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Updated: Jun 26, 2025

Visualizing Axonal Growth Cone Collapse and Early Amyloid β Effects in Cultured Mouse Neurons
Published on: October 30, 2018
Putting the brakes on axonal branching.
Ismael Ferrer1, Chadni Sanyal2, Marie-Jo Moutin2
1Department of Cell and Developmental Biology, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA.
Researchers discovered a new signaling pathway controlling axon branching in mouse neurons. Glycogen synthase kinase 3β (GSK3β) phosphorylation of microtubule-associated protein 1B (MAP1B) limits branching by affecting microtubule tyrosination.
Area of Science:
- Neuroscience
- Cell Biology
- Molecular Biology
Background:
- Axon branching is crucial for neural circuit formation.
- Understanding the regulation of axon branching is key to developmental neuroscience.
Purpose of the Study:
- To identify novel regulators of axon branching in mouse layer 2/3 callosal projection neurons.
- To elucidate the molecular mechanisms underlying axon branching control.
Main Methods:
- Precise sparse labeling techniques were used.
- Spatiotemporally controlled genetic manipulations were employed.
- Investigated the role of glycogen synthase kinase 3β (GSK3β) and microtubule-associated protein 1B (MAP1B).
Main Results:
- A cell-autonomous signaling pathway regulating axon branching was identified.
- GSK3β phosphorylation of MAP1B was found to restrict interstitial axon branching.
- This restriction is mediated by modulation of microtubule (MT) tyrosination status.
Conclusions:
- GSK3β-mediated MAP1B phosphorylation is a novel regulator of axon branching.
- Microtubule tyrosination is a key factor in controlling axon branching patterns.
- The findings provide insights into the molecular mechanisms of neuronal development.
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