Chromosomal diversity in Hypostomus (Siluriformes, Loricariidae) with emphasis on physical mapping of 18S and 5S rDNA sites

Autor(es)

Traldi, J. B. ^[1] ; Blanco, D. R. ^[1] ; Vicari, M. R. ^[2] ; Martinez, J. F. ^[1] ; Lui, R. L. ^[1] ; Barros, A. V. ^[2] ; Artoni, R. F. ^[2] ; Moreira-Filho, O. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, Dept Genet & Evolucao, BR-13560 Sao Carlos, SP - Brazil

^[2] Univ Estadual Ponta Grossa, Dept Biol Estrutural Mol & Genet, Ponta Grossa, PR - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Genetics and Molecular Research; v. 12, n. 1, p. 463-471, 2013.
• Citações Web of Science: 16

Resumo

We examined chromosomes of three species of the genus Hypostomus, in order to contribute to the understanding of the karyotype evolution of this group. Specimens of H. ancistroides and H. nigromaculatus displayed differences in karyotype formulas, distribution and location of heterochromatin and nucleolus organizer regions when compared to other populations of the same species. We made the first cytogenetic characterization of H. tapijara, an endemic species in the Ribeira de Iguape River. These specimens had 2n = 66 chromosomes, while H. ancistroides showed 2n = 68 and H. nigromaculatus 2n = 76 chromosomes. Physical mapping of 18S and 5S rDNA sites of the three species showed simple, multiple and syntenic clusters. Synteny of ribosomal sites was found in H. ancistroides and H. tapijara, and an interspersed pattern between these sites in all chromosomes bearing the synteny was observed. We conclude that the genus Hypostomus has a high chromosome complexity that is accompanied by great morphological variation. It is evident that this group comprises an interesting model for understanding the chromosome evolution of Neotropical ichthyofauna. (AU)

• Processo FAPESP: 10/12789-0 - Citogenética comparativa em espécies de Hypostomus (Siluriformes, Loricariidae, Hypostominae): contribuição da fração repetitiva do genoma para a diversidade cromossômica do grupo
• Beneficiário: Josiane Baccarin Traldi
• Modalidade de apoio: Bolsas no Brasil - Mestrado