综合表型结合Salmonella Infantis及其H2S阴性变体的多种菌组 - 解决适应环境变化的适应机制
Victoria Drauch1, Nicola Palmieri1, Joachim Spergser2
1Clinic for Poultry and Fish Medicine, Department for Farm Animals and Veterinary Public Health, University of Veterinary Medicine Vienna, Veterinärplatz 1, 1210, Vienna, Austria.
Food microbiology
|March 14, 2025
概括
这项研究揭示了非典型的Salmonella Infantis变体 (ACV) 如何由于影响硫代谢和血清酶生物合成的突变而发展出H2S阴性表型. 这些适应性,包括对素的耐药性,有助于其生存和禽类潜在的免疫逃避.
科学领域:
- 食品微生物学 食品微生物学
- 基因组学就是基因组学.
- 病原体适应 病原体适应
背景情况:
- 沙门氏菌 (Salmonella Infantis,S. Infantis) 是一种新兴的动物传染病原体,在家禽中具有关键的检测需求.
- 现型变异,如H2S阴性殖民地变异 (ACV),可以逃避标准检测方法 (EN/ISO 6579-1:2017),增加食物传播疾病的风险.
- 了解这些变异对于有效的食品安全控制计划至关重要.
研究的目的:
- 调查从一家肉养殖场分离出的非典型的H2S阴性S. Infantis变体 (ACV) 的遗传和生化基础.
- 与其正常生长对应物 (NCP) 相比,分析ACV的稳定性,耐药性概况和代谢适应性.
- 阐明H2S阴性表型背后的分子机制以及对病原体持久性的潜在影响.
主要方法:
- 对正常 (NCP) 和非典型 (ACV) S. Infantis菌株的比较分析.
- 全基因组测序,转录组学和蛋白质组学,以确定遗传和分子差异.
- 稳定性测试,电子显微镜和表型表征,包括抗微生物耐药性分析 (cefoxitin).
- 功能网络分析,以探索代谢途径的适应性.
主要成果:
- 该ACV表现出稳定的表型变化,并获得了对素的耐药性.
- 基因组分析揭示了cysG (血清酶生物合成/硫代谢) 和menD (小殖民地变异的出现) 的突变.
- 在ACV中观察到替代代代谢途径 (酸盐,酸盐,混合酸发酵) 的补偿上调和降低的鞭毛蛋白表达.
结论:
- 假设cysG和menD中的突变会导致血红素缺乏和无氧硫呼吸缺陷,导致H2S阴性表型.
- 代谢适应和降低的鞭毛蛋白表达可能会增强ACV持久性,适应压力因素和免疫逃避.
- 这项研究为非典型的S. Infantis变种的出现和适应机制提供了关键的见解,影响了食品安全战略.
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