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Bistability, Probability Transition Rate and First-Passage Time in an Autoactivating Positive-Feedback Loop

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  • Xiu-Deng Zheng
  • Xiao-Qian Yang
  • Yi Tao

Abstract

A hallmark of positive-feedback regulation is bistability, which gives rise to distinct cellular states with high and low expression levels, and that stochasticity in gene expression can cause random transitions between two states, yielding bimodal population distribution (Kaern et al., 2005, Nat Rev Genet 6: 451-464). In this paper, the probability transition rate and first-passage time in an autoactivating positive-feedback loop with bistability are investigated, where the gene expression is assumed to be disturbed by both additive and multiplicative external noises, the bimodality in the stochastic gene expression is due to the bistability, and the bistability determines that the potential of the Fokker-Planck equation has two potential wells. Our main goal is to illustrate how the probability transition rate and first-passage time are affected by the maximum transcriptional rate, the intensities of additive and multiplicative noises, and the correlation of additive and multiplicative noises. Our main results show that (i) the increase of the maximum transcription rate will be useful for maintaining a high gene expression level; (ii) the probability transition rate from one potential well to the other one will increase with the increase of the intensity of additive noise; (iii) the increase of multiplicative noise strength will increase the amount of probability in the left potential well; and (iv) positive (or negative) cross-correlation between additive and multiplicative noises will increase the amount of probability in the left (or right) potential well.

Suggested Citation

  • Xiu-Deng Zheng & Xiao-Qian Yang & Yi Tao, 2011. "Bistability, Probability Transition Rate and First-Passage Time in an Autoactivating Positive-Feedback Loop," PLOS ONE, Public Library of Science, vol. 6(3), pages 1-10, March.
    • Handle: RePEc:plo:pone00:0017104
    DOI: 10.1371/journal.pone.0017104
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    References listed on IDEAS

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    1. Ertugrul M. Ozbudak & Mukund Thattai & Han N. Lim & Boris I. Shraiman & Alexander van Oudenaarden, 2004. "Multistability in the lactose utilization network of Escherichia coli," Nature, Nature, vol. 427(6976), pages 737-740, February.
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