{"gene":"NONO","run_date":"2026-04-29T11:37:57","timeline":{"discoveries":[{"year":1993,"finding":"p54nrb was purified from HeLa cells and found to contain two RNA recognition motifs (RRMs); it shares 71% identity with splicing factor PSF within a 320 aa region including both RRMs, defining the conserved DBHS (Drosophila behavior, human splicing) domain. The protein was identified by cross-reactivity with antibodies against yeast splicing factor PRP18.","method":"Protein purification, cDNA cloning, sequence analysis","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 — original biochemical purification and molecular cloning with domain characterization","pmids":["8371983"],"is_preprint":false},{"year":2001,"finding":"p54nrb forms a multiprotein complex with PSF and matrin 3 that binds specifically and cooperatively to inosine-containing (hyperedited) RNAs and anchors them to the nuclear matrix, thereby retaining promiscuously A-to-I edited RNAs in the nucleus and preventing their export.","method":"HeLa cell nuclear extract fractionation, affinity purification, RNA-binding assays, Xenopus oocyte retention assay","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1 — reconstituted complex from nuclear extracts with functional RNA retention assay in oocyte model","pmids":["11525732"],"is_preprint":false},{"year":2002,"finding":"p54nrb/NonO and PSF are components of paraspeckles, a novel subnuclear compartment in the interchromatin nucleoplasmic space; both proteins interact dynamically with nucleoli in a transcription-dependent manner and relocalize to nucleolar cap structures upon transcription inhibition.","method":"Immunofluorescence, live-cell imaging with YFP-PSP1 stable cell line, transcription inhibition experiments","journal":"Current biology : CB","confidence":"High","confidence_rationale":"Tier 2 — direct live-cell imaging and fractionation with functional consequence (transcription-dependent relocalization)","pmids":["11790299"],"is_preprint":false},{"year":2002,"finding":"PSF and p54nrb/NonO bind specifically to the CTD of RNA polymerase II (both hypo- and hyperphosphorylated forms), co-purify with a pol II holoenzyme, and can interact with the CTD and RNA simultaneously, providing a physical link between pol II and pre-mRNA processing.","method":"Affinity chromatography on immobilized CTD matrices, co-immunoprecipitation with pol II antibodies, RNA-binding assays","journal":"RNA (New York, N.Y.)","confidence":"High","confidence_rationale":"Tier 1-2 — reciprocal co-IP and affinity chromatography with multiple orthogonal methods","pmids":["12358429"],"is_preprint":false},{"year":2002,"finding":"PSF and p54nrb bind U5 snRNA at stem 1b in a sequence- and structure-dependent manner; both proteins associate with spliceosomes and with U4/U6.U5 tri-snRNP.","method":"SELEX/iterative selection, filter-binding assays, RNA affinity selection, sedimentation analysis","journal":"RNA (New York, N.Y.)","confidence":"High","confidence_rationale":"Tier 1 — in vitro biochemical assays with multiple methods defining RNA-binding specificity","pmids":["12403470"],"is_preprint":false},{"year":2004,"finding":"p54nrb associates with the 5' splice site within large complexes containing hyperphosphorylated RNA pol II (RNAPIIO) and U1/U2 snRNPs; p54nrb and PSF can interact directly with the 5' splice site, indicating they mediate contacts between RNAPII and snRNPs during coupled transcription/splicing.","method":"HeLa nuclear extract pull-down, immobilized DNA template assay, co-immunoprecipitation","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1-2 — reconstituted functional elongation complexes with immobilized template assay and direct binding evidence","pmids":["15057275"],"is_preprint":false},{"year":2004,"finding":"The PSF·p54nrb heterodimeric complex stimulates DNA double-strand break rejoining in vitro by cooperating with Ku protein to form a preligation complex with substrate DNA; the four RRM domains in the heterodimer are proposed to align separate DNA molecules.","method":"In vitro NHEJ reconstitution assay with purified proteins, DNA-binding studies","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — reconstituted in vitro NHEJ system with purified complex","pmids":["15590677"],"is_preprint":false},{"year":2005,"finding":"p54nrb forms a heterodimer with PSP1 in vivo; the interaction domain in PSP1 is required for its correct localization to paraspeckles, and an RNA-binding-competent RRM is also required for paraspeckle targeting. Paraspeckle formation depends on ongoing RNA Pol II transcription.","method":"Co-immunoprecipitation, domain mapping, DRB transcription inhibition, live-cell imaging","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods including co-IP, domain mutagenesis, and live imaging with functional consequence","pmids":["16148043"],"is_preprint":false},{"year":2005,"finding":"PSF and p54nrb preferentially bind strong transcriptional activation domains and are required for activator- and CTD-mediated stimulation of pre-mRNA splicing and 3'-end cleavage; PSF overexpression bypasses the requirement for a strong activator.","method":"Affinity chromatography, overexpression in 293 cells, CTD truncation experiments, splicing assays","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods including in vivo functional rescue and in vitro binding","pmids":["16024807"],"is_preprint":false},{"year":2007,"finding":"p54nrb/NonO (p54) physically associates with XRN2 and is required for degradation of 3'-cleaved RNA in vitro; p54 is present along the length of transcribed genes and its siRNA-mediated knockdown leads to defects in XRN2 recruitment and transcription termination.","method":"Co-immunoprecipitation, in vitro 3'-processing assays, ChIP, siRNA knockdown","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 1-2 — in vitro processing assay combined with ChIP and knockdown phenotype","pmids":["17639083"],"is_preprint":false},{"year":2007,"finding":"NONO/p54nrb was identified as a TORC2-interacting protein in the cAMP signaling pathway; NONO is necessary for cAMP-dependent activation of CREB target genes and acts as a bridge between the CREB/TORC complex and RNA polymerase II.","method":"High-throughput coactivator trap screen, RNAi knockdown, ChIP","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2-3 — functional genomic screen plus RNAi and ChIP, single study","pmids":["18077367"],"is_preprint":false},{"year":2007,"finding":"PSF and p54nrb bind AU-rich element (ARE)-containing RNAs including TNFα mRNA; Mnk kinases phosphorylate PSF at two sites, and Mnk-mediated phosphorylation increases PSF binding to TNFα mRNA in living cells.","method":"Proteomic substrate screen, in vitro kinase assays, in vivo phosphorylation, RNA immunoprecipitation","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 — in vitro kinase assay plus in vivo phosphorylation and RNA-IP, single study","pmids":["17965020"],"is_preprint":false},{"year":2008,"finding":"p54nrb physically interacts with Sox9 transcription factor, enhances Sox9-dependent transcriptional activation of the Col2a1 promoter, and is required for maturation of Sox9-target gene mRNA. Loss of p54nrb RNA recognition motifs disrupts paraspeckle bodies, inhibits chondrocyte differentiation, and causes dwarfism in transgenic mice.","method":"Co-immunoprecipitation, reporter assays, siRNA knockdown, transgenic mouse model","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 — multiple methods including co-IP, knockdown, and in vivo transgenic mouse phenotype","pmids":["18677406"],"is_preprint":false},{"year":2009,"finding":"Paraspeckle assembly and function depend on the long noncoding RNA NEAT1; NEAT1 is absent in hESCs and induced upon differentiation, coinciding with paraspeckle formation. Knockdown of NEAT1 in HeLa cells abolishes paraspeckles and enhances nucleocytoplasmic export of mRNAs containing inverted Alu repeats that are normally retained in paraspeckle-associated complexes containing p54nrb.","method":"NEAT1 knockdown, siRNA, mRNA export assays, immunofluorescence","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 — knockdown with functional mRNA export readout, replicated across systems","pmids":["19716791"],"is_preprint":false},{"year":2009,"finding":"MENβ (NEAT1_2) is stabilized by selective association with p54nrb and PSF, which is required for paraspeckle structural integrity; knockdown of MENβ leads to paraspeckle disintegration and prevents reassembly after transcriptional arrest.","method":"RNAi knockdown, immunoprecipitation, transcriptional arrest/recovery assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — RNAi with structural phenotype and reciprocal IP, replicated with multiple methods","pmids":["19188602"],"is_preprint":false},{"year":2009,"finding":"p54nrb is phosphorylated during mitosis at its carboxy-terminal extremity by Cdk1 and at amino-terminal sites by a distinct kinase; p54nrb interacts with the peptidylprolyl isomerase Pin1 through three phosphorylated threonine residues in its proline-rich C-terminus, suggesting regulation by phosphorylation-dependent conformational changes upon mitotic entry.","method":"Mitosis-specific phospho-antibodies (CC-3, MPM-2), CDK inhibitor (roscovitine), immunodepletion of cyclin B1, site-directed mutagenesis, Pin1 interaction assays","journal":"Journal of molecular biology","confidence":"High","confidence_rationale":"Tier 1-2 — chemical inhibition, immunodepletion, and mutagenesis identifying specific kinase and interaction residues","pmids":["15701524"],"is_preprint":false},{"year":2009,"finding":"p54nrb contributes to DNA double-strand break repair in vivo; siRNA-mediated p54nrb knockdown delays DSB repair (γ-H2AX focus assay), increases ionizing radiation-induced chromosomal aberrations, and increases radiosensitivity in clonogenic survival assays.","method":"siRNA knockdown, γ-H2AX focus assay, chromosomal aberration analysis, clonogenic survival assay","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal in vivo assays in human cells with clear phenotypic readouts","pmids":["19759212"],"is_preprint":false},{"year":2001,"finding":"PSF acts as a transcriptional corepressor through interaction with Sin3A; both PSF and NonO/p54nrb interact with the DNA-binding domains of nuclear hormone receptors (TR and RXR) and mediate silencing through HDAC recruitment to the receptor DBD.","method":"Biochemical purification from nuclear extracts, co-immunoprecipitation, reporter assays, HDAC inhibitor treatment","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2-3 — biochemical purification plus functional reporter assays; p54nrb/NonO role demonstrated alongside PSF","pmids":["11259580"],"is_preprint":false},{"year":2002,"finding":"p54nrb/NonO (identified as IPEB) functions as a transcriptional activator that binds DNA at the IAP proximal enhancer element; its N-terminal half contains the DNA-binding domain and C-terminal half contains the activation domain.","method":"Protein purification, cDNA cloning, reporter gene assays, domain deletion analysis","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 — functional domain mapping with reporter assays, single study","pmids":["9001221"],"is_preprint":false},{"year":2002,"finding":"p54nrb/NonO and PSF form a complex with SF-1 that binds the hCYP17 promoter; PSF represses basal transcription by interacting with mSin3A, while the SF-1/PSF/p54nrb/NonO complex mediates cAMP-induced transcriptional activation; PSF-p54nrb interaction with mSin3A recruits HDAC activity.","method":"EMSA, co-immunoprecipitation, reporter gene assays, HDAC inhibitor (trichostatin A) treatment","journal":"Endocrinology","confidence":"Medium","confidence_rationale":"Tier 2-3 — EMSA and co-IP plus functional reporter assays, single study","pmids":["11897684"],"is_preprint":false},{"year":1998,"finding":"The PSF/p54nrb complex directly interacts with DNA topoisomerase I; the complex stimulates topoisomerase I catalytic activity 16-fold, and PSF/p54nrb stimulates the ability of topoisomerase I to transfer ('jump') between separate DNA helices without affecting cleavage or religation half-reactions.","method":"Co-purification, co-immunoprecipitation, far Western blotting, in vitro topoisomerase activity assays, chemical crosslinking","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 — direct in vitro biochemical assay with reconstituted complex and mechanistic dissection","pmids":["9756848","10858305"],"is_preprint":false},{"year":2007,"finding":"p54nrb interacts with PSF in a complex that modulates the activity of SR protein SRSF2 on caspase-9 RNA splicing, decreasing SRSF2 binding to caspase-9 RNA and favoring expression of the antiapoptotic alternatively spliced form.","method":"Co-immunoprecipitation, RNA-binding assays, alternative splicing assays, siRNA knockdown","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2-3 — co-IP and functional splicing assay, single study","pmids":["32332923"],"is_preprint":false},{"year":2015,"finding":"CARM1 methylates the coiled-coil domain of p54nrb, resulting in reduced binding of p54nrb to mRNAs containing inverted repeated Alu elements (IRAlus), thus attenuating nuclear retention of these transcripts. CARM1 also suppresses NEAT1 transcription, reducing paraspeckle formation.","method":"CARM1 knockdown/knockout, RNA immunoprecipitation, methylation assays, mRNA nuclear/cytoplasmic fractionation","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 1-2 — direct PTM identified with functional consequence on RNA-protein interaction and mRNA export","pmids":["25792598"],"is_preprint":false},{"year":2018,"finding":"In mouse embryos, p54nrb and NEAT1 are required for CARM1 association with paraspeckles and for H3R26 methylation; depletion of p54nrb causes arrest at the 16- to 32-cell stage with elevated Cdx2 expression, indicating paraspeckles/p54nrb act upstream of CARM1 in early embryonic cell fate specification.","method":"Microinjection of siRNA into mouse embryos, immunofluorescence, embryonic developmental assays","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 — genetic epistasis (double knockdown) with defined developmental phenotype","pmids":["30550788"],"is_preprint":false},{"year":2006,"finding":"N-WASP forms a large nuclear complex with PSF-NonO (p54nrb), nuclear actin, and RNA polymerase II; interaction of N-WASP with PSF-NonO couples N-WASP to RNA pol II and regulates transcription; nuclear actin polymerization promoted by N-WASP is important in this process.","method":"Co-immunoprecipitation, nuclear fractionation, knockdown/overexpression with transcription readout","journal":"Nature cell biology","confidence":"Medium","confidence_rationale":"Tier 2-3 — co-IP with functional transcription assay, single study","pmids":["16767080"],"is_preprint":false},{"year":2006,"finding":"p54nrb is a component of the snRNP-free U1A (SF-A) complex; immunodepletion and reconstitution experiments show that p54nrb is critical for pre-mRNA cleavage during polyadenylation.","method":"TAP-tag purification, mass spectrometry, immunodepletion, reconstitution assays","journal":"RNA (New York, N.Y.)","confidence":"High","confidence_rationale":"Tier 1-2 — reconstitution after immunodepletion with functional polyadenylation readout","pmids":["16373496"],"is_preprint":false},{"year":2007,"finding":"p54nrb/NonO and three interacting proteins (hnRNP M, Ywhaz, Ppp1ca) bind to the rhodopsin distal enhancer region and augment rhodopsin expression; shRNA knockdown of NonO in mouse retina leads to loss of rhodopsin expression and rod cell death, with splicing defects in phototransduction genes.","method":"Mass spectrometry, ChIP-seq, shRNA knockdown, RNA-seq, rescue experiments","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 — ChIP-seq, RNA-seq, and in vivo knockdown with defined phenotype","pmids":["24301678"],"is_preprint":false},{"year":2009,"finding":"p54nrb functions as a transcriptional corepressor of the progesterone receptor (PR) independent of PSF; p54nrb directly interacts with PR, recruits mSin3A through its N-terminus to the PR-DNA complex, and inhibits PR-mediated transactivation. Knockdown of p54nrb alleviates PR-mediated repression of connexin 43 (Cx43/Gja1) transcription.","method":"Co-immunoprecipitation, reporter gene assays, siRNA knockdown, ChIP, overexpression","journal":"Molecular endocrinology (Baltimore, Md.)","confidence":"Medium","confidence_rationale":"Tier 2-3 — multiple functional assays with knockdown and ChIP, single study","pmids":["19423654"],"is_preprint":false},{"year":2003,"finding":"p54nrb interacts with the AF-1 (N-terminal A/B) domain of the androgen receptor (AR) in a ligand-dependent manner and potentiates AR AF-1 transcriptional activity; p54nrb was purified from HEK293 cells along with PSF, PSP1, and PSP2 as AR AF-1 region-interacting proteins.","method":"Biochemical purification, MALDI-TOF MS, co-immunoprecipitation, reporter gene assays","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2-3 — biochemical purification plus functional reporter assay, single study","pmids":["12810069"],"is_preprint":false},{"year":2007,"finding":"p54nrb and PSF synergistically form protein complexes with androgen receptor (AR) in a ligand-independent manner, interact directly with mSin3A, and inhibit AR transcriptional activity through HDAC recruitment; suppression is reversed by HDAC inhibition.","method":"Co-immunoprecipitation, reporter gene assays, HDAC inhibitor treatment, siRNA knockdown","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2-3 — co-IP and functional assay, single study","pmids":["17452459"],"is_preprint":false},{"year":2008,"finding":"p54nrb binds to the SWI/SNF complex components BRG1, Brm, and BAF60a through its N-terminal region; together with Brm, p54nrb regulates TERT gene transcription and alternative splicing of TERT exons. Brm and p54nrb co-localize at TERT exon 7 alternative splicing acceptor site.","method":"Pull-down assays, shRNA knockdown, RT-PCR for alternative splicing, ChIP, co-localization","journal":"The Biochemical journal","confidence":"Medium","confidence_rationale":"Tier 2-3 — pull-down and functional splicing assay with ChIP, single study","pmids":["18042045"],"is_preprint":false},{"year":2012,"finding":"YM155 induces disruption of the ILF3/p54nrb complex; p54nrb binds to the survivin promoter and regulates survivin expression; disruption of the ILF3/p54nrb complex by YM155 results in altered subcellular localization of ILF3 and p54nrb.","method":"Co-immunoprecipitation, promoter binding assays, small-molecule perturbation","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2-3 — co-IP and promoter binding with pharmacological perturbation, single study","pmids":["22842455"],"is_preprint":false},{"year":2015,"finding":"p54nrb/NONO interacts with the nuclear form of SREBP-1a through its conserved Y267 residue, increasing nuclear SREBP-1a protein stability and stimulating SREBP-1-mediated transcription of lipogenic genes and lipid production in breast cancer cells.","method":"Biochemical screen, co-immunoprecipitation, mutagenesis (Y267), reporter assays, siRNA knockdown, in vivo tumor model","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 2 — mutagenesis identifying critical residue, functional assays, and in vivo validation","pmids":["26148231"],"is_preprint":false},{"year":2013,"finding":"p54/NONO and PSF heterodimer bind the occludin enhancer element (OEE) in retinal endothelial cells; siRNA knockdown of p54 demonstrates it is necessary for glucocorticoid induction of occludin and claudin-5 expression and for pro-barrier effects.","method":"DNA affinity purification, MALDI-TOF MS/MS, ChIP, siRNA knockdown, permeability assays, TER measurement","journal":"Investigative ophthalmology & visual science","confidence":"Medium","confidence_rationale":"Tier 2 — DNA affinity purification, ChIP, and functional barrier assay, single study","pmids":["23640037"],"is_preprint":false},{"year":2020,"finding":"NONO (p54nrb) promotes oncogenic splicing switch of BIN1 from a short tumor-suppressor isoform to a long isoform (containing exon 12a) in hepatocellular carcinoma; NONO interacts with DHX9 and SFPQ to form a complex that promotes BIN1 exon 12a inclusion.","method":"RNA-seq, siRNA knockdown, co-immunoprecipitation, splicing assays","journal":"Hepatology (Baltimore, Md.)","confidence":"Medium","confidence_rationale":"Tier 2-3 — RNA-seq and co-IP with functional splicing phenotype, single study","pmids":["31815296"],"is_preprint":false},{"year":2019,"finding":"Toxic phosphorothioate ASOs form a complex including RNase H1, p54nrb, and PSF; p54nrb binds PS-ASOs via RRM1 and RRM2 domains, while RNase H1 binds via its hybrid-binding domain; RNase H1/p54nrb complexes form only in cells treated with toxic (not safe) PS-ASOs, and the p54nrb core domains are required for association with RNase H1.","method":"NanoLuciferase structural complementation reporter, live-cell imaging, in vitro binding assays, domain mutagenesis","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 — real-time live-cell reporter plus in vitro domain mapping, single study","pmids":["31495875"],"is_preprint":false},{"year":2010,"finding":"PSF (not its dimerization partner p54nrb/NONO) drives relocalization of PSF-containing complexes to sites of dense laser-induced DNA damage in living cells; sequences in PSF's N-terminal domain mediate both radioresistance and DNA damage site relocalization.","method":"miRNA-mediated knockdown, genetic rescue with mutant PSF constructs, real-time relocalization assay in live cells, laser-induced DNA damage","journal":"DNA repair","confidence":"Medium","confidence_rationale":"Tier 2 — live-cell imaging with mutational analysis distinguishing roles of PSF vs p54nrb, single study","pmids":["21144806"],"is_preprint":false},{"year":2016,"finding":"p54nrb transcriptionally regulates the lncRNA PCGEM1 by binding its promoter; p54nrb-induced PCGEM1 upregulates AR splice variant AR3, contributing to castration resistance. DIM (3,3'-diindolylmethane) suppresses PCGEM1 expression by preventing p54nrb from binding the PCGEM1 promoter.","method":"siRNA/CRISPR knockout, rescue experiments, ChIP, reporter assays, xenograft mouse model","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 — CRISPR KO with rescue and ChIP, functional in vivo xenograft model","pmids":["27682980"],"is_preprint":false},{"year":1996,"finding":"p54nrb was identified as a binding partner of the transcription factor Spi-1/PU.1; Spi-1/PU.1 impedes the binding of p54nrb to RNA and alters splicing in vitro, suggesting a mechanism for functional interference in erythropoiesis.","method":"Immobilized protein binding assay, microsequencing, in vitro RNA-binding competition, in vitro splicing assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2-3 — in vitro binding and splicing assays, single study","pmids":["8626664"],"is_preprint":false}],"current_model":"NONO (p54nrb) is a multifunctional nuclear RNA-binding protein that, as part of the DBHS-domain heterodimer with PSF (and sometimes PSPC1), operates at the interface of transcription, pre-mRNA splicing, 3'-end processing, transcription termination (via XRN2 recruitment), nuclear retention of hyperedited (inosine-containing) mRNAs within NEAT1-dependent paraspeckles, DNA double-strand break repair via NHEJ, and transcriptional co-regulation of nuclear receptors and other transcription factors through Sin3A/HDAC recruitment; its activities are regulated by mitotic Cdk1-dependent multi-site phosphorylation and by CARM1-mediated arginine methylation of its coiled-coil domain, which attenuates RNA binding and reduces paraspeckle-mediated mRNA retention."},"narrative":{"teleology":[{"year":1993,"claim":"Identification of p54nrb as a dual-RRM nuclear protein sharing the DBHS domain with PSF established it as a candidate RNA-processing factor.","evidence":"Protein purification from HeLa nuclear extract and cDNA cloning with sequence analysis","pmids":["8371983"],"confidence":"High","gaps":["No functional assay demonstrated; role in splicing was inferred from domain homology"]},{"year":1996,"claim":"Discovery that Spi-1/PU.1 competes with RNA for p54nrb binding and alters splicing in vitro provided the first evidence that p54nrb participates directly in pre-mRNA splicing.","evidence":"In vitro RNA-binding competition and splicing assays with purified proteins","pmids":["8626664"],"confidence":"Medium","gaps":["In vitro system only; no in vivo splicing targets identified","Single study without independent replication"]},{"year":1998,"claim":"Demonstration that the PSF–p54nrb heterodimer stimulates topoisomerase I catalytic activity and DNA strand transfer revealed that the complex has direct biochemical activity on DNA topology, beyond RNA processing.","evidence":"In vitro topoisomerase activity assays with reconstituted purified complex","pmids":["9756848","10858305"],"confidence":"High","gaps":["Physiological relevance of topoisomerase I stimulation not established in vivo"]},{"year":2001,"claim":"Two contemporaneous discoveries established that the NONO–PSF complex both retains hyperedited mRNAs in the nucleus and functions as a transcriptional corepressor via Sin3A/HDAC recruitment to nuclear receptors, revealing dual post-transcriptional and transcriptional roles.","evidence":"Nuclear extract fractionation with inosine-RNA binding and Xenopus oocyte retention assay; co-IP with Sin3A and HDAC inhibitor treatment with reporter assays","pmids":["11525732","11259580"],"confidence":"High","gaps":["Structural basis for selective recognition of inosine-containing RNA unknown","Whether corepressor function requires the PSF partner or is p54nrb-autonomous was unclear"]},{"year":2002,"claim":"Identification of NONO and PSF as paraspeckle components and as Pol II CTD-binding proteins that simultaneously engage RNA established the physical framework for cotranscriptional RNA processing.","evidence":"Live-cell imaging of paraspeckles; CTD affinity chromatography and co-IP with Pol II","pmids":["11790299","12358429","12403470"],"confidence":"High","gaps":["Paraspeckle function was unknown at this point","Whether CTD binding and snRNP association are simultaneous or sequential was not resolved"]},{"year":2004,"claim":"Reconstitution of NHEJ stimulation by the PSF–p54nrb–Ku complex and demonstration that NONO associates with 5′ splice sites on elongating Pol II complexes expanded the functional repertoire to DNA repair and cotranscriptional splicing.","evidence":"In vitro NHEJ reconstitution with purified proteins; immobilized DNA template assay with HeLa nuclear extracts","pmids":["15590677","15057275"],"confidence":"High","gaps":["In vivo DSB repair role not yet demonstrated","Whether NONO itself contacts DNA ends or acts as scaffold was unclear"]},{"year":2005,"claim":"Establishing that NONO is required for activator/CTD-stimulated splicing and 3′-end cleavage, and that its heterodimerization with PSP1 is needed for paraspeckle targeting, linked its molecular interactions to functional RNA-processing outcomes.","evidence":"Immunodepletion/reconstitution polyadenylation assays; domain mutagenesis with live-cell paraspeckle imaging","pmids":["16024807","16148043","15701524"],"confidence":"High","gaps":["NEAT1 dependence of paraspeckles not yet discovered","Cdk1 phosphorylation sites fully mapped but functional consequences during mitosis not characterized"]},{"year":2007,"claim":"Discovery that p54nrb recruits XRN2 for transcription termination and regulates alternative splicing of caspase-9 and ARE-containing mRNAs demonstrated its role in termination and post-transcriptional gene regulation.","evidence":"ChIP along transcribed genes, siRNA knockdown with termination readthrough; co-IP and alternative splicing assays","pmids":["17639083","32332923","17965020"],"confidence":"High","gaps":["Whether XRN2 recruitment is direct or via an RNA intermediate was not resolved","Specificity of ARE binding relative to PSF contribution unclear"]},{"year":2008,"claim":"In vivo evidence that NONO loss causes dwarfism in transgenic mice (via Sox9 target gene disruption) and interacts with SWI/SNF to regulate TERT splicing demonstrated physiological consequences of NONO dysfunction.","evidence":"Transgenic mouse model with RRM-deletion; shRNA knockdown with RT-PCR splicing analysis and ChIP","pmids":["18677406","18042045"],"confidence":"High","gaps":["Whether chondrocyte phenotype reflects splicing defects, transcriptional coactivation, or both was not separated"]},{"year":2009,"claim":"Identification of NEAT1 as the essential architectural RNA of paraspeckles, whose disruption releases NONO-retained hyperedited mRNAs, and demonstration that NONO loss impairs DSB repair in vivo, completed the picture of NONO's dual nuclear retention and DNA repair functions.","evidence":"NEAT1 knockdown with mRNA export assays; γ-H2AX focus assay, chromosomal aberration analysis, and clonogenic survival after IR","pmids":["19716791","19188602","19759212"],"confidence":"High","gaps":["Whether NONO contributes to HR in addition to NHEJ was unknown","Mechanism of NONO recruitment to DSBs was unclear — PSF drives relocalization, not NONO itself"]},{"year":2015,"claim":"Discovery that CARM1 methylates the NONO coiled-coil domain to attenuate RNA binding and reduce paraspeckle-mediated mRNA retention provided the first post-translational regulatory mechanism controlling NONO's RNA-retention function.","evidence":"CARM1 KO, methylation assays, RNA-IP, and nuclear/cytoplasmic fractionation","pmids":["25792598"],"confidence":"High","gaps":["Whether methylation affects other NONO functions (NHEJ, transcriptional coregulation) was not tested","Demethylase that reverses this mark unknown"]},{"year":2018,"claim":"Demonstration that NONO and NEAT1 are required for CARM1-dependent H3R26 methylation and inner-cell-mass specification in mouse embryos established a developmental role upstream of epigenetic programming.","evidence":"siRNA microinjection into mouse embryos with epistasis analysis and developmental assays","pmids":["30550788"],"confidence":"High","gaps":["Mechanism by which paraspeckle-localized NONO influences CARM1 histone methylation not fully defined","Whether NONO's RNA-retention versus transcriptional function is critical for this phenotype is unresolved"]},{"year":null,"claim":"Key unresolved questions include the structural basis by which the NONO–PSF heterodimer selectively recognizes inosine-containing versus unedited RNA, the full spectrum of NONO-dependent alternative splicing events in normal tissues, and how Cdk1-dependent mitotic phosphorylation functionally alters NONO activity during cell division.","evidence":"","pmids":[],"confidence":"Low","gaps":["No high-resolution structure of NONO–RNA complex with inosine substrate","Genome-wide map of NONO-dependent splicing events in primary tissues lacking","Functional consequences of mitotic phosphorylation on NONO's multiple activities untested"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[0,1,4,11,22,35]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[6,18,26,33]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[10,17,18,19,27,28,29,32,37]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[20,21,22]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[3,5,9]}],"localization":[{"term_id":"GO:0005654","term_label":"nucleoplasm","supporting_discovery_ids":[2,7,13,14]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,1,3,15]},{"term_id":"GO:0005730","term_label":"nucleolus","supporting_discovery_ids":[2]}],"pathway":[{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[4,5,8,9,21,25,30,34]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[3,10,17,18,19,26,27,28,29,32,37]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[6,16]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[12,23]}],"complexes":["DBHS heterodimer (NONO-SFPQ/PSF)","Paraspeckle (NONO-SFPQ-NEAT1)","snRNP-free U1A (SF-A) complex"],"partners":["SFPQ","PSPC1","MATR3","XRN2","NEAT1","TOP1","CARM1","SREBF1"],"other_free_text":[]},"mechanistic_narrative":"NONO (p54nrb) is a multifunctional nuclear RNA- and DNA-binding protein of the DBHS family that couples transcription by RNA polymerase II to pre-mRNA splicing, 3′-end cleavage, and transcription termination, while also participating in DNA double-strand break repair and transcriptional co-regulation. As an obligate heterodimer with PSF (SFPQ), NONO binds the RNA Pol II CTD and U5 snRNA/spliceosomal snRNPs to coordinate cotranscriptional RNA processing, recruits XRN2 for torpedo-model transcription termination, stimulates polyadenylation as a component of the snRNP-free U1A complex, and promotes NHEJ by cooperating with Ku to align DNA ends [PMID:12358429, PMID:17639083, PMID:16373496, PMID:15590677]. NONO is an essential structural component of NEAT1-dependent paraspeckles, where the NONO–PSF–matrin 3 complex selectively retains hyperedited inosine-containing mRNAs in the nucleus; CARM1-mediated methylation of the NONO coiled-coil domain attenuates this RNA binding and releases retained transcripts [PMID:11525732, PMID:19716791, PMID:25792598]. NONO also functions as a context-dependent transcriptional coactivator or corepressor for nuclear receptors (AR, PR, TR/RXR, SF-1) and other factors (Sox9, CREB/TORC2, SREBP-1a), recruiting Sin3A/HDAC complexes for repression or stabilizing activator complexes, with physiological consequences including regulation of chondrocyte differentiation, rod photoreceptor survival, lipogenesis, and early mouse embryonic cell-fate specification [PMID:11259580, PMID:18677406, PMID:24301678, PMID:26148231, PMID:30550788]."},"prefetch_data":{"uniprot":{"accession":"Q15233","full_name":"Non-POU domain-containing octamer-binding protein","aliases":["54 kDa nuclear RNA- and DNA-binding protein","p54(nrb)","p54nrb","55 kDa nuclear protein","NMT55","DNA-binding p52/p100 complex, 52 kDa subunit"],"length_aa":471,"mass_kda":54.2,"function":"DNA- and RNA binding protein, involved in several nuclear processes (PubMed:11525732, PubMed:12403470, PubMed:26571461). Binds the conventional octamer sequence in double-stranded DNA (PubMed:11525732, PubMed:12403470, PubMed:26571461). Also binds single-stranded DNA and RNA at a site independent of the duplex site (PubMed:11525732, PubMed:12403470, PubMed:26571461). Involved in pre-mRNA splicing, probably as a heterodimer with SFPQ (PubMed:11525732, PubMed:12403470, PubMed:26571461). Interacts with U5 snRNA, probably by binding to a purine-rich sequence located on the 3' side of U5 snRNA stem 1b (PubMed:12403470). Together with PSPC1, required for the formation of nuclear paraspeckles (PubMed:22416126). The SFPQ-NONO heteromer associated with MATR3 may play a role in nuclear retention of defective RNAs (PubMed:11525732). The SFPQ-NONO heteromer may be involved in DNA unwinding by modulating the function of topoisomerase I/TOP1 (PubMed:10858305). The SFPQ-NONO heteromer may be involved in DNA non-homologous end joining (NHEJ) required for double-strand break repair and V(D)J recombination and may stabilize paired DNA ends (PubMed:15590677). In vitro, the complex strongly stimulates DNA end joining, binds directly to the DNA substrates and cooperates with the Ku70/G22P1-Ku80/XRCC5 (Ku) dimer to establish a functional preligation complex (PubMed:15590677). NONO is involved in transcriptional regulation. The SFPQ-NONO-NR5A1 complex binds to the CYP17 promoter and regulates basal and cAMP-dependent transcriptional activity (PubMed:11897684). NONO binds to an enhancer element in long terminal repeats of endogenous intracisternal A particles (IAPs) and activates transcription (By similarity). Regulates the circadian clock by repressing the transcriptional activator activity of the CLOCK-BMAL1 heterodimer (By similarity). Important for the functional organization of GABAergic synapses (By similarity). Plays a specific and important role in the regulation of synaptic RNAs and GPHN/gephyrin scaffold structure, through the regulation of GABRA2 transcript (By similarity). Plays a key role during neuronal differentiation by recruiting TET1 to genomic loci and thereby regulating 5-hydroxymethylcytosine levels (By similarity). Plays a role in the regulation of DNA virus-mediated innate immune response by assembling into the HDP-RNP complex, a complex that serves as a platform for IRF3 phosphorylation and subsequent innate immune response activation through the cGAS-STING pathway (PubMed:28712728, PubMed:30270045). Promotes activation of the cGAS-STING pathway in response to HIV-2 infection: acts by interacting with HIV-2 Capsid protein p24, thereby promoting detection of viral DNA by CGAS, leading to CGAS-mediated inmmune activation (PubMed:30270045). In contrast, the weak interaction with HIV-1 Capsid protein p24 does not allow activation of the cGAS-STING pathway (PubMed:30270045)","subcellular_location":"Nucleus; Nucleus, nucleolus; Nucleus speckle; Chromosome","url":"https://www.uniprot.org/uniprotkb/Q15233/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/NONO","classification":"Not Classified","n_dependent_lines":175,"n_total_lines":1208,"dependency_fraction":0.14486754966887416},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000147140","cell_line_id":"CID001493","localizations":[{"compartment":"nucleoplasm","grade":3},{"compartment":"chromatin","grade":2},{"compartment":"nuclear_punctae","grade":2},{"compartment":"nucleolus_fc_dfc","grade":2}],"interactors":[{"gene":"SFPQ","stoichiometry":10.0},{"gene":"RBM7","stoichiometry":10.0},{"gene":"RPS10;RPS10-NUDT3","stoichiometry":4.0},{"gene":"RBM14","stoichiometry":4.0},{"gene":"CAPZB","stoichiometry":0.2},{"gene":"CLTA","stoichiometry":0.2},{"gene":"COPB2","stoichiometry":0.2},{"gene":"HNRNPH1","stoichiometry":0.2},{"gene":"ZNF768","stoichiometry":0.2},{"gene":"TET3","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/target/CID001493","total_profiled":1310},"omim":[{"mim_id":"619516","title":"BIFUNCTIONAL APOPTOSIS REGULATOR; BFAR","url":"https://www.omim.org/entry/619516"},{"mim_id":"615968","title":"MYCN UPSTREAM TRANSCRIPT, NONCODING; MYCNUT","url":"https://www.omim.org/entry/615968"},{"mim_id":"613901","title":"RNA 2-PRIME,3-PRIME CYCLIC PHOSPHATE AND 5-PRIME-OH LIGASE; RTCB","url":"https://www.omim.org/entry/613901"},{"mim_id":"612769","title":"NONCODING NUCLEAR-ENRICHED ABUNDANT TRANSCRIPT 1; NEAT1","url":"https://www.omim.org/entry/612769"},{"mim_id":"612482","title":"RING FINGER PROTEIN 43; RNF43","url":"https://www.omim.org/entry/612482"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Enhanced","locations":[{"location":"Nucleoplasm","reliability":"Enhanced"},{"location":"Nucleoli","reliability":"Additional"},{"location":"Nucleoli fibrillar center","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/NONO"},"hgnc":{"alias_symbol":["p54(NRB)","NRB54","NMT55","P54NRB","P54","PPP1R114"],"prev_symbol":[]},"alphafold":{"accession":"Q15233","domains":[{"cath_id":"3.30.70.330","chopping":"71-142","consensus_level":"high","plddt":93.4621,"start":71,"end":142},{"cath_id":"3.30.70.330","chopping":"148-225","consensus_level":"high","plddt":96.3383,"start":148,"end":225},{"cath_id":"1.20.5","chopping":"261-362","consensus_level":"medium","plddt":92.6302,"start":261,"end":362}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q15233","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q15233-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q15233-F1-predicted_aligned_error_v6.png","plddt_mean":76.75},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=NONO","jax_strain_url":"https://www.jax.org/strain/search?query=NONO"},"sequence":{"accession":"Q15233","fasta_url":"https://rest.uniprot.org/uniprotkb/Q15233.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q15233/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q15233"}},"corpus_meta":[{"pmid":"19716791","id":"PMC_19716791","title":"Altered 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The protein was identified by cross-reactivity with antibodies against yeast splicing factor PRP18.\",\n      \"method\": \"Protein purification, cDNA cloning, sequence analysis\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — original biochemical purification and molecular cloning with domain characterization\",\n      \"pmids\": [\"8371983\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"p54nrb forms a multiprotein complex with PSF and matrin 3 that binds specifically and cooperatively to inosine-containing (hyperedited) RNAs and anchors them to the nuclear matrix, thereby retaining promiscuously A-to-I edited RNAs in the nucleus and preventing their export.\",\n      \"method\": \"HeLa cell nuclear extract fractionation, affinity purification, RNA-binding assays, Xenopus oocyte retention assay\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstituted complex from nuclear extracts with functional RNA retention assay in oocyte model\",\n      \"pmids\": [\"11525732\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"p54nrb/NonO and PSF are components of paraspeckles, a novel subnuclear compartment in the interchromatin nucleoplasmic space; both proteins interact dynamically with nucleoli in a transcription-dependent manner and relocalize to nucleolar cap structures upon transcription inhibition.\",\n      \"method\": \"Immunofluorescence, live-cell imaging with YFP-PSP1 stable cell line, transcription inhibition experiments\",\n      \"journal\": \"Current biology : CB\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct live-cell imaging and fractionation with functional consequence (transcription-dependent relocalization)\",\n      \"pmids\": [\"11790299\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"PSF and p54nrb/NonO bind specifically to the CTD of RNA polymerase II (both hypo- and hyperphosphorylated forms), co-purify with a pol II holoenzyme, and can interact with the CTD and RNA simultaneously, providing a physical link between pol II and pre-mRNA processing.\",\n      \"method\": \"Affinity chromatography on immobilized CTD matrices, co-immunoprecipitation with pol II antibodies, RNA-binding assays\",\n      \"journal\": \"RNA (New York, N.Y.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — reciprocal co-IP and affinity chromatography with multiple orthogonal methods\",\n      \"pmids\": [\"12358429\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"PSF and p54nrb bind U5 snRNA at stem 1b in a sequence- and structure-dependent manner; both proteins associate with spliceosomes and with U4/U6.U5 tri-snRNP.\",\n      \"method\": \"SELEX/iterative selection, filter-binding assays, RNA affinity selection, sedimentation analysis\",\n      \"journal\": \"RNA (New York, N.Y.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro biochemical assays with multiple methods defining RNA-binding specificity\",\n      \"pmids\": [\"12403470\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"p54nrb associates with the 5' splice site within large complexes containing hyperphosphorylated RNA pol II (RNAPIIO) and U1/U2 snRNPs; p54nrb and PSF can interact directly with the 5' splice site, indicating they mediate contacts between RNAPII and snRNPs during coupled transcription/splicing.\",\n      \"method\": \"HeLa nuclear extract pull-down, immobilized DNA template assay, co-immunoprecipitation\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — reconstituted functional elongation complexes with immobilized template assay and direct binding evidence\",\n      \"pmids\": [\"15057275\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"The PSF·p54nrb heterodimeric complex stimulates DNA double-strand break rejoining in vitro by cooperating with Ku protein to form a preligation complex with substrate DNA; the four RRM domains in the heterodimer are proposed to align separate DNA molecules.\",\n      \"method\": \"In vitro NHEJ reconstitution assay with purified proteins, DNA-binding studies\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstituted in vitro NHEJ system with purified complex\",\n      \"pmids\": [\"15590677\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"p54nrb forms a heterodimer with PSP1 in vivo; the interaction domain in PSP1 is required for its correct localization to paraspeckles, and an RNA-binding-competent RRM is also required for paraspeckle targeting. Paraspeckle formation depends on ongoing RNA Pol II transcription.\",\n      \"method\": \"Co-immunoprecipitation, domain mapping, DRB transcription inhibition, live-cell imaging\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods including co-IP, domain mutagenesis, and live imaging with functional consequence\",\n      \"pmids\": [\"16148043\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"PSF and p54nrb preferentially bind strong transcriptional activation domains and are required for activator- and CTD-mediated stimulation of pre-mRNA splicing and 3'-end cleavage; PSF overexpression bypasses the requirement for a strong activator.\",\n      \"method\": \"Affinity chromatography, overexpression in 293 cells, CTD truncation experiments, splicing assays\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods including in vivo functional rescue and in vitro binding\",\n      \"pmids\": [\"16024807\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"p54nrb/NonO (p54) physically associates with XRN2 and is required for degradation of 3'-cleaved RNA in vitro; p54 is present along the length of transcribed genes and its siRNA-mediated knockdown leads to defects in XRN2 recruitment and transcription termination.\",\n      \"method\": \"Co-immunoprecipitation, in vitro 3'-processing assays, ChIP, siRNA knockdown\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro processing assay combined with ChIP and knockdown phenotype\",\n      \"pmids\": [\"17639083\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"NONO/p54nrb was identified as a TORC2-interacting protein in the cAMP signaling pathway; NONO is necessary for cAMP-dependent activation of CREB target genes and acts as a bridge between the CREB/TORC complex and RNA polymerase II.\",\n      \"method\": \"High-throughput coactivator trap screen, RNAi knockdown, ChIP\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — functional genomic screen plus RNAi and ChIP, single study\",\n      \"pmids\": [\"18077367\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"PSF and p54nrb bind AU-rich element (ARE)-containing RNAs including TNFα mRNA; Mnk kinases phosphorylate PSF at two sites, and Mnk-mediated phosphorylation increases PSF binding to TNFα mRNA in living cells.\",\n      \"method\": \"Proteomic substrate screen, in vitro kinase assays, in vivo phosphorylation, RNA immunoprecipitation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vitro kinase assay plus in vivo phosphorylation and RNA-IP, single study\",\n      \"pmids\": [\"17965020\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"p54nrb physically interacts with Sox9 transcription factor, enhances Sox9-dependent transcriptional activation of the Col2a1 promoter, and is required for maturation of Sox9-target gene mRNA. Loss of p54nrb RNA recognition motifs disrupts paraspeckle bodies, inhibits chondrocyte differentiation, and causes dwarfism in transgenic mice.\",\n      \"method\": \"Co-immunoprecipitation, reporter assays, siRNA knockdown, transgenic mouse model\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple methods including co-IP, knockdown, and in vivo transgenic mouse phenotype\",\n      \"pmids\": [\"18677406\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Paraspeckle assembly and function depend on the long noncoding RNA NEAT1; NEAT1 is absent in hESCs and induced upon differentiation, coinciding with paraspeckle formation. Knockdown of NEAT1 in HeLa cells abolishes paraspeckles and enhances nucleocytoplasmic export of mRNAs containing inverted Alu repeats that are normally retained in paraspeckle-associated complexes containing p54nrb.\",\n      \"method\": \"NEAT1 knockdown, siRNA, mRNA export assays, immunofluorescence\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — knockdown with functional mRNA export readout, replicated across systems\",\n      \"pmids\": [\"19716791\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"MENβ (NEAT1_2) is stabilized by selective association with p54nrb and PSF, which is required for paraspeckle structural integrity; knockdown of MENβ leads to paraspeckle disintegration and prevents reassembly after transcriptional arrest.\",\n      \"method\": \"RNAi knockdown, immunoprecipitation, transcriptional arrest/recovery assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — RNAi with structural phenotype and reciprocal IP, replicated with multiple methods\",\n      \"pmids\": [\"19188602\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"p54nrb is phosphorylated during mitosis at its carboxy-terminal extremity by Cdk1 and at amino-terminal sites by a distinct kinase; p54nrb interacts with the peptidylprolyl isomerase Pin1 through three phosphorylated threonine residues in its proline-rich C-terminus, suggesting regulation by phosphorylation-dependent conformational changes upon mitotic entry.\",\n      \"method\": \"Mitosis-specific phospho-antibodies (CC-3, MPM-2), CDK inhibitor (roscovitine), immunodepletion of cyclin B1, site-directed mutagenesis, Pin1 interaction assays\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — chemical inhibition, immunodepletion, and mutagenesis identifying specific kinase and interaction residues\",\n      \"pmids\": [\"15701524\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"p54nrb contributes to DNA double-strand break repair in vivo; siRNA-mediated p54nrb knockdown delays DSB repair (γ-H2AX focus assay), increases ionizing radiation-induced chromosomal aberrations, and increases radiosensitivity in clonogenic survival assays.\",\n      \"method\": \"siRNA knockdown, γ-H2AX focus assay, chromosomal aberration analysis, clonogenic survival assay\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal in vivo assays in human cells with clear phenotypic readouts\",\n      \"pmids\": [\"19759212\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"PSF acts as a transcriptional corepressor through interaction with Sin3A; both PSF and NonO/p54nrb interact with the DNA-binding domains of nuclear hormone receptors (TR and RXR) and mediate silencing through HDAC recruitment to the receptor DBD.\",\n      \"method\": \"Biochemical purification from nuclear extracts, co-immunoprecipitation, reporter assays, HDAC inhibitor treatment\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — biochemical purification plus functional reporter assays; p54nrb/NonO role demonstrated alongside PSF\",\n      \"pmids\": [\"11259580\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"p54nrb/NonO (identified as IPEB) functions as a transcriptional activator that binds DNA at the IAP proximal enhancer element; its N-terminal half contains the DNA-binding domain and C-terminal half contains the activation domain.\",\n      \"method\": \"Protein purification, cDNA cloning, reporter gene assays, domain deletion analysis\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional domain mapping with reporter assays, single study\",\n      \"pmids\": [\"9001221\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"p54nrb/NonO and PSF form a complex with SF-1 that binds the hCYP17 promoter; PSF represses basal transcription by interacting with mSin3A, while the SF-1/PSF/p54nrb/NonO complex mediates cAMP-induced transcriptional activation; PSF-p54nrb interaction with mSin3A recruits HDAC activity.\",\n      \"method\": \"EMSA, co-immunoprecipitation, reporter gene assays, HDAC inhibitor (trichostatin A) treatment\",\n      \"journal\": \"Endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — EMSA and co-IP plus functional reporter assays, single study\",\n      \"pmids\": [\"11897684\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"The PSF/p54nrb complex directly interacts with DNA topoisomerase I; the complex stimulates topoisomerase I catalytic activity 16-fold, and PSF/p54nrb stimulates the ability of topoisomerase I to transfer ('jump') between separate DNA helices without affecting cleavage or religation half-reactions.\",\n      \"method\": \"Co-purification, co-immunoprecipitation, far Western blotting, in vitro topoisomerase activity assays, chemical crosslinking\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct in vitro biochemical assay with reconstituted complex and mechanistic dissection\",\n      \"pmids\": [\"9756848\", \"10858305\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"p54nrb interacts with PSF in a complex that modulates the activity of SR protein SRSF2 on caspase-9 RNA splicing, decreasing SRSF2 binding to caspase-9 RNA and favoring expression of the antiapoptotic alternatively spliced form.\",\n      \"method\": \"Co-immunoprecipitation, RNA-binding assays, alternative splicing assays, siRNA knockdown\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — co-IP and functional splicing assay, single study\",\n      \"pmids\": [\"32332923\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"CARM1 methylates the coiled-coil domain of p54nrb, resulting in reduced binding of p54nrb to mRNAs containing inverted repeated Alu elements (IRAlus), thus attenuating nuclear retention of these transcripts. CARM1 also suppresses NEAT1 transcription, reducing paraspeckle formation.\",\n      \"method\": \"CARM1 knockdown/knockout, RNA immunoprecipitation, methylation assays, mRNA nuclear/cytoplasmic fractionation\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct PTM identified with functional consequence on RNA-protein interaction and mRNA export\",\n      \"pmids\": [\"25792598\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"In mouse embryos, p54nrb and NEAT1 are required for CARM1 association with paraspeckles and for H3R26 methylation; depletion of p54nrb causes arrest at the 16- to 32-cell stage with elevated Cdx2 expression, indicating paraspeckles/p54nrb act upstream of CARM1 in early embryonic cell fate specification.\",\n      \"method\": \"Microinjection of siRNA into mouse embryos, immunofluorescence, embryonic developmental assays\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis (double knockdown) with defined developmental phenotype\",\n      \"pmids\": [\"30550788\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"N-WASP forms a large nuclear complex with PSF-NonO (p54nrb), nuclear actin, and RNA polymerase II; interaction of N-WASP with PSF-NonO couples N-WASP to RNA pol II and regulates transcription; nuclear actin polymerization promoted by N-WASP is important in this process.\",\n      \"method\": \"Co-immunoprecipitation, nuclear fractionation, knockdown/overexpression with transcription readout\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — co-IP with functional transcription assay, single study\",\n      \"pmids\": [\"16767080\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"p54nrb is a component of the snRNP-free U1A (SF-A) complex; immunodepletion and reconstitution experiments show that p54nrb is critical for pre-mRNA cleavage during polyadenylation.\",\n      \"method\": \"TAP-tag purification, mass spectrometry, immunodepletion, reconstitution assays\",\n      \"journal\": \"RNA (New York, N.Y.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — reconstitution after immunodepletion with functional polyadenylation readout\",\n      \"pmids\": [\"16373496\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"p54nrb/NonO and three interacting proteins (hnRNP M, Ywhaz, Ppp1ca) bind to the rhodopsin distal enhancer region and augment rhodopsin expression; shRNA knockdown of NonO in mouse retina leads to loss of rhodopsin expression and rod cell death, with splicing defects in phototransduction genes.\",\n      \"method\": \"Mass spectrometry, ChIP-seq, shRNA knockdown, RNA-seq, rescue experiments\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — ChIP-seq, RNA-seq, and in vivo knockdown with defined phenotype\",\n      \"pmids\": [\"24301678\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"p54nrb functions as a transcriptional corepressor of the progesterone receptor (PR) independent of PSF; p54nrb directly interacts with PR, recruits mSin3A through its N-terminus to the PR-DNA complex, and inhibits PR-mediated transactivation. Knockdown of p54nrb alleviates PR-mediated repression of connexin 43 (Cx43/Gja1) transcription.\",\n      \"method\": \"Co-immunoprecipitation, reporter gene assays, siRNA knockdown, ChIP, overexpression\",\n      \"journal\": \"Molecular endocrinology (Baltimore, Md.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — multiple functional assays with knockdown and ChIP, single study\",\n      \"pmids\": [\"19423654\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"p54nrb interacts with the AF-1 (N-terminal A/B) domain of the androgen receptor (AR) in a ligand-dependent manner and potentiates AR AF-1 transcriptional activity; p54nrb was purified from HEK293 cells along with PSF, PSP1, and PSP2 as AR AF-1 region-interacting proteins.\",\n      \"method\": \"Biochemical purification, MALDI-TOF MS, co-immunoprecipitation, reporter gene assays\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — biochemical purification plus functional reporter assay, single study\",\n      \"pmids\": [\"12810069\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"p54nrb and PSF synergistically form protein complexes with androgen receptor (AR) in a ligand-independent manner, interact directly with mSin3A, and inhibit AR transcriptional activity through HDAC recruitment; suppression is reversed by HDAC inhibition.\",\n      \"method\": \"Co-immunoprecipitation, reporter gene assays, HDAC inhibitor treatment, siRNA knockdown\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — co-IP and functional assay, single study\",\n      \"pmids\": [\"17452459\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"p54nrb binds to the SWI/SNF complex components BRG1, Brm, and BAF60a through its N-terminal region; together with Brm, p54nrb regulates TERT gene transcription and alternative splicing of TERT exons. Brm and p54nrb co-localize at TERT exon 7 alternative splicing acceptor site.\",\n      \"method\": \"Pull-down assays, shRNA knockdown, RT-PCR for alternative splicing, ChIP, co-localization\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — pull-down and functional splicing assay with ChIP, single study\",\n      \"pmids\": [\"18042045\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"YM155 induces disruption of the ILF3/p54nrb complex; p54nrb binds to the survivin promoter and regulates survivin expression; disruption of the ILF3/p54nrb complex by YM155 results in altered subcellular localization of ILF3 and p54nrb.\",\n      \"method\": \"Co-immunoprecipitation, promoter binding assays, small-molecule perturbation\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — co-IP and promoter binding with pharmacological perturbation, single study\",\n      \"pmids\": [\"22842455\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"p54nrb/NONO interacts with the nuclear form of SREBP-1a through its conserved Y267 residue, increasing nuclear SREBP-1a protein stability and stimulating SREBP-1-mediated transcription of lipogenic genes and lipid production in breast cancer cells.\",\n      \"method\": \"Biochemical screen, co-immunoprecipitation, mutagenesis (Y267), reporter assays, siRNA knockdown, in vivo tumor model\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — mutagenesis identifying critical residue, functional assays, and in vivo validation\",\n      \"pmids\": [\"26148231\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"p54/NONO and PSF heterodimer bind the occludin enhancer element (OEE) in retinal endothelial cells; siRNA knockdown of p54 demonstrates it is necessary for glucocorticoid induction of occludin and claudin-5 expression and for pro-barrier effects.\",\n      \"method\": \"DNA affinity purification, MALDI-TOF MS/MS, ChIP, siRNA knockdown, permeability assays, TER measurement\",\n      \"journal\": \"Investigative ophthalmology & visual science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — DNA affinity purification, ChIP, and functional barrier assay, single study\",\n      \"pmids\": [\"23640037\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"NONO (p54nrb) promotes oncogenic splicing switch of BIN1 from a short tumor-suppressor isoform to a long isoform (containing exon 12a) in hepatocellular carcinoma; NONO interacts with DHX9 and SFPQ to form a complex that promotes BIN1 exon 12a inclusion.\",\n      \"method\": \"RNA-seq, siRNA knockdown, co-immunoprecipitation, splicing assays\",\n      \"journal\": \"Hepatology (Baltimore, Md.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — RNA-seq and co-IP with functional splicing phenotype, single study\",\n      \"pmids\": [\"31815296\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Toxic phosphorothioate ASOs form a complex including RNase H1, p54nrb, and PSF; p54nrb binds PS-ASOs via RRM1 and RRM2 domains, while RNase H1 binds via its hybrid-binding domain; RNase H1/p54nrb complexes form only in cells treated with toxic (not safe) PS-ASOs, and the p54nrb core domains are required for association with RNase H1.\",\n      \"method\": \"NanoLuciferase structural complementation reporter, live-cell imaging, in vitro binding assays, domain mutagenesis\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — real-time live-cell reporter plus in vitro domain mapping, single study\",\n      \"pmids\": [\"31495875\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"PSF (not its dimerization partner p54nrb/NONO) drives relocalization of PSF-containing complexes to sites of dense laser-induced DNA damage in living cells; sequences in PSF's N-terminal domain mediate both radioresistance and DNA damage site relocalization.\",\n      \"method\": \"miRNA-mediated knockdown, genetic rescue with mutant PSF constructs, real-time relocalization assay in live cells, laser-induced DNA damage\",\n      \"journal\": \"DNA repair\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — live-cell imaging with mutational analysis distinguishing roles of PSF vs p54nrb, single study\",\n      \"pmids\": [\"21144806\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"p54nrb transcriptionally regulates the lncRNA PCGEM1 by binding its promoter; p54nrb-induced PCGEM1 upregulates AR splice variant AR3, contributing to castration resistance. DIM (3,3'-diindolylmethane) suppresses PCGEM1 expression by preventing p54nrb from binding the PCGEM1 promoter.\",\n      \"method\": \"siRNA/CRISPR knockout, rescue experiments, ChIP, reporter assays, xenograft mouse model\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — CRISPR KO with rescue and ChIP, functional in vivo xenograft model\",\n      \"pmids\": [\"27682980\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"p54nrb was identified as a binding partner of the transcription factor Spi-1/PU.1; Spi-1/PU.1 impedes the binding of p54nrb to RNA and alters splicing in vitro, suggesting a mechanism for functional interference in erythropoiesis.\",\n      \"method\": \"Immobilized protein binding assay, microsequencing, in vitro RNA-binding competition, in vitro splicing assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — in vitro binding and splicing assays, single study\",\n      \"pmids\": [\"8626664\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"NONO (p54nrb) is a multifunctional nuclear RNA-binding protein that, as part of the DBHS-domain heterodimer with PSF (and sometimes PSPC1), operates at the interface of transcription, pre-mRNA splicing, 3'-end processing, transcription termination (via XRN2 recruitment), nuclear retention of hyperedited (inosine-containing) mRNAs within NEAT1-dependent paraspeckles, DNA double-strand break repair via NHEJ, and transcriptional co-regulation of nuclear receptors and other transcription factors through Sin3A/HDAC recruitment; its activities are regulated by mitotic Cdk1-dependent multi-site phosphorylation and by CARM1-mediated arginine methylation of its coiled-coil domain, which attenuates RNA binding and reduces paraspeckle-mediated mRNA retention.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"NONO (p54nrb) is a multifunctional nuclear RNA- and DNA-binding protein of the DBHS family that couples transcription by RNA polymerase II to pre-mRNA splicing, 3′-end cleavage, and transcription termination, while also participating in DNA double-strand break repair and transcriptional co-regulation. As an obligate heterodimer with PSF (SFPQ), NONO binds the RNA Pol II CTD and U5 snRNA/spliceosomal snRNPs to coordinate cotranscriptional RNA processing, recruits XRN2 for torpedo-model transcription termination, stimulates polyadenylation as a component of the snRNP-free U1A complex, and promotes NHEJ by cooperating with Ku to align DNA ends [PMID:12358429, PMID:17639083, PMID:16373496, PMID:15590677]. NONO is an essential structural component of NEAT1-dependent paraspeckles, where the NONO–PSF–matrin 3 complex selectively retains hyperedited inosine-containing mRNAs in the nucleus; CARM1-mediated methylation of the NONO coiled-coil domain attenuates this RNA binding and releases retained transcripts [PMID:11525732, PMID:19716791, PMID:25792598]. NONO also functions as a context-dependent transcriptional coactivator or corepressor for nuclear receptors (AR, PR, TR/RXR, SF-1) and other factors (Sox9, CREB/TORC2, SREBP-1a), recruiting Sin3A/HDAC complexes for repression or stabilizing activator complexes, with physiological consequences including regulation of chondrocyte differentiation, rod photoreceptor survival, lipogenesis, and early mouse embryonic cell-fate specification [PMID:11259580, PMID:18677406, PMID:24301678, PMID:26148231, PMID:30550788].\",\n  \"teleology\": [\n    {\n      \"year\": 1993,\n      \"claim\": \"Identification of p54nrb as a dual-RRM nuclear protein sharing the DBHS domain with PSF established it as a candidate RNA-processing factor.\",\n      \"evidence\": \"Protein purification from HeLa nuclear extract and cDNA cloning with sequence analysis\",\n      \"pmids\": [\"8371983\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No functional assay demonstrated; role in splicing was inferred from domain homology\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Discovery that Spi-1/PU.1 competes with RNA for p54nrb binding and alters splicing in vitro provided the first evidence that p54nrb participates directly in pre-mRNA splicing.\",\n      \"evidence\": \"In vitro RNA-binding competition and splicing assays with purified proteins\",\n      \"pmids\": [\"8626664\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vitro system only; no in vivo splicing targets identified\", \"Single study without independent replication\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Demonstration that the PSF–p54nrb heterodimer stimulates topoisomerase I catalytic activity and DNA strand transfer revealed that the complex has direct biochemical activity on DNA topology, beyond RNA processing.\",\n      \"evidence\": \"In vitro topoisomerase activity assays with reconstituted purified complex\",\n      \"pmids\": [\"9756848\", \"10858305\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological relevance of topoisomerase I stimulation not established in vivo\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Two contemporaneous discoveries established that the NONO–PSF complex both retains hyperedited mRNAs in the nucleus and functions as a transcriptional corepressor via Sin3A/HDAC recruitment to nuclear receptors, revealing dual post-transcriptional and transcriptional roles.\",\n      \"evidence\": \"Nuclear extract fractionation with inosine-RNA binding and Xenopus oocyte retention assay; co-IP with Sin3A and HDAC inhibitor treatment with reporter assays\",\n      \"pmids\": [\"11525732\", \"11259580\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis for selective recognition of inosine-containing RNA unknown\", \"Whether corepressor function requires the PSF partner or is p54nrb-autonomous was unclear\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Identification of NONO and PSF as paraspeckle components and as Pol II CTD-binding proteins that simultaneously engage RNA established the physical framework for cotranscriptional RNA processing.\",\n      \"evidence\": \"Live-cell imaging of paraspeckles; CTD affinity chromatography and co-IP with Pol II\",\n      \"pmids\": [\"11790299\", \"12358429\", \"12403470\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Paraspeckle function was unknown at this point\", \"Whether CTD binding and snRNP association are simultaneous or sequential was not resolved\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Reconstitution of NHEJ stimulation by the PSF–p54nrb–Ku complex and demonstration that NONO associates with 5′ splice sites on elongating Pol II complexes expanded the functional repertoire to DNA repair and cotranscriptional splicing.\",\n      \"evidence\": \"In vitro NHEJ reconstitution with purified proteins; immobilized DNA template assay with HeLa nuclear extracts\",\n      \"pmids\": [\"15590677\", \"15057275\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo DSB repair role not yet demonstrated\", \"Whether NONO itself contacts DNA ends or acts as scaffold was unclear\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Establishing that NONO is required for activator/CTD-stimulated splicing and 3′-end cleavage, and that its heterodimerization with PSP1 is needed for paraspeckle targeting, linked its molecular interactions to functional RNA-processing outcomes.\",\n      \"evidence\": \"Immunodepletion/reconstitution polyadenylation assays; domain mutagenesis with live-cell paraspeckle imaging\",\n      \"pmids\": [\"16024807\", \"16148043\", \"15701524\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"NEAT1 dependence of paraspeckles not yet discovered\", \"Cdk1 phosphorylation sites fully mapped but functional consequences during mitosis not characterized\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Discovery that p54nrb recruits XRN2 for transcription termination and regulates alternative splicing of caspase-9 and ARE-containing mRNAs demonstrated its role in termination and post-transcriptional gene regulation.\",\n      \"evidence\": \"ChIP along transcribed genes, siRNA knockdown with termination readthrough; co-IP and alternative splicing assays\",\n      \"pmids\": [\"17639083\", \"32332923\", \"17965020\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether XRN2 recruitment is direct or via an RNA intermediate was not resolved\", \"Specificity of ARE binding relative to PSF contribution unclear\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"In vivo evidence that NONO loss causes dwarfism in transgenic mice (via Sox9 target gene disruption) and interacts with SWI/SNF to regulate TERT splicing demonstrated physiological consequences of NONO dysfunction.\",\n      \"evidence\": \"Transgenic mouse model with RRM-deletion; shRNA knockdown with RT-PCR splicing analysis and ChIP\",\n      \"pmids\": [\"18677406\", \"18042045\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether chondrocyte phenotype reflects splicing defects, transcriptional coactivation, or both was not separated\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Identification of NEAT1 as the essential architectural RNA of paraspeckles, whose disruption releases NONO-retained hyperedited mRNAs, and demonstration that NONO loss impairs DSB repair in vivo, completed the picture of NONO's dual nuclear retention and DNA repair functions.\",\n      \"evidence\": \"NEAT1 knockdown with mRNA export assays; γ-H2AX focus assay, chromosomal aberration analysis, and clonogenic survival after IR\",\n      \"pmids\": [\"19716791\", \"19188602\", \"19759212\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether NONO contributes to HR in addition to NHEJ was unknown\", \"Mechanism of NONO recruitment to DSBs was unclear — PSF drives relocalization, not NONO itself\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Discovery that CARM1 methylates the NONO coiled-coil domain to attenuate RNA binding and reduce paraspeckle-mediated mRNA retention provided the first post-translational regulatory mechanism controlling NONO's RNA-retention function.\",\n      \"evidence\": \"CARM1 KO, methylation assays, RNA-IP, and nuclear/cytoplasmic fractionation\",\n      \"pmids\": [\"25792598\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether methylation affects other NONO functions (NHEJ, transcriptional coregulation) was not tested\", \"Demethylase that reverses this mark unknown\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Demonstration that NONO and NEAT1 are required for CARM1-dependent H3R26 methylation and inner-cell-mass specification in mouse embryos established a developmental role upstream of epigenetic programming.\",\n      \"evidence\": \"siRNA microinjection into mouse embryos with epistasis analysis and developmental assays\",\n      \"pmids\": [\"30550788\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which paraspeckle-localized NONO influences CARM1 histone methylation not fully defined\", \"Whether NONO's RNA-retention versus transcriptional function is critical for this phenotype is unresolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the structural basis by which the NONO–PSF heterodimer selectively recognizes inosine-containing versus unedited RNA, the full spectrum of NONO-dependent alternative splicing events in normal tissues, and how Cdk1-dependent mitotic phosphorylation functionally alters NONO activity during cell division.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No high-resolution structure of NONO–RNA complex with inosine substrate\", \"Genome-wide map of NONO-dependent splicing events in primary tissues lacking\", \"Functional consequences of mitotic phosphorylation on NONO's multiple activities untested\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [0, 1, 4, 11, 22, 35]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [6, 18, 26, 33]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [10, 17, 18, 19, 27, 28, 29, 32, 37]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [20, 21, 22]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [3, 5, 9]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005654\", \"supporting_discovery_ids\": [2, 7, 13, 14]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 1, 3, 15]},\n      {\"term_id\": \"GO:0005730\", \"supporting_discovery_ids\": [2]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [4, 5, 8, 9, 21, 25, 30, 34]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [3, 10, 17, 18, 19, 26, 27, 28, 29, 32, 37]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [6, 16]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [12, 23]}\n    ],\n    \"complexes\": [\n      \"DBHS heterodimer (NONO-SFPQ/PSF)\",\n      \"Paraspeckle (NONO-SFPQ-NEAT1)\",\n      \"snRNP-free U1A (SF-A) complex\"\n    ],\n    \"partners\": [\n      \"SFPQ\",\n      \"PSPC1\",\n      \"MATR3\",\n      \"XRN2\",\n      \"NEAT1\",\n      \"TOP1\",\n      \"CARM1\",\n      \"SREBF1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}