Multiple interstitial ribosomal sites (NORs) in the Brazilian squirrel Sciurus aestuans ingrami (Rodentia, Sciuridae) with 2n = 40: an overview of Sciurus cytogenetics
Genet. mol. biol
;
26(3): 253-257, 2003. ilus
Article
in English
| LILACS
| ID: lil-346313
ABSTRACT
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:
Full text:
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Index:
LILACS (Americas)
Main subject:
Sciuridae
/
Chromosome Banding
/
Nucleolus Organizer Region
Limits:
Animals
Country/Region as subject:
South America
/
Brazil
Language:
English
Journal:
Genet. mol. biol
Journal subject:
Genetics
Year:
2003
Type:
Article
Affiliation country:
Brazil
Institution/Affiliation country:
Universidade Federal do Espírito Santo/BR
/
Universidade Federal do Rio Grande do Sul/BR
/
Universidade Luterana do Brasil/BR
/
Universidade de São Paulo/BR
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