A gene for speed: the emerging role of alpha-actinin-3 in muscle metabolism.
A common polymorphism (R577X) in the ACTN3 gene results in complete deficiency of alpha-actinin-3 protein in approximately 16% of humans worldwide. The presence of alpha-actinin-3 protein is associated with improved sprint/power performance in athletes and the general population. Despite this, there is evidence that the null genotype XX has been acted on by recent positive selection, likely due to its emerging role in the regulation of muscle metabolism. alpha-Actinin-3 deficiency reduces the activity of glycogen phosphorylase and results in a fundamental shift toward more oxidative pathways of energy utilization.
Berman
Yemima
Y
Institute for Neuroscience and Muscle Research, The Children's Hospital at Westmead, Westmead, Australia.
North
Kathryn N
KN
D000185:Actinin / Q000172:deficiency / Q000235:genetics* / Q000502:physiology*; D000818:Animals; D054874:Athletic Performance; D006003:Glycogen / Q000378:metabolism; D006019:Glycolysis / Q000502:physiology; D006801:Humans; D051379:Mice; D018345:Mice, Knockout; D008931:Mitochondria, Muscle / Q000201:enzymology; D053580:Muscle Strength; D018482:Muscle, Skeletal / Q000033:anatomy & histology / Q000378:metabolism*; D010807:Physical Endurance / Q000235:genetics / Q000502:physiology
C118456:ACTN3 protein, human; C525925:Actn3 protein, mouse; D000185:Actinin; D006003:Glycogen