Stochastic pulsing of gene expression enables the generation of spatial patterns in Bacillus subtilis biofilms

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Nadezhdin, Eugene 
Murphy, Niall 
Locke, James C. W. 

Abstract: Stochastic pulsing of gene expression can generate phenotypic diversity in a genetically identical population of cells, but it is unclear whether it has a role in the development of multicellular systems. Here, we show how stochastic pulsing of gene expression enables spatial patterns to form in a model multicellular system, Bacillus subtilis bacterial biofilms. We use quantitative microscopy and time-lapse imaging to observe pulses in the activity of the general stress response sigma factor σB in individual cells during biofilm development. Both σB and sporulation activity increase in a gradient, peaking at the top of the biofilm, even though σB represses sporulation. As predicted by a simple mathematical model, increasing σB expression shifts the peak of sporulation to the middle of the biofilm. Our results demonstrate how stochastic pulsing of gene expression can play a key role in pattern formation during biofilm development.

Article, /631/136/756, /631/326/41/2482, /631/326/41/88, /631/326/46, article
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Nature Communications
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Nature Publishing Group UK