TRB and PRC2
Ontology highlight
ABSTRACT:
PROVIDER: PRJEB19936 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| ERR1880970.fastq.gz | Fastqsanger.gz | |||
| ERR1880967.fastq.gz | Fastqsanger.gz | |||
| ERR1880968.fastq.gz | Fastqsanger.gz | |||
| ERR1880969.fastq.gz | Fastqsanger.gz | |||
| ERR2352510.fastq.gz | Fastqsanger.gz |
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Project description:Arabidopsis telomeric repeat binding factors (TRBs) can bind telomeric DNA sequences to protect telomeres from degradation. TRBs can also recruit Polycomb Repressive Complex 2 (PRC2) to deposit tri-methylation of H3 lysine 27 (H3K27me3) over certain target loci. Here, we demonstrate that TRBs also associate and colocalize with JUMONJI14 (JMJ14) and trigger H3K4me3 demethylation at some loci. The trb1/2/3 triple mutant and the jmj14-1 mutant show an increased level of H3K4me3 over TRB and JMJ14 binding sites, resulting in up-regulation of their target genes. Furthermore, tethering TRBs to the promoter region of genes with an artificial zinc finger (TRB-ZF) successfully triggers target gene silencing, as well as H3K27me3 deposition, and H3K4me3 removal. Interestingly, JMJ14 is predominantly recruited to ZF off-target sites with low levels of H3K4me3, which is accompanied with TRB-ZFs triggered H3K4me3 removal at these loci. These results suggest that TRB proteins coordinate PRC2 and JMJ14 activities to repress target genes via H3K27me3 deposition and H3K4me3 removal.
2023-02-22 | MSV000091349 | MassIVE
Project description:TELOMERE REPEAT BINDING proteins (TRBs) are plant specific transcriptional regulators that combine two DNA binding domains: the GH1 domain shared with H1 linker histones and the Myb/SANT domain that specifically recognize AAACCCT, the telomeric motif, present at telomeres, centromere-proximal Interstitial Telomeric Repeats (ITRs) and at promoters of numerous protein-coding genes. TRB1, TRB2 and TRB3 (TRB1-3) proteins collaborate with PRC2 and JMJ14 for deposition of H3K27me3 and removal of H3K4me3 to induce transcriptional repression in a functionally redundant manner. Here we report that TRB4 and TRB5, which belong to a separate TRB clade conserved among spermatophytes, fulfill chromatin roles distinct from TRB1-3. We show that TRB4 and TRB5 are involved in the transcriptional control of several hundred genes involved in developmental responses to environmental cues and in consequence TRB4 and TRB5 loss of function plants present developmental growth defects including delayed flowering. Most of the trb4 trb5 transcriptomic defects differ from those of trb1 trb2 trb3, suggesting a distinct mode of action at the chromatin level. Indeed, TRB4 binds to several thousand sites in the genome, mainly to TSS and promoter regions of transcriptionally active and H3K4me3-marked genes, but it does not affect global H3K4me3 levels. In contrast to TRB1-3, TRB4 is not enriched at H3K27me3-marked gene bodies, and combined loss of TRB4 and TRB5 affects H3K27me3 only at a small subset of genes. Yet, TRB4 physically interacts with the catalytically active subunit of somatic PRC2 complexes CURLY LEAF (CLF). Unexpectedly, loss of TRB4 and TRB5 partially suppresses developmental defects of clf mutant plants, likely through their role as positive transcriptional regulators of the key flowering genes SOC1 and FT. We further show that TRB4 and TRB1 share multiple target genes and reveal physical and genetic interactions between TRBs of the two distinct clades, altogether unveiling that TRB proteins engage in both positive and negative interplay with other members of the family to regulate plant development through PRC2-dependent and independent mechanisms.
2024-02-12 | GSE237158 | GEO
Project description:TELOMERE REPEAT BINDING proteins (TRBs) are plant specific transcriptional regulators that combine two DNA binding domains: the GH1 domain shared with H1 linker histones and the Myb/SANT domain that specifically recognize AAACCCT, the telomeric motif, present at telomeres, centromere-proximal Interstitial Telomeric Repeats (ITRs) and at promoters of numerous protein-coding genes. TRB1, TRB2 and TRB3 (TRB1-3) proteins collaborate with PRC2 and JMJ14 for deposition of H3K27me3 and removal of H3K4me3 to induce transcriptional repression in a functionally redundant manner. Here we report that TRB4 and TRB5, which belong to a separate TRB clade conserved among spermatophytes, fulfill chromatin roles distinct from TRB1-3. We show that TRB4 and TRB5 are involved in the transcriptional control of several hundred genes involved in developmental responses to environmental cues and in consequence TRB4 and TRB5 loss of function plants present developmental growth defects including delayed flowering. Most of the trb4 trb5 transcriptomic defects differ from those of trb1 trb2 trb3, suggesting a distinct mode of action at the chromatin level. Indeed, TRB4 binds to several thousand sites in the genome, mainly to TSS and promoter regions of transcriptionally active and H3K4me3-marked genes, but it does not affect global H3K4me3 levels. In contrast to TRB1-3, TRB4 is not enriched at H3K27me3-marked gene bodies, and combined loss of TRB4 and TRB5 affects H3K27me3 only at a small subset of genes. Yet, TRB4 physically interacts with the catalytically active subunit of somatic PRC2 complexes CURLY LEAF (CLF). Unexpectedly, loss of TRB4 and TRB5 partially suppresses developmental defects of clf mutant plants, likely through their role as positive transcriptional regulators of the key flowering genes SOC1 and FT. We further show that TRB4 and TRB1 share multiple target genes and reveal physical and genetic interactions between TRBs of the two distinct clades, altogether unveiling that TRB proteins engage in both positive and negative interplay with other members of the family to regulate plant development through PRC2-dependent and independent mechanisms.
2024-02-12 | GSE237185 | GEO
Project description:TELOMERE REPEAT BINDING proteins (TRBs) are plant specific transcriptional regulators that combine two DNA binding domains: the GH1 domain shared with H1 linker histones and the Myb/SANT domain that specifically recognize AAACCCT, the telomeric motif, present at telomeres, centromere-proximal Interstitial Telomeric Repeats (ITRs) and at promoters of numerous protein-coding genes. TRB1, TRB2 and TRB3 (TRB1-3) proteins collaborate with PRC2 and JMJ14 for deposition of H3K27me3 and removal of H3K4me3 to induce transcriptional repression in a functionally redundant manner. Here we report that TRB4 and TRB5, which belong to a separate TRB clade conserved among spermatophytes, fulfill chromatin roles distinct from TRB1-3. We show that TRB4 and TRB5 are involved in the transcriptional control of several hundred genes involved in developmental responses to environmental cues and in consequence TRB4 and TRB5 loss of function plants present developmental growth defects including delayed flowering. Most of the trb4 trb5 transcriptomic defects differ from those of trb1 trb2 trb3, suggesting a distinct mode of action at the chromatin level. Indeed, TRB4 binds to several thousand sites in the genome, mainly to TSS and promoter regions of transcriptionally active and H3K4me3-marked genes, but it does not affect global H3K4me3 levels. In contrast to TRB1-3, TRB4 is not enriched at H3K27me3-marked gene bodies, and combined loss of TRB4 and TRB5 affects H3K27me3 only at a small subset of genes. Yet, TRB4 physically interacts with the catalytically active subunit of somatic PRC2 complexes CURLY LEAF (CLF). Unexpectedly, loss of TRB4 and TRB5 partially suppresses developmental defects of clf mutant plants, likely through their role as positive transcriptional regulators of the key flowering genes SOC1 and FT. We further show that TRB4 and TRB1 share multiple target genes and reveal physical and genetic interactions between TRBs of the two distinct clades, altogether unveiling that TRB proteins engage in both positive and negative interplay with other members of the family to regulate plant development through PRC2-dependent and independent mechanisms.
2024-02-12 | GSE253005 | GEO
Project description:TELOMERE REPEAT BINDING proteins (TRBs) are plant specific transcriptional regulators that combine two DNA binding domains: the GH1 domain shared with H1 linker histones and the Myb/SANT domain that specifically recognize AAACCCT, the telomeric motif, present at telomeres, centromere-proximal Interstitial Telomeric Repeats (ITRs) and at promoters of numerous protein-coding genes. TRB1, TRB2 and TRB3 (TRB1-3) proteins collaborate with PRC2 and JMJ14 for deposition of H3K27me3 and removal of H3K4me3 to induce transcriptional repression in a functionally redundant manner. Here we report that TRB4 and TRB5, which belong to a separate TRB clade conserved among spermatophytes, fulfill chromatin roles distinct from TRB1-3. We show that TRB4 and TRB5 are involved in the transcriptional control of several hundred genes involved in developmental responses to environmental cues and in consequence TRB4 and TRB5 loss of function plants present developmental growth defects including delayed flowering. Most of the trb4 trb5 transcriptomic defects differ from those of trb1 trb2 trb3, suggesting a distinct mode of action at the chromatin level. Indeed, TRB4 binds to several thousand sites in the genome, mainly to TSS and promoter regions of transcriptionally active and H3K4me3-marked genes, but it does not affect global H3K4me3 levels. In contrast to TRB1-3, TRB4 is not enriched at H3K27me3-marked gene bodies, and combined loss of TRB4 and TRB5 affects H3K27me3 only at a small subset of genes. Yet, TRB4 physically interacts with the catalytically active subunit of somatic PRC2 complexes CURLY LEAF (CLF). Unexpectedly, loss of TRB4 and TRB5 partially suppresses developmental defects of clf mutant plants, likely through their role as positive transcriptional regulators of the key flowering genes SOC1 and FT. We further show that TRB4 and TRB1 share multiple target genes and reveal physical and genetic interactions between TRBs of the two distinct clades, altogether unveiling that TRB proteins engage in both positive and negative interplay with other members of the family to regulate plant development through PRC2-dependent and independent mechanisms.
2024-02-12 | GSE236267 | GEO
Project description:Histone marks H3K27me3 and H3K4me3 are mutual exclusive over plant genome, however, the underlying mechanism is not fully understood. Arabidopsis telomeric repeat binding factors (TRBs) are required for the deposition of H3K27me3 by recruiting Polycomb repressive complexes (PRCs). Here, we demonstrate that TRBs associate and colocalize with JUMONJI 14 (JMJ14) over gene body regions and trigger H3K4me3 demethylation. The trb1/2/3 triple mutant and jmj14-1 mutant show an increased level of H3K4me3 over TRB and JMJ14 binding sites, resulting in up-regulation of their targeting genes. Furthermore, tethering TRBs to the promoter region of genes with an artificial zinc finger successfully triggers target gene silencing. These results suggest that TRB proteins cooperate with PRC2 and JMJ14 complex to repress target gene by H3K4me3 demethylation and H3K27me3 deposition.
2023-02-12 | GSE204681 | GEO
Project description:The Polycomb repressive complex 2 (PRC2) catalyzes histone H3 Lys27 trimethylation (H3K27me3) to repress gene transcription in multicellular eukaryotes. Despite its importance in gene silencing and cellular differentiation, how PRC2 is recruited to target loci is still not fully understood. Here, we report genome-wide evidence for the recruitment of PRC2 by the transcriptional repressors VIVIPAROUS1/ABI3-LIKE1 (VAL1) and VAL2 in Arabidopsis thaliana. We show that the val1 val2 double mutant possesses somatic embryonic phenotypes and a transcriptome strikingly similar to those of the swn clf double mutant, which lacks the PRC2 catalytic subunits SWINGER (SWN) and CURLY LEAF (CLF). We further show that VAL1 and VAL2 physically interact with SWN and CLF in vivo. Genome-wide binding profiling demonstrated that they colocalize with SWN and CLF at PRC2 target loci. Loss of VAL1 and VAL2 significantly reduces SWN and CLF enrichment at PRC2 target loci and leads to a genome-wide redistribution of H3K27me3 that strongly affects transcription. Finally, we provide evidence that the VAL1/VAL2–RY regulatory system is largely independent of the TRB–Telobox and BPC1–GA/AZF1–Telobox modules for Polycomb silencing in plants. Taken together, our work demonstrates an extensive genome-wide interaction between VAL1/2 and PRC2 and provides mechanistic insights into the establishment of Polycomb silencing in plants.
2020-11-06 | GSE145387 | GEO
Project description:BACKGROUND: Polycomb group complexes PRC1 and PRC2 repress gene expression at the chromatin level in eukaryotes. The classic recruitment model of Polycomb group complexes in which PRC2-mediated H3K27 trimethylation recruits PRC1 for H2A monoubiquitination was recently challenged by data showing that PRC1 activity can also recruit PRC2. However, the prevalence of these two mechanisms is unknown, especially in plants as H2AK121ub marks were examined at only a handful of Polycomb group targets. RESULTS: By using genome-wide analyses, we show that H2AK121ub marks are surprisingly widespread in Arabidopsis thaliana, often co-localizing with H3K27me3 but also occupying a set of transcriptionally active genes devoid of H3K27me3. Furthermore, by profiling H2AK121ub and H3K27me3 marks in atbmi1a/b/c, clf/swn, and lhp1 mutants we found that PRC2 activity is not required for H2AK121ub marking at most genes. In contrast, loss of AtBMI1 function impacts the incorporation of H3K27me3 marks at most Polycomb group targets. CONCLUSIONS: Our findings show the relationship between H2AK121ub and H3K27me3 marks across the A. thaliana genome and unveil that ubiquitination by PRC1 is largely independent of PRC2 activity in plants, while the inverse is true for H3K27 trimethylation.
2017-03-21 | GSE89357 | GEO
Project description:BACKGROUND: Polycomb group complexes PRC1 and PRC2 repress gene expression at the chromatin level in eukaryotes. The classic recruitment model of Polycomb group complexes in which PRC2-mediated H3K27 trimethylation recruits PRC1 for H2A monoubiquitination was recently challenged by data showing that PRC1 activity can also recruit PRC2. However, the prevalence of these two mechanisms is unknown, especially in plants as H2AK121ub marks were examined at only a handful of Polycomb group targets. RESULTS: By using genome-wide analyses, we show that H2AK121ub marks are surprisingly widespread in Arabidopsis thaliana, often co-localizing with H3K27me3 but also occupying a set of transcriptionally active genes devoid of H3K27me3. Furthermore, by profiling H2AK121ub and H3K27me3 marks in atbmi1a/b/c, clf/swn, and lhp1 mutants we found that PRC2 activity is not required for H2AK121ub marking at most genes. In contrast, loss of AtBMI1 function impacts the incorporation of H3K27me3 marks at most Polycomb group targets. CONCLUSIONS: Our findings show the relationship between H2AK121ub and H3K27me3 marks across the A. thaliana genome and unveil that ubiquitination by PRC1 is largely independent of PRC2 activity in plants, while the inverse is true for H3K27 trimethylation.
2017-03-21 | GSE89356 | GEO
Project description:By using ChIP-seq, we found that loss of BRM activity in developing seedlings leads to ectopic and increased H3K27me3 deposition at several hundred genes, indicating the critical role of BRM in preventing the inappropriate deposition of this histone mark. Removal of CLF in brm mutant could partcially suppress the increased H3K27me3. Examination of H3K27me3 in 14-day-old wt, brm, clf, and brm clf seedlings. Two biological replicates for each one.
2015-03-09 | E-GEOD-53620 | biostudies-arrayexpress