Phylogenetic relationships and karyotype evolution in the sigmodontine rodent Akodon (2n = 10 and 2n = 16) from Brazil
Genet. mol. biol
; 29(3): 469-474, 2006. ilus, mapas
Article
in En
| LILACS
| ID: lil-450283
Responsible library:
BR26.1
ABSTRACT
Comparison of G-bands from 2n = 10 and 2n = 16 karyotypes of Akodon revealed tandem fusions, pericentric inversions and Robertsonian rearrangement in autosomes and addition/deletion of constitutive heterochromatin in sex chromosomes. Cytochrome-b sequences indicate that the 2n = 10 karyotype is a new species and show it to be a sister taxon of the 2n = 14, 2n = 15 and 2n = 16 karyotypes. Indeed, this group shows a particular evolutionary situation in which a unique taxonomic unit based on morphological data can be detected, but, karyologically, it can be separated into two groups (2n = 14-15-16 and 2n = 10). Cytochrome-b sequences show a finer resolution, indicating that these four karyotypes represent three molecular entities (2n = 14-15, 2n = 16 and 2n = 10) that may be derived from a common ancestor with a 2n = 16 karyotype.
Full text:
1
Index:
LILACS
Main subject:
Phylogeny
/
Rodentia
/
Chromosome Banding
Limits:
Animals
Country/Region as subject:
America do sul
/
Brasil
Language:
En
Journal:
Genet. mol. biol
Journal subject:
GENETICA
Year:
2006
Type:
Article