A large-scale genetic study has revealed that the gene for red hair has been positively selected over the last 10,000 years in Europe, suggesting that redheads may ultimately be evolutionary "winners." The research aimed to explore if human evolution has plateaued since agriculture began, by analyzing DNA from approximately 16,000 ancient remains and over 6,000 contemporary individuals.
Scientists identified 479 genetic variants favored by natural selection, including those linked to red hair, fair skin, and certain health conditions like celiac disease, as well as variants associated with reduced risk of diabetes and rheumatoid arthritis. The study also found that genes related to red hair and light skin likely reflect adaptations for enhanced vitamin D synthesis in low-sunlight regions, beneficial for agricultural communities with limited dietary vitamin D.
Additionally, while identifying gene variants beneficial for survival, researchers observed complex patterns, such as increasing prevalence of mutations associated with celiac disease and tuberculosis risk over time. These patterns suggest that certain genetic traits may have offered survival advantages during specific periods despite their health risks.
The research also highlighted negative selection for genes promoting high body fat, indicating that traits advantageous for hunter-gatherers became less favorable with the advent of agriculture. Overall, the study provides insights into the ongoing forces shaping human biology and evolution, with implications for understanding genetic trends across populations. The findings were published in Nature.
