Nuclear DNA content determination in Characiformes fish (Teleostei, Ostariophysi) from the Neotropical region

Genetics and Molecular Biology

Margarida Lima Carvalho²  Claudio Oliveira¹  Maria Clara Navarrete¹  Otávio Froehlich¹  Fausto Foresti¹ 

[1] ,Universidade Federal do Acre Departamento de Ciências da Natureza Rio Branco Acre ,Brazil

关键词: nuclear DNA;    DNA content;    chromosome;    fish;    evolution;   

DOI  :  10.1590/S1415-47572002000100010

来源: SciELO

【 摘 要 】

In the present study, nuclear DNA content was analyzed in 53 species of Characiformes fish from the Neotropical region. Diploid number ranged from 2n = 48 in Astyanax fasciatus, Gymnocorymbus ternetzi and Hyphessobrycon griemi to 2n = 102 in Potamorhina squamoralevis, with a modal number of 54 chromosomes. Nuclear DNA content ranged from 1.70 ± 0.04 pg of DNA per diploid nucleus in Acestrorhynchus pantaneiro to 3.94 ± 0.09 pg in Tetragonopterus chalceus. A general analysis showed a mean value of 2.9 pg of DNA per diploid nucleus. Very similar DNA content values were observed in the species of the family Cynodontidae which showed a variation of 3% between the two genera studied. Small variations were observed between populations of Gymnocorymbus ternetzi, Astyanax fasciatus and Moenkhausia sanctaefilomenae (Characidae, Tetragonopterinae). The subfamilies Tetragonopterinae and Acestrorhynchinae (Characidae) presented the widest range, about 96%. Even in those families in which diploid number and karyotypic formulae were conserved such as the families Anostomidae, Curimatidae, and Prochilodontidae, episodes leading to losses or gains of genetic material became fixed in their evolutionary history.

【 授权许可】

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