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Genetic predictors of sick sinus syndrome. Mol Biol Rep 2021; 48:5355-5362. [PMID: 34195885 DOI: 10.1007/s11033-021-06517-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2021] [Accepted: 06/25/2021] [Indexed: 10/21/2022]
Abstract
Sick sinus syndrome (SSS) encompasses a group of conduction disorders characterized by the inability of sinoatrial node to perform its pacemaker function. Our aim was to identify genetic predictors of SSS in a prospective cohort of patients admitted to the clinic for pacemaker implantation using single-locus and multilocus approaches. We performed genotyping for polymorphic markers of CLCNKA (rs10927887), SCN10A (rs6795970), FNDC3B (rs9647379), MIR146A (rs2910164), SYT10 (rs7980799), MYH6 (rs365990), and KCNE1 (rs1805127) genes in the group of 284 patients with SSS and 243 healthy individuals. Associations between the studied loci and SSS were tested using logistic regression under recessive genetic model using sex and age as covariates. Multilocus analysis was performed using Markov chain Monte Carlo method implemented in the APSampler program. Correction for multiple testing was performed using Benjamini-Hochberg procedure. We detected an individual association between KCNE1 rs1805127*A allele and SSS in the total study group (OR 0.43, PFDR = 0.028) and in the subgroup of patients with 2nd or 3rd degree sinoatrial block (OR 0.17, PFDR = 0.033), and identified seven allelic patterns associated with the disease. SCN10A rs6795970*T and MIR146A rs2910164*C alleles were present in all seven combinations associated with SSS. The highest risk of SSS was conferred by the combination SCN10A rs6795970*T+FNDC3B rs9647379*C+MIR146A rs2910164*C+SYT10 rs7980799*C+KCNE1 rs1805127*G (OR 2.98, CI 1.77-5.00, P = 1.27 × 10-5, PFDR = 0.022). Our findings suggest that KCNE1 rs1805127 polymorphism may play a role in susceptibility to sinoatrial node dysfunction, particularly presenting as 2nd or 3rd degree sinoatrial block, and the risk-modifying effect of other studied loci is better detected using multilocus approach.
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Liu Z, Zheng R, Grushko MJ, Uversky VN, McDonald TV. Functionally Aberrant Mutant KCNQ1 With Intermediate Heterozygous and Homozygous Phenotypes. Can J Cardiol 2018; 34:1174-1184. [PMID: 30170673 DOI: 10.1016/j.cjca.2018.06.015] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2018] [Revised: 06/19/2018] [Accepted: 06/26/2018] [Indexed: 10/28/2022] Open
Abstract
BACKGROUND Deleterious mutations in KCNQ1 may lead to an autosomal dominant form of long QT syndrome (LQTS) (Romano-Ward) or autosomal recessive form (Jervell and Lange-Nielsen). Both are associated with severe ventricular tachyarrhythmias due to the reduction of the slowly activating delayed rectifier K+ current (IKs). Our objective was to investigate the functional consequences of KCNQ1-R562S mutation in an atypical form of KCNQ1-linked LQTS. METHODS Mutant KCNQ1-R562S was analyzed via confocal imaging, surface biotinylation assays, co-immunoprecipitation, phosphatidylinositol-4,5-bisphosphate pulldown test, whole-cell patch clamp, and computational intrinsic disorder analyses. RESULTS Protein expression, assembly with KCNE1, and trafficking to the surface membrane of KCNQ1-R562S were comparable with wild-type channels. The most significant functional effect of the R562S mutation was a depolarizing shift in the voltage dependence of activation that was dependent on association with KCNE1. The biophysical abnormality was only partially dominant over coexpressed wild-type channels. R562S mutation impaired C-terminal association with membrane phosphatidylinositol-4,5-bisphosphate. These changes led to compromised rate-related accumulation of repolarizing current that is an important property of normal IKs. CONCLUSIONS KCNQ1-R562S mutation reduces effective IKs due to channel gating alteration with a mild clinical expression in the heterozygous state due to minimal dominant phenotype. In the homozygous state, it is exhibited with a moderately severe LQTS phenotype due to the incomplete absence of IKs.
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Affiliation(s)
- Zhenning Liu
- Department of Emergency Medicine, Shengjing Hospital of China Medical University, Shenyang, China
| | - Renjian Zheng
- Departments of Medicine and Molecular Pharmacology, Albert Einstein College of Medicine, Bronx, New York, USA
| | | | - Vladimir N Uversky
- Department of Molecular Medicine, and USF Health Byrd Alzheimer's Research Institute, Morsani College of Medicine, University of South Florida, Tampa, Florida, USA
| | - Thomas V McDonald
- Departments of Medicine and Molecular Pharmacology, Albert Einstein College of Medicine, Bronx, New York, USA; Department of Cardiovascular Sciences, Morsani College of Medicine, University of South Florida, Tampa, Florida, USA.
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Yokoyama R, Kinoshita K, Hata Y, Abe M, Matsuoka K, Hirono K, Kano M, Nakazawa M, Ichida F, Nishida N, Tabata T. A mutant HCN4 channel in a family with bradycardia, left bundle branch block, and left ventricular noncompaction. Heart Vessels 2018; 33:802-819. [DOI: 10.1007/s00380-018-1116-6] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/29/2017] [Accepted: 01/05/2018] [Indexed: 01/09/2023]
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Allelic Complexity in Long QT Syndrome: A Family-Case Study. Int J Mol Sci 2017; 18:ijms18081633. [PMID: 28749435 PMCID: PMC5578023 DOI: 10.3390/ijms18081633] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2017] [Revised: 07/13/2017] [Accepted: 07/21/2017] [Indexed: 12/17/2022] Open
Abstract
Congenital long QT syndrome (LQTS) is associated with high genetic and allelic heterogeneity. In some cases, more than one genetic variant is identified in the same (compound heterozygosity) or different (digenic heterozygosity) genes, and subjects with multiple pathogenic mutations may have a more severe disease. Standard-of-care clinical genetic testing for this and other arrhythmia susceptibility syndromes improves the identification of complex genotypes. Therefore, it is important to distinguish between pathogenic mutations and benign rare variants. We identified four genetic variants (KCNQ1-p.R583H, KCNH2-p.C108Y, KCNH2-p.K897T, and KCNE1-p.G38S) in an LQTS family. On the basis of in silico analysis, clinical data from our family, and the evidence from previous studies, we analyzed two mutated channels, KCNQ1-p.R583H and KCNH2-p.C108Y, using the whole-cell patch clamp technique. We found that KCNQ1-p.R583H was not associated with a severe functional impairment, whereas KCNH2-p.C108Y, a novel variant, encoded a non-functional channel that exerts dominant-negative effects on the wild-type. Notably, the common variants KCNH2-p.K897T and KCNE1-p.G38S were previously reported to produce more severe phenotypes when combined with disease-causing alleles. Our results indicate that the novel KCNH2-C108Y variant can be a pathogenic LQTS mutation, whereas KCNQ1-p.R583H, KCNH2-p.K897T, and KCNE1-p.G38S could be LQTS modifiers.
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Yamaguchi Y, Mizumaki K, Hata Y, Sakamoto T, Nakatani Y, Kataoka N, Ichida F, Inoue H, Nishida N. Latent pathogenicity of the G38S polymorphism of KCNE1 K + channel modulator. Heart Vessels 2016; 32:186-192. [PMID: 27255646 DOI: 10.1007/s00380-016-0859-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/31/2016] [Accepted: 05/27/2016] [Indexed: 01/08/2023]
Abstract
KCNE1 encodes a modulator of KCNQ1 and KCNH2 channels. Although KCNE1(G38S), a single-nucleotide polymorphism (SNP) causing a G38S substitution in KCNE1, is found frequently, whether and how this SNP causes long QT syndrome (LQTS) remains unclear. We evaluated rate-dependent repolarization dynamics using Holter electrocardiogram (ECG) to assess the pathogenicity of KCNE1(G38S). Forty-five patients exhibiting long QT intervals, as assessed by their baseline ECGs, and 16 control subjects were enrolled. KCNE1(G38S) carriers were identified using genome sequencing. LQTS patients were classified into LQT1 or LQT2 using genetic analysis or epinephrine test. QT-RR relations were determined using 24-h Holter ECG recordings. Among the 15 patients (33.3 %) with KCNE1(G38S), four patients without any mutations or amino acid changes in other major cardiac ion channels were categorized as KCNE1(G38S) carriers. In the QT-RR regression lines, the QT-RR slope was greater in the KCNE1(G38S) carriers and the LQT2 patients (0.215 ± 0.021 and 0.207 ± 0.032, respectively) than in the LQT1 patients (0.163 ± 0.014, P < 0.05) and the control subjects (0.135 ± 0.025, P < 0.001). The calculated QT intervals at an RR interval of 1200 ms were longer in the KCNE1(G38S) carriers and LQT1 and LQT2 patients than in the control subjects. Patients with KCNE1(G38S) had a rate-dependent repolarization abnormality similar to patients with LQT2 and, therefore, may have a potential risk to develop lethal arrhythmias.
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Affiliation(s)
- Yoshiaki Yamaguchi
- Second Department of Internal Medicine, Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, 2630 Sugitani, Toyama, 930-0194, Japan
| | - Koichi Mizumaki
- Clinical Research and Ethics Center, University of Toyama, 2630 Sugitani, Toyama, 930-0194, Japan.
| | - Yukiko Hata
- Department of Legal Medicine, Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, 2630 Sugitani, Toyama, 930-0194, Japan
| | - Tamotsu Sakamoto
- Second Department of Internal Medicine, Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, 2630 Sugitani, Toyama, 930-0194, Japan
| | - Yosuke Nakatani
- Second Department of Internal Medicine, Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, 2630 Sugitani, Toyama, 930-0194, Japan
| | - Naoya Kataoka
- Second Department of Internal Medicine, Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, 2630 Sugitani, Toyama, 930-0194, Japan
| | - Fukiko Ichida
- Department of Pediatrics, Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, 2630 Sugitani, Toyama, 930-0194, Japan
| | - Hiroshi Inoue
- Second Department of Internal Medicine, Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, 2630 Sugitani, Toyama, 930-0194, Japan
| | - Naoki Nishida
- Department of Legal Medicine, Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, 2630 Sugitani, Toyama, 930-0194, Japan
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Kanters JK, Olesen MS, Christiansen M. KCNE1 G38S polymorphism is not the cause of long QT syndrome. J Electrocardiol 2016; 49:249-50. [DOI: 10.1016/j.jelectrocard.2015.12.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2015] [Indexed: 01/26/2023]
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Yamaguchi Y, Mizumaki K, Hata Y, Inoue H. Abnormal repolarization dynamics in a patient with KCNE1(G38S) who presented with torsades de pointes. J Electrocardiol 2015; 49:94-8. [PMID: 26520166 DOI: 10.1016/j.jelectrocard.2015.10.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2015] [Indexed: 11/29/2022]
Abstract
Risk of G38S, major KCNE1 polymorphism [KCNE1(G38S)], for long QT syndrome (LQTS) remains unclear. A 72-year-old woman was admitted with recurrent torsades de pointes (TdP). She had remarkable QT prolongation (corrected QT interval 568 ms) under conditions of hypokalemia and hypomagnesemia. After correction of this electrolytic imbalance, TdP was suppressed and metoprolol was started. The QT-RR slope in 24-hour Holter electrocardiogram was steep and this enhanced bradycardia-dependent QT prolongation was similar to that in LQTS. She carried KCNE1(G38S). Patients with KCNE1(G38S) could have similar potential risk of ventricular arrhythmia as with LQTS. Analysis of QT-RR relationship could also evaluate the latent arrhythmogenicity of KCNE1(G38S).
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Affiliation(s)
- Yoshiaki Yamaguchi
- Second Department of Internal Medicine, Graduate School of Medicine, University of Toyama, Toyama, Japan
| | - Koichi Mizumaki
- Clinical Research and Ethics Center, University of Toyama, Toyama, Japan.
| | - Yukiko Hata
- Legal Medicine, University of Toyama, Toyama, Japan
| | - Hiroshi Inoue
- Second Department of Internal Medicine, Graduate School of Medicine, University of Toyama, Toyama, Japan
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Hisajima N, Hata Y, Kinoshita K, Fukushima T, Nishida N, Kano M, Tabata T. The Susceptibilities of Human Ether-à-Go-Go-Related Gene Channel with the G487R Mutation to Arrhythmogenic Factors. Biol Pharm Bull 2015; 38:781-4. [DOI: 10.1248/bpb.b14-00630] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Nozomi Hisajima
- Laboratory for Neural Information Technology, Graduate School of Science and Engineering, University of Toyama
| | - Yukiko Hata
- Department of Legal Medicine, Graduate School of Medical and Pharmaceutical Sciences, University of Toyama
| | - Koshi Kinoshita
- Department of Legal Medicine, Graduate School of Medical and Pharmaceutical Sciences, University of Toyama
| | - Toshiki Fukushima
- Laboratory for Neural Information Technology, Graduate School of Science and Engineering, University of Toyama
| | - Naoki Nishida
- Department of Legal Medicine, Graduate School of Medical and Pharmaceutical Sciences, University of Toyama
| | - Masanobu Kano
- Department of Neurophysiology, Graduate School of Medicine, The University of Tokyo
| | - Toshihide Tabata
- Laboratory for Neural Information Technology, Graduate School of Science and Engineering, University of Toyama
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Hancox JC, Du C, El Harchi A, Zhang H. Modification of KCNH2-encoded cardiac potassium channels by KCNE1 polymorphism. Circ J 2014; 78:2330. [PMID: 25008780 DOI: 10.1253/circj.cj-14-0513] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Jules C Hancox
- School of Physiology and Pharmacology and Cardiovascular Research Laboratories, Medical Sciences Building, University of Bristol
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Tabata T, Yamaguchi Y, Hata Y, Ichida F, Mori H. Modification of <i>KCNH2</i>-Encoded Cardiac Potassium Channels by KCNE1 Polymorphism. Circ J 2014; 78:2331. [DOI: 10.1253/circj.cj-14-0654] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Toshihide Tabata
- Laboratory for Neural Information Technology, Graduate School of Sciences and Engineering, University of Toyama
| | | | - Yukiko Hata
- Department of Legal Medicine, University of Toyama
| | | | - Hisashi Mori
- Department of Molecular Neurosciences, University of Toyama
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