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  • Title: Prevalence and significance of rare RYR2 variants in arrhythmogenic right ventricular cardiomyopathy/dysplasia: results of a systematic screening.
    Author: Roux-Buisson N, Gandjbakhch E, Donal E, Probst V, Deharo JC, Chevalier P, Klug D, Mansencal N, Delacretaz E, Cosnay P, Scanu P, Extramiana F, Keller D, Hidden-Lucet F, Trapani J, Fouret P, Frank R, Fressart V, Fauré J, Lunardi J, Charron P.
    Journal: Heart Rhythm; 2014 Nov; 11(11):1999-2009. PubMed ID: 25041964.
    Abstract:
    BACKGROUND: Arrhythmogenic right ventricular cardiomyopathy/dysplasia (ARVC/D) is a genetic disease predominantly caused by desmosomal gene mutations that account for only ~50% of cases. Ryanodine receptor 2 (RYR2) gene mutations usually cause catecholaminergic polymorphic ventricular tachycardia but have been associated with a peculiar phenotype named ARVC2. OBJECTIVE: We aimed to determine the prevalence and phenotype associated with RYR2 mutations in a large ARVC/D population. METHODS: We analyzed the whole RYR2 coding sequence by Sanger sequencing in 64 ARVC/D probands without desmosomal gene mutations. RESULTS: We have identified 6 rare missense variants: p.P1583S, p.A2213S, p.G2367R, p.Y2932H, p.V3219M, and p.L4670V. It corresponds to a 9% prevalence of rare RYR2 variants in the ARVC/D population (6 of 64 probands), which is significantly higher than the estimated frequency of rare RYR2 variants in controls (Fisher exact test, P = .03). Phenotypes associated with RYR2 variants were similar to desmosome-related ARVC/D, associating typical electrocardiographic abnormalities at rest, frequent monomorphic ventricular tachycardia, right ventricular dilatation, wall motion abnormalities, and fibrofatty replacement when histopathological examination was available. CONCLUSION: In this first systematic screening of the whole coding region of the RYR2 gene in a large ARVC/D cohort without mutation in desmosomal genes, we show that putative RYR2 mutations are frequent (9% of ARVC/D probands) and are associated with a conventional phenotype of ARVC/D, which is in contrast with previous findings. The results support the role of the RYR2 gene in conventional ARVC/D.
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