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Olle Melander

Principal investigator

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Hypertension and Genetic Variation in Endothelial-Specific Genes

Author

  • Erik Larsson
  • Bjorn Wahlstrand
  • Bo Hedblad
  • Thomas Hedner
  • Sverre E. Kjeldsen
  • Olle Melander
  • Per Lindahl

Summary, in English

Genome-wide association (GWA) studies usually detect common genetic variants with low-to-medium effect sizes. Many contributing variants are not revealed, since they fail to reach significance after strong correction for multiple comparisons. The WTCCC study for hypertension, for example, failed to identify genome-wide significant associations. We hypothesized that genetic variation in genes expressed specifically in the endothelium may be important for hypertension development. Results from the WTCCC study were combined with previously published gene expression data from mice to specifically investigate SNPs located within endothelial-specific genes, bypassing the requirement for genome-wide significance. Six SNPs from the WTCCC study were selected for independent replication in 5205 hypertensive patients and 5320 population-based controls, and successively in a cohort of 16537 individuals. A common variant (rs10860812) in the DRAM (damage-regulated autophagy modulator) locus showed association with hypertension (P = 0.008) in the replication study. The minor allele (A) had a protective effect (OR = 0.93; 95% CI 0.88-0.98 per A-allele), which replicates the association in the WTCCC GWA study. However, a second follow-up, in the larger cohort, failed to reveal an association with blood pressure. We further tested the endothelial-specific genes for co-localization with a panel of newly discovered SNPs from large meta-GWAS on hypertension or blood pressure. There was no significant overlap between those genes and hypertension or blood pressure loci. The result does not support the hypothesis that genetic variation in genes expressed in endothelium plays an important role for hypertension development. Moreover, the discordant association of rs10860812 with blood pressure in the case control study versus the larger Malmo "Preventive Project-study highlights the importance of rigorous replication in multiple large independent studies.

Department/s

  • Cardiovascular Research - Epidemiology
  • Cardiovascular Research - Hypertension
  • EXODIAB: Excellence in Diabetes Research in Sweden
  • EpiHealth: Epidemiology for Health

Publishing year

2013

Language

English

Publication/Series

PLoS ONE

Volume

8

Issue

4

Document type

Journal article

Publisher

Public Library of Science

Topic

  • Cardiac and Cardiovascular Systems

Status

Published

Research group

  • Cardiovascular Research - Epidemiology
  • Cardiovascular Research - Hypertension

ISBN/ISSN/Other

  • ISSN: 1932-6203