Use este identificador para citar ou linkar para este item: https://repositorio.inpa.gov.br/handle/1/18001
Título: Molecular cytogenetic characterization of the Amazon River dolphin Inia geoffrensis
Autor: Bonifácio, Heidi L.
Silva, Vera Maria Ferreira da
Martin, Anthony Richard
Feldberg, Eliana
Palavras-chave: Ribosome Dna
Animals
Chromosome Nor
Cytogenetics
Dolphin
Euchromatin
Genetics
Karyotyping
Metabolism
River
Animal
Cytogenetics
Ribosomal Dna
Dolphins
Euchromatin
Karyotyping
Nucleolus Organizer Region
Rivers
Cetacea
Inia Geoffrensis
Data do documento: 2012
Revista: Genetica
Encontra-se em: Volume 140, Número 7-9, Pags. 307-315
Abstract: Classical and molecular cytogenetic (18S rDNA, telomeric sequence, and LINE-1 retrotransposon probes) studies were carried out to contribute to an understanding of the organization of repeated DNA elements in the Amazon River dolphin (boto, Inia geoffrensis). Twenty-seven specimens were examined, each presenting 2n = 44 chromosomes, the karyotype formula 12m + 14sm + 6st + 10t + XX/XY, and fundamental number (FN) = 74. C-positive heterochromatin was observed in terminal and interstitial positions, with the occurrence of polymorphism. Interstitial telomeric sequences were not observed. The nucleolar organizer region (NOR) was located at a single site on a smallest autosomal pair. LINE-1 was preferentially distributed in the euchromatin regions, with the greatest accumulation on the X chromosome. Although the karyotype structure in cetaceans is considered to be conserved, the boto karyotype demonstrated significant variations in its formula, heterochromatin distribution, and the location of the NOR compared to other cetacean species. These results contribute to knowledge of the chromosome organization in boto and to a better understanding of karyoevolution in cetaceans. © 2012 Springer Science+Business Media B.V.
DOI: 10.1007/s10709-012-9680-7
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