alexa Evolutionary history of the genus Capra (Mammalia, Artiodactyla): Discordance between mitochondrial DNA and Y-chromosome phylogenies
Environmental Sciences

Environmental Sciences

Journal of Biodiversity & Endangered Species

Author(s): Nathalie Pidancier, Steve Jordan, Gordon Luikart, Pierre Taberlet

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The systematics of the genus Capra remain controversial in spite of studies conducted using morphology, mtDNA, and allozymes. Here, we assess the evolutionary history of Capra (i) using phylogenetic analysis of two nuclear genes located on the Y-chromosome and (ii) previously published and new cytochrome b sequences. For the Y-chromosome phylogeny, we sequenced segments from the amelo- genin (AMELY) and zinc W nger (ZFY) genes from all of the eight wild taxa and from domestic goats ( Capra hircus ). Phylogenetic analy- sis of the Y-chromosome data revealed two well-de W ned clades. The domestic goat ( C. hircus ), the bezoar ( Capra aegagrus ), and the markhor ( C. falconeri ) belong to one clade (ML bootstrap value [BP]: 98%), suggesting that domestic goats originated from one or both of these wild species. The second clade (ML BP: 92%) is comprised of all the other wild species. Horn morphology is generally c oncordant with the Y-chromosome phylogeny. The mtDNA data also revealed two well-de W ned clades. However, the species in each clade are di V er- ent from those inferred from the Y-chromosome data. To explain the discordance between Y-chromosome and mtDNA phylogenies, sev- eral hypotheses are considered. We suggest that a plausible scenario involves mtDNA introgression between ancestral taxa before the relatively recent colonization of Western Europe, the Caucasus Mountains, and East Africa by Capra populations.

This article was published in Molecular Phylogenetics and Evolution and referenced in Journal of Biodiversity & Endangered Species

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