Water bear DNA: How the only animals to survive in space do it (VIDEO).

"Water Bears," the Only Animals That Can Survive in Space, Have a Big Secret in Their DNA (Video)

"Water Bears," the Only Animals That Can Survive in Space, Have a Big Secret in Their DNA (Video)

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Nov. 28 2015 11:05 AM

The Water Bear’s Secret

The only animal that can survive in space has seriously weird DNA.

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Courtesy of PNAS

Tiny tardigrades are amazing: the seemingly indestructible animals are the only ones known to survive the vacuum of space, and now researchers publishing in PNAS report one-sixth of their DNA comes from foreign organisms.

Tardigrades, the researchers said, survive extreme temperatures by withstanding desiccation. When they dry out, their DNA breaks into small pieces. When they rehydrate and repair their DNA, they take in foreign DNA through temporary leaky cell membranes. This genetic variation has likely made the tardigrades evolve more tricks to help them withstand harsh environments.