title: Evaluation of differential gene expression in susceptible and resistant clinical isolates of Klebsiella pneumoniae by DNA microarray analysis.
abstract: DNA microarray technology was used to evaluate differential gene expression in a susceptible Klebsiella pneumoniae isolate and a resistant clinical derivative. Nineteen genes were up-regulated in the resistant isolate when compared with the susceptible isolate. An ABC transporter-related gene, ycjV, was strongly over-expressed, suggesting the existence of a novel active efflux mechanism. Approximately half of the up-regulated genes coded for ribosomal proteins, or proteins involved in tRNA metabolism. Among 33 downregulated genes, almost one-third were related to nitrogen metabolism. A possible role of fitness in the development of antimicrobial resistance is suggested.
authors.affiliation: Departamento de Biología and Institut Universitari d'Investigació en Ciències de la Salut, Universidad de las Islas Baleares, Palma de Mallorca, Spain.
authors.forename: A
authors.initials: A
authors.lastname: Doménech-Sánchez
authors.forename: V Javier
authors.initials: VJ
authors.lastname: Benedí
authors.forename: L
authors.initials: L
authors.lastname: Martínez-Martínez
authors.forename: S
authors.initials: S
authors.lastname: Albertí
mesh_terms: D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D001426:Bacterial Proteins / Q000235:genetics* / Q000378:metabolism; D024881:Drug Resistance, Bacterial; D020869:Gene Expression Profiling; D015964:Gene Expression Regulation, Bacterial; D006801:Humans; D007711:Klebsiella pneumoniae / Q000187:drug effects* / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism*; D008826:Microbial Sensitivity Tests; D020411:Oligonucleotide Array Sequence Analysis / Q000379:methods*; D014158:Transcription, Genetic
chemical_list: D000900:Anti-Bacterial Agents; D001426:Bacterial Proteins