Forms part of a complex involved in intraflagellar transport (IFT), the bi-directional movement of particles required for the assembly, maintenance and functioning of primary cilia. Plays a role in maintaining IFT complex B stability. Component of the IFT complex B, the core composed of IFT25, IFT27, IFT46, IFT52, IFT74, IFT81 and IFT88 as well as associated subunits IFT20, IFT57, IFT80 and IFT172. Interacts with IFT25, IFT52, IFT70, IFT88 AND DAW1. Expression is concentrated at the cilium basal body but is also detected along the length of the cilium. Individuals have short, non-motile flagellae. Belongs to the IFT46 family.