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Transcriptome analysis of Bacillus cereus B3711 during silver ion stress condition

ABSTRACT: We have employed a whole genome microarray for gene expression profilling to understand the global view of the cellular mechanism and metabolic response of B. cereus B3711 exposed to 1 mM silver nitrate. RNA was extracted from B. cereus grown under silver treated and untreated set of conditions in duplicates at two different time points (30 & 60 min). Comparing the transcript profile of the control and treated cells, several differentially expressed genes were identified. These includes genes involved in various metabolic pathways, such as arginine and alanine metabolism, membrane transport system and alternate respiratory proteins such as arsenate reductase, stress related proteins, proteins of transcriptional regulators, hypothetical proteins and protein of two-component systems.

ORGANISM(S): Bacillus cereus

PROVIDER: GSE26043 | GEO | 2010/12/14

SECONDARY ACCESSION(S): PRJNA135537

REPOSITORIES: GEO

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Project description:A comparative transcriptome approach was used to assess genes involved in metabolism and pathogenesis that are specifically activated during anaerobic growth of the spore-forming food-borne human pathogen Bacillus cereus ATCC 14579. Growth under anaerobic conditions in Brain Heart Infusion broth revealed a reduced growth rate and a lower yield as compared to that under aerobic conditions. Comparative transcriptome analysis of cells harvested at early- and mid-exponential growth phase, transition phase and stationary phase, subsequently showed hundreds of genes to be induced under anaerobic condition. These included novel genes identified for anaerobic growth of B. cereus, encoding metabolic pathways, such as the arginine deiminase pathway (ArcABDC), a formate dehydrogenase (FdhF) and a pyruvate fomate lyase (Pfl), and alternative respiratory proteins, such as arsenate reductases. Furthermore, the nitrosative stress response was induced in the anaerobic transition phase of growth, conceivably due to the production of nitric oxide as a by-product of nitrite and nitrate respiration. Notably, both hemolytic enzyme and enterotoxin encoding genes were activated in different oxygen limiting conditions, i.e. hemolytic enzyme encoding genes were induced during anaerobic growth, whereas enterotoxin encoding genes were induced in the transition and stationary phase of aerobic cultures reaching a high cell density. These data point to metabolic rearrangements, stress adaptation and activation of the virulent status of B. cereus under anaerobic conditions, such as encountered in the human GI-tract. B. cereus ATCC 14579 was grown in BHI in 50 ml. Aerobic in a Erlenmeyer flask, shaking at 200 rpm. Anaerobic in a closed flask, flushed with Nitrogen-gas for 30 min, also shaking at 200 rpm. Transcriptome analyses Phase compared to mid-exponential phase Anaerobic (OD600) 0.2 compared to 0.4 Early-exponential 1.0 compared to 0.4 Transition 1.1 compared to 0.4 Stationary Aerobic (OD600) 0.2 compared to 0.8 Early-exponential 4.0 compared to 0.8 Transition 8.0 compared to 0.8 Stationary Aerobic to anaerobic (OD600) Anaerobic 0.6 to aerobic 0.6

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Transcriptome analysis of Bacillus cereus B3711 during silver ion stress condition

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