Prmt1 supports antibody affinity maturation and represses plasma cell differentiation
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA445965 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR6907700_1.fastq.gz | Fastqsanger.gz | |||
| SRR6907700_2.fastq.gz | Fastqsanger.gz | |||
| SRR6907701_1.fastq.gz | Fastqsanger.gz | |||
| SRR6907701_2.fastq.gz | Fastqsanger.gz | |||
| SRR6907702_1.fastq.gz | Fastqsanger.gz |
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Project description:Germinal center (GC) B cells undergo cycles of somatic hypermutation and selection, thus increasing their antibody affinity before differentiating into plasma or memory cells. The mechanisms dictating the dynamics of GC B cells are incompletely understood. We show that ablating the Protein arginine methyltransferase 1 (PRMT1) in GC B cells reduces antibody affinity maturation by impairing GC dynamics, as shown by compromised GC expansion, accumulation of CXCR4- B cells, and increased memory B cell differentiation, partly, at the expense of plasma cell production. Furthermore, PRMT1 distinguishes the subset of GC B cells that reenter the GC dark zone after positive selection, in which it is upregulated by Myc in conjunction with mTORC signaling. PRMT1 opposes mature B cell differentiation, as shown by higher plasma cell differentiation of PRMT1-deficient B cells activated ex vivo, a function co-opted by B cell lymphoma cells, in which PRMT1 expression also correlates with Myc expression and outcome.
2023-04-27 | GSE189276 | GEO
Project description:Recycling of memory B cell supports affinity maturation to antigenic drift
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Project description:PRMT1 is thought to be responsible for the majority of PRMT activity in Toxoplasma gondii, but its exact function is unknown. We generated T. gondii mutants lacking PRMT1 (∆prmt1) by deletion of the PRMT1 gene. ∆prmt1 parasites exhibit morphological defects during cell division and grow slowly, and this phenotype reverses in the complemented strain ∆prmt::PRMT1mRFP. PRMT1 localizes primarily in the cytoplasm with enrichment at the centrosome, and the strain lacking PRMT1 is unable to segregate progeny accurately. Unlike wild-type and complemented parasites, ∆prmt1 parasites have abnormal daughter buds, perturbed centrosome stoichiometry, and loss of synchronous replication. Whole genome expression profiling demonstrated differences in expression of cell cycle regulated genes in ∆prmt1 relative to the complemented ∆prmt1::PRMT1mRFP and parental wild-type strains, but these changes did not correlate with a specific block in cell cycle. Although PRMT1’s primary biological function was previously proposed to be methylation of histones, our genetic studies suggest that the most critical function of PRMT1 is within the centrosome as a regulator of daughter cell counting to assure the proper replication of the parasite. RNA samples were isolated in triplicates from RH-hxgprt parent strain (W), PRMT1 knockout (K) strain and PRMT1 knockout strain complemented with RFP-tagged PRMT1 protein (C). Parasites were grown for 32h at 37C. Samples were hybridized to the Toxoplasma gondii Affymetrix microarray (ToxoGeneChip: http://ancillary.toxodb.org/docs/Array-Tutorial.html). Hybridization data was preprocessed with Robust Multi-array Average (RMA) and normalized using per chip and per gene median polishing and analyzed using the software package GeneSpring GX (Agilent Technologies).
2015-09-18 | E-GEOD-73177 | biostudies-arrayexpress
Project description:Transcriptional deregulation plays a major role in acute myeloid leukemia, identification of epigenetic modifying enzymes essential for the maintenance of oncogenic transcription programs holds the key to better understanding the biology and designing effective therapeutic strategies for the disease. Here we provide experimental evidence showing the functional involvement and therapeutic potentials of targeting PRMT1 with H4R3 methyltransferase activity in various MLL and non-MLL leukemias. PRMT1 is necessary but not sufficient for leukemic transformation, which requires co-recruitment of KDM4C with H3K9 demethylase activity by chimeric transcription factors to mediate epigenetic reprogramming. Inhibition of KDM4C/PRMT1 suppresses transcription and transformation ability of MLL fusions and MOZ-TIF2, revealing a novel and targetable epigenetic circuitry mediated by PRMT1 and KDM4C in acute leukemia.
2016-01-14 | E-MTAB-3322 | biostudies-arrayexpress
Project description:Here we determine the genome-wide binding sites of PRMT1 in primary human keratinocytes. We also investigated the impact of casein kinase inhibitor D4476 on PRMT1 genomic binding.
2018-02-02 | GSE110050 | GEO
Project description:PRMT1 is known as a regulator of immune function by directly interacting with interferon receptors, methylating STAT1, and promoting B cell and macrophage differentiation by methylating CDK4 or B cell antigen receptor However, the function of PRMT1 as a therapeutic target of cancer remains largely elusive, particularly for its role in cancer immunosurveillance. Here, we performed bulk RNA-seq for CT26, a mouse tumor cell line, after either knocking down of endogeneous Prmt1 or blocking PRMT1 by two specific inhibitors, namely MS023 and GSK3368715.
2023-03-21 | GSE203466 | GEO
Project description:Affinity ligands such as antibodies are widely used in (bio)medical research for purifying proteins from complex biological samples. These ligands are generally immobilized onto solid supports which facilitate the separation of captured protein from sample matrix. Adsorptive microtiter plates are commonly used as solid supports prior to immunochemical detection (e.g. immunoassays) but hardly ever prior to LC-MS-based detection, and here we describe some applications, opportunities, and challenges of corresponding workflows.
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Project description:The interplay between multiple transcription factors precisely regulates eukaryotic transcription. Here, we report that the protein methyltransferases, MLL2 and PRMT1, interact directly and act collectively to regulate gene expression. PRMT1 binds to the N-terminal region of MLL2, considered an intrinsically disordered region, and methylates multiple arginine residues within its RGG/RG motifs. Notably, overexpression of PRMT1 decreased poly-ubiquitylation of MLL2, whereas mutations on methylation sites in MLL2 increased MLL2 poly-ubiquitylation, suggesting that PRMT1-mediated methylation stabilizes MLL2. MLL2 and PRMT1 cooperatively stimulated the expression of a chromosomal reporter gene in a PRMT1-mediated, MLL2-methylation–dependent manner. RNA-seq analysis found that MLL2 and PRMT1 jointly regulate the expression of genes involved in cell membrane and extracellular matrix functions, and depletion of either resulted in impaired cell migration and invasion. Our study provides evidence that PRMT1-mediated MLL2 methylation regulates MLL2 protein stability and the expression of their target genes.
2024-10-21 | GSE274754 | GEO
Project description:PRMT1 is thought to be responsible for the majority of PRMT activity in Toxoplasma gondii, but its exact function is unknown. We generated T. gondii mutants lacking PRMT1 (∆prmt1) by deletion of the PRMT1 gene. ∆prmt1 parasites exhibit morphological defects during cell division and grow slowly, and this phenotype reverses in the complemented strain ∆prmt::PRMT1mRFP. PRMT1 localizes primarily in the cytoplasm with enrichment at the centrosome, and the strain lacking PRMT1 is unable to segregate progeny accurately. Unlike wild-type and complemented parasites, ∆prmt1 parasites have abnormal daughter buds, perturbed centrosome stoichiometry, and loss of synchronous replication. Whole genome expression profiling demonstrated differences in expression of cell cycle regulated genes in ∆prmt1 relative to the complemented ∆prmt1::PRMT1mRFP and parental wild-type strains, but these changes did not correlate with a specific block in cell cycle. Although PRMT1’s primary biological function was previously proposed to be methylation of histones, our genetic studies suggest that the most critical function of PRMT1 is within the centrosome as a regulator of daughter cell counting to assure the proper replication of the parasite.
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Project description:Through an shRNA screen we have identified Prmt1 as a genetic vulnerability of p53/Rb-null murine osteosarcoma cells. Depletion of Prmt1 in p53-deficient cells impairs tumor initiation and maintenance in vitro and in vivo. Mechanistic studies reveal that translation-associated pathways are enriched for Prmt1 downstream targets, implicating a role of Prmt1 in translation control. In particular, we have shown that loss of Prmt1 leads to a the decrease in arginine methylation of the translation initiation complex, thereby disrupting its assembly and inhibiting translation. We also observed that p53/Rb-null cells are sensitive to p53-induced translation stress. Analysis of the human tumor cell Achilles data set further reveals that Prmt1 and translation-associated pathways converge on the same functional networks. We propose that targeted therapy directed to inhibition of Prmt1 and its associated translation-related pathways represents a novel and promising therapeutic strategy for p53-deficient cancer cells that exhibit dependencies on translation stress response.
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