相关实验视频
Updated: Jun 23, 2026
09:01
Chronic Salmonella Infected Mouse Model
Published on: May 31, 2010
17.3K
从急性感染到持久性感染:揭示沙门氏菌阿戈纳菌的基因组变异
Emma V Waters1,2, Winnie W Y Lee1,3, Amina Ismail Ahmed4
1Microbes and Food Safety, Quadram Institute Bioscience, Norwich, United Kingdom.
PLoS pathogens
|October 31, 2024
概括
沙门氏菌 (Salmonella Agona) 可以在人体中持续存在,可能导致慢性携带. 在感染期间基因组和SNP变异增加,可能有助于免疫逃避长期持久性.
科学领域:
- 微生物学 微生物学
- 传染性疾病 传染性疾病
- 基因组学就是基因组学.
背景情况:
- 沙门氏菌 (Salmonella enterica serovar Agona) 是胃肠炎的一个重要原因.
- S. Agona表现出强烈的生物膜形成,可以进入一个可行的但不可培养的状态,类似于S. Typhi在慢性携带方面的策略.
研究的目的:
- 调查S. Agona在人类中的持久性,并确定导致慢性携带的因素.
- 为了比较急性和持续性S. Agona感染的基因组和表型特征.
主要方法:
- 分析了2233个来自英国感染的S. Agona分离物 (2004-2020年).
- 207个分离物的短读和长读测序用于基因组结构 (GS) 分析.
- 表型分析包括碳源利用和生物膜形成.
主要成果:
- 在195个分离物体中发现了一个保存的基因组结构 (GS1.0),在12个分离物体中发现了8个额外的GS.
- 重组的隔离物与早期康复者携带 (3周-3个月) 有关.
- 在此期间观察到单核酸多态 (SNP) 变异的增加.
结论:
- 在S. Agona的基因组规模和SNP变异可能反映了急性感染后的人口扩张.
- 这种变异可能代表一种免疫逃避机制,促进持续的S. Agona感染和慢性携带.
相关概念视频
01:26Stages of Infection
Stages of infection describe what happens to a susceptible host once a pathogen invades the human body. The stages of infection are incubation, prodromal, illness, stage of decline, and convalescence. The incubation stage is the period from exposure to a pathogen until symptoms start. The infected person is unaware of impending illness as the pathogens grow and multiply within the body. The duration may vary depending on the type of infection. The incubation period of measles averages ten to...
01:08Evolution of Microbial Genome
Microbial genome evolution is a highly dynamic process shaped by continual gene gain and loss across species and strains. This genomic flexibility allows microorganisms to adapt rapidly to environmental pressures and interactions with other organisms. Central to understanding this diversity is the distinction between the core and pan genomes.The core genome comprises the genes shared by all sampled strains of a species, representing essential functions needed for fundamental cellular processes.