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In a previous report, evidence was presented that the deoxyribonucleic acid (DNA) of adenovirus type 12 (Ad12) is integrated by covalent linkage into the DNA of baby hamster kidney cells (BHK-21 cells). These studies have been extended. The DNA of Ad12 and that of BHK-21 cells grown in medium containing 5-bromodeoxyuridine could be separated by equilibrium centrifugation in alkaline CsCl density gradients. BHK-21 cells were infected with3 H-labeled Ad12, and the total intracellular DNA was analyzed at various times after infection in alkaline CsCl density gradients. The3 H label in the position of cellular DNA hybridized predominantly with viral DNA and to a lesser extent also with cellular DNA. Replication of viral DNA could not be detected in BHK-21 cells. The appearance of viral3 H label in the density stratum of cellular DNA was not significantly affected when DNA synthesis in Ad12-infected BHK-21 cells was inhibited &gt;96% by cytosine arabinoside. These findings provided additional evidence for integration of Ad12 DNA into the DNA of BHK-21 cells. It could be calculated that 5 to 55 Ad12 DNA equivalents per cell are integrated. Replication of viral or cellular DNA was not required for integration. Inhibition of protein or ribonucleic acid synthesis interfered with integration only slightly.

Integration of the Deoxyribonucleic Acid of Adenovirus Type 12 into the Deoxyribonucleic Acid of Baby Hamster Kidney Cells