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(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Physical mapping of the 18S and 5S ribosomal genes in nine Characidae species (Teleostei, Characiformes)

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Author(s):
Wellington Adriano Moreira Peres [1] ; Luiz Antonio Carlos Bertollo [2] ; Orlando Moreira Filho [3]
Total Authors: 3
Affiliation:
[1] Universidade Federal de São Carlos. Departamento de Genética e Evolução - Brasil
[2] Universidade Federal de São Carlos. Departamento de Genética e Evolução - Brasil
[3] Universidade Federal de São Carlos. Departamento de Genética e Evolução - Brasil
Total Affiliations: 3
Document type: Journal article
Source: GENETICS AND MOLECULAR BIOLOGY; v. 31, n. 1, p. 222-226, 2008-00-00.
Abstract

Characidae is one of the largest fish families of the Neotropical region, and presenting a pronounced morphological variability, certainly does not constitute a monophyletic group. The cytogenetical data also show a large chromosomal variation and can provide important information for a better understanding of the relationships between the species of this group. 18S and 5S rDNA probes were used in the present study for the chromosomal mapping in different Characidae species from the São Francisco River (Astyanax lacustris, Astyanax scabripinnis, Hasemania nana, Piabina argentea, Orthospinus franciscensis, Serrapinnus heterodon, Serrapinnus piaba and Myleus micans) and Alto Paraná (Astyanax altiparanae) basins. Species with a single pair of chromosomes bearing the nucleolar organizing regions (NORs) were identified, as well as species with multiple NORs, up to a maximum of seven 18S rDNA sites. The number of 5S rDNA site was also not constant, varying from two to eight. The mapping of the ribosomal genes was useful for the characterization and differentiation of the analyzed species. (AU)