Genetic analysis of 20 patients with hypomyelinating leukodystrophy by trio-based whole-exome sequencing

Hypomyelinating leukodystrophies (HLDs) are a rare group of disorders characterized by myelin deficit of the brain-based on MRI. Here, we studied 20 patients with unexplained HLD to uncover their genetic etiology through whole-exome sequencing (WES). Trio-based WES was performed for 20 unresolved HL...

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Veröffentlicht in:Journal of human genetics 2021-08, Vol.66 (8), p.761-768
Hauptverfasser: Yan, Huifang, Ji, Haoran, Kubisiak, Thomas, Wu, Ye, Xiao, Jiangxi, Gu, Qiang, Yang, Yanling, Xie, Han, Ji, Taoyun, Gao, Kai, Li, Dongxiao, Xiong, Hui, Shi, Zhen, Li, Ming, Zhang, Yuehua, Duan, Ruoyu, Bao, Xinhua, Jiang, Yuwu, Burmeister, Margit, Wang, Jingmin
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container_end_page 768
container_issue 8
container_start_page 761
container_title Journal of human genetics
container_volume 66
creator Yan, Huifang
Ji, Haoran
Kubisiak, Thomas
Wu, Ye
Xiao, Jiangxi
Gu, Qiang
Yang, Yanling
Xie, Han
Ji, Taoyun
Gao, Kai
Li, Dongxiao
Xiong, Hui
Shi, Zhen
Li, Ming
Zhang, Yuehua
Duan, Ruoyu
Bao, Xinhua
Jiang, Yuwu
Burmeister, Margit
Wang, Jingmin
description Hypomyelinating leukodystrophies (HLDs) are a rare group of disorders characterized by myelin deficit of the brain-based on MRI. Here, we studied 20 patients with unexplained HLD to uncover their genetic etiology through whole-exome sequencing (WES). Trio-based WES was performed for 20 unresolved HLDs families after genetic tests for the PLP1 duplication and a panel of 115 known leukodystrophy-related genes. Variants in both known genes that related to HLDs and promising candidate genes were analyzed. Minigene splicing assay was conducted to confirm the effect of splice region variant. All 20 patients were diagnosed with HLDs clinically based on myelin deficit on MRI and impaired motor ability. Through WES, in 11 of 20 trios, 15 causative variants were detected in seven genes TUBB4A, POLR1C, POLR3A, SOX10, TMEM106B, DEGS1, and TMEM63A. The last three genes have just been discovered. Of 15 variants, six were novel. Using minigene splicing assay, splice variant POLR3A c.1770 + 5 G > C was proved to disrupt the normal splicing of intron 13 and led to a premature stop codon at position 618 (p.(P591Vfs*28)). Our analysis determined the molecular diagnosis of 11 HLDs patients. It emphasizes the heterogenicity of HLDs, the diagnostic power of trio-based WES for HLDs. Comprehensive analysis including a focus on candidate genes helps to discover novel disease-causing genes, determine the diagnosis for the first time, and improve the yield of WES. Moreover, novel mutations identified in TUBB4A, POLR3A, and POLR1C expand the mutation spectrum of these genes.
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Here, we studied 20 patients with unexplained HLD to uncover their genetic etiology through whole-exome sequencing (WES). Trio-based WES was performed for 20 unresolved HLDs families after genetic tests for the PLP1 duplication and a panel of 115 known leukodystrophy-related genes. Variants in both known genes that related to HLDs and promising candidate genes were analyzed. Minigene splicing assay was conducted to confirm the effect of splice region variant. All 20 patients were diagnosed with HLDs clinically based on myelin deficit on MRI and impaired motor ability. Through WES, in 11 of 20 trios, 15 causative variants were detected in seven genes TUBB4A, POLR1C, POLR3A, SOX10, TMEM106B, DEGS1, and TMEM63A. The last three genes have just been discovered. Of 15 variants, six were novel. Using minigene splicing assay, splice variant POLR3A c.1770 + 5 G &gt; C was proved to disrupt the normal splicing of intron 13 and led to a premature stop codon at position 618 (p.(P591Vfs*28)). 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subjects Alternative splicing
Diagnosis
Etiology
Genetic analysis
Genetic screening
Leukodystrophy
Magnetic resonance imaging
Mutation
Myelin
Myelin proteolipid protein
Nonsense mutation
Sox10 protein
Splicing
Stop codon
title Genetic analysis of 20 patients with hypomyelinating leukodystrophy by trio-based whole-exome sequencing
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