Fixed nucleotide differences on the Y chromosome indicate clear divergence between Equus przewalskii and Equus caballus
2003
Wallner, B. | Brem, G. | Müller, M. | Achmann, R.
The phylogenetic relationship between Equus przewalskii and E. caballus is often a matter of debate, Although these taxa have different chromosome numbers, they do not form monophyletic clades in a phylogenetic tree based on mtDNA sequences. Here we report sequence variation from five newly identified Y chromosome regions of the horse. Two fixed nucleotide differences on the Y chromosome clearly display Przewalski's horse and domestic horse as sister taxa. At both positions the Przewalski's horse haplotype shows the ancestral state, in common with the members of the zebra/ass lineage. We discuss the factors that may have led to the differences in mtDNA and Y-chromosomal observations.
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