Population Dynamics of a Two Phages-One Host Infection System Using Escherichia coli Strain ECOR57 and Phages vB_EcoP_SU10 and vB_EcoD_SU57Koonjan, Shazeeda; Palacios, Carlos Cardoso; Nilsson, Anders S.;
In this study, we looked at the population dynamics of a two phages-one host system using phages vB_EcoP_SU10 (SU10) and vB EcoD SU57 (SU57) and the bacteria Escherichia coli, strain ECOR57. Phage-specific growth curves were observed where infections by SU10 resulted in a moderate production of phages and infections by SU57 resulted in a fast and extensive production of phage progeny. Sequentially adding SU10 followed by SU57 did not produce a significant change in growth rates, whereas adding SU57 followed by SU10 resulted in a decrease in SU10 titer The efficiency of the plating assays showed that ECOR57 exhibited a resistance spectrum after infection by both the single and combined phages. Phage-resistant bacteria exhibited four different morphotypes (i.e., normal, slimy, edgy, and pointy). The normal and edgy morphotypes had a high frequency of developing resistance. Bacterial growth and biofilm assays indicated that the edgy and pointy morphotypes reached a stationary phase faster and produced more biofilm compared to the wild type. These findings suggest that the dynamic structure of phage-bacteria communities dictate resistance evolution and development. Understanding when and how resistances arise and phage(s)-hosts interactions could aid in the design of phage therapy treatments.
population dynamics; chemostat; evolution; coevolution; resistance; cross-resistance; phage therapy; diversity; microbiome
Published inPharmaceuticals 2022, volume: 15, number: 3, article number: 268
UKÄ Subject classification
Microbiology in the medical area
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