Abstract

Antagonists of DNA inhibited the growth of Rous sarcoma virus (RSV) and Rous-associated virus (RAV). Actinomycin D and mitomycin D inhibited the growth of both viruses and demonstrated a general involvement of DNA in virus synthesis. A specific requirement for DNA synthesis in virus growth was demonstrated using 5-iododeoxyuridine and cytosine arabinoside. Inhibition of virus growth by 5-iododeoxyuridine was reduced by the presence of thymidine in the medium, and deoxycytidine prevented inhibition by cytosine arabinoside. The requirement for DNA synthesis in the growth of RSV was transitory, which suggests that a viral DNA “primer” is synthesized in infected cells during the growth cycle of RSV.

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