Involved in the localization of proteins to the cilium and cilium assembly. Indirectly regulates the signaling functions of the cilium, being required for normal SHH/smoothened signaling and proper development. Interacts with TBC1D32; may play a role in cilium assembly. Strong expression in the early embryonic stages 8 dpc, 9 dpc and 10 dpc in the neuroepithelium and by the maxillary arches. Belongs to the FAM149 family. Extended N-terminus.