectrometry for analysis of the proteins released by the mouse preimplantation embryo in vitro. SELDI-TOF analysis with CM10 or IMAC30 (but not Q10 protein chips detected a protein peak at m/z ~8570 released by both C57BL6 and hybrid embryos. No other peaks unique to the presence of the embryo were identified with this method. ESI mass spectrometry of tryptic digests of embryo-conditioned media identified a total of 20 proteins released during development from the zygote to blastocyst stage. Four proteins were expressed in at least 7 out of 8 cultures tested, one of these (lactate dehydrogenase B was in all cultures. A further five proteins were in at least half of the cultures and 11 more proteins were in at least one culture. The expression of two of these proteins is essential for preimplantation embryo development (NLR family, pyrin domain containing 5 and peptidyl arginine deiminase, type VI. A further four proteins detected have roles in redox regulation of cells, and three others are capable of inducing post-translational modifications of proteins. This study shows the feasibility of ESI mass spectrometry for identifying the proteins secreted by the preimplantation embryo in vitro. This analysis identifies a range of targets that now require detailed functional analysis to assess whether their release by the embryo is an important property of early embryo development.

  1. Prediction of HLA class II alleles using SNPs in an African population.

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    Fasil Tekola Ayele

    Full Text Available Despite the importance of the human leukocyte antigen (HLA gene locus in research and clinical practice, direct HLA typing is laborious and expensive. Furthermore, the analysis requires specialized software and expertise which are unavailable in most developing country settings. Recently, in silico methods have been developed for predicting HLA alleles using single nucleotide polymorphisms (SNPs. However, the utility of these methods in African populations has not been systematically evaluated.In the present study, we investigate prediction of HLA class II (HLA-DRB1 and HLA-DQB1 alleles using SNPs in the Wolaita population, southern Ethiopia. The subjects comprised 297 Ethiopians with genome-wide SNP data, of whom 188 had also been HLA typed and were used for training and testing the model. The 109 subjects with SNP data alone were used for empirical prediction using the multi-allelic gene prediction method. We evaluated accuracy of the prediction, agreement between predicted and HLA typed alleles, and discriminative ability of the prediction probability supplied by the model. We found that the model predicted intermediate (two-digit resolution for HLA-DRB1 and HLA-DQB1 alleles at accuracy levels of 96% and 87%, respectively. All measures of performance showed high accuracy and reliability for prediction. The distribution of the majority of HLA alleles in the study was similar to that previously reported for the Oromo and Amhara ethnic groups from Ethiopia.We demonstrate that HLA class II alleles can be predicted from SNP genotype data with a high level of accuracy at intermediate (two-digit resolution in an African population. This finding offers new opportunities for HLA studies of disease epidemiology and population genetics in developing countries.

  2. The Impact of Biopsy on Human Embryo Developmental Potential during Preimplantation Genetic Diagnosis

    Directory of Open Access Journals (Sweden)

    Danilo Cimadomo

    2016-01-01

    Full Text Available Preimplantation Genetic Diagnosis and Screening (PGD/PGS for monogenic diseases and/or numerical/structural chromosomal abnormalities is a tool for embryo testing aimed at identifying nonaffected and/or euploid embryos in a cohort produced during an IVF cycle. A critical aspect of this technology is the potential detrimental effect that the biopsy itself can have upon the embryo. Different embryo biopsy strategies have been proposed. Cleavage stage blastomere biopsy still represents the most commonly used method in Europe nowadays, although this approach has been shown to have a negative impact on embryo viability and implantation potential. Polar body biopsy has been proposed as an alternative to embryo biopsy especially for aneuploidy testing. However, to date no sufficiently powered study has clarified the impact of this procedure on embryo reproductive competence. Blastocyst stage biopsy represents nowadays the safest approach not to impact embryo implantation potential. For this reason, as well as for the evidences of a higher consistency of the molecular analysis when performed on trophectoderm cells, blastocyst biopsy implementation is gradually increasing worldwide. The aim of this review is to present the evidences published to date on the impact of the biopsy at different stages of preimplantation development upon human embryos reproductive potential.

  3. The Impact of Biopsy on Human Embryo Developmental Potential during Preimplantation Genetic Diagnosis

    Science.gov (United States)

    Cimadomo, Danilo; Capalbo, Antonio; Ubaldi, Filippo Maria; Scarica, Catello; Palagiano, Antonio; Canipari, Rita; Rienzi, Laura

    2016-01-01

    Preimplantation Genetic Diagnosis and Screening (PGD/PGS) for monogenic diseases and/or numerical/structural chromosomal abnormalities is a tool for embryo testing aimed at identifying nonaffected and/or euploid embryos in a cohort produced during an IVF cycle. A critical aspect of this technology is the potential detrimental effect that the biopsy itself can have upon the embryo. Different embryo biopsy strategies have been proposed. Cleavage stage blastomere biopsy still represents the most commonly used method in Europe nowadays, although this approach has been shown to have a negative impact on embryo viability and implantation potential. Polar body biopsy has been proposed as an alternative to embryo biopsy especially for aneuploidy testing. However, to date no sufficiently powered study has clarified the impact of this procedure on embryo reproductive competence. Blastocyst stage biopsy represents nowadays the safest approach not to impact embryo implantation potential. For this reason, as well as for the evidences of a higher consistency of the molecular analysis when performed on trophectoderm cells, blastocyst biopsy implementation is gradually increasing worldwide. The aim of this review is to present the evidences published to date on the impact of the biopsy at different stages of preimplantation development upon human embryos reproductive potential. PMID:26942198

  4. A Simplified PCR-SSP Method for HLA-A2 Subtype in a Population of Wuhan, China

    Institute of Scientific and Technical Information of China (English)

    Bing Liang; Lijun Zhu; Zhihui Liang; Xiufang Weng; Xiaoling Lu; Cai'e Zhang; Hui Li; Xiongwen Wu

    2006-01-01

    HLA-A2 is the most frequent HLA-A allele in all ethnic populations, and an important restriction element for peptide presentation to T cells in infectious disease and cancer. However, the HLA-A2 supertype consisting of up to 75 subtypes, mutation studies and analyses using cytotoxic T lymphocytes suggest the functional relevance of subtype-specific differences in HLA-A2 molecules for peptide binding and T-cell recognition. Therefore, it is necessary for T-cell response study to discriminate the HLA-A2 subtypes and to understand the profile of HLA-A2 allelic distribution in a given population. In this study, we developed a simple, robust approach based on the nested polymerase chain reaction using sequence-specific primers (PCR-SSP) to discriminate 17 HLA-A2 subtypes which cover the most HLA-A2 alleles (> 99% allele frequency) reported in Chinese, using 15 combinations of 19 allelic specific primers. In the first round of PCR, 3 combinations of 5 primers were used to determine whether the tested sample was HLA-A2 positive, meanwhile the subtypes of HLA-A*0209 and HLA-A*0215N were determined for the variant position of these two subtypes is in exon 4 instead of exon 2, 3. Samples of HLA-A2 positive were subtyped in the second round of PCR, using PCR products of the first round as templates. This strategy was applied to test the samples of 78 random HLA-A2 positive individuals for their HLA-A2 subtypes. Those samples were screened for HLA-A2 positive by the first round PCR-SSP from 154 healthy blood donors in Wuhan, China. The subtyping results were verified by using flow cytometric analysis (FCM) with HLA-A2 specific monoclonal antibody BB7.2 and DNA sequencing. The typing results of the samples show 50.7% random individuals in the population carry HLA-A2, HLA-A*0201 ranks the first (allele frequency = 15.5%), followed by A*0207 (5.8%),A*0206 (4.7%), A*0203 (2.6%), A*0210 (0.7%), and these 5 alleles account for 99.0% HLA-A2 subtypes of allele frequency. Our study

  5. Occurrence of Fatal and Nonfatal Adverse Outcomes after Heart Transplantation in Patients with Pretransplant Noncytotoxic HLA Antibodies

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    Luciano Potena

    2013-01-01

    Full Text Available HLA antibodies (HLA ab in transplant candidates have been associated with poor outcome. However, clinical relevance of noncytotoxic antibodies after heart transplant (HT is controversial. By using a Luminex-based HLA screening, we retested pretransplant sera from HT recipients testing negative for cytotoxic HLA ab and for prospective crossmatch. Out of the 173 consecutive patients assayed (52±13y; 16% females; 47% ischemic etiology, 32 (18% showed pretransplant HLA ab, and 12 (7% tested positive against both class I and class II HLA. Recipients with any HLA ab had poorer survival than those without (65±9 versus 82±3%; P=0.02, accounting for a doubled independent mortality risk (P=0.04. In addition, HLA-ab detection was associated with increased prevalence of early graft failure (35 versus 15%; P=0.05 and late cellular rejection (29 versus 11%; P=0.03. Of the subgroup of 37 patients suspected for antibody mediated rejection (AMR, the 9 with pretransplant HLA ab were more likely to display pathological AMR grade 2 (P=0.04. By an inexpensive, luminex-based, HLA-screening assay, we were able to detect non-cytotoxic HLA ab predicting fatal and nonfatal adverse outcomes after heart transplant. Allocation strategies and desensitization protocols need to be developed and prospectively tested in these patients.

  6. Practices and ethical concerns regarding preimplantation diagnosis. Who regulates preimplantation genetic diagnosis in Brazil?

    Directory of Open Access Journals (Sweden)

    B.B. Damian

    2015-01-01

    Full Text Available Preimplantation genetic diagnosis (PGD was originally developed to diagnose embryo-related genetic abnormalities for couples who present a high risk of a specific inherited disorder. Because this technology involves embryo selection, the medical, bioethical, and legal implications of the technique have been debated, particularly when it is used to select features that are not related to serious diseases. Although several initiatives have attempted to achieve regulatory harmonization, the diversity of healthcare services available and the presence of cultural differences have hampered attempts to achieve this goal. Thus, in different countries, the provision of PGD and regulatory frameworks reflect the perceptions of scientific groups, legislators, and society regarding this technology. In Brazil, several texts have been analyzed by the National Congress to regulate the use of assisted reproduction technologies. Legislative debates, however, are not conclusive, and limited information has been published on how PGD is specifically regulated. The country requires the development of new regulatory standards to ensure adequate access to this technology and to guarantee its safe practice. This study examined official documents published on PGD regulation in Brazil and demonstrated how little direct oversight of PGD currently exists. It provides relevant information to encourage reflection on a particular regulation model in a Brazilian context, and should serve as part of the basis to enable further reform of the clinical practice of PGD in the country.

  7. HLA polymorphism in Sudanese renal donors

    Directory of Open Access Journals (Sweden)

    Ameer M Dafalla

    2011-01-01

    Full Text Available The main objective of this study is to provide a database for renal transplantation in Sudan and to determine the HLA antigens and haplotype frequencies (HFs in the study subjects. HLA typing was performed using the complement-dependant lymphocytotoxicity test in 250 unrelated healthy individuals selected as donors in the Sudanese Renal Transplantation Program. Considerable polymorphism was observed at each locus; A2 (0.28, A30 (0.12, A3 (0.09, A24 (0.09, A1 (0.09, and A68 (0.06 were the most frequent antigens in the A locus, while B51 (0.092, B41 (0.081, B39 (0.078, B57 (0.060, B35 (0.068, B 50 (0.053 and B 52 (0.051 were the most common B locus antigens. DR13 (0.444 and DR15 (0.160 showed the highest antigen frequencies (AFs in the DR locus. In the DQ locus, DQ1 showed the highest gene frequency (0.498, while DQ2 and DQ3 AFs were (0.185 and (0.238, respectively. The most common HLA-A and -B haplotypes in positive linkage disequilibrium were A24, B38; A1, B7; and A3, B52. The common HLA-A and -B HFs in positive linkage disequilibrium in the main three tribe-stocks of the study subjects (Gaalia, Nile Nubian and Johyna were A24, B38 for Gaalia; A24, B38 and A2, B7 for Johyna; and A2, B64 and A3, B53 for Nile Nubian. These results suggest that both class I and class II polymorphisms of the study subjects depict considerable heterogeneity, which reflects recent admixture of this group with neighboring Arabs and African populations.

  8. Investigation of DNA repair in human oocytes and preimplantation embryos

    OpenAIRE

    Jaroudi, S.

    2010-01-01

    DNA repair genes are expressed in mammalian embryos and in human germinal vesicles, however, little is known about DNA repair in human preimplantation embryos. This project had three aims: 1) to produce a DNA repair profile of human MII oocytes and blastocysts using expression arrays and identify repair pathways that may be active before and after embryonic genome activation; 2) to design an in vitro functional assay that targeted mismatch repair and which could be applied to human oocytes...

  9. Association of HLA-A, -B, and -DRB1 with pulmonary tuberculosis in western Javanese Indonesia.

    Science.gov (United States)

    Yuliwulandari, Rika; Sachrowardi, Qomariyah; Nakajima, Humiaki; Kashiwase, Koichi; Hirayasu, Kouyuki; Mabuchi, Akihiko; Sofro, Abdul Salam Mudzakir; Tokunaga, Katsushi

    2010-07-01

    Genetic studies of pulmonary tuberculosis (PTB), including those of human leukocyte antigen (HLA) genes, have been reported in several populations. Some studies also have reported these genes to have a stronger role in severe tuberculosis. We investigated HLA class I and II alleles and haplotypes to ascertain their role in susceptibility and resistance to new and recurrent PTB in 257 PTB patients (216 new and 41 recurrent PTB patients) and 236 healthy controls in Western Javanese (Indonesia). HLA-B*4006 was associated with new PTB (p = 0.044, p(adj) = ns), whereas HLA-B*1802, HLA-B*4001 and HLA-DRB1*1101 were associated with recurrent PTB (p = 0.013, p(adj) = 0.016; p = 0.015, p(adj) = 0.028; and p = 0.008, p(adj) = 0.027 for new PTB vs recurrent PTB, respectively). Except for HLA-B*4006, those associations remained significant after adjustment for age and gender by logistic regression analysis, although they disappeared after correction for multiple testing. Haplotype HLA-B*1802-DRB1*1202 was associated with susceptibility to recurrent PTB (p = 0.014, odds ratio = 3.8, 95% confidence interval = 1.18-12.27). In contrast, HLA-DRB1*1202 in the absence of HLA-B*1802 showed a significant association with resistance to recurrent PTB (p = 8.2 x 10(-4), odds ratio = 0.32, 95% confidence interval = 0.16-0.64), suggesting that stronger susceptibility effect of HLA-B*1802 masked the protective effect of HLA-DRB1*1202. Further studies using larger number of patients with recurrent PTB will be needed to confirm our findings.

  10. Expression of connexins in human preimplantation embryos in vitro

    Directory of Open Access Journals (Sweden)

    Leese Henry J

    2004-06-01

    Full Text Available Abstract Intercellular communication via gap junctions is required to coordinate developmental processes in the mammalian embryo. We have investigated if the connexin (Cx isoforms known to form gap junctions in rodent preimplantation embryos are also expressed in human embryos, with the aim of identifying species differences in communication patterns in early development. Using a combination of polyA PCR and immunocytochemistry we have assessed the expression of Cx26, Cx31, Cx32, Cx40, Cx43 and Cx45 which are thought to be important in early rodent embryos. The results demonstrate that Cx31 and Cx43 are the main connexin isoforms expressed in human preimplantation embryos and that these isoforms are co-expressed in the blastocyst. Cx45 protein is expressed in the blastocyst but the protein may be translated from a generally low level of transcripts: which could only be detected in the PN to 4-cell embryos. Interestingly, Cx40, which is expressed by the extravillous trophoblast in the early human placenta, was not found to be expressed in the blastocyst trophectoderm from which this tissue develops. All of the connexin isoforms in human preimplantation embryos are also found in rodents pointing to a common regulation of these connexins in development of rodent and human early embryos and perhaps other species.

  11. Comparison of HLA allelic imputation programs

    Science.gov (United States)

    Shaffer, Christian M.; Bastarache, Lisa; Gaudieri, Silvana; Glazer, Andrew M.; Steiner, Heidi E.; Mosley, Jonathan D.; Mallal, Simon; Denny, Joshua C.; Phillips, Elizabeth J.; Roden, Dan M.

    2017-01-01

    Imputation of human leukocyte antigen (HLA) alleles from SNP-level data is attractive due to importance of HLA alleles in human disease, widespread availability of genome-wide association study (GWAS) data, and expertise required for HLA sequencing. However, comprehensive evaluations of HLA imputations programs are limited. We compared HLA imputation results of HIBAG, SNP2HLA, and HLA*IMP:02 to sequenced HLA alleles in 3,265 samples from BioVU, a de-identified electronic health record database coupled to a DNA biorepository. We performed four-digit HLA sequencing for HLA-A, -B, -C, -DRB1, -DPB1, and -DQB1 using long-read 454 FLX sequencing. All samples were genotyped using both the Illumina HumanExome BeadChip platform and a GWAS platform. Call rates and concordance rates were compared by platform, frequency of allele, and race/ethnicity. Overall concordance rates were similar between programs in European Americans (EA) (0.975 [SNP2HLA]; 0.939 [HLA*IMP:02]; 0.976 [HIBAG]). SNP2HLA provided a significant advantage in terms of call rate and the number of alleles imputed. Concordance rates were lower overall for African Americans (AAs). These observations were consistent when accuracy was compared across HLA loci. All imputation programs performed similarly for low frequency HLA alleles. Higher concordance rates were observed when HLA alleles were imputed from GWAS platforms versus the HumanExome BeadChip, suggesting that high genomic coverage is preferred as input for HLA allelic imputation. These findings provide guidance on the best use of HLA imputation methods and elucidate their limitations. PMID:28207879

  12. Widespread non-additive and interaction effects within HLA loci modulate the risk of autoimmune diseases

    NARCIS (Netherlands)

    Lenz, Tobias L; Deutsch, Aaron J; Han, Buhm; Hu, Xinli; Okada, Yukinori; Eyre, Stephen; Knapp, Michael; Zhernakova, Alexandra; Huizinga, Tom W J; Abecasis, Gonçalo; Becker, Jessica; Boeckxstaens, Guy E; Chen, Wei-Min; Franke, Andre; Gladman, Dafna D; Gockel, Ines; Gutierrez-Achury, Javier; Martin, Javier; Nair, Rajan P; Nöthen, Markus M; Onengut-Gumuscu, Suna; Rahman, Proton; Rantapää-Dahlqvist, Solbritt; Stuart, Philip E; Tsoi, Lam C; van Heel, David A; Worthington, Jane; Wouters, Mira M; Klareskog, Lars; Elder, James T; Gregersen, Peter K; Schumacher, Johannes; Rich, Stephen S; Wijmenga, Cisca; Sunyaev, Shamil R; de Bakker, Paul I W; Raychaudhuri, Soumya

    2015-01-01

    Human leukocyte antigen (HLA) genes confer substantial risk for autoimmune diseases on a log-additive scale. Here we speculated that differences in autoantigen-binding repertoires between a heterozygote's two expressed HLA variants might result in additional non-additive risk effects. We tested the

  13. Human monoclonal HLA antibodies reveal interspecies crossreactive swine MHC class I epitopes relevant for xenotransplantation.

    NARCIS (Netherlands)

    Mulder, A.; Kardol, M.J.; Arn, J.S.; Eijsink, C.; Franke, M.E.; Schreuder, G.M.; Haasnoot, G.W.; Doxiadis, I.I.; Sachs, D.H.; Smith, D.M.; Claas, F.H.

    2010-01-01

    Crossreactivity of anti-HLA antibodies with SLA alleles may limit the use of pig xenografts in some highly sensitized patients. An understanding of the molecular basis for this crossreactivity may allow better selection of xenograft donors. We have tested 68 human monoclonal HLA class I antibodies (

  14. Classification of human leukocyte antigen (HLA) supertypes

    DEFF Research Database (Denmark)

    Wang, Mingjun; Claesson, Mogens H

    2014-01-01

    Identification of new antigenic peptides, derived from infectious agents or cancer cells, which bind to human leukocyte antigen (HLA) class I and II molecules, is of importance for the development of new effective vaccines capable of activating the cellular arm of the immune response. However...... this complexity is to group thousands of different HLA molecules into several so-called HLA supertypes: a classification that refers to a group of HLA alleles with largely overlapping peptide binding specificities. In this chapter, we focus on the state-of-the-art classification of HLA supertypes including HLA...

  15. No beneficial effect of preimplantation genetic screening in women of advanced maternal age with a high risk for embryonic aneuploidy

    NARCIS (Netherlands)

    Twisk, Moniek; Mastenbroek, Sebastiaan; Hoek, Annemieke; Heineman, Maas-Jan; van der Veen, Fulco; Bossuyt, Patrick M.; Repping, Sjoerd; Korevaar, Johanna C.

    2008-01-01

    Human preimplantation embryos generated through in vitro fertilization (IVF) or intracytoplasmic sperm injection (ICSI) treatments show a variable rate of numerical chromosome abnormalities or aneuploidies. Preimplantation genetic screening (PGS) has been designed to screen for aneuploidies in high

  16. No beneficial effect of preimplantation genetic screening in women of advanced maternal age with a high risk for embryonic aneuploidy

    NARCIS (Netherlands)

    Twisk, Moniek; Mastenbroek, Sebastiaan; Hoek, Annemieke; Heineman, Maas-Jan; van der Veen, Fulco; Bossuyt, Patrick M.; Repping, Sjoerd; Korevaar, Johanna C.

    2008-01-01

    Human preimplantation embryos generated through in vitro fertilization (IVF) or intracytoplasmic sperm injection (ICSI) treatments show a variable rate of numerical chromosome abnormalities or aneuploidies. Preimplantation genetic screening (PGS) has been designed to screen for aneuploidies in high

  17. Strategies to work with HLA data in human populations for histocompatibility, clinical transplantation, epidemiology and population genetics: HLA-NET methodological recommendations

    Science.gov (United States)

    Sanchez-Mazas, A; Vidan-Jeras, B; Nunes, J M; Fischer, G; Little, A-M; Bekmane, U; Buhler, S; Buus, S; Claas, F H J; Dormoy, A; Dubois, V; Eglite, E; Eliaou, J F; Gonzalez-Galarza, F; Grubic, Z; Ivanova, M; Lie, B; Ligeiro, D; Lokki, M L; da Silva, B Martins; Martorell, J; Mendonça, D; Middleton, D; Voniatis, D Papioannou; Papasteriades, C; Poli, F; Riccio, M E; Vlachou, M Spyropoulou; Sulcebe, G; Tonks, S; Nevessignsky, M Toungouz; Vangenot, C; van Walraven, A-M; Tiercy, J-M

    2012-01-01

    programs capable of dealing with ambiguous data, such as the ‘gene[rate]’ computer tools to estimate frequencies, test for Hardy–Weinberg equilibrium and selective neutrality on data containing any number and kind of ambiguities. WG4 (Ethical issues) proposes to adopt thorough general principles for any HLA population study to ensure that it conforms to (inter)national legislation or recommendations/guidelines. All HLA-NET guidelines and tools are available through its website http://hla-net.eu. PMID:22533604

  18. HLA class I expression in bladder carcinomas.

    Science.gov (United States)

    Cabrera, T; Pedrajas, G; Cozar, J M; Garrido, A; Vicente, J; Tallada, M; Garrido, F

    2003-10-01

    HLA class I molecules are frequently lost in a large variety of human carcinomas, possibly because of T-cell immune selection of major histocompatibility complex class I deficient tumor variants. We report that this phenomenon is also a frequent event in bladder carcinomas. Of a total of 72 bladder carcinomas, 72% of the tumors had at least one alteration in HLA class I expression. These altered HLA class I phenotypes were classified as total HLA class I loss (25%; phenotype I); HLA-A or/and HLA-B locus-specific loss (12%; phenotype III); and HLA class I allelic loss (35%; phenotype II or IV). Comparison of histopathological parameters with HLA class I expression showed a statistically significant relationship with the degree of differentiation and tumor recurrence.

  19. Associations of HLA-A, -B and -DRB1 types with oral diseases in Swiss adults.

    Directory of Open Access Journals (Sweden)

    Matti Mauramo

    Full Text Available Human leukocyte antigens (HLA are crucial components of host defense against microbial challenge but the associations of HLA types with oral infectious diseases have not been studied in detail. This prospective cross-sectional study examined associations of HLA-A, -B and -DRB1 types with common oral diseases in a healthy Swiss adult population. 257 subjects (107 m, 150 f, mean age: 43.5 yr; range: 21-58 yr with known HLA-A, -B and -DRB1 profiles and comprehensive medical records were included. A thorough anamnesis was followed by oral examinations including saliva flow measurements, the DMFT score for cariological status, complete periodontal status with plaque and bleeding indexes as well as assessment of mucosal alterations and temporomandibular dysfunction (TMD. Student's t-test and Pearson chi-square test were utilized to compare the oral diseases between HLA positive and negative subjects. Bonferroni correction for multiple comparisons was used and PBonf<0.05 was considered statistically significant. HLA types -B15 (PBonf = 0.002, -B51 (PBonf = 0.02 and -DRB1*12 (PBonf = 0.02 were associated with less periodontal disease manifestations. HLA-A32 had a positive association with TMD dysfunction (PBonf = 0.012. No other statistically significant associations were observed. In conclusion, HLA types may contribute to the development of oral diseases in generally healthy Caucasian adults.

  20. HLA-DR-positive cells in large plaque (atrophic) parapsoriasis.

    Science.gov (United States)

    McMillan, E M; Wasik, R; Everett, M A

    1981-10-01

    The development of a monoclonal antibody directed against HLA DR (Ia-like) antigens of B cells and monocytes but not against normal peripheral human T cells suggested that this antibody might be used as a marker of B cells and monocytes in tissue sections. The T cell nature of large plaque (atrophic) parapsoriasis has recently been demonstrated by the immunoperoxidase technic. Immunoperoxidase examination of serial sections of tissues from two cases of large plaque parapsoriasis with one T cell antiserum, two monoclonal T cell antibodies, and one monoclonal reagent directed against HLA DR indicated that T cells in the cutaneous infiltrates were also HLA DR-positive. Evidence is accumulating that HLA DR positivity may be expressed by activated T cells. The findings here therefore suggest that many of the T lymphoid cells in two cases of large plaque (atrophic) parapsoriasis examined were activated in nature, and that HLA DR may not be a specific marker for B cells and monocytes in certain pathologic conditions. Caution should therefore presently be exercised in attempting to use this marker for the specific identification of B cells and monocytes in pathologic specimens, without simultaneous testing for T cell markers.

  1. Research about the disassociated cases between HLA-DRB1、HLA-DRB3、 HLA-DRB4、HLA-DRB5 locus and HLA-DQ locus%HLA-DRB1、HLA-DRB3、HLA-DRB4、HLA-DRB5与HLA-DQ位点不关联病例的研究

    Institute of Scientific and Technical Information of China (English)

    赵丹丹; 孙敬芬; 朱海燕; 韩晓苹; 金荔; 刘楠; 奚永志; 高春纪; 于力

    2008-01-01

    目的:完善目前已知的HLA-DR与HLA-DQ关联表.方法:从2000~2006年间到我们实验室配型的供患者中选出与关联表不相符的16例标本并对这些标本进行高分辨鉴定.结果:发现在中国汉族人中的五条HLA-DR与HLA-DQ位点连锁遗传的单倍体.结论:为目前所用的HLA-DR与HLA-DQ位点关联表在中国人群中增加五个新的单倍体,使关联表更适合于中国人群.

  2. Factors affecting the gene expression of in vitro cultured human preimplantation embryos

    NARCIS (Netherlands)

    Mantikou, E.; Jonker, M.J.; Wong, K.M.; van Montfoort, A.P.A.; de Jong, M.; Breit, T.M.; Repping, S.; Mastenbroek, S.

    2016-01-01

    STUDY QUESTION: What is the relative effect of common environmental and biological factors on transcriptome changes during human preimplantation development? SUMMARY ANSWER: Developmental stage and maternal age had a larger effect on the global gene expression profile of human preimplantation embryo

  3. Differences in gene expression profiles between human preimplantation embryos cultured in two different IVF culture media

    NARCIS (Netherlands)

    Kleijkers, S.H.M.; Eijssen, L.M.T.; Coonen, E.; Derhaag, J.G.; Mantikou, E.; Jonker, M.J.; Mastenbroek, S.; Repping, S.; Evers, J.L.H.; Dumoulin, J.C.M.; van Montfoort, A.P.A.

    2015-01-01

    STUDY QUESTION: Is gene expression in human preimplantation embryos affected by the medium used for embryo culture in vitro during an IVF treatment? SUMMARY ANSWER: Six days of in vitro culture of human preimplantation embryos resulted in medium-dependent differences in expression level of genes inv

  4. HLA-DRB1 alleles in juvenile-onset systemic lupus erythematosus: renal histologic class correlations

    Directory of Open Access Journals (Sweden)

    B.L. Liphaus

    2007-04-01

    Full Text Available Human leukocyte antigens (HLA DRB1*03 and DRB1*02 have been associated with systemic lupus erythematosus (SLE in Caucasians and black populations. It has been observed that certain HLA alleles show stronger associations with SLE autoantibodies and clinical subsets, although they have rarely been associated with lupus renal histologic class. In the present study, HLA-DRB1 allele correlations with clinical features, autoantibodies and renal histologic class were analyzed in a cohort of racially mixed Brazilian patients with juvenile-onset SLE. HLA-DRB1 typing was carried out by polymerase chain reaction amplification with sequence-specific primers using genomic DNA from 55 children and adolescents fulfilling at least four of the American College of Rheumatology criteria for SLE. Significance was determined by the chi-square test applied to 2 x 2 tables. The HLA-DRB1*15 allele was most frequent in patients with renal, musculoskeletal, cutaneous, hematologic, cardiac, and neuropsychiatric involvement, as well as in patients positive for anti-dsDNA, anti-Sm, anti-U1-RNP, and anti-SSA/Ro antibodies, although an association between HLA alleles and SLE clinical features and autoantibodies could not be observed. The HLA-DRB1*17, HLA-DRB1*10, HLA-DRB1*15, and HLA-DRB1*07 alleles were significantly higher in patients with renal histologic class I, class IIA, class IIB, and class V, respectively. The present results suggest that the contribution of HLA- DRB1 alleles to juvenile-onset SLE could not be related to clinical or serological subsets of the disease, but it may be related to renal histologic classes, especially class I, class II A, class II B, and class V. The latter correlations have not been observed in literature.

  5. Template Driven Code Generator for HLA Middleware

    NARCIS (Netherlands)

    Jansen, R.E.J.; Prins, L.M.; Huiskamp, W.

    2007-01-01

    HLA is the accepted standard for simulation interoperability. However, the HLA services and the API that is provided for these services are relatively complex from the user point of view. Since the early days of HLA, federate developers have attempted to simplify their task by using middleware that

  6. Template Driven Code Generator for HLA Middleware

    NARCIS (Netherlands)

    Jansen, R.E.J.; Prins, L.M.; Huiskamp, W.

    2007-01-01

    HLA is the accepted standard for simulation interoperability. However, the HLA services and the API that is provided for these services are relatively complex from the user point of view. Since the early days of HLA, federate developers have attempted to simplify their task by using middleware that

  7. HLA-B17 and the HLA-A1, B17 haplotype in acute myelogenous leukemia.

    Science.gov (United States)

    Heise, E; Parrish, E; Cooper, R

    1979-08-01

    Seventy-nine Caucasians with acute myelogenous leukemia (AML) were genotyped to determine whether AML, the induction of remission or patient survival were associated with particular HLA phenotypes or haplotypes. HLA-B17 and B27 were increased in AML patients over 40 years of age. Combined analysis of four independent studies indicates that HLA-B17 is significantly but weakly associated with AML, relative risk = 1.48 (.01 less than P less than .025). The A1, B17 and Aw24, Bw35 haplotypes occurred more frequently in the AML group as compared to racial and geographic controls (uncorrected P = 0.0068 and 0.0098, respectively Fisher's Exact Test). Induction of remission occurred less frequently in patients with the B17 phenotype as compared to patients lacking this antigen (P = 0.047). Patient survival was associated with remission status (P = 0.002) but was not significantly associated with particular HLA phenotypes or haplotypes. These results indicate that a gene or genes in the HLA-B region of the major histocompatibility complex can influence susceptibility to AML and also the response to chemotherapy.

  8. Results on single cell PCR for Huntington's gene and WAVE product analysis for preimplantation genetic diagnosis.

    Science.gov (United States)

    Drury, K C; Liu, M C; Lilleberg, S; Kipersztok, S; Williams, R S

    2001-10-22

    Triple repeat base pair amplification is the basis for a number of prevalent genetic diseases such as Huntington's, Fragile X, Myotonic Dystrophy and others. We have chosen to investigate the use of PCR to amplify a portion of the Huntington's gene in single cells in order to develop a clinical test system for preimplantation genetic diagnosis (PGD). Amplification of CAG triple repeat sequences poses difficulties due to resistance of GC melting for amplification. Special PCR modifications are necessary to carry out the amplification of GC rich areas found in most triple base pair expansions. We have used a modified polymerase chain reaction (PCR) protocol to amplify the expanded repeat sequence of the Huntington's gene with satisfactory efficiency. Detection of the amplified expanded CAG repeats is shown to be possible using both agarose gel electrophoresis and high definition denaturing high pressure liquid (DHPLC) chromatography. The incidence of allele dropout (ADO) is documented.

  9. Choosing between possible lives: legal and ethical issues in preimplantation genetic diagnosis.

    Science.gov (United States)

    Scott, Rosamund

    2006-01-01

    This article critically appraises the current legal scope of the principal applications of preimplantation genetic diagnosis (PGD). This relatively new technique, which is available to some parents undergoing in vitro fertilization (IVF) treatment, aims to ensure that a child is not born with a seemingly undesirable genetic condition. The question addressed here is whether there should be serious reasons to test for genetic conditions in embryos in order to be able to select between them. The Human Fertilisation and Embryology Authority and the Human Genetics Commission have decided that there should be such reasons by broadly aligning the criteria for PGD with those for selective abortion. This stance is critically explored, as are its implications for the possible use of PGD to select either against or for marginal features or for significant traits. The government is currently reviewing the legal scope and regulation of PGD.

  10. Preimplantation Genetic Diagnosis for Monogenic Disorders and Chromosomal Rearrangements – The German Perspective

    Directory of Open Access Journals (Sweden)

    Koehler U

    2013-01-01

    Full Text Available Since its dawn in the late 1980s, preimplantation genetic diagnosis (PGD, or präimplantationsdiagnostik, PID has evolved into a well-established technique, which can be offered to couples at risk of transmitting a mutation or a chromosomal aberration to their offspring. Polar bodies as well as day 3 blastomeres and day 5 blastocysts (trophectoderm can be employed for the detection of a specific gene mutation or unbalanced karyotypes. For the latter, array comparative genomic hybridisation (array CGH has replaced fluorescence in situ hybridisation (FISH approaches. Furthermore, as blastocysts seem to exhibit less mosaicism compared to blastomeres, current PGD protocols focus on the analysis of blastocysts, however polar body testing is still applied for maternally derived conditions. In November 2011, the German embryo protection law (ESchG has been supplemented by §3a, which defines the conditions for the legal implementation of PGD (PräimpG in Germany.

  11. Relevance of LIF and EGF on Mouse Preimplantation Embryo Development

    Directory of Open Access Journals (Sweden)

    Iraj Amiri

    2008-01-01

    Full Text Available Objective: Recent evidence suggests that Leukemia Inhibitory Factor (LIF, a member ofinterleukin-6 family, has biological actions on preimplantation embryo development. Alsoit is established that Epidermal Growth Factor (EGF, a strong mitosis-promoting agent,improves the preimplantation embryo development by increasing the cell metabolism andproliferation. The purpose of the present study is to investigate the effects of these factors,alone and in combination together, on preimplantation and development of the embryo.Materials and Methods: Six to eight weeks old NMRI mice were super ovulated by injectionof 10IU PMSG and 10IU hCG, then the mated mice were killed 46 hours later. Theiroviducts were flushed, two-cell embryos collected and divided randomly to the four groupsas following: Control, treatment 1 (LIF, treatment 2 (EGF, treatment 3 (LIF+EGF. In eachgroup, the embryos were cultured in an incubator at 37°C with 5% CO2 and 90% humidityfor 72hrs. The state of embryo development was evaluated in 24,36,48,60 and 72hrsfollowing the embryos cultures. By the end of the cultures, cell apoptosis was studiedby the terminal deoxynucleotidyl transferas-mediated dUTP nick end-labeling (TUNELtechnique.Results: Significant difference was detected in the rate of hatching in the LIF and LIF+EGFgroups. This difference was also seen in the rate of blastocyst formation after 36hrs(p<0.05 and in the average of the total cell number (p<0.05 after 72hrs. In comparison tothe apoptotic index, there was no significant difference between the control and treatmentgroups.Conclusion: The findings in this study show a beneficial effect of LIF and EGF on theblastocyst formation, hatching and its total cell numbers in vitro.

  12. Study on preimplantation genetic diagnosis and follow-up for Duchenne muscular dystrophy

    Directory of Open Access Journals (Sweden)

    Juan YANG

    2015-07-01

    Full Text Available Objective  To carry out preimplantation genetic diagnosis (PGD for Duchenne muscular dystrophy (DMD carrier, so as to prevent the birth of affected infants with DMD.  Methods  One DMD gene carrier with a deletion of exon 10-30 received fertilization with intracytoplasmic sperm injection (ICSI. DMD gene and haplotype were tested after amplification of genome DNA in multiple displacement amplification (MDA, then healthy embryos were transferred to uterus according to the genetic results. Genetic testing was made in second trimester and after delivery, and also periodic follow-up was made for over 3 years.  Results  The second cycle of PGD was successful, and a total of 14 single blastomeres obtained from 7 embryos were used for genetic analysis. The success rate of MDA was 13/14, and the allele dropout rate was 18.75% (18/96. Three unaffected embryos were transferred, resulting in twin pregnancy. One healthy boy and one healthy girl were born in cesarean section at the pregnant week of 35. Genetic results on DNA from both amniotic fluid at 16 weeks of gestation and peripheral blood after birth were normal. During the 3-year follow-up, both 2 infants were normal in growth and development, motor function and dynamic monitor of serum creatine kinase (CK.  Conclusions  Preimplantation genetic diagnosis can help DMD gene carrier give birth to healthy infants, and these infants have normal development. DOI: 10.3969/j.issn.1672-6731.2015.06.008

  13. The impact of preimplantation genetic diagnosis on human embryos

    Directory of Open Access Journals (Sweden)

    García-Ferreyra J.

    2016-12-01

    Full Text Available Chromosome abnormalities are extremely common in human oocytes and embryos and are associated with a variety of negative outcomes for both natural cycles and those using assisted reproduction techniques. Aneuploidies embryos may fail to implant in the uterus, miscarry, or lead to children with serious medical problems (e.g., Down syndrome. Preimplantation genetic diagnosis (PGD is a technique that allows the detection of aneuploidy in embryos and seeks to improve the clinical outcomes od assisted reproduction treatments, by ensuring that the embryos chosen for the transfer are chromosomally normal.

  14. Stimulation of HIV-specific T cell clonotypes using allogeneic HLA.

    Science.gov (United States)

    Almeida, Coral-Ann; van Miert, Paula; O'Driscoll, Kane; Zoet, Yvonne M; Chopra, Abha; Watson, Mark; de Santis, Dianne; Witt, Campbell; John, Mina; Claas, Frans H J; D'Orsogna, Lloyd J

    2017-03-28

    We hypothesized that HIV-specific CD8 T cell clonotypes can be stimulated by allogeneic HLA molecules. Multiple HIV-specific CD8 T cell clones were derived from 12 individuals with chronic HIV infection, specific for 13 different HIV Gag antigens and restricted to 7 different HLA molecules. The generated T cell clones were assayed for alloreactivity against a panel of single HLA class I expressing cell lines (SALs). HIV-specific T cells recognising at least one allogeneic HLA molecule could be identified from 7 of 12 patients tested. Allorecognition was associated with IFNγ cytokine production, CD137 upregulation and cytotoxicity, suggesting high avidity allo-stimulation. Allo-HLA recognition by HIV-specific T cells was specific to the HIV target peptide/HLA restriction and TCR TRBV usage of the T cells. HIV-specific T cells do crossreact against allogeneic HLA molecules in an epitope and TRBV specific manner. Therefore allo-HLA stimulation could be exploited to induce or augment HIV-specific T cell responses.

  15. Soluble HLA-G is a differential prognostic marker in sequential colorectal cancer disease stages.

    Science.gov (United States)

    Kirana, Chandra; Ruszkiewicz, Andrew; Stubbs, Richard S; Hardingham, Jennifer E; Hewett, Peter J; Maddern, Guy J; Hauben, Ehud

    2017-06-01

    The expression of HLA-G by tumour cells is an established mechanism to escape recognition and immune mediated destruction, allowing tumour survival, growth and metastasis. However, the prognostic value of soluble HLA-G (sHLA-G) remains unknown. Mucinous carcinoma (MC) is a distinct form of colorectal cancer (CRC) found in 10 to 15% of patients, which has long been associated with poor response to treatment. To investigate the prognostic value of plasma sHLA-G levels in CRC patients, preoperative plasma sHLA-G levels were determined by ELISA in CRC patients (n = 133). In addition, the local expression of HLA-G in tumour biopsies was assessed using tissue microarray analysis (n = 255). Within the high 33rd percentile of sHLA-G levels (265-890 U/mL; n = 44) we observed higher frequency of MC patients (p = 0.012; Chi-square), and higher sHLA-G levels in patients with vascular invasion (p = 0.035; two-tailed t-test). Moreover, MC patients had significantly higher sHLA-G levels compared to those with adenocarcinoma not otherwise specified (p = 0.036; two-tailed t-test). Surprisingly, while stage II patients showed negative correlation between sHLA-G levels and liver metastasis free survival (LMFS) (p = 0.041; R = -0.321), in stage III patients high sHLA-G levels were associated with significantly longer LMFS (p = 0.002), and sHLA-G levels displayed positive correlation with LMFS (p = 0.006; R = 0.409). High HLA-G expression in tumours was associated with poor cancer specific overall survival in stage II to III (p = 0.01), and with shorter LMFS in stage II patients (p = 0.004). Our findings reveal that sHLA-G levels are associated with distinct progression patterns in consecutive disease stages, indicating a potential value as surrogate marker in the differential prognosis of CRC. © 2017 UICC.

  16. Performance of LIFECODES HLA-DQB1 typing kit using Luminex platform in Koreans.

    Science.gov (United States)

    Roh, Eun Youn; In, Ji Won; Shin, Sue; Yoon, Jong Hyun; Park, Kyoung Un; Song, Eun Young

    2015-01-01

    Intermediate-resolution HLA-DQ typing has gained importance in organ transplantation recently. We evaluated the performance of the LIFECODES HLA-DQB1 typing kit (Immucor, USA) using sequence-specific oligonucleotide (SSO) probe and Luminex platform (Luminex Corp., USA) on 100 samples tested by sequence-based typing (SBT) using the AlleleSEQR HLA-DQB1 kit (Abbott Molecular, USA) in Korean individuals. No sample showed ambiguity in the assignment of 4-digit HLA-DQB1 allele with the LIFECODES HLA-DQB1 SSO typing kit, and the results were fully concordant with those of high-resolution typing of AlleleSEQR HLA-DQB1 SBT up to 4-digit level. Three samples required adjustment of false reactions (3/100, 3.0%): two samples with DQB1(*)03:03/(*)06:01 showed false-positive result in probe 253, and 1 sample with DQB1(*)04:02/(*)05:02 showed false-negative result in probe 217. We tested an additional sample with DQB1(*)03:03/(*)06:01, which showed same false-positivity in probe 253 and 2 samples with DQB1(*)04:02/(*)05:02, which showed no false reaction. The false reactions did not result in ambiguity or change in the HLA allele assignment. We could assign HLA-DQB1 alleles to 4 digit-level without ambiguity, with 100% concordance with the SBT results. Thus, LIFECODES HLA-DQB1 SSO typing kit showed good performance for intermediate-resolution HLA-DQB1 typing in clinical laboratory for organ transplantation in Koreans.

  17. Embryo genome profiling by single-cell sequencing for preimplantation genetic diagnosis in a β-thalassemia family

    DEFF Research Database (Denmark)

    Xu, Yanwen; Chen, Shengpei; Yin, Xuyang

    2015-01-01

    for a β-thalassemia-carrier couple to have a healthy second baby. We carried out sequencing for single blastomere cells and the family trio and further developed the analysis pipeline, including recovery of the missing alleles, removal of the majority of errors, and phasing of the embryonic genome...... leukocyte antigen matching tests. CONCLUSIONS: This retrospective study in a β-thalassemia family demonstrates a method for embryo genome recovery through single-cell sequencing, which permits detection of genetic variations in preimplantation genetic diagnosis. It shows the potential of single...

  18. PECULIARITIES OF HLA-PHENOTYPES IN PATIENTS WITH PYELONEPHRITIS

    Directory of Open Access Journals (Sweden)

    Haiseniuk F

    2016-12-01

    Full Text Available Introduction. Of great interest are the studies on the role of human leucocyte antigens (HLA in pathogenesis of a disease. The kidneys is vulnerable to injury in the context of inflammatory responses, with the potential involvement of a number of different inflammatory processes. There are shown the associative links of the HLA antigens which stipulate the relative and attributive risks of some autoimmune diseases, with immune disorder and high production of pro-inflammatory cytokines, that confirms their important role in immunopathogenesis. The aim was to determine the value of some HLA in the development of such important desease as pyelo- and glomerulonephritis. Material and Methods. The distribution of HLA-A, B, DR antigens in 364 patients with kidney diseases (120 – pyelonephritis and 244 - glomerulonephritis was analyzed. HLA antigens were defined using a standard microlymphocytotoxic test on the Terasakiґs planchette with special panels of anti-HLA serums (20 antigens of locus A, 31 – B and 9 – DR. The control group consisted of 350 healthy donors – students from Kiev. The HLA antigen frequencies in normal and deseased subjects were compared taking each antigen separately, using χ2 test. The etiologic fraction (attributive risk  more 0.1 was counted using the formula:  = (x - y/(I- y, where x is frequency of antigen in patients and y – frequency in healthy. The  reading was considered reliable when it exceeded 0.1. Results and discussion. It is advisable to associate PN are А10, А11, В14, В16 и В17 (RR > 2; the causal role (σ > 0.1 was determined for А10, А11, В14, В16; antigens-protectors - А2, В21, В35, В40. Associated with CGN, NS (RR > 2 are with antigens HLA- A23, 24, 28; B8, 38, 44 in patients; the causal role (σ > 0.1 was determined for A24, 28; B8; antigens-protectors – B12, B16. The analysis of the associative features of HLA-phenotype and identified pathogens in patients with PN is carried

  19. HLA Immune Function Genes in Autism

    Directory of Open Access Journals (Sweden)

    Anthony R. Torres

    2012-01-01

    Full Text Available The human leukocyte antigen (HLA genes on chromosome 6 are instrumental in many innate and adaptive immune responses. The HLA genes/haplotypes can also be involved in immune dysfunction and autoimmune diseases. It is now becoming apparent that many of the non-antigen-presenting HLA genes make significant contributions to autoimmune diseases. Interestingly, it has been reported that autism subjects often have associations with HLA genes/haplotypes, suggesting an underlying dysregulation of the immune system mediated by HLA genes. Genetic studies have only succeeded in identifying autism-causing genes in a small number of subjects suggesting that the genome has not been adequately interrogated. Close examination of the HLA region in autism has been relatively ignored, largely due to extraordinary genetic complexity. It is our proposition that genetic polymorphisms in the HLA region, especially in the non-antigen-presenting regions, may be important in the etiology of autism in certain subjects.

  20. Factors Influencing the Decision-Making Process and Long-Term Interpersonal Outcomes for Parents Who Undergo Preimplantation Genetic Diagnosis for Fanconi Anemia: a Qualitative Investigation.

    Science.gov (United States)

    Haude, K; McCarthy Veach, P; LeRoy, B; Zierhut, H

    2017-06-01

    Fanconi anemia (FA) is characterized by congenital malformations, progressive bone marrow failure, and predisposition to malignancy. Hematopoietic stem cell transplantation is used to treat FA, and best results are attained with sibling donors who are human leukocyte antigen (HLA) identical matches. Preimplantation genetic diagnosis (PGD) offers parents of an affected child the opportunity to have an unaffected child who is an HLA match. While some research has investigated parents' experiences during the PGD process, no published studies specifically address factors influencing their decision-making process and long-term interpersonal outcomes. The aims of this study are to: (1) examine parents' expectations and the influence of media, bioethics, and religion on their decision to undergo PGD; (2) examine parents' social support and emotional experiences during their PGD process; and (3) characterize long-term effects of PGD on relationship dynamics (partner, family, friends), others' attitudes, and parental regret. Nine parents participated in semi-structured interviews. Thematic analysis revealed their decision to use PGD was variously influenced by media, bioethics, and religion, in particular, affecting parents' initial confidence levels. Moreover, the PGD process was emotionally complex, with parents desiring varying amounts and types of support from different sources at different times. Parents reported others' attitudes towards them were similar or no different than before PGD. Parental regret regarding PGD was negligible. Results of this study will promote optimization of long-term care for FA families.

  1. A study on HLA-DP gene crossmatching test with PCR-fingerprinting by introducing a monkey′s DPB-like gene%用猴的类DPB基因诱导的PCR指纹图对HLA-DP基因快速相容性测定

    Institute of Scientific and Technical Information of China (English)

    沈仲毅; 沈天伟; 张庆华; 陆佩华; 周光炎; 孙宜

    2001-01-01

    目的将PCR指纹图用于个体间HLA-DP的基因水平交叉配型,确定供-受体间DPB基因的相容性。方法引入猴的类DPB等位基因的扩增产物作通用性异源双链生成物(UHG),使原不能产生PCR指纹图的DPB基因扩增产物在非变性PAGE中显示特定的“卫星条带”,从而可用于供-受体间HLA-DP基因的相容性测定。结果 11株HLA纯合的B淋巴细胞系和随机个体进行PCR-DPB指纹图及交叉配型分析,能敏感地反映个体间DP基因的差异,特别是在纯合子DPB*0201和杂合子DPB*0402/0501中初步发现了可能存在着未能被PCR-RFLP区分的新的亚型或新的等位基因,但是尚不能区分DPB*0201和DPB*0402两个等位基因,有待今后进一步探索。结论初步表明该技术可有效判别供-受体DPB基因匹配性,并有简单、快速等优点。%Objective To determinate HLA-DPB gene compatibility between donors and recipients by HLA-DPB gene crossmatching with PCR-fingerprinting. Methods By introducing a PCR product of monkey′s DPB-like gene as a universal heteroduplex generator (UHG), each PCR product of HLA-DPB allele that does not generate heteroduplexes originally in the non-denatured PAGE can form some specific “satellite” bands which are used to determine the compatibility of HLA-DP allele by crossmatching with PCR-fingerprinting. Results The study shows in HLA either 11 homozygous BLCLs or heterozygous individuals, the crossmatching analysis with PCR-fingerprinting can distinguish the HLA-DP differences between individuals sensitively and also find some challenging results primarily in the homozygous DPB*0201 BLCLs and heterozygous DPB*0402/0501 individuals. However the difference between DPB*0201 allele and DPB*0402 allele is still distinguished. Conclusion PCR-fingerprinting is simple and rapid method in determining the HLA-DP compatibility between donors and recipients at genetic level.

  2. Low utilization of prenatal and pre-implantation genetic diagnosis in Huntington disease - risk discounting in preventive genetics.

    Science.gov (United States)

    Schulman, J D; Stern, H J

    2015-09-01

    Huntington disease (HD) is a late-onset, fatal neurodegenerative disorder caused by a (CAG) triplet repeat expansion in the Huntingtin gene that enlarges during male meiosis. In 1996 in this journal, one of us (J. D. S.) presented a methodology to perform pre-implantation genetic diagnosis in families at-risk for HD without revealing the genetic status of the at-risk parent. Despite the introduction of accurate prenatal and pre-implantation genetic testing which can prevent transmission of the abnormal HD gene in the family permanently, utilization of these options is extremely low. In this article, we examine the decision-making process regarding genetic testing in families with HD and discuss the possible reasons for the low uptake among this group.

  3. HLA dosage effect in narcolepsy with cataplexy.

    Science.gov (United States)

    van der Heide, Astrid; Verduijn, Willem; Haasnoot, Geert W; Drabbels, Jos J M; Lammers, Gert J; Claas, Frans H J

    2015-01-01

    Narcolepsy with cataplexy is a sleep disorder caused by the loss of hypocretin-producing neurons in the hypothalamus. It is tightly associated with a specific human leukocyte antigen (HLA)-allele: HLA-DQB1*06:02. Based on this, an autoimmune process has been hypothesized. A functional HLA-DQ molecule consists of a DQα and a DQβ chain. HLA-DQB1*06:02 (DQβ) has a strong preference for binding to HLA-DQA1*01:02 (DQα), and together they form the functional DQ0602 dimer. A dosage effect would be expected if the HLA-DQ0602 dimer itself is directly involved in the aetiology. An increased expression of the HLA-DQ0602 dimer is expected in individuals homozygous for HLA-DQB1*06:02-DQA1*01:02, but is also hypothesized in individuals heterozygous for HLA-DQB1*06:02 and homozygous for HLA-DQA1*01:02. To study the impact of the expression of the HLA-DQ0602 dimer on narcolepsy susceptibility, 248 Dutch narcolepsy patients and 1272 Dutch control subjects, all of them positive for DQB1*06:02 (heterozygous and homozygous), were HLA-genotyped with attention not only to DQB1 but also to DQA1*01:02. DQB1*06:02-DQA1*01:02 homozygosity was significantly more often seen in patients compared to controls (O.R. 2.29) confirming previous observations. More importantly, a significantly higher prevalence of homozygosity for DQA1*01:02 was found in HLA-DQB1*06:02 heterozygous patients compared to controls (O.R. 2.37, p < 0.001). The latter finding clearly supports a direct role of the HLA-DQ molecule in the development of disease.

  4. Expression of microRNAs in bovine and human pre-implantation embryo culture media

    Directory of Open Access Journals (Sweden)

    Jenna eKropp

    2014-04-01

    Full Text Available MicroRNAs (miRNA are short non-coding RNAs which act to regulate expression of genes driving numerous cellular processes. These RNAs are secreted within exosomes from cells into the extracellular environment where they may act as signaling molecules. In addition, they are relatively stable and are specifically expressed in association to certain cancers making them strong candidates as biological markers. Moreover, miRNAs have been detected in body fluids including urine, milk, saliva, semen, and blood plasma. However, it is unknown whether they are secreted by embryonic cells into the culture media. Given that miRNAs are expressed throughout embryonic cellular divisions and embryonic genome activation, we hypothesized that they are secreted from the embryo into the extracellular environment and may play a role in the developmental competence of bovine embryos. To test this hypothesis, bovine embryos were cultured individually from day 5 to day 8 of development in an in vitro fertilization system and gene expression of 5 miRNAs was analyzed in both embryos and culture media. Differential miRNA gene expression was observed between embryos that developed to the blastocyst stage and those that failed to develop from the morula to blastocyst stage, deemed degenerate embryos. MiR-25, mir-302c, miR-196a2, and miR-181a expression was found to be higher in degenerate embryos compared to blastocyst embryos. Interestingly, these miRNAs were also found to be expressed in the culture media of both bovine and human pre-implantation embryos. Overall, our results show for the first time that miRNAs are secreted from pre-implantation embryos into culture media and that miRNA expression may correlate with developmental competence of the embryo. Expression of miRNAs in in vitro culture media could allow for the development of biological markers for selection of better quality embryos and for subsequent successful pregnancy.

  5. Detrimental effects of microgravity on mouse preimplantation development in vitro.

    Directory of Open Access Journals (Sweden)

    Sayaka Wakayama

    Full Text Available Sustaining life beyond Earth either on space stations or on other planets will require a clear understanding of how the space environment affects key phases of mammalian reproduction. However, because of the difficulty of doing such experiments in mammals, most studies of reproduction in space have been carried out with other taxa, such as sea urchins, fish, amphibians or birds. Here, we studied the possibility of mammalian fertilization and preimplantation development under microgravity (microG conditions using a three-dimensional (3D clinostat, which faithfully simulates 10(-3 G using 3D rotation. Fertilization occurred normally in vitro under microG. However, although we obtained 75 healthy offspring from microG-fertilized and -cultured embryos after transfer to recipient females, the birth rate was lower than among the 1G controls. Immunostaining demonstrated that in vitro culture under microG caused slower development and fewer trophectoderm cells than in 1G controls but did not affect polarization of the blastocyst. These results suggest for the first time that fertilization can occur normally under microG environment in a mammal, but normal preimplantation embryo development might require 1G.

  6. Expression of estrogen receptor alpha in preimplantation mice embryos

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    Objective:To study the expression of estrogen receptor alpha (ERα) in preimplantation mice embryos.Methods:Mice zygotes were collected from superovulated Kunming mice and cultured in vitro.Embryos at different developmental stages were collected at 0,24,36,48,72 and 96hours after cultivation.The expression of ERα in early mice embryos was detected by reverse transcription-PCR (RT-PCR) and immunocytochemistry.Results:The expression of ERα mRNA was detected in all of the examined embryonic stages.The relative amount of ERα mRNA showed no significant difference between 1-cell stage embryos and 4-cell stage embryos (P>0.05).However,the relative level of ERα mRNA significantly decreased (P<0.05) at 2-cell stage and was the lowest at this stage.Over 2-cell stage,the ERα mRNA relative level would increase and achieve the peak level at blastocyst stage.The location of immunocytochemistry showed that ERα immunopositive cells could be firstly detected at 8-cell stage,after which they are consistently detected until blastocyst stage.In addition,the intensity of ERα positive staining was higher at blastocyst stage compared with that at 8-cell stage and morula stage.Conclusion:ERα is expressed in preimplantation mice embryos in a temporal and spatial pattern and may be involved in regulating the development of early mice embryos,which probably plays crucial roles in early embryonic development.

  7. HLA-B27-Homodimer-Specific Antibody Modulates the Expansion of Pro-Inflammatory T-Cells in HLA-B27 Transgenic Rats.

    Directory of Open Access Journals (Sweden)

    Osiris Marroquin Belaunzaran

    Full Text Available HLA-B27 is a common genetic risk factor for the development of Spondyloarthritides (SpA. HLA-B27 can misfold to form cell-surface heavy chain homodimers (B272 and induce pro-inflammatory responses that may lead to SpA pathogenesis. The presence of B272 can be detected on leukocytes of HLA-B27+ Ankylosing spondylitis (AS patients and HLA-B27 transgenic rats. We characterized a novel B272-specific monoclonal antibody to study its therapeutic use in HLA-B27 associated disorders.The monoclonal HD5 antibody was selected from a phage library to target cell-surface B272 homodimers and characterized for affinity, specificity and ligand binding. The immune modulating effect of HD5 was tested in HLA-B27 transgenic rats. Onset and progression of disease profiles were monitored during therapy. Cell-surface B272 and expansion of pro-inflammatory cells from blood, spleen and draining lymph nodes were assessed by flow cytometry.HD5 bound B272 with high specificity and affinity (Kd = 0.32 nM. HD5 blocked cell-surface interaction of B272 with immune regulatory receptors KIR3DL2, LILRB2 and Pirb. In addition, HD5 modulated the production of TNF from CD4+ T-cells by limiting B272 interactions in vitro. In an HLA-B27 transgenic rat model repetitive dosing of HD5 reduced the expansion of pro-inflammatory CD4+ T-cells, and decreased the levels of soluble TNF and number of cell-surface B272 molecules.HD5 predominantly inhibits early TNF production and expansion of pro-inflammatory CD4+ T-cells in HLA-B27 transgenic rats. Monoclonal antibodies targeting cell-surface B272 propose a new concept for the modulation of inflammatory responses in HLA-B27 related disorders.

  8. The HLA-net GENE[RATE] pipeline for effective HLA data analysis and its application to 145 population samples from Europe and neighbouring areas.

    Science.gov (United States)

    Nunes, J M; Buhler, S; Roessli, D; Sanchez-Mazas, A

    2014-05-01

    In this review, we present for the first time an integrated version of the Gene[rate] computer tools which have been developed during the last 5 years to analyse human leukocyte antigen (HLA) data in human populations, as well as the results of their application to a large dataset of 145 HLA-typed population samples from Europe and its two neighbouring areas, North Africa and West Asia, now forming part of the Gene[va] database. All these computer tools and genetic data are, from now, publicly available through a newly designed bioinformatics platform, HLA-net, here presented as a main achievement of the HLA-NET scientific programme. The Gene[rate] pipeline offers user-friendly computer tools to estimate allele and haplotype frequencies, to test Hardy-Weinberg equilibrium (HWE), selective neutrality and linkage disequilibrium, to recode HLA data, to convert file formats, to display population frequencies of chosen alleles and haplotypes in selected geographic regions, and to perform genetic comparisons among chosen sets of population samples, including new data provided by the user. Both numerical and graphical outputs are generated, the latter being highly explicit and of publication quality. All these analyses can be performed on the pipeline after scrupulous validation of the population sample's characterisation and HLA typing reporting according to HLA-NET recommendations. The Gene[va] database offers direct access to the HLA-A, -B, -C, -DQA1, -DQB1, -DRB1 and -DPB1 frequencies and summary statistics of 145 population samples having successfully passed these HLA-NET 'filters', and representing three European subregions (South-East, North-East and Central-West Europe) and two neighbouring areas (North Africa, as far as Sudan, and West Asia, as far as South India). The analysis of these data, summarized in this review, shows a substantial genetic variation at the regional level in this continental area. These results have main implications for population genetics

  9. HLA-A, HLA-B, and HLA-DRB1 allele distribution in a large Armenian population sample.

    Science.gov (United States)

    Matevosyan, L; Chattopadhyay, S; Madelian, V; Avagyan, S; Nazaretyan, M; Hyussian, A; Vardapetyan, E; Arutunyan, R; Jordan, F

    2011-07-01

    Human leukocyte antigen (HLA)-A, HLA-B, and HLA-DRB1 gene frequencies were investigated in 4279 unrelated Armenian bone marrow donors. HLA alleles were defined by using PCR amplification with sequence specific primers (PCR-SSP) high- and low-resolution kits. The aim of this study was to examine the HLA diversity at the high-resolution level in a large Armenian population sample, and to compare HLA allele group distribution in Armenian subpopulations. The most frequently observed alleles in the HLA class I were HLA-A*0201, A*0101, A*2402, A*0301, HLA-B*5101, HLA-B*3501, and B*4901. Among DRB1 alleles, high frequencies of DRB1*1104 and DRB1*1501 were observed, followed by DRB1*1101 and DRB1*1401. The most common three-locus haplotype found in the Armenian population was A*33-B*14-DRB1*01, followed by A*03-B*35-DRB1*01. Our results show a similar distribution of alleles in Armenian subpopulations from different countries, and from different regions of the Republics of Armenia and Karabagh. The low level of genetic distances between subpopulations indicates a high level of population homogeneity, and the genetic distances between Armenians and other populations show Armenians as a distinct ethnic group relative to others, reflecting the fact that Armenians have been an 'isolated population' throughout centuries. This study is the first comprehensive investigation of HLA-allele group distribution in a subset of Armenian populations, and the first to provide HLA-allele and haplotype frequencies at a high-resolution level. It is a valuable reference for organ transplantation and for future studies of HLA-associated diseases in Armenian populations.

  10. HLA-G polymorphisms and HLA-G expression in sarcoidosis

    DEFF Research Database (Denmark)

    Hviid, TVF; Milman, N; Hylenius, S;

    2006-01-01

    BACKGROUND: The MHC class Ib molecule Human Leukocyte Antigen (HLA)-G may be important in induction and maintenance of immunological tolerance, and HLA-G expression may have a role in different cancers, in certain diseases with associations to HLA, and in organ transplantation. Sarcoidosis...... is a systemic granulomatous disease with unknown etiology but at the molecular level several studies have shown HLA associations. METHODS: In the present study, HLA-G alleles/polymorphisms were studied in sarcoidosis patients (n = 47) and controls (n = 129) by PCR techniques and HLA-G protein expression...

  11. GWAS signals across the HLA regions: revealing a clue for common etiology underlying infectious tumors and other immunity diseases

    Institute of Scientific and Technical Information of China (English)

    Yin Yao Shugart; Ying Wang; Wei-Hua Jia; Yi-Xin Zeng

    2011-01-01

    Increasing evidence suggests that multiple genes in the human leukocyte antigen (HLA) regions play an important role in development of cancers and immunity disorders. However, the biological mechanisms of the HLA associations are not well understood. We recently conducted a survey of all genome-wide association studies (GWAS) with significant findings in the HLA regions and concluded that diseases such as cancer and immune disorders are more likely to be associated with genetic variants located in the HLA regions than other diseases. This finding is suggestive for testing a hypothesis of a common etiology of infectious tumors and other immunity diseases.

  12. The HLA-A*31:01 allele: influence on carbamazepine treatment

    Science.gov (United States)

    Yip, Vincent Lai Ming; Pirmohamed, Munir

    2017-01-01

    Carbamazepine (CBZ) is an effective anticonvulsant that can sometimes cause hypersensitivity reactions that vary in frequency and severity. Strong associations have been reported between specific human leukocyte antigen (HLA) alleles and susceptibility to CBZ hypersensitivity reactions. Screening for HLA-B*15:02 is mandated in patients from South East Asia because of a strong association with Stevens–Johnson syndrome (SJS) and toxic epidermal necrolysis (TEN). HLA-A*31:01 predisposes to multiple phenotypes of CBZ hypersensitivity including maculopapular exanthema, hypersensitivity syndrome, and SJS/TEN in a range of populations including Europeans, Japanese, South Koreans and Han Chinese, although the effect size varies between the different phenotypes and populations. Between 47 Caucasians and 67 Japanese patients would need to be tested for HLA-A*31:01 in order to avoid a single case of CBZ hypersensitivity. A cost-effectiveness study has demonstrated that HLA-A*31:01 screening would be cost-effective. Patient preference assessment has also revealed that patients prefer pharmacogenetic screening and prescription of alternative anticonvulsants compared to current standard of practice without pharmacogenetic testing. For patients who test positive for HLA-A*31:01, alternative treatments are available. When alternatives have failed or are unavailable, HLA-A*31:01 testing can alert clinicians to 1) patients who are at increased risk of CBZ hypersensitivity who can then be targeted for more intensive monitoring and 2) increase diagnostic certainty in cases where hypersensitivity has already occurred, so patients can be advised to avoid structurally related drugs in the future. On the basis of the current evidence, we would favor screening all patients for HLA-A*31:01 and HLA-B*15:02 prior to starting CBZ therapy. PMID:28203102

  13. LILRB2 interaction with HLA class I correlates with control of HIV-1 infection.

    Directory of Open Access Journals (Sweden)

    Arman A Bashirova

    2014-03-01

    Full Text Available Natural progression of HIV-1 infection depends on genetic variation in the human major histocompatibility complex (MHC class I locus, and the CD8+ T cell response is thought to be a primary mechanism of this effect. However, polymorphism within the MHC may also alter innate immune activity against human immunodeficiency virus type 1 (HIV-1 by changing interactions of human leukocyte antigen (HLA class I molecules with leukocyte immunoglobulin-like receptors (LILR, a group of immunoregulatory receptors mainly expressed on myelomonocytic cells including dendritic cells (DCs. We used previously characterized HLA allotype-specific binding capacities of LILRB1 and LILRB2 as well as data from a large cohort of HIV-1-infected individuals (N = 5126 to test whether LILR-HLA class I interactions influence viral load in HIV-1 infection. Our analyses in persons of European descent, the largest ethnic group examined, show that the effect of HLA-B alleles on HIV-1 control correlates with the binding strength between corresponding HLA-B allotypes and LILRB2 (p = 10(-2. Moreover, overall binding strength of LILRB2 to classical HLA class I allotypes, defined by the HLA-A/B/C genotypes in each patient, positively associates with viral replication in the absence of therapy in patients of both European (p = 10(-11-10(-9 and African (p = 10(-5-10(-3 descent. This effect appears to be driven by variations in LILRB2 binding affinities to HLA-B and is independent of individual class I allelic effects that are not related to the LILRB2 function. Correspondingly, in vitro experiments suggest that strong LILRB2-HLA binding negatively affects antigen-presenting properties of DCs. Thus, we propose an impact of LILRB2 on HIV-1 disease outcomes through altered regulation of DCs by LILRB2-HLA engagement.

  14. Multi-population classical HLA type imputation.

    Directory of Open Access Journals (Sweden)

    Alexander Dilthey

    Full Text Available Statistical imputation of classical HLA alleles in case-control studies has become established as a valuable tool for identifying and fine-mapping signals of disease association in the MHC. Imputation into diverse populations has, however, remained challenging, mainly because of the additional haplotypic heterogeneity introduced by combining reference panels of different sources. We present an HLA type imputation model, HLA*IMP:02, designed to operate on a multi-population reference panel. HLA*IMP:02 is based on a graphical representation of haplotype structure. We present a probabilistic algorithm to build such models for the HLA region, accommodating genotyping error, haplotypic heterogeneity and the need for maximum accuracy at the HLA loci, generalizing the work of Browning and Browning (2007 and Ron et al. (1998. HLA*IMP:02 achieves an average 4-digit imputation accuracy on diverse European panels of 97% (call rate 97%. On non-European samples, 2-digit performance is over 90% for most loci and ethnicities where data available. HLA*IMP:02 supports imputation of HLA-DPB1 and HLA-DRB3-5, is highly tolerant of missing data in the imputation panel and works on standard genotype data from popular genotyping chips. It is publicly available in source code and as a user-friendly web service framework.

  15. Selective changes in expression of HLA class I polymorphic determinants in human solid tumors

    Energy Technology Data Exchange (ETDEWEB)

    Natali, P.G.; Nicotra, M.R.; Bigotti, A.; Venturo, I.; Giacomini, P. (Regina Elena Cancer Institute, Rome (Italy)); Marcenaro, L.; Russo, C. (Cornell Univ. Medical College, New York, NY (USA))

    1989-09-01

    Analysis of surgical biopsies with monoclonal antibodies (mAbs) to framework determinants of major histocompatibility complex class I antigens has shown that malignant transformation is frequently associated with a marked loss of these cell surface molecules. The present study sought to determine whether more selective losses of major histocompatibility complex class I expression occur. Multiple specimens from 13 different types of primary and metastatic tumors were tested utilizing mAb BB7.2, which recognizes a polymorphic HLA-A2 epitope. In each case, expression of HLA-A,B,C molecules was determined by testing with mAb W6/32 directed to a framework HLA class I determinant. The authors have found that in HLA-A2-positive patients, HLA-A2 products are not detectable or are reduced in their expression in 70-80% of endometrial, colorectal, mammary, and renal tumors; in 40-60% of soft-tissue, skin, ovary, urinary bladder, prostate, and stomach tumors; and in 25-30% of melanomas and lung carcinomas tested. All tumors expressed the framework HLA-A,B.C determinant. The HLA-A2 epitope recognized by mAb BB7.2 is located in a portion of the HLA-A2 molecule postulated to react with the T-cell receptor. The selective loss of an HLA class I polymorphic epitope shown in this study may explain the mechanism by which tumor cells escape both T-cell recognition and natural killer cell surveillance.

  16. Completion of HLA protein sequences by automated homology-based nearest-neighbor extrapolation of HLA database sequences

    NARCIS (Netherlands)

    Geneugelijk, K; Niemann, M; de Hoop, T; Spierings, E

    The IMGT/HLA database contains every publicly available HLA sequence. However, most of these HLA protein sequences are restricted to the alpha-1/alpha-2 domain for HLA class-I and alpha-1/beta-1 domain for HLA class-II. Nevertheless, also polymorphism outside these domains may play a role in

  17. Preimplantation genetic diagnosis (PGD) for Huntington's disease: the experience of three European centres.

    Science.gov (United States)

    Van Rij, Maartje C; De Rademaeker, Marjan; Moutou, Céline; Dreesen, Jos C F M; De Rycke, Martine; Liebaers, Inge; Geraedts, Joep P M; De Die-Smulders, Christine E M; Viville, Stéphane

    2012-04-01

    This study provides an overview of 13 years of experience of preimplantation genetic diagnosis (PGD) for Huntington's disease (HD) at three European PGD centres in Brussels, Maastricht and Strasbourg. Information on all 331 PGD intakes for HD, couples' reproductive history, PGD approach, treatment cycles and outcomes between 1995 and 2008 were collected prospectively. Of 331 couples for intake, 68% requested direct testing and 32% exclusion testing (with a preponderance of French couples). At the time of PGD intake, 39% of women had experienced one or more pregnancies. A history of pregnancy termination after prenatal diagnosis was observed more frequently in the direct testing group (25%) than in the exclusion group (10%; P=0.0027). PGD workup was based on two approaches: (1) direct testing of the CAG-triplet repeat and (2) linkage analysis using intragenic or flanking microsatellite markers of the HTT gene. In total, 257 couples had started workup and 174 couples (70% direct testing, 30% exclusion testing) completed at least one PGD cycle. In total, 389 cycles continued to oocyte retrieval (OR). The delivery rates per OR were 19.8%, and per embryo transfer 24.8%, resulting in 77 deliveries and the birth of 90 children. We conclude that PGD is a valuable and safe reproductive option for HD carriers and couples at risk of transmitting HD.

  18. DIFFERENTIAL IMPACT OF HLA-A, HLA-B AND HLA-DR COMPATIBILITY ON THE RENAL ALLOGRAFT SURVIVAL

    OpenAIRE

    V. Y. Abramov; Y. G. Moysyuk; N. N. Kaluzhina; N. B. Bogdanova; V. V. Morozova; N. V. Apanasenko

    2012-01-01

    We studied the long-term results of 532 deceased donor kidney transplantations to investigate the impact of HLA match on the survival of renal allograft. All transplants were performed in our center in 1996–2009 and moni- tored prospectively for 1–14 years. We found, the survival of 58 kidneys grafted with 0–2 mismatch for HLA- ABDR to be significantly better (Plogrank = 0,016) than the survival of the kidneys grafted with 3–6 HLA-ABDR mismatch. The full compatibility for HLA-A (n = 75) did n...

  19. Conflicting HLA assignment by three different typing methods due to the apparent loss of heterozygosity in the MHC region.

    Science.gov (United States)

    Linjama, T; Impola, U; Niittyvuopio, R; Kuittinen, O; Kaare, A; Rimpiläinen, J; Volin, L; Peräsaari, J; Jaatinen, T; Lauronen, J; Saarinen, T; Juvonen, E; Partanen, J; Koskela, S

    2016-05-01

    Loss of heterozygosity (LOH) has been reported to cause false human leukocyte antigen (HLA) homozygous typing results in pre-transplant patients suffering from haematological malignancies, who in fact are HLA heterozygous. This poses a challenge for histocompatibility testing, as a stem cell graft from a genuinely HLA homozygous donor to a mistyped patient may lead to acute life-threatening graft-vs-host disease. LOH in the HLA region on chromosome 6 is known to be quite common in solid tumours, helping malignant cells to escape T-cell surveillance, but the incidence in haematological malignancies is less well known and the estimates vary. Here we report LOH in the HLA region of five patients with haematological malignancy. We found considerable differences in sensitivity between the three different HLA typing methods used in our laboratory: SSP was clearly the most sensitive method for detecting the lost haplotype, followed by rSSO, while SBT was the least sensitive technique. A subsequent, retrospective genotyping of 65 HLA homozygous haematological patients by SSP method showed no mistyped LOH cases in our laboratory in the past 10 years. The frequency of HLA homozygosity was found to be similar between haematological patients and control groups. It is important for an HLA laboratory to be aware of the differences in various HLA typing techniques' sensitivity for detecting an under-represented haplotype between HLA typing techniques when genotyping patients with haematological diseases. It is advisable for HLA laboratories to have at least two different methods with different sensitivities in their repertoire to be able to retype samples when a false homozygous result is suspected.

  20. The effect of progesterone and 17-β estradiol on membrane-bound HLA-G in adipose derived stem cells.

    Science.gov (United States)

    Moslehi, Akram; Hashemi-Beni, Batool; Moslehi, Azam; Akbari, Maryam Ali; Adib, Minoo

    2016-07-01

    Membrane-bound HLA-G (mHLA-G) discovery on adipose derived stem cells (ADSCs) as a tolerogenic and immunosuppressive molecule was very important. Many documents have shown that HLA-G expression can be controlled via some hormones such as progesterone (P4) and estradiol (E2). Therefore, this study was designed to evaluate progesterone and estradiol effects on mHLA-G in ADSCs at restricted and combination concentrations. Three independent cell lines were cultured in complete free phenol red DMEM and subcultured to achieve suffi cient cells. These cells were treated with P4, E2 and P4 plus E2 at physiologic and pregnancy concentrations for 3 days in cell culture conditions. The HLA-G positive ADSCs was measured via monoclonal anti HLA-G-FITC/MEMG-09 by means of flow cytometry in nine groups. Data were analyzed by one way ANOVA and Tukey's post hoc tests. There were no signifi cant values of the mean percentage of HLA-G positive cells in E2-treated and the combination of P4 plus E2-treated ADSCs compared to control cells (p value>0.05) but P4 had a signifi cant increase on mHLA-G in ADSCs (p valueG but E2 and the combination of P4 plus E2 could not change mHLA-G on ADSCs.

  1. HLA class II (DR, DQ, DP) in patients with sarcoidosis: evidence of an increased frequency of DRw6

    DEFF Research Database (Denmark)

    Ødum, Niels; Milman, N; Jakobsen, B K

    1991-01-01

    The distribution of HLA class II (DR, DQ, and DP) antigens was studied in 41 patients with symptomatic sarcoidosis (SA) and ethnically matched healthy controls. HLA-DR, -DQw1 and -DQw3 typings were performed with alloantisera in the conventional microcytotoxic test, whereas -DP typings were done...

  2. HLA-DRB GENES POLYMORPHISM IN CHINESE NORTHERN PATIENTS WITH ATOPIC ASTHMA

    Institute of Scientific and Technical Information of China (English)

    高金明; 林耀广; 邱长春; 马毅

    1998-01-01

    Objective. Atopie asthma provides a usetul model for evaluating the genetic tactors that control human immune responsiveness. HLA class Ⅱ gene products are involved in the control of immune response. As HLA-DRB gene is the most polymorphic HLA class Ⅱ gene, we investigated whether susceptibility or resistance to the disease is associated with HLA-DRB. Methods. Blood samples were obtained from two groups of unrelated Chinese northern adults: (1) 50 atopic asthma (7 of them with familial aggregation) ; (2) 80 healthy controls without asthma or atopy and other HLA-associated diseases. Genomic DNA was extracted from peripheral venous blood leucocytes. The polymorphie second exon of HLA-DRB gene was amplified by sequence-specific primer polymerase chain reaction (SSP/PCR) methods. All patients had their serum IgE(total and spscifie) antibody levels by RAST, bronchial reactivity assessed by methaeholine brocho-provocation test and/or hronchodilation test. Results.There was an increased gene frequency of DR52 and DR52 in asthmatic subjects compared with healthy subjects(17% vs 4.3%, P<0. 01% 50% vs 17.5%, P<0. 01), and the decreased frequency of DR2(15) and DR52 in asthmatic patients(7% vs 18%, P<0. 05; 2% vs 33%, P<0. 01). We found the positive association between DR5(13)-DR52 and sIgE antibody responsiveness to d1 (from house dust mite allergen ); negative association between HLA-DRB alleles and TIgE or BHR ( bronchial hyperresponsiveness). Conclusion. The results suggested that HLA haplotype DR6(13)-DR52 was significantly implicated in suseeptibility to house dust mite induced-asthma, at least it would he more closely assocaated with atopic asthms. Conversely, alleles DR2(15) and DR51 might corder protection against the disease. HLA-DRB genes were particularly involved in regulating human atopie immune response in asthma.

  3. High-Accuracy HLA Type Inference from Whole-Genome Sequencing Data Using Population Reference Graphs.

    Directory of Open Access Journals (Sweden)

    Alexander T Dilthey

    2016-10-01

    Full Text Available Genetic variation at the Human Leucocyte Antigen (HLA genes is associated with many autoimmune and infectious disease phenotypes, is an important element of the immunological distinction between self and non-self, and shapes immune epitope repertoires. Determining the allelic state of the HLA genes (HLA typing as a by-product of standard whole-genome sequencing data would therefore be highly desirable and enable the immunogenetic characterization of samples in currently ongoing population sequencing projects. Extensive hyperpolymorphism and sequence similarity between the HLA genes, however, pose problems for accurate read mapping and make HLA type inference from whole-genome sequencing data a challenging problem. We describe how to address these challenges in a Population Reference Graph (PRG framework. First, we construct a PRG for 46 (mostly HLA genes and pseudogenes, their genomic context and their characterized sequence variants, integrating a database of over 10,000 known allele sequences. Second, we present a sequence-to-PRG paired-end read mapping algorithm that enables accurate read mapping for the HLA genes. Third, we infer the most likely pair of underlying alleles at G group resolution from the IMGT/HLA database at each locus, employing a simple likelihood framework. We show that HLA*PRG, our algorithm, outperforms existing methods by a wide margin. We evaluate HLA*PRG on six classical class I and class II HLA genes (HLA-A, -B, -C, -DQA1, -DQB1, -DRB1 and on a set of 14 samples (3 samples with 2 x 100bp, 11 samples with 2 x 250bp Illumina HiSeq data. Of 158 alleles tested, we correctly infer 157 alleles (99.4%. We also identify and re-type two erroneous alleles in the original validation data. We conclude that HLA*PRG for the first time achieves accuracies comparable to gold-standard reference methods from standard whole-genome sequencing data, though high computational demands (currently ~30-250 CPU hours per sample remain a

  4. High-Accuracy HLA Type Inference from Whole-Genome Sequencing Data Using Population Reference Graphs.

    Science.gov (United States)

    Dilthey, Alexander T; Gourraud, Pierre-Antoine; Mentzer, Alexander J; Cereb, Nezih; Iqbal, Zamin; McVean, Gil

    2016-10-01

    Genetic variation at the Human Leucocyte Antigen (HLA) genes is associated with many autoimmune and infectious disease phenotypes, is an important element of the immunological distinction between self and non-self, and shapes immune epitope repertoires. Determining the allelic state of the HLA genes (HLA typing) as a by-product of standard whole-genome sequencing data would therefore be highly desirable and enable the immunogenetic characterization of samples in currently ongoing population sequencing projects. Extensive hyperpolymorphism and sequence similarity between the HLA genes, however, pose problems for accurate read mapping and make HLA type inference from whole-genome sequencing data a challenging problem. We describe how to address these challenges in a Population Reference Graph (PRG) framework. First, we construct a PRG for 46 (mostly HLA) genes and pseudogenes, their genomic context and their characterized sequence variants, integrating a database of over 10,000 known allele sequences. Second, we present a sequence-to-PRG paired-end read mapping algorithm that enables accurate read mapping for the HLA genes. Third, we infer the most likely pair of underlying alleles at G group resolution from the IMGT/HLA database at each locus, employing a simple likelihood framework. We show that HLA*PRG, our algorithm, outperforms existing methods by a wide margin. We evaluate HLA*PRG on six classical class I and class II HLA genes (HLA-A, -B, -C, -DQA1, -DQB1, -DRB1) and on a set of 14 samples (3 samples with 2 x 100bp, 11 samples with 2 x 250bp Illumina HiSeq data). Of 158 alleles tested, we correctly infer 157 alleles (99.4%). We also identify and re-type two erroneous alleles in the original validation data. We conclude that HLA*PRG for the first time achieves accuracies comparable to gold-standard reference methods from standard whole-genome sequencing data, though high computational demands (currently ~30-250 CPU hours per sample) remain a significant

  5. Reproductive abnormalities in adult male mice following preimplantation exposures to estradiol or pesticide methoxychlor.

    Science.gov (United States)

    Amstislavsky, Sergei Ya; Amstislavskaya, Tamara G; Amstislavsky, Vjacheslav S; Tibeikina, Marina A; Osipov, Kiril V; Eroschenko, Victor P

    2006-02-01

    Adult females of ICR strain of mice were bred, separated into different experimental groups, and treated as follows. On Days 2-4 of pregnancy, the mice received daily subcutaneous injections of either 0.05 ml sesame oil (vehicle) or same volume of 5.0mg of purified methoxychlor (MXC) suspended in the vehicle. Another group received a single subcutaneous injection of 1.0 microg of estradiol-17beta (E) on Day 2 of pregnancy only. Male offspring were tested at 3 and 6 months of age. At 3 months, E or MXC did not alter the weights of seminal vesicles, preputial glands, or testes, although after exposure for 30 min to a female in estrus behind a partition, testosterone levels were significantly reduced in treated males in comparison to control males exposed to the same partition test. At 6 months, the preputial glands and testes weight remained unchanged, while the seminal vesicles were significantly heavier in E- and MXC-treated males. Same partition tests again revealed that in E and MXC groups, testosterone levels remained significantly lower in comparison to control males. MXC or E exposures during preimplantation appear to induce long-term effects on the sexual development in 3 and 6 month-old-males by compromising their sexual arousal and altering seminal vesicles weights in the older group.

  6. [The Cagliari (Italy) Court authorizes the preimplantation genetic diagnosis].

    Science.gov (United States)

    Jorqui Azofra, María

    2007-01-01

    Today, preimplantation genetic diagnosis (PGD) has been greatly accepted within the framework of positive law of many European countries. Nevertheless, in other countries, such as Italy, it is forbidden by law. The ruling of the Civil Court of Cagliari which has authorized its use to a Sardinian couple, has opened, in this way, a small crack to be able to asses possible modifications to the Italian regulation on this matter. This article analyses the ruling of the Civil Court of Cagliari (Italy) from an ethical and legal perspective. The criteria which is used to analyse the legitimacy or illegitimacy of the practice of PGD is analysed. That is, on reasons which could justify or not the transfer of embryos in vitro to the woman. With this objective in mind, the Italian and Spanish normative models which regulates this controversial subject are looked at. As a conclusion, a critical evaluation of the arguments presented is made.

  7. Conservation of DNA Methylation Programming Between Mouse and Human Gametes and Preimplantation Embryos.

    Science.gov (United States)

    White, Carlee R; MacDonald, William A; Mann, Mellissa R W

    2016-09-01

    In mice, assisted reproductive technologies (ARTs) applied during gametogenesis and preimplantation development can result in disruption of genomic imprinting. In humans, these technologies and/or subfertility have been linked to perturbations in genomic imprinting. To understand how ARTs and infertility affect DNA methylation, it is important to understand DNA methylation dynamics and the role of regulatory factors at these critical stages. Recent genome studies performed using mouse and human gametes and preimplantation embryos have shed light onto these processes. Here, we comprehensively review the current state of knowledge regarding global and imprinted DNA methylation programming in the mouse and human. Available data highlight striking similarities in mouse and human DNA methylation dynamics during gamete and preimplantation development. Just as fascinating, these studies have revealed sex-, gene-, and allele-specific differences in DNA methylation programming, warranting future investigation to untangle the complex regulation of DNA methylation dynamics during gamete and preimplantation development.

  8. [Genetic cancer syndromes and reproductive choice: dialogue between parents and politicians on preimplantation genetic diagnosis

    NARCIS (Netherlands)

    Niermeijer, M.F.; Die-Smulders, C.E.M. de; Page-Christiaens, G.C.; Wert, G.M.W.R. de

    2008-01-01

    Genetic cancer syndromes have identical clinical severity, limited therapeutic options, reduced life expectancy, and risks of genetic transmission, as do other genetic or congenital diseases for which prenatal genetic diagnosis or preimplantation genetic diagnosis (PGD) is allowed in the

  9. [Genetic cancer syndromes and reproductive choice: dialogue between parents and politicians on preimplantation genetic diagnosis

    NARCIS (Netherlands)

    Niermeijer, M.F.; Die-Smulders, C.E.M. de; Page-Christiaens, G.C.; Wert, G.M.W.R. de

    2008-01-01

    Genetic cancer syndromes have identical clinical severity, limited therapeutic options, reduced life expectancy, and risks of genetic transmission, as do other genetic or congenital diseases for which prenatal genetic diagnosis or preimplantation genetic diagnosis (PGD) is allowed in the Netherlands

  10. HLA class I donor-specific triplet antibodies detected after renal transplantation.

    Science.gov (United States)

    Varnavidou-Nicolaidou, A; Doxiadis, I I N; Iniotaki-Theodoraki, A; Patargias, T; Stavropoulos-Giokas, C; Kyriakides, G K

    2004-01-01

    The purpose of this study was to investigate whether IgG, non-donor-specific anti-HLA class I antibodies (HLAabI) detected after renal transplantation recognize immunogenic amino acid triplets expressed on the foreign graft. In addition, we sought to evaluate the effect of these antibodies as well as other posttransplant HLAabI on graft outcome. Posttransplant sera from 264 renal recipients were tested for the presence of IgG HLAabI and HLA class II-specific alloantibodies (HLAabII) by ELISA. The HLAMatchmaker computer algorithm was used to define the HLA class I non-donor-specific antibodies, which seem to recognize immunogenic amino acid triplets. Donor-specific triplet antibodies (DSTRab) were detected in 16 of 22 (72.7%) recipients based on at least one HLA-A or -B mismatched antigen with the donor. DSTRab were found either without (n = 7) or with (n = 9) HLA donor-specific antibodies (HLA-DSA). The presence of DSTRab alone in the periphery was associated with acute rejection, whereas the presence of both DSTRab and HLA-DSA was associated with chronic rejection and graft failure.

  11. HLA-G profile of infertile couples who underwent assisted reproduction treatment.

    Science.gov (United States)

    Costa, Cynthia Hernandes; Gelmini, Georgia Fernanda; Nardi, Fabiola Silva; Roxo, Valéria Maria Munhoz Sperandio; Schuffner, Alessandro; da Graça Bicalho, Maria

    2016-12-01

    HLA-G codes for a non-classical class I (Ib) protein which is mainly expressed in trophoblast cells. Many pieces of evidence pointed out its essential role conferring immunological tolerance to the fetus. Some HLA-G alleles have been linked to enhanced or reduced HLA-G protein levels expression, which have been associated with reproductive failure. In this study 33 couples undergoing ART (assisted reproduction treatment; n=66) and 120 couples who conceived naturally (controls; n=240) were enrolled in the study. Genotyping was performed by SBT and tagged an 1837bp at 5'URR as well as exons 2, 3 and4 of HLA-G. Alleles, genotypes and haplotypes were compared between infertile and control groups using Fisher Exact Test. The haplotype HLA-G(∗)010101b/HLA-G(∗)01:01:01 showed statistically significant higher frequency in control groups. The immunogenetics of infertility is complex and might be dependent on different genes involved in the establishment of a successful pregnancy. A better understanding of HLA-G alleles and haplotypes structure and how the genetic diversity at their regulatory sites could impact on their level of expression and build up the susceptibility or protection conditions may shed light on the comprehension of immunogenetics mechanisms acting at the fetus-maternal interface.

  12. [The HLA system and habitual abortion].

    Science.gov (United States)

    Hajek-Rosenmayr, A

    1990-01-01

    HLA-antigens are extremely polymorphic. A calculation of the polymorphism shows a number of 398.476.343 possible HLA-phenotypes, if HLA-A, -B, -C and -DR antigens are taken into account. The compatibility of HLA-antigens of recipient and donor plays a crucial role in transplantation: HLA-antigens are the traits, which are recognized by the immune system of the recipient in the frame of a rejection of the transplant or by the donor in the frame of a graft-versus-host reaction. Large international statistics show that HLA-incompatibility between recipient and donor leads to short transplant function periods, while compatibility brings about good transplant function. Therefore, matching of HLA-antigens plays an important role in transplantation of solid organs, mainly kidneys (3, 4, 5), and is completely necessary in bone marrow transplantation. Also in pregnancy, HLA-antigens are important: If HLA compatibility between mother and child is high, the risk for habitual abortion is higher than in normal pregnancies (6, 7).

  13. Preimplantation genetic diagnosis: state of the art 2011.

    Science.gov (United States)

    Harper, Joyce C; Sengupta, Sioban B

    2012-02-01

    For the last 20 years, preimplantation genetic diagnosis (PGD) has been mostly performed on cleavage stage embryos after the biopsy of 1-2 cells and PCR and FISH have been used for the diagnosis. The main indications have been single gene disorders and inherited chromosome abnormalities. Preimplantation genetic screening (PGS) for aneuploidy is a technique that has used PGD technology to examine chromosomes in embryos from couples undergoing IVF with the aim of helping select the chromosomally 'best' embryo for transfer. It has been applied to patients of advanced maternal age, repeated implantation failure, repeated miscarriages and severe male factor infertility. Recent randomised controlled trials (RCTs) have shown that PGS performed on cleavage stage embryos for a variety of indications does not improve delivery rates. At the cleavage stage, the cells biopsied from the embryo are often not representative of the rest of the embryo due to chromosomal mosaicism. There has therefore been a move towards blastocyst and polar body biopsy, depending on the indication and regulations in specific countries (in some countries, biopsy of embryos is not allowed). Blastocyst biopsy has an added advantage as vitrification of blastocysts, even post biopsy, has been shown to be a very successful method of cryopreserving embryos. However, mosaicism is also observed in blastocysts. There have been dramatic changes in the method of diagnosing small numbers of cells for PGD. Both array-comparative genomic hybridisation and single nucleotide polymorphism arrays have been introduced clinically for PGD and PGS. For PGD, the use of SNP arrays brings with it ethical concerns as a large amount of genetic information will be available from each embryo. For PGS, RCTs need to be conducted using both array-CGH and SNP arrays to determine if either will result in an increase in delivery rates.

  14. Pre-existing anti-HLA antibodies negatively impact survival of pediatric aplastic anemia patients undergoing HSCT.

    Science.gov (United States)

    Zhu, Hua; He, Jun; Cai, Junchao; Yuan, Xiaoni; Jiang, Hua; Luo, Changying; Wang, Jianmin; Luo, Chengjuan; Pan, Zhijuan; Terasaki, Paul I; Ding, Lixia; Chen, Jing

    2014-11-01

    Graft failure and survival are the major problems for patients with aplastic anemia undergoing hematopoietic stem cell transplantation (HSCT). Previous studies showed that anti-HLA antibodies negatively impact engraftment in HSCT. This retrospective study of 51 pediatric patients with acquired aplastic anemia who underwent allogeneic HSCT at a single institution between 2006 and 2012 investigated the influence of anti-HLA antibodies on the outcome of HSCT. Serum samples collected before HSCT were tested for the presence of anti-HLA antibodies. Pre-existing anti-HLA antibodies were detected in 54.9% (28/51) of patients, among whom 39.2% (20/51) had anti-HLA class I antibodies. Anti-HLA antibodies were associated with worse five-yr survival (78.6% vs. 100%, p = 0.021) and higher treatment-related mortality (21.4% vs. 0%, p = 0.028) compared with antibody-negative patients. Anti-HLA class I antibody-positive patients had poorer five-yr survival (75.0%) than anti-HLA class I&II antibody-positive and antibody-negative patients (87.5% and 100.0%, respectively, p = 0.039). Presence of anti-HLA class I antibodies (p = 0.024) and older age (10 yr or more; p = 0.027) significantly increased the risk of post-HSCT mortality. Pre-existing anti-HLA antibodies negatively affect the outcome of HSCT in pediatric patients with aplastic anemia. Routine testing for anti-HLA antibodies concurrent with efficient treatment should be conducted prior to HSCT.

  15. 一种基于HLA Evovled的云仿真技术研究%Cloud Simulation Technology Based on HLA Evolved

    Institute of Scientific and Technical Information of China (English)

    高武奇; 康凤举; 钟联炯; 傅妍芳

    2011-01-01

    In order to realize the sharing of HLA simulation resources on Internet,the infrastructure and realizing framework of a cloud simulation based on HLA Evolved were put forward on the reference of cloud computing and the technical improvement of HLA Evolved.RTI component,modular FOM/SOM object model and WSDL API for the Web services were studied.The key techniques were settled,such as the technique of semantic service registration,discovery and composition,the technique of monitoring and prediction and the technique of distributed simulating and storage based on Hadoop.Then,the research was tested by the designed simulation supposition.The result shows that cloud simulation based on HLA Evolved design approach is feasible and effective.%针对现有HLA仿真资源难以与Internet共享使用的问题,借鉴云计算的思想,采用HLA Evolved相关的技术改进,提出了一种基于HLA Evolved的云仿真的体系结构和框架实现方案;研究了用于Web服务的RTI组件、模块化FOM/SOM对象模型和WSDL API函数等HLA Evolved技术,解决了基于多层语义的服务注册、发现、组合和平台的监控、预测及基于Hadoop的分布式存储、仿真技术;完成了一种战术通信网系统的云仿真测试实验,证明了基于HLA Evolved的云仿真设计方法的可行、有效。

  16. Correlation Between HLA-A, B and DRB1 Alleles and Severe Fever with Thrombocytopenia Syndrome

    Science.gov (United States)

    Zhang, Xiao-mei; Jiang, Xiao-lin; Pang, Bo; Song, Yong-hong; Wang, Jian-xing; Pei, Yao-wen; Zhu, Chuan-fu; Wang, Xian-jun; Yu, Xue-jie

    2016-01-01

    Objective Severe fever with thrombocytopenia syndrome (SFTS) is an emerging hemorrhagic fever caused by a tick-borne bunyavirus (SFTSV) in East Asian countries. The role of human leukocyte antigen (HLA) in resistance and susceptibility to SFTSV is not known. We investigated the correlation of HLA locus A, B and DRB1 alleles with the occurrence of SFTS. Methods A total of 84 confirmed SFTS patients (patient group) and 501 unrelated non-SFTS patients (healthy individuals as control group) from Shandong Province were genotyped by PCR-sequence specific oligonucleotide probe (PCR-SSOP) for HLA-A, B and DRB1 loci.Allele frequency was calculated and compared using χ2 test or the Fisher's exact test. A corrected P value was calculated with a bonferronis correction. Odds Ratio (OR) and 95% confidence intervals (CI) were calculated by Woolf’s method. Results A total of 11 HLA-A, 23 HLA-B and 12 HLA-DRB1 alleles were identified in the patient group, whereas 15 HLA-A, 30 HLA-B and 13 HLA-DRB1 alleles were detected in the control group. The frequencies of A*30 and B*13 in the SFTS patient group were lower than that in the control group (P = 0.0341 and 0.0085, Pc = 0.5115 and 0.252). The ORs of A*30 and B*13 in the SFTS patient group were 0.54 and 0.49, respectively. The frequency of two-locus haplotype A*30-B*13 was lower in the patient group than in the control group(5.59% versus 12.27%, P = 0.037,OR = 0.41, 95%CI = 0.18–0.96) without significance(Pc>0.05). A*30-B*13-DRB1*07 and A*02-B*15-DRB1*04 had strong associations with SFTS resistance and susceptibility respectively (Pc = 0.0412 and 0.0001,OR = 0.43 and 5.07). Conclusion The host HLA class I polymorphism might play an important role with the occurrence of SFTS. Negative associations were observed with HLA-A*30, HLA-B*13 and Haplotype A*30-B*13, although the associations were not statistically significant. A*30-B*13-DRB1*07 had negative correlation with the occurrence of SFTS; in contrast, haplotype A*02-B*15-DRB1

  17. Hypermethylation of the HLA-G promoter is associated with preeclampsia.

    Science.gov (United States)

    Tang, Yao; Liu, Haiyan; Li, Han; Peng, Ting; Gu, Weirong; Li, Xiaotian

    2015-09-01

    Preeclampsia (PE) is a severe pregnancy-induced disorder characterized by hypertension and proteinuria and a leading cause of perinatal maternal-fetal mortality and morbidity in developing countries. Dysregulated human leukocyte antigen (HLA)-G was found in placentas as well as in maternal sera from PE patients; however, the reason for this difference is unknown. As accumulating evidence has confirmed that DNA methylation is an important mechanism for regulating gene expression, we sought to test the hypothesis that alteration in the DNA methylation of the HLA-G promoter region is responsible for decreased expression of HLA-G in PE. Bisulfite pyrosequencing showed that a series of CpG sites in the HLA-G promoter region were significantly more highly methylated in PE than in normal pregnancy (NP). Interestingly, the hypermethylated CpG sites were mostly reported to be binding sites of active transcription factors. To further investigate the regulation of HLA-G methylation, we also defined the expression patterns of DNA methyltransferases (DNMTs) in placental tissue using immunohistochemistry and quantitative polymerase chain reaction analyses. Here, we demonstrate that DNMT-1 is overexpressed and HLA-G expression is reduced in PE women when compared with NP. Furthermore, both treatment with the DNMT inhibitor 5-aza-2'-deoxycytidine and specific knockdown of DNMT-1 using siRNAs can significantly increase the expression level of HLA-G in a trophoblastic cell line, indicating the potential mechanism of DNMT-1-mediated DNA methylation in HLA-G regulation. Taken together, our research confirms that DNMT-1-mediated promoter hypermethylation of HLA-G is associated with PE. These findings provide new insights into the diagnosis and treatment of PE.

  18. Application of Y-STP and HLA-A、-B、-DRB1 typing in duo Paternity Testing%Y-STR及HLA-A、-B、-DRB1基因分型在二联体亲子鉴定中的应用

    Institute of Scientific and Technical Information of China (English)

    魏天莉; 李茜; 程良红; 邹红岩; 邓志辉

    2009-01-01

    目的 研究增加Y-STR位点和HLA基因座的检测后,对二联体亲子鉴定亲子关系相对机会(RCP)值的影响. 方法 对二联体亲子鉴定案例除常规进行ABI AmpFLSTR IdentifilerTM试剂盒中的15个常染色体STR位点检测以外,增加ABI YfilerTM系统中的17个Y-STR或HLA-A、-B、-DRB1基因座的检测,并计算增加检测位点前后的亲子关系指数(PI)和RCP. 结果 经ABI IdentifilerTM试剂盒检测的135例二联体亲子鉴定,RCP值99.99%案例为109例,占80.74%,其余的26例(19.26%)RCP值均99.73%、但<99.99%,在这26例单亲案例中, 18例 "母-子"单亲案例增加HLA-A、-B、-DRB1基因座检测后,其中的15例RCP值>99.99%;8例 "父-子"单亲案例增加了17个Y-STR检测后,RCP值则均超过了99.99%. 结论 增加Y-STR或HLA-A、-B、-DRB1基因座等遗传标记物的检测,可有效提高二联体亲子鉴定的RCP值,从而提高鉴定的准确性.

  19. HLA-G allelic variants are associated with differences in the HLA-G mRNA isoform profile and HLA-G mRNA levels

    DEFF Research Database (Denmark)

    Hviid, Thomas Vauvert F; Hylenius, Sine; Rørbye, Christina

    2003-01-01

    between mother and fetus in several ways. Finally, the expression of membrane-bound HLA-G and soluble HLA-G has been proposed to influence the outcome of pregnancy, and an aberrant HLA-G expression in pre-eclamptic placentas and spontaneous abortions has been reported. Here, an association between certain...... HLA-G polymorphisms and the mRNA levels of the different alternatively spliced HLA-G isoforms in first trimester trophoblast cell populations is reported. Several alternatively spliced HLA-G mRNA isoforms, including a 14-bp polymorphism in the 3'UTR end (exon 8) of the HLA-G gene, are expressed...

  20. HLA-DQA1 and HLA-DQB1 allele diversity and its extended haplotypes in Madeira Island (Portugal).

    Science.gov (United States)

    Spínola, H; Lemos, A; Couto, A R; Parreira, B; Soares, M; Dutra, I; Bruges-Armas, J; Brehm, A

    2017-02-01

    This study shows, for the first time, high-resolution allele frequencies of HLA-DQA1 loci in Madeira Island (Portugal) and allows us to better understand and refine present knowledge on DQB1 variation, with the identification of several alleles not previously reported in this population. Estimates on haplotype profile, involving HLA-A, HLA-B, HLA-DRB1, HLA-DQA1 and HLA-DQB1, are also reported. © 2016 John Wiley & Sons Ltd.

  1. DIFFERENTIAL IMPACT OF HLA-A, HLA-B AND HLA-DR COMPATIBILITY ON THE RENAL ALLOGRAFT SURVIVAL

    Directory of Open Access Journals (Sweden)

    V. Y. Abramov

    2012-01-01

    Full Text Available We studied the long-term results of 532 deceased donor kidney transplantations to investigate the impact of HLA match on the survival of renal allograft. All transplants were performed in our center in 1996–2009 and moni- tored prospectively for 1–14 years. We found, the survival of 58 kidneys grafted with 0–2 mismatch for HLA- ABDR to be significantly better (Plogrank = 0,016 than the survival of the kidneys grafted with 3–6 HLA-ABDR mismatch. The full compatibility for HLA-A (n = 75 did not influence the long-term survival (Plogrank = 0,48. The absence of HLA-DR mismatch had a beneficial effect for survival of 68 kidneys (Plogrank = 0,07. Eighteen cases with the full HLA-B compatibility between graft and recipient demonstrated excellent long-term survival (Plogrank = 0,007. HLA-B compatibility influenced significantly (P = 0,042 the survival of transplanted kidney in the Cox regression model adjusted for donor and recipient age, panel-reactive antibody level, re-transplant, and immunosuppression protocol. The data obtained support the conclusion, that HLA compatibility should be one of the criteria of deceased donor kidney allocation. 

  2. HLA-Association in Patients with Intolerance to Mercury and Other Metals in Dental Materials

    Directory of Open Access Journals (Sweden)

    J. Procházková

    2000-01-01

    Full Text Available A group of selected 25 patients with serious intolerance to heavy metals used for dental restoration were examined for HLA antigens. A significant increase for HLA – B37, B47 and DR4 was found. The value of the relative risk is not significant after correction for the number of antigens tested and therefore further studies of more patients are needed.

  3. "The Role ofL-arginine in Control of Apoptosis in Preimplantation Mouse Embryos Cultured in High Glucose Media "

    Directory of Open Access Journals (Sweden)

    Mohammad Barbarestani

    2004-06-01

    Full Text Available Maternal hyperglycemia causes delay in early stages of embryonic growth and development, higher incidence of congenital malformations and spontaneous miscarriage compared with those of non-diabetic conditions. High glucosis tratogenicity seems to be related to reduction of Nitric Oxide production (NO in hyperglycemic condition. In order to test this hypothesis, 2-cell stage embryos of normal mice were cultured with high concentration of glucose (30mM and different concentrations of L-arginine (5,10,20 mM or L-NAME, an NO syntase (NOS inhibitor. In the end of culture, blastocysts were stained by by terminal deoxynucleotidyl transferase-mediated dUTP nick end-labeling (TUNEL technique and apoptotic cells were detected by using a Fluorescence microscope. Finally the amount of nitrite in the cultured media was assayed by Griess method. The results indicated that high glucose reduces Nitric Oxide production by preimplantation embryos and increases apoptosis of embryonic cells, but 5-20mM of L-arginine significantly increases Nitric Oxide production and decreases apoptosis. On the contrary L-NAME significantly inhibits the development of pre-implantation embryos. In conclusion, this study indicated that reduced nitric oxide production in high glucosis condition is a main factor for embryonic damage, and supplementation of high glucose media with L-arginine has an important role in prevention of high glucosis embryotoxicity

  4. The Study of Nitric Oxide Effects in Control of Mouse Preimplantation Embryonic Defects in High Glucosis Media

    Directory of Open Access Journals (Sweden)

    I. Amiri

    2003-10-01

    Full Text Available Pregnancy in diabetic females causes delay in early stages of embryonic growth and development and higher incidence of congenital malformations and spontaneous miscarriage compared with those of non- diabetic conditions. High glucosis tratogenicity seems to be related to reduction of Nitric Oxide production (NO in hyperglycemic condition. The goal of present work was study of nitric oxid role in control of mouse preimplantation embryonic defects in high glucosis media. In order to test above hypothesis, 2-cell stage embryos of normal mice were cultured with high concentration of glucose (30mM and different concentrations of L-arginine (5,10,20 mM or L-NAME (An antagonist of L- arginine. After 96h culture, the morphology of embryos was assessed by an inverted microscope then blastocysts were stained by TUNEL. After TUNEL the total cell number and apoptotic cells were counted by use a Fluorescence microscope. Finally the amount of nitrite in the media was assayed by Greiss method. The results indicated that high glucose decreases the blastocyst formation and Nitric Oxide production and increases their apoptotic index, but 10-20mM L-arginine significantly increases the developmental potential and nitric oxide production and significantly decreases apoptosis. On the contrary L-NAME significantly inhibits the development of pre-implantation embryos . It seems that during pregnancy supplementation of high glucose media with L-arginine increases Nitric Oxide production and prevents high glucosis embryotoxicity.

  5. Pre-implantation genetic screening using fluorescence in situ hybridization in couples of Indian ethnicity: Is there a scope?

    Directory of Open Access Journals (Sweden)

    Shailaja Gada Saxena

    2014-01-01

    Full Text Available Context: There is a high incidence of numerical chromosomal aberration in couples with repeated in vitro fertilization (IVF failure, advanced maternal age, repeated unexplained abortions, severe male factor infertility and unexplained infertility. Pre-implantation genetic screening (PGS, a variant of pre-implantation genetic diagnosis, screens numerical chromosomal aberrations in couples with normal karyotype, experiencing poor reproductive outcome. The present study includes the results of the initial pilot study on 9 couples who underwent 10 PGS cycles. Aim: The aim of the present study was to evaluate the beneficial effects of PGS in couples with poor reproductive outcome. Settings and Design: Data of initial 9 couples who underwent 10 PGS for various indications was evaluated. Subjects and Methods: Blastomere biopsy was performed on cleavage stage embryos and subjected to two round fluorescence in situ hybridization (FISH testing for chromosomes 13, 18, 21, X and Y as a two-step procedure. Results: Six of the 9 couples (10 PGS cycles conceived, including a twin pregnancy in a couple with male factor infertility, singleton pregnancies in a couple with secondary infertility, in three couples with adverse obstetric outcome in earlier pregnancies and in one couple with repeated IVF failure. Conclusion: In the absence of availability of array-comparative genomic hybridization in diagnostic clinical scenario for PGS and promising results with FISH based PGS as evident from the current pilot study, it is imperative to offer the best available services in the present scenario for better pregnancy outcome for patients.

  6. Amino acid residues 56 to 69 of HLA-A2 specify an antigenic determinant shared by HLA-A2 and HLA-B17.

    Science.gov (United States)

    Ways, J P; Rothbard, J B; Parham, P

    1986-07-01

    The mouse monoclonal antibody MA2.1 was previously used to define an epitope shared by native HLA-A2 and HLA-B17 molecules and amino acid sequence comparison of nine HLA-A,B,C molecules identified residues 62 to 65 as the region most likely to form this epitope. An unabsorbed rabbit antiserum raised against a peptide corresponding to residues 56 to 69 of HLA-A2 gives highly specific reactions with HLA-A2 and HLA-B17 heavy chains in Western blots. No interactions with native HLA-A2 and B17 molecules were detected in a variety of assays. Although the topographic relationship between the epitopes recognized by the rabbit antiserum and the monoclonal antibody could not be determined, the results show that residues 56 to 69 of HLA-A2 can form epitopes with specificity for HLA-A2 and HLA-B17.

  7. An association between ABO group and HLA antibody detection.

    Science.gov (United States)

    Dunbar, Nancy M; Yazer, Mark H; Bravo, Marjorie D; Kamel, Hany T; Gorlin, Jed; Norris, Philip J; Williamson, Phillip C; Vassallo, Ralph R

    2017-02-01

    US blood centers can screen female plateletpheresis donors with a history of one or more pregnancies for both Class I and Class II anti-HLA antibodies using one of two platforms. One is a flow-based assay that yields a quantitative result and the other an enzyme-linked immunosorbent assay (ELISA) that yields either a positive or a negative result (above or below cutoff). The results of HLA antibody screening tests were analyzed by donor ABO group. Results from large and small American blood collection centers using both platforms were analyzed. Positivity rates were compared by chi-square test and the results stratified by parity using the Mann-Whitney test. No differences in parity were noted among donors of different ABO groups, but a significantly higher rate of HLA antibody positivity was observed among group O donors for the ELISA (31% of group O donors vs. 21% of non-group O donors, p testing are unknown, this could result from test system characteristics or differences in group O donor antibody strength or specificity. © 2016 AABB.

  8. Allele Polymorphism and Haplotype Diversity of HLA-A, -B and -DRB1 Loci in Sequence-Based Typing for Chinese Uyghur Ethnic Group

    Science.gov (United States)

    Shen, Chun-mei; Zhu, Bo-feng; Deng, Ya-jun; Ye, Shi-hui; Yan, Jiang-wei; Yang, Guang; Wang, Hong-dan; Qin, Hai-xia; Huang, Qi-zhao; Zhang, Jing-Jing

    2010-01-01

    /Significance The present findings could be useful to elucidate the genetic background of the population and to provide valuable data for HLA matching in clinical bone marrow transplantation, HLA-linked disease-association studies, population genetics, human identification and paternity tests in forensic sciences. PMID:21079793

  9. Monocytic HLA DR antigens in schizophrenic patients.

    Science.gov (United States)

    Krause, Daniela; Wagner, Jenny; Matz, Judith; Weidinger, Elif; Obermeier, Michael; Riedel, Michael; Gruber, Rudolf; Schwarz, Markus; Mueller, Norbert

    2012-01-01

    A genetic association of specific human leukocyte antigens (HLA) DR genes and schizophrenia has recently been shown. These HLA play a fundamental role in the control of immune responses. Furthermore infectious agents have been proposed to be involved in the pathogenesis of schizophrenia. In this study we investigated the rate of HLA DR positive monocytes in schizophrenic patients compared to controls with a special focus on the adaption to in vitro stimulation with toll-like receptor ligands. Patients with schizophrenia and matched controls were included. For each individual, we evaluated the rate of HLA DR positive monocytes (either incubated at 37 °C or after stimulation with lipopolysaccharide or Poly I:C). We found a significantly higher percentage of schizophrenic patients with elevated HLA DR positive cells (p=0.045) as compared to controls. The adjustment rate from baseline levels of monocytic HLA DR positive cells to stimulation with Poly I:C was significantly lower in schizophrenic patients (p=0.038). The increased monocytic HLA DR in schizophrenic patients and the maladjustment of their monocytic HLA DR levels to an infectious stimulus might be a sign for a disturbed monocytic immune balance in schizophrenic individuals.

  10. [HLA and myasthenia. Subdivision in 3 categories].

    Science.gov (United States)

    Elchidiac, A; Lepage, V; Berrih, S; Colombani, J; Degos, L

    1985-01-01

    Genetic susceptibility (HLA types), clinical and pathological findings, amount of acetylcholine receptor antibodies and T lymphocyte subpopulations were studied in 63 patients with Myasthenia Gravis (MG). The frequency of HLA-DR5 was increased among patients (0.50 versus 0.23 in controls, pc less than 0.01, relative risk 3.3) and that of HLA-DR3 previously described as associated with MG was slightly increased (0.31 versus 0.20 in controls). The relative frequencies of two T cell subpopulations (T4 helper and T8 suppressor/cytotoxic lymphocytes) were normal in HLA-DR5 positive patients while the ratio T4/T8 was increased in other MG patients, who were HLA-DR3 (p less than 0.005). The high rate was due to an increase in the absolute number of T4 lymphocytes (p less than 0.001). HLA-DR3 patients were mostly women with early onset of a severe form of the disease, marked by the presence of thymic follicular lymphoid hyperplasia. A third genetic susceptibility to this disease was recently described in patients treated with D-penicillamine, the antigenic frequency of HLA-Bw35, DR1 is significantly increased. These 3 types of association between HLA and myasthenia gravis can be related to three different physiopathological mechanisms: the first two are probably linked to individual immunity (inductor/suppressor disequilibrium), in the third association, the mechanism is immunopharmacological.

  11. Preimplantation genetic diagnosis associated to Duchenne muscular dystrophy.

    Science.gov (United States)

    Bianco, Bianca; Christofolini, Denise Maria; Conceição, Gabriel Seixas; Barbosa, Caio Parente

    2017-09-21

    Duchenne muscular dystrophy is the most common muscle disease found in male children. Currently, there is no effective therapy available for Duchenne muscular dystrophy patients. Therefore, it is essential to make a prenatal diagnosis and provide genetic counseling to reduce the birth of such boys. We report a case of preimplantation genetic diagnosis associated with Duchenne muscular dystrophy. The couple E.P.R., 38-year-old, symptomatic patient heterozygous for a 2 to 47 exon deletion mutation in DMD gene and G.T.S., 39-year-old, sought genetic counseling about preimplantation genetic diagnosis process. They have had a 6-year-old son who died due to Duchenne muscular dystrophy complications. The couple underwent four cycles of intracytoplasmic sperm injection (ICSI) and eight embryos biopsies were analyzed by polymerase chain reaction (PCR) for specific mutation analysis, followed by microarray-based comparative genomic hybridisation (array CGH) for aneuploidy analysis. Preimplantation genetic diagnosis revealed that two embryos had inherited the maternal DMD gene mutation, one embryo had a chromosomal alteration and five embryos were normal. One blastocyst was transferred and resulted in successful pregnancy. The other embryos remain vitrified. We concluded that embryo analysis using associated techniques of PCR and array CGH seems to be safe for embryo selection in cases of X-linked disorders, such as Duchenne muscular dystrophy. RESUMO A distrofia muscular de Duchenne é a doença muscular mais comum observadas em crianças do sexo masculino. Atualmente, não há terapia eficaz disponível para distrofia muscular de Duchenne, portanto, é essencial o diagnóstico pré-natal e o aconselhamento genético para reduzir o nascimento desses meninos. Relatamos um caso de diagnóstico genético pré-implantação associado à distrofia muscular de Duchenne. O casal E.P.R., 38 anos, heterozigota, sintomática para uma mutação de deleção dos éxons 2 a 47 no gene

  12. Preimplantation genetic diagnosis of spinocerebellar ataxia 3 by (CAG)(n) repeat detection.

    Science.gov (United States)

    Drüsedau, M; Dreesen, J C F M; De Die-Smulders, C; Hardy, K; Bras, M; Dumoulin, J C M; Evers, J L H; Smeets, H J M; Geraedts, J P M; Herbergs, J

    2004-01-01

    Spinocerebellar ataxia 3 (SCA3) is an autosomal dominant neurodegenerative disorder characterized by variable expression and a variable age of onset. SCA3/MJD (Machado-Joseph disease) is caused by an expansion of a (CAG)(n) repeat in the MJD1 gene on chromosome 14q32.1. A single cell PCR protocol has been developed for preimplantation genetic diagnosis (PGD) of SCA3 to select unaffected embryos on the basis of the CAG genotype. Single leukocytes and blastomeres served as a single cell amplification test system to determine the percentage of allelic drop-out (ADO) and PCR efficiency. Out of 105 tested heterozygous single leukocytes, 103 (98.1%) showed a positive amplification signal, while five cells (4.9%) showed ADO. Amplification in single blastomeres was obtained in 13 out of a total of 14, and ADO was observed in two out of the 13 single blastomeres. PGD of SCA3 was performed in a couple with paternal transmission of the SCA3 allele. Seven embryos were available for biopsy, all biopsied blastomeres showed amplification and no ADO occurred. One embryo was diagnosed as affected whereas six embryos were diagnosed as unaffected. Two unaffected embryos were transferred and resulted in a singleton pregnancy and the birth of a healthy girl.

  13. First systematic experience of preimplantation genetic diagnosis for de-novo mutations.

    Science.gov (United States)

    Rechitsky, Svetlana; Pomerantseva, Ekaterina; Pakhalchuk, Tatiana; Pauling, Dana; Verlinsky, Oleg; Kuliev, Anver

    2011-04-01

    Standard preimplantation genetic diagnosis (PGD) cannot be applied for de-novo mutations (DNM), because neither origin nor relevant haplotypes are available for testing in single cells. PGD strategies were developed for 80 families with 38 genetic disorders, determined by 33 dominant, three recessive and two X-linked DNM. All three recessive mutations were of paternal origin, while of 93 dominant mutations, 40 were paternal, 46 maternal and seven detected in affected children. The development of specific PGD strategy for each couple involved DNA analysis of the parents and affected children prior to PGD, including a mutation verification, polymorphic marker evaluation, whole and single sperm testing to establish the normal and mutant haplotypes and PGD by polar body analysis and/or embryo biopsy. Overall, 151 PGD cycles were performed for 80 families, for which a specific PGD design has been established. The application of these protocols resulted in pre-selection and transfer of 219 (1.72 per cycle) DNM-free embryos in 127 (84.1%) PGD cycles, yielding 63 (49.6%) unaffected pregnancies and birth of 59 (46.5%) healthy children, confirmed to be free of DNM. The data show feasibility of PGD for DNM, which may routinely be performed with accuracy of over 99%, using the established PGD strategy.

  14. Evaluation of exclusion prenatal and exclusion preimplantation genetic diagnosis for Huntington's disease in the Netherlands.

    Science.gov (United States)

    van Rij, M C; de Die-Smulders, C E M; Bijlsma, E K; de Wert, G M W R; Geraedts, J P; Roos, R A C; Tibben, A

    2013-02-01

    Individuals at 50% risk of Huntington's disease (HD) who prefer not to know their carrier status, might opt for exclusion prenatal diagnosis (ePND) or exclusion preimplantation genetic diagnosis (ePGD). This study aims to provide a better understanding of couples' motives for choosing ePND or ePND, and surveys couples' experiences in order to make recommendations for the improvement of counselling for exclusion testing. This qualitative retrospective interview study focussed on couples who underwent ePND or ePGD for HD in the period 1996-2010. Seventeen couples were included of which 13 had experienced ePND and 6 ePGD. Mean time-interval since exclusion-testing was 3.9 years. Couples' moral reservations regarding termination of pregnancy (TOP) or discarding healthy embryos were counterbalanced by the wish to protect their future child against HD. Seven couples had terminated a total of 11 pregnancies with a 50% HD risk, none showed regret. ePGD was used by couples who wanted to avoid (another) TOP. ePND and ePGD are acceptable reproductive options for a specific group of counsellees. To guarantee sound standards of care, it is imperative that candidate couples be given in-depth non-directive counselling about all possible scenarios, and adequate professional and psychological support prior to, during and after ePND/ePGD.

  15. Clinical and counselling implications of preimplantation genetic diagnosis for Huntington's disease in the UK.

    Science.gov (United States)

    Lashwood, A; Flinter, F

    2001-01-01

    Huntington's disease is an autosomal dominant neurodegenerative disorder that usually occurs in adult life. Individuals at risk can have a gene test before the onset of symptoms, and prenatal diagnosis is available. Preimplantation genetic diagnosis (PGD) for Huntington's disease is now available for couples in whom one partner has the gene for Huntington's disease. A licence to practise PGD is required from the Human Fertilisation and Embryology Authority, and there are several complex issues relating to PGD for Huntington's disease that require consideration. The partner of the Huntington's disease gene carrier should have a presymptomatic test to ensure accuracy in a PGD cycle. There should be a delay between blood sampling and testing for Huntington's disease to allow time for reflection and withdrawal from testing. All PGD treatment has an associated risk of misdiagnosis. If confirmatory prenatal testing is not undertaken after a successful PGD cycle, no confirmation of diagnosis will be obtained at birth. Guidelines indicate that individuals who are at risk cannot be tested before 18 years. There is concern over the ability of a child or adolescent to make an informed choice about testing before this age. Confirmatory testing at birth after PGD would be in direct contravention of these guidelines. In the UK, the law requires consideration of the welfare of children born after assisted conception treatment. Presenting symptoms of Huntington's disease may affect the parenting abilities of an affected individual. There is a need for an assessment of a patient's current Huntington's disease status and their planned provision of care of children if Huntington's disease affects parenting. It has been necessary to create a detailed working protocol for the management of PGD for Huntington's disease to address these issues.

  16. HLA-DPB1 and HLA Class I Confer Risk of and Protection from Narcolepsy

    Science.gov (United States)

    Ollila, Hanna M.; Ravel, Jean-Marie; Han, Fang; Faraco, Juliette; Lin, Ling; Zheng, Xiuwen; Plazzi, Giuseppe; Dauvilliers, Yves; Pizza, Fabio; Hong, Seung-Chul; Jennum, Poul; Knudsen, Stine; Kornum, Birgitte R.; Dong, Xiao Song; Yan, Han; Hong, Heeseung; Coquillard, Cristin; Mahlios, Joshua; Jolanki, Otto; Einen, Mali; Lavault, Sophie; Högl, Birgit; Frauscher, Birgit; Crowe, Catherine; Partinen, Markku; Huang, Yu Shu; Bourgin, Patrice; Vaarala, Outi; Désautels, Alex; Montplaisir, Jacques; Mack, Steven J.; Mindrinos, Michael; Fernandez-Vina, Marcelo; Mignot, Emmanuel

    2015-01-01

    Type 1 narcolepsy, a disorder caused by a lack of hypocretin (orexin), is so strongly associated with human leukocyte antigen (HLA) class II HLA-DQA1∗01:02-DQB1∗06:02 (DQ0602) that very few non-DQ0602 cases have been reported. A known triggering factor for narcolepsy is pandemic 2009 influenza H1N1, suggesting autoimmunity triggered by upper-airway infections. Additional effects of other HLA-DQ alleles have been reported consistently across multiple ethnic groups. Using over 3,000 case and 10,000 control individuals of European and Chinese background, we examined the effects of other HLA loci. After careful matching of HLA-DR and HLA-DQ in case and control individuals, we found strong protective effects of HLA-DPA1∗01:03-DPB1∗04:02 (DP0402; odds ratio [OR] = 0.51 [0.38–0.67], p = 1.01 × 10−6) and HLA-DPA1∗01:03-DPB1∗04:01 (DP0401; OR = 0.61 [0.47–0.80], p = 2.07 × 10−4) and predisposing effects of HLA-DPB1∗05:01 in Asians (OR = 1.76 [1.34–2.31], p = 4.71 × 10−05). Similar effects were found by conditional analysis controlling for HLA-DR and HLA-DQ with DP0402 (OR = 0.45 [0.38–0.55] p = 8.99 × 10−17) and DP0501 (OR = 1.38 [1.18–1.61], p = 7.11 × 10−5). HLA-class-II-independent associations with HLA-A∗11:01 (OR = 1.32 [1.13–1.54], p = 4.92 × 10−4), HLA-B∗35:03 (OR = 1.96 [1.41–2.70], p = 5.14 × 10−5), and HLA-B∗51:01 (OR = 1.49 [1.25–1.78], p = 1.09 × 10−5) were also seen across ethnic groups in the HLA class I region. These effects might reflect modulation of autoimmunity or indirect effects of HLA class I and HLA-DP alleles on response to viral infections such as that of influenza. PMID:25574827

  17. Susceptibility to aplastic anemia is associated with HLA-DRB1*1501 in an aboriginal population in Sabah, Malaysia.

    Science.gov (United States)

    Dhaliwal, J S; Wong, Lily; Kamaluddin, Muhammad Amir; Yin, Lee Yin; Murad, Shahnaz

    2011-10-01

    The incidence of aplastic anemia is reported to be higher in Asia than elsewhere. We studied the frequency of human leukocyte antigen (HLA) DRB1 alleles in aplastic anemia patients from 2 genetically similar aboriginal groups, the Kadazan and the Dusun, and compared them with genetically matched community and hospital controls. HLA-DRB1*15 was significantly higher in the patients compared with controls (p = 0.005), confirming similar findings in Japanese and Caucasian studies. Further testing indicated a significantly higher frequency of HLA-DRB1*1501 in patients compared with controls (p = 0.0004) but no significant difference in the frequency of HLA-DRB1*1502. The high frequency of HLA-DRB1*15 in the Kadazan and Dusun population combined with the wide variety of environmental factors associated with aplastic anemia could be the reason for the elevated incidence of aplastic anemia in the Kadazan and Dusun in Sabah.

  18. Assessing high affinity binding to HLA-DQ2.5 by a novel peptide library based approach

    DEFF Research Database (Denmark)

    Jüse, Ulrike; Arntzen, Magnus; Højrup, Peter

    2011-01-01

    Here we report on a novel peptide library based method for HLA class II binding motif identification. The approach is based on water soluble HLA class II molecules and soluble dedicated peptide libraries. A high number of different synthetic peptides are competing to interact with a limited amount...... to HLA are then isolated by size exclusion chromatography and sequenced by tandem mass spectrometry online coupled to liquid chromatography. The MS/MS data are subsequently searched against a library defined database using a search engine such as Mascot, followed by manual inspection of the results. We...... used two dodecamer and two decamer peptide libraries and HLA-DQ2.5 to test possibilities and limits of this method. The selected sequences which we identified in the fraction eluted from HLA-DQ2.5 showed a higher average of their predicted binding affinity values compared to the original peptide...

  19. A Modified Protocol with Improved Detection Rate for Mis-Matched Donor HLA from Low Quantities of DNA in Urine Samples from Kidney Graft Recipients.

    Science.gov (United States)

    Kwok, Janette; Choi, Leo C W; Ho, Jenny C Y; Chan, Gavin S W; Mok, Maggie M Y; Lam, Man-Fei; Chak, Wai-Leung; Cheuk, Au; Chau, Ka-Foon; Tong, Matthew; Chan, Kwok-Wah; Chan, Tak-Mao

    2016-01-01

    Urine from kidney transplant recipient has proven to be a viable source for donor DNA. However, an optimized protocol would be required to determine mis-matched donor HLA specificities in view of the scarcity of DNA obtained in some cases. In this study, fresh early morning urine specimens were obtained from 155 kidney transplant recipients with known donor HLA phenotype. DNA was extracted and typing of HLA-A, B and DRB1 loci by polymerase chain reaction-specific sequence primers was performed using tailor-made condition according to the concentration of extracted DNA. HLA typing of DNA extracted from urine revealed both recipient and donor HLA phenotypes, allowing the deduction of the unknown donor HLA and hence the degree of HLA mis-match. By adopting the modified procedures, mis-matched donor HLA phenotypes were successfully deduced in all of 35 tested urine samples at DNA quantities spanning the range of 620-24,000 ng. This urine-based method offers a promising and reliable non-invasive means for the identification of mis-matched donor HLA antigens in kidney transplant recipients with unknown donor HLA phenotype or otherwise inadequate donor information.

  20. Anti-HLA and Anti-MICA Antibodies in Liver Transplant Recipients: Effect on Long-Term Graft Survival

    Directory of Open Access Journals (Sweden)

    Michał Ciszek

    2013-01-01

    Full Text Available Objective. Presence of anti-HLA antibodies has a well-known impact on kidney grafts survival; however their role in liver transplantation has not been fully elucidated. We conducted a 7-year prospective study to show correlation between presence of anti-HLA and anti-MICA antibodies and liver graft survival. Methods. Blood samples from 123 liver transplant recipients were collected during patients routine visits. Time from transplantation to blood sample collection was different for each patient. Blood samples were tested for anti-HLA (separately class I and II and MICA antibodies using Luminex assays. Results. There were 32 (26% patients with positive anti-HLA and 37 (30% with positive anti-MICA antibodies. Graft loss occurred in 7 cases (23% in anti-HLA positive group compared to 20 (22% in anti-HLA negative group ( and in 8 cases (22% in anti-MICA positive group but 19 (23% in anti-MICA negative group (. No correlations were detected between presence of antibodies and acute graft rejection (AGR. Presence of any antibodies (anti-HLA or anti-MICA antibodies correlated with late graft rejection (. Conclusion. Presence of anti-HLA or anti-MICA had no impact on long-term liver graft survival; however, detection of any antibodies was correlated with episodes of late graft rejection.

  1. CTL epitopes for influenza A including the H5N1 bird flu; genome-, pathogen-, and HLA-wide screening.

    Science.gov (United States)

    Wang, Mingjun; Lamberth, Kasper; Harndahl, Mikkel; Røder, Gustav; Stryhn, Anette; Larsen, Mette V; Nielsen, Morten; Lundegaard, Claus; Tang, Sheila T; Dziegiel, Morten H; Rosenkvist, Jørgen; Pedersen, Anders E; Buus, Søren; Claesson, Mogens H; Lund, Ole

    2007-04-12

    The purpose of the present study is to perform a global screening for new immunogenic HLA class I (HLA-I) restricted cytotoxic T cell (CTL) epitopes of potential utility as candidates of influenza A-virus diagnostics and vaccines. We used predictions of antigen processing and presentation, the latter encompassing 12 different HLA class I supertypes with >99% population coverage, and searched for conserved epitopes from available influenza A viral protein sequences. Peptides corresponding to 167 predicted peptide-HLA-I interactions were synthesized, tested for peptide-HLA-I interactions in a biochemical assay and for influenza-specific, HLA-I-restricted CTL responses in an IFN-gamma ELISPOT assay. Eighty-nine peptides could be confirmed as HLA-I binders, and 13 could be confirmed as CTL targets. The 13 epitopes, are highly conserved among human influenza A pathogens, and all of these epitopes are present in the emerging bird flu isolates. Our study demonstrates that present technology enables a fast global screening for T cell immune epitopes of potential diagnostics and vaccine interest. This technology includes immuno-bioinformatics predictors with the capacity to perform fast genome-, pathogen-, and HLA-wide searches for immune targets. To exploit this new potential, a coordinated international effort to analyze the precious source of information represented by rare patients, such as the current victims of bird flu, would be essential.

  2. HLA expression and HLA type associations in relation to EBV status in Hispanic Hodgkin lymphoma patients.

    Science.gov (United States)

    Fletcher, Luke B; Veenstra, Rianne N; Loo, Eric Y; Hwang, Amie E; Siddiqi, Imran N; Visser, Lydia; Hepkema, Bouke G; Nolte, Ilja M; van den Berg, Anke; Cozen, Wendy; Diepstra, Arjan

    2017-01-01

    A proportion of classical Hodgkin lymphomas harbor the Epstein Barr virus (EBV). We previously demonstrated that associations between Human Leukocyte Antigen (HLA) alleles and susceptibility to EBV+ classical Hodgkin lymphoma differ between European and Chinese populations. Data on Hispanic populations is missing. Here we examined the association between HLA type, tumor cell HLA expression and other characteristics in Hispanic Hodgkin lymphoma patients. Hispanic Hodgkin lymphoma patients diagnosed at the Los Angeles County-University of Southern California Medical Center from 2000-2012 were included (n = 65). Formalin-fixed paraffin-embedded tumor tissue was analyzed for EBV by in situ hybridization and for HLA class I and class II expression by immunohistochemistry. HLA typing was performed by HLA-A specific quantitative PCR of genomic DNA from tissue. Thirty patients (46%) had EBV+ tumors. Expression of HLA class I (p = 0.0006) was significantly associated with EBV+ tumor status in Hispanic patients, similar to Europeans and Chinese. A positive association between HLA class II expression and EBV+ tumor status, as present in large studies in Europeans, was not found (p = 0.06). The prevalences of the specific European HLA-A*01 risk and European HLA-A*02 protective types were not significantly associated with EBV+ tumors among these Hispanic patients, however numbers were too low to draw firm conclusions. The HLA-A*02:07 allele, that is associated with EBV+ Hodgkin lymphoma in Chinese, was absent. In conclusion, the association between EBV positivity in tumor cells and HLA class I expression appears to be consistent across different populations. Larger studies in Hispanics are needed to evaluate HLA allele susceptibility associations.

  3. [HL-A antigens in dust allergy in children].

    Science.gov (United States)

    Seignalet, J; Levallois, C; Lapinski, H; Jean, R

    1976-12-01

    The distribution of 29 HLA antigens has been compared in 60 unrelated children presenting a dust allergy and in 300 healthy controls. We observed an increased frequency for HLA-Aw19 and HLA-B5 in patients. Yet, the differences are not very significant and there is probably no association between one HLA gene and the dust allergy.

  4. Review:Whole genome amplification in preimplantation genetic diagnosis

    Institute of Scientific and Technical Information of China (English)

    Ying-ming ZHENG; Ning WANG; Lei LI; Fan JIN

    2011-01-01

    Preimplantation genetic diagnosis(PGD)refers to a procedure for genetically analyzing embryos prior to implantation,improving the chance of conception for patients at high risk of transmitting specific inherited disorders.This method has been widely used for a large number of genetic disorders since the first successful application in the early 1990s.Polymerase chain reaction(PCR)and fluorescent in situ hybridization(FISH)are the two main methods in PGD,but there are some inevitable shortcomings limiting the scope of genetic diagnosis.Fortunately,different whole genome amplification(WGA)techniques have been developed to overcome these problems.Sufficient DNA can be amplified and multiple tasks which need abundant DNA can be performed.Moreover,WGA products can be analyzed as a template for multi-loci and multi-gene during the subsequent DNA analysis.In this review,we will focus on the currently available WGA techniques and their applications,as well as the new technical trends from WGA products.

  5. [Preimplantation genetic diagnosis: update of the Parisian group].

    Science.gov (United States)

    Frydman, René; Tachdjian, Gérard; Achour-Frydman, Nelly; Ray, Pierre; Romana, Serge; Hamamah, Samir; Marcadet-Fredet, Sabine; Kerbrat, Violaine; Fanchin, Renato; Kadoch, Jacques; Attie, Tania; Lelorc'h, M; Vekemans, Michel; Munnich, Arnold

    2002-01-01

    To report the birth of the first fourteen infants conceived after preimplantation genetic diagnosis (PGD) in our unit. Fifty-nine couples were enrolled between January 2000 and July 2001. They had a total of 71 oocyte pick-up cycles. The collected oocytes were inseminated by intracytoplasmic sperm injection. The resulting embryos were biopsied on the third day of development and the genetic analysis was performed on the same day. Most of the embryo transfers were carried out on the fourth day. The 71 oocyte pick-up cycles yielded 872 oocytes of which 731 were suitable for intracytoplasmic sperm injection. Among the 505 embryos obtained, 421 embryos were biopsied and genetic diagnosis was performed for 312 (74%) of these 127 embryos were transferred during the course of 58 transfer procedures. There were 18 biochemical and 12 ongoing (7 singles, 4 twins and 1 triple) pregnancies. Sixteen infants have been born and 2 are expected. PGD has gained a place among the choices offered to couples at risk of transmission of a serious and incurable genetic disease.

  6. Preimplantation genetic diagnosis for gender selection in the United States

    Energy Technology Data Exchange (ETDEWEB)

    Colls, P.; Silver, L.; Olivera, G.; Weier, J.; Escudero, T.; Goodall, N.; Tomkin, G.; Munne, S.

    2009-08-20

    Preimplantation genetic diagnosis (PGD) of gender selection for non medical reasons has been considered an unethical procedure by several authors and agencies in the Western society on the basis of disrupting the sex ratio, being discriminatory againsts women and disposal of normal embryos of the non desired gender. In this study, the analysis of a large series of PGD procedures for gender selection from a wide geographical area in the United States, shows that in general there is no deviation in preference towards any specific gender except for a preference of males in some ethnic populations of Chinese, Indian and Middle Eastern origin that represent a small percentage of the US population. In cases where only normal embryos of the non-desired gender are available, 45.5% of the couples elect to cancel the transfer, while 54.5% of them are open to have transferred embryos of the non-desired gender, this fact being strongly linked to cultural and ethnical background of the parents. In addition this study adds some evidence to the proposition that in couples with previous children of a given gender there is no biological predisposition towards producing embryos of that same gender. Based on these facts, it seems that objections to gender selection formulated by ethics committees and scientific societies are not well-founded.

  7. [First birth after preimplantation genetic diagnosis performed on thawed embryos].

    Science.gov (United States)

    Frydman, N; Ray, P; Romana, S; Fanchin, R; Lelorc'h, M; Kerbrat, V; Frydman, R; Tachdjian, G

    2003-06-01

    To report the birth of the first infant conceived after preimplantation genetic diagnosis (PGD) performed on frozen-thawed embryos in our PGD center. Three couples (C1, C2 and C3) who had frozen embryos from a previous in vitro fertilization attempt were enrolled in our PGD program. Embryos were thawed one day before the biopsy procedure for the couples C1 and C3 and the day of the biopsy for the couple C2. The single cell genetic analysis was performed by a multiplex PCR for the couple C1 and by fluorescent in situ hybridization for the couples C2 and C3. The embryos transfers were carried out on the third or fourth day. Out of ten thawed embryos, eight were biopsied and five were transferred during three embryos transfers. Two biochemical and one ongoing pregnancy were obtained yielded one birth. PGD may be offered to couples at risk of transmission of a serious and incurable genetic disease and having frozen embryos.

  8. Preimplantation genetic diagnosis for gender selection in the USA.

    Science.gov (United States)

    Colls, P; Silver, L; Olivera, G; Weier, J; Escudero, T; Goodall, N; Tomkin, G; Munné, S

    2009-01-01

    Preimplantation genetic diagnosis (PGD) for gender selection for non-medical reasons has been considered an unethical procedure by several authors and agencies in the Western society on the basis that it could disrupt the sex ratio, that it discriminates against women and that it leads to disposal of normal embryos of the non-desired gender. In this study, the analysis of a large series of PGD procedures for gender selection from a wide geographical area in the USA shows that, in general, there is no deviation in preference towards any specific gender except for a preference of males in some ethnic populations of Chinese, Indian and Middle Eastern origin that represent a small percentage of the US population. In cases where only normal embryos of the non-desired gender are available, 45.5% of the couples elect to cancel the transfer, while 54.5% of them are open to have embryos transferred of the non-desired gender, this fact being strongly linked to cultural and ethnic background of the parents. In addition this study adds some evidence to the proposition that, in couples with previous children of a given gender, there is no biological predisposition towards producing embryos of that same gender. Based on these facts, it seems that objections to gender selection formulated by ethics committees and scientific societies are not well founded.

  9. LIF supports primitive endoderm expansion during pre-implantation development

    DEFF Research Database (Denmark)

    Morgani, Sophie M; Brickman, Joshua M

    2015-01-01

    report that LIF has two distinct roles: it blocks early epiblast (Epi) differentiation, and it supports the expansion of primitive endoderm (PrE)-primed ESCs and PrE in vivo. We find that activation of JAK/STAT signalling downstream of LIF occurs initially throughout the pre-implantation embryo......, but later marks the PrE. Moreover, the addition of LIF to cultured embryos increases the GATA6(+) PrE population, whereas inhibition of JAK/STAT signalling reduces both NANOG(+) epiblast and GATA6(+) PrE. The reduction of the NANOG(+) Epi might be explained by its precocious differentiation to later Epi...... derivatives, whereas the increase in PrE is mediated both by an increase in proliferation and inhibition of PrE apoptosis that is normally triggered in embryos with an excess of GATA6(+) cells. Thus, it appears that the relative size of the PrE is determined by the number of LIF-producing cells in the embryo...

  10. Preimplantation genetic diagnosis in patients with male meiotic abnormalities.

    Science.gov (United States)

    Aran, B; Veiga, A; Vidal, F; Parriego, M; Vendrell, J M; Santaló, J; Egozcue, J; Barri, P N

    2004-04-01

    Indications and candidates for preimplantation genetic diagnosis (PGD) have increased in recent years. This study evaluates whether IVF-intracytoplasmic sperm injection (ICSI) results could be improved by selecting embryos through PGD-AS (aneuploidy screening) in couples in whom the male partner presents meiotic abnormalities. Two hundred and fifty-six embryos were biopsied and 183 were suitable for analysis (73.2%). Ninety-two embryos showed normal chromosomal analysis (50.3% of the analysed embryos and 57.5% of the diagnosed embryos). Pregnancy, abortion and implantation rates were compared with 66 IVF-ICSI cycles performed in 44 patients with meiotic abnormalities without PGD (control group). No statistically significant differences in the pregnancy rate (52 versus 43.9%), implantation rate (32.1 versus 23.5%) and miscarriage rate (15.4 versus 10.3%) were observed between the groups. Although the embryos obtained from men with meiotic abnormalities showed a high frequency of chromosome abnormalities, no improvements in pregnancy and implantation rates were obtained after PGD-AS in the series analysed.

  11. A simplified technique for embryo biopsy for preimplantation genetic diagnosis.

    Science.gov (United States)

    Wang, Wei-Hua; Kaskar, Khalied; Gill, Jimmy; DeSplinter, Traci

    2008-08-01

    To report a simplified embryo biopsy method for preimplantation genetic diagnosis (PGD). Technique and method. A regional hospital in vitro fertilization (IVF) laboratory and private reproductive medicine clinic. Women undergoing IVF and PGD. Blastomeres were successfully isolated from day-3 embryos at various stages. Blastomere integrity after biopsy, time of biopsy procedure, and subsequent blastocyst developmental rate. Twenty embryos derived from abnormally fertilized oocytes (one pronucleus or three pronuclei) were used for biopsy at four-cell to 10-cell stages (day 3) by a laser zona drilling and assisted hatching micropipette delivery of culture medium inside the zona to push one blastomere out. Biopsies of all embryos using this method were successful. In two cases for PGD, fourteen 6-9-cell and four 3-4-cell stage embryos were successfully biopsied by this method. Ten out of 14 embryos from the 6-9-cell stage developed to hatching or hatched blastocysts. When two hatched blastocysts were vitrified, warmed, and cultured, both reexpanded, showing normal morphologic features. This technique is easy to learn, less damaging to the embryos, and less time consuming. It can be used for all stages of embryos without damage to either embryos or isolated blastomeres. It is an alternative method for embryo biopsy in PGD.

  12. Comprehensive evaluation of two HLA-B17 monoclonal antibodies for flow cytometry-based HLA-B57/B58 screening prior to abacavir prescription.

    Science.gov (United States)

    Stevens, R; Coates, E; Street, J; Cook, E; Darke, C

    2013-08-01

    Hypersensitivity reactions to the drug abacavir, used to treat HIV/AIDS patients, is associated with possession of HLA-B*57:01. We have carefully assessed two commercially available HLA-B57/B58 murine monoclonal antibodies [0196HA and BIH0243 (One Lambda Inc.)] in a simple flow cytometry-based assay. The evaluation involved tests on 228 reference and random samples covering 91% of all WHO recognized HLA-A, B and C specificities. These involved donors with six different HLA-B*57 alleles and included 19 examples of B*57:01. Both antibodies unambiguously detected B57, but there were small difference in their reactivity against B57-positive non-B*57:01 samples. Importantly, there was no reactivity against B57/B58-negative samples. The possible amino acid motifs involved in the reactivity of these antibodies with B57/B58 were delineated. Thus, HLA-B57/B58, normally present in <10% of patients, can be easily recognized using these two antibodies and further tested by a DNA-based typing method to identify B*57:01.

  13. Identification of a novel HLA-A allele A * 11:01:37 by sequence-based typing%基因测序鉴定新等位基因HLA-A*11:01:37

    Institute of Scientific and Technical Information of China (English)

    张春来; 梁刚; 张毅; 乔文本; 朱传福

    2012-01-01

    Objective To identify a novel HLA-A allele in a Chinese Han individual. Methods One mismatch was observed in HLA-A locus in HLA typing for CMDP donors using bi-allelic SBT kit. A confirmatory test for novel HLA allele was performed with mono-allelic SBT kit. Results The DNA sequence was confirmed to be a novel HLA-A allele. There was 1 nucleotide differed from the closest matching HLA-A * 11: 01: 01 at position 393(G→A) , which resulting a change from GGG to GGA at codon 107, led to a silent mutation, conserving the amino acid Gly. Conclusion A novel HLA-A allele was confirmed and officially named HLA-A * 11: 01: 37 (Genbank accession number, JN209962) by the WHO Nomenclature Committee for Factors of the HLA System in January 2012.%目的 鉴定1个中国汉族人群中发现的HLA-A新等位基因.方法 应用双链亢接测序分型技术对中华骨髓库志愿捐献者进行常规HLA高分辨分型,发现1份样本HLA-A位点有1个碱基错配,采用单链DNA测序进行新等位基因鉴定.结果 确认1个等位基因序列未曾报道过,与同源性最高的HLA-A*11:01:01相比,该等位基因393位碱基由G变为A,导致107位密码子由GGG变为GGA,编码氨基酸未改变,仍为甘氨酸(Gly).结论 鉴定了1个新的HLA-A等位基因,2012年1月被世界卫生组织HLA因子命名委员会正式命名为HLA-A*11:01:37,Genbank注册号为JN209962.

  14. HLA diversity in the 1000 genomes dataset.

    Directory of Open Access Journals (Sweden)

    Pierre-Antoine Gourraud

    Full Text Available The 1000 Genomes Project aims to provide a deep characterization of human genome sequence variation by sequencing at a level that should allow the genome-wide detection of most variants with frequencies as low as 1%. However, in the major histocompatibility complex (MHC, only the top 10 most frequent haplotypes are in the 1% frequency range whereas thousands of haplotypes are present at lower frequencies. Given the limitation of both the coverage and the read length of the sequences generated by the 1000 Genomes Project, the highly variable positions that define HLA alleles may be difficult to identify. We used classical Sanger sequencing techniques to type the HLA-A, HLA-B, HLA-C, HLA-DRB1 and HLA-DQB1 genes in the available 1000 Genomes samples and combined the results with the 103,310 variants in the MHC region genotyped by the 1000 Genomes Project. Using pairwise identity-by-descent distances between individuals and principal component analysis, we established the relationship between ancestry and genetic diversity in the MHC region. As expected, both the MHC variants and the HLA phenotype can identify the major ancestry lineage, informed mainly by the most frequent HLA haplotypes. To some extent, regions of the genome with similar genetic or similar recombination rate have similar properties. An MHC-centric analysis underlines departures between the ancestral background of the MHC and the genome-wide picture. Our analysis of linkage disequilibrium (LD decay in these samples suggests that overestimation of pairwise LD occurs due to a limited sampling of the MHC diversity. This collection of HLA-specific MHC variants, available on the dbMHC portal, is a valuable resource for future analyses of the role of MHC in population and disease studies.

  15. HLA-A*7401-mediated control of HIV viremia is independent of its linkage disequilibrium with HLA-B*5703

    DEFF Research Database (Denmark)

    Matthews, Philippa C; Adland, Emily; Listgarten, Jennifer

    2011-01-01

    disease, highlighting improved viremic control in subjects with HLA-A*7401 combined with HLA-B*57. In common with HLA-B alleles that are associated with effective control of viremia, HLA-A*7401 presents highly targeted epitopes in several proteins, including Gag, Pol, Rev, and Nef, of which the Gag...

  16. Identification of class I HLA T cell control epitopes for West Nile virus.

    Directory of Open Access Journals (Sweden)

    Saghar Kaabinejadian

    Full Text Available The recent West Nile virus (WNV outbreak in the United States underscores the importance of understanding human immune responses to this pathogen. Via the presentation of viral peptide ligands at the cell surface, class I HLA mediate the T cell recognition and killing of WNV infected cells. At this time, there are two key unknowns in regards to understanding protective T cell immunity: 1 the number of viral ligands presented by the HLA of infected cells, and 2 the distribution of T cell responses to these available HLA/viral complexes. Here, comparative mass spectroscopy was applied to determine the number of WNV peptides presented by the HLA-A*11:01 of infected cells after which T cell responses to these HLA/WNV complexes were assessed. Six viral peptides derived from capsid, NS3, NS4b, and NS5 were presented. When T cells from infected individuals were tested for reactivity to these six viral ligands, polyfunctional T cells were focused on the GTL9 WNV capsid peptide, ligands from NS3, NS4b, and NS5 were less immunogenic, and two ligands were largely inert, demonstrating that class I HLA reduce the WNV polyprotein to a handful of immune targets and that polyfunctional T cells recognize infections by zeroing in on particular HLA/WNV epitopes. Such dominant HLA/peptide epitopes are poised to drive the development of WNV vaccines that elicit protective T cells as well as providing key antigens for immunoassays that establish correlates of viral immunity.

  17. HLA-DRB genotype and specific IgE responses in patients with allergies to penicillins

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    Background Because of the pivotal role of the human leukocyte antigen (HLA) class II molecules in regulating the immune response and their extensive polymorphism, it is not surprising that particular HLA class II alleles have been implicated in susceptibility to allergic diseases and in restriction of the IgE responses to a variety of allergens. We investigated the relationship between HLA-DRB genotype and allergies to various penicillins and explored HLA-DRB restriction of IgE responses to these derivatives of penicillin.Methods Radioallergosorbent test was used to examine 8 kinds of specific IgE antibodies (4 major and 4 minor antigenic determinants) in the sera of 248 patients with an allergy to penicillins and 101 healthy subjects without any allergic reaction. Some (113 patients and 87 healthy control subjects) were chosen from all subjects to type for HLA-DRB alleles by sequence specific primer-polymerase chain reaction.Results Compared with control subjects, a significantly increased frequency of DR9 was present in 77 patients with allergic reactions, with immediate hypersensitive reaction and with urticaria (P = 0.011; P = 0.019; P = 0.005 respectively). Conversely, a significantly decreased frequency of DR14.1 was found in 80 patients with positive IgE antibodies, with immediate reaction and with urticaria compared with control group (P = 0.024; P = 0.038; P = 0.038). A possible excess of HLA-DR17 was found in subjects who were responsive to benzylpenicilloyl compared with those were not (χ2 = 5.134, P = 0.023), and of HLA-DR4 was found in subjects responsive to phenoxomethylpenicillanyl (PVA, χ2 = 4.057, P = 0.044).Conclusion HLA-DRB gene may be involved in allergy to penicillins through modulating specific serum IgE to penicillins.

  18. Immunization of HLA-A*0201 and/or HLA-DPβ1*04 Patients with Metastatic Melanoma Using Epitopes from the NY-ESO-1 Antigen

    Science.gov (United States)

    Khong, Hung T.; Yang, James C.; Topalian, Suzanne L.; Sherry, Richard M.; Mavroukakis, Sharon A.; White, Donald E.; Rosenberg, Steven A.

    2008-01-01

    HLA class I-restricted peptides are often used in peptide vaccine regimens. There is strong evidence that many of these peptides can generate specific CD8+ T-cell responses in vivo; however, only occasional objective clinical responses have been reported. To test whether provision of “help” would enhance antitumor immunity, the authors initiated a clinical trial in which patients with metastatic melanoma were immunized against the NY-ESO-1 tumor antigen, using an HLA-A2-restricted peptide (ESO-1:165V), an HLA-DP4-restricted peptide (NY-ESO-1:161-180), or both peptides given concomitantly. The first cohorts received only ESO-1:165V, using three vaccination schedules. Immunologically, most patients developed immune responses to the HLA-A2-restricted native ESO-1 epitope after vaccination. Peptide vaccine given daily for 4 days appeared to induce immunologic responses more rapidly than if given once a week or once every 3 weeks. In contrast, vaccination using the NY-ESO-1:161-180 peptide induced immune responses in only a few patients. Clinically, one patient who received NY-ESO-1:161-180 peptide alone had a partial response lasing 12 months. Concomitant vaccination with the HLA class II-restricted peptide did not alter the immune response to the HLA class I-restricted peptide form NY-ESO-1. However, vaccination with the HLA-A2-restricted epitope generated primarily T cells that did not recognize tumor after in vitro sensitization. This result raises questions about the use of synthetic peptides derived from NY-ESO-1 as a sole form of immunization. PMID:15534491

  19. Birth of healthy female twins after preimplantation genetic diagnosis of cystic fibrosis combined with gender determination.

    Science.gov (United States)

    Ray, Pierre F; Frydman, Nelly; Attié, Tania; Hamamah, Samir; Kerbrat, Violaine; Tachdjian, Gérard; Romana, Serge; Vekemans, Michel; Frydman, René; Munnich, Arnold

    2002-07-01

    Two healthy sisters with a familial history of mental retardation were referred to our centre for preimplantation genetic diagnosis (PGD). Their two brothers showed severe mental retardation. The molecular basis for their disorder could not be identified, but one of the sisters and the mother presented a highly skewed pattern of X-inactivation reinforcing the likelihood of an X-linked mode of inheritance. Both sisters requested PGD to avoid the abortion of potentially affected male fetuses. PGD for sex by fluorescent in-situ hybridization was carried out for the first sister and resulted in the birth of a female child. The second sister and her partner, whose niece had cystic fibrosis (CF), were tested for CF mutations, and were both found to be deltaF508 heterozygous. We developed an efficient single cell PCR protocol for the simultaneous amplification of the CF (deltadeltaF508) locus as well as the X-linked amelogenin gene and its highly homologous pseudogene on the Y chromosome. Two PGD cycles were carried out to screen against male and deltaF508 homozygous deleted embryos. In each case several embryos could be selected for transfer and the second cycle resulted in a twin pregnancy followed by the birth of two healthy female infants.

  20. Improved single-cell protocol for preimplantation genetic diagnosis of spinal muscular atrophy.

    Science.gov (United States)

    Burlet, Philippe; Frydman, Nelly; Gigarel, Nadine; Bonnefont, Jean Paul; Kerbrat, Violaine; Tachdjian, Gérard; Frydman, René; Munnich, Arnold; Steffann, Julie; Ray, Pierre F

    2005-09-01

    To develop and validate a simple and reliable single-cell analysis protocol for the preimplantation genetic diagnosis (PGD) of spinal muscular atrophy (SMA). Molecular tests based on specific enzymatic digestion have already been described for SMA diagnosis. We modified the amplified DNA fragments so as to introduce a novel restriction site that provides an internal control for the completeness of the digestion. The genetics and reproduction departments of two teaching hospitals. Six informed couples at risk of transmitting SMA. All patients underwent standard procedures associated with intracytoplasmic sperm injection. Improvement of SMA diagnostic efficiency and accuracy on single cell. One hundred fifty lymphocytes were analyzed with our protocol. One hundred percent diagnostic accuracy was achieved from both homozygous normal and SMN1-deleted leukocytes. Successful molecular analysis was achieved for 36 of 42 biopsied embryos (86%). Twenty-five normal embryos were transferred, but no pregnancy was achieved. We developed an improved protocol for PGD of SMA that is simple, robust, and accurate; unfortunately, no pregnancies were achieved for any of the six patients who have undergone PGD in the program thus far.

  1. HLA-DRB1 allele in 35 patients with alveolar echinococcosis in Gansu Province of China

    Institute of Scientific and Technical Information of China (English)

    LI Furong李富荣; SHI Youen石佑恩; SHI Dazhong史大中; Dominique Angele Vuitton; Philip Simon Craig

    2003-01-01

    Objective To investigate the association between histocompatibility leukocyte antigen (HLA)-DRB1 alleles and alveolar echinococcosis (AE).Methods Thirty-five patients with AE in high prevalence areas in Gansu Province of China were tested for the HLA-DRB1 gene using the polymerase chain reaction with sequence-specific primer (PCR-SSP) technique. The results were compared with those of 104 healthy individuals.Results The frequency of the HLA-DRB1·040x gene was 26% in the patient group, which was significantly higher than that in the control group (9.62%) with a relative risk (RR) of 4.45 (χ2 =13.67, P<0.01), and an etiological fraction (EF) of 0.20. The frequency of the HLA-DRB1·0701 allele was significantly lower in the patient group (2.86%) as compared to the control group (13.94%; χ2=6.67, P<0.05) with a preventable fraction (PF) of 0.30. The frequencies of other DRB1 alleles were not significantly different.Conclusion Susceptibility to AE is significantly associated with the HLA-DRB1·040x. HLA-DRB1·0701 gene might confer protection against AE in humans.

  2. HLA Immunogenotype Determines Persistent Human Papillomavirus Virus Infection in HIV-Infected Patients Receiving Antiretroviral Treatment.

    Science.gov (United States)

    Meys, Rhonda; Purdie, Karin J; de Koning, Maurits N C; Quint, Koen D; Little, Ann-Margaret; Baker, Finnuala; Francis, Nick; Asboe, David; Hawkins, David; Marsh, Steven G E; Harwood, Catherine A; Gotch, Frances M; Bunker, Christopher B

    2016-06-01

    A proportion of human immunodeficiency virus (HIV)-infected patients develop persistent, stigmatizing human papillomavirus (HPV)-related cutaneous and genital warts and anogenital (pre)cancer. This is the first study to investigate immunogenetic variations that might account for HPV susceptibility and the largest to date to categorize the HPV types associated with cutaneous warts in HIV-positive patients. The HLA class I and II allele distribution was analyzed in 49 antiretroviral (ART)-treated HIV-positive patients with persistent warts, 42 noninfected controls, and 46 HIV-positive controls. The allele HLA-B*44 was more frequently identified in HIV-positive patients with warts (P = .004); a susceptible haplotype (HLA-B*44, HLA-C*05; P = .001) and protective genes (HLA-DQB1*06; P = .03) may also contribute. Cutaneous wart biopsy specimens from HIV-positive patients harbored common wart types HPV27/57, the unusual wart type HPV7, and an excess of Betapapillomavirus types (P = .002), compared with wart specimens from noninfected controls. These findings suggest that HLA testing might assist in stratifying those patients in whom vaccination should be recommended. © The Author 2016. Published by Oxford University Press for the Infectious Diseases Society of America. All rights reserved. For permissions, e-mail journals.permissions@oup.com.

  3. Association between HLA-DQ genotypes and haplotypes vs Helicobacter pylori infection in an Indonesian population.

    Science.gov (United States)

    Zhao, Yang; Wang, Jingwen; Tanaka, Tsutomu; Hosono, Akihiro; Ando, Ryosuke; Soeripto, Soeripto; Ediati Triningsih, F X; Triono, Tegu; Sumoharjo, Suwignyo; Astuti, E Y Wenny; Gunawan, Stephanus; Tokudome, Shinkan

    2012-01-01

    Helicobacter pylori is an important gastrointestinal pathogen related to the development of not only atrophic gastritis and peptic ulcer, but also gastric cancer. Human leukocyte antigens (HLA) may play particular roles in host immune responses to bacterial antigens. This study aimed to investigate the association between HLA-DQA1 and DQB1 genotypes and haplotypes vs H. pylori infection in an Indonesian population. We selected 294 healthy participants in Mataram, Lombok Island, Indonesia. H. pylori infection was determined by urea breath test (UBT). We analyzed HLA-DQA1 and DQB1 genotypes by PCR-RFLP and constructed haplotypes of HLA-DQA1 and DQB1 genes. Multiple comparisons were conducted according to the Bonferroni method. The H. pylori infection rate was 11.2% in this Indonesian population. The DQB1*0401 genotype was noted to be associated with a high risk of H. pylori infection, compared with the DQB1*0301 genotype. None of the HLA-DQA1 or DQB1 haplotypes were related to the risk of H. pylori infection. The study suggests that HLADQB1 genes play important roles in H. pylori infection, but there was no statistically significant association between HLA-DQA1 or DQB1 haplotypes and H.pylori infection in our Lombok Indonesian population.

  4. Low HLA polymorphism in Colombian mestizos

    OpenAIRE

    Ávila-Portillo, Luz Mabel; Instituto de Referencia Andino S.A.; Hospital Militar Central; Carmona, Alejandra; Universidad Católica de Manizales; Franco, Leidy; Instituto de Referencia Andino S.A.; Briceño, Ignacio; Pontificia Universidad Javeriana; Casas, María Consuelo; Instituto de Referencia Andino S.A.; Gómez, Alverto; Instituto de Referencia Andino S.A.; Pontificia Universidad Javeriana

    2010-01-01

    Objective: This paper aims to describe the allele frequency and haplotype of HLA class I and II molecules in a Colombian mestizo population.Methodology: HLA class I and II molecules on 197 unrelated Colombian individuals and 157 unrelated individuals making up 53 families fromdifferent regions of the country were studied at the Immunology Laboratory at the Military Hospital Central of Bogotá and at the Instituto de ReferenciaAndino by the PCR-SSP method.Results: The haplotype HLA-A * 24 B*35 ...

  5. HLA: The Major Histocompatibility Complex of Man

    Science.gov (United States)

    1991-01-01

    at glomerular basement membrane mediate Goodpasture syndrome , EF = (-I a which is associated with HLA-DR2. HLA-DR2 and RR a + b HLA-DR3 as well as...hemochromatosis A3 8.2 0.67 B14 4.7 0.13 Goodpasture syndrome D/DR2 15.9 0.82 Idiopathic membranous nephropathy D/DR3 12.0 0.69 aXd *RR = relative risk...distinct syndromes based on the mode of onset. Three main groups are (1) systemic Characler Positive Character Negatike with daily intermittent fever

  6. [Detection of common determinants of HLA antigens A2 and B17 by absorption using human HLA serum].

    Science.gov (United States)

    Májský, A; Korínková, P

    1983-01-01

    Attempts of cross absorption where sera of anti-HLA A2 + B17, anti-HLA A2 and anti-HLA B17 with thrombocytes were absorbed from donors of HLA A2 positive, B17 negative and HLA A2 negative, B17 positive, revealed that anti-HLA A2 and anti-HLA B17 could be eliminated from the sera of both HLA types on the platelets. Thus, the findings allow the existence of a common determinant of HLA A2 and B17-antigens to be assumed. This is the first case where the evidence of a cross reaction between antigens of two different HLA loci with human sera could be established.

  7. Serum α-klotho concentrations during preimplantation can predict aging or quality of human oocytes and clinical pregnancy rates

    OpenAIRE

    Takemura, Takashi; Okabe, Midori

    2016-01-01

    Background To discover simple biomarkers to evaluate the aging or quality of human oocytes and clinical pregnancy rates is needed. However, the association among serum α-klotho concentrations during preimplantation, the aging or quality of human oocytes and clinical pregnancy rates has not been investigated. Findings The serum α-klotho concentrations during preimplantation decreased due to aging (p 

  8. Screening a hybridoma producing a specific monoclonal antibody to HLA-A24+Bw4 antigen by cytotoxicity inhibition assay.

    Science.gov (United States)

    Hiroishi, S; Kaneko, T; Arita, J

    1987-02-01

    A hybridoma secreting a monoclonal antibody (Tsa-1, IgG3) reacting specifically to HLA-A24+Bw4 was screened by cytotoxicity inhibition assay and micrototoxicity test. The R value of the antibody was 0.843.

  9. HLA-DPB1 and HLA class I confer risk of and protection from narcolepsy

    DEFF Research Database (Denmark)

    Ollila, Hanna M; Ravel, Jean-Marie; Han, Fang

    2015-01-01

    Type 1 narcolepsy, a disorder caused by a lack of hypocretin (orexin), is so strongly associated with human leukocyte antigen (HLA) class II HLA-DQA1(∗)01:02-DQB1(∗)06:02 (DQ0602) that very few non-DQ0602 cases have been reported. A known triggering factor for narcolepsy is pandemic 2009 influenza...... of autoimmunity or indirect effects of HLA class I and HLA-DP alleles on response to viral infections such as that of influenza....

  10. Lack of association between alopecia areata and HLA class I and II in a southeastern Brazilian population*

    Science.gov (United States)

    Barbosa, Ângela Marques; Prestes-Carneiro, Luiz Euribel; Sobral, Aldri Roberta Sodoschi; Sakiyama, Marcelo Jun; Lemos, Bruna Cerávolo; de Abreu, Marilda Aparecida Milanez Morgado; Martos, Luciana Leite Crivelin; Moliterno, Ricardo Alberto

    2016-01-01

    Background Alopecia areata (AA) is a common disorder of unknown etiology that affects approximately 0.7% to 3.8% of patients among the general population. Currently, genetic and autoimmune factors are emphasized as etiopathogenic. Studies linking Human Leukocyte Antigens (HLA) to AA have suggested that immunogenetic factors may play a role in the disease's onset/development. Objectives To investigate an association between AA and HLA class I/II in white Brazilians. Methods: Patients and control groups comprised 33 and 112 individuals, respectively. DNA extraction was performed by column method with BioPur kit. Allele's classification was undertaken using the PCR-SSO technique. HLA frequencies were obtained through direct counting and subjected to comparison by means of the chi-square test. Results Most patients were aged over 16, with no familial history, and developed partial AA, with no recurrent episodes. Patients showed a higher frequency of HLA-B*40, HLA-B*45, HLA-B*53 and HLA-C*04 compared with controls, although P was not significant after Bonferroni correction. Regarding HLA class II, only HLA-DRB1*07 revealed statistical significance; nevertheless, it featured more prominently in controls than patients (P=0.04; Pc=0.52; OR=0.29; 95%; CI=0.07 to 1.25). P was not significant after Bonferroni correction. Conclusions The development of AA does not seem to be associated with HLA in white Brazilians, nor with susceptibility or resistance. The studies were carried out in populations with little or no miscegenation, unlike the Brazilian population in general, which could explain the inconsistency found. PMID:27438193

  11. Lab-on-a-chip enabled HLA diagnostic: combined sample preparation and real time PCR for HLA-B57 diagnosis

    Science.gov (United States)

    Gärtner, Claudia; Becker, Holger; Hlawatsch, Nadine; Klemm, Richard; Moche, Christian; Schattschneider, Sebastian; Frank, Rainer; Willems, Andreas

    2015-05-01

    The diverse human HLA (human leukocyte antigen) system is responsible for antigen presentation and recognition. It is essential for the immune system to maintain a stable defense line, but also is also involved in autoimmunity as well as metabolic disease. HLA-haplotype (HLA-B27), for instance, is associated with inflammatory diseases such as Bechterew's disease. The administration of the HIV drug Abacavir in combination with another HLA-haplotype (HLAB57) is associated with severe hypersensitivity reactions. Accordingly, the HLA status has to be monitored for diagnosis or prior to start of therapy. Along this line, a miniaturized microfluidic platform has been developed allowing performing the complete analytical process from "sample-in" to "answer-out" in a point-of-care environment. The main steps of the analytical cascade inside the integrated system are blood cell lysis and DNA isolation, DNA purification, real-time PCR and quantitative monitoring of the rise of a fluorescent signal appearing during the PCR based sequence amplification. All bio-analytical steps were intended to be performed inside one chip and will be actuated, controlled and monitored by a matching device. This report will show that all required processes are established and tested and all device components work well and interact with the functional modules on the chips in a harmonized fashion.

  12. Association between HLA-Class I and HLA-Class II Alleles and Mycobacterium Tuberculosis Infection in Iraqi Patients from Baghdad City

    Directory of Open Access Journals (Sweden)

    Nidhal Abdulmohaimen Mohammed

    2014-03-01

    Full Text Available Background: Pulmonary tuberculosis (PT is one of the endemic diseases in Iraq, and among the suggested predisposing factors are alleles of the human leukocyte antigen (HLA system. We sought to investigate the association between HLA-class I (A and B and -class II (DR and DQ alleles in a sample of PT Iraqi patients. Methods: lymphocytes of 105 PT patients and 40 controls were phenotyped for HLA-A, -B, -DR, and -DQ alleles by means of the microlymphocytotoxicity test using a panel of monoclonal antisera. Results: HLA frequencies of B18 (16.2 vs. 2.5%; OD=7.53 and DR1 (51.4 vs. 10.0%; OD=9.53 alleles were significantly increased in the patients as compared with the controls, while B5 (6.7 vs. 25.0%, DR8 (1.9 vs. 17.5%, and DQ3 (11.4 vs. 45.0% alleles were significantly decreased. However, a significant corrected level was maintained for only DR1, DR8, and DQ3 alleles (Pc=1.9×10-5, 0.02 and 1.0×10-4, respectively. Conclusion: The results confirm the predisposing and protecting roles of HLA alleles in PT.

  13. [Preimplantation embryo development: current status and perspectives in clinical embryology].

    Science.gov (United States)

    Royère, D; Guérif, F

    2008-11-01

    Preimplantation embryo development is one of the key features with implantation itself to achieve a pregnancy. Assisted Reproductive Technologies (ART) both in human and animal have improved our knowledge on these events, although predicting embryo potential to give a baby remains elusive. However data from the last 10 years have allowed either to hierarchize the available parameters or to open some new perspectives to predict embryo developmental potential. Both kinetics and morphological parameters belong to noninvasive quality embryo assessment for many years, although recent data on microvideographic analysis and multivariate analysis led to reduce their biological meaning. Moreover, new technical detection of meiotic spindle birefringency or zona pellucida anisotropy has improved the oocyte quality assessment with a deep impact for countries with restrictive legislation. Beyond such morphological criteria, more functional approaches concerned the oocyte (embryo) or its environment. Direct transcriptomic analysis, while invasive and therefore experimental, brought important data on embryo "quality". However, noninvasive metabolomic or proteomic analysis of embryo media gave promising results as well as respirometry. The environment of the oocyte has focused a specific attention, either based on regulatory proteins or cytokines present in follicular fluid, or involving genes or proteins from cumulus cells, as oocyte-cumulus dialog is a key factor in oocyte maturation. Whereas it is not possible for the time being to predict which parameter(s) will be implemented routinely, all data obtained underline that the ability to develop and implant is not based on embryo superlatives (more rapid, expressing more genes or proteins, larger metabolites uptake) but rather on a quiet state, as claimed by Leese some years ago, where a lot of resources would not be mobilized by any stressful situation.

  14. Statistical resolution of ambiguous HLA typing data.

    Directory of Open Access Journals (Sweden)

    Jennifer Listgarten

    2008-02-01

    Full Text Available High-resolution HLA typing plays a central role in many areas of immunology, such as in identifying immunogenetic risk factors for disease, in studying how the genomes of pathogens evolve in response to immune selection pressures, and also in vaccine design, where identification of HLA-restricted epitopes may be used to guide the selection of vaccine immunogens. Perhaps one of the most immediate applications is in direct medical decisions concerning the matching of stem cell transplant donors to unrelated recipients. However, high-resolution HLA typing is frequently unavailable due to its high cost or the inability to re-type historical data. In this paper, we introduce and evaluate a method for statistical, in silico refinement of ambiguous and/or low-resolution HLA data. Our method, which requires an independent, high-resolution training data set drawn from the same population as the data to be refined, uses linkage disequilibrium in HLA haplotypes as well as four-digit allele frequency data to probabilistically refine HLA typings. Central to our approach is the use of haplotype inference. We introduce new methodology to this area, improving upon the Expectation-Maximization (EM-based approaches currently used within the HLA community. Our improvements are achieved by using a parsimonious parameterization for haplotype distributions and by smoothing the maximum likelihood (ML solution. These improvements make it possible to scale the refinement to a larger number of alleles and loci in a more computationally efficient and stable manner. We also show how to augment our method in order to incorporate ethnicity information (as HLA allele distributions vary widely according to race/ethnicity as well as geographic area, and demonstrate the potential utility of this experimentally. A tool based on our approach is freely available for research purposes at http://microsoft.com/science.

  15. Preimplantation Exposure to Bisphenol A and Triclosan May Lead to Implantation Failure in Humans

    Directory of Open Access Journals (Sweden)

    Mu Yuan

    2015-01-01

    Full Text Available Endocrine disrupting chemicals (EDCs are chemicals that have the capacity to interfere with normal endocrine systems. Two EDCs, bisphenol A (BPA and triclosan (TCS, are mass-produced and widespread. They both have estrogenic properties and similar chemical structures and pharmacokinetic features and have been detected in human fluids and tissues. Clinical evidence has suggested a positive association between BPA exposure and implantation failure in IVF patients. Studies in mouse models have suggested that preimplantation exposure to BPA and TCS can lead to implantation failure. This paper reviews the relationship between preimplantation exposure to BPA and TCS and implantation failure and discusses the remaining problems and possible solutions.

  16. Preliminar toxicological assesement of Ruta graveolens, Origanum vulgare and Persea americana on the preimplantational mouse embryos

    Directory of Open Access Journals (Sweden)

    V. Benavides

    2014-06-01

    Full Text Available The growing interest in natural medicine makes it necessary to study plant properties as well as their possible secondary effects. In recent years the toxic effects of many medicinal plants on the preimplantational mouse embryo development have been studied. Many of them produce malformations and alterations in the embryonic development. Ruta graveolens "ruda", Origanum vulgare "oregano" and Persea americana "palta" are used in rural areas to menstrual colic and to provoke abortion (estrella, 1995. This study is aimed at assessing "in vivd'the effect of extracts of "oregano", "ruda" and "palta" to 20% on the morphology and growth of preimplantational mouse embryos.

  17. Effect of HLA on hepatitis C virus clearance and persistence in anti-HCV-positive end-stage renal disease patients

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    Serkan Ocal

    2014-01-01

    Full Text Available Background/Aims: The efficacy of immune response against hepatitis C virus (HCV is determined by human leukocyte antigen (HLA molecules of the host which present HCV antigens to CD4 + and CD8 + T lymphocytes. In this study, we aimed to investigate the possible relationship between the frequencies of certain HLA class I-II alleles and the natural history of HCV in patients with end-stage renal disease (ESRD. Settings and Design: This is a retrospective cohort study conducted in a university hospital. Patients and Methods: The present study comprised 189 ESRD patients (candidates for renal transplantation who had positive anti-HCV antibody test. The results concerning HCV and HLA status were gathered from patients′ files. The viral persistence was compared between the groups that were determined by HLA sub-typing. Statistical Analysis: Statistical evaluation was performed using Mann-Whitney U-test, Chi-square test, and Fisher′s exact test. Level of error was set at 0.05 for all statistical evaluations, and P values < 0.05 were considered statistically significant. Results: We found possible association between the course of HCV infection and specific HLA alleles. HLA class I CwFNx016 and HLA class II DRBFNx0110 alleles were observed more frequently in the viral clearance group (P < 0.05. The HLA class I BFNx0138 allele group was more prone to develop chronic hepatitis C (P < 0.01. Conclusions: These findings suggest that HLA class I CwFNx016 and HLA class II DRBFNx0110 alleles may be associated with immunological elimination of HCV in Turkish patients on hemodialysis. HLA sub-typing could help predict the prognosis of HCV infection.

  18. Complementarity of Binding Motifs is a General Property of HLA-A and HLA-B Molecules and Does Not Seem to Effect HLA Haplotype Composition

    OpenAIRE

    2013-01-01

    Different human leukocyte antigen (HLA) haplotypes (i.e., the specific combinations of HLA-A, -B, -DR alleles inherited together from one parent) are observed in different frequencies in human populations. Some haplotypes, like HLA-A1-B8, are very frequent, reaching up to 10% in the Caucasian population, while others are very rare. Numerous studies have identified associations between HLA haplotypes and diseases, and differences in haplotype frequencies can in part be explained by these assoc...

  19. Donor killer immunoglobulin-like receptor genes and reactivation of cytomegalovirus after HLA-matched hematopoietic stem-cell transplantation: HLA-C allotype is an essential cofactor

    Directory of Open Access Journals (Sweden)

    Carolyn E. Behrendt

    2013-02-01

    Full Text Available Natural Killer (NK cells whose killer immunoglobulin-like receptors (KIR recognize human leukocyte antigen (HLA ligand are licensed for activity. In contrast, non-licensed NK cells display KIRs for which ligand is absent from the self genotype and are usually hyporesponsive. Surprisingly, non-licensed cells are active in tumor control after hematopoietic stem-cell transplantation (HSCT and dominate NK response to murine cytomegalovirus (CMV infection. From those reports, we hypothesized that control of human CMV early after HSCT is influenced by donor KIR genes whose HLA ligand is absent-from-genotype of HLA-matched donor and recipient. To investigate, we studied CMV reactivation through Day 100 after grafts involving CMV-seropositive donor and/or recipient. A multivariate proportional rates model controlled for variability in surveillance and established covariates including acute graft-versus-host disease; statistical significance was adjusted for testing of multiple KIRs with identified HLA class I ligand (2DL1, 2DL2/3, 2DS1, 2DS2, full-length 2DS4, 3DL1/3DS1, 3DL2. Among HSCT recipients (n=286, CMV reactivation-free survival time varied with individual donor KIR genes evolutionarily-specific for HLA-C: when ligand was absent from the donor/recipient genotype, inhibitory KIRs 2DL2 (P<0.0001 and 2DL1 (P=0.015 each predicted inferior outcome, and activating KIRs 2DS2 (P<0.0001, 2DS1 (P=0.016, and 2DS4 (P=0.016 each predicted superior outcome. Otherwise, with ligand present-in-genotype, donor KIR genes had no effect. In conclusion, early after HLA-matched HSCT, individual inhibitory and activating KIR genes have qualitatively different effects on risk of CMV reactivation; unexpectedly, absence of HLA-C ligand from the donor/recipient genotype constitutes an essential cofactor in these associations. Being KIR and HLA-C specific, these findings are independent of licensing via alternate NK cell receptors (NKG2A, NKG2C that recognize HLA-E.

  20. HLA-B27 subtypes among the Chukotka native groups

    Energy Technology Data Exchange (ETDEWEB)

    Krylov, M.Y.; Alexeeva, L.I.; Erdesz, S.; Benevolenskaya, L.I. [Akademiya Meditsinskikh Nauk SSSR, Moscow (Russian Federation). Inst. Revmatizma; Reveille, J.D.; Arnett, F.C. [Texas Univ., Houston, TX (United States). Health Science Center

    1995-12-31

    The purpose of this study was to assess the relative frequency of the known HLA-B27 subtypes in HLA-B27 positive Chukotka natives, which have higher frequencies of HLA-B27 (to 40%) and spondylarthropathies (to 2%) than the Russian Caucasian population. Using oligotyping of the polymerase-chain reaction amplified second and third exons of the HLA-B27 gene in 86 DNA samples from HLA-B27 positive individuals were successfully typed. All had HLA-B*2705, including 4 patients with Reiter`s syndrome and 5 with ankylosing spondyloarthritis, except one Eskimo who had HLA-B*2702. None had HLA-B*2704, a frequent subtype in Orientals. With respect to HLA-B27 subtypes the indigenous populations from the eastern part of the Chukotka Peninsula are genetically more closely related to Caucasians than to Orientals. (author). 18 refs, 1 fig., 2 tabs.

  1. Definitive class I human leukocyte antigen expression in gestational placentation: HLA-F, HLA-E, HLA-C, and HLA-G in extravillous trophoblast invasion on placentation, pregnancy, and parturition.

    Science.gov (United States)

    Hackmon, Rinat; Pinnaduwage, Lakmini; Zhang, Jianhong; Lye, Stephen J; Geraghty, Daniel E; Dunk, Caroline E

    2017-06-01

    The extravillous trophoblasts (EVT) express HLA-C and HLA-G, but HLA-E and HLA-F are the subject of conflicting reports. In this study, we define the HLA expression profile during active EVT placental implantation, pregnancy development, and parturition. Immunohistochemistry, q-PCR, and Western blot were used to investigate HLA-C, HLA-E, and HLA-F placental expression across gestation from the early first trimester, late first trimester, second trimester (n=10 in each), preterm gestation (n=6) to elective term cesarean section and term vaginal deliveries (n=12, 38-41 weeks). EVT explants and Swan71 cells were used to assess HLA-C and HLA-F during active EVT migration. HLA-G, HLA-C, and HLA-F were expressed by 1st-trimester EVT and became intracellular and weaker as gestation progressed. HLA-E was only expressed in 1st-trimester placenta. HLA-F and HLA-C mRNA and protein expression levels showed a significant increase in the fetal villous mesenchyme across gestation. HLA-C levels increased with labor. We detected a 100-kDa HLA-F band in early pregnancy suggesting dimer formation on the EVT surface. These results were confirmed in EVT outgrowths and Swan71 trophoblast which showed that HLA-F and HLA-G are increased on the cell surface of migrating EVT, while HLA-C was internalized. Expression of HLA-F and HLA-G on the cell surface of actively migrating EVT supports their specific role in early EVT invasion and interactions with uterine natural killer cells. HLA-C's limited expression to the proliferative EVT suggests a protective role in the earliest events of implantation but not in active EVT invasion. We also show for the first time that HLA-C may be involved in parturition. © 2017 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd.

  2. Potential role for PADI-mediated histone citrullination in preimplantation development

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    Kan Rui

    2012-06-01

    Full Text Available Abstract Background The peptidylarginine deiminases (PADIs convert positively charged arginine residues to neutrally charged citrulline on protein substrates in a process that is known as citrullination or deimination. Previous reports have documented roles for histone citrullination in chromatin remodeling and gene regulation in several tissue types, however, a potential role for histone citrullination in chromatin-based activities during early embryogenesis has not been investigated. Results In the present study, we tested by laser scanning confocal indirect immunofluorescence microscopy whether specific arginine residues on the histone H3 and H4 N-terminal tails (H4R3, H3R2 + 8 + 17, and H3R26 were citrullinated in mouse oocytes and preimplantation embryos. Results showed that all of the tested residues were deiminated with each site showing a unique localization pattern during early development. Given these findings, we next tested whether inhibition of PADI activity using the PADI-specific inhibitor, Cl-amidine, may affect embryonic development. We found that treatment of pronuclear stage zygotes with Cl-amidine reduces both histone H3 and H4 tail citrullination and also potently blocks early cleavage divisions in vitro. Additionally, we found that the Cl-amidine treatment reduces acetylation at histone H3K9, H3K18, and H4K5 while having no apparent effect on the repressive histone H3K9 dimethylation modification. Lastly, we found that treatment of zygotes with trichostatin A (TSA to induce hyperacetylation also resulted in an increase in histone citrullination at H3R2 + 8 + 17. Conclusions Given the observed effects of Cl-amidine on embryonic development and the well documented correlation between histone acetylation and transcriptional activation, our findings suggest that histone citrullination may play an important role in facilitating gene expression in early embryos by creating a chromatin environment that is

  3. Limited role of HLA DQ2/8 genotyping in diagnosing coeliac disease.

    Science.gov (United States)

    Paul, Siba P; Hoghton, Matthew; Sandhu, Bhupinder

    2017-02-01

    The European guidelines for diagnosing coeliac disease in children were revised in 2012. These recommend that in symptomatic children, a diagnosis of coeliac disease can be made without small-bowel biopsies provided their anti-tissue transglutaminase (anti-tTG) titre is >10 times of upper-limit-of-normal (>10×ULN) and anti-endomysial antibody is positive. In order to firm up the diagnosis in these children with very high anti-tTG titre, HLA-DQ2/DQ8 should be checked and be positive. Approximately 25-40% of white Caucasian population has HLA-DQ2/DQ8 haplotype. However, only 0.1-1% of the population will develop coeliac disease. Therefore, HLA-DQ2/DQ8 testing must not be done to 'screen' or 'diagnose' children with coeliac disease. Its use by paediatricians should be limited to children with anti-tTG>10×ULN, where the diagnosis of coeliac disease is being made on serology alone. A review of case referrals made to a tertiary paediatric gastroenterology centre in Southwest England demonstrated that HLA-DQ2/DQ8 testing is being requested inappropriately both in primary and secondary care suggesting a poor understanding of its role in diagnosis of coeliac disease. This article aims to clarify the role of HLA-DQ2/DQ8 testing for clinicians working in non-specialist settings.

  4. Association of high CD4-positive T cell infiltration with mutations in HLA class II-regulatory genes in microsatellite-unstable colorectal cancer.

    Science.gov (United States)

    Surmann, Eva-Maria; Voigt, Anita Y; Michel, Sara; Bauer, Kathrin; Reuschenbach, Miriam; Ferrone, Soldano; von Knebel Doeberitz, Magnus; Kloor, Matthias

    2015-03-01

    Besides being expressed on professional antigen-presenting cells, HLA class II antigens are expressed on various tumors of non-lymphoid origin, including a subset of colorectal cancers (CRC). Information about the regulation of HLA class II antigen expression is important for a better understanding of their role in the interactions between tumor and immune cells. Whether lack of HLA class II antigen expression in tumors reflects the selective immune destruction of HLA class II antigen-expressing tumor cells is unknown. To address this question, we tested whether lack of HLA class II antigen expression in CRC was associated with immune cell infiltration. We selected microsatellite-unstable (MSI-H) CRC, because they show pronounced tumor antigen-specific immune responses and, in a subset of tumors, lack of HLA class II antigen expression due to mutations inactivating HLA class II-regulatory genes. We examined HLA class II antigen expression, mutations in regulatory genes, and CD4-positive T cell infiltration in 69 MSI-H CRC lesions. Mutations in RFX5, CIITA, and RFXAP were found in 13 (28.9%), 3 (6.7%), and 1 (2.2%) out of 45 HLA class II antigen-negative tumors. CD4-positive tumor-infiltrating lymphocyte counts were significantly higher in HLA class II antigen-negative tumors harboring mutations in HLA class II-regulatory genes (107.4 T cells per 0.25 mm(2)) compared to tumors without mutations (55.5 T cells per 0.25 mm(2), p = 0.008). Our results suggest that the outgrowth of tumor cells lacking HLA class II antigen expression due to mutations of regulatory genes is favored in an environment of dense CD4-positive T cell infiltration.

  5. The presence of HLA-antibodies in recurrent miscarriage patients is associated with a reduced chance of a live birth

    DEFF Research Database (Denmark)

    Nielsen, Henriette Svarre; Witvliet, Marian D; Steffensen, Rudi;

    2010-01-01

    Anti-paternal HLA-antibodies are considered a harmless phenomenon during most pregnancies, whereas their role in recurrent miscarriage (RM) patients is disputed. In contrast to primary RM, patients with secondary RM have carried a fetus to term pregnancy prior to a series of miscarriages, which....... Sera from women with secondary RM (n=56), primary RM (n=13) and parous controls (n=24) were tested for HLA-antibodies using an ELISA assay and complement dependent cytotoxicity. Samples were taken at gestational week 4-5 in 62 (90%) of the patients. HLA-antibodies were significantly more frequent...

  6. Five amino acids in three HLA proteins explain most of the association between MHC and seropositive rheumatoid arthritis

    OpenAIRE

    Raychaudhuri, Soumya; Sandor, Cynthia; Stahl, Eli A; Freudenberg, Jan; Lee, Hye-Soon; Jia, Xiaoming; Alfredsson, Lars; Padyukov, Leonid; Klareskog, Lars; Worthington, Jane; Siminovitch, Katherine A.; Bae, Sang-Cheol; Robert M Plenge; Peter K Gregersen; De Bakker, Paul I. W.

    2012-01-01

    The genetic association of the major histocompatibility complex (MHC) to rheumatoid arthritis risk has commonly been attributed to HLA-DRB1 alleles. Yet controversy persists about the causal variants in HLA-DRB1 and the presence of independent effects elsewhere in the MHC. Using existing genome-wide SNP data in 5,018 seropositive cases and 14,974 controls, we imputed and tested classical alleles and amino acid polymorphisms for HLA-A, B, C, DPA1, DPB1, DQA1, DQB1, and DRB1 along with 3,117 SN...

  7. Effect of Yttrium Pre-Implantation on Implantation Behavior of Ti-6Al-4V Alloy in Nitrogen Plasma Immersion Ion Implantation

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    In order to increase the peak depth of nitrogen atoms during the nitrogen plasma immersion ion implantation of Ti-6Al-4V alloy, the rare earth metal yttrium was applied. In the experiment, yttrium and nitrogen ions were implanted under the voltage of 20 and 30 kV, respectively. In the samples with yttrium pre-implantation for 30 min, the Auger electron spectroscopy(AES) analysis shows that the peak depth of the nitrogen atoms increases from 50 up to 100 nm. It can also be seen from the tribological tests that the wear resistance of these samples is increased remarkably.

  8. Analysis of HLA-A, HLA-B, HLA-DRB1 allelic, genotypic, and haplotypic frequencies in colombian population

    Directory of Open Access Journals (Sweden)

    Yazmin Rocío Árias-Murillo

    2010-12-01

    Full Text Available Introduction: The high polymorphism of the HLA system allows its typification to be used as valuable tool in establishing association to various illnesses, immune and genetic profiles; it also provides a guide to identifying compatibility among donors and receptors of organs transplants.Objective: To establish HLA-A, HLA-B, and HLA.DRB1 allele, genotype and haplotype frequencies among patients treated at Clinica Colsanitas SA.Methods: 561 patients coming from different regions in Colombia, who were attended in 8 centers of the clinical laboratory of the Clinica Colsanitas in different cities of the country from January 2004 to August 2008, were included in this study. All were HLA-A,-B, and -DRB1 typified via SSP PCR. Allele, genotype and haplotype frequencies were estimated with STATA Software Version 9.0 and the GENEPOP genetic analysis package.Results: 19, 28, and 15 different alleles were identified for loci HLA-A,-B and -DRB1, respectively. Alleles found most frequently were A*24 (26.2%, A*02 (26%, B*35(22.7%, and DRB1*04 (24%. The most frequent genotypes were A*02,24 (14.2%, B*07,35 (5.5%, DRB1*01,04, and DRB1*04,04 (6.9%; while most the frequent haplotypes were HLA A*24, B*35 (9.2%, A*24, DRB1*04 (8.1%; B*35, DRB1*04 (7.8%, A*2 DRB1*04 (7.4%.Conclusion: The results obtained provide a useful reference framework for the population studied, allowing compatibility probability calculations to be performed for organ transplants.

  9. Analysis of HLA-A, HLA-B, HLA-DRB1 allelic, genotypic, and haplotypic frequencies in colombian population

    Directory of Open Access Journals (Sweden)

    Yamín Rocío Arias-Murillo

    2011-01-01

    Full Text Available Introduction: The high polymorphism of the HLA system allows its typification to be used as valuable tool in establishing association to various illnesses, immune and genetic profiles; it also provides a guide to identifying compatibility among donors and receptors of organs transplants. Objective: To establish HLA-A, HLA-B, and HLA.DRB1 allele, genotype and haplotype frequencies among patients treated at Clinica Colsanitas SA. Methods: 561 patients coming from different regions in Colombia, who were attended in 8 centers of the clinical laboratory of the Clinica Colsanitas in different cities of the country from January 2004 to August 2008, were included in this study. All were HLA-A,-B, and -DRB1 typified via SSP PCR. Allele, genotype and haplotype frequencies were estimated with STATA Software Version 9.0 and the GENEPOP genetic analysis package. Results: 19, 28, and 15 different alleles were identified for loci HLA-A,-B and -DRB1, respectively. Alleles found most frequently were A*24 (26.2%, A*02 (26%, B*35(22.7%, and DRB1*04 (24%. The most frequent genotypes were A*02,24 (14.2%, B*07,35 (5.5%, DRB1*01,04, and DRB1*04,04 (6.9%; while most the frequent haplotypes were HLA A*24, B*35 (9.2%, A*24, DRB1*04 (8.1%; B*35, DRB1*04 (7.8%, A*2 DRB1*04 (7.4%. Conclusion: The results obtained provide a useful reference framework for the population studied, allowing compatibility probability calculations to be performed for organ transplants.

  10. Alloactivated HLA class II-positive T-cell lines induce IL-2 reactivity but lack accessory cell function in mixed leukocyte culture

    DEFF Research Database (Denmark)

    Odum, N; Dickmeiss, E; Hofmann, B

    1989-01-01

    ). From 70 to 90% of the Ta were HLA class II-positive as judged by the reactions with HLA class II-reactive monoclonal antibodies, and the Ta carried the DR allospecificities of the original T-cell donor when typed in the microcytotoxic test using DR-specific alloantisera. Neither irradiated nor...

  11. B cell antigens of the HLA system: a simple serotyping technique based on non-cytotoxic anti-beta2-microglobulin reagents.

    Science.gov (United States)

    Bernoco, D; Bernoco, M; Ceppellini, R; Poulik, M D; Leeuwen, A; Rood, J J

    1976-10-01

    A modification of the NIH cytotoxicity test for recognizing B cell (D-associated) antigens and antibodies, when sera also contain anti-HLA(ABC) activity is described. The method is based on the observation that anti-beta2-microglobulin reagents are able to block lympholysis only when due to HLA(ABC) antigens.

  12. Intermediate steroid withdrawal after renal transplantation and anti-HLA antibodies (HLA-Abs development

    Directory of Open Access Journals (Sweden)

    Elena Monfá

    2017-07-01

    Conclusions: Steroid withdrawal at 7 months of renal transplantation does not entail a higher risk in terms of HLA-Abs development in patients without pretransplant HLA-Abs and treatment with tacrolimus and MMF, although larger studies are needed to confirm these findings.

  13. HLA-B*44 Is Associated with Dengue Severity Caused by DENV-3 in a Brazilian Population

    Directory of Open Access Journals (Sweden)

    Liciana Xavier Eurico de Alencar

    2013-01-01

    Full Text Available Human leukocyte antigen (HLA alleles have been correlated with susceptibility or resistance to severe dengue; however, few immunogenetic studies have been performed in Latin American (LA populations. We have conducted immunogenetic studies of HLA class I and II alleles in a cohort of 187 patients with DENV-3 infection and confirmed clinical diagnosis of either severe dengue, known as dengue hemorrhagic fever (DHF, or the less severe form, dengue fever (DF, in Recife, Pernambuco, Brazil. An association analysis was performed using Fisher’s association test, with odds ratios (ORs calculated using conditional maximum likelihood estimates. HLA-B*44 (P=0.047, OR = 2.025, 95% CI = 0.97–4.24 was found to be associated with increased susceptibility to DHF in response to DENV-3 infection. In addition, HLA-B*07 (P=0.048, OR = 0.501, one-sided 95% CI = 0–0.99 and HLA-DR*13 (P=0.028, OR = 0.511, one-sided 95% CI = 0–0.91 were found to be associated with resistance to secondary dengue infection by DENV-3. These results suggest that HLA-B*44 supertype alleles and their respective T-cell responses might be involved in susceptibility to severe dengue infections, whereas the HLA-B*07 supertype alleles and DR*13 might be involved in cross-dengue serotype immunity.

  14. Survival Assessment of Mouse Preimplantation Embryos After Exposure to Cell Phone Radiation

    Science.gov (United States)

    Safian, Fereshteh; Khalili, Mohammad Ali; Khoradmehr, Arezoo; Anbari, Fatemeh; Soltani, Saeedeh; Halvaei, Iman

    2016-01-01

    Background: Using cellular phone has rapidly increased all over the world. Also, the concern on the possible health hazards of electromagnetic fields (EMF) induced from cell phones to reproduction has been growing in many countries. The aim of this study was to assess the consequences and effects of exposure to the cell phone radiation on the quality and survival rates of preimplantation embryos in mice. Methods: A total of 40 mice (20 females and 20 males), 6 weeks old and sexually mature BALB/c, were used for control and experimental groups. The ovary burses were removed and the zygotes were dissected in the morning after mating. Next, 2-cell embryos were divided into two groups of control (n=150) and experimental (n=150). EMF (900–1800 MHz) was used for four days in experimental group for 30 min/day in culture at 37°C in a CO 2 incubator. The quality of embryos was recorded daily and the fluorescent staining was used for identification of viable blastocysts. All data were compared by Student’s t-test and Mann-Whitney test (p<0.05). Results: The rate of embryo survival to the blastocysts stage was similar in both groups. However, the percentage of dead embryos at the 2-cell stage was significantly higher in EMF-exposed group compared with controls (p=0.03). Also, the loss of cell viability significantly increased in experimental blastocysts (p=0.002). Conclusion: The normal embryonic development up to the blastocyst stage indicates that EMF-exposure commonly did not have adverse effect on embryo development in mice. But, it caused loss of blastocysts cell viability. PMID:27478766

  15. HLA-B27 frequency in a group of patients with psoriatic arthritis Freqüência de HLA-B27 em uma amostra de pacientes com artrite psoriática

    Directory of Open Access Journals (Sweden)

    Danilo Garcia Ruiz

    2012-12-01

    Full Text Available BACKGROUND: HLA-B27 is associated with spondyloarthritis, a group of diseases that includes psoriatic arthritis. OBJECTIVES: To describe the HLA-B27 frequency in a group of Brazilian patients with psoriatic arthritis and correlate its presence or absence with their clinical manifestations. METHODS: Cross-sectional study with 44 psoriatic arthritis patients of a Rheumatology clinic. Demographic and social data were recorded, as were skin and joints clinical examination. HLA-B27 was tested. All data were processed descriptively and comparatively by appropriate software. Parametric and non parametric tests were used with 5% statistical significance. RESULTS: HLA-B27 was negative in 32 of the 44 patients (72,7%. Most of them were male, Caucasian, living in Rio de Janeiro, with plaque type psoriasis and average age of 52,9 years. There was statistical significant correlation between positive HLA-B27 and male gender (p=0,004. Negative HLA-B27 had a tendency to correlate with hands and wrists arthritis (p=0,07. There was an inverse significant correlation between HLA values and Schöber's test (p=0,02. CONCLUSION: Although HLA-B27 is negative in most of patients, it is significantly associated to male gender and inversely correlated with Schöber's test.FUNDAMENTOS: O HLA-B27 está associado às espondiloartrites, grupo de doenças que engloba, entre outras, a artrite psoriásica. OBJETIVOS: Descrever a freqüência de HLA-B27 em uma amostra de pacientes brasileiros com artrite psoriásica e correlacionar sua presença ou ausência com as manifestações clínicas dos mesmos. MÉTODOS: Estudo transversal avaliando 44 pacientes com artrite psoriásica de um ambulatório de Reumatologia. A avaliação consistia em registro de informações demográficas e sociais, exame clínico da pele e das articulações e pesquisa de HLA-B27. Os dados gerados foram tratados por meio de estatística descritiva e comparativa em Software apropriado. Foram utilizados

  16. Induction of HLA-G expression in a melanoma cell line OCM-1A following the treatment with 5-aza-2'-deoxycytidine

    Institute of Scientific and Technical Information of China (English)

    Wei Hua YAN; Ai Fen LIN; Chien Chung CHANG; Soldano FERRONE

    2005-01-01

    The non-classical HLA class I antigen HLA-G is an immune modulator which inhibits the functions of T cells,NK cells,and the Dendritic cells (DC).As a result,HLA-G expression in malignant cells may provide them with a mechanism to escape the immune surveillance.In melanoma,HLA-G antigen expression has been found in 30% of surgically removed lesions but in less than 1% of established cell lines.One possible mechanism underlying the differential HLAG expression in vivo and in vitro is that the HLA-G gene is epigenetically repressed in melanoma cells in vitro.To test this hypothesis,we treated the HLA-G negative melanoma cell line OCM-1A with the DNA methyltransferase inhibitor 5-aza-2'-deoxycytidine (5-AC) and analyzed whether HLA-G expression can be restored.Our data strongly suggest that HLA-G is silenced as a result of CpG hypermethylation within a 5' regulatory region encompassing 220 bp upstream of the start codon.After treatment,HLA-G mRNA expression was dramatically increased.Western blot and flow cytometry showed that HLA-G protein was induced.Interestingly,HLA-G cell surface expression on the 5-AC treated OCM-1A cells is much less than that on the HLA-G positive JEG-3 cells while a similar amount of total HLA-G was observed.Possible mechanisms for the difference were analyzed in the study such as cell cold-treatment,peptide loading and antigen processing machinery components (APM) as well as β2 microglobulin (β2-m) expression.Data revealed that the APM component calreticulin might be involved in the lower HLA-G surface expression on OCM-1A cells.Taken together,our results indicated that DNA methylation is an important epigenetic mechanism by which HLA-G antigen expression is modulated in melanoma cells in vitro. Furthermore,to the first time, we hypothesized that the deficiency of calreticulin might be involved in the low HLA-G surface expression on the 5-AC treated OCM-lA cells.

  17. Identification of conserved and HLA-A*2402-restricted epitopes in Dengue virus serotype 2.

    Science.gov (United States)

    Duan, Zhi-Liang; Liu, Hui-Fang; Huang, Xi; Wang, Si-Na; Yang, Jin-Lin; Chen, Xin-Yu; Li, De-Zhou; Zhong, Xiao-Zhi; Chen, Bo-Kun; Wen, Jin-Sheng

    2015-01-22

    In this study, we set out to identify dengue virus serotype 2 (DENV-2)-specific HLA-A*2402-restricted epitopes and determine the characteristics of T cells generated to these epitopes. We screened the full-length amino-acid sequence of DENV-2 to find potential epitopes using the SYFPEITHI algorithm. Twelve putative HLA-A*2402-binding peptides conserved in hundreds of DENV-2 strains were synthesized, and the HLA restriction of peptides was tested in HLA-A*2402 transgenic mice. Nine peptides (NS4b(228-237), NS2a(73-81), E(298-306), M(141-149), NS4a(96-105), NS4b(159-168), NS5(475-484), NS1(162-171), and NS5(611-620)) induced high levels of peptide-specific IFN-γ-secreting cells in HLA-A*2402 transgenic mice. Apart from IFN-γ, NS4b(228-237-), NS2a(73-81-) and E(298-306)-specific CD8(+) cells produced TNF-α and IL-6 simultaneously, whereas M(141-149-) and NS5(475-484-) CD8(+) cells produced only IL-6. Moreover, splenic mononuclear cells (SMCs) efficiently recognized and killed peptide-pulsed splenocytes. Furthermore, each of nine peptides could be recognized by splenocytes from DENV-2-infected HLA-A*2402 transgenic mice. The SMCs from HLA-A*2402 transgenic mice immunized with nine immunogenic peptides efficiently killed DENV-2-infected splenic monocytes. The present identified epitopes have the potential to be new diagnostic tools for characterization of T-cell immunity in DENV infection and may serve as part of a universal epitope-based vaccine.

  18. Microfluidic Protocol for pre-implantation culture of single mammalian embryos: towards and optimal culture protocol

    NARCIS (Netherlands)

    Esteves, Telma C.; Rossem, van Fleur; Boiani, Michele; Berg, van den Albert; Le Gac, Séverine

    2011-01-01

    Microfluidics holds great potential for the field of assisted reproduction techniques (ART), to provide integrated platforms for combined embryo culture and characterization. The development of mouse embryos is not impaired in a microfluidic format: it proceeds faster during the pre-implantation per

  19. Maternal Diabetes Leads to Unphysiological High Lipid Accumulation in Rabbit Preimplantation Embryos

    NARCIS (Netherlands)

    Schindler, Maria; Pendzialek, Mareike; Santos, Alexander Navarrete; Ploesch, Torsten; Seyring, Stefanie; Guerke, Jacqueline; Haucke, Elisa; Knelangen, Julia Miriam; Fischer, Bernd; Santos, Anne Navarrete

    2014-01-01

    According to the "developmental origin of health and disease" hypothesis, the metabolic set points of glucose and lipid metabolism are determined prenatally. In the case of a diabetic pregnancy, the embryo is exposed to higher glucose and lipid concentrations as early as during preimplantation devel

  20. Neurological Condition of Infants Born After In Vitro Fertilization With Preimplantation Genetic Screening

    NARCIS (Netherlands)

    Middelburg, Karin J.; Heineman, Maas J.; Haadsma, Maaike L.; Bos, Arend F.; Kok, Joke H.; Hadders-Algra, Mijna

    2010-01-01

    Aim of this study was to evaluate the effect of preimplantation genetic screening (PGS) on neurodevelopmental outcome in children. We conducted a prospective follow-up Study of children born to women randomly assigned to in vitro fertilization with or without PGS. Primary outcome was adverse neurolo

  1. Toward an ethical eugenics: the case for mandatory preimplantation genetic selection.

    Science.gov (United States)

    Appel, Jacob M

    2012-01-01

    Preimplantation genetic diagnosis offers the possibility of screening and terminating embryos with severe and life-threatening disabilities. This article argues that under certain conditions, the use of this technology is not merely desirable as a means to reduce human suffering but also an ethically required duty of a parent to a potential child.

  2. The theological and legal approach of prenatal and preimplantation genetic control

    Directory of Open Access Journals (Sweden)

    George Katsimigas

    2012-04-01

    Full Text Available Aim: The investigation of the theological and legal questions derived from the application of prenatal and preimplantation genetic control on human embryos. Moreover, the review of the European and Greek legislation with regard to the prenatal and preimplantation control. Material and Method: A literature review based on both review and research literature, conducted during the period of 1984-2009, derived from MEDLINE, SCOPUS and ΙΑΤΡΟΤΕΚ databases using as key words Prenatal diagnosis , Bioethics, Orthodox ethics, preimplantation genetic diagnosis, Legislation. Results: The orthodox theology adopts a negative view for the abortion of fetus, which it is considered murder in any stage of growth. The legal approach brought two basic questions a the securing of consent from the examined individual and b the constitutional protection of fetus' life. Conclusions: The orthodox theology, through their teaching places the moral criteria for facing the moral questions derived from the application of prenatal and preimplantation genetic control on human embryos. Also, the Greek citizens need to be informed for all the diagnostic examinations on embryos that should be provided by all public health organizations.

  3. Maternal Diabetes Leads to Unphysiological High Lipid Accumulation in Rabbit Preimplantation Embryos

    NARCIS (Netherlands)

    Schindler, Maria; Pendzialek, Mareike; Santos, Alexander Navarrete; Ploesch, Torsten; Seyring, Stefanie; Guerke, Jacqueline; Haucke, Elisa; Knelangen, Julia Miriam; Fischer, Bernd; Santos, Anne Navarrete

    According to the "developmental origin of health and disease" hypothesis, the metabolic set points of glucose and lipid metabolism are determined prenatally. In the case of a diabetic pregnancy, the embryo is exposed to higher glucose and lipid concentrations as early as during preimplantation

  4. Dynamics of zonula occludens-2 expression during preimplantation embryonic development in the hamster.

    Science.gov (United States)

    Wang, Hehai; Luan, Liming; Ding, Tianbing; Brown, Naoko; Reese, Jeff; Paria, B C

    2011-09-01

    The objective was to study the expression of zonula occludens-2, a tight junction protein, during preimplantation hamster embryonic development, to predict its possible localization, source, and roles in trophectoderm differentiation and blastocyst formation in this species. Comparison of zonula occludens-2 expression pattern between the hamster and mouse preimplantation embryos from the zygote up to the blastocyst stage was also an objective of this study. Zonula occludens-2 localization was noted in nuclei of blastomeres in all stages of hamster and mouse embryonic development. Compared to mice, where zonula occludens-2 was first localized in the interblastomere membrane at the morula stage, hamster embryos had membranous zonula occludens-2 localization from the 2-cell stage onwards. Based on combined results of immunolocalization study in parthenogenic embryos and ovarian and epididymal sections, and quantitative PCR done in oocytes and all developmental stages of preimplantation embryos, perhaps there was a carry-over of zonula occludens-2 proteins or mRNA from the dam to the embryo. Based on these findings, we inferred that maternally derived zonula occludens-2 was involved in nuclear functions, as well as differentiation of blastomeres and blastocoel formation during preimplantation embryonic development in the hamster.

  5. Impact of maternal malnutrition during the periconceptional period on mammalian preimplantation embryo development.

    Science.gov (United States)

    Velazquez, M A

    2015-04-01

    During episodes of undernutrition and overnutrition the mammalian preimplantation embryo undergoes molecular and metabolic adaptations to cope with nutrient deficits or excesses. Maternal adaptations also take place to keep a nutritional microenvironment favorable for oocyte development and embryo formation. This maternal-embryo communication takes place via several nutritional mediators. Although adaptive responses to malnutrition by both the mother and the embryo may ensure blastocyst formation, the resultant quality of the embryo can be compromised, leading to early pregnancy failure. Still, studies have shown that, although early embryonic mortality can be induced during malnutrition, the preimplantation embryo possesses an enormous plasticity that allows it to implant and achieve a full-term pregnancy under nutritional stress, even in extreme cases of malnutrition. This developmental strategy, however, may come with a price, as shown by the adverse developmental programming induced by even subtle nutritional challenges exerted exclusively during folliculogenesis and the preimplantation period, resulting in offspring with a higher risk of developing deleterious phenotypes in adulthood. Overall, current evidence indicates that malnutrition during the periconceptional period can induce cellular and molecular alterations in preimplantation embryos with repercussions for fertility and postnatal health. Copyright © 2015 Elsevier Inc. All rights reserved.

  6. Ethical attitudes of German specialists in reproductive medicine and legal regulation of preimplantation sex selection in Germany.

    Directory of Open Access Journals (Sweden)

    Miriam Wilhelm

    Full Text Available BACKGROUND: Because of its ethical and social implications, preimplantation sex selection is frequently the subject of debates. METHODS: In 2006, we surveyed specialists in reproductive medicine in Germany using an anonymous questionnaire, including sociodemographic data and questions regarding ethical problems occurring in the practice of reproductive medicine. Most questions focused on preimplantation sex selection, including 10 case vignettes, since these enabled us to describe the most difficult and ethically controversial situations. This is the first survey among specialists in reproductive medicine regarding this topic in Germany. RESULTS: 114 specialists in reproductive medicine participated, 72 males (63% and 42 females (37%, average age was 48 years (age range 29-67 years. The majority of respondents (79% favoured a regulation that limits the use of preimplantation sex selection only for medical reasons, such as X-linked diseases (including 18%: summoning an ethics commission for every case. A minority of 18% approved of the use of sex selection for non-medical reasons (4% generally and further 14% for family balancing. 90% had received obvious requests from patients. The highest approval (46% got the counselling guideline against a preimplantation sex selection and advising a normal pregnancy, if preimplantation sex selection would be allowed in Germany. The majority (67% was opposed the personal use of preimplantation sex selection for non-medical reasons, but would think about it in medical cases. In opposite to woman, 14% of the men were in favour of personal use for non-medical reasons (p=0,043. 25% of specialists in reproductive medicine feared that an allowance of preimplantation sex selection would cause a shift in the sex ratio. CONCLUSIONS: The majority of German specialists in reproductive medicine opposes preimplantation sex selection for non-medical reasons while recommending preimplantation sex selection for medical

  7. Frequency of null allele of Human Leukocyte Antigen-G (HLA-G) locus in subjects to recurrent miscarriage

    Science.gov (United States)

    Alizadeh, Nazila; Mosaferi, Elnaz; Farzadi, Laya; Majidi, Jafar; Monfaredan, Amir; Yousefi, Bahman; Baradaran, Behzad

    2016-01-01

    Background: Human leukocyte antigen-G (HLA-G) is a non-classical class I molecule highly expressed by extravillous cytotrophoblast cells. Due to a single base pair deletion, its function can be compensated by other isoforms. Investigating the frequency of null allele in Recurrent Miscarriage (RM) subjects could be useful in understanding the relationship between frequency of this allele and RM in a given population. Objective: This study aimed to determine the frequency of HLA-G*0105N null allele and its potential association with down-regulation of HLA-G in subjects with RM. Materials and Methods: Western blotting was used to assess the level of HLA-G protein expression. For investigating the frequency of HLA-G*0105N null allele in RM subjects, PCR-RFLP method was used. Exon 3 of HLA-G gene was amplified by polymerase chain reaction (PCR). Subsequently, PpuM-1 enzyme was employed to digest the PCR products and fragments were analyzed using gel electrophoresis. Results: Digestion using restriction enzyme showed the presence of heterozygous HLA-G*0105N null allele in 10% of the test population. Western blotting results confirmed the decrease in expression of HLA-G in the placental tissue of subjects with RM compared to subjects who could give normal birth. Conclusion: The frequency of heterozygous HLA-G*0105N null allele was high to some extent in subjects with RM. The mutation rate in subjects suggested that there is a significant association between RM and frequency of mutations in this allele. PMID:27525330

  8. Association between HLA-DQA1, -DQB1 gene polymorphisms and susceptibility to asthma in northern Chinese subjects

    Institute of Scientific and Technical Information of China (English)

    高金明; 林耀广; 邱长春; 刘怡雯; 马毅; 刘英

    2003-01-01

    Objective Human leukocyte antigen (HLA) class Ⅱ genes, especially HLA-DQ genes, which are highly polymorphic, have been thought to be candidate loci for the etiology of asthma, and shown to be involved in antigenic presentation. This study was conducted to investigate whether susceptibility or resistance to asthma is associated with HLA-DQA1 and DQB1 genes polymorphism.Methods Venous blood samples were collected from northern Chinese population with Han ethnic. (1) One hundred and twenty-five unrelated asthmatic individuals and 52 subjects from 12 asthmatic pedigrees. (2) Ninety-six healthy controls without asthma and atopy with the same ethnic. Genomic DNA was extracted using standard phenol-chloroform method. The second exon of HLA-DQA1 and DQB1 genes were amplified by sequence-specific primer-polymerase chain reaction (SSP-PCR) method. All asthmatics had their serum IgE (total and specific) antibody or skin-prick test measured, bronchial reactivity to methacholine (Mch) and bronchial reversibility by β2-agonist evaluated.Results HLA-DQA1*0104 allele and HLA-DQB1*0201 allele were significantly higher in asthmatics than those in healthy controls (0.408 vs 0.177, P<0.01; 0.568 vs 0.198, P<0.01). Odds ratios (ORs) were 3.203 (95% CI 1.699-6.037), 5.328 (95% CI 2.883-9.849) respectively. Conversely, HLA-DQA1*0301 allele and HLA-DQB1*0301 were significantly decreased in asthmatics compared to healthy controls (0.296 vs 0.50, P<0.01; 0.4 vs 0.563, P<0.05); Logistic regression analysis showed that HLA-DQA1*0104 allele was associated independently with asthma etiology, OR [represented by Exp(B)] was 5.0942 with 95% CI 2.2520-21.1813; Spearman's analysis showed that HLA-DQA1*0104 allele and HLA-DQB1*0201 allele were positively associated with atopy, the correlation coefficient were 0.183 and 0.289 respectively, P<0.01. By contrast, HLA-DQA1*0301 allele was negatively related to atopy, the correlation coefficient was -0.168, P<0.05; linkage analysis did not support the

  9. Frequency of class I anti-HLA alloantibodies in patients infected by HIV-1

    Directory of Open Access Journals (Sweden)

    Elza Regina Manzolli Leite

    2010-02-01

    Full Text Available The aim of this study was to evaluate the presence of class I anti-HLA alloantibodies in patients infected by HIV-1 and relate it with the different clinical courses of the disease. Blood samples were collected in EDTA tubes from 145 individuals. HIV-1 infection was confirmed by ELISA test. The presence of class I anti-HLA alloantibodies and HLA allele's were determined. Clinical evolution was set as fast (3 years. Class I anti-HLA alloantibodies presence was lower in healthy individuals than in those infected by HIV-1 (4.2% against 32.4%. However, an equal distribution of these alloantibodies was found among the individuals infected, independent on the clinical evolution. Thus, class I anti-HLA alloantibodies was not a determinant factor for patient worsening.O objetivo deste estudo foi avaliar a presença de aloanticorpos anti-HLA classe I em pacientes infectados pelo HIV-1 e relacioná-la aos diferentes cursos clínicos da doença. Amostras de sangue de 145 indivíduos HIV positivo foram coletadas em tubos com EDTA. A infecção pelo HIV-1 foi confirmada por teste ELISA e a presença de aloanticorpos anti-HLA classe I determinada em seguida. A evolução clínica foi definida como rápida (3 anos. A presença de aloanticorpos anti-HLA classe I foi menor em indivíduos saudáveis em relação aos infectados pelo HIV-1 (4,2% contra 32,4%. Porém, a distribuição destes aloanticorpos entre os indivíduos infectados foi igual, independente da evolução clínica. Deste modo, a presença de aloanticorpos anti-HLA classe I não é um fator determinante na piora clínica do paciente.

  10. Expression of growth factor ligand and receptor genes in the preimplantation bovine embryo.

    Science.gov (United States)

    Watson, A J; Hogan, A; Hahnel, A; Wiemer, K E; Schultz, G A

    1992-02-01

    The sensitive technique of mRNA phenotyping with the reverse transcription-polymerase chain reaction was employed to determine the patterns of gene expression for several growth factor ligand and receptor genes during bovine preimplantation development. Several thousand bovine embryos encompassing a developmental series from one-cell zygotes to hatched blastocysts were produced by the application of in vitro maturation, fertilization, and oviductal epithelial cell embryo coculture methods. Transcripts for transforming growth factor (TGF-alpha) and platelet-derived growth factor (PDGF-A) are detectable in all preimplantation bovine stages as observed in the mouse. Transcripts for TGF-beta 2 and insulin-like growth factor (IGF-II) and the receptors for PDGF-alpha, insulin, IGF-I, and IGF-II are also detectable throughout bovine preimplantation development, suggesting that these mRNAs are products of both the maternal and the embryonic genomes in the cow, whereas in the mouse they are present only following the activation of the embryonic genome at the two-cell stage. In contrast to the mouse embryo, IGF-I mRNA was detected within preimplantation bovine embryos. Basic fibroblast growth factor (bFGF) is a maternal message in the bovine embryo, since it is only detectable up until the eight-cell embryo stage. Bovine trophoblast protein (bTP) mRNA was detectable within day 8 bovine blastocysts. As was observed in the mouse, the transcripts for insulin, epidermal growth factor (EGF), or nerve growth factor (NGF) were not detectable in any bovine embryo stage. Analyses of this type should aid the development of a completely defined culture medium for the more efficient production of preimplantation bovine embryos.

  11. Low-cost, simultaneous, single-sequence genotyping of the HLA-A, HLA-B and HLA-C loci.

    Science.gov (United States)

    Abbott, W G H; Tukuitonga, C F; Ofanoa, M; Munn, S R; Gane, E J

    2006-07-01

    New automated DNA sequencing technology has enabled the development of an assay for genotyping the three major HLA class 1 loci from a single sequence of each gene containing exon 3, intron 2 and exon 2. The assay allows 31 subjects (with 3 negative controls) to be genotyped at all three loci simultaneously, using a 96-well plate format. Genotypes were assigned by comparing each sequence to a database of 307 HLA-A, 563 HLA-B and 166 HLA-C alleles. Unequivocal, 4-digit allele assignments were made for 40 of 130 HLA-A genes, 82 of 130 HLA-B genes and 97 of 130 HLA-C genes from 21 European, 20 Tongan and 24 Niuean subjects. Ambiguity in interpretation of the sequence contributed to 66 of the 170 equivocal allele assignments, and 105 equivocal assignments were due to polymorphisms outside exons 2 and 3. All known alternative interpretations of ambiguous genotypes were identified, and seven HLA-B and two HLA-C ambiguities were resolved by reading the out-of-phase exon 2 sequence that followed an indel in intron 2. The genotypes of a subgroup of 27 heterozygous subjects, whose genotypes contained all of the alleles identified in this study, were confirmed with commercial, generic PCR-SSP typing. In European subjects, the repertoire of HLA-B/HLA-C haplotypes was almost identical to previously published data. We identified five new HLA-B/HLA-C haplotypes in the Polynesian subjects, and the remaining haplotypes were of Asian origin. In summary, we are describing a low-cost, sequencing assay for the three major HLA class I loci that provides a level of resolution that is comparable with a commercial PCR-SSP assay.

  12. HLA-DQA1 and HLA-DQB1 alleles and haplotypes in two Brazilian Indian tribes: evidence of conservative evolution of HLA-DQ.

    Science.gov (United States)

    Sotomaior, V S; Faucz, F R; Schafhauser, C; Janzen-Dück, M; Boldt, A B; Petzl-Erler, M L

    1998-08-01

    Nucleotide sequence polymorphism of the HLA-DQA1 and HLA-DQB1 class II genes was analyzed in the Kaingang and Guarani Amerindians from southern Brazil using PCR sequence-specific oligonucleotide typing methods. Four different DQA1-DQB1 haplotypes were found: DQA1*0401-DQB1*0402 (associated with DRB1*0802, DRB1*08041, and DRB1*0807), DQA1*0501-DQB1*0301 (associated with DRB1*1602, DRB1*1413, and DRB1*1402), DQA1*03-DQB1*0302 (associated with DRB1*0404 and DRB1*0411), and DQA1*03-DQB1*03032 (associated with DRB1*09012). These HLA-DQA1 and HLA-DQB1 alleles and haplotypes are common in many other populations of all major ethnic groups. Alleles and haplotypes introduced into the populations by post-Columbian admixture were seen at low frequency both in the Kaingang (3.2%) and in the Guarani (3.8%). No novel HLA-DQA1 and HLA-DQB1 alleles have thus far been identified in Amerindians. This differs from previous results for HLA-DRB1, another class II locus presenting novel alleles (i.e., alleles not found in other ethnic groups and probably generated after migration of paleo-Indians to the Americas) in the Guarani and in other South American Indian populations. The distribution of the HLA-DQ alleles and haplotypes in Amerindians indicates a weaker diversifying selective pressure on the HLA-DQ genes compared with HLA-DRB1 and HLA-B. The more conservative evolution of HLA-DQA1 and HLA-DQB1 compared with HLA-DRB1 is strong evidence of (still not well-defined) functional differences of these class II genes.

  13. Intermediate steroid withdrawal after renal transplantation and anti-HLA antibodies (HLA-Abs) development.

    Science.gov (United States)

    Monfá, Elena; San Segundo, David; San Millán, Juan Carlos Ruiz; Sanabria, Judith; Albines, Zoila; Rodrigo, Emilio; Romón, Iñigo; Asensio, Esther; Arias, Manuel; López-Hoyos, Marcos

    Steroid withdrawal in renal transplantation is desirable to avoid their adverse effects. However, by decreasing the immunosuppression, could lead to an increased risk for the development of HLA-Abs. Evaluate the relationship between steroid withdrawal and development of HLA-Abs in renal transplantation. We analyzed sera by Luminex from 182 kidney transplants performed from 1998 to 2011, before and two years after transplantation. All the patients had a pretransplant PRA (panel reactive of antibodies) 20%, we detected HLA-Abs pretransplant by Luminex in 11.5% of patients in both groups, of which, 66.6%, versus 53% (p 0.058), developed new specificities, with a similar percentage of donor specific antibodies (DSA) in both groups (33.33% vs 36.36%), pNS. In the subgroup without pretransplant HLA-Abs (group-I; n=115, group-II; n=45), 6.08% developed de novo HLA-Abs, being DSA 3.4% (Group-I) versus 7.69% in group II with 3.84% DSA (pNS). Steroid withdrawal at 7 months of renal transplantation does not entail a higher risk in terms of HLA-Abs development in patients without pretransplant HLA-Abs and treatment with tacrolimus and MMF, although larger studies are needed to confirm these findings. Copyright © 2017 Sociedad Española de Nefrología. Published by Elsevier España, S.L.U. All rights reserved.

  14. Donor-specific HLA antibodies in chronic renal allograft rejection: a prospective trial with a four-year follow-up.

    Science.gov (United States)

    Lachmann, Nils; Terasaki, Paul I; Schönemann, Constanze

    2006-01-01

    A total of 1,043 serum samples of kidney allograft recipients with functioning grafts at a mean of 6 years after transplantation were tested once for HLA abs and monitored for graft and patient survival for 4 years after testing. All grafts were transplanted between 1984 and 2004 at the Charité hospital (Berlin, Germany). 1. To our knowledge this is the first study with more than 1,000 patients designed to elucidate the impact of DSA and NDSA on late renal graft outcome. True donor specificity of HLA abs in 30% of antibody positive patients was determined by using a single HLA antigen coated bead assay. 2. The long-term graft survival was adversely impacted by the presence of HLA abs directed against mismatched HLA antigens and to a lesser extent also by NDSA. This difference was shown to be leveled at late stages of graft damage, suggesting NDSA as a predictor of adsorbed DSA killing the graft. 3. The deleterious effect of preexisting and de novo formed HLA abs on long-term graft function was shown to be equal. Despite a negative crossmatch at the time of transplantation sensitized recipients and those who produced HLA abs de novo posttransplant showed the same increased risk of late graft failure. 4. Among patients with DSA and additional NDSA the majority of 74% of assigned potential HLA class I epitopes were shared among DSA and NDSA suggesting mismatched donor antigens as the cause of detected NDSA.

  15. Extended HLA-D region haplotype associated with celiac disease

    Energy Technology Data Exchange (ETDEWEB)

    Howell, M.D.; Smith, J.R.; Austin, R.K.; Kelleher, D.; Nepom, G.T.; Volk, B.; Kagnoff, M.F.

    1988-01-01

    Celiac disease has one of the strongest associations with HLA (human leukocyte antigen) class II markers of the known HLA-linked diseases. This association is primarily with the class II serologic specificities HLA-DR3 and -DQw2. The authors previously described a restriction fragment length polymorphism (RFLP) characterized by the presence of a 4.0-kilobase Rsa I fragment derived from an HLA class II ..beta..-chain gene, which distinguishes the class II HLA haplotype of celiac disease patients from those of many serologically matched controls. They now report the isolation of this ..beta..-chain gene from a bacteriophage genomic library constructed from the DNA of a celiac disease patient. Based on restriction mapping and differential hybridization with class II cDNA and oligonucleotide probes, this gene was identified as one encoding an HLA-DP ..beta..-chain. This celiac disease-associated HLA-DP ..beta..-chain gene was flanked by HLA-DP ..cap alpha..-chain genes and, therefore, was probably in its normal chromosomal location. The HLA-DP..cap alpha..-chain genes of celiac disease patients also were studied by RFLP analysis. Celiac disease is associated with a subset of HLA-DR3, -DQw2 haplotypes characterized by HLA-DP ..cap alpha..- and ..beta..-chain gene RFLPs. Within the celiac-disease patient population, the joint segregation of these HLA-DP genes with those encoding the serologic specificities HLA-DR3 and -DQw2 indicates: (i) that the class II HLA haplotype associated with celiac disease is extended throughout the entire HLA-D region, and (ii) that celiac-disease susceptibility genes may reside as far centromeric on this haplotype as the HLA-DP subregion.

  16. Role of HLA-DR Alleles to Increase Genetic Susceptibility to Onychomycosis in Nail Psoriasis

    Science.gov (United States)

    Carrillo-Meléndrez, Hilda; Ortega-Hernández, Esteban; Granados, Julio; Arroyo, Sara; Barquera, Rodrigo; Arenas, Roberto

    2016-01-01

    Background Patients with nail psoriasis have an increased risk of onychomycosis. Previous studies suggest it may be due to structural changes of the nails. However, a genetic predisposition seems to be also at play. Objective To determine a genetic susceptibility for onychomycosis in nails with changes of psoriasis. Methods This is a prospective case-control study of patients with suggestive changes of nail psoriasis with onychomycosis (cases) and without onychomycosis (controls) confirmed by mycological tests. HLA typing was performed in all of them by sequence-specific primers. Results Twenty-five patients and 20 controls with a mean age of 50 years (range 37-72 years) were studied. HLA-DRB1*08 was found in 12 cases (48%) and only 3 controls (15%) [p < 0.033, odds ratio (OR) = 3.8, 95% confidence interval (CI): 0.9-19]. HLA-DR1 was found in 9 cases (36%) and only 1 control (5%) (p < 0.023, OR = 8.5, 95% CI: 1-188). Conclusion HLA-DR*08 and HLA-DR*01 probably increase the susceptibility to fungal infection in psoriasis-affected nails, but larger studies are required to confirm this observation. PMID:27843918

  17. Analysis of the contribution of HLA genes to genetic predisposition in inflammatory bowel disease

    Energy Technology Data Exchange (ETDEWEB)

    Naom, I.; Haris, I.; Hodgson, S.V.; Mathew, C.G. [and others

    1996-07-01

    Crohn disease (CD) and ulcerative colitis (UC) are chronic inflammatory bowel diseases (IBDs) of unknown etiology. First-degree relatives of IBD patients have a 10-fold increase in risk of developing the same disease, and distinct associations between specific HLA types and both CD and UC have been reported. We have evaluated the contribution of genes at the HLA locus to susceptibility in IBD by linkage analysis of highly informative microsatellite polymorphisms in 43 families with multiple affected cases. No evidence for linkage of HLA to IBD was obtained under any of the four models tested. Analysis of HLA haplotype sharing in affected relatives indicated that the relative risk to a sibling conferred by the HLA locus was 1.11 in UC and 0.75 in CD, with upper (95%) confidence limits of 2.41 and 1.37, respectively. This suggests that other genetic or environmental factors are responsible for most of the familial aggregation in IBD. 31 refs., 1 fig., 2 tabs.

  18. Anti-HLA antibody profile of Turkish patients with end-stage renal disease.

    Science.gov (United States)

    Karahan, G E; Seyhun, Y; Oguz, F; Kekik, C; Onal, E; Caliskan, Y; Bakkaloglu, H; Yazici, H; Turkmen, A; Aydin, A E; Sever, M S; Eldegez, U; Carin, M N

    2009-11-01

    Exposure to human leukocyte antigens (HLA) via blood transfusions, pregnancies, and previous transplantations can result in anti-HLA antibody production. The presence of anti-HLA antibodies in recipient sera before transplantation is an important risk factor. To demonstrate the anti-HLA antibody status of Turkish end-stage renal disease (ESRD) patients, 674 patients (mean age, 40.35 +/- 13.15 years; female/male, 328/346) were enrolled into the study. Anti-HLA antibody screening and identification tests were performed using an enzyme-linked immunosorbent assay (ELISA) method. The panel-reactive antibody (PRA)-negative group consisted of 564 (83.6%) and the PRA-positive group consisted of 110 (17.3%) patients. Of the 110 (17.3%) PRA-positive patients, 43 (6.4%) were class I (+) and class II (-); 19 (2.8%) were class I (-) and class II (+); 48 (7.1%) were both class I and II (+). The most frequent antibodies were directed against the A2 crossreactive group (CREG) and the A10 CREG with less frequent reactions against the B7 CREG, indicating antibodies to both frequent (members of A2 CREG) and relatively rare (members of A10 CREG and B7 CREG antigens). These data also suggested that some antibodies occur at greater than expected frequency because of shared epitopes. Our findings confirmed the significant correlation between female gender, pregnancy, failed graft history, long dialysis duration, and blood transfusions with PRA positivity (P < .05).

  19. The Pharmacogenomic HLA Biomarker Associated to Adverse Abacavir Reactions: Comparative Analysis of Different Genotyping Methods

    Science.gov (United States)

    Stocchi, Laura; Cascella, Raffaella; Zampatti, Stefania; Pirazzoli, Antonella; Novelli, Giuseppe; Giardina, Emiliano

    2012-01-01

    Many pharmacogenomic biomarkers (PGBM) were identified and translated into clinical practice, affecting the usage of drugs via label updates. In this context, abacavir is one of the most brilliant examples of pharmacogenetic studies translated into clinical practice. Pharmacogenetic studies have revealed that abacavir HSRs are highly associated with the major histocompatibility complex class I. Large studies established the effectiveness of prospective HLA-B*57:01 screening to prevent HSRs to abacavir. Accordingly to these results the abacavir label has been modified: the European Medicines Agency (EMA) and the FDA recommend/suggested that the administration of abacavir must be preceded by a specific genotyping test. The HLA locus is extremely polymorphic, exhibiting many closely related alleles, making it difficult to discriminate HLA-B*57:01 from other related alleles, and a number of different molecular techniques have been developed recently to detect the presence of HLA-B*57:01. In this review, we provide a summary of the available techniques used by laboratories to genotype HLA-B*57:01, outlining the scientific and pharmacoeconomics pros and cons. PMID:23204921

  20. HLA-A and HLA-B alleles associated in psoriasis patients from Mumbai, Western India

    Directory of Open Access Journals (Sweden)

    Shankarkumar Umapathy

    2011-01-01

    Full Text Available Background: Psoriasis, a common autoimmune disorder characterized by T cell-mediated keratinocyte hyperproliferation, is known to be associated with the presence of certain specific Human Leukocyte Antigen (HLA alleles. Aim: To evaluate distribution of HLA-A and HLA-B alleles and hence identify the susceptible allele of psoriasis from patients in Western India. Materials and Methods: The study design included 84 psoriasis patients and 291 normal individuals as controls from same geographical region. HLA-A and HLA-B typing was done using Serology typing. Standard statistical analysis was followed to identify the odds ratio (OR, allele frequencies, and significant P value using Graphpad software. Results: The study revealed significant increase in frequencies of HLA-A2 (OR-3.976, P<0.0001, B8 (OR-5.647, P<0.0001, B17 (OR-5.452, P<0.0001, and B44 (OR-50.460, P<0.0001, when compared with controls. Furthermore, the frequencies of HLA-A28 (OR-0.074, P=0.0024, B5 (OR-0.059, P<0.0001, B12 (OR-0.051, P=0.0002, and B15 (OR-0.237, P=0.0230 were significantly decreased in psoriasis patients. Conclusion: This study shows the strong association of HLA-A2, B8, and B17 antigens with psoriasis conferring susceptibility to psoriasis patients from Western India, while the antigens HLA-A28, B5, and B12 show strong negative association with the disease.

  1. Detection of Primary T Cell Responses to Drugs and Chemicals in HLA-Typed Volunteers: Implications for the Prediction of Drug Immunogenicity.

    Science.gov (United States)

    Faulkner, Lee; Gibson, Andrew; Sullivan, Andrew; Tailor, Arun; Usui, Toru; Alfirevic, Ana; Pirmohamed, Munir; Naisbitt, Dean J; Kevin Park, B

    2016-12-01

    A number of serious adverse drug reactions are caused by T cells. An association with HLA alleles has been identified with certain reactions, which makes it difficult to develop standardized preclinical tests to predict chemical liability. We have recently developed a T cell priming assay using the drug metabolite nitroso sulfamethoxazole (SMX-NO). We now report on reproducibility of the assay, establishment of a biobank of PBMC from 1000 HLA-typed volunteers, and generation of antigen-specific responses to a panel of compounds. Forty T cell priming assays were performed with SMX-NO; 5 gave weak responses (1.5-1.9) and 34 showed good (SI 2.0-3.9) or strong responses (SI  > 4.0) using readouts for proliferation and cytokine release. Thus, SMX-NO can be used as a model reagent for in vitro T cell activation. Good to strong responses were also generated to haptenic compounds (amoxicillin, piperacillin and Bandrowski's base) that are not associated with an HLA risk allele. Furthermore, responses were detected to carbamazepine (in HLA-B*15:02 donors), flucloxacillin (in 1 HLA-B*57:01 donor) and oxypurinol (in HLA-B*58:01 donors), which are associated with HLA-class I-restricted forms of hypersensitivity. In contrast, naïve T cell priming to ximelagatran, lumiracoxib, and lapatinib (HLA-class II-restricted forms of hypersensitivity) yielded negative results. Abacavir, which activates memory T cells in patients, did not activate naïve T cells from HLA-B*57:01 donors. This work shows that the priming assay can be used to assess primary T cell responses to drugs and to study mechanisms T cell priming for drugs that display HLA class I restriction. Additional studies are required to investigate HLA-class II-restricted reactions.

  2. Human leukocyte antigen (HLA)-G during pregnancy part II

    DEFF Research Database (Denmark)

    Dahl, Mette; Klitkou, Louise; Christiansen, Ole B

    2015-01-01

    1063320) polymorphism) in mother-child genotype combinations were associated with higher levels of sHLA-G at term in heterozygous 14DelC/14InsG mothers (p=0.005). In conclusion, the results indicate that there is an association between combined feto-maternal HLA-G genotypes and sHLA-G levels in maternal...

  3. Association study between HLA-DRB, HLA-DQA1, HLA-DQB1 and breast cancer in Iranian women

    Directory of Open Access Journals (Sweden)

    Amirzargar AA

    2010-11-01

    Full Text Available "n Normal 0 false false false EN-US X-NONE AR-SA MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:Arial; mso-bidi-theme-font:minor-bidi;} Background: Based on the reports, high frequency of special alleles of HLA class II genes might be associated with susceptibility to or protective from a particular cancer. These alleles might vary depending on the geographical region. Here we investigate the association between alleles of HLA class II genes and breast cancer in Iranian women."n"nMethods: 100 patients with pathologically proved breast cancer who referred to Cancer Institute, Tehran University of Medical Sciences in Tehran, Iran, were divided to two groups based on ages (40 years old and less/ or more than 40 years old and were randomly selected and compared with a group of 80 healthy blood donor subjects. HLA class II alleles were determined by amplification of DNA with polymerase chain reaction (PCR method followed by HLA-typing using sequence-specific primer (SSP for each allele."n"nResults: The most frequent alleles in the DR and DQ regions in group 1 (40 years old and less in comparison with control group were HLA-DQA1*0301 (p=0.002 and HLA-DQB1*0302 (p>0.05. In contrast HLA-DQA1*0505 (p=0.004 had significantly lower frequency in this group compared with control group. Patients of group two (more than 40 years old had a higher frequencies of HLA

  4. [HLA antigens in juvenile rheumatoid arthritis].

    Science.gov (United States)

    Rumba, I V; Sochnev, A M; Kukaĭne, E M; Burshteĭn, A M; Benevolenskaia, L I

    1990-01-01

    Antigens of I class HLA system (locus A and B) were investigated in 67 patients of Latvian nationality suffering from juvenile rheumatoid arthritis (JRA). Associations of HLA antigens with juvenile rheumatoid arthritis partially coincided with the ones revealed earlier. Typing established an increased incidence of antigen B27 (p less than 0.01) and gaplotype A2, B40 (p less than 0.01). Antigen B15 possessed a protective action with respect to JRA. Interlocus combinations demonstrated a closer association with the disease than a single antigen. The authors also revealed markers of various clinico-anatomical variants of JRA.

  5. Effect of ATM and HDAC Inhibition on Etoposide-Induced DNA Damage in Porcine Early Preimplantation Embryos: e0142561

    National Research Council Canada - National Science Library

    HaiYang Wang; YiBo Luo; ZiLi Lin; In-Won Lee; Jeongwoo Kwon; Xiang-Shun Cui; Nam-Hyung Kim

    2015-01-01

      Oocyte maturation and embryonic development are sensitive to DNA damage. Compared with somatic cells or oocytes, little is known about the response to DNA damage in early preimplantation embryos...

  6. Association between HLA-G genotype and risk of pre-eclampsia: a case-control study using family triads

    DEFF Research Database (Denmark)

    Hylenius, Sine; Andersen, Anne-Marie Nybo; Melbye, Mads;

    2004-01-01

    that it is caused by immune- maladaptation. The MHC class Ib gene, HLA-G, is expressed in the placenta and seems to have immunomodulatory functions. Aberrant HLA-G mRNA and protein expression in pre-eclamptic placentas have been reported. Here, we have investigated detailed HLA-G genotypes in a case-control study...... of 155 family triads of mother, father and newborn. Among primiparas, an overrepresentation of a homozygous HLA-G genotype was detected in the 40 pre-eclamptic offspring compared to the 70 controls [P = 0.002, Fisher's exact test; odds ratio 5.57 (95% CI 1.79-17.31)]. Further analyses suggested...... that the differences between pre-eclamptic cases and controls primarily were accomplished by a different transmission from the father of a 14 bp deletion/insertion polymorphism in exon 8 (P = 0.006, Fisher's exact test), which previously has been linked to differences in the levels of HLA-G expression and in HLA-G m...

  7. Expression of HLA Class I and HLA Class II by Tumor Cells in Chinese Classical Hodgkin Lymphoma Patients

    NARCIS (Netherlands)

    Huang, Xin; van den Berg, Anke; Gao, Zifen; Visser, Lydia; Nolte, Ilja; Vos, Hans; Hepkema, Bouke; Kooistra, Wierd; Poppema, Sibrand; Diepstra, Arjan

    2010-01-01

    Background: In Caucasian populations, the tumor cells of Epstein Barr virus (EBV)-positive classical Hodgkin Lymphomas (cHL) patients more frequently express HLA class I and HLA class II molecules compared to EBV-negative cHL patients. HLA expression (in relation to EBV) in Asian cHL patients has no

  8. Protective human leucocyte antigen haplotype, HLA-DRB1*01-B*14, against chronic Chagas disease in Bolivia.

    Directory of Open Access Journals (Sweden)

    Florencia del Puerto

    Full Text Available BACKGROUND: Chagas disease, caused by the flagellate parasite Trypanosoma cruzi affects 8-10 million people in Latin America. The mechanisms that underlie the development of complications of chronic Chagas disease, characterized primarily by pathology of the heart and digestive system, are not currently understood. To identify possible host genetic factors that may influence the clinical course of Chagas disease, Human Leucocyte Antigen (HLA regional gene polymorphism was analyzed in patients presenting with differing clinical symptoms. METHODOLOGY: Two hundred and twenty nine chronic Chagas disease patients in Santa Cruz, Bolivia, were examined by serological tests, electrocardiogram (ECG, and Barium enema colon X-ray. 31.4% of the examinees showed ECG alterations, 15.7% megacolon and 58.1% showed neither of them. A further 62 seropositive megacolon patients who had undergone colonectomy due to acute abdomen were recruited. We analyzed their HLA genetic polymorphisms (HLA-A, HLA-B, MICA, MICB, DRB1 and TNF-alpha promoter region mainly through Sequence based and LABType SSO typing test using LUMINEX Technology. PRINCIPAL FINDINGS: The frequencies of HLA-DRB1*01 and HLA-B*14:02 were significantly lower in patients suffering from megacolon as well as in those with ECG alteration and/or megacolon compared with a group of patients with indeterminate symptoms. The DRB1*0102, B*1402 and MICA*011 alleles were in strong Linkage Disequilibrium (LD, and the HLA-DRB1*01-B*14-MICA*011 haplotype was associated with resistance against chronic Chagas disease. CONCLUSIONS: This is the first report of HLA haplotype association with resistance to chronic Chagas disease.

  9. Protective human leucocyte antigen haplotype, HLA-DRB1*01-B*14, against chronic Chagas disease in Bolivia.

    Directory of Open Access Journals (Sweden)

    Florencia del Puerto

    Full Text Available BACKGROUND: Chagas disease, caused by the flagellate parasite Trypanosoma cruzi affects 8-10 million people in Latin America. The mechanisms that underlie the development of complications of chronic Chagas disease, characterized primarily by pathology of the heart and digestive system, are not currently understood. To identify possible host genetic factors that may influence the clinical course of Chagas disease, Human Leucocyte Antigen (HLA regional gene polymorphism was analyzed in patients presenting with differing clinical symptoms. METHODOLOGY: Two hundred and twenty nine chronic Chagas disease patients in Santa Cruz, Bolivia, were examined by serological tests, electrocardiogram (ECG, and Barium enema colon X-ray. 31.4% of the examinees showed ECG alterations, 15.7% megacolon and 58.1% showed neither of them. A further 62 seropositive megacolon patients who had undergone colonectomy due to acute abdomen were recruited. We analyzed their HLA genetic polymorphisms (HLA-A, HLA-B, MICA, MICB, DRB1 and TNF-alpha promoter region mainly through Sequence based and LABType SSO typing test using LUMINEX Technology. PRINCIPAL FINDINGS: The frequencies of HLA-DRB1*01 and HLA-B*14:02 were significantly lower in patients suffering from megacolon as well as in those with ECG alteration and/or megacolon compared with a group of patients with indeterminate symptoms. The DRB1*0102, B*1402 and MICA*011 alleles were in strong Linkage Disequilibrium (LD, and the HLA-DRB1*01-B*14-MICA*011 haplotype was associated with resistance against chronic Chagas disease. CONCLUSIONS: This is the first report of HLA haplotype association with resistance to chronic Chagas disease.

  10. HLA-B8 association with late-stage melanoma – an immunological lesson?

    Directory of Open Access Journals (Sweden)

    Andersen Mads

    2006-03-01

    Full Text Available Abstract Background Differences in HLA allele frequencies between the diseased and healthy populations may signify efficient immune responses, a notion that has been successfully tested for infectious diseases or for association with genetic elements involved in a distinct type of immunity. This retrospective study is intended to detect differences in MHC class I carrier frequencies of advanced melanoma patients compared to healthy bone marrow donors. Methods The HLA-A and -B carrier frequencies of 748 stage IV melanoma patients retrieved from serotyping at 6 different centers in Germany were compared using a chi-square test to 13,386 fully HLA typed bone marrow donors registered in the German national bone marrow donor registry. Results The comparison of HLA carrier frequencies in advanced cancer patients with healthy bone marrow donors revealed a significant decrease in HLA-B8 carrier frequencies, which was also apparent in patients with advanced disease compared to patients with loco-regional disease. Conclusion The data suggest that protective immune responses restricted to distinct MHC class I molecules may be operational in a subset of melanoma patients, which is the prerequisite for a large scale screen for the corresponding epitopes. Alternatively, the known association of the ancestral haplotype HLA-A1, -B8 and -DR3 with genetic elements such as distinct TNF-α alleles might have a protective effect on disease progression. In any case, identification of the cause of protection within this patient subset might lead to a significant improvement in the efficacy of current immunotherapeutic approaches.

  11. Frequencies of allele groups HLA-A, HLA-B and HLA-DRB1 in a population from the northwestern region of São Paulo State, Brazil.

    Science.gov (United States)

    Ayo, C M; da Silveira Camargo, A V; Xavier, D H; Batista, M F; Carneiro, O A; Brandão de Mattos, C C; Ricci, O; de Mattos, L C

    2015-02-01

    The aim of this study was to estimate the HLA-A, HLA-B and HLA-DRB1 allele groups frequencies in a population of 1559 volunteer bone marrow donors from the northwestern region of São Paulo State grouped according to ethnicity. An additional objective was to compare the allele frequencies of the current study with data published for other Brazilian populations. The allele groups were characterized by the PCR-rSSO method using Luminex(®) technology. Twenty HLA-A, 32 HLA-B and 13 HLA-DRB1 allele groups were identified. The most common allele groups in European descent and mixed African and European descent samples were HLA-A*02, HLA-B*35 and HLA-DRB1*13, while HLA-A*02, HLA-B*35 and HLA-DRB1*11 were more common in African descent samples. The HLA-A*23, HLA-A*36, HLA-B*58 and HLA-B*81 allele groups were more common in sample from African descent than European descent, and the HLA-DRB1*08 was more common in mixed African and European descent than in European descent. Allele group frequencies were compared with samples from other Brazilian regions. The HLA-A*30 and HLA-A*23 were more common in this study than in the populations of Rio Grande do Sul and Paraná; and the HLA-A*01, HLA-B*18, HLA-B*57 and HLA-DRB1*11 were more common in this study than in the population of Piauí. The least frequent allele groups were HLA-A*31, HLA-B*15, HLA-B*40 and HLA-DRB1*08 for the population of Piauí, HLA-A*01 and HLA-A*11 for Parana, HLA-A*02 and -A*03 for Rio Grande do Sul and HLA-DRB1*04 for Paraná, Rio Grande do Sul and Piauí. These data provide an overview on the knowledge on HLA diversity in the population of the northwestern region of São Paulo State and show that the genes of this system are useful to distinguish different ethnic groups.

  12. Human leukocyte antigen (HLA)-G during pregnancy part I

    DEFF Research Database (Denmark)

    Klitkou, Louise; Dahl, Mette; Hviid, Thomas Vauvert F;

    2015-01-01

    HLA-G levels are significantly lower in fetal compared with maternal blood at term documents for the first time that sHLA-G is not freely transferred over the placental barrier. Soluble HLA-G levels in maternal and fetal blood were found to be correlated, which may be due to shared genetic factors...... of importance for production of sHLA-G in the mother and child, or it may support the theory that sHLA-G in the pregnant woman and the fetus is partly derived from a "shared organ", the placenta....

  13. Human thymic epithelial cells express functional HLA-DP molecules

    DEFF Research Database (Denmark)

    Jørgensen, A; Röpke, C; Nielsen, M

    1996-01-01

    T lymphocytes, we examined whether human thymic epithelial cells (TEC) expressed HLA-DP molecules. We present evidence that TEC obtained from short time culture express low but significant levels of HLA-DP molecules. The expression of HLA-DP molecules was comparable to or higher than the expression...... of HLA-DP allospecific primed lymphocyte typing (PLT) CD4 T cell lines. IFN-gamma treatment strongly upregulated the HLA-DP allospecific PLT responses whereas other PLT responses remained largely unchanged. In conclusion, these data indicate that human thymus epithelial cells express significant levels...

  14. Adjuvanted multi-epitope vaccines protect HLA-A*1101 transgenic mice against Toxoplasma gondii

    Science.gov (United States)

    We created and tested multi-epitope DNA or protein vaccines with TLR4 ligand emulsion adjuvant (gluco glucopyranosyl lipid adjuvant in a stable emulsion (GLA-SE)) for their ability to protect against Toxoplasma gondii in HLA transgenic mice. Our constructs each included five of our best down selecte...

  15. Developmental neuropsychological assessment of 4- to 5-year-old children born following Preimplantation Genetic Diagnosis (PGD): A pilot study.

    Science.gov (United States)

    Sacks, Gilat Chaya; Altarescu, Gheona; Guedalia, Judith; Varshaver, Irit; Gilboa, Tal; Levy-Lahad, Ephrat; Eldar-Geva, Talia

    2016-01-01

    The purpose of this pilot study was to evaluate developmental neuropsychological profiles of 4- to 5-year-old children born after Preimplantation Genetic Diagnosis (PGD). Twenty-seven participants received a neurological examination and a battery of neuropsychological assessments including Wechsler Preschool & Primary Scale of Intelligence - Third Edition (WPPSI-III; cognitive development), Preschool Language Scale, Fourth Edition (PLS-4; language development), Wide Range Assessment of Visual Motor Abilities (visual motor abilities), Childhood Autism Rating Scales II (a screening test for autistic spectrum disorders), and the Miles ABC Test (ocular dominance). Parental questionnaires included the Behavior Rating Inventory of Executive Function Preschool Version (BRIEF-P; executive function), Child Behavior Checklist (CBCL) and the Carey Temperament Scales Behavioral Style Questionnaire (socioemotional development and temperament), and the Vineland Adaptive Behavior Scales, Interview Edition, Second Edition (general adaptive behavior). Subjects' tests results were compared to each test's norms. Children born after PGD demonstrated scores within the normal or above-normal ranges for all developmental outcomes (mean ± SD): WPPSI-III-VIQ 107.4 ± 14.4 (p = .013), PLS-4-Total 113.2 ± 12.4, p family history of autism was noted. In conclusion, in this pilot study, children assessed at age 4-5 years and conceived after PGD displayed developmental neuropsychological outcomes within normal limits as compared to their chronologic peers. A larger study is needed to evaluate and follow the neuropsychological development of children born after PGD.

  16. Mouse preimplantation embryo responses to culture medium osmolarity include increased expression of CCM2 and p38 MAPK activation

    Directory of Open Access Journals (Sweden)

    Watson Andrew J

    2007-01-01

    Full Text Available Abstract Background Mechanisms that confer an ability to respond positively to environmental osmolarity are fundamental to ensuring embryo survival during the preimplantation period. Activation of p38 mitogen-activated protein kinase (MAPK occurs following exposure to hyperosmotic treatment. Recently, a novel scaffolding protein called Osmosensing Scaffold for MEKK3 (OSM was linked to p38 MAPK activation in response to sorbitol-induced hypertonicity. The human ortholog of OSM is cerebral cavernous malformation 2 (CCM2. The present study was conducted to investigate whether CCM2 is expressed during mouse preimplantation development and to determine whether this scaffolding protein is associated with p38 MAPK activation following exposure of preimplantation embryos to hyperosmotic environments. Results Our results indicate that Ccm2 along with upstream p38 MAPK pathway constituents (Map3k3, Map2k3, Map2k6, and Map2k4 are expressed throughout mouse preimplantation development. CCM2, MAP3K3 and the phosphorylated forms of MAP2K3/MAP2K6 and MAP2K4 were also detected throughout preimplantation development. Embryo culture in hyperosmotic media increased p38 MAPK activity in conjunction with elevated CCM2 levels. Conclusion These results define the expression of upstream activators of p38 MAPK during preimplantation development and indicate that embryo responses to hyperosmotic environments include elevation of CCM2 and activation of p38 MAPK.

  17. Circulating preproinsulin signal peptide-specific CD8 T cells restricted by the susceptibility molecule HLA-A24 are expanded at onset of type 1 diabetes and kill β-cells.

    Science.gov (United States)

    Kronenberg, Deborah; Knight, Robin R; Estorninho, Megan; Ellis, Richard J; Kester, Michel G; de Ru, Arnoud; Eichmann, Martin; Huang, Guo C; Powrie, Jake; Dayan, Colin M; Skowera, Ania; van Veelen, Peter A; Peakman, Mark

    2012-07-01

    Type 1 diabetes results from T cell-mediated β-cell destruction. The HLA-A*24 class I gene confers significant risk of disease and early onset. We tested the hypothesis that HLA-A24 molecules on islet cells present preproinsulin (PPI) peptide epitopes to CD8 cytotoxic T cells (CTLs). Surrogate β-cell lines secreting proinsulin and expressing HLA-A24 were generated and their peptide ligandome examined by mass spectrometry to discover naturally processed and HLA-A24-presented PPI epitopes. A novel PPI epitope was identified and used to generate HLA-A24 tetramers and examine the frequency of PPI-specific T cells in new-onset HLA-A*24(+) patients and control subjects. We identified a novel naturally processed and HLA-A24-presented PPI signal peptide epitope (PPI(3-11); LWMRLLPLL). HLA-A24 tetramer analysis reveals a significant expansion of PPI(3-11)-specific CD8 T cells in the blood of HLA-A*24(+) recent-onset patients compared with HLA-matched control subjects. Moreover, a patient-derived PPI(3-11)-specific CD8 T-cell clone shows a proinflammatory phenotype and kills surrogate β-cells and human HLA-A*24(+) islet cells in vitro. These results indicate that the type 1 diabetes susceptibility molecule HLA-A24 presents a naturally processed PPI signal peptide epitope. PPI-specific, HLA-A24-restricted CD8 T cells are expanded in patients with recent-onset disease. Human islet cells process and present PPI(3-11), rendering themselves targets for CTL-mediated killing.

  18. Human lymphocyte antigens (HLA) and Graves' disease in Turkey.

    Science.gov (United States)

    Orhan, Y; Azezli, A; Carin, M; Aral, F; Sencer, E; Molvalilar, S

    1993-09-01

    To evaluate the association of HLA types with Turkish patients with Graves' disease, HLA typing, clinical findings, and thyroid antibodies were correlated. The HLA types, clinical findings (ophthalmopathy and age at onset), and thyroid stimulating hormone (TSH) receptor (TRAb) and antithyroid microsomal antibodies (MAb) were analyzed. Seventy Turkish patients with Graves' disease and 306 control subjects were assessed. Serological HLA typing was performed in HLA A, B, C, DR, and DQ loci. There was a significantly increased prevalence of HLA B8, B49, DR3, DR4, and DR10 in Graves' disease. The association of Graves' disease with HLA DR3 was found to be less strong than previously described. The HLA DR4 antigen may contribute to the predisposition of Graves' disease in Turkey. The results suggest that HLA B7, B13, DR7, DQw2, and DQw3 may confer a protective effect for Graves' disease in Turkey. Patients carrying HLA B12, B18, and B44 haplotypes had a tendency to develop the disease at a later age. The difference from the other studies may be the result of the selection of the controls; in part, of the variability in serological typing reagents; and, also, of the rather weak HLA associations with the disease.

  19. The structure of HLA-DR52c: Comparison to other HLA-DRB3 alleles

    Energy Technology Data Exchange (ETDEWEB)

    Dai, Shaodong; Crawford, Frances; Marrack, Philippa; Kappler, John W. (HHMI)

    2008-09-05

    Class II major histocompatibility complex (MHCII) molecules present antigens to CD4{sup +} T cells. In addition to the most commonly studied human MHCII isotype, HLA-DR, whose {beta} chain is encoded by the HLA-DRB1 locus, several other isotypes that use the same {alpha} chain but have {beta} chains encoded by other genes. These other DR molecules also are expressed in antigen-presenting cells and are known to participate in peptide presentation to T cells and to be recognized as alloantigens by other T cells. Like some of the HLA-DRB1 alleles, several of these alternate DR molecules have been associated with specific autoimmune diseases and T cell hypersensitivity. Here we present the structure of an HLA-DR molecule (DR52c) containing one of these alternate {beta} chains (HLA-DRB3*0301) bound to a self-peptide derived from the Tu elongation factor. The molecule shares structurally conserved elements with other MHC class II molecules but has some unique features in the peptide-binding groove. Comparison of the three major HLA-DBR3 alleles (DR52a, b, and c) suggests that they were derived from one another by recombination events that scrambled the four major peptide-binding pockets at peptide positions 1, 4, 6, and 9 but left virtually no polymorphisms elsewhere in the molecules.

  20. HLA typing in acute optic neuritis

    DEFF Research Database (Denmark)

    Frederiksen, J L; Madsen, H O; Ryder, L P

    1997-01-01

    OBJECTIVE: To study the association of brain magnetic resonance imaging (MRI) findings and HLA findings to clarify the relationship between monosymptomatic optic neuritis (ON) and ON as part of clinically definite multiple sclerosis (CDMS). DESIGN: Population-based cohort of patients with ON refe...

  1. 风湿性心脏炎HLA-DR分子表达量的改变%The relationship between rheumatic carditis and the expression of HLA-DR

    Institute of Scientific and Technical Information of China (English)

    张韶冈; 古洁若; 余步云; 张汉伟

    2001-01-01

    Objective To investigate the effect of the expression of HLA-DR on the surface of lymphocytes of peripheral blood in the etiology of rheumatic carditis and find out the new way for diagnosis and treatment of rheumatic carditis. Methods 33 cases with rheumatic carditis (RC), 21 cases with arthritis, 36 cases of inactive rheumatic heart disease (RHD) and 16 cases of post-streptococcal infection were selected from out-patients and in-patients. 43 healthy subjects were used as control groups. Lymphocytes that were isolated from the peripheral blood of the cases groups were stimulated by membrane antigen of A group β type of hemolytic streptococcus and GM-CSF, and left blank control without any stimulates. The expression of HLA-DR on the surfaces of the lymphocytes were examinated with the ameliorated cell-ELISA method of Ranall Ellis Morris. Analysis   of variance was used for analyzing.Results ①The level of the expression of HLA-DR in the rheumatic carditis was significantly higher than the other groups (P<0.05), and the expression level in the arthritis group was also significantly higher than that in the inactive RHD group and post-streptococcal group (P<0.05).②The expression level of HLA-DR of all the cases groups increased after adding membrane antigen or GM-CSF. After stimulated by membrane antigen, the increasing of HLA-DR expression level in rheumatic carditis group was significantly higher than the other groups. The increasing levels of HLA-DR expression in arthritis group was also higher than that of inactive rheumatic heart disease group and post-streptococcal infection group or control group (P<0.05). After stimulated with GM-CSF, the increasing levels of HLA-DR expression among all groups were without significant difference (P>0.05). Conclusion ①Testing the expression level of HLA-DR is helpful for diagnosing and monitoring the states of rheumatic fever. ②Both membrane antigen and HLA-DR had important effects on the onset and

  2. Skin Cancer Risk Is Modified by KIR/HLA Interactions That Influence the Activation of Natural Killer Immune Cells.

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    Vineretsky, Karin A; Karagas, Margaret R; Christensen, Brock C; Kuriger-Laber, Jacquelyn K; Perry, Ann E; Storm, Craig A; Nelson, Heather H

    2016-01-15

    Natural killer (NK)-cell phenotype is partially mediated through binding of killer-cell immunoglobulin-like receptors (KIR) with HLA class I ligands. The KIR gene family is highly polymorphic and not well captured by standard genome-wide association study approaches. Here, we tested the hypothesis that variations in KIR gene content combined with HLA class I ligand status is associated with keratinocyte skin cancers using a population-based study of basal cell carcinoma (BCC) and squamous cell carcinomas (SCC). We conducted an interaction analysis of KIR gene content variation and HLA-B (Bw4 vs. Bw6) and HLA-C (C1 vs. C2). KIR centromeric B haplotype was associated with significant risk of multiple BCC tumors (OR, 2.39; 95% confidence interval, 1.10-5.21), and there was a significant interaction between HLA-C and the activating gene KIR2DS3 for BCC (Pinteraction = 0.005). Furthermore, there was significant interaction between HLA-B and telomeric KIR B haplotype (containing the activating genes KIR3DS1 and KIR2DS1) as well as HLA-B and the activating KIR gene KIR2DS5 (Pinteraction 0.001 and 0.012, respectively). Similar but greatly attenuated associations were observed for SCC. Moreover, previous in vitro models demonstrated that p53 is required for upregulation of NK ligands, and accordingly, we observed there was a strong association between the KIR B haplotype and p53 alteration in BCC tumors, with a higher likelihood that KIR B carriers harbor abnormal p53 (P KIR and HLA modify risks of BCC and SCC and that KIR encoded by the B genes provides selective pressure for altered p53 in BCC tumors.

  3. Serum antibodies to human leucocyte antigen (HLA)-E, HLA-F and HLA-G in patients with systemic lupus erythematosus (SLE) during disease flares: Clinical relevance of HLA-F autoantibodies.

    Science.gov (United States)

    Jucaud, V; Ravindranath, M H; Terasaki, P I; Morales-Buenrostro, L E; Hiepe, F; Rose, T; Biesen, R

    2016-03-01

    T lymphocyte hyperactivity and progressive inflammation in systemic lupus erythematosus (SLE) patients results in over-expression of human leucocyte antigen (HLA)-Ib on the surface of lymphocytes. These are shed into the circulation upon inflammation, and may augment production of antibodies promoting pathogenicity of the disease. The objective was to evaluate the association of HLA-Ib (HLA-E, HLA-F and HLA-G) antibodies to the disease activity of SLE. The immunoglobulin (Ig)G/IgM reactivity to HLA-Ib and β2m in the sera of 69 German, 29 Mexican female SLE patients and 17 German female controls was measured by multiplex Luminex(®)-based flow cytometry. The values were expressed as mean flourescence intensity (MFI). Only the German SLE cohort was analysed in relation to the clinical disease activity. In the controls, anti-HLA-G IgG predominated over other HLA-Ib antibodies, whereas SLE patients had a preponderance of anti-HLA-F IgG over the other HLA-Ib antibodies. The disease activity index, Systemic Lupus Erythematosus Disease Activity Index (SLEDAI)-2000, was reflected only in the levels of anti-HLA-F IgG. Anti-HLA-F IgG with MFI level of 500-1999 was associated with active SLE, whereas inactive SLE revealed higher MFI (>2000). When anti-HLA-F IgG were cross-reactive with other HLA-Ib alleles, their reactivity was reflected in the levels of anti-HLA-E and -G IgG. The prevalence of HLA-F-monospecific antibodies in SLE patients was also associated with the clinical disease activity. Anti-HLA-F IgG is possibly involved in the clearance of HLA-F shed from lymphocytes and inflamed tissues to lessen the disease's severity, and thus emerges as a beneficial immune biomarker. Therefore, anti-HLA-Ib IgG should be considered as a biomarker in standard SLE diagnostics.

  4. Maternal anti-HLA class I antibodies are associated with reduced birth weight in thrombocytopenic neonates.

    Science.gov (United States)

    Dahl, J; Husebekk, A; Acharya, G; Flo, K; Stuge, T B; Skogen, B; Straume, B; Tiller, H

    2016-02-01

    In this comparative cross-sectional study, possible associations between maternal anti-HLA class I antibodies and birth weight in neonatal thrombocytopenia are explored. Although commonly detected in pregnancies and generally regarded as harmless, it has been suggested that such antibodies might be associated with fetal and neonatal alloimmune thrombocytopenia (FNAIT). As a link between FNAIT due to human platelet antigen 1a-specific antibodies and reduced birth weight in boys has previously been demonstrated, we wanted to explore whether maternal anti-HLA class I antibodies might also affect birth weight. To examine this, suspected cases of FNAIT referred to the Norwegian National Unit for Platelet Immunology during the period 1998-2009 were identified. Pregnancies where the only finding was maternal anti-HLA class I antibodies were included. An unselected group of pregnant women participating in a prospective study investigating maternal-fetal hemodynamics at the University Hospital North Norway during the years 2006-2010 served as controls. Twenty-nine percent of controls had anti-HLA class I antibodies. The thrombocytopenic neonates had a significantly lower adjusted birth weight (linear regression, P=0.036) and significantly higher odds of being small for gestational age (OR=6.72, P<0.001) compared with controls. Increasing anti-HLA class I antibody levels in the mother were significantly associated with lower birth weight and placental weight among thrombocytopenic neonates, but not among controls. These results indicate that maternal anti-HLA class I antibodies in thrombocytopenic neonates are associated with reduced fetal growth. Further studies are needed to test if placental function is affected.

  5. Rapid Mitochondrial DNA Segregation in Primate Preimplantation Embryos Precedes Somatic and Germline Bottleneck

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    Hyo-Sang Lee

    2012-05-01

    Full Text Available The timing and mechanisms of mitochondrial DNA (mtDNA segregation and transmission in mammals are poorly understood. Genetic bottleneck in female germ cells has been proposed as the main phenomenon responsible for rapid intergenerational segregation of heteroplasmic mtDNA. We demonstrate here that mtDNA segregation occurs during primate preimplantation embryogenesis resulting in partitioning of mtDNA variants between daughter blastomeres. A substantial shift toward homoplasmy occurred in fetuses and embryonic stem cells (ESCs derived from these heteroplasmic embryos. We also observed a wide range of heteroplasmic mtDNA variants distributed in individual oocytes recovered from these fetuses. Thus, we present here evidence for a previously unknown mtDNA segregation and bottleneck during preimplantation embryo development, suggesting that return to the homoplasmic condition can occur during development of an individual organism from the zygote to birth, without a passage through the germline.

  6. Rapid mitochondrial DNA segregation in primate preimplantation embryos precedes somatic and germline bottleneck.

    Science.gov (United States)

    Lee, Hyo-Sang; Ma, Hong; Juanes, Rita Cervera; Tachibana, Masahito; Sparman, Michelle; Woodward, Joy; Ramsey, Cathy; Xu, Jing; Kang, Eun-Ju; Amato, Paula; Mair, Georg; Steinborn, Ralf; Mitalipov, Shoukhrat

    2012-05-31

    The timing and mechanisms of mitochondrial DNA (mtDNA) segregation and transmission in mammals are poorly understood. Genetic bottleneck in female germ cells has been proposed as the main phenomenon responsible for rapid intergenerational segregation of heteroplasmic mtDNA. We demonstrate here that mtDNA segregation occurs during primate preimplantation embryogenesis resulting in partitioning of mtDNA variants between daughter blastomeres. A substantial shift toward homoplasmy occurred in fetuses and embryonic stem cells (ESCs) derived from these heteroplasmic embryos. We also observed a wide range of heteroplasmic mtDNA variants distributed in individual oocytes recovered from these fetuses. Thus, we present here evidence for a previously unknown mtDNA segregation and bottleneck during preimplantation embryo development, suggesting that return to the homoplasmic condition can occur during development of an individual organism from the zygote to birth, without a passage through the germline.

  7. Reactive oxygen species-mediated unfolded protein response pathways in preimplantation embryos

    Science.gov (United States)

    Ali, Ihsan; Shah, Syed Zahid Ali; Jin, Yi; Li, Zhong-Shu; Ullah, Obaid

    2017-01-01

    Excessive production of reactive oxygen species (ROS) and endoplasmic reticulum (ER) stress-mediated responses are critical to embryonic development in the challenging in vitro environment. ROS production increases during early embryonic development with the increase in protein requirements for cell survival and growth. The ER is a multifunctional cellular organelle responsible for protein folding, modification, and cellular homeostasis. ER stress is activated by a variety of factors including ROS. Such stress leads to activation of the adaptive unfolded protein response (UPR), which restores homeostasis. However, chronic stress can exceed the toleration level of the ER, resulting in cellular apoptosis. In this review, we briefly describe the generation and impact of ROS in preimplantation embryo development, the ROS-mediated activation mechanism of the UPR via the ER, and the subsequent activation of signaling pathways following ER stress in preimplantation embryos. PMID:28057903

  8. Quantitative Trait Locus and Brain Expression of HLA-DPA1 Offers Evidence of Shared Immune Alterations in Psychiatric Disorders

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    Ling Z. Morgan

    2016-03-01

    Full Text Available Genome-wide association studies of schizophrenia encompassing the major histocompatibility locus (MHC were highly significant following genome-wide correction. This broad region implicates many genes including the MHC complex class II. Within this interval we examined the expression of two MHC II genes (HLA-DPA1 and HLA-DRB1 in brain from individual subjects with schizophrenia (SZ, bipolar disorder (BD, major depressive disorder (MDD, and controls by differential gene expression methods. A third MHC II mRNA, CD74, was studied outside of the MHC II locus, as it interacts within the same immune complex. Exon microarrays were performed in anterior cingulate cortex (ACC in BD compared to controls, and both HLA-DPA1 and CD74 were decreased in expression in BD. The expression of HLA-DPA1 and CD74 were both reduced in hippocampus, amygdala, and dorsolateral prefrontal cortex regions in SZ and BD compared to controls by specific qPCR assay. We found several novel HLA-DPA1 mRNA variants spanning HLA-DPA1 exons 2-3-4 as suggested by exon microarrays. The intronic rs9277341 SNP was a significant cis expression quantitative trait locus (eQTL that was associated with the total expression of HLA-DPA1 in five brain regions. A biomarker study of MHC II mRNAs was conducted in SZ, BD, MDD, and control lymphoblastic cell lines (LCL by qPCR assay of 87 subjects. There was significantly decreased expression of HLA-DPA1 and CD74 in BD, and trends for reductions in SZ in LCLs. The discovery of multiple splicing variants in brain for HLA-DPA1 is important as the HLA-DPA1 gene is highly conserved, there are no reported splicing variants, and the functions in brain are unknown. Future work on the function and localization of MHC Class II proteins in brain will help to understand the role of alterations in neuropsychiatric disorders. The HLA-DPA1 eQTL is located within a large linkage disequilibrium block that has an irrefutable association with schizophrenia. Future

  9. HLA-G and classical HLA class I expression in primary colorectal cancer and associated liver metastases.

    Science.gov (United States)

    Swets, Marloes; König, Marion H; Zaalberg, Anniek; Dekker-Ensink, Neeltje G; Gelderblom, Hans; van de Velde, Cornelis J H; van den Elsen, Peter J; Kuppen, Peter J K

    2016-09-01

    De novo expression of HLA-G has been demonstrated in colorectal cancer. HLA-G, amongst others, inhibits natural killer cell function, contributing to host immune defense evasion. Another mechanism to escape anti-tumor immunity is loss of HLA class I. Therefore, we determined HLA-G and HLA class I expression on primary colorectal tumors and associated liver metastases, in order to get insight in the metastasizing process regarding escaping anti-tumor immunity. HLA-G expression was evaluated using three mAbs; 4H84, MEM-G/1 and MEM-G/2. In total 81 colorectal cancer patients were evaluated. Formalin-fixed paraffin-embedded tissue sections of primary tumors and associated liver metastases, were immunohistochemically stained. A concordance between expression or loss/downregulation in the primary tumor and associated liver metastasis regarding HLA class I expression was observed in 80% of the cases. In contrast with the hypothesis of escaping NK cell-killing, we demonstrated for each HLA-G detecting mAbs used in this study, that the majority of the primary tumors that positively stained for HLA-G did not express HLA-G in the associated liver metastasis. Furthermore, we revealed the existence of non-specific binding and in addition we found that the different epitopes of HLA-G detected by 4H84, MEM-G/1 and MEM-G/2 mAbs were expressed differentially in colorectal tumor tissues.

  10. Effects of American Ginseng on Preimplantation Development and Pregnancy in Mice.

    Science.gov (United States)

    Belanger, Danyka; Calder, Michele D; Gianetto-Berruti, Alessandra; Lui, Edmund M; Watson, Andrew J; Feyles, Valter

    2016-01-01

    In North America, a high proportion of pregnant women use herbal medications including North American ginseng. This medicinal plant contains high amounts of triterpene saponins (ginsenosides), which are the main bioactive compounds. It is important to assess ginseng's impact on all reproductive functions to ensure the safety of pregnant women and fetuses. In this study, we defined the concentration-responsive effects of North American alcoholic and aqueous ginseng extracts on preimplantation development in vitro and on pregnancy and post-partum development in the mouse. Two-cell mouse embryos were cultured with 5 different concentrations of whole ginseng root extracts, or ginsenosides Rb1, Rg1 and Re alone, a combinatorial ginsenoside solution and a crude polysaccharide fraction solution. Embryonic development and recovery from each treatment was assessed. To investigate the in vivo effects of ginseng extracts, female mice were gavaged with 50[Formula: see text]mg/kg/day, 500[Formula: see text]mg/kg/day or 2000[Formula: see text]mg/kg/day of either extract (treatment) or water (sham) for 2 weeks prior to mating and throughout gestation. Gestation period, litter size, pup growth and pup sex ratio were evaluated. Oral ginseng consumption did not significantly affect fertility or pregnancy in the mouse. High doses of ginseng (2000[Formula: see text]mg/kg/day) decreased maternal weight gain. Direct treatment of preimplantation embryos in vitro demonstrated that ALC and AQ extract treatment reduced development in a concentration responsive manner, while only ALC extract effects were largely reversible. Treatments with individual or combinatorial ginsenosides, or the polysaccharide fraction solution alone did not impair preimplantation development, in vitro. In conclusion, maternal oral consumption of ginseng has little negative impact on pregnancy in the mouse, however, direct exposure to ginseng extract during mouse preimplantation development in vitro is detrimental.

  11. Nasopharyngeal Carcinoma (NPC Related Human Leukocyte Antigen (HLA Haplotype Sharing among Southern East Asian Population

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    Rika Yuliwulandari

    2017-02-01

    Full Text Available Abstract The human leukocyte antigens (HLAs play important roles in the immune systems to response to various pathogens and disease among individuals. The aim of this study was analyze the HLA allele and haplotype frequencies of Southern East Asian population that show high incidence of nasopharyngeal carcinoma (NPC to evaluate the shared HLA haplotype contribution to NPC susceptibility among the population and analyses the genetic affinities between the population. We collect information of HLA haplotype from our previous study, other published paper, and HLA database in 19 population during 2005 to 2015. Haplotype frequencies were estimated using the maximum likelihood method based on an expectation maximization algorithm with ARLEQUIN v.2.0 software. We also calculated the genetic distance among 19 Southern East Asians based on HLA allele frequency using modified Cavalli-Sforza (DA distance method. Then, a phylogenetic tree was constructed using DISPAN software and principal component analysis (PCA was performed using XLSTAT-PRO software. A33-B58-DR3 haplotype, tightly linked to NPC, was commonly observed in all populations, supporting the high incidence of NPC in the populations. In addition, A2-B46 haplotype also associated with NPC, was also commonly found in several population that may also have a role in the disease development. The conclusion is the HLA haplotype sharing has an important role than the HLA allele sharing. The A33-B58-DR3 haplotype and A2-B46-DR9 haplotype in this study could be related to NPC in the Southern East Asian populations. The observed haplotype needs to be tested in the real patients to confirm the assumption. Abstrak Human leukocyte antigens (HLAs berperan penting dalam sistem imun untuk merespons berbagai patogen dan penyakit di antara individu yang berbeda. Tujuan penelitian ini menganalisis frekuensi alel dan haplotipe HLA populasi Southern East Asia yang menunjukkan insidensi yang tinggi terhadap

  12. PreImplantation Factor (PIF correlates with early mammalian embryo development-bovine and murine models

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    Coulam Carolyn B

    2011-05-01

    Full Text Available Abstract Background PreImplantation Factor (PIF, a novel peptide secreted by viable embryos is essential for pregnancy: PIF modulates local immunity, promotes decidual pro-adhesion molecules and enhances trophoblast invasion. To determine the role of PIF in post-fertilization embryo development, we measured the peptide's concentration in the culture medium and tested endogenous PIF's potential trophic effects and direct interaction with the embryo. Methods Determine PIF levels in culture medium of multiple mouse and single bovine embryos cultured up to the blastocyst stage using PIF-ELISA. Examine the inhibitory effects of anti-PIF-monoclonal antibody (mAb added to medium on cultured mouse embryos development. Test FITC-PIF uptake by cultured bovine blastocysts using fluorescent microscopy. Results PIF levels in mouse embryo culture medium significantly increased from the morula to the blastocyst stage (ANOVA, P = 0.01. In contrast, atretic embryos medium was similar to the medium only control. Detectable - though low - PIF levels were secreted already by 2-cell stage mouse embryos. In single bovine IVF-derived embryos, PIF levels in medium at day 3 of culture were higher than non-cleaving embryos (control (P = 0.01 and at day 7 were higher than day 3 (P = 0.03. In non-cleaving embryos culture medium was similar to medium alone (control. Anti-PIF-mAb added to mouse embryo cultures lowered blastocyst formation rate 3-fold in a dose-dependent manner (2-way contingency table, multiple groups, X2; P = 0.01 as compared with non-specific mouse mAb, and medium alone, control. FITC-PIF was taken-up by cultured bovine blastocysts, but not by scrambled FITC-PIF (control. Conclusions PIF is an early embryo viability marker that has a direct supportive role on embryo development in culture. PIF-ELISA use to assess IVF embryo quality prior to transfer is warranted. Overall, our data supports PIF's endogenous self sustaining role in embryo development and the

  13. CFTR mediates bicarbonate-dependent activation of miR-125b in preimplantation embryo development

    Institute of Scientific and Technical Information of China (English)

    Yong Chao Lu; Alvin Chun Hang Ma; Anskar Yu Hung Leung; He Feng Huang; Hsiao Chang Chan; Hui Chen; Kin Lam Fok; Lai Ling Tsang; Mei Kuen Yu; Xiao Hu Zhang; Jing Chen; Xiaohua Jiang; Yiu Wa Chung

    2012-01-01

    Although HCO3-is known to be required for early embryo development,its exact role remains elusive.Here we report that HCO3-acts as an environmental cue in regulating miR-125b expression through CFTR-mediated influx during preimplantation embryo development.The results show that the effect of HCO3-on preimplantation embryo development can be suppressed by interfering the function of a HCO3--conducting channel,CFTR,by a specific inhibitor or gene knockout.Removal of extracellular HCO3-or inhibition of CFTR reduces miR-125b expression in 2 cell-stage mouse embryos.Knockdown of miR-125b mimics the effect of HCO3-removal and CFTR inhibition,while injection of miR-125b precursor reverses it.Downregulation of miR-125b upregulates p53 cascade in both human and mouse embryos.The activation of miR-125b is shown to be mediated by sAC/PKA-dependent nuclear shuttling of NF-KB.These results have revealed a critical role of CFTR in signal transduction linking the environmental HCO3-to activation of miR-125b during preimplantation embryo development and indicated the importance of ion channels in regulation of miRNAs.

  14. Selection of reference genes for quantitative real-time PCR in bovine preimplantation embryos

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    Van Zeveren Alex

    2005-12-01

    Full Text Available Abstract Background Real-time quantitative PCR is a sensitive and very efficient technique to examine gene transcription patterns in preimplantation embryos, in order to gain information about embryo development and to optimize assisted reproductive technologies. Critical to the succesful application of real-time PCR is careful assay design, reaction optimization and validation to maximize sensitivity and accuracy. In most of the studies published GAPD, ACTB or 18S rRNA have been used as a single reference gene without prior verification of their expression stability. Normalization of the data using unstable controls can result in erroneous conclusions, especially when only one reference gene is used. Results In this study the transcription levels of 8 commonly used reference genes (ACTB, GAPD, Histone H2A, TBP, HPRT1, SDHA, YWHAZ and 18S rRNA were determined at different preimplantation stages (2-cell, 8-cell, blastocyst and hatched blastocyst in order to select the most stable genes to normalize quantitative data within different preimplantation embryo stages. Conclusion Using the geNorm application YWHAZ, GAPD and SDHA were found to be the most stable genes across the examined embryonic stages, while the commonly used ACTB was shown to be highly regulated. We recommend the use of the geometric mean of those 3 reference genes as an accurate normalization factor, which allows small expression differences to be reliably measured.

  15. Frequency of chromosomal aneuploidy in high quality embryos from young couples using preimplantation genetic screening

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    Farzaneh Fesahat

    2017-09-01

    Full Text Available Background: Selection of the best embryo for transfer is very important in assisted reproductive technology (ART. Using morphological assessment for this selection demonstrated that the correlation between embryo morphology and implantation potential is relatively weak. On the other hand, aneuploidy is a key genetic factor that can influence human reproductive success in ART. Objective: The aim of this lab trial study was to evaluate the incidence of aneuploidies in five chromosomes in the morphologically high-quality embryos from young patients undergoing ART for sex selection. Materials and Methods: A total of 97 high quality embryos from 23 women at the age of 37or younger years that had previously undergone preimplantation genetic screening for sex selection were included in this study. After washing, the slides of blastomeres from embryos of patients were reanalyzed by fluorescence in-situ hybridization for chromosomes 13, 18 and 21. Results: There was a significant rate of aneuploidy determination in the embryos using preimplantation genetic screening for both sex and three evaluated autosomal chromosomes compared to preimplantation genetic screening for only sex chromosomes (62.9% vs. 24.7%, p=0.000. The most frequent detected chromosomal aneuploidy was trisomy or monosomy of chromosome 13. Conclusion: There is considerable numbers of chromosomal abnormalities in embryos generated in vitro which cause in vitro fertilization failure and it seems that morphological characterization of embryos is not a suitable method for choosing the embryos without these abnormalities

  16. Occurrence of HLA- and non-HLA antibodies after heart transplantation are associated with cardiac allograft vasculopathy

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    Maja-Theresa Dieterlen

    2014-05-01

    Full Text Available Aims Cardiac allograft vasculopathy (CAV accounts for major morbidity and mortality late in the heart transplant (HTx history. The role of antibodies (Abs directed against human leukocyte antigens (HLA and non-HLA antigens in the pathogenesis of CAV are still under investigation. Materials and methods Sera of 116 long-term HTx recipients with CAV (n=46 and without CAV (n=70 were analysed by (1 Luminex for Abs against both HLA classes and major histocompatibility complex class I-related chain A (MICA, and by (2 ELISA for Abs against angiotensin-type-1-receptor (AT1R or endothelin-receptor-A (ETAR. Cellular rejection by endomyocardial biopsies and immunosuppressive drug therapy were analysed, too. Results HTx recipients developed higher levels of non-HLA-Abs than of Abs against HLA. CAV appeared more frequently in recipients with non-HLA-Abs (38.3% AT1R; 44.1% ETAR; 13.0% MICA than in recipients with HLA-Abs (8.7% HLA class I; 8.7% HLA class II. Recipients with non-HLA-Abs developed CAV earlier (73.7±47.4months than recipients without Abs (85.5±50.6months. Conclusion Occurrence of HLA-Abs and non-HLA-Abs contribute to CAV after HTx. Non-HLA-Abs were connected to an earlier and higher incidence of CAV. Recipients with subclinical cellular rejections and AT1R-Abs and ETAR-Abs as well as recipients with certain donor specific-Abs again HLA and MICA specifities are at risk to develop CAV.

  17. Differential Clade-Specific HLA-B*3501 Association with HIV-1 Disease Outcome Is Linked to Immunogenicity of a Single Gag Epitope

    Science.gov (United States)

    Matthews, Philippa C.; Koyanagi, Madoka; Harndahl, Mikkel; Stryhn, Anette; Akahoshi, Tomohiro; Gatanaga, Hiroyuki; Oka, Shinichi; Juarez Molina, Claudia; Valenzuela Ponce, Humberto; Avila Rios, Santiago; Cole, David; Carlson, Jonathan; Payne, Rebecca P.; Ogwu, Anthony; Bere, Alfred; Ndung'u, Thumbi; Gounder, Kamini; Chen, Fabian; Riddell, Lynn; Luzzi, Graz; Shapiro, Roger; Brander, Christian; Walker, Bruce; Sewell, Andrew K.; Reyes Teran, Gustavo; Heckerman, David; Hunter, Eric; Buus, Søren; Takiguchi, Masafumi; Goulder, Philip J. R.

    2012-01-01

    The strongest genetic influence on immune control in HIV-1 infection is the HLA class I genotype. Rapid disease progression in B-clade infection has been linked to HLA-B*35 expression, in particular to the less common HLA-B*3502 and HLA-B*3503 subtypes but also to the most prevalent subtype, HLA-B*3501. In these studies we first demonstrated that whereas HLA-B*3501 is associated with a high viral set point in two further B-clade-infected cohorts, in Japan and Mexico, this association does not hold in two large C-clade-infected African cohorts. We tested the hypothesis that clade-specific differences in HLA associations with disease outcomes may be related to distinct targeting of critical CD8+ T-cell epitopes. We observed that only one epitope was significantly targeted differentially, namely, the Gag-specific epitope NPPIPVGDIY (NY10, Gag positions 253 to 262) (P = 2 × 10−5). In common with two other HLA-B*3501-restricted epitopes, in Gag and Nef, that were not targeted differentially, a response toward NY10 was associated with a significantly lower viral set point. Nonimmunogenicity of NY10 in B-clade-infected subjects derives from the Gag-D260E polymorphism present in ∼90% of B-clade sequences, which critically reduces recognition of the Gag NY10 epitope. These data suggest that in spite of any inherent HLA-linked T-cell receptor repertoire differences that may exist, maximizing the breadth of the Gag-specific CD8+ T-cell response, by the addition of even a single epitope, may be of overriding importance in achieving immune control of HIV infection. This distinction is of direct relevance to development of vaccines designed to optimize the anti-HIV CD8+ T-cell response in all individuals, irrespective of HLA type. PMID:22973023

  18. Head and neck squamous cell carcinoma susceptibility genes in the HLA region

    NARCIS (Netherlands)

    Reinders, Judith

    2006-01-01

    The Human Leukocyte Antigen (HLA) region on the short arm of chromosome 6 includes the classical HLA genes and in addition HLA-related and non-HLA related genes. The majority of the genes located in this region are directly or indirectly involved in the immune response. The polymorphic HLA molecules

  19. Preimplantation genetic diagnosis of Von Hippel-Lindau disease cancer syndrome by combined mutation and segregation analysis

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    Denilce R. Sumita

    2007-03-01

    Full Text Available Von Hippel-Lindau (VHL disease is an autosomal dominant cancer syndrome, associated with the development of tumors and cysts in multiple organ systems, whose expression and age of onset are highly variable. The VHL disease tumor suppressor gene (VHL maps to 3p25-p26 and mutations ranging from a single base change to large deletions have been detected in patients with VHL disease. We developed a single cell PCR protocol for preimplantation genetic diagnosis (PGD of VHL disease to select unaffected embryos on the basis of the detection of the specific mutation and segregation analysis of polymorphic linked markers. Multiplex-nested PCR using single buccal cells of an affected individual were performed in order to test the accuracy and reliability of this single-cell protocol. For each locus tested, amplification efficiency was 83% to 87% and allelic drop-out rates ranged from 12% to 8%. Three VHL disease PGD cycles were performed on cells from a couple with paternal transmission of a 436delC mutation in exon 2 of the VHL gene, leading to the identification of three unaffected embryos. Independent of the mutation present, this general PGD protocol for the diagnosis of VHL disease can be used in families informative for either the D3S1038 or D3S1317 microsatellite markers.

  20. HLA class II genes: typing by DNA analysis.

    Science.gov (United States)

    Bidwell, J L; Bidwell, E A; Bradley, B A

    1990-04-01

    A detailed understanding of the structure and function of the human major histocompatibility complex (MHC) has ensued from studies by molecular biologist during the last decade. Virtually all of the HLA genes have now been cloned, and the nucleotide sequences of their different allelic forms have been determined. Typing for these HLA alleles is a fundamental prerequisite for tissue matching in allogeneic organ transplantation. Until very recently, typing procedures have been dominated by serological and cellular methods. The availability of cloned DNA from HLA genes has now permitted the technique of restriction fragment length polymorphism (RFLP) analysis to be applied, with remarkable success and advantage, to phenotyping of both HLA Class I and Class II determinants. For the HLA Class II genes DR and DQ, a simple two-stage RFLP analysis permits the accurate identification of all specificities defined by serology, and of many which are defined by cellular typing. At the present time, however, RFLP typing of HLA Class I genes is not as practicable or as informative as that for HLA Class II genes. The present clinical applications of HLA-DR and DQ RFLP typing are predominantly in phenotyping of living donors, including selection of HLA-matched volunteer bone marrow donors, in allograft survival studies, and in studies of HLA Class II-associated diseases. However, the time taken to perform RFLP analysis precludes its use for the typing of cadaveric kidney donors. Nucleotide sequence data for the alleles of HLA Class II genes have now permitted the development of allele-specific oligonucleotide (ASO) typing, a second category of DNA analysis. This has been greatly facilitated by the ability to amplify specific HLA Class II DNA 'target' sequences using the polymerase chain reaction (PCR) technique. The accuracy of DNA typing techniques should ensure that this methodology will eventually replace conventional HLA phenotyping.

  1. HLA-DRB1 alleles encoding the "shared epitope" are associated with susceptibility to developing rheumatoid arthritis whereas HLA-DRB1 alleles encoding an aspartic acid at position 70 of the beta-chain are protective in Mexican Mestizos.

    Science.gov (United States)

    Ruiz-Morales, J A; Vargas-Alarcón, G; Flores-Villanueva, P O; Villarreal-Garza, C; Hernández-Pacheco, G; Yamamoto-Furusho, J K; Rodríguez-Pérez, J M; Pérez-Hernández, N; Rull, M; Cardiel, M H; Granados, J

    2004-03-01

    The risk to develop rheumatoid arthritis (RA) has been associated with the presence of HLA-DRB1 alleles encoding the "shared epitope" (SE). Additionally, HLA-DRB1 alleles encoding an aspartic acid at position 70 (D70+ ) have been associated with protection against the development of RA. In this study we tested the association between either SE or D70+ and rheumatoid arthritis in Mexican Mestizos. We included 84 unrelated Mexican Mestizos patients with RA and 99 unrelated healthy controls. The HLA-typing was performed by PCR-SSO and PCR-SSP. We used the chi-squared test to detect differences in proportions of individuals carrying at least one SE or D70+ between patients and controls. We found that the proportion of individuals carrying at least one HLA-DRB1 allele encoding the SE was significantly increased in RA cases as compared to controls (p(c) = 0.0004, OR = 4.1, 95% CI = 2.2-7.7). The most frequently occurring allele was HLA-DRB1*0404 (0.161 vs 0.045). Moreover, we observed a significantly increased proportion of HLA-DRB1 SE+ cases with RF titers above the median (p = 0.005). Conversely, the proportion of individuals carrying at least one HLA-DRB1 allele encoding the D70+ was significantly decreased (p(c) = 0.004, OR = 0.4, 95% CI 0.2-0.7) among RA patients compared with controls. In conclusion, the SE is associated with RA in Mexican Mestizos as well as with the highest titers of RF.

  2. The HLA-B*15:02 allele in a Spanish Romani patient with carbamazepine-induced Stevens-Johnson syndrome.

    Science.gov (United States)

    Bellón, Teresa; Ramírez, Elena; Borobia, Alberto M; Lerma, Victoria; Moreno-Hidalgo, Miguel A; Laosa, Olga; Aramburu, José A; González-Herrada, Carlos; de Abajo, Francisco J

    2016-04-01

    The HLA-B*15:02 allele is a risk factor for carbamazepine (CBZ)-induced Stevens-Johnson syndrome/toxic epidermal necrolysis in populations where the allele is prevalent. Han Chinese and Thai patients are advised to take a genetic test before introducing CBZ. Such testing is not recommended for patients of European descent. We report the case of a Spanish Romani patient who developed Stevens-Johnson syndrome upon treatment with CBZ. In vitro assays confirmed CBZ as the culprit drug. HLA typing showed that the patient carried the HLA-B*15:02 allele. A public database search revealed that 2% of Spanish Romani people likely carry the risk variant HLA-B*15:02 and therefore may be included in the population to be tested prior to beginning treatment with CBZ.

  3. Homotypic aggregation of human cell lines by HLA class II-, class Ia- and HLA-G-specific monoclonal antibodies

    DEFF Research Database (Denmark)

    Odum, Niels; Ledbetter, J A; Martin, P

    1991-01-01

    adhesion between T and B cells by activating the CD18/CD11a (LFA-1) adhesion pathway. Here we report that monoclonal antibodies (mAb) against HLA-DR (L243, p4.1, HB10a, VI15) and certain broad class II reacting mAb (TU35, TU39), but not anti-DQ (TU22, Leu-10) mAb, induced homotypic aggregation of human......, but not the class I-negative parental line, 221, showed homotypic aggregation in response to an HLA-G specific mAb (87G) and a broad reacting class I-specific mAb (IOT2). Both cell lines responded with aggregation to anti-class II mAb (TU35). The anti-class I mAb, W6/32, had no effect on all cell lines tested...... and two anti-beta 2-microglobulin mAb had variable, weak effects. The aggregation response was an active, temperature-sensitive process which was almost totally abrogated by azide and by cytochalasins B and E, but unaffected by colchicine, EDTA, aphidicolin, actinomycin D and protein tyrosine kinase...

  4. HLA class I-mediated control of HIV-1 in the Japanese population, in which the protective HLA-B*57 and HLA-B*27 alleles are absent.

    Science.gov (United States)

    Naruto, Takuya; Gatanaga, Hiroyuki; Nelson, George; Sakai, Keiko; Carrington, Mary; Oka, Shinichi; Takiguchi, Masafumi

    2012-10-01

    We investigated the effect of HLA class I alleles on clinical parameters for HIV-1 disease progression in the Japanese population, where two strongly protective alleles, HLA-B*57 and HLA-B*27, are virtually nonexistent. HLA-B alleles showed a dominant role, primarily through HLA-B*67:01 and the HLA-B*52:01-C*12:02 haplotype. Neither a rare-allele nor a heterozygote advantage was found, suggesting that the effect of HLA alleles in the Japanese population is either different from those observed in Africans and Caucasians or undetectable due to limited power.

  5. Mutations in the HLA class II genes leading to loss of expression of HLA-DR and HLA-DQ in diffuse large B-cell lymphoma

    NARCIS (Netherlands)

    Jordanova, ES; Philippo, K; Giphart, MJ; Schuuring, E; Kluin, PM

    2003-01-01

    Loss of expression of human leukocyte antigen (HLA) class II molecules on tumor cells affects the onset and modulation of the immune response through lack of activation of CD4(+) T lymphocytes. Previously, we showed that the frequent loss of expression of HLA class II in diffuse large B-cell lymphom

  6. Haplotypes of the HLA-G 3’ Untranslated Region Respond to Endogenous Factors of HLA-G+ and HLA-G- Cell Lines Differentially

    Science.gov (United States)

    Cagnin, Natalia F.; Sgorla de Almeida, Bibiana; Castelli, Erick C.; Carosella, Edgardo D.; Donadi, Eduardo A.; Moreau, Philippe

    2017-01-01

    The immune checkpoint HLA-G prevents maternal rejection of the fetus and contributes in cancer invasion and acceptance of allografts. The 5’ and 3’ regulatory regions of the HLA-G gene are polymorphic and balancing selection probably maintains this variability. It is proposed that nucleotide variations may affect the level of HLA-G expression. To investigate this issue we aimed to analyze how haplotypes of the 3’ untranslated region (3’UTR) with highest worldwide frequencies, namely UTR-1, UTR-2, UTR-3, UTR-4, UTR-5, UTR-18 and UTR-7, impact the expression of a luciferase reporter gene in vitro. Experiments performed with the HLA-G positive cell lines JEG-3 (choricarcinoma) and FON (melanoma), and with the HLA-G negative cell lines M8 (melanoma) and U251MG (glioblastoma) showed that the HLA-G 3’UTR polymorphism influences the response to endogenous cellular factors and may vary according to the cell type. UTR-5 and UTR-7 impact the activity of luciferase the most whereas UTR-2, UTR-3, UTR-4, and UTR-18 have intermediate impact, and UTR-1 has the lowest impact. These results corroborate the previous associations between amounts of plasma sHLA-G levels and 3’UTR haplotypes in healthy individuals and reinforce that 3’UTR typing may be a predictor of the genetic predisposition of an individual to express different levels of HLA-G. PMID:28045999

  7. Role of HLA adaptation in HIV evolution

    DEFF Research Database (Denmark)

    Kløverpris, Henrik N.; Leslie, Alasdair; Goulder, Philip

    2016-01-01

    Killing of HIV-infected cells by CD8+ T-cells imposes strong selection pressure on the virus toward escape. The HLA class I molecules that are successful in mediating some degree of control over the virus are those that tend to present epitopes in conserved regions of the proteome, such as in p24...... Gag, in which escape also comes at a significant cost to viral replicative capacity (VRC). In some instances, compensatory mutations can fully correct for the fitness cost of such an escape variant; in others, correction is only partial. The consequences of these events within the HIV-infected host......, and at the population level following transmission of escape variants, are discussed. The accumulation of escape mutants in populations over the course of the epidemic already shows instances of protective HLA molecules losing their impact, and in certain cases, a modest decline in HIV virulence in association...

  8. miR-152调节JEG-3细胞中HLA-G的表达%Effect of MIR-152 on Expression of HLA-G in JEG-3 Cells

    Institute of Scientific and Technical Information of China (English)

    朱晓明; 王晓红; 姜锋; 肖西峰; 尹国武

    2011-01-01

    Objective To investigate the effect of miR-152 on the expression of HLA-G in JEG-3 cells.Methods The trophoblastic tumor JEG-3 cells were transfected with pre-miR-152( as test group) ,pre-miRNA-control labeled with dye Cy3 (as negative control), and with nothing( normal control, NC ), respectively.48 and 72 hours after transfction, cells were used for RT-PCR and Western blot analysis to investigate the expression of miR-152 mRNA and HLA-G mRNA, HLA-G protein,respectively.Results After pre-miR-152 transfection, RT-PCR analysis showed that the transfection was effective( P < 0.05 ) ,whereas no significant changes were observed in the mRNA level of HLA-G.However,the cells transfected with pre-miR-152 significantly decrease the HLA-G protein level(P < 0.05).Conclusion The miR-152 can down-regulate the expression of HLA-G by inhibiting the translation process.%目的 研究miR-152分子对JEG-3细胞中HLA-G表达水平的调控.方法 在滋养细胞肿瘤细胞系JEG-3细胞中分别转染pre-miR-152(实验组),Cy3标记的pre-miRNA-control(阴性对照),空白对照(NC)为未转染的JEG-3细胞.转染48 h、72 h分别进行RT-PCR与Western blot实验检测细胞中miR-152、HLA-G mRNA与蛋白的表达水平.结果 RT-PCR结果 显示在细胞中转染pre-miR-152分子后miR-152的表达显著增高(P0.05).Western blot结果 显示与对照组相比,实验组的HLA-G蛋白表达水平显著降低(P<0.05).结论 miR-152可能在翻译水平抑制HLA-G的表达.

  9. HLA-A, HLA-B and HLA-DRB1 allele and haplotype frequencies of 10 918 Koreans from bone marrow donor registry in Korea.

    Science.gov (United States)

    Park, H; Lee, Y-J; Song, E Y; Park, M H

    2016-10-01

    The human leucocyte antigen (HLA) system is the most polymorphic genetic system in humans, and HLA matching is crucial in organ transplantation, especially in hematopoietic stem cell transplantation. We investigated HLA-A, HLA-B and HLA-DRB1 allele and haplotype frequencies at allelic level in 10 918 Koreans from bone marrow donor registry in Korea. Intermediate resolution HLA typing was performed using Luminex technology (Wakunaga, Japan), and additional allelic level typing was performed using PCR-single-strand conformation polymorphism method and/or sequence-based typing (Abbott Molecular, USA). Allele and haplotype frequencies were calculated by direct counting and maximum likelihood methods, respectively. A total of 39 HLA-A, 66 HLA-B and 47 HLA-DRB1 alleles were identified. High-frequency alleles found at a frequency of ≥5% were 6 HLA-A (A*02:01, *02:06, *11:01, *24:02, *31:01 and *33:03), 6 HLA-B (B*15:01, *35:01, *44:03, *51:01, 54:01 and *58:01) and 8 HLA-DRB1 (DRB1*01:01, *04:05, *04:06, *07:01, *08:03, *09:01, *13:02 and *15:01) alleles. At each locus, A*02, B*15 and DRB1*14 generic groups were most diverse at allelic level, consisting of 9, 12 and 11 different alleles, respectively. A total of 366, 197 and 21 different HLA-A-B-DRB1 haplotypes were estimated with frequencies of ≥0.05%, ≥0.1% and ≥0.5%, respectively. The five most common haplotypes with frequencies of ≥2.0% were A*33:03-B*44:03-DRB1*13:02 (4.97%), A*33:03-B*58:01-DRB1*13:02, A*33:03-B*44:03-DRB1*07:01, A*24:02-B*07:02-DRB1*01:01 and A*24:02-B*52:01-DRB1*15:02. Among 34 serologic HLA-A-B-DR haplotypes with frequencies of ≥0.5%, 17 haplotypes revealed allele-level diversity and majority of the allelic variation was arising from A2, A26, B61, B62, DR4 and DR14 specificities. Haplotype diversity obtained in this study is the most comprehensive data thus far reported in Koreans, and the information will be useful for unrelated stem cell transplantation as well as for disease

  10. HLA-G Molecules in Autoimmune Diseases and Infections

    Science.gov (United States)

    Rizzo, Roberta; Bortolotti, Daria; Bolzani, Silvia; Fainardi, Enrico

    2014-01-01

    Human leukocyte antigen (HLA)-G molecule, a non-classical HLA-Ib molecule, is less polymorphic when compared to classical HLA class I molecules. Human leukocyte antigen-G (HLA-G) was first detected on cytotrophoblast cells at the feto-maternal interface but its expression is prevalent during viral infections and several autoimmune diseases. HLA-G gene is characterized by polymorphisms at the 3′ un-translated region and 5′ upstream regulatory region that regulate its expression and are associated with autoimmune diseases and viral infection susceptibility, creating an unbalanced and pathologic environment. This review focuses on the role of HLA-G genetic polymorphisms, mRNA, and protein expression in autoimmune conditions and viral infections. PMID:25477881

  11. [The HLA system in the Moroccan population: General review].

    Science.gov (United States)

    Brick, C; Atouf, O; Essakalli, M

    2015-01-01

    The Moroccan population is an interesting study model of Human Leukocyte Antigen (HLA) polymorphism given its ethnic and genetic diversity. Through an analysis of the literature, this work proposes to establish a balance of knowledge for this population in the field of histocompatibility: HLA diversity, anthropology, transplantation and HLA associations and diseases. This analysis shows that the HLA system has not been fully explored within the Moroccan population. However, the results obtained allowed us to initiate a database reflecting the specific healthy Moroccan population HLA polymorphism to identify immigration flows and relationships with different people of the world and to reveal the association of certain HLA alleles with frequent pathologies. We also propose to analyze the reasons hindering the development of this activity in Morocco and we will try to identify some perspectives. Copyright © 2015 Elsevier Masson SAS. All rights reserved.

  12. Identification of two new HLA-B alleles, HLA-B*0732 and HLA-B*5809, by sequence-based typing.

    Science.gov (United States)

    Longhi, E; Frison, S; Poli, F; Espadas de Arias, A; Zanuso, C; Guizzardi, E; Scalamogna, M

    2004-03-01

    Here, we have described the characterization of two novel human leukocyte antigen-B (HLA-B) alleles. The new alleles, HLA-B*0732 and HLA-B*5809, were identified in Italian Caucasian individuals. B*0732 differs from HLA-B*0708 by one nucleotidic change at position 412 (from G to A) in exon 3, leading to an amino acidic substitution from Asp (GAC) to Asn (AAC) at codon 114. The sequence of B*5809 is identical to that of HLA-B*5801, except for a point mutation at position 583 in exon 3, where a T is substituted by a C. This change leads to an amino acidic substitution from Tyr (TAC) to His (CAC) at codon 171.

  13. Impact of HLA Selection Pressure on HIV Fitness at a Population Level in Mexico and Barbados

    Science.gov (United States)

    Payne, Rebecca; Soto-Nava, Maribel; Avila-Rios, Santiago; Valenzuela-Ponce, Humberto; Adland, Emily; Leitman, Ellen; Brener, Jacqui; Muenchhoff, Maximilian; Branch, Songee; Landis, Clive; Reyes-Teran, Gustavo; Goulder, Philip

    2014-01-01

    ABSTRACT Previous studies have demonstrated that effective cytotoxic T lymphocyte (CTL) responses drive the selection of escape mutations that reduce viral replication capacity (VRC). Escape mutations, including those with reduced VRC, can be transmitted and accumulate in a population. Here we compared two antiretroviral therapy (ART)-naive HIV clade B-infected cohorts, in Mexico and Barbados, in which the most protective HLA alleles (HLA-B*27/57/58:01/81:01) are differentially expressed, at 8% and 34%, respectively. Viral loads were significantly higher in Mexico than in Barbados (median, 40,774 versus 14,200; P < 0.0001), and absolute CD4+ T-cell counts were somewhat lower (median, 380/mm3 versus 403/mm3; P = 0.007). We tested the hypothesis that the disparate frequencies of these protective HLA alleles would be associated with a higher VRC at the population level in Mexico. Analysis of VRC in subjects in each cohort, matched for CD4+ T-cell count, revealed that the VRC was indeed higher in the Mexican cohort (mean, 1.13 versus 1.03; P = 0.0025). Although CD4 counts were matched, viral loads remained significantly higher in the Mexican subjects (P = 0.04). This VRC difference was reflected by a significantly higher frequency in the Barbados cohort of HLA-B*27/57/58:01/81:01-associated Gag escape mutations previously shown to incur a fitness cost on the virus (P = 0.004), a difference between the two cohorts that remained statistically significant even in subjects not expressing these protective alleles (P = 0.01). These data suggest that viral set points and disease progression rates at the population level may be significantly influenced by the prevalence of protective HLA alleles such as HLA-B*27/57/58:01/81:01 and that CD4 count-based guidelines to initiate antiretroviral therapy may need to be modified accordingly, to optimize the effectiveness of treatment-for-prevention strategies and reduce HIV transmission rates to the absolute minimum. IMPORTANCE Immune

  14. [Is tendinosis calcarea associated with HLA-A1?].

    Science.gov (United States)

    Gärtner, J

    1993-01-01

    Increased frequency of HLA-A1 in calcifying tendinitis? In a study with 46 patients Sengar et al. observed an association of calcifying tendinitis and HLA-A1 in 50% (normal regional frequency: 26.7%). In our study with 55 patients we found a presence of HLA-A1 in only 32.7% (normal regional frequency: 30.5%), there was no increased frequency.

  15. Role of HLA, KIR, MICA, and Cytokines Genes in Leprosy

    OpenAIRE

    Luciana Ribeiro Jarduli; Ana Maria Sell; Pâmela Guimarães Reis; Emília Ângela Sippert; Christiane Maria Ayo; Priscila Saamara Mazini; Hugo Vicentin Alves; Jorge Juarez Vieira Teixeira; Jeane Eliete Laguila Visentainer

    2013-01-01

    Many genes including HLA, KIR, and MICA genes, as well as polymorphisms in cytokines have been investigated for their role in infectious disease. HLA alleles may influence not only susceptibility or resistance to leprosy, but also the course of the disease. Some combinations of HLA and KIR may result in negative as well as positive interactions between NK cells and infected host cells with M. leprae, resulting in activation or inhibition of NK cells and, consequently, in death of bacillus. In...

  16. HLA-C Downmodulation by HIV-1 Vpu.

    Science.gov (United States)

    Barker, Edward; Evans, David T

    2016-05-11

    It is widely held that HIV-1 Nef downmodulates HLA-A and -B to protect infected cells from CD8(+) T cells but leaves HLA-C on the cell surface to inhibit NK cells. In this issue of Cell Host & Microbe, Apps et al. (2016) revise this model by showing that the Vpu protein of primary HIV-1 isolates downmodulate HLA-C.

  17. Effectiveness of a novel immunogenic nanoparticle platform for Toxoplasma peptide vaccine in HLA transgenic mice.

    Science.gov (United States)

    El Bissati, Kamal; Zhou, Ying; Dasgupta, Debleena; Cobb, Drew; Dubey, Jitender P; Burkhard, Peter; Lanar, David E; McLeod, Rima

    2014-05-30

    We created and produced a novel self-assembling nanoparticle platform for delivery of peptide epitopes that induces CD8(+) and CD4(+)T cells that are protective against Toxoplasma gondii infection. These self-assembling polypeptide nanoparticles (SAPNs) are composed of linear peptide (LP) monomers which contain two coiled-coil oligomerization domains, the dense granule 7 (GRA720-28 LPQFATAAT) peptide and a universal CD4(+)T cell epitope (derived from PADRE). Purified LPs assemble into nanoparticles with icosahedral symmetry, similar to the capsids of small viruses. These particles were evaluated for their efficacy in eliciting IFN-γ by splenocytes of HLA-B*0702 transgenic mice and for their ability to protect against subsequent T. gondii challenge. This work demonstrates the feasibility of using this platform approach with a CD8(+) epitope that binds HLA-B7 and tests the biological activity of potentially protective peptides restricted by human major histocompatibility complex (HLA) class I molecules in HLA transgenic mice.

  18. HLA class II sequence variants influence tuberculosis risk in populations of European ancestry

    Science.gov (United States)

    Sveinbjornsson, Gardar; Gudbjartsson, Daniel F.; Halldorsson, Bjarni V.; Kristinsson, Karl G.; Gottfredsson, Magnus; Barrett, Jeffrey C.; Gudmundsson, Larus J.; Blondal, Kai; Gylfason, Arnaldur; Gudjonsson, Sigurjon Axel; Helgadottir, Hafdis T.; Jonasdottir, Adalbjorg; Jonasdottir, Aslaug; Karason, Ari; Kardum, Ljiljana Bulat; Knežević, Jelena; Kristjansson, Helgi; Kristjansson, Mar; Love, Arthur; Luo, Yang; Magnusson, Olafur T.; Sulem, Patrick; Kong, Augustine; Masson, Gisli; Thorsteinsdottir, Unnur; Dembic, Zlatko; Nejentsev, Sergey; Blondal, Thorsteinn; Jonsdottir, Ingileif; Stefansson, Kari

    2016-01-01

    Mycobacterium tuberculosis (M. tuberculosis) infections cause 9.0 million new tuberculosis (TB) cases and 1.5 million deaths annually1. To search for sequence variants that confer risk of TB we tested 28.3 million variants identified through whole-genome sequencing of 2,636 Icelanders for association with TB (8,162 cases and 277,643 controls), pulmonary TB (PTB), and M. tuberculosis infection. We found association of three sequence variants in the HLA class II region: rs557011[T] (MAF=40.2%) with M. tuberculosis infection (OR =1.14, P=3.1×10-13) and PTB (OR=1.25, P=5.8×10-12) and rs9271378[G] (MAF=32.5%) with PTB (OR=0.78, P=2.5×10-12), both located between HLA-DQA1 and HLA-DRB1. Finally, a missense variant p.Ala210Thr in HLA-DQA1, (MAF=19.1%, rs9272785) shows association with M. tuberculosis infection (P=9.3×10-9, OR=1.14). The association of these variants with PTB was replicated in large samples of European ancestry from Russia and Croatia (Ptuberculosis, possibly through reduced presentation of protective M. tuberculosis antigens to T cells. PMID:26829749

  19. Widespread non-additive and interaction effects within HLA loci modulate the risk of autoimmune diseases

    Science.gov (United States)

    Lenz, Tobias L.; Deutsch, Aaron J.; Han, Buhm; Hu, Xinli; Okada, Yukinori; Eyre, Stephen; Knapp, Michael; Zhernakova, Alexandra; Huizinga, Tom W.J.; Abecasis, Goncalo; Becker, Jessica; Boeckxstaens, Guy E.; Chen, Wei-Min; Franke, Andre; Gladman, Dafna D.; Gockel, Ines; Gutierrez-Achury, Javier; Martin, Javier; Nair, Rajan P.; Nöthen, Markus M.; Onengut-Gumuscu, Suna; Rahman, Proton; Rantapää-Dahlqvist, Solbritt; Stuart, Philip E.; Tsoi, Lam C.; Van Heel, David A.; Worthington, Jane; Wouters, Mira M.; Klareskog, Lars; Elder, James T.; Gregersen, Peter K.; Schumacher, Johannes; Rich, Stephen S.; Wijmenga, Cisca; Sunyaev, Shamil R.; de Bakker, Paul I.W.; Raychaudhuri, Soumya

    2015-01-01

    Human leukocyte antigen (HLA) genes confer strong risk for autoimmune diseases on a log-additive scale. Here we speculated that differences in autoantigen binding repertoires between a heterozygote’s two expressed HLA variants may result in additional non-additive risk effects. We tested non-additive disease contributions of classical HLA alleles in patients and matched controls for five common autoimmune diseases: rheumatoid arthritis (RA, Ncases=5,337), type 1 diabetes (T1D, Ncases=5,567), psoriasis vulgaris (Ncases=3,089), idiopathic achalasia (Ncases=727), and celiac disease (Ncases=11,115). In four out of five diseases, we observed highly significant non-additive dominance effects (RA: P=2.5×1012; T1D: P=2.4×10−10; psoriasis: P=5.9×10−6; celiac disease: P=1.2×10−87). In three of these diseases, the dominance effects were explained by interactions between specific classical HLA alleles (RA: P=1.8×10−3; T1D: P=8.6×1027; celiac disease: P=6.0×10−100). These interactions generally increased disease risk and explained moderate but significant fractions of phenotypic variance (RA: 1.4%, T1D: 4.0%, and celiac disease: 4.1%, beyond a simple additive model). PMID:26258845

  20. RAPID HLA-DRB1 GENERIC TYPING BY PCR-SSP METHOD

    Institute of Scientific and Technical Information of China (English)

    邱长春; 赵岩; 陶贞寅; 朱席林; 徐作军; 董怡

    1995-01-01

    We report a simple and rapid HLA-DRB1 generic typing metbod,PCR-SSP,which is practical and inexpensive.We use 9 sequence-specific primers and 2 group specific primers to define the HLA-DRB1 specificities DR1,DR2,DR3,DR4,DR5,DR6,DR7,DR8,DR9 and DR10. The HLA DR3,DR5,DR6 and DR8 can be amplified by the two primers of DR3568 are positive.Any individuals can be typed with some exception: the three pairs of phenotype DR3/DR3 and DR3/DR6,DR5/DR5 and DR5/DR6, DR8/DR8 and DR8/DR6 cannot be discriminated from each other.We typed 106 unrelated healthy people from Beijing locations in two weeks.We think this typing method is suitable to replace the error-Prone serologic HLA-DR tests in routine clinical practice,including the prospective typing of cadaveric organ donors.

  1. HLA-Cw group 1 ligands for KIR increase susceptibility to invasive cervical cancer.

    Science.gov (United States)

    Martin, Maureen P; Borecki, Ingrid B; Zhang, Zhengyan; Nguyen, Loan; Ma, Duanduan; Gao, Xiaojiang; Qi, Ying; Carrington, Mary; Rader, Janet S

    2010-12-01

    Inherited genetic polymorphisms within immune response genes have been shown to associate with risk of invasive cervical cancer (ICC) and its immediate precursor, cervical intraepithelial neoplasia grade 3. Here, we used the transmission/disequilibrium test to detect disease-liability alleles and investigate haplotype transmission of KIR and HLA class I polymorphisms in a large family-based population of women with cervical cancer and their biological parents (359 trios). The effect of distinct human papillomavirus types was also explored. HLA-Cw group 1 (HLA-Cw alleles with asparagine at position 80), which serves as ligand for certain killer immunoglobulin-like receptors (KIR), was significantly overtransmitted in women with ICC (P = 0.04), and particularly in the subgroup of women infected with high risk HPV16 or 18 subtypes (P = 0.008). These data support the involvement of the HLA-C locus in modulating the risk of cervical neoplasia perhaps through its function as ligands for KIR, but functional studies are essential to confirm this hypothesis.

  2. The frequency of HLA-B(∗)57:01 and the risk of abacavir hypersensitivity reactions in the majority population of Costa Rica.

    Science.gov (United States)

    Arrieta-Bolaños, Esteban; Madrigal, J Alejandro; Marsh, Steven G E; Shaw, Bronwen E; Salazar-Sánchez, Lizbeth

    2014-11-01

    HLA-B(∗)57:01 is a well-known and cost-effective pharmacogenetic marker for abacavir hypersensitivity. As with other HLA alleles, there is widespread variation in its frequency across populations. The Costa Rica Central Valley Population (CCVP) is the major population in this country. The frequency of HLA-B(∗)57:01 in this population has not been described yet. Thus, our aim was to determine the frequency of this allele in the CCVP. 200 unrelated healthy volunteer donors born in the CCVP were typed. HLA-B(∗)57-positive samples identified by HLA intermediate resolution typing methods were further typed by SBT to high resolution. An HLA-B(∗)57:01 carrier frequency of 5.00% was determined in this sample. This frequency is relatively high in comparison to reports from other populations in Latin America. These results suggest that there is a considerable frequency of HLA-B(∗)57:01 in the CCVP and that pharmacogenetic testing for HIV+ patients who are going to receive abacavir-based treatment should be considered in this country.

  3. Molecular genetic studies on the compatibility of HLA class II alleles in patients with unexplained recurrent miscarriage in the Japanese population.

    Science.gov (United States)

    Takakuwa, Koichi; Honda, Keisuke; Yokoo, Tomokazu; Hataya, Isao; Tamura, Masaki; Tanaka, Kenichi

    2006-01-01

    It is hypothesized that patients having unexplained recurrent miscarriage lack an appropriate immune reaction against their partner's antigens, which means possible compatibility of HLA antigens between the patient couples. The conclusion, however, has not yet been achieved, so the purpose was to determine whether significant compatibility of HLA class II exists between the couples. The HLA-DRB1 and -DQB1 genotypes were determined using PCR-RFLP method in 91 patient couples and in 72 normal couples. The number of patient couples with zero-allele mismatch was not significantly different compared with that of control couples regarding HLA-DRB1 genotype and phenotype, as well as regarding HLA-DQB1 genotype and phenotype. While the number of patient couples with zero- and one-allele mismatch was significantly higher compared with that in control as to HLA-DR and -DQ phenotype (P=0.029 by Chi-square test). In conclusion, it is suggested that the compatibility of HLA class II antigens between couples might be involved in the genesis of unexplained recurrent miscarriage.

  4. HLA DRB1* ASSOCIATION WITH REPRODUCTIVE DISORDERS IN WOMEN

    Directory of Open Access Journals (Sweden)

    L. A. Gordeeva

    2007-01-01

    Full Text Available Abstract. HLA DRB1* gene associations with idiopathic fetal losses and infertility were studied in women. It was shown that idiopathic fetal losses are associated with HLA DRB1*04 specificity, whereas infertility correlated with HLA DRB1*04/07 genotype. The associations revealed may indicate to a special role of autoimmune events in women during pregnancy. The authors suggest a hypothesis on existence of several immune modes of reproductive losses. HLA genotyping may be applied as a basic technique for their determination.

  5. HLA-B27 Determination by Polymerase Chain Reaction

    Directory of Open Access Journals (Sweden)

    D. C. Kilpatrick

    1996-01-01

    Full Text Available A method for determining the presence or absence of HLA-827 by selective amplification of a region in the third exon of the HLA-B27 gene common to B*270 I to B*2705 inclusive, was evaluated. This polymerase chain reaction/sequence specific primer (PCR-SSP method gave perfect correlation with serological typing on 40 individuals of previously determined HLA type and on 50 further clinical samples elaluated blind. It was concluded that HLA-B27 determination by PCR-SSP is simple, reliable. cost-effectile and convient for laboratory staff.

  6. HLA-B27 Determination by Polymerase Chain Reaction

    OpenAIRE

    Kilpatrick, D C

    1996-01-01

    A method for determining the presence or absence of HLA-827 by selective amplification of a region in the third exon of the HLA-B27 gene common to B*270 I to B*2705 inclusive, was evaluated. This polymerase chain reaction/sequence specific primer (PCR-SSP) method gave perfect correlation with serological typing on 40 individuals of previously determined HLA type and on 50 further clinical samples elaluated blind. It was concluded that HLA-B27 determination by PCR-SSP is simple, reliable. cost...

  7. Investigating interoperability between JC3IEDM and HLA

    CSIR Research Space (South Africa)

    Uys, DC

    2009-07-01

    Full Text Available The three core parts of the HLA standard are the Object Model Templates(OMT), interface speci - cation for the Run-Time Interface (RTI) and HLA rules. The OMT speci es how the object models should be de ned, the RTI provides inter-process communications... is referred to as an object model. Federates that wish to inter-operate using HLA must use the same object model. HLA de nes Object Model Templates (OMT) that specify the format of a Federation Object Model (FOM). The FOM is then used together with some...

  8. HLA-DP antigens in patients with alopecia areata

    DEFF Research Database (Denmark)

    Ødum, Niels; Morling, N; Georgsen, J

    1990-01-01

    The distribution of HLA-DP antigens were studied in 41 patients with alopecia areata (AA) and 188 ethnically matched controls. An increase of DR4 and possibly DR5 in 24 of these patients has previously been reported. HLA-DP typing for DPw1 through w6 and the local specificity, CDP HEI, was perfor......The distribution of HLA-DP antigens were studied in 41 patients with alopecia areata (AA) and 188 ethnically matched controls. An increase of DR4 and possibly DR5 in 24 of these patients has previously been reported. HLA-DP typing for DPw1 through w6 and the local specificity, CDP HEI...

  9. Research progression on preimplantation genetic diagnosis and screening%胚胎植入前遗传学诊断和筛查的研究进展

    Institute of Scientific and Technical Information of China (English)

    刘茜桐; 田莉; 师娟子

    2016-01-01

    胚胎植入前遗传学诊断( PGD)和筛查( PGS)是近年来发展的植入前遗传学检测( PGT)方法。 PGD主要适用于父母携带基因突变或染色体平衡易位,通过体外受精,在胚胎移植前检测特定的突变以及非平衡染色体异常是否传递到卵子或胚胎。 PGS是运用相同的检测方法检测胚胎染色体非整倍性,通过移植正常的胚胎从而提高妊娠率。 PGD/PGS相关检测技术发展日新月异,传统FISH技术逐渐被取代,更多的新技术也在研发中。但是,PGD/PGS仍存在费用昂贵,无法检测所有胚胎异常等不足之处。该文综述PGD/PGS相关进展和PGD/PGS所存在的问题。%Preimplantation genetic diagnosis ( PGD) and preimplantation genetic screening ( PGS) are recently developed preimplantation genetic testing ( PGT) .PGD is applied when one or both genetic parents carry a gene mutation or a balanced chromosomal rearrangement and testing is performed to determine whether that specific mutation or an unbalanced chromosomal complement has been transmitted to the oocyte or embryo .PGS uses the same method for detecting embryo chromosomal aneuploidy in order to improve pregnancy rate .With the development of new technology related with PGD /PGS, FISH is gradually being replaced and new methods are under research .However , PGD/PGS is expensive and can not detect all abnormalities of the embryo .This article reviewed the advancement and shortcomings of PGD/PGS.

  10. Expression of HLA-G mRNA and Protein Levels in Pre-eclampsia at Plateau Area%青海地区子痫前期患者HLA-GmRNA及蛋白表达研究

    Institute of Scientific and Technical Information of China (English)

    谢莹莺; 李凤莲; 刘春燕; 杨娟; 李琴

    2012-01-01

    目的:探讨青海高原地区子痫前期患者人类白细胞相关抗原G(HLA-G) mRNA、蛋白表达情况及临床意义.方法:收集2011年9月至2011年12月在青海大学附属医院产科分娩的30例子痫前期患者和30例正常妊娠妇女的胎盘组织和血清样品,采用实时荧光定量PCR及Western blot分析检测HLA-G mRNA和蛋白在正常妊娠与子痫前期患者胎盘中的表达差异,并应用双抗体夹心酶联免疫吸附法(ELISA)检测血清中可溶性HLA-G的表达.结果:①青海高原地区子痫前期患者胎盘组织中HLA-G mRNA、蛋白表达水平明显低于正常妊娠组,差异有统计学意义(P<0.05).②子痫前期患者血清中可溶型HLA-G (sHLA-G)浓度明显低于正常妊娠组,差异有统计学意义(P<0.05).结论:HLA-G基因转录的下调及其蛋白质表达下降,在青海高原地区子痫前期的发生发展过程中可能发挥重要作用.%Objective:To investigate the expression and the clinical significance of HLA-G at the mRNA and the protein levels in pre-eclampsia patients at the plateau area of Qinghai. Methods:The placental tissue and serum sample of 30 normal pregnant women and 30 patients with pre-eclampsias were collected. Using real time polymerase chain reaction and Western blot analysis, we detected HLA-G mRNA and protein levels in placental tissues. Serum sample was tested for soluble HLA-G (sHLA-G) protein by using a validated sandwich ELISA. Results :(1)The expressions of HLA-G mRNA and protein in pre-eclampsia group were significantly lower than those in control group( P <0.05). (2)The maternal serum concentrations of sHLA-G in pre-eclampsia group were significantly decreased compared with those in normal pregnant women. Conclusions: The decreasing of HLA-G mRNA and protein expressions may play an important role in the occurrence and development of pre-eclampsia in the plateau area.

  11. The peptide-binding specificity of HLA-A*3001 demonstrates membership of the HLA-A3 supertype

    DEFF Research Database (Denmark)

    Lamberth, K; Røder, G; Harndahl, M;

    2008-01-01

    haplotype in populations of African descent, has variously been assigned to the A1, A3, or A24 supertypes. Using a biochemical HLA-A*3001 binding assay, and a large panel of nonamer peptides and peptide libraries, we here demonstrate that the specificity of HLA-A*3001 most closely resembles that of the HLA-A......3 supertype. We discuss approaches to supertype assignment and underscore the importance of experimental verification....

  12. Frequency determination of HLA-DRB1 and HLA-DQB1 alleles in children with primary vesicoureteral reflux

    Directory of Open Access Journals (Sweden)

    Mohammadreza Bazrafshani

    2014-12-01

    Conclusion: The HLA cluster might affect on susceptibility to vesicoureteral reflux es-pecially by locus which located close to HLA-DRB1 and HLA-DQB1 genes. This study demonstrates for the first time in Iran. However, further extensive researches with a large number of samples from different populations and ethnicities are required to val-idate the results obtained in this study.

  13. Structural basis of cross-allele presentation by HLA-A*0301 and HLA-A*1101 revealed by two HIV-derived peptide complexes.

    Science.gov (United States)

    Zhang, Shihong; Liu, Jun; Cheng, Hao; Tan, Shuguang; Qi, Jianxun; Yan, Jinghua; Gao, George F

    2011-10-01

    Human leukocyte antigens (HLA) are initially classified by serotyping but recently can be re-grouped by their peptide-presentation characteristics into supertypes. Both HLA-A*0301 and HLA-A*1101 are grouped into A3 supertype. Although a number of cross-presented T cell epitopes of HLA-A*0301 and HLA-A*1101 have been identified, the molecular mechanisms of cross-presentation remain elusive. Herein, the structures of HLA-A*0301 with two HIV-derived immunodominant T cell epitopes were solved and their characteristics in comparison with HLA-A*1101 presenting the same peptides were analyzed. The comparable structures of HLA-A*0301 and HLA-A*1101 with subtle differences illustrate the common modes of cross-presented peptides and the strict HLA-restriction of T cell receptor (TCR)-recognition.

  14. Nonpermissive HLA-DPB1 disparity is a significant independent risk factor for mortality after unrelated hematopoietic stem cell transplantation.

    Science.gov (United States)

    Crocchiolo, Roberto; Zino, Elisabetta; Vago, Luca; Oneto, Rosi; Bruno, Barbara; Pollichieni, Simona; Sacchi, Nicoletta; Sormani, Maria Pia; Marcon, Jessica; Lamparelli, Teresa; Fanin, Renato; Garbarino, Lucia; Miotti, Valeria; Bandini, Giuseppe; Bosi, Alberto; Ciceri, Fabio; Bacigalupo, Andrea; Fleischhauer, Katharina

    2009-08-13

    The importance of donor-recipient human leukocyte antigen (HLA)-DPB1 matching for the clinical outcome of unrelated hematopoietic stem cell transplantation (HSCT) is controversial. We have previously described an algorithm for nonpermissive HLA-DPB1 disparities involving HLA-DPB1*0901,*1001,*1701,*0301,*1401,*4501, based on T-cell alloreactivity patterns. By revisiting the immunogenicity of HLA-DPB1*02, a modified algorithm was developed and retrospectively tested in 621 unrelated HSCTs facilitated through the Italian Registry for oncohematologic adult patients. The modified algorithm proved to be markedly more predictive of outcome than the original one, with significantly higher Kaplan-Meier probabilities of 2-year survival in permissive compared with nonpermissive transplantations (55% vs 39%, P = .005). This was the result of increased adjusted hazards of nonrelapse mortality (hazard ratio [HR] = 1.74; confidence interval [CI], 1.19-2.53; P = .004) but not of relapse (HR = 1.02; CI, 0.73-1.42; P = .92). The increase in the hazards of overall mortality by nonpermissive HLA-DPB1 disparity was similar in 10 of 10 (HR = 2.12; CI, 1.23-3.64; P = .006) and 9 of 10 allele-matched transplantations (HR = 2.21; CI, 1.28-3.80; P = .004), both in early-stage and in advanced-stage disease. These data call for revisiting current HLA matching strategies for unrelated HSCT, suggesting that searches should be directed up-front toward identification of HLA-DPB1 permissive, 10 of 10 or 9 of 10 matched donors.

  15. HLA-DQBl*0402 alleles polymorphisms detected in Javanese HIV patients with positive anti-Toxoplasma gondii IgM

    Science.gov (United States)

    Sari, Yulia; Haryati, Sri; Prasetyo, Afiono Agung; Hartono, Adnan, Zainal Arifin

    2017-02-01

    The human leukocyte antigen (HLA)-DQB1 gene polymorphisms may associated with the infection risk of Toxoplasma gondii in HIV patients. The HLA-DQB1*0402 in HIV-1-positive patients could be considered risk factors for developing neurological opportunistic infections, mainly Toxoplasma encephalitis. However, the HLA-DQB1*0402 gene polymorphisms status in the Javanese HIV patients is unknown. This study evaluated the prevalence of HLA-DQB*0402 alleles polymorphisms in Javanese HIV patients with positive anti-Toxoplasma gondii IgM status. Since 2009 our research group performing a molecular epidemiology of blood borne viruses in Central Java Indonesia, by collecting the epidemiological and clinical data from the high risk communities. All blood samples were screened for blood borne pathogens by serological and molecular assays including for HIV and Toxoplasma gondii. The genomic DNA was isolated from the whole blood samples. Genetic polymorphisms of HLA-DQB1*0402 alleles were detected with polymerase chain reaction-sequence-specific primers (PCR-SSPs) technique. The genotypes were defined according to generated fragment patterns in the agarose gel electrophoresis analysis of PCR products. All of the samples were tested at least in duplicate. HLA-DQB1*0402 alleles were detected in 20.8% (16/77) patients and not detected in all HIV positive samples with negative anti-Toxoplasma gondii IgM status (n= 200). The HLA-DQB1*0402 alleles polymorphisms were detected in Javanese HIV patients with positive anti-Toxoplasma gondii IgM. The polymorphisms found may have association with the infection risk of Toxoplasma gondii in HIV patients.

  16. Clinical features of sarcoidosis in relation to HLA distribution and HLA-DRB3 genotyping by PCR-RFLP.

    OpenAIRE

    Ishihara, M; Ishida, T.; Mizuki, N; Inoko, H.; Ando, H; Ohno, S

    1995-01-01

    BACKGROUND--Susceptibility to the development of sarcoidosis has been demonstrated to be associated with HLA-DR5, -DR6, and -DR8 encoded by the DRB1 gene. However, involvement of the DRB3 (HLA-DR52) gene in the development of sarcoidosis remains unclear. METHODS--HLA-DRB3 genotyping was performed using the PCR-RFLP method and the clinical features of the patients with and without the DR3, 5, 6, 8 group antigens were compared. RESULTS--HLA-DRB3 genotyping indicated an association between DRB3*...

  17. HLA-B*57 Micropolymorphism shapes HLA allele-specific epitope immunogenicity, selection pressure, and HIV immune control

    DEFF Research Database (Denmark)

    Kløverpris, Henrik Nyhus; Buus, Anette Stryhn; van der Stok, Mary;

    2012-01-01

    because of their similar peptide-binding motifs and HIV disease outcome associations. However, we show here that the apparently small differences between HLA-B*57 alleles, termed HLA-B*57 micropolymorphisms, have a significant impact on immune control of HIV. In a study cohort of >2,000 HIV C......The genetic polymorphism that has the greatest impact on immune control of human immunodeficiency virus (HIV) infection is expression of HLA-B*57. Understanding of the mechanism for this strong effect remains incomplete. HLA-B*57 alleles and the closely related HLA-B*5801 are often grouped together......-clade-infected subjects from southern Africa, HLA-B*5703 is associated with a lower viral-load set point than HLA-B*5702 and HLA-B*5801 (medians, 5,980, 15,190, and 19,000 HIV copies/ml plasma; P = 0.24 and P = 0.0005). In order to better understand these observed differences in HLA-B*57/5801-mediated immune control...

  18. Influence of HLA-DRB1 and HLA-DQB1 alleles on IgG antibody response to the P. vivax MSP-1, MSP-3α and MSP-9 in individuals from Brazilian endemic area.

    Directory of Open Access Journals (Sweden)

    Josué C Lima-Junior

    Full Text Available BACKGROUND: The antibody response generated during malaria infections is of particular interest, since the production of specific IgG antibodies is required for acquisition of clinical immunity. However, variations in antibody responses could result from genetic polymorphism of the HLA class II genes. Given the increasing focus on the development of subunit vaccines, studies of the influence of class II alleles on the immune response in ethnically diverse populations is important, prior to the implementation of vaccine trials. METHODS AND FINDINGS: In this study, we evaluated the influence of HLA-DRB1* and -DQB1* allelic groups on the naturally acquired humoral response from Brazilian Amazon individuals (n = 276 against P. vivax Merozoite Surface Protein-1 (MSP-1, MSP-3α and MSP-9 recombinant proteins. Our results provide information concerning these three P. vivax antigens, relevant for their role as immunogenic surface proteins and vaccine candidates. Firstly, the studied population was heterogeneous presenting 13 HLA-DRB1* and 5 DQB1* allelic groups with a higher frequency of HLA-DRB1*04 and HLA-DQB1*03. The proteins studied were broadly immunogenic in a naturally exposed population with high frequency of IgG antibodies against PvMSP1-19 (86.7%, PvMSP-3 (77% and PvMSP-9 (76%. Moreover, HLA-DRB1*04 and HLA-DQB1*03 alleles were associated with a higher frequency of IgG immune responses against five out of nine antigens tested, while HLA-DRB1*01 was associated with a high frequency of non-responders to repetitive regions of PvMSP-9, and the DRB1*16 allelic group with the low frequency of responders to PvMSP3 full length recombinant protein. CONCLUSIONS: HLA-DRB1*04 alleles were associated with high frequency of antibody responses to five out of nine recombinant proteins tested in Rondonia State, Brazil. These features could increase the success rate of future clinical trials based on these vaccine candidates.

  19. Analysis of HLA-DP association with beryllium disease susceptibility in pooled exposed populations

    Energy Technology Data Exchange (ETDEWEB)

    Cesare Saltini, Massimo Amicosante

    2009-12-19

    in each immunogenetic study. In this context, the populations of the study already performed in this field by the University of Modena and Rome (by Prof. C. Saltini) and the University of Pennsylvania (by Prof. M. Rossman) have been evaluated by using similar HLA molecular typing methodologies and that both populations have now been followed up for a period of 4 to 7 years. The general objective of this study has to generate a larger data base comprising the two population with which analyze gene disease association with greater statistical power and ascertain the effect of lesser common gener variants which may be missed when analyzing associations on small populations. In particular addressing the role suggested in previous study such as: (1) the role of HLA-DP rare alleles and polymorphisms, and (2) the role of the HLA markers in disease progression from sensitization. The two populations from the already published studies (Saltini et al Eur Respir J. 2001 18:677-84; Rossman et al Am J Respir Crit Care Med. 2002 165:788-94) present similar aspects about: ethnicity, type and length of exposure to Be dust, a broadly similar association between beryllium related abnormalities and HLA. The two population have been pooled and evaluated using common criteria of diagnosis (Sensitized subject: at least 2 positive BeLPT tests each with 2 positive wells; CBD-affected subject: identification of well formed non-caseating granulomas on biopsy), follow up and HLA typing technique (complete HLA-DRB, DQB, DPB high resolution typing using amplification with sequence specific primers or sequence based typing). The two populations included 137 subjects with Beryllium hypersensitized (BH) and 155 Be-exposed controls. Inclusion criteria were met by one hundred and six subjects with Be-hypersensitivity of whom 55 were affected by CBD (age 52 {+-} 11 years; 50 caucasians, 2 African-Americans 2 Hispanics and 1 Asian; 46 males and 9 females; mean duration of Be-exposure 15 {+-} 9 years

  20. A qualitative inquiry of the financial concerns of couples opting to use preimplantation genetic diagnosis to prevent the transmission of known genetic disorders.

    Science.gov (United States)

    Drazba, Kathryn T; Kelley, Michele A; Hershberger, Patricia E

    2014-04-01

    Preimplantation genetic diagnosis (PGD) is an innovative prenatal testing option because the determination of whether a genetic disorder or chromosomal abnormality is evident occurs prior to pregnancy. However, PGD is not covered financially under the majority of private and public health insurance institutions in the United States, leaving couples to decide whether PGD is financially feasible. The aim of this qualitative study was to understand the role of finances in the decision-making process among couples who were actively considering PGD. In-depth, semi-structured interviews were completed with 18 genetic high-risk couples (36 individual partners). Grounded theory guided the analysis, whereby three themes emerged: 1) Cost is salient, 2) Emotions surrounding affordability, and 3) Financial burden and sacrifice. Ultimately, couples determined that the opportunity to avoid passing on a genetic disorder to a future child was paramount to the cost of PGD, but expressed financial concerns and recognized financial access as a major barrier to PGD utilization.

  1. HLA alleles may serve as a tool to discriminate atypical type 2 diabetic patients

    Institute of Scientific and Technical Information of China (English)

    Mariana; Fernández; Matías; Fabregat; Gerardo; Javiel; Adriana; Mimbacas

    2014-01-01

    AIM: To investigate whether the presence of human leukocyte antigen(HLA) marker could add new information to discriminated atypical diabetic type 2 patients.METHODS: We analyzed 199 patients initially diagnosed as type 2 diabetes who are treated in special care diabetes clinics(3rd level). This population was classified in "atypical"(sample A) and "classic"(sample B) according to HLA typing. We consider "classic patient" when has absence of type 1 diabetes associated HLA alleles and no difficulties in their diagnosis and treatments. By the other hand, we considered "atypical patient" when show type 1 diabetes associated HLA alleles and difficulties in their diagnosis and treatments. The standard protocol Asociacion Latinoamericana de Diabetes 2006 was used for patients follow up. To analyze differences between both populations in paraclinical parameters we used unpaired t tests and contingence tables. Bivariate and multivariate analyses were carried out using the SPSS software program. In all studies we assume differences statistically significant, with a P-value < 0.05 corrected and 95%CI.RESULTS: The typing HLA in the "atypical" populations show that 92.47% patients presented at list one type 1 diabetes associated HLA alleles(DQB1*0201-0302 and DR 3-4) and 7.53% had two of its. The results showed for categorical variables(family history, presence or absence of hypertension and/or dyslipidemia, reason for initial consultation) the only difference found was at dyslipidemia(OR = 0.45, 0.243 < OD < 0.822(P < 0.001). In relation to continuous variables we found significant differences between atypical vs classic only in cholesterol(5.07 ± 1.1 vs 5.56 ± 1.5, P < 0.05), high density lipoproteins(1.23 ± 0.3 vs 1.33 ± 0.3, P < 0.05) and low density lipoproteins(2.86 ± 0.9 vs 3.38 ± 1.7, P < 0.01). None of the variables had discriminating power when logistic regression was done.CONCLUSION: We propose an algorithm including HLA genotyping as a tool to discriminate

  2. HLA class II susceptibility pattern for type 1 diabetes (T1D) in an Iranian population.

    Science.gov (United States)

    Kiani, J; Hajilooi, M; Furst, D; Rezaei, H; Shahryari-Hesami, S; Kowsarifard, S; Zamani, A; Solgi, G

    2015-08-01

    This study aimed to determine the HLA-DRB1/HLA-DQB1 susceptibility and protection pattern for type 1 diabetes (T1D) in a population from Hamadan, north-west of Iran. A total of 133 patients with T1D were tested for HLA-DRB1 and HLA-DQB1 alleles using PCR-SSP compared to 100 ethnic-matched healthy controls. Alleles and haplotypes frequencies were compared between both groups. The most susceptible alleles for disease were HLA-DRB1*03:01, DRB1*04:02, DQB1*02:01 and DQB1*03:02, and protective alleles were HLA-DRB1*07:01, *11:01, *13:01, *14:01 and DRB1*15 and HLA-DQB1*06:01, *06:02 and *06:03. Haplotype analysis revealed that patients with T1D had higher frequencies of DRB1*03:01-DQB1*02:01 (OR = 4.86, P < 10(-7) ) and DRB1*04:02-DQB1*03:02 (OR = 9.93, P < 10(-7) ) and lower frequencies of DRB1*07:01-DQB1*02:01 (P = 0.0005), DRB1*11:01-DQB1*03:01 (P = 0.001), DRB1*13:01-DQB1*06:03 (P = 0.002) and DRB1*15-DQB1*06:01 (P = 0.001) haplotypes compared to healthy controls. Heterozygote combination of both susceptible haplotypes (DR3/DR4) confers the highest risk for T1D (RR = 18.80, P = 4 × 10(-5) ). Additionally, patients with homozygote diplotype, DR3/DR3 and DR4/DR4, showed a similar risk with less extent to heterozygote combination (P = 0.0004 and P = 0.01, respectively). Our findings not only confirm earlier reports from Iranians but also are in line with Caucasians and partly with Asians and some African patients with T1D. Remarkable differences were the identification of DRB1*04:01-DQB1*03:02, DRB1*07:01-DQB1*03:03 and DRB1*16-DQB1*05:02 as neutral and DRB1*13:01-DQB1*06:03 as the most protective haplotypes in this study.

  3. Structural analysis of the HLA-A/HLA-F subregion: Precise localization of two new multigene families closely associated with the HLA class I sequences

    Energy Technology Data Exchange (ETDEWEB)

    Pichon, L.; Carn, G.; Bouric, P. [CNRS, Rennes (France)] [and others

    1996-03-01

    Positional cloning strategies for the hemochromatosis gene have previously concentrated on a target area restricted to a maximum genomic expanse of 400 kb around the HLA-A and HLA-F loci. Recently, the candidate region has been extended to 2-3 Mb on the distal side of the MHC. In this study, 10 coding sequences [hemochromatosis candidate genes (HCG) I to X] were isolated by cDNA selection using YACs covering the HLA-A/HLA-F subregion. Two of these (HCG II and HCG IV) belong to multigene families, as well as other sequences already described in this region, i.e., P5, pMC 6.7, and HLA class I. Fingerprinting of the four YACSs overlapping the region was performed and allowed partial localization of the different multigene family sequences on each YAC without defining their exact positions. Fingerprinting on cosmids isolated from the ICRF chromosome 6-specific cosmid library allowed more precise localization of the redundant sequences in all of the multigene families and revealed their apparent organization in clusters. Further examination of these intertwined sequences demonstrated that this structural organization resulted from a succession of complex phenomena, including duplications and contractions. This study presents a precise description of the structural organization of the HLA-A/HLA-F region and a determination of the sequences involved in the megabase size polymorphism observed among the A3, A24, and A31 haplotypes. 29 refs., 2 figs., 2 tabs.

  4. Molecular genetics (HLA) of Behçet's disease.

    Science.gov (United States)

    Mizuki, N; Inoko, H; Ohno, S

    1997-12-01

    Behçet's disease (BD) has been known to be strongly associated with the human leukocyte antigen (HLA) B51. This B51 association has been confirmed in many different ethnic groups between the Middle East and Japan, and it has been proposed that BD is prevalent in those ethnic groups along the old Silk Route. The hypothesis could be made that B51 molecules are primarily involved in BD development through specific antigen presentation. However, polymorphic analyses of the TNFB gene and Tau-a microsatellite between the HLA-B and TNF genes indicate that the pathogenic gene of BD is not the HLA-B51 gene itself but another gene located around the HLA-B gene. HLA-C genotyping by the PCR-SSP method also suggests that the BD pathogenic gene is not the HLA-C gene itself but other gene located near the HLA-B gene. Recently we sequenced a single contig of 236,822 bp from the MICA gene (58.2 kb centromeric of HLA-B) to 90.8 kb telomeric of HLA-C and identified 8 novel genes designated NOB1-8 (NOB: new organization associated with HLA-B). During the course of the genomic sequence analysis we clarified the genetic structure of the MICA (MHC class I chain-related gene A) gene and found a triplet repeat microsatellite polymorphism of (GCT/AGC)n in the transmebrane (TM) region. Furthermore, the microsatellite allele consisting of 6 repetitions of GCT/AGC (MICA A6 allele) was present at a significantly higher frequency in the BD patient group than in the control group and a significant fraction of B51-negative patients were positive for this MICA A6 allele. These results suggest the possibility of a primary association of BD with MICA rather than HLA-B.

  5. m-Calpain is required for preimplantation embryonic development in mice

    Directory of Open Access Journals (Sweden)

    Williams Karen

    2006-01-01

    Full Text Available Abstract Background μ-calpain and m-calpain are ubiquitously expressed proteases implicated in cellular migration, cell cycle progression, degenerative processes and cell death. These heterodimeric enzymes are composed of distinct catalytic subunits, encoded by Capn1 (μ-calpain or Capn2 (m-calpain, and a common regulatory subunit encoded by Capn4. Disruption of the mouse Capn4 gene abolished both μ-calpain and m-calpain activity, and resulted in embryonic lethality, thereby suggesting essential roles for one or both of these enzymes during mammalian embryogenesis. Disruption of the Capn1 gene produced viable, fertile mice implying that either m-calpain could compensate for the loss of μ-calpain, or that the loss of m-calpain was responsible for death of Capn4-/- mice. Results To distinguish between the alternatives described above, we deleted an essential coding region in the mouse Capn2 gene in embryonic stems cells and transmitted this mutant allele through the mouse germline. Breeding of heterozygous animals failed to produce homozygous mutant live offspring or implanted embryos. A nested PCR genotyping protocol was established, and homozygous preimplantation mutant embryos were detected at the morula but not at the blastocyts stage. Conclusion We conclude that homozygous disruption of the Capn2 gene results in pre-implantation embryonic lethality between the morula and blastocyst stage. This establishes that μ-calpain and m-calpain have distinct functions, and that m-calpain is vital for development of the preimplantation murine embryo.

  6. Melatonin inhibits paraquat-induced cell death in bovine preimplantation embryos.

    Science.gov (United States)

    Pang, Yun-Wei; Sun, Ye-Qing; Sun, Wei-Jun; Du, Wei-Hua; Hao, Hai-Sheng; Zhao, Shan-Jiang; Zhu, Hua-Bin

    2016-03-01

    Preimplantation embryos are sensitive to oxidative stress-induced damage that can be caused by reactive oxygen species (ROS) originating from normal embryonic metabolism and/or the external surroundings. Paraquat (PQ), a commonly used pesticide and potent ROS generator, can induce embryotoxicity. The present study aimed to investigate the effects of melatonin on PQ-induced damage during embryonic development in bovine preimplantation embryos. PQ treatment significantly reduced the ability of bovine embryos to develop to the blastocyst stage, and the addition of melatonin markedly reversed the developmental failure caused by PQ (20.9% versus 14.3%). Apoptotic assay showed that melatonin pretreatment did not change the total cell number in blastocysts, but the incidence of apoptotic nuclei and the release of cytochrome c were significantly decreased. Using real-time quantitative polymerase chain reaction analysis, we found that melatonin pre-incubation significantly altered the expression levels of genes associated with redox signaling, particularly by attenuating the transcript level of Txnip and reinforcing the expression of Trx. Furthermore, melatonin pretreatment significantly reduced the expression of the pro-apoptotic caspase-3 and Bax, while the expression of the anti-apoptotic Bcl-2 and XIAP was unaffected. Western blot analysis showed that melatonin protected bovine embryos from PQ-induced damage in a p38-dependent manner, but extracellular signal-regulated kinase (ERK) and c-JUN N-terminal kinase (JNK) did not appear to be involved. Together, these results identify an underlying mechanism by which melatonin enhances the developmental potential of bovine preimplantation embryos under oxidative stress conditions.

  7. Association of HLA-DRB1 alleles and neuropsychological function in autism.

    Science.gov (United States)

    Chien, Yi-Ling; Wu, Yu-Yu; Chen, Chia-Hsiang; Gau, Susan Shur-Fen; Huang, Yu-Shu; Chien, Wei-Hsien; Hu, Fu-Chang; Chao, Yu-Lin

    2012-02-01

    Evidence suggests an association between autism and immune dysfunction. The associations between human lymphocyte antigen (HLA)-A2, B44, DRβ1*04 (DR4), C4B, and haplotype B44-SC30-DR4 and autism have been reported in western countries but there is a lack of such information in Asian population. This study aimed to assess the association between HLA-DRB1 allele frequencies and the clinical phenomenology of autism. The sample included 141 participants (male, 87.2%), who were diagnosed with autistic disorder based on clinical assessments and structured interviews using the Chinese version of the Autism Diagnostic Interview-Revised, and 156 healthy controls (male, 38.6%). The HLA-DRB1 alleles were determined by sequencing-based typing method. A subsample of patients (n=39) were assessed for intelligence and neuropsychological functions. The results showed that the pattern of DRB1 allele frequencies was significantly different between patients with autism and the controls (P=0.047). After adjusting for sex by haplotype regression, the frequencies of DR4, DR11, and DR14 were significantly different between patients with autism and healthy controls. In addition, patients with autism and DR4, DR11, or DR14 had different performance on intelligence and neuropsychology tests. Despite a relatively small sample size and a case-control association design, the findings suggest HLA-DRB1 gene might be associated with autism in Han Chinese. The true functional variants associated with autism in our samples remain to be further clarified. It warrants a replication study of a larger family sample and to validate the HLA genetic association with autism and its influence on neuropsychological function.

  8. Creatinine and cytokines plasma levels related to HLA compatibility in kidney transplant patients

    Directory of Open Access Journals (Sweden)

    Lorraine V. Alves

    2015-10-01

    Full Text Available ABSTRACTIntroduction:The success of kidney transplantation depends on prevention of organ rejection by the recipient’s immune system, which recognizes alloantigens present in transplanted tissue. Human leukocyte antigen (HLA typing is one of the tests used in pre-renal transplantation and represents one of the most important factors for a successful procedure.Objective:The present study evaluated creatinine and cytokines plasma levels in kidney transplant patients according to pre-transplant HLA typing.Methods:We assessed 40 renal transplanted patients selected in two transplant centers in Belo Horizonte (MG.Results:Patients were distributed into three groups according to HLA compatibility and, through statistical analysis, the group with more than three matches (H3 was found to have significantly lower post-transplant creatinine levels, compared to groups with three or fewer matches (H2 and H1, respectively. The median plasma levels of cytokines interleukin 6 (IL-6, tumor necrosis factor alpha (TNF-α, and interleukin 10 (IL-10 were evaluated according to the number of matches. Pro-inflammatory cytokines (IL-6 and TNF-α were significantly higher in groups with lower HLA compatibility. On the other hand, the regulatory cytokine IL-10 had significantly higher plasma levels in the group with greater compatibility between donor and recipient.Conclusion:These findings allow us to infer that pre-transplant HLA typing of donors and recipients can influence post-transplant renal graft function and may contribute to the development and choice of new treatment strategies.

  9. Association of HLA alleles with Plasmodium falciparum severity in Malian children.

    Science.gov (United States)

    Lyke, K E; Fernández-Viňa, M A; Cao, K; Hollenbach, J; Coulibaly, D; Kone, A K; Guindo, A; Burdett, L A; Hartzman, R J; Wahl, A R; Hildebrand, W H; Doumbo, O K; Plowe, C V; Sztein, M B

    2011-06-01

    Pre-erythrocytic immunity to Plasmodium falciparum malaria is likely to be mediated by T-cell recognition of malaria epitopes presented on infected host cells via class I and II major histocompatibility complex (MHC) antigens. To test for associations of human leukocyte antigen (HLA) alleles with disease severity, we performed high-resolution typing of HLA class I and II loci and compared the distributions of alleles of HLA-A, -B, -C and -DRB1 loci in 359 Malian children of Dogon ethnicity with uncomplicated or severe malaria. We observed that alleles A*30:01 and A*33:01 had higher frequency in the group of patients with cerebral disease compared to patients with uncomplicated disease [A*30:01: gf = 0.2031 vs gf = 0.1064, odds ratio (OR) = 3.17, P = 0.004, confidence interval (CI) (1.94-5.19)] and [A*33:01: gf = 0.0781 vs gf = 0.0266, 4.21, P = 0.005, CI (1.89-9.84)], respectively. The A*30:01 and A*33:01 alleles share some sequence motifs and A*30:01 appears to have a unique peptide binding repertoire compared to other A*30 group alleles. Computer algorithms predicted malaria peptides with strong binding affinity for HLA-A*30:01 and HLA-A*33:01 but not to closely related alleles. In conclusion, we identified A*30:01 and A*33:01 as potential susceptibility factors for cerebral malaria, providing further evidence that polymorphism of MHC genes results in altered malaria susceptibility. © 2011 John Wiley & Sons A/S.

  10. Expression of the CTCF gene in bovine oocytes and preimplantation embryos

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    Álvaro F.L. Rios

    2007-01-01

    Full Text Available The CCCTC - binding factor (CTCF is a protein involved in repression, activation, hormone-inducible gene silencing, functional reading of imprinted genes and X-chromosome inactivation. We analyzed CTCF gene expression in bovine peripheral blood, oocytes and in different cellular stages (2-4 cells, 8-16 cells, 16-32 cells, morulae, and blastocysts of in vitro fertilized embryos. This is the first report of CTCF expression in oocytes and preimplantation bovine embryos and has implications for the production of embryonic stem cells and the development of novel medical technologies for humans.

  11. Cell membrane and cell junctions in differentiation of preimplanted mouse embryos.

    Science.gov (United States)

    Izquierdo, L; Fernández, S; López, T

    1976-12-01

    Cell membrane and cell junctions in differentiation of preimplanted mouse embryos, (membrana celular y uniones celulares en la diferenciación del embrión de ratón antes de la implantación). Arch. Biol. Med. Exper. 10: 130-134, 1976. The development of cell junctions that seal the peripheral blastomeres could be a decisive step in the differentiation of morulae into blastocysts. The appearance of these junctions is studied by electron microscopy of late morulae and initial blastocysts. Zonulae occludentes as well as impermeability to lanthanum emulsion precedes the appearance of the blastocel and hence might be considered as one of its necessary causes.

  12. Amorphous clusters in Co implanted ZnO induced by boron pre-implantation

    Energy Technology Data Exchange (ETDEWEB)

    Potzger, K.; Shalimov, A.; Zhou, S.; Schmidt, H.; Mucklich, A.; Helm, M.; Fassbender, J.; Liberati, M.; Arenholz, E.

    2009-02-09

    We demonstrate the formation of superparamagnetic/ferromagnetic regions within ZnO(0001) single crystals sequently implanted with B and Co. While the pre-implantation with B plays a minor role for the electrical transport properties, its presence leads to the formation of amorphous phases. Moreover, B acts strongly reducing on the implanted Co. Thus, the origin of the ferromagnetic ordering in local clusters with large Co concentration is itinerant d-electrons as in the case of metallic Co. The metallic amorphous phases are non-detectable by common X-ray diffraction.

  13. SCREENING FOR A 21-CHROMOSOME ABNORMALITY IN PREIMPLANTED EMBRYOS OF ELDERLY WOMEN

    Institute of Scientific and Technical Information of China (English)

    Fang-yin Meng; Xiao-hong Li

    2004-01-01

    @@ Increasing maternal age is the only etiological factor unequivocally linked to Down's syndrome in humans. The occurrence rate of newborns with Down's syndrome is about 1/220 in women over 35 years old. However, the occurrence rate in embryos fertilized in vitro, of the elder woman is unclear. Using FISH we screened the number of chromosome 21 in preimplanted embryos of 5 elderly women (average age, 38.4 years) to study the feasibility and necessity of screening trisomy 21 in embryos in patients over 35 years old at the in vitro fertilization (IVF) center.

  14. Trim43a, Trim43b, and Trim43c: Novel mouse genes expressed specifically in mouse preimplantation embryos.

    Science.gov (United States)

    Stanghellini, Ilaria; Falco, Geppino; Lee, Sung-Lim; Monti, Manuela; Ko, Minoru S H

    2009-12-01

    We describe the identification and characterization of Trim43a, Trim43b, and Trim43c genes, whose expression are restricted to preimplantation stages and peak at the 8-cell to morula stage. We identified a 5kb DNA fragment that covers upstream region of Trim43a as a putative promoter, which can drive the expression of mStrawberry fluorescent protein in a manner similar to endogenous Trim43 genes. Trim43 genes will be useful stage-specific markers for the study of preimplantation embryos.

  15. Korean BAC library construction and characterization of HLA-DRA, HLA-DRB3.

    Science.gov (United States)

    Park, Mi-Hyun; Lee, Hye-Ja; Bok, Jeong; Kim, Cheol-Hwan; Hong, Seong-Tshool; Park, Chan; Kimm, KuChan; Oh, Bermseok; Lee, Jong-Young

    2006-07-31

    A human bacterial artificial chromosome (BAC) library was constructed with high molecular weight DNA extracted from the blood of a male Korean. This Korean BAC library contains 100,224 clones of insert size ranging from 70 to 150 kb, with an average size of 86 kb, corresponding to a 2.9-fold redundancy of the genome. The average insert size was determined from 288 randomly selected BAC clones that were well distributed among all the chromosomes. We developed a pooling system and three-step PCR screen for the Korean BAC library to isolate desired BAC clones, and we confirmed its utility using primer pairs designed for one of the clones. The Korean BAC library and screening pools will allow PCR-based screening of the Korean genome for any gene of interest. We also determined the allele types of HLA-DRA and HLA-DRB3 of clone KB55453, located in the HLA class II region on chromosome 6p21.3. The HLA-DRA and DRB3 genes in this clone were identified as the DRA*010202 and DRB3*01010201 types, respectively. The haplotype found in this library will provide useful information in future human disease studies.

  16. A novel HLA-Cw*01 variant allele, HLA-Cw*0130.

    Science.gov (United States)

    Deng, Z-H; Wang, D-M

    2009-12-01

    The novel HLA-Cw*0130 variant allele differs from the closest allele Cw*010201 by single nucleotide change at genomic nt 959 T>C (CDS nt 583 T>C, codon 171 TAC>CAC) in exon 3, which causes an amino acid change Tyr171His.

  17. Analysis of HLA-B15 and HLA-B27 in spondyloarthritis with peripheral and axial clinical patterns

    Science.gov (United States)

    Londono, John; Santos, Ana Maria; Peña, Paola; Calvo, Enrique; Espinosa, Luis R; Reveille, John D; Vargas-Alarcon, Gilberto; Jaramillo, Carlos A; Valle-Oñate, Rafael; Avila, Mabel; Romero, Consuelo; Medina, Juan F

    2015-01-01

    Objective Human leucocyte antigen (HLA) B27 and HLA-B15 are associated with spondyloarthritis (SpA). Recent Assessment of SpondyloArthritis international Society (ASAS) criteria emphasise a distinction between SpA with axial and peripheral patterns. We analysed whether HLA-A, HLA-B and HLA-DRB1 alleles could associate with these patterns. Methods We studied 100 healthy individuals and 178 patients with SpA according to European Spondyloarthropathy Study Group (ESSG) criteria. Patients were then classified according to ASAS criteria, the axial spondyloarthritis pattern (axSpA) being defined by ascertained sacroiliitis and the peripheral pattern (pSpA) by enthesitis and/or arthritis in extremities. A combined ax/p pattern was also considered. Results Only HLA-B27 and HLA-B15 alleles were associated with SpA. ASAS criteria for axSpA were met in 152 patients (12 with isolated axSpA and 140 with a combined ax/p patterns). When the ASAS peripheral criteria were applied, 161 patients met these criteria (13 with isolated pSpA and 148 with a combined ax/p pattern). HLA-B27 was found in 83% of patients with axSpA and 43% of ax/pSpA patients according to axASAS. HLA-B27 occurred in 7% controls but not in any patient with isolated pSpA. HLA-B15 was encountered in 31% of patients with isolated pSpA and 20% of ax/pSpA patients according to pASAS criteria. Moreover, 2 healthy controls, but none of our patients with isolated axSpA were positive for HLA-B15. Conclusions Our data suggest that the presence of HLA-B15 favours the development of isolated/combined peripheral rather than isolated axSpA, while HLA-B27 promotes an isolated/combined axial disease and excludes a peripheral pattern. HLA-B15 should be considered in addition to HLA-B27 when diagnosing patients with SpA according to ASAS criteria. PMID:26560062

  18. Vaccination and Infection as Causative Factors in Japanese Patients With Rasmussen Syndrome: Molecular Mimicry and HLA Class I

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    Yukitoshi Takahashi

    2006-01-01

    Full Text Available Rasmussen syndrome is an intractable epilepsy with a putative causal relation with cellular and humoral autoimmunity. Almost half of the patients have some preceding causative factors, with infections found in 38.2%, vaccinations in 5.9% and head trauma in 8.9% of Japanese patients. In a patient with seizure onset after influenza A infections, cross-reaction of the patient's lymphocytes with GluRε2 and influenza vaccine components was demonstrated by lymphocyte stimulation test. Database analyses revealed that influenza A virus hemagglutinin and GluRε2 molecules contain peptides with the patient's HLA class I binding motif (HLA ࢤ A*0201. The relative risks of HLA class I genotypes for Rasmussen syndrome are 6.1 (A*2402, 6.4 (A*0201, 6.3 (A*2601 and 11.4 (B*4601. The relative risks of HLA class I-A and B haplotypes are infinity (A*2601+B*5401, 21.1 (A*2402+B*1501, 13.3 (A*2402+B*4801 and 5.1 (A*2402+B*5201. Some alleles and haplotypes of HLA class I may be the risk factors in Japanese patients. Cross-reactivity of cytotoxic T lymphocytes may contribute to the processes leading from infection to the involvement of CNS.

  19. Evidence for HLA class II susceptible and protective haplotypes for osteomyelitis in pediatric patients with sickle cell anemia.

    Science.gov (United States)

    Al-Ola, K; Mahdi, N; Al-Subaie, A M; Ali, M E; Al-Absi, I K; Almawi, W Y

    2008-05-01

    We investigated the association of human leukocyte antigen (HLA) class II alleles and haplotypes with the pathogenesis of sickle cell anemia (SCA) osteomyelitis. SCA patients comprised 42 patients with osteomyelitis and 150 patients without osteomyelitis; HLA-DRB1* and HLA-DQB1* genotyping was performed by polymerase chain reaction-sequence-specific priming (SSP). DRB1*100101 (P value corrected for the number of different alleles tested, Pc=0.003) was positively associated with osteomyelitis. At the haplotype level, DRB1*100101-DQB1*050101 (Pc=0.001) was more prevalent among patients, while DRB1*030101-DQB1*0201 (Pc=0.020) and DRB1*040101-DQB1*0302 (Pc=0.039) were more prevalent among SCA controls, thereby conferring disease susceptibility or protection to these haplotypes, respectively. These results show that specific HLA haplotypes influence SCA osteomyelitis risk and that specific HLA types may serve as markers for identifying SCA patients at high risk for osteomyelitis.

  20. Identification of a novel conserved HLA-A*0201-restricted epitope from the spike protein of SARS-CoV

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    Ni Bing

    2009-12-01

    Full Text Available Abstract Background The spike (S protein is a major structural glycoprotein of coronavirus (CoV, the causal agent of severe acute respiratory syndrome (SARS. The S protein is a potent target for SARS-specific cell-mediated immune responses. However, the mechanism CoV pathogenesis in SARS and the role of special CTLs in virus clearance are still largely uncharacterized. Here, we describe a study that leads to the identification of a novel HLA-A*0201-restricted epitope from conserved regions of S protein. Results First, different SARS-CoV sequences were analyzed to predict eight candidate peptides from conserved regions of the S protein based upon HLA-A*0201 binding and proteosomal cleavage. Four of eight candidate peptides were tested by HLA-A*0201 binding assays. Among the four candidate peptides, Sp8 (S958-966, VLNDILSRL induced specific CTLs both ex vivo in PBLs of healthy HLA-A2+ donors and in HLA-A2.1/Kb transgenic mice immunized with a plasmid encoding full-length S protein. The immunized mice released IFN-γ and lysed target cells upon stimulation with Sp8 peptide-pulsed autologous dendritic cells in comparison to other candidates. Conclusion These results suggest that Sp8 is a naturally processed epitope. We propose that Sp8 epitope should help in the characterization of mechanisms of virus control and immunopathology in SARS-CoV infection.

  1. New Developments in HLA-G in Cardiac Transplantation.

    Science.gov (United States)

    Lazarte, Julieta; Tumiati, Laura C; Rao, Vivek; Delgado, Diego H

    2016-09-01

    Human Leukocyte Antigen-G (HLA-G) is a non-classical class 1b protein, whose gene is located on chromosome 6 (6p21.31). HLA-G inhibits the immune cells' cytotoxic activity by interacting with specific receptors on their membranes. Since it is a naturally occurring immune modulator, HLA-G has been investigated in transplantation. Indeed, a number of investigations reveal that HLA-G expression is influenced by genetic polymorphisms and in turn, those polymorphisms are associated with detrimental or beneficial outcomes in various pathological situations. The present review introduces the HLA-G molecule, the gene and its polymorphisms. It focuses on the expression of HLA-G and the role of polymorphisms primarily in heart transplant outcomes, secondarily in other transplant organs, as well as the role of the allograft and effect of medical therapy. We discuss the limitations in HLA-G transplant investigations and future directions. The immune inhibiting activity of HLA-G has a great deal of potential for its utilization in enhancing diagnostic, preventive and therapeutic strategies against rejection in the setting of transplantation. Copyright © 2015 American Society for Histocompatibility and Immunogenetics. Published by Elsevier Inc. All rights reserved.

  2. The role of HLA-E polymorphism in immunological response

    Directory of Open Access Journals (Sweden)

    Milena Iwaszko

    2011-09-01

    Full Text Available The HLA-E protein is one of the most extensively studied MHC class Ib antigens and the least polymorphic one compared to other MHC class I molecules. In the human population there have been reported just ten alleles encoding three different peptides. Only two of these alleles, namely HLA-E*0101 and HLA-E*0103, are widely distributed (around 50�0each. The proteins encoded by these alleles differ from each other in one amino acid at position 107. In HLA-E*0101 it is arginine and in HLA-E*0103 it is glycine. The difference between these proteins manifests itself in surface expression levels, affinities to leader peptides and thermal stabilities of their complexes.The HLA-E molecule is a ligand for CD94/NKG2 receptors on NK cells and TCR receptors on NK-CTL (NK-cytotoxic T lymphocyte cells, so it plays a double role in both innate and adaptive immunity. This paper reviews the knowledge on the role of the HLA-E molecule in the immunological response. Aspects related to polymorphism of the HLA-E gene and the course of several diseases including type I diabetes, ankylosing spondylitis, HCV and HIV infections, nasopharyngeal cancer and recurrent spontaneous abortions, as well as the outcome of hematopoietic stem cell transplantation, are presented and discussed in more detail.

  3. HLA-Modeler: Automated Homology Modeling of Human Leukocyte Antigens

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    Shinji Amari

    2013-01-01

    Full Text Available The three-dimensional (3D structures of human leukocyte antigen (HLA molecules are indispensable for the studies on the functions at molecular level. We have developed a homology modeling system named HLA-modeler specialized in the HLA molecules. Segment matching algorithm is employed for modeling and the optimization of the model is carried out by use of the PFROSST force field considering the implicit solvent model. In order to efficiently construct the homology models, HLA-modeler uses a local database of the 3D structures of HLA molecules. The structure of the antigenic peptide-binding site is important for the function and the 3D structure is highly conserved between various alleles. HLA-modeler optimizes the use of this structural motif. The leave-one-out cross-validation using the crystal structures of class I and class II HLA molecules has demonstrated that the rmsds of nonhydrogen atoms of the sites between homology models and crystal structures are less than 1.0 Å in most cases. The results have indicated that the 3D structures of the antigenic peptide-binding sites can be reproduced by HLA-modeler at the level almost corresponding to the crystal structures.

  4. HLA-Modeler: Automated Homology Modeling of Human Leukocyte Antigens.

    Science.gov (United States)

    Amari, Shinji; Kataoka, Ryoichi; Ikegami, Takashi; Hirayama, Noriaki

    2013-01-01

    The three-dimensional (3D) structures of human leukocyte antigen (HLA) molecules are indispensable for the studies on the functions at molecular level. We have developed a homology modeling system named HLA-modeler specialized in the HLA molecules. Segment matching algorithm is employed for modeling and the optimization of the model is carried out by use of the PFROSST force field considering the implicit solvent model. In order to efficiently construct the homology models, HLA-modeler uses a local database of the 3D structures of HLA molecules. The structure of the antigenic peptide-binding site is important for the function and the 3D structure is highly conserved between various alleles. HLA-modeler optimizes the use of this structural motif. The leave-one-out cross-validation using the crystal structures of class I and class II HLA molecules has demonstrated that the rmsds of nonhydrogen atoms of the sites between homology models and crystal structures are less than 1.0 Å in most cases. The results have indicated that the 3D structures of the antigenic peptide-binding sites can be reproduced by HLA-modeler at the level almost corresponding to the crystal structures.

  5. Criteria to define HLA haplotype loss in human solid tumors

    NARCIS (Netherlands)

    Ramal, LM; van der Zwan, AW; Collado, A; Lopez-Nevot, MA; Tilanus, M; Garrido, F

    2000-01-01

    Short tandem repeat (STR) markers are currently used to define loss of heterozygosity (LOH) of genes and chromosomes in tumors. Chromosome 6 and chromosome 15 STR markers are applied to define loss of HLA and related genes (e.g. TAP and beta(2)m) The number of STR identified in the HLA region is sti

  6. Ultraspecific probes for high throughput HLA typing

    Directory of Open Access Journals (Sweden)

    Eggers Rick

    2009-02-01

    Full Text Available Abstract Background The variations within an individual's HLA (Human Leukocyte Antigen genes have been linked to many immunological events, e.g. susceptibility to disease, response to vaccines, and the success of blood, tissue, and organ transplants. Although the microarray format has the potential to achieve high-resolution typing, this has yet to be attained due to inefficiencies of current probe design strategies. Results We present a novel three-step approach for the design of high-throughput microarray assays for HLA typing. This approach first selects sequences containing the SNPs present in all alleles of the locus of interest and next calculates the number of base changes necessary to convert a candidate probe sequences to the closest subsequence within the set of sequences that are likely to be present in the sample including the remainder of the human genome in order to identify those candidate probes which are "ultraspecific" for the allele of interest. Due to the high specificity of these sequences, it is possible that preliminary steps such as PCR amplification are no longer necessary. Lastly, the minimum number of these ultraspecific probes is selected such that the highest resolution typing can be achieved for the minimal cost of production. As an example, an array was designed and in silico results were obtained for typing of the HLA-B locus. Conclusion The assay presented here provides a higher resolution than has previously been developed and includes more alleles than previously considered. Based upon the in silico and preliminary experimental results, we believe that the proposed approach can be readily applied to any highly polymorphic gene system.

  7. A Large-Scale Genetic Analysis Reveals a Strong Contribution of the HLA Class II Region to Giant Cell Arteritis Susceptibility

    Science.gov (United States)

    Carmona, F. David; Mackie, Sarah L.; Martín, Jose-Ezequiel; Taylor, John C.; Vaglio, Augusto; Eyre, Stephen; Bossini-Castillo, Lara; Castañeda, Santos; Cid, Maria C.; Hernández-Rodríguez, José; Prieto-González, Sergio; Solans, Roser; Ramentol-Sintas, Marc; González-Escribano, M. Francisca; Ortiz-Fernández, Lourdes; Morado, Inmaculada C.; Narváez, Javier; Miranda-Filloy, José A.; Martínez-Berriochoa, Agustín; Unzurrunzaga, Ainhoa; Hidalgo-Conde, Ana; Madroñero-Vuelta, Ana B.; Fernández-Nebro, Antonio; Ordóñez-Cañizares, M. Carmen; Escalante, Begoña; Marí-Alfonso, Begoña; Sopeña, Bernardo; Magro, César; Raya, Enrique; Grau, Elena; Román, José A.; de Miguel, Eugenio; López-Longo, F. Javier; Martínez, Lina; Gómez-Vaquero, Carmen; Fernández-Gutiérrez, Benjamín; Rodríguez-Rodríguez, Luis; Díaz-López, J. Bernardino; Caminal-Montero, Luis; Martínez-Zapico, Aleida; Monfort, Jordi; Tío, Laura; Sánchez-Martín, Julio; Alegre-Sancho, Juan J.; Sáez-Comet, Luis; Pérez-Conesa, Mercedes; Corbera-Bellalta, Marc; García-Villanueva, M. Jesús; Fernández-Contreras, M. Encarnación; Sanchez-Pernaute, Olga; Blanco, Ricardo; Ortego-Centeno, Norberto; Ríos-Fernández, Raquel; Callejas, José L.; Fanlo-Mateo, Patricia; Martínez-Taboada, Víctor M.; Beretta, Lorenzo; Lunardi, Claudio; Cimmino, Marco A.; Gianfreda, Davide; Santilli, Daniele; Ramirez, Giuseppe A.; Soriano, Alessandra; Muratore, Francesco; Pazzola, Giulia; Addimanda, Olga; Wijmenga, Cisca; Witte, Torsten; Schirmer, Jan H.; Moosig, Frank; Schönau, Verena; Franke, Andre; Palm, Øyvind; Molberg, Øyvind; Diamantopoulos, Andreas P.; Carette, Simon; Cuthbertson, David; Forbess, Lindsy J.; Hoffman, Gary S.; Khalidi, Nader A.; Koening, Curry L.; Langford, Carol A.; McAlear, Carol A.; Moreland, Larry; Monach, Paul A.; Pagnoux, Christian; Seo, Philip; Spiera, Robert; Sreih, Antoine G.; Warrington, Kenneth J.; Ytterberg, Steven R.; Gregersen, Peter K.; Pease, Colin T.; Gough, Andrew; Green, Michael; Hordon, Lesley; Jarrett, Stephen; Watts, Richard; Levy, Sarah; Patel, Yusuf; Kamath, Sanjeet; Dasgupta, Bhaskar; Worthington, Jane; Koeleman, Bobby P.C.; de Bakker, Paul I.W.; Barrett, Jennifer H.; Salvarani, Carlo; Merkel, Peter A.; González-Gay, Miguel A.; Morgan, Ann W.; Martín, Javier

    2015-01-01

    We conducted a large-scale genetic analysis on giant cell arteritis (GCA), a polygenic immune-mediated vasculitis. A case-control cohort, comprising 1,651 case subjects with GCA and 15,306 unrelated control subjects from six different countries of European ancestry, was genotyped by the Immunochip array. We also imputed HLA data with a previously validated imputation method to perform a more comprehensive analysis of this genomic region. The strongest association signals were observed in the HLA region, with rs477515 representing the highest peak (p = 4.05 × 10−40, OR = 1.73). A multivariate model including class II amino acids of HLA-DRβ1 and HLA-DQα1 and one class I amino acid of HLA-B explained most of the HLA association with GCA, consistent with previously reported associations of classical HLA alleles like HLA-DRB1∗04. An omnibus test on polymorphic amino acid positions highlighted DRβ1 13 (p = 4.08 × 10−43) and HLA-DQα1 47 (p = 4.02 × 10−46), 56, and 76 (both p = 1.84 × 10−45) as relevant positions for disease susceptibility. Outside the HLA region, the most significant loci included PTPN22 (rs2476601, p = 1.73 × 10−6, OR = 1.38), LRRC32 (rs10160518, p = 4.39 × 10−6, OR = 1.20), and REL (rs115674477, p = 1.10 × 10−5, OR = 1.63). Our study provides evidence of a strong contribution of HLA class I and II molecules to susceptibility to GCA. In the non-HLA region, we confirmed a key role for the functional PTPN22 rs2476601 variant and proposed other putative risk loci for GCA involved in Th1, Th17, and Treg cell function. PMID:25817017

  8. Polymorphisms of HLA genes in Western Javanese (Indonesia): close affinities to Southeast Asian populations.

    Science.gov (United States)

    Yuliwulandari, R; Kashiwase, K; Nakajima, H; Uddin, J; Susmiarsih, T P; Sofro, A S M; Tokunaga, K

    2009-01-01

    Identification of human leukocyte antigen (HLA) antigens that are known as the highest polymorphic genes has become a valuable tool for tissue transplantation, platelet transfusion, disease susceptibility or resistance, and forensic and anthropological studies. In the present study, the allele and haplotype frequencies of HLA-A, HLA-B, and HLA-DRB1 were studied in 237 unrelated healthy Western Javanese (Indonesia) by the high-resolution polymerase chain reaction-Luminex method. A total of 18 A, 40 B, and 20 DRB1 alleles were identified. The most frequent HLA-A, -B, and -DRB1 alleles were HLA-A*2407 (21.6%), HLA-B*1502 (11.6%) and HLA-B*1513 (11.2%), and DRB1*1202 (37.8%), respectively. The most frequent two-locus haplotypes were HLA-A*2407-B*3505 (7%) and HLA-B*1513-DRB1*1202 (9.2%), and three-locus haplotypes were HLA-A*3401-B*1521-DRB1*150201 (4.6%), HLA-A*2407-B*3505-DRB1*1202 (4.3%), and HLA-A*330301-B*440302-DRB1*070101 (4.2%). HLA allele and haplotype frequencies in addition to phylogenetic tree and principal component analyses based on the four-digit sequence-level allele frequencies for HLA-A, HLA-B, and HLA-DRB1 showed that Western Javanese (Indonesia) was closest to Southeast Asian populations.

  9. Role of HLA-A in Handedness

    OpenAIRE

    2015-01-01

    AbstractA relationship exists between cerebral dominance and right or left handedness. Left-hemisphere dominance occurs in 97% of right-handed people and in 70% of left-handed people. The other 30% of left-handed individuals have anomalous or right-hemisphere dominance. Both environmental and genetic factors have been proposed to explain the human handedness. Aim of this study was to determine the effect of genetic factor of human leukocytes antigens (HLA-A) on development of left handedness....

  10. Reverse immunogenetics: from HLA-disease associations to vaccine candidates.

    Science.gov (United States)

    Davenport, M P; Hill, A V

    1996-01-01

    Analysis of the human leukocyte antigens (HLA) in patients with either infectious or autoimmune diseases has led to the identification of several HLA alleles associated with either resistance or susceptibility to disease. Understanding the role of HLA molecules in the presentation of peptide antigens to T cells has led to the use of 'reverse immunogenetics': a novel approach to analysing the key antigenic peptides that are presented by the relevant HLA molecules. Recent advances in the analysis of naturally occurring peptides bound to HLA molecules has allowed the direct identification of antigenic peptides from living cells and has supported the development of vaccine candidates, such as the liver-stage antigen 1 in malaria.

  11. The interaction between smoking and HLA genes in multiple sclerosis

    DEFF Research Database (Denmark)

    Hedström, Anna Karin; Katsoulis, Michail; Hössjer, Ola

    2017-01-01

    Interactions between environment and genetics may contribute to multiple sclerosis (MS) development. We investigated whether the previously observed interaction between smoking and HLA genotype in the Swedish population could be replicated, refined and extended to include other populations. We used...... populations from the Nordic studies (6265 cases, 8401 controls). In both the pooled analyses and in the combined Nordic material, interactions were observed between HLA-DRB*15 and absence of HLA-A*02 and between smoking and each of the genetic risk factors. Two way interactions were observed between each...... with never smokers without these genetic risk factors (OR 12.7, 95% CI 10.8-14.9). The risk of MS associated with HLA genotypes is strongly influenced by smoking status and vice versa. Since the function of HLA molecules is to present peptide antigens to T cells, the demonstrated interactions strongly...

  12. HLA-G expression in the peripheral blood of live kidney transplant recipients

    Institute of Scientific and Technical Information of China (English)

    XIAO Li; ZHOU Wen-qiang; SHI Bing-yi; FENG Kai; HE Xiu-yun; WEI Yu-xiang; GAO Yu

    2013-01-01

    Background The human leukocyte antigen-G (HLA-G) has been considered to be an important tolerogeneic molecule playing an essential role in maternal-fetal tolerance,upregulated in the context of transplantation,malignancy,and inflammation,and has been correlated with various clinical outcomes.The aim of this study was to investigate the clinical relevance of the expression of membrane HLA-G (mHLA-G),intracellular HLA-G (iHLA-G),and soluble HLA-G (sHLA-G) in the peripheral blood of live kidney transplant recipients.Methods We compared the expression of the three HLA-G isoforms in three groups,healthy donors (n=20),recipients with acute rejection (n=19),and functioning transplants (n=30).Flow cytometry was used to detect the expression of mHLA-G and iHLA-G in the T lymphocytes of peripheral blood from subjects in the three groups.Enzyme-linked immunosorbent assays were used to detect sHLA-G in the plasma from the three groups.Results There were no significant differences in mHLA-G and intracellular HLA-G among the three groups,but the sHLA-G plasma level was higher in the functioning group than in the acute rejection or healthy group.We found a subset of CD4+HLA-G+ and CD8+HLA-G+T lymphocytes with low rates of mHLA-G expression in the peripheral blood of kidney transplantation recipients.Intracellular expression of HLA-G was detected in T lymphocytes.However,there was no correlation between acute rejection and the mHLA-G or intracellular HLA-G expression.Conclusion sHLA-G was the major isoform in the peripheral blood of live kidney transplant recipients and high sHLA-G levels were associated with allograft acceptance.

  13. Expression of the Classical and Nonclassical HLA Molecules in Breast Cancer

    Directory of Open Access Journals (Sweden)

    Gisela Bevilacqua Rolfsen Ferreira da Silva

    2013-01-01

    Full Text Available Considering that downregulation of HLA expression could represent a potential mechanism for breast carcinogenesis and metastasis, the aim of the present study was to use immunohistochemical methods to analyze the expression of HLA-Ia, HLA-DR, HLA-DQ, HLA-E, and HLA-G in invasive ductal carcinoma (IDC of the breast and to relate this HLA profile to anatomopathological parameters. Fifty-two IDC from breast biopsies were stratified according to histological differentiation (well, moderately, and poorly differentiated and to the presence of metastases in axillary lymph nodes. The expression of HLA molecules was assessed by immunohistochemistry, using a computer-assisted system. Overall, 31 (59.6% out of the 52 IDC breast biopsies exhibited high expression of HLA-G, but only 14 (26.9% showed high expression of HLA-E. A large number (41, 78.8% of the biopsies showed low expression of HLA-Ia, while 45 (86.5% showed high expression of HLA-DQ and 36 (69.2% underexpressed HLA-DR. Moreover, 24 (41.2% of 52 biopsies had both low HLA-Ia expression and high HLA-G expression, while 11 (21.2% had low HLA-Ia expression and high HLA-E expression. These results suggest that, by different mechanisms, the downregulation of HLA-Ia, HLA-E, and HLA-DR and the upregulation of HLA-G and HLA-DQ are associated with immune response evasion and breast cancer aggressiveness.

  14. Association of HLA-DQ gene with bowel transit, barrier function, and inflammation in irritable bowel syndrome with diarrhea.

    Science.gov (United States)

    Vazquez-Roque, Maria I; Camilleri, Michael; Smyrk, Thomas; Murray, Joseph A; O'Neill, Jessica; Carlson, Paula; Lamsam, Jesse; Eckert, Deborah; Janzow, Denise; Burton, Duane; Ryks, Michael; Rhoten, Deborah; Zinsmeister, Alan R

    2012-12-01

    Patients with irritable bowel syndrome (IBS) with diarrhea (IBS-D) carrying human leukocyte antigen (HLA)-DQ2/8 genotypes benefit from gluten withdrawal. Our objective was to compare gastrointestinal barrier function, mucosal inflammation, and transit in nonceliac IBS-D patients and assess association with HLA-DQ2/8 status. In 45 IBS-D patients who were naive to prior exclusion of dietary gluten, we measured small bowel (SB) and colonic mucosal permeability by cumulative urinary lactulose and mannitol excretion (0-2 h for SB and 8-24 h for colon), inflammation on duodenal and rectosigmoid mucosal biopsies (obtained in 28 of 45 patients), tight junction (TJ) protein mRNA and protein expression in SB and rectosigmoid mucosa, and gastrointestinal and colonic transit by validated scintigraphy. SB mucosal biopsies were stained with hematoxylin-eosin to assess villi and intraepithelial lymphocytes, and immunohistochemistry was used to assess CD3, CD8, tryptase, and zonula occludens 1 (ZO-1); colonic biopsy intraepithelial lymphocytes were quantitated. Associations of HLA-DQ were assessed using Wilcoxon's rank-sum test. Relative to healthy control data, we observed a significant increase in SB permeability (P colonic permeability (P = 0.10), and a decrease in TJ mRNA expression in rectosigmoid mucosa in IBS-D. In HLA-DQ2/8-positive patients, ZO-1 protein expression in the rectosigmoid mucosa was reduced compared with that in HLA-DQ2/8-negative patients and colonic transit was slower than in HLA-DQ2/8-negative patients. No other associations with HLA genotype were identified. There is abnormal barrier function (increased SB permeability and reduced mRNA expression of TJ proteins) in IBS-D relative to health that may be, in part, related to immunogenotype, given reduced ZO-1 protein expression in rectosigmoid mucosa in HLA-DQ2/8-positive relative to HLA-DQ2/8-negative patients.

  15. Differential diagnosis of juvenile ankylosing spondylitis and juvenile rheumatoid arthritis by subtypes of HLA-B27 alleles%少儿强直性脊柱炎与幼儿类风湿性关节炎HLA-B27亚型的鉴别诊断

    Institute of Scientific and Technical Information of China (English)

    林琳; 吴凤歧; 张新根; 刘雅琴; 王江

    2004-01-01

    the relationship of JAS and JRA with HLA-B27 allele subtypes and its role in the pathogenesis so as to find out the testing methods for earlier diagnosis of JAS or JRA. DESIGN:Non-random control laboratory study. SETTING,PARTICIPANTS and INTERVENTLONS:A total of 60 patients diagnosed with JAS or JRA in Beijing Children's Hospital were recruited,including 5 fathers or mothers from 5 patients' families, compared with 9 normal controls(from 200 donors for bone marrow transplantation).We studied 74 cases of HLA-B27 allele subtypes and analyzed their correlation by using PCR/SSP. MAIN OUTCOME MEASURES:Correlation of JAS and JRA with HLA-B27 allele subtypes; difference of HLA-B 2704 between JAS and JRA; data of patients' families.Haplotypes analysis and homozygote analysis on patients' families showed that there existed a close link between HLA-B* 2704 and C* 1202,but not with HLA-A,and that JAS had a remarkable tendency of family inheritance.RESULTS:HLA-B* 2704, * 2705, * 2702 and * 2707 were found in the cases.In JAS group, allelic frequency of HLA-B27 was B* 2704 56.25% , B* 2705 40.63% and B* 2702 3.13% ,respectively.However,in JRA group,it was B* 2705 60.7% ,B* 2704 28.57% ,B* 2702 3.57% and B* 2707 7.14%,respectively.Comparison between JAS and JRA showed that the allelic frequency of HLA-B* 2704 in JAS patients was higher than that in JAS patients(RR=3.21,P< 0.05). CONCLUSION:The susceptibility of JAS is positively associated with subtypes HLA-B* 2704.Testing HLA-B27 subtypes may be a valuable marker in differential diagnosis of JAS and JRA.

  16. [HLA B13, B17, B37 and Cw6 in psoriasis vulgaris: relationship to age of onset (author's transl)].

    Science.gov (United States)

    Mayr, W R; Gschnait, F; Brenner, W

    1979-03-01

    The frequency of HLA B13, B17, B37 and Cw6 was investigated in 77 patients with psoriasis vulgaris (57 patients with an onset of the disease between 10 and 20 years of age and 20 patients with an onset between 35 and 45 years). A highly significant increase in the frequency of the four HLA antigens tested was found. The highest relative risk was calculated for Cw6 (RR = 8.28). Furthermore, a significant positive association was observed between the presence of Cw6 and an early onset of psoriasis vulgaris.

  17. Study of HLA-DR synthesis in cultured human keratinocytes.

    Science.gov (United States)

    Wikner, N E; Huff, J C; Norris, D A; Boyce, S T; Cary, M; Kissinger, M; Weston, W L

    1986-11-01

    Within the normal human epidermis only Langerhans and indeterminate cells express HLA-DR. Human keratinocytes (HK), however, may also express HLA-DR in certain disease states characterized by mononuclear cell infiltrates. Previous studies have shown that HK synthesize HLA-DR in response to stimulation by interferon gamma (INF-gamma). The purposes of this study were to define conditions under which cultured HK might express HLA-DR and to compare the HLA-DR synthesis of HK with that of monocytes. HLA-DR expression by HK as determined by indirect immunofluorescence of HK cultures was absent under standard low calcium conditions and remained absent with the addition of calcium, serum, mitogens, and supernatants from Pam-212 cells containing epidermal thymocyte-activating factor. HLA-DR expression in HK was induced by cocultivation with concanavalin A-stimulated peripheral blood mononuclear cells (PBMC), but not unstimulated PBMC. This effect was time-dependent and directly related to the number of PBMC. HLA-DR expression was also induced in a time- and dose-dependent manner by addition of supernatant from stimulated PBMC (SS) or by addition of recombinant INF-gamma but not by addition of interleukin (IL)-1 or IL-2. Induction by either SS or INF-gamma was blocked by an antiserum to INF-gamma. As determined by a semiquantitative immunoprecipitation technique, HLA-DR synthesis by HK was directly related to INF-gamma concentration. The pattern of HLA-DR peptides produced by HK was similar to that of monocytes, but the relative quantity synthesized was far less than that of monocytes.

  18. Histoblood groups other than HLA in organ transplantation.

    Science.gov (United States)

    Nydegger, U E; Riedler, G F; Flegel, W A

    2007-01-01

    Immunological matching of a living related donor and recipient of an allograft is precise, but for cadaver organs matching is controversial, including at least detection of specific sensitization in the recipient against the donor, especially for HLA-DR. With the publication of some cases of ABO histoblood group incompatible transplantations with favorable outcomes, transplantation immunologists now focus on many of the 29 International Society of Blood Transfusion-approved histoblood group systems. So far, research lags behind knowledge about which system occurs in which organ, but modern molecular biology tests, like basic local alignment search tools (BLAST) and the recent inclusion of some systems into the CD classification, make possible the tracking of some histoblood group epitopes to specific tissue components. We have conducted such a search. With respect to tissue distribution, mRNA transcripts, and expressed sequence tags (EST), we observed a huge variety of distribution patterns. The total number of EST in the embryo pool was 752,991 and in the adult pool 1,227,835. Representative results were described for umbilical cord, bone marrow, peripheral stem cells, the nervous system, and the embryo. The ABO histoblood group systems maintain high priority for matching, because of the occurrence of naturally occurring anti-A/B antibodies. Substantial progress has been made in monitoring their levels and immunoglobulin isotypes in recipients, which, beyond hemagglutination, can now be quantitated using ELISA or cytofluorometry. A picture of ever-improving compatibility matching in solid organ and stem cell transplantation beyond mere HLA typing is the consequence.

  19. Human Leukocyte Antigen (HLA) Class I Restricted Epitope Discovery in Yellow Fewer and Dengue Viruses: Importance of HLA Binding Strength

    DEFF Research Database (Denmark)

    Lund, Ole; Nascimento, Eduardo J. M.; Maciel, Milton, Jr

    2011-01-01

    Epitopes from all available full-length sequences of yellow fever virus (YFV) and dengue fever virus (DENV) restricted by Human Leukocyte Antigen class I (HLA-I) alleles covering 12 HLA-I supertypes were predicted using the NetCTL algorithm. A subset of 179 predicted YFV and 158 predicted DENV...

  20. Antigen presenting cells costimulatory signaling during pre-implantation pregnancy 

    Directory of Open Access Journals (Sweden)

    Anna Sławek

    2012-09-01

    Full Text Available  Success of pregnancy depends on many factors. Three phenomena inducing immune tolerance against semi-allogeneic conceptus may play a crucial role in the pre-implantation period of pregnancy: influence of sex hormones in sex cycle, presence of oocyte or embryo and the presence of semen in the female reproductive tract. On the other hand dendritic cells are the most effective antigen-presenting cells in regulation of immune phenomena and also are considered as potent participants in inducing immune tolerance in the pregnancy. They communicate with T cells in cell contact-dependent manner or via cytokines. During cell-cell contacts, costimulatory molecules play a key role and their expression is often dependent on cytokines milieu. Both costimulatory molecules and cytokines influence generation of T regulatory cells. Interactions of these molecules are closely related. In this paper we would like to pay attention to the importance of antigen presenting cells costimulatory potency in immune regulation during a pre-implantation period of pregnancy.

  1. Effects of growth hormone on the ultrastructure of bovine preimplantation embryos.

    Science.gov (United States)

    Kölle, Sabine; Stojkovic, Miodrag; Reese, Sven; Reichenbach, Horst-Dieter; Wolf, Eckhard; Sinowatz, Fred

    2004-07-01

    Growth hormone (GH) has recently been shown to promote the development of preimplantation embryos. The aim of our study was therefore to analyze the effects of GH on the morphology and ultrastructure of the cells of bovine preimplantation embryos produced by in vitro fertilization (IVF). In order to determine the physiologically optimal morphology of blastocysts, ex vivo embryos obtained by uterine flushing were also included in the study. As shown by transmission electron microscopy, treatment with GH induced the elimination of glycogen storage in cells of the inner cell mass of 7-day-old embryos. GH also stimulated the exocytosis of lipid vesicles in the inner cell mass and trophectoderm cells of these embryos. Quantitative analysis of micrographs demonstrated a higher volume density of embryonic mitochondria in 7-day-old embryos cultured with GH than in control embryos. Treatment with GH regularly resulted in an improvement of the ultrastructural features of embryos produced in vitro, thus resembling the morphology of ex vivo embryos. Scanning electron-microscopy studies demonstrated that GH altered the structure and the pore size of the zona pellucida of blastocysts. Our studies imply that GH can modulate carbohydrate, lipid, and energy metabolism and influence transportation processes in the early IVF embryo.

  2. Expression and localization of heterogeneous nuclear ribonucleoprotein K in mouse ovaries and preimplantation embryos

    Energy Technology Data Exchange (ETDEWEB)

    Zhang, Ping [The International Peace Maternity and Child Health Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai (China); Wang, Ningling [Department of Assisted Reproduction, Shanghai Ninth People' s Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai (China); Lin, Xianhua; Jin, Li [The International Peace Maternity and Child Health Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai (China); Xu, Hong, E-mail: xuhong1168@126.com [The International Peace Maternity and Child Health Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai (China); Li, Rong [The International Peace Maternity and Child Health Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai (China); Huang, Hefeng, E-mail: huanghefg@hotmail.com [The International Peace Maternity and Child Health Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai (China)

    2016-02-26

    Heterogeneous nuclear ribonucleoprotein K (hnRNP K), an evolutionarily conserved protein, is involved in several important cellular processes that are relevant to cell proliferation, differentiation, apoptosis, and cancer development. However, details of hnRNP K expression during mammalian oogenesis and preimplantation embryo development are lacking. The present study investigates the expression and cellular localization of K protein in the mouse ovaries and preimplantation embryos using immunostaining. We demonstrate, for the first time, that hnRNP K is abundantly expressed in the nuclei of mouse oocytes in primordial, primary and secondary follicles. In germ vesicle (GV)-stage oocytes, hnRNP K accumulates in the germinal vesicle in a spot distribution manner. After germinal vesicle breakdown, speckled hnRNP K is diffusely distributed in the cytoplasm. However, after fertilization, the K protein relocates into the female and male pronucleus and persists in the blastomere nuclei. Localization of K protein in the human ovary and ovarian granulosa cell tumor (GCT) was also investigated. Overall, this study provides important morphological evidence to better understand the possible roles of hnRNP K in mammalian oogenesis and early embryo development. - Highlights: • HnRNP K localizes in the nucleus of GV-stage oocyte in a punctate distribution. • HnRNP K strongly accumulates in zygotic pronuclei as condensed spots. • The localization of hnRNP K during oogenesis and embryogenesis is characteristic. • HnRNP K might have an important role in oogenesis and embryonic development.

  3. Role of lipids on elongation of the preimplantation conceptus in ruminants.

    Science.gov (United States)

    Ribeiro, Eduardo S; Santos, José E P; Thatcher, William W

    2016-10-01

    Elongation of the preimplantation conceptus is a prerequisite for successful pregnancy in ruminants and depends on histotroph secretion by the endometrium. Lipids are an essential component of the histotroph, and recent studies indicate that lipids have important roles in the elongation phase of conceptus development. The onset of elongation is marked by dynamic changes in the transcriptome of trophectoderm cells, which are associated with lipid metabolism. During elongation, the trophectoderm increases transcript expression of genes related to uptake, metabolism and de novo biosynthesis of fatty acids and prostaglandins. Expression of the gene PPARG increases substantially, and activation of the transcription factor PPARG by binding of lipid ligands appears to be crucial for the coordination of cell biology during elongation. Lipids accumulated in the epithelial cells of the endometrium during diestrus are likely the most important source of fatty acids for utilization by the conceptus and become available in the uterine lumen through exporting of exosomes, microvesicles, carrier proteins and lipoproteins. Targeting of uterine lipid metabolism and PPARG activity during preimplantation conceptus development through nutraceutical diets may be a good strategy to improve pregnancy survival and reproductive efficiency in ruminants.

  4. Lower implantation rates in high responders: evidence for an altered endocrine milieu during the preimplantation period.

    Science.gov (United States)

    Pellicer, A; Valbuena, D; Cano, F; Remohí, J; Simón, C

    1996-06-01

    To determine serum E2 and P levels around the time of implantation in normal and high IVF responders. In Vitro Fertilization program at the Instituto Valenciano de Infertilidad. Twenty-nine women undergoing IVF, who accepted to be studied daily, were classified according to the number of oocytes retrieved in normal (n = 16) and high responders (n = 13). Prospective study in which blood was drawn daily from the day of hCG administration (day 0) up to 7 days later (day 6). In vitro fertilization parameters (number of ampules, FSH-hMG, number of oocytes, fertilization rates, number of transferred embryos, implantation rates, and pregnancy rates); serum E2 and P levels during the 7 days of the study. Implantation rate was significantly higher in normal (18.5%) as compared with high (0%) responders. Estradiol and P levels were elevated significantly in high responders. The E2:P ratio was significantly different between normal and high responders during the preimplantation period. Pregnancy and implantation rates decreased as serum E2 levels increased on days 4 to 6 of the study. A different endocrine milieu between normal and high responders is detected by daily steroid measurements up to the preimplantation period, suggesting that this difference could be responsible for an impaired implantation in high responder patients undergoing IVF. An increase in serum E2 levels seems to be the cause of this difference.

  5. [Effect of maternal genotype on the rate of preimplantation development in mice].

    Science.gov (United States)

    Osipov, V V; Vakhrusheva, M P

    1981-01-01

    The genetic control of the rate of preimplantation development was studied in the mouse embryos. The number of cells in the embryo and the percentage of embryos at the blastocyst stage were determined on the 3.5 day of pregnancy. The experiments were carried out with CBA, A/He, C57Bl/Mib mice and mice homozygous by the mutant genes white (Miwh), fidget (fi) and ocular retardation (or), congenic with the inbred C57Bl/Mib mice. Contrasting differences were found between C57Bl/Mib and fi/fi mice. The rate of development of the morphologically normal C57Bl/Mib and fi/fi and F1 embryo was shown to depend on the maternal genotype, rather than on the paternal one. The effect of maternal genotype of the rate of preimplantation development was related to differences in the time of beginning of the cleavage. The rate of cleavage is similar for the C57Bl/Mib, fi/fi and F1 embryos.

  6. Impact of different patterns of sperm chromosomal abnormalities on the chromosomal constitution of preimplantation embryos.

    Science.gov (United States)

    Rodrigo, Lorena; Peinado, Vanessa; Mateu, Emilia; Remohí, José; Pellicer, Antonio; Simón, Carlos; Gil-Salom, Manuel; Rubio, Carmen

    2010-09-01

    To evaluate the effect of sperm chromosome abnormalities--disomy for sex chromosomes and diploidy--in the chromosomal constitution of preimplantation embryos. Retrospective cohort study. Infertility clinic. Three groups: 46,XY infertile men with increased incidence of sex chromosome disomy in sperm; 46,XY infertile men with increased diploidy rates in sperm; 47,XYY infertile men with increased sex chromosome disomy and diploidy rates in sperm. Sperm collection for fluorescence in situ hybridization analysis. Embryo biopsy for preimplantation genetic screening. Frequencies of numerical abnormalities in sperm for chromosomes 13, 18, 21, X, and Y, and in embryos for chromosomes 13, 16, 18, 21, 22, X, and Y. A significant increase of chromosomally abnormal and mosaic embryos was observed in the three study groups compared with controls. Those sperm samples with increased sex chromosome disomy rates produced significantly higher percentages of aneuploid embryos, with a threefold increase for sex chromosomes. Sperm samples with increased diploidy rates were mainly associated to the production of triploid embryos. A strong correlation between sperm and embryo chromosomal constitution has been shown in infertile men with 46,XY and 47,XYY karyotypes. Copyright (c) 2010 American Society for Reproductive Medicine. Published by Elsevier Inc. All rights reserved.

  7. The Presence of Anti-HLA Antibodies before and after Allogeneic Hematopoietic Stem Cells Transplantation from HLA-Mismatched Unrelated Donors

    Directory of Open Access Journals (Sweden)

    Anna Koclega

    2012-01-01

    Full Text Available Although anti-human leukocyte antigen antibodies (anti-HLA Abs are important factors responsible for graft rejection in solid organ transplantation and play a role in post-transfusion complications, their role in allogeneic hematopoietic stem cell transplantation (allo-HSCT has not been finally defined. Enormous polymorphism of HLA-genes, their immunogenicity and heterogeneity of antibodies, as well as the growing number of allo-HSCTs from partially HLA-mismatched donors, increase the probability that anti-HLA antibodies could be important factors responsible for the treatment outcomes. We have examined the incidence of anti-HLA antibodies in a group of 30 allo-HSCT recipients from HLA-mismatched unrelated donors. Anti-HLA Abs were identified in sera collected before and after allo-HSCT. We have used automated DynaChip assay utilizing microchips bearing purified class I and II HLA antigens for detection of anti-HLA Abs. We have detected anit-HLA antibodies against HLA-A, B, C, DR, DQ and DP, but no donor or recipient-specific anti-HLA Abs were detected in the studied group. The preliminary results indicate that anti-HLA antibodies are present before and after allo-HSCT in HLA-mismatched recipients.

  8. Promoter methylation and mRNA expression of HLA-G in relation to HLA-G protein expression in colorectal cancer.

    Science.gov (United States)

    Swets, Marloes; Seneby, Lina; Boot, Arnoud; van Wezel, Tom; Gelderblom, Hans; van de Velde, Cornelis J H; van den Elsen, Peter J; Kuppen, Peter J K

    2016-09-01

    Expression of human leukocyte antigen-G (HLA-G) is a suggested mechanism used by tumor cells to escape from host immune recognition and destruction. Advances in the field have made it evident that HLA-G is expressed in different types of malignancies including colorectal cancer (CRC). We analyzed HLA-G expression in 21 low passage CRC cell lines. The level of DNA methylation of the HLA-G gene and the presence of mRNA encoding HLA-G was measured. Moreover, HLA-G protein expression was determined by flow cytometry and immunohistochemistry (IHC). IHC was performed with three different monoclonal antibodies (mAbs) (4H84, MEM-G/1 and MEM-G/2). In addition, HLA-G protein expression was measured in matching primary tumor tissues. RNA analysis using RT-PCR followed by sequencing in 6 samples indicated strong homology of the PCR product with HLA-G3 in 5 samples. In accordance, in none of the cell lines, HLA-G1 expression was detected by flow-cytometry. Furthermore, no association between HLA-G DNA methylation patterns and HLA-G mRNA expression was observed. In addition, different immunohistochemical staining profiles among various anti-HLA-G mAbs were observed. In conclusion, the results of this study show that the HLA-G3 isoform was expressed in some of the CRC cell lines irrespective of the level of DNA methylation of HLA-G.

  9. Promiscuous Recognition of a Trypanosoma cruzi CD8+ T Cell Epitope among HLA-A2, HLA-A24 and HLA-A1 Supertypes in Chagasic Patients.

    Directory of Open Access Journals (Sweden)

    Paola Lasso

    Full Text Available TcTLE is a nonamer peptide from Trypanosoma cruzi KMP-11 protein that is conserved among different parasite strains and that is presented by different HLA-A molecules from the A2 supertype. Because peptides presented by several major histocompatibility complex (MHC supertypes are potential targets for immunotherapy, the aim of this study was to determine whether MHC molecules other than the A2 supertype present the TcTLE peptide.From 36 HLA-A2-negative chagasic patients, the HLA-A genotypes of twenty-eight patients with CD8+ T cells that recognized the TcTLE peptide using tetramer (twenty or functional (eight assays, were determined. SSP-PCR was used to identify the A locus and the allelic variants. Flow cytometry was used to analyze the frequency of TcTLE-specific CD8+ T cells, and their functional activity (IFN-γ, TNFα, IL-2, perforin, granzyme and CD107a/b production was induced by exposure to the TcTLE peptide. All patients tested had TcTLE-specific CD8+ T cells with frequencies ranging from 0.07-0.37%. Interestingly, seven of the twenty-eight patients had HLA-A homozygous alleles: A*24 (5 patients, A*23 (1 patient and A*01 (1 patient, which belong to the A24 and A1 supertypes. In the remaining 21 patients with HLA-A heterozygous alleles, the most prominent alleles were A24 and A68. The most common allele sub-type was A*2402 (sixteen patients, which belongs to the A24 supertype, followed by A*6802 (six patients from the A2 supertype. Additionally, the A*3002/A*3201 alleles from the A1 supertype were detected in one patient. All patients presented CD8+ T cells producing at least one cytokine after TcTLE peptide stimulation.These results show that TcTLE is a promiscuous peptide that is presented by the A24 and A1 supertypes, in addition to the A2 supertype, suggesting its potential as a target for immunotherapy.

  10. Analysis of allele frequencies of HLA-DRB1 * 12 : 01 : 01G and HLA-DRB1 * 14 : 01 : 01G groups%HLA-DRB1*12:01:01G和HLA-DRB1*14:01:01G组内等位基因频率的统计分析

    Institute of Scientific and Technical Information of China (English)

    何俊俊; 章伟; 和艳敏; 王炜; 韩浙东; 陈男英; 朱发明; 吕杭军; 严力行

    2012-01-01

    目的 区分并计算人类白细胞抗原(human leukocyte antigen,HLA) HLA-DRB1* 12:01:01G(HLA-DRB1* 12:01:01/12:06/12:10/12:17)和HLA-DRB1* 14:01:01G(DRB1* 14:01:01/14:54)组内等位基因及其相对频率,并分析其与HLA-DRB3和HLA-DQB1的连锁情况.方法 收集115例HLA-DRB1*12:01:01G组和108例HLA-DRB1*14:01:01G组标本,采用单核苷酸序列分析(polymerase chain reaction-sequence based typing,PCR-SBT)方法检测HLA-DRB1* 12:01:01G组等位基因的第1~3外显子序列和HLA-DRB1* 14:01:01G组的第2、3外显子序列.HLA-DRB3和HLA-DQB1基因分型采用PCR-SBT方法.结果 115例HLA-DRB1* 12:01:01G组标本中,101例(87.8%)为HLA-DRB1* 12:01:01,14例(12.2%)为HLA-DRB1* 12:10,未发现HLA-DRB1* 12:06和HLA-DRB1* 12:17. 108例HLA-DRB1*14:01:01G组标本全部为HLA-DRB1*14:54. HLA-DRB1*12:01:01与HLA-DRB3* 01:01:02和HLA-DQB1* 03:01连锁,HLA-DRB1* 12:10则与HLA-DRB3* 02:02:01和HLA-DQB1* 03:01连锁.HLA-DRB1* 14:54与HLA-DRB3* 02:02:01和HLA-DQB1* 05:02、*05:03连锁.结论 HLA-DRB1* 12:01:01G组中HLA-DRB1* 12:01:01频率最高,而HLA-DRB1* 14:01:01G组则以HLA-DRB1* 14:54频率最高.%Objective To discriminate and analyze the relative frequencies of alleles in HLA-DRB1 * 12:01:01G(HLA-DRB1 * 12:01:01 /12:06/12:10/12:17) and HLA-DRB1 * 14:01:01G (DRB1 * 14:01:01/14:54) groups and assess their associations with HLA-DRB3 and HLA-DQB1 loci.Methods A total of 115 DNA samples previously typed as HLA-DRB1 * 12:01:01G and 108 samples from HLA-DRB1 * 14:01:01G were selected.DNA sequences for exons 1 to 3 of the HLA-DRB1 locus were analyzed for HLA-DRB1 * 12:01:01G,and exons 2 to 3 were analyzed for HLA-DRB1 * 14:01:01G by polymerase chain reaction sequence-based typing (PCR-SBT).Genotyping of HLA-DRB3 and HLA-DQB1 were achieved by PCRSBT.Results Among 115 samples previously typed as HLA-DRB1 * 12:01:01G,101 (87.8%) were confirmed as HLA-DRB1 * 12:01:01 and 14 (12.2%) were HLA-DRB1 * 12:10,but HLA-DRB1 * 12:06 and HLA-DRB1 * 12

  11. Principles guiding embryo selection following genome-wide haplotyping of preimplantation embryos.

    Science.gov (United States)

    Dimitriadou, Eftychia; Melotte, Cindy; Debrock, Sophie; Esteki, Masoud Zamani; Dierickx, Kris; Voet, Thierry; Devriendt, Koen; de Ravel, Thomy; Legius, Eric; Peeraer, Karen; Meuleman, Christel; Vermeesch, Joris Robert

    2017-03-01

    How to select and prioritize embryos during PGD following genome-wide haplotyping? In addition to genetic disease-specific information, the embryo selected for transfer is based on ranking criteria including the existence of mitotic and/or meiotic aneuploidies, but not carriership of mutations causing recessive disorders. Embryo selection for monogenic diseases has been mainly performed using targeted disease-specific assays. Recently, these targeted approaches are being complemented by generic genome-wide genetic analysis methods such as karyomapping or haplarithmisis, which are based on genomic haplotype reconstruction of cell(s) biopsied from embryos. This provides not only information about the inheritance of Mendelian disease alleles but also about numerical and structural chromosome anomalies and haplotypes genome-wide. Reflections on how to use this information in the diagnostic laboratory are lacking. We present the results of the first 101 PGD cycles (373 embryos) using haplarithmisis, performed in the Centre for Human Genetics, UZ Leuven. The questions raised were addressed by a multidisciplinary team of clinical geneticist, fertility specialists and ethicists. Sixty-three couples enrolled in the genome-wide haplotyping-based PGD program. Families presented with either inherited genetic variants causing known disorders and/or chromosomal rearrangements that could lead to unbalanced translocations in the offspring. Embryos were selected based on the absence or presence of the disease allele, a trisomy or other chromosomal abnormality leading to known developmental disorders. In addition, morphologically normal Day 5 embryos were prioritized for transfer based on the presence of other chromosomal imbalances and/or carrier information. Some of the choices made and principles put forward are specific for cleavage-stage-based genetic testing. The proposed guidelines are subject to continuous update based on the accumulating knowledge from the implementation of

  12. Os antígenos HLA e a hemoterapia HLA antigens and transfusion therapy

    Directory of Open Access Journals (Sweden)

    Ana Maria Sell

    2002-04-01

    Full Text Available As moléculas ou antígenos HLA são glicoproteínas de superfície celular, expressas pelas células nucleadas, envolvidas na regulação da resposta imune. Essas moléculas são altamente polimórficas, diferindo entre indivíduos e grupos populacionais. Como nos últimos anos ocorreu um grande aumento nas transfusões sangüíneas, devido ao uso de quimioterápicos e à confiança na segurança do procedimento, a aloimunização, pelos antígenos HLA, tornou-se preocupação e objeto de análise. Neste trabalho, revisamos os aspectos básicos do sistema HLA e o seu papel na hemoterapia. Para tanto, os fatores imunológicos relacionados à alossensibilização e à imunomodulação foram abordados, enfatizando a refratariedade plaquetária, o desenvolvimento da doença enxerto contra o hospedeiro, a influência da alossensibilização nos transplantes e a importância da transfusão alogênica na prevenção de abortos recorrentesHLA molecules or antigens are cellular surface glycoproteins that are involved in the regulation of immune reaction. The HLA complex includes the most polymorphic genes in human. As in the last years we observed a large increase in the transfusions therapy, due the use of the chemotherapeutic agents and the safety of the procedure, the alloimunization has been subject of study. The aim of this work was to revise basic aspects of the system HLA and its role in the transfusion therapy. In order to achieve it, immunological factors involved in the alloimunization and the immunomodulation were approached, emphasizing platelet transfusion therapy in refractory patient, the development of the graft-versus- host disease, the influence of the allossensibilization in the transplants and the importance of the allogenic transfusion in the recurrent miscarriage

  13. HLA-DP related suppression of mixed lymphocyte reaction with alloactivated lymphocytes

    DEFF Research Database (Denmark)

    Ødum, Niels; Hofmann, B; Jakobsen, B K

    1986-01-01

    We studied the influence of HLA class I and class II antigens on the suppression of the MLR induced by primed lymphocytes (PLs) alloactivated in vitro. The suppression of 14 different PLs of 83 MLRs was analyzed. The PLs were primed against (i) HLA-DP (SB) (ii) HLA-DR/DQ or (iii) both HLA-DP and DR...

  14. Impact on parents of hla-dq/dq8 genotyping in healthy children from coeliac families

    NARCIS (Netherlands)

    Wessels, M.M.S.; Vriezinga, S.L.; Koletzko, S.; Werkstetter, K.; Castillejo-De Villasante, G.; Shamir, R.; Hartman, C.; Putter, H.; Pal, S.M. van der; Wijmenga, C.; Bravi, E.; Mearin, M.L.

    2015-01-01

    Due to the association of coeliac disease and HLA-specificities DQ2 and DQ8, HLA-typing can be used for risk determination of the disease. This study was designed to evaluate the knowledge of parents from coeliac families regarding HLA-typing and the impact of HLA-typing on the perception of the hea

  15. Associations Between Pre-Implant Psychosocial Factors and Spinal Cord Stimulation Outcome: Evaluation Using the MMPI-2-RF.

    Science.gov (United States)

    Block, Andrew R; Marek, Ryan J; Ben-Porath, Yossef S; Kukal, Deborah

    2017-01-01

    Spinal cord stimulation (SCS) has variable effectiveness in controlling chronic pain. Previous research has demonstrated that psychosocial factors are associated with diminished results of SCS. The objective of this investigation is to examine associations between pre-implant psychological functioning as measured by the Minnesota Multiphasic Personality Inventory-2-Restructured Form (MMPI-2-RF) and SCS outcomes. SCS candidates at two sites (total N = 319) completed the MMPI-2-RF and measures of pain, emotional distress, and functional ability as part of a pre-implant psychological evaluation. At an average of 5 months post-implant, patients completed the measures of pain and emotional distress a second time. Poorer SCS outcomes and poorer patient satisfaction were associated with higher pre-implant MMPI-2-RF scores on scales used to assess emotional dysfunction, somatic/cognitive complaints, and interpersonal problems. Ways through which pre-implant psychological evaluations of spinal cord stimulator candidates can be informed by MMPI-2-RF findings are discussed. © The Author(s) 2015.

  16. Temporal and Developmental-Stage Variation in the Occurrence of Mitotic Errors in Tripronuclear Human Preimplantation Embryos

    NARCIS (Netherlands)

    Mantikou, Eleni; van Echten-Arends, Jannie; Sikkema-Raddatz, Birgit; van der Veen, Fulco; Repping, Sjoerd; Mastenbroek, Sebastiaan

    2013-01-01

    Mitotic errors during early development of human preimplantation embryos are common, rendering a large proportion of embryos chromosomally mosaic. It is also known that the percentage of diploid cells in human diploid-aneuploid mosaic embryos is higher at the blastocyst than at the cleavage stage. I

  17. FISH analysis of 15 chromosomes in human day 4 and 5 preimplantation embryos : the added value of extended aneuploidy detection

    NARCIS (Netherlands)

    Baart, E. B.; van den Berg, I.; Martini, E.; Eussen, H. J.; Fauser, B. C. J. M.; Van Opstal, D.

    2007-01-01

    Objective Screening for an increased number of chromosomes may improve the detection of abnormal embryos and thus contribute to the capability of preimplantation genetic screening (PGS) to detect the embryo(s) for transfer in IVF with the best chance for a healthy child. Good-quality day 4 and 5 emb

  18. What is the quality of the evidence base for pre-implant surgery of the atrophic jaw?

    NARCIS (Netherlands)

    Blackburn, T.K.; Cawood, J.I.; Stoelinga, P.J.W.; Lowe, D.

    2008-01-01

    This review aimed to evaluate the level of evidence for bone augmentation preimplant surgery for atrophic jaws in studies which measure outcome. Medline, Embase, Cochrane library and online journal searches were performed with a defined search strategy and the abstracts screened against selection cr

  19. Shock and patient preimplantation type D personality are associated with poor health status in patients with implantable cardioverter-defibrillator

    DEFF Research Database (Denmark)

    Pedersen, Susanne S.; Tekle, Fetene B; Hoogwegt, Madelein T

    2012-01-01

    Implantable cardioverter-defibrillator (ICD) shock is a critical event to patients associated with well-being after implantation, although other factors may play an equally important role. We compared the association of shock and the patient's preimplantation personality with health status, using...

  20. Sex and PRNP genotype determination in preimplantation caprine embryos.

    Science.gov (United States)

    Guignot, F; Perreau, C; Cavarroc, C; Touzé, J-L; Pougnard, J-L; Dupont, F; Beckers, J-F; Rémy, B; Babilliot, J-M; Bed'Hom, B; Lamorinière, J M; Mermillod, P; Baril, G

    2011-08-01

    The objective of this study was to test the accuracy of genotype diagnosis after whole amplification of DNA extracted from biopsies obtained by trimming goat embryos and to evaluate the viability of biopsied embryos after vitrification/warming and transfer. Whole genome amplification (WGA) was performed using Multiple Displacement Amplification (MDA). Sex and prion protein (PRNP) genotypes were determined. Sex diagnosis was carried out by PCR amplification of ZFX/ZFY and Y chromosome-specific sequences. Prion protein genotype determination was performed on codons 142, 154, 211, 222 and 240. Embryos were collected at day 7 after oestrus and biopsied either immediately after collection (blastocysts and expanded blastocysts) or after 24 h of in vitro culture (compacted morulae). Biopsied embryos were frozen by vitrification. Vitrified whole embryos were kept as control. DNA of biopsies was extracted and amplified using MDA. Sex diagnosis was efficient for 97.4% of biopsies and PRNP genotyping was determined in 78.7% of biopsies. After embryo transfer, no significant difference was observed in kidding rate between biopsied and vitrified control embryos, whereas embryo survival rate was different between biopsied and whole vitrified embryos (p = 0.032). At birth, 100% of diagnosed sex and 98.2% of predetermined codons were correct. Offspring PRNP profiles were in agreement with parental genotype. Whole genome amplification with MDA kit coupled with sex diagnosis and PRNP genotype predetermination are very accurate techniques to genotype goat embryos before transfer. These novel results allow us to plan selection of scrapie-resistant genotypes and kid sex before transfer of cryopreserved embryo.

  1. HLA-G as a Tolerogenic Molecule in Transplantation and Pregnancy

    Science.gov (United States)

    da Silva Nardi, Fabiola; Wagner, Bettina; Horn, Peter A.

    2014-01-01

    HLA-G is a nonclassical HLA class I molecule. In allogeneic situations such as pregnancy or allograft transplantation, the expression of HLA-G has been related to a better acceptance of the fetus or the allograft. Thus, it seems that HLA-G is crucially involved in mechanisms shaping an allogeneic immune response into tolerance. In this contribution we focus on (i) how HLA-G is involved in transplantation and human reproduction, (ii) how HLA-G is regulated by genetic and microenvironmental factors, and (iii) how HLA-G can offer novel perspectives with respect to therapy. PMID:25143957

  2. HLA region excluded by linkage analyses of early onset periodontitis

    Energy Technology Data Exchange (ETDEWEB)

    Sun, C.; Wang, S.; Lopez, N.

    1994-09-01

    Previous studies suggested that HLA genes may influence susceptibility to early-onset periodontitis (EOP). Segregation analyses indicate that EOP may be due to a single major gene. We conducted linkage analyses to assess possible HLA effects on EOP. Fifty families with two or more close relatives affected by EOP were ascertained in Virginia and Chile. A microsatellite polymorphism within the HLA region (at the tumor necrosis factor beta locus) was typed using PCR. Linkage analyses used a donimant model most strongly supported by previous studies. Assuming locus homogeneity, our results exclude a susceptibility gene within 10 cM on either side of our marker locus. This encompasses all of the HLA region. Analyses assuming alternative models gave qualitatively similar results. Allowing for locus heterogeneity, our data still provide no support for HLA-region involvement. However, our data do not statistically exclude (LOD <-2.0) hypotheses of disease-locus heterogeneity, including models where up to half of our families could contain an EOP disease gene located in the HLA region. This is due to the limited power of even our relatively large collection of families and the inherent difficulties of mapping genes for disorders that have complex and heterogeneous etiologies. Additional statistical analyses, recruitment of families, and typing of flanking DNA markers are planned to more conclusively address these issues with respect to the HLA region and other candidate locations in the human genome. Additional results for markers covering most of the human genome will also be presented.

  3. Immunoregulatory Role of HLA-G in Allergic Diseases

    Directory of Open Access Journals (Sweden)

    Giuseppe Murdaca

    2016-01-01

    Full Text Available Allergic diseases are sustained by a T-helper 2 polarization leading to interleukin-4 secretion, IgE-dependent inflammation, and mast cell and eosinophil activation. HLA-G molecules, both in membrane-bound and in soluble forms, play a central role in modulation of immune responses. Elevated levels of soluble HLA-G (sHLA-G molecules are detected in serum of patients with allergic rhinitis to seasonal and perennial allergens and correlate with allergen-specific IgE levels, clinical severity, drug consumption, and response to allergen-specific immunotherapy. sHLA-G molecules are also found in airway epithelium of patients with allergic asthma and high levels of sHLA-G molecules are detectable in plasma and bronchoalveolar lavage of asthmatic patients correlating with allergen-specific IgE levels. Finally, HLA-G molecules are expressed by T cells, monocytes-macrophages, and Langerhans cells infiltrating the dermis of atopic dermatitis patients. Collectively, although at present it is difficult to completely define the role of HLA-G molecules in allergic diseases, it may be suggested that they are expressed and secreted by immune cells during the allergic reaction in an attempt to suppress allergic inflammation.

  4. HLA-class II genes in Mexican Amerindian Mayas: relatedness with Guatemalan Mayans and other populations.

    Science.gov (United States)

    Vargas-Alarcón, Gilberto; Granados, Julio; Pérez-Hernández, Nonanzit; Rodríguez-Pérez, José Manuel; Canto-Cetina, Thelma; Coral-Vázquez, Ramón Mauricio; Areces, Cristina; Gómez-Prieto, Pablo; Arnaiz-Villena, Antonio

    2011-01-01

    We analyzed the HLA class II allele frequencies in 50 healthy unrelated Mayan individuals. The relationship with other worldwide populations was studied by using HLA data from 71 different populations. The most frequent alleles were HLA-DRB1*04, HLA-DRB1*01, HLA-DQB1*0302 and HLA-DQB1*0501. When comparisons with other Mexican Amerindian groups were made, some differences were observed. Mayans showed an increased frequency of HLA-DRB1*01 when compared to Nahuas, Mayos, Teenek and Mazatecans (p Mayas showing that languages do not correlate with genes, particularly in Amerindians. The data corroborate the restricted polymorphism of HLA-DRB1 and DQB1 alleles and the high frequency of HLA-DRB1*04 and HLA-DQB1*0302 in Mayans from Mexico.

  5. Infection and HLA-G Molecules in Nasal Polyposis

    Directory of Open Access Journals (Sweden)

    Roberta Rizzo

    2014-01-01

    Full Text Available Sinonasal polyposis (SNP is a chronic inflammatory pathology with an unclear aetiopathogenesis. Human papillomavirus (HPV infection is one candidate for the development of SNP for its epithelial cell trophism, hyperproliferative effect, and the induction of immune-modulatory molecules as HLA-G. We enrolled 10 patients with SNP without concomitant allergic diseases (SNP-WoAD, 10 patients with SNP and suffering from allergic diseases (SNP-WAD, and 10 control subjects who underwent rhinoplasty. We analyzed the presence of high- and low-risk HPV DNA and the expression of membrane HLA-G (mHLA-G and IL-10 receptor (IL-10R and of soluble HLA-G (sHLA-G and IL-10 by polyp epithelial cells. The results showed the presence of HPV-11 in 50% of SNP-WoAD patients (OR:5.5, all characterized by a relapsing disease. HPV-11 infection was absent in nonrelapsing SNP-WoAD patients, in SNP-WAD patients and in controls, supporting the hypothesis that HPV-11 increases risk of relapsing disease. HPV-11 positive SNP-WoAD patients presented with mHLA-G and IL-10R on epithelial cells from nasal polyps and showed secretion of sHLA-G and IL-10 in culture supernatants. No HLA-G expression was observed in HPV negative polyps. These data highlight new aspects of polyposis aetiopathogenesis and suggest HPV-11 and HLA-G/IL-10 presence as prognostic markers in the follow-up of SNP-WoAD.

  6. DHLAS: A web-based information system for statistical genetic analysis of HLA population data.

    Science.gov (United States)

    Thriskos, P; Zintzaras, E; Germenis, A

    2007-03-01

    DHLAS (database HLA system) is a user-friendly, web-based information system for the analysis of human leukocyte antigens (HLA) data from population studies. DHLAS has been developed using JAVA and the R system, it runs on a Java Virtual Machine and its user-interface is web-based powered by the servlet engine TOMCAT. It utilizes STRUTS, a Model-View-Controller framework and uses several GNU packages to perform several of its tasks. The database engine it relies upon for fast access is MySQL, but others can be used a well. The system estimates metrics, performs statistical testing and produces graphs required for HLA population studies: (i) Hardy-Weinberg equilibrium (calculated using both asymptotic and exact tests), (ii) genetics distances (Euclidian or Nei), (iii) phylogenetic trees using the unweighted pair group method with averages and neigbor-joining method, (iv) linkage disequilibrium (pairwise and overall, including variance estimations), (v) haplotype frequencies (estimate using the expectation-maximization algorithm) and (vi) discriminant analysis. The main merit of DHLAS is the incorporation of a database, thus, the data can be stored and manipulated along with integrated genetic data analysis procedures. In addition, it has an open architecture allowing the inclusion of other functions and procedures.

  7. HLA ANTIGENS AND VOGT-KOYANAGI- HARADA'S DISEASE

    Institute of Scientific and Technical Information of China (English)

    1991-01-01

    Thirty patients with Vogt-Koyanagi-Haradas disease were typed for HLA-A and HLA-B antigenic determinants by a microlymphocytotoxicity technique. HLA-B22 antigen showed an increased frequency of 43.3% in the patient group(relative risk=8.69; exact P<0.0001; corrected P<0.0025) compared with normal control group(frequency=7.69%). This association suggests that immunogenetic factor may play an important role in the pathogenesis of Vogt-Koyanagi-Harada's disease.

  8. Alterations of intraembryonic metabolites in preimplantation mouse embryos exposed to elevated concentrations of glucose: a metabolic explanation for the developmental retardation seen in preimplantation embryos from diabetic animals.

    Science.gov (United States)

    Moley, K H; Chi, M M; Manchester, J K; McDougal, D B; Lowry, O H

    1996-06-01

    Preimplantation mouse embryos exposed to hyperglycemia, whether in vivo or in vitro, experience delayed development from the 2-cell to blastocyst stage. By comparing metabolites from embryos exposed to high vs. normal glucose conditions, a metabolic explanation for the delayed growth pattern was sought. Fertilized 1-cell embryos obtained from superovulated B5 x CBA F1 mice were cultured for 96 h in medium containing 2.8 mM glucose (C) or in medium with added glucose to give 10 mM, 30 mM, or 52 mM glucose (HG). After incubation, each embryo was quick-frozen and freeze-dried. Metabolites were assayed by the ultramicrofluorometric technique and enzymatic cycling to obtain measurable levels in single embryos. Embryos cultured in HG exhibited 7-fold higher intracellular glucose levels than those cultured in C (C: 2.25 +/- 0.6 vs. HG: 16.61 +/- 2.4 mmol/kg wet weight; p Krebs cycle metabolites are elevated and correspond to the degree of developmental delay. These findings suggest that a metabolic abnormality may be responsible for retarded development experienced by embryos exposed to high glucose.

  9. Study of the structure and impact of human leukocyte antigen (HLA)-G-A, HLA-G-B, and HLA-G-DRB1 haplotypes in families with recurrent miscarriage

    DEFF Research Database (Denmark)

    Kolte, Astrid Marie; Steffensen, Rudi Nora; Nielsen, Henriette S

    2010-01-01

    of recurrent miscarriage (RM). Due to existence of strong linkage disequilibrium (LD) in the HLA region, the primary susceptibility genes for RM in the HLA-G region have not yet been identified. HLA-A, -B, -DRB1, and -G14bp polymorphisms were investigated in 29 Caucasian families with two or more siblings...

  10. ENDOGENOUS EXPRESSION AND HLA STABILIZATION ASSAY OF PLASMODIUM FALCIPARUM CTL EPITOPE MINIGENE IN HUMAN HLA-A2.1 AND HLA-B51 CELLS

    Institute of Scientific and Technical Information of China (English)

    唐玉阳; 王恒

    2001-01-01

    Objective. To evaluate the Plasmodium falciparum CTL epitope vaccines in HLA class I allele specific human cell lines that have high frequency among Chinese population. Methods. Synthesized oligonucleotides encoding for P.f. CTL epitope genes, constructed eukaryotic expression plasmids, transfected the minigenes into HLA class I allele specific human cell lines and identified endogenous expressing of the minigenes by RT-PCR and HLA stabilization assay. Results. Two mini-genes encoding Plasmodium falciparum CTL epitopes were designed and cloned, respectively, into an eukaryotic expressing vector to form TR26 which was restricted to HLA-B51, SH6 which was restricted to HLA-A2.1, and TS, which had the two aforementioned mini-genes fused in tandem. All of these CTL epitope genes were transfected and endogenously expressed in respective cell lines containing appropriate HLA molecules. The obviously increased expressions of HLA class I molecules were detected in the transfected cell lines. It was demonstrated that the two discrete Plasmodium falciparum epitope genes were effectively processed and presented, and the close proximity of the two epitope genes in one chain as in mini-gene TS did not interfere with the processing and presenting of each epitope gene in corresponding cell line. Conclusion. A successful expression and presentation of multiple CTL epitope mini-gene in MHC class I allele specific human cell lines were demonstrated by an in vitro assay, which could be corresponding to the vaccination of CTL vaccines in people with different MHC I molecules. This work also suggested the possibility of constructing a multiple CTL epitope plasmodium falciparum DNA vaccine that could cover most of Chinese population.

  11. Development of a high-resolution NGS-based HLA-typing and analysis pipeline.

    Science.gov (United States)

    Wittig, Michael; Anmarkrud, Jarl A; Kässens, Jan C; Koch, Simon; Forster, Michael; Ellinghaus, Eva; Hov, Johannes R; Sauer, Sascha; Schimmler, Manfred; Ziemann, Malte; Görg, Siegfried; Jacob, Frank; Karlsen, Tom H; Franke, Andre

    2015-06-23

    The human leukocyte antigen (HLA) complex contains the most polymorphic genes in the human genome. The classical HLA class I and II genes define the specificity of adaptive immune responses. Genetic variation at the HLA genes is associated with susceptibility to autoimmune and infectious diseases and plays a major role in transplantation medicine and immunology. Currently, the HLA genes are characterized using Sanger- or next-generation sequencing (NGS) of a limited amplicon repertoire or labeled oligonucleotides for allele-specific sequences. High-quality NGS-based methods are in proprietary use and not publicly available. Here, we introduce the first highly automated open-kit/open-source HLA-typing method for NGS. The method employs in-solution targeted capturing of the classical class I (HLA-A, HLA-B, HLA-C) and class II HLA genes (HLA-DRB1, HLA-DQA1, HLA-DQB1, HLA-DPA1, HLA-DPB1). The calling algorithm allows for highly confident allele-calling to three-field resolution (cDNA nucleotide variants). The method was validated on 357 commercially available DNA samples with known HLA alleles obtained by classical typing. Our results showed on average an accurate allele call rate of 0.99 in a fully automated manner, identifying also errors in the reference data. Finally, our method provides the flexibility to add further enrichment target regions.

  12. Prospective HLA-DR matching in cadaveric renal transplants: a single center study.

    Science.gov (United States)

    Mendez, R; Iwaki, Y; Mendez, R; Bogaard, T; Self, B

    1983-03-01

    We reviewed 77 potential cadaveric allograft recipients who had undergone prospective HLA-A and B locus and HLA-DR antigen identification. Matching was accomplished, giving first priority to HLA-DR compatibility and relying on HLA-A and B antigen matching only in situations of total HLA-DR incompatibility. Complete HLA-DR identification occurred in 56 per cent of all patients. There were 15 patients (19.5 per cent) who received a 2/2 HLA-DR perfect match, with 86.7 plus or minus 8.8 per cent 1-year actuarial graft survival, and 41 (53 per cent) who received a 1/2 HLA-DR match, with 58.2 plus or minus 7.8 per cent 1-year actual allograft survival. Finally, 21 patients (27 per cent) received a 0/2 HLA-DR match, with 64.9 plus or minus 10.7 per cent actual survival. These results and their mirrored mismatching results showed statistically significant allograft success in only the HLA-DR 2/2 matches. Matching for HLA 2 DR donors proved a statistically significant success over the other HLA-DR allograft matches and the older controversial matching system based on HLA-A and B locus antigens. The restricted gene polymorphism of the HLA-DR systems allows for a relatively high percentage of perfect HLA-DR matches.

  13. Clinical and immunological significance of HLA-E in stem cell transplantation and cancer.

    Science.gov (United States)

    Wieten, L; Mahaweni, N M; Voorter, C E M; Bos, G M J; Tilanus, M G J

    2014-12-01

    Human leukocyte antigen-E (HLA-E) is a nonclassical HLA class I molecule that canonically binds peptides derived from the leader sequence of classical HLA class I. HLA-E can also bind peptides from stress protein [e.g. heat shock protein 60 (Hsp60)] and pathogens, illustrating the importance of HLA-E for anti-viral and anti-tumor immunity. Like classical HLA class I molecules, HLA-E is ubiquitously expressed, however, it is characterized by only a very limited sequence variability and two dominant protein forms have been described (HLA-E*01:01 and HLA-E*01:03). HLA-E influences both the innate and the adaptive arms of the immune system by the engagement of inhibitory (e.g. NKG2A) and activating receptors [e.g. αβ T cell receptor (αβTCR) or NKG2C] on NK cells and CD8 T cells. The effects of HLA-E on the cellular immune response are therefore complex and not completely understood yet. Here, we aim to provide an overview of the immunological and clinical relevance of HLA-E and HLA-E polymorphism in stem cell transplantation and in cancer. We review novel insights in the mechanism via which HLA-E expression levels are controlled and how the cellular immune response in transplantation and cancer is influenced by HLA-E.

  14. Detection of HLA-DRB1 microchimerism using nested polymerase chain reaction and single-strand conformation polymorphism analysis.

    Science.gov (United States)

    Song, Eun Young; Chung, Hye Yoon; Joo, Shin Young; Roh, Eun Youn; Seong, Moon-Woo; Shin, Yunsu; Park, Myoung Hee

    2012-03-01

    For the detection of microchimerism, molecular methods detecting donor-specific HLA-DRB1 alleles in the recipient are most commonly used. Nested polymerase chain reaction sequence specific primer (nested PCR-SSP) methods widely used to increase the sensitivity of detection have been reported to give frequent false-positive reactions. We have developed a new method combining nested PCR with single-strand conformation polymorphism analysis (nested PCR-SSCP) and tested the 1 to 0.00001% level of microchimerism for 27 different HLA-DRB1 alleles. For most (26/27) of the HLA-DRB1 alleles tested, this method could detect 0.01 to 0.001% of microchimerism and its sensitivity was equal to or better than that of nested PCR-SSP tested in parallel. Its specificity was verified by visualizing particular DRB1-specific SSCP bands under test. Nested PCR-SSP indicated frequent false-positive reactions, mainly caused by nonspecific amplification of DRB3/B4/B5 alleles present in the major (recipient) DNAs. We have compared a real-time quantitative PCR for non-human leukocyte antigen (HLA) target (insertion/deletion marker) using a commercial kit (AlleleSEQR Chimerism assay), and its microchimerism detection sensitivity (around 0.1%) was 1 step (10 times) lower than that of nested PCR-SSP or -SSCP methods for HLA-DRB1 alleles. We validated that the newly designed nested PCR-SSCP affords good sensitivity and specificity and may be useful for studying microchimerism in clinical settings.

  15. HLA similarities indicate shared genetic risk in 21-hydroxylase autoantibody positive South African and United States Addison's disease.

    Science.gov (United States)

    Ross, I L; Babu, S; Armstrong, T; Zhang, L; Schatz, D; Pugliese, A; Eisenbarth, G; Baker Ii, P

    2014-10-01

    Genetic similarities between patients from the United States and South African (SA) Addison's Disease (AD) strengthen evidence for genetic association. SA-AD (n = 73), SA healthy controls (N = 78), and US-AD patients (N = 83) were genotyped for DQA1, DQB1, DRB1, and HLA-B alleles. Serum was tested for the quantity of 21OH-AA and IFNα-AA at the Barbara Davis Center. Although not as profound as in US-AD, in SA-AD 21OH-AA + subjects the predominantly associated risk haplotypes were DRB1*0301-DQB1*0201 (DR3), DRB1*04xx-DQB1*0302 (DR4), and the combined DR3/4 genotype. DQB1*0302 associated DRB1*04xx haplotypes conferred higher risk than those DRB1*04xx haplotypes associated with other DQB1 alleles. We found negative association in 21OH-AA + SA-AD for DQA1*0201-DQB1*0202 and DQA1*0101-DQB1*0501 vs SA controls, and positive association for DQA1*0401-DQB1*0402 vs US-AD. Apart from the class II DR3 haplotype, HLA-B8 did not have an independent effect; however together DR3 and HLA-B8 conferred the highest risk vs 21OH-AA negative SA-AD and SA-controls. HLA-B7 (often with DR4) conferred novel risk in 21OH-AA + SA-AD vs controls. This study represents the first comparison between South African and United States AD populations utilizing genotyping and serology performed at the same center. SA-AD and US-AD 21OH-AA + patients share common HLA risk haplotypes including DR4 (with HLA-B7) and DR3 (with HLA-B8), strengthening previously described HLA associations and implicating similar genetic etiology. © 2014 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd.

  16. Pregnancy outcome after preimplantation genetic diagnosis in an affected couple with X-linked adrenoleukodystrophy.

    Science.gov (United States)

    Iglesias, Miriam; Ceballos, Patricia; Giménez, Carles; García-Nebreda, Maria Isabel; Domínguez, Raquel; García-Enguídanos, Alberto

    2008-11-01

    To achieve a pregnancy free of X-linked adrenoleukodystrophy (X-ALD) by intracytoplasmic sperm injection (ICSI) and preimplantation genetic diagnosis (PGD). Case report. Clínica FIV Recoletos, a private IVF center. A couple in which the man had X-ALD. The ICSI protocol and PGD of the obtained embryos. Blastomeres were analyzed by fluorescence in situ hybridization using sex selection techniques. Embryos were transferred and pregnancy was diagnosed by hCG analysis and ultrasonographic examination. Ten embryos were obtained by ICSI. A biopsy was taken from eight embryos to perform PGD and two male embryos were transferred resulting in a twin pregnancy. This is the first registered gestation in which PGD has been used to prevent X-ALD transmission.

  17. Pre-implant orthodontics: achieving vertical bone height without osseous grafts.

    Science.gov (United States)

    Biggs, Jeffery; Beagle, Jay R

    2004-01-01

    Traditionally, orthodontic treatment has be involved with implant dentistry to correct malocclusion prior to surgical procedures. Most recently, orthodontics has become an invaluable adjunct to implant dentistry for treatment plans involving tooth replacement for sites diagnosed with localized advanced periodontitis. Loss of vertical bone height as a result of periodontal disease is difficult to overcome with hard tissue grafting. However, in cases where the failing or failed tooth is still present, an alternative method involving pre-implant orthodontics is being utilized to generate vertical bone height. Specifically, orthodontic intrusive and extrusive forces are exerted on the hopeles tooth or teeth to facilitate bone in the future implant site. The author presents a case demonstrating this technique.

  18. Genomic DNA methylation patterns in bovine preim-plantation embryos derived from in vitro fertilization

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    By using the approach of immunofluorescence staining with an antibody against 5-methylcytosine (5MeC), the present study detected the DNA methylation patterns of bovine zygotes and preimplanta-tion embryos derived from oocyte in vitro maturation (IVM), in vitro fertilization (IVF) and embryo in vitro culture (IVC). The results showed that: a) paternal-specific demethylation occurred in 61.5% of the examined zygotes, while 34.6% of them showed no demethylation; b) decreased methylation level was observed after the 8-cell stage and persisted through the morula stage, however methylation levels were different between blastomeres within the same embryos; c) at the blastocyst stage, the methyla-tion level was very low in inner cell mass, but high in trophectoderm cells. The present study suggests, at least partly, that IVM/IVF/IVC may have effects on DNA methylation reprogramming of bovine zygotes and early embryos.

  19. Anticipating issues related to increasing preimplantation genetic diagnosis use: a research agenda.

    Science.gov (United States)

    Klitzman, Robert; Appelbaum, Paul S; Chung, Wendy; Sauer, Mark

    2008-01-01

    Increasing use of preimplantation genetic diagnosis (PGD) poses numerous clinical, social, psychological, ethical, legal and policy dilemmas, many of which have received little attention. Patients and providers are now considering and using PGD for a widening array of genetic disorders, and patients may increasingly seek 'designer babies.' In the USA, although governmental oversight policies have been discussed, few specific guidelines exist. Hence, increasingly, patients and providers will face challenging ethical and policy questions of when and for whom to use PGD, and how it should be financed. These issues should be better clarified and addressed through collection of data concerning the current use of PGD in the USA, including factors involved in decision making about PGD use, as well as the education of the various communities that are, and should be, involved in its implementation. Improved understanding of these issues will ultimately enhance the development and implementation of future clinical guidelines and policies.

  20. Designer babies on tap? Medical students' attitudes to pre-implantation genetic screening.

    Science.gov (United States)

    Meisenberg, Gerhard

    2009-03-01

    This paper describes two studies about the determinants of attitudes to pre-implantation genetic screening in a multicultural sample of medical students from the United States. Sample sizes were 292 in study 1 and 1464 in study 2. Attitudes were of an undifferentiated nature, but respondents did make a major distinction between use for disease prevention and use for enhancement. No strong distinctions were made between embryo selection and germ line gene manipulations, and between somatic gene therapy and germ line gene manipulations. Religiosity was negatively associated with acceptance of "designer baby" technology for Christians and Muslims but not Hindus. However, the strongest and most consistent influence was an apparently moralistic stance against active and aggressive interference with natural processes in general. Trust in individuals and institutions was unrelated to acceptance of the technology, indicating that fear of abuse by irresponsible individuals and corporations is not an important determinant of opposition.

  1. Genomic DNA methylation patterns in bovine preimplantation embryos derived from in vitro fertilization

    Institute of Scientific and Technical Information of China (English)

    HOU Jian; LIU Lei; LEI TingHua; CUI XiuHong; AN XiaoRong; CHEN YongFu

    2007-01-01

    By using the approach of immunofluorescence staining with an antibody against 5-methylcytosine (5MeC), the present study detected the DNA methylation patterns of bovine zygotes and preimplantation embryos derived from oocyte in vitro maturation (IVM), in vitro fertilization (IVF) and embryo in vitro culture (IVC). The results showed that: a) paternal-specific demethylation occurred in 61.5% of the examined zygotes, while 34.6% of them showed no demethylation; b) decreased methylation level was observed after the 8-cell stage and persisted through the morula stage, however methylation levels were different between blastomeres within the same embryos; c) at the blastocyst stage, the methylation level was very low in inner cell mass, but high in trophectoderm cells. The present study suggests, at least partly, that IVM/IVF/IVC may have effects on DNA methylation reprogramming of bovine zygotes and early embryos.

  2. Polar body biopsy: a viable alternative to preimplantation genetic diagnosis and screening.

    Science.gov (United States)

    Montag, M; van der Ven, K; Rösing, B; van der Ven, H

    2009-01-01

    Polar body diagnosis (PBD) is a diagnostic method for the indirect genetic analysis of oocytes. Polar bodies are by-products of the meiotic cell cycle, which have no influence on further embryo development. The biopsy of polar bodies can be accomplished either by zona drilling or laser drilling within a very short time period. However, the paternal contribution to the genetic constitution of the developing embryo cannot be diagnosed by PBD. The major application of PBD is the detection of maternally derived chromosomal aneuploidies and translocations in oocytes. For these indications, PBD may offer a viable alternative to blastomere biopsy as the embryo's integrity remains unaffected, in contrast to preimplantation genetic diagnosis (PGD) by blastomere biopsy. The rapid pace of developments in the field of molecular diagnostics will also influence the advantages of PBD, and probably allow more general diagnostic applications in the future.

  3. Soluble monomers, dimers and HLA-G-expressing extracellular vesicles: the three dimensions of structural complexity to use HLA-G as a clinical biomarker.

    Science.gov (United States)

    Nardi, F da Silva; König, L; Wagner, B; Giebel, B; Santos Manvailer, L F; Rebmann, V

    2016-09-01

    The HLA-G molecule belongs to the family of nonclassical human leukocyte antigen (HLA) class I. At variance to classical HLA class I, HLA-G displays (i) a low number of nucleotide variations within the coding region, (ii) a high structural diversity, (iii) a restricted peptide repertoire, (iv) a limited tissue distribution and (v) strong immune-suppressive properties. The physiological HLA-G surface expression is restricted to the maternal-fetal interface and to immune-privileged adult tissues. Soluble forms of HLA-G (sHLA-G) are detectable in various body fluids. Cellular activation and pathological processes are associated with an aberrant or a neo-expression of HLA-G/sHLA-G. Functionally, HLA-G and its secreted forms are considered to be key players in the induction of short- and long-term tolerance. Thus, its unique expression profile and tolerance-inducing functions render HLA-G/sHLA-G an attractive biomarker to monitor the systemic health/disease status and disease activity/progression for clinical approaches in disease management and treatments. Here, we place emphasis on (i) the current status of the tolerance-inducing functions by HLA-G/sHLA-G, (ii) the current complexity to implement this molecule as a meaningful clinical biomarker regarding the three dimensions of structural diversity (monomers, dimers and HLA-G-expressing extracellular vesicles) with its functional implications, and (iii) novel and future approaches to detect and quantify sHLA-G structures and functions.

  4. Peptide binding predictions for HLA DR, DP and DQ molecules

    DEFF Research Database (Denmark)

    Wang, P.; Sidney, J.; Kim, Y.

    2010-01-01

    a significant gap in knowledge as HLA DP and DQ molecules are presumably equally important, and have only been studied less because they are more difficult to handle experimentally. RESULTS: In this study, we aimed to narrow this gap by providing a large scale dataset of over 17,000 HLA-peptide binding......BACKGROUND: MHC class II binding predictions are widely used to identify epitope candidates in infectious agents, allergens, cancer and autoantigens. The vast majority of prediction algorithms for human MHC class II to date have targeted HLA molecules encoded in the DR locus. This reflects...... their performance. CONCLUSION: We found that 1) prediction methodologies developed for HLA DR molecules perform equally well for DP or DQ molecules. 2) Prediction performances were significantly increased compared to previous reports due to the larger amounts of training data available. 3) The presence...

  5. Pacific Islanders and Amerindian relatedness according to HLA ...

    African Journals Online (AJOL)

    human genetic system accounting for 9,438 alleles; this is most useful for ..... to yellow colours mean a gradient of HLA relatedness according to geography. ..... Definition of a new DRB1 allele and distribution of DRB1 gene frequencies.

  6. The difference of ELISA and LABScreen in detecting HLA antibodies

    Institute of Scientific and Technical Information of China (English)

    吴萍萍

    2013-01-01

    Objective To compare the difference of ELISA and LABScreen in detecting HLA antibodies and evaluate their effects on allograft rejection.Methods Consecutive patients undergoing kidney transplantion from November,2008 to December,2009 in the First Affiliated Hospital

  7. Distinct roles of ROCK1 and ROCK2 during development of porcine preimplantation embryos.

    Science.gov (United States)

    Zhang, Jin Yu; Dong, Huan Sheng; Oqani, Reza K; Lin, Tao; Kang, Jung Won; Jin, Dong Il

    2014-07-01

    Cell-to-cell contact mediated by cell adhesion is fundamental to the compaction process that ensures blastocyst quality during embryonic development. In this study, we first showed that Rho-associated coiled-coil protein kinases (ROCK1 and ROCK2) were expressed both in porcine oocytes and IVF preimplantation embryos, playing different roles in oocytes maturation and embryo development. The amount of mRNA encoding ROCK1 and the protein concentration clearly increased between the eight-cell and morula stages, but decreased significantly when blastocysts were formed. Conversely, ROCK2 was more abundant in the blastocyst compared with other embryonic stages. Moreover, immunostaining showed that ROCK1 protein distribution changed as the embryo progressed through cleavage and compaction to the morula stage. Initially, the protein was predominantly associated with the plasma membrane but later became cytoplasmic. By contrast, ROCK2 protein was localized in both the cytoplasm and the spindle rotation region during oocyte meiosis, but in the cytoplasm and nucleus as the embryo developed. In addition, ROCK2 was present in the trophectoderm cells of the blastocyst. Treatment with 15 μM Y27632, a specific inhibitor of ROCKs, completely blocked further development of early four-cell stage embryos. Moreover, we did not detect the expression of ROCK1 but did detect ROCK2 expression in blastocysts. Moreover, lysophosphatidic acid an activator of ROCKs significantly improved the rates of blastocyst formation. These data demonstrate that ROCKs are required for embryo development to the blastocyst stage. Together, our results indicate that ROCK1 and ROCK2 may exert different biological functions during the regulation of compaction and in ensuring development of porcine preimplantation embryos to the blastocyst stage.

  8. Identification of chromosomal errors in human preimplantation embryos with oligonucleotide DNA microarray.

    Directory of Open Access Journals (Sweden)

    Lifeng Liang

    Full Text Available A previous study comparing the performance of different platforms for DNA microarray found that the oligonucleotide (oligo microarray platform containing 385K isothermal probes had the best performance when evaluating dosage sensitivity, precision, specificity, sensitivity and copy number variations border definition. Although oligo microarray platform has been used in some research fields and clinics, it has not been used for aneuploidy screening in human embryos. The present study was designed to use this new microarray platform for preimplantation genetic screening in the human. A total of 383 blastocysts from 72 infertility patients with either advanced maternal age or with previous miscarriage were analyzed after biopsy and microarray. Euploid blastocysts were transferred to patients and clinical pregnancy and implantation rates were measured. Chromosomes in some aneuploid blastocysts were further analyzed by fluorescence in-situ hybridization (FISH to evaluate accuracy of the results. We found that most (58.1% of the blastocysts had chromosomal abnormalities that included single or multiple gains and/or losses of chromosome(s, partial chromosome deletions and/or duplications in both euploid and aneuploid embryos. Transfer of normal euploid blastocysts in 34 cycles resulted in 58.8% clinical pregnancy and 54.4% implantation rates. Examination of abnormal blastocysts by FISH showed that all embryos had matching results comparing microarray and FISH analysis. The present study indicates that oligo microarray conducted with a higher resolution and a greater number of probes is able to detect not only aneuploidy, but also minor chromosomal abnormalities, such as partial chromosome deletion and/or duplication in human embryos. Preimplantation genetic screening of the aneuploidy by DNA microarray is an advanced technology used to select embryos for transfer and improved embryo implantation can be obtained after transfer of the screened normal

  9. Segmental sandwich osteotomy of the posterior mandible in pre-implant surgery - A systematic review

    Science.gov (United States)

    Zografos, Ioannis; Tzermpos, Fotios; Iatrou, Ioannis

    2017-01-01

    Background The rehabilitation of the atrophic posterior mandible with dental implants often requires bone augmentation procedures. The aim of the present study is the systematic review of the literature concerning the success rate of Segmental Sandwich Osteotomy (SSO) of the posterior mandible in pre-implant surgery. Material and Methods Systematic review of all clinical cases and clinical studies of SSO of the posterior mandible in pre-implant surgery with a minimum follow-up of 6 months after implant loading was performed, based on specific inclusion and exclusion criteria. The search strategy involved searching the electronic databases of MEDLINE, EMBASE, COCHRANE LIBRARY, Clinical Trials (www.clinicaltrials.gov) and National Research Register (www.controlled-trials.com), supplemented by a manual search, in August 2015. In every study, the intervention characteristics and the outcome were recorded. Results Out of the 756 initial results, only 17 articles fulfilled the predetermined inclusion and exclusion criteria. They consisted of 9 retrospective case reports or series and 8 prospective randomized clinical trials. Overall, the studies included 174 patients. In these patients, 214 SSO augmentation procedures were performed in the posterior mandible and 444 implants were placed. The follow-up period after implant loading ranged between 8 months and 5.5 years. The success rate of SSO ranged between 90% and 100%. The implant survival during the follow-up period ranged between 90.9% and 100%. Conclusions Segmental Sandwich Osteotomy should be considered as a well documented technique for the rehabilitation of the atrophic posterior mandible, with long-term postsurgical follow-up. The success rates are very high, as well as the survival of the dental implants placed in the augmented area. Key words:Segmental osteotomy, dental implant, mandible, inlay graft. PMID:27918747

  10. HLA-genotyping of clinical specimens using Ion Torrent-based NGS.

    Science.gov (United States)

    Barone, Jonathan C; Saito, Katsuyuki; Beutner, Karl; Campo, Maria; Dong, Wei; Goswami, Chirayu P; Johnson, Erica S; Wang, Zi-Xuan; Hsu, Susan

    2015-12-01

    We have evaluated and validated the NXType™ workflow (One Lambda, Inc.) and the accompanying TypeStream™ software on the Ion Torrent Next Generation Sequencing (NGS) platform using a comprehensive testing panel. The panel consisted of 285 genomic DNA (gDNA) samples derived from four major ethnic populations and contained 59 PT samples and 226 clinical specimens. The total number of alleles from the six loci interrogated by NGS was 3420. This validation panel provided a wide range of HLA sequence variations including many rare alleles, new variants and homozygous alleles. The NXType™ system (reagents and software) was able to correctly genotype the vast majority of these specimens. The concordance rate between SBT-derived genotypes and those generated by TypeStream™ auto-analysis ranged from 99.5% to 99.8% for the HLA-A, B, C, DRB1 and DQB1 loci, and was 98.9% for HLA-DPB1. A strategy for data review was developed that would allow correction of most of the few remaining typing errors. The entire NGS workflow from gDNA amplification to genotype assignment could be completed within 3 working days. Through this validation study, the limitations and shortcomings of the platform, specific assay system, and software algorithm were also revealed for further evaluation and improvement.

  11. Detailed examination of HLA antibody development on renal allograft failure and function.

    Science.gov (United States)

    Zhu, Lan; Lee, Po-Chang; Everly, Matthew J; Terasaki, Paul I

    2008-01-01

    This is a long-term retrospective case-control study. Serial sera were collected over 17 years (1991-2008) from two groups comprised of 29 patients with allograft failure (250 sera) and 25 controls with functioning grafts (305 sera), each control matched by transplant date to one failure-group patient, and all patients tested with single antigen beads. The median follow-up for failure-group patients was 7.3 +/- 4.7 years and 11.8 +/- 4.4 years for controls. HLA alloantibodies appeared in 28 of the 29 failure-group patients (97%) and in 12 of the 25 controls (48%) (p failure (p = 0.001, p = 0.01). DSA against HLA-DQ antigen was found in 13 of 17 graft-failed patients who had received DQ-incompatible transplants (76%) compared with only one of 11 similarly DQ-mismatched control patients (9%) (p 5000) was higher in graft-failed patients than in graft-functioning patients. The time it took for antibodies to develop also differed between groups. HLA antibodies were formed sooner in the failure group compared with the controls (1.7 versus 3.7 years, P failure group patients developed antibodies within one year while none in the control group did. In conclusion, our study reinforces the observation that circulating de novo HLA alloantibodies predict adverse long-term kidney allograft outcomes. The significant negative impact of all alloantibodies calls for clinicians to monitor patients and implement removal therapy when alloantibody is first detected. This may prove a key step in the ongoing attempt to prevent chronic rejection and prolonging renal allograft survival.

  12. Cross-reactions in the HLA system revealed by red blood cells expressing HLA determinants, with particular reference to cross-reaction between HLA-A2 and B17.

    Science.gov (United States)

    Nordhagen, R

    1983-01-01

    Sera with cytotoxic and haemagglutinating activity towards HLA-A2/28 were also shown to react with red blood cells (RBC) expressing the HLA-B17 antigen determinant. Absorption procedures with white blood cells (WBC) indicated that this was due to an HLA-A2/B17 cross-reaction. Absorption experiments with some other sera which previously had shown cytotoxic and haemagglutinating activity towards different HLA specificities, revealed broad cross-reaction related to HLA-B locus antigens.

  13. Weak association of anti-sperm antibodies and strong association of familial cryptorchidism/infertility with HLA-DRB1polymorphisms in prepubertal Ukrainian boys

    Directory of Open Access Journals (Sweden)

    Chopyak Valentyna

    2011-09-01

    Full Text Available Abstract Background Cryptorchidism is a frequent syndrome occurring in 1-2% of males within the first year of age. Autoimmune reactions, particularly directed to testicular elements and/or spermatozoa have been found to be often associated with cryptorchidism. Therefore we investigated in this study the frequency of HLA class II alleles in order to recognize possible genetic predisposition for antisperm antibodies development in prepubertal boys with diagnosed cryptorchidism in Caucasoid population. Methods Sixty prepubertal boys with cryptorchidism and sixty healthy boys were examined for anti-sperm antibodies by indirect immunobead test as well as for their HLA-DRB1 and -DQB1 alleles using DNA obtained from peripheral blood leukocytes. The typing of HLA-DRB1 and -DQB1 was performed by using PCR-SSP low resolution method. Results Allele frequencies of HLA-DRB1 and HLA-DQB1 did not differ between boys with cryptorchidism and control boys. However, weakly significant differences in DRB1*04 (p corrected = 0.0475 and DQB1*06 (p corrected = 0.0385 were seen between cryptorchid patients with and without AsA, but none of these two patient groups differed significantly in HLA class II frequencies from controls except for AsA-negatives and HLA-DQB1*06 (p corrected = 0.0247. On the other hand, comparison of cryptorchid boys with familial cryptorchidism and/or infertility to control boys revealed highly significant (p corrected = 0.0006 difference in HLA-DRB*11 frequency, whereas boys with sporadic cryptorchidism did not differ from control. A much weaker, but still significant difference in DRB*11 frequency was also observed between boys with bilateral cryptorchidism and controls (p corrected = 0.037, whereas patients with unilateral cryptorchidism were not different from control in frequency of any HLA-DRB1 or -DQB1 allele tested. Conclusions Predisposition to produce anti-sperm antibodies seems to be only weakly associated with HLA class II genes

  14. Cutting Edge: Allele-specific and peptide-dependent interactions between KIR3DL1 and HLA-A and HLA-B.

    Science.gov (United States)

    Thananchai, Hathairat; Gillespie, Geraldine; Martin, Maureen P; Bashirova, Arman; Yawata, Nobuyo; Yawata, Makoto; Easterbrook, Philippa; McVicar, Daniel W; Maenaka, Katsumi; Parham, Peter; Carrington, Mary; Dong, Tao; Rowland-Jones, Sarah

    2007-01-01

    Although it is clear that KIR3DL1 recognizes Bw4(+) HLA-B, the role of Bw4(+) HLA-A allotypes as KIR3DL1 ligands is controversial. We therefore examined the binding of tetrameric HLA-A and -B complexes, including HLA*2402, a common Bw4(+) HLA-A allotype, to KIR3DL1*001, *005, *007, and *1502 allotypes. Only Bw4(+) tetramers bound KIR3DL1. Three of four HLA-A*2402 tetramers bound one or more KIR3DL1 allotypes and all four KIR3DL1 allotypes bound to one or more HLA-A*2402 tetramers, but with different binding specificities. Only KIR3DL1*005 bound both HLA-A*2402 and HLA-B*5703 tetramers. HLA-A*2402-expressing target cells were resistant to lysis by NK cells expressing KIR3DL1*001 or *005. This study shows that HLA-A*2402 is a ligand for KIR3DL1 and demonstrates how the binding of KIR3DL1 to Bw4(+) ligands depends upon the bound peptide as well as HLA and KIR3DL1 polymorphism.

  15. Pre-implantation implantable cardioverter defibrillator concerns and Type D personality increase the risk of mortality in patients with an implantable cardioverter defibrillator

    DEFF Research Database (Denmark)

    Pedersen, Susanne S.; van den Broek, Krista C; Erdman, Ruud A M;

    2010-01-01

    Little is known about the influence of psychological factors on prognosis in implantable cardioverter defibrillator (ICD) patients. We examined the influence of the distressed personality (Type D) and pre-implantation device concerns on short-term mortality in ICD patients.......Little is known about the influence of psychological factors on prognosis in implantable cardioverter defibrillator (ICD) patients. We examined the influence of the distressed personality (Type D) and pre-implantation device concerns on short-term mortality in ICD patients....

  16. Types of HLA in the bladder transitional cell carcinoma (TCC).

    Science.gov (United States)

    Yılmaz, Erkan; Uğur Özalp, Ali; Cekmen, Arman; Eren, Bülent; Onal, Bülent; Akkuş, Emre; Erdoğan, Ergun

    2013-02-01

    HLA plays a complementary role in the interaction between tumor and body immunology. The aim of this study was to determine the existence of the association between the HLA system and transitional cell carcinoma (TCC). Using standard micro-lymphocytotoxic method of Terasaki, HLA-A, B, DR and DQ antigen types of 30 patients with TCC of the bladder were compared with the control group (30 healthy people). In the TCC patient group, HLA -DQ6(1) and HLA -DQ7(3) antigens were detected with a significantly higher frequency than in the control group (p=0.018 and p=0.038, respectively), whereas HLA-A10, B4, DR53 and DQ1 antigens were detected with significantly higher frequency in the control group (p less 0.05 in all). It suggests that patients who had the antigens detected were at higher risk of TCC, and the ones who had the antigens displaying protective features as were detected in the control group, were at lesser risk.

  17. Activating KIR/HLA complexes in classic Kaposi's Sarcoma

    Directory of Open Access Journals (Sweden)

    Guerini Franca R

    2012-04-01

    Full Text Available Abstract Background Classic Kaposi's Sarcoma (cKS is a rare vascular tumor associated with Human Herpesvirus 8 (KSHV infection, nevertheless not all KSHV-infected individuals have cKS. Objective We investigated whether particular KIR/HLA receptor/ligand genotypes would be preferentially present in KSHV-infected and uninfected individuals who have or have not developed cKS. Methods KIR/HLA genotypes were analyzed by molecular genotyping in 50 KSHV-infected individuals who did or did not have cKS and in 33 age-and sex-matched KSHV seronegative individuals. Results There was no association of individual KIR, HLA or receptor ligand combinations with KSHV infection. However, activating KIR and KIR/HLA genotypes were significantly more frequent in cKS cases, specifically KIR3DS1, KIR2DS1, and KIR2DS1 with its HLA-C2 ligand. Conclusion A nonspecific inflammatory response triggered by activation of NK cells upon KIR-HLA interaction could be associated with the pathogenesis of KS.

  18. Genetic diversity of the KIR/HLA system and susceptibility to hepatitis C virus-related diseases.

    Directory of Open Access Journals (Sweden)

    Valli De Re

    Full Text Available The variability in the association of host innate immune response to Hepatitis C virus (HCV infection requires ruling out the possible role of host KIR and HLA genotypes in HCV-related disorders: therefore, we therefore explored the relationships between KIR/HLA genotypes and chronic HCV infection (CHC as they relate to the risk of HCV-related hepatocarcinoma (HCC or lymphoproliferative disease progression.We analyzed data from 396 HCV-positive patients with CHC (n = 125, HCC (118, and lymphoproliferative diseases (153, and 501 HCV-negative patients. All were HIV and HBV negative. KIR-SSO was used to determine the KIR typing. KIR2DL5 and KIR2DS4 variants were performed using PCR and GeneScan analysis. HLA/class-I genotyping was performed using PCR-sequence-based typing. The interaction between the KIR gene and ligand HLA molecules was investigated. Differences in frequencies were estimated using Fisher's exact test, and Cochran-Armitage trend test. The non-random association of KIR alleles was estimated using the linkage disequilibrium test. We found an association of KIR2DS2/KIR2DL2 genes, with the HCV-related lymphoproliferative disorders. Furthermore, individuals with a HLA-Bw6 KIR3DL1+ combination of genes showed higher risk of developing lymphoma than cryoglobulinemia. KIR2DS3 gene was found to be the principal gene associated with chronic HCV infection, while a reduction of HLA-Bw4 + KIR3DS1+ was associated with an increased risk of developing HCC.Our data highlight a role of the innate-system in developing HCV-related disorders and specifically KIR2DS3 and KIR2D genes demonstrated an ability to direct HCV disease progression, and mainly towards lymphoproliferative disorders. Moreover the determination of KIR3D/HLA combination of genes direct the HCV progression towards a lymphoma rather than an hepatic disease. In this contest IFN-α therapy, a standard therapy for HCV-infection and lymphoproliferative diseases, known to be able to

  19. Genetic Diversity of the KIR/HLA System and Susceptibility to Hepatitis C Virus-Related Diseases

    Science.gov (United States)

    De Re, Valli; Caggiari, Laura; De Zorzi, Mariangela; Repetto, Ombretta; Zignego, Anna Linda; Izzo, Francesco; Tornesello, Maria Lina; Buonaguro, Franco Maria; Mangia, Alessandra; Sansonno, Domenico; Racanelli, Vito; De Vita, Salvatore; Pioltelli, Pietro; Vaccher, Emanuela; Beretta, Massimiliano; Mazzaro, Cesare; Libra, Massimo; Gini, Andrea; Zucchetto, Antonella; Cannizzaro, Renato; De Paoli, Paolo

    2015-01-01

    Background The variability in the association of host innate immune response to Hepatitis C virus (HCV) infection requires ruling out the possible role of host KIR and HLA genotypes in HCV-related disorders: therefore, we therefore explored the relationships between KIR/HLA genotypes and chronic HCV infection (CHC) as they relate to the risk of HCV-related hepatocarcinoma (HCC) or lymphoproliferative disease progression. Methods and Findings We analyzed data from 396 HCV-positive patients with CHC (n = 125), HCC (118), and lymphoproliferative diseases (153), and 501 HCV-negative patients. All were HIV and HBV negative. KIR-SSO was used to determine the KIR typing. KIR2DL5 and KIR2DS4 variants were performed using PCR and GeneScan analysis. HLA/class-I genotyping was performed using PCR-sequence-based typing. The interaction between the KIR gene and ligand HLA molecules was investigated. Differences in frequencies were estimated using Fisher’s exact test, and Cochran-Armitage trend test. The non-random association of KIR alleles was estimated using the linkage disequilibrium test. We found an association of KIR2DS2/KIR2DL2 genes, with the HCV-related lymphoproliferative disorders. Furthermore, individuals with a HLA-Bw6 KIR3DL1+ combination of genes showed higher risk of developing lymphoma than cryoglobulinemia. KIR2DS3 gene was found to be the principal gene associated with chronic HCV infection, while a reduction of HLA-Bw4 + KIR3DS1+ was associated with an increased risk of developing HCC. Conclusions Our data highlight a role of the innate-system in developing HCV-related disorders and specifically KIR2DS3 and KIR2D genes demonstrated an ability to direct HCV disease progression, and mainly towards lymphoproliferative disorders. Moreover the determination of KIR3D/HLA combination of genes direct the HCV progression towards a lymphoma rather than an hepatic disease. In this contest IFN-α therapy, a standard therapy for HCV-infection and lymphoproliferative

  20. HLA-A, HLA-B, HLA-DRB1 allele and haplotype frequencies in 6384 umbilical cord blood units and transplantation matching and engraftment statistics in the Zhejiang cord blood bank of China.

    Science.gov (United States)

    Wang, F; He, J; Chen, S; Qin, F; Dai, B; Zhang, W; Zhu, F M; Lv, H J

    2014-02-01

    Umbilical cord blood (UCB) is a widely accepted source of progenitor cells, and now, many cord blood banks were established. Here, we analysed the HLA-A, HLA-B and HLA-DRB1 allele and haplotype frequencies, HLA matching possibilities for searching potential donors and outcome of UCB transplantations in Zhejiang cord blood bank of China. A total of 6384 UCB units were characterized for 17 HLA-A, 30 HLA-B and 13 HLA-DRB1 alleles at the first field resolution level. Additionally, B*14, B*15 and B*40 were typed to the second field level. A total of 1372 distinct A-B-DRB1 haplotypes were identified. The frequencies of 7 haplotypes were more than 1%, and 439 haplotypes were blood bank of Zhejiang province. These data can help to select potential UCB donors for transplantation and used to assess the scale of new cord blood banking endeavours.

  1. The Genetic Profile from HLA and Non-HLA Loci Allows Identification of Atypical Type 2 Diabetes Patients

    OpenAIRE

    Matias Fabregat; Mariana Fernandez; Gerardo Javiel; Graciela Vitarella; Adriana Mimbacas

    2015-01-01

    The complex diagnosis and treatment of diabetes highlight the need for markers to define how to monitor patients correctly during the course of their disease. Different studies demonstrate the existence of patients who cannot be clearly classified. We have previously shown that it is possible to differentiate “atypical diabetic patients” based on genotyping the HLA. In this work we show that the analysis of non-HLA related to type 1 diabetes in the INS-VNTR, SNP rs689...

  2. The conundrum of HLA-DRB1*14:01/*14:54 and HLA-DRB3*02:01/*02:02 mismatches in unrelated hematopoietic SCT.

    Science.gov (United States)

    Pasi, A; Crocchiolo, R; Bontempelli, M; Carcassi, C; Carella, G; Crespiatico, L; Garbarino, L; Mascaretti, L; Mazzi, B; Mazzola, G; Miotti, V; Porfirio, B; Tagliaferri, C; Valentini, T; Vecchiato, C; Fleischhauer, K; Sacchi, N; Bosi, A; Martinetti, M

    2011-07-01

    Uncertainty still exists on the role of polymorphisms outside the HLA-DRB1 binding site or inside the HLA-DRB3 binding groove in unrelated hematopoietic SCT (HSCT). The ideal model to solve the conundrum consists of the transplants mismatched for HLA-DRB1*14:01/*14:54 and/or for HLA-DRB3*02:01/*02:02. A task force was set up in Italy to recruit transplanted pairs defined as HLA-DRB1*14:01 before 2006, the year crucial for the proper definition of the HLA-DRB1*14:54 allele in molecular biology. Out of 2723 unrelated pairs, 189 transplanted in Italy from 1995 to 2006 were HLA-DRB1*14:01 positive; 103/189 pairs with good historical DNA were retyped for HLA-DRB1*14 and HLA-DRB3 at-high resolution level; 31/103 pairs had HLA-DRB1*14 and/or HLA-DRB3 mismatched; 99/103, having complete clinical data, underwent statistical analysis for OS, TRM, disease-free survival and acute and chronic GvHD. No significant involvement of HLA-DRB1*14:01/*14:54 or HLA-DRB3*02:01/*02:02 mismatches was found, either alone or combined. Our findings suggest that disparities at exon 3 of the HLA-DRB1 gene seem unlikely to influence the outcome after HSCT. The same may be envisaged for HLA-DRB3(*)02:01 and (*)02:02 alleles which, although differing in the Ag binding site, seem unable to modulate an appreciable immune response in an HSCT setting.

  3. Extended HLA haplotypes in a Carib Amerindian population: the Yucpa of the Perija Range.

    Science.gov (United States)

    Layrisse, Z; Guedez, Y; Domínguez, E; Paz, N; Montagnani, S; Matos, M; Herrera, F; Ogando, V; Balbas, O; Rodríguez-Larralde, A

    2001-09-01

    Eleven MHC loci haplotypes have been defined among a Carib speaking Amerindian population; the Yucpa, inhabiting the northern section of the Perija Range, on the limits between Colombia and Venezuela. This tribe has been known with the name of "Motilones mansos" and is located close to the Chibcha-Paeze speaking Bari or "Motilones bravos." Seventy-three full blooded Yucpa living at the villages of Aroy, Marewa, and Peraya, were selected using a genealogy previously collected by an anthropologist and tested for Bf-C4AB complement allotypes and by serology, high resolution PCR-SSO and SBT typing for HLA class 1 and class 2 alleles. Combinations of 6 HLA-A, 6 HLA-B, 5 HLA-C, 1 Bf, 3 C4AB, 3 DQA1, 3DQB1 and 2 DPA1 and 2 DPB1 alleles present in this population originate 17 different haplotypes, 3 of which represent 63% of the haplotypic constitution of the tribe. The presence of 13 individuals homozygous for 11-loci haplotypes corroborates the existence of the following allelic combinations: DRB1*0411 DQA1*03011 DQB1*0302 DPA1*01 DPB1*0402 with HLA-A*6801 C*0702 B*3909 BfS C4 32 (f = 0.3372) or with A*0204 C*0702 B*3905 (f = 0.1977) and a third haplotype which differs only in DRB1*0403 and A*2402 (f = 0.0930). The results demonstrate the isolation of the tribe and the existence of high frequencies of a reduced number of "Amerindian" ancestral and novel class 1 and class 2 alleles (B*1522, DRB1*0807) with significant linkage disequilibria. These results will be useful to test the hypothesis that differentiation of Amerindian tribal groups will have to rely on haplotypes and micropolymorphism rather than allelic lineage frequencies due to the uniformity shown thus far by the putative descendants of the original Paleo-Indians.

  4. Next-Generation Sequencing of the HLA locus: Methods and impacts on HLA typing, population genetics and disease association studies.

    Science.gov (United States)

    Carapito, Raphael; Radosavljevic, Mirjana; Bahram, Seiamak

    2016-11-01

    The human Major Histocompatibility Complex, known as the "Human Leukocyte Antigen (HLA)", could be defined as a "super locus" (historically called "supergene") governing the adaptive immune system in vertebrates. It also harbors genes involved in innate immunity. HLA is the most gene-dense, polymorphic and disease-associated region of the human genome. It is of critical medical relevance given its involvement in the fate of the transplanted organs/tissues and its association with more than 100 diseases. However, despite these important roles, comprehensive sequence analysis of the 4 megabase HLA locus has been limited due to technological challenges. Thanks to recent improvements in Next-Generation Sequencing (NGS) technologies however, one is now able to handle the peculiarities of the MHC notably the tight linkage disequilibrium between genes as well as their high degree of polymorphism (and hence heterozygosity). Increased read lengths, throughput, accuracy, as well as development of new bioinformatics tools now enable to efficiently generate complete and accurate full-length HLA haplotypes without phase ambiguities. The present report reviews current NGS approaches to capture, sequence and analyze HLA genes and loci. The impact of these new methodologies on various applications including HLA typing, population genetics and disease association studies are discussed. Copyright © 2016 American Society for Histocompatibility and Immunogenetics. Published by Elsevier Inc. All rights reserved.

  5. HLA and epidermolysis bullosa: evidence for independent assortment of Weber-Cockayne subtype of epidermolysis bullosa and HLA complex.

    Science.gov (United States)

    Vaidya, S; Tyring, S K; Feldkamp, M; Johnson, L B; Fine, J D

    1991-05-01

    The purpose of this study was to examine the genetic linkage (but not the association) between HLA complex and Weber-Cockayne Subtype of epidermolysis bullosa (EBS-WC). We HLA typed 44 members of three multi-generation families in which 24 members have the clinical evidence of EBS-WC. The patterns of inheritance of various HLA haplotypes and the disease were mathematically analyzed to estimate frequency of recombination (i.e. genetic distance) between HLA complex and the disease by calculating Lod Scores for each family separately as well as all for three families combined. Our results show that only one family had a positive Lod Score. The Lod Scores for the remaining two families as well as the combined Lod Score for all three families were negative. These data suggest that odds are against the genetic linkage between HLA complex and Weber-Cockayne Subtype of epidermolysis bullosa and in favor of independent assortment of the disease and HLA complex.

  6. HLA-A*01:03, HLA-A*24:02, HLA-B*08:01, HLA-B*27:05, HLA-B*35:01, HLA-B*44:02, and HLA-C*07:01 Monochain Transgenic/H-2 Class I Null Mice

    DEFF Research Database (Denmark)

    Boucherma, Rachid; Kridane-Miledi, Hédia; Bouziat, Romain;

    2013-01-01

    surface expression of several transgenes was markedly reduced in recipient mice that coexpressed endogenous H-2 class I molecules, substantial surface expression of all human transgenes was observed in mice lacking H-2 class I molecules. In these HLA monochain transgenic/H-2 class I null mice, we observed...

  7. Association of HLA genotypes with phenobarbital hypersensitivity in children.

    Science.gov (United States)

    Manuyakorn, Wiparat; Mahasirimongkol, Surakameth; Likkasittipan, Plernpit; Kamchaisatian, Wasu; Wattanapokayakit, Sukanya; Inunchot, Wimala; Visudtibhan, Anannit; Wichukchinda, Nuanjun; Benjaponpitak, Suwat

    2016-10-01

    Phenobarbital hypersensitivity is one of the common drug hypersensitivity syndromes in children. Clinical symptoms of phenobarbital hypersensitivity vary from maculopapular rashes (MPs) to severe cutaneous adverse drug reactions (SCARs) including drug reactions with eosinophilia and systemic symptoms (DRESS), Stevens-Johnson syndrome (SJS), and toxic epidermal necrolysis (TEN). Drug hypersensitivity has been demonstrated to be associated with variations in the HLA genotypes. This study was to investigate the association between the variations of HLA genotypes and phenobarbital hypersensitivity in Thai children. The cases were Thai children, between 0 and 18 years of age, who were diagnosed with phenobarbital hypersensitivity, which included SCARs and MPs. The control patients were Thai children of a corresponding age who had taken phenobarbital for at least 12 weeks without any hypersensitivity reaction. Blood samples were collected for HLA genotyping by using a reverse-sequence-specific oligonucleotide (SSO) probes method. The carrier rates of HLA alleles were compared between 47 cases (27 SCARs and 20 MPs) and 54 controls. The carrier rates of HLA-A*01:01 and HLA-B*13:01 were significantly higher in the phenobarbital-induced SCARs than in the tolerant controls (18.5% vs. 1.85%, p = 0.01, odds ratio [OR] 11.66, 95% confidence interval [CI] 1.21-578.19; 37.04% vs. 11.11%, p = 0.009, OR 4.60, 95%CI 1.29-17.98). There was a trend of a higher carrier rate of HLA-C*06:02 in the phenobarbital-induced SCARs when compared with those in the tolerant controls (29.63% vs. 11.11%, p = 0.059, OR 3.31, 95% CI 0.88-13.31). In contrast to the phenobarbital-induced SCARs, only the HLA-A*01:01 carrier rate in the phenobarbital-induced MPs was significantly higher than those in the tolerant controls (20% vs. 1.85%, p = 0.017, OR 12.69, 95% CI 1.15-661.62). An association between phenobarbital hypersensitivity and HLA-A*01:01 and HLA-B*13:01 has been demonstrated in Thai children

  8. HLA-B27 predicts a more extended disease with increasing age at onset in boys with juvenile idiopathic arthritis

    DEFF Research Database (Denmark)

    Berntson, Lillemor; Damgård, Michael; Andersson-Gäre, Boel

    2008-01-01

    OBJECTIVE: Juvenile idiopathic arthritis (JIA) is a heterogeneous condition with very few clinical and laboratory signs that can help predict the course and severity of the disease in the individual patient. The cell-surface antigen HLA-B27 is well known to be associated with spondyloarthropathies...... to a population-based study as possible. METHODS: We studied an incidence-based cohort of 305 patients collected prospectively in 3 Nordic countries (Sweden, Norway, Denmark). Clinical and serological data of the first 3 years of the disease were collected. RESULTS: HLA-B27 was found to be positive in 25.......5% of the patients, and we found a higher proportion of HLA-B27-positive boys with older age at disease onset (p=0.034). Regression analysis showed a correlation of 0.7 in the HLA-B27-positive boys, pointing to a higher risk of more joint involvement with older age at disease onset. By Fisher's exact test...

  9. HLA-DR-expressing cells and T-lymphocytes in sural nerve biopsies

    DEFF Research Database (Denmark)

    Schrøder, H D; Olsson, T; Solders, G;

    1988-01-01

    was confirmed. HLA-DR expression was found in all biopsies and thus was not restricted to any particular type of neuropathy. The HLA-DR expression appeared to correlate with severity and activity of the neuropathy. HLA-DR-expressing macrophages wrapping myelinated fibers were prominent in primary demyelinating......Thirty-five sural nerve biopsies were stained immunohistochemically for HLA-DR antigen. HLA-DR was expressed on nonmyelinating Schwann cells, macrophages, vascular endothelium, and perineurium. By means of double immunofluorescence staining the identity of the HLA-DR presenting structures...

  10. HLA types in patients with rheumatoid arthritis developing leucopenia after both gold and sulphasalazine treatment.

    OpenAIRE

    Bliddal, H; Eiberg, B; Helin, P; Svejgaard, A.

    1989-01-01

    HLA types, especially HLA-DR3, are associated with the development of toxic reactions in patients with rheumatoid arthritis after treatment with gold or D-penicillamine. In this study, after treatment with sulphasalazine, leucopenia was observed in three patients, who all had a history of leucopenia after previous gold treatment. The HLA types of these patients did not include HLA-DR3; the two patients developing mild leucopenia had HLA-DR2 and the one developing agranulocytosis had HLA-DR4.

  11. HLA-DR polymorphism in a senegalese mandenka population: DNA oligotyping and population genetics of DRB1 specificities

    Energy Technology Data Exchange (ETDEWEB)

    Tiercy, J.M.; Shi-Isaac, X.; Jeannet, M.; Sanchez-Mazas, A.; Langaney, A.; Mach, B.; Excoffier, L.

    1992-09-01

    HLA class II loci are useful markers in human population genetics, because they are extremely variable and because new molecular techniques allow large-scale analysis of DNA allele frequencies. Direct DNA typing by hybridization with sequence-specific oligonucleotide probes (HLA oligotyping) after enzymatic in vitro PCR amplification detects HLA allelic polymorphisms for all class II loci. A detailed HLA-DR oligotyping analysis of 191 individuals from a geographically, culturally, and genetically well-defined western African population, the Mandenkalu, reveals a high degree of polymorphism, with at least 24 alleles and a heterozygosity level of .884 for the DRB1 locus. The allele DRB1[sup *]1304, defined by DNA sequencing of the DRB1 first-domain exon, is the most frequent allele (27.1%). It accounts for an unusually high DR13 frequency, which is nevertheless within the neutral frequency range. The next most frequency specificities are DR11, DR3, and DR8. Among DRB3-encoded alleles, DR52B (DRB3[sup *]02) represents as much as 80.7% of all DR52 halotypes. A survey of HLA-DR specificities in populations from different continents shows a significant positive correlation between genetic and geographic differentiation patterns. A homozygosity test for selective neutrality of DR specificities is not significant for the mandenka population but is rejected for 20 of 24 populations. Observed high heterozygosity levels in tested populations are compatible with an overdominant model with a small selective advantage for heterozygotes. 91 refs., 5 figs., 5 tabs.

  12. Preimplantation biopsy predicts delayed graft function, glomerular filtration rate and long-term graft survival of transplanted kidneys

    Directory of Open Access Journals (Sweden)

    José A. Pedroso

    2016-01-01

    Full Text Available The predictive value of preimplantation biopsies for long-term graft function is often limited by conflicting results. The aim of this study was to evaluate the influence of time-zero graft biopsy histological scores on early and late graft function, graft survival and patient survival, at different time points. We retrospectively analyzed 284 preimplantation biopsies at a single center, in a cohort of recipients with grafts from live and deceased donors (standard and nonstandard, and their impact in posttransplant renal function after a mean follow-up of 7 years (range 1-16. Implantation biopsy score (IBS, a combination score derived from 4 histopathological aspects, was determined from each sample. The correlation with incidence of delayed graft function (DGF, creatinine clearance (1st, 3rd and 5th posttransplant year and graft and patient survival at 1 and 5 years were evaluated. Preimplantation biopsies provided somewhat of a prognostic index of early function and outcome of the transplanted kidney in the short and long term. In the immediate posttransplantation period, the degree of arteriolosclerosis and interstitial fibrosis correlated better with the presence of DGF. IBS values between 4 and 6 were predictive of worst renal function at 1st and 3rd years posttransplant and 5-year graft survival. The most important histological finding, in effectively transplanted grafts, was the grade of interstitial fibrosis. Patient survival was not influenced by IBS. Higher preimplantation biopsy scores predicted an increased risk of early graft losses, especially primary nonfunction. Graft survival (at 1st and 5th years after transplant but not patient survival was predicted by IBS.

  13. Identification of genes induced by the conceptus in the bovine endometrium during the pre-implantation period

    OpenAIRE

    Klein, Claudia

    2006-01-01

    An intact embryo-maternal communication in the pre-implantation period is particularly critical for establishment of pregnancy and early embryonic losses have been identified as the major cause of reproductive failure in cattle. Thus, to gain deeper insight into this complex embryo-maternal crosstalk, a combination of subtracted cDNA libraries and cDNA array hybridization was applied to identify mRNAs differentially regulated genes in the bovine endometrium by the presence of a conceptus. One...

  14. Comparison of methods for in-house screening of HLA-B*57:01 to prevent abacavir hypersensitivity in HIV-1 care.

    Science.gov (United States)

    De Spiegelaere, Ward; Philippé, Jan; Vervisch, Karen; Verhofstede, Chris; Malatinkova, Eva; Kiselinova, Maja; Trypsteen, Wim; Bonczkowski, Pawel; Vogelaers, Dirk; Callens, Steven; Ruelle, Jean; Kabeya, Kabamba; De Wit, Stephane; Van Acker, Petra; Van Sandt, Vicky; Emonds, Marie-Paule; Coucke, Paul; Sermijn, Erica; Vandekerckhove, Linos

    2015-01-01

    Abacavir is a nucleoside reverse transcriptase inhibitor used as part of combination antiretroviral therapy in HIV-1-infected patients. Because this drug can cause a hypersensitivity reaction that is correlated with the presence of the HLA-B*57:01 allotype, screening for the presence of HLA-B*57:01 is recommended before abacavir initiation. Different genetic assays have been developed for HLA-B*57:01 screening, each with specific sensitivity, turnaround time and assay costs. Here, a new real-time PCR (qPCR) based analysis is described and compared to sequence specific primer PCR with capillary electrophoresis (SSP PCR CE) on 149 patient-derived samples, using sequence specific oligonucleotide hybridization combined with high resolution SSP PCR as gold standard. In addition to these PCR based methods, a complementary approach was developed using flow cytometry with an HLA-B17 specific monoclonal antibody as a pre-screening assay to diminish the number of samples for genetic testing. All three assays had a maximum sensitivity of >99. However, differences in specificity were recorded, i.e. 84.3%, 97.2% and >99% for flow cytometry, qPCR and SSP PCR CE respectively. Our data indicate that the most specific and sensitive of the compared methods is the SSP PCR CE. Flow cytometry pre-screening can substantially decrease the number of genetic tests for HLA-B*57:01 typing in a clinical setting.

  15. Comparison of methods for in-house screening of HLA-B*57:01 to prevent abacavir hypersensitivity in HIV-1 care.

    Directory of Open Access Journals (Sweden)

    Ward De Spiegelaere

    Full Text Available Abacavir is a nucleoside reverse transcriptase inhibitor used as part of combination antiretroviral therapy in HIV-1-infected patients. Because this drug can cause a hypersensitivity reaction that is correlated with the presence of the HLA-B*57:01 allotype, screening for the presence of HLA-B*57:01 is recommended before abacavir initiation. Different genetic assays have been developed for HLA-B*57:01 screening, each with specific sensitivity, turnaround time and assay costs. Here, a new real-time PCR (qPCR based analysis is described and compared to sequence specific primer PCR with capillary electrophoresis (SSP PCR CE on 149 patient-derived samples, using sequence specific oligonucleotide hybridization combined with high resolution SSP PCR as gold standard. In addition to these PCR based methods, a complementary approach was developed using flow cytometry with an HLA-B17 specific monoclonal antibody as a pre-screening assay to diminish the number of samples for genetic testing. All three assays had a maximum sensitivity of >99. However, differences in specificity were recorded, i.e. 84.3%, 97.2% and >99% for flow cytometry, qPCR and SSP PCR CE respectively. Our data indicate that the most specific and sensitive of the compared methods is the SSP PCR CE. Flow cytometry pre-screening can substantially decrease the number of genetic tests for HLA-B*57:01 typing in a clinical setting.

  16. HLA-KIR Interactions and Immunity to Viral Infections

    Directory of Open Access Journals (Sweden)

    Masoud Sabouri Ghannad

    2014-02-01

    Full Text Available Host genetic factors play a central role in determining the clinical phenotype of human diseases. Association between two polymorphic loci in human genome, human leukocyte antigen (HLA and killer cell immunoglobulin-like receptors (KIRs, and genetically complex infectious disease, particularly those of viral etiology, have been historically elusive. Hence, defining the influence of genetic diversity in HLA and KIRs on the outcome of viral infections has been extensively started in clinically well-defined cohort studies. HLA genes encode molecules which present antigenic peptide fragments to T lymphocytes as central players in adaptive immunity against infectious diseases. KIRs are expressed on natural killer cells which perform a crucial role in innate immunity to pathogen infection. The effector functions of NK cells such as direct killing of infected cells, cytokine production, and cross-talk with adaptive immune system depend on activation of NK cells, which is determined by their surface receptors. Among these receptors, KIRs, which interact with HLA class I, are mainly inhibitory and exhibit substantial genetic diversity. An extensive body of association studies indicates a role for HLA–KIRs interactions in infectious diseases, autoimmune disorders, cancer, transplantation, and reproduction. Various compound HLA-KIR genotypes appear to affect outcome of viral infections that suggests a role for HLA class I diversity in innate immunity as well as adaptive immune responses. The aim of this review is focusing on the impact of HLA and KIR alleles and different combinations of these alleles on clinical outcome of viral diseases to validate this proof-of-concept with respect to the therapeutic interventions.

  17. KIR/HLA Interactions and Pathogen Immunity

    Directory of Open Access Journals (Sweden)

    Khaleel M. Jamil

    2011-01-01

    Full Text Available The innate immune system is the first line of defence in response to pathogen infection. Natural killer (NK cells perform a vital role in this response with the ability to directly kill infected cells, produce cytokines, and cross-talk with the adaptive immune system. These effector functions are dependent on activation of NK cells which is determined by surface receptor interactions with ligands on target cells. Of these receptors, the polymorphic killer immunoglobulin-like receptors (KIRs, which interact with MHC class 1 (also highly polymorphic, are largely inhibitory, and exhibit substantial genetic diversity. The result is a significant variation of NK cell repertoire between individuals and also between populations, with a multitude of possible KIR:HLA combinations. As each KIR:ligand interaction may have differential effects on NK cell activation and inhibition, this diversity has important potential influences on the host response to infections. Genetic studies have demonstrated associations between specific KIR:ligand combinations and the outcome of viral (and other infections, in particular hepatitis C and HIV infection. Detailed functional studies are not required to define the mechanisms underpinning these disease associations.

  18. Pre-implant right ventricular function might be an important predictor of the response to cardiac resynchronization therapy

    Directory of Open Access Journals (Sweden)

    Ring Margareta

    2011-10-01

    Full Text Available Abstract Objective Cardiac resynchronization therapy is proven efficacious in patients with heart failure (HF. Presence of biventricular HF is associated with a worse prognosis than having only left ventricular (LV HF and pacing might deteriorate heart function. The aim of the study was to assess a possible significance of right ventricular (RV pre-implant systolic function to predict response to CRT. Design We studied 22 HF-patients aged 72 ± 11 years, QRS-duration 155 ± 20 ms and with an LV ejection fraction (EF of 26 ± 6% before and four weeks after receiving a CRT-device. Results There were no changes in LV diameters or end systolic volume (ESV during the study. However, end diastolic volume (EDV decreased from 226 ± 71 to 211 ± 64 ml (p = 0.02 and systolic maximal velocities (SMV increased from 2.2 ± 0.4 to 2.6 ± 0.9 cm/s (p = 0.04. Pre-implant RV-SMV (6.2 ± 2.6 cm/s predicted postoperative increase in LV contractility, p = 0.032. Conclusions Pre-implant decreased RV systolic function might be an important way to predict a poor response to CRT implicating that other treatments should be considered. Furthermore we found that 3D- echocardiography and Tissue Doppler Imaging were feasible to detect short-term changes in LV function.

  19. The balance of the immune system between HLA-G and NK cells in unexplained recurrent spontaneous abortion and polymorphisms analysis.

    Science.gov (United States)

    Arjmand, Fateme; Ghasemi, Nasrin; Mirghanizadeh, Seyed Ali; Samadi, Morteza

    2016-06-01

    Human leukocyte antigen (HLA)-G is involved in immunoregulatory processes and particularly in pathogenesis of inflammatory disorders such as recurrent spontaneous abortions (RSA). The purpose of the current study was to examine whether two single nucleotide polymorphisms (SNPs) of HLA-G gene (rs1736936 and HLA-G*0105N) influence susceptibility to recurrent spontaneous abortion. Genomic DNA from 117 RSA patients and 117 normal fertile control individuals was isolated using the salted out method. The two single nucleotide polymorphisms in HLA-G gene were analyzed using polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP). Differences between the two groups were analyzed by SPSS19 software using Chi-square test. The results revealed a significant increase in HLA-G*0105N allele in the proportion of whole group of RSA women compared with fertile controls (P value = 0.015), OR (95 % CI) = 2.054 (1.798-2.347), as well as an absence of homozygosity for HLA-G*0105N in the study population. No significant difference was observed between the RSA and the fertile groups in terms of alleles and genotypes frequency of rs1736936 (P value = 0.323), OR (95 CI %) = 1.056 (0.844-1.319). The presented data suggest that the investigated HLA-G*0105N allele is potentially associated with RSA through linkage disequilibrium with other genetic elements. Meanwhile, the rs1736936 SNP do not predispose to RSA in the study population.

  20. Identification of circulating nonclassic human leukocyte antigen G (HLA-G)-like molecules in exudates.

    Science.gov (United States)

    Gonzalez, Alvaro; Alegre, Estibaliz; Arroyo, Ainhoa; LeMaoult, Jöel; Echeveste, José Ignacio

    2011-07-01

    HLA-G in biological fluids has been proposed to be useful as a tumor marker as both a diagnostic and prognostic factor. Most HLA-G measurement procedures are based on ELISA methods using highly specific antibodies. However, results of published studies are in conflict regarding the clinical utility and even the nature of HLA-G present in circulation. We collected 118 exudates, 94 from cancer patients and 24 from patients without tumors. We measured HLA-G concentrations by ELISA using MEM-G/9 or G233 as capture antibody. Samples were immunoprecipitated with an anti-HLA-G antibody and analyzed by Western blot using a different anti-HLA-G antibody. Discrepancies in HLA-G concentrations in exudates were observed depending on what capture anti-HLA-G antibody was used for ELISA (r = 0.376). These discrepancies were not observed when the ELISAs were performed using culture supernatants from HLA-G1-transfected cells (r = 0.983). Immunoprecipitation and Western blot of cell culture supernatants with 2 different anti-HLA-G antibodies produced the typical band at 39 kDa assigned to HLA-G. When the immunoprecipitation and western blot were performed with exudates, however, there were bands at 53 kDa and 70-76 kDa, higher molecular weights than those usually assigned to HLA-G. These HLA-G-like molecules were associated with β(2)-microglobulin and could also form disulfide bridges with other HLA-G-like molecules. The main HLA-G antigenic molecules in exudates are HLA-G-like complexes, a factor that should be considered when analyzing HLA-G in biological fluids.

  1. Association between HLA-C*04 and American cutaneous leishmaniasis in endemic region of southern Brazil.

    Science.gov (United States)

    Ribas-Silva, R C; Ribas, A D; Ferreira, E C; Silveira, T G V; Borelli, S D

    2015-11-23

    Leishmaniasis is a parasitic infectious disease with global repercussions. American cutaneous leishmaniasis (ACL) is endemic in southern Brazil and its pathogenesis varies according to parasite species, immune response, and host genetics. In terms of immunogenetics, many host genes, including HLA (human leukocyte antigen), could be involved in susceptibility to and protection against ACL. Accordingly, the aim of this study was to investigate the association between HLA class I genes (HLA-A, -B, and -C) and ACL in an endemic region of southern Brazil. The allele frequencies of 186 patients diagnosed with ACL and 278 healthy individuals were compared. HLA class I (HLA-A, -B, and -C) typing was carried out by PCR-SSO using Luminex technology. The results revealed an association between the HLA-C*04 allele and the patient study group, in which it appeared more frequently than in the control group [21.5 vs 13.49% (P = 0.0016 and Pc = 0.0258; OR = 1.7560; 95%CI = 1.2227-2.5240)], thereby suggesting an increased susceptibility to ACL. Additional allelic groups such as HLA-A*02, HLA-B*35, HLA-B*45, HLA-C*01, and HLA-C*15 were also implicated; however, further investigation is necessary to confirm their association with ACL. Therefore, the results obtained in this study demonstrate the involvement of HLA class I genes in the susceptibility or resistance to ACL, with significant association between HLA-C*04 and ACL susceptibility.

  2. Characterisation of rapid progressors to type 1 diabetes among children with HLA-conferred disease susceptibility.

    Science.gov (United States)

    Pöllänen, Petra M; Lempainen, Johanna; Laine, Antti-Pekka; Toppari, Jorma; Veijola, Riitta; Vähäsalo, Paula; Ilonen, Jorma; Siljander, Heli; Knip, Mikael

    2017-07-01

    In this study, we aimed to characterise rapid progressors to type 1 diabetes among children recruited from the general population, on the basis of HLA-conferred disease susceptibility. We monitored 7410 HLA-predisposed children participating in the Finnish Type 1 Diabetes Prediction and Prevention (DIPP) study for the development of beta cell autoimmunity and type 1 diabetes from birth over a median follow-up time of 16.2 years (range 0.9-21.1 years). Islet cell antibodies (ICA) and autoantibodies to insulin (IAA), GAD (GADA) and islet antigen 2 (IA-2A) were assessed as markers of beta cell autoimmunity. Rapid progression was defined as progression to clinical type 1 diabetes within 1.5 years of autoantibody seroconversion. We analysed the association between rapid progression and demographic and autoantibody characteristics as well as genetic markers, including 25 non-HLA SNPs predisposing to type 1 diabetes. Altogether, 1550 children (21%) tested positive for at least one diabetes-associated autoantibody in at least two samples, and 248 (16%) of seroconverters progressed to type 1 diabetes by the end of 2015. The median time from seroconversion to diagnosis was 0.51 years in rapid progressors (n = 42, 17%) and 5.4 years in slower progressors. Rapid progression was observed both among young (7 years), resulting in a double-peak distribution of seroconversion age. Compared with slower progressors, rapid progressors had a higher frequency of positivity for multiple (≥2) autoantibodies and had higher titres of ICA, IAA and IA-2A at seroconversion, and there was a higher prevalence of the secretor genotype in the FUT2 gene among those carrying the high-risk HLA genotype. Compared with autoantibody-positive non-progressors, rapid progressors were younger, were more likely to carry the high-risk HLA genotype and a predisposing SNP in the PTPN22 gene, had higher frequency of ICA, IAA, GADA and IA-2A positivity and multipositivity, and had higher titres of all

  3. Reproductive Endocrinologists' Utilization of Genetic Counselors for Oncofertility and Preimplantation Genetic Diagnosis (PGD) Treatment of BRCA1/2 Mutation Carriers.

    Science.gov (United States)

    Goetsch, Allison L; Wicklund, Catherine; Clayman, Marla L; Woodruff, Teresa K

    2016-06-01

    Genetic counselors believe fertility preservation and preimplantation genetic diagnosis (PGD) discussions to be a part of their role when counseling BRCA1/2 mutation-positive patients. This study is the first to explore reproductive endocrinologists' (REI) practices and attitudes regarding involvement of genetic counselors in the care of BRCA1/2 mutation carriers seeking fertility preservation and PGD. A survey was mailed to 1000 REIs from Reproductive Endocrinology & Infertility (SREI), an American Society for Reproductive Medicine (ASRM) affiliate group. A 14.5 % response rate was achieved; data was analyzed using SPSS software. The majority of participating REIs were found to recommend genetic counseling to cancer patients considering fertility preservation (82 %) and consult with a genetic counselor regarding PGD for hereditary cancer syndromes (92 %). Additionally, REIs consult genetic counselors regarding PGD patient counseling (88 %), genetic testing (78 %), and general genetics questions (66 %). Two areas genetic counselors may further aid REIs are: elicitation of family history, which is useful to determine fertility preservation and PGD intervention timing (32 % of REIs utilize a cancer family history to determine intervention timing); and, interpretation of variants of uncertain significance (VOUS) as cancer panel genetic testing becomes more common (36 % of REIs are unfamiliar with VOUS). Given our findings, the Oncofertility Consortium® created an online resource for genetic counselors focused on fertility preservation education and communication strategies.

  4. Assessment of developmental retardation and abnormality of in vivo produced preimplantation embryos in rat.

    Science.gov (United States)

    Rupasri, A; Shivakumar, K R; Sreenath, B R; Seshagiri, P B

    1995-12-01

    In most mammals studied, a substantial numbers of preimplantation embryos are believed to be lost in vivo. In vitro, embryos develop slowly and lose viability. Hence, there is a need to assess the extent and cause of embryonic loss both in vivo and in vitro. In this study, we assessed the quality of in vivo produced ovulation products/embryos, recovered on days 1-5 pregnancy, from naturally bred wistar rats. From day 1 pregnant rats (n = 24), 226 ovulation products were recovered which included 52% (117) unfertilized oocytes and empty zonae with/without cell debris (UFO-EZ:CD) and 48% (109) 1-cells. Flushings of day 2 rats (n = 27) contained 229 ovulation products, consisting of 70% (160) 2-cells and 30% (69) UFO-EZ:CD. Flushings of day 3 rats (n = 27) had 23% (56) 2-cells, 6% (15) 3-cells, 23% (57) 4-cells, 1% (2) 5-7 cells, 2% (5) 8-cells and 45% (112) UFO-EZ:CD, total being 247. Flushings of day 4 rats (n = 28) had 193 ovulation products comprising of one morula, 45% (86) 8-cells, 5% (9) 5-7-cells and the rest were 4-cells (2), 3-cells (2), 2-cells (1) and 48% (92) UFO-EZ:CD. Day 5 flushings (n = 27) had 202 ovulation products which included 13% (27) morulae, 17% (34) early, 36% (73) mid and 2% (5) late blastocysts; additionally, 4-cells (1), 8-cells (2) and 30% (60) UFO-EZ:CD were also recovered. On day 4, embryos (8-cells) migrated from the oviduct to the uterus. When pregnant rats (n = 25) were allowed to term, only 15 females (60%) delivered pups (128) with variable litter size (2-12). These results indicate that 56% (619/1097) of recovered rat preimplantation embryos are of expected developmental age with a mixture of asynchronously cleaving embryos. The remaining 44% (478) is comprised of 38% (417) UFO-EZ:CD and 6% (61) abnormal and developmentally retarded embryos, which are unlikely to produce viable pups at term.

  5. Dynamics of DNA methylation during early development of the preimplantation bovine embryo.

    Directory of Open Access Journals (Sweden)

    Kyle B Dobbs

    Full Text Available There is species divergence in control of DNA methylation during preimplantation development. The exact pattern of methylation in the bovine embryo has not been established nor has its regulation by gender or maternal signals that regulate development such as colony stimulating factor 2 (CSF2. Using immunofluorescent labeling with anti-5-methylcytosine and embryos produced with X-chromosome sorted sperm, it was demonstrated that methylation decreased from the 2-cell stage to the 6-8 cell stage and then increased thereafter up to the blastocyst stage. In a second experiment, embryos of specific genders were produced by fertilization with X- or Y-sorted sperm. The developmental pattern was similar to the first experiment, but there was stage × gender interaction. Methylation was greater for females at the 8-cell stage but greater for males at the blastocyst stage. Treatment with CSF2 had no effect on labeling for DNA methylation in blastocysts. Methylation was lower for inner cell mass cells (i.e., cells that did not label with anti-CDX2 than for trophectoderm (CDX2-positive. The possible role for DNMT3B in developmental changes in methylation was evaluated by determining gene expression and degree of methylation. Steady-state mRNA for DNMT3B decreased from the 2-cell stage to a nadir for D 5 embryos >16 cells and then increased at the blastocyst stage. High resolution melting analysis was used to assess methylation of a CpG rich region in an intronic region of DNMT3B. Methylation percent decreased between the 6-8 cell and the blastocyst stage but there was no difference in methylation between ICM and TE. Results indicate that DNA methylation undergoes dynamic changes during the preimplantation period in a manner that is dependent upon gender and cell lineage. Developmental changes in expression of DNMT3B are indicative of a possible role in changes in methylation. Moreover, DNMT3B itself appears to be under epigenetic control by methylation.

  6. A large population-based association study between HLA and KIR genotypes and measles vaccine antibody responses.

    Science.gov (United States)

    Ovsyannikova, Inna G; Schaid, Daniel J; Larrabee, Beth R; Haralambieva, Iana H; Kennedy, Richard B; Poland, Gregory A

    2017-01-01

    Human antibody response to measles vaccine is highly variable in the population. Host genes contribute to inter-individual antibody response variation. The killer cell immunoglobulin-like receptors (KIR) are recognized to interact with HLA molecules and possibly influence humoral immune response to viral antigens. To expand on and improve our previous work with HLA genes, and to explore the genetic contribution of KIR genes to the inter-individual variability in measles vaccine-induced antibody responses, we performed a large population-based study in 2,506 healthy immunized subjects (ages 11 to 41 years) to identify HLA and KIR associations with measles vaccine-induced neutralizing antibodies. After correcting for the large number of statistical tests of allele effects on measles-specific neutralizing antibody titers, no statistically significant associations were found for either HLA or KIR loci. However, suggestive associations worthy of follow-up in other cohorts include B*57:01, DQB1*06:02, and DRB1*15:05 alleles. Specifically, the B*57:01 allele (1,040 mIU/mL; p = 0.0002) was suggestive of an association with lower measles antibody titer. In contrast, the DQB1*06:02 (1,349 mIU/mL; p = 0.0004) and DRB1*15:05 (2,547 mIU/mL; p = 0.0004) alleles were suggestive of an association with higher measles antibodies. Notably, the associations with KIR genotypes were strongly nonsignificant, suggesting that KIR loci in terms of copy number and haplotypes are not likely to play a major role in antibody response to measles vaccination. These findings refine our knowledge of the role of HLA and KIR alleles in measles vaccine-induced immunity.

  7. Activating KIR and HLA Bw4 ligands are associated to decreased susceptibility to pemphigus foliaceus, an autoimmune blistering skin disease.

    Directory of Open Access Journals (Sweden)

    Danillo G Augusto

    Full Text Available The KIR genes and their HLA class I ligands have thus far not been investigated in pemphigus foliaceus (PF and related autoimmune diseases, such as pemphigus vulgaris. We genotyped 233 patients and 204 controls for KIR by PCR-SSP. HLA typing was performed by LABType SSO reagent kits. We estimated the odds ratio, 95% confidence interval and performed logistic regression analyses to test the hypothesis that KIR genes and their known ligands influence susceptibility to PF. We found significant negative association between activating genes and PF. The activating KIR genes may have an overlapping effect in the PF susceptibility and the presence of more than three activating genes was protective (OR=0.49, p=0.003. A strong protective association was found for higher ratios activating/inhibitory KIR (OR=0.44, p=0.001. KIR3DS1 and HLA-Bw4 were negatively associated to PF either isolated or combined, but higher significance was found for the presence of both together (OR=0.34, p<10(-3 suggesting that the activating function is the major factor to interfere in the PF pathogenesis. HLA-Bw4 (80I and 80T was decreased in patients. There is evidence that HLA-Bw4(80T may also be important as KIR3DS1 ligand, being the association of this pair (OR=0.07, p=0.001 stronger than KIR3DS1-Bw4(80I (OR=0.31, p=0.002. Higher levels of activating KIR signals appeared protective to PF. The activating KIR genes have been commonly reported to increase the risk for autoimmunity, but particularities of endemic PF, like the well documented influence the environmental exposure in the pathogenesis of this disease, may be the reason why activated NK cells probably protect against pemphigus foliaceus.

  8. A large population-based association study between HLA and KIR genotypes and measles vaccine antibody responses

    Science.gov (United States)

    Ovsyannikova, Inna G.; Schaid, Daniel J.; Larrabee, Beth R.; Haralambieva, Iana H.; Kennedy, Richard B.; Poland, Gregory A.

    2017-01-01

    Human antibody response to measles vaccine is highly variable in the population. Host genes contribute to inter-individual antibody response variation. The killer cell immunoglobulin-like receptors (KIR) are recognized to interact with HLA molecules and possibly influence humoral immune response to viral antigens. To expand on and improve our previous work with HLA genes, and to explore the genetic contribution of KIR genes to the inter-individual variability in measles vaccine-induced antibody responses, we performed a large population-based study in 2,506 healthy immunized subjects (ages 11 to 41 years) to identify HLA and KIR associations with measles vaccine-induced neutralizing antibodies. After correcting for the large number of statistical tests of allele effects on measles-specific neutralizing antibody titers, no statistically significant associations were found for either HLA or KIR loci. However, suggestive associations worthy of follow-up in other cohorts include B*57:01, DQB1*06:02, and DRB1*15:05 alleles. Specifically, the B*57:01 allele (1,040 mIU/mL; p = 0.0002) was suggestive of an association with lower measles antibody titer. In contrast, the DQB1*06:02 (1,349 mIU/mL; p = 0.0004) and DRB1*15:05 (2,547 mIU/mL; p = 0.0004) alleles were suggestive of an association with higher measles antibodies. Notably, the associations with KIR genotypes were strongly nonsignificant, suggesting that KIR loci in terms of copy number and haplotypes are not likely to play a major role in antibody response to measles vaccination. These findings refine our knowledge of the role of HLA and KIR alleles in measles vaccine-induced immunity. PMID:28158231

  9. Alloantibodies to human platelet glycoprotein antigens (HPA) and HLA class 1 in a cross section of Nigerian antenatal women.

    Science.gov (United States)

    Jeremiah, Zaccheaus Awortu; Atiegoba, Anne Ifeanyi; Mgbere, Osaro

    2011-01-01

    The prevalence of antibodies to human platelet antigens (HPA) and human leukocyte antigens (HLA) class 1 antigens among Nigerian pregnant women has not been reported in our country. This study was therefore aimed at screening the obstetric population for evidence of alloimmunization due to human platelet and HLA class 1 antigens. One hundred and forty four (144) pregnant women attending the obstetric clinic of Military Hospital, Port Harcourt, participated in the study. Their sera were tested for antibodies to HPA and HLA class 1 antigens using GTI PakPlus solid phase ELISA Kit. The total prevalence rate of antibody production was 60.5% (87 out of 144). Among the positive samples, 60 had platelet glycoprotein specific antibodies (41.7%) and 27 had HLA class 1 antibodies (18.8%). In 39.6% of the pregnant women, both platelet specific antibodies and HLA class 1 antibodies appeared. The prevalence of platelet specific glycoprotein antibodies were obtained as follows: GP 11b/111a 12 (8.3%), GP 1a/11a 35 (20.8%), GP Ib/IX 18 (12.5%) and GP IV 9 (6.3%). The prevalence of each platelet antibody subgroup was obtained as follows: anti-HPA-1a,-3a,-4a (4.2%), anti-HPA-1b,-3b,-4a (4.2%), anti-HPA-30 5a and anti-GP Ib/IX (12.5% each), anti-HPA-5b (8.3%) and anti-GP IV (6.3%). A high prevalence rate of human platelet arid cytotoxic antibodies has been observed in our obstetric population. There is need to establish platelet serology laboratory for the proper antenatal and postnatal management of pregnant mothers in this region.

  10. Polymorphism of exon 3 of the HLA-G gene

    DEFF Research Database (Denmark)

    Hviid, T V; Meldgaard, Michael; Sørensen, S

    1997-01-01

    populations have only revealed a limited polymorphism. We investigated the polymorphism of the exon 3 of HLA-G by means of Polymerase Chain Reaction (PCR)-Single Strand Conformation Polymorphism (SSCP)- and DNA sequencing analysis in a Danish population. We detected four single-base substitutions in exon 3...... rate of embryos. HLA-G seems to play an important role in the feto-maternal relationship. The polymorphism of the HLA-G locus is not fully clarified. One study has shown extensive nucleotide sequence variation in the exon 3 (alpha-2 domain) in healthy African Americans. A few studies in other...... compared to the sequence of HLA-6.0 (G*01011); one of these has not been reported before. We also found a deletion of the first base of codon 130 or the third of codon 129 in a heterozygous individual. This study, together with previous results, suggests that the polymorphism of exon 3 of the HLA-G gene...

  11. HLA genes in Lamas Peruvian-Amazonian Amerindians.

    Science.gov (United States)

    Moscoso, Juan; Seclen, Segundo; Serrano-Vela, Juan I; Villena, A; Martinez-Laso, Jorge; Zamora, Jorge; Moreno, Almudena; Ira-Cachafeiro, Juan; Arnaiz-Villena, Antonio

    2006-04-01

    The Lamas Amerindians are the Chancas descents who established before 1532 a.d. (Spanish conquest) at Lamas City, Wayku quarter in a Peruvian-Amazonian province (San Martin). The Lamas HLA profile shows significant differences with other Amerindians HLA profile, i.e.: (a) a higher number of newly found haplotypes compared to other studied Amerindian populations, particularly HLA-A*02-B*48-DRB1*0403-DQB1*0302, A*02-B*48-DRB1*0804-DQB1*0402 and A*02-B*40-DRB1*0407-DQB1*0302; (b) a relative high frequency of HLA-DRB1*0901 (a high frequency southern Asian allele) and HLA-B*48 (a Na-Dene, Siberian and Eskimo allele); both alleles are also found frequently in Quechuas and Aymaras, but not in many other (particularly Meso American) Amerindians and (c) correspondence and neighbor-joining dendrogram analyses show that Lamas (Chancas) may have an origin close to Amazonian Indians that later reached the Andean altiplano.

  12. HLA Mismatching Strategies for Solid Organ Transplantation - a Balancing Act

    Directory of Open Access Journals (Sweden)

    Andrea A. Zachary

    2016-12-01

    Full Text Available HLA matching provides numerous benefits in organ transplantation including better graft function, fewer rejection episodes, longer graft survival, and the possibility of reduced immunosuppression. Mismatches are attended by more frequent rejection episodes that require increased immunosuppression that, in turn, can increase the risk of infection and malignancy. HLA mismatches also incur the risk of sensitization, which can reduce the opportunity and increase waiting time for a subsequent transplant. However, other factors such as donor age, donor type, and immunosuppression protocol, can affect the benefit derived from matching. Further, finding a well matched donor may not be possible for all patients and usually prolongs waiting time. Strategies to optimize transplantation for patients without a well matched donor should take into account the immunologic barrier represented by different mismatches: what are the least immunogenic mismatches considering the patient’s HLA phenotype; should repeated mismatches be avoided; is the patient sensitized to HLA and, if so, what are the strengths of the patient’s antibodies? This information can then be used to define the HLA type of an immunologically optimal donor and the probability of such a donor occurring. A probability that is considered to be too low, may require expanding the donor population through paired donation or modifying what is acceptable which may require employing treatment to overcome immunologic barriers such as increased immunosuppression or desensitization. Thus, transplantation must strike a balance between the risk associated with waiting for the optimal donor and the risk associated with a less than optimal donor.

  13. HLA in anthropology: the enigma of Easter Island.

    Science.gov (United States)

    Sanchez-Mazas, Alicia; Thorsby, Erik

    2013-01-01

    In this article, we first present four significant cases where human leukocyte antigen (HLA) studies have been useful for the reconstruction of human peopling history on the worldwide scale; i.e., the spread of modern humans from East Africa, the colonization of East Asia along two geographic routes, the co-evolution of genes and languages in Africa, and the peopling of Europe through a main northward migration. These examples show that natural selection did not erase the genetic signatures of our past migrations in the HLA genetic diversity patterns observed today. In the second part, we summarize our studies on Easter Island. Using genomic HLA typing, we could trace an introduction of HLA alleles of native American (Amerindian) origin to Easter Island before the Peruvian slave trades; i.e., before the 1860s, and provide suggestive evidence that they may have already been introduced in prehistoric time. Our results give further support to an initial Polynesian population of the island, but also reveal an early contribution by Amerindians. Together, our data illustrate the usefulness of typing for HLA alleles to complement genetic analyses in anthropological investigations.

  14. Cancer treatment and the KIR-HLA system: an overview.

    Science.gov (United States)

    Leone, Patrizia; De Re, Valli; Vacca, Angelo; Dammacco, Franco; Racanelli, Vito

    2017-02-10

    Accumulating evidence indicates that the success of cancer therapy depends not only on a combination of adequate procedures (surgery, chemotherapy and radiotherapy) that aim to eliminate all tumor cells, but also on the functional state of the host immune system. HLA and KIR molecules, in particular, are critical to the interactions between tumor cells and both innate and adaptive immune cells such as NK cells and T cells. Different KIR-HLA gene combinations as well as different HLA expression levels on tumor cells associate with variable tumor prognosis and response to treatment. On the other hand, different therapies have different effects on HLA molecules and immune cell functions regulated by these molecules. Here, we provide an overview of the KIR-HLA system, a description of its alterations with clinical relevance in diverse tumor types, and an analysis of the consequences that conventional cancer therapies may have on it. We also discuss how this knowledge can be exploited to identify potential immunological biomarkers that can help to select patients for tailored therapy.

  15. Molecular analysis of HLA-B in the Malaysian aborigines.

    Science.gov (United States)

    Hirayama, K; Zaidi, A S; Lokman Hakim, S; Kimura, A; Ong, K J; Kikuchi, M; Nasuruddin, H A; Kojima, S; Mak, J W

    1996-12-01

    We have examined 56 unrelated individuals from Malaysian aborigines for their DNA polymorphism of the HLA-B gene by sequence specific oligonucleotide probe (SSO) method. Using the SSO hybridization, we found that one specific DNA allele with a B*1513 like pattern of epitope combination (ECB1513) was dominant among the Melayu Asli (Af = 41.9%) and the Senoi (Af = 24%). To determine the nucleotide sequences of ECB1513, a DNA fragment spanning from the beginning of exon 1 to the middle of exon 4 of the HLA-B gene was amplified by polymerase chain reaction (PCR) from two ECB1513 positive individuals, and the PCR products were cloned and sequenced. This sequencing analysis confirmed that ECB1513 was identical to HLA-B*1513 in exon 1, 2, 3, and 4. Amino acid sequence of this major allele, HLA-B*1513, in the aborigines especially around the peptide binding groove (B and F pockets), was compared with that of African B*5301 that had been suggested to confer resistance to malaria infection in Africa. The amino acid residues composing of the F pocket were completely identical in B*1513 and B*5301. These observations suggest that a common environmental factor, the malaria infection, might have independently enhanced the selection of functional change in the polymorphic portion of HLA-B gene in Africa and in South-East Asia.

  16. The incidence of HLA-SD antigens in recessive retinitis pigmentosa.

    Science.gov (United States)

    Chen, M C; Marak, G E; Pilkerton, A R

    1978-01-01

    Eighteen patients with recessive retinitis pigmentosa were tissue typed for HLA-SD antigens. There was no evidence that a particular HLA-SD antigen was associated with autosomal recessive retinitis pigmentosa. PMID:638110

  17. HLA DR/DQ type in a Malay population in Kelantan, Malaysia.

    Science.gov (United States)

    Azira, N M S; Zeehaida, M; Nurul Khaiza, Y

    2013-06-01

    The human leucocyte antigen (HLA) has been documented to be involved in various disease susceptibilities or in resistance against certain diseases. An important element in susceptibility and resistance to disease is ethnic genetic constitution. Cognizant of this, the present study aimed at studying the prevalence of particular HLA class II in a normal healthy Malay population which may serve as a guide for further genetic and immunological studies related to the Malay Malaysian population. The study involved 40 normal healthy Malay persons in Kelantan. HLA typing was conducted on venous blood samples through a polymerase chain reaction-sequence specific primer method (low resolution Olerup SSP© HLA Typing Kits). The study found HLA DR12 and HLA DQ8 to be the most frequent HLA class II type. HLA DQ5 was significantly associated with female subjects.

  18. High expression of HLA-E in colorectal carcinoma is associated with a favorable prognosis

    Directory of Open Access Journals (Sweden)

    Monaco Elisa Lo

    2011-10-01

    Full Text Available Abstract Background Human Leukocyte Antigen (HLA-E is a non-classical class I HLA molecule that can be stabilized by ligands donated by other classical (HLA-A, -B, -C and non-classical (HLA-G family members. HLA-E engages a variety of immune receptors expressed by cytotoxic T lymphocytes (CTLs, Natural killer (NK cells and NK-CTLs. In view of the opposing outcomes (activation or inhibition of the different HLA-E receptors, the preferred role (if any of HLA-E expressed in vivo on tumor cells remains to be established. Methods Taking advantage of MEM-E/02, a recently characterized antibody to denatured HLA-E molecules, HLA-E expression was assessed by immunohistochemistry on an archival collection (formalin-fixed paraffin-embedded of 149 colorectal primary carcinoma lesions paired with their morphologically normal mucosae. Lymphoid infiltrates were assessed for the expression of the HLA-E-specific, inhibitory, non-rearranging receptor NKG2A. Results High HLA-E expression did not significantly correlate with the expression of classical HLA-B and HLA-C molecules, but it did correlate with high expression of its preferential ligand donor HLA-A. In addition, it correlated with lymphoid cell infiltrates expressing the inhibitory NKG2A receptor, and was an independent predictor of good prognosis, particularly in a subset of patients whose tumors express HLA-A levels resembling those of their paired normal counterparts (HLA-A. Thus, combination phenotypes (HLA-Elo-int/HLA-AE and HLA-Ehi/HLA-AE of classical and non-classical class I HLA molecules mark two graded levels of good prognosis. Conclusions These results suggest that HLA-E favors activating immune responses to colorectal carcinoma. They also provide evidence in humans that tumor cells entertain extensive negotiation with the immune system until a compromise between recognition and escape is reached. It is implied that this process occurs stepwise, as predicted by the widely accepted

  19. Linkage of GLO with HLA and Bf. Effect of population and sex on recombination frequency.

    Science.gov (United States)

    Weitkamp, L R

    1976-05-01

    Further data on the linkage relationships of red cell glyoxalase I(GLO) with HLA and Bf are reported. The most likely order of loci is GLO: Bf: HLA-B: HLA-A. No sex difference in the frequency of recombination between GLO and HLA was noted, but recombination was more frequent for both males and females in the American black population than in the white population.

  20. HLA-G coding region and 3'untranslated region (3'UTR) in two Chinese Han populations.

    Science.gov (United States)

    Wang, Wen Yi; Tian, Wei; Liu, Xue Xiang; Li, Li Xin

    2016-08-01

    In this study, exons 2-4 and 3'untranslated region (3'UTR) of human leukocyte antigen (HLA)-G gene were investigated for 201 and 104 healthy unrelated Han samples recruited from Hunan Province, southern China and central Inner Mongolia Autonomous Region, northern China, respectively, using sequence-based typing and cloning methods. Totally 12 HLA-G alleles in the coding region, 9 variable sites in 3'UTR, 8 3'UTR haplotypes and 15 HLA-G extended haplotypes (EHs) incorporating the coding region and 3'UTR were observed. Very strong linkage disequilibrium (LD) was observed between HLA-A and HLA-G, and between HLA-G coding region and 3'UTR in each population (all global P=0.0000). Seven HLA-A-G haplotypes showed significant LD in both populations. Three HLA-G alleles in the coding region, 4 polymorphic sites in the 3'UTR, 3 3'UTR haplotypes and 4 HLA-G EHs differed significantly in their distributions between the 2 Chinese Han populations (all P≤0.0001). There was evidence for balancing selection acting on HLA-G 3'UTR positions +3010, +3142 and +3187 in the two populations. The NJ dendrograms demonstrated the existence of two basic HLA-G lineages and indicated that, HLA-G*01:01:01, the most common HLA-G allele, formed a separate lineage from other alleles. Our results shed new lights into HLA-G genetics among Chinese Han populations. The findings reported here are of importance for future studies related to post-transcriptional regulation of HLA-G allelic expression and the potential role of HLA-G in disease association in populations of Chinese ancestry.