Abstract
Gene expression in Bacillus subtilis from late exponential to stationary phase was monitored by DNA microarrays with samples taken from the culture in LB broth with glucose supplement to prevent sporulation. Three major patterns of gene expression as revealed in this study were consistent to the expression profiling of PerR/Spx regulons and three major sigma factors—SigA, SigB, and SigW. Expression of most SigA-dependent house-keeping genes was significantly decreased and remained at low levels in the stationary phase. The sigB gene and additional genes of the SigB regulon for stress response exhibited a distinct pattern of transient induction with a peak in transition phase. The majority of induced genes after cessation of SigB-dependent surge were subjected to regulation by SigW, PerR, and Spx in response to oxidative stress. No induction of spo0A and skfA regulons supports the suppression of sporulation and cannibalism processes in the stationary phase by glucose supplement. In summary, these results depicted complicated strategies by cells to adapt changes from the fast growing exponential phase toward the stationary phase. The absence of programed cell death and sporulation greatly facilitated data analysis and the identification of distinct expression patterns in the stationary phase of growth in B. subtilis.
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Acknowledgments
This work was supported by a NIH research grant GM 34766. We thank Dr. Hsiuchin Yang for discussions and Sonja Young for the Microarray service in the GSU Biology Core Facility which is supported by the Georgia Research Alliance, Molecular Basis of Disease Program and Center for Biotechnology and Drug Design. CKY was the fellow of the Program in Molecular Basis of Diseases at Georgia State University.
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Yang, CK., Tai, P.C. & Lu, CD. Time-Related Transcriptome Analysis of B. subtilis 168 During Growth with Glucose. Curr Microbiol 68, 12–20 (2014). https://doi.org/10.1007/s00284-013-0432-4
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DOI: https://doi.org/10.1007/s00284-013-0432-4