title: [Construction of infectious DNA clone of chimeric porcine circovirus type 1-2 and its immunogenicity in mice].
abstract: OBJECTIVE
  To construct infectious DNA clone of chimeric porcine circovirus type 1-2.
  
  
  METHODS
  Recombinant plasmid pSK-PCV1 delta ORF2-PCV2-ORF2 (pSK-sPCV1-2) was constructed by replacing the PCV1 capsid gene with that of PCV2 in the backbone recombinant containing the complete genomic DNA of PCV1. The full-length chimeric fragment PCV1-2 was excised from pSK-sPCV1-2 and cloned into the same recombinant to form the dimerized tandem DNA clone pSK-dPCV1-2.
  
  
  RESULTS
  The sequence of PCV1-2 infectious clone was confirmed by sequencing. PCV1-2 virus was observed to be infectious after transfecting into both PK-15 and Dulac cells. BALB/c mice were immunized with recombinant virus PCV1-2 and sera samples collected from all control and vaccinated animals at -1, 7, 14, 21, 28, 35, 42 day post-inoculation (dpi) were assayed for anti-PCV2 capsid antibodies by ELISA. The results indicated that the chimeric PCV1-2 virus with the immunogenic ORF2 capsid gene of pathogenic PCV2 cloned into the nonpathogenic PCV1 genomic backbone induced specific antibodies against the pathogenic PCV2 capsid antigen in almost all mice at 42 dpi.
  
  
  CONCLUSIONS
  PCV1-2 infectious clone was constructed, and the recombinant virus strain of PCV1-2 was of some immunogenicity.
authors.affiliation: Key Laboratory of Animal Infectious Disease, Ministry of Agriculture, Yangzhou University, Yangzhou 225009, China.
authors.forename: Song
authors.initials: S
authors.lastname: Yi
authors.forename: Zhu
authors.initials: Z
authors.lastname: Lina
authors.forename: Gao
authors.initials: G
authors.lastname: Song
authors.forename: Liu
authors.initials: L
authors.lastname: Xiufan
mesh_terms: D000818:Animals; D000914:Antibodies, Viral / Q000097:blood; D002678:Chimera / Q000235:genetics / Q000276:immunology; D018173:Circoviridae Infections / Q000276:immunology* / Q000662:veterinary* / Q000821:virology; D017925:Circovirus / Q000235:genetics* / Q000276:immunology*; D005818:Genetic Engineering; D007114:Immunization; D051379:Mice; D008807:Mice, Inbred BALB C; D053570:Porcine Postweaning Multisystemic Wasting Syndrome / Q000276:immunology* / Q000821:virology
chemical_list: D000914:Antibodies, Viral