Ryanodine receptor (RyR2) mutations in sudden cardiac death: studies in extended pedigrees and phenotypic characterization in vitro

Autor: Anetta Wronska, Heikki Swan, Annukka Marjamaa, Kimmo Kontula, Päivi J. Laitinen-Forsblom, Lauri Toivonen
Rok vydání: 2009
Předmět:
Adult
Male
medicine.medical_specialty
Adolescent
Cardiomyopathy
Mutation
Missense
030204 cardiovascular system & hematology
In Vitro Techniques
medicine.disease_cause
Catecholaminergic polymorphic ventricular tachycardia
Ryanodine receptor 2
Sudden death
Sudden cardiac death
Membrane Potentials
03 medical and health sciences
Young Adult
0302 clinical medicine
Risk Factors
Internal medicine
medicine
Missense mutation
Humans
Family
cardiovascular diseases
030304 developmental biology
Aged
0303 health sciences
Mutation
business.industry
Ryanodine receptor
Ryanodine Receptor Calcium Release Channel
Middle Aged
medicine.disease
3. Good health
Pedigree
Endocrinology
Death
Sudden
Cardiac
Phenotype
cardiovascular system
Tachycardia
Ventricular
Female
Cardiology and Cardiovascular Medicine
business
Cardiomyopathies
Zdroj: International journal of cardiology. 147(2)
ISSN: 1874-1754
Popis: Background Catecholaminergic polymorphic ventricular tachycardia caused by mutations in the RyR2 gene manifests as severe arrhythmias, and may provide a candidate for sudden cardiac deaths. Methods We screened 19 victims of SCD for mutations in the RyR2 gene by direct sequencing, and analyzed DNAs from available family members and from 300 controls. Medico-legal investigations were conducted by experienced pathologists. We performed resting ECG, cardiac ultrasonography, exercise stress test, epinephrine test and 24-hour ambulatory ECG recording to related mutation carriers ( n =17). The single channel recordings of the mutant RyR2s were conducted in planar lipid bilayers, and the open probabilities were determined by sequential addition of CaCl 2 to the cis -side. Results We identified two novel RyR2 missense mutations (G2145R and R3570W) in three victims of SCD. The surviving carriers of these mutations exhibited only minor, if any structural abnormalities, and two carriers of R3570W showed ventricular arrhythmias predominantly at rest. Single channel recordings revealed a gain-of-function defect in native unphosphorylated R3570W and a similar but milder defect in native G2145R. Conclusions RyR2 mutations manifesting as a gain-of-function defect in vitro may be detectable in some cases of SCD. Not all RyR2 mutations lead to a uniform, highly penetrant CPVT phenotype.
Databáze: OpenAIRE
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