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arXiv 0907.0759q-bio.QM
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基于线性噪声近似的生化动力学参数的贝叶斯推断

Bayesian inference of biochemical kinetic parameters using the linear noise approximation

Michal Komorowski, Barbel Finkenstadt, Claire V. Harper, David A. Rand

摘要:

荧光和发光基因报告使我们能够在单细胞水平上动态定量分子种类浓度随时间的变化。通过多变量动态模型对它们的相互作用进行数学建模,需要开发有效的统计方法,以根据现有数据校准这些模型。由于随机性和噪声在生物化学系统中的普遍存在,随机模型的推断特别令人感兴趣。在本文中,我们提出了一个简单的和计算效率高的算法估计生化动力学参数的基因报告数据。我们使用的线性噪声近似模型的生化反应,通过一个随机动力学模型,基本上近似扩散模型的常微分方程模型与适当定义的噪声过程。可以导出似然函数的显式公式,从而允许计算上有效的参数估计。该算法是嵌入在贝叶斯框架和推理进行马尔可夫链蒙特卡罗。该方法的主要优点是,与更成熟的基于扩散近似的方法相比,不需要计算成本高的数据增强方法。我们的方法还考虑到未观测到的变量和测量误差。模拟和实验数据的方法的应用表明,所提出的方法提供了一个有用的替代扩散近似为基础的方法。

英文摘要:

Fluorescent and luminescent gene reporters allow us to dynamically quantify changes in molecular species concentration over time on the single cell level. The mathematical modeling of their interaction through multivariate dynamical models requires the development of effective statistical methods to calibrate such models against available data. Given the prevalence of stochasticity and noise in biochemical systems inference for stochastic models is of special interest. In this paper we present a simple and computationally efficient algorithm for the estimation of biochemical kinetic parameters from gene reporter data. We use the linear noise approximation to model biochemical reactions through a stochastic dynamic model which essentially approximates a diffusion model by an ordinary differential equation model with an appropriately defined noise process. An explicit formula for the likelihood function can be derived allowing for computationally efficient parameter estimation. The proposed algorithm is embedded in a Bayesian framework and inference is performed using Markov chain Monte Carlo. The major advantage of the method is that in contrast to the more established diffusion approximation based methods the computationally costly methods of data augmentation are not necessary. Our approach also allows for unobserved variables and measurement error. The application of the method to both simulated and experimental data shows that the proposed methodology provides a useful alternative to diffusion approximation based methods.

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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