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Research Article
The Drosophila phosphatidylinositol transfer protein encoded by vibrator is essential to maintain cleavage-furrow ingression in cytokinesis
Melanie K. Gatt, David M. Glover
Journal of Cell Science 2006 119: 2225-2235; doi: 10.1242/jcs.02933
Melanie K. Gatt
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David M. Glover
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Summary

Cytokinesis requires the coordination of cytoskeletal and plasma membrane dynamics. A role for phosphatidylinositol lipids has been proposed for the successful completion of cytokinesis but this is still poorly characterised. Here, we show mutants of the gene vibrator, previously found to encode the Drosophila phosphatidylinositol transfer protein, produce multinucleate cells indicative of cytokinesis failure in male meiosis. Examination of fixed preparations of mutant spermatocytes showed contractile rings of anillin and actin that were of normal appearance at early stages but were larger and less well organised at later stages of cytokinesis than in wild-type cells. Time-lapse imaging revealed sequential defects in cytokinesis of vibrator spermatocytes. In cells that fail cytokinesis, central spindle formation occurred correctly, but furrow ingression was delayed and the central spindle did not become compressed to the extent seen in wild-type cells. Cells then stalled at this point before the apparent connection between the constricted cytoskeleton and the plasma membrane was lost; the furrow then underwent elastic regression. We discuss these defects in relation to multiple functions of phosphoinositol lipids in regulating actin dynamics and membrane synthesis.

  • Drosophila
  • Cytokinesis
  • PITP
  • Spermatogenesis
  • Vibrator
  • Accepted February 13, 2006.
  • © The Company of Biologists Limited 2006
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Research Article
The Drosophila phosphatidylinositol transfer protein encoded by vibrator is essential to maintain cleavage-furrow ingression in cytokinesis
Melanie K. Gatt, David M. Glover
Journal of Cell Science 2006 119: 2225-2235; doi: 10.1242/jcs.02933
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Research Article
The Drosophila phosphatidylinositol transfer protein encoded by vibrator is essential to maintain cleavage-furrow ingression in cytokinesis
Melanie K. Gatt, David M. Glover
Journal of Cell Science 2006 119: 2225-2235; doi: 10.1242/jcs.02933

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