Myocardial Infarction-Associated SNP at 6p24 Interferes with MEF2 Binding and Associates with PHACTR1 Expression Levels in Human Coronary Arteries

Mélissa Beaudoin, Rajat M. Gupta, Hong Hee Won, Ken Sin Lo, Ron Do, Christopher A. Henderson, Claire Lavoie-St-Amour, Simon Langlois, Daniel Rivas, Stephanie Lehoux, Sekar Kathiresan, Jean Claude Tardif, Kiran Musunuru, Guillaume Lettre

Research output: Contribution to journalArticlepeer-review

68 Scopus citations


Objective - Coronary artery disease (CAD), including myocardial infarction (MI), is the main cause of death in the world. Genome-wide association studies have identified dozens of single nucleotide polymorphisms (SNPs) associated with CAD/MI. One of the most robust CAD/MI genetic associations is with intronic SNPs in the gene PHACTR1 on chromosome 6p24. How these PHACTR1 SNPs influence CAD/MI risk, and whether PHACTR1 itself is the causal gene at the locus, is currently unknown. Approach and Results - Using genetic fine-mapping and DNA resequencing experiments, we prioritized an intronic SNP (rs9349379) in PHACTR1 as causal variant. We showed that this variant is an expression quantitative trait locus for PHACTR1 expression in human coronary arteries. Experiments in endothelial cell extracts confirmed that alleles at rs9349379 are differentially bound by the transcription factors myocyte enhancer factor-2. We engineered a deletion of this myocyte enhancer factor-2-binding site using CRISPR/Cas9 genome-editing methodology. Heterozygous endothelial cells carrying this deletion express 35% less PHACTR1. Finally, we found no evidence that PHACTR1 expression levels are induced when stimulating human endothelial cells with vascular endothelial growth factor, tumor necrosis factor-α, or shear stress. Conclusions - Our results establish a link between intronic SNPs in PHACTR1, myocyte enhancer factor-2 binding, and transcriptional functions at the locus, PHACTR1 expression levels in coronary arteries and CAD/MI risk. Because PHACTR1 SNPs are not associated with the traditional risk factors for CAD/MI (eg, blood lipids or pressure, diabetes mellitus), our results suggest that PHACTR1 may influence CAD/MI risk through as yet unknown mechanisms in the vascular endothelium.

Original languageEnglish
Pages (from-to)1472-1479
Number of pages8
JournalArteriosclerosis, Thrombosis, and Vascular Biology
Issue number6
StatePublished - 27 Jun 2015
Externally publishedYes


  • coronary artery disease
  • genetic association studies
  • myocardial infarction


Dive into the research topics of 'Myocardial Infarction-Associated SNP at 6p24 Interferes with MEF2 Binding and Associates with PHACTR1 Expression Levels in Human Coronary Arteries'. Together they form a unique fingerprint.

Cite this