Fitness effects of blaCTX-M-15-harbouring F2:A1:B- plasmids on their native Escherichia coli ST131 H30Rx hosts.
J Antimicrob Chemother 2022;
77:2960-2963. [PMID:
35880751 DOI:
10.1093/jac/dkac250]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2022] [Accepted: 06/27/2022] [Indexed: 11/15/2022] Open
Abstract
OBJECTIVES
To investigate the fitness effects of large blaCTX-M-15-harbouring F2:A1:B- plasmids on their native Escherichia coli ST131 H30Rx hosts.
METHODS
We selected five E. coli ST131 H30Rx isolates of diverse origin, each carrying an F2:A1:B- plasmid with the blaCTX-M-15 gene. The plasmid was eliminated from each isolate by displacement using an incompatible curing plasmid, pMDP5_cureEC958. WGS was performed to obtain complete chromosome and plasmid sequences of original isolates and to detect chromosomal mutations in 'cured' clones. High-throughput competition assays were conducted to determine the relative fitness of cured clones compared with the corresponding original isolates.
RESULTS
We were able to successfully eliminate the F2:A1:B- plasmids from all five original isolates using pMDP5_cureEC958. The F2:A1:B- plasmids produced non-significant fitness effects in three isolates and moderate reductions in relative fitness (3%-4%) in the two remaining isolates.
CONCLUSIONS
We conclude that F2:A1:B- plasmids pose low fitness costs in their E. coli ST131 H30Rx hosts. This plasmid-host fitness compatibility is likely to promote the maintenance of antibiotic resistance in this clinically important E. coli lineage.
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