Mutations of plakophilin-2 in Chinese with arrhythmogenic right ventricular dysplasia/cardiomyopathy.
Arrhythmogenic right ventricular dysplasia/cardiomyopathy (ARVD/C) is an inherited heart muscle disease associated with increased risks of sudden death, particularly in young, otherwise healthy, patients. The pathologic features are progressive myocardial atrophy and fibrofatty replacement. Plakophilin-2 (PKP2) is reported as the most common ARVD/C-causing gene in Western countries. In this study we aimed to determine the prevalence of PKP2 mutations in Chinese patients with ARVD/C and their phenotype characteristics. Genotype and phenotype were investigated in a cohort of 18 unrelated Chinese patients with a clinical diagnosis of ARVD/C. Direct sequencing of PKP2 led to the identification of 5 novel heterozygous mutations (R158K, Q211X, L419S, A793D, and N852fsX930) in 39% of patients (7 of 18) with ARVD/C. Among them, N852fsX930 was found in 3 unrelated young patients who presented with symptomatic ventricular tachyarrhythmia. Nevertheless, no significant difference could be detected between patients with ARVD/C with (n = 7) and without (n = 11) PKP2 mutations with regard to the phenotype characteristics and clinical outcomes. Decreased penetrance was prominent in family members. In conclusion, 5 novel PKP2 mutations were identified in a cohort of symptomatic Chinese patients with ARVD/C. N852fsX930 appeared to be a hot-spot mutation in which patients presented with a severe ARVD/C phenotype, and 2/3 had early onset of arrhythmic events. No significant difference was found in phenotype characteristics between patients with ARVD/C with and without PKP2 mutations. The decreased penetrance indicated that an ARVD/C diagnosis cannot solely rely on genotyping results.
Qiu
Xiaoliang
X
Heart Center, Peking University People's Hospital, Beijing, China.
Liu
Wenling
W
Hu
Dayi
D
Zhu
Tiangang
T
Li
Cuilan
C
Li
Lei
L
Guo
Chengjun
C
Liu
Xingpeng
X
Wang
Lei
L
Zheng
Hua
H
Wang
Chunling
C
Diao
Qing
Q
Shi
Dan
D
Zhan
Pingyun
P
Deng
Yuanming
Y
Liu
Kunshen
K
Wang
Yi
Y
Liu
Baomin
B
Liu
Hongming
H
Zhang
Li
L
D000328:Adult; D017668:Age of Onset; D019571:Arrhythmogenic Right Ventricular Dysplasia / Q000235:genetics* / Q000503:physiopathology; D009202:Cardiomyopathies / Q000235:genetics* / Q000503:physiopathology; D002681:China; D004562:Electrocardiography; D005260:Female; D005838:Genotype; D006579:Heterozygote; D006801:Humans; D008297:Male; D009154:Mutation / Q000235:genetics*; D010375:Pedigree; D010641:Phenotype; D051191:Plakophilins / Q000235:genetics*
D051191:Plakophilins