Sex chromosome system ZZ/ZW in Apareiodon hasemani Eigenmann, 1916 (Characiformes, Parodontidae) and a derived chromosomal region

Genetics and Molecular Biology

Elisangela Bellafronte²  Michelle Orane Schemberger¹  Roberto Ferreira Artoni¹  Orlando Moreira Filho²  Marcelo Ricardo Vicari¹ 

[1],Universidade Federal de São Carlos Departamento de Genética e Evolução São Carlos SP ,Brazil

关键词: cytogenetics;    FISH;    18S rDNA;    5S rDNA;    Neotropical fishes;   

DOI  :  10.1590/S1415-47572012005000077

来源: SciELO

【 摘 要 】

Parodontidae fish show few morphological characteristics for the identification of their representatives and chromosomal analyses have provided reliable features for determining the interrelationships in this family. In this study, the chromosomes of Apareiodon hasemani from the São Francisco River basin, Brazil, were analyzed and showed a karyotype with 2n = 54 meta/submetacentric chromosomes, and a ZZ/ZW sex chromosome system. The study revealed active NORs located on pair 11 and additional 18S rDNA sites on pairs 7 and 22. The 5S rDNA locus was found in pair 14. It showed a pericentric inversion regarding the ancestral condition. The satellite DNA pPh2004 was absent in the chromosomes of A. hasemani, a shared condition with most members of Apareiodon. The WAp probe was able to detect the amplification region of the W chromosome, corroborating the common origin of the system within Parodontidae. These chromosomal data corroborate an origin for the ZW system of Parodontidae and aid in the understanding of the differentiation of sex chromosome systems in Neotropical fishes.

【 授权许可】

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