Cited by 438Bacterial Genetics and BiotechnologyGene Regulatory Network AnalysisDiffusion and Search Dynamics

A Stochastic Single-Molecule Event Triggers Phenotype Switching of a Bacterial Cell

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Choi, Paul J., Cai, Long, Frieda, Kirsten, Xie, X. Sunney·2008·Science

Abstract

By monitoring fluorescently labeled lactose permease with single-molecule sensitivity, we investigated the molecular mechanism of how an Escherichia coli cell with the lac operon switches from one phenotype to another. At intermediate inducer concentrations, a population of genetically identical cells exhibits two phenotypes: induced cells with highly fluorescent membranes and uninduced cells with a small number of membrane-bound permeases. We found that this basal-level expression results from partial dissociation of the tetrameric lactose repressor from one of its operators on looped DNA. In contrast, infrequent events of complete dissociation of the repressor from DNA result in large bursts of permease expression that trigger induction of the lac operon. Hence, a stochastic single-molecule event determines a cell's phenotype.

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  1. [6]Monod J Jacob F J. Mol. Biol 1961 3 318 356 13718526
  2. [25]Rezvin A von Hippel PH Biochem 1977 16 4769 4776 20938

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Authors
Choi, P. J., Cai, L., Frieda, K., & Xie, X. S.
Affiliations
Harvard University (US)
Corresponding author
  • Choi, Paul J.
  • Cai, Long
  • Frieda, Kirsten
  • Xie, X. Sunney
Venue
Science
Published
2008-10-17
Volume
322
Issue
5900
Pages
442-446
ISSN
  • 0036-8075 (ISSN-L)
  • 1095-9203
OpenAlex
W1978182054
Cited by
438
References
28
Citations by year
2026: 4 · 2025: 10 · 2024: 13 · 2023: 11 · 2022: 11 · 2021: 14 · 2020: 21 · 2019: 33 · 2018: 28 · 2017: 26 · 2016: 30 · 2015: 27 · 2014: 35 · 2013: 34 · 2012: 37
FWCI
19.62
Type
journal article
Language
en
Open access
Locations
  • Science (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
  • CaltechAUTHORS (California Institute of Technology) (submittedVersion)
  • Digital Access to Scholarship at Harvard (DASH) (Harvard University) (submittedVersion, cc-by)
Funders
  • National Institutes of Health (DP1OD000277)
  • National Institute of Biomedical Imaging and Bioengineering (R01EB010244)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Bacterial Genetics and Biotechnology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Gene Regulatory Network Analysis
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Diffusion and Search Dynamics
Keywords
lac operon, lactose permease, lactose repressor, phenotypic switching, stochastic gene expression, single-molecule fluorescence, Escherichia coli, basal expression, gene expression regulation
MeSH terms
Bacterial Proteins, Escherichia coli, Lac Operon, Lactose, Microscopy, Fluorescence, Models, Genetic, Monosaccharide Transport Proteins, Operator Regions, Genetic, Phenotype, Recombinant Fusion Proteins, Repressor Proteins, RNA, Messenger, Stochastic Processes, Gene Expression Regulation, Bacterial, Feedback, Physiological, Symporters, Escherichia coli Proteins, Lac Repressors

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