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Updated: Jul 20, 2026
07:07
Evaluation of Planar-Cell-Polarity Phenotypes in Ciliopathy Mouse Mutant Cochlea
Published on: February 21, 2016
General and cell-type specific mechanisms target TRPP2/PKD-2 to cilia
Young-Kyung Bae1, Hongmin Qin, Karla M Knobel
1Laboratory of Genetics, Division of Pharmaceutical Sciences, University of Wisconsin-Madison, Madison, WI 53705-2222, USA.
Development (Cambridge, England)
|September 1, 2006
Summary
The transient receptor potential polycystin 2 channel (TRPP2/PKD-2) requires specific cellular machinery for ciliary localization. This study reveals distinct molecular steps for directing TRPP2/PKD-2 to cilia in neurons.
Area of Science:
- Neuroscience
- Cell Biology
- Molecular Biology
Background:
- Ciliary localization of the transient receptor potential polycystin 2 channel (TRPP2/PKD-2) is crucial and evolutionarily conserved.
- The precise mechanisms governing TRPP2/PKD-2 targeting to cilia remain largely unknown.
Purpose of the Study:
- To investigate the motility and localization of the TRPP2 homolog, PKD-2, in C. elegans sensory neurons.
- To identify molecular factors regulating PKD-2's journey to the cilium.
Main Methods:
- Utilized GFP-tagged PKD-2 in C. elegans sensory neurons.
- Investigated the role of UNC-101/adaptor protein 1 (AP-1) complex and LOV-1.
- Assessed the impact of expressing PKD-2 in non-native neurons.
- Examined the necessity of intraflagellar transport (IFT).
Main Results:
- GFP-tagged PKD-2 exhibits bidirectional movement within the dendritic compartment.
- The UNC-101/AP-1 complex directs PKD-2 to motile dendritic particles.
- Cell-type specific factors are essential for dendritic and ciliary targeting.
- LOV-1 is required for PKD-2 stabilization in cilia and cell bodies; its absence leads to reduced ciliary PKD-2 and aggregation.
- IFT is not essential for dendritic motility or ciliary entry but may influence ciliary abundance.
Conclusions:
- TRPP2/PKD-2 subcellular distribution is governed by both general and cell-type-specific factors.
- At least two distinct sorting steps, somatodendritic and ciliary, are involved in regulating PKD-2 localization.
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