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

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dc.contributor.authorGarcia, C.
dc.contributor.authorOliveira, C. [UNESP]
dc.contributor.authorAlmeida-Toledo, L. F.
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-20T13:52:32Z
dc.date.available2014-05-20T13:52:32Z
dc.date.issued2010-01-01
dc.description.abstractAmong 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.en
dc.description.affiliationUniv São Paulo, Dept Genet & Biol Evolut, São Paulo, Brazil
dc.description.affiliationUniv Estadual Paulista Julio de Mesquista Filho, Dept Morfol, Botucatu, SP, Brazil
dc.description.affiliationUnespUniv Estadual Paulista Julio de Mesquista Filho, Dept Morfol, Botucatu, SP, Brazil
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.format.extent365-384
dc.identifierhttp://dx.doi.org/10.4238/vol9-1gmr750
dc.identifier.citationGenetics and Molecular Research. Ribeirao Preto: Funpec-editora, v. 9, n. 1, p. 365-384, 2010.
dc.identifier.doi10.4238/vol9-1gmr750
dc.identifier.fileWOS000277326200032.pdf
dc.identifier.issn1676-5680
dc.identifier.urihttp://hdl.handle.net/11449/18755
dc.identifier.wosWOS:000277326200032
dc.language.isoeng
dc.publisherFunpec-editora
dc.relation.ispartofGenetics and Molecular Research
dc.relation.ispartofsjr0,439
dc.rights.accessRightsAcesso aberto
dc.sourceWeb of Science
dc.subjectKaryotypeen
dc.subjectSupernumerary chromosomesen
dc.subjectRhamdiaen
dc.subjectHeterochromatinen
dc.subjectNon-disjunctionen
dc.titleKaryotypic evolution trends in Rhamdia quelen (Siluriformes, Heptapteridae) with considerations about the origin and differentiation of its supernumerary chromosomesen
dc.typeArtigo
dcterms.licensehttp://www.geneticsmr.com/node/2
dcterms.rightsHolderFunpec-editora
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Biociências, Botucatupt

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Artigos - Morfologia - IBB