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Gamma-Mobile-Trio systems are mobile elements rich in bacterial defensive and offensive tools
Tridib Mahata1, Katarzyna Kanarek1, Moran G Goren1
1Department of Clinical Microbiology and Immunology, School of Medicine, Faculty of Medical and Health Sciences, Tel Aviv University, Tel Aviv, Israel.
Nature Microbiology
|October 24, 2024
Summary
Bacterial Gamma-Mobile-Trio (GMT) islands are mobile genetic elements carrying diverse anti-phage and antibacterial tools. These islands, including the GAPS1 system triggered by phage proteins, highlight the interconnectedness of bacterial defense and offense.
Area of Science:
- Microbiology
- Genomics
- Evolutionary Biology
Background:
- The co-evolution of bacteria and phages has driven the development of bacterial immune systems.
- The full diversity and dynamics of these bacterial defense mechanisms are not well understood.
Purpose of the Study:
- To characterize a widespread genetic element, the Gamma-Mobile-Trio (GMT) system, as a reservoir of bacterial offensive and defensive tools.
- To investigate the mobility and cargo of GMT-containing genomic islands in *Vibrio parahaemolyticus*.
Main Methods:
- Comparative genomics to identify and describe GMT-containing genetic elements.
- Functional characterization of GMT islands and their encoded systems in *Vibrio parahaemolyticus*.
- Phylogenetic analysis to understand the distribution and evolution of these elements.
Main Results:
- GMT-containing genomic islands are active mobile elements.
- These islands harbor anti-phage defense systems, type VI secretion system (T6SS) effectors, and antibiotic-resistance genes.
- Four novel anti-phage systems were identified within GMT islands, including GAPS1, which is activated by phage capsid proteins to induce bacterial dormancy.
Conclusions:
- GMT islands represent a significant reservoir of both offensive and defensive genetic tools for bacteria.
- The concept of 'defense islands' should be expanded to encompass mobile elements that disseminate both defensive and offensive capabilities.
- Understanding these mobile elements is crucial for comprehending bacterial adaptation and evolution in response to phage predation and environmental pressures.
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