在肉生产中垂直转移的两个大肠杆菌克隆的起源和发展
Yufei Zhao1, Annet Heuvelink2, John Elmerdahl Olsen1
1Department of Veterinary and Animal Sciences, University of Copenhagen, Copenhagen, Denmark.
Microbial genomics
|November 28, 2025
概括
研究鸟类致病性大肠杆菌 (APEC) 克隆发现,等离子体和移动元素的变化,而不仅仅是核心基因组SNP,推动了进化. 这有助于追踪APEC克隆的起源,并改善家禽生产控制.
科学领域:
- 微生物学 微生物学
- 基因组学就是基因组学.
- 进化生物学 进化生物学
背景情况:
- 禽病原性大肠杆菌 (APEC) 的主导性,持久性克隆在家禽生产中带来了挑战.
- 了解APEC的克隆进化对于开发有效的控制策略至关重要.
研究的目的:
- 使用全基因组测序分析APEC的克隆性持久性和演变.
- 在垂直转移的APEC克隆中识别基因组变异.
- 开发一种方法来追踪APEC克隆的时间起源.
主要方法:
- 全基因组测序 (短读和长读的混合组合) 的APEC分离.
- 基因组变异的分析,包括等离子体,转移酶,菌素元素和核心基因组SNP (cgSNP).
- 对最近的共同祖先的突变率和时间的估计.
主要成果:
- 在APEC克隆中,基因组变异主要是由质粒和移动元素驱动的,超过了核心基因组SNP分歧.
- 估计的全基因组突变率为ST95-PFGE65的1.48个突变/基因组/年,ST131-PFGE47的2.86个突变/年.
- 最近的共同祖先可以追溯到2009年和2011年,直到2014-2015年采样才发生分歧.
结论:
- 这项研究引入了一种能够追踪APEC克隆的时间起源的方法.
- 等离子体增益/损失事件是APEC克隆进化的重要贡献者,通常被cgSNP值所忽视.
- 肉生产中的垂直传播涉及频繁的等离子体转移和在长时间内潜在的cgSNP积累.
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