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The Journal of Cell Biology, Vol 134, 455-464, Copyright © 1996 by The Rockefeller University Press


ARTICLES

Anastral meiotic spindle morphogenesis: role of the non-claret disjunctional kinesin-like protein

HJ Matthies, HB McDonald, LS Goldstein and WE Theurkauf
Division of Cellular and Molecular Medicine, University of California at an San Diego 92093-0683, USA.

We have used time-lapse laser scanning confocal microscopy to directly examine microtubule reorganization during meiotic spindle assembly in living Drosophila oocytes. These studies indicate that the bipolarity of the meiosis I spindle is not the result of a duplication and separation of centrosomal microtubule organizing centers (MTOCs). Instead, microtubules first associate with a tight chromatin mass, and then bundle to form a bipolar spindle that lacks asters. Analysis of mutant oocytes indicates that the Non-Claret Disjunctional (NCD) kinesin-like protein is required for normal spindle assembly kinetics and stabilization of the spindle during metaphase arrest. Immunolocalization analyses demonstrate that NCD is associated with spindle microtubules, and that the centrosomal components gamma- tubulin, CP-190, and CP-60 are not concentrated at the meiotic spindle poles. Based on these observations, we propose that microtubule bundling by the NCD kinesin-like protein promotes assembly of a stable bipolar spindle in the absence of typical MTOCs.
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