{"gene":"OMD","run_date":"2026-06-10T05:19:52","timeline":{"discoveries":[{"year":1998,"finding":"Osteoadherin (OMD/osteoadherin) was isolated from bovine bone as a keratan sulfate proteoglycan that binds hydroxyapatite and promotes osteoblast attachment in vitro as efficiently as fibronectin; cell binding is mediated by the integrin αvβ3, which was the only integrin isolated by osteoadherin affinity chromatography of surface-iodinated osteoblast extracts.","method":"Protein purification, affinity chromatography, integrin pulldown, cell attachment assay","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1/2 / Strong — direct biochemical isolation, affinity chromatography identifying αvβ3, functional cell attachment assay, replicated across multiple methods in one rigorous study","pmids":["9566981"],"is_preprint":false},{"year":1998,"finding":"The primary structure of osteoadherin was determined, revealing a central region of 11 B-type leucine-rich repeats, a highly acidic C-terminal domain unique among SLRP family members, six N-linked glycosylation sites, and four putative tyrosine sulfation sites; the protein shows highest sequence identity (42%) to keratocan and is expressed exclusively in bone among bovine tissues.","method":"cDNA sequencing from primary bovine osteoblast library, Northern blot, in situ hybridization","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — full primary structure determination by cDNA sequencing, confirmed by Northern blot and in situ hybridization, foundational structural characterization","pmids":["9642227"],"is_preprint":false},{"year":2009,"finding":"The N-terminal tyrosine sulfate-rich domain of osteoadherin binds heparin-binding proteins including bFGF-2, thrombospondin I, MMP13, the NC4 domain of collagen IX, and interleukin-10, as well as basic cluster-containing polypeptides from PRELP, chondroadherin, and oncostatin M; affinity depends on the number and position of sulfated tyrosine residues.","method":"Solid phase binding assay, ion-exchange chromatography fractionation of N-terminal fragments","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — solid phase binding assays with multiple protein partners, fractionation to assess sulfation dependence, single lab but multiple orthogonal binding experiments","pmids":["19700767"],"is_preprint":false},{"year":2008,"finding":"Overexpression of osteoadherin in MC3T3E1 osteoblasts increased alkaline phosphatase activity, in vitro mineralization, and osteocalcin/osteoglycin expression, while reducing proliferation and migration; conversely, shRNA-mediated repression increased proliferation and migration and reduced alkaline phosphatase activity, demonstrating that OSAD enhances osteoblast differentiation and maturation.","method":"Stable transfection with OSAD cDNA or shRNA, ALP activity assay, mineralization assay, gene expression analysis","journal":"Calcified tissue international","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal gain- and loss-of-function in cell culture with multiple functional readouts, single lab","pmids":["18496725"],"is_preprint":false},{"year":2006,"finding":"The proximal promoter region of OSAD contains binding sites for Smad-3, Smad-4, and AP-1; TGF-β1 downregulates OSAD expression while BMP-2 upregulates it, establishing OSAD as a downstream transcriptional target differentially regulated by TGF-β family signaling.","method":"In silico promoter analysis, reporter assay, qRT-PCR, cell treatment with TGF-β1 and BMP-2","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — promoter reporter assay combined with in silico analysis and gene expression measurement, single lab","pmids":["16970923"],"is_preprint":false},{"year":2002,"finding":"TGF-β1 stimulates OSAD synthesis in mature odontoblasts and upregulates OSAD gene expression in early secretory odontoblasts and pulpal fibroblasts; TGF-β1 signaling components TβRI, TβRII, SMAD-2, SMAD-3, and SMAD-4 are present in these dental cells and are maintained after culture.","method":"Immunohistochemistry, semi-quantitative RT-PCR, TGF-β1 stimulation of thick-slice tooth cultures and explant cultures","journal":"Connective tissue research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — IHC and RT-PCR with TGF-β1 stimulation in two culture systems, single lab","pmids":["12489179"],"is_preprint":false},{"year":2019,"finding":"Overexpression of Omd in MC3T3-E1 osteoblasts increased cell viability and decreased caspase 3/7 activity, while siRNA knockdown decreased viable cell numbers and increased caspase 3/7 activity; BMP2 induced Omd expression in C2C12 cells, and reporter assays showed that Smad1 and Smad4 co-transfection activated the Omd gene promoter, indicating that osteoadherin regulates osteoblast apoptosis downstream of BMP2/Smad signaling.","method":"Overexpression, siRNA knockdown, caspase 3/7 activity assay, viability assay, reporter assay, BMP2 stimulation","journal":"International journal of molecular medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal gain/loss-of-function with functional readouts and promoter reporter assay, single lab","pmids":["31638177"],"is_preprint":false},{"year":2013,"finding":"During endochondral bone formation, distinct pools of osteoadherin with differing glycosylation patterns are produced: non-mineral-bound OSAD lacks keratan sulfate chains throughout development, while mineral-bound OSAD acquires increasing keratan sulfate substitution as bone matures, indicating that glycosylation state of OSAD is regulated during mineralization.","method":"Sequential enzymatic digestion, Western blot, quantitative gene expression, light and electron microscopy on mineral/non-mineral protein fractions","journal":"Bone","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — biochemical fractionation and enzymatic digestion with multiple analytical methods, single lab","pmids":["23337037"],"is_preprint":false},{"year":2012,"finding":"OSAD localizes specifically in the predentin layer of the developing mouse tooth with accumulation at the mineralization front, and lies in close association with collagen fibers as demonstrated by immunogold electron microscopy; OSAD expression was significantly increased by mineralization-inducing factors in rat dental pulp cells, specifically following matrix maturation and mineral deposition.","method":"Immunohistochemistry, immunogold electron microscopy with quantification, gene expression analysis of dental pulp cells under mineralization conditions","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — quantitative iEM localization combined with functional gene expression assay, single lab but multiple orthogonal methods","pmids":["22355375"],"is_preprint":false},{"year":2002,"finding":"Ultrastructural immunolocalization in rat bone showed OSAD concentrated in the mineralized bone matrix, especially at the border between bone and cartilage remnants in metaphyseal trabeculi, with a distribution pattern strikingly similar to bone sialoprotein (BSP), confirmed by double labeling; this supports a role for OSAD in the mineralization process possibly acting in concert with BSP.","method":"Immunohistochemistry, immunogold electron microscopy, quantitative marker density measurement, double labeling","journal":"Calcified tissue international","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — quantitative immunogold EM with double labeling for localization, single lab","pmids":["12384815"],"is_preprint":false},{"year":2004,"finding":"αvβ3 integrin expression in human odontoblasts co-localizes with osteoadherin in predentin, and differentiating odontoblasts in vitro express αvβ3 integrin at intercellular contacts and then throughout the cell membrane, suggesting αvβ3 mediates odontoblast adhesion to the predentin/dentin matrix through osteoadherin.","method":"Immunohistochemistry, in vitro odontoblast differentiation, co-localization analysis","journal":"Journal of dental research","confidence":"Low","confidence_rationale":"Tier 3 / Weak — co-localization by IHC only, no direct binding assay in this study, single lab","pmids":["15218045"],"is_preprint":false},{"year":2005,"finding":"The OMD (osteomodulin) gene at chromosome 9 participates in an aneurysmal bone cyst translocation t(9;17) that creates an OMD-USP6 fusion oncogene, where the OMD promoter drives overexpression of the USP6/TRE17 coding sequences in the bone/mesenchymal context.","method":"Cytogenetic characterization of tumor translocations, molecular cloning of fusion gene, demonstration that OMD promoter is juxtaposed to USP6 coding region","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct molecular characterization of chromosomal translocation breakpoints with identification of fusion gene structure, single lab but multiple tumor cases analyzed","pmids":["15735689"],"is_preprint":false},{"year":2025,"finding":"ATF4 transcriptionally upregulates OMD and STC2 by binding to their promoter regions in human aortic smooth muscle cells undergoing calcification; ATF4-driven OMD upregulation activates the PI3K/AKT signaling pathway, promoting osteogenic differentiation, and AAV-mediated ATF4 knockdown in vivo suppressed OMD and STC2 expression and reduced calcium deposition.","method":"Transcriptomic sequencing, iRegulon transcription factor prediction, ChIP/promoter binding validation, in vitro calcification model, in vivo AAV-shATF4 mouse model, Western blot for pathway markers","journal":"Pathology, research and practice","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro and in vivo functional validation with promoter binding and pathway activation assays, single lab","pmids":["41274065"],"is_preprint":false}],"current_model":"Osteoadherin (OMD) is a mineralized-tissue-specific keratan sulfate proteoglycan of the class II SLRP family that is expressed by mature osteoblasts and odontoblasts; it promotes osteoblast attachment via αvβ3 integrin, binds hydroxyapatite, sequesters heparin-binding growth factors/cytokines/MMPs through its tyrosine-sulfated N-terminal domain, enhances osteoblast differentiation and mineralization while suppressing apoptosis downstream of BMP2/Smad signaling, is transcriptionally regulated by TGF-β1 (negative) and BMP-2/ATF4 (positive), and its glycosylation profile dynamically changes during bone formation with distinct mineral-bound versus non-mineral-bound pools serving potentially different roles in directing mineralization."},"narrative":{"mechanistic_narrative":"Osteoadherin (OMD/osteomodulin) is a mineralized-tissue small leucine-rich proteoglycan that couples cell adhesion to matrix mineralization in bone and tooth [PMID:9566981, PMID:9642227]. Originally isolated from bovine bone as a keratan sulfate proteoglycan that binds hydroxyapatite and promotes osteoblast attachment as efficiently as fibronectin, it engages cells through the integrin αvβ3, the only integrin recovered by osteoadherin affinity chromatography [PMID:9566981]. Its primary structure comprises a central array of leucine-rich repeats, a uniquely acidic C-terminal domain, N-linked glycosylation sites, and tyrosine sulfation sites, with mineralized-tissue-restricted expression [PMID:9642227]. The tyrosine sulfate-rich N-terminal domain sequesters heparin-binding ligands including bFGF-2, thrombospondin I, MMP13, the NC4 domain of collagen IX, and interleukin-10, with affinity scaling with the number and position of sulfated tyrosines [PMID:19700767]. Functionally, OMD drives osteoblast maturation: gain and loss of function reciprocally control alkaline phosphatase activity, mineralization, and differentiation marker expression while restraining proliferation and migration [PMID:18496725], and it limits osteoblast apoptosis by suppressing caspase 3/7 activity [PMID:31638177]. Transcriptionally, OMD is differentially controlled by TGF-β family signaling—downregulated by TGF-β1 and upregulated by BMP-2 via Smad1/Smad4 acting on its promoter [PMID:16970923, PMID:31638177]—and is induced by ATF4, which in vascular smooth muscle drives OMD-dependent PI3K/AKT activation and osteogenic calcification [PMID:41274065]. OMD concentrates at the mineralization front in bone and predentin, co-distributing with bone sialoprotein and collagen fibers, with distinct mineral-bound (increasingly keratan sulfate-substituted) and non-mineral-bound (keratan sulfate-poor) pools produced during bone formation [PMID:23337037, PMID:22355375, PMID:12384815]. A recurrent t(9;17) translocation places the OMD promoter upstream of USP6 coding sequences to generate an OMD-USP6 fusion oncogene in aneurysmal bone cyst [PMID:15735689].","teleology":[{"year":1998,"claim":"Established OMD as a distinct bone matrix proteoglycan and identified its adhesive mechanism, answering what molecule mediates osteoblast attachment to mineralized matrix.","evidence":"Protein purification from bovine bone, hydroxyapatite binding, integrin affinity pulldown, and cell attachment assays; cDNA sequencing with Northern blot and in situ hybridization","pmids":["9566981","9642227"],"confidence":"High","gaps":["No structural model of the LRR-integrin interface","Functional role of the unique acidic C-terminal domain not tested","In vivo requirement for adhesion not established by knockout"]},{"year":2002,"claim":"Localized OMD to the bone mineralization front alongside bone sialoprotein, indicating a spatial role in directing mineral deposition.","evidence":"Quantitative immunogold electron microscopy with double labeling in rat bone","pmids":["12384815"],"confidence":"Medium","gaps":["Co-distribution with BSP does not demonstrate functional cooperation","No causal test of OMD effect on mineral nucleation in vivo"]},{"year":2002,"claim":"Showed TGF-β1 regulates OMD synthesis in odontoblasts, linking the proteoglycan to dental matrix signaling.","evidence":"Immunohistochemistry and RT-PCR with TGF-β1 stimulation of tooth slice and explant cultures","pmids":["12489179"],"confidence":"Medium","gaps":["Direction of regulation in dental cells differs in context from bone studies","Promoter elements mediating the response not mapped here"]},{"year":2006,"claim":"Defined OMD as a transcriptional target differentially controlled by TGF-β versus BMP signaling, clarifying how its expression is positioned in osteogenic pathways.","evidence":"In silico promoter analysis, reporter assays, qRT-PCR with TGF-β1 and BMP-2 treatment","pmids":["16970923"],"confidence":"Medium","gaps":["Direct Smad/AP-1 promoter occupancy not shown by ChIP","Opposing TGF-β/BMP effects mechanism unresolved"]},{"year":2008,"claim":"Demonstrated OMD functionally promotes osteoblast differentiation rather than merely marking it, via reciprocal gain/loss of function.","evidence":"Stable OSAD overexpression and shRNA knockdown in MC3T3-E1 with ALP, mineralization, and marker assays","pmids":["18496725"],"confidence":"Medium","gaps":["Single cell line, single lab","Molecular mediator linking OMD to differentiation gene program unknown"]},{"year":2009,"claim":"Identified the tyrosine sulfate-rich N-terminal domain as a sulfation-dependent docking site for heparin-binding effectors, providing a mechanism for growth factor/cytokine/protease sequestration.","evidence":"Solid-phase binding assays and ion-exchange fractionation of N-terminal fragments against multiple partners","pmids":["19700767"],"confidence":"Medium","gaps":["Binding shown in vitro; physiological sequestration not demonstrated in tissue","Functional consequences of each ligand interaction untested"]},{"year":2012,"claim":"Refined dental localization to predentin and the mineralization front in association with collagen, with induction following matrix maturation.","evidence":"Immunohistochemistry, quantitative immunogold EM, and gene expression in mineralizing dental pulp cells","pmids":["22355375"],"confidence":"Medium","gaps":["Collagen association not mapped to a binding domain","Causal role in dentin mineralization not tested"]},{"year":2013,"claim":"Revealed regulated glycosylation generating distinct mineral-bound versus non-mineral-bound OMD pools, suggesting glycoform-specific roles in mineralization.","evidence":"Sequential enzymatic digestion, Western blot, gene expression, and microscopy of mineral/non-mineral fractions during endochondral bone formation","pmids":["23337037"],"confidence":"Medium","gaps":["Functional difference between glycoforms not directly tested","Enzymes controlling keratan sulfate substitution unidentified"]},{"year":2019,"claim":"Placed OMD downstream of BMP2/Smad signaling as a suppressor of osteoblast apoptosis, extending its role beyond differentiation.","evidence":"Overexpression/siRNA with caspase 3/7 and viability assays, BMP2 induction, and Smad1/Smad4 promoter reporter assays","pmids":["31638177"],"confidence":"Medium","gaps":["Anti-apoptotic effector pathway downstream of OMD not defined","Single cell line context"]},{"year":2025,"claim":"Connected ATF4-driven OMD expression to PI3K/AKT activation and osteogenic differentiation in vascular calcification, demonstrating OMD function outside skeletal tissue.","evidence":"Transcriptomics, promoter binding validation, in vitro calcification, and in vivo AAV-shATF4 mouse model with pathway Western blots","pmids":["41274065"],"confidence":"Medium","gaps":["Mechanism linking OMD to PI3K/AKT activation unresolved","Direct ATF4 occupancy versus indirect induction not fully separated"]},{"year":2005,"claim":"Identified the OMD locus as a promoter donor in an aneurysmal bone cyst translocation, implicating its tissue-specific expression in driving an oncogenic fusion.","evidence":"Cytogenetic and molecular cloning of t(9;17) breakpoints generating an OMD-USP6 fusion","pmids":["15735689"],"confidence":"Medium","gaps":["OMD protein function not involved—only its promoter is co-opted","Contribution to tumorigenesis is via USP6 overexpression"]},{"year":null,"claim":"Whether OMD is required in vivo for skeletal mineralization and how its glycoform pools and N-terminal ligand sequestration shape the bone microenvironment remain unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No knockout/loss-of-function whole-organism phenotype in the corpus","Physiological consequences of N-terminal heparin-binding ligand sequestration untested","Functional distinction between mineral-bound and non-mineral-bound glycoforms unestablished"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098631","term_label":"cell adhesion mediator activity","supporting_discovery_ids":[0]},{"term_id":"GO:0140313","term_label":"molecular sequestering activity","supporting_discovery_ids":[2]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[0,1]}],"localization":[{"term_id":"GO:0031012","term_label":"extracellular matrix","supporting_discovery_ids":[8,9]},{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[0,9]}],"pathway":[],"complexes":[],"partners":["ITGAV","ITGB3","FGF2","MMP13","THBS1","COL9A1","IL10"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q99983","full_name":"Osteomodulin","aliases":["Keratan sulfate proteoglycan osteomodulin","KSPG osteomodulin","Osteoadherin","OSAD"],"length_aa":421,"mass_kda":49.5,"function":"May be implicated in biomineralization processes. Has a function in binding of osteoblasts via the alpha(V)beta(3)-integrin","subcellular_location":"Secreted, extracellular space, extracellular matrix","url":"https://www.uniprot.org/uniprotkb/Q99983/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/OMD","classification":"Not Classified","n_dependent_lines":1,"n_total_lines":1208,"dependency_fraction":0.0008278145695364238},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/OMD","total_profiled":1310},"omim":[{"mim_id":"618926","title":"OSTEOMODULIN; OMD","url":"https://www.omim.org/entry/618926"},{"mim_id":"613587","title":"OCCULT MACULAR DYSTROPHY; OCMD","url":"https://www.omim.org/entry/613587"},{"mim_id":"608643","title":"AROMATIC L-AMINO ACID DECARBOXYLASE DEFICIENCY; AADCD","url":"https://www.omim.org/entry/608643"},{"mim_id":"608135","title":"ASPORIN; ASPN","url":"https://www.omim.org/entry/608135"},{"mim_id":"602238","title":"EXOSOME COMPONENT 2; EXOSC2","url":"https://www.omim.org/entry/602238"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Endoplasmic reticulum","reliability":"Approved"},{"location":"Nucleoli fibrillar center","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"blood vessel","ntpm":63.3}],"url":"https://www.proteinatlas.org/search/OMD"},"hgnc":{"alias_symbol":["osteoadherin","SLRR2C"],"prev_symbol":[]},"alphafold":{"accession":"Q99983","domains":[{"cath_id":"3.80.10.10","chopping":"250-261_274-382","consensus_level":"medium","plddt":93.0244,"start":250,"end":382}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q99983","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q99983-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q99983-F1-predicted_aligned_error_v6.png","plddt_mean":82.25},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=OMD","jax_strain_url":"https://www.jax.org/strain/search?query=OMD"},"sequence":{"accession":"Q99983","fasta_url":"https://rest.uniprot.org/uniprotkb/Q99983.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q99983/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q99983"}},"corpus_meta":[{"pmid":"15735689","id":"PMC_15735689","title":"Aneurysmal bone 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Neurons","date":"2025-06-15","source":"bioRxiv","url":"https://doi.org/10.1101/2025.06.15.659789","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":15528,"output_tokens":3291,"usd":0.047975,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":10864,"output_tokens":3969,"usd":0.076772,"stage2_stop_reason":"end_turn"},"total_usd":0.124747,"stage1_batch_id":"msgbatch_013a8chtv3AWyTqv4z4sEF4C","stage2_batch_id":"msgbatch_01AHsuW63vinsvuTgzmQ3n62","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1998,\n      \"finding\": \"Osteoadherin (OMD/osteoadherin) was isolated from bovine bone as a keratan sulfate proteoglycan that binds hydroxyapatite and promotes osteoblast attachment in vitro as efficiently as fibronectin; cell binding is mediated by the integrin αvβ3, which was the only integrin isolated by osteoadherin affinity chromatography of surface-iodinated osteoblast extracts.\",\n      \"method\": \"Protein purification, affinity chromatography, integrin pulldown, cell attachment assay\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 / Strong — direct biochemical isolation, affinity chromatography identifying αvβ3, functional cell attachment assay, replicated across multiple methods in one rigorous study\",\n      \"pmids\": [\"9566981\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"The primary structure of osteoadherin was determined, revealing a central region of 11 B-type leucine-rich repeats, a highly acidic C-terminal domain unique among SLRP family members, six N-linked glycosylation sites, and four putative tyrosine sulfation sites; the protein shows highest sequence identity (42%) to keratocan and is expressed exclusively in bone among bovine tissues.\",\n      \"method\": \"cDNA sequencing from primary bovine osteoblast library, Northern blot, in situ hybridization\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — full primary structure determination by cDNA sequencing, confirmed by Northern blot and in situ hybridization, foundational structural characterization\",\n      \"pmids\": [\"9642227\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"The N-terminal tyrosine sulfate-rich domain of osteoadherin binds heparin-binding proteins including bFGF-2, thrombospondin I, MMP13, the NC4 domain of collagen IX, and interleukin-10, as well as basic cluster-containing polypeptides from PRELP, chondroadherin, and oncostatin M; affinity depends on the number and position of sulfated tyrosine residues.\",\n      \"method\": \"Solid phase binding assay, ion-exchange chromatography fractionation of N-terminal fragments\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — solid phase binding assays with multiple protein partners, fractionation to assess sulfation dependence, single lab but multiple orthogonal binding experiments\",\n      \"pmids\": [\"19700767\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Overexpression of osteoadherin in MC3T3E1 osteoblasts increased alkaline phosphatase activity, in vitro mineralization, and osteocalcin/osteoglycin expression, while reducing proliferation and migration; conversely, shRNA-mediated repression increased proliferation and migration and reduced alkaline phosphatase activity, demonstrating that OSAD enhances osteoblast differentiation and maturation.\",\n      \"method\": \"Stable transfection with OSAD cDNA or shRNA, ALP activity assay, mineralization assay, gene expression analysis\",\n      \"journal\": \"Calcified tissue international\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal gain- and loss-of-function in cell culture with multiple functional readouts, single lab\",\n      \"pmids\": [\"18496725\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"The proximal promoter region of OSAD contains binding sites for Smad-3, Smad-4, and AP-1; TGF-β1 downregulates OSAD expression while BMP-2 upregulates it, establishing OSAD as a downstream transcriptional target differentially regulated by TGF-β family signaling.\",\n      \"method\": \"In silico promoter analysis, reporter assay, qRT-PCR, cell treatment with TGF-β1 and BMP-2\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — promoter reporter assay combined with in silico analysis and gene expression measurement, single lab\",\n      \"pmids\": [\"16970923\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"TGF-β1 stimulates OSAD synthesis in mature odontoblasts and upregulates OSAD gene expression in early secretory odontoblasts and pulpal fibroblasts; TGF-β1 signaling components TβRI, TβRII, SMAD-2, SMAD-3, and SMAD-4 are present in these dental cells and are maintained after culture.\",\n      \"method\": \"Immunohistochemistry, semi-quantitative RT-PCR, TGF-β1 stimulation of thick-slice tooth cultures and explant cultures\",\n      \"journal\": \"Connective tissue research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — IHC and RT-PCR with TGF-β1 stimulation in two culture systems, single lab\",\n      \"pmids\": [\"12489179\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Overexpression of Omd in MC3T3-E1 osteoblasts increased cell viability and decreased caspase 3/7 activity, while siRNA knockdown decreased viable cell numbers and increased caspase 3/7 activity; BMP2 induced Omd expression in C2C12 cells, and reporter assays showed that Smad1 and Smad4 co-transfection activated the Omd gene promoter, indicating that osteoadherin regulates osteoblast apoptosis downstream of BMP2/Smad signaling.\",\n      \"method\": \"Overexpression, siRNA knockdown, caspase 3/7 activity assay, viability assay, reporter assay, BMP2 stimulation\",\n      \"journal\": \"International journal of molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal gain/loss-of-function with functional readouts and promoter reporter assay, single lab\",\n      \"pmids\": [\"31638177\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"During endochondral bone formation, distinct pools of osteoadherin with differing glycosylation patterns are produced: non-mineral-bound OSAD lacks keratan sulfate chains throughout development, while mineral-bound OSAD acquires increasing keratan sulfate substitution as bone matures, indicating that glycosylation state of OSAD is regulated during mineralization.\",\n      \"method\": \"Sequential enzymatic digestion, Western blot, quantitative gene expression, light and electron microscopy on mineral/non-mineral protein fractions\",\n      \"journal\": \"Bone\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — biochemical fractionation and enzymatic digestion with multiple analytical methods, single lab\",\n      \"pmids\": [\"23337037\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"OSAD localizes specifically in the predentin layer of the developing mouse tooth with accumulation at the mineralization front, and lies in close association with collagen fibers as demonstrated by immunogold electron microscopy; OSAD expression was significantly increased by mineralization-inducing factors in rat dental pulp cells, specifically following matrix maturation and mineral deposition.\",\n      \"method\": \"Immunohistochemistry, immunogold electron microscopy with quantification, gene expression analysis of dental pulp cells under mineralization conditions\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — quantitative iEM localization combined with functional gene expression assay, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"22355375\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Ultrastructural immunolocalization in rat bone showed OSAD concentrated in the mineralized bone matrix, especially at the border between bone and cartilage remnants in metaphyseal trabeculi, with a distribution pattern strikingly similar to bone sialoprotein (BSP), confirmed by double labeling; this supports a role for OSAD in the mineralization process possibly acting in concert with BSP.\",\n      \"method\": \"Immunohistochemistry, immunogold electron microscopy, quantitative marker density measurement, double labeling\",\n      \"journal\": \"Calcified tissue international\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — quantitative immunogold EM with double labeling for localization, single lab\",\n      \"pmids\": [\"12384815\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"αvβ3 integrin expression in human odontoblasts co-localizes with osteoadherin in predentin, and differentiating odontoblasts in vitro express αvβ3 integrin at intercellular contacts and then throughout the cell membrane, suggesting αvβ3 mediates odontoblast adhesion to the predentin/dentin matrix through osteoadherin.\",\n      \"method\": \"Immunohistochemistry, in vitro odontoblast differentiation, co-localization analysis\",\n      \"journal\": \"Journal of dental research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — co-localization by IHC only, no direct binding assay in this study, single lab\",\n      \"pmids\": [\"15218045\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"The OMD (osteomodulin) gene at chromosome 9 participates in an aneurysmal bone cyst translocation t(9;17) that creates an OMD-USP6 fusion oncogene, where the OMD promoter drives overexpression of the USP6/TRE17 coding sequences in the bone/mesenchymal context.\",\n      \"method\": \"Cytogenetic characterization of tumor translocations, molecular cloning of fusion gene, demonstration that OMD promoter is juxtaposed to USP6 coding region\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct molecular characterization of chromosomal translocation breakpoints with identification of fusion gene structure, single lab but multiple tumor cases analyzed\",\n      \"pmids\": [\"15735689\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"ATF4 transcriptionally upregulates OMD and STC2 by binding to their promoter regions in human aortic smooth muscle cells undergoing calcification; ATF4-driven OMD upregulation activates the PI3K/AKT signaling pathway, promoting osteogenic differentiation, and AAV-mediated ATF4 knockdown in vivo suppressed OMD and STC2 expression and reduced calcium deposition.\",\n      \"method\": \"Transcriptomic sequencing, iRegulon transcription factor prediction, ChIP/promoter binding validation, in vitro calcification model, in vivo AAV-shATF4 mouse model, Western blot for pathway markers\",\n      \"journal\": \"Pathology, research and practice\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro and in vivo functional validation with promoter binding and pathway activation assays, single lab\",\n      \"pmids\": [\"41274065\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"Osteoadherin (OMD) is a mineralized-tissue-specific keratan sulfate proteoglycan of the class II SLRP family that is expressed by mature osteoblasts and odontoblasts; it promotes osteoblast attachment via αvβ3 integrin, binds hydroxyapatite, sequesters heparin-binding growth factors/cytokines/MMPs through its tyrosine-sulfated N-terminal domain, enhances osteoblast differentiation and mineralization while suppressing apoptosis downstream of BMP2/Smad signaling, is transcriptionally regulated by TGF-β1 (negative) and BMP-2/ATF4 (positive), and its glycosylation profile dynamically changes during bone formation with distinct mineral-bound versus non-mineral-bound pools serving potentially different roles in directing mineralization.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"Osteoadherin (OMD/osteomodulin) is a mineralized-tissue small leucine-rich proteoglycan that couples cell adhesion to matrix mineralization in bone and tooth [#0, #1]. Originally isolated from bovine bone as a keratan sulfate proteoglycan that binds hydroxyapatite and promotes osteoblast attachment as efficiently as fibronectin, it engages cells through the integrin \\u03b1v\\u03b23, the only integrin recovered by osteoadherin affinity chromatography [#0]. Its primary structure comprises a central array of leucine-rich repeats, a uniquely acidic C-terminal domain, N-linked glycosylation sites, and tyrosine sulfation sites, with mineralized-tissue-restricted expression [#1]. The tyrosine sulfate-rich N-terminal domain sequesters heparin-binding ligands including bFGF-2, thrombospondin I, MMP13, the NC4 domain of collagen IX, and interleukin-10, with affinity scaling with the number and position of sulfated tyrosines [#2]. Functionally, OMD drives osteoblast maturation: gain and loss of function reciprocally control alkaline phosphatase activity, mineralization, and differentiation marker expression while restraining proliferation and migration [#3], and it limits osteoblast apoptosis by suppressing caspase 3/7 activity [#6]. Transcriptionally, OMD is differentially controlled by TGF-\\u03b2 family signaling\\u2014downregulated by TGF-\\u03b21 and upregulated by BMP-2 via Smad1/Smad4 acting on its promoter [#4, #6]\\u2014and is induced by ATF4, which in vascular smooth muscle drives OMD-dependent PI3K/AKT activation and osteogenic calcification [#12]. OMD concentrates at the mineralization front in bone and predentin, co-distributing with bone sialoprotein and collagen fibers, with distinct mineral-bound (increasingly keratan sulfate-substituted) and non-mineral-bound (keratan sulfate-poor) pools produced during bone formation [#7, #8, #9]. A recurrent t(9;17) translocation places the OMD promoter upstream of USP6 coding sequences to generate an OMD-USP6 fusion oncogene in aneurysmal bone cyst [#11].\",\n  \"teleology\": [\n    {\n      \"year\": 1998,\n      \"claim\": \"Established OMD as a distinct bone matrix proteoglycan and identified its adhesive mechanism, answering what molecule mediates osteoblast attachment to mineralized matrix.\",\n      \"evidence\": \"Protein purification from bovine bone, hydroxyapatite binding, integrin affinity pulldown, and cell attachment assays; cDNA sequencing with Northern blot and in situ hybridization\",\n      \"pmids\": [\n        \"9566981\",\n        \"9642227\"\n      ],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No structural model of the LRR-integrin interface\",\n        \"Functional role of the unique acidic C-terminal domain not tested\",\n        \"In vivo requirement for adhesion not established by knockout\"\n      ]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Localized OMD to the bone mineralization front alongside bone sialoprotein, indicating a spatial role in directing mineral deposition.\",\n      \"evidence\": \"Quantitative immunogold electron microscopy with double labeling in rat bone\",\n      \"pmids\": [\n        \"12384815\"\n      ],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Co-distribution with BSP does not demonstrate functional cooperation\",\n        \"No causal test of OMD effect on mineral nucleation in vivo\"\n      ]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Showed TGF-\\u03b21 regulates OMD synthesis in odontoblasts, linking the proteoglycan to dental matrix signaling.\",\n      \"evidence\": \"Immunohistochemistry and RT-PCR with TGF-\\u03b21 stimulation of tooth slice and explant cultures\",\n      \"pmids\": [\n        \"12489179\"\n      ],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Direction of regulation in dental cells differs in context from bone studies\",\n        \"Promoter elements mediating the response not mapped here\"\n      ]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Defined OMD as a transcriptional target differentially controlled by TGF-\\u03b2 versus BMP signaling, clarifying how its expression is positioned in osteogenic pathways.\",\n      \"evidence\": \"In silico promoter analysis, reporter assays, qRT-PCR with TGF-\\u03b21 and BMP-2 treatment\",\n      \"pmids\": [\n        \"16970923\"\n      ],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Direct Smad/AP-1 promoter occupancy not shown by ChIP\",\n        \"Opposing TGF-\\u03b2/BMP effects mechanism unresolved\"\n      ]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Demonstrated OMD functionally promotes osteoblast differentiation rather than merely marking it, via reciprocal gain/loss of function.\",\n      \"evidence\": \"Stable OSAD overexpression and shRNA knockdown in MC3T3-E1 with ALP, mineralization, and marker assays\",\n      \"pmids\": [\n        \"18496725\"\n      ],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Single cell line, single lab\",\n        \"Molecular mediator linking OMD to differentiation gene program unknown\"\n      ]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Identified the tyrosine sulfate-rich N-terminal domain as a sulfation-dependent docking site for heparin-binding effectors, providing a mechanism for growth factor/cytokine/protease sequestration.\",\n      \"evidence\": \"Solid-phase binding assays and ion-exchange fractionation of N-terminal fragments against multiple partners\",\n      \"pmids\": [\n        \"19700767\"\n      ],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Binding shown in vitro; physiological sequestration not demonstrated in tissue\",\n        \"Functional consequences of each ligand interaction untested\"\n      ]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Refined dental localization to predentin and the mineralization front in association with collagen, with induction following matrix maturation.\",\n      \"evidence\": \"Immunohistochemistry, quantitative immunogold EM, and gene expression in mineralizing dental pulp cells\",\n      \"pmids\": [\n        \"22355375\"\n      ],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Collagen association not mapped to a binding domain\",\n        \"Causal role in dentin mineralization not tested\"\n      ]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Revealed regulated glycosylation generating distinct mineral-bound versus non-mineral-bound OMD pools, suggesting glycoform-specific roles in mineralization.\",\n      \"evidence\": \"Sequential enzymatic digestion, Western blot, gene expression, and microscopy of mineral/non-mineral fractions during endochondral bone formation\",\n      \"pmids\": [\n        \"23337037\"\n      ],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Functional difference between glycoforms not directly tested\",\n        \"Enzymes controlling keratan sulfate substitution unidentified\"\n      ]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Placed OMD downstream of BMP2/Smad signaling as a suppressor of osteoblast apoptosis, extending its role beyond differentiation.\",\n      \"evidence\": \"Overexpression/siRNA with caspase 3/7 and viability assays, BMP2 induction, and Smad1/Smad4 promoter reporter assays\",\n      \"pmids\": [\n        \"31638177\"\n      ],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Anti-apoptotic effector pathway downstream of OMD not defined\",\n        \"Single cell line context\"\n      ]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Connected ATF4-driven OMD expression to PI3K/AKT activation and osteogenic differentiation in vascular calcification, demonstrating OMD function outside skeletal tissue.\",\n      \"evidence\": \"Transcriptomics, promoter binding validation, in vitro calcification, and in vivo AAV-shATF4 mouse model with pathway Western blots\",\n      \"pmids\": [\n        \"41274065\"\n      ],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Mechanism linking OMD to PI3K/AKT activation unresolved\",\n        \"Direct ATF4 occupancy versus indirect induction not fully separated\"\n      ]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Identified the OMD locus as a promoter donor in an aneurysmal bone cyst translocation, implicating its tissue-specific expression in driving an oncogenic fusion.\",\n      \"evidence\": \"Cytogenetic and molecular cloning of t(9;17) breakpoints generating an OMD-USP6 fusion\",\n      \"pmids\": [\n        \"15735689\"\n      ],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"OMD protein function not involved\\u2014only its promoter is co-opted\",\n        \"Contribution to tumorigenesis is via USP6 overexpression\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Whether OMD is required in vivo for skeletal mineralization and how its glycoform pools and N-terminal ligand sequestration shape the bone microenvironment remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No knockout/loss-of-function whole-organism phenotype in the corpus\",\n        \"Physiological consequences of N-terminal heparin-binding ligand sequestration untested\",\n        \"Functional distinction between mineral-bound and non-mineral-bound glycoforms unestablished\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\n        \"term_id\": \"GO:0098631\",\n        \"supporting_discovery_ids\": [\n          0\n        ]\n      },\n      {\n        \"term_id\": \"GO:0140313\",\n        \"supporting_discovery_ids\": [\n          2\n        ]\n      },\n      {\n        \"term_id\": \"GO:0005198\",\n        \"supporting_discovery_ids\": [\n          0,\n          1\n        ]\n      }\n    ],\n    \"localization\": [\n      {\n        \"term_id\": \"GO:0031012\",\n        \"supporting_discovery_ids\": [\n          8,\n          9\n        ]\n      },\n      {\n        \"term_id\": \"GO:0005578\",\n        \"supporting_discovery_ids\": []\n      },\n      {\n        \"term_id\": \"GO:0005576\",\n        \"supporting_discovery_ids\": [\n          0,\n          9\n        ]\n      }\n    ],\n    \"pathway\": [\n      {\n        \"term_id\": \"GO:0001503\",\n        \"supporting_discovery_ids\": []\n      }\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"ITGAV\",\n      \"ITGB3\",\n      \"FGF2\",\n      \"MMP13\",\n      \"THBS1\",\n      \"COL9A1\",\n      \"IL10\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}