Identification of New Genes Contributing to the Extreme Radioresistance of Deinococcus Radiodurans Using a Tn5-based Transposon Mutant Library

Overview

Journal PLoS One

Specialties General Medicine
Science

Date 2015 Apr 18

PMID 25884619

Citations 16

Authors

Remi Dulermo

Takefumi Onodera

Genevieve Coste

Fanny Passot

Murielle Dutertre

Martine Porteron

Fabrice Confalonieri

Suzanne Sommer

Cecile Pasternak

Affiliations

Soon will be listed here.

Abstract

Here, we have developed an extremely efficient in vivo Tn5-based mutagenesis procedure to construct a Deinococcus radiodurans insertion mutant library subsequently screened for sensitivity to genotoxic agents such as γ and UV radiations or mitomycin C. The genes inactivated in radiosensitive mutants belong to various functional categories, including DNA repair functions, stress responses, signal transduction, membrane transport, several metabolic pathways, and genes of unknown function. Interestingly, preliminary characterization of previously undescribed radiosensitive mutants suggests the contribution of cyclic di-AMP signaling in the recovery of D. radiodurans cells from genotoxic stresses, probably by modulating several pathways involved in the overall cell response. Our analyses also point out a new transcriptional regulator belonging to the GntR family, encoded by DR0265, and a predicted RNase belonging to the newly described Y family, both contributing to the extreme radioresistance of D. radiodurans. Altogether, this work has revealed new cell responses involved either directly or indirectly in repair of various cell damage and confirmed that D. radiodurans extreme radiation resistance is determined by a multiplicity of pathways acting as a complex network.

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