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

dc.contributorUniversidade Estadual Paulista (UNESP)
dc.creatorGarcia, C.
dc.creatorOliveira, C.
dc.creatorAlmeida-Toledo, L. F.
dc.date2014-05-20T13:52:32Z
dc.date2014-05-20T13:52:32Z
dc.date2010-01-01
dc.date.accessioned2017-04-05T21:07:04Z
dc.date.available2017-04-05T21:07:04Z
dc.identifierGenetics and Molecular Research. Ribeirao Preto: Funpec-editora, v. 9, n. 1, p. 365-384, 2010.
dc.identifier1676-5680
dc.identifierhttp://hdl.handle.net/11449/18755
dc.identifier10.4238/vol9-1gmr750
dc.identifierWOS:000277326200032
dc.identifierWOS000277326200032.pdf
dc.identifierhttp://dx.doi.org/10.4238/vol9-1gmr750
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/864821
dc.descriptionAmong 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.
dc.descriptionCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.languageeng
dc.publisherFunpec-editora
dc.relationGenetics and Molecular Research
dc.rightsinfo:eu-repo/semantics/openAccess
dc.subjectKaryotype
dc.subjectSupernumerary chromosomes
dc.subjectRhamdia
dc.subjectHeterochromatin
dc.subjectNon-disjunction
dc.titleKaryotypic evolution trends in Rhamdia quelen (Siluriformes, Heptapteridae) with considerations about the origin and differentiation of its supernumerary chromosomes
dc.typeOtro


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