الوضع الليلي
2:2:15 
2025-12-24 
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The Arctic Ocean current is at its warmest in the last 125,000 years, and temperatures continue to rise. Due to these warming temperatures, more than two-thirds of polar bears are expected to be extinct by 2050, with total extinction predicted by the end of this century.
But in our new study, my colleagues and I found that the changing climate was driving changes in the polar bear genome, potentially allowing them to more readily adapt to warmer habitats.
Provided these polar bears can source enough food and breeding partners, this suggests they may potentially survive these new challenging climates.
We discovered a strong link between rising temperatures in south-east Greenland and changes in polar bear DNA.
DNA is the instruction book inside every cell, guiding how an organism grows and develops. In processes called transcription and translation, DNA is copied to generate RNA and can lead to the production of proteins, and copies of transposons (TEs), also known as "jumping genes".
In carrying out our recent research, we found that there were big differences in the temperatures observed in the north-east, compared with the south-east regions of Greenland.
Our team used publicly available polar bear genetic data from a research group at the University of Washington, US, to support our study.
Does temperature change anything?
From our analysis, we found that temperatures in the north-east of Greenland were colder and less variable, while south-east temperatures fluctuated and were significantly warmer.
How climate is changing polar bear DNA
Over time, the DNA sequence can slowly change and evolve, but environmental stress, such as a warmer climate, can accelerate this process.
Overall, climate change is reshaping polar bear habitats, leading to genetic changes, with south-eastern bears evolving to survive these new terrains and diets.
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