{"id":119706,"date":"2021-02-17T19:23:51","date_gmt":"2021-02-18T03:23:51","guid":{"rendered":"https:\/\/lifeboat.com\/blog\/2021\/02\/20-of-people-have-a-genetic-mutation-that-provides-superior-resilience-to-cold"},"modified":"2021-02-17T19:23:51","modified_gmt":"2021-02-18T03:23:51","slug":"20-of-people-have-a-genetic-mutation-that-provides-superior-resilience-to-cold","status":"publish","type":"post","link":"https:\/\/lifeboat.com\/blog\/2021\/02\/20-of-people-have-a-genetic-mutation-that-provides-superior-resilience-to-cold","title":{"rendered":"20% of People Have a Genetic Mutation That Provides Superior Resilience to Cold"},"content":{"rendered":"<p><a class=\"aligncenter blog-photo\" href=\"https:\/\/lifeboat.com\/blog.images\/20-of-people-have-a-genetic-mutation-that-provides-superior-resilience-to-cold2.jpg\"><\/a><\/p>\n<p>Almost one in five people lack the protein \u03b1-aktinin-3 in their muscle fiber. Researchers at Karolinska Institutet in Sweden now show that more of the skeletal muscle of these individuals comprises slow-twitch muscle fibers, which are more durable and energy-efficient and provide better tolerance to low temperatures than fast-twitch muscle fibers. The results are published in the scientific journal The <em>American Journal of Human Genetics<\/em>.<\/p>\n<p>Skeletal muscle comprises fast-twitch (white) fibers that fatigue quickly and slow-twitch (red) fibers that are more resistant to fatigue. The protein \u03b1-aktinin-3, which is found only in fast-twitch fibers, is absent in almost 20 percent of people \u2013 almost 1.5 billion individuals \u2013 due to a mutation in the gene that codes for it. In evolutionary terms, the presence of the mutated gene increased when humans migrated from Africa to the colder climates of central and northern Europe.<\/p>\n<p>\u201cThis suggests that people lacking \u03b1-aktinin-3 are better at keeping warm and, energy-wise, at enduring a tougher climate, but there hasn\u2019t been any direct experimental evidence for this before,\u201d says H\u00e5kan Westerblad, professor of cellular muscle physiology at the Department of Physiology and Pharmacology, Karolinska Institutet. \u201cWe can now show that the loss of this protein gives a greater resilience to cold and we\u2019ve also found a possible mechanism for this.\u201d<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Almost one in five people lack the protein \u03b1-aktinin-3 in their muscle fiber. Researchers at Karolinska Institutet in Sweden now show that more of the skeletal muscle of these individuals comprises slow-twitch muscle fibers, which are more durable and energy-efficient and provide better tolerance to low temperatures than fast-twitch muscle fibers. The results are published [\u2026]<\/p>\n","protected":false},"author":513,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[493,412],"tags":[],"class_list":["post-119706","post","type-post","status-publish","format-standard","hentry","category-climatology","category-genetics"],"_links":{"self":[{"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/posts\/119706","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/users\/513"}],"replies":[{"embeddable":true,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/comments?post=119706"}],"version-history":[{"count":0,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/posts\/119706\/revisions"}],"wp:attachment":[{"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/media?parent=119706"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/categories?post=119706"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/tags?post=119706"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}