Related Experiment Video

Updated: Oct 19, 2025

A Robust Polymerase Chain Reaction-based Assay for Quantifying Cytosine-guanine-guanine Trinucleotide Repeats in Fragile X Mental Retardation-1 Gene
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A Robust Polymerase Chain Reaction-based Assay for Quantifying Cytosine-guanine-guanine Trinucleotide Repeats in Fragile X Mental Retardation-1 Gene

Published on: September 16, 2019

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Do Fragile X Syndrome and Other Intellectual Disorders Converge at Aberrant Pre-mRNA Splicing?

Sneha Shah1, Joel D Richter1

  • 1Program in Molecular Medicine, University of Massachusetts Medical School, Worcester, MA, United States.

Frontiers in Psychiatry
|September 27, 2021
PubMed

Insights

Fragile X Syndrome disrupts brain development by silencing the FMR1 gene, leading to widespread alternative splicing errors in mice. These splicing changes overlap with those in autism spectrum disorders, suggesting a common cause for cognitive impairments.

Area of Science:

  • Neuroscience
  • Genetics
  • Molecular Biology

Background:

  • Fragile X Syndrome (FXS) is a neurodevelopmental disorder caused by FMR1 gene silencing and FMRP protein loss.
  • FMRP normally regulates mRNA translation in the brain.
  • Aberrant mRNA processing is implicated in various neurodevelopmental disorders.

Purpose of the Study:

  • To investigate the impact of FMR1 gene deficiency on pre-mRNA alternative splicing in the mouse hippocampus.
  • To compare splicing dysregulation in FXS with that observed in autism spectrum disorders (ASDs) and other intellectual disability models.

Main Methods:

  • Transcriptome analysis (RNA sequencing) of hippocampus from Fmr1-deficient mice.
  • Comparative analysis of splicing patterns across different neurodevelopmental disorder models.

Main Results:

  • Widespread dysregulation of alternative splicing was identified in the Fmr1-deficient mouse hippocampus.
  • A significant overlap exists between splicing aberrations in FXS and those found in ASDs, PTEN hamartoma syndrome (PHTS), and Rett Syndrome (RTT).
  • Splicing changes may stem from chromatin modifications or altered splicing factors.

Conclusions:

  • Shared splicing aberrations across FXS, ASDs, PHTS, and RTT suggest a common molecular mechanism contributing to cognitive impairments.
  • Understanding these splicing convergences is critical for elucidating the pathophysiology of neurodevelopmental disorders.
Keywords:
Fragile X syndromealternative splicingautismgene regulationintellectual disability

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