Quantitative Biology > Molecular Networks
[Submitted on 1 Nov 2003]
Title:Enhancement of the stability of genetic switches by overlapping upstream regulatory domains
View PDFAbstract: We study genetic switches formed from pairs of mutually repressing operons. The switch stability is characterised by a well defined lifetime which grows sub-exponentially with the number of copies of the most-expressed transcription factor, in the regime accessible by our numerical simulations. The stability can be markedly enhanced by a suitable choice of overlap between the upstream regulatory domains. Our results suggest that robustness against biochemical noise can provide a selection pressure that drives operons, that regulate each other, together in the course of evolution.
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