{"gene":"FCN2","run_date":"2026-04-28T17:46:03","timeline":{"discoveries":[{"year":2005,"finding":"FCN2-encoded Ficolin-2 (L-ficolin) serum concentration is regulated by polymorphisms in both the promoter region and the structural (fibrinogen-like domain) of the FCN2 gene; two non-synonymous polymorphisms in exon 8 alter GlcNAc binding, with one increasing and one decreasing binding capacity, demonstrating that FCN2 variants directly modulate both expression and carbohydrate-recognition function of the protein.","method":"DNA sequencing, ELISA for serum concentration, GlcNAc binding and recovery assays","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 1–2 — multiple orthogonal methods (sequencing, serum ELISA, functional binding assay) in a single study with clear genotype-phenotype links","pmids":["15879437"],"is_preprint":false},{"year":2006,"finding":"Recombinant human Ficolin-2 forms a 12-mer (major functional form, ~403 kDa) and an unstable 24-mer (~807 kDa) via extensive disulfide bridge formation in its N-terminal region; the 12-mer binds GlcNAc-containing ligands, interacts with MASP (mannose-binding lectin associated serine proteases), and activates the complement system through the lectin pathway.","method":"Gel filtration, sucrose density gradient ultracentrifugation, mass spectrometry, surface plasmon resonance, complement activation assays using recombinant protein expressed in CHO cells","journal":"Molecular immunology","confidence":"High","confidence_rationale":"Tier 1 — reconstituted recombinant protein characterized by multiple orthogonal biophysical and functional methods","pmids":["16595153"],"is_preprint":false},{"year":2007,"finding":"Inter-individual variation in serum Ficolin-2 concentration is associated with three promoter polymorphisms and one structural polymorphism in FCN2; gel-permeation chromatography and Western blot showed Ficolin-2 circulates as a mixture of covalently and non-covalently linked oligomers independent of genotype.","method":"Sandwich ELISA, TaqMan-based SNP genotyping, sequencing, gel-permeation chromatography, SDS-PAGE, Western blot","journal":"Scandinavian journal of immunology","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods confirming genotype-concentration and oligomeric structure relationships","pmids":["17386030"],"is_preprint":false},{"year":2000,"finding":"Ficolin/P35 (Ficolin-2) functions as an opsonin by binding to N-acetylglucosamine (GlcNAc) residues exposed on the surface of bacteria (e.g., Ra chemotype Salmonella typhimurium), enhancing phagocytic uptake by monocytes and polymorphonuclear leukocytes; binding requires surface-accessible GlcNAc and is absent on smooth strains with covering O-polysaccharides.","method":"Binding assay with bacterial strains, monocyte/PMN phagocytosis assay, ELISA with monoclonal antibodies","journal":"Fukushima journal of medical science","confidence":"Medium","confidence_rationale":"Tier 2 — direct functional (opsonophagocytosis) assay with clear ligand-specificity controls, single lab","pmids":["11446374"],"is_preprint":false},{"year":2013,"finding":"Ficolin-2 binds to surface glycolipids of virulent Mycobacterium tuberculosis H37Rv (but not non-virulent strains), blocks H37Rv infection of lung A549 cells, promotes opsonophagocytosis, and defends against Mtb infection in vivo in mice at least partially by activating JNK phosphorylation and stimulating IFN-γ, IL-17, IL-6, TNF-α, and nitric oxide production in macrophages.","method":"In vitro binding assay, cell infection assay, opsonophagocytosis assay, mouse challenge model (C57BL/6J and BALB/c), ficolin-A knockout mice, cytokine/NO measurement","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal in vitro and in vivo methods with loss-of-function (KO) and gain-of-function (exogenous ficolin-2 administration) arms","pmids":["24040095"],"is_preprint":false},{"year":2012,"finding":"Human L-ficolin (Ficolin-2/P35) is synthesized in the liver, secreted into blood as a major serum pattern recognition molecule, forms higher multimers (typically a 12-mer, ~400 kDa) via a collagen-like triple helix, and possesses a complex set of binding sites within an internal cleft enabling recognition of acetylated sugars and 1,3-β-glucans to activate the lectin complement pathway.","method":"Review synthesizing structural and biochemical data including protein characterization studies","journal":"Journal of biomedicine & biotechnology","confidence":"Medium","confidence_rationale":"Tier 3 — review synthesizing published experimental data; included for mechanistic synthesis","pmids":["22500076"],"is_preprint":false},{"year":2009,"finding":"MBL2, FCN1, FCN2, and FCN3 genes encode soluble collagen-like pattern recognition molecules (MBL, Ficolin-1, Ficolin-2, Ficolin-3) that bind sugar structures or acetylated compounds on microorganisms and dying host cells to initiate lectin complement pathway activation; FCN2 harbors polymorphic sites affecting serum concentration, stability, and carbohydrate-binding capacity of Ficolin-2.","method":"Molecular genetic and functional review of published experimental data","journal":"Molecular immunology","confidence":"Medium","confidence_rationale":"Tier 3 — mechanistic synthesis review; included because it consolidates experimental evidence from multiple labs","pmids":["19501910"],"is_preprint":false},{"year":1995,"finding":"EBP-37, a human plasma protein with collagenous and non-collagenous domains highly similar to ficolins (including the FCN2 gene product), directly binds elastin; it exists as oligomers and multimers cross-linked by disulfide bonds.","method":"Elastin-Sepharose affinity chromatography, N-terminal amino acid sequencing, immunoblot, nitrocellulose binding assay","journal":"Journal of biochemistry","confidence":"Low","confidence_rationale":"Tier 3 — single lab, partial characterization; EBP-37 described as similar but not identical to ficolins","pmids":["8586615"],"is_preprint":false},{"year":2013,"finding":"Ficolin-2 binding and complement activation via the lectin pathway (measured as C4 and C3 deposition on acetylated ligand) is impaired when serum is prepared using silica clot activator tubes, indicating that sample handling affects Ficolin-2 functional activity; no terminal complement complex (TCC) formation was detected under tested assay conditions.","method":"ELISA (multiple formats), complement activation assays (C4, C3 deposition), comparison of serum and plasma from different collection tubes","journal":"Molecular immunology","confidence":"Medium","confidence_rationale":"Tier 2 — direct functional assays with orthogonal measurement approaches revealing mechanism of activity impairment","pmids":["23911396"],"is_preprint":false}],"current_model":"FCN2-encoded Ficolin-2 (L-ficolin) is a liver-synthesized, oligomeric serum pattern recognition molecule (predominantly a 12-mer stabilized by N-terminal disulfide bridges) that binds acetylated sugars (especially GlcNAc) and 1,3-β-glucans on microbial surfaces via fibrinogen-like recognition domains, functions as an opsonin to enhance phagocytosis, activates the lectin complement pathway by recruiting MASPs, and whose expression level and carbohydrate-binding capacity are directly regulated by functional polymorphisms in the FCN2 promoter and fibrinogen-like domain."},"narrative":{"teleology":[{"year":1995,"claim":"Early biochemical work identified a plasma protein (EBP-37) with ficolin-like collagenous and non-collagenous domains that binds elastin and forms disulfide-linked oligomers, establishing the first physical characterization of ficolin family members in human serum.","evidence":"Elastin-Sepharose affinity chromatography, N-terminal sequencing, and immunoblot of human plasma","pmids":["8586615"],"confidence":"Low","gaps":["EBP-37 was described as similar but not confirmed identical to the FCN2 gene product","No carbohydrate-binding or complement activation was tested","Single lab, partial characterization"]},{"year":2000,"claim":"Demonstration that Ficolin-2 functions as an opsonin by binding bacterial surface GlcNAc residues and enhancing phagocytic uptake answered whether ficolins have a direct antimicrobial effector role beyond pattern recognition.","evidence":"Binding assays with Salmonella typhimurium strains differing in surface sugar accessibility, followed by monocyte/PMN phagocytosis assays","pmids":["11446374"],"confidence":"Medium","gaps":["Opsonophagocytosis shown for a single bacterial species","Complement activation downstream of binding was not measured in this study","Single lab findings"]},{"year":2005,"claim":"Genetic dissection of FCN2 revealed that promoter and exon 8 polymorphisms directly regulate serum concentration and GlcNAc-binding capacity, establishing for the first time that natural human FCN2 variation modulates both expression and ligand-recognition function.","evidence":"DNA sequencing, serum ELISA, and GlcNAc binding/recovery assays in a genotyped human cohort","pmids":["15879437"],"confidence":"High","gaps":["Downstream effects of altered binding on complement activation in vivo were not tested","No disease association was established in this study"]},{"year":2006,"claim":"Reconstitution of recombinant Ficolin-2 defined the 12-mer as the major functional oligomer, showed it binds GlcNAc ligands and interacts with MASPs to activate the lectin complement pathway, resolving the quaternary structure–function relationship.","evidence":"Gel filtration, sucrose density gradient ultracentrifugation, mass spectrometry, surface plasmon resonance, and complement activation assays using recombinant Ficolin-2 from CHO cells","pmids":["16595153"],"confidence":"High","gaps":["Crystal structure of the full 12-mer was not solved","Relative contributions of different MASP isoforms to Ficolin-2-dependent complement activation were not delineated"]},{"year":2007,"claim":"Confirmation that Ficolin-2 circulates as a mixture of covalently and non-covalently linked oligomers independent of genotype, alongside replication of promoter SNP effects on serum levels, consolidated the genotype–phenotype framework.","evidence":"Gel-permeation chromatography, SDS-PAGE, Western blot, and TaqMan SNP genotyping in a second cohort","pmids":["17386030"],"confidence":"High","gaps":["Functional consequences of non-covalent vs. covalent oligomeric forms for MASP recruitment were not determined"]},{"year":2013,"claim":"In vivo mouse challenge experiments using ficolin-A knockout animals and exogenous Ficolin-2 demonstrated that Ficolin-2 binds virulent M. tuberculosis glycolipids, blocks epithelial infection, and activates macrophage JNK/cytokine signaling, extending the effector role beyond opsonization to direct host defense signaling.","evidence":"In vitro binding and infection assays, opsonophagocytosis, C57BL/6J and BALB/c mouse Mtb challenge, ficolin-A KO mice, cytokine and NO measurement","pmids":["24040095"],"confidence":"High","gaps":["The mouse ortholog ficolin-A is not identical to human Ficolin-2; species-specific differences may limit translational inference","Whether JNK activation is direct or secondary to complement deposition was not resolved"]},{"year":2013,"claim":"Identification that silica clot activator tubes impair Ficolin-2 binding and lectin-pathway complement activation highlighted that pre-analytical variables affect functional assays, explaining discrepancies across studies.","evidence":"ELISA and complement deposition assays (C4, C3) comparing serum and plasma from different collection tubes","pmids":["23911396"],"confidence":"Medium","gaps":["Mechanism by which silica specifically inactivates Ficolin-2 was not elucidated","Terminal complement complex formation was not detected under the conditions tested"]},{"year":null,"claim":"Key unresolved questions include the high-resolution structural basis of Ficolin-2's dual acetylated-sugar and β-glucan recognition, the precise stoichiometry and selectivity of MASP isoform recruitment by the 12-mer, and the in vivo contribution of Ficolin-2-dependent JNK signaling versus complement activation to anti-mycobacterial defense.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No full-length crystal or cryo-EM structure of the Ficolin-2 oligomer","Relative importance of complement-dependent vs. complement-independent effector functions not dissected in human systems","Causal link between FCN2 polymorphisms and susceptibility to specific infectious diseases not established by Mendelian genetics"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[1,3,4,5]},{"term_id":"GO:0140299","term_label":"molecular sensor activity","supporting_discovery_ids":[0,3,4]}],"localization":[{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[1,2,5]}],"pathway":[{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[1,3,4,5,6]}],"complexes":[],"partners":["MASP1","MASP2"],"other_free_text":[]},"mechanistic_narrative":"FCN2 encodes Ficolin-2 (L-ficolin), a liver-synthesized, oligomeric serum pattern recognition molecule that activates the lectin complement pathway and functions as an opsonin in innate immunity. The predominant circulating form is a disulfide-stabilized 12-mer (~400 kDa) assembled via a collagen-like triple helix; its fibrinogen-like recognition domains bind acetylated sugars (particularly GlcNAc) and 1,3-β-glucans on microbial surfaces, recruiting MASPs to initiate complement activation and promoting phagocytic uptake by monocytes and neutrophils [PMID:16595153, PMID:11446374]. Ficolin-2 binds surface glycolipids of virulent Mycobacterium tuberculosis, blocks epithelial cell infection, and stimulates macrophage pro-inflammatory cytokine and nitric oxide production via JNK signaling in vivo [PMID:24040095]. Functional polymorphisms in the FCN2 promoter and fibrinogen-like domain directly modulate serum Ficolin-2 concentration and GlcNAc-binding capacity [PMID:15879437, PMID:17386030]."},"prefetch_data":{"uniprot":{"accession":"Q15485","full_name":"Ficolin-2","aliases":["37 kDa elastin-binding protein","EBP-37","Collagen/fibrinogen domain-containing protein 2","Ficolin-B","Ficolin-beta","Hucolin","L-ficolin","Serum lectin p35"],"length_aa":313,"mass_kda":34.0,"function":"Calcium-dependent lectin, which acts as a pattern recognition receptor that initiates the lectin pathway of the complement system, a cascade of proteins that leads to phagocytosis and breakdown of pathogens and signaling that strengthens the adaptive immune system (PubMed:10679061, PubMed:14707097, PubMed:15804047, PubMed:17215869, PubMed:25344472, PubMed:8576206). Specifically recognizes and binds carbohydrates on the pathogen surface, activating the MASP1 serine protease and initiating the proteolytic cascade of the lectin complement pathway (PubMed:14707097). Specifically binds N-Acetylglucosamine (GlcNAc), as well as phosphocholine and lipoteichoic acid moieties on the surface of pathogens (PubMed:14707097, PubMed:17215869, PubMed:25344472, PubMed:8576206). Enhances phagocytosis of S.typhimurium by neutrophils, suggesting an opsonic effect (PubMed:8576206)","subcellular_location":"Secreted; Cell surface","url":"https://www.uniprot.org/uniprotkb/Q15485/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/FCN2","classification":"Not Classified","n_dependent_lines":3,"n_total_lines":1208,"dependency_fraction":0.0024834437086092716},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/FCN2","total_profiled":1310},"omim":[{"mim_id":"613860","title":"FICOLIN 3 DEFICIENCY","url":"https://www.omim.org/entry/613860"},{"mim_id":"613357","title":"FIBRINOGEN C DOMAIN-CONTAINING PROTEIN 1; FIBCD1","url":"https://www.omim.org/entry/613357"},{"mim_id":"605102","title":"MANNAN-BINDING LECTIN SERINE PROTEASE 2; MASP2","url":"https://www.omim.org/entry/605102"},{"mim_id":"604973","title":"FICOLIN 3; FCN3","url":"https://www.omim.org/entry/604973"},{"mim_id":"601624","title":"FICOLIN 2; FCN2","url":"https://www.omim.org/entry/601624"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Group enriched","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"adrenal gland","ntpm":24.2},{"tissue":"liver","ntpm":93.1}],"url":"https://www.proteinatlas.org/search/FCN2"},"hgnc":{"alias_symbol":["P35","FCNL","EBP-37","ficolin-2"],"prev_symbol":[]},"alphafold":{"accession":"Q15485","domains":[{"cath_id":"3.90.215.10","chopping":"97-247_305-313","consensus_level":"high","plddt":97.8296,"start":97,"end":313}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q15485","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q15485-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q15485-F1-predicted_aligned_error_v6.png","plddt_mean":85.12},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=FCN2","jax_strain_url":"https://www.jax.org/strain/search?query=FCN2"},"sequence":{"accession":"Q15485","fasta_url":"https://rest.uniprot.org/uniprotkb/Q15485.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q15485/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q15485"}},"corpus_meta":[{"pmid":"10604467","id":"PMC_10604467","title":"Conversion 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expression in human monocytes: selective priming by interferon-gamma of lipopolysaccharide-inducible p35 and p40 genes.","date":"1995","source":"Blood","url":"https://pubmed.ncbi.nlm.nih.gov/7605994","citation_count":308,"is_preprint":false},{"pmid":"11517264","id":"PMC_11517264","title":"p35 and p39 are essential for cyclin-dependent kinase 5 function during neurodevelopment.","date":"2001","source":"The Journal of neuroscience : the official journal of the Society for Neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/11517264","citation_count":306,"is_preprint":false},{"pmid":"11331872","id":"PMC_11331872","title":"ERK induces p35, a neuron-specific activator of Cdk5, through induction of Egr1.","date":"2001","source":"Nature cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/11331872","citation_count":273,"is_preprint":false},{"pmid":"7542648","id":"PMC_7542648","title":"The baculovirus p35 protein inhibits Fas- and tumor necrosis factor-induced 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two non-synonymous polymorphisms in exon 8 alter GlcNAc binding, with one increasing and one decreasing binding capacity, demonstrating that FCN2 variants directly modulate both expression and carbohydrate-recognition function of the protein.\",\n      \"method\": \"DNA sequencing, ELISA for serum concentration, GlcNAc binding and recovery assays\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — multiple orthogonal methods (sequencing, serum ELISA, functional binding assay) in a single study with clear genotype-phenotype links\",\n      \"pmids\": [\"15879437\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Recombinant human Ficolin-2 forms a 12-mer (major functional form, ~403 kDa) and an unstable 24-mer (~807 kDa) via extensive disulfide bridge formation in its N-terminal region; the 12-mer binds GlcNAc-containing ligands, interacts with MASP (mannose-binding lectin associated serine proteases), and activates the complement system through the lectin pathway.\",\n      \"method\": \"Gel filtration, sucrose density gradient ultracentrifugation, mass spectrometry, surface plasmon resonance, complement activation assays using recombinant protein expressed in CHO cells\",\n      \"journal\": \"Molecular immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstituted recombinant protein characterized by multiple orthogonal biophysical and functional methods\",\n      \"pmids\": [\"16595153\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Inter-individual variation in serum Ficolin-2 concentration is associated with three promoter polymorphisms and one structural polymorphism in FCN2; gel-permeation chromatography and Western blot showed Ficolin-2 circulates as a mixture of covalently and non-covalently linked oligomers independent of genotype.\",\n      \"method\": \"Sandwich ELISA, TaqMan-based SNP genotyping, sequencing, gel-permeation chromatography, SDS-PAGE, Western blot\",\n      \"journal\": \"Scandinavian journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods confirming genotype-concentration and oligomeric structure relationships\",\n      \"pmids\": [\"17386030\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Ficolin/P35 (Ficolin-2) functions as an opsonin by binding to N-acetylglucosamine (GlcNAc) residues exposed on the surface of bacteria (e.g., Ra chemotype Salmonella typhimurium), enhancing phagocytic uptake by monocytes and polymorphonuclear leukocytes; binding requires surface-accessible GlcNAc and is absent on smooth strains with covering O-polysaccharides.\",\n      \"method\": \"Binding assay with bacterial strains, monocyte/PMN phagocytosis assay, ELISA with monoclonal antibodies\",\n      \"journal\": \"Fukushima journal of medical science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct functional (opsonophagocytosis) assay with clear ligand-specificity controls, single lab\",\n      \"pmids\": [\"11446374\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Ficolin-2 binds to surface glycolipids of virulent Mycobacterium tuberculosis H37Rv (but not non-virulent strains), blocks H37Rv infection of lung A549 cells, promotes opsonophagocytosis, and defends against Mtb infection in vivo in mice at least partially by activating JNK phosphorylation and stimulating IFN-γ, IL-17, IL-6, TNF-α, and nitric oxide production in macrophages.\",\n      \"method\": \"In vitro binding assay, cell infection assay, opsonophagocytosis assay, mouse challenge model (C57BL/6J and BALB/c), ficolin-A knockout mice, cytokine/NO measurement\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal in vitro and in vivo methods with loss-of-function (KO) and gain-of-function (exogenous ficolin-2 administration) arms\",\n      \"pmids\": [\"24040095\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Human L-ficolin (Ficolin-2/P35) is synthesized in the liver, secreted into blood as a major serum pattern recognition molecule, forms higher multimers (typically a 12-mer, ~400 kDa) via a collagen-like triple helix, and possesses a complex set of binding sites within an internal cleft enabling recognition of acetylated sugars and 1,3-β-glucans to activate the lectin complement pathway.\",\n      \"method\": \"Review synthesizing structural and biochemical data including protein characterization studies\",\n      \"journal\": \"Journal of biomedicine & biotechnology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — review synthesizing published experimental data; included for mechanistic synthesis\",\n      \"pmids\": [\"22500076\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"MBL2, FCN1, FCN2, and FCN3 genes encode soluble collagen-like pattern recognition molecules (MBL, Ficolin-1, Ficolin-2, Ficolin-3) that bind sugar structures or acetylated compounds on microorganisms and dying host cells to initiate lectin complement pathway activation; FCN2 harbors polymorphic sites affecting serum concentration, stability, and carbohydrate-binding capacity of Ficolin-2.\",\n      \"method\": \"Molecular genetic and functional review of published experimental data\",\n      \"journal\": \"Molecular immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — mechanistic synthesis review; included because it consolidates experimental evidence from multiple labs\",\n      \"pmids\": [\"19501910\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"EBP-37, a human plasma protein with collagenous and non-collagenous domains highly similar to ficolins (including the FCN2 gene product), directly binds elastin; it exists as oligomers and multimers cross-linked by disulfide bonds.\",\n      \"method\": \"Elastin-Sepharose affinity chromatography, N-terminal amino acid sequencing, immunoblot, nitrocellulose binding assay\",\n      \"journal\": \"Journal of biochemistry\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single lab, partial characterization; EBP-37 described as similar but not identical to ficolins\",\n      \"pmids\": [\"8586615\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Ficolin-2 binding and complement activation via the lectin pathway (measured as C4 and C3 deposition on acetylated ligand) is impaired when serum is prepared using silica clot activator tubes, indicating that sample handling affects Ficolin-2 functional activity; no terminal complement complex (TCC) formation was detected under tested assay conditions.\",\n      \"method\": \"ELISA (multiple formats), complement activation assays (C4, C3 deposition), comparison of serum and plasma from different collection tubes\",\n      \"journal\": \"Molecular immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct functional assays with orthogonal measurement approaches revealing mechanism of activity impairment\",\n      \"pmids\": [\"23911396\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"FCN2-encoded Ficolin-2 (L-ficolin) is a liver-synthesized, oligomeric serum pattern recognition molecule (predominantly a 12-mer stabilized by N-terminal disulfide bridges) that binds acetylated sugars (especially GlcNAc) and 1,3-β-glucans on microbial surfaces via fibrinogen-like recognition domains, functions as an opsonin to enhance phagocytosis, activates the lectin complement pathway by recruiting MASPs, and whose expression level and carbohydrate-binding capacity are directly regulated by functional polymorphisms in the FCN2 promoter and fibrinogen-like domain.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"FCN2 encodes Ficolin-2 (L-ficolin), a liver-synthesized, oligomeric serum pattern recognition molecule that activates the lectin complement pathway and functions as an opsonin in innate immunity. The predominant circulating form is a disulfide-stabilized 12-mer (~400 kDa) assembled via a collagen-like triple helix; its fibrinogen-like recognition domains bind acetylated sugars (particularly GlcNAc) and 1,3-β-glucans on microbial surfaces, recruiting MASPs to initiate complement activation and promoting phagocytic uptake by monocytes and neutrophils [PMID:16595153, PMID:11446374]. Ficolin-2 binds surface glycolipids of virulent Mycobacterium tuberculosis, blocks epithelial cell infection, and stimulates macrophage pro-inflammatory cytokine and nitric oxide production via JNK signaling in vivo [PMID:24040095]. Functional polymorphisms in the FCN2 promoter and fibrinogen-like domain directly modulate serum Ficolin-2 concentration and GlcNAc-binding capacity [PMID:15879437, PMID:17386030].\",\n  \"teleology\": [\n    {\n      \"year\": 1995,\n      \"claim\": \"Early biochemical work identified a plasma protein (EBP-37) with ficolin-like collagenous and non-collagenous domains that binds elastin and forms disulfide-linked oligomers, establishing the first physical characterization of ficolin family members in human serum.\",\n      \"evidence\": \"Elastin-Sepharose affinity chromatography, N-terminal sequencing, and immunoblot of human plasma\",\n      \"pmids\": [\"8586615\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"EBP-37 was described as similar but not confirmed identical to the FCN2 gene product\",\n        \"No carbohydrate-binding or complement activation was tested\",\n        \"Single lab, partial characterization\"\n      ]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Demonstration that Ficolin-2 functions as an opsonin by binding bacterial surface GlcNAc residues and enhancing phagocytic uptake answered whether ficolins have a direct antimicrobial effector role beyond pattern recognition.\",\n      \"evidence\": \"Binding assays with Salmonella typhimurium strains differing in surface sugar accessibility, followed by monocyte/PMN phagocytosis assays\",\n      \"pmids\": [\"11446374\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Opsonophagocytosis shown for a single bacterial species\",\n        \"Complement activation downstream of binding was not measured in this study\",\n        \"Single lab findings\"\n      ]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Genetic dissection of FCN2 revealed that promoter and exon 8 polymorphisms directly regulate serum concentration and GlcNAc-binding capacity, establishing for the first time that natural human FCN2 variation modulates both expression and ligand-recognition function.\",\n      \"evidence\": \"DNA sequencing, serum ELISA, and GlcNAc binding/recovery assays in a genotyped human cohort\",\n      \"pmids\": [\"15879437\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Downstream effects of altered binding on complement activation in vivo were not tested\",\n        \"No disease association was established in this study\"\n      ]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Reconstitution of recombinant Ficolin-2 defined the 12-mer as the major functional oligomer, showed it binds GlcNAc ligands and interacts with MASPs to activate the lectin complement pathway, resolving the quaternary structure–function relationship.\",\n      \"evidence\": \"Gel filtration, sucrose density gradient ultracentrifugation, mass spectrometry, surface plasmon resonance, and complement activation assays using recombinant Ficolin-2 from CHO cells\",\n      \"pmids\": [\"16595153\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Crystal structure of the full 12-mer was not solved\",\n        \"Relative contributions of different MASP isoforms to Ficolin-2-dependent complement activation were not delineated\"\n      ]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Confirmation that Ficolin-2 circulates as a mixture of covalently and non-covalently linked oligomers independent of genotype, alongside replication of promoter SNP effects on serum levels, consolidated the genotype–phenotype framework.\",\n      \"evidence\": \"Gel-permeation chromatography, SDS-PAGE, Western blot, and TaqMan SNP genotyping in a second cohort\",\n      \"pmids\": [\"17386030\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Functional consequences of non-covalent vs. covalent oligomeric forms for MASP recruitment were not determined\"\n      ]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"In vivo mouse challenge experiments using ficolin-A knockout animals and exogenous Ficolin-2 demonstrated that Ficolin-2 binds virulent M. tuberculosis glycolipids, blocks epithelial infection, and activates macrophage JNK/cytokine signaling, extending the effector role beyond opsonization to direct host defense signaling.\",\n      \"evidence\": \"In vitro binding and infection assays, opsonophagocytosis, C57BL/6J and BALB/c mouse Mtb challenge, ficolin-A KO mice, cytokine and NO measurement\",\n      \"pmids\": [\"24040095\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"The mouse ortholog ficolin-A is not identical to human Ficolin-2; species-specific differences may limit translational inference\",\n        \"Whether JNK activation is direct or secondary to complement deposition was not resolved\"\n      ]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Identification that silica clot activator tubes impair Ficolin-2 binding and lectin-pathway complement activation highlighted that pre-analytical variables affect functional assays, explaining discrepancies across studies.\",\n      \"evidence\": \"ELISA and complement deposition assays (C4, C3) comparing serum and plasma from different collection tubes\",\n      \"pmids\": [\"23911396\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Mechanism by which silica specifically inactivates Ficolin-2 was not elucidated\",\n        \"Terminal complement complex formation was not detected under the conditions tested\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the high-resolution structural basis of Ficolin-2's dual acetylated-sugar and β-glucan recognition, the precise stoichiometry and selectivity of MASP isoform recruitment by the 12-mer, and the in vivo contribution of Ficolin-2-dependent JNK signaling versus complement activation to anti-mycobacterial defense.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No full-length crystal or cryo-EM structure of the Ficolin-2 oligomer\",\n        \"Relative importance of complement-dependent vs. complement-independent effector functions not dissected in human systems\",\n        \"Causal link between FCN2 polymorphisms and susceptibility to specific infectious diseases not established by Mendelian genetics\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [1, 3, 4, 5]},\n      {\"term_id\": \"GO:0140299\", \"supporting_discovery_ids\": [0, 3, 4]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [1, 2, 5]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [1, 3, 4, 5, 6]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"MASP1\",\n      \"MASP2\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}