Ancient DNA Study Uncovers Hundreds of Recent Adaptive Human Variants

A research team analyzed DNA from 15,836 ancient human remains spanning the last 10,000 years. The analysis identified 479 genetic variants that show statistical signatures of positive natural selection within this period. The authors also estimate that thousands of additional variants have likely been subject to selection, expanding the catalog of recent adaptive changes far beyond the few dozen previously documented. Prior to this work, only a few dozen variants had been identified as recent targets of positive selection.

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For decades, many scholars argued that the relatively short span of a few hundred generations since the advent of agriculture and technology left little opportunity for measurable biological evolution. The prevailing view held that cultural innovations—such as agriculture, metallurgy, and writing—had eclipsed measurable genetic change on human populations.

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The study was led by David Reich, a geneticist at Harvard Medical School, who is listed as a co-author. The findings were published in the peer-reviewed journal *Nature*. The work involved collaboration among multiple laboratories specializing in ancient DNA extraction, sequencing, and statistical genetics.

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• Ancient samples examined: 15,836 individuals.

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• Variants with strong selection signals: 479.

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• Additional variants inferred to be under selection: several thousand (exact number not specified).

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• A mutation linked to celiac disease emerged approximately 4,000 years ago.

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• Current global prevalence of celiac disease: about 80 million people.

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The authors conclude that natural selection has been more active in the Holocene than previously recognized. They argue that the identified celiac-related mutation, which post-dates the Egyptian pyramids, illustrates that disease susceptibility can evolve on historical timescales. The broader inference is that many traits—potentially including metabolism, immunity, and adaptation to new environments—have been shaped by recent evolutionary forces.

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The study directly challenges earlier scholarly positions that emphasized cultural over biological change in the last ten millennia. Those earlier perspectives suggested that the pace of genetic adaptation would be negligible compared with the speed of technological and societal transformation.

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> “There are so many of them that it’s hard to wrap one’s mind around them.” — David Reich, Geneticist, Harvard Medical School

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