title: Genomic sequence and virulence of clonal isolates of vaccinia virus Tiantan, the Chinese smallpox vaccine strain.
abstract: Despite the worldwide eradication of smallpox in 1979, the potential bioterrorism threat from variola virus and the ongoing use of vaccinia virus (VACV) as a vector for vaccine development argue for continued research on VACV. In China, the VACV Tiantan strain (TT) was used in the smallpox eradication campaign. Its progeny strain is currently being used to develop a human immunodeficiency virus (HIV) vaccine. Here we sequenced the full genomes of five TT clones isolated by plaque purification from the TT (752-1) viral stock. Phylogenetic analysis with other commonly used VACV strains showed that TT (752-1) and its clones clustered and exhibited higher sequence diversity than that found in Dryvax clones. The ∼190 kbp genomes of TT appeared to encode 273 open reading frames (ORFs). ORFs located in the middle of the genome were more conserved than those located at the two termini, where many virulence and immunomodulation associated genes reside. Several patterns of nucleotide changes including point mutations, insertions and deletions were identified. The polymorphisms in seven virulence-associated proteins and six immunomodulation-related proteins were analyzed. We also investigated the neuro- and skin- virulence of TT clones in mice and rabbits, respectively. The TT clones exhibited significantly less virulence than the New York City Board of Health (NYCBH) strain, as evidenced by less extensive weight loss and morbidity in mice as well as produced smaller skin lesions and lower incidence of putrescence in rabbits. The complete genome sequences, ORF annotations, and phenotypic diversity yielded from this study aid our understanding of the Chinese historic TT strain and are useful for HIV vaccine projects employing TT as a vector.
authors.affiliation: State Key Laboratory for Infectious Disease Prevention and Control, National Center for AIDS/STD Control and Prevention (NCAIDS), Chinese Center for Disease Control and Prevention, Beijing, China.
authors.forename: Qicheng
authors.initials: Q
authors.lastname: Zhang
authors.forename: Meijuan
authors.initials: M
authors.lastname: Tian
authors.forename: Yi
authors.initials: Y
authors.lastname: Feng
authors.forename: Kai
authors.initials: K
authors.lastname: Zhao
authors.forename: Jing
authors.initials: J
authors.lastname: Xu
authors.forename: Ying
authors.initials: Y
authors.lastname: Liu
authors.forename: Yiming
authors.initials: Y
authors.lastname: Shao
mesh_terms: D000818:Animals; D001483:Base Sequence; D004195:Disease Models, Animal; D005260:Female; D016679:Genome, Viral / Q000235:genetics*; D006801:Humans; D056747:Immunomodulation / Q000235:genetics; D051379:Mice; D008807:Mice, Inbred BALB C; D058977:Molecular Sequence Annotation; D008969:Molecular Sequence Data; D009154:Mutation / Q000235:genetics; D009420:Nervous System / Q000473:pathology / Q000821:virology; D016366:Open Reading Frames / Q000235:genetics; D010802:Phylogeny; D011110:Polymorphism, Genetic; D011817:Rabbits; D012867:Skin / Q000473:pathology / Q000821:virology; D012900:Smallpox Vaccine / Q000235:genetics* / Q000276:immunology*; D014616:Vaccinia virus / Q000235:genetics* / Q000302:isolation & purification / Q000472:pathogenicity*; D014764:Viral Proteins / Q000235:genetics / Q000378:metabolism; D014774:Virulence / Q000235:genetics
chemical_list: D012900:Smallpox Vaccine; D014764:Viral Proteins