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Elife. 2014 Apr 29;3:e02407. doi: 10.7554/eLife.02407.

Genome-wide dynamics of Pol II elongation and its interplay with promoter proximal pausing, chromatin, and exons.

Author information

1
Department of Molecular Biology and Genetics, Cornell University, Ithaca, United States ihj3@cornell.edu.
2
Howard Hughes Medical Institute, University of Michigan, Ann Harbor, United States.
3
Department of Molecular Biology and Genetics, Cornell University, Ithaca, United States johnlis@cornell.edu.

Abstract

Production of mRNA depends critically on the rate of RNA polymerase II (Pol II) elongation. To dissect Pol II dynamics in mouse ES cells, we inhibited Pol II transcription at either initiation or promoter-proximal pause escape with Triptolide or Flavopiridol, and tracked Pol II kinetically using GRO-seq. Both inhibitors block transcription of more than 95% of genes, showing that pause escape, like initiation, is a ubiquitous and crucial step within the transcription cycle. Moreover, paused Pol II is relatively stable, as evidenced from half-life measurements at ∼3200 genes. Finally, tracking the progression of Pol II after drug treatment establishes Pol II elongation rates at over 1000 genes. Notably, Pol II accelerates dramatically while transcribing through genes, but slows at exons. Furthermore, intergenic variance in elongation rates is substantial, and is influenced by a positive effect of H3K79me2 and negative effects of exon density and CG content within genes.DOI: http://dx.doi.org/10.7554/eLife.02407.001.

KEYWORDS:

GRO-seq; P-TEFb; RNA polymerase II; elongation rate; pausing

PMID:
24843027
PMCID:
PMC4001325
[Indexed for MEDLINE]
Free PMC Article

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