Genetically Determined Platelet Count and Risk of Cardiovascular Disease

Area of Science:

• Cardiovascular epidemiology
• Genetic epidemiology
• Mendelian randomization

Background:

• Cardiovascular diseases, including coronary artery disease (CAD) and ischemic stroke, are leading global causes of mortality.
• Understanding the causal factors influencing these conditions is crucial for effective prevention strategies.

Purpose of the Study:

• To investigate the causal relationship between genetically determined platelet count and the risk of developing coronary artery disease (CAD) and ischemic stroke.
• To utilize Mendelian randomization as a robust method to infer causality from observational data.

Main Methods:

• Employed Mendelian randomization using genetic variants as instrumental variables for platelet count.
• Utilized large-scale genome-wide association study data for platelet count, CAD, and ischemic stroke.
• Applied inverse-variance weighted meta-analysis for causal effect estimation, with sensitivity analyses for pleiotropy.

Main Results:

• No significant causal association was found between genetically determined platelet count and the risk of coronary artery disease (OR, 1.01; P=0.60).
• A significant causal association was identified between higher genetically determined platelet count and an increased risk of ischemic stroke (OR, 1.07; P<1×10^-5).
• This association with ischemic stroke risk held true across major stroke subtypes and was consistent in sensitivity analyses.

Conclusions:

• Genetically determined higher platelet count is causally linked to an elevated risk of ischemic stroke.
• Platelet count emerges as a potential causal risk factor for ischemic stroke, distinct from its role in CAD.
• These findings suggest that modulating platelet count could be a therapeutic target for reducing ischemic stroke incidence.