{"gene":"COL3A1","run_date":"2026-04-28T17:28:53","timeline":{"discoveries":[{"year":1988,"finding":"A multi-exon deletion in one COL3A1 allele produces shortened pro-α1(III) chains that form triple helices of reduced length (~780 amino acids), with decreased thermal stability, impaired secretion, and defective processing of the mutant procollagen molecules.","method":"Biochemical analysis of cultured skin fibroblasts, protein gel analysis, thermal stability assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — in vitro biochemical reconstitution with multiple orthogonal methods in foundational EDS IV mutation paper","pmids":["2834369"],"is_preprint":false},{"year":1990,"finding":"A glycine-to-arginine substitution at position 619 of the α1(III) chain (COL3A1 G619R) causes synthesis of type III procollagen with decreased thermal unfolding temperature, demonstrating that glycine substitutions in the triple-helical domain destabilize the collagen molecule.","method":"DNA sequencing of cultured skin fibroblast cDNA, thermal unfolding assay","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 1 — direct mutagenesis identification plus thermal stability assay, foundational study","pmids":["2243125"],"is_preprint":false},{"year":1990,"finding":"Identical G+1 splice-site mutations in three different introns of COL3A1 produce distinct aberrant splicing patterns (exon skipping, cryptic splice site use, intron retention), with the pattern determined by the relative rates of normal splicing of adjacent introns rather than the strength of cryptic splice sites.","method":"RNA sequencing, cDNA analysis, comparison of splicing outcomes across multiple mutation sites","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — direct mechanistic comparison of three natural mutations with multiple orthogonal splicing analyses","pmids":["2365710"],"is_preprint":false},{"year":1990,"finding":"A G+1 to A mutation at intron 20 of COL3A1 causes aberrant RNA splicing (both cryptic splice site use and intron retention), producing abnormal type III procollagen and causing aortic aneurysms.","method":"DNA sequencing of PCR products from cultured skin fibroblasts, RNA splicing analysis","journal":"American journal of human genetics","confidence":"High","confidence_rationale":"Tier 1 — direct mutation characterization with mechanistic RNA splicing analysis","pmids":["2349939"],"is_preprint":false},{"year":1990,"finding":"A single base mutation at the splice donor site of intron 41 of COL3A1 leads to exon 41 skipping, removing the mammalian collagenase cleavage site (Gly781-Ile782) and the cyanogen bromide cleavage site (Met797), rendering the mutant collagen resistant to both enzymes; fibroblasts produce normal homotrimers, mutant homotrimers, and mixed heterotrimers.","method":"cDNA sequencing, chemical cleavage of heteroduplexes, protein analysis, PCR of genomic DNA","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — comprehensive mechanistic characterization of splicing mutation and its biochemical consequences","pmids":["2145268"],"is_preprint":false},{"year":1992,"finding":"A glycine-1018-to-aspartate substitution in COL3A1 markedly decreases the amount of type III procollagen secreted into the medium by cultured skin fibroblasts, demonstrating that glycine substitutions near the C-terminus of the triple helix impair secretion.","method":"DNA sequencing of PCR products, fibroblast protein secretion assay","journal":"American journal of human genetics","confidence":"High","confidence_rationale":"Tier 1 — direct mutation identification with quantitative secretion assay","pmids":["1496983"],"is_preprint":false},{"year":1993,"finding":"A glycine-1021-to-glutamic-acid substitution in COL3A1 produces type III procollagen that is poorly secreted, migrates more slowly on polyacrylamide gels, and is partially unstable at 25°C to trypsin digestion, placing the protein's C-terminal triple-helix region as critical for thermal stability and protease resistance.","method":"Fibroblast protein analysis, gel electrophoresis, trypsin digestion assay","journal":"American journal of medical genetics","confidence":"High","confidence_rationale":"Tier 1 — biochemical characterization of mutant protein with multiple functional assays","pmids":["8098182"],"is_preprint":false},{"year":1997,"finding":"COL3A1 mutations causing glycine substitutions near the carboxyl-terminal end of the triple helix produce the most severe dermal phenotype: extreme dilation of rough endoplasmic reticulum (RER), thin dermis with reduced collagen, and small-diameter collagen fibrils (65–80 nm vs normal 95–110 nm), demonstrating a position-dependent effect of COL3A1 mutations on secretion, fibrillogenesis, and skin architecture.","method":"Transmission and scanning electron microscopy of skin biopsies from 22 genotyped EDS IV patients, light microscopy","journal":"The Journal of investigative dermatology","confidence":"High","confidence_rationale":"Tier 2 — systematic ultrastructural analysis of 22 patients with identified mutations, multiple mutation types compared","pmids":["9036918"],"is_preprint":false},{"year":1997,"finding":"Exon-skipping mutations in COL3A1 predominantly arise from mutations at the 5' (donor) splice site rather than the 3' (acceptor) splice site, because acceptor-site mutations preferentially lead to use of an alternative acceptor site creating a null allele with a premature termination codon rather than exon skipping.","method":"Mutation analysis of 33 unrelated EDS IV individuals, characterization of splicing outcomes","journal":"American journal of human genetics","confidence":"High","confidence_rationale":"Tier 2 — systematic analysis of 33 families with mechanistic interpretation of splice site mutation outcomes","pmids":["9399899"],"is_preprint":false},{"year":2001,"finding":"Frameshift mutations in COL3A1 that introduce premature termination codons lead to nonsense-mediated mRNA decay and functional haploinsufficiency; a mutation in the final exon produces a stable truncated protein not incorporated into mature type III procollagen trimers. Both mechanisms reduce overall type III collagen output and cause vascular EDS phenotype.","method":"RT-PCR, quantitative mRNA analysis, protein incorporation assay in cultured fibroblasts","journal":"American journal of human genetics","confidence":"High","confidence_rationale":"Tier 1–2 — direct mechanistic demonstration of NMD and failed chain incorporation in patient fibroblasts","pmids":["11577371"],"is_preprint":false},{"year":2004,"finding":"COL3A1-mutant fibroblasts (EDS type IV) fail to organize type III collagen and fibronectin into the extracellular matrix, downregulate α2β1 integrin, and recruit αvβ3 integrin instead of α5β1 integrin. Treatment with purified type III collagen restores the normal phenotype; function-blocking antibodies to type III collagen or α2β1 integrin recapitulate the EDS phenotype in control fibroblasts, demonstrating that α2β1 integrin organization is controlled by its collagen ligand.","method":"Antibody blocking, purified protein rescue experiments, immunofluorescence, cell culture functional assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 — reciprocal rescue and blocking experiments with multiple orthogonal methods","pmids":["14970208"],"is_preprint":false},{"year":2012,"finding":"Loss of Col3a1 in mice causes cobblestone-like cortical malformation with breakdown of the pial basement membrane starting at E11.5 and neuronal overmigration, identifying type III collagen as a structural component of the pial BM required for cortical lamination and a ligand for GPR56.","method":"Histological analysis of Col3a1 knockout mice, immunofluorescence, embryonic staging","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 — genetic KO with detailed phenotypic and mechanistic analysis, confirmed GPR56 ligand role","pmids":["22235340"],"is_preprint":false},{"year":2014,"finding":"A gain-of-function missense point mutation in the PIIINP (N-terminal propeptide) segment of Col3a1 is the causal mutation in Tsk2/+ mice, producing a fibrotic phenotype with excessive ECM deposition—the first documented gain-of-function Col3a1 mutation—demonstrated by in vivo and in vitro genetic complementation tests.","method":"Linkage analysis, RNA sequencing, genome capture DNA sequencing, in vivo and in vitro genetic complementation","journal":"The Journal of investigative dermatology","confidence":"High","confidence_rationale":"Tier 1–2 — genetic complementation plus sequencing provides direct mechanistic proof","pmids":["25330296"],"is_preprint":false},{"year":2018,"finding":"Dominant-negative COL3A1 mutations (glycine substitutions and in-frame splice mutations) in vEDS fibroblasts cause disassembly of ECM structural proteins (fibrillins, EMILINs, elastin), reduction of proteoglycans (perlecan, decorin, versican), disturbed ER homeostasis with altered PDI distribution, and strong reduction of the collagen-modifying enzyme FKBP22, revealing broad post-translational and ECM organizational consequences.","method":"Transcriptome profiling (microarray), protein analysis by Western blot and immunofluorescence, cultured skin fibroblasts from three vEDS patients","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2–3 — single-lab transcriptome + protein analysis in patient fibroblasts, multiple orthogonal readouts","pmids":["29346445"],"is_preprint":false},{"year":2018,"finding":"Expression of mutant type III collagen with a glycine substitution (p.Gly182Ser) in transgenic mice disturbs heterotypic type III:I collagen fibril formation in dermal and arterial extracellular matrix, reducing total collagen content and altering the collagen III:I ratio, establishing a key role for type III collagen in collagen fibrillogenesis.","method":"Transgenic mouse model, collagen content analysis, electron microscopy of collagen fibrils","journal":"Matrix biology : journal of the International Society for Matrix Biology","confidence":"High","confidence_rationale":"Tier 2 — in vivo transgenic model with ultrastructural and biochemical analysis demonstrating fibrillogenesis role","pmids":["29551664"],"is_preprint":false},{"year":2018,"finding":"ALDO-induced oxidant stress causes oxidation of Cys18 in the SMAD3 docking region of NEDD9, impairing SMAD3-NEDD9 interaction, leading to impaired NEDD9 degradation, increased NEDD9 complex formation with NKX2-5, and increased NKX2-5 binding to the COL3A1 promoter, upregulating collagen III expression in pulmonary artery endothelial cells.","method":"Microscale thermophoresis for protein-protein interaction, atomic force microscopy for cell stiffness, ChIP-like binding assay, cell culture with oxidant stress","journal":"Science translational medicine","confidence":"High","confidence_rationale":"Tier 1–2 — multiple orthogonal methods including biophysical binding assay, functional rescue, and in vivo validation","pmids":["29899023"],"is_preprint":false},{"year":2010,"finding":"Haploinsufficiency of the murine Col3a1 locus (185 kb deletion including promoter and exons 1–39) causes autosomal-dominant aortic dissection with incomplete penetrance, associated with aberrant collagen fibrillogenesis within the aortic wall but not elevated blood pressure or aneurysm formation.","method":"Spontaneous mouse mutant characterization, molecular genetic analysis, echocardiography, histology","journal":"Cardiovascular research","confidence":"High","confidence_rationale":"Tier 2 — in vivo genetic model with defined molecular lesion and mechanistic histological analysis","pmids":["21071432"],"is_preprint":false},{"year":2013,"finding":"Col3a1 haploinsufficient mice are hypersensitive to angiotensin II-induced thoracic aortic dissection and rupture, with deaths associated with low aortic collagen fibril content, demonstrating that type III collagen is required for aortic wall integrity under hemodynamic stress.","method":"Angiotensin II infusion in Col3a1+/- mice, echocardiography, histological analysis of collagen fibrils","journal":"Hypertension (Dallas, Tex. : 1979)","confidence":"High","confidence_rationale":"Tier 2 — in vivo loss-of-function with defined hemodynamic challenge and structural collagen readout","pmids":["23630948"],"is_preprint":false},{"year":2017,"finding":"Biallelic COL3A1 mutations cause a brain malformation phenotype similar to that of GPR56 (ADGRG1) mutations (cobblestone-like cortical malformation, white matter changes, cerebellar cysts), confirming the type III collagen–GPR56 axis as a regulator of cortical development and cortical lamination.","method":"Exome sequencing, brain MRI review, functional assays on dermal fibroblasts from affected individuals","journal":"Journal of medical genetics","confidence":"High","confidence_rationale":"Tier 2 — genetic epistasis with consistent phenotype across multiple families, functional fibroblast assays","pmids":["28258187"],"is_preprint":false},{"year":2015,"finding":"X-ray crystallographic analysis of the COL3A1 C-propeptide region provided structural evidence that variants in this region affect C-terminal assembly initiation of procollagen monomers, with pathogenicity correlating with structural disruption of the propeptide fold.","method":"X-ray crystallography, biochemical variant analysis, clinical phenotyping","journal":"American journal of medical genetics. Part A","confidence":"Medium","confidence_rationale":"Tier 1 — crystal structure available but functional mutagenesis not described in detail in the abstract","pmids":["25846194"],"is_preprint":false},{"year":2023,"finding":"Patient-derived ECM synthesized from vEDS donor fibroblasts harboring COL3A1 glycine substitution mutations shows increased glycosaminoglycan content, unique viscoelastic mechanical properties (increased stress relaxation time constant), and reduces human aortic endothelial cell migration speed, establishing a direct role for COL3A1 in ECM mechanics and endothelial cell behavior.","method":"Cell-derived ECM from primary donor fibroblasts, atomic force microscopy/viscoelastic mechanical testing, proteomics, cell migration assay","journal":"Acta biomaterialia","confidence":"High","confidence_rationale":"Tier 1–2 — reconstitution of patient ECM with multiple orthogonal biophysical and functional readouts","pmids":["37187299"],"is_preprint":false},{"year":2024,"finding":"RNF185, a RING finger ubiquitin E3 ligase, negatively regulates COL3A1 availability; RNF185 depletion increases COL3A1 expression and enhances prostate cancer cell migration and metastasis, effects attenuated by co-inhibition of COL3A1, identifying COL3A1 as the primary downstream mediator of RNF185-controlled migration.","method":"RNA-sequencing, shRNA knockdown, subcutaneous xenograft mouse model, co-inhibition rescue experiments","journal":"Molecular cancer research : MCR","confidence":"Medium","confidence_rationale":"Tier 2–3 — in vivo and in vitro KD with COL3A1 rescue, but E3 ligase-COL3A1 direct biochemical link not fully reconstituted","pmids":["37831068"],"is_preprint":false},{"year":2020,"finding":"METTL3-mediated m6A methylation of COL3A1 mRNA downregulates its expression; knockdown of METTL3 decreases m6A levels on COL3A1 mRNA and increases COL3A1 protein, enhancing TNBC cell migration, invasion, and adhesion, establishing COL3A1 as a direct m6A-regulated target of METTL3.","method":"siRNA knockdown, m6A sequencing, luciferase reporter, Western blot, migration/invasion assays","journal":"Frontiers in oncology","confidence":"Medium","confidence_rationale":"Tier 2–3 — mechanistic link between m6A modification and COL3A1 expression shown by multiple assays, single lab","pmids":["32766145"],"is_preprint":false},{"year":2024,"finding":"ELAVL1 (HuR) enhances COL3A1 mRNA stability and expression, while transcription factor YY1 promotes COL3A1 transcription; both mechanisms contribute to COL3A1 upregulation in cisplatin-resistant NSCLC, and COL3A1 knockdown restores DDP sensitivity in vitro and in vivo.","method":"ChIP assay, luciferase reporter assay, RNA-binding protein knockdown, xenograft experiments","journal":"Cancer biology & therapy","confidence":"Medium","confidence_rationale":"Tier 1–2 — ChIP and luciferase confirm direct YY1-COL3A1 transcriptional interaction; ELAVL1-mRNA stability supported by functional assays","pmids":["38530094"],"is_preprint":false},{"year":2021,"finding":"lnc-GULP1-2:1 regulates COL3A1 expression and promotes COL3A1 protein translocation into the nucleus in granulosa cells; overexpression of lnc-GULP1-2:1 increases COL3A1 expression and inhibits cell proliferation through CCND2 and p16, while COL3A1 silencing alone inhibits proliferation.","method":"Overexpression and silencing in KGN cells, immunofluorescence for nuclear localization, cell proliferation assays, RT-PCR","journal":"Journal of ovarian research","confidence":"Low","confidence_rationale":"Tier 3 — single lab, nuclear localization claim unusual and not mechanistically explained, indirect pathway placement","pmids":["33472700"],"is_preprint":false}],"current_model":"COL3A1 encodes the α1(III) chain, three copies of which form homotrimeric type III procollagen via C-terminal nucleation; glycine substitutions in the triple-helical domain reduce thermal stability, impair secretion (causing ER retention and RER dilation), and disrupt heterotypic type I/III collagen fibrillogenesis, while haploinsufficiency via nonsense-mediated decay also reduces collagen output—both mechanisms compromising the mechanical integrity of hollow organs and blood vessels; additionally, type III collagen serves as the extracellular ligand for GPR56 in the pial basement membrane, regulating cortical neuronal migration, and interacts with α2β1 integrin to organize fibronectin and other integrin receptors in the ECM, with its expression regulated post-transcriptionally by m6A methylation (METTL3), miR-29 family members, and transcriptionally by YY1 and NKX2-5 downstream of NEDD9/SMAD3 signaling."},"narrative":{"teleology":[{"year":1988,"claim":"The first mechanistic insight into how COL3A1 mutations cause disease came from showing that internal deletions produce shortened pro-α1(III) chains that form thermally unstable, poorly secreted procollagen, establishing a dominant-negative paradigm.","evidence":"Biochemical analysis of cultured fibroblasts from an EDS IV patient with a multi-exon deletion","pmids":["2834369"],"confidence":"High","gaps":["Only one mutation type examined","In vivo consequences of secretion impairment not tested","No quantification of ER retention"]},{"year":1990,"claim":"Systematic characterization of point mutations and splice-site mutations revealed that glycine substitutions directly destabilize the triple helix, while splice-site mutations produce context-dependent aberrant mRNAs—exon skipping, cryptic site use, or intron retention—depending on surrounding intron splicing kinetics.","evidence":"DNA sequencing, thermal unfolding assays, RNA splicing analysis across multiple COL3A1 mutations in patient fibroblasts","pmids":["2243125","2365710","2349939","2145268"],"confidence":"High","gaps":["No crystal structure of mutant triple helix available","Quantitative relationship between thermal destabilization and clinical severity not established"]},{"year":1993,"claim":"Studies of C-terminal glycine substitutions (positions 1018–1021) showed that the C-terminal region of the triple helix is critical for secretion and protease resistance, with mutations there causing the most severe ultrastructural phenotype including extreme RER dilation and thin dermis with small collagen fibrils.","evidence":"Fibroblast secretion assays, trypsin digestion, TEM/SEM of skin biopsies from 22 genotyped EDS IV patients","pmids":["1496983","8098182","9036918"],"confidence":"High","gaps":["Mechanism linking mutation position to severity of ER retention not defined at molecular level","No structural explanation for position-dependent effects"]},{"year":2001,"claim":"Demonstration that frameshift/nonsense COL3A1 mutations cause nonsense-mediated mRNA decay and haploinsufficiency—rather than a dominant-negative effect—established a second disease mechanism distinct from glycine substitutions, with truncated proteins from final-exon mutations failing to incorporate into trimers.","evidence":"RT-PCR, quantitative mRNA analysis, and protein incorporation assays in patient fibroblasts","pmids":["11577371"],"confidence":"High","gaps":["Relative severity of haploinsufficiency versus dominant-negative mechanisms not quantitatively compared","Threshold of collagen reduction sufficient for disease not defined"]},{"year":2004,"claim":"Beyond structural scaffolding, type III collagen was shown to organize integrin receptors and fibronectin in the ECM: mutant fibroblasts lose α2β1 integrin and switch to αvβ3, while exogenous type III collagen rescues the phenotype, establishing collagen III as an instructive ECM signal.","evidence":"Antibody blocking and purified protein rescue experiments with immunofluorescence in cultured fibroblasts","pmids":["14970208"],"confidence":"High","gaps":["Signaling pathways downstream of integrin switching not characterized","In vivo validation of integrin switch in vascular tissue not performed"]},{"year":2010,"claim":"In vivo haploinsufficiency models demonstrated that reduced type III collagen causes aortic dissection through aberrant collagen fibrillogenesis rather than aneurysm formation, and that this vulnerability is exacerbated by hemodynamic stress (angiotensin II).","evidence":"Col3a1 haploinsufficient mice, echocardiography, histology, and angiotensin II challenge","pmids":["21071432","23630948"],"confidence":"High","gaps":["Molecular mechanism distinguishing dissection from aneurysm not identified","Whether collagen III quantity or quality is the proximate cause of aortic wall failure remains unresolved"]},{"year":2012,"claim":"Col3a1 knockout mice revealed a non-vascular role: type III collagen is a structural component of the pial basement membrane and the ligand for GPR56, required for cortical lamination, with loss causing cobblestone-like cortical malformation from E11.5.","evidence":"Histological and immunofluorescence analysis of Col3a1 knockout mouse brains with embryonic staging","pmids":["22235340"],"confidence":"High","gaps":["Binding interface between collagen III and GPR56 not structurally defined","Cell-autonomous versus non-cell-autonomous effects on neuronal migration not resolved"]},{"year":2015,"claim":"X-ray crystallography of the COL3A1 C-propeptide provided the first structural framework for understanding how C-terminal variants disrupt chain recognition and trimerization initiation.","evidence":"X-ray crystallography and biochemical variant analysis","pmids":["25846194"],"confidence":"Medium","gaps":["Full-length procollagen trimer structure not available","Functional mutagenesis of predicted critical residues not reported in detail"]},{"year":2017,"claim":"Biallelic COL3A1 mutations in humans were shown to cause brain malformations phenocopying GPR56 mutations, confirming the collagen III–GPR56 signaling axis as a requirement for human cortical development.","evidence":"Exome sequencing and brain MRI in affected families, fibroblast functional assays","pmids":["28258187"],"confidence":"High","gaps":["Whether residual collagen III function modulates phenotypic severity not established","Downstream signaling from GPR56 activation by collagen III not fully elucidated"]},{"year":2018,"claim":"Transgenic mice expressing a glycine-substituted collagen III demonstrated that mutant chains disrupt heterotypic type III:I fibril formation, reducing total collagen content and altering the III:I ratio in vivo, while patient fibroblasts revealed broad ECM disassembly including loss of fibrillins, EMILINs, and the collagen chaperone FKBP22.","evidence":"Transgenic mouse model with EM and collagen analysis; transcriptome/proteome profiling of vEDS fibroblasts","pmids":["29551664","29346445"],"confidence":"High","gaps":["Whether ECM disassembly is a direct consequence of mutant collagen secretion or an indirect ER stress response is unclear","Role of FKBP22 loss in disease pathology not tested"]},{"year":2018,"claim":"Transcriptional regulation of COL3A1 was linked to oxidant-stress signaling: NEDD9 Cys18 oxidation disrupts SMAD3 binding, stabilizes NEDD9, and enables NKX2-5-driven COL3A1 promoter activation in pulmonary artery endothelial cells.","evidence":"Microscale thermophoresis, ChIP-like assay, AFM, cell culture with aldosterone-induced oxidant stress","pmids":["29899023"],"confidence":"High","gaps":["Whether this pathway operates in fibroblasts and vascular smooth muscle cells not tested","Contribution of this transcriptional axis to fibrotic disease not validated in vivo"]},{"year":2020,"claim":"Post-transcriptional regulation of COL3A1 was expanded to include METTL3-mediated m6A methylation that suppresses COL3A1 expression, and ELAVL1/YY1 that enhance mRNA stability and transcription respectively.","evidence":"m6A sequencing, luciferase reporters, siRNA knockdown, ChIP assays in cancer cell lines","pmids":["32766145","38530094"],"confidence":"Medium","gaps":["Physiological relevance of m6A regulation of COL3A1 in non-cancer contexts unknown","Whether METTL3 and YY1 pathways intersect not examined"]},{"year":2023,"claim":"Patient-derived ECM from vEDS fibroblasts demonstrated that COL3A1 mutations directly alter ECM viscoelastic properties and impair endothelial cell migration, providing a biophysical mechanism linking COL3A1 to vascular dysfunction.","evidence":"Cell-derived ECM reconstitution, AFM viscoelastic testing, proteomics, endothelial migration assay","pmids":["37187299"],"confidence":"High","gaps":["Whether altered viscoelasticity or specific ECM composition changes drive endothelial dysfunction is unresolved","In vivo relevance of viscoelastic changes to vascular rupture not demonstrated"]},{"year":null,"claim":"Key unresolved questions include the full-length procollagen trimer structure, the molecular basis of the collagen III–GPR56 binding interaction, the quantitative threshold of collagen III reduction sufficient for vascular rupture, and whether therapeutic supplementation with collagen III or chaperone-based approaches can rescue dominant-negative or haploinsufficient phenotypes.","evidence":"","pmids":[],"confidence":"High","gaps":["No full-length type III procollagen trimer structure","Collagen III–GPR56 binding interface not structurally resolved","No established therapeutic rescue strategy for vEDS"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[0,1,7,14,20]},{"term_id":"GO:0098631","term_label":"cell adhesion mediator activity","supporting_discovery_ids":[10,11]},{"term_id":"GO:0048018","term_label":"receptor ligand activity","supporting_discovery_ids":[11,18]}],"localization":[{"term_id":"GO:0031012","term_label":"extracellular matrix","supporting_discovery_ids":[7,10,14,20]},{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[5,6,10,14]},{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[7,13]}],"pathway":[{"term_id":"R-HSA-1474244","term_label":"Extracellular matrix organization","supporting_discovery_ids":[10,14,20]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[11,18]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[0,1,9,7]}],"complexes":["type III procollagen homotrimer","heterotypic type I/III collagen fibril"],"partners":["GPR56","ITGA2","ITGB1","FN1","NKX2-5","FKBP22","ELAVL1"],"other_free_text":[]},"mechanistic_narrative":"COL3A1 encodes the α1 chain of type III collagen, a major structural component of the extracellular matrix in skin, blood vessels, and hollow organs, where it regulates heterotypic collagen fibrillogenesis, ECM organization, and tissue mechanical integrity. Three α1(III) chains assemble into homotrimeric procollagen via C-terminal nucleation; glycine substitutions in the triple-helical domain reduce thermal stability, impair secretion with consequent ER retention and RER dilation, and produce small-diameter collagen fibrils, while haploinsufficiency through nonsense-mediated decay similarly reduces collagen output—both mechanisms cause vascular Ehlers–Danlos syndrome (vEDS) [PMID:2834369, PMID:2243125, PMID:11577371, PMID:9036918]. Type III collagen organizes fibronectin and integrin receptors (α2β1, α5β1) in the ECM and serves as the extracellular ligand for GPR56 in the pial basement membrane, with Col3a1 loss in mice causing cobblestone-like cortical malformation due to pial BM breakdown, a phenotype recapitulated by biallelic COL3A1 mutations in humans [PMID:14970208, PMID:22235340, PMID:28258187]. COL3A1 expression is regulated transcriptionally by YY1 and the NEDD9/NKX2-5 axis, and post-transcriptionally by METTL3-mediated m6A methylation and ELAVL1-dependent mRNA stabilization [PMID:29899023, PMID:32766145, PMID:38530094]."},"prefetch_data":{"uniprot":{"accession":"P02461","full_name":"Collagen alpha-1(III) chain","aliases":[],"length_aa":1466,"mass_kda":138.6,"function":"Collagen type III occurs in most soft connective tissues along with type I collagen. Involved in regulation of cortical development. Is the major ligand of ADGRG1 in the developing brain and binding to ADGRG1 inhibits neuronal migration and activates the RhoA pathway by coupling ADGRG1 to GNA13 and possibly GNA12","subcellular_location":"Secreted, extracellular space, extracellular matrix","url":"https://www.uniprot.org/uniprotkb/P02461/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/COL3A1","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/COL3A1","total_profiled":1310},"omim":[{"mim_id":"619269","title":"ODONTOCHONDRODYSPLASIA 2 WITH HEARING LOSS AND DIABETES; ODCD2","url":"https://www.omim.org/entry/619269"},{"mim_id":"618343","title":"POLYMICROGYRIA WITH OR WITHOUT VASCULAR-TYPE EHLERS-DANLOS SYNDROME; PMGEDSV","url":"https://www.omim.org/entry/618343"},{"mim_id":"612586","title":"ANEURYSM, INTRACRANIAL BERRY, 9; ANIB9","url":"https://www.omim.org/entry/612586"},{"mim_id":"612313","title":"GLASS SYNDROME; GLASS","url":"https://www.omim.org/entry/612313"},{"mim_id":"612280","title":"FUCOSIDASE, ALPHA-L, 1; FUCA1","url":"https://www.omim.org/entry/612280"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Endoplasmic reticulum","reliability":"Approved"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"cervix","ntpm":2222.3},{"tissue":"gallbladder","ntpm":1957.3},{"tissue":"placenta","ntpm":1861.3},{"tissue":"smooth muscle","ntpm":1998.4}],"url":"https://www.proteinatlas.org/search/COL3A1"},"hgnc":{"alias_symbol":[],"prev_symbol":["EDS4A"]},"alphafold":{"accession":"P02461","domains":[{"cath_id":"3.30.750.130","chopping":"1243-1297","consensus_level":"medium","plddt":95.9898,"start":1243,"end":1297},{"cath_id":"2.60.120.1000","chopping":"1301-1466","consensus_level":"high","plddt":96.4408,"start":1301,"end":1466}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P02461","model_url":"https://alphafold.ebi.ac.uk/files/AF-P02461-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P02461-F1-predicted_aligned_error_v6.png","plddt_mean":53.25},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=COL3A1","jax_strain_url":"https://www.jax.org/strain/search?query=COL3A1"},"sequence":{"accession":"P02461","fasta_url":"https://rest.uniprot.org/uniprotkb/P02461.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P02461/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P02461"}},"corpus_meta":[{"pmid":"31075413","id":"PMC_31075413","title":"Type 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medicine","url":"https://pubmed.ncbi.nlm.nih.gov/35720634","citation_count":11,"is_preprint":false},{"pmid":"8020975","id":"PMC_8020975","title":"Linkage mapping of the gene for type III collagen (COL3A1) to human chromosome 2q using a VNTR polymorphism.","date":"1994","source":"Genomics","url":"https://pubmed.ncbi.nlm.nih.gov/8020975","citation_count":11,"is_preprint":false},{"pmid":"31391389","id":"PMC_31391389","title":"Vascular Ehlers-Danlos Syndrome with a Novel Missense Mutation in COL3A1: A Man in His 50s with Aortic Dissection after Interventional Treatment for Hemothorax as the First Manifestation.","date":"2019","source":"Internal medicine (Tokyo, Japan)","url":"https://pubmed.ncbi.nlm.nih.gov/31391389","citation_count":11,"is_preprint":false},{"pmid":"28183226","id":"PMC_28183226","title":"A New COL3A1 Mutation in Ehlers-Danlos Syndrome Vascular Type With Different Phenotypes in the Same Family.","date":"2017","source":"Vascular and endovascular surgery","url":"https://pubmed.ncbi.nlm.nih.gov/28183226","citation_count":10,"is_preprint":false},{"pmid":"20720362","id":"PMC_20720362","title":"Ehlers-Danlos syndrome type IV, vascular type, which demonstrated a novel point mutation in the COL3A1 gene.","date":"2010","source":"Internal medicine (Tokyo, Japan)","url":"https://pubmed.ncbi.nlm.nih.gov/20720362","citation_count":10,"is_preprint":false},{"pmid":"35047627","id":"PMC_35047627","title":"COL3A1 and Its Related Molecules as Potential Biomarkers in the Development of Human Ewing's Sarcoma.","date":"2021","source":"BioMed research international","url":"https://pubmed.ncbi.nlm.nih.gov/35047627","citation_count":10,"is_preprint":false},{"pmid":"18389341","id":"PMC_18389341","title":"A novel COL3A1 gene mutation in patient with aortic dissected aneurysm and cervical artery dissections.","date":"2008","source":"Heart and vessels","url":"https://pubmed.ncbi.nlm.nih.gov/18389341","citation_count":10,"is_preprint":false},{"pmid":"8019562","id":"PMC_8019562","title":"Single-strand conformation polymorphism (SSCP) analysis of the COL3A1 gene detects a mutation that results in the substitution of glycine 1009 to valine and causes severe Ehlers-Danlos syndrome type IV.","date":"1994","source":"Human mutation","url":"https://pubmed.ncbi.nlm.nih.gov/8019562","citation_count":10,"is_preprint":false},{"pmid":"27799058","id":"PMC_27799058","title":"Next-generation sequencing and a novel COL3A1 mutation associated with vascular Ehlers-Danlos syndrome with severe intestinal involvement: a case report.","date":"2016","source":"Journal of medical case reports","url":"https://pubmed.ncbi.nlm.nih.gov/27799058","citation_count":9,"is_preprint":false},{"pmid":"23489429","id":"PMC_23489429","title":"A new COL3A1 mutation in Ehlers-Danlos syndrome type IV.","date":"2013","source":"Experimental dermatology","url":"https://pubmed.ncbi.nlm.nih.gov/23489429","citation_count":9,"is_preprint":false},{"pmid":"38530094","id":"PMC_38530094","title":"Role and mechanism of COL3A1 in regulating the growth, metastasis, and drug sensitivity in cisplatin-resistant non-small cell lung cancer cells.","date":"2024","source":"Cancer biology & therapy","url":"https://pubmed.ncbi.nlm.nih.gov/38530094","citation_count":9,"is_preprint":false},{"pmid":"1757960","id":"PMC_1757960","title":"Ehlers-Danlos syndrome type IV: phenotypic consequences of a splicing mutation in one COL3A1 allele.","date":"1991","source":"Journal of medical genetics","url":"https://pubmed.ncbi.nlm.nih.gov/1757960","citation_count":9,"is_preprint":false},{"pmid":"35543214","id":"PMC_35543214","title":"Nonsyndromic arteriopathy and aortopathy and vascular Ehlers-Danlos syndrome causing COL3A1 variants.","date":"2022","source":"American journal of medical genetics. Part A","url":"https://pubmed.ncbi.nlm.nih.gov/35543214","citation_count":8,"is_preprint":false},{"pmid":"37187299","id":"PMC_37187299","title":"Patient-derived extracellular matrix demonstrates role of COL3A1 in blood vessel mechanics.","date":"2023","source":"Acta biomaterialia","url":"https://pubmed.ncbi.nlm.nih.gov/37187299","citation_count":8,"is_preprint":false},{"pmid":"27476968","id":"PMC_27476968","title":"miRNA-29a targets COL3A1 to regulate the level of type III collagen in pig.","date":"2016","source":"Gene","url":"https://pubmed.ncbi.nlm.nih.gov/27476968","citation_count":8,"is_preprint":false},{"pmid":"25846194","id":"PMC_25846194","title":"Clinical, structural, biochemical and X-ray crystallographic correlates of pathogenicity for variants in the C-propeptide region of the COL3A1 gene.","date":"2015","source":"American journal of medical genetics. Part A","url":"https://pubmed.ncbi.nlm.nih.gov/25846194","citation_count":8,"is_preprint":false},{"pmid":"29377229","id":"PMC_29377229","title":"Retracted: microRNA-129-5p involved in the neuroprotective effect of dexmedetomidine on hypoxic-ischemic brain injury by targeting COL3A1 through the Wnt/β-catenin signaling pathway in neonatal rats.","date":"2018","source":"Journal of cellular biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/29377229","citation_count":8,"is_preprint":false},{"pmid":"35964930","id":"PMC_35964930","title":"Phenotype of COL3A1/COL5A2 deletion patients.","date":"2022","source":"European journal of medical genetics","url":"https://pubmed.ncbi.nlm.nih.gov/35964930","citation_count":7,"is_preprint":false},{"pmid":"37831068","id":"PMC_37831068","title":"RNF185 Control of COL3A1 Expression Limits Prostate Cancer Migration and Metastatic Potential.","date":"2024","source":"Molecular cancer research : MCR","url":"https://pubmed.ncbi.nlm.nih.gov/37831068","citation_count":7,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":48221,"output_tokens":5669,"usd":0.114849},"stage2":{"model":"claude-opus-4-6","input_tokens":9333,"output_tokens":3424,"usd":0.198398},"total_usd":0.313247,"stage1_batch_id":"msgbatch_011kfMfE81o6CTcyhVUqumuW","stage2_batch_id":"msgbatch_01DTputS6WNkH745x1nVSoBo","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1988,\n      \"finding\": \"A multi-exon deletion in one COL3A1 allele produces shortened pro-α1(III) chains that form triple helices of reduced length (~780 amino acids), with decreased thermal stability, impaired secretion, and defective processing of the mutant procollagen molecules.\",\n      \"method\": \"Biochemical analysis of cultured skin fibroblasts, protein gel analysis, thermal stability assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro biochemical reconstitution with multiple orthogonal methods in foundational EDS IV mutation paper\",\n      \"pmids\": [\"2834369\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1990,\n      \"finding\": \"A glycine-to-arginine substitution at position 619 of the α1(III) chain (COL3A1 G619R) causes synthesis of type III procollagen with decreased thermal unfolding temperature, demonstrating that glycine substitutions in the triple-helical domain destabilize the collagen molecule.\",\n      \"method\": \"DNA sequencing of cultured skin fibroblast cDNA, thermal unfolding assay\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct mutagenesis identification plus thermal stability assay, foundational study\",\n      \"pmids\": [\"2243125\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1990,\n      \"finding\": \"Identical G+1 splice-site mutations in three different introns of COL3A1 produce distinct aberrant splicing patterns (exon skipping, cryptic splice site use, intron retention), with the pattern determined by the relative rates of normal splicing of adjacent introns rather than the strength of cryptic splice sites.\",\n      \"method\": \"RNA sequencing, cDNA analysis, comparison of splicing outcomes across multiple mutation sites\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct mechanistic comparison of three natural mutations with multiple orthogonal splicing analyses\",\n      \"pmids\": [\"2365710\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1990,\n      \"finding\": \"A G+1 to A mutation at intron 20 of COL3A1 causes aberrant RNA splicing (both cryptic splice site use and intron retention), producing abnormal type III procollagen and causing aortic aneurysms.\",\n      \"method\": \"DNA sequencing of PCR products from cultured skin fibroblasts, RNA splicing analysis\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct mutation characterization with mechanistic RNA splicing analysis\",\n      \"pmids\": [\"2349939\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1990,\n      \"finding\": \"A single base mutation at the splice donor site of intron 41 of COL3A1 leads to exon 41 skipping, removing the mammalian collagenase cleavage site (Gly781-Ile782) and the cyanogen bromide cleavage site (Met797), rendering the mutant collagen resistant to both enzymes; fibroblasts produce normal homotrimers, mutant homotrimers, and mixed heterotrimers.\",\n      \"method\": \"cDNA sequencing, chemical cleavage of heteroduplexes, protein analysis, PCR of genomic DNA\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — comprehensive mechanistic characterization of splicing mutation and its biochemical consequences\",\n      \"pmids\": [\"2145268\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"A glycine-1018-to-aspartate substitution in COL3A1 markedly decreases the amount of type III procollagen secreted into the medium by cultured skin fibroblasts, demonstrating that glycine substitutions near the C-terminus of the triple helix impair secretion.\",\n      \"method\": \"DNA sequencing of PCR products, fibroblast protein secretion assay\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct mutation identification with quantitative secretion assay\",\n      \"pmids\": [\"1496983\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"A glycine-1021-to-glutamic-acid substitution in COL3A1 produces type III procollagen that is poorly secreted, migrates more slowly on polyacrylamide gels, and is partially unstable at 25°C to trypsin digestion, placing the protein's C-terminal triple-helix region as critical for thermal stability and protease resistance.\",\n      \"method\": \"Fibroblast protein analysis, gel electrophoresis, trypsin digestion assay\",\n      \"journal\": \"American journal of medical genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — biochemical characterization of mutant protein with multiple functional assays\",\n      \"pmids\": [\"8098182\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"COL3A1 mutations causing glycine substitutions near the carboxyl-terminal end of the triple helix produce the most severe dermal phenotype: extreme dilation of rough endoplasmic reticulum (RER), thin dermis with reduced collagen, and small-diameter collagen fibrils (65–80 nm vs normal 95–110 nm), demonstrating a position-dependent effect of COL3A1 mutations on secretion, fibrillogenesis, and skin architecture.\",\n      \"method\": \"Transmission and scanning electron microscopy of skin biopsies from 22 genotyped EDS IV patients, light microscopy\",\n      \"journal\": \"The Journal of investigative dermatology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — systematic ultrastructural analysis of 22 patients with identified mutations, multiple mutation types compared\",\n      \"pmids\": [\"9036918\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"Exon-skipping mutations in COL3A1 predominantly arise from mutations at the 5' (donor) splice site rather than the 3' (acceptor) splice site, because acceptor-site mutations preferentially lead to use of an alternative acceptor site creating a null allele with a premature termination codon rather than exon skipping.\",\n      \"method\": \"Mutation analysis of 33 unrelated EDS IV individuals, characterization of splicing outcomes\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — systematic analysis of 33 families with mechanistic interpretation of splice site mutation outcomes\",\n      \"pmids\": [\"9399899\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Frameshift mutations in COL3A1 that introduce premature termination codons lead to nonsense-mediated mRNA decay and functional haploinsufficiency; a mutation in the final exon produces a stable truncated protein not incorporated into mature type III procollagen trimers. Both mechanisms reduce overall type III collagen output and cause vascular EDS phenotype.\",\n      \"method\": \"RT-PCR, quantitative mRNA analysis, protein incorporation assay in cultured fibroblasts\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — direct mechanistic demonstration of NMD and failed chain incorporation in patient fibroblasts\",\n      \"pmids\": [\"11577371\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"COL3A1-mutant fibroblasts (EDS type IV) fail to organize type III collagen and fibronectin into the extracellular matrix, downregulate α2β1 integrin, and recruit αvβ3 integrin instead of α5β1 integrin. Treatment with purified type III collagen restores the normal phenotype; function-blocking antibodies to type III collagen or α2β1 integrin recapitulate the EDS phenotype in control fibroblasts, demonstrating that α2β1 integrin organization is controlled by its collagen ligand.\",\n      \"method\": \"Antibody blocking, purified protein rescue experiments, immunofluorescence, cell culture functional assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — reciprocal rescue and blocking experiments with multiple orthogonal methods\",\n      \"pmids\": [\"14970208\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Loss of Col3a1 in mice causes cobblestone-like cortical malformation with breakdown of the pial basement membrane starting at E11.5 and neuronal overmigration, identifying type III collagen as a structural component of the pial BM required for cortical lamination and a ligand for GPR56.\",\n      \"method\": \"Histological analysis of Col3a1 knockout mice, immunofluorescence, embryonic staging\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO with detailed phenotypic and mechanistic analysis, confirmed GPR56 ligand role\",\n      \"pmids\": [\"22235340\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"A gain-of-function missense point mutation in the PIIINP (N-terminal propeptide) segment of Col3a1 is the causal mutation in Tsk2/+ mice, producing a fibrotic phenotype with excessive ECM deposition—the first documented gain-of-function Col3a1 mutation—demonstrated by in vivo and in vitro genetic complementation tests.\",\n      \"method\": \"Linkage analysis, RNA sequencing, genome capture DNA sequencing, in vivo and in vitro genetic complementation\",\n      \"journal\": \"The Journal of investigative dermatology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — genetic complementation plus sequencing provides direct mechanistic proof\",\n      \"pmids\": [\"25330296\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Dominant-negative COL3A1 mutations (glycine substitutions and in-frame splice mutations) in vEDS fibroblasts cause disassembly of ECM structural proteins (fibrillins, EMILINs, elastin), reduction of proteoglycans (perlecan, decorin, versican), disturbed ER homeostasis with altered PDI distribution, and strong reduction of the collagen-modifying enzyme FKBP22, revealing broad post-translational and ECM organizational consequences.\",\n      \"method\": \"Transcriptome profiling (microarray), protein analysis by Western blot and immunofluorescence, cultured skin fibroblasts from three vEDS patients\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — single-lab transcriptome + protein analysis in patient fibroblasts, multiple orthogonal readouts\",\n      \"pmids\": [\"29346445\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Expression of mutant type III collagen with a glycine substitution (p.Gly182Ser) in transgenic mice disturbs heterotypic type III:I collagen fibril formation in dermal and arterial extracellular matrix, reducing total collagen content and altering the collagen III:I ratio, establishing a key role for type III collagen in collagen fibrillogenesis.\",\n      \"method\": \"Transgenic mouse model, collagen content analysis, electron microscopy of collagen fibrils\",\n      \"journal\": \"Matrix biology : journal of the International Society for Matrix Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo transgenic model with ultrastructural and biochemical analysis demonstrating fibrillogenesis role\",\n      \"pmids\": [\"29551664\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"ALDO-induced oxidant stress causes oxidation of Cys18 in the SMAD3 docking region of NEDD9, impairing SMAD3-NEDD9 interaction, leading to impaired NEDD9 degradation, increased NEDD9 complex formation with NKX2-5, and increased NKX2-5 binding to the COL3A1 promoter, upregulating collagen III expression in pulmonary artery endothelial cells.\",\n      \"method\": \"Microscale thermophoresis for protein-protein interaction, atomic force microscopy for cell stiffness, ChIP-like binding assay, cell culture with oxidant stress\",\n      \"journal\": \"Science translational medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — multiple orthogonal methods including biophysical binding assay, functional rescue, and in vivo validation\",\n      \"pmids\": [\"29899023\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Haploinsufficiency of the murine Col3a1 locus (185 kb deletion including promoter and exons 1–39) causes autosomal-dominant aortic dissection with incomplete penetrance, associated with aberrant collagen fibrillogenesis within the aortic wall but not elevated blood pressure or aneurysm formation.\",\n      \"method\": \"Spontaneous mouse mutant characterization, molecular genetic analysis, echocardiography, histology\",\n      \"journal\": \"Cardiovascular research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo genetic model with defined molecular lesion and mechanistic histological analysis\",\n      \"pmids\": [\"21071432\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Col3a1 haploinsufficient mice are hypersensitive to angiotensin II-induced thoracic aortic dissection and rupture, with deaths associated with low aortic collagen fibril content, demonstrating that type III collagen is required for aortic wall integrity under hemodynamic stress.\",\n      \"method\": \"Angiotensin II infusion in Col3a1+/- mice, echocardiography, histological analysis of collagen fibrils\",\n      \"journal\": \"Hypertension (Dallas, Tex. : 1979)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo loss-of-function with defined hemodynamic challenge and structural collagen readout\",\n      \"pmids\": [\"23630948\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Biallelic COL3A1 mutations cause a brain malformation phenotype similar to that of GPR56 (ADGRG1) mutations (cobblestone-like cortical malformation, white matter changes, cerebellar cysts), confirming the type III collagen–GPR56 axis as a regulator of cortical development and cortical lamination.\",\n      \"method\": \"Exome sequencing, brain MRI review, functional assays on dermal fibroblasts from affected individuals\",\n      \"journal\": \"Journal of medical genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis with consistent phenotype across multiple families, functional fibroblast assays\",\n      \"pmids\": [\"28258187\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"X-ray crystallographic analysis of the COL3A1 C-propeptide region provided structural evidence that variants in this region affect C-terminal assembly initiation of procollagen monomers, with pathogenicity correlating with structural disruption of the propeptide fold.\",\n      \"method\": \"X-ray crystallography, biochemical variant analysis, clinical phenotyping\",\n      \"journal\": \"American journal of medical genetics. Part A\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure available but functional mutagenesis not described in detail in the abstract\",\n      \"pmids\": [\"25846194\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Patient-derived ECM synthesized from vEDS donor fibroblasts harboring COL3A1 glycine substitution mutations shows increased glycosaminoglycan content, unique viscoelastic mechanical properties (increased stress relaxation time constant), and reduces human aortic endothelial cell migration speed, establishing a direct role for COL3A1 in ECM mechanics and endothelial cell behavior.\",\n      \"method\": \"Cell-derived ECM from primary donor fibroblasts, atomic force microscopy/viscoelastic mechanical testing, proteomics, cell migration assay\",\n      \"journal\": \"Acta biomaterialia\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — reconstitution of patient ECM with multiple orthogonal biophysical and functional readouts\",\n      \"pmids\": [\"37187299\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"RNF185, a RING finger ubiquitin E3 ligase, negatively regulates COL3A1 availability; RNF185 depletion increases COL3A1 expression and enhances prostate cancer cell migration and metastasis, effects attenuated by co-inhibition of COL3A1, identifying COL3A1 as the primary downstream mediator of RNF185-controlled migration.\",\n      \"method\": \"RNA-sequencing, shRNA knockdown, subcutaneous xenograft mouse model, co-inhibition rescue experiments\",\n      \"journal\": \"Molecular cancer research : MCR\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — in vivo and in vitro KD with COL3A1 rescue, but E3 ligase-COL3A1 direct biochemical link not fully reconstituted\",\n      \"pmids\": [\"37831068\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"METTL3-mediated m6A methylation of COL3A1 mRNA downregulates its expression; knockdown of METTL3 decreases m6A levels on COL3A1 mRNA and increases COL3A1 protein, enhancing TNBC cell migration, invasion, and adhesion, establishing COL3A1 as a direct m6A-regulated target of METTL3.\",\n      \"method\": \"siRNA knockdown, m6A sequencing, luciferase reporter, Western blot, migration/invasion assays\",\n      \"journal\": \"Frontiers in oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — mechanistic link between m6A modification and COL3A1 expression shown by multiple assays, single lab\",\n      \"pmids\": [\"32766145\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"ELAVL1 (HuR) enhances COL3A1 mRNA stability and expression, while transcription factor YY1 promotes COL3A1 transcription; both mechanisms contribute to COL3A1 upregulation in cisplatin-resistant NSCLC, and COL3A1 knockdown restores DDP sensitivity in vitro and in vivo.\",\n      \"method\": \"ChIP assay, luciferase reporter assay, RNA-binding protein knockdown, xenograft experiments\",\n      \"journal\": \"Cancer biology & therapy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 — ChIP and luciferase confirm direct YY1-COL3A1 transcriptional interaction; ELAVL1-mRNA stability supported by functional assays\",\n      \"pmids\": [\"38530094\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"lnc-GULP1-2:1 regulates COL3A1 expression and promotes COL3A1 protein translocation into the nucleus in granulosa cells; overexpression of lnc-GULP1-2:1 increases COL3A1 expression and inhibits cell proliferation through CCND2 and p16, while COL3A1 silencing alone inhibits proliferation.\",\n      \"method\": \"Overexpression and silencing in KGN cells, immunofluorescence for nuclear localization, cell proliferation assays, RT-PCR\",\n      \"journal\": \"Journal of ovarian research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single lab, nuclear localization claim unusual and not mechanistically explained, indirect pathway placement\",\n      \"pmids\": [\"33472700\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"COL3A1 encodes the α1(III) chain, three copies of which form homotrimeric type III procollagen via C-terminal nucleation; glycine substitutions in the triple-helical domain reduce thermal stability, impair secretion (causing ER retention and RER dilation), and disrupt heterotypic type I/III collagen fibrillogenesis, while haploinsufficiency via nonsense-mediated decay also reduces collagen output—both mechanisms compromising the mechanical integrity of hollow organs and blood vessels; additionally, type III collagen serves as the extracellular ligand for GPR56 in the pial basement membrane, regulating cortical neuronal migration, and interacts with α2β1 integrin to organize fibronectin and other integrin receptors in the ECM, with its expression regulated post-transcriptionally by m6A methylation (METTL3), miR-29 family members, and transcriptionally by YY1 and NKX2-5 downstream of NEDD9/SMAD3 signaling.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"COL3A1 encodes the α1 chain of type III collagen, a major structural component of the extracellular matrix in skin, blood vessels, and hollow organs, where it regulates heterotypic collagen fibrillogenesis, ECM organization, and tissue mechanical integrity. Three α1(III) chains assemble into homotrimeric procollagen via C-terminal nucleation; glycine substitutions in the triple-helical domain reduce thermal stability, impair secretion with consequent ER retention and RER dilation, and produce small-diameter collagen fibrils, while haploinsufficiency through nonsense-mediated decay similarly reduces collagen output—both mechanisms cause vascular Ehlers–Danlos syndrome (vEDS) [PMID:2834369, PMID:2243125, PMID:11577371, PMID:9036918]. Type III collagen organizes fibronectin and integrin receptors (α2β1, α5β1) in the ECM and serves as the extracellular ligand for GPR56 in the pial basement membrane, with Col3a1 loss in mice causing cobblestone-like cortical malformation due to pial BM breakdown, a phenotype recapitulated by biallelic COL3A1 mutations in humans [PMID:14970208, PMID:22235340, PMID:28258187]. COL3A1 expression is regulated transcriptionally by YY1 and the NEDD9/NKX2-5 axis, and post-transcriptionally by METTL3-mediated m6A methylation and ELAVL1-dependent mRNA stabilization [PMID:29899023, PMID:32766145, PMID:38530094].\",\n  \"teleology\": [\n    {\n      \"year\": 1988,\n      \"claim\": \"The first mechanistic insight into how COL3A1 mutations cause disease came from showing that internal deletions produce shortened pro-α1(III) chains that form thermally unstable, poorly secreted procollagen, establishing a dominant-negative paradigm.\",\n      \"evidence\": \"Biochemical analysis of cultured fibroblasts from an EDS IV patient with a multi-exon deletion\",\n      \"pmids\": [\"2834369\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Only one mutation type examined\", \"In vivo consequences of secretion impairment not tested\", \"No quantification of ER retention\"]\n    },\n    {\n      \"year\": 1990,\n      \"claim\": \"Systematic characterization of point mutations and splice-site mutations revealed that glycine substitutions directly destabilize the triple helix, while splice-site mutations produce context-dependent aberrant mRNAs—exon skipping, cryptic site use, or intron retention—depending on surrounding intron splicing kinetics.\",\n      \"evidence\": \"DNA sequencing, thermal unfolding assays, RNA splicing analysis across multiple COL3A1 mutations in patient fibroblasts\",\n      \"pmids\": [\"2243125\", \"2365710\", \"2349939\", \"2145268\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No crystal structure of mutant triple helix available\", \"Quantitative relationship between thermal destabilization and clinical severity not established\"]\n    },\n    {\n      \"year\": 1993,\n      \"claim\": \"Studies of C-terminal glycine substitutions (positions 1018–1021) showed that the C-terminal region of the triple helix is critical for secretion and protease resistance, with mutations there causing the most severe ultrastructural phenotype including extreme RER dilation and thin dermis with small collagen fibrils.\",\n      \"evidence\": \"Fibroblast secretion assays, trypsin digestion, TEM/SEM of skin biopsies from 22 genotyped EDS IV patients\",\n      \"pmids\": [\"1496983\", \"8098182\", \"9036918\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism linking mutation position to severity of ER retention not defined at molecular level\", \"No structural explanation for position-dependent effects\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Demonstration that frameshift/nonsense COL3A1 mutations cause nonsense-mediated mRNA decay and haploinsufficiency—rather than a dominant-negative effect—established a second disease mechanism distinct from glycine substitutions, with truncated proteins from final-exon mutations failing to incorporate into trimers.\",\n      \"evidence\": \"RT-PCR, quantitative mRNA analysis, and protein incorporation assays in patient fibroblasts\",\n      \"pmids\": [\"11577371\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative severity of haploinsufficiency versus dominant-negative mechanisms not quantitatively compared\", \"Threshold of collagen reduction sufficient for disease not defined\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Beyond structural scaffolding, type III collagen was shown to organize integrin receptors and fibronectin in the ECM: mutant fibroblasts lose α2β1 integrin and switch to αvβ3, while exogenous type III collagen rescues the phenotype, establishing collagen III as an instructive ECM signal.\",\n      \"evidence\": \"Antibody blocking and purified protein rescue experiments with immunofluorescence in cultured fibroblasts\",\n      \"pmids\": [\"14970208\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Signaling pathways downstream of integrin switching not characterized\", \"In vivo validation of integrin switch in vascular tissue not performed\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"In vivo haploinsufficiency models demonstrated that reduced type III collagen causes aortic dissection through aberrant collagen fibrillogenesis rather than aneurysm formation, and that this vulnerability is exacerbated by hemodynamic stress (angiotensin II).\",\n      \"evidence\": \"Col3a1 haploinsufficient mice, echocardiography, histology, and angiotensin II challenge\",\n      \"pmids\": [\"21071432\", \"23630948\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism distinguishing dissection from aneurysm not identified\", \"Whether collagen III quantity or quality is the proximate cause of aortic wall failure remains unresolved\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Col3a1 knockout mice revealed a non-vascular role: type III collagen is a structural component of the pial basement membrane and the ligand for GPR56, required for cortical lamination, with loss causing cobblestone-like cortical malformation from E11.5.\",\n      \"evidence\": \"Histological and immunofluorescence analysis of Col3a1 knockout mouse brains with embryonic staging\",\n      \"pmids\": [\"22235340\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Binding interface between collagen III and GPR56 not structurally defined\", \"Cell-autonomous versus non-cell-autonomous effects on neuronal migration not resolved\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"X-ray crystallography of the COL3A1 C-propeptide provided the first structural framework for understanding how C-terminal variants disrupt chain recognition and trimerization initiation.\",\n      \"evidence\": \"X-ray crystallography and biochemical variant analysis\",\n      \"pmids\": [\"25846194\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Full-length procollagen trimer structure not available\", \"Functional mutagenesis of predicted critical residues not reported in detail\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Biallelic COL3A1 mutations in humans were shown to cause brain malformations phenocopying GPR56 mutations, confirming the collagen III–GPR56 signaling axis as a requirement for human cortical development.\",\n      \"evidence\": \"Exome sequencing and brain MRI in affected families, fibroblast functional assays\",\n      \"pmids\": [\"28258187\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether residual collagen III function modulates phenotypic severity not established\", \"Downstream signaling from GPR56 activation by collagen III not fully elucidated\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Transgenic mice expressing a glycine-substituted collagen III demonstrated that mutant chains disrupt heterotypic type III:I fibril formation, reducing total collagen content and altering the III:I ratio in vivo, while patient fibroblasts revealed broad ECM disassembly including loss of fibrillins, EMILINs, and the collagen chaperone FKBP22.\",\n      \"evidence\": \"Transgenic mouse model with EM and collagen analysis; transcriptome/proteome profiling of vEDS fibroblasts\",\n      \"pmids\": [\"29551664\", \"29346445\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether ECM disassembly is a direct consequence of mutant collagen secretion or an indirect ER stress response is unclear\", \"Role of FKBP22 loss in disease pathology not tested\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Transcriptional regulation of COL3A1 was linked to oxidant-stress signaling: NEDD9 Cys18 oxidation disrupts SMAD3 binding, stabilizes NEDD9, and enables NKX2-5-driven COL3A1 promoter activation in pulmonary artery endothelial cells.\",\n      \"evidence\": \"Microscale thermophoresis, ChIP-like assay, AFM, cell culture with aldosterone-induced oxidant stress\",\n      \"pmids\": [\"29899023\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether this pathway operates in fibroblasts and vascular smooth muscle cells not tested\", \"Contribution of this transcriptional axis to fibrotic disease not validated in vivo\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Post-transcriptional regulation of COL3A1 was expanded to include METTL3-mediated m6A methylation that suppresses COL3A1 expression, and ELAVL1/YY1 that enhance mRNA stability and transcription respectively.\",\n      \"evidence\": \"m6A sequencing, luciferase reporters, siRNA knockdown, ChIP assays in cancer cell lines\",\n      \"pmids\": [\"32766145\", \"38530094\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Physiological relevance of m6A regulation of COL3A1 in non-cancer contexts unknown\", \"Whether METTL3 and YY1 pathways intersect not examined\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Patient-derived ECM from vEDS fibroblasts demonstrated that COL3A1 mutations directly alter ECM viscoelastic properties and impair endothelial cell migration, providing a biophysical mechanism linking COL3A1 to vascular dysfunction.\",\n      \"evidence\": \"Cell-derived ECM reconstitution, AFM viscoelastic testing, proteomics, endothelial migration assay\",\n      \"pmids\": [\"37187299\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether altered viscoelasticity or specific ECM composition changes drive endothelial dysfunction is unresolved\", \"In vivo relevance of viscoelastic changes to vascular rupture not demonstrated\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the full-length procollagen trimer structure, the molecular basis of the collagen III–GPR56 binding interaction, the quantitative threshold of collagen III reduction sufficient for vascular rupture, and whether therapeutic supplementation with collagen III or chaperone-based approaches can rescue dominant-negative or haploinsufficient phenotypes.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No full-length type III procollagen trimer structure\", \"Collagen III–GPR56 binding interface not structurally resolved\", \"No established therapeutic rescue strategy for vEDS\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [0, 1, 7, 14, 20]},\n      {\"term_id\": \"GO:0098631\", \"supporting_discovery_ids\": [10, 11]},\n      {\"term_id\": \"GO:0048018\", \"supporting_discovery_ids\": [11, 18]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0031012\", \"supporting_discovery_ids\": [7, 10, 14, 20]},\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [5, 6, 10, 14]},\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [7, 13]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1474244\", \"supporting_discovery_ids\": [10, 14, 20]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [11, 18]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [0, 1, 9, 7]}\n    ],\n    \"complexes\": [\n      \"type III procollagen homotrimer\",\n      \"heterotypic type I/III collagen fibril\"\n    ],\n    \"partners\": [\n      \"GPR56\",\n      \"ITGA2\",\n      \"ITGB1\",\n      \"FN1\",\n      \"NKX2-5\",\n      \"FKBP22\",\n      \"ELAVL1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}