{"gene":"DUOXA2","run_date":"2026-06-09T23:54:42","timeline":{"discoveries":[{"year":2007,"finding":"DUOXA2 is required to reconstitute DUOX2 enzymatic activity; a truncated DUOXA2 mutant (p.Y246X) lacking transmembrane helix 5 and the C-terminal cytoplasmic domain is completely inactive in reconstituting DUOX2 H2O2-generating activity in vitro.","method":"In vitro reconstitution assay with mutant DUOXA2 protein in cell expression system","journal":"The Journal of clinical endocrinology and metabolism","confidence":"High","confidence_rationale":"Tier 1 / Moderate — direct in vitro reconstitution assay with defined loss-of-function mutant, single lab but clear functional readout","pmids":["18042646"],"is_preprint":false},{"year":2011,"finding":"DUOXA2 missense mutation C189R causes complete loss-of-function in reconstituting DUOX2 activity in vitro; heterodimerization of DUOX with specific maturation factors (DUOXA1 or DUOXA2) is essential for maturation and function of the DUOX enzyme complexes, and functional redundancy exists between DUOXA1 and DUOXA2.","method":"In vitro reconstitution assay; genetic mapping of deletion encompassing DUOX2, DUOXA1, DUOXA2","journal":"The Journal of clinical endocrinology and metabolism","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with defined mutant, supported by genetic analysis, single lab","pmids":["21367925"],"is_preprint":false},{"year":2015,"finding":"DUOXA2 forms an intermolecular disulfide-bonded complex with DUOX2 via interdisulfide bridges between the N-terminal domain of DUOX2 and the two extracellular loops of DUOXA2. This interaction depends on prior intramolecular disulfide bond formation (cys-124 to cys-1162) within DUOX2 in the ER, indicating DUOX2 acts as a chaperone-like partner for DUOXA2 folding. Stability and function of DUOXA2 are dependent on the oxidative folding of DUOX2.","method":"Cysteine mutagenesis, disulfide bond analysis, co-immunoprecipitation, functional activity assays","journal":"Antioxidants & redox signaling","confidence":"High","confidence_rationale":"Tier 1 / Moderate — mutagenesis combined with biochemical interaction assays and functional readout, single lab with multiple orthogonal methods","pmids":["25761904"],"is_preprint":false},{"year":2019,"finding":"DUOX2 and DUOXA2 form a stable enzymatic complex at the cell surface that produces extracellular H2O2. The Duox2/DuoxA2 complex is the most active H2O2-generating complex compared to Duox1/DuoxA1. Glycosylation-defective DUOXA2 drastically impairs DUOX2 maturation and activity, whereas unglycosylated DuoxA1 has limited impact on Duox1. H2O2 produced by the Duox2/DuoxA2 cell surface complex induces DNA damage in nuclei of expressing cells.","method":"Inducible HEK293 Tet-On3G cell lines expressing Duox/DuoxA combinations; Duolink proximity ligation assay for cell surface interaction; H2O2 measurement; DNA damage assays; glycosylation-defective mutants","journal":"Experimental cell research","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — multiple orthogonal methods including reconstitution, proximity ligation, mutagenesis, and functional assays in a single study","pmids":["31513783"],"is_preprint":false},{"year":2024,"finding":"DUOXA2 is required for apical plasma membrane sorting of DUOX2 in polarized epithelial cells. DUOX2 is missorted to the basolateral membrane when paired with DUOXA1 instead of DUOXA2. N-glycosylation of DUOXA2 is dispensable for DUOX2 apical recruitment (unlike DUOXA1 where N-glycosylation is required), but the C-terminal region of DUOXA2 appears to be involved in directing apical sorting.","method":"Co-expression in MDCK epithelial cells; confocal immunofluorescence microscopy for apical vs. basolateral localization; glycosylation-defective mutants","journal":"Genes to cells : devoted to molecular & cellular mechanisms","confidence":"High","confidence_rationale":"Tier 2 / Moderate — direct localization experiment with functional consequence, multiple mutant constructs and orthogonal lines of evidence, single lab","pmids":["39126279"],"is_preprint":false},{"year":2011,"finding":"IFN-γ induces co-upregulation of DUOX2 and its maturation factor DUOXA2 (but not other NOX family members) in human pancreatic cancer cells, associated with increased H2O2 production. This induction requires both the canonical JAK-STAT1 pathway and the p38-MAPK pathway, with STAT1 binding directly to elements of the DUOX2 promoter.","method":"Cytokine treatment, quantitative PCR, ROS/H2O2 measurement, pharmacological pathway inhibition, chromatin immunoprecipitation (STAT1 promoter binding)","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP for STAT1 binding, pharmacological inhibition, H2O2 measurement; mechanistic detail on regulatory pathway; single lab","pmids":["21321110"],"is_preprint":false},{"year":2012,"finding":"IL-4 and IL-13 (Th2 cytokines) specifically upregulate DUOX2 and DUOXA2 (but not DUOX1/DUOXA1) in human thyrocytes and intestinal Caco-2 cells, leading to increased calcium-stimulated extracellular H2O2 generation. This induction requires the JAK1-STAT6 cascade activated by the IL-4 type 2 receptor. IFN-γ inhibits this DUOX2/DUOXA2 induction.","method":"Cytokine treatment of primary thyrocytes and Caco-2 cells; quantitative RT-PCR; H2O2 measurement; pharmacological JAK-STAT pathway inhibition","journal":"Free radical biology & medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional H2O2 readout combined with pathway inhibition, isoform specificity demonstrated, single lab","pmids":["23010498"],"is_preprint":false},{"year":2017,"finding":"DUOXA2 nonsense mutation p.Tyr138* (homozygous) is a loss-of-function mutation, confirmed by expression experiments in HEK293 cells showing inability to reconstitute DUOX2 activity.","method":"HEK293 cell expression system with functional reconstitution assay","journal":"Endocrine journal","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — in vitro reconstitution assay, single lab, single method","pmids":["28626131"],"is_preprint":false},{"year":2025,"finding":"Ten DUOXA2 variants disrupt DUOX2 enzymatic activity, resulting in impaired H2O2 production, as confirmed by in vitro functional studies. Oligogenic mutation patterns within the DUOX system are prevalent among Chinese CH patients.","method":"Targeted next-generation sequencing / whole exome sequencing; in vitro functional H2O2 production assay for each variant","journal":"European journal of endocrinology","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro functional assay across multiple variants, large patient cohort, single lab","pmids":["40510014"],"is_preprint":false},{"year":2025,"finding":"Social disruption stress upregulates Duoxa2 (alongside Duox2 and Nos2) expression in intestinal epithelial cells via β-adrenergic receptor signaling; this upregulation is reversed by β-AR blockade (propranolol) but not by α2-adrenergic, glucocorticoid, or CRHR1 inhibition.","method":"Mouse model with pharmacological antagonists; intestinal epithelial cell gene expression analysis; β-AR blockade with propranolol","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological dissection with multiple antagonists in vivo, specific pathway identified, preprint not yet peer-reviewed","pmids":[],"is_preprint":true},{"year":2024,"finding":"IL-17 signaling is required for upregulation of Duox2/Duoxa2 in the intestinal epithelium in response to Candida albicans colonization; mice lacking the IL-17 receptor fail to upregulate Duox2/Duoxa2, and addition of IL-17A to colonoids induces these genes with concomitant H2O2 production.","method":"Germ-free mouse colonization model; IL-17 receptor knockout mice; colonoid cultures with IL-17A; gene expression profiling; H2O2 measurement","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic knockout plus ex vivo colonoid functional assay, multiple orthogonal approaches; preprint, not peer-reviewed","pmids":[],"is_preprint":true}],"current_model":"DUOXA2 is a transmembrane maturation factor that forms a stable, disulfide-bonded complex with DUOX2 at the cell surface, enabling proper ER-to-apical-membrane trafficking of DUOX2 and reconstituting its H2O2-generating enzymatic activity; DUOXA2-mediated apical sorting of DUOX2 depends on the C-terminal region of DUOXA2 (not N-glycosylation), and the stability and folding of DUOXA2 itself depends on the prior oxidative folding of DUOX2, which acts in a chaperone-like capacity; transcription of DUOXA2 is co-regulated with DUOX2 via STAT1 (IFN-γ/JAK), STAT6 (IL-4/IL-13/JAK1), and β-adrenergic pathways, and loss-of-function mutations in DUOXA2 abolish DUOX2 activity and cause congenital hypothyroidism."},"narrative":{"mechanistic_narrative":"DUOXA2 is a transmembrane maturation factor that enables the dual oxidase DUOX2 to fold, traffic, and generate extracellular H2O2 at the cell surface [PMID:18042646, PMID:31513783]. It is essential and non-redundant for reconstituting DUOX2 enzymatic activity, and defined loss-of-function mutations (truncations and missense substitutions) abolish DUOX2-dependent H2O2 production [PMID:18042646, PMID:21367925, PMID:28626131, PMID:40510014]. DUOXA2 assembles with DUOX2 into an intermolecular disulfide-bonded complex, linking the N-terminal domain of DUOX2 to the two extracellular loops of DUOXA2; this assembly requires prior intramolecular disulfide bond formation within DUOX2 in the ER, such that DUOX2 acts as a chaperone-like partner whose oxidative folding determines the stability and function of DUOXA2 [PMID:25761904]. In polarized epithelia DUOXA2 directs DUOX2 to the apical plasma membrane through its C-terminal region, independently of N-glycosylation, whereas the paralog DUOXA1 missorts DUOX2 basolaterally [PMID:39126279]. The Duox2/DuoxA2 complex is the most active H2O2-generating module, and the H2O2 it produces can induce DNA damage in expressing cells [PMID:31513783]. Transcription of DUOXA2 is co-regulated with DUOX2 by JAK-STAT signaling, induced by IFN-γ via STAT1 and by IL-4/IL-13 via JAK1-STAT6, the two cytokine arms acting antagonistically [PMID:21321110, PMID:23010498]. Loss-of-function DUOXA2 variants cause congenital hypothyroidism, frequently in oligogenic combination with other DUOX-system genes [PMID:28626131, PMID:40510014].","teleology":[{"year":2007,"claim":"Established that DUOXA2 is functionally required for DUOX2 activity, defining it as a maturation factor rather than an incidental partner.","evidence":"In vitro reconstitution with a C-terminal truncation mutant (p.Y246X) in a cell expression system","pmids":["18042646"],"confidence":"High","gaps":["Did not resolve whether the requirement is for folding, trafficking, or catalytic assembly","Single mutant; structural basis of the C-terminal requirement unknown"]},{"year":2011,"claim":"Showed that DUOXA-DUOX heterodimerization is obligatory for enzyme maturation and that DUOXA1 and DUOXA2 are partially redundant, framing maturation factor specificity.","evidence":"In vitro reconstitution with C189R missense mutant plus genetic mapping of a deletion spanning DUOX2/DUOXA1/DUOXA2","pmids":["21367925"],"confidence":"High","gaps":["Extent and physiological limits of DUOXA1/DUOXA2 redundancy not defined","Molecular interface of heterodimerization not yet mapped"]},{"year":2011,"claim":"Identified the first transcriptional control of DUOXA2, co-induced with DUOX2 by IFN-γ, placing the maturation factor under immune cytokine regulation.","evidence":"IFN-γ treatment of pancreatic cancer cells, qPCR, pathway inhibition, and STAT1 ChIP on the DUOX2 promoter","pmids":["21321110"],"confidence":"Medium","gaps":["STAT1 binding shown on DUOX2 promoter; direct DUOXA2 promoter occupancy not demonstrated","Requires JAK-STAT1 plus p38-MAPK, but their integration is unresolved"]},{"year":2012,"claim":"Extended transcriptional regulation to the Th2 axis, showing IL-4/IL-13 selectively co-induce DUOX2/DUOXA2 and that IFN-γ antagonizes this, defining cytokine-balanced control.","evidence":"Cytokine treatment of primary thyrocytes and Caco-2 cells, qRT-PCR, H2O2 measurement, JAK-STAT inhibition","pmids":["23010498"],"confidence":"Medium","gaps":["Direct STAT6 binding to DUOXA2 regulatory elements not shown","Mechanism of IFN-γ/IL-4 antagonism unresolved"]},{"year":2015,"claim":"Defined the physical basis of the complex, demonstrating disulfide bridges between DUOX2 and DUOXA2 extracellular loops and that DUOX2 oxidative folding chaperones DUOXA2 stability.","evidence":"Cysteine mutagenesis, disulfide bond analysis, co-immunoprecipitation, and functional assays","pmids":["25761904"],"confidence":"High","gaps":["No structure of the assembled complex","Order of folding events in the ER not fully resolved"]},{"year":2017,"claim":"Confirmed a patient-derived nonsense allele (p.Tyr138*) as loss-of-function, linking DUOXA2 mutation to disrupted DUOX2 activity in congenital hypothyroidism.","evidence":"HEK293 expression with functional reconstitution assay","pmids":["28626131"],"confidence":"Medium","gaps":["Single method, single lab","Genotype-phenotype correlation not established"]},{"year":2019,"claim":"Localized the active complex to the cell surface and showed it is the most potent H2O2 generator, with DUOXA2 N-glycosylation required for DUOX2 maturation and the product capable of inducing DNA damage.","evidence":"Inducible HEK293 lines, Duolink proximity ligation, H2O2 and DNA damage assays, glycosylation-defective mutants","pmids":["31513783"],"confidence":"High","gaps":["Reconciling the glycosylation requirement here with later finding that glycosylation is dispensable for apical sorting","DNA damage relevance to physiological tissue not tested"]},{"year":2024,"claim":"Revealed a trafficking role: DUOXA2 directs apical sorting of DUOX2 via its C-terminal region independent of N-glycosylation, distinguishing it functionally from DUOXA1.","evidence":"Co-expression in polarized MDCK cells, confocal immunofluorescence, glycosylation-defective mutants","pmids":["39126279"],"confidence":"High","gaps":["Specific apical sorting motif within the C-terminus not mapped","Sorting machinery/adaptors recognizing DUOXA2 unknown"]},{"year":2024,"claim":"Connected DUOXA2 induction to mucosal antifungal defense, showing IL-17 signaling drives Duox2/Duoxa2 upregulation upon Candida colonization.","evidence":"Germ-free colonization, IL-17 receptor knockout mice, IL-17A-treated colonoids with H2O2 readout (preprint)","pmids":[],"confidence":"Medium","gaps":["Preprint, not peer-reviewed","Direct transcriptional mechanism downstream of IL-17 not defined"]},{"year":2025,"claim":"Demonstrated neuro-immune control, with social stress upregulating Duoxa2 in intestinal epithelium specifically through β-adrenergic signaling.","evidence":"Mouse model with pharmacological antagonists; intestinal epithelial gene expression; propranolol β-AR blockade (preprint)","pmids":[],"confidence":"Medium","gaps":["Preprint, not peer-reviewed","Whether β-AR acts directly on epithelial DUOXA2 transcription is unresolved"]},{"year":2025,"claim":"Broadened the disease genetics, showing multiple DUOXA2 variants impair DUOX2 H2O2 production and that oligogenic DUOX-system mutations are common in congenital hypothyroidism.","evidence":"Targeted/whole-exome sequencing in a patient cohort with in vitro H2O2 functional assays per variant","pmids":["40510014"],"confidence":"Medium","gaps":["Contribution of individual variants within oligogenic backgrounds hard to isolate","Structural mechanism of variant-specific defects not defined"]},{"year":null,"claim":"The structural architecture of the DUOX2-DUOXA2 complex and the molecular machinery recognizing the DUOXA2 C-terminal apical sorting determinant remain unresolved.","evidence":"No structural or sorting-adaptor study present in the corpus","pmids":[],"confidence":"Low","gaps":["No structure of the assembled complex","Apical sorting motif and its recognition factors unidentified","Direct DUOXA2 promoter elements for STAT1/STAT6 not mapped"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,1,2,3]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,4]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[3,4]},{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[2]}],"pathway":[{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[0,2,4]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[5,6]}],"complexes":["DUOX2-DUOXA2 maturation complex"],"partners":["DUOX2"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q1HG44","full_name":"Dual oxidase maturation factor 2","aliases":["Dual oxidase activator 2"],"length_aa":320,"mass_kda":34.8,"function":"Required for the maturation and transport of functional DUOX2 from the endoplasmic reticulum to the plasma membrane (PubMed:16651268). Recruits DUOX2 to the apical cell membrane (PubMed:39126279)","subcellular_location":"Endoplasmic reticulum membrane; Apical cell membrane","url":"https://www.uniprot.org/uniprotkb/Q1HG44/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/DUOXA2","classification":"Not Classified","n_dependent_lines":13,"n_total_lines":1208,"dependency_fraction":0.01076158940397351},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/DUOXA2","total_profiled":1310},"omim":[{"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"},{"mim_id":"606759","title":"DUAL OXIDASE 2; DUOX2","url":"https://www.omim.org/entry/606759"},{"mim_id":"606758","title":"DUAL OXIDASE 1; DUOX1","url":"https://www.omim.org/entry/606758"},{"mim_id":"274900","title":"THYROID DYSHORMONOGENESIS 5; TDH5","url":"https://www.omim.org/entry/274900"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"gallbladder","ntpm":60.1},{"tissue":"urinary bladder","ntpm":39.0}],"url":"https://www.proteinatlas.org/search/DUOXA2"},"hgnc":{"alias_symbol":[],"prev_symbol":[]},"alphafold":{"accession":"Q1HG44","domains":[{"cath_id":"-","chopping":"78-169","consensus_level":"medium","plddt":92.6225,"start":78,"end":169}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q1HG44","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q1HG44-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q1HG44-F1-predicted_aligned_error_v6.png","plddt_mean":83.06},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=DUOXA2","jax_strain_url":"https://www.jax.org/strain/search?query=DUOXA2"},"sequence":{"accession":"Q1HG44","fasta_url":"https://rest.uniprot.org/uniprotkb/Q1HG44.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q1HG44/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q1HG44"}},"corpus_meta":[{"pmid":"18042646","id":"PMC_18042646","title":"Biallelic inactivation of the dual oxidase maturation factor 2 (DUOXA2) gene as a novel cause of congenital hypothyroidism.","date":"2007","source":"The Journal of clinical endocrinology and metabolism","url":"https://pubmed.ncbi.nlm.nih.gov/18042646","citation_count":129,"is_preprint":false},{"pmid":"24492313","id":"PMC_24492313","title":"DUOX2 and DUOXA2 form the predominant enzyme system capable of producing the reactive oxygen species H2O2 in active ulcerative colitis and are modulated by 5-aminosalicylic acid.","date":"2014","source":"Inflammatory bowel diseases","url":"https://pubmed.ncbi.nlm.nih.gov/24492313","citation_count":83,"is_preprint":false},{"pmid":"21321110","id":"PMC_21321110","title":"Up-regulation and sustained activation of Stat1 are essential for interferon-gamma (IFN-gamma)-induced dual oxidase 2 (Duox2) and dual oxidase A2 (DuoxA2) expression in human pancreatic cancer cell lines.","date":"2011","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/21321110","citation_count":61,"is_preprint":false},{"pmid":"21367925","id":"PMC_21367925","title":"A single copy of the recently identified dual oxidase maturation factor (DUOXA) 1 gene produces only mild transient hypothyroidism in a patient with a novel biallelic DUOXA2 mutation and monoallelic DUOXA1 deletion.","date":"2011","source":"The Journal of clinical endocrinology and metabolism","url":"https://pubmed.ncbi.nlm.nih.gov/21367925","citation_count":50,"is_preprint":false},{"pmid":"31044655","id":"PMC_31044655","title":"DUOX2/DUOXA2 Mutations Frequently Cause Congenital Hypothyroidism that Evades Detection on Newborn Screening in the United Kingdom.","date":"2019","source":"Thyroid : official journal of the American Thyroid Association","url":"https://pubmed.ncbi.nlm.nih.gov/31044655","citation_count":44,"is_preprint":false},{"pmid":"25761904","id":"PMC_25761904","title":"When an Intramolecular Disulfide Bridge Governs the Interaction of DUOX2 with Its Partner DUOXA2.","date":"2015","source":"Antioxidants & redox signaling","url":"https://pubmed.ncbi.nlm.nih.gov/25761904","citation_count":31,"is_preprint":false},{"pmid":"32425884","id":"PMC_32425884","title":"DUOX2 and DUOXA2 Variants Confer Susceptibility to Thyroid Dysgenesis and Gland-in-situ With Congenital Hypothyroidism.","date":"2020","source":"Frontiers in endocrinology","url":"https://pubmed.ncbi.nlm.nih.gov/32425884","citation_count":28,"is_preprint":false},{"pmid":"23010498","id":"PMC_23010498","title":"Thyroid hydrogen peroxide production is enhanced by the Th2 cytokines, IL-4 and IL-13, through increased expression of the dual oxidase 2 and its maturation factor DUOXA2.","date":"2012","source":"Free radical biology & medicine","url":"https://pubmed.ncbi.nlm.nih.gov/23010498","citation_count":27,"is_preprint":false},{"pmid":"26758695","id":"PMC_26758695","title":"A Novel c.554+5C>T Mutation in the DUOXA2 Gene Combined with p.R885Q Mutation in the DUOX2 Gene Causing Congenital Hypothyroidism.","date":"2015","source":"Journal of clinical research in pediatric endocrinology","url":"https://pubmed.ncbi.nlm.nih.gov/26758695","citation_count":17,"is_preprint":false},{"pmid":"31513783","id":"PMC_31513783","title":"The Dual Oxidase Duox2 stabilized with DuoxA2 in an enzymatic complex at the surface of the cell produces extracellular H2O2 able to induce DNA damage in an inducible cellular model.","date":"2019","source":"Experimental cell research","url":"https://pubmed.ncbi.nlm.nih.gov/31513783","citation_count":15,"is_preprint":false},{"pmid":"28626131","id":"PMC_28626131","title":"Homozygous DUOXA2 mutation (p.Tyr138*) in a girl with congenital hypothyroidism and her apparently unaffected brother: Case report and review of the literature.","date":"2017","source":"Endocrine journal","url":"https://pubmed.ncbi.nlm.nih.gov/28626131","citation_count":10,"is_preprint":false},{"pmid":"39126279","id":"PMC_39126279","title":"The NADPH oxidases DUOX1 and DUOX2 are sorted to the apical plasma membrane in epithelial cells via their respective maturation factors DUOXA1 and DUOXA2.","date":"2024","source":"Genes to cells : devoted to molecular & cellular mechanisms","url":"https://pubmed.ncbi.nlm.nih.gov/39126279","citation_count":7,"is_preprint":false},{"pmid":"28541007","id":"PMC_28541007","title":"Compound Heterozygous Mutations in the DUOX2/DUOXA2 Genes Cause Congenital Hypothyroidism.","date":"2017","source":"Yonsei medical journal","url":"https://pubmed.ncbi.nlm.nih.gov/28541007","citation_count":7,"is_preprint":false},{"pmid":"30110704","id":"PMC_30110704","title":"Fetal Goitrous Hypothyroidism and Polyhydramnios in a Patient with Compound Heterozygous DUOXA2 Mutations.","date":"2018","source":"Hormone research in paediatrics","url":"https://pubmed.ncbi.nlm.nih.gov/30110704","citation_count":7,"is_preprint":false},{"pmid":"39673194","id":"PMC_39673194","title":"The role of DUOXA2 in the clinical diagnosis of paediatric congenital hypothyroidism.","date":"2024","source":"Annals of medicine","url":"https://pubmed.ncbi.nlm.nih.gov/39673194","citation_count":4,"is_preprint":false},{"pmid":"32252219","id":"PMC_32252219","title":"Persistent goiter with congenital hypothyroidism due to mutation in DUOXA2 gene.","date":"2020","source":"Annals of pediatric endocrinology & metabolism","url":"https://pubmed.ncbi.nlm.nih.gov/32252219","citation_count":4,"is_preprint":false},{"pmid":"28100324","id":"PMC_28100324","title":"[Characteristics of DUOXA2 gene mutation in children with congenital hypothyroidism].","date":"2017","source":"Zhongguo dang dai er ke za zhi = Chinese journal of contemporary pediatrics","url":"https://pubmed.ncbi.nlm.nih.gov/28100324","citation_count":3,"is_preprint":false},{"pmid":"27349010","id":"PMC_27349010","title":"Heterozygous Mutations of the DUOXA2 and DUOX2 Genes in Dizygotic Twins with Congenital Hypothyroidism.","date":"2016","source":"Clinical 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compartments","date":"2025-07-18","source":"bioRxiv","url":"https://doi.org/10.1101/2025.07.15.664961","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2024.08.16.608271","title":"An IL-17-DUOX2 axis controls gastrointestinal colonization by  <i>Candida albicans</i>","date":"2024-08-19","source":"bioRxiv","url":"https://doi.org/10.1101/2024.08.16.608271","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":14870,"output_tokens":3001,"usd":0.044812,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":10286,"output_tokens":3650,"usd":0.07134,"stage2_stop_reason":"end_turn"},"total_usd":0.116152,"stage1_batch_id":"msgbatch_01AsR7g8dGTEiEw9U83bJeWn","stage2_batch_id":"msgbatch_01YV5ZyxtFNUZEjxRcpd9jzb","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2007,\n      \"finding\": \"DUOXA2 is required to reconstitute DUOX2 enzymatic activity; a truncated DUOXA2 mutant (p.Y246X) lacking transmembrane helix 5 and the C-terminal cytoplasmic domain is completely inactive in reconstituting DUOX2 H2O2-generating activity in vitro.\",\n      \"method\": \"In vitro reconstitution assay with mutant DUOXA2 protein in cell expression system\",\n      \"journal\": \"The Journal of clinical endocrinology and metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct in vitro reconstitution assay with defined loss-of-function mutant, single lab but clear functional readout\",\n      \"pmids\": [\"18042646\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"DUOXA2 missense mutation C189R causes complete loss-of-function in reconstituting DUOX2 activity in vitro; heterodimerization of DUOX with specific maturation factors (DUOXA1 or DUOXA2) is essential for maturation and function of the DUOX enzyme complexes, and functional redundancy exists between DUOXA1 and DUOXA2.\",\n      \"method\": \"In vitro reconstitution assay; genetic mapping of deletion encompassing DUOX2, DUOXA1, DUOXA2\",\n      \"journal\": \"The Journal of clinical endocrinology and metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with defined mutant, supported by genetic analysis, single lab\",\n      \"pmids\": [\"21367925\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"DUOXA2 forms an intermolecular disulfide-bonded complex with DUOX2 via interdisulfide bridges between the N-terminal domain of DUOX2 and the two extracellular loops of DUOXA2. This interaction depends on prior intramolecular disulfide bond formation (cys-124 to cys-1162) within DUOX2 in the ER, indicating DUOX2 acts as a chaperone-like partner for DUOXA2 folding. Stability and function of DUOXA2 are dependent on the oxidative folding of DUOX2.\",\n      \"method\": \"Cysteine mutagenesis, disulfide bond analysis, co-immunoprecipitation, functional activity assays\",\n      \"journal\": \"Antioxidants & redox signaling\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — mutagenesis combined with biochemical interaction assays and functional readout, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"25761904\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"DUOX2 and DUOXA2 form a stable enzymatic complex at the cell surface that produces extracellular H2O2. The Duox2/DuoxA2 complex is the most active H2O2-generating complex compared to Duox1/DuoxA1. Glycosylation-defective DUOXA2 drastically impairs DUOX2 maturation and activity, whereas unglycosylated DuoxA1 has limited impact on Duox1. H2O2 produced by the Duox2/DuoxA2 cell surface complex induces DNA damage in nuclei of expressing cells.\",\n      \"method\": \"Inducible HEK293 Tet-On3G cell lines expressing Duox/DuoxA combinations; Duolink proximity ligation assay for cell surface interaction; H2O2 measurement; DNA damage assays; glycosylation-defective mutants\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — multiple orthogonal methods including reconstitution, proximity ligation, mutagenesis, and functional assays in a single study\",\n      \"pmids\": [\"31513783\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"DUOXA2 is required for apical plasma membrane sorting of DUOX2 in polarized epithelial cells. DUOX2 is missorted to the basolateral membrane when paired with DUOXA1 instead of DUOXA2. N-glycosylation of DUOXA2 is dispensable for DUOX2 apical recruitment (unlike DUOXA1 where N-glycosylation is required), but the C-terminal region of DUOXA2 appears to be involved in directing apical sorting.\",\n      \"method\": \"Co-expression in MDCK epithelial cells; confocal immunofluorescence microscopy for apical vs. basolateral localization; glycosylation-defective mutants\",\n      \"journal\": \"Genes to cells : devoted to molecular & cellular mechanisms\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization experiment with functional consequence, multiple mutant constructs and orthogonal lines of evidence, single lab\",\n      \"pmids\": [\"39126279\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"IFN-γ induces co-upregulation of DUOX2 and its maturation factor DUOXA2 (but not other NOX family members) in human pancreatic cancer cells, associated with increased H2O2 production. This induction requires both the canonical JAK-STAT1 pathway and the p38-MAPK pathway, with STAT1 binding directly to elements of the DUOX2 promoter.\",\n      \"method\": \"Cytokine treatment, quantitative PCR, ROS/H2O2 measurement, pharmacological pathway inhibition, chromatin immunoprecipitation (STAT1 promoter binding)\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP for STAT1 binding, pharmacological inhibition, H2O2 measurement; mechanistic detail on regulatory pathway; single lab\",\n      \"pmids\": [\"21321110\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"IL-4 and IL-13 (Th2 cytokines) specifically upregulate DUOX2 and DUOXA2 (but not DUOX1/DUOXA1) in human thyrocytes and intestinal Caco-2 cells, leading to increased calcium-stimulated extracellular H2O2 generation. This induction requires the JAK1-STAT6 cascade activated by the IL-4 type 2 receptor. IFN-γ inhibits this DUOX2/DUOXA2 induction.\",\n      \"method\": \"Cytokine treatment of primary thyrocytes and Caco-2 cells; quantitative RT-PCR; H2O2 measurement; pharmacological JAK-STAT pathway inhibition\",\n      \"journal\": \"Free radical biology & medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional H2O2 readout combined with pathway inhibition, isoform specificity demonstrated, single lab\",\n      \"pmids\": [\"23010498\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"DUOXA2 nonsense mutation p.Tyr138* (homozygous) is a loss-of-function mutation, confirmed by expression experiments in HEK293 cells showing inability to reconstitute DUOX2 activity.\",\n      \"method\": \"HEK293 cell expression system with functional reconstitution assay\",\n      \"journal\": \"Endocrine journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — in vitro reconstitution assay, single lab, single method\",\n      \"pmids\": [\"28626131\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Ten DUOXA2 variants disrupt DUOX2 enzymatic activity, resulting in impaired H2O2 production, as confirmed by in vitro functional studies. Oligogenic mutation patterns within the DUOX system are prevalent among Chinese CH patients.\",\n      \"method\": \"Targeted next-generation sequencing / whole exome sequencing; in vitro functional H2O2 production assay for each variant\",\n      \"journal\": \"European journal of endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro functional assay across multiple variants, large patient cohort, single lab\",\n      \"pmids\": [\"40510014\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Social disruption stress upregulates Duoxa2 (alongside Duox2 and Nos2) expression in intestinal epithelial cells via β-adrenergic receptor signaling; this upregulation is reversed by β-AR blockade (propranolol) but not by α2-adrenergic, glucocorticoid, or CRHR1 inhibition.\",\n      \"method\": \"Mouse model with pharmacological antagonists; intestinal epithelial cell gene expression analysis; β-AR blockade with propranolol\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological dissection with multiple antagonists in vivo, specific pathway identified, preprint not yet peer-reviewed\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"IL-17 signaling is required for upregulation of Duox2/Duoxa2 in the intestinal epithelium in response to Candida albicans colonization; mice lacking the IL-17 receptor fail to upregulate Duox2/Duoxa2, and addition of IL-17A to colonoids induces these genes with concomitant H2O2 production.\",\n      \"method\": \"Germ-free mouse colonization model; IL-17 receptor knockout mice; colonoid cultures with IL-17A; gene expression profiling; H2O2 measurement\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knockout plus ex vivo colonoid functional assay, multiple orthogonal approaches; preprint, not peer-reviewed\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"DUOXA2 is a transmembrane maturation factor that forms a stable, disulfide-bonded complex with DUOX2 at the cell surface, enabling proper ER-to-apical-membrane trafficking of DUOX2 and reconstituting its H2O2-generating enzymatic activity; DUOXA2-mediated apical sorting of DUOX2 depends on the C-terminal region of DUOXA2 (not N-glycosylation), and the stability and folding of DUOXA2 itself depends on the prior oxidative folding of DUOX2, which acts in a chaperone-like capacity; transcription of DUOXA2 is co-regulated with DUOX2 via STAT1 (IFN-γ/JAK), STAT6 (IL-4/IL-13/JAK1), and β-adrenergic pathways, and loss-of-function mutations in DUOXA2 abolish DUOX2 activity and cause congenital hypothyroidism.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"DUOXA2 is a transmembrane maturation factor that enables the dual oxidase DUOX2 to fold, traffic, and generate extracellular H2O2 at the cell surface [#0, #3]. It is essential and non-redundant for reconstituting DUOX2 enzymatic activity, and defined loss-of-function mutations (truncations and missense substitutions) abolish DUOX2-dependent H2O2 production [#0, #1, #7, #8]. DUOXA2 assembles with DUOX2 into an intermolecular disulfide-bonded complex, linking the N-terminal domain of DUOX2 to the two extracellular loops of DUOXA2; this assembly requires prior intramolecular disulfide bond formation within DUOX2 in the ER, such that DUOX2 acts as a chaperone-like partner whose oxidative folding determines the stability and function of DUOXA2 [#2]. In polarized epithelia DUOXA2 directs DUOX2 to the apical plasma membrane through its C-terminal region, independently of N-glycosylation, whereas the paralog DUOXA1 missorts DUOX2 basolaterally [#4]. The Duox2/DuoxA2 complex is the most active H2O2-generating module, and the H2O2 it produces can induce DNA damage in expressing cells [#3]. Transcription of DUOXA2 is co-regulated with DUOX2 by JAK-STAT signaling, induced by IFN-\\u03b3 via STAT1 and by IL-4/IL-13 via JAK1-STAT6, the two cytokine arms acting antagonistically [#5, #6]. Loss-of-function DUOXA2 variants cause congenital hypothyroidism, frequently in oligogenic combination with other DUOX-system genes [#7, #8].\",\n  \"teleology\": [\n    {\n      \"year\": 2007,\n      \"claim\": \"Established that DUOXA2 is functionally required for DUOX2 activity, defining it as a maturation factor rather than an incidental partner.\",\n      \"evidence\": \"In vitro reconstitution with a C-terminal truncation mutant (p.Y246X) in a cell expression system\",\n      \"pmids\": [\"18042646\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve whether the requirement is for folding, trafficking, or catalytic assembly\", \"Single mutant; structural basis of the C-terminal requirement unknown\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Showed that DUOXA-DUOX heterodimerization is obligatory for enzyme maturation and that DUOXA1 and DUOXA2 are partially redundant, framing maturation factor specificity.\",\n      \"evidence\": \"In vitro reconstitution with C189R missense mutant plus genetic mapping of a deletion spanning DUOX2/DUOXA1/DUOXA2\",\n      \"pmids\": [\"21367925\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Extent and physiological limits of DUOXA1/DUOXA2 redundancy not defined\", \"Molecular interface of heterodimerization not yet mapped\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Identified the first transcriptional control of DUOXA2, co-induced with DUOX2 by IFN-\\u03b3, placing the maturation factor under immune cytokine regulation.\",\n      \"evidence\": \"IFN-\\u03b3 treatment of pancreatic cancer cells, qPCR, pathway inhibition, and STAT1 ChIP on the DUOX2 promoter\",\n      \"pmids\": [\"21321110\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"STAT1 binding shown on DUOX2 promoter; direct DUOXA2 promoter occupancy not demonstrated\", \"Requires JAK-STAT1 plus p38-MAPK, but their integration is unresolved\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Extended transcriptional regulation to the Th2 axis, showing IL-4/IL-13 selectively co-induce DUOX2/DUOXA2 and that IFN-\\u03b3 antagonizes this, defining cytokine-balanced control.\",\n      \"evidence\": \"Cytokine treatment of primary thyrocytes and Caco-2 cells, qRT-PCR, H2O2 measurement, JAK-STAT inhibition\",\n      \"pmids\": [\"23010498\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct STAT6 binding to DUOXA2 regulatory elements not shown\", \"Mechanism of IFN-\\u03b3/IL-4 antagonism unresolved\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Defined the physical basis of the complex, demonstrating disulfide bridges between DUOX2 and DUOXA2 extracellular loops and that DUOX2 oxidative folding chaperones DUOXA2 stability.\",\n      \"evidence\": \"Cysteine mutagenesis, disulfide bond analysis, co-immunoprecipitation, and functional assays\",\n      \"pmids\": [\"25761904\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structure of the assembled complex\", \"Order of folding events in the ER not fully resolved\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Confirmed a patient-derived nonsense allele (p.Tyr138*) as loss-of-function, linking DUOXA2 mutation to disrupted DUOX2 activity in congenital hypothyroidism.\",\n      \"evidence\": \"HEK293 expression with functional reconstitution assay\",\n      \"pmids\": [\"28626131\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single method, single lab\", \"Genotype-phenotype correlation not established\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Localized the active complex to the cell surface and showed it is the most potent H2O2 generator, with DUOXA2 N-glycosylation required for DUOX2 maturation and the product capable of inducing DNA damage.\",\n      \"evidence\": \"Inducible HEK293 lines, Duolink proximity ligation, H2O2 and DNA damage assays, glycosylation-defective mutants\",\n      \"pmids\": [\"31513783\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Reconciling the glycosylation requirement here with later finding that glycosylation is dispensable for apical sorting\", \"DNA damage relevance to physiological tissue not tested\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Revealed a trafficking role: DUOXA2 directs apical sorting of DUOX2 via its C-terminal region independent of N-glycosylation, distinguishing it functionally from DUOXA1.\",\n      \"evidence\": \"Co-expression in polarized MDCK cells, confocal immunofluorescence, glycosylation-defective mutants\",\n      \"pmids\": [\"39126279\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific apical sorting motif within the C-terminus not mapped\", \"Sorting machinery/adaptors recognizing DUOXA2 unknown\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Connected DUOXA2 induction to mucosal antifungal defense, showing IL-17 signaling drives Duox2/Duoxa2 upregulation upon Candida colonization.\",\n      \"evidence\": \"Germ-free colonization, IL-17 receptor knockout mice, IL-17A-treated colonoids with H2O2 readout (preprint)\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Preprint, not peer-reviewed\", \"Direct transcriptional mechanism downstream of IL-17 not defined\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Demonstrated neuro-immune control, with social stress upregulating Duoxa2 in intestinal epithelium specifically through \\u03b2-adrenergic signaling.\",\n      \"evidence\": \"Mouse model with pharmacological antagonists; intestinal epithelial gene expression; propranolol \\u03b2-AR blockade (preprint)\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Preprint, not peer-reviewed\", \"Whether \\u03b2-AR acts directly on epithelial DUOXA2 transcription is unresolved\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Broadened the disease genetics, showing multiple DUOXA2 variants impair DUOX2 H2O2 production and that oligogenic DUOX-system mutations are common in congenital hypothyroidism.\",\n      \"evidence\": \"Targeted/whole-exome sequencing in a patient cohort with in vitro H2O2 functional assays per variant\",\n      \"pmids\": [\"40510014\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Contribution of individual variants within oligogenic backgrounds hard to isolate\", \"Structural mechanism of variant-specific defects not defined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The structural architecture of the DUOX2-DUOXA2 complex and the molecular machinery recognizing the DUOXA2 C-terminal apical sorting determinant remain unresolved.\",\n      \"evidence\": \"No structural or sorting-adaptor study present in the corpus\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No structure of the assembled complex\", \"Apical sorting motif and its recognition factors unidentified\", \"Direct DUOXA2 promoter elements for STAT1/STAT6 not mapped\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 1, 2, 3]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 4]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [3, 4]},\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [2]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [0, 2, 4]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [5, 6]}\n    ],\n    \"complexes\": [\"DUOX2-DUOXA2 maturation complex\"],\n    \"partners\": [\"DUOX2\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}