Ceftazidime-Avibactam Resistance Associated with Increased blaKPC-3 Gene Copy Number Mediated by pKpQIL Plasmid Derivatives in Sequence Type 258 Klebsiella pneumoniae

被引:59
作者
Coppi, Marco [1 ]
Di Pilato, Vincenzo [1 ,5 ]
Monaco, Francesco [2 ]
Giani, Tommaso [1 ]
Conaldi, Pier Giulio [2 ,3 ]
Rossolini, Gian Maria [1 ,4 ]
机构
[1] Univ Florence, Dept Expt & Clin Med, Florence, Italy
[2] IRCCS ISMETT, Lab Clin Pathol Microbiol & Virol, Palermo, Italy
[3] IRCCS ISMETT, Dept Res, Palermo, Italy
[4] Florence Careggi Univ Hosp, Clin Microbiol & Virol Unit, Florence, Italy
[5] Univ Genoa, Dept Surg Sci & Integrated Diagnost, Genoa, Italy
关键词
CAZ-AVI; KPC; Tn4401; avibactam; carbapenem-resistant Enterobacterales; carbapenemase; double copy; porin alterations; CARBAPENEMASE-PRODUCING ENTEROBACTERIACEAE; SPECTRUM-BETA-LACTAMASE;
D O I
10.1128/AAC.01816-19
中图分类号
Q93 [微生物学];
学科分类号
071005 ; 100705 ;
摘要
This study reports on the characterization of two ceftazidime-avibactam (CZA)-resistant KPC-producing Klebsiella pneumoniae strains (KP-14159 and KP-8788) sequentially isolated from infections occurred in a patient never treated with CZA. Whole-genome sequencing characterization using a combined short- and long-read sequencing approach showed that both isolates belonged to the same ST258 strain, had altered outer membrane porins (a truncated OmpK35 and an Asp137Thr138 duplication in the L3 loop of OmpK36), and carried novel pKpQIL plasmid derivatives (p11-14159 and pIT-8788, respectively) harboring two copies of the Tn4401a KPC-3-encoding transposon. Plasmid pIT-8788 was a cointegrate of pIT-14159 with a ColE replicon (that was also present in KP-14159) apparently evolved in vivo during infection. pIT-8788 was maintained at a higher copy number than pIT-14159 and, upon transfer to Escherichia coli DH10B, was able to increase the CZA MIC by 32-fold. The present findings provide novel insights about the mechanisms of acquired resistance to CZA, underscoring the role that the evolution of broadly disseminated pKpQIL plasmid derivatives may have in increasing the bfa,p c gene copy number and KPC-3 expression in bacterial hosts. Although not self-transferable, similar elements, with multiple copies of Tn4401 and maintained at a high copy number, could mediate transferable CZA resistance upon mobilization.
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页数:8
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