Abstract
A mutant of polyomavirus, F441, selected to grow in undifferentiated mouse F9 embryonal carcinoma cells, carries a single-base change in the enhancer region at nucleotide (nt) 5233 of the viral genome. Enhancers of most of the F9 mutants have a duplicated segment of viral DNA encompassing nt 5233. The minimum duplicated segment of all the known F9 mutants is from nt 5218 to nt 5239. We prepared oligonucleotides spanning the sequence from nt 5218 through nt 5239 of the genome of the wild type and F441 and examined the biological activities of the oligonucleotides by a transient assay of chloramphenicol acetyltransferase (CAT) gene expression in F9 cells. The oligonucleotide harboring the F441 mutation was shown to increase cat gene expression in F9 cells when linked at an upstream position in both orientations. When dimerized at an upstream position, the F441 oligonucleotide showed even higher cat gene expression enhancing activity. In contrast, no such effects were observed with the oligonucleotide of the wild-type sequence. In addition, the F441 oligonucleotide, but not the wild-type sequence, could inhibit the activity of whole enhancer fragment of F441 when cotransfected into F9 cells in excess amounts. On the basis of the results obtained, we suggest that the segment of F441 enhancer encompassing the point mutation contains a target for a cellular factor(s) which acts in a positive manner to increase the transcription of a gene in undifferentiated mouse F9 cells.
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