Mus musculus
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA182902 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR628315_1.fastq.gz | Fastqsanger.gz | |||
| SRR628315_2.fastq.gz | Fastqsanger.gz | |||
| SRR628316_1.fastq.gz | Fastqsanger.gz | |||
| SRR628316_2.fastq.gz | Fastqsanger.gz | |||
| SRR628317_1.fastq.gz | Fastqsanger.gz |
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Project description:The Aurora B kinase and the polycomb protein Ring1B combine to regulate active promoters in quiescent lymphocytes
| PRJNA182901 | ENA
Project description:The Aurora B kinase and the polycomb protein Ring1B combine to regulate active promoters in quiescent lymphocytes [ChIP-seq]
| PRJNA182903 | ENA
Project description:Polycomb repressive complex PRC1 is essential for gene regulation in numerous cell fate decisions. We show that RING1B (RING2, RNF2) and canonical PRC1 (cPRC1) genes are amplified and overexpressed in breast cancer (BC). Moreover, cPRC1 complexes functionally associate with genes regulated by cell type specific key transcription factors such as estrogen receptor (ER) in ER+ tumor cells and BRD4 in triple negative BC cells. cPRC1 is recruited to active enhancers in a manner independent of PRC2 and RING1B enzymatic activity. RING1B regulates enhancer activity and gene transcription not only by promoting the expression of BC oncogenes but also by regulating chromatin accessibility for oncogenic transcription factors. RING1B recruitment, and thus PRC1 association, to active enhancers occurs in multiple cancers.
2018-10-19 | PXD009570 | Pride
Project description:NguyenLK2011 - Ubiquitination dynamics in
Ring1B-Bmi1 system
This theoretical model investigates the
dynamics of Ring1B/Bmi1 ubiquitination to identify bistable
switch-like and oscillatory behaviour in the
system. Michaelis-Menten (MM) equations are used to formulate
the model. However, the authors show that the dynamics persist even
for Mass-Action kinetics. This SBML file is the MM version of the
model.
This model is described in the article:
Switches,
excitable responses and oscillations in the Ring1B/Bmi1
ubiquitination system.
Nguyen LK, Muñoz-García J,
Maccario H, Ciechanover A, Kolch W, Kholodenko BN.
PLoS Comput. Biol. 2011 Dec; 7(12):
e1002317
Abstract:
In an active, self-ubiquitinated state, the Ring1B ligase
monoubiquitinates histone H2A playing a critical role in
Polycomb-mediated gene silencing. Following ubiquitination by
external ligases, Ring1B is targeted for proteosomal
degradation. Using biochemical data and computational modeling,
we show that the Ring1B ligase can exhibit abrupt switches,
overshoot transitions and self-perpetuating oscillations
between its distinct ubiquitination and activity states. These
different Ring1B states display canonical or multiply branched,
atypical polyubiquitin chains and involve association with the
Polycomb-group protein Bmi1. Bistable switches and oscillations
may lead to all-or-none histone H2A monoubiquitination rates
and result in discrete periods of gene (in)activity. Switches,
overshoots and oscillations in Ring1B catalytic activity and
proteosomal degradation are controlled by the abundances of
Bmi1 and Ring1B, and the activities and abundances of external
ligases and deubiquitinases, such as E6-AP and USP7.
This model is hosted on
BioModels Database
and identified by:
BIOMD0000000622.
To cite BioModels Database, please use:
BioModels Database:
An enhanced, curated and annotated resource for published
quantitative kinetic models.
To the extent possible under law, all copyright and related or
neighbouring rights to this encoded model have been dedicated to
the public domain worldwide. Please refer to
CC0
Public Domain Dedication for more information.
2024-09-02 | BIOMD0000000622 | BioModels
Project description:Polycomb complexes have traditionally been prescribed roles as transcriptional repressors, though increasing evidence demonstrate they can also activate gene expression. However, the mechanisms underlying positive gene regulation mediated by Polycomb proteins are poorly understood. Here, we show that RING1B, a core component of Polycomb Repressive Complex 1, regulates enhancer-promoter interaction of the bona fide estrogen-activated GREB1 gene. Systematic characterization of RNA:DNA hybrid formation (R-loops), nascent transcription, and RNA Pol II activity upon estrogen administration revealed a key role of RING1B in gene activation by regulating R-loop formation and RNA Pol II elongation. We also found that the estrogen receptor (ER) and RNA are both necessary for full RING1B recruitment to estrogen-activated genes. Notably, RING1B recruitment was mostly unaffected upon RNA Pol II depletion by triptolide. Our findings delineate the functional interplay between RING1B, RNA, and ER to safeguard chromatin architecture perturbations required for estrogen-mediated gene regulation, and highlight the crosstalk between steroid hormones and Polycomb proteins to regulate oncogenic programs.
2021-09-29 | GSE173860 | GEO
Project description:The Polycomb repressive complexes PRC1 and PRC2 play an essential role in cell fate decisions, embryonic development and gene regulation. While the functions of PRC2 in cancer are under intense study, the function of PRC1 in cancer remains largely unexplored. Here, we show that RNF2, the gene encoding RING1B, and canonical PRC1 (cPRC1) genes are amplified and overexpressed in breast cancer. Specifically, in estrogen receptor positive (ER+) breast cancer cells, cPRC1 is functionally associated with enhancers and genes regulated by ERa, while in triple negative breast cancer (TNBC) cells, a different cPRC1 variant is recruited to enhancers and promoters occupied by the bromodomain protein BRD4. Mechanistically, cPRC1 complexes are recruited to active enhancers independently of PRC2 and RING1B enzymatic activity. Moreover, RING1B has a dual role in regulating enhancer activity and gene transcription as it is recruited to enhancers to maintain and promote gene expression of breast cancer oncogenes. We also show that RING1B regulates chromatin accessibility of oncogenic transcription factors. Finally, we provide evidence that association of PRC1 to active enhancers is not restricted to breast cancer, demonstrating that RING1B recruitment to transcriptionally active sites occurs in multiple cancer types. Our work highlights a non-classical function of cPRC1 complexes in regulating specific oncogenic programs in cancer through its association with enhancer regions.
2018-08-30 | GSE107176 | GEO
Project description:Polycomb Repressive Complexes 1 and 2 (PRC1 and PRC2) are histone-modifying and -binding complexes that mediate the formation of facultative heterochromatin and are required for silencing of developmental genes and maintenance of cell fate. Multiple pathways of RNA decay work together to establish and maintain heterochromatin in fission yeast, including a recently identified role for a conserved RNA degradation complex called the rixosome or RIX1 complex. Whether RNA degradation also plays a role in the stability of mammalian heterochromatin remains unknown. Here we show that the rixosome contributes to silencing of many Polycomb targets in human cells. The rixosome associates with human PRC complexes and is enriched at promoters of Polycomb target genes. Importantly, depletion of either the rixosome or Polycomb results in accumulation of paused and elongating RNA polymerase at Polycomb-target genes. We identify point mutations in the RING1B subunit of PRC1 that disrupt the interaction between PRC1 and the rixosome and result in diminished silencing, suggesting that direct recruitment of the rixosome to chromatin is required for silencing. Finally, we show that the RNA kinase activity of the rixosome and the XRN2 exoribonuclease, which degrades RNAs with 5’ mono-phosphate groups generated by the rixosome, are required for silencing. Our findings suggest that rixosome-mediated degradation of nascent RNA is conserved from fission yeast to human, although in human cells the rixosome degrades RNA in facultative rather than constitutive heterochromatin.
2022-01-19 | PXD027966 | Pride
Project description:Polycomb Repressive Complexes 1 and 2 (PRC1 and PRC2) are histone-modifying and -binding complexes that mediate the formation of facultative heterochromatin and are required for silencing of developmental genes and maintenance of cell fate. Multiple pathways of RNA decay work together to establish and maintain heterochromatin in fission yeast, including a recently identified role for a conserved RNA degradation complex called the rixosome or RIX1 complex. Whether RNA degradation also plays a role in the stability of mammalian heterochromatin remains unknown. Here we show that the rixosome contributes to silencing of many Polycomb targets in human cells. The rixosome associates with human PRC complexes and is enriched at promoters of Polycomb target genes. Importantly, depletion of either the rixosome or Polycomb results in accumulation of paused and elongating RNA polymerase at Polycomb-target genes. We identify point mutations in the RING1B subunit of PRC1 that disrupt the interaction between PRC1 and the rixosome and result in diminished silencing, suggesting that direct recruitment of the rixosome to chromatin is required for silencing. Finally, we show that the RNA kinase activity of the rixosome and the XRN2 exoribonuclease, which degrades RNAs with 5’ mono-phosphate groups generated by the rixosome, are required for silencing. Our findings suggest that rixosome-mediated degradation of nascent RNA is conserved from fission yeast to human, although in human cells the rixosome degrades RNA in facultative rather than constitutive heterochromatin.
2022-01-20 | PXD029403 | Pride
Project description:Genome-wide distribution of proteins and histone marks in CD43 negative mouse resting B cells ChIP-seq analyses of Aurora B, Ring1B, Bcx7, USP16, H3K27me3, and Ezh2 were carried out on wild-typeCD43 negative resting B cells. ChIP-seq datasets obtained from Aurora B knockout and RingiB knockout cells were used as negative controls to validate the signals for Aurora B and Ring1B from wild-type cells. 8WG16 ChIP-seq datasets were generated from WT (Cre-ERt2 homozygous) and Ring1B KO (Cre-ERt2/Rnf2 flox homozygous). RNAP-S5ph ChIP-seq datasets were generated from WT (Cre-ERt2 homozygous) and Aurkb KO (Cre-ERt2/Aurkb flox homozygous). ChIP-seq analyses of H3S28 phosphorylation (H3S28ph) and H2AK119 monoubiquitination (H2Aub1) in wild-type (Cre-ERt2 homozygous) and Aurora B KO (Cre-ERt2/Aurkb flox homozygous) CD43 negative resting B cells treated with 250nM tamoxifen (4-hydroxytamoxifen) for 48 hours. ChIP-seq analyses of the levels of unphosphorylated RNA Pol II (8WG16) and serine 5-phosphorylated RNA Pol II (RNAP-S5ph) were conducted in Aurkb KO (Cre-ERt2/Aurkb flox homozygous) and Ring1B KO (Cre-ERt2/Rnf2 flox homozygous) CD43 negative resting B cells treated with 250nM tamoxifen (4-hydroxytamoxifen) for 48 hours respectively). All libraries were prepared from sonicated, formaldehyde-crossilinked chromatin. For H2Aub1, ChIP was performed using micrococcal nuclease-digested, unfixed chromatin, instead.
2013-09-27 | E-GEOD-42705 | biostudies-arrayexpress
Project description:Polycomb repressive complex 1 (PRC1) catalyzes H2A monoubiquitination (uH2A) and regulates pluripotency in embryonic stem cells (ESCs). However the mechanisms controlling PRC1 recruitment and activity are largely unknown. Here we show that Fbxl10 interacts with Ring1B and Nspc1, forming a non-canonical PRC1. We demonstrate that Fbxl10-PRC1 is essential for H2A ubiquitination in mouse ESCs. Genome-wide analyses reveal that Fbxl10 preferentially binds to CpG islands and co-localizes with Ring1B on Polycomb target genes. Notably, Fbxl10 depletion causes modest dissociation of Ring1B but a major loss of uH2A on target genes. Furthermore rescue experiments for Fbxl10 reveal that its DNA binding capability and integration into PRC1 are required for proper H2A ubiquitination. ES cells lacking Fbxl10, like previously characterized Polycomb mutants, show a severely compromised capacity for successful differentiation. Our results shed light on a novel mechanism how CpG islands regulate chromatin function by affecting polycomb recruitment and activity. All ChIP-seq reactions were performed in either untransfected cells, cells expressing scrambled shRNA or Fbxl10 shRNA, Ring1b-/- or Suz12-/- mouse ES cells
2012-12-31 | E-GEOD-37930 | biostudies-arrayexpress