Comparative cytogenetics of Carnegiella marthae and Carnegiella strigata (Characiformes, Gasteropelecidae) and description of a ZZ/ZW sex chromosome system

Comparative cytogenetic analyses of hatchetfishes Carnegiella marthae and Carnegiella strigata (Gasteropelecidae) from the Rio Negro basin were performed using conventional Giemsa staining, silver (Ag) -staining and C- banding. The diploid chromosome numbers of both species equaled 2n = 50 but their...

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Published in:Genetics and molecular biology 2008, Vol.31 (1 suppl), p.231-234
Main Authors: Terencio, Maria Leandra, Schneider, Carlos Henrique, Gross, Maria Claudia, Silva, Adailton Moreira da, Feldberg, Eliana, Porto, Jorge Ivan Rebelo
Format: Article
Language:English
Subjects:
BIOCHEMISTRY & MOLECULAR BIOLOGY
Carnegiella marthae
Carnegiella strigata
Characiformes
cytotaxonomy
fish cytogenetics
Gasteropelecidae
GENETICS & HEREDITY
heteromorphic sex chromosome system
karyotype differentiation
NOR phenotypes
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Summary:Comparative cytogenetic analyses of hatchetfishes Carnegiella marthae and Carnegiella strigata (Gasteropelecidae) from the Rio Negro basin were performed using conventional Giemsa staining, silver (Ag) -staining and C- banding. The diploid chromosome numbers of both species equaled 2n = 50 but their karyotypes were distinct. We found evidence for sex chromosomes in C. marthae since karyotype of males presented 20 M + 12 SM + 4 ST + 14 A and ZZ ST chromosomes while the females presented 20 M + 12 SM + 4 ST + 14 A and ZW ST chromosomes of distinct size. Conversely, C. strigata presented 4 M + 4 SM + 2 ST + 40 A chromosomes without sex chromosome heteromorphism. Karyotypes of both species had two NOR-bearing SM chromosomes of distinct size indicating the presence of multiple NOR phenotypes. The sex chromosome pair had specific C-banding pattern allowing identification of both Z and W. This heteromorphic system has previously been described for the gasteropelecids.
ISSN:1415-4757
1678-4685
1415-4757
1678-4685
DOI:10.1590/S1415-47572008000200011