arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1708.09264q-bio.QMq-bio.MN
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生化反应中的随机性或噪声

Stochasticity or Noise in Biochemical Reactions

Zachary Fox, Brian Munsky

摘要:

即使当细胞处于同质环境中时,跨同基因细胞群体的基因表达的异质性也可以引起表型多样性。这种多样性源于生物化学反应的离散性和随机性,而这种生物化学反应是由于单个细胞中基因、RNA或蛋白质分子的数量非常少而自然产生的。对单个生物分子的现代测量已经创造了关于这些分子波动的大量信息,但是对这些复杂的随机系统的定量理解需要精确的计算工具。在这篇文章中,我们提出了必要的现代工具来模拟生物系统中的变异性,并将模型结果与实验数据进行比较。我们回顾了化学主方程和方法来解决离散数量的生物分子的概率分布。我们讨论了如何使用基于似然的方法将概率分布拟合到单细胞数据。最后,我们提供了拟合离散随机模型的例子,以单分子荧光原位杂交数据,定量在细菌和酵母细胞群体的RNA水平。

英文摘要:

Heterogeneity in gene expression across isogenic cell populations can give rise to phenotypic diversity, even when cells are in homogenous environments. This diversity arises from the discrete, stochastic nature of biochemical reactions, which naturally arise due to the very small numbers of genes, RNA, or protein molecules in single cells. Modern measurements of single biomolecules have created a vast wealth of information about the fluctuations of these molecules, but a quantitative understanding of these complex, stochastic systems requires precise computational tools. In this article, we present modern tools necessary to model variability in biological system and to compare model results to experimental data. We review the Chemical Master Equation and approaches to solve for probability distributions of discrete numbers of biomolecules. We discuss how to fit probability distributions to single-cell data using likelihood based approaches. Finally, we provide examples of fitting discrete stochastic models to single-molecule fluorescent in-situ hybridization data that quantifies RNA levels across populations of cells in bacteria and yeast.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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