title: Replacement of the replication factors of porcine circovirus (PCV) type 2 with those of PCV type 1 greatly enhances viral replication in vitro.
abstract: Porcine circovirus type 1 (PCV1), originally isolated as a contaminant of PK-15 cells, is nonpathogenic, whereas porcine circovirus type 2 (PCV2) causes an economically important disease in pigs. To determine the factors affecting virus replication, we constructed chimeric viruses by swapping open reading frame 1 (ORF1) (rep) or the origin of replication (Ori) between PCV1 and PCV2 and compared the replication efficiencies of the chimeric viruses in PK-15 cells. The results showed that the replication factors of PCV1 and PCV2 are fully exchangeable and, most importantly, that both the Ori and rep of PCV1 enhance the virus replication efficiencies of the chimeric viruses with the PCV2 backbone.
authors.affiliation: Department of Biomedical Sciences and Pathobiology, College of Veterinary Medicine, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061-0913, USA.
authors.forename: N M
authors.initials: NM
authors.lastname: Beach
authors.forename: N M
authors.initials: NM
authors.lastname: Juhan
authors.forename: L
authors.initials: L
authors.lastname: Cordoba
authors.forename: X J
authors.initials: XJ
authors.lastname: Meng
mesh_terms: D000818:Animals; D002460:Cell Line; D017925:Circovirus / Q000235:genetics / Q000502:physiology*; D004261:DNA Replication; D005818:Genetic Engineering; D016366:Open Reading Frames; D018741:Replication Origin; D013552:Swine; D014764:Viral Proteins / Q000235:genetics* / Q000378:metabolism; D014779:Virus Replication
chemical_list: D014764:Viral Proteins