Bistability and oscillations in co-repressive synthetic microbial consortia

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dc.citation.firstpage55en_US
dc.citation.issueNumber1en_US
dc.citation.journalTitleQuantitative Biologyen_US
dc.citation.lastpage66en_US
dc.citation.volumeNumber5en_US
dc.contributor.authorSadeghpour, Mehdien_US
dc.contributor.authorVeliz-Cuba, Alanen_US
dc.contributor.authorOrosz, Gáboren_US
dc.contributor.authorJosić, Krešimiren_US
dc.contributor.authorBennett, Matthew R.en_US
dc.contributor.orgBioengineeringen_US
dc.contributor.orgBiosciencesen_US
dc.date.accessioned2017-07-27T17:40:18Zen_US
dc.date.available2017-07-27T17:40:18Zen_US
dc.date.issued2017en_US
dc.description.abstractBackground: Synthetic microbial consortia are conglomerations of genetically engineered microbes programmed to cooperatively bring about population-level phenotypes. By coordinating their activity, the constituent strains can display emergent behaviors that are difficult to engineer into isogenic populations. To do so, strains are engineered to communicate with one another through intercellular signaling pathways that depend on cell density. Methods: Here, we used computational modeling to examine how the behavior of synthetic microbial consortia results from the interplay between population dynamics governed by cell growth and internal transcriptional dynamics governed by cell-cell signaling. Specifically, we examined a synthetic microbial consortium in which two strains each produce signals that down-regulate transcription in the other. Within a single strain this regulatory topology is called a “co-repressive toggle switch” and can lead to bistability. Results: We found that in co-repressive synthetic microbial consortia the existence and stability of different states depend on population-level dynamics. As the two strains passively compete for space within the colony, their relative fractions fluctuate and thus alter the strengths of intercellular signals. These fluctuations drive the consortium to alternative equilibria. Additionally, if the growth rates of the strains depend on their transcriptional states, an additional feedback loop is created that can generate oscillations. Conclusions: Our findings demonstrate that the dynamics of microbial consortia cannot be predicted from their regulatory topologies alone, but are also determined by interactions between the strains. Therefore, when designing synthetic microbial consortia that use intercellular signaling, one must account for growth variations caused by the production of protein.en_US
dc.identifier.citationSadeghpour, Mehdi, Veliz-Cuba, Alan, Orosz, Gábor, et al.. "Bistability and oscillations in co-repressive synthetic microbial consortia." <i>Quantitative Biology,</i> 5, no. 1 (2017) Springer: 55-66. https://doi.org/10.1007/s40484-017-0100-y.en_US
dc.identifier.digitalBistability_and_oscillationsen_US
dc.identifier.doihttps://doi.org/10.1007/s40484-017-0100-yen_US
dc.identifier.urihttps://hdl.handle.net/1911/95527en_US
dc.language.isoengen_US
dc.publisherSpringeren_US
dc.rightsThis is an author's peer-reviewed final manuscript, as accepted by the publisher. The published article is copyrighted by Springer.en_US
dc.subject.keywordsynthetic biologyen_US
dc.subject.keywordmicrobial consortiaen_US
dc.subject.keywordquorum sensingen_US
dc.subject.keywordrelaxation oscillationsen_US
dc.titleBistability and oscillations in co-repressive synthetic microbial consortiaen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpost-printen_US
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