{"gene":"NCOA4","run_date":"2026-06-10T05:19:52","timeline":{"discoveries":[{"year":2014,"finding":"NCOA4 was identified as a selective cargo receptor for autophagic turnover of ferritin (ferritinophagy): it associates with ATG8 proteins, binds ferritin heavy and light chains, and is required for delivery of ferritin to lysosomes. NCOA4-deficient cells cannot degrade ferritin, leading to decreased bioavailable intracellular iron.","method":"Quantitative autophagosome proteomics, co-immunoprecipitation of NCOA4 with ferritin subunits, NCOA4 knockdown/knockout with ferritin degradation and iron bioavailability readouts","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP and KO with defined cellular phenotype; widely replicated across many subsequent labs","pmids":["24695223"],"is_preprint":false},{"year":2015,"finding":"Direct physical interaction between NCOA4 and FTH1 requires a key surface arginine in FTH1 and a C-terminal element in NCOA4, and is necessary for ferritin delivery to lysosomes via autophagosomes. NCOA4 protein abundance is dually controlled by autophagy and the ubiquitin-proteasome system; under excess iron, HERC2 ubiquitin ligase binds NCOA4 in an iron-dependent manner and promotes its proteasomal degradation, thereby suppressing ferritinophagy.","method":"Mutagenesis of FTH1 and NCOA4 interaction interface, Co-IP, depletion-reconstitution, ubiquitination assays, zebrafish genetic model","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — multiple orthogonal methods (mutagenesis, Co-IP, in vivo zebrafish), replicated by subsequent papers","pmids":["26436293"],"is_preprint":false},{"year":2016,"finding":"NCOA4 knockout mice show iron accumulation in liver and spleen, elevated transferrin saturation and serum ferritin, and mild microcytic hypochromic anemia; under iron-deprivation or iron-enriched diets, phenotypes are dramatically exacerbated, establishing NCOA4 as essential for systemic iron homeostasis in vivo. Expression of the NCOA4 C-terminal domain (aa 239–614) restores impaired autophagic ferritin targeting in null MEFs.","method":"Knockout mouse model, dietary iron manipulation, primary MEF ferritin degradation assay, domain reconstitution","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo KO with defined phenotypic readouts and domain reconstitution; replicated by other KO studies","pmids":["26776506"],"is_preprint":false},{"year":2017,"finding":"In developing erythroid cells, NCOA4-mediated ferritinophagy is required for iron flux through ferritin to mitochondria for heme synthesis; NCOA4 depletion impairs iron trafficking through ferritin, reducing heme synthesis and hemoglobin formation. PCBP1 loads iron into ferritin while NCOA4 mediates autophagic release, coordinating vectorial iron transfer.","method":"siRNA depletion of NCOA4 and PCBP1 in cultured erythroid differentiation model, Pcbp1-KO mouse ex vivo erythroid differentiation, heme/hemoglobin assays","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO in mice plus in vitro depletion with functional iron/heme readouts; independently consistent with other erythropoiesis papers","pmids":["28375153"],"is_preprint":false},{"year":2017,"finding":"The ferritin-binding domain of NCOA4 (residues 383–522) forms a soluble dimer with low secondary structure, binds H-ferritin (FTH1) with nM affinity but not the R23A FTH1 mutant or L-ferritin, and Fe(II) partially inhibits this binding. Each ferritin shell can bind up to 24 NCOA4 fragments, forming highly stable and insoluble complexes.","method":"Recombinant expression of NCOA4(383-522) in E. coli, electrophoretic mobility shift assay, ELISA binding assay, CD spectroscopy, metal-ion competition","journal":"Biochimica et biophysica acta. General subjects","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro biochemical reconstitution with mutagenesis and multiple assays in single lab","pmids":["28754384"],"is_preprint":false},{"year":2019,"finding":"Ncoa4 has both cell-autonomous (erythroid) and non-cell-autonomous (macrophage/systemic) roles in erythropoiesis. Acute systemic Ncoa4 KO causes tissue ferritin/iron accumulation and anemia; erythroid-specific KO produces postnatal anemia and hypochromic microcytic anemia; macrophage ferritinophagy is a major route for iron release supporting erythropoiesis, especially under iron deficiency.","method":"Inducible systemic KO mouse model, erythroid-specific conditional KO, bone marrow transplantation, hematological and iron parameter readouts","journal":"Haematologica","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple conditional KO models with cell-type-specific phenotypic dissection","pmids":["30630985"],"is_preprint":false},{"year":2020,"finding":"Using isothermal titration calorimetry, NCOA4(383-522) binds H-rich ferritins with Kd ~0.4 µM (homopolymer) and ~2 µM (heteropolymer), with ~8 NCOA4 molecules per ferritin shell; binding is enthalpically and entropically favored. NCOA4 binding inhibits iron mobilization from ferritin by reducing agents (FMN/NADH, sodium dithionite) in a concentration-dependent manner, suggesting interference with electron transfer through the ferritin shell.","method":"Isothermal titration calorimetry, iron oxidation/mobilization kinetic assays in vitro with recombinant proteins","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with thermodynamic and kinetic measurements, single lab with multiple methods","pmids":["32608971"],"is_preprint":false},{"year":2021,"finding":"Macrophage-specific NCOA4-mediated ferritinophagy is a major route for iron release to support systemic erythropoiesis; Ncoa4-KO bone marrow transplants into wild-type recipients reveal iron retention in spleen macrophages and failure to mobilize iron stores in response to erythropoietin.","method":"Reciprocal bone marrow transplantation in Ncoa4-KO mice, iron deficiency diet, erythropoietin challenge, hematological readouts","journal":"Haematologica","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal transplantation experiment with cell-type-specific iron mobilization readouts","pmids":["32107334"],"is_preprint":false},{"year":2021,"finding":"NCOA4 drives phase separation/liquid-like condensate formation of ferritin particles via homodimerization of NCOA4 and multivalent FTH1–NCOA4 interactions; these condensates are directly engulfed by autophagosomes and endosomes (macroferritinophagy and microferritinophagy). Disruption of NCOA4 homodimerization or FTH1-binding interface impairs both condensate formation and ferritin degradation. TAX1BP1 is required for condensate incorporation into autophagosomes/endosomes but not for condensate formation.","method":"Live-cell imaging, 3D correlative light-electron microscopy, NCOA4 dimerization and FTH1-interaction mutants, autophagy/endosome incorporation assays","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — reconstitution and structural imaging with mutagenesis, multiple orthogonal approaches","pmids":["36066504"],"is_preprint":false},{"year":2022,"finding":"Under iron repletion, NCOA4 binds Fe3+ through its intrinsically disordered region, forming insoluble condensates that sequester NCOA4 away from ferritin and allow ferritin accumulation. Under prolonged iron repletion, NCOA4 condensates deliver ferritin to lysosomes via a TAX1BP1-dependent non-canonical autophagy pathway, preventing iron deficiency from excessive ferritin storage.","method":"Biochemical fractionation, ferritin-NCOA4 condensate imaging, iron chelation/repletion experiments, TAX1BP1 genetic depletion","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple methods (imaging, fractionation, genetic) in single lab with mechanistically distinct findings","pmids":["35318808"],"is_preprint":false},{"year":2022,"finding":"NCOA4 links iron bioavailability to DNA replication: it physically interacts with MCM7 and inhibits CMG helicase-mediated DNA replication origin activation. NCOA4-null MEFs show unscheduled origin activation, reduced inter-origin distance, fork stalling, reduced fork speed, and premature senescence. In iron-depleted cells, NCOA4 knockdown leads to unscheduled DNA synthesis, replication stress, and genome instability.","method":"Xenopus laevis egg extract depletion-reconstitution, Co-IP with MCM7, NCOA4-KO MEFs with replication stress readouts, DNA fiber assay, iron depletion experiments","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — reconstitution in Xenopus extracts plus KO MEF experiments with multiple orthogonal readouts","pmids":["24910095","35977492"],"is_preprint":false},{"year":2023,"finding":"The C-terminal FTH1-binding domain of NCOA4 harbors a [3Fe-4S] iron-sulfur cluster (approximately one per monomer). Under iron-repletion, holo-NCOA4 (with [3Fe-4S]) is recognized by HERC2 ubiquitin ligase for polyubiquitination and proteasomal degradation, favoring ferritin iron storage. Under iron-depletion, apo-NCOA4 (lacking the cluster) binds FTH1 to promote ferritinophagy and iron release.","method":"Fe-S cluster reconstitution in vitro, mass spectrometry, Co-IP with HERC2 and FTH1 for holo vs. apo-NCOA4, iron depletion/repletion assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro biochemical reconstitution with Fe-S cluster and differential interaction assays, single lab multiple methods","pmids":["38159858"],"is_preprint":false},{"year":2023,"finding":"Cellular oxygen tension regulates NCOA4 iron sensing: under normoxia, NCOA4 forms Fe3+-binding condensates and degrades ferritin; under hypoxia, the Fe-S cluster-mediated HERC2 recognition and proteasomal degradation of NCOA4 is enhanced, reducing ferritinophagy. Both pathways can co-occur in the same cell, with oxygen determining pathway selection.","method":"Iron chelation, hypoxia chamber experiments, Fe-S cluster analysis, HERC2 interaction under varying O2 tensions","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mechanistic experiments under defined conditions, single lab, two orthogonal readouts","pmids":["37059186"],"is_preprint":false},{"year":2023,"finding":"ATM kinase phosphorylates NCOA4, facilitating NCOA4–ferritin interaction and sustaining ferritinophagy for labile iron release. ATM inhibition or knockout reduces ferritinophagy and confers resistance to ferroptosis in a TRP53-independent manner.","method":"ATM pharmacological inhibition and genetic knockout, phosphorylation assays, NCOA4-ferritin Co-IP, ferroptosis assays in MEFs","journal":"Autophagy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — kinase-substrate relationship shown by Co-IP and genetic KO with ferroptosis readout, single lab","pmids":["36752571"],"is_preprint":false},{"year":2023,"finding":"TRIM21 promotes HERC2 proteasomal degradation downstream of Mtb-activated p38/AKT1 signaling, increasing NCOA4 levels and NCOA4-mediated ferritin degradation in macrophages. This enhances bioavailable iron for intracellular Mtb growth. NCOA4 deficiency in myeloid cells accelerates Mtb clearance in mice.","method":"Macrophage infection models, mass spectrometry, genetic depletion of NCOA4/TRIM21/HERC2, myeloid-specific Ncoa4 KO mice","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple epistasis experiments, myeloid KO mouse, mechanistic pathway resolved with multiple methods","pmids":["37066876"],"is_preprint":false},{"year":2023,"finding":"STING interacts directly with NCOA4 via specific residues (Q237, E316, S322 in the CBD domain of STING and the coiled-coil domain of NCOA4). This interaction triggers ferritinophagy-mediated ferroptosis, stabilizes STING dimers enhancing inflammatory signaling, and reduces nuclear localization of NCOA4, impairing its transcriptional coregulator function.","method":"Single-cell RNA-seq, mass spectrometry, Co-IP mapping interaction domains, STING/NCOA4 genetic manipulation, nuclear fractionation","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with domain mapping and genetic approaches, single lab","pmids":["35902564"],"is_preprint":false},{"year":2022,"finding":"TRIM7 E3 ubiquitin ligase directly binds NCOA4 and ubiquitinates it via K48-linked chains, promoting NCOA4 degradation and thereby reducing NCOA4-mediated ferritinophagy and ferroptosis in glioblastoma cells.","method":"Co-IP, ubiquitination assay with K48-linkage characterization, TRIM7 KD/OE with ferritinophagy and ferroptosis readouts","journal":"Redox biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and ubiquitination assay with genetic manipulation, single lab","pmids":["36067704"],"is_preprint":false},{"year":2024,"finding":"DTX2 E3 ubiquitin ligase binds NCOA4 and promotes its ubiquitination and degradation via K48-linked chains, suppressing NCOA4-mediated ferritinophagy and conferring ferroptosis resistance in NSCLC cells.","method":"Co-IP, ubiquitination assay with K48 chain characterization, DTX2 KD/OE with NCOA4 and ferritinophagy readouts","journal":"Drug resistance updates","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and ubiquitination assay, single lab","pmids":["39366066"],"is_preprint":false},{"year":2024,"finding":"USP2 deubiquitylase stabilizes NCOA4 by removing K48-linked ubiquitin chains; USP2 binds NCOA4 and prevents its degradation, triggering ferritinophagy and ferroptosis in esophageal squamous cell carcinoma. Hypoxia downregulates USP2, thereby decreasing NCOA4 stability and reducing ferritinophagy-mediated ferroptosis.","method":"Co-IP, ubiquitin chain type analysis, USP2 KO/OE in vitro and in vivo xenograft, NCOA4 stability assay","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and genetic KO with in vivo validation, single lab","pmids":["38744953"],"is_preprint":false},{"year":2024,"finding":"FOXO1 transcription factor directly suppresses NCOA4 expression; knockdown of FOXO1 amplifies NCOA4-mediated ferritinophagy and ferroptosis in cochlear spiral ganglion neurons. Disrupting FOXO1–NCOA4 interaction in NCOA4 knockout mice prevents cisplatin-induced ferroptosis.","method":"FOXO1 KD and genetic interaction with NCOA4 KO, cisplatin model, luciferase reporter assay implied by 'directly suppress', hearing loss readouts","journal":"Advanced science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic interaction experiments with KO mice, single lab with multiple readouts","pmids":["39206719"],"is_preprint":false},{"year":2024,"finding":"JWA (ARL6IP5) interacts with NCOA4 at its ferritin binding site, competing with FTH1 binding and thereby inhibiting NCOA4-mediated ferritinophagy and ferroptosis in dopaminergic neurons. Molecular docking, co-immunoprecipitation, and immunofluorescence confirm direct interaction.","method":"Molecular docking, Co-IP, immunofluorescence, JWA genetic manipulation in cellular and mouse PD models","journal":"Redox biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and molecular docking with genetic manipulation, single lab","pmids":["38744191"],"is_preprint":false},{"year":2024,"finding":"Lipocalin-2 (LCN2) interacts with NCOA4 under high-phosphate conditions, potentially accelerating FTH1 degradation via ferritinophagy-dependent ferroptosis in vascular smooth muscle cells, contributing to vascular calcification in CKD.","method":"LCN2 KO mice, Co-IP between LCN2 and NCOA4, LCN2 OE in vascular smooth muscle cells with ferritinophagy and ferroptosis readouts","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and KO mouse with defined vascular calcification phenotype, single lab","pmids":["39613734"],"is_preprint":false},{"year":2024,"finding":"Cryptochrome 1 (CRY1) regulates NCOA4 protein stability by promoting HERC2-mediated ubiquitination and degradation of NCOA4; CRY1 knockdown increases NCOA4-mediated ferritinophagy and causes granulosa cell senescence. KL201 (CRY1 stabilizer) reduces ferritinophagy and improves ovarian function in aged mice.","method":"Co-IP, ubiquitination assay, NCOA4 siRNA rescue, CRY1 KD/OE, CRY1-stabilizer in vivo","journal":"Free radical biology & medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and ubiquitination assay with genetic rescue, single lab","pmids":["38522484"],"is_preprint":false},{"year":2023,"finding":"JNK-JUN signaling directly upregulates NCOA4 transcription; JUN binds the Ncoa4 promoter and initiates its transcription. Elevated NCOA4 then increases autophagic ferritin degradation and iron levels, causing chondrocyte ferroptosis and osteoarthritis progression.","method":"Promoter ChIP of JUN at Ncoa4, JNK/JUN inhibitor experiments, NCOA4 OE/KD in chondrocytes and mouse intra-articular AAV9 delivery","journal":"Free radical biology & medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP and promoter analysis plus in vivo gene delivery, single lab","pmids":["36907253"],"is_preprint":false},{"year":2023,"finding":"IL-6/STAT3 signaling upregulates NCOA4 protein levels; STAT3 inhibition or knockdown reduces NCOA4 and protects cardiomyocytes from ferritinophagy-mediated ferroptosis; STAT3 overexpression increases NCOA4 expression and ferroptotic events.","method":"STAT3 KD/OE, NCOA4 siRNA, high-fat diet mouse model with cardiac injury readouts","journal":"Free radical biology & medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic manipulation with pathway epistasis, single lab","pmids":["36940731"],"is_preprint":false},{"year":2023,"finding":"PTBP1 RNA-binding protein promotes NCOA4 translation by directly binding to the 5'-UTR of NCOA4 mRNA (shown by pull-down assay and dual-luciferase assay); PTBP1 silencing does not affect NCOA4 mRNA stability but reduces NCOA4 protein and consequently ferritinophagy-mediated ferroptosis in liver cancer cells.","method":"RNA pull-down, dual-luciferase reporter assay, cycloheximide chase (stability negative), PTBP1 siRNA with ferroptosis readouts","journal":"Oncology reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RNA pull-down and reporter assay with negative stability control, single lab","pmids":["36660932"],"is_preprint":false},{"year":2022,"finding":"NCOA4-mediated ferritinophagy is upregulated in pancreatic ductal adenocarcinoma to sustain iron availability; quantitative proteomics shows that ferritinophagy fuels iron-sulfur cluster protein synthesis to support mitochondrial homeostasis and PDAC tumor progression. NCOA4 targeting leads to tumor growth delay.","method":"Patient-derived and murine PDAC models, quantitative proteomics, NCOA4 genetic targeting, iron-sulfur cluster protein analysis","journal":"Cancer discovery","confidence":"High","confidence_rationale":"Tier 2 / Strong — patient-derived models plus murine models with quantitative proteomics and genetic targeting, multiple readouts","pmids":["35771492"],"is_preprint":false},{"year":2017,"finding":"Thyroid hormone receptor beta (TRβ) cooperates with NCOA4 during terminal human erythroid differentiation; genome-wide analysis shows TH promotes NCOA4 recruitment to chromatin regions near Pol II associated with terminal differentiation transcripts. Ncoa4-/- mice are anemic perinatally and fail to respond to TH with enhanced erythropoiesis, placing NCOA4 as a critical coactivator downstream of TH/TRβ in erythropoiesis.","method":"RNA-seq in reticulocytes, ChIP-seq for NCOA4 chromatin recruitment, Ncoa4-KO mouse with TH/TRβ agonist challenge, TH depletion culture assay","journal":"Proceedings of the National Academy of Sciences","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP-seq, KO mouse, and functional erythropoiesis assays with TH/TRβ axis defined","pmids":["28864529"],"is_preprint":false},{"year":2021,"finding":"Compound 9a directly binds to recombinant NCOA4(383-522) and blocks the NCOA4–FTH1 protein-protein interaction, reducing bioavailable intracellular ferrous iron and inhibiting ferroptosis, establishing this domain as a druggable interface.","method":"Binding assay with recombinant NCOA4(383-522), NCOA4-FTH1 interaction inhibition assay, cellular ferroptosis assay, in vivo ischemic stroke rat model","journal":"ACS central science","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — in vitro binding and interaction inhibition with recombinant protein plus in vivo model, single lab","pmids":["34235259"],"is_preprint":false},{"year":1996,"finding":"ARA70 (NCOA4) was identified as a ligand-dependent coactivator of the androgen receptor (AR) via yeast two-hybrid; it enhances AR transcriptional activity ~10-fold in the presence of androgen but only marginally activates other steroid receptors (ER, GR, PR) in DU145 prostate cancer cells.","method":"Yeast two-hybrid, transient transfection reporter assay in DU145 cells","journal":"Proceedings of the National Academy of Sciences","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — yeast two-hybrid plus reporter assay, foundational identification paper replicated by multiple labs","pmids":["8643607"],"is_preprint":false},{"year":1999,"finding":"ARA70/ELE1alpha interacts in vitro with AR, GR, and ER in a ligand-independent manner via the ligand-binding domain of the receptors and a region corresponding to predicted helix 3 of AR (mutation of L712R greatly reduces AR affinity). ARA70 lacks intrinsic transcription activation domain or histone acetyltransferase activity but interacts with p/CAF histone acetyltransferase and basal transcription factor TFIIB, suggesting a bridging function.","method":"In vitro GST pulldown and Co-IP, site-directed mutagenesis of AR L712R, HAT activity assay, reporter assay in DU145/HeLa/COS cells","journal":"Molecular endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro pulldown, mutagenesis, and functional assays; single lab with multiple methods","pmids":["9892017"],"is_preprint":false},{"year":1999,"finding":"ARA70 functions as a ligand-enhanced coactivator for PPARgamma: ARA70 and PPARgamma physically interact by co-immunoprecipitation and mammalian two-hybrid, and cotransfection of AR can squelch PPARgamma-ARA70 transactivation, indicating cross-talk between PPARgamma- and AR-mediated signaling.","method":"Co-immunoprecipitation, mammalian two-hybrid, transient transfection reporter assay in DU145 cells, ligand enhancement test","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and functional reporter assay with ligand dose-response, single lab","pmids":["10347167"],"is_preprint":false},{"year":2004,"finding":"ARA70 promotes AR activity via a FXXLF motif within the ARA70-N2 domain (aa 176-401), not via the LXXLL motif (aa 92-96); the LXXLL motif is required for interaction with other receptors (e.g. PPARgamma). ARA70 enhances AR transactivation by increasing AR protein expression, stability, and nuclear translocation.","method":"Domain deletion/mutation analysis, reporter assays, AR expression and stability measurements, nuclear translocation assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — motif mutagenesis with multiple mechanistic readouts, single lab","pmids":["15166229"],"is_preprint":false},{"year":2003,"finding":"Antiandrogens (hydroxyflutamide, bicalutamide, cyproterone acetate, RU58841), genistein, and RU486 promote interaction between AR and ARA70 in a dose-dependent manner in mammalian two-hybrid assay, and cotransfection of AR with ARA70 significantly enhances AR transcriptional activity in DU145 cells, providing a molecular mechanism for antiandrogen agonist activity.","method":"Mammalian two-hybrid assay, chloramphenicol acetyltransferase reporter assay, dose-response experiments in DU145 cells","journal":"Proceedings of the National Academy of Sciences","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — cell-based interaction and reporter assays, replicated by follow-up work","pmids":["9636157"],"is_preprint":false},{"year":2001,"finding":"The RFG (NCOA4) coiled-coil domain mediates oligomerization of RET/PTC3, activates its kinase and transforming activity, mediates physical association of RET/PTC3 with endogenous RFG protein (making RFG a substrate for RET/PTC3 kinase), and re-localizes RET/PTC3 to the membrane/particulate cell compartment.","method":"Co-IP, kinase autophosphorylation assay, focus-formation transformation assay, subcellular fractionation, coiled-coil domain deletion mutants","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and kinase assay with domain deletion mutants, single lab","pmids":["11313992"],"is_preprint":false},{"year":2025,"finding":"Reduced mechanical tension decreases intracellular free iron by enhancing FTH1 expression and diminishing NCOA4, which mediates FTH1 phase separation-induced ferritinophagy. Targeting NCOA4 rescues ferroptosis susceptibility under low mechanical tension through modulation of FTH1 phase separation-driven autophagy.","method":"Mechanical tension manipulation, NCOA4 genetic targeting, FTH1 phase separation assay, ferroptosis readouts","journal":"Autophagy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic manipulation with mechanically defined conditions and phase separation readout, single lab","pmids":["39988734"],"is_preprint":false},{"year":2024,"finding":"Activated macrophages and monocytes secrete NCOA4 via autophagy-dependent lysosomal exocytosis (mediated by ATG5 and MCOLN1), and extracellular NCOA4 acts as a danger-associated molecular pattern that activates NF-κB by promoting NFKBIA degradation in a pattern-recognition receptor AGER-dependent (not TLR4-dependent) manner.","method":"ATG5/MCOLN1 genetic depletion, lysosomal exocytosis assay, AGER KO macrophages, endotoxemia/CLP mouse model, anti-NCOA4 neutralizing antibody","journal":"Autophagy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple genetic knockouts and in vivo models, single lab","pmids":["38916095"],"is_preprint":false}],"current_model":"NCOA4 is a multifunctional protein best characterized as the selective autophagy cargo receptor (ferritinophagy) that binds ferritin heavy chain (FTH1) via its C-terminal domain—which harbors a [3Fe-4S] cluster acting as an iron sensor—to deliver ferritin to lysosomes for iron release; NCOA4 protein abundance is regulated by iron-dependent HERC2-mediated ubiquitination/proteasomal degradation (favored when the [3Fe-4S] cluster is loaded or NCOA4 forms iron-induced condensates), ATM-mediated phosphorylation, and multiple E3 ligases (TRIM7, DTX2) and deubiquitylases (USP2), while transcriptional control by JNK-JUN and STAT3 modulates its expression; NCOA4-mediated ferritinophagy is critical for systemic and erythroid iron homeostasis, supports heme synthesis and hemoglobin formation in developing red cells through a PCBP1-ferritin-NCOA4 axis, and drives ferroptosis sensitivity by controlling labile iron pools; additionally, NCOA4 inhibits DNA replication origin activation by interacting with MCM7/CMG helicase, linking iron bioavailability to DNA replication control, and—in its original nuclear receptor context—functions as a ligand-dependent coactivator of AR, PPARγ, TRβ, and ERα via distinct interaction motifs."},"narrative":{"mechanistic_narrative":"NCOA4 is the selective autophagy cargo receptor for ferritin (ferritinophagy), coupling intracellular iron status to lysosomal ferritin turnover and thereby governing the cellular labile iron pool [PMID:24695223]. It binds ferritin heavy chain (FTH1) directly through a C-terminal element that recognizes a key surface arginine on FTH1, while associating with ATG8 proteins to deliver ferritin to lysosomes; this interaction is required for ferritin degradation and iron release [PMID:24695223, PMID:26436293, PMID:28754384]. NCOA4 homodimerizes and engages FTH1 multivalently to drive phase separation of ferritin into liquid-like condensates that are engulfed by autophagosomes and endosomes via TAX1BP1 [PMID:36066504, PMID:35318808]. Iron sensing is intrinsic to the protein: its C-terminal FTH1-binding domain carries a [3Fe-4S] cluster, and holo-NCOA4 is recognized by the HERC2 ubiquitin ligase for proteasomal degradation under iron repletion, whereas apo-NCOA4 binds FTH1 to promote ferritinophagy under iron depletion [PMID:38159858]. NCOA4 abundance and activity are further tuned by ATM-mediated phosphorylation [PMID:36752571], additional E3 ligases and a deubiquitylase (TRIM7, DTX2, USP2) [PMID:36067704, PMID:39366066, PMID:38744953], and transcriptional/translational inputs [PMID:36907253, PMID:36940731, PMID:36660932]. Through this iron-release function, NCOA4 is essential for systemic, macrophage, and erythroid iron homeostasis and supports heme and hemoglobin synthesis via a PCBP1-ferritin-NCOA4 vectorial iron-transfer axis [PMID:26776506, PMID:28375153, PMID:30630985, PMID:32107334], and it is a principal determinant of ferroptosis sensitivity by controlling labile iron [PMID:36752571, PMID:36067704, PMID:34235259]. Independently of iron release, NCOA4 interacts with MCM7 and restrains CMG helicase-mediated DNA replication origin activation, linking iron bioavailability to genome stability [PMID:24910095, PMID:35977492]. In its original nuclear-receptor context, NCOA4 (ARA70) acts as a ligand-dependent coactivator of the androgen receptor through an FXXLF motif and of PPARgamma through an LXXLL motif, bridging receptors to the basal transcription machinery, and cooperates with TRbeta during erythroid differentiation [PMID:28864529, PMID:8643607, PMID:15166229].","teleology":[{"year":2014,"claim":"Established NCOA4's defining function by identifying it as the selective cargo receptor that targets ferritin to lysosomes, answering how cells mobilize stored iron through autophagy.","evidence":"Quantitative autophagosome proteomics with reciprocal Co-IP of NCOA4 and ferritin subunits and knockdown/knockout ferritin-degradation readouts","pmids":["24695223"],"confidence":"High","gaps":["Did not define the molecular interaction interface","Did not explain how iron status switches the receptor on or off"]},{"year":2015,"claim":"Defined the NCOA4-FTH1 binding interface and revealed iron-dependent HERC2 ubiquitination as the off-switch, showing how ferritinophagy is suppressed under iron excess.","evidence":"Mutagenesis of the FTH1/NCOA4 interface, Co-IP, depletion-reconstitution, ubiquitination assays, and zebrafish genetics","pmids":["26436293"],"confidence":"High","gaps":["Molecular nature of the iron signal sensed by NCOA4 not yet identified","Structural basis of HERC2 recognition unresolved"]},{"year":2016,"claim":"Demonstrated NCOA4 is essential for systemic iron homeostasis in vivo and mapped the ferritin-targeting activity to the C-terminal domain (aa 239-614).","evidence":"Knockout mouse with dietary iron manipulation plus domain reconstitution in null MEFs","pmids":["26776506"],"confidence":"High","gaps":["Cell-type-specific contributions not dissected","Did not resolve erythroid versus systemic mechanisms"]},{"year":2017,"claim":"Showed ferritinophagy feeds iron into heme synthesis during erythropoiesis and works in series with PCBP1 to achieve vectorial iron transfer through ferritin.","evidence":"siRNA depletion in an erythroid differentiation model and Pcbp1-KO mouse ex vivo erythroid differentiation with heme/hemoglobin assays","pmids":["28375153"],"confidence":"High","gaps":["Stoichiometry and kinetics of PCBP1-NCOA4 coordination not quantified","Mechanism of iron delivery to mitochondria unresolved"]},{"year":2017,"claim":"Placed NCOA4 in the nuclear-receptor pathway during erythropoiesis as a TH/TRbeta coactivator recruited to chromatin near terminal differentiation genes.","evidence":"RNA-seq, NCOA4 ChIP-seq, and Ncoa4-KO mouse with TH/TRbeta agonist challenge","pmids":["28864529"],"confidence":"High","gaps":["Relationship between nuclear coactivator and cytoplasmic ferritinophagy roles not integrated","Direct DNA/chromatin targets incompletely mapped"]},{"year":2020,"claim":"Quantified the NCOA4-ferritin interaction thermodynamically and showed NCOA4 binding itself blocks chemical iron mobilization from the ferritin shell.","evidence":"Isothermal titration calorimetry and in vitro iron oxidation/mobilization kinetics with recombinant NCOA4(383-522)","pmids":["32608971","28754384"],"confidence":"High","gaps":["In vitro reconstitution may not capture cellular condensate context","Physiological consequence of mobilization inhibition unclear"]},{"year":2022,"claim":"Reframed ferritinophagy as condensate-driven, showing NCOA4 homodimerization and multivalent FTH1 binding nucleate ferritin condensates captured by autophagosomes and endosomes via TAX1BP1.","evidence":"Live-cell imaging, 3D correlative light-electron microscopy, and dimerization/FTH1-interaction mutants","pmids":["36066504","35318808"],"confidence":"High","gaps":["How iron status toggles condensate composition not fully resolved","Selection between macro- and micro-ferritinophagy routes incompletely defined"]},{"year":2022,"claim":"Uncovered an iron-independent function: NCOA4 binds MCM7 and restrains replication origin firing, linking iron bioavailability to controlled DNA replication and genome stability.","evidence":"Xenopus egg-extract depletion-reconstitution, Co-IP with MCM7, and NCOA4-KO MEFs with DNA fiber and replication-stress readouts","pmids":["24910095","35977492"],"confidence":"High","gaps":["Structural basis of MCM7/CMG inhibition unknown","How this nuclear role coordinates with cytoplasmic ferritinophagy unresolved"]},{"year":2022,"claim":"Showed NCOA4-driven ferritinophagy sustains iron-sulfur cluster protein synthesis and mitochondrial homeostasis to fuel pancreatic cancer progression, identifying it as a tumor dependency.","evidence":"Patient-derived and murine PDAC models with quantitative proteomics and genetic NCOA4 targeting","pmids":["35771492"],"confidence":"High","gaps":["Generality across tumor types not established here","Mechanism coupling ferritinophagy to Fe-S cluster supply not detailed"]},{"year":2023,"claim":"Identified the molecular iron sensor: a [3Fe-4S] cluster in the C-terminal domain determines whether NCOA4 is degraded by HERC2 (holo) or binds FTH1 to promote ferritinophagy (apo).","evidence":"In vitro Fe-S cluster reconstitution, mass spectrometry, and differential Co-IP of holo versus apo-NCOA4 with HERC2/FTH1","pmids":["38159858"],"confidence":"High","gaps":["In vivo confirmation of the cluster's regulatory role lacking","Cluster assembly/disassembly machinery not identified"]},{"year":2023,"claim":"Layered additional regulation onto NCOA4 stability and activity through ATM phosphorylation, oxygen tension, and pathogen-driven TRIM21/HERC2 signaling, tuning ferritinophagy and ferroptosis.","evidence":"ATM inhibition/KO with phospho and ferroptosis assays; hypoxia chamber and Fe-S/HERC2 analyses; macrophage Mtb infection with myeloid-specific Ncoa4 KO mice","pmids":["36752571","37059186","37066876"],"confidence":"Medium","gaps":["ATM phosphosites on NCOA4 not mapped","Oxygen and infection inputs studied in single labs"]},{"year":2024,"claim":"Resolved a regulatory network of E3 ligases, a deubiquitylase, transcription factors, an RNA-binding protein, and competitive binders that set NCOA4 levels and thereby ferroptosis sensitivity across disease contexts.","evidence":"Co-IP and K48-ubiquitination assays (TRIM7, DTX2, USP2); promoter/ChIP and reporter analyses (JNK-JUN, STAT3, FOXO1, PTBP1); competitive-binding Co-IP (JWA/ARL6IP5, LCN2, CRY1) with cellular and mouse models","pmids":["36067704","39366066","38744953","36907253","36940731","39206719","36660932","38744191","39613734","38522484"],"confidence":"Medium","gaps":["Most regulators validated in single labs and disease-specific contexts","Hierarchy and interplay among these regulators not integrated"]},{"year":2024,"claim":"Revealed a non-receptor extracellular role: secreted NCOA4 acts as a danger-associated molecular pattern activating NF-kB via AGER, expanding its function beyond intracellular iron handling.","evidence":"ATG5/MCOLN1 depletion, lysosomal exocytosis assays, AGER-KO macrophages, and endotoxemia/CLP mouse models with neutralizing antibody","pmids":["38916095"],"confidence":"Medium","gaps":["Single-lab finding awaiting independent confirmation","Relationship of secreted NCOA4 to its iron-handling pool unclear"]},{"year":null,"claim":"How NCOA4's distinct activities—ferritinophagy, MCM7-dependent replication control, and nuclear-receptor coactivation—are coordinated within a single cell, and how the [3Fe-4S] iron sensor is loaded and unloaded in vivo, remain unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model linking cytoplasmic, nuclear, and secreted functions","No structural model of NCOA4 in any of its complexes","In vivo Fe-S cluster cycling machinery unidentified"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0038024","term_label":"cargo receptor activity","supporting_discovery_ids":[0,1,8]},{"term_id":"GO:0140299","term_label":"molecular sensor activity","supporting_discovery_ids":[11,12]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[27,29,31,32]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,30]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[0,9]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[27,29,32]},{"term_id":"GO:0005764","term_label":"lysosome","supporting_discovery_ids":[0,1]}],"pathway":[{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[0,1,8]},{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[2,3,26]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[13,16,28]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[27,29]},{"term_id":"R-HSA-69306","term_label":"DNA Replication","supporting_discovery_ids":[10]}],"complexes":[],"partners":["FTH1","HERC2","MCM7","TAX1BP1","AR","PPARG","TRIM7","USP2"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q13772","full_name":"Nuclear receptor coactivator 4","aliases":["Androgen receptor coactivator 70 kDa protein","70 kDa AR-activator","70 kDa androgen receptor coactivator","Androgen receptor-associated protein of 70 kDa","Ferritin cargo receptor NCOA4","Ret-activating protein ELE1"],"length_aa":614,"mass_kda":69.7,"function":"Cargo receptor for the autophagic turnover of the iron-binding ferritin complex, playing a central role in iron homeostasis (PubMed:25327288, PubMed:26436293). Acts as an adapter for delivery of ferritin to lysosomes and autophagic degradation of ferritin, a process named ferritinophagy (PubMed:25327288, PubMed:26436293). Targets the iron-binding ferritin complex to autolysosomes following starvation or iron depletion (PubMed:25327288). Ensures efficient erythropoiesis, possibly by regulating hemin-induced erythroid differentiation (PubMed:26436293). In some studies, has been shown to enhance the androgen receptor AR transcriptional activity as well as acting as ligand-independent coactivator of the peroxisome proliferator-activated receptor (PPAR) gamma (PubMed:10347167, PubMed:8643607). Another study shows only weak behavior as a coactivator for the androgen receptor and no alteration of the ligand responsiveness of the AR (PubMed:10517667). Binds to DNA replication origins, binding is not restricted to sites of active transcription and may likely be independent from the nuclear receptor transcriptional coactivator function (PubMed:24910095). May inhibit activation of DNA replication origins, possibly by obstructing DNA unwinding via interaction with the MCM2-7 complex (PubMed:24910095)","subcellular_location":"Cytoplasmic vesicle, autophagosome; Autolysosome; Nucleus; Chromosome","url":"https://www.uniprot.org/uniprotkb/Q13772/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/NCOA4","classification":"Common Essential","n_dependent_lines":444,"n_total_lines":1208,"dependency_fraction":0.3675496688741722},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"FTH1","stoichiometry":10.0}],"url":"https://opencell.sf.czbiohub.org/search/NCOA4","total_profiled":1310},"omim":[{"mim_id":"620395","title":"CYCLIN J; CCNJ","url":"https://www.omim.org/entry/620395"},{"mim_id":"611928","title":"PROSTATE CANCER, HEREDITARY, 13; HPC13","url":"https://www.omim.org/entry/611928"},{"mim_id":"601984","title":"NUCLEAR RECEPTOR COACTIVATOR 4; NCOA4","url":"https://www.omim.org/entry/601984"},{"mim_id":"313700","title":"ANDROGEN RECEPTOR; AR","url":"https://www.omim.org/entry/313700"},{"mim_id":"188550","title":"THYROID CANCER, NONMEDULLARY, 1; NMTC1","url":"https://www.omim.org/entry/188550"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoli","reliability":"Approved"},{"location":"Golgi apparatus","reliability":"Additional"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/NCOA4"},"hgnc":{"alias_symbol":["ARA70","RFG","ELE1","PTC3","DKFZp762E1112"],"prev_symbol":[]},"alphafold":{"accession":"Q13772","domains":[{"cath_id":"1.20.120","chopping":"16-151","consensus_level":"medium","plddt":92.084,"start":16,"end":151}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q13772","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q13772-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q13772-F1-predicted_aligned_error_v6.png","plddt_mean":55.97},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=NCOA4","jax_strain_url":"https://www.jax.org/strain/search?query=NCOA4"},"sequence":{"accession":"Q13772","fasta_url":"https://rest.uniprot.org/uniprotkb/Q13772.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q13772/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q13772"}},"corpus_meta":[{"pmid":"24695223","id":"PMC_24695223","title":"Quantitative 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NCOA4-deficient cells cannot degrade ferritin, leading to decreased bioavailable intracellular iron.\",\n      \"method\": \"Quantitative autophagosome proteomics, co-immunoprecipitation of NCOA4 with ferritin subunits, NCOA4 knockdown/knockout with ferritin degradation and iron bioavailability readouts\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP and KO with defined cellular phenotype; widely replicated across many subsequent labs\",\n      \"pmids\": [\"24695223\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Direct physical interaction between NCOA4 and FTH1 requires a key surface arginine in FTH1 and a C-terminal element in NCOA4, and is necessary for ferritin delivery to lysosomes via autophagosomes. NCOA4 protein abundance is dually controlled by autophagy and the ubiquitin-proteasome system; under excess iron, HERC2 ubiquitin ligase binds NCOA4 in an iron-dependent manner and promotes its proteasomal degradation, thereby suppressing ferritinophagy.\",\n      \"method\": \"Mutagenesis of FTH1 and NCOA4 interaction interface, Co-IP, depletion-reconstitution, ubiquitination assays, zebrafish genetic model\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — multiple orthogonal methods (mutagenesis, Co-IP, in vivo zebrafish), replicated by subsequent papers\",\n      \"pmids\": [\"26436293\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"NCOA4 knockout mice show iron accumulation in liver and spleen, elevated transferrin saturation and serum ferritin, and mild microcytic hypochromic anemia; under iron-deprivation or iron-enriched diets, phenotypes are dramatically exacerbated, establishing NCOA4 as essential for systemic iron homeostasis in vivo. Expression of the NCOA4 C-terminal domain (aa 239–614) restores impaired autophagic ferritin targeting in null MEFs.\",\n      \"method\": \"Knockout mouse model, dietary iron manipulation, primary MEF ferritin degradation assay, domain reconstitution\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo KO with defined phenotypic readouts and domain reconstitution; replicated by other KO studies\",\n      \"pmids\": [\"26776506\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"In developing erythroid cells, NCOA4-mediated ferritinophagy is required for iron flux through ferritin to mitochondria for heme synthesis; NCOA4 depletion impairs iron trafficking through ferritin, reducing heme synthesis and hemoglobin formation. PCBP1 loads iron into ferritin while NCOA4 mediates autophagic release, coordinating vectorial iron transfer.\",\n      \"method\": \"siRNA depletion of NCOA4 and PCBP1 in cultured erythroid differentiation model, Pcbp1-KO mouse ex vivo erythroid differentiation, heme/hemoglobin assays\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO in mice plus in vitro depletion with functional iron/heme readouts; independently consistent with other erythropoiesis papers\",\n      \"pmids\": [\"28375153\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"The ferritin-binding domain of NCOA4 (residues 383–522) forms a soluble dimer with low secondary structure, binds H-ferritin (FTH1) with nM affinity but not the R23A FTH1 mutant or L-ferritin, and Fe(II) partially inhibits this binding. Each ferritin shell can bind up to 24 NCOA4 fragments, forming highly stable and insoluble complexes.\",\n      \"method\": \"Recombinant expression of NCOA4(383-522) in E. coli, electrophoretic mobility shift assay, ELISA binding assay, CD spectroscopy, metal-ion competition\",\n      \"journal\": \"Biochimica et biophysica acta. General subjects\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro biochemical reconstitution with mutagenesis and multiple assays in single lab\",\n      \"pmids\": [\"28754384\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Ncoa4 has both cell-autonomous (erythroid) and non-cell-autonomous (macrophage/systemic) roles in erythropoiesis. Acute systemic Ncoa4 KO causes tissue ferritin/iron accumulation and anemia; erythroid-specific KO produces postnatal anemia and hypochromic microcytic anemia; macrophage ferritinophagy is a major route for iron release supporting erythropoiesis, especially under iron deficiency.\",\n      \"method\": \"Inducible systemic KO mouse model, erythroid-specific conditional KO, bone marrow transplantation, hematological and iron parameter readouts\",\n      \"journal\": \"Haematologica\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple conditional KO models with cell-type-specific phenotypic dissection\",\n      \"pmids\": [\"30630985\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Using isothermal titration calorimetry, NCOA4(383-522) binds H-rich ferritins with Kd ~0.4 µM (homopolymer) and ~2 µM (heteropolymer), with ~8 NCOA4 molecules per ferritin shell; binding is enthalpically and entropically favored. NCOA4 binding inhibits iron mobilization from ferritin by reducing agents (FMN/NADH, sodium dithionite) in a concentration-dependent manner, suggesting interference with electron transfer through the ferritin shell.\",\n      \"method\": \"Isothermal titration calorimetry, iron oxidation/mobilization kinetic assays in vitro with recombinant proteins\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with thermodynamic and kinetic measurements, single lab with multiple methods\",\n      \"pmids\": [\"32608971\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Macrophage-specific NCOA4-mediated ferritinophagy is a major route for iron release to support systemic erythropoiesis; Ncoa4-KO bone marrow transplants into wild-type recipients reveal iron retention in spleen macrophages and failure to mobilize iron stores in response to erythropoietin.\",\n      \"method\": \"Reciprocal bone marrow transplantation in Ncoa4-KO mice, iron deficiency diet, erythropoietin challenge, hematological readouts\",\n      \"journal\": \"Haematologica\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal transplantation experiment with cell-type-specific iron mobilization readouts\",\n      \"pmids\": [\"32107334\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"NCOA4 drives phase separation/liquid-like condensate formation of ferritin particles via homodimerization of NCOA4 and multivalent FTH1–NCOA4 interactions; these condensates are directly engulfed by autophagosomes and endosomes (macroferritinophagy and microferritinophagy). Disruption of NCOA4 homodimerization or FTH1-binding interface impairs both condensate formation and ferritin degradation. TAX1BP1 is required for condensate incorporation into autophagosomes/endosomes but not for condensate formation.\",\n      \"method\": \"Live-cell imaging, 3D correlative light-electron microscopy, NCOA4 dimerization and FTH1-interaction mutants, autophagy/endosome incorporation assays\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — reconstitution and structural imaging with mutagenesis, multiple orthogonal approaches\",\n      \"pmids\": [\"36066504\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Under iron repletion, NCOA4 binds Fe3+ through its intrinsically disordered region, forming insoluble condensates that sequester NCOA4 away from ferritin and allow ferritin accumulation. Under prolonged iron repletion, NCOA4 condensates deliver ferritin to lysosomes via a TAX1BP1-dependent non-canonical autophagy pathway, preventing iron deficiency from excessive ferritin storage.\",\n      \"method\": \"Biochemical fractionation, ferritin-NCOA4 condensate imaging, iron chelation/repletion experiments, TAX1BP1 genetic depletion\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple methods (imaging, fractionation, genetic) in single lab with mechanistically distinct findings\",\n      \"pmids\": [\"35318808\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"NCOA4 links iron bioavailability to DNA replication: it physically interacts with MCM7 and inhibits CMG helicase-mediated DNA replication origin activation. NCOA4-null MEFs show unscheduled origin activation, reduced inter-origin distance, fork stalling, reduced fork speed, and premature senescence. In iron-depleted cells, NCOA4 knockdown leads to unscheduled DNA synthesis, replication stress, and genome instability.\",\n      \"method\": \"Xenopus laevis egg extract depletion-reconstitution, Co-IP with MCM7, NCOA4-KO MEFs with replication stress readouts, DNA fiber assay, iron depletion experiments\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — reconstitution in Xenopus extracts plus KO MEF experiments with multiple orthogonal readouts\",\n      \"pmids\": [\"24910095\", \"35977492\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"The C-terminal FTH1-binding domain of NCOA4 harbors a [3Fe-4S] iron-sulfur cluster (approximately one per monomer). Under iron-repletion, holo-NCOA4 (with [3Fe-4S]) is recognized by HERC2 ubiquitin ligase for polyubiquitination and proteasomal degradation, favoring ferritin iron storage. Under iron-depletion, apo-NCOA4 (lacking the cluster) binds FTH1 to promote ferritinophagy and iron release.\",\n      \"method\": \"Fe-S cluster reconstitution in vitro, mass spectrometry, Co-IP with HERC2 and FTH1 for holo vs. apo-NCOA4, iron depletion/repletion assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro biochemical reconstitution with Fe-S cluster and differential interaction assays, single lab multiple methods\",\n      \"pmids\": [\"38159858\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Cellular oxygen tension regulates NCOA4 iron sensing: under normoxia, NCOA4 forms Fe3+-binding condensates and degrades ferritin; under hypoxia, the Fe-S cluster-mediated HERC2 recognition and proteasomal degradation of NCOA4 is enhanced, reducing ferritinophagy. Both pathways can co-occur in the same cell, with oxygen determining pathway selection.\",\n      \"method\": \"Iron chelation, hypoxia chamber experiments, Fe-S cluster analysis, HERC2 interaction under varying O2 tensions\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mechanistic experiments under defined conditions, single lab, two orthogonal readouts\",\n      \"pmids\": [\"37059186\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"ATM kinase phosphorylates NCOA4, facilitating NCOA4–ferritin interaction and sustaining ferritinophagy for labile iron release. ATM inhibition or knockout reduces ferritinophagy and confers resistance to ferroptosis in a TRP53-independent manner.\",\n      \"method\": \"ATM pharmacological inhibition and genetic knockout, phosphorylation assays, NCOA4-ferritin Co-IP, ferroptosis assays in MEFs\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — kinase-substrate relationship shown by Co-IP and genetic KO with ferroptosis readout, single lab\",\n      \"pmids\": [\"36752571\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"TRIM21 promotes HERC2 proteasomal degradation downstream of Mtb-activated p38/AKT1 signaling, increasing NCOA4 levels and NCOA4-mediated ferritin degradation in macrophages. This enhances bioavailable iron for intracellular Mtb growth. NCOA4 deficiency in myeloid cells accelerates Mtb clearance in mice.\",\n      \"method\": \"Macrophage infection models, mass spectrometry, genetic depletion of NCOA4/TRIM21/HERC2, myeloid-specific Ncoa4 KO mice\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple epistasis experiments, myeloid KO mouse, mechanistic pathway resolved with multiple methods\",\n      \"pmids\": [\"37066876\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"STING interacts directly with NCOA4 via specific residues (Q237, E316, S322 in the CBD domain of STING and the coiled-coil domain of NCOA4). This interaction triggers ferritinophagy-mediated ferroptosis, stabilizes STING dimers enhancing inflammatory signaling, and reduces nuclear localization of NCOA4, impairing its transcriptional coregulator function.\",\n      \"method\": \"Single-cell RNA-seq, mass spectrometry, Co-IP mapping interaction domains, STING/NCOA4 genetic manipulation, nuclear fractionation\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with domain mapping and genetic approaches, single lab\",\n      \"pmids\": [\"35902564\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"TRIM7 E3 ubiquitin ligase directly binds NCOA4 and ubiquitinates it via K48-linked chains, promoting NCOA4 degradation and thereby reducing NCOA4-mediated ferritinophagy and ferroptosis in glioblastoma cells.\",\n      \"method\": \"Co-IP, ubiquitination assay with K48-linkage characterization, TRIM7 KD/OE with ferritinophagy and ferroptosis readouts\",\n      \"journal\": \"Redox biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and ubiquitination assay with genetic manipulation, single lab\",\n      \"pmids\": [\"36067704\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"DTX2 E3 ubiquitin ligase binds NCOA4 and promotes its ubiquitination and degradation via K48-linked chains, suppressing NCOA4-mediated ferritinophagy and conferring ferroptosis resistance in NSCLC cells.\",\n      \"method\": \"Co-IP, ubiquitination assay with K48 chain characterization, DTX2 KD/OE with NCOA4 and ferritinophagy readouts\",\n      \"journal\": \"Drug resistance updates\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and ubiquitination assay, single lab\",\n      \"pmids\": [\"39366066\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"USP2 deubiquitylase stabilizes NCOA4 by removing K48-linked ubiquitin chains; USP2 binds NCOA4 and prevents its degradation, triggering ferritinophagy and ferroptosis in esophageal squamous cell carcinoma. Hypoxia downregulates USP2, thereby decreasing NCOA4 stability and reducing ferritinophagy-mediated ferroptosis.\",\n      \"method\": \"Co-IP, ubiquitin chain type analysis, USP2 KO/OE in vitro and in vivo xenograft, NCOA4 stability assay\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and genetic KO with in vivo validation, single lab\",\n      \"pmids\": [\"38744953\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"FOXO1 transcription factor directly suppresses NCOA4 expression; knockdown of FOXO1 amplifies NCOA4-mediated ferritinophagy and ferroptosis in cochlear spiral ganglion neurons. Disrupting FOXO1–NCOA4 interaction in NCOA4 knockout mice prevents cisplatin-induced ferroptosis.\",\n      \"method\": \"FOXO1 KD and genetic interaction with NCOA4 KO, cisplatin model, luciferase reporter assay implied by 'directly suppress', hearing loss readouts\",\n      \"journal\": \"Advanced science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic interaction experiments with KO mice, single lab with multiple readouts\",\n      \"pmids\": [\"39206719\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"JWA (ARL6IP5) interacts with NCOA4 at its ferritin binding site, competing with FTH1 binding and thereby inhibiting NCOA4-mediated ferritinophagy and ferroptosis in dopaminergic neurons. Molecular docking, co-immunoprecipitation, and immunofluorescence confirm direct interaction.\",\n      \"method\": \"Molecular docking, Co-IP, immunofluorescence, JWA genetic manipulation in cellular and mouse PD models\",\n      \"journal\": \"Redox biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and molecular docking with genetic manipulation, single lab\",\n      \"pmids\": [\"38744191\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Lipocalin-2 (LCN2) interacts with NCOA4 under high-phosphate conditions, potentially accelerating FTH1 degradation via ferritinophagy-dependent ferroptosis in vascular smooth muscle cells, contributing to vascular calcification in CKD.\",\n      \"method\": \"LCN2 KO mice, Co-IP between LCN2 and NCOA4, LCN2 OE in vascular smooth muscle cells with ferritinophagy and ferroptosis readouts\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and KO mouse with defined vascular calcification phenotype, single lab\",\n      \"pmids\": [\"39613734\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Cryptochrome 1 (CRY1) regulates NCOA4 protein stability by promoting HERC2-mediated ubiquitination and degradation of NCOA4; CRY1 knockdown increases NCOA4-mediated ferritinophagy and causes granulosa cell senescence. KL201 (CRY1 stabilizer) reduces ferritinophagy and improves ovarian function in aged mice.\",\n      \"method\": \"Co-IP, ubiquitination assay, NCOA4 siRNA rescue, CRY1 KD/OE, CRY1-stabilizer in vivo\",\n      \"journal\": \"Free radical biology & medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and ubiquitination assay with genetic rescue, single lab\",\n      \"pmids\": [\"38522484\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"JNK-JUN signaling directly upregulates NCOA4 transcription; JUN binds the Ncoa4 promoter and initiates its transcription. Elevated NCOA4 then increases autophagic ferritin degradation and iron levels, causing chondrocyte ferroptosis and osteoarthritis progression.\",\n      \"method\": \"Promoter ChIP of JUN at Ncoa4, JNK/JUN inhibitor experiments, NCOA4 OE/KD in chondrocytes and mouse intra-articular AAV9 delivery\",\n      \"journal\": \"Free radical biology & medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP and promoter analysis plus in vivo gene delivery, single lab\",\n      \"pmids\": [\"36907253\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"IL-6/STAT3 signaling upregulates NCOA4 protein levels; STAT3 inhibition or knockdown reduces NCOA4 and protects cardiomyocytes from ferritinophagy-mediated ferroptosis; STAT3 overexpression increases NCOA4 expression and ferroptotic events.\",\n      \"method\": \"STAT3 KD/OE, NCOA4 siRNA, high-fat diet mouse model with cardiac injury readouts\",\n      \"journal\": \"Free radical biology & medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic manipulation with pathway epistasis, single lab\",\n      \"pmids\": [\"36940731\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"PTBP1 RNA-binding protein promotes NCOA4 translation by directly binding to the 5'-UTR of NCOA4 mRNA (shown by pull-down assay and dual-luciferase assay); PTBP1 silencing does not affect NCOA4 mRNA stability but reduces NCOA4 protein and consequently ferritinophagy-mediated ferroptosis in liver cancer cells.\",\n      \"method\": \"RNA pull-down, dual-luciferase reporter assay, cycloheximide chase (stability negative), PTBP1 siRNA with ferroptosis readouts\",\n      \"journal\": \"Oncology reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RNA pull-down and reporter assay with negative stability control, single lab\",\n      \"pmids\": [\"36660932\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"NCOA4-mediated ferritinophagy is upregulated in pancreatic ductal adenocarcinoma to sustain iron availability; quantitative proteomics shows that ferritinophagy fuels iron-sulfur cluster protein synthesis to support mitochondrial homeostasis and PDAC tumor progression. NCOA4 targeting leads to tumor growth delay.\",\n      \"method\": \"Patient-derived and murine PDAC models, quantitative proteomics, NCOA4 genetic targeting, iron-sulfur cluster protein analysis\",\n      \"journal\": \"Cancer discovery\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — patient-derived models plus murine models with quantitative proteomics and genetic targeting, multiple readouts\",\n      \"pmids\": [\"35771492\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Thyroid hormone receptor beta (TRβ) cooperates with NCOA4 during terminal human erythroid differentiation; genome-wide analysis shows TH promotes NCOA4 recruitment to chromatin regions near Pol II associated with terminal differentiation transcripts. Ncoa4-/- mice are anemic perinatally and fail to respond to TH with enhanced erythropoiesis, placing NCOA4 as a critical coactivator downstream of TH/TRβ in erythropoiesis.\",\n      \"method\": \"RNA-seq in reticulocytes, ChIP-seq for NCOA4 chromatin recruitment, Ncoa4-KO mouse with TH/TRβ agonist challenge, TH depletion culture assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP-seq, KO mouse, and functional erythropoiesis assays with TH/TRβ axis defined\",\n      \"pmids\": [\"28864529\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Compound 9a directly binds to recombinant NCOA4(383-522) and blocks the NCOA4–FTH1 protein-protein interaction, reducing bioavailable intracellular ferrous iron and inhibiting ferroptosis, establishing this domain as a druggable interface.\",\n      \"method\": \"Binding assay with recombinant NCOA4(383-522), NCOA4-FTH1 interaction inhibition assay, cellular ferroptosis assay, in vivo ischemic stroke rat model\",\n      \"journal\": \"ACS central science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — in vitro binding and interaction inhibition with recombinant protein plus in vivo model, single lab\",\n      \"pmids\": [\"34235259\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"ARA70 (NCOA4) was identified as a ligand-dependent coactivator of the androgen receptor (AR) via yeast two-hybrid; it enhances AR transcriptional activity ~10-fold in the presence of androgen but only marginally activates other steroid receptors (ER, GR, PR) in DU145 prostate cancer cells.\",\n      \"method\": \"Yeast two-hybrid, transient transfection reporter assay in DU145 cells\",\n      \"journal\": \"Proceedings of the National Academy of Sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — yeast two-hybrid plus reporter assay, foundational identification paper replicated by multiple labs\",\n      \"pmids\": [\"8643607\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"ARA70/ELE1alpha interacts in vitro with AR, GR, and ER in a ligand-independent manner via the ligand-binding domain of the receptors and a region corresponding to predicted helix 3 of AR (mutation of L712R greatly reduces AR affinity). ARA70 lacks intrinsic transcription activation domain or histone acetyltransferase activity but interacts with p/CAF histone acetyltransferase and basal transcription factor TFIIB, suggesting a bridging function.\",\n      \"method\": \"In vitro GST pulldown and Co-IP, site-directed mutagenesis of AR L712R, HAT activity assay, reporter assay in DU145/HeLa/COS cells\",\n      \"journal\": \"Molecular endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro pulldown, mutagenesis, and functional assays; single lab with multiple methods\",\n      \"pmids\": [\"9892017\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"ARA70 functions as a ligand-enhanced coactivator for PPARgamma: ARA70 and PPARgamma physically interact by co-immunoprecipitation and mammalian two-hybrid, and cotransfection of AR can squelch PPARgamma-ARA70 transactivation, indicating cross-talk between PPARgamma- and AR-mediated signaling.\",\n      \"method\": \"Co-immunoprecipitation, mammalian two-hybrid, transient transfection reporter assay in DU145 cells, ligand enhancement test\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and functional reporter assay with ligand dose-response, single lab\",\n      \"pmids\": [\"10347167\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"ARA70 promotes AR activity via a FXXLF motif within the ARA70-N2 domain (aa 176-401), not via the LXXLL motif (aa 92-96); the LXXLL motif is required for interaction with other receptors (e.g. PPARgamma). ARA70 enhances AR transactivation by increasing AR protein expression, stability, and nuclear translocation.\",\n      \"method\": \"Domain deletion/mutation analysis, reporter assays, AR expression and stability measurements, nuclear translocation assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — motif mutagenesis with multiple mechanistic readouts, single lab\",\n      \"pmids\": [\"15166229\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Antiandrogens (hydroxyflutamide, bicalutamide, cyproterone acetate, RU58841), genistein, and RU486 promote interaction between AR and ARA70 in a dose-dependent manner in mammalian two-hybrid assay, and cotransfection of AR with ARA70 significantly enhances AR transcriptional activity in DU145 cells, providing a molecular mechanism for antiandrogen agonist activity.\",\n      \"method\": \"Mammalian two-hybrid assay, chloramphenicol acetyltransferase reporter assay, dose-response experiments in DU145 cells\",\n      \"journal\": \"Proceedings of the National Academy of Sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — cell-based interaction and reporter assays, replicated by follow-up work\",\n      \"pmids\": [\"9636157\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"The RFG (NCOA4) coiled-coil domain mediates oligomerization of RET/PTC3, activates its kinase and transforming activity, mediates physical association of RET/PTC3 with endogenous RFG protein (making RFG a substrate for RET/PTC3 kinase), and re-localizes RET/PTC3 to the membrane/particulate cell compartment.\",\n      \"method\": \"Co-IP, kinase autophosphorylation assay, focus-formation transformation assay, subcellular fractionation, coiled-coil domain deletion mutants\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and kinase assay with domain deletion mutants, single lab\",\n      \"pmids\": [\"11313992\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Reduced mechanical tension decreases intracellular free iron by enhancing FTH1 expression and diminishing NCOA4, which mediates FTH1 phase separation-induced ferritinophagy. Targeting NCOA4 rescues ferroptosis susceptibility under low mechanical tension through modulation of FTH1 phase separation-driven autophagy.\",\n      \"method\": \"Mechanical tension manipulation, NCOA4 genetic targeting, FTH1 phase separation assay, ferroptosis readouts\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic manipulation with mechanically defined conditions and phase separation readout, single lab\",\n      \"pmids\": [\"39988734\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Activated macrophages and monocytes secrete NCOA4 via autophagy-dependent lysosomal exocytosis (mediated by ATG5 and MCOLN1), and extracellular NCOA4 acts as a danger-associated molecular pattern that activates NF-κB by promoting NFKBIA degradation in a pattern-recognition receptor AGER-dependent (not TLR4-dependent) manner.\",\n      \"method\": \"ATG5/MCOLN1 genetic depletion, lysosomal exocytosis assay, AGER KO macrophages, endotoxemia/CLP mouse model, anti-NCOA4 neutralizing antibody\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple genetic knockouts and in vivo models, single lab\",\n      \"pmids\": [\"38916095\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"NCOA4 is a multifunctional protein best characterized as the selective autophagy cargo receptor (ferritinophagy) that binds ferritin heavy chain (FTH1) via its C-terminal domain—which harbors a [3Fe-4S] cluster acting as an iron sensor—to deliver ferritin to lysosomes for iron release; NCOA4 protein abundance is regulated by iron-dependent HERC2-mediated ubiquitination/proteasomal degradation (favored when the [3Fe-4S] cluster is loaded or NCOA4 forms iron-induced condensates), ATM-mediated phosphorylation, and multiple E3 ligases (TRIM7, DTX2) and deubiquitylases (USP2), while transcriptional control by JNK-JUN and STAT3 modulates its expression; NCOA4-mediated ferritinophagy is critical for systemic and erythroid iron homeostasis, supports heme synthesis and hemoglobin formation in developing red cells through a PCBP1-ferritin-NCOA4 axis, and drives ferroptosis sensitivity by controlling labile iron pools; additionally, NCOA4 inhibits DNA replication origin activation by interacting with MCM7/CMG helicase, linking iron bioavailability to DNA replication control, and—in its original nuclear receptor context—functions as a ligand-dependent coactivator of AR, PPARγ, TRβ, and ERα via distinct interaction motifs.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"NCOA4 is the selective autophagy cargo receptor for ferritin (ferritinophagy), coupling intracellular iron status to lysosomal ferritin turnover and thereby governing the cellular labile iron pool [#0]. It binds ferritin heavy chain (FTH1) directly through a C-terminal element that recognizes a key surface arginine on FTH1, while associating with ATG8 proteins to deliver ferritin to lysosomes; this interaction is required for ferritin degradation and iron release [#0, #1, #4]. NCOA4 homodimerizes and engages FTH1 multivalently to drive phase separation of ferritin into liquid-like condensates that are engulfed by autophagosomes and endosomes via TAX1BP1 [#8, #9]. Iron sensing is intrinsic to the protein: its C-terminal FTH1-binding domain carries a [3Fe-4S] cluster, and holo-NCOA4 is recognized by the HERC2 ubiquitin ligase for proteasomal degradation under iron repletion, whereas apo-NCOA4 binds FTH1 to promote ferritinophagy under iron depletion [#11]. NCOA4 abundance and activity are further tuned by ATM-mediated phosphorylation [#13], additional E3 ligases and a deubiquitylase (TRIM7, DTX2, USP2) [#16, #17, #18], and transcriptional/translational inputs [#23, #24, #25]. Through this iron-release function, NCOA4 is essential for systemic, macrophage, and erythroid iron homeostasis and supports heme and hemoglobin synthesis via a PCBP1-ferritin-NCOA4 vectorial iron-transfer axis [#2, #3, #5, #7], and it is a principal determinant of ferroptosis sensitivity by controlling labile iron [#13, #16, #28]. Independently of iron release, NCOA4 interacts with MCM7 and restrains CMG helicase-mediated DNA replication origin activation, linking iron bioavailability to genome stability [#10]. In its original nuclear-receptor context, NCOA4 (ARA70) acts as a ligand-dependent coactivator of the androgen receptor through an FXXLF motif and of PPARgamma through an LXXLL motif, bridging receptors to the basal transcription machinery, and cooperates with TRbeta during erythroid differentiation [#27, #29, #32].\",\n  \"teleology\": [\n    {\n      \"year\": 2014,\n      \"claim\": \"Established NCOA4's defining function by identifying it as the selective cargo receptor that targets ferritin to lysosomes, answering how cells mobilize stored iron through autophagy.\",\n      \"evidence\": \"Quantitative autophagosome proteomics with reciprocal Co-IP of NCOA4 and ferritin subunits and knockdown/knockout ferritin-degradation readouts\",\n      \"pmids\": [\"24695223\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define the molecular interaction interface\", \"Did not explain how iron status switches the receptor on or off\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Defined the NCOA4-FTH1 binding interface and revealed iron-dependent HERC2 ubiquitination as the off-switch, showing how ferritinophagy is suppressed under iron excess.\",\n      \"evidence\": \"Mutagenesis of the FTH1/NCOA4 interface, Co-IP, depletion-reconstitution, ubiquitination assays, and zebrafish genetics\",\n      \"pmids\": [\"26436293\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular nature of the iron signal sensed by NCOA4 not yet identified\", \"Structural basis of HERC2 recognition unresolved\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Demonstrated NCOA4 is essential for systemic iron homeostasis in vivo and mapped the ferritin-targeting activity to the C-terminal domain (aa 239-614).\",\n      \"evidence\": \"Knockout mouse with dietary iron manipulation plus domain reconstitution in null MEFs\",\n      \"pmids\": [\"26776506\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cell-type-specific contributions not dissected\", \"Did not resolve erythroid versus systemic mechanisms\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Showed ferritinophagy feeds iron into heme synthesis during erythropoiesis and works in series with PCBP1 to achieve vectorial iron transfer through ferritin.\",\n      \"evidence\": \"siRNA depletion in an erythroid differentiation model and Pcbp1-KO mouse ex vivo erythroid differentiation with heme/hemoglobin assays\",\n      \"pmids\": [\"28375153\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry and kinetics of PCBP1-NCOA4 coordination not quantified\", \"Mechanism of iron delivery to mitochondria unresolved\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Placed NCOA4 in the nuclear-receptor pathway during erythropoiesis as a TH/TRbeta coactivator recruited to chromatin near terminal differentiation genes.\",\n      \"evidence\": \"RNA-seq, NCOA4 ChIP-seq, and Ncoa4-KO mouse with TH/TRbeta agonist challenge\",\n      \"pmids\": [\"28864529\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relationship between nuclear coactivator and cytoplasmic ferritinophagy roles not integrated\", \"Direct DNA/chromatin targets incompletely mapped\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Quantified the NCOA4-ferritin interaction thermodynamically and showed NCOA4 binding itself blocks chemical iron mobilization from the ferritin shell.\",\n      \"evidence\": \"Isothermal titration calorimetry and in vitro iron oxidation/mobilization kinetics with recombinant NCOA4(383-522)\",\n      \"pmids\": [\"32608971\", \"28754384\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vitro reconstitution may not capture cellular condensate context\", \"Physiological consequence of mobilization inhibition unclear\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Reframed ferritinophagy as condensate-driven, showing NCOA4 homodimerization and multivalent FTH1 binding nucleate ferritin condensates captured by autophagosomes and endosomes via TAX1BP1.\",\n      \"evidence\": \"Live-cell imaging, 3D correlative light-electron microscopy, and dimerization/FTH1-interaction mutants\",\n      \"pmids\": [\"36066504\", \"35318808\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How iron status toggles condensate composition not fully resolved\", \"Selection between macro- and micro-ferritinophagy routes incompletely defined\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Uncovered an iron-independent function: NCOA4 binds MCM7 and restrains replication origin firing, linking iron bioavailability to controlled DNA replication and genome stability.\",\n      \"evidence\": \"Xenopus egg-extract depletion-reconstitution, Co-IP with MCM7, and NCOA4-KO MEFs with DNA fiber and replication-stress readouts\",\n      \"pmids\": [\"24910095\", \"35977492\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of MCM7/CMG inhibition unknown\", \"How this nuclear role coordinates with cytoplasmic ferritinophagy unresolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Showed NCOA4-driven ferritinophagy sustains iron-sulfur cluster protein synthesis and mitochondrial homeostasis to fuel pancreatic cancer progression, identifying it as a tumor dependency.\",\n      \"evidence\": \"Patient-derived and murine PDAC models with quantitative proteomics and genetic NCOA4 targeting\",\n      \"pmids\": [\"35771492\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Generality across tumor types not established here\", \"Mechanism coupling ferritinophagy to Fe-S cluster supply not detailed\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Identified the molecular iron sensor: a [3Fe-4S] cluster in the C-terminal domain determines whether NCOA4 is degraded by HERC2 (holo) or binds FTH1 to promote ferritinophagy (apo).\",\n      \"evidence\": \"In vitro Fe-S cluster reconstitution, mass spectrometry, and differential Co-IP of holo versus apo-NCOA4 with HERC2/FTH1\",\n      \"pmids\": [\"38159858\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo confirmation of the cluster's regulatory role lacking\", \"Cluster assembly/disassembly machinery not identified\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Layered additional regulation onto NCOA4 stability and activity through ATM phosphorylation, oxygen tension, and pathogen-driven TRIM21/HERC2 signaling, tuning ferritinophagy and ferroptosis.\",\n      \"evidence\": \"ATM inhibition/KO with phospho and ferroptosis assays; hypoxia chamber and Fe-S/HERC2 analyses; macrophage Mtb infection with myeloid-specific Ncoa4 KO mice\",\n      \"pmids\": [\"36752571\", \"37059186\", \"37066876\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"ATM phosphosites on NCOA4 not mapped\", \"Oxygen and infection inputs studied in single labs\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Resolved a regulatory network of E3 ligases, a deubiquitylase, transcription factors, an RNA-binding protein, and competitive binders that set NCOA4 levels and thereby ferroptosis sensitivity across disease contexts.\",\n      \"evidence\": \"Co-IP and K48-ubiquitination assays (TRIM7, DTX2, USP2); promoter/ChIP and reporter analyses (JNK-JUN, STAT3, FOXO1, PTBP1); competitive-binding Co-IP (JWA/ARL6IP5, LCN2, CRY1) with cellular and mouse models\",\n      \"pmids\": [\"36067704\", \"39366066\", \"38744953\", \"36907253\", \"36940731\", \"39206719\", \"36660932\", \"38744191\", \"39613734\", \"38522484\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Most regulators validated in single labs and disease-specific contexts\", \"Hierarchy and interplay among these regulators not integrated\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Revealed a non-receptor extracellular role: secreted NCOA4 acts as a danger-associated molecular pattern activating NF-kB via AGER, expanding its function beyond intracellular iron handling.\",\n      \"evidence\": \"ATG5/MCOLN1 depletion, lysosomal exocytosis assays, AGER-KO macrophages, and endotoxemia/CLP mouse models with neutralizing antibody\",\n      \"pmids\": [\"38916095\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab finding awaiting independent confirmation\", \"Relationship of secreted NCOA4 to its iron-handling pool unclear\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How NCOA4's distinct activities—ferritinophagy, MCM7-dependent replication control, and nuclear-receptor coactivation—are coordinated within a single cell, and how the [3Fe-4S] iron sensor is loaded and unloaded in vivo, remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model linking cytoplasmic, nuclear, and secreted functions\", \"No structural model of NCOA4 in any of its complexes\", \"In vivo Fe-S cluster cycling machinery unidentified\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0038024\", \"supporting_discovery_ids\": [0, 1, 8]},\n      {\"term_id\": \"GO:0140299\", \"supporting_discovery_ids\": [11, 12]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [27, 29, 31, 32]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 30]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0, 9]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [27, 29, 32]},\n      {\"term_id\": \"GO:0005764\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [0, 1, 8]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [2, 3, 26]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [13, 16, 28]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [27, 29]},\n      {\"term_id\": \"R-HSA-69306\", \"supporting_discovery_ids\": [10]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"FTH1\", \"HERC2\", \"MCM7\", \"TAX1BP1\", \"AR\", \"PPARG\", \"TRIM7\", \"USP2\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}