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在ST1 (BI/NAP1/027) 临床分离物中病毒性和基因组多样性Clostridioides difficile

Qiwen Dong¹, Huaiying Lin², Marie-Maude Allen³

¹Department of Medicine, University of Chicago, Chicago, IL 60637, USA; Duchossois Family Institute, University of Chicago, Chicago, IL 60637, USA.

|July 31, 2023

概括

在Clostridioides difficile ST1菌株中,一种特定的基因缺失显著降低了疾病的严重程度,而不会影响殖民. 这一发现可能会提高C. difficile大肠炎的诊断准确性.

科学领域:

微生物学微生物学
传染性疾病传染性疾病
基因组学就是基因组学.

背景情况:

困难菌通过产生毒素引起大肠炎,但疾病的严重程度各不相同.
宿主因素和细菌菌株差异与可变的C. difficile感染严重程度有关.

研究的目的:

在小鼠模型中研究23种流行性Clostridioides difficile ST1临床隔离物中的毒性变异.
确定导致C. difficile引起的疾病严重程度差异的遗传因素.

主要方法:

在小鼠中感染23个C. difficile ST1分离体.
评估殖民密度和疾病严重程度.
对病毒性和病毒性分离物进行基因组分析,以确定遗传变异.
在毒性菌株中删除基因以确认毒性减弱.

主要成果:

所有测试的C. difficile分离物以类似的方式殖民小鼠,但表现出不同的疾病严重程度,从致命到恶性.
毒性分离物具有cdtR基因中的69个基对删除,该基因调节二进制毒素表达.
在一种毒性菌株中删除这种cdtR序列使其变得无毒,并降低了毒素基因转录.

结论:

在cdtR基因中的自然缺失减弱了C. difficile ST1的毒性,而不会影响殖民或持久性.
cdtR基因型可以区分毒性和毒性不良的C. difficile菌株.
识别cdtR变异可能会提高C. difficile结肠炎的诊断特异性.

关键词:

这是C. difficile.这是一个CDTCDT.CP: 微生物学微生物学 RT027一个人的生活 ST1ST1ST1ST1ST1ST1ST1ST1ST1ST1ST1ST1ST1ST1 这是一种二元毒素.临床分离物临床分离物预言预言预言预言有毒物质有毒物质的毒素.毒性毒性是一种毒性.

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