Universität zu Köln

Xu, Qingye, Hua, Xiaoting, He, Jintao, Zhang, Di, Chen, Qiong, Zhang, Linghong, Loh, Belinda ORCID: 0000-0003-1364-6911, Leptihn, Sebastian ORCID: 0000-0002-4847-4622, Wen, Yurong, Higgins, Paul G. ORCID: 0000-0001-8677-9454, Yu, Yunsong and Zhou, Zhihui (2020). The distribution of mutations and hotspots in transcription regulators of resistance-nodulation-cell division efflux pumps in tigecycline non-susceptible Acinetobacter baumannii in China. Int. J. Med. Microbiol., 310 (8). MUNICH: ELSEVIER GMBH. ISSN 1618-0607

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Abstract

Objective: Acinetobacter baumannii has emerged as a problematic hospital pathogen and tigecycline is among the few remaining antibiotics retaining activity against multidrug-resistant A. baumannii. This study was aimed to elucidate the tigecycline resistance mechanisms in 28 unique clinical A. baumannii strains from nine provinces in China. Methods: Whole genome sequences were obtained via Illumina HiSeq sequencing and regulatory genes of efflux pumps were analyzed. Minimal inhibitory concentrations (MICs) were determined by agar/micmbroth dilution according to the guidelines recommended by Clinical and Laboratory Standards Institute (CLSI). Tigecycline susceptibility data was interpreted using breakpoints for Enterobacterales recommended by EUCAST v8.1. Results: The majority of isolates belonged to the international clonal lineage IC2 (n = 27, 96.4%). Four isolates were considered tigecycline-intermediate (MIC = 2 mg/L), twenty-four isolates were tigecycline-resistant. The insertion of ISAbal in adeS was found in six isolates and was the most prevalent insertion element (IS). In four isolates we observed an insertion of ISAbal in adeN, and two of them had 1526 insertions. Two mutations in adeN (deletion and premature stop codon) were observed only in the MIC = 4 mg/L isolates. Other mutations in adeRS (amino acid insertion/substitutions and premature stop codons) were only detected in the MIC > 8 group. The novel substitutions E219 K in adeR and A130 T in adeS were observed in five and four isolates respectively, suggesting a mutational hotspot. Conclusions: This study demonstrates that changes in transcription regulators were important mechanisms in tigecycline resistance in A. baumannii. Also, we identified several chromosomal hotspots that can be used for prediction of tigecycline resistance.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Xu, Qingye UNSPECIFIED UNSPECIFIED UNSPECIFIED Hua, Xiaoting UNSPECIFIED UNSPECIFIED UNSPECIFIED He, Jintao UNSPECIFIED UNSPECIFIED UNSPECIFIED Zhang, Di UNSPECIFIED UNSPECIFIED UNSPECIFIED Chen, Qiong UNSPECIFIED UNSPECIFIED UNSPECIFIED Zhang, Linghong UNSPECIFIED UNSPECIFIED UNSPECIFIED Loh, Belinda UNSPECIFIED orcid.org/0000-0003-1364-6911 UNSPECIFIED Leptihn, Sebastian UNSPECIFIED orcid.org/0000-0002-4847-4622 UNSPECIFIED Wen, Yurong UNSPECIFIED UNSPECIFIED UNSPECIFIED Higgins, Paul G. UNSPECIFIED orcid.org/0000-0001-8677-9454 UNSPECIFIED Yu, Yunsong UNSPECIFIED UNSPECIFIED UNSPECIFIED Zhou, Zhihui UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-309604
DOI:	10.1016/j.ijmm.2020.151464
Journal or Publication Title:	Int. J. Med. Microbiol.
Volume:	310
Number:	8
Date:	2020
Publisher:	ELSEVIER GMBH
Place of Publication:	MUNICH
ISSN:	1618-0607
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language CARBAPENEM-RESISTANT; GENOME SEQUENCE; IN-VITRO; EPIDEMIOLOGY; MECHANISMS; OXA-23; GENE; ADER Multiple languages Microbiology; Virology Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/30960