无症状宿主中的适应性进化使MDR沙门氏菌具有增强的环境持久性和毒性
Bing He1, Ting-Ting Zhu1, Yin Liang1
1Guangdong Laboratory for Lingnan Modern Agriculture, National Risk Assessment Laboratory for Antimicrobial Resistance of Animal Original Bacteria, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, PR China; Guangdong Provincial Key Laboratory of Veterinary Pharmaceutics, Development and Safety Evaluation, South China Agricultural University, Guangzhou 510642, PR China.
The Science of the total environment
|November 6, 2023
概括
耐多药沙门氏菌通过适应性突变进化,在宿主中增强适应性和对环境压力因素的弹性. 这增加了其持久性和食物传播疾病传播的潜力,需要改进的控制策略.
科学领域:
- 微生物学 微生物学
- 食品安全 食品安全
- 进化生物学 进化生物学
背景情况:
- 沙门氏菌 spp. 沙门氏菌 是一种主要的食物传播疾病的原因,经常在牲畜中发现,并通过环境污染传播给人类.
- 越来越多的多药耐药 (MDR) 沙门氏菌的流行率构成了严重的公共卫生风险,需要了解其传播机制.
研究的目的:
- 调查导致MDR沙门氏菌在牲畜中的流行及其在环境中的传播的机制.
- 探索适应性进化如何影响沙门氏菌的适应性,持久性和病原性.
主要方法:
- 在中概述MDR沙门氏菌的殖民化动态.
- 对基因STM14_1829和氨基酸替代的作用进行机制研究.
- 评估已进化的沙门氏菌对环境压力因素 (热,寒,pH,氧化) 的弹性.
主要成果:
- 通过STM14_1829基因的突变发生的适应性进化,增加了宿主对MDR沙门氏菌的适应性.
- 通过调节鞭毛表达,单个氨基酸替代增强了沙门氏菌在细胞中的入侵和持久性.
- 进化的沙门氏菌对环境压力因素具有更强的弹性,这表明它们在受污染的环境中持久性更强.
- 进化促进了敏感宿主中的病原生,增加了传播风险.
结论:
- 在体内适应性进化通过鞭毛调节增加细菌耐受性来增强沙门氏菌的殖民,持久性和病原性.
- 这些发现解释了在牲畜和环境中特定的MDR沙门氏菌克隆的兴起.
- 需要先进的策略来控制这些动物传染病原体的进化.
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