Atrial fibrillation risk (4q25)

The 4q25 region near the PITX2 gene is the strongest common genetic signal for atrial fibrillation, an irregular and often rapid heartbeat that can raise stroke risk. The effect is real, but it is one of several factors alongside age and blood pressure.

Possible results

No 4q25 AF variant. You don't carry the 4q25 atrial-fibrillation variant, so as far as this strongest common heart-rhythm gene goes, your risk is at the baseline. Age, blood pressure and overall heart health still matter most.

Higher AF risk. You carry one copy of the 4q25 variant linked to atrial fibrillation (an irregular heartbeat). It raises your risk noticeably for a single common variant, though most carriers never develop it. Worth knowing if you ever feel palpitations, and keeping blood pressure in check helps.

High AF risk. You have two copies of the 4q25 atrial-fibrillation variant, which raises your risk further. This is a tendency, not a certainty: many people with it never develop an irregular heartbeat. If you notice palpitations or have other heart risk factors, it's worth mentioning to a doctor.

Evidence & sources

Across global populations, about 4% of people carry two copies of this variant, and about 67% carry none.

This variant appears in 2 published genetic studies: PubMed 17603472 · PubMed 19597491.

Related

Age-related macular degeneration · APOE type (Alzheimer's & cholesterol) · Autoimmune risk (PTPN22 R620W) · Diastolic blood pressure · Longevity-associated variant (FOXO3) · Rheumatoid arthritis · Type 2 diabetes protection (PPARG Pro12Ala)