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The nucleotide excision repair (NER) system of Helicobacter pylori : role in mutation prevention and chromosomal import patterns after natural transformation
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Moccia, Claudia, Krebes, Juliane, Kulick, Stefan, Didelot, Xavier, Kraft, Christian, Bahlawane, Christelle and Suerbaum, Sebastian (2012) The nucleotide excision repair (NER) system of Helicobacter pylori : role in mutation prevention and chromosomal import patterns after natural transformation. BMC Microbiology, 12 (1). 67. doi:10.1186/1471-2180-12-67 ISSN 1471-2180.
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Official URL: http://dx.doi.org/10.1186/1471-2180-12-67
Abstract
Background
Extensive genetic diversity and rapid allelic diversification are characteristics of the human gastric pathogen Helicobacter pylori, and are believed to contribute to its ability to cause chronic infections. Both a high mutation rate and frequent imports of short fragments of exogenous DNA during mixed infections play important roles in generating this allelic diversity. In this study, we used a genetic approach to investigate the roles of nucleotide excision repair (NER) pathway components in H. pylori mutation and recombination.
Results
Inactivation of any of the four uvr genes strongly increased the susceptibility of H. pylori to DNA damage by ultraviolet light. Inactivation of uvrA and uvrB significantly decreased mutation frequencies whereas only the uvrA deficient mutant exhibited a significant decrease of the recombination frequency after natural transformation. A uvrC mutant did not show significant changes in mutation or recombination rates; however, inactivation of uvrC promoted the incorporation of significantly longer fragments of donor DNA (2.2-fold increase) into the recipient chromosome. A deletion of uvrD induced a hyper-recombinational phenotype.
Conclusions
Our data suggest that the NER system has multiple functions in the genetic diversification of H. pylori, by contributing to its high mutation rate, and by controlling the incorporation of imported DNA fragments after natural transformation.
Item Type: | Journal Article | ||||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Life Sciences (2010- ) | ||||||
Journal or Publication Title: | BMC Microbiology | ||||||
Publisher: | BioMed Central Ltd. | ||||||
ISSN: | 1471-2180 | ||||||
Official Date: | 6 May 2012 | ||||||
Dates: |
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Volume: | 12 | ||||||
Number: | 1 | ||||||
Article Number: | 67 | ||||||
DOI: | 10.1186/1471-2180-12-67 | ||||||
Status: | Peer Reviewed | ||||||
Publication Status: | Published | ||||||
Access rights to Published version: | Open Access (Creative Commons) |
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