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Published 15 September 2003. doi:10.1083/jcb.200303022
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© The Rockefeller University Press, 0021-9525/2003/9/1003 $5.00
The Journal of Cell Biology, Volume 162, Number 6, 1003-1016


Article

The roles of microtubule-based motor proteins in mitosis

: comprehensive RNAi analysis in the Drosophila S2 cell line



Gohta Goshima and Ronald D. Vale

Howard Hughes Medical Institute and Department of Cellular and Molecular Pharmacology, University of California, San Francisco, San Francisco, CA 94107

Address correspondence to Ronald D. Vale, Dept. of Cellular and Molecular Pharmacology/HHMI, Genentech Hall, Room N312E, University of California, San Francisco, San Francisco, CA 94107. Tel.: (415) 476-6380. Fax: (415) 476-5233. email: vale{at}cmp.ucsf.edu

Kinesins and dyneins play important roles during cell division. Using RNA interference (RNAi) to deplete individual (or combinations of) motors followed by immunofluorescence and time-lapse microscopy, we have examined the mitotic functions of cytoplasmic dynein and all 25 kinesins in Drosophila S2 cells. We show that four kinesins are involved in bipolar spindle assembly, four kinesins are involved in metaphase chromosome alignment, dynein plays a role in the metaphase-to-anaphase transition, and one kinesin is needed for cytokinesis. Functional redundancy and alternative pathways for completing mitosis were observed for many single RNAi knockdowns, and failure to complete mitosis was observed for only three kinesins. As an example, inhibition of two microtubule-depolymerizing kinesins initially produced monopolar spindles with abnormally long microtubules, but cells eventually formed bipolar spindles by an acentrosomal pole-focusing mechanism. From our phenotypic data, we construct a model for the distinct roles of molecular motors during mitosis in a single metazoan cell type.

Key Words: kinesin; spindle; dynein; centrosome; kinetochore


The online version of this article includes supplemental material.

Abbreviations used in this paper: DHC, dynein heavy chain; dsRNA, double-stranded RNA; MTOC, microtubule-organizing center; NEB, nuclear envelope breakdown; Pav, Pavarotti; RNAi, RNA interference.


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