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(Circulation. 2007;116:1569-1576.)
© 2007 American Heart Association, Inc.

Molecular Cardiology

Expanding Spectrum of Human RYR2-Related Disease

New Electrocardiographic, Structural, and Genetic Features

Zahurul A. Bhuiyan, MD, PhD; Maarten P. van den Berg, MD, PhD; J. Peter van Tintelen, MD; Margreet T.E. Bink-Boelkens, MD, PhD; Ans C.P. Wiesfeld, MD, PhD; Marielle Alders, PhD; Alex V. Postma, PhD; Irene van Langen, MD, PhD; Marcel M.A.M. Mannens, PhD; Arthur A.M. Wilde, MD, PhD

From the Department of Clinical Genetics (Z.A.B., M.A., I.v.L., M.M.A.M.M.), and Heart Failure Research Center (A.V.P., A.A.M.W.), Academic Medical Center, University of Amsterdam, The Netherlands; Departments of Cardiology (M.P.v.d.B., A.C.P.W.), Clinical Genetics (J.P.v.T.), and Pediatric Cardiology (M.T.E.B.-B.), University Medical Center, University of Groningen, The Netherlands, and Interuniversity Cardiology Institute of The Netherlands (M.P.v.d.B., A.A.M.W.).

Correspondence to Dr Zahurul A. Bhuiyan, Department of Clinical Genetics, Academic Medical Centre, University of Amsterdam, The Netherlands. E-mail z.a.bhuiyan{at}amc.uva.nl

Received April 26, 2007; accepted July 20, 2007.

Background— Catecholaminergic polymorphic ventricular tachycardia is a disease characterized by ventricular arrhythmias elicited exclusively under adrenergic stress. Additional features include baseline bradycardia and, in some patients, right ventricular fatty displacement. The clinical spectrum is expanded by the 2 families described here.

Methods and Results— Sixteen members from 2 separate families have been clinically evaluated and followed over the last 15 years. In addition to exercise-related ventricular arrhythmias, they showed abnormalities in sinoatrial node function, as well as atrioventricular nodal function, atrial fibrillation, and atrial standstill. Left ventricular dysfunction and dilatation was present in several affected individuals. Linkage analysis mapped the disease phenotype to a 4-cM region on chromosome 1q42-q43. Conventional polymerase chain reaction–based screening did not reveal a mutation in either the Ryanodine receptor 2 gene (RYR2) or ACTN2, the most plausible candidate genes in the region of interest. Multiplex ligation-dependent probe amplification and long-range polymerase chain reaction identified a genomic deletion that involved RYR2 exon-3, segregated in all the affected family members (n=16) in these 2 unlinked families. Further investigation revealed that the genomic deletion occurred in both families as a result of Alu repeat–mediated polymerase slippage.

Conclusions— This is the first report on a large genomic deletion in RYR2, which leads to extended clinical phenotypes (eg, sinoatrial node and atrioventricular node dysfunction, atrial fibrillation, atrial standstill, and dilated cardiomyopathy). These features have not previously been linked to RYR2.

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