Brugada syndrome and p.E61X_RANGRF

Area of Science:

• Cardiology
• Genetics
• Molecular Biology

Background:

• Brugada syndrome is an inherited cardiac condition associated with sudden cardiac death due to malignant ventricular arrhythmias.
• The RANGRF gene, encoding the MOG1 protein, a Nav1.5 sodium channel co-factor, has been implicated in Brugada syndrome.
• A specific nonsense variation, p.E61X in RANGRF, has been proposed as a cause, but its association is not definitively established.

Purpose of the Study:

• To investigate the clinical and genetic significance of the p.E61X variation in the RANGRF gene within a Spanish family affected by Brugada syndrome.
• To determine if the p.E61X variation is associated with Brugada syndrome in this cohort.

Main Methods:

• Clinical and genetic evaluation of a Spanish family with Brugada syndrome.
• Comprehensive genetic analysis of known Brugada syndrome genes in the proband.
• Flecainide challenge test to unmask Brugada syndrome electrocardiogram patterns.

Main Results:

• The proband was diagnosed with Brugada syndrome post-flecainide testing.
• The p.E61X nonsense variation in the RANGRF gene was identified in the proband and five other family members.
• While most affected individuals had normal baseline electrocardiograms, the flecainide test revealed a type 1 Brugada syndrome pattern in only two relatives.

Conclusions:

• The p.E61X variation in the RANGRF gene appears to be a rare genetic finding with an unclear role in Brugada syndrome.
• Further research is necessary to fully elucidate the potential pathogenic contribution of p.E61X_RANGRF to Brugada syndrome.