Epistasis between antibiotic tolerance, persistence, and resistance mutations

Area of Science:

• Microbiology
• Evolutionary Biology
• Genetics

Background:

• Antibiotic resistance is a major public health concern.
• Understanding microbial evolution under antibiotic pressure is critical.
• Epistasis (gene interaction) in resistance mutations is well-studied, but tolerance interactions are not.

Purpose of the Study:

• To investigate the epistasis between antibiotic resistance and tolerance mutations.
• To model the dynamics of bacterial survival under antibiotic treatment.
• To examine tolerance evolution in Escherichia coli with different antibiotic classes.

Main Methods:

• Experimental evolution of Escherichia coli.
• Measurement of epistasis between tolerance and resistance mutations.
• Mathematical modeling of bacterial survival dynamics.

Main Results:

• Tolerance and resistance mutations exhibit synergistic interactions.
• Synergistic epistasis was observed in strains evolved under intermittent antibiotic treatment.
• This synergy persists even when considering population heterogeneity (antibiotic persistence).

Conclusions:

• The interaction between antibiotic resistance and tolerance is synergistic.
• This framework applies to various microbial and cellular systems under stress.
• Findings offer insights into microbial adaptation and treatment resistance.