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Title: Intraclonal Genome Stability of the Metallo-beta-lactamase SPM-1-producing Pseudomonas aeruginosa ST277, an Endemic Clone Disseminated in Brazilian Hospitals
Authors: Nascimento, Ana P. B.
Ortiz, Mauro F.
Martins, Willames Marcos Brasileiro da Silva [UNIFESP]
Morais, Guilherme L.
Fehlberg, Lorena Cristina Corrêa [UNIFESP]
Almeida, Luiz G. P.
Ciapina, Luciane P.
Gales, Ana Cristina [UNIFESP]
Vasconcelos, Ana T. R.
Keywords: drug resistance
comparative genomics
pathogenic bacteria
antimicrobial resistance
Gram-negative bacilli
Issue Date: 2016
Publisher: Frontiers Media Sa
Citation: Frontiers In Microbiology. Lausanne, v. 7, p. -, 2016.
Abstract: Carbapenems represent the mainstay therapy for the treatment of serious P aeruginosa infections. However, the emergence of carbapenem resistance has jeopardized the clinical use of this important class of compounds. The production of SPM-1 metallo-beta-lactamase has been the most common mechanism of carbapenem resistance identified in P. aeruginosa isolated from Brazilian medical centers. Interestingly, a single SPM-1-producing P. aeruginosa clone belonging to the ST277 has been widely spread within the Brazilian territory. In the current study, we performed a next-generation sequencing of six SPM-1-producing P. aeruginosa ST277 isolates. The core genome contains 5899 coding genes relative to the reference strain P. aeruginosa PAO1. A total of 26 genomic islands were detected in these isolates. We identified remarkable elements inside these genomic islands, such as copies of the bla(spM-1) gene conferring resistance to carbapenems and a type I-C CRISPR-Cas system, which is involved in protection of the chromosome against foreign DNA. In addition, we identified single nucleotide polymorphisms causing amino acid changes in antimicrobial resistance and virulence-related genes. Together,these factors could contribute to the marked resistance and persistence of the SPM-1-producing P aeruginosa ST277 clone. A comparison of the SPM-1-producing P. aeruginosa ST277 genomes showed that their core genome has a high level nucleotide similarity and synteny conservation. The variability observed was mainly due to acquisition of genomic islands carrying several antibiotic resistance genes.
ISSN: 1664-302X
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