{"gene":"COCH","run_date":"2026-06-09T22:57:18","timeline":{"discoveries":[{"year":1997,"finding":"COCH (Coch-5B2) encodes a secreted protein with a predicted signal peptide and two regions of extensive homology to the collagen-binding type A (vWFA) domains of von Willebrand factor, indicating a structural role in the extracellular matrix. High-level expression is restricted to human fetal inner ear (cochlea and vestibule).","method":"cDNA cloning, sequence analysis, tissue expression panel by Northern blot/RT-PCR, FISH mapping","journal":"Genomics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — full-length cDNA characterization with domain identification and tissue localization, single lab, multiple methods","pmids":["9441737"],"is_preprint":false},{"year":1998,"finding":"Missense mutations in COCH (in the FCH/LCCL domain containing four conserved cysteines) cause autosomal dominant sensorineural hearing loss and vestibular dysfunction (DFNA9). COCH mRNA is expressed at high levels in fibrocytes of cochlear and vestibular neural regions, corresponding to areas showing histopathological acidophilic ground substance deposits in DFNA9 patients.","method":"Mutation analysis (sequencing), in situ hybridization of human and chicken inner ear sections","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct mutation identification replicated across three unrelated kindreds, in situ hybridization localizing expression to pathologically affected areas, subsequently replicated by many independent labs","pmids":["9806553"],"is_preprint":false},{"year":2001,"finding":"COCH mRNA and protein (cochlin) are expressed predominantly in fibrocytes of the spiral limbus and spiral ligament of the cochlea, and in fibrocytes of the connective tissue stroma of the crista ampullaris. These are exactly the cell types absent or markedly reduced in DFNA9 temporal bone sections, which show replacement by eosinophilic acellular material. Western blots of human fetal cochlear extracts show full-length cochlin and a smaller isoform. Immunohistochemistry with anti-cochlin antibody (raised against the N-terminal 135 aa FCH domain) confirms this localization.","method":"In situ hybridization, immunohistochemistry, western blot of human fetal cochlear extracts","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal mRNA and protein localization with multiple methods, directly linked to histopathological findings, replicated across mouse and human tissue","pmids":["11709536"],"is_preprint":false},{"year":2001,"finding":"The NMR structure of the LCCL domain of human cochlin (Coch-5b2) reveals a novel fold stabilized by disulfide bonds. Four of five known DFNA9 mutations (except Trp91Arg/W117R in human numbering) cause misfolding of the expressed domain when produced in bacteria, while the W117R mutant folds correctly but likely disrupts interaction with a binding partner, since it involves a solvent-exposed residue.","method":"NMR structure determination, bacterial expression of LCCL domain mutants, protein folding assessment","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — NMR structure with mutagenesis functional validation in a single rigorous study","pmids":["11574466"],"is_preprint":false},{"year":2001,"finding":"Cochlin constitutes ~70% of bovine inner ear proteins and exists as multiple isoforms (at least 16 protein spots by 2D gel electrophoresis), showing charge and size heterogeneity indicative of post-translational processing at both transcriptional and post-translational levels.","method":"2D gel electrophoresis, proteomic analysis of bovine inner ear","journal":"Biochimica et biophysica acta","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — proteomic characterization with 2D gels, single lab, demonstrates post-translational heterogeneity","pmids":["11278165"],"is_preprint":false},{"year":2003,"finding":"Cochlin is a secreted protein that passes through the endoplasmic reticulum and Golgi apparatus. It undergoes proteolytic cleavage between the FCH/LCCL domain and the vWFA domains, generating a ~50 kDa isoform lacking the entire LCCL domain (the mutation-bearing region). Cochlin is N-glycosylated in its mature secreted form. DFNA9 mutant cochlins are not retained intracellularly and are secreted adequately through the Golgi/ER pathway, also undergoing proteolytic cleavage and glycosylation, suggesting pathogenesis occurs after secretion in the extracellular matrix.","method":"Transient transfection of mammalian cell lines, western blot of lysates and media, immunocytochemistry, glycosylation assay","journal":"Journal of medical genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (secretion assay, immunocytochemistry, glycosylation, proteolytic cleavage) in one study, mechanistically defining cochlin's secretory pathway","pmids":["12843317"],"is_preprint":false},{"year":2003,"finding":"Wild-type cochlin accumulates in extracellular deposits that co-localize with fibronectin matrix, while DFNA9 LCCL-domain mutant cochlins show altered or absent extracellular matrix deposition patterns despite normal synthesis and secretion, suggesting DFNA9 pathology results from failure of cochlin to integrate correctly into the extracellular matrix, either by impaired self-assembly or failure to form appropriate complexes with other matrix components.","method":"Transient transfection, western blot, immunofluorescence of extracellular deposits in cell culture","journal":"Human genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — transfection system with immunofluorescence showing matrix deposition differences, single lab","pmids":["12928864"],"is_preprint":false},{"year":2004,"finding":"A novel short cochlin isoform (~16 kDa in human, 18-23 kDa in cow), termed Cochlin-tomoprotein (CTP), is detected specifically in perilymph but not in inner ear tissue. CTP corresponds to the N-terminus of full-length cochlin and contains the LCCL domain with all known DFNA9 mutation sites.","method":"Isoform-specific anti-cochlin antibodies, western blot of perilymph and inner ear tissue from human and bovine samples","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — western blot with isoform-specific antibodies, single lab, two species","pmids":["14733925"],"is_preprint":false},{"year":2005,"finding":"A COCH mutation (C542F) in the vWFA2 domain alters an evolutionarily conserved cysteine residue and disrupts intramolecular disulfide bond formation in cochlin, as shown by western blot under non-reducing versus reducing conditions. The C542F mutant cochlin is translated and secreted by transfected mammalian cells.","method":"Mammalian cell transfection, western blot under non-reducing and reducing conditions","journal":"American journal of medical genetics. Part A","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — biochemical demonstration of altered disulfide bonding, single lab","pmids":["16261627"],"is_preprint":false},{"year":2005,"finding":"Targeted disruption (knockout) of mouse Coch downstream of the LCCL domain results in no detectable cochlin in the inner ear. Homozygous Coch-/- mice have normal auditory brainstem responses, demonstrating that DFNA9 is not caused by haploinsufficiency but likely by a dominant-negative or gain-of-function mechanism of mutant cochlin. A Coch-LacZ reporter allele detected Coch mRNA expression in nonsensory epithelial and stromal regions of the cochlea and vestibular labyrinth.","method":"Targeted gene disruption (knockout mouse), auditory brainstem response (ABR), LacZ reporter","journal":"Human genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic loss-of-function with functional auditory phenotyping, replicated by subsequent studies showing Coch-/- mice eventually develop hearing loss only at advanced age","pmids":["16078052"],"is_preprint":false},{"year":2006,"finding":"Cochlin is the most abundant protein in mouse and human cochleae by proteomic analysis. Immunohistochemistry of DFNA9 temporal bone sections shows cochlin staining of the characteristic cochlear and vestibular deposits (eosinophilic acellular material), indicating cochlin aggregation in the same inner ear structures where it is normally expressed. High-level cochlin expression and protein stability persist even after severe atrophy of the fibrocytes that normally express COCH, demonstrating the stability of secreted cochlin in the extracellular matrix.","method":"Immunohistochemistry on DFNA9 temporal bone sections, proteomic analysis of mouse and human cochleae, comparison with Coch null (-/-) knockout mice","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (IHC, proteomics, mouse model comparison), directly establishing cochlin as the major component of inner ear deposits","pmids":["16481359"],"is_preprint":false},{"year":2008,"finding":"A G88E knock-in mouse model (Coch^G88E/G88E) develops progressive vestibular dysfunction (elevated VsEP thresholds) detectable as early as 11 months of age, followed by progressive hearing loss (elevated ABR thresholds) at 21 months, establishing that cochlin dysfunction causes age-related progressive vestibular and auditory deficits. Heterozygous Coch^G88E/+ mice also develop elevated ABR thresholds similar to homozygotes, consistent with dominant-negative mechanism.","method":"Gene targeting (knock-in mouse), VsEP, ABR, distortion product otoacoustic emissions","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — knock-in mouse model with multiple functional readouts (VsEP, ABR, DPOAE) at multiple ages","pmids":["18697796"],"is_preprint":false},{"year":2010,"finding":"Mutant cochlin (from DFNA9 mutations) forms a stable disulfide-bonded dimer, while wild-type cochlin forms dimers only transiently. The presence of mutant cochlin stabilizes wild-type cochlin in dimer conformation and eventually induces wild-type cochlin to form stable oligomers resistant to reducing agent. Mutant cochlin is cytotoxic both in vitro and in vivo.","method":"Western blot under reducing/non-reducing conditions, cell viability assays, in vivo cytotoxicity assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — biochemical demonstration of aberrant dimerization/oligomerization with reducing agent sensitivity assay, plus cytotoxicity assay, single lab","pmids":["20228067"],"is_preprint":false},{"year":2010,"finding":"Coch(-/-) null mice show elevated VsEP thresholds at 13 and 21 months of age, and elevated ABR thresholds at 21 months (with absent ABRs in 9 of 11 mice). Coch(-/+) heterozygous mice do not show hearing deficits, whereas Coch(G88E/+) heterozygotes show elevated ABR thresholds similar to homozygotes, confirming that DFNA9 dominant inheritance is not due to haploinsufficiency but to a dominant-negative or gain-of-function effect. Vestibular function is compromised before cochlear function in both mouse models.","method":"ABR, VsEP in Coch-/- and Coch^G88E/G88E mouse models at multiple ages","journal":"Hearing research","confidence":"High","confidence_rationale":"Tier 2 / Strong — two distinct mouse models (knockout and knock-in) compared with multiple functional readouts at multiple ages, genetic epistasis established","pmids":["21073934"],"is_preprint":false},{"year":2012,"finding":"A novel COCH mutation p.F527C in the vWFA2 domain causes cochlin to form covalent disulfide-bonded complexes retained in the endoplasmic reticulum/Golgi complex. Biochemical analysis of the recombinant vWFA2 domain carrying p.F527C shows increased propensity for disulfide-bonded dimerization and reduced structural stability, but unaffected collagen-binding affinity of the vWFA2 domain.","method":"Mammalian cell transfection, immunocytochemistry, western blot under reducing/non-reducing conditions, in vitro biochemical analysis of recombinant vWFA2 domain","journal":"Journal of molecular medicine (Berlin, Germany)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — combined cell biology and in vitro biochemistry with recombinant domain, single lab","pmids":["22610276"],"is_preprint":false},{"year":2014,"finding":"Functional analysis of eight COCH mutations reveals two distinct pathogenic mechanisms: (1) Two vWFA domain mutants are not transported from ER to Golgi and form high-molecular-weight aggregates in cell lysates; (2) Three LCCL domain mutants are detected as intracellular dimeric cochlins. Both classes result in abolishment of cochlin secretion. Genotype-phenotype analysis shows: LCCL domain mutations associate with accompanying vestibular dysfunction while vWFA domain mutations cause predominantly hearing loss; mutant cochlins that fail to be secreted correlate with earlier age of onset.","method":"Immunocytochemistry, western blot, tracking through secretory pathway in mammalian cell lines; comprehensive genotype-phenotype correlation","journal":"Human mutation","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (immunocytochemistry, western blot, secretion assay) across eight mutations with genotype-phenotype validation, single lab but comprehensive","pmids":["25230692"],"is_preprint":false},{"year":2015,"finding":"Cochlin is cleaved by aggrecanase-1 (ADAMTS-4) during inflammation, releasing the LCCL domain as a secreted fragment. DFNA9-linked mutations in cochlin (P51S, V66G, G88E, I109T, W117R, V123E, C162Y) all demonstrate significantly reduced susceptibility to aggrecanase cleavage (novel V123E mutant shows ~20.5% of wild-type cleavage efficiency), suggesting that impaired post-translational LCCL domain cleavage may contribute to DFNA9 pathogenesis.","method":"In vitro aggrecanase cleavage assay on wild-type and mutant cochlins expressed in mammalian cells","journal":"Human mutation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct enzymatic cleavage assay on multiple mutants, single lab, establishes aggrecanase-1 as a processing enzyme for cochlin","pmids":["26256111"],"is_preprint":false},{"year":2018,"finding":"Homozygous nonsense variants in COCH (c.292C>T, p.Arg98*) cause autosomal recessive prelingual deafness with early-onset vestibular dysfunction. Heterozygous carriers have normal hearing, establishing that biallelic loss-of-function of COCH is sufficient to cause hearing loss via a recessive mechanism distinct from the dominant-negative mechanism of DFNA9 missense mutations.","method":"Genetic analysis (sequencing), family co-segregation study, audiological and vestibular phenotyping","journal":"European journal of human genetics : EJHG","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic and phenotypic evidence in a human family establishing recessive loss-of-function as a distinct mechanism, single report","pmids":["29449721"],"is_preprint":false},{"year":2020,"finding":"Novel COCH loss-of-function variants (two nonsense, one missense, one in-frame deletion) cause autosomal recessive nonsyndromic hearing loss. Minigene splicing assays demonstrate that the missense and in-frame deletion variants alter RNA splicing by creating an exon splicing silencer and abolishing an exon splicing enhancer, respectively, leading to frameshifts and predicted null alleles.","method":"Targeted gene panels, exome sequencing, minigene splicing assay","journal":"Human genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional minigene assays demonstrate splicing mechanism, single lab","pmids":["32562050"],"is_preprint":false},{"year":2020,"finding":"A homozygous frameshift COCH variant in a human family results in major decrease in cochlin translation and loss-of-function, as demonstrated using COS7 cell lines, providing the first direct evidence of DFNB110 (recessive) cochlin loss-of-function at the protein level.","method":"COS7 cell line expression studies, western blot analysis of cochlin translation","journal":"European journal of human genetics : EJHG","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — cell-based functional assay demonstrating loss of cochlin protein, single lab","pmids":["32939038"],"is_preprint":false},{"year":2022,"finding":"Cochlin binds selectively to highly sulfated glycosaminoglycans (GAGs), specifically heparin, via N-sulfation-dependent interaction (N-desulfation abolishes binding; 2-O- and 6-O-desulfation do not). All DFNA9 point mutations diminish cochlin binding to GAGs. Mouse cochlea contains moderately sulfated GAGs that cochlin (as cochlin/Fc fusion) binds, suggesting cochlin-GAG interaction is relevant to cochlear extracellular matrix function.","method":"Cochlin reporter cell β-galactosidase assay, GAG binding assay with desulfation controls, immunostaining of mouse cochlea with cochlin/Fc fusion protein, GAG composition analysis","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct binding assay with multiple desulfation controls and mutant panel, single lab","pmids":["35901072"],"is_preprint":false},{"year":2021,"finding":"COCH-expressing neurons in the distal ventral CA3 hippocampus co-express Mtf1 and Cacna1h. MTF1 activates Cacna1h transcription in these neurons, enabling burst action potentials. COCH neurons synapse directly with GABAergic inhibitory neurons in the lateral septum and mediate social-stress-induced anxiety-like behavior.","method":"Genetic targeting of COCH-expressing neurons, transcriptome analysis, electrophysiology, circuit tracing, behavioral assays","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic targeting with circuit tracing and behavioral readouts, single lab, establishes COCH neuron circuit function","pmids":["34965426"],"is_preprint":false},{"year":2024,"finding":"Loss of Cochlin (Cochlin-/- mice) causes progressive alterations in collagen fibril organization in flexor tendons by 3 months of age and significant declines in tendon structural and material mechanical properties by 6 months. The Cochlin-/- tendon proteome shows consistent decreases in proteins associated with RNA metabolism, extracellular matrix production, and cytoskeleton, establishing Cochlin as a critical extracellular matrix protein for tendon homeostasis.","method":"Cochlin-/- knockout mouse model, collagen fibril imaging, biomechanical testing, quantitative proteomics","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — knockout mouse with multiple functional readouts (histology, biomechanics, proteomics), preprint","pmids":[],"is_preprint":true},{"year":2025,"finding":"Cochlin, expressed in brain barrier tissues including the pineal gland, area postrema, choroid plexus and meninges of zebrafish, mice and humans, contributes to brain defense against bacterial infection. Cochlin expression transiently increases upon Mycobacterium marinum infection in zebrafish larvae; delivery of recombinant cochlin reduces bacterial load; cochlin mutation inhibits bacterial clearance from the brain; and supplying the LCCL domain reverses this deficit, establishing the cleaved LCCL domain as the active antibacterial moiety.","method":"Transcriptome analysis, in situ hybridization, recombinant cochlin delivery, cochlin mutant zebrafish, LCCL domain rescue experiment","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple methods including loss-of-function and rescue with defined domain in zebrafish model, preprint","pmids":[],"is_preprint":true}],"current_model":"Cochlin (encoded by COCH) is a secreted extracellular matrix glycoprotein, abundantly expressed in inner ear fibrocytes, whose N-terminal LCCL domain (with a novel NMR-solved fold) undergoes proteolytic cleavage by aggrecanase-1, self-assembles into matrix deposits alongside fibronectin, and binds sulfated heparan sulfate/heparin in a N-sulfation-dependent manner; DFNA9-causing missense mutations in the LCCL domain cause protein misfolding and aberrant disulfide-bonded dimerization/aggregation that can block secretion and matrix integration or disrupt cleavage and GAG binding (dominant-negative/gain-of-function), while biallelic truncating variants cause recessive hearing loss through loss-of-function; in the brain, the cleaved LCCL domain acts as an innate immune effector at barrier tissues, and in the hippocampus COCH-expressing CA3 neurons drive social-stress-induced anxiety via MTF1-regulated Cacna1h burst firing onto lateral septal GABAergic neurons."},"narrative":{"mechanistic_narrative":"COCH encodes cochlin, a secreted extracellular matrix glycoprotein built from an N-terminal LCCL (FCH) domain and two collagen-binding type A (vWFA) domains, expressed at high levels in fibrocytes of the cochlear spiral limbus and ligament and the vestibular crista ampullaris [PMID:9441737, PMID:9806553, PMID:11709536]. Cochlin is among the most abundant proteins of the inner ear [PMID:16481359], transits the ER/Golgi secretory pathway, is N-glycosylated, and is proteolytically cleaved between the LCCL and vWFA domains — a cleavage mediated by aggrecanase-1 (ADAMTS-4) during inflammation that releases the LCCL domain as a soluble fragment [PMID:12843317, PMID:26256111]. Secreted cochlin self-assembles into extracellular deposits that co-localize with fibronectin and binds selectively to highly N-sulfated glycosaminoglycans such as heparin [PMID:12928864, PMID:35901072]; loss of cochlin disrupts collagen fibril organization and tendon mechanical properties, underscoring a structural ECM role beyond the ear. Dominant missense mutations in the LCCL and vWFA domains cause DFNA9 sensorineural hearing loss and vestibular dysfunction through a dominant-negative/gain-of-function mechanism: the NMR-defined LCCL fold misfolds, mutant cochlin forms aberrant stable disulfide-bonded dimers and cytotoxic oligomers, and these mutants show impaired ECM integration, reduced aggrecanase cleavage, and diminished GAG binding [PMID:9806553, PMID:11574466, PMID:20228067, PMID:25230692, PMID:26256111, PMID:35901072]; knockout mice retain normal early hearing, excluding haploinsufficiency, while G88E knock-in mice phenocopy the dominant disease [PMID:16078052, PMID:18697796, PMID:21073934]. In contrast, biallelic truncating/loss-of-function variants cause recessive nonsyndromic hearing loss (DFNB110) through loss of cochlin protein [PMID:29449721, PMID:32939038]. The cleaved LCCL domain additionally functions as an innate antibacterial effector at brain barrier tissues, and a distinct population of COCH-expressing CA3 hippocampal neurons drives social-stress-induced anxiety via MTF1-activated Cacna1h burst firing onto lateral septal GABAergic neurons [PMID:34965426].","teleology":[{"year":1997,"claim":"Established cochlin as a candidate secreted ECM protein with collagen-binding vWFA domains and inner-ear-restricted expression, defining the molecular starting point.","evidence":"cDNA cloning, domain/sequence analysis, and tissue expression panel","pmids":["9441737"],"confidence":"Medium","gaps":["No direct demonstration of secretion or matrix function","LCCL domain function not yet defined"]},{"year":1998,"claim":"Linked COCH missense mutations in the LCCL domain to dominant DFNA9 hearing loss and vestibular dysfunction, tying the gene to a defined Mendelian phenotype and to pathological ground-substance deposits.","evidence":"Mutation sequencing across kindreds and in situ hybridization of inner ear sections","pmids":["9806553"],"confidence":"High","gaps":["Mechanism connecting mutation to deposits unresolved","Dominant vs loss-of-function basis unknown"]},{"year":2001,"claim":"Resolved the LCCL domain fold and showed most DFNA9 mutations destabilize it, providing structural rationale for pathogenicity.","evidence":"NMR structure with bacterial expression and folding assessment of mutant domains","pmids":["11574466"],"confidence":"High","gaps":["Folding tested only for isolated bacterial domain, not full-length glycosylated protein","Binding partner blocked by W117R not identified"]},{"year":2001,"claim":"Localized cochlin protein and mRNA to the fibrocytes lost in DFNA9 temporal bones and detected processed isoforms, connecting expression to disease histopathology.","evidence":"In situ hybridization, immunohistochemistry, western blot of fetal cochlear extracts; 2D proteomics of bovine inner ear","pmids":["11709536","11278165"],"confidence":"High","gaps":["Identity and origin of smaller isoforms not yet defined","Processing enzymes unknown"]},{"year":2003,"claim":"Defined cochlin's secretory route, N-glycosylation, and proteolytic separation of the LCCL from vWFA domains, and showed mutants are still secreted — shifting pathogenesis to the extracellular space.","evidence":"Transfection with secretion/glycosylation assays, immunocytochemistry, plus matrix deposition immunofluorescence","pmids":["12843317","12928864"],"confidence":"High","gaps":["Protease responsible for cleavage not identified","Self-assembly vs partner-complex basis of deposition unresolved"]},{"year":2004,"claim":"Identified the perilymph-specific LCCL-containing CTP fragment, establishing that the mutation-bearing domain is liberated as a distinct circulating isoform.","evidence":"Isoform-specific antibody western blots of perilymph vs tissue in human and bovine samples","pmids":["14733925"],"confidence":"Medium","gaps":["Functional role of CTP not addressed","Single-lab antibody-based detection"]},{"year":2005,"claim":"Genetic knockout established that DFNA9 is not haploinsufficiency, pointing to a dominant-negative/gain-of-function disease mechanism.","evidence":"Coch knockout mouse with ABR phenotyping and LacZ reporter expression mapping","pmids":["16078052"],"confidence":"High","gaps":["Molecular nature of dominant-negative effect not shown","Late-onset null phenotype not yet characterized"]},{"year":2006,"claim":"Confirmed cochlin as the principal protein of the DFNA9 inner ear deposits and demonstrated its extracellular stability, linking aggregation to disease morphology.","evidence":"Proteomics and immunohistochemistry on temporal bones with knockout comparison","pmids":["16481359"],"confidence":"High","gaps":["Biochemical trigger of in vivo aggregation not defined"]},{"year":2008,"claim":"A G88E knock-in showed dominant heterozygous progressive vestibular-then-auditory decline, modeling DFNA9 and confirming the dominant-negative mechanism in vivo.","evidence":"Knock-in mouse with VsEP, ABR, DPOAE across ages","pmids":["18697796"],"confidence":"High","gaps":["Molecular basis of vestibular-before-cochlear sequence unexplained"]},{"year":2010,"claim":"Demonstrated the biochemical mechanism of dominant negativity: mutant cochlin forms stable disulfide dimers, recruits wild-type protein into reducing-resistant cytotoxic oligomers, and is toxic in vivo.","evidence":"Non-reducing/reducing western blots, cytotoxicity assays in vitro and in vivo; combined with paired knockout/knock-in ABR-VsEP epistasis","pmids":["20228067","21073934"],"confidence":"Medium","gaps":["Aggregation pathway and cytotoxic species not structurally defined","Single-lab biochemistry"]},{"year":2012,"claim":"Showed vWFA2-domain mutations (F527C) can drive aberrant disulfide-bonded complexes retained in the ER/Golgi while sparing collagen binding, extending pathogenic mechanisms beyond the LCCL domain.","evidence":"Transfection, reducing/non-reducing western blot, recombinant vWFA2 biochemistry","pmids":["22610276"],"confidence":"Medium","gaps":["In vivo consequences of ER retention not tested","Single-lab"]},{"year":2014,"claim":"Resolved two mechanistic classes of DFNA9 mutation — vWFA aggregation/ER-block vs LCCL intracellular dimers — both abolishing secretion, and correlated them with genotype-phenotype and onset.","evidence":"Secretory-pathway tracking across eight mutations with clinical correlation","pmids":["25230692"],"confidence":"High","gaps":["Why domain location dictates vestibular vs auditory bias not mechanistically explained"]},{"year":2015,"claim":"Identified aggrecanase-1 (ADAMTS-4) as the protease that cleaves cochlin and releases the LCCL domain during inflammation, and showed DFNA9 mutations impair this cleavage.","evidence":"In vitro aggrecanase cleavage assays on wild-type and mutant cochlins","pmids":["26256111"],"confidence":"Medium","gaps":["In vivo relevance of impaired cleavage to deposits not demonstrated","Single-lab"]},{"year":2018,"claim":"Established a distinct recessive disease mechanism: biallelic truncating COCH variants cause prelingual deafness via loss-of-function, separating DFNB110 from dominant DFNA9.","evidence":"Sequencing and family co-segregation with audiovestibular phenotyping","pmids":["29449721"],"confidence":"Medium","gaps":["Protein-level confirmation absent in this report"]},{"year":2020,"claim":"Extended and validated the recessive loss-of-function mechanism, showing splicing-disrupting and frameshift variants yield null alleles and loss of cochlin protein.","evidence":"Minigene splicing assays and COS7 expression/western blot","pmids":["32562050","32939038"],"confidence":"Medium","gaps":["No tissue-level confirmation of protein loss in patients","Single-lab assays"]},{"year":2022,"claim":"Identified cochlin's selective N-sulfation-dependent binding to heparin/highly sulfated GAGs and showed all DFNA9 mutations diminish this binding, defining a matrix-anchoring activity disrupted in disease.","evidence":"Reporter-cell GAG binding assays with desulfation controls, cochlin/Fc cochlear immunostaining, GAG composition analysis","pmids":["35901072"],"confidence":"Medium","gaps":["Which domain mediates GAG binding not localized","Physiological consequence of disrupted binding not tested in vivo"]},{"year":2021,"claim":"Revealed an unexpected neuronal role: COCH marks a CA3 hippocampal population that uses MTF1-driven Cacna1h burst firing onto lateral septal GABAergic neurons to mediate social-stress anxiety.","evidence":"Genetic targeting, transcriptomics, electrophysiology, circuit tracing, behavior in mice","pmids":["34965426"],"confidence":"Medium","gaps":["Whether secreted cochlin protein contributes to this circuit, vs COCH as a marker, is unclear","Single-lab"]},{"year":2024,"claim":"Showed cochlin is required for tendon collagen fibril organization and mechanics, generalizing its structural ECM role beyond the inner ear.","evidence":"Cochlin knockout mouse with fibril imaging, biomechanics, and proteomics (preprint)","pmids":[],"confidence":"Medium","gaps":["Preprint, not peer-reviewed","Molecular interactions in tendon matrix not defined"]},{"year":2025,"claim":"Assigned an innate-immune effector function to the cleaved LCCL domain at brain barrier tissues, with loss-of-function and domain-rescue establishing it as the antibacterial moiety.","evidence":"Transcriptomics, in situ hybridization, recombinant cochlin/LCCL delivery and mutant rescue in zebrafish (preprint)","pmids":[],"confidence":"Medium","gaps":["Preprint, not peer-reviewed","Mechanism of bacterial clearance unknown","Mammalian relevance not established"]},{"year":null,"claim":"How cochlin's normal matrix-organizing, GAG-binding, and antibacterial functions integrate, and the structural identity of the cytotoxic mutant aggregate species in DFNA9, remain unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structure of the full-length protein or its oligomeric deposits","Endogenous binding partner blocked by W117R never identified","Relationship between ear ECM role and neuronal/immune roles unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[0]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[6,22]},{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[20]}],"localization":[{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[5,6,7]},{"term_id":"GO:0031012","term_label":"extracellular matrix","supporting_discovery_ids":[6,10,22]},{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[5,14]},{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[5,14]}],"pathway":[{"term_id":"R-HSA-1474244","term_label":"Extracellular matrix organization","supporting_discovery_ids":[6,22]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[1,15,17]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[23]}],"complexes":[],"partners":["FN1","ADAMTS4","MTF1","CACNA1H"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"O43405","full_name":"Cochlin","aliases":["COCH-5B2"],"length_aa":550,"mass_kda":59.5,"function":"Plays a role in the control of cell shape and motility in the trabecular meshwork","subcellular_location":"Secreted, extracellular space, extracellular matrix","url":"https://www.uniprot.org/uniprotkb/O43405/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/COCH","classification":"Not 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a progressive cochlear-vestibular dysfunction with onset in middle-age (DFNA9)].","date":"2005","source":"Nederlands tijdschrift voor geneeskunde","url":"https://pubmed.ncbi.nlm.nih.gov/16355574","citation_count":6,"is_preprint":false},{"pmid":"28099493","id":"PMC_28099493","title":"Different Phenotypes of the Two Chinese Probands with the Same c.889G>A (p.C162Y) Mutation in COCH Gene Verify Different Mechanisms Underlying Autosomal Dominant Nonsyndromic Deafness 9.","date":"2017","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/28099493","citation_count":6,"is_preprint":false},{"pmid":"24063017","id":"PMC_24063017","title":"Analysis of COCH and TNFA variants in East Indian primary open-angle glaucoma patients.","date":"2013","source":"BioMed research international","url":"https://pubmed.ncbi.nlm.nih.gov/24063017","citation_count":5,"is_preprint":false},{"pmid":"38218018","id":"PMC_38218018","title":"Rational design of a genomically humanized mouse model for dominantly inherited hearing loss, DFNA9.","date":"2023","source":"Hearing research","url":"https://pubmed.ncbi.nlm.nih.gov/38218018","citation_count":4,"is_preprint":false},{"pmid":"38167558","id":"PMC_38167558","title":"Interaural and sex differences in the natural evolution of hearing levels in pre-symptomatic and symptomatic carriers of the p.Pro51Ser variant in the COCH gene.","date":"2024","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/38167558","citation_count":3,"is_preprint":false},{"pmid":"35901072","id":"PMC_35901072","title":"Involvement of cochlin binding to sulfated heparan sulfate/heparin in the pathophysiology of autosomal dominant late-onset hearing loss (DFNA9).","date":"2022","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/35901072","citation_count":3,"is_preprint":false},{"pmid":"28116169","id":"PMC_28116169","title":"Massively Parallel Sequencing of a Chinese Family with DFNA9 Identified a Novel Missense Mutation in the LCCL Domain of COCH.","date":"2016","source":"Neural plasticity","url":"https://pubmed.ncbi.nlm.nih.gov/28116169","citation_count":3,"is_preprint":false},{"pmid":"41046611","id":"PMC_41046611","title":"Self-supported Fe,Mn-CoCH/NF electrocatalyst for oxygen evolution reaction.","date":"2025","source":"Journal of colloid and interface science","url":"https://pubmed.ncbi.nlm.nih.gov/41046611","citation_count":3,"is_preprint":false},{"pmid":"33710989","id":"PMC_33710989","title":"A Novel COCH Mutation Affects the vWFA2 Domain and Leads to a Relatively Mild DFNA9 Phenotype.","date":"2021","source":"Otology & neurotology : official publication of the American Otological Society, American Neurotology Society [and] European Academy of Otology and Neurotology","url":"https://pubmed.ncbi.nlm.nih.gov/33710989","citation_count":2,"is_preprint":false},{"pmid":"40088601","id":"PMC_40088601","title":"Cochlear health in a cohort of cochlear implant users carrying the p.Pro51Ser variant in the COCH gene (DFNA9): A cross-sectional study evaluating the changes in the electrically evoked compound action potential (eCAP).","date":"2025","source":"Hearing research","url":"https://pubmed.ncbi.nlm.nih.gov/40088601","citation_count":2,"is_preprint":false},{"pmid":"37709329","id":"PMC_37709329","title":"Evaluation of hearing levels and vestibular function and the impact on cognitive performance in (pre)-symptomatic patients with DFNA9: protocol for a prospective longitudinal study (Rosetta study).","date":"2023","source":"BMJ open","url":"https://pubmed.ncbi.nlm.nih.gov/37709329","citation_count":2,"is_preprint":false},{"pmid":"15729138","id":"PMC_15729138","title":"RT-PCR analysis of Tecta, Coch, Eya4 and Strc in mouse cochlear explants.","date":"2005","source":"Neuroreport","url":"https://pubmed.ncbi.nlm.nih.gov/15729138","citation_count":2,"is_preprint":false},{"pmid":"29765451","id":"PMC_29765451","title":"Sequencing of exons 4, 5, 12 of COCH gene in patients with postlingual sensorineural hearing loss accompanied by vestibular lesion.","date":"2016","source":"Archives of medical science : AMS","url":"https://pubmed.ncbi.nlm.nih.gov/29765451","citation_count":2,"is_preprint":false},{"pmid":"31493294","id":"PMC_31493294","title":"First Report of Bilateral External Auditory Canal Cochlin Aggregates (\"Cochlinomas\") with Multifocal Amyloid-Like Deposits, Associated with Sensorineural Hearing Loss and a Novel Genetic Variant in COCH Encoding Cochlin.","date":"2019","source":"Head and neck pathology","url":"https://pubmed.ncbi.nlm.nih.gov/31493294","citation_count":2,"is_preprint":false},{"pmid":"35020687","id":"PMC_35020687","title":"Does Vestibulo-Ocular Reflex (VOR) Gain Correlate With Radiological Findings in the Semi-Circular Canals in Patients Carrying the p.Pro51Ser (P51S) COCH Variant Causing DFNA9? Relationship Between the Three-Dimensional Video Head Impulse Test (vHIT) and MR/CT Imaging.","date":"2022","source":"Otology & neurotology : official publication of the American Otological Society, American Neurotology Society [and] European Academy of Otology and Neurotology","url":"https://pubmed.ncbi.nlm.nih.gov/35020687","citation_count":1,"is_preprint":false},{"pmid":"20629486","id":"PMC_20629486","title":"Molecular cloning of the Coch gene of guinea pig inner ear and its expression analysis in cultured fibrocytes of the spiral ligament.","date":"2010","source":"Acta oto-laryngologica","url":"https://pubmed.ncbi.nlm.nih.gov/20629486","citation_count":1,"is_preprint":false},{"pmid":"18269866","id":"PMC_18269866","title":"[Mutation screening of the COCH gene in familial and sporadic patients with late onset nonsyndromic sensorineural hearing loss among Chinese population].","date":"2007","source":"Zhonghua yi xue za zhi","url":"https://pubmed.ncbi.nlm.nih.gov/18269866","citation_count":1,"is_preprint":false},{"pmid":"41907502","id":"PMC_41907502","title":"Nonequilibrium Synthesis of Glycolamide (NH2COCH2OH), a Precursor to Amino Acids, on Interstellar Nanoparticles.","date":"2025","source":"ACS central science","url":"https://pubmed.ncbi.nlm.nih.gov/41907502","citation_count":1,"is_preprint":false},{"pmid":"33492061","id":"PMC_33492061","title":"Predictive Sensitivity and Concordance of Machine-learning Tools for Diagnosing DFNA9 in a Large Series of p.Pro51Ser Variant Carriers in the COCH-gene.","date":"2021","source":"Otology & neurotology : official publication of the American Otological Society, American Neurotology Society [and] European Academy of Otology and Neurotology","url":"https://pubmed.ncbi.nlm.nih.gov/33492061","citation_count":0,"is_preprint":false},{"pmid":"39666779","id":"PMC_39666779","title":"Hearing and Vestibular Impairment Related to a Variant (c.263G>C) of the COCH Gene.","date":"2024","source":"Otolaryngology--head and neck surgery : official journal of American Academy of Otolaryngology-Head and Neck Surgery","url":"https://pubmed.ncbi.nlm.nih.gov/39666779","citation_count":0,"is_preprint":false},{"pmid":"39864432","id":"PMC_39864432","title":"Early Deficits in Speech Perception in Carriers of the p.Pro51Ser Variant in the <italic>COCH</italic> Gene: A Prospective Longitudinal Evaluation of Speech Perception in Quiet and Noise.","date":"2025","source":"Audiology & neuro-otology","url":"https://pubmed.ncbi.nlm.nih.gov/39864432","citation_count":0,"is_preprint":false},{"pmid":"42259506","id":"PMC_42259506","title":"Performance Results and Timing of Cochlear Implantation in Patients With DFNA9 (p.Pro51Ser).","date":"2026","source":"Otology & neurotology : official publication of the American Otological Society, American Neurotology Society [and] European Academy of Otology and Neurotology","url":"https://pubmed.ncbi.nlm.nih.gov/42259506","citation_count":0,"is_preprint":false},{"pmid":"26351166","id":"PMC_26351166","title":"[Phenotype predictions of the pathogenic nonsynonymous single nucleotide polymorphisms in deafness-causing gene COCH].","date":"2015","source":"Yi chuan = Hereditas","url":"https://pubmed.ncbi.nlm.nih.gov/26351166","citation_count":0,"is_preprint":false},{"pmid":"23590105","id":"PMC_23590105","title":"[Genotype--phenotype correlation limits in sensorineural hearing loss: case report of a three-year-old child with a bilateral cochleovestibular impairment and a molecular variant of the COCH gene].","date":"2012","source":"Revue de laryngologie - otologie - rhinologie","url":"https://pubmed.ncbi.nlm.nih.gov/23590105","citation_count":0,"is_preprint":false},{"pmid":"41528991","id":"PMC_41528991","title":"Catalysis of Acetone Enolization by Nitrogen-Containing Ligands: An Infrared Spectroscopic Study of (CH3COCH3-X)+ Complexes (X = CH3CN, CH2CHCN, NH3).","date":"2026","source":"The journal of physical chemistry. 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High-level expression is restricted to human fetal inner ear (cochlea and vestibule).\",\n      \"method\": \"cDNA cloning, sequence analysis, tissue expression panel by Northern blot/RT-PCR, FISH mapping\",\n      \"journal\": \"Genomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — full-length cDNA characterization with domain identification and tissue localization, single lab, multiple methods\",\n      \"pmids\": [\"9441737\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Missense mutations in COCH (in the FCH/LCCL domain containing four conserved cysteines) cause autosomal dominant sensorineural hearing loss and vestibular dysfunction (DFNA9). COCH mRNA is expressed at high levels in fibrocytes of cochlear and vestibular neural regions, corresponding to areas showing histopathological acidophilic ground substance deposits in DFNA9 patients.\",\n      \"method\": \"Mutation analysis (sequencing), in situ hybridization of human and chicken inner ear sections\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct mutation identification replicated across three unrelated kindreds, in situ hybridization localizing expression to pathologically affected areas, subsequently replicated by many independent labs\",\n      \"pmids\": [\"9806553\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"COCH mRNA and protein (cochlin) are expressed predominantly in fibrocytes of the spiral limbus and spiral ligament of the cochlea, and in fibrocytes of the connective tissue stroma of the crista ampullaris. These are exactly the cell types absent or markedly reduced in DFNA9 temporal bone sections, which show replacement by eosinophilic acellular material. Western blots of human fetal cochlear extracts show full-length cochlin and a smaller isoform. Immunohistochemistry with anti-cochlin antibody (raised against the N-terminal 135 aa FCH domain) confirms this localization.\",\n      \"method\": \"In situ hybridization, immunohistochemistry, western blot of human fetal cochlear extracts\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal mRNA and protein localization with multiple methods, directly linked to histopathological findings, replicated across mouse and human tissue\",\n      \"pmids\": [\"11709536\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"The NMR structure of the LCCL domain of human cochlin (Coch-5b2) reveals a novel fold stabilized by disulfide bonds. Four of five known DFNA9 mutations (except Trp91Arg/W117R in human numbering) cause misfolding of the expressed domain when produced in bacteria, while the W117R mutant folds correctly but likely disrupts interaction with a binding partner, since it involves a solvent-exposed residue.\",\n      \"method\": \"NMR structure determination, bacterial expression of LCCL domain mutants, protein folding assessment\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — NMR structure with mutagenesis functional validation in a single rigorous study\",\n      \"pmids\": [\"11574466\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Cochlin constitutes ~70% of bovine inner ear proteins and exists as multiple isoforms (at least 16 protein spots by 2D gel electrophoresis), showing charge and size heterogeneity indicative of post-translational processing at both transcriptional and post-translational levels.\",\n      \"method\": \"2D gel electrophoresis, proteomic analysis of bovine inner ear\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — proteomic characterization with 2D gels, single lab, demonstrates post-translational heterogeneity\",\n      \"pmids\": [\"11278165\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Cochlin is a secreted protein that passes through the endoplasmic reticulum and Golgi apparatus. It undergoes proteolytic cleavage between the FCH/LCCL domain and the vWFA domains, generating a ~50 kDa isoform lacking the entire LCCL domain (the mutation-bearing region). Cochlin is N-glycosylated in its mature secreted form. DFNA9 mutant cochlins are not retained intracellularly and are secreted adequately through the Golgi/ER pathway, also undergoing proteolytic cleavage and glycosylation, suggesting pathogenesis occurs after secretion in the extracellular matrix.\",\n      \"method\": \"Transient transfection of mammalian cell lines, western blot of lysates and media, immunocytochemistry, glycosylation assay\",\n      \"journal\": \"Journal of medical genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (secretion assay, immunocytochemistry, glycosylation, proteolytic cleavage) in one study, mechanistically defining cochlin's secretory pathway\",\n      \"pmids\": [\"12843317\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Wild-type cochlin accumulates in extracellular deposits that co-localize with fibronectin matrix, while DFNA9 LCCL-domain mutant cochlins show altered or absent extracellular matrix deposition patterns despite normal synthesis and secretion, suggesting DFNA9 pathology results from failure of cochlin to integrate correctly into the extracellular matrix, either by impaired self-assembly or failure to form appropriate complexes with other matrix components.\",\n      \"method\": \"Transient transfection, western blot, immunofluorescence of extracellular deposits in cell culture\",\n      \"journal\": \"Human genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — transfection system with immunofluorescence showing matrix deposition differences, single lab\",\n      \"pmids\": [\"12928864\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"A novel short cochlin isoform (~16 kDa in human, 18-23 kDa in cow), termed Cochlin-tomoprotein (CTP), is detected specifically in perilymph but not in inner ear tissue. CTP corresponds to the N-terminus of full-length cochlin and contains the LCCL domain with all known DFNA9 mutation sites.\",\n      \"method\": \"Isoform-specific anti-cochlin antibodies, western blot of perilymph and inner ear tissue from human and bovine samples\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — western blot with isoform-specific antibodies, single lab, two species\",\n      \"pmids\": [\"14733925\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"A COCH mutation (C542F) in the vWFA2 domain alters an evolutionarily conserved cysteine residue and disrupts intramolecular disulfide bond formation in cochlin, as shown by western blot under non-reducing versus reducing conditions. The C542F mutant cochlin is translated and secreted by transfected mammalian cells.\",\n      \"method\": \"Mammalian cell transfection, western blot under non-reducing and reducing conditions\",\n      \"journal\": \"American journal of medical genetics. Part A\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — biochemical demonstration of altered disulfide bonding, single lab\",\n      \"pmids\": [\"16261627\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Targeted disruption (knockout) of mouse Coch downstream of the LCCL domain results in no detectable cochlin in the inner ear. Homozygous Coch-/- mice have normal auditory brainstem responses, demonstrating that DFNA9 is not caused by haploinsufficiency but likely by a dominant-negative or gain-of-function mechanism of mutant cochlin. A Coch-LacZ reporter allele detected Coch mRNA expression in nonsensory epithelial and stromal regions of the cochlea and vestibular labyrinth.\",\n      \"method\": \"Targeted gene disruption (knockout mouse), auditory brainstem response (ABR), LacZ reporter\",\n      \"journal\": \"Human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic loss-of-function with functional auditory phenotyping, replicated by subsequent studies showing Coch-/- mice eventually develop hearing loss only at advanced age\",\n      \"pmids\": [\"16078052\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Cochlin is the most abundant protein in mouse and human cochleae by proteomic analysis. Immunohistochemistry of DFNA9 temporal bone sections shows cochlin staining of the characteristic cochlear and vestibular deposits (eosinophilic acellular material), indicating cochlin aggregation in the same inner ear structures where it is normally expressed. High-level cochlin expression and protein stability persist even after severe atrophy of the fibrocytes that normally express COCH, demonstrating the stability of secreted cochlin in the extracellular matrix.\",\n      \"method\": \"Immunohistochemistry on DFNA9 temporal bone sections, proteomic analysis of mouse and human cochleae, comparison with Coch null (-/-) knockout mice\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (IHC, proteomics, mouse model comparison), directly establishing cochlin as the major component of inner ear deposits\",\n      \"pmids\": [\"16481359\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"A G88E knock-in mouse model (Coch^G88E/G88E) develops progressive vestibular dysfunction (elevated VsEP thresholds) detectable as early as 11 months of age, followed by progressive hearing loss (elevated ABR thresholds) at 21 months, establishing that cochlin dysfunction causes age-related progressive vestibular and auditory deficits. Heterozygous Coch^G88E/+ mice also develop elevated ABR thresholds similar to homozygotes, consistent with dominant-negative mechanism.\",\n      \"method\": \"Gene targeting (knock-in mouse), VsEP, ABR, distortion product otoacoustic emissions\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — knock-in mouse model with multiple functional readouts (VsEP, ABR, DPOAE) at multiple ages\",\n      \"pmids\": [\"18697796\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Mutant cochlin (from DFNA9 mutations) forms a stable disulfide-bonded dimer, while wild-type cochlin forms dimers only transiently. The presence of mutant cochlin stabilizes wild-type cochlin in dimer conformation and eventually induces wild-type cochlin to form stable oligomers resistant to reducing agent. Mutant cochlin is cytotoxic both in vitro and in vivo.\",\n      \"method\": \"Western blot under reducing/non-reducing conditions, cell viability assays, in vivo cytotoxicity assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — biochemical demonstration of aberrant dimerization/oligomerization with reducing agent sensitivity assay, plus cytotoxicity assay, single lab\",\n      \"pmids\": [\"20228067\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Coch(-/-) null mice show elevated VsEP thresholds at 13 and 21 months of age, and elevated ABR thresholds at 21 months (with absent ABRs in 9 of 11 mice). Coch(-/+) heterozygous mice do not show hearing deficits, whereas Coch(G88E/+) heterozygotes show elevated ABR thresholds similar to homozygotes, confirming that DFNA9 dominant inheritance is not due to haploinsufficiency but to a dominant-negative or gain-of-function effect. Vestibular function is compromised before cochlear function in both mouse models.\",\n      \"method\": \"ABR, VsEP in Coch-/- and Coch^G88E/G88E mouse models at multiple ages\",\n      \"journal\": \"Hearing research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — two distinct mouse models (knockout and knock-in) compared with multiple functional readouts at multiple ages, genetic epistasis established\",\n      \"pmids\": [\"21073934\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"A novel COCH mutation p.F527C in the vWFA2 domain causes cochlin to form covalent disulfide-bonded complexes retained in the endoplasmic reticulum/Golgi complex. Biochemical analysis of the recombinant vWFA2 domain carrying p.F527C shows increased propensity for disulfide-bonded dimerization and reduced structural stability, but unaffected collagen-binding affinity of the vWFA2 domain.\",\n      \"method\": \"Mammalian cell transfection, immunocytochemistry, western blot under reducing/non-reducing conditions, in vitro biochemical analysis of recombinant vWFA2 domain\",\n      \"journal\": \"Journal of molecular medicine (Berlin, Germany)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — combined cell biology and in vitro biochemistry with recombinant domain, single lab\",\n      \"pmids\": [\"22610276\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Functional analysis of eight COCH mutations reveals two distinct pathogenic mechanisms: (1) Two vWFA domain mutants are not transported from ER to Golgi and form high-molecular-weight aggregates in cell lysates; (2) Three LCCL domain mutants are detected as intracellular dimeric cochlins. Both classes result in abolishment of cochlin secretion. Genotype-phenotype analysis shows: LCCL domain mutations associate with accompanying vestibular dysfunction while vWFA domain mutations cause predominantly hearing loss; mutant cochlins that fail to be secreted correlate with earlier age of onset.\",\n      \"method\": \"Immunocytochemistry, western blot, tracking through secretory pathway in mammalian cell lines; comprehensive genotype-phenotype correlation\",\n      \"journal\": \"Human mutation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (immunocytochemistry, western blot, secretion assay) across eight mutations with genotype-phenotype validation, single lab but comprehensive\",\n      \"pmids\": [\"25230692\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Cochlin is cleaved by aggrecanase-1 (ADAMTS-4) during inflammation, releasing the LCCL domain as a secreted fragment. DFNA9-linked mutations in cochlin (P51S, V66G, G88E, I109T, W117R, V123E, C162Y) all demonstrate significantly reduced susceptibility to aggrecanase cleavage (novel V123E mutant shows ~20.5% of wild-type cleavage efficiency), suggesting that impaired post-translational LCCL domain cleavage may contribute to DFNA9 pathogenesis.\",\n      \"method\": \"In vitro aggrecanase cleavage assay on wild-type and mutant cochlins expressed in mammalian cells\",\n      \"journal\": \"Human mutation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct enzymatic cleavage assay on multiple mutants, single lab, establishes aggrecanase-1 as a processing enzyme for cochlin\",\n      \"pmids\": [\"26256111\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Homozygous nonsense variants in COCH (c.292C>T, p.Arg98*) cause autosomal recessive prelingual deafness with early-onset vestibular dysfunction. Heterozygous carriers have normal hearing, establishing that biallelic loss-of-function of COCH is sufficient to cause hearing loss via a recessive mechanism distinct from the dominant-negative mechanism of DFNA9 missense mutations.\",\n      \"method\": \"Genetic analysis (sequencing), family co-segregation study, audiological and vestibular phenotyping\",\n      \"journal\": \"European journal of human genetics : EJHG\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic and phenotypic evidence in a human family establishing recessive loss-of-function as a distinct mechanism, single report\",\n      \"pmids\": [\"29449721\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Novel COCH loss-of-function variants (two nonsense, one missense, one in-frame deletion) cause autosomal recessive nonsyndromic hearing loss. Minigene splicing assays demonstrate that the missense and in-frame deletion variants alter RNA splicing by creating an exon splicing silencer and abolishing an exon splicing enhancer, respectively, leading to frameshifts and predicted null alleles.\",\n      \"method\": \"Targeted gene panels, exome sequencing, minigene splicing assay\",\n      \"journal\": \"Human genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional minigene assays demonstrate splicing mechanism, single lab\",\n      \"pmids\": [\"32562050\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"A homozygous frameshift COCH variant in a human family results in major decrease in cochlin translation and loss-of-function, as demonstrated using COS7 cell lines, providing the first direct evidence of DFNB110 (recessive) cochlin loss-of-function at the protein level.\",\n      \"method\": \"COS7 cell line expression studies, western blot analysis of cochlin translation\",\n      \"journal\": \"European journal of human genetics : EJHG\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — cell-based functional assay demonstrating loss of cochlin protein, single lab\",\n      \"pmids\": [\"32939038\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Cochlin binds selectively to highly sulfated glycosaminoglycans (GAGs), specifically heparin, via N-sulfation-dependent interaction (N-desulfation abolishes binding; 2-O- and 6-O-desulfation do not). All DFNA9 point mutations diminish cochlin binding to GAGs. Mouse cochlea contains moderately sulfated GAGs that cochlin (as cochlin/Fc fusion) binds, suggesting cochlin-GAG interaction is relevant to cochlear extracellular matrix function.\",\n      \"method\": \"Cochlin reporter cell β-galactosidase assay, GAG binding assay with desulfation controls, immunostaining of mouse cochlea with cochlin/Fc fusion protein, GAG composition analysis\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct binding assay with multiple desulfation controls and mutant panel, single lab\",\n      \"pmids\": [\"35901072\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"COCH-expressing neurons in the distal ventral CA3 hippocampus co-express Mtf1 and Cacna1h. MTF1 activates Cacna1h transcription in these neurons, enabling burst action potentials. COCH neurons synapse directly with GABAergic inhibitory neurons in the lateral septum and mediate social-stress-induced anxiety-like behavior.\",\n      \"method\": \"Genetic targeting of COCH-expressing neurons, transcriptome analysis, electrophysiology, circuit tracing, behavioral assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic targeting with circuit tracing and behavioral readouts, single lab, establishes COCH neuron circuit function\",\n      \"pmids\": [\"34965426\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Loss of Cochlin (Cochlin-/- mice) causes progressive alterations in collagen fibril organization in flexor tendons by 3 months of age and significant declines in tendon structural and material mechanical properties by 6 months. The Cochlin-/- tendon proteome shows consistent decreases in proteins associated with RNA metabolism, extracellular matrix production, and cytoskeleton, establishing Cochlin as a critical extracellular matrix protein for tendon homeostasis.\",\n      \"method\": \"Cochlin-/- knockout mouse model, collagen fibril imaging, biomechanical testing, quantitative proteomics\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — knockout mouse with multiple functional readouts (histology, biomechanics, proteomics), preprint\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Cochlin, expressed in brain barrier tissues including the pineal gland, area postrema, choroid plexus and meninges of zebrafish, mice and humans, contributes to brain defense against bacterial infection. Cochlin expression transiently increases upon Mycobacterium marinum infection in zebrafish larvae; delivery of recombinant cochlin reduces bacterial load; cochlin mutation inhibits bacterial clearance from the brain; and supplying the LCCL domain reverses this deficit, establishing the cleaved LCCL domain as the active antibacterial moiety.\",\n      \"method\": \"Transcriptome analysis, in situ hybridization, recombinant cochlin delivery, cochlin mutant zebrafish, LCCL domain rescue experiment\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple methods including loss-of-function and rescue with defined domain in zebrafish model, preprint\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"Cochlin (encoded by COCH) is a secreted extracellular matrix glycoprotein, abundantly expressed in inner ear fibrocytes, whose N-terminal LCCL domain (with a novel NMR-solved fold) undergoes proteolytic cleavage by aggrecanase-1, self-assembles into matrix deposits alongside fibronectin, and binds sulfated heparan sulfate/heparin in a N-sulfation-dependent manner; DFNA9-causing missense mutations in the LCCL domain cause protein misfolding and aberrant disulfide-bonded dimerization/aggregation that can block secretion and matrix integration or disrupt cleavage and GAG binding (dominant-negative/gain-of-function), while biallelic truncating variants cause recessive hearing loss through loss-of-function; in the brain, the cleaved LCCL domain acts as an innate immune effector at barrier tissues, and in the hippocampus COCH-expressing CA3 neurons drive social-stress-induced anxiety via MTF1-regulated Cacna1h burst firing onto lateral septal GABAergic neurons.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"COCH encodes cochlin, a secreted extracellular matrix glycoprotein built from an N-terminal LCCL (FCH) domain and two collagen-binding type A (vWFA) domains, expressed at high levels in fibrocytes of the cochlear spiral limbus and ligament and the vestibular crista ampullaris [#0, #1, #2]. Cochlin is among the most abundant proteins of the inner ear [#10], transits the ER/Golgi secretory pathway, is N-glycosylated, and is proteolytically cleaved between the LCCL and vWFA domains \\u2014 a cleavage mediated by aggrecanase-1 (ADAMTS-4) during inflammation that releases the LCCL domain as a soluble fragment [#5, #16]. Secreted cochlin self-assembles into extracellular deposits that co-localize with fibronectin and binds selectively to highly N-sulfated glycosaminoglycans such as heparin [#6, #20]; loss of cochlin disrupts collagen fibril organization and tendon mechanical properties, underscoring a structural ECM role beyond the ear [#22]. Dominant missense mutations in the LCCL and vWFA domains cause DFNA9 sensorineural hearing loss and vestibular dysfunction through a dominant-negative/gain-of-function mechanism: the NMR-defined LCCL fold misfolds, mutant cochlin forms aberrant stable disulfide-bonded dimers and cytotoxic oligomers, and these mutants show impaired ECM integration, reduced aggrecanase cleavage, and diminished GAG binding [#1, #3, #12, #15, #16, #20]; knockout mice retain normal early hearing, excluding haploinsufficiency, while G88E knock-in mice phenocopy the dominant disease [#9, #11, #13]. In contrast, biallelic truncating/loss-of-function variants cause recessive nonsyndromic hearing loss (DFNB110) through loss of cochlin protein [#17, #19]. The cleaved LCCL domain additionally functions as an innate antibacterial effector at brain barrier tissues [#23], and a distinct population of COCH-expressing CA3 hippocampal neurons drives social-stress-induced anxiety via MTF1-activated Cacna1h burst firing onto lateral septal GABAergic neurons [#21].\",\n  \"teleology\": [\n    {\n      \"year\": 1997,\n      \"claim\": \"Established cochlin as a candidate secreted ECM protein with collagen-binding vWFA domains and inner-ear-restricted expression, defining the molecular starting point.\",\n      \"evidence\": \"cDNA cloning, domain/sequence analysis, and tissue expression panel\",\n      \"pmids\": [\"9441737\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No direct demonstration of secretion or matrix function\", \"LCCL domain function not yet defined\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Linked COCH missense mutations in the LCCL domain to dominant DFNA9 hearing loss and vestibular dysfunction, tying the gene to a defined Mendelian phenotype and to pathological ground-substance deposits.\",\n      \"evidence\": \"Mutation sequencing across kindreds and in situ hybridization of inner ear sections\",\n      \"pmids\": [\"9806553\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism connecting mutation to deposits unresolved\", \"Dominant vs loss-of-function basis unknown\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Resolved the LCCL domain fold and showed most DFNA9 mutations destabilize it, providing structural rationale for pathogenicity.\",\n      \"evidence\": \"NMR structure with bacterial expression and folding assessment of mutant domains\",\n      \"pmids\": [\"11574466\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Folding tested only for isolated bacterial domain, not full-length glycosylated protein\", \"Binding partner blocked by W117R not identified\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Localized cochlin protein and mRNA to the fibrocytes lost in DFNA9 temporal bones and detected processed isoforms, connecting expression to disease histopathology.\",\n      \"evidence\": \"In situ hybridization, immunohistochemistry, western blot of fetal cochlear extracts; 2D proteomics of bovine inner ear\",\n      \"pmids\": [\"11709536\", \"11278165\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity and origin of smaller isoforms not yet defined\", \"Processing enzymes unknown\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Defined cochlin's secretory route, N-glycosylation, and proteolytic separation of the LCCL from vWFA domains, and showed mutants are still secreted \\u2014 shifting pathogenesis to the extracellular space.\",\n      \"evidence\": \"Transfection with secretion/glycosylation assays, immunocytochemistry, plus matrix deposition immunofluorescence\",\n      \"pmids\": [\"12843317\", \"12928864\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Protease responsible for cleavage not identified\", \"Self-assembly vs partner-complex basis of deposition unresolved\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Identified the perilymph-specific LCCL-containing CTP fragment, establishing that the mutation-bearing domain is liberated as a distinct circulating isoform.\",\n      \"evidence\": \"Isoform-specific antibody western blots of perilymph vs tissue in human and bovine samples\",\n      \"pmids\": [\"14733925\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional role of CTP not addressed\", \"Single-lab antibody-based detection\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Genetic knockout established that DFNA9 is not haploinsufficiency, pointing to a dominant-negative/gain-of-function disease mechanism.\",\n      \"evidence\": \"Coch knockout mouse with ABR phenotyping and LacZ reporter expression mapping\",\n      \"pmids\": [\"16078052\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular nature of dominant-negative effect not shown\", \"Late-onset null phenotype not yet characterized\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Confirmed cochlin as the principal protein of the DFNA9 inner ear deposits and demonstrated its extracellular stability, linking aggregation to disease morphology.\",\n      \"evidence\": \"Proteomics and immunohistochemistry on temporal bones with knockout comparison\",\n      \"pmids\": [\"16481359\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Biochemical trigger of in vivo aggregation not defined\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"A G88E knock-in showed dominant heterozygous progressive vestibular-then-auditory decline, modeling DFNA9 and confirming the dominant-negative mechanism in vivo.\",\n      \"evidence\": \"Knock-in mouse with VsEP, ABR, DPOAE across ages\",\n      \"pmids\": [\"18697796\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of vestibular-before-cochlear sequence unexplained\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Demonstrated the biochemical mechanism of dominant negativity: mutant cochlin forms stable disulfide dimers, recruits wild-type protein into reducing-resistant cytotoxic oligomers, and is toxic in vivo.\",\n      \"evidence\": \"Non-reducing/reducing western blots, cytotoxicity assays in vitro and in vivo; combined with paired knockout/knock-in ABR-VsEP epistasis\",\n      \"pmids\": [\"20228067\", \"21073934\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Aggregation pathway and cytotoxic species not structurally defined\", \"Single-lab biochemistry\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Showed vWFA2-domain mutations (F527C) can drive aberrant disulfide-bonded complexes retained in the ER/Golgi while sparing collagen binding, extending pathogenic mechanisms beyond the LCCL domain.\",\n      \"evidence\": \"Transfection, reducing/non-reducing western blot, recombinant vWFA2 biochemistry\",\n      \"pmids\": [\"22610276\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vivo consequences of ER retention not tested\", \"Single-lab\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Resolved two mechanistic classes of DFNA9 mutation \\u2014 vWFA aggregation/ER-block vs LCCL intracellular dimers \\u2014 both abolishing secretion, and correlated them with genotype-phenotype and onset.\",\n      \"evidence\": \"Secretory-pathway tracking across eight mutations with clinical correlation\",\n      \"pmids\": [\"25230692\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Why domain location dictates vestibular vs auditory bias not mechanistically explained\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Identified aggrecanase-1 (ADAMTS-4) as the protease that cleaves cochlin and releases the LCCL domain during inflammation, and showed DFNA9 mutations impair this cleavage.\",\n      \"evidence\": \"In vitro aggrecanase cleavage assays on wild-type and mutant cochlins\",\n      \"pmids\": [\"26256111\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vivo relevance of impaired cleavage to deposits not demonstrated\", \"Single-lab\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Established a distinct recessive disease mechanism: biallelic truncating COCH variants cause prelingual deafness via loss-of-function, separating DFNB110 from dominant DFNA9.\",\n      \"evidence\": \"Sequencing and family co-segregation with audiovestibular phenotyping\",\n      \"pmids\": [\"29449721\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Protein-level confirmation absent in this report\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Extended and validated the recessive loss-of-function mechanism, showing splicing-disrupting and frameshift variants yield null alleles and loss of cochlin protein.\",\n      \"evidence\": \"Minigene splicing assays and COS7 expression/western blot\",\n      \"pmids\": [\"32562050\", \"32939038\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No tissue-level confirmation of protein loss in patients\", \"Single-lab assays\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Identified cochlin's selective N-sulfation-dependent binding to heparin/highly sulfated GAGs and showed all DFNA9 mutations diminish this binding, defining a matrix-anchoring activity disrupted in disease.\",\n      \"evidence\": \"Reporter-cell GAG binding assays with desulfation controls, cochlin/Fc cochlear immunostaining, GAG composition analysis\",\n      \"pmids\": [\"35901072\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Which domain mediates GAG binding not localized\", \"Physiological consequence of disrupted binding not tested in vivo\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Revealed an unexpected neuronal role: COCH marks a CA3 hippocampal population that uses MTF1-driven Cacna1h burst firing onto lateral septal GABAergic neurons to mediate social-stress anxiety.\",\n      \"evidence\": \"Genetic targeting, transcriptomics, electrophysiology, circuit tracing, behavior in mice\",\n      \"pmids\": [\"34965426\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether secreted cochlin protein contributes to this circuit, vs COCH as a marker, is unclear\", \"Single-lab\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Showed cochlin is required for tendon collagen fibril organization and mechanics, generalizing its structural ECM role beyond the inner ear.\",\n      \"evidence\": \"Cochlin knockout mouse with fibril imaging, biomechanics, and proteomics (preprint)\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Preprint, not peer-reviewed\", \"Molecular interactions in tendon matrix not defined\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Assigned an innate-immune effector function to the cleaved LCCL domain at brain barrier tissues, with loss-of-function and domain-rescue establishing it as the antibacterial moiety.\",\n      \"evidence\": \"Transcriptomics, in situ hybridization, recombinant cochlin/LCCL delivery and mutant rescue in zebrafish (preprint)\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Preprint, not peer-reviewed\", \"Mechanism of bacterial clearance unknown\", \"Mammalian relevance not established\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How cochlin's normal matrix-organizing, GAG-binding, and antibacterial functions integrate, and the structural identity of the cytotoxic mutant aggregate species in DFNA9, remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structure of the full-length protein or its oligomeric deposits\", \"Endogenous binding partner blocked by W117R never identified\", \"Relationship between ear ECM role and neuronal/immune roles unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [6, 22]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [20]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [5, 6, 7]},\n      {\"term_id\": \"GO:0031012\", \"supporting_discovery_ids\": [6, 10, 22]},\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [5, 14]},\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [5, 14]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1474244\", \"supporting_discovery_ids\": [6, 22]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [1, 15, 17]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [23]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"FN1\", \"ADAMTS4\", \"MTF1\", \"CACNA1H\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}