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Genetics and Molecular Biology

Print version ISSN 1415-4757

Abstract

MOREIRA, Camila Nascimento et al. A remarkable autosomal heteromorphism in Pseudoryzomys simplex 2n = 56; FN = 54-55 (Rodentia, Sigmodontinae). Genet. Mol. Biol. [online]. 2013, vol.36, n.2, pp.201-206. ISSN 1415-4757.  https://doi.org/10.1590/S1415-47572013000200010.

Pseudoryzomys simplex, the false rice rat, is a monotypic genus of the Oryzomyini tribe (Sigmodontinae) distributed in part of Bolivia, Paraguay, Argentina and Brazil. Its diploid number has been described as 56 acrocentric chromosomes decreasing in size and no karyotype figure has been depicted. Herein, we present karyotypic data on P. simplex, including chromosome banding and molecular fluorescent in situ hybridization using telomeric sequences and the whole X-chromosome of its sister clade Holochilus brasiliensis (HBR) as probes. A case of remarkable autosomal heteromorphism due to the presence of a whole heterochromatic arm leading to the variability of FN is reported, as well as the occurrence of regions of homology between the X and Y chromosomes (pseudoautosomal regions) after chromosome painting with the HBR X probe on P. simplex metaphases.

Keywords : cytogenetics; fluorescent in situ hybridization; heterochromatin; Oryzomyini.

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