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Journal of Clinical Microbiology, 05 1996, 1129-1135, Vol 34, No. 5
E Mahenthiralingam, ME Campbell, J Foster, JS Lam and DP Speert
Pseudomonas aeruginosa isolates recovered from chronically colonized
patients with cystic fibrosis (CF) are phenotypically different from those
collected from other patients or from the environment. To assess whether
alterations in motility, mucoidy, and serum susceptibility represented an
adaptation to chronic infection or replacement by a new strain, sequential
P. aeruginosa isolates of known phenotype collected from 20 CF patients
were typed by random amplified polymorphic DNA (RAPD) analysis. A total of
35 RAPD strain types were found among 385 isolates from 20 patients, and
only two patients had P. aeruginosa strains of the same RAPD fingerprint.
Eight strain pairs representative of the first eight RAPD types were also
analyzed by SpeI macrorestriction followed by pulsed-field gel
electrophoresis (PFGE); the strain types found by both fingerprinting
techniques correlated exactly. In 11 of 20 patients, the RAPD types of
serial P. aeruginosa isolates remained stable despite alterations in
isolate motility, colonial morphology, and lipopolysaccharide phenotype.
However, in isolates collected from one CF patient, a single band change in
RAPD fingerprint and CeuI PFGE profile correlated with the appearance of an
RpoN mutant phenotype, suggesting that the altered phenotype may have been
due to a stable genomic rearrangement. Secretion of mucoid
exopolysaccharide, loss of expression of RpoN-dependent surface factors,
and acquisition of a serum-susceptible phenotype in P. aeruginosa appear to
evolve during chronic colonization in CF patients from specific adaptation
to infection rather than from acquisition of new bacterial strains.
Copyright © 1996 by the American Society for Microbiology. All rights reserved.
Random amplified polymorphic DNA typing of Pseudomonas aeruginosa isolates recovered from patients with cystic fibrosis
Canadian Bacterial Diseases Network, Vancouver, Canada.
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