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. 1990 Nov;58(11):3633–3639. doi: 10.1128/iai.58.11.3633-3639.1990

High-frequency spontaneous mutation of classical Vibrio cholerae to a nonmotile phenotype.

P Mostow 1, K Richardson 1
PMCID: PMC313708  PMID: 2228234

Abstract

The species Vibrio cholerae contains within it two biotypes, classical and El Tor, both of which are motile. Phenotypic expression of motility was unaffected by type of growth medium, salt concentration, pH, or temperature of incubation. However, seven strains of classical V. cholerae produced spontaneous nonmotile mutants at an unusually high frequency (ca. 10(-4)), while no mutants were detected for all three El Tor strains examined. No revertants of these nonmotile mutants were detected. Four independent mutants of classical strain 395 were isolated to characterize this phenomenon. By transmission electron microscopy, one of the nonmotile mutants was found to be flagellated, while the other three were found to be aflagellate. Chromosomal DNA from the mutants and parental wild-type strain 395 was examined by Southern blot analysis with, as probes, V. cholerae mutagenic prophages VcA-1 and VcA-2 and six cloned motility gene regions isolated from transposon insertion motility mutants of strains 395 and N16961 (El Tor, Inaba). The parental wild-type strain and all of the mutants exhibited the same pattern of bands when probed with VcA-1 and VcA-2 DNAs. Four of the cloned motility gene regions hybridized to the same fragments of DNA in both the wild-type and mutant isolates. However, two other probes detected a new fragment for a single aflagellate mutant. The observations that spontaneous nonmotile mutants occurred at a high frequency and that these mutants did not revert at a detectable frequency suggested that a genetic event is involved. The phenomenon appears to be limited to classical V. cholerae and may explain why classical V. cholerae is only sporadically associated with disease in the current pandemic.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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