{"gene":"MIB1","run_date":"2026-04-28T18:30:28","timeline":{"discoveries":[{"year":2013,"finding":"MIB1 encodes an E3 ubiquitin ligase that promotes endocytosis of NOTCH ligands DELTA and JAGGED, and functions as a dimer; germline mutations in MIB1 that disrupt dimerization cause left ventricular noncompaction cardiomyopathy (LVNC). Targeted inactivation of Mib1 in mouse myocardium abolishes ventricular Notch1 activity, causing LVNC with expansion of compact myocardium into proliferative, immature trabeculae.","method":"Human genetics (autosomal-dominant pedigrees), mouse conditional knockout, zebrafish embryo functional assays, in silico modeling, reporter assays for NOTCH1 target gene expression","journal":"Nature medicine","confidence":"High","confidence_rationale":"Tier 1-2 — multiple orthogonal methods (human genetics + mouse KO + zebrafish + reporter assays), replicated across species, strong evidence for dimerization and Notch ligand endocytosis","pmids":["23314057"],"is_preprint":false},{"year":2007,"finding":"Zebrafish Mib and Mib2 are reciprocal E3 ubiquitin ligases and substrates of each other; they function redundantly in Notch signaling using DeltaC as a common substrate. The C-terminal RING finger domain is required for E3 ubiquitin ligase activity. Mib ubiquitinates and promotes endocytosis of Delta ligands to activate Notch signaling; loss-of-function (null) mib alleles abolish Notch signaling in zebrafish embryos. Antimorphic missense (M1013R) or truncation (C785stop) mutations in the RING finger act dominant-negatively on both Mib and Mib2.","method":"In vivo zebrafish genetics (null and antimorphic alleles), co-transfection ubiquitylation assays, Delta internalization assays, domain deletion analysis","journal":"Developmental biology","confidence":"High","confidence_rationale":"Tier 1-2 — multiple alleles with in vivo epistasis, biochemical ubiquitination and internalization assays, strong evidence across two papers","pmids":["17331493","17196985"],"is_preprint":false},{"year":2006,"finding":"Zebrafish Mib and Mib2 have C-terminal RING finger-dependent E3 ubiquitin ligase activity; they are mutual substrates of each other. While both ubiquitylate DeltaC as a common substrate, Mib2 differs from Mib in its ability to promote DeltaD internalization. Mib and Mib2 bind differently to extracellular and intracellular portions of DeltaA and DeltaC.","method":"In vitro and cell-based ubiquitination assays, endocytosis/internalization assays, co-immunoprecipitation, domain mapping","journal":"Journal of molecular biology","confidence":"High","confidence_rationale":"Tier 1-2 — biochemical reconstitution of E3 activity with domain mutants, multiple substrates tested","pmids":["17196985"],"is_preprint":false},{"year":2015,"finding":"MIB1 interacts with Polo-like kinase 4 (Plk4) and localizes to centriolar satellites; upon conditions inducing centriole amplification, MIB1 redistributes to centrioles. MIB1 E3 ligase activity triggers ubiquitylation of Plk4 on multiple sites, generating Lys11-, Lys29-, and Lys48-linked ubiquitin chains, which controls Plk4 abundance and its interaction with centrosomal proteins, thereby counteracting Plk4-induced centriole amplification.","method":"Co-immunoprecipitation, mass spectrometry, in vitro and cell-based ubiquitination assays with linkage-specific analysis, MIB1 E3 ligase mutants, live imaging of centriole amplification","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 1-2 — direct biochemical identification of Plk4 ubiquitylation sites and linkage types, E3 ligase mutant validation, subcellular localization with functional consequence","pmids":["25795303"],"is_preprint":false},{"year":2012,"finding":"Mib1 is an E3 ubiquitin ligase that ubiquitinates and promotes endocytosis of Notch ligands in the developing spinal cord. Conditional knockout of Mib1 in mouse spinal cord causes depletion of progenitors, premature neuronal differentiation, and imbalanced V2 interneuron specification—phenotypes identical to Notch loss of function. Late removal of Mib1 specifically suppresses gliogenesis. The RING domain of Mib1 is required for V2 interneuron specification in chick neural tube.","method":"Conditional mouse knockout, drug-inducible deletion, chick in ovo electroporation with Mib1 deletion mutants, immunofluorescence for progenitor and neuronal markers","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — conditional KO with defined cellular phenotypes, domain mutagenesis in vivo, epistasis with Notch pathway","pmids":["23223237"],"is_preprint":false},{"year":2016,"finding":"MicroRNA-10a/10b directly target the 3′-UTR of mib1 mRNA to suppress its expression. Loss of miR-10a/10b impairs blood vessel outgrowth (tip cell behavior) in zebrafish, and this phenotype is rescued by inhibition of mib1 or Notch signaling, placing Mib1 downstream of miR-10 in regulating angiogenesis in a Notch-dependent manner.","method":"In vitro luciferase reporter assay (miR-10 binding to mib1 3′-UTR), in vivo zebrafish reporter assay, morpholino knockdown of miR-10a/10b, mib1 inhibition rescue experiments","journal":"Cardiovascular research","confidence":"Medium","confidence_rationale":"Tier 2 — direct 3′-UTR luciferase validation and in vivo rescue, single lab","pmids":["26825552"],"is_preprint":false},{"year":2019,"finding":"The tumor suppressor CYLD deubiquitinating enzyme directly deubiquitinates MIB1 to prevent MIB1 from ubiquitinating PCM1 (pericentriolar material protein 1) for proteasomal degradation. CYLD knockdown promotes PCM1 degradation, dismantles centriolar satellites, and impairs ciliogenesis; these effects are mediated through unchecked MIB1 E3 ligase activity.","method":"Proteomic screen (CYLD interactors), co-immunoprecipitation, ubiquitination assays, proteasome inhibitor rescue, siRNA knockdown, ciliogenesis assays","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 — unbiased proteomic screen followed by mechanistic biochemical validation, multiple orthogonal methods, defined pathway placement","pmids":["31067453"],"is_preprint":false},{"year":2019,"finding":"SNX17 recruits the deubiquitinase USP9X to antagonize MIB1-induced ubiquitination and proteasomal degradation of PCM1 specifically during serum-starvation-induced ciliogenesis. SNX17 deficiency leads to enhanced degradation of both USP9X and PCM1 and disrupts ciliogenesis. The SNX17/USP9X axis is dispensable for PCM1 homeostasis in serum-containing media, indicating context-specific regulation of MIB1 activity.","method":"Co-immunoprecipitation, ubiquitination assays, siRNA knockdown, ciliogenesis assays, proteasome inhibitor treatment","journal":"Cells","confidence":"Medium","confidence_rationale":"Tier 2 — mechanistic biochemical validation of the SNX17/USP9X/MIB1/PCM1 axis, single lab","pmids":["31671755"],"is_preprint":false},{"year":2017,"finding":"Mib1 ubiquitin ligase ubiquitinates Ctnnd1 (p120-catenin) at K547, which attenuates Rac1 activation in cultured cells. This Mib1-Ctnnd1-Rac1 pathway regulates persistent directional cell migration: MIB1 knockdown in HeLa cells increases random migration, and mib1 mutant zebrafish posterior lateral line primordium cells show increased random migration and loss of directional F-actin protrusions. Ctnnd1 knockdown partially rescues migration defects in mib1 mutant zebrafish.","method":"siRNA knockdown wound-closure assay, ubiquitination assays with site-specific mutagenesis (K547), Rac1 activity assay, zebrafish lateral line primordium live imaging, genetic rescue","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1-2 — site-specific ubiquitination mapping, Rac1 activity assay, in vivo zebrafish rescue, multiple orthogonal methods","pmids":["29078376"],"is_preprint":false},{"year":2021,"finding":"MIB1 targets ST7 (suppressor of tumorigenicity 7) for ubiquitin-mediated proteasomal degradation in pancreatic cancer cells. ST7 normally suppresses tumor growth by downregulating IQGAP1; MIB1-mediated ST7 degradation relieves this suppression, thereby upregulating IQGAP1 and promoting proliferation and invasion.","method":"Co-immunoprecipitation, ubiquitination assays, proteasome inhibitor treatment, siRNA knockdown and overexpression, in vitro and xenograft in vivo proliferation/invasion assays","journal":"Molecular oncology","confidence":"Medium","confidence_rationale":"Tier 2 — direct biochemical demonstration of MIB1-ST7 interaction and degradation, in vitro and in vivo phenotypes, single lab","pmids":["33793053"],"is_preprint":false},{"year":2023,"finding":"MIB1 directly interacts with TOP3B (independently of TDRD3) and mediates its ubiquitylation and proteasomal degradation. The TDRD3-USP9X deubiquitinase complex acts downstream of MIB1 to stabilize TOP3B; depletion of TDRD3 increases TOP3B cleavage complexes (TOP3Bccs) in DNA and RNA, R-loops, γH2AX, and growth defects.","method":"Co-immunoprecipitation, ubiquitination assays, siRNA knockdown (USP9X, TDRD3, MIB1), TOP3Bcc measurement in DNA and RNA, R-loop detection, γH2AX immunofluorescence","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1-2 — direct biochemical identification of MIB1-TOP3B interaction and ubiquitylation, multiple genetic perturbations, functional consequences measured, published in high-impact journal","pmids":["37980342"],"is_preprint":false},{"year":2023,"finding":"MIB1 ubiquitinates DAPK1 (death-associated protein kinase 1) to promote its proteasomal degradation in glioblastoma cells. The natural compound sanggenon C suppresses MIB1 expression, leading to DAPK1 stabilization, reduced cell proliferation, and induced apoptosis in GBM cells; MIB1 overexpression reverses these effects.","method":"Quantitative proteomics, western blotting, siRNA/overexpression, ubiquitination assays, in vitro and in vivo GBM tumor models","journal":"MedComm","confidence":"Medium","confidence_rationale":"Tier 2 — proteomic identification with biochemical validation of MIB1-DAPK1 ubiquitination axis, functional rescue experiments, single lab","pmids":["37346933"],"is_preprint":false},{"year":2018,"finding":"Human MIB1 pathological variants (p.T312Kfs*55 and p.W271G) identified in congenital heart disease patients significantly reduce MIB1 function, resulting in lower levels of JAGGED1 (JAG1) ubiquitination and reduced Notch signaling induction, demonstrating that MIB1-mediated ubiquitination of JAG1 is required for proper Notch pathway activation.","method":"Exome sequencing in CHD cohort, biochemical ubiquitination assays, Notch reporter assays, overexpression of mutant vs. wild-type MIB1","journal":"Clinical science","confidence":"Medium","confidence_rationale":"Tier 2 — direct biochemical demonstration that specific human mutations reduce JAG1 ubiquitination and Notch signaling, multiple mutations tested","pmids":["30322850"],"is_preprint":false},{"year":2023,"finding":"MIB1 variants are associated with nonsyndromic bicuspid aortic valve (nsBAV). Two mouse models carrying Mib1 variants identified in human BAV patients develop bicuspid aortic valve on a NOTCH1-sensitized background, confirming that reduced MIB1 function impairs NOTCH pathway activity during aortic valve development.","method":"Familial exome sequencing and rare variant association, genetically modified mouse models on NOTCH1-sensitized background, cardiac phenotyping","journal":"JAMA cardiology","confidence":"Medium","confidence_rationale":"Tier 2 — genetic association with in vivo mouse model validation of functional consequence, NOTCH1 sensitization epistasis","pmids":["37405741"],"is_preprint":false},{"year":2019,"finding":"miR-198 directly targets MIB1 mRNA, and knockdown of MIB1 recapitulates the effects of miR-198 overexpression: reduced proliferation, G0/G1 cell cycle arrest, impaired colony formation, and reduced in vivo tumor formation in LNCaP xenografts, establishing MIB1 as a pro-tumorigenic factor in prostate cancer.","method":"Luciferase reporter assay validating miR-198 binding to MIB1 3′-UTR, siRNA knockdown of MIB1, proliferation/cell cycle/colony formation assays, LNCaP xenograft model","journal":"Oncology reports","confidence":"Medium","confidence_rationale":"Tier 2-3 — direct 3′-UTR validation and phenotypic rescue by MIB1 knockdown, in vivo tumor model, single lab","pmids":["31322262"],"is_preprint":false},{"year":2023,"finding":"SNORA73B snoRNA modifies MIB1 mRNA by increasing its pseudouridine content, thereby stabilizing MIB1 mRNA and protein. Elevated MIB1 in turn increases ubiquitination of JAG1 and activates the Notch pathway to promote endometrial cancer progression. SNORA73B also regulates alternative splicing of RCC1 independent of MIB1.","method":"HPLC pseudouridine detection, actinomycin D mRNA stability assay, co-immunoprecipitation (JAG1 ubiquitination), RNA-seq, siRNA knockdown, xenograft model","journal":"Journal of cellular and molecular medicine","confidence":"Medium","confidence_rationale":"Tier 2 — multiple biochemical methods validating MIB1 mRNA stabilization and downstream JAG1 ubiquitination, functional in vivo experiments, single lab","pmids":["37488742"],"is_preprint":false}],"current_model":"MIB1 is a RING-domain E3 ubiquitin ligase that functions as a dimer and promotes the ubiquitination and endocytosis of NOTCH ligands (DELTA, JAGGED1) in signal-sending cells to activate NOTCH signaling in adjacent cells, with established roles in cardiac trabeculation, neurogenesis, gliogenesis, and angiogenesis; beyond Notch, MIB1 ubiquitinates additional substrates including Plk4 (controlling centriole homeostasis), PCM1 (regulating centriolar satellite proteostasis and ciliogenesis, counteracted by CYLD and the SNX17-USP9X complex), Ctnnd1/p120-catenin (suppressing Rac1 activity to direct persistent cell migration), ST7 (promoting pancreatic cancer progression via IQGAP1), TOP3B (preventing accumulation of deleterious topoisomerase cleavage complexes, counteracted by the TDRD3-USP9X complex), and DAPK1 (in glioblastoma)."},"narrative":{"teleology":[{"year":2006,"claim":"Establishing MIB1 as a RING-finger-dependent E3 ubiquitin ligase that ubiquitinates Delta-family Notch ligands and promotes their endocytosis resolved how ligand-presenting cells generate the mechanical or endocytic force required for Notch activation.","evidence":"In vitro and cell-based ubiquitination assays with RING domain mutants, Delta internalization assays, and genetic analysis of zebrafish mib null and antimorphic alleles","pmids":["17196985","17331493"],"confidence":"High","gaps":["Crystal structure of MIB1 RING–substrate complex not determined","Precise mechanism by which ligand ubiquitination enables Notch activation (pulling force vs. recycling) unresolved"]},{"year":2012,"claim":"Conditional knockout studies in mouse demonstrated that MIB1's E3 ligase activity is required in vivo for maintaining neural progenitor pools, specifying V2 interneurons, and promoting gliogenesis—all via Notch pathway activation—extending MIB1 function beyond early embryonic patterning to tissue-specific developmental roles.","evidence":"Conditional and inducible Mib1 knockout in mouse spinal cord, chick neural tube electroporation with RING deletion mutants","pmids":["23223237"],"confidence":"High","gaps":["Whether MIB1 substrates other than Delta/Jagged contribute to neural phenotypes is untested","Relative contributions of MIB1 vs. MIB2 in mammalian neurogenesis not fully delineated"]},{"year":2013,"claim":"The discovery that MIB1 dimerization is essential for function and that dimerization-disrupting mutations cause left ventricular noncompaction cardiomyopathy established MIB1 as a Mendelian disease gene and linked its Notch ligand-ubiquitinating activity to human cardiac development.","evidence":"Human autosomal-dominant pedigrees, mouse cardiac-specific Mib1 knockout, zebrafish rescue, Notch1 reporter assays","pmids":["23314057"],"confidence":"High","gaps":["Structural basis of dimerization not resolved at atomic level","Whether dimerization-deficient MIB1 retains residual activity toward non-Notch substrates unknown"]},{"year":2015,"claim":"Identification of Plk4 as a MIB1 substrate at centriolar satellites, with Lys11/29/48-linked ubiquitin chains controlling Plk4 abundance, revealed a Notch-independent role for MIB1 in centriole copy-number control.","evidence":"Mass spectrometry–based ubiquitin linkage analysis, co-immunoprecipitation, E3 ligase-dead mutants, live imaging of centriole amplification","pmids":["25795303"],"confidence":"High","gaps":["In vivo physiological consequence of MIB1-Plk4 axis (e.g., in cycling tissues) not shown","Whether MIB1 is the primary E3 for Plk4 or one of several is unclear"]},{"year":2017,"claim":"Demonstration that MIB1 ubiquitinates p120-catenin (Ctnnd1) at K547 to suppress Rac1 and enforce directional migration uncovered a Notch-independent cytoskeletal function, validated by rescue of zebrafish lateral line primordium migration defects.","evidence":"Site-directed mutagenesis (K547), Rac1 activity pulldown, wound-healing and zebrafish primordium live imaging, genetic epistasis","pmids":["29078376"],"confidence":"High","gaps":["Whether Ctnnd1 ubiquitination is degradative or regulatory (signaling-type) not fully resolved","Upstream signals directing MIB1 toward Ctnnd1 vs. Delta/Jagged unknown"]},{"year":2019,"claim":"Two independent studies showed that MIB1 ubiquitinates PCM1 for proteasomal degradation at centriolar satellites, and that the deubiquitinases CYLD and USP9X (recruited by SNX17) counteract MIB1 to preserve PCM1 and enable ciliogenesis, establishing a ubiquitin-balance mechanism for centriolar satellite homeostasis.","evidence":"Proteomic screen for CYLD interactors, co-immunoprecipitation, ubiquitination assays, siRNA knockdown, proteasome inhibitor rescue, ciliogenesis quantification","pmids":["31067453","31671755"],"confidence":"High","gaps":["Whether MIB1 targets other satellite proteins besides PCM1 untested","How serum starvation specifically activates the SNX17-USP9X protective axis mechanistically unclear"]},{"year":2018,"claim":"Clinical variants in MIB1 found in congenital heart disease patients were shown biochemically to reduce JAG1 ubiquitination and Notch signaling, and separately, Mib1 variants on a NOTCH1-sensitized mouse background produce bicuspid aortic valve, broadening the spectrum of MIB1-associated cardiac disease.","evidence":"Exome sequencing in CHD/BAV cohorts, ubiquitination assays with mutant MIB1, Notch reporter assays, genetically modified mice on Notch1+/− background","pmids":["30322850","37405741"],"confidence":"Medium","gaps":["Penetrance and expressivity modifiers in human populations not identified","Whether additional MIB1 substrates contribute to valve development is unknown"]},{"year":2023,"claim":"MIB1 was found to ubiquitinate TOP3B independently of TDRD3, targeting it for proteasomal degradation; the TDRD3–USP9X complex opposes this, and failure of this balance leads to accumulation of TOP3B cleavage complexes, R-loops, and DNA damage, extending MIB1 function to genome stability.","evidence":"Co-immunoprecipitation, ubiquitination assays, siRNA depletion of MIB1/TDRD3/USP9X, TOP3Bcc and R-loop quantification, γH2AX detection","pmids":["37980342"],"confidence":"High","gaps":["Whether MIB1-TOP3B axis operates in specific tissues or cell-cycle phases not determined","Direct in vivo phenotypic consequences of deregulated TOP3B turnover via MIB1 not shown"]},{"year":2023,"claim":"Identification of DAPK1 and ST7 as MIB1 degradation targets in glioblastoma and pancreatic cancer, respectively, implicated MIB1 E3 ligase activity in oncogenic signaling beyond Notch, though these substrates were each characterized in single-lab studies.","evidence":"Quantitative proteomics, ubiquitination assays, siRNA/overexpression rescue, xenograft tumor models","pmids":["37346933","33793053"],"confidence":"Medium","gaps":["DAPK1 and ST7 as MIB1 substrates each reported by single laboratories and await independent confirmation","Whether MIB1 targeting of DAPK1/ST7 occurs in non-cancer contexts is unknown","Substrate selectivity determinants for MIB1 among its growing list of targets remain uncharacterized"]},{"year":null,"claim":"Key unresolved questions include the structural basis of MIB1 dimerization and substrate selectivity, how MIB1 is directed toward its diverse substrates in different cellular contexts, and whether additional disease-associated substrates exist beyond Notch ligands.","evidence":"","pmids":[],"confidence":"High","gaps":["No high-resolution structure of full-length MIB1 or its dimer interface","Regulatory inputs that switch MIB1 substrate preference (Notch ligands vs. PCM1 vs. Plk4 vs. Ctnnd1 vs. TOP3B) are undefined","Systematic substrate profiling has not been performed"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,1,2,3,4,6,7,8,9,10,11,12]},{"term_id":"GO:0016874","term_label":"ligase activity","supporting_discovery_ids":[0,1,2,3,6,8,10]}],"localization":[{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[3,6,7]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[1,2,8]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,1,2,4,5,12,13,15]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[0,1,3,6,8,10,11]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[0,4,13]},{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[3,6,7]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[9,11,14]}],"complexes":[],"partners":["DLL1","JAG1","PLK4","PCM1","CTNND1","TOP3B","CYLD","USP9X"],"other_free_text":[]},"mechanistic_narrative":"MIB1 is a RING-domain E3 ubiquitin-protein ligase that functions as a dimer and plays a central role in Notch pathway activation by ubiquitinating the Notch ligands Delta and Jagged in signal-sending cells, thereby promoting their endocytosis and enabling productive Notch receptor engagement in neighboring cells [PMID:23314057, PMID:17331493, PMID:30322850]. Beyond Notch, MIB1 ubiquitinates diverse substrates to control centriole homeostasis (Plk4), centriolar satellite integrity and ciliogenesis (PCM1, counteracted by CYLD and the SNX17–USP9X axis), directional cell migration (Ctnnd1/p120-catenin–Rac1 axis), and topoisomerase III beta proteostasis (TOP3B, counteracted by the TDRD3–USP9X complex) [PMID:25795303, PMID:31067453, PMID:29078376, PMID:37980342]. Germline loss-of-function or dimerization-disrupting mutations in MIB1 cause left ventricular noncompaction cardiomyopathy and contribute to congenital heart defects including bicuspid aortic valve through impaired Notch signaling during cardiac development [PMID:23314057, PMID:37405741]. In cancer contexts, MIB1-mediated degradation of ST7 and DAPK1 promotes pancreatic cancer and glioblastoma cell proliferation, respectively [PMID:33793053, PMID:37346933]."},"prefetch_data":{"uniprot":{"accession":"Q86YT6","full_name":"E3 ubiquitin-protein ligase MIB1","aliases":["DAPK-interacting protein 1","DIP-1","Mind bomb homolog 1","RING-type E3 ubiquitin transferase MIB1","Zinc finger ZZ type with ankyrin repeat domain protein 2"],"length_aa":1006,"mass_kda":110.1,"function":"E3 ubiquitin-protein ligase that mediates ubiquitination of Delta receptors, which act as ligands of Notch proteins. Positively regulates the Delta-mediated Notch signaling by ubiquitinating the intracellular domain of Delta, leading to endocytosis of Delta receptors. Probably mediates ubiquitination and subsequent proteasomal degradation of DAPK1, thereby antagonizing anti-apoptotic effects of DAPK1 to promote TNF-induced apoptosis (By similarity). 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Targeted inactivation of Mib1 in mouse myocardium or of myocardial Jagged1/endocardial Notch1 produces the same phenotype, placing MIB1 upstream of Notch1 in cardiac trabecular compaction.\",\n      \"method\": \"Germline human mutation analysis, cell-based functional assays, zebrafish embryo rescue experiments, in silico modeling, conditional mouse Mib1 knockout with cardiac phenotype readout\",\n      \"journal\": \"Nature medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal methods (human genetics, zebrafish, conditional mouse KO, in silico) across a single study with rigorous controls\",\n      \"pmids\": [\"23314057\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"The E3 ubiquitin ligase MIB1 interacts with Polo-like kinase 4 (PLK4) and triggers its ubiquitylation on multiple sites, forming Lys11-, Lys29-, and Lys48-linked ubiquitin chains that control PLK4 abundance and its interactions with centrosomal proteins, thereby counteracting centriole amplification. MIB1 localizes to centriolar satellites under normal conditions but redistributes to centrioles when centriole amplification is induced.\",\n      \"method\": \"Co-immunoprecipitation, mass spectrometry, ubiquitylation assays, immunofluorescence/live imaging localization, overexpression and knockdown with centriole number readout\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP, MS, in-cell ubiquitylation assays, and direct localization experiment with functional consequence in a single study\",\n      \"pmids\": [\"25795303\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"The deubiquitinase CYLD antagonizes MIB1-mediated ubiquitination and proteasomal degradation of the centriolar satellite scaffold protein PCM1; loss of CYLD allows MIB1 to mark PCM1 for degradation, dismantling centriolar satellites and impairing ciliogenesis.\",\n      \"method\": \"Unbiased proteomic screen for CYLD binding partners, Co-IP, CYLD knockdown with PCM1 degradation readout, rescue experiments, ubiquitination assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — proteomics discovery followed by Co-IP, KD/KO with defined molecular phenotype, and rescue, moderate-to-strong evidence from a single lab\",\n      \"pmids\": [\"31067453\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"SNX17 recruits the deubiquitinase USP9X to antagonize MIB1-induced ubiquitination and proteasomal degradation of PCM1 during serum-starvation-induced ciliogenesis; SNX17 deficiency enhances MIB1-dependent PCM1 degradation and disrupts ciliogenesis.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assays, knockdown of SNX17/USP9X with PCM1 stability and ciliogenesis readouts\",\n      \"journal\": \"Cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — Co-IP and KD with functional readout, single lab\",\n      \"pmids\": [\"31671755\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"MIB1 ubiquitinates Ctnnd1 (p120-catenin) on Lys547, which attenuates Rac1 activation, promotes persistent directional cell migration, and restrains random migration; this Mib1-Ctnnd1-Rac1 pathway was validated in HeLa cells and in zebrafish posterior lateral line primordium.\",\n      \"method\": \"shRNA knockdown wound-closure assay, substrate identification, site-directed mutagenesis of Ctnnd1 K547, Rac1 activity assays, zebrafish mib1 mutant live imaging and Ctnnd1 rescue\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — mutagenesis of ubiquitination site, biochemical assays, and in vivo genetic rescue in zebrafish, multiple orthogonal methods\",\n      \"pmids\": [\"29078376\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"MIB1 directly interacts with and mediates ubiquitylation and proteasomal degradation of TOP3B independently of TDRD3; the TDRD3-USP9X deubiquitinase complex counteracts this MIB1-dependent degradation to stabilize TOP3B and prevent deleterious TOP3B cleavage complexes.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitylation assays, USP9X/TDRD3/MIB1 knockdown with TOP3B stability and TOP3B cleavage complex readouts, biochemical turnover experiments\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP, ubiquitylation assay, triple KD epistasis, biochemical reconstitution in a single study\",\n      \"pmids\": [\"37980342\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"MIB1 promotes pancreatic cancer progression by targeting the tumor suppressor ST7 for proteasomal degradation; loss of ST7 leads to upregulation of IQGAP1, enhancing tumor cell proliferation and invasion (MIB1/ST7/IQGAP1 axis).\",\n      \"method\": \"MIB1 overexpression and knockdown in pancreatic cancer cell lines and xenografts, ubiquitylation/degradation assays, western blot, in vitro and in vivo proliferation/invasion assays\",\n      \"journal\": \"Molecular oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — KO/OE with defined molecular pathway and in vivo validation, single lab\",\n      \"pmids\": [\"33793053\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"MIB1 (Mind bomb-1) E3 ubiquitin ligase ubiquitinates and promotes endocytosis of Notch ligands to activate Notch signaling in the developing spinal cord; conditional Mib1 knockout in mice depletes spinal progenitors, causes premature neuronal differentiation, unbalanced V2 interneuron specification, and subsequent loss of astrocytes and oligodendrocytes. The RING domain of Mib1 is required for V2 interneuron specification.\",\n      \"method\": \"Conditional knockout mice, drug-inducible Mib1 deletion, chick neural tube misexpression of Mib1 deletion mutants, progenitor/interneuron marker analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with specific cellular phenotype, domain deletion experiments, and inducible system for temporal dissection, single lab but multiple orthogonal approaches\",\n      \"pmids\": [\"23223237\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Zebrafish Mib and Mib2 are reciprocal E3 ubiquitin ligases and substrates; both use the C-terminal RING finger for E3 ligase activity. They share DeltaC as a common ubiquitination substrate but differ in DeltaD internalization; antimorphic Mib mutants competitively inhibit Mib2-mediated DeltaC ubiquitylation.\",\n      \"method\": \"In vitro ubiquitylation assays, transfection co-localization, Delta internalization assays, domain deletion and missense mutagenesis of RING fingers\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro ubiquitylation assay plus mutagenesis, replicated across multiple alleles\",\n      \"pmids\": [\"17196985\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Zebrafish mib(ta52b) (C-terminal RING finger missense M1013R) and mib(m132) (truncation removing all three RING fingers) are antimorphic alleles; Mib and Mib2 co-localize and function redundantly in Notch signaling, and mutant Mib proteins exert dominant-negative effects on Mib2 in a dosage-dependent manner; Notch signaling negatively regulates mib expression via Su(H), forming a negative feedback loop.\",\n      \"method\": \"Allelic series analysis, genetic epistasis in zebrafish embryos, co-transfection localization, Delta ubiquitylation and endocytosis assays\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — allelic series with multiple orthogonal methods, epistasis, and co-localization with functional validation\",\n      \"pmids\": [\"17331493\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"miR-10a/10b directly target the 3'-UTR of mib1 mRNA, reducing MIB1 protein levels; loss of miR-10a/10b impairs angiogenic tip cell behavior, and inhibition of mib1 or Notch signaling rescues the vascular defects in miR-10-deficient zebrafish, placing MIB1 downstream of miR-10 and upstream of Notch in angiogenesis.\",\n      \"method\": \"Deep sequencing, Taqman PCR, in situ hybridization, luciferase reporter assay for miR-10/mib1 3'-UTR interaction, in vivo reporter assay in zebrafish, mib1 morpholino rescue experiment\",\n      \"journal\": \"Cardiovascular research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — luciferase reporter plus in vivo rescue, single lab\",\n      \"pmids\": [\"26825552\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Two CHD-associated MIB1 mutations (p.T312Kfs*55 and p.W271G) significantly reduce MIB1's ability to ubiquitinate JAGGED1 (JAG1) and diminish downstream Notch signaling induction in biochemical assays, supporting MIB1's role as an activator of Notch signaling through JAG1 ubiquitination.\",\n      \"method\": \"Identification of rare heterozygous mutations in CHD patients, in vitro ubiquitination assays of JAG1, Notch signaling reporter assays\",\n      \"journal\": \"Clinical science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — in vitro ubiquitination assay plus signaling reporter for specific mutants, single lab\",\n      \"pmids\": [\"30322850\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"MIB1 variants associated with non-syndromic bicuspid aortic valve (nsBAV) were validated in genetically modified mice on a NOTCH1-sensitized background, which displayed BAV, confirming that MIB1 function in Notch pathway activation is required for aortic valve morphogenesis.\",\n      \"method\": \"Familial exome sequencing, rare variant enrichment analysis, two independent mouse models carrying human MIB1 variants on NOTCH1-sensitized background\",\n      \"journal\": \"JAMA cardiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — human genetic association replicated in two in vivo mouse models with specific cardiac structural phenotype\",\n      \"pmids\": [\"37405741\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"SNORA73B increases MIB1 mRNA stability by modifying pseudouridine content within MIB1 mRNA, thereby elevating MIB1 protein levels; elevated MIB1 in turn increases JAG1 ubiquitination and activates the Notch pathway to promote endometrial cancer progression.\",\n      \"method\": \"HPLC pseudouridine detection, mRNA stability assay with actinomycin D, co-immunoprecipitation for JAG1 ubiquitination, RNA-seq, in vitro and xenograft functional assays\",\n      \"journal\": \"Journal of cellular and molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — biochemical mechanistic link (pseudouridine modification → mRNA stability → ubiquitination) supported by multiple methods but single lab\",\n      \"pmids\": [\"37488742\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"MIB1 mediates ubiquitination and proteasomal degradation of DAPK1; the flavonoid sanggenon C suppresses GBM proliferation and induces apoptosis by decreasing MIB1 expression, thereby preventing MIB1-dependent DAPK1 degradation.\",\n      \"method\": \"Quantitative proteomics, western blot, MIB1 overexpression/knockdown with DAPK1 stability readout, rescue experiments in GBM cells and in vivo\",\n      \"journal\": \"MedComm\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — proteomic discovery plus KD/OE rescue, single lab\",\n      \"pmids\": [\"37346933\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"miR-198 directly targets MIB1 mRNA (validated by luciferase reporter assay); MIB1 knockdown recapitulates miR-198 overexpression effects—reduced proliferation, G0/G1 arrest, impaired colony formation, and decreased tumor formation in vivo—establishing MIB1 as a functional target of miR-198 in prostate cancer.\",\n      \"method\": \"Luciferase reporter assay, miR-198 mimic transfection, MIB1 siRNA knockdown, proliferation/cell cycle/colony assays, LNCaP xenograft model\",\n      \"journal\": \"Oncology reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — luciferase validation plus KD phenotype rescue, single lab\",\n      \"pmids\": [\"31322262\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"MIB1 is a RING-domain E3 ubiquitin ligase that functions as a dimer to ubiquitinate Notch ligands (Delta, Jagged/JAG1), promoting their endocytosis and thereby activating Notch signaling in signal-sending cells; beyond Notch regulation, MIB1 ubiquitinates additional substrates including PLK4 (to limit centriole amplification), PCM1 (controlling centriolar satellite homeostasis and ciliogenesis, antagonized by CYLD/USP9X), Ctnnd1/p120-catenin (attenuating Rac1 to direct persistent cell migration), TOP3B (targeting it for proteasomal degradation, counteracted by TDRD3-USP9X), ST7 (promoting pancreatic cancer progression via IQGAP1), and DAPK1 (whose stabilization suppresses glioblastoma growth).\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\nI'll systematically classify each paper before extracting discoveries.\n\n**Classification of Retrieved Papers:**\n\nPapers clearly about MIB1 (canonical E3 ubiquitin ligase, Notch pathway):\n- PMID:23314057 - KEEP (MIB1 mutations, LVNC, Notch)\n- PMID:25795303 - KEEP (Mib1 regulates Plk4, centriole biogenesis)\n- PMID:26825552 - KEEP (miR-10 targets mib1 in angiogenesis)\n- PMID:17331493 - KEEP (zebrafish mib/mib2 E3 ubiquitin ligases)\n- PMID:17196985 - KEEP (zebrafish Mib and Mib2 E3 ligases)\n- PMID:23223237 - KEEP (Mib1 in neurogenesis/gliogenesis, spinal cord)\n- PMID:31067453 - KEEP (CYLD counteracts MIB1 ubiquitination of PCM1)\n- PMID:29078376 - KEEP (Mib1 regulates Ctnnd1-Rac1 pathway, cell migration)\n- PMID:33793053 - KEEP (MIB1 targets ST7 for degradation in pancreatic cancer)\n- PMID:31671755 - KEEP (SNX17/USP9X antagonize MIB1-mediated PCM1 degradation)\n- PMID:37980342 - KEEP (MIB1 mediates TOP3B ubiquitylation/degradation)\n- PMID:37346933 - KEEP (MIB1/DAPK1 axis in glioblastoma)\n- PMID:30322850 - KEEP (MIB1 mutations reduce Notch signaling, CHD)\n- PMID:37405741 - KEEP (MIB1 gene association with bicuspid aortic valve)\n- PMID:31322262 - KEEP (miR-198 targets MIB1 in prostate cancer)\n- PMID:37488742 - KEEP (SNORA73B targets MIB1 mRNA stability)\n\nPapers about MIB-1 antibody/Ki-67 (proliferation marker, NOT the gene MIB1):\n- PMIDs: 27976886, 26477565, 22492957, 7982181, 8620403, 7860043, 9763029, 10396237, 7890504, 9865827, 10955790, 11914620, 18552822, 27114507, 10326705, 9495200, 12945944, 8998857, 10320142, 9128986, 9990108, 8816883, 7890231, 9495200, 8641618, 9265953, 9583887, 9267818, 10953132, 7647938, 9584322, 10504552, 10410171, 27490759, 8852445, 10872657, 11550800, 9680380, 7873301, 10729919, 9959108, 17295643, 9375023, 9796723, 8947051 (MITF Mi(b) mutation - EXCLUDE, different gene), 10926326, 15643503, 9656259, 9860257, 14726819, 17464313, 17885502, 19832838, 26995334, 9522215, 10545794, 15925772, 17350668, 23202049, 20544708, 23030396, 12465771, 22234091, 16097446, 14534689, 20819770, 12616468, 12015737, 12468125 — ALL EXCLUDE (Ki-67/proliferation marker context)\n\n- PMID:27914726, 34593182, 34757030, 37611357 — EXCLUDE (2-MIB chemical compound)\n- PMID:26477565, 34385433 — EXCLUDE (MICOS-MIB mitochondrial complex)\n- PMID:7225079 — EXCLUDE (Pep-3 dipeptidase in rat)\n\n**Additional curated papers (gene2pubmed):**\n- Most are large proteomics/interactome studies that detect MIB1 incidentally → not mechanistic about MIB1 specifically; EXCLUDE as they don't describe MIB1 mechanism\n- PMID:2012175, 8227122 — about Ki-67/MKI67, EXCLUDE\n- PMID:29322240, 27362226 — about Ki-67/MKI67, EXCLUDE\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2013,\n      \"finding\": \"MIB1 encodes an E3 ubiquitin ligase that promotes endocytosis of NOTCH ligands DELTA and JAGGED, and functions as a dimer; germline mutations in MIB1 that disrupt dimerization cause left ventricular noncompaction cardiomyopathy (LVNC). Targeted inactivation of Mib1 in mouse myocardium abolishes ventricular Notch1 activity, causing LVNC with expansion of compact myocardium into proliferative, immature trabeculae.\",\n      \"method\": \"Human genetics (autosomal-dominant pedigrees), mouse conditional knockout, zebrafish embryo functional assays, in silico modeling, reporter assays for NOTCH1 target gene expression\",\n      \"journal\": \"Nature medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal methods (human genetics + mouse KO + zebrafish + reporter assays), replicated across species, strong evidence for dimerization and Notch ligand endocytosis\",\n      \"pmids\": [\"23314057\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Zebrafish Mib and Mib2 are reciprocal E3 ubiquitin ligases and substrates of each other; they function redundantly in Notch signaling using DeltaC as a common substrate. The C-terminal RING finger domain is required for E3 ubiquitin ligase activity. Mib ubiquitinates and promotes endocytosis of Delta ligands to activate Notch signaling; loss-of-function (null) mib alleles abolish Notch signaling in zebrafish embryos. Antimorphic missense (M1013R) or truncation (C785stop) mutations in the RING finger act dominant-negatively on both Mib and Mib2.\",\n      \"method\": \"In vivo zebrafish genetics (null and antimorphic alleles), co-transfection ubiquitylation assays, Delta internalization assays, domain deletion analysis\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple alleles with in vivo epistasis, biochemical ubiquitination and internalization assays, strong evidence across two papers\",\n      \"pmids\": [\"17331493\", \"17196985\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Zebrafish Mib and Mib2 have C-terminal RING finger-dependent E3 ubiquitin ligase activity; they are mutual substrates of each other. While both ubiquitylate DeltaC as a common substrate, Mib2 differs from Mib in its ability to promote DeltaD internalization. Mib and Mib2 bind differently to extracellular and intracellular portions of DeltaA and DeltaC.\",\n      \"method\": \"In vitro and cell-based ubiquitination assays, endocytosis/internalization assays, co-immunoprecipitation, domain mapping\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — biochemical reconstitution of E3 activity with domain mutants, multiple substrates tested\",\n      \"pmids\": [\"17196985\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"MIB1 interacts with Polo-like kinase 4 (Plk4) and localizes to centriolar satellites; upon conditions inducing centriole amplification, MIB1 redistributes to centrioles. MIB1 E3 ligase activity triggers ubiquitylation of Plk4 on multiple sites, generating Lys11-, Lys29-, and Lys48-linked ubiquitin chains, which controls Plk4 abundance and its interaction with centrosomal proteins, thereby counteracting Plk4-induced centriole amplification.\",\n      \"method\": \"Co-immunoprecipitation, mass spectrometry, in vitro and cell-based ubiquitination assays with linkage-specific analysis, MIB1 E3 ligase mutants, live imaging of centriole amplification\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct biochemical identification of Plk4 ubiquitylation sites and linkage types, E3 ligase mutant validation, subcellular localization with functional consequence\",\n      \"pmids\": [\"25795303\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Mib1 is an E3 ubiquitin ligase that ubiquitinates and promotes endocytosis of Notch ligands in the developing spinal cord. Conditional knockout of Mib1 in mouse spinal cord causes depletion of progenitors, premature neuronal differentiation, and imbalanced V2 interneuron specification—phenotypes identical to Notch loss of function. Late removal of Mib1 specifically suppresses gliogenesis. The RING domain of Mib1 is required for V2 interneuron specification in chick neural tube.\",\n      \"method\": \"Conditional mouse knockout, drug-inducible deletion, chick in ovo electroporation with Mib1 deletion mutants, immunofluorescence for progenitor and neuronal markers\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with defined cellular phenotypes, domain mutagenesis in vivo, epistasis with Notch pathway\",\n      \"pmids\": [\"23223237\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"MicroRNA-10a/10b directly target the 3′-UTR of mib1 mRNA to suppress its expression. Loss of miR-10a/10b impairs blood vessel outgrowth (tip cell behavior) in zebrafish, and this phenotype is rescued by inhibition of mib1 or Notch signaling, placing Mib1 downstream of miR-10 in regulating angiogenesis in a Notch-dependent manner.\",\n      \"method\": \"In vitro luciferase reporter assay (miR-10 binding to mib1 3′-UTR), in vivo zebrafish reporter assay, morpholino knockdown of miR-10a/10b, mib1 inhibition rescue experiments\",\n      \"journal\": \"Cardiovascular research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct 3′-UTR luciferase validation and in vivo rescue, single lab\",\n      \"pmids\": [\"26825552\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"The tumor suppressor CYLD deubiquitinating enzyme directly deubiquitinates MIB1 to prevent MIB1 from ubiquitinating PCM1 (pericentriolar material protein 1) for proteasomal degradation. CYLD knockdown promotes PCM1 degradation, dismantles centriolar satellites, and impairs ciliogenesis; these effects are mediated through unchecked MIB1 E3 ligase activity.\",\n      \"method\": \"Proteomic screen (CYLD interactors), co-immunoprecipitation, ubiquitination assays, proteasome inhibitor rescue, siRNA knockdown, ciliogenesis assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — unbiased proteomic screen followed by mechanistic biochemical validation, multiple orthogonal methods, defined pathway placement\",\n      \"pmids\": [\"31067453\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"SNX17 recruits the deubiquitinase USP9X to antagonize MIB1-induced ubiquitination and proteasomal degradation of PCM1 specifically during serum-starvation-induced ciliogenesis. SNX17 deficiency leads to enhanced degradation of both USP9X and PCM1 and disrupts ciliogenesis. The SNX17/USP9X axis is dispensable for PCM1 homeostasis in serum-containing media, indicating context-specific regulation of MIB1 activity.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assays, siRNA knockdown, ciliogenesis assays, proteasome inhibitor treatment\",\n      \"journal\": \"Cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — mechanistic biochemical validation of the SNX17/USP9X/MIB1/PCM1 axis, single lab\",\n      \"pmids\": [\"31671755\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Mib1 ubiquitin ligase ubiquitinates Ctnnd1 (p120-catenin) at K547, which attenuates Rac1 activation in cultured cells. This Mib1-Ctnnd1-Rac1 pathway regulates persistent directional cell migration: MIB1 knockdown in HeLa cells increases random migration, and mib1 mutant zebrafish posterior lateral line primordium cells show increased random migration and loss of directional F-actin protrusions. Ctnnd1 knockdown partially rescues migration defects in mib1 mutant zebrafish.\",\n      \"method\": \"siRNA knockdown wound-closure assay, ubiquitination assays with site-specific mutagenesis (K547), Rac1 activity assay, zebrafish lateral line primordium live imaging, genetic rescue\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — site-specific ubiquitination mapping, Rac1 activity assay, in vivo zebrafish rescue, multiple orthogonal methods\",\n      \"pmids\": [\"29078376\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"MIB1 targets ST7 (suppressor of tumorigenicity 7) for ubiquitin-mediated proteasomal degradation in pancreatic cancer cells. ST7 normally suppresses tumor growth by downregulating IQGAP1; MIB1-mediated ST7 degradation relieves this suppression, thereby upregulating IQGAP1 and promoting proliferation and invasion.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assays, proteasome inhibitor treatment, siRNA knockdown and overexpression, in vitro and xenograft in vivo proliferation/invasion assays\",\n      \"journal\": \"Molecular oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct biochemical demonstration of MIB1-ST7 interaction and degradation, in vitro and in vivo phenotypes, single lab\",\n      \"pmids\": [\"33793053\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"MIB1 directly interacts with TOP3B (independently of TDRD3) and mediates its ubiquitylation and proteasomal degradation. The TDRD3-USP9X deubiquitinase complex acts downstream of MIB1 to stabilize TOP3B; depletion of TDRD3 increases TOP3B cleavage complexes (TOP3Bccs) in DNA and RNA, R-loops, γH2AX, and growth defects.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assays, siRNA knockdown (USP9X, TDRD3, MIB1), TOP3Bcc measurement in DNA and RNA, R-loop detection, γH2AX immunofluorescence\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct biochemical identification of MIB1-TOP3B interaction and ubiquitylation, multiple genetic perturbations, functional consequences measured, published in high-impact journal\",\n      \"pmids\": [\"37980342\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"MIB1 ubiquitinates DAPK1 (death-associated protein kinase 1) to promote its proteasomal degradation in glioblastoma cells. The natural compound sanggenon C suppresses MIB1 expression, leading to DAPK1 stabilization, reduced cell proliferation, and induced apoptosis in GBM cells; MIB1 overexpression reverses these effects.\",\n      \"method\": \"Quantitative proteomics, western blotting, siRNA/overexpression, ubiquitination assays, in vitro and in vivo GBM tumor models\",\n      \"journal\": \"MedComm\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — proteomic identification with biochemical validation of MIB1-DAPK1 ubiquitination axis, functional rescue experiments, single lab\",\n      \"pmids\": [\"37346933\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Human MIB1 pathological variants (p.T312Kfs*55 and p.W271G) identified in congenital heart disease patients significantly reduce MIB1 function, resulting in lower levels of JAGGED1 (JAG1) ubiquitination and reduced Notch signaling induction, demonstrating that MIB1-mediated ubiquitination of JAG1 is required for proper Notch pathway activation.\",\n      \"method\": \"Exome sequencing in CHD cohort, biochemical ubiquitination assays, Notch reporter assays, overexpression of mutant vs. wild-type MIB1\",\n      \"journal\": \"Clinical science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct biochemical demonstration that specific human mutations reduce JAG1 ubiquitination and Notch signaling, multiple mutations tested\",\n      \"pmids\": [\"30322850\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"MIB1 variants are associated with nonsyndromic bicuspid aortic valve (nsBAV). Two mouse models carrying Mib1 variants identified in human BAV patients develop bicuspid aortic valve on a NOTCH1-sensitized background, confirming that reduced MIB1 function impairs NOTCH pathway activity during aortic valve development.\",\n      \"method\": \"Familial exome sequencing and rare variant association, genetically modified mouse models on NOTCH1-sensitized background, cardiac phenotyping\",\n      \"journal\": \"JAMA cardiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic association with in vivo mouse model validation of functional consequence, NOTCH1 sensitization epistasis\",\n      \"pmids\": [\"37405741\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"miR-198 directly targets MIB1 mRNA, and knockdown of MIB1 recapitulates the effects of miR-198 overexpression: reduced proliferation, G0/G1 cell cycle arrest, impaired colony formation, and reduced in vivo tumor formation in LNCaP xenografts, establishing MIB1 as a pro-tumorigenic factor in prostate cancer.\",\n      \"method\": \"Luciferase reporter assay validating miR-198 binding to MIB1 3′-UTR, siRNA knockdown of MIB1, proliferation/cell cycle/colony formation assays, LNCaP xenograft model\",\n      \"journal\": \"Oncology reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — direct 3′-UTR validation and phenotypic rescue by MIB1 knockdown, in vivo tumor model, single lab\",\n      \"pmids\": [\"31322262\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"SNORA73B snoRNA modifies MIB1 mRNA by increasing its pseudouridine content, thereby stabilizing MIB1 mRNA and protein. Elevated MIB1 in turn increases ubiquitination of JAG1 and activates the Notch pathway to promote endometrial cancer progression. SNORA73B also regulates alternative splicing of RCC1 independent of MIB1.\",\n      \"method\": \"HPLC pseudouridine detection, actinomycin D mRNA stability assay, co-immunoprecipitation (JAG1 ubiquitination), RNA-seq, siRNA knockdown, xenograft model\",\n      \"journal\": \"Journal of cellular and molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple biochemical methods validating MIB1 mRNA stabilization and downstream JAG1 ubiquitination, functional in vivo experiments, single lab\",\n      \"pmids\": [\"37488742\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"MIB1 is a RING-domain E3 ubiquitin ligase that functions as a dimer and promotes the ubiquitination and endocytosis of NOTCH ligands (DELTA, JAGGED1) in signal-sending cells to activate NOTCH signaling in adjacent cells, with established roles in cardiac trabeculation, neurogenesis, gliogenesis, and angiogenesis; beyond Notch, MIB1 ubiquitinates additional substrates including Plk4 (controlling centriole homeostasis), PCM1 (regulating centriolar satellite proteostasis and ciliogenesis, counteracted by CYLD and the SNX17-USP9X complex), Ctnnd1/p120-catenin (suppressing Rac1 activity to direct persistent cell migration), ST7 (promoting pancreatic cancer progression via IQGAP1), TOP3B (preventing accumulation of deleterious topoisomerase cleavage complexes, counteracted by the TDRD3-USP9X complex), and DAPK1 (in glioblastoma).\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"MIB1 is a RING-domain E3 ubiquitin ligase that functions as a central regulator of Notch signaling and centrosomal/centriolar satellite homeostasis through ubiquitination of diverse substrates. MIB1 ubiquitinates Notch ligands Delta and Jagged/JAG1 to promote their endocytosis, a step required for Notch pathway activation in signal-sending cells during cardiac trabecular compaction, spinal cord neurogenesis, angiogenesis, and aortic valve morphogenesis [PMID:23314057, PMID:23223237, PMID:37405741]. Beyond Notch, MIB1 ubiquitinates PLK4 via Lys11/Lys29/Lys48-linked chains to limit centriole amplification, and ubiquitinates the centriolar satellite scaffold PCM1 for proteasomal degradation—an activity antagonized by the deubiquitinases CYLD and USP9X—thereby controlling ciliogenesis [PMID:25795303, PMID:31067453]. MIB1 also ubiquitinates Ctnnd1/p120-catenin at Lys547 to attenuate Rac1-dependent random migration and promote persistent directional cell movement, and targets TOP3B, DAPK1, and the tumor suppressor ST7 for proteasomal degradation [PMID:29078376, PMID:37980342, PMID:37346933, PMID:33793053].\",\n  \"teleology\": [\n    {\n      \"year\": 2007,\n      \"claim\": \"Establishing that Mib uses its C-terminal RING finger domain for E3 ligase activity toward Notch ligands and functions redundantly with Mib2 resolved the molecular basis of Mib-dependent Notch activation and revealed that antimorphic Mib alleles dominantly inhibit Mib2.\",\n      \"evidence\": \"In vitro ubiquitylation assays, Delta internalization assays, RING-finger mutagenesis, and allelic series analysis in zebrafish embryos\",\n      \"pmids\": [\"17196985\", \"17331493\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Structural basis for Mib/Mib2 interaction and dominant-negative mechanism not resolved\",\n        \"Relative contribution of individual RING fingers to activity in vivo unclear\"\n      ]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Conditional Mib1 knockout in mouse spinal cord demonstrated that MIB1-driven Notch ligand ubiquitination is essential for maintaining neural progenitor pools and specifying V2 interneurons, extending MIB1's in vivo role beyond early embryonic patterning.\",\n      \"evidence\": \"Conditional and drug-inducible Mib1 deletion in mice, chick neural tube misexpression of domain-deletion mutants, progenitor/interneuron marker analysis\",\n      \"pmids\": [\"23223237\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether MIB1 ubiquitinates additional non-Notch substrates in spinal cord progenitors unknown\",\n        \"Mechanism by which MIB1 RING domain specificity governs V2 versus other interneuron fates not defined\"\n      ]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Discovery that human MIB1 mutations disrupting dimerization cause left ventricular noncompaction cardiomyopathy via reduced NOTCH1 activation established the first Mendelian disease link and showed MIB1 dimerization is required for full ligase activity toward JAG1.\",\n      \"evidence\": \"Human germline mutation analysis, cell-based functional assays, zebrafish rescue, conditional mouse Mib1 cardiac knockout\",\n      \"pmids\": [\"23314057\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Structural details of the MIB1 dimer interface remain unresolved\",\n        \"Whether dimerization-deficient MIB1 retains activity toward non-Notch substrates untested\"\n      ]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Identification of PLK4 as a MIB1 substrate marked by Lys11/Lys29/Lys48-linked ubiquitin chains revealed MIB1's role in limiting centriole amplification, expanding its function beyond Notch signaling to centrosome biology.\",\n      \"evidence\": \"Co-immunoprecipitation, mass spectrometry, ubiquitylation assays, immunofluorescence, overexpression/knockdown with centriole number quantification\",\n      \"pmids\": [\"25795303\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether MIB1-dependent PLK4 regulation operates in vivo during tumorigenesis or development not shown\",\n        \"Mechanism triggering MIB1 redistribution from centriolar satellites to centrioles unclear\"\n      ]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Demonstrating that MIB1 ubiquitinates Ctnnd1 at Lys547 to attenuate Rac1 and direct persistent migration uncovered a Notch-independent role for MIB1 in cytoskeletal regulation and collective cell movement.\",\n      \"evidence\": \"shRNA knockdown wound-closure assay, Ctnnd1 K547 mutagenesis, Rac1 activity assays, zebrafish mib1 mutant live imaging with Ctnnd1 rescue\",\n      \"pmids\": [\"29078376\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Ubiquitin chain type on Ctnnd1 K547 not characterized\",\n        \"Whether this axis operates in mammalian morphogenesis or cancer metastasis in vivo not tested\"\n      ]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Discovery that CYLD and USP9X/SNX17 antagonize MIB1-mediated ubiquitination and degradation of PCM1 revealed a deubiquitinase-ligase balance governing centriolar satellite integrity and ciliogenesis.\",\n      \"evidence\": \"Proteomic screen for CYLD partners, Co-IP, CYLD/SNX17/USP9X knockdown with PCM1 degradation and ciliogenesis readouts, ubiquitination and rescue assays\",\n      \"pmids\": [\"31067453\", \"31671755\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether MIB1 ubiquitinates PCM1 via specific lysine residues or chain types undefined\",\n        \"Relative contribution of CYLD versus USP9X to PCM1 stabilization in different cell types unclear\"\n      ]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Identification of TOP3B as a MIB1 substrate whose stability is protected by the TDRD3-USP9X deubiquitinase complex extended MIB1's reach to DNA/RNA topoisomerase homeostasis and prevention of deleterious TOP3B cleavage complexes.\",\n      \"evidence\": \"Reciprocal Co-IP, ubiquitylation assays, triple knockdown epistasis, biochemical turnover experiments\",\n      \"pmids\": [\"37980342\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Physiological contexts in which MIB1-TOP3B regulation is rate-limiting not determined\",\n        \"Whether TOP3B ubiquitination involves specific chain types not resolved\"\n      ]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Showing that MIB1 promotes pancreatic cancer progression by degrading the tumor suppressor ST7 and consequently upregulating IQGAP1 revealed a Notch-independent oncogenic axis for MIB1.\",\n      \"evidence\": \"MIB1 overexpression/knockdown in pancreatic cancer cell lines, ubiquitylation/degradation assays, xenograft proliferation/invasion assays\",\n      \"pmids\": [\"33793053\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Direct ubiquitination sites on ST7 not mapped\",\n        \"Mechanism linking ST7 loss to IQGAP1 upregulation not biochemically defined\",\n        \"Not independently replicated\"\n      ]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Validation of MIB1 variants in NOTCH1-sensitized mouse models that develop bicuspid aortic valve confirmed MIB1 as a genetic modifier of congenital heart valve disease and reinforced its essential role in Notch-dependent valve morphogenesis.\",\n      \"evidence\": \"Familial exome sequencing, rare variant enrichment, two independent knock-in mouse models on NOTCH1+/− background\",\n      \"pmids\": [\"37405741\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether MIB1 variants alone (without NOTCH1 sensitization) are sufficient for BAV not tested\",\n        \"Cell-type-specific requirement (endocardial vs. mesenchymal) for MIB1 in valve development not resolved\"\n      ]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Demonstration that MIB1 ubiquitinates DAPK1 for proteasomal degradation and that pharmacological reduction of MIB1 stabilizes DAPK1 to suppress GBM growth identified another tumor-relevant substrate and a potential therapeutic angle.\",\n      \"evidence\": \"Quantitative proteomics, MIB1 overexpression/knockdown with DAPK1 stability readout, rescue experiments in GBM cells and xenografts\",\n      \"pmids\": [\"37346933\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Ubiquitination sites on DAPK1 not mapped\",\n        \"Whether MIB1-DAPK1 axis is specific to GBM or generalizes to other cancers unknown\",\n        \"Single-lab finding not independently validated\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The full substrate repertoire of MIB1 and how substrate selectivity is determined across different cellular contexts remain undefined; structural characterization of the MIB1 dimer and its RING-domain engagement with distinct substrates is lacking.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No high-resolution structure of full-length MIB1 or its dimer interface available\",\n        \"How MIB1 is recruited to specific substrates in different tissues is mechanistically unknown\",\n        \"Whether MIB1 auto-ubiquitination serves a regulatory function in mammalian cells not characterized\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 1, 2, 4, 5, 6, 7, 8, 11, 13, 14]},\n      {\"term_id\": \"GO:0016874\", \"supporting_discovery_ids\": [0, 1, 8]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [1, 2]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [1, 4]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 7, 8, 9, 10, 11, 12, 13]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [0, 1, 2, 4, 5, 6, 14]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [0, 7, 12]},\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [1, 2, 3]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [6, 14, 15]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"JAG1\",\n      \"PLK4\",\n      \"PCM1\",\n      \"CTNND1\",\n      \"TOP3B\",\n      \"DAPK1\",\n      \"ST7\",\n      \"MIB2\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"MIB1 is a RING-domain E3 ubiquitin-protein ligase that functions as a dimer and plays a central role in Notch pathway activation by ubiquitinating the Notch ligands Delta and Jagged in signal-sending cells, thereby promoting their endocytosis and enabling productive Notch receptor engagement in neighboring cells [PMID:23314057, PMID:17331493, PMID:30322850]. Beyond Notch, MIB1 ubiquitinates diverse substrates to control centriole homeostasis (Plk4), centriolar satellite integrity and ciliogenesis (PCM1, counteracted by CYLD and the SNX17–USP9X axis), directional cell migration (Ctnnd1/p120-catenin–Rac1 axis), and topoisomerase III beta proteostasis (TOP3B, counteracted by the TDRD3–USP9X complex) [PMID:25795303, PMID:31067453, PMID:29078376, PMID:37980342]. Germline loss-of-function or dimerization-disrupting mutations in MIB1 cause left ventricular noncompaction cardiomyopathy and contribute to congenital heart defects including bicuspid aortic valve through impaired Notch signaling during cardiac development [PMID:23314057, PMID:37405741]. In cancer contexts, MIB1-mediated degradation of ST7 and DAPK1 promotes pancreatic cancer and glioblastoma cell proliferation, respectively [PMID:33793053, PMID:37346933].\",\n  \"teleology\": [\n    {\n      \"year\": 2006,\n      \"claim\": \"Establishing MIB1 as a RING-finger-dependent E3 ubiquitin ligase that ubiquitinates Delta-family Notch ligands and promotes their endocytosis resolved how ligand-presenting cells generate the mechanical or endocytic force required for Notch activation.\",\n      \"evidence\": \"In vitro and cell-based ubiquitination assays with RING domain mutants, Delta internalization assays, and genetic analysis of zebrafish mib null and antimorphic alleles\",\n      \"pmids\": [\"17196985\", \"17331493\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Crystal structure of MIB1 RING–substrate complex not determined\", \"Precise mechanism by which ligand ubiquitination enables Notch activation (pulling force vs. recycling) unresolved\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Conditional knockout studies in mouse demonstrated that MIB1's E3 ligase activity is required in vivo for maintaining neural progenitor pools, specifying V2 interneurons, and promoting gliogenesis—all via Notch pathway activation—extending MIB1 function beyond early embryonic patterning to tissue-specific developmental roles.\",\n      \"evidence\": \"Conditional and inducible Mib1 knockout in mouse spinal cord, chick neural tube electroporation with RING deletion mutants\",\n      \"pmids\": [\"23223237\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether MIB1 substrates other than Delta/Jagged contribute to neural phenotypes is untested\", \"Relative contributions of MIB1 vs. MIB2 in mammalian neurogenesis not fully delineated\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"The discovery that MIB1 dimerization is essential for function and that dimerization-disrupting mutations cause left ventricular noncompaction cardiomyopathy established MIB1 as a Mendelian disease gene and linked its Notch ligand-ubiquitinating activity to human cardiac development.\",\n      \"evidence\": \"Human autosomal-dominant pedigrees, mouse cardiac-specific Mib1 knockout, zebrafish rescue, Notch1 reporter assays\",\n      \"pmids\": [\"23314057\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of dimerization not resolved at atomic level\", \"Whether dimerization-deficient MIB1 retains residual activity toward non-Notch substrates unknown\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Identification of Plk4 as a MIB1 substrate at centriolar satellites, with Lys11/29/48-linked ubiquitin chains controlling Plk4 abundance, revealed a Notch-independent role for MIB1 in centriole copy-number control.\",\n      \"evidence\": \"Mass spectrometry–based ubiquitin linkage analysis, co-immunoprecipitation, E3 ligase-dead mutants, live imaging of centriole amplification\",\n      \"pmids\": [\"25795303\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo physiological consequence of MIB1-Plk4 axis (e.g., in cycling tissues) not shown\", \"Whether MIB1 is the primary E3 for Plk4 or one of several is unclear\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Demonstration that MIB1 ubiquitinates p120-catenin (Ctnnd1) at K547 to suppress Rac1 and enforce directional migration uncovered a Notch-independent cytoskeletal function, validated by rescue of zebrafish lateral line primordium migration defects.\",\n      \"evidence\": \"Site-directed mutagenesis (K547), Rac1 activity pulldown, wound-healing and zebrafish primordium live imaging, genetic epistasis\",\n      \"pmids\": [\"29078376\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether Ctnnd1 ubiquitination is degradative or regulatory (signaling-type) not fully resolved\", \"Upstream signals directing MIB1 toward Ctnnd1 vs. Delta/Jagged unknown\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Two independent studies showed that MIB1 ubiquitinates PCM1 for proteasomal degradation at centriolar satellites, and that the deubiquitinases CYLD and USP9X (recruited by SNX17) counteract MIB1 to preserve PCM1 and enable ciliogenesis, establishing a ubiquitin-balance mechanism for centriolar satellite homeostasis.\",\n      \"evidence\": \"Proteomic screen for CYLD interactors, co-immunoprecipitation, ubiquitination assays, siRNA knockdown, proteasome inhibitor rescue, ciliogenesis quantification\",\n      \"pmids\": [\"31067453\", \"31671755\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether MIB1 targets other satellite proteins besides PCM1 untested\", \"How serum starvation specifically activates the SNX17-USP9X protective axis mechanistically unclear\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Clinical variants in MIB1 found in congenital heart disease patients were shown biochemically to reduce JAG1 ubiquitination and Notch signaling, and separately, Mib1 variants on a NOTCH1-sensitized mouse background produce bicuspid aortic valve, broadening the spectrum of MIB1-associated cardiac disease.\",\n      \"evidence\": \"Exome sequencing in CHD/BAV cohorts, ubiquitination assays with mutant MIB1, Notch reporter assays, genetically modified mice on Notch1+/− background\",\n      \"pmids\": [\"30322850\", \"37405741\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Penetrance and expressivity modifiers in human populations not identified\", \"Whether additional MIB1 substrates contribute to valve development is unknown\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"MIB1 was found to ubiquitinate TOP3B independently of TDRD3, targeting it for proteasomal degradation; the TDRD3–USP9X complex opposes this, and failure of this balance leads to accumulation of TOP3B cleavage complexes, R-loops, and DNA damage, extending MIB1 function to genome stability.\",\n      \"evidence\": \"Co-immunoprecipitation, ubiquitination assays, siRNA depletion of MIB1/TDRD3/USP9X, TOP3Bcc and R-loop quantification, γH2AX detection\",\n      \"pmids\": [\"37980342\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether MIB1-TOP3B axis operates in specific tissues or cell-cycle phases not determined\", \"Direct in vivo phenotypic consequences of deregulated TOP3B turnover via MIB1 not shown\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Identification of DAPK1 and ST7 as MIB1 degradation targets in glioblastoma and pancreatic cancer, respectively, implicated MIB1 E3 ligase activity in oncogenic signaling beyond Notch, though these substrates were each characterized in single-lab studies.\",\n      \"evidence\": \"Quantitative proteomics, ubiquitination assays, siRNA/overexpression rescue, xenograft tumor models\",\n      \"pmids\": [\"37346933\", \"33793053\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"DAPK1 and ST7 as MIB1 substrates each reported by single laboratories and await independent confirmation\", \"Whether MIB1 targeting of DAPK1/ST7 occurs in non-cancer contexts is unknown\", \"Substrate selectivity determinants for MIB1 among its growing list of targets remain uncharacterized\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the structural basis of MIB1 dimerization and substrate selectivity, how MIB1 is directed toward its diverse substrates in different cellular contexts, and whether additional disease-associated substrates exist beyond Notch ligands.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No high-resolution structure of full-length MIB1 or its dimer interface\", \"Regulatory inputs that switch MIB1 substrate preference (Notch ligands vs. PCM1 vs. Plk4 vs. Ctnnd1 vs. TOP3B) are undefined\", \"Systematic substrate profiling has not been performed\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 1, 2, 3, 4, 6, 7, 8, 9, 10, 11, 12]},\n      {\"term_id\": \"GO:0016874\", \"supporting_discovery_ids\": [0, 1, 2, 3, 6, 8, 10]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [3, 6, 7]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [1, 2, 8]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 1, 2, 4, 5, 12, 13, 15]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [0, 1, 3, 6, 8, 10, 11]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [0, 4, 13]},\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [3, 6, 7]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [9, 11, 14]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"DLL1\",\n      \"JAG1\",\n      \"PLK4\",\n      \"PCM1\",\n      \"CTNND1\",\n      \"TOP3B\",\n      \"CYLD\",\n      \"USP9X\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}