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. 1995 Sep;177(17):5099–5107. doi: 10.1128/jb.177.17.5099-5107.1995

Genomic cleavage map of Salmonella typhi Ty2.

S L Liu 1, K E Sanderson 1
PMCID: PMC177289  PMID: 7665489

Abstract

The genomic cleavage map of Salmonella typhi Ty2, 4,780 kb in size, was determined through digestion of the genomic DNA with endonucleases and separation of the fragments by pulsed-field gel electrophoresis. The chromosome has 33, 26, 7, and 35 sites for the enzymes XbaI, BlnI, I-CeuI, and SpeI, respectively. The fragments were arranged around the chromosome through excision of fragments from the gel, redigestion with a second enzyme, and labelling with 32P, and reelectrophoresis and named in alphabetical order. Tn10 transposons inserted in 82 different genes of Salmonella typhimurium were transduced by phage P22 into S. typhi, and the location of Tn10, and thus of the gene, was mapped through the XbaI and BlnI sites of Tn10. All seven I-CeuI sites (in rrl genes for 23S rRNA) were conserved, and the gene order within the I-CeuI fragments resembles that of S. typhimurium LT2, but the order of I-CeuI fragments is rearranged from ABCDEFG in S. typhimurium LT2 to AGCEFDB in S. typhi. In addition, there is a 500-kb inversion which covers the terminus region. Comparisons of lengths of segments between genes showed that S. typhi has segments which differ in size from those in S. typhimurium. The viaB locus, for synthesis of the Vi antigen of S. typhi, was shown to be within a 118-kb loop (a segment of DNA with no homolog in most other Salmonella species) between mel and poxA on the chromosome.

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Selected References

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