主体氧化压力为快速抗生素耐药性演变的真菌细菌提供了原料
bioRxiv : the preprint server for biology
|December 15, 2025
概括
在氧化应激基因中预先存在的突变加速了Mycobacterium tuberculosis (Mtb) 中的耐药性演变. 宿主免疫压力和药物水平不足促使mtb产生快速抗生素耐药性,这表明了新的治疗点.
科学领域:
- 微生物学 微生物学
- 遗传学 遗传学 是一个
- 药物耐药性 药物耐药性 药物耐药性
背景情况:
- 耐多药性结核菌 (Mtb) 对全球结核病控制构成重大威胁.
- 驱动Mtb药物耐药性快速演变的机制尚未完全理解.
- 现有的范式表明,抗性突变先于补偿性适应.
研究的目的:
- 研究氧化应激反应基因中先前存在的突变如何影响Mtb.中异化物耐药性的演变.
- 挑战对抗性和补偿性适应序列的传统观点.
- 探索宿主施加的氧化应激在加速Mtb耐药性的作用.
主要方法:
- 使用了Mycobacterium smegmatis mc^2 155 (Msm) 作为一个模型生物体.
- 暴露于Msm的亚致死性异化 (INH) 度,以对低水平耐药性和耐受性 (LLRT) 突变进行选择.
- 使用贝叶斯方法分析了临床Mtb分离物,并重新分析了全基因组的CRISPRi屏幕.
主要成果:
- 氧化应激反应调节器 (ohrR) 的功能丧失突变加速了高水平的INH抵抗.
- 亚致命的氧化应激显著增加了Msm.INH抗性演变的速度.
- 氧化应激反应基因的突变与临床隔离物中的INH耐药Mtb菌株有很强的关联.
结论:
- 在氧化应激基因中预先存在的突变为快速,免费的耐药性进化创造了宽容的背景.
- 主体氧化应激和药物透不良可能会协同促进Mtb耐药性.
- 准氧化应激防御可能是缓解结核病抗生素耐药性的策略.
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