Polymorphisms on chromosome 9p21 confer a risk for acute coronary syndrome in a Chinese Han population.

BACKGROUND

Genome-wide association studies have identified 2 single-nucleotide polymorphisms (SNPs) on chromosome arm 9p21, rs10757278, and rs2383207 that confer susceptibility to myocardial infarction. However, these data are mostly from Italian, American Caucasian, South Korean, and Japanese cohorts. This study is the first to investigate whether 6 SNPs (rs10757277, rs10757278, rs10757279, rs1333049, rs1333047, and rs10811656) are associated with acute coronary syndrome (ACS) in a Chinese Han population.

METHODS

We performed a case-control analysis in 359 patients with ACS diagnosed by coronary angiography and 398 non-ACS controls of Han background between April 2007 and January 2008 to determine whether these 6 SNPs were associated with ACS. Exon fragments were genotyped by polymerase chain reaction-restriction fragment length polymorphism.

RESULTS

After we adjusted for clinical parameters, we found the rs10757278 GG genotype to be associated with a significantly elevated risk of ACS (odds ratio [OR], 1.91; 95% confidence interval [CI], 1.35-2.68; P = 0.00035), the rs10811656 T allele to be associated with a higher risk of ACS (OR, 1.67; 95% CI, 1.26-2.23; P = 0.0016) than the CC genotype, and the rs1333047 TT genotype also to be associated with a higher risk of ACS (OR, 1.57; 95% CI, 1.15-2.06; P = 0.0052) than the CC and CT genotypes. After 14.2 ± 4.5 months of follow-up, the end-point data were obtained: death (cardiac and noncardiac), nonfatal myocardial infarction, and recurrent angina leading to repeated coronary angiography. We found that the rs10757278 GG genotype was significantly associated with recurrent angina compared with the AA and AG genotypes (P = 0.013).

CONCLUSIONS

Polymorphisms on 9p21 were associated with ACS in a Chinese Han population. The rs10757278 GG genotype was further associated with adverse cardiac outcomes after ACS.