Context:

A Nature study analyzing DNA from 15,836 ancient human remains finds that natural selection has continued shaping human genetics in the past 10,000 years, affecting hundreds of genes. The work overturns the idea that modern humans evolved little biologically since antiquity, suggesting thousands of variants may have been acted upon by selection. One notable finding is a mutation linked to celiac disease that emerged about 4,000 years ago and has risen in frequency, contributing to the condition now affecting roughly 80 million people globally. The research, led by David Reich and colleagues, points to ongoing biological evolution alongside cultural change, with broad implications for understanding health and adaptation. The study underscores a dynamic, continuing evolutionary process rather than a static modern human genome.

Dive Deeper:

• The research analyzed ancient DNA from 15,836 remains and identified 479 genetic variants that appear to have been favored by natural selection in the last 10,000 years, with thousands more likely affected by selection.

• This challenges the long-standing view that human evolution has been largely inactive in the recent past, highlighting substantial genetic shifts alongside cultural advances.

• A specific example is a mutation strongly associated with celiac disease that emerged about 4,000 years ago and increased in frequency, suggesting a relatively recent development in disease susceptibility.

• Today, roughly 80 million people worldwide are estimated to have celiac disease, illustrating the real-world impact of relatively recent genetic changes on health.

• David Reich, a Harvard geneticist and co-author, emphasizes the magnitude of these findings, noting the difficulty of grasping how many genetic variants were shaped by natural selection in the recent millennia.

• The study relies on large-scale ancient DNA analysis and aims to map how natural selection has sculpted the human genome beyond the era of purely cultural evolution.

• Published in the journal Nature, the work reframes our understanding of human evolution as an ongoing process with significant implications for biology, medicine, and the interpretation of genetic variation.