{"gene":"FERMT3","run_date":"2026-06-09T23:54:43","timeline":{"discoveries":[{"year":2008,"finding":"Truncating mutations in FERMT3 (encoding kindlin-3) cause LAD-1/variant syndrome by abrogating kindlin-3 protein expression in leukocytes and platelets, resulting in defective integrin activation. Loss-of-function established by homozygosity mapping, identification of premature stop codons (p.Arg509X, p.Arg573X, p.Trp229X) in independent families, and absence of kindlin-3 protein in patient leukocytes and platelets.","method":"Homozygosity mapping, Sanger sequencing of FERMT3, western blot confirmation of absent kindlin-3 protein in patient leukocytes and platelets","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple independent families with distinct truncating mutations, protein loss confirmed by western blot, replicated across 9 patients from 7 families","pmids":["19064721"],"is_preprint":false},{"year":2003,"finding":"FERMT3/MIG2B encodes a protein containing two plasma-membrane-binding FERM domains and a pleckstrin homology domain; its C. elegans homolog UNC-112 colocalizes with integrin at cell-matrix adhesion complexes, indicating conserved localization at integrin adhesion sites.","method":"Proteomic identification by MALDI-TOF MS from plasma-membrane fractions; bioinformatic domain analysis; literature reference to C. elegans UNC-112 localization","journal":"Leukemia","confidence":"Low","confidence_rationale":"Tier 3 / Weak — domain inference and ortholog localization, no direct functional assay on FERMT3 protein itself","pmids":["12886250"],"is_preprint":false},{"year":2010,"finding":"Homozygous FERMT3 nonsense mutation (R573X) causes severely decreased inside-out activation of integrin αIIbβ3 (GPIIb/IIIa) in platelets, loss of α2β1-integrin response to aggretin-A, impaired Rap-1 activation after PMA stimulation in mononuclear cells, and severely reduced leukocyte adhesion to VCAM-1 and endothelial cells. Hematopoietic stem cell transplantation normalised these integrin-dependent functions.","method":"Flow cytometry (fibrinogen binding), platelet aggregation and granule secretion assays, Rap-1 activation assay, cell adhesion assay to VCAM-1 and endothelial cells, HSCT rescue experiment","journal":"Thrombosis and haemostasis","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal functional assays in patient cells with defined FERMT3 mutation, plus HSCT rescue confirming causal role","pmids":["20216991"],"is_preprint":false},{"year":2017,"finding":"FERMT3 knockdown suppresses glioblastoma cell proliferation and chemoresistance to temozolomide, and FERMT3 regulates glioma cell activity through integrin-mediated Wnt/β-catenin signaling, as demonstrated by TOPflash/FOPflash reporter assays and western blot.","method":"siRNA knockdown, cell proliferation assay, TOPflash/FOPflash Wnt reporter assay, western blot for integrin activation and β-catenin pathway components","journal":"Neuroscience letters","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — two orthogonal readouts (reporter assay + western blot) in single lab, no rescue or mutagenesis","pmids":["28778805"],"is_preprint":false},{"year":2021,"finding":"Overexpression of FERMT3 inhibits cigarette smoke extract-induced epithelial-mesenchymal transition (EMT), cell migration, and cell cycle progression in A549 lung epithelial cells through inhibition of Wnt/β-catenin signaling.","method":"FERMT3 overexpression, western blot for EMT markers and Wnt/β-catenin pathway components, cell migration assay, cell cycle analysis","journal":"Respiratory research","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — multiple cellular readouts (EMT markers, migration, cell cycle) with western blot pathway confirmation, single lab","pmids":["34742298"],"is_preprint":false},{"year":2022,"finding":"FERMT3 overexpression suppresses CRC cell invasion and chemoresistance to 5-FU, and enhances NK cell-mediated killing of CRC cells, mechanistically by inhibiting Wnt/β-catenin signaling and reducing downstream PD-L1 expression. Reactivation of Wnt/β-catenin with a specific agonist reversed these FERMT3-mediated effects.","method":"FERMT3 overexpression and knockdown, invasion assay, cell viability/apoptosis assay, caspase-3 activity, NK cell co-culture cytotoxicity assay, western blot for β-catenin/PD-L1, Wnt agonist rescue experiment","journal":"Clinical and experimental pharmacology & physiology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — multiple orthogonal assays (invasion, apoptosis, NK killing, western blot) plus pathway rescue, single lab","pmids":["35672907"],"is_preprint":false},{"year":2025,"finding":"FERMT3 is highly expressed in macrophages and fibroblasts in keloid tissue; in vitro modulation of FERMT3 in these cell types significantly altered their metabolic profiles (glycolysis, oxidative phosphorylation), inflammatory cytokine production, proliferation, and migration.","method":"scRNA-seq localization, in vitro FERMT3 modulation in macrophages and fibroblasts, metabolic profiling (glycolysis/OXPHOS assays), cytokine measurement, proliferation and migration assays","journal":"Functional & integrative genomics","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — multiple orthogonal in vitro readouts (metabolism, cytokines, proliferation, migration) in single lab with scRNA-seq localization","pmids":["40928556"],"is_preprint":false}],"current_model":"FERMT3 encodes kindlin-3, a FERM-domain adaptor protein expressed in hematopoietic cells (leukocytes and platelets) that is essential for inside-out integrin activation (including αIIbβ3 and β2-integrins) and localizes to focal adhesions; loss-of-function mutations ablating kindlin-3 expression cause LAD-III by preventing integrin-mediated platelet aggregation and leukocyte adhesion, while in non-hematopoietic contexts FERMT3 also modulates Wnt/β-catenin signaling to regulate EMT, cell proliferation, chemoresistance, and immune evasion."},"narrative":{"mechanistic_narrative":"FERMT3 encodes kindlin-3, a FERM-domain adaptor protein required for integrin function in hematopoietic cells [PMID:19064721, PMID:20216991]. Truncating loss-of-function mutations that ablate kindlin-3 protein in leukocytes and platelets cause leukocyte adhesion deficiency type III (LAD-1/variant syndrome), establishing kindlin-3 as essential for inside-out integrin activation [PMID:19064721]. In patient cells lacking functional kindlin-3, activation of the platelet integrin αIIbβ3, the α2β1-integrin response, Rap-1 activation, and leukocyte adhesion to VCAM-1 and endothelium are all severely impaired, and these defects are corrected by hematopoietic stem cell transplantation, confirming the causal hematopoietic role [PMID:20216991]. Beyond its canonical integrin function, FERMT3 modulates Wnt/β-catenin signaling across non-hematopoietic contexts: it acts through integrin-mediated Wnt/β-catenin signaling to regulate glioma proliferation and temozolomide chemoresistance [PMID:28778805], inhibits Wnt/β-catenin to suppress smoke-induced EMT, migration, and cell-cycle progression in lung epithelial cells [PMID:34742298], and suppresses colorectal cancer invasion and 5-FU resistance while enhancing NK-cell killing by lowering β-catenin-driven PD-L1 expression [PMID:35672907]. FERMT3 is also expressed in keloid macrophages and fibroblasts, where its modulation alters cellular metabolism, cytokine output, proliferation, and migration [PMID:40928556].","teleology":[{"year":2003,"claim":"Established the domain architecture and likely localization of the FERMT3 product, framing it as a candidate membrane adaptor at integrin adhesion sites before any direct function was known.","evidence":"Proteomic identification from plasma-membrane fractions with bioinformatic domain analysis and reference to C. elegans UNC-112 colocalization with integrin","pmids":["12886250"],"confidence":"Low","gaps":["No direct functional assay performed on the FERMT3 protein itself","Integrin localization inferred from an ortholog, not demonstrated for human kindlin-3","No interactome or activation mechanism defined"]},{"year":2008,"claim":"Answered whether FERMT3 is genetically required for integrin function in humans by showing truncating mutations ablate kindlin-3 protein and cause LAD-1/variant syndrome.","evidence":"Homozygosity mapping and Sanger sequencing identifying premature stop codons across independent families, with western blot confirming absent protein in patient leukocytes and platelets","pmids":["19064721"],"confidence":"High","gaps":["Molecular mechanism by which kindlin-3 activates integrins not resolved at structural level","Did not dissect cell-type-specific contributions"]},{"year":2010,"claim":"Defined the functional consequences of kindlin-3 loss and proved causality, showing impaired inside-out activation of multiple integrins and Rap-1 signaling that is reversed by transplantation.","evidence":"Flow cytometry, platelet aggregation/secretion, Rap-1 activation, adhesion assays in patient cells with the R573X mutation, plus HSCT rescue","pmids":["20216991"],"confidence":"High","gaps":["Direct biochemical link between kindlin-3 and Rap-1 not established","Order of events in the integrin activation cascade not resolved"]},{"year":2017,"claim":"Extended FERMT3 function beyond hematopoietic adhesion by linking it to integrin-mediated Wnt/β-catenin signaling controlling glioma proliferation and chemoresistance.","evidence":"siRNA knockdown with proliferation assays, TOPflash/FOPflash Wnt reporter, and western blot in glioblastoma cells","pmids":["28778805"],"confidence":"Medium","gaps":["No rescue or mutagenesis to confirm specificity","Mechanistic coupling between integrin and Wnt not biochemically defined","Single cancer context"]},{"year":2021,"claim":"Showed FERMT3 can act as a suppressor of EMT and migration through Wnt/β-catenin inhibition in non-cancer epithelial cells under environmental stress.","evidence":"FERMT3 overexpression with EMT-marker and Wnt pathway western blots, migration assay, and cell-cycle analysis in A549 cells","pmids":["34742298"],"confidence":"Medium","gaps":["Single cell line and single lab","Direction of effect opposite to glioma context not reconciled mechanistically","No loss-of-function confirmation"]},{"year":2022,"claim":"Connected FERMT3-mediated Wnt suppression to tumor immune evasion by demonstrating that lowering β-catenin reduces PD-L1 and enhances NK-cell killing in colorectal cancer.","evidence":"Overexpression/knockdown with invasion, apoptosis, NK co-culture cytotoxicity assays, β-catenin/PD-L1 western blots, and Wnt-agonist rescue","pmids":["35672907"],"confidence":"Medium","gaps":["Single lab without in vivo validation","Mechanism linking FERMT3 to β-catenin level not defined","PD-L1 regulation shown correlatively at protein level"]},{"year":2025,"claim":"Identified a stromal/immune expression niche for FERMT3 in keloid tissue and linked it to cellular metabolism and inflammatory output.","evidence":"scRNA-seq localization plus in vitro modulation in macrophages and fibroblasts with metabolic, cytokine, proliferation, and migration assays","pmids":["40928556"],"confidence":"Medium","gaps":["Molecular pathway linking FERMT3 to metabolic reprogramming not defined","Correlative single-lab data without genetic rescue","Integrin or Wnt involvement not tested in this context"]},{"year":null,"claim":"How kindlin-3's canonical integrin-activation function mechanistically connects to the context-dependent Wnt/β-catenin modulation reported in non-hematopoietic cells remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural or biochemical mechanism coupling integrin engagement to β-catenin levels","Opposing effects across tissues not reconciled","No in vivo demonstration of the Wnt-regulatory role"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,2]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[2]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[1]}],"pathway":[{"term_id":"R-HSA-109582","term_label":"Hemostasis","supporting_discovery_ids":[2]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[2,5]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[3,4,5]}],"complexes":[],"partners":[],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q86UX7","full_name":"Fermitin family homolog 3","aliases":["Kindlin-3","MIG2-like protein","Unc-112-related protein 2"],"length_aa":667,"mass_kda":76.0,"function":"Plays a central role in cell adhesion in hematopoietic cells (PubMed:19234463, PubMed:26359933). Acts by activating the integrin beta-1-3 (ITGB1, ITGB2 and ITGB3) (By similarity). Required for integrin-mediated platelet adhesion and leukocyte adhesion to endothelial cells (PubMed:19234460). Required for activation of integrin beta-2 (ITGB2) in polymorphonuclear granulocytes (PMNs) (By similarity) Isoform 2 may act as a repressor of NF-kappa-B and apoptosis","subcellular_location":"Cell projection, podosome","url":"https://www.uniprot.org/uniprotkb/Q86UX7/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/FERMT3","classification":"Not Classified","n_dependent_lines":20,"n_total_lines":1208,"dependency_fraction":0.016556291390728478},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/FERMT3","total_profiled":1310},"omim":[{"mim_id":"612840","title":"LEUKOCYTE ADHESION DEFICIENCY, TYPE III; LAD3","url":"https://www.omim.org/entry/612840"},{"mim_id":"607901","title":"FERM DOMAIN-CONTAINING KINDLIN 3; FERMT3","url":"https://www.omim.org/entry/607901"},{"mim_id":"116920","title":"LEUKOCYTE ADHESION DEFICIENCY, TYPE I; LAD1","url":"https://www.omim.org/entry/116920"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Vesicles","reliability":"Approved"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"bone marrow","ntpm":95.6},{"tissue":"lymphoid tissue","ntpm":125.3}],"url":"https://www.proteinatlas.org/search/FERMT3"},"hgnc":{"alias_symbol":["URP2","KIND3","MIG2B","MGC10966","UNC112C"],"prev_symbol":[]},"alphafold":{"accession":"Q86UX7","domains":[{"cath_id":"3.10.20.90","chopping":"14-95","consensus_level":"high","plddt":90.9807,"start":14,"end":95},{"cath_id":"3.10.20.90","chopping":"98-146_159-252","consensus_level":"high","plddt":90.5731,"start":98,"end":252},{"cath_id":"2.30.29.30","chopping":"350-362_372-461","consensus_level":"medium","plddt":86.1452,"start":350,"end":461},{"cath_id":"2.30.29.30","chopping":"555-661","consensus_level":"high","plddt":89.6229,"start":555,"end":661}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q86UX7","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q86UX7-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q86UX7-F1-predicted_aligned_error_v6.png","plddt_mean":82.94},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=FERMT3","jax_strain_url":"https://www.jax.org/strain/search?query=FERMT3"},"sequence":{"accession":"Q86UX7","fasta_url":"https://rest.uniprot.org/uniprotkb/Q86UX7.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q86UX7/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q86UX7"}},"corpus_meta":[{"pmid":"19064721","id":"PMC_19064721","title":"LAD-1/variant syndrome is caused by mutations in FERMT3.","date":"2008","source":"Blood","url":"https://pubmed.ncbi.nlm.nih.gov/19064721","citation_count":174,"is_preprint":false},{"pmid":"12886250","id":"PMC_12886250","title":"Proteomic analysis of the cell-surface membrane in chronic lymphocytic leukemia: identification of two novel proteins, BCNP1 and MIG2B.","date":"2003","source":"Leukemia","url":"https://pubmed.ncbi.nlm.nih.gov/12886250","citation_count":61,"is_preprint":false},{"pmid":"20216991","id":"PMC_20216991","title":"Novel integrin-dependent platelet malfunction in siblings with leukocyte adhesion deficiency-III (LAD-III) caused by a point mutation in FERMT3.","date":"2010","source":"Thrombosis and haemostasis","url":"https://pubmed.ncbi.nlm.nih.gov/20216991","citation_count":50,"is_preprint":false},{"pmid":"25781313","id":"PMC_25781313","title":"Comparative distribution and in vitro activities of the urotensin II-related peptides URP1 and URP2 in zebrafish: evidence for their colocalization in spinal cerebrospinal fluid-contacting neurons.","date":"2015","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/25781313","citation_count":41,"is_preprint":false},{"pmid":"26188538","id":"PMC_26188538","title":"Kindlin 3 (FERMT3) is associated with unstable atherosclerotic plaques, anti-inflammatory type II macrophages and upregulation of beta-2 integrins in all major arterial beds.","date":"2015","source":"Atherosclerosis","url":"https://pubmed.ncbi.nlm.nih.gov/26188538","citation_count":38,"is_preprint":false},{"pmid":"28778805","id":"PMC_28778805","title":"FERMT3 contributes to glioblastoma cell proliferation and chemoresistance to temozolomide through integrin mediated Wnt signaling.","date":"2017","source":"Neuroscience letters","url":"https://pubmed.ncbi.nlm.nih.gov/28778805","citation_count":28,"is_preprint":false},{"pmid":"34742298","id":"PMC_34742298","title":"FERMT3 mediates cigarette smoke-induced epithelial-mesenchymal transition through Wnt/β-catenin signaling.","date":"2021","source":"Respiratory research","url":"https://pubmed.ncbi.nlm.nih.gov/34742298","citation_count":26,"is_preprint":false},{"pmid":"8021936","id":"PMC_8021936","title":"Suppression of yeast RNA polymerase III mutations by the URP2 gene encoding a protein homologous to the mammalian ribosomal protein S20.","date":"1994","source":"Journal of molecular biology","url":"https://pubmed.ncbi.nlm.nih.gov/8021936","citation_count":22,"is_preprint":false},{"pmid":"36453722","id":"PMC_36453722","title":"Urotensin II-related peptides, Urp1 and Urp2, control zebrafish spine morphology.","date":"2022","source":"eLife","url":"https://pubmed.ncbi.nlm.nih.gov/36453722","citation_count":21,"is_preprint":false},{"pmid":"31068971","id":"PMC_31068971","title":"A Novel Nonsense Mutation in FERMT3 Causes LAD-III in a Pakistani Family.","date":"2019","source":"Frontiers in genetics","url":"https://pubmed.ncbi.nlm.nih.gov/31068971","citation_count":13,"is_preprint":false},{"pmid":"35672907","id":"PMC_35672907","title":"Blockage of PD-L1 by FERMT3-mediated Wnt/β-catenin signalling regulates chemoresistance and immune evasion of colorectal cancer cells.","date":"2022","source":"Clinical and experimental pharmacology & physiology","url":"https://pubmed.ncbi.nlm.nih.gov/35672907","citation_count":13,"is_preprint":false},{"pmid":"28095295","id":"PMC_28095295","title":"Hematopoietic stem cell transplantation corrects osteopetrosis in a child carrying a novel homozygous mutation in the FERMT3 gene.","date":"2017","source":"Bone","url":"https://pubmed.ncbi.nlm.nih.gov/28095295","citation_count":10,"is_preprint":false},{"pmid":"31724816","id":"PMC_31724816","title":"Novel variants in FERMT3 and RASGRP2-Genetic linkage in Glanzmann-like bleeding disorders.","date":"2019","source":"Pediatric blood & cancer","url":"https://pubmed.ncbi.nlm.nih.gov/31724816","citation_count":8,"is_preprint":false},{"pmid":"36648575","id":"PMC_36648575","title":"A Novel Deletion in FERMT3 Causes LAD-III in a Turkish Family.","date":"2023","source":"Journal of clinical immunology","url":"https://pubmed.ncbi.nlm.nih.gov/36648575","citation_count":6,"is_preprint":false},{"pmid":"38269242","id":"PMC_38269242","title":"LAD-III, a Mild Phenotype Resulting From a Novel Variant of FERMT3 Gene: A Case Report.","date":"2023","source":"Cureus","url":"https://pubmed.ncbi.nlm.nih.gov/38269242","citation_count":2,"is_preprint":false},{"pmid":"38255822","id":"PMC_38255822","title":"Immune-Related Molecules CD3G and FERMT3: Novel Biomarkers Associated with Sepsis.","date":"2024","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/38255822","citation_count":1,"is_preprint":false},{"pmid":"38162163","id":"PMC_38162163","title":"Novel FERMT3 and PTPRQ Mutations Associated with Leukocyte Adhesion Deficiency-III and Sensorineural Hearing Loss.","date":"2021","source":"Journal of pediatric genetics","url":"https://pubmed.ncbi.nlm.nih.gov/38162163","citation_count":0,"is_preprint":false},{"pmid":"40928556","id":"PMC_40928556","title":"Integrative analysis identifies FERMT3 as a key regulator of metabolic reprogramming in keloid scarring and metabolic syndrome.","date":"2025","source":"Functional & integrative genomics","url":"https://pubmed.ncbi.nlm.nih.gov/40928556","citation_count":0,"is_preprint":false},{"pmid":"40078257","id":"PMC_40078257","title":"A Novel Variant of the FERMT3 Gene Associated With Leukocyte Adhesion Deficiency Type III (LAD-III) in a Saudi Family: A Case Series.","date":"2025","source":"Cureus","url":"https://pubmed.ncbi.nlm.nih.gov/40078257","citation_count":0,"is_preprint":false},{"pmid":"41855990","id":"PMC_41855990","title":"Typical persistent organic pollutant exposure induces body axial curvature through binding to Kdm1a transcriptionally activating expression of urp2 in zebrafish.","date":"2026","source":"Journal of hazardous materials","url":"https://pubmed.ncbi.nlm.nih.gov/41855990","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":12290,"output_tokens":1953,"usd":0.033083,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":8894,"output_tokens":2734,"usd":0.05641,"stage2_stop_reason":"end_turn"},"total_usd":0.089493,"stage1_batch_id":"msgbatch_01AsR7g8dGTEiEw9U83bJeWn","stage2_batch_id":"msgbatch_01YV5ZyxtFNUZEjxRcpd9jzb","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2008,\n      \"finding\": \"Truncating mutations in FERMT3 (encoding kindlin-3) cause LAD-1/variant syndrome by abrogating kindlin-3 protein expression in leukocytes and platelets, resulting in defective integrin activation. Loss-of-function established by homozygosity mapping, identification of premature stop codons (p.Arg509X, p.Arg573X, p.Trp229X) in independent families, and absence of kindlin-3 protein in patient leukocytes and platelets.\",\n      \"method\": \"Homozygosity mapping, Sanger sequencing of FERMT3, western blot confirmation of absent kindlin-3 protein in patient leukocytes and platelets\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple independent families with distinct truncating mutations, protein loss confirmed by western blot, replicated across 9 patients from 7 families\",\n      \"pmids\": [\"19064721\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"FERMT3/MIG2B encodes a protein containing two plasma-membrane-binding FERM domains and a pleckstrin homology domain; its C. elegans homolog UNC-112 colocalizes with integrin at cell-matrix adhesion complexes, indicating conserved localization at integrin adhesion sites.\",\n      \"method\": \"Proteomic identification by MALDI-TOF MS from plasma-membrane fractions; bioinformatic domain analysis; literature reference to C. elegans UNC-112 localization\",\n      \"journal\": \"Leukemia\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — domain inference and ortholog localization, no direct functional assay on FERMT3 protein itself\",\n      \"pmids\": [\"12886250\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Homozygous FERMT3 nonsense mutation (R573X) causes severely decreased inside-out activation of integrin αIIbβ3 (GPIIb/IIIa) in platelets, loss of α2β1-integrin response to aggretin-A, impaired Rap-1 activation after PMA stimulation in mononuclear cells, and severely reduced leukocyte adhesion to VCAM-1 and endothelial cells. Hematopoietic stem cell transplantation normalised these integrin-dependent functions.\",\n      \"method\": \"Flow cytometry (fibrinogen binding), platelet aggregation and granule secretion assays, Rap-1 activation assay, cell adhesion assay to VCAM-1 and endothelial cells, HSCT rescue experiment\",\n      \"journal\": \"Thrombosis and haemostasis\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal functional assays in patient cells with defined FERMT3 mutation, plus HSCT rescue confirming causal role\",\n      \"pmids\": [\"20216991\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"FERMT3 knockdown suppresses glioblastoma cell proliferation and chemoresistance to temozolomide, and FERMT3 regulates glioma cell activity through integrin-mediated Wnt/β-catenin signaling, as demonstrated by TOPflash/FOPflash reporter assays and western blot.\",\n      \"method\": \"siRNA knockdown, cell proliferation assay, TOPflash/FOPflash Wnt reporter assay, western blot for integrin activation and β-catenin pathway components\",\n      \"journal\": \"Neuroscience letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — two orthogonal readouts (reporter assay + western blot) in single lab, no rescue or mutagenesis\",\n      \"pmids\": [\"28778805\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Overexpression of FERMT3 inhibits cigarette smoke extract-induced epithelial-mesenchymal transition (EMT), cell migration, and cell cycle progression in A549 lung epithelial cells through inhibition of Wnt/β-catenin signaling.\",\n      \"method\": \"FERMT3 overexpression, western blot for EMT markers and Wnt/β-catenin pathway components, cell migration assay, cell cycle analysis\",\n      \"journal\": \"Respiratory research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — multiple cellular readouts (EMT markers, migration, cell cycle) with western blot pathway confirmation, single lab\",\n      \"pmids\": [\"34742298\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"FERMT3 overexpression suppresses CRC cell invasion and chemoresistance to 5-FU, and enhances NK cell-mediated killing of CRC cells, mechanistically by inhibiting Wnt/β-catenin signaling and reducing downstream PD-L1 expression. Reactivation of Wnt/β-catenin with a specific agonist reversed these FERMT3-mediated effects.\",\n      \"method\": \"FERMT3 overexpression and knockdown, invasion assay, cell viability/apoptosis assay, caspase-3 activity, NK cell co-culture cytotoxicity assay, western blot for β-catenin/PD-L1, Wnt agonist rescue experiment\",\n      \"journal\": \"Clinical and experimental pharmacology & physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — multiple orthogonal assays (invasion, apoptosis, NK killing, western blot) plus pathway rescue, single lab\",\n      \"pmids\": [\"35672907\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"FERMT3 is highly expressed in macrophages and fibroblasts in keloid tissue; in vitro modulation of FERMT3 in these cell types significantly altered their metabolic profiles (glycolysis, oxidative phosphorylation), inflammatory cytokine production, proliferation, and migration.\",\n      \"method\": \"scRNA-seq localization, in vitro FERMT3 modulation in macrophages and fibroblasts, metabolic profiling (glycolysis/OXPHOS assays), cytokine measurement, proliferation and migration assays\",\n      \"journal\": \"Functional & integrative genomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — multiple orthogonal in vitro readouts (metabolism, cytokines, proliferation, migration) in single lab with scRNA-seq localization\",\n      \"pmids\": [\"40928556\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"FERMT3 encodes kindlin-3, a FERM-domain adaptor protein expressed in hematopoietic cells (leukocytes and platelets) that is essential for inside-out integrin activation (including αIIbβ3 and β2-integrins) and localizes to focal adhesions; loss-of-function mutations ablating kindlin-3 expression cause LAD-III by preventing integrin-mediated platelet aggregation and leukocyte adhesion, while in non-hematopoietic contexts FERMT3 also modulates Wnt/β-catenin signaling to regulate EMT, cell proliferation, chemoresistance, and immune evasion.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"FERMT3 encodes kindlin-3, a FERM-domain adaptor protein required for integrin function in hematopoietic cells [#0, #2]. Truncating loss-of-function mutations that ablate kindlin-3 protein in leukocytes and platelets cause leukocyte adhesion deficiency type III (LAD-1/variant syndrome), establishing kindlin-3 as essential for inside-out integrin activation [#0]. In patient cells lacking functional kindlin-3, activation of the platelet integrin αIIbβ3, the α2β1-integrin response, Rap-1 activation, and leukocyte adhesion to VCAM-1 and endothelium are all severely impaired, and these defects are corrected by hematopoietic stem cell transplantation, confirming the causal hematopoietic role [#2]. Beyond its canonical integrin function, FERMT3 modulates Wnt/β-catenin signaling across non-hematopoietic contexts: it acts through integrin-mediated Wnt/β-catenin signaling to regulate glioma proliferation and temozolomide chemoresistance [#3], inhibits Wnt/β-catenin to suppress smoke-induced EMT, migration, and cell-cycle progression in lung epithelial cells [#4], and suppresses colorectal cancer invasion and 5-FU resistance while enhancing NK-cell killing by lowering β-catenin-driven PD-L1 expression [#5]. FERMT3 is also expressed in keloid macrophages and fibroblasts, where its modulation alters cellular metabolism, cytokine output, proliferation, and migration [#6].\",\n  \"teleology\": [\n    {\n      \"year\": 2003,\n      \"claim\": \"Established the domain architecture and likely localization of the FERMT3 product, framing it as a candidate membrane adaptor at integrin adhesion sites before any direct function was known.\",\n      \"evidence\": \"Proteomic identification from plasma-membrane fractions with bioinformatic domain analysis and reference to C. elegans UNC-112 colocalization with integrin\",\n      \"pmids\": [\"12886250\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No direct functional assay performed on the FERMT3 protein itself\", \"Integrin localization inferred from an ortholog, not demonstrated for human kindlin-3\", \"No interactome or activation mechanism defined\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Answered whether FERMT3 is genetically required for integrin function in humans by showing truncating mutations ablate kindlin-3 protein and cause LAD-1/variant syndrome.\",\n      \"evidence\": \"Homozygosity mapping and Sanger sequencing identifying premature stop codons across independent families, with western blot confirming absent protein in patient leukocytes and platelets\",\n      \"pmids\": [\"19064721\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism by which kindlin-3 activates integrins not resolved at structural level\", \"Did not dissect cell-type-specific contributions\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Defined the functional consequences of kindlin-3 loss and proved causality, showing impaired inside-out activation of multiple integrins and Rap-1 signaling that is reversed by transplantation.\",\n      \"evidence\": \"Flow cytometry, platelet aggregation/secretion, Rap-1 activation, adhesion assays in patient cells with the R573X mutation, plus HSCT rescue\",\n      \"pmids\": [\"20216991\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct biochemical link between kindlin-3 and Rap-1 not established\", \"Order of events in the integrin activation cascade not resolved\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Extended FERMT3 function beyond hematopoietic adhesion by linking it to integrin-mediated Wnt/β-catenin signaling controlling glioma proliferation and chemoresistance.\",\n      \"evidence\": \"siRNA knockdown with proliferation assays, TOPflash/FOPflash Wnt reporter, and western blot in glioblastoma cells\",\n      \"pmids\": [\"28778805\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No rescue or mutagenesis to confirm specificity\", \"Mechanistic coupling between integrin and Wnt not biochemically defined\", \"Single cancer context\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Showed FERMT3 can act as a suppressor of EMT and migration through Wnt/β-catenin inhibition in non-cancer epithelial cells under environmental stress.\",\n      \"evidence\": \"FERMT3 overexpression with EMT-marker and Wnt pathway western blots, migration assay, and cell-cycle analysis in A549 cells\",\n      \"pmids\": [\"34742298\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single cell line and single lab\", \"Direction of effect opposite to glioma context not reconciled mechanistically\", \"No loss-of-function confirmation\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Connected FERMT3-mediated Wnt suppression to tumor immune evasion by demonstrating that lowering β-catenin reduces PD-L1 and enhances NK-cell killing in colorectal cancer.\",\n      \"evidence\": \"Overexpression/knockdown with invasion, apoptosis, NK co-culture cytotoxicity assays, β-catenin/PD-L1 western blots, and Wnt-agonist rescue\",\n      \"pmids\": [\"35672907\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab without in vivo validation\", \"Mechanism linking FERMT3 to β-catenin level not defined\", \"PD-L1 regulation shown correlatively at protein level\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Identified a stromal/immune expression niche for FERMT3 in keloid tissue and linked it to cellular metabolism and inflammatory output.\",\n      \"evidence\": \"scRNA-seq localization plus in vitro modulation in macrophages and fibroblasts with metabolic, cytokine, proliferation, and migration assays\",\n      \"pmids\": [\"40928556\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular pathway linking FERMT3 to metabolic reprogramming not defined\", \"Correlative single-lab data without genetic rescue\", \"Integrin or Wnt involvement not tested in this context\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How kindlin-3's canonical integrin-activation function mechanistically connects to the context-dependent Wnt/β-catenin modulation reported in non-hematopoietic cells remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural or biochemical mechanism coupling integrin engagement to β-catenin levels\", \"Opposing effects across tissues not reconciled\", \"No in vivo demonstration of the Wnt-regulatory role\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 2]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [2]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-109582\", \"supporting_discovery_ids\": [2]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [2, 5]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [3, 4, 5]}\n    ],\n    \"complexes\": [],\n    \"partners\": [],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}