Background A polymorphism consisting of a C825T substitution in the G protein β3 subunit gene (GNB3) has been associated with enhanced human atrial inward r ectifier potassium currents regarding the TT genotype. Ther...
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Background A polymorphism consisting of a C825T substitution in the G protein β3 subunit gene (GNB3) has been associated with enhanced human atrial inward r ectifier potassium currents regarding the TT genotype. Therefore, we investigate d a possible impact of the GNB3 C825T polymorphismon atrial fibrillation in an a ssociation study. Methods Two hundred ninety one consecutive patients admitted to our center with atrial fibrillation (age, 58±10 years) and 292 consecutive c ontrol patients without atrial tachyarrhythmias (59±11 years) were genotyped fo r the C825T polymorphism. Patients with coronary heart disease, valvular heart d isease, or cardiomyopathy were excluded from the study. Both patient groups had a similar incidence of cardiovascular risk factors (hypertension, hypercholester olemia, body mass index). Results The prevalence of the GNB3 TT genotype was sig nificantly lower in patients with atrial fibrillation(5.8%) than in the control group(12.0%); however, no significant differences in the frequencies of the CT and CC genotypes were found. The TT genotype was associated with a 54%decrease in the adjusted risk (OR from a multivariant model, 0.46; 95%CI, 0.24 to 0.87; P=.02) for the occurrence of atrial fibrillation. Conclusions The current study suggests an association between the GNB3 TT genotype and a reduced risk for the occurrence of atrial fibrillation.
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