Key result
Tongue epithelium cells from transgenic goats expressing 3D-7414shRNA showed a significant reduction in FMDV viral titres and copy numbers compared to non-transgenic goats, with inhibition rates up to 90.5% at 12 hours post-infection.
Why the study?
Does transgenic expression of 3D-7414shRNA targeting the FMDV-3Dpol gene reduce FMDV replication in goat tongue epithelium cells?
Does transgenic expression of 3D-7414shRNA targeting the FMDV-3Dpol gene reduce FMDV replication in goat tongue epithelium cells?
p-value: p=<0.05
Transgenic goats expressing shRNA targeting the FMDV 3Dpol gene demonstrate significant cellular resistance to foot-and-mouth disease virus infection.
Supports RNAi transgenesis for FMDV control in livestock; leaves open in vivo efficacy and field translation.
Foot and mouth disease induced by foot and mouth disease virus (FMDV) is severe threat to cloven-hoofed domestic animals. The gene 3Dpol in FMDV genome encodes the viral RNA polymerase, a vital element for FMDV replication. In this study, a conserved 3D-7414shRNA targeting FMDV-3Dpol gene was designed and injected into pronuclear embryos to produce the transgenic goats. Sixty-one goats were produced, of which, seven goats positively integrated 3D-7414shRNA. Loss of function assay demonstrated that siRNA effectively knockdown 3Dpol gene in skin epithelium cells of transgenic goats. Subsequently, the tongue epithelium cells from transgenic and non-transgenic goats were infected with FMDV O/YS/CHA/05 strain. A significant decrease of virus titres and virus copy number was observed in cells of transgenic goats compared with that of non-transgenic goats, which indicated that 3D-7414siRNA inhibited FMDV replication by interfering FMDV-3Dpol gene. Furthermore, we found that expression of TLR7, RIG-I and TRAF6 was lower in FMDV infected cells from transgenic goats compared to that from non-transgenic goats, which might result from lower virus copy number in transgenic goats' cells. In conclusion, we successfully produced transgenic goats highly expressing 3D-7414siRNA targeting 3Dpol gene, and the tongue epithelium cells from the transgenic goats showed effective resistance to FMDV.
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Li et al. (2015) studied Foot and mouth disease (n=61). 3D-7414shRNA transgenic expression vs. Non-transgenic goats was evaluated on Relative viral copy number and virus yield in tongue epithelium cells after FMDV challenge (p=<0.05). Tongue epithelium cells from transgenic goats expressing 3D-7414shRNA showed a significant reduction in FMDV viral titres and copy numbers compared to non-transgenic goats, with inhibition rates up to 90.5% at 12 hours post-infection.
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