Research Finds Arctic Bear DNA Changes Could Aid Adjustment to Climate Warming

Experts have identified modifications in polar bear DNA that may assist the mammals acclimatize to warmer environments. This study is believed to be the first instance where a notable association has been found between increasing heat and evolving DNA in a wild mammal species.

Global Warming Threatens Polar Bear Survival

Climate breakdown is imperiling the existence of Arctic bears. Projections suggest that two-thirds of them could disappear by 2050 as their icy home disappears and the weather becomes more extreme.

“The genome is the guidebook inside every biological unit, guiding how an life form develops and functions,” explained the lead researcher, Dr. Alice Godden. “By comparing these animals’ active genes to area temperature records, we observed that rising temperatures seem to be fueling a significant surge in the behavior of jumping genes within the warmer Greenland region bears’ DNA.”

Genetic Analysis Shows Significant Changes

Scientists analyzed tissue samples taken from Arctic bears in separate zones of Greenland and compared “transposable elements”: compact, movable sections of the genome that can influence how various genes operate. The analysis looked at these genes in relation to temperatures and the corresponding shifts in gene expression.

With environmental conditions and food sources change due to changes in habitat and food supply driven by climate change, the genetics of the animals appear to be adjusting. The community of polar bears in the hottest part of the region exhibited greater modifications than the populations farther north.

Likely Survival Mechanism

“This discovery is important because it shows, for the first time, that a unique population of polar bears in the hottest part of Greenland are using ‘mobile genetic elements’ to quickly rewrite their own DNA, which could be a desperate coping method against melting Arctic ice,” noted Godden.

Temperatures in the northern area are colder and less variable, while in the southern zone there is a more temperate and ice-reduced area, with steep temperature fluctuations.

Genetic code in organisms evolve over time, but this mechanism can be hastened by environmental stress such as a rapidly heating climate.

Nutritional Changes and Genetic Hotspots

Scientists observed some interesting DNA changes, such as in regions associated to lipid metabolism, that might help Arctic bears cope when food is scarce. Bears in hotter areas had more rough, plant-based diets in contrast to the lipid-rich, marine nutrition of northern bears, and the DNA of south-eastern bears appeared to be adapting to this change.

Godden elaborated: “Scientists found several key genomic regions where these mobile elements were highly active, with some found in the critical areas of the genome, indicating that the animals are subject to fast, fundamental genetic changes as they adjust to their vanishing Arctic home.”

Next Steps and Conservation Implications

The next step will be to study different polar bear populations, of which there are 20 around the world, to observe if similar changes are occurring to their DNA.

This research may aid safeguard the animals from dying out. However, the experts emphasized that it was essential to halt global warming from accelerating by reducing the use of coal, oil, and gas.

“Caution is still required, this offers some promise but does not imply that Arctic bears are at any reduced danger of disappearance. It is imperative to be doing every action we can to lower pollution and decelerate temperature increases,” summarized Godden.