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Targeting CDK7 function in the RNA Polymerase II transcription cycle in inflammatory arthritis [ChIP-seq]

ABSTRACT: Macrophages are main drivers of inflammation and tissue damage in autoimmune diseases including rheumatoid arthritis. The rate-limiting step for transcription of >70% of inducible genes in macrophages is RNA Polymerase II (Pol II) promoter-proximal pause release, yet, the specific role of Pol II pausing in inflammation or whether it can be modulated therapeutically is unknown. Genetic ablation of a pause-stabilizing negative elongation factor (NELF) in macrophages enhanced the transcriptional response of paused anti-inflammatory genes to LPS, followed by secondary attenuation of inflammatory signaling, and reduced severity of K/BxN-serum transfer (ST) arthritis in mice. To disrupt Pol II pause establishment pharmacologically, we employed covalent inhibitors of the TFIIH-associated cyclin-dependent kinase (CDK) 7, THZ1 and YKL-5-124. Both dramatically reduced Pol II pausing in murine and human macrophages, broadly suppressed induction of pro- but not anti-inflammatory genes, and rapidly reversed pre-established inflammatory macrophage polarization by TNF+IFNγ. In vivo, CDK7i ameliorated the acute K/BxN-ST and chronic progressive hTNF-transgenic arthritis in mice. Finally, CDK7i downregulated a pathogenic gene expression signature in synovial explants from arthritis patients. We propose that interfering with Pol II pausing by targeting CDK7 represents a novel therapeutic opportunity for inflammatory diseases.

ORGANISM(S): Mus musculus Homo sapiens

PROVIDER: GSE255372 | GEO | 2025/01/29

REPOSITORIES: GEO

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Targeting CDK7 function in the RNA Polymerase II transcription cycle in inflammatory arthritis

Project description:Macrophages are main drivers of inflammation and tissue damage in autoimmune diseases including rheumatoid arthritis1-4. The rate-limiting step for transcription of >70% of inducible genes in macrophages is RNA Polymerase II (Pol II) promoter-proximal pause release5-7, yet, the specific role of Pol II pausing in inflammation or whether it can be modulated therapeutically is unknown. Genetic ablation of a pause-stabilizing negative elongation factor (NELF) in macrophages enhanced the transcriptional response of paused anti-inflammatory genes to LPS, followed by secondary attenuation of inflammatory signaling, and reduced severity of K/BxN-serum transfer (ST) arthritis in mice. To disrupt Pol II pause establishment pharmacologically, we employed covalent inhibitors of the TFIIH-associated cyclin-dependent kinase (CDK) 7, THZ1 and YKL-5-124. Both dramatically reduced Pol II pausing in murine and human macrophages, broadly suppressed induction of pro- but not anti-inflammatory genes, and rapidly reversed pre-established inflammatory macrophage polarization by TNF+IFNγ. In vivo, CDK7i ameliorated the acute K/BxN-ST and chronic progressive hTNF-transgenic arthritis in mice. Finally, CDK7i downregulated a pathogenic gene expression signature in synovial explants from arthritis patients. We propose that interfering with Pol II pausing by targeting CDK7 represents a novel therapeutic opportunity for inflammatory diseases.

2025-01-29 | GSE255108 | GEO

TFIID enables RNA polymerase II promoter-proximal pausing

Project description:RNA polymerase II (pol II) transcribes all protein-coding and many non-coding RNAs in the human genome. Pol II transcription initiation is governed by the Pre-Initiation Complex (PIC), which contains TFIIA, TFIIB, TFIID, TFIIE, TFIIF, TFIIH, pol II, and Mediator. After initiation, pol II enzymes typically pause after transcribing less than 100 bases, and paused polymerases represent a common regulatory intermediate. Accordingly, paused pol II has been implicated in enhancer function, development and homeostasis, and diseases ranging from cancer to viral pathogenesis. Precisely how pol II promoter-proximal pausing is enforced and regulated remains unclear; however, protein complexes such as NELF and DSIF increase pausing whereas the activity of CDK9 (P-TEFb complex) correlates with pause release. To address specific mechanistic questions about pol II pausing and its regulation, we reconstituted human pol II promoter-proximal pausing in vitro, entirely with purified factors (no extracts). As expected, NELF and DSIF increased pol II pausing in vitro, whereas P-TEFb promoted pause release. Unexpectedly, the PIC alone was sufficient to reconstitute pol II pausing, suggesting that pausing is an inherent property of the PIC. In agreement, pol II pausing was lost upon replacement of the TFIID complex with TATA-binding protein (TBP); moreover, pausing was dependent upon TFIID subunits TAF1 and TAF2. TAF1/2 bind genomic DNA downstream of the pol II initiation site, invoking a “complex interaction” model for pausing. Consistent with this model, PRO-Seq experiments revealed increased transcription upon acute depletion (t=60 min) of TAF1 and TAF2 in human cells, and pol II pausing was disrupted at thousands of genes. Similar results were obtained in TAF1-depleted Drosophila S2 cells. Collectively, these data establish the general transcription factor TFIID as a genome-wide regulator of pol II promoter-proximal pausing.

2020-05-28 | GSE132764 | GEO

Paused RNA polymerase II inhibits new transcriptional initiation [ChIP-Seq]

Project description:RNA polymerase II (Pol II) pauses downstream of the transcription initiation site before beginning productive elongation. This pause is a key component of metazoan gene expression regulation. Some promoters have a strong disposition for Pol II pausing and often mediate faster, more synchronous changes in expression. This requires multiple rounds of transcription and thus cannot rely solely on pause release. But it is unclear how pausing affects the initiation of new transcripts during consecutive rounds of transcription. Using our recently developed ChIP-nexus method, we find that Pol II pausing inhibits new initiation. We propose that paused Pol II helps prevent new initiation between transcription bursts, which may reduce noise.

2017-04-17 | GSE85740 | GEO

Paused RNA polymerase II inhibits new transcriptional initiation

2017-04-17 | GSE85741 | GEO

Paused RNA polymerase II inhibits new transcriptional initiation [ChIP-nexus spike-in]

2017-04-17 | GSE85739 | GEO

Paused RNA polymerase II inhibits new transcriptional initiation [ChIP-nexus]

2017-04-17 | GSE85738 | GEO

The pause-initiation limit restricts transcription activation in human cells

Project description:Eukaryotic gene transcription is often controlled at the level of RNA polymerase II (Pol II) pausing in the promoter-proximal region. Pausing Pol II limits the frequency of transcription initiation (‘pause-initiation limit’), predicting that the pause duration must be decreased for transcriptional activation. To test this prediction, we conducted a genome-wide kinetic analysis of the heat shock response in human cells. We show that the pause-initiation limit restricts transcriptional activation at most genes. Gene activation generally requires the activity of the P-TEFb kinase CDK9, which decreases the duration of Pol II pausing and thereby enables an increase in the productive initiation frequency. The transcription of enhancer elements is generally not pause-limited and can be activated without CDK9 activity. Our results define the kinetics of Pol II transcriptional regulation in human cells at all gene classes during a natural transcription response.

2019-07-10 | GSE123980 | GEO

SPT6 functions in transcriptional pause/release via PAF1C recruitment

Project description:In vitro studies identified various factors including P-TEFb, SEC, SPT6, PAF1, DSIF, and NELF functioning at different stages of transcription elongation driven by RNA polymerase II (RNA Pol II). What remains unclear is how these factors cooperatively regulate pause/release and productive elongation in the context of living cells. Using an acute 5 protein-depletion approach, prominent release and a subsequent increase in mature transcripts, whereas long genes fail to yield mature transcripts due to a loss of processivity. Mechanistically, loss of SPT6 results in loss of PAF1 complex (PAF1C) from RNA Pol II, leading to NELF-bound RNA Pol II release into the gene bodies. Furthermore, SPT6 and/or PAF1 depletion impairs heat shock-induced pausing, pointing to a role for SPT6 in regulating RNA Pol II pause/release through the recruitment of PAF1C during the early elongation.

2022-08-09 | PXD033771 | Pride

LEDGF/p75 promotes transcriptional pausing through preventing SPT5 phosphorylation

Project description:The transcriptional progression is regulated by SPT5, which is involved in both promoter-proximal RNA polymerase II (Pol II) pausing and elongation, which serve as rate-limiting steps in metazoan. However, the mechanism for SPT5 coordinating these processes remains unclear. Here we report that the disordered sub-regions within SPT5 contain a prion-like domain (PLD) that is required for Pol II pausing, while the phosphorylation site-rich domain (PRD) is essential for transcript elongation. Mechanically, SPT5-PLD helps stabilize Pol II pausing by preventing SPT5-PRD phosphorylation mediated by the super elongation complex (SEC). SPT5-PLD also maintains Pol II pausing by recruiting a newly identified transcriptional pause regulator, PSIP1, which inhibits phosphorylation required for elongation. Additionally, SPT5-PLD prevents premature release of Pol II pausing through PSIP1’s IBD domain by counteracting SEC. Our results demonstrate that SPT5 possesses intrinsic characteristics that balance the transcriptional process by preventing premature pause release and promoting progression to elongation.

2025-01-08 | GSE250380 | GEO

RNA Polymerase II pausing temporally coordinates cell cycle progression and erythroid differentiation [RNA-seq]

Project description:The controlled release of promoter-proximal RNA polymerase II (Pol II) pausing into productive elongation is a major step in gene regulation. Yet, functionally analyzing Pol II pausing is difficult because the factors that regulate pause release are generally essential. Here, we identified heterozygous loss-of-function mutations in SUPT5H, encoding SPT5, in individuals with β-thalassemia trait unlinked to the β-globin locus. Recapitulating the pathogenic mutations in human erythroid cells or acute treatment with transcription inhibitors replicates the patient phenotype of altered globin gene expression. Furthermore, in SUPT5H-edited cells, Pol II pause release was globally disrupted. We observed dynamic patterns of pausing at cell cycle and erythroid differentiation genes at the transition from progenitors to precursors during erythropoiesis. At this same transition, in SUPT5H-edited cells, we observed delayed differentiation and altered cell cycle kinetics, as well as a delay in the onset of gene expression programs. Therefore, hindering pause release perturbs cell cycle and delays differentiation at key stages of erythropoiesis, revealing a role for Pol II pausing in the temporal coordination between the cell cycle and differentiation.

2023-07-21 | GSE214558 | GEO

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