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:
| Genotype | What it's associated with |
|---|---|
| CC | Two working ACTN3 copies — associated with power/sprint muscle performance. |
| CT | Mixed ACTN3 — a blend of power and endurance traits. |
| TT | ACTN3-deficient (very common) — associated with endurance over sprint power; not a health deficiency. |
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.
