Precision Cardiogenomics in Athletes

Area of Science:

• Cardiovascular Genetics
• Exercise Physiology
• Molecular Cardiology

Background:

• Sudden cardiac death (SCD) in athletes often signals underlying inherited cardiovascular disorders.
• Intense exercise acts as a trigger by increasing adrenergic stress, altering calcium cycling, and imposing mechanical and metabolic demands.

Purpose of the Study:

• To review the molecular mechanisms linking genetic predispositions to arrhythmogenic phenotypes in athletes.
• To explore how exercise-induced physiological remodeling interacts with these genetic pathways.
• To discuss strategies for risk stratification and prevention of SCD in athletes.

Main Methods:

• Review of molecular pathways involved in hypertrophic cardiomyopathy, arrhythmogenic cardiomyopathy, and inherited channelopathies.
• Examination of exercise-related signaling cascades including IGF-1/PI3K/AKT, mitochondrial biogenesis, and oxidative stress.
• Integration of genetic data, polygenic risk scores, and digital phenotyping for risk assessment.

Main Results:

• Specific molecular defects in sarcomeric proteins, desmosomes, and ion channels predispose athletes to SCD.
• Exercise modulates pathways like IGF-1/PI3K/AKT, inflammation, and epigenetics, influencing disease expression.
• Genotype-positive/phenotype-negative states and variable penetrance highlight the complexity of exercise-mediated disease.

Conclusions:

• Understanding the genotype-phenotype link in inherited heart conditions is crucial for preventing SCD in athletes.
• Integrating molecular, genetic, and digital data can improve risk stratification and identify therapeutic targets.
• Further research into exercise's role in disease expression is needed for effective prevention strategies.