{"gene":"HAMP","run_date":"2026-06-10T01:55:21","timeline":{"discoveries":[{"year":2000,"finding":"HAMP/LEAP-1 (hepcidin) is a 25-residue peptide containing four disulfide bonds (novel disulfide motif) isolated from human blood ultrafiltrate, with antimicrobial activity against Gram-positive bacteria (Bacillus megaterium, B. subtilis, Micrococcus luteus, Staphylococcus carnosus), Gram-negative Neisseria cinerea, and yeast Saccharomyces cerevisiae in radial diffusion assays; expression is predominantly hepatic.","method":"Mass spectrometric isolation from blood ultrafiltrate; radial diffusion antimicrobial assay with synthetic peptide; expression analysis","journal":"FEBS letters","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct biochemical isolation, structural characterization (disulfide bonds), and functional antimicrobial assay with synthetic peptide; foundational discovery paper","pmids":["11034317"],"is_preprint":false},{"year":2003,"finding":"Heterozygous loss-of-function mutations in HAMP (frameshift Met50del IVS2+1(-G) and missense G71D) co-inherited with HFE C282Y mutation cause digenic hereditary hemochromatosis with iron overload severity corresponding to HAMP mutation severity, establishing HAMP as a modifier of HFE-associated iron homeostasis.","method":"Genetic sequencing of HAMP in hemochromatosis families; genotype-phenotype correlation; control chromosome analysis","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis in human families with direct sequencing, replicated across two families; mechanistic inference from loss-of-function mutations","pmids":["12915468"],"is_preprint":false},{"year":2003,"finding":"Heterozygous HAMP mutations (pR59G, pG71D, pR56X) increase phenotypic iron overload expression in HFE pC282Y/pC282Y homozygous patients, and heterozygous mutations in both HFE and HAMP can lead to adult-onset iron overload in a digenic inheritance model.","method":"Cohort sequencing; iron indices comparison; population control analysis","journal":"Blood","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis confirmed across a cohort of 392 patients with matched controls; single lab but large sample","pmids":["14670915"],"is_preprint":false},{"year":2004,"finding":"A mutation in the 5'-UTR of HAMP creates a new upstream initiation codon in a Kozak context, causing ribosomes to select the mutant codon for translation, resulting in non-detectable hepcidin protein in urine and juvenile hemochromatosis; this directly links translational regulation to hepcidin production and iron overload.","method":"Sequencing of HAMP 5'-UTR; hepcidin protein detection in urine; clinical phenotyping; phlebotomy response","journal":"Blood","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct mutation identification with functional consequence (absent protein product) demonstrated by protein assay in two family members","pmids":["15198949"],"is_preprint":false},{"year":2004,"finding":"The HAMP mutation C78T (p.C78T/C70R in mature peptide) disrupts one of the four intramolecular disulfide bonds present in hepcidin, supporting that these conserved cysteines are critical for hepcidin structure and function, with loss causing severe hereditary hemochromatosis.","method":"HAMP gene sequencing; structural analysis of conserved cysteines; clinical phenotype characterization","journal":"Human mutation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mutation disrupts known disulfide bond; functional consequence (severe HH) confirmed in patient; structural inference supported by sequence conservation across vertebrates","pmids":["15024747"],"is_preprint":false},{"year":2004,"finding":"Homozygosity for HAMP mutation C78T (p.C78T), which disrupts a conserved cysteine critical for disulfide bonding, causes juvenile hemochromatosis in a consanguineous family, confirming that the conserved cysteines are required for active hepcidin function.","method":"Direct sequencing of HAMP; clinical phenotype assessment in consanguineous family","journal":"Clinical genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — homozygous loss-of-function confirmed in family; structural reasoning supported by known disulfide bond architecture","pmids":["15099344"],"is_preprint":false},{"year":2007,"finding":"The HAMP gene promoter contains functional regulatory elements including a STAT site (nt -148 to -130) important for basal level expression in humans, and AP-1, E-box, and TIEG motifs do not play a critical role in IL-6 or BMP-9 induced responses in murine Hamp1; the human HAMP STAT site is important for both basal and IL-6-inducible promoter activity.","method":"Luciferase reporter assays with promoter mutagenesis; comparison of human HAMP vs. murine Hamp1/Hamp2 promoter constructs in reporter gene assays","journal":"Blood cells, molecules & diseases","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — direct promoter mutagenesis with reporter assays; single lab but multiple constructs tested","pmids":["17689119"],"is_preprint":false},{"year":2009,"finding":"Genetic epistasis in mice lacking both hemojuvelin (HFE2) and matriptase-2 (TMPRSS6) shows low Hamp expression and iron overload, demonstrating that hemojuvelin is a major substrate for matriptase-2 in activating Hamp expression, and that the two pathways converge on hepcidin regulation.","method":"Double knockout mouse generation; Hamp expression measurement; serum and liver iron quantification","journal":"British journal of haematology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis in vivo with double-KO mice; multiple iron parameters measured; mechanistic pathway placement established","pmids":["19751239"],"is_preprint":false},{"year":2010,"finding":"Severe iron deficiency blunts the hepatic Hamp/hepcidin transcriptional response to lipopolysaccharide-induced inflammation, and also reduces IL-6 and TNF-α production, suggesting iron is required for a full acute-phase hepcidin response; iron chelation in HuH7 cells blunts hepcidin response to IL-6 directly.","method":"Animal dietary model (iron-deficient rats + LPS); qRT-PCR for Hamp and cytokine mRNAs; ELISA for serum cytokines; cell culture experiments with iron chelators","journal":"Haematologica","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (in vivo + in vitro); single lab; both animal and cell culture corroboration","pmids":["20511664"],"is_preprint":false},{"year":2011,"finding":"GATA-4 and GATA-6 transcription factors bind to a GATA regulatory element (-TTATCT- at positions -103/-98) in the HAMP promoter and transactivate hepcidin expression in hepatocytes; FOG (Friend of GATA) proteins 1 and 2 suppress this GATA-mediated transactivation of HAMP.","method":"HAMP promoter 5'-deletion analysis; site-directed mutagenesis of GATA-RE; luciferase reporter assays in Huh7 cells; EMSA/ChIP for GATA protein binding","journal":"Journal of molecular endocrinology","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — direct promoter mutagenesis plus binding assays; single lab with multiple orthogonal methods","pmids":["21971825"],"is_preprint":false},{"year":2012,"finding":"In Hamp knockout mice fed an iron-deficient diet, ferroportin protein expression increases in duodenum and spleen while decreasing in liver, and Dcytb and DMT1 mRNAs are more strongly induced than in controls, demonstrating that hepcidin regulates iron transport machinery (ferroportin, DMT1, Dcytb) and that hepcidin-independent mechanisms can partially compensate for iron homeostasis.","method":"Hamp-/- mouse model; dietary iron restriction; qPCR for iron-related gene mRNAs; Western blot for protein expression","journal":"European journal of nutrition","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — knockout model with direct measurement of downstream iron transport proteins; single lab, multiple methods","pmids":["22241739"],"is_preprint":false},{"year":2012,"finding":"A novel HAMP mutation p.R75X (homozygous) abolishes detectable hepcidin protein in serum and urine (by LC-MS/MS), directly linking this premature stop codon to complete absence of hepcidin and consequent juvenile hemochromatosis.","method":"Direct HAMP gene sequencing; LC-MS/MS protein detection in serum and urine","journal":"Blood cells, molecules & diseases","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct protein detection by LC-MS/MS confirms loss of hepcidin protein; single patient but rigorous protein-level confirmation","pmids":["22297252"],"is_preprint":false},{"year":2013,"finding":"ATOH8 transcription factor activates HAMP transcription by directly binding to E-box regions in the HAMP promoter (confirmed by ChIP) and also indirectly through BMP signaling (increased pSMAD1,5,8); liver Atoh8 levels are reduced by conditions increasing erythropoietic activity (hypoxia, hemolytic anemia, EPO treatment) and increased by holo-transferrin, positioning ATOH8 as a novel iron- and erythropoiesis-responsive transcriptional regulator of HAMP.","method":"ChIP assay for ATOH8 binding to HAMP promoter E-box; HAMP promoter activity reporter assay; promoter mutation analysis; pSMAD1,5,8 measurement; in vivo mouse models (hypoxia, phlebotomy, EPO)","journal":"British journal of haematology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — direct ChIP evidence for promoter binding plus promoter reporter assays with mutagenesis plus in vivo corroboration; multiple orthogonal methods in single study","pmids":["24236640"],"is_preprint":false},{"year":2013,"finding":"Prohepcidin (the HAMP precursor) localizes to the nucleus of hepatocytes and specifically binds the STAT3 site in the HAMP promoter, reducing HAMP promoter activity when overexpressed; decreasing prohepcidin increases promoter activity; binding partner α-1 antitrypsin competes with this autoregulatory function, suggesting a novel negative autoregulatory feedback loop.","method":"Indirect immunofluorescence and mCherry tagging (subcellular localization); DNA-binding assay (STAT3 site); luciferase reporter assays with prohepcidin overexpression/knockdown in WRL68 cells","journal":"The Biochemical journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct nuclear localization plus functional promoter assay with gain- and loss-of-function; single lab with two orthogonal methods","pmids":["23390933"],"is_preprint":false},{"year":2015,"finding":"Saturated fatty acids (palmitic acid, stearic acid) upregulate HAMP mRNA through post-transcriptional stabilization via the 3'-UTR AU-rich element (ARE), not through promoter activation; the ARE-binding protein HuR is required, as its siRNA knockdown abolishes the effect; PKC-mediated phosphorylation drives HuR nucleo-cytoplasmic shuttling and binding to HAMP mRNA.","method":"RT-PCR; actinomycin D transcription block; 3'-UTR reporter assays; ARE mutagenesis; HuR siRNA knockdown; PKC inhibitors; HuR-HAMP mRNA binding assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstituted post-transcriptional mechanism with multiple orthogonal methods (reporter assays, ARE mutagenesis, siRNA, kinase inhibitors, direct binding assay) in single study","pmids":["26304124"],"is_preprint":false},{"year":2010,"finding":"The HAMP c.-582A>G promoter variant decreases transcriptional activity by 20% in HepG2 cells when co-transfected with USF1 and by 12-14% with USF2, identifying USF transcription factors as regulators of HAMP promoter activity through this element.","method":"Luciferase reporter assay with HAMP promoter variants co-transfected with USF1/USF2 expression plasmids","journal":"BMC genetics","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — direct promoter reporter assay with defined transcription factors; single lab, single method","pmids":["21143959"],"is_preprint":false},{"year":2019,"finding":"GDF11 suppresses hepatic HAMP expression in vivo and in vitro by decreasing BMP-SMAD signaling, enhancing SMAD ubiquitin regulatory factor 1 (SMURF1) expression, and activating ERK1/2 signaling; ERK1/2 activation is required for GDF11/SMURF1-mediated BMP-SMAD suppression and HAMP inhibition.","method":"Exogenous GDF11 administration in mice and hepatocyte cultures; SMAD phosphorylation measurement; SMURF1 expression; ERK1/2 inhibition experiments; phlebotomy and EPO mouse models","journal":"British journal of haematology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo and in vitro corroboration with pathway inhibition experiments; single lab with multiple methods","pmids":["31418854"],"is_preprint":false},{"year":2019,"finding":"Downregulation of HAMP (hepcidin) in hepatocellular carcinoma cells promotes proliferation and migration through activation of the CDK1/STAT3 pathway, as confirmed by Western blotting showing that reduced HAMP activates CDK1/STAT3 signaling.","method":"HAMP knockdown/overexpression in SMMC-7721 and HepG2 cells; EdU proliferation assay; Transwell migration assay; flow cytometry; Western blot for CDK1/STAT3; GSEA","journal":"Diagnostics","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab; pathway placement based on Western blot correlation only; no direct mechanistic link between HAMP and CDK1/STAT3 established","pmids":["31052210"],"is_preprint":false},{"year":2018,"finding":"HDAC3 modulates binding of transcription factors C/EBPα, HIF1α, and STAT3 to the LEAP-1/HAMP promoter, and HDAC3 inhibition upregulates HAMP (LEAP-1) expression in hepatocytes, identifying an epigenetic mechanism controlling hepcidin transcription.","method":"ChIP assay for transcription factor binding to HAMP promoter; microarray and qRT-PCR; HDAC3 inhibitor treatment in Huh7 cells and mouse model","journal":"Virologica Sinica","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — direct ChIP evidence for transcription factor recruitment plus functional inhibitor experiments; single lab, two orthogonal methods","pmids":["30328580"],"is_preprint":false},{"year":2021,"finding":"In Hamp knockout mice (model of type 2B hereditary hemochromatosis), oral delivery of Dmt1 siRNA combined with dietary iron restriction suppressed duodenal Dmt1 mRNA by ~50% and reduced serum and liver non-heme iron by ~60% and >85%, demonstrating that DMT1 upregulation is a functional consequence of hepcidin deficiency and that silencing DMT1 can correct iron overload caused by HAMP loss.","method":"Hamp KO mouse model; oral siRNA delivery via ginger-derived lipid nanoparticles; qPCR for Dmt1; serum and liver iron measurement; 59Fe absorption assay","journal":"Nutrients","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo KO model with direct molecular intervention; multiple iron parameters measured; single lab","pmids":["34063414"],"is_preprint":false},{"year":2011,"finding":"HIF-1α stabilization (via PHD inhibition by EGCG) induces Hamp expression in rat kidney, establishing that HIF-1α can positively regulate hepcidin transcription in the kidney (in contrast to its role in the liver where it represses hepcidin).","method":"In vivo EGCG dosing in rats; HIF-1α stabilization confirmed by Western blot; PHD inhibition assay; Hamp qPCR; in vitro Hep3B cell assay with EGCG","journal":"Biochemical and biophysical research communications","confidence":"Low","confidence_rationale":"Tier 3 / Weak — in vivo and in vitro data but indirect mechanism (drug effect on PHD/HIF with downstream Hamp as readout); single lab, limited mechanistic dissection","pmids":["22138393"],"is_preprint":false},{"year":2019,"finding":"DNA methylation of the Hamp promoter region is significantly elevated after Roux-en-Y gastric bypass surgery in rats, correlating with decreased Hamp mRNA and HEPCIDIN-25 protein, establishing that promoter methylation suppresses Hamp expression in response to post-surgical iron deficiency.","method":"RNA-seq; qPCR; ELISA for hepcidin-25; MassARRAY EpiTYPER DNA methylation quantification at Hamp promoter CpG sites","journal":"Surgery for obesity and related diseases","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct methylation quantification at defined CpGs correlated with expression and protein changes; in vivo model; single lab","pmids":["31839527"],"is_preprint":false},{"year":2018,"finding":"HAMP promoter hypomethylation (at CpG sites cg23677000 and cg04085447) upregulates hepcidin expression in Kawasaki disease patients; IVIG treatment restores methylation; luciferase reporter assays confirmed that methylation of these target CpG sites decreases HAMP gene expression.","method":"Illumina HumanMethylation450 BeadChip; pyrosequencing for validation; luciferase reporter assay with methylated/unmethylated constructs; ELISA for plasma hepcidin","journal":"Journal of molecular and cellular cardiology","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — direct functional reporter assay confirms methylation effect on promoter activity; large clinical cohort validation; single lab","pmids":["29501389"],"is_preprint":false},{"year":2013,"finding":"The extract of Caulis Spatholobi inhibits HAMP expression in Huh7 cells by reducing phosphorylated SMAD1/5/8 levels (by 80%), with stronger inhibition of BMP6-induced than IL-6-induced HAMP expression; in vivo in mice it decreases hepatic HAMP expression by 60% and reduces hepatic iron concentration.","method":"Cell-based HAMP expression assay; pSMAD1/5/8 Western blot; BMP6 and IL-6 stimulation; in vivo mouse feeding experiment with hepatic HAMP qPCR and iron measurement","journal":"The Journal of nutrition","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pathway placement via pSMAD measurement in vitro and in vivo; single lab, multiple methods","pmids":["23700338"],"is_preprint":false}],"current_model":"HAMP encodes hepcidin, a liver-derived 25-residue antimicrobial peptide with four disulfide bonds that functions as the master hormonal regulator of systemic iron homeostasis by controlling ferroportin-mediated iron export from enterocytes and macrophages; its transcription is activated by BMP-SMAD signaling (modulated by hemojuvelin/matriptase-2), IL-6/STAT3, ATOH8, and GATA4/6 transcription factors, and is post-transcriptionally stabilized by PKC-dependent HuR binding to a 3'-UTR ARE element in response to saturated fatty acids; promoter DNA methylation suppresses HAMP expression under iron-deficient or post-surgical conditions; loss-of-function mutations (including disulfide-disrupting cysteine substitutions, frameshifts, premature stops, and 5'-UTR upstream-AUG mutations) abolish hepcidin protein and cause juvenile or adult-onset hereditary hemochromatosis, with severity modulated by digenic inheritance with HFE mutations."},"narrative":{"mechanistic_narrative":"HAMP encodes hepcidin, a 25-residue, four-disulfide-bonded peptide isolated from human blood ultrafiltrate that displays direct antimicrobial activity and is expressed predominantly in liver [PMID:11034317]. Beyond this innate-immune role, hepcidin is the central effector controlling systemic iron distribution: in hepcidin-deficient mice, ferroportin protein rises in duodenum and spleen while the iron-import machinery DMT1 and Dcytb are hyperinduced, and silencing duodenal Dmt1 corrects the resulting iron overload, establishing that hepcidin restrains dietary iron absorption by acting on these iron-transport proteins [PMID:22241739, PMID:34063414]. HAMP transcription integrates multiple inputs converging on hepatocyte promoter elements: the BMP-SMAD axis, in which hemojuvelin serves as a major matriptase-2 (TMPRSS6) substrate driving Hamp expression [PMID:19751239] and which is suppressed by GDF11 through SMURF1/ERK1/2-mediated reduction of phospho-SMAD1/5/8 [PMID:31418854]; a STAT site mediating basal and IL-6-inducible activity [PMID:17689119]; and dedicated transcription factors including GATA-4/6 (antagonized by FOG proteins) [PMID:21971825] and the iron- and erythropoiesis-responsive ATOH8, which acts both through promoter E-boxes and through BMP signaling [PMID:24236640]. Hepcidin output is further tuned post-transcriptionally—saturated fatty acids stabilize HAMP mRNA via a 3'-UTR AU-rich element bound by PKC-activated HuR [PMID:26304124]—and epigenetically through promoter DNA methylation, which suppresses expression in iron-deficient and post-surgical states [PMID:31839527, PMID:29501389]. Loss-of-function HAMP mutations—including cysteine substitutions that disrupt disulfide bonds, premature stop codons, frameshifts, and a 5'-UTR upstream-AUG mutation—abolish detectable hepcidin protein and cause juvenile hemochromatosis, while heterozygous variants co-inherited with HFE C282Y produce digenic adult-onset iron overload [PMID:12915468, PMID:15198949, PMID:15024747, PMID:22297252].","teleology":[{"year":2000,"claim":"Established the molecular identity of HAMP's product—a disulfide-rich peptide with antimicrobial activity—before its iron-regulatory role was known, defining the protein at the biochemical level.","evidence":"Mass-spectrometric isolation from human blood ultrafiltrate and radial diffusion antimicrobial assays with synthetic peptide","pmids":["11034317"],"confidence":"High","gaps":["Did not connect the peptide to iron homeostasis","Physiological relevance of antimicrobial activity versus hormonal function not resolved"]},{"year":2003,"claim":"Answered whether HAMP variation contributes to human iron-overload disease by showing HAMP mutations act as digenic modifiers of HFE-associated hemochromatosis.","evidence":"Sequencing of HAMP in hemochromatosis families and cohorts with genotype-phenotype correlation against population controls","pmids":["12915468","14670915"],"confidence":"Medium","gaps":["Did not establish hepcidin protein levels in carriers","Mechanism by which heterozygous loss synergizes with HFE not dissected"]},{"year":2004,"claim":"Linked specific structural and regulatory HAMP lesions to absent hepcidin protein, demonstrating that disulfide integrity and correct translation initiation are required for a functional hormone.","evidence":"Sequencing of disulfide-disrupting cysteine mutations and a 5'-UTR upstream-AUG mutation, with hepcidin protein assays in urine and clinical phenotyping in juvenile hemochromatosis families","pmids":["15198949","15024747","15099344"],"confidence":"Medium","gaps":["No structural model of the disulfide-bonded active conformation provided","Quantitative relationship between residual hepcidin and disease severity not defined"]},{"year":2007,"claim":"Mapped the functional cis-elements of the HAMP promoter, identifying a STAT site as critical for basal and IL-6-inducible transcription.","evidence":"Luciferase reporter assays with promoter mutagenesis comparing human HAMP and murine Hamp constructs","pmids":["17689119"],"confidence":"Medium","gaps":["Did not identify the full set of trans-acting factors at the STAT site","Species differences in promoter architecture left unresolved"]},{"year":2009,"claim":"Placed HAMP regulation within a defined upstream pathway by establishing hemojuvelin as a major matriptase-2 substrate controlling Hamp expression.","evidence":"Hfe2/Tmprss6 double-knockout mice with Hamp expression and serum/liver iron quantification","pmids":["19751239"],"confidence":"High","gaps":["Did not resolve the direct biochemical cleavage event on hemojuvelin","How the pathway scales hepcidin output to iron load not quantified"]},{"year":2011,"claim":"Expanded the transcription-factor repertoire controlling HAMP by identifying GATA-4/6 activation (suppressed by FOG) and USF binding at promoter elements.","evidence":"Promoter deletion/mutagenesis, luciferase reporters, EMSA/ChIP in Huh7 cells; USF1/2 co-transfection reporter assays in HepG2","pmids":["21971825","21143959"],"confidence":"Medium","gaps":["Physiological signals upstream of GATA/USF engagement not defined","Relative contribution versus BMP-SMAD and STAT inputs unquantified"]},{"year":2012,"claim":"Demonstrated the downstream consequence of hepcidin loss—dysregulation of the iron-transport machinery—and showed partial hepcidin-independent compensation.","evidence":"Hamp-/- mice on iron-deficient diet with qPCR and Western blot for ferroportin, DMT1, Dcytb; LC-MS/MS confirmation of absent hepcidin in a p.R75X patient","pmids":["22241739","22297252"],"confidence":"Medium","gaps":["Nature of hepcidin-independent compensatory mechanisms not identified","Single-patient protein confirmation for the nonsense mutation"]},{"year":2013,"claim":"Connected erythropoietic and iron status to HAMP transcription through ATOH8, and proposed a nuclear autoregulatory role for prohepcidin at the STAT3 promoter site.","evidence":"ChIP, promoter reporter/mutagenesis and in vivo hypoxia/EPO models for ATOH8; immunofluorescence localization and reporter gain/loss-of-function for prohepcidin in WRL68 cells; Caulis Spatholobi pSMAD experiments","pmids":["24236640","23390933","23700338"],"confidence":"Medium","gaps":["Prohepcidin nuclear autoregulation rests on a single lab without reciprocal validation","Physiological extent of prohepcidin feedback in vivo unknown"]},{"year":2015,"claim":"Established that HAMP is regulated post-transcriptionally, defining a saturated-fatty-acid-responsive HuR/ARE mRNA-stabilization mechanism distinct from promoter control.","evidence":"Actinomycin D chase, 3'-UTR ARE reporter and mutagenesis, HuR siRNA, PKC inhibitors and HuR-HAMP mRNA binding assays","pmids":["26304124"],"confidence":"High","gaps":["In vivo relevance of fatty-acid-driven stabilization to systemic iron not established","Interplay with transcriptional inputs not integrated"]},{"year":2019,"claim":"Added epigenetic and growth-factor layers to HAMP control: HDAC3-dependent transcription-factor recruitment, GDF11-driven BMP-SMAD suppression, and promoter methylation responsive to systemic iron state.","evidence":"ChIP and HDAC3 inhibition; GDF11 administration with SMAD/SMURF1/ERK1/2 dissection in mice and hepatocytes; MassARRAY methylation and reporter assays in surgical and Kawasaki-disease models","pmids":["30328580","31418854","31839527","29501389"],"confidence":"Medium","gaps":["How these layers are coordinated with canonical BMP/STAT signaling unresolved","Causal hierarchy among methylation, HDAC3, and transcription factors not ordered"]},{"year":2021,"claim":"Validated DMT1 as a therapeutically actionable downstream node of hepcidin deficiency, showing its silencing corrects HAMP-loss iron overload.","evidence":"Oral Dmt1 siRNA via lipid nanoparticles plus dietary iron restriction in Hamp-KO mice with 59Fe absorption and iron measurements","pmids":["34063414"],"confidence":"Medium","gaps":["Long-term efficacy and ferroportin-axis effects not assessed","Generalizability to human HAMP-related hemochromatosis untested"]},{"year":null,"claim":"How the diverse transcriptional (BMP-SMAD, STAT, GATA, ATOH8, USF, HDAC3), post-transcriptional (HuR/ARE), and epigenetic (DNA methylation) inputs are quantitatively integrated to set hepcidin output—and the structural basis of the disulfide-bonded active peptide—remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model weighting the relative inputs to HAMP transcription","No experimental structure of the mature peptide bound to ferroportin","Tissue-specific regulation (e.g. kidney HIF-1α) not integrated with hepatic control"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0090729","term_label":"toxin activity","supporting_discovery_ids":[0]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[10,19]}],"localization":[{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[0]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[13]}],"pathway":[{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[10,19]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[0]}],"complexes":[],"partners":["FPN1","TMPRSS6","HJV","GATA4","GATA6","ATOH8","ELAVL1","SERPINA1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P81172","full_name":"Hepcidin","aliases":["Liver-expressed antimicrobial peptide 1","LEAP-1","Putative liver tumor regressor","PLTR"],"length_aa":84,"mass_kda":9.4,"function":"Liver-produced hormone that constitutes the main circulating regulator of iron absorption and distribution across tissues. Acts by promoting endocytosis and degradation of ferroportin/SLC40A1, leading to the retention of iron in iron-exporting cells and decreased flow of iron into plasma (PubMed:22682227, PubMed:29237594, PubMed:32814342). Controls the major flows of iron into plasma: absorption of dietary iron in the intestine, recycling of iron by macrophages, which phagocytose old erythrocytes and other cells, and mobilization of stored iron from hepatocytes (PubMed:22306005) Has strong antimicrobial activity against E.coli ML35P N.cinerea and weaker against S.epidermidis, S.aureus and group b streptococcus bacteria. Active against the fungus C.albicans. No activity against P.aeruginosa (PubMed:11034317, PubMed:11113131)","subcellular_location":"Secreted","url":"https://www.uniprot.org/uniprotkb/P81172/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/HAMP","classification":"Not Classified","n_dependent_lines":469,"n_total_lines":1208,"dependency_fraction":0.3882450331125828},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/HAMP","total_profiled":1310},"omim":[{"mim_id":"620121","title":"IRON OVERLOAD, SUSCEPTIBILITY TO; IO","url":"https://www.omim.org/entry/620121"},{"mim_id":"615099","title":"ERYTHROFERRONE; ERFE","url":"https://www.omim.org/entry/615099"},{"mim_id":"614193","title":"TRANSFERRIN SERUM LEVEL QUANTITATIVE TRAIT LOCUS 2; TFQTL2","url":"https://www.omim.org/entry/614193"},{"mim_id":"613609","title":"HOMEOSTATIC IRON REGULATOR; HFE","url":"https://www.omim.org/entry/613609"},{"mim_id":"613313","title":"HEMOCHROMATOSIS, TYPE 2B; HFE2B","url":"https://www.omim.org/entry/613313"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in 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bacteriology","url":"https://pubmed.ncbi.nlm.nih.gov/15317802","citation_count":13,"is_preprint":false},{"pmid":"37429525","id":"PMC_37429525","title":"Differences in DNA methylation of HAMP in blood cells predicts the development of type 2 diabetes.","date":"2023","source":"Molecular metabolism","url":"https://pubmed.ncbi.nlm.nih.gov/37429525","citation_count":12,"is_preprint":false},{"pmid":"38010737","id":"PMC_38010737","title":"AlphaFold2 captures the conformational landscape of the HAMP signaling domain.","date":"2024","source":"Protein science : a publication of the Protein Society","url":"https://pubmed.ncbi.nlm.nih.gov/38010737","citation_count":11,"is_preprint":false},{"pmid":"21162553","id":"PMC_21162553","title":"Role of the HAMP domain region of sensory rhodopsin transducers in signal transduction.","date":"2010","source":"Biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/21162553","citation_count":11,"is_preprint":false},{"pmid":"26657037","id":"PMC_26657037","title":"Functional dissection of HAMP domains in NIK1 ortholog from pathogenic yeast Candida lusitaniae.","date":"2015","source":"Gene","url":"https://pubmed.ncbi.nlm.nih.gov/26657037","citation_count":11,"is_preprint":false},{"pmid":"21971825","id":"PMC_21971825","title":"Friend of GATA suppresses the GATA-induced transcription of hepcidin in hepatocytes through a GATA-regulatory element in the HAMP promoter.","date":"2011","source":"Journal of molecular endocrinology","url":"https://pubmed.ncbi.nlm.nih.gov/21971825","citation_count":11,"is_preprint":false},{"pmid":"21763270","id":"PMC_21763270","title":"Structural characterization of AS1-membrane interactions from a subset of HAMP domains.","date":"2011","source":"Biochimica et biophysica acta","url":"https://pubmed.ncbi.nlm.nih.gov/21763270","citation_count":11,"is_preprint":false},{"pmid":"18199454","id":"PMC_18199454","title":"Signal transmission through the HtrII transducer alters the interaction of two alpha-helices in the HAMP domain.","date":"2007","source":"Journal of molecular biology","url":"https://pubmed.ncbi.nlm.nih.gov/18199454","citation_count":11,"is_preprint":false},{"pmid":"40167256","id":"PMC_40167256","title":"An Insect Salivary Sheath Protein Triggers Plant Resistance to Insects and Pathogens as a Conserved HAMP.","date":"2025","source":"Advanced science (Weinheim, Baden-Wurttemberg, Germany)","url":"https://pubmed.ncbi.nlm.nih.gov/40167256","citation_count":10,"is_preprint":false},{"pmid":"36849046","id":"PMC_36849046","title":"Growth-promoting effect of antimicrobial peptide Scy-hepc on mariculture large yellow croaker Larimichthys crocea and the underlying mechanism.","date":"2023","source":"Fish & shellfish immunology","url":"https://pubmed.ncbi.nlm.nih.gov/36849046","citation_count":10,"is_preprint":false},{"pmid":"31608136","id":"PMC_31608136","title":"Hyaluronan activated-metabolism phenotype (HAMP) in pancreatic ductal adenocarcinoma.","date":"2019","source":"Oncotarget","url":"https://pubmed.ncbi.nlm.nih.gov/31608136","citation_count":10,"is_preprint":false},{"pmid":"28881695","id":"PMC_28881695","title":"Correlation of HAMP gene polymorphisms and expression with the susceptibility and length of hospital stays in Taiwanese children with Kawasaki disease.","date":"2017","source":"Oncotarget","url":"https://pubmed.ncbi.nlm.nih.gov/28881695","citation_count":10,"is_preprint":false},{"pmid":"28527583","id":"PMC_28527583","title":"Molecular characterization of Aspergillus fumigatus TcsC, a characteristic type III hybrid histidine kinase of filamentous fungi harboring six HAMP domains.","date":"2017","source":"International journal of medical microbiology : IJMM","url":"https://pubmed.ncbi.nlm.nih.gov/28527583","citation_count":10,"is_preprint":false},{"pmid":"31839527","id":"PMC_31839527","title":"DNA methylation suppresses liver Hamp expression in response to iron deficiency after bariatric surgery.","date":"2019","source":"Surgery for obesity and related diseases : official journal of the American Society for Bariatric Surgery","url":"https://pubmed.ncbi.nlm.nih.gov/31839527","citation_count":9,"is_preprint":false},{"pmid":"22138393","id":"PMC_22138393","title":"Inactivation of prolyl hydroxylase domain (PHD) protein by epigallocatechin (EGCG) stabilizes hypoxia-inducible factor (HIF-1α) and induces hepcidin (Hamp) in rat kidney.","date":"2011","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/22138393","citation_count":8,"is_preprint":false},{"pmid":"26782599","id":"PMC_26782599","title":"A Novel Isoform of the Hepatic Antimicrobial Peptide, Hepcidin (Hepc-CB1), from a Deep-Sea Fish, the Spinyjaw Greeneye Chlorophthalmus bicornis (Norman, 1939): Molecular Characterisation and Phylogeny.","date":"2013","source":"Probiotics and antimicrobial proteins","url":"https://pubmed.ncbi.nlm.nih.gov/26782599","citation_count":8,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":49988,"output_tokens":6079,"usd":0.120575,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":14836,"output_tokens":4096,"usd":0.08829,"stage2_stop_reason":"end_turn"},"total_usd":0.208865,"stage1_batch_id":"msgbatch_01DUPACZi7AAWwuZiUjseQF4","stage2_batch_id":"msgbatch_018yt7chE3f48PEFtDwtj6AE","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2000,\n      \"finding\": \"HAMP/LEAP-1 (hepcidin) is a 25-residue peptide containing four disulfide bonds (novel disulfide motif) isolated from human blood ultrafiltrate, with antimicrobial activity against Gram-positive bacteria (Bacillus megaterium, B. subtilis, Micrococcus luteus, Staphylococcus carnosus), Gram-negative Neisseria cinerea, and yeast Saccharomyces cerevisiae in radial diffusion assays; expression is predominantly hepatic.\",\n      \"method\": \"Mass spectrometric isolation from blood ultrafiltrate; radial diffusion antimicrobial assay with synthetic peptide; expression analysis\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct biochemical isolation, structural characterization (disulfide bonds), and functional antimicrobial assay with synthetic peptide; foundational discovery paper\",\n      \"pmids\": [\"11034317\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Heterozygous loss-of-function mutations in HAMP (frameshift Met50del IVS2+1(-G) and missense G71D) co-inherited with HFE C282Y mutation cause digenic hereditary hemochromatosis with iron overload severity corresponding to HAMP mutation severity, establishing HAMP as a modifier of HFE-associated iron homeostasis.\",\n      \"method\": \"Genetic sequencing of HAMP in hemochromatosis families; genotype-phenotype correlation; control chromosome analysis\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis in human families with direct sequencing, replicated across two families; mechanistic inference from loss-of-function mutations\",\n      \"pmids\": [\"12915468\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Heterozygous HAMP mutations (pR59G, pG71D, pR56X) increase phenotypic iron overload expression in HFE pC282Y/pC282Y homozygous patients, and heterozygous mutations in both HFE and HAMP can lead to adult-onset iron overload in a digenic inheritance model.\",\n      \"method\": \"Cohort sequencing; iron indices comparison; population control analysis\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis confirmed across a cohort of 392 patients with matched controls; single lab but large sample\",\n      \"pmids\": [\"14670915\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"A mutation in the 5'-UTR of HAMP creates a new upstream initiation codon in a Kozak context, causing ribosomes to select the mutant codon for translation, resulting in non-detectable hepcidin protein in urine and juvenile hemochromatosis; this directly links translational regulation to hepcidin production and iron overload.\",\n      \"method\": \"Sequencing of HAMP 5'-UTR; hepcidin protein detection in urine; clinical phenotyping; phlebotomy response\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct mutation identification with functional consequence (absent protein product) demonstrated by protein assay in two family members\",\n      \"pmids\": [\"15198949\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"The HAMP mutation C78T (p.C78T/C70R in mature peptide) disrupts one of the four intramolecular disulfide bonds present in hepcidin, supporting that these conserved cysteines are critical for hepcidin structure and function, with loss causing severe hereditary hemochromatosis.\",\n      \"method\": \"HAMP gene sequencing; structural analysis of conserved cysteines; clinical phenotype characterization\",\n      \"journal\": \"Human mutation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mutation disrupts known disulfide bond; functional consequence (severe HH) confirmed in patient; structural inference supported by sequence conservation across vertebrates\",\n      \"pmids\": [\"15024747\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Homozygosity for HAMP mutation C78T (p.C78T), which disrupts a conserved cysteine critical for disulfide bonding, causes juvenile hemochromatosis in a consanguineous family, confirming that the conserved cysteines are required for active hepcidin function.\",\n      \"method\": \"Direct sequencing of HAMP; clinical phenotype assessment in consanguineous family\",\n      \"journal\": \"Clinical genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — homozygous loss-of-function confirmed in family; structural reasoning supported by known disulfide bond architecture\",\n      \"pmids\": [\"15099344\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"The HAMP gene promoter contains functional regulatory elements including a STAT site (nt -148 to -130) important for basal level expression in humans, and AP-1, E-box, and TIEG motifs do not play a critical role in IL-6 or BMP-9 induced responses in murine Hamp1; the human HAMP STAT site is important for both basal and IL-6-inducible promoter activity.\",\n      \"method\": \"Luciferase reporter assays with promoter mutagenesis; comparison of human HAMP vs. murine Hamp1/Hamp2 promoter constructs in reporter gene assays\",\n      \"journal\": \"Blood cells, molecules & diseases\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct promoter mutagenesis with reporter assays; single lab but multiple constructs tested\",\n      \"pmids\": [\"17689119\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Genetic epistasis in mice lacking both hemojuvelin (HFE2) and matriptase-2 (TMPRSS6) shows low Hamp expression and iron overload, demonstrating that hemojuvelin is a major substrate for matriptase-2 in activating Hamp expression, and that the two pathways converge on hepcidin regulation.\",\n      \"method\": \"Double knockout mouse generation; Hamp expression measurement; serum and liver iron quantification\",\n      \"journal\": \"British journal of haematology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis in vivo with double-KO mice; multiple iron parameters measured; mechanistic pathway placement established\",\n      \"pmids\": [\"19751239\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Severe iron deficiency blunts the hepatic Hamp/hepcidin transcriptional response to lipopolysaccharide-induced inflammation, and also reduces IL-6 and TNF-α production, suggesting iron is required for a full acute-phase hepcidin response; iron chelation in HuH7 cells blunts hepcidin response to IL-6 directly.\",\n      \"method\": \"Animal dietary model (iron-deficient rats + LPS); qRT-PCR for Hamp and cytokine mRNAs; ELISA for serum cytokines; cell culture experiments with iron chelators\",\n      \"journal\": \"Haematologica\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (in vivo + in vitro); single lab; both animal and cell culture corroboration\",\n      \"pmids\": [\"20511664\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"GATA-4 and GATA-6 transcription factors bind to a GATA regulatory element (-TTATCT- at positions -103/-98) in the HAMP promoter and transactivate hepcidin expression in hepatocytes; FOG (Friend of GATA) proteins 1 and 2 suppress this GATA-mediated transactivation of HAMP.\",\n      \"method\": \"HAMP promoter 5'-deletion analysis; site-directed mutagenesis of GATA-RE; luciferase reporter assays in Huh7 cells; EMSA/ChIP for GATA protein binding\",\n      \"journal\": \"Journal of molecular endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct promoter mutagenesis plus binding assays; single lab with multiple orthogonal methods\",\n      \"pmids\": [\"21971825\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"In Hamp knockout mice fed an iron-deficient diet, ferroportin protein expression increases in duodenum and spleen while decreasing in liver, and Dcytb and DMT1 mRNAs are more strongly induced than in controls, demonstrating that hepcidin regulates iron transport machinery (ferroportin, DMT1, Dcytb) and that hepcidin-independent mechanisms can partially compensate for iron homeostasis.\",\n      \"method\": \"Hamp-/- mouse model; dietary iron restriction; qPCR for iron-related gene mRNAs; Western blot for protein expression\",\n      \"journal\": \"European journal of nutrition\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — knockout model with direct measurement of downstream iron transport proteins; single lab, multiple methods\",\n      \"pmids\": [\"22241739\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"A novel HAMP mutation p.R75X (homozygous) abolishes detectable hepcidin protein in serum and urine (by LC-MS/MS), directly linking this premature stop codon to complete absence of hepcidin and consequent juvenile hemochromatosis.\",\n      \"method\": \"Direct HAMP gene sequencing; LC-MS/MS protein detection in serum and urine\",\n      \"journal\": \"Blood cells, molecules & diseases\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct protein detection by LC-MS/MS confirms loss of hepcidin protein; single patient but rigorous protein-level confirmation\",\n      \"pmids\": [\"22297252\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"ATOH8 transcription factor activates HAMP transcription by directly binding to E-box regions in the HAMP promoter (confirmed by ChIP) and also indirectly through BMP signaling (increased pSMAD1,5,8); liver Atoh8 levels are reduced by conditions increasing erythropoietic activity (hypoxia, hemolytic anemia, EPO treatment) and increased by holo-transferrin, positioning ATOH8 as a novel iron- and erythropoiesis-responsive transcriptional regulator of HAMP.\",\n      \"method\": \"ChIP assay for ATOH8 binding to HAMP promoter E-box; HAMP promoter activity reporter assay; promoter mutation analysis; pSMAD1,5,8 measurement; in vivo mouse models (hypoxia, phlebotomy, EPO)\",\n      \"journal\": \"British journal of haematology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct ChIP evidence for promoter binding plus promoter reporter assays with mutagenesis plus in vivo corroboration; multiple orthogonal methods in single study\",\n      \"pmids\": [\"24236640\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Prohepcidin (the HAMP precursor) localizes to the nucleus of hepatocytes and specifically binds the STAT3 site in the HAMP promoter, reducing HAMP promoter activity when overexpressed; decreasing prohepcidin increases promoter activity; binding partner α-1 antitrypsin competes with this autoregulatory function, suggesting a novel negative autoregulatory feedback loop.\",\n      \"method\": \"Indirect immunofluorescence and mCherry tagging (subcellular localization); DNA-binding assay (STAT3 site); luciferase reporter assays with prohepcidin overexpression/knockdown in WRL68 cells\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct nuclear localization plus functional promoter assay with gain- and loss-of-function; single lab with two orthogonal methods\",\n      \"pmids\": [\"23390933\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Saturated fatty acids (palmitic acid, stearic acid) upregulate HAMP mRNA through post-transcriptional stabilization via the 3'-UTR AU-rich element (ARE), not through promoter activation; the ARE-binding protein HuR is required, as its siRNA knockdown abolishes the effect; PKC-mediated phosphorylation drives HuR nucleo-cytoplasmic shuttling and binding to HAMP mRNA.\",\n      \"method\": \"RT-PCR; actinomycin D transcription block; 3'-UTR reporter assays; ARE mutagenesis; HuR siRNA knockdown; PKC inhibitors; HuR-HAMP mRNA binding assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstituted post-transcriptional mechanism with multiple orthogonal methods (reporter assays, ARE mutagenesis, siRNA, kinase inhibitors, direct binding assay) in single study\",\n      \"pmids\": [\"26304124\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"The HAMP c.-582A>G promoter variant decreases transcriptional activity by 20% in HepG2 cells when co-transfected with USF1 and by 12-14% with USF2, identifying USF transcription factors as regulators of HAMP promoter activity through this element.\",\n      \"method\": \"Luciferase reporter assay with HAMP promoter variants co-transfected with USF1/USF2 expression plasmids\",\n      \"journal\": \"BMC genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — direct promoter reporter assay with defined transcription factors; single lab, single method\",\n      \"pmids\": [\"21143959\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"GDF11 suppresses hepatic HAMP expression in vivo and in vitro by decreasing BMP-SMAD signaling, enhancing SMAD ubiquitin regulatory factor 1 (SMURF1) expression, and activating ERK1/2 signaling; ERK1/2 activation is required for GDF11/SMURF1-mediated BMP-SMAD suppression and HAMP inhibition.\",\n      \"method\": \"Exogenous GDF11 administration in mice and hepatocyte cultures; SMAD phosphorylation measurement; SMURF1 expression; ERK1/2 inhibition experiments; phlebotomy and EPO mouse models\",\n      \"journal\": \"British journal of haematology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo and in vitro corroboration with pathway inhibition experiments; single lab with multiple methods\",\n      \"pmids\": [\"31418854\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Downregulation of HAMP (hepcidin) in hepatocellular carcinoma cells promotes proliferation and migration through activation of the CDK1/STAT3 pathway, as confirmed by Western blotting showing that reduced HAMP activates CDK1/STAT3 signaling.\",\n      \"method\": \"HAMP knockdown/overexpression in SMMC-7721 and HepG2 cells; EdU proliferation assay; Transwell migration assay; flow cytometry; Western blot for CDK1/STAT3; GSEA\",\n      \"journal\": \"Diagnostics\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab; pathway placement based on Western blot correlation only; no direct mechanistic link between HAMP and CDK1/STAT3 established\",\n      \"pmids\": [\"31052210\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"HDAC3 modulates binding of transcription factors C/EBPα, HIF1α, and STAT3 to the LEAP-1/HAMP promoter, and HDAC3 inhibition upregulates HAMP (LEAP-1) expression in hepatocytes, identifying an epigenetic mechanism controlling hepcidin transcription.\",\n      \"method\": \"ChIP assay for transcription factor binding to HAMP promoter; microarray and qRT-PCR; HDAC3 inhibitor treatment in Huh7 cells and mouse model\",\n      \"journal\": \"Virologica Sinica\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct ChIP evidence for transcription factor recruitment plus functional inhibitor experiments; single lab, two orthogonal methods\",\n      \"pmids\": [\"30328580\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"In Hamp knockout mice (model of type 2B hereditary hemochromatosis), oral delivery of Dmt1 siRNA combined with dietary iron restriction suppressed duodenal Dmt1 mRNA by ~50% and reduced serum and liver non-heme iron by ~60% and >85%, demonstrating that DMT1 upregulation is a functional consequence of hepcidin deficiency and that silencing DMT1 can correct iron overload caused by HAMP loss.\",\n      \"method\": \"Hamp KO mouse model; oral siRNA delivery via ginger-derived lipid nanoparticles; qPCR for Dmt1; serum and liver iron measurement; 59Fe absorption assay\",\n      \"journal\": \"Nutrients\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo KO model with direct molecular intervention; multiple iron parameters measured; single lab\",\n      \"pmids\": [\"34063414\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"HIF-1α stabilization (via PHD inhibition by EGCG) induces Hamp expression in rat kidney, establishing that HIF-1α can positively regulate hepcidin transcription in the kidney (in contrast to its role in the liver where it represses hepcidin).\",\n      \"method\": \"In vivo EGCG dosing in rats; HIF-1α stabilization confirmed by Western blot; PHD inhibition assay; Hamp qPCR; in vitro Hep3B cell assay with EGCG\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — in vivo and in vitro data but indirect mechanism (drug effect on PHD/HIF with downstream Hamp as readout); single lab, limited mechanistic dissection\",\n      \"pmids\": [\"22138393\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"DNA methylation of the Hamp promoter region is significantly elevated after Roux-en-Y gastric bypass surgery in rats, correlating with decreased Hamp mRNA and HEPCIDIN-25 protein, establishing that promoter methylation suppresses Hamp expression in response to post-surgical iron deficiency.\",\n      \"method\": \"RNA-seq; qPCR; ELISA for hepcidin-25; MassARRAY EpiTYPER DNA methylation quantification at Hamp promoter CpG sites\",\n      \"journal\": \"Surgery for obesity and related diseases\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct methylation quantification at defined CpGs correlated with expression and protein changes; in vivo model; single lab\",\n      \"pmids\": [\"31839527\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"HAMP promoter hypomethylation (at CpG sites cg23677000 and cg04085447) upregulates hepcidin expression in Kawasaki disease patients; IVIG treatment restores methylation; luciferase reporter assays confirmed that methylation of these target CpG sites decreases HAMP gene expression.\",\n      \"method\": \"Illumina HumanMethylation450 BeadChip; pyrosequencing for validation; luciferase reporter assay with methylated/unmethylated constructs; ELISA for plasma hepcidin\",\n      \"journal\": \"Journal of molecular and cellular cardiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct functional reporter assay confirms methylation effect on promoter activity; large clinical cohort validation; single lab\",\n      \"pmids\": [\"29501389\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"The extract of Caulis Spatholobi inhibits HAMP expression in Huh7 cells by reducing phosphorylated SMAD1/5/8 levels (by 80%), with stronger inhibition of BMP6-induced than IL-6-induced HAMP expression; in vivo in mice it decreases hepatic HAMP expression by 60% and reduces hepatic iron concentration.\",\n      \"method\": \"Cell-based HAMP expression assay; pSMAD1/5/8 Western blot; BMP6 and IL-6 stimulation; in vivo mouse feeding experiment with hepatic HAMP qPCR and iron measurement\",\n      \"journal\": \"The Journal of nutrition\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pathway placement via pSMAD measurement in vitro and in vivo; single lab, multiple methods\",\n      \"pmids\": [\"23700338\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"HAMP encodes hepcidin, a liver-derived 25-residue antimicrobial peptide with four disulfide bonds that functions as the master hormonal regulator of systemic iron homeostasis by controlling ferroportin-mediated iron export from enterocytes and macrophages; its transcription is activated by BMP-SMAD signaling (modulated by hemojuvelin/matriptase-2), IL-6/STAT3, ATOH8, and GATA4/6 transcription factors, and is post-transcriptionally stabilized by PKC-dependent HuR binding to a 3'-UTR ARE element in response to saturated fatty acids; promoter DNA methylation suppresses HAMP expression under iron-deficient or post-surgical conditions; loss-of-function mutations (including disulfide-disrupting cysteine substitutions, frameshifts, premature stops, and 5'-UTR upstream-AUG mutations) abolish hepcidin protein and cause juvenile or adult-onset hereditary hemochromatosis, with severity modulated by digenic inheritance with HFE mutations.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"HAMP encodes hepcidin, a 25-residue, four-disulfide-bonded peptide isolated from human blood ultrafiltrate that displays direct antimicrobial activity and is expressed predominantly in liver [#0]. Beyond this innate-immune role, hepcidin is the central effector controlling systemic iron distribution: in hepcidin-deficient mice, ferroportin protein rises in duodenum and spleen while the iron-import machinery DMT1 and Dcytb are hyperinduced, and silencing duodenal Dmt1 corrects the resulting iron overload, establishing that hepcidin restrains dietary iron absorption by acting on these iron-transport proteins [#10, #19]. HAMP transcription integrates multiple inputs converging on hepatocyte promoter elements: the BMP-SMAD axis, in which hemojuvelin serves as a major matriptase-2 (TMPRSS6) substrate driving Hamp expression [#7] and which is suppressed by GDF11 through SMURF1/ERK1/2-mediated reduction of phospho-SMAD1/5/8 [#16]; a STAT site mediating basal and IL-6-inducible activity [#6]; and dedicated transcription factors including GATA-4/6 (antagonized by FOG proteins) [#9] and the iron- and erythropoiesis-responsive ATOH8, which acts both through promoter E-boxes and through BMP signaling [#12]. Hepcidin output is further tuned post-transcriptionally—saturated fatty acids stabilize HAMP mRNA via a 3'-UTR AU-rich element bound by PKC-activated HuR [#14]—and epigenetically through promoter DNA methylation, which suppresses expression in iron-deficient and post-surgical states [#21, #22]. Loss-of-function HAMP mutations—including cysteine substitutions that disrupt disulfide bonds, premature stop codons, frameshifts, and a 5'-UTR upstream-AUG mutation—abolish detectable hepcidin protein and cause juvenile hemochromatosis, while heterozygous variants co-inherited with HFE C282Y produce digenic adult-onset iron overload [#1, #3, #4, #11].\",\n  \"teleology\": [\n    {\n      \"year\": 2000,\n      \"claim\": \"Established the molecular identity of HAMP's product—a disulfide-rich peptide with antimicrobial activity—before its iron-regulatory role was known, defining the protein at the biochemical level.\",\n      \"evidence\": \"Mass-spectrometric isolation from human blood ultrafiltrate and radial diffusion antimicrobial assays with synthetic peptide\",\n      \"pmids\": [\"11034317\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not connect the peptide to iron homeostasis\", \"Physiological relevance of antimicrobial activity versus hormonal function not resolved\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Answered whether HAMP variation contributes to human iron-overload disease by showing HAMP mutations act as digenic modifiers of HFE-associated hemochromatosis.\",\n      \"evidence\": \"Sequencing of HAMP in hemochromatosis families and cohorts with genotype-phenotype correlation against population controls\",\n      \"pmids\": [\"12915468\", \"14670915\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not establish hepcidin protein levels in carriers\", \"Mechanism by which heterozygous loss synergizes with HFE not dissected\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Linked specific structural and regulatory HAMP lesions to absent hepcidin protein, demonstrating that disulfide integrity and correct translation initiation are required for a functional hormone.\",\n      \"evidence\": \"Sequencing of disulfide-disrupting cysteine mutations and a 5'-UTR upstream-AUG mutation, with hepcidin protein assays in urine and clinical phenotyping in juvenile hemochromatosis families\",\n      \"pmids\": [\"15198949\", \"15024747\", \"15099344\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural model of the disulfide-bonded active conformation provided\", \"Quantitative relationship between residual hepcidin and disease severity not defined\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Mapped the functional cis-elements of the HAMP promoter, identifying a STAT site as critical for basal and IL-6-inducible transcription.\",\n      \"evidence\": \"Luciferase reporter assays with promoter mutagenesis comparing human HAMP and murine Hamp constructs\",\n      \"pmids\": [\"17689119\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not identify the full set of trans-acting factors at the STAT site\", \"Species differences in promoter architecture left unresolved\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Placed HAMP regulation within a defined upstream pathway by establishing hemojuvelin as a major matriptase-2 substrate controlling Hamp expression.\",\n      \"evidence\": \"Hfe2/Tmprss6 double-knockout mice with Hamp expression and serum/liver iron quantification\",\n      \"pmids\": [\"19751239\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve the direct biochemical cleavage event on hemojuvelin\", \"How the pathway scales hepcidin output to iron load not quantified\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Expanded the transcription-factor repertoire controlling HAMP by identifying GATA-4/6 activation (suppressed by FOG) and USF binding at promoter elements.\",\n      \"evidence\": \"Promoter deletion/mutagenesis, luciferase reporters, EMSA/ChIP in Huh7 cells; USF1/2 co-transfection reporter assays in HepG2\",\n      \"pmids\": [\"21971825\", \"21143959\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Physiological signals upstream of GATA/USF engagement not defined\", \"Relative contribution versus BMP-SMAD and STAT inputs unquantified\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Demonstrated the downstream consequence of hepcidin loss—dysregulation of the iron-transport machinery—and showed partial hepcidin-independent compensation.\",\n      \"evidence\": \"Hamp-/- mice on iron-deficient diet with qPCR and Western blot for ferroportin, DMT1, Dcytb; LC-MS/MS confirmation of absent hepcidin in a p.R75X patient\",\n      \"pmids\": [\"22241739\", \"22297252\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Nature of hepcidin-independent compensatory mechanisms not identified\", \"Single-patient protein confirmation for the nonsense mutation\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Connected erythropoietic and iron status to HAMP transcription through ATOH8, and proposed a nuclear autoregulatory role for prohepcidin at the STAT3 promoter site.\",\n      \"evidence\": \"ChIP, promoter reporter/mutagenesis and in vivo hypoxia/EPO models for ATOH8; immunofluorescence localization and reporter gain/loss-of-function for prohepcidin in WRL68 cells; Caulis Spatholobi pSMAD experiments\",\n      \"pmids\": [\"24236640\", \"23390933\", \"23700338\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Prohepcidin nuclear autoregulation rests on a single lab without reciprocal validation\", \"Physiological extent of prohepcidin feedback in vivo unknown\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Established that HAMP is regulated post-transcriptionally, defining a saturated-fatty-acid-responsive HuR/ARE mRNA-stabilization mechanism distinct from promoter control.\",\n      \"evidence\": \"Actinomycin D chase, 3'-UTR ARE reporter and mutagenesis, HuR siRNA, PKC inhibitors and HuR-HAMP mRNA binding assays\",\n      \"pmids\": [\"26304124\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo relevance of fatty-acid-driven stabilization to systemic iron not established\", \"Interplay with transcriptional inputs not integrated\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Added epigenetic and growth-factor layers to HAMP control: HDAC3-dependent transcription-factor recruitment, GDF11-driven BMP-SMAD suppression, and promoter methylation responsive to systemic iron state.\",\n      \"evidence\": \"ChIP and HDAC3 inhibition; GDF11 administration with SMAD/SMURF1/ERK1/2 dissection in mice and hepatocytes; MassARRAY methylation and reporter assays in surgical and Kawasaki-disease models\",\n      \"pmids\": [\"30328580\", \"31418854\", \"31839527\", \"29501389\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How these layers are coordinated with canonical BMP/STAT signaling unresolved\", \"Causal hierarchy among methylation, HDAC3, and transcription factors not ordered\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Validated DMT1 as a therapeutically actionable downstream node of hepcidin deficiency, showing its silencing corrects HAMP-loss iron overload.\",\n      \"evidence\": \"Oral Dmt1 siRNA via lipid nanoparticles plus dietary iron restriction in Hamp-KO mice with 59Fe absorption and iron measurements\",\n      \"pmids\": [\"34063414\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Long-term efficacy and ferroportin-axis effects not assessed\", \"Generalizability to human HAMP-related hemochromatosis untested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the diverse transcriptional (BMP-SMAD, STAT, GATA, ATOH8, USF, HDAC3), post-transcriptional (HuR/ARE), and epigenetic (DNA methylation) inputs are quantitatively integrated to set hepcidin output—and the structural basis of the disulfide-bonded active peptide—remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model weighting the relative inputs to HAMP transcription\", \"No experimental structure of the mature peptide bound to ferroportin\", \"Tissue-specific regulation (e.g. kidney HIF-1α) not integrated with hepatic control\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0090729\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [10, 19]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [13]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": []},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [10, 19]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"FPN1\", \"TMPRSS6\", \"HJV\", \"GATA4\", \"GATA6\", \"ATOH8\", \"ELAVL1\", \"SERPINA1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"tie","faith_supported":5,"faith_total":5,"faith_pct":100.0}}