Investigation Finds Arctic Bear DNA Modifications May Assist Adjustment to Climate Warming

Researchers have identified modifications in polar bear DNA that may help the animals adapt to increasingly warm climates. This research is considered to be the initial instance where a meaningful association has been identified between increasing heat and changing DNA in a wild animal species.

Environmental Crisis Puts at Risk Arctic Bear Survival

Environmental degradation is jeopardizing the survival of Arctic bears. Estimates show that two-thirds of them could be lost by 2050 as their icy habitat disappears and the weather becomes warmer.

“Genetic material is the blueprint inside every cell, directing how an creature grows and matures,” explained the study author, Dr. Alice Godden. “Through analyzing these animals’ active genes to local temperature records, we observed that increasing heat appear to be driving a dramatic surge in the behavior of jumping genes within the south-east Greenland polar bears’ DNA.”

Genome Research Uncovers Important Changes

The team examined blood samples taken from polar bears in two regions of Greenland and compared “mobile genetic elements”: tiny, movable segments of the genetic code that can influence how different genes work. The research looked at these genetic markers in correlation to temperatures and the related shifts in genetic activity.

As local climates and food sources change due to transformations in environment and food supply forced by warming, the DNA of the bears seem to be adapting. The population of bears in the hottest part of the area exhibited increased changes than the communities farther north.

Possible Evolutionary Response

“This result is crucial because it shows, for the first time, that a unique group of polar bears in the warmest part of Greenland are using ‘mobile genetic elements’ to swiftly modify their own DNA, which may be a desperate coping method against melting ice sheets,” noted Godden.

The climate in north-east Greenland are less variable and more stable, while in the south-east there is a significantly hotter and ice-reduced environment, with significant temperature fluctuations.

Genetic code in animals mutate over time, but this mechanism can be hastened by environmental stress such as a quickly warming environment.

Nutritional Changes and Genetic Hotspots

The study noted some interesting DNA alterations, such as in areas associated to fat processing, that might assist Arctic bears cope when food is scarce. Bears in hotter areas had more terrestrial food intake in contrast to the lipid-rich, marine diets of northern bears, and the DNA of south-eastern bears appeared to be adapting to this change.

Godden stated: “Scientists found several active DNA areas where these jumping genes were very dynamic, with some situated in the functional gene sections of the DNA, indicating that the animals are experiencing fast, profound DNA modifications as they respond to their vanishing icy environment.”

Further Study and Broader Impact

The subsequent phase will be to look at different polar bear populations, of which there are twenty globally, to see if comparable genetic shifts are occurring to their DNA.

This investigation may aid protect the bears from extinction. However, the researchers stressed that it was essential to halt temperature rises from escalating by cutting the burning of coal, oil, and gas.

“We cannot be complacent, this provides some optimism but is not a sign that Arctic bears are at any diminished risk of extinction. It is imperative to be doing every action we can to reduce global carbon emissions and slow climate change,” summarized Godden.