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Association of apolipoprotein E polymorphism, low-density lipoprotein cholesterol, and coronary artery disease
Insights
Apolipoprotein E (APOE) gene variants influence cholesterol levels and coronary heart disease risk. APOE E4/E3 genotype is linked to higher LDL cholesterol and earlier myocardial infarction compared to E3/E2 genotype.
Area of Science:
- Genetics
- Cardiovascular Medicine
- Biochemistry
Background:
- Apolipoprotein E (APOE) plays a crucial role in lipid metabolism.
- APOE gene polymorphism is associated with variations in serum lipid profiles.
- Understanding APOE's impact on coronary heart disease (CHD) risk is vital for cardiovascular health.
Purpose of the Study:
- To investigate the association between APOE genotypes and lipid profiles in myocardial infarction (MI) survivors versus healthy controls.
- To determine if APOE isoforms influence the age of onset for MI.
- To elucidate the role of APOE polymorphism in the risk of CHD.
Main Methods:
- Genotyping of APOE isoforms in 570 MI survivors and 624 healthy individuals.
- Measurement of total cholesterol and low-density lipoprotein (LDL)-cholesterol concentrations.
- Statistical analysis comparing lipid levels and age of MI onset across different APOE genotypes.
Main Results:
- APOE E4/E3 heterozygotes had higher total and LDL-cholesterol than E3/E2 heterozygotes in controls.
- MI survivors exhibited significantly higher cholesterol levels compared to controls, with notable differences between E4/E3 and E3/E2 genotypes.
- E4/E3 heterozygosity was associated with an earlier average age of MI onset (48.8 years) compared to E3/E2 (53.4 years) and E3/E3 (51.2 years).
Conclusions:
- APOE gene polymorphism significantly impacts serum total and LDL-cholesterol levels.
- These variations in cholesterol metabolism mediated by APOE genotypes contribute to the risk of developing coronary heart disease and experiencing myocardial infarction.
- APOE genotyping may offer insights into individual susceptibility to cardiovascular events.
Abstract:
We determined the frequencies of genetic apolipoprotein E isoforms in 570 survivors of myocardial infarction, all with demonstrable coronary heart disease, as compared with 624 healthy persons. In controls, E-4/E-3 heterozygosity was associated with total cholesterol concentrations of 1985 (SD 364) mg/L and low-density lipoprotein (LDL)-cholesterol concentrations of 1306 (SD 332) mg/L. Significantly lower values, 1811 (SD 312) mg/L and 1121 (SD 274) mg/L, respectively, were observed for E-3/E-2 heterozygous persons. In survivors of myocardial infarction, the respective values were significantly higher than in controls, differing between E-4/E-3 and E-3/E-2 heterozygous patients by 233 and 220 mg/L, respectively. Moreover, E-4/E-3 heterozygosity was accompanied by earlier age of myocardial infarction (48.8 +/- 7.4 years) as compared with E-3/E-2 heterozygosity (53.4 +/- 6.9 years) and E-3/E-3 homozygosity (51.2 +/- 7.7 years). Evidently, apolipoprotein E polymorphism can contribute to total and LDL-cholesterol concentrations in serum, thereby affecting risk of coronary heart disease and myocardial infarction.