Hypoxia-inducible factor 1alpha polymorphism and coronary collaterals in patients with ischemic heart disease

Area of Science:

• Cardiovascular Genetics
• Molecular Cardiology
• Ischemic Heart Disease Research

Background:

• Coronary artery collateral formation varies significantly among patients with ischemic heart disease.
• The role of genetic factors, particularly Hypoxia Inducible Factor 1 (HIF-1), in collateral development is not well understood.
• HIF-1 is a key regulator of oxygen homeostasis and may influence angiogenesis.

Purpose of the Study:

• To investigate the association between genetic variations in HIF-1alpha and the development of coronary artery collaterals.
• To determine if a specific HIF-1alpha single nucleotide polymorphism (SNP) influences collateralization in patients with coronary artery disease.

Main Methods:

• Studied 100 patients with significant coronary artery narrowing (>70%) and no history of acute myocardial infarction or revascularization.
• Assessed collateral vessel formation and performed DNA genotyping for a HIF-1alpha C-to-T polymorphism at residue 582 (Pro582Ser).

Main Results:

• The frequency of the T allele (associated with HIF-1alpha Ser582) was significantly higher in patients lacking collaterals compared to those with collaterals (0.188 vs. 0.037, p < 0.001).
• Multivariate analysis identified two- or three-vessel coronary artery disease as a positive predictor (OR, 4.17) of collateral formation.
• The HIF-1alpha CT or TT genotype (carrying the T allele) was a negative predictor of collateral formation (OR, 0.19; p=0.03).

Conclusions:

• Genetic variations in HIF-1alpha appear to influence the development of coronary artery collaterals in patients with significant coronary artery disease.
• The presence of the HIF-1alpha T allele may be associated with impaired collateralization, suggesting a genetic predisposition to reduced collateral growth.