TY - JOUR
T1 - Genome and plasmid context of two rmtG-carrying Enterobacter hormaechei isolated from urinary tract infections in Brazil
AU - Martins, Evelin Rodrigues
AU - Bueno, Maria Fernanda Campagnari
AU - Francisco, Gabriela Rodrigues
AU - Casella, Tiago
AU - de Oliveira Garcia, Doroti
AU - Cerdeira, Louise Teixeira
AU - Gerber, Alexandra Lehmkuhl
AU - de Almeida, Luiz Gonzaga Paula
AU - Lincopan, Nilton
AU - de Vasconcelos, Ana Tereza Ribeiro
AU - Nogueira, Mara Corrêa Lelles
AU - Estofolete, Cassia Fernanda
PY - 2020/3
Y1 - 2020/3
N2 - Objectives: Enterobacter hormaechei is an important causative agent of severe infections in critically ill patients. Aminoglycosides are among the main antibiotics for the treatment of E. hormaechei infections, however the development of antimicrobial resistance is an increasing problem. RmtG is a 16S rRNA methyltransferase, a class of enzymes conferring high-level resistance to clinically relevant aminoglycosides. The aim of this study was to characterise the full genetic context of plasmids harbouring the rmtG gene in two aminoglycoside-resistant E. hormaechei isolated in Brazil. Methods: ThermtG-harbouring plasmids were transferred to an Escherichia coli J53 recipient strain and were fully sequenced using a MiSeq sequencing system. Complete genome assemblies were accomplished using a combination of Newbler v.3.0, SPAdes 3.10.0 and phrap/cross_match programs. Plasmid sequences were annotated using RAST server and were then manually curated using BLAST databases and ISfinder. Easyfig 2.0 was used to map and compare regions of interest containing rmtG in both plasmids. Results: Both isolates carried thermtG gene on an IncA/C plasmid of ˜152 kb and ˜235 kb, respectively, associated with a Tn3 transposon. The plasmids contain a transfer region as well as genes involved in plasmid stability and resistance to β-lactams, sulfonamides and quaternary ammonium compounds. One of the plasmids also carried the mrk operon encoding type 3 fimbriae. Conclusion: This first detection ofrmtG in E. hormaechei supports the ability for horizontal transfer. The location in complex genetic platforms carried by Tn3 transposons in IncA/C plasmids may facilitate dissemination to other Gram-negative pathogens, further limiting treatment options.
AB - Objectives: Enterobacter hormaechei is an important causative agent of severe infections in critically ill patients. Aminoglycosides are among the main antibiotics for the treatment of E. hormaechei infections, however the development of antimicrobial resistance is an increasing problem. RmtG is a 16S rRNA methyltransferase, a class of enzymes conferring high-level resistance to clinically relevant aminoglycosides. The aim of this study was to characterise the full genetic context of plasmids harbouring the rmtG gene in two aminoglycoside-resistant E. hormaechei isolated in Brazil. Methods: ThermtG-harbouring plasmids were transferred to an Escherichia coli J53 recipient strain and were fully sequenced using a MiSeq sequencing system. Complete genome assemblies were accomplished using a combination of Newbler v.3.0, SPAdes 3.10.0 and phrap/cross_match programs. Plasmid sequences were annotated using RAST server and were then manually curated using BLAST databases and ISfinder. Easyfig 2.0 was used to map and compare regions of interest containing rmtG in both plasmids. Results: Both isolates carried thermtG gene on an IncA/C plasmid of ˜152 kb and ˜235 kb, respectively, associated with a Tn3 transposon. The plasmids contain a transfer region as well as genes involved in plasmid stability and resistance to β-lactams, sulfonamides and quaternary ammonium compounds. One of the plasmids also carried the mrk operon encoding type 3 fimbriae. Conclusion: This first detection ofrmtG in E. hormaechei supports the ability for horizontal transfer. The location in complex genetic platforms carried by Tn3 transposons in IncA/C plasmids may facilitate dissemination to other Gram-negative pathogens, further limiting treatment options.
KW - 16S rRNA methyltransferase
KW - Aminoglycoside resistance
KW - Enterobacter hormaechei
KW - rmtG
UR - http://www.scopus.com/inward/record.url?scp=85076120377&partnerID=8YFLogxK
U2 - 10.1016/j.jgar.2019.06.020
DO - 10.1016/j.jgar.2019.06.020
M3 - Article
C2 - 31279132
AN - SCOPUS:85076120377
SN - 2213-7165
VL - 20
SP - 36
EP - 40
JO - Journal of Global Antimicrobial Resistance
JF - Journal of Global Antimicrobial Resistance
ER -