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Cell Cycle. 2009 Aug 15;8(16):2557-64. Epub 2009 Aug 19.

Divergent transcription: a new feature of active promoters.

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  • 1Koch Institute, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.

Abstract

Divergent transcription is common of many promoters in organisms as diverse as mammals and yeast. Many independent experiments indicate that RNA polymerase II is frequently initiated but paused in the sense direction downstream from the promoter. Similarly a second peak of transcriptionally-engaged polymerase is paused in the anti-sense direction upstream of the promoter. Chromatin modifications that are associated with active promoters reside in nucleosomes immediately flanking this pair of paused polymerases. The nucleosome-free region associated with most promoters could in part be defined by this divergent transcription. The potential implications of divergent transcription on gene regulation and possible mechanisms that give rise to this phenomenon are discussed.

PMID:
19597342
[PubMed - indexed for MEDLINE]
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