Extensive DNA inversions in the B. fragilis genome control variable gene expression

Cerdeño-Tárraga, Ana M., Patrick, Sheila, Crossman, Lisa C., Blakely, Garry, Abratt, Val, Lennard, Nicola, Poxton, Ian, Duerden, Brian, Harris, Barbara, Quail, Mike A., Barron, Andrew, Clark, Louise, Corton, Craig, Doggett, Jonathan, Holden, Matthew T.G., Larke, Natasha, Line, Alexandra, Lord, Angela, Norbertczak, Halina, Ormond, Doug, Price, Claire, Rabbinowitsch, Ester, Woodward, John, Barrell, Bart and Parkhill, Julian (2005) Extensive DNA inversions in the B. fragilis genome control variable gene expression. Science, 307 (5714). pp. 1463-1465. ISSN 0036-8075

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The obligately anaerobic bacterium Bacteroides fragilis, an opportunistic pathogen and inhabitant of the normal human colonic microbiota, exhibits considerable within-strain phase and antigenic variation of surface components. The complete genome sequence has revealed an unusual breadth (in number and in effect) of DNA inversion events that potentially control expression of many different components, including surface and secreted components, regulatory molecules, and restriction-modification proteins. Invertible promoters of two different types (12 group 1 and 11 group 2) were identified. One group has inversion crossover (fix) sites similar to the hix sites of Salmonella typhimurium. There are also four independent intergenic shufflons that potentially alter the expression and function of varied genes. The composition of the 10 different polysaccharide biosynthesis gene dusters identified (7 with associated invertible promoters) suggests a mechanism of synthesis similar to the O-antigen capsules of Escherichia coli.

Item Type: Article
Uncontrolled Keywords: general ,/dk/atira/pure/subjectarea/asjc/1000
Faculty \ School: Faculty of Science > School of Biological Sciences
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Depositing User: LivePure Connector
Date Deposited: 14 May 2024 10:32
Last Modified: 14 May 2024 10:32
URI: https://ueaeprints.uea.ac.uk/id/eprint/95166
DOI: 10.1126/science.1107008

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