一个单个核酸多态性在Campylobacter jejuni的cysM中产生不同的转录配置文件
Nereus W Gunther Iv1, Siddhartha Kanrar1, Aisha Abdul-Wakeel1
1Characterization and Interventions for Foodborne Pathogens Research Unit, United States Department of Agriculture, Agricultural Research Service, Eastern Regional Research Center, Wyndmoor, PA, United States.
Frontiers in microbiology
|April 7, 2025
概括
在Campylobacter jejuni cysM未翻译区域 (UTR) 中的一种单核酸多态 (SNP) 影响基因转录. 关氨酸SNP增强了cysM和flaA的表达,促进了机动性,而腺氨酸SNP需要特定的条件来进行救援.
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:
- 坎皮洛巴克特 (Campylobacter jejuni) 是一种重要的食物传播病原体.
- 在*C. jejuni*中,基因调节对于它的生存和毒性至关重要.
- 未翻译区域 (UTR) 在控制基因表达方面发挥着至关重要的作用.
研究的目的:
- 研究单核酸多态 (SNP) 在 *Campylobacter jejuni* 的 *cysM* UTR 中对基因转录的影响.
- 确定这种SNP对基因表达和细菌运动性的功能影响.
主要方法:
- 在264个C. jejuni*菌株中*cysM* UTR的比较测序.
- 克隆不同UTR变异的上游记者基因 (*cysM*和*flaA*).
- 使用定量方法分析基因转录水平.
- 在*flaAB*无突变体中进行补充试验,以评估运动恢复.
主要成果:
- 在*cysM*翻译起点的上游20个核酸中,发现了一种SNP,其中219个菌株的关氨酸 (G) 和45个菌株的腺氨酸 (A).
- 带有关氨酸SNP的菌株表现出较高的*cysM*转录水平,与带有腺氨酸SNP的菌株相比.
- 克隆实验表明,与腺因SNP UTR相比,关氨酸SNP UTR显著增加了*flaA*转录.
- 关氨酸SNP UTR恢复了*flaAB*无突变体的运动性,而腺氨酸SNP UTR显示了延迟的救援,这取决于特定的生长条件,并可能影响到全长mRNA的产生.
结论:
- 在 *cysM* UTR 中识别的SNP显著影响 *C. jejuni* 中的基因转录水平.
- 关氨酸变体促进了更高的基因表达,并恢复了运动性,这表明它在像鞭毛状细胞这样的毒性因子中起着调节作用.
- 腺素变异对运动性的影响可能涉及mRNA生产的调节,突出显示了*C. jejuni*的复杂调节机制.
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