Researchers Uncover Genetic Clues to Blood Pressure
News May 18, 2009
An international research team has identified a number of unsuspected genetic variants associated with systolic blood pressure (SBP), diastolic blood pressure (DBP), and hypertension (high blood pressure), suggesting potential avenues of investigation for the prevention or treatment of hypertension.
The research was funded in part by the National Heart, Lung, and Blood Institute (NHLBI) of the National Institutes of Health and by several other NIH institutes and centers.
The analysis of over 29,000 participants is being presented at the American Society of Hypertension, Inc. scientific meeting on May 8, 2009, and is published online in the journal Nature Genetics on May 10, 2009.
"This study provides important new insights into the biology of blood pressure regulation and, with continued research, may lead to the development of novel therapeutic approaches to combat hypertension and its complications," said NHLBI Director Elizabeth G. Nabel, M.D.
About 1 in 3 adults (approximately 72 million people) in the United States has high blood pressure. Hypertension can lead to coronary heart disease, heart failure, stroke, kidney failure, and other health problems, and causes over 7 million deaths worldwide each year.
Blood pressure has a substantial genetic component and hypertension runs in families. Previous attempts to identify genes associated with blood pressure, however, have met with limited success.
In a genome-wide association study (GWAS), researchers scanned millions of common genetic variants of individuals from the Cohorts for Heart and Aging Research in Genomic Epidemiology (CHARGE) consortium to find variants associated with blood pressure and hypertension. This extensive resource includes white men and women from the Framingham Heart Study, Atherosclerosis Risk in Communities study, Cardiovascular Health Study, the Rotterdam Study, the Rotterdam Extension Study, and the Age, Gene/Environment Susceptibility Reykjavik Study.
The investigators identified a number of genetic variants or single-nucleotide polymorphisms (SNPs) associated with SBP, DBP, and hypertension. When they jointly analyzed their findings with those from the GWAS of over 34,000 participants in the Global BPgen Consortium, they identified 11 genes showing significant associations across the genome: four for SBP, six for DBP, and one for hypertension.
"Large scale genome-wide association studies are providing a number of important insights into identifying genes that play a role in diseases with major public health impact," said Dr. Daniel Levy, first author of the study and director, the NHLBI's Framingham Heart Study and Center for Population Studies. "We have identified eight key genes, few of which would have been on anyone's short list of suspected blood pressure genes until now."
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