Summary
For the budding yeast Saccharomyces cerevisiae the mitotic cell cycle is coordinated with cell mass at the regulatory step “start”. The threshold amount of cell mass (reflected as a “critical size”) necessary for “start” is proportional to nutrient quality. This relationship leads to a transient accumulation of cells at “start”, termed nutrient modulation, upon enrichment of nutrient conditions. Nutrient enrichment abruptly increases the critical size needed for “start”, causing the smaller cells, produced in the previous cell cycle, to be delayed at “start” while growing larger. Here we show that, in S. cerevisiae, a second cell-cycle step, at mitosis, also exhibits nutrient modulation, and is, therefore, another point of cell-cycle regulation. At both mitosis and “start”, nutrient modulation was found through mutation to be regulated by the activity of the cyclin-related WHI1 (CLN3) gene product.
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Veinot-Drebot, L.M., Johnston, G.C. & Singer, R.A. A cyclin protein modulates mitosis in the budding yeast Saccharomyces cerevisiae . Curr Genet 19, 15–19 (1991). https://doi.org/10.1007/BF00362082
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DOI: https://doi.org/10.1007/BF00362082