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The DREAM complex antagonizes WDR5a and represses the productive elongation of transcription in Arabidopsis

ABSTRACT: This SuperSeries is composed of the SubSeries listed below.

ORGANISM(S): Arabidopsis thaliana

PROVIDER: GSE181489 | GEO | 2022/06/27

REPOSITORIES: GEO

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The DREAM complex antagonizes WDR5a and represses the productive elongation of transcription in Arabidopsis [GRO-seq]

Project description:The master transcriptional repressor DREAM (dimerization partner, RB-like, E2F and multi-vulval class B) complex regulates cell cycle in eukaryotes, but much remains unknown about how it transmits repressive signals on chromatin to the primary transcriptional machinery (e.g., Pol II). Through a genetic screen, we identified BTE1 (barrier of transcription elongation 1), a key component in the plant DREAM complex. The subsequent characterization demonstrated that the DREAM complex represses Pol II elongation. The core DREAM subunits E2F transcription factors recruit BTE1 to accumulate at the promoter-proximal regions of target genes. DREAM target genes exhibit characteristic enrichment of H2A.Z and H3K4me2 modification on chromatin. The DREAM complex BTE1 subunit interacts with WDR5a, repressing WDR5a chromatin binding and the productive elongation of transcription on BTE1-targeted genomic loci. Thus, we demonstrate a major role of DREAM complex in the control of transition from transcription initiation to productive elongation around TSSs on the open chromatin via inhibiting WDR5a function.

2022-06-28 | GSE181488 | GEO

The DREAM complex antagonizes WDR5a and represses the productive elongation of transcription in Arabidopsis [ChIP-seq]

2022-06-28 | GSE181486 | GEO

The DREAM complex antagonizes WDR5a and represses the productive elongation of transcription in Arabidopsis [RNA-seq]

2022-06-28 | GSE181484 | GEO

The DREAM complex antagonizes WDR5a and represses the productive elongation of transcription in Arabidopsis

Project description:The DREAM complex antagonizes WDR5a and represses the productive elongation of transcription in Arabidopsis

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The DREAM complex antagonizes WDR5a and represses the productive elongation of transcription in Arabidopsis [ChIP-seq]

Project description:The DREAM complex antagonizes WDR5a and represses the productive elongation of transcription in Arabidopsis [ChIP-seq]

| PRJNA752161 | ENA

The DREAM complex antagonizes WDR5a and represses the productive elongation of transcription in Arabidopsis [RNA-seq]

Project description:The DREAM complex antagonizes WDR5a and represses the productive elongation of transcription in Arabidopsis [RNA-seq]

| PRJNA752148 | ENA

The DREAM complex antagonizes WDR5a and represses the productive elongation of transcription in Arabidopsis [GRO-seq]

Project description:The DREAM complex antagonizes WDR5a and represses the productive elongation of transcription in Arabidopsis [GRO-seq]

| PRJNA752163 | ENA

The DREAM complex represses growth in response to DNA damage in Arabidopsis.

Project description:The DNA of all organisms is constantly damaged by physiological processes and environmental conditions. Upon persistent damage, plant growth and cell proliferation are reduced. Based on previous findings that RBR1, the only Arabidopsis homolog of the mammalian tumor suppressor gene retinoblastoma, plays a key role in the DNA damage response in plants, we unravel here the network of RBR1 interactors under DNA stress conditions. This led to the identification of homologs of every DREAM component in Arabidopsis, including previously not recognized homologs of LIN52. Interestingly, we also discovered NAC044, a mediator of DNA damage response in plants and close homolog of the major DNA damage regulator SOG1, to directly interact with RBR1 and the DREAM component LIN37B. Consistently, not only mutants in NAC044 but also the double mutant of the two LIN37 homologs and mutants for the DREAM component E2FB showed reduced sensitivities to DNA-damaging conditions. Our work indicates the existence of multiple DREAM complexes that work in conjunction with NAC044 to mediate growth arrest after DNA damage.

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Transcription factor Sp3 represses expression of p21CIP¹ via inhibition of productive elongation by RNA polymerase II.

Project description:Like that of many protein-coding genes, expression of the p21(CIP1) cell cycle inhibitor is regulated at the level of transcription elongation. While many transcriptional activators have been shown to stimulate elongation, the mechanisms by which promoter-specific repressors regulate pausing and elongation by RNA polymerase II (RNA PolII) are not well described. Here we report that the transcription factor Sp3 inhibits basal p21(CIP1) gene expression by promoter-bound RNA PolII. Knockdown of Sp3 led to increased p21(CIP1) mRNA levels and reduced occupancy of the negative elongation factor (NELF) at the p21(CIP1) promoter, although the level of binding of the positive transcription elongation factor b (P-TEFb) kinase was not increased. Sp3 depletion correlated with increased H3K36me3 and H2Bub1, two histone modifications associated with transcription elongation. Further, Sp3 was shown to promote the binding of protein phosphatase 1 (PP1) to the p21(CIP1) promoter, leading to reduced H3S10 phosphorylation, a finding consistent with Sp3-dependent regulation of the local balance between kinase and phosphatase activities. Analysis of other targets of Sp3-mediated repression suggests that, in addition to previously described SUMO modification-dependent chromatin-silencing mechanisms, inhibition of the transition of paused RNA PolII to productive elongation, described here for p21(CIP1), is a general mechanism by which transcription factor Sp3 fine-tunes gene expression.

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The transcription factor DREAM represses the deubiquitinase A20 and mediates inflammation.

Project description:Here we found that the transcription repressor DREAM bound to the promoter of the gene encoding A20 to repress expression of this deubiquitinase that suppresses inflammatory NF-κB signaling. DREAM-deficient mice displayed persistent and unchecked A20 expression in response to endotoxin. DREAM functioned by transcriptionally repressing A20 through binding to downstream regulatory elements (DREs). In contrast, binding of the transcription factor USF1 to the DRE-associated E-box domain in the gene encoding A20 activated its expression in response to inflammatory stimuli. Our studies define the critical opposing functions of DREAM and USF1 in inhibiting and inducing A20 expression, respectively, and thereby the strength of NF-κB signaling. Targeting of DREAM to induce USF1-mediated A20 expression is therefore a potential anti-inflammatory strategy for the treatment of diseases associated with unconstrained NF-κB activity, such as acute lung injury.

| S-EPMC4005385 | biostudies-literature

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