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Related Experiment Video

Updated: Apr 18, 2026

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

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

Published on: July 6, 2022

Disrupted glial-mediated synaptic refinement in Fragile X syndrome.

Lindsey Starr, Melissa Lee, Amy Vo

Biorxiv : the Preprint Server for Biology

|April 17, 2026

Summary

This summary is machine-generated.

Fragile X syndrome (FXS) impairs glial cells, leading to over-engulfment of synaptic material and altered neural circuit development. This study identifies glial-driven synaptic refinement defects as an early feature of FXS.

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Last Updated: Apr 18, 2026

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Generation and Characterization of Human Induced Pluripotent Stem Cell-derived Astrocytes Lacking Fragile X Messenger Ribonucleoprotein

Generation and Characterization of Human Induced Pluripotent Stem Cell-derived Astrocytes Lacking Fragile X Messenger Ribonucleoprotein

Published on: June 6, 2025

Area of Science:

Neuroscience
Genetics
Cell Biology

Background:

Fragile X syndrome (FXS) is a leading inherited cause of intellectual disability and autism.
Loss of fragile X mental retardation protein (FMRP) causes FXS, but its role in glial cells during neural development is unclear.

Purpose of the Study:

Investigate the role of FMRP in glial cells during early neural circuit development in FXS.
Identify cellular and molecular mechanisms underlying synaptic abnormalities in FXS models.

Main Methods:

Applied a multi-omic framework including single-cell transcriptomics, computational modeling, and lipidomics in Fmr1 knockout mice.
Utilized glial engulfment assays and analyzed the retinogeniculate pathway at postnatal day 7.

Main Results:

FXS model mice showed altered synaptic pruning, accelerated eye-specific segregation, and coordinated gene expression changes in microglia, astrocytes, and neurons.
Enhanced astrocyte-microglia signaling via Ephrin A and semaphorin pathways was observed.
FXS glial cells exhibited over-engulfment of synaptic material, linked to reduced EphA-associated lipids.

Conclusions:

Impaired glial-driven synaptic refinement is an early pathogenic mechanism in Fragile X syndrome.
Specific genes and pathways involved in glial synaptic pruning present potential therapeutic targets for FXS circuit development.