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Prothrombotic genetic risk factors in young survivors of myocardial infarction
D Ardissino1, P M Mannucci, P A Merlini
1Division of Cardiology, IRCCS Policlinico San Matteo and University of Pavia, Pavia, Italy.
Insights
The PIA2 allele of platelet glycoprotein IIIa is linked to a higher risk of heart attack in young adults. Smoking amplifies this genetic risk, contributing significantly to premature myocardial infarction.
Area of Science:
- Cardiovascular Genetics
- Thrombosis Research
- Molecular Epidemiology
Background:
- An increased tendency for thrombosis is a known risk factor for myocardial infarction, particularly in younger individuals.
- Several genetic factors influencing thrombotic risk have been identified, prompting investigation into their role in early-onset myocardial infarction.
Purpose of the Study:
- To investigate the association between specific prothrombotic genetic polymorphisms and the risk of myocardial infarction in young adults.
- To identify which genetic factors, if any, are significantly linked to premature heart attacks.
Main Methods:
- A case-control study was conducted with 200 young myocardial infarction survivors (under 45 years) and 200 matched healthy controls.
- Genotyping was performed for several polymorphisms: PAI-1 4G/5G, platelet glycoprotein IIIa PIA1/PIA2, platelet glycoprotein Ib C3550T, factor VII G10976A, MTHFR C677T, factor V G1691A, and prothrombin G20210A.
Main Results:
- The PIA2 polymorphic allele of platelet glycoprotein IIIa was the sole prothrombotic genetic factor significantly associated with an increased risk of myocardial infarction at a young age (OR 1.84, 95% CI 1.12-3.03).
- A significant interaction was observed between the PIA2 allele and smoking, with this combination accounting for 46% of premature myocardial infarctions.
- No significant association was found for other tested prothrombotic genetic factors.
Conclusions:
- Carrying the PIA2 polymorphic allele of platelet glycoprotein IIIa is identified as a significant genetic risk factor for developing myocardial infarction at a young age.
- Smoking appears to potentiate the clinical expression of this genetic predisposition, highlighting a critical gene-environment interaction in premature cardiovascular disease.
Abstract:
It has long been thought that an individual thrombotic tendency increases the risk of myocardial infarction, especially in young adults. Several "prothrombotic" genetic factors that may influence the individual thrombotic risk have been identified. To investigate the association between the risk of myocardial infarction at a young age and genetic factors thought to be associated with an increased tendency to thrombosis (the polymorphisms 4G/5G of the PAI-1 gene, PIA1/PIA2 of the platelet glycoprotein IIIa, C3550T of the platelet glycoprotein Ib gene, G10976A of the factor VII gene, C677T of the methylenetetrahydrofolate reductase gene, G1691A of the factor V gene, and G20210A of the prothrombin gene), we performed a case-control study evaluating 200 survivors (185 men, 15 women) of myocardial infarction who had experienced the event before the age of 45 years and 200 healthy subjects with a negative exercise test, individually matched for sex, age, and geographic origin with the cases. The presence of the PIA2 polymorphic allele was the only prothrombotic genetic factor associated with the risk of myocardial infarction at a young age. The odds ratio for carriers of the PIA2 allele compared with those of the PIA1 allele was 1.84 (95% confidence intervals (CI) 1.12 to 3.03). There was a significant interaction between the presence of the PIA2 allele and smoking: with their simultaneous presence, 46% (95% confidence intervals 11% to 81%) of premature myocardial infarctions were attributable to the interaction between the two factors. In conclusion, carrying the PIA2 polymorphic allele of platelet glycoprotein IIIa was the only genetic prothrombotic factor associated with the risk of developing myocardial infarction at a young age. The clinical expression of this genetic predisposition seems to be enhanced by smoking.