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Permanent link (DOI): https://doi.org/10.7939/R3F47GX0T

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Visualization of dynein-dependent microtubule gliding at the cell cortex: implications for spindle positioning Open Access

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Author or creator
Gusnowski, E.M.
Srayko, M.
Additional contributors
Subject/Keyword
Caenorhabditis-elegans embryos
polarity
C-elegans
localization
G-alpha
force
cytoplasmic dynein
proteins
division
mitotic spindle
Type of item
Journal Article (Published)
Language
English
Place
Time
Description
Dynein motors move along the microtubule (MT) lattice in a processive “walking” manner. In the one-cell Caenorhabditis elegans embryo, dynein is required for spindle-pulling forces during mitosis. Posteriorly directed spindle-pulling forces are higher than anteriorly directed forces, and this imbalance results in posterior spindle displacement during anaphase and an asymmetric division. To address how dynein could be asymmetrically activated to achieve posterior spindle displacement, we developed an assay to measure dynein’s activity on individual MTs at the embryo cortex. Our study reveals that cortical dynein motors maintain a basal level of activity that propels MTs along the cortex, even under experimental conditions that drastically reduce anaphase spindle forces. This suggests that dynein-based MT gliding is not sufficient for anaphase spindle-pulling force. Instead, we find that this form of dynein activity is most prominent during spindle centering in early prophase. We propose a model whereby different dynein–MT interactions are used for specific spindle-positioning tasks in the one-cell embryo.
Date created
2011
DOI
doi:10.7939/R3F47GX0T
License information
Rights
© 2011 Gusnowski and Srayko This article is distributed under the terms of a Creative Commons License (Attribution–Noncommercial–Share Alike 3.0 Unported license, as described at http://creativecommons.org/licenses/by-nc-sa/3.0/).
Citation for previous publication
Gusnowski, E. M., & Srayko, M. (2011). Visualization of dynein-dependent microtubule gliding at the cell cortex: implications for spindle positioning. The Journal of Cell Biology, 194(3), 377-386.
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