Dynein Regulator NDEL1 Controls Polarized Cargo Transport at the Axon Initial Segment

M Kuijpers, D van de Willige, A Freal, A Chazeau, MA Franker, J Hofenk, RJC Rodrigues, LC Kapitein, A Akhmanova, Dick Jaarsma, CC Hoogenraad

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The development and homeostasis of neurons relies heavily on the selective targeting of vesicles into axon and dendrites. Microtubule-based motor proteins play an important role in polarized transport; however, the sorting mechanism to exclude dendritic cargo from the axon is unclear. We show that the dynein regulator NDEL1 controls somato-dendritic cargo transport at the axon initial segment (AIS). NDEL1 localizes to the AIS via an interaction with the scaffold protein Ankyrin-G. Depletion of NDEL1 or its binding partner LIS1 results in both cell-wide and local defects, including the non-polarized trafficking of dendritic cargo through the AIS. We propose a model in which LIS1 is a critical mediator of local NDEL1-based dynein activation at the AIS. By localizing to the AIS, NDEL1 facilitates the reversal of somatodendritic cargos in the proximal axon.
Original languageUndefined/Unknown
Pages (from-to)461-471
Number of pages11
Issue number3
Publication statusPublished - 2016

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