title: Efficient rescue of infectious bursal disease virus from cloned cDNA: evidence for involvement of the 3'-terminal sequence in genome replication.
abstract: To study the mechanism of replication of infectious bursal disease virus (IBDV), and to determine factors on the IBDV RNA which are involved in viral replication, we used cloned full-length cDNA of both the A- and B-segments to generate infectious IBDV. Infectious IBDV was rescued from plasmids that contained full-length IBDV cDNA behind a T7 promoter, by transfecting these plasmids into cells which were infected with a recombinant Fowlpox virus that expressed T7 RNA polymerase. By using the cDNA transfection system we evaluated the effect of the length of the 3' terminus of the A-segment plus strand of IBDV. Although wild-type IBDV predominantly contains four cytosines at the 3' terminus, no difference in virus yield was found when virus was rescued from cDNAs containing three to six adjacent cytosines. When the 3' terminus was shorter than three cytosines the efficiency to generate infectious IBDV from cDNA was reduced, but IBDV could still be recovered reproducibly. The rescued viruses from cDNAs containing 3'-terminal deletions appeared to have a restored 3'-terminal sequence. The missing nucleotides are probably restored by using complementary bases of a stem-loop structure as template.
authors.affiliation: Department of Avian Virology, Institute for Animal Science and Health, Lelystad, The Netherlands. H.J.Boot@ID.wag-ur.nl
authors.forename: H J
authors.initials: HJ
authors.lastname: Boot
authors.forename: A A
authors.initials: AA
authors.lastname: ter Huurne
authors.forename: B P
authors.initials: BP
authors.lastname: Peeters
authors.forename: A L
authors.initials: AL
authors.lastname: Gielkens
mesh_terms: D000818:Animals; D001483:Base Sequence; D002460:Cell Line; D002642:Chick Embryo; D003001:Cloning, Molecular; D004279:DNA, Viral; D012321:DNA-Directed RNA Polymerases / Q000235:genetics; D005587:Fowlpox virus / Q000235:genetics; D015870:Gene Expression; D005822:Genetic Vectors; D016679:Genome, Viral; D003698:Hepatitis Delta Virus / Q000201:enzymology; D007243:Infectious bursal disease virus / Q000235:genetics* / Q000502:physiology; D008969:Molecular Sequence Data; D016296:Mutagenesis; D009690:Nucleic Acid Conformation; D010957:Plasmids; D016337:RNA, Catalytic / Q000235:genetics; D012330:RNA, Double-Stranded / Q000096:biosynthesis; D012367:RNA, Viral / Q000096:biosynthesis / Q000502:physiology*; D017423:Sequence Analysis, RNA; D014764:Viral Proteins; D014779:Virus Replication
chemical_list: D004279:DNA, Viral; D016337:RNA, Catalytic; D012330:RNA, Double-Stranded; D012367:RNA, Viral; D014764:Viral Proteins; C062210:bacteriophage T7 RNA polymerase; D012321:DNA-Directed RNA Polymerases