Animal Cytogenetics and Comparative Mapping
نویسنده
چکیده
ABC Fax + 41 61 306 12 34 E-mail [email protected] www.karger.com © 2003 S. Karger AG, Basel 0301–0171/03/1032–0128$19.50/0 Accessible online at: www.karger.com/cgr Abstract. The karyotypes of three species of sphaerodactyl gekkonid lizards are described after conventional and differential staining. Karyotypes of Gonatodes humeralis and G. hasemani are formed by a gradual series of 32 acrocentric chromosomes, similar to those already published for other species of the genus. G. humeralis shows multiple Ag-NORs with intra-individual variability, and positive C-bands located at centromeric and telomeric regions of several chromosome pairs. Coleodactylus amazonicus, the first non-Gonatodes sphaerodactyl studied so far karyologically, exhibits 36 acrocentric/subtelocentric chromosomes and a single pair of AgNORs. Fragile sites were detected on two medium-sized chromosome pairs in the karyotype of G. humeralis, most of them obtained in BrdU-treated culture preparations. These sites may represent a putative fission/fusion spot involved in the differentiation of G. humeralis-like 2n = 32 and C. amazonicus-like 2n = 36 karyotypes. Our results, especially on the location of Ag-NORs and the description of fragile sites, are relevant in improving our knowledge about the events of chromosome evolution in this extremely variable and poorly known group of lizards.
منابع مشابه
Animal Cytogenetics and Comparative Mapping
Supported by grants to T.J.R. from the South African National Research Foundation (NRF; GUN 2053812) and the Wellcome Trust (to T.J.R. and M.A.F.-S.). The work was conducted while V.T. was a postdoctoral fellow at the University of Stellenbosch. His support from the NRF, the University of Stellenbosch and the Russian Fund of Basic Research and Grant 01-2163 from the International Association fo...
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