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Deprecated: Implicit conversion from float 233.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Nat+Cell+Biol 2015 ; 17 (3): 228-40 Nephropedia Template TP
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Early steps in primary cilium assembly require EHD1- and EHD3-dependent ciliary vesicle formation #MMPMID25686250
Lu Q; Insinna C; Ott C; Stauffer J; Pintado PA; Rahajeng J; Baxa U; Walia V; Cuenca A; Hwang YS; Daar IO; Lopes S; Lippincott-Schwartz J; Jackson PK; Caplan S; Westlake CJ
Nat Cell Biol 2015[Mar]; 17 (3): 228-40 PMID25686250show ga
Membrane association with mother centriole (M-centriole) distal appendages is critical for ciliogenesis initiation. How the Rab GTPase Rab11-Rab8 cascade functions in early ciliary membrane assembly is unknown. Here, we show that the membrane shaping proteins EHD1 and EHD3, in association with the Rab11-Rab8 cascade, function in early ciliogenesis. EHD1 and EHD3 localize to pre-ciliary membranes and the ciliary pocket. EHD-dependent membrane tubulation is essential for ciliary vesicle (CV) formation from smaller distal appendage vesicles (DAV). Importantly, this step functions in M-centriole to basal body transformation and recruitment of transition zone proteins and IFT20. SNAP29, a SNARE membrane fusion regulator and EHD1-binding protein, is also required for DAV-mediated CV assembly. Interestingly, only after CV assembly is Rab8 activated for ciliary growth. Our studies uncover molecular mechanisms informing a previously uncharacterized ciliogenesis step whereby EHD1 and EHD3 reorganize the M-centriole and associated DAV prior to coordinated ciliary membrane and axoneme growth.