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Journal of Bacteriology, November 2004, p. 7521-7528, Vol. 186, No. 22
0021-9193/04/$08.00+0     DOI: 10.1128/JB.186.22.7521-7528.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

Sequence Organization and Insertion Specificity of the Novel Chimeric ISHp609 Transposable Element of Helicobacter pylori{dagger}

Dangeruta Kersulyte,1 Awdhesh Kalia,1 MaoJun Zhang,1 Hae-Kyung Lee,1,2 Dharmalingam Subramaniam,3 Levute Kiuduliene,4 Henrikas Chalkauskas,5 and Douglas E. Berg1,3*

Department of Molecular Microbiology,1 Department of Internal Medicine, Washington University School of Medicine, St. Louis, Missouri,3 Department of Clinical Pathology, St. Mary's Hospital, Catholic University Medical College, Uijungbu, Korea,2 Institute of Biotechnology,4 Clinic of Gastroenterology, Vilnius University Hospital, Vilnius, Lithuania5

Received 2 July 2004/ Accepted 29 July 2004

Here we describe ISHp609 of Helicobacter pylori, a new member of the IS605 mobile element family that is novel and contains two genes whose functions are unknown, jhp960 and jhp961, in addition to homologs of two other H. pylori insertion sequence (IS) element genes, orfA, which encodes a putative serine recombinase-transposase, and orfB, whose homologs in other species are also often annotated as genes that encode transposases. The complete four-gene element was found in 10 to 40% of strains obtained from Africa, India, Europe, and the Americas but in only 1% of East Asian strains. Sequence comparison of 10 representative ISHp609 elements revealed higher levels of DNA sequence matches (99%) than those seen in normal chromosomal genes (88 to 98%) or in other IS elements (95 to 97% for IS605, IS606, and IS607) from the same H. pylori populations. Sequence analysis suggested that ISHp609 can insert at many genomic sites with its left end preferentially next to TAT, with no target specificity for its right end, and without duplicating or deleting target sequences. A deleted form of ISHp609, containing just jhp960 and jhp961 and 37 bp of orfA, found in reference strain J99, was at the same chromosomal site in 15 to 40% of the strains from many geographic regions but again in only 1% of the East Asian strains. The abundance and sequence homogeneity of ISHp609 and of this nonmobile remnant suggested a recent bottleneck and then rapid spread in H. pylori populations, possibly selected by the contributions of the elements to bacterial fitness.

* Corresponding author. Mailing address: Box 8230, Department of Molecular Microbiology, 4940 Parkview Place, Washington University School of Medicine, St. Louis, MO 63110. Phone: (314) 362-2772. Fax: (314) 362-1232. E-mail: berg{at}borcim.wustl.edu.

{dagger} Supplemental material for this article may be found at http://jb.asm.org.

Journal of Bacteriology, November 2004, p. 7521-7528, Vol. 186, No. 22
0021-9193/04/$08.00+0     DOI: 10.1128/JB.186.22.7521-7528.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.



This article has been cited by other articles:

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  • Prosseda, G., Latella, M. C., Casalino, M., Nicoletti, M., Michienzi, S., Colonna, B. (2006). Plasticity of the Pjunc Promoter of ISEc11, a New Insertion Sequence of the IS1111 Family. J. Bacteriol. 188: 4681-4689 [Abstract] [Full Text]  


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