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Control of internal and external noise in genetic regulatory networks

机译:控制遗传调控网络中的内部和外部噪声

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Positive and negative feedback loops, for example, where a protein regulates its own transcription, play an important role in many genetic regulatory networks. Such systems will be subject to internal noise, which occurs due to the small number of molecules taking part in some reactions. This paper examines the effect of feedback loops on noise levels. Error growth techniques from nonlinear dynamics are used to estimate the variance of a system around a steady-state attractor. It is shown that variablity due to intrinsic stochasticity is directly linked to the stability of the steady state, and therefore to the system's resistance to external perturbations. The methods are demonstrated for a number of simple systems, including a genetic switch with homo-dimerizing regulatory protein, and an oscillator. (C) 2004 Elsevier Ltd. All rights reserved.
机译:例如,正负反馈环在蛋白质调节其自身转录的过程中,在许多遗传调控网络中起着重要作用。这样的系统将受到内部噪声的影响,这是由于少数分子参与某些反应而产生的。本文研究了反馈环路对噪声水平的影响。非线性动力学的误差增长技术用于估计稳态吸引子周围系统的方差。结果表明,由于固有的随机性,可变性与稳态的稳定性直接相关,并因此与系统对外部干扰的抵抗性直接相关。该方法已针对许多简单系统进行了演示,包括带有均二聚调节蛋白的遗传开关和振荡器。 (C)2004 Elsevier Ltd.保留所有权利。

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