Frizzled-dependent planar cell polarity without secreted Wnt ligands
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Joyce Yu Aude Maugarny-Calès Stéphane Pelletier Cyrille Alexandre Yohanns Bellaiche Jean-Paul Vincent Ian McgoughAbstract
Planar cell polarity (PCP) organizes the orientation of cellular protrusions and migratory activity within the tissue plane. PCP establishment involves the subcellular polarization of core PCP components. It has been suggested that Wnt gradients could provide a global cue that coordinates local PCP with tissue axes. Here, we dissect the role of Wnt ligands in the orientation of hairs of Drosophila wings, an established system for the study of PCP. We found that PCP was normal in quintuple mutant wings that rely solely on the membrane-tethered Wingless for Wnt signaling, suggesting that a Wnt gradient is not required. We then used a nanobody-based approach to trap Wntless in the endoplasmic reticulum, and hence prevent all Wnt secretion, specifically during the period of PCP establishment. PCP was still established. We conclude that, even though Wnt ligands could contribute to PCP, they are not essential, and another global cue must exist for tissue-wide polarization.
Journal details
Journal Developmental Cell
Volume 54
Issue number 5
Pages 583-592.e5
Available online
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Publisher website (DOI) 10.1016/j.devcel.2020.08.004
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Europe PubMed Central 32888416
Pubmed 32888416
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