arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1105.0624q-bio.MNcs.DSmath.ACmath.CAmath.COmath.DS
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生化网络分解揭示了绝对浓度鲁棒性

Biochemical network decomposition reveals absolute concentration robustness

Jost Neigenfind, Sergio Grimbs, Zoran Nikoloski

摘要:

生物化学系统的鲁棒性已成为系统生物学的核心问题之一,虽然它是出了名的难以正式捕捉其多方面的性质。正常系统功能的维持不仅取决于潜在的相关组分的化学计量,而且还取决于大量的动力学参数。对于给定的参数值,最近的研究结果旨在表征系统组分的性质,以在所得到的稳定状态下表现出相同的浓度,称为绝对浓度稳健性(ACR)。然而,现有的方法用于确定系统组件展示ACR是只适用于一类的质量作用网络,该属性可以被确认,但不丢弃。在这里,我们设计了一种新的方法,它依赖于生化网络分解成子网络,称为基本通量模式,以确定ACR在一个更广泛的类的质量作用网络,仅使用给定的化学计量。这种方法将确定ACR的问题减少到求解参数化线性方程组的问题,使其适合于更大规模的网络。我们的统一框架将有助于分析这种生物学上重要类型的鲁棒性,以及检测新的系统特性,独立于更复杂的生化网络的动力学参数。

英文摘要:

Robustness of biochemical systems has become one of the central questions in Systems Biology, although it is notoriously difficult to formally capture its multifaceted nature. Maintenance of normal system function depends not only on the stoichiometry of the underlying interrelated components, but also on a multitude of kinetic parameters. For given parameter values, recent findings have aimed at characterizing the property of the system components to exhibit same concentrations in the resulting steady states, termed absolute concentration robustness (ACR). However, the existing method for determining system components exhibiting ACR is applicable only to one class of mass-action networks for which this property can be confirmed, but not discarded. Here we design a new method which relies on biochemical network decompositions into subnetworks, called elementary flux modes, to identify ACR in a broader class of mass-action networks by using only the given stoichiometry. This approach reduces the problem of determining ACR to that of solving parameterized systems of linear equations, rendering it amenable to networks of larger sizes. Our unified framework will be helpful in analyzing this biologically important type of robustness as well as detection of novel systemic properties independent of the kinetic parameters for more complex biochemical networks.

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