A large-scale genomic analysis of remains from the Hindu Kush-Himalayan corridor has uncovered the earliest known evidence of genetic adaptation to extreme cold. Published in Cell Reports, the study identifies mutations in the TRPM8 and UCP1 genes in 8,500-year-old individuals, which are associated with enhanced non-shivering thermogenesis and improved peripheral blood flow. This allowed early post-glacial foragers to thrive in high-altitude environments where temperatures remained below freezing for the majority of the year.
The research, conducted by the Anthropological Survey of India, suggests that these populations were genetically distinct from lowland groups by the early Holocene. This finding challenges previous theories that high-altitude settlement was a late-stage development driven by agricultural pressure. Instead, the genetic data points to a specialized pulse of 'cold-adapted' hunter-gatherers who mastered the high-mountain ecosystems shortly after the retreat of the glaciers, laying the genetic foundation for modern Himalayan ethnic groups.