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Visualization of the Axonal Projection Pattern of Embryonic Motor Neurons in Drosophila
Published on: June 16, 2017
Dystroglycan organizes axon guidance cue localization and axonal pathfinding
Kevin M Wright1, Krissy A Lyon, Haiwen Leung
1The Solomon H. Snyder Department of Neuroscience and Howard Hughes Medical Institute, The Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA.
Neuron
|December 11, 2012
Summary
Glycosylated dystroglycan, regulated by B3gnt1 and ISPD, is crucial for proper axon guidance in the developing nervous system. It directly interacts with the Slit/Robo pathway, ensuring correct axon tract formation.
Area of Science:
- Neuroscience
- Developmental Biology
- Molecular Biology
Background:
- Precise axon guidance is essential for nervous system development.
- The distribution of axon guidance cues dictates neural circuit formation.
Purpose of the Study:
- Identify novel genes involved in axon guidance.
- Investigate the role of dystroglycan glycosylation in axon development.
Main Methods:
- Murine forward genetic screen.
- Analysis of B3gnt1, ISPD, and dystroglycan mutant mice.
- Biochemical assays to determine protein interactions.
Main Results:
- B3gnt1 and ISPD are required for dystroglycan glycosylation in vivo.
- Mutations in B3gnt1, ISPD, and dystroglycan cause defects in longitudinal axon tracts.
- Dystroglycan directly binds Slit and is necessary for Slit localization.
Conclusions:
- Glycosylated dystroglycan is a novel determinant of axon guidance.
- Dystroglycan plays a critical role in regulating the distribution and function of Slit guidance cues.
- These findings reveal a new mechanism controlling axon pathfinding in the mammalian nervous system.
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