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Original Articles

Desmoglein-2 and Desmocollin-2 Mutations in Dutch Arrhythmogenic Right Ventricular Dysplasia/Cardiomypathy Patients

Results From a Multicenter Study

Zahurul A. Bhuiyan, MD, PhD; Jan D.H. Jongbloed, PhD; Jasper van der Smagt, MD; Paola M. Lombardi, PhD; Ans C.P. Wiesfeld, MD, PhD; Marcel Nelen, PhD; Meyke Schouten, MD, PhD; Roselie Jongbloed, PhD; Moniek G.P.J. Cox, MD; Marleen van Wolferen, MSc; Luz M. Rodriguez, MD, PhD; Isabelle C. van Gelder, MD, PhD; Hennie Bikker, PhD; Albert J.H. Suurmeijer, MD, PhD; Maarten P. van den Berg, MD, PhD; Marcel M.A.M. Mannens, PhD; Richard N.W. Hauer, MD, PhD; Arthur A.M. Wilde, MD, PhD and J. Peter van Tintelen, MD, PhD

From the Department of Clinical Genetics (Z.A.B., P.M.L., H.B., M.M.A.M.), Heart Failure Research Centre (A.A.M.W.), Academic Medical Center, University of Amsterdam, The Netherlands; Departments of Genetics (J.D.H.J., M.v.W., J.P.v.T.), Cardiology (A.C.P.W., I.C.v.G., M.P.v.d.B.), and Pathology (A.J.H.S.), University Medical Center Groningen, University of Groningen, The Netherlands; Departments of Clinical Genetics (J.v.d.S., M.N.) and Cardiology (M.G.P.J.C., R.N.W.H.), University Medical Center Utrecht, The Netherlands; Departments of Clinical Genetics (M.S., R.J.) and Cardiology (L.M.R.), University of Maastricht, and Cardiovascular Research Institute, Maastricht, The Netherlands; and Interuniversity Cardiology Institute of the Netherlands (ICIN) (M.G.P.J.C., I.C.v.G., M.P.v.d.B., R.N.W.H., A.A.M.W., J.P.v.T.), Utrecht, The Netherlands.

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

Received December 10, 2008; accepted July 7, 2009.

Background— This study aimed to evaluate the prevalence and type of mutations in the major desmosomal genes, Plakophilin-2 (PKP2), Desmoglein-2 (DSG2), and Desmocollin-2 (DSC2), in arrhythmogenic right ventricular dysplasia/cardiomyopathy (ARVD/C) patients. We also aimed to distinguish relevant clinical and ECG parameters.

Methods and Results— Clinical evaluation was performed according to the Task Force Criteria (TFC). We analyzed the genes in (a) 57 patients who fulfilled the ARVD/C TFC (TFC+), (b) 28 patients with probable ARVD/C (1 major and 1 minor, or 3 minor criteria), and (c) 31 patients with 2 minor or 1 major criteria. In the TFC+ ARVD/C group, 23 patients (40%) had PKP2 mutations, 4 (7%) had DSG2 mutations, and 1 patient (2%) carried a mutation in DSC2, whereas 1 patient (2%) had a mutation in both DSG2 and DSC2. Among the DSG2 and DSC2 mutation-positive TFC+ ARVD/C probands, 2 carried compound heterozygous mutations and 1 had digenic mutations. In probable ARVD/C patients and those with 2 minor or 1 major criteria for ARVD/C, mutations were less frequent and they were all heterozygous. Negative T waves in the precordial leads were observed more (P<0.002) among mutation carriers than noncarriers and in particular in PKP2 mutation carriers.

Conclusions— Mutations in DSG2 and DSC2 are together less prevalent (10%) than PKP2 mutations (40%) in Dutch TFC+ ARVD/C patients. Interestingly, biallelic or digenic DSC2 and/or DSG2 mutations are frequently identified in TFC+ ARVD/C patients, suggesting that a single mutation is less likely to cause a full-blown ARVD/C phenotype. Negative T waves on ECG were prevalent among mutation carriers (P<0.002).

Key Words: arrhythmia • cardiomyopathy • desmosomes • genetics

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CLINICAL PERSPECTIVE

Passed away on June 21, 2009.

The online-only Data Supplement is available at http://circgenetics.ahajournals.org/cgi/content/full/CIRCGENETICS.109.839829.

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