To investigate associations of genetic factors and environmental factors with coronary artery disease (CAD), we collected medical reports, lifestyle details, and blood samples of 2113 individuals, and then used the polymerase chain reaction (PCR)-ligase detection reaction (LDR) to genotype the targeted 102 SNPs.
We adopted elastic net algorithm to build an association model that considered simultaneously genetic and lifestyle/clinical factors associated with CAD in Chinese Han population.
In this study, we developed an all covariates-based model to explain the risk of CAD, which incorporated 8 lifestyle/clinical factors and a gene-score variable calculated from 3 significant SNPs (rs671, rs6751537 and rs11641677), attaining an area under the curve (AUC) value of 0.71. It is found that, in terms of genetic variants, the AA genotype of rs671 in the additive (adjusted odds ratio (OR)=2.51, p=0.008) and recessive (adjusted OR=2.12, p=0.021) models, the GG genotype of rs6751537 in the additive (adjusted OR=3.36, p=0.001) and recessive (adjusted OR=3.47, p=0.001) models, and GG genotype of rs11641677 in additive model (adjusted OR=0.39, p=0.044) was associated with increased risk of CAD. In terms of lifestyle/clinical factors, the history of hypertension (unadjusted OR=2.37, p<0.001) and dyslipidemia (unadjusted OR=1.82, p=0.007), age (unadjusted OR=1.07, p<0.001) and waist circumference (unadjusted OR=1.02, p=0.05) would significantly increase the risk of CAD, while height (unadjusted OR=0.97, p=0.006) and regular intake of chicken (unadjusted OR=0.78, p=0.008) reduced the risk of CAD. A significantinteraction was foundbetween rs671 and dyslipidemia (the relative excess risk due to interaction (RERI) = 3.36, p=0.05).
In this study, we constructed an association mode and identified a set of SNPs and lifestyle/clinical risk factors of CAD in Chinese Han population. By considering both genetic and non-genetic risk factors, the built model may provide implications for CAD pathogenesis and clues for screening tool development in Chinese Han population.

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