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CRISPR/Cas9-Mediated Phage Resistance Is Not Impeded by the DNA Modifications of Phage T4

Journal Article · · PLoS ONE
 [1];  [2];  [2]
  1. Harvard Medical School, Boston, MA (United States); Massachusetts Institute of Technology (MIT), Cambridge, MA (United States); Harvard Medical School, Boston, MA (United States)
  2. Harvard Medical School, Boston, MA (United States)
Bacteria rely on two known DNA-level defenses against their bacteriophage predators: restriction-modification and Clustered Regularly Interspaced Short Palindromic Repeats (CRISPR)-CRISPR-associated (Cas) systems. Certain phages have evolved countermeasures that are known to block endonucleases. For example, phage T4 not only adds hydroxymethyl groups to all of its cytosines, but also glucosylates them, a strategy that defeats almost all restriction enzymes. We sought to determine whether these DNA modifications can similarly impede CRISPR-based defenses. In a bioinformatics search, we found naturally occurring CRISPR spacers that potentially target phages known to modify their DNA. Experimentally, we show that the Cas9 nuclease from the Type II CRISPR system of Streptococcus pyogenes can overcome a variety of DNA modifications in Escherichia coli. The levels of Cas9-mediated phage resistance to bacteriophage T4 and the mutant phage T4 gt, which contains hydroxymethylated but not glucosylated cytosines, were comparable to phages with unmodified cytosines, T7 and the T4-like phage RB49. Our results demonstrate that Cas9 is not impeded by N6-methyladenine, 5-methylcytosine, 5-hydroxymethylated cytosine, or glucosylated 5-hydroxymethylated cytosine.
Research Organization:
Harvard Medical School, Boston, MA (United States); Harvard University, Cambridge, MA (United States)
Sponsoring Organization:
National Science Foundation; USDOE Office of Science (SC); Wyss Institute
Grant/Contract Number:
FG02-02ER63445
OSTI ID:
1904696
Journal Information:
PLoS ONE, Journal Name: PLoS ONE Journal Issue: 6 Vol. 9; ISSN 1932-6203
Publisher:
Public Library of ScienceCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (9)

Identification and biosynthesis of thymidine hypermodifications in the genomic DNA of widespread bacterial viruses journal March 2018
Keeping crispr in check: diverse mechanisms of phage-encoded anti-crisprs journal May 2019
The action ofEscherichia coliCRISPR–Cas system on lytic bacteriophages with different lifestyles and development strategies journal January 2017
Bacteriophage DNA glucosylation impairs target DNA binding by type I and II but not by type V CRISPR–Cas effector complexes journal December 2017
Complete Genome Sequences of T4-Like Bacteriophages RB3, RB5, RB6, RB7, RB9, RB10, RB27, RB33, RB55, RB59, and RB68 journal February 2015
Covalent Modification of Bacteriophage T4 DNA Inhibits CRISPR-Cas9 journal June 2015
Phenotypic and genomic analyses of bacteriophages targeting environmental and clinical CS3-expressing enterotoxigenic Escherichia coli (ETEC) strains journal December 2018
Risk Mitigation of Immunogenicity: A Key to Personalized Retinal Gene Therapy journal November 2021
Comparison of CRISPR and Marker-Based Methods for the Engineering of Phage T7 journal February 2020

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