Correlated Phenotypic Transitions to Competence in Bacterial Colonies

Details Correlated Phenotypic Transitions to Competence in Bacterial Colonies Correlated Phenotypic Transitions to Competence in Bacterial Colonies

2007-11-04

arxiv.org/abs/0711.0554v1

Biology

Quantitative Biology

Molecular Networks

Scientific paper

10.1103/PhysRevE.76.040901

Genetic competence is a phenotypic state of a bacterial cell in which it is capable of importing DNA, presumably to hasten its exploration of alternate genes in its quest for survival under stress. Recently, it was proposed that this transition is uncorrelated among different cells in the colony. Motivated by several discovered signaling mechanisms which create colony-level responses, we present a model for the influence of quorum-sensing signals on a colony of B. Subtilis cells during the transition to genetic competence. Coupling to the external signal creates an effective inhibitory mechanism, which results in anti-correlation between the cycles of adjacent cells. We show that this scenario is consistent with the specific experimental measurement, which fails to detect some underlying collective signaling mechanisms. Rather, we suggest other parameters that should be used to verify the role of a quorum-sensing signal. We also study the conditions under which phenotypic spatial patterns may emerge.

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