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Transcriptome studies on Streptococcus pneumoniae, illustration of early response genes to THP-1 human macrophages.

机译:肺炎链球菌的转录组研究,是对THP-1人巨噬细胞早期反应基因的例证。

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Pathogen-host interaction plays an essential role in pathogenicity. In this study, we investigated transcriptomes of one Streptococcus pneumoniae TIGR4-derived unencapsulated strain upon exposure to THP-1 human macrophage-like cells for 0.5 h, 1 h and 3 h, respectively. Expression of most genes was up-regulated and the changes of selected genes were validated by qRT-PCR. To characterize the functions of the identified genes, one locus of genes (SP1057-SP1063) was deleted in TIGR4 by insertion replacement mutagenesis. Compared to the wild-type strain, the constructed mutant exhibited lower binding and internalization activities to the THP-1 macrophages at early incubation time periods (0.5 h and/or 1 h) but not at 3 h. However, no change was observed in the intracellular survival assays. These data indicate that the SP1057-SP1063 locus is involved in the early stage of interaction with host macrophages. Further sequence and PCR analyses suggest that the SP1057-SP1063 locus was acquired by lateral transfer.
机译:病原体与宿主的相互作用在致病性中起着至关重要的作用。在这项研究中,我们分别研究了暴露于THP-1人巨噬细胞样细胞0.5 h,1 h和3 h的一种肺炎链球菌TIGR4来源的未封装菌株的转录组。大多数基因的表达上调并通过qRT-PCR验证所选基因的变化。为了表征已鉴定基因的功能,通过插入替换诱变在TIGR4中删除了一个基因座(SP1057-SP1063)。与野生型菌株相比,构建的突变体在早期温育时间段(0.5 h和/或1 h)而不是3 h表现出对THP-1巨噬细胞较低的结合和内化活性。但是,在细胞内存活测定中未观察到变化。这些数据表明SP1057-SP1063基因座参与与宿主巨噬细胞相互作用的早期阶段。进一步的序列和PCR分析表明,SP1057-SP1063基因座是通过横向转移获得的。

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