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BAF155 methylation at R1064 creates unique chromatin association patterns

ABSTRACT: CARM1, a coactivator for various cancer-relevant transcription factors, is overexpressed in breast cancer. To elucidate the functions of CARM1 in tumorigenesis, we knocked out CARM1 from several breast cancer cell lines using Zinc-Finger Nuclease technology, which resulted in drastic phenotypic and biochemical changes. The CARM1 KO cell lines enabled identification of novel CARM1 substrates, notably the SWI/SNF core subunit BAF155. Methylation of BAF155 at R1064 was found to be an independent prognostic biomarker for cancer recurrence and to regulate breast cancer cell migration and metastasis. Further, CARM1-mediated BAF155 methylation affects gene expression by directing methylated BAF155 to unique chromatin regions (e.g., c-Myc pathway genes). Collectively our studies uncover a mechanism by which BAF155 acquires tumorigenic functions via arginine methylation.

ORGANISM(S): Homo sapiens

PROVIDER: GSE52964 | GEO | 2014/03/28

SECONDARY ACCESSION(S): PRJNA230559

REPOSITORIES: GEO

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BAF155 methylation at R1064 creates unique chromatin association patterns

Project description:CARM1, a coactivator for various cancer-relevant transcription factors, is overexpressed in breast cancer. To elucidate the functions of CARM1 in tumorigenesis, we knocked out CARM1 from several breast cancer cell lines using Zinc-Finger Nuclease technology, which resulted in drastic phenotypic and biochemical changes. The CARM1 KO cell lines enabled identification of novel CARM1 substrates, notably the SWI/SNF core subunit BAF155. Methylation of BAF155 at R1064 was found to be an independent prognostic biomarker for cancer recurrence and to regulate breast cancer cell migration and metastasis. Further, CARM1-mediated BAF155 methylation affects gene expression by directing methylated BAF155 to unique chromatin regions (e.g., c-Myc pathway genes). Collectively our studies uncover a mechanism by which BAF155 acquires tumorigenic functions via arginine methylation. Examination of methylation of BAF155 (R1064) in breast cancer cells

2014-03-28 | E-GEOD-52964 | biostudies-arrayexpress

PKM2 methylation by CARM1 activates aerobic glycolysis to promote tumorigenesis

Project description:Metabolic reprogramming is a hallmark of cancer. Herein we discover that the key glycolytic enzyme pyruvate kinase M2 isoform (PKM2), but not the related isoform PKM1, is methylated by co-activator-associated arginine methyltransferase 1 (CARM1). PKM2 methylation reversibly shifts the balance of metabolism from oxidative phosphorylation to aerobic glycolysis in breast cancer cells. Oxidative phosphorylation depends on mitochondrial calcium concentration, which becomes critical for cancer cell survival when PKM2 methylation is blocked. By interacting with and suppressing the expression of inositol-1,4,5-trisphosphate receptors (InsP3Rs), methylated PKM2 inhibits the influx of calcium from the endoplasmic reticulum to mitochondria. Inhibiting PKM2 methylation with a competitive peptide delivered by nanoparticles perturbs the metabolic energy balance in cancer cells, leading to a decrease in cell proliferation, migration and metastasis. Collectively, the CARM1-PKM2 axis serves as a metabolic reprogramming mechanism in tumorigenesis, and inhibiting PKM2 methylation generates metabolic vulnerability to InsP3R-dependent mitochondrial functions.

2021-07-30 | MTBLS533 | MetaboLights

CARM1-expressing ovarian cancer depends on the histone methyltransferase EZH2 activity [RNA-Seq]

Project description:CARM1 is an arginine methyltransferase that asymmetrically dimethylates protein substrates on arginine residues. CARM1 is often overexpressed in cancers and stimulates growth. However, clinically applicable therapeutic strategies based on CARM1 expression in cancer remains to be explored. Here we show that epithelial ovarian cancer is among the cancers with the highest CARM1 amplification rates that predicates a shorter survival. Our unbiased screen show that CARM1-expressing ovarian cancer cells are selectively sensitive to the inhibition of EZH2, another epigenetic regulator that silences its target genes. Inhibition of EZH2 activity using a clinically applicable small molecule inhibitor significantly suppressed the growth of CARM1-expressing ovarian tumors in two xenograft models. The observed selectivity correlates with upregulation of EZH2 target genes in a CARM1-dependent manner. CARM1 promotes EZH2 dependent gene silencing by methylating BAF155 to alter the antagonism between EZH2 and BAF155. Together, these results indicate that pharmacological inhibition of EZH2 is a novel therapeutic strategy for CARM1-expressing cancers.

2018-03-02 | GSE95644 | GEO

CARM1-expressing ovarian cancer depends on the histone methyltransferase EZH2 activity [ChIP-Seq]

2018-03-02 | GSE95643 | GEO

Comparison of gene expression in skeletal muscle between Baf155 WT and mutant

Project description:Baf155 is a core subunit of SWI/SNF complex, an ATP dependent chromatin remodeler. To explore the function of Baf155 in skeletal muscle, we deleted the Baf155 in skeletal muscle and compared the gene expression profiling between wild type control and Baf155 deleted mutant mice.

2023-07-25 | GSE163373 | GEO

ENCODE ChIP-chip for BAF155 on Human Hela S3 Cells

Project description:BAF155 ChIP-chip performed on Human Hela S3 Cells for Nimblegen ENCODE arrays which comprise 50mer oligonucleotides spaced every 38bps (overlapping by 12nts). Goal is to identify binding sites for BAF155. Keywords = Transcription Factor Binding, BAF155, ChIP-chip, Human, Genome Tiling Arrays Keywords: ChIP-chip

2005-11-04 | GSE3549 | GEO

A hypermethylation strategy utilized by enhancer-bound CARM1 to promote estrogen receptor a-dependent transcriptional activation and breast carcinogenesis (RNA-seq)

Project description:While protein arginine methyltransferases (PRMTs) and PRMT-catalyzed protein methylation have been well-known to be involved in a myriad of biological processes, their roles in carcinogenesis, particularly in estrogen receptor alpha (ERa)-positive breast cancers, remain incompletely understood. Here we focused on investigating PRMT4 (also called coactivator associated arginine methyltransferase 1, CARM1) due to its high expression and the associated poor prognosis in ERa-positive breast cancers. We first uncovered the chromatin-binding landscape and transcriptional targets of CARM1 in the presence of estrogen in ERa-positive breast cancer cells employing genomic and transcriptomics approaches. CARM1 was found to be predominantly and specifically recruited to ERa-bound active enhancers and essential for the transcriptional activation of cognate estrogen-induced gene transcriptional activation in response to estrogen. Global mapping of CARM1 substrates revealed that CARM1 methylates a large cohort of proteins with diverse biological functions, including regulation of intracellular estrogen receptor signaling, chromatin organization, chromatin remodeling and others. Intriguingly, a number of proteins were hypermethylated exclusively by CARM1 on a cluster of arginine residues. Exemplified by MED12, hypermethylation of these proteins by CARM1 served as a molecular beacon for recruiting coactivator protein, tudor domain-containing 3 (TDRD3), to ensure the full activation of estrogen/ERa target genes. In consistent with its critical role in estrogen-induced gene transcriptional activation, CARM1 was found to promote cell proliferation of ERa-positive breast cancer cells in vitro and tumor growth in mice. Taken together, our study uncovered a “hypermethylation” strategy utilized by CARM1 in gene transcriptional regulation, and suggested that CARM1 can server as a therapeutic target for breast cancer treatment.

2020-01-17 | GSE124447 | GEO

A hypermethylation strategy utilized by enhancer-bound CARM1 to promote estrogen receptor a-dependent transcriptional activation and breast carcinogenesis (ChIP-Seq)

2020-03-31 | GSE124448 | GEO

lncRNA-seq analysis CARM1 knockdown effect on MDA-MB-231 cells

Project description:Previous studies reported that NEAT1 and its partner p54nrb are necessary for CARM1 to associate with paraspeckles and H3R26 methylation. There are also reports that CARM1 is essential for LincGET's role in guiding the ICM lineage in mouse embryos. We speculate that there may be a connection between CARM1 and lncRNA. In order to verify our guess, we conducted lncRNA-seq experiments against CARM1 control or siRNA in MDA-MB-231 cells to explore the lncRNA that may be regulated downstream of CARM1. Here, we showed that CARM1 and HIF1A co-upregulates the expression of MALAT1 in hypoxia pathway to promote carcinogenesis and metastasis in triple-negative breast cancer cells. These results indicate that there is a connection among CARM1, HIF1A and MALAT1 in triple-negative breast cancer.

2024-03-03 | GSE168121 | GEO

CARM1 interacts and hypermethylates the NuRD chromatin remodeling complex to promote gene transcriptional activation and cell cycle progression

Project description:Protein arginine methyltransferase CARM1 has been shown to methylate a large number of non-histone proteins, and play important roles in gene transcriptional activation, cell cycle progress, and tumorigenesis. However, the critical substrates through which CARM1 exerts its functions remain to be fully characterized. Here, we reported that CARM1 directly interacts with the GATAD2A/2B subunit in the nucleosome remodeling and deacetylase (NuRD) complex, expanding the activities of NuRD to include protein arginine methylation. CARM1 and NuRD bind and activate a large cohort of genes with implications in cell cycle control to facilitate the G1 to S phase transition. This gene activation process requires CARM1 to hypermethylate GATAD2A/2B at a cluster of arginines, which is critical for the recruitment of the NuRD complex. The clinical significance of this gene activation mechanism is underscored by the high expression of CARM1 and NuRD in breast cancers, and the fact that knockdown CARM1 and NuRD inhibits breast cancer cell growth in vitro and tumorigenesis in vivo. These findings reveal a gene activation program that requires the dual specificity established by CARM1 on chromatin and a key chromatin remodeler.

2024-07-17 | GSE209909 | GEO

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