arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1202.0694q-bio.MNcond-mat.other
收藏

基于分子衰变率变化的细胞分化自组织模型

A self-organized model for cell-differentiation based on variations of molecular decay rates

Rudolf Hanel, Manfred Pöchacker, Manuel Schölling, Stefan Thurner

摘要:

活细胞的系统特性是由所谓的遗传调控网络(GRN)控制的分子动力学的结果。这些网络捕捉细胞的所有可能特征,并负责生命系统特有的巨大适应水平。在任何时间点,只有这些网络的一小部分是活跃的。GRN的任何活性子集导致特定分子组的表达(表达模式)。活跃网络的子集随着时间的推移而变化,导致观察到的表达模式的复杂动态。对这种动力学的理解在系统生物学和医学中变得越来越重要。虽然转录速率和催化相互作用的重要性已被广泛认识到在建模遗传调控系统,降解的生化试剂(mRNA,蛋白质)在监管动态的作用的理解仍然有限。最近的实验数据表明,mRNA和蛋白质的衰变率和表达模式之间存在函数关系。在本文中,我们提出了一个模型的动态序列的活动子网络的GRN。该模型能够再现分子动力学的关键特征,包括稳态、多稳定性、周期动力学、交替活动、可微性和自组织临界动力学。此外,该模型允许自然地理解衰变率和表达模式之间关系背后的机制。该模型解释了最近的实验观察,衰变率(或营业额)在一般的系统水平分化的组织类之间的变化,并突出了细胞内衰变率控制机制在细胞分化的作用。

英文摘要:

Systemic properties of living cells are the result of molecular dynamics governed by so-called genetic regulatory networks (GRN). These networks capture all possible features of cells and are responsible for the immense levels of adaptation characteristic to living systems. At any point in time only small subsets of these networks are active. Any active subset of the GRN leads to the expression of particular sets of molecules (expression modes). The subsets of active networks change over time, leading to the observed complex dynamics of expression patterns. Understanding of this dynamics becomes increasingly important in systems biology and medicine. While the importance of transcription rates and catalytic interactions has been widely recognized in modeling genetic regulatory systems, the understanding of the role of degradation of biochemical agents (mRNA, protein) in regulatory dynamics remains limited. Recent experimental data suggests that there exists a functional relation between mRNA and protein decay rates and expression modes. In this paper we propose a model for the dynamics of successions of sequences of active subnetworks of the GRN. The model is able to reproduce key characteristics of molecular dynamics, including homeostasis, multi-stability, periodic dynamics, alternating activity, differentiability, and self-organized critical dynamics. Moreover the model allows to naturally understand the mechanism behind the relation between decay rates and expression modes. The model explains recent experimental observations that decay-rates (or turnovers) vary between differentiated tissue-classes at a general systemic level and highlights the role of intracellular decay rate control mechanisms in cell differentiation.

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。

↑