Identification of arrhythmogenic right ventricular cardiomyopathy-causing gene mutations in young sudden unexpected...

Area of Science:

• Cardiology
• Genetics
• Forensic Pathology

Background:

• Arrhythmogenic right ventricular cardiomyopathy (ARVC) is a significant cause of sudden cardiac death.
• Identifying genetic underpinnings in unexplained sudden death cases is crucial for diagnosis and family screening.

Purpose of the Study:

• To investigate mutations in desmoglein-2 (DSG2), desmoplakin (DSP), and plakophilin-2 (PKP2) in individuals who died suddenly without a clear autopsy diagnosis.
• To explore the potential association between identified gene mutations and the cause of sudden cardiac death.

Main Methods:

• Postmortem genetic analysis was performed on DNA samples from 15 cases of unexplained sudden death.
• Targeted sequencing focused on genes known to be associated with cardiomyopathies, including DSG2, DSP, and PKP2.

Main Results:

• Mutations in the DSP gene were identified in three out of 15 cases (20%).
• Two of the identified DSP mutations were novel, while one was previously linked to clinically diagnosed ARVC.
• Histological findings were not definitively characteristic of ARVC, highlighting the value of genetic analysis.

Conclusions:

• DSP mutations may be associated with fatal arrhythmias and sudden death, even in the absence of typical ARVC histological features.
• Postmortem genetic testing, combined with traditional autopsy methods, can aid in determining the cause of death in young individuals.
• Further research is needed to clarify the causal relationship between these DSP mutations and ARVC.