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Journal of Bacteriology, October 2001, p. 5782-5787, Vol. 183, No. 19
0021-9193/01/$04.00+0   DOI: 10.1128/JB.183.19.5782-5787.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Intervening Sequences in rrl Genes and Fragmentation of 23S rRNA in Genera of the Family Enterobacteriaceae

Loes M. Pronkdagger and Kenneth E. Sanderson*

Salmonella Genetic Stock Centre, Department of Biological Sciences, University of Calgary, Calgary, Alberta, Canada T2N 1N4

Received 31 July 2000/Accepted 27 June 2001

Intervening sequences (IVSs) in the rrl genes for 23S rRNA are transcribed but later removed by RNase III without religation during RNA processing, leading to fragmented rRNA. We examined about 240 strains of the family Enterobacteriaceae for presence of IVSs using PCR. No IVSs were detected in strains belonging to Escherichia, Shigella, Enterobacter, Erwinia, Ewingella, Hafnia, Kluyvera, Morganella, Pantoea, or Serratia. Previously unreported IVSs were detected in Klebsiella oxytoca, Citrobacter amalonaticus, and Providencia stuartii; previously reported IVSs are in species of Salmonella, Proteus, Providencia, and Yersinia. The sporadic distribution of IVSs indicates lateral genetic transfer of IVSs.


* Corresponding author. Mailing address: Salmonella Genetic Stock Centre, Department of Biological Sciences, University of Calgary, Calgary, Alberta, Canada T2N 1N4. Phone: (403) 220-6792 or (403) 220-3572. Fax: (403) 289-9311. E-mail: kesander{at}ucalgary.ca.

dagger Present address: Syngenta Seeds BV, afd. Seedtechnology, 1606 BK Enkhuizen, The Netherlands.


Journal of Bacteriology, October 2001, p. 5782-5787, Vol. 183, No. 19
0021-9193/01/$04.00+0   DOI: 10.1128/JB.183.19.5782-5787.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.



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