Robitaille, Sophie; Groleau, Marie-Christine et Déziel, Éric 
ORCID: https://orcid.org/0000-0002-4609-0115
(2020).
Swarming Motility Growth Favors the Emergence of a Subpopulation of Pseudomonas aeruginosa Quorum Sensing Mutants
Environmental Microbiology
, vol. 22
, nº 7.
pp. 2892-2906.
DOI: 10.1111/1462-2920.15042.
Résumé
Pseudomonas aeruginosa exploits several types of motility behaviors to colonize diverse environments. One of these is swarming motility, a coordinated group movement on a semi-solid surface. This bacterium needs to express a functional flagellum and produce rhamnolipids to display this type of social motility. A DeltahptB mutant, a gene part of the Gac/Rsm signaling pathway, produces rhamnolipids and expresses a functional flagellum but has an important swarming defect. Experimental directed evolution was performed on this mutant under swarming conditions to obtain compensatory mutations and thus identify genes responsible for its deficient swarming phenotype. Unexpectedly, a gain-of-function subpopulation emerged from this evolution with mutations in lasR, which codes for a key quorum sensing transcriptional regulator. Furthermore, we found that lasR(-) mutants even emerge at high frequencies in the wild-type strain when using the same experimental evolution strategy. The resulting evolved population, largely composed of LasR-defective mutants, is fitter than the original strain in swarming motility. We also established that lasR(-) mutants have a growth advantage under swarming conditions when compared to wild-type. Our results demonstrate that a social phenotype, i.e. swarming motility, favors the emergence of mutants deficient in a quorum sensing regulatory pathway to the benefit of the whole population. This article is protected by copyright. All rights reserved.
| Type de document: | Article |
|---|---|
| Mots-clés libres: | - |
| Centre: | Centre INRS-Institut Armand Frappier |
| Date de dépôt: | 20 juill. 2021 04:08 |
| Dernière modification: | 07 févr. 2022 16:01 |
| URI: | https://espace.inrs.ca/id/eprint/11673 |
Gestion Actions (Identification requise)
 |
Modifier la notice |