alpha-actinin-3

ACTN3

A gene on chromosome 11q13-q14 that encodes an actin-binding bundling protein expressed only in skeletal muscle, which localises to the Z-disc and analogous dense bodies, where it helps to anchor the myofibrillar actin filaments.

alpha-actinin-3

ACTN3, a group of genes one of which, the R allele, codes for the fast-acting muscle protein actinin. The X allele does not produce this protein. Interestingly, 95 percent of champion sprinters have at least one copy of the R allele and 50 percent have two. In controls, 72 percent have one R allele and only 30 percent have two.
Mentioned in ?
References in periodicals archive ?
2008) A gene for speed: contractile properties of isolated whole EDL muscle from an alpha-actinin-3 knockout mouse.
2007) Alpha-actinin-3 (ACTN3) R577X polymorphism influences knee extensor peak power response to strength training in older men and women.
2008) An Actn3 knockout mouse provides mechanistic insights into the association between alpha-actinin-3 deficiency and human athletic performance.
Australian researchers identified two versions of a gene called alpha-actinin-3,or ACTN3,New Scientist magazine reported.
Team leader Kathryn North,from the Institute of Neuromuscular Research at the Children's Hospital at Westmead, Sydney, said: ``I hypothesise that absence of alpha-actinin-3 means that an individual's muscles are more `slow' in character and better suited for endurance activities.