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Centriole planar polarity assessment in wings. | LitMetric
In vertebrates, planar polarization of ciliary basal bodies has been associated with actin polymerization that occurs downstream of the Frizzled-planar cell polarity (Fz-PCP) pathway. In wing epithelial cells, which do not have cilia, centrioles also polarize in a Fz-PCP-dependent manner, although the relationship with actin polymerization remains unknown. By combining existing and new quantitative methods, we unexpectedly found that known PCP effectors linked to actin polymerization phenotypes affect neither final centriole polarization nor apical centriole distribution. But actin polymerization is required upstream of Fz-PCP to maintain the centrioles in restricted areas in the apical-most planes of those epithelial cells before and after the actin-based hair is formed. Furthermore, in the absence of proper core Fz-PCP signalling, actin polymerization is insufficient to drive this off-centred centriole migration. Altogether, the results reveal that there are at least two pathways controlling centriole positioning in pupal wings - an upstream actin-dependent mechanism involved in centriole distribution that is PCP independent, and an unknown mechanism that links core Fz-PCP and centriole polarization.
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