Study Finds Red Hair Gene Favored by Natural Selection Over Last 10,000 Years

Evolutionary Trends

in Human Genetics A comprehensive study analyzing DNA from nearly 16,000 ancient human remains alongside more than 6,000 living individuals has found that natural selection has actively favored the gene for red hair in Europe over the past 10,000 years.

This research challenges the notion that human evolution has plateaued since the development of agriculture. Among these, genes linked to red hair, fair skin, susceptibility to coeliac disease, and variants associated with reduced risks of diabetes, baldness, and rheumatoid arthritis have all increased in frequency during recent history.

Possible Reasons Behind

Genetic Selection Researchers noted that the selection for red hair and fair skin may relate to improved vitamin D synthesis in regions with low sunlight, particularly among farming populations with limited dietary vitamin D.

However, the study did not aim to determine the exact causes of these trends. Some genetic variants with seemingly negative health effects, such as a mutation increasing the risk of coeliac disease and an immune gene raising tuberculosis susceptibility, also rose in prevalence at certain times.

This suggests these genes might have provided advantages against other pathogens or environmental pressures during specific historical periods.

The study also observed negative selection against genes promoting high body fat percentage, supporting the "thrifty genes" hypothesis. This theory posits that genetic adaptations beneficial for fat storage in hunter-gatherer societies became disadvantageous after the shift to more stable food supplies through farming.

Methodology and Scope Using

advanced computational techniques and an unprecedented volume of ancient genomic data, the researchers tracked how natural selection influenced human biology in real time.

The findings add to a limited number of known cases where genetic traits have been clearly shaped by natural selection since modern humans emerged approximately 300,000 years ago. Previously identified examples include genes related to adult lactose tolerance.

" — Study author, Harvard University (The Guardian) The study was published in the journal Nature and contributes to ongoing research into how human genetics continue to evolve in response to environmental and cultural changes.