Plays a role in motile cilium function, possibly by acting on outer dynein arm assembly (PubMed:26904945). Seems to be important for initiation rather than maintenance of cilium motility (By similarity). Required for correct positioning of the cilium at the apical cell surface, suggesting an additional role in the planar cell polarity (PCP) pathway (PubMed:26904945). May suppress canonical Wnt signaling activity (PubMed:26904945). Appears in cytoplasmic puncta, compatible with a centrosomal localization (By similarity). Morpholino knockdown of the protein results in loss of cilia-driven fluid flow along the anterior-posterior axis. Multiciliated cells show loss of coordinated cilium polarity with many cilia pointing towards the anterior instead of the posterior. The planar cell polarity (PCP) component prickle2 is uniformly distributed around the cell margin, instead of being asymmetrically localized to the posterior of the cell. Belongs to the CFAP298 family.