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A Novel Mettl5 Variant Disrupting a Donor Splice Site Leads to Primary Microcephaly-Related Intellectual Disability in an Iranian Family: Clinical Features and Literature Review Publisher



Shakarami F1 ; Nouri Z1, 2 ; Khanahmad H1 ; Ghazavi M3 ; Tabatabaiefar MA1, 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, 81746-73461, Iran
  2. 2. Department of Research and Development, Erythron Pathobiology Laboratory, Isfahan, 81647-76431, Iran
  3. 3. Department of Pediatric Neurology, Faculty of Medicine, Child Growth and Development Research Center, Isfahan University of Medical Sciences, Isfahan, 81746-7346, Iran
  4. 4. Pediatric Inherited Diseases Research Center, Research Institute for Primordial Prevention of Noncommunicable Disease, Isfahan University of Medical Sciences, Isfahan, 8174-5319, Iran

Source: Journal of Genetics Published:2023


Abstract

Intellectual disability (ID) is a highly heterogeneous disorder, affecting 1–3% of the world’s population, which is associated with a significant disorder in cognitive development, adaptive functioning and behavioural problems in human life. In this study, due to the genetic heterogeneity of the disease, the whole-exome sequencing (WES) was performed on a 13-year-old boy suffering from microcephaly. In addition, Sanger sequencing, cosegregation analysis, and structural modelling were performed to identify and verify the causative variant in the proband and obligate carriers in the family. WES revealed a novel, homozygote 10-bp deletion in the donor splice site of 2nd exon of METTL5 gene (NM_014168:c.223_224+8del), which was found segregating with the phenotype in the pedigree. This variant meets the criteria of being pathogenic according to the American College of Medical Genetics (ACMG) variant interpretation guideline. Up to now, four pathogenic homozygous variants of the METTL5 gene have been reported that are associated with ID. A comparison of the clinical characteristics of our patient with previously reported cases revealed variability in the disease severity and some clinical presentations, including overall growth, dysmorphic facial features and behavioural psychiatric manifestations. The clinical findings of the case reported in this study extend the spectrum of genetic variations and phenotypes associated with ID and provide a better insight of the disease pathogenesis. © 2023, Indian Academy of Sciences.
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