Chromosomal polymorphism in Steindachneridion melanodermatum 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


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.


Evolutionary biology Karyotype evolution Sex differentiation Retrotransposon 



The authors are grateful to Miguel Airton Carvalho by field assistance. This study received financial support from the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) and Fundação Araucária de Apoio ao Desenvolvimento Científico e Tecnológico do Estado do Paraná. D.A.M. was the recipient of a PhD fellowship from the CNPq (142313/2005-0).


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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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