Transcription Initiation Patterns Indicate Divergent Strategies for Gene Regulation at the Chromatin Level: e1001274

The application of deep sequencing to map 5' capped transcripts has confirmed the existence of at least two distinct promoter classes in metazoans: "focused" promoters with transcription start sites (TSSs) that occur in a narrowly defined genomic span and "dispersed" promote...

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Veröffentlicht in:PLoS genetics 2011-01, Vol.7 (1)
Hauptverfasser: Rach, Elizabeth A, Winter, Deborah R, Benjamin, Ashlee M, Corcoran, David L, Ni, Ting, Zhu, Jun, Ohler, Uwe
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container_title PLoS genetics
container_volume 7
creator Rach, Elizabeth A
Winter, Deborah R
Benjamin, Ashlee M
Corcoran, David L
Ni, Ting
Zhu, Jun
Ohler, Uwe
description The application of deep sequencing to map 5' capped transcripts has confirmed the existence of at least two distinct promoter classes in metazoans: "focused" promoters with transcription start sites (TSSs) that occur in a narrowly defined genomic span and "dispersed" promoters with TSSs that are spread over a larger window. Previous studies have explored the presence of genomic features, such as CpG islands and sequence motifs, in these promoter classes, but virtually no studies have directly investigated the relationship with chromatin features. Here, we show that promoter classes are significantly differentiated by nucleosome organization and chromatin structure. Dispersed promoters display higher associations with well-positioned nucleosomes downstream of the TSS and a more clearly defined nucleosome free region upstream, while focused promoters have a less organized nucleosome structure, yet higher presence of RNA polymerase II. These differences extend to histone variants (H2A.Z) and marks (H3K4 methylation), as well as insulator binding (such as CTCF), independent of the expression levels of affected genes. Notably, differences are conserved across mammals and flies, and they provide for a clearer separation of promoter architectures than the presence and absence of CpG islands or the occurrence of stalled RNA polymerase. Computational models support the stronger contribution of chromatin features to the definition of dispersed promoters compared to focused start sites. Our results show that promoter classes defined from 5' capped transcripts not only reflect differences in the initiation process at the core promoter but also are indicative of divergent transcriptional programs established within gene-proximal nucleosome organization.
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Previous studies have explored the presence of genomic features, such as CpG islands and sequence motifs, in these promoter classes, but virtually no studies have directly investigated the relationship with chromatin features. Here, we show that promoter classes are significantly differentiated by nucleosome organization and chromatin structure. Dispersed promoters display higher associations with well-positioned nucleosomes downstream of the TSS and a more clearly defined nucleosome free region upstream, while focused promoters have a less organized nucleosome structure, yet higher presence of RNA polymerase II. These differences extend to histone variants (H2A.Z) and marks (H3K4 methylation), as well as insulator binding (such as CTCF), independent of the expression levels of affected genes. 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subjects Chromatin
Gene expression
Genetics
Genomes
Insects
RNA polymerase
title Transcription Initiation Patterns Indicate Divergent Strategies for Gene Regulation at the Chromatin Level: e1001274
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