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Título: | Evolutionary Relationships among Boulengerella Species (Ctenoluciidae, Characiformes): Genomic Organization of Repetitive DNAs and Highly Conserved Karyotypes |
Autor: | Souza E Sousa, José F. de Viana, Patrik Ferreira Bertollo, Luiz Antônio Carlos Cioffi, Marcelo de Bello Feldberg, Eliana |
Palavras-chave: | Dna 18s Repetitive Dna Rna 5s Ribosome Dna Rna 18s Rna 5s Animals Experiment Bioaccumulation Boulengerella Cuvieri Boulengerella Lateristriga Boulengerella Lucius Boulengerella Maculata Characiformes Chromosome 18 Chromosome Analysis Chromosome Nor Chromosome Painting Conserved Sequence Controlled Study Ctenolucius Beani Ctenolucius Hujeta Cytogenetics Female Genome Analysis Heterochromatin Karyotype Karyotype 46,xx Karyotype 46,xy Male Evolution, Molecular Nonhuman Priority Journal Sequence Analysis Sex Chromosome Species Difference Animals Characiformes Chromosome Banding Pattern Classification In Situ Hybridization, Fluorescence Genetics Genome Karyotyping Evolution, Molecular Nucleotide Repeat X Chromosome Y Chromosome Animal Characiformes Chromosome Banding Conserved Sequence Ribosomal Dna Evolution, Molecular Female Genome In Situ Hybridization, Fluorescence Karyotyping Male Repetitive Sequences, Nucleic Acid Rna, Ribosomal, 18s Rna, Ribosomal, 5s X Chromosome Y Chromosome |
Data do documento: | 2017 |
Revista: | Cytogenetic and Genome Research |
É parte de: | Volume 152, Número 4, Pags. 194-203 |
Abstract: | Ctenoluciidae is a Neotropical freshwater fish family whose representatives are known as bicudas. The genus Boulengerella contains 5 species, and 4 of them (B. cuvieri, B. lateristriga, B. lucius, and B. maculata) were cytogenetically analyzed in the present study by conventional and molecular procedures. All 4 species have a very similar karyotype, with 2n = 36 chromosomes (14 metacentrics + 16 submetacentrics + 6 subtelocentrics; FN = 72). However, the heterochromatin distribution pattern is species-specific. In all 4 species, the nucleolus organizer region is located in pair 18, as also confirmed by cytogenetic mapping of 18S rDNA. In turn, 5S rRNA genes are present in 2 chromosome pairs: in pair 1 of all 4 species, and in pair 10 of B. lateristriga, B. maculata, and B. cuvieri, but in pair 4 of B. lucius. The telomeric probe highlighted terminal regions in all chromosomes, as well as an interstitial centromeric sequence in pair 3 of the 3 first-mentioned species. Notably, a conspicuous heteromorphic secondary constriction in chromosomes 18 was found only in the males of the 3 species, rendering one of the homologs much larger than the other one. This feature, associated with a large 18S rDNA block and accumulation of telomeric sequences, suggests the presence of an XX/XY sex chromosome system in the analyzed Boulengerella species. © 2017 S. Karger AG, Basel. |
DOI: | 10.1159/000480141 |
Aparece nas coleções: | Artigos |
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