Graded and binary responses in stochastic gene expression

Karmakar, Rajesh ; Bose, Indrani (2004) Graded and binary responses in stochastic gene expression Physical Biology, 1 (4). pp. 197-214. ISSN 1478-3967

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Recently, several theoretical and experimental studies have been undertaken to probe the effect of stochasticity on gene expression (GE). In experiments, the GE response to an inducing signal in a cell, measured by the amount of mRNAs/proteins synthesized, is found to be either graded or binary. The latter type of response gives rise to a bimodal distribution in protein levels in an ensemble of cells. One possible origin of binary response is cellular bistability achieved through positive feedback or autoregulation. In this paper, we study a simple, stochastic model of GE and show that the origin of binary response lies exclusively in stochasticity. The transitions between the active and inactive states of the gene are random in nature. Graded and binary responses occur in the model depending on the relative stability of the activated and deactivated gene states with respect to that of mRNAs/proteins. The theoretical results on binary response provide a good description of the 'all-or-none' phenomenon observed in an eukaryotic system.

Item Type:Article
Source:Copyright of this article belongs to Institute of Physics Publishing.
ID Code:5929
Deposited On:19 Oct 2010 10:10
Last Modified:16 May 2016 16:21

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