ACTN3 (Actinin Alpha 3)

ACTN3 (Actinin Alpha 3) is a gene that produces a protein found in fast-twitch muscle fibers, which are responsible for quick, powerful movements like sprinting or weightlifting. This gene influences muscle performance; some people have a version that helps generate more explosive strength, while others may lack it, affecting their muscle function. Variations in ACTN3 are associated with differences in athletic ability, particularly in power and speed activities. It serves as a genetic marker for muscle type composition, but environmental factors and training also play crucial roles in athletic performance.