Probable effector of the planar cell polarity signaling pathway which regulates the septin cytoskeleton in both ciliogenesis and collective cell movements. Together with FUZ and WDPCP proposed to function as core component of the CPLANE (ciliogenesis and planar polarity effectors) complex involved in the recruitment of peripheral IFT-A proteins to basal bodies (By similarity). Interacts with CPLANE1. Interacts with INTU and FUZ; FUZ, INTU and WDPCP probably form the core CPLANE (ciliogenesis and planar polarity effectors) complex. Belongs to the WD repeat fritz family.