Mitochondrial DNA evolution in the genus Equus.

@article{citeulike:2790697, abstract = {Employing mitochondrial DNA (mtDNA) restriction-endonuclease maps as the basis of comparison, we have investigated the evolutionary affinities of the seven species generally recognized as the genus Equus. Individual species' cleavage maps contained an average of 60 cleavage sites for 16 enzymes, of which 29 were invariant for all species. Based on an average divergence rate of 2\%/Myr, the variation between species supports a divergence of extant lineages from a common ancestor approximately 3.9 Myr before the present. Comparisons of cleavage maps between Equus przewalskii (Mongolian wild horse) and E. caballus (domestic horse) yielded estimates of nucleotide sequence divergence ranging from 0.27\% to 0.41\%. This range was due to intraspecific variation, which was noted only for E. caballus. For pairwise comparisons within this family, estimates of sequence divergence ranged from 0\% (E. hemionus onager vs. E. h. kulan) to 7.8\% (E. przewalskii vs. E. h. onager). Trees constructed according to the parsimony principle, on the basis of 31 phylogenetically informative restriction sites, indicate that the three extant zebra species represent a monophyletic group with E. grevyi and E. burchelli antiquorum diverging most recently. The phylogenetic relationships of E. africanus and E. hemionus remain enigmatic on the basis of the mtDNA analysis, although a recent divergence is unsupported.}, address = {Research Department, Zoological Society of San Diego, California 92112.}, author = {George, M. and Ryder, O. A. }, citeulike-article-id = {2790697}, issn = {0737-4038}, journal = {Molecular biology and evolution}, keywords = {przewalskii}, month = {November}, number = {6}, pages = {535--546}, posted-at = {2008-05-12 20:46:58}, priority = {2}, title = {Mitochondrial DNA evolution in the genus Equus.}, url = {http://view.ncbi.nlm.nih.gov/pubmed/2832696}, volume = {3}, year = {1986} }

TY - JOUR ID - citeulike:2790697 L3 - citeulike-article-id:2790697 TI - Mitochondrial DNA evolution in the genus Equus. JF - Molecular biology and evolution VL - 3 IS - 6 SP - 535 EP - 546 AD - Research Department, Zoological Society of San Diego, California 92112. SN - 0737-4038 N2 - Employing mitochondrial DNA (mtDNA) restriction-endonuclease maps as the basis of comparison, we have investigated the evolutionary affinities of the seven species generally recognized as the genus Equus. Individual species' cleavage maps contained an average of 60 cleavage sites for 16 enzymes, of which 29 were invariant for all species. Based on an average divergence rate of 2%/Myr, the variation between species supports a divergence of extant lineages from a common ancestor approximately 3.9 Myr before the present. Comparisons of cleavage maps between Equus przewalskii (Mongolian wild horse) and E. caballus (domestic horse) yielded estimates of nucleotide sequence divergence ranging from 0.27% to 0.41%. This range was due to intraspecific variation, which was noted only for E. caballus. For pairwise comparisons within this family, estimates of sequence divergence ranged from 0% (E. hemionus onager vs. E. h. kulan) to 7.8% (E. przewalskii vs. E. h. onager). Trees constructed according to the parsimony principle, on the basis of 31 phylogenetically informative restriction sites, indicate that the three extant zebra species represent a monophyletic group with E. grevyi and E. burchelli antiquorum diverging most recently. The phylogenetic relationships of E. africanus and E. hemionus remain enigmatic on the basis of the mtDNA analysis, although a recent divergence is unsupported. KW - przewalskii AU - George, M AU - Ryder, OA PY - 1986/11// UR - http://view.ncbi.nlm.nih.gov/pubmed/2832696 ER -