单菌株移动组序列测定量化了细菌对压力的遗传反应,包括IS元素,菌体,RNA和REPIN的活动
Tue Kjærgaard Nielsen1, Lars Hestbjerg Hansen1
1Department of Plant and Environmental Sciences, University of Copenhagen, Frederiksberg 1871, Denmark.
Plasmid
|September 25, 2025
概括
移动遗传元素 (MGE) 重组微生物的基因组. 像铜和SDS这样的压力因素积极诱导染色体外DNA的形成,揭示了动态基因组可塑性和MGE活性.
科学领域:
- 微生物学 微生物学
- 基因组学就是基因组学.
- 分子生物学分子生物学
背景情况:
- 微生物基因组是动态的,由移动遗传元素 (MGE) 不断重塑.
- 基因组测序提供了静态快照,限制了对MGE驱动的基因组进化和可塑性的理解.
- 像抗生素耐药性这样的表型特征可能来自MGE介导的基因组重组.
研究的目的:
- 在各种压力条件下调查大肠杆菌K-12 MG1655中MGE的动态活性.
- 量化外染色体圆形DNA (eccDNA) 和其他遗传元素在环境压力因素的反应中形成的数量.
- 探索MGE调动,基因组可塑性和抗生素耐药性的共同选择之间的联系.
主要方法:
- 对大肠杆菌K-12 MG1655.5的单菌株移动基因组测序进行了应用.
- 细胞暴露于各种压力条件,包括紫外线,SDS,纳利迪克酸,四环素, cetrimide 和铜.
- 进行了MGE活动的量化,包括IS元素,RNA基因,prophages和重复位点.
主要成果:
- 铜和SDS被确定为来自特定IS元素的eccDNA形成的显著诱导剂.
- 在压力下观察到高水平的RNA/DNA异质复合体和Rhs核酶蛋白,特别是在铜和SDS.
- 该研究量化了各种遗传元素的活性,如IS元素,RNA基因,e14prophage和REP网站.
结论:
- 移动基因组测序有效量化微生物对环境压力的遗传反应.
- MGE的调动,特别是由铜诱导的IS元素,有助于基因组的可塑性.
- 这些发现支持微生物群体中重金属,抗生素耐药性基因和MGE的共同选择.
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