A breakthrough study published in Nature Genetics has analyzed the genomes of 12,000-year-old human remains discovered in the Aleutian Islands, revealing a unique evolutionary adaptation. The research identifies a specific genetic sequence linked to enhanced IgA production efficiency, which provided early maritime foragers with a critical defense against endemic sub-arctic aquatic pathogens found in cold-water estuary environments.
This genetic signature represents one of the earliest known examples of localized pathogen-driven selection in the North Pacific. The findings suggest that these populations were not merely migrating through the region but had established long-term ecological niches that required specialized physiological responses to survive the unique biological challenges of the sub-arctic maritime ecosystem during the terminal Pleistocene.