{"gene":"CLDN7","run_date":"2026-04-28T17:28:52","timeline":{"discoveries":[{"year":1999,"finding":"CLDN7 (claudin-7) was identified as a member of the claudin multigene family encoding four-transmembrane domain proteins. When HA-tagged CLDN7 was introduced into MDCK cells, it concentrated at tight junctions, establishing its role as a structural TJ component with tissue-specific expression.","method":"Transfection of HA-tagged constructs into MDCK cells, immunofluorescence and immunoelectron microscopy, Northern blotting","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — direct localization experiment in cultured cells, foundational paper, widely replicated","pmids":["9892664"],"is_preprint":false},{"year":1999,"finding":"ZO-1, ZO-2, and ZO-3 directly bind the COOH-terminal YV sequence of claudin-7 (and claudins 1–8) through their PDZ1 domains in vitro, establishing the molecular scaffold connecting claudins to cytoplasmic TJ plaque proteins.","method":"In vitro binding assay (PDZ domain pulldowns), transfection into L fibroblasts, co-recruitment of ZO proteins to claudin-based networks","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1 — in vitro reconstituted binding assay plus cellular validation, replicated across claudin family members","pmids":["10601346"],"is_preprint":false},{"year":2003,"finding":"CLDN7 expression is lost in high-grade invasive ductal carcinoma of the breast; loss correlated with promoter hypermethylation in breast cancer cell lines. Treatment of MCF-7/T47D cells with HGF/scatter factor caused loss of CLDN7 expression within 24 h, linking HGF signaling to CLDN7 downregulation.","method":"RT-PCR, Western blot, IHC, methylation-specific PCR, nucleotide sequencing, HGF treatment of cell lines","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 — multiple orthogonal methods in one study; promoter methylation and HGF-induced loss shown but not further mechanistically dissected","pmids":["12673207"],"is_preprint":false},{"year":2005,"finding":"CLDN7 directly interacts with the cell-cell adhesion molecule EpCAM. Co-immunoprecipitation after membrane-permeable chemical cross-linking demonstrated direct protein-protein interaction. The EpCAM–CLDN7 complex is located in glycolipid-enriched membrane microdomains (lipid rafts), and CLDN7 phosphorylation is restricted to this raft-localized pool.","method":"Co-immunoprecipitation with chemical cross-linker, sucrose density gradient fractionation for lipid raft isolation, immunofluorescence co-localization","journal":"Experimental cell research","confidence":"High","confidence_rationale":"Tier 1–2 — direct cross-linking co-IP establishes protein–protein interaction; lipid raft fractionation links localization to phosphorylation state","pmids":["16054130"],"is_preprint":false},{"year":2007,"finding":"CLDN7 is an essential scaffold for assembly of the EpCAM/CLDN7/CO-029/CD44v6 complex in tetraspanin-enriched membrane microdomains (TEMs) in colorectal cancer. In the absence of CLDN7, EpCAM fails to associate with CO-029 and CD44v6 and is not recruited into TEMs; presence of the complex confers apoptosis resistance to tumor cells.","method":"Co-immunoprecipitation, siRNA knockdown of CLDN7, sucrose gradient fractionation of TEMs, apoptosis assays in cell lines expressing or lacking complex components","journal":"Molecular cancer research : MCR","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP combined with CLDN7 knockdown demonstrating loss of complex assembly and functional apoptosis phenotype","pmids":["17579117"],"is_preprint":false},{"year":2007,"finding":"Structure-function analysis of claudins established that the first extracellular loop (ECL1) of claudins, including CLDN7, determines paracellular tightness and selective ion permeability, while the shorter second ECL mediates narrowing of the paracellular cleft and trans-interactions between opposing membranes.","method":"Sequence analysis, molecular modeling, mutagenesis-based functional inference across claudin family","journal":"Biochimica et biophysica acta","confidence":"Medium","confidence_rationale":"Tier 3 — structure-function inferred from sequence analysis and comparative data; direct mutagenesis of CLDN7 ECL not isolated in this paper","pmids":["18036336"],"is_preprint":false},{"year":2010,"finding":"Residues 32 and 48 in the first extracellular loop of CLDN7 are critical for CD81 association and HCV receptor activity. Wild-type CLDN7 does not associate with CD81 and lacks HCV receptor activity; mutation of residues 32 and 48 in CLDN7 to match CLDN1 enabled CD81 complex formation and supported virus entry, demonstrating that ECL1 residues determine CLDN–CD81 interaction specificity.","method":"FRET and stoichiometric imaging of claudin–CD81 complexes, site-directed mutagenesis of CLDN7 ECL1 residues 32 and 48, HCV pseudoparticle entry assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — mutagenesis with functional rescue, FRET-based interaction quantification, and viral entry assay in one study","pmids":["20375010"],"is_preprint":false},{"year":2021,"finding":"Intestinal conditional knockout of Cldn-7 (Cldn7fl/fl;villin-CreERT2 mice) destroys tight junction integrity, increases intercellular permeability, exacerbates colitis, and promotes colitis-associated colorectal cancer with activation of the Wnt/β-catenin signaling pathway, establishing that Cldn-7 is required for intestinal homeostasis and suppresses Wnt/β-catenin-driven proliferation.","method":"Inducible intestinal epithelial Cldn-7 conditional knockout mice, AOM/DSS colitis-cancer model, FITC-dextran permeability assay, immunofluorescence of TJ proteins, Western blot for β-catenin pathway components","journal":"Oncoimmunology","confidence":"High","confidence_rationale":"Tier 2 — in vivo conditional KO with defined molecular pathway (Wnt/β-catenin) and permeability readout; multiple orthogonal methods","pmids":["34026335"],"is_preprint":false},{"year":2024,"finding":"Intestinal Cldn-7 knockout alters gut microbiota composition (diversity and functional profiles). Antibiotic-mediated microbiota depletion reduced the intestinal inflammation caused by Cldn-7 deficiency, and co-housing experiments transferred the inflammatory phenotype via microbiota transfer, establishing Cldn-7 as a regulator of host–microbiome interactions that prevents inflammation partly through maintaining microbiota homeostasis.","method":"Cldn-7 conditional KO mice, 16S rRNA amplicon sequencing, antibiotic depletion model, co-housing experiments, DSS colitis model, qRT-PCR of inflammatory factors and antimicrobial peptides, AB-PAS staining","journal":"Pathology, research and practice","confidence":"Medium","confidence_rationale":"Tier 2 — genetic KO with microbiota sequencing and mechanistic depletion/rescue experiments; single lab","pmids":["39004000"],"is_preprint":false},{"year":2025,"finding":"ACSS2-mediated histone H4 lysine 12 crotonylation (H4K12cr) directly upregulates CLDN7 transcription to reinforce intestinal epithelial barrier integrity. TNF-α promotes m6A modification of ACSS2 mRNA, destabilizing ACSS2 and reducing H4K12cr, which decreases CLDN7 expression. Crotonate supplementation restored H4K12cr and CLDN7 levels and ameliorated colitis, establishing a TNF-α → m6A-ACSS2 → H4K12cr → CLDN7 regulatory axis.","method":"Genetic/pharmacologic ACSS2 inhibition in mice and intestinal epithelial cells, ChIP-seq for H4K12cr at CLDN7 locus, m6A sequencing of ACSS2 mRNA, TEER and permeability assays, crotonate supplementation rescue experiments","journal":"Advanced science (Weinheim, Baden-Wurttemberg, Germany)","confidence":"High","confidence_rationale":"Tier 1–2 — ChIP-seq demonstrating H4K12cr at CLDN7 locus, genetic KO, m6A sequencing, and functional rescue with multiple orthogonal methods","pmids":["40650658"],"is_preprint":false},{"year":2020,"finding":"miR-1193 directly targets CLDN7 mRNA in cervical cancer cells; luciferase reporter assay confirmed binding, and restoration of CLDN7 in miR-1193-overexpressing cells rescued proliferation, invasion, and migration, establishing CLDN7 as a functional downstream effector of miR-1193-mediated tumor suppression.","method":"Luciferase reporter assay, qRT-PCR, Western blot, CCK-8 proliferation assay, transwell invasion/migration assay, rescue overexpression of CLDN7","journal":"OncoTargets and therapy","confidence":"Medium","confidence_rationale":"Tier 2 — direct 3'UTR luciferase validation plus rescue experiment; single lab","pmids":["32547067"],"is_preprint":false},{"year":2025,"finding":"HNF4α and HNF4γ are primary transcriptional regulators of CLDN7 (along with other TJ genes). Combined knockout of Hnf4α/γ in mice repressed Cldn7 and other TJ genes, impaired epithelial barrier function via both pore and leak pathways, and this was phenocopied in Crohn's disease patient-derived organoids. Pharmacologic HNF4 agonists (NCT, NFT) restored TJ gene expression including Cldn7 and rescued barrier function.","method":"Hnf4α/γ double knockout mice, transcriptomic analysis, FITC-dextran flux, TEER measurement in organoids, HNF4 agonist treatment of CD patient-derived organoids and Tnf-ΔARE/+ mouse organoids","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 — genetic KO transcriptomics + functional barrier assays + pharmacologic rescue; preprint, not yet peer-reviewed","pmids":["bio_10.1101_2025.10.27.684895"],"is_preprint":true}],"current_model":"CLDN7 is a four-transmembrane tight junction protein whose C-terminal YV motif binds ZO-1/2/3 PDZ1 domains to anchor it to the TJ scaffold; it directly interacts with EpCAM (requiring lipid raft localization where CLDN7 phosphorylation occurs) and serves as an obligate scaffold for EpCAM/CO-029/CD44v6 complex assembly in tetraspanin-enriched microdomains, conferring apoptosis resistance; specific ECL1 residues (32 and 48) determine its inability to engage CD81 (unlike CLDN1); its transcription is positively regulated by HNF4α/γ and by ACSS2-mediated H4K12 crotonylation (suppressed by TNF-α via m6A-dependent ACSS2 destabilization), while in vivo loss of CLDN7 disrupts TJ integrity, activates Wnt/β-catenin signaling, and promotes intestinal inflammation partly by dysregulating gut microbiota."},"narrative":{"teleology":[{"year":1999,"claim":"Establishing CLDN7 as a tight junction structural component resolved its basic subcellular role within the newly defined claudin family, and identification of direct PDZ1-mediated binding of ZO-1/2/3 to the claudin C-terminal YV motif revealed the molecular link between claudins and the cytoplasmic TJ plaque.","evidence":"HA-tagged CLDN7 transfection and immunolocalization in MDCK cells; in vitro PDZ domain pulldown assays and co-recruitment in L fibroblasts","pmids":["9892664","10601346"],"confidence":"High","gaps":["Stoichiometry of ZO–CLDN7 complexes not determined","Contribution of CLDN7 to paracellular ion selectivity not isolated from other claudins","Post-translational regulation of the YV–PDZ interaction unknown"]},{"year":2005,"claim":"Discovery that CLDN7 directly associates with EpCAM in lipid rafts, with phosphorylation restricted to this raft-localized pool, expanded CLDN7 function beyond canonical TJ sealing to adhesion-signaling scaffolding in specialized membrane domains.","evidence":"Co-immunoprecipitation with membrane-permeable cross-linker, sucrose density gradient lipid raft fractionation, immunofluorescence co-localization","pmids":["16054130"],"confidence":"High","gaps":["Kinase responsible for raft-restricted CLDN7 phosphorylation unidentified","Phosphorylation site(s) on CLDN7 not mapped","Whether EpCAM binding requires CLDN7 phosphorylation not tested"]},{"year":2007,"claim":"Demonstrating that CLDN7 is the obligate scaffold for EpCAM/CO-029/CD44v6 complex assembly in tetraspanin-enriched microdomains, and that this complex confers apoptosis resistance, established a non-TJ oncogenic function for CLDN7.","evidence":"Reciprocal co-IP with CLDN7 siRNA knockdown in colorectal cancer cells, sucrose gradient TEM fractionation, apoptosis assays","pmids":["17579117"],"confidence":"High","gaps":["Direct binding interfaces between CLDN7 and CO-029/CD44v6 not mapped","Whether scaffold function operates in non-cancerous epithelia unknown","Downstream apoptosis resistance mechanism not fully delineated"]},{"year":2010,"claim":"Identification of ECL1 residues 32 and 48 as determinants of CLDN7's inability to associate with CD81 (and consequent lack of HCV receptor activity) provided the first residue-level functional map of CLDN7's extracellular loop specificity.","evidence":"FRET-based stoichiometric imaging, site-directed mutagenesis of CLDN7 ECL1, HCV pseudoparticle entry assay","pmids":["20375010"],"confidence":"High","gaps":["Full structural basis of ECL1 selectivity unresolved—no crystal or cryo-EM structure of CLDN7","Whether residues 32/48 influence paracellular selectivity not tested","Trans-interaction partners of CLDN7 ECL2 not identified"]},{"year":2021,"claim":"Intestinal conditional knockout of Cldn7 proved it is required in vivo for TJ integrity and intestinal homeostasis, and revealed that its loss activates Wnt/β-catenin signaling to promote colitis-associated tumorigenesis, linking barrier failure to a specific oncogenic pathway.","evidence":"Inducible villin-CreERT2 Cldn7 conditional KO mice, AOM/DSS model, FITC-dextran permeability, immunofluorescence, Western blot for β-catenin","pmids":["34026335"],"confidence":"High","gaps":["Direct mechanism by which CLDN7 loss activates Wnt/β-catenin not established","Whether CLDN7 physically interacts with Wnt pathway components not tested","Relative contribution of barrier leak versus CLDN7 signaling to tumorigenesis not separated"]},{"year":2024,"claim":"The finding that CLDN7-deficient intestinal inflammation is partly mediated by dysregulated gut microbiota—transferable by co-housing and reversible by antibiotics—added a host-microbiome axis to CLDN7's barrier-protective function.","evidence":"Cldn7 conditional KO mice, 16S rRNA sequencing, antibiotic depletion, co-housing transfer of inflammatory phenotype","pmids":["39004000"],"confidence":"Medium","gaps":["Specific microbial species or metabolites driving inflammation not identified","Whether microbiota changes are secondary to barrier leak or CLDN7-specific signaling unclear","Single-lab finding awaiting independent replication"]},{"year":2025,"claim":"Identification of the TNF-α → m6A-ACSS2 → H4K12 crotonylation → CLDN7 transcriptional axis provided the first chromatin-level regulatory mechanism for CLDN7 expression and a pharmacologically targetable node (crotonate) for barrier restoration in colitis.","evidence":"ChIP-seq for H4K12cr at the CLDN7 locus, ACSS2 genetic/pharmacologic inhibition, m6A sequencing of ACSS2 mRNA, TEER and permeability assays, crotonate rescue in mice and intestinal epithelial cells","pmids":["40650658"],"confidence":"High","gaps":["Whether other histone acylation marks cooperate with H4K12cr at the CLDN7 promoter not explored","Identity of the m6A reader destabilizing ACSS2 mRNA not determined","Relevance to extra-intestinal epithelia not tested"]},{"year":null,"claim":"No high-resolution structure of CLDN7 exists, the direct mechanism linking CLDN7 loss to Wnt/β-catenin activation is unknown, and the functional significance of raft-restricted CLDN7 phosphorylation remains undefined.","evidence":"","pmids":[],"confidence":"High","gaps":["No cryo-EM or crystal structure of CLDN7","Phosphorylation sites and responsible kinases uncharacterized","Whether CLDN7 directly modulates Wnt pathway components or acts indirectly via barrier disruption is unresolved"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098631","term_label":"cell adhesion mediator activity","supporting_discovery_ids":[0,1,3,4,7]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[0,1,7]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[3,4]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,3,4,6]}],"pathway":[{"term_id":"R-HSA-1500931","term_label":"Cell-Cell communication","supporting_discovery_ids":[0,1,3,4,7]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[7]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[4,7]}],"complexes":["EpCAM/CLDN7/CO-029/CD44v6 tetraspanin-enriched microdomain complex"],"partners":["TJP1","TJP2","TJP3","EPCAM","TSPAN8","CD44"],"other_free_text":[]},"mechanistic_narrative":"CLDN7 is a four-transmembrane tight junction protein that maintains epithelial barrier integrity and participates in cell-cell adhesion signaling. Its C-terminal YV motif directly binds the PDZ1 domains of ZO-1, ZO-2, and ZO-3, anchoring it to the cytoplasmic tight junction scaffold [PMID:10601346]. Beyond canonical TJ function, CLDN7 directly interacts with EpCAM in glycolipid-enriched membrane microdomains and serves as an obligate scaffold for assembly of the EpCAM/CO-029/CD44v6 complex in tetraspanin-enriched microdomains, conferring apoptosis resistance in colorectal cancer cells [PMID:16054130, PMID:17579117]. In vivo, intestinal loss of CLDN7 disrupts paracellular barrier integrity, activates Wnt/β-catenin signaling to promote colitis-associated tumorigenesis, and dysregulates gut microbiota composition, while its transcription is positively regulated by ACSS2-mediated H4K12 crotonylation, a pathway suppressed by TNF-α through m6A-dependent ACSS2 mRNA destabilization [PMID:34026335, PMID:39004000, PMID:40650658]."},"prefetch_data":{"uniprot":{"accession":"O95471","full_name":"Claudin-7","aliases":[],"length_aa":211,"mass_kda":22.4,"function":"Plays a major role in tight junction-specific obliteration of the intercellular space","subcellular_location":"Cell membrane; Basolateral cell membrane; Cell junction, tight junction","url":"https://www.uniprot.org/uniprotkb/O95471/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CLDN7","classification":"Not Classified","n_dependent_lines":12,"n_total_lines":1208,"dependency_fraction":0.009933774834437087},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/CLDN7","total_profiled":1310},"omim":[{"mim_id":"609131","title":"CLAUDIN 7; CLDN7","url":"https://www.omim.org/entry/609131"},{"mim_id":"603718","title":"CLAUDIN 1; CLDN1","url":"https://www.omim.org/entry/603718"},{"mim_id":"602910","title":"CLAUDIN 3; CLDN3","url":"https://www.omim.org/entry/602910"},{"mim_id":"602909","title":"CLAUDIN 4; CLDN4","url":"https://www.omim.org/entry/602909"},{"mim_id":"602101","title":"CLAUDIN 5; CLDN5","url":"https://www.omim.org/entry/602101"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Vesicles","reliability":"Approved"},{"location":"Cell Junctions","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"esophagus","ntpm":324.6},{"tissue":"intestine","ntpm":321.6}],"url":"https://www.proteinatlas.org/search/CLDN7"},"hgnc":{"alias_symbol":["Hs.84359"],"prev_symbol":["CEPTRL2","CPETRL2"]},"alphafold":{"accession":"O95471","domains":[{"cath_id":"1.20.140.150","chopping":"1-30_75-183","consensus_level":"high","plddt":90.2201,"start":1,"end":183}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O95471","model_url":"https://alphafold.ebi.ac.uk/files/AF-O95471-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O95471-F1-predicted_aligned_error_v6.png","plddt_mean":82.62},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CLDN7","jax_strain_url":"https://www.jax.org/strain/search?query=CLDN7"},"sequence":{"accession":"O95471","fasta_url":"https://rest.uniprot.org/uniprotkb/O95471.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O95471/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O95471"}},"corpus_meta":[{"pmid":"34026335","id":"PMC_34026335","title":"Cldn-7 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pathology","url":"https://pubmed.ncbi.nlm.nih.gov/26319240","citation_count":116,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"18349130","id":"PMC_18349130","title":"A key claudin extracellular loop domain is critical for epithelial barrier integrity.","date":"2008","source":"The American journal of pathology","url":"https://pubmed.ncbi.nlm.nih.gov/18349130","citation_count":102,"is_preprint":false,"source_track":"gene2pubmed"}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":9503,"output_tokens":1876,"usd":0.028324},"stage2":{"model":"claude-opus-4-6","input_tokens":5181,"output_tokens":2343,"usd":0.12672},"total_usd":0.367156,"stage1_batch_id":"msgbatch_011kfMfE81o6CTcyhVUqumuW","stage2_batch_id":"msgbatch_01DTputS6WNkH745x1nVSoBo","note":"batch pricing = 50% of standard","round2_stage1":{"model":"claude-sonnet-4-6","input_tokens":22503,"output_tokens":4354,"usd":0.066409},"round2_rules_fired":"R3","round2_stage2":{"model":"claude-opus-4-6","input_tokens":7092,"output_tokens":2467,"usd":0.145703}},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2021,\n      \"finding\": \"Intestinal conditional knockout of Cldn-7 in mice (Cldn7fl/fl;villin-CreERT2) disrupts tight junction integrity, increases intercellular permeability, promotes colitis, and activates Wnt/β-catenin signaling during colitis-associated carcinogenesis, establishing CLDN7 as a maintainer of intestinal epithelial barrier function and suppressor of Wnt-driven malignant transformation.\",\n      \"method\": \"Inducible intestinal conditional knockout mouse model (Cldn7fl/fl;villin-CreERT2) with AOM/DSS colitis-cancer model; FITC-dextran permeability assay; immunostaining for Wnt/β-catenin pathway components; histopathology\",\n      \"journal\": \"Oncoimmunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean conditional KO with defined cellular and molecular phenotypes, multiple orthogonal readouts\",\n      \"pmids\": [\"34026335\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Cldn-7 deficiency in intestinal epithelial cells alters gut microbiota composition (diversity and abundance), and antibiotic-mediated depletion of gut flora reduces the intestinal inflammation caused by Cldn-7 loss, placing Cldn-7 upstream of host-microbiome interactions that modulate intestinal inflammation.\",\n      \"method\": \"Inducible intestinal Cldn-7 knockout mice (Cldn7fl/fl;villin-CreERT2); antibiotic drinking model; co-housing experiment; 16S rRNA amplicon sequencing; AB-PAS staining; qRT-PCR for inflammatory factors and AMPs\",\n      \"journal\": \"Pathology, research and practice\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with defined phenotype and microbiome readout, single lab\",\n      \"pmids\": [\"39004000\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"ACSS2-mediated histone H4 lysine 12 crotonylation (H4K12cr) upregulates CLDN7 transcription to fortify the intestinal epithelial barrier; TNF-α enhances m6A modification of ACSS2 mRNA, destabilizing ACSS2 and thereby reducing H4K12cr and CLDN7 expression, linking an epigenetic writer to CLDN7 transcriptional regulation.\",\n      \"method\": \"Genetic and pharmacological inhibition of ACSS2 in mice; crotonate supplementation; chromatin/epigenetic assays for H4K12cr; m6A modification analysis of ACSS2 mRNA; intestinal barrier integrity assays; qRT-PCR and Western blot for CLDN7\",\n      \"journal\": \"Advanced science (Weinheim, Baden-Wurttemberg, Germany)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — mechanistic pathway with epigenetic writer identified, multiple methods, single lab\",\n      \"pmids\": [\"40650658\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"The lncRNA DDX11-AS1 acts as a competing endogenous RNA (ceRNA) by binding miR-873, preventing miR-873-mediated degradation of CLDN7 mRNA, thereby upregulating CLDN7 protein and promoting colorectal cancer cell proliferation, migration, and invasion.\",\n      \"method\": \"ChIP assay; luciferase reporter assay; siRNA knockdown; rescue experiments; qRT-PCR and Western blot; functional cell assays (proliferation, migration, invasion)\",\n      \"journal\": \"European review for medical and pharmacological sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — luciferase reporter and rescue experiments validate ceRNA mechanism, single lab\",\n      \"pmids\": [\"31298324\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"miR-1193 directly targets the CLDN7 3′UTR, suppressing CLDN7 expression; restoration of CLDN7 rescues cervical cancer cell proliferation, invasion, and migration inhibited by miR-1193 overexpression, establishing CLDN7 as a direct functional target of miR-1193 in cervical cancer.\",\n      \"method\": \"Luciferase reporter assay; qRT-PCR; Western blot; CCK-8, transwell, and wound healing assays; rescue experiments\",\n      \"journal\": \"OncoTargets and therapy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — luciferase reporter validation plus functional rescue, single lab\",\n      \"pmids\": [\"32547067\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"HNF4α/γ transcription factors directly regulate CLDN7 (and other tight junction genes) transcription in intestinal epithelial cells; combined loss of Hnf4α/γ represses Cldn7 expression and impairs epithelial barrier function, while pharmacologic HNF4 activation restores Cldn7 expression and barrier integrity.\",\n      \"method\": \"Hnf4α/γ double knockout mice; transcriptomic analysis; FITC-dextran flux and TEER assays; patient-derived organoids; TNF overexpression mouse model; pharmacologic HNF4 agonist treatment\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO with transcriptomic and functional barrier readouts, preprint not yet peer-reviewed\",\n      \"pmids\": [\"bio_10.1101_2025.10.27.684895\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Overexpression and knockdown experiments in gastric cancer cells demonstrate that CLDN7 promotes cancer cell proliferation, invasion, and maintenance of the mesenchymal state (epithelial-mesenchymal transition), indicating an oncogenic function in this context.\",\n      \"method\": \"CLDN7 overexpression and siRNA knockdown in gastric cancer cell lines; proliferation, invasion, and EMT marker assays\",\n      \"journal\": \"Neoplasma\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single lab, functional cell assays without clear pathway placement or mechanistic detail\",\n      \"pmids\": [\"29788731\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CLDN7 is a transmembrane tight junction protein that maintains intestinal epithelial barrier integrity and cell polarity; its transcription is regulated by HNF4α/γ and ACSS2-mediated H4K12 crotonylation, its mRNA is post-transcriptionally controlled by miR-873 (via the lncRNA DDX11-AS1 ceRNA axis) and miR-1193, and its loss disrupts tight junction integrity, increases paracellular permeability, dysregulates gut microbiota, and activates Wnt/β-catenin signaling to promote colitis and cancer progression.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\nI'll classify each paper first, then extract discoveries only from KEEP papers.\n\n**Classification:**\n- Papers [1], [3], [5] (Retrieved): KEEP — directly about CLDN7 protein function\n- Paper [2] (Retrieved): EXCLUDE — about lncRNA DDX11-AS1/miR-873 axis; CLDN7 is just a downstream target mentioned\n- Paper [5] (Retrieved, MiR-1193): KEEP — establishes CLDN7 as direct target of miR-1193 in cervical cancer\n- Paper [6] (Retrieved, GWAS): EXCLUDE — genetic variant/GWAS, no mechanistic finding about CLDN7 protein\n- Paper [7] (Retrieved): EXCLUDE — expression/prognostic study\n- Paper [8] (Retrieved): KEEP — ACSS2-mediated H4K12cr regulates CLDN7 transcription\n- Paper [9] (Retrieved): KEEP — Cldn-7 KO affects gut microbiota/inflammation\n- Paper [10] (Retrieved): EXCLUDE — about m6A methylation of CLDN7 mRNA by ginger, no direct protein mechanism\n- Paper [11] (Retrieved): EXCLUDE — review\n- Paper [12] (Preprint): KEEP — HNF4α/γ transcriptional regulation of Cldn7\n- Paper [13] (Preprint): EXCLUDE — TLR4 study; CLDN7 is incidental mRNA measurement\n- Additional [6] (Morita 1999, PMID 9892664): KEEP — foundational claudin family paper, establishes CLDN7 localizes to TJs\n- Additional [7] (Itoh 1999, PMID 10601346): KEEP — ZO-1/2/3 bind CLDN7 C-terminal YV via PDZ1\n- Additional [11] (Krause 2007, PMID 18036336): KEEP — structure-function of claudins including CLDN7\n- Additional [17] (Kominsky 2003, PMID 12673207): KEEP — CLDN7 loss in breast cancer, HGF-induced loss, methylation\n- Additional [21] (Kuhn 2007, PMID 17579117): KEEP — CLDN7/EpCAM/CD44v6/CO-029 complex formation\n- Additional [25] (Harris 2010, PMID 20375010): KEEP — CLDN7 residues 32/48 in EL1 critical for CD81 association\n- Additional [27] (Ladwein 2005, PMID 16054130): KEEP — direct EpCAM-CLDN7 interaction, phosphorylation in lipid rafts\n- Additional [2] (Tsukita 2001, PMID 11283726): KEEP — TJ structure/function review (foundational)\n- Additional [8], [9], [18], [19], [23], [24] etc.: general TJ/claudin family reviews or expression studies — limited specific CLDN7 mechanism; will extract where CLDN7-specific\n- Additional [24] (Oshima 2008, PMID 19120888): KEEP — claudin-4 and -7 down-regulated in UC (direct measurement)\n- Additional [1], [3], [4], [5], [9], [10], [12], [13], [14], [15], [22] (interactome maps, cDNA collections, autophagy screens): EXCLUDE — CLDN7 incidental\n- Additional [28] (Kirschner 2009, PMID 19661441): KEEP — CLDN7 down-regulation in psoriasis linked to cytokines\n- Additional [30] (Mrsny 2008, PMID 18349130): EXCLUDE — about claudin-1 EL domain, CLDN7 not studied\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1999,\n      \"finding\": \"CLDN7 (claudin-7) was identified as a member of the claudin multigene family encoding four-transmembrane domain proteins. When HA-tagged CLDN7 was introduced into MDCK cells, it concentrated at tight junctions, establishing its role as a structural TJ component with tissue-specific expression.\",\n      \"method\": \"Transfection of HA-tagged constructs into MDCK cells, immunofluorescence and immunoelectron microscopy, Northern blotting\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct localization experiment in cultured cells, foundational paper, widely replicated\",\n      \"pmids\": [\"9892664\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"ZO-1, ZO-2, and ZO-3 directly bind the COOH-terminal YV sequence of claudin-7 (and claudins 1–8) through their PDZ1 domains in vitro, establishing the molecular scaffold connecting claudins to cytoplasmic TJ plaque proteins.\",\n      \"method\": \"In vitro binding assay (PDZ domain pulldowns), transfection into L fibroblasts, co-recruitment of ZO proteins to claudin-based networks\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstituted binding assay plus cellular validation, replicated across claudin family members\",\n      \"pmids\": [\"10601346\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"CLDN7 expression is lost in high-grade invasive ductal carcinoma of the breast; loss correlated with promoter hypermethylation in breast cancer cell lines. Treatment of MCF-7/T47D cells with HGF/scatter factor caused loss of CLDN7 expression within 24 h, linking HGF signaling to CLDN7 downregulation.\",\n      \"method\": \"RT-PCR, Western blot, IHC, methylation-specific PCR, nucleotide sequencing, HGF treatment of cell lines\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods in one study; promoter methylation and HGF-induced loss shown but not further mechanistically dissected\",\n      \"pmids\": [\"12673207\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"CLDN7 directly interacts with the cell-cell adhesion molecule EpCAM. Co-immunoprecipitation after membrane-permeable chemical cross-linking demonstrated direct protein-protein interaction. The EpCAM–CLDN7 complex is located in glycolipid-enriched membrane microdomains (lipid rafts), and CLDN7 phosphorylation is restricted to this raft-localized pool.\",\n      \"method\": \"Co-immunoprecipitation with chemical cross-linker, sucrose density gradient fractionation for lipid raft isolation, immunofluorescence co-localization\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — direct cross-linking co-IP establishes protein–protein interaction; lipid raft fractionation links localization to phosphorylation state\",\n      \"pmids\": [\"16054130\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"CLDN7 is an essential scaffold for assembly of the EpCAM/CLDN7/CO-029/CD44v6 complex in tetraspanin-enriched membrane microdomains (TEMs) in colorectal cancer. In the absence of CLDN7, EpCAM fails to associate with CO-029 and CD44v6 and is not recruited into TEMs; presence of the complex confers apoptosis resistance to tumor cells.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown of CLDN7, sucrose gradient fractionation of TEMs, apoptosis assays in cell lines expressing or lacking complex components\",\n      \"journal\": \"Molecular cancer research : MCR\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP combined with CLDN7 knockdown demonstrating loss of complex assembly and functional apoptosis phenotype\",\n      \"pmids\": [\"17579117\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Structure-function analysis of claudins established that the first extracellular loop (ECL1) of claudins, including CLDN7, determines paracellular tightness and selective ion permeability, while the shorter second ECL mediates narrowing of the paracellular cleft and trans-interactions between opposing membranes.\",\n      \"method\": \"Sequence analysis, molecular modeling, mutagenesis-based functional inference across claudin family\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — structure-function inferred from sequence analysis and comparative data; direct mutagenesis of CLDN7 ECL not isolated in this paper\",\n      \"pmids\": [\"18036336\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Residues 32 and 48 in the first extracellular loop of CLDN7 are critical for CD81 association and HCV receptor activity. Wild-type CLDN7 does not associate with CD81 and lacks HCV receptor activity; mutation of residues 32 and 48 in CLDN7 to match CLDN1 enabled CD81 complex formation and supported virus entry, demonstrating that ECL1 residues determine CLDN–CD81 interaction specificity.\",\n      \"method\": \"FRET and stoichiometric imaging of claudin–CD81 complexes, site-directed mutagenesis of CLDN7 ECL1 residues 32 and 48, HCV pseudoparticle entry assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — mutagenesis with functional rescue, FRET-based interaction quantification, and viral entry assay in one study\",\n      \"pmids\": [\"20375010\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Intestinal conditional knockout of Cldn-7 (Cldn7fl/fl;villin-CreERT2 mice) destroys tight junction integrity, increases intercellular permeability, exacerbates colitis, and promotes colitis-associated colorectal cancer with activation of the Wnt/β-catenin signaling pathway, establishing that Cldn-7 is required for intestinal homeostasis and suppresses Wnt/β-catenin-driven proliferation.\",\n      \"method\": \"Inducible intestinal epithelial Cldn-7 conditional knockout mice, AOM/DSS colitis-cancer model, FITC-dextran permeability assay, immunofluorescence of TJ proteins, Western blot for β-catenin pathway components\",\n      \"journal\": \"Oncoimmunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo conditional KO with defined molecular pathway (Wnt/β-catenin) and permeability readout; multiple orthogonal methods\",\n      \"pmids\": [\"34026335\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Intestinal Cldn-7 knockout alters gut microbiota composition (diversity and functional profiles). Antibiotic-mediated microbiota depletion reduced the intestinal inflammation caused by Cldn-7 deficiency, and co-housing experiments transferred the inflammatory phenotype via microbiota transfer, establishing Cldn-7 as a regulator of host–microbiome interactions that prevents inflammation partly through maintaining microbiota homeostasis.\",\n      \"method\": \"Cldn-7 conditional KO mice, 16S rRNA amplicon sequencing, antibiotic depletion model, co-housing experiments, DSS colitis model, qRT-PCR of inflammatory factors and antimicrobial peptides, AB-PAS staining\",\n      \"journal\": \"Pathology, research and practice\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO with microbiota sequencing and mechanistic depletion/rescue experiments; single lab\",\n      \"pmids\": [\"39004000\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"ACSS2-mediated histone H4 lysine 12 crotonylation (H4K12cr) directly upregulates CLDN7 transcription to reinforce intestinal epithelial barrier integrity. TNF-α promotes m6A modification of ACSS2 mRNA, destabilizing ACSS2 and reducing H4K12cr, which decreases CLDN7 expression. Crotonate supplementation restored H4K12cr and CLDN7 levels and ameliorated colitis, establishing a TNF-α → m6A-ACSS2 → H4K12cr → CLDN7 regulatory axis.\",\n      \"method\": \"Genetic/pharmacologic ACSS2 inhibition in mice and intestinal epithelial cells, ChIP-seq for H4K12cr at CLDN7 locus, m6A sequencing of ACSS2 mRNA, TEER and permeability assays, crotonate supplementation rescue experiments\",\n      \"journal\": \"Advanced science (Weinheim, Baden-Wurttemberg, Germany)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — ChIP-seq demonstrating H4K12cr at CLDN7 locus, genetic KO, m6A sequencing, and functional rescue with multiple orthogonal methods\",\n      \"pmids\": [\"40650658\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"miR-1193 directly targets CLDN7 mRNA in cervical cancer cells; luciferase reporter assay confirmed binding, and restoration of CLDN7 in miR-1193-overexpressing cells rescued proliferation, invasion, and migration, establishing CLDN7 as a functional downstream effector of miR-1193-mediated tumor suppression.\",\n      \"method\": \"Luciferase reporter assay, qRT-PCR, Western blot, CCK-8 proliferation assay, transwell invasion/migration assay, rescue overexpression of CLDN7\",\n      \"journal\": \"OncoTargets and therapy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct 3'UTR luciferase validation plus rescue experiment; single lab\",\n      \"pmids\": [\"32547067\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"HNF4α and HNF4γ are primary transcriptional regulators of CLDN7 (along with other TJ genes). Combined knockout of Hnf4α/γ in mice repressed Cldn7 and other TJ genes, impaired epithelial barrier function via both pore and leak pathways, and this was phenocopied in Crohn's disease patient-derived organoids. Pharmacologic HNF4 agonists (NCT, NFT) restored TJ gene expression including Cldn7 and rescued barrier function.\",\n      \"method\": \"Hnf4α/γ double knockout mice, transcriptomic analysis, FITC-dextran flux, TEER measurement in organoids, HNF4 agonist treatment of CD patient-derived organoids and Tnf-ΔARE/+ mouse organoids\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO transcriptomics + functional barrier assays + pharmacologic rescue; preprint, not yet peer-reviewed\",\n      \"pmids\": [\"bio_10.1101_2025.10.27.684895\"],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"CLDN7 is a four-transmembrane tight junction protein whose C-terminal YV motif binds ZO-1/2/3 PDZ1 domains to anchor it to the TJ scaffold; it directly interacts with EpCAM (requiring lipid raft localization where CLDN7 phosphorylation occurs) and serves as an obligate scaffold for EpCAM/CO-029/CD44v6 complex assembly in tetraspanin-enriched microdomains, conferring apoptosis resistance; specific ECL1 residues (32 and 48) determine its inability to engage CD81 (unlike CLDN1); its transcription is positively regulated by HNF4α/γ and by ACSS2-mediated H4K12 crotonylation (suppressed by TNF-α via m6A-dependent ACSS2 destabilization), while in vivo loss of CLDN7 disrupts TJ integrity, activates Wnt/β-catenin signaling, and promotes intestinal inflammation partly by dysregulating gut microbiota.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"CLDN7 is a transmembrane tight junction protein essential for intestinal epithelial barrier integrity, paracellular permeability control, and suppression of inflammation-associated tumorigenesis. Intestinal conditional knockout of Cldn7 disrupts tight junctions, increases paracellular permeability, activates Wnt/β-catenin signaling during colitis-associated carcinogenesis, and alters gut microbiota composition in a manner that drives intestinal inflammation [PMID:34026335, PMID:39004000]. CLDN7 transcription is positively regulated by ACSS2-mediated histone H4K12 crotonylation and by the transcription factors HNF4α/γ, while its mRNA is post-transcriptionally controlled by miR-873 (sequestered by the ceRNA DDX11-AS1) and miR-1193 [PMID:40650658, PMID:31298324, PMID:32547067]. In cancer contexts, CLDN7 can function as an effector promoting proliferation, invasion, and epithelial-mesenchymal transition, indicating context-dependent roles in epithelial homeostasis versus malignancy [PMID:29788731, PMID:31298324].\",\n  \"teleology\": [\n    {\n      \"year\": 2018,\n      \"claim\": \"Initial functional studies established that CLDN7 is not merely a structural tight junction component but actively promotes cancer cell proliferation, invasion, and EMT in gastric cancer cells, raising the question of whether CLDN7 plays context-dependent pro-tumorigenic roles.\",\n      \"evidence\": \"Overexpression and siRNA knockdown in gastric cancer cell lines with proliferation, invasion, and EMT marker assays\",\n      \"pmids\": [\"29788731\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"Single-lab cell line study without in vivo validation or pathway mechanism\",\n        \"No reconciliation with barrier-protective roles in normal epithelium\",\n        \"EMT phenotype not confirmed with orthogonal markers or lineage tracing\"\n      ]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identification of a ceRNA regulatory axis (DDX11-AS1/miR-873/CLDN7) revealed a post-transcriptional mechanism controlling CLDN7 expression and explained how CLDN7 protein levels are modulated in colorectal cancer.\",\n      \"evidence\": \"Luciferase reporter assays, siRNA knockdown, rescue experiments, and functional cell assays in colorectal cancer cells\",\n      \"pmids\": [\"31298324\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"ceRNA axis validated only in cancer cell lines, not in normal intestinal epithelium\",\n        \"Quantitative stoichiometric validation of ceRNA competition not performed\",\n        \"No in vivo confirmation of the DDX11-AS1/miR-873/CLDN7 axis\"\n      ]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"miR-1193 was identified as a second microRNA directly targeting the CLDN7 3′UTR, broadening the picture of post-transcriptional CLDN7 regulation and demonstrating CLDN7 as a functional mediator of miR-1193 effects in cervical cancer.\",\n      \"evidence\": \"Luciferase reporter assay, qRT-PCR, Western blot, and rescue experiments in cervical cancer cells\",\n      \"pmids\": [\"32547067\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Relevance of miR-1193/CLDN7 axis to intestinal epithelial homeostasis unknown\",\n        \"No in vivo validation\",\n        \"Relative contribution of miR-1193 versus miR-873 to CLDN7 regulation not compared\"\n      ]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Conditional intestinal knockout provided definitive in vivo evidence that CLDN7 maintains tight junction integrity, limits paracellular permeability, and suppresses Wnt/β-catenin-driven colitis-associated carcinogenesis, establishing its non-redundant barrier and tumor-suppressive functions.\",\n      \"evidence\": \"Inducible Cldn7fl/fl;villin-CreERT2 knockout mice with AOM/DSS model, FITC-dextran permeability, Wnt pathway immunostaining, and histopathology\",\n      \"pmids\": [\"34026335\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Direct mechanism by which CLDN7 loss activates Wnt/β-catenin signaling not delineated\",\n        \"Contribution of individual tight junction partners to the phenotype not dissected\",\n        \"Whether CLDN7 signals through intracellular domains or acts purely structurally remains unclear\"\n      ]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Building on the knockout model, Cldn7 deficiency was shown to alter gut microbiota composition, and antibiotic depletion of flora rescued the inflammatory phenotype, placing CLDN7-dependent barrier integrity upstream of host-microbiome crosstalk that amplifies intestinal inflammation.\",\n      \"evidence\": \"Intestinal Cldn7 knockout mice with antibiotic and co-housing experiments, 16S rRNA sequencing, and inflammatory marker analysis\",\n      \"pmids\": [\"39004000\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Specific bacterial taxa causally responsible for inflammation not identified\",\n        \"Whether microbiota changes are a direct consequence of barrier leak or secondary immune effects is unresolved\",\n        \"Not independently replicated in a second laboratory\"\n      ]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"An epigenetic transcriptional mechanism was uncovered in which ACSS2-generated crotonyl-CoA drives H4K12 crotonylation at the CLDN7 locus to upregulate its transcription; TNF-α destabilizes ACSS2 mRNA via m6A modification, linking inflammatory signaling to CLDN7 repression.\",\n      \"evidence\": \"ACSS2 genetic/pharmacological inhibition in mice, crotonate supplementation, H4K12cr chromatin assays, m6A analysis, and barrier integrity readouts\",\n      \"pmids\": [\"40650658\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether H4K12cr at the CLDN7 promoter is sufficient or requires co-activators is unknown\",\n        \"Relative importance of this epigenetic axis versus HNF4-mediated transcription not compared\",\n        \"Single-lab finding awaiting independent confirmation\"\n      ]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"HNF4α/γ were identified as direct transcriptional activators of CLDN7 in intestinal epithelium; their combined loss represses Cldn7 and impairs barrier function, while pharmacologic HNF4 activation restores expression and barrier integrity.\",\n      \"evidence\": \"(preprint) Hnf4α/γ double-knockout mice, transcriptomics, FITC-dextran/TEER assays, patient-derived organoids, and HNF4 agonist treatment\",\n      \"pmids\": [\"bio_10.1101_2025.10.27.684895\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Preprint not yet peer-reviewed\",\n        \"Direct HNF4 binding to CLDN7 promoter confirmed only by transcriptomic inference, not by dedicated ChIP at the CLDN7 locus\",\n        \"Interplay between HNF4 and ACSS2/H4K12cr-mediated regulation at the CLDN7 locus unexplored\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The mechanism by which CLDN7 loss activates Wnt/β-catenin signaling — whether through direct intracellular interactions, altered membrane complex composition, or secondary effects of barrier breach and inflammation — remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No structural or biochemical data on CLDN7 intracellular signaling domains\",\n        \"No direct binding partners linking CLDN7 to Wnt pathway components identified\",\n        \"Context-dependent oncogenic versus tumor-suppressive functions not mechanistically reconciled\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 1, 2]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1500931\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [2, 5]}\n    ],\n    \"complexes\": [\n      \"Tight junction complex\"\n    ],\n    \"partners\": [\n      \"ACSS2\",\n      \"DDX11-AS1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"CLDN7 is a four-transmembrane tight junction protein that maintains epithelial barrier integrity and participates in cell-cell adhesion signaling. Its C-terminal YV motif directly binds the PDZ1 domains of ZO-1, ZO-2, and ZO-3, anchoring it to the cytoplasmic tight junction scaffold [PMID:10601346]. Beyond canonical TJ function, CLDN7 directly interacts with EpCAM in glycolipid-enriched membrane microdomains and serves as an obligate scaffold for assembly of the EpCAM/CO-029/CD44v6 complex in tetraspanin-enriched microdomains, conferring apoptosis resistance in colorectal cancer cells [PMID:16054130, PMID:17579117]. In vivo, intestinal loss of CLDN7 disrupts paracellular barrier integrity, activates Wnt/β-catenin signaling to promote colitis-associated tumorigenesis, and dysregulates gut microbiota composition, while its transcription is positively regulated by ACSS2-mediated H4K12 crotonylation, a pathway suppressed by TNF-α through m6A-dependent ACSS2 mRNA destabilization [PMID:34026335, PMID:39004000, PMID:40650658].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Establishing CLDN7 as a tight junction structural component resolved its basic subcellular role within the newly defined claudin family, and identification of direct PDZ1-mediated binding of ZO-1/2/3 to the claudin C-terminal YV motif revealed the molecular link between claudins and the cytoplasmic TJ plaque.\",\n      \"evidence\": \"HA-tagged CLDN7 transfection and immunolocalization in MDCK cells; in vitro PDZ domain pulldown assays and co-recruitment in L fibroblasts\",\n      \"pmids\": [\"9892664\", \"10601346\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry of ZO–CLDN7 complexes not determined\", \"Contribution of CLDN7 to paracellular ion selectivity not isolated from other claudins\", \"Post-translational regulation of the YV–PDZ interaction unknown\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Discovery that CLDN7 directly associates with EpCAM in lipid rafts, with phosphorylation restricted to this raft-localized pool, expanded CLDN7 function beyond canonical TJ sealing to adhesion-signaling scaffolding in specialized membrane domains.\",\n      \"evidence\": \"Co-immunoprecipitation with membrane-permeable cross-linker, sucrose density gradient lipid raft fractionation, immunofluorescence co-localization\",\n      \"pmids\": [\"16054130\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Kinase responsible for raft-restricted CLDN7 phosphorylation unidentified\", \"Phosphorylation site(s) on CLDN7 not mapped\", \"Whether EpCAM binding requires CLDN7 phosphorylation not tested\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Demonstrating that CLDN7 is the obligate scaffold for EpCAM/CO-029/CD44v6 complex assembly in tetraspanin-enriched microdomains, and that this complex confers apoptosis resistance, established a non-TJ oncogenic function for CLDN7.\",\n      \"evidence\": \"Reciprocal co-IP with CLDN7 siRNA knockdown in colorectal cancer cells, sucrose gradient TEM fractionation, apoptosis assays\",\n      \"pmids\": [\"17579117\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct binding interfaces between CLDN7 and CO-029/CD44v6 not mapped\", \"Whether scaffold function operates in non-cancerous epithelia unknown\", \"Downstream apoptosis resistance mechanism not fully delineated\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Identification of ECL1 residues 32 and 48 as determinants of CLDN7's inability to associate with CD81 (and consequent lack of HCV receptor activity) provided the first residue-level functional map of CLDN7's extracellular loop specificity.\",\n      \"evidence\": \"FRET-based stoichiometric imaging, site-directed mutagenesis of CLDN7 ECL1, HCV pseudoparticle entry assay\",\n      \"pmids\": [\"20375010\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full structural basis of ECL1 selectivity unresolved—no crystal or cryo-EM structure of CLDN7\", \"Whether residues 32/48 influence paracellular selectivity not tested\", \"Trans-interaction partners of CLDN7 ECL2 not identified\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Intestinal conditional knockout of Cldn7 proved it is required in vivo for TJ integrity and intestinal homeostasis, and revealed that its loss activates Wnt/β-catenin signaling to promote colitis-associated tumorigenesis, linking barrier failure to a specific oncogenic pathway.\",\n      \"evidence\": \"Inducible villin-CreERT2 Cldn7 conditional KO mice, AOM/DSS model, FITC-dextran permeability, immunofluorescence, Western blot for β-catenin\",\n      \"pmids\": [\"34026335\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct mechanism by which CLDN7 loss activates Wnt/β-catenin not established\", \"Whether CLDN7 physically interacts with Wnt pathway components not tested\", \"Relative contribution of barrier leak versus CLDN7 signaling to tumorigenesis not separated\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"The finding that CLDN7-deficient intestinal inflammation is partly mediated by dysregulated gut microbiota—transferable by co-housing and reversible by antibiotics—added a host-microbiome axis to CLDN7's barrier-protective function.\",\n      \"evidence\": \"Cldn7 conditional KO mice, 16S rRNA sequencing, antibiotic depletion, co-housing transfer of inflammatory phenotype\",\n      \"pmids\": [\"39004000\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Specific microbial species or metabolites driving inflammation not identified\", \"Whether microbiota changes are secondary to barrier leak or CLDN7-specific signaling unclear\", \"Single-lab finding awaiting independent replication\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Identification of the TNF-α → m6A-ACSS2 → H4K12 crotonylation → CLDN7 transcriptional axis provided the first chromatin-level regulatory mechanism for CLDN7 expression and a pharmacologically targetable node (crotonate) for barrier restoration in colitis.\",\n      \"evidence\": \"ChIP-seq for H4K12cr at the CLDN7 locus, ACSS2 genetic/pharmacologic inhibition, m6A sequencing of ACSS2 mRNA, TEER and permeability assays, crotonate rescue in mice and intestinal epithelial cells\",\n      \"pmids\": [\"40650658\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether other histone acylation marks cooperate with H4K12cr at the CLDN7 promoter not explored\", \"Identity of the m6A reader destabilizing ACSS2 mRNA not determined\", \"Relevance to extra-intestinal epithelia not tested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"No high-resolution structure of CLDN7 exists, the direct mechanism linking CLDN7 loss to Wnt/β-catenin activation is unknown, and the functional significance of raft-restricted CLDN7 phosphorylation remains undefined.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No cryo-EM or crystal structure of CLDN7\", \"Phosphorylation sites and responsible kinases uncharacterized\", \"Whether CLDN7 directly modulates Wnt pathway components or acts indirectly via barrier disruption is unresolved\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098631\", \"supporting_discovery_ids\": [0, 1, 3, 4, 7]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [0, 1, 7]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [3, 4]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 3, 4, 6]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1500931\", \"supporting_discovery_ids\": [0, 1, 3, 4, 7]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [7]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [4, 7]}\n    ],\n    \"complexes\": [\n      \"EpCAM/CLDN7/CO-029/CD44v6 tetraspanin-enriched microdomain complex\"\n    ],\n    \"partners\": [\n      \"TJP1\",\n      \"TJP2\",\n      \"TJP3\",\n      \"EPCAM\",\n      \"TSPAN8\",\n      \"CD44\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}