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The research article investigates the adaptive genetic traits that allow Yakutian horses in Siberia to survive in extremely cold environments. The study delves into the evolutionary origins of these horses, revealing them as one of the fastest adaptations to arctic temperatures, and identifies pivotal genes related to hair development, body size, and metabolic functions that form part of the horse’s adaptive genetic makeup.
The research focuses on Yakutian horses in Siberia, known for their remarkable adaptations that enable them to withstand harsh cold temperatures, including:
However, the origins of these horses and the underlying genetic groundwork of their adaptations remained largely unexplored. To investigate this, the researchers sequenced and analyzed the full genomes of nine present-day Yakutian horses and two ancient specimens approximately from the early 19th century and about 5,200 years ago.
The genomes of the Yakutian horses were compared with those of Late Pleistocene horses, domesticated horses, and wild Przewalski’s horses. This comparison revealed that modern Yakutian horses did not descend from native horses that populated the region until around the mid-Holocene.
Instead, they were likely introduced following the migration of the Yakut people just a few centuries ago, marking one of the fastest cases of adaptation to the extreme temperatures of the Arctic.
The researchers identified that cis-regulatory mutations, changes that impact gene expression, contributed more to their adaptation than nonsynonymous changes, changes that impact the resulting protein made by a gene. This is likely due to the limited genetic variation within gene bodies when the population was founded.
They identified genes implicated in hair development, body size, and metabolic and hormonal signaling pathways as key to the adaptive abilities of the Yakutian horse.
The study also found evidence for convergent evolution with native human populations and woolly mammoths, suggesting that there are only a few evolutionary strategies that can ensure survival in extremely cold environments.
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