The evolutionary emergence of stochastic phenotype switching in bacteria

The evolutionary emergence of stochastic phenotype switching in bacteria

Rainey, P.B.
Beaumont, H.J.E.
Ferguson, G.C.
Gallie, J.
Kost, C.
Libby, E.
Zhang, X.X.

Applied Sciences

BN/Bionanoscience

2011-08-30

Stochastic phenotype switching – or bet hedging – is a pervasive feature of living systems and common in bacteria that experience fluctuating (unpredictable) environmental conditions. Under such conditions, the capacity to generate variable offspring spreads the risk of being maladapted in the present environment, against offspring likely to have some chance of survival in the future. While a rich subject for theoretical studies, little is known about the selective causes responsible for the evolutionary emergence of stochastic phenotype switching. Here we review recent work – both theoretical and experimental – that sheds light on ecological factors that favour switching types over non-switching types. Of particular relevance is an experiment that provided evidence for an adaptive origin of stochastic phenotype switching by subjecting bacterial populations to a selective regime that mimicked essential features of the host immune response. Central to the emergence of switching types was frequent imposition of ‘exclusion rules’ and ‘population bottlenecks’ – two complementary faces of frequency dependent selection. While features of the immune response, exclusion rules and bottlenecks are likely to operate in many natural environments. Together these factors define a set of selective conditions relevant to the evolution of stochastic switching, including antigenic variation and bacterial persistence.

http://resolver.tudelft.nl/uuid:213381b0-912f-4fa2-ac62-4d24cf87178c

https://doi.org/10.1186/1475-2859-10-S1-S14

BioMed Central

1475-2859

http://www.microbialcellfactories.com/content/10/S1/S14

Microbial Cell Factories, 10 (suppl 1), 2011, Proceedings of the 10th Symposium on Lactic Acid Bacterium

Institutional Repository

journal article

© 2011 The Author(s)
Licensee BioMed Central Ltd.