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Many individual genetic risk loci have been associated with multiple common human diseases. However, the molecular basis of this pleiotropy often remains unclear. We present an integrative approach to reveal the molecular mechanism underlying the  PROCR  locus, associated with lower coronary artery disease (CAD) risk but higher venous thromboembolism (VTE) risk. We identify  PROCR -p.Ser219Gly as the likely causal variant at the locus and protein C as a causal factor. Using genetic analyses, human recall-by-genotype and in vitro experimentation, we demonstrate that  PROCR -219Gly increases plasma levels of (activated) protein C through endothelial protein C receptor (EPCR) ectodomain shedding in endothelial cells, attenuating leukocyte–endothelial cell adhesion and vascular inflammation. We also associate  PROCR -219Gly with an increased pro-thrombotic state via coagulation factor VII, a ligand of EPCR. Our study, which links  PROCR -219Gly to CAD through anti-inflammatory mechanisms and to VTE through pro-thrombotic mechanisms, provides a framework to reveal the mechanisms underlying similar cross-phenotype associations.

Elucidating mechanisms of genetic cross-disease associations at the PROCR vascular disease locus