Efficient construction of a recombinant adenovirus vector by an improved in vitro ligation method

Hum Gene Ther. 1998 Nov 20;9(17):2577-83. doi: 10.1089/hum.1998.9.17-2577.


An efficient method for constructing a recombinant adenovirus (Ad) vector, based on an in vitro ligation, has been developed. To insert the foreign gene into an adenoviral DNA, we introduced three unique restriction sites, I-CeuI, SwaI, and PI-SceI, into the E1 deletion site of the vector plasmid, which contains a complete E1, E3-deleted adenovirus type 5 genome. I-CeuI and PI-SceI are intron-encoded endonucleases with a sequence specificity of at least 9-10 and 11 bp, respectively. A shuttle plasmid, pHM3, containing multiple cloning sites between the I-CeuI and PI-SceI sites, was constructed. After the gene of interest was inserted into this shuttle plasmid, the plasmid for E1-deleted adenovirus vector could be easily prepared by in vitro ligation using the I-CeuI and PI-SceI sites. SwaI digestion of the ligation products prevented the production of a plasmid containing a parental adenovirus genome (null vector). After transformation into E. coli, more than 90% of the transformants had the correct insert. To make the vector, a PacI-digested, linearized plasmid was transfected into 293 cells, resulting in a homogeneous population of recombinant virus. The large number and strategic location of the unique restriction sites will not only increase the rapidity of production of new first-generation vectors for gene transfer but will allow for rapid further improvements in the vector DNA backbone.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Adenoviridae / genetics*
  • Base Sequence
  • Cell Line
  • DNA Primers
  • Genetic Vectors*
  • HeLa Cells
  • Humans
  • Plasmids
  • Recombination, Genetic*
  • Restriction Mapping
  • Sequence Deletion
  • alpha 1-Antitrypsin / genetics


  • DNA Primers
  • alpha 1-Antitrypsin