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Genomic analysis on pygmy hog reveals extensive interbreeding during wild boar expansion
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Genomic analysis on pygmy hog reveals extensive interbreeding during wild boar expansion
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Journal Article
Genomic analysis on pygmy hog reveals extensive interbreeding during wild boar expansion
2019
Overview
Wild boar (
Sus scrofa
) drastically colonized mainland Eurasia and North Africa, most likely from East Asia during the Plio-Pleistocene (2–1Mya). In recent studies, based on genome-wide information, it was hypothesized that wild boar did not replace the species it encountered, but instead exchanged genetic materials with them through admixture. The highly endangered pygmy hog (
Porcula salvania)
is the only suid species in mainland Eurasia known to have outlived this expansion, and therefore provides a unique opportunity to test this hybridization hypothesis. Analyses of pygmy hog genomes indicate that despite large phylogenetic divergence (~2 My), wild boar and pygmy hog did indeed interbreed as the former expanded across Eurasia. In addition, we also assess the taxonomic placement of the donor of another introgression, pertaining to a now-extinct species with a deep phylogenetic placement in the
Suidae
tree. Altogether, our analyses indicate that the rapid spread of wild boar was facilitated by inter-specific/inter-generic admixtures.
The pygmy hog (
Porcula salvania
), now highly endangered and restricted in a small region at the southern foothills of the Himalaya, is the only suid species in mainland Eurasia that outlived the expansion of wild boar (
Sus scrofa
). Here, the authors analyze genomes of pygmy hog and related suid species, and identify signals of introgression among these species.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
