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. 1982 Mar;41(3):868–876. doi: 10.1128/jvi.41.3.868-876.1982

Effect of deletions in adenovirus early region 1 genes upon replication of adeno-associated virus.

C A Laughlin, N Jones, B J Carter
PMCID: PMC256823  PMID: 6284977

Abstract

The growth of adeno-associated virus (AAV) is dependent upon helper functions provided by adenovirus. We investigated the role of adenovirus early gene region 1 in the AAV helper function by using six adenovirus type 5 (Ad5) host range mutants having deletions in early region 1. These mutants do not grow in human KB cells but are complemented by and grow in a line of adenovirus-transformed human embryonic kidney cells (293 cells); 293 cells contain and express the Ad5 early region 1 genes. Mutants having extensive deletions of adenovirus early region 1a (dl312) or regions 1a and 1b (dl313) helped AAV as efficiently as wild-type adenovirus in 293 cells, but neither mutant helped in KB cells. No AAV DNA, RNA, or protein synthesis was detected in KB cells in the presence of the mutant adenoviruses. Quantitative blotting experiments showed that at 20 h after infection with AAV and either dl312 or dl313 there was less than one AAV genome per cell. In KB cells infected with AAV alone, the unreplicated AAV genomes were detected readily. Apparently, infection with adenovirus mutant dl312 or dl313 results in degradation of most of the infecting AAV genomes. We suggest that at least an adenovirus region 1b product (and perhaps a region 1a product also) is required for AAV DNA replication. This putative region 1b function appears to protect AAV DNA from degradation by an adenovirus-induced DNase. We also tested additional Ad5 mutants (dl311, dl314, sub315, and sub316). All of these mutants were inefficient helpers, and they showed varying degrees of multiplicity leakiness. dl312 and dl313 complemented each other for the AAV helper function, and each was complemented by Ad5ts125 at the nonpermissive temperature. The defect in region 1 mutants for AAV helper function acts at a different stage of the AAV growth cycle than the defect in the region 2 mutant ts125.

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Selected References

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