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. [UNESP]
dc.contributor.authorPéquignot, E. V.
dc.contributor.authorDaniel-Silva, M. F.Z.
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)
dc.contributor.institutionHôpital Necker-Enfants Malades
dc.date.accessioned2022-04-28T19:55:22Z
dc.date.available2022-04-28T19:55:22Z
dc.date.issued2001-12-01
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 Paraná river system (Brazil). Cytogenetic studies carried out in the two populations showed that the Mogi-Guaçu population is characterized by 2n = 38 chromosomes and undifferentiated sex chromosomes and the Tietê 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. Copyright © 2002 S. Karger AG, Basel.en
dc.description.affiliationDepartamento de Biologia Instituto de Biociências USP, São Paulo
dc.description.affiliationDepartamento de Morfologia Instituto de Biociências UNESP, Botucatu
dc.description.affiliationU 383 INSERM Hôpital Necker-Enfants Malades, Paris
dc.description.affiliationDepartamento de Biologia Instituto de Biociências Universidade de São Paulo, Caixa Postal 11.461, 05422-970 São Paulo, SP
dc.description.affiliationUnespDepartamento de Morfologia Instituto de Biociências UNESP, Botucatu
dc.format.extent73-78
dc.identifier.citationCytogenetics and Cell Genetics, v. 95, n. 1-2, p. 73-78, 2001.
dc.identifier.issn0301-0171
dc.identifier.scopus2-s2.0-0035736160
dc.identifier.urihttp://hdl.handle.net/11449/224225
dc.language.isoeng
dc.relation.ispartofCytogenetics and Cell Genetics
dc.sourceScopus
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

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