title: Genome cloning and analysis of the large RNA segment (segment A) of a naturally avirulent serotype 2 infectious bursal disease virus.
abstract: The genome of infectious bursal disease virus (IBDV) of serotype 2 (strain OH) has been cloned, and 3171 nucleotides of genome segment A cDNA sequence have been determined for the first time. Sequence homology of OH-IBDV with the most distant serotype 1 IBDV at the nucleotide level is 83.1%, and the amino acid sequence homology of the polyprotein is 89.6%. Alignment of the polyprotein amino acid sequences showed the hypervariable region in VP2 to be 151-152 amino acid residues long in IBDV. A second variable region, 37 amino acid residues long, was identified in the N-terminal third of the IBDV VP2 molecule. IBDV strains, like the IPNV strains, also contain inverted repeats that may form stem-and-loop structures in the 5' noncoding sequences. These inverted repeats are variable between the two IBDV serotypes, particularly at the AT basepairs.
authors.affiliation: Department of Pathology and Microbiology, Atlantic Veterinary College, University of Prince Edward Island, Charlottetown, P.E.I., Canada.
authors.forename: F S
authors.initials: FS
authors.lastname: Kibenge
authors.forename: P K
authors.initials: PK
authors.lastname: McKenna
authors.forename: J K
authors.initials: JK
authors.lastname: Dybing
mesh_terms: D000818:Animals; D001483:Base Sequence; D002645:Chickens; D003001:Cloning, Molecular / Q000379:methods; D004926:Escherichia coli / Q000235:genetics; D005814:Genes, Viral; D007243:Infectious bursal disease virus / Q000145:classification / Q000235:genetics* / Q000472:pathogenicity; D008969:Molecular Sequence Data; D009690:Nucleic Acid Conformation; D016366:Open Reading Frames; D012367:RNA, Viral / Q000235:genetics*; D012689:Sequence Homology, Nucleic Acid; D012703:Serotyping; D014774:Virulence
chemical_list: D012367:RNA, Viral