1887

Abstract

is a fastidious, Gram-negative bacterial pathogen of cats and humans. Previous workers have shown that serial passage leads to attenuation of virulence-associated attributes such as expression of pili, invasion of human epithelial cell lines and the stimulation of endothelial cell proliferation. In contrast to the published data, it was found that pilin expression is frequently preserved in organisms which have undergone phase variation . Transition from a slow-growing, dry agar-pitting (DAP) to a faster-growing, smooth non-agar-pitting (SNP) form appears to occur predictably and may reflect competition between two populations growing at different rates. Better survival of the slower-growing (DAP) form may explain its relatively easy retrieval from piliated SNP populations allowed to age on solid media. Pilin expression is associated with auto-agglutination in liquid suspension or broth cultures, and appears to be necessary but not sufficient for expression of the agar-pitting phenotype and for the formation of biofilms. Outer-membrane protein variation is seen in association with phase variation, but lipopolysaccharide expression is preserved in piliated as well as extensively passaged non-piliated isolates. The I/I infrequent restriction site-PCR fingerprint, which has been previously used to discriminate between serotypes Marseille and Houston, is shown to alter with phase variation , and there is evidence that genetic change accompanies these events. The extent of genetic and phenotypic variability of phase-variant has previously been underestimated. It may lead to new insights into the pathogenicity of this organism, and must be considered when interpreting data arising from such studies.

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2003-03-01
2024-10-11
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