干燥引起的DNA损伤促进了Mycobacterium tuberculosis的耐药性
bioRxiv : the preprint server for biology
|June 12, 2025
概括
结核菌使用干燥诱导的DNA损伤产生突变,帮助其传播. 基因mfd缓冲了利法抗性突变的健身成本,从而增强了传播.
科学领域:
- 微生物学 微生物学
- 遗传学 遗传学 是一个
- 病原体生物学 病原体生物学
背景情况:
- 结核菌菌 (Mtb) 的传播依赖于宿主传播.
- 允许Mtb传播的特征,特别是在气溶时,尚不清楚.
- 干燥是气溶滴形成过程中的关键压力,影响了Mtb的生存.
研究的目的:
- 为了研究Mtb对干燥应激的适应性反应.
- 确定干燥,DNA损伤和Mtb传播之间的机制.
- 探索mfd基因在mtb适应性和耐药性中的作用.
主要方法:
- 将Mtb暴露在干燥应激中以诱导DNA损伤.
- 对DNA修复反应和突变生成的分析.
- 在干燥过程中对mfd的基因表达分析.
- 在气溶液中评估mfd在mtb存活率和利法抗性的功能.
- 临床Mtb菌株的全基因组测序.
主要成果:
- 干燥导致MTb中的氧化损伤和不完美的DNA修复,导致突变.
- 干燥过程中发生了增加的mfd表达,但主要是缓冲rpoB突变的健身成本.
- 沉默mfd在气溶化过程中损害了抗利法的Mtb菌株 (S450L等位基因) 的存活率.
- 来自5万多个菌株的基因组数据支持mfd在传播相关耐药性中的作用.
结论:
- Mtb对干燥具有传输特异性的应激反应.
- 干燥引起的DNA损伤可以成为Mtb.遗传多样化的来源.
- 该mfd基因通过缓冲耐药转移突变,在促进耐药mtb菌株的传播方面发挥着至关重要的作用.
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