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Background  Atherosclerosis is the primary cause of coronary heart disease (CHD), preceding the onset of cardiovascular disease by decades in most cases. Here we examine the association between single nucleotide polymorphisms (SNPs) integrated on Metabochip and coronary artery calcification (CAC), a valid risk factor for CHD, in an unselected, population-based German cohort.    Methods  The Metabochip is a custom iSELECT array containing >195,000 SNPs that was designed to support large-scale follow-up of putative associations for metabolic and cardiovascular-associated traits. We used generalized linear regression models to explore the impact of Metabochip SNPs on quantitative CAC in 4,329 participants.    Results  The 9p21 variant, rs1537373, was most strongly associated (Beta = 0.30; 95% confidence interval (CI) = 0.21-0.39; p = 4.05x10 -11 ) with quantitative CAC. The second strongest association with CAC was with rs9349379 in the phosphatase and actin regulator 1 gene,  PHACTR1 , (Beta = 0.30; 95% CI = 0.22-0.40; p = 4.67x10 -11 ). Both SNPs remained nominally significant in dichotomized analyses for the presence of any CAC (odds ratio rs1537373  (OR) = 1.19; 95% CI = 1.07-1.31; p = 0.001 and OR rs9349379  = 1.26; 95% CI = 1.14-1.40); p = 1.5x10 -5 ). Fine mapping of the 9p21 and  PHACTR1  gene region revealed several other SNPs that were strongly associated with CAC.    Conclusion  We demonstrate that SNPs near 9p21 and in  PHACTR1  that have previously been shown to be associated with CHD are strongly associated with CAC in the Heinz Nixdorf Recall Study cohort. Our findings suggest that the 9p21 and 6q24 loci might be involved in cardiac outcome via promoting development of atherosclerosis in the coronary arteries.

Risk loci for coronary artery calcification replicated at 9p21 and 6q24 in the Heinz Nixdorf Recall Study