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Glycoprotein IIIa polymorphism and risk of myocardial infarction
1Department of Medicine, University of Leicester, UK.
Objectives:
To prospectively investigate whether the PlA2 variant of the platelet adhesion molecule glycoprotein IIIa influences the risk of myocardial infarction.
Background:
The platelet glycoprotein IIb/IIIa receptor plays an important role in platelet aggregation. The IIIa polypeptide is polymorphic due to a single base change at position 1565 resulting in either proline PlA1 or leucine PlA2 at position 33 in the protein. It has recently been reported that the PlA2 variant may be strongly associated with the risk of acute coronary syndromes, particularly in younger subjects.
Methods:
PlA genotypes of 242 prospectively collected cases of first myocardial infarction admitted to our Coronary Care Unit were compared with those of 209 community-based control subjects.
Results:
We found no difference in either PlA genotype (P = 0.65) or allele (P = 0.64) frequencies between cases and controls. The PlA2 allele frequency was 18.2 and 19.4% in cases and controls, respectively. The age- and sex-stratified odds ratio for risk of myocardial infarction associated with the PlA2 allele was 0.89 (95% CI 0.58-1.37, P = 0.65) and remained non-significant when the analysis was confined to subjects under the age of 60 (odds ratio 0.77, 95% CI 0.38-1.56, P = 0.44). There was no interaction between PlA2 and other coronary risk factors. For cases, the age at myocardial infarction was not different between those carrying the PlA2 allele and those not (66.3 +/- 10.8 vs. 65.6 +/- 11.7 years, P = 0.63).
Conclusions:
We conclude that, in our subjects, the PlA2 variant of platelet glycoprotein IIIa is not an important risk factor for myocardial infarction.
Insights
The PlA2 variant of platelet glycoprotein IIIa does not appear to be a significant risk factor for myocardial infarction. This study found no association between the PlA2 variant and heart attack risk in the studied population.
Area of Science:
- Cardiovascular genetics
- Platelet biology
- Molecular diagnostics
Background:
- The glycoprotein IIb/IIIa receptor is crucial for platelet aggregation.
- A common polymorphism in the glycoprotein IIIa gene results in PlA1 and PlA2 variants.
- Previous research suggested a potential link between the PlA2 variant and acute coronary syndromes, especially in younger individuals.
Purpose of the Study:
- To prospectively evaluate the association between the PlA2 variant of platelet glycoprotein IIIa and the risk of myocardial infarction.
- To determine if the PlA2 variant influences myocardial infarction risk in different age groups.
Main Methods:
- A prospective case-control study comparing PlA genotypes.
- 242 first-time myocardial infarction cases were compared with 209 community controls.
- Genotype frequencies and allele frequencies were analyzed.
Main Results:
- No significant difference in PlA genotype or allele frequencies was observed between myocardial infarction cases and controls.
- The PlA2 allele frequency was similar in both groups (18.2% in cases vs. 19.4% in controls).
- The odds ratio for myocardial infarction associated with the PlA2 allele was not significant, even when analyzing subjects under 60.
Conclusions:
- The PlA2 variant of platelet glycoprotein IIIa is not identified as a significant risk factor for myocardial infarction in this study population.
- The findings do not support a role for the PlA2 variant in the pathogenesis of myocardial infarction.
- No interaction was found between the PlA2 variant and other established coronary risk factors.