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Karyological geographic variation of Oligoryzomys nigripes Olfers, 1818 (Rodentia, Cricetidae) from Brazil
Paresque, Roberta; Silva, Maria José de Jesus; Yonenaga-Yassuda, Yatiyo; Fagundes, Valéria.
  • Paresque, Roberta; Universidade Federal do Espírito Santo. Centro de Ciências Humanas e Naturais. Departamento de Ciências Biológicas. Laboratório de Genética Animal. Vitória. BR
  • Silva, Maria José de Jesus; Universidade de São Paulo. Instituto de Biociências. Departamento de Genética e Biologia Evolutiva. São Paulo. BR
  • Yonenaga-Yassuda, Yatiyo; Universidade de São Paulo. Instituto de Biociências. Departamento de Genética e Biologia Evolutiva. São Paulo. BR
  • Fagundes, Valéria; Universidade Federal do Espírito Santo. Centro de Ciências Humanas e Naturais. Departamento de Ciências Biológicas. Laboratório de Genética Animal. Vitória. BR
Genet. mol. biol ; 30(1): 43-53, 2007. mapas, tab
Article in English | LILACS | ID: lil-445682
ABSTRACT
The karyotypes of 85 specimens of Oligoryzomys nigripes (Rodentia, Sigmodontinae) collected in the Cerrado and Atlantic Forest of seven states of Brazil were analyzed. Eighty four specimens presented a karyotype with 2n = 62 and one individual had 2n = 61 due to a monosomy of the X chromosome. High levels of intra- and inter-population karyotypic variability, due to sex chromosomes heteromorphisms and pericentric inversions in four autosomes (pairs 2, 3, 4 and 8), led to a variation of the autosomal arm numbers (fundamental number, FN) from 78 to 82. Synaptonemal complex analyses revealed normal meiosis in males heterozygous for pericentric inversions. We found 39 different cytotypes, 27 of which are herein described for the first time. A literature survey revealed 46 described karyotypes for O. nigripes. We tested the hypothesis that chromosomal variants frequencies are dependent on geographical distribution and we propose a model for the karyotypical evolution of Oligoryzomys nigripes with 2n = 62/FN = 78-82.
Full text: Available Index: LILACS (Americas) Country/Region as subject: South America / Brazil Language: English Journal: Genet. mol. biol Journal subject: Genetics Year: 2007 Type: Article Affiliation country: Brazil Institution/Affiliation country: Universidade Federal do Espírito Santo/BR / Universidade de São Paulo/BR

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Full text: Available Index: LILACS (Americas) Country/Region as subject: South America / Brazil Language: English Journal: Genet. mol. biol Journal subject: Genetics Year: 2007 Type: Article Affiliation country: Brazil Institution/Affiliation country: Universidade Federal do Espírito Santo/BR / Universidade de São Paulo/BR