1. Cytogenetic analysis in three Bryconamericus species (Characiformes, Characidae): first description of the 5S rDNA-bearing chromosome pairs in the genus
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Diovani Piscor, Daniela Bocagini Ribacinko-Piscor, Carlos Alexandre Fernandes, Patricia Pasquali Parise-Maltempi, Universidade Estadual Paulista (Unesp), and Universidade Estadual de Mato Grosso do Sul (UEMS)
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medicine.medical_specialty ,Secondary constriction ,Bryconamericus ,Characiformes ,Biochemistry ,Chromosomes ,FISH ,Heterochromatin ,medicine ,Genetics ,Genetics(clinical) ,Ribosomal DNA ,Molecular Biology ,Genetics (clinical) ,Biochemistry, medical ,biology ,Research ,Biochemistry (medical) ,Cytogenetics ,Chromosome ,Karyotype ,biology.organism_classification ,NOR ,Characidae ,rDNA probe ,Molecular Medicine - Abstract
Made available in DSpace on 2014-12-03T13:11:00Z (GMT). No. of bitstreams: 0 Previous issue date: 2013-04-01Bitstream added on 2014-12-03T13:22:50Z : No. of bitstreams: 1 WOS000317829800001.pdf: 597255 bytes, checksum: d596e504ddd65c823178cb74e22b9092 (MD5) Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Background: Nowadays, the genus Bryconamericus is placed in subfamily Stevardiinae within of Characidae, but not shows consistent evidence of monophyletism. The purpose of this work was to study the chromosomes of three species of Bryconamericus, aiming to add cytogenetic knowledge and contribute to the understanding of the chromosomal evolution of this genus.Results: The chromosomes of three species of Bryconamericus were analyzed using cytogenetic techniques. The karyotype of Bryconamericus stramineus contained 6 metacentric (m) + 10 submetacentric (sm) + 16 subtelocentric (st) + 20 acrocentric (a), the fundamental number (FN) of 84, one silver impregnated (Ag-NOR) pair, one pair bearing the 18S ribosomal DNA sites, another pair bearing the 5S rDNA sites, and a few positive C-bands. Bryconamericus turiuba had a karyotype containing 8 m + 10sm + 14st + 20a (FN = 84), one chromosome pair Ag-NOR, two pairs bearing the 18S rDNA sites, two pairs bearing the 5S rDNA sites, and a few C-band regions. Bryconamericus cf. iheringii had a karyotype containing 10 m + 14sm + 18st + 10a (FN = 94), including one pair with a secondary constriction Ag-NOR positive. In this karyotype the fluorescent in situ hybridization (FISH) showed the 18S and 5S rDNA probe in adjacent position.Conclusions: The results obtained in this work showed different characteristics in the organization of two multigene families, indicating that distinct evolutionary forces acting on the diversity of rDNA sequences in the genome of three Bryconamericus species. Univ Estadual Paulista Julio Mesquita Filho UNESP, Inst Biociencias, Dept Biol, Lab Citogenet, BR-13506900 Rio Claro, SP, Brazil Univ Estadual Mato Grosso Sul UEMS, BR-79980000 Mundo Novo, MS, Brazil Univ Estadual Paulista Julio Mesquita Filho UNESP, Inst Biociencias, Dept Biol, Lab Citogenet, BR-13506900 Rio Claro, SP, Brazil
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