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. 1989 Jan;63(1):165–174. doi: 10.1128/jvi.63.1.165-174.1989

Spontaneous rearrangement of integrated simian virus 40 DNA in nine transformed rodent cell lines.

T Gurney Jr 1, E G Gurney 1
PMCID: PMC247669  PMID: 2562813

Abstract

Frequencies of spontaneous DNA rearrangement within or near integrated simian virus 40 (SV40) DNA were measured in four transformed mouse and rat cell lines of independent origin and in five clones of the SV40-transformed mouse line SVT2. Rearrangements were detected as polymorphisms of restriction enzyme fragment length in subclones of the lines. At least 17% of the subclones of each line had detectable rearrangements. The rate of rearrangement was calculated to be at least 5 x 10(-3) events per cell per division. No rearrangements were detected in sequences of an immunoglobulin gene, part of the coding region of the mouse protein p53, and five proto-oncogenes. The possible role of recombination between duplicated segments of integrated SV40 DNA in generating rearrangements was studied in the five SVT2 clones, which differed in the number of duplications within a single SV40 DNA segment. The SVT2 clone that had no duplications, M3, became rearranged further at least as frequently as did closely related lines with one, two, or three duplications. Another line in this group that had one small duplication, X1, had a much higher frequency of rearrangement than did the others; integrated SV40 DNA of X1 became mostly rearranged within 100 cell divisions. The examples of M3 and X1 suggested that the high rate of rearrangement characteristic of integrated SV40 DNA was influenced more by the presence of particular sequences within or near integrated SV40 DNA than by the number or extent of duplicated sequences.

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Selected References

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