对Pseudomonas syringae-phage相互作用的同进化分析,以帮助合理设计菌体治疗方法
Mojgan Rabiey1,2, Emily R Grace2, Paulina Pawlos2
1School of Life Sciences, Gibbet Hill Campus, University of Warwick, Coventry, UK.
Microbial biotechnology
|June 12, 2024
概括
像Pseudomonas syringae syringae这样的细菌病原体可以快速发展出对菌体的耐药性,即使使用菌体尾酒. 了解这些抵抗机制,主要是通过脂多糖路径的修改,是开发有效的菌体生物控制策略的关键.
科学领域:
- 植物病理学 植物病理学
- 微生物学 微生物学
- 遗传学 遗传学 是一个
背景情况:
- 由于抗微生物选择有限,治疗细菌性植物病具有挑战性.
- 伪虫 (Pseudomonas syringae pathovar syringae (Pss)) 对桃树造成重大损害,影响农业生产率.
- 菌体 (菌体) 正在被探索作为对PSS的生物控制策略,但它们的有效性和对细菌耐药性的潜力需要研究.
研究的目的:
- 评估菌体在减少Pss种群中的有效性.
- 调查对菌体耐药性的Pss进化机制和速度.
- 了解菌体暴露后Pss种群的基因组和健康变化.
主要方法:
- 使用5种MR菌体对抗Pss.进行了杀死曲线试验.
- 在杀死曲线试验中收集了pss殖民地进行分析.
- 在10代的时间里,Pss和菌体共同进化,以测量基因组和健康变化.
- 基因组分析的重点是确定脂多糖 (LPS) 合成途径的变化.
主要成果:
- 在实验室中,Pss迅速发展出对菌体的耐药性,即使使用菌体尾酒.
- 确定LPS合成途径是Pss抗性演变的主要目标.
- 在大多数耐药突变种中,细菌适应性和毒性受到最小的影响.
- 后来几代共同进化的菌体在减少细菌密度和缓解耐药性的出现方面更有效.
结论:
- 细菌病原体可以很快发展出对菌体的耐药性,因此需要对潜在的遗传机制有充分的了解.
- 准LPS途径对于开发有效的菌体生物控制策略对Pss.至关重要.
- 优化菌体尾酒和利用进化的菌体可以帮助克服耐药性并提高生物控制的有效性.
相关概念视频
01:30Lytic Cycle of Bacteriophages
70.6K
Bacteriophages, also known as phages, are specialized viruses that infect bacteria. A key characteristic of phages is their distinctive “head-tail” morphology. A phage begins the infection process (i.e., lytic cycle) by attaching to the outside of a bacterial cell. Attachment is accomplished via proteins in the phage tail that bind to specific receptor proteins on the outer surface of the bacterium. The tail injects the phage’s DNA genome into the bacterial cytoplasm. In the...
70.6K
00:43Lysogenic Cycle of Bacteriophages
62.1K
In contrast to the lytic cycle, phages infecting bacteria via the lysogenic cycle do not immediately kill their host cell. Instead, they combine their genome with the host genome, allowing the bacteria to replicate the phage DNA along with the bacterial genome. The incorporated copy of the phage genome is called the prophage. Some prophages can re-activate and enter the lytic cycle. This often occurs in response to a perturbation, such as DNA damage, but can also transpire in the absence of...
62.1K
02:53CRISPR and crRNAs
17.0K
Bacteria and archaea are susceptible to viral infections just like eukaryotes; therefore, they have developed a unique adaptive immune system to protect themselves. Clustered regularly interspaced short palindromic repeats and CRISPR-associated proteins (CRISPR-Cas) are present in more than 45% of known bacteria and 90% of known archaea.
The CRISPR-Cas system stores a copy of foreign DNA in the host genome and uses it to identify the foreign DNA upon reinfection. CRISPR-Cas has three different...
The CRISPR-Cas system stores a copy of foreign DNA in the host genome and uses it to identify the foreign DNA upon reinfection. CRISPR-Cas has three different...
17.0K
00:57Antibiotic Selection
53.1K
Overview
53.1K