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一个罕见的 σ70 变异在大肠杆菌病原体 LF82 中建立了一个独特的基因表达模式

Melissa Arroyo-Mendoza^1,2, Alexandra Proctor², Abraham Correa-Medina¹

¹Gene Expression and Regulation Section, Laboratory of Biochemistry and Genetics, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, 8 Center Dr., Bethesda, MD, USA.

Nucleic acids research

|September 11, 2024

概括

埃舍里希亚大肠杆菌LF82中的一种罕见的遗传变化,这是一种与克罗恩病相关的细菌,增加了抗生素耐药性和生物膜形成. 在rpoD基因中这种单核酸多态性为病原生物进化提供了洞察力.

科学领域:

微生物学微生物学
遗传学遗传学是一个
分子生物学分子生物学

背景情况:

粘附性侵入性大肠杆菌 (AIEC) 病原生物与克罗恩病有关,但驱动它们独特表型的遗传因素尚不清楚.
了解AIEC病原生物出现的遗传基础对于阐明克罗恩病病因至关重要.

研究的目的:

识别将AIEC病原生物与其他大肠杆菌菌株区分开来的遗传变异.
研究LF82.2.的rpoD基因中特定单核酸多态 (SNP) 的功能影响.

主要方法:

RNA测序 (RNA-seq) 用于分析转录基因变化.
在体外转录试验测试以评估促进体活性.
对LF82和大肠杆菌K-12 MG1655菌株的比较分析.

主要成果:

在LF82的rpoD基因中发现了一种罕见的SNP (D445V).
这种SNP导致抗生素耐药性增加,生物膜形成和甲胺生物合成.
D445V变异直接增强特定基因的转录,受促进体元素的影响.

结论:

rpoD D445V SNP 是 LF82 AIEC 病原体的一个独特遗传特征.
这种SNP为病原生物的出现和适应提供了一个新的机制.
研究结果表明,特定遗传变异在炎症性肠病病原发生过程中的作用被低估了.

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