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Substrate Generation for Endonucleases of CRISPR/Cas Systems
Published on: September 8, 2012
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Variability in the durability of CRISPR-Cas immunity
Hélène Chabas1, Antoine Nicot1, Sean Meaden2
11 CEFE UMR 5175, CNRS, Université de Montpellier, Université Paul-Valéry Montpellier, EPHE , 1919, Route de Mende, 34293 Montpellier Cedex 5, Paris , France.
Summary
Bacterial CRISPR-Cas immunity varies in durability against phages. Escape mutations often reduce phage fitness, but this cost doesn't predict resistance durability, impacting control strategies.
Area of Science:
- Microbial genetics and immunology
- Bacteriophage-bacteria coevolution
- Adaptive immune systems in prokaryotes
Background:
- Pathogen evolution challenges host resistance, necessitating understanding resistance durability for effective disease control.
- Clustered regularly interspaced short palindromic repeats-Cas (CRISPR-Cas) provides adaptive immunity in bacteria against phages.
Purpose of the Study:
- To investigate the durability of Streptococcus thermophilus CRISPR-Cas immunity against lytic phages.
- To explore the fitness costs of phage mutations that escape CRISPR-Cas targeting.
- To identify factors contributing to the variability in CRISPR-Cas mediated resistance durability.
Main Methods:
- Studied durability of different CRISPR-Cas alleles in Streptococcus thermophilus against phages.
- Analyzed fitness costs associated with phage escape mutations.
- Correlated fitness costs with the durability of CRISPR-Cas immunity.
Main Results:
- Substantial variability in resistance durability was observed among different CRISPR-Cas alleles.
- Phage escape mutations generally decreased phage fitness, but the magnitude of this cost did not predict resistance durability.
- Variability in durability may stem from phage mutation rates or the proportion of lethal mutations.
Conclusions:
- CRISPR-Cas immunity durability is variable and not solely dependent on the fitness cost of escape mutations.
- Phage mutation rate and the lethality of mutations are potential drivers of resistance durability.
- Findings have implications for coevolutionary dynamics, pathogen control strategies, and CRISPR-Cas based gene drives.
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