BACKGROUND: Helicobacter pylori persists in the human stomach for decades. This requires an efficient adaptation of H. pylori to the gastric niche and involves the regulation of bacterial genes in response to environmental stress. Efficient molecular tools to identify regulated H. pylori genes are scarce, therefore we developed a genomic lacZ reporter gene fusion system in H. pylori to screen for stress-regulated genes. MATERIALS AND METHODS: The integration vector pBW was constructed and used to generate random genomic lacZ fusions in H. pylori. Two-hundred-and-fifty H. pylori transformants were selected from this library, replica-plated and screened for differential lacZ expression after exposure to two environmental stress conditions: increased temperature (42 degrees C), and iron-limitation. RESULTS: From a library of H. pylori transformants with random genomic transcriptional lacZ fusions, two stress-regulated H. pylori loci were identified. The transcription of a gene of unknown function (designated hsp12) was increased by incubation at 42 degrees C. The transcription of a locus, consisting of the three fumarate reductase subunit genes (frdCAB) and the HP0190 gene from H. pylori strain 26695, was decreased under iron-limitation. CONCLUSIONS: This is the first time that a genomic transcriptional lacZ reporter gene H. pylori library has been used as a tool for the fast and efficient identification of environmental stress-regulated H. pylori genes.
BACKGROUND:Helicobacter pylori persists in the human stomach for decades. This requires an efficient adaptation of H. pylori to the gastric niche and involves the regulation of bacterial genes in response to environmental stress. Efficient molecular tools to identify regulated H. pylori genes are scarce, therefore we developed a genomic lacZ reporter gene fusion system in H. pylori to screen for stress-regulated genes. MATERIALS AND METHODS: The integration vector pBW was constructed and used to generate random genomic lacZ fusions in H. pylori. Two-hundred-and-fifty H. pylori transformants were selected from this library, replica-plated and screened for differential lacZ expression after exposure to two environmental stress conditions: increased temperature (42 degrees C), and iron-limitation. RESULTS: From a library of H. pylori transformants with random genomic transcriptional lacZ fusions, two stress-regulated H. pylori loci were identified. The transcription of a gene of unknown function (designated hsp12) was increased by incubation at 42 degrees C. The transcription of a locus, consisting of the three fumarate reductase subunit genes (frdCAB) and the HP0190 gene from H. pylori strain 26695, was decreased under iron-limitation. CONCLUSIONS: This is the first time that a genomic transcriptional lacZ reporter gene H. pylori library has been used as a tool for the fast and efficient identification of environmental stress-regulated H. pylori genes.
Authors: Nicolette de Vries; Dirk Duinsbergen; Ernst J Kuipers; Raymond G J Pot; Patricia Wiesenekker; Charles W Penn; Arnoud H M van Vliet; Christina M J E Vandenbroucke-Grauls; Johannes G Kusters Journal: J Bacteriol Date: 2002-12 Impact factor: 3.490
Authors: Arnoud H M van Vliet; Sophie W Poppelaars; Beverly J Davies; Jeroen Stoof; Stefan Bereswill; Manfred Kist; Charles W Penn; Ernst J Kuipers; Johannes G Kusters Journal: Infect Immun Date: 2002-06 Impact factor: 3.441
Authors: Beth M Carpenter; Timothy K McDaniel; Jeannette M Whitmire; Hanan Gancz; Silvia Guidotti; Stefano Censini; D Scott Merrell Journal: Appl Environ Microbiol Date: 2007-10-05 Impact factor: 4.792
Authors: D Scott Merrell; Lucinda J Thompson; Charles C Kim; Hazel Mitchell; Lucy S Tompkins; Adrian Lee; Stanley Falkow Journal: Infect Immun Date: 2003-11 Impact factor: 3.441
Authors: Anna Åberg; Pär Gideonsson; Anna Vallström; Annelie Olofsson; Carina Öhman; Lena Rakhimova; Thomas Borén; Lars Engstrand; Kristoffer Brännström; Anna Arnqvist Journal: PLoS Pathog Date: 2014-07-03 Impact factor: 6.823