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
Dans Anglais
| 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:
Texte intégral:
Disponible
Indice:
LILAS (Amériques)
Sujet Principal:
Sciuridae
/
Zébrage chromosomique
/
Organisateur nucléolaire
Limites du sujet:
Animaux
Pays comme sujet:
Amérique du Sud
/
Brésil
langue:
Anglais
Texte intégral:
Genet. mol. biol
Thème du journal:
Génétique
Année:
2003
Type:
Article
Pays d'affiliation:
Brésil
Institution/Pays d'affiliation:
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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