Comparative cytogenetics of Carnegiella marthae and Carnegiella strigata (Characiformes, Gasteropelecidae) and description of a ZZ/ZW sex chromosome system
Genet. mol. biol
;
31(1,suppl): 231-234, 2008. ilus
Artículo
en Inglés
| LILACS
| ID: lil-484591
ABSTRACT
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.
Texto completo:
Disponible
Índice:
LILACS (Américas)
Asunto principal:
Análisis Citogenético
/
Peces
/
Región Organizadora del Nucléolo
Límite:
Animales
Idioma:
Inglés
Revista:
Genet. mol. biol
Asunto de la revista:
Genética
Año:
2008
Tipo del documento:
Artículo
País de afiliación:
Brasil
Institución/País de afiliación:
Instituto Nacional de Pesquisas da Amazônia/BR
/
Universidade Estadual do Amazonas/BR
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