Coronary artery disease (CAD) is the most common form of heart disease and is a leading cause of death worldwide. It is one of the root causes of angina, heart failure and arrhythmias. This work could allow researchers to better understand why the disease develops and may offer new approaches for pharmacological prevention and treatment.
"Until recently, we looked at one variation at a time when trying to find new genes associated with disease", stated David Tregouet, Pierre and Marie Curie University (UPMC), France. "In this work we are using an original approach which lets us look at several variations at once. So, instead of investigating the effect on CAD risk of the 378.000 individual genetic markers available in this project, more than 8,1 million combinations were tested. We could do this large number of calculations thanks to EGEE."
The work was done in three stages to successfully narrow down the genetic sequences within a person's chromosomes that could make them susceptible to CAD. In the first stage, almost 8,1 million configurations of genetic markers were examined and 29 specific combinations were identified as possibly associated with susceptibility to CAD. Focusing on these 29 combinations, the second stage was able to bring this number down to just one combination of four genetic markers confirmed to be strongly associated with the risk of CAD. When these four genetic markers were investigated in additional studies, covering a total of almost 12.000 individuals, there was a strong correlation between their presence and the risk of having CAD.
One of the possible explanations behind why these four genetic markers seem to indicate that a person may be at an increased risk of CAD, is that they overlap with genes that regulate an enzyme called lipoprotein (a). A raised level of lipoprotein (a) is used by doctors around the world to diagnose CAD. When the Cardiogenics consortium compared the levels of the enzyme in one of the studies, they found that there was a strong correlation between high lipoprotein levels and the presence of the identified gene sequences.
The paper titled "Genome-wide haplotype association study identifies the SLC22A3-LPAL2-LPA gene cluster as a risk locus for coronary artery disease" appears in Nature Genetics 41, 283-285 (2009).
More EGEE news is available in the VMW October 2008 article Grids are more than just an infrastructure.