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Coronary artery disease (CAD), which remains a leading cause of mortality worldwide [1], is caused by the development of atherosclerotic plaques in the arterial wall. Disease risk is influenced by environmental and lifestyle factors as well as having a significant genetic component. Over the last decade, genome-wide association studies (GWAS) have revealed the chromosomal loci contributing to increased CAD susceptibility, with the most recent investigation linking more than 300 genetic variants to disease [2]. A key characteristic of these loci is that most do not work through traditional CAD risk factors and current treatment targets such as plasma LDL-cholesterol levels or blood pressure. Importantly, for the majority of loci the underlying mechanism is unknown suggesting that our knowledge of disease pathogenesis is far from complete. CAD loci therefore offer a resource for the understanding of the molecular pathways and biological processes driving disease and potential identification of therapeutic targets. In a recent study [3] we investigated JCAD (pre-viously KIAA1462), a novel gene at the 10p11.23 CAD locus [4]. We demonstrated that JCAD mediates several CAD relevant endothelial cell phenotypes including proliferation, migration, apoptosis and adhesion mole-cule expression and inflammatory cell recruitment. We went on to show that JCAD interacts with the protein kinase LATS2 and functions as a new negative regula-tor of the Hippo signaling pathway to increase activity of the transcriptional effector YAP and downstream gene expression. We examined human gene expression data to show that CAD risk genotype associated with increased JCAD expression and relate JCAD expression modules to endothelial cell phenotype and YAP, supporting our findings that JCAD regulates endothelial cell function via YAP. RHOA, which encodes the Rho GTPase RhoA, a negative regulator of the Hippo pathway, has also been linked to CAD in a recent GWAS [2]. RhoA promotes YAP activity in response to various stimuli including cell confluency, mechanotransduction and G-protein coupled receptor signaling. We used a Rho-kinase inhibitor to reduce RhoA activity and the thrombin agonist TRAP6 to activate RhoA and investigated their regulatory effects on YAP following JCAD knockdown [3]. In the absence of JCAD we found that TRAP6 actiEditorial

From GWAS to new biology and treatments in CAD