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Calcium has a pivotal role in biological functions, and serum calcium levels have been associated with numerous disorders of bone and mineral metabolism, as well as with cardiovascular mortality. Here we report results from a genome-wide association study of serum calcium, integrating data from four independent cohorts including a total of 12,865 individuals of European and Indian Asian descent. Our meta-analysis shows that serum calcium is associated with SNPs in or near the calcium-sensing receptor ( CASR ) gene on 3q13. The top hit with a p-value of 6.3×10 -37  is rs1801725, a missense variant, explaining 1.26% of the variance in serum calcium. This SNP had the strongest association in individuals of European descent, while for individuals of Indian Asian descent the top hit was rs17251221 (p = 1.1×10 -21 ), a SNP in strong linkage disequilibrium with rs1801725. The strongest locus in  CASR  was shown to replicate in an independent Icelandic cohort of 4,126 individuals (p = 1.02×10 -4) . This genome-wide meta-analysis shows that common  CASR  variants modulate serum calcium levels in the adult general population, which confirms previous results in some candidate gene studies of the  CASR  locus. This study highlights the key role of  CASR  in calcium regulation.

Genome-Wide Meta-Analysis for Serum Calcium Identifies Significantly Associated SNPs near the Calcium-Sensing Receptor (CASR) Gene