NOVEL HOMOZYGOUS VARIANT OF TBC1 DOMAIN FAMILY MEMBER 8 GENE IN FOUR LIBYAN SIBLINGS WITH AUTISTIC SPECTRUM DISORDER AND INTELLECTUAL DISABILITY WITHOUT EPILEPSY

Adel M Zeglam ,Suad Al-Hmadi

doi:10.22159/ijms.2021.v9i6.41029

Adel M Zeglam , Suad Al-Hmadi

Open Access

https://doi.org/10.22159/ijms.2021.v9i6.41029

Copy DOI

Abstract

Objective: Recent progress in genetic analysis and investigations have enabled researchers to identify potential genetic changes that may play a role in ASD. The number of genes connected with autism is growing. Whole exome sequencing(WES) identified the homozygous TBC1D8 variant. Aim to report for the first time a TBC1D8 missense variant (c.1883G>A, p. (Arg628Gln) in 4 Libyan children (3 homozygous,1 heterozygous) with severe neurodevelopmental phenotypes ASD and intellectual disability ID . Based on the data of HGMD and ClinVar, variants in only a few autosomal recessive intellectual disability ARID genes seem to be reported frequently. Method: Molecular genetic analysis of (WES) was carried out on blood samples from these children. The outcome of the genetic investigations was interpreted within the context of clinical finding, family history, and suspected mode of inheritance. Results: The number of genes associated with autism is increasing. WES identified the TBC1D8 variant. According to the longest isoform (NM_001102426.1),the nomenclature of this variant is c.1883G>A, p. (Arg628Gln) in TBC1D8 which leads to an amino acid exchange. This variant has not previously reported or described in the literature (PubMed, HGMD). Conclusion: we have provided evidence for a connection between TBC1D8 variant and ASD and ID; however, this evidence should be considered preliminary in the context of a single case report and such findings need to be replicated to gain insight in order to determine if ASD and ID are a characteristic of this variant.

Highlights

TBC1 Domain Family Member 8 (TBC1D8) is a Protein Coding gene
According to the longest isoform (NM_001102426.1),the nomenclature of this variant is c.1883G>A, p. (Arg628Gln) in TBC1D8 which leads to an amino acid exchange
Conclusion: we have provided evidence for a connection between TBC1D8 variant and ASD and ID; this evidence should be considered preliminary in the context of a single case report and such findings need to be replicated to gain insight in order to determine if ASD and ID are a characteristic of this variant

Summary

Introduction

TBC1 Domain Family Member 8 (TBC1D8) is a Protein Coding gene. Cell cycle is one of the gene-associated pathways. Identified gene networks that are commonly disrupted in IDand other neurodevelopmental disorders are composed of genes that are highly dosage-sensitive. These pathways might indicate other neurobiological activities than those that are affected by recessive mutations [6]. According to the American Association on Intellectual and Developmental Disabilities, Intellectual disability is at present is regarded as “a disability associated with significant restrictions both in intellectual functioning and in adaptive behavior as expressed in conceptual, social, and practical adaptive skills. This disability originates before age 18” [7]. Well-known single-gene disorders associated with ASD are Fragile X syndrome, Rettsyndrome, MECP2 duplication, Angelman syndrome, and Tuberous sclerosis [9]

Methods

Results

Discussion

Conclusion