11/20/2025
Scientists at Stockholm University have made a groundbreaking discovery by isolating and sequencing RNA from Yuka, a 40,000 year old woolly mammoth preserved in Siberian permafrost. Found by tusk hunters in the Arctic, Yukas body was remarkably intact with preserved tissues, fur, and even brain matter, allowing researchers to extract this ancient genetic material for the first time. The RNA, the oldest ever recovered, shows which genes were active in her cells just before death and includes ancient microRNAs plus unique mutations proving its mammoth origin. Published in the journal Cell, the study demonstrates that RNA can survive tens of thousands of years in frozen conditions, paving the way for deeper insights into the biology, traits, and diseases of extinct species.