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Pridružen/-a: 18.05. 2012, 20:47
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 Objavljeno: 21 Avg 2012 23:33 |
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Celoten naslov slednjega članka pojavljen v Nature Genetics n.°39, objavljen meseca oktobra 2007 je:
" Loss of ACTN3 gene function alters muscle metabolism and shows evidence of positive selection in humans "
Authors: Macarthur DG, Seto JT, Raftery JM, Quinlan KG, Huttley GA, Hook JW, Lemckert FA, Kee AJ, Edwards MR, Berman Y, Hardeman EC, Gunning PW, Easteal S, Yang N, North KN.
Abstract:
More than a billion humans worldwide are predicted to be completely deficient in the fast skeletal muscle fiber protein -actinin-3 owing to homozygosity for a premature stop codon polymorphism, R577X, in the ACTN3 gene. The R577X polymorphism is associated with elite athlete status and human muscle performance, suggesting that -actinin-3 deficiency influences the function of fast muscle fibers. Here we show that loss of -actinin-3 expression in a knockout mouse model results in a shift in muscle metabolism toward the more efficient aerobic pathway and an increase in intrinsic endurance performance. In addition, we demonstrate that the genomic region surrounding the 577X null allele shows low levels of genetic variation and recombination in individuals of European and East Asian descent, consistent with strong, recent positive selection. We propose that the 577X allele has been positively selected in some human populations owing to its effect on skeletal muscle metabolism.
Vir: http://www.nature.com/ng/journal/v39/n10/abs/ng2122.html |
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