[Show abstract][Hide abstract] ABSTRACT: Human adenovirus type 3 (HAdV-3) cause respiratory infections globally. There is no safe and efficient HAdV-3 vaccine thus far. In this report, a replication-defective human adenovirus type 3 was constructed by deletion of the whole E1 gene. A HEp-2 cell-based cell line designated HEp-2/E1 was generated and was shown to complement the function of E1 deleted mutant. A partial genome (9.5-100 mu) of HAdV-3 was cloned into pPolyII vector to be a backbone plasmid. A shuttle vector carrying eGFP gene was also constructed. The backbone and shuttle plasmids were co-transfected into the HEp-2/E1 cell line and 293 cell line separately. Typical cytopathic effect (CPE) appeared in the HEp-2/E1, but not in 293 cells 2 weeks after transfection. Wild-type HAdV-3 is neutralized by the sera from the mice immunized with the recombinant HAdV-3. The results demonstrated that the recombinant adenovirus type 3 may serve as a HAdV-3 vaccine candidate.
[Show abstract][Hide abstract] ABSTRACT: Human adenovirus type 3 (HAdV-3) is a causative agent of acute respiratory disease, which is prevalent throughout the world, especially in Asia. Here, the complete genome sequences of two field strains of HAdV-3 (strains GZ1 and GZ2) isolated from children with acute respiratory infection in southern China are reported (GenBank accession nos DQ099432 and DQ105654, respectively). The genomes were 35,273 bp (GZ1) and 35,269 bp (GZ2) and both had a G+C content of 51 mol%. They shared 99% nucleotide identity and the four early and five late regions that are characteristic of human adenoviruses. Thirty-nine protein- and two RNA-coding sequences were identified in the genome sequences of both strains. Protein pX had a predicted molecular mass of 8.3 kDa in strain GZ1; this was lower (7.6 kDa) in strain GZ2. Both strains contained 10 short inverted repeats, in addition to their inverted terminal repeats (111 bp). Comparative whole-genome analysis revealed 93 mismatches and four insertions/deletions between the two strains. Strain GZ1 infection produced a typical cytopathic effect, whereas strain GZ2 did not; non-synonymous substitutions in proteins of GZ2 may be responsible for this difference.
Journal of General Virology 07/2006; 87(Pt 6):1531-41. · 3.53 Impact Factor