An ArcA-Modulated Small RNA in Pathogenic Escherichia coli K1.

An ArcA-Modulated Small RNA in Pathogenic Escherichia coli K1.
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致病性大肠杆菌 K1 中 ArcA 调节的小 RNA

DOI:
10.3389/fmicb.2020.574833
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发表时间:
2020
影响因子:
5.2
通讯作者:
Feng L
Feng L
中科院分区:
生物学2区
文献类型:
--
作者:
Sun H;Song Y;Chen F;Zhou C;Liu P;Fan Y;Zheng Y;Wan X;Feng L

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大肠杆菌K1是新生儿脑膜炎的主要原因。了解E.大肠杆菌K1的致病性将有助于开发脑膜炎的治疗方法和预防神经系统后遗症。E.大肠杆菌K1在宿主血液中复制,形成高水平的菌血症,引起人类脑膜炎。然而,E. coli K1用来感受宿主血液中生存的小生境信号的机制尚不清楚。在E. coli K1基因组编码一种新的小RNA,sRNA-17。在微需氧血液中,ArcA下调sRNA-17的表达。ΔsRNA-17菌株在血液中的生长比野生型菌株更好,并且在人脑微血管内皮细胞中的侵袭频率增加。转录组分析显示,sRNA-17调节数十个差异表达的基因。这些数据表明,ArcA下调sRNA-17的表达,有利于细菌在血液中的存活和血脑屏障的穿透。我们的发现揭示了E. coli K1进行宿主适应性研究。
Escherichia coli K1 is the leading cause of meningitis in newborns. Understanding the molecular basis of E. coli K1 pathogenicity will help develop treatment of meningitis and prevent neurological sequelae. E. coli K1 replicates in host blood and forms a high level of bacteremia to cause meningitis in human. However, the mechanisms that E. coli K1 employs to sense niche signals for survival in host blood are poorly understood. We identified one intergenic region in E. coli K1 genome that encodes a novel small RNA, sRNA-17. The expression of sRNA-17 was downregulated by ArcA in microaerophilic blood. The ΔsRNA-17 strain grew better in blood than did the wild-type strain and enhanced invasion frequency in human brain microvascular endothelial cells. Transcriptome analyses revealed that sRNA-17 regulates tens of differentially expressed genes. These data indicate that ArcA downregulates the sRNA-17 expression to benefit bacterial survival in blood and penetration of the blood–brain barrier. Our findings reveal a signaling mechanism in E. coli K1 for host adaptation.
DOI: 10.1038/nmeth.1923
发表时间: 2012-03-04
期刊: NATURE METHODS
影响因子: 48
作者:
Langmead, Ben;Salzberg, Steven L.
通讯作者: Salzberg, Steven L.
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影响因子: 4.8
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