Several recent studies have suggested past gene flow between the Przewalski’s horse and modern domestic horse and questioned the wild origin of the Przewalski’s horse. Mitochondrial DNA has placed representatives of the Przewalski’s horse into three among the eighteen haplogroups detected from the modern horse. Of these, two haplogroups have so far been found exclusively in the Przewalski’s horse, while the one shared with the domestic horse includes captive individuals that have uncertain pedigrees. We recently found five domestic horse individuals of North European horse breeds to carry a mitochondrial haplogroup that was previously confined only to the Przewalski’s horse. These individuals were sequenced for 6039 bp of mitochondrial DNA and used, together with domestic and Przewalski’s horse sequences presenting all horse haplogroups, to examine the phylogenetic relationships and to date the divergence time between Przewalski’s and domestic horse clusters within this haplogroup. The divergence was dated to have likely occurred about 13,300–11,400 years ago, which coincides with the time of the Younger Dryas.

中文翻译：

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现代北方家养马携带与普氏野马相似的线粒体 DNA

最近的几项研究表明，普氏野马和现代家养马之间存在过去的基因流动，并质疑普氏野马的野生起源。线粒体 DNA 已将普氏野马的代表置于从现代马身上检测到的 18 个单倍群中的三个。其中，迄今为止仅在普氏野马中发现了两个单倍群，而与家马共享的一个单倍群包括血统不确定的圈养个体。我们最近发现了北欧马品种的五个家养马个体携带以前仅限于普氏原羚马的线粒体单倍群。这些个体被测序了 6039 bp 的线粒体 DNA，并与呈现所有马单倍群的家养和普氏野马序列一起使用，检查系统发育关系并确定该单倍群内普氏野马和家养马群之间的分化时间。这种分歧被认为可能发生在大约 13,300-11,400 年前，这与新仙女木的时间一致。