Figure 8.

Centriole docking initiated at different stages in cilia deconstruction could account for the variety of intermediates observed. Differences between late-stage cilia/centrosome structures in differentiating cells suggest that instead of a linear deconstruction pathway, variance in the coordination of cilia deconstruction and mother centriole docking could generate multiple routes to mature, unciliated cells with docked mother centrioles. (A) Complete cilia deconstruction results in cytoplasmic centrioles, which then dock at the plasma membrane similar to centriole docking during surface cilia biogenesis and at the immune synapse. (B and C) Cilia deconstruction includes centriole associated membrane intermediates including ciliary vesicles (B) or toroid membranes (C). Centriole docking commences utilizing dynamic tubules to unite the ciliary vesicle with the plasma membrane. (D) Concealed cilia could access the plasma membrane through observed membrane pores. Opening of the pore before the cilium has been deconstructed could result in surface cilia, which subsequently get completely disassembled.

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