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Lin Y, Zhao T, He S, Huang J, Liu Q, Yang Z, Qin J, Yu N, Lu H, Lin X. Compound and heterozygous mutations of KCNQ1 in long QT syndrome with familial history of unexplained sudden death: Identified by analysis of whole exome sequencing and predisposing genes. Ann Noninvasive Electrocardiol 2019; 25:e12694. [PMID: 31565860 PMCID: PMC7358849 DOI: 10.1111/anec.12694] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/16/2019] [Accepted: 08/05/2019] [Indexed: 12/23/2022] Open
Abstract
Introduction Long QT syndrome (LQTS) increases the risk of life‐threatening arrhythmia in young individuals with structurally normal hearts. Sixteen genes such as the KCNQ1, KCNH2, and SCN5A have been reported for association with LQTS. Case presentation We identified the compound heterozygous mutations in the KCNQ1 gene at c. G527A (p.W176X) and c.G1765A (p.G589S) predicted as “damaging.” The in‐silico analysis showed that when compared to the characteristics of mRNA and protein of wild‐type KCNQ1, the mRNA of c.G527A mutation was significantly different in the centroid secondary structure. The subunit coded by W176X would lose the transmembrane domains S3–S6 and helices A‐D. The protein secondary structure of G589S was slightly shortened in helix structure; the protein physics‐chemical parameters of W176X and G589S significantly and slightly changed, respectively. Conclusions The compound heterozygous mutations of W176X and G589S coexisting in KCNQ1 gene of homologous chromosomes, resulting in more severe phenotype, are the likely pathogenic and genetic risks of LQTS and USD in this Chinese family.
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Affiliation(s)
- Yubi Lin
- Department of Cardiology and Cardiovascular Intervention, Interventional Medical Center, The Fifth Affiliated Hospital of Sun Yat-sen University, Zhuhai, China.,Guangdong Provincial Key Laboratory of Biomedical Imaging and Guangdong Provincial Engineering Research Center of Molecular Imaging, The Fifth Affiliated Hospital, Sun Yat-sen University, Zhuhai, China.,Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangdong Cardiovascular Institute, Guangdong Geriatrics Institute, Guangzhou, China
| | - Ting Zhao
- Department of Cardiology and Cardiovascular Intervention, Interventional Medical Center, The Fifth Affiliated Hospital of Sun Yat-sen University, Zhuhai, China
| | - Siqi He
- The Sixth Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Jiana Huang
- The Sixth Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | | | - Zhe Yang
- Department of Cardiology and Cardiovascular Intervention, Interventional Medical Center, The Fifth Affiliated Hospital of Sun Yat-sen University, Zhuhai, China
| | - Jiading Qin
- Department of Cardiology and Cardiovascular Intervention, Interventional Medical Center, The Fifth Affiliated Hospital of Sun Yat-sen University, Zhuhai, China
| | - Nan Yu
- Department of Clinical Laboratory, Zhujiang Hospital of Southern Medical University, Guangzhou, China
| | - Hongyun Lu
- Department of Endocrinology, The Fifth Affiliated Hospital of Sun Yat-sen University, Zhuhai, China
| | - Xiufang Lin
- Department of Cardiology and Cardiovascular Intervention, Interventional Medical Center, The Fifth Affiliated Hospital of Sun Yat-sen University, Zhuhai, China
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