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Related Experiment Video

Updated: May 8, 2026

Dissecting Cell-Autonomous Function of Fragile X Mental Retardation Protein in an Auditory Circuit by In Ovo Electroporation
11:10

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Published on: July 6, 2022

Rescue of NMDAR-dependent synaptic plasticity in Fmr1 knock-out mice.

C A Bostrom1, N-M Majaess2, K Morch2

  • 1Division of Medical Sciences Department of Biology and.

Cerebral Cortex (New York, N.Y. : 1991)
|August 24, 2013
PubMed
Summary
This summary is machine-generated.

Fragile X Syndrome (FXS) involves intellectual disability due to loss of Fragile X mental retardation protein (FMRP). NMDAR co-agonist treatment rescues synaptic plasticity deficits in the dentate gyrus, suggesting a therapeutic avenue.

Keywords:
Fmr1 KOFragile X SyndromeLTPNMDARhippocampus

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Area of Science:

  • Neuroscience
  • Genetics
  • Developmental Biology

Background:

  • Fragile X Syndrome (FXS), the leading inherited intellectual disability, stems from the absence of Fragile X mental retardation protein (FMRP).
  • FMRP is crucial for mRNA transport and translation, impacting synaptic plasticity and potentially learning and memory.
  • The role of FMRP in synaptic plasticity across different brain regions remains incompletely understood.

Purpose of the Study:

  • To investigate the role of FMRP in N-methyl-D-aspartate receptor (NMDAR)-dependent synaptic plasticity in distinct hippocampal subregions.
  • To determine if FMRP loss affects NMDAR subunit expression and function in the hippocampus.
  • To explore the therapeutic potential of NMDAR co-agonists in ameliorating FXS-related synaptic deficits.

Main Methods:

  • Utilized the Fragile X mental retardation 1 (Fmr1) knockout mouse model.
  • Assessed NMDAR-dependent synaptic plasticity in the dentate gyrus (DG) and cornu ammonis area 1 (CA1) of the hippocampus.
  • Quantified NMDAR subunit levels (GluN1, GluN2A, GluN2B) and GluA1 phosphorylation (serine 831).
  • Administered NMDAR co-agonists (glycine or D-serine) to evaluate rescue effects.

Main Results:

  • Loss of FMRP impaired NMDAR-dependent synaptic plasticity specifically in the DG, not the CA1 region.
  • DG-specific deficits correlated with reduced NMDAR GluN1, GluN2A, GluN2B subunit levels and serine 831 GluA1 phosphorylation.
  • Treatment with glycine or D-serine successfully rescued the synaptic plasticity impairments in the DG of Fmr1 knockout mice.

Conclusions:

  • FMRP plays a critical, region-specific role in NMDAR-dependent synaptic plasticity within the hippocampus.
  • NMDAR dysfunction is implicated in the pathophysiology of Fragile X Syndrome.
  • Targeting NMDARs with co-agonists presents a promising therapeutic strategy for FXS.