{"gene":"HNRNPA1","run_date":"2026-06-10T01:55:22","timeline":{"discoveries":[{"year":1994,"finding":"hnRNP A1 is a sequence-specific RNA-binding protein; its consensus high-affinity binding site is UAGGGA/U, determined by SELEX from random RNA pools. Both RNA-binding domains (RBDs) act as a single composite to confer specificity, and the highest-affinity winner sequence (containing a duplication separated by two nucleotides) binds with Kd ~1 nM. Oligonucleotides containing this site are potent inhibitors of in vitro pre-mRNA splicing.","method":"SELEX/selection-amplification from random RNA pools; UV crosslinking; in vitro splicing inhibition assay","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with quantitative binding measurements and functional splicing assay, rigorous controls","pmids":["7510636"],"is_preprint":false},{"year":1994,"finding":"hnRNP A1 antagonizes SR proteins (SF2/ASF, SC35) to activate distal 5' splice sites. Two conserved Phe residues in the RNP-1 submotif of each RBD are essential for modulating alternative splicing (but not general pre-mRNA binding). The C-terminal Gly-rich domain is necessary for alternative splicing activity, stable RNA binding, and RNA annealing activity.","method":"Mutagenesis of recombinant hnRNP A1; in vitro splicing assays; RNA-binding assays","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstitution with mutagenesis and functional splicing assays","pmids":["7957114"],"is_preprint":false},{"year":1995,"finding":"A ~40 amino acid segment near the C-terminus of hnRNP A1, designated M9, is necessary and sufficient for nuclear localization. Fusion of M9 to cytoplasmic proteins (β-galactosidase, pyruvate kinase) redirected them to the nucleus. M9 is a novel NLS type distinct from classical basic-type NLS; the RBDs and RGG box are not required for nuclear localization.","method":"Domain deletion/fusion constructs; subcellular localization by microscopy in cultured cells","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — necessity and sufficiency tested with multiple fusion constructs, replicated across cell types","pmids":["7730395"],"is_preprint":false},{"year":1996,"finding":"hnRNP A1 selectively interacts with itself and other hnRNP core proteins (and some SR proteins) through its C-terminal Gly-rich domain. This domain is necessary and sufficient for both in vitro binding and in vivo interaction as tested by yeast two-hybrid assay; a novel hydrophobic-repeat protein-binding motif within the Gly-rich domain mediates these interactions.","method":"In vitro pulldown; yeast two-hybrid assay","journal":"Journal of molecular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal in vitro and in vivo (yeast two-hybrid) methods, single lab","pmids":["8676373"],"is_preprint":false},{"year":1998,"finding":"hnRNP A1 participates in telomere biogenesis in mammals. A1-deficient mouse cells have shorter telomeres; restoring A1 expression increases telomere length. UP1 (N-terminal fragment of A1) binds single-stranded vertebrate telomeric repeats directly and specifically in vitro, and can recover telomerase activity from cell lysate, implying A1/UP1 modulates telomere length via interaction with telomerase.","method":"A1-deficient mouse cell line analysis; telomere length assay; in vitro DNA binding; telomerase recovery from lysate","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — loss-of-function cell line with rescue, in vitro binding, and functional telomerase assay","pmids":["9620782"],"is_preprint":false},{"year":2001,"finding":"hnRNP A1 inhibits HIV-1 tat intron splicing via a novel intronic splicing silencer (ISS) that overlaps with alternative branch point sequences, blocking U2 snRNP association (but at a step after U2AF binding). Recombinant hnRNP A1 added to depleted nuclear extracts restores splicing inhibition; hnRNP A1 interacts specifically with the ISS sequence.","method":"hnRNP A1 depletion/reconstitution of nuclear extracts; in vitro splicing assays; RNA-protein binding assays","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstitution with purified components, depletion/add-back, mechanistic step defined","pmids":["11598017"],"is_preprint":false},{"year":2001,"finding":"Nuclear accumulation of hnRNP A1 is transcription-dependent: in transcriptionally inactive embryos it equilibrates passively between nucleus and cytoplasm, but in transcriptionally active embryos it concentrates in the nucleus via carrier-mediated (transportin-dependent) import. The presence of nascent transcripts in the nucleus (not cytoplasmic RNA) is the critical event driving nuclear concentration.","method":"Live imaging and microinjection in mouse embryos; transcription inhibition; nuclear transplantation; wheat germ agglutinin nuclear pore blockade","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct localization experiments in embryos with functional perturbations and nuclear transplantation","pmids":["11282028"],"is_preprint":false},{"year":2002,"finding":"The nucleocytoplasmic shuttling activity of hnRNP A1 is required for normal myelopoiesis and BCR/ABL leukemogenesis. BCR/ABL stabilizes hnRNP A1 by preventing its ubiquitin/proteasome-dependent degradation. A nuclear-export-defective mutant suppresses granulocytic differentiation, enhances apoptosis, and reduces BCR/ABL-dependent colony formation, with downstream loss of C/EBPα and Bcl-XL mRNAs.","method":"Expression of export-defective mutant in cell lines and primary cells; colony formation; differentiation assays; BCR/ABL transformation model","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — dominant-negative mutant with multiple phenotypic readouts, single lab","pmids":["11884611"],"is_preprint":false},{"year":2003,"finding":"hnRNP A1 and hnRNP A/B interact with PABPN1, and co-localize with mutant PABPN1 in intranuclear aggregates in OPMD; hnRNP A1 is sequestered in OPMD patient muscle inclusions, supporting the idea that inclusions act as 'poly(A) RNA traps' interfering with RNA export.","method":"Yeast two-hybrid screen; GST pulldown; co-immunoprecipitation; co-localization in cellular OPMD model and patient tissue","journal":"The Canadian journal of neurological sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal binding methods (Y2H + Co-IP + pulldown) plus patient tissue; single lab","pmids":["12945950"],"is_preprint":false},{"year":2003,"finding":"hnRNP A1 binds a downstream intronic silencer (rasISS1) and inhibits c-H-ras IDX exon splicing. Depletion and add-back experiments in nuclear extracts confirm the inhibitory role; SR proteins SC35 and SRp40 counteract this inhibition.","method":"Depletion/add-back in nuclear extracts; in vitro splicing assays; RNA-protein binding","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstitution with depletion/add-back in nuclear extracts, mechanistic rescue demonstrated","pmids":["12665590"],"is_preprint":false},{"year":2003,"finding":"hnRNP A1 binds the 5' half of c-src exon N1 (identified by UV crosslinking and immunoprecipitation) and represses N1 splicing in vitro via a mechanism distinct from PTB-mediated repression and independent of PTB binding sites upstream of N1.","method":"Site-specific UV crosslinking/immunoprecipitation; addition of purified protein to in vitro splicing reactions","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with purified protein, single lab","pmids":["12612063"],"is_preprint":false},{"year":2004,"finding":"Transportins 1 (Trn1) and 2b (Trn2b) — but not Trn2a — preferentially bind hnRNP A1 via its M9 shuttling domain, and all three transportins function as import factors for hnRNP A1 in vitro. In digitonin-permeabilized HeLa cells, M9 peptides compete for import of recombinant hnRNP A1.","method":"In vitro binding assays with RanQ69LGTP; digitonin-permeabilized cell import assays; peptide competition","journal":"RNA","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple in vitro binding and cell-based import assays, single lab","pmids":["15037768"],"is_preprint":false},{"year":2004,"finding":"hnRNP A1 has antagonistic functions relative to SR proteins ASF/SF2 and SC35 in regulating beta-tropomyosin exon 6B splicing; hnRNP A1 represses exon 6B splicing by binding a G-rich intronic sequence. ASF/SF2 and SC35 can displace hnRNP A1 binding at overlapping sites.","method":"RNA affinity chromatography; hnRNP A1-depleted nuclear extract/add-back; artificial tethering (MS2 fusion); UV crosslinking","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — depletion/reconstitution combined with tethering and displacement assays","pmids":["15208309"],"is_preprint":false},{"year":2006,"finding":"hnRNP A1 associates with human telomeres in vivo (ChIP) and stimulates telomerase activity. hnRNP A1 binds both single-stranded and structured (G-quadruplex) telomeric repeats, disrupts G-quadruplex higher-order structure, and its depletion from 293 cell extracts dramatically reduces telomerase activity, which is restored by addition of purified recombinant hnRNP A1.","method":"In vitro telomerase assay; hnRNP A/B depletion/reconstitution; ChIP; G-quadruplex disruption assay","journal":"RNA","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with purified protein, depletion/add-back, and ChIP in vivo; multiple methods","pmids":["16603717"],"is_preprint":false},{"year":2007,"finding":"hnRNP A1 is required for processing of miR-18a: it binds specifically to the primary RNA pri-miR-18a before Drosha cleavage; depletion of hnRNP A1 reduces in vitro processing of pri-miR-18a and endogenous pre-miR-18a levels; hnRNP A1 is required for miR-18a-mediated repression of a target reporter in vivo.","method":"In vivo CLIP; in vitro Drosha processing assay; siRNA depletion; reporter assay","journal":"Nature structural & molecular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — CLIP, in vitro processing assay, and in vivo reporter, multiple orthogonal methods","pmids":["17558416"],"is_preprint":false},{"year":2007,"finding":"hnRNP A1 specifically represses SMN2 exon 7 splicing via binding to an exonic splicing silencer (ESS); hnRNP A1 depletion specifically restores SMN2 exon 7 inclusion. Strong and specific interaction between hnRNPA1 and SMN2 exon 7 was demonstrated by two independent methods.","method":"siRNA depletion; RNA-protein interaction assays (two methods); in vivo and in vitro splicing","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — two independent binding assays, depletion functional assay, specificity controls","pmids":["17884807"],"is_preprint":false},{"year":2007,"finding":"hnRNP A1 facilitates HCV replication by interacting with NS5b (RNA-dependent RNA polymerase) and binding both the 5' NTR and 3' NTR of HCV RNA; knockdown of hnRNP A1 or expression of C-terminally truncated hnRNP A1 reduces HCV replication.","method":"Co-immunoprecipitation; yeast two-hybrid; RNA-protein binding; siRNA knockdown; truncation mutant overexpression","journal":"Journal of virology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, Y2H, RNA binding, and loss-of-function, single lab","pmids":["17229681"],"is_preprint":false},{"year":2009,"finding":"hnRNP A1 binds cooperatively to RNA, initiating at a high-affinity ESS and spreading in a 3'-to-5' direction (with some 5'-to-3' spreading also possible). Cooperative spreading displaces SR protein binding to an exonic splicing enhancer and can unwind RNA hairpins upon binding. Two distant high-affinity sites on the same RNA facilitate inter-site spreading.","method":"In vitro RNA binding and splicing assays with purified hnRNP A1; gel-shift; in vitro helicase/unwinding assays","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstitution in vitro with purified protein, mechanistic spreading model directly tested","pmids":["19667073"],"is_preprint":false},{"year":2009,"finding":"hnRNP A1 and hnRNP H can collaborate to modulate 5' splice site selection through homotypic and heterotypic protein-protein interactions (documented by BRET in live cells) via their glycine-rich domains; the GRD of hnRNP A1 can functionally replace that of hnRNP H.","method":"In vitro splicing assays; BRET in live cells; domain swap experiments","journal":"RNA","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — live-cell BRET and in vitro splicing with domain swaps, single lab","pmids":["19926721"],"is_preprint":false},{"year":2010,"finding":"hnRNP A1 acts as a negative regulator of let-7a biogenesis by binding the conserved terminal loop of pri-let-7a-1, inhibiting Drosha processing. hnRNP A1 binding interferes with KSRP binding (a positive regulator), creating antagonistic regulation of let-7a levels.","method":"RNA binding assays; Drosha processing in cell extracts; siRNA depletion; ectopic overexpression; competition binding assay","journal":"Nature structural & molecular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (binding, in vitro processing, depletion/OE, competition)","pmids":["20639884"],"is_preprint":false},{"year":2011,"finding":"hnRNP A1 recapitulates a novel RPA-displacing activity that specifically removes RPA (but not POT1) from telomeric ssDNA, facilitating the RPA-to-POT1 switch required for telomere capping after replication. TERRA inhibits this displacing activity in early S phase and promotes POT1 binding by removing hnRNP A1, coordinating the switch.","method":"In vitro ssDNA-binding competition assay with purified proteins; cell extract fractionation; identification by purified protein reconstitution","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 / Strong — purified protein reconstitution of RPA-displacing activity, mechanistic model validated in vitro","pmids":["21399625"],"is_preprint":false},{"year":2012,"finding":"hnRNP A1 proofreads 3' splice site recognition by U2AF: it forms a ternary complex with U2AF heterodimer on AG-containing/uridine-rich RNAs, while displacing U2AF from non-AG-containing sequences. This activity requires the glycine-rich domain of hnRNP A1, and hnRNP A1 is required for U2AF-mediated recruitment of U2 snRNP.","method":"In vitro depletion/reconstitution; purified component binding assays; NMR; in vivo splicing assays","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — NMR structural data combined with in vitro reconstitution and in vivo functional assays","pmids":["22325350"],"is_preprint":false},{"year":2012,"finding":"VRK1 phosphorylates hnRNP A1, potentiating its binding to telomeric ssDNA and telomerase RNA in vitro and enhancing telomerase activity. VRK1 deficiency in mouse male germ cells induces telomere shortening and activation of DNA-damage signaling.","method":"In vitro kinase assay; telomere length assay; telomerase activity assay; VRK1 knockout mouse germ cells","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro kinase assay plus loss-of-function in vivo, single lab","pmids":["22740652"],"is_preprint":false},{"year":2013,"finding":"Mutations in the prion-like domain (PrLD) of hnRNPA1 (e.g., strengthening a steric zipper motif) cause multisystem proteinopathy and ALS. Wild-type hnRNPA1 forms self-seeding fibrils; disease mutations exacerbate fibril formation and promote excess incorporation into stress granules and cytoplasmic inclusions in animal models.","method":"Fibril formation assay; cross-seeding experiments; stress granule analysis in cells and animal models; mutant protein expression","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — mechanistic fibril assays, cross-seeding, cellular and in vivo animal model validation","pmids":["23455423"],"is_preprint":false},{"year":2013,"finding":"hnRNP A1 controls a splicing regulatory circuit promoting mesenchymal-to-epithelial transition (MET) by binding the Ron exon 11 silencer and antagonizing SRSF1-induced exon 11 skipping (ΔRon). hnRNP A1 also affects Ron splicing indirectly by regulating hnRNP A2/B1 expression levels.","method":"RNA binding/competition assays; splicing assays; siRNA knockdown; ectopic expression; cell migration assays","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — binding competition and splicing assays with functional MET readout, single lab","pmids":["23863836"],"is_preprint":false},{"year":2013,"finding":"hnRNP A1 regulates HMGCR alternative splicing by directly binding to the rs3846662 SNP region to promote exon 13 skipping; overexpression of hnRNPA1 increases the HMGCR13(-)/total HMGCR ratio, stabilizes the HMGCR13(-) transcript specifically, and reduces HMGCR enzyme activity, while enhancing LDL-C uptake.","method":"RNA-protein binding assays (EMSA); overexpression in human cell lines; RT-PCR splicing assay; enzyme activity assay; LDL uptake assay","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple functional assays confirming direct binding and downstream metabolic effect, single lab","pmids":["24001602"],"is_preprint":false},{"year":2014,"finding":"S6K2 phosphorylates hnRNPA1 on novel Ser4/6 sites (N-terminal), increasing its association with BCL-XL and XIAP mRNAs to promote their nuclear export. In the cytoplasm, phospho-S4/6-hnRNPA1 dissociates from these mRNAs, de-repressing their IRES-mediated translation. This is followed by phosphorylation-dependent association with 14-3-3, leading to hnRNPA1 sumoylation on K183 and nuclear re-import.","method":"In vitro kinase assay; phospho-mutant expression (S4/6A); RIP; nuclear/cytoplasmic fractionation; IRES-reporter assays; Co-IP","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vitro kinase assay, phospho-mutant rescue, multiple orthogonal methods (RIP, fractionation, IRES reporter), single lab","pmids":["25324306"],"is_preprint":false},{"year":2015,"finding":"DNA-PKcs phosphorylates hnRNP-A1 during G2/M phase; this phosphorylation promotes the RPA-to-POT1 switch on telomeric single-stranded 3' overhangs. Loss of hnRNP-A1 or DNA-PKcs-dependent hnRNP-A1 phosphorylation impairs this switch, causing DNA damage response at telomeres during mitosis and induction of fragile telomeres.","method":"In vitro kinase assay; cell cycle analysis; telomere FISH; chromatin fractionation; RPA/POT1 binding assays at telomeres","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — kinase assay and functional telomere readouts, single lab","pmids":["25999341"],"is_preprint":false},{"year":2015,"finding":"ALS mutations in ubiquilin-2 reduce its interaction with hnRNPA1 (glycine-rich domain); the hnRNPA1 D262V ALS mutation fails to bind wild-type ubiquilin-2. Ubiquilin-2 functions to stabilize hnRNPA1 (knockdown increases hnRNPA1 turnover), and ALS mutations in UBQLN2 correlate with increased hnRNPA1 cytoplasmic translocation.","method":"Yeast two-hybrid; in vitro binding; co-immunoprecipitation; pulse-chase/protein stability assay; subcellular fractionation","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple binding methods plus functional stability assay, single lab","pmids":["25616961"],"is_preprint":false},{"year":2015,"finding":"hnRNPA1 expression is regulated by a NF-κB2/p52:c-Myc transcriptional circuit, and hnRNPA1 promotes alternative splicing of androgen receptor to generate AR-V7 splice variants in prostate cancer. Knockdown of hnRNPA1 reduces AR-V7 and resensitizes enzalutamide-resistant cells to treatment.","method":"ChIP; siRNA knockdown; RT-PCR splicing assay; reporter assay; cell viability","journal":"Molecular cancer therapeutics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP, knockdown, and splicing assays, single lab","pmids":["26056150"],"is_preprint":false},{"year":2016,"finding":"TRAF6 directly ubiquitinates hnRNPA1 (identified by global ubiquitin screen); this ubiquitination regulates alternative splicing of Arhgap1, which activates Cdc42 GTPase and causes hematopoietic defects in TRAF6-overexpressing HSPCs.","method":"Global ubiquitin screen (mass spectrometry); co-immunoprecipitation; in vitro ubiquitination assay; splicing analysis; Cdc42 activity assay","journal":"Nature immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — unbiased proteomics identification + in vitro ubiquitination + functional splicing and GTPase readouts","pmids":["28024152"],"is_preprint":false},{"year":2016,"finding":"SPSB1 (an E3 ubiquitin ligase adaptor) conjugates K29-linked polyubiquitin chains onto hnRNP A1 in response to EGF signaling. EGF-induced ubiquitylation of hnRNP A1 together with SRPK activation upregulates the Rac1b splicing isoform to promote cell motility.","method":"Co-IP; ubiquitin chain type analysis; EGF treatment; siRNA knockdown; alternative splicing assay; cell migration assay","journal":"Cell research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, ubiquitin chain characterization, splicing and migration functional assays, single lab","pmids":["28084329"],"is_preprint":false},{"year":2017,"finding":"PRMT5 methylates hnRNP A1 on R218 and R225 (symmetric dimethylation); this methylation facilitates hnRNP A1 interaction with IRES RNA to promote IRES-dependent translation of Cyclin D1 and c-Myc.","method":"In vitro methylation assay; mass spectrometry; IRES-reporter assays; RNA-protein binding (pulldown); mutant hnRNP A1","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro methylation, site mapping by MS, mutant validation, functional IRES assay","pmids":["28115626"],"is_preprint":false},{"year":2017,"finding":"The two tandem RRM domains of hnRNP A1 bind simultaneously to a single bipartite ISS-N1 motif (controlling SMN exon 7 splicing): RRM2 binds the upstream motif and RRM1 binds the downstream motif. Disruption of inter-RRM interaction or loss of RNA binding by either RRM impairs splicing repression. Both ISS-N1 binding sites contribute cumulatively to repression.","method":"Solution NMR structures of RRM-RNA complexes; in-cell splicing assays; mutagenesis","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1 / Strong — NMR structures of both RRM-RNA complexes combined with cell-based functional validation and mutagenesis","pmids":["28650318"],"is_preprint":false},{"year":2017,"finding":"HNRNPA1 globally occupies intronic regions near 5' splice sites in vivo (iCLIP), with binding in proximal introns associated with exon repression. The hnRNP A1 consensus binding motif was defined in vivo, enabling identification of therapeutic SSO targets.","method":"iCLIP (individual-nucleotide resolution CLIP); minigene splicing assays; SSO-mediated exon rescue","journal":"BMC biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — iCLIP transcriptome-wide binding map with functional validation in specific targets, single lab","pmids":["27380775"],"is_preprint":false},{"year":2017,"finding":"hnRNP A1 directly binds the 5' UTR G-quadruplex of RON/MTS1R mRNA and activates its IRES-mediated translation; cytoplasmic hnRNP A1 promotes RON translation and cell migration in vitro.","method":"RNA pulldown; reporter (IRES-luciferase); cell migration assay; cytoplasmic hnRNP A1 mutant expression","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RNA pulldown, IRES reporter assay, and functional migration assay, single lab","pmids":["26930004"],"is_preprint":false},{"year":2018,"finding":"β-hydroxybutyrate (β-HB) directly binds hnRNP A1; this binding enhances hnRNP A1 interaction with Oct4 mRNA, stabilizes Oct4 mRNA and protein expression, and leads to increased Lamin B1 to prevent vascular cell senescence.","method":"Protein pulldown/mass spectrometry; RIP; Oct4 mRNA stability assay; senescence assays; in vivo mouse experiments","journal":"Molecular cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pulldown identification, RIP, mRNA stability, and in vivo validation, single lab","pmids":["30197300"],"is_preprint":false},{"year":2018,"finding":"The RGG-box of hnRNPA1 specifically recognizes the loop-containing telomere G-quadruplex DNA (but not single-stranded DNA); loop nucleotide identity is important. The RGG-box enhances the G-quadruplex unfolding activity of the adjacent UP1 domain, acting synergistically for complete telomere G-quadruplex DNA unfolding.","method":"In vitro binding (EMSA, fluorescence); G-quadruplex unfolding assay; domain deletion/truncation analysis","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with domain mutants and G-quadruplex functional assays, single lab","pmids":["30247678"],"is_preprint":false},{"year":2018,"finding":"lncSHGL recruits hnRNPA1 to enhance translation efficiency of CALM mRNAs, increasing calmodulin protein levels and activating the CaM/PI3K/Akt pathway independent of insulin. Hepatic overexpression of hnRNPA1 alone activates this pathway and ameliorates hyperglycemia and steatosis in obese mice.","method":"RNA pulldown; RIP; polysome profiling; in vivo AAV-mediated overexpression in mice; metabolic phenotyping","journal":"Diabetes","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RNA pulldown, RIP, polysome profiling, and in vivo metabolic rescue, single lab","pmids":["29382663"],"is_preprint":false},{"year":2018,"finding":"O-GlcNAcylation of hnRNP A1 increases its interaction with Transportin1 (Trn1) and promotes nuclear sequestration, whereas phosphorylation reduces Trn1 interaction and promotes cytoplasmic accumulation. Several novel O-GlcNAcylation and phosphorylation sites in hnRNP A1 were mapped.","method":"O-GlcNAc site mapping by mass spectrometry; co-immunoprecipitation; subcellular fractionation; OGT inhibitor treatment","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — site mapping by MS plus functional Co-IP and fractionation, single lab","pmids":["27913144"],"is_preprint":false},{"year":2018,"finding":"HNRNPA1 promotes recognition of U2AF2 'decoy' splice sites in vivo (including Alu-derived sequences), shifting U2AF2 binding away from bona fide 3' splice sites of alternative cassette exons, thereby regulating exon definition.","method":"iCLIP of U2AF2 in control vs. HNRNPA1 overexpression cells; splicing analysis","journal":"Genome research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — iCLIP in two conditions with splicing analysis, single lab","pmids":["29650551"],"is_preprint":false},{"year":2018,"finding":"hnRNPA1 interacts with the G-quadruplex in the KRAS promoter GA-element and stimulates KRAS transcription; the hnRNPA1 interaction with G4 DNA in the promoter facilitates transcription of TRA2B similarly.","method":"Circular dichroism; EMSA; chromatin immunoprecipitation; promoter-reporter assay; knockdown","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — CD, EMSA, ChIP, and promoter reporter, single lab","pmids":["31311954"],"is_preprint":false},{"year":2019,"finding":"SIRT1 and SIRT6 deacetylate hnRNP A1 at four lysine residues under glucose starvation conditions; deacetylated hnRNP A1 reduces PKM2 and increases PKM1 alternative splicing, inhibiting glycolysis and HCC cell proliferation.","method":"Co-immunoprecipitation; mass spectrometry (acetylation site mapping); PKM splicing assay; glycolysis assays; mutant hnRNP A1","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, MS site mapping, splicing and metabolic functional assays, single lab","pmids":["30858544"],"is_preprint":false},{"year":2019,"finding":"hnRNP A1 directly binds the 3' UTR of SIRT1 mRNA and promotes its stability, increasing SIRT1 expression. This hnRNP A1-SIRT1-NF-κB pathway delays cellular senescence and SASP by deacetylating NF-κB and blunting IL-6/IL-8 transcription.","method":"RIP; mRNA stability assay; 3' UTR reporter; SIRT1-dependent rescue; senescence assays","journal":"Aging cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RIP, mRNA stability, reporter assay, and functional rescue, single lab","pmids":["27613566"],"is_preprint":false},{"year":2020,"finding":"The cryo-EM structure of hnRNPA1 LC domain amyloid fibrils reveals that the PY-NLS (M9/nuclear localization sequence) forms the fibril core. Residues involved in Kapβ2 (karyopherin-β2) binding also make key interactions to stabilize the fibril; ALS/MSP mutations map to the fibril core. This explains Kapβ2's amyloid disaggregase activity.","method":"Cryo-electron microscopy (fibril structure determination); mutagenesis; fibril formation assays","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — cryo-EM structure with mutagenesis validation and functional ALS mutant mapping","pmids":["33311513"],"is_preprint":false},{"year":2020,"finding":"Systemic overexpression of HNRNPA1 in a DM1 mouse model (via AAV) shifts DM1-relevant splicing targets to fetal isoforms and causes muscle weakness/myopathy. HITS-CLIP reveals direct interactions of HNRNPA1 with these splicing targets in vivo. HNRNPA1 protein levels decrease during postnatal development but are elevated in DM1 skeletal muscle.","method":"AAV-mediated overexpression; HITS-CLIP in vivo; splicing analysis; muscle function assays","journal":"PNAS","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo HITS-CLIP confirming direct interactions combined with disease-relevant functional phenotype","pmids":["32086392"],"is_preprint":false},{"year":2020,"finding":"The RGG-box of hnRNPA1 specifically recognizes loop-containing TERRA RNA G-quadruplexes but not single-stranded RNA; the UP1 domain + RGG-box act together to destabilize loop-containing TERRA G-quadruplexes more efficiently than those without loops.","method":"In vitro binding assays (EMSA, fluorescence); G-quadruplex unfolding assay; domain truncation","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with defined RNA substrates and domain analysis, single lab","pmids":["32128583"],"is_preprint":false},{"year":2020,"finding":"hnRNP A1 is an IRES trans-activating factor (ITAF) for HIV-1, HTLV-1, and MMTV IRESs. Post-translational modifications of hnRNP A1 differentially modulate retroviral IRES activity: PRMT5-induced symmetric dimethylation enables stimulation of HIV-1 and HTLV-1 IRESs while reducing MMTV IRES stimulation; phospho-S4/6D preferentially stimulates the MMTV IRES.","method":"IRES-reporter assays; post-translational modification mutants; knockdown/rescue; in vitro methylation","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple IRES reporters with PTM mutants, single lab","pmids":["32960212"],"is_preprint":false},{"year":2021,"finding":"PRMT4/5/7-mediated arginine methylation of hnRNPA1 (at multiple sites) regulates hnRNPA1 binding to RNA and several alternative splicing events; co-inhibition of PRMT4/5/7 synergistically suppresses cancer cell growth.","method":"Mass spectrometry (methylproteome); RNA binding assays; alternative splicing analysis; pharmacological PRMT inhibition","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — unbiased MS methylproteome with functional RNA binding and splicing readouts, single lab","pmids":["33782401"],"is_preprint":false},{"year":2021,"finding":"hnRNP A1/A2 proteins directly assemble onto 7SK snRNA stem loop 3 (SL3), binding with selectivity via context-dependent mechanisms; up to four hnRNP A1 proteins bind along SL3, preserving its overall structural integrity. SL3 architecture positions minimal hnRNP A1/A2 binding sites (5'-Y/RAG-3') in different local environments modulating assembly.","method":"DMS probing of RNA structure; ITC (calorimetry); SEC-MALS-SAXS; phylogenetic analysis","journal":"Journal of molecular biology","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — multiple biophysical methods (DMS, ITC, SAXS) in a single study, single lab","pmids":["33684393"],"is_preprint":false},{"year":2021,"finding":"HNRNPA1 positively regulates VRK1 translation by binding directly to the 3' UTR of VRK1 mRNA; this increases cyclin D1 expression via VRK1-mediated CREB phosphorylation, promoting lung cancer cell proliferation.","method":"RNA pulldown; RIP; polysome fractionation; VRK1 translation reporter; CREB phosphorylation assay; knockdown/overexpression","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RNA binding and translational assays with signaling readout, single lab","pmids":["34071140"],"is_preprint":false},{"year":2021,"finding":"4 novel and 2 known HNRNPA1 mutations (P288A, D262V, *321Eext*6, *321Qext*6, G304Nfs*3) have different effects on hnRNPA1 fibrillization, liquid-liquid phase separation, and stress granule dynamics: P288A accelerates fibrillization and decelerates SG disassembly; *321Eext*6 has no effect on fibrillization but decelerates SG disassembly; G304Nfs*3 decelerates fibrillization and impairs liquid phase separation.","method":"In vitro fibrillization assay; LLPS assay; live-cell stress granule dynamics (imaging)","journal":"JCI insight","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro fibrillization + LLPS + live-cell SG imaging, single lab","pmids":["34291734"],"is_preprint":false},{"year":2024,"finding":"Dysfunction of hnRNP A1 in MS neurons causes differential binding to RNA targets and aberrant alternative RNA splicing of neuronal function and RNA homeostasis genes, contributing to neurodegeneration. CLIPseq in EAE models confirms differential binding to aberrantly spliced targets; dysfunctional hnRNP A1 expression in neurons caused neurite loss and identical splicing changes.","method":"RNAseq (human MS brain); CLIPseq in vivo (EAE model); neuronal expression of dysfunctional hnRNP A1 + neurite morphometry","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — CLIPseq in vivo combined with human transcriptomics and neuronal loss-of-function with defined phenotype and replicated across human and mouse","pmids":["38191621"],"is_preprint":false},{"year":2024,"finding":"Adipocyte-specific knockout of Hnrnpa1 in obese mice increases macrophage infiltration and inflammatory gene expression in white adipose tissue, exacerbating insulin resistance and hepatic steatosis. Mechanistically, HNRNPA1 interacts with Ccl2 mRNA and regulates its stability.","method":"Adipocyte-specific Hnrnpa1 knockout mouse; metabolic phenotyping; RNA pulldown/RIP for Ccl2 mRNA; mRNA stability assay","journal":"Diabetes","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — tissue-specific KO with defined phenotype and mechanistic RNA stability assay, single lab","pmids":["38320300"],"is_preprint":false},{"year":2015,"finding":"hnRNP A1 reduction (by RNAi or cytoplasmic retention) increases RNA Pol II transcription of a reporter gene and increases CDK9 association with the repressor 7SK RNA, compromising promoter-distal transcription recovery after pause release; transcriptome analysis shows >50% of genes affected by A1/A2 depletion overlap with those affected by CDK9 inhibition.","method":"siRNA knockdown; transcriptome analysis; ChIP of RNA Pol II and CDK9; DRB treatment; reporter assay","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP, transcriptome, and reporter assays in parallel with pharmacological comparison, single lab","pmids":["26011126"],"is_preprint":false}],"current_model":"hnRNP A1 is a multifunctional RNA-binding protein that uses two tandem RRMs to recognize the consensus sequence UAGGGA/U (and related motifs) in RNA, and an intrinsically disordered C-terminal low-complexity domain containing the M9/PY-NLS for Transportin-1/2-mediated nuclear import; it cooperatively spreads along pre-mRNA to repress splicing by displacing SR proteins and blocking U2AF/U2 snRNP recruitment, proofreads 3' splice site recognition by U2AF, regulates miRNA biogenesis (facilitating pri-miR-18a processing by Drosha; inhibiting pri-let-7a Drosha processing), promotes mRNA nuclear export and IRES-mediated translation of specific mRNAs (including BCL-XL, XIAP, c-Myc, Cyclin D1), maintains telomere integrity by displacing RPA from ssDNA overhangs to facilitate the RPA-to-POT1 switch and by stimulating telomerase through G-quadruplex unfolding, and is regulated by multiple post-translational modifications including phosphorylation (by VRK1, DNA-PKcs, S6K2), arginine methylation (by PRMT4/5/7), lysine acetylation (reversed by SIRT1/6), O-GlcNAcylation, and ubiquitination (by TRAF6, SPSB1/Cullin), with ALS/MSP-causing mutations in its PrLD/PY-NLS accelerating fibril formation and dysregulating stress granule dynamics."},"narrative":{"mechanistic_narrative":"hnRNP A1 is a multifunctional nuclear RNA-binding protein that governs alternative pre-mRNA splicing, RNA processing, telomere maintenance, and protein homeostasis through a modular architecture of tandem RRMs and a C-terminal glycine-rich/prion-like domain [PMID:7510636, PMID:7957114, PMID:23455423]. It recognizes the high-affinity UAGGGA/U motif through its two RRMs acting as a composite RNA-binding surface, and the two domains can engage a single bipartite element simultaneously, as resolved for the ISS-N1 motif that controls SMN exon 7 splicing [PMID:7510636, PMID:28650318, PMID:17884807]. In splicing, hnRNP A1 functions predominantly as a repressor: it binds intronic and exonic silencers (HIV-1 tat ISS, c-H-ras rasISS1, c-src N1, beta-tropomyosin, SMN2) and antagonizes SR proteins such as SF2/ASF and SC35 to shift splice-site selection [PMID:7957114, PMID:11598017, PMID:12665590, PMID:15208309, PMID:17884807]. It achieves repression by cooperatively spreading along RNA from a high-affinity site, displacing SR-protein binding and unwinding hairpins, and it proofreads 3' splice-site recognition by forming a ternary complex with U2AF on authentic AG/U-rich sites while removing U2AF from decoy sites, an activity requiring its glycine-rich domain [PMID:19667073, PMID:22325350, PMID:29650551]. The glycine-rich domain also mediates self-association and heterotypic interactions with other hnRNP and SR proteins [PMID:8676373, PMID:19926721]. Beyond splicing, hnRNP A1 controls miRNA biogenesis with opposite signs—promoting Drosha processing of pri-miR-18a but inhibiting pri-let-7a by antagonizing KSRP [PMID:17558416, PMID:20639884]—and promotes IRES-mediated translation and nuclear export of specific mRNAs including BCL-XL and XIAP [PMID:25324306, PMID:28115626]. At telomeres, hnRNP A1 binds single-stranded and G-quadruplex telomeric repeats, stimulates telomerase, and displaces RPA to drive the RPA-to-POT1 switch required for telomere capping [PMID:9620782, PMID:16603717, PMID:21399625]. A 40-residue C-terminal M9 segment serves as a transportin-dependent nuclear localization/shuttling signal, and nuclear accumulation is transcription-dependent [PMID:7730395, PMID:11282028, PMID:15037768]. hnRNP A1 activity is extensively tuned by post-translational modification—phosphorylation, arginine methylation by PRMTs, lysine deacetylation by SIRT1/6, O-GlcNAcylation, and ubiquitination by TRAF6 and SPSB1—which modulate its RNA binding, splicing outputs, IRES activity, and nucleocytoplasmic distribution [PMID:25324306, PMID:28115626, PMID:27913144, PMID:30858544, PMID:33782401, PMID:28024152, PMID:28084329]. Mutations in its prion-like domain cause multisystem proteinopathy and ALS by accelerating fibril formation and dysregulating stress-granule dynamics, with the PY-NLS forming the amyloid fibril core that overlaps the karyopherin-β2 binding surface [PMID:23455423, PMID:33311513, PMID:34291734].","teleology":[{"year":1994,"claim":"Establishing what RNA hnRNP A1 recognizes and how it acts on splicing defined its molecular substrate and first functional output.","evidence":"SELEX with UV crosslinking and in vitro splicing inhibition; mutagenesis of recombinant protein in splicing assays","pmids":["7510636","7957114"],"confidence":"High","gaps":["In vivo binding specificity not yet mapped","Mechanism of SR-protein antagonism not resolved at this stage"]},{"year":1995,"claim":"Identifying the M9 signal answered how hnRNP A1 enters the nucleus, defining a non-classical NLS distinct from the RNA-binding domains.","evidence":"Domain deletion/fusion constructs with subcellular localization microscopy","pmids":["7730395"],"confidence":"High","gaps":["Import receptor not identified at this stage","Coupling of shuttling to RNA cargo not established"]},{"year":1996,"claim":"Mapping protein-protein interactions to the glycine-rich domain explained how hnRNP A1 self-associates and contacts other hnRNP/SR proteins.","evidence":"In vitro pulldown and yeast two-hybrid","pmids":["8676373"],"confidence":"Medium","gaps":["Single lab","Stoichiometry and structural basis of the hydrophobic-repeat motif undefined"]},{"year":1998,"claim":"Demonstrating a telomere-length phenotype with rescue extended hnRNP A1 function beyond splicing into telomere biology.","evidence":"A1-deficient mouse cells with rescue, in vitro ssDNA binding, telomerase recovery from lysate","pmids":["9620782"],"confidence":"High","gaps":["Direct molecular mechanism linking A1 to telomerase not defined","In vivo telomere occupancy not yet shown"]},{"year":2001,"claim":"Defining intronic silencers and transcription-dependent nuclear concentration clarified both the step of splicing repression and the trigger for nuclear localization.","evidence":"Nuclear extract depletion/reconstitution and in vitro splicing; live imaging and microinjection in mouse embryos with transcription inhibition","pmids":["11598017","11282028"],"confidence":"High","gaps":["How nascent transcripts drive carrier-mediated import not mechanistically resolved","Spreading mechanism of repression not yet established"]},{"year":2002,"claim":"Linking shuttling activity to myelopoiesis and BCR/ABL leukemogenesis connected nucleocytoplasmic transport to cell fate and oncogenic signaling.","evidence":"Export-defective mutant in cell and primary models; differentiation, apoptosis, and colony-formation assays","pmids":["11884611"],"confidence":"Medium","gaps":["Dominant-negative phenotype, single lab","Direct mRNA targets in this context not fully defined"]},{"year":2004,"claim":"Identifying transportins as M9-binding import factors resolved which receptors mediate hnRNP A1 nuclear import.","evidence":"In vitro binding with RanQ69L-GTP and digitonin-permeabilized cell import assays with peptide competition","pmids":["15037768"],"confidence":"Medium","gaps":["Single lab","Quantitative selectivity among transportins in vivo not established"]},{"year":2003,"claim":"Multiple target-specific silencers (c-H-ras, c-src, OPMD aggregate sequestration) generalized hnRNP A1 as an SR-antagonizing repressor across transcripts and disease contexts.","evidence":"Depletion/add-back splicing assays, site-specific CLIP, and OPMD patient tissue colocalization","pmids":["12665590","12612063","12945950"],"confidence":"Medium","gaps":["Common mechanistic principle across silencers not yet unified","OPMD sequestration is correlative for RNA-export trapping"]},{"year":2007,"claim":"Discovering roles in miRNA processing and viral replication broadened hnRNP A1 function to small-RNA biogenesis and host-pathogen RNA metabolism.","evidence":"CLIP and in vitro Drosha processing for pri-miR-18a; Co-IP/Y2H, RNA binding, and knockdown for HCV NS5b and NTRs","pmids":["17558416","17884807","17229681"],"confidence":"High","gaps":["How A1 selects pro- vs anti-processing miRNA substrates not yet explained","Structural basis of pri-miRNA loop recognition undefined"]},{"year":2009,"claim":"Defining cooperative 3'-to-5' spreading provided the mechanistic model for how hnRNP A1 represses splicing and displaces SR proteins.","evidence":"In vitro gel-shift, splicing, and helicase/unwinding assays with purified protein; live-cell BRET and domain swaps","pmids":["19667073","19926721"],"confidence":"High","gaps":["Directionality determinants of spreading not fully defined","Quantitative cooperativity parameters in vivo unknown"]},{"year":2010,"claim":"Showing antagonism with KSRP on pri-let-7a established hnRNP A1 as a bidirectional regulator of miRNA biogenesis.","evidence":"RNA binding, Drosha processing in extracts, depletion/overexpression, and competition binding","pmids":["20639884"],"confidence":"High","gaps":["Cellular signals controlling A1-vs-KSRP balance unknown","Generality across other pri-miRNA loops not tested"]},{"year":2011,"claim":"Reconstituting RPA-displacing activity and TERRA regulation revealed how hnRNP A1 times the RPA-to-POT1 switch for telomere capping.","evidence":"In vitro ssDNA-binding competition with purified proteins and cell-extract fractionation","pmids":["21399625"],"confidence":"High","gaps":["In vivo cell-cycle coordination by TERRA not fully demonstrated here","Regulation of the displacing activity by modifications not addressed"]},{"year":2012,"claim":"Mapping U2AF proofreading and VRK1 phosphorylation linked hnRNP A1 to splice-site fidelity and to phosphoregulation of its telomere activity.","evidence":"NMR with in vitro reconstitution and in vivo splicing; in vitro kinase assay with VRK1-knockout germ cells","pmids":["22325350","22740652"],"confidence":"High","gaps":["VRK1 finding is Medium-confidence and single lab","How proofreading integrates with cooperative spreading not resolved"]},{"year":2013,"claim":"Identifying PrLD mutations causing MSP/ALS and roles in EMT/MET established hnRNP A1 in proteinopathy and cancer-relevant splicing programs.","evidence":"Fibril/cross-seeding assays with cellular and animal stress-granule analysis; Ron exon 11 splicing and migration assays","pmids":["23455423","23863836"],"confidence":"High","gaps":["Structural basis of fibril core not yet defined at this stage","Ron circuit study is single lab"]},{"year":2014,"claim":"S6K2 phosphorylation of N-terminal Ser4/6 connected signaling to hnRNP A1-driven mRNA export and IRES translation of BCL-XL/XIAP.","evidence":"In vitro kinase assay, phospho-mutant rescue, RIP, fractionation, and IRES reporters","pmids":["25324306"],"confidence":"High","gaps":["Single lab","In vivo relevance of the sumoylation/re-import cycle not established"]},{"year":2015,"claim":"Multiple findings tied hnRNP A1 to AR-V7 splicing, DNA-PKcs-driven telomere capping, ubiquilin-2 stability, and transcriptional pause control, embedding it in disease and chromatin biology.","evidence":"ChIP/knockdown splicing assays; in vitro kinase and telomere FISH; Y2H/Co-IP and stability assays; Pol II/CDK9 ChIP and transcriptome","pmids":["26056150","25999341","25616961","26011126"],"confidence":"Medium","gaps":["Each study single lab","Mechanistic link between A1 and 7SK/CDK9 control not fully resolved"]},{"year":2016,"claim":"Identifying TRAF6 and SPSB1 ubiquitination established signal-controlled ubiquitin marks that redirect hnRNP A1 splicing outputs.","evidence":"Ubiquitin proteomics, in vitro ubiquitination, and functional splicing/GTPase and migration assays","pmids":["28024152","28084329"],"confidence":"Medium","gaps":["SPSB1 study single lab and Medium-confidence","How distinct ubiquitin chain types alter A1 fate not unified"]},{"year":2017,"claim":"Structural and modification studies defined bipartite RRM-RNA recognition, in vivo intronic binding, PRMT5 methylation control of IRES function, and RGG-box G-quadruplex unfolding.","evidence":"NMR RRM-RNA structures with cell splicing; iCLIP; in vitro methylation/MS with IRES reporters; G-quadruplex unfolding assays","pmids":["28650318","27380775","28115626","30247678","26930004"],"confidence":"High","gaps":["RGG/G-quadruplex and RON IRES studies are Medium-confidence single labs","Integration of RRM and RGG contributions to in vivo specificity incomplete"]},{"year":2018,"claim":"Findings spanning metabolite binding, decoy splice-site recognition, G-quadruplex transcriptional activation, O-GlcNAc/phospho control of import, and metabolic translation roles expanded hnRNP A1 into metabolism and gene-expression regulation.","evidence":"Pulldown/RIP and stability assays; U2AF2 iCLIP; CD/EMSA/ChIP promoter reporters; O-GlcNAc MS with fractionation; polysome profiling and in vivo metabolic rescue","pmids":["30197300","29650551","31311954","27913144","29382663"],"confidence":"Medium","gaps":["Each study single lab","Direct vs indirect contributions to metabolic phenotypes not fully separated"]},{"year":2019,"claim":"SIRT-mediated deacetylation and 3'UTR stabilization of SIRT1 mRNA linked hnRNP A1 acetylation status to glycolytic splicing (PKM) and senescence control.","evidence":"Co-IP/MS acetylation mapping with PKM splicing and glycolysis assays; RIP/mRNA stability and senescence assays","pmids":["30858544","27613566"],"confidence":"Medium","gaps":["Both single lab","Feedback architecture of the A1-SIRT1 axis not fully resolved"]},{"year":2020,"claim":"The cryo-EM fibril structure, in vivo DM1 overexpression phenotype, TERRA G-quadruplex recognition, and retroviral IRES roles connected hnRNP A1 dosage and aggregation to disease mechanisms.","evidence":"Cryo-EM with mutagenesis; AAV overexpression with HITS-CLIP and muscle assays; EMSA/unfolding assays; IRES reporters with PTM mutants","pmids":["33311513","32086392","32128583","32960212"],"confidence":"High","gaps":["Karyopherin-β2 disaggregase activity inferred structurally, not kinetically resolved here","TERRA and retroviral IRES studies single lab Medium-confidence"]},{"year":2021,"claim":"PRMT4/5/7 methylation, 7SK SL3 assembly, VRK1 mRNA translation control, and mutation-specific effects on phase separation refined how modifications and disease alleles tune hnRNP A1 function.","evidence":"Methylproteome MS with RNA binding/splicing; DMS/ITC/SAXS biophysics; RNA binding and translation reporters; in vitro fibrillization/LLPS and live-cell SG imaging","pmids":["33782401","33684393","34071140","34291734"],"confidence":"Medium","gaps":["All single lab","Causal hierarchy among the multiple PRMTs and modification sites unresolved"]},{"year":2024,"claim":"Neuronal and adipocyte loss/dysfunction models tied hnRNP A1 to neurodegeneration via aberrant splicing and to metabolic inflammation via mRNA stability control.","evidence":"Human MS RNAseq with EAE CLIPseq and neurite morphometry; adipocyte-specific knockout with metabolic phenotyping and Ccl2 mRNA stability assay","pmids":["38191621","38320300"],"confidence":"High","gaps":["Adipocyte study Medium-confidence single lab","Whether neuronal splicing changes are primary drivers vs consequences of degeneration not fully resolved"]},{"year":null,"claim":"How the full repertoire of post-translational modifications is combinatorially integrated to switch hnRNP A1 between splicing repression, translation activation, telomere maintenance, and phase separation in a given cellular state remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model linking modification state to functional output in vivo","Quantitative interplay between LLPS, aggregation, and normal RNA functions undefined","Structural basis for switching between RRM-mediated and RGG/G-quadruplex-mediated activities incomplete"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[0,1,14,17,21,33,34,49]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[4,13,20,37,41]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[41]},{"term_id":"GO:0045182","term_label":"translation regulator activity","supporting_discovery_ids":[26,32,35,38,47]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[1,12,21,40]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[3,18]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[2,6,11]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[26,35,39]},{"term_id":"GO:0000228","term_label":"nuclear chromosome","supporting_discovery_ids":[13,20]}],"pathway":[{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[0,1,5,9,12,14,15,19,21,33]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[41,54]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[26,32,38,47]},{"term_id":"R-HSA-9609507","term_label":"Protein localization","supporting_discovery_ids":[2,6,11,26,39]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[23,44,45,51,52]}],"complexes":["stress granule"],"partners":["U2AF2","SRSF1","TNPO1","PRMT5","TRAF6","SPSB1","UBQLN2","HNRNPH1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P09651","full_name":"Heterogeneous nuclear ribonucleoprotein A1","aliases":["Helix-destabilizing protein","Single-strand RNA-binding protein","hnRNP core protein A1"],"length_aa":372,"mass_kda":38.7,"function":"Involved in the packaging of pre-mRNA into hnRNP particles, transport of poly(A) mRNA from the nucleus to the cytoplasm and modulation of splice site selection (PubMed:17371836). Plays a role in the splicing of pyruvate kinase PKM by binding repressively to sequences flanking PKM exon 9, inhibiting exon 9 inclusion and resulting in exon 10 inclusion and production of the PKM M2 isoform (PubMed:20010808). Binds to the IRES and thereby inhibits the translation of the apoptosis protease activating factor APAF1 (PubMed:31498791). May bind to specific miRNA hairpins (PubMed:28431233) (Microbial infection) May play a role in HCV RNA replication (Microbial infection) Cleavage by Enterovirus 71 protease 3C results in increased translation of apoptosis protease activating factor APAF1, leading to apoptosis","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/P09651/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/HNRNPA1","classification":"Not Classified","n_dependent_lines":280,"n_total_lines":1208,"dependency_fraction":0.23178807947019867},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/HNRNPA1","total_profiled":1310},"omim":[{"mim_id":"620410","title":"LOW DENSITY LIPOPROTEIN CHOLESTEROL LEVEL QUANTITATIVE TRAIT LOCUS 3; LDLCQ3","url":"https://www.omim.org/entry/620410"},{"mim_id":"617158","title":"MYOPATHY, DISTAL, WITH RIMMED VACUOLES; DMRV","url":"https://www.omim.org/entry/617158"},{"mim_id":"615426","title":"AMYOTROPHIC LATERAL SCLEROSIS 20; ALS20","url":"https://www.omim.org/entry/615426"},{"mim_id":"615424","title":"INCLUSION BODY MYOPATHY WITH EARLY-ONSET PAGET DISEASE WITH OR WITHOUT FRONTOTEMPORAL DEMENTIA 3; IBMPFD3","url":"https://www.omim.org/entry/615424"},{"mim_id":"615422","title":"INCLUSION BODY MYOPATHY WITH EARLY-ONSET PAGET DISEASE WITH OR WITHOUT FRONTOTEMPORAL DEMENTIA 2; IBMPFD2","url":"https://www.omim.org/entry/615422"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Enhanced","locations":[{"location":"Nucleoplasm","reliability":"Enhanced"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/HNRNPA1"},"hgnc":{"alias_symbol":["hnRNP-A1","ALS20"],"prev_symbol":["HNRPA1"]},"alphafold":{"accession":"P09651","domains":[{"cath_id":"3.30.70.330","chopping":"10-89","consensus_level":"high","plddt":95.3986,"start":10,"end":89},{"cath_id":"3.30.70.330","chopping":"105-180","consensus_level":"high","plddt":94.0951,"start":105,"end":180}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P09651","model_url":"https://alphafold.ebi.ac.uk/files/AF-P09651-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P09651-F1-predicted_aligned_error_v6.png","plddt_mean":67.56},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=HNRNPA1","jax_strain_url":"https://www.jax.org/strain/search?query=HNRNPA1"},"sequence":{"accession":"P09651","fasta_url":"https://rest.uniprot.org/uniprotkb/P09651.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P09651/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P09651"}},"corpus_meta":[{"pmid":"23455423","id":"PMC_23455423","title":"Mutations 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Knockout Aggravates Obesity-Induced Metabolic Dysfunction via Upregulation of CCL2.","date":"2024","source":"Diabetes","url":"https://pubmed.ncbi.nlm.nih.gov/38320300","citation_count":20,"is_preprint":false},{"pmid":"38720175","id":"PMC_38720175","title":"SNHG15-mediated feedback loop interplays with HNRNPA1/SLC7A11/GPX4 pathway to promote gastric cancer progression.","date":"2024","source":"Cancer science","url":"https://pubmed.ncbi.nlm.nih.gov/38720175","citation_count":20,"is_preprint":false},{"pmid":"33809384","id":"PMC_33809384","title":"Multiple Sclerosis-Associated hnRNPA1 Mutations Alter hnRNPA1 Dynamics and Influence Stress Granule Formation.","date":"2021","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/33809384","citation_count":20,"is_preprint":false},{"pmid":"24628426","id":"PMC_24628426","title":"Thermodynamic and phylogenetic insights into hnRNP A1 recognition of the HIV-1 exon splicing silencer 3 element.","date":"2014","source":"Biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/24628426","citation_count":20,"is_preprint":false},{"pmid":"33515514","id":"PMC_33515514","title":"Lentiviral vector ALS20 yields high hemoglobin levels with low genomic integrations for treatment of beta-globinopathies.","date":"2021","source":"Molecular therapy : the journal of the American Society of Gene Therapy","url":"https://pubmed.ncbi.nlm.nih.gov/33515514","citation_count":19,"is_preprint":false},{"pmid":"32290247","id":"PMC_32290247","title":"hnRNP A1 Regulates Alternative Splicing of Tau Exon 10 by Targeting 3' Splice Sites.","date":"2020","source":"Cells","url":"https://pubmed.ncbi.nlm.nih.gov/32290247","citation_count":19,"is_preprint":false},{"pmid":"34418284","id":"PMC_34418284","title":"hnRNP-A1 binds to the IRES of MELOE-1 antigen to promote MELOE-1 translation in stressed melanoma cells.","date":"2021","source":"Molecular oncology","url":"https://pubmed.ncbi.nlm.nih.gov/34418284","citation_count":18,"is_preprint":false},{"pmid":"29229447","id":"PMC_29229447","title":"hnRNP A1 promotes keratinocyte cell survival post UVB radiation through PI3K/Akt/mTOR pathway.","date":"2017","source":"Experimental cell research","url":"https://pubmed.ncbi.nlm.nih.gov/29229447","citation_count":17,"is_preprint":false},{"pmid":"29077485","id":"PMC_29077485","title":"The Splicing Factor hnRNPA1 Regulates Alternate Splicing of the MYLK Gene.","date":"2018","source":"American journal of respiratory cell and molecular biology","url":"https://pubmed.ncbi.nlm.nih.gov/29077485","citation_count":17,"is_preprint":false},{"pmid":"40056904","id":"PMC_40056904","title":"LTA4H improves the tumor microenvironment and prevents HCC progression via targeting the HNRNPA1/LTBP1/TGF-β axis.","date":"2025","source":"Cell reports. Medicine","url":"https://pubmed.ncbi.nlm.nih.gov/40056904","citation_count":16,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":50300,"output_tokens":13069,"usd":0.173467,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":24443,"output_tokens":7166,"usd":0.150682,"stage2_stop_reason":"end_turn"},"total_usd":0.324149,"stage1_batch_id":"msgbatch_01DUPACZi7AAWwuZiUjseQF4","stage2_batch_id":"msgbatch_018yt7chE3f48PEFtDwtj6AE","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1994,\n      \"finding\": \"hnRNP A1 is a sequence-specific RNA-binding protein; its consensus high-affinity binding site is UAGGGA/U, determined by SELEX from random RNA pools. Both RNA-binding domains (RBDs) act as a single composite to confer specificity, and the highest-affinity winner sequence (containing a duplication separated by two nucleotides) binds with Kd ~1 nM. Oligonucleotides containing this site are potent inhibitors of in vitro pre-mRNA splicing.\",\n      \"method\": \"SELEX/selection-amplification from random RNA pools; UV crosslinking; in vitro splicing inhibition assay\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with quantitative binding measurements and functional splicing assay, rigorous controls\",\n      \"pmids\": [\"7510636\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"hnRNP A1 antagonizes SR proteins (SF2/ASF, SC35) to activate distal 5' splice sites. Two conserved Phe residues in the RNP-1 submotif of each RBD are essential for modulating alternative splicing (but not general pre-mRNA binding). The C-terminal Gly-rich domain is necessary for alternative splicing activity, stable RNA binding, and RNA annealing activity.\",\n      \"method\": \"Mutagenesis of recombinant hnRNP A1; in vitro splicing assays; RNA-binding assays\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstitution with mutagenesis and functional splicing assays\",\n      \"pmids\": [\"7957114\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"A ~40 amino acid segment near the C-terminus of hnRNP A1, designated M9, is necessary and sufficient for nuclear localization. Fusion of M9 to cytoplasmic proteins (β-galactosidase, pyruvate kinase) redirected them to the nucleus. M9 is a novel NLS type distinct from classical basic-type NLS; the RBDs and RGG box are not required for nuclear localization.\",\n      \"method\": \"Domain deletion/fusion constructs; subcellular localization by microscopy in cultured cells\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — necessity and sufficiency tested with multiple fusion constructs, replicated across cell types\",\n      \"pmids\": [\"7730395\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"hnRNP A1 selectively interacts with itself and other hnRNP core proteins (and some SR proteins) through its C-terminal Gly-rich domain. This domain is necessary and sufficient for both in vitro binding and in vivo interaction as tested by yeast two-hybrid assay; a novel hydrophobic-repeat protein-binding motif within the Gly-rich domain mediates these interactions.\",\n      \"method\": \"In vitro pulldown; yeast two-hybrid assay\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal in vitro and in vivo (yeast two-hybrid) methods, single lab\",\n      \"pmids\": [\"8676373\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"hnRNP A1 participates in telomere biogenesis in mammals. A1-deficient mouse cells have shorter telomeres; restoring A1 expression increases telomere length. UP1 (N-terminal fragment of A1) binds single-stranded vertebrate telomeric repeats directly and specifically in vitro, and can recover telomerase activity from cell lysate, implying A1/UP1 modulates telomere length via interaction with telomerase.\",\n      \"method\": \"A1-deficient mouse cell line analysis; telomere length assay; in vitro DNA binding; telomerase recovery from lysate\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — loss-of-function cell line with rescue, in vitro binding, and functional telomerase assay\",\n      \"pmids\": [\"9620782\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"hnRNP A1 inhibits HIV-1 tat intron splicing via a novel intronic splicing silencer (ISS) that overlaps with alternative branch point sequences, blocking U2 snRNP association (but at a step after U2AF binding). Recombinant hnRNP A1 added to depleted nuclear extracts restores splicing inhibition; hnRNP A1 interacts specifically with the ISS sequence.\",\n      \"method\": \"hnRNP A1 depletion/reconstitution of nuclear extracts; in vitro splicing assays; RNA-protein binding assays\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstitution with purified components, depletion/add-back, mechanistic step defined\",\n      \"pmids\": [\"11598017\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Nuclear accumulation of hnRNP A1 is transcription-dependent: in transcriptionally inactive embryos it equilibrates passively between nucleus and cytoplasm, but in transcriptionally active embryos it concentrates in the nucleus via carrier-mediated (transportin-dependent) import. The presence of nascent transcripts in the nucleus (not cytoplasmic RNA) is the critical event driving nuclear concentration.\",\n      \"method\": \"Live imaging and microinjection in mouse embryos; transcription inhibition; nuclear transplantation; wheat germ agglutinin nuclear pore blockade\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct localization experiments in embryos with functional perturbations and nuclear transplantation\",\n      \"pmids\": [\"11282028\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"The nucleocytoplasmic shuttling activity of hnRNP A1 is required for normal myelopoiesis and BCR/ABL leukemogenesis. BCR/ABL stabilizes hnRNP A1 by preventing its ubiquitin/proteasome-dependent degradation. A nuclear-export-defective mutant suppresses granulocytic differentiation, enhances apoptosis, and reduces BCR/ABL-dependent colony formation, with downstream loss of C/EBPα and Bcl-XL mRNAs.\",\n      \"method\": \"Expression of export-defective mutant in cell lines and primary cells; colony formation; differentiation assays; BCR/ABL transformation model\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — dominant-negative mutant with multiple phenotypic readouts, single lab\",\n      \"pmids\": [\"11884611\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"hnRNP A1 and hnRNP A/B interact with PABPN1, and co-localize with mutant PABPN1 in intranuclear aggregates in OPMD; hnRNP A1 is sequestered in OPMD patient muscle inclusions, supporting the idea that inclusions act as 'poly(A) RNA traps' interfering with RNA export.\",\n      \"method\": \"Yeast two-hybrid screen; GST pulldown; co-immunoprecipitation; co-localization in cellular OPMD model and patient tissue\",\n      \"journal\": \"The Canadian journal of neurological sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal binding methods (Y2H + Co-IP + pulldown) plus patient tissue; single lab\",\n      \"pmids\": [\"12945950\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"hnRNP A1 binds a downstream intronic silencer (rasISS1) and inhibits c-H-ras IDX exon splicing. Depletion and add-back experiments in nuclear extracts confirm the inhibitory role; SR proteins SC35 and SRp40 counteract this inhibition.\",\n      \"method\": \"Depletion/add-back in nuclear extracts; in vitro splicing assays; RNA-protein binding\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstitution with depletion/add-back in nuclear extracts, mechanistic rescue demonstrated\",\n      \"pmids\": [\"12665590\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"hnRNP A1 binds the 5' half of c-src exon N1 (identified by UV crosslinking and immunoprecipitation) and represses N1 splicing in vitro via a mechanism distinct from PTB-mediated repression and independent of PTB binding sites upstream of N1.\",\n      \"method\": \"Site-specific UV crosslinking/immunoprecipitation; addition of purified protein to in vitro splicing reactions\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with purified protein, single lab\",\n      \"pmids\": [\"12612063\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Transportins 1 (Trn1) and 2b (Trn2b) — but not Trn2a — preferentially bind hnRNP A1 via its M9 shuttling domain, and all three transportins function as import factors for hnRNP A1 in vitro. In digitonin-permeabilized HeLa cells, M9 peptides compete for import of recombinant hnRNP A1.\",\n      \"method\": \"In vitro binding assays with RanQ69LGTP; digitonin-permeabilized cell import assays; peptide competition\",\n      \"journal\": \"RNA\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple in vitro binding and cell-based import assays, single lab\",\n      \"pmids\": [\"15037768\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"hnRNP A1 has antagonistic functions relative to SR proteins ASF/SF2 and SC35 in regulating beta-tropomyosin exon 6B splicing; hnRNP A1 represses exon 6B splicing by binding a G-rich intronic sequence. ASF/SF2 and SC35 can displace hnRNP A1 binding at overlapping sites.\",\n      \"method\": \"RNA affinity chromatography; hnRNP A1-depleted nuclear extract/add-back; artificial tethering (MS2 fusion); UV crosslinking\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — depletion/reconstitution combined with tethering and displacement assays\",\n      \"pmids\": [\"15208309\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"hnRNP A1 associates with human telomeres in vivo (ChIP) and stimulates telomerase activity. hnRNP A1 binds both single-stranded and structured (G-quadruplex) telomeric repeats, disrupts G-quadruplex higher-order structure, and its depletion from 293 cell extracts dramatically reduces telomerase activity, which is restored by addition of purified recombinant hnRNP A1.\",\n      \"method\": \"In vitro telomerase assay; hnRNP A/B depletion/reconstitution; ChIP; G-quadruplex disruption assay\",\n      \"journal\": \"RNA\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with purified protein, depletion/add-back, and ChIP in vivo; multiple methods\",\n      \"pmids\": [\"16603717\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"hnRNP A1 is required for processing of miR-18a: it binds specifically to the primary RNA pri-miR-18a before Drosha cleavage; depletion of hnRNP A1 reduces in vitro processing of pri-miR-18a and endogenous pre-miR-18a levels; hnRNP A1 is required for miR-18a-mediated repression of a target reporter in vivo.\",\n      \"method\": \"In vivo CLIP; in vitro Drosha processing assay; siRNA depletion; reporter assay\",\n      \"journal\": \"Nature structural & molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — CLIP, in vitro processing assay, and in vivo reporter, multiple orthogonal methods\",\n      \"pmids\": [\"17558416\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"hnRNP A1 specifically represses SMN2 exon 7 splicing via binding to an exonic splicing silencer (ESS); hnRNP A1 depletion specifically restores SMN2 exon 7 inclusion. Strong and specific interaction between hnRNPA1 and SMN2 exon 7 was demonstrated by two independent methods.\",\n      \"method\": \"siRNA depletion; RNA-protein interaction assays (two methods); in vivo and in vitro splicing\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — two independent binding assays, depletion functional assay, specificity controls\",\n      \"pmids\": [\"17884807\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"hnRNP A1 facilitates HCV replication by interacting with NS5b (RNA-dependent RNA polymerase) and binding both the 5' NTR and 3' NTR of HCV RNA; knockdown of hnRNP A1 or expression of C-terminally truncated hnRNP A1 reduces HCV replication.\",\n      \"method\": \"Co-immunoprecipitation; yeast two-hybrid; RNA-protein binding; siRNA knockdown; truncation mutant overexpression\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, Y2H, RNA binding, and loss-of-function, single lab\",\n      \"pmids\": [\"17229681\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"hnRNP A1 binds cooperatively to RNA, initiating at a high-affinity ESS and spreading in a 3'-to-5' direction (with some 5'-to-3' spreading also possible). Cooperative spreading displaces SR protein binding to an exonic splicing enhancer and can unwind RNA hairpins upon binding. Two distant high-affinity sites on the same RNA facilitate inter-site spreading.\",\n      \"method\": \"In vitro RNA binding and splicing assays with purified hnRNP A1; gel-shift; in vitro helicase/unwinding assays\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstitution in vitro with purified protein, mechanistic spreading model directly tested\",\n      \"pmids\": [\"19667073\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"hnRNP A1 and hnRNP H can collaborate to modulate 5' splice site selection through homotypic and heterotypic protein-protein interactions (documented by BRET in live cells) via their glycine-rich domains; the GRD of hnRNP A1 can functionally replace that of hnRNP H.\",\n      \"method\": \"In vitro splicing assays; BRET in live cells; domain swap experiments\",\n      \"journal\": \"RNA\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — live-cell BRET and in vitro splicing with domain swaps, single lab\",\n      \"pmids\": [\"19926721\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"hnRNP A1 acts as a negative regulator of let-7a biogenesis by binding the conserved terminal loop of pri-let-7a-1, inhibiting Drosha processing. hnRNP A1 binding interferes with KSRP binding (a positive regulator), creating antagonistic regulation of let-7a levels.\",\n      \"method\": \"RNA binding assays; Drosha processing in cell extracts; siRNA depletion; ectopic overexpression; competition binding assay\",\n      \"journal\": \"Nature structural & molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (binding, in vitro processing, depletion/OE, competition)\",\n      \"pmids\": [\"20639884\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"hnRNP A1 recapitulates a novel RPA-displacing activity that specifically removes RPA (but not POT1) from telomeric ssDNA, facilitating the RPA-to-POT1 switch required for telomere capping after replication. TERRA inhibits this displacing activity in early S phase and promotes POT1 binding by removing hnRNP A1, coordinating the switch.\",\n      \"method\": \"In vitro ssDNA-binding competition assay with purified proteins; cell extract fractionation; identification by purified protein reconstitution\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — purified protein reconstitution of RPA-displacing activity, mechanistic model validated in vitro\",\n      \"pmids\": [\"21399625\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"hnRNP A1 proofreads 3' splice site recognition by U2AF: it forms a ternary complex with U2AF heterodimer on AG-containing/uridine-rich RNAs, while displacing U2AF from non-AG-containing sequences. This activity requires the glycine-rich domain of hnRNP A1, and hnRNP A1 is required for U2AF-mediated recruitment of U2 snRNP.\",\n      \"method\": \"In vitro depletion/reconstitution; purified component binding assays; NMR; in vivo splicing assays\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — NMR structural data combined with in vitro reconstitution and in vivo functional assays\",\n      \"pmids\": [\"22325350\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"VRK1 phosphorylates hnRNP A1, potentiating its binding to telomeric ssDNA and telomerase RNA in vitro and enhancing telomerase activity. VRK1 deficiency in mouse male germ cells induces telomere shortening and activation of DNA-damage signaling.\",\n      \"method\": \"In vitro kinase assay; telomere length assay; telomerase activity assay; VRK1 knockout mouse germ cells\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro kinase assay plus loss-of-function in vivo, single lab\",\n      \"pmids\": [\"22740652\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Mutations in the prion-like domain (PrLD) of hnRNPA1 (e.g., strengthening a steric zipper motif) cause multisystem proteinopathy and ALS. Wild-type hnRNPA1 forms self-seeding fibrils; disease mutations exacerbate fibril formation and promote excess incorporation into stress granules and cytoplasmic inclusions in animal models.\",\n      \"method\": \"Fibril formation assay; cross-seeding experiments; stress granule analysis in cells and animal models; mutant protein expression\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — mechanistic fibril assays, cross-seeding, cellular and in vivo animal model validation\",\n      \"pmids\": [\"23455423\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"hnRNP A1 controls a splicing regulatory circuit promoting mesenchymal-to-epithelial transition (MET) by binding the Ron exon 11 silencer and antagonizing SRSF1-induced exon 11 skipping (ΔRon). hnRNP A1 also affects Ron splicing indirectly by regulating hnRNP A2/B1 expression levels.\",\n      \"method\": \"RNA binding/competition assays; splicing assays; siRNA knockdown; ectopic expression; cell migration assays\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — binding competition and splicing assays with functional MET readout, single lab\",\n      \"pmids\": [\"23863836\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"hnRNP A1 regulates HMGCR alternative splicing by directly binding to the rs3846662 SNP region to promote exon 13 skipping; overexpression of hnRNPA1 increases the HMGCR13(-)/total HMGCR ratio, stabilizes the HMGCR13(-) transcript specifically, and reduces HMGCR enzyme activity, while enhancing LDL-C uptake.\",\n      \"method\": \"RNA-protein binding assays (EMSA); overexpression in human cell lines; RT-PCR splicing assay; enzyme activity assay; LDL uptake assay\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple functional assays confirming direct binding and downstream metabolic effect, single lab\",\n      \"pmids\": [\"24001602\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"S6K2 phosphorylates hnRNPA1 on novel Ser4/6 sites (N-terminal), increasing its association with BCL-XL and XIAP mRNAs to promote their nuclear export. In the cytoplasm, phospho-S4/6-hnRNPA1 dissociates from these mRNAs, de-repressing their IRES-mediated translation. This is followed by phosphorylation-dependent association with 14-3-3, leading to hnRNPA1 sumoylation on K183 and nuclear re-import.\",\n      \"method\": \"In vitro kinase assay; phospho-mutant expression (S4/6A); RIP; nuclear/cytoplasmic fractionation; IRES-reporter assays; Co-IP\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vitro kinase assay, phospho-mutant rescue, multiple orthogonal methods (RIP, fractionation, IRES reporter), single lab\",\n      \"pmids\": [\"25324306\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"DNA-PKcs phosphorylates hnRNP-A1 during G2/M phase; this phosphorylation promotes the RPA-to-POT1 switch on telomeric single-stranded 3' overhangs. Loss of hnRNP-A1 or DNA-PKcs-dependent hnRNP-A1 phosphorylation impairs this switch, causing DNA damage response at telomeres during mitosis and induction of fragile telomeres.\",\n      \"method\": \"In vitro kinase assay; cell cycle analysis; telomere FISH; chromatin fractionation; RPA/POT1 binding assays at telomeres\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — kinase assay and functional telomere readouts, single lab\",\n      \"pmids\": [\"25999341\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"ALS mutations in ubiquilin-2 reduce its interaction with hnRNPA1 (glycine-rich domain); the hnRNPA1 D262V ALS mutation fails to bind wild-type ubiquilin-2. Ubiquilin-2 functions to stabilize hnRNPA1 (knockdown increases hnRNPA1 turnover), and ALS mutations in UBQLN2 correlate with increased hnRNPA1 cytoplasmic translocation.\",\n      \"method\": \"Yeast two-hybrid; in vitro binding; co-immunoprecipitation; pulse-chase/protein stability assay; subcellular fractionation\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple binding methods plus functional stability assay, single lab\",\n      \"pmids\": [\"25616961\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"hnRNPA1 expression is regulated by a NF-κB2/p52:c-Myc transcriptional circuit, and hnRNPA1 promotes alternative splicing of androgen receptor to generate AR-V7 splice variants in prostate cancer. Knockdown of hnRNPA1 reduces AR-V7 and resensitizes enzalutamide-resistant cells to treatment.\",\n      \"method\": \"ChIP; siRNA knockdown; RT-PCR splicing assay; reporter assay; cell viability\",\n      \"journal\": \"Molecular cancer therapeutics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP, knockdown, and splicing assays, single lab\",\n      \"pmids\": [\"26056150\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"TRAF6 directly ubiquitinates hnRNPA1 (identified by global ubiquitin screen); this ubiquitination regulates alternative splicing of Arhgap1, which activates Cdc42 GTPase and causes hematopoietic defects in TRAF6-overexpressing HSPCs.\",\n      \"method\": \"Global ubiquitin screen (mass spectrometry); co-immunoprecipitation; in vitro ubiquitination assay; splicing analysis; Cdc42 activity assay\",\n      \"journal\": \"Nature immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — unbiased proteomics identification + in vitro ubiquitination + functional splicing and GTPase readouts\",\n      \"pmids\": [\"28024152\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"SPSB1 (an E3 ubiquitin ligase adaptor) conjugates K29-linked polyubiquitin chains onto hnRNP A1 in response to EGF signaling. EGF-induced ubiquitylation of hnRNP A1 together with SRPK activation upregulates the Rac1b splicing isoform to promote cell motility.\",\n      \"method\": \"Co-IP; ubiquitin chain type analysis; EGF treatment; siRNA knockdown; alternative splicing assay; cell migration assay\",\n      \"journal\": \"Cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, ubiquitin chain characterization, splicing and migration functional assays, single lab\",\n      \"pmids\": [\"28084329\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"PRMT5 methylates hnRNP A1 on R218 and R225 (symmetric dimethylation); this methylation facilitates hnRNP A1 interaction with IRES RNA to promote IRES-dependent translation of Cyclin D1 and c-Myc.\",\n      \"method\": \"In vitro methylation assay; mass spectrometry; IRES-reporter assays; RNA-protein binding (pulldown); mutant hnRNP A1\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro methylation, site mapping by MS, mutant validation, functional IRES assay\",\n      \"pmids\": [\"28115626\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"The two tandem RRM domains of hnRNP A1 bind simultaneously to a single bipartite ISS-N1 motif (controlling SMN exon 7 splicing): RRM2 binds the upstream motif and RRM1 binds the downstream motif. Disruption of inter-RRM interaction or loss of RNA binding by either RRM impairs splicing repression. Both ISS-N1 binding sites contribute cumulatively to repression.\",\n      \"method\": \"Solution NMR structures of RRM-RNA complexes; in-cell splicing assays; mutagenesis\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — NMR structures of both RRM-RNA complexes combined with cell-based functional validation and mutagenesis\",\n      \"pmids\": [\"28650318\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"HNRNPA1 globally occupies intronic regions near 5' splice sites in vivo (iCLIP), with binding in proximal introns associated with exon repression. The hnRNP A1 consensus binding motif was defined in vivo, enabling identification of therapeutic SSO targets.\",\n      \"method\": \"iCLIP (individual-nucleotide resolution CLIP); minigene splicing assays; SSO-mediated exon rescue\",\n      \"journal\": \"BMC biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — iCLIP transcriptome-wide binding map with functional validation in specific targets, single lab\",\n      \"pmids\": [\"27380775\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"hnRNP A1 directly binds the 5' UTR G-quadruplex of RON/MTS1R mRNA and activates its IRES-mediated translation; cytoplasmic hnRNP A1 promotes RON translation and cell migration in vitro.\",\n      \"method\": \"RNA pulldown; reporter (IRES-luciferase); cell migration assay; cytoplasmic hnRNP A1 mutant expression\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RNA pulldown, IRES reporter assay, and functional migration assay, single lab\",\n      \"pmids\": [\"26930004\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"β-hydroxybutyrate (β-HB) directly binds hnRNP A1; this binding enhances hnRNP A1 interaction with Oct4 mRNA, stabilizes Oct4 mRNA and protein expression, and leads to increased Lamin B1 to prevent vascular cell senescence.\",\n      \"method\": \"Protein pulldown/mass spectrometry; RIP; Oct4 mRNA stability assay; senescence assays; in vivo mouse experiments\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pulldown identification, RIP, mRNA stability, and in vivo validation, single lab\",\n      \"pmids\": [\"30197300\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"The RGG-box of hnRNPA1 specifically recognizes the loop-containing telomere G-quadruplex DNA (but not single-stranded DNA); loop nucleotide identity is important. The RGG-box enhances the G-quadruplex unfolding activity of the adjacent UP1 domain, acting synergistically for complete telomere G-quadruplex DNA unfolding.\",\n      \"method\": \"In vitro binding (EMSA, fluorescence); G-quadruplex unfolding assay; domain deletion/truncation analysis\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with domain mutants and G-quadruplex functional assays, single lab\",\n      \"pmids\": [\"30247678\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"lncSHGL recruits hnRNPA1 to enhance translation efficiency of CALM mRNAs, increasing calmodulin protein levels and activating the CaM/PI3K/Akt pathway independent of insulin. Hepatic overexpression of hnRNPA1 alone activates this pathway and ameliorates hyperglycemia and steatosis in obese mice.\",\n      \"method\": \"RNA pulldown; RIP; polysome profiling; in vivo AAV-mediated overexpression in mice; metabolic phenotyping\",\n      \"journal\": \"Diabetes\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RNA pulldown, RIP, polysome profiling, and in vivo metabolic rescue, single lab\",\n      \"pmids\": [\"29382663\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"O-GlcNAcylation of hnRNP A1 increases its interaction with Transportin1 (Trn1) and promotes nuclear sequestration, whereas phosphorylation reduces Trn1 interaction and promotes cytoplasmic accumulation. Several novel O-GlcNAcylation and phosphorylation sites in hnRNP A1 were mapped.\",\n      \"method\": \"O-GlcNAc site mapping by mass spectrometry; co-immunoprecipitation; subcellular fractionation; OGT inhibitor treatment\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — site mapping by MS plus functional Co-IP and fractionation, single lab\",\n      \"pmids\": [\"27913144\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"HNRNPA1 promotes recognition of U2AF2 'decoy' splice sites in vivo (including Alu-derived sequences), shifting U2AF2 binding away from bona fide 3' splice sites of alternative cassette exons, thereby regulating exon definition.\",\n      \"method\": \"iCLIP of U2AF2 in control vs. HNRNPA1 overexpression cells; splicing analysis\",\n      \"journal\": \"Genome research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — iCLIP in two conditions with splicing analysis, single lab\",\n      \"pmids\": [\"29650551\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"hnRNPA1 interacts with the G-quadruplex in the KRAS promoter GA-element and stimulates KRAS transcription; the hnRNPA1 interaction with G4 DNA in the promoter facilitates transcription of TRA2B similarly.\",\n      \"method\": \"Circular dichroism; EMSA; chromatin immunoprecipitation; promoter-reporter assay; knockdown\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — CD, EMSA, ChIP, and promoter reporter, single lab\",\n      \"pmids\": [\"31311954\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"SIRT1 and SIRT6 deacetylate hnRNP A1 at four lysine residues under glucose starvation conditions; deacetylated hnRNP A1 reduces PKM2 and increases PKM1 alternative splicing, inhibiting glycolysis and HCC cell proliferation.\",\n      \"method\": \"Co-immunoprecipitation; mass spectrometry (acetylation site mapping); PKM splicing assay; glycolysis assays; mutant hnRNP A1\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, MS site mapping, splicing and metabolic functional assays, single lab\",\n      \"pmids\": [\"30858544\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"hnRNP A1 directly binds the 3' UTR of SIRT1 mRNA and promotes its stability, increasing SIRT1 expression. This hnRNP A1-SIRT1-NF-κB pathway delays cellular senescence and SASP by deacetylating NF-κB and blunting IL-6/IL-8 transcription.\",\n      \"method\": \"RIP; mRNA stability assay; 3' UTR reporter; SIRT1-dependent rescue; senescence assays\",\n      \"journal\": \"Aging cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RIP, mRNA stability, reporter assay, and functional rescue, single lab\",\n      \"pmids\": [\"27613566\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"The cryo-EM structure of hnRNPA1 LC domain amyloid fibrils reveals that the PY-NLS (M9/nuclear localization sequence) forms the fibril core. Residues involved in Kapβ2 (karyopherin-β2) binding also make key interactions to stabilize the fibril; ALS/MSP mutations map to the fibril core. This explains Kapβ2's amyloid disaggregase activity.\",\n      \"method\": \"Cryo-electron microscopy (fibril structure determination); mutagenesis; fibril formation assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — cryo-EM structure with mutagenesis validation and functional ALS mutant mapping\",\n      \"pmids\": [\"33311513\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Systemic overexpression of HNRNPA1 in a DM1 mouse model (via AAV) shifts DM1-relevant splicing targets to fetal isoforms and causes muscle weakness/myopathy. HITS-CLIP reveals direct interactions of HNRNPA1 with these splicing targets in vivo. HNRNPA1 protein levels decrease during postnatal development but are elevated in DM1 skeletal muscle.\",\n      \"method\": \"AAV-mediated overexpression; HITS-CLIP in vivo; splicing analysis; muscle function assays\",\n      \"journal\": \"PNAS\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo HITS-CLIP confirming direct interactions combined with disease-relevant functional phenotype\",\n      \"pmids\": [\"32086392\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"The RGG-box of hnRNPA1 specifically recognizes loop-containing TERRA RNA G-quadruplexes but not single-stranded RNA; the UP1 domain + RGG-box act together to destabilize loop-containing TERRA G-quadruplexes more efficiently than those without loops.\",\n      \"method\": \"In vitro binding assays (EMSA, fluorescence); G-quadruplex unfolding assay; domain truncation\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with defined RNA substrates and domain analysis, single lab\",\n      \"pmids\": [\"32128583\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"hnRNP A1 is an IRES trans-activating factor (ITAF) for HIV-1, HTLV-1, and MMTV IRESs. Post-translational modifications of hnRNP A1 differentially modulate retroviral IRES activity: PRMT5-induced symmetric dimethylation enables stimulation of HIV-1 and HTLV-1 IRESs while reducing MMTV IRES stimulation; phospho-S4/6D preferentially stimulates the MMTV IRES.\",\n      \"method\": \"IRES-reporter assays; post-translational modification mutants; knockdown/rescue; in vitro methylation\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple IRES reporters with PTM mutants, single lab\",\n      \"pmids\": [\"32960212\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"PRMT4/5/7-mediated arginine methylation of hnRNPA1 (at multiple sites) regulates hnRNPA1 binding to RNA and several alternative splicing events; co-inhibition of PRMT4/5/7 synergistically suppresses cancer cell growth.\",\n      \"method\": \"Mass spectrometry (methylproteome); RNA binding assays; alternative splicing analysis; pharmacological PRMT inhibition\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — unbiased MS methylproteome with functional RNA binding and splicing readouts, single lab\",\n      \"pmids\": [\"33782401\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"hnRNP A1/A2 proteins directly assemble onto 7SK snRNA stem loop 3 (SL3), binding with selectivity via context-dependent mechanisms; up to four hnRNP A1 proteins bind along SL3, preserving its overall structural integrity. SL3 architecture positions minimal hnRNP A1/A2 binding sites (5'-Y/RAG-3') in different local environments modulating assembly.\",\n      \"method\": \"DMS probing of RNA structure; ITC (calorimetry); SEC-MALS-SAXS; phylogenetic analysis\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — multiple biophysical methods (DMS, ITC, SAXS) in a single study, single lab\",\n      \"pmids\": [\"33684393\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"HNRNPA1 positively regulates VRK1 translation by binding directly to the 3' UTR of VRK1 mRNA; this increases cyclin D1 expression via VRK1-mediated CREB phosphorylation, promoting lung cancer cell proliferation.\",\n      \"method\": \"RNA pulldown; RIP; polysome fractionation; VRK1 translation reporter; CREB phosphorylation assay; knockdown/overexpression\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RNA binding and translational assays with signaling readout, single lab\",\n      \"pmids\": [\"34071140\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"4 novel and 2 known HNRNPA1 mutations (P288A, D262V, *321Eext*6, *321Qext*6, G304Nfs*3) have different effects on hnRNPA1 fibrillization, liquid-liquid phase separation, and stress granule dynamics: P288A accelerates fibrillization and decelerates SG disassembly; *321Eext*6 has no effect on fibrillization but decelerates SG disassembly; G304Nfs*3 decelerates fibrillization and impairs liquid phase separation.\",\n      \"method\": \"In vitro fibrillization assay; LLPS assay; live-cell stress granule dynamics (imaging)\",\n      \"journal\": \"JCI insight\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro fibrillization + LLPS + live-cell SG imaging, single lab\",\n      \"pmids\": [\"34291734\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Dysfunction of hnRNP A1 in MS neurons causes differential binding to RNA targets and aberrant alternative RNA splicing of neuronal function and RNA homeostasis genes, contributing to neurodegeneration. CLIPseq in EAE models confirms differential binding to aberrantly spliced targets; dysfunctional hnRNP A1 expression in neurons caused neurite loss and identical splicing changes.\",\n      \"method\": \"RNAseq (human MS brain); CLIPseq in vivo (EAE model); neuronal expression of dysfunctional hnRNP A1 + neurite morphometry\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — CLIPseq in vivo combined with human transcriptomics and neuronal loss-of-function with defined phenotype and replicated across human and mouse\",\n      \"pmids\": [\"38191621\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Adipocyte-specific knockout of Hnrnpa1 in obese mice increases macrophage infiltration and inflammatory gene expression in white adipose tissue, exacerbating insulin resistance and hepatic steatosis. Mechanistically, HNRNPA1 interacts with Ccl2 mRNA and regulates its stability.\",\n      \"method\": \"Adipocyte-specific Hnrnpa1 knockout mouse; metabolic phenotyping; RNA pulldown/RIP for Ccl2 mRNA; mRNA stability assay\",\n      \"journal\": \"Diabetes\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — tissue-specific KO with defined phenotype and mechanistic RNA stability assay, single lab\",\n      \"pmids\": [\"38320300\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"hnRNP A1 reduction (by RNAi or cytoplasmic retention) increases RNA Pol II transcription of a reporter gene and increases CDK9 association with the repressor 7SK RNA, compromising promoter-distal transcription recovery after pause release; transcriptome analysis shows >50% of genes affected by A1/A2 depletion overlap with those affected by CDK9 inhibition.\",\n      \"method\": \"siRNA knockdown; transcriptome analysis; ChIP of RNA Pol II and CDK9; DRB treatment; reporter assay\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP, transcriptome, and reporter assays in parallel with pharmacological comparison, single lab\",\n      \"pmids\": [\"26011126\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"hnRNP A1 is a multifunctional RNA-binding protein that uses two tandem RRMs to recognize the consensus sequence UAGGGA/U (and related motifs) in RNA, and an intrinsically disordered C-terminal low-complexity domain containing the M9/PY-NLS for Transportin-1/2-mediated nuclear import; it cooperatively spreads along pre-mRNA to repress splicing by displacing SR proteins and blocking U2AF/U2 snRNP recruitment, proofreads 3' splice site recognition by U2AF, regulates miRNA biogenesis (facilitating pri-miR-18a processing by Drosha; inhibiting pri-let-7a Drosha processing), promotes mRNA nuclear export and IRES-mediated translation of specific mRNAs (including BCL-XL, XIAP, c-Myc, Cyclin D1), maintains telomere integrity by displacing RPA from ssDNA overhangs to facilitate the RPA-to-POT1 switch and by stimulating telomerase through G-quadruplex unfolding, and is regulated by multiple post-translational modifications including phosphorylation (by VRK1, DNA-PKcs, S6K2), arginine methylation (by PRMT4/5/7), lysine acetylation (reversed by SIRT1/6), O-GlcNAcylation, and ubiquitination (by TRAF6, SPSB1/Cullin), with ALS/MSP-causing mutations in its PrLD/PY-NLS accelerating fibril formation and dysregulating stress granule dynamics.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"hnRNP A1 is a multifunctional nuclear RNA-binding protein that governs alternative pre-mRNA splicing, RNA processing, telomere maintenance, and protein homeostasis through a modular architecture of tandem RRMs and a C-terminal glycine-rich/prion-like domain [#0, #1, #23]. It recognizes the high-affinity UAGGGA/U motif through its two RRMs acting as a composite RNA-binding surface, and the two domains can engage a single bipartite element simultaneously, as resolved for the ISS-N1 motif that controls SMN exon 7 splicing [#0, #33, #15]. In splicing, hnRNP A1 functions predominantly as a repressor: it binds intronic and exonic silencers (HIV-1 tat ISS, c-H-ras rasISS1, c-src N1, beta-tropomyosin, SMN2) and antagonizes SR proteins such as SF2/ASF and SC35 to shift splice-site selection [#1, #5, #9, #12, #15]. It achieves repression by cooperatively spreading along RNA from a high-affinity site, displacing SR-protein binding and unwinding hairpins, and it proofreads 3' splice-site recognition by forming a ternary complex with U2AF on authentic AG/U-rich sites while removing U2AF from decoy sites, an activity requiring its glycine-rich domain [#17, #21, #40]. The glycine-rich domain also mediates self-association and heterotypic interactions with other hnRNP and SR proteins [#3, #18]. Beyond splicing, hnRNP A1 controls miRNA biogenesis with opposite signs—promoting Drosha processing of pri-miR-18a but inhibiting pri-let-7a by antagonizing KSRP [#14, #19]—and promotes IRES-mediated translation and nuclear export of specific mRNAs including BCL-XL and XIAP [#26, #32]. At telomeres, hnRNP A1 binds single-stranded and G-quadruplex telomeric repeats, stimulates telomerase, and displaces RPA to drive the RPA-to-POT1 switch required for telomere capping [#4, #13, #20]. A 40-residue C-terminal M9 segment serves as a transportin-dependent nuclear localization/shuttling signal, and nuclear accumulation is transcription-dependent [#2, #6, #11]. hnRNP A1 activity is extensively tuned by post-translational modification—phosphorylation, arginine methylation by PRMTs, lysine deacetylation by SIRT1/6, O-GlcNAcylation, and ubiquitination by TRAF6 and SPSB1—which modulate its RNA binding, splicing outputs, IRES activity, and nucleocytoplasmic distribution [#26, #32, #39, #42, #48, #30, #31]. Mutations in its prion-like domain cause multisystem proteinopathy and ALS by accelerating fibril formation and dysregulating stress-granule dynamics, with the PY-NLS forming the amyloid fibril core that overlaps the karyopherin-β2 binding surface [#23, #44, #51].\",\n  \"teleology\": [\n    {\n      \"year\": 1994,\n      \"claim\": \"Establishing what RNA hnRNP A1 recognizes and how it acts on splicing defined its molecular substrate and first functional output.\",\n      \"evidence\": \"SELEX with UV crosslinking and in vitro splicing inhibition; mutagenesis of recombinant protein in splicing assays\",\n      \"pmids\": [\"7510636\", \"7957114\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo binding specificity not yet mapped\", \"Mechanism of SR-protein antagonism not resolved at this stage\"]\n    },\n    {\n      \"year\": 1995,\n      \"claim\": \"Identifying the M9 signal answered how hnRNP A1 enters the nucleus, defining a non-classical NLS distinct from the RNA-binding domains.\",\n      \"evidence\": \"Domain deletion/fusion constructs with subcellular localization microscopy\",\n      \"pmids\": [\"7730395\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Import receptor not identified at this stage\", \"Coupling of shuttling to RNA cargo not established\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Mapping protein-protein interactions to the glycine-rich domain explained how hnRNP A1 self-associates and contacts other hnRNP/SR proteins.\",\n      \"evidence\": \"In vitro pulldown and yeast two-hybrid\",\n      \"pmids\": [\"8676373\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Stoichiometry and structural basis of the hydrophobic-repeat motif undefined\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Demonstrating a telomere-length phenotype with rescue extended hnRNP A1 function beyond splicing into telomere biology.\",\n      \"evidence\": \"A1-deficient mouse cells with rescue, in vitro ssDNA binding, telomerase recovery from lysate\",\n      \"pmids\": [\"9620782\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct molecular mechanism linking A1 to telomerase not defined\", \"In vivo telomere occupancy not yet shown\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Defining intronic silencers and transcription-dependent nuclear concentration clarified both the step of splicing repression and the trigger for nuclear localization.\",\n      \"evidence\": \"Nuclear extract depletion/reconstitution and in vitro splicing; live imaging and microinjection in mouse embryos with transcription inhibition\",\n      \"pmids\": [\"11598017\", \"11282028\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How nascent transcripts drive carrier-mediated import not mechanistically resolved\", \"Spreading mechanism of repression not yet established\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Linking shuttling activity to myelopoiesis and BCR/ABL leukemogenesis connected nucleocytoplasmic transport to cell fate and oncogenic signaling.\",\n      \"evidence\": \"Export-defective mutant in cell and primary models; differentiation, apoptosis, and colony-formation assays\",\n      \"pmids\": [\"11884611\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Dominant-negative phenotype, single lab\", \"Direct mRNA targets in this context not fully defined\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Identifying transportins as M9-binding import factors resolved which receptors mediate hnRNP A1 nuclear import.\",\n      \"evidence\": \"In vitro binding with RanQ69L-GTP and digitonin-permeabilized cell import assays with peptide competition\",\n      \"pmids\": [\"15037768\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Quantitative selectivity among transportins in vivo not established\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Multiple target-specific silencers (c-H-ras, c-src, OPMD aggregate sequestration) generalized hnRNP A1 as an SR-antagonizing repressor across transcripts and disease contexts.\",\n      \"evidence\": \"Depletion/add-back splicing assays, site-specific CLIP, and OPMD patient tissue colocalization\",\n      \"pmids\": [\"12665590\", \"12612063\", \"12945950\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Common mechanistic principle across silencers not yet unified\", \"OPMD sequestration is correlative for RNA-export trapping\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Discovering roles in miRNA processing and viral replication broadened hnRNP A1 function to small-RNA biogenesis and host-pathogen RNA metabolism.\",\n      \"evidence\": \"CLIP and in vitro Drosha processing for pri-miR-18a; Co-IP/Y2H, RNA binding, and knockdown for HCV NS5b and NTRs\",\n      \"pmids\": [\"17558416\", \"17884807\", \"17229681\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How A1 selects pro- vs anti-processing miRNA substrates not yet explained\", \"Structural basis of pri-miRNA loop recognition undefined\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Defining cooperative 3'-to-5' spreading provided the mechanistic model for how hnRNP A1 represses splicing and displaces SR proteins.\",\n      \"evidence\": \"In vitro gel-shift, splicing, and helicase/unwinding assays with purified protein; live-cell BRET and domain swaps\",\n      \"pmids\": [\"19667073\", \"19926721\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Directionality determinants of spreading not fully defined\", \"Quantitative cooperativity parameters in vivo unknown\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Showing antagonism with KSRP on pri-let-7a established hnRNP A1 as a bidirectional regulator of miRNA biogenesis.\",\n      \"evidence\": \"RNA binding, Drosha processing in extracts, depletion/overexpression, and competition binding\",\n      \"pmids\": [\"20639884\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cellular signals controlling A1-vs-KSRP balance unknown\", \"Generality across other pri-miRNA loops not tested\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Reconstituting RPA-displacing activity and TERRA regulation revealed how hnRNP A1 times the RPA-to-POT1 switch for telomere capping.\",\n      \"evidence\": \"In vitro ssDNA-binding competition with purified proteins and cell-extract fractionation\",\n      \"pmids\": [\"21399625\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo cell-cycle coordination by TERRA not fully demonstrated here\", \"Regulation of the displacing activity by modifications not addressed\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Mapping U2AF proofreading and VRK1 phosphorylation linked hnRNP A1 to splice-site fidelity and to phosphoregulation of its telomere activity.\",\n      \"evidence\": \"NMR with in vitro reconstitution and in vivo splicing; in vitro kinase assay with VRK1-knockout germ cells\",\n      \"pmids\": [\"22325350\", \"22740652\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"VRK1 finding is Medium-confidence and single lab\", \"How proofreading integrates with cooperative spreading not resolved\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Identifying PrLD mutations causing MSP/ALS and roles in EMT/MET established hnRNP A1 in proteinopathy and cancer-relevant splicing programs.\",\n      \"evidence\": \"Fibril/cross-seeding assays with cellular and animal stress-granule analysis; Ron exon 11 splicing and migration assays\",\n      \"pmids\": [\"23455423\", \"23863836\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of fibril core not yet defined at this stage\", \"Ron circuit study is single lab\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"S6K2 phosphorylation of N-terminal Ser4/6 connected signaling to hnRNP A1-driven mRNA export and IRES translation of BCL-XL/XIAP.\",\n      \"evidence\": \"In vitro kinase assay, phospho-mutant rescue, RIP, fractionation, and IRES reporters\",\n      \"pmids\": [\"25324306\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Single lab\", \"In vivo relevance of the sumoylation/re-import cycle not established\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Multiple findings tied hnRNP A1 to AR-V7 splicing, DNA-PKcs-driven telomere capping, ubiquilin-2 stability, and transcriptional pause control, embedding it in disease and chromatin biology.\",\n      \"evidence\": \"ChIP/knockdown splicing assays; in vitro kinase and telomere FISH; Y2H/Co-IP and stability assays; Pol II/CDK9 ChIP and transcriptome\",\n      \"pmids\": [\"26056150\", \"25999341\", \"25616961\", \"26011126\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Each study single lab\", \"Mechanistic link between A1 and 7SK/CDK9 control not fully resolved\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Identifying TRAF6 and SPSB1 ubiquitination established signal-controlled ubiquitin marks that redirect hnRNP A1 splicing outputs.\",\n      \"evidence\": \"Ubiquitin proteomics, in vitro ubiquitination, and functional splicing/GTPase and migration assays\",\n      \"pmids\": [\"28024152\", \"28084329\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"SPSB1 study single lab and Medium-confidence\", \"How distinct ubiquitin chain types alter A1 fate not unified\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Structural and modification studies defined bipartite RRM-RNA recognition, in vivo intronic binding, PRMT5 methylation control of IRES function, and RGG-box G-quadruplex unfolding.\",\n      \"evidence\": \"NMR RRM-RNA structures with cell splicing; iCLIP; in vitro methylation/MS with IRES reporters; G-quadruplex unfolding assays\",\n      \"pmids\": [\"28650318\", \"27380775\", \"28115626\", \"30247678\", \"26930004\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"RGG/G-quadruplex and RON IRES studies are Medium-confidence single labs\", \"Integration of RRM and RGG contributions to in vivo specificity incomplete\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Findings spanning metabolite binding, decoy splice-site recognition, G-quadruplex transcriptional activation, O-GlcNAc/phospho control of import, and metabolic translation roles expanded hnRNP A1 into metabolism and gene-expression regulation.\",\n      \"evidence\": \"Pulldown/RIP and stability assays; U2AF2 iCLIP; CD/EMSA/ChIP promoter reporters; O-GlcNAc MS with fractionation; polysome profiling and in vivo metabolic rescue\",\n      \"pmids\": [\"30197300\", \"29650551\", \"31311954\", \"27913144\", \"29382663\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Each study single lab\", \"Direct vs indirect contributions to metabolic phenotypes not fully separated\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"SIRT-mediated deacetylation and 3'UTR stabilization of SIRT1 mRNA linked hnRNP A1 acetylation status to glycolytic splicing (PKM) and senescence control.\",\n      \"evidence\": \"Co-IP/MS acetylation mapping with PKM splicing and glycolysis assays; RIP/mRNA stability and senescence assays\",\n      \"pmids\": [\"30858544\", \"27613566\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Both single lab\", \"Feedback architecture of the A1-SIRT1 axis not fully resolved\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"The cryo-EM fibril structure, in vivo DM1 overexpression phenotype, TERRA G-quadruplex recognition, and retroviral IRES roles connected hnRNP A1 dosage and aggregation to disease mechanisms.\",\n      \"evidence\": \"Cryo-EM with mutagenesis; AAV overexpression with HITS-CLIP and muscle assays; EMSA/unfolding assays; IRES reporters with PTM mutants\",\n      \"pmids\": [\"33311513\", \"32086392\", \"32128583\", \"32960212\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Karyopherin-β2 disaggregase activity inferred structurally, not kinetically resolved here\", \"TERRA and retroviral IRES studies single lab Medium-confidence\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"PRMT4/5/7 methylation, 7SK SL3 assembly, VRK1 mRNA translation control, and mutation-specific effects on phase separation refined how modifications and disease alleles tune hnRNP A1 function.\",\n      \"evidence\": \"Methylproteome MS with RNA binding/splicing; DMS/ITC/SAXS biophysics; RNA binding and translation reporters; in vitro fibrillization/LLPS and live-cell SG imaging\",\n      \"pmids\": [\"33782401\", \"33684393\", \"34071140\", \"34291734\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"All single lab\", \"Causal hierarchy among the multiple PRMTs and modification sites unresolved\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Neuronal and adipocyte loss/dysfunction models tied hnRNP A1 to neurodegeneration via aberrant splicing and to metabolic inflammation via mRNA stability control.\",\n      \"evidence\": \"Human MS RNAseq with EAE CLIPseq and neurite morphometry; adipocyte-specific knockout with metabolic phenotyping and Ccl2 mRNA stability assay\",\n      \"pmids\": [\"38191621\", \"38320300\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Adipocyte study Medium-confidence single lab\", \"Whether neuronal splicing changes are primary drivers vs consequences of degeneration not fully resolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the full repertoire of post-translational modifications is combinatorially integrated to switch hnRNP A1 between splicing repression, translation activation, telomere maintenance, and phase separation in a given cellular state remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model linking modification state to functional output in vivo\", \"Quantitative interplay between LLPS, aggregation, and normal RNA functions undefined\", \"Structural basis for switching between RRM-mediated and RGG/G-quadruplex-mediated activities incomplete\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [0, 1, 14, 17, 21, 33, 34, 49]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [4, 13, 20, 37, 41]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [41]},\n      {\"term_id\": \"GO:0045182\", \"supporting_discovery_ids\": [26, 32, 35, 38, 47]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [1, 12, 21, 40]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [3, 18]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [2, 6, 11]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [26, 35, 39]},\n      {\"term_id\": \"GO:0000228\", \"supporting_discovery_ids\": [13, 20]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [0, 1, 5, 9, 12, 14, 15, 19, 21, 33]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [41, 54]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [26, 32, 38, 47]},\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [2, 6, 11, 26, 39]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [23, 44, 45, 51, 52]}\n    ],\n    \"complexes\": [\"stress granule\"],\n    \"partners\": [\"U2AF2\", \"SRSF1\", \"TNPO1\", \"PRMT5\", \"TRAF6\", \"SPSB1\", \"UBQLN2\", \"HNRNPH1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":9,"faith_total":9,"faith_pct":100.0}}