Motifs in gene transcription regulatory networks

被引:7
作者
Bose, I [1 ]
Ghosh, B [1 ]
Karmakar, R [1 ]
机构
[1] Bose Inst, Dept Phys, Kolkata 700009, W Bengal, India
关键词
gene transcription regulatory network; stochastic gene expression; feed forward loop; noise; natural selection;
D O I
10.1016/j.physa.2004.08.049
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
A brief overview is given of the structure and evolution of gene transcription regulatory networks (GTRNs) of simple organisms like Escherichia coli and yeast Saccharomyces cerevisiae. A prominent motif appearing in the GTRNs is the feed forward loop (FFL). The FFLs have essential functions in gene regulatory processes and it is desirable that the operational noise of a FFL be kept at the minimum for reliability of signal transmission. We calculate the variances around the mean protein levels in the steady states of Type-1 and Type-4 coherent FFLs using a stochastic model of gene expression and the Langevin formalism. The Type-1 FFL is found to be less noisy than the Type-4 FFL. Type-1 FFL motif is more abundant than Type-4 FFL motif in GTRNs. This leads to the conjecture that noise is one of the evolvable traits on which natural selection acts. (C) 2004 Elsevier B.V. All rights reserved.
引用
收藏
页码:49 / 57
页数:9
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