🔗 Share this article Investigation Discovers Arctic Bear DNA Changes Might Help Adjustment to Rising Temperatures Scientists have detected changes in polar bear DNA that may assist the animals adapt to increasingly warm environments. This study is thought to be the initial instance where a notable association has been established between increasing heat and shifting DNA in a wild animal species. Environmental Crisis Endangers Polar Bear Future Environmental degradation is threatening the existence of Arctic bears. Projections show that a significant majority of them may vanish by 2050 as their frozen home retreats and the weather becomes warmer. “The genome is the blueprint inside every cell, directing how an life form grows and develops,” stated the study author, Dr. Alice Godden. “By comparing these animals’ functioning genes to local environmental information, we found that increasing temperatures seem to be fueling a significant increase in the function of transposable elements within the specific area bears’ DNA.” Genome Research Reveals Key Adaptations Researchers studied biological samples taken from polar bears in two regions of Greenland and evaluated “jumping genes”: small, mobile sections of the genome that can influence how different genes operate. The research examined these genes in connection to climate conditions and the corresponding changes in DNA function. With environmental conditions and diets change due to alterations in habitat and prey driven by warming, the DNA of the bears seem to be evolving. The community of polar bears in the hottest part of the region exhibited greater changes than the communities farther north. Possible Adaptive Strategy “This discovery is crucial because it demonstrates, for the first time, that a particular group of Arctic bears in the hottest part of Greenland are employing ‘jumping genes’ to swiftly rewrite their own DNA, which might be a desperate coping method against disappearing Arctic ice,” noted Godden. The climate in the northern area are colder and less variable, while in the south-east there is a much warmer and less icy habitat, with significant climate variability. Genetic code in animals change over time, but this process can be hastened by external pressure such as a rapidly heating planet. Nutritional Changes and Active DNA Areas There were some interesting DNA alterations, such as in areas connected to energy storage, that could help polar bears survive when prey is unavailable. Bears in warmer regions had more rough, plant-based diets versus the fatty, seal-based nutrition of northern bears, and the DNA of south-eastern bears seemed to be adjusting to this change. Godden stated: “We identified several active DNA areas where these jumping genes were particularly busy, with some located in the critical areas of the DNA, implying that the bears are undergoing fast, fundamental evolutionary shifts as they adjust to their vanishing icy environment.” Next Steps and Broader Impact The subsequent phase will be to look at additional subspecies, of which there are twenty around the world, to observe if analogous changes are happening to their DNA. This research may help conserve the bears from disappearance. However, the researchers stressed that it was crucial to halt global warming from increasing by reducing the consumption of carbon-based fuels. “We must not relax, this provides some optimism but does not imply that Arctic bears are at any reduced threat of extinction. It is imperative to be doing all measures we can to decrease global carbon emissions and slow global warming,” summarized Godden.
Scientists have detected changes in polar bear DNA that may assist the animals adapt to increasingly warm environments. This study is thought to be the initial instance where a notable association has been established between increasing heat and shifting DNA in a wild animal species. Environmental Crisis Endangers Polar Bear Future Environmental degradation is threatening the existence of Arctic bears. Projections show that a significant majority of them may vanish by 2050 as their frozen home retreats and the weather becomes warmer. “The genome is the blueprint inside every cell, directing how an life form grows and develops,” stated the study author, Dr. Alice Godden. “By comparing these animals’ functioning genes to local environmental information, we found that increasing temperatures seem to be fueling a significant increase in the function of transposable elements within the specific area bears’ DNA.” Genome Research Reveals Key Adaptations Researchers studied biological samples taken from polar bears in two regions of Greenland and evaluated “jumping genes”: small, mobile sections of the genome that can influence how different genes operate. The research examined these genes in connection to climate conditions and the corresponding changes in DNA function. With environmental conditions and diets change due to alterations in habitat and prey driven by warming, the DNA of the bears seem to be evolving. The community of polar bears in the hottest part of the region exhibited greater changes than the communities farther north. Possible Adaptive Strategy “This discovery is crucial because it demonstrates, for the first time, that a particular group of Arctic bears in the hottest part of Greenland are employing ‘jumping genes’ to swiftly rewrite their own DNA, which might be a desperate coping method against disappearing Arctic ice,” noted Godden. The climate in the northern area are colder and less variable, while in the south-east there is a much warmer and less icy habitat, with significant climate variability. Genetic code in animals change over time, but this process can be hastened by external pressure such as a rapidly heating planet. Nutritional Changes and Active DNA Areas There were some interesting DNA alterations, such as in areas connected to energy storage, that could help polar bears survive when prey is unavailable. Bears in warmer regions had more rough, plant-based diets versus the fatty, seal-based nutrition of northern bears, and the DNA of south-eastern bears seemed to be adjusting to this change. Godden stated: “We identified several active DNA areas where these jumping genes were particularly busy, with some located in the critical areas of the DNA, implying that the bears are undergoing fast, fundamental evolutionary shifts as they adjust to their vanishing icy environment.” Next Steps and Broader Impact The subsequent phase will be to look at additional subspecies, of which there are twenty around the world, to observe if analogous changes are happening to their DNA. This research may help conserve the bears from disappearance. However, the researchers stressed that it was crucial to halt global warming from increasing by reducing the consumption of carbon-based fuels. “We must not relax, this provides some optimism but does not imply that Arctic bears are at any reduced threat of extinction. It is imperative to be doing all measures we can to decrease global carbon emissions and slow global warming,” summarized Godden.