Roles for CEP170 in cilia function and dynein-2 assembly.

Primary cilia are essential eukaryotic organelles required for signalling and secretion. Dynein-2 is a microtubule-motor protein complex and is required for ciliogenesis via its role in facilitating retrograde intraflagellar transport from the cilia tip to the cell body. Dynein-2 must be assembled and loaded onto IFT-trains for entry into cilia for this process to occur but how dynein-2 is assembled and how it is recycled back into a cilium remain poorly understood. Here, we identify Centrosomal Protein of 170 kDa (CEP170) as a dynein-2 interacting protein. We show that loss of CEP170 perturbs intraflagellar transport, Hedgehog signalling, and alters the stability of dynein-2 holoenzyme complex. Together, our data indicate a role for CEP170 in supporting cilia function and dynein-2 assembly.