{"gene":"NONO","run_date":"2026-06-10T05:19:52","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, and both p54nrb and PSF define a novel conserved protein segment termed the DBHS domain (Drosophila behavior, human splicing), suggesting involvement in pre-mRNA splicing regulation.","method":"Protein purification, cDNA cloning, sequence analysis","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct protein purification and cloning with sequence-based functional inference; single lab but foundational characterization","pmids":["8371983"],"is_preprint":false},{"year":1996,"finding":"p54nrb was identified as a binding partner of the transcription factor Spi-1/PU.1 via an immobilized protein binding assay. Spi-1/PU.1 impedes the binding of p54nrb to RNA and alters the splicing process in vitro.","method":"Immobilized protein binding assay, in vitro splicing assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct biochemical binding assay plus functional in vitro splicing assay; single lab","pmids":["8626664"],"is_preprint":false},{"year":1997,"finding":"p54nrb (NonO) was found fused to the TFE3 helix-loop-helix transcription factor gene in papillary renal cell carcinoma via an X chromosome inversion inv(X)(p11.2;q12), resulting in fusion of almost the entire splicing factor protein to the TFE3 DNA-binding domain.","method":"Cytogenetic and molecular analysis of tumor translocation/inversion","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct genomic characterization of chromosomal rearrangement; single lab","pmids":["9393982"],"is_preprint":false},{"year":1997,"finding":"p54nrb was shown to bind to the IAP proximal enhancer (IPE) DNA element and to transactivate a reporter gene in HeLa cell extracts. The DNA-binding domain maps to the N-terminal half and the activation domain to the C-terminal half. p54nrb also binds pre-mRNA, demonstrating dual roles in transcription and splicing.","method":"Protein purification, reporter gene assay in cell extracts, domain mapping","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro reconstitution-type assays and domain mapping; single lab","pmids":["9001221"],"is_preprint":false},{"year":2000,"finding":"PSF/p54nrb stimulates DNA topoisomerase I to jump between separate DNA helices without affecting the cleavage or religation half-reactions themselves, suggesting PSF/p54nrb mobilizes topoisomerase I after ligation.","method":"In vitro topoisomerase I jumping assay with oligonucleotide substrates","journal":"Biochemistry","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro reconstituted biochemical assay; single lab, mechanistically specific","pmids":["10858305"],"is_preprint":false},{"year":2000,"finding":"NonO/p54nrb was found to have carbonic anhydrase (CA) activity. Recombinant NonO generated in baculovirus bound to a CA inhibitor affinity column and revealed detectable CA activity (25 units/mg), identifying it as a nonclassical nuclear carbonic anhydrase.","method":"CA inhibitor affinity chromatography, CA activity measurements, recombinant protein expression in baculovirus","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — in vitro enzymatic assay with recombinant protein; single lab, unusual finding not widely replicated","pmids":["10821857"],"is_preprint":false},{"year":2001,"finding":"A multiprotein complex containing p54nrb, PSF, and matrin 3 binds specifically to inosine-containing (hyperedited) RNAs. This complex anchors hyperedited RNAs to the nuclear matrix, mediating their nuclear retention while allowing selectively edited mRNAs to be exported.","method":"HeLa nuclear extract fractionation, RNA affinity chromatography, Co-IP, nuclear matrix fractionation","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — biochemical reconstitution with nuclear extracts, multiple orthogonal methods (affinity purification, co-IP, nuclear matrix fractionation), rigorous controls","pmids":["11525732"],"is_preprint":false},{"year":2001,"finding":"p54nrb is cleaved/modified during Fas-induced apoptosis, as identified by 2D-gel proteome analysis of apoptotic Jurkat T cells with calculated caspase-3 cleavage sites.","method":"2D-PAGE proteomics, MALDI-TOF mass spectrometry, recombinant caspase-3 treatment","journal":"The Journal of biological chemistry","confidence":"Low","confidence_rationale":"Tier 3 / Weak — proteomic identification without direct functional mechanistic follow-up for p54nrb specifically","pmids":["11352910"],"is_preprint":false},{"year":2001,"finding":"PSF functions as a novel corepressor of nuclear hormone receptors (TR, RXR) by interacting with Sin3A and mediating silencing through recruitment of HDACs to the receptor DNA-binding domain. NonO/p54nrb was co-purified with PSF in this complex on TR and RXR, though p54nrb's independent contribution was not fully separated from PSF's.","method":"Biochemical purification, co-immunoprecipitation, reporter gene assay, in vivo studies with TR","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP and reporter assays, multiple receptors tested; primarily PSF-focused but p54nrb co-purified in complex","pmids":["11259580"],"is_preprint":false},{"year":2002,"finding":"p54nrb localizes to a novel nuclear compartment termed paraspeckles (10–20 per cell), which are discrete bodies in the interchromatin nucleoplasmic space often adjacent to splicing speckles. p54nrb interacts dynamically with nucleoli in a transcription-dependent fashion and relocalizes to nucleolar cap structures when transcription is inhibited.","method":"Immunofluorescence, YFP-PSP1 stable cell line live imaging, FRAP, fluorescence microscopy","journal":"Current biology : CB","confidence":"High","confidence_rationale":"Tier 2 / Strong — live-cell imaging, FRAP, multiple cell lines, transcription inhibition experiments with relocalization readout","pmids":["11790299"],"is_preprint":false},{"year":2002,"finding":"PSF and p54nrb/NonO bind specifically to the RNA polymerase II CTD (both hypo- and hyperphosphorylated forms) via affinity chromatography and co-immunoprecipitate with pol II holoenzyme. They can simultaneously interact with CTD and RNA, providing a physical link between pol II and pre-mRNA processing.","method":"CTD affinity chromatography, co-immunoprecipitation, RNA-binding assay","journal":"RNA (New York, N.Y.)","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP plus affinity chromatography, multiple pol II forms tested, orthogonal RNA-binding assay","pmids":["12358429"],"is_preprint":false},{"year":2002,"finding":"PSF and p54nrb interact with each other and bind U5 snRNA stem 1b via iterative selection and filter-binding assays. Both proteins associate with spliceosomes and the U4/U6.U5 tri-snRNP.","method":"RNA SELEX, filter-binding assay, RNA affinity selection, sedimentation analysis","journal":"RNA (New York, N.Y.)","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro RNA binding assays with structured substrate, sedimentation; single lab","pmids":["12403470"],"is_preprint":false},{"year":2002,"finding":"p54nrb and PSF form complexes with SF-1 on the CYP17 promoter. The SF-1/PSF/p54nrb/NonO complex is required for cAMP-dependent transcriptional activation of the CYP17 gene. SF-1 co-immunoprecipitates with p54nrb indicating direct interaction. PSF-recruited mSin3A and HDAC activity mediates repression of basal transcription.","method":"EMSA, co-immunoprecipitation, luciferase reporter assay, trichostatin A treatment","journal":"Endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP, EMSA, and functional reporter assays; single lab","pmids":["11897684"],"is_preprint":false},{"year":2004,"finding":"p54nrb associates with the 5' splice site within large complexes in HeLa cell nuclear extracts containing hyperphosphorylated RNA pol II (RNAPIIO) together with U1 or U1/U2 snRNPs, P-TEFb, TAT-SF1, TFIIF, PSF, and TLS. p54nrb and PSF can directly interact with the 5' splice site, suggesting they mediate contacts between RNAPII and snRNPs during coupled transcription/splicing.","method":"Nuclear extract fractionation, RNA-protein binding assay, immobilized DNA template assay","journal":"The EMBO journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional elongation complexes demonstrated with immobilized template; direct 5' SS binding shown; single lab","pmids":["15057275"],"is_preprint":false},{"year":2004,"finding":"PSF and p54nrb form a stable heteromeric complex that reconstitutes efficient DNA double-strand break rejoining in vitro when added to the other five known NHEJ polypeptides. The PSF·p54nrb complex cooperates with Ku protein to form a functional preligation complex with substrate DNA.","method":"In vitro NHEJ reconstitution assay, complex purification","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution of NHEJ with defined components, direct biochemical demonstration of complex formation with Ku","pmids":["15590677"],"is_preprint":false},{"year":2005,"finding":"p54nrb forms a heterodimer with PSP1 in vivo, and this interaction requires a specific domain within PSP1. The PSP1-p54nrb interaction is necessary but not sufficient for PSP1 paraspeckle targeting, which also requires an RNA-binding-capable RRM. Paraspeckle formation depends on RNA Pol II transcription.","method":"Co-immunoprecipitation, domain mapping by truncation mutants, DRB transcription inhibition, fluorescence microscopy","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP, domain mapping, transcription inhibition with reconstitution, live-cell imaging","pmids":["16148043"],"is_preprint":false},{"year":2005,"finding":"p54nrb is multiphosphorylated during mitosis. CDK1 (identified via roscovitine inhibition and cyclin B1 immunodepletion) phosphorylates the C-terminal extremity of p54nrb. A different kinase phosphorylates the N-terminal region. p54nrb interacts with the peptidylprolyl isomerase Pin1 via three C-terminal threonine residues, with binding favored when at least two are phosphorylated, suggesting regulation by phosphorylation-dependent conformational changes.","method":"Phospho-specific antibody staining, CDK inhibitor treatment, immunodepletion, site-directed mutagenesis, Pin1 interaction assay","journal":"Journal of molecular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — CDK inhibitor, immunodepletion, and mutagenesis all used orthogonally in single study","pmids":["15701524"],"is_preprint":false},{"year":2005,"finding":"PSF and p54nrb preferentially bind strong transcriptional activation domains and preferentially bind the full-length pol II CTD (52 repeats) rather than a truncated 15-repeat CTD. Elevated PSF expression bypasses the requirement for a strong activator for efficient splicing and 3'-end cleavage. PSF/p54nrb-dependent stimulation of splicing primarily affects first intron removal.","method":"Affinity chromatography, transfection/overexpression, reporter assay, CTD truncation mutants","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple functional assays (affinity chromatography, overexpression, CTD truncation); single lab","pmids":["16024807"],"is_preprint":false},{"year":2006,"finding":"p54nrb is a component of the snRNP-free U1A (SF-A) complex that also contains PSF and p68. Immunodepletion of p54nrb followed by reconstitution experiments showed that p54nrb is critical for pre-mRNA cleavage during polyadenylation.","method":"TAP purification, mass spectrometry, immunodepletion, reconstitution, in vitro polyadenylation assay","journal":"RNA (New York, N.Y.)","confidence":"High","confidence_rationale":"Tier 1 / Moderate — TAP purification, immunodepletion + reconstitution for functional validation; single lab","pmids":["16373496"],"is_preprint":false},{"year":2006,"finding":"Nuclear N-WASP exists in a large nuclear complex containing PSF-NonO/p54nrb, nuclear actin, and RNA polymerase II. The interaction of N-WASP with the PSF-NonO complex couples N-WASP to RNA pol II to regulate transcription. N-WASP-mediated nuclear actin polymerization contributes to this regulation.","method":"Co-immunoprecipitation, nuclear complex purification, transcription reporter assay","journal":"Nature cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP and functional reporter assays with nuclear actin polymerization readout; single lab","pmids":["16767080"],"is_preprint":false},{"year":2007,"finding":"p54nrb/NonO is required for cAMP-dependent activation of CREB target genes in vivo. TORC2 and NONO complex on cAMP-responsive promoters, and NONO acts as a bridge between the CREB/TORC complex and RNA polymerase II.","method":"High-throughput coactivator trap screen, RNAi knockdown, chromatin immunoprecipitation (ChIP)","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RNAi knockdown with defined target gene readout, ChIP for complex on promoter; single lab","pmids":["18077367"],"is_preprint":false},{"year":2007,"finding":"p54nrb/NonO physically associates with XRN2 via PSF/p54nrb acting as a bridge. p54nrb is present along the length of genes, is required for degradation of the 3'-cleaved RNA downstream of the poly(A) site in vitro, and its siRNA knockdown leads to defects in XRN2 recruitment and transcription termination in vivo.","method":"Co-immunoprecipitation, in vitro 3' processing assay, siRNA knockdown, ChIP","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vitro processing assay, siRNA knockdown with in vivo termination readout, ChIP, multiple orthogonal methods","pmids":["17639083"],"is_preprint":false},{"year":2007,"finding":"PSF and p54nrb bind RNAs containing AU-rich elements (AREs), including the TNFα mRNA. PSF is phosphorylated by Mnk kinases at two sites in vitro and in vivo, and Mnk-mediated phosphorylation increases the binding of PSF to TNFα mRNA in living cells.","method":"In vitro kinase assay, mass spectrometry, RNA immunoprecipitation (RIP), cap-resin pulldown","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro kinase assay plus in vivo RIP showing phosphorylation-dependent RNA binding; single lab","pmids":["17965020"],"is_preprint":false},{"year":2007,"finding":"p54nrb and PSF interact with the two COX-2 upstream sequence elements (USEs). Tethering p54nrb to COX-2 USE mutant RNA compensates for the cis-acting elements in polyadenylation. p54nrb, PTB, PSF, and U1A may interact as a complex since co-immunoprecipitation of MS2 fusion proteins coprecipitates the other partners.","method":"RNA pulldown with biotinylated oligonucleotides, MS2 tethering assay, co-immunoprecipitation","journal":"RNA (New York, N.Y.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — tethering assay plus co-IP; single lab, multiple orthogonal approaches","pmids":["17507659"],"is_preprint":false},{"year":2007,"finding":"p54nrb physically interacts with Sox9 and enhances Sox9-dependent transcriptional activation of the Col2a1 promoter. p54nrb colocalizes with Sox9 in nuclear paraspeckle bodies in ATDC5 cells. A p54nrb mutant lacking RNA recognition motifs dominantly inhibits Col2a1 mRNA maturation, chondrocyte differentiation in vitro and in mesenchymal explants, and causes dwarfism in transgenic mice.","method":"Co-immunoprecipitation, reporter assay, dominant-negative RRM mutant overexpression, transgenic mouse model, RNA maturation assay","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (co-IP, reporter, dominant-negative, transgenic mouse phenotype), in vitro and in vivo","pmids":["18677406"],"is_preprint":false},{"year":2008,"finding":"p54nrb binds both BRG1 and Brm (catalytic subunits of the SWI/SNF complex) and the core subunit BAF60a. The N-terminal region of p54nrb is sufficient to pull down other SWI/SNF core subunits. Brm in concert with p54nrb co-localizes at a TERT alternative splicing acceptor site and modulates TERT splicing (promoting exon-inclusion) and transcription.","method":"Pulldown assay, co-immunoprecipitation, shRNA knockdown, ChIP, RT-PCR splicing analysis","journal":"The Biochemical journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pulldown, co-IP, ChIP, and splicing assays; single lab","pmids":["18042045"],"is_preprint":false},{"year":2008,"finding":"mRNAs containing inverted Alu repeats in their 3'-UTR are retained in the nucleus and associate with p54nrb in a manner that correlates with A-to-I RNA editing. The Nicolin 1 mRNA isoform containing inverted Alu repeats is retained in the nucleus while the isoform lacking these sequences is exported, identifying p54nrb as a component of a gene silencing mechanism mediated by Alu elements.","method":"EGFP reporter assay, nuclear/cytoplasmic fractionation, RNA immunoprecipitation","journal":"The EMBO journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reporter assay with direct p54nrb co-immunoprecipitation, endogenous gene validation; single lab","pmids":["18497743"],"is_preprint":false},{"year":2009,"finding":"p54nrb/PSF and PSP1 are expressed in human embryonic stem cells but paraspeckles are absent; paraspeckle assembly requires NEAT1 lncRNA expression, which is absent in hESCs and induced upon differentiation. Knockdown of NEAT1 in HeLa cells results in loss of paraspeckles and enhanced cytoplasmic export of mRNAs containing inverted Alu repeats.","method":"siRNA knockdown of NEAT1, immunofluorescence, nuclear/cytoplasmic fractionation, hESC differentiation","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — NEAT1 knockdown with both structural (paraspeckle loss) and functional (mRNA export) readouts, hESC differentiation model","pmids":["19716791"],"is_preprint":false},{"year":2009,"finding":"p54/nrb and PSF selectively associate with and stabilize the longer MENbeta (NEAT1_2) lncRNA isoform among the two paraspeckle ncRNAs (MENepsilon/MENbeta), contributing to paraspeckle structural organization. Removal of MENepsilon/beta by knockdown results in paraspeckle disintegration.","method":"RNA immunoprecipitation, siRNA knockdown, immunofluorescence","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — RNA-IP showing selective isoform binding, functional knockdown with structural readout, replicated findings across two labs (PMID 19716791)","pmids":["19188602"],"is_preprint":false},{"year":2009,"finding":"p54nrb contributes to rapid and accurate repair of DNA double-strand breaks in vivo. siRNA-mediated p54nrb knockdown delays DSB repair (gamma-H2AX focus assay) and stable miRNA knockdown cell lines show increased ionizing radiation-induced chromosomal aberrations and increased radiosensitivity in clonogenic assay.","method":"siRNA/miRNA knockdown, gamma-H2AX focus assay, clonogenic survival assay, chromosomal aberration analysis","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple in vivo DNA repair assays (foci, chromosomal aberrations, survival) with specific knockdown; single lab but three orthogonal readouts","pmids":["19759212"],"is_preprint":false},{"year":2009,"finding":"p54nrb interacts with hnRNP M via co-immunoprecipitation and pulldown assays, co-localizes with PSF in a subset of nuclear paraspeckles, and co-fractionates with PSF and p54nrb in the nuclear matrix. PSF and hnRNP M have opposing effects on alternative splicing: hnRNP M promotes exon skipping while PSF favors inclusion, and their antagonism requires hnRNP M domains capable of interacting with PSF/p54nrb.","method":"Co-immunoprecipitation, pulldown, immunofluorescence, nuclear matrix fractionation, PPT minigene splicing assay","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP and functional splicing assay; single lab","pmids":["19874820"],"is_preprint":false},{"year":2009,"finding":"p54nrb is a transcriptional corepressor of the progesterone receptor (PR) independent of PSF. p54nrb interacts directly with PR in a ligand-independent manner. p54nrb recruits mSin3A through its N-terminus to the PR-DNA complex, resulting in inhibition of PR-mediated transactivation. Knockdown of p54nrb alleviates PR-mediated repression on connexin 43 (Gja1) transcription.","method":"Co-immunoprecipitation, luciferase reporter assay, ChIP, siRNA knockdown, site-directed mutagenesis","journal":"Molecular endocrinology (Baltimore, Md.)","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (co-IP, reporter, ChIP, knockdown) with specific mechanistic placement; single lab","pmids":["19423654"],"is_preprint":false},{"year":2011,"finding":"Mitotic CDK1-mediated phosphorylation of p54nrb reduces its general RNA-binding ability. In vitro CDK1 phosphorylation of GST-p54nrb abolishes interaction with 5' splice site RNA and homoribopolymers poly(A), poly(C), and poly(U) but not poly(G). Threonine 15 (N-terminal to the tandem RRM domains) is required for this inhibition by mutagenesis. Neat1 ncRNA co-immunoprecipitates with p54nrb in both interphase and mitotic cells, indicating that p54nrb-Neat1 interaction is not modulated by phosphorylation.","method":"In vitro kinase assay (CDK1), RNA binding assay, site-directed mutagenesis (T15), co-immunoprecipitation, cell synchronization","journal":"Biochemistry and cell biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro kinase assay plus RNA binding with mutagenesis validation; single lab with multiple orthogonal assays","pmids":["21819346"],"is_preprint":false},{"year":2011,"finding":"PP1 forms a protein complex with p54nrb and PSF, interacting directly with p54nrb via its RVxF motif. PP1 association results in dephosphorylation of p54nrb and PSF, leading to loss of their transcriptional corepressor activities and altered alternative splicing activities (shifting from exon inclusion to exon skipping). Dephosphorylation changes p54nrb/PSF interactions with Sin3A, HDAC1, U1A and U2AF.","method":"Co-immunoprecipitation, RVxF motif mutagenesis, luciferase reporter assay, CD44 minigene splicing assay, in vivo phosphorylation analysis","journal":"Molecular endocrinology (Baltimore, Md.)","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP with motif mutagenesis and multiple functional readouts (reporter, splicing, partner interactions); single lab","pmids":["21566083"],"is_preprint":false},{"year":2012,"finding":"p54nrb forms a complex with ILF3 that binds to the survivin promoter to regulate survivin expression. The small molecule YM155 binds ILF3 and disrupts the ILF3/p54nrb complex, resulting in different subcellular localization of the two proteins and suppression of survivin expression.","method":"Co-immunoprecipitation, ChIP, immunofluorescence localization, YM155 treatment","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — co-IP and ChIP with pharmacological disruption; single lab","pmids":["22842455"],"is_preprint":false},{"year":2013,"finding":"NonO/p54nrb binds to the rhodopsin distal enhancer region (RER) as validated by ChIP-seq showing high NonO occupancy at rhodopsin and phototransduction genes. NonO and its interactors (hnRNP M, Ywhaz, Ppp1ca) activate the rhodopsin promoter in HEK293 cells synergistically with NRL and CRX; the DNA-binding domain of NonO is critical. shRNA knockdown of NonO in mouse retina leads to loss of rhodopsin expression, rod cell death, splicing defects, and altered expression of phototransduction genes.","method":"Mass spectrometry identification, co-immunoprecipitation, ChIP-seq, luciferase reporter assay, shRNA knockdown in retina, RNA-seq","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP-seq, in vivo shRNA with multiple phenotypic readouts, promoter domain deletion mapping; single lab but multiple orthogonal methods","pmids":["24301678"],"is_preprint":false},{"year":2013,"finding":"During apoptosis induced by TRAIL, PTB forms a remodeled complex with PSF and NONO/p54nrb among others. Increased expression of NONO/p54nrb accelerates apoptosis. These proteins post-transcriptionally regulate apoptosis rates by interacting with and stimulating IRES activity in mRNAs translated during apoptosis.","method":"Co-immunoprecipitation, overexpression/knockdown with apoptosis rate measurement, IRES reporter assay","journal":"Cell death and differentiation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP plus functional IRES reporter and apoptosis rate assay; single lab","pmids":["24141718"],"is_preprint":false},{"year":2014,"finding":"p54nrb/NonO and PSF promote U snRNA nuclear export by accelerating assembly of the U snRNA export complex. As a heterodimer, they accelerate the recruitment of PHAX, and subsequently CRM1 and Ran, onto RNA substrates in vitro, mediating efficient U snRNA export in vivo.","method":"In vitro U snRNA export complex assembly assay, microinjection/in vivo export assay","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution of export complex assembly plus in vivo validation; single lab","pmids":["24413662"],"is_preprint":false},{"year":2015,"finding":"CARM1 (coactivator-associated arginine methyltransferase 1) methylates the coiled-coil domain of p54nrb, resulting in reduced binding of p54nrb to mRNAs containing inverted Alu repeats (IRAlus). CARM1 also suppresses NEAT1 transcription to reduce paraspeckle formation. Both mechanisms together promote nuclear export of IRAlu-containing mRNAs, especially under poly(I:C) stress.","method":"Co-immunoprecipitation, in vitro methylation assay, RNA immunoprecipitation, NEAT1 knockdown, poly(I:C) treatment, nuclear/cytoplasmic fractionation","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro methylation assay identifying specific domain target, RIP showing functional consequence, multiple orthogonal approaches","pmids":["25792598"],"is_preprint":false},{"year":2015,"finding":"The SFPQ·NONO native complex purified from HeLa cells binds DNA independently of free ends (unlike Ku), has DNA pairing activity in a microwell assay, and stimulates DNA-dependent protein kinase (DNA-PKcs) autophosphorylation. These findings suggest SFPQ·NONO promotes end joining by binding internal DNA sequences and stabilizing a synaptic pre-ligation complex without occluding DNA termini.","method":"Native complex purification from HeLa cells, microwell-based DNA binding/pairing assay, DNA-PK autophosphorylation assay","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro biochemical assays with purified native complex, multiple assay types; single lab","pmids":["25998385"],"is_preprint":false},{"year":2015,"finding":"p54nrb/NONO binds the nuclear form of SREBP-1a, and the conserved Y267 residue of p54nrb is required for this interaction. p54nrb binding to nuclear SREBP-1a increases its protein stability, stimulating SREBP-1-mediated transcription of lipogenic genes and lipid production in breast cancer cells.","method":"Co-immunoprecipitation, site-directed mutagenesis (Y267), reporter assay, in vitro and in vivo tumor growth assays","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP plus mutagenesis with functional reporter and in vivo tumor readout; single lab","pmids":["26148231"],"is_preprint":false},{"year":2015,"finding":"p54nrb/NONO regulates glucocorticoid production by modulating the splicing of multiple phosphodiesterase (PDE) isoforms and facilitating the interaction between XRN2 and select PDE transcripts to regulate their stability. Silencing p54nrb in H295R adrenocortical cells decreases cAMP production and cortisol biosynthesis in response to ACTH.","method":"siRNA knockdown, RT-PCR splicing analysis, RNA stability assay, co-immunoprecipitation","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA knockdown with defined splicing and mRNA stability readouts, co-IP; single lab","pmids":["25605330"],"is_preprint":false},{"year":2015,"finding":"p54nrb/NONO transcriptionally regulates the lncRNA PCGEM1 by binding its promoter in response to androgen deprivation. Suppression of p54nrb reduces PCGEM1, and re-expression restores it. DIM (3,3'-diindolylmethane) suppresses PCGEM1 by preventing the interaction of p54nrb with the PCGEM1 promoter.","method":"siRNA/CRISPR KO, rescue experiments, ChIP showing p54nrb on PCGEM1 promoter","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP, KO with rescue, pharmacological disruption; single lab","pmids":["27682980"],"is_preprint":false},{"year":2016,"finding":"Progesterone-liganded nuclear PRB forms a complex including JUN/JUN homodimers and P54nrb/Sin3A/HDAC to repress transcription of the labor gene Cx43. Unliganded PRA paradoxically activates Cx43 transcription. Increased 20α-HSD expression reduces nuclear progesterone levels during labor, switching PR from liganded to unliganded state.","method":"Co-immunoprecipitation, ChIP, reporter assay, siRNA knockdown, immunofluorescence","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP and ChIP with functional reporter data; single lab","pmids":["27220952"],"is_preprint":false},{"year":2016,"finding":"The structure of p54nrb/NonO RRM1 was determined by NMR, revealing a canonical fold (β1α1β2β3α2β4) with conserved aromatic amino acids. Only RRM1 (not RRM2) binds to 5' splice site RNA. The binding interface was mapped by NMR and the affinity was determined by fluorescence quenching. Phosphorylation of T15 (N-terminal to RRM1) inhibits RNA binding except for G-rich RNAs.","method":"NMR structure determination, fluorescence quenching binding assay, in vitro RNA binding","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — NMR structure with binding interface mapping and quantitative affinity measurement; single lab but high method quality","pmids":["27064654"],"is_preprint":false},{"year":2016,"finding":"Crystal structure of NONO homodimer was obtained at 2.6 Å resolution by molecular replacement. NONO crystallizes as a superhelical arrangement of six NONO homodimers, establishing that NONO is an obligatory homodimer. L-proline stabilizes purified NONO homodimers and prevents aggregation.","method":"X-ray crystallography, SAXS","journal":"Acta crystallographica. Section D, Structural biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — X-ray crystallography at 2.6 Å with molecular replacement; structural determination of homodimeric architecture","pmids":["27303796"],"is_preprint":false},{"year":2016,"finding":"Tyrosine residues of p54nrb are not phosphorylated (p54nrb shows non-specific binding to anti-phosphotyrosine antibodies). However, replacement of tyrosine residues with phenylalanine altered p54nrb activities in transcriptional co-repression and RNA splicing in a gene context-dependent manner by differentially regulating p54nrb protein associations with interacting partners.","method":"Site-directed mutagenesis (Y-to-F substitutions), luciferase reporter assay, minigene splicing assay, co-immunoprecipitation, confocal microscopy","journal":"Journal of cellular physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — comprehensive mutagenesis with multiple functional assays; single lab","pmids":["27430900"],"is_preprint":false},{"year":2017,"finding":"NEAT1 depletion releases sequestered P54nrb and PSF from paraspeckles to facilitate IRES-dependent translation of c-Myc mRNA. Increased association of P54nrb and PSF with c-Myc mRNA was observed in NEAT1-depleted cells under RNAP I inhibition (CX5461 treatment).","method":"Antisense oligonucleotide-mediated NEAT1 knockdown, RNA immunoprecipitation (RIP), immunofluorescence","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RIP showing p54nrb-mRNA association change upon NEAT1 knockdown; single lab","pmids":["28288210"],"is_preprint":false},{"year":2018,"finding":"CARM1 accumulates in nuclear granules (mostly paraspeckles) at the 2- to 4-cell stage of mouse embryo development. The paraspeckle component NEAT1 and its partner p54nrb are required for CARM1's association with paraspeckles and for H3R26 methylation. Conversely, CARM1 influences paraspeckle organization. Depletion of p54nrb results in arrest at the 16- to 32-cell stage with elevated Cdx2, indicating that paraspeckles (with p54nrb as a component) act upstream of CARM1 in early embryo cell fate determination.","method":"Immunofluorescence in mouse embryos, p54nrb depletion (siRNA/morpholino), H3R26 methylation analysis, developmental arrest assay","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo depletion in mouse embryos with H3R26 methylation readout and lineage fate phenotype; multiple orthogonal approaches","pmids":["30550788"],"is_preprint":false},{"year":2019,"finding":"P54nrb interacts with RNase H1 via its core domains; toxic phosphorothioate antisense oligonucleotides (PS-ASOs) form a complex that includes RNase H1, P54nrb, and PSF (but safe PS-ASOs do not). P54nrb RRM1 and RRM2 are required for PS-ASO binding. The protein-protein interaction between P54nrb and RNase H1 requires the spacer region of RNase H1. RNA is also a required component of this complex.","method":"NanoLuciferase structural complementation reporter (real-time in live cells), in vitro binding assay, domain deletion analysis","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — live-cell real-time protein interaction reporter plus in vitro binding with domain mapping; single lab","pmids":["31495875"],"is_preprint":false},{"year":2020,"finding":"NONO promotes BIN1 exon 12a inclusion (oncogenic splicing switch) through interaction with DHX9 and SFPQ forming a DHX9-NONO-SFPQ complex. Knockdown of NONO abolishes liver cancer cell proliferation, migration, and BIN1-L expression, while BIN1-L stabilizes PLK1 by preventing cullin 3-mediated ubiquitination.","method":"RNA-seq, co-immunoprecipitation, siRNA knockdown, minigene splicing assay, tumor formation assay","journal":"Hepatology (Baltimore, Md.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP showing ternary complex, RNA-seq splicing analysis with siRNA validation; single lab","pmids":["31815296"],"is_preprint":false},{"year":2020,"finding":"SFPQ, in complex with p54nrb, binds and regulates the activity of splicing factor SRSF2 under platinum treatment. The SFPQ/p54nrb complex decreases SRSF2 binding to caspase-9 RNA, favoring expression of the antiapoptotic caspase-9b isoform and contributing to chemoresistance.","method":"Co-immunoprecipitation, RNA immunoprecipitation, siRNA knockdown, alternative splicing analysis","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP and RIP showing mechanistic link between SFPQ/NONO complex, SRSF2, and caspase-9 splicing; single lab","pmids":["32332923"],"is_preprint":false},{"year":2021,"finding":"NONO interacted with and stabilized both HIF-1α and HIF-2α complexes, activating transcription of hypoxia-induced genes. NONO also bound pre-mRNA and mature mRNA of HIF-1/2 targets to facilitate splicing and mRNA stability. NONO knockout disrupted expression of HIF-1/2 targets and impeded hypoxia-enhanced progression in hepatocellular carcinoma.","method":"Co-immunoprecipitation, RNA immunoprecipitation, NONO knockout, in vitro/in vivo tumor assays, ChIP","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP and RIP with KO validation; multiple readouts but single lab","pmids":["34079086"],"is_preprint":false},{"year":2022,"finding":"p54nrb is a substrate of caspase-2, which cleaves p54nrb at D422, disrupting its C-terminal DNA-binding region. Loss or cleavage of p54nrb results in altered expression of oncogenic genes including cathepsin-Z and gelsolin. p54nrb interacts with cathepsin-Z and gelsolin DNA (but not RNA). Loss of p54nrb increases cell death susceptibility in tumor cell lines.","method":"In vitro caspase-2 cleavage assay, quantitative proteomics, ChIP (DNA interaction), siRNA/CRISPR knockdown/KO, cell death assay","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro caspase cleavage assay identifying cleavage site, ChIP for DNA interaction, loss-of-function with multiple tumor cell lines","pmids":["35444189"],"is_preprint":false},{"year":2022,"finding":"Lysine 371 of p54nrb is reversibly acetylated: acetyltransferase GCN5 acetylates K371, and deacetylase SIRT1 removes the modification. GCN5-mediated acetylation attenuates recruitment of p54nrb to its core binding motif within the IL-8 gene promoter, increasing IL-8 expression; SIRT1-mediated deacetylation reverses this.","method":"Site-directed mutagenesis (K371), co-immunoprecipitation, ChIP, luciferase reporter assay, in vitro acetylation assay","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — site-directed mutagenesis plus ChIP and in vitro acetylation; single lab","pmids":["35843094"],"is_preprint":false},{"year":2022,"finding":"p54nrb/NONO significantly interacted with nuclear EGFR in triple-negative breast cancer. NONO increased the stability of nuclear EGFR and recruited CBP/p300, enhancing EGFR transcriptional activity. In turn, EGFR positively regulated NONO's affinity to mRNAs of EGFR downstream genes.","method":"Co-immunoprecipitation, proximity ligation assay, siRNA knockdown, reporter assay, protein stability assay","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP and stability assay; single lab with multiple approaches","pmids":["35013116"],"is_preprint":false},{"year":2022,"finding":"Paraspeckle proteins p54nrb and PSPC1 function as IRES trans-acting factors (ITAFs) for subgroups of (lymph)angiogenic and cardioprotective factor mRNAs during hypoxia. NEAT1 and IRES-containing mRNAs are recruited into paraspeckles during hypoxia. Paraspeckles act as a platform for IRESome assembly and IRES-dependent translation.","method":"siRNA knockdown, polysome profiling, smiFISH for mRNA localization, mass spectrometry, IRES reporter assay","journal":"eLife","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (knockdown, smiFISH, proteomics, IRES reporter); single lab","pmids":["36546462"],"is_preprint":false},{"year":2024,"finding":"Nono deletion in murine KP lung cancer cells impairs the DNA damage response to etoposide and bleomycin, with hyperactivation of DSB signaling, reduced RNA pol II promoter occupancy, impaired nascent RNA synthesis, and attenuated induction of Gadd45b. Gadd45b is identified as a putative Nono-dependent effector of the DDR, indicating Nono mediates a genome-protective crosstalk between the DDR and RNA metabolism.","method":"CRISPR/Cas9 Nono deletion, gamma-H2AX assay, Pol II ChIP, nascent RNA synthesis assay, RT-PCR/Western blot for Gadd45b","journal":"Life science alliance","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO with multiple mechanistic readouts; single lab, identifying Gadd45b as downstream effector","pmids":["38843934"],"is_preprint":false},{"year":2025,"finding":"GYS1 (glycogen synthase 1) complexes with NONO/p54nrb in the nucleus and undergoes liquid-liquid phase separation with NONO to form nuclear condensates, leading to GYS1 nuclear retention and inhibition of glycogen biosynthesis. NONO and nGYS1 co-condense with MyoD and preinitiation complex (PIC) proteins to form transcriptional condensates, driving myogenic gene expression. Nono-deficient mice exhibit exercise intolerance, higher muscle glycogen content, smaller myofibers, and impaired muscle regeneration.","method":"Co-immunoprecipitation, FRAP, in vitro phase separation assay, Nono knockout mice, C2C12 differentiation assay, cardiotoxin muscle regeneration model, ChIP","journal":"Cell death and differentiation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP and phase separation assays with in vivo KO mouse validation; single lab","pmids":["40200092"],"is_preprint":false}],"current_model":"NONO/p54nrb is an obligatory homodimeric (or PSF-heterodimeric) DBHS-family nuclear scaffold protein that functions at multiple steps of gene regulation: it binds the RNA pol II CTD and 5' splice sites to couple transcription with pre-mRNA splicing; retains hyperedited (inosine-containing) mRNAs in the nucleus via a matrin 3/PSF complex anchored to the nuclear matrix; is an essential structural component of paraspeckles (dependent on NEAT1 lncRNA), where it sequesters IRAlu-containing mRNAs for regulated export; acts as a corepressor of nuclear hormone receptors (PR, AR, TR/RXR) by recruiting Sin3A/HDAC complexes; serves as a coactivator for SF-1-dependent and CREB/TORC-dependent transcription; recruits XRN2 to facilitate RNA pol II transcription termination; participates in non-homologous end joining by forming a pre-ligation synaptic complex with Ku protein; and undergoes post-translational modifications (CDK1 phosphorylation of T15 reducing RNA binding during mitosis; CARM1 methylation of the coiled-coil domain reducing IRAlu-mRNA binding; GCN5 acetylation of K371 modulating promoter binding; caspase-2 cleavage at D422 disrupting its C-terminal DNA-binding region) that regulate its diverse activities."},"narrative":{"mechanistic_narrative":"NONO (p54nrb) is a DBHS-family nuclear RNA/DNA-binding protein that couples transcription to RNA processing and serves as a multifunctional gene-regulatory scaffold [PMID:8371983, PMID:12358429]. Defined by tandem RNA recognition motifs and a DBHS segment shared with the splicing factor PSF/SFPQ, it functions as an obligatory homodimer or as a PSF/SFPQ heterodimer, with crystallographic and NMR analyses establishing the homodimeric architecture and showing that RRM1 alone engages 5' splice-site RNA [PMID:27064654, PMID:27303796]. NONO physically binds the RNA polymerase II CTD (both phosphoforms) and 5' splice sites within elongation-competent complexes containing snRNPs and elongation factors, providing a physical bridge between transcription and pre-mRNA splicing, 3'-end cleavage/polyadenylation, and termination, the last through recruitment of the exonuclease XRN2 [PMID:12358429, PMID:15057275, PMID:16373496, PMID:17639083]. It is an essential structural component of paraspeckles, nuclear bodies whose assembly depends on the NEAT1 (MENε/β) lncRNA that NONO binds and stabilizes; within these bodies and an associated matrin-3/PSF complex, NONO retains inosine-hyperedited and inverted-Alu (IRAlu)-containing mRNAs at the nuclear matrix to control their export [PMID:11525732, PMID:11790299, PMID:18497743, PMID:19716791, PMID:19188602]. NONO additionally acts as a sequence-specific DNA-binding transcriptional regulator: it represses nuclear hormone receptors such as the progesterone receptor by recruiting Sin3A/HDAC, and coactivates SF-1- and CREB/TORC-dependent transcription by bridging activators to pol II [PMID:19423654, PMID:11897684, PMID:18077367]. In genome maintenance it forms, as an SFPQ·NONO complex, a Ku-cooperating synaptic pre-ligation complex that reconstitutes non-homologous end joining and is required for efficient double-strand-break repair in cells [PMID:15590677, PMID:25998385, PMID:19759212]. Its diverse activities are gated by post-translational modification, including mitotic CDK1 phosphorylation of Thr15 that suppresses RNA binding, CARM1 methylation of the coiled-coil that reduces IRAlu-mRNA binding, GCN5/SIRT1-reversible acetylation of Lys371 controlling promoter occupancy, and caspase-2 cleavage at Asp422 that disrupts its C-terminal DNA-binding region [PMID:21819346, PMID:25792598, PMID:35843094, PMID:35444189].","teleology":[{"year":1993,"claim":"Established NONO's molecular identity, defining it as a tandem-RRM protein closely related to PSF within a conserved DBHS segment, predicting a role in pre-mRNA splicing.","evidence":"Protein purification, cDNA cloning and sequence analysis from HeLa cells","pmids":["8371983"],"confidence":"Medium","gaps":["Functional role inferred from homology, not yet demonstrated","No partner or substrate identified"]},{"year":1997,"claim":"Demonstrated NONO has dual transcription and splicing activities by mapping a separable N-terminal DNA-binding domain and C-terminal activation domain on a defined enhancer element.","evidence":"Protein purification, reporter gene assay in cell extracts, domain mapping","pmids":["9001221"],"confidence":"Medium","gaps":["In vitro/extract-based; physiological promoter targets unclear","Disease relevance of the TFE3 fusion not mechanistically resolved"]},{"year":2002,"claim":"Provided the physical basis for transcription-splicing coupling by showing NONO/PSF bind the pol II CTD and snRNAs while simultaneously contacting RNA, and identified paraspeckles as a NONO-resident nuclear compartment.","evidence":"CTD affinity chromatography and co-IP with pol II holoenzyme; RNA SELEX/filter binding to U5 snRNA; live-cell imaging and FRAP","pmids":["12358429","12403470","11790299"],"confidence":"High","gaps":["Whether CTD binding is direct or complex-mediated not fully resolved","Paraspeckle function not yet defined at this stage"]},{"year":2001,"claim":"Defined a nuclear-retention function: a NONO/PSF/matrin-3 complex anchors hyperedited inosine-containing RNAs to the nuclear matrix to gate their export.","evidence":"Nuclear extract fractionation, RNA affinity chromatography, co-IP, nuclear matrix fractionation","pmids":["11525732"],"confidence":"High","gaps":["NONO's specific contribution within the trimeric complex not isolated","Selectivity for edited vs. unedited transcripts mechanism incomplete"]},{"year":2004,"claim":"Extended NONO beyond RNA metabolism into genome maintenance by showing the PSF·p54nrb heterodimer reconstitutes NHEJ and cooperates with Ku in a pre-ligation complex.","evidence":"In vitro NHEJ reconstitution with defined components and complex purification","pmids":["15590677"],"confidence":"High","gaps":["In vivo requirement not yet shown at this stage","Mechanism of synapsis vs. ligase stimulation not separated"]},{"year":2009,"claim":"Anchored paraspeckle assembly to a specific lncRNA, showing NEAT1 is required for paraspeckle formation and that NONO selectively binds/stabilizes the NEAT1_2 isoform, linking the body to IRAlu-mRNA retention.","evidence":"NEAT1 siRNA/ASO knockdown, RNA-IP, immunofluorescence, hESC differentiation, nuclear/cytoplasmic fractionation","pmids":["19716791","19188602","18497743"],"confidence":"High","gaps":["Stoichiometry of NONO on NEAT1 not defined","How editing status is sensed to select retained transcripts unresolved"]},{"year":2009,"claim":"Established NONO as a PSF-independent transcriptional corepressor of nuclear hormone receptors, directly binding the progesterone receptor and recruiting mSin3A to silence target genes.","evidence":"Co-IP, luciferase reporter, ChIP, siRNA knockdown, mutagenesis","pmids":["19423654"],"confidence":"High","gaps":["Breadth of receptor targets beyond PR not mapped","Switch between corepressor and coactivator modes not defined"]},{"year":2009,"claim":"Confirmed an in vivo genome-protective role by showing NONO depletion delays DSB repair and increases radiosensitivity and chromosomal aberrations.","evidence":"siRNA/miRNA knockdown, gamma-H2AX foci, clonogenic survival, chromosomal aberration analysis","pmids":["19759212"],"confidence":"High","gaps":["Repair pathway choice (NHEJ vs. other) in cells not delineated","Relationship to its RNA functions in repair unclear"]},{"year":2007,"claim":"Mechanistically connected NONO to transcription termination and 3'-end metabolism, showing it bridges XRN2 to genes and is required for downstream-RNA degradation and termination.","evidence":"Co-IP, in vitro 3' processing assay, siRNA knockdown, ChIP","pmids":["17639083"],"confidence":"High","gaps":["Direct vs. PSF-mediated XRN2 contact not separated","Genome-wide scope of termination defects not assessed"]},{"year":2016,"claim":"Provided structural definition of the dimer and RNA-binding module, establishing NONO as an obligate homodimer and identifying RRM1 as the 5' splice-site-binding domain regulated by Thr15 phosphorylation.","evidence":"X-ray crystallography (2.6 Å) and SAXS of the homodimer; NMR of RRM1 with fluorescence-quenching affinity measurement","pmids":["27303796","27064654"],"confidence":"High","gaps":["Structure of full-length protein with RNA not solved","Heterodimer (with PSF) interface not crystallized here"]},{"year":2015,"claim":"Showed that arginine methylation gates the nuclear-retention function, with CARM1 methylating the coiled-coil to reduce IRAlu-mRNA binding and suppress NEAT1, promoting export under stress.","evidence":"In vitro methylation assay, co-IP, RNA-IP, NEAT1 knockdown, poly(I:C) treatment, fractionation","pmids":["25792598"],"confidence":"High","gaps":["Site-resolution of methylated residues incomplete","Stress-signal-to-CARM1 link not defined"]},{"year":2011,"claim":"Defined cell-cycle and phosphatase control of NONO activity: CDK1 phosphorylation of Thr15 abolishes RNA binding during mitosis while PP1 dephosphorylation reprograms its corepressor and splicing functions.","evidence":"In vitro CDK1 kinase and RNA-binding assays with T15 mutagenesis; PP1 co-IP with RVxF mutagenesis and splicing/reporter assays","pmids":["21819346","21566083"],"confidence":"High","gaps":["Identity of the N-terminal-region kinase not established","How NEAT1 binding escapes phospho-regulation not explained"]},{"year":2018,"claim":"Placed NONO/paraspeckles upstream of CARM1 and chromatin marking in early development, showing p54nrb is required for CARM1 paraspeckle association, H3R26 methylation, and proper cell-fate determination.","evidence":"Immunofluorescence in mouse embryos, p54nrb depletion, H3R26 methylation analysis, developmental-arrest phenotype","pmids":["30550788"],"confidence":"High","gaps":["Direct vs. paraspeckle-structural role in CARM1 recruitment unresolved","Target genes governing the Cdx2 phenotype not fully mapped"]},{"year":2013,"claim":"Demonstrated tissue-specific transcriptional and splicing control by NONO at a defined locus, showing it occupies the rhodopsin enhancer with NRL/CRX and is required for rod survival in vivo.","evidence":"ChIP-seq, co-IP, reporter assay, shRNA knockdown in mouse retina, RNA-seq","pmids":["24301678"],"confidence":"High","gaps":["Generality of enhancer occupancy across cell types not addressed","Coupling of its transcription vs. splicing roles at the locus not separated"]},{"year":2022,"claim":"Identified additional PTM-based gating of DNA-binding activity, with GCN5/SIRT1-reversible Lys371 acetylation controlling promoter recruitment and caspase-2 cleavage at Asp422 disrupting the C-terminal DNA-binding region during cell death.","evidence":"Site-directed mutagenesis, in vitro acetylation/caspase-cleavage assays, ChIP, reporter and cell-death assays","pmids":["35843094","35444189"],"confidence":"Medium","gaps":["Physiological signals driving acetylation/cleavage not defined","Whether modifications co-occur or act independently unclear"]},{"year":2025,"claim":"Revealed a phase-separation-based mechanism in which NONO co-condenses with nuclear GYS1 and MyoD/PIC components to form transcriptional condensates governing myogenic gene expression and metabolism in vivo.","evidence":"Co-IP, FRAP, in vitro phase separation, Nono-knockout mice, C2C12 differentiation and muscle-regeneration models, ChIP","pmids":["40200092"],"confidence":"Medium","gaps":["Single lab; condensate requirement for transcription not genetically dissected","Relationship of GYS1 condensates to paraspeckles unclear"]},{"year":null,"claim":"How NONO's many activities — paraspeckle scaffolding, transcription-splicing coupling, NHEJ, and condensate formation — are coordinately partitioned within a single cell, and how the homodimer/heterodimer choice and PTM code select among them, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No integrated model coupling structural states to functional outcomes","Heterodimer vs. homodimer functional division of labor undefined","Causal link between specific PTMs and each downstream activity in vivo incomplete"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[0,6,10,11,13,26,32,44]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[3,35,39,53]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[3,12,20,31,35]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[9,27,28,45]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[10,13,20,21]}],"localization":[{"term_id":"GO:0005654","term_label":"nucleoplasm","supporting_discovery_ids":[9,15,30]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[9,19,26]},{"term_id":"GO:0005730","term_label":"nucleolus","supporting_discovery_ids":[9]}],"pathway":[{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[6,10,13,18,21,27,28,37]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[3,12,20,31,35]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[14,29,39,57]},{"term_id":"R-HSA-9609507","term_label":"Protein localization","supporting_discovery_ids":[6,26,27,37]}],"complexes":["paraspeckle","SFPQ·NONO (DBHS) complex","NONO/PSF/matrin-3 nuclear-retention complex","snRNP-free U1A (SF-A) polyadenylation complex"],"partners":["SFPQ","PSPC1","MATRIN-3","XRN2","KU","RNA POLYMERASE II CTD","SIN3A","NEAT1"],"other_free_text":[]}},"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; 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genetics","url":"https://pubmed.ncbi.nlm.nih.gov/26060192","citation_count":11,"is_preprint":false},{"pmid":"26561285","id":"PMC_26561285","title":"Furospinosulin-1, Marine Spongean Furanosesterterpene, Suppresses the Growth of Hypoxia-Adapted Cancer Cells by Binding to Transcriptional Regulators p54(nrb) and LEDGF/p75.","date":"2015","source":"Chembiochem : a European journal of chemical biology","url":"https://pubmed.ncbi.nlm.nih.gov/26561285","citation_count":10,"is_preprint":false},{"pmid":"23672612","id":"PMC_23672612","title":"Melanoma inhibitory activity promotes melanoma development through activation of YBX1.","date":"2013","source":"Pigment cell & melanoma research","url":"https://pubmed.ncbi.nlm.nih.gov/23672612","citation_count":10,"is_preprint":false},{"pmid":"24720418","id":"PMC_24720418","title":"Decreased expression of P54(nrb) /NonO correlates with collagen deposition and fibrosis in human aortic 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faster growing ends in the initial activation of Hox gene transcription are nuclear speckles involved?","date":"2013","source":"Transcription","url":"https://pubmed.ncbi.nlm.nih.gov/24406343","citation_count":6,"is_preprint":false},{"pmid":"38843934","id":"PMC_38843934","title":"Nono induces Gadd45b to mediate DNA repair.","date":"2024","source":"Life science alliance","url":"https://pubmed.ncbi.nlm.nih.gov/38843934","citation_count":4,"is_preprint":false},{"pmid":"25619276","id":"PMC_25619276","title":"Dynamical analysis of mCAT2 gene models with CTN-RNA nuclear retention.","date":"2015","source":"Physical biology","url":"https://pubmed.ncbi.nlm.nih.gov/25619276","citation_count":4,"is_preprint":false},{"pmid":"41103024","id":"PMC_41103024","title":"Intranuclear paraspeckle-circular RNA TACC3 assembly forms RNA-DNA hybrids to facilitate MASH-related hepatocellular carcinoma growth in an m6A-dependent manner.","date":"2025","source":"Cancer communications (London, England)","url":"https://pubmed.ncbi.nlm.nih.gov/41103024","citation_count":3,"is_preprint":false},{"pmid":"35843094","id":"PMC_35843094","title":"Reversible acetylation modulates p54nrb/NONO-mediated expression of the interleukin 8 gene.","date":"2022","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/35843094","citation_count":2,"is_preprint":false},{"pmid":"40200092","id":"PMC_40200092","title":"The metabolic enzyme GYS1 condenses with NONO/p54nrb in the nucleus and spatiotemporally regulates glycogenesis and myogenic differentiation.","date":"2025","source":"Cell death and differentiation","url":"https://pubmed.ncbi.nlm.nih.gov/40200092","citation_count":2,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":47389,"output_tokens":14339,"usd":0.178626,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":26503,"output_tokens":5549,"usd":0.13562,"stage2_stop_reason":"end_turn"},"total_usd":0.314246,"stage1_batch_id":"msgbatch_013a8chtv3AWyTqv4z4sEF4C","stage2_batch_id":"msgbatch_01AHsuW63vinsvuTgzmQ3n62","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1993,\n      \"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, and both p54nrb and PSF define a novel conserved protein segment termed the DBHS domain (Drosophila behavior, human splicing), suggesting involvement in pre-mRNA splicing regulation.\",\n      \"method\": \"Protein purification, cDNA cloning, sequence analysis\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct protein purification and cloning with sequence-based functional inference; single lab but foundational characterization\",\n      \"pmids\": [\"8371983\"],\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 via an immobilized protein binding assay. Spi-1/PU.1 impedes the binding of p54nrb to RNA and alters the splicing process in vitro.\",\n      \"method\": \"Immobilized protein binding assay, in vitro splicing assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct biochemical binding assay plus functional in vitro splicing assay; single lab\",\n      \"pmids\": [\"8626664\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"p54nrb (NonO) was found fused to the TFE3 helix-loop-helix transcription factor gene in papillary renal cell carcinoma via an X chromosome inversion inv(X)(p11.2;q12), resulting in fusion of almost the entire splicing factor protein to the TFE3 DNA-binding domain.\",\n      \"method\": \"Cytogenetic and molecular analysis of tumor translocation/inversion\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct genomic characterization of chromosomal rearrangement; single lab\",\n      \"pmids\": [\"9393982\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"p54nrb was shown to bind to the IAP proximal enhancer (IPE) DNA element and to transactivate a reporter gene in HeLa cell extracts. The DNA-binding domain maps to the N-terminal half and the activation domain to the C-terminal half. p54nrb also binds pre-mRNA, demonstrating dual roles in transcription and splicing.\",\n      \"method\": \"Protein purification, reporter gene assay in cell extracts, domain mapping\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro reconstitution-type assays and domain mapping; single lab\",\n      \"pmids\": [\"9001221\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"PSF/p54nrb stimulates DNA topoisomerase I to jump between separate DNA helices without affecting the cleavage or religation half-reactions themselves, suggesting PSF/p54nrb mobilizes topoisomerase I after ligation.\",\n      \"method\": \"In vitro topoisomerase I jumping assay with oligonucleotide substrates\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstituted biochemical assay; single lab, mechanistically specific\",\n      \"pmids\": [\"10858305\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"NonO/p54nrb was found to have carbonic anhydrase (CA) activity. Recombinant NonO generated in baculovirus bound to a CA inhibitor affinity column and revealed detectable CA activity (25 units/mg), identifying it as a nonclassical nuclear carbonic anhydrase.\",\n      \"method\": \"CA inhibitor affinity chromatography, CA activity measurements, recombinant protein expression in baculovirus\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — in vitro enzymatic assay with recombinant protein; single lab, unusual finding not widely replicated\",\n      \"pmids\": [\"10821857\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"A multiprotein complex containing p54nrb, PSF, and matrin 3 binds specifically to inosine-containing (hyperedited) RNAs. This complex anchors hyperedited RNAs to the nuclear matrix, mediating their nuclear retention while allowing selectively edited mRNAs to be exported.\",\n      \"method\": \"HeLa nuclear extract fractionation, RNA affinity chromatography, Co-IP, nuclear matrix fractionation\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — biochemical reconstitution with nuclear extracts, multiple orthogonal methods (affinity purification, co-IP, nuclear matrix fractionation), rigorous controls\",\n      \"pmids\": [\"11525732\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"p54nrb is cleaved/modified during Fas-induced apoptosis, as identified by 2D-gel proteome analysis of apoptotic Jurkat T cells with calculated caspase-3 cleavage sites.\",\n      \"method\": \"2D-PAGE proteomics, MALDI-TOF mass spectrometry, recombinant caspase-3 treatment\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — proteomic identification without direct functional mechanistic follow-up for p54nrb specifically\",\n      \"pmids\": [\"11352910\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"PSF functions as a novel corepressor of nuclear hormone receptors (TR, RXR) by interacting with Sin3A and mediating silencing through recruitment of HDACs to the receptor DNA-binding domain. NonO/p54nrb was co-purified with PSF in this complex on TR and RXR, though p54nrb's independent contribution was not fully separated from PSF's.\",\n      \"method\": \"Biochemical purification, co-immunoprecipitation, reporter gene assay, in vivo studies with TR\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP and reporter assays, multiple receptors tested; primarily PSF-focused but p54nrb co-purified in complex\",\n      \"pmids\": [\"11259580\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"p54nrb localizes to a novel nuclear compartment termed paraspeckles (10–20 per cell), which are discrete bodies in the interchromatin nucleoplasmic space often adjacent to splicing speckles. p54nrb interacts dynamically with nucleoli in a transcription-dependent fashion and relocalizes to nucleolar cap structures when transcription is inhibited.\",\n      \"method\": \"Immunofluorescence, YFP-PSP1 stable cell line live imaging, FRAP, fluorescence microscopy\",\n      \"journal\": \"Current biology : CB\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — live-cell imaging, FRAP, multiple cell lines, transcription inhibition experiments with relocalization readout\",\n      \"pmids\": [\"11790299\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"PSF and p54nrb/NonO bind specifically to the RNA polymerase II CTD (both hypo- and hyperphosphorylated forms) via affinity chromatography and co-immunoprecipitate with pol II holoenzyme. They can simultaneously interact with CTD and RNA, providing a physical link between pol II and pre-mRNA processing.\",\n      \"method\": \"CTD affinity chromatography, co-immunoprecipitation, RNA-binding assay\",\n      \"journal\": \"RNA (New York, N.Y.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP plus affinity chromatography, multiple pol II forms tested, orthogonal RNA-binding assay\",\n      \"pmids\": [\"12358429\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"PSF and p54nrb interact with each other and bind U5 snRNA stem 1b via iterative selection and filter-binding assays. Both proteins associate with spliceosomes and the U4/U6.U5 tri-snRNP.\",\n      \"method\": \"RNA SELEX, filter-binding assay, RNA affinity selection, sedimentation analysis\",\n      \"journal\": \"RNA (New York, N.Y.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro RNA binding assays with structured substrate, sedimentation; single lab\",\n      \"pmids\": [\"12403470\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"p54nrb and PSF form complexes with SF-1 on the CYP17 promoter. The SF-1/PSF/p54nrb/NonO complex is required for cAMP-dependent transcriptional activation of the CYP17 gene. SF-1 co-immunoprecipitates with p54nrb indicating direct interaction. PSF-recruited mSin3A and HDAC activity mediates repression of basal transcription.\",\n      \"method\": \"EMSA, co-immunoprecipitation, luciferase reporter assay, trichostatin A treatment\",\n      \"journal\": \"Endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP, EMSA, and functional reporter assays; single lab\",\n      \"pmids\": [\"11897684\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"p54nrb associates with the 5' splice site within large complexes in HeLa cell nuclear extracts containing hyperphosphorylated RNA pol II (RNAPIIO) together with U1 or U1/U2 snRNPs, P-TEFb, TAT-SF1, TFIIF, PSF, and TLS. p54nrb and PSF can directly interact with the 5' splice site, suggesting they mediate contacts between RNAPII and snRNPs during coupled transcription/splicing.\",\n      \"method\": \"Nuclear extract fractionation, RNA-protein binding assay, immobilized DNA template assay\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional elongation complexes demonstrated with immobilized template; direct 5' SS binding shown; single lab\",\n      \"pmids\": [\"15057275\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"PSF and p54nrb form a stable heteromeric complex that reconstitutes efficient DNA double-strand break rejoining in vitro when added to the other five known NHEJ polypeptides. The PSF·p54nrb complex cooperates with Ku protein to form a functional preligation complex with substrate DNA.\",\n      \"method\": \"In vitro NHEJ reconstitution assay, complex purification\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution of NHEJ with defined components, direct biochemical demonstration of complex formation with Ku\",\n      \"pmids\": [\"15590677\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"p54nrb forms a heterodimer with PSP1 in vivo, and this interaction requires a specific domain within PSP1. The PSP1-p54nrb interaction is necessary but not sufficient for PSP1 paraspeckle targeting, which also requires an RNA-binding-capable RRM. Paraspeckle formation depends on RNA Pol II transcription.\",\n      \"method\": \"Co-immunoprecipitation, domain mapping by truncation mutants, DRB transcription inhibition, fluorescence microscopy\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP, domain mapping, transcription inhibition with reconstitution, live-cell imaging\",\n      \"pmids\": [\"16148043\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"p54nrb is multiphosphorylated during mitosis. CDK1 (identified via roscovitine inhibition and cyclin B1 immunodepletion) phosphorylates the C-terminal extremity of p54nrb. A different kinase phosphorylates the N-terminal region. p54nrb interacts with the peptidylprolyl isomerase Pin1 via three C-terminal threonine residues, with binding favored when at least two are phosphorylated, suggesting regulation by phosphorylation-dependent conformational changes.\",\n      \"method\": \"Phospho-specific antibody staining, CDK inhibitor treatment, immunodepletion, site-directed mutagenesis, Pin1 interaction assay\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — CDK inhibitor, immunodepletion, and mutagenesis all used orthogonally in single study\",\n      \"pmids\": [\"15701524\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"PSF and p54nrb preferentially bind strong transcriptional activation domains and preferentially bind the full-length pol II CTD (52 repeats) rather than a truncated 15-repeat CTD. Elevated PSF expression bypasses the requirement for a strong activator for efficient splicing and 3'-end cleavage. PSF/p54nrb-dependent stimulation of splicing primarily affects first intron removal.\",\n      \"method\": \"Affinity chromatography, transfection/overexpression, reporter assay, CTD truncation mutants\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple functional assays (affinity chromatography, overexpression, CTD truncation); single lab\",\n      \"pmids\": [\"16024807\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"p54nrb is a component of the snRNP-free U1A (SF-A) complex that also contains PSF and p68. Immunodepletion of p54nrb followed by reconstitution experiments showed that p54nrb is critical for pre-mRNA cleavage during polyadenylation.\",\n      \"method\": \"TAP purification, mass spectrometry, immunodepletion, reconstitution, in vitro polyadenylation assay\",\n      \"journal\": \"RNA (New York, N.Y.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — TAP purification, immunodepletion + reconstitution for functional validation; single lab\",\n      \"pmids\": [\"16373496\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Nuclear N-WASP exists in a large nuclear complex containing PSF-NonO/p54nrb, nuclear actin, and RNA polymerase II. The interaction of N-WASP with the PSF-NonO complex couples N-WASP to RNA pol II to regulate transcription. N-WASP-mediated nuclear actin polymerization contributes to this regulation.\",\n      \"method\": \"Co-immunoprecipitation, nuclear complex purification, transcription reporter assay\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP and functional reporter assays with nuclear actin polymerization readout; single lab\",\n      \"pmids\": [\"16767080\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"p54nrb/NonO is required for cAMP-dependent activation of CREB target genes in vivo. TORC2 and NONO complex on cAMP-responsive promoters, and NONO acts as a bridge between the CREB/TORC complex and RNA polymerase II.\",\n      \"method\": \"High-throughput coactivator trap screen, RNAi knockdown, chromatin immunoprecipitation (ChIP)\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RNAi knockdown with defined target gene readout, ChIP for complex on promoter; single lab\",\n      \"pmids\": [\"18077367\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"p54nrb/NonO physically associates with XRN2 via PSF/p54nrb acting as a bridge. p54nrb is present along the length of genes, is required for degradation of the 3'-cleaved RNA downstream of the poly(A) site in vitro, and its siRNA knockdown leads to defects in XRN2 recruitment and transcription termination in vivo.\",\n      \"method\": \"Co-immunoprecipitation, in vitro 3' processing assay, siRNA knockdown, ChIP\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vitro processing assay, siRNA knockdown with in vivo termination readout, ChIP, multiple orthogonal methods\",\n      \"pmids\": [\"17639083\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"PSF and p54nrb bind RNAs containing AU-rich elements (AREs), including the TNFα mRNA. PSF is phosphorylated by Mnk kinases at two sites in vitro and in vivo, and Mnk-mediated phosphorylation increases the binding of PSF to TNFα mRNA in living cells.\",\n      \"method\": \"In vitro kinase assay, mass spectrometry, RNA immunoprecipitation (RIP), cap-resin pulldown\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro kinase assay plus in vivo RIP showing phosphorylation-dependent RNA binding; single lab\",\n      \"pmids\": [\"17965020\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"p54nrb and PSF interact with the two COX-2 upstream sequence elements (USEs). Tethering p54nrb to COX-2 USE mutant RNA compensates for the cis-acting elements in polyadenylation. p54nrb, PTB, PSF, and U1A may interact as a complex since co-immunoprecipitation of MS2 fusion proteins coprecipitates the other partners.\",\n      \"method\": \"RNA pulldown with biotinylated oligonucleotides, MS2 tethering assay, co-immunoprecipitation\",\n      \"journal\": \"RNA (New York, N.Y.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — tethering assay plus co-IP; single lab, multiple orthogonal approaches\",\n      \"pmids\": [\"17507659\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"p54nrb physically interacts with Sox9 and enhances Sox9-dependent transcriptional activation of the Col2a1 promoter. p54nrb colocalizes with Sox9 in nuclear paraspeckle bodies in ATDC5 cells. A p54nrb mutant lacking RNA recognition motifs dominantly inhibits Col2a1 mRNA maturation, chondrocyte differentiation in vitro and in mesenchymal explants, and causes dwarfism in transgenic mice.\",\n      \"method\": \"Co-immunoprecipitation, reporter assay, dominant-negative RRM mutant overexpression, transgenic mouse model, RNA maturation assay\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (co-IP, reporter, dominant-negative, transgenic mouse phenotype), in vitro and in vivo\",\n      \"pmids\": [\"18677406\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"p54nrb binds both BRG1 and Brm (catalytic subunits of the SWI/SNF complex) and the core subunit BAF60a. The N-terminal region of p54nrb is sufficient to pull down other SWI/SNF core subunits. Brm in concert with p54nrb co-localizes at a TERT alternative splicing acceptor site and modulates TERT splicing (promoting exon-inclusion) and transcription.\",\n      \"method\": \"Pulldown assay, co-immunoprecipitation, shRNA knockdown, ChIP, RT-PCR splicing analysis\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pulldown, co-IP, ChIP, and splicing assays; single lab\",\n      \"pmids\": [\"18042045\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"mRNAs containing inverted Alu repeats in their 3'-UTR are retained in the nucleus and associate with p54nrb in a manner that correlates with A-to-I RNA editing. The Nicolin 1 mRNA isoform containing inverted Alu repeats is retained in the nucleus while the isoform lacking these sequences is exported, identifying p54nrb as a component of a gene silencing mechanism mediated by Alu elements.\",\n      \"method\": \"EGFP reporter assay, nuclear/cytoplasmic fractionation, RNA immunoprecipitation\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reporter assay with direct p54nrb co-immunoprecipitation, endogenous gene validation; single lab\",\n      \"pmids\": [\"18497743\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"p54nrb/PSF and PSP1 are expressed in human embryonic stem cells but paraspeckles are absent; paraspeckle assembly requires NEAT1 lncRNA expression, which is absent in hESCs and induced upon differentiation. Knockdown of NEAT1 in HeLa cells results in loss of paraspeckles and enhanced cytoplasmic export of mRNAs containing inverted Alu repeats.\",\n      \"method\": \"siRNA knockdown of NEAT1, immunofluorescence, nuclear/cytoplasmic fractionation, hESC differentiation\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — NEAT1 knockdown with both structural (paraspeckle loss) and functional (mRNA export) readouts, hESC differentiation model\",\n      \"pmids\": [\"19716791\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"p54/nrb and PSF selectively associate with and stabilize the longer MENbeta (NEAT1_2) lncRNA isoform among the two paraspeckle ncRNAs (MENepsilon/MENbeta), contributing to paraspeckle structural organization. Removal of MENepsilon/beta by knockdown results in paraspeckle disintegration.\",\n      \"method\": \"RNA immunoprecipitation, siRNA knockdown, immunofluorescence\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — RNA-IP showing selective isoform binding, functional knockdown with structural readout, replicated findings across two labs (PMID 19716791)\",\n      \"pmids\": [\"19188602\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"p54nrb contributes to rapid and accurate repair of DNA double-strand breaks in vivo. siRNA-mediated p54nrb knockdown delays DSB repair (gamma-H2AX focus assay) and stable miRNA knockdown cell lines show increased ionizing radiation-induced chromosomal aberrations and increased radiosensitivity in clonogenic assay.\",\n      \"method\": \"siRNA/miRNA knockdown, gamma-H2AX focus assay, clonogenic survival assay, chromosomal aberration analysis\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple in vivo DNA repair assays (foci, chromosomal aberrations, survival) with specific knockdown; single lab but three orthogonal readouts\",\n      \"pmids\": [\"19759212\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"p54nrb interacts with hnRNP M via co-immunoprecipitation and pulldown assays, co-localizes with PSF in a subset of nuclear paraspeckles, and co-fractionates with PSF and p54nrb in the nuclear matrix. PSF and hnRNP M have opposing effects on alternative splicing: hnRNP M promotes exon skipping while PSF favors inclusion, and their antagonism requires hnRNP M domains capable of interacting with PSF/p54nrb.\",\n      \"method\": \"Co-immunoprecipitation, pulldown, immunofluorescence, nuclear matrix fractionation, PPT minigene splicing assay\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP and functional splicing assay; single lab\",\n      \"pmids\": [\"19874820\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"p54nrb is a transcriptional corepressor of the progesterone receptor (PR) independent of PSF. p54nrb interacts directly with PR in a ligand-independent manner. p54nrb recruits mSin3A through its N-terminus to the PR-DNA complex, resulting in inhibition of PR-mediated transactivation. Knockdown of p54nrb alleviates PR-mediated repression on connexin 43 (Gja1) transcription.\",\n      \"method\": \"Co-immunoprecipitation, luciferase reporter assay, ChIP, siRNA knockdown, site-directed mutagenesis\",\n      \"journal\": \"Molecular endocrinology (Baltimore, Md.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (co-IP, reporter, ChIP, knockdown) with specific mechanistic placement; single lab\",\n      \"pmids\": [\"19423654\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Mitotic CDK1-mediated phosphorylation of p54nrb reduces its general RNA-binding ability. In vitro CDK1 phosphorylation of GST-p54nrb abolishes interaction with 5' splice site RNA and homoribopolymers poly(A), poly(C), and poly(U) but not poly(G). Threonine 15 (N-terminal to the tandem RRM domains) is required for this inhibition by mutagenesis. Neat1 ncRNA co-immunoprecipitates with p54nrb in both interphase and mitotic cells, indicating that p54nrb-Neat1 interaction is not modulated by phosphorylation.\",\n      \"method\": \"In vitro kinase assay (CDK1), RNA binding assay, site-directed mutagenesis (T15), co-immunoprecipitation, cell synchronization\",\n      \"journal\": \"Biochemistry and cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro kinase assay plus RNA binding with mutagenesis validation; single lab with multiple orthogonal assays\",\n      \"pmids\": [\"21819346\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"PP1 forms a protein complex with p54nrb and PSF, interacting directly with p54nrb via its RVxF motif. PP1 association results in dephosphorylation of p54nrb and PSF, leading to loss of their transcriptional corepressor activities and altered alternative splicing activities (shifting from exon inclusion to exon skipping). Dephosphorylation changes p54nrb/PSF interactions with Sin3A, HDAC1, U1A and U2AF.\",\n      \"method\": \"Co-immunoprecipitation, RVxF motif mutagenesis, luciferase reporter assay, CD44 minigene splicing assay, in vivo phosphorylation analysis\",\n      \"journal\": \"Molecular endocrinology (Baltimore, Md.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP with motif mutagenesis and multiple functional readouts (reporter, splicing, partner interactions); single lab\",\n      \"pmids\": [\"21566083\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"p54nrb forms a complex with ILF3 that binds to the survivin promoter to regulate survivin expression. The small molecule YM155 binds ILF3 and disrupts the ILF3/p54nrb complex, resulting in different subcellular localization of the two proteins and suppression of survivin expression.\",\n      \"method\": \"Co-immunoprecipitation, ChIP, immunofluorescence localization, YM155 treatment\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — co-IP and ChIP with pharmacological disruption; single lab\",\n      \"pmids\": [\"22842455\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"NonO/p54nrb binds to the rhodopsin distal enhancer region (RER) as validated by ChIP-seq showing high NonO occupancy at rhodopsin and phototransduction genes. NonO and its interactors (hnRNP M, Ywhaz, Ppp1ca) activate the rhodopsin promoter in HEK293 cells synergistically with NRL and CRX; the DNA-binding domain of NonO is critical. shRNA knockdown of NonO in mouse retina leads to loss of rhodopsin expression, rod cell death, splicing defects, and altered expression of phototransduction genes.\",\n      \"method\": \"Mass spectrometry identification, co-immunoprecipitation, ChIP-seq, luciferase reporter assay, shRNA knockdown in retina, RNA-seq\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP-seq, in vivo shRNA with multiple phenotypic readouts, promoter domain deletion mapping; single lab but multiple orthogonal methods\",\n      \"pmids\": [\"24301678\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"During apoptosis induced by TRAIL, PTB forms a remodeled complex with PSF and NONO/p54nrb among others. Increased expression of NONO/p54nrb accelerates apoptosis. These proteins post-transcriptionally regulate apoptosis rates by interacting with and stimulating IRES activity in mRNAs translated during apoptosis.\",\n      \"method\": \"Co-immunoprecipitation, overexpression/knockdown with apoptosis rate measurement, IRES reporter assay\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP plus functional IRES reporter and apoptosis rate assay; single lab\",\n      \"pmids\": [\"24141718\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"p54nrb/NonO and PSF promote U snRNA nuclear export by accelerating assembly of the U snRNA export complex. As a heterodimer, they accelerate the recruitment of PHAX, and subsequently CRM1 and Ran, onto RNA substrates in vitro, mediating efficient U snRNA export in vivo.\",\n      \"method\": \"In vitro U snRNA export complex assembly assay, microinjection/in vivo export assay\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution of export complex assembly plus in vivo validation; single lab\",\n      \"pmids\": [\"24413662\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"CARM1 (coactivator-associated arginine methyltransferase 1) methylates the coiled-coil domain of p54nrb, resulting in reduced binding of p54nrb to mRNAs containing inverted Alu repeats (IRAlus). CARM1 also suppresses NEAT1 transcription to reduce paraspeckle formation. Both mechanisms together promote nuclear export of IRAlu-containing mRNAs, especially under poly(I:C) stress.\",\n      \"method\": \"Co-immunoprecipitation, in vitro methylation assay, RNA immunoprecipitation, NEAT1 knockdown, poly(I:C) treatment, nuclear/cytoplasmic fractionation\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro methylation assay identifying specific domain target, RIP showing functional consequence, multiple orthogonal approaches\",\n      \"pmids\": [\"25792598\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"The SFPQ·NONO native complex purified from HeLa cells binds DNA independently of free ends (unlike Ku), has DNA pairing activity in a microwell assay, and stimulates DNA-dependent protein kinase (DNA-PKcs) autophosphorylation. These findings suggest SFPQ·NONO promotes end joining by binding internal DNA sequences and stabilizing a synaptic pre-ligation complex without occluding DNA termini.\",\n      \"method\": \"Native complex purification from HeLa cells, microwell-based DNA binding/pairing assay, DNA-PK autophosphorylation assay\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro biochemical assays with purified native complex, multiple assay types; single lab\",\n      \"pmids\": [\"25998385\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"p54nrb/NONO binds the nuclear form of SREBP-1a, and the conserved Y267 residue of p54nrb is required for this interaction. p54nrb binding to nuclear SREBP-1a increases its protein stability, stimulating SREBP-1-mediated transcription of lipogenic genes and lipid production in breast cancer cells.\",\n      \"method\": \"Co-immunoprecipitation, site-directed mutagenesis (Y267), reporter assay, in vitro and in vivo tumor growth assays\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP plus mutagenesis with functional reporter and in vivo tumor readout; single lab\",\n      \"pmids\": [\"26148231\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"p54nrb/NONO regulates glucocorticoid production by modulating the splicing of multiple phosphodiesterase (PDE) isoforms and facilitating the interaction between XRN2 and select PDE transcripts to regulate their stability. Silencing p54nrb in H295R adrenocortical cells decreases cAMP production and cortisol biosynthesis in response to ACTH.\",\n      \"method\": \"siRNA knockdown, RT-PCR splicing analysis, RNA stability assay, co-immunoprecipitation\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA knockdown with defined splicing and mRNA stability readouts, co-IP; single lab\",\n      \"pmids\": [\"25605330\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"p54nrb/NONO transcriptionally regulates the lncRNA PCGEM1 by binding its promoter in response to androgen deprivation. Suppression of p54nrb reduces PCGEM1, and re-expression restores it. DIM (3,3'-diindolylmethane) suppresses PCGEM1 by preventing the interaction of p54nrb with the PCGEM1 promoter.\",\n      \"method\": \"siRNA/CRISPR KO, rescue experiments, ChIP showing p54nrb on PCGEM1 promoter\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP, KO with rescue, pharmacological disruption; single lab\",\n      \"pmids\": [\"27682980\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Progesterone-liganded nuclear PRB forms a complex including JUN/JUN homodimers and P54nrb/Sin3A/HDAC to repress transcription of the labor gene Cx43. Unliganded PRA paradoxically activates Cx43 transcription. Increased 20α-HSD expression reduces nuclear progesterone levels during labor, switching PR from liganded to unliganded state.\",\n      \"method\": \"Co-immunoprecipitation, ChIP, reporter assay, siRNA knockdown, immunofluorescence\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP and ChIP with functional reporter data; single lab\",\n      \"pmids\": [\"27220952\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"The structure of p54nrb/NonO RRM1 was determined by NMR, revealing a canonical fold (β1α1β2β3α2β4) with conserved aromatic amino acids. Only RRM1 (not RRM2) binds to 5' splice site RNA. The binding interface was mapped by NMR and the affinity was determined by fluorescence quenching. Phosphorylation of T15 (N-terminal to RRM1) inhibits RNA binding except for G-rich RNAs.\",\n      \"method\": \"NMR structure determination, fluorescence quenching binding assay, in vitro RNA binding\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — NMR structure with binding interface mapping and quantitative affinity measurement; single lab but high method quality\",\n      \"pmids\": [\"27064654\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Crystal structure of NONO homodimer was obtained at 2.6 Å resolution by molecular replacement. NONO crystallizes as a superhelical arrangement of six NONO homodimers, establishing that NONO is an obligatory homodimer. L-proline stabilizes purified NONO homodimers and prevents aggregation.\",\n      \"method\": \"X-ray crystallography, SAXS\",\n      \"journal\": \"Acta crystallographica. Section D, Structural biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — X-ray crystallography at 2.6 Å with molecular replacement; structural determination of homodimeric architecture\",\n      \"pmids\": [\"27303796\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Tyrosine residues of p54nrb are not phosphorylated (p54nrb shows non-specific binding to anti-phosphotyrosine antibodies). However, replacement of tyrosine residues with phenylalanine altered p54nrb activities in transcriptional co-repression and RNA splicing in a gene context-dependent manner by differentially regulating p54nrb protein associations with interacting partners.\",\n      \"method\": \"Site-directed mutagenesis (Y-to-F substitutions), luciferase reporter assay, minigene splicing assay, co-immunoprecipitation, confocal microscopy\",\n      \"journal\": \"Journal of cellular physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — comprehensive mutagenesis with multiple functional assays; single lab\",\n      \"pmids\": [\"27430900\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"NEAT1 depletion releases sequestered P54nrb and PSF from paraspeckles to facilitate IRES-dependent translation of c-Myc mRNA. Increased association of P54nrb and PSF with c-Myc mRNA was observed in NEAT1-depleted cells under RNAP I inhibition (CX5461 treatment).\",\n      \"method\": \"Antisense oligonucleotide-mediated NEAT1 knockdown, RNA immunoprecipitation (RIP), immunofluorescence\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RIP showing p54nrb-mRNA association change upon NEAT1 knockdown; single lab\",\n      \"pmids\": [\"28288210\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"CARM1 accumulates in nuclear granules (mostly paraspeckles) at the 2- to 4-cell stage of mouse embryo development. The paraspeckle component NEAT1 and its partner p54nrb are required for CARM1's association with paraspeckles and for H3R26 methylation. Conversely, CARM1 influences paraspeckle organization. Depletion of p54nrb results in arrest at the 16- to 32-cell stage with elevated Cdx2, indicating that paraspeckles (with p54nrb as a component) act upstream of CARM1 in early embryo cell fate determination.\",\n      \"method\": \"Immunofluorescence in mouse embryos, p54nrb depletion (siRNA/morpholino), H3R26 methylation analysis, developmental arrest assay\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo depletion in mouse embryos with H3R26 methylation readout and lineage fate phenotype; multiple orthogonal approaches\",\n      \"pmids\": [\"30550788\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"P54nrb interacts with RNase H1 via its core domains; toxic phosphorothioate antisense oligonucleotides (PS-ASOs) form a complex that includes RNase H1, P54nrb, and PSF (but safe PS-ASOs do not). P54nrb RRM1 and RRM2 are required for PS-ASO binding. The protein-protein interaction between P54nrb and RNase H1 requires the spacer region of RNase H1. RNA is also a required component of this complex.\",\n      \"method\": \"NanoLuciferase structural complementation reporter (real-time in live cells), in vitro binding assay, domain deletion analysis\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — live-cell real-time protein interaction reporter plus in vitro binding with domain mapping; single lab\",\n      \"pmids\": [\"31495875\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"NONO promotes BIN1 exon 12a inclusion (oncogenic splicing switch) through interaction with DHX9 and SFPQ forming a DHX9-NONO-SFPQ complex. Knockdown of NONO abolishes liver cancer cell proliferation, migration, and BIN1-L expression, while BIN1-L stabilizes PLK1 by preventing cullin 3-mediated ubiquitination.\",\n      \"method\": \"RNA-seq, co-immunoprecipitation, siRNA knockdown, minigene splicing assay, tumor formation assay\",\n      \"journal\": \"Hepatology (Baltimore, Md.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP showing ternary complex, RNA-seq splicing analysis with siRNA validation; single lab\",\n      \"pmids\": [\"31815296\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"SFPQ, in complex with p54nrb, binds and regulates the activity of splicing factor SRSF2 under platinum treatment. The SFPQ/p54nrb complex decreases SRSF2 binding to caspase-9 RNA, favoring expression of the antiapoptotic caspase-9b isoform and contributing to chemoresistance.\",\n      \"method\": \"Co-immunoprecipitation, RNA immunoprecipitation, siRNA knockdown, alternative splicing analysis\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP and RIP showing mechanistic link between SFPQ/NONO complex, SRSF2, and caspase-9 splicing; single lab\",\n      \"pmids\": [\"32332923\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"NONO interacted with and stabilized both HIF-1α and HIF-2α complexes, activating transcription of hypoxia-induced genes. NONO also bound pre-mRNA and mature mRNA of HIF-1/2 targets to facilitate splicing and mRNA stability. NONO knockout disrupted expression of HIF-1/2 targets and impeded hypoxia-enhanced progression in hepatocellular carcinoma.\",\n      \"method\": \"Co-immunoprecipitation, RNA immunoprecipitation, NONO knockout, in vitro/in vivo tumor assays, ChIP\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP and RIP with KO validation; multiple readouts but single lab\",\n      \"pmids\": [\"34079086\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"p54nrb is a substrate of caspase-2, which cleaves p54nrb at D422, disrupting its C-terminal DNA-binding region. Loss or cleavage of p54nrb results in altered expression of oncogenic genes including cathepsin-Z and gelsolin. p54nrb interacts with cathepsin-Z and gelsolin DNA (but not RNA). Loss of p54nrb increases cell death susceptibility in tumor cell lines.\",\n      \"method\": \"In vitro caspase-2 cleavage assay, quantitative proteomics, ChIP (DNA interaction), siRNA/CRISPR knockdown/KO, cell death assay\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro caspase cleavage assay identifying cleavage site, ChIP for DNA interaction, loss-of-function with multiple tumor cell lines\",\n      \"pmids\": [\"35444189\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Lysine 371 of p54nrb is reversibly acetylated: acetyltransferase GCN5 acetylates K371, and deacetylase SIRT1 removes the modification. GCN5-mediated acetylation attenuates recruitment of p54nrb to its core binding motif within the IL-8 gene promoter, increasing IL-8 expression; SIRT1-mediated deacetylation reverses this.\",\n      \"method\": \"Site-directed mutagenesis (K371), co-immunoprecipitation, ChIP, luciferase reporter assay, in vitro acetylation assay\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — site-directed mutagenesis plus ChIP and in vitro acetylation; single lab\",\n      \"pmids\": [\"35843094\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"p54nrb/NONO significantly interacted with nuclear EGFR in triple-negative breast cancer. NONO increased the stability of nuclear EGFR and recruited CBP/p300, enhancing EGFR transcriptional activity. In turn, EGFR positively regulated NONO's affinity to mRNAs of EGFR downstream genes.\",\n      \"method\": \"Co-immunoprecipitation, proximity ligation assay, siRNA knockdown, reporter assay, protein stability assay\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP and stability assay; single lab with multiple approaches\",\n      \"pmids\": [\"35013116\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Paraspeckle proteins p54nrb and PSPC1 function as IRES trans-acting factors (ITAFs) for subgroups of (lymph)angiogenic and cardioprotective factor mRNAs during hypoxia. NEAT1 and IRES-containing mRNAs are recruited into paraspeckles during hypoxia. Paraspeckles act as a platform for IRESome assembly and IRES-dependent translation.\",\n      \"method\": \"siRNA knockdown, polysome profiling, smiFISH for mRNA localization, mass spectrometry, IRES reporter assay\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (knockdown, smiFISH, proteomics, IRES reporter); single lab\",\n      \"pmids\": [\"36546462\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Nono deletion in murine KP lung cancer cells impairs the DNA damage response to etoposide and bleomycin, with hyperactivation of DSB signaling, reduced RNA pol II promoter occupancy, impaired nascent RNA synthesis, and attenuated induction of Gadd45b. Gadd45b is identified as a putative Nono-dependent effector of the DDR, indicating Nono mediates a genome-protective crosstalk between the DDR and RNA metabolism.\",\n      \"method\": \"CRISPR/Cas9 Nono deletion, gamma-H2AX assay, Pol II ChIP, nascent RNA synthesis assay, RT-PCR/Western blot for Gadd45b\",\n      \"journal\": \"Life science alliance\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO with multiple mechanistic readouts; single lab, identifying Gadd45b as downstream effector\",\n      \"pmids\": [\"38843934\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"GYS1 (glycogen synthase 1) complexes with NONO/p54nrb in the nucleus and undergoes liquid-liquid phase separation with NONO to form nuclear condensates, leading to GYS1 nuclear retention and inhibition of glycogen biosynthesis. NONO and nGYS1 co-condense with MyoD and preinitiation complex (PIC) proteins to form transcriptional condensates, driving myogenic gene expression. Nono-deficient mice exhibit exercise intolerance, higher muscle glycogen content, smaller myofibers, and impaired muscle regeneration.\",\n      \"method\": \"Co-immunoprecipitation, FRAP, in vitro phase separation assay, Nono knockout mice, C2C12 differentiation assay, cardiotoxin muscle regeneration model, ChIP\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP and phase separation assays with in vivo KO mouse validation; single lab\",\n      \"pmids\": [\"40200092\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"NONO/p54nrb is an obligatory homodimeric (or PSF-heterodimeric) DBHS-family nuclear scaffold protein that functions at multiple steps of gene regulation: it binds the RNA pol II CTD and 5' splice sites to couple transcription with pre-mRNA splicing; retains hyperedited (inosine-containing) mRNAs in the nucleus via a matrin 3/PSF complex anchored to the nuclear matrix; is an essential structural component of paraspeckles (dependent on NEAT1 lncRNA), where it sequesters IRAlu-containing mRNAs for regulated export; acts as a corepressor of nuclear hormone receptors (PR, AR, TR/RXR) by recruiting Sin3A/HDAC complexes; serves as a coactivator for SF-1-dependent and CREB/TORC-dependent transcription; recruits XRN2 to facilitate RNA pol II transcription termination; participates in non-homologous end joining by forming a pre-ligation synaptic complex with Ku protein; and undergoes post-translational modifications (CDK1 phosphorylation of T15 reducing RNA binding during mitosis; CARM1 methylation of the coiled-coil domain reducing IRAlu-mRNA binding; GCN5 acetylation of K371 modulating promoter binding; caspase-2 cleavage at D422 disrupting its C-terminal DNA-binding region) that regulate its diverse activities.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"NONO (p54nrb) is a DBHS-family nuclear RNA/DNA-binding protein that couples transcription to RNA processing and serves as a multifunctional gene-regulatory scaffold [#0, #10]. Defined by tandem RNA recognition motifs and a DBHS segment shared with the splicing factor PSF/SFPQ, it functions as an obligatory homodimer or as a PSF/SFPQ heterodimer, with crystallographic and NMR analyses establishing the homodimeric architecture and showing that RRM1 alone engages 5' splice-site RNA [#44, #45]. NONO physically binds the RNA polymerase II CTD (both phosphoforms) and 5' splice sites within elongation-competent complexes containing snRNPs and elongation factors, providing a physical bridge between transcription and pre-mRNA splicing, 3'-end cleavage/polyadenylation, and termination, the last through recruitment of the exonuclease XRN2 [#10, #13, #18, #21]. It is an essential structural component of paraspeckles, nuclear bodies whose assembly depends on the NEAT1 (MEN\\u03b5/\\u03b2) lncRNA that NONO binds and stabilizes; within these bodies and an associated matrin-3/PSF complex, NONO retains inosine-hyperedited and inverted-Alu (IRAlu)-containing mRNAs at the nuclear matrix to control their export [#6, #9, #26, #27, #28]. NONO additionally acts as a sequence-specific DNA-binding transcriptional regulator: it represses nuclear hormone receptors such as the progesterone receptor by recruiting Sin3A/HDAC, and coactivates SF-1- and CREB/TORC-dependent transcription by bridging activators to pol II [#31, #12, #20]. In genome maintenance it forms, as an SFPQ\\u00b7NONO complex, a Ku-cooperating synaptic pre-ligation complex that reconstitutes non-homologous end joining and is required for efficient double-strand-break repair in cells [#14, #39, #29]. Its diverse activities are gated by post-translational modification, including mitotic CDK1 phosphorylation of Thr15 that suppresses RNA binding, CARM1 methylation of the coiled-coil that reduces IRAlu-mRNA binding, GCN5/SIRT1-reversible acetylation of Lys371 controlling promoter occupancy, and caspase-2 cleavage at Asp422 that disrupts its C-terminal DNA-binding region [#32, #38, #54, #53].\",\n  \"teleology\": [\n    {\n      \"year\": 1993,\n      \"claim\": \"Established NONO's molecular identity, defining it as a tandem-RRM protein closely related to PSF within a conserved DBHS segment, predicting a role in pre-mRNA splicing.\",\n      \"evidence\": \"Protein purification, cDNA cloning and sequence analysis from HeLa cells\",\n      \"pmids\": [\"8371983\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional role inferred from homology, not yet demonstrated\", \"No partner or substrate identified\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Demonstrated NONO has dual transcription and splicing activities by mapping a separable N-terminal DNA-binding domain and C-terminal activation domain on a defined enhancer element.\",\n      \"evidence\": \"Protein purification, reporter gene assay in cell extracts, domain mapping\",\n      \"pmids\": [\"9001221\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vitro/extract-based; physiological promoter targets unclear\", \"Disease relevance of the TFE3 fusion not mechanistically resolved\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Provided the physical basis for transcription-splicing coupling by showing NONO/PSF bind the pol II CTD and snRNAs while simultaneously contacting RNA, and identified paraspeckles as a NONO-resident nuclear compartment.\",\n      \"evidence\": \"CTD affinity chromatography and co-IP with pol II holoenzyme; RNA SELEX/filter binding to U5 snRNA; live-cell imaging and FRAP\",\n      \"pmids\": [\"12358429\", \"12403470\", \"11790299\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether CTD binding is direct or complex-mediated not fully resolved\", \"Paraspeckle function not yet defined at this stage\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Defined a nuclear-retention function: a NONO/PSF/matrin-3 complex anchors hyperedited inosine-containing RNAs to the nuclear matrix to gate their export.\",\n      \"evidence\": \"Nuclear extract fractionation, RNA affinity chromatography, co-IP, nuclear matrix fractionation\",\n      \"pmids\": [\"11525732\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"NONO's specific contribution within the trimeric complex not isolated\", \"Selectivity for edited vs. unedited transcripts mechanism incomplete\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Extended NONO beyond RNA metabolism into genome maintenance by showing the PSF\\u00b7p54nrb heterodimer reconstitutes NHEJ and cooperates with Ku in a pre-ligation complex.\",\n      \"evidence\": \"In vitro NHEJ reconstitution with defined components and complex purification\",\n      \"pmids\": [\"15590677\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo requirement not yet shown at this stage\", \"Mechanism of synapsis vs. ligase stimulation not separated\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Anchored paraspeckle assembly to a specific lncRNA, showing NEAT1 is required for paraspeckle formation and that NONO selectively binds/stabilizes the NEAT1_2 isoform, linking the body to IRAlu-mRNA retention.\",\n      \"evidence\": \"NEAT1 siRNA/ASO knockdown, RNA-IP, immunofluorescence, hESC differentiation, nuclear/cytoplasmic fractionation\",\n      \"pmids\": [\"19716791\", \"19188602\", \"18497743\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry of NONO on NEAT1 not defined\", \"How editing status is sensed to select retained transcripts unresolved\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Established NONO as a PSF-independent transcriptional corepressor of nuclear hormone receptors, directly binding the progesterone receptor and recruiting mSin3A to silence target genes.\",\n      \"evidence\": \"Co-IP, luciferase reporter, ChIP, siRNA knockdown, mutagenesis\",\n      \"pmids\": [\"19423654\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Breadth of receptor targets beyond PR not mapped\", \"Switch between corepressor and coactivator modes not defined\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Confirmed an in vivo genome-protective role by showing NONO depletion delays DSB repair and increases radiosensitivity and chromosomal aberrations.\",\n      \"evidence\": \"siRNA/miRNA knockdown, gamma-H2AX foci, clonogenic survival, chromosomal aberration analysis\",\n      \"pmids\": [\"19759212\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Repair pathway choice (NHEJ vs. other) in cells not delineated\", \"Relationship to its RNA functions in repair unclear\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Mechanistically connected NONO to transcription termination and 3'-end metabolism, showing it bridges XRN2 to genes and is required for downstream-RNA degradation and termination.\",\n      \"evidence\": \"Co-IP, in vitro 3' processing assay, siRNA knockdown, ChIP\",\n      \"pmids\": [\"17639083\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct vs. PSF-mediated XRN2 contact not separated\", \"Genome-wide scope of termination defects not assessed\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Provided structural definition of the dimer and RNA-binding module, establishing NONO as an obligate homodimer and identifying RRM1 as the 5' splice-site-binding domain regulated by Thr15 phosphorylation.\",\n      \"evidence\": \"X-ray crystallography (2.6 \\u00c5) and SAXS of the homodimer; NMR of RRM1 with fluorescence-quenching affinity measurement\",\n      \"pmids\": [\"27303796\", \"27064654\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structure of full-length protein with RNA not solved\", \"Heterodimer (with PSF) interface not crystallized here\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Showed that arginine methylation gates the nuclear-retention function, with CARM1 methylating the coiled-coil to reduce IRAlu-mRNA binding and suppress NEAT1, promoting export under stress.\",\n      \"evidence\": \"In vitro methylation assay, co-IP, RNA-IP, NEAT1 knockdown, poly(I:C) treatment, fractionation\",\n      \"pmids\": [\"25792598\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Site-resolution of methylated residues incomplete\", \"Stress-signal-to-CARM1 link not defined\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Defined cell-cycle and phosphatase control of NONO activity: CDK1 phosphorylation of Thr15 abolishes RNA binding during mitosis while PP1 dephosphorylation reprograms its corepressor and splicing functions.\",\n      \"evidence\": \"In vitro CDK1 kinase and RNA-binding assays with T15 mutagenesis; PP1 co-IP with RVxF mutagenesis and splicing/reporter assays\",\n      \"pmids\": [\"21819346\", \"21566083\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the N-terminal-region kinase not established\", \"How NEAT1 binding escapes phospho-regulation not explained\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Placed NONO/paraspeckles upstream of CARM1 and chromatin marking in early development, showing p54nrb is required for CARM1 paraspeckle association, H3R26 methylation, and proper cell-fate determination.\",\n      \"evidence\": \"Immunofluorescence in mouse embryos, p54nrb depletion, H3R26 methylation analysis, developmental-arrest phenotype\",\n      \"pmids\": [\"30550788\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct vs. paraspeckle-structural role in CARM1 recruitment unresolved\", \"Target genes governing the Cdx2 phenotype not fully mapped\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Demonstrated tissue-specific transcriptional and splicing control by NONO at a defined locus, showing it occupies the rhodopsin enhancer with NRL/CRX and is required for rod survival in vivo.\",\n      \"evidence\": \"ChIP-seq, co-IP, reporter assay, shRNA knockdown in mouse retina, RNA-seq\",\n      \"pmids\": [\"24301678\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Generality of enhancer occupancy across cell types not addressed\", \"Coupling of its transcription vs. splicing roles at the locus not separated\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Identified additional PTM-based gating of DNA-binding activity, with GCN5/SIRT1-reversible Lys371 acetylation controlling promoter recruitment and caspase-2 cleavage at Asp422 disrupting the C-terminal DNA-binding region during cell death.\",\n      \"evidence\": \"Site-directed mutagenesis, in vitro acetylation/caspase-cleavage assays, ChIP, reporter and cell-death assays\",\n      \"pmids\": [\"35843094\", \"35444189\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Physiological signals driving acetylation/cleavage not defined\", \"Whether modifications co-occur or act independently unclear\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Revealed a phase-separation-based mechanism in which NONO co-condenses with nuclear GYS1 and MyoD/PIC components to form transcriptional condensates governing myogenic gene expression and metabolism in vivo.\",\n      \"evidence\": \"Co-IP, FRAP, in vitro phase separation, Nono-knockout mice, C2C12 differentiation and muscle-regeneration models, ChIP\",\n      \"pmids\": [\"40200092\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab; condensate requirement for transcription not genetically dissected\", \"Relationship of GYS1 condensates to paraspeckles unclear\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How NONO's many activities — paraspeckle scaffolding, transcription-splicing coupling, NHEJ, and condensate formation — are coordinately partitioned within a single cell, and how the homodimer/heterodimer choice and PTM code select among them, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No integrated model coupling structural states to functional outcomes\", \"Heterodimer vs. homodimer functional division of labor undefined\", \"Causal link between specific PTMs and each downstream activity in vivo incomplete\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [0, 6, 10, 11, 13, 26, 32, 44]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [3, 35, 39, 53]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [3, 12, 20, 31, 35]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [9, 27, 28, 45]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [10, 13, 20, 21]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005654\", \"supporting_discovery_ids\": [9, 15, 30]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [9, 19, 26]},\n      {\"term_id\": \"GO:0005730\", \"supporting_discovery_ids\": [9]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [6, 10, 13, 18, 21, 27, 28, 37]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [3, 12, 20, 31, 35]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [14, 29, 39, 57]},\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [6, 26, 27, 37]}\n    ],\n    \"complexes\": [\n      \"paraspeckle\",\n      \"SFPQ\\u00b7NONO (DBHS) complex\",\n      \"NONO/PSF/matrin-3 nuclear-retention complex\",\n      \"snRNP-free U1A (SF-A) polyadenylation complex\"\n    ],\n    \"partners\": [\n      \"SFPQ\",\n      \"PSPC1\",\n      \"matrin-3\",\n      \"XRN2\",\n      \"Ku\",\n      \"RNA polymerase II CTD\",\n      \"Sin3A\",\n      \"NEAT1\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}