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. The disease is caused by variants affecting the gene represented in this entry. The disease is caused by variants affecting the gene represented in this entry. Mutations in WDPCP may act as modifiers of the phenotypic expression of Bardet-Biedl syndrome and Meckel syndrome by interacting in trans with primary BBS and MKS loci. Belongs to the WD repeat fritz family. It is uncertain whether Met-1 or Met-34 is the initiator.