Human RNA polymerase III transcriptomes and relationships to Pol II promoter chromatin and enhancer-binding factors.

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• Claudia Kutter (Cancer Research UK, Cambridge Research Institute)
• Monday 28 June 2010, 15:30-16:30
• Room 132, CRI.

If you have a question about this talk, please contact Stefan Gräf.

Nat Struct Mol Biol. 2010 May;17(5):620-8. Epub 2010 Apr 25. Pubmed: 20418882

Abstract

RNA polymerase (Pol) III transcribes many noncoding RNAs (for example, transfer RNAs) important for translational capacity and other functions. We localized Pol III , alternative TFIIIB complexes (BRF1 or BRF2 ) and TFIIIC in HeLa cells to determine the Pol III transcriptome, define gene classes and reveal ‘TFIIIC-only’ sites. Pol III localization in other transformed and primary cell lines reveals previously uncharacterized and cell type-specific Pol III loci as well as one microRNA. Notably, only a fraction of the in silico-predicted Pol III loci are occupied. Many occupied Pol III genes reside within an annotated Pol II promoter. Outside of Pol II promoters, occupied Pol III genes overlap with enhancer-like chromatin and enhancer-binding proteins such as ETS1 and STAT1 . Moreover, Pol III occupancy scales with the levels of nearby Pol II, active chromatin and CpG content. These results suggest that active chromatin gates Pol III accessibility to the genome.

This talk is part of the CRI Reading Group on Cancer Systems Biology series.

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