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Genetics, Vol 138, 47-60, Copyright © 1994
INVESTIGATIONS |
SPO13 Negatively Regulates the Progression of Mitotic and Meiotic Nuclear Division in Saccharomyces cerevisiae
R. M. McCarroll and R. E. Esposito
Departments of Radiation and Cellular Oncology, University of Chicago, Chicago, Illinois 60637
The meiosis-specific yeast gene SPO13 has been previously shown to be required to obtain two successive divisions in meiosis. We report here that vegetative expression of this gene causes a CDC28-dependent cell-cycle arrest at mitosis. Overexpression of SPO13 during meiosis causes a transient block to completion of the meiosis I division and suppresses the inability of cdc28(ts) strains to execute meiosis II. The spo13 defect can be partially suppressed by conditions that slow progression of the first meiotic division. Based on the results presented below, we propose that SPO13 acts as a meiotic timing function by transiently blocking progression through the meiosis I division, thereby allowing (1) coordination of the first division with assembly of the reductional segregation apparatus, and (2) subsequent entry into a second round of segregation to separate replicated sister chromatids without an intervening S-phase.
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