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The X1X2Y sex chromosome system in the fish Hoplias malabaricus. I. G-, C- and chromosome replication banding

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Abstract

Hoplias malabaricus, a widely distributed neotropical fish (Central America to Argentina), may represent a group of distinct species showing diversified cytotypes with respect to chromosome number, morphology and sex systems. One of these karyotypic forms is characterized by an X1X1X2X2/X1X2Y sex chromosome system, with 2n= 40 and 39 chromosomes in females and males respectively. Analyses with G-, C- and chromosome replication banding permitted a better characterization of the sex chromosomes in this cytotype. The Y chromosome, unique in males, resulted from a translocation event between two biarmed chromosomes: one similar to chromosome 6 (X1) and the other one similar to chromosome 20 (X2), the latter corresponding to a probable identification. On the basis of the observed banding patterns, the Y chromosome may represent a stable dicentric, with an inactive centromere interstitially located on its long arm. The results are also related to a specific satellite DNA subfamily, previously characterized in Hoplias malabaricus, which appears to be associated with the X1 chromosome.

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Authors and Affiliations

  1. Departamento de Genetica e Evolucao, Universidade Federal de Sao Carlos, C.P. 676, 13565-905, Sao Carlos, SP, Brazil

    Luiz A. C. Bertollo & Michel S. Fontes

  2. Departamento de Genetica, Facultad de Ciencias Exactas, Quimicas y Naturales, Universidad Nacional de Misiones, Felix de Azara 1552, 3300, Posadas Misiones, Argentina

    Alberto S. Fenocchio

  3. Departamento de Biologia Celular y Genetica, Facultad de Ciencias, Universidad de Malaga, Campus Universitario de Teatinos, 29071, Malaga, Spain

    Jesus Cano

Authors
  1. Luiz A. C. Bertollo
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  2. Michel S. Fontes
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  3. Alberto S. Fenocchio
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  4. Jesus Cano
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Bertollo, L.A.C., Fontes, M.S., Fenocchio, A.S. et al. The X1X2Y sex chromosome system in the fish Hoplias malabaricus. I. G-, C- and chromosome replication banding. Chromosome Res 5, 493–499 (1997). https://doi.org/10.1023/A:1018477232354

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