| Induction of rapid detachment in Shewanella oneidensis MR-1 biofilms. | |
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MedLine Citation:
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PMID: 15659679 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Active detachment of cells from microbial biofilms is a critical yet poorly understood step in biofilm development. We discovered that detachment of cells from biofilms of Shewanella oneidensis MR-1 can be induced by arresting the medium flow in a hydrodynamic biofilm system. Induction of detachment was rapid, and substantial biofilm dispersal started as soon as 5 min after the stop of flow. We developed a confocal laser scanning microscopy-based assay to quantify detachment. The extent of biomass loss was found to be dependent on the time interval of flow stop and on the thickness of the biofilm. Up to 80% of the biomass of 16-h-old biofilms could be induced to detach. High-resolution microscopy studies revealed that detachment was associated with an overall loosening of the biofilm structure and a release of individual cells or small cell clusters. Swimming motility was not required for detachment. Although the loosening of cells from the biofilm structure was observed evenly throughout thin biofilms, the most pronounced detachment in thicker biofilms occurred in regions exposed to the flow of medium, suggesting a metabolic control of detachability. Deconvolution of the factors associated with the stop of medium flow revealed that a sudden decrease in oxygen tension is the predominant trigger for initiating detachment of individual cells. In contrast, carbon limitation did not trigger any substantial detachment, suggesting a physiological link between oxygen sensing or metabolism and detachment. In-frame deletions were introduced into genes encoding the known and putative global transcriptional regulators ArcA, CRP, and EtrA (FNR), which respond to changes in oxygen tension in S. oneidensis MR-1. Biofilms of null mutants in arcA and crp were severely impacted in the stop-of-flow-induced detachment response, suggesting a role for these genes in regulation of detachment. In contrast, an DeltaetrA mutant displayed a variable detachment phenotype. From this genetic evidence we conclude that detachment is a biologically controlled process and that a rapid change in oxygen concentration is a critical factor in detachment and, consequently, in dispersal of S. oneidensis cells from biofilms. Similar mechanisms might also operate in other bacteria. |
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Authors:
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Kai M Thormann; Renée M Saville; Soni Shukla; Alfred M Spormann |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Journal of bacteriology Volume: 187 ISSN: 0021-9193 ISO Abbreviation: J. Bacteriol. Publication Date: 2005 Feb |
Date Detail:
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Created Date: 2005-01-20 Completed Date: 2005-03-01 Revised Date: 2013-04-18 |
Medline Journal Info:
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Nlm Unique ID: 2985120R Medline TA: J Bacteriol Country: United States |
Other Details:
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Languages: eng Pagination: 1014-21 Citation Subset: IM |
Affiliation:
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Department of Civil and Environmental Engineering, James H. Clark Center, E250, Stanford University, Stanford, CA 94305-5429, USA. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Base Sequence Biofilms* Cell Adhesion DNA Primers Genotype Kinetics Plasmids / genetics Shewanella / genetics, growth & development, physiology* |
| Chemical | |
Reg. No./Substance:
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0/DNA Primers |
| Comments/Corrections | |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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