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Updated: Dec 23, 2025

Replication of the Ordered, Nonredundant Library of Pseudomonas aeruginosa strain PA14 Transposon Insertion Mutants
Published on: May 4, 2018
Allelic polymorphism shapes community function in evolving Pseudomonas aeruginosa populations
Sheyda Azimi1,2, Aled E L Roberts3, Shengyun Peng2
1Center for Microbial Dynamics & Infection, Georgia Institute of Technology, Atlanta, GA, USA.
Pseudomonas aeruginosa populations in cystic fibrosis lungs evolve rapidly, losing social behaviors and gaining antibiotic resistance. This study reveals how genetic diversity impacts bacterial communities and virulence.
Area of Science:
- Microbiology
- Evolutionary Biology
- Genomics
Background:
- Pseudomonas aeruginosa chronically infects cystic fibrosis lungs, forming antibiotic-resistant biofilms.
- Population heterogeneity in P. aeruginosa impacts social behaviors and community function, which remains poorly understood.
Purpose of the Study:
- To investigate how P. aeruginosa heterogeneity impacts behavioral traits and antibiotic tolerance.
- To analyze genomic changes during evolution in a synthetic sputum medium.
Main Methods:
- Evolved P. aeruginosa strain PAO1 in biofilms for 50 days in synthetic sputum medium.
- Measured social trait production and antibiotic tolerance.
- Utilized metagenomic sequencing to assess genomic changes.
Main Results:
- Evolutionary trajectories were reproducible across independent populations.
- Significant genomic diversity emerged within the first 10 days.
- Evolution selected for decreased quorum sensing (QS) and QS-dependent traits.
- Increased lasR mutant frequency correlated with loss of protease, decreased 3O-C12-HSL, and enhanced beta-lactam antibiotic resistance.
Conclusions:
- P. aeruginosa population dynamics and genetic diversity influence virulence traits.
- Evolution in sputum selects for decreased QS and increased antibiotic tolerance.
- Allelic polymorphism impacts community functions and antibiotic resistance in P. aeruginosa.
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