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Related Experiment Video

Updated: Oct 2, 2025

Dissecting Cell-Autonomous Function of Fragile X Mental Retardation Protein in an Auditory Circuit by In Ovo Electroporation
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Impaired Functional Connectivity Underlies Fragile X Syndrome.

Lital Gildin1,2, Rossana Rauti3, Ofir Vardi3,4

  • 1Wolfe PGD Stem Cell Lab, Racine IVF Unit, Lis Maternity Hospital Tel-Aviv Sourasky Medical Center, Tel-Aviv 64239, Israel.

International Journal of Molecular Sciences
|February 26, 2022
PubMed
Summary

Fragile X syndrome (FXS) impairs neuronal networks. FXS-induced neurons show reduced complexity and altered network synchronicity, explaining intellectual dysfunction in FXS.

Keywords:
Fragile X syndromeMEAdisease modelingelectrophysiologyhuman embryonic stem cellsneural differentiation

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Area of Science:

  • Neuroscience
  • Genetics
  • Developmental Biology

Background:

  • Fragile X syndrome (FXS) is the leading cause of inherited intellectual disability.
  • FXS results from FMR1 gene silencing, but its impact on neuronal development is unclear.

Purpose of the Study:

  • To investigate the functional impact of the FMR1 mutation on human neuronal networks.
  • To compare neuronal network development and function in FXS and control iNs.

Main Methods:

  • Generated isogenic human embryonic stem cell-derived induced neurons (iNs) with and without the FXS mutation.
  • Utilized high-throughput imaging, multi-electrode array (MEA) analysis, and cross-correlation analysis.

Main Results:

  • FXS-iNs exhibited smaller cell bodies and reduced arborization compared to controls.
  • FXS neuronal networks showed hyperexcitability and increased spontaneous burst-firing.
  • FXS networks displayed significantly reduced synchronicity, indicating impaired network connectivity.

Conclusions:

  • Induced neurons from FXS patients reveal distinct network properties.
  • Reduced neuronal network synchronicity in FXS may underlie intellectual dysfunction.
  • This model provides insights into FXS pathogenesis and potential therapeutic targets.