Expressive

rs12189362 (GRIA1): Sudden Cardiac Arrest Risk

Key takeaways

  • rs12189362 in the GRIA1 region was one of 7 novel gene-level candidates for sudden cardiac arrest in a pilot genome-wide association study.
  • The association passed Bonferroni correction (p < 1.30 x 10^-7) across 338,328 tested genetic variants.
  • The study was very small (89 cardiac arrest cases, 520 controls) and the authors called for independent replication before results can be confirmed.
  • All participants were Caucasian non-Hispanic, which limits how broadly these results may apply to other groups.

Key takeaways

  • rs12189362, located in the GRIA1 gene region, was one of 7 novel gene-level candidates for sudden cardiac arrest identified in a pilot genome-wide association study of coronary artery disease patients.
  • The association passed a Bonferroni-corrected significance threshold (p < 1.30 x 10^-7) across 338,328 tested genetic variants.
  • The study was small, with only 89 cardiac arrest cases and 520 controls, and the authors called for independent replication before the findings can be considered confirmed.
  • All participants were Caucasian non-Hispanic, limiting how broadly these findings may apply to other populations.

What the research says A pilot genome-wide association study (GWAS - a study that scans across the entire genome for variants associated with a trait) compared 89 patients with coronary artery disease (CAD) who experienced sudden cardiac arrest (SCA) due to ventricular tachycardia or ventricular fibrillation against 520 healthy controls, testing 338,328 tagging single nucleotide polymorphisms (SNPs - single-letter DNA variants). Among 14 SNPs that reached Bonferroni-corrected genome-wide significance (all p < 1.30 x 10^-7), one SNP in GRIA1 was identified alongside variants in six other genes: ACYP2, AP1G2, ESR1, DGES2, KCTD1, and ZNF385B. The authors concluded that validation studies in independent cohorts and functional studies are required to confirm these associations.

Reported associations

  • Sudden cardiac arrest (ventricular tachycardia / ventricular fibrillation) in coronary artery disease: rs12189362 in the GRIA1 locus was associated with SCA among 89 CAD patients vs. 520 controls; the variant was among 14 that met the Bonferroni-corrected threshold of p < 1.30 x 10^-7, though a gene-specific odds ratio for this locus was not reported separately - an individual effect size was provided only for ESR1 (OR = 1.43, 95% CI: 1.277-1.596) among the novel findings.

Evidence quality This is a small pilot GWAS (89 cases, 520 controls, all Caucasian non-Hispanic) explicitly designed as a precursor to larger validation studies. The association for the GRIA1 locus met a Bonferroni-corrected threshold (p < 1.30 x 10^-7 accounting for 338,328 tested variants), which is a strict statistical bar, but no gene-specific effect size was reported for rs12189362. The authors noted that prior candidate gene studies for sudden cardiac arrest in this field yielded conflicting results, a pattern that motivated the GWAS approach used here. No independent replication cohort was included, and the authors explicitly stated that replication in independent cohorts and functional studies are required before these associations can be treated as confirmed. The small sample size, single-cohort design, and restriction to one ancestry group substantially limit the strength of this evidence.

Lifestyle considerations No lifestyle considerations on file for this variant.

Frequently asked questions

What is rs12189362?

rs12189362 is a single nucleotide polymorphism - a single-letter variation in the DNA sequence - located in the GRIA1 gene region. It was identified as a candidate risk variant for sudden cardiac arrest in a pilot genome-wide association study of patients with coronary artery disease.

Is rs12189362 linked to sudden cardiac arrest?

A pilot genome-wide association study found rs12189362 associated with sudden cardiac arrest in patients with coronary artery disease, passing a strict statistical significance threshold. However, the study included only 89 cases, and the authors stated that independent replication is needed before the finding can be confirmed.

How strong is the evidence connecting GRIA1 to heart rhythm problems?

The evidence is preliminary. The single published study is a small pilot genome-wide association study with 89 cardiac arrest cases, conducted exclusively in Caucasian non-Hispanic participants, with no replication cohort. The authors described it as a starting point requiring further validation in independent cohorts and functional studies.

What is sudden cardiac arrest?

Sudden cardiac arrest occurs when the heart abruptly stops pumping blood, usually due to a dangerous abnormal rhythm such as ventricular tachycardia or ventricular fibrillation. It is distinct from a heart attack, though it often occurs in people who already have coronary artery disease - the patient population in which rs12189362 was studied.

Has rs12189362 been studied in populations outside of European ancestry?

No. The published study included only Caucasian non-Hispanic participants, and the authors called for validation in independent cohorts, leaving the relevance of this variant to other ancestries unknown.