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A Novel De Novo Frameshift Variant in the Chd2 Gene Related to Intellectual and Developmental Disability, Seizures and Speech Problems Publisher Pubmed



Mir A1 ; Song Y2 ; Lee H2 ; Nadeali Z1 ; Tabatabaiefar MA1, 3, 4
Authors
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Authors Affiliations
  1. 1. Department of Genetics and Molecular Biology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran
  2. 2. Division of Medical Genetics, 3Billion Inc, Seoul, South Korea
  3. 3. Pediatric Inherited Diseases Research Center, Research Institute for Primordial Prevention of Noncommunicable Disease, Isfahan University of Medical Sciences, Isfahan, Iran
  4. 4. GenTArget Corp (GTAC), Deputy of Research and Technology, Isfahan University of Medical Sciences, Isfahan, Iran

Source: Molecular Genetics and Genomic Medicine Published:2024


Abstract

Background: The chromodomain helicase DNA-binding protein 2 (CHD2) is a member of the ATP-dependent chromatin remodelling family of proteins, which are critical for the assembly and regulation of chromatin. De novo variants and deletions in the CHD2 gene have been associated with childhood-onset developmental and epileptic encephalopathies type 94 (DEE 94). This study reports a novel deleterious de novo heterozygous frameshift insertion variant in the CHD2 gene. Methods: The causative variant was diagnosed using whole-exome sequencing. Sanger sequencing and cosegregation analysis were applied to confirm the candidate variant. Multiple in silico analysis tools were employed to interpret the variant using the American College of Medical Genetics and Genomics and the Association for Molecular Pathology guidelines. Results: A de novo deleterious variant, NM_001271.4:c.1570dup (NP_001262.3:p.Ser524PhefsTer30), in the CHD2 gene, was identified in a 16-year-old boy with an intellectual and developmental disability, seizures and speech problems. The de novo occurrence of the variant was confirmed by segregation analysis in the family. Conclusion: The findings of this study expand the existing knowledge of variants of the CHD2 gene and provide a detailed phenotype associated with this gene. These data could have implications for genetic diagnosis and counselling in similar conditions. Moreover, this information could be useful for therapeutic purposes, including the proper administration of medication to control epilepsy. © 2023 The Authors. Molecular Genetics & Genomic Medicine published by Wiley Periodicals LLC.
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