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Genomic Study of RNA Polymerase II and III SNAPc-Bound Promoters Reveals a Gene Transcribed by both Enzymes and a Broad Use of Common Activators

ABSTRACT: SNAPc-dependent promoters are unique among cellular promoters in being very similar to each other, even though some of them recruit RNA polymerase II and other RNA polymerase III. We have examined all SNAPc-bound promoters present in the human genome. We find that there is a surprisingly small number of them, some 70 promoters. Among these, the large majority is bound by either RNA polymerase II or RNA polymerase III, as expected, but one gene hitherto considered an RNA polymerase III gene is also occupied by significant levels of RNA polymerase II, which synthesizes an RNA distinct from that synthesized by RNA polymerase III. Both RNA polymerase II and RNA polymerase III SNAPc- dependent promoters use a largely overlapping set of a few transcription activators, including GABP, a novel factor implicated in snRNA gene transcription.

ORGANISM(S): Homo sapiens

PROVIDER: GSE38303 | GEO | 2012/11/22

SECONDARY ACCESSION(S): PRJNA167635

REPOSITORIES: GEO

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Genomic Study of RNA Polymerase II and III SNAPc-Bound Promoters Reveals a Gene Transcribed by both Enzymes and a Broad Use of Common Activators

Project description:SNAPc-dependent promoters are unique among cellular promoters in being very similar to each other, even though some of them recruit RNA polymerase II and other RNA polymerase III. We have examined all SNAPc-bound promoters present in the human genome. We find that there is a surprisingly small number of them, some 70 promoters. Among these, the large majority is bound by either RNA polymerase II or RNA polymerase III, as expected, but one gene hitherto considered an RNA polymerase III gene is also occupied by significant levels of RNA polymerase II, which synthesizes an RNA distinct from that synthesized by RNA polymerase III. Both RNA polymerase II and RNA polymerase III SNAPc- dependent promoters use a largely overlapping set of a few transcription activators, including GABP, a novel factor implicated in snRNA gene transcription. SNAPc-dependent promoters in the human genome

2012-11-22 | E-GEOD-38303 | biostudies-arrayexpress

Structural basis of SNAPc-dependent snRNA transcription intiation by RNA polymerase II

Project description:RNA Polymerase II (Pol II) carries out transcription of both protein-coding and non-coding genes. Whereas Pol II initiation at protein-coding genes has been studied in detail, Pol II initiation at non-coding genes such as small nuclear RNA (snRNA) genes is not understood at the structural level. Here we study Pol II initiation at snRNA gene promoters and show that the snRNA-activating protein complex (SNAPc) enables DNA opening and transcription initiation independent of TFIIE and TFIIH in vitro. We then resolve cryo-EM structures of the SNAPc-containing Pol II preinitiation complex (PIC) assembled on U1 and U5 snRNA promoters. The core of SNAPc binds two turns of DNA and recognizes the snRNA promoter-specific proximal sequence element (PSE) located upstream of the TATA box-binding protein TBP. Two extensions of SNAPc called wing-1 and wing-2 bind TFIIA and TFIIB, respectively, explaining how SNAPc directs Pol II to snRNA promoters. Comparison of structures of closed and open promoter complexes elucidates TFIIH-independent DNA opening. These results provide the structural basis of Pol II initiation at non-coding RNA gene promoters.

2023-03-11 | PXD033638 | Pride

Homo sapiens

Project description:Genomic Study of RNA Polymerase II and III SNAPc-Bound Promoters Reveals a Gene Transcribed by both Enzymes and a Broad Use of Common Activators

| PRJNA167635 | ENA

RNA Pol III transcriptomes and relationships to Pol II promoters, enhancer-binding factors and chromatin domains

Project description:RNA polymerase III transcribes many noncoding RNAs (e.g. tRNAs) important for translational capacity and other functions. Here, we localized RNA polymerase III, alternative TFIIIB complexes (BRF1/2) and TFIIIC in HeLa cells, determining the Pol III transcriptome, defining gene classes, and revealing ‘TFIIIC-only’ sites. Pol III localization in other transformed and primary cell lines revealed both novel and cell-type specific Pol III loci, and one occupied miRNA. Surprisingly, only a fraction of the in silico-predicted Pol III loci are occupied. Interestingly, 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. Remarkably, Pol III occupancy scales with the levels of nearby Pol II, active chromatin and CpG content. Taken together, active promoter and enhancer-like chromatin appears to gate Pol III accessibility to the genome. Use of ChIP-array to identify genomic regions bound by RNA Polymerase III machinery

2010-04-14 | E-GEOD-20609 | biostudies-arrayexpress

ChIP-chip analyses of PR- related pathway in human oncocytic thyroid tumor cell line XTC.UC1

Project description:ChIP-chip analyses of five transcription factors (ERR1, GABP, NRF1, CREB and YY1) PRC coactivator and RNA polymerase II in XTC.UC1 cells compared to non specific IP (IgG or input) seven factors studied: ERR1, GABP, NRF1, CREB, YY1, PRC, RNAPolII

2017-11-07 | GSE106597 | GEO

Genome-wide analysis of the SNAPc complex [ChIP-Seq]

Project description:The small nuclear RNA (snRNA)-activating protein complex (SNAPc) is a basal transcription factor that mediates the transcriptional activation of snRNAs. Here, we describe the genome-wide occupancy of the SNAPC1 and SNAPC4 subunits of SNAPc. While the SNAPC4 occupancy was in accord with the role for SNAPc in snRNA transcription, SNAPC1 displayed a broader genomic profile mirroring that of RNA polymerase II at highly active protein-coding genes. Our functional analysis revealed a role for SNAPc1 in regulation of both basal and activator-induced transcription of protein-coding genes. These studies expand the role for SNAPC1 beyond its regulation of snRNA transcription.

2012-09-28 | GSE37403 | GEO

Genome-wide analysis of the SNAPc complex [Illumina array]

Project description:The small nuclear RNA (snRNA)-activating protein complex (SNAPc) is a basal transcription factor that mediates the transcriptional activation of snRNAs. Here, we describe the genome-wide occupancy of the SNAPC1_and SNAPC4 subunits of SNAPc. While the SNAPC4 occupancy was in accord with the role for SNAPc in snRNA transcription, SNAPC1_displayed a broader genomic profile mirroring that of RNA polymerase II at highly active protein-coding genes. Our functional analysis revealed a role for SNAPC1_in regulation of both basal and activator-induced transcription of protein-coding genes. These studies expand the role for SNAPC1_beyond its regulation of snRNA transcription.

2012-10-12 | GSE41528 | GEO

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

Project description: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. Use of ChIP-seq to identify genomic regions bound by RNA Polymerase III machinery in multiple cell types as well as RNA-seq in HeLa for gene expression analysis. See GSE20609 for whole human genome raw Pol III ChIP-array data. See link below for supplementary methods and analysis.

2010-04-14 | E-GEOD-20309 | biostudies-arrayexpress

Genome-wide analysis of the SNAPc complex [ChIP-Seq]

2012-09-28 | E-GEOD-37403 | biostudies-arrayexpress

RNA polymerase III regulation during mammalian tissue regeneration

Project description:There are about 600 loci in the mammalian genome that are annotated as RNA polymerase III genes. These comprise tRNA genes, the genes encoding 5S RNA, the smallest ribosomal RNA, and genes encoding catalytic or structural RNAs involved in processes as diverse as RNA processing or transcription elongation. Most RNA polymerase III genes have similar promoter structures, yet they are transcribed with different efficiencies. Here we have explored how RNA polymerase III occupancy of these genomic loci varies in a normal tissue, the liver, during the transition from a resting state to a proliferating state. We find that after partial hepatectomy, which causes synchronous entry of remaining liver cells into the cell division cycle, there is a tremendous increase in RNA polymerase III occupancy. This increase is, however, not uniform and concerns mostly loci that were lowly occupied by RNA polymerase III in resting liver. The changes in RNA polymerase III occupancy cannot be correlated with changes in RNA polymerase II occupancy around the RNA polymerase III loci nor at nearby RNA polymerase II promoters. RNA polymerase III loci with the largest fold change tend to be located in clusters, with the cluster displaying the largest changes located on chromosome 13. This suggests that increases in RNA polymerase III occupancy during the transition from resting to proliferating state affect mostly genes whose basal rate of transcription is relatively low and which are located in clusters.

2018-12-12 | GSE114650 | GEO

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