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Evolutionary Relationships among Boulengerella Species (Ctenoluciidae, Characiformes): Genomic Organization of Repetitive DNAs and Highly Conserved Karyotypes.
de Souza E Sousa, José F; Viana, Patrik F; Bertollo, Luiz A C; Cioffi, Marcelo B; Feldberg, Eliana.
Affiliation
  • de Souza E Sousa JF; Laboratório de Genética Animal, Coordenação de Biodiversidade, Instituto Nacional de Pesquisas da Amazônia, Manaus, Brazil.
Cytogenet Genome Res ; 152(4): 194-203, 2017.
Article in En | MEDLINE | ID: mdl-28942442
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.
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Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Characiformes Limits: Animals Country/Region as subject: America do sul / Brasil Language: En Journal: Cytogenet Genome Res Journal subject: GENETICA Year: 2017 Document type: Article Affiliation country: Brazil Country of publication: Switzerland

Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Characiformes Limits: Animals Country/Region as subject: America do sul / Brasil Language: En Journal: Cytogenet Genome Res Journal subject: GENETICA Year: 2017 Document type: Article Affiliation country: Brazil Country of publication: Switzerland