🔗 Share this article Investigation Finds Arctic Bear DNA Changes May Help Adaptation to Rising Temperatures Experts have detected alterations in Arctic bear DNA that may help the animals acclimatize to hotter conditions. This research is believed to be the first instance where a meaningful association has been found between increasing heat and changing DNA in a free-ranging animal species. Global Warming Endangers Polar Bear Survival Climate breakdown is jeopardizing the future of polar bears. Projections show that two-thirds of them could vanish by 2050 as their snowy environment disappears and the weather becomes more extreme. “Genetic material is the instruction book inside every biological unit, instructing how an creature evolves and matures,” explained the lead researcher, Dr. Alice Godden. “Through analyzing these bears’ expressed genes to local climate data, we discovered that rising heat seem to be fueling a dramatic surge in the function of mobile genetic elements within the specific area polar bears’ DNA.” DNA Study Shows Important Adaptations Scientists analyzed biological samples taken from polar bears in separate zones of Greenland and contrasted “transposable elements”: compact, mobile sections of the genome that can influence how different genes operate. The research looked at these genes in correlation to climate conditions and the related shifts in DNA function. With environmental conditions and diets change due to changes in habitat and food supply driven by climate change, the DNA of the animals appear to be adjusting. The population of bears in the most temperate part of the region displayed greater changes than the populations to the north. Potential Evolutionary Response “This discovery is important because it shows, for the first time, that a distinct group of polar bears in the hottest part of Greenland are using ‘mobile genetic elements’ to rapidly modify their own DNA, which could be a desperate survival mechanism against disappearing sea ice,” commented Godden. Temperatures in north-east Greenland are less variable and more stable, while in the southern zone there is a significantly hotter and ice-reduced area, with significant weather swings. Genetic code in organisms mutate over time, but this process can be accelerated by environmental stress such as a quickly warming climate. Dietary Shifts and Genetic Hotspots There were some interesting DNA changes, such as in regions associated to energy storage, that might help polar bears survive when food is scarce. Animals in warmer regions had increased rough, plant-based diets in contrast to the lipid-rich, marine diets of Arctic bears, and the DNA of south-eastern bears seemed to be adapting to this new reality. Godden stated: “The research pinpointed several genetic hotspots where these mobile elements were highly active, with some situated in the protein-coding regions of the DNA, implying that the animals are experiencing swift, profound DNA modifications as they adjust to their melting icy environment.” Further Study and Broader Impact The following stage will be to study different polar bear populations, of which there are numerous around the world, to determine if comparable changes are occurring to their DNA. This investigation might help conserve the animals from dying out. However, the researchers noted that it was vital to stop temperature rises from accelerating by reducing the use of coal, oil, and gas. “We cannot be complacent, this presents some hope but does not imply that polar bears are at any diminished danger of extinction. It remains crucial to be doing all measures we can to reduce greenhouse gas output and mitigate temperature increases,” summarized Godden.
Experts have detected alterations in Arctic bear DNA that may help the animals acclimatize to hotter conditions. This research is believed to be the first instance where a meaningful association has been found between increasing heat and changing DNA in a free-ranging animal species. Global Warming Endangers Polar Bear Survival Climate breakdown is jeopardizing the future of polar bears. Projections show that two-thirds of them could vanish by 2050 as their snowy environment disappears and the weather becomes more extreme. “Genetic material is the instruction book inside every biological unit, instructing how an creature evolves and matures,” explained the lead researcher, Dr. Alice Godden. “Through analyzing these bears’ expressed genes to local climate data, we discovered that rising heat seem to be fueling a dramatic surge in the function of mobile genetic elements within the specific area polar bears’ DNA.” DNA Study Shows Important Adaptations Scientists analyzed biological samples taken from polar bears in separate zones of Greenland and contrasted “transposable elements”: compact, mobile sections of the genome that can influence how different genes operate. The research looked at these genes in correlation to climate conditions and the related shifts in DNA function. With environmental conditions and diets change due to changes in habitat and food supply driven by climate change, the DNA of the animals appear to be adjusting. The population of bears in the most temperate part of the region displayed greater changes than the populations to the north. Potential Evolutionary Response “This discovery is important because it shows, for the first time, that a distinct group of polar bears in the hottest part of Greenland are using ‘mobile genetic elements’ to rapidly modify their own DNA, which could be a desperate survival mechanism against disappearing sea ice,” commented Godden. Temperatures in north-east Greenland are less variable and more stable, while in the southern zone there is a significantly hotter and ice-reduced area, with significant weather swings. Genetic code in organisms mutate over time, but this process can be accelerated by environmental stress such as a quickly warming climate. Dietary Shifts and Genetic Hotspots There were some interesting DNA changes, such as in regions associated to energy storage, that might help polar bears survive when food is scarce. Animals in warmer regions had increased rough, plant-based diets in contrast to the lipid-rich, marine diets of Arctic bears, and the DNA of south-eastern bears seemed to be adapting to this new reality. Godden stated: “The research pinpointed several genetic hotspots where these mobile elements were highly active, with some situated in the protein-coding regions of the DNA, implying that the animals are experiencing swift, profound DNA modifications as they adjust to their melting icy environment.” Further Study and Broader Impact The following stage will be to study different polar bear populations, of which there are numerous around the world, to determine if comparable changes are occurring to their DNA. This investigation might help conserve the animals from dying out. However, the researchers noted that it was vital to stop temperature rises from accelerating by reducing the use of coal, oil, and gas. “We cannot be complacent, this presents some hope but does not imply that polar bears are at any diminished danger of extinction. It remains crucial to be doing all measures we can to reduce greenhouse gas output and mitigate temperature increases,” summarized Godden.