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. 1994 Jan;68(1):187–194. doi: 10.1128/jvi.68.1.187-194.1994

Selective sites of adenovirus (foreign) DNA integration into the hamster genome: changes in integration patterns.

G Orend 1, A Linkwitz 1, W Doerfler 1
PMCID: PMC236277  PMID: 8254728

Abstract

We investigated whether, upon the integration of multiple copies of adenovirus type 12 (Ad12) DNA into an established mammalian (hamster) genome, the pattern of foreign DNA insertion would remain stable or change with consecutive passages of cells in culture. By the injection of purified Ad12 into newborn hamsters, tumors were induced, cells from these tumors were cultivated, and five independent cell lines, HT5, H201/2, H201/3, H271, and H281, were established. These cell lines carried different copy numbers of Ad12 DNA per cell in an integrated form and differed in morphology. Cell line HT5 had been passed twice through hamsters as tumor cells and was subsequently passaged in culture. Patterns of Ad12 DNA integration were determined by restriction cleavage of the nuclear DNA with BamHI, EcoRI, HindIII, MspI, or PstI followed by Southern blot hybridization using 32P-labeled Ad12 DNA or its cloned terminal DNA fragments as hybridization probes. In this way, the off-size fragments, which represented the sites of linkage between Ad12 and cellular DNAs, were determined. At early passage levels in culture, the integration sites of Ad12 DNA in the hamster genome, as characterized by the positions of off-size fragments in agarose or polyacrylamide gel electrophoresis, were different in the five different tumor cell lines. Upon repeated passage, however, the off-size fragment patterns generated by the five restriction endonucleases became very similar in the five tumor cell lines. This surprising result indicates that under cell culture conditions, Ad12-transformed tumor cell lines that carry the foreign (Ad12) genome in selective, probably very similar sites of the cellular genome evolve.

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Selected References

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