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arXiv 1003.5135q-bio.MNcond-mat.stat-mech
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突变-选择平衡下基因调控网络模型中基本相互作用的分布

Distribution of essential interactions in model gene regulatory networks under mutation-selection balance

Z. Burda, A. Krzywicki, O. C. Martin, M. Zagorski

摘要:

基因调控网络通常具有低入度,由此任何给定的基因由网络中的少数基因调控。它们的出度也往往分布很广。什么样的机制可能对这些度分布负责?从一个公认的转录因子与DNA结合的框架开始,我们考虑一个简单的基因调控动力学模型。在那里,我们表明,选择一个目标表达模式导致出现的最低连接兼容的选择性约束。因此,这些基因网络具有低的度,并且“功能性”是简约的,即集中在稀疏数量的相互作用上,例如通过它们的必要性来测量。此外,我们发现转录因子的突变驱动网络具有广泛的出度。最后,这些类别的模型是可进化的,即显著不同的基因型可以在突变选择平衡下逐渐出现。

英文摘要:

Gene regulatory networks typically have low in-degrees, whereby any given gene is regulated by few of the genes in the network. They also tend to have broad distributions for the out-degree. What mechanisms might be responsible for these degree distributions? Starting with an accepted framework of the binding of transcription factors to DNA, we consider a simple model of gene regulatory dynamics. There, we show that selection for a target expression pattern leads to the emergence of minimum connectivities compatible with the selective constraint. As a consequence, these gene networks have low in-degree, and "functionality" is parsimonious, i.e. is concentrated on a sparse number of interactions as measured for instance by their essentiality. Furthermore, we find that mutations of the transcription factors drive the networks to have broad out-degrees. Finally, these classes of models are evolvable, i.e. significantly different genotypes can emerge gradually under mutation-selection balance.

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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