Related Experiment Video

Updated: Jul 16, 2025

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

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FMRP Long-Range Transport and Degradation Are Mediated by Dynlrb1 in Sensory Neurons

Sara Emad El-Agamy1, Laurent Guillaud1, Keiko Kono2

  • 1Molecular Neuroscience Unit, Okinawa Institute of Science and Technology Graduate University, Kunigami-gun, Okinawa, Japan.

Molecular & Cellular Proteomics : MCP
|September 22, 2023
PubMed

Insights

Dynein light chain roadblock 1 (Dynlrb1) regulates fragile X mental retardation protein (FMRP) transport in sensory axons. Dynlrb1 controls FMRP function, impacting mRNA translation and neuronal survival in neurological disorders.

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Cell Biology

Background:

  • Fragile X mental retardation protein (FMRP) is crucial for neuronal development and function.
  • FMRP regulates mRNA localization and translation via phase-separated condensates trafficked in axons.
  • Axonal transport of FMRP is vital for neuronal survival and linked to neurological diseases.

Purpose of the Study:

  • To investigate the role of dynein light chain roadblock 1 (Dynlrb1) in FMRP axonal transport and function.
  • To elucidate the mechanism of FMRP retrograde axonal trafficking.
  • To understand how Dynlrb1 regulates FMRP-mediated translation.

Main Methods:

  • Studied FMRP association with endolysosomal organelles in sensory axons.
  • Investigated Dynlrb1-dependent dynein-mediated FMRP retrograde transport.
  • Utilized Dynlrb1 silencing to assess effects on FMRP granules and mRNA translation.

Main Results:

  • FMRP associates with endolysosomal organelles and undergoes Dynlrb1-dependent retrograde transport in axons.
  • Dynlrb1 silencing leads to FMRP granule accumulation.
  • Repressed translation of microtubule-associated protein 1b (MAP1B) mRNA was observed upon Dynlrb1 silencing.

Conclusions:

  • Dynein light chain roadblock 1 (Dynlrb1) is a critical regulator of FMRP function.
  • Dynlrb1 controls FMRP transport and targeted degradation, influencing localized mRNA translation.
  • Findings provide insights into FMRP regulation and its implications for neurological disorders.
Keywords:
FMRPRNA granulesRNA-binding proteindyneinmRNA translation

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