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How environmental factors regulate mutagenesis and gene transfer in microorganisms

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Abstract

This review is focused on the physiological and evolutionary strategies of the processes occurring during the entry of microbial cells into stationary phase and the subsequent period of stasis. The molecular mechanisms adapting microorganisms from exponential growth to a static state involve activation and complex regulation of the stationary factor Sigma-S, which directs RNA polymerase to the specific promoters. As a result the static cells acquire general resistance (simultaneous tolerances) to different environmental stresses. In parallel with the physiological adaptation to stasis, diverse genetical processes are aimed towards resuming the growth of the static cells. Different types of mutagenesis occur: (i) in cells entering stasis and (ii) in static cells (adaptive mutagenesis). Cessation of growth induces the transient hypermutator state resulting in the accumulation of random mutations in the subpopulation of the static cells. If by chance, one or a few of such mutations lead to resumption of division, the growing cell will return to a normal mechanism of spontaneous mutagenesis.

Another mechanism for generating genetical variability in stressed cells involves transposons and conjugative plasmids. Stresses can stimulate the excision of some transposons, which, in turn, can generate chromosomal mutations and activate intracellular mechanisms of mutagenesis. Under stress some conjugative plasmids activate genes encoding antirestriction proteins that repress restriction-modification systems of the recipient cells. Moreover, under stress special cellular mechanisms decrease (alleviate) the activity of restriction-modification systems which, in turn, enhance the probability of gene transfer into the stressed cells.

Under stress, the efficiency of inter-species genetical barriers also decreases. This, stimulates inter-species gene transfer and may lead to a burst of incipient speciation in the population of non-growing cells. After resumption of growth the genetical barriers leading to isolation will be restored.

In general, the cessation of growth “switches on”, and resumption of growth “switches off”, a set of special processes that are responsible for generating bursts of genetical variability in populations of microorganisms.

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  1. Institute of Biochemistry and Physiology of Microorganisms, Russian Academy of Sciences, 142292, Pushchino, Moscow Region, Russia

    Vassili V. Velkov

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This article is dedicated to the memory of Nikolai V Timofeev-Ressovsky (1900–1981).

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Velkov, V.V. How environmental factors regulate mutagenesis and gene transfer in microorganisms. J. Biosci. 24, 529–559 (1999). https://doi.org/10.1007/BF02942664

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