A role for the bacterial GATC methylome in antibiotic stress survival.

Abstract:

:Antibiotic resistance is an increasingly serious public health threat. Understanding pathways allowing bacteria to survive antibiotic stress may unveil new therapeutic targets. We explore the role of the bacterial epigenome in antibiotic stress survival using classical genetic tools and single-molecule real-time sequencing to characterize genomic methylation kinetics. We find that Escherichia coli survival under antibiotic pressure is severely compromised without adenine methylation at GATC sites. Although the adenine methylome remains stable during drug stress, without GATC methylation, methyl-dependent mismatch repair (MMR) is deleterious and, fueled by the drug-induced error-prone polymerase Pol IV, overwhelms cells with toxic DNA breaks. In multiple E. coli strains, including pathogenic and drug-resistant clinical isolates, DNA adenine methyltransferase deficiency potentiates antibiotics from the β-lactam and quinolone classes. This work indicates that the GATC methylome provides structural support for bacterial survival during antibiotic stress and suggests targeting bacterial DNA methylation as a viable approach to enhancing antibiotic activity.

journal_name

Nat Genet

journal_title

Nature genetics

authors

Cohen NR,Ross CA,Jain S,Shapiro RS,Gutierrez A,Belenky P,Li H,Collins JJ

doi

10.1038/ng.3530

subject

Has Abstract

pub_date

2016-05-01 00:00:00

pages

581-6

issue

5

eissn

1061-4036

issn

1546-1718

pii

ng.3530

journal_volume

48

pub_type

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