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New susceptibility alleles associated with severe coronary artery stenosis in the Lebanese population
Victor Wakim1, Elie Abi Khalil2, Angelique K Salloum1
1School of Medicine, Lebanese American University, Beirut, Lebanon.
Insights
This study identified new genetic factors linked to severe coronary artery disease (CAD) and highlighted distinct risk factors for early-onset CAD. These findings advance our understanding of genetic predispositions in coronary artery disease.
Area of Science:
- Cardiovascular Genetics
- Genomics
- Medical Research
Background:
- Coronary Artery Disease (CAD) involves narrowed or blocked coronary arteries, influenced by genetics and environment.
- Severe CAD phenotypes are increasingly linked to specific genetic risk factors.
- Understanding these genetic links is crucial for risk stratification and personalized medicine.
Purpose of the Study:
- To investigate associations between clinical, demographic, and genetic factors and severe coronary artery stenosis.
- To identify novel genetic variants contributing to severe CAD and early-onset CAD.
- To compare genetic associations across different patient stratification models.
Main Methods:
- Genome-wide association studies (GWAS) using generalized linear models (GLM).
- Analysis of 1734 individuals with severe coronary stenosis (≥50% narrowing) and 757 controls.
- Stratification of patients based on CAD family history and age of onset.
Main Results:
- Eight single nucleotide polymorphisms (SNPs) showed significant association with severe CAD phenotypes.
- Four SNPs were linked to overall severe CAD, and four were specific to young CAD patients.
- Six associated SNPs are located within genes previously implicated in coronary disease.
Conclusions:
- The study identifies novel genetic factors associated with severe coronary artery stenosis.
- Distinct genetic risk factors are associated with a young age at CAD diagnosis.
- These findings contribute to understanding the genetic architecture of severe and early-onset CAD.
Background:
Coronary Artery Disease (CAD) is the narrowing or blockage of the coronary arteries. It is closely associated with numerous genetics and environmental factors that have been extensively evaluated in various populations. In recent studies, severe phenotypes have been strongly linked to genetic risk factors.
Methods:
This study investigated the association of clinical, demographic, and genetic factors with severe coronary artery stenosis phenotypes in our population composed of 1734 individuals with severe coronary stenosis (≥ 50% in coronary vessels) and comparing them to 757 controls with no evidence of stenosis on angiography. We performed generalized linear model (GLM) genome-wide association studies to evaluate three stratification models and their associations to characteristics of the clinical disease. In model 1, patients were not stratified. In model 2, patients were stratified based on presence or absence of CAD family history (FxCAD). In model 3, patients were stratified by young age of CAD onset.
Results:
Eight SNPs (single nucleotide polymorphism) were significantly associated with severe CAD phenotypes in the various models [Formula: see text], four of these SNPs were associated with severe CAD and the four others were specifically significant for young CAD patients. While these SNPs were not previously reported for association with CAD, six of them are present in genes that have already been linked to coronary disease.
Conclusion:
In conclusion, this study presents new genetic factors associated with severe stenosis and highlights different risk factors associated with a young age at diagnosis of CAD.
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