World’s oldest RNA extracted from ice age woolly mammoth

In a remarkable scientific breakthrough, researchers have extracted RNA from the remains of a young woolly mammoth, affectionately named Yuka, which was preserved in Siberian permafrost for approximately 40,000 years. Discovered by tusk hunters in 2010, Yuka's well-preserved state, featuring intact skin, muscle tissue, and even strands of reddish hair, captivated scientists from the very start. While full cloning of Yuka was deemed impossible, the quality of its DNA allowed for some cell nuclei to exhibit limited activity when introduced to mouse eggs. The latest endeavor by a team of researchers at Stockholm University has achieved the extraordinary feat of sequencing Yuka’s RNA, an accomplishment previously thought unattainable. The scientists meticulously processed muscle and tissue samples from Yuka alongside nine other woolly mammoths, employing specialized chemical treatments to extract any remaining RNA fragments. This task is notoriously challenging, as RNA is typically too fragile to survive long after an organism's death. Previous attempts to retrieve RNA from ancient specimens often resulted in failure or contamination, making this achievement even more significant. By utilizing RNA-handling techniques tailored for ancient and fragmented molecules, the team gained access to unprecedented information, including insights into the genes that were active during Yuka's final moments. These findings suggest that as Yuka faced its last moments—potentially due to a cave lion attack—its muscles were contracting, and its cells were signaling distress. This level of detail surpasses what can be gleaned from DNA analysis alone. Emilio Mármol, the lead researcher of the study, emphasized the importance of RNA in understanding the real-time biology of an organism during its life’s end. "Studying DNA provides a wealth of information about an organism's evolutionary history and ancestry. However, by obtaining this delicate layer of cell biology from ancient tissues, we can finally piece together a comprehensive narrative of life’s processes, from DNA to proteins, with RNA serving as a vital messenger," he explained.