1887

Abstract

SUMMARY

Human adenovirus (Ad) serotypes provide an early factor(s) that is necessary for adenovirus-associated virus (AAV) multiplication in human cell lines. However, little, if any, AAV production occurs in primary African green monkey kidney (AGMK) cells co-infected with AAV and a helper human Ad (non-permissive infection), unless cells are additionally infected with SV40 (permissive infection). To determine the basis of the host restriction of AAV replication in AGMK cells, AAV DNA, RNA and protein synthesis were analysed under various conditions of infection. Hybridization reactions revealed no detectable AAV-specific DNA or RNA in infections with AAV alone or in combination with SV40. In co-infections with AAV and Ad5 or Ad7, the synthesis of both AAV- and Ad-specific DNA and RNA occurred without a significant rise in titre of either virus. During non-permissive infection, however, AAV DNA synthesis was abnormal in that an expected accumulation of single-stranded progeny molecules was not observed. Finally, although intact 20S AAV transcripts were present in the cytoplasm of AGMK cells during non-permissive infection (in amounts ranging from 50 to 80% of that found during permissive infection), AAV-specific polypeptides were not demonstrable by polyacrylamide gel electrophoresis. Taken together, these experiments indicate that the host restriction of AAV replication in AGMK cells is exerted at the level of translation of the single AAV messenger RNA. In addition, it appears that one or more of the AAV polypeptides specified by this message is required for the production of single-stranded AAV progeny DNA.

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1979-06-01
2022-01-20
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