The coexistence of a novel WNK1 variant and a copy number variation causes hereditary sensory and autonomic neuropathy type IIA
Abstract 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 “...
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BMC
2019-05-01
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| Series: | BMC Medical Genetics |
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| Online Access: | http://link.springer.com/article/10.1186/s12881-019-0828-5 |
| _version_ | 1818663951292956672 |
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| author | James Jiqi Wang Bo Yu Zongzhe Li |
| author_facet | James Jiqi Wang Bo Yu Zongzhe Li |
| author_sort | James Jiqi Wang |
| collection | DOAJ |
| description | Abstract 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. |
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| institution | Directory Open Access Journal |
| issn | 1471-2350 |
| language | English |
| last_indexed | 2024-12-17T05:25:00Z |
| publishDate | 2019-05-01 |
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| series | BMC Medical Genetics |
| spelling | doaj.art-ea779dcf649446598b1b3ab0b39f9daa2022-12-21T22:01:54ZengBMCBMC Medical Genetics1471-23502019-05-012011610.1186/s12881-019-0828-5The coexistence of a novel WNK1 variant and a copy number variation causes hereditary sensory and autonomic neuropathy type IIAJames Jiqi Wang0Bo Yu1Zongzhe Li2Division of Cardiology, Departments of Internal Medicine and Genetic Diagnosis Center, Tongji Hospital, Tongji Medical College, Huazhong University of Science and TechnologyDivision of Cardiology, Departments of Internal Medicine and Genetic Diagnosis Center, Tongji Hospital, Tongji Medical College, Huazhong University of Science and TechnologyDivision of Cardiology, Departments of Internal Medicine and Genetic Diagnosis Center, Tongji Hospital, Tongji Medical College, Huazhong University of Science and TechnologyAbstract 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.http://link.springer.com/article/10.1186/s12881-019-0828-5Hereditary sensory and autonomic neuropathiesHSAN IIAWNK1Targeted sequencingGenetic diagnosis |
| spellingShingle | James Jiqi Wang Bo Yu Zongzhe Li The coexistence of a novel WNK1 variant and a copy number variation causes hereditary sensory and autonomic neuropathy type IIA BMC Medical Genetics Hereditary sensory and autonomic neuropathies HSAN IIA WNK1 Targeted sequencing Genetic diagnosis |
| title | The coexistence of a novel WNK1 variant and a copy number variation causes hereditary sensory and autonomic neuropathy type IIA |
| title_full | The coexistence of a novel WNK1 variant and a copy number variation causes hereditary sensory and autonomic neuropathy type IIA |
| title_fullStr | The coexistence of a novel WNK1 variant and a copy number variation causes hereditary sensory and autonomic neuropathy type IIA |
| title_full_unstemmed | The coexistence of a novel WNK1 variant and a copy number variation causes hereditary sensory and autonomic neuropathy type IIA |
| title_short | The coexistence of a novel WNK1 variant and a copy number variation causes hereditary sensory and autonomic neuropathy type IIA |
| title_sort | coexistence of a novel wnk1 variant and a copy number variation causes hereditary sensory and autonomic neuropathy type iia |
| topic | Hereditary sensory and autonomic neuropathies HSAN IIA WNK1 Targeted sequencing Genetic diagnosis |
| url | http://link.springer.com/article/10.1186/s12881-019-0828-5 |
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