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Ideas, Inventions And Innovations : Fast Twitch, Slow Twitch; 1 in 5 People Have Mutant Gene To Better Tolerate Cold Temperatures

Ideas, Inventions And Innovations Fast Twitch, Slow Twitch; 1 in 5 People Have Mutant Gene To Better Tolerate Cold Temperatures Almost one in five people lacks the protein α-actinin-3 in their muscle fibre. Researchers at Karolinska Institutet now show that more of the skeletal muscle of these individuals comprises slow-twitch muscle fibres, which are more durable and energy-efficient and provide better tolerance to low temperatures than fast-twitch muscle fibres. The results are published in The American Journal of Human Genetics. Photo: Getty Images Skeletal muscle comprises fast-twitch (white) fibres that fatigue quickly and slow-twitch (red) fibres that are more resistant to fatigue. The protein α-actinin-3, which is found only in fast-twitch fibres, is absent in almost 20 per cent of people – almost 1.5 billion individuals – 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 Af

One in five has a mutation that provides superior resilience to cold

One in five has a mutation that provides superior resilience to cold
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One in five has a mutation that provides superior resilience to cold

One in five has a mutation that provides superior resilience to cold
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