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Artigo Produção Nacional Revisado por pares
BIBTEX RIS

Chromosomal Evolution in the Brazilian Geckos of the Genus <i>Gymnodactylus</i> (Squamata, Phyllodactylidae) from the Biomes of Cerrado, Caatinga and Atlantic Rain Forest: Evidence of Robertsonian Fusion Events and Supernumerary Chromosomes

2009; Karger Publishers; Volume: 127; Issue: 2-4 Linguagem: Inglês

10.1159/000295175

ISSN

1424-8581

Autores

Kátia C. M. Pellegrino, R.M.L. dos Santos, Miguel Tréfaut Rodrigues, M.M. Laguna, Renata Cecília Amaro, Yatiyo Yonenaga-Yassuda,

Tópico(s)

Plant Virus Research Studies

Resumo

Chromosomes of the South American geckos <i>Gymnodactylus amarali</i> and <i>G. geckoides</i> from open and dry areas of the Cerrado and Caatinga biomes in Brazil, respectively, were studied for the first time, after conventional and AgNOR staining, CBG- and RBG-banding, and FISH with telomeric sequences. Comparative analyses between the karyotypes of open areas and the previously studied Atlantic forest species <i>G. darwinii</i> were also performed. The chromosomal polymorphisms detected in populations of <i>G. amarali</i> from the states of Goiás and Tocantins is the result of centric fusions (2n = 38, 39 and 40), suggesting a differentiation from a 2n = 40 ancestral karyotype and the presence of supernumerary chromosomes. The CBG- and RBG-banding patterns of the Bs are described. <i>G. geckoides</i> has 40 chromosomes with gradually decreasing sizes, but it is distinct from the 2n = 40 karyotypes of <i>G. amarali</i> and <i>G. darwinii</i> due to occurrence of pericentric inversions or centromere repositioning. NOR location seems to be a marker for <i>Gymnodactylus</i>, as <i>G. amarali</i> and <i>G. geckoides </i>share a medium-sized subtelocentric NOR-bearing pair, while <i>G. darwinii</i> has NORs at the secondary constriction of the long arm of pair 1. The comparative analyses indicate a non-random nature of the Robertsonian rearrangements in the genus <i>Gymnodactylus.</i>

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