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Integrative Genomics Reveals Novel Molecular Pathways and Gene Networks for Coronary Artery Disease

Author

Listed:
  • Ville-Petteri Mäkinen
  • Mete Civelek
  • Qingying Meng
  • Bin Zhang
  • Jun Zhu
  • Candace Levian
  • Tianxiao Huan
  • Ayellet V Segrè
  • Sujoy Ghosh
  • Juan Vivar
  • Majid Nikpay
  • Alexandre F R Stewart
  • Christopher P Nelson
  • Christina Willenborg
  • Jeanette Erdmann
  • Stefan Blakenberg
  • Christopher J O'Donnell
  • Winfried März
  • Reijo Laaksonen
  • Stephen E Epstein
  • Sekar Kathiresan
  • Svati H Shah
  • Stanley L Hazen
  • Muredach P Reilly
  • the Coronary ARtery DIsease Genome-Wide Replication And Meta-Analysis (CARDIoGRAM) Consortium
  • Aldons J Lusis
  • Nilesh J Samani
  • Heribert Schunkert
  • Thomas Quertermous
  • Ruth McPherson
  • Xia Yang
  • Themistocles L Assimes

Abstract

The majority of the heritability of coronary artery disease (CAD) remains unexplained, despite recent successes of genome-wide association studies (GWAS) in identifying novel susceptibility loci. Integrating functional genomic data from a variety of sources with a large-scale meta-analysis of CAD GWAS may facilitate the identification of novel biological processes and genes involved in CAD, as well as clarify the causal relationships of established processes. Towards this end, we integrated 14 GWAS from the CARDIoGRAM Consortium and two additional GWAS from the Ottawa Heart Institute (25,491 cases and 66,819 controls) with 1) genetics of gene expression studies of CAD-relevant tissues in humans, 2) metabolic and signaling pathways from public databases, and 3) data-driven, tissue-specific gene networks from a multitude of human and mouse experiments. We not only detected CAD-associated gene networks of lipid metabolism, coagulation, immunity, and additional networks with no clear functional annotation, but also revealed key driver genes for each CAD network based on the topology of the gene regulatory networks. In particular, we found a gene network involved in antigen processing to be strongly associated with CAD. The key driver genes of this network included glyoxalase I (GLO1) and peptidylprolyl isomerase I (PPIL1), which we verified as regulatory by siRNA experiments in human aortic endothelial cells. Our results suggest genetic influences on a diverse set of both known and novel biological processes that contribute to CAD risk. The key driver genes for these networks highlight potential novel targets for further mechanistic studies and therapeutic interventions.Author Summary: Sudden death due to heart attack ranks among the top causes of death in the world, and family studies have shown that genetics has a substantial effect on heart disease risk. Recent studies suggest that multiple genetic factors each with modest effects are necessary for the development of CAD, but the genes and molecular processes involved remain poorly understood. We conducted an integrative genomics study where we used the information of gene-gene interactions to capture groups of genes that are most likely to increase heart disease risk. We not only confirmed the importance of several known CAD risk processes such as the metabolism and transport of cholesterol, immune response, and blood coagulation, but also revealed many novel processes such as neuroprotection, cell cycle, and proteolysis that were not previously implicated in CAD. In particular, we highlight several genes such as GLO1 with key regulatory roles within these processes not detected by the first wave of genetic analyses. These results highlight the value of integrating population genetic data with diverse resources that functionally annotate the human genome. Such integration facilitates the identification of novel molecular processes involved in the pathogenesis of CAD as well as potential novel targets for the development of efficacious therapeutic interventions.

Suggested Citation

  • Ville-Petteri Mäkinen & Mete Civelek & Qingying Meng & Bin Zhang & Jun Zhu & Candace Levian & Tianxiao Huan & Ayellet V Segrè & Sujoy Ghosh & Juan Vivar & Majid Nikpay & Alexandre F R Stewart & Christ, 2014. "Integrative Genomics Reveals Novel Molecular Pathways and Gene Networks for Coronary Artery Disease," PLOS Genetics, Public Library of Science, vol. 10(7), pages 1-14, July.
  • Handle: RePEc:plo:pgen00:1004502
    DOI: 10.1371/journal.pgen.1004502
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    References listed on IDEAS

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