title: Meta-Analysis of Genome-Wide Association Studies for Abdominal Aortic Aneurysm Identifies Four New Disease-Specific Risk Loci.
abstract: BACKGROUND
  Abdominal aortic aneurysm (AAA) is a complex disease with both genetic and environmental risk factors. Together, 6 previously identified risk loci only explain a small proportion of the heritability of AAA.
  
  
  OBJECTIVE
  To identify additional AAA risk loci using data from all available genome-wide association studies.
  
  
  RESULTS
  Through a meta-analysis of 6 genome-wide association study data sets and a validation study totaling 10 204 cases and 107 766 controls, we identified 4 new AAA risk loci: 1q32.3 (SMYD2), 13q12.11 (LINC00540), 20q13.12 (near PCIF1/MMP9/ZNF335), and 21q22.2 (ERG). In various database searches, we observed no new associations between the lead AAA single nucleotide polymorphisms and coronary artery disease, blood pressure, lipids, or diabetes mellitus. Network analyses identified ERG, IL6R, and LDLR as modifiers of MMP9, with a direct interaction between ERG and MMP9.
  
  
  CONCLUSIONS
  The 4 new risk loci for AAA seem to be specific for AAA compared with other cardiovascular diseases and related traits suggesting that traditional cardiovascular risk factor management may only have limited value in preventing the progression of aneurysmal disease.
authors.affiliation: For the author affiliations, please see the Appendix. m.bown@le.ac.uk greg.jones@otago.ac.nz.
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mesh_terms: D017544:Aortic Aneurysm, Abdominal / Q000175:diagnosis* / Q000453:epidemiology / Q000235:genetics*; D056426:Genetic Loci / Q000235:genetics*; D020022:Genetic Predisposition to Disease / Q000453:epidemiology / Q000235:genetics*; D014644:Genetic Variation / Q000235:genetics; D055106:Genome-Wide Association Study / Q000379:methods* / Q000639:trends; D006801:Humans
keywords: aortic aneurysm, abdominal; computational biology; genetics; genome-wide association study; matrix metalloproteinases; meta-analysis