Bistable responses in bacterial genetic networks: designs and dynamical consequences.

Bistable responses in bacterial genetic networks: designs and dynamical consequences.
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DOI:
10.1016/j.mbs.2011.03.004
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发表时间:
2011-05
影响因子:
4.3
通讯作者:
Igoshin OA
Igoshin OA
中科院分区:
生物学4区
文献类型:
--
作者:
Tiwari A;Ray JC;Narula J;Igoshin OA

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活细胞的一个关键特性是它们对刺激做出特定生化反应的能力。这些反应可以通过潜在的生物化学和遗传网络的动态来理解。进化设计原理已经在显示分级响应的网络中得到了很好的研究,输入信号和系统输出之间具有连续的关系。或者,生物化学网络可以表现出双稳态响应,使得在一定范围的信号下,网络具有两个稳定的稳态。在这篇综述中,我们讨论了几个概念性的例子,说明网络设计,可以导致一个生物化学网络的响应。接下来,我们将研究这些设计在细菌主调控基因回路中的表现。特别是,我们讨论了机制和动态后果的双稳态三个电路:两个组件的系统,西格玛因子网络,和一个多步的phosphorelay。分析这些例子,使我们能够扩大我们的知识进化设计原则的网络与非线性响应。
A key property of living cells is their ability to react to stimuli with specific biochemical responses. These responses can be understood through the dynamics of underlying biochemical and genetic networks. Evolutionary design principles have been well studied in networks that display graded responses, with a continuous relationship between input signal and system output. Alternatively, biochemical networks can exhibit bistable responses so that over a range of signals the network possesses two stable steady states. In this review, we discuss several conceptual examples illustrating network designs that can result in a bistable response of the biochemical network. Next, we examine manifestations of these designs in bacterial master-regulatory genetic circuits. In particular, we discuss mechanisms and dynamic consequences of bistability in three circuits: two-component systems, sigma-factor networks, and a multistep phosphorelay. Analyzing these examples allows us to expand our knowledge of evolutionary design principles for networks with bistable responses.
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