Vijayakumar S, Wattal C, J K O, Bhattacharya S, Vasudevan K, Anandan S, Walia K, Veeraraghavan B. Insights into the complete genomes of carbapenem-resistant
Acinetobacter baumannii harbouring
bla OXA-23, bla OXA-420 and
bla NDM-1 genes using a hybrid-assembly approach.
Access Microbiol 2020;
2:acmi000140. [PMID:
32974602 PMCID:
PMC7497828 DOI:
10.1099/acmi.0.000140]
[Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2019] [Accepted: 05/10/2020] [Indexed: 12/20/2022] Open
Abstract
Carbapenem resistance in Acinetobacter baumannii is due to blaOXA-23, which is endemic in India. Recently, the sporadic presence of blaOXA-58 as well as the occurrence of dual carbapenemases were observed. The mobility as well as the dissemination of these resistance genes were mainly mediated by various mobile genetic elements. The present study was aimed at characterizing the genetic arrangement of blaOXA-23, blaNDM-1 and blaOXA-58 identified in two complete genomes of carbapenem-resistant A. baumannii (CRAB). Complete genomes obtained using a hybrid-assembly approach revealed the accurate arrangement of Tn2006 with blaOXA-23, ISAba125 with blaNDM and ISAba3 with blaOXA-58. In addition, the association of IntI1 integrase with the blaCARB-2 gene and several virulence factors required for type-IV pili assembly, motility and biofilm formation have been identified. The current study provided deeper insight into the complete characterization of insertion sequences and transposons associated with the carbapenem-resistant genes using short reads of IonTorrent PGM and long reads of MinIon in A. baumannii.
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