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Ecology and evolution of phages encoding anti-CRISPR proteins
Benoît J Pons1, Stineke van Houte1, Edze R Westra1
1ESI, Biosciences, University of Exeter, Cornwall Campus, Penryn, UK.
Journal of Molecular Biology
|January 23, 2023
Summary
Mobile genetic elements use anti-CRISPR (Acr) proteins to evade bacterial CRISPR-Cas defenses. This review explores Acr gene distribution, phage ecology, and coevolution with bacterial hosts.
Area of Science:
- Microbiology
- Molecular Biology
- Evolutionary Biology
Background:
- CRISPR-Cas systems are prokaryotic defenses against mobile genetic elements (MGE) like phages.
- Anti-CRISPR (Acr) proteins produced by MGE inhibit CRISPR-Cas systems, enabling MGE replication.
- Research has focused on Acr discovery, structure, function, and biotechnology, with limited ecological insights.
Purpose of the Study:
- To review the current understanding of anti-CRISPR (Acr) gene distribution in MGE.
- To explore the ecology of phages that encode Acr proteins.
- To examine the coevolutionary dynamics between Acr-encoding MGE and their bacterial hosts.
Main Methods:
- Literature review synthesizing existing research on Acr proteins and MGE.
- Analysis of data on Acr gene distribution across various MGE.
- Examination of ecological studies focusing on phage-host interactions involving Acr.
Main Results:
- Anti-CRISPR genes are found distributed within various mobile genetic elements.
- Phages encoding Acr proteins play a significant role in microbial ecosystems.
- Coevolutionary arms races exist between bacterial CRISPR-Cas defenses and phage Acr proteins.
Conclusions:
- Understanding Acr distribution and ecology is crucial for comprehending MGE-host interactions.
- Further research using diverse and complex experimental models is needed to fully elucidate Acr's impact.
- Anti-CRISPR proteins represent a key factor in the ongoing coevolutionary battle in microbial communities.
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