First report of a B chromosome in a natural population of Astyanax altiparanae (Characiformes, Characidae)
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Data
2008-01-01
Autores
Hashimoto, Diogo Teruo [UNESP]
Gonçalves, Vanessa Regina [UNESP]
Bortolozzi, Jehud [UNESP]
Foresti, Fausto [UNESP]
Porto-Foresti, Fábio [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Sociedade Brasileira de Genética
Resumo
Several species of the genus Astyanax have already been genetically studied, and B-chromosomes have been considered to be an interesting feature in some species of this group. In the present paper we report, for the first time, the occurrence of a B microchromosome in a natural population of A. altiparanae. This additional genomic element was identified as an acrocentric chromosome, similar in size to the smallest chromosomal pairs of the standard karyotype. Analysis of the constitutive heterochromatin pattern by C-banding evidenced heterochromatic blocks located on centromeric, pericentromeric, and interstitial regions of some chromosomes, and also positive marks in a subtelocentric chromosomal pair that presented the short arms entirely heterochromatic. The application of this methodology also revealed a heterochromatic pattern in the extra chromosome, a typical feature of supernumerary chromosomes.
Descrição
Palavras-chave
B chromosomes, fish cytogenetics, Astyanax altiparanae
Como citar
Genetics and Molecular Biology. Sociedade Brasileira de Genética, v. 31, n. 1, p. 275-278, 2008.