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Genome-wide mapping of MAT2A-associsted regions in bovine blastocysts

ABSTRACT: Methionine adenosyltransferase (MAT), that catalyzes the synthesis of S-adenosylmethionine (SAM) from ATP and methionine, is involved in folate-mediated one-carbon metabolism (OCM) that is essential for preimplantation embryos in terms of both short-term periconceptional development and long-term phenotypic programming beyond the periconceptional period. SAM is the universal methyl donor for epigenetic methylation of DNA and histones. In the context of the long-term phenotypic programming by the modulation of OCM during periconceptional period, possible interactions between MAT2A and epigenetic status of specific genes during this period are of particular interest. MAT2A has been proposed to interact with many chromatin-related proteins and be recruited to their specific target genes to constitute gene-regulatory complexes. Thus, in the aim of addressing the possible interaction of MAT2A with specific genomic DNA regions in periconceptional period, we performed a ChIP-seq analysis using MAT2A antibody against bovine blastocysts.

ORGANISM(S): Bos taurus

PROVIDER: GSE85836 | GEO | 2017/06/19

SECONDARY ACCESSION(S): PRJNA339522

REPOSITORIES: GEO

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MAT2A and methionine dependency are indispensible for H3K27M mutant gliomas.

Project description:Gliomas bearing driver mutations of histone 3 lysine 27 (H3K27M) are incurable brain tumors. H3K27M mutant tumors display unique epigenomes with global loss of the chromatin repressive H3K27 trimethylation mark. Here, we generated a syngeneic H3K27M mouse model to study the dependence upon amino acid (AA) metabolism by performing an AA drop out screen. H3K27M mutant cells, but not histone wildtype cells, were highly dependent on the amino acid, methionine. Interrogating the methionine cycle dependency through an siRNA screen identified the enzyme Methionine Adenosyltransferase 2A (MAT2A), which catalyzes production of S-adenosylmethionine (SAM), a methyl donor. Sensitivity to MAT2A loss in H3K27M mutant cells was not mediated through the canonical mechanism of MTAP deletion; instead, H3K27M mutant cells have lower MAT2A protein levels, which is mediated by Adenosylmethionine Decarboxylase 1 (AMD1) production of decarboxylated SAM (dcSAM). MAT2A loss induces global depletion of H3K36me3, a potent chromatin mark of transcriptional elongation, as evaluated by quantitative chromatin immunoprecipitation with reference exogenous genome sequencing (ChIP-Rx-Seq) in multiple DIPG lines. Tandem H3K36me3 ChIP-Rx-seq and RNA-seq identified several oncogenic and developmental transcriptional programs associated with MAT2A loss. Moreover, inducible knockdown of MAT2A or methionine-restricted diets (MR) extended survival in both syngeneic and patient-derived xenograft models (PDXs) in vivo. Collectively, our results provide novel connections between AA metabolism and the epigenome in H3K27M gliomas, suggesting that MAT2A, a central regulator of methionine metabolism, presents exploitable therapeutic vulnerabilities in H3K27M gliomas.

2022-01-28 | GSE160006 | GEO

8-Cl-Ado and 8-NH2-Ado Synergize with Venetoclax to Target the Methionine-MAT2A-SAM Axis in Acute Myeloid Leukemia

Project description:Background: Targeting the metabolic dependencies of acute myeloid leukemia (AML) cells is a promising therapeutical strategy. In particular, the cysteine and methionine metabolism pathway (C/M) is significantly altered in AML cells compared to healthy blood cells. Moreover, methionine has been identified as one of the dominant amino acid dependencies of AML cells. Methods: Through RNA-seq, we found that the two nucleoside analogs 8-chloro-adenosine (8CA) and 8-amino-adenosine (8AA) significantly suppress the C/M pathway in AML cells, and methionine-adenosyltransferase-2A (MAT2A) is one of most significantly downregulated genes. Additionally, mass spectrometry analysis revealed that Venetoclax (VEN), a BCL-2 inhibitor recently approved by the FDA for AML treatment, significantly decreases the intracellular level of methionine in AML cells. Based on these findings, we hypothesized that combining 8CA or 8AA with VEN can efficiently target the Methionine-MAT2A-S-adenosyl-methionine (SAM) axis in AML. Results: Our results demonstrate that VEN and 8CA/8AA synergistically decrease the SAM biosynthesis and effectively target AML cells both in vivo and in vitro. Conclusions: These findings suggest the promising potential of combining 8CA/8AA and VEN for AML treatment by inhibiting Methionine-MAT2A-SAM axis and provide a strong rationale for our recently activated clinical trial.

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TGF-β1/p65/MAT2A: a novel pathway involved in the regulation of intracellular SAM and liver fibrogenesis - Part1

Project description:Hepatic stellate cell (HSC) activation induced by transforming growth factor β (TGF-β1) plays a pivotal role in the fibrogenesis. The complex downstream mediators of TGF-β1 are largely unknown. Here, proteomics analysis and biological validation demonstrated that methionine adenosyltransferase 2A (MAT2A) was significantly upregulated in a CCl4-induced fibrosis mice model and a small molecule NPLC0393, known to block TGF-β1/Smad3 signaling, inhibited its upregulation. In HSC cells, TGF-β1 induced elevation of MAT2A and MAT2β expression as well as reduction of S-adenosylmethionine (SAM) content, which further promoted HSC activation. Functionally, in vivo and in vitro knockdown of MAT2A alleviated CCl4- and TGF-β1-induced HSC activation, whereas in vivo overexpression of MAT2A facilitated hepatic fibrosis and abolished therapeutic effect of NPLC0393. TGF-β1 induced p65 phosphorylation and NF-κB activation, thereby promoted the transcription of MAT2A and its protein expression. In addition, overexpression of p65 abrogated NPLC0393 mediated inhibition of HSC activation. This study identified a novel pathway TGF-β1/p65/MAT2A that was involved in the regulation of intracellular SAM contents and liver fibrogenesis, suggesting that this pathway is a potential therapeutic target for hepatic fibrosis.

2019-11-12 | PXD011134 | Pride

TGF-β1/p65/MAT2A: a novel pathway involved in the regulation of intracellular SAM and liver fibrogenesis - Part2

2019-11-12 | PXD011135 | Pride

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Project description:Epigenetic dysregulation plays a pivotal role in MLL pathogenesis, therefore serving as suitable therapeutic point of attack. SAM is the universal methyl donor in human cells and is synthesized by MAT2A. MAT2A is already known to be deregulated in different cancer types. Here, we used our human CRISPR/Cas9-MLLr leukemia model, faithfully mimicking MLL patients’ pathology with indefinite growth potential in in vitro culture, to evaluate the unknown role of MAT2A as therapeutic target. Comparable to publicly available patient data, we detected MAT2A to be significantly overexpressed in our CRISPR/Cas9-MLLr model compared to healthy controls. By using non-MLLr and MLLr cell lines and our model, we detected an MLLr specific enhanced response to PF-9366, a new MAT2A inhibitor, by alteration of proliferation, viability, differentiation, apoptosis and cell cycling. Moreover, the combinational treatment of PF-9366 with chemotherapy or targeted therapies against the SAM-dependent methyltransferases DOT1L and PRMT5, revealed even more pronounced effects. In summary, we uncovered MAT2A as a key regulator in MLL leukemogenesis and its inhibition led to significant anti-leukemic effects. Therefore, our study paves the avenue for clinical application of PF-9366 to improve the treatment of poor prognosis MLLr leukemia.

2020-06-22 | GSE141839 | GEO

NUDT21 regulates intron detention of the SAM synthetase MAT2A RNA

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2021-05-04 | GSE158591 | GEO

Transcriptomic profile in in vitro produced bovine morulae treated with MAT2A inhibitor

Project description:We obtained transcriptomic profiles in bovine morulae which had been in vitro treated with a methionine adenosyltransferase 2A (MAT2A) inhibitor from the 8-16 cell stage.

2022-05-31 | GSE198294 | GEO

Transcriptome analysis of methionine restriction or CRISPR knockout of AHCY or MAT2A in Rael cells

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The U6 snRNA m6A methyltransferase METTL16 regulates SAM synthetase intron retention

Project description:Maintenance of the intracellular levels of the methyl donor S-adenosylmethionine (SAM) is essential for a wide variety of biological processes. We demonstrate that the N6-adenosine methyltransferase METTL16 regulates expression of MAT2A, which encodes the only SAM synthetase expressed in most cells. Upon SAM depletion by methionine starvation, cells induce MAT2A expression by enhanced splicing of a retained intron. Induction requires METTL16 and its methylation substrate, a vertebrate conserved hairpin (hp1) in the MAT2A 3´ UTR. Increasing METTL16 occupancy on the MAT2A 3´ UTR is sufficient to induce efficient splicing. We propose that under SAM-limiting conditions, METTL16 occupancy on hp1 increases due to inefficient enzymatic turnover, which in turn promotes MAT2A splicing. Interestingly, human and S. pombe METTL16 methylate the U6 spliceosomal snRNA at a sequence identical to hp1. These observations suggest that the conserved U6 snRNA methyltransferase evolved an additional function in vertebrates to regulate SAM homeostasis.

2017-05-18 | GSE90914 | GEO

Genome-wide H3K27me3 profile in in vitro produced bovine morula treated with MAT2A inhibitor

Project description:We obtained genome-wide profiles of histone H3 lysine 27 trimethylation (H3K27me3) in bovine morula which had been in vitro treated with a methionine adenosyltransferase 2A (MAT2A) inhibitor from the 8-16 cell stage. Sequencing center: NODAI Genome Research Center, Tokyo University of Agriculture

2022-05-31 | GSE198293 | GEO

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