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Identification of a Novel de Novo Variant in the SYT2 Gene Causing a Rare Type of Distal Hereditary Motor Neuropathy

Objective: To report the first de novo missense mutation in the SYT2 gene causing distal hereditary motor neuropathy. Methods: Genetic testing was carried out, including clinical exome sequencing for the proband and Sanger sequencing for the proband and his parents. We described the clinical and ele...

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Autores principales: Mironovich, Olga, Dadali, Elena, Malmberg, Sergey, Markova, Tatyana, Ryzhkova, Oxana, Poliakov, Aleksander
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7690400/
https://www.ncbi.nlm.nih.gov/pubmed/33105646
http://dx.doi.org/10.3390/genes11111238
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author Mironovich, Olga
Dadali, Elena
Malmberg, Sergey
Markova, Tatyana
Ryzhkova, Oxana
Poliakov, Aleksander
author_facet Mironovich, Olga
Dadali, Elena
Malmberg, Sergey
Markova, Tatyana
Ryzhkova, Oxana
Poliakov, Aleksander
author_sort Mironovich, Olga
collection PubMed
description Objective: To report the first de novo missense mutation in the SYT2 gene causing distal hereditary motor neuropathy. Methods: Genetic testing was carried out, including clinical exome sequencing for the proband and Sanger sequencing for the proband and his parents. We described the clinical and electrophysiological features found in the patient. Results: We reported a proband with a new de novo missense mutation, c.917C>T (p.Ser306Leu), in the C2B domain of SYT2. The clinical presentation was similar to that of phenotypes described in previous studies. A notable feature in our study was normal electrophysiological testing results of the patient. Conclusions: In this study we reinforced the association between SYT2 mutations and distal hereditary motor neuropathy. We also described the clinical presentation of the patient carrying this pathogenic variant and provided unusual results of electrophysiological testing. The results showed that a diagnosis of SYT2-associated neuropathy should be based on the similarity of clinical manifestations, rather than the results of electrophysiological testing.
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spelling pubmed-76904002020-11-27 Identification of a Novel de Novo Variant in the SYT2 Gene Causing a Rare Type of Distal Hereditary Motor Neuropathy Mironovich, Olga Dadali, Elena Malmberg, Sergey Markova, Tatyana Ryzhkova, Oxana Poliakov, Aleksander Genes (Basel) Case Report Objective: To report the first de novo missense mutation in the SYT2 gene causing distal hereditary motor neuropathy. Methods: Genetic testing was carried out, including clinical exome sequencing for the proband and Sanger sequencing for the proband and his parents. We described the clinical and electrophysiological features found in the patient. Results: We reported a proband with a new de novo missense mutation, c.917C>T (p.Ser306Leu), in the C2B domain of SYT2. The clinical presentation was similar to that of phenotypes described in previous studies. A notable feature in our study was normal electrophysiological testing results of the patient. Conclusions: In this study we reinforced the association between SYT2 mutations and distal hereditary motor neuropathy. We also described the clinical presentation of the patient carrying this pathogenic variant and provided unusual results of electrophysiological testing. The results showed that a diagnosis of SYT2-associated neuropathy should be based on the similarity of clinical manifestations, rather than the results of electrophysiological testing. MDPI 2020-10-22 /pmc/articles/PMC7690400/ /pubmed/33105646 http://dx.doi.org/10.3390/genes11111238 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Case Report
Mironovich, Olga
Dadali, Elena
Malmberg, Sergey
Markova, Tatyana
Ryzhkova, Oxana
Poliakov, Aleksander
Identification of a Novel de Novo Variant in the SYT2 Gene Causing a Rare Type of Distal Hereditary Motor Neuropathy
title Identification of a Novel de Novo Variant in the SYT2 Gene Causing a Rare Type of Distal Hereditary Motor Neuropathy
title_full Identification of a Novel de Novo Variant in the SYT2 Gene Causing a Rare Type of Distal Hereditary Motor Neuropathy
title_fullStr Identification of a Novel de Novo Variant in the SYT2 Gene Causing a Rare Type of Distal Hereditary Motor Neuropathy
title_full_unstemmed Identification of a Novel de Novo Variant in the SYT2 Gene Causing a Rare Type of Distal Hereditary Motor Neuropathy
title_short Identification of a Novel de Novo Variant in the SYT2 Gene Causing a Rare Type of Distal Hereditary Motor Neuropathy
title_sort identification of a novel de novo variant in the syt2 gene causing a rare type of distal hereditary motor neuropathy
topic Case Report
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7690400/
https://www.ncbi.nlm.nih.gov/pubmed/33105646
http://dx.doi.org/10.3390/genes11111238
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