Abstract
Some of the events of the cell cycle appear to be triggered by a bistable mechanism. A bistable biochemical system can respond to a small, slow signal and is carried by positive feedback from one stable steady state directly to another, in an all-or-none manner. Slow or subthreshold stimuli do not cause accommodation or loss of excitability. Switching is not readily reversible by removing the stimulus, i.e. there is hysteresis: reversal generally requires a stronger, opposite stimulus. Biochemically, bistable biochemical switching requires positive feedback, and mechanisms for stabilizing the system against premature activation and for destabilization in response to a biological signal. Three bistable bio-chemical models, all suggested by reported experimental observations, are described and analysed. These models suggest that a titratable inhibitor may play an important part in bistable switching, because the end-point of titration can form a natural threshold for enhancement of positive feedback.
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Most of this work was done while the author was in the department of Pharmacology and Toxicology, Dartmouth Medical School, Hanover, NH 03755, USA
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Thron, C. Bistable biochemical switching and the control of the events of the cell cycle*. Oncogene 15, 317–325 (1997). https://doi.org/10.1038/sj.onc.1201190
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DOI: https://doi.org/10.1038/sj.onc.1201190
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