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IQSEC2-related encephalopathy in male children: Novel mutations and phenotypes

The isoleucine–glutamine (IQ) motif and Sec7 domain-containing protein 2 (IQSEC2) gene, located at Xp11. 2, are associated with nervous system diseases, such as epilepsy, autism, and intellectual disabilities. Gender-related differences in the severity of phenotype severity have been described previ...

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Autores principales: Liu, Xinting, Zhang, Shan, Wan, Lin, Zhang, Xiaoli, Wang, Haiping, Zhang, Hongwei, Zhu, Gang, Liang, Yan, Yan, Huimin, Zhang, Bo, Yang, Guang
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Frontiers Media S.A. 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9577604/
https://www.ncbi.nlm.nih.gov/pubmed/36267700
http://dx.doi.org/10.3389/fnmol.2022.984776
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author Liu, Xinting
Zhang, Shan
Wan, Lin
Zhang, Xiaoli
Wang, Haiping
Zhang, Hongwei
Zhu, Gang
Liang, Yan
Yan, Huimin
Zhang, Bo
Yang, Guang
author_facet Liu, Xinting
Zhang, Shan
Wan, Lin
Zhang, Xiaoli
Wang, Haiping
Zhang, Hongwei
Zhu, Gang
Liang, Yan
Yan, Huimin
Zhang, Bo
Yang, Guang
author_sort Liu, Xinting
collection PubMed
description The isoleucine–glutamine (IQ) motif and Sec7 domain-containing protein 2 (IQSEC2) gene, located at Xp11. 2, are associated with nervous system diseases, such as epilepsy, autism, and intellectual disabilities. Gender-related differences in the severity of phenotype severity have been described previously. Here, we report the details of seven male children with IQSEC2 mutations from different families. During this investigation, we explored the relationship between the genotype and phenotype of IQSEC2 mutations; to do so, we recruited seven children with pathogenic/likely pathogenic IQSEC2 mutations who were diagnosed with global developmental delay and/or epilepsy. Their clinical features were assessed, and Trio-based whole-exome sequencing (trio WES) was conducted in seven pedigrees. A variety of algorithms and computational tools were used to calculate the pathogenicity, protein stability, conservation, side chain properties, and protein-protein interactions of mutated proteins. The seven patients ranged in age from 18 months to 5 years. Among them, six children were found to have both developmental delay and epilepsy, and one child only exhibited developmental delay. Four novel mutations (c.316C > T, c.443_4 44dup, c.3235T > C, and c.1417G > T) were newly reported. Two patients did not have truncated aberrant proteins caused by missense mutations. Still, they did have severe phenotypes, such as early-onset epilepsy in infancy, because the mutations were located in domains like the pleckstrin homology and IQ calmodulin-binding motif domains. The bioinformatics analysis also proved that missense mutations may be located in the functional region, which affects protein stability and is harmful. In summary, severe phenotypes, such as early-onset epilepsy in infancy, occur in male patients with a missense mutation in specific domains (e.g., pleckstrin homology and IQ calmodulin-binding motif domains). Some female individuals with IQSEC2 mutations may be asymptomatic because of the skewed inactivation of the X chromosome.
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spelling pubmed-95776042022-10-19 IQSEC2-related encephalopathy in male children: Novel mutations and phenotypes Liu, Xinting Zhang, Shan Wan, Lin Zhang, Xiaoli Wang, Haiping Zhang, Hongwei Zhu, Gang Liang, Yan Yan, Huimin Zhang, Bo Yang, Guang Front Mol Neurosci Molecular Neuroscience The isoleucine–glutamine (IQ) motif and Sec7 domain-containing protein 2 (IQSEC2) gene, located at Xp11. 2, are associated with nervous system diseases, such as epilepsy, autism, and intellectual disabilities. Gender-related differences in the severity of phenotype severity have been described previously. Here, we report the details of seven male children with IQSEC2 mutations from different families. During this investigation, we explored the relationship between the genotype and phenotype of IQSEC2 mutations; to do so, we recruited seven children with pathogenic/likely pathogenic IQSEC2 mutations who were diagnosed with global developmental delay and/or epilepsy. Their clinical features were assessed, and Trio-based whole-exome sequencing (trio WES) was conducted in seven pedigrees. A variety of algorithms and computational tools were used to calculate the pathogenicity, protein stability, conservation, side chain properties, and protein-protein interactions of mutated proteins. The seven patients ranged in age from 18 months to 5 years. Among them, six children were found to have both developmental delay and epilepsy, and one child only exhibited developmental delay. Four novel mutations (c.316C > T, c.443_4 44dup, c.3235T > C, and c.1417G > T) were newly reported. Two patients did not have truncated aberrant proteins caused by missense mutations. Still, they did have severe phenotypes, such as early-onset epilepsy in infancy, because the mutations were located in domains like the pleckstrin homology and IQ calmodulin-binding motif domains. The bioinformatics analysis also proved that missense mutations may be located in the functional region, which affects protein stability and is harmful. In summary, severe phenotypes, such as early-onset epilepsy in infancy, occur in male patients with a missense mutation in specific domains (e.g., pleckstrin homology and IQ calmodulin-binding motif domains). Some female individuals with IQSEC2 mutations may be asymptomatic because of the skewed inactivation of the X chromosome. Frontiers Media S.A. 2022-10-03 /pmc/articles/PMC9577604/ /pubmed/36267700 http://dx.doi.org/10.3389/fnmol.2022.984776 Text en Copyright © 2022 Liu, Zhang, Wan, Zhang, Wang, Zhang, Zhu, Liang, Yan, Zhang and Yang. 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 Molecular Neuroscience
Liu, Xinting
Zhang, Shan
Wan, Lin
Zhang, Xiaoli
Wang, Haiping
Zhang, Hongwei
Zhu, Gang
Liang, Yan
Yan, Huimin
Zhang, Bo
Yang, Guang
IQSEC2-related encephalopathy in male children: Novel mutations and phenotypes
title IQSEC2-related encephalopathy in male children: Novel mutations and phenotypes
title_full IQSEC2-related encephalopathy in male children: Novel mutations and phenotypes
title_fullStr IQSEC2-related encephalopathy in male children: Novel mutations and phenotypes
title_full_unstemmed IQSEC2-related encephalopathy in male children: Novel mutations and phenotypes
title_short IQSEC2-related encephalopathy in male children: Novel mutations and phenotypes
title_sort iqsec2-related encephalopathy in male children: novel mutations and phenotypes
topic Molecular Neuroscience
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9577604/
https://www.ncbi.nlm.nih.gov/pubmed/36267700
http://dx.doi.org/10.3389/fnmol.2022.984776
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