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© The Rockefeller University Press, 0021-9525/1998//659 $5.00
The Journal of Cell Biology, Volume 143, Number 3, , 1998 659-671


Regular Articles

Drosophila Polo Kinase Is Required for Cytokinesis



Mar Carmena*, Maria Giovanna Riparbelli{ddagger}, Gianluca Minestrini*, Álvaro M. Tavares*, Richard Adams*, Giuliano Callaini{ddagger}, and David M. Glover*

* CRC Cell Cycle Group, Cancer Research Campaign Laboratories, Department of Anatomy and Physiology, Medical Sciences Institute, University of Dundee, Dundee DD1 4HN, Scotland; and {ddagger} Dipartimento di Biologia Evolutiva, Università di Siena, Via Mattioli 4, 53100 Siena, Italy

A number of lines of evidence point to a predominance of cytokinesis defects in spermatogenesis in hypomorphic alleles of the Drosophila polo gene. In the pre-meiotic mitoses, cytokinesis defects result in cysts of primary spermatocytes with reduced numbers of cells that can contain multiple centrosomes. These are connected by a correspondingly reduced number of ring canals, structures formed by the stabilization of the cleavage furrow. The earliest defects during the meiotic divisions are a failure to form the correct mid-zone and mid-body structures at telophase. This is accompanied by a failure to correctly localize the Pavarotti kinesin- like protein that functions in cytokinesis, and of the septin Peanut and of actin to be incorporated into a contractile ring. In spite of these defects, cyclin B is degraded and the cells exit M phase. The resulting spermatids are frequently binuclear or tetranuclear, in which case they develop either two or four axonemes, respectively. A significant proportion of spermatids in which cytokinesis has failed may also show the segregation defects previously ascribed to polo1 mutants. We discuss these findings in respect to conserved functions for the Polo-like kinases in regulating progression through M phase, including the earliest events of cytokinesis.

Key Words: Drosophila • Polo • cytokinesis • spermatogenesis • meiosis



Abbreviations used in this paper: APC, anaphase-promoting complex; PLK, Polo-like kinase.

Our work was supported by grants from the Cancer Research Campaign, BBSRC, and the European Union.

R. Adams's present address is Institute of Cellular and Molecular Biology, King's Buildings, University of Edinburgh, Mayfield Road, Edinburgh, Scotland.

Address all correspondence to D.M. Glover, CRC Cell Cycle Group, Cancer Research Campaign Laboratories, Department of Anatomy and Physiology, Medical Sciences Institute, University of Dundee, Dundee DD1 4HN, Scotland. Tel.: (44) 1382-344793. Fax: (44) 1382-344213. E-mail: d.m.glover{at}dundee.ac.uk



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