Article ; Online: Cardiac arrest in a mother and daughter and the identification of a novel RYR2 variant, predisposing to low penetrant catecholaminergic polymorphic ventricular tachycardia in a four-generation Canadian family.
Molecular genetics & genomic medicine
2020 Volume 8, Issue 4, Page(s) e1151
Abstract: Background: Catecholaminergic polymorphic ventricular tachycardia (CPVT) is a rare inherited arrhythmia syndrome characterized by adrenergically driven ventricular arrhythmia predominantly caused by pathogenic variants in the cardiac ryanodine receptor ( ...
Abstract | Background: Catecholaminergic polymorphic ventricular tachycardia (CPVT) is a rare inherited arrhythmia syndrome characterized by adrenergically driven ventricular arrhythmia predominantly caused by pathogenic variants in the cardiac ryanodine receptor (RyR2). We describe a novel variant associated with cardiac arrest in a mother and daughter. Methods: Initial sequencing of the RYR2 gene identified a novel variant (c.527G > T, p.R176L) in the index case (the mother), and her daughter. Structural analysis demonstrated the variant was located within the N-terminal domain of RyR2, likely leading to a gain-of-function effect facilitating enhanced calcium ion release. Four generation cascade genetic and clinical screening was carried out. Results: Thirty-eight p.R176L variant carriers were identified of 94 family members with genetic testing, and 108 family members had clinical evaluations. Twelve carriers were symptomatic with previous syncope and 2 additional survivors of cardiac arrest were identified. Thirty-two had clinical features suggestive of CPVT. Of 52 noncarriers, 11 had experienced previous syncope with none exhibiting any clinical features of CPVT. A documented arrhythmic event rate of 2.89/1000 person-years across all carriers was calculated. Conclusion: The substantial variability in phenotype and the lower than previously reported penetrance is illustrative of the importance of exploring family variants beyond first-degree relatives. |
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MeSH term(s) | Adult ; Female ; Gain of Function Mutation ; Heart Arrest/diagnosis ; Heart Arrest/genetics ; Humans ; Male ; Pedigree ; Penetrance ; Protein Domains ; Ryanodine Receptor Calcium Release Channel/chemistry ; Ryanodine Receptor Calcium Release Channel/genetics ; Tachycardia, Ventricular/diagnosis ; Tachycardia, Ventricular/genetics |
Chemical Substances | RyR2 protein, human ; Ryanodine Receptor Calcium Release Channel |
Language | English |
Publishing date | 2020-01-28 |
Publishing country | United States |
Document type | Case Reports ; Journal Article |
ZDB-ID | 2734884-2 |
ISSN | 2324-9269 ; 2324-9269 |
ISSN (online) | 2324-9269 |
ISSN | 2324-9269 |
DOI | 10.1002/mgg3.1151 |
Database | MEDical Literature Analysis and Retrieval System OnLINE |
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