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. 1986 Sep;6(9):3068–3076. doi: 10.1128/mcb.6.9.3068

Induction of specific transcription by RNA polymerase III in transformed cells.

M F Carey, K Singh, M Botchan, N R Cozzarelli
PMCID: PMC367041  PMID: 3023960

Abstract

RNA polymerase III (pol III) transcripts of the highly repeated mouse B2 gene family are increased in many oncogenically transformed murine cell lines. In cells transformed by simian virus 40, the small, cytoplasmic B2 RNAs are present at 20-fold-higher levels than in normal cells (M. R. D. Scott, K. Westphal, and P. W. J. Rigby, Cell 34:557-567, 1983; K. Singh, M. Carey, S. Saragosti, and M. Botchan, Nature [London] 314:553-556). We found that transcripts of the highly repeated B1 gene family are also increased 20-fold upon simian virus 40 transformation and showed that these RNAs result from pol III transcription. In contrast, transcripts from less highly repeated pol III templates such as the 5S, 7SL, 7SK, 4.5SI, tRNAMet, and tRNAPro genes are unaffected. The expression of the B2 RNAs in isolated nuclei shows that the augmentation is due mainly to an increased rate of transcription by pol III. There is thus specific transformation-inducible pol III transcription. We developed an in vitro transcription assay which utilizes genomic DNA as a template to study the transcription of all members of a repetitive gene family in their native context. This assay reproduces the low cytoplasmic levels of B1 compared with B2 RNAs suggesting that this ratio is dictated by intrinsic signals in the DNA.

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