Pseudomonas Aeruginosa Adaptation in Cystic Fibrosis Infections

Pseudomonas aeruginosa establishes chronic respiratory infections in individuals with cystic fibrosis through a combination of genetic diversification, phenotypic plasticity and biofilm formation. Within the heterogeneous environment of the CF lung—characterised by oxygen gradients, immune pressure and repeated antibiotic exposure—this opportunistic pathogen undergoes directional selection for traits that promote persistence. Key adaptive strategies include the transition from acute virulence to a biofilm-associated lifestyle, the emergence of hypermutator sub-populations, metabolic reprogramming for anaerobic growth and fine-tuned regulation of virulence via small RNAs and secondary messengers. Resulting within-host diversity not only complicates treatment by fostering antibiotic resistance but also offers potential biomarkers and therapeutic targets to disrupt chronic colonisation.

Research from Nature Portfolio

Recent studies have uncovered a small non-coding RNA that orchestrates the switch between chronic and acute P. aeruginosa lifestyles by modulating anaerobic ubiquinone biosynthesis under low-oxygen conditions. This regulatory RNA serves as a biomarker for the dispersal of chronic infections into acute septicaemia. In parallel, investigations of mixed-strain populations within CF airways reveal that pre-existing resistant lineages accelerate antibiotic resistance evolution compared with single-strain infections, highlighting the role of within-host diversity in shaping treatment outcomes. Complementary mapping of evolutionary trajectories across early colonisation demonstrates a 2–3-year window of rapid adaptation, distinct “naïve” and “adapted” states, and multiple convergent modes leading to persistence, thereby informing precision-guided interventions.

Pseudomonas Aeruginosa Adaptation in Cystic Fibrosis Infections publication trend

The graph below shows the total number of articles in pseudomonas aeruginosa adaptation in cystic fibrosis infections across all publications each year (not limited to Nature Index journals).

Technical terms

Biofilm: Structured community of bacteria encased in a self-produced extracellular matrix attached to a surface.

Hypermutator: Bacterial strain with defective DNA repair mechanisms leading to elevated spontaneous mutation rates.

Small RNA: Short non-coding RNA molecule that regulates gene expression at the post-transcriptional level.

Twitching motility: Surface translocation mediated by extension and retraction of type IV pili.

Cyclic-di-GMP: Intracellular secondary messenger that controls the transition between motile and sessile bacterial lifestyles.

References

1. A Pseudomonas aeruginosa small RNA regulates chronic and acute infection. Nature (2023).
2. Mixed strain pathogen populations accelerate the evolution of antibiotic resistance in patients. Nature Communications (2023).
3. Evolutionary highways to persistent bacterial infection. Nature Communications (2019).
4. Secondary messenger signalling influences Pseudomonas aeruginosa adaptation to sinus and lung environments. The ISME Journal: Multidisciplinary Journal of Microbial Ecology (2024).
5. Pseudomonas aeruginosa Evolutionary Adaptation and Diversification in Cystic Fibrosis Chronic Lung Infections. Trends in Microbiology (2016).
6. Pseudomonas aeruginosa Diversification during Infection Development in Cystic Fibrosis Lungs—A Review. Pathogens (2014).
7. Pseudomonas aeruginosa: An Audacious Pathogen with an Adaptable Arsenal of Virulence Factors. International Journal of Molecular Sciences (2021).