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Updated: Aug 17, 2025

In Vivo Functional Study of Disease-associated Rare Human Variants Using Drosophila
06:41

In Vivo Functional Study of Disease-associated Rare Human Variants Using Drosophila

Published on: August 20, 2019

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Rare EIF4A2 variants are associated with a neurodevelopmental disorder characterized by intellectual disability,

Maimuna S Paul1, Anna R Duncan2, Casie A Genetti3

  • 1Department of Pediatrics, Division of Neurology and Developmental Neuroscience, Baylor College of Medicine, Houston, TX, USA; Jan and Dan Duncan Neurological Research Institute, Texas Children's Hospital, Houston, TX, USA.

American Journal of Human Genetics
|December 17, 2022
PubMed

Insights

Rare variants in Eukaryotic initiation factor-4A2 (EIF4A2) cause a neurodevelopmental syndrome. Both loss-of-function and gain-of-function mechanisms contribute to disease, impacting development and potentially causing neurodegeneration.

Area of Science:

  • Genetics
  • Molecular Biology
  • Neuroscience

Background:

  • Eukaryotic initiation factor-4A2 (EIF4A2) is a DEAD-box RNA helicase crucial for mRNA translation and microRNA-mediated gene regulation.
  • Defects in EIF4A2 are implicated in cellular processes, but its role in human neurodevelopmental disorders is largely unexplored.

Purpose of the Study:

  • To investigate the role of EIF4A2 variants in a cohort of individuals with neurodevelopmental abnormalities.
  • To elucidate the pathogenic mechanisms underlying EIF4A2-associated genetic disorders.

Main Methods:

  • Clinical evaluation of 15 individuals from 14 families with de novo or inherited EIF4A2 variants.
  • Molecular modeling to predict the impact of variants on EIF4A2 protein structure.
  • In vivo functional studies using Drosophila melanogaster to assess variant pathogenicity.

Main Results:

  • Identified rare mono-allelic or bi-allelic EIF4A2 variants in individuals with global developmental delay, intellectual disability, hypotonia, epilepsy, and brain anomalies.
  • Molecular modeling suggested variants disrupt key protein domains.
  • Drosophila models exhibited variant-specific defects, and loss-of-function rescue assays indicated pathogenicity.

Conclusions:

  • EIF4A2 variants cause a novel genetic neurodevelopmental syndrome.
  • Both loss-of-function and gain-of-function mechanisms contribute to the observed phenotypes.
  • EIF4A2 is essential for normal neurodevelopment, and its dysfunction leads to a spectrum of neurological and developmental deficits.
Keywords:
DEAD-box proteinDrosophilaepilepsyneurodevelopmental disordertranscription factor

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