Journal of Laboratory Physicians
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ORIGINAL ARTICLE
Year : 2019  |  Volume : 11  |  Issue : 4  |  Page : 305-311

Co occurrence of two 16S rRNA methyltrasferases along with NDM and OXA 48 like carbapenamases on a single plasmid in Klebsiella pneumoniae


Department of Microbiology, Sri Ramachandra Institute for Higher Education and Research, Chennai, Tamil Nadu, India

Correspondence Address:
Dr. K V L. Aishwarya
Department of Microbiology, Sri Ramachandra Institute for Higher Education and Research, Chennai - 600 116, Tamil Nadu
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/JLP.JLP_59_19

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Abstract: BACKGROUND: The carbapenemase-encoding genes, blaNDM- and blaOXA-48-like, confer resistance to all the known beta-lactams and are encountered along with other beta-lactamase-encoding genes and/or 16S ribosomal RNA (rRNA)-methylating genes. The co-occurrence of blaNDMand blaOXA-48-likeon a single plasmid is a rare occurrence. AIM AND OBJECTIVE: The purpose of the study was to characterize the plasmids in Klebsiella pneumoniae isolates producing 16S rRNA methyltransferase along with blaNDM, blaOXA-48-like, and other resistance encoding genes. MATERIALS AND METHODS: One-hundred and seventeen K. pneumoniae clinical isolates which were resistant to aminoglycosides were collected. Polymerase chain reaction-based screening for 16S rRNA methyltransferase genes armA, rmtB, and rmtC; carbapenamase genes blaNDM, blaOXA-48-like, blaIMP,blaVIM,and blaKPC; and other resistance genes such as blaTEM,blaSHV,blaCTX-M, and qnr (A, B, and S) determinants acc (6') Ib-cr was performed. Conjugation experiment was carried out for seven isolates that anchored blaNDMand blaOXA-48-likealong with any one of the 16S rRNA methyltransferases. The plasmid-based replicon typing for different plasmid-incompatible (Inc) group was performed on the conjugatively transferable plasmids. RESULTS: Among the 16S rRNA methyltransferases, armA was more predominant. blaNDMand blaOXA-48-likewere present in 56 (47.86%) and 22 (18.80%) isolates, respectively. Out of seven isolates which were conjugatively transferable, only four had blaNDMand blaOXA-48-likeon the same plasmid and they belonged to Inc N and A/C replicon. Three isolates co-harbored 16S rRNA methyltransferases armA, rmtB, and rmtC, and out of the them, one isolate harbored two 16S rRNA methyltransferases armA and rmtB, on the single-plasmid replicon A/C. CONCLUSION: This is the first report revealing the coexistence of blaNDMand blaOXA-48-likeco-harboring two 16S rRNA methylases on a single conjugative plasmid replicon belonging to incompatibility group A/C.


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