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. 1983 Jul;155(1):74–81. doi: 10.1128/jb.155.1.74-81.1983

DNA sequence adjacent to flagellar genes and evolution of flagellar-phase variation.

E Szekely, M Simon
PMCID: PMC217654  PMID: 6305924

Abstract

A variety of factors, including phase variation, are involved in the regulation of flagellin gene expression in Salmonella sp. Flagellar-phase variation refers to the alternate expression of two different flagellin genes, H1 and H2. Site-specific inversion of a DNA segment adjacent to the H2 gene is responsible for switching expression. The segment includes the H2 promoter as well as the hin gene, which is required to mediate the inversion. Sequences in this region have homology with the corresponding sequences adjacent to the H1 flagellin gene in Salmonella sp. and the hag flagellin gene in Escherichia coli. The hin gene has also been shown to be homologous to the gin gene, which is found on bacteriophage Mu. To understand gene expression and the origin of these relationships, we have compared the DNA sequence adjacent to all three flagellin genes. The sequence data suggest a mechanism for the evolution of the hin-H2 locus.

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Selected References

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