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Abstract 


Previous studies of the phase 1 flagellar filament protein (flagellin) in strains of five serovars of Salmonella indicated that the central region of the fliC gene encoding the antigenic part of the protein is hypervariable both between and within serovars. To explore the possible use of this variation as a source of information on the phylogenetic relationships of closely related strains, we used the polymerase chain reaction technique to sequence part of the central region of the phase 1 flagellar genes of seven strains of Salmonella typhimurium that were known to differ in chromosomal genotype, as indexed by multilocus enzyme electrophoresis. We found that the nucleotide sequences of the central region were identical in all seven strains and determined that both the previously published sequence of the fliC gene in S. typhimurium LT2 and a report of a marked difference in the amino acid sequence of the phase 1 flagellins of two isolates of this serovar are erroneous. Our finding that the fliC gene is not evolving by sequence drift at an unusually rapid rate is compatible with a model that invokes lateral transfer and recombination of the flagellin genes as a major evolutionary process generating new serovars (antigen combinations) of salmonellae.

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J Bacteriol. 1990 Feb; 172(2): 603–609.
PMCID: PMC208483
PMID: 2404944

Sequence invariance of the antigen-coding central region of the phase 1 flagellar filament gene (fliC) among strains of Salmonella typhimurium.

Abstract

Previous studies of the phase 1 flagellar filament protein (flagellin) in strains of five serovars of Salmonella indicated that the central region of the fliC gene encoding the antigenic part of the protein is hypervariable both between and within serovars. To explore the possible use of this variation as a source of information on the phylogenetic relationships of closely related strains, we used the polymerase chain reaction technique to sequence part of the central region of the phase 1 flagellar genes of seven strains of Salmonella typhimurium that were known to differ in chromosomal genotype, as indexed by multilocus enzyme electrophoresis. We found that the nucleotide sequences of the central region were identical in all seven strains and determined that both the previously published sequence of the fliC gene in S. typhimurium LT2 and a report of a marked difference in the amino acid sequence of the phase 1 flagellins of two isolates of this serovar are erroneous. Our finding that the fliC gene is not evolving by sequence drift at an unusually rapid rate is compatible with a model that invokes lateral transfer and recombination of the flagellin genes as a major evolutionary process generating new serovars (antigen combinations) of salmonellae.

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NIAID NIH HHS (1)