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Journal of Bacteriology, June 2008, p. 4075-4078, Vol. 190, No. 11
0021-9193/08/$08.00+0     doi:10.1128/JB.00220-08
Copyright © 2008, American Society for Microbiology. All Rights Reserved.

Insertion Hot Spot for Horizontally Acquired DNA within a Bidirectional Small-RNA Locus in Salmonella enterica

Centre de Génétique Moléculaire, CNRS, 91198 Gif-sur-Yvette, France,¹ Departamento de Genética, Facultad de Biología, Universidad de Sevilla, 41080 Sevilla, Spain²

Received 12 February 2008/ Accepted 21 March 2008

In Escherichia coli and Salmonella enterica, RyeA and RyeB RNAs are encoded on opposite DNA strands at the same locus. We present evidence indicating that the last 23 bp of the ryeB gene, corresponding to an internal portion of the ryeA gene, served repeatedly as the integration site for exogenous DNA during Salmonella evolution and still act as an attachment site for present-day bacteriophages. Interestingly, ryeA sequence and expression are modified upon lysogenization.

Published ahead of print on 4 April 2008.