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Molecular and Phenotypical Findings of a Novel De Novo Syngap1 Gene Variant in an 11-Year-Old Iranian Boy With Intellectual Disability Publisher Pubmed



Mir A1 ; Song Y4 ; Lee H4 ; Nadeali Z1 ; Akbarian F1 ; Tabatabaiefar MA1, 2, 3
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. Pediatric Inherited Diseases Research Center, Research Institute for Primordial Prevention of Noncommunicable Disease, Isfahan University of Medical Sciences, Isfahan, Iran
  3. 3. GenTArget Corp (GTAC), Deputy of Research and Technology, Isfahan University of Medical Sciences, Isfahan, Iran
  4. 4. Divi-sion of Medical Genetics, 3Billion, Seoul, South Korea

Source: Lab Medicine Published:2024


Abstract

Objective: Intellectual developmental disorder (IDD) type 5 is an autosomal dominant (AD) disorder and is characterized by intellectual disability (ID), psychomotor developmental delay, variable autism phenotypes, microcephaly, and seizure. IDD can be caused by mutations in the SYNGAP1 gene, which encodes a Ras GTPase-activating protein. This study revealed a novel de novo nonsense variant in SYNGAP1. The identification of such variants is essential for genetic counseling in patients and their families. Methods: Exome sequencing implicated the causative variant. Sanger sequencing and cosegregation analyses were used to confirm the variant. Multiple in silico analysis tools were applied to interpret the variant using the American College of Medical Genetics and Genomics and the Association for Molecular Pathology guidelines. Results: The de novo NM_006772.3(SYNGAP1):c.3685C>T variant was identified in an 11-year-old boy with severe intellectual disability, neurodevelopmental delay, speech disorder, ataxia, specific dysmorphic facial features, and aggressive behavior. Conclusion: The current study findings expand the existing knowledge of variants in SYNGAP1 that have been previously associated with nonsyndromic intellectual disability and autism, extending the spectrum of phenotypes associated with this gene. The data have implications for genetic diagnosis and counseling in similar phenotypic presentations. © The Author(s) 2023. Published by Oxford University Press on behalf of American Society for Clinical Pathology. All rights reserved.
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