携带新型 VIM 型β-内酰胺酶 blaVIM-84 的 MDR 蒙蒂利假单胞菌的基因组特征。

IF 3.7 3区 医学 Q2 INFECTIOUS DISEASES Journal of global antimicrobial resistance Pub Date : 2024-10-22 DOI:10.1016/j.jgar.2024.09.007
Jinjing Tu, Yi Liu, Wenjing Xu, Xiaoqi Dong, Liang Zhang, Jiajie Qian, Shuguang Xu
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引用次数: 0

摘要

研究目的本研究旨在通过全基因组测序确定从人体肠道中分离的耐多药单孔假单胞菌中携带新型 VIM 型 β-内酰胺酶(VIM-84)的质粒的遗传环境和特征:使用基因组 DNA 分离试剂盒(QIAGEN,Hilden,德国)提取 P. monteilii L2757hy 的 DNA。采用 Illumina NovaSeq 6000 和 Oxford Nanopore 平台进行全基因组测序。在含有利福平和美罗培南的 MHA 平板上筛选单克隆耐药基因的可转移性。以铜绿假单胞菌 PAO1Ri 为接收菌株,使用 MALDI/TOF-MS 和 PCR 进行验证:结果:通过测序和 ANI 分析,L2757hy 被鉴定为 P. monteilii。其基因组被定为 ST147,由一条 6,130,057 bp 的染色体和一条 49,704 bp 的质粒组成,染色体的 GC 含量为 61.8%。染色体上发现了几个抗性基因,包括 blaIMP-1、aac(6')-Ⅱa 和 tmexCD-toprJ,以及 iroN 和 wzaJ 等毒力基因。在质粒上发现了一种新的 VIM 型 blaVIM-84,这种质粒以前曾在铜绿假单胞菌中发现过。携带 blaVIM-84 的质粒是不可分的,它可以转移到铜绿假单胞菌 PAO1Ri 上,并与一个 I 类整合子相关联,其遗传环境为 intI1-blaVIM-84-tniR-tniQ-tniB-tniA,可能来自 Tn402:结论:我们的研究发现,新型 blaVIM-84 基因是由蒙特伊利杆菌而非铜绿假单胞菌携带的。我们认为,P. monteilii 可能是耐药基因的储存库。
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Genome characteristics of a MDR Pseudomonas monteilii carrying a novel VIM-type β-lactamase, blaVIM-84.

Objectives: This study aimed to determine the genetic environment and characterize plasmid carrying a novel VIM-type β-lactamase (VIM-84) in a multidrug-resistant Pseudomonas monteilii isolate obtained from the human gut through whole-genome sequencing.

Methods: DNA extraction of P. monteilii L2757hy was performed using the Genomic DNA Isolation Kit (QIAGEN, Hilden, Germany). Whole-genome sequencing was performed by Illumina NovaSeq 6000 and Oxford Nanopore platforms. The transferability of resistance genes was screened single clonal on MHA plates containing rifampicin and meropenem. Verification was performed using MALDI/TOF-MS and PCR with Pseudomonas aeruginosa PAO1Ri as the recipient strain.

Results: L2757hy was identified as P. monteilii through sequencing and ANI analysis. The genome was assigned as ST147 and comprised a 6,130,057 bp chromosome with a GC content of 61.8% and a 49,704 bp plasmid. Several resistance genes, including blaIMP-1, aac(6')-IIa and tmexCD-toprJ, as well as virulence genes such as iroN, and wzaJ, were identified on the chromosome. A novel VIM-type blaVIM-84 was found on the plasmid, which was previously identified in Pseudomonas aeruginosa. Plasmid harboring blaVIM-84 was untypable, and it could be transferred to P. aeruginosa PAO1Ri and was associated with a class I integron with the genetic environment intI1-blaVIM-84-tniR-tniQ-tniB-tniA, likely derived from Tn402.

Conclusions: Our study revealed that the novel blaVIM-84 gene was harbored by P. monteilii rather than P. aeruginosa. We suggested that P. monteilii may serve as a reservoir for resistance genes.

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来源期刊
Journal of global antimicrobial resistance
Journal of global antimicrobial resistance INFECTIOUS DISEASES-PHARMACOLOGY & PHARMACY
CiteScore
8.70
自引率
2.20%
发文量
285
审稿时长
34 weeks
期刊介绍: The Journal of Global Antimicrobial Resistance (JGAR) is a quarterly online journal run by an international Editorial Board that focuses on the global spread of antibiotic-resistant microbes. JGAR is a dedicated journal for all professionals working in research, health care, the environment and animal infection control, aiming to track the resistance threat worldwide and provides a single voice devoted to antimicrobial resistance (AMR). Featuring peer-reviewed and up to date research articles, reviews, short notes and hot topics JGAR covers the key topics related to antibacterial, antiviral, antifungal and antiparasitic resistance.
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