Quanome.

Gene library · Fitness

Muscle fiber type

rs1815739 · gene ACTN3 · category Fitness · Free in the Quanome app

Your DNA file reports your genotype at rs1815739 — a marker in the ACTN3 gene that studies link to muscle fiber type. Here's what each genotype is associated with:

GenotypeWhat it's associated with
CCTwo working ACTN3 copies — associated with power/sprint muscle performance.
CTMixed ACTN3 — a blend of power and endurance traits.
TTACTN3-deficient (very common) — associated with endurance over sprint power; not a health deficiency.

Educational only — not medical or diagnostic advice. A single marker is one of many factors; strand orientation varies between files. Always consult a qualified clinician about your health.

Want to read rs1815739 in your own data? The free DNA explorer checks it in your browser — nothing is uploaded. Or get the full picture in Quanome, which reads your whole genome on-device alongside your labs and Apple Health.

See all your genes in one place

Quanome reads your full DNA file on your device — traits, nutrition, fitness, and more — alongside your labs and Apple Health. Join the waitlist for early access.