Is the GUCY1A3 rs7692387 GG genotype linked to reduced nitric oxide signaling and higher coronary artery disease risk?

The GUCY1A3 rs7692387 variant links a modest inherited coronary-artery-disease (CAD) risk signal to a biologically coherent defect in nitric-oxide (NO) signaling. For the stated GG genotype, the overall evidence supports both attenuated NO–soluble guanylate cyclase (sGC)–cGMP activity and increased CAD susceptibility, with moderate confidence.

Clinical association

• Predominantly European-ancestry genome-wide association data identify the G allele as CAD risk-increasing, with a combined per-allele odds ratio of 1.13 (P=2.65×10⁻¹¹) after replication evidence of OR 1.06.
• European cohort findings report greater cardiovascular risk in GG homozygotes than in A-allele carriers. This is a modest susceptibility effect, not a deterministic cause of CAD or a standalone individual risk-prediction test.
• Association is ancestry-qualified: a Southeast Asian multi-ethnic analysis was weaker and nonsignificant (OR 0.93, 95% CI 0.85–1.01).

Mechanistic evidence

• rs7692387 is an intronic regulatory locus in a DNase-sensitive region. Altered ZEB1 binding has been reported to reduce GUCY1A3 transcription, lowering expression of the sGC α1 subunit.
• Lower sGC α1 abundance is accompanied by reduced NO-stimulated sGC activity and cGMP generation—the signaling pathway through which NO promotes vascular relaxation and restrains platelet activation.
• In platelets from risk-homozygous carriers, NO-donor exposure produced lower cGMP, weaker VASP phosphorylation, and less inhibition of aggregation. In vascular smooth-muscle cells, sGC-mediated suppression of cell migration was markedly reduced or absent. These findings provide plausible prothrombotic and pro-atherosclerotic links.

Bottom line

• The GG genotype is supported as a marker of blunted NO–sGC–cGMP signaling and modestly increased CAD susceptibility, especially in European-ancestry populations; its clinical meaning should be interpreted alongside established cardiovascular risk factors rather than in isolation.