Nutrient factor-dependent performance of bacterial quorum sensing system during population evolution

Area of Science:

• Microbiology
• Bacterial Physiology
• Systems Biology

Background:

• Bacterial quorum sensing (QS) regulates costly public good production.
• Environmental factors influence QS-mediated cooperation and metabolism.
• The specific role of nutrient availability in QS remains unclear.

Purpose of the Study:

• To investigate how nutrient factors affect QS system performance in Pseudomonas aeruginosa.
• To understand the coordination between QS, public goods, and intracellular metabolism under nutrient limitation.
• To explore the impact of nutrient limitation on population structure and evolution.

Main Methods:

• Culturing Pseudomonas aeruginosa under diverse nutrient and culture conditions.
• Comparative transcriptomic analyses to identify gene expression changes.
• Evolutionary experiments to observe population dynamics.

Main Results:

• Carbon source limitation was identified as the primary suppressor of QS activation.
• Phosphorus limitation, in the short term, induced a significant number of public-good-encoding genes.
• Different nutrient limitations differentially affected population structure by coordinating public goods and primary metabolism, including starch and sucrose metabolism.

Conclusions:

• Quorum sensing (QS) pleiotropically balances cooperative behavior and metabolism in bacteria.
• Nutrient availability critically shapes QS-mediated interactions and bacterial population dynamics.
• Findings offer insights into QS's role in persistent infections.