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Approximately 20 to 22 copies of adenovirus type 12 (Ad12) DNA per cell were integrated into the genome of the cell line T637. Only a few of these copies seemed to remain intact and colinear with virion DNA. All other persisting viral genomes exhibited deletions or inversions or both in the right-hand part of Ad12 DNA. Spontaneously arising morphological revertants of T637 cells has lost viral DNA. In most of the revertant cell lines only the intact or a part of the intact viral genome was preserved; other revertant cell lines has lost all viral DNA. In three other Ad12-transformed hamster cell lines, HA12/7, A2497-3, and CLAC3 (Stabel et al., J. Virol. 36:22-40, 1980), major rearrangements at the right end of the integrated Ad12 DNA were not found. These studies were performed to investigate the phenomena of amplification, rearrangements, and deletions of Ad12 DNA in hamster cells.

journal of virology

Integrated adenovirus type 12 DNA in the transformed hamster cell line T637: sequence arrangements at the termini of viral DNA and mode of amplification