Antibiotic tolerance, persistence, and resistance of the evolved minimal cell, Mycoplasma mycoides JCVI-Syn3B

Area of Science:

• Microbiology and Molecular Biology
• Synthetic Biology
• Antibiotic Resistance Research

Background:

• Antibiotic resistance is a significant global health threat, exacerbated by bacterial tolerance and persistence.
• Antibiotic persisters, a dormant subpopulation, contribute to relapsing infections and the evolution of resistance.
• Understanding bacterial survival mechanisms is crucial for developing new therapeutic strategies.

Purpose of the Study:

• To investigate essential mechanisms of antibiotic survival using a synthetically developed minimal cell, JCVI-Syn3B.
• To leverage the reduced complexity of the minimal cell to uncover fundamental biological principles of antibiotic evasion.

Main Methods:

• Utilized the minimal cell JCVI-Syn3B, comprising 473 essential genes, for antibiotic survival studies.
• Examined the minimal cell's capacity to evolve antibiotic resistance and its tolerance/persistence against various antibiotics.
• Analyzed the presence of known persister-related genes within the minimal cell's genetic makeup.

Main Results:

• JCVI-Syn3B expeditiously evolved antibiotic resistance to different classes of antibiotics.
• The minimal cell demonstrated tolerance and persistence against multiple antibiotics.
• While containing some known persister genes, Syn3B lacked several systems previously associated with persistence, such as toxin-antitoxin systems.

Conclusions:

• The minimal cell JCVI-Syn3B serves as a powerful model for studying antibiotic survival mechanisms due to its simplified genetic architecture.
• Bacterial persistence and tolerance can occur through mechanisms not solely reliant on previously identified pathways.
• Further research with minimal cells can reveal novel insights into antibiotic evasion and inform the development of strategies to combat antibiotic resistance.