Mechanistic Pathways Underlying Genetic Predisposition to Atrial Fibrillation Are Associated With Different Cardiac...

Area of Science:

• Cardiovascular Genetics
• Atrial Fibrillation Pathophysiology
• Stroke Etiology

Background:

• Genome-wide association studies (GWAS) identify genetic variants associated with atrial fibrillation (AF).
• These variants cluster into biological pathways, suggesting diverse pathophysiological mechanisms.
• Understanding these pathways is crucial for elucidating AF development and complications.

Purpose of the Study:

• To investigate associations between distinct AF-associated genetic pathways and intermediate cardiac phenotypes.
• To determine if these pathways confer differing risks of cardioembolic stroke.
• To explore the etiological heterogeneity of AF and its clinical sequelae.

Main Methods:

• Utilized genetic epidemiological methods on large-scale datasets (UK Biobank, deCODE, GIGASTROKE).
• Examined three AF-related genetic pathways: cardiac muscle function, cardiac development, and cardiac ion channels.
• Assessed associations with intermediate phenotypes: ECG parameters, cardiac imaging, plasma biomarkers, and ischemic stroke subtypes.

Main Results:

• Distinct AF genetic pathways significantly influenced cardiac phenotypes.
• The muscle pathway correlated with longer PR interval, lower left atrial function, and higher NT-proBNP.
• The ion-channel pathway showed a reduced risk of cardioembolic stroke.

Conclusions:

• Genetic variants in specific AF mechanistic pathways are linked to distinct cardiac phenotypes.
• These pathways differentially affect cardioembolic stroke risk.
• Findings enhance understanding of AF heterogeneity and may guide targeted therapeutic strategies.