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Mammalian NET-seq reveals genome-wide nascent transcription coupled to RNA processing

ABSTRACT: We have generated single-nucleotide resolution, nascent transcription profiles from HeLa cells by developing Native Elongation Transcript sequencing technology for mammalian chromatin (mNET-seq). Our extensive data sets provide a substantial resource to study mammalian nascent transcript profiles. We reveal unanticipated phosphorylation states for RNA polymerase II C-terminal domain (Pol II CTD) at both gene ends. We also observe that following 5’ splice site cleavage by the spliceosome, upstream exon transcripts are tethered to Pol II CTD phosphorylated on the serine 5 position (S5P) which is accumulated over downstream exons. We further show that depletion of termination factors substantially reduces Pol II pausing at gene ends leading to termination defects. Remarkably termination factors play an additional promoter role by restricting non-productive RNA synthesis and redistributing Pol II CTD S2P to promoters. These data demonstrate that CTD phosphorylation is more dynamic and variably distributed across mammalian transcription units than previously envisaged.

ORGANISM(S): Homo sapiens

PROVIDER: GSE60358 | GEO | 2015/04/23

SECONDARY ACCESSION(S): PRJNA258089

REPOSITORIES: GEO

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Mammalian NET-seq reveals genome-wide nascent transcription coupled to RNA processing

Project description:We have generated single-nucleotide resolution, nascent transcription profiles from HeLa cells by developing Native Elongation Transcript sequencing technology for mammalian chromatin (mNET-seq). Our extensive data sets provide a substantial resource to study mammalian nascent transcript profiles. We reveal unanticipated phosphorylation states for RNA polymerase II C-terminal domain (Pol II CTD) at both gene ends. We also observe that following 5’ splice site cleavage by the spliceosome, upstream exon transcripts are tethered to Pol II CTD phosphorylated on the serine 5 position (S5P) which is accumulated over downstream exons. We further show that depletion of termination factors substantially reduces Pol II pausing at gene ends leading to termination defects. Remarkably termination factors play an additional promoter role by restricting non-productive RNA synthesis and redistributing Pol II CTD S2P to promoters. These data demonstrate that CTD phosphorylation is more dynamic and variably distributed across mammalian transcription units than previously envisaged. To monitor nascent RNA within the mammalian Pol II complex, and its association with different CTD phosphorylation states, we employed mNET-seq methodology on HeLa cells, complemented with direct sequencing of chromatin-bound RNA (ChrRNA-seq). mNET-seq was preformed using the antibodies 8WG16, CMA602, CMA603 and CMA601, which are specific for unphosphorylated CTD, Ser2 phosphorylation, Ser5 phosphorylation and all CTD isoforms, respectively. In another experiment, to evaluate the effect of transcription termination factors in nascent RNA production by Pol II, mNET-seq and complemented with ChrRNA-seq was preformed on HeLa cells transfected with siRNA against PTBP1, CPSF73, CstF64+CstF64tau or Xrn2, and the gene profiles were compared with profiles from HeLa transfected with siRNA for Luciferase generated by the same protocol.

2015-04-23 | E-GEOD-60358 | biostudies-arrayexpress

Spliceosome specifically associates with CTD phospho-serine 5 isoform of RNA polymerase II to promote co-transcriptional splicing

Project description:Co-transcriptional splicing of introns is a defining feature of eukaryotic gene expression. We show that the mammalian spliceosome specifically associates with the S5P CTD isoform of RNA polymerase II (Pol II) as it elongates across spliced exons of protein coding genes, both in human Hela and murine lymphoid cell lines. Immuno-precipitation of MNase digested chromatin with phospho CTD specific antibodies reveals that components of the active spliceosome (both snRNA and proteins) form a specific complex with S5P CTD Pol II. Furthermore a dominant splicing intermediate formed by cleavage at intron 5’ss results in the tethering of upstream exons to this complex at all spliced exons. These are invariably connected to upstream spliced constitutive and less frequently to alternative exons. Finally S5P CTD Pol II accumulates over spliced exons but not adjacent introns. We propose that mammalian splicing employs a rapid, co-transcriptional splicing mechanism based on CTD phosphorylation transitions.

2018-10-05 | PXD008197 | Pride

Spliceosome specifically associates with RNA polymerase II CTD Ser5-P isoform to promote co-transcriptional splicing

2018-10-06 | GSE106881 | GEO

RNA polymerase II termination involves CTD tyrosine dephosphorylation by CPF subunit Glc7

Project description:At the 3'-ends of genes, RNA polymerase (Pol) II is dephosphorylated at tyrosine 1 residues of its C-terminal domain (CTD), resulting in recruitment of transcription termination factors. We show that the multisubunit cleavage and polyadenylation factor (CPF) is a Pol II CTD phosphatase and its Glc7 subunit is required for Tyr1 dephosphorylation at the poly-adenylation site and Pol II termination in vivo. ChIP-chip was performed to examine the effect of Glc7 nuclear depletion on genome-wide Pol II occupancy [using ?-Rpb3 (1Y26, cat. no. W0012, neoclone) antibody] and CTD tyrosine 1 phosphorylation levels [using ?-TyrY1P (3D12, D. Eick) antibody].

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RNA polymerase II activity revealed by GRO-seq and pNET-seq in Arabidopsis

Project description:RNA polymerase II (Pol II) play an essential role in gene expression. Here, we adapted mammalian Native Elongation Transcript sequencing and Global Run On sequencing to profile nascent RNA genome wide in Arabidopsis. We found Pol II tends to accumulate downstream of transcription start site and pausing at proximal promoter is an important regulatory step for Pol II transcription although loosely controlled. Furthermore, the Pol II with unphosphorylated carboxyl-terminal domain (CTD) mainly accumulates downstream the TSS, while the Ser5P CTD Pol II associates with spliceosome, and the Ser2P CTD Pol II presents a sharp peak 250 base pair downstream of polyadenylation site indicating a stringent control of termination for protein coding genes; whilst the termination of noncoding genes is not. Active expressed genes can be classified into three clusters according to the distribution patterns of different Pol II isoforms. In summary, we demonstrated the modified plant GRO-seq and mNET-seq are suitable to study RNA Pol II dynamics in planta. Although transcription is conserved among high eukaryotes, Pol II has its feature in Arabidopsis.

2018-09-30 | GSE109974 | GEO

Human TFIIH kinase CDK7 regulates transcription-associated epigenetic modification

Project description:CDK7 phosphorylates the RNA polymerase II (pol II) CTD and activates the P-TEFb- associated kinase, CDK9, but its regulatory roles remain obscure. Using human CDK7 analog-sensitive (CDK7as) cells, we observed reduced capping enzyme recruitment, increased pol II promoter-proximal pausing, and defective termination at gene 3'-ends upon CDK7 inhibition. We also found that CDK7 regulates chromatin modifications downstream of transcription start sites. H3K4me3 spreading was restricted at gene 5'-ends and H3K36me3 was displaced toward gene 3'-ends in CDK7as cells. Together, these results implicate a CDK7-dependent "CTD code" that regulates epigenetic marks in addition to RNA processing and pol II pausing.

2017-08-01 | GSE100040 | GEO

RNA polymerase II activity revealed by GRO-seq and pNET-seq in Arabidopsis

Project description:RNA polymerase II (Pol II) play an essential role in gene expression. Here, we adapted plant Native Elongation Transcript sequencing and Global Run On sequencing to profile nascent RNA genome wide in Arabidopsis. We found Pol II tends to accumulate downstream of transcription start site and pausing at proximal promoter is an important regulatory step for Pol II transcription although loosely controlled. Furthermore, the Pol II with unphosphorylated carboxyl-terminal domain (CTD) mainly accumulates downstream the TSS, while the Ser5P CTD Pol II associates with spliceosome, and the Ser2P CTD Pol II presents a sharp peak 250 base pair downstream of polyadenylation site indicating a stringent control of termination for protein coding genes; whilst the termination of noncoding genes is not. Active expressed genes can be classified into three clusters according to the distribution patterns of different Pol II isoforms. In summary, we demonstrated the modified plant GRO-seq and pNET-seq are suitable to study RNA Pol II dynamics in planta. Although transcription is conserved among high eukaryotes, Pol II has its feature in Arabidopsis.

2018-09-30 | GSE117014 | GEO

CTD tyrosine phosphorylation impairs termination factor recruitment to transcribing RNA polymerase II

Project description:ChIP-chip was performed to identify the genomic binding locations for the termination factors Nrd1, and Rtt103, and for RNA polymerase (Pol) II phosphorylated at the tyrosine 1 and threonine 4 position of its C-terminal domain (CTD). In different phases of the transcription cycle, Pol II recruits different factors via its CTD, which consists of heptapeptide repeats with the sequence Tyr1-Ser2-Pro3-Thr4-Ser5-Pro6-Ser7. Here we show that the CTD of transcribing yeast Pol II is phosphorylated at Tyr1, and that this impairs recruitment of termination factors. Tyr1 phosphorylation levels rise downstream of the transcription start site (TSS), and decrease before the polyadenylation (pA) site. Tyr1-phosphorylated gene bodies are depleted of CTD-binding termination factors Nrd1, Pcf11, and Rtt103. Tyr1 phosphorylation blocks CTD binding by these termination factors, but stimulates binding of elongation factor Spt6. These results show that CTD modifications can not only stimulate but also block factor recruitment, and lead to an extended CTD code for transcription cycle coordination.

2012-06-29 | E-MTAB-1060 | biostudies-arrayexpress

Nuclear Surveillance of long intervening noncoding RNA

Project description:Numerous long intervening non-coding RNA (lincRNA) are generated from the mammalian genome by RNA polymerase II (Pol II) transcription. Although multiple functions have been ascribed to lincRNA, their synthesis and turnover remain poorly characterised. Here we define systematic differences in transcription and RNA processing between protein-coding and lincRNA genes in human HeLa cells. This is based on a range of nascent transcriptomic approaches applied to different nuclear fractions, including mammalian native elongating transcript sequencing (mNET-seq). Notably mNET-seq patterns specific for different Pol II CTD phosphorylation states reveal weak co-transcriptional splicing and poly(A) signal independent Pol II termination on lincRNA as compared to pre-mRNA. In addition, lincRNA are mostly restricted to chromatin where they are co-transcriptionally degraded by the RNA exosome. We also show that a lincRNA specific co-transcriptional RNA cleavage mechanism acts to induce premature termination. In effect functional lincRNA must escape from this targeted nuclear surveillance process.

2017-01-04 | GSE81662 | GEO

The conserved protein Seb1 drives transcription termination by binding RNA polymerase II and nascent RNA

Project description:Termination of Pol II transcription is an important step in the transcription cycle and is responsible for dislodgement of polymerase from DNA which leads to the release of a functional transcript. Recent studies have identified key players important for termination and showed a conserved domain that interacts with the phosphorylated C-terminus of Pol II (CTD-Interacting-Domain, CID) to constitute a common feature of these proteins. However, the mechanism by which transcription termination is achieved, is not understood. Using genome-wide methods, we demonstrate that the fission yeast CID protein Seb1 is essential for termination of protein-coding and non-coding genes through interacting with S2-phosphorylated Pol II and nascent RNA. Furthermore, we present the crystal structures of the Seb1 CTD- and RNA-binding modules. Unexpectedly, the latter reveals a novel intertwined two-domain arrangement of a canonical RRM and a second domain. These results provide important insights into the mechanism underlying eukaryotic transcription termination.

2017-02-05 | GSE89914 | GEO

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