RBM20-Associated Ventricular Arrhythmias in a Patient with Structurally Normal Heart.

Area of Science:

• Cardiovascular Genetics
• Molecular Cardiology
• Splicing Factor Research

Background:

• RNA-binding motif protein 20 (RBM20) is a critical splicing factor involved in cardiac gene regulation.
• RBM20 mutations are linked to various cardiomyopathies, including dilated cardiomyopathy via titin (TTN) gene splicing defects.
• Previous research associated RBM20 variants with arrhythmogenic right ventricular cardiomyopathy and left ventricular noncompaction.

Observation:

• This report describes a unique clinical case.
• The patient presented with a rare arrhythmogenic phenotype.
• Notably, no structural cardiac abnormalities were detected in this individual.

Findings:

• A genetic variant in RBM20 of uncertain significance was identified in the patient.
• The variant was associated with an arrhythmogenic phenotype despite the absence of structural heart disease.
• This finding expands the spectrum of clinical presentations linked to RBM20 variants.

Implications:

• This case highlights the complex relationship between RBM20 variants and cardiac arrhythmias.
• It suggests that RBM20 dysfunction can lead to arrhythmogenic phenotypes even without overt cardiomyopathy.
• Further research is needed to clarify the pathogenicity of uncertain RBM20 variants and their role in cardiac electrophysiology.