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Coordinated regulation of cellular identity–associated H3K4me3 breadth by the COMPASS family.

ABSTRACT: Set1A and Set1B, two members of the COMPASS family of methyltransferases that methylate the histone H3 lysine 4 (H3K4) residue, have been accredited as primary depositors of global H3K4 trimethylation (H3K4me3) in mammalian cells. Our previous studies in mouse embryonic stem cells (ESCs) demonstrated that deleting the enzymatic SET domain of Set1A does not perturb bulk H3K4me3, indicating possible compensatory roles played by other COMPASS methyltransferases. Here, we generated a series of ESC lines harboring compounding mutations of COMPASS methyltransferases. We find that Set1B is functionally redundant to Set1A in implementing H3K4me3 at highly expressed genes, while Mll2 deposits H3K4me3 at less transcriptionally active promoters. While Set1A-B/COMPASS is responsible for broad H3K4me3 peaks, Mll2/COMPASS establishes H3K4me3 with narrow breadth. Additionally, Mll2 helps preserve global H3K4me3 levels and peak breadth in the absence of Set1A-B activity. Our results illustrate the biological flexibility of such enzymes in regulating transcription in a context-dependent manner to maintain stem cell identity.

SUBMITTER: Sze CC

PROVIDER: S-EPMC7314515 | biostudies-literature | 2020 Jun

REPOSITORIES: biostudies-literature

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Coordinated regulation of cellular identity-associated H3K4me3 breadth by the COMPASS family

Project description:Histone H3 lysine 4 trimethylation (H3K4me3) facilitates recruitment of transcription factors and epigenetic effectors to promote transcriptional activation and ensure cellular identity. This conserved histone mark is implemented by the COMPASS (COMplex of Proteins ASsociated with Set1) family of H3K4 methyltransferases. COMPASS members Set1A and Set1B have been accredited as primary depositors of global H3K4me3 in mammalian cells. Our previous studies in mouse embryonic stem cells (ESCs) demonstrated that deleting the enzymatic SET domain of Set1A does not perturb bulk H3K4me3, indicating possible compensatory roles played by other COMPASS methyltransferases. Here, we generated a series of ESC lines harboring compounding mutations of the COMPASS enzymes. We find that Set1B is functionally redundant to Set1A in implementing H3K4me3 at highly expressed genes, while Mll2 deposits H3K4me3 at less transcriptionally active promoters. Furthermore, Set1A and Set1B are responsible for broad H3K4me3 peaks, whereas Mll2 establishes H3K4me3 with narrow breadth. Most importantly, Mll2 helps preserve global H3K4me3 levels and peak breadth. Our results illustrate the biological flexibility of such enzymes in regulating transcription in a context-dependent manner to maintain stem cell identity, which could assist our understanding of their disease liability.

2020-06-27 | GSE152595 | GEO

Coordinated regulation of cellular identity-associated H3K4me3 breadth by the COMPASS family

Project description:Coordinated regulation of cellular identity-associated H3K4me3 breadth by the COMPASS family

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H3K4me3 breadth is linked to cell identity and transcriptional consistency.

Project description:Trimethylation of histone H3 at lysine 4 (H3K4me3) is a chromatin modification known to mark the transcription start sites of active genes. Here, we show that H3K4me3 domains that spread more broadly over genes in a given cell type preferentially mark genes that are essential for the identity and function of that cell type. Using the broadest H3K4me3 domains as a discovery tool in neural progenitor cells, we identify novel regulators of these cells. Machine learning models reveal that the broadest H3K4me3 domains represent a distinct entity, characterized by increased marks of elongation. The broadest H3K4me3 domains also have more paused polymerase at their promoters, suggesting a unique transcriptional output. Indeed, genes marked by the broadest H3K4me3 domains exhibit enhanced transcriptional consistency and [corrected] increased transcriptional levels, and perturbation of H3K4me3 breadth leads to changes in transcriptional consistency. Thus, H3K4me3 breadth contains information that could ensure transcriptional precision at key cell identity/function genes.

| S-EPMC4137894 | biostudies-literature

Regulation of Cellular Identity in Cancer.

Project description:Neoplastic transformation requires changes in cellular identity. Emerging evidence increasingly points to cellular reprogramming, a process during which fully differentiated and functional cells lose aspects of their identity while gaining progenitor characteristics, as a critical early step during cancer initiation. This cell identity crisis persists even at the malignant stage in certain cancers, suggesting that reactivation of progenitor functions supports tumorigenicity. Here, we review recent findings that establish the essential role of cellular reprogramming during neoplastic transformation and the major players involved in it with a special emphasis on pancreatic cancer.

| S-EPMC4692359 | biostudies-literature

MLL3/MLL4/COMPASS Family on Epigenetic Regulation of Enhancer Function and Cancer.

Project description:During development, precise spatiotemporal patterns of gene expression are coordinately controlled by cis-regulatory modules known as enhancers. Their crucial role in development helped spur numerous studies aiming to elucidate the functional properties of enhancers within their physiological and disease contexts. In recent years, the role of enhancer malfunction in tissue-specific tumorigenesis is increasingly investigated. Here, we direct our focus to two primary players in enhancer regulation and their role in cancer pathogenesis: MLL3 and MLL4, members of the COMPASS family of histone H3 lysine 4 (H3K4) methyltransferases, and their complex-specific subunit UTX, a histone H3 lysine 27 (H3K27) demethylase. We review the most recent evidence on the underlying roles of MLL3/MLL4 and UTX in cancer and highlight key outstanding questions to help drive future research and contribute to our fundamental understanding of cancer and facilitate identification of therapeutic opportunities.

| S-EPMC5088509 | biostudies-other

H3K4me3 recognition by the COMPASS complex facilitates the restoration of this histone mark following DNA replication.

Project description:During DNA replication, parental H3-H4 marked by H3K4me3 are transferred almost equally onto leading and lagging strands of DNA replication forks. Mutations in replicative helicase subunit, Mcm2 (Mcm2-3A), and leading strand DNA polymerase subunit, Dpb3 (dpb3∆), result in asymmetric distributions of H3K4me3 at replicating DNA strands immediately following DNA replication. Here, we show that mcm2-3A and dpb3∆ mutant cells markedly reduce the asymmetric distribution of H3K4me3 during cell cycle progression before mitosis. Furthermore, the restoration of a more symmetric distribution of H3K4me3 at replicating DNA strands in these mutant cells is driven by methylating nucleosomes without H3K4me3 by the H3K4 methyltransferase complex, COMPASS. Last, both gene transcription machinery and the binding of parental H3K4me3 by Spp1 subunit of the COMPASS complex help recruit the enzyme to chromatin for the restoration of the H3K4me3-marked state following DNA replication, shedding light on inheritance of this mark following DNA replication.

| S-EPMC9075808 | biostudies-literature

Cellular and Molecular Identity of Tumor-Associated Macrophages in Glioblastoma.

Project description:In glioblastoma (GBM), tumor-associated macrophages (TAM) represent up to one half of the cells of the tumor mass, including both infiltrating macrophages and resident brain microglia. In an effort to delineate the temporal and spatial dynamics of TAM composition during gliomagenesis, we used genetically engineered and GL261-induced mouse models in combination with CX3CR1GFP/WT;CCR2RFP/WT double knock-in mice. Using this approach, we demonstrated that CX3CR1LoCCR2Hi monocytes were recruited to the GBM, where they transitioned to CX3CR1HiCCR2Lo macrophages and CX3CR1HiCCR2- microglia-like cells. Infiltrating macrophages/monocytes constituted approximately 85% of the total TAM population, with resident microglia accounting for the approximately 15% remaining. Bone marrow-derived infiltrating macrophages/monocytes were recruited to the tumor early during GBM initiation, where they localized preferentially to perivascular areas. In contrast, resident microglia were localized mainly to peritumoral regions. RNA-sequencing analyses revealed differential gene expression patterns unique to infiltrating and resident cells, suggesting unique functions for each TAM population. Notably, limiting monocyte infiltration via genetic Ccl2 reduction prolonged the survival of tumor-bearing mice. Our findings illuminate the unique composition and functions of infiltrating and resident myeloid cells in GBM, establishing a rationale to target infiltrating cells in this neoplasm. Cancer Res; 77(9); 2266-78. ©2017 AACR.

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COMPASS Family Histone Methyltransferase ASH2L Mediates Corticogenesis via Transcriptional Regulation of Wnt Signaling

Project description:This SuperSeries is composed of the SubSeries listed below Histone methylation is essential for regulating gene expression during organogenesis to maintain stem cells and execute a proper differentiation program for their descendants. Here, we show that the COMPASS family histone methyltransferase co-factor ASH2L is required for maintaining neural progenitor cells (NPCs) and the production and positioning of projection neurons during neocortex development. Specifically, loss of ASH2L in NPCs results in malformation of the neocortex; the mutant neocortex shows fewer neurons that are also abnormal in composition and laminar position. Moreover, ASH2L loss impairs the trimethylation of H3K4 and the transcriptional machinery specific for Wnt-β-catenin signaling, inhibiting the proliferation ability of NPCs at late stages of neurogenesis by disrupting S phase entry to inhibit cell cycle progression. Overexpressing β-catenin after ASH2L elimination rescues the proliferation deficiency. Therefore, our findings demonstrate ASH2L is crucial for modulating Wnt signaling to maintain NPCs and generate a full complement of neurons during mammalian neocortex development.

2019-07-16 | GSE120988 | GEO

Genome-wide network model capturing seed germination reveals coordinated regulation of plant cellular phase transitions.

Project description:Seed germination is a complex trait of key ecological and agronomic significance. Few genetic factors regulating germination have been identified, and the means by which their concerted action controls this developmental process remains largely unknown. Using publicly available gene expression data from Arabidopsis thaliana, we generated a condition-dependent network model of global transcriptional interactions (SeedNet) that shows evidence of evolutionary conservation in flowering plants. The topology of the SeedNet graph reflects the biological process, including two state-dependent sets of interactions associated with dormancy or germination. SeedNet highlights interactions between known regulators of this process and predicts the germination-associated function of uncharacterized hub nodes connected to them with 50% accuracy. An intermediate transition region between the dormancy and germination subdomains is enriched with genes involved in cellular phase transitions. The phase transition regulators SERRATE and EARLY FLOWERING IN SHORT DAYS from this region affect seed germination, indicating that conserved mechanisms control transitions in cell identity in plants. The SeedNet dormancy region is strongly associated with vegetative abiotic stress response genes. These data suggest that seed dormancy, an adaptive trait that arose evolutionarily late, evolved by coopting existing genetic pathways regulating cellular phase transition and abiotic stress. SeedNet is available as a community resource (http://vseed.nottingham.ac.uk) to aid dissection of this complex trait and gene function in diverse processes.

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COMPASS Family Histone Methyltransferase ASH2L Mediates Corticogenesis via Transcriptional Regulation of Wnt Signaling [RNA-seq]

Project description:We show that the COMPASS family histone methyltransferase co-factor ASH2L is required in NPCs proliferation and upper layer cortical projection neurons production and position. Deletion of ASH2L impairs trimethylation of H3K4 and transcriptional machinery specifically for subsets of Wnt-β-catenin signaling, disrupting their transcription and consequently inhibiting the proliferation ability of NPCs in late stages of neurogenesis.

2019-07-16 | GSE120986 | GEO

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