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Juhl, Alice Dupont; Anvarian, Zeinab; Kuhns, Stefanie; Berges, Julia; Andersen, Jens S; Wüstner, Daniel; Pedersen, Lotte B
Journal of cell science, 2023-Mar-01, 2023-03-01, 20230301, Letnik: 136, Številka: 5Journal Article
Primary cilia are microtubule-based sensory organelles whose assembly and function rely on the conserved bidirectional intraflagellar transport (IFT) system, which is powered by anterograde kinesin-2 and retrograde cytoplasmic dynein-2 motors. Nematodes additionally employ a cell-type-specific kinesin-3 motor, KLP-6, which moves within cilia independently of IFT and regulates ciliary content and function. Here, we provide evidence that a KLP-6 homolog, KIF13B, undergoes bursts of bidirectional movement within primary cilia of cultured immortalized human retinal pigment epithelial (hTERT-RPE1) cells. Anterograde and retrograde intraciliary velocities of KIF13B were similar to those of IFT (as assayed using IFT172-eGFP), but intraciliary movement of KIF13B required its own motor domain and appeared to be cell-type specific. Our work provides the first demonstration of motor-driven, intraciliary movement by a vertebrate kinesin other than kinesin-2 motors.
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