Description of the karyotype of Rhagomys rufescens Thomas, 1886 (Rodentia, Sigmodontinae) from Southern Brazil Atlantic forest
Genet. mol. biol
; 33(3): 479-485, 2010. ilus, mapas, tab
Article
in English
| LILACS
| ID: lil-555825
Responsible library:
BR26.1
ABSTRACT
Rhagomys rufescens (Rodentia Sigmodontinae) is an endemic species of the Atlantic forest from Southern and Southeastern Brazil. Some authors consider Rhagomys as part of the tribe Thomasomyini; but its phylogenetic relationships remain unclear. Chromosomal studies on eight specimens of Rhagomys rufescens revealed a diploid number of 2n = 36 and a number of autosome arms FN = 50. GTG, CBG and Ag-NOR banding and CMA3/DAPI staining were performed on metaphase chromosomes. Eight biarmed and nine acrocentric pairs were found in the karyotype of this species. The X and Y chromosomes were both acrocentric. Most of the autosomes and the sex chromosomes showed positive C-bands in the pericentromeric region. The X chromosome showed an additional heterochromatic block in the proximal region of the long arm. Nucleolus organizer regions (NORs) were located in the pericentromeric region of three biarmed autosomes (pairs 4, 6 and 8) and in the telomeric region of the short arm of three acrocentrics (pairs 10, 12 and 17). CMA3/DAPI staining produced fluorescent signals in many autosomes, especially in pairs 4, 6, and 8. This study presents cytogenetic data of Rhagomys rufescens for the first time.
Full text:
Available
Collection:
International databases
Database:
LILACS
Main subject:
Rodentia
/
Cytogenetic Analysis
/
Nucleolus Organizer Region
Limits:
Animals
Country/Region as subject:
South America
/
Brazil
Language:
English
Journal:
Genet. mol. biol
Journal subject:
Genetics
Year:
2010
Document type:
Article
Affiliation country:
Brazil
Institution/Affiliation country:
Fundação Universidade Regional de Blumenau/BR
/
Universidade Federal do Paraná/BR
/
Universidade Federal do Rio Grande do Sul/BR