Oldest ever RNA sample recovered from woolly mammoth

A groundbreaking discovery has been made as scientists have unearthed the world’s oldest RNA from a woolly mammoth frozen in the Siberian permafrost for almost 40,000 years. The specimen, named Yuka, is considered the most well-preserved woolly mammoth ever found and was initially thought to be a juvenile female who met her demise, potentially after an encounter with cave lions, at the age of 6 to 8 years old.

While DNA extraction from woolly mammoths has been successful in the past, with some samples dating back over a million years, this new finding of ancient RNA opens up new possibilities for understanding the genetic makeup of these extinct creatures. The recovery of RNA, which decodes genetic instructions for protein synthesis, is a significant achievement due to its unstable nature and rapid degradation post-mortem.

Previously, the oldest recovered RNA was from a wolf preserved in Siberian permafrost over 14,000 years ago. However, researchers led by Love Dalén at Stockholm University have managed to extract RNA from Yuka’s leg, nearly tripling the previous record.

The team employed specialized techniques to retrieve and analyze the ancient RNA molecules, shedding light on the gene activity at the time of Yuka’s death. Signs of gene activity related to muscle metabolism and cell stress were identified, aligning with the theory of Yuka succumbing to a cave lion attack.

Surprisingly, the analysis revealed that Yuka was actually a male, correcting the initial assumption of her being a female. Dalén explains that the specimen’s preservation, despite its age, facilitated the RNA extraction process, offering insights into the genetic traits and characteristics of woolly mammoths.

While the study did not uncover any significant RNA viruses in Yuka, Dalén anticipates future research on ancient RNA viruses from other ice age specimens. The findings, although not directly applicable to mammoth de-extinction efforts, provide valuable information on genetic traits and developmental mechanisms in these prehistoric creatures.

Merlin Crossley, a researcher at the University of New South Wales, acknowledges the technical feat of recovering ancient RNA but suggests that the study’s biological implications may be limited. He believes that the team has pushed the boundaries of RNA preservation and that obtaining useful information from other mammoth specimens may prove challenging due to their rarity.

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