Evolutionary Genomics and Conservation of the Endangered Przewalski’s Horse

Clio Der Sarkissian, Luca Ermini, Mikkel Schubert, Melinda A. Yang, Pablo Librado, Matteo Fumagalli, Hákon Jónsson, Gila Kahila Bar-Gal, Anders Albrechtsen, Filipe G. Vieira, Bent Petersen, Aurélien Ginolhac, Andaine Seguin-Orlando, Kim Magnussen, Antoine Fages, Cristina Gamba, Belen Lorente-Galdos, Sagi Polani, Cynthia Steiner, Markus NeuditschkoVidhya Jagannathan, Claudia Feh, Charles L. Greenblatt, Arne Ludwig, Natalia I. Abramson, Waltraut Zimmermann, Renate Schafberg, Alexei Tikhonov, Thomas Sicheritz-Pontén, Eske Willerslev, Tomas Marques-Bonet, Oliver A. Ryder, Molly McCue, Stefan Rieder, Tosso Leeb, Montgomery Slatkin, Ludovic Orlando

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    Przewalski’s horses (PHs, Equus ferus ssp. przewalskii) were discovered in the Asian steppes in the 1870s and represent the last remaining true wild horses. PHs became extinct in the wild in the 1960s but survived in captivity, thanks to major conservation efforts. The current population is still endangered, with just 2,109 individuals, one-quarter of which are in Chinese and Mongolian reintroduction reserves [ 1]. These horses descend from a founding population of 12 wild-caught PHs and possibly up to four domesticated individuals [ 2, 3 and 4]. With a stocky build, an erect mane, and stripped and short legs, they are phenotypically and behaviorally distinct from domesticated horses (DHs, Equus caballus). Here, we sequenced the complete genomes of 11 PHs, representing all founding lineages, and five historical specimens dated to 1878–1929 CE, including the Holotype. These were compared to the hitherto-most-extensive genome dataset characterized for horses, comprising 21 new genomes. We found that loci showing the most genetic differentiation with DHs were enriched in genes involved in metabolism, cardiac disorders, muscle contraction, reproduction, behavior, and signaling pathways. We also show that DH and PH populations split ∼45,000 years ago and have remained connected by gene-flow thereafter. Finally, we monitor the genomic impact of ∼110 years of captivity, revealing reduced heterozygosity, increased inbreeding, and variable introgression of domestic alleles, ranging from non-detectable to as much as 31.1%. This, together with the identification of ancestry informative markers and corrections to the International Studbook, establishes a framework for evaluating the persistence of genetic variation in future reintroduced populations.
    Original languageEnglish
    JournalCurrent Biology
    Volume25
    Issue number19
    Pages (from-to)2577-2583
    Number of pages7
    ISSN0960-9822
    DOIs
    Publication statusPublished - 2015

    Cite this

    Der Sarkissian, C., Ermini, L., Schubert, M., Yang, MA., Librado, P., Fumagalli, M., Jónsson, H., Bar-Gal, GK., Albrechtsen, A., Vieira, FG., Petersen, B., Ginolhac, A., Seguin-Orlando, A., Magnussen, K., Fages, A., Gamba, C., Lorente-Galdos, B., Polani, S., Steiner, C., ... Orlando, L. (2015). Evolutionary Genomics and Conservation of the Endangered Przewalski’s Horse. Current Biology, 25(19), 2577-2583. https://doi.org/10.1016/j.cub.2015.08.032