{"gene":"DUOX1","run_date":"2026-04-28T17:46:03","timeline":{"discoveries":[{"year":2009,"finding":"DUOX1 activity is calcium-dependent, requiring functional EF-hand motifs, and is specifically stimulated by cAMP/PKA signaling via phosphorylation of Ser955, whereas DUOX2 is regulated by PKC/phorbol esters. Co-expression with maturation factor DUOXA1 is required for membrane expression and enzymatic activity.","method":"Functional H2O2 assay with co-expression of DUOX1/DUOXA1, site-directed mutagenesis of EF-hand motifs, forskolin stimulation, phosphorylation mapping, confirmed in human thyroid cells","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — in vitro functional assay with mutagenesis and pharmacological dissection, replicated in primary thyroid cells","pmids":["19144650"],"is_preprint":false},{"year":2020,"finding":"Cryo-EM structures of mouse DUOX1-DUOXA1 complex reveal atomic details of DUOX1-DUOXA1 interaction, a lipid-mediated NADPH-binding pocket, and the electron transfer path. A dimer-of-dimers configuration represents an inactive state, indicating an oligomerization-dependent regulatory mechanism.","method":"Cryo-EM structure determination in absence and presence of NADPH substrate, biochemical analysis of oligomeric states","journal":"Nature structural & molecular biology","confidence":"High","confidence_rationale":"Tier 1 — cryo-EM structures with biochemical validation, multiple conformational states resolved","pmids":["32929281"],"is_preprint":false},{"year":2010,"finding":"DUOX1 binds to inositol 1,4,5-trisphosphate receptor 1 (IP3R1) in CD4+ T cells and is required for early TCR-stimulated H2O2 production. DUOX1-derived H2O2 inactivates SHP-2 phosphatase, promoting ZAP-70 phosphorylation at Tyr-319 and its association with Lck and CD3ζ, thereby creating a positive feedback loop in TCR signaling.","method":"Co-immunoprecipitation of DUOX1 with IP3R1, siRNA knockdown, stable shRNA knockdown, measurement of H2O2 production, TCR signaling readouts (ZAP-70 phosphorylation, Ca2+ entry, ERK activation, cytokine production)","journal":"Science signaling","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP, KD with defined signaling phenotype, multiple orthogonal readouts","pmids":["20682913"],"is_preprint":false},{"year":2013,"finding":"ATP-mediated DUOX1 activation involves P2Y2 receptor stimulation, which recruits Src and DUOX1 into a signaling complex. DUOX1-derived H2O2 oxidizes cysteine residues within Src and ADAM17, activating the sheddase to release EGFR ligands, leading to EGFR transactivation, ERK/NF-κB activation, and IL-8 production.","method":"siRNA and shRNA silencing of DUOX1, thiol-specific biotin labeling to detect cysteine oxidation of Src and ADAM17, P2Y2R antagonists, Co-IP of Src and DUOX1, EGFR transactivation assays","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods including thiol-labeling, Co-IP, and genetic KD with defined signaling phenotype","pmids":["23349873"],"is_preprint":false},{"year":2009,"finding":"The human DUOX1 N-terminal peroxidase-like domain (residues 1–593) does not bind heme and has no intrinsic peroxidase activity when expressed in isolation, unlike its C. elegans ortholog which covalently binds heme and has modest peroxidase activity.","method":"Baculovirus expression and purification of isolated peroxidase domains from human and C. elegans DUOX1, heme-binding assays, peroxidase activity assays, superoxide dismutase activity assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — purified recombinant domain with in vitro enzymatic assays and direct biochemical characterization","pmids":["19460756"],"is_preprint":false},{"year":2016,"finding":"ATP-dependent EGFR transactivation involves sequential sulfenylation then S-glutathionylation of Cys residues in EGFR and Src via DUOX1-derived H2O2. Sulfenylation (not S-glutathionylation) is the activating modification; the C797S EGFR variant abolishes H2O2-induced kinase activity enhancement, confirming Cys-797 as the redox-sensitive regulatory residue.","method":"In vitro kinase assay with recombinant Src and EGFR treated with H2O2 or GSSG, C797S EGFR mutagenesis, dimedone-based sulfenylation trapping, siRNA/shRNA DUOX1 silencing in airway cells","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — in vitro reconstitution with mutagenesis plus cellular validation with KD","pmids":["27650496"],"is_preprint":false},{"year":2014,"finding":"DUOX1 is critical for ATP-stimulated transient H2O2 production and protein S-glutathionylation in airway epithelial cells. Identified S-glutathionylated targets include β-actin, peroxiredoxin 1, Src, and MAPK phosphatase 1, linking DUOX1 to cytoskeletal dynamics and MAPK signaling in cell migration.","method":"Biotin-tagged GSH cell labeling, avidin purification, global proteomics, DUOX1 shRNA in H292 cells and primary tracheal epithelial cells from DUOX1-deficient mice","journal":"Redox biology","confidence":"High","confidence_rationale":"Tier 2 — global proteomics with genetic KO confirmation and multiple orthogonal methods","pmids":["24624333"],"is_preprint":false},{"year":2009,"finding":"ATP-mediated DUOX1 activation in airway epithelial cells leads to intracellular H2O2-dependent EGFR/ERK activation and ADAM17-mediated EGFR ligand shedding, resulting in IL-8 production in response to bacterial stimuli.","method":"Catalase (extracellular and intracellular), EGFR/ERK inhibitors, siRNA knockdown of DUOX1, measurement of ATP release, ADAM17 activation, and IL-8 release upon bacterial stimuli","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — genetic KD with pharmacological dissection and defined pathway position","pmids":["19386603"],"is_preprint":false},{"year":2016,"finding":"DUOX1 mediates allergen-induced persistent EGFR activation through cysteine oxidation within EGFR and Src, driving amphiregulin production, mucous metaplasia, subepithelial fibrosis, and airway remodeling. Targeted siRNA or pharmacological inhibition of DUOX1 reversed established allergic inflammation.","method":"DUOX1-deficient mice, DUOX1-targeted siRNA intratracheal delivery, pharmacological NADPH oxidase inhibitors, HDM allergen mouse model, measurement of EGFR cysteine oxidation","journal":"JCI insight","confidence":"High","confidence_rationale":"Tier 2 — genetic KO and siRNA KD in vivo with multiple defined phenotypic readouts and mechanism","pmids":["27812543"],"is_preprint":false},{"year":2021,"finding":"DUOX1-derived H2O2 promotes TGF-β1/Smad3 signaling by preventing phospho-Smad3 degradation. Mechanistically, DUOX1 inhibits the interaction between phospho-Smad3 and the ubiquitin ligase NEDD4L, preventing NEDD4L-mediated ubiquitination and proteasomal targeting of phospho-Smad3.","method":"Primary human and mouse lung fibroblasts, DUOX1-deficient mice (DUOX1+/-, DUOX1-/-), TGF-β1 stimulation, Smad3 phosphorylation/ubiquitination assays, Co-IP of phospho-Smad3 with NEDD4L","journal":"The European respiratory journal","confidence":"High","confidence_rationale":"Tier 2 — genetic KO model, Co-IP, ubiquitination assay, mechanistic pathway identification in primary cells","pmids":["32764116"],"is_preprint":false},{"year":2021,"finding":"DUOX1 and DUOX2 synthesize NAADP from NAADPH in vitro, functioning as NAADP-forming enzymes. In T cells, DUOX1 and DUOX2 (but not NOX1 or NOX2) are required for global Ca2+ signaling 4–12 min after TCR activation, while DUOX2 specifically controls early Ca2+ microdomains in the first 15 s.","method":"In vitro enzymatic assay of NAADP formation, mouse T cells with conditional knockout of Duoxa1/Duoxa2, Duox1 KO, Duox2 KO, and Nox1/Nox2 KO; Ca2+ imaging (local microdomains and global)","journal":"Science signaling","confidence":"High","confidence_rationale":"Tier 1+2 — in vitro reconstitution of enzymatic activity plus genetic KO with direct Ca2+ measurement","pmids":["34784249"],"is_preprint":false},{"year":2010,"finding":"DUOX1 is the NADPH oxidase responsible for calcium-stimulated H2O2 production in urothelial cells. TRPV4 calcium channel activation triggers calcium signals that stimulate DUOX1-dependent H2O2 production, and Duox1 knockout mice show altered pressure responses in the urinary bladder.","method":"DUOX1 gene-deficient mouse model, selective TRPV4 agonists, H2O2 measurement in urothelial cells, bladder pressure response assays","journal":"Free radical biology & medicine","confidence":"High","confidence_rationale":"Tier 2 — genetic KO with defined cellular and organ-level phenotype, pharmacological calcium channel activation","pmids":["21146788"],"is_preprint":false},{"year":2007,"finding":"Duox1 is the main source of H2O2 in the rat thyroid cell line PCCl3. siRNA-mediated silencing of Duox1 reduces H2O2 production, and re-expression of rat Duox1 (but only partial rescue with human DUOX1) restores enzymatic activity.","method":"siRNA knockdown of Duox1 in PCCl3 cells, H2O2 production assays, lentiviral re-expression rescue experiments, Western blotting for glycosylated protein","journal":"Experimental cell research","confidence":"High","confidence_rationale":"Tier 2 — genetic KD with rescue experiment and defined enzymatic phenotype","pmids":["17643428"],"is_preprint":false},{"year":2024,"finding":"DUOX1 apical sorting in polarized epithelial cells depends on its maturation factor DUOXA1. N-glycosylation of DUOXA1 is required for correct apical targeting of DUOX1; glycosylation-defective DUOXA1 causes DUOX1 mistargeting to the basolateral membrane.","method":"Co-expression in MDCK polarized epithelial cells, N-glycosylation mutants of DUOXA1, immunofluorescence localization, domain-swap experiments between DUOXA1 and DUOXA2","journal":"Genes to cells","confidence":"High","confidence_rationale":"Tier 2 — direct localization experiment with mutagenesis and functional consequence (mistargeting)","pmids":["39126279"],"is_preprint":false},{"year":2015,"finding":"DUOX1-derived H2O2 promotes Cxcl8 expression and late-phase neutrophil recruitment via a JNK/c-JUN/AP-1 signaling pathway and histone modifications (H3K4me3, H3K9ac, H3K9me3) at the cxcl8 promoter, but not via ERK or NF-κB.","method":"Zebrafish in vivo model (ortholog), Duox1 morpholino knockdown, H2O2 exposure, pharmacological inhibitors of JNK/ERK/NF-κB, chromatin immunoprecipitation (ChIP) for histone modifications at cxcl8 promoter","journal":"Journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 — zebrafish ortholog, ChIP for epigenetic mechanism, genetic KD with pharmacological pathway dissection","pmids":["25582859"],"is_preprint":false},{"year":2015,"finding":"Ionizing radiation activates p38 MAPK, which increases IL-13 expression, leading to upregulation of DUOX1 and sustained DUOX1-dependent H2O2 production for days after irradiation. This persistent H2O2 production causes DNA double-strand breaks and growth arrest; catalase pretreatment or DUOX1 siRNA knockdown abrogates IR-induced DNA damage.","method":"Human thyroid cell line and primary thyrocytes, siRNA knockdown of DUOX1, catalase treatment, p38 MAPK inhibitors, measurement of H2O2, DNA damage markers (γH2AX), dose-dependent irradiation","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — genetic KD with mechanistic pathway placement (p38/IL-13/DUOX1), multiple methods, confirmed in primary cells","pmids":["25848056"],"is_preprint":false},{"year":2007,"finding":"DUOX1 expression and its maturation factor DUOXA1 are developmentally regulated in human fetal lung alveolar type II cells, with strong induction by DCI (dexamethasone/cAMP/IBMX) hormone mixture. DUOX1 localizes to the apical cell pole and mediates H2O2 and acid production in differentiated type II cells.","method":"siRNA knockdown of DUOX1 in human fetal lung cells, DCI differentiation, apical localization by immunofluorescence, H2O2 production assays, DPI inhibitor, transepithelial electrical measurements","journal":"American journal of physiology. Lung cellular and molecular physiology","confidence":"Medium","confidence_rationale":"Tier 2 — siRNA KD with defined functional phenotype and localization, single lab","pmids":["17337509"],"is_preprint":false},{"year":2014,"finding":"Testosterone activates DUOX1 in skin keratinocytes via GPRC6A receptor, which couples to Gq protein to generate IP3 and intracellular Ca2+ mobilization, leading to DUOX1-dependent H2O2 production and caspase-3-mediated apoptosis.","method":"GPRC6A siRNA silencing, Ca2+ imaging, H2O2 measurement, caspase-3 activation assay, 3D skin equivalent model","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 — genetic silencing with defined pathway (GPRC6A-Gq-IP3-Ca2+-DUOX1-H2O2-apoptosis), single lab","pmids":["25164816"],"is_preprint":false},{"year":2017,"finding":"Autophagy proteins, specifically ATG5, regulate DUOX1 localization to the apical membrane in airway epithelial cells during chronic IL-13 stimulation. ATG5 depletion reduces DUOX1-dependent intracellular superoxide production without affecting total DUOX1 protein levels, indicating autophagy controls DUOX1 trafficking rather than expression.","method":"siRNA knockdown of DUOX1 and ATG5 in primary human tracheobronchial epithelial cells, OVA mouse model, EPR spectroscopy for superoxide, LC3BII autophagosome marker, confocal immunostaining of DUOX1 localization","journal":"Redox biology","confidence":"Medium","confidence_rationale":"Tier 2 — genetic KD with direct localization readout and defined mechanism linking autophagy to DUOX1 apical trafficking, single lab","pmids":["28982074"],"is_preprint":false},{"year":2016,"finding":"DUOX1 silencing in lung epithelial cells causes loss of E-cadherin, epithelial-to-mesenchymal transition (EMT) features, increased vimentin/collagen, and resistance to EGFR tyrosine kinase inhibitors. Conversely, DUOX1 overexpression in A549 cells reverses EMT. DUOX1 silencing also increases cancer stem cell markers CD133 and ALDH1.","method":"RNAi-mediated stable DUOX1 knockdown and overexpression, morphology assessment, barrier function, E-cadherin/vimentin protein measurement, migration and anchorage-independent growth assays, in vivo invasion model","journal":"Oncogenesis","confidence":"Medium","confidence_rationale":"Tier 2 — KD/OE with multiple phenotypic readouts, single lab but multiple orthogonal assays","pmids":["27694834"],"is_preprint":false},{"year":2018,"finding":"Duox1-derived H2O2 negatively regulates proliferative activity of primary splenic B cells. BCR stimulation with IL-4 upregulates Duox1 expression and H2O2 production; Duox1-/- B cells show enhanced proliferation without change in Ig isotype production. Extracellular catalase mimics the Duox1-/- proliferative phenotype.","method":"Duox1-/- mice, CD19+ B cell isolation, BCR stimulation + IL-4, H2O2 measurement, proliferation assay, in vivo immunization with T cell-dependent and -independent antigens, catalase treatment","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 2 — genetic KO mouse confirmed in vitro and in vivo with multiple assays, catalase rescue experiment","pmids":["30559322"],"is_preprint":false},{"year":2016,"finding":"DUOX1 and Duox1/2 mediate PDGF-induced intracellular H2O2 production and PKB/Akt phosphorylation in fibroblasts and mesenchymal stromal cells, driving cell migration. Silencing Duox1/2 reduces PDGF-stimulated H2O2, Akt phosphorylation, and migration without affecting ERK1/2.","method":"Real-time PCR for NOX isoforms, siRNA silencing of Duox1/2 or Nox4, live H2O2 imaging, migration assays, Western blotting for Akt and ERK phosphorylation","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 — genetic KD with defined signaling pathway, single lab","pmids":["27110716"],"is_preprint":false},{"year":2022,"finding":"Macrophage-intrinsic DUOX1 contributes to type 2 inflammation, mucus metaplasia, and macrophage recruitment during chronic allergen-driven inflammation. Conditional DUOX1 deletion in monocyte/macrophage lineage impaired type 2 cytokine production and macrophage activation in chronic HDM-driven allergic airway inflammation.","method":"Conditional cell-type-specific DUOX1 knockout (monocyte/macrophage lineage using Cre-lox), HDM allergen mouse model, type 2 cytokine measurement, mucus staining, macrophage recruitment assays","journal":"Mucosal immunology","confidence":"High","confidence_rationale":"Tier 2 — conditional cell-type-specific KO with defined phenotypic readouts, cell-intrinsic mechanism demonstrated","pmids":["35654836"],"is_preprint":false},{"year":2026,"finding":"Macrophage-intrinsic DUOX1 mediates profibrotic macrophage activation through oxidative activation of Src kinase via cysteine oxidation, promoting MoMac recruitment, collagen production, and EGFR ligand production for macrophage-fibroblast cross-talk. Conditional myeloid-specific DUOX1 ablation dramatically attenuated pulmonary fibrosis.","method":"LysM-Cre conditional DUOX1 KO, BMDM in vitro migration and profibrotic activation assays, Src cysteine oxidation by biotin-labeling, saracatinib (Src inhibitor) treatment, collagen quantification, oxygen saturation measurement","journal":"American journal of respiratory cell and molecular biology","confidence":"High","confidence_rationale":"Tier 2 — conditional genetic KO with mechanistic biochemical validation (Src oxidation) and pharmacological inhibition, multiple orthogonal methods","pmids":["40986746"],"is_preprint":false},{"year":2018,"finding":"DUOX1-mediated H2O2 production regulates sodium transport in H441 bronchiolar epithelial cells. Tonic DUOX1-derived H2O2 activates amiloride-sensitive ENaC currents in dome-forming cells, while H2O2 feeds back negatively on ENaC gene expression.","method":"siRNA/DUOX1 knockdown, exogenous catalase, H2O2 dose-response, nystatin-perforated whole-cell patch-clamp for ENaC currents, RT-PCR, immunocytochemistry","journal":"Acta physiologica","confidence":"Medium","confidence_rationale":"Tier 2 — electrophysiology with defined H2O2 mechanism, but single lab","pmids":["30052308"],"is_preprint":false},{"year":2023,"finding":"HIF-2α promotes DUOX1 transcription in response to arsenic exposure; DUOX1-derived ROS suppresses GPX4 expression, promoting ferroptosis and kidney injury. Dual luciferase assay confirmed HIF-2α directly drives DUOX1 promoter activity.","method":"siRNA knockdown of DUOX1 in HK-2 cells, dual luciferase reporter assay, in vivo mouse model, GPX4 western blotting, ROS/iron quantification","journal":"The Science of the total environment","confidence":"Medium","confidence_rationale":"Tier 2 — luciferase reporter for transcriptional mechanism, genetic KD with defined phenotype, single lab","pmids":["37879473"],"is_preprint":false},{"year":2019,"finding":"DUOX1 R1307Q missense mutation and DUOXA1 R56W missense mutation each decrease DUOX1 protein expression and H2O2 generation, demonstrating that intact DUOXA1 is required for full DUOX1 H2O2-generating activity.","method":"Functional H2O2 generation assays with transfected mutant DUOX1/DUOXA1 constructs, RT-PCR and protein expression analysis","journal":"Frontiers in endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 — functional assay of disease mutations demonstrating DUOXA1 requirement for DUOX1 activity, single lab","pmids":["31428054"],"is_preprint":false}],"current_model":"DUOX1 is a calcium-dependent NADPH oxidase that requires co-assembly with its maturation factor DUOXA1 (which controls apical membrane sorting via N-glycosylation) to form an active complex that produces H2O2 through a lipid-mediated NADPH-binding pocket and defined electron transfer path; its activity is positively regulated by PKA-mediated phosphorylation at Ser955 and by calcium/EF-hand motifs, and DUOX1-derived H2O2 mediates diverse downstream signaling through oxidation of cysteine residues in targets including Src (activating), EGFR (at Cys-797, activating), ADAM17, and SHP-2 (inactivating), thereby driving innate epithelial defense, EGFR transactivation, TGF-β/Smad3 amplification (by blocking NEDD4L-mediated phospho-Smad3 ubiquitination), T cell and B cell receptor signaling modulation, and NAADP synthesis for Ca2+ microdomain formation during lymphocyte activation."},"narrative":{"teleology":[{"year":2007,"claim":"Establishing that DUOX1 is the dominant H₂O₂ source in thyroid cells resolved which NOX family member fulfills this function, while parallel work showed DUOX1 is developmentally regulated and apically localized in lung epithelial cells.","evidence":"siRNA knockdown with re-expression rescue in PCCl3 thyroid cells; siRNA KD in differentiating fetal lung alveolar type II cells with immunofluorescence localization","pmids":["17643428","17337509"],"confidence":"High","gaps":["Mechanism of DUOX1 activation and co-factor requirements not yet defined","Species-specific differences in rescue efficiency unexplained"]},{"year":2009,"claim":"Defining the regulatory logic of DUOX1 activation—calcium/EF-hand dependence, PKA/Ser955 phosphorylation, and obligate DUOXA1 co-expression—established the enzymatic control architecture and resolved how DUOX1 differs from DUOX2 (PKC-regulated).","evidence":"Site-directed mutagenesis of EF-hand motifs, phosphorylation mapping, forskolin stimulation, co-expression with DUOXA1 in reconstituted systems and primary thyroid cells","pmids":["19144650"],"confidence":"High","gaps":["Structural basis of DUOXA1 requirement unknown","Downstream signaling targets of DUOX1-derived H₂O₂ not identified"]},{"year":2009,"claim":"Demonstrating that the human DUOX1 peroxidase-like domain lacks heme binding and peroxidase activity established that DUOX1 is an H₂O₂ generator rather than a peroxidase, distinguishing it from invertebrate orthologs.","evidence":"Purified recombinant peroxidase domains from human and C. elegans, heme-binding and enzymatic assays","pmids":["19460756"],"confidence":"High","gaps":["Structural basis for loss of heme binding not resolved","Whether the peroxidase-like domain has non-enzymatic regulatory functions unknown"]},{"year":2009,"claim":"Linking DUOX1 to EGFR transactivation via ADAM17-mediated ligand shedding and IL-8 production placed DUOX1 upstream of a major epithelial innate defense signaling axis.","evidence":"siRNA knockdown in airway epithelial cells, catalase compartmentalization, EGFR/ERK inhibitors, ADAM17 activation assays upon bacterial stimulation","pmids":["19386603"],"confidence":"High","gaps":["Direct molecular targets of DUOX1-derived H₂O₂ in EGFR transactivation not identified","Cysteine residue specificity unknown"]},{"year":2010,"claim":"Discovering that DUOX1 binds IP3R1 and that its H₂O₂ inactivates SHP-2 to amplify ZAP-70 phosphorylation revealed DUOX1 as a redox-dependent positive feedback regulator of TCR signaling.","evidence":"Co-immunoprecipitation of DUOX1–IP3R1, siRNA/shRNA knockdown in CD4+ T cells with TCR signaling readouts","pmids":["20682913"],"confidence":"High","gaps":["Whether SHP-2 oxidation is direct or indirect not fully resolved","Stoichiometry and dynamics of DUOX1-IP3R1 interaction unknown"]},{"year":2010,"claim":"Showing that Duox1 knockout mice have altered bladder pressure responses and that TRPV4-triggered Ca²⁺ activates DUOX1-dependent H₂O₂ in urothelium extended DUOX1 function beyond thyroid and airway to mechanosensory epithelial biology.","evidence":"Duox1 gene-deficient mice, TRPV4 agonists, H₂O₂ measurement in urothelial cells, bladder pressure assays","pmids":["21146788"],"confidence":"High","gaps":["Downstream targets of DUOX1-derived H₂O₂ in urothelium unidentified","Whether DUOX1 is required for normal bladder function or only stress responses unclear"]},{"year":2013,"claim":"Identifying Src and ADAM17 as direct cysteine-oxidized targets of DUOX1-derived H₂O₂ provided the first molecular mechanism for how DUOX1 activates the EGFR transactivation pathway.","evidence":"Thiol-specific biotin labeling to detect cysteine oxidation in Src and ADAM17, Co-IP of Src–DUOX1, P2Y2R antagonists in airway epithelial cells","pmids":["23349873"],"confidence":"High","gaps":["Specific oxidized cysteine residues in Src and ADAM17 not mapped","Whether oxidation is direct (DUOX1-proximal) or relay-mediated unknown"]},{"year":2014,"claim":"Global proteomic identification of DUOX1-dependent S-glutathionylated targets (β-actin, Prx1, Src, MKP-1) broadened the scope of DUOX1 redox signaling beyond EGFR to cytoskeletal dynamics and MAPK regulation.","evidence":"Biotin-GSH labeling with avidin purification and proteomics in DUOX1-shRNA H292 cells and DUOX1-deficient mouse tracheal epithelial cells","pmids":["24624333"],"confidence":"High","gaps":["Functional validation of individual S-glutathionylation events incomplete","Kinetics and reversibility of these modifications not characterized"]},{"year":2015,"claim":"Demonstrating that ionizing radiation sustains DUOX1-dependent H₂O₂ via p38 MAPK/IL-13 upregulation, causing persistent DNA damage, revealed DUOX1 as an amplifier of radiation-induced genotoxicity in thyroid.","evidence":"siRNA knockdown and catalase treatment in thyroid cells, p38 inhibitors, γH2AX foci quantification after irradiation","pmids":["25848056"],"confidence":"High","gaps":["Whether DUOX1-mediated DNA damage contributes to thyroid carcinogenesis in vivo not tested","Direct H₂O₂ target causing DSBs not identified"]},{"year":2016,"claim":"Pinpointing EGFR Cys-797 as the redox-sensitive activating residue and distinguishing sulfenylation (activating) from S-glutathionylation provided the precise molecular mechanism of DUOX1-mediated EGFR activation.","evidence":"In vitro kinase assays with recombinant Src/EGFR, C797S mutagenesis, dimedone-based sulfenylation trapping, DUOX1 siRNA in airway cells","pmids":["27650496"],"confidence":"High","gaps":["Whether sequential sulfenylation-to-S-glutathionylation serves as a regulatory switch in vivo unknown","Structural basis of Cys-797 accessibility not resolved"]},{"year":2016,"claim":"In vivo allergen models showed that DUOX1-dependent EGFR cysteine oxidation drives airway remodeling including mucous metaplasia and fibrosis, and that DUOX1 silencing could reverse established disease, establishing DUOX1 as a therapeutic target in allergic airway disease.","evidence":"DUOX1-deficient mice, intratracheal siRNA delivery, HDM allergen model with histological and molecular readouts","pmids":["27812543"],"confidence":"High","gaps":["Specific epithelial vs. immune cell contribution not dissected","Long-term safety of DUOX1 inhibition in innate defense not evaluated"]},{"year":2016,"claim":"Finding that DUOX1 silencing induces EMT, loss of E-cadherin, and resistance to EGFR inhibitors in lung cancer cells suggested DUOX1 maintains epithelial differentiation, with its loss promoting a mesenchymal/stem-like phenotype.","evidence":"Stable RNAi knockdown and overexpression in lung epithelial/cancer cell lines, EMT marker analysis, migration/invasion assays","pmids":["27694834"],"confidence":"Medium","gaps":["Mechanism linking DUOX1 loss to E-cadherin downregulation not defined","In vivo tumor models with DUOX1 genetic manipulation lacking","Causal relationship vs. correlation with EGFR inhibitor resistance not fully resolved"]},{"year":2017,"claim":"Showing that ATG5 controls DUOX1 apical membrane trafficking without affecting total protein levels revealed an autophagy-dependent mechanism for DUOX1 localization and functional activation.","evidence":"siRNA knockdown of ATG5 and DUOX1 in primary human airway epithelial cells, EPR spectroscopy, confocal localization, OVA mouse model","pmids":["28982074"],"confidence":"Medium","gaps":["Direct interaction between ATG5/autophagy machinery and DUOX1 not demonstrated","Whether this is canonical or non-canonical autophagy unclear"]},{"year":2018,"claim":"Demonstrating that Duox1⁻/⁻ B cells show enhanced proliferation upon BCR stimulation established DUOX1-derived H₂O₂ as a negative regulator of B cell expansion, revealing a cell-extrinsic antiproliferative role.","evidence":"Duox1 KO mice, CD19+ B cell isolation, BCR+IL-4 stimulation, proliferation and Ig isotype assays, extracellular catalase phenocopy","pmids":["30559322"],"confidence":"High","gaps":["Molecular target of H₂O₂ in B cell proliferation control not identified","Whether effect is autocrine or paracrine not fully resolved"]},{"year":2019,"claim":"Characterizing the DUOX1 R1307Q and DUOXA1 R56W disease-associated mutations as reducing H₂O₂ output confirmed that both subunits are functionally required and that mutations in either can impair DUOX1 activity.","evidence":"Functional H₂O₂ assays with transfected mutant constructs, protein expression analysis","pmids":["31428054"],"confidence":"Medium","gaps":["Clinical significance of these variants not established with patient phenotyping","Structural basis of R1307Q impairment unknown"]},{"year":2020,"claim":"Cryo-EM structures of the DUOX1-DUOXA1 complex revealed the lipid-mediated NADPH-binding pocket, electron transfer path, and an inactive dimer-of-dimers state, providing the first atomic-level understanding of DUOX1 catalysis and oligomeric regulation.","evidence":"Cryo-EM of mouse DUOX1-DUOXA1 in apo and NADPH-bound states with biochemical validation","pmids":["32929281"],"confidence":"High","gaps":["Active monomeric complex structure not captured","Calcium-bound EF-hand conformation and activation transition not resolved structurally"]},{"year":2021,"claim":"Discovering that DUOX1-derived H₂O₂ stabilizes phospho-Smad3 by blocking its NEDD4L-mediated ubiquitination provided a mechanistic link between DUOX1 and profibrotic TGF-β signaling amplification.","evidence":"DUOX1-deficient mice, Smad3 phosphorylation and ubiquitination assays, Co-IP of phospho-Smad3 with NEDD4L in primary lung fibroblasts","pmids":["32764116"],"confidence":"High","gaps":["Whether DUOX1 directly oxidizes NEDD4L or phospho-Smad3 to block interaction not determined","Relevance to non-pulmonary fibrosis settings untested"]},{"year":2021,"claim":"Identifying DUOX1 as an NAADP synthase that converts NAADPH to NAADP revealed a previously unrecognized enzymatic activity and connected DUOX1 to global Ca²⁺ signaling during T cell activation.","evidence":"In vitro NAADP formation assay, conditional Duoxa1/Duoxa2 and individual Duox KO mouse T cells, Ca²⁺ microdomain and global imaging","pmids":["34784249"],"confidence":"High","gaps":["Whether NAADP synthesis is physiologically significant relative to H₂O₂ production unknown","Structural basis of NAADPH recognition not defined"]},{"year":2022,"claim":"Conditional myeloid-specific DUOX1 deletion demonstrated a macrophage-intrinsic role in driving type 2 allergic inflammation, separating DUOX1's immune cell function from its epithelial role.","evidence":"LysM-Cre conditional KO mice, HDM allergen model, type 2 cytokine and macrophage recruitment quantification","pmids":["35654836"],"confidence":"High","gaps":["Molecular mechanism of DUOX1 action in macrophage polarization not defined","Whether DUOX1 acts through H₂O₂ or NAADP in macrophages not tested"]},{"year":2024,"claim":"Demonstrating that DUOXA1 N-glycosylation controls DUOX1 apical vs. basolateral sorting resolved how the maturation factor directs DUOX1 to the correct membrane domain.","evidence":"Co-expression in polarized MDCK cells, N-glycosylation mutants of DUOXA1, domain-swap experiments, immunofluorescence","pmids":["39126279"],"confidence":"High","gaps":["Glycan structures required for apical sorting not characterized","Whether glycosylation-dependent sorting operates identically in all epithelial tissues not tested"]},{"year":2026,"claim":"Myeloid-specific DUOX1 ablation attenuated pulmonary fibrosis through loss of Src cysteine oxidation in macrophages, establishing a DUOX1→Src oxidation→profibrotic activation axis that drives macrophage-fibroblast cross-talk.","evidence":"LysM-Cre conditional KO, BMDM migration and profibrotic assays, Src cysteine oxidation biotin-labeling, Src inhibitor rescue, collagen quantification","pmids":["40986746"],"confidence":"High","gaps":["Specific Src cysteine residue(s) oxidized by DUOX1 in macrophages not mapped","Whether EGFR ligand shedding by macrophages is the dominant paracrine mechanism not confirmed"]},{"year":null,"claim":"Key unresolved questions include the structural basis of calcium-induced DUOX1 activation (transition from inactive dimer-of-dimers to active state), the physiological importance of NAADP synthesis relative to H₂O₂ production, and the identity of specific oxidized cysteine residues in Src and NEDD4L that mediate DUOX1 signaling.","evidence":"","pmids":[],"confidence":"High","gaps":["Active-state structure of DUOX1-DUOXA1 not resolved","Relative contributions of NAADP vs. H₂O₂ enzymatic activities to downstream biology unknown","Precise cysteine targets on Src, ADAM17, and NEDD4L mediating DUOX1 signaling not mapped"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016491","term_label":"oxidoreductase activity","supporting_discovery_ids":[0,1,4,12]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[3,5,6]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,13,16,18]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[2,3,5,7,8,9]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[2,10,20,22]}],"complexes":["DUOX1-DUOXA1"],"partners":["DUOXA1","SRC","EGFR","ADAM17","SHP2","ITPR1","NEDD4L","ATG5"],"other_free_text":[]},"mechanistic_narrative":"DUOX1 is a calcium-dependent NADPH oxidase that generates H₂O₂ at epithelial surfaces and in immune cells, coupling receptor-mediated calcium signals to redox-dependent signaling cascades that regulate innate defense, tissue remodeling, and lymphocyte activation. Functional DUOX1 requires co-assembly with its maturation factor DUOXA1, whose N-glycosylation directs apical membrane sorting; the complex forms a dimer-of-dimers architecture with a lipid-mediated NADPH-binding pocket and defined electron transfer path, and its activity is positively regulated by EF-hand calcium binding and PKA phosphorylation at Ser955 [PMID:19144650, PMID:32929281, PMID:39126279]. DUOX1-derived H₂O₂ activates downstream signaling through cysteine oxidation of specific targets—sulfenylation of Src and EGFR Cys-797 drives EGFR transactivation and ADAM17-mediated ligand shedding, oxidative inactivation of SHP-2 amplifies TCR/ZAP-70 signaling, and inhibition of NEDD4L–phospho-Smad3 interaction sustains TGF-β/Smad3 signaling [PMID:27650496, PMID:20682913, PMID:23349873, PMID:32764116]. Beyond epithelial defense, DUOX1 synthesizes NAADP to support global Ca²⁺ signaling during T cell activation, negatively regulates B cell proliferation, and drives profibrotic macrophage activation through Src oxidation in pulmonary fibrosis [PMID:34784249, PMID:30559322, PMID:40986746]."},"prefetch_data":{"uniprot":{"accession":"Q9NRD9","full_name":"Dual oxidase 1","aliases":["Large NOX 1","Long NOX 1","NADPH thyroid oxidase 1","Thyroid oxidase 1"],"length_aa":1551,"mass_kda":177.2,"function":"Generates hydrogen peroxide (H2O2) which is required for the activity of thyroid peroxidase/TPO and lactoperoxidase/LPO (PubMed:10806195, PubMed:15972824). Plays a role in thyroid hormone synthesis (PubMed:10806195). Also required for lactoperoxidase-mediated antimicrobial defense at the surface of mucosa (PubMed:12824283). Antimicrobial agent hypothiocyanite (OSCN-), which is produced by LPO from DUOX1-derived H2O2, promotes influenza virus inactivation by reducing viral binding to and entry into host cells (PubMed:34168077). Promotes antiviral immunity by increasing airway cytokine levels, promoting innate immune cell recruitment and reducing airway epithelial cell apoptosis (By similarity). In response to bacterial stimuli, activated by ATP and promotes EGFR/ERK signaling, ADAM17 activation, and EGFR ligand shedding, leading to enhanced CXCL8/IL8 expression and secretion in airway epithelia (PubMed:19386603). Synthesizes NAADP from its reduced NAADPH form which promotes Ca(2+) signaling during T cell activation (PubMed:34784249). In addition to its oxidase activity, has also been shown to have peroxidase activity through its N-terminal peroxidase-like domain (PubMed:11514595). However, another study showed that the isolated peroxidase-like domain does not bind heme and has no intrinsic peroxidase activity (PubMed:19460756)","subcellular_location":"Apical cell membrane","url":"https://www.uniprot.org/uniprotkb/Q9NRD9/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/DUOX1","classification":"Not Classified","n_dependent_lines":3,"n_total_lines":1208,"dependency_fraction":0.0024834437086092716},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/DUOX1","total_profiled":1310},"omim":[{"mim_id":"617792","title":"THIOREDOXIN DOMAIN-CONTAINING PROTEIN 11; TXNDC11","url":"https://www.omim.org/entry/617792"},{"mim_id":"615904","title":"PEROXIDASIN-LIKE PROTEIN; PXDNL","url":"https://www.omim.org/entry/615904"},{"mim_id":"614647","title":"COENZYME Q6, MONOOXYGENASE; COQ6","url":"https://www.omim.org/entry/614647"},{"mim_id":"612772","title":"DUAL OXIDASE MATURATION FACTOR 2; DUOXA2","url":"https://www.omim.org/entry/612772"},{"mim_id":"612771","title":"DUAL OXIDASE MATURATION FACTOR 1; DUOXA1","url":"https://www.omim.org/entry/612771"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"epididymis","ntpm":77.7},{"tissue":"esophagus","ntpm":69.8},{"tissue":"skin 1","ntpm":98.9}],"url":"https://www.proteinatlas.org/search/DUOX1"},"hgnc":{"alias_symbol":["NOXEF1","THOX1","LNOX1"],"prev_symbol":[]},"alphafold":{"accession":"Q9NRD9","domains":[{"cath_id":"1.10.640.10","chopping":"50-552","consensus_level":"high","plddt":96.0494,"start":50,"end":552},{"cath_id":"2.30.29.30","chopping":"642-756","consensus_level":"medium","plddt":82.9999,"start":642,"end":756},{"cath_id":"1.10.238","chopping":"763-850","consensus_level":"medium","plddt":73.9436,"start":763,"end":850},{"cath_id":"1.10.238.10","chopping":"852-926","consensus_level":"medium","plddt":70.8285,"start":852,"end":926},{"cath_id":"2.40.30.10","chopping":"1271-1374","consensus_level":"medium","plddt":86.4005,"start":1271,"end":1374},{"cath_id":"3.40.50.80","chopping":"1376-1551","consensus_level":"medium","plddt":88.2422,"start":1376,"end":1551},{"cath_id":"1.20.120","chopping":"1044-1268","consensus_level":"high","plddt":94.9059,"start":1044,"end":1268}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9NRD9","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9NRD9-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9NRD9-F1-predicted_aligned_error_v6.png","plddt_mean":85.62},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=DUOX1","jax_strain_url":"https://www.jax.org/strain/search?query=DUOX1"},"sequence":{"accession":"Q9NRD9","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9NRD9.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9NRD9/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9NRD9"}},"corpus_meta":[{"pmid":"16111680","id":"PMC_16111680","title":"Differential 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Co-expression with maturation factor DUOXA1 is required for membrane expression and enzymatic activity.\",\n      \"method\": \"Functional H2O2 assay with co-expression of DUOX1/DUOXA1, site-directed mutagenesis of EF-hand motifs, forskolin stimulation, phosphorylation mapping, confirmed in human thyroid cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro functional assay with mutagenesis and pharmacological dissection, replicated in primary thyroid cells\",\n      \"pmids\": [\"19144650\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Cryo-EM structures of mouse DUOX1-DUOXA1 complex reveal atomic details of DUOX1-DUOXA1 interaction, a lipid-mediated NADPH-binding pocket, and the electron transfer path. A dimer-of-dimers configuration represents an inactive state, indicating an oligomerization-dependent regulatory mechanism.\",\n      \"method\": \"Cryo-EM structure determination in absence and presence of NADPH substrate, biochemical analysis of oligomeric states\",\n      \"journal\": \"Nature structural & molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — cryo-EM structures with biochemical validation, multiple conformational states resolved\",\n      \"pmids\": [\"32929281\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"DUOX1 binds to inositol 1,4,5-trisphosphate receptor 1 (IP3R1) in CD4+ T cells and is required for early TCR-stimulated H2O2 production. DUOX1-derived H2O2 inactivates SHP-2 phosphatase, promoting ZAP-70 phosphorylation at Tyr-319 and its association with Lck and CD3ζ, thereby creating a positive feedback loop in TCR signaling.\",\n      \"method\": \"Co-immunoprecipitation of DUOX1 with IP3R1, siRNA knockdown, stable shRNA knockdown, measurement of H2O2 production, TCR signaling readouts (ZAP-70 phosphorylation, Ca2+ entry, ERK activation, cytokine production)\",\n      \"journal\": \"Science signaling\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP, KD with defined signaling phenotype, multiple orthogonal readouts\",\n      \"pmids\": [\"20682913\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"ATP-mediated DUOX1 activation involves P2Y2 receptor stimulation, which recruits Src and DUOX1 into a signaling complex. DUOX1-derived H2O2 oxidizes cysteine residues within Src and ADAM17, activating the sheddase to release EGFR ligands, leading to EGFR transactivation, ERK/NF-κB activation, and IL-8 production.\",\n      \"method\": \"siRNA and shRNA silencing of DUOX1, thiol-specific biotin labeling to detect cysteine oxidation of Src and ADAM17, P2Y2R antagonists, Co-IP of Src and DUOX1, EGFR transactivation assays\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods including thiol-labeling, Co-IP, and genetic KD with defined signaling phenotype\",\n      \"pmids\": [\"23349873\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"The human DUOX1 N-terminal peroxidase-like domain (residues 1–593) does not bind heme and has no intrinsic peroxidase activity when expressed in isolation, unlike its C. elegans ortholog which covalently binds heme and has modest peroxidase activity.\",\n      \"method\": \"Baculovirus expression and purification of isolated peroxidase domains from human and C. elegans DUOX1, heme-binding assays, peroxidase activity assays, superoxide dismutase activity assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — purified recombinant domain with in vitro enzymatic assays and direct biochemical characterization\",\n      \"pmids\": [\"19460756\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"ATP-dependent EGFR transactivation involves sequential sulfenylation then S-glutathionylation of Cys residues in EGFR and Src via DUOX1-derived H2O2. Sulfenylation (not S-glutathionylation) is the activating modification; the C797S EGFR variant abolishes H2O2-induced kinase activity enhancement, confirming Cys-797 as the redox-sensitive regulatory residue.\",\n      \"method\": \"In vitro kinase assay with recombinant Src and EGFR treated with H2O2 or GSSG, C797S EGFR mutagenesis, dimedone-based sulfenylation trapping, siRNA/shRNA DUOX1 silencing in airway cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution with mutagenesis plus cellular validation with KD\",\n      \"pmids\": [\"27650496\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"DUOX1 is critical for ATP-stimulated transient H2O2 production and protein S-glutathionylation in airway epithelial cells. Identified S-glutathionylated targets include β-actin, peroxiredoxin 1, Src, and MAPK phosphatase 1, linking DUOX1 to cytoskeletal dynamics and MAPK signaling in cell migration.\",\n      \"method\": \"Biotin-tagged GSH cell labeling, avidin purification, global proteomics, DUOX1 shRNA in H292 cells and primary tracheal epithelial cells from DUOX1-deficient mice\",\n      \"journal\": \"Redox biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — global proteomics with genetic KO confirmation and multiple orthogonal methods\",\n      \"pmids\": [\"24624333\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"ATP-mediated DUOX1 activation in airway epithelial cells leads to intracellular H2O2-dependent EGFR/ERK activation and ADAM17-mediated EGFR ligand shedding, resulting in IL-8 production in response to bacterial stimuli.\",\n      \"method\": \"Catalase (extracellular and intracellular), EGFR/ERK inhibitors, siRNA knockdown of DUOX1, measurement of ATP release, ADAM17 activation, and IL-8 release upon bacterial stimuli\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KD with pharmacological dissection and defined pathway position\",\n      \"pmids\": [\"19386603\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"DUOX1 mediates allergen-induced persistent EGFR activation through cysteine oxidation within EGFR and Src, driving amphiregulin production, mucous metaplasia, subepithelial fibrosis, and airway remodeling. Targeted siRNA or pharmacological inhibition of DUOX1 reversed established allergic inflammation.\",\n      \"method\": \"DUOX1-deficient mice, DUOX1-targeted siRNA intratracheal delivery, pharmacological NADPH oxidase inhibitors, HDM allergen mouse model, measurement of EGFR cysteine oxidation\",\n      \"journal\": \"JCI insight\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO and siRNA KD in vivo with multiple defined phenotypic readouts and mechanism\",\n      \"pmids\": [\"27812543\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"DUOX1-derived H2O2 promotes TGF-β1/Smad3 signaling by preventing phospho-Smad3 degradation. Mechanistically, DUOX1 inhibits the interaction between phospho-Smad3 and the ubiquitin ligase NEDD4L, preventing NEDD4L-mediated ubiquitination and proteasomal targeting of phospho-Smad3.\",\n      \"method\": \"Primary human and mouse lung fibroblasts, DUOX1-deficient mice (DUOX1+/-, DUOX1-/-), TGF-β1 stimulation, Smad3 phosphorylation/ubiquitination assays, Co-IP of phospho-Smad3 with NEDD4L\",\n      \"journal\": \"The European respiratory journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO model, Co-IP, ubiquitination assay, mechanistic pathway identification in primary cells\",\n      \"pmids\": [\"32764116\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"DUOX1 and DUOX2 synthesize NAADP from NAADPH in vitro, functioning as NAADP-forming enzymes. In T cells, DUOX1 and DUOX2 (but not NOX1 or NOX2) are required for global Ca2+ signaling 4–12 min after TCR activation, while DUOX2 specifically controls early Ca2+ microdomains in the first 15 s.\",\n      \"method\": \"In vitro enzymatic assay of NAADP formation, mouse T cells with conditional knockout of Duoxa1/Duoxa2, Duox1 KO, Duox2 KO, and Nox1/Nox2 KO; Ca2+ imaging (local microdomains and global)\",\n      \"journal\": \"Science signaling\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1+2 — in vitro reconstitution of enzymatic activity plus genetic KO with direct Ca2+ measurement\",\n      \"pmids\": [\"34784249\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"DUOX1 is the NADPH oxidase responsible for calcium-stimulated H2O2 production in urothelial cells. TRPV4 calcium channel activation triggers calcium signals that stimulate DUOX1-dependent H2O2 production, and Duox1 knockout mice show altered pressure responses in the urinary bladder.\",\n      \"method\": \"DUOX1 gene-deficient mouse model, selective TRPV4 agonists, H2O2 measurement in urothelial cells, bladder pressure response assays\",\n      \"journal\": \"Free radical biology & medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO with defined cellular and organ-level phenotype, pharmacological calcium channel activation\",\n      \"pmids\": [\"21146788\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Duox1 is the main source of H2O2 in the rat thyroid cell line PCCl3. siRNA-mediated silencing of Duox1 reduces H2O2 production, and re-expression of rat Duox1 (but only partial rescue with human DUOX1) restores enzymatic activity.\",\n      \"method\": \"siRNA knockdown of Duox1 in PCCl3 cells, H2O2 production assays, lentiviral re-expression rescue experiments, Western blotting for glycosylated protein\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KD with rescue experiment and defined enzymatic phenotype\",\n      \"pmids\": [\"17643428\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"DUOX1 apical sorting in polarized epithelial cells depends on its maturation factor DUOXA1. N-glycosylation of DUOXA1 is required for correct apical targeting of DUOX1; glycosylation-defective DUOXA1 causes DUOX1 mistargeting to the basolateral membrane.\",\n      \"method\": \"Co-expression in MDCK polarized epithelial cells, N-glycosylation mutants of DUOXA1, immunofluorescence localization, domain-swap experiments between DUOXA1 and DUOXA2\",\n      \"journal\": \"Genes to cells\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct localization experiment with mutagenesis and functional consequence (mistargeting)\",\n      \"pmids\": [\"39126279\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"DUOX1-derived H2O2 promotes Cxcl8 expression and late-phase neutrophil recruitment via a JNK/c-JUN/AP-1 signaling pathway and histone modifications (H3K4me3, H3K9ac, H3K9me3) at the cxcl8 promoter, but not via ERK or NF-κB.\",\n      \"method\": \"Zebrafish in vivo model (ortholog), Duox1 morpholino knockdown, H2O2 exposure, pharmacological inhibitors of JNK/ERK/NF-κB, chromatin immunoprecipitation (ChIP) for histone modifications at cxcl8 promoter\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — zebrafish ortholog, ChIP for epigenetic mechanism, genetic KD with pharmacological pathway dissection\",\n      \"pmids\": [\"25582859\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Ionizing radiation activates p38 MAPK, which increases IL-13 expression, leading to upregulation of DUOX1 and sustained DUOX1-dependent H2O2 production for days after irradiation. This persistent H2O2 production causes DNA double-strand breaks and growth arrest; catalase pretreatment or DUOX1 siRNA knockdown abrogates IR-induced DNA damage.\",\n      \"method\": \"Human thyroid cell line and primary thyrocytes, siRNA knockdown of DUOX1, catalase treatment, p38 MAPK inhibitors, measurement of H2O2, DNA damage markers (γH2AX), dose-dependent irradiation\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KD with mechanistic pathway placement (p38/IL-13/DUOX1), multiple methods, confirmed in primary cells\",\n      \"pmids\": [\"25848056\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"DUOX1 expression and its maturation factor DUOXA1 are developmentally regulated in human fetal lung alveolar type II cells, with strong induction by DCI (dexamethasone/cAMP/IBMX) hormone mixture. DUOX1 localizes to the apical cell pole and mediates H2O2 and acid production in differentiated type II cells.\",\n      \"method\": \"siRNA knockdown of DUOX1 in human fetal lung cells, DCI differentiation, apical localization by immunofluorescence, H2O2 production assays, DPI inhibitor, transepithelial electrical measurements\",\n      \"journal\": \"American journal of physiology. Lung cellular and molecular physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — siRNA KD with defined functional phenotype and localization, single lab\",\n      \"pmids\": [\"17337509\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Testosterone activates DUOX1 in skin keratinocytes via GPRC6A receptor, which couples to Gq protein to generate IP3 and intracellular Ca2+ mobilization, leading to DUOX1-dependent H2O2 production and caspase-3-mediated apoptosis.\",\n      \"method\": \"GPRC6A siRNA silencing, Ca2+ imaging, H2O2 measurement, caspase-3 activation assay, 3D skin equivalent model\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic silencing with defined pathway (GPRC6A-Gq-IP3-Ca2+-DUOX1-H2O2-apoptosis), single lab\",\n      \"pmids\": [\"25164816\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Autophagy proteins, specifically ATG5, regulate DUOX1 localization to the apical membrane in airway epithelial cells during chronic IL-13 stimulation. ATG5 depletion reduces DUOX1-dependent intracellular superoxide production without affecting total DUOX1 protein levels, indicating autophagy controls DUOX1 trafficking rather than expression.\",\n      \"method\": \"siRNA knockdown of DUOX1 and ATG5 in primary human tracheobronchial epithelial cells, OVA mouse model, EPR spectroscopy for superoxide, LC3BII autophagosome marker, confocal immunostaining of DUOX1 localization\",\n      \"journal\": \"Redox biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic KD with direct localization readout and defined mechanism linking autophagy to DUOX1 apical trafficking, single lab\",\n      \"pmids\": [\"28982074\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"DUOX1 silencing in lung epithelial cells causes loss of E-cadherin, epithelial-to-mesenchymal transition (EMT) features, increased vimentin/collagen, and resistance to EGFR tyrosine kinase inhibitors. Conversely, DUOX1 overexpression in A549 cells reverses EMT. DUOX1 silencing also increases cancer stem cell markers CD133 and ALDH1.\",\n      \"method\": \"RNAi-mediated stable DUOX1 knockdown and overexpression, morphology assessment, barrier function, E-cadherin/vimentin protein measurement, migration and anchorage-independent growth assays, in vivo invasion model\",\n      \"journal\": \"Oncogenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KD/OE with multiple phenotypic readouts, single lab but multiple orthogonal assays\",\n      \"pmids\": [\"27694834\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Duox1-derived H2O2 negatively regulates proliferative activity of primary splenic B cells. BCR stimulation with IL-4 upregulates Duox1 expression and H2O2 production; Duox1-/- B cells show enhanced proliferation without change in Ig isotype production. Extracellular catalase mimics the Duox1-/- proliferative phenotype.\",\n      \"method\": \"Duox1-/- mice, CD19+ B cell isolation, BCR stimulation + IL-4, H2O2 measurement, proliferation assay, in vivo immunization with T cell-dependent and -independent antigens, catalase treatment\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO mouse confirmed in vitro and in vivo with multiple assays, catalase rescue experiment\",\n      \"pmids\": [\"30559322\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"DUOX1 and Duox1/2 mediate PDGF-induced intracellular H2O2 production and PKB/Akt phosphorylation in fibroblasts and mesenchymal stromal cells, driving cell migration. Silencing Duox1/2 reduces PDGF-stimulated H2O2, Akt phosphorylation, and migration without affecting ERK1/2.\",\n      \"method\": \"Real-time PCR for NOX isoforms, siRNA silencing of Duox1/2 or Nox4, live H2O2 imaging, migration assays, Western blotting for Akt and ERK phosphorylation\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic KD with defined signaling pathway, single lab\",\n      \"pmids\": [\"27110716\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Macrophage-intrinsic DUOX1 contributes to type 2 inflammation, mucus metaplasia, and macrophage recruitment during chronic allergen-driven inflammation. Conditional DUOX1 deletion in monocyte/macrophage lineage impaired type 2 cytokine production and macrophage activation in chronic HDM-driven allergic airway inflammation.\",\n      \"method\": \"Conditional cell-type-specific DUOX1 knockout (monocyte/macrophage lineage using Cre-lox), HDM allergen mouse model, type 2 cytokine measurement, mucus staining, macrophage recruitment assays\",\n      \"journal\": \"Mucosal immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional cell-type-specific KO with defined phenotypic readouts, cell-intrinsic mechanism demonstrated\",\n      \"pmids\": [\"35654836\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"Macrophage-intrinsic DUOX1 mediates profibrotic macrophage activation through oxidative activation of Src kinase via cysteine oxidation, promoting MoMac recruitment, collagen production, and EGFR ligand production for macrophage-fibroblast cross-talk. Conditional myeloid-specific DUOX1 ablation dramatically attenuated pulmonary fibrosis.\",\n      \"method\": \"LysM-Cre conditional DUOX1 KO, BMDM in vitro migration and profibrotic activation assays, Src cysteine oxidation by biotin-labeling, saracatinib (Src inhibitor) treatment, collagen quantification, oxygen saturation measurement\",\n      \"journal\": \"American journal of respiratory cell and molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional genetic KO with mechanistic biochemical validation (Src oxidation) and pharmacological inhibition, multiple orthogonal methods\",\n      \"pmids\": [\"40986746\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"DUOX1-mediated H2O2 production regulates sodium transport in H441 bronchiolar epithelial cells. Tonic DUOX1-derived H2O2 activates amiloride-sensitive ENaC currents in dome-forming cells, while H2O2 feeds back negatively on ENaC gene expression.\",\n      \"method\": \"siRNA/DUOX1 knockdown, exogenous catalase, H2O2 dose-response, nystatin-perforated whole-cell patch-clamp for ENaC currents, RT-PCR, immunocytochemistry\",\n      \"journal\": \"Acta physiologica\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — electrophysiology with defined H2O2 mechanism, but single lab\",\n      \"pmids\": [\"30052308\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"HIF-2α promotes DUOX1 transcription in response to arsenic exposure; DUOX1-derived ROS suppresses GPX4 expression, promoting ferroptosis and kidney injury. Dual luciferase assay confirmed HIF-2α directly drives DUOX1 promoter activity.\",\n      \"method\": \"siRNA knockdown of DUOX1 in HK-2 cells, dual luciferase reporter assay, in vivo mouse model, GPX4 western blotting, ROS/iron quantification\",\n      \"journal\": \"The Science of the total environment\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — luciferase reporter for transcriptional mechanism, genetic KD with defined phenotype, single lab\",\n      \"pmids\": [\"37879473\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"DUOX1 R1307Q missense mutation and DUOXA1 R56W missense mutation each decrease DUOX1 protein expression and H2O2 generation, demonstrating that intact DUOXA1 is required for full DUOX1 H2O2-generating activity.\",\n      \"method\": \"Functional H2O2 generation assays with transfected mutant DUOX1/DUOXA1 constructs, RT-PCR and protein expression analysis\",\n      \"journal\": \"Frontiers in endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional assay of disease mutations demonstrating DUOXA1 requirement for DUOX1 activity, single lab\",\n      \"pmids\": [\"31428054\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"DUOX1 is a calcium-dependent NADPH oxidase that requires co-assembly with its maturation factor DUOXA1 (which controls apical membrane sorting via N-glycosylation) to form an active complex that produces H2O2 through a lipid-mediated NADPH-binding pocket and defined electron transfer path; its activity is positively regulated by PKA-mediated phosphorylation at Ser955 and by calcium/EF-hand motifs, and DUOX1-derived H2O2 mediates diverse downstream signaling through oxidation of cysteine residues in targets including Src (activating), EGFR (at Cys-797, activating), ADAM17, and SHP-2 (inactivating), thereby driving innate epithelial defense, EGFR transactivation, TGF-β/Smad3 amplification (by blocking NEDD4L-mediated phospho-Smad3 ubiquitination), T cell and B cell receptor signaling modulation, and NAADP synthesis for Ca2+ microdomain formation during lymphocyte activation.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"DUOX1 is a calcium-dependent NADPH oxidase that generates H₂O₂ at epithelial surfaces and in immune cells, coupling receptor-mediated calcium signals to redox-dependent signaling cascades that regulate innate defense, tissue remodeling, and lymphocyte activation. Functional DUOX1 requires co-assembly with its maturation factor DUOXA1, whose N-glycosylation directs apical membrane sorting; the complex forms a dimer-of-dimers architecture with a lipid-mediated NADPH-binding pocket and defined electron transfer path, and its activity is positively regulated by EF-hand calcium binding and PKA phosphorylation at Ser955 [PMID:19144650, PMID:32929281, PMID:39126279]. DUOX1-derived H₂O₂ activates downstream signaling through cysteine oxidation of specific targets—sulfenylation of Src and EGFR Cys-797 drives EGFR transactivation and ADAM17-mediated ligand shedding, oxidative inactivation of SHP-2 amplifies TCR/ZAP-70 signaling, and inhibition of NEDD4L–phospho-Smad3 interaction sustains TGF-β/Smad3 signaling [PMID:27650496, PMID:20682913, PMID:23349873, PMID:32764116]. Beyond epithelial defense, DUOX1 synthesizes NAADP to support global Ca²⁺ signaling during T cell activation, negatively regulates B cell proliferation, and drives profibrotic macrophage activation through Src oxidation in pulmonary fibrosis [PMID:34784249, PMID:30559322, PMID:40986746].\",\n  \"teleology\": [\n    {\n      \"year\": 2007,\n      \"claim\": \"Establishing that DUOX1 is the dominant H₂O₂ source in thyroid cells resolved which NOX family member fulfills this function, while parallel work showed DUOX1 is developmentally regulated and apically localized in lung epithelial cells.\",\n      \"evidence\": \"siRNA knockdown with re-expression rescue in PCCl3 thyroid cells; siRNA KD in differentiating fetal lung alveolar type II cells with immunofluorescence localization\",\n      \"pmids\": [\"17643428\", \"17337509\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of DUOX1 activation and co-factor requirements not yet defined\", \"Species-specific differences in rescue efficiency unexplained\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Defining the regulatory logic of DUOX1 activation—calcium/EF-hand dependence, PKA/Ser955 phosphorylation, and obligate DUOXA1 co-expression—established the enzymatic control architecture and resolved how DUOX1 differs from DUOX2 (PKC-regulated).\",\n      \"evidence\": \"Site-directed mutagenesis of EF-hand motifs, phosphorylation mapping, forskolin stimulation, co-expression with DUOXA1 in reconstituted systems and primary thyroid cells\",\n      \"pmids\": [\"19144650\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of DUOXA1 requirement unknown\", \"Downstream signaling targets of DUOX1-derived H₂O₂ not identified\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Demonstrating that the human DUOX1 peroxidase-like domain lacks heme binding and peroxidase activity established that DUOX1 is an H₂O₂ generator rather than a peroxidase, distinguishing it from invertebrate orthologs.\",\n      \"evidence\": \"Purified recombinant peroxidase domains from human and C. elegans, heme-binding and enzymatic assays\",\n      \"pmids\": [\"19460756\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis for loss of heme binding not resolved\", \"Whether the peroxidase-like domain has non-enzymatic regulatory functions unknown\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Linking DUOX1 to EGFR transactivation via ADAM17-mediated ligand shedding and IL-8 production placed DUOX1 upstream of a major epithelial innate defense signaling axis.\",\n      \"evidence\": \"siRNA knockdown in airway epithelial cells, catalase compartmentalization, EGFR/ERK inhibitors, ADAM17 activation assays upon bacterial stimulation\",\n      \"pmids\": [\"19386603\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct molecular targets of DUOX1-derived H₂O₂ in EGFR transactivation not identified\", \"Cysteine residue specificity unknown\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Discovering that DUOX1 binds IP3R1 and that its H₂O₂ inactivates SHP-2 to amplify ZAP-70 phosphorylation revealed DUOX1 as a redox-dependent positive feedback regulator of TCR signaling.\",\n      \"evidence\": \"Co-immunoprecipitation of DUOX1–IP3R1, siRNA/shRNA knockdown in CD4+ T cells with TCR signaling readouts\",\n      \"pmids\": [\"20682913\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether SHP-2 oxidation is direct or indirect not fully resolved\", \"Stoichiometry and dynamics of DUOX1-IP3R1 interaction unknown\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Showing that Duox1 knockout mice have altered bladder pressure responses and that TRPV4-triggered Ca²⁺ activates DUOX1-dependent H₂O₂ in urothelium extended DUOX1 function beyond thyroid and airway to mechanosensory epithelial biology.\",\n      \"evidence\": \"Duox1 gene-deficient mice, TRPV4 agonists, H₂O₂ measurement in urothelial cells, bladder pressure assays\",\n      \"pmids\": [\"21146788\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream targets of DUOX1-derived H₂O₂ in urothelium unidentified\", \"Whether DUOX1 is required for normal bladder function or only stress responses unclear\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Identifying Src and ADAM17 as direct cysteine-oxidized targets of DUOX1-derived H₂O₂ provided the first molecular mechanism for how DUOX1 activates the EGFR transactivation pathway.\",\n      \"evidence\": \"Thiol-specific biotin labeling to detect cysteine oxidation in Src and ADAM17, Co-IP of Src–DUOX1, P2Y2R antagonists in airway epithelial cells\",\n      \"pmids\": [\"23349873\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific oxidized cysteine residues in Src and ADAM17 not mapped\", \"Whether oxidation is direct (DUOX1-proximal) or relay-mediated unknown\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Global proteomic identification of DUOX1-dependent S-glutathionylated targets (β-actin, Prx1, Src, MKP-1) broadened the scope of DUOX1 redox signaling beyond EGFR to cytoskeletal dynamics and MAPK regulation.\",\n      \"evidence\": \"Biotin-GSH labeling with avidin purification and proteomics in DUOX1-shRNA H292 cells and DUOX1-deficient mouse tracheal epithelial cells\",\n      \"pmids\": [\"24624333\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional validation of individual S-glutathionylation events incomplete\", \"Kinetics and reversibility of these modifications not characterized\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Demonstrating that ionizing radiation sustains DUOX1-dependent H₂O₂ via p38 MAPK/IL-13 upregulation, causing persistent DNA damage, revealed DUOX1 as an amplifier of radiation-induced genotoxicity in thyroid.\",\n      \"evidence\": \"siRNA knockdown and catalase treatment in thyroid cells, p38 inhibitors, γH2AX foci quantification after irradiation\",\n      \"pmids\": [\"25848056\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether DUOX1-mediated DNA damage contributes to thyroid carcinogenesis in vivo not tested\", \"Direct H₂O₂ target causing DSBs not identified\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Pinpointing EGFR Cys-797 as the redox-sensitive activating residue and distinguishing sulfenylation (activating) from S-glutathionylation provided the precise molecular mechanism of DUOX1-mediated EGFR activation.\",\n      \"evidence\": \"In vitro kinase assays with recombinant Src/EGFR, C797S mutagenesis, dimedone-based sulfenylation trapping, DUOX1 siRNA in airway cells\",\n      \"pmids\": [\"27650496\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether sequential sulfenylation-to-S-glutathionylation serves as a regulatory switch in vivo unknown\", \"Structural basis of Cys-797 accessibility not resolved\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"In vivo allergen models showed that DUOX1-dependent EGFR cysteine oxidation drives airway remodeling including mucous metaplasia and fibrosis, and that DUOX1 silencing could reverse established disease, establishing DUOX1 as a therapeutic target in allergic airway disease.\",\n      \"evidence\": \"DUOX1-deficient mice, intratracheal siRNA delivery, HDM allergen model with histological and molecular readouts\",\n      \"pmids\": [\"27812543\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific epithelial vs. immune cell contribution not dissected\", \"Long-term safety of DUOX1 inhibition in innate defense not evaluated\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Finding that DUOX1 silencing induces EMT, loss of E-cadherin, and resistance to EGFR inhibitors in lung cancer cells suggested DUOX1 maintains epithelial differentiation, with its loss promoting a mesenchymal/stem-like phenotype.\",\n      \"evidence\": \"Stable RNAi knockdown and overexpression in lung epithelial/cancer cell lines, EMT marker analysis, migration/invasion assays\",\n      \"pmids\": [\"27694834\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism linking DUOX1 loss to E-cadherin downregulation not defined\", \"In vivo tumor models with DUOX1 genetic manipulation lacking\", \"Causal relationship vs. correlation with EGFR inhibitor resistance not fully resolved\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Showing that ATG5 controls DUOX1 apical membrane trafficking without affecting total protein levels revealed an autophagy-dependent mechanism for DUOX1 localization and functional activation.\",\n      \"evidence\": \"siRNA knockdown of ATG5 and DUOX1 in primary human airway epithelial cells, EPR spectroscopy, confocal localization, OVA mouse model\",\n      \"pmids\": [\"28982074\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct interaction between ATG5/autophagy machinery and DUOX1 not demonstrated\", \"Whether this is canonical or non-canonical autophagy unclear\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Demonstrating that Duox1⁻/⁻ B cells show enhanced proliferation upon BCR stimulation established DUOX1-derived H₂O₂ as a negative regulator of B cell expansion, revealing a cell-extrinsic antiproliferative role.\",\n      \"evidence\": \"Duox1 KO mice, CD19+ B cell isolation, BCR+IL-4 stimulation, proliferation and Ig isotype assays, extracellular catalase phenocopy\",\n      \"pmids\": [\"30559322\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular target of H₂O₂ in B cell proliferation control not identified\", \"Whether effect is autocrine or paracrine not fully resolved\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Characterizing the DUOX1 R1307Q and DUOXA1 R56W disease-associated mutations as reducing H₂O₂ output confirmed that both subunits are functionally required and that mutations in either can impair DUOX1 activity.\",\n      \"evidence\": \"Functional H₂O₂ assays with transfected mutant constructs, protein expression analysis\",\n      \"pmids\": [\"31428054\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Clinical significance of these variants not established with patient phenotyping\", \"Structural basis of R1307Q impairment unknown\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Cryo-EM structures of the DUOX1-DUOXA1 complex revealed the lipid-mediated NADPH-binding pocket, electron transfer path, and an inactive dimer-of-dimers state, providing the first atomic-level understanding of DUOX1 catalysis and oligomeric regulation.\",\n      \"evidence\": \"Cryo-EM of mouse DUOX1-DUOXA1 in apo and NADPH-bound states with biochemical validation\",\n      \"pmids\": [\"32929281\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Active monomeric complex structure not captured\", \"Calcium-bound EF-hand conformation and activation transition not resolved structurally\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Discovering that DUOX1-derived H₂O₂ stabilizes phospho-Smad3 by blocking its NEDD4L-mediated ubiquitination provided a mechanistic link between DUOX1 and profibrotic TGF-β signaling amplification.\",\n      \"evidence\": \"DUOX1-deficient mice, Smad3 phosphorylation and ubiquitination assays, Co-IP of phospho-Smad3 with NEDD4L in primary lung fibroblasts\",\n      \"pmids\": [\"32764116\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether DUOX1 directly oxidizes NEDD4L or phospho-Smad3 to block interaction not determined\", \"Relevance to non-pulmonary fibrosis settings untested\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Identifying DUOX1 as an NAADP synthase that converts NAADPH to NAADP revealed a previously unrecognized enzymatic activity and connected DUOX1 to global Ca²⁺ signaling during T cell activation.\",\n      \"evidence\": \"In vitro NAADP formation assay, conditional Duoxa1/Duoxa2 and individual Duox KO mouse T cells, Ca²⁺ microdomain and global imaging\",\n      \"pmids\": [\"34784249\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether NAADP synthesis is physiologically significant relative to H₂O₂ production unknown\", \"Structural basis of NAADPH recognition not defined\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Conditional myeloid-specific DUOX1 deletion demonstrated a macrophage-intrinsic role in driving type 2 allergic inflammation, separating DUOX1's immune cell function from its epithelial role.\",\n      \"evidence\": \"LysM-Cre conditional KO mice, HDM allergen model, type 2 cytokine and macrophage recruitment quantification\",\n      \"pmids\": [\"35654836\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism of DUOX1 action in macrophage polarization not defined\", \"Whether DUOX1 acts through H₂O₂ or NAADP in macrophages not tested\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Demonstrating that DUOXA1 N-glycosylation controls DUOX1 apical vs. basolateral sorting resolved how the maturation factor directs DUOX1 to the correct membrane domain.\",\n      \"evidence\": \"Co-expression in polarized MDCK cells, N-glycosylation mutants of DUOXA1, domain-swap experiments, immunofluorescence\",\n      \"pmids\": [\"39126279\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Glycan structures required for apical sorting not characterized\", \"Whether glycosylation-dependent sorting operates identically in all epithelial tissues not tested\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Myeloid-specific DUOX1 ablation attenuated pulmonary fibrosis through loss of Src cysteine oxidation in macrophages, establishing a DUOX1→Src oxidation→profibrotic activation axis that drives macrophage-fibroblast cross-talk.\",\n      \"evidence\": \"LysM-Cre conditional KO, BMDM migration and profibrotic assays, Src cysteine oxidation biotin-labeling, Src inhibitor rescue, collagen quantification\",\n      \"pmids\": [\"40986746\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific Src cysteine residue(s) oxidized by DUOX1 in macrophages not mapped\", \"Whether EGFR ligand shedding by macrophages is the dominant paracrine mechanism not confirmed\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the structural basis of calcium-induced DUOX1 activation (transition from inactive dimer-of-dimers to active state), the physiological importance of NAADP synthesis relative to H₂O₂ production, and the identity of specific oxidized cysteine residues in Src and NEDD4L that mediate DUOX1 signaling.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Active-state structure of DUOX1-DUOXA1 not resolved\", \"Relative contributions of NAADP vs. H₂O₂ enzymatic activities to downstream biology unknown\", \"Precise cysteine targets on Src, ADAM17, and NEDD4L mediating DUOX1 signaling not mapped\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016491\", \"supporting_discovery_ids\": [0, 1, 4, 12]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [3, 5, 6]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 13, 16, 18]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [2, 3, 5, 7, 8, 9]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [2, 10, 20, 22]}\n    ],\n    \"complexes\": [\n      \"DUOX1-DUOXA1\"\n    ],\n    \"partners\": [\n      \"DUOXA1\",\n      \"SRC\",\n      \"EGFR\",\n      \"ADAM17\",\n      \"SHP2\",\n      \"ITPR1\",\n      \"NEDD4L\",\n      \"ATG5\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}