RNAi combining Sleeping Beauty transposon system inhibits ex vivo expression of foot-and-mouth disease virus VP1 in transgenic sheep cells

Sci Rep. 2017 Aug 30;7(1):10065. doi: 10.1038/s41598-017-09302-1.

Abstract

Foot and mouth disease, which is induced by the foot and mouth disease virus (FMDV), takes its toll on the cloven-hoofed domestic animals. The VP1 gene in FMDV genome encodes the viral capsid, a vital element for FMDV replication. Sleeping Beauty (SB) is an active DNA-transposon system responsible for genetic transformation and insertional mutagenesis in vertebrates. In this study, a conserved VP1-shRNA which specifically targets the ovine FMDV-VP1 gene was constructed and combined with SB transposase and transposon. Then, they were microinjected into pronuclear embryos to breed transgenic sheep. Ninety-two lambs were born and the VP1-shRNA was positively integrated into eight of them. The rate of transgenic sheep production in SB transposon system was significantly higher than that in controls (13.04% vs. 3.57% and 7.14%, P < 0.05). The ear fibroblasts of the transgenic lambs transfected with the PsiCheck2-VP1 vector had a significant inhibitory effect on the VP1 gene of the FMDV. In conclusion, the VP1-shRNA transgenic sheep were successfully generated by the current new method. The ear fibroblasts from these transgenic sheep possess a great resistance to FMDV. The result indicated that RNAi technology combining the "Sleeping Beauty" transposon system is an efficient method to produce transgenic animals.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Animals, Genetically Modified*
  • Capsid Proteins / antagonists & inhibitors
  • Capsid Proteins / genetics*
  • Capsid Proteins / metabolism
  • DNA Transposable Elements*
  • Ear
  • Embryo, Mammalian
  • Fibroblasts / cytology
  • Fibroblasts / immunology
  • Foot-and-Mouth Disease / genetics*
  • Foot-and-Mouth Disease / immunology
  • Foot-and-Mouth Disease / prevention & control
  • Foot-and-Mouth Disease / virology
  • Foot-and-Mouth Disease Virus / genetics
  • Foot-and-Mouth Disease Virus / pathogenicity
  • Gene Expression Regulation
  • Genes, Reporter
  • Genetic Engineering / methods
  • Luciferases / genetics
  • Luciferases / metabolism
  • RNA, Small Interfering / genetics*
  • RNA, Small Interfering / metabolism
  • Sheep
  • Transposases / genetics
  • Transposases / metabolism

Substances

  • Capsid Proteins
  • DNA Transposable Elements
  • RNA, Small Interfering
  • VP1 protein, Foot-and-mouth disease virus
  • Luciferases
  • Transposases