Role of Base Excision Repair in Listeria monocytogenes DNA Stress Survival During Infections

Juan Zhang, Shuyi Wang, Tjakko Abee, Stijn Van Der Veen*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

Background
Base excision repair (BER), consisting mostly of lesion-specific DNA glycosylases and apurinic/apyrimidinic (AP) endonucleases, is one of the most important DNA repair mechanisms for repair of single nucleobase lesions generated by reactive oxygen and nitrogen species as part of an immune response against bacterial infections. However, few studies have addressed the contribution of BER to bacterial virulence and Listeria monocytogenes BER has thus far remained completely uncharacterized.

Methods
Analysis of the L. monocytogenes EGDe genome identified 7 DNA glycosylases (MutM, MutY, Nth, Tag, Mpg, Ung, and Ung2) and 2 apurinic/apyrimidinic endonucleases (Xth and Nfo) as part of BER. Markerless in-frame deletion mutants were generated for all 9 genes, and mutants were tested for DNA damage survival, mutagenesis, and the ability to colonize a mouse model of infection.

Results
Distinct lesion-specific phenotypes were identified for all deletion mutants. Importantly, the Δnth, ΔmutY, and Δnfo mutants were significantly attenuated for virulence in the mouse model and showed much lower colonization of the liver and spleen or were unable to compete with the wild-type strain during in vivo competition assays.

Conclusions
Our results highlight the importance of BER for L. monocytogenes virulence and survival of DNA-damaging insults during host colonization.
Original languageEnglish
Article numberjiaa412
JournalThe Journal of Infectious Diseases
Volume223
Issue number4
Early online date9 Jul 2020
DOIs
Publication statusPublished - 15 Feb 2021

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