新的连续实验进化方法揭示了抵抗的快速发展和交叉抵抗
Thaddäus Echelmeyer1, Markus Ellmann1, Stefan E Heiden1
1Department of Epidemiology and Ecology of Antimicrobial Resistance, Helmholtz Institute for One Health, Helmholtz Centre for Infection Research, Greifswald, Germany.
npj antimicrobials and resistance
|March 3, 2026
概括
一个新的实验进化系统迅速发现了抗塞菲皮姆的Enterobacter cloacae. 在blaMIR-11中发生的单一突变导致对新型抗生素的交叉耐药性,突出显示了抗菌素耐药性发展的风险.
科学领域:
- 微生物学 微生物学
- 分子生物学分子生物学
- 进化生物学 进化生物学
背景情况:
- 抗菌素耐药性 (AMR) 是一个关键的全球健康挑战.
- 实验进化有助于理解耐药机制和抗生素保存策略.
- 肠杆菌cloacae复杂菌株是人类显著的病原体.
研究的目的:
- 开发和验证一种新的持续实验进化系统,用于研究AMR.
- 为了研究Enterobacter cloacae中cefepime耐药性的发展.
- 识别对新型抗生素的耐药性机制和潜在的交叉耐药性.
主要方法:
- 开发一个连续的实验进化系统与不断上升的抗生素梯度.
- 该系统应用于三个cefepime-naive Enterobacter cloacae复杂菌株.
- 基因组分析以确定赋予耐药性的突变.
主要成果:
- 在所有菌株中,在暴露于cefepime的四天内出现了耐药突变.
- 一个突变体对Cefiderocol和Ceftazidime-avibactam产生了交叉耐药性.
- 在blaMIR-11中,单个错误的突变被确定为主要交叉耐药性的原因.
结论:
- 新的实验进化系统对于研究AMR发展是有效的.
- 一个blaMIR-11突变赋予了显著的交叉耐药性,对当前和未来的抗生素疗效构成威胁.
- 了解耐药机制对于保持抗生素有效性至关重要.
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