Pathophysiology of arrhythmogenic cardiomyopathy

Area of Science:

• Cardiology
• Genetics
• Molecular Biology

Background:

• Arrhythmogenic cardiomyopathy (AC) is a heterogeneous heart muscle disorder linked to ventricular arrhythmias and sudden cardiac death.
• Mutations in desmosomal genes are implicated in about half of AC cases, leading to its classification as a 'desmosomal' disease.
• Current diagnostic criteria (revised 2010) aim to balance sensitivity and specificity, incorporating quantitative parameters and family history.

Purpose of the Study:

• To review the genetic basis and diagnostic challenges of arrhythmogenic cardiomyopathy.
• To explore the progressive nature of AC and the need for advanced research models.
• To highlight ongoing investigations into molecular pathways for developing targeted therapies.

Main Methods:

• Review of genetic findings in arrhythmogenic cardiomyopathy patients.
• Analysis of diagnostic criteria and their limitations.
• Discussion of experimental data and cellular/animal models for disease insight.

Main Results:

• Approximately 50% of AC cases are associated with mutations in key desmosomal genes.
• Defining a 'pathogenic' mutation requires careful interpretation due to screening complexities.
• Experimental data suggest AC develops postnatally, initiated by cardiomyocyte necrosis.

Conclusions:

• Arrhythmogenic cardiomyopathy is a complex genetic disorder requiring nuanced diagnostic approaches.
• Understanding the molecular cascade, including desmosome-nucleus crosstalk, is crucial for therapeutic advancements.
• Future research aims to shift from symptomatic treatment to targeted therapies that halt disease onset and progression.