评估DNA修复缺陷的Listeria monocytogenes中的突变积累:在疫情分析中对cgMLST集群值的影响
Astrid Füszl1, Ariane Pietzka1, Patrick Hyden2
1National Reference Centre/Laboratory for Listeriosis, Austrian Agency for Health and Food Safety (AGES), Vienna/Graz, Austria.
Frontiers in cellular and infection microbiology
|March 4, 2025
概括
在Listeria monocytogenes中具有DNA修复缺陷的高突变率可能会错误地分类爆发菌株. 调整核心基因组多部位序列类型化 (cgMLST) 值可能会提高Listeria爆发检测的准确性.
科学领域:
- 微生物学 微生物学
- 基因组学就是基因组学.
- 流行病学 流行病学
背景情况:
- 李斯特菌 (Listeria monocytogenes) 是一种通过食物传播的病原体,导致严重感染的李斯特菌病.
- 全基因组测序 (WGS) 和核心基因组多部位测序类型 (cgMLST) 对于检测李斯特菌疫情至关重要.
- 精确的菌株鉴定依赖于cgMLST等位基因值.
研究的目的:
- 调查Listeria monocytogenes中的突变率,特别是在DNA修复缺陷的分离物中.
- 评估这些突变对基于cgMLST的疫情检测的影响.
主要方法:
- 一种缺乏DNA修复的Listeria monocytogenes分离物和野生类型控制物的连续亚培养.
- 使用全基因组测序 (WGS) 和核心基因组多部位序列类型 (cgMLST) 评估遗传变异性.
主要成果:
- 与野生类型对照相比,缺少DNA修复的分离体显示出明显更高的突变率.
- 突变率高超过标准cgMLST值,导致相关的李斯特菌株被错误分类为无关.
- 对奥地利李斯特菌数据库的分析表明,这种缺陷在隔离品中很少见.
结论:
- 标准的7元基因cgMLST值对于大多数Listeria爆发调查是有效的,但可能需要对超级突变菌株进行调整.
- 将DNA修复状态整合到分析中可以提高Listeria爆发调查的准确性.
- 改进的准确性确保了更可靠的公共卫生对食物传播疾病的反应.
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