Scientists Revived a 46,000-Year-Old Worm From Siberian Permafrost

A tiny roundworm frozen in Siberian permafrost for about 46,000 years was revived, revealing a new species with an unusual way to survive extreme conditions.

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A microscopic roundworm recovered from deep Siberian permafrost has given scientists an extraordinary look at how life can survive extreme conditions. The animal was found in frozen soil from a fossilized burrow about 40 meters underground, and researchers later estimated that the material had remained frozen since roughly 46,000 years ago. After thawing, the nematode became active again and was identified through genetic analysis as a previously undescribed species called Panagrolaimus kolymaensis. The key to its remarkable survival appears to be cryptobiosis, a state in which an organism reduces its metabolism to extremely low levels while conditions are too harsh for normal life. Researchers compared the worm with the better-known laboratory nematode Caenorhabditis elegans and found similarities in genes and biochemical processes linked to this survival strategy. Laboratory experiments also showed that mild drying before freezing improved survival, while the worms increased production of trehalose, a sugar thought to help protect cells during dehydration and freezing. The findings suggest that some nematodes possess biological tools capable of keeping them dormant for extraordinarily long periods, potentially extending the known limits of survival in a frozen state. The 46,000-year estimate comes from radiocarbon dating of plant material associated with the frozen deposit, so the precise age applies to the deposit and its contents rather than being a direct radiocarbon measurement of the microscopic worm itself.

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