Publications
bioRxivJun 2025 DOI:
10.1101/2025.06.27.661943

Spectraplakin cooperates with noncentrosomal microtubule regulators to orient dendritic microtubules in Drosophila

Davies, Matthew; Sanal, Neeraja; Wolterhoff, Neele; Gigengack, Ulrike; Shen, Y.; Hahn, Ines; Rumpf, Sebastian
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Abstract
The differential microtubule organization in axons and dendrites underlies neurite-specific transport and morphogenetic processes like developmental neurite pruning, but how it arises is incompletely understood. While axonal plus end-out microtubules just grow from the soma, the origin of the dendritic plus end-in microtubules is more difficult to explain. A transient microtubule organizing center (MTOC) was recently detected at dendrite tips in C. elegans, but the players and generalizability are unclear. In a survey for factors involved in dendrite pruning of Drosophila sensory neurons, we found the spectraplakin Short stop (Shot), an actin-microtubule crosslinker known to bundle axonal microtubules. In dendrites, however, Shot is required for proper plus end-in microtubule organization. During early dendrite development, Shot localizes to dendrite tips in an actin-dependent manner, providing a potential mechanism for dendrite tip recognition. Our data show that Shot cooperates with a functional MTOC containing the small GTPase Rab11. Localized MTOC activity may commonly underlie dendritic microtubule organization.
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