[Source: Journal of Antimicrobial Chemotherapy, full page: (LINK). Abstract, edited.]
Whole genome assembly and functional portrait of hypervirulent extensively drug-resistant NDM-1 and KPC-2 co-producing Klebsiella pneumoniae of capsular serotype K2 and ST86
Yang Liu, Dan Long, Tian-Xin Xiang, Fang-Ling Du, Dan Dan Wei, La-Gen Wan, Qiong Deng, Xian-Wei Cao, Wei Zhang
Journal of Antimicrobial Chemotherapy, dkz023, https://doi.org/10.1093/jac/dkz023
Published: 06 March 2019
To characterize an emergent carbapenem-resistant hypervirulent Klebsiella pneumoniae (CR-hvKP) strain, NUHL30457, which co-produces NDM-1 and KPC-2 carbapenemases.
We performed WGS analysis on a clinical carbapenemase-producing hypervirulent K. pneumoniae (CP-hvKP) strain NUHL30457. Sequence data were analysed using comparative genomics and phylogenetics. WGS was used to perform MLST, capsular genotyping and identification of virulence and antimicrobial resistance genes. The virulence of NUHL30457 was analysed by serum killing assay, neutrophil phagocytosis and mouse lethality assay.
The NUHL30457 strain was carbapenem resistant and belonged to ST86 and serotype K2. A significant increase in resistance to serum killing and antiphagocytosis was found in the NUHL30457 strain compared with the reference strain. The murine lethality assay showed an LD50 of 2.5 × 102 cfu for the NUHL30457 strain, indicating hypervirulence. WGS revealed that NUHL30457 has a single 5.3 Mb chromosome (57.53% G + C content) and four plasmids in the range 49.2–215.7 kb. The incompatibility group (Inc)N plasmid p30457-4 carried the blaNDM-1 and qnrS1 genes. The IncFII(K) plasmid p30457-3 also carried an array of resistance elements, including blaCTX-M-65, blaTEM-1 and blaKPC-2. The IncHI1/IncFIB plasmid p30457-1, which carried virulence genes, was identical to a pLVPK plasmid reported previously.
To the best of our knowledge, this is the first report to isolate an ST86 hvKP strain that co-produces NDM-1 and KPC-2 carbapenemase. Further investigation is required to reinforce our understanding of the epidemiology and virulence mechanisms of this clinically significant CP-hvKP.
Topic: plasmids – epidemiology – chromosomes – drug resistance, microbial – genes – genome – genomics – klebsiella pneumoniae – lethal dose 50 – neutrophils – phagocytosis – mice – virulence – genotype determination – beta-lactamase ndm-1 – phylogenetic analysis – killing – hypervirulent variant of klebsiella pneumoniae – serotype – synthetic cannabinoids – carbapenem resistance – whole genome sequencing
Issue Section: ORIGINAL RESEARCH
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Keywords: Antibiotics; Drugs Resistance; Meropenem; Beta-lactams; NDM1; Klebsiella pneumoniae.