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. 1988 Aug;8(8):3298–3302. doi: 10.1128/mcb.8.8.3298

Insertional activation of a promoterless thymidine kinase gene.

S Hiller 1, M Hengstler 1, M Kunze 1, R Knippers 1
PMCID: PMC363563  PMID: 2850488

Abstract

A plasmid carrying a promoterless herpes simplex virus thymidine kinase gene was transfected via calcium phosphate precipitation into LM (tk-) mouse fibroblast cells. The transfected gene was efficiently expressed, as the transfected cells grew perfectly well in selective hypoxanthine-aminopterin-thymidine medium, suggesting that the thymidine kinase-coding region became linked to a promoterlike element on integration into the recipient genome. To investigate the structure of the surrogate promoter, we first isolated the integrated gene from a genomic library. The nucleotide sequence of the DNA adjacent to the thymidine kinase-coding sequence was then determined. We found, first, that the integration of the transfected DNA apparently occurred by a blunt end ligation mechanism involving no obvious sequence similarities between integrated and recipient DNA and, second, that the 5'-flanking region included a TATA box, two CCAAT boxes, and a GC box element. However, the TATA box motif and the most proximal CCAAT box appeared to be sufficient for full promoter activity, as determined by the transfection efficiencies of appropriate plasmid constructs. Except for these canonical promoter elements, the surrogate promoter had no obvious similarities to known thymidine kinase gene promoters.

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Selected References

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