Abstract:
:Stochastic fluctuations (noise) in gene expression can cause members of otherwise genetically identical populations to display drastically different phenotypes. An understanding of the sources of noise and the strategies cells employ to function reliably despite noise is proving to be increasingly important in describing the behavior of natural organisms and will be essential for the engineering of synthetic biological systems. Here we describe the design of synthetic constructs, termed ribosome competing RNAs (rcRNAs), as a means to rationally perturb noise in cellular gene expression. We find that noise in gene expression increases in a manner proportional to the ability of an rcRNA to compete for the cellular ribosome pool. We then demonstrate that operons significantly buffer noise between coexpressed genes in a natural cellular background and can even reduce the level of rcRNA enhanced noise. These results demonstrate that synthetic genetic constructs can significantly affect the noise profile of a living cell and, importantly, that operons are a facile genetic strategy for buffering against noise.
journal_name
Mol Biosystjournal_title
Molecular bioSystemsauthors
Tabor JJ,Bayer TS,Simpson ZB,Levy M,Ellington ADdoi
10.1039/b801245hsubject
Has Abstractpub_date
2008-07-01 00:00:00pages
754-61issue
7eissn
1742-206Xissn
1742-2051journal_volume
4pub_type
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