Genomic organization of human transcription initiation complexes.

Venters BJ, Pugh BF
Nature. 2013 502 (7469): 53-8

PMID: 24048476 · PMCID: PMC4018585 · DOI:10.1038/nature12535

The human genome is pervasively transcribed, yet only a small fraction is coding. Here we address whether this non-coding transcription arises at promoters, and detail the interactions of initiation factors TATA box binding protein (TBP), transcription factor IIB (TFIIB) and RNA polymerase (Pol) II. Using ChIP-exo (chromatin immunoprecipitation with lambda exonuclease digestion followed by high-throughput sequencing), we identify approximately 160,000 transcription initiation complexes across the human K562 genome, and more in other cancer genomes. Only about 5% associate with messenger RNA genes. The remainder associates with non-polyadenylated non-coding transcription. Regardless, Pol II moves into a transcriptionally paused state, and TBP and TFIIB remain at the promoter. Remarkably, the vast majority of locations contain the four core promoter elements- upstream TFIIB recognition element (BREu), TATA, downstream TFIIB recognition element (BREd), and initiator element (INR)-in constrained positions. All but the INR also reside at Pol III promoters, where TBP makes similar contacts. This comprehensive and high-resolution genome-wide detection of the initiation machinery produces a consolidated view of transcription initiation events from yeast to humans at Pol II/III TATA-containing/TATA-less coding and non-coding genes.

MeSH Terms (15)

Chromatin Genome, Human HeLa Cells Hep G2 Cells Humans K562 Cells MCF-7 Cells Nucleotide Motifs Polyadenylation Promoter Regions, Genetic RNA, Messenger RNA, Transfer TATA Box Transcription Factors Transcription Initiation, Genetic

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