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Published on: June 25, 2013
Mutagenic lesion bypass and two functionally different RecA proteins in Deinococcus deserti
Rémi Dulermo1, Sylvain Fochesato1, Laurence Blanchard1
1CEA, DSV, IBEB, Lab Ecol Microb Rhizosphere & Environ Extrem (LEMiRE), Saint-Paul-lez-Durance, F-13108, France.CNRS, UMR 6191 Biol Veget & Microbiol Environ, Saint-Paul-lez-Durance, F-13108, France.Aix-Marseille Université, Saint-Paul-lez-Durance, F-13108, France.
Deinococcus deserti utilizes multiple RecA proteins for DNA repair and survival after radiation. Specific RecA proteins and translesion synthesis polymerases enable UV mutagenesis and adaptation to extreme environments.
Area of Science:
- Microbiology
- Molecular Biology
- Genetics
Background:
- RecA protein is crucial for DNA repair and radiation tolerance in Deinococcus species.
- Deinococcus deserti possesses unique genetic features, including multiple recA genes and translesion synthesis (TLS) DNA polymerases.
Purpose of the Study:
- To characterize the roles of multiple recA genes and TLS polymerases (ImuY, DnaE2) in Deinococcus deserti.
- To understand the interplay between DNA repair, mutagenesis, and radiation tolerance in this extremophile.
Main Methods:
- Development of genetic tools for Deinococcus deserti.
- Construction and analysis of mutant strains lacking specific recA or TLS polymerase genes.
- Assessment of radiation survival and UV mutability.
Main Results:
- Both RecA(C) and RecA(P) proteins are functional, contributing to survival after high-dose radiation exposure.
- UV mutagenesis in D. deserti requires ImuY, DnaE2, and RecA(C), but not RecA(P).
- RecA(C) induces the expression of imuY and dnaE2 genes after UV exposure.
Conclusions:
- Multiple RecA proteins in D. deserti likely balance efficient error-free DNA repair with controlled error-prone translesion synthesis.
- This genetic system may enhance adaptation to harsh environmental conditions by generating variability while maintaining genome integrity.
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