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Originally published in Science Express on 8 June 2006
Science 14 July 2006:
Vol. 313. no. 5784, pp. 236 - 238
DOI: 10.1126/science.1128794
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Reports

Selective Silencing of Foreign DNA with Low GC Content by the H-NS Protein in Salmonella

William Wiley Navarre,1 Steffen Porwollik,4 Yipeng Wang,4 Michael McClelland,4 Henry Rosen,2 Stephen J. Libby,1* Ferric C. Fang1,2,3*{dagger}

Horizontal gene transfer plays a major role in microbial evolution. However, newly acquired sequences can decrease fitness unless integrated into preexisting regulatory networks. We found that the histone-like nucleoid structuring protein (H-NS) selectively silences horizontally acquired genes by targeting sequences with GC content lower than the resident genome. Mutations in hns are lethal in Salmonella unless accompanied by compensatory mutations in other regulatory loci. Thus, H-NS provides a previously unrecognized mechanism of bacterial defense against foreign DNA, enabling the acquisition of DNA from exogenous sources while avoiding detrimental consequences from unregulated expression of newly acquired genes. Characteristic GC/AT ratios of bacterial genomes may facilitate discrimination between a cell's own DNA and foreign DNA.

1 Department of Laboratory Medicine, University of Washington, Seattle, WA 98195, USA.
2 Department of Medicine, University of Washington, Seattle, WA 98195, USA.
3 Department of Microbiology, University of Washington, Seattle, WA 98195, USA.
4 Sidney Kimmel Cancer Center, San Diego, CA 92121, USA.

* These authors contributed equally to this work.

{dagger} To whom correspondence should be addressed. E-mail: fcfang{at}u.washington.edu

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