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J Virol. 1968 July; 2(7): 723-727
Copyright © 1968 American Society for Microbiology. All Rights Reserved.

Incorporation of Iododeoxyuridine into Cellular Deoxyribonucleic Acid Synthesized After Infection with Simian Virus 40

Hygiene-Institut, Universität Freiburg i. Br., West Germany

ABSTRACT

Primary monkey kidney cells (Cerocpithecus aethiops) in the stationary phase of growth were labeled with ¹⁴C-thymidine for 24 hr prior to infection with simian virus 40 (strain 777). ³H-deoxyadenosine and 5-iodo-2'-deoxyuridine (IUdR) were added to some of the cultures 24, 48, or 72 hr after infection; 24 hr later the deoxyribonucleic acid (DNA) was extracted from these cultures and centrifuged in a CsCl density gradient. The portion of DNA which had become heavier because of incorporation of IUdR could be seen as a second peak in the sedimentation profile. This peak contained ¹⁴C as well as ³H activity. The possibility that the ¹⁴C-labeled cellular DNA might be degraded and used for the synthesis of viral DNA could be excluded. On the basis of these results, it must be assumed that the infection of monkey kidney cells with simian virus 40 induces the synthesis of cellular DNA.