title: Genetic manipulation of porcine epidemic diarrhoea virus recovered from a full-length infectious cDNA clone.
abstract: Porcine epidemic diarrhoea virus (PEDV) causes acute diarrhoea and dehydration in swine of all ages, with significant mortality in neonatal pigs. The recent rise of PEDV outbreaks in Asia and North America warrants an urgent search for effective vaccines. However, PEDV vaccine research has been hampered by difficulties in isolating and propagating the virus in mammalian cells, thereby complicating the recovery of infectious PEDV using a full-length infectious clone. Here, we engineered VeroE6 cells to stably express porcine aminopeptidase N (pAPN) and used them as a platform to obtain a high-growth variant of PEDV, termed PEDVAVCT12. Subsequently, the full-length cDNA clone was constructed by assembling contiguous cDNA fragments encompassing the complete genome of PEDVAVCT12 in a bacterial artificial chromosome. Infectious PEDV could be recovered, and the rescued virus displayed phenotypic properties identical to the parental virus. Interestingly, we found that PEDVAVCT12 contained a C-terminal deletion of the spike gene, resulting in disruption of the ORF3 start codon. When a functional ORF3 gene was restored, the recombinant virus could not be rescued, suggesting that ORF3 could suppress PEDV replication in vitro. In addition, a high-growth and genetically stable recombinant PEDV expressing a foreign protein could be rescued by replacing the ORF3 gene with the mCherry gene. Together, the results of this study provide a means to generate genetically defined PEDV as a promising vaccine candidate.
authors.affiliation: Virology and Cell Technology Laboratory, National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency (NSTDA), Pathumthani 12120, Thailand.
authors.forename: Juggragarn
authors.initials: J
authors.lastname: Jengarn
authors.affiliation: Virology and Cell Technology Laboratory, National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency (NSTDA), Pathumthani 12120, Thailand.
authors.forename: Phonphimon
authors.initials: P
authors.lastname: Wongthida
authors.affiliation: Virology and Cell Technology Laboratory, National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency (NSTDA), Pathumthani 12120, Thailand.
authors.forename: Nanchaya
authors.initials: N
authors.lastname: Wanasen
authors.affiliation: Virology and Cell Technology Laboratory, National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency (NSTDA), Pathumthani 12120, Thailand.
authors.forename: Phanramphoei Namprachan
authors.initials: PN
authors.lastname: Frantz
authors.affiliation: Virology and Cell Technology Laboratory, National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency (NSTDA), Pathumthani 12120, Thailand.
authors.forename: Asawin
authors.initials: A
authors.lastname: Wanitchang
authors.affiliation: Virology and Cell Technology Laboratory, National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency (NSTDA), Pathumthani 12120, Thailand.
authors.forename: Anan
authors.initials: A
authors.lastname: Jongkaewwattana
mesh_terms: D000818:Animals; D001483:Base Sequence; D002522:Chlorocebus aethiops; D018352:Coronavirus Infections / Q000662:veterinary* / Q000821:virology; D018076:DNA, Complementary / Q000235:genetics* / Q000378:metabolism; D004279:DNA, Viral / Q000235:genetics* / Q000378:metabolism; D003967:Diarrhea / Q000662:veterinary* / Q000821:virology; D016679:Genome, Viral; D008969:Molecular Sequence Data; D053485:Porcine epidemic diarrhea virus / Q000235:genetics* / Q000302:isolation & purification / Q000502:physiology; D013552:Swine; D013553:Swine Diseases / Q000821:virology*; D014709:Vero Cells
chemical_list: D018076:DNA, Complementary; D004279:DNA, Viral