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. 1984 Aug;51(2):329–339. doi: 10.1128/jvi.51.2.329-339.1984

Genetics of adeno-associated virus: isolation and preliminary characterization of adeno-associated virus type 2 mutants.

P L Hermonat, M A Labow, R Wright, K I Berns, N Muzyczka
PMCID: PMC254442  PMID: 6086948

Abstract

We constructed insertion and deletion mutants with mutations within the adeno-associated virus (AAV) sequences of the infectious recombinant plasmid pSM620. Studies of these mutants revealed at least three AAV phenotypes. Mutants with mutations between 11 and 42 map units were partially or completely defective for rescue and replication of the AAV sequences from the recombinant plasmids (rep mutants). The mutants could be complemented by mutants with replication-positive phenotypes. The protein(s) that is affected in rep mutants has not been identified, but the existence of the rep mutants proves that at least one AAV-coded protein is required for viral DNA replication. Also, the fact that one of the rep mutant mutations maps within the AAV intron suggests that the intron sequences code for part of a functional AAV protein. Mutants with mutations between 63 and 91 map units synthesized normal amounts of AAV duplex DNA but could not generate single-stranded virion DNA (cap mutants). The cap phenotype could be complemented by rep mutants and is probably due to a defect in the major AAV capsid protein, VP3. This suggests that a preformed capsid or precursor is required for the accumulation of single-stranded AAV progeny DNA. Mutants with mutations between 48 and 55 map units synthesized normal amounts of AAV single-stranded and duplex DNA but produced substantially lower yields of infectious virus particles than wild-type AAV (lip mutants). The lip phenotype is probably due to a defect in the minor capsid protein, VPI, and suggests the existence of an additional (as yet undiscovered) AAV mRNA. Evidence is also presented for recombination between mutant AAV genomes during lytic growth.

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Selected References

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