Sulfamethoxazole - Trimethoprim represses csgD but maintains virulence genes at 30°C in a clinical Escherichia coli O157:H7 isolate.
The high frequency of prophage insertions in the mlrA gene of clinical serotype O157:H7 isolates renders such strains deficient in csgD-dependent biofilm formation but prophage induction may restore certain mlrA properties. In this study we used transcriptomics to study the effect of high and low su...
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| Format: | Article |
| Language: | English |
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Public Library of Science (PLoS)
2018-01-01
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| Series: | PLoS ONE |
| Online Access: | http://europepmc.org/articles/PMC5931665?pdf=render |
| _version_ | 1819268061359767552 |
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| author | Gaylen A Uhlich Elisa Andreozzi Bryan J Cottrell Erin R Reichenberger Xinmin Zhang George C Paoli |
| author_facet | Gaylen A Uhlich Elisa Andreozzi Bryan J Cottrell Erin R Reichenberger Xinmin Zhang George C Paoli |
| author_sort | Gaylen A Uhlich |
| collection | DOAJ |
| description | The high frequency of prophage insertions in the mlrA gene of clinical serotype O157:H7 isolates renders such strains deficient in csgD-dependent biofilm formation but prophage induction may restore certain mlrA properties. In this study we used transcriptomics to study the effect of high and low sulfamethoxazole-trimethoprim (SMX-TM) concentrations on prophage induction, biofilm regulation, and virulence gene expression in strain PA20 under environmental conditions following 5-hour and 12-hour exposures in broth or on agar. SMX-TM at a sub-lethal concentration induced strong RecA expression resulting in concentration- and time-dependent major transcriptional shifts with emphasis on up-regulation of genes within horizontally-transferred chromosomal regions (HTR). Neither high or low levels of SMX-TM stimulated csgD expression at either time point, but both levels resulted in slight repression. Full expression of Ler-dependent genes paralleled expression of group 1 pch homologues in the presence of high glrA. Finally, stx2 expression, which is strongly dependent on prophage induction, was enhanced at 12 hours but repressed at five hours, in spite of early SOS initiation by the high SMX-TM concentration. Our findings indicate that, similar to host conditions, exposure to environmental conditions increased the expression of virulence genes in a clinical isolate but genes involved in the protective biofilm response were repressed. |
| first_indexed | 2024-12-23T21:27:04Z |
| format | Article |
| id | doaj.art-c623de11110746db94686ec7983e61a0 |
| institution | Directory Open Access Journal |
| issn | 1932-6203 |
| language | English |
| last_indexed | 2024-12-23T21:27:04Z |
| publishDate | 2018-01-01 |
| publisher | Public Library of Science (PLoS) |
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| series | PLoS ONE |
| spelling | doaj.art-c623de11110746db94686ec7983e61a02022-12-21T17:30:35ZengPublic Library of Science (PLoS)PLoS ONE1932-62032018-01-01135e019627110.1371/journal.pone.0196271Sulfamethoxazole - Trimethoprim represses csgD but maintains virulence genes at 30°C in a clinical Escherichia coli O157:H7 isolate.Gaylen A UhlichElisa AndreozziBryan J CottrellErin R ReichenbergerXinmin ZhangGeorge C PaoliThe high frequency of prophage insertions in the mlrA gene of clinical serotype O157:H7 isolates renders such strains deficient in csgD-dependent biofilm formation but prophage induction may restore certain mlrA properties. In this study we used transcriptomics to study the effect of high and low sulfamethoxazole-trimethoprim (SMX-TM) concentrations on prophage induction, biofilm regulation, and virulence gene expression in strain PA20 under environmental conditions following 5-hour and 12-hour exposures in broth or on agar. SMX-TM at a sub-lethal concentration induced strong RecA expression resulting in concentration- and time-dependent major transcriptional shifts with emphasis on up-regulation of genes within horizontally-transferred chromosomal regions (HTR). Neither high or low levels of SMX-TM stimulated csgD expression at either time point, but both levels resulted in slight repression. Full expression of Ler-dependent genes paralleled expression of group 1 pch homologues in the presence of high glrA. Finally, stx2 expression, which is strongly dependent on prophage induction, was enhanced at 12 hours but repressed at five hours, in spite of early SOS initiation by the high SMX-TM concentration. Our findings indicate that, similar to host conditions, exposure to environmental conditions increased the expression of virulence genes in a clinical isolate but genes involved in the protective biofilm response were repressed.http://europepmc.org/articles/PMC5931665?pdf=render |
| spellingShingle | Gaylen A Uhlich Elisa Andreozzi Bryan J Cottrell Erin R Reichenberger Xinmin Zhang George C Paoli Sulfamethoxazole - Trimethoprim represses csgD but maintains virulence genes at 30°C in a clinical Escherichia coli O157:H7 isolate. PLoS ONE |
| title | Sulfamethoxazole - Trimethoprim represses csgD but maintains virulence genes at 30°C in a clinical Escherichia coli O157:H7 isolate. |
| title_full | Sulfamethoxazole - Trimethoprim represses csgD but maintains virulence genes at 30°C in a clinical Escherichia coli O157:H7 isolate. |
| title_fullStr | Sulfamethoxazole - Trimethoprim represses csgD but maintains virulence genes at 30°C in a clinical Escherichia coli O157:H7 isolate. |
| title_full_unstemmed | Sulfamethoxazole - Trimethoprim represses csgD but maintains virulence genes at 30°C in a clinical Escherichia coli O157:H7 isolate. |
| title_short | Sulfamethoxazole - Trimethoprim represses csgD but maintains virulence genes at 30°C in a clinical Escherichia coli O157:H7 isolate. |
| title_sort | sulfamethoxazole trimethoprim represses csgd but maintains virulence genes at 30°c in a clinical escherichia coli o157 h7 isolate |
| url | http://europepmc.org/articles/PMC5931665?pdf=render |
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