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The coexistence of a novel WNK1 variant and a copy number variation causes hereditary sensory and autonomic neuropathy type IIA

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单位： [a]Division of Cardiology,Departments of Internal Medicine,Genetic Diagnosis Center,Tongji Hospital,Tongji Medical College,Huazhong University of Science and Technology,Wuhan,430030,China [b]Hubei Key Laboratory of Genetics and Molecular Mechanisms of Cardiological Disorders, Huazhong University of Science and Technology, Wuhan, China

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关键词： Genetic diagnosis Hereditary sensory and autonomic neuropathies HSAN IIA Targeted sequencing WNK1

摘要：

Background: Hereditary sensory and autonomic neuropathy (HSAN) type II is a group of extremely rare autosomal recessive neurological disorders with heterogeneous clinical and genetic characteristics. Methods: We performed high-depth next-generation targeted sequencing using a custom-ordered "HSAN" panel, covering WNK1, NTRK1, NGF, SPTLC1 and IKBKAP genes, to identify pathogenic variants of the proband as well as the family members. We also performed whole exome sequencing to further investigate the potential occurrence of additional pathogenic variants in genes that were not covered by the "HSAN" panel. Quantitative real-time PCR was used to identify pathogenic copy number variations (CNVs) and to analyze the mRNA level of WNK1 gene of the family. Western blot analysis was performed to evaluate the WNK1 protein expression level. Results: After sequencing, a novel nonsense variant (c.2747 T > G, p.Leu916Ter) in exon 9 of WNK1 gene was identified in two patients (hemizygous) and their mother (heterozygous). This variant is absent in all public databases as well as in 600 Han Chinese healthy controls. The region of this variant is evolutionary highly conserved. Furthermore, by quantitative real-time PCR using DNA of the pedigree, we revealed a large deletion containing the whole WNK1 gene in two patients. The WNK1 expression levels of the patients were significantly reduced. Conclusions: Our study firstly revealed that the coexistence of a novel WNK1 nonsense variant and a CNV resulted in HSAN type IIA in a Han Chinese family. © 2019 The Author(s).

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出版当年[2018]版：

大类 | 4 区医学

小类 | 4 区遗传学

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第一作者：

第一作者单位： [a]Division of Cardiology,Departments of Internal Medicine,Genetic Diagnosis Center,Tongji Hospital,Tongji Medical College,Huazhong University of Science and Technology,Wuhan,430030,China

通讯作者：

通讯机构： [a]Division of Cardiology,Departments of Internal Medicine,Genetic Diagnosis Center,Tongji Hospital,Tongji Medical College,Huazhong University of Science and Technology,Wuhan,430030,China [b]Hubei Key Laboratory of Genetics and Molecular Mechanisms of Cardiological Disorders, Huazhong University of Science and Technology, Wuhan, China

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