Endemic Indian clones of Klebsiella pneumoniae‑harbouring New Delhi metallo‑beta‑lactamase‑1 on a hybrid plasmid replicon type: A case of changing New Delhi metallo‑beta‑lactamase plasmid landscapes in India.
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Date
2016-07
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Abstract
Purpose: blaNDM genes are MBL genes that confer resistance to carbapenems. Globally, they are associated with diverse
clones and plasmids. In this study, we characterised three isolates of Klebsiella pneumoniae‑harbouring blaNDM1 from
patients undergoing chronic haemodialysis and renal transplantation. Materials and Methods: 3 blaNDM1‑producing
K. pneumoniae were isolated from end‑stage renal disease patients undergoing haemodialysis and renal transplantation
from a nephrology unit. All the three isolates were screened for clinically relevant resistant genes. Plasmid replicon
content was analysed by polymerase chain reaction based replicon typing. Conjugation assays were done using
azide‑resistant Escherichia coli J53 as the recipient strain. Multilocus sequence typing and variable number tandem
repeat typing were done to find the clonality. Replicon sequence based typing was attempted to find the diversity of
replicon‑associated sequences in IncHI3 plasmids. Results: All the 3 blaNDM positive isolates possessed the New
Delhi metallo‑beta‑lactamase‑1 (NDM‑1) allele with an IncHI3 plasmid which was not transferable in one isolate. The
isolates were found to be sequence type 14 (ST14; 2 nos) and ST38 both of which were previously reported to be the
NDM‑producing K. pneumoniae STs prevalent in India. Replicon sequence analysis revealed limited sequence diversity
within the repHI3 and repFIB locus. Conclusion: To the best of our knowledge, this is the first report of IncHI3, a newly
assigned enterobacterial plasmid incompatibility group from India. This could either be a case of importation or a widely
circulating NDM plasmid type in India.
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Keywords
Carbapenemase, IncHI3, MBL, New Delhi metallo‑beta‑lactamase‑1
Citation
Subramanian G K, Soundari P G, Ramanathan V, Krishnan P. Endemic Indian clones of Klebsiella pneumoniae‑harbouring New Delhi metallo‑beta‑lactamase‑1 on a hybrid plasmid replicon type: A case of changing New Delhi metallo‑beta‑lactamase plasmid landscapes in India. Indian Journal of Medical Microbiology. 2016 July-Sept; 34(3): 286-292.