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Antimicrobial Resistance in Bacteria: Mechanisms, Evolution, and Persistence
Eirini Christaki1,2, Markella Marcou3,4, Andreas Tofarides5
1Medical School, University of Cyprus, Nicosia, Cyprus. christaki.eirini@ucy.ac.cy.
Journal of Molecular Evolution
|October 30, 2019
Summary
Antimicrobial resistance is a growing global threat due to widespread antimicrobial use. Understanding the evolution of resistance mechanisms is crucial for developing new strategies against superbugs.
Area of Science:
- Microbiology
- Evolutionary Biology
- Public Health
Background:
- Antimicrobial resistance (AMR) is a significant global health crisis, with multidrug-resistant bacteria becoming increasingly prevalent worldwide.
- The extensive use, overuse, and misuse of antimicrobials over the past 80 years have significantly contributed to the rapid emergence and spread of AMR.
- Ancient molecular pathways and environmental resistance genes represent ancestral mechanisms that can evolve into modern resistance determinants.
Purpose of the Study:
- To provide a comprehensive overview of the diverse mechanisms underlying antimicrobial resistance in bacteria.
- To explore the evolutionary history and ongoing emergence of these resistance mechanisms.
- To highlight the need for novel antimicrobial strategies by understanding factors driving AMR persistence and spread.
Main Methods:
- This review synthesizes existing scientific literature on antimicrobial resistance mechanisms.
- It examines the evolutionary trajectory of resistance determinants from ancient origins to contemporary clinical challenges.
- The review analyzes the role of environmental factors, including sub-inhibitory antibiotic concentrations, in fostering novel resistance.
Main Results:
- Antimicrobial resistance mechanisms have ancient roots and are continuously evolving.
- Environmental reservoirs harbor numerous potential resistance genes, though their expression in pathogenic bacteria remains unpredictable.
- Exposure to antibiotics, even at sub-inhibitory levels, can drive the emergence of new resistance strategies.
Conclusions:
- A deeper understanding of AMR evolution and spread is essential for combating the global health threat posed by superbugs.
- Identifying critical factors influencing AMR persistence can inform the development of innovative therapeutic targets.
- New antimicrobial strategies are urgently needed to circumvent existing and emerging resistance mechanisms.
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