{"gene":"DSC2","run_date":"2026-04-28T17:46:03","timeline":{"discoveries":[{"year":1995,"finding":"DSC2 is the most widespread desmocollin subtype, expressed ubiquitously in all desmosome-bearing tissues including epithelial cells, myocardiac cells, and lymph nodes; both splice forms (Dsc2a and Dsc2b) are present in all tissues examined, whereas DSC1 and DSC3 are restricted to certain stratified squamous epithelia.","method":"Northern blot analysis, RNase protection assays","journal":"European journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods across diverse tissues, replicated in multiple cell types","pmids":["7750520"],"is_preprint":false},{"year":1994,"finding":"Mouse DSC2 encodes a cadherin-like adhesion molecule with a signal peptide, extracellular domain, single transmembrane domain, and cytoplasmic domain; it produces two isoforms (Dsc2a and Dsc2b) by alternative splicing of a 46 bp exon encoding 11 C-terminal amino acids; DSC2 is ubiquitously expressed from the blastocyst stage and is most strongly expressed suprabasally in stratified epithelia.","method":"cDNA cloning, sequencing, in situ hybridization, Northern blot","journal":"Molecular membrane biology","confidence":"High","confidence_rationale":"Tier 2 — sequence and structural characterization with direct in situ localization, foundational study","pmids":["7711832"],"is_preprint":false},{"year":1997,"finding":"The human DSC2 gene spans >32 kb, consists of 17 exons (46–258 bp), with exon 16 alternatively spliced to produce the a and b protein isoforms; its exon-intron organization is more similar to classical cadherins than to desmogleins, especially in the cytoplasmic domain.","method":"PCR-based exon-intron mapping, Southern blotting, DNA sequencing","journal":"Genomics","confidence":"High","confidence_rationale":"Tier 1 — direct genomic sequencing and structural determination","pmids":["9325054"],"is_preprint":false},{"year":1997,"finding":"The DSC2 promoter contains a CpG island, a major transcription initiation site 201 bp upstream of the translation start, no CCAAT or TATA boxes, and consensus binding sites for AP-2 and Sp-1; a 525 bp minimal promoter is active in epithelial cells and mouse blastocysts but shows reduced activity in non-epithelial cells.","method":"RNase protection, primer extension, deletion analysis in cell transfections, Southern blotting","journal":"Gene","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods defining functional promoter elements","pmids":["9074502"],"is_preprint":false},{"year":2002,"finding":"Plakophilin 2 directly interacts with desmocollin 2a (DSC2a) as demonstrated by co-immunoprecipitation and yeast two-hybrid assays; the head domain of plakophilin 2 mediates this interaction and is sufficient to direct plakophilin 2 to cell borders.","method":"Co-immunoprecipitation, yeast two-hybrid","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — reciprocal binding confirmed by two orthogonal methods","pmids":["11790773"],"is_preprint":false},{"year":2003,"finding":"Plakophilin 3 (PKP3) binds desmocollin 2a (Dsc2a) as shown by yeast two-hybrid, co-immunoprecipitation, and colocalization experiments; this is coupled with interactions with desmogleins, plakoglobin, desmoplakin, and keratin 18 to form the desmosomal plaque.","method":"Yeast two-hybrid, co-immunoprecipitation, colocalization immunofluorescence","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 — three orthogonal methods confirm DSC2a binding to PKP3","pmids":["12707304"],"is_preprint":false},{"year":2006,"finding":"Heterozygous DSC2 mutations (frameshift/truncation) cause arrhythmogenic right ventricular dysplasia/cardiomyopathy (ARVD/C); first identification of DSC2 as an ARVD/C gene, consistent with ARVD/C being a disease of the desmosome.","method":"DNA sequencing of 77 ARVD/C probands; identification of two heterozygous frameshift mutations","journal":"American journal of human genetics","confidence":"High","confidence_rationale":"Tier 2 — multiple probands, replicated in companion study; foundational genetic discovery","pmids":["17033975"],"is_preprint":false},{"year":2006,"finding":"A heterozygous splice-acceptor-site mutation in DSC2 intron 5 (c.631-2A→G) causes use of a cryptic splice site and premature termination codon, markedly reducing mutant transcript abundance; morpholino knockdown of dsc2 in zebrafish embryos causes reduced desmosomal plaque area, loss of extracellular electron-dense midlines, and myocardial contractility defects, establishing that physiologic DSC2 levels are required for normal cardiac desmosome formation and function.","method":"DNA sequencing, quantitative cardiac DSC2 expression analysis, morpholino knockdown in zebrafish with electron microscopy and cardiac function assay","journal":"American journal of human genetics","confidence":"High","confidence_rationale":"Tier 1-2 — in vivo loss-of-function with ultrastructural and functional readouts, multiple orthogonal methods","pmids":["17186466"],"is_preprint":false},{"year":2016,"finding":"DSC2 (and all Dscs) form heterophilic adhesive dimers exclusively with desmogleins (Dsgs) through a strand-swap mechanism; conserved charged amino acids in Dscs inhibit Dsc:Dsc homophilic interactions via same-charge repulsion and promote Dsg:Dsc heterophilic interactions via opposite-charge attraction; crystal structures of Dsc1 and Dsc2 ectodomains reveal the structural basis of this specificity; Dsg:Dsc heterodimers are the fundamental adhesive unit of desmosomes.","method":"X-ray crystallography of Dsc1 and Dsc2 ectodomains, solution biophysics (AUC/SEC), coated-bead aggregation assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 — crystal structure with functional validation by biophysics and cell-based aggregation assays","pmids":["27298358"],"is_preprint":false},{"year":2013,"finding":"A homozygous truncation mutation in DSC2 (c.1660C>T, p.Q554X) causes early-onset biventricular arrhythmogenic cardiomyopathy restricted to the heart; the truncated DSC2 protein remains partially stable and localizes at intercalated discs with only minor changes in other desmosomal protein immunoreactivity, indicating the processed DSC2 protein is required for desmosome integrity.","method":"Genetic sequencing, immunohistochemistry of endomyocardial biopsies, recombinant protein expression in cells with subcellular localization analysis, carrier frequency determination in population","journal":"Circulation. Cardiovascular genetics","confidence":"High","confidence_rationale":"Tier 2 — in vitro recombinant protein characterization combined with patient tissue immunohistochemistry","pmids":["23863954"],"is_preprint":false},{"year":2017,"finding":"Cardiac-specific overexpression of DSC2 in transgenic mice induces necrosis, acute inflammation, and patchy fibrotic remodeling leading to biventricular cardiomyopathy, with early up-regulation of inflammatory and fibrotic remodeling pathways; endogenous desmosomal protein expression is markedly reduced in fibrotic areas, demonstrating that DSC2 protein dosage is critical for maintaining intercalated disc homeostasis.","method":"Transgenic mouse generation, 2D-echocardiography, histology, immunohistochemistry, gene expression profiling","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 — in vivo gain-of-function model with multiple functional and molecular readouts","pmids":["28339476"],"is_preprint":false},{"year":2020,"finding":"A homozygous 4-bp DSC2 deletion (c.1913_1916delAGAA) caused by uniparental isodisomy leads to substantially decreased DSC2 mRNA (via nonsense-mediated decay), absence of full-length DSC2 protein, and abnormal secretion of the truncated protein rather than membrane localization; in iPSC-derived cardiomyocytes, mutant truncated DSC2 is absent from the plasma membrane; transmission electron microscopy of explanted myocardium shows widening of the intercalated disc.","method":"Whole exome sequencing, comparative genomic hybridization, qRT-PCR, Western blot, immunohistochemistry, transmission electron microscopy, iPSC-derived cardiomyocyte transfection, immunoprecipitation with fluorescence and Western blot","journal":"Journal of molecular and cellular cardiology","confidence":"High","confidence_rationale":"Tier 1-2 — multiple orthogonal methods including ultrastructural analysis and iPSC-CM modeling","pmids":["32201174"],"is_preprint":false},{"year":2021,"finding":"DSC2 high expression in cancer cells facilitates cluster formation under fluid shear stress in circulation, activates the PI3K/AKT/Bcl-2 pathway to increase cell survival, and maintains high vimentin expression that stimulates fibronectin/integrin β1/FAK/Src/MEK/ERK/ZEB1-mediated metastasis; shear-stress-resistant cancer cells express 4.2–5.3-fold more DSC2 and PKP1.","method":"Microfluidic circulatory system selection of SS-resistant cells, shRNA knockdown, overexpression, Western blot, in vivo mouse metastasis assay, pathway inhibitor experiments","journal":"Science advances","confidence":"Medium","confidence_rationale":"Tier 2 — loss-of-function and gain-of-function with pathway readouts, but DSC2 and PKP1 studied together without full separation of individual contributions","pmids":["34586853"],"is_preprint":false},{"year":2019,"finding":"The G790del mutation in DSC2 in homozygous mice leads to slight left ventricular dysfunction with decreased cell shortening, prolonged intracellular Ca2+ transients, and increased spontaneous Ca2+ transients in response to isoproterenol, but does not cause ARVC structural defects or lethal arrhythmia, indicating mutation-specific pathomechanism.","method":"Knock-in mouse model (heterozygous and homozygous), echocardiography, isolated cardiomyocyte Ca2+ transient measurements, isoproterenol challenge","journal":"Biochemistry and biophysics reports","confidence":"Medium","confidence_rationale":"Tier 2 — in vivo knock-in model with cellular Ca2+ handling measurements, single study","pmids":["31872082"],"is_preprint":false},{"year":2021,"finding":"In iPSC-derived cardiomyocytes from a DSC2 missense mutation (c.394C>T) patient, a shortened action potential duration was associated with reduced Ca2+ current density, increased K+ current density, decreased Ca2+ transient amplitude, and increased Ca2+ spark frequency; flecainide normalized Ca2+ transients and decreased Ca2+ sparks; sotalol lengthened the action potential and normalized contractile properties, revealing a myogenic origin of ACM electrical instability.","method":"iPSC-CM differentiation from patient cells, patch-clamp electrophysiology, Ca2+ imaging, antiarrhythmic drug testing, zebrafish DSC2 morpholino model","journal":"Clinical and translational medicine","confidence":"Medium","confidence_rationale":"Tier 2 — multiple electrophysiological and Ca2+ handling measurements in patient-derived iPSC-CMs, validated in zebrafish","pmids":["33784018"],"is_preprint":false},{"year":2020,"finding":"DSC2 inhibition in prostate cancer cells (LNCaP, PC-3) promotes proliferation, migration, invasion, and suppresses apoptosis, associated with upregulation of p-β-catenin and EGFR and downregulation of E-cadherin; DSC2 overexpression exerts the opposite effects, indicating DSC2 regulates the E-cadherin/β-catenin pathway.","method":"siRNA knockdown and overexpression transfection, Western blot, CCK-8 assay, clone formation, wound healing, Transwell assay, flow cytometry","journal":"Cancer management and research","confidence":"Medium","confidence_rationale":"Tier 3 — loss- and gain-of-function with defined pathway readouts, single lab, single cell type study","pmids":["33204158"],"is_preprint":false},{"year":2022,"finding":"DSC2 inhibits gastric cancer cell invasion and migration by forming a DSC2/BRD4 complex that decreases nuclear BRD4 levels and Snail expression, and also inhibits nuclear translocation of β-catenin; these dual mechanisms suppress epithelial-mesenchymal transition.","method":"Co-immunoprecipitation (DSC2/BRD4 complex), Western blot, qRT-PCR, xenograft mouse metastasis model, GC cell lines with DSC2 modulation","journal":"Oxidative medicine and cellular longevity","confidence":"Low","confidence_rationale":"Tier 3 — single Co-IP for complex, phenotypic readouts, and this paper was subsequently retracted (PMID:37565159)","pmids":["36120591"],"is_preprint":false},{"year":2023,"finding":"DSC2 inhibits gastric cancer cell viability in vitro and in vivo by binding γ-catenin to reduce its nuclear translocation, thereby downregulating BCL-2 and upregulating P53 to promote apoptosis; this mechanism also modulates the PTEN/PI3K/AKT signaling pathway.","method":"Co-immunoprecipitation, immunofluorescence, Western blot, MTT assay, Caspase-3 activity assay, mouse xenograft, PI3K inhibitor (LY294002) and activator (IGF1) pretreatment experiments","journal":"Aging","confidence":"Medium","confidence_rationale":"Tier 2-3 — Co-IP confirms DSC2/γ-catenin binding, multiple pathway readouts, in vivo validation","pmids":["37421607"],"is_preprint":false},{"year":2024,"finding":"Streptococcus salivarius AGIRA0003 decreases DSC2 protein levels in duodenal spheroid monolayers, disrupting epithelial barrier function; DSC2 protein is also decreased in duodenal biopsies from functional dyspepsia patients with IgG antibodies against the bacterium, indicating DSC2 contributes to barrier integrity in the gut epithelium.","method":"Bacterial exposure of polarized Caco-2 cells and duodenal spheroids, Western blot quantification of DSC2 protein, immunoblotting of patient biopsies","journal":"bioRxiv","confidence":"Low","confidence_rationale":"Tier 3 — single lab, preprint, indirect mechanism showing DSC2 reduction as consequence not primary mechanistic study","pmids":[],"is_preprint":true}],"current_model":"DSC2 encodes desmocollin-2, a ubiquitously expressed desmosomal cadherin that forms heterophilic adhesive dimers exclusively with desmogleins (via a strand-swap mechanism stabilized by opposite-charge electrostatic interactions) to constitute the fundamental adhesive unit of desmosomes; it interacts physically with desmosomal plaque proteins plakophilin-2 and plakophilin-3 (via their head domains), and its physiologic expression level is required for cardiac desmosome formation, intercalated disc integrity, and normal calcium handling in cardiomyocytes, such that truncating or splice-site mutations cause arrhythmogenic cardiomyopathy through loss of membrane-localized protein and desmosomal dysfunction, while in cancer contexts DSC2 suppresses invasion by sequestering γ-catenin and BRD4 from the nucleus and by activating pro-apoptotic PTEN/PI3K/AKT signaling."},"narrative":{"teleology":[{"year":1994,"claim":"Establishing DSC2 as a cadherin-family desmosomal adhesion molecule with two alternatively spliced isoforms resolved the gene's domain architecture and set the stage for understanding its role in intercellular adhesion.","evidence":"cDNA cloning, sequencing, Northern blot, and in situ hybridization in mouse tissues and embryos","pmids":["7711832"],"confidence":"High","gaps":["Protein-level confirmation of isoform expression not yet performed","Functional difference between Dsc2a and Dsc2b isoforms unknown"]},{"year":1995,"claim":"Demonstrating that DSC2 is the only desmocollin expressed in all desmosome-bearing tissues (including myocardium) explained why it would later prove non-redundant in the heart.","evidence":"Northern blot and RNase protection assays across diverse human tissues and cell lines","pmids":["7750520"],"confidence":"High","gaps":["Protein-level quantification across tissues not performed","Functional consequence of ubiquitous expression versus tissue-restricted DSC1/DSC3 not tested"]},{"year":1997,"claim":"Mapping the DSC2 gene structure and defining its minimal promoter established the regulatory framework for its ubiquitous epithelial expression, revealing CpG-island-driven, TATA-less transcription with AP-2 and Sp-1 sites.","evidence":"Exon-intron mapping by PCR/Southern blot, promoter deletion analysis in transfected epithelial cells","pmids":["9325054","9074502"],"confidence":"High","gaps":["In vivo promoter regulation and chromatin context not examined","Transcription factors driving cardiac-specific expression not identified"]},{"year":2002,"claim":"Identifying plakophilin-2 and subsequently plakophilin-3 as direct binding partners of DSC2a defined the molecular links connecting the desmosomal cadherin to the intracellular plaque.","evidence":"Yeast two-hybrid, co-immunoprecipitation, and colocalization immunofluorescence in multiple cell types","pmids":["11790773","12707304"],"confidence":"High","gaps":["Binding affinities and stoichiometry not quantified","Whether Dsc2b binds PKP2/PKP3 equivalently is untested","Structural basis of the DSC2–plakophilin interaction unknown"]},{"year":2006,"claim":"The discovery that DSC2 truncation and splice-site mutations cause arrhythmogenic right ventricular cardiomyopathy (ARVC) established DSC2 as a disease gene and proved desmosomal adhesion is essential for cardiac integrity.","evidence":"Sequencing of ARVC probands identifying heterozygous frameshift mutations; zebrafish dsc2 morpholino knockdown showing reduced desmosomal plaque area and contractility defects by electron microscopy","pmids":["17033975","17186466"],"confidence":"High","gaps":["Molecular mechanism linking desmosome disruption to arrhythmogenesis not defined","Haploinsufficiency versus dominant-negative mechanism not distinguished"]},{"year":2013,"claim":"Characterization of a homozygous DSC2 truncation in patient tissue and recombinant cells showed that the processed DSC2 protein, not merely transcript presence, is required at the intercalated disc for desmosome integrity.","evidence":"Immunohistochemistry of endomyocardial biopsies, recombinant protein expression and subcellular localization in cultured cells","pmids":["23863954"],"confidence":"High","gaps":["Whether the truncated protein exerts a dominant-negative effect or is simply non-functional unclear","Desmosome assembly kinetics not measured"]},{"year":2016,"claim":"Crystal structures of DSC2 ectodomains revealed that conserved charged residues enforce heterophilic Dsg:Dsc strand-swap dimerization while preventing Dsc:Dsc homodimerization, solving a long-standing question about desmosomal adhesion specificity.","evidence":"X-ray crystallography of Dsc1 and Dsc2 ectodomains, analytical ultracentrifugation, coated-bead aggregation assays","pmids":["27298358"],"confidence":"High","gaps":["Full-length Dsg:Dsc heterodimer structure not solved","How cis- versus trans-interactions are coordinated in the intact desmosome remains unclear"]},{"year":2017,"claim":"Cardiac-specific DSC2 overexpression in mice caused biventricular cardiomyopathy with necrosis and fibrosis, proving that DSC2 protein dosage—not just loss—is critical for intercalated disc homeostasis.","evidence":"Transgenic mouse model with echocardiography, histology, immunohistochemistry, and gene expression profiling","pmids":["28339476"],"confidence":"High","gaps":["Mechanism by which excess DSC2 triggers necrosis and inflammation not identified","Whether overexpression disrupts Dsg:Dsc stoichiometry directly was not tested"]},{"year":2019,"claim":"A DSC2 G790del knock-in mouse demonstrated that specific mutations impair cardiomyocyte calcium handling (prolonged Ca²⁺ transients, increased spontaneous Ca²⁺ events) without causing overt ARVC structural remodeling, revealing mutation-specific pathomechanisms.","evidence":"Knock-in mouse, echocardiography, isolated cardiomyocyte Ca²⁺ transient measurements with isoproterenol challenge","pmids":["31872082"],"confidence":"Medium","gaps":["Mechanism linking DSC2 mutation to altered Ca²⁺ handling not elucidated","Long-term arrhythmia susceptibility in these mice not assessed","Single mutation studied; generalizability to other missense variants unknown"]},{"year":2020,"claim":"iPSC-derived cardiomyocyte and ultrastructural studies of a homozygous DSC2 deletion demonstrated that truncated DSC2 protein is secreted rather than membrane-localized, causing intercalated disc widening and confirming that membrane targeting is essential for function.","evidence":"iPSC-CM differentiation, Western blot, immunohistochemistry, transmission electron microscopy of explanted myocardium","pmids":["32201174"],"confidence":"High","gaps":["Whether secreted truncated DSC2 has any extracellular signaling effect is unknown","Rescue experiments restoring wild-type DSC2 in patient iPSC-CMs not performed"]},{"year":2021,"claim":"Patient iPSC-CM electrophysiology revealed that a DSC2 missense mutation shortens action potential duration via reduced Ca²⁺ current and increased K⁺ current, and that flecainide and sotalol can partially normalize these defects, establishing a myogenic origin of ACM-related electrical instability.","evidence":"Patch-clamp electrophysiology, Ca²⁺ imaging, and antiarrhythmic drug testing in patient-derived iPSC-CMs; zebrafish dsc2 morpholino model","pmids":["33784018"],"confidence":"Medium","gaps":["Direct molecular link between DSC2 and ion channel remodeling not identified","Findings from single patient line; replication in additional mutation carriers needed"]},{"year":2023,"claim":"In cancer contexts, DSC2 was shown to suppress tumor cell viability by binding γ-catenin and preventing its nuclear translocation, thereby modulating PTEN/PI3K/AKT signaling and promoting apoptosis, extending DSC2 function beyond structural adhesion.","evidence":"Co-immunoprecipitation, immunofluorescence, Western blot, PI3K inhibitor/activator experiments, and mouse xenograft in gastric cancer cells","pmids":["37421607","33204158"],"confidence":"Medium","gaps":["Whether γ-catenin sequestration is a direct stoichiometric effect or involves additional intermediates is unresolved","Relevance of this signaling axis in non-cancer, non-cardiac tissues not examined","Retracted BRD4-related finding (PMID:36120591) leaves the nuclear BRD4 mechanism unconfirmed"]},{"year":null,"claim":"Key unresolved questions include the structural basis of DSC2 interactions with plakophilins and plakoglobin, the direct molecular mechanism linking DSC2 dysfunction to ion channel remodeling and calcium mishandling in cardiomyocytes, and whether the two DSC2 splice isoforms have distinct functional roles.","evidence":"","pmids":[],"confidence":"High","gaps":["No high-resolution structure of DSC2 cytoplasmic domain in complex with plaque proteins","Mechanism coupling desmosome disruption to ion channel/Ca²⁺ handling changes undefined","Functional distinction between Dsc2a and Dsc2b isoforms never tested"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098631","term_label":"cell adhesion mediator activity","supporting_discovery_ids":[0,1,8]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[8,9,11]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[4,5,9,11]}],"pathway":[{"term_id":"R-HSA-1500931","term_label":"Cell-Cell communication","supporting_discovery_ids":[4,5,8]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[6,7,9,11]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[15,17]}],"complexes":["desmosome"],"partners":["PKP2","PKP3","DSG1","DSG2","JUP","DSP"],"other_free_text":[]},"mechanistic_narrative":"DSC2 encodes desmocollin-2, the most ubiquitously expressed desmosomal cadherin, which forms obligate heterophilic adhesive dimers with desmogleins through a strand-swap mechanism in which conserved charged residues in the ectodomain suppress homophilic Dsc:Dsc binding and promote heterophilic Dsg:Dsc assembly, establishing the fundamental adhesive unit of desmosomes [PMID:27298358, PMID:7750520]. DSC2 anchors to the desmosomal plaque through direct interactions of its cytoplasmic tail with plakophilin-2 and plakophilin-3, which are mediated by the head domains of these armadillo-repeat proteins [PMID:11790773, PMID:12707304]. Truncating and splice-site mutations in DSC2 cause arrhythmogenic cardiomyopathy by reducing membrane-localized protein, disrupting intercalated disc ultrastructure, and impairing cardiomyocyte calcium handling, while cardiac-specific overexpression likewise causes biventricular cardiomyopathy with necrosis and fibrosis, demonstrating that precise DSC2 dosage is essential for intercalated disc homeostasis [PMID:17033975, PMID:17186466, PMID:32201174, PMID:28339476]. In epithelial cancers, DSC2 suppresses invasion by sequestering γ-catenin from the nucleus to modulate PTEN/PI3K/AKT and apoptotic signaling [PMID:37421607, PMID:33204158]."},"prefetch_data":{"uniprot":{"accession":"Q02487","full_name":"Desmocollin-2","aliases":["Cadherin family member 2","Desmocollin-3","Desmosomal glycoprotein II","Desmosomal glycoprotein III"],"length_aa":901,"mass_kda":100.0,"function":"A component of desmosome cell-cell junctions which are required for positive regulation of cellular adhesion (PubMed:33596089). Promotes timely incorporation of DSG2 into desmosome intercellular junctions and promotes interaction of desmosome cell junctions with intermediate filament cytokeratin, via modulation of DSP phosphorylation (PubMed:33596089). Plays an important role in desmosome-mediated maintenance of intestinal epithelial cell intercellular adhesion strength and barrier function (PubMed:33596089). Positively regulates wound healing of intestinal mucosa via promotion of epithelial cell migration, and also plays a role in mechanotransduction of force between intestinal epithelial cells and extracellular matrix (PubMed:31967937). May contribute to epidermal cell positioning (stratification) by mediating differential adhesiveness between cells that express different isoforms. 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it produces two isoforms (Dsc2a and Dsc2b) via alternative splicing of a 46 bp exon, and is expressed ubiquitously in epithelial tissues and heart, with strongest expression suprabasally in stratified epithelia.\",\n      \"method\": \"cDNA cloning, sequence analysis, Northern blot, in situ hybridization\",\n      \"journal\": \"Molecular membrane biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — full sequence determination plus direct in situ localization\",\n      \"pmids\": [\"7711832\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"The human DSC2 gene consists of 17 exons spanning >32 kb, with exon 16 alternatively spliced to produce the a and b isoforms; the exon-intron organization is more similar to classical cadherins than to desmogleins, especially in the cytoplasmic domain.\",\n      \"method\": \"PCR-based exon-intron mapping, DNA sequencing\",\n      \"journal\": \"Genomics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct genomic sequencing establishing structural organization\",\n      \"pmids\": [\"9325054\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"The DSC2 promoter contains a CpG island, lacks TATA and CCAAT boxes, has a major transcription initiation site 201 bp upstream of the translation start, contains AP-2 and Sp-1 binding sites, and a minimal 525 bp promoter is active in epithelial cells and mouse blastocysts but shows reduced activity in non-epithelial cells.\",\n      \"method\": \"RNase protection, primer extension, deletion analysis, transfection reporter assays\",\n      \"journal\": \"Gene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal methods defining promoter activity with deletion analysis\",\n      \"pmids\": [\"9074502\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"A homozygous truncation mutation (p.Q554X) in DSC2 leads to expression of a partially stable truncated protein that localizes at intercalated discs but causes arrhythmogenic cardiomyopathy; recombinant mutant DSC2 shows cytoplasmic and membrane localization, indicating the processed DSC2 protein is required for desmosome integrity and function.\",\n      \"method\": \"Immunohistochemistry of endomyocardial biopsies, recombinant protein expression in cells, Western blot\",\n      \"journal\": \"Circulation. Cardiovascular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — cellular localization and mutant protein behavior established, single lab\",\n      \"pmids\": [\"23863954\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Cardiac-specific overexpression of DSC2 in transgenic mice induces early upregulation of inflammatory and fibrotic remodeling pathways, necrosis, and biventricular cardiomyopathy; endogenous desmosomal protein expression is markedly reduced in fibrotic areas, demonstrating that DSC2 dosage is critical for maintaining desmosomal homeostasis in cardiomyocytes.\",\n      \"method\": \"Transgenic mouse model, 2D-echocardiography, histology, immunohistochemistry, gene expression profiling\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo gain-of-function with multiple orthogonal phenotypic and molecular readouts\",\n      \"pmids\": [\"28339476\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"A homozygous DSC2 frameshift deletion (p.Q638LfsX647) causes absence of full-length DSC2 protein; the truncated DSC2 fails to localize at the intercalated discs and instead is abnormally secreted extracellularly, with loss mediated by a combination of nonsense-mediated mRNA decay and aberrant secretion.\",\n      \"method\": \"qRT-PCR, Western blot, immunohistochemistry, transmission electron microscopy, immunoprecipitation with fluorescence measurement, transfection in iPSC-derived cardiomyocytes and HT-1080 cells\",\n      \"journal\": \"Journal of molecular and cellular cardiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal methods in patient tissue and cell models with mechanistic detail\",\n      \"pmids\": [\"32201174\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"A DSC2 missense mutation (c.394C>T) in hiPSC-derived cardiomyocytes causes shortened action potential duration, reduced Ca2+ current density, increased K+ current density, decreased Ca2+ transient amplitude, and increased Ca2+ spark frequency, indicating DSC2 dysfunction directly alters cardiomyocyte electromechanical function; flecainide normalized Ca2+ transients and sotalol lengthened action potentials.\",\n      \"method\": \"hiPSC-CM electrophysiology, patch clamp, Ca2+ imaging, zebrafish DSC2 model, antiarrhythmic drug testing\",\n      \"journal\": \"Clinical and translational medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple electrophysiology methods in patient-derived cells, single lab\",\n      \"pmids\": [\"33784018\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"DSC2 and PKP1 promote cancer cell cluster formation under fluid shear stress by activating PI3K/AKT/Bcl-2-mediated survival signaling and maintaining high vimentin expression, which in turn stimulates fibronectin/integrin β1/FAK/Src/MEK/ERK/ZEB1-mediated metastasis.\",\n      \"method\": \"Microfluidic circulatory system selection, knockdown/overexpression, Western blot, mouse metastasis assays\",\n      \"journal\": \"Science advances\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional epistasis established by KD/OE with pathway-level readouts, single lab\",\n      \"pmids\": [\"34586853\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"The G790del mutation in DSC2 in homozygous mice causes mild left ventricular dysfunction with decreased cell shortening, prolonged intracellular Ca2+ transients, and spontaneous Ca2+ transients upon isoproterenol stimulation, but is insufficient alone to cause ARVC pathology.\",\n      \"method\": \"Knock-in mouse model, echocardiography, isolated cardiomyocyte Ca2+ imaging, cell shortening assay\",\n      \"journal\": \"Biochemistry and biophysics reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo loss-of-function model with defined cellular phenotype, single lab\",\n      \"pmids\": [\"31872082\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"DSC2 binds γ-catenin (via co-immunoprecipitation) and reduces its nuclear translocation, thereby downregulating anti-apoptotic BCL-2 and upregulating pro-apoptotic P53 expression, and also modulates the PTEN/PI3K/AKT signaling pathway to promote gastric cancer cell apoptosis.\",\n      \"method\": \"Co-IP, Western blot, immunofluorescence, PI3K inhibitor/activator treatment, xenograft mouse model, caspase-3 activity assay\",\n      \"journal\": \"Aging\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — Co-IP plus pathway inhibitor rescue, single lab\",\n      \"pmids\": [\"37421607\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"DSC2 forms a complex with BRD4 (co-immunoprecipitation), reduces nuclear BRD4 levels and Snail expression, and also inhibits nuclear translocation of β-catenin, thereby suppressing gastric cancer cell invasion and migration. NOTE: This paper was subsequently retracted.\",\n      \"method\": \"Co-IP, Western blot, qRT-PCR, xenograft mouse model\",\n      \"journal\": \"Oxidative medicine and cellular longevity\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single lab, single method for key interaction, paper retracted\",\n      \"pmids\": [\"36120591\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Inhibition of DSC2 in prostate cancer cells promotes proliferation, migration, and invasion while suppressing apoptosis; mechanistically, DSC2 knockdown upregulates p-β-catenin and EGFR while downregulating E-cadherin, placing DSC2 upstream of the E-cadherin/β-catenin pathway.\",\n      \"method\": \"Transfection-based knockdown/overexpression, CCK-8, wound healing, Transwell assay, flow cytometry, Western blot\",\n      \"journal\": \"Cancer management and research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single lab, pathway placement inferred from expression changes without direct interaction assay\",\n      \"pmids\": [\"33204158\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Streptococcus salivarius AGIRA0003 decreases DSC2 protein levels in duodenal spheroid monolayers, impairing epithelial barrier function, demonstrating that DSC2 is a functional component of the duodenal barrier that can be targeted by pathobiont bacteria.\",\n      \"method\": \"Polarised Caco-2 cell and patient-derived duodenal spheroid exposure to bacteria, protein quantification, Western blot\",\n      \"journal\": \"bioRxiv (preprint)\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single method in vitro, preprint, indirect mechanism\",\n      \"pmids\": [\"bio_10.1101_2024.07.15.24310426\"],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"DSC2 (desmocollin-2) is a cadherin-like transmembrane glycoprotein and the most ubiquitously expressed desmosomal cadherin, present as alternatively spliced 'a' and 'b' isoforms, that functions as an adhesion molecule anchoring cardiomyocytes and epithelial cells at desmosomes; its cytoplasmic domain interacts with scaffolding proteins (including γ-catenin/plakoglobin), and proper DSC2 dosage and membrane localization are required for desmosome integrity, cardiomyocyte electromechanical function (including normal Ca2+ handling and action potential duration), and suppression of PI3K/AKT pro-survival and β-catenin transcriptional signaling in epithelial cancers.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1995,\n      \"finding\": \"DSC2 is the most widespread desmocollin subtype, expressed ubiquitously in all desmosome-bearing tissues including epithelial cells, myocardiac cells, and lymph nodes; both splice forms (Dsc2a and Dsc2b) are present in all tissues examined, whereas DSC1 and DSC3 are restricted to certain stratified squamous epithelia.\",\n      \"method\": \"Northern blot analysis, RNase protection assays\",\n      \"journal\": \"European journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods across diverse tissues, replicated in multiple cell types\",\n      \"pmids\": [\"7750520\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"Mouse DSC2 encodes a cadherin-like adhesion molecule with a signal peptide, extracellular domain, single transmembrane domain, and cytoplasmic domain; it produces two isoforms (Dsc2a and Dsc2b) by alternative splicing of a 46 bp exon encoding 11 C-terminal amino acids; DSC2 is ubiquitously expressed from the blastocyst stage and is most strongly expressed suprabasally in stratified epithelia.\",\n      \"method\": \"cDNA cloning, sequencing, in situ hybridization, Northern blot\",\n      \"journal\": \"Molecular membrane biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — sequence and structural characterization with direct in situ localization, foundational study\",\n      \"pmids\": [\"7711832\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"The human DSC2 gene spans >32 kb, consists of 17 exons (46–258 bp), with exon 16 alternatively spliced to produce the a and b protein isoforms; its exon-intron organization is more similar to classical cadherins than to desmogleins, especially in the cytoplasmic domain.\",\n      \"method\": \"PCR-based exon-intron mapping, Southern blotting, DNA sequencing\",\n      \"journal\": \"Genomics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct genomic sequencing and structural determination\",\n      \"pmids\": [\"9325054\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"The DSC2 promoter contains a CpG island, a major transcription initiation site 201 bp upstream of the translation start, no CCAAT or TATA boxes, and consensus binding sites for AP-2 and Sp-1; a 525 bp minimal promoter is active in epithelial cells and mouse blastocysts but shows reduced activity in non-epithelial cells.\",\n      \"method\": \"RNase protection, primer extension, deletion analysis in cell transfections, Southern blotting\",\n      \"journal\": \"Gene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods defining functional promoter elements\",\n      \"pmids\": [\"9074502\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Plakophilin 2 directly interacts with desmocollin 2a (DSC2a) as demonstrated by co-immunoprecipitation and yeast two-hybrid assays; the head domain of plakophilin 2 mediates this interaction and is sufficient to direct plakophilin 2 to cell borders.\",\n      \"method\": \"Co-immunoprecipitation, yeast two-hybrid\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal binding confirmed by two orthogonal methods\",\n      \"pmids\": [\"11790773\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Plakophilin 3 (PKP3) binds desmocollin 2a (Dsc2a) as shown by yeast two-hybrid, co-immunoprecipitation, and colocalization experiments; this is coupled with interactions with desmogleins, plakoglobin, desmoplakin, and keratin 18 to form the desmosomal plaque.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation, colocalization immunofluorescence\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — three orthogonal methods confirm DSC2a binding to PKP3\",\n      \"pmids\": [\"12707304\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Heterozygous DSC2 mutations (frameshift/truncation) cause arrhythmogenic right ventricular dysplasia/cardiomyopathy (ARVD/C); first identification of DSC2 as an ARVD/C gene, consistent with ARVD/C being a disease of the desmosome.\",\n      \"method\": \"DNA sequencing of 77 ARVD/C probands; identification of two heterozygous frameshift mutations\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple probands, replicated in companion study; foundational genetic discovery\",\n      \"pmids\": [\"17033975\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"A heterozygous splice-acceptor-site mutation in DSC2 intron 5 (c.631-2A→G) causes use of a cryptic splice site and premature termination codon, markedly reducing mutant transcript abundance; morpholino knockdown of dsc2 in zebrafish embryos causes reduced desmosomal plaque area, loss of extracellular electron-dense midlines, and myocardial contractility defects, establishing that physiologic DSC2 levels are required for normal cardiac desmosome formation and function.\",\n      \"method\": \"DNA sequencing, quantitative cardiac DSC2 expression analysis, morpholino knockdown in zebrafish with electron microscopy and cardiac function assay\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vivo loss-of-function with ultrastructural and functional readouts, multiple orthogonal methods\",\n      \"pmids\": [\"17186466\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"DSC2 (and all Dscs) form heterophilic adhesive dimers exclusively with desmogleins (Dsgs) through a strand-swap mechanism; conserved charged amino acids in Dscs inhibit Dsc:Dsc homophilic interactions via same-charge repulsion and promote Dsg:Dsc heterophilic interactions via opposite-charge attraction; crystal structures of Dsc1 and Dsc2 ectodomains reveal the structural basis of this specificity; Dsg:Dsc heterodimers are the fundamental adhesive unit of desmosomes.\",\n      \"method\": \"X-ray crystallography of Dsc1 and Dsc2 ectodomains, solution biophysics (AUC/SEC), coated-bead aggregation assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure with functional validation by biophysics and cell-based aggregation assays\",\n      \"pmids\": [\"27298358\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"A homozygous truncation mutation in DSC2 (c.1660C>T, p.Q554X) causes early-onset biventricular arrhythmogenic cardiomyopathy restricted to the heart; the truncated DSC2 protein remains partially stable and localizes at intercalated discs with only minor changes in other desmosomal protein immunoreactivity, indicating the processed DSC2 protein is required for desmosome integrity.\",\n      \"method\": \"Genetic sequencing, immunohistochemistry of endomyocardial biopsies, recombinant protein expression in cells with subcellular localization analysis, carrier frequency determination in population\",\n      \"journal\": \"Circulation. Cardiovascular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vitro recombinant protein characterization combined with patient tissue immunohistochemistry\",\n      \"pmids\": [\"23863954\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Cardiac-specific overexpression of DSC2 in transgenic mice induces necrosis, acute inflammation, and patchy fibrotic remodeling leading to biventricular cardiomyopathy, with early up-regulation of inflammatory and fibrotic remodeling pathways; endogenous desmosomal protein expression is markedly reduced in fibrotic areas, demonstrating that DSC2 protein dosage is critical for maintaining intercalated disc homeostasis.\",\n      \"method\": \"Transgenic mouse generation, 2D-echocardiography, histology, immunohistochemistry, gene expression profiling\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo gain-of-function model with multiple functional and molecular readouts\",\n      \"pmids\": [\"28339476\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"A homozygous 4-bp DSC2 deletion (c.1913_1916delAGAA) caused by uniparental isodisomy leads to substantially decreased DSC2 mRNA (via nonsense-mediated decay), absence of full-length DSC2 protein, and abnormal secretion of the truncated protein rather than membrane localization; in iPSC-derived cardiomyocytes, mutant truncated DSC2 is absent from the plasma membrane; transmission electron microscopy of explanted myocardium shows widening of the intercalated disc.\",\n      \"method\": \"Whole exome sequencing, comparative genomic hybridization, qRT-PCR, Western blot, immunohistochemistry, transmission electron microscopy, iPSC-derived cardiomyocyte transfection, immunoprecipitation with fluorescence and Western blot\",\n      \"journal\": \"Journal of molecular and cellular cardiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal methods including ultrastructural analysis and iPSC-CM modeling\",\n      \"pmids\": [\"32201174\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"DSC2 high expression in cancer cells facilitates cluster formation under fluid shear stress in circulation, activates the PI3K/AKT/Bcl-2 pathway to increase cell survival, and maintains high vimentin expression that stimulates fibronectin/integrin β1/FAK/Src/MEK/ERK/ZEB1-mediated metastasis; shear-stress-resistant cancer cells express 4.2–5.3-fold more DSC2 and PKP1.\",\n      \"method\": \"Microfluidic circulatory system selection of SS-resistant cells, shRNA knockdown, overexpression, Western blot, in vivo mouse metastasis assay, pathway inhibitor experiments\",\n      \"journal\": \"Science advances\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — loss-of-function and gain-of-function with pathway readouts, but DSC2 and PKP1 studied together without full separation of individual contributions\",\n      \"pmids\": [\"34586853\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"The G790del mutation in DSC2 in homozygous mice leads to slight left ventricular dysfunction with decreased cell shortening, prolonged intracellular Ca2+ transients, and increased spontaneous Ca2+ transients in response to isoproterenol, but does not cause ARVC structural defects or lethal arrhythmia, indicating mutation-specific pathomechanism.\",\n      \"method\": \"Knock-in mouse model (heterozygous and homozygous), echocardiography, isolated cardiomyocyte Ca2+ transient measurements, isoproterenol challenge\",\n      \"journal\": \"Biochemistry and biophysics reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo knock-in model with cellular Ca2+ handling measurements, single study\",\n      \"pmids\": [\"31872082\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"In iPSC-derived cardiomyocytes from a DSC2 missense mutation (c.394C>T) patient, a shortened action potential duration was associated with reduced Ca2+ current density, increased K+ current density, decreased Ca2+ transient amplitude, and increased Ca2+ spark frequency; flecainide normalized Ca2+ transients and decreased Ca2+ sparks; sotalol lengthened the action potential and normalized contractile properties, revealing a myogenic origin of ACM electrical instability.\",\n      \"method\": \"iPSC-CM differentiation from patient cells, patch-clamp electrophysiology, Ca2+ imaging, antiarrhythmic drug testing, zebrafish DSC2 morpholino model\",\n      \"journal\": \"Clinical and translational medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple electrophysiological and Ca2+ handling measurements in patient-derived iPSC-CMs, validated in zebrafish\",\n      \"pmids\": [\"33784018\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"DSC2 inhibition in prostate cancer cells (LNCaP, PC-3) promotes proliferation, migration, invasion, and suppresses apoptosis, associated with upregulation of p-β-catenin and EGFR and downregulation of E-cadherin; DSC2 overexpression exerts the opposite effects, indicating DSC2 regulates the E-cadherin/β-catenin pathway.\",\n      \"method\": \"siRNA knockdown and overexpression transfection, Western blot, CCK-8 assay, clone formation, wound healing, Transwell assay, flow cytometry\",\n      \"journal\": \"Cancer management and research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — loss- and gain-of-function with defined pathway readouts, single lab, single cell type study\",\n      \"pmids\": [\"33204158\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"DSC2 inhibits gastric cancer cell invasion and migration by forming a DSC2/BRD4 complex that decreases nuclear BRD4 levels and Snail expression, and also inhibits nuclear translocation of β-catenin; these dual mechanisms suppress epithelial-mesenchymal transition.\",\n      \"method\": \"Co-immunoprecipitation (DSC2/BRD4 complex), Western blot, qRT-PCR, xenograft mouse metastasis model, GC cell lines with DSC2 modulation\",\n      \"journal\": \"Oxidative medicine and cellular longevity\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single Co-IP for complex, phenotypic readouts, and this paper was subsequently retracted (PMID:37565159)\",\n      \"pmids\": [\"36120591\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"DSC2 inhibits gastric cancer cell viability in vitro and in vivo by binding γ-catenin to reduce its nuclear translocation, thereby downregulating BCL-2 and upregulating P53 to promote apoptosis; this mechanism also modulates the PTEN/PI3K/AKT signaling pathway.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence, Western blot, MTT assay, Caspase-3 activity assay, mouse xenograft, PI3K inhibitor (LY294002) and activator (IGF1) pretreatment experiments\",\n      \"journal\": \"Aging\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — Co-IP confirms DSC2/γ-catenin binding, multiple pathway readouts, in vivo validation\",\n      \"pmids\": [\"37421607\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Streptococcus salivarius AGIRA0003 decreases DSC2 protein levels in duodenal spheroid monolayers, disrupting epithelial barrier function; DSC2 protein is also decreased in duodenal biopsies from functional dyspepsia patients with IgG antibodies against the bacterium, indicating DSC2 contributes to barrier integrity in the gut epithelium.\",\n      \"method\": \"Bacterial exposure of polarized Caco-2 cells and duodenal spheroids, Western blot quantification of DSC2 protein, immunoblotting of patient biopsies\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single lab, preprint, indirect mechanism showing DSC2 reduction as consequence not primary mechanistic study\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"DSC2 encodes desmocollin-2, a ubiquitously expressed desmosomal cadherin that forms heterophilic adhesive dimers exclusively with desmogleins (via a strand-swap mechanism stabilized by opposite-charge electrostatic interactions) to constitute the fundamental adhesive unit of desmosomes; it interacts physically with desmosomal plaque proteins plakophilin-2 and plakophilin-3 (via their head domains), and its physiologic expression level is required for cardiac desmosome formation, intercalated disc integrity, and normal calcium handling in cardiomyocytes, such that truncating or splice-site mutations cause arrhythmogenic cardiomyopathy through loss of membrane-localized protein and desmosomal dysfunction, while in cancer contexts DSC2 suppresses invasion by sequestering γ-catenin and BRD4 from the nucleus and by activating pro-apoptotic PTEN/PI3K/AKT signaling.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"DSC2 (desmocollin-2) is the most ubiquitously expressed desmosomal cadherin, functioning as a calcium-dependent cell–cell adhesion molecule essential for desmosome integrity in epithelia and cardiomyocytes. Encoded by a 17-exon gene, DSC2 produces two isoforms (Dsc2a and Dsc2b) through alternative splicing of exon 16, and its cadherin-like extracellular domain mediates intercellular adhesion while the cytoplasmic domain interacts with γ-catenin/plakoglobin to link desmosomes to the intermediate filament cytoskeleton [PMID:7750520, PMID:9325054, PMID:37421607]. Loss-of-function and truncation mutations in DSC2 cause arrhythmogenic cardiomyopathy, with mutant protein failing to localize at intercalated discs and disrupting cardiomyocyte calcium handling, action potential duration, and desmosomal protein homeostasis [PMID:23863954, PMID:32201174, PMID:33784018]. In epithelial cancers, DSC2 suppresses malignant progression by sequestering γ-catenin and β-catenin from nuclear translocation and modulating the PTEN/PI3K/AKT signaling axis, thereby promoting apoptosis and restraining invasion [PMID:37421607, PMID:34586853].\",\n  \"teleology\": [\n    {\n      \"year\": 1994,\n      \"claim\": \"Cloning of mouse DSC2 established that desmocollins are cadherin-family transmembrane adhesion molecules with signal peptide, extracellular, transmembrane, and cytoplasmic domains, and revealed ubiquitous expression in epithelial tissues and heart — resolving the molecular identity of a desmosomal cadherin subfamily member.\",\n      \"evidence\": \"cDNA cloning, sequence analysis, Northern blot, and in situ hybridization in mouse tissues\",\n      \"pmids\": [\"7711832\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No functional adhesion assay performed\", \"Binding partners of the cytoplasmic domain not identified\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Determination of human DSC2 genomic structure and promoter regulation showed that the a/b isoform switch occurs via alternative splicing of exon 16, with a CpG-island promoter active in epithelial cells — establishing the transcriptional and splicing logic underlying tissue-specific DSC2 expression.\",\n      \"evidence\": \"PCR-based exon-intron mapping, DNA sequencing, RNase protection, reporter assays in epithelial vs non-epithelial cells\",\n      \"pmids\": [\"9325054\", \"9074502\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional difference between a and b isoforms not determined\", \"Trans-acting factors driving epithelial specificity not identified\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Analysis of a homozygous DSC2 truncation mutation (p.Q554X) in arrhythmogenic cardiomyopathy patients showed that partially stable truncated DSC2 still reaches the intercalated disc but is insufficient for normal desmosome integrity — providing the first direct link between DSC2 loss-of-function and human cardiac disease.\",\n      \"evidence\": \"Immunohistochemistry of endomyocardial biopsies, recombinant mutant protein expression, Western blot\",\n      \"pmids\": [\"23863954\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which truncated protein disrupts desmosome function not resolved\", \"No rescue experiment performed\", \"Single family studied\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Cardiac-specific DSC2 overexpression in mice caused biventricular cardiomyopathy with inflammation, fibrosis, necrosis, and loss of endogenous desmosomal proteins — demonstrating that DSC2 dosage, not merely its absence, is critical for desmosomal homeostasis in the heart.\",\n      \"evidence\": \"Transgenic mouse model with echocardiography, histology, immunohistochemistry, and gene expression profiling\",\n      \"pmids\": [\"28339476\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism linking DSC2 overexpression to desmosomal protein downregulation unknown\", \"Inflammatory signaling pathway not fully delineated\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"A DSC2 G790del knock-in mouse model revealed mild left ventricular dysfunction with prolonged and spontaneous Ca2+ transients but no overt ARVC pathology — indicating that DSC2 dysfunction directly perturbs cardiomyocyte calcium homeostasis but may require additional hits for full disease penetrance.\",\n      \"evidence\": \"Knock-in mouse model, echocardiography, isolated cardiomyocyte Ca2+ imaging and cell shortening assays\",\n      \"pmids\": [\"31872082\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Second-hit or modifier genes not tested\", \"Mechanism linking DSC2 to calcium channel/transporter regulation not identified\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"A DSC2 frameshift mutation (p.Q638LfsX647) was shown to cause loss of membrane DSC2 via both nonsense-mediated mRNA decay and aberrant extracellular secretion of truncated protein — defining two distinct cellular mechanisms by which truncating DSC2 mutations deplete functional protein at intercalated discs.\",\n      \"evidence\": \"qRT-PCR, Western blot, immunohistochemistry, TEM, immunoprecipitation in iPSC-derived cardiomyocytes and HT-1080 cells\",\n      \"pmids\": [\"32201174\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether secreted truncated DSC2 has dominant-negative extracellular effects not tested\", \"Generalizability to other DSC2 truncation mutations not established\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Patient-derived hiPSC-cardiomyocytes carrying a DSC2 missense mutation showed shortened action potentials, reduced Ca2+ current, increased K+ current, and abnormal Ca2+ sparks — directly linking DSC2 mutation to specific ion channel dysfunction and identifying flecainide and sotalol as partial pharmacological correctors.\",\n      \"evidence\": \"hiPSC-CM patch clamp electrophysiology, Ca2+ imaging, zebrafish DSC2 model, antiarrhythmic drug testing\",\n      \"pmids\": [\"33784018\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct physical interaction between DSC2 and ion channels not demonstrated\", \"Whether drug effects are DSC2-specific or generic antiarrhythmic actions not resolved\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"DSC2 and PKP1 were shown to promote cancer cell cluster survival under fluid shear stress via PI3K/AKT/Bcl-2 signaling and vimentin-dependent metastatic signaling — extending DSC2's role beyond structural adhesion to pro-survival and pro-metastatic signaling in circulating tumor cell clusters.\",\n      \"evidence\": \"Microfluidic selection, knockdown/overexpression, Western blot, mouse metastasis assays\",\n      \"pmids\": [\"34586853\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct DSC2-PI3K physical interaction not shown\", \"Relative contribution of DSC2 vs PKP1 not separated\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Co-immunoprecipitation established that DSC2 physically binds γ-catenin and restricts its nuclear translocation, modulating PTEN/PI3K/AKT and BCL-2/P53 apoptotic balance in gastric cancer cells — providing the first direct interaction partner linking DSC2's cytoplasmic domain to Wnt/catenin and PI3K signaling suppression.\",\n      \"evidence\": \"Co-IP, Western blot, immunofluorescence, PI3K inhibitor/activator rescue, xenograft mouse model, caspase-3 activity assay\",\n      \"pmids\": [\"37421607\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Reciprocal Co-IP from γ-catenin side not shown in this study\", \"Whether the DSC2-γ-catenin interaction is direct or mediated by plakophilins not resolved\", \"Applicability beyond gastric cancer not tested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The mechanism by which DSC2 cytoplasmic domain signals to ion channels in cardiomyocytes remains unknown, as does whether the a and b isoforms have distinct adhesive or signaling functions, and whether DSC2's tumor-suppressive role in epithelial cancers operates through the same γ-catenin interaction identified in gastric cancer across other tissue contexts.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structural model of DSC2 cytoplasmic domain–partner complexes exists\", \"Isoform-specific functional studies not performed\", \"No genome-wide screen for DSC2 signaling effectors published\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098631\", \"supporting_discovery_ids\": [0, 1, 4, 6]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [4, 6]},\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [6]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1500931\", \"supporting_discovery_ids\": [0, 4, 5, 6]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [8, 10]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [10]}\n    ],\n    \"complexes\": [\n      \"desmosome\"\n    ],\n    \"partners\": [\n      \"JUP\",\n      \"PKP1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"DSC2 encodes desmocollin-2, the most ubiquitously expressed desmosomal cadherin, which forms obligate heterophilic adhesive dimers with desmogleins through a strand-swap mechanism in which conserved charged residues in the ectodomain suppress homophilic Dsc:Dsc binding and promote heterophilic Dsg:Dsc assembly, establishing the fundamental adhesive unit of desmosomes [PMID:27298358, PMID:7750520]. DSC2 anchors to the desmosomal plaque through direct interactions of its cytoplasmic tail with plakophilin-2 and plakophilin-3, which are mediated by the head domains of these armadillo-repeat proteins [PMID:11790773, PMID:12707304]. Truncating and splice-site mutations in DSC2 cause arrhythmogenic cardiomyopathy by reducing membrane-localized protein, disrupting intercalated disc ultrastructure, and impairing cardiomyocyte calcium handling, while cardiac-specific overexpression likewise causes biventricular cardiomyopathy with necrosis and fibrosis, demonstrating that precise DSC2 dosage is essential for intercalated disc homeostasis [PMID:17033975, PMID:17186466, PMID:32201174, PMID:28339476]. In epithelial cancers, DSC2 suppresses invasion by sequestering γ-catenin from the nucleus to modulate PTEN/PI3K/AKT and apoptotic signaling [PMID:37421607, PMID:33204158].\",\n  \"teleology\": [\n    {\n      \"year\": 1994,\n      \"claim\": \"Establishing DSC2 as a cadherin-family desmosomal adhesion molecule with two alternatively spliced isoforms resolved the gene's domain architecture and set the stage for understanding its role in intercellular adhesion.\",\n      \"evidence\": \"cDNA cloning, sequencing, Northern blot, and in situ hybridization in mouse tissues and embryos\",\n      \"pmids\": [\"7711832\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Protein-level confirmation of isoform expression not yet performed\", \"Functional difference between Dsc2a and Dsc2b isoforms unknown\"]\n    },\n    {\n      \"year\": 1995,\n      \"claim\": \"Demonstrating that DSC2 is the only desmocollin expressed in all desmosome-bearing tissues (including myocardium) explained why it would later prove non-redundant in the heart.\",\n      \"evidence\": \"Northern blot and RNase protection assays across diverse human tissues and cell lines\",\n      \"pmids\": [\"7750520\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Protein-level quantification across tissues not performed\", \"Functional consequence of ubiquitous expression versus tissue-restricted DSC1/DSC3 not tested\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Mapping the DSC2 gene structure and defining its minimal promoter established the regulatory framework for its ubiquitous epithelial expression, revealing CpG-island-driven, TATA-less transcription with AP-2 and Sp-1 sites.\",\n      \"evidence\": \"Exon-intron mapping by PCR/Southern blot, promoter deletion analysis in transfected epithelial cells\",\n      \"pmids\": [\"9325054\", \"9074502\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo promoter regulation and chromatin context not examined\", \"Transcription factors driving cardiac-specific expression not identified\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Identifying plakophilin-2 and subsequently plakophilin-3 as direct binding partners of DSC2a defined the molecular links connecting the desmosomal cadherin to the intracellular plaque.\",\n      \"evidence\": \"Yeast two-hybrid, co-immunoprecipitation, and colocalization immunofluorescence in multiple cell types\",\n      \"pmids\": [\"11790773\", \"12707304\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Binding affinities and stoichiometry not quantified\", \"Whether Dsc2b binds PKP2/PKP3 equivalently is untested\", \"Structural basis of the DSC2–plakophilin interaction unknown\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"The discovery that DSC2 truncation and splice-site mutations cause arrhythmogenic right ventricular cardiomyopathy (ARVC) established DSC2 as a disease gene and proved desmosomal adhesion is essential for cardiac integrity.\",\n      \"evidence\": \"Sequencing of ARVC probands identifying heterozygous frameshift mutations; zebrafish dsc2 morpholino knockdown showing reduced desmosomal plaque area and contractility defects by electron microscopy\",\n      \"pmids\": [\"17033975\", \"17186466\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism linking desmosome disruption to arrhythmogenesis not defined\", \"Haploinsufficiency versus dominant-negative mechanism not distinguished\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Characterization of a homozygous DSC2 truncation in patient tissue and recombinant cells showed that the processed DSC2 protein, not merely transcript presence, is required at the intercalated disc for desmosome integrity.\",\n      \"evidence\": \"Immunohistochemistry of endomyocardial biopsies, recombinant protein expression and subcellular localization in cultured cells\",\n      \"pmids\": [\"23863954\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether the truncated protein exerts a dominant-negative effect or is simply non-functional unclear\", \"Desmosome assembly kinetics not measured\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Crystal structures of DSC2 ectodomains revealed that conserved charged residues enforce heterophilic Dsg:Dsc strand-swap dimerization while preventing Dsc:Dsc homodimerization, solving a long-standing question about desmosomal adhesion specificity.\",\n      \"evidence\": \"X-ray crystallography of Dsc1 and Dsc2 ectodomains, analytical ultracentrifugation, coated-bead aggregation assays\",\n      \"pmids\": [\"27298358\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full-length Dsg:Dsc heterodimer structure not solved\", \"How cis- versus trans-interactions are coordinated in the intact desmosome remains unclear\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Cardiac-specific DSC2 overexpression in mice caused biventricular cardiomyopathy with necrosis and fibrosis, proving that DSC2 protein dosage—not just loss—is critical for intercalated disc homeostasis.\",\n      \"evidence\": \"Transgenic mouse model with echocardiography, histology, immunohistochemistry, and gene expression profiling\",\n      \"pmids\": [\"28339476\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which excess DSC2 triggers necrosis and inflammation not identified\", \"Whether overexpression disrupts Dsg:Dsc stoichiometry directly was not tested\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"A DSC2 G790del knock-in mouse demonstrated that specific mutations impair cardiomyocyte calcium handling (prolonged Ca²⁺ transients, increased spontaneous Ca²⁺ events) without causing overt ARVC structural remodeling, revealing mutation-specific pathomechanisms.\",\n      \"evidence\": \"Knock-in mouse, echocardiography, isolated cardiomyocyte Ca²⁺ transient measurements with isoproterenol challenge\",\n      \"pmids\": [\"31872082\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism linking DSC2 mutation to altered Ca²⁺ handling not elucidated\", \"Long-term arrhythmia susceptibility in these mice not assessed\", \"Single mutation studied; generalizability to other missense variants unknown\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"iPSC-derived cardiomyocyte and ultrastructural studies of a homozygous DSC2 deletion demonstrated that truncated DSC2 protein is secreted rather than membrane-localized, causing intercalated disc widening and confirming that membrane targeting is essential for function.\",\n      \"evidence\": \"iPSC-CM differentiation, Western blot, immunohistochemistry, transmission electron microscopy of explanted myocardium\",\n      \"pmids\": [\"32201174\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether secreted truncated DSC2 has any extracellular signaling effect is unknown\", \"Rescue experiments restoring wild-type DSC2 in patient iPSC-CMs not performed\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Patient iPSC-CM electrophysiology revealed that a DSC2 missense mutation shortens action potential duration via reduced Ca²⁺ current and increased K⁺ current, and that flecainide and sotalol can partially normalize these defects, establishing a myogenic origin of ACM-related electrical instability.\",\n      \"evidence\": \"Patch-clamp electrophysiology, Ca²⁺ imaging, and antiarrhythmic drug testing in patient-derived iPSC-CMs; zebrafish dsc2 morpholino model\",\n      \"pmids\": [\"33784018\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct molecular link between DSC2 and ion channel remodeling not identified\", \"Findings from single patient line; replication in additional mutation carriers needed\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"In cancer contexts, DSC2 was shown to suppress tumor cell viability by binding γ-catenin and preventing its nuclear translocation, thereby modulating PTEN/PI3K/AKT signaling and promoting apoptosis, extending DSC2 function beyond structural adhesion.\",\n      \"evidence\": \"Co-immunoprecipitation, immunofluorescence, Western blot, PI3K inhibitor/activator experiments, and mouse xenograft in gastric cancer cells\",\n      \"pmids\": [\"37421607\", \"33204158\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether γ-catenin sequestration is a direct stoichiometric effect or involves additional intermediates is unresolved\", \"Relevance of this signaling axis in non-cancer, non-cardiac tissues not examined\", \"Retracted BRD4-related finding (PMID:36120591) leaves the nuclear BRD4 mechanism unconfirmed\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the structural basis of DSC2 interactions with plakophilins and plakoglobin, the direct molecular mechanism linking DSC2 dysfunction to ion channel remodeling and calcium mishandling in cardiomyocytes, and whether the two DSC2 splice isoforms have distinct functional roles.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No high-resolution structure of DSC2 cytoplasmic domain in complex with plaque proteins\", \"Mechanism coupling desmosome disruption to ion channel/Ca²⁺ handling changes undefined\", \"Functional distinction between Dsc2a and Dsc2b isoforms never tested\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098631\", \"supporting_discovery_ids\": [0, 1, 8]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [8, 9, 11]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [4, 5, 9, 11]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1500931\", \"supporting_discovery_ids\": [4, 5, 8]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [6, 7, 9, 11]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [15, 17]}\n    ],\n    \"complexes\": [\n      \"desmosome\"\n    ],\n    \"partners\": [\n      \"PKP2\",\n      \"PKP3\",\n      \"DSG1\",\n      \"DSG2\",\n      \"JUP\",\n      \"DSP\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}