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Table of Contents
Vol. 95, No. 1-2, 2001
Issue release date: 2001
Section title: Animal Cytogenetics and Comparative Mapping
Cytogenet Cell Genet 95:73–78 (2001)
(DOI:10.1159/000057020)

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

de Almeida-Toledo L.F.a · Foresti F.b · Péquignot E.V.c · Daniel-Silva M.F.Z.a
aDepartamento de Biologia, Instituto de Biociências, USP, São Paulo, bDepartamento de Morfologia, Instituto de Biociências, UNESP, Botucatu (Brazil); cU 383 INSERM, Hôpital Necker-Enfants Malades, Paris (France)

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Article / Publication Details

First-Page Preview
Abstract of Animal Cytogenetics and Comparative Mapping

Published online: April 19, 2002
Issue release date: 2001

Number of Print Pages: 6
Number of Figures: 6
Number of Tables: 1

ISSN: 1424-8581 (Print)
eISSN: 1424-859X (Online)

For additional information: http://www.karger.com/CGR

Abstract

An 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.   

© 2002 S. Karger AG, Basel


Article / Publication Details

First-Page Preview
Abstract of Animal Cytogenetics and Comparative Mapping

Published online: April 19, 2002
Issue release date: 2001

Number of Print Pages: 6
Number of Figures: 6
Number of Tables: 1

ISSN: 1424-8581 (Print)
eISSN: 1424-859X (Online)

For additional information: http://www.karger.com/CGR


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