Divergent biological consequences of APOE isoforms across industrialized and non-industrial environments.

APOE ε4 influences cholesterol, immunity, and reproduction differently across industrialized and non-industrial environments, with effects varying by lifestyle and population.

• Why it matters: Understanding how APOE ε4 impacts health in diverse environments is crucial because its effects are inconsistent and may have evolved to confer benefits in ancestral settings, yet pose risks today.
• What they did: The study examined APOE genotypes in Turkana and Orang Asli populations across a spectrum of lifestyles, analyzing their associations with cholesterol, immune biomarkers, and reproductive traits, including genotype x environment interactions.
• The result: Findings confirmed APOE ε4's link to altered cholesterol levels and revealed environment-dependent immune effects, with a weak association between APOE ε4 and extended reproductive lifespan, emphasizing environmental context in APOE-related biology.