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Related Experiment Video

Updated: Nov 30, 2025

Assessment of Selective mRNA Translation in Mammalian Cells by Polysome Profiling

Assessment of Selective mRNA Translation in Mammalian Cells by Polysome Profiling

Published on: October 28, 2014

FMRP links optimal codons to mRNA stability in neurons.

Huan Shu¹, Elisa Donnard², Botao Liu³

¹Program in Molecular Medicine, University of Massachusetts Medical School, Worcester, MA 01605; dr.huan.shu@gmail.com.

Proceedings of the National Academy of Sciences of the United States of America

|November 17, 2020

Summary

Fragile X syndrome (FXS) results from FMR1 gene inactivation and FMRP loss. FMRP stabilizes mRNAs with optimal codons, preventing their degradation and maintaining translational balance in the brain.

Keywords:

CPEB1 FMRP RNA decay codon optimality ribosome profiling

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Area of Science:

Neuroscience
Molecular Biology
Genetics

Background:

Fragile X syndrome (FXS) is a genetic disorder caused by the inactivation of the FMR1 gene.
This inactivation leads to the loss of Fragile X mental retardation protein (FMRP), an RNA-binding protein crucial for regulating gene expression.
FMRP's primary role involves repressing the translation of specific target messenger RNAs (mRNAs).

Purpose of the Study:

To investigate the translational dysregulation in the mouse brain cortex in the context of Fragile X syndrome.
To understand the role of FMRP in mRNA stability and translational control.
To elucidate the molecular mechanisms underlying FXS pathogenesis and potential therapeutic rescue strategies.

Main Methods:

Ribosome profiling and RNA sequencing were employed to analyze translational changes in the mouse brain cortex.
RNA metabolic labeling was used to assess mRNA degradation rates in FMRP-deficient neurons.
Analysis of FMRP binding targets and their correlation with codon optimality was performed.

Main Results:

Most observed changes in ribosome occupancy on mRNAs were primarily driven by alterations in transcript abundance.
Down-regulated mRNAs, critical for neuronal and synaptic functions, were significantly enriched for FMRP binding targets.
FMRP preferentially binds to mRNAs with optimal codons, suggesting a role in stabilizing these transcripts through translational machinery interactions.
In FMRP-deficient neurons, reduced mRNA levels were linked to increased degradation, correlated with codon optimality.

Conclusions:

FMRP plays a critical role in maintaining neuronal and synaptic function by regulating mRNA stability.
Codon optimality is a key factor in FMRP-mediated mRNA stabilization, impacting translational homeostasis.
Genetic rescue of FXS-like phenotypes involves restoring steady-state RNA levels and rebalancing translational control, highlighting FMRP's essential function.