{"gene":"FCGBP","run_date":"2026-06-09T23:54:43","timeline":{"discoveries":[{"year":1997,"finding":"The N-terminal 450-amino acid sequence of FCGBP is necessary and sufficient to confer IgG Fc binding activity, and the protein contains 12 occurrences of a 400-amino acid cysteine-rich unit resembling mucin, with a conserved CGLCGN motif shared with MUC2 and prepro-von Willebrand factor.","method":"cDNA cloning, sequence analysis, domain deletion/expression assay for IgG Fc binding activity","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — direct in vitro binding assay with defined N-terminal domain mapped as necessary and sufficient; single lab but multiple orthogonal methods (cloning, sequencing, functional binding assay)","pmids":["9182547"],"is_preprint":false},{"year":2002,"finding":"FCGBP is expressed in mucin-secreting cells of the colon, small intestine, gall bladder, biliary tract, bronchus, submandibular gland, and cervix uteri (but not conjunctival mucin cells), is present in their secreted fluids with retained IgG-binding activity, and suppresses complement-mediated haemolysis of sheep red blood cells in vitro.","method":"Immunohistochemistry, immunodotblot, immunoprecipitation with monoclonal antibodies, complement-mediated haemolysis inhibition assay","journal":"Gut","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (IHC, immunoprecipitation, functional haemolysis assay) in a single lab study establishing both localization and a functional activity","pmids":["12117874"],"is_preprint":false},{"year":2001,"finding":"FCGBP antigen is detectable at elevated levels in serum of patients with autoimmune diseases (particularly progressive systemic sclerosis), establishing that FCGBP is secreted into circulation from goblet cells.","method":"ELISA, immunoprecipitation with anti-FCGBP monoclonal antibodies on patient sera","journal":"Immunology letters","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, single immunoassay method; no mechanistic dissection beyond detection","pmids":["11600203"],"is_preprint":false},{"year":2005,"finding":"FCGBP protein was identified among the most abundant proteins in murine faeces, confirming its secretion from intestinal goblet cells into the gut lumen.","method":"Two-dimensional gel electrophoresis and MALDI-TOF mass spectrometry of mouse stool proteins","journal":"Biomarkers","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — direct protein identification by mass spectrometry in a defined compartment (gut lumen/faeces), single study","pmids":["16097391"],"is_preprint":false},{"year":2020,"finding":"In the aging olfactory epithelium, exhausted horizontal basal stem cells differentiate into metaplastic respiratory cells that secrete FCGBP (a mucin-like mucus barrier protein), linking FCGBP expression to a specific cell-lineage commitment event driven by altered retinoic acid metabolism.","method":"In vivo mouse genetic model (CYP26B1 overexpression, repeated injury, aging), live imaging, immunofluorescence, lineage tracing","journal":"The Journal of neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — defined cellular phenotype with loss-of-function/gain-of-function genetic models; FCGBP used as a marker of the metaplastic cell fate rather than being functionally dissected itself; single lab","pmids":["32385093"],"is_preprint":false},{"year":2021,"finding":"FCGBP is expressed by mucous bronchial gland cells and some airway goblet cells, and is proposed (with prior experimental support cited from earlier work) to transport serum IgG onto mucosal surfaces, trap IgG-bound virus, and suppress complement fixation by competing with macrophage Fc binding.","method":"Immunohistochemistry (immunoreactivity for FCGBP in airway cells); review integrating prior experimental findings","journal":"Innate immunity","confidence":"Low","confidence_rationale":"Tier 3 / Weak — new localization data (IHC in airway tissue) from a single lab; functional claims are largely reiterated from prior work rather than newly demonstrated","pmids":["34521229"],"is_preprint":false},{"year":2024,"finding":"A variant in FCGBP (rs1326680184) reduces serum FCGBP levels; Fcgbp-knockdown mice showed more severe acute pancreatitis morphology and higher risk of hemorrhage; FCGBP-knockdown human vascular fibroblasts demonstrated destabilized vascular walls and increased vascular injury, indicating FCGBP contributes to vascular wall stability.","method":"Whole-exome sequencing, serum ELISA, in vivo Fcgbp-knockdown mouse model, in vitro FCGBP-knockdown human vascular fibroblasts","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function in both in vivo (mouse KD) and in vitro (human cell KD) models with defined phenotypic readouts; preprint, not yet peer-reviewed","pmids":["bio_10.1101_2024.08.06.24311443"],"is_preprint":true},{"year":1991,"finding":"An intracellular ~45–50 kDa IgG Fc-binding protein (designated Fc gamma BP in that study) is induced by alpha-interferon in human cells; it binds human IgG but not IgM, IgA, or IgE; it is a phosphoprotein whose phosphorylation increases after alpha-IFN treatment; and it is not detectable on the cell surface.","method":"Immunoprecipitation from [35S]methionine-labeled cells, cell-surface binding assays, phosphorylation analysis","journal":"Journal of immunology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, single immunoprecipitation method; the described 45–50 kDa intracellular protein induced by IFN-α is distinct from the large secretory FCGBP (16 kb mRNA) cloned in 1997; may represent a different protein sharing the 'FcgammaBP' name; low confidence for assignment to canonical FCGBP locus","pmids":["1825221"],"is_preprint":false}],"current_model":"FCGBP is a very large (~16 kb mRNA), mucin-like secretory protein expressed by goblet and other mucin-producing epithelial cells at mucosal surfaces; its N-terminal 450 amino acids are necessary and sufficient for IgG Fc binding, it is secreted into mucus and several body fluids where it retains IgG-binding activity and can suppress complement-mediated haemolysis, and in vascular contexts loss of FCGBP destabilizes the vascular wall, suggesting an additional role in maintaining vascular integrity."},"narrative":{"mechanistic_narrative":"FCGBP is a very large mucin-like protein secreted by goblet and other mucin-producing epithelial cells at mucosal surfaces, where it functions in mucosal immune defense [PMID:9182547, PMID:12117874]. Its N-terminal 450 amino acids are necessary and sufficient to confer IgG Fc binding activity, and the protein is built from repeated ~400-amino acid cysteine-rich units containing a CGLCGN motif shared with the mucins MUC2 and von Willebrand factor [PMID:9182547]. FCGBP is expressed in mucin-secreting cells across the colon, small intestine, gall bladder, biliary tract, bronchus, submandibular gland, and cervix, is released into their secreted fluids and the gut lumen with retained IgG-binding activity, and suppresses complement-mediated haemolysis in vitro [PMID:12117874, PMID:16097391]. Loss-of-function in human vascular fibroblasts and Fcgbp-knockdown mice destabilizes the vascular wall and increases vascular injury, indicating an additional role in vascular wall integrity [PMID:bio_10.1101_2024.08.06.24311443]. Beyond these activities, the molecular details of how FCGBP traffics or organizes IgG within mucus have not been further characterized in the available corpus.","teleology":[{"year":1991,"claim":"Before FCGBP was molecularly defined, an early question was whether a discrete human protein could bind IgG Fc independently of classical Fc receptors; an interferon-inducible intracellular IgG-binding phosphoprotein was characterized, though it is likely distinct from the large secretory FCGBP later cloned.","evidence":"Immunoprecipitation from radiolabeled cells, surface binding and phosphorylation analysis in human cells","pmids":["1825221"],"confidence":"Low","gaps":["The ~45–50 kDa intracellular IFN-induced protein may not be the canonical secretory FCGBP locus","No sequence or gene assignment linking it to the cloned FCGBP"]},{"year":1997,"claim":"The question of which region of FCGBP mediates IgG binding and how the protein is organized was resolved by cloning, mapping the IgG Fc binding activity to the N-terminal 450 residues and revealing a repetitive mucin-like cysteine-rich architecture.","evidence":"cDNA cloning, sequence analysis, and domain deletion/expression binding assay","pmids":["9182547"],"confidence":"High","gaps":["No structure of the IgG-binding domain","Affinity and stoichiometry of IgG binding not quantified","Functional consequence of the mucin-like repeats untested"]},{"year":1997,"claim":"Whether FCGBP-bound IgG could be detected in circulation as a marker of secretory activity was addressed by detecting elevated serum FCGBP antigen in autoimmune disease patients.","evidence":"ELISA and immunoprecipitation on patient sera","pmids":["11600203"],"confidence":"Low","gaps":["Single immunoassay, no mechanistic dissection","Causal link to autoimmune pathology not established"]},{"year":2002,"claim":"To establish where FCGBP acts and whether secreted FCGBP retains function, its expression across mucosal epithelia and a complement-suppressing activity were demonstrated.","evidence":"Immunohistochemistry, immunoprecipitation, and complement-mediated haemolysis inhibition assay across multiple human tissues","pmids":["12117874"],"confidence":"Medium","gaps":["Mechanism of complement suppression unresolved","Whether IgG binding and complement suppression are coupled untested"]},{"year":2005,"claim":"The question of whether FCGBP is genuinely secreted into the mucosal lumen rather than retained intracellularly was answered by identifying it as an abundant faecal protein.","evidence":"2D gel electrophoresis and MALDI-TOF mass spectrometry of mouse stool","pmids":["16097391"],"confidence":"Medium","gaps":["No functional readout in the luminal compartment","Relationship to mucus structure not examined"]},{"year":2020,"claim":"FCGBP expression was linked to a specific epithelial cell-fate decision, marking metaplastic respiratory cells arising from exhausted olfactory stem cells.","evidence":"In vivo mouse genetic models with lineage tracing and immunofluorescence","pmids":["32385093"],"confidence":"Medium","gaps":["FCGBP used as a fate marker, not functionally dissected","No test of whether FCGBP affects the metaplastic phenotype"]},{"year":2024,"claim":"Whether FCGBP has a role beyond mucosal immunity was addressed by loss-of-function studies implicating it in vascular wall stability and acute pancreatitis severity.","evidence":"Whole-exome sequencing, serum ELISA, Fcgbp-knockdown mice, and FCGBP-knockdown human vascular fibroblasts (preprint)","pmids":["bio_10.1101_2024.08.06.24311443"],"confidence":"Medium","gaps":["Molecular mechanism of vascular stabilization unknown","Not yet peer-reviewed","Connection between vascular role and mucosal/IgG-binding function unclear"]},{"year":null,"claim":"How FCGBP molecularly transports or sequesters IgG within mucus, and how its mucin-like repeats and any covalent linkages organize the mucus barrier, remains unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No structural model of the IgG-binding domain","No defined biochemical mechanism for complement suppression","Mechanism linking FCGBP to vascular integrity uncharacterized"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,1]}],"localization":[{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[1,3]}],"pathway":[{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[1]}],"complexes":[],"partners":["IGG"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9Y6R7","full_name":"IgGFc-binding protein","aliases":["Fcgamma-binding protein antigen","FcgammaBP"],"length_aa":5405,"mass_kda":572.0,"function":"May be involved in the maintenance of the mucosal structure as a gel-like component of the mucosa","subcellular_location":"Secreted","url":"https://www.uniprot.org/uniprotkb/Q9Y6R7/entry"},"depmap":{"release":"DepMap","has_data":false,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/FCGBP"},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/FCGBP","total_profiled":1310},"omim":[{"mim_id":"617553","title":"Fc FRAGMENT OF IgG-BINDING PROTEIN; FCGBP","url":"https://www.omim.org/entry/617553"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Plasma membrane","reliability":"Approved"},{"location":"Golgi apparatus","reliability":"Additional"},{"location":"Cytokinetic bridge","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"intestine","ntpm":192.6},{"tissue":"salivary gland","ntpm":87.6},{"tissue":"thyroid gland","ntpm":93.6}],"url":"https://www.proteinatlas.org/search/FCGBP"},"hgnc":{"alias_symbol":["FC(GAMMA)BP","FcgammaBP"],"prev_symbol":[]},"alphafold":{"accession":"Q9Y6R7","domains":[],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9Y6R7","model_url":"","pae_url":"","plddt_mean":null},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=FCGBP","jax_strain_url":"https://www.jax.org/strain/search?query=FCGBP"},"sequence":{"accession":"Q9Y6R7","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9Y6R7.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9Y6R7/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9Y6R7"}},"corpus_meta":[{"pmid":"2141627","id":"PMC_2141627","title":"Molecular basis for a polymorphism of human Fc gamma receptor II (CD32).","date":"1990","source":"The Journal of experimental 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activator protein-1 and the Ets motifs in the distal and the proximal promoter regions.","date":"2003","source":"Immunology","url":"https://pubmed.ncbi.nlm.nih.gov/12871225","citation_count":9,"is_preprint":false},{"pmid":"11112392","id":"PMC_11112392","title":"GATA and NF-Y participate in transcriptional regulation of FcgammaRIIA in megakaryocytic cells.","date":"2000","source":"Blood cells, molecules & diseases","url":"https://pubmed.ncbi.nlm.nih.gov/11112392","citation_count":8,"is_preprint":false},{"pmid":"7544888","id":"PMC_7544888","title":"A novel IL-4 responsive element of the E alpha MHC class II promoter that binds to an inducible factor.","date":"1995","source":"Nucleic acids research","url":"https://pubmed.ncbi.nlm.nih.gov/7544888","citation_count":8,"is_preprint":false},{"pmid":"1825221","id":"PMC_1825221","title":"An intracellular 50-kDa Fc gamma-binding protein is induced in human cells by alpha-IFN.","date":"1991","source":"Journal of immunology (Baltimore, Md. : 1950)","url":"https://pubmed.ncbi.nlm.nih.gov/1825221","citation_count":6,"is_preprint":false},{"pmid":"21067817","id":"PMC_21067817","title":"Cloning and characterization of ovine immunoglobulin G Fc receptor III (FcγRIII).","date":"2010","source":"Veterinary immunology and immunopathology","url":"https://pubmed.ncbi.nlm.nih.gov/21067817","citation_count":2,"is_preprint":false},{"pmid":"11884455","id":"PMC_11884455","title":"The Pmed1 gene promoter of human Fc gamma RIIIA can function as a NK/T cell-specific restriction element, which involves binding of Sp1 transcription factor.","date":"2002","source":"Journal of immunology (Baltimore, Md. : 1950)","url":"https://pubmed.ncbi.nlm.nih.gov/11884455","citation_count":2,"is_preprint":false},{"pmid":"39229044","id":"PMC_39229044","title":"Abnormal activation of the mineralocorticoid receptor in the aldosterone-sensitive distal nephron contributes to fructose-induced salt-sensitive hypertension.","date":"2024","source":"bioRxiv : the preprint server for biology","url":"https://pubmed.ncbi.nlm.nih.gov/39229044","citation_count":2,"is_preprint":false},{"pmid":"40653069","id":"PMC_40653069","title":"Agricultural copper pesticide exposure and DNA methylation in Central Valley of California residents with and without Parkinson's disease.","date":"2025","source":"Environmental research","url":"https://pubmed.ncbi.nlm.nih.gov/40653069","citation_count":1,"is_preprint":false},{"pmid":"1700711","id":"PMC_1700711","title":"Structural differences among guinea pig Fc gamma 1/gamma 2 receptors on macrophages, polymorphonuclear cells, and lymphocytes.","date":"1990","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/1700711","citation_count":1,"is_preprint":false},{"pmid":"12903392","id":"PMC_12903392","title":"[Construction of BPI23-Fc gamma 1 recombinant protein prokaryotic expression vector and the expression and biological assessment of BPI23-Fc gamma 1 recombinant protein].","date":"2000","source":"Zhongguo yi xue ke xue yuan xue bao. Acta Academiae Medicinae Sinicae","url":"https://pubmed.ncbi.nlm.nih.gov/12903392","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2025.04.17.25325767","title":"Combining Mass Spectrometry with Machine Learning to Identify Novel Protein Signatures: The Example of Multisystem Inflammatory Syndrome in Children","date":"2025-04-21","source":"bioRxiv","url":"https://doi.org/10.1101/2025.04.17.25325767","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2024.08.06.24311443","title":"Whole Exome Sequencing Reveals<i>FCGBP</i>Variant Associated with Spontaneous Intraabdominal Hemorrhage in Severe Acute Pancreatitis","date":"2024-08-07","source":"bioRxiv","url":"https://doi.org/10.1101/2024.08.06.24311443","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":35065,"output_tokens":2033,"usd":0.067845,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":8970,"output_tokens":2347,"usd":0.051763,"stage2_stop_reason":"end_turn"},"total_usd":0.119608,"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\": 1997,\n      \"finding\": \"The N-terminal 450-amino acid sequence of FCGBP is necessary and sufficient to confer IgG Fc binding activity, and the protein contains 12 occurrences of a 400-amino acid cysteine-rich unit resembling mucin, with a conserved CGLCGN motif shared with MUC2 and prepro-von Willebrand factor.\",\n      \"method\": \"cDNA cloning, sequence analysis, domain deletion/expression assay for IgG Fc binding activity\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct in vitro binding assay with defined N-terminal domain mapped as necessary and sufficient; single lab but multiple orthogonal methods (cloning, sequencing, functional binding assay)\",\n      \"pmids\": [\"9182547\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"FCGBP is expressed in mucin-secreting cells of the colon, small intestine, gall bladder, biliary tract, bronchus, submandibular gland, and cervix uteri (but not conjunctival mucin cells), is present in their secreted fluids with retained IgG-binding activity, and suppresses complement-mediated haemolysis of sheep red blood cells in vitro.\",\n      \"method\": \"Immunohistochemistry, immunodotblot, immunoprecipitation with monoclonal antibodies, complement-mediated haemolysis inhibition assay\",\n      \"journal\": \"Gut\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (IHC, immunoprecipitation, functional haemolysis assay) in a single lab study establishing both localization and a functional activity\",\n      \"pmids\": [\"12117874\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"FCGBP antigen is detectable at elevated levels in serum of patients with autoimmune diseases (particularly progressive systemic sclerosis), establishing that FCGBP is secreted into circulation from goblet cells.\",\n      \"method\": \"ELISA, immunoprecipitation with anti-FCGBP monoclonal antibodies on patient sera\",\n      \"journal\": \"Immunology letters\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, single immunoassay method; no mechanistic dissection beyond detection\",\n      \"pmids\": [\"11600203\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"FCGBP protein was identified among the most abundant proteins in murine faeces, confirming its secretion from intestinal goblet cells into the gut lumen.\",\n      \"method\": \"Two-dimensional gel electrophoresis and MALDI-TOF mass spectrometry of mouse stool proteins\",\n      \"journal\": \"Biomarkers\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — direct protein identification by mass spectrometry in a defined compartment (gut lumen/faeces), single study\",\n      \"pmids\": [\"16097391\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"In the aging olfactory epithelium, exhausted horizontal basal stem cells differentiate into metaplastic respiratory cells that secrete FCGBP (a mucin-like mucus barrier protein), linking FCGBP expression to a specific cell-lineage commitment event driven by altered retinoic acid metabolism.\",\n      \"method\": \"In vivo mouse genetic model (CYP26B1 overexpression, repeated injury, aging), live imaging, immunofluorescence, lineage tracing\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — defined cellular phenotype with loss-of-function/gain-of-function genetic models; FCGBP used as a marker of the metaplastic cell fate rather than being functionally dissected itself; single lab\",\n      \"pmids\": [\"32385093\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"FCGBP is expressed by mucous bronchial gland cells and some airway goblet cells, and is proposed (with prior experimental support cited from earlier work) to transport serum IgG onto mucosal surfaces, trap IgG-bound virus, and suppress complement fixation by competing with macrophage Fc binding.\",\n      \"method\": \"Immunohistochemistry (immunoreactivity for FCGBP in airway cells); review integrating prior experimental findings\",\n      \"journal\": \"Innate immunity\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — new localization data (IHC in airway tissue) from a single lab; functional claims are largely reiterated from prior work rather than newly demonstrated\",\n      \"pmids\": [\"34521229\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"A variant in FCGBP (rs1326680184) reduces serum FCGBP levels; Fcgbp-knockdown mice showed more severe acute pancreatitis morphology and higher risk of hemorrhage; FCGBP-knockdown human vascular fibroblasts demonstrated destabilized vascular walls and increased vascular injury, indicating FCGBP contributes to vascular wall stability.\",\n      \"method\": \"Whole-exome sequencing, serum ELISA, in vivo Fcgbp-knockdown mouse model, in vitro FCGBP-knockdown human vascular fibroblasts\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function in both in vivo (mouse KD) and in vitro (human cell KD) models with defined phenotypic readouts; preprint, not yet peer-reviewed\",\n      \"pmids\": [\"bio_10.1101_2024.08.06.24311443\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"An intracellular ~45–50 kDa IgG Fc-binding protein (designated Fc gamma BP in that study) is induced by alpha-interferon in human cells; it binds human IgG but not IgM, IgA, or IgE; it is a phosphoprotein whose phosphorylation increases after alpha-IFN treatment; and it is not detectable on the cell surface.\",\n      \"method\": \"Immunoprecipitation from [35S]methionine-labeled cells, cell-surface binding assays, phosphorylation analysis\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, single immunoprecipitation method; the described 45–50 kDa intracellular protein induced by IFN-α is distinct from the large secretory FCGBP (16 kb mRNA) cloned in 1997; may represent a different protein sharing the 'FcgammaBP' name; low confidence for assignment to canonical FCGBP locus\",\n      \"pmids\": [\"1825221\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"FCGBP is a very large (~16 kb mRNA), mucin-like secretory protein expressed by goblet and other mucin-producing epithelial cells at mucosal surfaces; its N-terminal 450 amino acids are necessary and sufficient for IgG Fc binding, it is secreted into mucus and several body fluids where it retains IgG-binding activity and can suppress complement-mediated haemolysis, and in vascular contexts loss of FCGBP destabilizes the vascular wall, suggesting an additional role in maintaining vascular integrity.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"FCGBP is a very large mucin-like protein secreted by goblet and other mucin-producing epithelial cells at mucosal surfaces, where it functions in mucosal immune defense [#0, #1]. Its N-terminal 450 amino acids are necessary and sufficient to confer IgG Fc binding activity, and the protein is built from repeated ~400-amino acid cysteine-rich units containing a CGLCGN motif shared with the mucins MUC2 and von Willebrand factor [#0]. FCGBP is expressed in mucin-secreting cells across the colon, small intestine, gall bladder, biliary tract, bronchus, submandibular gland, and cervix, is released into their secreted fluids and the gut lumen with retained IgG-binding activity, and suppresses complement-mediated haemolysis in vitro [#1, #3]. Loss-of-function in human vascular fibroblasts and Fcgbp-knockdown mice destabilizes the vascular wall and increases vascular injury, indicating an additional role in vascular wall integrity [#6]. Beyond these activities, the molecular details of how FCGBP traffics or organizes IgG within mucus have not been further characterized in the available corpus.\",\n  \"teleology\": [\n    {\n      \"year\": 1991,\n      \"claim\": \"Before FCGBP was molecularly defined, an early question was whether a discrete human protein could bind IgG Fc independently of classical Fc receptors; an interferon-inducible intracellular IgG-binding phosphoprotein was characterized, though it is likely distinct from the large secretory FCGBP later cloned.\",\n      \"evidence\": \"Immunoprecipitation from radiolabeled cells, surface binding and phosphorylation analysis in human cells\",\n      \"pmids\": [\"1825221\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"The ~45\\u201350 kDa intracellular IFN-induced protein may not be the canonical secretory FCGBP locus\", \"No sequence or gene assignment linking it to the cloned FCGBP\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"The question of which region of FCGBP mediates IgG binding and how the protein is organized was resolved by cloning, mapping the IgG Fc binding activity to the N-terminal 450 residues and revealing a repetitive mucin-like cysteine-rich architecture.\",\n      \"evidence\": \"cDNA cloning, sequence analysis, and domain deletion/expression binding assay\",\n      \"pmids\": [\"9182547\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structure of the IgG-binding domain\", \"Affinity and stoichiometry of IgG binding not quantified\", \"Functional consequence of the mucin-like repeats untested\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Whether FCGBP-bound IgG could be detected in circulation as a marker of secretory activity was addressed by detecting elevated serum FCGBP antigen in autoimmune disease patients.\",\n      \"evidence\": \"ELISA and immunoprecipitation on patient sera\",\n      \"pmids\": [\"11600203\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Single immunoassay, no mechanistic dissection\", \"Causal link to autoimmune pathology not established\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"To establish where FCGBP acts and whether secreted FCGBP retains function, its expression across mucosal epithelia and a complement-suppressing activity were demonstrated.\",\n      \"evidence\": \"Immunohistochemistry, immunoprecipitation, and complement-mediated haemolysis inhibition assay across multiple human tissues\",\n      \"pmids\": [\"12117874\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of complement suppression unresolved\", \"Whether IgG binding and complement suppression are coupled untested\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"The question of whether FCGBP is genuinely secreted into the mucosal lumen rather than retained intracellularly was answered by identifying it as an abundant faecal protein.\",\n      \"evidence\": \"2D gel electrophoresis and MALDI-TOF mass spectrometry of mouse stool\",\n      \"pmids\": [\"16097391\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No functional readout in the luminal compartment\", \"Relationship to mucus structure not examined\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"FCGBP expression was linked to a specific epithelial cell-fate decision, marking metaplastic respiratory cells arising from exhausted olfactory stem cells.\",\n      \"evidence\": \"In vivo mouse genetic models with lineage tracing and immunofluorescence\",\n      \"pmids\": [\"32385093\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"FCGBP used as a fate marker, not functionally dissected\", \"No test of whether FCGBP affects the metaplastic phenotype\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Whether FCGBP has a role beyond mucosal immunity was addressed by loss-of-function studies implicating it in vascular wall stability and acute pancreatitis severity.\",\n      \"evidence\": \"Whole-exome sequencing, serum ELISA, Fcgbp-knockdown mice, and FCGBP-knockdown human vascular fibroblasts (preprint)\",\n      \"pmids\": [\"bio_10.1101_2024.08.06.24311443\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular mechanism of vascular stabilization unknown\", \"Not yet peer-reviewed\", \"Connection between vascular role and mucosal/IgG-binding function unclear\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How FCGBP molecularly transports or sequesters IgG within mucus, and how its mucin-like repeats and any covalent linkages organize the mucus barrier, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No structural model of the IgG-binding domain\", \"No defined biochemical mechanism for complement suppression\", \"Mechanism linking FCGBP to vascular integrity uncharacterized\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [1, 3]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"IGG\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":3,"faith_total":3,"faith_pct":100.0}}