近日,刊登在國際著名雜志PLoS Pathogens上的一篇研究報告“Control of Virulence by Small RNAs in Streptococcus pneumoniae”揭示了美國圣裘德兒童研究醫(yī)院研究人員的最新研究成果,,文章中,,研究者揭示了在肺炎鏈球菌中通過小RNA來控制細菌的毒力,。
世界范圍內,肺炎是兒童主要的致死原因,,引發(fā)肺炎的一個主要原因是患者感染了致病菌肺炎鏈球菌,,理解病原菌如何快速對宿主產生反應對于我們揭示其致病菌至關重要。
在真核生物和原核生物中,,小型非編碼的RNA(sRNAs)在調節(jié)基因表達方面扮演著非常重要的作用,。然而目前并沒有報道sRNA在影響肺炎鏈球菌上的作用,基于基因間隔區(qū)簽字啊的編碼能力,,研究者們假設肺炎球菌可以產生許多sRNA并且其在菌體的致病性上扮演著非常重要的作用,。
在研究報告中,研究者Jason W. Rosch說到,,他們使用了全基因組轉錄測序技術來系統(tǒng)性的識別發(fā)現(xiàn)肺炎鏈球菌(Streptococcus pneumoniae)的sRNAs,,使用這種技術,研究者發(fā)現(xiàn)了89個假設的sRNAs,,其中56個為新發(fā)現(xiàn)的,。通過深入研究,研究者運用定向基因操作技術和轉座突變的方法,,揭示了其中許多小RNA在影響細菌獨立上扮演著重要的角色,。研究數據為我們更好地理解肺炎鏈球菌中小RNA所扮演的角色和功能提供了基礎,而且研究者也是首次揭示了sRNA在肺炎鏈球菌中所發(fā)揮的功能,。(生物谷Bioon.com)
doi:10.1371/journal.ppat.1002788
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Control of Virulence by Small RNAs in Streptococcus pneumoniae
Beth Mann1#, Tim van Opijnen2#, Jianmin Wang3, Caroline Obert3, Yong-Dong Wang3, Robert Carter3, Daniel J. McGoldrick3, Granger Ridout3, Andrew Camilli4, Elaine I. Tuomanen1, Jason W. Rosch1*
Small noncoding RNAs (sRNAs) play important roles in gene regulation in both prokaryotes and eukaryotes. Thus far, no sRNA has been assigned a definitive role in virulence in the major human pathogen Streptococcus pneumoniae. Based on the potential coding capacity of intergenic regions, we hypothesized that the pneumococcus produces many sRNAs and that they would play an important role in pathogenesis. We describe the application of whole-genome transcriptional sequencing to systematically identify the sRNAs of Streptococcus pneumoniae. Using this approach, we have identified 89 putative sRNAs, 56 of which are newly identified. Furthermore, using targeted genetic approaches and Tn-seq transposon screening, we demonstrate that many of the identified sRNAs have important global and niche-specific roles in virulence. These data constitute the most comprehensive analysis of pneumococcal sRNAs and provide the first evidence of the extensive roles of sRNAs in pneumococcal pathogenesis.