Browse
Submit Data
Databases
API
Help

Dataset Information

0 Views

0 Connections

0 Citations

0 Reanalyses

0 Downloads

Omics score: 0

RNA-seq analysis about Hira/Ubn1/Ubn2 knocked down samples

ABSTRACT: Histone chaperones are responsible for the deposition and removal of histones in chromatin and critical to prevent the abnormal activation of retrotransposable elements, which can be harmful to genome stability. One of the important histone chaperones is HIRA complex, which consists of Hira, Ubn1/Ubn2, and Cabin1 and mediates the installment of H3.3-H4 to nucleosome. We studied the function of members of HIRA complex in suppressing ERVs and found that histone H3.3 are enriched on all three classes of ERVs. Different HIRA members act distinctly in silencing ERVs. Ubn2 represses Class III ERVs including MERVL and Hira mainly silences Class I and Class II ERVs. Hira is enriched on Class I and II ERVs whereas its depletion affects the recruitment of H3.3. In contrast, Ubn2 is enriched on Class III ERVs, while its depletion influences H3.3 deposition and H3K9 methylation. This study extends our understandings of the mechanism by novel factors regulates ERVs.

ORGANISM(S): Mus musculus

PROVIDER: GSE177026 | GEO | 2021/12/12

REPOSITORIES: GEO

ACCESS DATA

Json Xml

Dataset's files

Source:

			Action	DRS
		Other

Items per page:

1 - 1 of 1

Similar Datasets

Histone chaperone ASF1 mediates H3.3-H4 deposition in Arabidopsis

Project description:Histone chaperones and chromatin remodelers control nucleosome dynamics, essential for transcription, replication, and DNA repair. The histone chaperone Anti-Silencing Factor 1 (ASF1) plays a central role in facilitating CAF-1-mediated replication-dependent H3.1 deposition and HIRA-mediated replication-independent H3.3 deposition in yeast and metazoans. Whether ASF1 function is evolutionarily conserved in plants is unknown. Here, we show that Arabidopsis ASF1 proteins display an exclusive preference for the H3.3-depositing HIRA complex. Simultaneous mutation of both Arabidopsis ASF1 genes caused a decrease in chromatin density and ectopic H3.1 occupancy at loci typically enriched with H3.3. Genetic, transcriptomic, and proteomic data indicate that ASF1 proteins strongly prefer the HIRA complex over CAF-1. asf1 mutants also displayed an increase in spurious Pol II transcriptional initiation, and showed defects in the maintenance of gene body CG DNA methylation and in the distribution of histone modifications. Furthermore, ectopic targeting of ASF1 caused excessive histone deposition, less accessible chromatin, and gene silencing. These findings reveal the importance of ASF1-mediated H3.3-H4 deposition via the HIRA pathway for proper epigenetic regulation of the genome.

2022-10-31 | PXD035578 | Pride

Factors influencing in vivo deposition of histone variants H3.1 and H3.3

Project description:Establishment of a proper chromatin landscape is central to genome function. Here, we explain H3 variant distribution by specific targeting and dynamics of deposition involving the CAF-1 and HIRA histone chaperones. Impairing replicative H3.1 incorporation via CAF-1 enables an alternative H3.3 deposition at replication sites via HIRA. Conversely, the H3.3 incorporation throughout the cell cycle via HIRA cannot be replaced by H3.1. ChIP-seq analyses reveal correlation between HIRA-dependent H3.3 accumulation and RNA pol II at transcription sites and specific regulatory elements, further supported by their biochemical association. Remarkably, the HIRA complex shows unique DNA binding properties and depleting HIRA increases DNA sensitivity to nucleases. We propose that protective gap-filling of naked DNA by HIRA leads to a broad distribution of H3.3, and HIRA association with Pol II ensures local H3.3 enrichment at specific sites. Examination of genome-wide localization of two histone H3 variants.

2011-12-16 | E-GEOD-31794 | biostudies-arrayexpress

UBN1/2 of HIRA complex is responsible for recognition and deposition of H3.3 at cis-regulatory elements of genes in mouse ES cells [ChIP-seq]

Project description:In this study, we demonstrate that the UBN1 or UBN2 subunit is mainly responsible for specific recognition and direct binding of H3.3 by the HIRA complex, while the HIRA subunit can enhance the binding affinity of UBN1 toward H3.3, but Cabin1 subunit cannot. We also demonstrate that both Ala87 and Gly90 residues of H3.3 are required and sufficient for the specific recognition and binding by UBN1. ChIP-seq studies reveal that two independent HIRA complexes (UBN1-HIRA and UBN2-HIRA) can cooperatively deposit H3.3 to cis-regulatory regions, including active promoters and active enhancers in mouse embryonic stem (mES) cells. Importantly, disruption of histone chaperone activities of UBN1 and UBN2 by FID/AAA mutation results in the defect of H3.3 deposition at promoters of developmental genes involved in neural differentiation, and subsequently causes the failure of activation of these genes during neural differentiation of mES cells. Together, our results provide novel insights into the mechanism by which the HIRA complex specifically recognizes and deposits H3.3 at promoters and enhancers of developmental genes, which plays a critical role in neural differentiation of mES cells

2018-08-23 | GSE117034 | GEO

UBN1/2 of HIRA complex is responsible for recognition and deposition of H3.3 at cis-regulatory elements of genes in mouse ES cells [RNA-seq]

2018-08-23 | GSE117032 | GEO

The interactomes of Ubn1 and Ubn2 in mouse embryonic stem cells

Project description:Ubn1 and Ubn2 are essential subunits of the Histone Regulator A (HiRA) complex, the H3.3 histone variant chaperone for euchromatin. We pulled-down Ubn1 and Ubn2 with a C-terminal AVI-tag in mouse embryonic stem cells and identified, besides all known components of the complex, transcription factors that may play a role in the recruitment of HiRA to chromatin.

2021-07-14 | PXD025466 | Pride

H3.Y discriminates between HIRA and DAXX chaperone complexes and reveals unexpected insights into human DAXX-H3.3-H4 binding and deposition requirements

Project description:Histone chaperones prevent promiscuous histone interactions before chromatin assembly. They guarantee faithful deposition of canonical histones and functionally specialized histone variants into chromatin in a spatial- and temporally-restricted manner. Here, we identify the binding partners of the primate-specific and H3.3-related histone variant H3.Y using several quantitative mass spectrometry approaches, and biochemical and cell biological assays. We find the HIRA, but not the DAXX/ATRX, complex to specifically recognize H3.Y, explaining its presence in transcriptionally active euchromatic regions. Accordingly, H3.Y nucleosomes are enriched in the transcription-promoting FACT complex and depleted of repressive posttranslational histone modifications. H3.Y mutational gain-of-function analyses screens reveal an unexpected combinatorial amino acid sequence requirement for histone H3.3 interaction with DAXX but not HIRA, and for H3.3 recruitment to PML nuclear bodies. We demonstrate the importance and necessity of specific H3.3 core region and C-terminal amino acids in discriminating between distinct chaperone complexes. Further, ChIP-seq experiments reveal that in contrast to euchromatic HIRA-dependent deposition sites, human DAXX/ATRX-dependent regions of histone H3 variant incorporation are enriched in heterochromatic H3K9me3 and simple repeat sequences. These data demonstrate that H3.Y's unique amino acids allow a functional distinction between HIRA and DAXX binding and its consequent deposition into open chromatin.

2017-03-13 | GSE94034 | GEO

Factors influencing in vivo deposition of histone variants H3.1 and H3.3

2011-12-16 | GSE31794 | GEO

HIRA protects telomeres against R-loop-induced instability in ALT cancer cells [ATAC-seq]

Project description:Alterations to chromatin modifiers, such as the inactivating mutations in the ATRX-DAXX chromatin remodeling/histone H3.3 deposition complex, are implicated as drivers of the cancer-specific Alternative Lengthening of Telomeres (ALT) pathway. Prior studies revealed that HIRA adapts to compensate for ATRX-DAXX loss to sustain ALT cancer cell survival. However, the specific mechanisms underlying HIRA’s ability to rescue telomeres from the consequences of ATRX-DAXX loss remain unclear. Here, using ATAC-seq and CUT&RUN, we demonstrate that HIRA-mediated deposition of new H3.3 is essential to maintain chromatin accessibility and to prevent the detrimental accumulation of nucleosome-free single-stranded DNA (ssDNA) at telomeres in ATRX-deficient ALT cancer cells. We provide evidence that the timely deposition of new H3.3 by HIRA and interacting partners UBN1 and UBN2 is crucial to prevent unwarranted TERRA R-loop formation and transcription-replication conflicts (TRCs) at telomeres. Furthermore, we determined that the delivery of H3.3 to telomeric chromatin by HIRA may link the phosphorylation of an H3.3-specific amino acid, serine 31, by Chk1 with mechanisms that promote productive ALT. Therefore, these studies identify a role for HIRA-mediated histone H3.3 deposition in TERRA R-loop homeostasis that we propose is essential for ensuring the survival of ALT cancer cells where the ATRX-DAXX complex is activated.

2024-10-21 | GSE269268 | GEO

HIRA protects telomeres against R-loop-induced instability in ALT cancer cells [CUT&RUN]

2024-10-21 | GSE269261 | GEO

Histone chaperone ASF1 mediates H3.3-H4 deposition in Arabidopsis

Project description:Histone chaperones and chromatin remodelers control nucleosome dynamics, which are essential for transcription, replication, and DNA repair. The histone chaperone Anti-Silencing Factor 1 (ASF1) plays a central role in facilitating CAF-1-mediated replication-dependent H3.1 deposition and HIRA-mediated replication-independent H3.3 deposition in yeast and metazoans. Whether ASF1 function is evolutionarily conserved in plants is unknown. Here, we show that Arabidopsis ASF1 proteins display a preference for the HIRA complex. Simultaneous mutation of both Arabidopsis ASF1 genes caused a decrease in chromatin density and ectopic H3.1 occupancy at loci typically enriched with H3.3. Genetic, transcriptomic, and proteomic data indicate that ASF1 proteins strongly prefers the HIRA complex over CAF-1. asf1 mutants also displayed an increase in spurious Pol II transcriptional initiation and showed defects in the maintenance of gene body CG DNA methylation and in the distribution of histone modifications. Furthermore, ectopic targeting of ASF1 caused excessive histone deposition, less accessible chromatin, and gene silencing. These findings reveal the importance of ASF1-mediated histone deposition for proper epigenetic regulation of the genome.

2022-10-27 | GSE188493 | GEO

OmicsDI is part of the ELIXIR infrastructure

OmicsDI is an Elixir interoperability service. Learn more ›

Tweets

OmicsDI Databases

PRIDE
PeptideAtlas
MassIVE
JPOST Repository
Physiome Model Repository

EGA
EVA
ENA
LINCS
PAXDB
Cell Collective

MetaboLights
Metabolomics Workbench
MetabolomeExpress
GNPS
BioModels
FAIRDOMHub

ArrayExpress
dbGaP
ExpressionAtlas
GEO
NODE

Information

Databases
Help
API
Contact us
Code on GitHub
Terms of use
Submit Data