ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2015, Vol. 46 ›› Issue (8): 1409-1416.doi: 10.11843/j.issn.0366-6964.2015.08.017

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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

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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