Myths vs facts: ACTN3 and Fruchtbarkeit

ACTN3 is a gene primarily known for its role in muscle contraction – it encodes α-actinin-3, a protein found in fast-twitch muscle fibers. A common variant (R577X) results in a loss of functional protein. About 18 % of Europeans are homozygous for the null variant (XX), which is associated with reduced sprint and power performance. However, there is no robust scientific evidence linking ACTN3 to fertility. Claims that ACTN3 affects fertility are myths, likely stemming from misinterpretations or over-extrapolation of sports genetics. Neither clinical practice nor research considers ACTN3 a relevant factor for male or female fertility. The evidence is clear: ACTN3 is a performance gene, not a fertility gene. Consumers should not be misled by DNA tests that suggest such connections.