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Sample records for chromomycins

  1. Cytological detection of cervical carcinoma with new cytochemical markers and flow microanalysis. [Mithramycin, chromomycin

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    Jensen, R.H.; King, E.B.; Mayall, B.H.

    1976-04-21

    Human cervical cell samples have been stained with mithramycin or chromomycin A3 in an effort to analyze such preparations for premalignant abnormal cells by flow cytometry. Fluorescence from mithramycin or chromomycin A3-stained cells is similar to the fluorescence from DNA in solution when it is complexed with these same antibiotics. Mithramycin or chromomycin A3-stained cells exhibit nuclear specific fluorescence which, for exponentially grown tissue culture cells, reflects the cellular DNA content. All these facts indicate that DNA is the sole intracellular binding site for these antibiotics. Flow cytofluorometry on mithramycin or chromomycin A3-stained cervical cells using a single parameter, fluorescence intensity per cell, appears to be a poor diagnostic procedure. However, simultaneous analysis of cellular fluorescence and small angle light scatter permits a relatively detailed description of each cell sample and appears to be useful for automated sample diagnosis. Qualitative diagnostic analysis based on comparisons of two parameter histograms agrees moderately well with cytomorphological diagnosis on the same cell samples. A technique for quantitation in comparing two parameter histograms is presented and promises to be useful for further progress in flow analysis of human cervical cell samples.

  2. Enzymatic Conversion of Glucose to UDP-4-Keto-6-Deoxyglucose in Streptomyces spp.

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    Liu, Song Yu; Rosazza, John P. N.

    1998-01-01

    All of the 2,6-dideoxy sugars contained within the structure of chromomycin A3 are derived from d-glucose. Enzyme assays were used to confirm the presence of hexokinase, phosphoglucomutase, UDPG pyrophosphorylase (UDPGP), and UDPG oxidoreductase (UDPGO), all of which are involved in the pathway of glucose activation and conversion into 2,6-dideoxyhexoses during chromomycin biosynthesis. Levels of the four enzymes in Streptomyces spp. cell extracts were correlated with the production of chromo...

  3. Chromosome heteromorphism quantified by high-resolution bivariate flow karyotyping.

    OpenAIRE

    Trask, B; van den Engh, G; Mayall, B; Gray, J. W.

    1989-01-01

    Maternal and paternal homologues of many chromosome types can be differentiated on the basis of their peak position in Hoechst 33258 versus chromomycin A3 bivariate flow karyotypes. We demonstrate here the magnitude of DNA content differences among normal chromosomes of the same type. Significant peak-position differences between homologues were observed for an average of four chromosome types in each of the karyotypes of 98 different individuals. The frequency of individuals with differences...

  4. Molecular cytogenetic characterization of some representatives of the subgenera Artemisia and Absinthium (genus Artemisia, Asteraceae)

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    Vallès, J.; Siljak-Yakovlev, S.; Hidalgo, O.; Garnatje, T.; Garcia, S.; Pellicer, J.

    2008-01-01

    A molecular cytogenetic study has been performed in three species of the genus Artemisia, complementing previous works on two subgenera that had been scarcely studied from this standpoint, Artemisia ( A. chamaemelifolia, A. vulgaris) and Absinthium ( A. absinthium). Chromomycin A3 and 4',6-diamidino-2-phenylindole (DAPI) banding have been carried out, as well as fluorescent in situ hybridization (...

  5. Comparing the Roles of Sperm Chromatin Integrity and Apoptosis in Intrauterine Insemination Outcomes of Couples with Mild Male and Female Factor Infertility

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    Khalili, Mohammad Ali; Nazari, Saeedeh; Dehghani-Firouzabadi, Razieh; Talebi, Alireza; Baghazadeh-Naeini, Shekofeh; Sadeghian-Nodoshan, Fatemeh; Agha-Rahimi, Azam

    2014-01-01

    Background Intrauterine insemination (IUI) is one of the therapeutic approaches for infertility. The objective of this study was to evaluate DNA integrity and apoptosis role in success of IUI in both mild male and female factor infertility. Methods Patients were divided into two groups: M (mild male factor; n = 29) and F (female factor; n = 31) undergoing single IUI. Ejaculates were analyzed and chromatin quality was assessed using chromomycin A3 (CMA3) staining. In addition, spermatozoal apo...

  6. The Unique Karyotype of Henochilus wheatlandii, a Critically Endangered Fish Living in a Fast-Developing Region in Minas Gerais State, Brazil

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    Silva, Priscilla C.; Udson Santos; Travenzoli, Natália M.; Zanuncio, Jose C.; Marcelo de B Cioffi; Dergam, Jorge A.

    2012-01-01

    Henochilus wheatlandii, the only species of this genus, is critically endangered and was considered extinct for over a century. The rediscovery of this fish in 1996 made it possible to study its phylogenetic relationships with other species in the subfamily Bryconinae. The aim of this study was to characterise the karyotype of H. wheatlandii. Standard staining, C-positive heterochromatin and nucleolar organiser region (NOR) banding, chromomycin A(3) staining, and fluorescent in situ hybridisa...

  7. Evaluation of sperm chromatin structure in boar semen

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    Banaszewska Dorota

    2015-06-01

    Full Text Available This study was an attempt to evaluate sperm chromatin structure in the semen of insemination boars. Preparations of semen were stained with acridine orange, aniline blue, and chromomycin A3. Abnormal protamination occurred more frequently in young individuals whose sexual development was not yet complete, but may also be an individual trait. This possibility is important to factor into the decision regarding further exploitation of insemination boars. Thus a precise assessment of abnormalities in the protamination process would seem to be expedient as a tool supplementing morphological and molecular evaluation of semen. Disruptions in nucleoprotein structure can be treated as indicators of the biological value of sperm cells.

  8. Tumor Protein (TP)-p53 Members as Regulators of Autophagy in Tumor Cells upon Marine Drug Exposure.

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    Ratovitski, Edward A

    2016-01-01

    Targeting autophagic pathways might play a critical role in designing novel chemotherapeutic approaches in the treatment of human cancers, and the prevention of tumor-derived chemoresistance. Marine compounds were found to decrease tumor cell growth in vitro and in vivo. Some of them were shown to induce autophagic flux in tumor cells. In this study, we observed that the selected marine life-derived compounds (Chromomycin A2, Psammaplin A, and Ilimaquinone) induce expression of several autophagic signaling intermediates in human squamous cell carcinoma, glioblastoma, and colorectal carcinoma cells in vitro through a transcriptional regulation by tumor protein (TP)-p53 family members. These conclusions were supported by specific qPCR expression analysis, luciferase reporter promoter assay, and chromatin immunoprecipitation of promoter sequences bound to the TP53 family proteins, and silencing of the TP53 members in tumor cells. PMID:27537898

  9. The unique karyotype of Henochilus wheatlandii, a critically endangered fish living in a fast-developing region in Minas Gerais State, Brazil.

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    Priscilla C Silva

    Full Text Available Henochilus wheatlandii, the only species of this genus, is critically endangered and was considered extinct for over a century. The rediscovery of this fish in 1996 made it possible to study its phylogenetic relationships with other species in the subfamily Bryconinae. The aim of this study was to characterise the karyotype of H. wheatlandii. Standard staining, C-positive heterochromatin and nucleolar organiser region (NOR banding, chromomycin A(3 staining, and fluorescent in situ hybridisation (FISH using 5S rDNA and 18S rDNA probes were conducted on nineteen specimens collected in the Santo Antonio River, a sub-basin of the Doce River in Ferros municipality, Minas Gerais State, Brazil. Henochilus wheatlandii shared the same diploid number and chromosome morphology as other species of Bryconinae. However, its heterochromatin distribution patterns, NOR localisation, and FISH patterns revealed a cytogenetic profile unique among Neotropical Bryconinae, emphasizing the evolutionary uniqueness of this threatened species.

  10. Quantification of the DNA content of structurally abnormal X chromosomes and X chromosome aneuploidy using high resolution bivariate flow karyotyping.

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    Trask, B; van den Engh, G; Nussbaum, R; Schwartz, C; Gray, J

    1990-01-01

    Quantification of the Hoechst and chromomycin A3 fluorescence intensities of mitotic human chromosomes isolated from karyotypically normal and abnormal cells was performed with a dual beam flow cytometer. The resultant flow karyotypes contain information about the relative DNA content and base composition of chromosomes and their relative frequencies in the mitotic cell sample. The relative copy number of X and Y chromosomes was determined for 38 normal males and females and 6 cell lines with X or Y chromosome aneuploidy. Flow karyotype diagnoses corresponded with conventional cytogenetic results in all cases. We show that chromosome DNA content can be derived from peak position in Hoechst vs. chromomycin flow karyotypes. These values are linearly related to propidium iodide staining intensity as measured with flow cytometry and to the binding of gallocyanin chrome alum to phosphate groups as measured with slide-based scanning photometry. Cell lines with deleted or dicentric X chromosomes ranging in length from 0.53 to 1.95 times normal were analyzed by using flow cytometry. The measured difference in DNA content between a normal X and each of the structurally abnormal chromosomes was linearly correlated to the difference predicted from cytogenetics and/or probe analyses. Deletions of 3-5 Mb, which were at and below the detection limits of conventional cytogenetics, could be quantified by flow karyotyping in individuals with X-linked diseases such as Duchenne muscular dystrophy, choroideremia, and ocular albinism/ichthyosis. The results show that the use of flow karyotyping to quantify the size of restricted regions of the genome can complement conventional cytogenetics and other physical mapping techniques in the study of genetic disorders. PMID:2106419

  11. Karyotype characterization of Trigona fulviventris Guérin, 1835 (Hymenoptera, Meliponini by C banding and fluorochrome staining: report of a new chromosome number in the genus

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    Domingues Alayne Magalhães Trindade

    2005-01-01

    Full Text Available Although many species of the genus Trigona have been taxonomically described, cytogenetic studies of these species are still rare. The aim of the present study was to obtain cytogenetic data by conventional staining, C banding and fluorochrome staining for the karyotype characterization of the species Trigona fulviventris. Cytogenetic analysis revealed that this species possesses a diploid chromosome number of 2n = 32, different from most other species of this genus studied so far. This variation was probably due to the centric fusion in a higher numbered ancestral karyotype, this fusion producing the large metacentric chromosome pair and the lower chromosome number observed in Trigona fulviventris. Heterochromatin was detected in the pericentromeric region of the first chromosome pair and in one of the arms of the remaining pairs. Base-specific fluorochrome staining with 4'-6-diamidino-2-phenylindole (DAPI showed that the heterochromatin was rich in AT base pairs (DAPI+ except for pair 13, which was chromomycin A3 (CMA3 positive indicating an excess of GC base pairs. Our data also suggests that there was variation in heterochromatin base composition.

  12. Chromosome heteromorphism quantified by high-resolution bivariate flow karyotyping.

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    Trask, B; van den Engh, G; Mayall, B; Gray, J W

    1989-11-01

    Maternal and paternal homologues of many chromosome types can be differentiated on the basis of their peak position in Hoechst 33258 versus chromomycin A3 bivariate flow karyotypes. We demonstrate here the magnitude of DNA content differences among normal chromosomes of the same type. Significant peak-position differences between homologues were observed for an average of four chromosome types in each of the karyotypes of 98 different individuals. The frequency of individuals with differences in homologue peak positions varied among chromosome types: e.g., chromosome 15, 61%; chromosome 3, 4%. Flow karyotypes of 33 unrelated individuals were compared to determine the range of peak position among normal chromosomes. Chromosomes Y, 21, 22, 15, 16, 13, 14, and 19 were most heteromorphic, and chromosomes 2-8 and X were least heteromorphic. The largest chromosome 21 was 45% larger than the smallest 21 chromosome observed. The base composition of the variable regions differed among chromosome types. DNA contents of chromosome variants determined from flow karyotypes were closely correlated to measurements of DNA content made of gallocyanin chrome alum-stained metaphase chromosomes on slides. Fluorescence in situ hybridization with chromosome-specific repetitive sequences indicated that variability in their copy number is partly responsible for peak-position variability in some chromosomes. Heteromorphic chromosomes are identified for which parental flow karyotype information will be essential if de novo rearrangements resulting in small DNA content changes are to be detected with flow karyotyping. PMID:2479266

  13. Karyotype relationships among Anastrepha bistrigata, A. striata and A. serpentina (Diptera, Tephritidae

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    Denise Selivon

    2007-01-01

    Full Text Available The species of Anastrepha are arranged into 17 intrageneric groups. Recently, it was proposed that two species of the striata group, Anastrepha striata and A. bistrigata, might be realocated to serpentina group. Anastrepha bistrigata and A. serpentina have an X1X2Y/X1X1 X2X2 sex chromosome system while A. striata has a XY/XX system. It was previously proposed that the karyotype of A. bistrigata could be derived from that of A. striata by an Y:A fusion, and that the karyotype of A. serpentina would be derived from another, hypothetical karyotype. In the present report sequential staining with DAPI and chromomycin A3 (CMA3, followed by C-banding, revealed that the C-banded heterochromatic blocks of the sex chromosomes of A. bistrigata have different affinities to fluorochromes in comparison to the chromosomes of A. striata, from which they have hypothetically derived. The chromosomes of A. serpentina show substantial differences in their cytochemical properties compared to their A. bistrigata and A. striata counterparts. The FISH technique showed that the ribosomal gene sequences are located in DAPI- or DAPI/CMA3-positive heterochromatic blocks of the sex chromosomes, one site on the Y chromosome and one site on the X chromosome (X1 in A. bistrigata and A. serpentina. The data suggest that the karyotype of A. striata and A. bistrigata could be derived from a common ancestral karyotype, while the A. serpentina karyotype probably has a distinct origin.

  14. Karyotype description of two species of Hypostomus (Siluriformes, Loricariidae) of the Planalto da Bodoquena, Brazil.

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    Cereali, S S; Pomini, E; Rosa, R; Zawadzki, C H; Froehlich, O; Giuliano-Caetano, L

    2008-01-01

    Hypostomus sp 3-Córrego Salobrinha NUP 4247 and Hypostomus sp 2-Rio Perdido NUP 4249, collected in the Planalto da Bodoquena, Paraguay River basin, Brazil, were characterized cytogenetically. Hypostomus sp 3-Córrego Salobrinha showed two modal numbers. This polymorphism consists of the presence of two extrachromosomes. It was not possible to define the diploid number in four specimens, where cell lineages had 2n = 83 and 2n = 84 chromosomes in one individual, and 2n = 82, 2n = 83 and 2n = 84 chromosomes in the others. These results reveal the existence of a genetic mosaic due to the occurrence of one or two extrachromosomes in this species. Hypostomus sp 2-Rio Perdido NUP 4249 showed a 2n = 84, FN = 106 with size heteromorphism in one pair of chromosomes stained with AgNO3. In both species, C banding showed a pattern of heterochromatin distribution with a few small bands in the centromeric and pericentromeric regions coinciding with chromomycin A3 staining. Until now, the major diploid number for the genus Hypostomus was 2n = 80, but the species studied here had chromosomes that in creased this number and the variation for this genus. Our results are also the first cytogenetic data on Hypostomus from the Paraguay River basin. PMID:18752185

  15. Chromosome Mapping of Repetitive Sequences in Rachycentron canadum (Perciformes: Rachycentridae: Implications for Karyotypic Evolution and Perspectives for Biotechnological Uses

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    Uedson Pereira Jacobina

    2011-01-01

    Full Text Available The cobia, Rachycentron canadum, a species of marine fish, has been increasingly used in aquaculture worldwide. It is the only member of the family Rachycentridae (Perciformes showing wide geographic distribution and phylogenetic patterns still not fully understood. In this study, the species was cytogenetically analyzed by different methodologies, including Ag-NOR and chromomycin A3 (CMA3/DAPI staining, C-banding, early replication banding (RGB, and in situ fluorescent hybridization with probes for 18S and 5S ribosomal genes and for telomeric sequences (TTAGGGn. The results obtained allow a detailed chromosomal characterization of the Atlantic population. The chromosome diversification found in the karyotype of the cobia is apparently related to pericentric inversions, the main mechanism associated to the karyotypic evolution of Perciformes. The differential heterochromatin replication patterns found were in part associated to functional genes. Despite maintaining conservative chromosomal characteristics in relation to the basal pattern established for Perciformes, some chromosome pairs in the analyzed population exhibit markers that may be important for cytotaxonomic, population, and biodiversity studies as well as for monitoring the species in question.

  16. Cytogenetic analysis in Thoracocharax stellatus (Kner, 1858 (Characiformes, Gasteropelecidae from Paraguay River Basin, Mato Grosso, Brazil

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    Edson Silva

    2012-09-01

    Full Text Available Thoracocharax stellatus (Characiformes, Gasteropelecidae is a small Neotropical species of fish, widely distributed in several rivers of South America. Evidence for karyotype heteromorphysm in populations from different geographical regions has been reported for this species. In this way, populations of T. stellatus from the Paraguay River basin were cytogenetically characterized and the results were compared with other studies performed in the same species but from different basins. The results showed a diploid number of 2n = 54 for T. stellatus, with chromosomes arranged in 6 metacentric (m, 6 submetacentric (sm, 2 subtelocentric (st and 40 acrocentric (a, for both sexes, with a simple Nucleolus Organiser Region (NOR system reported by the techniques of silver nitrate impregnation and fluorescent in situ hybridisation (FISH using 18S rDNA sequences as probe. The distribution of constitutive heterochromatin, observed by the C-band technique and Chromomycin A3 staining showed great similarity among the analyzed populations and consists mainly of discrete blocks in the pericentromeric and telomeric regions of most chromosomes. The presence of female heterogamety was also observed indicating a ZZ/ZW system with W chromosome almost totally heterochromatic. The results also show cytogenetic diversity of the group and are useful to understand the mechanisms of karyotype evolution of the family.

  17. Chromosome Mapping of Repetitive Sequences in Rachycentron canadum (Perciformes: Rachycentridae): Implications for Karyotypic Evolution and Perspectives for Biotechnological Uses

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    Jacobina, Uedson Pereira; Cioffi, Marcelo de Bello; Souza, Luiz Gustavo Rodrigues; Calado, Leonardo Luiz; Tavares, Manoel; Manzella, João; Bertollo, Luiz Antonio Carlos; Molina, Wagner Franco

    2011-01-01

    The cobia, Rachycentron canadum, a species of marine fish, has been increasingly used in aquaculture worldwide. It is the only member of the family Rachycentridae (Perciformes) showing wide geographic distribution and phylogenetic patterns still not fully understood. In this study, the species was cytogenetically analyzed by different methodologies, including Ag-NOR and chromomycin A3 (CMA3)/DAPI staining, C-banding, early replication banding (RGB), and in situ fluorescent hybridization with probes for 18S and 5S ribosomal genes and for telomeric sequences (TTAGGG)n. The results obtained allow a detailed chromosomal characterization of the Atlantic population. The chromosome diversification found in the karyotype of the cobia is apparently related to pericentric inversions, the main mechanism associated to the karyotypic evolution of Perciformes. The differential heterochromatin replication patterns found were in part associated to functional genes. Despite maintaining conservative chromosomal characteristics in relation to the basal pattern established for Perciformes, some chromosome pairs in the analyzed population exhibit markers that may be important for cytotaxonomic, population, and biodiversity studies as well as for monitoring the species in question. PMID:21541243

  18. Karyotypic variation in the Andean rodent Phyllotis xanthopygus (Waterhouse, 1837 (Rodentia, Cricetidae, Sigmodontinae

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    Carolina Alicia Labaroni

    2014-12-01

    Full Text Available Phyllotis xanthopygus (Waterhouse, 1837 is an Andean rodent endemic to South America. Despite its wide geographical distribution in Argentina, few individuals have been studied on the cytogenetic level and only through conventional staining. In this work, chromosome characterization of Argentine samples of this species was performed using solid staining, C-banding and base-specific fluorochromes. Twenty two specimens were analyzed, collected in the provinces of Jujuy, Catamarca, and the north and south of Mendoza. All studied specimens showed 2n=38, having mostly the bi-armed autosomes, metacentric or submetacentric. Fundamental Number varied between 70 and 72. These changes were due to the presence of chromosome heteromorphisms in individuals from southern Mendoza and Jujuy. C-banding revealed pericentromeric blocks of constitutive heterochromatin in most chromosomes. Acrocentric chromosomes involved in heteromorphisms showed high variation in the amount of heterochromatin within and among populations. Additionally, banding with fluorochromes (DAPI and chromomycin A3 revealed homologous localization of AT and GC rich regions among chromosomes of the different populations analyzed. Comparisons among heteromorphic pairs suggested, however, that the variation might be the result of complex chromosome rearrangements, involving possibly amplifications and/or deletions of heterochromatic segments. These results are in accordance with molecular studies that indicate genetic variability within and among the populations of this taxon.

  19. Chromosomal localization of 45S rDNA, sex-specific C values, and heterochromatin distribution in Coccinia grandis (L.) Voigt.

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    Bhowmick, Biplab Kumar; Yamamoto, Masashi; Jha, Sumita

    2016-01-01

    Coccinia grandis is a widely distributed dioecious cucurbit in India, with heteromorphic sex chromosomes and X-Y sex determination mode. The present study aids in the cytogenetic characterization of four native populations of this plant employing distribution patterns of 45S rDNA on chromosomes and guanine-cytosine (GC)-rich heterochromatin in the genome coupled with flow cytometric determination of genome sizes. Existence of four nucleolar chromosomes could be confirmed by the presence of four telomeric 45S rDNA signals in both male and female plants. All four 45S rDNA sites are rich in heterochromatin evident from the co-localization of telomeric chromomycin A (CMA)(+ve) signals. The size of 45S rDNA signal was found to differ between the homologues of one nucleolar chromosome pair. The distribution of heterochromatin is found to differ among the male and female populations. The average GC-rich heterochromatin content of male and female populations is 23.27 and 29.86 %, respectively. Moreover, the male plants have a genome size of 0.92 pg/2C while the female plants have a size of 0.73 pg/2C, reflecting a huge genomic divergence between the genders. The great variation in genome size is owing to the presence of Y chromosome in the male populations, playing a multifaceted role in sexual divergence in C. grandis. PMID:25795278

  20. Molecular cytogenetic studies in Chenopodium quinoa and Amaranthus caudatus

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    Jolanta Małuszyńska

    2014-02-01

    Full Text Available Chenopodium quinoa Wild. and Amaranthus caudatus L., two plant species from South America, have small and numerous chromosomes. Looking for chromosome markers to distinguish pairs of homologous chromosomes double fluorescence staining, in situ hybridization with 45S rDNA and silver staining were applied. Fluorescent in situ hybridization with 45S rDNA has shown two sites of hybridization occurring on one pair of chromosomes in qunion genre (lines PQ-1, PQ-8. The number of RDA loci in Amaranth's caudate L. genre depends on the accession. Kiwicha 3 line has one pair of chromosomes with signals and Kiwicha Molinera cultivar two pairs. All observed rDNA loci were active. After chromomycin/DAPI staining in all cases, except Kiwicha Molinera cultivar, the CMA3 positive bands co-localized with signals of in situ hybridization with rDNA. In Kiwicha Molinera the number of CMA+ bands was higher than the number of 45S rDNA signals after FISH.

  1. Etiology and Evaluation of Sperm Chromatin Anomalies

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    Marziyeh Tavalaee

    2008-01-01

    Full Text Available Evidence suggests that human sperm chromatin anomalies adversely affect reproductive outcomesand infertile men possess substantially amount of sperm with chromatin anomalies than fertilemen.Routine semen analysis evaluates parameters such as sperm motility and morphology, but doesnot examine the nuclear DNA integrity of spermatozoa. It has been suggested that altered nuclearchromatin structure or damaged DNA in spermatozoa could modify the special cellular functionsof human spermatozoa, and thereby affect the fertility potential. Intra-cytoplasmic sperm injection(ICSI bypass the barriers to fertilization for such a sperm, then the effect of chromatin anomalies onthe development remains a concern. Therefore, it is essential to develop and use accurate diagnostictests, which may provide better prognostic capabilities than the standard sperm assessments. Thisreview discusses our current understanding of the structure and organization of sperm DNA,the different procedures for assessment of sperm chromatin anomalies including comet assay,Chromomycin A3 (CMA3, sperm chromatin structure assay (SCSA, acridine orange test (AOT,terminal TdT-mediated dUTP-nick-end labelling (TUNEL assay, aniline blue and sperm chromatindispersion (SCD test and the impact of chromatin anomalies on reproductive outcome.

  2. Comparative cytogenetic study on two species of the genus Entedon Dalman, 1820 (Hymenoptera, Eulophidae using DNA-binding fluorochromes and molecular and immunofluorescent markers

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    Nadezhda Bolsheva

    2012-02-01

    Full Text Available Karyotypes of Entedon cionobius Thomson, 1878 and E. cioni Thomson, 1878 (Hymenoptera: Eulophidae were studied using DNA-binding ligands with different base specificity (propidium iodide, chromomycin A3, methyl green and DAPI; all these ligands, except for the last one, were used for the first time in parasitic wasps, C-banding, fluorescence in situ hybridization (FISH with a 45S rDNA probe and 5-methylcytosine immunodetection. Female karyotypes of both species contain five pairs of relatively large metacentric chromosomes and a pair of smaller acrocentric chromosomes (2n = 12. As in many other Hymenoptera, males of both Entedon Dalman, 1820 species have haploid chromosome sets (n = 6. Fluorochrome staining revealed chromosome-specific banding patterns that were similar between the different fluorochromes, except for the CMA3- and PI-positive and DAPI-negative band in the pericentromeric regions of the long arms of both acrocentric chromosomes. The obtained banding patterns were virtually identical in both species and allowed for the identification of each individual chromosome. C-banding revealed a pattern similar to DAPI staining, although centromeric and telomeric regions were stained more intensively using the former technique. FISH detected a single rDNA site in the same position on the acrocentric chromosomes as the bright CMA3-positive band. Immunodetection of 5-methylcytosine that was performed for the first time in the order Hymenoptera revealed 5-methylcytosine-rich sites in the telomeric, centromeric and certain interstitial regions of most of the chromosomes.

  3. A comparative cytogenetic study of Drosophila parasitoids (Hymenoptera, Figitidae) using DNA-binding fluorochromes and FISH with 45S rDNA probe.

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    Gokhman, Vladimir E; Bolsheva, Nadezhda L; Govind, Shubha; Muravenko, Olga V

    2016-06-01

    Karyotypes of Leptopilina boulardi (Barbotin, Carton et Keiner-Pillault, 1979) (n = 9), L. heterotoma (Thomson, 1862) (n = 10), L. victoriae Nordlander, 1980 (n = 10) and Ganaspis xanthopoda (Ashmead, 1896) (n = 9) (Hymenoptera, Figitidae) were studied using DNA-binding ligands with different base specificity [propidium iodide (PI), chromomycin A3 (CMA3) and 4',6-diamidino-2-phenylindole (DAPI)], and fluorescence in situ hybridization (FISH) with a 45S rDNA probe. Fluorochrome staining was similar between the different fluorochromes, except for a single CMA3- and PI-positive and DAPI-negative band per haploid karyotype of each species. FISH with 45S rDNA probe detected a single rDNA site in place of the bright CMA3-positive band, thus identifying the nucleolus organizing region (NOR). Chromosomal locations of NORs were similar for both L. heterotoma and L. victoriae, but strongly differed in L. boulardi as well as in G. xanthopoda. Phylogenetic aspects of NOR localization in all studied species are briefly discussed. PMID:27150102

  4. Cytogenetic analyses of two endemic fish species from the São Francisco River basin: Conorhynchus conirostris and Lophiosilurus alexandri (Siluriformes

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    Marilza Barbosa de Almeida Marques

    2008-01-01

    Full Text Available Two Siluriformes species endemic to the São Francisco River basin were characterized by conventional and differential cytogenetic analyses involving C-banding, Ag-nucleolar organizer region (NOR and chromomycin A3 (CMA3 staining, and FISH (fluorescent in situ hybridization with 18S and 5S rDNA probes. Conorhynchus conirostris presents a higher diploid number (2n = 60 than those detected in Pimelodidae representatives, whereas Lophiosilurus alexandri, with a karyotype of 2n = 54 chromosomes, presents a chromosomal constitution similar to that found in the family Pseudopimelodidae. Plesiomorphic characteristics such as single NORs at terminal positions are found in both species, as revealed by CMA3 and silver nitrate staining, and FISH with a 18S rDNA probe. C-banding evidenced centromeric and telomeric heterochromatic blocks distributed over most of the chromosomes with a conspicuous heterochromatin segment in a pair of submetacentric chromosomes in L. alexandri. Such karyotype data, if compared to the cytogenetic pattern of other Siluriformes species, can be partially related to their degree of endemism, favorable to the occurrence and fixation of chromosomal rearrangements. The present study in representatives from these two Siluriformes families from the São Francisco River contributes to a better understanding of the karyotype evolution in species of this important order of Neotropical fishes.

  5. New cases of supernumerary chromosomes in characiform fishes

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    Paulo Cesar Venere

    1999-09-01

    Full Text Available Supernumerary chromosomes were described for five species of Neotropical characiform fishes. These extra chromosomes were small, acrocentric and fully heterochromatic in Leporinus friderici from two different localities as well as in Leporinus sp., but metacentric and fully heterochromatic in Cyphocharax modesta and Prochilodus nigricans. In Characidium cf. zebra, this element was small, acrocentric and euchromatic. GC-rich DNA blocks were observed in the supernumerary chromosome of Leporinus sp. using chromomycin A3. The widespread occurrence of these extra chromosomal elements suggests their independent origins.São descritos os cromossomos supranumerários observados em cinco espécies de peixes pertencentes a quatro famílias distintas de caraciformes neotropicais. Esses cromossomos mostraram-se pequenos, totalmente heterocromáticos e acrocêntricos em Leporinus friderici e Leporinus sp. e metacêntricos e totalmente heterocromáticos em Cyphocharax modesta e Prochilodus nigricans. Em Characidium cf. zebra um pequeno extra acrocêntrico é visto totalmente eucromático. Um pequeno segmento rico em pares de bases GC pôde ser observado no cromossomo extra de Leporinus sp. após a coloração com cromomicina A3. Alguns aspectos relacionados à origem desses cromossomos extras entre os caraciformes são discutidos.

  6. Comparative cytogenetics of two endangered leuciscine fish, Squalius aradensis and S. torgalensis (Teleostei, Cyprinidae, from the Iberian Peninsula

    Directory of Open Access Journals (Sweden)

    Catarina Nabais

    2013-03-01

    Full Text Available In this study, the description of the karyotypes of the endangered chubs Squalius aradensis (Coelho, Bogutskaya, Rodrigues and Collares-Pereira, 1998 and Squalius torgalensis (Coelho, Bogutskaya, Rodrigues and Collares-Pereira, 1998 is presented by means of conventional (Giemsa-staining, Chromomycin A3 (CMA3-fluorescence, Silver-impregnation (Ag-NORs and molecular (fluorescence in situ hybridization (FISH with 18S rDNA probe protocols. These endemic sister-species have an allopatric but adjacent distribution in the most southwestern part of the Iberian Peninsula. Diploid chromosome number was invariably 2n = 50 and karyotypes of both species were grossly similar, composed of metacentric and submetacentric elements with a reduced number of acrocentric pairs. Sequential staining using FISH with an 18S rDNA probe, CMA3 and Ag-NORs treatments revealed consistent positive signals located at the end of the short arms of a submetacentric chromosome pair, likely homologous in both species. While providing useful cytogenetic comparative data against other members of the genus Squalius Bonaparte, 1837, the work aimed to draw attention towards the conservation of two narrow-range and highly confined fish species.

  7. Genome evolution in alpine oat-like grasses through homoploid hybridization and polyploidy

    Science.gov (United States)

    Winterfeld, Grit; Wölk, Alexandra; Röser, Martin

    2016-01-01

    Hybridization and polyploidization can radically impact genome organization from sequence level to chromosome structure. As a result, often in response to environmental change and species isolation, the development of novel traits can arise and will tend to result in the formation of homoploid or polyploid hybrid species. In this study we focus on evidence of hybridization and polyploidization by ascertaining the species parentage of the endemic alpine Helictotrichon parlatorei group. This group comprises five taxa; the diploids H. parlatorei, Helictotrichon setaceum subsp. setaceum and subsp. petzense, their putative hybrid Helictotrichon ×krischae and the hexaploid Helictotrichon sempervirens. For molecular analyses, cloned nuclear Topoisomerase VI genes of H. sempervirens and H. ×krischae were sequenced and compared with sequences of the diploids to estimate the evolutionary history in this group. In addition, detailed chromosome studies were carried out including fluorescence in situ hybridization (FISH) with 5S and 45S ribosomal and satellite DNA probes, and fluorochrome staining with chromomycin and DAPI. Two distinct types of Topoisomerase VI sequences were identified. One of them (SET) occurs in both subspecies of H. setaceum, the other (PAR) in H. parlatorei. Both types were found in H. ×krischae and H. sempervirens. Karyotypes of H. parlatorei and H. setaceum could be distinguished by chromosomes with a clearly differentiated banding pattern of ribosomal DNAs. Both patterns occurred in the hybrid H. ×krischae. Hexaploid H. sempervirens shares karyotype features with diploid H. parlatorei, but lacks the expected chromosome characteristics of H. setaceum, possibly an example of beginning diploidization after polyploidization. The geographic origin of the putative parental species and their hybrids and the possible biogeographical spread through the Alps are discussed. PMID:27255513

  8. Evolutionary trends in the family Curimatidae (Characiformes): inferences from chromosome banding.

    Science.gov (United States)

    Sampaio, Tatiane Ramos; Pires, Larissa Bettin; Venturelli, Natália Bortolazzi; Usso, Mariana Campaner; da Rosa, Renata; Dias, Ana Lúcia

    2016-01-01

    The family Curimatidae is a fish group usually considered chromosomally conserved in their diploid number. However, some studies show small changes in the karyotype microstructure, and the presence of B chromosomes, indicating a chromosomal diversification within the group, even if structural changes in the karyotypes are not visible. Few studies associate this trait with an evolutionary pattern within the family. This study aimed to characterize the karyotype, nucleolus organizer regions (NORs), and heterochromatin distribution of six species of Curimatidae of the genera Cyphocharax Fowler, 1906 and Steindachnerina Fowler, 1906: Cyphocharax voga (Hensel, 1870), Cyphocharax spilotus (Vari, 1987), Cyphocharax saladensis (Meinken, 1933), Cyphocharax modestus (Fernández-Yépez, 1948), Steindachnerina biornata (Braga et Azpelicueta, 1987) and Steindachnerina insculpta (Fernández-Yépez, 1948) and contribute data to a better understanding of the mechanisms involved in the chromosomal evolution of this group of fish. All specimens had 2n=54, m-sm, and B microchromosomes. Five species exhibited single NORs, except for Steindachnerina biornata, which showed a multiple pattern of ribosomal sites. NORs were chromomycin A3 positive (CMA3 (+)) and 4'-6-diamino-2-phenylindole (DAPI(-)) negative, exhibiting differences in the pair and chromosomal location of each individual of the species. FISH with 5S rDNA probe revealed sites in the pericentrometic position of a pair of chromosomes of five species. However, another site was detected on a metacentric chromosome of Cyphocharax spilotus. Heterochromatin distributed both in the pericentromeric and some terminal regions was revealed to be CMA3 (+)/DAPI(-). These data associated with the previously existing ones confirm that, although Curimatidae have a very conservative karyotype macrostructure, NORs and heterochromatin variability are caused by mechanisms of chromosome alterations, such as translocations and/or inversions

  9. Genetic fidelity assessment in micropropagated plants using cytogenetical analysis and heterochromatin distribution: a case study with Nepenthes khasiana Hook f.

    Science.gov (United States)

    Devi, Soibam Purnima; Kumaria, Suman; Rao, Satyawada Rama; Tandon, Pramod

    2015-09-01

    Rapid clonal propagation of selected genotypes has been one of the most extensively exploited approaches of biotechnology. However, inclusion of somaclonal variations in tissue-culture-derived plants results in the production of undesirable plant off-types which limits its applications in tissue culture industry. Therefore, the most critical concern has been the maintenance of genetic uniformity of micropropagated plants. Assessment of genetic fidelity in tissue-culture-raised plants of three consecutive regenerations of Nepenthes khasiana has been successfully carried out using chromosome counts and heterochromatin distribution pattern wherein changes in the number of chromosomes and the distribution of AT and GC base pairs were recorded. The cells studied in the plantlets of the first regeneration (23.33 %) showed deviant number of chromosome which was increased to 33.33 % and 40 % in the plantlets of the second and the third regenerations, respectively. Also, 4',6-diamidino-2-phenylindole (DAPI)(+) and chromomycin A3 (CMA)(+) binding sites, on an average of 5.74 ± 0.47 and 5.00 ± 0.30, were observed in the plantlets of the first regeneration. Subsequently, DAPI(+) binding sites were increased to 6.61 ± 0.39 and 6.74 ± 0.57 in the plantlets of the second and the third regenerations, respectively, with a corresponding decrease in the CMA(+) binding sites (4.63 ± 0.45 and 4.16 ± 0.47 CMA(+) sites in the plantlets of the second and the third regenerations, respectively). The study reveals an increase in cytological variations in the morphologically similar micropropagated plants of N. khasiana with the subsequent regenerations which further necessitate the determination of genetic integrity of micropropagated plants. PMID:25616932

  10. Karyotype characterization, constitutive heterochromatin and nucleolus organizer regions of Paranaita opima (Coleoptera, Chrysomelidae, Alticinae

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    Mara Cristina de Almeida

    2006-01-01

    Full Text Available Species of the subtribe Oedionychina not only have a highly uniform diploid number of 2n = 22 (20+X+y but have the karyotypic peculiarity of possessing extremely large sex chromosomes. We analyzed Paranaita opima embryos and gonadal cells to determine their diploid number, chromosomal morphology, type of sex determination system, constitutive heterochromatin pattern and which chromosomes bear nucleolus organizer regions (NORs. The diploid number of P. opima was 2n = 22 (20+XY/XX with all chromosomes being metacentric. Chromosome pair 6 showed an interstitial secondary constriction on the short arm. The C-banding technique revealed centromeric constitutive heterochromatin in all chromosomes, which, in pair 6, extended up to the secondary constriction of the short arm, additional C-bands also being present on the Y chromosome. Silver nitrate nucleolar organizer region (Ag-NOR staining showed NORs on the secondary constriction of pair 6. Fluorochrome analysis with chromomycin A3 (CMA3, 4'-6-diamidino-2-phenylindole (DAPI and the distamycin A (DA counterstain showed that the short arm of chromosome pair 6 exhibited a GC-rich block extending from the proximal to the median region, including part of the secondary constriction. The same techniques also showed AT-rich blocks at the centromeric region of all chromosomes and at the terminal region of the short arm of pair 6. The basic karyotype characteristics and C band pattern of P. opima are similar to those described for other species in the subtribe Oedionychina. The pattern of autosomal NORs observed in P. opima corresponds to that registered in the majority of the Chrysomelidae species.

  11. A Preliminary Study: N-acetyl-L-cysteine Improves Semen Quality following Varicocelectomy

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    Foroogh Barekat

    2016-05-01

    Full Text Available Background: Surgery is considered the primary treatment for male infertility from clinical varicocele. One of the main events associated with varicocele is excessive production of reactive oxygen species (ROS. N-acetyl-L-cysteine (NAC, an antioxidant that scavenges free radicals, is considered a supplement to alleviate glutathione (GSH depletion during oxidative stress. Despite beneficial effects of NAC in other pathological events, there is no report on the effect of NAC in individuals with varicocele. Therefore, the aim of this study is to evaluate the outcome of NAC on semen quality, protamine content, DNA damage, oxidative stress and fertility following varicocelectomy. Materials and Methods: This prospective clinical trial included 35 infertile men with varicocele randomly divided into control (n=20 and NAC (n=15 groups. We assessed semen parameters, protamine content [chromomycin A3 (CMA3], DNA integrity [terminal deoxynucleotidyltransferase-mediated dUTP nick-end labeling (TUNEL] and oxidative stress [2', 7'-dichlorodihydrofluorescein-diacetate (DCFH-DA] before and three months after varicocelectomy. Results: Percentage of abnormal semen parameters, protamine deficiency, DNA fragmentation and oxidative stress were significantly decreased in both groups compared to before surgery. We calculated the percentage of improvement in these parameters compared to before surgery for each group, then compared the results between the groups. Only percentage of protamine deficiency and DNA fragmentation significantly differed between the NAC and control groups. Conclusion: The results of this study, for the first time, revealed that NAC improved chromatin integrity and pregnancy rate when administered as adjunct therapy post-varicocelectomy (Registeration Number: IRCT201508177223N5.

  12. Genomic Characterization of the Chili Peppers (Capsicum Solanaceae) Germplasm by Classical and Molecular Cytogenetics

    International Nuclear Information System (INIS)

    Within the framework of the IAEA coordinated research project entitled 'Physical mapping technologies for the identification and characterization of mutated genes contributing to crop quality' we carried out genomic characterization of wild and cultivated samples of chilli peppers (genus Capsicum) by classical chromosome staining methods (AgNOR and fluorescent chromosome banding) and fluorescent in situ hybridization (FISH). For the first approach, fluorochromes with affinity for specific chromosome regions were used, i.e. chromomycin A3 (CMA) and diamidino-phenyl-indole (DAPI) which have preference for GC-rich and AT-rich regions, respectively. In addition, Ag-staining to detect active nucleolus organizing regions was applied. The heterochromatin could be characterized in respect to type, amount and distribution in the different accessions examined. On the other hand, the number and position of active NORs could be determined. Using FISH, different DNA probes were used in order to map specific sequences in the chromosomes, i.e. 45S and 5S rDNA, telomeric sequences and cloned restriction fragments of repetitive nature. As an example of the work done, we present the results obtained on a sample of Capsicum annuum var. annum (cultivar NMCA 10272), the most broadly exploited cultivar of chilli pepper. The results allowed us to characterize the Capsicum species and accessions and the possible evolutionary pathways for chilli peppers was deduced based on the available cytogenetic data. It is worth mentioning that the research work done under this CRP is part of work being done within an exsting network of chilli pepper research of this important plant group utilized by man and among one of the first cultivated plants in the history of humanity. (author)

  13. Genetic damage caused by methyl-parathion in mouse spermatozoa is related to oxidative stress

    International Nuclear Information System (INIS)

    Organophosphorous (OP) pesticides are considered genotoxic mainly to somatic cells, but results are not conclusive. Few studies have reported OP alterations on sperm chromatin and DNA, and oxidative stress has been related to their toxicity. Sperm cells are very sensitive to oxidative damage which has been associated with reproductive dysfunctions. We evaluated the effects of methyl-parathion (Me-Pa; a widely used OP) on sperm DNA, exploring the sensitive stage(s) of spermatogenesis and the relationship with oxidative stress. Male mice (10-12-weeks old) were administered Me-Pa (3-20 mg/kg bw/i.p.) and euthanized at 7- or 28-days post-treatment. Mature spermatozoa were obtained and evaluated for chromatin structure through SCSA (Sperm Chromatin Structure Assay; DNA Fragmentation Index parameters: Mean DFI and DFI%) and chromomycin-A3 (CMA3)-staining, for DNA damage through in situ-nick translation (NT-positive) and for oxidative stress through lipid peroxidation (LPO; malondialdehyde production). At 7-days post-treatment (mature spermatozoa when Me-Pa exposure), dose-dependent alterations in chromatin structure (Mean DFI and CMA3-staining) were observed, as well as increased DNA damage, from 2-5-fold in DFI% and NT-positive cells. Chromatin alterations and DNA damage were also observed at 28-days post-treatment (cells at meiosis at the time of exposure); suggesting that the damage induced in spermatocytes was not repaired. Positive correlations were observed between LPO and sperm DNA-related parameters. These data suggest that oxidative stress is related to Me-Pa alterations on sperm DNA integrity and cells at meiosis (28-days post-treatment) and epididymal maturation (7-days post-treatment) are Me-Pa targets. These findings suggest a potential risk of Me-Pa to the offspring after transmission

  14. Reproductive function and biological dosimetry prospective study of young thyroid differentiated cancer patients treated with I-131

    International Nuclear Information System (INIS)

    The administration of I-131 in the management of differentiated thyroid cancer (DTC) is a well established practice. As the spermatogonia is highly sensitive to radiation, large doses of internal radiation could result in adverse effects on reproductive function such as oligo/azoospermia and infertility. During spermiogenesis, mammalian chromatin undergoes replacement of nuclear histones by protamines, which yields a DNA sixfold more highly condensed in spermatozoa than in mitotic chromosomes. The structure of this highly packaged chromatin shows a low binding capacity for several fluorochromes and dyes such as chromomycin A3 (CMA3). The aim of this study is to assess the correlation between reproductive function (endocrine and exocrine testicular function, and levels of CMA3 stainability) and biological dosimetry in a prospective study of 4 young DTC patients treated with I-131. In this context, a background level of CMA3 binding in mature human sperm was established. It revealed a variable accessibility of CMA3 to the DNA that is dependant on packaging quality and thus, indicative of protamine deficiency. The identification of altered stainability suggests DNA damage as well as epigenetic effects, which may be indicators of male infertility. Transient impairment of spermatogenesis associated with an increase in FSH, an altered spermiogram and even azoospermia was observed after the administration of cumulative activities. Overall, testosterone levels were preserved, except in one case, which presented a drastically diminished value associated with an increase in LH level. As peripheral blood lymphocytes and spermatogonia have equivalent radiosensitivity (interphase death) we hypothesize that the knowledge of DNA damage recovery in peripheral lymphocytes could correlate with spermatogonia recovery and with FSH evolution. (authors)

  15. Genome evolution in alpine oat-like grasses through homoploid hybridization and polyploidy.

    Science.gov (United States)

    Winterfeld, Grit; Wölk, Alexandra; Röser, Martin

    2016-01-01

    Hybridization and polyploidization can radically impact genome organization from sequence level to chromosome structure. As a result, often in response to environmental change and species isolation, the development of novel traits can arise and will tend to result in the formation of homoploid or polyploid hybrid species. In this study we focus on evidence of hybridization and polyploidization by ascertaining the species parentage of the endemic alpine Helictotrichon parlatorei group. This group comprises five taxa; the diploids H. parlatorei, Helictotrichon setaceum subsp. setaceum and subsp. petzense, their putative hybrid Helictotrichon ×krischae and the hexaploid Helictotrichon sempervirens. For molecular analyses, cloned nuclear Topoisomerase VI genes of H. sempervirens and H. ×krischae were sequenced and compared with sequences of the diploids to estimate the evolutionary history in this group. In addition, detailed chromosome studies were carried out including fluorescence in situ hybridization (FISH) with 5S and 45S ribosomal and satellite DNA probes, and fluorochrome staining with chromomycin and DAPI. Two distinct types of Topoisomerase VI sequences were identified. One of them (SET) occurs in both subspecies of H. setaceum, the other (PAR) in H. parlatorei. Both types were found in H. ×krischae and H. sempervirens Karyotypes of H. parlatorei and H. setaceum could be distinguished by chromosomes with a clearly differentiated banding pattern of ribosomal DNAs. Both patterns occurred in the hybrid H. ×krischae Hexaploid H. sempervirens shares karyotype features with diploid H. parlatorei, but lacks the expected chromosome characteristics of H. setaceum, possibly an example of beginning diploidization after polyploidization. The geographic origin of the putative parental species and their hybrids and the possible biogeographical spread through the Alps are discussed. PMID:27255513

  16. Analysis of a valuable chromosome rearrangement induced by ionizing radiations in a cultivated chili pepper line (Capsicum baccatum var. Pendulum - solanaceae)

    International Nuclear Information System (INIS)

    Capsicum (chili peppers) is an important genus including five crop species consumed by man as spice and food. Most contributions about induced mutagenesis in Capsicum refer to gene mutations while induced changes at chromosome level are scarce. We started a program to achieve chromosome rearrangements by ionizing radiations in C. baccatum variety pendulum cultivar 'cayenne', which has a karyotype with 2n=2x=24, 11 metacentrics + 1 subtelocentric pairs, 4 pairs (1, 3, 10, 12) carrying nucleolar organizing regions (NORs) and associated satellites in short arm. Seeds were treated with different acute doses of X-rays developing M1-4 generations. A rearranged chromosome carrying NORs in both arms was found in M2 seedlings from the only surviving M1 plant after a 300 Gy treatment. The structural change was analyzed by: 1) Feulgen's staining to observe chromosome number, size and shape; 2) silver impregnation to detect active NORs; 3) fluorescent chromosome banding to reveal type and position of constitutive heterochromatic regions [triple staining with chromomycin/distamycin/4-6-diamidino-2-phenylindole (CMA/DA/DAPI)]; 4) fluorescent in situ hybridization with 18S- 25S rDNA repeated sequence as probe. A reciprocal translocation between two NOR-bearing chromosomes in the M1 plant has occurred, which gave viable progeny carrying the chromosomal interchange without any deviating phenotype after four generations, nor in heterozygous neither in homozygous condition. The lack of chromosome instability suggests a small reciprocal interchange between a member of pair 1 and of 3, both carrying active NORs in shorts arms. The results of this rearrangement were two chromosomes with little change in size, one of them easily recognized by the presence of NORs and associated CMA+/DAPI- heterochromatin in both arms. As the translocation here reported produced a conspicuous rearranged marker chromosome, the obtained plant line is considered very valuable for studies on chromosome

  17. Chromosomal evidence for a putative cryptic species in the Gymnotus carapo species-complex (Gymnotiformes, Gymnotidae

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    De Souza Augusto CP

    2008-11-01

    Full Text Available Abstract Background In this study we examined the karyotypes of morphologically indistinguishable populations of the electric knifefish Gymnotus carapo sensu stricto from the Eastern Amazon of Brazil. These were identified unambiguously on the basis of external morphology, meristics, and pigmentation. Results Specimens from one of five localities exhibited a karyotype previously not documented for Gymnotus species in the Amazon basin: 2n = 40 (34M/SM+6ST/A. Samples from the other four localities exhibited a different karyotype: 2n = 42 (30M/SM+12ST/A, which we had previously described. Specimens from all five localities presented constitutive heterochromatin in the centromeric region of almost all chromosomes, including in the distal and interstitial regions. Staining with 4'6-Diamidino-2-phenylindole revealed C-positive banding. In both karyotypes the Nucleolar Organizer Region (NOR was located on the short arm of pair 20, and Chromomycin A3 stained the NORs. Fluorescent in situ hybridization with telomeric probes showed an Interstitial Telomeric Sequence (ITS in the proximal short arm of a metacentric pair in the 2n = 40 karyotype. Conclusion The difference between the two karyotypes on the diploid number and chromosome morphology can be explained by rearrangements of the fusion-fission type and also by pericentric inversions. The presence of ITS in a metacentric pair of the 2n = 40 karyotype suggests that the difference in the diploid number of the karyotypes results from a fusion. The consistent 2n = 42 karyotype at four localities suggests an interbreeding population. However, because fusion-fission and pericentric inversions of this nature typically result in reproductive isolation, we speculate that the form with the 2n = 40 karyotype is a different species to that of the 2n = 42 form. Nonetheless, we did not observe evident differences in external morphology, meristics and pigmentation between the two forms, which suggest that they

  18. Molecular cytogenetic characterization of some representatives of the subgenera Artemisia and Absinthium (genus Artemisia, Asteraceae

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    Vallès, J.

    2008-12-01

    Full Text Available A molecular cytogenetic study has been performed in three species of the genus Artemisia, complementing previous works on two subgenera that had been scarcely studied from this standpoint, Artemisia ( A. chamaemelifolia, A. vulgaris and Absinthium ( A. absinthium. Chromomycin A3 and 4',6-diamidino-2-phenylindole (DAPI banding have been carried out, as well as fluorescent in situ hybridization (FISH of 5S and 18S-5.8S-26S ribosomal DNA. Morphometrical data of karyotype characters were calculated and idiograms with the position of the AT- and GC-rich regions as well as rDNA loci were constructed. Colocalization of most of these regions has been observed, confirming previous findings in this genus. Both ribosomal DNA appear always colocalized, which is a distinct feature with respect to most angiosperms surveyed. Regarding the differential characteristics of each species, a symmetrical karyotype has been found in the species studied. Artemisia absinthium shows long chromosomes and absence of centromeric banding signals that, conversely, are absent in A. vulgaris andA. chamaemelifolia. The last species also presents B-chromosomes in which ribosomal DNA and heterochromatin have been detected. Despite these differences, karyotype morphology and signal pattern of the three species are quite coincidental. This might reflect a close phylogenetic relationship between both subgenera, which is consistent with the available molecular phylogenies presenting species of the subgenera Artemisia and Absinthium intermixed.

    Se ha llevado a cabo un estudio citogenético molecular en tres especies del género Artemisia, que complementa trabajos previos sobre dos subgéneros que han sido poco estudiados desde este punto de vista, Artemisia (A. chamaemelifolia, A. vulgaris y Absinthium (A. absinthium. Se han efectuado tinciones de bandeo con cromomicina A3

  19. Reproductive Incompatibility Involving Senegalese Aedes aegypti (L) Is Associated with Chromosome Rearrangements

    Science.gov (United States)

    Dickson, Laura B.; Sharakhova, Maria V.; Timoshevskiy, Vladimir A.; Fleming, Karen L.; Caspary, Alex; Sylla, Massamba; Black, William C.

    2016-01-01

    was used to identify AT-rich regions, chromomycin A3 following pretreatment with barium hydroxide stained for GC-rich regions and stained the ribosomal RNA locus and YOYO-1 was used to test for differential staining. Chromosome patterns in SenAae strains revealed by these three stains differed from those in IB12. For FISH, 40 BAC clones previously physically mapped on Aaa chromosomes were used to test for chromosome rearrangements in SenAae relative to IB12. Differences in the order of markers identified two chromosomal rearrangements between IB12 and SenAae strains. The first rearrangement involves two overlapping pericentric (containing the centromere) inversions in chromosome 3 or an insertion of a large fragment into the 3q arm. The second rearrangement is close to the centromere on the p arm of chromosome 2. Linkage analysis of the SDL and the white-eye locus identified a likely chromosomal rearrangement on chromosome 1. The reproductive incompatibility observed within SenAae and between SenAae and Aaa may be generally associated with chromosome rearrangements on all three chromosomes and specifically caused by pericentric inversions on chromosomes 2 and 3. PMID:27105225

  20. Reproductive Incompatibility Involving Senegalese Aedes aegypti (L) Is Associated with Chromosome Rearrangements.

    Science.gov (United States)

    Dickson, Laura B; Sharakhova, Maria V; Timoshevskiy, Vladimir A; Fleming, Karen L; Caspary, Alex; Sylla, Massamba; Black, William C

    2016-04-01

    used to identify AT-rich regions, chromomycin A3 following pretreatment with barium hydroxide stained for GC-rich regions and stained the ribosomal RNA locus and YOYO-1 was used to test for differential staining. Chromosome patterns in SenAae strains revealed by these three stains differed from those in IB12. For FISH, 40 BAC clones previously physically mapped on Aaa chromosomes were used to test for chromosome rearrangements in SenAae relative to IB12. Differences in the order of markers identified two chromosomal rearrangements between IB12 and SenAae strains. The first rearrangement involves two overlapping pericentric (containing the centromere) inversions in chromosome 3 or an insertion of a large fragment into the 3q arm. The second rearrangement is close to the centromere on the p arm of chromosome 2. Linkage analysis of the SDL and the white-eye locus identified a likely chromosomal rearrangement on chromosome 1. The reproductive incompatibility observed within SenAae and between SenAae and Aaa may be generally associated with chromosome rearrangements on all three chromosomes and specifically caused by pericentric inversions on chromosomes 2 and 3. PMID:27105225