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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1981 Apr;78(4):2184–2188. doi: 10.1073/pnas.78.4.2184

Method for introducing site-specific mutations into adenovirus 2 genome: construction of a small deletion mutant in VA-RNAI gene.

Q S Kapoor, G Chinnadurai
PMCID: PMC319308  PMID: 6941277

Abstract

We have developed a method for introducing mutations into the adenovirus type 2 genome at predetermined sites. Specific mutations are introduced into segments of the viral genome cloned in bacteria by using plasmid vectors. The chimeric DNA is used to construct viral mutants by cotransfection with two viral DNA segments derived from both ends of the viral genome, each of which has overlapping sequence homology with the cloned viral DNA segment. To illustrate this procedure, we cloned a large restriction fragment [EcoRI fragment A, map position (mp) 0--58.5] by using plasmid vector pBR322, and a small deletion mutation was introduced at the BamHI cleavage site located within the VA-RNAI gene (mp 29 at residue +75 on VA-RNAI gene). The mutated DNA was then used to construct viral mutants by cotransfection into human cells with the adenovirus type 2 DNA--protein complex digested with Sal I. In vivo recombination occurred via overlapping sequences between the cloned EcoRI fragment A and Sal I-digested DNA--protein complex at two sites, mp 0--25 (i.e., within Sal I fragment B) and mp 45--58.5 (i.e., overlapping sequences between Sal I fragment A and EcoRI fragment A), generating infectious DNA molecules with intact ends. The viral mutant grows as well as the wild type in KB cells and induces the synthesis of smaller VA-RNAI but normal-size VA-RNAII.

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Selected References

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