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

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 chromosom...

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Veröffentlicht in:	Reviews in fish biology and fisheries 2011-09, Vol.21 (3), p.497-508
Hauptverfasser:	Matoso, Daniele Aparecida, de Almeida Val, Vera Maria Fonseca, da Silva, Maelin, Moraes-Neto, Américo, Almeida, Mara Cristina, Vicari, Marcelo Ricardo, Moreira-Filho, Orlando, Artoni, Roberto Ferreira
Format:	Artikel
Sprache:	eng
Schlagworte:	Analysis Chromosomes Cloning Creeks & streams E coli Evolutionary biology Females Fish Fisheries Karyotypes Males Pimelodidae Polymorphism Sex chromosomes Sexes Siluriformes Steindachneridion Studies Y chromosomes
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Zusammenfassung:	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.[PUBLICATION ABSTRACT]
ISSN:	0960-3166 1573-5184
DOI:	10.1007/s11160-011-9201-2