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FEMS Microbiol Lett. 2002 Apr 23;210(1):73-80.

Identification of in vivo essential genes from Pseudomonas aeruginosa by PCR-based signature-tagged mutagenesis.

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Centre de Recherche sur la Fonction, Structure et Ingénierie des Protéines, Faculté de Médecine, et Pavillon Charles-Eugène Marchand, Université Laval, Ste-Foy, QC Canada G1K 7P4.


We adapted PCR-based signature-tagged mutagenesis (STM) to Pseudomonas aeruginosa. A collection of 1056 mutants was screened in a chronic lung infection rat model. Thirteen mutants were confirmed to be attenuated. Analysis revealed that these STM mutants represented transposon insertions into eight genes previously described in databases, three genes encoding proteins sharing identity with hypothetical proteins and two genes that shared no significant identity with sequences in databases. Five strains mutated in genes involved in protein degradation, stress tolerance, cation transport, ABC transporter, and an unknown protein were shown to be highly attenuated when tested individually in the rat chronic lung infection model.

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