Variations in ribosomal DNA and mitochondrial DNA among chromosomal species of subterranean mole rats |
| |
Authors: | Suzuki H; Wakana S; Yonekawa H; Moriwaki K; Sakurai S; Nevo E |
| |
Institution: | Division of Molecular Genetics, Jikei University School of Medicine, Tokyo, Japan. |
| |
Abstract: | Restriction site variations in nuclear ribosomal DNA (rDNA) spacers and
mitochondrial DNA (mtDNA) were examined in several populations of mole rats
with variable numbers of chromosomes, which represented the two
superspecies Spalax leucodon (2n = 38, 54, or 62) and Spalax ehrenbergi (2n
= 52, 54, 58, or 60). Sequence divergence of rDNA spacers between the
members of the superspecies was approximately 8%, while the variation
within each superspecies was 4% on average. The intrasuperspecies
differentiation of rDNA spacers was generally associated with changes in
the diploid number of chromosomes. However, substantial divergence
(approximately 1.5%) was also detected among populations with the same
diploid number of chromosomes. The sequence divergence of mtDNA among
haplotypes of S. ehrenbergi was 10% or higher and among haplotypes of S.
leucodon it was approximately 12%. By contrast, the range of sequence
divergence between superspecies was 7.4%-12%. The large divergence of
mtDNAs within each superspecies of mole rats may be explained by the
preservation of ancient mtDNA polymorphisms.
|
| |
Keywords: | |
本文献已被 Oxford 等数据库收录! |
|