{"gene":"TAF15","run_date":"2026-04-28T21:42:58","timeline":{"discoveries":[{"year":1996,"finding":"hTAF15 (hTAFII68) was identified as a novel TBP-associated factor (TAF) that co-purifies with a subpopulation of TFIID complexes and with RNA polymerase II, and can enter the preinitiation complex together with Pol II. It contains a consensus RNA-binding domain (RNP-CS) and binds both RNA and single-stranded DNA.","method":"Biochemical co-purification, cloning and characterization, RNA/ssDNA binding assays","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 — original discovery paper with multiple biochemical methods (co-purification, binding assays), highly cited foundational study","pmids":["8890175"],"is_preprint":false},{"year":1998,"finding":"In vitro binding studies revealed that hTAFII68 (TAF15) interacts with specific TFIID subunits and with RNA Polymerase II subunits, and that EWS and hTAFII68 interact with the same TFIID subunits, suggesting their presence in TFIID is mutually exclusive.","method":"In vitro binding studies, co-immunoprecipitation, biochemical fractionation","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1–2 — direct in vitro binding assays with defined subunits, replicated and extended original findings","pmids":["9488465"],"is_preprint":false},{"year":2008,"finding":"Endogenous TAF15 is methylated in vivo at its RGG repeats by PRMT1 (identified as a TAF15 interactor and the major PRMT responsible). Methylation of RGG repeats affects subcellular localization and is required for TAF15 to positively regulate expression of its target genes.","method":"In vivo methylation assays, co-immunoprecipitation, subcellular fractionation, gene expression assays, loss-of-function","journal":"Experimental cell research","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (co-IP, subcellular fractionation, gene expression) in a single study demonstrating writer-substrate relationship and functional consequences","pmids":["19124016"],"is_preprint":false},{"year":2009,"finding":"A fraction of human U1 snRNA specifically associates with TAF15 to form a novel chromatin-associated U1-TAF15 snRNP that is distinct from the spliceosomal U1-Sm snRNP; none of the known U1-Sm snRNP protein components interact with the U1-TAF15 particle. This particle accumulates in nucleolar caps upon transcriptional inhibition and its biogenesis depends on the Sm-binding motif of U1 snRNA.","method":"Immunoprecipitation, RNA co-precipitation, fluorescence microscopy, transcriptional inhibition experiments","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 2 — reciprocal co-IPs, RNA dependence tested, multiple orthogonal approaches","pmids":["19282884"],"is_preprint":false},{"year":2011,"finding":"TAF15 associates with a subset of the spliceosomal U1 snRNP complex via direct protein-protein interaction between the N-terminal domain of TAF15 and U1C protein, as demonstrated by pulldown assays with recombinant proteins and immunoprecipitation of U1 snRNA and Sm proteins with TAF15 antibodies.","method":"Immunoprecipitation, pulldown with recombinant proteins, UV cross-linking, co-precipitation","journal":"Biochimica et biophysica acta","confidence":"Medium","confidence_rationale":"Tier 2 — direct protein-protein interaction demonstrated with recombinant proteins, single lab","pmids":["22019700"],"is_preprint":false},{"year":2011,"finding":"All endogenous FET proteins (including TAF15) are recruited into cytoplasmic stress granules upon general inhibition of Transportin-mediated nuclear import, implicating Transportin-dependent nuclear import in maintaining TAF15 nuclear localization. TAF15 co-accumulates with FUS in FTLD inclusions but not in ALS-FUS inclusions.","method":"Cell culture experiments, Transportin inhibition, immunohistochemistry, immunoblot of insoluble fractions","journal":"Brain : a journal of neurology","confidence":"Medium","confidence_rationale":"Tier 2 — direct experimental manipulation (Transportin inhibition) with clear localization readout, single lab","pmids":["21856723"],"is_preprint":false},{"year":2012,"finding":"The C-terminus of TAF15 contains a Transportin-dependent nuclear localization signal (NLS), and its RGG domain can be targeted to stress granules. TAF15 cellular localization depends on ongoing transcription, and TAF15 co-localizes with RNA granules in the cytoplasm of neuronal HT22 cells in a cell-type-dependent manner.","method":"Domain deletion and mutagenesis, live imaging, immunofluorescence, transcriptional inhibition","journal":"Gene","confidence":"Medium","confidence_rationale":"Tier 2 — direct experimental domain mapping with functional localization consequences, single lab","pmids":["22771914"],"is_preprint":false},{"year":2012,"finding":"TAF15 knockdown reduces cellular proliferation and increases apoptosis. TAF15 regulates expression of cell cycle genes post-transcriptionally through a miRNA pathway: TAF15 depletion decreases levels of onco-miR-17 locus miRNAs (miR-17-5p and miR-20a), leading to upregulation of CDKN1A/p21.","method":"siRNA knockdown, global gene expression profiling, miRNA analysis, flow cytometry","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 — loss-of-function with defined molecular pathway, multiple readouts, single lab","pmids":["23128393"],"is_preprint":false},{"year":2013,"finding":"FUS, EWSR1, and TAF15 form homo- and heterocomplexes via a conserved N-terminal motif (FETBM1). This interaction is RNA- and DNA-independent and robust under high-salt conditions. The FETBM1 motif is required for complex formation and also for binding of normal full-length FET proteins to their oncogenic fusion proteins.","method":"Pulldown with recombinant proteins, mass spectrometry, mutagenesis","journal":"FASEB journal","confidence":"High","confidence_rationale":"Tier 1–2 — reconstitution with recombinant proteins, mutagenesis of defined motif, multiple orthogonal methods","pmids":["23975937"],"is_preprint":false},{"year":2013,"finding":"CLIP-seq and RNA-seq in human brain and mouse neurons identified conserved TAF15 RNA binding targets; TAF15 regulates alternative splicing of neuronal RNAs, including a critical splicing event in the Grin1 (NMDA receptor zeta-1 subunit) transcript that controls NR1 activity and trafficking.","method":"CLIP-seq (iCLIP), RNA-seq, TAF15 knockdown","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 1–2 — in vivo crosslinking, genome-wide profiling, and loss-of-function with defined splicing phenotype","pmids":["23416048"],"is_preprint":false},{"year":2014,"finding":"TAF15 co-immunoprecipitates preferentially with hnRNP M3/4 isoforms (higher MW), while TLS/FUS associates with hnRNP M1/2 (lower MW), via direct protein-protein interactions through the amino-termini of the TET proteins, independently of RNA.","method":"Immunoprecipitation, pulldown with recombinant proteins, co-localization","journal":"Molecular biology reports","confidence":"Medium","confidence_rationale":"Tier 3 — direct protein interaction demonstrated, single lab","pmids":["24474660"],"is_preprint":false},{"year":2015,"finding":"NMR structure of the TAF15 RRM domain reveals a non-canonical mode of RNA recognition: binding to stem-loop RNA is mediated primarily by hydrogen bonding between RNA bases and a concave face on the RRM surface rather than classical stacking interactions at RNP sites. RNA binding is dependent on structural elements in the RNA rather than sequence alone.","method":"Solution NMR spectroscopy, calorimetry, docking, molecular dynamics simulation","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 1 — structure determination with functional validation (binding affinity measurements across RNA variants)","pmids":["26612539"],"is_preprint":false},{"year":2016,"finding":"CLIP-seq and RNA Bind-N-Seq in mouse brains showed TAF15 binds ~4,900 RNAs enriched for GGUA motifs. TAF15 and FUS show similar binding in introns and 3'UTRs, but unlike FUS and TDP-43, TAF15 has a minimal role in alternative splicing. In human neural progenitors, TAF15 and FUS affect RNA target turnover.","method":"CLIP-seq, RNA Bind-N-Seq, RNA-seq, loss-of-function in multiple cell types","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1–2 — two independent genome-wide technologies, validated in multiple cell systems","pmids":["27378374"],"is_preprint":false},{"year":2017,"finding":"TAF15 low-complexity (LC) domain forms amyloid-like fibrils that bind RNA Pol II CTD. NMR and fluorescence microscopy (FRAP) showed the interaction involves heptads throughout CTD, with lysines at position 7 contributing through electrostatic interactions; mutation of these lysines to consensus serines reduced binding.","method":"NMR spectroscopy, hydrogel fluorescence microscopy, FRAP, mutagenesis","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 1 — NMR structure/interaction data, FRAP, mutagenesis in one study","pmids":["28945358"],"is_preprint":false},{"year":2017,"finding":"PRMT1 shows differential interaction with RGG-boxes of TAF15 compared to FUS and EWS. The Asp residue in TAF15's YGGDR(S/G)G repeats confers poor binding to PRMT1, suggesting reduced overall methylation of TAF15 compared to other FET proteins and contributing to TAF15 functional specialization.","method":"Peptide-based binding assays, novel 2-hybrid binding assay, mutagenesis","journal":"Protein science","confidence":"Medium","confidence_rationale":"Tier 2 — biochemical binding assays with defined peptide substrates and mutagenesis, single lab","pmids":["29193371"],"is_preprint":false},{"year":2004,"finding":"TAF15 (hTAFII68) is phosphorylated on tyrosine residue(s) by v-Src kinase in vitro and in vivo, and TAF15 associates with SH3 domains of v-Src and other cell signaling proteins. v-Src stimulates TAF15-mediated transcriptional activation, while dominant-negative Src reduces TAF15 transactivation function.","method":"In vitro kinase assays, in vivo tyrosine phosphorylation, co-immunoprecipitation with SH3 domains, transactivation reporter assays","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2 — in vitro and in vivo phosphorylation combined with functional reporter assay, single lab","pmids":["15094065"],"is_preprint":false},{"year":2009,"finding":"TAF15 and the leukemia-associated fusion protein TAF15-CIZ/NMP4 are specifically cleaved by caspases-3 and -7 at the consensus sequence 106DQPD/Y110 as identified by mutagenesis.","method":"In vitro caspase cleavage assays, site-directed mutagenesis, cell-based apoptosis assays","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 1–2 — in vitro cleavage with mutagenesis to map site, demonstrated in cells","pmids":["19426707"],"is_preprint":false},{"year":2022,"finding":"TAF15 C-terminal RGG domain associates with SRPK1 and inhibits its kinase activity, causing partial relocalization of SRPK1 to the nucleus, hypophosphorylation of SR proteins, inhibition of splicing of a reporter minigene, and inhibition of Lamin B receptor phosphorylation.","method":"Co-immunoprecipitation, kinase activity assays, overexpression, reporter minigene splicing assay, immunofluorescence","journal":"Cells","confidence":"Medium","confidence_rationale":"Tier 2 — direct interaction and functional consequences via multiple assays, single lab","pmids":["36611919"],"is_preprint":false},{"year":2022,"finding":"TIF1γ binds TBP in competition with TAF15 and impedes TAF15/TBP-mediated IL-6 transactivation. TIF1γ modifies TAF15 through multi-mono-ubiquitylation and drives nuclear export of TAF15, thereby inhibiting TAF15-promoted EMT and metastasis in lung adenocarcinoma cells.","method":"Co-immunoprecipitation, competition assays, luciferase reporter, ubiquitylation assays, immunofluorescence, nuclear export assays","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods identifying modifier (TIF1γ), substrate (TAF15), mechanism (ubiquitylation and nuclear export), and functional consequence","pmids":["36261009"],"is_preprint":false},{"year":2023,"finding":"Cryo-EM structures of amyloid filaments extracted from FTLD-FUS patient brains show that the filaments are composed of TAF15, not FUS. The filament fold is formed from residues 7-99 of the low-complexity domain (LCD) of TAF15 and was identical across four individuals.","method":"Cryo-EM structure determination of patient-extracted amyloid filaments","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 — direct structural determination from disease tissue, replicated across four individuals","pmids":["38057661"],"is_preprint":false},{"year":2023,"finding":"TAF15 bound directly to the FASN promoter to facilitate FASN expression (promoting hepatic steatosis), and interacted with p65 NF-κB to activate NF-κB signaling and increase proinflammatory cytokine secretion in NASH.","method":"ChIP-seq (CUT&Tag), dual-luciferase reporter, co-immunoprecipitation, immunofluorescence, AAV-mediated knockdown/overexpression in mice","journal":"Liver international","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP and reporter assays for promoter binding, co-IP for p65 interaction, in vivo model; single lab","pmids":["37183512"],"is_preprint":false},{"year":2024,"finding":"TAF15 is a nuclear PKA substrate; TAF15 phosphorylation by PKA alters its binding to target transcripts involved in mRNA maturation, splicing, and protein-binding functions, as demonstrated by iCLIP experiments comparing phosphorylated and unphosphorylated states.","method":"iCLIP (cross-linking immunoprecipitation), cAMP-PKA pathway activation, phosphorylation assays","journal":"Cellular and molecular life sciences","confidence":"Medium","confidence_rationale":"Tier 2 — direct identification of PKA as writer, iCLIP to map RNA-binding changes upon phosphorylation, single lab","pmids":["38568213"],"is_preprint":false},{"year":2018,"finding":"Parkin (E3 ubiquitin ligase) directly binds TAF15, and parkin overexpression reduces TAF15 protein levels through its E3 ubiquitin ligase activity. In a Drosophila model, parkin overexpression suppresses TAF15-induced neurotoxicity (lifespan defects, locomotive activity defects).","method":"Co-immunoprecipitation, in vivo Drosophila model, genetic rescue, ubiquitin ligase activity assays","journal":"Neurobiology of aging","confidence":"Medium","confidence_rationale":"Tier 2 — direct binding and E3 activity demonstrated with in vivo phenotypic rescue, Drosophila ortholog model","pmids":["30339961"],"is_preprint":false},{"year":2021,"finding":"Taf15 regulates dorsoanterior neural development in Xenopus through at least two mechanisms: (1) retention of a single fgfr4 intron (post-transcriptional/splicing regulation) when maternal+zygotic Taf15 is depleted, and (2) reduction in total fgfr4 transcript (transcriptional regulation) when only zygotic Taf15 is depleted.","method":"Morpholino-mediated depletion, RNA-seq (exon usage and transcript abundance), Xenopus loss-of-function","journal":"Development (Cambridge, England)","confidence":"Medium","confidence_rationale":"Tier 2 — in vivo loss-of-function in Xenopus ortholog, genome-wide readout distinguishing two mechanisms; ortholog study","pmids":["34345915"],"is_preprint":false},{"year":2008,"finding":"FUS and TAF15 proteins were detected in spreading initiation centers of adhering cells and are targeted to stress granules induced by heat shock and oxidative stress. FUS requires its RNA-binding domain for translocation to stress granules.","method":"Immunofluorescence, live cell imaging, stress granule induction assays, domain deletion analysis","journal":"BMC cell biology","confidence":"Medium","confidence_rationale":"Tier 3 — immunolocalization with functional inference; direct domain mapping only for FUS, not TAF15","pmids":["18620564"],"is_preprint":false}],"current_model":"TAF15 is a multifunctional nuclear RNA/ssDNA-binding protein of the FET family that associates with subpopulations of TFIID (via TBP) and RNA Polymerase II (including binding its CTD via amyloid-like LC domain fibrils) to participate in transcription initiation; binds ~4,900 RNAs enriched for GGUA motifs in neurons with roles in RNA stability and selective splicing regulation; forms a novel chromatin-associated snRNP with U1 snRNA; undergoes arginine methylation by PRMT1 and tyrosine phosphorylation by Src (both affecting function/localization), PKA phosphorylation altering RNA-binding specificity, caspase-3/7 cleavage, and multi-mono-ubiquitylation by TIF1γ (driving nuclear export); homo- and hetero-dimerizes with other FET proteins via a conserved N-terminal FETBM1 motif; and in disease, its low-complexity domain (residues 7–99) forms structurally defined amyloid filaments in FTLD patient brains."},"narrative":{"teleology":[{"year":1996,"claim":"Establishing TAF15 as a novel TBP-associated factor resolved the question of whether RNA-binding proteins participate directly in basal transcription complexes, placing TAF15 at the intersection of transcription initiation and RNA metabolism.","evidence":"Biochemical co-purification of hTAFII68 with TFIID and Pol II, RNA/ssDNA binding assays","pmids":["8890175"],"confidence":"High","gaps":["No determination of whether TAF15 is catalytically active within TFIID","Structural basis of TAF15–TBP interaction unknown at this stage"]},{"year":1998,"claim":"Demonstrating that TAF15 and EWS bind the same TFIID subunits in a mutually exclusive manner established that FET proteins occupy overlapping but distinct niches in the transcription machinery.","evidence":"In vitro binding studies with recombinant TFIID and Pol II subunits","pmids":["9488465"],"confidence":"High","gaps":["Physiological stoichiometry of TAF15- vs. EWS-containing TFIID not determined","No genome-wide identification of genes specifically dependent on TAF15-containing TFIID"]},{"year":2004,"claim":"Identification of Src-mediated tyrosine phosphorylation of TAF15, which stimulates its transactivation function, revealed that signal transduction pathways directly modulate TAF15 transcriptional activity.","evidence":"In vitro/in vivo kinase assays, co-IP with SH3 domains, reporter assays","pmids":["15094065"],"confidence":"Medium","gaps":["Specific phosphorylated residues not mapped","Physiological relevance of v-Src versus c-Src in normal cells unclear"]},{"year":2008,"claim":"Discovery that PRMT1 methylates TAF15 RGG repeats and that this modification controls subcellular localization and target gene expression established arginine methylation as a key regulatory switch for TAF15 function.","evidence":"In vivo methylation, co-IP with PRMT1, subcellular fractionation, gene expression profiling","pmids":["19124016"],"confidence":"High","gaps":["Individual methylated arginine sites not fully mapped","Downstream effectors reading TAF15 methylation marks unidentified"]},{"year":2008,"claim":"Localization of TAF15 to stress granules upon heat shock and oxidative stress, and to spreading initiation centers, revealed cytoplasmic roles beyond nuclear transcription.","evidence":"Immunofluorescence, live cell imaging under stress conditions","pmids":["18620564"],"confidence":"Medium","gaps":["Domain requirements for TAF15 stress-granule targeting not mapped (only FUS was dissected)","Functional consequence of TAF15 in stress granules not determined"]},{"year":2009,"claim":"Identification of a novel chromatin-associated U1-TAF15 snRNP, distinct from canonical spliceosomal U1 snRNP, opened the question of non-canonical snRNP functions and showed TAF15 can reorganize snRNA into alternative complexes.","evidence":"Reciprocal co-IPs, RNA co-precipitation, fluorescence microscopy, transcriptional inhibition","pmids":["19282884"],"confidence":"High","gaps":["Function of U1-TAF15 snRNP on chromatin unknown","Whether U1-TAF15 particle has any role in splicing versus transcription unresolved"]},{"year":2009,"claim":"Mapping caspase-3/7 cleavage of TAF15 at 106DQPD/Y110 showed that TAF15 is proteolytically processed during apoptosis, potentially separating its LC domain from RNA-binding functions.","evidence":"In vitro caspase cleavage, site-directed mutagenesis, cell-based apoptosis","pmids":["19426707"],"confidence":"Medium","gaps":["Biological consequence of caspase cleavage fragments not characterized","Whether cleavage contributes to disease-associated aggregation unknown"]},{"year":2011,"claim":"Demonstrating Transportin-dependent nuclear import of TAF15 and its accumulation in cytoplasmic inclusions when import is blocked linked FET protein mislocalization to neurodegenerative disease mechanisms, and TAF15 was found in FTLD but not ALS-FUS inclusions.","evidence":"Transportin inhibition, immunohistochemistry of FTLD/ALS tissue, immunoblot of insoluble fractions","pmids":["21856723","22771914"],"confidence":"Medium","gaps":["Whether TAF15 NLS mutations are causative in human FTLD not established","Mechanism converting cytoplasmic mislocalization to toxicity unknown"]},{"year":2012,"claim":"Loss-of-function experiments revealed that TAF15 promotes cell proliferation and suppresses apoptosis through a miRNA-mediated pathway: TAF15 sustains miR-17/20a levels, thereby repressing CDKN1A/p21.","evidence":"siRNA knockdown, gene expression profiling, miRNA quantification, flow cytometry","pmids":["23128393"],"confidence":"Medium","gaps":["Whether TAF15 directly binds or stabilizes pri-miR-17 transcript not shown","Generalizability beyond the cell lines tested not established"]},{"year":2013,"claim":"Genome-wide CLIP-seq in brain tissue identified conserved TAF15 RNA targets and demonstrated regulation of Grin1 splicing, directly linking TAF15 to neuronal RNA processing and NMDA receptor function.","evidence":"iCLIP, RNA-seq with TAF15 knockdown in mouse neurons and human brain","pmids":["23416048"],"confidence":"High","gaps":["Functional consequence of Grin1 mis-splicing on neuronal physiology not tested","Redundancy between TAF15 and FUS in splicing regulation not fully resolved"]},{"year":2013,"claim":"Identification of the FETBM1 motif mediating RNA/DNA-independent homo- and hetero-dimerization among FET proteins established a structural basis for FET protein complex formation and explained how oncogenic fusion proteins sequester wild-type FET proteins.","evidence":"Recombinant protein pulldowns, mass spectrometry, motif mutagenesis","pmids":["23975937"],"confidence":"High","gaps":["Stoichiometry and structure of FET complexes in vivo unknown","Whether FETBM1-mediated dimerization is regulated by post-translational modifications not tested"]},{"year":2015,"claim":"NMR structure of the TAF15 RRM revealed a non-canonical RNA recognition mode using hydrogen bonding on a concave surface rather than classical aromatic stacking, explaining structure-dependent rather than sequence-dependent RNA binding.","evidence":"Solution NMR, calorimetry, molecular dynamics, RNA variant binding assays","pmids":["26612539"],"confidence":"High","gaps":["No full-length TAF15–RNA structure available","How RRM and RGG domains cooperate in target recognition not resolved"]},{"year":2016,"claim":"Comprehensive CLIP-seq and RNA Bind-N-Seq refined the TAF15 binding landscape to ~4,900 RNAs with GGUA motif enrichment and revealed that, unlike FUS, TAF15 primarily affects RNA turnover rather than alternative splicing in neural progenitors.","evidence":"CLIP-seq, RNA Bind-N-Seq, RNA-seq in mouse brain and human neural progenitors","pmids":["27378374"],"confidence":"High","gaps":["Mechanism by which TAF15 controls RNA stability (direct degradation vs. indirect) unknown","Discrepancy with earlier splicing findings in neurons not fully reconciled"]},{"year":2017,"claim":"Demonstration that TAF15 LC domain fibrils bind Pol II CTD heptads, with lysine-7 contributing electrostatic contacts, provided a molecular mechanism linking TAF15 phase behavior to transcription machinery recruitment.","evidence":"NMR, hydrogel FRAP, CTD mutagenesis","pmids":["28945358"],"confidence":"High","gaps":["Whether fibril–CTD interaction occurs in living cells not confirmed","Relationship between pathological amyloid filaments and functional LC fibrils unclear"]},{"year":2018,"claim":"Parkin was identified as a second E3 ubiquitin ligase for TAF15, with parkin overexpression reducing TAF15 levels and suppressing TAF15-induced neurotoxicity in Drosophila, linking TAF15 turnover to Parkinson's-relevant quality control pathways.","evidence":"Co-IP, E3 activity assays, Drosophila genetic rescue","pmids":["30339961"],"confidence":"Medium","gaps":["Specific ubiquitylation sites on TAF15 by Parkin not mapped","Relevance to mammalian neurodegeneration not validated"]},{"year":2022,"claim":"TIF1γ was shown to multi-mono-ubiquitylate TAF15, driving its nuclear export and competing with TAF15 for TBP binding, thereby suppressing TAF15-dependent transcription (e.g., IL-6) and EMT/metastasis in lung adenocarcinoma.","evidence":"Competition assays, ubiquitylation assays, nuclear export assays, luciferase reporters, cell migration/invasion","pmids":["36261009"],"confidence":"High","gaps":["Ubiquitylated residues on TAF15 not mapped","Whether TIF1γ and Parkin target overlapping or distinct TAF15 pools unclear"]},{"year":2022,"claim":"TAF15 RGG domain was found to inhibit SRPK1 kinase activity, causing SR protein hypophosphorylation and splicing inhibition, revealing a non-RNA-binding mechanism by which TAF15 regulates splicing.","evidence":"Co-IP, kinase activity assays, reporter minigene splicing, immunofluorescence","pmids":["36611919"],"confidence":"Medium","gaps":["Whether endogenous TAF15 levels are sufficient to modulate SRPK1 in vivo not shown","Genome-wide splicing effects of TAF15-SRPK1 axis not profiled"]},{"year":2023,"claim":"Cryo-EM of FTLD-FUS patient brain filaments revealed they are composed of TAF15 (residues 7–99), not FUS, redefining the molecular identity of FTLD-FUS as a TAF15 amyloidosis and providing a structural template for the disease.","evidence":"Cryo-EM structure determination from four independent FTLD-FUS patient brains","pmids":["38057661"],"confidence":"High","gaps":["Whether TAF15 filament formation is a cause or consequence of neurodegeneration unknown","Conditions that seed TAF15 amyloid formation in vivo not identified"]},{"year":2024,"claim":"PKA was identified as a nuclear kinase that phosphorylates TAF15 and alters its RNA-binding profile, shifting target specificity toward transcripts involved in mRNA maturation and splicing.","evidence":"iCLIP comparing phosphorylated vs. unphosphorylated TAF15 upon cAMP-PKA activation","pmids":["38568213"],"confidence":"Medium","gaps":["Specific phosphorylated residues not identified","How PKA phosphorylation interacts with PRMT1 methylation or TIF1γ ubiquitylation unknown"]},{"year":null,"claim":"Major unresolved questions include the precise cellular function of the U1-TAF15 snRNP, the relationship between physiological LC-domain phase separation and pathological amyloid formation, and how multiple post-translational modifications (methylation, phosphorylation, ubiquitylation) are integrated to control TAF15 activity in different cell types.","evidence":"","pmids":[],"confidence":"High","gaps":["No reconstitution of U1-TAF15 snRNP function","No structure of full-length TAF15 or its complexes with TFIID","No systematic dissection of PTM crosstalk on TAF15"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[0,9,11,12,21]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[0,20]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,1,13,15,18]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[17]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,2,3,6,18]},{"term_id":"GO:0005730","term_label":"nucleolus","supporting_discovery_ids":[3]},{"term_id":"GO:0005694","term_label":"chromosome","supporting_discovery_ids":[3]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[5,6,24]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[0,1,13,18,20]},{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[9,12,17]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[2,14,18,22]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[19]}],"complexes":["TFIID (subpopulation)","U1-TAF15 snRNP","FET homo/heterodimers"],"partners":["TBP","PRMT1","TIF1Γ","PRKN","SRPK1","HNRNPM","SNRPC","RELA"],"other_free_text":[]},"mechanistic_narrative":"TAF15 is a multifunctional FET-family RNA/ssDNA-binding protein that participates in transcription initiation, RNA processing, and post-transcriptional gene regulation. It co-purifies with a subpopulation of TFIID (via TBP) and RNA Polymerase II, entering the preinitiation complex, and its low-complexity domain forms amyloid-like fibrils that bind the Pol II CTD [PMID:8890175, PMID:28945358]. TAF15 binds ~4,900 neuronal RNAs enriched for GGUA motifs via a structurally non-canonical RRM domain, regulating alternative splicing and RNA turnover, and forms a novel chromatin-associated U1-TAF15 snRNP distinct from spliceosomal U1 snRNP [PMID:27378374, PMID:26612539, PMID:19282884]. Its activity is controlled by arginine methylation (PRMT1), PKA phosphorylation that alters RNA-binding specificity, multi-mono-ubiquitylation by TIF1γ driving nuclear export, and Parkin-mediated ubiquitin-dependent degradation; cryo-EM of FTLD-FUS patient brains revealed that the disease-defining amyloid filaments are composed of TAF15 residues 7–99, not FUS [PMID:19124016, PMID:38568213, PMID:36261009, PMID:30339961, PMID:38057661]."},"prefetch_data":{"uniprot":{"accession":"Q92804","full_name":"TATA-binding protein-associated factor 2N","aliases":["68 kDa TATA-binding protein-associated factor","TAF(II)68","TAFII68","RNA-binding protein 56"],"length_aa":592,"mass_kda":61.8,"function":"RNA and ssDNA-binding protein that may play specific roles during transcription initiation at distinct promoters. Binds to ssRNA containing the consensus sequence 5'-AGGUAA-3' (PubMed:21256132). 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Greece)","url":"https://pubmed.ncbi.nlm.nih.gov/30150451","citation_count":8,"is_preprint":false},{"pmid":"33577675","id":"PMC_33577675","title":"The SR-protein Npl3 is an essential component of the meiotic splicing regulatory network in Saccharomyces cerevisiae.","date":"2021","source":"Nucleic acids research","url":"https://pubmed.ncbi.nlm.nih.gov/33577675","citation_count":7,"is_preprint":false},{"pmid":"37885911","id":"PMC_37885911","title":"NDRG1 promotes endothelial dysfunction and hypoxia-induced pulmonary hypertension by targeting TAF15.","date":"2023","source":"Precision clinical medicine","url":"https://pubmed.ncbi.nlm.nih.gov/37885911","citation_count":7,"is_preprint":false},{"pmid":"35527322","id":"PMC_35527322","title":"Identification of a novel translocation producing an in-frame fusion of TAF15 and ETV4 in a case of extraosseous Ewing sarcoma revealed in the prenatal period.","date":"2022","source":"Virchows Archiv : an international journal of pathology","url":"https://pubmed.ncbi.nlm.nih.gov/35527322","citation_count":7,"is_preprint":false},{"pmid":"28472517","id":"PMC_28472517","title":"The RNA binding protein Npl3 promotes resection of DNA double-strand breaks by regulating the levels of Exo1.","date":"2017","source":"Nucleic acids research","url":"https://pubmed.ncbi.nlm.nih.gov/28472517","citation_count":7,"is_preprint":false},{"pmid":"28392442","id":"PMC_28392442","title":"Protein arginine methylation of Npl3 promotes splicing of the SUS1 intron harboring non-consensus 5' splice site and branch site.","date":"2017","source":"Biochimica et biophysica acta. 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It contains a consensus RNA-binding domain (RNP-CS) and binds both RNA and single-stranded DNA.\",\n      \"method\": \"Biochemical co-purification, cloning and characterization, RNA/ssDNA binding assays\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — original discovery paper with multiple biochemical methods (co-purification, binding assays), highly cited foundational study\",\n      \"pmids\": [\"8890175\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"In vitro binding studies revealed that hTAFII68 (TAF15) interacts with specific TFIID subunits and with RNA Polymerase II subunits, and that EWS and hTAFII68 interact with the same TFIID subunits, suggesting their presence in TFIID is mutually exclusive.\",\n      \"method\": \"In vitro binding studies, co-immunoprecipitation, biochemical fractionation\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — direct in vitro binding assays with defined subunits, replicated and extended original findings\",\n      \"pmids\": [\"9488465\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Endogenous TAF15 is methylated in vivo at its RGG repeats by PRMT1 (identified as a TAF15 interactor and the major PRMT responsible). Methylation of RGG repeats affects subcellular localization and is required for TAF15 to positively regulate expression of its target genes.\",\n      \"method\": \"In vivo methylation assays, co-immunoprecipitation, subcellular fractionation, gene expression assays, loss-of-function\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (co-IP, subcellular fractionation, gene expression) in a single study demonstrating writer-substrate relationship and functional consequences\",\n      \"pmids\": [\"19124016\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"A fraction of human U1 snRNA specifically associates with TAF15 to form a novel chromatin-associated U1-TAF15 snRNP that is distinct from the spliceosomal U1-Sm snRNP; none of the known U1-Sm snRNP protein components interact with the U1-TAF15 particle. This particle accumulates in nucleolar caps upon transcriptional inhibition and its biogenesis depends on the Sm-binding motif of U1 snRNA.\",\n      \"method\": \"Immunoprecipitation, RNA co-precipitation, fluorescence microscopy, transcriptional inhibition experiments\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal co-IPs, RNA dependence tested, multiple orthogonal approaches\",\n      \"pmids\": [\"19282884\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"TAF15 associates with a subset of the spliceosomal U1 snRNP complex via direct protein-protein interaction between the N-terminal domain of TAF15 and U1C protein, as demonstrated by pulldown assays with recombinant proteins and immunoprecipitation of U1 snRNA and Sm proteins with TAF15 antibodies.\",\n      \"method\": \"Immunoprecipitation, pulldown with recombinant proteins, UV cross-linking, co-precipitation\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct protein-protein interaction demonstrated with recombinant proteins, single lab\",\n      \"pmids\": [\"22019700\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"All endogenous FET proteins (including TAF15) are recruited into cytoplasmic stress granules upon general inhibition of Transportin-mediated nuclear import, implicating Transportin-dependent nuclear import in maintaining TAF15 nuclear localization. TAF15 co-accumulates with FUS in FTLD inclusions but not in ALS-FUS inclusions.\",\n      \"method\": \"Cell culture experiments, Transportin inhibition, immunohistochemistry, immunoblot of insoluble fractions\",\n      \"journal\": \"Brain : a journal of neurology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct experimental manipulation (Transportin inhibition) with clear localization readout, single lab\",\n      \"pmids\": [\"21856723\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"The C-terminus of TAF15 contains a Transportin-dependent nuclear localization signal (NLS), and its RGG domain can be targeted to stress granules. TAF15 cellular localization depends on ongoing transcription, and TAF15 co-localizes with RNA granules in the cytoplasm of neuronal HT22 cells in a cell-type-dependent manner.\",\n      \"method\": \"Domain deletion and mutagenesis, live imaging, immunofluorescence, transcriptional inhibition\",\n      \"journal\": \"Gene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct experimental domain mapping with functional localization consequences, single lab\",\n      \"pmids\": [\"22771914\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"TAF15 knockdown reduces cellular proliferation and increases apoptosis. TAF15 regulates expression of cell cycle genes post-transcriptionally through a miRNA pathway: TAF15 depletion decreases levels of onco-miR-17 locus miRNAs (miR-17-5p and miR-20a), leading to upregulation of CDKN1A/p21.\",\n      \"method\": \"siRNA knockdown, global gene expression profiling, miRNA analysis, flow cytometry\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — loss-of-function with defined molecular pathway, multiple readouts, single lab\",\n      \"pmids\": [\"23128393\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"FUS, EWSR1, and TAF15 form homo- and heterocomplexes via a conserved N-terminal motif (FETBM1). This interaction is RNA- and DNA-independent and robust under high-salt conditions. The FETBM1 motif is required for complex formation and also for binding of normal full-length FET proteins to their oncogenic fusion proteins.\",\n      \"method\": \"Pulldown with recombinant proteins, mass spectrometry, mutagenesis\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — reconstitution with recombinant proteins, mutagenesis of defined motif, multiple orthogonal methods\",\n      \"pmids\": [\"23975937\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"CLIP-seq and RNA-seq in human brain and mouse neurons identified conserved TAF15 RNA binding targets; TAF15 regulates alternative splicing of neuronal RNAs, including a critical splicing event in the Grin1 (NMDA receptor zeta-1 subunit) transcript that controls NR1 activity and trafficking.\",\n      \"method\": \"CLIP-seq (iCLIP), RNA-seq, TAF15 knockdown\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — in vivo crosslinking, genome-wide profiling, and loss-of-function with defined splicing phenotype\",\n      \"pmids\": [\"23416048\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"TAF15 co-immunoprecipitates preferentially with hnRNP M3/4 isoforms (higher MW), while TLS/FUS associates with hnRNP M1/2 (lower MW), via direct protein-protein interactions through the amino-termini of the TET proteins, independently of RNA.\",\n      \"method\": \"Immunoprecipitation, pulldown with recombinant proteins, co-localization\",\n      \"journal\": \"Molecular biology reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — direct protein interaction demonstrated, single lab\",\n      \"pmids\": [\"24474660\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"NMR structure of the TAF15 RRM domain reveals a non-canonical mode of RNA recognition: binding to stem-loop RNA is mediated primarily by hydrogen bonding between RNA bases and a concave face on the RRM surface rather than classical stacking interactions at RNP sites. RNA binding is dependent on structural elements in the RNA rather than sequence alone.\",\n      \"method\": \"Solution NMR spectroscopy, calorimetry, docking, molecular dynamics simulation\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — structure determination with functional validation (binding affinity measurements across RNA variants)\",\n      \"pmids\": [\"26612539\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CLIP-seq and RNA Bind-N-Seq in mouse brains showed TAF15 binds ~4,900 RNAs enriched for GGUA motifs. TAF15 and FUS show similar binding in introns and 3'UTRs, but unlike FUS and TDP-43, TAF15 has a minimal role in alternative splicing. In human neural progenitors, TAF15 and FUS affect RNA target turnover.\",\n      \"method\": \"CLIP-seq, RNA Bind-N-Seq, RNA-seq, loss-of-function in multiple cell types\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — two independent genome-wide technologies, validated in multiple cell systems\",\n      \"pmids\": [\"27378374\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"TAF15 low-complexity (LC) domain forms amyloid-like fibrils that bind RNA Pol II CTD. NMR and fluorescence microscopy (FRAP) showed the interaction involves heptads throughout CTD, with lysines at position 7 contributing through electrostatic interactions; mutation of these lysines to consensus serines reduced binding.\",\n      \"method\": \"NMR spectroscopy, hydrogel fluorescence microscopy, FRAP, mutagenesis\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — NMR structure/interaction data, FRAP, mutagenesis in one study\",\n      \"pmids\": [\"28945358\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"PRMT1 shows differential interaction with RGG-boxes of TAF15 compared to FUS and EWS. The Asp residue in TAF15's YGGDR(S/G)G repeats confers poor binding to PRMT1, suggesting reduced overall methylation of TAF15 compared to other FET proteins and contributing to TAF15 functional specialization.\",\n      \"method\": \"Peptide-based binding assays, novel 2-hybrid binding assay, mutagenesis\",\n      \"journal\": \"Protein science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — biochemical binding assays with defined peptide substrates and mutagenesis, single lab\",\n      \"pmids\": [\"29193371\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"TAF15 (hTAFII68) is phosphorylated on tyrosine residue(s) by v-Src kinase in vitro and in vivo, and TAF15 associates with SH3 domains of v-Src and other cell signaling proteins. v-Src stimulates TAF15-mediated transcriptional activation, while dominant-negative Src reduces TAF15 transactivation function.\",\n      \"method\": \"In vitro kinase assays, in vivo tyrosine phosphorylation, co-immunoprecipitation with SH3 domains, transactivation reporter assays\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vitro and in vivo phosphorylation combined with functional reporter assay, single lab\",\n      \"pmids\": [\"15094065\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"TAF15 and the leukemia-associated fusion protein TAF15-CIZ/NMP4 are specifically cleaved by caspases-3 and -7 at the consensus sequence 106DQPD/Y110 as identified by mutagenesis.\",\n      \"method\": \"In vitro caspase cleavage assays, site-directed mutagenesis, cell-based apoptosis assays\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 — in vitro cleavage with mutagenesis to map site, demonstrated in cells\",\n      \"pmids\": [\"19426707\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"TAF15 C-terminal RGG domain associates with SRPK1 and inhibits its kinase activity, causing partial relocalization of SRPK1 to the nucleus, hypophosphorylation of SR proteins, inhibition of splicing of a reporter minigene, and inhibition of Lamin B receptor phosphorylation.\",\n      \"method\": \"Co-immunoprecipitation, kinase activity assays, overexpression, reporter minigene splicing assay, immunofluorescence\",\n      \"journal\": \"Cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct interaction and functional consequences via multiple assays, single lab\",\n      \"pmids\": [\"36611919\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"TIF1γ binds TBP in competition with TAF15 and impedes TAF15/TBP-mediated IL-6 transactivation. TIF1γ modifies TAF15 through multi-mono-ubiquitylation and drives nuclear export of TAF15, thereby inhibiting TAF15-promoted EMT and metastasis in lung adenocarcinoma cells.\",\n      \"method\": \"Co-immunoprecipitation, competition assays, luciferase reporter, ubiquitylation assays, immunofluorescence, nuclear export assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods identifying modifier (TIF1γ), substrate (TAF15), mechanism (ubiquitylation and nuclear export), and functional consequence\",\n      \"pmids\": [\"36261009\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Cryo-EM structures of amyloid filaments extracted from FTLD-FUS patient brains show that the filaments are composed of TAF15, not FUS. The filament fold is formed from residues 7-99 of the low-complexity domain (LCD) of TAF15 and was identical across four individuals.\",\n      \"method\": \"Cryo-EM structure determination of patient-extracted amyloid filaments\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct structural determination from disease tissue, replicated across four individuals\",\n      \"pmids\": [\"38057661\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"TAF15 bound directly to the FASN promoter to facilitate FASN expression (promoting hepatic steatosis), and interacted with p65 NF-κB to activate NF-κB signaling and increase proinflammatory cytokine secretion in NASH.\",\n      \"method\": \"ChIP-seq (CUT&Tag), dual-luciferase reporter, co-immunoprecipitation, immunofluorescence, AAV-mediated knockdown/overexpression in mice\",\n      \"journal\": \"Liver international\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP and reporter assays for promoter binding, co-IP for p65 interaction, in vivo model; single lab\",\n      \"pmids\": [\"37183512\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"TAF15 is a nuclear PKA substrate; TAF15 phosphorylation by PKA alters its binding to target transcripts involved in mRNA maturation, splicing, and protein-binding functions, as demonstrated by iCLIP experiments comparing phosphorylated and unphosphorylated states.\",\n      \"method\": \"iCLIP (cross-linking immunoprecipitation), cAMP-PKA pathway activation, phosphorylation assays\",\n      \"journal\": \"Cellular and molecular life sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct identification of PKA as writer, iCLIP to map RNA-binding changes upon phosphorylation, single lab\",\n      \"pmids\": [\"38568213\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Parkin (E3 ubiquitin ligase) directly binds TAF15, and parkin overexpression reduces TAF15 protein levels through its E3 ubiquitin ligase activity. In a Drosophila model, parkin overexpression suppresses TAF15-induced neurotoxicity (lifespan defects, locomotive activity defects).\",\n      \"method\": \"Co-immunoprecipitation, in vivo Drosophila model, genetic rescue, ubiquitin ligase activity assays\",\n      \"journal\": \"Neurobiology of aging\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct binding and E3 activity demonstrated with in vivo phenotypic rescue, Drosophila ortholog model\",\n      \"pmids\": [\"30339961\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Taf15 regulates dorsoanterior neural development in Xenopus through at least two mechanisms: (1) retention of a single fgfr4 intron (post-transcriptional/splicing regulation) when maternal+zygotic Taf15 is depleted, and (2) reduction in total fgfr4 transcript (transcriptional regulation) when only zygotic Taf15 is depleted.\",\n      \"method\": \"Morpholino-mediated depletion, RNA-seq (exon usage and transcript abundance), Xenopus loss-of-function\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo loss-of-function in Xenopus ortholog, genome-wide readout distinguishing two mechanisms; ortholog study\",\n      \"pmids\": [\"34345915\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"FUS and TAF15 proteins were detected in spreading initiation centers of adhering cells and are targeted to stress granules induced by heat shock and oxidative stress. FUS requires its RNA-binding domain for translocation to stress granules.\",\n      \"method\": \"Immunofluorescence, live cell imaging, stress granule induction assays, domain deletion analysis\",\n      \"journal\": \"BMC cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — immunolocalization with functional inference; direct domain mapping only for FUS, not TAF15\",\n      \"pmids\": [\"18620564\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TAF15 is a multifunctional nuclear RNA/ssDNA-binding protein of the FET family that associates with subpopulations of TFIID (via TBP) and RNA Polymerase II (including binding its CTD via amyloid-like LC domain fibrils) to participate in transcription initiation; binds ~4,900 RNAs enriched for GGUA motifs in neurons with roles in RNA stability and selective splicing regulation; forms a novel chromatin-associated snRNP with U1 snRNA; undergoes arginine methylation by PRMT1 and tyrosine phosphorylation by Src (both affecting function/localization), PKA phosphorylation altering RNA-binding specificity, caspase-3/7 cleavage, and multi-mono-ubiquitylation by TIF1γ (driving nuclear export); homo- and hetero-dimerizes with other FET proteins via a conserved N-terminal FETBM1 motif; and in disease, its low-complexity domain (residues 7–99) forms structurally defined amyloid filaments in FTLD patient brains.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"TAF15 is a multifunctional FET-family RNA/ssDNA-binding protein that participates in transcription initiation, RNA processing, and post-transcriptional gene regulation. It co-purifies with a subpopulation of TFIID (via TBP) and RNA Polymerase II, entering the preinitiation complex, and its low-complexity domain forms amyloid-like fibrils that bind the Pol II CTD [PMID:8890175, PMID:28945358]. TAF15 binds ~4,900 neuronal RNAs enriched for GGUA motifs via a structurally non-canonical RRM domain, regulating alternative splicing and RNA turnover, and forms a novel chromatin-associated U1-TAF15 snRNP distinct from spliceosomal U1 snRNP [PMID:27378374, PMID:26612539, PMID:19282884]. Its activity is controlled by arginine methylation (PRMT1), PKA phosphorylation that alters RNA-binding specificity, multi-mono-ubiquitylation by TIF1γ driving nuclear export, and Parkin-mediated ubiquitin-dependent degradation; cryo-EM of FTLD-FUS patient brains revealed that the disease-defining amyloid filaments are composed of TAF15 residues 7–99, not FUS [PMID:19124016, PMID:38568213, PMID:36261009, PMID:30339961, PMID:38057661].\",\n  \"teleology\": [\n    {\n      \"year\": 1996,\n      \"claim\": \"Establishing TAF15 as a novel TBP-associated factor resolved the question of whether RNA-binding proteins participate directly in basal transcription complexes, placing TAF15 at the intersection of transcription initiation and RNA metabolism.\",\n      \"evidence\": \"Biochemical co-purification of hTAFII68 with TFIID and Pol II, RNA/ssDNA binding assays\",\n      \"pmids\": [\"8890175\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No determination of whether TAF15 is catalytically active within TFIID\", \"Structural basis of TAF15–TBP interaction unknown at this stage\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Demonstrating that TAF15 and EWS bind the same TFIID subunits in a mutually exclusive manner established that FET proteins occupy overlapping but distinct niches in the transcription machinery.\",\n      \"evidence\": \"In vitro binding studies with recombinant TFIID and Pol II subunits\",\n      \"pmids\": [\"9488465\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological stoichiometry of TAF15- vs. EWS-containing TFIID not determined\", \"No genome-wide identification of genes specifically dependent on TAF15-containing TFIID\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Identification of Src-mediated tyrosine phosphorylation of TAF15, which stimulates its transactivation function, revealed that signal transduction pathways directly modulate TAF15 transcriptional activity.\",\n      \"evidence\": \"In vitro/in vivo kinase assays, co-IP with SH3 domains, reporter assays\",\n      \"pmids\": [\"15094065\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Specific phosphorylated residues not mapped\", \"Physiological relevance of v-Src versus c-Src in normal cells unclear\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Discovery that PRMT1 methylates TAF15 RGG repeats and that this modification controls subcellular localization and target gene expression established arginine methylation as a key regulatory switch for TAF15 function.\",\n      \"evidence\": \"In vivo methylation, co-IP with PRMT1, subcellular fractionation, gene expression profiling\",\n      \"pmids\": [\"19124016\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Individual methylated arginine sites not fully mapped\", \"Downstream effectors reading TAF15 methylation marks unidentified\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Localization of TAF15 to stress granules upon heat shock and oxidative stress, and to spreading initiation centers, revealed cytoplasmic roles beyond nuclear transcription.\",\n      \"evidence\": \"Immunofluorescence, live cell imaging under stress conditions\",\n      \"pmids\": [\"18620564\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Domain requirements for TAF15 stress-granule targeting not mapped (only FUS was dissected)\", \"Functional consequence of TAF15 in stress granules not determined\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Identification of a novel chromatin-associated U1-TAF15 snRNP, distinct from canonical spliceosomal U1 snRNP, opened the question of non-canonical snRNP functions and showed TAF15 can reorganize snRNA into alternative complexes.\",\n      \"evidence\": \"Reciprocal co-IPs, RNA co-precipitation, fluorescence microscopy, transcriptional inhibition\",\n      \"pmids\": [\"19282884\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Function of U1-TAF15 snRNP on chromatin unknown\", \"Whether U1-TAF15 particle has any role in splicing versus transcription unresolved\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Mapping caspase-3/7 cleavage of TAF15 at 106DQPD/Y110 showed that TAF15 is proteolytically processed during apoptosis, potentially separating its LC domain from RNA-binding functions.\",\n      \"evidence\": \"In vitro caspase cleavage, site-directed mutagenesis, cell-based apoptosis\",\n      \"pmids\": [\"19426707\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Biological consequence of caspase cleavage fragments not characterized\", \"Whether cleavage contributes to disease-associated aggregation unknown\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Demonstrating Transportin-dependent nuclear import of TAF15 and its accumulation in cytoplasmic inclusions when import is blocked linked FET protein mislocalization to neurodegenerative disease mechanisms, and TAF15 was found in FTLD but not ALS-FUS inclusions.\",\n      \"evidence\": \"Transportin inhibition, immunohistochemistry of FTLD/ALS tissue, immunoblot of insoluble fractions\",\n      \"pmids\": [\"21856723\", \"22771914\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether TAF15 NLS mutations are causative in human FTLD not established\", \"Mechanism converting cytoplasmic mislocalization to toxicity unknown\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Loss-of-function experiments revealed that TAF15 promotes cell proliferation and suppresses apoptosis through a miRNA-mediated pathway: TAF15 sustains miR-17/20a levels, thereby repressing CDKN1A/p21.\",\n      \"evidence\": \"siRNA knockdown, gene expression profiling, miRNA quantification, flow cytometry\",\n      \"pmids\": [\"23128393\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether TAF15 directly binds or stabilizes pri-miR-17 transcript not shown\", \"Generalizability beyond the cell lines tested not established\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Genome-wide CLIP-seq in brain tissue identified conserved TAF15 RNA targets and demonstrated regulation of Grin1 splicing, directly linking TAF15 to neuronal RNA processing and NMDA receptor function.\",\n      \"evidence\": \"iCLIP, RNA-seq with TAF15 knockdown in mouse neurons and human brain\",\n      \"pmids\": [\"23416048\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of Grin1 mis-splicing on neuronal physiology not tested\", \"Redundancy between TAF15 and FUS in splicing regulation not fully resolved\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Identification of the FETBM1 motif mediating RNA/DNA-independent homo- and hetero-dimerization among FET proteins established a structural basis for FET protein complex formation and explained how oncogenic fusion proteins sequester wild-type FET proteins.\",\n      \"evidence\": \"Recombinant protein pulldowns, mass spectrometry, motif mutagenesis\",\n      \"pmids\": [\"23975937\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry and structure of FET complexes in vivo unknown\", \"Whether FETBM1-mediated dimerization is regulated by post-translational modifications not tested\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"NMR structure of the TAF15 RRM revealed a non-canonical RNA recognition mode using hydrogen bonding on a concave surface rather than classical aromatic stacking, explaining structure-dependent rather than sequence-dependent RNA binding.\",\n      \"evidence\": \"Solution NMR, calorimetry, molecular dynamics, RNA variant binding assays\",\n      \"pmids\": [\"26612539\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No full-length TAF15–RNA structure available\", \"How RRM and RGG domains cooperate in target recognition not resolved\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Comprehensive CLIP-seq and RNA Bind-N-Seq refined the TAF15 binding landscape to ~4,900 RNAs with GGUA motif enrichment and revealed that, unlike FUS, TAF15 primarily affects RNA turnover rather than alternative splicing in neural progenitors.\",\n      \"evidence\": \"CLIP-seq, RNA Bind-N-Seq, RNA-seq in mouse brain and human neural progenitors\",\n      \"pmids\": [\"27378374\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which TAF15 controls RNA stability (direct degradation vs. indirect) unknown\", \"Discrepancy with earlier splicing findings in neurons not fully reconciled\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Demonstration that TAF15 LC domain fibrils bind Pol II CTD heptads, with lysine-7 contributing electrostatic contacts, provided a molecular mechanism linking TAF15 phase behavior to transcription machinery recruitment.\",\n      \"evidence\": \"NMR, hydrogel FRAP, CTD mutagenesis\",\n      \"pmids\": [\"28945358\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether fibril–CTD interaction occurs in living cells not confirmed\", \"Relationship between pathological amyloid filaments and functional LC fibrils unclear\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Parkin was identified as a second E3 ubiquitin ligase for TAF15, with parkin overexpression reducing TAF15 levels and suppressing TAF15-induced neurotoxicity in Drosophila, linking TAF15 turnover to Parkinson's-relevant quality control pathways.\",\n      \"evidence\": \"Co-IP, E3 activity assays, Drosophila genetic rescue\",\n      \"pmids\": [\"30339961\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Specific ubiquitylation sites on TAF15 by Parkin not mapped\", \"Relevance to mammalian neurodegeneration not validated\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"TIF1γ was shown to multi-mono-ubiquitylate TAF15, driving its nuclear export and competing with TAF15 for TBP binding, thereby suppressing TAF15-dependent transcription (e.g., IL-6) and EMT/metastasis in lung adenocarcinoma.\",\n      \"evidence\": \"Competition assays, ubiquitylation assays, nuclear export assays, luciferase reporters, cell migration/invasion\",\n      \"pmids\": [\"36261009\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Ubiquitylated residues on TAF15 not mapped\", \"Whether TIF1γ and Parkin target overlapping or distinct TAF15 pools unclear\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"TAF15 RGG domain was found to inhibit SRPK1 kinase activity, causing SR protein hypophosphorylation and splicing inhibition, revealing a non-RNA-binding mechanism by which TAF15 regulates splicing.\",\n      \"evidence\": \"Co-IP, kinase activity assays, reporter minigene splicing, immunofluorescence\",\n      \"pmids\": [\"36611919\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether endogenous TAF15 levels are sufficient to modulate SRPK1 in vivo not shown\", \"Genome-wide splicing effects of TAF15-SRPK1 axis not profiled\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Cryo-EM of FTLD-FUS patient brain filaments revealed they are composed of TAF15 (residues 7–99), not FUS, redefining the molecular identity of FTLD-FUS as a TAF15 amyloidosis and providing a structural template for the disease.\",\n      \"evidence\": \"Cryo-EM structure determination from four independent FTLD-FUS patient brains\",\n      \"pmids\": [\"38057661\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether TAF15 filament formation is a cause or consequence of neurodegeneration unknown\", \"Conditions that seed TAF15 amyloid formation in vivo not identified\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"PKA was identified as a nuclear kinase that phosphorylates TAF15 and alters its RNA-binding profile, shifting target specificity toward transcripts involved in mRNA maturation and splicing.\",\n      \"evidence\": \"iCLIP comparing phosphorylated vs. unphosphorylated TAF15 upon cAMP-PKA activation\",\n      \"pmids\": [\"38568213\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Specific phosphorylated residues not identified\", \"How PKA phosphorylation interacts with PRMT1 methylation or TIF1γ ubiquitylation unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Major unresolved questions include the precise cellular function of the U1-TAF15 snRNP, the relationship between physiological LC-domain phase separation and pathological amyloid formation, and how multiple post-translational modifications (methylation, phosphorylation, ubiquitylation) are integrated to control TAF15 activity in different cell types.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No reconstitution of U1-TAF15 snRNP function\", \"No structure of full-length TAF15 or its complexes with TFIID\", \"No systematic dissection of PTM crosstalk on TAF15\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [0, 9, 11, 12, 21]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [0, 20]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 1, 13, 15, 18]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [17]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 2, 3, 6, 18]},\n      {\"term_id\": \"GO:0005730\", \"supporting_discovery_ids\": [3]},\n      {\"term_id\": \"GO:0005694\", \"supporting_discovery_ids\": [3]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [5, 6, 24]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [0, 1, 13, 18, 20]},\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [9, 12, 17]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [2, 14, 18, 22]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [19]}\n    ],\n    \"complexes\": [\n      \"TFIID (subpopulation)\",\n      \"U1-TAF15 snRNP\",\n      \"FET homo/heterodimers\"\n    ],\n    \"partners\": [\n      \"TBP\",\n      \"PRMT1\",\n      \"TIF1γ\",\n      \"PRKN\",\n      \"SRPK1\",\n      \"HNRNPM\",\n      \"SNRPC\",\n      \"RELA\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}