Hierarchical interactions between chromatin remodeling transcription factors define the epigenetic landscape of antiviral T cells
Ontology highlight
ABSTRACT:
ORGANISM(S): Mus musculus
PROVIDER: GSE166718 | GEO | 2021/12/13
REPOSITORIES: GEO
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Project description:T cell activation induces rapid proliferative expansion and the acquisitions of specialized effector functions that enable protection against invading pathogens. While a multitude of transcription factors (TFs) have been implicated in the regulation of T cell activation, it remains largely unclear how their functions are organized and integrated at the genomic level. Here, we leveraged naturally occurring TF binding site polymorphisms in wild derived inbred mice to identify the most critical “heavy lifters” that shape the epigenetic landscape of naïve and activated antiviral CD4 and CD8 T cells. We found that representative members of Ets, Runx, and TCF/Lef families occupied the vast majority of accessible chromatin regions and that interactions between them were associated with distinct epigenetic responses to T cell activation. We define prevalent genomic functions of Ets1, Runx1, and TCF1 as “housekeeper”, “universal amplifier”, and “placeholder”, respectively. Interestingly, regulatory elements associated with some of the most strongly induced and well-characterized immune response genes showed a non-canonical pattern of TF recruitment.
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2009-12-18 | E-GEOD-17954 | biostudies-arrayexpress
Project description:To elucidate how genomic sequences build transcriptional control networks we need to understand the connection between DNA sequence and transcription factor binding and function. Binding predictions based solely on consensus predictions are limited because a single factor can use degenerate sequence motifs and related transcription factors often prefer identical sequences. The ETS family transcription factor, ETS1, exemplifies these challenges. Unexpected, redundant occupancy of ETS1 and other ETS proteins is observed at promoters of housekeeping genes in T cells due to common sequence preferences and the presence of strong consensus motifs. However, ETS1 exhibits a specific function in T cell activation, thus unique transcriptional targets are predicted. To uncover the sequence motifs that mediate specific functions of ETS1, chromatin immunoprecipitation coupled with high-throughput sequencing (ChIP-seq) identified both promoter and enhancer binding events in Jurkat T cells. A comparison with DNase I sensitivity both validated the dataset and improved accuracy. Redundant occupancy of ETS1 with the ETS protein GABPA occurred primarily in promoters of housekeeping genes, whereas ETS1 specific occupancy occurred in the enhancers of T-cell specific genes. Two routes to ETS1 specificity were identified: an intrinsic preference of ETS1 for a variant of the ETS family consensus sequence and the presence of a composite sequence that can support cooperative binding with a RUNX transcription factor. Genome-wide occupancy of RUNX factors corroborated the importance of this partnership. Furthermore, genome-wide occupancy of co-activator CBP indicated tight co-localization with ETS1 at specific enhancers, but not redundant promoters. The distinct sequences associated with redundant versus specific ETS1 occupancy were predictive of promoter or enhancer location and the ontology of nearby genes. These findings demonstrate that diversity of binding motifs may enable variable transcription factor function at different genomic sites.
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Project description:Notch activation is highly prevalent in several cancers, including more than 60% of cases of T-cell acute lymphoblastic leukemia (T-ALL). However, the use of pan-Notch inhibitors to treat cancers has been hampered by excessive toxicities, particularly affecting intestinal health. In order to combat Notch-driven oncogenic signals with less toxicity, one strategy is to target the transcriptional cofactors that promote tissue-specific Notch activation. We previously showed that Zmiz1 is a direct Notch1 cofactor that selectively promotes T-cell development and leukemogenic functions of Notch1. Ets1 is an excellent candidate as a transcription factor (TF) that promotes Notch functions selectively in T-ALL since the scope of Ets1 expression is far more limited than Notch expression and since Ets1 co-occupies Notch-bound enhancers with high frequency. Here, we used comparative ChIP-Seq and gene expression methods to show that Ets1 withdrawal impaired Notch complex recruitment and H3K27 acetylation at co-bound enhancers and disabled shared oncogenic pathways. ChIP-Seq showed that Ets1 peaks overlapped with 73-76% of Zmiz1 peaks and 71-75% of Notch1 peaks. Ets1 knockdown reduced Notch1, Rbpj, and Zmiz1 occupancy at enhancers that regulate genes that drive T-cell differentiation and/or T-ALL proliferation. RNA-Seq showed that Ets1 coregulated ~22% of Notch target genes with induction of Myc as a dominant and functional contribution. Our data support an emerging model in which transcription factors like Ets1 assist Notch in activating a subset of enhancers with important functions for T-cell leukemogenesis and development. Strategies that exploit the context dependence of Notch might combat the Notch pathway in cancer cells with less toxicity than pan-Notch inhibitors.
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Project description:The function and retention/reprogramming of epigenetic marks during the germline-to-embryo transition is a key issue in developmental and cellular biology, with relevance to stem cell programming and trans-generational inheritance. In zebrafish, DNAme patterns are programmed in transcriptionally-quiescent early cleavage embryos; paternally-inherited patterns are maintained, whereas maternal patterns are reprogrammed to match the paternal pattern. Here we show that a ‘placeholder’ nucleosome, containing the histone H2A variant H2A.Z(FV) and H3K4me1, occupies virtually all regions lacking DNAme in both sperm and cleavage embryos – residing at promoters encoding housekeeping and early embryonic transcription factors. Upon genome-wide transcriptional onset, genes with the Placeholder become either active H3K4me3-marked or silent H3K4me3/K27me3-marked (bivalent). Importantly, functional perturbation causing Placeholder loss confers DNAme acquisition, whereas acquisition/expansion of Placeholder confers DNA hypomethylation and improper gene activation. Thus, during transcriptionally quiescent stages (gamete-zygote-cleavage), an H2A.Z(FV)/H3K4me1-containing Placeholder nucleosome deters DNAme, poising parental genes for either gene-specific activation or facultative repression.
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Project description:The function and retention/reprogramming of epigenetic marks during the germline-to-embryo transition is a key issue in developmental and cellular biology, with relevance to stem cell programming and trans-generational inheritance. In zebrafish, DNAme patterns are programmed in transcriptionally-quiescent early cleavage embryos; paternally-inherited patterns are maintained, whereas maternal patterns are reprogrammed to match the paternal pattern. Here we show that a ‘placeholder’ nucleosome, containing the histone H2A variant H2A.Z(FV) and H3K4me1, occupies virtually all regions lacking DNAme in both sperm and cleavage embryos – residing at promoters encoding housekeeping and early embryonic transcription factors. Upon genome-wide transcriptional onset, genes with the Placeholder become either active H3K4me3-marked or silent H3K4me3/K27me3-marked (bivalent). Importantly, functional perturbation causing Placeholder loss confers DNAme acquisition, whereas acquisition/expansion of Placeholder confers DNA hypomethylation and improper gene activation. Thus, during transcriptionally quiescent stages (gamete-zygote-cleavage), an H2A.Z(FV)/H3K4me1-containing Placeholder nucleosome deters DNAme, poising parental genes for either gene-specific activation or facultative repression.
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