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Stochastic signalling rewires the interaction map of a multiple feedback network during yeast evolution.
University of Basel, Switzerland.
University of Basel, Switzerland.
University of Basel, Switzerland. (Computational Chemistry and Biochemistry Group)ORCID iD: 0000-0002-6469-0296
University of Basel, Switzerland.
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2012 (English)In: Nature Communications, ISSN 2041-1723, E-ISSN 2041-1723, Vol. 3, p. Article ID: 682-Article in journal (Refereed) Published
Abstract [en]

During evolution, genetic networks are rewired through strengthening or weakening their interactions to develop new regulatory schemes. In the galactose network, the GAL1/GAL3paralogues and the GAL2 gene enhance their own expression mediated by the Gal4p transcriptional activator. The wiring strength in these feedback loops is set by the number of Gal4p binding sites. Here we show using synthetic circuits that multiplying the binding sites increases the expression of a gene under the direct control of an activator, but this enhancement is not fed back in the circuit. The feedback loops are rather activated by genes that have frequent stochastic bursts and fast RNA decay rates. In this way, rapid adaptation to galactose can be triggered even by weakly expressed genes. Our results indicate that nonlinear stochastic transcriptional responses enable feedback loops to function autonomously, or contrary to what is dictated by the strength of interactions enclosing the circuit.

Place, publisher, year, edition, pages
2012. Vol. 3, p. Article ID: 682-
National Category
Bioinformatics and Systems Biology
Research subject
Natural Science, Biochemistry
Identifiers
URN: urn:nbn:se:lnu:diva-34487DOI: 10.1038/ncomms1687OAI: oai:DiVA.org:lnu-34487DiVA, id: diva2:720313
Available from: 2014-05-28 Created: 2014-05-28 Last updated: 2017-12-05Bibliographically approved

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Buetti-Dinh, Antoine

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