Genome-wide association study for endothelial growth factors

Circ Cardiovasc Genet. 2015 Apr;8(2):389-97. doi: 10.1161/CIRCGENETICS.114.000597. Epub 2014 Dec 31.

Abstract

Background: Endothelial growth factors including angiopoietin-2 (Ang-2), its soluble receptor Tie-2 (sTie-2), and hepatocyte growth factor play important roles in angiogenesis, vascular remodeling, local tumor growth, and metastatic potential of various cancers. Circulating levels of these biomarkers have a heritable component (between 13% and 56%), but the underlying genetic variation influencing these biomarker levels is largely unknown.

Methods and results: We performed a genome-wide association study for circulating Ang-2, sTie-2, and hepatocyte growth factor in 3571 Framingham Heart Study participants and assessed replication of the top hits for Ang-2 and sTie-2 in 3184 participants of the Study of Health in Pomerania. In multivariable-adjusted models, sTie-2 and hepatocyte growth factor concentrations were associated with single-nucleotide polymorphisms in the genes encoding the respective biomarkers (top P=2.40×10(-65) [rs2273720] and 3.64×10(-19) [rs5745687], respectively). Likewise, rs2442517 in the MCPH1 gene (in which the Ang-2 gene is embedded) was associated with Ang-2 levels (P=5.05×10(-8) in Framingham Heart Study and 8.39×10(-5) in Study of Health in Pomerania). Furthermore, single-nucleotide polymorphisms in the AB0 gene were associated with sTie-2 (top single-nucleotide polymorphism rs8176693 with P=1.84×10(-33) in Framingham Heart Study; P=2.53×10(-30) in Study of Health in Pomerania) and Ang-2 (rs8176746 with P=2.07×10(-8) in Framingham Heart Study; P=0.001 in Study of Health in Pomerania) levels on a genome-wide significant level. The top genetic loci were explained between 1.7% (Ang-2) and 11.2% (sTie-2) of the interindividual variation in biomarker levels.

Conclusions: Genetic variation contributes to the interindividual variation in growth factor levels and explains a modest proportion of circulating hepatocyte growth factor, Ang-2, and Tie-2. This may potentially contribute to the familial susceptibility to cancer, a premise that warrants further studies.

Keywords: Genome-Wide Association Study; Tie-2 receptor; angiopoietin-2; endothelial growth factors; genetics; hepatocyte growth factor.

Publication types

  • Clinical Study
  • Multicenter Study
  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Female
  • Genetic Predisposition to Disease*
  • Genome-Wide Association Study
  • Hepatocyte Growth Factor / genetics*
  • Humans
  • Male
  • Middle Aged
  • Models, Genetic
  • Neoplasms / genetics*
  • Polymorphism, Single Nucleotide*
  • Receptor, TIE-2 / genetics*
  • Vesicular Transport Proteins / genetics*

Substances

  • HGF protein, human
  • VPS51 protein, human
  • Vesicular Transport Proteins
  • Hepatocyte Growth Factor
  • Receptor, TIE-2