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

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 h...

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Published inGenetics and molecular biology Vol. 26; no. 3; pp. 253 - 257
Main Authors Fagundes, Valéria, Christoff, Alexandre Uarth, Amaro-Ghilard, Renata Cecília, Scheibler, Daniel R., Yonenaga-Yassuda, Yatiyo
Format Journal Article
LanguageEnglish
Published Sociedade Brasileira de Genética 2003
Subjects
BIOCHEMISTRY & MOLECULAR BIOLOGY
chromosomes
GENETICS & HEREDITY
karyotype
NORs
Rodentia
Sciurus aestuans ingrami
Squirrels
karyotype
Squirrels
NORs
chromosomes
Rodentia
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Summary: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.
Bibliography:ObjectType-Article-2
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ISSN:1415-4757
1678-4685
1415-4757
1678-4685
DOI:10.1590/S1415-47572003000300007