How are ACTN3 and Wechseljahre related?

The relationship between ACTN3 and menopause (Wechseljahre) is not scientifically established. ACTN3 encodes α-actinin-3, a protein expressed in fast-twitch muscle fibers. A common loss-of-function variant (R577X) is linked to reduced sprint and power performance. Menopause is driven by declining estrogen levels, leading to symptoms like hot flashes, sleep disturbances, and loss of muscle mass (sarcopenia). There is no direct genetic link between ACTN3 and menopause onset or severity. Indirectly, ACTN3 genotype might influence muscle maintenance during the menopausal transition, but this remains speculative without robust evidence. Evidence grade: unclear/mechanistic. Consumer DNA tests reporting ACTN3 should not be used to assess menopause-related issues. For menopause, clinical hormone testing (estradiol, FSH) and symptom evaluation are appropriate.