Local domains of supercoiling activate a eukaryotic promoter in vivo (original) (raw)
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- Published: 25 February 1993
Nature volume 361, pages 746–748 (1993)Cite this article
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Abstract
EXPERIMENTS correlating template topology with transcriptional activity suggest that DNA topology plays a role in eukaryotic gene expression1–4. Linear templates transfected into cultured cells produce far fewer transcripts than do circular transcription templates3, and no transcripts can be detected from linear templates injected into Xenopus oocytes1,2. Further, when transcriptionally active circular templates in Xenopus oocytes are linearized by injection of a restriction enzyme, transcription dramatically decreases. Here we show that transcription by phage T7 RNA polymerase from a divergent promoter can partially replace the requirement for circular Xenopus ribosomal RNA transcription templates in Xenopus oocytes. Supercoiled domains can apparently be generated on short pieces of DNA having no known sequences that result in association with the nuclear architecture, suggesting that localized, transient domains of supercoiling fulfil the minimum topological needs for Xenopus rRNA transcription
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Authors and Affiliations
- Division of Biochemistry and Molecular Biology, Department of Molecular and Cell Biology, University of California, Berkeley, California, 94720, USA
Marietta Dunaway - Department of Cellular and Molecular Biology, Human Genome Center, Lawrence Berkeley Laboratory, Berkeley, California, 94720, USA
Elaine A. Ostrander
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- Marietta Dunaway
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Dunaway, M., Ostrander, E. Local domains of supercoiling activate a eukaryotic promoter in vivo.Nature 361, 746–748 (1993). https://doi.org/10.1038/361746a0
- Received: 01 November 1992
- Accepted: 30 December 1992
- Issue Date: 25 February 1993
- DOI: https://doi.org/10.1038/361746a0
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