通过全基因组测序和在 silico 多位置变量数组重复分析对 Clostridioides difficile 传播进行了增强的歧视
Alexander J Sundermann1,2,3, Emma G Mills2, Vatsala Rangachar Srinivasa1,3
1Microbial Genomic Epidemiology Laboratory, Center for Genomic Epidemiology, University of Pittsburgh, Pittsburgh, Pennsylvania, USA.
Microbiology spectrum
|October 27, 2025
概括
全基因组测序 (WGS) 努力区分密切相关的Clostridioides difficile菌株. 将WGS与in silico多位置变量数并列重复分析 (MLVA) 结合起来,可以改善遗传歧视,增强与医疗相关的感染爆发调查.
科学领域:
- 微生物学 微生物学
- 基因组学就是基因组学.
- 传染病流行病学 传染病流行病学
背景情况:
- 全基因组测序 (WGS) 对于跟踪医疗保健环境中的细菌感染和疫情至关重要.
- 对于密切相关的Clostridioides difficile菌株,WGS往往缺乏足够的区分能力,阻碍了准确的传播推断.
- 多位点变量数并列重复分析 (MLVA) 针对快速突变的位点,并显示出对C. difficile类型的承诺.
研究的目的:
- 评估in silico MLVA在增强由WGS.识别的C. difficile集群的遗传相关性解决中的实用性.
- 确定是否将短读WGS与基于纳米孔的MLVA结合起来可以改善在医疗保健相关的C. difficile感染中的流行病学联系的识别.
主要方法:
- 从2016年11月到2019年11月收集的与医疗保健相关的毒素阳性C. difficile分离物.
- 执行了短读WGS以集群分离物与≤2个单核酸多态 (SNP) 差异.
- 采用纳米孔长读序列测序用于集群分离物的 in silico MLVA 分析,以计算总和串联重复差异 (STRD).
主要成果:
- 在666个分离物中,有62个符合≤2 SNP标准,并进行了MLVA分析.
- 在105对0-2SNP差异的对中,79%的人表现出0-5的STRD.
- 一个较低的STRD与基于单位/程序的流行病学联系显著相关 (OR:0.45;95%CI:0.29-0.70).
结论:
- In silico MLVA为通过WGS.确定的密切相关的C. difficile分离物提供了额外的基因组歧视.
- 结合WGS和MLVA可以提高与医疗相关的疫情调查的准确性.
- 这种综合测序策略可以有效地解决单独WGS在C. difficile.常规医院监测中的局限性.
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