NHEJ protects mycobacteria in stationary phase against the harmful effects of desiccation

Pitcher, R. S., Green, A. J., Brzostek, A., Korycka-Machala, M., Dziadek, J. and Doherty, A. J. (2007) NHEJ protects mycobacteria in stationary phase against the harmful effects of desiccation. DNA Repair, 6 (9). pp. 1271-1276. ISSN 0144-8420

[img]
Preview
PDF
Download (6MB) | Preview

Abstract

The physiological role of the non-homologous end-joining (NHEJ) pathway in the repair of DNA double-strand breaks (DSBs) was examined in Mycobacterium smegmatis using DNA repair mutants (DeltarecA, Deltaku, DeltaligD, Deltaku/ligD, DeltarecA/ku/ligD). Wild-type and mutant strains were exposed to a range of doses of ionizing radiation at specific points in their life-cycle. NHEJ-mutant strains (Deltaku, DeltaligD, Deltaku/ligD) were significantly more sensitive to ionizing radiation (IR) during stationary phase than wild-type M. smegmatis. However, there was little difference in IR sensitivity between NHEJ-mutant and wild-type strains in logarithmic phase. Similarly, NHEJ-mutant strains were more sensitive to prolonged desiccation than wild-type M. smegmatis. A DeltarecA mutant strain was more sensitive to desiccation and IR during both stationary and especially in logarithmic phase, compared to wild-type strain, but it was significantly less sensitive to IR than the DeltarecA/ku/ligD triple mutant during stationary phase. These data suggest that NHEJ and homologous recombination are the preferred DSB repair pathways employed by M. smegmatis during stationary and logarithmic phases, respectively.

Item Type: Article
Keywords: DNA repair, NHEJ, Mycobacteria, Desiccation, Ku
Schools and Departments: School of Life Sciences
Subjects: Q Science > QM Human anatomy
Depositing User: Gee Wheatley
Date Deposited: 19 Feb 2008
Last Modified: 07 Mar 2017 04:39
URI: http://sro.sussex.ac.uk/id/eprint/1122
Google Scholar:30 Citations

View download statistics for this item

📧 Request an update