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Cytoskeleton
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Cytoskeleton
Article . 2016 . Peer-reviewed
License: Wiley Online Library User Agreement
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Cytoskeleton
Article . 2016
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Kinesin‐2 and Apc function at dendrite branch points to resolve microtubule collisions

Authors: Alexis T, Weiner; Michael C, Lanz; Daniel J, Goetschius; William O, Hancock; Melissa M, Rolls;

Kinesin‐2 and Apc function at dendrite branch points to resolve microtubule collisions

Abstract

In Drosophila neurons, kinesin‐2, EB1 and Apc are required to maintain minus‐end‐out dendrite microtubule polarity, and we previously proposed they steer microtubules at branch points. Motor‐mediated steering of microtubule plus ends could be accomplished in two ways: 1) by linking a growing microtubule tip to the side of an adjacent microtubule as it navigates the branch point (bundling), or 2) by directing a growing microtubule after a collision with a stable microtubule (collision resolution). Using live imaging to distinguish between these two mechanisms, we found that reduction of kinesin‐2 did not alter the number of microtubules that grew along the edge of the branch points where stable microtubules are found. However, reduction of kinesin‐2 or Apc did affect the number of microtubules that slowed down or depolymerized as they encountered the side of the branch opposite to the entry point. These results are consistent with kinesin‐2 functioning with Apc to resolve collisions. However, they do not pinpoint stable microtubules as the collision partner as stable microtubules are typically very close to the membrane. To determine whether growing microtubules were steered along stable ones after a collision, we analyzed the behavior of growing microtubules at dendrite crossroads where stable microtubules run through the middle of the branch point. In control neurons, microtubules turned in the middle of the crossroads. However, when kinesin‐2 was reduced some microtubules grew straight through the branch point and failed to turn. We propose that kinesin‐2 functions to steer growing microtubules along stable ones following collisions. © 2016 Wiley Periodicals, Inc.

Related Organizations
Keywords

Neurons, Cytoskeletal Proteins, Animals, Cell Polarity, Drosophila Proteins, Fluorescent Antibody Technique, Kinesins, Drosophila, Dendrites, Microtubules

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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
22
Top 10%
Average
Top 10%
bronze