{"gene":"PRMT2","run_date":"2026-06-10T06:43:35","timeline":{"discoveries":[{"year":1998,"finding":"PRMT2 (HRMT1L1) contains an N-terminal SH2 domain in addition to a methyltransferase core domain. The paralog HRMT1L2 (PRMT1) exhibited in vitro methyltransferase activity and complemented a yeast HMT1 mutant in vivo, establishing functional conservation; PRMT2 itself was identified as a putative arginine methyltransferase based on sequence homology.","method":"Sequence analysis, yeast complementation assay, in vitro methyltransferase assay (for HRMT1L2)","journal":"Genomics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — yeast complementation and in vitro assay for the paralog; PRMT2 itself identified by homology with structural domain annotation, single study","pmids":["9545638"],"is_preprint":false},{"year":2001,"finding":"PRMT2 (HRMT1L1) interacts with the hnRNP E1B-AP5 via its SH3 domain (not SH2), co-localizes with E1B-AP5 in the nuclear fraction, and was identified as a candidate methyltransferase responsible for in vivo RGG-box methylation of E1B-AP5.","method":"Yeast two-hybrid screening, in situ immunofluorescence co-localization, domain-deletion analysis","journal":"The Biochemical journal","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — yeast two-hybrid plus immunofluorescence co-localization; direct enzymatic proof of E1B-AP5 methylation by PRMT2 not fully demonstrated in vitro in the abstract","pmids":["11513728"],"is_preprint":false},{"year":2006,"finding":"PRMT2 directly binds RB through its AdoMet-binding domain (unlike PRMT1, PRMT3, PRMT4), forms a ternary complex with E2F1 in the presence of RB, represses E2F1 transcriptional activity in an RB-dependent manner, and PRMT2 knockout MEFs show increased E2F activity and accelerated S-phase entry.","method":"Co-immunoprecipitation, reporter assays, gene targeting (knockout MEFs), cell-cycle analysis, vascular injury model","journal":"Experimental cell research","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal binding assays, reporter assays, genetic KO with defined cell-cycle phenotype, replicated with in vivo injury model, multiple orthogonal methods in one study","pmids":["16616919"],"is_preprint":false},{"year":2007,"finding":"PRMT2 acts as a coactivator of the androgen receptor (AR), interacting with the AR C-terminal region (identified by yeast two-hybrid). PRMT2 coactivation is blocked by a methyltransferase competitive inhibitor, indicating catalytic activity is required. Under androgen-free conditions PRMT2 is cytoplasmic; androgen treatment triggers co-nuclear translocation of AR and PRMT2, whereas AR antagonist hydroxyflutamide causes AR but not PRMT2 nuclear translocation.","method":"Yeast two-hybrid, luciferase reporter assays, immunofluorescence, methyltransferase inhibitor treatment","journal":"The Journal of steroid biochemistry and molecular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reporter assay with inhibitor evidence for catalytic requirement plus direct localization imaging; single lab, multiple methods","pmids":["17587566"],"is_preprint":false},{"year":2011,"finding":"Three novel C-terminal splice variants of PRMT2 (PRMT2α, PRMT2β, PRMT2γ) have distinct subcellular localizations determined by their alternatively spliced C-termini. All variants bind ERα in vitro and in vivo via their N-terminal regions and enhance ERα-mediated transactivation. PRMT2 silencing enhances 17β-estradiol-induced proliferation by regulating E2F1 and E2F1-responsive genes.","method":"Confocal microscopy, GST pulldown, co-immunoprecipitation, luciferase reporter assays, siRNA knockdown","journal":"The FEBS journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — binding shown by pulldown and Co-IP, localization by confocal imaging, functional consequence by reporter assay and KD; single lab with multiple methods","pmids":["22093364"],"is_preprint":false},{"year":2011,"finding":"PRMT2 regulates LPS-induced lung inflammatory responses; Prmt2 gene dosage controls airway hyperresponsiveness, neutrophil recruitment, and IL-6/TNF-α expression. Loss of PRMT2 impairs nuclear accumulation of NF-κB in stimulated macrophages.","method":"Mouse knockout/monosomy model, cytokine measurement, NF-κB nuclear fractionation","journal":"Journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic loss-of-function in vivo with defined molecular readout (NF-κB nuclear accumulation); single lab","pmids":["21957146"],"is_preprint":false},{"year":2015,"finding":"PRMT2 is required for LXR-mediated ABCA1 expression and ABCA1-dependent cholesterol efflux in macrophages; Prmt2-/- bone marrow-derived macrophages show reduced ABCA1 expression and cholesterol efflux. PRMT2 expression is reduced under high-glucose conditions.","method":"Prmt2 knockout mouse BMDMs, cholesterol efflux assay, gene expression analysis","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO with direct functional efflux assay; single lab, multiple readouts","pmids":["26288135"],"is_preprint":false},{"year":2017,"finding":"PRMT2 interacts with the splicing factor SAM68 via its SH3 domain, regulates SAM68 subcellular localization, and promotes an increase in the BCL-XL/BCL-XS ratio in TNF-α or LPS stimulated cells, demonstrating a role in alternative splicing of BCL-X.","method":"Proteomics (SH3 domain pulldown/MS), co-immunoprecipitation in cells, RT-PCR BCL-X isoform analysis","journal":"Journal of biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — proteomic identification of SH3 interactors confirmed by Co-IP, functional splicing readout; single lab","pmids":["28057797"],"is_preprint":false},{"year":2018,"finding":"PRMT2 is responsible for histone H3R8 asymmetric dimethylation (H3R8me2a). In glioblastoma, H3R8me2a enrichment at gene promoters/enhancers correlates with active histone marks and is required for oncogenic gene expression programs including cell cycle genes. Silencing or catalytic inactivation of PRMT2 inhibits GBM cell growth and glioblastoma stem cell self-renewal.","method":"ChIP-seq, siRNA/shRNA knockdown, catalytic mutant expression, in vitro and in vivo tumor models","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP-seq mapping of H3R8me2a, catalytic mutant validation, loss-of-function phenotype in vitro and in vivo; multiple orthogonal methods","pmids":["30382083"],"is_preprint":false},{"year":2018,"finding":"PRMT2 associates with the actin nucleator Cobl through its SH3 domain and methylates Cobl's C-terminal actin-nucleating domain. This methylation is required for Cobl's actin-binding activity and its role in dendritic arborization of neurons. PRMT2 phenocopies Cobl in gain- and loss-of-function assays, and both its catalytic domain and SH3 domain are required for its effects on dendritogenesis.","method":"Co-immunoprecipitation, in vitro reconstitution, cellular reconstitution, in vitro methylation assay, gain/loss-of-function in neurons, actin-binding assay","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution of methylation, actin-binding functional assay with methylation requirement, domain mutagenesis, cellular and in vivo neuronal phenotypes; multiple orthogonal methods","pmids":["29689199"],"is_preprint":false},{"year":2020,"finding":"PRMT2 mediates H3R8me2a at the Bcl2 gene promoter, increasing chromatin accessibility for STAT3 and promoting Bcl2 expression. A catalytically inactive PRMT2 mutant or the type I PRMT inhibitor MS023 impairs these pro-tumorigenic functions in hepatocellular carcinoma cells.","method":"ChIP assay, catalytic mutant expression, PRMT inhibitor (MS023) treatment, apoptosis and proliferation assays","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP evidence for H3R8me2a at Bcl2 promoter, catalytic mutant and pharmacological inhibitor validation; single lab","pmids":["32574605"],"is_preprint":false},{"year":2021,"finding":"PRMT2 methylates TLR4 at R731 and R812 (catalyzed via residues M115), and methylates IRF3 at R285. Arginine methylation of TLR4 at R812 mediates TLR4-IRF3 interaction; methylation of IRF3 at R285 induces IRF3 dimerization and nuclear translocation, promoting IFN-β production via TLR4/IRF3 signaling. PRMT2 mutants H112Q and M115I and TLR4 R812K mutant reduce IRF3 transcriptional activity.","method":"Co-immunoprecipitation, in vitro methylation assay, site-directed mutagenesis, nuclear fractionation, luciferase reporter assay, IFN-β measurement","journal":"Molecular immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — site-directed mutagenesis of active site and substrates, Co-IP, nuclear fractionation; single lab with multiple methods","pmids":["34583098"],"is_preprint":false},{"year":2021,"finding":"PRMT2 deposits repressive H3R8me2a at the SOCS3 promoter in colitis, inhibiting SOCS3 expression. Reduced SOCS3 prevents ubiquitination-mediated degradation of TRAF5, elevating TRAF5 and activating downstream NF-κB/MAPK signaling. PRMT2 overexpression aggravates and knockdown alleviates DSS-induced colitis.","method":"ChIP assay, lentiviral overexpression/knockdown in vivo, Western blot, DSS colitis mouse model","journal":"British journal of pharmacology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP for H3R8me2a at SOCS3 promoter, in vivo genetic manipulation, pathway protein level readout; single lab","pmids":["34599829"],"is_preprint":false},{"year":2022,"finding":"PRMT2 arginine-methylates BRD4 at R179, R181, and R183 (with PRMT4). This methylation promotes BRD4 recruitment to acetylated histones/chromatin, controls a transcriptional program, and is induced by DNA damage to promote BRD4 chromatin binding for DNA repair. BRD4 arginine methylation deficiency suppresses tumor growth and sensitizes cells to BET inhibitors and DNA damaging agents.","method":"Co-immunoprecipitation, in vitro methylation assay, ChIP assay, site-directed mutagenesis, tumor xenograft, drug sensitivity assay","journal":"Science advances","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro methylation with site-mapped mutagenesis, ChIP for chromatin recruitment, functional DNA-repair and transcription readouts, in vivo tumor model; multiple orthogonal methods","pmids":["36475791"],"is_preprint":false},{"year":2023,"finding":"PRMT2 promotes HIV-1 latency by methylating HIV-1 Tat at R52, reinforcing Tat nucleolar sequestration by NPM1 and counteracting its incorporation into Super Elongation Complex (SEC) phase-separated condensates in the nucleoplasm, thereby inactivating Tat-dependent viral transcription.","method":"cDNA expression screening, co-immunoprecipitation, nucleolar/nuclear fractionation, phase-separation imaging, methylation assay, HIV latency cell line models, patient CD4+ T cell experiments","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — substrate methylation mapped to R52 with functional consequence (nucleolar retention vs. condensate formation), multiple cell models including patient cells, multiple orthogonal methods","pmids":["37949879"],"is_preprint":false},{"year":2023,"finding":"PRMT2-mediated H3R8me2a is enriched at the WNT5A promoter, enhancing WNT5A transcriptional expression and activating Wnt signaling to drive RCC malignant progression.","method":"ChIP assay, overexpression/knockdown in cell lines, in vivo xenograft","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP evidence for H3R8me2a at WNT5A promoter, in vitro and in vivo functional readouts; single lab","pmids":["37173306"],"is_preprint":false},{"year":2024,"finding":"PRMT2 is activated by HIF1α under hypoxic conditions and its H3R8me2a activity is required for transcriptional activation of a subset of hypoxia-induced genes, driving glioblastoma cell migration and tumor progression.","method":"ChIP assay, HIF1α knockdown/overexpression, PRMT2 inactivation, mouse xenograft, clinical specimen correlation","journal":"Cellular signalling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic manipulation of HIF1α-PRMT2 axis with ChIP and in vivo tumor model; single lab","pmids":["38341123"],"is_preprint":false},{"year":2024,"finding":"PRMT2 promotes arginine methylation of β-catenin, inducing its proteasomal degradation, which transcriptionally inhibits GPX4 expression. This leads to ferroptosis and M1 polarization of microglia via the β-catenin-GPX4 axis in LPS-induced neuroinflammation and depression.","method":"Co-immunoprecipitation, Western blot (ubiquitination/degradation), siRNA knockdown, behavioral assays in mice","journal":"Molecular neurobiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — substrate (β-catenin) methylation with defined degradation consequence, pathway validation by KD; single lab, multiple methods","pmids":["38430350"],"is_preprint":false},{"year":2024,"finding":"C15orf39 (PRMT2 IP) interacts with cytoplasmic PRMT2 and together they stabilize IκBα to suppress NF-κB signaling and reduce IL-6/TNF-α transcription in microglia under steady-state conditions.","method":"Co-immunoprecipitation, Western blot (IκBα levels), siRNA/overexpression, NF-κB reporter assay","journal":"International journal of molecular sciences","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single Co-IP and expression readouts; mechanism of PRMT2-IκBα stabilization not directly demonstrated at enzymatic level","pmids":["38892217"],"is_preprint":false},{"year":2025,"finding":"Hypoxia triggers phosphorylation of PRMT2 at Serine 12 (within its N-terminal intrinsically disordered region) by CDK9, driving PRMT2 condensation into transcriptional condensates, which is required for its H3R8me2a activity and hypoxia-inducible gene expression in glioblastoma.","method":"Phosphorylation site mutagenesis, CDK9 inhibitor (TG02), condensate imaging, ChIP for H3R8me2a, in vivo xenograft","journal":"Science China. Life sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — site-specific phosphorylation mutant with functional consequence on condensate formation and H3R8me2a, pharmacological CDK9 inhibition, in vivo validation; single lab","pmids":["40926175"],"is_preprint":false},{"year":2025,"finding":"PADI4 citrullinates PRMT2 at R312, which stabilizes PRMT2 protein expression and enhances its function in promoting H3R8 histone arginine methylation-dependent transcription of ID1 and ID2. Citrullination also affects PRMT2 interaction with the deubiquitinase USP7. R312 mutation or GSK484 PADI4 inhibition reduces PRMT2 activity, stem-like properties, and cisplatin resistance in OSCC.","method":"Immunoprecipitation, Western blot (protein stability), ChIP, site-directed mutagenesis (R312), PADI4 inhibitor (GSK484), cancer stem cell assays","journal":"Clinical and translational medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — citrullination site mapped with mutagenesis, functional consequence on PRMT2 stability and histone methylation demonstrated; single lab","pmids":["40078091"],"is_preprint":false},{"year":2025,"finding":"In trigeminal neuropathic pain, nerve injury upregulates PRMT2 in sensory neurons, which promotes H3R8 asymmetric dimethylation at the miR-323-3p promoter, facilitating FOXA2 binding and upregulating miR-323-3p expression. Increased miR-323-3p reduces Kv2.1 potassium channel expression and currents, causing TG neuronal hyperexcitability.","method":"High-throughput sequencing, ChIP assay, siRNA knockdown, patch-clamp electrophysiology, in vivo pain behavioral assays","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP evidence for H3R8me2a at miR-323-3p promoter, FOXA2 binding, electrophysiology readout, in vivo validation; single lab with multiple methods","pmids":["40674210"],"is_preprint":false}],"current_model":"PRMT2 is a type I protein arginine methyltransferase containing a unique N-terminal SH3 domain that mediates substrate and partner interactions; it deposits asymmetric dimethylarginine on histone H3R8 (H3R8me2a) at gene promoters to regulate transcription, methylates cytoplasmic and nuclear substrates including BRD4, Cobl, TLR4, IRF3, β-catenin, and HIV-1 Tat, and acts as a transcriptional co-activator for nuclear hormone receptors (AR, ERα) and an RB-dependent repressor of E2F1, with its catalytic activity and SH3 domain both required for key functions such as neuronal dendritogenesis, innate immune signaling, and cell-cycle control."},"narrative":{"mechanistic_narrative":"PRMT2 is a type I protein arginine methyltransferase that couples substrate methylation to transcriptional and signaling control, deploying an N-terminal protein-interaction module to recruit substrates and partners while its methyltransferase core deposits asymmetric dimethylarginine [PMID:29689199, PMID:30382083]. In the nucleus, its principal chromatin activity is asymmetric dimethylation of histone H3 at arginine 8 (H3R8me2a), which it installs at gene promoters and enhancers to activate oncogenic and stimulus-responsive transcriptional programs, including cell-cycle, Bcl2, WNT5A, and hypoxia-induced genes across glioblastoma, hepatocellular carcinoma, and renal cell carcinoma [PMID:30382083, PMID:32574605, PMID:37173306, PMID:38341123]. PRMT2 also methylates a spectrum of non-histone substrates with distinct functional outcomes: it methylates BRD4 to promote its chromatin recruitment for transcription and DNA repair [PMID:36475791], TLR4 and IRF3 to drive IRF3 dimerization and IFN-β production [PMID:34583098], HIV-1 Tat at R52 to enforce nucleolar sequestration and viral latency [PMID:37949879], β-catenin to trigger its proteasomal degradation and downstream GPX4 repression [PMID:38430350], and the actin nucleator Cobl, a modification required for Cobl actin-binding activity in neuronal dendritogenesis [PMID:29689199]. Independent of, or in concert with, its catalytic activity PRMT2 acts as a co-activator for nuclear hormone receptors AR and ERα and as an RB-dependent repressor of E2F1 transcriptional activity, with PRMT2-null cells showing elevated E2F activity and accelerated S-phase entry [PMID:17587566, PMID:22093364, PMID:16616919]. Its protein-interaction domain engages partners including the hnRNP E1B-AP5, the splicing factor SAM68, and Cobl, linking PRMT2 to RGG-box methylation, BCL-X alternative splicing, and cytoskeletal regulation [PMID:11513728, PMID:28057797, PMID:29689199]. PRMT2 function is itself tuned by post-translational regulation—CDK9 phosphorylation at Ser12 drives its condensation into transcriptional condensates required for H3R8me2a activity, and PADI4-mediated citrullination at R312 stabilizes the protein [PMID:40926175, PMID:40078091].","teleology":[{"year":1998,"claim":"Established PRMT2 as a candidate arginine methyltransferase, placing it within a family whose catalytic conservation was demonstrated for its paralog.","evidence":"Sequence analysis with yeast complementation and in vitro methyltransferase assay of the paralog HRMT1L2","pmids":["9545638"],"confidence":"Medium","gaps":["PRMT2 itself assigned by homology, not direct enzymatic assay","no substrate identified at this stage"]},{"year":2001,"claim":"Showed PRMT2's N-terminal domain mediates partner binding, identifying the first interactor and a candidate nuclear methylation substrate.","evidence":"Yeast two-hybrid, immunofluorescence co-localization and domain-deletion analysis with the hnRNP E1B-AP5","pmids":["11513728"],"confidence":"Medium","gaps":["direct in vitro methylation of E1B-AP5 by PRMT2 not demonstrated","functional consequence of methylation unknown"]},{"year":2006,"claim":"Defined a cell-cycle role by showing PRMT2 represses E2F1 in an RB-dependent manner, the first genetic loss-of-function phenotype.","evidence":"Co-IP, reporter assays, PRMT2-knockout MEFs with cell-cycle analysis and vascular injury model","pmids":["16616919"],"confidence":"High","gaps":["whether repression requires catalytic methylation not resolved","no direct chromatin substrate at E2F target genes identified"]},{"year":2007,"claim":"Identified PRMT2 as a nuclear hormone receptor co-activator with catalytic activity required and ligand-dependent nuclear co-translocation.","evidence":"Yeast two-hybrid, luciferase reporter, immunofluorescence and methyltransferase-inhibitor treatment with androgen receptor","pmids":["17587566"],"confidence":"Medium","gaps":["substrate methylated during coactivation not identified","single lab"]},{"year":2011,"claim":"Extended coactivator function to ERα and connected PRMT2 to E2F1-driven proliferation, while showing splice variants partition to distinct compartments.","evidence":"Confocal microscopy, GST pulldown, Co-IP, reporter assays and siRNA in ERα systems","pmids":["22093364"],"confidence":"Medium","gaps":["catalytic requirement for ERα coactivation not tested","functional roles of individual splice variants incompletely separated"]},{"year":2011,"claim":"Linked PRMT2 to innate immune signaling in vivo through control of NF-κB nuclear accumulation.","evidence":"Prmt2 mouse knockout/monosomy model, cytokine measurement and NF-κB nuclear fractionation","pmids":["21957146"],"confidence":"Medium","gaps":["molecular mechanism connecting PRMT2 to NF-κB not defined","no substrate identified"]},{"year":2015,"claim":"Placed PRMT2 in macrophage lipid handling via LXR-dependent ABCA1 expression and cholesterol efflux.","evidence":"Prmt2-knockout BMDMs with cholesterol efflux assay and gene expression analysis","pmids":["26288135"],"confidence":"Medium","gaps":["mechanism of PRMT2 action on LXR/ABCA1 not resolved","catalytic dependence untested"]},{"year":2017,"claim":"Revealed an SH3-domain-mediated link to alternative splicing through SAM68 and BCL-X isoform control.","evidence":"SH3-domain proteomics, Co-IP and RT-PCR BCL-X isoform analysis","pmids":["28057797"],"confidence":"Medium","gaps":["whether SAM68 is methylated by PRMT2 not established","single lab"]},{"year":2018,"claim":"Identified H3R8me2a as PRMT2's chromatin mark and tied its catalytic activity to oncogenic transcription, the central nuclear mechanism.","evidence":"ChIP-seq, knockdown, catalytic-mutant expression and tumor models in glioblastoma","pmids":["30382083"],"confidence":"High","gaps":["recruitment mechanism of PRMT2 to specific promoters not defined","reader of H3R8me2a not identified here"]},{"year":2018,"claim":"Demonstrated a direct non-histone substrate (Cobl) with reconstituted methylation controlling actin nucleation and dendritogenesis, requiring both catalytic and SH3 domains.","evidence":"In vitro and cellular reconstitution, in vitro methylation, actin-binding assay and neuronal gain/loss-of-function","pmids":["29689199"],"confidence":"High","gaps":["methylated arginine residues on Cobl not enumerated in summary","in vivo neuronal circuit consequences beyond arborization untested"]},{"year":2020,"claim":"Connected H3R8me2a to chromatin accessibility, showing it opens the Bcl2 promoter for STAT3 binding.","evidence":"ChIP, catalytic-mutant and MS023 inhibitor treatment with apoptosis/proliferation assays in HCC","pmids":["32574605"],"confidence":"Medium","gaps":["direct biochemical link between H3R8me2a and STAT3 recruitment not shown","single lab"]},{"year":2021,"claim":"Mapped PRMT2 methylation of TLR4 and IRF3 to defined arginines, establishing a methylation-driven IFN-β signaling cascade.","evidence":"Co-IP, in vitro methylation, active-site and substrate mutagenesis, nuclear fractionation and IFN-β reporter assays","pmids":["34583098"],"confidence":"Medium","gaps":["stoichiometry and in vivo relevance of these methylations untested","single lab"]},{"year":2021,"claim":"Showed H3R8me2a can act repressively, silencing SOCS3 to stabilize TRAF5 and activate NF-κB/MAPK in colitis.","evidence":"ChIP, in vivo lentiviral overexpression/knockdown and DSS colitis model","pmids":["34599829"],"confidence":"Medium","gaps":["mechanism of activating versus repressive H3R8me2a outcomes unresolved","single lab"]},{"year":2022,"claim":"Defined BRD4 as a methylation substrate, linking PRMT2 to chromatin reader recruitment, transcription, and DNA-damage repair with therapeutic implications.","evidence":"In vitro methylation with site-mapped mutagenesis, ChIP, xenograft and drug-sensitivity assays","pmids":["36475791"],"confidence":"High","gaps":["relative contribution of PRMT2 versus PRMT4 to BRD4 methylation not partitioned","signal triggering DNA-damage-induced methylation undefined"]},{"year":2023,"claim":"Uncovered an antiviral/latency role: PRMT2 methylates HIV-1 Tat at R52 to retain it in nucleoli and exclude it from transcriptional condensates.","evidence":"cDNA screening, Co-IP, fractionation, phase-separation imaging, methylation assay and latency/patient CD4+ T cell models","pmids":["37949879"],"confidence":"High","gaps":["host substrates governing latency reactivation untested","interplay with cellular transcription condensates not generalized"]},{"year":2023,"claim":"Extended the oncogenic H3R8me2a program to WNT5A/Wnt signaling in renal cell carcinoma.","evidence":"ChIP, overexpression/knockdown and xenograft","pmids":["37173306"],"confidence":"Medium","gaps":["recruitment to the WNT5A promoter undefined","single lab"]},{"year":2024,"claim":"Placed PRMT2 downstream of HIF1α, showing its H3R8me2a activity drives a subset of hypoxia-induced genes and tumor migration.","evidence":"ChIP, HIF1α manipulation, PRMT2 inactivation, xenograft and clinical correlation","pmids":["38341123"],"confidence":"Medium","gaps":["mechanism of HIF1α-driven PRMT2 activation not detailed here","single lab"]},{"year":2024,"claim":"Identified β-catenin methylation by PRMT2 driving its degradation and a β-catenin-GPX4 ferroptosis/microglial polarization axis in neuroinflammation.","evidence":"Co-IP, ubiquitination/degradation Western blots, siRNA and mouse behavioral assays","pmids":["38430350"],"confidence":"Medium","gaps":["methylated arginine on β-catenin not mapped","link to E3 ligase activity undefined"]},{"year":2024,"claim":"Proposed a cytoplasmic anti-inflammatory function via C15orf39-PRMT2 stabilization of IκBα to dampen NF-κB.","evidence":"Co-IP, IκBα Western blots, siRNA/overexpression and NF-κB reporter in microglia","pmids":["38892217"],"confidence":"Low","gaps":["enzymatic basis of IκBα stabilization not demonstrated","single Co-IP without reciprocal/in vitro validation","reconciliation with PRMT2's NF-κB-promoting roles unresolved"]},{"year":2025,"claim":"Showed PRMT2 activity is gated by CDK9 phosphorylation at Ser12, which drives condensate formation required for H3R8me2a under hypoxia.","evidence":"Phospho-site mutagenesis, CDK9 inhibitor TG02, condensate imaging, ChIP and xenograft","pmids":["40926175"],"confidence":"Medium","gaps":["condensate composition not defined","single lab"]},{"year":2025,"claim":"Demonstrated citrullination of PRMT2 at R312 by PADI4 as a stabilizing modification enhancing its histone methylation and stem-like phenotypes.","evidence":"IP, protein stability Western blots, ChIP, R312 mutagenesis and PADI4 inhibitor GSK484 in OSCC","pmids":["40078091"],"confidence":"Medium","gaps":["role of USP7 interaction in stabilization not fully resolved","single lab"]},{"year":2025,"claim":"Linked PRMT2 H3R8me2a to neuronal excitability in pain via FOXA2-dependent miR-323-3p induction and Kv2.1 suppression.","evidence":"Sequencing, ChIP, siRNA, patch-clamp and in vivo pain behavior","pmids":["40674210"],"confidence":"Medium","gaps":["recruitment of PRMT2 to the miR-323-3p promoter undefined","single lab"]},{"year":null,"claim":"How PRMT2 is targeted to specific promoters and how the same H3R8me2a mark produces activating versus repressive transcriptional outcomes remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["no defined reader of H3R8me2a","context-specific recruitment factors unknown","rules distinguishing activating from repressive deposition undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016740","term_label":"transferase activity","supporting_discovery_ids":[8,9,11,13,14]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[9,11,13,14,17]},{"term_id":"GO:0042393","term_label":"histone binding","supporting_discovery_ids":[8,10,13]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[2,3,4,8]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[2,3,4]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[1,3,8]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[3,18]},{"term_id":"GO:0005730","term_label":"nucleolus","supporting_discovery_ids":[14]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[8,10,15,16]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[5,11,12,18]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[2,4]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[13]},{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[8,13]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[11,15,17]}],"complexes":[],"partners":["RB1","E2F1","AR","ESR1","SAM68","COBL","BRD4","C15ORF39"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P55345","full_name":"Protein arginine N-methyltransferase 2","aliases":["Histone-arginine N-methyltransferase PRMT2"],"length_aa":433,"mass_kda":49.0,"function":"Arginine methyltransferase that methylates the guanidino nitrogens of arginyl residues in proteins such as STAT3, FBL, histone H4 (PubMed:19405910). Acts as a coactivator (with NCOA2) of the androgen receptor (AR)-mediated transactivation (PubMed:17587566). Acts as a coactivator (with estrogen) of estrogen receptor (ER)-mediated transactivation (PubMed:12039952). Enhances PGR, PPARG, RARA-mediated transactivation (PubMed:12039952). May inhibit NF-kappa-B transcription and promote apoptosis (PubMed:16648481). Represses E2F1 transcriptional activity (in a RB1-dependent manner) (By similarity). May be involved in growth regulation (By similarity). Involved in C15ORF39-mediated inhibition of the microglial inflammatory responses through suppression of NF-kappa-B signaling, thereby reducing the production of pro-inflammatory cytokines (PubMed:38892217)","subcellular_location":"Cytoplasm; Nucleus","url":"https://www.uniprot.org/uniprotkb/P55345/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/PRMT2","classification":"Not Classified","n_dependent_lines":6,"n_total_lines":1208,"dependency_fraction":0.004966887417218543},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/PRMT2","total_profiled":1310},"omim":[{"mim_id":"621142","title":"CHROMOSOME 15 OPEN READING FRAME 39; C15ORF39","url":"https://www.omim.org/entry/621142"},{"mim_id":"608274","title":"PROTEIN ARGININE METHYLTRANSFERASE 6; PRMT6","url":"https://www.omim.org/entry/608274"},{"mim_id":"602950","title":"PROTEIN ARGININE METHYLTRANSFERASE 1; PRMT1","url":"https://www.omim.org/entry/602950"},{"mim_id":"601961","title":"PROTEIN ARGININE METHYLTRANSFERASE 2; PRMT2","url":"https://www.omim.org/entry/601961"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"},{"location":"Cytosol","reliability":"Supported"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/PRMT2"},"hgnc":{"alias_symbol":["MGC111373"],"prev_symbol":["HRMT1L1"]},"alphafold":{"accession":"P55345","domains":[{"cath_id":"2.30.30.40","chopping":"32-91","consensus_level":"high","plddt":88.0012,"start":32,"end":91},{"cath_id":"3.40.50.150","chopping":"106-211","consensus_level":"high","plddt":98.3102,"start":106,"end":211},{"cath_id":"2.70.160.11","chopping":"244-430","consensus_level":"high","plddt":97.6649,"start":244,"end":430}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P55345","model_url":"https://alphafold.ebi.ac.uk/files/AF-P55345-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P55345-F1-predicted_aligned_error_v6.png","plddt_mean":91.88},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=PRMT2","jax_strain_url":"https://www.jax.org/strain/search?query=PRMT2"},"sequence":{"accession":"P55345","fasta_url":"https://rest.uniprot.org/uniprotkb/P55345.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P55345/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P55345"}},"corpus_meta":[{"pmid":"9545638","id":"PMC_9545638","title":"Identification and characterization of two putative human arginine methyltransferases (HRMT1L1 and HRMT1L2).","date":"1998","source":"Genomics","url":"https://pubmed.ncbi.nlm.nih.gov/9545638","citation_count":152,"is_preprint":false},{"pmid":"30382083","id":"PMC_30382083","title":"PRMT2 links histone H3R8 asymmetric dimethylation to oncogenic activation and tumorigenesis of glioblastoma.","date":"2018","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/30382083","citation_count":96,"is_preprint":false},{"pmid":"16616919","id":"PMC_16616919","title":"The arginine methyltransferase PRMT2 binds RB and regulates E2F function.","date":"2006","source":"Experimental cell research","url":"https://pubmed.ncbi.nlm.nih.gov/16616919","citation_count":72,"is_preprint":false},{"pmid":"17587566","id":"PMC_17587566","title":"PRMT2, a member of the protein arginine methyltransferase family, is a coactivator of the androgen receptor.","date":"2007","source":"The Journal of steroid biochemistry and 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of the PRMT2 Protein Arginine Methyltransferase.","date":"2021","source":"Life (Basel, Switzerland)","url":"https://pubmed.ncbi.nlm.nih.gov/34833139","citation_count":34,"is_preprint":false},{"pmid":"26288135","id":"PMC_26288135","title":"LXR-Mediated ABCA1 Expression and Function Are Modulated by High Glucose and PRMT2.","date":"2015","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/26288135","citation_count":34,"is_preprint":false},{"pmid":"21820040","id":"PMC_21820040","title":"Identification and expression analysis of a novel transcript of the human PRMT2 gene resulted from alternative polyadenylation in breast cancer.","date":"2011","source":"Gene","url":"https://pubmed.ncbi.nlm.nih.gov/21820040","citation_count":30,"is_preprint":false},{"pmid":"28057797","id":"PMC_28057797","title":"PRMT2 interacts with splicing factors and regulates the alternative splicing of BCL-X.","date":"2017","source":"Journal of 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1950)","url":"https://pubmed.ncbi.nlm.nih.gov/21957146","citation_count":23,"is_preprint":false},{"pmid":"38430350","id":"PMC_38430350","title":"Arginine Methylation of β-Catenin Induced by PRMT2 Aggravates LPS-Induced Cognitive Dysfunction and Depression-Like Behaviors by Promoting Ferroptosis.","date":"2024","source":"Molecular neurobiology","url":"https://pubmed.ncbi.nlm.nih.gov/38430350","citation_count":22,"is_preprint":false},{"pmid":"34599829","id":"PMC_34599829","title":"Protein arginine methyltransferase 2 (PRMT2) promotes dextran sulfate sodium-induced colitis by inhibiting the SOCS3 promoter via histone H3R8 asymmetric dimethylation.","date":"2021","source":"British journal of pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/34599829","citation_count":20,"is_preprint":false},{"pmid":"34583098","id":"PMC_34583098","title":"Arginine methylation by PRMT2 promotes IFN-β production through TLR4/IRF3 signaling pathway.","date":"2021","source":"Molecular immunology","url":"https://pubmed.ncbi.nlm.nih.gov/34583098","citation_count":18,"is_preprint":false},{"pmid":"37949879","id":"PMC_37949879","title":"PRMT2 promotes HIV-1 latency by preventing nucleolar exit and phase separation of Tat into the Super Elongation Complex.","date":"2023","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/37949879","citation_count":13,"is_preprint":false},{"pmid":"35835907","id":"PMC_35835907","title":"Loss of PRMT2 in myeloid cells in normoglycemic mice phenocopies impaired regression of atherosclerosis in diabetic mice.","date":"2022","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/35835907","citation_count":13,"is_preprint":false},{"pmid":"28677794","id":"PMC_28677794","title":"PRMT2β, a C-terminal splice variant of PRMT2, inhibits the growth of breast cancer cells.","date":"2017","source":"Oncology 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signalling","url":"https://pubmed.ncbi.nlm.nih.gov/38341123","citation_count":7,"is_preprint":false},{"pmid":"37523410","id":"PMC_37523410","title":"Arginine methyltransferases PRMT2 and PRMT3 are essential for biosynthesis of plant-polysaccharide-degrading enzymes in Penicillium oxalicum.","date":"2023","source":"PLoS genetics","url":"https://pubmed.ncbi.nlm.nih.gov/37523410","citation_count":7,"is_preprint":false},{"pmid":"40078091","id":"PMC_40078091","title":"PADI4 facilitates stem-like properties and cisplatin resistance through upregulating PRMT2/IDs family in oesophageal squamous cell carcinoma.","date":"2025","source":"Clinical and translational medicine","url":"https://pubmed.ncbi.nlm.nih.gov/40078091","citation_count":6,"is_preprint":false},{"pmid":"40769293","id":"PMC_40769293","title":"PRMT2 promotes tumorigenic phenotypes through the Wnt signaling pathway and drives immune suppression in Colorectal cancer.","date":"2025","source":"Cancer letters","url":"https://pubmed.ncbi.nlm.nih.gov/40769293","citation_count":4,"is_preprint":false},{"pmid":"40926175","id":"PMC_40926175","title":"Transcriptional condensates enrich phosphorylated PRMT2 to stimulate H3R8me2a deposition and hypoxic response in glioblastoma.","date":"2025","source":"Science China. Life sciences","url":"https://pubmed.ncbi.nlm.nih.gov/40926175","citation_count":4,"is_preprint":false},{"pmid":"24502989","id":"PMC_24502989","title":"Identification of splice variants, expression analysis and single nucleotide polymorphisms of the PRMT2 gene in dairy cattle.","date":"2014","source":"Gene","url":"https://pubmed.ncbi.nlm.nih.gov/24502989","citation_count":4,"is_preprint":false},{"pmid":"38892217","id":"PMC_38892217","title":"Human C15orf39 Inhibits Inflammatory Response via PRMT2 in Human Microglial HMC3 Cell Line.","date":"2024","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/38892217","citation_count":3,"is_preprint":false},{"pmid":"40674210","id":"PMC_40674210","title":"PRMT2-mediated upregulation of miR-323-3p in sensory neurons promotes trigeminal neuropathic pain by targeting Kv2.1 channels.","date":"2025","source":"Cell reports","url":"https://pubmed.ncbi.nlm.nih.gov/40674210","citation_count":1,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":18634,"output_tokens":5650,"usd":0.070326,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":14214,"output_tokens":6052,"usd":0.111185,"stage2_stop_reason":"end_turn"},"total_usd":0.181511,"stage1_batch_id":"msgbatch_01CNoDbkChHEkgrJnL7BwtGJ","stage2_batch_id":"msgbatch_016Y4x9E9Wg5VQDANj9quSQD","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1998,\n      \"finding\": \"PRMT2 (HRMT1L1) contains an N-terminal SH2 domain in addition to a methyltransferase core domain. The paralog HRMT1L2 (PRMT1) exhibited in vitro methyltransferase activity and complemented a yeast HMT1 mutant in vivo, establishing functional conservation; PRMT2 itself was identified as a putative arginine methyltransferase based on sequence homology.\",\n      \"method\": \"Sequence analysis, yeast complementation assay, in vitro methyltransferase assay (for HRMT1L2)\",\n      \"journal\": \"Genomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — yeast complementation and in vitro assay for the paralog; PRMT2 itself identified by homology with structural domain annotation, single study\",\n      \"pmids\": [\"9545638\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"PRMT2 (HRMT1L1) interacts with the hnRNP E1B-AP5 via its SH3 domain (not SH2), co-localizes with E1B-AP5 in the nuclear fraction, and was identified as a candidate methyltransferase responsible for in vivo RGG-box methylation of E1B-AP5.\",\n      \"method\": \"Yeast two-hybrid screening, in situ immunofluorescence co-localization, domain-deletion analysis\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — yeast two-hybrid plus immunofluorescence co-localization; direct enzymatic proof of E1B-AP5 methylation by PRMT2 not fully demonstrated in vitro in the abstract\",\n      \"pmids\": [\"11513728\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"PRMT2 directly binds RB through its AdoMet-binding domain (unlike PRMT1, PRMT3, PRMT4), forms a ternary complex with E2F1 in the presence of RB, represses E2F1 transcriptional activity in an RB-dependent manner, and PRMT2 knockout MEFs show increased E2F activity and accelerated S-phase entry.\",\n      \"method\": \"Co-immunoprecipitation, reporter assays, gene targeting (knockout MEFs), cell-cycle analysis, vascular injury model\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal binding assays, reporter assays, genetic KO with defined cell-cycle phenotype, replicated with in vivo injury model, multiple orthogonal methods in one study\",\n      \"pmids\": [\"16616919\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"PRMT2 acts as a coactivator of the androgen receptor (AR), interacting with the AR C-terminal region (identified by yeast two-hybrid). PRMT2 coactivation is blocked by a methyltransferase competitive inhibitor, indicating catalytic activity is required. Under androgen-free conditions PRMT2 is cytoplasmic; androgen treatment triggers co-nuclear translocation of AR and PRMT2, whereas AR antagonist hydroxyflutamide causes AR but not PRMT2 nuclear translocation.\",\n      \"method\": \"Yeast two-hybrid, luciferase reporter assays, immunofluorescence, methyltransferase inhibitor treatment\",\n      \"journal\": \"The Journal of steroid biochemistry and molecular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reporter assay with inhibitor evidence for catalytic requirement plus direct localization imaging; single lab, multiple methods\",\n      \"pmids\": [\"17587566\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Three novel C-terminal splice variants of PRMT2 (PRMT2α, PRMT2β, PRMT2γ) have distinct subcellular localizations determined by their alternatively spliced C-termini. All variants bind ERα in vitro and in vivo via their N-terminal regions and enhance ERα-mediated transactivation. PRMT2 silencing enhances 17β-estradiol-induced proliferation by regulating E2F1 and E2F1-responsive genes.\",\n      \"method\": \"Confocal microscopy, GST pulldown, co-immunoprecipitation, luciferase reporter assays, siRNA knockdown\",\n      \"journal\": \"The FEBS journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — binding shown by pulldown and Co-IP, localization by confocal imaging, functional consequence by reporter assay and KD; single lab with multiple methods\",\n      \"pmids\": [\"22093364\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"PRMT2 regulates LPS-induced lung inflammatory responses; Prmt2 gene dosage controls airway hyperresponsiveness, neutrophil recruitment, and IL-6/TNF-α expression. Loss of PRMT2 impairs nuclear accumulation of NF-κB in stimulated macrophages.\",\n      \"method\": \"Mouse knockout/monosomy model, cytokine measurement, NF-κB nuclear fractionation\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic loss-of-function in vivo with defined molecular readout (NF-κB nuclear accumulation); single lab\",\n      \"pmids\": [\"21957146\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"PRMT2 is required for LXR-mediated ABCA1 expression and ABCA1-dependent cholesterol efflux in macrophages; Prmt2-/- bone marrow-derived macrophages show reduced ABCA1 expression and cholesterol efflux. PRMT2 expression is reduced under high-glucose conditions.\",\n      \"method\": \"Prmt2 knockout mouse BMDMs, cholesterol efflux assay, gene expression analysis\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO with direct functional efflux assay; single lab, multiple readouts\",\n      \"pmids\": [\"26288135\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"PRMT2 interacts with the splicing factor SAM68 via its SH3 domain, regulates SAM68 subcellular localization, and promotes an increase in the BCL-XL/BCL-XS ratio in TNF-α or LPS stimulated cells, demonstrating a role in alternative splicing of BCL-X.\",\n      \"method\": \"Proteomics (SH3 domain pulldown/MS), co-immunoprecipitation in cells, RT-PCR BCL-X isoform analysis\",\n      \"journal\": \"Journal of biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — proteomic identification of SH3 interactors confirmed by Co-IP, functional splicing readout; single lab\",\n      \"pmids\": [\"28057797\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"PRMT2 is responsible for histone H3R8 asymmetric dimethylation (H3R8me2a). In glioblastoma, H3R8me2a enrichment at gene promoters/enhancers correlates with active histone marks and is required for oncogenic gene expression programs including cell cycle genes. Silencing or catalytic inactivation of PRMT2 inhibits GBM cell growth and glioblastoma stem cell self-renewal.\",\n      \"method\": \"ChIP-seq, siRNA/shRNA knockdown, catalytic mutant expression, in vitro and in vivo tumor models\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP-seq mapping of H3R8me2a, catalytic mutant validation, loss-of-function phenotype in vitro and in vivo; multiple orthogonal methods\",\n      \"pmids\": [\"30382083\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"PRMT2 associates with the actin nucleator Cobl through its SH3 domain and methylates Cobl's C-terminal actin-nucleating domain. This methylation is required for Cobl's actin-binding activity and its role in dendritic arborization of neurons. PRMT2 phenocopies Cobl in gain- and loss-of-function assays, and both its catalytic domain and SH3 domain are required for its effects on dendritogenesis.\",\n      \"method\": \"Co-immunoprecipitation, in vitro reconstitution, cellular reconstitution, in vitro methylation assay, gain/loss-of-function in neurons, actin-binding assay\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution of methylation, actin-binding functional assay with methylation requirement, domain mutagenesis, cellular and in vivo neuronal phenotypes; multiple orthogonal methods\",\n      \"pmids\": [\"29689199\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"PRMT2 mediates H3R8me2a at the Bcl2 gene promoter, increasing chromatin accessibility for STAT3 and promoting Bcl2 expression. A catalytically inactive PRMT2 mutant or the type I PRMT inhibitor MS023 impairs these pro-tumorigenic functions in hepatocellular carcinoma cells.\",\n      \"method\": \"ChIP assay, catalytic mutant expression, PRMT inhibitor (MS023) treatment, apoptosis and proliferation assays\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP evidence for H3R8me2a at Bcl2 promoter, catalytic mutant and pharmacological inhibitor validation; single lab\",\n      \"pmids\": [\"32574605\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"PRMT2 methylates TLR4 at R731 and R812 (catalyzed via residues M115), and methylates IRF3 at R285. Arginine methylation of TLR4 at R812 mediates TLR4-IRF3 interaction; methylation of IRF3 at R285 induces IRF3 dimerization and nuclear translocation, promoting IFN-β production via TLR4/IRF3 signaling. PRMT2 mutants H112Q and M115I and TLR4 R812K mutant reduce IRF3 transcriptional activity.\",\n      \"method\": \"Co-immunoprecipitation, in vitro methylation assay, site-directed mutagenesis, nuclear fractionation, luciferase reporter assay, IFN-β measurement\",\n      \"journal\": \"Molecular immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — site-directed mutagenesis of active site and substrates, Co-IP, nuclear fractionation; single lab with multiple methods\",\n      \"pmids\": [\"34583098\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"PRMT2 deposits repressive H3R8me2a at the SOCS3 promoter in colitis, inhibiting SOCS3 expression. Reduced SOCS3 prevents ubiquitination-mediated degradation of TRAF5, elevating TRAF5 and activating downstream NF-κB/MAPK signaling. PRMT2 overexpression aggravates and knockdown alleviates DSS-induced colitis.\",\n      \"method\": \"ChIP assay, lentiviral overexpression/knockdown in vivo, Western blot, DSS colitis mouse model\",\n      \"journal\": \"British journal of pharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP for H3R8me2a at SOCS3 promoter, in vivo genetic manipulation, pathway protein level readout; single lab\",\n      \"pmids\": [\"34599829\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"PRMT2 arginine-methylates BRD4 at R179, R181, and R183 (with PRMT4). This methylation promotes BRD4 recruitment to acetylated histones/chromatin, controls a transcriptional program, and is induced by DNA damage to promote BRD4 chromatin binding for DNA repair. BRD4 arginine methylation deficiency suppresses tumor growth and sensitizes cells to BET inhibitors and DNA damaging agents.\",\n      \"method\": \"Co-immunoprecipitation, in vitro methylation assay, ChIP assay, site-directed mutagenesis, tumor xenograft, drug sensitivity assay\",\n      \"journal\": \"Science advances\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro methylation with site-mapped mutagenesis, ChIP for chromatin recruitment, functional DNA-repair and transcription readouts, in vivo tumor model; multiple orthogonal methods\",\n      \"pmids\": [\"36475791\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"PRMT2 promotes HIV-1 latency by methylating HIV-1 Tat at R52, reinforcing Tat nucleolar sequestration by NPM1 and counteracting its incorporation into Super Elongation Complex (SEC) phase-separated condensates in the nucleoplasm, thereby inactivating Tat-dependent viral transcription.\",\n      \"method\": \"cDNA expression screening, co-immunoprecipitation, nucleolar/nuclear fractionation, phase-separation imaging, methylation assay, HIV latency cell line models, patient CD4+ T cell experiments\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — substrate methylation mapped to R52 with functional consequence (nucleolar retention vs. condensate formation), multiple cell models including patient cells, multiple orthogonal methods\",\n      \"pmids\": [\"37949879\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"PRMT2-mediated H3R8me2a is enriched at the WNT5A promoter, enhancing WNT5A transcriptional expression and activating Wnt signaling to drive RCC malignant progression.\",\n      \"method\": \"ChIP assay, overexpression/knockdown in cell lines, in vivo xenograft\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP evidence for H3R8me2a at WNT5A promoter, in vitro and in vivo functional readouts; single lab\",\n      \"pmids\": [\"37173306\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"PRMT2 is activated by HIF1α under hypoxic conditions and its H3R8me2a activity is required for transcriptional activation of a subset of hypoxia-induced genes, driving glioblastoma cell migration and tumor progression.\",\n      \"method\": \"ChIP assay, HIF1α knockdown/overexpression, PRMT2 inactivation, mouse xenograft, clinical specimen correlation\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic manipulation of HIF1α-PRMT2 axis with ChIP and in vivo tumor model; single lab\",\n      \"pmids\": [\"38341123\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"PRMT2 promotes arginine methylation of β-catenin, inducing its proteasomal degradation, which transcriptionally inhibits GPX4 expression. This leads to ferroptosis and M1 polarization of microglia via the β-catenin-GPX4 axis in LPS-induced neuroinflammation and depression.\",\n      \"method\": \"Co-immunoprecipitation, Western blot (ubiquitination/degradation), siRNA knockdown, behavioral assays in mice\",\n      \"journal\": \"Molecular neurobiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — substrate (β-catenin) methylation with defined degradation consequence, pathway validation by KD; single lab, multiple methods\",\n      \"pmids\": [\"38430350\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"C15orf39 (PRMT2 IP) interacts with cytoplasmic PRMT2 and together they stabilize IκBα to suppress NF-κB signaling and reduce IL-6/TNF-α transcription in microglia under steady-state conditions.\",\n      \"method\": \"Co-immunoprecipitation, Western blot (IκBα levels), siRNA/overexpression, NF-κB reporter assay\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single Co-IP and expression readouts; mechanism of PRMT2-IκBα stabilization not directly demonstrated at enzymatic level\",\n      \"pmids\": [\"38892217\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Hypoxia triggers phosphorylation of PRMT2 at Serine 12 (within its N-terminal intrinsically disordered region) by CDK9, driving PRMT2 condensation into transcriptional condensates, which is required for its H3R8me2a activity and hypoxia-inducible gene expression in glioblastoma.\",\n      \"method\": \"Phosphorylation site mutagenesis, CDK9 inhibitor (TG02), condensate imaging, ChIP for H3R8me2a, in vivo xenograft\",\n      \"journal\": \"Science China. Life sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — site-specific phosphorylation mutant with functional consequence on condensate formation and H3R8me2a, pharmacological CDK9 inhibition, in vivo validation; single lab\",\n      \"pmids\": [\"40926175\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"PADI4 citrullinates PRMT2 at R312, which stabilizes PRMT2 protein expression and enhances its function in promoting H3R8 histone arginine methylation-dependent transcription of ID1 and ID2. Citrullination also affects PRMT2 interaction with the deubiquitinase USP7. R312 mutation or GSK484 PADI4 inhibition reduces PRMT2 activity, stem-like properties, and cisplatin resistance in OSCC.\",\n      \"method\": \"Immunoprecipitation, Western blot (protein stability), ChIP, site-directed mutagenesis (R312), PADI4 inhibitor (GSK484), cancer stem cell assays\",\n      \"journal\": \"Clinical and translational medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — citrullination site mapped with mutagenesis, functional consequence on PRMT2 stability and histone methylation demonstrated; single lab\",\n      \"pmids\": [\"40078091\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"In trigeminal neuropathic pain, nerve injury upregulates PRMT2 in sensory neurons, which promotes H3R8 asymmetric dimethylation at the miR-323-3p promoter, facilitating FOXA2 binding and upregulating miR-323-3p expression. Increased miR-323-3p reduces Kv2.1 potassium channel expression and currents, causing TG neuronal hyperexcitability.\",\n      \"method\": \"High-throughput sequencing, ChIP assay, siRNA knockdown, patch-clamp electrophysiology, in vivo pain behavioral assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP evidence for H3R8me2a at miR-323-3p promoter, FOXA2 binding, electrophysiology readout, in vivo validation; single lab with multiple methods\",\n      \"pmids\": [\"40674210\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"PRMT2 is a type I protein arginine methyltransferase containing a unique N-terminal SH3 domain that mediates substrate and partner interactions; it deposits asymmetric dimethylarginine on histone H3R8 (H3R8me2a) at gene promoters to regulate transcription, methylates cytoplasmic and nuclear substrates including BRD4, Cobl, TLR4, IRF3, β-catenin, and HIV-1 Tat, and acts as a transcriptional co-activator for nuclear hormone receptors (AR, ERα) and an RB-dependent repressor of E2F1, with its catalytic activity and SH3 domain both required for key functions such as neuronal dendritogenesis, innate immune signaling, and cell-cycle control.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"PRMT2 is a type I protein arginine methyltransferase that couples substrate methylation to transcriptional and signaling control, deploying an N-terminal protein-interaction module to recruit substrates and partners while its methyltransferase core deposits asymmetric dimethylarginine [#9, #8]. In the nucleus, its principal chromatin activity is asymmetric dimethylation of histone H3 at arginine 8 (H3R8me2a), which it installs at gene promoters and enhancers to activate oncogenic and stimulus-responsive transcriptional programs, including cell-cycle, Bcl2, WNT5A, and hypoxia-induced genes across glioblastoma, hepatocellular carcinoma, and renal cell carcinoma [#8, #10, #15, #16]. PRMT2 also methylates a spectrum of non-histone substrates with distinct functional outcomes: it methylates BRD4 to promote its chromatin recruitment for transcription and DNA repair [#13], TLR4 and IRF3 to drive IRF3 dimerization and IFN-\\u03b2 production [#11], HIV-1 Tat at R52 to enforce nucleolar sequestration and viral latency [#14], \\u03b2-catenin to trigger its proteasomal degradation and downstream GPX4 repression [#17], and the actin nucleator Cobl, a modification required for Cobl actin-binding activity in neuronal dendritogenesis [#9]. Independent of, or in concert with, its catalytic activity PRMT2 acts as a co-activator for nuclear hormone receptors AR and ER\\u03b1 and as an RB-dependent repressor of E2F1 transcriptional activity, with PRMT2-null cells showing elevated E2F activity and accelerated S-phase entry [#3, #4, #2]. Its protein-interaction domain engages partners including the hnRNP E1B-AP5, the splicing factor SAM68, and Cobl, linking PRMT2 to RGG-box methylation, BCL-X alternative splicing, and cytoskeletal regulation [#1, #7, #9]. PRMT2 function is itself tuned by post-translational regulation\\u2014CDK9 phosphorylation at Ser12 drives its condensation into transcriptional condensates required for H3R8me2a activity, and PADI4-mediated citrullination at R312 stabilizes the protein [#19, #20].\",\n  \"teleology\": [\n    {\n      \"year\": 1998,\n      \"claim\": \"Established PRMT2 as a candidate arginine methyltransferase, placing it within a family whose catalytic conservation was demonstrated for its paralog.\",\n      \"evidence\": \"Sequence analysis with yeast complementation and in vitro methyltransferase assay of the paralog HRMT1L2\",\n      \"pmids\": [\"9545638\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"PRMT2 itself assigned by homology, not direct enzymatic assay\", \"no substrate identified at this stage\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Showed PRMT2's N-terminal domain mediates partner binding, identifying the first interactor and a candidate nuclear methylation substrate.\",\n      \"evidence\": \"Yeast two-hybrid, immunofluorescence co-localization and domain-deletion analysis with the hnRNP E1B-AP5\",\n      \"pmids\": [\"11513728\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"direct in vitro methylation of E1B-AP5 by PRMT2 not demonstrated\", \"functional consequence of methylation unknown\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Defined a cell-cycle role by showing PRMT2 represses E2F1 in an RB-dependent manner, the first genetic loss-of-function phenotype.\",\n      \"evidence\": \"Co-IP, reporter assays, PRMT2-knockout MEFs with cell-cycle analysis and vascular injury model\",\n      \"pmids\": [\"16616919\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"whether repression requires catalytic methylation not resolved\", \"no direct chromatin substrate at E2F target genes identified\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Identified PRMT2 as a nuclear hormone receptor co-activator with catalytic activity required and ligand-dependent nuclear co-translocation.\",\n      \"evidence\": \"Yeast two-hybrid, luciferase reporter, immunofluorescence and methyltransferase-inhibitor treatment with androgen receptor\",\n      \"pmids\": [\"17587566\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"substrate methylated during coactivation not identified\", \"single lab\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Extended coactivator function to ER\\u03b1 and connected PRMT2 to E2F1-driven proliferation, while showing splice variants partition to distinct compartments.\",\n      \"evidence\": \"Confocal microscopy, GST pulldown, Co-IP, reporter assays and siRNA in ER\\u03b1 systems\",\n      \"pmids\": [\"22093364\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"catalytic requirement for ER\\u03b1 coactivation not tested\", \"functional roles of individual splice variants incompletely separated\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Linked PRMT2 to innate immune signaling in vivo through control of NF-\\u03baB nuclear accumulation.\",\n      \"evidence\": \"Prmt2 mouse knockout/monosomy model, cytokine measurement and NF-\\u03baB nuclear fractionation\",\n      \"pmids\": [\"21957146\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"molecular mechanism connecting PRMT2 to NF-\\u03baB not defined\", \"no substrate identified\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Placed PRMT2 in macrophage lipid handling via LXR-dependent ABCA1 expression and cholesterol efflux.\",\n      \"evidence\": \"Prmt2-knockout BMDMs with cholesterol efflux assay and gene expression analysis\",\n      \"pmids\": [\"26288135\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"mechanism of PRMT2 action on LXR/ABCA1 not resolved\", \"catalytic dependence untested\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Revealed an SH3-domain-mediated link to alternative splicing through SAM68 and BCL-X isoform control.\",\n      \"evidence\": \"SH3-domain proteomics, Co-IP and RT-PCR BCL-X isoform analysis\",\n      \"pmids\": [\"28057797\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"whether SAM68 is methylated by PRMT2 not established\", \"single lab\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Identified H3R8me2a as PRMT2's chromatin mark and tied its catalytic activity to oncogenic transcription, the central nuclear mechanism.\",\n      \"evidence\": \"ChIP-seq, knockdown, catalytic-mutant expression and tumor models in glioblastoma\",\n      \"pmids\": [\"30382083\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"recruitment mechanism of PRMT2 to specific promoters not defined\", \"reader of H3R8me2a not identified here\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Demonstrated a direct non-histone substrate (Cobl) with reconstituted methylation controlling actin nucleation and dendritogenesis, requiring both catalytic and SH3 domains.\",\n      \"evidence\": \"In vitro and cellular reconstitution, in vitro methylation, actin-binding assay and neuronal gain/loss-of-function\",\n      \"pmids\": [\"29689199\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"methylated arginine residues on Cobl not enumerated in summary\", \"in vivo neuronal circuit consequences beyond arborization untested\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Connected H3R8me2a to chromatin accessibility, showing it opens the Bcl2 promoter for STAT3 binding.\",\n      \"evidence\": \"ChIP, catalytic-mutant and MS023 inhibitor treatment with apoptosis/proliferation assays in HCC\",\n      \"pmids\": [\"32574605\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"direct biochemical link between H3R8me2a and STAT3 recruitment not shown\", \"single lab\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Mapped PRMT2 methylation of TLR4 and IRF3 to defined arginines, establishing a methylation-driven IFN-\\u03b2 signaling cascade.\",\n      \"evidence\": \"Co-IP, in vitro methylation, active-site and substrate mutagenesis, nuclear fractionation and IFN-\\u03b2 reporter assays\",\n      \"pmids\": [\"34583098\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"stoichiometry and in vivo relevance of these methylations untested\", \"single lab\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Showed H3R8me2a can act repressively, silencing SOCS3 to stabilize TRAF5 and activate NF-\\u03baB/MAPK in colitis.\",\n      \"evidence\": \"ChIP, in vivo lentiviral overexpression/knockdown and DSS colitis model\",\n      \"pmids\": [\"34599829\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"mechanism of activating versus repressive H3R8me2a outcomes unresolved\", \"single lab\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Defined BRD4 as a methylation substrate, linking PRMT2 to chromatin reader recruitment, transcription, and DNA-damage repair with therapeutic implications.\",\n      \"evidence\": \"In vitro methylation with site-mapped mutagenesis, ChIP, xenograft and drug-sensitivity assays\",\n      \"pmids\": [\"36475791\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"relative contribution of PRMT2 versus PRMT4 to BRD4 methylation not partitioned\", \"signal triggering DNA-damage-induced methylation undefined\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Uncovered an antiviral/latency role: PRMT2 methylates HIV-1 Tat at R52 to retain it in nucleoli and exclude it from transcriptional condensates.\",\n      \"evidence\": \"cDNA screening, Co-IP, fractionation, phase-separation imaging, methylation assay and latency/patient CD4+ T cell models\",\n      \"pmids\": [\"37949879\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"host substrates governing latency reactivation untested\", \"interplay with cellular transcription condensates not generalized\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Extended the oncogenic H3R8me2a program to WNT5A/Wnt signaling in renal cell carcinoma.\",\n      \"evidence\": \"ChIP, overexpression/knockdown and xenograft\",\n      \"pmids\": [\"37173306\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"recruitment to the WNT5A promoter undefined\", \"single lab\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Placed PRMT2 downstream of HIF1\\u03b1, showing its H3R8me2a activity drives a subset of hypoxia-induced genes and tumor migration.\",\n      \"evidence\": \"ChIP, HIF1\\u03b1 manipulation, PRMT2 inactivation, xenograft and clinical correlation\",\n      \"pmids\": [\"38341123\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"mechanism of HIF1\\u03b1-driven PRMT2 activation not detailed here\", \"single lab\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Identified \\u03b2-catenin methylation by PRMT2 driving its degradation and a \\u03b2-catenin-GPX4 ferroptosis/microglial polarization axis in neuroinflammation.\",\n      \"evidence\": \"Co-IP, ubiquitination/degradation Western blots, siRNA and mouse behavioral assays\",\n      \"pmids\": [\"38430350\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"methylated arginine on \\u03b2-catenin not mapped\", \"link to E3 ligase activity undefined\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Proposed a cytoplasmic anti-inflammatory function via C15orf39-PRMT2 stabilization of I\\u03baB\\u03b1 to dampen NF-\\u03baB.\",\n      \"evidence\": \"Co-IP, I\\u03baB\\u03b1 Western blots, siRNA/overexpression and NF-\\u03baB reporter in microglia\",\n      \"pmids\": [\"38892217\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"enzymatic basis of I\\u03baB\\u03b1 stabilization not demonstrated\", \"single Co-IP without reciprocal/in vitro validation\", \"reconciliation with PRMT2's NF-\\u03baB-promoting roles unresolved\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Showed PRMT2 activity is gated by CDK9 phosphorylation at Ser12, which drives condensate formation required for H3R8me2a under hypoxia.\",\n      \"evidence\": \"Phospho-site mutagenesis, CDK9 inhibitor TG02, condensate imaging, ChIP and xenograft\",\n      \"pmids\": [\"40926175\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"condensate composition not defined\", \"single lab\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Demonstrated citrullination of PRMT2 at R312 by PADI4 as a stabilizing modification enhancing its histone methylation and stem-like phenotypes.\",\n      \"evidence\": \"IP, protein stability Western blots, ChIP, R312 mutagenesis and PADI4 inhibitor GSK484 in OSCC\",\n      \"pmids\": [\"40078091\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"role of USP7 interaction in stabilization not fully resolved\", \"single lab\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Linked PRMT2 H3R8me2a to neuronal excitability in pain via FOXA2-dependent miR-323-3p induction and Kv2.1 suppression.\",\n      \"evidence\": \"Sequencing, ChIP, siRNA, patch-clamp and in vivo pain behavior\",\n      \"pmids\": [\"40674210\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"recruitment of PRMT2 to the miR-323-3p promoter undefined\", \"single lab\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How PRMT2 is targeted to specific promoters and how the same H3R8me2a mark produces activating versus repressive transcriptional outcomes remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"no defined reader of H3R8me2a\", \"context-specific recruitment factors unknown\", \"rules distinguishing activating from repressive deposition undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [8, 9, 11, 13, 14]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [9, 11, 13, 14, 17]},\n      {\"term_id\": \"GO:0042393\", \"supporting_discovery_ids\": [8, 10, 13]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [2, 3, 4, 8]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [2, 3, 4]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [1, 3, 8]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [3, 18]},\n      {\"term_id\": \"GO:0005730\", \"supporting_discovery_ids\": [14]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [8, 10, 15, 16]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [5, 11, 12, 18]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [2, 4]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [13]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [8, 13]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [11, 15, 17]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"RB1\", \"E2F1\", \"AR\", \"ESR1\", \"SAM68\", \"Cobl\", \"BRD4\", \"C15orf39\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}