Genotyping of different Pseudomonas aeruginosa morphotypes arising from the lower respiratory tract of a patient taken to an Intensive Care Unit

L. Putignani, R. Sessa, A. Petrucca, C. Manfredini, L. Coltella, D. Menichella, Mauro Nicoletti, C. Russo, P. Cipriani

Research output: Contribution to journalArticlepeer-review

Abstract

Pseudomonas aeruginosa is an opportunistic pathogen and an ubiquitous environmental bacterium. Fifty-seven days after hospitalization, we isolated three distinct P. aeruginosa morphotypes (smooth, rough and mucoid) from the lower respiratory tract of a patient admitted to a Cardiology Intensive Care Unit (ICU). Moreover, a group of nine colony variants, arising from the three P. aeruginosa isolates growing in laboratory growth media, were also isolated. The resulting 12 isolates were characterised for antibiotic resistance profile and subjected to genotypic analysis by fluorescent-Amplified Fragment Length Polymorphism (f-AFLP) and automated repetitive extragenic palindromic-PCR (rep-PCR) fingerprinting. The three smooth, rough and mucoid morphotypes presented different antibiotic resistance profiles and genotyping analysis showed that they belonged to distinct clones, indicating that at day 57 after the admission the patient was simultaneously colonized by three distinct P. aeruginosa isolates. On the other hand, the nine colony variants presented heterogeneous antibiotic resistance profiles and clustered together with the three parental isolates. The understanding of the link between genotype plasticity and antibiotic resistance may contribute to improving our knowledge of this life-threatening pathogen.

Original languageEnglish
Pages (from-to)941-947
Number of pages7
JournalInternational Journal of Immunopathology and Pharmacology
Volume21
Issue number4
Publication statusPublished - Oct 2008

Keywords

  • Colony variant
  • f-AFLP
  • Genome plasticity
  • Pseudomonas aeruginosa
  • rep-PCR fingerprinting

ASJC Scopus subject areas

  • Pharmacology
  • Immunology
  • Immunology and Allergy

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