[Chromosome arrangements and cytogenetic differentiation of two species of African mice of the genus Mus (Rodentia, Muridae)].
Karyotypes of two African mouse species, Mus mahomet, 2n = 36, NFa = 34 (34A + XA + YA) and Mus sp. A, 2n = 34, NFa = 32 (32A + XA + YA), from five localities of the Bale Mountains National Park, Ethiopia, were analyzed. In both species all autosomes contained C-positive pericentromeric blocks. In M. mahomet, heterochromatin blocks of different chromosomes varied in size. In addition, the X chromosomes of both species contained a pericentromeric block and showed more intensive staining throughout the chromosome. The Y chromosome was two times larger in Mus sp. A than in M. mahomet and C-positive in both species. Comparative analysis of G-banding patterns revealed a similarity with respect to nine autosomes and the X chromosome. Autosome 1 of Mus sp. A was demonstrated to result from centromere-telomere fusion of two M. mahomet acrocentrics. The other five autosomes represent different linkage groups determining a specificity of the karyotypes. The karyotypes of M. mahomet and Mus sp. A were also compared with that of M. musculus. The evolution of M. mahomet and Mus sp. A karyotypes was shown to have involved structural rearrangements in 10 and 12 autosomes, respectively. The high karyological divergence confirmed molecular phylogenetic data. The cytogenetic differences T of M. musculus C from M. mahomet and Mus sp. A are high enough to different genera.
Aniskin
V M
VM
Severtsov Institute of the Problems of Ecology and Evolution, Russian Academy of Sciences, Moscow, Russia.
Lavrenchenko
L A
LA
Varshavskiĭ
A A
AA
Milishnikov
A N
AN
D000818:Animals; D001399:Azure Stains; D002871:Chromosome Banding; D005002:Ethiopia; D015321:Gene Rearrangement; D006570:Heterochromatin / Q000235:genetics; D007621:Karyotyping; D051379:Mice; D009115:Muridae / Q000235:genetics*; D010802:Phylogeny; D013045:Species Specificity; D014960:X Chromosome; D014998:Y Chromosome
D001399:Azure Stains; D006570:Heterochromatin
Khromosomnye nabory i tsitogeneticheskaia differentsiatsiia dvukh vidov Afrikanskikh mysheĭ roda Mus (Rodentia, Muridae).