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Polar Bears Rewriting DNA to Survive Climate Change
12 Dec
Summary
- Polar bear DNA shows changes related to heat and metabolism.
- Jumping genes in Greenland bears' DNA are becoming more active.
- These genetic shifts may help bears adapt to a warmer climate.
Scientists have identified unique genetic adaptations in polar bears inhabiting warmer regions of Greenland, suggesting a response to climate change. The study reveals that genes associated with heat tolerance, metabolism, and aging are showing altered activity, particularly in south-east Greenland where temperatures are higher.
Researchers observed a significant increase in the activity of 'jumping genes,' mobile DNA elements, within the genomes of these bears. This phenomenon, unprecedented in wild mammals, indicates a rapid genetic rewriting process that could be crucial for their survival as their icy habitats shrink and diets shift.
While these findings provide valuable insights into polar bear resilience and may guide conservation efforts, scientists caution that it does not diminish the extinction risk. They stress the critical importance of global action to reduce fossil fuel burning and slow down accelerating temperature increases to protect these iconic animals.
