(T2AG3)n Telomeric Sequence Hybridization Indicating Centric Fusion Rearrangements in the Karyotype of the Rodent Oryzomys Subflavus |
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Authors: | Jaqueline Andrades-Miranda Nilson I.T. Zanchin Luiz F.B. Oliveira Alfredo R. Langguth Margarete S. Mattevi |
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Affiliation: | (1) Departamento de Genética, Universidade Federal do Rio Grande do Sul, C.P. 15053, 91501-970 Porto Alegre, Rio Grande do Sul, Brazil;(2) Museu Nacional, Setor de Mastozoologia, Universidade Federal do Rio de Janeiro, 20940-040 Rio de Janeiro, Brazil;(3) Departamento de Sistemática e Ecologia, Universidade Federal da Paraíba, João Pessoa, Paraíba, Brazil |
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Abstract: | Chromosome preparations of 30 specimens of Oryzomys subflavus trapped in eight Brazilian localities were C-, and G-banded and analyzed by fluorescence in situ hybridization (FISH). Two karyotypes were found, 2n=50/FN=64, at three coastal localities of the Atlantic Forest domain, and 2n=58/FN=70 at two sites located in the Cerrado biome, Brazil Central. Two fluorescence in situ hybridization (FISH) patterns of the telomeric sequence (T2AG3)n were observed: in both karyotypes the probes hybridized to the telomeres of all chromosomes and also a hybridization signal in the centromeric regions of two autosome pairs was seen in the 2n=50 karyotype. These results, together with the occurrence of other diploid numbers described in the literature, suggest that O. subflavus is a complex species, bearing fusion/fission rearrangements proper to the different biomes which it inhabits. |
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Keywords: | FISH fusion/fission karyotypes Oryzomys subflavus Sigmodontinae |
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