{"gene":"UMOD","run_date":"2026-04-28T21:43:01","timeline":{"discoveries":[{"year":2002,"finding":"UMOD mutations (missense) cause misfolding of uromodulin protein, disrupting its tertiary structure and leading to medullary cystic kidney disease 2 (MCKD2) and familial juvenile hyperuricaemic nephropathy (FJHN); uromodulin is a GPI-anchored glycoprotein and the most abundant protein in normal urine.","method":"DNA sequencing of UMOD in affected families; genetic segregation analysis","journal":"Journal of medical genetics","confidence":"High","confidence_rationale":"Tier 2 — first identification of causative mutations, replicated across multiple families, foundational paper with 361 citations","pmids":["12471200"],"is_preprint":false},{"year":2003,"finding":"UMOD missense mutations cause accumulation of uromodulin within tubular cells (thick ascending limb) rather than apical secretion, resulting in markedly decreased urinary excretion of wild-type uromodulin; mutations cluster in exon 4.","method":"Immunostaining of renal biopsies; urinary uromodulin measurement in FJHN patients with confirmed UMOD mutations","journal":"Journal of the American Society of Nephrology : JASN","confidence":"High","confidence_rationale":"Tier 2 — direct immunohistochemical and biochemical characterization in patient tissue, replicated across multiple families, 168 citations","pmids":["14569098"],"is_preprint":false},{"year":2010,"finding":"Uromodulin (UMOD) is expressed in primary cilia of renal tubules; UMOD mutations result in a significantly decreased number of UMOD-positive primary cilia and UMOD colocalizes with ciliary proteins nephrocystin-1 and kinesin family member 3A, as well as at mitotic spindle poles.","method":"Immunofluorescence on human kidney biopsy samples; electron microscopy; cell culture immunofluorescence","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 — direct localization with functional consequence (mutation reduces ciliary expression), single lab but orthogonal methods","pmids":["20172860"],"is_preprint":false},{"year":2011,"finding":"Mutant uromodulin undergoes endoplasmic reticulum (ER) retention with retarded intracellular trafficking and reduced secretion into cell culture media; the severity of ER retention correlates with clinical phenotype severity (in-frame indel mutation shows less ER retention and milder clinical course than C150S mutation).","method":"In vitro functional characterization of mutant uromodulin isoforms: uromodulin staining of patient biopsy, cell culture secretion assays, ER retention analysis","journal":"Clinical journal of the American Society of Nephrology : CJASN","confidence":"Medium","confidence_rationale":"Tier 2 — in vitro trafficking assay with comparative mutation analysis and clinical correlation, single lab","pmids":["22034507"],"is_preprint":false},{"year":2011,"finding":"Accumulation of mutant uromodulin in ER of renal tubular cells (thick ascending limb) is associated with ER stress, as evidenced by strong co-expression of the ER stress marker GRP78 (BiP) in a perinuclear pattern, providing a mechanism for disease progression.","method":"Immunohistochemistry for uromodulin and GRP78 in kidney biopsies of UMOD-mutation carriers vs. non-mutation controls","journal":"American journal of kidney diseases : the official journal of the National Kidney Foundation","confidence":"Medium","confidence_rationale":"Tier 2 — direct tissue-based demonstration of ER stress marker co-localization with mutant uromodulin, controlled comparison","pmids":["21978600"],"is_preprint":false},{"year":2013,"finding":"UMOD missense mutations (Val109Glu, Pro236Gln, Cys248Trp) cause mutant uromodulin to be retained in the endoplasmic reticulum rather than trafficked to the Golgi apparatus, and substantially reduce uromodulin secretion into cell culture supernatant compared to wild-type.","method":"Site-directed mutagenesis, transfection of HEK293 cells, western blot for protein expression, immunofluorescence for intracellular localization (ER vs. Golgi)","journal":"Gene","confidence":"Medium","confidence_rationale":"Tier 1–2 — reconstitution in cells with mutagenesis and dual-localization readout, single lab","pmids":["23988501"],"is_preprint":false},{"year":2013,"finding":"Common noncoding UMOD promoter risk variants increase uromodulin expression; uromodulin overexpression activates the renal sodium cotransporter NKCC2, leading to salt-sensitive hypertension and age-dependent renal lesions in transgenic mice; pharmacological inhibition of NKCC2 (loop diuretics) is more effective in UMOD risk-variant homozygotes.","method":"Transgenic mouse overexpression model; in vitro promoter-expression assays; clinical pharmacological study with NKCC2 inhibitor stratified by genotype","journal":"Nature medicine","confidence":"High","confidence_rationale":"Tier 1–2 — multiple orthogonal methods (transgenic animal, in vitro, human clinical), strong mechanistic link between uromodulin and NKCC2-mediated sodium reabsorption, 295 citations","pmids":["24185693"],"is_preprint":false},{"year":2017,"finding":"ADTKD-UMOD mouse kidneys (Tg UmodC147W) show secondary mitochondrial dysfunction: decreased mitochondrial protein abundance, disturbed mitochondrial fission (reduced FIS1), impaired OXPHOS and citrate cycle, and activation of the LKB1-AMPK energy-deficit sensor pathway, all downstream of primary ER stress/UPR caused by mutant uromodulin retention.","method":"Quantitative LC-MS/MS proteomics of TAL-enriched outer renal medulla from ADTKD-UMOD vs. control mice; immunoblotting for UPR markers (BiP/HSPA5, phospho-eIF2α, ATF4, ATF6, CHOP)","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 — quantitative proteomics in well-characterized mouse model with UPR validation, single lab","pmids":["28220896"],"is_preprint":false},{"year":2017,"finding":"In transgenic mice expressing mutant uromodulin (Tg UmodC147W), transcriptional profiling shows upregulation of inflammation and fibrosis and downregulation of lipid metabolism before any histological kidney damage, with pro-inflammatory signals preceding fibrosis onset and detectable in the first week after birth.","method":"Kidney transcriptional profiling (microarray/RNA-seq) of young Tg UmodC147W mice vs. controls at presymptomatic stage","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 — genome-wide expression profiling in transgenic disease model at early timepoint, single lab","pmids":["28785050"],"is_preprint":false},{"year":2017,"finding":"Homozygous UMOD mutation (p.C120Y) produces a gene dosage effect: homozygote carriers show unprecedented low urinary uromodulin levels and aberrant uromodulin fragments compared to heterozygote carriers, demonstrating that each allele contributes quantitatively to uromodulin processing and excretion.","method":"Clinical comparison of heterozygote vs. homozygote mutation carriers from consanguineous family; urine uromodulin measurement and fragment analysis","journal":"Nephrology, dialysis, transplantation","confidence":"Medium","confidence_rationale":"Tier 2 — natural human experiment comparing gene dosage, direct protein measurement, single case but exceptional design","pmids":["28605509"],"is_preprint":false},{"year":2011,"finding":"Mutant human uromodulin (C148W) shows altered intracellular localization (change in glycosylation pattern detected by deglycosylation experiment) in transgenic mouse kidneys; mutant uromodulin expression induces 5α-reductase 2 and downstream androgen-regulated gene expression (β-glucuronidase, ornithine decarboxylase, cytochrome P450 4a12a) in kidney.","method":"Transgenic mouse model expressing mutant human UMOD; deglycosylation experiments; microarray and quantitative RT-PCR","journal":"Journal of pharmacological sciences","confidence":"Low","confidence_rationale":"Tier 3 — indirect downstream gene expression changes in transgenic model, mechanism of androgen pathway activation not directly established","pmids":["21358122"],"is_preprint":false},{"year":2022,"finding":"UMOD missense variant p.Thr62Pro causes an intermediate trafficking defect in vitro and modest ER stress induction compared to canonical ADTKD mutations, with incomplete penetrance and intermediate reduction of urinary uromodulin levels, defining an intermediate-effect variant.","method":"Cell model trafficking assay; in silico simulation; patient urine uromodulin measurement; population database and biobank analysis","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 — in vitro trafficking assay combined with patient biomarker data and population genetics, single lab but multiple orthogonal methods","pmids":["35947615"],"is_preprint":false},{"year":2022,"finding":"ER stress-induced CHOP (C/EBP homologous protein) upregulation in ADTKD-UMOD mediates epithelial-to-myofibroblast transformation (EMT) in renal tubular epithelial cells, with CHOP knockdown restoring vimentin and fibronectin upregulation caused by ER stress, suggesting a mechanism for renal interstitial fibrosis.","method":"Immunostaining of UMOD/GRP78/CHOP in patient kidney biopsies; in vitro ER stress induction by tunicamycin in renal tubular cells; CHOP knockdown; western blot for EMT markers (E-cadherin, vimentin, fibronectin)","journal":"International journal of medical sciences","confidence":"Medium","confidence_rationale":"Tier 2 — direct knockdown experiment with defined EMT phenotypic readout, combined with human tissue validation, single lab","pmids":["35165522"],"is_preprint":false},{"year":2022,"finding":"miR-103a-3p targets UMOD, and UMOD positively interacts with TRPV5; UMOD silencing reverses the protective effect of TRPV5 overexpression on oxalate-induced cell injury and calcium oxalate crystal adhesion; downregulating miR-103a-3p activates the UMOD/TRPV5 axis to mitigate calcium oxalate deposition in rat kidney.","method":"Co-immunoprecipitation (CoIP) and cell-surface biotinylation assays for UMOD-TRPV5 interaction; luciferase assay for miR-103a-3p targeting UMOD; TRPV5 overexpression and UMOD silencing in NRK-52E cells; rat ethylene glycol model with IHC and western blot","journal":"Disease markers","confidence":"Medium","confidence_rationale":"Tier 2 — CoIP establishes UMOD-TRPV5 interaction, rescue experiments in cell and animal models, single lab","pmids":["35251369"],"is_preprint":false},{"year":2026,"finding":"Calorie restriction stimulates autophagy (via mTOR suppression and recovery of ER-phagy receptor genes) and promotes degradation of mutant uromodulin in thick ascending limb cells, reducing ER retention and ameliorating ER stress, inflammation, and fibrosis in ADTKD-UMOD transgenic mice.","method":"Transgenic Tg UmodC147W mice subjected to 30% calorie restriction; autophagy markers (P62, mTOR activation); ER-phagy receptor gene expression; mutant uromodulin ER retention by immunostaining; kidney function and fibrosis assessment","journal":"Journal of the American Society of Nephrology : JASN","confidence":"Medium","confidence_rationale":"Tier 2 — mechanistic intervention study in transgenic disease model with multiple pathway readouts, single lab","pmids":["41632531"],"is_preprint":false},{"year":2026,"finding":"Lipocalin-2 (LCN2) is induced by intracellular uromodulin aggregates and ER stress in thick ascending limb cells; stimulation of autophagy with Torin1 reduces uromodulin aggregates and attenuates LCN2 induction; genetic deletion of Lcn2 decreases interstitial iron deposition but does not alter uromodulin accumulation, inflammation, or fibrosis, indicating LCN2 is a biomarker of toxic proteinopathy but not a driver of kidney damage.","method":"Umod knock-in mouse models (C171Y, R186S, C125R); immunoblotting, immunostaining, ELISA for LCN2; Torin1 autophagy stimulation in mIMCD3 cells; Lcn2-/- x UmodR186S/+ cross; kidney function, inflammation, fibrosis assessment","journal":"Journal of the American Society of Nephrology : JASN","confidence":"Medium","confidence_rationale":"Tier 1–2 — genetic epistasis (double KO), pharmacological intervention, and multiple disease models in one study, single lab","pmids":["41885939"],"is_preprint":false},{"year":2025,"finding":"Urinary UMOD filaments naturally form salt-dependent sheet structures ('velcro sheets') that interact with uropathogenic E. coli (UPEC) type I pili; a lateral interface between UMOD polymers mediates sheet formation, and mutation of this interface disrupts UMOD filament bundle formation in mammalian cells; absence of N-terminal branches promotes stacking of UMOD sheets into thick 3D matrices.","method":"Cryo-electron tomography (cryo-ET) of urinary UMOD filaments with UPEC; single-particle cryo-electron microscopy (cryo-EM) for high-resolution structure of sheets; mutagenesis of lateral interface with functional assessment in mammalian cells; elastase treatment of UMOD","journal":"bioRxiv","confidence":"High","confidence_rationale":"Tier 1 — cryo-ET and cryo-EM structural determination with mutagenesis validation in mammalian cells, strong mechanistic insight","pmids":[],"is_preprint":true},{"year":1993,"finding":"The UMOD gene (encoding uromodulin/Tamm-Horsfall glycoprotein) was chromosomally assigned to 16p13.11, with expression confirmed in mature kidney and absent in Wilms tumors.","method":"cDNA cloning, DNA sequencing, somatic cell hybrid panel hybridization for chromosomal localization, RNA expression analysis","journal":"Cytogenetics and cell genetics","confidence":"Medium","confidence_rationale":"Tier 2 — direct chromosomal mapping by somatic cell hybrid panel, tissue expression validated","pmids":["8382593"],"is_preprint":false},{"year":2024,"finding":"IGFBP1 stabilizes Umod expression through m6A modification in bladder epithelial cells; overexpression of IGFBP1 or Umod inhibits cell apoptosis and blocks NF-κB and ERK signaling pathways, reducing pro-inflammatory cytokine production in a cystitis model.","method":"GEO transcriptome analysis; m6A modification assay; IGFBP1/Umod overexpression in primary cystitis cells; qRT-PCR, western blot; rat cystitis model with in vivo overexpression","journal":"International immunopharmacology","confidence":"Low","confidence_rationale":"Tier 3 — m6A stabilization mechanism demonstrated in cell model but limited mechanistic depth on UMOD-specific function; bladder/cystitis context may be secondary expression","pmids":["38759370"],"is_preprint":false}],"current_model":"UMOD encodes uromodulin, a GPI-anchored glycoprotein exclusively expressed in the thick ascending limb of Henle's loop, where it is proteolytically cleaved and secreted as the most abundant urinary protein; disease-causing missense mutations cause misfolding and ER retention of uromodulin leading to ER stress, UPR activation, secondary mitochondrial dysfunction, and downstream inflammation and fibrosis, while wild-type uromodulin regulates sodium reabsorption by activating NKCC2 (linking it to blood pressure control), assembles into supramolecular 'velcro-like' filament sheets that trap uropathogenic E. coli via type I pili interaction (providing innate urinary tract defense), and interacts with TRPV5 to regulate calcium handling."},"narrative":{"teleology":[{"year":1993,"claim":"Establishing the genomic identity of UMOD: chromosomal mapping to 16p13.11 and confirmation of kidney-restricted expression provided the foundation for subsequent genetic studies.","evidence":"cDNA cloning, somatic cell hybrid panel for chromosomal localization, tissue RNA expression analysis","pmids":["8382593"],"confidence":"Medium","gaps":["Protein function and processing pathway not yet characterized","Cell-type-specific expression within the kidney not resolved"]},{"year":2002,"claim":"Identification of UMOD as the causative gene for MCKD2 and FJHN resolved the genetic basis of these autosomal dominant kidney diseases and established that missense mutations disrupt uromodulin's tertiary structure.","evidence":"DNA sequencing of UMOD in multiple affected families with segregation analysis","pmids":["12471200"],"confidence":"High","gaps":["Mechanism of pathogenicity (misfolding vs. loss of function) not yet distinguished","Intracellular fate of mutant protein unknown"]},{"year":2003,"claim":"Demonstrating that mutant uromodulin accumulates intracellularly in thick ascending limb cells rather than reaching the apical surface established a trafficking defect as the primary cellular consequence of UMOD mutations.","evidence":"Immunostaining of renal biopsies from FJHN patients; urinary uromodulin quantification","pmids":["14569098"],"confidence":"High","gaps":["Subcellular compartment of retention not yet identified","Whether accumulation is directly cytotoxic or causes loss of extracellular function was unclear"]},{"year":2011,"claim":"Pinpointing the endoplasmic reticulum as the site of mutant uromodulin retention, with severity correlating to clinical phenotype, established ER retention and associated ER stress (GRP78/BiP upregulation) as the proximal disease mechanism in ADTKD-UMOD.","evidence":"In vitro cell culture trafficking assays with comparative mutations; immunohistochemistry for uromodulin and GRP78 in patient biopsies vs. controls","pmids":["22034507","21978600"],"confidence":"Medium","gaps":["Downstream pathways connecting ER stress to tissue damage not yet mapped","Whether ER stress is sufficient to cause fibrosis was untested"]},{"year":2010,"claim":"Discovery that uromodulin localizes to primary cilia and that UMOD mutations reduce ciliary uromodulin expression raised the possibility of a ciliopathy component, though the functional significance of ciliary uromodulin remains unclear.","evidence":"Immunofluorescence and electron microscopy on human kidney biopsies and cell culture","pmids":["20172860"],"confidence":"Medium","gaps":["Functional role of uromodulin in cilia not established","Whether ciliary loss is secondary to ER retention not resolved","Single-lab observation without independent replication"]},{"year":2013,"claim":"Establishing that uromodulin overexpression activates NKCC2-mediated sodium reabsorption in the thick ascending limb linked common UMOD risk variants to salt-sensitive hypertension and revealed the physiological function of secreted uromodulin in electrolyte handling.","evidence":"Transgenic mouse overexpression model; in vitro promoter assays; clinical pharmacogenomic study with loop diuretics stratified by UMOD genotype","pmids":["24185693"],"confidence":"High","gaps":["Molecular mechanism by which uromodulin activates NKCC2 (direct interaction vs. indirect signaling) not defined","Whether NKCC2 activation occurs at the cell surface or during trafficking unknown"]},{"year":2017,"claim":"Proteomic and transcriptomic profiling of ADTKD-UMOD mouse kidneys revealed that ER stress from mutant uromodulin causes secondary mitochondrial dysfunction (impaired OXPHOS, reduced FIS1) and activates inflammatory and fibrotic gene programs before histological damage, establishing a temporal cascade from ER stress to tissue injury.","evidence":"Quantitative LC-MS/MS proteomics of TAL-enriched medulla; kidney transcriptional profiling at presymptomatic timepoints in Tg UmodC147W mice","pmids":["28220896","28785050"],"confidence":"Medium","gaps":["Whether mitochondrial dysfunction is directly causative of fibrosis or an epiphenomenon not tested by intervention","Inflammatory mediator hierarchy not resolved"]},{"year":2022,"claim":"Multiple studies refined the disease mechanism: CHOP-mediated epithelial-to-myofibroblast transition was identified as a downstream effector of ER stress driving fibrosis; uromodulin was shown to interact with TRPV5 to regulate calcium handling; and intermediate-effect UMOD variants demonstrated a continuous spectrum of trafficking impairment and clinical severity.","evidence":"CHOP knockdown reversing EMT markers in tunicamycin-treated renal cells with patient biopsy validation; Co-IP and rescue experiments for UMOD-TRPV5 interaction; cell trafficking assays and population genetics for intermediate variant p.Thr62Pro","pmids":["35165522","35251369","35947615"],"confidence":"Medium","gaps":["UMOD-TRPV5 interaction demonstrated by single Co-IP study without independent replication","Whether CHOP is necessary in vivo for ADTKD-UMOD fibrosis not tested genetically","Structural basis of UMOD-TRPV5 interaction unknown"]},{"year":2025,"claim":"Cryo-EM/ET structural analysis revealed that urinary uromodulin filaments laterally associate into salt-dependent 'velcro sheets' that entrap uropathogenic E. coli via type I pili, providing a structural basis for uromodulin's role in innate urinary tract defense.","evidence":"Cryo-electron tomography of UMOD filaments with UPEC; single-particle cryo-EM of sheet structures; mutagenesis of lateral interface in mammalian cells (preprint)","pmids":[],"confidence":"High","gaps":["Study is a preprint awaiting peer review","In vivo validation of sheet-mediated bacterial trapping not performed","Whether sheet formation is required for anti-bacterial defense versus polymer formation alone not distinguished"]},{"year":2026,"claim":"Autophagy stimulation (via calorie restriction or mTOR inhibition) was shown to clear ER-retained mutant uromodulin aggregates and ameliorate ER stress, inflammation, and fibrosis, while genetic deletion of the ER-stress-induced biomarker LCN2 did not prevent kidney damage, distinguishing therapeutic targets from disease biomarkers.","evidence":"Calorie restriction in Tg UmodC147W mice with autophagy and ER-phagy readouts; Torin1 treatment in mIMCD3 cells; Lcn2 knockout crossed with UmodR186S/+ knock-in mice","pmids":["41632531","41885939"],"confidence":"Medium","gaps":["Pharmacological autophagy inducers not yet tested in clinical trials for ADTKD-UMOD","Whether ER-phagy versus bulk autophagy is the operative clearance pathway not genetically dissected","Long-term efficacy and safety of calorie restriction in patients unknown"]},{"year":null,"claim":"The molecular mechanism by which secreted uromodulin activates NKCC2, the structural basis of the UMOD-TRPV5 interaction, and whether pharmacological autophagy induction can treat ADTKD-UMOD in humans remain unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No direct binding site or activation mechanism for uromodulin-NKCC2 interaction defined","No high-resolution structure of full-length membrane-anchored uromodulin","No clinical trial data for autophagy-based therapy in ADTKD-UMOD"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[6,13]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[16]}],"localization":[{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[3,4,5,11]},{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[0,1,16]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,6]},{"term_id":"GO:0005929","term_label":"cilium","supporting_discovery_ids":[2]}],"pathway":[{"term_id":"R-HSA-382551","term_label":"Transport of small molecules","supporting_discovery_ids":[6,13]},{"term_id":"R-HSA-8953897","term_label":"Cellular responses to stimuli","supporting_discovery_ids":[4,7,12,14]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[8,16]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[14,15]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[0,1,3,4,7,12]}],"complexes":[],"partners":["SLC12A1","TRPV5"],"other_free_text":[]},"mechanistic_narrative":"UMOD encodes uromodulin (Tamm-Horsfall glycoprotein), a GPI-anchored glycoprotein exclusively expressed in the thick ascending limb of Henle's loop that is proteolytically cleaved and released as the most abundant protein in normal urine, where it assembles into filament sheets that trap uropathogenic bacteria and regulates tubular ion transport. Wild-type uromodulin activates the sodium cotransporter NKCC2 to promote salt reabsorption—linking common UMOD promoter variants to salt-sensitive hypertension—and interacts with TRPV5 to modulate renal calcium handling [PMID:24185693, PMID:35251369]. Missense mutations in UMOD, predominantly affecting cysteine residues in exon 4, cause misfolding and endoplasmic reticulum retention of uromodulin with consequent ER stress (UPR activation via BiP/CHOP), secondary mitochondrial dysfunction, inflammation, epithelial-to-myofibroblast transition, and progressive tubulointerstitial fibrosis, manifesting as autosomal dominant tubulointerstitial kidney disease (ADTKD-UMOD), including familial juvenile hyperuricaemic nephropathy and medullary cystic kidney disease type 2 [PMID:12471200, PMID:21978600, PMID:28220896, PMID:35165522]. Stimulation of autophagy promotes clearance of ER-retained mutant uromodulin aggregates and ameliorates downstream pathology in disease models [PMID:41632531, PMID:41885939]."},"prefetch_data":{"uniprot":{"accession":"P07911","full_name":"Uromodulin","aliases":["Tamm-Horsfall urinary glycoprotein","THP"],"length_aa":640,"mass_kda":69.8,"function":"Functions in biogenesis and organization of the apical membrane of epithelial cells of the thick ascending limb of Henle's loop (TALH), where it promotes formation of complex filamentous gel-like structure that may play a role in the water barrier permeability (Probable). May serve as a receptor for binding and endocytosis of cytokines (IL-1, IL-2) and TNF (PubMed:3498215). Facilitates neutrophil migration across renal epithelia (PubMed:20798515) In the urine, may contribute to colloid osmotic pressure, retards passage of positively charged electrolytes, and inhibits formation of liquid containing supersaturated salts and subsequent formation of salt crystals (By similarity). Protects against urinary tract infections by binding to type 1 fimbriated E.coli (PubMed:11134021, PubMed:32616672). Binds to bacterial adhesin fimH which mediates the stable formation of bacterial aggregates, prevents the binding of E.coli to uroplakins UPK1A and UPK1B which act as urothelial receptors for type I fimbriae, and allows for pathogen clearance through micturation (PubMed:11134021, PubMed:32616672). Also promotes aggregation of other bacteria including K.pneumoniae, P.aeruginosa and S.mitis and so may also protect against other uropathogens (PubMed:32616672)","subcellular_location":"Secreted","url":"https://www.uniprot.org/uniprotkb/P07911/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/UMOD","classification":"Not Classified","n_dependent_lines":20,"n_total_lines":1208,"dependency_fraction":0.016556291390728478},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/UMOD","total_profiled":1310},"omim":[{"mim_id":"618061","title":"POLYCYSTIC KIDNEY DISEASE 6 WITH OR WITHOUT POLYCYSTIC LIVER DISEASE; PKD6","url":"https://www.omim.org/entry/618061"},{"mim_id":"617056","title":"TUBULOINTERSTITIAL KIDNEY DISEASE, AUTOSOMAL DOMINANT 5; ADTKD5","url":"https://www.omim.org/entry/617056"},{"mim_id":"614227","title":"HYPERURICEMIC NEPHROPATHY, FAMILIAL JUVENILE, 3; HNFJ3","url":"https://www.omim.org/entry/614227"},{"mim_id":"613859","title":"UROMODULIN-LIKE 1; UMODL1","url":"https://www.omim.org/entry/613859"},{"mim_id":"613092","title":"TUBULOINTERSTITIAL KIDNEY DISEASE, AUTOSOMAL DOMINANT 4; ADTKD4","url":"https://www.omim.org/entry/613092"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"kidney","ntpm":2126.7}],"url":"https://www.proteinatlas.org/search/UMOD"},"hgnc":{"alias_symbol":[],"prev_symbol":[]},"alphafold":{"accession":"P07911","domains":[{"cath_id":"2.10.25.10","chopping":"33-67","consensus_level":"medium","plddt":88.7511,"start":33,"end":67},{"cath_id":"2.10.25","chopping":"71-109","consensus_level":"medium","plddt":89.6318,"start":71,"end":109},{"cath_id":"-","chopping":"175-313","consensus_level":"medium","plddt":86.7378,"start":175,"end":313},{"cath_id":"2.60.40.3210","chopping":"338-346_354-429","consensus_level":"high","plddt":86.6511,"start":338,"end":429},{"cath_id":"2.60.40.4100","chopping":"433-581_595-607","consensus_level":"high","plddt":90.7157,"start":433,"end":607}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P07911","model_url":"https://alphafold.ebi.ac.uk/files/AF-P07911-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P07911-F1-predicted_aligned_error_v6.png","plddt_mean":82.94},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=UMOD","jax_strain_url":"https://www.jax.org/strain/search?query=UMOD"},"sequence":{"accession":"P07911","fasta_url":"https://rest.uniprot.org/uniprotkb/P07911.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P07911/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P07911"}},"corpus_meta":[{"pmid":"12471200","id":"PMC_12471200","title":"Mutations of the UMOD gene are responsible for medullary cystic kidney disease 2 and familial juvenile hyperuricaemic nephropathy.","date":"2002","source":"Journal of medical genetics","url":"https://pubmed.ncbi.nlm.nih.gov/12471200","citation_count":361,"is_preprint":false},{"pmid":"24185693","id":"PMC_24185693","title":"Common noncoding UMOD gene variants induce salt-sensitive hypertension and kidney damage by increasing uromodulin expression.","date":"2013","source":"Nature medicine","url":"https://pubmed.ncbi.nlm.nih.gov/24185693","citation_count":295,"is_preprint":false},{"pmid":"21082022","id":"PMC_21082022","title":"Genome-wide association study of blood pressure extremes identifies variant near UMOD associated with hypertension.","date":"2010","source":"PLoS genetics","url":"https://pubmed.ncbi.nlm.nih.gov/21082022","citation_count":284,"is_preprint":false},{"pmid":"14569098","id":"PMC_14569098","title":"A cluster of mutations in the UMOD gene causes familial juvenile hyperuricemic 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analysis\",\n      \"journal\": \"Journal of medical genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — first identification of causative mutations, replicated across multiple families, foundational paper with 361 citations\",\n      \"pmids\": [\"12471200\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"UMOD missense mutations cause accumulation of uromodulin within tubular cells (thick ascending limb) rather than apical secretion, resulting in markedly decreased urinary excretion of wild-type uromodulin; mutations cluster in exon 4.\",\n      \"method\": \"Immunostaining of renal biopsies; urinary uromodulin measurement in FJHN patients with confirmed UMOD mutations\",\n      \"journal\": \"Journal of the American Society of Nephrology : JASN\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct immunohistochemical and biochemical characterization in patient tissue, replicated across multiple families, 168 citations\",\n      \"pmids\": [\"14569098\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Uromodulin (UMOD) is expressed in primary cilia of renal tubules; UMOD mutations result in a significantly decreased number of UMOD-positive primary cilia and UMOD colocalizes with ciliary proteins nephrocystin-1 and kinesin family member 3A, as well as at mitotic spindle poles.\",\n      \"method\": \"Immunofluorescence on human kidney biopsy samples; electron microscopy; cell culture immunofluorescence\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct localization with functional consequence (mutation reduces ciliary expression), single lab but orthogonal methods\",\n      \"pmids\": [\"20172860\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Mutant uromodulin undergoes endoplasmic reticulum (ER) retention with retarded intracellular trafficking and reduced secretion into cell culture media; the severity of ER retention correlates with clinical phenotype severity (in-frame indel mutation shows less ER retention and milder clinical course than C150S mutation).\",\n      \"method\": \"In vitro functional characterization of mutant uromodulin isoforms: uromodulin staining of patient biopsy, cell culture secretion assays, ER retention analysis\",\n      \"journal\": \"Clinical journal of the American Society of Nephrology : CJASN\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vitro trafficking assay with comparative mutation analysis and clinical correlation, single lab\",\n      \"pmids\": [\"22034507\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Accumulation of mutant uromodulin in ER of renal tubular cells (thick ascending limb) is associated with ER stress, as evidenced by strong co-expression of the ER stress marker GRP78 (BiP) in a perinuclear pattern, providing a mechanism for disease progression.\",\n      \"method\": \"Immunohistochemistry for uromodulin and GRP78 in kidney biopsies of UMOD-mutation carriers vs. non-mutation controls\",\n      \"journal\": \"American journal of kidney diseases : the official journal of the National Kidney Foundation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct tissue-based demonstration of ER stress marker co-localization with mutant uromodulin, controlled comparison\",\n      \"pmids\": [\"21978600\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"UMOD missense mutations (Val109Glu, Pro236Gln, Cys248Trp) cause mutant uromodulin to be retained in the endoplasmic reticulum rather than trafficked to the Golgi apparatus, and substantially reduce uromodulin secretion into cell culture supernatant compared to wild-type.\",\n      \"method\": \"Site-directed mutagenesis, transfection of HEK293 cells, western blot for protein expression, immunofluorescence for intracellular localization (ER vs. Golgi)\",\n      \"journal\": \"Gene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 — reconstitution in cells with mutagenesis and dual-localization readout, single lab\",\n      \"pmids\": [\"23988501\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Common noncoding UMOD promoter risk variants increase uromodulin expression; uromodulin overexpression activates the renal sodium cotransporter NKCC2, leading to salt-sensitive hypertension and age-dependent renal lesions in transgenic mice; pharmacological inhibition of NKCC2 (loop diuretics) is more effective in UMOD risk-variant homozygotes.\",\n      \"method\": \"Transgenic mouse overexpression model; in vitro promoter-expression assays; clinical pharmacological study with NKCC2 inhibitor stratified by genotype\",\n      \"journal\": \"Nature medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — multiple orthogonal methods (transgenic animal, in vitro, human clinical), strong mechanistic link between uromodulin and NKCC2-mediated sodium reabsorption, 295 citations\",\n      \"pmids\": [\"24185693\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"ADTKD-UMOD mouse kidneys (Tg UmodC147W) show secondary mitochondrial dysfunction: decreased mitochondrial protein abundance, disturbed mitochondrial fission (reduced FIS1), impaired OXPHOS and citrate cycle, and activation of the LKB1-AMPK energy-deficit sensor pathway, all downstream of primary ER stress/UPR caused by mutant uromodulin retention.\",\n      \"method\": \"Quantitative LC-MS/MS proteomics of TAL-enriched outer renal medulla from ADTKD-UMOD vs. control mice; immunoblotting for UPR markers (BiP/HSPA5, phospho-eIF2α, ATF4, ATF6, CHOP)\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — quantitative proteomics in well-characterized mouse model with UPR validation, single lab\",\n      \"pmids\": [\"28220896\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"In transgenic mice expressing mutant uromodulin (Tg UmodC147W), transcriptional profiling shows upregulation of inflammation and fibrosis and downregulation of lipid metabolism before any histological kidney damage, with pro-inflammatory signals preceding fibrosis onset and detectable in the first week after birth.\",\n      \"method\": \"Kidney transcriptional profiling (microarray/RNA-seq) of young Tg UmodC147W mice vs. controls at presymptomatic stage\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genome-wide expression profiling in transgenic disease model at early timepoint, single lab\",\n      \"pmids\": [\"28785050\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Homozygous UMOD mutation (p.C120Y) produces a gene dosage effect: homozygote carriers show unprecedented low urinary uromodulin levels and aberrant uromodulin fragments compared to heterozygote carriers, demonstrating that each allele contributes quantitatively to uromodulin processing and excretion.\",\n      \"method\": \"Clinical comparison of heterozygote vs. homozygote mutation carriers from consanguineous family; urine uromodulin measurement and fragment analysis\",\n      \"journal\": \"Nephrology, dialysis, transplantation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — natural human experiment comparing gene dosage, direct protein measurement, single case but exceptional design\",\n      \"pmids\": [\"28605509\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Mutant human uromodulin (C148W) shows altered intracellular localization (change in glycosylation pattern detected by deglycosylation experiment) in transgenic mouse kidneys; mutant uromodulin expression induces 5α-reductase 2 and downstream androgen-regulated gene expression (β-glucuronidase, ornithine decarboxylase, cytochrome P450 4a12a) in kidney.\",\n      \"method\": \"Transgenic mouse model expressing mutant human UMOD; deglycosylation experiments; microarray and quantitative RT-PCR\",\n      \"journal\": \"Journal of pharmacological sciences\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — indirect downstream gene expression changes in transgenic model, mechanism of androgen pathway activation not directly established\",\n      \"pmids\": [\"21358122\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"UMOD missense variant p.Thr62Pro causes an intermediate trafficking defect in vitro and modest ER stress induction compared to canonical ADTKD mutations, with incomplete penetrance and intermediate reduction of urinary uromodulin levels, defining an intermediate-effect variant.\",\n      \"method\": \"Cell model trafficking assay; in silico simulation; patient urine uromodulin measurement; population database and biobank analysis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vitro trafficking assay combined with patient biomarker data and population genetics, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"35947615\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"ER stress-induced CHOP (C/EBP homologous protein) upregulation in ADTKD-UMOD mediates epithelial-to-myofibroblast transformation (EMT) in renal tubular epithelial cells, with CHOP knockdown restoring vimentin and fibronectin upregulation caused by ER stress, suggesting a mechanism for renal interstitial fibrosis.\",\n      \"method\": \"Immunostaining of UMOD/GRP78/CHOP in patient kidney biopsies; in vitro ER stress induction by tunicamycin in renal tubular cells; CHOP knockdown; western blot for EMT markers (E-cadherin, vimentin, fibronectin)\",\n      \"journal\": \"International journal of medical sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct knockdown experiment with defined EMT phenotypic readout, combined with human tissue validation, single lab\",\n      \"pmids\": [\"35165522\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"miR-103a-3p targets UMOD, and UMOD positively interacts with TRPV5; UMOD silencing reverses the protective effect of TRPV5 overexpression on oxalate-induced cell injury and calcium oxalate crystal adhesion; downregulating miR-103a-3p activates the UMOD/TRPV5 axis to mitigate calcium oxalate deposition in rat kidney.\",\n      \"method\": \"Co-immunoprecipitation (CoIP) and cell-surface biotinylation assays for UMOD-TRPV5 interaction; luciferase assay for miR-103a-3p targeting UMOD; TRPV5 overexpression and UMOD silencing in NRK-52E cells; rat ethylene glycol model with IHC and western blot\",\n      \"journal\": \"Disease markers\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — CoIP establishes UMOD-TRPV5 interaction, rescue experiments in cell and animal models, single lab\",\n      \"pmids\": [\"35251369\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"Calorie restriction stimulates autophagy (via mTOR suppression and recovery of ER-phagy receptor genes) and promotes degradation of mutant uromodulin in thick ascending limb cells, reducing ER retention and ameliorating ER stress, inflammation, and fibrosis in ADTKD-UMOD transgenic mice.\",\n      \"method\": \"Transgenic Tg UmodC147W mice subjected to 30% calorie restriction; autophagy markers (P62, mTOR activation); ER-phagy receptor gene expression; mutant uromodulin ER retention by immunostaining; kidney function and fibrosis assessment\",\n      \"journal\": \"Journal of the American Society of Nephrology : JASN\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — mechanistic intervention study in transgenic disease model with multiple pathway readouts, single lab\",\n      \"pmids\": [\"41632531\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"Lipocalin-2 (LCN2) is induced by intracellular uromodulin aggregates and ER stress in thick ascending limb cells; stimulation of autophagy with Torin1 reduces uromodulin aggregates and attenuates LCN2 induction; genetic deletion of Lcn2 decreases interstitial iron deposition but does not alter uromodulin accumulation, inflammation, or fibrosis, indicating LCN2 is a biomarker of toxic proteinopathy but not a driver of kidney damage.\",\n      \"method\": \"Umod knock-in mouse models (C171Y, R186S, C125R); immunoblotting, immunostaining, ELISA for LCN2; Torin1 autophagy stimulation in mIMCD3 cells; Lcn2-/- x UmodR186S/+ cross; kidney function, inflammation, fibrosis assessment\",\n      \"journal\": \"Journal of the American Society of Nephrology : JASN\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 — genetic epistasis (double KO), pharmacological intervention, and multiple disease models in one study, single lab\",\n      \"pmids\": [\"41885939\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Urinary UMOD filaments naturally form salt-dependent sheet structures ('velcro sheets') that interact with uropathogenic E. coli (UPEC) type I pili; a lateral interface between UMOD polymers mediates sheet formation, and mutation of this interface disrupts UMOD filament bundle formation in mammalian cells; absence of N-terminal branches promotes stacking of UMOD sheets into thick 3D matrices.\",\n      \"method\": \"Cryo-electron tomography (cryo-ET) of urinary UMOD filaments with UPEC; single-particle cryo-electron microscopy (cryo-EM) for high-resolution structure of sheets; mutagenesis of lateral interface with functional assessment in mammalian cells; elastase treatment of UMOD\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — cryo-ET and cryo-EM structural determination with mutagenesis validation in mammalian cells, strong mechanistic insight\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"The UMOD gene (encoding uromodulin/Tamm-Horsfall glycoprotein) was chromosomally assigned to 16p13.11, with expression confirmed in mature kidney and absent in Wilms tumors.\",\n      \"method\": \"cDNA cloning, DNA sequencing, somatic cell hybrid panel hybridization for chromosomal localization, RNA expression analysis\",\n      \"journal\": \"Cytogenetics and cell genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct chromosomal mapping by somatic cell hybrid panel, tissue expression validated\",\n      \"pmids\": [\"8382593\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"IGFBP1 stabilizes Umod expression through m6A modification in bladder epithelial cells; overexpression of IGFBP1 or Umod inhibits cell apoptosis and blocks NF-κB and ERK signaling pathways, reducing pro-inflammatory cytokine production in a cystitis model.\",\n      \"method\": \"GEO transcriptome analysis; m6A modification assay; IGFBP1/Umod overexpression in primary cystitis cells; qRT-PCR, western blot; rat cystitis model with in vivo overexpression\",\n      \"journal\": \"International immunopharmacology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — m6A stabilization mechanism demonstrated in cell model but limited mechanistic depth on UMOD-specific function; bladder/cystitis context may be secondary expression\",\n      \"pmids\": [\"38759370\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"UMOD encodes uromodulin, a GPI-anchored glycoprotein exclusively expressed in the thick ascending limb of Henle's loop, where it is proteolytically cleaved and secreted as the most abundant urinary protein; disease-causing missense mutations cause misfolding and ER retention of uromodulin leading to ER stress, UPR activation, secondary mitochondrial dysfunction, and downstream inflammation and fibrosis, while wild-type uromodulin regulates sodium reabsorption by activating NKCC2 (linking it to blood pressure control), assembles into supramolecular 'velcro-like' filament sheets that trap uropathogenic E. coli via type I pili interaction (providing innate urinary tract defense), and interacts with TRPV5 to regulate calcium handling.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"UMOD encodes uromodulin (Tamm-Horsfall glycoprotein), a GPI-anchored glycoprotein exclusively expressed in the thick ascending limb of Henle's loop that is proteolytically cleaved and released as the most abundant protein in normal urine, where it assembles into filament sheets that trap uropathogenic bacteria and regulates tubular ion transport. Wild-type uromodulin activates the sodium cotransporter NKCC2 to promote salt reabsorption—linking common UMOD promoter variants to salt-sensitive hypertension—and interacts with TRPV5 to modulate renal calcium handling [PMID:24185693, PMID:35251369]. Missense mutations in UMOD, predominantly affecting cysteine residues in exon 4, cause misfolding and endoplasmic reticulum retention of uromodulin with consequent ER stress (UPR activation via BiP/CHOP), secondary mitochondrial dysfunction, inflammation, epithelial-to-myofibroblast transition, and progressive tubulointerstitial fibrosis, manifesting as autosomal dominant tubulointerstitial kidney disease (ADTKD-UMOD), including familial juvenile hyperuricaemic nephropathy and medullary cystic kidney disease type 2 [PMID:12471200, PMID:21978600, PMID:28220896, PMID:35165522]. Stimulation of autophagy promotes clearance of ER-retained mutant uromodulin aggregates and ameliorates downstream pathology in disease models [PMID:41632531, PMID:41885939].\",\n  \"teleology\": [\n    {\n      \"year\": 1993,\n      \"claim\": \"Establishing the genomic identity of UMOD: chromosomal mapping to 16p13.11 and confirmation of kidney-restricted expression provided the foundation for subsequent genetic studies.\",\n      \"evidence\": \"cDNA cloning, somatic cell hybrid panel for chromosomal localization, tissue RNA expression analysis\",\n      \"pmids\": [\"8382593\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Protein function and processing pathway not yet characterized\", \"Cell-type-specific expression within the kidney not resolved\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Identification of UMOD as the causative gene for MCKD2 and FJHN resolved the genetic basis of these autosomal dominant kidney diseases and established that missense mutations disrupt uromodulin's tertiary structure.\",\n      \"evidence\": \"DNA sequencing of UMOD in multiple affected families with segregation analysis\",\n      \"pmids\": [\"12471200\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of pathogenicity (misfolding vs. loss of function) not yet distinguished\", \"Intracellular fate of mutant protein unknown\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Demonstrating that mutant uromodulin accumulates intracellularly in thick ascending limb cells rather than reaching the apical surface established a trafficking defect as the primary cellular consequence of UMOD mutations.\",\n      \"evidence\": \"Immunostaining of renal biopsies from FJHN patients; urinary uromodulin quantification\",\n      \"pmids\": [\"14569098\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Subcellular compartment of retention not yet identified\", \"Whether accumulation is directly cytotoxic or causes loss of extracellular function was unclear\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Pinpointing the endoplasmic reticulum as the site of mutant uromodulin retention, with severity correlating to clinical phenotype, established ER retention and associated ER stress (GRP78/BiP upregulation) as the proximal disease mechanism in ADTKD-UMOD.\",\n      \"evidence\": \"In vitro cell culture trafficking assays with comparative mutations; immunohistochemistry for uromodulin and GRP78 in patient biopsies vs. controls\",\n      \"pmids\": [\"22034507\", \"21978600\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Downstream pathways connecting ER stress to tissue damage not yet mapped\", \"Whether ER stress is sufficient to cause fibrosis was untested\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Discovery that uromodulin localizes to primary cilia and that UMOD mutations reduce ciliary uromodulin expression raised the possibility of a ciliopathy component, though the functional significance of ciliary uromodulin remains unclear.\",\n      \"evidence\": \"Immunofluorescence and electron microscopy on human kidney biopsies and cell culture\",\n      \"pmids\": [\"20172860\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional role of uromodulin in cilia not established\", \"Whether ciliary loss is secondary to ER retention not resolved\", \"Single-lab observation without independent replication\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Establishing that uromodulin overexpression activates NKCC2-mediated sodium reabsorption in the thick ascending limb linked common UMOD risk variants to salt-sensitive hypertension and revealed the physiological function of secreted uromodulin in electrolyte handling.\",\n      \"evidence\": \"Transgenic mouse overexpression model; in vitro promoter assays; clinical pharmacogenomic study with loop diuretics stratified by UMOD genotype\",\n      \"pmids\": [\"24185693\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism by which uromodulin activates NKCC2 (direct interaction vs. indirect signaling) not defined\", \"Whether NKCC2 activation occurs at the cell surface or during trafficking unknown\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Proteomic and transcriptomic profiling of ADTKD-UMOD mouse kidneys revealed that ER stress from mutant uromodulin causes secondary mitochondrial dysfunction (impaired OXPHOS, reduced FIS1) and activates inflammatory and fibrotic gene programs before histological damage, establishing a temporal cascade from ER stress to tissue injury.\",\n      \"evidence\": \"Quantitative LC-MS/MS proteomics of TAL-enriched medulla; kidney transcriptional profiling at presymptomatic timepoints in Tg UmodC147W mice\",\n      \"pmids\": [\"28220896\", \"28785050\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether mitochondrial dysfunction is directly causative of fibrosis or an epiphenomenon not tested by intervention\", \"Inflammatory mediator hierarchy not resolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Multiple studies refined the disease mechanism: CHOP-mediated epithelial-to-myofibroblast transition was identified as a downstream effector of ER stress driving fibrosis; uromodulin was shown to interact with TRPV5 to regulate calcium handling; and intermediate-effect UMOD variants demonstrated a continuous spectrum of trafficking impairment and clinical severity.\",\n      \"evidence\": \"CHOP knockdown reversing EMT markers in tunicamycin-treated renal cells with patient biopsy validation; Co-IP and rescue experiments for UMOD-TRPV5 interaction; cell trafficking assays and population genetics for intermediate variant p.Thr62Pro\",\n      \"pmids\": [\"35165522\", \"35251369\", \"35947615\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"UMOD-TRPV5 interaction demonstrated by single Co-IP study without independent replication\", \"Whether CHOP is necessary in vivo for ADTKD-UMOD fibrosis not tested genetically\", \"Structural basis of UMOD-TRPV5 interaction unknown\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Cryo-EM/ET structural analysis revealed that urinary uromodulin filaments laterally associate into salt-dependent 'velcro sheets' that entrap uropathogenic E. coli via type I pili, providing a structural basis for uromodulin's role in innate urinary tract defense.\",\n      \"evidence\": \"Cryo-electron tomography of UMOD filaments with UPEC; single-particle cryo-EM of sheet structures; mutagenesis of lateral interface in mammalian cells (preprint)\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Study is a preprint awaiting peer review\", \"In vivo validation of sheet-mediated bacterial trapping not performed\", \"Whether sheet formation is required for anti-bacterial defense versus polymer formation alone not distinguished\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Autophagy stimulation (via calorie restriction or mTOR inhibition) was shown to clear ER-retained mutant uromodulin aggregates and ameliorate ER stress, inflammation, and fibrosis, while genetic deletion of the ER-stress-induced biomarker LCN2 did not prevent kidney damage, distinguishing therapeutic targets from disease biomarkers.\",\n      \"evidence\": \"Calorie restriction in Tg UmodC147W mice with autophagy and ER-phagy readouts; Torin1 treatment in mIMCD3 cells; Lcn2 knockout crossed with UmodR186S/+ knock-in mice\",\n      \"pmids\": [\"41632531\", \"41885939\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Pharmacological autophagy inducers not yet tested in clinical trials for ADTKD-UMOD\", \"Whether ER-phagy versus bulk autophagy is the operative clearance pathway not genetically dissected\", \"Long-term efficacy and safety of calorie restriction in patients unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The molecular mechanism by which secreted uromodulin activates NKCC2, the structural basis of the UMOD-TRPV5 interaction, and whether pharmacological autophagy induction can treat ADTKD-UMOD in humans remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No direct binding site or activation mechanism for uromodulin-NKCC2 interaction defined\", \"No high-resolution structure of full-length membrane-anchored uromodulin\", \"No clinical trial data for autophagy-based therapy in ADTKD-UMOD\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [6, 13]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [16]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [3, 4, 5, 11]},\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [0, 1, 16]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 6]},\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [2]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-382551\", \"supporting_discovery_ids\": [6, 13]},\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [4, 7, 12, 14]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [8, 16]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [14, 15]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [0, 1, 3, 4, 7, 12]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"SLC12A1\",\n      \"TRPV5\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}