Chromosomal polymorphism in Steindachneridionmelanodermatum Garavello, 2005 (Siluriformes, Pimelodidae): a reappraisal the existence of sex chromosome system in the species

  • Daniele Aparecida Matoso
  • Vera Maria Fonseca de Almeida Val
  • Maelin da  Silva
  • Américo Moraes-Neto
  • Mara Cristina Almeida
  • Marcelo Ricardo Vicari
  • Orlando Moreira-Filho
  • Roberto Ferreira Artoni
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DOI: 10.1007/s11160-011-9201-2

Cite this article as:
Matoso, D.A., de Almeida Val, V.M.F., da Silva, M. et al. Rev Fish Biol Fisheries (2011) 21: 497. doi:10.1007/s11160-011-9201-2

Abstract

Fifty-five specimens of Steindachneridion melanodermatum were analyzed using molecular and conventional cytogenetic tools. Two polymorphisms were found: one involving the length of nucleolar organizer regions and another involving two submetacentric chromosomes previously identified as sex chromosomes. The polymorphism was confirmed by homogeneity between male and female karyotypes. Nucleotide sequencing and physical chromosome mapping were also used to identify and characterize one class of repetitive DNA, named SmAluI-Rex3. Based on the results and literature the present study offers an update of the occurrence of sex chromosome system in this species.

Keywords

Evolutionary biology Karyotype evolution Sex differentiation Retrotransposon 

Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  • Daniele Aparecida Matoso
    • 1
  • Vera Maria Fonseca de Almeida Val
    • 1
  • Maelin da  Silva
    • 2
  • Américo Moraes-Neto
    • 2
  • Mara Cristina Almeida
    • 2
  • Marcelo Ricardo Vicari
    • 2
  • Orlando Moreira-Filho
    • 3
  • Roberto Ferreira Artoni
    • 2
  1. 1.Laboratório de Ecofisiologia e Evolução MolecularInstituto Nacional de Pesquisas da AmazôniaManausBrazil
  2. 2.Departamento de Biologia Estrutural, Molecular e GenéticaUniversidade Estadual de Ponta GrossaPonta GrossaBrazil
  3. 3.Departamento de Genética e EvoluçãoUniversidade Federal de São CarlosSão CarlosBrazil

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