Plexin Signaling and Motor Corticospinal Axon Guidance
Author Information
Author(s): Regina L Faulkner, Lawrence K Low, Xiao-Bo Liu, Jeffrey Coble, Edward G Jones, Hwai-Jong Cheng
Primary Institution: University of California, Davis
Hypothesis
The study investigates the role of plexin signaling in the guidance of motor corticospinal tract axons in vivo.
Conclusion
Plexin-A3, plexin-A4, and Sema6A are required for the proper dorsal turning of motor corticospinal axons at the pyramidal decussation.
Supporting Evidence
- Plexin-A3 and plexin-A4 signaling is required for dorsal turning of CST axons.
- Sema6A is identified as a local cue for motor CST axon turning.
- Mutant mice lacking plexin-A3 and plexin-A4 show guidance defects.
- Proper fasciculation of CST axons is dependent on neuropilin-1.
- Other signaling pathways may compensate for the loss of plexin signaling.
- Defects in CST axon guidance were observed in Sema6A-/- mice.
- PLXA3 and PLXA4 are co-expressed in neuronal tissues.
Takeaway
This study shows that certain proteins help guide nerve fibers in the brain to the right places, which is important for movement.
Methodology
The study used mutant mice to analyze the expression patterns and guidance defects of corticospinal tract axons.
Limitations
The study does not explore all potential signaling pathways involved in CST axon guidance.
Participant Demographics
Mice were used in the study, including various mutant strains.
Statistical Information
P-Value
p<0.01
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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