{"gene":"DSG3","run_date":"2026-04-28T17:46:03","timeline":{"discoveries":[{"year":1994,"finding":"The extracellular domain of Dsg3 (produced in eukaryotic baculovirus/COS7 cells) carries conformational epitopes recognized by pathogenic pemphigus vulgaris autoantibodies; this properly folded recombinant domain absorbs pathogenic IgG and prevents blister formation in a neonatal mouse passive-transfer model, establishing the extracellular domain as the target of pathogenic autoantibodies.","method":"Baculovirus/COS7 recombinant protein production, immunoadsorption of patient sera, neonatal mouse passive-transfer blister model","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 1–2 — in vitro functional assay combined with in vivo passive-transfer model; foundational paper with >270 citations","pmids":["8040292"],"is_preprint":false},{"year":1995,"finding":"Dsg3 binds plakoglobin directly through the carboxy-terminal 87 amino acids of its intracytoplasmic cadherin-like subdomain; the desmoglein-specific intracytoplasmic subdomains are dispensable for this interaction, demonstrated both by co-immunoprecipitation of chimeric constructs in HaCaT cells and by cell-free in vitro transcription/translation.","method":"Chimeric E-cadherin/Dsg3 expression constructs, co-immunoprecipitation in HaCaT keratinocytes, in vitro transcription/translation binding assay","journal":"The Journal of investigative dermatology","confidence":"High","confidence_rationale":"Tier 1 — direct binding confirmed both in-cell co-IP and cell-free in vitro reconstitution; two orthogonal methods in same study","pmids":["7738346"],"is_preprint":false},{"year":1996,"finding":"Proper conformational epitope formation of Dsg3 requires transport through the endoplasmic reticulum (signal peptide-dependent); proteolytic processing of the prosequence and glycosylation are dispensable, but cytosolic accumulation (absence of signal peptide) abolishes conformational epitope formation.","method":"Baculovirus expression of signal-peptide-deleted and protease-cleavage-site-mutant Dsg3 constructs; immunoadsorption activity assay with PV patient sera","journal":"The Journal of investigative dermatology","confidence":"High","confidence_rationale":"Tier 1 — mutagenesis combined with functional immunoadsorption assay; multiple mutant constructs tested","pmids":["8823357"],"is_preprint":false},{"year":1999,"finding":"PV-IgG binding to surface Dsg3 rapidly depletes Dsg3 from the detergent-soluble membrane pool within 20 minutes, subsequently forming Dsg3-depleted desmosomes that retain Dsg1, desmoplakin, plakoglobin, and keratin filaments; prolonged exposure causes loss of Dsg3 from the cytoskeletal (detergent-insoluble) pool as well.","method":"Sequential detergent fractionation (PBS-soluble / Triton X-100-soluble / Triton X-100-insoluble), immunoblotting, double immunofluorescence microscopy in DJM-1 human squamous carcinoma cells","journal":"The Journal of investigative dermatology","confidence":"High","confidence_rationale":"Tier 2 — reciprocal fractionation and imaging; replicated with monoclonal antibodies in follow-up study (PMID 17428808)","pmids":["9886266"],"is_preprint":false},{"year":2007,"finding":"Monoclonal anti-Dsg3 antibodies deplete Dsg3 from desmosomes in a manner that correlates with their pathogenic activity; individual antibodies show characteristic depletion limits and combinations exert cumulative/synergistic depletion, indicating that polyclonal PV-IgG pathogenicity arises from antibody diversity against multiple Dsg3 epitopes.","method":"Monoclonal antibody treatment of DJM-1 cells and normal human keratinocytes, detergent fractionation, immunofluorescence, dispase-based adhesion strength assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — four different monoclonal antibodies tested with orthogonal readouts; mechanistic extension of prior fractionation findings","pmids":["17428808"],"is_preprint":false},{"year":2010,"finding":"PV IgG causes Dsg3 loss of cell adhesion through three sequential phases: (1) rapid internalization of non-junctional Dsg3, (2) retrograde transport of surface Dsg3 complexes along linear arrays perpendicular to cell contacts into cytoplasmic vesicles, and (3) depletion of detergent-insoluble Dsg3 and loss of adhesion strength; expressing exogenous Dsg3 prevents disassembly by driving biosynthesis and desmosome reassembly.","method":"Live and fixed immunofluorescence microscopy of primary human keratinocytes, biochemical fractionation, exogenous Dsg3 overexpression rescue experiment, PV patient IgG treatment","journal":"The Journal of investigative dermatology","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (live imaging, fractionation, rescue experiment) establishing ordered pathway in a single study","pmids":["21160493"],"is_preprint":false},{"year":2013,"finding":"DSG3 retains plakoglobin at the cell membrane/cytoplasm; DSG3 silencing disrupts the DSG3–plakoglobin interaction, triggers plakoglobin nuclear translocation, increases plakoglobin–TCF interaction, and suppresses TCF/LEF transcriptional activity, reducing downstream c-Myc, cyclin D1, and MMP-7 expression, thereby promoting G0/G1 arrest and reducing migration/invasion in head and neck cancer cells.","method":"RNA interference knockdown, co-immunoprecipitation, immunofluorescence, TCF/LEF luciferase reporter assay, Western blot, flow cytometry (cell cycle), in vitro migration/invasion assays, xenograft tumor model","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (co-IP, reporter assay, KD phenotype, in vivo xenograft) in a single study establishing a defined signaling pathway","pmids":["23737966"],"is_preprint":false},{"year":2015,"finding":"Extradesmosomal Dsg3 forms a complex with E-cadherin, β-catenin, and Src; Src activity regulates the stability of this complex, phosphorylates both Dsg3 and E-cadherin on tyrosine residues, and is required for recruiting Dsg3 to the cytoskeletal pool and for desmosome maturation to a Ca²⁺-insensitive (hyper-adhesive) state.","method":"Co-immunoprecipitation, E-cadherin overexpression and silencing, Src inhibitor treatment, immunofluorescence, detergent fractionation, tyrosine phosphorylation assays, p38 MAPK activation measurement in primary keratinocytes","journal":"Cellular and molecular life sciences : CMLS","confidence":"High","confidence_rationale":"Tier 2 — reciprocal co-IP identifying the complex plus multiple functional loss-of-function experiments with defined molecular readouts","pmids":["26115704"],"is_preprint":false},{"year":2015,"finding":"Dsg3 competes with inactive Src for binding to caveolin-1 (Cav-1) in a non-ionic detergent-soluble pool; elevated Dsg3 levels reduce Cav-1/Src co-localization, suggesting Dsg3 activates Src by displacing it from Cav-1-mediated inhibition. A caveolin-1 scaffolding domain binding region was identified in the Dsg3 carboxyl terminus.","method":"Co-immunoprecipitation, immunofluorescence co-localization, Dsg3 overexpression, sequence/domain analysis","journal":"Data in brief","confidence":"Low","confidence_rationale":"Tier 3 — single co-IP plus immunofluorescence; no direct binding reconstitution or mutagenesis validation","pmids":["26858977"],"is_preprint":false},{"year":2019,"finding":"Dsg3 is specifically required for PV-IgG-induced loss of keratinocyte adhesion: CRISPR/Cas9-generated Dsg3-deficient HaCaT cells are protected against PV-IgG-induced loss of cell adhesion, Src-dependent EGFR activation, and Src-dependent ERK activation, whereas Dsg2-deficient cells are not protected.","method":"CRISPR/Cas9 knockout of Dsg3 and Dsg2 in HaCaT keratinocytes, dispase dissociation assay, Ca²⁺ influx measurements, EGFR inhibitor treatment, Western blot for Src/ERK/p38 phosphorylation","journal":"Frontiers in immunology","confidence":"High","confidence_rationale":"Tier 2 — genetic KO with specific phenotypic rescue establishing pathway position; isogenic controls distinguish Dsg isoform specificity","pmids":["31178865"],"is_preprint":false},{"year":2021,"finding":"Anti-Dsg3 antibody-induced cell-cell dissociation involves p38 MAPK phosphorylation; externally applied mechanical stress mitigates antibody-induced monolayer fragmentation by activating RhoA and strengthening cortical actin, and also inhibits p38 MAPK phosphorylation induced by anti-Dsg3 antibody.","method":"Mechanical stress application to keratinocyte monolayers, monolayer fragmentation assay, Western blot for p38 MAPK phosphorylation, RhoA activity assay, actin imaging","journal":"Advanced biology","confidence":"Medium","confidence_rationale":"Tier 2 — defined signaling readout (p38, RhoA) with functional phenotype, but single study with no genetic validation of p38 in this context","pmids":["33724731"],"is_preprint":false},{"year":2023,"finding":"Antibodies targeting different epitopes of Dsg3 trigger distinct signaling: the EC1-domain antibody AK23 induces Dsg3 depletion and activates p38MAPK, Akt, and Src, whereas the EC5-domain antibody 2G4 activates p38MAPK and Akt but not Src and does not deplete Dsg3; Src and Akt activation are p38MAPK-dependent, establishing an epitope-specific Dsg3 signaling hierarchy.","method":"Dispase dissociation assay, Western blot (p38, Src, Akt phosphorylation), STED super-resolution microscopy, Rho/Rac GTPase GLISA, Ca²⁺ flux measurements, pharmacological inhibition of p38MAPK and Src","journal":"Frontiers in immunology","confidence":"High","confidence_rationale":"Tier 1–2 — multiple orthogonal methods with pharmacological epistasis establishing a signaling hierarchy downstream of Dsg3 epitope engagement","pmids":["37143675"],"is_preprint":false},{"year":2023,"finding":"Dsg3 exists in two distinct pools on living keratinocytes with different cytoskeletal anchorage: a cell-surface pool whose adhesion is dependent on actin filaments (disrupted by Latrunculin B), and a cell-cell contact pool whose adhesion is actin-independent but regulated by PKCα-controlled intermediate filament anchorage.","method":"Hybrid STED/single-molecule force spectroscopy AFM (STED/SMFS-AFM) on living keratinocytes, Latrunculin B (actin disruption), PMA (PKCα activation), pharmacological dissection of cytoskeletal contributions","journal":"Cellular and molecular life sciences : CMLS","confidence":"High","confidence_rationale":"Tier 1 — novel single-molecule force spectroscopy combined with super-resolution imaging on living cells; pharmacological dissection with two independent agents","pmids":["36602635"],"is_preprint":false},{"year":2023,"finding":"Homozygous loss-of-function deletion of the terminal exon of DSG3 causes acantholytic blistering of the oral and laryngeal mucosa (ABOLM), directly establishing that Dsg3 is required for mucosal epithelial adhesion integrity in vivo.","method":"Clinical genetics — homozygous deletion mapping by chromosomal microarray in dizygotic twins with ABOLM phenotype; exclusion of autoimmune mechanism","journal":"American journal of medical genetics. Part A","confidence":"Medium","confidence_rationale":"Tier 2 — human loss-of-function genetics with defined phenotype establishing in vivo requirement; no functional cell studies performed","pmids":["37850634"],"is_preprint":false},{"year":2025,"finding":"In bladder cancer cells, STAT3 transcriptionally activates DSG3 expression; DSG3 then promotes AKT phosphorylation, inhibits GSK3β, and drives β-catenin nuclear translocation, leading to transcriptional upregulation of SOX2 and MMP7 and thereby enhancing cancer stemness, EMT, migration, invasion, and metastasis.","method":"DSG3 knockdown in vitro and in vivo xenograft, Western blot (AKT, GSK3β, β-catenin, SOX2, MMP7), chromatin immunoprecipitation or reporter assay for STAT3 transcriptional activation, EMT and migration assays, mouse lung metastasis model","journal":"Journal of translational medicine","confidence":"Medium","confidence_rationale":"Tier 2 — KD with defined pathway readouts and in vivo validation, but a single lab study without independent replication","pmids":["40605005"],"is_preprint":false},{"year":2024,"finding":"PV autoantibodies targeting Dsg3 activate ER stress signaling pathways (IRE1α and PERK) in keratinocytes; ER tubules make frequent contacts with internalizing Dsg3 puncta, and pharmacological inhibition of ER stress protects against PV IgG-induced desmosome disruption and loss of keratinocyte cohesion.","method":"High-resolution time-lapse live imaging of ER–Dsg3 contacts, biochemical assays for IRE1α and PERK activation, pharmacological ER stress inhibition, dispase adhesion assay, transcriptomic analysis of PV patient skin","journal":"bioRxiv (preprint)","confidence":"Medium","confidence_rationale":"Tier 2 — live imaging plus biochemical pathway assay plus pharmacological rescue; not yet peer-reviewed","pmids":["bio_10.1101_2024.08.22.608849"],"is_preprint":true}],"current_model":"DSG3 encodes a desmosomal cadherin whose properly folded extracellular domain mediates Ca²⁺-dependent cell-cell adhesion; its intracytoplasmic cadherin-like subdomain directly binds plakoglobin, anchoring desmosomes to intermediate filaments, while an extradesmosomal pool associates with E-cadherin, β-catenin, and Src in an actin-linked complex that controls desmosome maturation and downstream signaling (including EGFR/ERK, p38 MAPK, and Akt/GSK3β/β-catenin pathways); pathogenic pemphigus vulgaris autoantibodies against Dsg3 trigger epitope-specific intracellular signaling cascades and endocytic removal of Dsg3 from desmosomes, progressively depleting the cytoskeletal Dsg3 pool and collapsing cell adhesion, a process also linked to ER stress activation."},"narrative":{"teleology":[{"year":1994,"claim":"Identifying the molecular target of pemphigus vulgaris pathogenesis: the properly folded Dsg3 extracellular domain was shown to carry all conformational epitopes required for pathogenic autoantibody binding and blister induction, establishing Dsg3 as the critical disease autoantigen.","evidence":"Recombinant Dsg3 ectodomain (baculovirus/COS7) immunoadsorbed pathogenic IgG and prevented blistering in neonatal mouse passive-transfer model","pmids":["8040292"],"confidence":"High","gaps":["Epitope fine-mapping not resolved","Whether Dsg3 antibodies alone are sufficient for mucosal PV or require anti-Dsg1 synergy not addressed"]},{"year":1995,"claim":"Defining how Dsg3 connects to the desmosomal plaque: the C-terminal 87 amino acids of the intracytoplasmic cadherin-like subdomain directly bind plakoglobin, while the desmoglein-specific repeat domains are dispensable, establishing the minimal plakoglobin-binding interface.","evidence":"Chimeric E-cadherin/Dsg3 constructs tested by co-IP in HaCaT cells and cell-free in vitro transcription/translation binding","pmids":["7738346"],"confidence":"High","gaps":["Structural basis of the Dsg3–plakoglobin interface not resolved","Whether other desmosomal plaque proteins bind the same subdomain not tested"]},{"year":1996,"claim":"Establishing that ER transit is required for Dsg3 conformational maturation: proper folding of Dsg3 requires signal-peptide-directed ER translocation, whereas prosequence cleavage and glycosylation are dispensable, clarifying quality-control steps for functional Dsg3 biosynthesis.","evidence":"Signal-peptide-deleted and protease-site-mutant baculovirus constructs assayed for immunoadsorption of PV sera","pmids":["8823357"],"confidence":"High","gaps":["ER chaperones involved not identified","Whether ER maturation defects contribute to disease in vivo not explored"]},{"year":1999,"claim":"Revealing the mechanism of autoantibody-induced adhesion loss: PV-IgG rapidly depletes Dsg3 from the detergent-soluble membrane pool, generating Dsg3-depleted desmosomes that initially retain other desmosomal components, with subsequent loss of the cytoskeletal Dsg3 pool, establishing a two-step depletion model.","evidence":"Sequential detergent fractionation and immunofluorescence in DJM-1 squamous carcinoma cells treated with PV-IgG","pmids":["9886266"],"confidence":"High","gaps":["Endocytic route of internalized Dsg3 not characterized","Signaling events driving depletion not defined"]},{"year":2007,"claim":"Demonstrating that polyclonal antibody diversity drives PV pathogenesis: individual monoclonal anti-Dsg3 antibodies each deplete Dsg3 to characteristic limits and act synergistically in combination, explaining why polyclonal PV-IgG is more pathogenic than individual specificities.","evidence":"Four monoclonal antibodies tested singly and in combination on DJM-1 cells and normal keratinocytes with dispase adhesion assay and fractionation","pmids":["17428808"],"confidence":"High","gaps":["Which epitope combinations are most pathogenic in vivo not determined","Role of antibody valence/isotype not dissected"]},{"year":2010,"claim":"Ordering the cellular events of Dsg3 loss into three phases: rapid internalization of non-junctional Dsg3, retrograde transport from cell contacts into cytoplasmic vesicles, and final depletion of the cytoskeletal pool; exogenous Dsg3 expression rescues adhesion by restoring biosynthetic supply.","evidence":"Live and fixed imaging of primary keratinocytes with PV-IgG, biochemical fractionation, and Dsg3 overexpression rescue","pmids":["21160493"],"confidence":"High","gaps":["Molecular machinery mediating retrograde transport not identified","Whether endocytic route involves clathrin or caveolae not resolved"]},{"year":2013,"claim":"Uncovering a signaling function for Dsg3 beyond adhesion: Dsg3 sequesters plakoglobin at the membrane, preventing its nuclear translocation and TCF/LEF-dependent transcription of c-Myc, cyclin D1, and MMP-7, thereby linking Dsg3 levels to cell cycle control and invasive behavior in cancer.","evidence":"RNAi knockdown of DSG3 in head-and-neck cancer cells with co-IP, TCF/LEF reporter, cell cycle analysis, and in vivo xenograft","pmids":["23737966"],"confidence":"High","gaps":["Whether this signaling axis operates in normal keratinocytes not tested","Direct versus indirect control of plakoglobin nuclear entry not resolved"]},{"year":2015,"claim":"Identifying an extradesmosomal Dsg3 signaling complex: Dsg3 forms a complex with E-cadherin, β-catenin, and Src outside desmosomes; Src phosphorylates Dsg3 and E-cadherin and is required for Dsg3 recruitment to the cytoskeletal pool and for desmosome hyper-adhesion, establishing Src as a key regulatory kinase of Dsg3 function.","evidence":"Reciprocal co-IP, Src inhibition, E-cadherin silencing, detergent fractionation, and tyrosine phosphorylation assays in primary keratinocytes","pmids":["26115704"],"confidence":"High","gaps":["Direct Src phosphorylation sites on Dsg3 not mapped","Structural basis of the E-cadherin/Dsg3 interaction not determined"]},{"year":2019,"claim":"Establishing Dsg3 isoform specificity in PV signaling: CRISPR knockout of Dsg3, but not Dsg2, protects keratinocytes from PV-IgG-induced loss of adhesion and prevents downstream Src-dependent EGFR and ERK activation, positioning Dsg3 as the obligate initiating sensor of pathogenic antibody signaling.","evidence":"CRISPR/Cas9 Dsg3 and Dsg2 KO in HaCaT cells with dispase assay, Ca²⁺ influx, and phospho-Western blots","pmids":["31178865"],"confidence":"High","gaps":["Whether compensatory upregulation of other desmogleins occurs in KO cells not fully addressed","Mechanism by which Dsg3 activates Src upon antibody binding not resolved"]},{"year":2021,"claim":"Connecting mechanical forces to Dsg3-mediated signaling: external mechanical stress counteracts anti-Dsg3 antibody-induced monolayer fragmentation by activating RhoA, strengthening cortical actin, and suppressing p38 MAPK phosphorylation, revealing mechano-signaling crosstalk downstream of Dsg3.","evidence":"Mechanical stress applied to keratinocyte monolayers with fragmentation assay, p38 MAPK and RhoA activity measurements","pmids":["33724731"],"confidence":"Medium","gaps":["Mechanosensor coupling Dsg3 to RhoA not identified","Genetic validation of p38 MAPK requirement not performed"]},{"year":2023,"claim":"Resolving epitope-specific signaling hierarchies: EC1-targeting antibody AK23 activates p38MAPK, Akt, and Src and depletes Dsg3, whereas EC5-targeting 2G4 activates p38MAPK and Akt but not Src and does not deplete Dsg3; pharmacological epistasis places p38MAPK upstream of Src and Akt, establishing that antibody epitope position dictates distinct intracellular signaling cascades.","evidence":"Multiple monoclonal antibodies with dispase assay, STED microscopy, GTPase GLISA, pharmacological inhibition of p38 and Src","pmids":["37143675"],"confidence":"High","gaps":["How epitope position transmits distinct conformational signals across the membrane not determined","Whether these hierarchies apply to polyclonal patient sera in vivo not tested"]},{"year":2023,"claim":"Demonstrating two mechanistically distinct Dsg3 adhesion pools: a cell-surface pool whose binding depends on actin filaments and a cell-contact pool whose adhesion is actin-independent but regulated by PKCα-controlled intermediate filament anchorage, resolving how different cytoskeletal systems differentially support Dsg3 function.","evidence":"Hybrid STED/single-molecule force spectroscopy AFM on living keratinocytes with Latrunculin B and PMA treatments","pmids":["36602635"],"confidence":"High","gaps":["Adaptor proteins linking each pool to its respective cytoskeleton not identified","Whether PV-IgG preferentially targets one pool not tested"]},{"year":2023,"claim":"Establishing in vivo genetic requirement: homozygous loss-of-function deletion of DSG3 causes acantholytic blistering of oral and laryngeal mucosa (ABOLM) in humans, proving Dsg3 is non-redundantly required for mucosal epithelial integrity.","evidence":"Chromosomal microarray in dizygotic twins with ABOLM phenotype; autoimmune mechanism excluded","pmids":["37850634"],"confidence":"Medium","gaps":["No functional rescue or cell biology performed","Genotype-phenotype correlation across different DSG3 mutations not established"]},{"year":2025,"claim":"Extending Dsg3 signaling to Wnt/β-catenin in cancer: STAT3 transcriptionally activates DSG3, which then promotes AKT phosphorylation, inhibits GSK3β, and drives β-catenin nuclear translocation to upregulate SOX2 and MMP7, enhancing stemness and metastasis in bladder cancer.","evidence":"DSG3 knockdown in bladder cancer cells with Western blot pathway analysis, in vivo xenograft, and lung metastasis model","pmids":["40605005"],"confidence":"Medium","gaps":["Independent replication in other cancer types lacking","Direct mechanism by which Dsg3 activates AKT not defined","Whether this pathway operates in normal urothelium not addressed"]},{"year":null,"claim":"Key unresolved questions include: the structural basis of how antibody binding to distinct Dsg3 extracellular domains transmits conformational changes across the membrane to activate specific intracellular kinase cascades; the identity of the endocytic machinery and trafficking adaptors mediating Dsg3 internalization and retrograde transport; and whether the extradesmosomal Dsg3/E-cadherin/Src complex is a regulated signaling platform or a transient biosynthetic intermediate.","evidence":"Open questions synthesized from gaps in the current literature","pmids":[],"confidence":"Low","gaps":["No structural model of full-length Dsg3 exists","Endocytic route (clathrin vs. caveolae) unresolved","Stoichiometry and regulation of the extradesmosomal complex unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098631","term_label":"cell adhesion mediator activity","supporting_discovery_ids":[0,5,12,13]},{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[9,11]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[6,7]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[3,5,7,12]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[5]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[3,12]}],"pathway":[{"term_id":"R-HSA-1500931","term_label":"Cell-Cell communication","supporting_discovery_ids":[1,7,12,13]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[6,9,11,14]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[0,4,11]}],"complexes":["desmosome","extradesmosomal E-cadherin/Dsg3/β-catenin/Src complex"],"partners":["JUP","CDH1","CTNNB1","SRC","CAV1","DSG1"],"other_free_text":[]},"mechanistic_narrative":"DSG3 encodes desmoglein-3, a desmosomal cadherin essential for Ca²⁺-dependent cell–cell adhesion in stratified mucosal epithelia, where it anchors desmosomes to the cytoskeleton and transduces signals that regulate adhesion strength, cell proliferation, and migration. The extracellular domain mediates homophilic adhesion and is the target of pathogenic pemphigus vulgaris autoantibodies [PMID:8040292], while the intracytoplasmic cadherin-like subdomain directly binds plakoglobin to link desmosomes to intermediate filaments [PMID:7738346]; an extradesmosomal pool associates with E-cadherin, β-catenin, and Src to regulate desmosome maturation and downstream Src/EGFR/ERK, p38 MAPK, and Akt/GSK3β/β-catenin signaling [PMID:26115704, PMID:31178865, PMID:37143675]. Homozygous loss-of-function deletion of DSG3 causes acantholytic blistering of oral and laryngeal mucosa, confirming its non-redundant requirement for mucosal epithelial integrity in humans [PMID:37850634]."},"prefetch_data":{"uniprot":{"accession":"P32926","full_name":"Desmoglein-3","aliases":["130 kDa pemphigus vulgaris antigen","PVA","Cadherin family member 6"],"length_aa":999,"mass_kda":107.5,"function":"A component of desmosome cell-cell junctions which are required for positive regulation of cellular adhesion (PubMed:31835537). Required for adherens and desmosome junction assembly in response to mechanical force in keratinocytes (PubMed:31835537). Required for desmosome-mediated cell-cell adhesion of cells surrounding the telogen hair club and the basal layer of the outer root sheath epithelium, consequently is essential for the anchoring of telogen hairs in the hair follicle (PubMed:9701552). Required for the maintenance of the epithelial barrier via promoting desmosome-mediated intercellular attachment of suprabasal epithelium to basal cells (By similarity). May play a role in the protein stability of the desmosome plaque components DSP, JUP, PKP1, PKP2 and PKP3 (PubMed:22294297). Required for YAP1 localization at the plasma membrane in keratinocytes in response to mechanical strain, via the formation of an interaction complex composed of DSG3, PKP1 and YWHAG (PubMed:31835537). May also be involved in the positive regulation of YAP1 target gene transcription and as a result cell proliferation (PubMed:31835537). Positively regulates cellular contractility and cell junction formation via organization of cortical F-actin bundles and anchoring of actin to tight junctions, in conjunction with RAC1 (PubMed:22796473). The cytoplasmic pool of DSG3 is required for the localization of CDH1 and CTNNB1 at developing adherens junctions, potentially via modulation of SRC activity (PubMed:22294297). Inhibits keratinocyte migration via suppression of p38MAPK signaling, may therefore play a role in moderating wound healing (PubMed:26763450)","subcellular_location":"Cell membrane; Cell junction, desmosome; Cytoplasm; Cell junction, tight junction; Cell junction","url":"https://www.uniprot.org/uniprotkb/P32926/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/DSG3","classification":"Not Classified","n_dependent_lines":1,"n_total_lines":1208,"dependency_fraction":0.0008278145695364238},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/DSG3","total_profiled":1310},"omim":[{"mim_id":"619226","title":"BLISTERING, ACANTHOLYTIC, OF ORAL AND LARYNGEAL MUCOSA; ABOLM","url":"https://www.omim.org/entry/619226"},{"mim_id":"607903","title":"HYPOTRICHOSIS 6; HYPT6","url":"https://www.omim.org/entry/607903"},{"mim_id":"607892","title":"DESMOGLEIN 4; DSG4","url":"https://www.omim.org/entry/607892"},{"mim_id":"605116","title":"CHOLINERGIC RECEPTOR, NEURONAL NICOTINIC, ALPHA POLYPEPTIDE 9; CHRNA9","url":"https://www.omim.org/entry/605116"},{"mim_id":"169615","title":"DESMOGLEIN 3; DSG3","url":"https://www.omim.org/entry/169615"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"cervix","ntpm":93.0},{"tissue":"esophagus","ntpm":296.1},{"tissue":"vagina","ntpm":115.5}],"url":"https://www.proteinatlas.org/search/DSG3"},"hgnc":{"alias_symbol":["CDHF6"],"prev_symbol":[]},"alphafold":{"accession":"P32926","domains":[{"cath_id":"2.60.40.60","chopping":"54-149","consensus_level":"high","plddt":92.653,"start":54,"end":149},{"cath_id":"2.60.40.60","chopping":"157-259","consensus_level":"medium","plddt":95.008,"start":157,"end":259},{"cath_id":"2.60.40.60","chopping":"267-376","consensus_level":"medium","plddt":94.961,"start":267,"end":376},{"cath_id":"2.60.40.60","chopping":"382-485","consensus_level":"high","plddt":86.4858,"start":382,"end":485},{"cath_id":"2.60.40.60","chopping":"495-596","consensus_level":"high","plddt":76.5641,"start":495,"end":596}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P32926","model_url":"https://alphafold.ebi.ac.uk/files/AF-P32926-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P32926-F1-predicted_aligned_error_v6.png","plddt_mean":65.31},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=DSG3","jax_strain_url":"https://www.jax.org/strain/search?query=DSG3"},"sequence":{"accession":"P32926","fasta_url":"https://rest.uniprot.org/uniprotkb/P32926.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P32926/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P32926"}},"corpus_meta":[{"pmid":"8040292","id":"PMC_8040292","title":"Absorption of pathogenic autoantibodies by the extracellular domain of pemphigus vulgaris antigen (Dsg3) produced by baculovirus.","date":"1994","source":"The Journal of clinical investigation","url":"https://pubmed.ncbi.nlm.nih.gov/8040292","citation_count":272,"is_preprint":false},{"pmid":"9886266","id":"PMC_9886266","title":"Pemphigus vulgaris-IgG causes a rapid depletion of desmoglein 3 (Dsg3) from the Triton X-100 soluble pools, leading to the formation of Dsg3-depleted desmosomes in a human squamous carcinoma cell line, DJM-1 cells.","date":"1999","source":"The Journal of investigative dermatology","url":"https://pubmed.ncbi.nlm.nih.gov/9886266","citation_count":124,"is_preprint":false},{"pmid":"16878157","id":"PMC_16878157","title":"DSG3 is overexpressed in head neck cancer and is a potential molecular target for inhibition of oncogenesis.","date":"2006","source":"Oncogene","url":"https://pubmed.ncbi.nlm.nih.gov/16878157","citation_count":103,"is_preprint":false},{"pmid":"17428808","id":"PMC_17428808","title":"Anti-desmoglein 3 (Dsg3) monoclonal antibodies deplete desmosomes of Dsg3 and differ in their Dsg3-depleting activities related to pathogenicity.","date":"2007","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/17428808","citation_count":73,"is_preprint":false},{"pmid":"21160493","id":"PMC_21160493","title":"Desmosome disassembly in response to pemphigus vulgaris IgG occurs in distinct phases and can be reversed by expression of exogenous Dsg3.","date":"2010","source":"The Journal of investigative dermatology","url":"https://pubmed.ncbi.nlm.nih.gov/21160493","citation_count":69,"is_preprint":false},{"pmid":"23737966","id":"PMC_23737966","title":"DSG3 facilitates cancer cell growth and invasion through the DSG3-plakoglobin-TCF/LEF-Myc/cyclin D1/MMP signaling pathway.","date":"2013","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/23737966","citation_count":61,"is_preprint":false},{"pmid":"26115704","id":"PMC_26115704","title":"E-cadherin and Src associate with extradesmosomal Dsg3 and modulate desmosome assembly and adhesion.","date":"2015","source":"Cellular and molecular life sciences : CMLS","url":"https://pubmed.ncbi.nlm.nih.gov/26115704","citation_count":57,"is_preprint":false},{"pmid":"7706774","id":"PMC_7706774","title":"A case of pemphigus vulgaris showing reactivity with pemphigus antigens (Dsg1 and Dsg3) and desmocollins.","date":"1995","source":"The Journal of investigative dermatology","url":"https://pubmed.ncbi.nlm.nih.gov/7706774","citation_count":50,"is_preprint":false},{"pmid":"7738346","id":"PMC_7738346","title":"Plakoglobin binding by human Dsg3 (pemphigus vulgaris antigen) in keratinocytes requires the cadherin-like intracytoplasmic segment.","date":"1995","source":"The Journal of investigative dermatology","url":"https://pubmed.ncbi.nlm.nih.gov/7738346","citation_count":42,"is_preprint":false},{"pmid":"1601426","id":"PMC_1601426","title":"The human gene (DSG3) coding for the pemphigus vulgaris antigen is, like the genes coding for the other two known desmogleins, assigned to chromosome 18.","date":"1992","source":"Human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/1601426","citation_count":38,"is_preprint":false},{"pmid":"31178865","id":"PMC_31178865","title":"Role of Dsg1- and Dsg3-Mediated Signaling in Pemphigus Autoantibody-Induced Loss of Keratinocyte Cohesion.","date":"2019","source":"Frontiers in immunology","url":"https://pubmed.ncbi.nlm.nih.gov/31178865","citation_count":34,"is_preprint":false},{"pmid":"16015083","id":"PMC_16015083","title":"Altered expression of CLC, DSG3, EMP3, S100A2, and SLPI in corneal epithelium from keratoconus patients.","date":"2005","source":"Cornea","url":"https://pubmed.ncbi.nlm.nih.gov/16015083","citation_count":31,"is_preprint":false},{"pmid":"23010602","id":"PMC_23010602","title":"DSG3 as a biomarker for the ultrasensitive detection of occult lymph node metastasis in oral cancer using nanostructured immunoarrays.","date":"2012","source":"Oral oncology","url":"https://pubmed.ncbi.nlm.nih.gov/23010602","citation_count":30,"is_preprint":false},{"pmid":"8034325","id":"PMC_8034325","title":"The human genes for desmogleins (DSG1 and DSG3) are located in a small region on chromosome 18q12.","date":"1994","source":"Genomics","url":"https://pubmed.ncbi.nlm.nih.gov/8034325","citation_count":29,"is_preprint":false},{"pmid":"25695683","id":"PMC_25695683","title":"Mucosal pemphigus vulgaris anti-Dsg3 IgG is pathogenic to the oral mucosa of humanized Dsg3 mice.","date":"2015","source":"The Journal of investigative 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immunology","url":"https://pubmed.ncbi.nlm.nih.gov/37143675","citation_count":16,"is_preprint":false},{"pmid":"30510564","id":"PMC_30510564","title":"Sequence Characterization of DSG3 Gene to Know Its Role in High-Altitude Hypoxia Adaptation in the Chinese Cashmere Goat.","date":"2018","source":"Frontiers in genetics","url":"https://pubmed.ncbi.nlm.nih.gov/30510564","citation_count":14,"is_preprint":false},{"pmid":"35711465","id":"PMC_35711465","title":"Dsg1 and Dsg3 Composition of Desmosomes Across Human Epidermis and Alterations in Pemphigus Vulgaris Patient Skin.","date":"2022","source":"Frontiers in immunology","url":"https://pubmed.ncbi.nlm.nih.gov/35711465","citation_count":13,"is_preprint":false},{"pmid":"33724731","id":"PMC_33724731","title":"Modulation of Mechanical Stress Mitigates Anti-Dsg3 Antibody-Induced Dissociation of Cell-Cell Adhesion.","date":"2021","source":"Advanced biology","url":"https://pubmed.ncbi.nlm.nih.gov/33724731","citation_count":13,"is_preprint":false},{"pmid":"36375372","id":"PMC_36375372","title":"Desmoglein 3 (Dsg3) expression in cancer: A tissue microarray study on 15,869 tumors.","date":"2022","source":"Pathology, research and practice","url":"https://pubmed.ncbi.nlm.nih.gov/36375372","citation_count":13,"is_preprint":false},{"pmid":"29749496","id":"PMC_29749496","title":"Increased expression of microRNA-338-3p contributes to production of Dsg3 antibody in pemphigus vulgaris patients.","date":"2018","source":"Molecular medicine reports","url":"https://pubmed.ncbi.nlm.nih.gov/29749496","citation_count":13,"is_preprint":false},{"pmid":"36689824","id":"PMC_36689824","title":"Deregulated phenotype of autoreactive Th17 and Treg clone cells in pemphigus vulgaris after in-vitro treatment with desmoglein antigen (Dsg-3).","date":"2023","source":"Immunobiology","url":"https://pubmed.ncbi.nlm.nih.gov/36689824","citation_count":13,"is_preprint":false},{"pmid":"8823357","id":"PMC_8823357","title":"Transport to endoplasmic reticulum by signal peptide, but not proteolytic processing, is required for formation of conformational epitopes of pemphigus vulgaris antigen (Dsg3).","date":"1996","source":"The Journal of investigative dermatology","url":"https://pubmed.ncbi.nlm.nih.gov/8823357","citation_count":12,"is_preprint":false},{"pmid":"36602635","id":"PMC_36602635","title":"Cytoskeletal anchorage of different Dsg3 pools revealed by combination of hybrid STED/SMFS-AFM.","date":"2023","source":"Cellular and molecular life sciences : CMLS","url":"https://pubmed.ncbi.nlm.nih.gov/36602635","citation_count":10,"is_preprint":false},{"pmid":"18586466","id":"PMC_18586466","title":"Genetic characterization of human Dsg3-specific B cells isolated by flow cytometry from the peripheral blood of patients with pemphigus vulgaris.","date":"2008","source":"Journal of dermatological science","url":"https://pubmed.ncbi.nlm.nih.gov/18586466","citation_count":7,"is_preprint":false},{"pmid":"19200441","id":"PMC_19200441","title":"High-dose pemphigus antibodies against linear epitopes of desmoglein 3 (Dsg3) can induce acantholysis and depletion of Dsg3 from keratinocytes.","date":"2009","source":"Immunology letters","url":"https://pubmed.ncbi.nlm.nih.gov/19200441","citation_count":5,"is_preprint":false},{"pmid":"26858977","id":"PMC_26858977","title":"Evidence for Dsg3 in regulating Src signaling by competing with it for binding to caveolin-1.","date":"2015","source":"Data in brief","url":"https://pubmed.ncbi.nlm.nih.gov/26858977","citation_count":5,"is_preprint":false},{"pmid":"35251162","id":"PMC_35251162","title":"Characterization of Desmoglein 3 (DSG3) as a Sensitive and Specific Marker for Esophageal Squamous Cell Carcinoma.","date":"2022","source":"Gastroenterology research and practice","url":"https://pubmed.ncbi.nlm.nih.gov/35251162","citation_count":3,"is_preprint":false},{"pmid":"40605005","id":"PMC_40605005","title":"DSG3 promotes bladder cancer growth and metastasis via AKT/GSK3β/β-catenin pathway.","date":"2025","source":"Journal of translational medicine","url":"https://pubmed.ncbi.nlm.nih.gov/40605005","citation_count":2,"is_preprint":false},{"pmid":"40558105","id":"PMC_40558105","title":"Circulating Antibodies Against DSG1 and DSG3 in Patients with Oral Lichen Planus: A Scoping Review.","date":"2025","source":"Antibodies (Basel, Switzerland)","url":"https://pubmed.ncbi.nlm.nih.gov/40558105","citation_count":1,"is_preprint":false},{"pmid":"37850634","id":"PMC_37850634","title":"Homozygous deletion of the DSG3 terminal exon associated with acantholytic blistering of the oral and laryngeal mucosa.","date":"2023","source":"American journal of medical genetics. Part A","url":"https://pubmed.ncbi.nlm.nih.gov/37850634","citation_count":1,"is_preprint":false},{"pmid":"41676306","id":"PMC_41676306","title":"Dihydroartemisinin attenuates pemphigus vulgaris by regulating Dsg3 and the TLR9/NF-κB pathway.","date":"2026","source":"American journal of translational research","url":"https://pubmed.ncbi.nlm.nih.gov/41676306","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2025.08.06.25333158","title":"Vector-derived Cadherin Mimicry in Pemphigus Vulgaris: A Proposed Model Linking HLA-DRB1*04:02/14:01 Genotype with Environmental Exposure","date":"2025-08-08","source":"bioRxiv","url":"https://doi.org/10.1101/2025.08.06.25333158","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.02.10.637416","title":"In pemphigus, cell detachment, but not autoantibody binding, induces cell-wide, long-lasting transcriptomic and proteomic changes","date":"2025-02-12","source":"bioRxiv","url":"https://doi.org/10.1101/2025.02.10.637416","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2024.08.22.608849","title":"Pemphigus vulgaris autoantibodies induce an ER stress response","date":"2024-08-23","source":"bioRxiv","url":"https://doi.org/10.1101/2024.08.22.608849","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":20675,"output_tokens":4467,"usd":0.064515},"stage2":{"model":"claude-opus-4-6","input_tokens":7967,"output_tokens":3883,"usd":0.205365},"total_usd":0.26988,"stage1_batch_id":"msgbatch_0118RScg3WGaGkaZRtWZbtce","stage2_batch_id":"msgbatch_01Cpfzvtbj42aqp5oYZ5Te2s","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1994,\n      \"finding\": \"The extracellular domain of Dsg3 (produced in eukaryotic baculovirus/COS7 cells) carries conformational epitopes recognized by pathogenic pemphigus vulgaris autoantibodies; this properly folded recombinant domain absorbs pathogenic IgG and prevents blister formation in a neonatal mouse passive-transfer model, establishing the extracellular domain as the target of pathogenic autoantibodies.\",\n      \"method\": \"Baculovirus/COS7 recombinant protein production, immunoadsorption of patient sera, neonatal mouse passive-transfer blister model\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — in vitro functional assay combined with in vivo passive-transfer model; foundational paper with >270 citations\",\n      \"pmids\": [\"8040292\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"Dsg3 binds plakoglobin directly through the carboxy-terminal 87 amino acids of its intracytoplasmic cadherin-like subdomain; the desmoglein-specific intracytoplasmic subdomains are dispensable for this interaction, demonstrated both by co-immunoprecipitation of chimeric constructs in HaCaT cells and by cell-free in vitro transcription/translation.\",\n      \"method\": \"Chimeric E-cadherin/Dsg3 expression constructs, co-immunoprecipitation in HaCaT keratinocytes, in vitro transcription/translation binding assay\",\n      \"journal\": \"The Journal of investigative dermatology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct binding confirmed both in-cell co-IP and cell-free in vitro reconstitution; two orthogonal methods in same study\",\n      \"pmids\": [\"7738346\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"Proper conformational epitope formation of Dsg3 requires transport through the endoplasmic reticulum (signal peptide-dependent); proteolytic processing of the prosequence and glycosylation are dispensable, but cytosolic accumulation (absence of signal peptide) abolishes conformational epitope formation.\",\n      \"method\": \"Baculovirus expression of signal-peptide-deleted and protease-cleavage-site-mutant Dsg3 constructs; immunoadsorption activity assay with PV patient sera\",\n      \"journal\": \"The Journal of investigative dermatology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — mutagenesis combined with functional immunoadsorption assay; multiple mutant constructs tested\",\n      \"pmids\": [\"8823357\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"PV-IgG binding to surface Dsg3 rapidly depletes Dsg3 from the detergent-soluble membrane pool within 20 minutes, subsequently forming Dsg3-depleted desmosomes that retain Dsg1, desmoplakin, plakoglobin, and keratin filaments; prolonged exposure causes loss of Dsg3 from the cytoskeletal (detergent-insoluble) pool as well.\",\n      \"method\": \"Sequential detergent fractionation (PBS-soluble / Triton X-100-soluble / Triton X-100-insoluble), immunoblotting, double immunofluorescence microscopy in DJM-1 human squamous carcinoma cells\",\n      \"journal\": \"The Journal of investigative dermatology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal fractionation and imaging; replicated with monoclonal antibodies in follow-up study (PMID 17428808)\",\n      \"pmids\": [\"9886266\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Monoclonal anti-Dsg3 antibodies deplete Dsg3 from desmosomes in a manner that correlates with their pathogenic activity; individual antibodies show characteristic depletion limits and combinations exert cumulative/synergistic depletion, indicating that polyclonal PV-IgG pathogenicity arises from antibody diversity against multiple Dsg3 epitopes.\",\n      \"method\": \"Monoclonal antibody treatment of DJM-1 cells and normal human keratinocytes, detergent fractionation, immunofluorescence, dispase-based adhesion strength assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — four different monoclonal antibodies tested with orthogonal readouts; mechanistic extension of prior fractionation findings\",\n      \"pmids\": [\"17428808\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"PV IgG causes Dsg3 loss of cell adhesion through three sequential phases: (1) rapid internalization of non-junctional Dsg3, (2) retrograde transport of surface Dsg3 complexes along linear arrays perpendicular to cell contacts into cytoplasmic vesicles, and (3) depletion of detergent-insoluble Dsg3 and loss of adhesion strength; expressing exogenous Dsg3 prevents disassembly by driving biosynthesis and desmosome reassembly.\",\n      \"method\": \"Live and fixed immunofluorescence microscopy of primary human keratinocytes, biochemical fractionation, exogenous Dsg3 overexpression rescue experiment, PV patient IgG treatment\",\n      \"journal\": \"The Journal of investigative dermatology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (live imaging, fractionation, rescue experiment) establishing ordered pathway in a single study\",\n      \"pmids\": [\"21160493\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"DSG3 retains plakoglobin at the cell membrane/cytoplasm; DSG3 silencing disrupts the DSG3–plakoglobin interaction, triggers plakoglobin nuclear translocation, increases plakoglobin–TCF interaction, and suppresses TCF/LEF transcriptional activity, reducing downstream c-Myc, cyclin D1, and MMP-7 expression, thereby promoting G0/G1 arrest and reducing migration/invasion in head and neck cancer cells.\",\n      \"method\": \"RNA interference knockdown, co-immunoprecipitation, immunofluorescence, TCF/LEF luciferase reporter assay, Western blot, flow cytometry (cell cycle), in vitro migration/invasion assays, xenograft tumor model\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (co-IP, reporter assay, KD phenotype, in vivo xenograft) in a single study establishing a defined signaling pathway\",\n      \"pmids\": [\"23737966\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Extradesmosomal Dsg3 forms a complex with E-cadherin, β-catenin, and Src; Src activity regulates the stability of this complex, phosphorylates both Dsg3 and E-cadherin on tyrosine residues, and is required for recruiting Dsg3 to the cytoskeletal pool and for desmosome maturation to a Ca²⁺-insensitive (hyper-adhesive) state.\",\n      \"method\": \"Co-immunoprecipitation, E-cadherin overexpression and silencing, Src inhibitor treatment, immunofluorescence, detergent fractionation, tyrosine phosphorylation assays, p38 MAPK activation measurement in primary keratinocytes\",\n      \"journal\": \"Cellular and molecular life sciences : CMLS\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal co-IP identifying the complex plus multiple functional loss-of-function experiments with defined molecular readouts\",\n      \"pmids\": [\"26115704\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Dsg3 competes with inactive Src for binding to caveolin-1 (Cav-1) in a non-ionic detergent-soluble pool; elevated Dsg3 levels reduce Cav-1/Src co-localization, suggesting Dsg3 activates Src by displacing it from Cav-1-mediated inhibition. A caveolin-1 scaffolding domain binding region was identified in the Dsg3 carboxyl terminus.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence co-localization, Dsg3 overexpression, sequence/domain analysis\",\n      \"journal\": \"Data in brief\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single co-IP plus immunofluorescence; no direct binding reconstitution or mutagenesis validation\",\n      \"pmids\": [\"26858977\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Dsg3 is specifically required for PV-IgG-induced loss of keratinocyte adhesion: CRISPR/Cas9-generated Dsg3-deficient HaCaT cells are protected against PV-IgG-induced loss of cell adhesion, Src-dependent EGFR activation, and Src-dependent ERK activation, whereas Dsg2-deficient cells are not protected.\",\n      \"method\": \"CRISPR/Cas9 knockout of Dsg3 and Dsg2 in HaCaT keratinocytes, dispase dissociation assay, Ca²⁺ influx measurements, EGFR inhibitor treatment, Western blot for Src/ERK/p38 phosphorylation\",\n      \"journal\": \"Frontiers in immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO with specific phenotypic rescue establishing pathway position; isogenic controls distinguish Dsg isoform specificity\",\n      \"pmids\": [\"31178865\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Anti-Dsg3 antibody-induced cell-cell dissociation involves p38 MAPK phosphorylation; externally applied mechanical stress mitigates antibody-induced monolayer fragmentation by activating RhoA and strengthening cortical actin, and also inhibits p38 MAPK phosphorylation induced by anti-Dsg3 antibody.\",\n      \"method\": \"Mechanical stress application to keratinocyte monolayers, monolayer fragmentation assay, Western blot for p38 MAPK phosphorylation, RhoA activity assay, actin imaging\",\n      \"journal\": \"Advanced biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — defined signaling readout (p38, RhoA) with functional phenotype, but single study with no genetic validation of p38 in this context\",\n      \"pmids\": [\"33724731\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Antibodies targeting different epitopes of Dsg3 trigger distinct signaling: the EC1-domain antibody AK23 induces Dsg3 depletion and activates p38MAPK, Akt, and Src, whereas the EC5-domain antibody 2G4 activates p38MAPK and Akt but not Src and does not deplete Dsg3; Src and Akt activation are p38MAPK-dependent, establishing an epitope-specific Dsg3 signaling hierarchy.\",\n      \"method\": \"Dispase dissociation assay, Western blot (p38, Src, Akt phosphorylation), STED super-resolution microscopy, Rho/Rac GTPase GLISA, Ca²⁺ flux measurements, pharmacological inhibition of p38MAPK and Src\",\n      \"journal\": \"Frontiers in immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — multiple orthogonal methods with pharmacological epistasis establishing a signaling hierarchy downstream of Dsg3 epitope engagement\",\n      \"pmids\": [\"37143675\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Dsg3 exists in two distinct pools on living keratinocytes with different cytoskeletal anchorage: a cell-surface pool whose adhesion is dependent on actin filaments (disrupted by Latrunculin B), and a cell-cell contact pool whose adhesion is actin-independent but regulated by PKCα-controlled intermediate filament anchorage.\",\n      \"method\": \"Hybrid STED/single-molecule force spectroscopy AFM (STED/SMFS-AFM) on living keratinocytes, Latrunculin B (actin disruption), PMA (PKCα activation), pharmacological dissection of cytoskeletal contributions\",\n      \"journal\": \"Cellular and molecular life sciences : CMLS\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — novel single-molecule force spectroscopy combined with super-resolution imaging on living cells; pharmacological dissection with two independent agents\",\n      \"pmids\": [\"36602635\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Homozygous loss-of-function deletion of the terminal exon of DSG3 causes acantholytic blistering of the oral and laryngeal mucosa (ABOLM), directly establishing that Dsg3 is required for mucosal epithelial adhesion integrity in vivo.\",\n      \"method\": \"Clinical genetics — homozygous deletion mapping by chromosomal microarray in dizygotic twins with ABOLM phenotype; exclusion of autoimmune mechanism\",\n      \"journal\": \"American journal of medical genetics. Part A\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — human loss-of-function genetics with defined phenotype establishing in vivo requirement; no functional cell studies performed\",\n      \"pmids\": [\"37850634\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"In bladder cancer cells, STAT3 transcriptionally activates DSG3 expression; DSG3 then promotes AKT phosphorylation, inhibits GSK3β, and drives β-catenin nuclear translocation, leading to transcriptional upregulation of SOX2 and MMP7 and thereby enhancing cancer stemness, EMT, migration, invasion, and metastasis.\",\n      \"method\": \"DSG3 knockdown in vitro and in vivo xenograft, Western blot (AKT, GSK3β, β-catenin, SOX2, MMP7), chromatin immunoprecipitation or reporter assay for STAT3 transcriptional activation, EMT and migration assays, mouse lung metastasis model\",\n      \"journal\": \"Journal of translational medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KD with defined pathway readouts and in vivo validation, but a single lab study without independent replication\",\n      \"pmids\": [\"40605005\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"PV autoantibodies targeting Dsg3 activate ER stress signaling pathways (IRE1α and PERK) in keratinocytes; ER tubules make frequent contacts with internalizing Dsg3 puncta, and pharmacological inhibition of ER stress protects against PV IgG-induced desmosome disruption and loss of keratinocyte cohesion.\",\n      \"method\": \"High-resolution time-lapse live imaging of ER–Dsg3 contacts, biochemical assays for IRE1α and PERK activation, pharmacological ER stress inhibition, dispase adhesion assay, transcriptomic analysis of PV patient skin\",\n      \"journal\": \"bioRxiv (preprint)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — live imaging plus biochemical pathway assay plus pharmacological rescue; not yet peer-reviewed\",\n      \"pmids\": [\"bio_10.1101_2024.08.22.608849\"],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"DSG3 encodes a desmosomal cadherin whose properly folded extracellular domain mediates Ca²⁺-dependent cell-cell adhesion; its intracytoplasmic cadherin-like subdomain directly binds plakoglobin, anchoring desmosomes to intermediate filaments, while an extradesmosomal pool associates with E-cadherin, β-catenin, and Src in an actin-linked complex that controls desmosome maturation and downstream signaling (including EGFR/ERK, p38 MAPK, and Akt/GSK3β/β-catenin pathways); pathogenic pemphigus vulgaris autoantibodies against Dsg3 trigger epitope-specific intracellular signaling cascades and endocytic removal of Dsg3 from desmosomes, progressively depleting the cytoskeletal Dsg3 pool and collapsing cell adhesion, a process also linked to ER stress activation.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"DSG3 encodes desmoglein-3, a desmosomal cadherin essential for Ca²⁺-dependent cell–cell adhesion in stratified mucosal epithelia, where it anchors desmosomes to the cytoskeleton and transduces signals that regulate adhesion strength, cell proliferation, and migration. The extracellular domain mediates homophilic adhesion and is the target of pathogenic pemphigus vulgaris autoantibodies [PMID:8040292], while the intracytoplasmic cadherin-like subdomain directly binds plakoglobin to link desmosomes to intermediate filaments [PMID:7738346]; an extradesmosomal pool associates with E-cadherin, β-catenin, and Src to regulate desmosome maturation and downstream Src/EGFR/ERK, p38 MAPK, and Akt/GSK3β/β-catenin signaling [PMID:26115704, PMID:31178865, PMID:37143675]. Homozygous loss-of-function deletion of DSG3 causes acantholytic blistering of oral and laryngeal mucosa, confirming its non-redundant requirement for mucosal epithelial integrity in humans [PMID:37850634].\",\n  \"teleology\": [\n    {\n      \"year\": 1994,\n      \"claim\": \"Identifying the molecular target of pemphigus vulgaris pathogenesis: the properly folded Dsg3 extracellular domain was shown to carry all conformational epitopes required for pathogenic autoantibody binding and blister induction, establishing Dsg3 as the critical disease autoantigen.\",\n      \"evidence\": \"Recombinant Dsg3 ectodomain (baculovirus/COS7) immunoadsorbed pathogenic IgG and prevented blistering in neonatal mouse passive-transfer model\",\n      \"pmids\": [\"8040292\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Epitope fine-mapping not resolved\", \"Whether Dsg3 antibodies alone are sufficient for mucosal PV or require anti-Dsg1 synergy not addressed\"]\n    },\n    {\n      \"year\": 1995,\n      \"claim\": \"Defining how Dsg3 connects to the desmosomal plaque: the C-terminal 87 amino acids of the intracytoplasmic cadherin-like subdomain directly bind plakoglobin, while the desmoglein-specific repeat domains are dispensable, establishing the minimal plakoglobin-binding interface.\",\n      \"evidence\": \"Chimeric E-cadherin/Dsg3 constructs tested by co-IP in HaCaT cells and cell-free in vitro transcription/translation binding\",\n      \"pmids\": [\"7738346\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of the Dsg3–plakoglobin interface not resolved\", \"Whether other desmosomal plaque proteins bind the same subdomain not tested\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Establishing that ER transit is required for Dsg3 conformational maturation: proper folding of Dsg3 requires signal-peptide-directed ER translocation, whereas prosequence cleavage and glycosylation are dispensable, clarifying quality-control steps for functional Dsg3 biosynthesis.\",\n      \"evidence\": \"Signal-peptide-deleted and protease-site-mutant baculovirus constructs assayed for immunoadsorption of PV sera\",\n      \"pmids\": [\"8823357\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"ER chaperones involved not identified\", \"Whether ER maturation defects contribute to disease in vivo not explored\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Revealing the mechanism of autoantibody-induced adhesion loss: PV-IgG rapidly depletes Dsg3 from the detergent-soluble membrane pool, generating Dsg3-depleted desmosomes that initially retain other desmosomal components, with subsequent loss of the cytoskeletal Dsg3 pool, establishing a two-step depletion model.\",\n      \"evidence\": \"Sequential detergent fractionation and immunofluorescence in DJM-1 squamous carcinoma cells treated with PV-IgG\",\n      \"pmids\": [\"9886266\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Endocytic route of internalized Dsg3 not characterized\", \"Signaling events driving depletion not defined\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Demonstrating that polyclonal antibody diversity drives PV pathogenesis: individual monoclonal anti-Dsg3 antibodies each deplete Dsg3 to characteristic limits and act synergistically in combination, explaining why polyclonal PV-IgG is more pathogenic than individual specificities.\",\n      \"evidence\": \"Four monoclonal antibodies tested singly and in combination on DJM-1 cells and normal keratinocytes with dispase adhesion assay and fractionation\",\n      \"pmids\": [\"17428808\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Which epitope combinations are most pathogenic in vivo not determined\", \"Role of antibody valence/isotype not dissected\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Ordering the cellular events of Dsg3 loss into three phases: rapid internalization of non-junctional Dsg3, retrograde transport from cell contacts into cytoplasmic vesicles, and final depletion of the cytoskeletal pool; exogenous Dsg3 expression rescues adhesion by restoring biosynthetic supply.\",\n      \"evidence\": \"Live and fixed imaging of primary keratinocytes with PV-IgG, biochemical fractionation, and Dsg3 overexpression rescue\",\n      \"pmids\": [\"21160493\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular machinery mediating retrograde transport not identified\", \"Whether endocytic route involves clathrin or caveolae not resolved\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Uncovering a signaling function for Dsg3 beyond adhesion: Dsg3 sequesters plakoglobin at the membrane, preventing its nuclear translocation and TCF/LEF-dependent transcription of c-Myc, cyclin D1, and MMP-7, thereby linking Dsg3 levels to cell cycle control and invasive behavior in cancer.\",\n      \"evidence\": \"RNAi knockdown of DSG3 in head-and-neck cancer cells with co-IP, TCF/LEF reporter, cell cycle analysis, and in vivo xenograft\",\n      \"pmids\": [\"23737966\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether this signaling axis operates in normal keratinocytes not tested\", \"Direct versus indirect control of plakoglobin nuclear entry not resolved\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Identifying an extradesmosomal Dsg3 signaling complex: Dsg3 forms a complex with E-cadherin, β-catenin, and Src outside desmosomes; Src phosphorylates Dsg3 and E-cadherin and is required for Dsg3 recruitment to the cytoskeletal pool and for desmosome hyper-adhesion, establishing Src as a key regulatory kinase of Dsg3 function.\",\n      \"evidence\": \"Reciprocal co-IP, Src inhibition, E-cadherin silencing, detergent fractionation, and tyrosine phosphorylation assays in primary keratinocytes\",\n      \"pmids\": [\"26115704\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct Src phosphorylation sites on Dsg3 not mapped\", \"Structural basis of the E-cadherin/Dsg3 interaction not determined\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Establishing Dsg3 isoform specificity in PV signaling: CRISPR knockout of Dsg3, but not Dsg2, protects keratinocytes from PV-IgG-induced loss of adhesion and prevents downstream Src-dependent EGFR and ERK activation, positioning Dsg3 as the obligate initiating sensor of pathogenic antibody signaling.\",\n      \"evidence\": \"CRISPR/Cas9 Dsg3 and Dsg2 KO in HaCaT cells with dispase assay, Ca²⁺ influx, and phospho-Western blots\",\n      \"pmids\": [\"31178865\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether compensatory upregulation of other desmogleins occurs in KO cells not fully addressed\", \"Mechanism by which Dsg3 activates Src upon antibody binding not resolved\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Connecting mechanical forces to Dsg3-mediated signaling: external mechanical stress counteracts anti-Dsg3 antibody-induced monolayer fragmentation by activating RhoA, strengthening cortical actin, and suppressing p38 MAPK phosphorylation, revealing mechano-signaling crosstalk downstream of Dsg3.\",\n      \"evidence\": \"Mechanical stress applied to keratinocyte monolayers with fragmentation assay, p38 MAPK and RhoA activity measurements\",\n      \"pmids\": [\"33724731\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanosensor coupling Dsg3 to RhoA not identified\", \"Genetic validation of p38 MAPK requirement not performed\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Resolving epitope-specific signaling hierarchies: EC1-targeting antibody AK23 activates p38MAPK, Akt, and Src and depletes Dsg3, whereas EC5-targeting 2G4 activates p38MAPK and Akt but not Src and does not deplete Dsg3; pharmacological epistasis places p38MAPK upstream of Src and Akt, establishing that antibody epitope position dictates distinct intracellular signaling cascades.\",\n      \"evidence\": \"Multiple monoclonal antibodies with dispase assay, STED microscopy, GTPase GLISA, pharmacological inhibition of p38 and Src\",\n      \"pmids\": [\"37143675\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How epitope position transmits distinct conformational signals across the membrane not determined\", \"Whether these hierarchies apply to polyclonal patient sera in vivo not tested\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Demonstrating two mechanistically distinct Dsg3 adhesion pools: a cell-surface pool whose binding depends on actin filaments and a cell-contact pool whose adhesion is actin-independent but regulated by PKCα-controlled intermediate filament anchorage, resolving how different cytoskeletal systems differentially support Dsg3 function.\",\n      \"evidence\": \"Hybrid STED/single-molecule force spectroscopy AFM on living keratinocytes with Latrunculin B and PMA treatments\",\n      \"pmids\": [\"36602635\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Adaptor proteins linking each pool to its respective cytoskeleton not identified\", \"Whether PV-IgG preferentially targets one pool not tested\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Establishing in vivo genetic requirement: homozygous loss-of-function deletion of DSG3 causes acantholytic blistering of oral and laryngeal mucosa (ABOLM) in humans, proving Dsg3 is non-redundantly required for mucosal epithelial integrity.\",\n      \"evidence\": \"Chromosomal microarray in dizygotic twins with ABOLM phenotype; autoimmune mechanism excluded\",\n      \"pmids\": [\"37850634\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No functional rescue or cell biology performed\", \"Genotype-phenotype correlation across different DSG3 mutations not established\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Extending Dsg3 signaling to Wnt/β-catenin in cancer: STAT3 transcriptionally activates DSG3, which then promotes AKT phosphorylation, inhibits GSK3β, and drives β-catenin nuclear translocation to upregulate SOX2 and MMP7, enhancing stemness and metastasis in bladder cancer.\",\n      \"evidence\": \"DSG3 knockdown in bladder cancer cells with Western blot pathway analysis, in vivo xenograft, and lung metastasis model\",\n      \"pmids\": [\"40605005\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Independent replication in other cancer types lacking\", \"Direct mechanism by which Dsg3 activates AKT not defined\", \"Whether this pathway operates in normal urothelium not addressed\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include: the structural basis of how antibody binding to distinct Dsg3 extracellular domains transmits conformational changes across the membrane to activate specific intracellular kinase cascades; the identity of the endocytic machinery and trafficking adaptors mediating Dsg3 internalization and retrograde transport; and whether the extradesmosomal Dsg3/E-cadherin/Src complex is a regulated signaling platform or a transient biosynthetic intermediate.\",\n      \"evidence\": \"Open questions synthesized from gaps in the current literature\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No structural model of full-length Dsg3 exists\", \"Endocytic route (clathrin vs. caveolae) unresolved\", \"Stoichiometry and regulation of the extradesmosomal complex unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098631\", \"supporting_discovery_ids\": [0, 5, 12, 13]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [9, 11]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [6, 7]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [3, 5, 7, 12]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [5]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [3, 12]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1500931\", \"supporting_discovery_ids\": [1, 7, 12, 13]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [6, 9, 11, 14]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [0, 4, 11]}\n    ],\n    \"complexes\": [\n      \"desmosome\",\n      \"extradesmosomal E-cadherin/Dsg3/β-catenin/Src complex\"\n    ],\n    \"partners\": [\n      \"JUP\",\n      \"CDH1\",\n      \"CTNNB1\",\n      \"SRC\",\n      \"CAV1\",\n      \"DSG1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}