Targeted next-generation sequencing of candidate genes reveals novel mutations in patients with dilated cardiomyopathy

Zhao,Yue; Feng,Yue; Zhang,Yun-Mei; Ding,Xiao-Xue; Song,Yu-Zhu; Zhang,A-Mei; Liu,Li; Zhang,Hong; Ding,Jia-Huan; Xia,Xue-Shan

doi:10.3892/ijmm.2015.2361

Targeted next-generation sequencing of candidate genes reveals novel mutations in patients with dilated cardiomyopathy

Authors:
- Yue Zhao
- Yue Feng
- Yun-Mei Zhang
- Xiao-Xue Ding
- Yu-Zhu Song
- A-Mei Zhang
- Li Liu
- Hong Zhang
- Jia-Huan Ding
- Xue-Shan Xia
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Affiliations: Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, P.R. China, Faculty of Life Science and Technology, Research Center for Molecular Medicine in Yunnan Province, Kunming University of Science and Technology, Kunming 650500, P.R. China, Department of Cardiology, The First Hospital of Yunnan Province, Kunming 650034, P.R. China
Published online on: October 7, 2015 https://doi.org/10.3892/ijmm.2015.2361
Pages: 1479-1486
Copyright: © Zhao et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

Dilated cardiomyopathy (DCM) is a major cause of sudden cardiac death and heart failure, and it is characterized by genetic and clinical heterogeneity, even for some patients with a very poor clinical prognosis; in the majority of cases, DCM necessitates a heart transplant. Genetic mutations have long been considered to be associated with this disease. At present, mutations in over 50 genes related to DCM have been documented. This study was carried out to elucidate the characteristics of gene mutations in patients with DCM. The candidate genes that may cause DCM include MYBPC3, MYH6, MYH7, LMNA, TNNT2, TNNI3, MYPN, MYL3, TPM1, SCN5A, DES, ACTC1 and RBM20. Using next-generation sequencing (NGS) and subsequent mutation confirmation with traditional capillary Sanger sequencing analysis, possible causative non-synonymous mutations were identified in ~57% (12/21) of patients with DCM. As a result, 7 novel mutations (MYPN, p.E630K; TNNT2, p.G180A; MYH6, p.R1047C; TNNC1, p.D3V; DES, p.R386H; MYBPC3, p.C1124F; and MYL3, p.D126G), 3 variants of uncertain significance (RBM20, p.R1182H; MYH6, p.T1253M; and VCL, p.M209L), and 2 known mutations (MYH7, p.A26V and MYBPC3, p.R160W) were revealed to be associated with DCM. The mutations were most frequently found in the sarcomere (MYH6, MYBPC3, MYH7, TNNC1, TNNT2 and MYL3) and cytoskeletal (MYPN, DES and VCL) genes. As genetic testing is a useful tool in the clinical management of disease, testing for pathogenic mutations is beneficial to the treatment of patients with DCM and may assist in predicting disease risk for their family members before the onset of symptoms.

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