--- _id: '3755' abstract: - lang: eng text: A primitive example of adaptation in gene expression is the balance between the rate of synthesis and degradation of cellular RNA, which allows rapid responses to environmental signals. Here, we investigate how multidrug efflux pump systems mediate the dynamics of a simple drug-inducible system in response to a steady level of inducer. Using fluorescence correlation spectroscopy, we measured in real time within a single bacterium the transcription activity at the RNA level of the acrAB-TolC multidrug efflux pump system. When cells are exposed to constant level of anhydrotetracycline inducer and are adsorbed onto a poly-L-lysine-coated surface, we found that the acrAB-TolC promoter is steadily active. We also monitored the activity of the tet promoter to characterize the effect of this efflux system on the dynamics of drug-inducible transcription. We found that the transcriptional response of the tet promoter to a steady level of aTc rises and then falls back to its preinduction level. The rate of RNA degradation was constant throughout the transcriptional pulse, indicating that the modulation of intracellular inducer concentration alone can produce this pulsating response. Single-cell experiments together with numerical simulations suggest that such pulsating response in drug-inducible genetic systems is a property emerging from the dependence of drug-inducible transcription on multidrug efflux systems. author: - first_name: Thuc full_name: Le,Thuc T. last_name: Le - first_name: Thierry full_name: Emonet,Thierry last_name: Emonet - first_name: Sébastien full_name: Harlepp, Sébastien last_name: Harlepp - first_name: Calin C full_name: Calin Guet id: 47F8433E-F248-11E8-B48F-1D18A9856A87 last_name: Guet orcid: 0000-0001-6220-2052 - first_name: Philippe full_name: Cluzel,Philippe last_name: Cluzel citation: ama: Le T, Emonet T, Harlepp S, Guet CC, Cluzel P. Dynamical determinants of drug-inducible gene expression in a single bacterium. Biophysical Journal. 2006;90(9):3315-3321. doi:10.1529/biophysj.105.073353 apa: Le, T., Emonet, T., Harlepp, S., Guet, C. C., & Cluzel, P. (2006). Dynamical determinants of drug-inducible gene expression in a single bacterium. Biophysical Journal. Biophysical Society. https://doi.org/10.1529/biophysj.105.073353 chicago: Le, Thuc, Thierry Emonet, Sébastien Harlepp, Calin C Guet, and Philippe Cluzel. “Dynamical Determinants of Drug-Inducible Gene Expression in a Single Bacterium.” Biophysical Journal. Biophysical Society, 2006. https://doi.org/10.1529/biophysj.105.073353. ieee: T. Le, T. Emonet, S. Harlepp, C. C. Guet, and P. Cluzel, “Dynamical determinants of drug-inducible gene expression in a single bacterium,” Biophysical Journal, vol. 90, no. 9. Biophysical Society, pp. 3315–3321, 2006. ista: Le T, Emonet T, Harlepp S, Guet CC, Cluzel P. 2006. Dynamical determinants of drug-inducible gene expression in a single bacterium. Biophysical Journal. 90(9), 3315–3321. mla: Le, Thuc, et al. “Dynamical Determinants of Drug-Inducible Gene Expression in a Single Bacterium.” Biophysical Journal, vol. 90, no. 9, Biophysical Society, 2006, pp. 3315–21, doi:10.1529/biophysj.105.073353. short: T. Le, T. Emonet, S. Harlepp, C.C. Guet, P. Cluzel, Biophysical Journal 90 (2006) 3315–3321. date_created: 2018-12-11T12:04:59Z date_published: 2006-01-01T00:00:00Z date_updated: 2021-01-12T07:51:58Z day: '01' doi: 10.1529/biophysj.105.073353 extern: 1 intvolume: ' 90' issue: '9' main_file_link: - open_access: '1' url: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1432126/ month: '01' oa: 1 page: 3315 - 3321 publication: Biophysical Journal publication_status: published publisher: Biophysical Society publist_id: '2472' quality_controlled: 0 status: public title: Dynamical determinants of drug-inducible gene expression in a single bacterium type: journal_article volume: 90 year: '2006' ...