🔗 Share this article Research Finds Polar Bear DNA Changes Could Aid Adaptation to Global Heating Experts have identified changes in Arctic bear DNA that might assist the animals adapt to warmer environments. This investigation is considered to be the first instance where a meaningful link has been found between rising temperatures and shifting DNA in a wild mammal species. Global Warming Puts at Risk Arctic Bear Future Climate breakdown is jeopardizing the existence of Arctic bears. Forecasts indicate that two-thirds of them might be lost by 2050 as their frozen environment retreats and the weather becomes more extreme. “The genome is the instruction book within every biological unit, guiding how an organism develops and matures,” explained the lead researcher, Dr. Alice Godden. “Through analyzing these bears’ active genes to regional temperature records, we discovered that escalating temperatures appear to be causing a significant increase in the activity of jumping genes within the south-east Greenland polar bears’ DNA.” Genetic Analysis Uncovers Key Adaptations The team studied tissue samples taken from polar bears in separate zones of Greenland and compared “transposable elements”: small, roving pieces of the genetic code that can alter how various genes function. The research examined these genetic markers in correlation to temperatures and the corresponding shifts in gene expression. As local climates and food sources shift due to changes in habitat and food supply forced by global heating, the genetic makeup of the bears seem to be evolving. The population of bears in the hottest part of the country displayed more changes than the groups farther north. Possible Survival Mechanism “This result is important because it demonstrates, for the initial occasion, that a distinct group of polar bears in the warmest part of Greenland are using ‘jumping genes’ to rapidly alter their own DNA, which might be a critical survival mechanism against disappearing ice sheets,” noted Godden. Temperatures in the northern area are more frigid and less variable, while in the south-east there is a more temperate and more open water area, with sharp temperature fluctuations. Genetic code in species mutate over time, but this process can be hastened by external pressure such as a rapidly heating environment. Nutritional Changes and Key Genomic Regions The study noted some interesting DNA changes, such as in sections associated to fat processing, that could assist Arctic bears survive when food is scarce. Animals in warmer regions had increased rough, plant-based diets in contrast to the lipid-rich, marine nutrition of Arctic bears, and the DNA of these specific animals seemed to be adjusting to this new reality. Godden stated: “Scientists found several key genomic regions where these mobile elements were very dynamic, with some located in the critical areas of the genome, suggesting that the bears are subject to swift, significant evolutionary shifts as they respond to their melting icy environment.” Next Steps and Broader Impact The following stage will be to examine additional polar bear populations, of which there are twenty globally, to determine if analogous modifications are occurring to their DNA. This study could aid conserve the bears from extinction. However, the researchers stressed that it was vital to slow climate change from accelerating by lowering the use of carbon-based fuels. “We cannot be complacent, this offers some hope but does not mean that Arctic bears are at any diminished threat of extinction. It is imperative to be undertaking all measures we can to lower global carbon emissions and decelerate temperature increases,” summarized Godden.
Experts have identified changes in Arctic bear DNA that might assist the animals adapt to warmer environments. This investigation is considered to be the first instance where a meaningful link has been found between rising temperatures and shifting DNA in a wild mammal species. Global Warming Puts at Risk Arctic Bear Future Climate breakdown is jeopardizing the existence of Arctic bears. Forecasts indicate that two-thirds of them might be lost by 2050 as their frozen environment retreats and the weather becomes more extreme. “The genome is the instruction book within every biological unit, guiding how an organism develops and matures,” explained the lead researcher, Dr. Alice Godden. “Through analyzing these bears’ active genes to regional temperature records, we discovered that escalating temperatures appear to be causing a significant increase in the activity of jumping genes within the south-east Greenland polar bears’ DNA.” Genetic Analysis Uncovers Key Adaptations The team studied tissue samples taken from polar bears in separate zones of Greenland and compared “transposable elements”: small, roving pieces of the genetic code that can alter how various genes function. The research examined these genetic markers in correlation to temperatures and the corresponding shifts in gene expression. As local climates and food sources shift due to changes in habitat and food supply forced by global heating, the genetic makeup of the bears seem to be evolving. The population of bears in the hottest part of the country displayed more changes than the groups farther north. Possible Survival Mechanism “This result is important because it demonstrates, for the initial occasion, that a distinct group of polar bears in the warmest part of Greenland are using ‘jumping genes’ to rapidly alter their own DNA, which might be a critical survival mechanism against disappearing ice sheets,” noted Godden. Temperatures in the northern area are more frigid and less variable, while in the south-east there is a more temperate and more open water area, with sharp temperature fluctuations. Genetic code in species mutate over time, but this process can be hastened by external pressure such as a rapidly heating environment. Nutritional Changes and Key Genomic Regions The study noted some interesting DNA changes, such as in sections associated to fat processing, that could assist Arctic bears survive when food is scarce. Animals in warmer regions had increased rough, plant-based diets in contrast to the lipid-rich, marine nutrition of Arctic bears, and the DNA of these specific animals seemed to be adjusting to this new reality. Godden stated: “Scientists found several key genomic regions where these mobile elements were very dynamic, with some located in the critical areas of the genome, suggesting that the bears are subject to swift, significant evolutionary shifts as they respond to their melting icy environment.” Next Steps and Broader Impact The following stage will be to examine additional polar bear populations, of which there are twenty globally, to determine if analogous modifications are occurring to their DNA. This study could aid conserve the bears from extinction. However, the researchers stressed that it was vital to slow climate change from accelerating by lowering the use of carbon-based fuels. “We cannot be complacent, this offers some hope but does not mean that Arctic bears are at any diminished threat of extinction. It is imperative to be undertaking all measures we can to lower global carbon emissions and decelerate temperature increases,” summarized Godden.