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. 1995 Nov;69(11):6627–6633. doi: 10.1128/jvi.69.11.6627-6633.1995

Constitutive episomal expression of polypeptide IX (pIX) in a 293-based cell line complements the deficiency of pIX mutant adenovirus type 5.

C Caravokyri 1, K N Leppard 1
PMCID: PMC189571  PMID: 7474071

Abstract

The human adenovirus type 5 capsid is composed of a number of distinct polypeptides. It has been shown previously that one of these, polypeptide IX (pIX), is not absolutely required for the production of viable virus. However, viruses lacking this polypeptide have a significantly reduced packaging limit and, in the one case studied, also show a thermolabile virion phenotype. This report describes the use of eukaryotic episomal vectors based on the Epstein-Barr virus replicon to generate cells which stably express pIX. These cells provide pIX that is efficiently incorporated into virions that are genetically pIX-; such enhanced thermostability. These cells have also been used to isolate a genetically pIX- virus having a genome of length some 2.3 kbp in excess of the previously defined packaging limit for pIX- virus; the resulting virions have wild-type thermostability. These cells expand the theoretical capacity of adenovirus vectors for foreign DNA to around 9.2 kbp and may therefore be useful in gene therapy applications in which vector capacity is limiting.

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Selected References

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