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Detection of Axonally Localized mRNAs in Brain Sections Using High-Resolution In Situ Hybridization
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Detection of Axonally Localized mRNAs in Brain Sections Using High-Resolution In Situ Hybridization

Published on: June 17, 2015

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miR-182 Regulates Slit2-Mediated Axon Guidance by Modulating the Local Translation of a Specific mRNA

Anaïs Bellon1, Archana Iyer2, Simone Bridi2

  • 1PDN Department, University of Cambridge, Cambridge CB23DY, UK.

Cell Reports
|February 2, 2017
PubMed

Insights

MicroRNAs (miRNAs) regulate gene expression in developing neurons. This study shows miR-182 controls cofilin-1 mRNA translation, guiding retinal ganglion cell axon pathfinding in response to guidance cues.

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Developmental Biology

Background:

  • Axon guidance during brain wiring relies on localized mRNA translation.
  • MicroRNAs (miRNAs) are key regulators of mRNA translation.
  • The specific mechanisms of mRNA selection for translation in axons are not fully understood.

Purpose of the Study:

  • To investigate the role of miRNAs in regulating specific mRNA translation in Xenopus laevis retinal ganglion cell (RGC) axons.
  • To identify key miRNAs involved in axon pathfinding and their molecular targets.

Main Methods:

  • Utilized Xenopus laevis model system for studying axon guidance.
  • Quantified miRNA expression in axons.
  • Assessed the impact of miRNA loss-of-function on axon targeting in vivo.
  • Investigated the interaction between miR-182, cofilin-1 mRNA, and Slit2 signaling.

Main Results:

  • miR-182 was identified as the most abundant miRNA in RGC axons.
  • Loss of miR-182 resulted in RGC axon targeting defects and impaired Slit2-induced growth cone repulsion.
  • miR-182 directly targets and silences cofilin-1 mRNA translation.
  • Slit2 signaling rapidly relieves miR-182-mediated repression of cofilin-1 mRNA translation without degrading the miRNA.

Conclusions:

  • miR-182 plays a critical role in RGC axon pathfinding by regulating cofilin-1 mRNA translation.
  • Guidance cues like Slit2 can dynamically modulate miRNA-mediated translational repression.
  • This provides a mechanism for cue-dependent, rapid translational control of cytoskeletal regulators during axon development.
Keywords:
Slit2axon guidancebrain wiringcofilingrowth conelocal translationmiR-182miRNAs

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