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通过实验室化,Clostridium botulinum II组贝卢加菌株的基因组和表型多态性

Katja Selby¹, François P Douillard¹, Miia Lindström¹

¹Department of Food Hygiene and Environmental Health, Faculty of Veterinary Medicine, University of Helsinki, 00014 Helsinki, Finland.

International journal of food microbiology

|October 8, 2024

概括

实验室化导致Clostridium botulinum模型菌株Beluga因thyA基因突变而产生蒂米丁依赖. 这凸显了实验室菌株基因组监测的必要性,以确保食品安全研究的准确性.

科学领域:

微生物学微生物学
食品安全食品安全
分子生物学分子生物学

背景情况:

实验室化,涉及来自体外通道的遗传和生理变化,影响微生物模型菌株.
克洛斯特菌II组贝卢加是食品安全研究中广泛使用的模型菌株.
了解这些变化对于保持研究结果的完整性至关重要.

研究的目的:

为了研究实验室养对Clostridium botulinum Beluga菌株的影响.
在长期实验室培养的种群中识别遗传和生理变化.
评估这些改变对微生物食品安全研究的影响.

主要方法:

现型微阵列被用来识别营养素的辅助性.
在多个子库存上进行了全基因组重新测序 (WGS).
通过重新引入完整的thyA基因进行了补充研究.

主要成果:

在实验室进化的贝卢加种群中发现了提米丁辅助性.
全基因组重新测序揭示了在辅助性种群中的thyA基因 (编码thymidylate synthase) 中的一种特定的单核酸多态 (SNP).
补充剂恢复了原性,证实了thyA SNP是提米丁依赖的原因.

结论:

在Clostridium botulinum Beluga的实验室库存中维持了大约30年的时间,在thyA基因中发生了一种特定的突变,导致了提米丁辅食性变异.
这种在某些条件下可能有害的突变由于优化生长介质而未被检测到.
实验室菌株的定期表型和基因组监测对于防止研究数据完整性问题和确保准确的食品安全预测至关重要.

关键词:

适应适应适应肉毒主义 (botulism) 是一种疾病.挑战研究研究研究克洛斯特里迪亚姆肉毒 (Clostridium botulinum) 是一种植物.通过食物传播的病原体.基因稳定性基因稳定性实验室菌株试验室菌株整个基因组的测序.

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