In the Right Place at the Right Time: miRNAs as Key Regulators in Developing Axons

Area of Science:

• Neuroscience
• Molecular Biology
• Genetics

Background:

• Axon development relies on local protein synthesis.
• Extracellular signals guide neuronal circuit formation.
• Local translation machinery supports axonal autonomy.

Purpose of the Study:

• To review the role of microRNAs (miRNAs) in regulating local translation during axon development.
• To survey the axonal miRNA repertoire and its regulatory mechanisms.
• To highlight the significance of miRNAs in axon growth and guidance.

Main Methods:

• Review of current literature on axonal miRNA profiling.
• Analysis of molecular mechanisms of miRNA action.
• Synthesis of experimental evidence on miRNA-mediated regulation of local translation.

Main Results:

• Identification of a putative axonal miRNA signature.
• Elucidation of two paradigms of miRNA-mediated regulation: inhibition relief and activation.
• Demonstration of miRNAs orchestrating spatiotemporal control of local translation.

Conclusions:

• MicroRNAs are critical regulators of local translation in axons.
• miRNAs fine-tune protein synthesis in response to extracellular cues.
• A decade of research underscores miRNAs' central role in axon development.