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FULL CHARACTERIZATION OF THE INTEGRATIVE AND CONJUGATIVE ELEMENT CARRYING THE METALLO-B-LACTAMASE BLASPM-1 AND BICYCLOMYCIN BCR1 RESISTANCE GENES FOUND IN THE PANDEMIC PSEUDOMONAS AERUGINOSA CLONE SP/ST277
blaSPM-1 gene
bicyclomycin bcr1 resistance genes
pandemic SP/ST277 lineage
Affilliation
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Genética Molecular de Microrganismos. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Genética Molecular de Microrganismos. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Genética Molecular de Microrganismos. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Genética Molecular de Microrganismos. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Genética Molecular de Microrganismos. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Genética Molecular de Microrganismos. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Genética Molecular de Microrganismos. Rio de Janeiro, RJ, Brasil.
Abstract
Objectives: This study aimed to characterize the genomic context of the blaSPM-1 gene in Brazilian strains belonging
to the pandemic Pseudomonas aeruginosa clone SP/ST277.
Methods: WGS of clone SP/ST277 strains was performed using a Nextera paired-end library in an Illumina HiSeq
2500 sequencer. blaSPM-1 context was assessed by de novo assembly and gene prediction and annotation tools.
blaSPM-1 was screened in P. aeruginosa genomes through BlastN, and comparative genomics were performed.
Results: The metallo-b-lactamase blaSPM-1 has been disseminated by the pandemic Brazilian P. aeruginosa clone
SP/ST277. In spite of its association with the CR4 element and with the Tn4371 element, the overall blaSPM-1 genomic
context remains uncharacterized and its determination is valuable to understanding gene dispersion
dynamics and the consequent emergence of carbapenem resistance. In this study, blaSPM-1 and its surrounding
sequences (CR4-groEL-blaSPM-1-CR4-groEL) were found in the variable region of an ICE-like element resembling
Tn4371 (where ICE stands for integrative and conjugative element). This element, named ICETn43716061, had 46
ORFs, including the bicyclomycin resistance bcr1 gene. An integrase gene and a set of conjugative transfer genes
were identified. Gene content and order were shared with other Tn4371-ICEs, presenting remarkable amino acid
identities. blaSPM-1 and surrounding sequences were missing in ICETn43716061 of PS600-MA, another isolate
belonging to clone SP/ST277, indicating their mobilization. Eight/nine P. aeruginosa genomes assigned to clone
SP/ST277, by in silico MLST, harboured blaSPM-1 inserted into ICETn43716061.
Conclusions: The presence of blaSPM-1 in a Tn4371-ICE with intact integration/conjugation modules demonstrated
that, besides gene dispersion by clonal expansion of the pandemic SP/ST277 lineage, blaSPM-1 may be
spread through ICE conjugation.
Keywords in Portuguese
Pseudomonas aeruginosaKeywords
Pseudomonas aeruginosablaSPM-1 gene
bicyclomycin bcr1 resistance genes
pandemic SP/ST277 lineage
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