在大肠杆菌基因型中papA和papG变体的分布:与主要肠外病原性血统的关联
Valentina Fernández-Yáñez1,2, Patricio Suazo2, Claudia Hormazábal1,2
1Departamento de Biología, Facultad de Química y Biología, Universidad de Santiago de Chile, Av. Libertador Bernardo O'Higgins 3363, Santiago 9170022, Chile.
International journal of molecular sciences
|June 27, 2024
概括
这项研究绘制了P fimbria变体 (papA和papG) 在肠外致病菌大肠杆菌 (ExPEC) 中的分布图. 常见变异与特定的ExPEC基因型相关,并且在人类和动物菌株中发现,这表明交叉传播.
科学领域:
- 微生物学 微生物学
- 基因组学就是基因组学.
- 病原体的进化 病原体的进化
背景情况:
- 发炎相关的膜体 (P膜体) 是肠外致病菌大肠杆菌 (ExPEC) 的关键粘附因子.
- 虽然存在大量的papA和papG基因变异,但它们在多种ExPEC菌株中的分布仍然不完全理解.
- 了解这种分布对于阐明ExPEC致病机制和跟踪临床相关ExPEC血统的演变至关重要.
研究的目的:
- 在ExPEC基因型的多样性中全面地绘制papA和papG变异的分布.
- 为了确定特定的P fimbria变体与流行的ExPEC族群和序列类型之间的关联.
- 调查这些变异在人类和动物来源的菌株以及智利尿病原菌大肠杆菌的特定队列中存在的情况.
主要方法:
- 一项大规模的描述性研究,分析来自NCBI大会Refseq数据库的基因组序列.
- 在各种大肠杆菌基因型中检测和描述papA和papG变体.
- 对来自智利泌尿病原性大肠杆菌菌株的17个基因组进行分析,以确定变体分布和关联.
主要成果:
- 常见的papA变体 (F11,F10,F48,F16,F12,F7-2) 和papG变体 (papGII,papGIII) 与主要的ExPEC基因型 (基因组B2,D;STs 95,131,127,69,12,73) 有显著的关联.
- 一些菌株,特别是ST12,存在多个papA和papG变体. 这些变异还在来自人类和动物 (家禽,牛,狗) 的菌株中发现.
- 在智利的泌尿病原性大肠杆菌中,ST12和ST73占主导地位,检测到的papA和papG变体显示出与序列类型的显著关联,反映了更广泛的数据库中的发现.
结论:
- 本研究提供了ExPEC中P fimbria变异分布的全面景观,突出了与毒性基因型的关键关联.
- 这些发现支持P fimbria变异在ExPEC致病性中的作用,并表明人类和动物之间的潜在交叉传播.
- 详细的表征有助于将来研究P fimbria介导的粘附性,并为ExPEC类型和流行病监测提供基础.
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