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Manipulation and Analysis of Cell Cycle-Dependent Processes in Budding Yeast
Published on: September 26, 2025
Stage-dependent density effect in the cell cycle of budding yeast
Kei-Ichi Tainaka1, Jin Yoshimura, Takashi Ushimaru
1Department of Systems Engineering, Shizuoka University, Hamamatsu 432-8561, Japan. tainaka@sys.eng.shizuoka.ac.jp
Journal of Theoretical Biology
|June 13, 2006
Summary
Yeast population growth stops due to a density effect. In crowded conditions, large daughter yeast cells halt reproduction, suggesting an inhibitor specific to matured cells.
Area of Science:
- Microbiology
- Cell Biology
- Mathematical Biology
Background:
- Yeast populations exhibit exponential growth followed by saturation due to density-dependent effects.
- Budding yeast, Saccharomyces cerevisiae, shows stage-dependent cell division with longer generation times for daughter cells requiring maturation.
- Previous studies on density effects were limited to non-crowding or exponential growth phases.
Purpose of the Study:
- To investigate the stage-dependent nature of the density effect in yeast populations during crowding.
- To explore the population dynamics of Saccharomyces cerevisiae under crowded conditions using a theoretical model.
Main Methods:
- Development of a lattice gas model to simulate yeast population dynamics.
- Comparison of theoretical model predictions with experimental data.
- Analysis of cell division and reproduction in relation to cell density and stage.
Main Results:
- A stage-dependent density effect was observed in yeast populations.
- Small daughter cells can mature to a critical size.
- Reproduction of large daughter cells is abruptly inhibited above a critical population density.
Conclusions:
- The findings suggest an inhibitor specifically targets and halts the reproduction of mature daughter yeast cells in dense cultures.
- This inhibitor plays a crucial role in regulating yeast population dynamics under crowding stress.
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