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诱导性转体子突变发生能在小鼠感染期间识别细菌适应性决定因素

David W Basta¹, Ian W Campbell^2,3, Emily J Sullivan^2,3

¹Department of Pathology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA. dbasta@bwh.harvard.edu.

Nature microbiology

|March 28, 2025

概括

InducTn-seq通过启用受控的转子子插入来增强细菌遗传学,为敏感的适应性研究产生数百万种突变. 这种方法克服了瓶,揭示了像CRISPR这样的新基因功能.

科学领域:

微生物学微生物学
细菌遗传学细菌遗传学
分子生物学分子生物学

背景情况:

转子体插入测序 (Tn-seq) 对细菌遗传学至关重要,但面临着局限性.
低效的分娩和人口瓶限制了突变物种的多样性和敏感性.

研究的目的:

开发一种改进的Tn-seq方法,对转换进行时间控制.
为了增强突变的多样性,更敏感的基因组规模的健身分析.

主要方法:

开发了"InducTn-seq",使用一种可诱导阿拉比诺斯的Tn5转化酶.
在各种细菌物种 (大肠杆菌,S. typhimurium,S. flexneri,C. rodentium) 中产生了数百万个突变.
在感染性结肠炎的小鼠模型中应用InducTn-seq,以克服宿主瓶.

主要成果:

每个殖民地InducTn-seq产生了多达120万个突变,显著增加了多样性.
能够灵敏地检测微妙的健康缺陷,并进行定量健康测量.
在小鼠体内查结果>5x10^5突变,确定了C. rodentium中的CRISPR毒素相互作用.

结论:

InducTn-seq为细菌前进遗传学提供了卓越的灵敏度和吞吐量.
这种方法有效地绕过了感染模型中的宿主瓶.
突出了InducTn-seq在综合基因组规模选中的潜力.

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