Decoding the enigma: unveiling the transmission characteristics of waterfowl-associated bla NDM-5-positive Escherichia coli in select regions of China.

IF 4 2区 生物学 Q2 MICROBIOLOGY
Frontiers in Microbiology Pub Date : 2024-12-09 eCollection Date: 2024-01-01 DOI:10.3389/fmicb.2024.1501594
Shaqiu Zhang, Yanxi Shu, Zhechen Yang, Zhijun Zhong, Mingshu Wang, Renyong Jia, Shun Chen, Mafeng Liu, Dekang Zhu, Xinxin Zhao, Ying Wu, Qiao Yang, Juan Huang, Xumin Ou, Di Sun, Bin Tian, Zhen Wu, Yu He, Anchun Cheng
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Abstract

Escherichia coli (E. coli) serves as a critical indicator microorganism for assessing the prevalence and dissemination of antibiotic resistance, notably harboring various antibiotic-resistant genes (ARGs). Among these, the emergence of the bla NDM gene represents a significant threat to public health, especially since carbapenem antibiotics are vital for treating severe infections caused by Gram-negative bacteria. This study aimed to characterize the antibiotic resistance features of bla NDM-5-positive E. coli strains isolated from waterfowl in several regions of China and elucidate the dissemination patterns of the bla NDM-5 gene. We successfully isolated 103 bla NDM-5-positive E. coli strains from 431 intestinal fecal samples obtained from waterfowl across five provincial-level units in China, with all strains exhibiting multidrug resistance (MDR). Notably, the bla NDM-5 gene was identified on plasmids, which facilitate efficient and stable horizontal gene transfer (HGT). Our adaptability assays indicated that while the bla NDM-5-positive plasmid imposed a fitness cost on the host bacteria, the NDM-5 protein was successfully induced and purified, exhibiting significant enzymatic activity. One strain, designated DY51, exhibited a minimum inhibitory concentration (MIC) for imipenem of 4 mg/L, which escalated to 512 mg/L following exposure to increasing imipenem doses. This altered strain demonstrated stable resistance to imipenem alongside improved adaptability, correlating with elevated relative expression levels of the bla NDM-5 and overexpression of efflux pumps. Collectively, this study highlights the horizontal dissemination of the bla NDM-5 plasmid among E. coli strains, confirms the associated fitness costs, and provides insights into the mechanisms underlying the stable increase in antibiotic resistance to imipenem. These findings offer a theoretical framework for understanding the dissemination dynamics of bla NDM-5 in E. coli, which is essential for developing effective strategies to combat carbapenem antibiotic resistance.

解开谜团:揭示水禽相关bla ndm -5阳性大肠杆菌在中国部分地区的传播特征
大肠杆菌(E. coli)是评估抗生素耐药性流行和传播的重要指示微生物,特别是携带各种抗生素耐药基因(ARGs)。其中,bla NDM基因的出现对公共卫生构成重大威胁,特别是因为碳青霉烯类抗生素对于治疗革兰氏阴性菌引起的严重感染至关重要。本研究旨在研究中国部分地区水禽中bla NDM-5阳性大肠杆菌的耐药性特征,并阐明bla NDM-5基因的传播模式。我们从中国5个省级单位的431份水禽肠道粪便样本中成功分离出103株bla ndm -5阳性大肠杆菌,所有菌株均表现出多药耐药(MDR)。值得注意的是,bla NDM-5基因被鉴定在质粒上,这有助于高效、稳定的水平基因转移(HGT)。我们的适应性试验表明,虽然bla NDM-5阳性质粒对宿主细菌施加了适应度成本,但NDM-5蛋白被成功诱导和纯化,并表现出显著的酶活性。其中一株名为DY51的菌株对亚胺培南的最低抑制浓度(MIC)为4 mg/L,随着亚胺培南剂量的增加,最低抑制浓度上升至512 mg/L。这种改变的菌株对亚胺培南表现出稳定的抗性,同时也表现出更好的适应性,这与bla NDM-5的相对表达水平升高和外排泵的过表达有关。总的来说,本研究强调了bla NDM-5质粒在大肠杆菌菌株中的水平传播,证实了相关的适应成本,并提供了对亚胺培南抗生素耐药性稳定增长的机制的见解。这些发现为理解bla NDM-5在大肠杆菌中的传播动力学提供了理论框架,这对于制定有效的策略来对抗碳青霉烯类抗生素耐药性至关重要。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
7.70
自引率
9.60%
发文量
4837
审稿时长
14 weeks
期刊介绍: Frontiers in Microbiology is a leading journal in its field, publishing rigorously peer-reviewed research across the entire spectrum of microbiology. Field Chief Editor Martin G. Klotz at Washington State University is supported by an outstanding Editorial Board of international researchers. This multidisciplinary open-access journal is at the forefront of disseminating and communicating scientific knowledge and impactful discoveries to researchers, academics, clinicians and the public worldwide.
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