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ChIP-chip from H9 hESCs for RNA Polymerase II, TBP, TAF3, TAF5, TAF7, and TAF11

ABSTRACT: The general transcription factor TFIID is composed of the TATA-box-binding protein (TBP) and approximately 14 TBP-associated factors (TAFs). Here we find, unexpectedly, that undifferentiated human embryonic stem cells (hESCs) contain only six TAFs (TAFs 2, 3, 5, 6, 7 and 11), whereas following differentiation all TAFs are expressed. Directed and global chromatin immunoprecipitation analyses reveal an unprecedented promoter occupancy pattern: most active genes are bound by only TAFs 3 and 5 along with TBP, whereas the remaining active genes are bound by TBP and all six hESC TAFs. Consistent with these results, hESCs contain a previously undescribed complex containing TAFs 2, 6, 7, 11 and TBP. Altering the composition of hESC TAFs, either by depletion of TAFs that are present or ectopic expression of TAFs that are absent, results in misregulation of pluripotency gene expression and induction of differentiation. Thus, the selective expression and use of TAFs underlies the ability of hESCs to self-renew. ChIP-chip was used in this study to assess the global pattern of TAF recruitment at a gene promoters, to verify the existence of two classes of genes which differentially recruit and use TAF proteins for transcription initiation.

ORGANISM(S): Homo sapiens

PROVIDER: GSE39312 | GEO | 2012/11/19

SECONDARY ACCESSION(S): PRJNA170540

REPOSITORIES: GEO

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ChIP-chip from H9 hESCs for RNA Polymerase II, TBP, TAF3, TAF5, TAF7, and TAF11

Project description:The general transcription factor TFIID is composed of the TATA-box-binding protein (TBP) and approximately 14 TBP-associated factors (TAFs). Here we find, unexpectedly, that undifferentiated human embryonic stem cells (hESCs) contain only six TAFs (TAFs 2, 3, 5, 6, 7 and 11), whereas following differentiation all TAFs are expressed. Directed and global chromatin immunoprecipitation analyses reveal an unprecedented promoter occupancy pattern: most active genes are bound by only TAFs 3 and 5 along with TBP, whereas the remaining active genes are bound by TBP and all six hESC TAFs. Consistent with these results, hESCs contain a previously undescribed complex containing TAFs 2, 6, 7, 11 and TBP. Altering the composition of hESC TAFs, either by depletion of TAFs that are present or ectopic expression of TAFs that are absent, results in misregulation of pluripotency gene expression and induction of differentiation. Thus, the selective expression and use of TAFs underlies the ability of hESCs to self-renew. ChIP-chip was used in this study to assess the global pattern of TAF recruitment at a gene promoters, to verify the existence of two classes of genes which differentially recruit and use TAF proteins for transcription initiation. Comparison of recruitment of 4 TAFs (TAF3, TAF5, TAF7 and TAf11) with the recruitment of TBP and RNA Polymerase II in wild-type H9 embryonic stem cells from replicate experiments

2012-11-19 | E-GEOD-39312 | biostudies-arrayexpress

Identification of genomic binding sites of a network of core promoter factors in developing Drosophila brains

Project description:The transcriptional mechanisms that allow neural stem cells (NSC) to balance self-renewal with differentiation are not well understood. We identify here a unique subset of TATA -binding protein associated factors (TAFs) as NSC identity genes in Drosophila. We found that depletion of any one of nine TAFs or the TBP-related factor 2 (TRF2), resulted in fewer NSCs exhibiting delayed cell cycle progression without impacting NSC survival. In contrast, depletion of TBP led to a delay in NSC cell cycle progression without loss of self-renewal. An integrated RNA-seq and DamID analysis revealed that TAFs function with both TBP and TRF2, and that TAF-TBP and TAF-TRF2 shared targets genes encode different subsets of transcription factors and RNA-binding proteins with established or emerging roles in NSC identity and brain development. Taken together, our results demonstrate that core promoter factors are selectively required for NSC identity in vivo by promoting cell cycle progression, NSC cell polarity and by preventing premature differentiation. Because pathogenic variants in TAF1, TAF2, TAF6, TAF8 and TAF13 have all been linked to human neurological disorders, this work may stimulate and inform future animal models of TAF-linked neurological disorders.

2019-04-01 | GSE120432 | GEO

Identification of transcriptional targets of a network of Drosophila core promoter factors in neural stem cells

2019-04-01 | GSE120430 | GEO

Genome-wide regulation by TFIID and SAGA

Project description:TFIID and SAGA share a common set of TAFs, regulate chromatin, and deliver TBP to promoters. Here we examine their relationship within the context of the Saccharomyces cerevisiae genome-wide regulatory network. We find that while TFIID and SAGA make overlapping contributions to the expression of all genes, TFIID function predominates at ~90% and SAGA at ~10% of the measurable genome. Strikingly, SAGA-dominated genes are largely stress-induced and TAF-independent, and are down-regulated by the coordinate action of a variety of chromatin, TBP, and RNA polymerase II regulators. In contrast, the TFIID-dominated class is less regulated, but is highly dependent upon TAFs including those shared between TFIID and SAGA. These two distinct modes of transcription regulation might reflect the need to balance inducible stress responses with the steady output of housekeeping genes. Keywords = Taf1 Keywords = Spt3 Keywords = Gcn5

2004-02-26 | E-GEOD-885 | biostudies-arrayexpress

CBFB-DSP-ChIPseq and YAP-DSP-ChIPseq

Project description:We developed a new method to extract open-chromatins that contain trans-acting factors (TAFs)-DNA complex crosslinked with dithiobis(succinimidyl propionate) (DSP). Using this method we identified CBFB as a cell density-sensitive TAF, which translocates between the cytoplasm and the nucleus in cell density-dependent manner. Here, we demonstrate that the extracted TAF/DNA complex is also amenable to ChIP-seq analysis.

2023-12-05 | GSE234731 | GEO

Genome-wide regulation by TFIID and SAGA

2004-02-27 | GSE885 | GEO

Clariom D gene array of HBMEC cells

Project description:Glioblastoma multiforme (GBM) presents a formidable clinical challenge due to its complex microenvironment. Here, we introduce lipid droplet (LD)-loaded macrophages, or tumor-associated foam cells (TAFs), as a previously unidentified immune cell population in GBM. Through extensive analyses of patient tumors, together with in vitro and in vivo investigations, we reveal that TAFs exhibit distinct pro-tumorigenic characteristics related to hypoxia, mesenchymal transition, angiogenesis, and impaired phagocytosis. Moreover, TAF presence correlates with worse patient outcome. Our mechanistic investigations demonstrate that TAF formation is facilitated by lipid cargo from extracellular vesicles released by GBM cells. Importantly, we demonstrate that targeting key enzymes involved in LD formation, such as DGAT1 or ACSL, effectively disrupts TAF functionality. This study establishes TAFs as a prominent immune cell entity in GBM and provides valuable insights into their interplay within the microenvironment. Disrupting LD formation to target TAFs presents an interesting avenue for future therapeutic development in GBM.

2023-08-16 | GSE236478 | GEO

Clariom D Pico gene array of microdissected GBM areas or PBMCs.

2023-08-16 | GSE236494 | GEO

scRNA of GBM tumors

Project description:Glioblastoma (GBM) presents a formidable clinical challenge due to its complex microenvironment. Here, we introduce tumor-associated foam cells (TAFs), a previously unidentified immune cell entity of lipid droplet (LD)-loaded macrophages, in GBM. Through extensive analyses of patient tumors, together with in vitro and in vivo investigations, we reveal that TAFs exhibit distinct pro-tumorigenic characteristics related to hypoxia, mesenchymal transition, angiogenesis, and impaired phagocytosis. Moreover, TAF presence correlates with worse patient outcome. Our mechanistic investigations demonstrate that TAF formation is facilitated by lipid cargo transfer from extracellular vesicles released by GBM cells. Importantly, we demonstrate that targeting key enzymes involved in LD formation, such as DGAT1 or ACSL, effectively disrupts TAF functionality. This study establishes TAFs as a prominent immune cell entity in GBM and provides valuable insights into their interplay within the microenvironment. Disrupting LD formation to target TAFs presents an interesting avenue for future therapeutic development in GBM.

2023-08-16 | GSE237673 | GEO

Fibroblasts associated with tumors refractory to anti-VEGF treatment

Project description:PDGF-C mediates the angiogenic and tumorigenic properties of fibroblasts associated with tumors refractory to anti-VEGF treatment Tumor associated fibroblasts (TAF) from different tumors exhibit distinct angiogenic and tumorigenic properties. Unlike normal skin fibroblasts (NSF) or TAF (TAF-TIB6) from TIB6 tumors that are sensitive to anti-VEGF treatment, TAF (TAF-EL4) from resistant EL4 tumors can stimulate TIB6 tumor growth even when VEGF is inhibited. We show that platelet-derived growth factor (PDGF)-C is upregulated in TAFs from resistant tumors. PDGF-C neutralizing antibodies blocked the angiogenesis induced by such TAF in vivo and slowed the growth of EL4 and admixture (TAF-EL4 + TIB6) tumors and exhibited additive effects with anti-VEGF-A antibodies. Hence, our data reveal a novel mechanism for TAF mediated tumorigenesis and suggest that some tumors may overcome inhibition of VEGF-mediated angiogenesis through upregulation of PDGF-C

2009-01-05 | GSE13549 | GEO

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