Evidence of chromosome fusion in Gymnotus sylvius Albert & Fernandes-Matoli, 1999 (Teleostei: Gymnotiformes) detected by telomeric probes and R-banding
Contribuinte(s) |
UNIVERSIDADE DE SÃO PAULO |
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Data(s) |
20/10/2012
20/10/2012
2010
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Resumo |
Gymnotus cf. carapo and Gynznotus sylvius are two fish species inhabiting the Upper Parana River Basin, presenting respectively 2n =54 and 2n = 40 chromosomes. In the present cytogenetic analysis, R-banding and telomere-sequence hybridization were carried out in order to determine the possible relationship between the karyotipes of these two species. Incorporation bands (R-bands) obtained for the two species allowed the identification of chromosome similarities, showing to be an usefull alternative to the G-banding methods, which fail in producing satisfying results in most of analyzed fish species. This approach, associated with the hybridization of telomeric sequences, permited to identify chromosomal rearrangements that could be used as indicators of karyotypic evolution within the group. In the present case, telomeric sequences were detected in the centromeric region of two metacentric chromosome pairs of Gymnotus sylvius. The results obtained after hybridization with the telomere sequences, coupled with the chromosome homeologies detected by R-banding, showed that G. cf carapo and G. sylvius should present a common ancestor, and this may also be corroborated by the similarities found in three chromosome pairs, that seem to have been conserved during the evolution of the two species. Based on the data here presented we propose that G. sylvius may have undergone a recent process of chromosome fusion that resulted in the diminution of its chromosome number. FAPESP Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) CAPES Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) CNPq Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) |
Identificador |
CARYOLOGIA, v.63, n.2, p.134-141, 2010 0008-7114 |
Idioma(s) |
eng |
Publicador |
UNIV FLORENCE BOTANY INST |
Relação |
Caryologia |
Direitos |
restrictedAccess Copyright UNIV FLORENCE BOTANY INST |
Palavras-Chave | #Fusion, Gymnotiformes #ITS #R-banding #telomere #EVOLUTION #FISH #REPLICATION #CARAPO #PISCES #Genetics & Heredity |
Tipo |
article original article publishedVersion |