Study Finds Polar Bear DNA Changes Might Assist Adaptation to Global Heating

Researchers have identified changes in Arctic bear DNA that might assist the creatures acclimatize to increasingly warm climates. This study is believed to be the first instance where a statistically significant association has been identified between increasing temperatures and changing DNA in a wild mammal species.

Climate Breakdown Endangers Polar Bear Existence

Environmental degradation is imperiling the existence of Arctic bears. Forecasts suggest that two-thirds of them could disappear by 2050 as their icy environment retreats and the climate becomes hotter.

“Genetic material is the guidebook within every biological unit, guiding how an organism evolves and matures,” explained the study author, Dr. Alice Godden. “Through analyzing these animals’ expressed genes to regional environmental information, we discovered that escalating heat seem to be fueling a substantial surge in the activity of mobile genetic elements within the south-east Greenland bears’ DNA.”

DNA Study Shows Important Modifications

Researchers examined biological samples taken from Arctic bears in separate zones of Greenland and evaluated “transposable elements”: tiny, mobile pieces of the genetic code that can affect how different genes work. The study examined these genetic markers in relation to temperatures and the corresponding shifts in genetic activity.

As local climates and diets change due to alterations in environment and food supply driven by warming, the genetic makeup of the bears seem to be adjusting. The population of bears in the warmest part of the region exhibited increased modifications than the groups in colder regions.

Potential Evolutionary Response

“This discovery is significant because it indicates, for the first instance, that a distinct population of polar bears in the warmest part of Greenland are using ‘mobile genetic elements’ to quickly modify their own DNA, which might be a critical adaptive strategy against disappearing ice sheets,” noted Godden.

Temperatures in north-east Greenland are less variable and less variable, while in the warmer region there is a more temperate and less icy habitat, with significant temperature fluctuations.

DNA sequences in animals evolve over time, but this process can be sped up by external pressure such as a quickly warming planet.

Nutritional Changes and Active DNA Areas

Scientists observed some notable DNA alterations, such as in sections associated to energy storage, that may aid Arctic bears cope when prey is unavailable. Bears in hotter areas had more terrestrial diets versus the blubber-focused nutrition of northern bears, and the DNA of south-eastern bears appeared to be evolving to this new reality.

Godden stated: “The research pinpointed several genetic hotspots where these jumping genes were particularly busy, with some situated in the critical areas of the genome, implying that the bears are experiencing fast, profound evolutionary shifts as they respond to their vanishing Arctic home.”

Further Study and Broader Impact

The next step will be to study additional subspecies, of which there are 20 globally, to determine if similar changes are occurring to their DNA.

This study could aid safeguard the bears from dying out. However, the experts emphasized that it was essential to slow climate change from accelerating by reducing the burning of coal, oil, and gas.

“We must not relax, this presents some optimism but does not imply that polar bears are at any reduced risk of extinction. It is imperative to be pursuing all measures we can to decrease global carbon emissions and decelerate climate change,” summarized Godden.