畜牧兽医学报 ›› 2015, Vol. 46 ›› Issue (8): 1409-1416.doi: 10.11843/j.issn.0366-6964.2015.08.017

• 预防兽医 • 上一篇    下一篇

非编码小RNA (RyhB)调控禽致病性大肠杆菌毒力相关基因的分析

尹磊,祁克宗*, 涂健,周秀红,刘红梅,王曼,张艳娜   

  1. (安徽农业大学动物科技学院,合肥 230036)
  • 收稿日期:2014-11-24 出版日期:2015-08-23 发布日期:2015-08-23
  • 通讯作者: 祁克宗,教授,E-mail:qkz@ahau.edu.cn
  • 作者简介:尹磊(1989-),男,安徽巢湖人,硕士,主要从事动物病理学研究,E-mail:ylshouhu1989@163.com
  • 基金资助:

    国家自然科学基金项目(31372402)

Analysis of the Regulation of Small Non-coding RNA (RyhB) on Avian Pathogenic Escherichia coli Virulence-related Genes

YIN Lei,QI Ke-zong*,TU Jian,ZHOU Xiu-hong,LIU Hong-mei,WANG Man,ZHANG Yan-na   

  1. (College of Animal Science and Technology,Anhui Agricultural University,Hefei 230036,China)
  • Received:2014-11-24 Online:2015-08-23 Published:2015-08-23

摘要:

以小RNA(RyhB)为研究对象,探索RyhB对禽致病性大肠杆菌相关毒力基因的调控研究。采用Red同源重组技术构建APEC野生株(AE17)RyhB的缺失株△RyhB以及构建出回复株△RyhB-comp。运用活菌计数法分别观察AE17、△RyhB、△RyhB-comp黏附鸡胚成纤维细胞DF-1的能力,并且利用Real-time PCR检测AE17、△RyhB和△RyhB-comp的 8个毒力基因转录水平。结果成功构建出了基因缺失株△RyhB和回复株△RyhB-comp,△RyhB黏附细胞能力较AE17均有显著地降低,约为AE17的62.5%,△RyhB-comp较△RyhB黏附能力显著上升,为△RyhB的1.4倍。同时,Real-time PCR结果显示,△RyhB的bcfAfyuAtshluxSfimCompA毒力基因的转录水平均极显著下降(P<0.01),其mRNA转录水平分别约为AE17的19%、52%、20%、14%、28%、52%;△RyhB的issibeA毒力基因表达水平分别上调约1.14倍和1.2倍。表明RyhB的缺失能够减弱APEC黏附DF-1的能力,并且使毒力基因的转录水平有所降低。根据以上结果,推测RyhB对APEC的毒力具有极其重要的调节作用。

Abstract:

Taking small RNA(RyhB)as the object of study,the experiment explored the regulation of RyhB on avian pathogenic Escherichia coli (APEC) virulence-related genes.The Red homologous recombination method was used to construct the RyhB gene deletion strain (△RyhB) and the complemented strain (△RyhB-comp) by transforming the fusion plasmid pSTV28-RyhB into △RyhB.Viable bacteria counting method was used to evaluate the effects of AE17,△RyhB and △RyhB-comp on the capability of APEC to adhere and invade DF-1 cell.Their effects on the mRNA levels of the eight virulence genes were analyzed by Real-time PCR.The results showed that APEC strains △RyhB and △RyhB-comp were constructed successfully.The adherence of △RyhB was decreased by 62.5% compared to AE17,and that of △RyhB-comp was increased about 1.4 folds compared to △RyhB.Real-time PCR revealed that the transcription of bcfA, fyuAtshluxSfimCompA genes of △RyhB were decreased by 19%,52%,20%,14%,28% and 52%,respectively;while the iss and ibeA genes were increased about 1.14 folds and 1.2 folds respectively.It showed that the deletion of RyhB can reduce the adhesive power of APEC to DF-1 cells and decrease the transcription of virulence genes.Our study demonstrates that RyhB plays a very important role in regulating the virulence of APEC.

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