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Updated: May 15, 2025
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Evaluation of Planar-Cell-Polarity Phenotypes in Ciliopathy Mouse Mutant Cochlea
Published on: February 21, 2016
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Rac1 and Nectin3 are essential for planar cell polarity-directed axon guidance in the peripheral auditory system
Shaylyn Clancy1, Nicholas Xie1, Tess Eluvathingal Muttikkal1
1Department of Cell Biology, University of Virginia Health System, Charlottesville, VA 22903, USA.
Development (Cambridge, England)
|April 10, 2025
Summary
Planar cell polarity signaling guides spiral ganglion neuron (SGN) axon turning in the cochlea. This study identifies Nectin3 and Rac1 as key regulators of this process in mouse cochlear supporting cells.
Area of Science:
- Neuroscience
- Developmental Biology
- Cell Biology
Background:
- Spiral ganglion neurons (SGNs) transmit auditory information from the cochlea.
- Type II SGNs (SGNIIs) innervate outer hair cells, requiring precise axon guidance.
- Planar cell polarity (PCP) pathway is known to guide SGNII peripheral afferent turning non-autonomously.
Purpose of the Study:
- To elucidate the underlying molecular mechanisms of PCP-directed SGNII peripheral afferent turning.
- To identify specific molecules regulated by PCP signaling in cochlear supporting cells that influence SGNII axon guidance.
Main Methods:
- Investigated the role of Rac1 and Nectin3 in mouse cochlear supporting cells (SCs).
- Analyzed SGNII peripheral afferent turning defects in Vangl2 mutants lacking Rac1 or Nectin3.
- Examined the localization of PCP proteins (Vangl2, Dvl3) and Rac1/Nectin3 at SC-SC junctions.
Main Results:
- PCP signaling regulates the junctional localization of Rac1 and Nectin3 in cochlear supporting cells.
- Loss of Rac1 or Nectin3 partially replicated SGNII peripheral afferent turning defects observed in Vangl2 mutants.
- Rac1 non-autonomously regulates Vangl2 and Dvl3 localization at SC-SC junctions.
- Nectin3 appears to function in cell adhesion to control SGNII afferent turning.
Conclusions:
- Nectin3 and Rac1 are identified as crucial regulators of PCP-directed SGNII axon guidance in the cochlea.
- Rac1 influences PCP protein localization, while Nectin3 contributes via cell adhesion.
- These findings provide novel insights into the molecular mechanisms of auditory neuron development and guidance.
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