skip to main content
Idioma:

Karyotypic evolution trends in Rhamdia quelen (Siluriformes, Heptapteridae) with considerations about the origin and differentiation of its supernumerary chromosomes

Garcia, C ; Oliveira, C ; Almeida-Toledo, L.F

Genetics and molecular research, 2010-01, Vol.9 (1), p.365-384 [Periódico revisado por pares]

Brazil

Texto completo disponível

Citações Citado por
  • Título:
    Karyotypic evolution trends in Rhamdia quelen (Siluriformes, Heptapteridae) with considerations about the origin and differentiation of its supernumerary chromosomes
  • Autor: Garcia, C ; Oliveira, C ; Almeida-Toledo, L.F
  • Assuntos: Animals ; Azure Stains ; catfish ; Catfishes - genetics ; Chromosome Banding ; chromosome number ; chromosome segregation ; Chromosomes - genetics ; cytogenetic analysis ; evolution ; Evolution, Molecular ; freshwater fish ; heterochromatin ; Karyotyping ; Metaphase ; Rhamdia ; Rhamdia quelen ; Siluriformes ; supernumerary chromosomes
  • É parte de: Genetics and molecular research, 2010-01, Vol.9 (1), p.365-384
  • Notas: http://dx.doi.org/10.4238/vol9-1gmr750
    ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Descrição: Among catfish species of the genus Rhamdia reported for the Brazilian territory, R. quelen is the most widespread, being found in nearly all hydrographic basins of Brazil. Nowadays, R. quelen is a synonym for at least 47 other species in this genus, its taxonomic status still being controversial. The available cytogenetic reports show a wide variation in the karyotypic macrostructure, with the frequent presence of supernumerary chromosomes. The remarkable cytogenetic variability associated with taxonomic issues in this species indicates that R. quelen is actually a species complex. In order to carry out a wide comparative cytogenetic study in R. quelen from southern and southeastern Brazil and examine a species complex, we analyzed the chromosomes of 14 populations from the main hydrographic basins of these two regions. Using classic and molecular cytogenetic techniques, we found seven distinct karyotypic formulae, all bearing 2n = 58 chromosomes. Supernumerary chromosomes were present in most of the populations; their number, size and C-banding pattern allowed us to differentiate populations with similar karyotypic compositions. We examined patterns of chromosomal evolution as well as the probable mechanisms involved in the origin and morphological differentiation of their supernumerary chromosomes.
  • Editor: Brazil
  • Idioma: Inglês
Links
Voltar para lista de resultados
Resultado  1

  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

Buscando em bases de dados remotas. Favor aguardar.