GRK5 Polymorphisms and Postoperative Atrial Fibrillation following Coronary Artery Bypass Graft Surgery

Area of Science:

• Cardiovascular Genetics
• Surgical Complications
• Pharmacogenomics

Background:

• Postoperative atrial fibrillation (POAF) is a frequent complication following coronary artery bypass grafting (CABG).
• Previous genetic studies on POAF susceptibility after CABG have been limited, particularly in Asian populations.
• Identifying genetic risk factors is crucial for predicting and preventing POAF.

Purpose of the Study:

• To systematically evaluate previously identified genetic loci associated with POAF susceptibility after CABG.
• To investigate the association of genetic variations in the GRK5 gene with POAF risk in a Chinese population undergoing CABG.
• To validate genetic findings in a large, independently collected cohort.

Main Methods:

• A two-stage, population-based case-cohort study design was employed.
• A discovery cohort (1,348 patients) identified nine independent loci, with six significant single nucleotide polymorphisms (SNPs) selected for validation.
• A validation cohort (2,000 patients) assessed the association of selected SNPs with POAF risk after adjusting for clinical predictors.

Main Results:

• Two variants in the GRK5 gene (rs4752292 and rs11198893) were significantly replicated in the validation cohort.
• Each additional copy of the minor allele for rs4752292 increased POAF risk (OR=1.32, P=5.82 × 10⁻⁵).
• Each additional copy of the minor allele for rs11198893 increased POAF risk (OR=1.47, P=1.16 × 10⁻⁷).

Conclusions:

• Genetic variations within the GRK5 gene are independently associated with an increased risk of POAF in Asian patients undergoing CABG.
• These findings highlight the role of GRK5 in POAF susceptibility in this population.
• The study provides valuable genetic insights for POAF risk stratification in Asian patients undergoing cardiac surgery.