Genetics of right ventricular cardiomyopathy

Area of Science:

• Cardiology
• Genetics
• Pathology

Background:

• Arrhythmogenic right ventricular cardiomyopathy (ARVC) is an inherited heart muscle disease.
• Pathologically, it involves myocyte loss and fibrofatty replacement, primarily in the right ventricle.
• ARVC is characterized by ventricular arrhythmias and sudden death, distinct from dilated cardiomyopathy.

Purpose of the Study:

• To review the genetic basis and pathogenesis of ARVC.
• To highlight the role of desmosomal gene mutations.
• To discuss the mechanisms contributing to arrhythmogenicity.

Main Methods:

• Review of existing literature on ARVC genetics and pathology.
• Analysis of desmosome function and its relation to ARVC.
• Exploration of pathogenic mechanisms leading to arrhythmias.

Main Results:

• Causative mutations identified in desmosomal genes (plakoglobin, desmoplakin, plakophilin).
• A proposed pathogenesis model involving impaired cell adhesion and shear stress.
• Multiple mechanisms contribute to the arrhythmogenic substrate, including inflammation, fibrofatty infiltration, and gap junction remodeling.

Conclusions:

• ARVC is fundamentally a desmosome-related disease.
• Understanding genetic defects provides insights into pathogenesis and the broad phenotypic spectrum.
• Further research into genetic defects may reveal more about ARVC phenocopies.