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A Novel Frame-Shift Mutation in SCNN1B Identified in a Chinese Family Characterized by Early-Onset Hypertension

BACKGROUND: Liddle syndrome is a form of monogenic hypertension caused by mutations in the three homologous subunits of the epithelial sodium channels (ENaCs), α, β, and γ. It is characterized by early-onset refractory hypertension, hypokalemia, low renin activity, and hypoaldosteronism. In this stu...

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Autores principales: Lu, Yi-Ting, Liu, Xin-Chang, Zhou, Ze-Ming, Zhang, Di, Sun, Lin, Zhang, Ying, Fan, Peng, Zhang, Lin, Liu, Ya-Xin, Luo, Fang, Zhou, Xian-Liang
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Frontiers Media S.A. 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9239342/
https://www.ncbi.nlm.nih.gov/pubmed/35774371
http://dx.doi.org/10.3389/fcvm.2022.896564
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author Lu, Yi-Ting
Liu, Xin-Chang
Zhou, Ze-Ming
Zhang, Di
Sun, Lin
Zhang, Ying
Fan, Peng
Zhang, Lin
Liu, Ya-Xin
Luo, Fang
Zhou, Xian-Liang
author_facet Lu, Yi-Ting
Liu, Xin-Chang
Zhou, Ze-Ming
Zhang, Di
Sun, Lin
Zhang, Ying
Fan, Peng
Zhang, Lin
Liu, Ya-Xin
Luo, Fang
Zhou, Xian-Liang
author_sort Lu, Yi-Ting
collection PubMed
description BACKGROUND: Liddle syndrome is a form of monogenic hypertension caused by mutations in the three homologous subunits of the epithelial sodium channels (ENaCs), α, β, and γ. It is characterized by early-onset refractory hypertension, hypokalemia, low renin activity, and hypoaldosteronism. In this study, we report a novel frame-shift mutation in SCNN1B responsible for Liddle syndrome in a Chinese family. METHODS: DNA samples were collected from all participants. Whole-exome sequencing was performed in the proband to detect possible causative variants. Sanger sequencing was then conducted in the other family members to verify the candidate variant, and in 100 patients with hypertension and 100 normotensive controls to exclude population genetic polymorphism. RESULTS: We identified a novel frame-shift mutation (c.1691_1693delinsG) in SCNN1B that was responsible for Liddle syndrome in this family. This mutation leads to the substitution of Arg in place of Gln at codon site 564 and generates a new stop codon at 592, influencing the crucial PY motif and resulting in reduced inactivation of the ENaCs. Aside from the proband, eight family members carried the mutation. Intra-familial phenotypic heterogeneity was observed in the blood pressure and serum potassium levels. Amiloride therapy combined with a low sodium diet is effective to alleviate the symptoms of patients with Liddle syndrome. CONCLUSION: c.1691_1693delinsG, a novel frame-shift mutation in the β subunit of ENaC, was identified in a Chinese family with Liddle syndrome by whole-exome sequencing. Phenotypic heterogeneity can make diagnosis of Liddle syndrome difficult on the basis of clinical or biochemical characteristics alone. Genetic analysis is a useful tool allowing timely and accurate diagnosis of Liddle syndrome and playing a guiding role in precise treatment of the disease.
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spelling pubmed-92393422022-06-29 A Novel Frame-Shift Mutation in SCNN1B Identified in a Chinese Family Characterized by Early-Onset Hypertension Lu, Yi-Ting Liu, Xin-Chang Zhou, Ze-Ming Zhang, Di Sun, Lin Zhang, Ying Fan, Peng Zhang, Lin Liu, Ya-Xin Luo, Fang Zhou, Xian-Liang Front Cardiovasc Med Cardiovascular Medicine BACKGROUND: Liddle syndrome is a form of monogenic hypertension caused by mutations in the three homologous subunits of the epithelial sodium channels (ENaCs), α, β, and γ. It is characterized by early-onset refractory hypertension, hypokalemia, low renin activity, and hypoaldosteronism. In this study, we report a novel frame-shift mutation in SCNN1B responsible for Liddle syndrome in a Chinese family. METHODS: DNA samples were collected from all participants. Whole-exome sequencing was performed in the proband to detect possible causative variants. Sanger sequencing was then conducted in the other family members to verify the candidate variant, and in 100 patients with hypertension and 100 normotensive controls to exclude population genetic polymorphism. RESULTS: We identified a novel frame-shift mutation (c.1691_1693delinsG) in SCNN1B that was responsible for Liddle syndrome in this family. This mutation leads to the substitution of Arg in place of Gln at codon site 564 and generates a new stop codon at 592, influencing the crucial PY motif and resulting in reduced inactivation of the ENaCs. Aside from the proband, eight family members carried the mutation. Intra-familial phenotypic heterogeneity was observed in the blood pressure and serum potassium levels. Amiloride therapy combined with a low sodium diet is effective to alleviate the symptoms of patients with Liddle syndrome. CONCLUSION: c.1691_1693delinsG, a novel frame-shift mutation in the β subunit of ENaC, was identified in a Chinese family with Liddle syndrome by whole-exome sequencing. Phenotypic heterogeneity can make diagnosis of Liddle syndrome difficult on the basis of clinical or biochemical characteristics alone. Genetic analysis is a useful tool allowing timely and accurate diagnosis of Liddle syndrome and playing a guiding role in precise treatment of the disease. Frontiers Media S.A. 2022-06-14 /pmc/articles/PMC9239342/ /pubmed/35774371 http://dx.doi.org/10.3389/fcvm.2022.896564 Text en Copyright © 2022 Lu, Liu, Zhou, Zhang, Sun, Zhang, Fan, Zhang, Liu, Luo and Zhou. https://creativecommons.org/licenses/by/4.0/This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
spellingShingle Cardiovascular Medicine
Lu, Yi-Ting
Liu, Xin-Chang
Zhou, Ze-Ming
Zhang, Di
Sun, Lin
Zhang, Ying
Fan, Peng
Zhang, Lin
Liu, Ya-Xin
Luo, Fang
Zhou, Xian-Liang
A Novel Frame-Shift Mutation in SCNN1B Identified in a Chinese Family Characterized by Early-Onset Hypertension
title A Novel Frame-Shift Mutation in SCNN1B Identified in a Chinese Family Characterized by Early-Onset Hypertension
title_full A Novel Frame-Shift Mutation in SCNN1B Identified in a Chinese Family Characterized by Early-Onset Hypertension
title_fullStr A Novel Frame-Shift Mutation in SCNN1B Identified in a Chinese Family Characterized by Early-Onset Hypertension
title_full_unstemmed A Novel Frame-Shift Mutation in SCNN1B Identified in a Chinese Family Characterized by Early-Onset Hypertension
title_short A Novel Frame-Shift Mutation in SCNN1B Identified in a Chinese Family Characterized by Early-Onset Hypertension
title_sort novel frame-shift mutation in scnn1b identified in a chinese family characterized by early-onset hypertension
topic Cardiovascular Medicine
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9239342/
https://www.ncbi.nlm.nih.gov/pubmed/35774371
http://dx.doi.org/10.3389/fcvm.2022.896564
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