A stochastic single-molecule event triggers phenotype switching of a bacterial cell.

A stochastic single-molecule event triggers phenotype switching of a bacterial cell.
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DOI:
10.1126/science.1161427
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发表时间:
2008-10-17
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Xie XS
Xie XS
中科院分区:
其他
文献类型:
--
作者:
Choi PJ;Cai L;Frieda K;Xie XS

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We investigate the molecular mechanism of how an E. coli cell with the lac operon switches from one phenotype to another by monitoring fluorescently labeled lactose permease with single-molecule sensitivity. 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 find 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 molecular event determines a cell’s phenotype.
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