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Department of Molecular, Cellular, and Developmental Biology, University of California, Santa Barbara, CA 93106, USA.
A fundamental characteristic of cells is their ability to regulate growth in response to changing environmental conditions. This review focuses on recent progress toward understanding the mechanisms by which bacterial growth is regulated. These phenomena include the 'viable but not culturable' (VBNC) state, in which bacterial growth becomes conditional, and 'persistence', which confers antibiotic resistance to a small fraction of bacteria in a population. Notably, at least one form of persistence appears to involve the generation of nongrowing phenotypic variants after transition through stationary phase. The possible roles of toxin-antitoxin modules in growth control are explored, as well as other mechanisms including contact-dependent growth inhibition, which regulates cellular metabolism and growth through binding to an outer membrane protein receptor.
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