{"gene":"CLDN18","run_date":"2026-06-09T22:57:18","timeline":{"discoveries":[{"year":2015,"finding":"The CLDN18-ARHGAP26 fusion protein (resulting from chromosomal rearrangement fusing the tight junction gene CLDN18 with the RHOA inhibitor-encoding ARHGAP26) induces loss of epithelial integrity: epithelial cell lines expressing the fusion showed dramatic EMT-like morphology with long protrusions, impaired barrier properties, reduced cell-cell and cell-extracellular matrix adhesion, retarded wound healing, inhibition of RHOA activity, and gain of invasion in cancer cell lines.","method":"DNA paired-end-tag whole-genome sequencing to identify fusions; expression of fusion in epithelial cell lines; barrier function assays; adhesion assays; wound healing assays; RhoA activity measurement; invasion assays","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal functional assays (barrier, adhesion, wound healing, RHOA activity, invasion) in cell lines expressing the fusion construct, with direct mechanistic readouts","pmids":["26146084"],"is_preprint":false},{"year":2024,"finding":"The CLDN18-ARHGAP26 fusion protein is a gain-of-function oncogene in diffuse gastric cancer: contrary to the initial model that it inhibits RHOA (via ARHGAP26 GAP activity), expression of the fusion in gastric organoids promoted activation of RHOA and downstream effector signaling, activated focal adhesion kinase (FAK), and induced YAP pathway activation. The fusion induced signet ring cell formation and cooperatively transformed gastric cells when combined with Trp53 loss.","method":"Transgenic mouse model (LSL-CLDN18-ARHGAP26 knock-in); gastric organoids derived from the model; biochemical assays of RHOA activity and downstream signaling; FAK and YAP pathway analysis; FAK/YAP-TEAD inhibitor combination studies; tumor growth assays","journal":"Gut","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — in vivo transgenic model with organoids, multiple orthogonal biochemical readouts, epistasis via inhibitor combinations, mechanistic pathway placement","pmids":["38621923"],"is_preprint":false},{"year":2018,"finding":"CLDN18.1, the lung-specific isoform of CLDN18, inhibits IGF-1R and AKT phosphorylation and decreases expression of transcriptional co-activators TAZ and YAP (and their target genes) in lung adenocarcinoma cells, contributing to tumor suppressor activity. Silencing of TAZ (and possibly YAP) with siRNA also implicated TAZ in CLDN18.1-mediated AKT inactivation.","method":"Restoration of CLDN18.1 expression in LuAd cell lines; Western blot analysis of IGF-1R and AKT phosphorylation; siRNA knockdown of YAP and TAZ; xenograft tumor growth assays; Cldn18-/- mouse lung alveolar epithelial type II cell high-throughput analysis; cell proliferation, migration, invasion, and colony formation assays","journal":"International journal of cancer","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (KO mice, KD/KO in human cells, rescue experiments, Western blot, siRNA epistasis, in vivo xenografts), single lab but extensive mechanistic validation","pmids":["30325015"],"is_preprint":false},{"year":2024,"finding":"CLDN18-ARHGAP fusion-positive gastric cancer cells activate PI3K/AKT-mTOR-FAS signaling, which enhances free fatty acid production to favor the survival of regulatory T (Treg) cells, contributing to an immunosuppressive tumor microenvironment. PI3K inhibition reversed Treg upregulation and enhanced anti-tumor cytotoxicity of neoantigen-reactive T cells.","method":"In vitro coculture models; xenograft gastric cancer models; PI3K inhibitor treatment; measurement of free fatty acid production; Treg cell survival and frequency assays","journal":"EMBO molecular medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro and in vivo models with PI3K inhibitor epistasis and fatty acid production measurements; single lab with two orthogonal approaches","pmids":["39164472"],"is_preprint":false},{"year":2020,"finding":"CLDN18.1 expression is inversely regulated by promoter methylation in lung adenocarcinoma, and its restoration suppresses malignant properties (proliferation, migration, invasion, anchorage-independent growth) and inhibits IGF-1R and AKT phosphorylation, as well as reducing TAZ and YAP expression.","method":"Promoter methylation analysis; restoration of CLDN18.1 in LuAd cells; Western blot; in vitro functional assays (proliferation, migration, invasion); xenograft models (referenced in context of CLDN18.1 study)","journal":"Aging","confidence":"Low","confidence_rationale":"Tier 3 / Weak — primarily bioinformatics with limited cell experiment validation described in abstract; confirmatory of prior work","pmids":["32668412"],"is_preprint":false},{"year":2023,"finding":"miR-448 directly targets the 3'-UTR of CLDN18 and represses its expression in gastric cancer cells; CLDN18.2 overexpression suppresses YAP/TAZ transcriptional co-activator activity and promotes cytoplasmic retention of phosphorylated YAP (at Ser-127), thereby inhibiting GC cell proliferation and metastasis.","method":"Luciferase reporter assay with CLDN18 3'-UTR; RNA-seq; qRT-PCR; Co-IP; cytoplasmic-nuclear fractionation; Western blot; in vitro proliferation and metastasis assays; in vivo xenograft","journal":"Journal of ethnopharmacology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — luciferase reporter validates miR-448/CLDN18 interaction; subcellular fractionation and Co-IP support YAP/TAZ mechanism; single lab with multiple methods","pmids":["37023839"],"is_preprint":false},{"year":2003,"finding":"Zolbetuximab (anti-CLDN18.2 monoclonal antibody) mediates killing of CLDN18.2-positive tumor cells through immune effector mechanisms including antibody-dependent cellular cytotoxicity (ADCC) via NK cells and complement-dependent cytotoxicity (CDC). This mechanism requires high antigen density on the cell surface and is enhanced by chemotherapy-induced CLDN18.2 upregulation.","method":"Preclinical pharmacodynamic studies; ADCC and CDC assays; NK cell depletion experiments; phase I pharmacodynamic assessment confirming NK/complement engagement in patients","journal":"Expert review of anticancer therapy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mechanistic evidence from preclinical assays and clinical pharmacodynamic confirmation in a review synthesizing multiple studies; not a single primary paper","pmids":["41521591"],"is_preprint":false},{"year":2022,"finding":"ZL-1211, an anti-CLDN18.2 antibody engineered for enhanced ADCC, induces NK cell-dependent tumor cell killing; NK cell depletion abrogated ZL-1211-mediated ADCC in vitro, and in vivo efficacy was also dependent on the presence of an NK compartment. ZL-1211 triggered NK cell activation with robust inflammatory cytokine production (IFNγ, TNFα, IL6) and NK cell recruitment into the tumor microenvironment.","method":"NK cell depletion in vitro ADCC assays; mouse xenograft models with NK depletion; cytokine measurement; patient-derived gastric tumor coculture; in vivo tumor models","journal":"Cancer research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — NK depletion epistasis in both in vitro and in vivo settings; single lab, multiple orthogonal approaches","pmids":["36922936"],"is_preprint":false},{"year":2024,"finding":"CLDN18.2-directed ADC (αCLDN18.2-MMAE) induces dose-dependent apoptosis via caspase-9/PARP cleavage in CLDN18.2-positive gastric cancer cells; treatment also activates cytoprotective autophagy (evidenced by autophagosome accumulation, LC3-I to LC3-II conversion, complete autophagic flux) via Akt/mTOR pathway inactivation. Inhibiting autophagy enhances ADC-induced cytotoxicity and apoptosis.","method":"In vitro cytotoxicity assays; Western blot for caspase-9/PARP cleavage; LC3 conversion assay; autophagic flux measurement; Akt/mTOR phosphorylation analysis; autophagy inhibitor (LY294002) combination; in vivo xenograft tumor models","journal":"Cell death discovery","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal mechanistic assays (apoptosis markers, autophagic flux, pathway analysis, inhibitor epistasis, in vivo confirmation); single lab","pmids":["39227365"],"is_preprint":false},{"year":2024,"finding":"CLDN18.2 undergoes O-GlcNAcylation at threonine-204 (T204), driven cooperatively by KRAS mutation and hyperglycemia. This O-GlcNAcylation promotes cytoplasmic accumulation of CLDN18.2 (rather than membrane localization), enhances pancreatic cancer migration, invasion, and metastasis, and reduces sensitivity to anti-CLDN18.2 targeted therapy. Mechanistically, O-GlcNAcylated CLDN18.2 shows reduced binding to PTP1B, leading to enhanced tyrosine phosphorylation; it also recruits Src via its SH2 domain to trigger Src activation. Genetic (T204A mutation) or pharmacological blockade of O-GlcNAcylation restores membrane localization and suppresses tumor progression.","method":"Patient-derived xenograft and organoid models; KPC mice; KPC-Cldn18.2 KO mice; site-specific mutagenesis (T204A); immunoprecipitation; subcellular fractionation; kinase activity assays (Src, PTP1B); KRASG12D inhibitor (MRTX1133) combination studies; migration/invasion assays","journal":"Gut","confidence":"High","confidence_rationale":"Tier 1 / Strong — site-specific mutagenesis identifying the modified residue, multiple in vivo models (KPC, PDX, organoids), mechanistic binding partners identified (PTP1B, Src), subcellular localization consequence established, pharmacological rescue","pmids":["41513443"],"is_preprint":false},{"year":2026,"finding":"CD8+ T cells acquire CLDN18.2 from tumor cells via trogocytosis; 'dressed' CLDN18.2 on CD8+ T cells suppresses glucose uptake and glycolysis in those T cells, impairing their cytotoxicity. Mechanistically, trogocytosis-related CLDN18.2 induces GSK3β/CK1α-mediated β-catenin phosphorylation, promoting β-catenin ubiquitination and proteasomal degradation. CLDN18.2 interacts with β-catenin's N-terminal domain via its own C-terminal domain, strengthening the β-catenin/CK1α interaction. CLDN18.2+CD8+ T cells home to bone marrow via CXCL12/CXCR4, skew HSC myeloid differentiation, and induce systemic immune senescence via IL1α.","method":"Humanized hCD34+, KPC, Cldn18.2 KO, and PDX/organoid mouse models; flow cytometry; immunofluorescence; single-cell RNA-sequencing; immunoprecipitation-mass spectrometry (IP-MS); peptide (PC18.1) disrupting CLDN18.2/β-catenin interaction; glycolysis assays; ubiquitination assays","journal":"Gut","confidence":"High","confidence_rationale":"Tier 1 / Strong — IP-MS identifies binding partners, site-specific domain mapping of CLDN18.2/β-catenin interaction, KO models, scRNA-seq, multiple in vivo models, peptide rescue establishes causality","pmids":["41667243"],"is_preprint":false},{"year":2024,"finding":"CLDN18.2 antibody-drug conjugate (CLDN18.2-307-ADC) binds the extracellular domain of CLDN18.2, is internalized upon binding, and subsequently localizes to the lysosomal compartment, where the MMAE payload is released to induce complete and sustained tumor regression. The parental mAb (CLDN18.2-307) induces ADCC against CLDN18.2-positive cells.","method":"Antibody-CLDN18.2 binding assays; internalization and lysosomal co-localization assays; ADCC assays; CDX and PDX xenograft models","journal":"Molecular cancer therapeutics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — internalization and lysosomal localization directly demonstrated with functional consequence (tumor regression); single lab with multiple orthogonal methods","pmids":["37788341"],"is_preprint":false},{"year":2025,"finding":"CLDN18.2 is normally concealed within tight junctions in healthy gastric mucosa; upon malignant transformation and loss of cell polarity, CLDN18.2 epitopes become exposed on the tumor cell surface, making it accessible to antibody targeting. This exposure is the mechanistic basis for selective antibody-dependent cytotoxicity by zolbetuximab.","method":"Referenced from preclinical pharmacodynamic studies and review of translational evidence; not a single primary experimental paper but synthesis of mechanistic evidence","journal":"Expert review of anticancer therapy","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — mechanistic principle supported by multiple preclinical and clinical studies referenced across the corpus; established concept replicated across labs","pmids":["41521591","33610734"],"is_preprint":false},{"year":2024,"finding":"The Fc fragment of CLDN18.2/CD3 BiTE antibodies interacts with CD64+ cancer-associated fibroblasts (CAFs) via activation of the SYK-VAV2-RhoA-ROCK-MLC2-MRTF-A-α-SMA/collagen-I signaling pathway, enhancing desmoplasia and limiting late-stage T cell infiltration. Vilanterol suppressed BiTE-induced phosphorylation of VAV2 (Y172) in CD64+ CAFs, weakening desmoplasia.","method":"Fibroblast-specific Fcgr1 KO mice; flow cytometry; Masson staining; molecular docking; chromatin immunoprecipitation; VAV2 phosphorylation assay; in vivo PDAC models with vilanterol treatment","journal":"Gut","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO of CD64 in fibroblasts, molecular docking, chromatin IP, and pharmacological rescue with vilanterol; single lab but multiple orthogonal approaches","pmids":["39187291"],"is_preprint":false},{"year":2025,"finding":"Loss of Cldn18 in mouse lungs leads to the emergence of a distinct population of transitional alveolar progenitors (regeneration-associated transitional progenitors, RATPs), which are epigenetically distinct from damage-associated transitional progenitors (DATPs) and are less fibrogenic. Cldn18 KO mice are protected from bleomycin-induced fibrosis, with accelerated AT2-to-AT1 differentiation as the proposed mechanism. NKX2.1 and AP-1 are active in early transitions and TEAD factors in later stages during AT2-to-AT1 differentiation.","method":"Cldn18 KO mouse model; bleomycin fibrosis model; lineage tracing; single-nucleus multiome (RNA + ATAC); transcriptomic and epigenomic characterization of transitional progenitor populations","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO mouse model with lineage tracing and multiome profiling; preprint, not yet peer-reviewed","pmids":[],"is_preprint":true},{"year":2024,"finding":"LINC01547-ORF (a small protein encoded by lncRNA LINC01547) interacts physically with CLDN18 protein in colorectal cancer cells (demonstrated by Co-IP and immunofluorescence), reducing CLDN18 ubiquitination and promoting its protein expression. LINC01547-ORF targets CLDN18 to inhibit the FAK/PI3K/AKT signaling pathway, suppressing CRC cell proliferation and migration.","method":"Co-immunoprecipitation; immunofluorescence co-localization; ubiquitination assay; Western blot for FAK/PI3K/AKT; protein molecular docking; cell proliferation and migration assays","journal":"American journal of cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP validates CLDN18 protein interaction with LINC01547-ORF, ubiquitination reduction measured directly, FAK/AKT pathway placement confirmed by Western blot; single lab","pmids":["39659940"],"is_preprint":false},{"year":2020,"finding":"IL-1β downregulates claudin-18 expression to promote lung barrier function damage by signaling through the IL-1β-HER2/HER3 axis, contributing to ARDS pathogenesis. This was validated in cell experiments and animal models.","method":"Bioinformatics analysis; cell experiments with IL-1β stimulation and measurement of claudin-18 expression; lung barrier function assays; animal ARDS models","journal":"Aging","confidence":"Low","confidence_rationale":"Tier 3 / Weak — abstract describes cell and animal experiments but limited mechanistic detail; single lab, partial pathway characterization","pmids":["32065780"],"is_preprint":false},{"year":2025,"finding":"SUSD2 exerts tumor-suppressive effects in lung adenocarcinoma through regulation of the cell adhesion molecules pathway via modulation of CLDN18.2, thereby influencing cell adhesion dynamics. Chronic nanoplastic exposure downregulated SUSD2, leading to dysregulation of the SUSD2-CLDN18.2 signaling axis and enhanced malignant phenotypes.","method":"Chronic PS-NP exposure model (A549 cells, 6 months); SUSD2 overexpression rescue experiments; multi-omics analysis; cell adhesion and migration assays","journal":"Ecotoxicology and environmental safety","confidence":"Low","confidence_rationale":"Tier 3 / Weak — mechanistic link between SUSD2 and CLDN18.2 inferred from multi-omics; SUSD2 overexpression rescue shown but direct CLDN18.2 functional experiments limited in abstract","pmids":["40882394"],"is_preprint":false}],"current_model":"CLDN18 encodes two isoforms (CLDN18.1, lung-specific; CLDN18.2, gastric-specific) that are structural tight junction components; CLDN18.2 is normally sequestered within junctions in gastric mucosa but becomes surface-exposed upon malignant transformation and loss of polarity, enabling immune effector mechanisms (ADCC via NK cells, CDC) when targeted by antibodies like zolbetuximab; CLDN18-ARHGAP26 gene fusions disrupt epithelial integrity by activating RHOA, FAK, and YAP signaling to drive diffuse gastric cancer; CLDN18.1 acts as a tumor suppressor in lung adenocarcinoma by inhibiting IGF-1R/AKT and suppressing YAP/TAZ; CLDN18.2 can undergo O-GlcNAcylation at T204 (driven by KRAS mutation/hyperglycemia), causing cytoplasmic mislocalization and Src activation that promotes cancer progression and therapy resistance; and CLDN18.2 can be acquired by CD8+ T cells via trogocytosis, where it suppresses T cell glycolysis and cytotoxicity through GSK3β/CK1α-mediated β-catenin degradation."},"narrative":{"mechanistic_narrative":"CLDN18 encodes a tight junction structural protein expressed as two tissue-restricted isoforms whose function and oncogenic relevance diverge sharply between lung and gastric/pancreatic tissue [PMID:26146084, PMID:30325015]. In lung adenocarcinoma, the lung-specific isoform CLDN18.1 acts as a tumor suppressor, inhibiting IGF-1R and AKT phosphorylation and reducing the YAP/TAZ transcriptional co-activators and their target genes [PMID:30325015]. In the stomach, a chromosomal rearrangement fusing CLDN18 to ARHGAP26 produces a gain-of-function oncoprotein that disrupts epithelial integrity, causes EMT-like morphology, impaired barrier and adhesion, and increased invasion [PMID:26146084], and in vivo drives diffuse gastric cancer by activating RHOA, FAK and YAP signaling and inducing signet ring cell formation, cooperating with Trp53 loss [PMID:38621923]. The gastric isoform CLDN18.2 is a major immunotherapy target: normally concealed within tight junctions, it becomes surface-exposed upon malignant transformation and loss of polarity [PMID:41521591, PMID:33610734], enabling antibodies such as zolbetuximab to kill tumor cells via NK-cell ADCC and complement-dependent cytotoxicity [PMID:41521591, PMID:36922936], and supporting antibody-drug conjugates that internalize to lysosomes to release cytotoxic payloads [PMID:37788341, PMID:39227365]. CLDN18.2 trafficking and signaling are further controlled post-translationally: O-GlcNAcylation at T204, driven by KRAS mutation and hyperglycemia, drives cytoplasmic mislocalization, reduces PTP1B binding, and recruits Src to promote pancreatic cancer progression and therapy resistance [PMID:41513443]. CLDN18.2 can also be transferred to CD8+ T cells via trogocytosis, where it binds β-catenin through its C-terminal domain to promote GSK3β/CK1α-mediated β-catenin degradation, suppressing T-cell glycolysis and cytotoxicity [PMID:41667243].","teleology":[{"year":2003,"claim":"Established the therapeutic principle that surface CLDN18.2 can be exploited for immune-mediated tumor killing, defining the mechanism of anti-CLDN18.2 antibodies.","evidence":"ADCC and CDC assays with NK cell depletion plus clinical pharmacodynamic confirmation for zolbetuximab","pmids":["41521591"],"confidence":"Medium","gaps":["Review synthesis rather than single primary dataset","Does not define the molecular determinants of antigen surface exposure"]},{"year":2015,"claim":"Resolved how the CLDN18-ARHGAP26 fusion alters cell behavior, showing it abolishes epithelial barrier/adhesion and confers invasion.","evidence":"Whole-genome paired-end sequencing for fusion discovery; barrier, adhesion, wound-healing, RHOA, and invasion assays in epithelial cell lines","pmids":["26146084"],"confidence":"High","gaps":["Initial model attributed phenotype to RHOA inhibition, later contradicted","Cell-line overexpression rather than physiologic context"]},{"year":2018,"claim":"Defined CLDN18.1 as a lung tumor suppressor acting through IGF-1R/AKT and YAP/TAZ, distinguishing isoform-specific function.","evidence":"Cldn18-/- mice, rescue in LuAd cell lines, Western blot, siRNA epistasis, xenografts","pmids":["30325015"],"confidence":"High","gaps":["Direct biochemical link between CLDN18.1 and IGF-1R not established","Mechanism of YAP/TAZ suppression unclear"]},{"year":2023,"claim":"Identified upstream control of CLDN18 by miR-448 and linked CLDN18.2 to YAP phosphorylation/cytoplasmic retention in gastric cancer.","evidence":"Luciferase 3'-UTR reporter, Co-IP, cytoplasmic-nuclear fractionation, in vitro and xenograft assays","pmids":["37023839"],"confidence":"Medium","gaps":["Mechanism of YAP Ser127 phosphorylation by CLDN18.2 not defined","Single lab"]},{"year":2024,"claim":"Overturned the original RHOA-inhibition model, showing the fusion is a gain-of-function oncogene activating RHOA, FAK, and YAP in vivo.","evidence":"Transgenic LSL-CLDN18-ARHGAP26 knock-in mice and gastric organoids; RHOA/FAK/YAP biochemistry; FAK/YAP-TEAD inhibitor epistasis","pmids":["38621923"],"confidence":"High","gaps":["Molecular basis for RHOA activation by a GAP-domain-containing fusion unresolved","Relationship to ARHGAP26 catalytic activity unclear"]},{"year":2024,"claim":"Connected the fusion to an immunosuppressive microenvironment via PI3K/AKT-mTOR-FAS lipid metabolism favoring Tregs.","evidence":"Coculture and xenograft models with PI3K inhibitor and free-fatty-acid measurement","pmids":["39164472"],"confidence":"Medium","gaps":["Direct CLDN18-fusion-to-PI3K mechanistic link not detailed","Single lab"]},{"year":2024,"claim":"Characterized ADC mechanism of action, showing payload-induced apoptosis is opposed by cytoprotective autophagy via Akt/mTOR inactivation.","evidence":"Caspase-9/PARP cleavage, LC3 flux, Akt/mTOR analysis, autophagy inhibitor combination, xenografts","pmids":["39227365"],"confidence":"Medium","gaps":["Generality across ADC formats unknown","Single lab"]},{"year":2024,"claim":"Identified O-GlcNAcylation at T204 as a metabolic switch controlling CLDN18.2 localization, PTP1B/Src signaling, and therapy resistance.","evidence":"Site-specific T204A mutagenesis, KPC/PDX/organoid models, IP, fractionation, Src/PTP1B kinase assays, KRAS inhibitor combination","pmids":["41513443"],"confidence":"High","gaps":["Enzyme catalyzing T204 O-GlcNAcylation not identified","Whether modification occurs in gastric versus pancreatic disease unaddressed"]},{"year":2024,"claim":"Defined Fc-mediated CLDN18.2/CD3 BiTE engagement of CD64+ CAFs as a driver of desmoplasia limiting T-cell infiltration.","evidence":"Fibroblast Fcgr1 KO mice, molecular docking, ChIP, VAV2 phosphorylation assay, vilanterol rescue in PDAC models","pmids":["39187291"],"confidence":"Medium","gaps":["Concerns the antibody Fc, not CLDN18 protein function directly","Single lab"]},{"year":2024,"claim":"Identified LINC01547-ORF as a CLDN18-binding micropeptide that stabilizes CLDN18 and suppresses FAK/PI3K/AKT in colorectal cancer.","evidence":"Co-IP, immunofluorescence colocalization, ubiquitination assay, Western blot, docking","pmids":["39659940"],"confidence":"Medium","gaps":["Single Co-IP-based interaction without reciprocal in vivo validation","Isoform specificity not resolved"]},{"year":2025,"claim":"Demonstrated that surface exposure of CLDN18.2 upon loss of polarity is the mechanistic basis for selective antibody targeting.","evidence":"Synthesis of preclinical pharmacodynamic and translational evidence","pmids":["41521591","33610734"],"confidence":"Medium","gaps":["Review-level synthesis, not a single primary dataset","Quantitative epitope accessibility not measured"]},{"year":2025,"claim":"Revealed a role for Cldn18 loss in promoting less-fibrogenic alveolar transitional progenitors and protection from lung fibrosis.","evidence":"Cldn18 KO mice, bleomycin model, lineage tracing, single-nucleus multiome (preprint)","pmids":[],"confidence":"Medium","gaps":["Preprint, not peer-reviewed","Direct molecular role of CLDN18 in AT2-to-AT1 differentiation undefined"]},{"year":2026,"claim":"Uncovered trogocytic transfer of CLDN18.2 to CD8+ T cells as an immune-evasion mechanism via β-catenin degradation and metabolic suppression.","evidence":"Humanized/KPC/KO/PDX models, IP-MS, domain mapping, glycolysis and ubiquitination assays, peptide (PC18.1) rescue","pmids":["41667243"],"confidence":"High","gaps":["Frequency and clinical relevance of trogocytosis in patients unquantified","Whether antibody therapy alters trogocytic transfer unknown"]},{"year":null,"claim":"How the two isoforms' shared tight-junction structural role mechanistically connects their opposing tumor-suppressive (lung) versus oncogenic-target (gastric/pancreatic) behaviors remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unifying structural model linking junction function to signaling outputs","Isoform-specific interactomes incompletely mapped"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[0,12]},{"term_id":"GO:0098631","term_label":"cell adhesion mediator activity","supporting_discovery_ids":[0,17]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[2,10]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[9,11,12]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[9]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[1,2,9]},{"term_id":"R-HSA-1500931","term_label":"Cell-Cell communication","supporting_discovery_ids":[0]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[6,7,10]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[0,1,9]}],"complexes":["tight junction"],"partners":["ARHGAP26","PTP1B","SRC","CTNNB1","CK1Α","LINC01547-ORF"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P56856","full_name":"Claudin-18","aliases":[],"length_aa":261,"mass_kda":27.9,"function":"Involved in alveolar fluid homeostasis via regulation of alveolar epithelial tight junction composition and therefore ion transport and solute permeability, potentially via downstream regulation of the actin cytoskeleton organization and beta-2-adrenergic signaling (By similarity). Required for lung alveolarization and maintenance of the paracellular alveolar epithelial barrier (By similarity). Acts to maintain epithelial progenitor cell proliferation and organ size, via regulation of YAP1 localization away from the nucleus and thereby restriction of YAP1 target gene transcription (By similarity). Acts as a negative regulator of RANKL-induced osteoclast differentiation, potentially via relocation of TJP2/ZO-2 away from the nucleus, subsequently involved in bone resorption in response to calcium deficiency (By similarity). Mediates the osteoprotective effects of estrogen, potentially via acting downstream of estrogen signaling independently of RANKL signaling pathways (By similarity) Involved in the maintenance of homeostasis of the alveolar microenvironment via regulation of pH and subsequent T-cell activation in the alveolar space, is therefore indirectly involved in limiting C.neoformans infection Required for the formation of the gastric paracellular barrier via its role in tight junction formation, thereby involved in the response to gastric acidification","subcellular_location":"Cell junction, tight junction; Lateral cell membrane","url":"https://www.uniprot.org/uniprotkb/P56856/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CLDN18","classification":"Not Classified","n_dependent_lines":2,"n_total_lines":1208,"dependency_fraction":0.0016556291390728477},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/CLDN18","total_profiled":1310},"omim":[{"mim_id":"609210","title":"CLAUDIN 18; CLDN18","url":"https://www.omim.org/entry/609210"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Cell Junctions","reliability":"Approved"}],"tissue_specificity":"Group enriched","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"lung","ntpm":237.8},{"tissue":"stomach 1","ntpm":684.2}],"url":"https://www.proteinatlas.org/search/CLDN18"},"hgnc":{"alias_symbol":[],"prev_symbol":["SFTPJ"]},"alphafold":{"accession":"P56856","domains":[{"cath_id":"1.20.140.150","chopping":"1-29_72-154_166-199","consensus_level":"medium","plddt":87.0855,"start":1,"end":199}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P56856","model_url":"https://alphafold.ebi.ac.uk/files/AF-P56856-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P56856-F1-predicted_aligned_error_v6.png","plddt_mean":72.81},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CLDN18","jax_strain_url":"https://www.jax.org/strain/search?query=CLDN18"},"sequence":{"accession":"P56856","fasta_url":"https://rest.uniprot.org/uniprotkb/P56856.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P56856/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P56856"}},"corpus_meta":[{"pmid":"37068504","id":"PMC_37068504","title":"Zolbetuximab plus mFOLFOX6 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Oncology","url":"https://pubmed.ncbi.nlm.nih.gov/41537163","citation_count":0,"is_preprint":false},{"pmid":"41968569","id":"PMC_41968569","title":"Immunohistochemical Analysis of Potential Therapeutic Targets PRAME, FOLR1, and CLDN18.2 in Salivary Gland Carcinomas.","date":"2026","source":"Cancer medicine","url":"https://pubmed.ncbi.nlm.nih.gov/41968569","citation_count":0,"is_preprint":false},{"pmid":"42168932","id":"PMC_42168932","title":"SOT102, a novel CLDN18.2-targeting antibody-drug conjugate, exhibits strong therapeutic potential in solid tumors.","date":"2026","source":"BMC cancer","url":"https://pubmed.ncbi.nlm.nih.gov/42168932","citation_count":0,"is_preprint":false},{"pmid":"40900784","id":"PMC_40900784","title":"Complete remission of recurrent gastric cancer in a young female patient through CLDN18.2-targeted therapy (LM302) and metastatic ovarian tumor resection: a case report of refractory disease overcoming chemotherapy and immunotherapy resistance.","date":"2025","source":"Frontiers in oncology","url":"https://pubmed.ncbi.nlm.nih.gov/40900784","citation_count":0,"is_preprint":false},{"pmid":"41666080","id":"PMC_41666080","title":"Inhibition of miR-1303 suppresses the development of esophageal cancer by targeting CLDN18.","date":"2026","source":"The International journal of biological markers","url":"https://pubmed.ncbi.nlm.nih.gov/41666080","citation_count":0,"is_preprint":false},{"pmid":"41746497","id":"PMC_41746497","title":"Preclinical Evaluation of AHT-102, a CLDN18.2 × CD3 Bispecific Antibody: Pharmacokinetics, Anti-Tumor Efficacy, Tissue Distribution, and Safety Profile.","date":"2026","source":"Drugs in R&D","url":"https://pubmed.ncbi.nlm.nih.gov/41746497","citation_count":0,"is_preprint":false},{"pmid":"42185594","id":"PMC_42185594","title":"CLDN18 identifies high-risk precursor lesions in gallbladder carcinogenesis: A study of the TFF2⁺ pseudopyloric metaplasia to intestinal metaplasia axis.","date":"2026","source":"Virchows Archiv : an international journal of pathology","url":"https://pubmed.ncbi.nlm.nih.gov/42185594","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2025.10.01.679859","title":"Loss of tight junction protein claudin 18 uncovers alveolar epithelial stem cell plasticity and emergence of non-fibrogenic transitional progenitors","date":"2025-10-03","source":"bioRxiv","url":"https://doi.org/10.1101/2025.10.01.679859","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.04.11.648482","title":"Concordance of claudin-18.2 expression in biopsy, resection, and recurrent specimens: implications for zolbetuximab therapy in pancreatic ductal adenocarcinoma","date":"2025-04-18","source":"bioRxiv","url":"https://doi.org/10.1101/2025.04.11.648482","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":58143,"output_tokens":5685,"usd":0.129852,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":14379,"output_tokens":4166,"usd":0.088023,"stage2_stop_reason":"end_turn"},"total_usd":0.217875,"stage1_batch_id":"msgbatch_01ACAxJQabDsht39JXeWG22d","stage2_batch_id":"msgbatch_01QEU22A9U5sbPTgsMzTmvSf","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2015,\n      \"finding\": \"The CLDN18-ARHGAP26 fusion protein (resulting from chromosomal rearrangement fusing the tight junction gene CLDN18 with the RHOA inhibitor-encoding ARHGAP26) induces loss of epithelial integrity: epithelial cell lines expressing the fusion showed dramatic EMT-like morphology with long protrusions, impaired barrier properties, reduced cell-cell and cell-extracellular matrix adhesion, retarded wound healing, inhibition of RHOA activity, and gain of invasion in cancer cell lines.\",\n      \"method\": \"DNA paired-end-tag whole-genome sequencing to identify fusions; expression of fusion in epithelial cell lines; barrier function assays; adhesion assays; wound healing assays; RhoA activity measurement; invasion assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal functional assays (barrier, adhesion, wound healing, RHOA activity, invasion) in cell lines expressing the fusion construct, with direct mechanistic readouts\",\n      \"pmids\": [\"26146084\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"The CLDN18-ARHGAP26 fusion protein is a gain-of-function oncogene in diffuse gastric cancer: contrary to the initial model that it inhibits RHOA (via ARHGAP26 GAP activity), expression of the fusion in gastric organoids promoted activation of RHOA and downstream effector signaling, activated focal adhesion kinase (FAK), and induced YAP pathway activation. The fusion induced signet ring cell formation and cooperatively transformed gastric cells when combined with Trp53 loss.\",\n      \"method\": \"Transgenic mouse model (LSL-CLDN18-ARHGAP26 knock-in); gastric organoids derived from the model; biochemical assays of RHOA activity and downstream signaling; FAK and YAP pathway analysis; FAK/YAP-TEAD inhibitor combination studies; tumor growth assays\",\n      \"journal\": \"Gut\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — in vivo transgenic model with organoids, multiple orthogonal biochemical readouts, epistasis via inhibitor combinations, mechanistic pathway placement\",\n      \"pmids\": [\"38621923\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"CLDN18.1, the lung-specific isoform of CLDN18, inhibits IGF-1R and AKT phosphorylation and decreases expression of transcriptional co-activators TAZ and YAP (and their target genes) in lung adenocarcinoma cells, contributing to tumor suppressor activity. Silencing of TAZ (and possibly YAP) with siRNA also implicated TAZ in CLDN18.1-mediated AKT inactivation.\",\n      \"method\": \"Restoration of CLDN18.1 expression in LuAd cell lines; Western blot analysis of IGF-1R and AKT phosphorylation; siRNA knockdown of YAP and TAZ; xenograft tumor growth assays; Cldn18-/- mouse lung alveolar epithelial type II cell high-throughput analysis; cell proliferation, migration, invasion, and colony formation assays\",\n      \"journal\": \"International journal of cancer\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (KO mice, KD/KO in human cells, rescue experiments, Western blot, siRNA epistasis, in vivo xenografts), single lab but extensive mechanistic validation\",\n      \"pmids\": [\"30325015\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"CLDN18-ARHGAP fusion-positive gastric cancer cells activate PI3K/AKT-mTOR-FAS signaling, which enhances free fatty acid production to favor the survival of regulatory T (Treg) cells, contributing to an immunosuppressive tumor microenvironment. PI3K inhibition reversed Treg upregulation and enhanced anti-tumor cytotoxicity of neoantigen-reactive T cells.\",\n      \"method\": \"In vitro coculture models; xenograft gastric cancer models; PI3K inhibitor treatment; measurement of free fatty acid production; Treg cell survival and frequency assays\",\n      \"journal\": \"EMBO molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro and in vivo models with PI3K inhibitor epistasis and fatty acid production measurements; single lab with two orthogonal approaches\",\n      \"pmids\": [\"39164472\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"CLDN18.1 expression is inversely regulated by promoter methylation in lung adenocarcinoma, and its restoration suppresses malignant properties (proliferation, migration, invasion, anchorage-independent growth) and inhibits IGF-1R and AKT phosphorylation, as well as reducing TAZ and YAP expression.\",\n      \"method\": \"Promoter methylation analysis; restoration of CLDN18.1 in LuAd cells; Western blot; in vitro functional assays (proliferation, migration, invasion); xenograft models (referenced in context of CLDN18.1 study)\",\n      \"journal\": \"Aging\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — primarily bioinformatics with limited cell experiment validation described in abstract; confirmatory of prior work\",\n      \"pmids\": [\"32668412\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"miR-448 directly targets the 3'-UTR of CLDN18 and represses its expression in gastric cancer cells; CLDN18.2 overexpression suppresses YAP/TAZ transcriptional co-activator activity and promotes cytoplasmic retention of phosphorylated YAP (at Ser-127), thereby inhibiting GC cell proliferation and metastasis.\",\n      \"method\": \"Luciferase reporter assay with CLDN18 3'-UTR; RNA-seq; qRT-PCR; Co-IP; cytoplasmic-nuclear fractionation; Western blot; in vitro proliferation and metastasis assays; in vivo xenograft\",\n      \"journal\": \"Journal of ethnopharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — luciferase reporter validates miR-448/CLDN18 interaction; subcellular fractionation and Co-IP support YAP/TAZ mechanism; single lab with multiple methods\",\n      \"pmids\": [\"37023839\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Zolbetuximab (anti-CLDN18.2 monoclonal antibody) mediates killing of CLDN18.2-positive tumor cells through immune effector mechanisms including antibody-dependent cellular cytotoxicity (ADCC) via NK cells and complement-dependent cytotoxicity (CDC). This mechanism requires high antigen density on the cell surface and is enhanced by chemotherapy-induced CLDN18.2 upregulation.\",\n      \"method\": \"Preclinical pharmacodynamic studies; ADCC and CDC assays; NK cell depletion experiments; phase I pharmacodynamic assessment confirming NK/complement engagement in patients\",\n      \"journal\": \"Expert review of anticancer therapy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mechanistic evidence from preclinical assays and clinical pharmacodynamic confirmation in a review synthesizing multiple studies; not a single primary paper\",\n      \"pmids\": [\"41521591\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"ZL-1211, an anti-CLDN18.2 antibody engineered for enhanced ADCC, induces NK cell-dependent tumor cell killing; NK cell depletion abrogated ZL-1211-mediated ADCC in vitro, and in vivo efficacy was also dependent on the presence of an NK compartment. ZL-1211 triggered NK cell activation with robust inflammatory cytokine production (IFNγ, TNFα, IL6) and NK cell recruitment into the tumor microenvironment.\",\n      \"method\": \"NK cell depletion in vitro ADCC assays; mouse xenograft models with NK depletion; cytokine measurement; patient-derived gastric tumor coculture; in vivo tumor models\",\n      \"journal\": \"Cancer research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — NK depletion epistasis in both in vitro and in vivo settings; single lab, multiple orthogonal approaches\",\n      \"pmids\": [\"36922936\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"CLDN18.2-directed ADC (αCLDN18.2-MMAE) induces dose-dependent apoptosis via caspase-9/PARP cleavage in CLDN18.2-positive gastric cancer cells; treatment also activates cytoprotective autophagy (evidenced by autophagosome accumulation, LC3-I to LC3-II conversion, complete autophagic flux) via Akt/mTOR pathway inactivation. Inhibiting autophagy enhances ADC-induced cytotoxicity and apoptosis.\",\n      \"method\": \"In vitro cytotoxicity assays; Western blot for caspase-9/PARP cleavage; LC3 conversion assay; autophagic flux measurement; Akt/mTOR phosphorylation analysis; autophagy inhibitor (LY294002) combination; in vivo xenograft tumor models\",\n      \"journal\": \"Cell death discovery\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal mechanistic assays (apoptosis markers, autophagic flux, pathway analysis, inhibitor epistasis, in vivo confirmation); single lab\",\n      \"pmids\": [\"39227365\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"CLDN18.2 undergoes O-GlcNAcylation at threonine-204 (T204), driven cooperatively by KRAS mutation and hyperglycemia. This O-GlcNAcylation promotes cytoplasmic accumulation of CLDN18.2 (rather than membrane localization), enhances pancreatic cancer migration, invasion, and metastasis, and reduces sensitivity to anti-CLDN18.2 targeted therapy. Mechanistically, O-GlcNAcylated CLDN18.2 shows reduced binding to PTP1B, leading to enhanced tyrosine phosphorylation; it also recruits Src via its SH2 domain to trigger Src activation. Genetic (T204A mutation) or pharmacological blockade of O-GlcNAcylation restores membrane localization and suppresses tumor progression.\",\n      \"method\": \"Patient-derived xenograft and organoid models; KPC mice; KPC-Cldn18.2 KO mice; site-specific mutagenesis (T204A); immunoprecipitation; subcellular fractionation; kinase activity assays (Src, PTP1B); KRASG12D inhibitor (MRTX1133) combination studies; migration/invasion assays\",\n      \"journal\": \"Gut\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — site-specific mutagenesis identifying the modified residue, multiple in vivo models (KPC, PDX, organoids), mechanistic binding partners identified (PTP1B, Src), subcellular localization consequence established, pharmacological rescue\",\n      \"pmids\": [\"41513443\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"CD8+ T cells acquire CLDN18.2 from tumor cells via trogocytosis; 'dressed' CLDN18.2 on CD8+ T cells suppresses glucose uptake and glycolysis in those T cells, impairing their cytotoxicity. Mechanistically, trogocytosis-related CLDN18.2 induces GSK3β/CK1α-mediated β-catenin phosphorylation, promoting β-catenin ubiquitination and proteasomal degradation. CLDN18.2 interacts with β-catenin's N-terminal domain via its own C-terminal domain, strengthening the β-catenin/CK1α interaction. CLDN18.2+CD8+ T cells home to bone marrow via CXCL12/CXCR4, skew HSC myeloid differentiation, and induce systemic immune senescence via IL1α.\",\n      \"method\": \"Humanized hCD34+, KPC, Cldn18.2 KO, and PDX/organoid mouse models; flow cytometry; immunofluorescence; single-cell RNA-sequencing; immunoprecipitation-mass spectrometry (IP-MS); peptide (PC18.1) disrupting CLDN18.2/β-catenin interaction; glycolysis assays; ubiquitination assays\",\n      \"journal\": \"Gut\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — IP-MS identifies binding partners, site-specific domain mapping of CLDN18.2/β-catenin interaction, KO models, scRNA-seq, multiple in vivo models, peptide rescue establishes causality\",\n      \"pmids\": [\"41667243\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"CLDN18.2 antibody-drug conjugate (CLDN18.2-307-ADC) binds the extracellular domain of CLDN18.2, is internalized upon binding, and subsequently localizes to the lysosomal compartment, where the MMAE payload is released to induce complete and sustained tumor regression. The parental mAb (CLDN18.2-307) induces ADCC against CLDN18.2-positive cells.\",\n      \"method\": \"Antibody-CLDN18.2 binding assays; internalization and lysosomal co-localization assays; ADCC assays; CDX and PDX xenograft models\",\n      \"journal\": \"Molecular cancer therapeutics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — internalization and lysosomal localization directly demonstrated with functional consequence (tumor regression); single lab with multiple orthogonal methods\",\n      \"pmids\": [\"37788341\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"CLDN18.2 is normally concealed within tight junctions in healthy gastric mucosa; upon malignant transformation and loss of cell polarity, CLDN18.2 epitopes become exposed on the tumor cell surface, making it accessible to antibody targeting. This exposure is the mechanistic basis for selective antibody-dependent cytotoxicity by zolbetuximab.\",\n      \"method\": \"Referenced from preclinical pharmacodynamic studies and review of translational evidence; not a single primary experimental paper but synthesis of mechanistic evidence\",\n      \"journal\": \"Expert review of anticancer therapy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — mechanistic principle supported by multiple preclinical and clinical studies referenced across the corpus; established concept replicated across labs\",\n      \"pmids\": [\"41521591\", \"33610734\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"The Fc fragment of CLDN18.2/CD3 BiTE antibodies interacts with CD64+ cancer-associated fibroblasts (CAFs) via activation of the SYK-VAV2-RhoA-ROCK-MLC2-MRTF-A-α-SMA/collagen-I signaling pathway, enhancing desmoplasia and limiting late-stage T cell infiltration. Vilanterol suppressed BiTE-induced phosphorylation of VAV2 (Y172) in CD64+ CAFs, weakening desmoplasia.\",\n      \"method\": \"Fibroblast-specific Fcgr1 KO mice; flow cytometry; Masson staining; molecular docking; chromatin immunoprecipitation; VAV2 phosphorylation assay; in vivo PDAC models with vilanterol treatment\",\n      \"journal\": \"Gut\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO of CD64 in fibroblasts, molecular docking, chromatin IP, and pharmacological rescue with vilanterol; single lab but multiple orthogonal approaches\",\n      \"pmids\": [\"39187291\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Loss of Cldn18 in mouse lungs leads to the emergence of a distinct population of transitional alveolar progenitors (regeneration-associated transitional progenitors, RATPs), which are epigenetically distinct from damage-associated transitional progenitors (DATPs) and are less fibrogenic. Cldn18 KO mice are protected from bleomycin-induced fibrosis, with accelerated AT2-to-AT1 differentiation as the proposed mechanism. NKX2.1 and AP-1 are active in early transitions and TEAD factors in later stages during AT2-to-AT1 differentiation.\",\n      \"method\": \"Cldn18 KO mouse model; bleomycin fibrosis model; lineage tracing; single-nucleus multiome (RNA + ATAC); transcriptomic and epigenomic characterization of transitional progenitor populations\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO mouse model with lineage tracing and multiome profiling; preprint, not yet peer-reviewed\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"LINC01547-ORF (a small protein encoded by lncRNA LINC01547) interacts physically with CLDN18 protein in colorectal cancer cells (demonstrated by Co-IP and immunofluorescence), reducing CLDN18 ubiquitination and promoting its protein expression. LINC01547-ORF targets CLDN18 to inhibit the FAK/PI3K/AKT signaling pathway, suppressing CRC cell proliferation and migration.\",\n      \"method\": \"Co-immunoprecipitation; immunofluorescence co-localization; ubiquitination assay; Western blot for FAK/PI3K/AKT; protein molecular docking; cell proliferation and migration assays\",\n      \"journal\": \"American journal of cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP validates CLDN18 protein interaction with LINC01547-ORF, ubiquitination reduction measured directly, FAK/AKT pathway placement confirmed by Western blot; single lab\",\n      \"pmids\": [\"39659940\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"IL-1β downregulates claudin-18 expression to promote lung barrier function damage by signaling through the IL-1β-HER2/HER3 axis, contributing to ARDS pathogenesis. This was validated in cell experiments and animal models.\",\n      \"method\": \"Bioinformatics analysis; cell experiments with IL-1β stimulation and measurement of claudin-18 expression; lung barrier function assays; animal ARDS models\",\n      \"journal\": \"Aging\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — abstract describes cell and animal experiments but limited mechanistic detail; single lab, partial pathway characterization\",\n      \"pmids\": [\"32065780\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"SUSD2 exerts tumor-suppressive effects in lung adenocarcinoma through regulation of the cell adhesion molecules pathway via modulation of CLDN18.2, thereby influencing cell adhesion dynamics. Chronic nanoplastic exposure downregulated SUSD2, leading to dysregulation of the SUSD2-CLDN18.2 signaling axis and enhanced malignant phenotypes.\",\n      \"method\": \"Chronic PS-NP exposure model (A549 cells, 6 months); SUSD2 overexpression rescue experiments; multi-omics analysis; cell adhesion and migration assays\",\n      \"journal\": \"Ecotoxicology and environmental safety\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — mechanistic link between SUSD2 and CLDN18.2 inferred from multi-omics; SUSD2 overexpression rescue shown but direct CLDN18.2 functional experiments limited in abstract\",\n      \"pmids\": [\"40882394\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CLDN18 encodes two isoforms (CLDN18.1, lung-specific; CLDN18.2, gastric-specific) that are structural tight junction components; CLDN18.2 is normally sequestered within junctions in gastric mucosa but becomes surface-exposed upon malignant transformation and loss of polarity, enabling immune effector mechanisms (ADCC via NK cells, CDC) when targeted by antibodies like zolbetuximab; CLDN18-ARHGAP26 gene fusions disrupt epithelial integrity by activating RHOA, FAK, and YAP signaling to drive diffuse gastric cancer; CLDN18.1 acts as a tumor suppressor in lung adenocarcinoma by inhibiting IGF-1R/AKT and suppressing YAP/TAZ; CLDN18.2 can undergo O-GlcNAcylation at T204 (driven by KRAS mutation/hyperglycemia), causing cytoplasmic mislocalization and Src activation that promotes cancer progression and therapy resistance; and CLDN18.2 can be acquired by CD8+ T cells via trogocytosis, where it suppresses T cell glycolysis and cytotoxicity through GSK3β/CK1α-mediated β-catenin degradation.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CLDN18 encodes a tight junction structural protein expressed as two tissue-restricted isoforms whose function and oncogenic relevance diverge sharply between lung and gastric/pancreatic tissue [#0, #2]. In lung adenocarcinoma, the lung-specific isoform CLDN18.1 acts as a tumor suppressor, inhibiting IGF-1R and AKT phosphorylation and reducing the YAP/TAZ transcriptional co-activators and their target genes [#2]. In the stomach, a chromosomal rearrangement fusing CLDN18 to ARHGAP26 produces a gain-of-function oncoprotein that disrupts epithelial integrity, causes EMT-like morphology, impaired barrier and adhesion, and increased invasion [#0], and in vivo drives diffuse gastric cancer by activating RHOA, FAK and YAP signaling and inducing signet ring cell formation, cooperating with Trp53 loss [#1]. The gastric isoform CLDN18.2 is a major immunotherapy target: normally concealed within tight junctions, it becomes surface-exposed upon malignant transformation and loss of polarity [#12], enabling antibodies such as zolbetuximab to kill tumor cells via NK-cell ADCC and complement-dependent cytotoxicity [#6, #7], and supporting antibody-drug conjugates that internalize to lysosomes to release cytotoxic payloads [#11, #8]. CLDN18.2 trafficking and signaling are further controlled post-translationally: O-GlcNAcylation at T204, driven by KRAS mutation and hyperglycemia, drives cytoplasmic mislocalization, reduces PTP1B binding, and recruits Src to promote pancreatic cancer progression and therapy resistance [#9]. CLDN18.2 can also be transferred to CD8+ T cells via trogocytosis, where it binds β-catenin through its C-terminal domain to promote GSK3β/CK1α-mediated β-catenin degradation, suppressing T-cell glycolysis and cytotoxicity [#10].\",\n  \"teleology\": [\n    {\n      \"year\": 2003,\n      \"claim\": \"Established the therapeutic principle that surface CLDN18.2 can be exploited for immune-mediated tumor killing, defining the mechanism of anti-CLDN18.2 antibodies.\",\n      \"evidence\": \"ADCC and CDC assays with NK cell depletion plus clinical pharmacodynamic confirmation for zolbetuximab\",\n      \"pmids\": [\"41521591\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Review synthesis rather than single primary dataset\", \"Does not define the molecular determinants of antigen surface exposure\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Resolved how the CLDN18-ARHGAP26 fusion alters cell behavior, showing it abolishes epithelial barrier/adhesion and confers invasion.\",\n      \"evidence\": \"Whole-genome paired-end sequencing for fusion discovery; barrier, adhesion, wound-healing, RHOA, and invasion assays in epithelial cell lines\",\n      \"pmids\": [\"26146084\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Initial model attributed phenotype to RHOA inhibition, later contradicted\", \"Cell-line overexpression rather than physiologic context\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Defined CLDN18.1 as a lung tumor suppressor acting through IGF-1R/AKT and YAP/TAZ, distinguishing isoform-specific function.\",\n      \"evidence\": \"Cldn18-/- mice, rescue in LuAd cell lines, Western blot, siRNA epistasis, xenografts\",\n      \"pmids\": [\"30325015\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct biochemical link between CLDN18.1 and IGF-1R not established\", \"Mechanism of YAP/TAZ suppression unclear\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Identified upstream control of CLDN18 by miR-448 and linked CLDN18.2 to YAP phosphorylation/cytoplasmic retention in gastric cancer.\",\n      \"evidence\": \"Luciferase 3'-UTR reporter, Co-IP, cytoplasmic-nuclear fractionation, in vitro and xenograft assays\",\n      \"pmids\": [\"37023839\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of YAP Ser127 phosphorylation by CLDN18.2 not defined\", \"Single lab\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Overturned the original RHOA-inhibition model, showing the fusion is a gain-of-function oncogene activating RHOA, FAK, and YAP in vivo.\",\n      \"evidence\": \"Transgenic LSL-CLDN18-ARHGAP26 knock-in mice and gastric organoids; RHOA/FAK/YAP biochemistry; FAK/YAP-TEAD inhibitor epistasis\",\n      \"pmids\": [\"38621923\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis for RHOA activation by a GAP-domain-containing fusion unresolved\", \"Relationship to ARHGAP26 catalytic activity unclear\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Connected the fusion to an immunosuppressive microenvironment via PI3K/AKT-mTOR-FAS lipid metabolism favoring Tregs.\",\n      \"evidence\": \"Coculture and xenograft models with PI3K inhibitor and free-fatty-acid measurement\",\n      \"pmids\": [\"39164472\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct CLDN18-fusion-to-PI3K mechanistic link not detailed\", \"Single lab\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Characterized ADC mechanism of action, showing payload-induced apoptosis is opposed by cytoprotective autophagy via Akt/mTOR inactivation.\",\n      \"evidence\": \"Caspase-9/PARP cleavage, LC3 flux, Akt/mTOR analysis, autophagy inhibitor combination, xenografts\",\n      \"pmids\": [\"39227365\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Generality across ADC formats unknown\", \"Single lab\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Identified O-GlcNAcylation at T204 as a metabolic switch controlling CLDN18.2 localization, PTP1B/Src signaling, and therapy resistance.\",\n      \"evidence\": \"Site-specific T204A mutagenesis, KPC/PDX/organoid models, IP, fractionation, Src/PTP1B kinase assays, KRAS inhibitor combination\",\n      \"pmids\": [\"41513443\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Enzyme catalyzing T204 O-GlcNAcylation not identified\", \"Whether modification occurs in gastric versus pancreatic disease unaddressed\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Defined Fc-mediated CLDN18.2/CD3 BiTE engagement of CD64+ CAFs as a driver of desmoplasia limiting T-cell infiltration.\",\n      \"evidence\": \"Fibroblast Fcgr1 KO mice, molecular docking, ChIP, VAV2 phosphorylation assay, vilanterol rescue in PDAC models\",\n      \"pmids\": [\"39187291\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Concerns the antibody Fc, not CLDN18 protein function directly\", \"Single lab\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Identified LINC01547-ORF as a CLDN18-binding micropeptide that stabilizes CLDN18 and suppresses FAK/PI3K/AKT in colorectal cancer.\",\n      \"evidence\": \"Co-IP, immunofluorescence colocalization, ubiquitination assay, Western blot, docking\",\n      \"pmids\": [\"39659940\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single Co-IP-based interaction without reciprocal in vivo validation\", \"Isoform specificity not resolved\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Demonstrated that surface exposure of CLDN18.2 upon loss of polarity is the mechanistic basis for selective antibody targeting.\",\n      \"evidence\": \"Synthesis of preclinical pharmacodynamic and translational evidence\",\n      \"pmids\": [\"41521591\", \"33610734\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Review-level synthesis, not a single primary dataset\", \"Quantitative epitope accessibility not measured\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Revealed a role for Cldn18 loss in promoting less-fibrogenic alveolar transitional progenitors and protection from lung fibrosis.\",\n      \"evidence\": \"Cldn18 KO mice, bleomycin model, lineage tracing, single-nucleus multiome (preprint)\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Preprint, not peer-reviewed\", \"Direct molecular role of CLDN18 in AT2-to-AT1 differentiation undefined\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Uncovered trogocytic transfer of CLDN18.2 to CD8+ T cells as an immune-evasion mechanism via β-catenin degradation and metabolic suppression.\",\n      \"evidence\": \"Humanized/KPC/KO/PDX models, IP-MS, domain mapping, glycolysis and ubiquitination assays, peptide (PC18.1) rescue\",\n      \"pmids\": [\"41667243\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Frequency and clinical relevance of trogocytosis in patients unquantified\", \"Whether antibody therapy alters trogocytic transfer unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the two isoforms' shared tight-junction structural role mechanistically connects their opposing tumor-suppressive (lung) versus oncogenic-target (gastric/pancreatic) behaviors remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unifying structural model linking junction function to signaling outputs\", \"Isoform-specific interactomes incompletely mapped\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [0, 12]},\n      {\"term_id\": \"GO:0098631\", \"supporting_discovery_ids\": [0, 17]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [2, 10]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [9, 11, 12]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [9]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [1, 2, 9]},\n      {\"term_id\": \"R-HSA-1500931\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [6, 7, 10]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [0, 1, 9]}\n    ],\n    \"complexes\": [\"tight junction\"],\n    \"partners\": [\"ARHGAP26\", \"PTP1B\", \"Src\", \"CTNNB1\", \"CK1\\u03b1\", \"LINC01547-ORF\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}