🔗 Share this article Research Finds Polar Bear DNA Variations Could Aid Adaptation to Climate Warming Researchers have observed alterations in polar bear DNA that could assist the creatures adapt to hotter environments. This research is thought to be the primary instance where a meaningful connection has been identified between rising heat and changing DNA in a wild mammal species. Environmental Crisis Puts at Risk Arctic Bear Survival Environmental degradation is imperiling the future of polar bears. Estimates indicate that a large portion of them could be lost by 2050 as their frozen home disappears and the weather becomes more extreme. “The genome is the guidebook inside every cell, instructing how an creature evolves and develops,” stated the lead researcher, Dr. Alice Godden. “Through analyzing these animals’ functioning genes to area environmental information, we observed that rising temperatures appear to be driving a substantial rise in the activity of transposable elements within the specific area bears’ DNA.” Genetic Analysis Uncovers Important Modifications Researchers examined biological samples taken from polar bears in different areas of Greenland and evaluated “transposable elements”: compact, movable sections of the genome that can alter how different genes work. The research looked at these genes in correlation to temperatures and the related variations in DNA function. With environmental conditions and nutrition shift due to alterations in environment and prey driven by climate change, the genetic makeup of the animals appear to be adjusting. The population of bears in the most temperate part of the region exhibited more genetic shifts than the communities farther north. Potential Survival Mechanism “This result is important because it demonstrates, for the initial occasion, that a unique population of polar bears in the hottest part of Greenland are using ‘jumping genes’ to rapidly rewrite their own DNA, which might be a desperate survival mechanism against melting Arctic ice,” commented Godden. Temperatures in the northern area are colder and more stable, while in the southern zone there is a much warmer and ice-reduced area, with steep weather swings. Genetic code in species evolve over time, but this mechanism can be sped up by environmental stress such as a changing climate. Food Source Variations and Active DNA Areas Scientists observed some intriguing DNA alterations, such as in sections associated to fat processing, that may assist Arctic bears survive when food is scarce. Bears in hotter areas had increased fibrous, vegetarian food intake versus the blubber-focused nutrition of northern bears, and the DNA of these specific animals appeared to be evolving to this shift. Godden elaborated: “Scientists found several active DNA areas where these mobile elements were particularly busy, with some located in the critical areas of the DNA, implying that the bears are subject to rapid, profound genetic changes as they respond to their disappearing Arctic home.” Next Steps and Broader Impact The next step will be to examine additional Arctic bear groups, of which there are twenty globally, to see if similar genetic shifts are happening to their DNA. This study might assist conserve the animals from dying out. However, the researchers noted that it was essential to halt climate change from accelerating by cutting the consumption of coal, oil, and gas. “We must not relax, this presents some promise but does not mean that polar bears are at any less threat of extinction. We still need to be doing everything we can to reduce greenhouse gas output and decelerate climate change,” summarized Godden.
Researchers have observed alterations in polar bear DNA that could assist the creatures adapt to hotter environments. This research is thought to be the primary instance where a meaningful connection has been identified between rising heat and changing DNA in a wild mammal species. Environmental Crisis Puts at Risk Arctic Bear Survival Environmental degradation is imperiling the future of polar bears. Estimates indicate that a large portion of them could be lost by 2050 as their frozen home disappears and the weather becomes more extreme. “The genome is the guidebook inside every cell, instructing how an creature evolves and develops,” stated the lead researcher, Dr. Alice Godden. “Through analyzing these animals’ functioning genes to area environmental information, we observed that rising temperatures appear to be driving a substantial rise in the activity of transposable elements within the specific area bears’ DNA.” Genetic Analysis Uncovers Important Modifications Researchers examined biological samples taken from polar bears in different areas of Greenland and evaluated “transposable elements”: compact, movable sections of the genome that can alter how different genes work. The research looked at these genes in correlation to temperatures and the related variations in DNA function. With environmental conditions and nutrition shift due to alterations in environment and prey driven by climate change, the genetic makeup of the animals appear to be adjusting. The population of bears in the most temperate part of the region exhibited more genetic shifts than the communities farther north. Potential Survival Mechanism “This result is important because it demonstrates, for the initial occasion, that a unique population of polar bears in the hottest part of Greenland are using ‘jumping genes’ to rapidly rewrite their own DNA, which might be a desperate survival mechanism against melting Arctic ice,” commented Godden. Temperatures in the northern area are colder and more stable, while in the southern zone there is a much warmer and ice-reduced area, with steep weather swings. Genetic code in species evolve over time, but this mechanism can be sped up by environmental stress such as a changing climate. Food Source Variations and Active DNA Areas Scientists observed some intriguing DNA alterations, such as in sections associated to fat processing, that may assist Arctic bears survive when food is scarce. Bears in hotter areas had increased fibrous, vegetarian food intake versus the blubber-focused nutrition of northern bears, and the DNA of these specific animals appeared to be evolving to this shift. Godden elaborated: “Scientists found several active DNA areas where these mobile elements were particularly busy, with some located in the critical areas of the DNA, implying that the bears are subject to rapid, profound genetic changes as they respond to their disappearing Arctic home.” Next Steps and Broader Impact The next step will be to examine additional Arctic bear groups, of which there are twenty globally, to see if similar genetic shifts are happening to their DNA. This study might assist conserve the animals from dying out. However, the researchers noted that it was essential to halt climate change from accelerating by cutting the consumption of coal, oil, and gas. “We must not relax, this presents some promise but does not mean that polar bears are at any less threat of extinction. We still need to be doing everything we can to reduce greenhouse gas output and decelerate climate change,” summarized Godden.