Autor(es):
Terêncio, Maria Leandra ; Schneider, Carlos Henrique ; Gross, Maria Claudia ; Silva, Adailton Moreira da ; Feldberg, Eliana ; Porto, Jorge Ivan Rebelo
Data: 2020
Origem: Oasisbr
Assunto(s): Animals Cell; Brasil; C Banding; Carnegiella Marthae; Carnegiella Strigata; Chromosome Analysis; Chromosome Banding Pattern; Chromosome Nor; Chromosome Size; Comparative Study; Controlled Study; Cytogenetics; Cytotaxonomy; Diploidy; Female; Fish; Fish Genetics; Giemsa Stain; Karyotype; Male; Nonhuman; Phenotype; Sex Chromosome; Silver Staining; Species Comparison; Carnegiella Marthae; Carnegiella Strigata; Characiformes; Gasteropelecidae
Descrição
Comparative cytogenetic analyses of hatchetfishes Camegiella marthae and Camegiella 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. Copyright © 2008, Sociedade Brasileira de Genética.
