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A more recent version of this article appeared on April 1, 2003
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Submitted on September 11, 2002
Revised on November 1, 2002
Accepted on December 4, 2002
1 Pennsylvania State University, Department of Biology, 208 Mueller Laboratory, University Park, PA 16801
* Corresponding author. E-mail address: rjc8{at}psu.edu.
Motor proteins have been implicated in various aspects of mitosis, including spindle assembly and chromosome segregation. Here, we show that acentrosomal Arabidopsis cells that are mutant for the kinesin, ATK1, lack microtubule accumulation at the predicted spindle poles during prophase and have reduced spindle bipolarity during prometaphase. Nonetheless, all abnormalities are rectified by anaphase and chromosome segregation appears normal. We conclude that ATK1 is required for normal microtubule accumulation at the spindle poles during prophase and possibly functions in spindle assembly during prometaphase. Because aberrant spindle morphology in these mutants is resolved by anaphase, we postulate that mitotic plant cells contain an error-correcting mechanism. Moreover, ATK1 function seems to be dosage-dependent, because cells containing one wild-type allele take significantly longer to proceed to anaphase as compared to cells containing two wild-type alleles.
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