Octamer displacement and redistribution in transcription of single nucleosomes

Marie françoise O'donohue, Isabelle Duband-goulet, Ali Hamiche, Ariel Prunell

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Abstract

Single nucleosomes were assembled on a 357bp DNA fragment containing a 5S RNA gene from sea urchin and a promoter for SP6 RNA polymerase, and were fractionated as a function of their positions by gel electrophoresls (1,2). Transcribed nucleosome positions were detected by observing band disappearance in gels, which In turn provided evidence for the displacement of the histone octamer upon transcription. Differential band disappearance showed that nucleosomes closer to the promoter were harder to transcribe, and transcription was blocked when the nucleosome proximal boundary was at the start site. Nucleosomes located at discrete positions were also eluted from the gel bands and transcribed. In this case, new bands appeared as a consequence of octamer redistribution. Such redistribution occurred over all untranscrlbed positions, as well as over transcribed positions close enough to the promoter. Similar conclusions were derived from another previously investigated fragment containing a Xenopus 5S RNA gene (3,4).

Original languageEnglish
Pages (from-to)937-945
Number of pages9
JournalNucleic Acids Research
Volume22
Issue number6
DOIs
Publication statusPublished - 25 Mar 1994
Externally publishedYes

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ASJC Scopus subject areas

  • Genetics

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