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Biochem Cell Biol. 2016 Feb;94(1):82-92. doi: 10.1139/bcb-2015-0045. Epub 2015 Sep 15.

RNA polymerase II pausing as a context-dependent reader of the genome.

Author information

1
Department of Basic Sciences, University of North Dakota School of Medicine, Grand Forks, ND 58201, USA.

Abstract

The RNA polymerase II (Pol II) transcribes all mRNA genes in eukaryotes and is among the most highly regulated enzymes in the cell. The classic model of mRNA gene regulation involves recruitment of the RNA polymerase to gene promoters in response to environmental signals. Higher eukaryotes have an additional ability to generate multiple cell types. This extra level of regulation enables each cell to interpret the same genome by committing to one of the many possible transcription programs and executing it in a precise and robust manner. Whereas multiple mechanisms are implicated in cell type-specific transcriptional regulation, how one genome can give rise to distinct transcriptional programs and what mechanisms activate and maintain the appropriate program in each cell remains unclear. This review focuses on the process of promoter-proximal Pol II pausing during early transcription elongation as a key step in context-dependent interpretation of the metazoan genome. We highlight aspects of promoter-proximal Pol II pausing, including its interplay with epigenetic mechanisms, that may enable cell type-specific regulation, and emphasize some of the pertinent questions that remain unanswered and open for investigation.

KEYWORDS:

Pol II; RNA polymerase pausing; epigenetics; gene regulation; pause de l’ARN polymérase II; régulation génique; transcription; épigénétique

PMID:
26555214
PMCID:
PMC4728023
DOI:
10.1139/bcb-2015-0045
[Indexed for MEDLINE]
Free PMC Article

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