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Journal of Cell Science, Vol 113, Issue 7 1223-1230, Copyright © 2000 by Company of Biologists
JOURNAL ARTICLES |
J Liu, H Wang and MK Balasubramanian
Cell Division Laboratory, Institute of Molecular Agrobiology, The National University of Singapore, Singapore 117604, Republic of Singapore.
Cell division in Schizosaccharomyces pombe is achieved through the use of a medially positioned actomyosin ring. A division septum is formed centripetally, concomitant with actomyosin ring constriction. Genetic screens have identified mutations in a number of genes that affect actomyosin ring or septum assembly. These cytokinesis-defective mutants, however, undergo multiple S and M phases and die as elongated cells with multiple nuclei. Recently, we have shown that a mutant allele of the S. pombe drc1(+)/cps1(+) gene, which encodes a 1,3-(beta)-glucan synthase subunit, is defective in cytokinesis but displays a novel phenotype. drc1-191/cps1-191 cells are capable of assembling actomyosin rings and completing mitosis, but are incapable of assembling the division septum, causing them to arrest as binucleate cells with a stable actomyosin ring. Each nucleus in arrested cps1-191 cells is able to undergo S phase but these G(2) nuclei are significantly delayed for entry into the M phase. In this study we have investigated the mechanism that causes cps1-191 to block with two G(2) nuclei. We show that the inability of cps1-191 mutants to proceed through multiple mitotic cycles is not related to a defect in cell growth. Rather, the failure to complete some aspect of cytokinesis may prevent the G(2)/M transition of the two interphase-G(2) nuclei. The G(2)/M transition defect of cps1-191 mutants is suppressed by a mutation in the wee1 gene and also by the dominant cdc2 allele cdc2-1w, but not the cdc2-3w allele. Transient depolymerization of all F-actin structures also allowed a significant proportion of the cps1-191 cells to undergo a second round of mitosis. We conclude that an F-actin and Wee1p dependent checkpoint blocks G(2)/M transition until previous cytokinesis is completed.
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