Expression patterns of core metabolic genes and elevated intracellular ROS confer drug tolerance in Staphylococcus...

Area of Science:

• Microbiology
• Molecular Biology
• Drug Resistance

Background:

• Staphylococcus aureus exhibits significant antibiotic tolerance, contributing to treatment failures and resistance.
• The metabolic underpinnings of this drug tolerance are not fully understood.
• Identifying key metabolic genes is crucial for developing new therapeutic strategies.

Purpose of the Study:

• To identify core metabolic genes contributing to antibiotic tolerance in S. aureus.
• To investigate the role of metabolic alterations and reactive oxygen species (ROS) in drug tolerance.
• To explore potential therapeutic targets for combating tolerant S. aureus infections.

Main Methods:

• Proteomic analysis of tolerant S. aureus isolates.
• Gene complementation assays to confirm gene function.
• Measurement of intracellular ROS levels and assessment of ROS scavenger effects.

Main Results:

• Seven specific metabolic genes (NWMN_0676-0677, opuCB, gltD, adhE, clpP, rarA) were identified as major contributors to tolerance.
• Tolerant strains showed elevated intracellular ROS levels.
• Treatment with ROS scavengers enhanced antibiotic sensitivity in tolerant strains.

Conclusions:

• Shifts in core metabolic gene expression are critical for S. aureus antibiotic tolerance.
• Regulation of ROS metabolism is a central mechanism in these metabolic adaptations.
• Targeting metabolic genes and ROS pathways offers a promising strategy against drug-tolerant S. aureus.