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Ashley Yeager
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Gene makes old cells act young again

Adult mice that have the gene Lin28a reactivated regrow thicker hair and skin in shaved areas compared with shaved adult mice that do not have the gene turned back on (one shown).

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Turning on a gene called Lin28a in old tissue may help cells heal like they are young again.

Lin28a is active in developing embryos and can control how young animals grow and develop. But the gene is not turned on as often in adult cells. When a team of scientists reactivated Lin28a in a group of adult mice with shaved backs, the animals' skin and hair grew back thicker compared with control mice. Mice with the reactivated gene all showed better tissue healing when parts of their ears and paws were injured.

The results, which appear November 7 in Cell, suggest that reactivating Lin28a, along with other techniques, help could help adult humans heal more quickly after an injury.

Previous studies, however, have also shown that high activity of Lin28a in cancer tissue helps diseased cells grow faster.

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