{"gene":"ADAMTS9","run_date":"2026-06-09T22:02:41","timeline":{"discoveries":[{"year":2003,"finding":"ADAMTS9 is activated by selective proprotein convertase (furin) cleavage at the Arg287-Phe288 bond, as demonstrated by pulse-chase analysis, site-directed mutagenesis, and amino acid sequencing. The ancillary domains (including TSRs) are required for cell-surface localization and for versicanase/aggrecanase activity; the catalytic domain alone is insufficient.","method":"Pulse-chase analysis, site-directed mutagenesis, amino acid sequencing, cell transfection with proteolytic activity assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — multiple orthogonal methods (mutagenesis, pulse-chase, sequencing) in a single rigorous study establishing both processing mechanism and domain requirements","pmids":["12514189"],"is_preprint":false},{"year":2006,"finding":"Pro-ADAMTS9 zymogen is not processed intracellularly but is secreted intact to the cell surface, where furin cleaves the propeptide extracellularly. This cell-surface furin-dependent processing was demonstrated by PC inhibitors, furin-deficient cells, furin rescue, and furin siRNA knockdown. PC5A can also process pro-ADAMTS9 but likewise only extracellularly.","method":"Pulse-chase analysis, PC inhibitors, furin-deficient cell lines, furin rescue, furin siRNA","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — multiple orthogonal genetic and pharmacological approaches in a single mechanistic study","pmids":["16537537"],"is_preprint":false},{"year":2007,"finding":"The ADAMTS9 propeptide functions as an intramolecular chaperone required for secretion: N-linked glycosylation at three consensus sites in the propeptide is essential for secretion. Furin processing at three sites (Arg74, Arg209, Arg287) paradoxically reduces rather than activates catalytic activity, with propeptide fragments retaining non-covalent association with the catalytic domain after processing.","method":"Site-directed mutagenesis of N-glycosylation and furin cleavage sites, pulse-chase, versican cleavage assays, proprotein convertase inhibitor treatment","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — mutagenesis of multiple sites combined with functional versican cleavage assays, single rigorous study with multiple orthogonal approaches","pmids":["17403680"],"is_preprint":false},{"year":2009,"finding":"Cell-surface processing of pro-ADAMTS9 is regulated by the ER chaperone GRP94/gp96, which forms an immunoprecipitable complex with pro-ADAMTS9 and furin at the cell surface. Geldanamycin (gp96/HSP90 inhibitor) decreases furin processing of pro-ADAMTS9; gp96 siRNA reduces cell-surface pro-ADAMTS9 and furin; BiP siRNA reduces cell-surface pro-ADAMTS9 but not furin.","method":"Cross-linking/mass spectrometry, co-immunoprecipitation, geldanamycin treatment, gp96 and BiP siRNA knockdown","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP, mass spectrometry identification, and siRNA knockdown with functional readout in a single study","pmids":["19875450"],"is_preprint":false},{"year":2010,"finding":"ADAMTS9 haploinsufficiency in mice leads to reduced versican cleavage and accumulation of versican in the aortic wall and cardiac valves, demonstrating that ADAMTS9-mediated versican proteolysis is required for normal cardiovascular development and homeostasis.","method":"Adamts9+/LacZ mouse model, immunostaining for versican and cleaved versican, beta-galactosidase staining, histological analysis","journal":"Matrix biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — in vivo genetic model with direct substrate accumulation readout, single lab with multiple anatomical analyses","pmids":["20096780"],"is_preprint":false},{"year":2010,"finding":"ADAMTS9 is expressed cell-autonomously in microvascular endothelial cells and acts as an angiogenesis inhibitor through its proteolytic activity: ADAMTS9 siRNA in human microvascular ECs increases filopodia, migration, and tube formation; catalytically active (but not inactive) ADAMTS9 overexpression reduces tube formation. Unlike ADAMTS1, ADAMTS9 neither cleaves thrombospondins 1/2 nor binds VEGF165.","method":"siRNA knockdown, overexpression of active vs. catalytically inactive ADAMTS9, tube formation/Matrigel assay, cell migration assay, heterotopic tumor model in ADAMTS9+/- mice","journal":"The American journal of pathology","confidence":"High","confidence_rationale":"Tier 2 / Strong — catalytic mutant comparison, in vitro functional assays, and in vivo mouse tumor model with multiple orthogonal approaches","pmids":["20093484"],"is_preprint":false},{"year":2010,"finding":"ADAMTS9 suppresses tumor formation and angiogenesis in esophageal squamous cell carcinoma and nasopharyngeal carcinoma; ADAMTS9 re-expression reduces microvessel numbers in Matrigel plugs and reduces tube formation by HUVECs, associated with reduced MMP9 and VEGFA expression.","method":"Tumorigenicity assays in nude mice, in vivo Matrigel plug angiogenesis assay, conditioned medium HUVEC tube formation assay, VEGFA/MMP9 expression analysis","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo angiogenesis and tumorigenicity assays with downstream marker measurements, single lab","pmids":["20551050"],"is_preprint":false},{"year":2005,"finding":"IL-1β and TNFα synergistically induce ADAMTS9 mRNA and protein expression in OUMS-27 chondrosarcoma cells and human chondrocytes, and this induction is mediated through the MAPK signaling pathway (p38 and MEK1/2 inhibitors SB203580 and PD98059 decrease upregulation).","method":"qRT-PCR, Northern blotting, Western blotting, pharmacological MAPK inhibitors in cytokine-stimulated cells","journal":"Arthritis and rheumatism","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological pathway dissection with protein-level confirmation, single lab","pmids":["15880812"],"is_preprint":false},{"year":2008,"finding":"IL-1β-induced ADAMTS9 expression in chondrocytes is transcriptionally regulated by NFATc1, which binds directly to distal and proximal promoter elements of ADAMTS9, as shown by chromatin immunoprecipitation, promoter-reporter assays, and inhibition by FK506 and 11R-VIVIT.","method":"Promoter cloning, chromatin immunoprecipitation (ChIP), luciferase reporter assays, NFAT inhibitors (FK506, 11R-VIVIT), qRT-PCR","journal":"Molecular and cellular biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP demonstrating direct promoter binding plus functional reporter assays, single lab","pmids":["19052845"],"is_preprint":false},{"year":2015,"finding":"ADAMTS9 produced by mesenchymal cells is required for umbilical vascular smooth muscle cell proliferation, differentiation, and orthogonal rotation by mediating versican proteolysis and ECM dynamics. Loss of ADAMTS9 impairs PDGFRβ/MAPK-ERK signaling and disrupts Shh signaling and primary cilium orientation in mesenchymal cells.","method":"Adamts9 gene trap (Gt) allele mice, conditional Adamts9 deletion, immunostaining for versican cleavage products, PDGFRβ/ERK pathway analysis, Shh signaling analysis, primary cilium imaging","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple genetic models (gene trap + conditional deletion), multiple mechanistic pathway readouts, in vivo validation","pmids":["26027930"],"is_preprint":false},{"year":2018,"finding":"ADAMTS9 proteolytic cleavage of pericellular versican is required to maintain focal adhesions in uterine smooth muscle cells. Versican knockdown or exogenous versican proteolysis rescues focal adhesion phenotype caused by ADAMTS9 depletion; pericellular versican accumulation acts upstream of cytoskeletal assembly and SMC differentiation. ADAMTS9 is required for myometrial activation and parturition in mice.","method":"Conditional Adamts9 deletion in uterine SMC, ADAMTS9 siRNA knockdown, versican siRNA, exogenous versican proteolysis, focal adhesion immunostaining, parturition phenotype analysis","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO in vivo plus epistasis experiments (versican KD rescues phenotype), multiple orthogonal methods in single study","pmids":["29642006"],"is_preprint":false},{"year":2016,"finding":"POFUT2-mediated O-fucosylation of ADAMTS9 thrombospondin type 1 repeats is required for ADAMTS9 secretion. CRISPR/Cas9 knockout of POFUT2 in HEK293T cells blocks ADAMTS9 secretion. Conditional deletion evidence shows that loss of ADAMTS9 in extra-embryonic tissues (not epiblast) is responsible for gastrulation defects in Pofut2 mutants.","method":"CRISPR/Cas9 knockout of POFUT2 in HEK293T cells, Cre-mediated conditional deletion of Pofut2 and Adamts9, comparison of knockout phenotypes, ADAMTS9 secretion assay","journal":"Developmental biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — biochemical secretion assay combined with multiple conditional genetic models demonstrating tissue-specific epistasis","pmids":["27297885"],"is_preprint":false},{"year":2019,"finding":"ADAMTS9 binds fibronectin through multiple sites identified by yeast two-hybrid and confirmed by solid-phase binding assays and surface plasmon resonance. Catalytically active ADAMTS9 disrupts fibronectin fibril networks formed by fibroblasts; ADAMTS9-deficient RPE1 cells assemble a more robust fibronectin network. LC-MS identified a cleavage site at Gly2196-Leu2197 in the linker between fibronectin modules III17 and I10.","method":"Yeast two-hybrid screen, solid-phase binding assay, surface plasmon resonance, fibronectin fibril disruption assay, ADAMTS9-deficient cell lines, targeted LC-MS of fibronectin cleavage products","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro binding reconstitution with SPR, catalytic mutant comparison, mass spectrometry identification of cleavage site, loss-of-function cell model","pmids":["31085586"],"is_preprint":false},{"year":2012,"finding":"ADAMTS9 (and its C. elegans ortholog GON-1) has a novel intracellular function in promoting ER-to-Golgi protein transport, mediated by its C-terminal GON domain and independent of its protease activity. Knockdown of ADAMTS9 in human cells inhibits this transport, and the GON domain expressed in the ER rescues the phenotype.","method":"siRNA knockdown of ADAMTS9 in human cells, expression of GON domain constructs, ER-to-Golgi transport assays, C. elegans GON-1 loss-of-function genetics","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional rescue with domain construct plus parallel C. elegans validation, single lab","pmids":["22419820"],"is_preprint":false},{"year":2019,"finding":"ADAMTS9 overexpression in skeletal muscle impairs insulin signaling through alterations in the integrin β1 signaling pathway and cytoskeletal organization, and leads to mitochondrial dysfunction. Mice lacking Adamts9 selectively in skeletal muscle have improved insulin sensitivity. The ADAMTS9 rs4607103 C risk allele is associated with increased ADAMTS9 expression and decreased insulin sensitivity in human skeletal muscle.","method":"Muscle-specific Adamts9 knockout mice (insulin clamp studies), ADAMTS9 overexpression in skeletal muscle, integrin β1 and cytoskeletal marker analysis, mitochondrial function assays, human genetic association with expression data","journal":"Diabetes","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo KO and overexpression models with mechanistic pathway analysis, single lab, human data supporting translational relevance","pmids":["30626608"],"is_preprint":false},{"year":2015,"finding":"In C. elegans, loss of GON-1 (ADAMTS9 ortholog) impairs secretion of insulin orthologs and TGF-β, alters insulin/IGF-1 signaling in peripheral tissues, and affects lifespan and dauer formation. These functions require the GON domain but not the protease domain.","method":"C. elegans GON-1 loss-of-function genetics, protein secretion assays, dauer/lifespan phenotype analysis, domain rescue experiments","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic model with domain rescue and secretion assays, single lab, C. elegans ortholog","pmids":["26218657"],"is_preprint":false},{"year":2019,"finding":"In mouse cartilage lacking ADAMTS-4 and ADAMTS-5 catalytic activity, ADAMTS-9 is upregulated by retinoic acid and cleaves aggrecan at E↓G bonds (rather than the E↓A bonds cleaved by ADAMTS-4/5), demonstrating a distinct aggrecanase specificity for ADAMTS-9 that may support normal skeletal development.","method":"Microarray of TS-4/5Δcat mouse cartilage explants, immunohistochemistry for ADAMTS-9 in growth plate, aggrecan cleavage site analysis","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic double-null model combined with cleavage site characterization, single lab","pmids":["30699963"],"is_preprint":false},{"year":2023,"finding":"ADAMTS9 (and ADAMTS20) cleaves membrane type 1-matrix metalloproteinase (MT1-MMP) at Tyr314-Gly315 in the hinge region (between catalytic and hemopexin domains) and at a second site in the hemopexin domain, dependent on hinge O-glycosylation. Loss of ADAMTS9/20 increases MT1-MMP retention on the cell surface and increases pro-MMP2 activation. MT1-MMP knockdown in ADAMTS9/20-deficient cells restores focal adhesions but not ciliogenesis.","method":"Quantitative terminomics (TAILS), gene-edited RPE-1 cells lacking ADAMTS9, re-expression of ADAMTS9/ADAMTS20, MT1-MMP ectodomain shedding assay, pro-MMP2 activation assay, MT1-MMP siRNA epistasis","journal":"Molecular & cellular proteomics","confidence":"High","confidence_rationale":"Tier 1 / Strong — unbiased quantitative degradomics with orthogonal validation by re-expression and epistasis experiments identifying a novel substrate and cleavage sites","pmids":["37169079"],"is_preprint":false},{"year":2021,"finding":"ADAMTS9 expression is silenced in gastric cancer by DNMT3A-mediated promoter hypermethylation; RNF180 ubiquitinates DNMT3A leading to its proteasomal degradation, thereby restoring ADAMTS9 expression. Restored ADAMTS9 expression suppresses GC cell viability and motility. ADAMTS9 is enriched in the nuclei of gastric mucosal cells and significantly alters gene expression profiles.","method":"ADAMTS9 re-expression in gastric cancer cells, RNA-sequencing, DNMT3A and RNF180 manipulation, ubiquitination assay, methylation analysis","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional re-expression plus epigenetic regulatory pathway characterization, single lab","pmids":["33931579"],"is_preprint":false},{"year":2022,"finding":"METTL3-mediated m6A RNA modification leads to YTHDF2-dependent degradation of ADAMTS9 mRNA in gastric cancer, suppressing ADAMTS9 protein levels and facilitating angiogenesis and carcinogenesis via the ADAMTS9-mediated PI3K/AKT pathway.","method":"METTL3 overexpression/knockdown, phenotypic assays, YTHDF2-dependent mRNA stability assays, ADAMTS9 rescue experiments, PI3K/AKT pathway analysis","journal":"Frontiers in oncology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — epistasis rescue experiment linking METTL3-m6A-YTHDF2 axis to ADAMTS9 mRNA stability, single lab","pmids":["35574388"],"is_preprint":false},{"year":2019,"finding":"In zebrafish, gonadotropin (hCG/LH analog) induces adamts9 expression in preovulatory follicles via Lhcgr and its associated cAMP and PKC signaling pathways, as shown by dose-response, lhcgr-/- and pgr-/- zebrafish follicle experiments.","method":"hCG dose-response in zebrafish follicles in vitro, lhcgr-/- and pgr-/- zebrafish genetic models, cAMP and PKC pathway inhibitors","journal":"Molecular and cellular endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic receptor knockout models with pharmacological pathway dissection, single lab","pmids":["31586455"],"is_preprint":false},{"year":2019,"finding":"Adamts9 is required for ovarian development and ovulation in zebrafish; adamts9-/- female fish have small ovaries with few mature oocytes, and no ovulated oocytes were observed, establishing ADAMTS9 as necessary for oocyte maturation/ovulation.","method":"CRISPR/Cas9 adamts9 knockout zebrafish, histological examination of gonads","journal":"General and comparative endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo genetic knockout with defined gonadal phenotype, single lab","pmids":["30951722"],"is_preprint":false},{"year":2018,"finding":"ENU-induced dominant Adamts9 mutations (Und3 and Und4) cause loss of melanocytes in the mouse tail epidermis at ~E18.5, with evidence for a cell-autonomous requirement in melanocytes. TAILS N-terminomics proteomics identified new candidate ADAMTS9 substrates in skin ECM.","method":"ENU mutagenesis, conditional Adamts9 allele, TAILS N-terminomics proteomics of skin ECM","journal":"Pigment cell & melanoma research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional allele establishing cell-autonomy plus unbiased substrate discovery proteomics, single lab","pmids":["29781574"],"is_preprint":false},{"year":2019,"finding":"Mechanical strain attenuates cytokine-induced ADAMTS9 expression in chondrocytes via the mechanosensitive TRPV1 channel, which inhibits NF-κB translocation to the nucleus; TRPV1 pharmacological inhibitors and siRNA abolish this effect.","method":"Cyclic tensile strain on chondrocytes, TRPV1 pharmacological inhibitors (gadolinium, ruthenium red), TRPV1 siRNA, NF-κB nuclear translocation assay, qRT-PCR","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological and siRNA mechanistic dissection of mechanosensing pathway, single lab","pmids":["31415758"],"is_preprint":false},{"year":2023,"finding":"ADAMTS9 knockout in kidney organoids derived from human iPSCs reduces the number of primary cilia, recapitulating renal ciliopathy. Single-cell transcriptomics show highest ADAMTS9 expression in podocytes and proximal tubules; loss increases Wnt/PCP signaling activity in podocyte clusters.","method":"ADAMTS9 knockout hiPSC-derived kidney organoids, single-cell RNA sequencing, primary cilia quantification","journal":"Frontiers in medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — human organoid KO model with single-cell transcriptomics and direct cilia phenotype readout, single lab","pmids":["37035301"],"is_preprint":false},{"year":2019,"finding":"ADAMTS9 conditional deletion in mouse uterine smooth muscle cells demonstrates a requirement for myometrial activation and parturition, acting through pericellular versican proteolysis to maintain focal adhesions upstream of cytoskeletal assembly and SMC differentiation.","method":"Conditional Adamts9 deletion in uterine SMC (Cre-lox), versican immunostaining, focal adhesion marker analysis, parturition phenotype","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional genetic model with substrate-level and signaling pathway validation, in vivo phenotype","pmids":["29642006"],"is_preprint":false},{"year":2019,"finding":"B3GLCT (β3-glucosyltransferase) inactivation differentially affects ADAMTS9 and ADAMTS20 function; ADAMTS9 is partially reduced (not abolished) by B3GLCT loss, causing eye abnormalities and contributing to cleft palate in mice, whereas white spotting and hydrocephalus arise from ADAMTS20 loss.","method":"B3glct knockout mouse alleles, genetic rescue experiments, biochemical secretion assays for ADAMTS9 and ADAMTS20","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic and biochemical epistasis dissecting two ADAMTS targets of B3GLCT, single lab","pmids":["31600785"],"is_preprint":false}],"current_model":"ADAMTS9 is a secreted zinc metalloprotease that undergoes cell-surface (not intracellular) furin-mediated propeptide cleavage—facilitated by the chaperones GRP94/gp96 and BiP—whose propeptide glycosylation is required for secretion and whose processing paradoxically reduces rather than activates catalytic activity; once active, it cleaves extracellular matrix proteoglycans (versican at Glu441-Ala442, aggrecan at Glu1771-Ala1772 and at E↓G bonds), fibronectin at Gly2196-Leu2197, and the transmembrane metalloprotease MT1-MMP in its hinge and hemopexin domains; its C-terminal GON domain independently promotes ER-to-Golgi protein transport; through ECM remodeling it regulates focal adhesion maintenance, smooth muscle cell differentiation, primary cilium biogenesis, angiogenesis, cardiovascular development, ovarian/gonadal development, melanocyte maintenance, and skeletal muscle insulin sensitivity via integrin β1 signaling, while its expression is induced by IL-1β/TNFα through NFATc1 and MAPK pathways and suppressed by mechanical strain via TRPV1/NF-κB, with the gene frequently silenced by promoter hypermethylation (partly via DNMT3A) or by METTL3/YTHDF2-dependent mRNA degradation in multiple cancers."},"narrative":{"mechanistic_narrative":"ADAMTS9 is a secreted zinc metalloprotease that remodels the pericellular and extracellular matrix to control cardiovascular, gonadal, skeletal, and vascular development [PMID:20096780, PMID:26027930, PMID:30951722]. It is synthesized as a zymogen that is secreted intact and processed at the cell surface by furin (and PC5A) at the Arg287-Phe288 bond rather than intracellularly [PMID:12514189, PMID:16537537]; its propeptide acts as an intramolecular chaperone requiring N-linked glycosylation for secretion, and—paradoxically—furin processing reduces rather than activates catalytic activity, with cleaved propeptide fragments remaining non-covalently associated with the catalytic domain [PMID:17403680]. Cell-surface processing is organized by the chaperones GRP94/gp96 and BiP, which form a complex with pro-ADAMTS9 and furin [PMID:19875450], while secretion additionally requires POFUT2-mediated O-fucosylation and B3GLCT-mediated glucosylation of its thrombospondin type 1 repeats [PMID:27297885, PMID:31600785]. The ancillary (TSR-containing) domains, not the catalytic domain alone, are required for cell-surface localization and substrate cleavage [PMID:12514189]. Active ADAMTS9 cleaves matrix proteoglycans—versican and aggrecan (the latter at E↓G bonds distinct from ADAMTS-4/5) [PMID:17403680, PMID:20096780, PMID:30699963]—as well as fibronectin at Gly2196-Leu2197 [PMID:31085586] and the transmembrane metalloprotease MT1-MMP in its hinge and hemopexin domains, limiting MT1-MMP surface retention and pro-MMP2 activation [PMID:37169079]. Through pericellular versican proteolysis ADAMTS9 maintains focal adhesions upstream of cytoskeletal assembly and smooth muscle cell differentiation, drives PDGFRβ/ERK and Hedgehog signaling, supports primary cilium biogenesis, and is required for myometrial activation and parturition [PMID:26027930, PMID:29642006, PMID:37035301, PMID:37169079]; it also acts cell-autonomously as an angiogenesis inhibitor through its catalytic activity [PMID:20093484]. Independent of protease function, its C-terminal GON domain promotes ER-to-Golgi protein transport [PMID:22419820]. Expression is induced by IL-1β/TNFα via MAPK signaling and NFATc1-mediated transcription [PMID:15880812, PMID:19052845], attenuated by mechanical strain through TRPV1-dependent suppression of NF-κB [PMID:31415758], and silenced in cancers by DNMT3A-driven promoter hypermethylation or METTL3/YTHDF2-dependent mRNA degradation [PMID:33931579, PMID:35574388].","teleology":[{"year":2003,"claim":"Established how the latent zymogen becomes active and which regions are needed, answering whether the catalytic domain alone suffices for proteoglycan cleavage.","evidence":"Pulse-chase, site-directed mutagenesis, and amino acid sequencing in transfected cells with proteolytic assays","pmids":["12514189"],"confidence":"High","gaps":["Did not resolve where processing occurs (intra- vs. extracellular)","Mechanism by which TSR-containing ancillary domains direct localization not defined"]},{"year":2006,"claim":"Resolved the cellular location of activation, showing the zymogen is secreted intact and processed at the cell surface rather than within the secretory pathway.","evidence":"Pulse-chase with PC inhibitors, furin-deficient cells, furin rescue, and furin siRNA","pmids":["16537537"],"confidence":"High","gaps":["Functional consequence of surface processing not yet linked to activity change","Chaperones organizing surface processing unknown"]},{"year":2007,"claim":"Reframed propeptide processing as a secretion/chaperone requirement rather than an activation step, since furin cleavage reduced catalytic activity.","evidence":"Mutagenesis of N-glycosylation and furin sites with versican cleavage assays","pmids":["17403680"],"confidence":"High","gaps":["Structural basis of propeptide retention on catalytic domain unresolved","Physiological trigger that fully activates the enzyme not identified"]},{"year":2009,"claim":"Identified the chaperone machinery coordinating surface processing, explaining how an ER chaperone influences extracellular furin cleavage.","evidence":"Cross-linking/MS, reciprocal co-IP, geldanamycin, and gp96/BiP siRNA with functional readout","pmids":["19875450"],"confidence":"High","gaps":["How an ER chaperone reaches the cell surface not mechanistically defined","Stoichiometry of the pro-ADAMTS9/furin/gp96 complex unknown"]},{"year":2016,"claim":"Demonstrated that TSR glycosylation is a gatekeeper for secretion, linking a glycosyltransferase to ADAMTS9 trafficking and developmental requirement.","evidence":"CRISPR POFUT2 knockout secretion assay plus conditional Pofut2/Adamts9 deletion epistasis","pmids":["27297885"],"confidence":"High","gaps":["Whether other TSR modifications act redundantly not fully resolved","Substrate repertoire affected by secretion failure not mapped"]},{"year":2010,"claim":"Provided the first in vivo evidence that versican proteolysis by ADAMTS9 is required for normal cardiovascular structure.","evidence":"Adamts9+/LacZ haploinsufficient mice with versican and cleaved-versican immunostaining","pmids":["20096780"],"confidence":"High","gaps":["Cell types responsible for cardiovascular phenotype not delineated here","Downstream signaling consequences of versican accumulation not addressed"]},{"year":2010,"claim":"Defined ADAMTS9 as a catalytically dependent endothelial angiogenesis inhibitor distinct in mechanism from ADAMTS1.","evidence":"siRNA, active vs. inactive overexpression, tube formation/migration assays, and ADAMTS9+/- tumor model","pmids":["20093484","20551050"],"confidence":"High","gaps":["Endothelial substrate driving anti-angiogenic effect not identified","Relationship between ECM cleavage and VEGFA/MMP9 changes correlative"]},{"year":2015,"claim":"Connected versican proteolysis to vascular smooth muscle morphogenesis and primary cilium-linked signaling, moving from substrate accumulation to downstream pathways.","evidence":"Adamts9 gene trap and conditional deletion mice with PDGFRβ/ERK, Shh, and cilium readouts","pmids":["26027930"],"confidence":"High","gaps":["Direct molecular link between versican turnover and ciliary signaling unclear","Whether ECM cleavage products signal directly not established"]},{"year":2018,"claim":"Placed pericellular versican proteolysis upstream of focal adhesion maintenance and SMC differentiation, providing an epistatic mechanism for the tissue phenotype.","evidence":"Conditional uterine SMC Adamts9 deletion with versican knockdown rescue and parturition analysis","pmids":["29642006"],"confidence":"High","gaps":["Receptor reading versican accumulation to focal adhesions not identified here","Generalizability beyond uterine SMC untested"]},{"year":2019,"claim":"Expanded the substrate repertoire beyond proteoglycans by identifying fibronectin as a direct binding partner and cleavage target affecting matrix fibril assembly.","evidence":"Yeast two-hybrid, SPR/solid-phase binding, fibril disruption, ADAMTS9-deficient cells, and LC-MS cleavage-site mapping","pmids":["31085586"],"confidence":"High","gaps":["In vivo relevance of fibronectin cleavage not yet demonstrated","Which phenotypes depend on fibronectin vs. proteoglycan substrates unresolved"]},{"year":2012,"claim":"Revealed a protease-independent intracellular role in ER-to-Golgi transport mediated by the GON domain, broadening ADAMTS9 function beyond ECM proteolysis.","evidence":"ADAMTS9 siRNA, GON-domain rescue constructs, transport assays, and C. elegans GON-1 genetics","pmids":["22419820","26218657"],"confidence":"Medium","gaps":["Molecular partners of the GON domain in transport unknown","Relationship between secretory function and extracellular protease role unclear"]},{"year":2023,"claim":"Identified MT1-MMP as a transmembrane substrate, linking ADAMTS9 to control of cell-surface metalloprotease activity and ciliogenesis versus focal adhesions.","evidence":"TAILS degradomics, gene-edited RPE-1 cells, re-expression, shedding/pro-MMP2 assays, and MT1-MMP siRNA epistasis","pmids":["37169079"],"confidence":"High","gaps":["Why MT1-MMP knockdown rescues focal adhesions but not ciliogenesis unexplained","In vivo significance of MT1-MMP cleavage not established"]},{"year":2019,"claim":"Linked ADAMTS9 to metabolic regulation, showing muscle-specific gain and loss of function alter integrin β1 signaling and insulin sensitivity in line with a human risk allele.","evidence":"Muscle-specific knockout/overexpression mice with clamp studies and human eQTL association","pmids":["30626608"],"confidence":"Medium","gaps":["Direct substrate mediating integrin β1 signaling changes unidentified","Causality of human risk-allele association limited to correlation"]},{"year":2021,"claim":"Characterized epigenetic and post-transcriptional silencing of ADAMTS9 in cancer, defining how its tumor-suppressive expression is lost.","evidence":"Re-expression with RNA-seq, DNMT3A/RNF180 manipulation and methylation analysis; METTL3/YTHDF2 mRNA-stability and PI3K/AKT rescue assays","pmids":["33931579","35574388"],"confidence":"Medium","gaps":["Whether nuclear ADAMTS9 enrichment reflects a direct function unresolved","Substrate basis of tumor suppression in these cancers not defined"]},{"year":2023,"claim":"Modeled the ciliary requirement in a human system, tying ADAMTS9 loss to reduced primary cilia and altered Wnt/PCP signaling in kidney cell types.","evidence":"ADAMTS9-knockout hiPSC kidney organoids with single-cell RNA-seq and cilia quantification","pmids":["37035301"],"confidence":"Medium","gaps":["Substrate driving ciliary defect in organoids not identified","Direct vs. indirect effect on Wnt/PCP signaling unresolved"]},{"year":null,"claim":"How ADAMTS9's distinct activities—ECM proteolysis, MT1-MMP regulation, and GON-domain-mediated secretion—are integrated to produce specific developmental and disease phenotypes remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unifying structural model connecting domains to substrate selection","The receptor/effector that translates ECM cleavage into focal adhesion and ciliary signaling is unidentified","In vivo relevance of fibronectin and MT1-MMP cleavage not tested in mammals"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,2,4,12,17]},{"term_id":"GO:0016787","term_label":"hydrolase activity","supporting_discovery_ids":[0,12,17]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,1,3]},{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[4,5,12]},{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[13]},{"term_id":"GO:0031012","term_label":"extracellular matrix","supporting_discovery_ids":[4,9,12]}],"pathway":[{"term_id":"R-HSA-1474244","term_label":"Extracellular matrix organization","supporting_discovery_ids":[4,9,10,12]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[9,11,21,26]},{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[13]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[0,1,17]}],"complexes":[],"partners":["FURIN","PCSK5","HSP90B1","HSPA5","POFUT2","B3GLCT","FN1","MMP14"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9P2N4","full_name":"A disintegrin and metalloproteinase with thrombospondin motifs 9","aliases":[],"length_aa":1935,"mass_kda":216.5,"function":"Cleaves the large aggregating proteoglycans, aggrecan (at the '1838-Glu-|-Ala-1839' site) and versican (at the '1428-Glu-|-Ala-1429' site). 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therapy","url":"https://pubmed.ncbi.nlm.nih.gov/32801743","citation_count":12,"is_preprint":false},{"pmid":"37169079","id":"PMC_37169079","title":"Degradomic Identification of Membrane Type 1-Matrix Metalloproteinase as an ADAMTS9 and ADAMTS20 Substrate.","date":"2023","source":"Molecular & cellular proteomics : MCP","url":"https://pubmed.ncbi.nlm.nih.gov/37169079","citation_count":11,"is_preprint":false},{"pmid":"29137610","id":"PMC_29137610","title":"Hemoglobin stimulates the expression of ADAMTS-5 and ADAMTS-9 by synovial cells: a possible cause of articular cartilage damage after intra-articular hemorrhage.","date":"2017","source":"BMC musculoskeletal disorders","url":"https://pubmed.ncbi.nlm.nih.gov/29137610","citation_count":11,"is_preprint":false},{"pmid":"33823762","id":"PMC_33823762","title":"ADAMTS9-AS2: A Functional Long Non-coding RNA in Tumorigenesis.","date":"2021","source":"Current pharmaceutical 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longevity","url":"https://pubmed.ncbi.nlm.nih.gov/35401927","citation_count":10,"is_preprint":false},{"pmid":"23358566","id":"PMC_23358566","title":"Epigenetic inactivation of ADAMTS9 via promoter methylation in multiple myeloma.","date":"2013","source":"Molecular medicine reports","url":"https://pubmed.ncbi.nlm.nih.gov/23358566","citation_count":10,"is_preprint":false},{"pmid":"28244876","id":"PMC_28244876","title":"Adaptive sequence convergence of the tumor suppressor ADAMTS9 between small-bodied mammals displaying exceptional longevity.","date":"2017","source":"Aging","url":"https://pubmed.ncbi.nlm.nih.gov/28244876","citation_count":10,"is_preprint":false},{"pmid":"36746036","id":"PMC_36746036","title":"A review on the role of ADAMTS9-AS2 in different disorders.","date":"2023","source":"Pathology, research and practice","url":"https://pubmed.ncbi.nlm.nih.gov/36746036","citation_count":9,"is_preprint":false},{"pmid":"33879810","id":"PMC_33879810","title":"Delay in primordial germ cell migration in adamts9 knockout zebrafish.","date":"2021","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/33879810","citation_count":9,"is_preprint":false},{"pmid":"36449154","id":"PMC_36449154","title":"ADAMTS9-AS1 Long Non‑coding RNA Sponges miR‑128 and miR-150 to Regulate Ras/MAPK Signaling Pathway in Glioma.","date":"2022","source":"Cellular and molecular neurobiology","url":"https://pubmed.ncbi.nlm.nih.gov/36449154","citation_count":8,"is_preprint":false},{"pmid":"33621133","id":"PMC_33621133","title":"Long-Chain Noncoding RNA ADAMTS9-AS2 Regulates Proliferation, Migration, and Apoptosis in Bladder Cancer Cells Through Regulating miR-182-5p.","date":"2021","source":"Journal of interferon & cytokine research : the official journal of the International Society for Interferon and Cytokine Research","url":"https://pubmed.ncbi.nlm.nih.gov/33621133","citation_count":8,"is_preprint":false},{"pmid":"34312940","id":"PMC_34312940","title":"The diagnostic significance of circulating lncRNA ADAMTS9-AS2 tumor biomarker in non-small cell lung cancer among the Egyptian population.","date":"2021","source":"The journal of gene medicine","url":"https://pubmed.ncbi.nlm.nih.gov/34312940","citation_count":8,"is_preprint":false},{"pmid":"31413211","id":"PMC_31413211","title":"[Overexpression of the long non-coding RNA ADAMTS9-AS2 suppresses colorectal cancer proliferation and metastasis].","date":"2019","source":"Zhong nan da xue xue bao. Yi xue ban = Journal of Central South University. Medical sciences","url":"https://pubmed.ncbi.nlm.nih.gov/31413211","citation_count":8,"is_preprint":false},{"pmid":"26218657","id":"PMC_26218657","title":"Loss of C. elegans GON-1, an ADAMTS9 Homolog, Decreases Secretion Resulting in Altered Lifespan and Dauer Formation.","date":"2015","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/26218657","citation_count":8,"is_preprint":false},{"pmid":"37035301","id":"PMC_37035301","title":"Disease modeling of ADAMTS9-related nephropathy using kidney organoids reveals its roles in tubular cells and podocytes.","date":"2023","source":"Frontiers in medicine","url":"https://pubmed.ncbi.nlm.nih.gov/37035301","citation_count":7,"is_preprint":false},{"pmid":"27230574","id":"PMC_27230574","title":"Relationship between cytosine-adenine repeat polymorphism of ADAMTS9 gene and clinical and radiologic severity of knee osteoarthritis.","date":"2016","source":"International journal of rheumatic diseases","url":"https://pubmed.ncbi.nlm.nih.gov/27230574","citation_count":7,"is_preprint":false},{"pmid":"34085704","id":"PMC_34085704","title":"LncRNA ADAMTS9-AS1 knockdown restricts cell proliferation and EMT in non-small cell lung cancer.","date":"2021","source":"Histology and histopathology","url":"https://pubmed.ncbi.nlm.nih.gov/34085704","citation_count":6,"is_preprint":false},{"pmid":"27485821","id":"PMC_27485821","title":"Maternal serum ADAMTS-9 levels in gestational diabetes: a pilot study.","date":"2016","source":"The journal of maternal-fetal & neonatal medicine : the official journal of the European Association of Perinatal Medicine, the Federation of Asia and Oceania Perinatal Societies, the International Society of Perinatal Obstetricians","url":"https://pubmed.ncbi.nlm.nih.gov/27485821","citation_count":6,"is_preprint":false},{"pmid":"40143747","id":"PMC_40143747","title":"The lncRNAs PART1 and ADAMTS9-AS2 act in an antithetic manner on AR signaling and induction of cellular senescence in prostate cancer cells.","date":"2025","source":"International journal of surgery (London, England)","url":"https://pubmed.ncbi.nlm.nih.gov/40143747","citation_count":5,"is_preprint":false},{"pmid":"32335142","id":"PMC_32335142","title":"The ADAMTS9 gene is associated with mandibular retrusion in a Chinese population.","date":"2020","source":"Gene","url":"https://pubmed.ncbi.nlm.nih.gov/32335142","citation_count":5,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":55272,"output_tokens":6978,"usd":0.135243,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":16339,"output_tokens":4907,"usd":0.102185,"stage2_stop_reason":"end_turn"},"total_usd":0.237428,"stage1_batch_id":"msgbatch_0179Z2pxRYBsXi2xADneafRw","stage2_batch_id":"msgbatch_01LaY9ZaVdgjWArcZo9eqQE5","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2003,\n      \"finding\": \"ADAMTS9 is activated by selective proprotein convertase (furin) cleavage at the Arg287-Phe288 bond, as demonstrated by pulse-chase analysis, site-directed mutagenesis, and amino acid sequencing. The ancillary domains (including TSRs) are required for cell-surface localization and for versicanase/aggrecanase activity; the catalytic domain alone is insufficient.\",\n      \"method\": \"Pulse-chase analysis, site-directed mutagenesis, amino acid sequencing, cell transfection with proteolytic activity assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multiple orthogonal methods (mutagenesis, pulse-chase, sequencing) in a single rigorous study establishing both processing mechanism and domain requirements\",\n      \"pmids\": [\"12514189\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Pro-ADAMTS9 zymogen is not processed intracellularly but is secreted intact to the cell surface, where furin cleaves the propeptide extracellularly. This cell-surface furin-dependent processing was demonstrated by PC inhibitors, furin-deficient cells, furin rescue, and furin siRNA knockdown. PC5A can also process pro-ADAMTS9 but likewise only extracellularly.\",\n      \"method\": \"Pulse-chase analysis, PC inhibitors, furin-deficient cell lines, furin rescue, furin siRNA\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multiple orthogonal genetic and pharmacological approaches in a single mechanistic study\",\n      \"pmids\": [\"16537537\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"The ADAMTS9 propeptide functions as an intramolecular chaperone required for secretion: N-linked glycosylation at three consensus sites in the propeptide is essential for secretion. Furin processing at three sites (Arg74, Arg209, Arg287) paradoxically reduces rather than activates catalytic activity, with propeptide fragments retaining non-covalent association with the catalytic domain after processing.\",\n      \"method\": \"Site-directed mutagenesis of N-glycosylation and furin cleavage sites, pulse-chase, versican cleavage assays, proprotein convertase inhibitor treatment\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — mutagenesis of multiple sites combined with functional versican cleavage assays, single rigorous study with multiple orthogonal approaches\",\n      \"pmids\": [\"17403680\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Cell-surface processing of pro-ADAMTS9 is regulated by the ER chaperone GRP94/gp96, which forms an immunoprecipitable complex with pro-ADAMTS9 and furin at the cell surface. Geldanamycin (gp96/HSP90 inhibitor) decreases furin processing of pro-ADAMTS9; gp96 siRNA reduces cell-surface pro-ADAMTS9 and furin; BiP siRNA reduces cell-surface pro-ADAMTS9 but not furin.\",\n      \"method\": \"Cross-linking/mass spectrometry, co-immunoprecipitation, geldanamycin treatment, gp96 and BiP siRNA knockdown\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP, mass spectrometry identification, and siRNA knockdown with functional readout in a single study\",\n      \"pmids\": [\"19875450\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"ADAMTS9 haploinsufficiency in mice leads to reduced versican cleavage and accumulation of versican in the aortic wall and cardiac valves, demonstrating that ADAMTS9-mediated versican proteolysis is required for normal cardiovascular development and homeostasis.\",\n      \"method\": \"Adamts9+/LacZ mouse model, immunostaining for versican and cleaved versican, beta-galactosidase staining, histological analysis\",\n      \"journal\": \"Matrix biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo genetic model with direct substrate accumulation readout, single lab with multiple anatomical analyses\",\n      \"pmids\": [\"20096780\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"ADAMTS9 is expressed cell-autonomously in microvascular endothelial cells and acts as an angiogenesis inhibitor through its proteolytic activity: ADAMTS9 siRNA in human microvascular ECs increases filopodia, migration, and tube formation; catalytically active (but not inactive) ADAMTS9 overexpression reduces tube formation. Unlike ADAMTS1, ADAMTS9 neither cleaves thrombospondins 1/2 nor binds VEGF165.\",\n      \"method\": \"siRNA knockdown, overexpression of active vs. catalytically inactive ADAMTS9, tube formation/Matrigel assay, cell migration assay, heterotopic tumor model in ADAMTS9+/- mice\",\n      \"journal\": \"The American journal of pathology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — catalytic mutant comparison, in vitro functional assays, and in vivo mouse tumor model with multiple orthogonal approaches\",\n      \"pmids\": [\"20093484\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"ADAMTS9 suppresses tumor formation and angiogenesis in esophageal squamous cell carcinoma and nasopharyngeal carcinoma; ADAMTS9 re-expression reduces microvessel numbers in Matrigel plugs and reduces tube formation by HUVECs, associated with reduced MMP9 and VEGFA expression.\",\n      \"method\": \"Tumorigenicity assays in nude mice, in vivo Matrigel plug angiogenesis assay, conditioned medium HUVEC tube formation assay, VEGFA/MMP9 expression analysis\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo angiogenesis and tumorigenicity assays with downstream marker measurements, single lab\",\n      \"pmids\": [\"20551050\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"IL-1β and TNFα synergistically induce ADAMTS9 mRNA and protein expression in OUMS-27 chondrosarcoma cells and human chondrocytes, and this induction is mediated through the MAPK signaling pathway (p38 and MEK1/2 inhibitors SB203580 and PD98059 decrease upregulation).\",\n      \"method\": \"qRT-PCR, Northern blotting, Western blotting, pharmacological MAPK inhibitors in cytokine-stimulated cells\",\n      \"journal\": \"Arthritis and rheumatism\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological pathway dissection with protein-level confirmation, single lab\",\n      \"pmids\": [\"15880812\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"IL-1β-induced ADAMTS9 expression in chondrocytes is transcriptionally regulated by NFATc1, which binds directly to distal and proximal promoter elements of ADAMTS9, as shown by chromatin immunoprecipitation, promoter-reporter assays, and inhibition by FK506 and 11R-VIVIT.\",\n      \"method\": \"Promoter cloning, chromatin immunoprecipitation (ChIP), luciferase reporter assays, NFAT inhibitors (FK506, 11R-VIVIT), qRT-PCR\",\n      \"journal\": \"Molecular and cellular biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP demonstrating direct promoter binding plus functional reporter assays, single lab\",\n      \"pmids\": [\"19052845\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"ADAMTS9 produced by mesenchymal cells is required for umbilical vascular smooth muscle cell proliferation, differentiation, and orthogonal rotation by mediating versican proteolysis and ECM dynamics. Loss of ADAMTS9 impairs PDGFRβ/MAPK-ERK signaling and disrupts Shh signaling and primary cilium orientation in mesenchymal cells.\",\n      \"method\": \"Adamts9 gene trap (Gt) allele mice, conditional Adamts9 deletion, immunostaining for versican cleavage products, PDGFRβ/ERK pathway analysis, Shh signaling analysis, primary cilium imaging\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple genetic models (gene trap + conditional deletion), multiple mechanistic pathway readouts, in vivo validation\",\n      \"pmids\": [\"26027930\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"ADAMTS9 proteolytic cleavage of pericellular versican is required to maintain focal adhesions in uterine smooth muscle cells. Versican knockdown or exogenous versican proteolysis rescues focal adhesion phenotype caused by ADAMTS9 depletion; pericellular versican accumulation acts upstream of cytoskeletal assembly and SMC differentiation. ADAMTS9 is required for myometrial activation and parturition in mice.\",\n      \"method\": \"Conditional Adamts9 deletion in uterine SMC, ADAMTS9 siRNA knockdown, versican siRNA, exogenous versican proteolysis, focal adhesion immunostaining, parturition phenotype analysis\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO in vivo plus epistasis experiments (versican KD rescues phenotype), multiple orthogonal methods in single study\",\n      \"pmids\": [\"29642006\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"POFUT2-mediated O-fucosylation of ADAMTS9 thrombospondin type 1 repeats is required for ADAMTS9 secretion. CRISPR/Cas9 knockout of POFUT2 in HEK293T cells blocks ADAMTS9 secretion. Conditional deletion evidence shows that loss of ADAMTS9 in extra-embryonic tissues (not epiblast) is responsible for gastrulation defects in Pofut2 mutants.\",\n      \"method\": \"CRISPR/Cas9 knockout of POFUT2 in HEK293T cells, Cre-mediated conditional deletion of Pofut2 and Adamts9, comparison of knockout phenotypes, ADAMTS9 secretion assay\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — biochemical secretion assay combined with multiple conditional genetic models demonstrating tissue-specific epistasis\",\n      \"pmids\": [\"27297885\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"ADAMTS9 binds fibronectin through multiple sites identified by yeast two-hybrid and confirmed by solid-phase binding assays and surface plasmon resonance. Catalytically active ADAMTS9 disrupts fibronectin fibril networks formed by fibroblasts; ADAMTS9-deficient RPE1 cells assemble a more robust fibronectin network. LC-MS identified a cleavage site at Gly2196-Leu2197 in the linker between fibronectin modules III17 and I10.\",\n      \"method\": \"Yeast two-hybrid screen, solid-phase binding assay, surface plasmon resonance, fibronectin fibril disruption assay, ADAMTS9-deficient cell lines, targeted LC-MS of fibronectin cleavage products\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro binding reconstitution with SPR, catalytic mutant comparison, mass spectrometry identification of cleavage site, loss-of-function cell model\",\n      \"pmids\": [\"31085586\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"ADAMTS9 (and its C. elegans ortholog GON-1) has a novel intracellular function in promoting ER-to-Golgi protein transport, mediated by its C-terminal GON domain and independent of its protease activity. Knockdown of ADAMTS9 in human cells inhibits this transport, and the GON domain expressed in the ER rescues the phenotype.\",\n      \"method\": \"siRNA knockdown of ADAMTS9 in human cells, expression of GON domain constructs, ER-to-Golgi transport assays, C. elegans GON-1 loss-of-function genetics\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional rescue with domain construct plus parallel C. elegans validation, single lab\",\n      \"pmids\": [\"22419820\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"ADAMTS9 overexpression in skeletal muscle impairs insulin signaling through alterations in the integrin β1 signaling pathway and cytoskeletal organization, and leads to mitochondrial dysfunction. Mice lacking Adamts9 selectively in skeletal muscle have improved insulin sensitivity. The ADAMTS9 rs4607103 C risk allele is associated with increased ADAMTS9 expression and decreased insulin sensitivity in human skeletal muscle.\",\n      \"method\": \"Muscle-specific Adamts9 knockout mice (insulin clamp studies), ADAMTS9 overexpression in skeletal muscle, integrin β1 and cytoskeletal marker analysis, mitochondrial function assays, human genetic association with expression data\",\n      \"journal\": \"Diabetes\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo KO and overexpression models with mechanistic pathway analysis, single lab, human data supporting translational relevance\",\n      \"pmids\": [\"30626608\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"In C. elegans, loss of GON-1 (ADAMTS9 ortholog) impairs secretion of insulin orthologs and TGF-β, alters insulin/IGF-1 signaling in peripheral tissues, and affects lifespan and dauer formation. These functions require the GON domain but not the protease domain.\",\n      \"method\": \"C. elegans GON-1 loss-of-function genetics, protein secretion assays, dauer/lifespan phenotype analysis, domain rescue experiments\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic model with domain rescue and secretion assays, single lab, C. elegans ortholog\",\n      \"pmids\": [\"26218657\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"In mouse cartilage lacking ADAMTS-4 and ADAMTS-5 catalytic activity, ADAMTS-9 is upregulated by retinoic acid and cleaves aggrecan at E↓G bonds (rather than the E↓A bonds cleaved by ADAMTS-4/5), demonstrating a distinct aggrecanase specificity for ADAMTS-9 that may support normal skeletal development.\",\n      \"method\": \"Microarray of TS-4/5Δcat mouse cartilage explants, immunohistochemistry for ADAMTS-9 in growth plate, aggrecan cleavage site analysis\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic double-null model combined with cleavage site characterization, single lab\",\n      \"pmids\": [\"30699963\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"ADAMTS9 (and ADAMTS20) cleaves membrane type 1-matrix metalloproteinase (MT1-MMP) at Tyr314-Gly315 in the hinge region (between catalytic and hemopexin domains) and at a second site in the hemopexin domain, dependent on hinge O-glycosylation. Loss of ADAMTS9/20 increases MT1-MMP retention on the cell surface and increases pro-MMP2 activation. MT1-MMP knockdown in ADAMTS9/20-deficient cells restores focal adhesions but not ciliogenesis.\",\n      \"method\": \"Quantitative terminomics (TAILS), gene-edited RPE-1 cells lacking ADAMTS9, re-expression of ADAMTS9/ADAMTS20, MT1-MMP ectodomain shedding assay, pro-MMP2 activation assay, MT1-MMP siRNA epistasis\",\n      \"journal\": \"Molecular & cellular proteomics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — unbiased quantitative degradomics with orthogonal validation by re-expression and epistasis experiments identifying a novel substrate and cleavage sites\",\n      \"pmids\": [\"37169079\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"ADAMTS9 expression is silenced in gastric cancer by DNMT3A-mediated promoter hypermethylation; RNF180 ubiquitinates DNMT3A leading to its proteasomal degradation, thereby restoring ADAMTS9 expression. Restored ADAMTS9 expression suppresses GC cell viability and motility. ADAMTS9 is enriched in the nuclei of gastric mucosal cells and significantly alters gene expression profiles.\",\n      \"method\": \"ADAMTS9 re-expression in gastric cancer cells, RNA-sequencing, DNMT3A and RNF180 manipulation, ubiquitination assay, methylation analysis\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional re-expression plus epigenetic regulatory pathway characterization, single lab\",\n      \"pmids\": [\"33931579\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"METTL3-mediated m6A RNA modification leads to YTHDF2-dependent degradation of ADAMTS9 mRNA in gastric cancer, suppressing ADAMTS9 protein levels and facilitating angiogenesis and carcinogenesis via the ADAMTS9-mediated PI3K/AKT pathway.\",\n      \"method\": \"METTL3 overexpression/knockdown, phenotypic assays, YTHDF2-dependent mRNA stability assays, ADAMTS9 rescue experiments, PI3K/AKT pathway analysis\",\n      \"journal\": \"Frontiers in oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — epistasis rescue experiment linking METTL3-m6A-YTHDF2 axis to ADAMTS9 mRNA stability, single lab\",\n      \"pmids\": [\"35574388\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"In zebrafish, gonadotropin (hCG/LH analog) induces adamts9 expression in preovulatory follicles via Lhcgr and its associated cAMP and PKC signaling pathways, as shown by dose-response, lhcgr-/- and pgr-/- zebrafish follicle experiments.\",\n      \"method\": \"hCG dose-response in zebrafish follicles in vitro, lhcgr-/- and pgr-/- zebrafish genetic models, cAMP and PKC pathway inhibitors\",\n      \"journal\": \"Molecular and cellular endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic receptor knockout models with pharmacological pathway dissection, single lab\",\n      \"pmids\": [\"31586455\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Adamts9 is required for ovarian development and ovulation in zebrafish; adamts9-/- female fish have small ovaries with few mature oocytes, and no ovulated oocytes were observed, establishing ADAMTS9 as necessary for oocyte maturation/ovulation.\",\n      \"method\": \"CRISPR/Cas9 adamts9 knockout zebrafish, histological examination of gonads\",\n      \"journal\": \"General and comparative endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo genetic knockout with defined gonadal phenotype, single lab\",\n      \"pmids\": [\"30951722\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"ENU-induced dominant Adamts9 mutations (Und3 and Und4) cause loss of melanocytes in the mouse tail epidermis at ~E18.5, with evidence for a cell-autonomous requirement in melanocytes. TAILS N-terminomics proteomics identified new candidate ADAMTS9 substrates in skin ECM.\",\n      \"method\": \"ENU mutagenesis, conditional Adamts9 allele, TAILS N-terminomics proteomics of skin ECM\",\n      \"journal\": \"Pigment cell & melanoma research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional allele establishing cell-autonomy plus unbiased substrate discovery proteomics, single lab\",\n      \"pmids\": [\"29781574\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Mechanical strain attenuates cytokine-induced ADAMTS9 expression in chondrocytes via the mechanosensitive TRPV1 channel, which inhibits NF-κB translocation to the nucleus; TRPV1 pharmacological inhibitors and siRNA abolish this effect.\",\n      \"method\": \"Cyclic tensile strain on chondrocytes, TRPV1 pharmacological inhibitors (gadolinium, ruthenium red), TRPV1 siRNA, NF-κB nuclear translocation assay, qRT-PCR\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological and siRNA mechanistic dissection of mechanosensing pathway, single lab\",\n      \"pmids\": [\"31415758\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"ADAMTS9 knockout in kidney organoids derived from human iPSCs reduces the number of primary cilia, recapitulating renal ciliopathy. Single-cell transcriptomics show highest ADAMTS9 expression in podocytes and proximal tubules; loss increases Wnt/PCP signaling activity in podocyte clusters.\",\n      \"method\": \"ADAMTS9 knockout hiPSC-derived kidney organoids, single-cell RNA sequencing, primary cilia quantification\",\n      \"journal\": \"Frontiers in medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — human organoid KO model with single-cell transcriptomics and direct cilia phenotype readout, single lab\",\n      \"pmids\": [\"37035301\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"ADAMTS9 conditional deletion in mouse uterine smooth muscle cells demonstrates a requirement for myometrial activation and parturition, acting through pericellular versican proteolysis to maintain focal adhesions upstream of cytoskeletal assembly and SMC differentiation.\",\n      \"method\": \"Conditional Adamts9 deletion in uterine SMC (Cre-lox), versican immunostaining, focal adhesion marker analysis, parturition phenotype\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional genetic model with substrate-level and signaling pathway validation, in vivo phenotype\",\n      \"pmids\": [\"29642006\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"B3GLCT (β3-glucosyltransferase) inactivation differentially affects ADAMTS9 and ADAMTS20 function; ADAMTS9 is partially reduced (not abolished) by B3GLCT loss, causing eye abnormalities and contributing to cleft palate in mice, whereas white spotting and hydrocephalus arise from ADAMTS20 loss.\",\n      \"method\": \"B3glct knockout mouse alleles, genetic rescue experiments, biochemical secretion assays for ADAMTS9 and ADAMTS20\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic and biochemical epistasis dissecting two ADAMTS targets of B3GLCT, single lab\",\n      \"pmids\": [\"31600785\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ADAMTS9 is a secreted zinc metalloprotease that undergoes cell-surface (not intracellular) furin-mediated propeptide cleavage—facilitated by the chaperones GRP94/gp96 and BiP—whose propeptide glycosylation is required for secretion and whose processing paradoxically reduces rather than activates catalytic activity; once active, it cleaves extracellular matrix proteoglycans (versican at Glu441-Ala442, aggrecan at Glu1771-Ala1772 and at E↓G bonds), fibronectin at Gly2196-Leu2197, and the transmembrane metalloprotease MT1-MMP in its hinge and hemopexin domains; its C-terminal GON domain independently promotes ER-to-Golgi protein transport; through ECM remodeling it regulates focal adhesion maintenance, smooth muscle cell differentiation, primary cilium biogenesis, angiogenesis, cardiovascular development, ovarian/gonadal development, melanocyte maintenance, and skeletal muscle insulin sensitivity via integrin β1 signaling, while its expression is induced by IL-1β/TNFα through NFATc1 and MAPK pathways and suppressed by mechanical strain via TRPV1/NF-κB, with the gene frequently silenced by promoter hypermethylation (partly via DNMT3A) or by METTL3/YTHDF2-dependent mRNA degradation in multiple cancers.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"ADAMTS9 is a secreted zinc metalloprotease that remodels the pericellular and extracellular matrix to control cardiovascular, gonadal, skeletal, and vascular development [#4, #9, #21]. It is synthesized as a zymogen that is secreted intact and processed at the cell surface by furin (and PC5A) at the Arg287-Phe288 bond rather than intracellularly [#0, #1]; its propeptide acts as an intramolecular chaperone requiring N-linked glycosylation for secretion, and—paradoxically—furin processing reduces rather than activates catalytic activity, with cleaved propeptide fragments remaining non-covalently associated with the catalytic domain [#2]. Cell-surface processing is organized by the chaperones GRP94/gp96 and BiP, which form a complex with pro-ADAMTS9 and furin [#3], while secretion additionally requires POFUT2-mediated O-fucosylation and B3GLCT-mediated glucosylation of its thrombospondin type 1 repeats [#11, #26]. The ancillary (TSR-containing) domains, not the catalytic domain alone, are required for cell-surface localization and substrate cleavage [#0]. Active ADAMTS9 cleaves matrix proteoglycans—versican and aggrecan (the latter at E↓G bonds distinct from ADAMTS-4/5) [#2, #4, #16]—as well as fibronectin at Gly2196-Leu2197 [#12] and the transmembrane metalloprotease MT1-MMP in its hinge and hemopexin domains, limiting MT1-MMP surface retention and pro-MMP2 activation [#17]. Through pericellular versican proteolysis ADAMTS9 maintains focal adhesions upstream of cytoskeletal assembly and smooth muscle cell differentiation, drives PDGFRβ/ERK and Hedgehog signaling, supports primary cilium biogenesis, and is required for myometrial activation and parturition [#9, #10, #24, #17]; it also acts cell-autonomously as an angiogenesis inhibitor through its catalytic activity [#5]. Independent of protease function, its C-terminal GON domain promotes ER-to-Golgi protein transport [#13]. Expression is induced by IL-1β/TNFα via MAPK signaling and NFATc1-mediated transcription [#7, #8], attenuated by mechanical strain through TRPV1-dependent suppression of NF-κB [#23], and silenced in cancers by DNMT3A-driven promoter hypermethylation or METTL3/YTHDF2-dependent mRNA degradation [#18, #19].\",\n  \"teleology\": [\n    {\n      \"year\": 2003,\n      \"claim\": \"Established how the latent zymogen becomes active and which regions are needed, answering whether the catalytic domain alone suffices for proteoglycan cleavage.\",\n      \"evidence\": \"Pulse-chase, site-directed mutagenesis, and amino acid sequencing in transfected cells with proteolytic assays\",\n      \"pmids\": [\"12514189\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve where processing occurs (intra- vs. extracellular)\", \"Mechanism by which TSR-containing ancillary domains direct localization not defined\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Resolved the cellular location of activation, showing the zymogen is secreted intact and processed at the cell surface rather than within the secretory pathway.\",\n      \"evidence\": \"Pulse-chase with PC inhibitors, furin-deficient cells, furin rescue, and furin siRNA\",\n      \"pmids\": [\"16537537\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of surface processing not yet linked to activity change\", \"Chaperones organizing surface processing unknown\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Reframed propeptide processing as a secretion/chaperone requirement rather than an activation step, since furin cleavage reduced catalytic activity.\",\n      \"evidence\": \"Mutagenesis of N-glycosylation and furin sites with versican cleavage assays\",\n      \"pmids\": [\"17403680\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of propeptide retention on catalytic domain unresolved\", \"Physiological trigger that fully activates the enzyme not identified\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Identified the chaperone machinery coordinating surface processing, explaining how an ER chaperone influences extracellular furin cleavage.\",\n      \"evidence\": \"Cross-linking/MS, reciprocal co-IP, geldanamycin, and gp96/BiP siRNA with functional readout\",\n      \"pmids\": [\"19875450\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How an ER chaperone reaches the cell surface not mechanistically defined\", \"Stoichiometry of the pro-ADAMTS9/furin/gp96 complex unknown\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Demonstrated that TSR glycosylation is a gatekeeper for secretion, linking a glycosyltransferase to ADAMTS9 trafficking and developmental requirement.\",\n      \"evidence\": \"CRISPR POFUT2 knockout secretion assay plus conditional Pofut2/Adamts9 deletion epistasis\",\n      \"pmids\": [\"27297885\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether other TSR modifications act redundantly not fully resolved\", \"Substrate repertoire affected by secretion failure not mapped\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Provided the first in vivo evidence that versican proteolysis by ADAMTS9 is required for normal cardiovascular structure.\",\n      \"evidence\": \"Adamts9+/LacZ haploinsufficient mice with versican and cleaved-versican immunostaining\",\n      \"pmids\": [\"20096780\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cell types responsible for cardiovascular phenotype not delineated here\", \"Downstream signaling consequences of versican accumulation not addressed\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Defined ADAMTS9 as a catalytically dependent endothelial angiogenesis inhibitor distinct in mechanism from ADAMTS1.\",\n      \"evidence\": \"siRNA, active vs. inactive overexpression, tube formation/migration assays, and ADAMTS9+/- tumor model\",\n      \"pmids\": [\"20093484\", \"20551050\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Endothelial substrate driving anti-angiogenic effect not identified\", \"Relationship between ECM cleavage and VEGFA/MMP9 changes correlative\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Connected versican proteolysis to vascular smooth muscle morphogenesis and primary cilium-linked signaling, moving from substrate accumulation to downstream pathways.\",\n      \"evidence\": \"Adamts9 gene trap and conditional deletion mice with PDGFRβ/ERK, Shh, and cilium readouts\",\n      \"pmids\": [\"26027930\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct molecular link between versican turnover and ciliary signaling unclear\", \"Whether ECM cleavage products signal directly not established\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Placed pericellular versican proteolysis upstream of focal adhesion maintenance and SMC differentiation, providing an epistatic mechanism for the tissue phenotype.\",\n      \"evidence\": \"Conditional uterine SMC Adamts9 deletion with versican knockdown rescue and parturition analysis\",\n      \"pmids\": [\"29642006\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Receptor reading versican accumulation to focal adhesions not identified here\", \"Generalizability beyond uterine SMC untested\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Expanded the substrate repertoire beyond proteoglycans by identifying fibronectin as a direct binding partner and cleavage target affecting matrix fibril assembly.\",\n      \"evidence\": \"Yeast two-hybrid, SPR/solid-phase binding, fibril disruption, ADAMTS9-deficient cells, and LC-MS cleavage-site mapping\",\n      \"pmids\": [\"31085586\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo relevance of fibronectin cleavage not yet demonstrated\", \"Which phenotypes depend on fibronectin vs. proteoglycan substrates unresolved\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Revealed a protease-independent intracellular role in ER-to-Golgi transport mediated by the GON domain, broadening ADAMTS9 function beyond ECM proteolysis.\",\n      \"evidence\": \"ADAMTS9 siRNA, GON-domain rescue constructs, transport assays, and C. elegans GON-1 genetics\",\n      \"pmids\": [\"22419820\", \"26218657\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular partners of the GON domain in transport unknown\", \"Relationship between secretory function and extracellular protease role unclear\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Identified MT1-MMP as a transmembrane substrate, linking ADAMTS9 to control of cell-surface metalloprotease activity and ciliogenesis versus focal adhesions.\",\n      \"evidence\": \"TAILS degradomics, gene-edited RPE-1 cells, re-expression, shedding/pro-MMP2 assays, and MT1-MMP siRNA epistasis\",\n      \"pmids\": [\"37169079\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Why MT1-MMP knockdown rescues focal adhesions but not ciliogenesis unexplained\", \"In vivo significance of MT1-MMP cleavage not established\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Linked ADAMTS9 to metabolic regulation, showing muscle-specific gain and loss of function alter integrin β1 signaling and insulin sensitivity in line with a human risk allele.\",\n      \"evidence\": \"Muscle-specific knockout/overexpression mice with clamp studies and human eQTL association\",\n      \"pmids\": [\"30626608\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct substrate mediating integrin β1 signaling changes unidentified\", \"Causality of human risk-allele association limited to correlation\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Characterized epigenetic and post-transcriptional silencing of ADAMTS9 in cancer, defining how its tumor-suppressive expression is lost.\",\n      \"evidence\": \"Re-expression with RNA-seq, DNMT3A/RNF180 manipulation and methylation analysis; METTL3/YTHDF2 mRNA-stability and PI3K/AKT rescue assays\",\n      \"pmids\": [\"33931579\", \"35574388\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether nuclear ADAMTS9 enrichment reflects a direct function unresolved\", \"Substrate basis of tumor suppression in these cancers not defined\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Modeled the ciliary requirement in a human system, tying ADAMTS9 loss to reduced primary cilia and altered Wnt/PCP signaling in kidney cell types.\",\n      \"evidence\": \"ADAMTS9-knockout hiPSC kidney organoids with single-cell RNA-seq and cilia quantification\",\n      \"pmids\": [\"37035301\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Substrate driving ciliary defect in organoids not identified\", \"Direct vs. indirect effect on Wnt/PCP signaling unresolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How ADAMTS9's distinct activities—ECM proteolysis, MT1-MMP regulation, and GON-domain-mediated secretion—are integrated to produce specific developmental and disease phenotypes remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unifying structural model connecting domains to substrate selection\", \"The receptor/effector that translates ECM cleavage into focal adhesion and ciliary signaling is unidentified\", \"In vivo relevance of fibronectin and MT1-MMP cleavage not tested in mammals\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 2, 4, 12, 17]},\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [0, 12, 17]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 1, 3]},\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [4, 5, 12]},\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [13]},\n      {\"term_id\": \"GO:0031012\", \"supporting_discovery_ids\": [4, 9, 12]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1474244\", \"supporting_discovery_ids\": [4, 9, 10, 12]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [9, 11, 21, 26]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [13]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [0, 1, 17]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"FURIN\", \"PCSK5\", \"HSP90B1\", \"HSPA5\", \"POFUT2\", \"B3GLCT\", \"FN1\", \"MMP14\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":8,"faith_pct":87.5}}