XX : XY sex chromosome system with X heterochromatinization: an early stage of sex chromosome differentiation in the Neotropic electric eel Eigenmannia virescens

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dc.contributor.authorde Almeida-Toledo, L. F.
dc.contributor.authorForesti, F.
dc.contributor.authorPequignot, E. V.
dc.contributor.authorDaniel-Silva, MFZ
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionHop Necker Enfants Malad
dc.date.accessioned2014-05-20T13:51:32Z
dc.date.available2014-05-20T13:51:32Z
dc.date.issued2001-01-01
dc.description.abstractAn early stage of sex chromosome differentiation is reported to occur in the electric eel Eigenmannia virescens (Pisces, Sternopygidae) from populations of two tributaries of the Parana river system (Brazil). Cytogenetic studies carried out in the two populations showed that the Mogi-Guacu population is characterized by 2n = 38 chromosomes and undifferentiated sex chromosomes and the Tiete population presents 2n = 38 both for males and females and an XX:XY sex chromosome system. The X-chromosome is acrocentric, easily recognized by the presence of a conspicuous heterochromatin block in its distal portion; the Y-chromosome is probably one of the medium sized acrocentrics present in the male karyotype. BrdU induced R-bands of the two populations did not reveal any difference in the euchromatic regions of the chromosomes. AluI and HaeIII restriction enzyme digestion patterns and chromomycin A3 staining of the X-chromosome are presented. The possible role of heterochromatinization in the evolution of sex chromosomes in fish is discussed.en
dc.description.affiliationUniv São Paulo, Dept Biol, Inst Biociencias, BR-05422970 São Paulo, Brazil
dc.description.affiliationUniv Estadual Paulista Julio Mesquita Filho, Dept Morfol, Inst Biociencias, Botucatu, SP, Brazil
dc.description.affiliationHop Necker Enfants Malad, U383 INSERM, Paris, France
dc.description.affiliationUnespUniv Estadual Paulista Julio Mesquita Filho, Dept Morfol, Inst Biociencias, Botucatu, SP, Brazil
dc.format.extent73-78
dc.identifierhttp://dx.doi.org/10.1159/000057020
dc.identifier.citationCytogenetics and Cell Genetics. Basel: Karger, v. 95, n. 1-2, p. 73-78, 2001.
dc.identifier.doi10.1159/000057020
dc.identifier.issn0301-0171
dc.identifier.lattes0804793944846367
dc.identifier.urihttp://hdl.handle.net/11449/18437
dc.identifier.wosWOS:000175422100013
dc.language.isoeng
dc.publisherKarger
dc.relation.ispartofCytogenetics and Cell Genetics
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.titleXX : XY sex chromosome system with X heterochromatinization: an early stage of sex chromosome differentiation in the Neotropic electric eel Eigenmannia virescensen
dc.typeArtigo
dcterms.licensehttp://www.karger.com/Services/RightsPermissions
dcterms.rightsHolderKarger
unesp.author.lattes0804793944846367
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Biociências, Botucatupt

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