Journal
DEVELOPMENTAL BIOLOGY
Volume 325, Issue 2, Pages 386-399Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ydbio.2008.10.042
Keywords
Prickle isoforms; Planar cell polarity; PET domain; LIM domain; CAAX motif; Drosophila
Categories
Funding
- MRC Programme
- Universities UK
- Cambridge Overseas Trust
- C.T. Taylor Studentship
- Basic and Applied Research Project of the Basque Government [P12004-19]
- MRC [G8225539] Funding Source: UKRI
- Medical Research Council [G8225539] Funding Source: researchfish
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Prickle-Spiny-Legs (Pk) is an essential component of the planar cell polarity (PCP) pathway, together with Frizzled (Fz) and Dishevelled (Dsh). A role for Pk was Proposed to mediate feedback amplification of asymmetric Fz/Dsh activity across cell boundaries, ensuring a single prehair initiates at each distal vertex. Here we show that apical localisation of Pk(Pk) and Pk(Sple) isoforms are mutually independent and regulated by the C-terminal domain. The N-terminus of Pk(Pk) is dispensable for PCP, whereas the unique N-terminal domain of Pk(Sple) contains an additional localisation function, which confers a qualitatively different activity. Our results suggest that endogenous Pk(Pk) and Pk(Sple) can affect each other's function via the C-terminal domain, yet may not form heteromeric complexes. Overexpressing PET domain-deleted Pk variants interferes with a branch of Fz/Dsh signalling that regulates the number of wing hairs, and blocks non-cell-autonomous repolarisation. We infer that Pk(Pk) is sufficient to mediate the intercellular feedback signalling. Significantly, Pk(Pk) but not Pk(Sple) is required for hexagonal cell packing in the pupal wing. We propose that Fz-dependent PCP readout reflects short-range, cell-contact based, interactions between hexagonal cells, rather than a direct response to an as yet unidentified diffusible ligand. (C) 2008 Elsevier Inc. All rights reserved.
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