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| Status |
Public on Nov 25, 2009 |
| Title |
Comparative transcriptome and phenotype analysis of acid-stressed Bacillus cereus strain ATCC 14579 |
| Platform organism |
Bacillus cereus ATCC 14579 |
| Sample organism |
Bacillus cereus |
| Experiment type |
Expression profiling by array
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| Summary |
The food-borne human pathogen Bacillus cereus is found in environments that often have a low pH, such as food and soil. The physiological response upon exposure to several levels of acidity were investigated of B. cereus model strain ATCC 14579, to elucidate the response of B. cereus to acid stress. pH 5.4, pH 5.0, pH 4.8 and pH 4.5 were selected to conduct microarray analyses, based on the differences in physiological response upon exposure to the acid conditions. The transcriptome data revealed response specific profiles. Showing mechanisms induced upon all the different acid down-shocks, such as nitrate reductase and energy production genes, and several genes specifically expressed differentially in mild or lethal levels of acidity, such as F1F0-ATPase and cydAB. Furthermore, mechanisms involved in oxidative stress response were found highly up-regulated in response to both mild and lethal acid stress. The induction of oxidative stress related genes may be a response to the formation of reactive oxygen species by a perturbation of the electron transport chain. Therefore, the formation of hydroxyl radicals and/ or peroxynitrite was monitored upon exposure to the different levels of acidity with a fluorescent probe in a flow cytometer. The formation of these oxidative compounds was shown to be specific for lethal pHs and a model to relate radical formation with the observed transcriptome profiles was proposed.
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| Overall design |
Per acid down-shock three exposure times (i.e., 10, 30 and 60 min) were each compared with non-exposed cells (i.e., t0). In total 4 different acid down-shocks were applied, pH 5.4, pH 5.0, pH 4.8 and pH 4.5. The experiments were performed in duplicate and the duplicate samples were hybridised with a dye-swap.
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| Contributor(s) |
Mols M, van Kranenburg R, van Melis C, Moezelaar R, Abee T |
| Citation(s) |
20074238 |
| |
| Submission date |
Nov 22, 2008 |
| Last update date |
Mar 20, 2012 |
| Contact name |
Maarten Mols |
| Organization name |
Wageningen University
|
| Department |
ATV
|
| Lab |
Food Microbiology
|
| Street address |
Bomenweg 2
|
| City |
Wageningen |
| ZIP/Postal code |
6703 HD |
| Country |
Netherlands |
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| Platforms (1) |
| GPL7680 |
Bacillus cereus Bc14579 - 2nd design (2x11K) |
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| Samples (24)
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| This SubSeries is part of SuperSeries: |
| GSE13773 |
Comparative transcriptome and phenotype analysis of acid-stressed Bacillus cereus strains |
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| Relations |
| BioProject |
PRJNA114641 |
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