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. 1995 Oct;69(10):6518–6524. doi: 10.1128/jvi.69.10.6518-6524.1995

Lack of evidence of phenotypic complementation of E1A/E1B-deleted adenovirus type 5 upon superinfection by wild-type virus in the cotton rat.

W Oualikene 1, P Gonin 1, M Eloit 1
PMCID: PMC189553  PMID: 7666553

Abstract

The safety of replication-defective viruses used as vectors is based on the deletion of essential gene(s). Adenovirus vector safety relies on the deletion of the E1A/E1B region. This region encodes the immediate-early proteins that trans activate all other early regions, so DNA replication in these deletion mutants is dramatically reduced. We have previously shown that E1A deletion is efficient in vivo and significantly reduces the dissemination of adenovirus in mice and cotton rats. However, the pattern of dissemination of E1A-deleted and wild-type viruses showed that both could be localized in the same tissues, thus involving a theoretical risk of phenotypic complementation if a recipient of E1A-deleted adenovirus is infected after adenovirus-mediated gene therapy by a wild-type adenovirus. In this report, we show that complementation can be evidenced in vitro in Vero cells infected with E1A/E1B-defective adenovirus vectors expressing reporter genes (either beta-galactosidase or luciferase), passaged three times until no infectious virus can be recovered by plating on 293 cells, and then infected with wild-type adenovirus 5. A mixed virus population was maintained at a stable state for at least 10 passages. In contrast, no evidence of complementation was found in cotton rats inoculated intravenously or intramuscularly with Ad-beta-gal-nls and Ad-luc and infected 24 h later intranasally with wild-type adenovirus 5. No increase in the level of luciferase expression was found in these animals, compared with that in controls, nor was any viral population expressing beta-galactosidase or luciferase isolated from various organs or any animal excretion or secretion.

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Selected References

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