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Wnt signaling establishes anteroposterior neuronal polarity and requires retromer in C. elegans
Abstract
Secreted Wnt proteins influence neural connectivity by regulating axon guidance, dendritic morphogenesis and synapse formation. We report a new role for Wnt and Frizzled proteins in establishing the anteroposterior polarity of the mechanosensory neurons ALM and PLM in C. elegans. Disruption of Wnt signaling leads to a complete inversion of ALM and PLM polarity: the anterior process adopts the length, branching pattern and synaptic properties of the wild-type posterior process, and vice versa. Different but overlapping sets of Wnt proteins regulate neuronal polarity in different body regions. Wnts act directly on PLM via the Frizzled LIN-17. In addition, we show that they are needed for axon branching and anteriorly directed axon growth. We also find that the retromer, a conserved protein complex that mediates transcytosis and endosome-to-Golgi protein trafficking, plays a key role in Wnt signaling. Deletion mutations of retromer subunits cause ALM and PLM polarity, and other Wnt-related defects. We show that retromer protein VPS-35 is required in Wnt-expressing cells and propose that retromer activity is needed to generate a fully active Wnt signal.
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Metadata
- Authors
- Prasad, B. C., & Clark, S. G.
- Venue
- Development
- Publisher
- The Company of Biologists
- Published
- 2006-05-01
- Volume
- 133
- Issue
- 9
- Pages
- 1757-1766
- ISSN
- 0950-1991 (ISSN-L)
- 1477-9129
- OpenAlex
- W2086141702
- Cited by
- 219
- References
- 4
- FWCI
- 8.33
- Type
- journal article
- Language
- en
- Open access
- closed
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