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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Autor(es): dc.contributorUniversidade de São Paulo (USP)-
Autor(es): dc.contributorUniversidade Estadual Paulista (UNESP)-
Autor(es): dc.contributorHôpital Necker-Enfants Malades-
Autor(es): dc.creatorDe Almeida-Toledo, L. F.-
Autor(es): dc.creatorForesti, F.-
Autor(es): dc.creatorPéquignot, E. V.-
Autor(es): dc.creatorDaniel-Silva, M. F.Z.-
Data de aceite: dc.date.accessioned2025-08-21T22:09:06Z-
Data de disponibilização: dc.date.available2025-08-21T22:09:06Z-
Data de envio: dc.date.issued2022-04-28-
Data de envio: dc.date.issued2022-04-28-
Data de envio: dc.date.issued2001-12-01-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/224225-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/224225-
Descrição: dc.descriptionAn 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.-
Descrição: dc.descriptionDepartamento de Biologia Instituto de Biociências USP, São Paulo-
Descrição: dc.descriptionDepartamento de Morfologia Instituto de Biociências UNESP, Botucatu-
Descrição: dc.descriptionU 383 INSERM Hôpital Necker-Enfants Malades, Paris-
Descrição: dc.descriptionDepartamento de Biologia Instituto de Biociências Universidade de São Paulo, Caixa Postal 11.461, 05422-970 São Paulo, SP-
Descrição: dc.descriptionDepartamento de Morfologia Instituto de Biociências UNESP, Botucatu-
Formato: dc.format73-78-
Idioma: dc.languageen-
Relação: dc.relationCytogenetics and Cell Genetics-
???dc.source???: dc.sourceScopus-
Título: dc.titleXX:XY sex chromosome system with X heterochromatinization: An early stage of sex chromosome differentiation in the neotropic electric eel Eigenmannia virescens-
Tipo de arquivo: dc.typelivro digital-
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