{"gene":"ALB","run_date":"2026-06-09T22:02:43","timeline":{"discoveries":[{"year":2023,"finding":"WTAP, an m6A methyltransferase, negatively regulates ALB mRNA expression in osteosarcoma cells in an m6A-dependent manner. Me-RIP and dual luciferase reporter assays confirmed that WTAP targets ALB mRNA for m6A modification, reducing its stability. Silencing WTAP increased ALB expression, which in turn inhibited osteosarcoma cell viability, migration, and invasion, while ALB knockdown reversed these effects.","method":"Me-RIP, dual luciferase reporter assay, mRNA stability assay, m6A quantification, wound healing/CCK-8/transwell assays, xenograft model","journal":"Environmental toxicology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (Me-RIP, dual luciferase, mRNA stability) in a single lab establishing m6A writer-target relationship for ALB mRNA","pmids":["36988233","36690262"],"is_preprint":false},{"year":2024,"finding":"Reduced-thiol albumin (SH-Alb) suppresses pro-inflammatory and pro-fibrotic macrophage phenotype remodeling via the MAPK signaling pathway and promotes SIRT3 expression, which deacetylates SOD2 to reduce mitochondrial ROS accumulation, thereby attenuating liver fibrosis. Commercial oxidized albumin (R-Alb) lacked these effects, establishing that the thiol (Cys34) redox state of ALB is mechanistically critical for its immunomodulatory and antioxidant activity.","method":"In vitro macrophage treatment assays, Western blotting, MAPK pathway analysis, SIRT3/SOD2 activity measurements, hepatic stellate cell co-culture, in vivo mouse liver fibrosis model","journal":"Biomedicine & pharmacotherapy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — single lab with multiple orthogonal methods (in vitro and in vivo) linking ALB thiol state to SIRT3-SOD2 axis and MAPK pathway","pmids":["38876053"],"is_preprint":false},{"year":2025,"finding":"ALB overexpression in clear cell renal cell carcinoma (ccRCC) cells suppresses proliferation, migration, invasion, and epithelial-mesenchymal transition (EMT), and activates endoplasmic reticulum stress (ERS) in vitro and in vivo. ALB expression showed a negative association with SPARC, and glycolytic flux analyses revealed that ALB overexpression reprograms glycolysis by reducing glycolytic intermediates, glucose uptake, and lactate production; silencing ALB enhanced glycolysis and malignant phenotypes, reversed by glycolysis inhibition or SPARC knockdown.","method":"ALB overexpression and knockdown in ccRCC cell lines, qRT-PCR, Western blotting, proliferation/migration/invasion assays, Seahorse metabolic flux analysis, xenograft in vivo model, Mendelian randomization","journal":"Biochimica et biophysica acta. Molecular basis of disease / Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — single lab, multiple orthogonal functional assays (metabolic flux, EMT markers, SPARC knockdown rescue) establishing ALB-SPARC-glycolysis axis","pmids":["39862995","41610717"],"is_preprint":false},{"year":2017,"finding":"Heterozygous gain-of-function variants in the ALB gene (e.g., p.Arg242His) cause familial dysalbuminemic hyperthyroxinemia (FDH) by altering the albumin-binding affinity for thyroid hormones, resulting in elevated circulating total T4 with normal thyroid function. Sanger sequencing confirmed the ALB variant as the molecular cause, and 3D protein modeling indicated the mutation site affects hormone-binding regions.","method":"Sanger sequencing of ALB gene, serum protein electrophoresis, thyroid function testing, 3D structural modeling","journal":"Annals of laboratory medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic and biochemical characterization in multiple family members across independent reports, with structural modeling of binding site","pmids":["27834068","34142517","38736368"],"is_preprint":false},{"year":2019,"finding":"Congenital analbuminemia (CAA) is caused by homozygous or compound heterozygous loss-of-function mutations in the ALB gene, resulting in extremely low serum albumin. DNA sequencing confirmed the causative ALB SNP in a Korean patient with hypoalbuminemia, hypocalcemia, and vitamin D deficiency, establishing that ALB-bound calcium and vitamin D transport depends on functional albumin.","method":"DNA sequencing, laboratory phenotyping, exclusion of secondary causes of hypoalbuminemia","journal":"Yonsei medical journal","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single case report with genetic confirmation, no direct mechanistic in vitro assay","pmids":["31250585"],"is_preprint":false},{"year":2010,"finding":"Korean patients with bisalbuminemia harbor ALB gene missense mutations (e.g., Nagasaki-1 Asp293Gly and novel Lys198Ile) that produce electrophoretically distinct albumin variants. Analysis of albumin-binding characteristics and 3D modeling indicated that neither mutation site is located at the protein-binding loci for steroids or thyroid hormones, and serum concentrations of albumin-bound substances were not affected in these patients.","method":"Serum protein electrophoresis, ALB gene sequencing, 3D structural modeling, biochemical binding analysis","journal":"The Korean journal of laboratory medicine","confidence":"Low","confidence_rationale":"Tier 3 / Weak — clinical genetic characterization with structural modeling but no direct in vitro binding assay or mutagenesis reconstitution","pmids":["20603593"],"is_preprint":false},{"year":2020,"finding":"In FLC-4 human hepatocellular carcinoma cells cultured in serum-free medium, depletion of both ornithine and arginine significantly reduced albumin (ALB) mRNA and protein production. Arginine increased mRNA of liver-enriched transcription factors CEBPB and HNF1A that regulate ALB expression, while both activating and inhibitory C/EBPβ isoforms were elevated by arginine. These data indicate that ornithine and arginine differentially regulate hepatocyte ALB expression through distinct effects on C/EBPβ isoforms.","method":"Serum-free cell culture with defined amino acid compositions, qPCR, ELISA, Western blotting for ALB and C/EBPβ isoforms","journal":"Human cell","confidence":"Low","confidence_rationale":"Tier 3 / Moderate — single lab, two orthogonal methods (qPCR + ELISA + WB) but only in one cell line without direct promoter/TF binding assay","pmids":["32474770"],"is_preprint":false},{"year":2026,"finding":"Loss-of-function (LoF) variants in the ALB gene are paradoxically associated with markedly elevated LDL-C (mean increase ~38 mg/dL), in contrast to physiological or polygenic hypoalbuminemia which associates with decreased LDL-C. This divergent relationship establishes that monogenic ALB LoF causes a distinct mechanism of hypercholesterolemia, representing a previously unrecognized cause of severe LDL elevation.","method":"Population biobank cohort study (n>560,000), genetic variant classification, electronic health record linkage, linear regression, meta-analysis across two independent cohorts","journal":"Journal of the American College of Cardiology","confidence":"Medium","confidence_rationale":"Tier 2 / Strong — replicated across two large independent biobanks with genetic and clinical data, establishing a mechanistically distinct genotype-phenotype relationship","pmids":["42126373"],"is_preprint":false}],"current_model":"Human serum albumin (ALB) functions as a multifunctional plasma transport protein whose thiol redox state (Cys34) governs its immunomodulatory and antioxidant activity via the SIRT3-SOD2 axis in macrophages; gain-of-function missense variants at Arg242 alter thyroid hormone-binding affinity causing familial dysalbuminemic hyperthyroxinemia, while loss-of-function ALB variants paradoxically elevate LDL-C through a mechanism distinct from physiological hypoalbuminemia; ALB mRNA is negatively regulated by WTAP-mediated m6A modification in osteosarcoma cells; and in renal cell carcinoma ALB suppresses EMT and glycolysis potentially through negative regulation of SPARC and activation of endoplasmic reticulum stress."},"narrative":{"mechanistic_narrative":"ALB encodes a multifunctional plasma protein whose biological roles span transport, redox modulation, and tumor suppression, and whose loss has distinct systemic metabolic consequences [PMID:38876053, PMID:42126373]. Its immunomodulatory and antioxidant function depends on the redox state of the Cys34 thiol: reduced-thiol albumin suppresses pro-inflammatory and pro-fibrotic macrophage remodeling via MAPK signaling and induces SIRT3, which deacetylates SOD2 to limit mitochondrial ROS and attenuate liver fibrosis, an activity absent in oxidized albumin [PMID:38876053]. As a transport protein, functional albumin is required for circulating calcium and vitamin D handling, and missense gain-of-function variants at Arg242 (p.Arg242His) alter thyroid hormone-binding affinity to cause familial dysalbuminemic hyperthyroxinemia, while homozygous or compound heterozygous loss-of-function mutations cause congenital analbuminemia [PMID:27834068, PMID:34142517, PMID:38736368, PMID:31250585]. Monogenic ALB loss-of-function additionally produces a distinct form of severe LDL-C elevation, diverging mechanistically from polygenic hypoalbuminemia [PMID:42126373]. In cancer, ALB acts as a tumor suppressor: in clear cell renal cell carcinoma its overexpression activates endoplasmic reticulum stress, suppresses EMT, and reprograms glycolysis through negative regulation of SPARC, while its hepatic mRNA expression is destabilized by WTAP-mediated m6A modification in osteosarcoma [PMID:36988233, PMID:36690262, PMID:39862995, PMID:41610717]. ALB transcription in hepatocytes is regulated by amino acid availability through C/EBPβ and HNF1A [PMID:32474770].","teleology":[{"year":2010,"claim":"Established that some ALB missense variants alter electrophoretic mobility (bisalbuminemia) without affecting ligand binding, defining which structural regions are functionally neutral for steroid and hormone transport.","evidence":"ALB gene sequencing, serum protein electrophoresis, and 3D structural modeling in Korean patients","pmids":["20603593"],"confidence":"Low","gaps":["No direct in vitro binding assay or mutagenesis reconstitution","Single patient cohort","Does not define which residues are critical for binding"]},{"year":2017,"claim":"Identified the molecular basis of familial dysalbuminemic hyperthyroxinemia, showing that gain-of-function ALB variants at Arg242 raise albumin affinity for thyroid hormone and elevate total T4 without true thyroid dysfunction.","evidence":"Sanger sequencing, serum protein electrophoresis, thyroid function testing, and 3D modeling across family members and independent reports","pmids":["27834068","34142517","38736368"],"confidence":"Medium","gaps":["Direct in vitro hormone-binding kinetics of the mutant not measured","Quantitative affinity change not established","Mechanism of binding-site distortion inferred from modeling only"]},{"year":2019,"claim":"Demonstrated that functional albumin is required for systemic calcium and vitamin D transport by linking loss-of-function ALB mutations (congenital analbuminemia) to hypocalcemia and vitamin D deficiency.","evidence":"DNA sequencing and laboratory phenotyping in a patient, with exclusion of secondary hypoalbuminemia","pmids":["31250585"],"confidence":"Low","gaps":["Single case report without in vitro mechanistic assay","Transport defect inferred from clinical phenotype","Variant functional impact not reconstituted"]},{"year":2020,"claim":"Showed that hepatocyte ALB expression is controlled by amino acid availability, with ornithine and arginine regulating ALB transcription through C/EBPβ isoforms and HNF1A.","evidence":"Serum-free defined amino acid culture of FLC-4 hepatocellular carcinoma cells with qPCR, ELISA, and Western blotting","pmids":["32474770"],"confidence":"Low","gaps":["Single cell line","No direct promoter or transcription-factor binding assay","Causal role of individual C/EBPβ isoforms not dissected"]},{"year":2023,"claim":"Established post-transcriptional control of ALB by showing WTAP-mediated m6A modification destabilizes ALB mRNA in osteosarcoma, where restored ALB suppresses malignant phenotypes.","evidence":"Me-RIP, dual luciferase reporter, mRNA stability assays, and functional WTAP/ALB knockdown in osteosarcoma cells plus xenograft","pmids":["36988233","36690262"],"confidence":"Medium","gaps":["m6A reader mediating decay not identified","Mechanism by which ALB suppresses tumor cells not defined here","Limited to osteosarcoma context"]},{"year":2024,"claim":"Defined the mechanistic basis of ALB's antioxidant/immunomodulatory activity, showing the Cys34 thiol redox state drives macrophage reprogramming via MAPK and the SIRT3-SOD2 axis to reduce mitochondrial ROS and liver fibrosis.","evidence":"In vitro macrophage assays, MAPK analysis, SIRT3/SOD2 measurements, hepatic stellate cell co-culture, and in vivo mouse liver fibrosis model comparing reduced vs oxidized albumin","pmids":["38876053"],"confidence":"Medium","gaps":["Direct mechanism linking Cys34 redox state to SIRT3 induction unresolved","Receptor/sensor on macrophages not identified","Single lab"]},{"year":2025,"claim":"Established ALB as a tumor suppressor in clear cell renal cell carcinoma acting through ERS activation and SPARC-dependent glycolytic reprogramming.","evidence":"ALB overexpression/knockdown in ccRCC lines, metabolic flux (Seahorse) analysis, EMT markers, SPARC knockdown rescue, xenograft, and Mendelian randomization","pmids":["39862995","41610717"],"confidence":"Medium","gaps":["Direct physical interaction between ALB and SPARC not shown","Mechanism of ERS activation by ALB unclear","Single tumor type"]},{"year":2026,"claim":"Demonstrated that monogenic ALB loss-of-function causes a mechanistically distinct form of severe LDL-C elevation, diverging from the reduced LDL-C seen in polygenic hypoalbuminemia.","evidence":"Population biobank cohort study (n>560,000) with genetic variant classification, EHR linkage, and meta-analysis across two independent cohorts","pmids":["42126373"],"confidence":"Medium","gaps":["Molecular mechanism linking ALB loss to LDL-C elevation not defined","No biochemical or cellular model","Causal pathway from albumin deficiency to cholesterol handling unknown"]},{"year":null,"claim":"How ALB's transport, redox-signaling, and tumor-suppressive functions are integrated, and the molecular pathway connecting ALB loss to LDL-C elevation, remain unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural mechanism linking Cys34 redox to downstream signaling","Mechanism of monogenic ALB-driven hypercholesterolemia unknown","Direct ALB-SPARC interaction unverified"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140104","term_label":"molecular carrier activity","supporting_discovery_ids":[3,4]},{"term_id":"GO:0016209","term_label":"antioxidant activity","supporting_discovery_ids":[1]}],"localization":[{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[3,4,7]}],"pathway":[{"term_id":"R-HSA-382551","term_label":"Transport of small molecules","supporting_discovery_ids":[3,4]}],"complexes":[],"partners":[],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q8TES7","full_name":"Fas-binding factor 1","aliases":["Protein albatross"],"length_aa":1133,"mass_kda":125.4,"function":"Keratin-binding protein required for epithelial cell polarization. Involved in apical junction complex (AJC) assembly via its interaction with PARD3. Required for ciliogenesis","subcellular_location":"Cytoplasm, cytoskeleton, microtubule organizing center, centrosome, centriole; Cytoplasm, cytoskeleton, spindle pole; Cell junction","url":"https://www.uniprot.org/uniprotkb/Q8TES7/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/ALB","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/ALB","total_profiled":1310},"omim":[{"mim_id":"619504","title":"CHOPRA-AMIEL-GORDON SYNDROME; CAGS","url":"https://www.omim.org/entry/619504"},{"mim_id":"618882","title":"IMERSLUND-GRASBECK SYNDROME 2; IGS2","url":"https://www.omim.org/entry/618882"},{"mim_id":"616807","title":"FAS-BINDING FACTOR 1; FBF1","url":"https://www.omim.org/entry/616807"},{"mim_id":"616000","title":"ANALBUMINEMIA; ANALBA","url":"https://www.omim.org/entry/616000"},{"mim_id":"615999","title":"HYPERTHYROXINEMIA, FAMILIAL DYSALBUMINEMIC; FDAH","url":"https://www.omim.org/entry/615999"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Endoplasmic reticulum","reliability":"Approved"},{"location":"Golgi apparatus","reliability":"Approved"}],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"liver","ntpm":198523.8}],"url":"https://www.proteinatlas.org/search/ALB"},"hgnc":{"alias_symbol":[],"prev_symbol":[]},"alphafold":{"accession":"Q8TES7","domains":[{"cath_id":"1.20.5","chopping":"578-735","consensus_level":"high","plddt":94.4742,"start":578,"end":735}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8TES7","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q8TES7-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q8TES7-F1-predicted_aligned_error_v6.png","plddt_mean":62.59},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=ALB","jax_strain_url":"https://www.jax.org/strain/search?query=ALB"},"sequence":{"accession":"Q8TES7","fasta_url":"https://rest.uniprot.org/uniprotkb/Q8TES7.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q8TES7/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8TES7"}},"corpus_meta":[{"pmid":"19242562","id":"PMC_19242562","title":"HCV induces 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children.","date":"2024","source":"Journal of pediatric endocrinology & metabolism : JPEM","url":"https://pubmed.ncbi.nlm.nih.gov/38736368","citation_count":0,"is_preprint":false},{"pmid":"37035928","id":"PMC_37035928","title":"Feasibility analysis of TCB, hs-CRP, and UCB/ALB as outcome measures for dynamic assessment during phototherapy of neonates with Hyperbilirubinemia.","date":"2023","source":"Biotechnology & genetic engineering reviews","url":"https://pubmed.ncbi.nlm.nih.gov/37035928","citation_count":0,"is_preprint":false},{"pmid":"41633373","id":"PMC_41633373","title":"Intramolecular Interactions of Twenty-Eight Amide Derivatives with the C-ALB Kinase using a Theoretical Model as a Therapeutic Alternative to Treat Cancer.","date":"2026","source":"Drug research","url":"https://pubmed.ncbi.nlm.nih.gov/41633373","citation_count":0,"is_preprint":false},{"pmid":"41844948","id":"PMC_41844948","title":"Next-generation platelet concentrate: Alb-PRF outperformed PRP and H-PRF in 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nutritional support.","date":"2025","source":"Journal of medical biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/40837358","citation_count":0,"is_preprint":false},{"pmid":"42074277","id":"PMC_42074277","title":"Alb-PRF Hybrid Membranes Functionalized with Carbonated Hydroxyapatite and Doxycycline for Bone Regeneration and Antimicrobial Control: An In Vitro Study.","date":"2026","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/42074277","citation_count":0,"is_preprint":false},{"pmid":"42126373","id":"PMC_42126373","title":"Monogenic ALB Variants as Determinants of Severe Hypercholesterolemia: A Population-Based Cohort Study.","date":"2026","source":"Journal of the American College of Cardiology","url":"https://pubmed.ncbi.nlm.nih.gov/42126373","citation_count":0,"is_preprint":false},{"pmid":"42251363","id":"PMC_42251363","title":"Electroporation-mediated site-specific knock-in of a human coding sequence into the bovine ALB locus in embryos.","date":"2026","source":"BMC biotechnology","url":"https://pubmed.ncbi.nlm.nih.gov/42251363","citation_count":0,"is_preprint":false},{"pmid":"1380996","id":"PMC_1380996","title":"[Effects of oxygen free radicals on cell growth and productions of alpha-fetoprotein (AFP) and albumin (ALB) by human hepatoma cell line (HH2-6)].","date":"1992","source":"Nihon Shokakibyo Gakkai zasshi = The Japanese journal of gastro-enterology","url":"https://pubmed.ncbi.nlm.nih.gov/1380996","citation_count":0,"is_preprint":false},{"pmid":"41861411","id":"PMC_41861411","title":"Microneedling (MN) combined with albumin gel and liquid platelet-rich fibrin mixtures (Alb-PRF) promotes periodontal soft tissue regeneration in SD rats.","date":"2026","source":"Biomedical materials (Bristol, England)","url":"https://pubmed.ncbi.nlm.nih.gov/41861411","citation_count":0,"is_preprint":false},{"pmid":"42146865","id":"PMC_42146865","title":"Diagnostic Potential of New Systemic Inflammation Markers (MLR, SIRI, CAR, dNLR, ALB/dNLR) in Predicting the Severity of Pathogenic Signs of Rheumatoid Arthritis.","date":"2026","source":"Sovremennye tekhnologii v meditsine","url":"https://pubmed.ncbi.nlm.nih.gov/42146865","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2025.06.27.660518","title":"Hybrid-metagenomics reveal off-target effects of albendazole, ivermectin-albendazole and moxidectin-albendazole on the human gut bacteria","date":"2025-06-27","source":"bioRxiv","url":"https://doi.org/10.1101/2025.06.27.660518","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":47185,"output_tokens":2818,"usd":0.091912,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":9669,"output_tokens":3043,"usd":0.06221,"stage2_stop_reason":"end_turn"},"total_usd":0.154122,"stage1_batch_id":"msgbatch_0179Z2pxRYBsXi2xADneafRw","stage2_batch_id":"msgbatch_01LaY9ZaVdgjWArcZo9eqQE5","note":"batch pricing = 50% of standard"},"stage1_raw":"Looking through these abstracts, I need to identify papers about the canonical human/mammalian ALB gene (serum albumin) and extract mechanistic findings.\n\nLet me classify the papers:\n- Papers about Bacillus subtilis sbo-alb operon (ALB = antilisterial bacteriocin): EXCLUDE (kingdom collision)\n- Papers about Alb-uPA/SCID mouse models (using ALB promoter as a tool): These use the ALB promoter but study HCV/HBV, not ALB protein mechanism - EXCLUDE for ALB mechanism\n- Papers about Alb-PRF (albumin-platelet rich fibrin): These use denatured albumin as scaffold material, not canonical ALB protein mechanism - mostly EXCLUDE\n- Papers about ALB gene variants/FDH: Some relevant\n- Papers about WTAP/m6A modulating ALB: relevant mechanistic finding\n- Papers about SH-Alb/liver fibrosis: relevant\n- Paper about WTAP m6A (PMIDs 36988233 and 36690262): relevant - WTAP modulates ALB mRNA via m6A modification\n- Paper about ALB in ccRCC (39862995, 41610717): functional experiments\n- lncRNA ALB (29246299): EXCLUDE - non-protein locus product\n- Aplysia Alb-1 (18190999): EXCLUDE - different organism, different protein\n- Mo2AlB2 (31199138): EXCLUDE - materials science\n- BPAG1/dt-Alb (16725123): EXCLUDE - about BPAG1, not ALB\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2023,\n      \"finding\": \"WTAP, an m6A methyltransferase, negatively regulates ALB mRNA expression in osteosarcoma cells in an m6A-dependent manner. Me-RIP and dual luciferase reporter assays confirmed that WTAP targets ALB mRNA for m6A modification, reducing its stability. Silencing WTAP increased ALB expression, which in turn inhibited osteosarcoma cell viability, migration, and invasion, while ALB knockdown reversed these effects.\",\n      \"method\": \"Me-RIP, dual luciferase reporter assay, mRNA stability assay, m6A quantification, wound healing/CCK-8/transwell assays, xenograft model\",\n      \"journal\": \"Environmental toxicology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (Me-RIP, dual luciferase, mRNA stability) in a single lab establishing m6A writer-target relationship for ALB mRNA\",\n      \"pmids\": [\"36988233\", \"36690262\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Reduced-thiol albumin (SH-Alb) suppresses pro-inflammatory and pro-fibrotic macrophage phenotype remodeling via the MAPK signaling pathway and promotes SIRT3 expression, which deacetylates SOD2 to reduce mitochondrial ROS accumulation, thereby attenuating liver fibrosis. Commercial oxidized albumin (R-Alb) lacked these effects, establishing that the thiol (Cys34) redox state of ALB is mechanistically critical for its immunomodulatory and antioxidant activity.\",\n      \"method\": \"In vitro macrophage treatment assays, Western blotting, MAPK pathway analysis, SIRT3/SOD2 activity measurements, hepatic stellate cell co-culture, in vivo mouse liver fibrosis model\",\n      \"journal\": \"Biomedicine & pharmacotherapy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — single lab with multiple orthogonal methods (in vitro and in vivo) linking ALB thiol state to SIRT3-SOD2 axis and MAPK pathway\",\n      \"pmids\": [\"38876053\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"ALB overexpression in clear cell renal cell carcinoma (ccRCC) cells suppresses proliferation, migration, invasion, and epithelial-mesenchymal transition (EMT), and activates endoplasmic reticulum stress (ERS) in vitro and in vivo. ALB expression showed a negative association with SPARC, and glycolytic flux analyses revealed that ALB overexpression reprograms glycolysis by reducing glycolytic intermediates, glucose uptake, and lactate production; silencing ALB enhanced glycolysis and malignant phenotypes, reversed by glycolysis inhibition or SPARC knockdown.\",\n      \"method\": \"ALB overexpression and knockdown in ccRCC cell lines, qRT-PCR, Western blotting, proliferation/migration/invasion assays, Seahorse metabolic flux analysis, xenograft in vivo model, Mendelian randomization\",\n      \"journal\": \"Biochimica et biophysica acta. Molecular basis of disease / Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — single lab, multiple orthogonal functional assays (metabolic flux, EMT markers, SPARC knockdown rescue) establishing ALB-SPARC-glycolysis axis\",\n      \"pmids\": [\"39862995\", \"41610717\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Heterozygous gain-of-function variants in the ALB gene (e.g., p.Arg242His) cause familial dysalbuminemic hyperthyroxinemia (FDH) by altering the albumin-binding affinity for thyroid hormones, resulting in elevated circulating total T4 with normal thyroid function. Sanger sequencing confirmed the ALB variant as the molecular cause, and 3D protein modeling indicated the mutation site affects hormone-binding regions.\",\n      \"method\": \"Sanger sequencing of ALB gene, serum protein electrophoresis, thyroid function testing, 3D structural modeling\",\n      \"journal\": \"Annals of laboratory medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic and biochemical characterization in multiple family members across independent reports, with structural modeling of binding site\",\n      \"pmids\": [\"27834068\", \"34142517\", \"38736368\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Congenital analbuminemia (CAA) is caused by homozygous or compound heterozygous loss-of-function mutations in the ALB gene, resulting in extremely low serum albumin. DNA sequencing confirmed the causative ALB SNP in a Korean patient with hypoalbuminemia, hypocalcemia, and vitamin D deficiency, establishing that ALB-bound calcium and vitamin D transport depends on functional albumin.\",\n      \"method\": \"DNA sequencing, laboratory phenotyping, exclusion of secondary causes of hypoalbuminemia\",\n      \"journal\": \"Yonsei medical journal\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single case report with genetic confirmation, no direct mechanistic in vitro assay\",\n      \"pmids\": [\"31250585\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Korean patients with bisalbuminemia harbor ALB gene missense mutations (e.g., Nagasaki-1 Asp293Gly and novel Lys198Ile) that produce electrophoretically distinct albumin variants. Analysis of albumin-binding characteristics and 3D modeling indicated that neither mutation site is located at the protein-binding loci for steroids or thyroid hormones, and serum concentrations of albumin-bound substances were not affected in these patients.\",\n      \"method\": \"Serum protein electrophoresis, ALB gene sequencing, 3D structural modeling, biochemical binding analysis\",\n      \"journal\": \"The Korean journal of laboratory medicine\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — clinical genetic characterization with structural modeling but no direct in vitro binding assay or mutagenesis reconstitution\",\n      \"pmids\": [\"20603593\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"In FLC-4 human hepatocellular carcinoma cells cultured in serum-free medium, depletion of both ornithine and arginine significantly reduced albumin (ALB) mRNA and protein production. Arginine increased mRNA of liver-enriched transcription factors CEBPB and HNF1A that regulate ALB expression, while both activating and inhibitory C/EBPβ isoforms were elevated by arginine. These data indicate that ornithine and arginine differentially regulate hepatocyte ALB expression through distinct effects on C/EBPβ isoforms.\",\n      \"method\": \"Serum-free cell culture with defined amino acid compositions, qPCR, ELISA, Western blotting for ALB and C/EBPβ isoforms\",\n      \"journal\": \"Human cell\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — single lab, two orthogonal methods (qPCR + ELISA + WB) but only in one cell line without direct promoter/TF binding assay\",\n      \"pmids\": [\"32474770\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"Loss-of-function (LoF) variants in the ALB gene are paradoxically associated with markedly elevated LDL-C (mean increase ~38 mg/dL), in contrast to physiological or polygenic hypoalbuminemia which associates with decreased LDL-C. This divergent relationship establishes that monogenic ALB LoF causes a distinct mechanism of hypercholesterolemia, representing a previously unrecognized cause of severe LDL elevation.\",\n      \"method\": \"Population biobank cohort study (n>560,000), genetic variant classification, electronic health record linkage, linear regression, meta-analysis across two independent cohorts\",\n      \"journal\": \"Journal of the American College of Cardiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Strong — replicated across two large independent biobanks with genetic and clinical data, establishing a mechanistically distinct genotype-phenotype relationship\",\n      \"pmids\": [\"42126373\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"Human serum albumin (ALB) functions as a multifunctional plasma transport protein whose thiol redox state (Cys34) governs its immunomodulatory and antioxidant activity via the SIRT3-SOD2 axis in macrophages; gain-of-function missense variants at Arg242 alter thyroid hormone-binding affinity causing familial dysalbuminemic hyperthyroxinemia, while loss-of-function ALB variants paradoxically elevate LDL-C through a mechanism distinct from physiological hypoalbuminemia; ALB mRNA is negatively regulated by WTAP-mediated m6A modification in osteosarcoma cells; and in renal cell carcinoma ALB suppresses EMT and glycolysis potentially through negative regulation of SPARC and activation of endoplasmic reticulum stress.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"ALB encodes a multifunctional plasma protein whose biological roles span transport, redox modulation, and tumor suppression, and whose loss has distinct systemic metabolic consequences [#1, #7]. Its immunomodulatory and antioxidant function depends on the redox state of the Cys34 thiol: reduced-thiol albumin suppresses pro-inflammatory and pro-fibrotic macrophage remodeling via MAPK signaling and induces SIRT3, which deacetylates SOD2 to limit mitochondrial ROS and attenuate liver fibrosis, an activity absent in oxidized albumin [#1]. As a transport protein, functional albumin is required for circulating calcium and vitamin D handling, and missense gain-of-function variants at Arg242 (p.Arg242His) alter thyroid hormone-binding affinity to cause familial dysalbuminemic hyperthyroxinemia, while homozygous or compound heterozygous loss-of-function mutations cause congenital analbuminemia [#3, #4]. Monogenic ALB loss-of-function additionally produces a distinct form of severe LDL-C elevation, diverging mechanistically from polygenic hypoalbuminemia [#7]. In cancer, ALB acts as a tumor suppressor: in clear cell renal cell carcinoma its overexpression activates endoplasmic reticulum stress, suppresses EMT, and reprograms glycolysis through negative regulation of SPARC, while its hepatic mRNA expression is destabilized by WTAP-mediated m6A modification in osteosarcoma [#0, #2]. ALB transcription in hepatocytes is regulated by amino acid availability through C/EBPβ and HNF1A [#6].\",\n  \"teleology\": [\n    {\n      \"year\": 2010,\n      \"claim\": \"Established that some ALB missense variants alter electrophoretic mobility (bisalbuminemia) without affecting ligand binding, defining which structural regions are functionally neutral for steroid and hormone transport.\",\n      \"evidence\": \"ALB gene sequencing, serum protein electrophoresis, and 3D structural modeling in Korean patients\",\n      \"pmids\": [\"20603593\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No direct in vitro binding assay or mutagenesis reconstitution\", \"Single patient cohort\", \"Does not define which residues are critical for binding\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Identified the molecular basis of familial dysalbuminemic hyperthyroxinemia, showing that gain-of-function ALB variants at Arg242 raise albumin affinity for thyroid hormone and elevate total T4 without true thyroid dysfunction.\",\n      \"evidence\": \"Sanger sequencing, serum protein electrophoresis, thyroid function testing, and 3D modeling across family members and independent reports\",\n      \"pmids\": [\"27834068\", \"34142517\", \"38736368\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct in vitro hormone-binding kinetics of the mutant not measured\", \"Quantitative affinity change not established\", \"Mechanism of binding-site distortion inferred from modeling only\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Demonstrated that functional albumin is required for systemic calcium and vitamin D transport by linking loss-of-function ALB mutations (congenital analbuminemia) to hypocalcemia and vitamin D deficiency.\",\n      \"evidence\": \"DNA sequencing and laboratory phenotyping in a patient, with exclusion of secondary hypoalbuminemia\",\n      \"pmids\": [\"31250585\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Single case report without in vitro mechanistic assay\", \"Transport defect inferred from clinical phenotype\", \"Variant functional impact not reconstituted\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Showed that hepatocyte ALB expression is controlled by amino acid availability, with ornithine and arginine regulating ALB transcription through C/EBPβ isoforms and HNF1A.\",\n      \"evidence\": \"Serum-free defined amino acid culture of FLC-4 hepatocellular carcinoma cells with qPCR, ELISA, and Western blotting\",\n      \"pmids\": [\"32474770\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Single cell line\", \"No direct promoter or transcription-factor binding assay\", \"Causal role of individual C/EBPβ isoforms not dissected\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Established post-transcriptional control of ALB by showing WTAP-mediated m6A modification destabilizes ALB mRNA in osteosarcoma, where restored ALB suppresses malignant phenotypes.\",\n      \"evidence\": \"Me-RIP, dual luciferase reporter, mRNA stability assays, and functional WTAP/ALB knockdown in osteosarcoma cells plus xenograft\",\n      \"pmids\": [\"36988233\", \"36690262\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"m6A reader mediating decay not identified\", \"Mechanism by which ALB suppresses tumor cells not defined here\", \"Limited to osteosarcoma context\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Defined the mechanistic basis of ALB's antioxidant/immunomodulatory activity, showing the Cys34 thiol redox state drives macrophage reprogramming via MAPK and the SIRT3-SOD2 axis to reduce mitochondrial ROS and liver fibrosis.\",\n      \"evidence\": \"In vitro macrophage assays, MAPK analysis, SIRT3/SOD2 measurements, hepatic stellate cell co-culture, and in vivo mouse liver fibrosis model comparing reduced vs oxidized albumin\",\n      \"pmids\": [\"38876053\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct mechanism linking Cys34 redox state to SIRT3 induction unresolved\", \"Receptor/sensor on macrophages not identified\", \"Single lab\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Established ALB as a tumor suppressor in clear cell renal cell carcinoma acting through ERS activation and SPARC-dependent glycolytic reprogramming.\",\n      \"evidence\": \"ALB overexpression/knockdown in ccRCC lines, metabolic flux (Seahorse) analysis, EMT markers, SPARC knockdown rescue, xenograft, and Mendelian randomization\",\n      \"pmids\": [\"39862995\", \"41610717\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct physical interaction between ALB and SPARC not shown\", \"Mechanism of ERS activation by ALB unclear\", \"Single tumor type\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Demonstrated that monogenic ALB loss-of-function causes a mechanistically distinct form of severe LDL-C elevation, diverging from the reduced LDL-C seen in polygenic hypoalbuminemia.\",\n      \"evidence\": \"Population biobank cohort study (n>560,000) with genetic variant classification, EHR linkage, and meta-analysis across two independent cohorts\",\n      \"pmids\": [\"42126373\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular mechanism linking ALB loss to LDL-C elevation not defined\", \"No biochemical or cellular model\", \"Causal pathway from albumin deficiency to cholesterol handling unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How ALB's transport, redox-signaling, and tumor-suppressive functions are integrated, and the molecular pathway connecting ALB loss to LDL-C elevation, remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural mechanism linking Cys34 redox to downstream signaling\", \"Mechanism of monogenic ALB-driven hypercholesterolemia unknown\", \"Direct ALB-SPARC interaction unverified\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140104\", \"supporting_discovery_ids\": [3, 4]},\n      {\"term_id\": \"GO:0016209\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [3, 4, 7]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-382551\", \"supporting_discovery_ids\": [3, 4]}\n    ],\n    \"complexes\": [],\n    \"partners\": [],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}