Multiple interstitial ribosomal sites (NORs) in the Brazilian squirrel Sciurus aestuans ingrami (Rodentia, Sciuridae) with 2n = 40: an overview of Sciurus cytogenetics

AUTOR(ES)

Fagundes, Valéria, Christoff, Alexandre Uarth, Amaro-Ghilard, Renata Cecília, Scheibler, Daniel R., Yonenaga-Yassuda, Yatiyo

FONTE

Genetics and Molecular Biology

DATA DE PUBLICAÇÃO

2003

RESUMO

This is the first time the karyotype of the Brazilian squirrel Sciurusaestuans ingrami, with 2n = 40, is described. The karyotype of this species comprises 18 pairs of biarmed and one minute pair of acrocentric autosomes, a medium-sized submetacentric X and a medium-sized acrocentric Y. Four pairs have an interstitial secondary constriction, co-located with nucleolar organizer regions (NORs), identified by silver-staining technique and fluorescent in situ hybridization (FISH) with ribosomal 18S/28S probes. The occurrence of multiple interstitial NORs is rare in rodents, and this is one of the few examples, identified by a molecular cytogenetics approach.

Documentos Relacionados

• Feeding behavior of the squirrel Sciurus ingrami (Rodentia: Sciuridae)
• Ninhos do esquilo brasileiro Sciurus ingrami Thomas (Rodentia, Sciuridae)
• Dieta de Sciurus ingrami Thomas (Rodentia, Sciuridae) em um remanescente de Floresta com Araucária, Paraná, Brasil
• Thaptomys Thomas 1915 (Rodentia, Sigmodontinae, Akodontini) with karyotypes 2n = 50, FN = 48, and 2n = 52, FN = 52: two monophyletic lineages recovered by molecular phylogeny
• A remarkable autosomal heteromorphism in Pseudoryzomys simplex 2n = 56; FN = 54-55 (Rodentia, Sigmodontinae)