条件化疗暴露与来自干细胞移植受体的 Clostridioides difficile 隔离物中的表观遗传修饰有关
medRxiv : the preprint server for health sciences
|February 6, 2026
概括
化疗改变了Clostridioides difficile的甲基化,可能会增加毒素的产生和癌症患者中Clostridioides difficile感染 (CDI) 的风险. 这项研究揭示了与CDI病变发生相关的化疗诱导的表观遗传变化.
科学领域:
- 微生物学 微生物学
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 基因组学就是基因组学.
背景情况:
- 困难菌导致感染 (CDI),通常在化疗患者中见到.
- 化疗可以诱导表观遗传变化,但其对C. difficile甲基化的影响尚不清楚.
研究的目的:
- 研究化疗对C. difficile甲基化模式的影响.
- 确定产生毒素和非产生毒素的C. difficile菌株之间的表观遗传差异.
主要方法:
- 从便样本中分离出C. difficile.
- 进行了全基因组测序 (纳米孔和Illumina) 和甲基化分析 (6mA和5mC).
- 使用生物信息学工具 (Dorado,Samtools,Unicycler,Methylartist) 进行数据处理和可视化.
主要成果:
- 在C. difficile中发现的明显的表观遗传特征与毒素表达和化疗暴露有关.
- 化疗显著改变了全球6mA甲基化模式.
- 在化疗后,在毒素基因 (tcdB) 中观察到减少甲基化,而胞基因不受影响.
结论:
- 化疗诱导了C. difficile的表观遗传重塑,特别针对与毒素相关的基因.
- 这些表观遗传修饰可能解释化疗患者的CDI风险增加.
- 这些发现突显了化疗,表观遗传学和C. difficile病变发生之间的联系.
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