PMID:21630090

Citation	Adnan, M, Morton, G and Hadi, S (2011) Analysis of rpoS and bolA gene expression under various stress-induced environments in planktonic and biofilm phase using 2(-ΔΔCT) method.Mol. Cell. Biochem. 357:275-82
Abstract	Genetic adaptation is one of the key features of Escherichia coli (E. coli) that ensure its survival in different hostile environments. E. coli seems to initiate biofilm development in response to specific environmental cues. A number of properties inherent within bacterial biofilms indicate that their gene expression is different from that of planktonic bacteria. Two of the possible important genes are rpoS and bolA. The rpoS gene has been known as the alternative sigma (σ) factor, which controls the expression of a large number of genes, which are involved in responses to a varied number of stresses, as well as transition to stationary phase from exponential form of growth. Morphogene bolA response to stress environment leads to round morphology of E. coli cells, but little is known about its involvement in biofilms and its development or maintenance. The purpose of this study was to understand and analyse the responses of rpoS and bolA gene to sudden change in the environment. In this study, E. coli K-12 MG1655, rpoS, and bolA mutant strains were used and gene expression was studied. Results show that both genes contribute to the ability to respond and adapt in response to various types of stresses. RpoS response to various stress environments was somehow constant in both the planktonic and biofilm phases, whereas bolA responded well under various stress conditions, in both planktonic and biofilm mode, up to 5-6-fold change in the expression was noticed in the case of pH variation and hydrogen peroxide stress (H(2)O(2)) as compared with rpoS.
Links	PubMed Online version:10.1007/s11010-011-0898-y
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Phenotype of	Taxon Information	Genotype Information (if known)	Condition Information	OMP ID	OMP Term Name	ECO ID	ECO Term Name	Notes	Status
a single strain under different conditions	Taxon: Escherichia coli Strain: K-12 Substrain: NCBI Taxon ID: 83333	Genotype of Reference Strain: bolA Genotype of Experimental Strain : bolA+	Reference Condition:	OMP:0000267	increased gene expression			5-6 fold increase in expression under oxidative stress in the planktonic phase when compared with rpoS expression, fig 7.
a mutation or genetic difference within a strain	Taxon: Escherichia coli Strain: K-12 Substrain: NCBI Taxon ID: 83333	Genotype of Reference Strain: bolA Genotype of Experimental Strain : bolA+	Reference Condition:	OMP:0000267	increased gene expression			2.2-fold incrase in the expression of bolA were seen after heat stress under biofilm and planktonic stages of growth, fig 7.
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