{"gene":"CFB","run_date":"2026-06-09T22:57:18","timeline":{"discoveries":[{"year":1998,"finding":"Two rainbow trout complement Factor B molecules (Bf-1 and Bf-2) were isolated and shown to form the alternative pathway C3 convertase in vitro; both were cleaved into Ba- and Bb-like fragments in the presence of purified trout C3, factor D, and Mg2+-EGTA, confirming their serine protease role as the catalytic subunit of the alternative pathway C3 convertase.","method":"In vitro C3 convertase reconstitution with purified components; hemolytic activity assays; protein cleavage analysis","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution of C3 convertase activity with purified components from a defined vertebrate ortholog, single lab with multiple functional readouts","pmids":["9780182"],"is_preprint":false},{"year":1996,"finding":"The Japanese medaka Bf/C2 gene was shown to be a single-copy gene encoding a single ancestral molecule with equal similarity to mammalian factor B and C2, and with identical exon-intron organization to mammalian Bf and C2 genes, demonstrating conservation of genomic structure across vertebrates.","method":"cDNA cloning, Southern blotting, genomic mapping, sequence analysis","journal":"Immunogenetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct genomic and cDNA characterization with structural validation, single lab with multiple methods","pmids":["8824158"],"is_preprint":false},{"year":1991,"finding":"BF allelic variants (F and S) differ in hemolytic activity: BF F allele showed lower hemolytic activity than BF S in heterozygous individuals, despite BF F being present at higher protein concentration; this association of low hemolysis with specific HLA haplotypes (particularly B35) indicates allele-specific functional differences in complement activation capacity.","method":"Agarose overlay hemolytic assay; crossed immunoelectrophoresis for protein quantitation; HLA haplotyping","journal":"Immunogenetics","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — direct functional hemolytic assay with protein quantitation, single lab, single study","pmids":["1916952"],"is_preprint":false},{"year":2007,"finding":"Nurse shark Bf/C2 genes (GcBf/C2-1 and GcBf/C2-2) encode proteins with conserved domain architecture: leader peptide, three CCPs, one VWFA domain, and a serine protease domain with a putative factor D/C1s/MASP cleavage site, establishing that the structural organization enabling CFB cleavage and complement activation is conserved from cartilaginous fish.","method":"cDNA cloning, Southern blotting, structural domain analysis, phylogenetic analysis","journal":"Developmental and comparative immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — structural characterization of ortholog with domain mapping, single lab","pmids":["17482263"],"is_preprint":false},{"year":2010,"finding":"A novel missense mutation in exon 12 of the CFB gene (c.1598A>G, p.Lys533Arg) was identified in a patient with atypical hemolytic uremic syndrome (aHUS), demonstrating that gain-of-function mutations in CFB can cause dysregulation of the alternative complement pathway leading to aHUS.","method":"Clinical genetic sequencing of CFB exons in an aHUS patient; mutation identification","journal":"Pediatric nephrology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — clinical mutation identification without in vitro functional validation of this specific mutation","pmids":["20108004"],"is_preprint":false},{"year":2023,"finding":"A non-synonymous SNP in CFB (rs4151651, G252S) associated with perianal Crohn's disease was shown by in vitro reconstitution to reduce binding of recombinant S252 CFB to C3b, impair CFB cleavage (activation), and reduce complement-driven macrophage phagocytosis and cytokine secretion compared to wild-type G252 CFB; the S252 substitution generates a de novo glycosylation site. Serum from homozygous risk patients showed decreased macrophage phagocytosis.","method":"Site-directed mutagenesis of human CFB plasmid; cell-free C3b binding and cleavage assays; macrophage phagocytosis assay by flow cytometry; serum functional assays","journal":"Gut","confidence":"High","confidence_rationale":"Tier 1 / Moderate — cell-free reconstitution with mutagenesis plus functional phagocytosis assays and patient serum validation, multiple orthogonal methods in a single rigorous study","pmids":["37080587"],"is_preprint":false},{"year":2022,"finding":"CFB deficiency (Cfb knockout) in diabetic mice reduced tubulointerstitial injury and ceramide biosynthesis. In vitro, CFB knockdown in HK-2 cells under high-glucose conditions reduced NF-κB p65 expression, which in turn reduced transcription of ceramide synthase CERS3, thereby decreasing ceramide biosynthesis and alleviating ER stress, oxidative stress, and apoptosis. C3 knockdown abolished CFB-mediated NF-κB signaling activation and ceramide biosynthesis, placing CFB upstream of C3 in this pathway.","method":"Cfb knockout mouse model; siRNA knockdown in HK-2 cells; exogenous ceramide supplementation rescue experiment; fumonisin B1 (CERS inhibitor) rescue in CFB-overexpressing cells; NF-κB signaling analysis; C3 knockdown epistasis","journal":"JCI insight","confidence":"High","confidence_rationale":"Tier 2 / Moderate — genetic knockout + siRNA knockdown + epistasis (C3 KD) + pharmacological rescue, multiple orthogonal methods establishing pathway position","pmids":["36546481"],"is_preprint":false},{"year":1998,"finding":"Zebrafish were shown to possess two independent Bf gene duplications (but no C2 or C4 genes), demonstrating that Bf duplication in teleosts occurred independently from the Bf/C2 duplication event in mammals, and establishing that bony fish rely on expanded Bf genes rather than a separate C2 gene for complement function.","method":"Genomic PAC clone hybridization; cDNA library screening; Southern blotting; phylogenetic analysis","journal":"Scandinavian journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — direct genomic characterization with multiple molecular methods, single lab","pmids":["9874500"],"is_preprint":false},{"year":2004,"finding":"The sea urchin SpBf (Sp152) contains five short consensus repeats (SCRs), proposed as the ancestral state for the Bf/C2 gene family; three alternatively spliced isoforms were identified, one (Sp152Δ4) encoding an in-frame deletion of SCR4 producing a functional four-SCR protein, providing evidence for how SCR number evolved in the Bf/C2 family through exon deletion.","method":"cDNA cloning; RT-PCR alternative splicing analysis; sequence analysis; expression profiling","journal":"Immunogenetics","confidence":"Low","confidence_rationale":"Tier 3 / Weak — cloning and splicing characterization without functional reconstitution of the variant proteins","pmids":["15448941"],"is_preprint":false}],"current_model":"Complement Factor B (CFB) is a serine protease that serves as the catalytic subunit of the alternative pathway C3 convertase; it binds C3b, is cleaved at a conserved site by factor D into Ba and Bb fragments to form the active convertase, and gain-of-function or loss-of-function mutations in CFB (including the G252S variant that creates a de novo glycosylation site) impair C3b binding, cleavage, and downstream complement-driven phagocytosis, while CFB-mediated complement activation also drives NF-κB signaling and ceramide biosynthesis in renal tubular cells through a C3-dependent pathway."},"narrative":{"mechanistic_narrative":"Complement Factor B (CFB) is the catalytic subunit of the alternative pathway C3 convertase, an evolutionarily ancient component of innate immune complement activation [PMID:9780182]. CFB assembles with C3b and, upon cleavage by factor D into Ba and Bb fragments, forms the active convertase that drives C3-dependent complement amplification [PMID:9780182]. The domain architecture underlying this function — short consensus repeats (SCRs/CCPs), a von Willebrand factor A domain, and a C-terminal serine protease domain bearing the factor D cleavage site — is deeply conserved across vertebrates [PMID:17482263]. Beyond its classical role in opsonization, CFB acts upstream of C3 to activate NF-κB signaling, which induces the ceramide synthase CERS3 and ceramide biosynthesis in renal tubular cells, linking complement activation to ER stress, oxidative stress, and apoptosis in diabetic tubulointerstitial injury [PMID:36546481]. CFB variants alter complement function in human disease: a gain-of-function mutation (p.Lys533Arg) is associated with atypical hemolytic uremic syndrome through dysregulated alternative pathway activation [PMID:20108004], while the G252S substitution generates a de novo glycosylation site that reduces C3b binding, impairs CFB cleavage, and diminishes complement-driven macrophage phagocytosis in perianal Crohn's disease [PMID:37080587].","teleology":[{"year":1991,"claim":"Established that allelic variation in CFB produces functional differences in complement activation, showing the protein's activity is not uniform across the population.","evidence":"Hemolytic overlay assay with protein quantitation and HLA haplotyping of human BF F and S allotypes","pmids":["1916952"],"confidence":"Medium","gaps":["Molecular basis of the F/S activity difference not defined","Single study without structural follow-up"]},{"year":1996,"claim":"Resolved the evolutionary origin of CFB by showing a single ancestral Bf/C2 gene with conserved exon-intron organization predates the mammalian Bf/C2 split.","evidence":"cDNA cloning, genomic mapping, and sequence analysis of the medaka Bf/C2 gene","pmids":["8824158"],"confidence":"Medium","gaps":["Functional convertase activity of the ancestral molecule not tested"]},{"year":1998,"claim":"Directly demonstrated that CFB is the catalytic serine protease subunit of the alternative pathway C3 convertase, defining its core enzymatic role.","evidence":"In vitro C3 convertase reconstitution with purified trout Bf, C3, factor D and Mg2+-EGTA; hemolytic and cleavage assays","pmids":["9780182"],"confidence":"High","gaps":["Carried out with trout orthologs; human enzymatic kinetics not addressed","Convertase decay/regulation not examined"]},{"year":1998,"claim":"Clarified that teleost Bf gene duplications arose independently of the mammalian Bf/C2 duplication, refining the gene family's evolutionary history.","evidence":"Genomic PAC hybridization, cDNA screening, and phylogenetic analysis in zebrafish","pmids":["9874500"],"confidence":"Medium","gaps":["No functional characterization of duplicated Bf products"]},{"year":2004,"claim":"Proposed the ancestral five-SCR state of the Bf/C2 family and a mechanism for SCR number evolution via exon deletion.","evidence":"cDNA cloning and RT-PCR splicing analysis of sea urchin SpBf isoforms","pmids":["15448941"],"confidence":"Low","gaps":["Splice variant proteins not functionally reconstituted","Relevance to vertebrate CFB activity not established"]},{"year":2007,"claim":"Established that the modular domain architecture enabling CFB cleavage and convertase formation is conserved from cartilaginous fish.","evidence":"cDNA cloning, domain mapping, and phylogenetic analysis of nurse shark Bf/C2 genes","pmids":["17482263"],"confidence":"Medium","gaps":["Cleavage at the predicted factor D site not experimentally verified","No functional convertase assay"]},{"year":2010,"claim":"Linked a CFB coding mutation to human disease, implicating gain-of-function alternative pathway dysregulation in atypical hemolytic uremic syndrome.","evidence":"Clinical genetic sequencing of CFB exons in an aHUS patient identifying p.Lys533Arg","pmids":["20108004"],"confidence":"Low","gaps":["This specific mutation not functionally validated in vitro","Single patient observation"]},{"year":2022,"claim":"Extended CFB beyond opsonization by placing it upstream of C3 in a signaling cascade driving ceramide biosynthesis and tubular injury.","evidence":"Cfb knockout mice, HK-2 siRNA knockdown, C3 knockdown epistasis, and pharmacological/ceramide rescue under high-glucose conditions","pmids":["36546481"],"confidence":"High","gaps":["Mechanism by which CFB activates NF-κB upstream of C3 in tubular cells not resolved","Whether convertase activity is required for the signaling role not tested"]},{"year":2023,"claim":"Defined how a human CFB SNP impairs function, showing G252S creates a glycosylation site that reduces C3b binding, cleavage, and complement-driven phagocytosis.","evidence":"Site-directed mutagenesis, cell-free C3b binding/cleavage assays, macrophage phagocytosis flow cytometry, and patient serum assays","pmids":["37080587"],"confidence":"High","gaps":["Structural basis of how the de novo glycan blocks C3b binding not resolved","In vivo consequences in Crohn's disease not directly demonstrated"]},{"year":null,"claim":"How CFB's convertase activity relates mechanistically to its C3-dependent NF-κB/ceramide signaling role, and whether disease variants act through one or both functions, remains unresolved.","evidence":"","pmids":[],"confidence":"High","gaps":["No structural model linking variant sites to function","Receptor/effector coupling CFB to intracellular NF-κB signaling unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,5]},{"term_id":"GO:0016787","term_label":"hydrolase activity","supporting_discovery_ids":[0]}],"localization":[{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[0,5]}],"pathway":[{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[0,5]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[6]}],"complexes":["Alternative pathway C3 convertase (C3bBb)"],"partners":["C3","CFD"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P00751","full_name":"Complement factor B","aliases":["C3/C5 convertase","Glycine-rich beta glycoprotein","GBG","PBF2","Properdin factor B"],"length_aa":764,"mass_kda":85.5,"function":"Precursor of the catalytic component of the C3 and C5 convertase complexes of the alternative 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:3638964, PubMed:624565, PubMed:6554279, PubMed:6919543, PubMed:9748277). The alternative complement pathway acts as an amplification loop that enhances other complement pathways (classical, lectin and GZMK) by promoting formation of additional C3 and C5 convertases (PubMed:3638964, PubMed:624565, PubMed:6554279, PubMed:6919543, PubMed:9748277). CFB is cleaved and activated by CFD to generate Ba and Bb chains; Bb chain constituting the catalytic component of the C3 and C5 convertases (PubMed:6769474, PubMed:9748277) Serine protease component of the complement C3 and C5 convertase complexes of the alternative complement pathway (PubMed:30643019, PubMed:3638964, PubMed:624565, PubMed:6554279, PubMed:6919543). Following cleavage and activation by factor D (CFD), forms the C3 convertase together with complement C3b (PubMed:3638964, PubMed:624565, PubMed:6554279, PubMed:6919543, PubMed:9748277). As part of the C3 convertase, cleaves and activates C3 into C3a anaphylatoxin and C3b opsonin, the next components of the complement pathways (PubMed:3638964, PubMed:624565, PubMed:6554279, PubMed:6919543, PubMed:9748277). When an additional complement C3b molecule binds to the C3 convertase, forms the C5 convertase, which cleaves and activates C5 into C5a anaphylatoxin and C5b component of the membrane attack complex (PubMed:30643019, PubMed:624565, PubMed:6554279) Involved in proliferation and differentiation of preactivated B-lymphocytes, rapid spreading of peripheral blood monocytes, stimulation of lymphocyte blastogenesis and lysis of erythrocytes","subcellular_location":"Cell surface","url":"https://www.uniprot.org/uniprotkb/P00751/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CFB","classification":"Not Classified","n_dependent_lines":15,"n_total_lines":1208,"dependency_fraction":0.012417218543046357},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/CFB","total_profiled":1310},"omim":[{"mim_id":"615561","title":"COMPLEMENT FACTOR B DEFICIENCY; CFBD","url":"https://www.omim.org/entry/615561"},{"mim_id":"615489","title":"MACULAR DEGENERATION, AGE-RELATED, 14; ARMD14","url":"https://www.omim.org/entry/615489"},{"mim_id":"613927","title":"COMPLEMENT COMPONENT 2; C2","url":"https://www.omim.org/entry/613927"},{"mim_id":"612924","title":"HEMOLYTIC UREMIC SYNDROME, ATYPICAL, SUSCEPTIBILITY TO, 4; AHUS4","url":"https://www.omim.org/entry/612924"},{"mim_id":"612923","title":"HEMOLYTIC UREMIC SYNDROME, ATYPICAL, SUSCEPTIBILITY TO, 3; AHUS3","url":"https://www.omim.org/entry/612923"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Endoplasmic reticulum","reliability":"Approved"},{"location":"Vesicles","reliability":"Approved"},{"location":"Cell Junctions","reliability":"Additional"}],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"liver","ntpm":2370.8}],"url":"https://www.proteinatlas.org/search/CFB"},"hgnc":{"alias_symbol":["H2-Bf"],"prev_symbol":["BFD","BF"]},"alphafold":{"accession":"P00751","domains":[{"cath_id":"2.10.70.10","chopping":"43-99","consensus_level":"high","plddt":86.7296,"start":43,"end":99},{"cath_id":"2.10.70.10","chopping":"104-218","consensus_level":"high","plddt":94.413,"start":104,"end":218},{"cath_id":"3.40.50.410","chopping":"232-247_267-468","consensus_level":"high","plddt":87.9477,"start":232,"end":468},{"cath_id":"2.40.10.120","chopping":"489-755","consensus_level":"medium","plddt":90.8607,"start":489,"end":755}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P00751","model_url":"https://alphafold.ebi.ac.uk/files/AF-P00751-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P00751-F1-predicted_aligned_error_v6.png","plddt_mean":86.25},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CFB","jax_strain_url":"https://www.jax.org/strain/search?query=CFB"},"sequence":{"accession":"P00751","fasta_url":"https://rest.uniprot.org/uniprotkb/P00751.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P00751/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P00751"}},"corpus_meta":[{"pmid":"7605629","id":"PMC_7605629","title":"Winged 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Molecular brain research","url":"https://pubmed.ncbi.nlm.nih.gov/8738140","citation_count":15,"is_preprint":false},{"pmid":"25666387","id":"PMC_25666387","title":"BF-1--a novel selective 5-HT2B receptor antagonist blocking neurogenic dural plasma protein extravasation in guinea pigs.","date":"2015","source":"European journal of pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/25666387","citation_count":14,"is_preprint":false},{"pmid":"36965551","id":"PMC_36965551","title":"Is BF.7 more infectious than other Omicron subtypes: Insights from structural and simulation studies of BF.7 spike RBD variant.","date":"2023","source":"International journal of biological macromolecules","url":"https://pubmed.ncbi.nlm.nih.gov/36965551","citation_count":14,"is_preprint":false},{"pmid":"37721934","id":"PMC_37721934","title":"Broad protective RBD heterotrimer vaccines neutralize SARS-CoV-2 including Omicron sub-variants XBB/BQ.1.1/BF.7.","date":"2023","source":"PLoS 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chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/36219965","citation_count":13,"is_preprint":false},{"pmid":"30368132","id":"PMC_30368132","title":"PEGylated BF2-Azadipyrromethene (NIR-AZA) fluorophores, for intraoperative imaging.","date":"2018","source":"European journal of medicinal chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/30368132","citation_count":13,"is_preprint":false},{"pmid":"37403923","id":"PMC_37403923","title":"Serum neutralization of SARS-CoV-2 Omicron BA.2, BA.2.75, BA.2.76, BA.5, BF.7, BQ.1.1 and XBB.1.5 in individuals receiving Evusheld.","date":"2023","source":"Journal of medical virology","url":"https://pubmed.ncbi.nlm.nih.gov/37403923","citation_count":13,"is_preprint":false},{"pmid":"39211629","id":"PMC_39211629","title":"A BODIPY-Naphtholimine-BF2 Dyad for Precision Photodynamic Therapy, Targeting, and Dual Imaging of Endoplasmic Reticulum and Lipid Droplets in Cancer.","date":"2024","source":"JACS Au","url":"https://pubmed.ncbi.nlm.nih.gov/39211629","citation_count":13,"is_preprint":false},{"pmid":"3905786","id":"PMC_3905786","title":"The ferredoxin-NADP+ oxidoreductase-binding protein is not the 17-kDa component of the cytochrome b/f complex.","date":"1985","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/3905786","citation_count":13,"is_preprint":false},{"pmid":"37362941","id":"PMC_37362941","title":"High expression of antimicrobial peptides cathelicidin-BF in Pichia pastoris and verification of its activity.","date":"2023","source":"Frontiers in microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/37362941","citation_count":12,"is_preprint":false},{"pmid":"26876618","id":"PMC_26876618","title":"BFD-22 a new potential inhibitor of BRAF inhibits the metastasis of B16F10 melanoma cells and simultaneously increased the tumor immunogenicity.","date":"2016","source":"Toxicology and applied 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research","url":"https://pubmed.ncbi.nlm.nih.gov/19715734","citation_count":12,"is_preprint":false},{"pmid":"2711369","id":"PMC_2711369","title":"Haplotypes bearing HLA-A, -B, and -DR: Bf and C4 genes in rheumatoid arthritis families.","date":"1989","source":"Tissue antigens","url":"https://pubmed.ncbi.nlm.nih.gov/2711369","citation_count":12,"is_preprint":false},{"pmid":"23981271","id":"PMC_23981271","title":"A cytotoxic protein (BF-CT1) purified from Bungarus fasciatus venom acts through apoptosis, modulation of PI3K/AKT, MAPKinase pathway and cell cycle regulation.","date":"2013","source":"Toxicon : official journal of the International Society on Toxinology","url":"https://pubmed.ncbi.nlm.nih.gov/23981271","citation_count":12,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":52830,"output_tokens":2844,"usd":0.100575,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":9423,"output_tokens":2725,"usd":0.05762,"stage2_stop_reason":"end_turn"},"total_usd":0.158195,"stage1_batch_id":"msgbatch_01ACAxJQabDsht39JXeWG22d","stage2_batch_id":"msgbatch_01QEU22A9U5sbPTgsMzTmvSf","note":"batch pricing = 50% of standard"},"stage1_raw":"Looking through the abstracts, I need to identify which papers are about the canonical human CFB gene (Complement Factor B, also known as BF or H2-Bf in the MHC class III region), versus other genes/proteins that happen to share these aliases.\n\nThe canonical CFB protein is a serine protease of the alternative complement pathway. Let me classify each paper:\n\n- Papers about BF-1/BF-2 (brain factor transcription factors, FOXG1): NOT CFB — these are alias collisions (different gene)\n- Papers about SARS-CoV-2 BF.7 subvariant: NOT CFB\n- Papers about Cathelicidin-BF (snake venom peptide): NOT CFB\n- Papers about BfrB/Bfd (bacterioferritin): NOT CFB\n- Papers about HIV BF recombinants: NOT CFB\n- Papers about ionic liquids [X]BF4: NOT CFB\n- Papers about complement Factor B (Bf/CFB) in complement pathway: INCLUDE\n\nRelevant papers about canonical CFB (complement factor B):\n- PMID 9780182 (rainbow trout Bf molecules - complement function)\n- PMID 8824158 (medaka Bf/C2)\n- PMID 9874500 (zebrafish Bf)\n- PMID 37080587 (CFB G252S mutation, cleavage, phagocytosis)\n- PMID 36546481 (CFB in diabetic kidney disease, ceramide pathway)\n- PMID 20108004 (CFB mutation in aHUS)\n- PMID 15448941 (sea urchin SpBf)\n- PMID 17482263 (nurse shark Bf/C2)\n- PMID 22138130 (catfish Bf/C2)\n- PMID 22365989 (grass carp Bf/C2)\n- PMID 1916952 (BF allelic hemolytic activity)\n- PMID 64058xx (various AMD association studies - mostly genetic association, exclude)\n- PMID 12974797 (C3 F and BF S allotypes in Chagas disease - allotype associations)\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1998,\n      \"finding\": \"Two rainbow trout complement Factor B molecules (Bf-1 and Bf-2) were isolated and shown to form the alternative pathway C3 convertase in vitro; both were cleaved into Ba- and Bb-like fragments in the presence of purified trout C3, factor D, and Mg2+-EGTA, confirming their serine protease role as the catalytic subunit of the alternative pathway C3 convertase.\",\n      \"method\": \"In vitro C3 convertase reconstitution with purified components; hemolytic activity assays; protein cleavage analysis\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution of C3 convertase activity with purified components from a defined vertebrate ortholog, single lab with multiple functional readouts\",\n      \"pmids\": [\"9780182\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"The Japanese medaka Bf/C2 gene was shown to be a single-copy gene encoding a single ancestral molecule with equal similarity to mammalian factor B and C2, and with identical exon-intron organization to mammalian Bf and C2 genes, demonstrating conservation of genomic structure across vertebrates.\",\n      \"method\": \"cDNA cloning, Southern blotting, genomic mapping, sequence analysis\",\n      \"journal\": \"Immunogenetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct genomic and cDNA characterization with structural validation, single lab with multiple methods\",\n      \"pmids\": [\"8824158\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"BF allelic variants (F and S) differ in hemolytic activity: BF F allele showed lower hemolytic activity than BF S in heterozygous individuals, despite BF F being present at higher protein concentration; this association of low hemolysis with specific HLA haplotypes (particularly B35) indicates allele-specific functional differences in complement activation capacity.\",\n      \"method\": \"Agarose overlay hemolytic assay; crossed immunoelectrophoresis for protein quantitation; HLA haplotyping\",\n      \"journal\": \"Immunogenetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — direct functional hemolytic assay with protein quantitation, single lab, single study\",\n      \"pmids\": [\"1916952\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Nurse shark Bf/C2 genes (GcBf/C2-1 and GcBf/C2-2) encode proteins with conserved domain architecture: leader peptide, three CCPs, one VWFA domain, and a serine protease domain with a putative factor D/C1s/MASP cleavage site, establishing that the structural organization enabling CFB cleavage and complement activation is conserved from cartilaginous fish.\",\n      \"method\": \"cDNA cloning, Southern blotting, structural domain analysis, phylogenetic analysis\",\n      \"journal\": \"Developmental and comparative immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — structural characterization of ortholog with domain mapping, single lab\",\n      \"pmids\": [\"17482263\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"A novel missense mutation in exon 12 of the CFB gene (c.1598A>G, p.Lys533Arg) was identified in a patient with atypical hemolytic uremic syndrome (aHUS), demonstrating that gain-of-function mutations in CFB can cause dysregulation of the alternative complement pathway leading to aHUS.\",\n      \"method\": \"Clinical genetic sequencing of CFB exons in an aHUS patient; mutation identification\",\n      \"journal\": \"Pediatric nephrology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — clinical mutation identification without in vitro functional validation of this specific mutation\",\n      \"pmids\": [\"20108004\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"A non-synonymous SNP in CFB (rs4151651, G252S) associated with perianal Crohn's disease was shown by in vitro reconstitution to reduce binding of recombinant S252 CFB to C3b, impair CFB cleavage (activation), and reduce complement-driven macrophage phagocytosis and cytokine secretion compared to wild-type G252 CFB; the S252 substitution generates a de novo glycosylation site. Serum from homozygous risk patients showed decreased macrophage phagocytosis.\",\n      \"method\": \"Site-directed mutagenesis of human CFB plasmid; cell-free C3b binding and cleavage assays; macrophage phagocytosis assay by flow cytometry; serum functional assays\",\n      \"journal\": \"Gut\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — cell-free reconstitution with mutagenesis plus functional phagocytosis assays and patient serum validation, multiple orthogonal methods in a single rigorous study\",\n      \"pmids\": [\"37080587\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CFB deficiency (Cfb knockout) in diabetic mice reduced tubulointerstitial injury and ceramide biosynthesis. In vitro, CFB knockdown in HK-2 cells under high-glucose conditions reduced NF-κB p65 expression, which in turn reduced transcription of ceramide synthase CERS3, thereby decreasing ceramide biosynthesis and alleviating ER stress, oxidative stress, and apoptosis. C3 knockdown abolished CFB-mediated NF-κB signaling activation and ceramide biosynthesis, placing CFB upstream of C3 in this pathway.\",\n      \"method\": \"Cfb knockout mouse model; siRNA knockdown in HK-2 cells; exogenous ceramide supplementation rescue experiment; fumonisin B1 (CERS inhibitor) rescue in CFB-overexpressing cells; NF-κB signaling analysis; C3 knockdown epistasis\",\n      \"journal\": \"JCI insight\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knockout + siRNA knockdown + epistasis (C3 KD) + pharmacological rescue, multiple orthogonal methods establishing pathway position\",\n      \"pmids\": [\"36546481\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Zebrafish were shown to possess two independent Bf gene duplications (but no C2 or C4 genes), demonstrating that Bf duplication in teleosts occurred independently from the Bf/C2 duplication event in mammals, and establishing that bony fish rely on expanded Bf genes rather than a separate C2 gene for complement function.\",\n      \"method\": \"Genomic PAC clone hybridization; cDNA library screening; Southern blotting; phylogenetic analysis\",\n      \"journal\": \"Scandinavian journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — direct genomic characterization with multiple molecular methods, single lab\",\n      \"pmids\": [\"9874500\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"The sea urchin SpBf (Sp152) contains five short consensus repeats (SCRs), proposed as the ancestral state for the Bf/C2 gene family; three alternatively spliced isoforms were identified, one (Sp152Δ4) encoding an in-frame deletion of SCR4 producing a functional four-SCR protein, providing evidence for how SCR number evolved in the Bf/C2 family through exon deletion.\",\n      \"method\": \"cDNA cloning; RT-PCR alternative splicing analysis; sequence analysis; expression profiling\",\n      \"journal\": \"Immunogenetics\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — cloning and splicing characterization without functional reconstitution of the variant proteins\",\n      \"pmids\": [\"15448941\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"Complement Factor B (CFB) is a serine protease that serves as the catalytic subunit of the alternative pathway C3 convertase; it binds C3b, is cleaved at a conserved site by factor D into Ba and Bb fragments to form the active convertase, and gain-of-function or loss-of-function mutations in CFB (including the G252S variant that creates a de novo glycosylation site) impair C3b binding, cleavage, and downstream complement-driven phagocytosis, while CFB-mediated complement activation also drives NF-κB signaling and ceramide biosynthesis in renal tubular cells through a C3-dependent pathway.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"Complement Factor B (CFB) is the catalytic subunit of the alternative pathway C3 convertase, an evolutionarily ancient component of innate immune complement activation [#0]. CFB assembles with C3b and, upon cleavage by factor D into Ba and Bb fragments, forms the active convertase that drives C3-dependent complement amplification [#0]. The domain architecture underlying this function — short consensus repeats (SCRs/CCPs), a von Willebrand factor A domain, and a C-terminal serine protease domain bearing the factor D cleavage site — is deeply conserved across vertebrates [#3]. Beyond its classical role in opsonization, CFB acts upstream of C3 to activate NF-\\u03baB signaling, which induces the ceramide synthase CERS3 and ceramide biosynthesis in renal tubular cells, linking complement activation to ER stress, oxidative stress, and apoptosis in diabetic tubulointerstitial injury [#6]. CFB variants alter complement function in human disease: a gain-of-function mutation (p.Lys533Arg) is associated with atypical hemolytic uremic syndrome through dysregulated alternative pathway activation [#4], while the G252S substitution generates a de novo glycosylation site that reduces C3b binding, impairs CFB cleavage, and diminishes complement-driven macrophage phagocytosis in perianal Crohn's disease [#5].\",\n  \"teleology\": [\n    {\n      \"year\": 1991,\n      \"claim\": \"Established that allelic variation in CFB produces functional differences in complement activation, showing the protein's activity is not uniform across the population.\",\n      \"evidence\": \"Hemolytic overlay assay with protein quantitation and HLA haplotyping of human BF F and S allotypes\",\n      \"pmids\": [\"1916952\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular basis of the F/S activity difference not defined\", \"Single study without structural follow-up\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Resolved the evolutionary origin of CFB by showing a single ancestral Bf/C2 gene with conserved exon-intron organization predates the mammalian Bf/C2 split.\",\n      \"evidence\": \"cDNA cloning, genomic mapping, and sequence analysis of the medaka Bf/C2 gene\",\n      \"pmids\": [\"8824158\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional convertase activity of the ancestral molecule not tested\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Directly demonstrated that CFB is the catalytic serine protease subunit of the alternative pathway C3 convertase, defining its core enzymatic role.\",\n      \"evidence\": \"In vitro C3 convertase reconstitution with purified trout Bf, C3, factor D and Mg2+-EGTA; hemolytic and cleavage assays\",\n      \"pmids\": [\"9780182\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Carried out with trout orthologs; human enzymatic kinetics not addressed\", \"Convertase decay/regulation not examined\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Clarified that teleost Bf gene duplications arose independently of the mammalian Bf/C2 duplication, refining the gene family's evolutionary history.\",\n      \"evidence\": \"Genomic PAC hybridization, cDNA screening, and phylogenetic analysis in zebrafish\",\n      \"pmids\": [\"9874500\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No functional characterization of duplicated Bf products\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Proposed the ancestral five-SCR state of the Bf/C2 family and a mechanism for SCR number evolution via exon deletion.\",\n      \"evidence\": \"cDNA cloning and RT-PCR splicing analysis of sea urchin SpBf isoforms\",\n      \"pmids\": [\"15448941\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Splice variant proteins not functionally reconstituted\", \"Relevance to vertebrate CFB activity not established\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Established that the modular domain architecture enabling CFB cleavage and convertase formation is conserved from cartilaginous fish.\",\n      \"evidence\": \"cDNA cloning, domain mapping, and phylogenetic analysis of nurse shark Bf/C2 genes\",\n      \"pmids\": [\"17482263\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Cleavage at the predicted factor D site not experimentally verified\", \"No functional convertase assay\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Linked a CFB coding mutation to human disease, implicating gain-of-function alternative pathway dysregulation in atypical hemolytic uremic syndrome.\",\n      \"evidence\": \"Clinical genetic sequencing of CFB exons in an aHUS patient identifying p.Lys533Arg\",\n      \"pmids\": [\"20108004\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"This specific mutation not functionally validated in vitro\", \"Single patient observation\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Extended CFB beyond opsonization by placing it upstream of C3 in a signaling cascade driving ceramide biosynthesis and tubular injury.\",\n      \"evidence\": \"Cfb knockout mice, HK-2 siRNA knockdown, C3 knockdown epistasis, and pharmacological/ceramide rescue under high-glucose conditions\",\n      \"pmids\": [\"36546481\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which CFB activates NF-\\u03baB upstream of C3 in tubular cells not resolved\", \"Whether convertase activity is required for the signaling role not tested\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Defined how a human CFB SNP impairs function, showing G252S creates a glycosylation site that reduces C3b binding, cleavage, and complement-driven phagocytosis.\",\n      \"evidence\": \"Site-directed mutagenesis, cell-free C3b binding/cleavage assays, macrophage phagocytosis flow cytometry, and patient serum assays\",\n      \"pmids\": [\"37080587\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of how the de novo glycan blocks C3b binding not resolved\", \"In vivo consequences in Crohn's disease not directly demonstrated\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How CFB's convertase activity relates mechanistically to its C3-dependent NF-\\u03baB/ceramide signaling role, and whether disease variants act through one or both functions, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structural model linking variant sites to function\", \"Receptor/effector coupling CFB to intracellular NF-\\u03baB signaling unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 5]},\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [0, 5]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [0, 5]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [6]}\n    ],\n    \"complexes\": [\"Alternative pathway C3 convertase (C3bBb)\"],\n    \"partners\": [\"C3\", \"CFD\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}