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The adenovirus type 12 (Ad12)-induced mouse tumor CBA-12-1-T contains greater than 30 copies of viral DNA integrated into cellular DNA. One of the sites of linkage between the left terminus of Ad12 DNA and mouse DNA was cloned, mapped and sequenced by using conventional techniques. The preinsertion sequence was also cloned from normal CBA/J mouse DNA and sequenced. The sequence data and blotting analyses demonstrated that at the site of linkage nine nucleotide pairs of viral DNA and at least 1500 to 1600 nucleotide pairs of cellular DNA were deleted. Up to the site of linkage, the cellular DNA sequence in CBA-12-1-T tumor DNA and the preinsertion sequence in CBA/J mouse cells were identical. The site of Ad12 DNA integration was found to be located close to a site of transition from unique to repetitive cellular DNA sequences. The nucleotide sequence at the site of linkage and at the preinsertion site revealed palindromic stretches of 5 and 10 nucleotides pairs, respectively. Scattered patch homologies (8-10 nucleotide pairs long) were observed between adenoviral and cellular DNAs. A hypothetical model for DNA arrangements at the site of recombination is presented.

Deletion of cellular DNA at site of viral DNA insertion in the adenovirus type 12-induced mouse tumor CBA-12-1-T