The Harvard study found that natural selection favored the red hair gene over time

By analyzing nearly 16,000 ancient genomes spanning 10,000 years, researchers have identified a list of traits that nature is actively pushing forward. Among the most prominent are genetic variants of red hair.

“Having red hair may have been beneficial 4,000 years ago, or it may have come with a more important trait,” the researchers noted.

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The study, published in the journal Nature, relied on a large database of ancient DNA Western Eurasia. Using new computing methods, the team was able to filter out random fluctuations in DNA to identify what they called “directional selection.”

Directional selection occurs when a particular version of a gene gives an organism a strong survival or reproductive advantage, making it more common in a population faster than it would happen by chance, according to experts.

Directional selection occurs when a particular gene provides such important benefits that its frequency across a population rises much faster than by random chance. (Istock)

Before this study, scientists knew of only about 21 such cases History of humanityOne of them is lactose intolerance. This new research has uncovered hundreds more.

“With these new technologies and a large amount of ancient genomic data, we can now watch how selection has shaped biology in real time,” Ali Akbari, first author of the study and a senior scientist in the laboratory of Harvard geneticist David Reich, said in a press release.

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The data showed that genetic markers for red hair are among 479 genetic variants that have been strongly favored over the past 10,000 years. One possible explanation, the researchers said, is a major shift in human history: the transition to agriculture.

Scientists have long pointed to vitamin D synthesis as a possible driver of traits such as pale skin and light hair. (Istock)

As humans moved away from hunter-gatherers and settled into agricultural societies, their environment and behavior changed radically, leading to an evolutionary “acceleration.”

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While the Harvard study provides the first definitive statistical evidence that red hair was actively selected for during the rise of agriculture, the researchers note that the exact prehistoric interest still requires further study.

However, scholars have long pointed out Vitamin D synthesis As a possible driver of the emergence of these lighter-pigmented traits in northern climates.

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While redheads still make up a minority of the world’s population today, analysis of the Harvard study suggests they may not be just an evolutionary accident.

While redheads still represent a minority of the world’s population today, analysis of the Harvard study suggests they may not be just an evolutionary accident. (Istock)

Instead, the red-haired trait was “enhanced” by natural selection as humans adapted to the challenges of the modern world, according to the researchers.

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The researchers urged caution in how these results are interpreted.

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“What the variant is associated with now is not necessarily why the allele is spreading,” the researchers noted.