Genome-based Characterization of Two Colombian Clinical Providencia Rettgeri Isolates Co-harboring NDM-1, VIM-2, and Other β-lactamases

Overview

Journal BMC Microbiol

Publisher Biomed Central

Specialty Microbiology

Date 2020 Nov 13

PMID 33183231

Citations 9

Authors

Adriana Piza-Buitrago

Veronica Rincon

John Donato

Sandra Yamile Saavedra

Carolina Duarte

Jaime Morero

Laurent Falquet

Maria Teresa Reguero

Emiliano Barreto-Hernandez

Affiliations

Soon will be listed here.

Abstract

Background: Providencia rettgeri is a nosocomial pathogen associated with urinary tract infections and related to Healthcare-Associated Infection (HAI). In recent years isolates producing New Delhi Metallo-β-lactamase (NDM) and other β-lactamases have been reported that reduce the efficiency of clinical antimicrobial treatments. In this study, we analyzed antibiotic resistance, the presence of resistance genes and the clonal relationship of two P. rettgeri isolates obtained from male patients admitted to the same hospital in Bogotá - Colombia, 2015.

Results: Antibiotic susceptibility profile evaluated by the Kirby-Bauer method revealed that both isolates were resistant to third-generation carbapenems and cephalosporins. Whole-genome sequencing (Illumina HiSeq) followed by SPAdes assembling, Prokka annotation in combination with an in-house Python program and resistance gene detection by ResFinder identified the same six β-lactamase genes in both isolates: bla, bla, bla, bla, bla and bla. Additionally, various resistance genes associated with antibiotic target alteration (arnA, PmrE, PmrF, LpxA, LpxC, gyrB, folP, murA, rpoB, rpsL, tet34) were found and four efflux pumps (RosAB, EmrD, mdtH and cmlA). The additional resistance to gentamicin in one of the two isolates could be explained by a detected SNP in CpxA (Cys191Arg) which is involved in the stress response of the bacterial envelope. Genome BLAST comparison using CGView, the ANI value (99.99%) and the pangenome (using Roary) phylogenetic tree (same clade, small distance) showed high similarity between the isolates. The rMLST analysis indicated that both isolates were typed as rST-61,696, same as the RB151 isolate previously isolated in Bucaramanga, Colombia, 2013, and the FDAARGOS_330 isolate isolated in the USA, 2015.

Conclusions: We report the coexistence of the carbapenemase genes bla, and bla, together with the β-lactamase genes bla, bla, bla and bla, in P. rettgeri isolates from two patients in Colombia. Whole-genome sequence analysis indicated a circulation of P. rettgeri rST-61,696 strains in America that needs to be investigated further.

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