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首页> 美国卫生研究院文献>Frontiers in Plant Science >Stochastic models of cellular circadian rhythms in plants help to understand the impact of noise on robustness and clock structure
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Stochastic models of cellular circadian rhythms in plants help to understand the impact of noise on robustness and clock structure

机译：植物细胞昼夜节律的随机模型有助于了解噪声对鲁棒性和时钟结构的影响

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摘要

Rhythmic behavior is essential for plants; for example, daily (circadian) rhythms control photosynthesis and seasonal rhythms regulate their life cycle. The core of the circadian clock is a genetic network that coordinates the expression of specific clock genes in a circadian rhythm reflecting the 24-h dayight cycle. Circadian clocks exhibit stochastic noise due to the low copy numbers of clock genes and the consequent cell-to-cell variation: this intrinsic noise plays a major role in circadian clocks by inducing more robust oscillatory behavior. Another source of noise is the environment, which causes variation in temperature and light intensity: this extrinsic noise is part of the requirement for the structural complexity of clock networks. Advances in experimental techniques now permit single-cell measurements and the development of single-cell models. Here we present some modeling studies showing the importance of considering both types of noise in understanding how plants adapt to regular and irregular light variations. Stochastic models have proven useful for understanding the effect of regular variations. By contrast, the impact of irregular variations and the interaction of different noise sources are less well studied.
机译：有节奏的行为对植物至关重要。例如，日常（昼夜节律）控制光合作用，而季节性节律则调节其生命周期。昼夜节律时钟的核心是一个遗传网络，可协调昼夜节律中特定时钟基因的表达，以反映24小时昼夜周期。由于时钟基因的低拷贝数和随之而来的细胞间差异，生物钟表现出随机噪声：这种固有噪声通过诱导更鲁棒的振荡行为而在生物钟中起主要作用。噪声的另一个来源是环境，该环境会导致温度和光强度变化：这种外部噪声是时钟网络结构复杂性要求的一部分。实验技术的进步现在允许单细胞测量和单细胞模型的发展。在这里，我们提供一些建模研究，这些研究表明在理解植物如何适应规则和不规则的光照变化时考虑两种噪声的重要性。随机模型已被证明有助于理解规则变化的影响。相比之下，对不规则变化的影响以及不同噪声源之间的相互作用的研究较少。

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