{"gene":"CLCN7","run_date":"2026-06-09T22:57:18","timeline":{"discoveries":[{"year":2008,"finding":"ClC-7 is a Cl-/H+ antiporter that constitutes the primary (predominant) Cl- permeability of the lysosomal membrane. siRNA knockdown of ClC-7 essentially ablates lysosomal Cl-/H+ antiport activity and strongly diminishes the ability of lysosomes to acidify in vivo, demonstrating ClC-7's essential role in lysosomal acidification.","method":"Direct electrophysiological measurement of anion transport in isolated lysosomes; siRNA knockdown with functional readout of Cl-/H+ antiport activity and lysosomal acidification","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct in vitro reconstitution/electrophysiology of lysosomal transport combined with siRNA knockdown and functional acidification assay; replicated by multiple subsequent studies","pmids":["18449189"],"is_preprint":false},{"year":2006,"finding":"ClC-7 requires Ostm1 as an obligate β-subunit. The two proteins co-localize in late endosomes/lysosomes and the ruffled border of osteoclasts, form a molecular complex by co-immunoprecipitation, and Ostm1 stabilizes ClC-7 protein (ClC-7 protein levels fall below 10% in Ostm1-deficient tissues). ClC-7 is required for Ostm1 to reach lysosomes, where the highly glycosylated Ostm1 luminal domain is then cleaved.","method":"Co-immunoprecipitation, co-localization by immunofluorescence, protein-level analysis in grey-lethal (Ostm1-deficient) mice, subcellular fractionation","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, co-localization, genetic mouse model with protein-level quantification; independently confirmed by cryo-EM structural studies","pmids":["16525474"],"is_preprint":false},{"year":2020,"finding":"Cryo-EM structures of CLC-7 alone and in complex with OSTM1 resolved to 2.8 Å reveal that the luminal surface of CLC-7 is entirely covered by a dimer of heavily glycosylated, disulfide-bonded OSTM1, which protects CLC-7 from the degradative lysosomal lumen. OSTM1 binding does not induce large-scale rearrangements of CLC-7 but has minor effects on the ion-conduction pathway conformation.","method":"Cryo-electron microscopy structure determination","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1 / Strong — high-resolution cryo-EM structure with two independent structural studies (Schrecker et al. and Zhang et al., both 2020) providing orthogonal validation","pmids":["32749217","32851177"],"is_preprint":false},{"year":2020,"finding":"Cryo-EM structure of human CLC-7/Ostm1 shows that the glycosylated Ostm1 acts as a lid positioned above CLC-7 and interacts extensively with CLC-7 within the membrane. Structural and electrophysiology analyses indicate that domain interaction interfaces between the N-terminus, transmembrane domain (TMD), and CBS domains of CLC-7 affect its slow gating kinetics.","method":"Cryo-EM structure determination; electrophysiology","journal":"Science advances","confidence":"High","confidence_rationale":"Tier 1 / Strong — cryo-EM plus functional electrophysiology in a single study, corroborated by independent contemporaneous structure","pmids":["32851177"],"is_preprint":false},{"year":2005,"finding":"ClC-7 knockout mice develop lysosomal storage disease and neurodegeneration (accumulation of electron-dense material, autofluorescent structures, subunit c of mitochondrial ATP synthase, microglial activation, astrogliosis) despite unchanged lysosomal pH in cultured neurons, demonstrating a role for ClC-7 in lysosomal function independent of gross pH change in neurons. Rescuing the bone phenotype by osteoclast-specific transgenic expression revealed progressive CNS pathology, showing cell-autonomous neurodegeneration.","method":"Clcn7 knockout mouse model; histology; electron microscopy; transgenic rescue; immunohistochemistry","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — well-characterized knockout mouse with multiple phenotypic readouts and genetic rescue experiment; independently replicated","pmids":["15706348"],"is_preprint":false},{"year":2009,"finding":"ClC-7 is required for lysosomal protein degradation in a cell-autonomous manner. In renal proximal tubular cells lacking ClC-7 (tissue-specific knockout), endocytosed protein half-life increased significantly compared to ClC-7-expressing cells, while endocytosis rates were similar, demonstrating that ClC-7 is specifically required for the degradation step.","method":"Tissue-specific Clcn7 knockout mice; in vivo pulse-chase endocytosis experiments; comparison of endocytosed protein half-life between ClC-7-expressing and ClC-7-deficient cells","journal":"FASEB journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo chimeric knockout with direct pulse-chase comparison, multiple tissue types examined, cell-autonomous effect confirmed","pmids":["19661288"],"is_preprint":false},{"year":2013,"finding":"Slow voltage-dependent activation of ClC-7/Ostm1 operates through a common gate acting on both subunits of the dimer simultaneously (not through independent protopore gates). CBS domain-containing C-terminus is required for this common gating and does not need to be covalently attached to the membrane domain of ClC-7.","method":"Electrophysiology of plasma-membrane-targeted ClC-7/Ostm1; co-expression of transport-deficient and accelerating mutant subunits; truncation and domain swap experiments","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — multiple mutant combinations tested by electrophysiology with rigorous mechanistic interpretation; mechanistically definitive within single study","pmids":["23983121"],"is_preprint":false},{"year":2022,"finding":"PI(3,5)P2 directly inhibits ClC-7 Cl-/H+ transport. Depletion of PI(3,5)P2 by PIKfyve kinase inhibition causes lysosomal hyperacidification primarily via an effect on ClC-7. A disease-causing gain-of-function ClC-7 mutation eliminates PI(3,5)P2 inhibition, linking this regulatory mechanism to disease pathogenesis.","method":"PIKfyve inhibition; direct transport assay of ClC-7; gain-of-function mutant analysis; lysosomal pH measurements","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct lipid inhibition demonstrated with transport assays, genetic gain-of-function mutation corroborates mechanism, multiple orthogonal approaches","pmids":["35670560"],"is_preprint":false},{"year":2025,"finding":"PI(3,5)P2 binding to ClC-7 dramatically remodels ClC-7 structure by inducing close association between cytosolic and transmembrane domains. Disease-causing gain-of-function mutations show increased transport activity through loss of PI(3,5)P2 binding. ClC-7 activation correlates with dissociation and increased disorder of the cytoplasmic domain and novel transmembrane domain conformations, revealing the molecular basis of the ClC-7 slow gate regulation by PI(3,5)P2.","method":"Cryo-EM structural analysis; functional transport assays; computational/molecular dynamics analysis; mutagenesis of PI(3,5)P2-binding site","journal":"bioRxiv","confidence":"High","confidence_rationale":"Tier 1 / Moderate — cryo-EM structure plus functional and computational analysis in one study; preprint not yet peer-reviewed but mechanistically rigorous","pmids":[],"is_preprint":true},{"year":2014,"finding":"Both ClC-7 ion transport activity and ClC-7 protein presence (independent of ion transport) are required for different cellular functions. Converting ClC-7 into a Cl- conductance (Clcn7unc/unc) causes lysosomal storage but less severe osteopetrosis; transport-deficient ClC-7 (Clcn7td/td) causes severe osteopetrosis comparable to knockout, but normal coat color and less severe neurodegeneration, indicating that protein-protein interactions (not ion transport) mediate pigmentation, while ion transport is critical for osteopetrosis and lysosomal function.","method":"In vivo structure-function analysis using Clcn7unc/unc (conductance-converted) and Clcn7td/td (transport-deficient) knock-in mice; phenotypic comparison with Clcn7-/- mice","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — three distinct mouse models with orthogonal genetic perturbations, multiple phenotypic readouts, rigorous in vivo structure-function dissection","pmids":["24820037"],"is_preprint":false},{"year":2006,"finding":"Microphthalmia transcription factor (MITF) directly binds to two M-box elements in the Clcn7 promoter and one M-box in the Ostm1 promoter, co-regulating their expression during osteoclastogenesis. MITF transactivates the Clcn7 promoter, and mutation of one M-box abolishes this transactivation. Clcn7 expression is repressed in mi/mi dominant-negative MITF mice.","method":"EMSA; reporter gene assay; chromatin immunoprecipitation; MITF overexpression microarray; analysis of mi/mi mutant mice","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (EMSA, ChIP, reporter assay, in vivo mutant) in a single study establishing direct transcriptional regulation","pmids":["17105730"],"is_preprint":false},{"year":2011,"finding":"In primary microglia, ClC-7 is not efficiently delivered to lysosomes (it is mistargeted and degraded by ER-associated degradation), causing incomplete lysosomal acidification and impaired degradation of fibrillar amyloid-β. Macrophage colony-stimulating factor (M-CSF) activation induces trafficking of ClC-7 to lysosomes, restoring acidification and fAβ degradation. ClC-7 association with Ostm1 is important for correct lysosomal targeting in microglia.","method":"Primary microglia culture; ClC-7 localization by immunofluorescence; lysosomal pH measurement; fAβ degradation assay; M-CSF activation; Ostm1 co-expression","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple functional assays in primary cells but single lab, mechanistic link between mistargeting and lysosomal function established","pmids":["21441306"],"is_preprint":false},{"year":2010,"finding":"The G215R mutation in ClC-7 (causing autosomal dominant osteopetrosis type II) does not abolish Cl-/H+ antiport function but causes a severe trafficking defect, preventing the transporter from reaching the lysosomal membrane in CHO cells. This suggests mislocalization rather than loss of catalytic activity is the primary pathogenic mechanism for G215R.","method":"Solid-supported membrane-based electrophysiology; subcellular localization in CHO cells expressing wild-type vs. G213R rat ClC-7","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — electrophysiology plus localization in a heterologous cell model, single lab but two orthogonal methods","pmids":["20830208"],"is_preprint":false},{"year":2013,"finding":"A Y750Q missense mutation in the CBS2 domain of ClC-7 in Belgian Blue cattle drastically accelerates voltage-dependent gating of ClC-7/Ostm1 while largely preserving lysosomal localization and assembly, providing direct evidence that accelerated ClC-7/Ostm1 gating per se (independent of mislocalization) is sufficient to cause osteopetrosis and lysosomal storage disease.","method":"Autozygosity mapping; genome sequencing; electrophysiology of mutant ClC-7/Ostm1; immunolocalization; clinical/histological phenotyping","journal":"Disease models & mechanisms","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — electrophysiology and localization analysis of disease mutant in a natural animal model, single study","pmids":["24159188"],"is_preprint":false},{"year":2021,"finding":"Wild-type ClC-7 displays large transient capacitive currents that depend on external pH and internal (but not external) Cl-. The proton glutamate mutant E312A strongly reduces but does not abolish stationary transport currents (unlike in other mammalian CLC transporters), suggesting that an alternative proton transfer pathway exists in ClC-7.","method":"Electrophysiology (patch clamp) of plasma membrane-targeted wild-type and E312A mutant ClC-7; analysis of transient capacitive currents and stationary transport currents","journal":"The Journal of general physiology","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — rigorous in vitro electrophysiology with mutagenesis, single lab","pmids":["33211806"],"is_preprint":false},{"year":2024,"finding":"Gain-of-function CLCN7 mutations (p.Tyr715Cys and p.Lys285Thr) causing HOD syndrome (hypopigmentation, organomegaly, delayed myelination) decrease ClC-7 inhibition by PI(3,5)P2, affect residues lining its binding pocket, shift voltage-dependent gating to less positive potentials (an effect partially transferred to WT subunits in heteromers), and induce large lysosomal vacuoles. The vacuole formation requires Cl-/H+ exchange activity as shown by uncoupling mutations. Fibroblasts from p.Y715C patient display giant vacuoles.","method":"Electrophysiology; mutagenesis (uncoupling mutations); PI(3,5)P2 binding analysis; patient fibroblast imaging; vacuole formation assay in transfected cells","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — multiple orthogonal methods (electrophysiology, mutagenesis, patient cell validation, lipid binding assay) in single rigorous study","pmids":["38838776"],"is_preprint":false},{"year":2023,"finding":"ClC-7 gain-of-function mutation (Y715C) causes enlarged lysosomal vacuoles through increased Cl-/H+ exchange activity leading to membrane fusion; degradation of endocytosed material is reduced in these compartments; autophagic clearance is largely impaired resulting in accumulation of autophagic material. The vacuole enlargement requires Cl-/H+ exchange (demonstrated by uncoupling mutations that abrogate it).","method":"Transfection of mutant ClC-7 in cells; combination with uncoupling or current-reducing mutations; lysosomal morphology analysis; autophagic flux assay; endocytosis/degradation assays","journal":"Biomolecules","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal approaches in transfected cell system, single lab, mechanistically informative structure-function dissection","pmids":["38136669"],"is_preprint":false},{"year":2023,"finding":"ClC-7 transport activity is inhibited by low luminal (extracellular in the assay) Cl- concentration, in contrast to ClC-6 which is activated by high luminal Cl-. This distinctive Cl- sensitivity of ClC-7/Ostm1 is proposed to serve as a feedback mechanism limiting excessive intraluminal Cl- accumulation in lysosomes. An osteopetrosis mutant (R762Q) with fast gating kinetics shows altered (reduced) Cl- sensitivity, identifying altered Cl- sensitivity as a plausible disease mechanism.","method":"Electrophysiology of plasma membrane-targeted ClC-7/Ostm1 and ClC-6 with varying extracellular Cl- concentrations; disease mutant analysis","journal":"The Journal of physiology","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — rigorous electrophysiology with multiple conditions and disease variants, single lab","pmids":["37937509"],"is_preprint":false},{"year":2023,"finding":"Genetic knockout of CLCN7 corrects lysosomal swelling and partially corrects lysosomal hyperacidification in FIG4-null cells, placing ClC-7 downstream of PI(3,5)P2 signaling in lysosomal homeostasis. Knockout of the related transporter CLCN6 in FIG4-null cells had no effect on the lysosome phenotype, demonstrating specificity of CLCN7 in this pathway.","method":"Genetic epistasis: CLCN7 and CLCN6 knockout in FIG4-null cell cultures; lysosomal size and pH measurements; in vivo mouse model with dominant-negative CLCN7","journal":"PLoS genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis with specificity controls (CLCN6 negative result), in vitro and in vivo confirmation, single lab","pmids":["37363915"],"is_preprint":false},{"year":2020,"finding":"In PSEN1-deficient cells, ClC-7 delivery from the ER to lysosomes is impaired, reducing lysosomal Cl- content. PKA-mediated (β2-adrenergic agonist-stimulated) facilitation of ClC-7 delivery to lysosomes restores lysosomal Cl-, acidification, proteolysis, calcium homeostasis, and autophagic flux. This identifies a β2-adrenergic/PKA → ClC-7 lysosomal trafficking axis as a mechanism for lysosomal pH regulation.","method":"β2-adrenergic agonist treatment; PKA pathway analysis; ClC-7 subcellular localization by imaging; lysosomal pH, Cl- content, proteolysis, and autophagic flux assays in PSEN1 KO cells and patient fibroblasts; transcriptomics","journal":"Journal of molecular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple functional assays in disease-relevant cells, novel mechanism with pharmacological and genetic support, single lab","pmids":["32105735"],"is_preprint":false},{"year":2017,"finding":"ClC-7 is expressed in the luminal (apical) membrane domain of choroid plexus epithelial cells, where it is proposed to contribute to CSF pH regulation via Cl-/H+ exchange. Cl- gradient-driven changes in intracellular pH and membrane potential consistent with Cl-/H+ exchange were demonstrated by dynamic imaging.","method":"Mass spectrometry proteomics of FACS-isolated choroid plexus epithelial cells; RT-PCR; immunolocalization; dynamic intracellular pH and membrane potential imaging","journal":"American journal of physiology. Cell physiology","confidence":"Low","confidence_rationale":"Tier 3 / Moderate — localization established by immunostaining plus indirect functional evidence from pH imaging, but ClC-7 specifically not isolated as the responsible transporter; single lab","pmids":["29351414"],"is_preprint":false},{"year":2025,"finding":"SNX10 physically interacts with CLC-7 (demonstrated by co-immunoprecipitation). CLC-7 is required for transport of OSTM1-containing lysosomes to the cell periphery in osteoclasts. Loss of CLC-7 depletes peripheral OSTM1-containing lysosomes, establishing a functional link between SNX10, CLC-7, and OSTM1 in regulating lysosome subcellular distribution and osteoclast fusion/function.","method":"Co-immunoprecipitation; immunofluorescence co-localization; analysis of CLC-7-KO osteoclasts for peripheral lysosome distribution; comparison with SNX10-KO and OSTM1-KO phenotypes","journal":"Journal of bone and mineral research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP plus localization in KO cells, multiple KO models compared, single lab","pmids":["41408708"],"is_preprint":false},{"year":2024,"finding":"ClC-7 is essential for phagocytic clearance by microglia in vivo. In zebrafish clcn7 mutants, microglia and embryonic macrophages cannot effectively process apoptotic cells or β-amyloid. Despite these functional defects, microglia develop normally and express normal endosomal/lysosomal markers. The ostm1 (β-subunit) mutant displays a strikingly similar phenotype, consistent with ClC-7/Ostm1 complex being required for microglial lysosomal function.","method":"Zebrafish clcn7 and ostm1 mutant analysis; in vivo phagocytosis assays; microglial development and marker expression analysis","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo loss-of-function in zebrafish with specific functional readouts, corroborated by ostm1 mutant phenocopy, single lab","pmids":["38294065"],"is_preprint":false},{"year":2025,"finding":"CLC-7 depletion (siRNA knockdown or pharmacological inhibition) enhances rAAV transduction efficiency by altering lysosomal chloride homeostasis, selectively reducing the catalytic activity of cathepsins B and L (Cl--dependent) without affecting cathepsin D (Cl--independent), thereby delaying rAAV capsid degradation and facilitating lysosomal escape.","method":"siRNA knockdown; pharmacological inhibition of CLC-7; cathepsin activity assays; rAAV transduction efficiency measurement in vitro and in vivo mouse model","journal":"Journal of medical virology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mechanistic link between CLC-7 activity, lysosomal Cl- homeostasis, and specific cathepsin activity established using pharmacological and genetic tools, single lab","pmids":["41674487"],"is_preprint":false},{"year":1995,"finding":"ClC-7 (89 kDa) and ClC-6 (97 kDa) define a new branch of the CLC chloride channel family; ClC-7 is located on human chromosome 16p13. ClC-7 is the only known eukaryotic CLC protein lacking the conserved glycosylation site between transmembrane domains D8 and D9. Neither ClC-6 nor ClC-7 expressed functional chloride channels in Xenopus oocytes when expressed alone or in combination.","method":"Molecular cloning; heterologous expression in Xenopus oocytes; sequence/hydropathy analysis; chromosomal mapping","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 3 / Strong — cloning and expression study with multiple characterization approaches; negative functional result (no oocyte currents) subsequently explained by absence of Ostm1 β-subunit","pmids":["8543009"],"is_preprint":false}],"current_model":"CLC-7 (CLCN7) is a lysosomal 2Cl-/1H+ antiporter that, in obligate complex with its β-subunit OSTM1 (which covers the luminal face of CLC-7 and stabilizes it), constitutes the primary chloride permeability of the lysosomal membrane; it is slowly activated by membrane depolarization via a common gate that depends on the CBS-domain-containing C-terminus, is tonically inhibited by the signaling lipid PI(3,5)P2 through a mechanism that remodels the cytosolic-transmembrane domain interface, and is essential for lysosomal ion homeostasis, protein degradation, lysosomal acidification, and osteoclast ruffled-border acidification required for bone resorption, with its transcription co-regulated by the MITF transcription factor in osteoclasts and its subcellular trafficking to lysosomes modulated by SNX10 and β2-adrenergic/PKA signaling."},"narrative":{"mechanistic_narrative":"CLCN7 (CLC-7) is a lysosomal 2Cl-/1H+ antiporter that provides the predominant chloride permeability of the lysosomal membrane and is essential for lysosomal ion homeostasis, acidification, and protein degradation [PMID:18449189, PMID:19661288]. It functions in obligate complex with the β-subunit OSTM1: the two proteins co-localize in late endosomes/lysosomes, OSTM1 stabilizes CLC-7 protein, and CLC-7 in turn delivers OSTM1 to lysosomes [PMID:16525474]; cryo-EM structures show a glycosylated, disulfide-bonded OSTM1 dimer forming a lid that covers the luminal surface of CLC-7 and shields it from luminal degradation while interacting extensively within the membrane [PMID:32749217, PMID:32851177]. Transport is governed by a slow common gate that acts on both protomers of the dimer simultaneously and depends on the CBS-domain-containing cytosolic C-terminus [PMID:23983121], which is tonically inhibited by the signaling lipid PI(3,5)P2 through a conformational remodeling that draws the cytosolic and transmembrane domains together [PMID:35670560]. Beyond its catalytic activity, CLC-7 protein has transport-independent roles: in vivo structure-function dissection separates ion transport (critical for osteopetrosis and lysosomal storage) from protein-protein interactions that mediate pigmentation [PMID:24820037]. CLC-7 is required cell-autonomously for lysosomal protein degradation and its loss produces lysosomal storage and neurodegeneration [PMID:15706348, PMID:19661288], for microglial phagocytic clearance of apoptotic cells and amyloid-β [PMID:38294065], and for osteoclast ruffled-border function, with its transcription directly co-regulated with OSTM1 by the MITF transcription factor during osteoclastogenesis [PMID:17105730]. Gain-of-function CLCN7 mutations that lose PI(3,5)P2 inhibition cause HOD syndrome and giant lysosomal vacuoles through excessive Cl-/H+ exchange [PMID:38838776], while trafficking-defective and gating-accelerating mutations cause autosomal dominant osteopetrosis [PMID:20830208, PMID:24159188].","teleology":[{"year":1995,"claim":"Established CLC-7 as a distinct branch of the CLC chloride transporter family, but its function was unknown because it produced no currents when expressed alone.","evidence":"Molecular cloning, heterologous expression in Xenopus oocytes, chromosomal mapping to 16p13","pmids":["8543009"],"confidence":"Medium","gaps":["No functional activity detected in isolation","Requirement for an accessory subunit not yet recognized","Subcellular localization unresolved"]},{"year":2005,"claim":"Defined CLC-7 as essential for lysosomal function in vivo, revealing lysosomal storage and cell-autonomous neurodegeneration distinct from gross pH change.","evidence":"Clcn7 knockout mouse with histology, EM, and osteoclast-specific transgenic rescue","pmids":["15706348"],"confidence":"High","gaps":["Molecular transport mechanism not defined","Reason for normal neuronal lysosomal pH despite storage unexplained"]},{"year":2006,"claim":"Identified OSTM1 as the obligate β-subunit that stabilizes CLC-7 and showed reciprocal trafficking dependence, explaining the earlier null oocyte result.","evidence":"Reciprocal Co-IP, immunofluorescence co-localization, protein quantification in grey-lethal mice","pmids":["16525474"],"confidence":"High","gaps":["Structural basis of stabilization unknown","Mechanism of luminal OSTM1 cleavage not resolved"]},{"year":2006,"claim":"Connected CLC-7 expression to osteoclast biology by establishing MITF as a direct transcriptional regulator of both Clcn7 and Ostm1.","evidence":"EMSA, ChIP, reporter assays, MITF microarray, and mi/mi mutant mice","pmids":["17105730"],"confidence":"High","gaps":["Co-regulatory inputs beyond MITF not mapped","Regulation in non-osteoclast tissues unaddressed"]},{"year":2008,"claim":"Directly demonstrated CLC-7 as the predominant lysosomal Cl-/H+ antiporter required for lysosomal acidification.","evidence":"Electrophysiology of isolated lysosomes plus siRNA knockdown with acidification readout","pmids":["18449189"],"confidence":"High","gaps":["Gating regulation not yet characterized","Coupling stoichiometry not defined here"]},{"year":2009,"claim":"Pinpointed CLC-7 to the degradation step of endocytosed protein, showing the defect is cell-autonomous and not at the endocytosis stage.","evidence":"Tissue-specific Clcn7 knockout with in vivo pulse-chase of endocytosed protein","pmids":["19661288"],"confidence":"High","gaps":["Link between Cl- transport and proteolytic enzyme activity not yet mechanistically defined"]},{"year":2013,"claim":"Resolved the gating architecture, showing slow activation is a common gate on the dimer requiring the CBS-containing C-terminus, which need not be covalently attached.","evidence":"Electrophysiology of plasma-membrane-targeted CLC-7/Ostm1 with mutant co-expression and domain swaps","pmids":["23983121"],"confidence":"High","gaps":["Physiological signal controlling the gate not yet identified","Structural conformations of gating states unresolved"]},{"year":2020,"claim":"Provided the structural basis of the complex, showing the OSTM1 dimer as a protective luminal lid and identifying domain interfaces that tune slow gating.","evidence":"Cryo-EM of CLC-7 and CLC-7/OSTM1 with accompanying electrophysiology","pmids":["32749217","32851177"],"confidence":"High","gaps":["Conformational dynamics during gating not captured by static structures","Regulatory ligand binding sites not yet localized"]},{"year":2014,"claim":"Separated transport-dependent from transport-independent functions of CLC-7 using engineered knock-in mice, showing pigmentation depends on protein interaction while osteopetrosis depends on ion transport.","evidence":"Clcn7unc/unc and Clcn7td/td knock-in mice compared to knockout, multiple phenotypic readouts","pmids":["24820037"],"confidence":"High","gaps":["Identity of transport-independent interaction partners for pigmentation not established"]},{"year":2022,"claim":"Identified PI(3,5)P2 as a direct tonic inhibitor of CLC-7 transport and linked loss of this regulation to gain-of-function disease.","evidence":"PIKfyve inhibition, direct transport assay, gain-of-function mutant, lysosomal pH measurement","pmids":["35670560"],"confidence":"High","gaps":["Structural mechanism of lipid inhibition not yet resolved at this stage"]},{"year":2025,"claim":"Established the structural mechanism of PI(3,5)P2 regulation, showing lipid binding remodels the cytosolic-transmembrane interface to control the slow gate.","evidence":"Cryo-EM, functional transport assays, molecular dynamics, and PI(3,5)P2-site mutagenesis (preprint)","pmids":[],"confidence":"High","gaps":["Preprint not yet peer-reviewed","Kinetics of lipid-induced conformational transitions not fully resolved"]},{"year":2024,"claim":"Connected CLC-7 gain-of-function to human HOD syndrome, demonstrating reduced PI(3,5)P2 inhibition, shifted gating, and Cl-/H+-exchange-dependent vacuole formation.","evidence":"Electrophysiology, uncoupling mutagenesis, PI(3,5)P2 binding analysis, patient fibroblast imaging","pmids":["38838776"],"confidence":"High","gaps":["Tissue-specific basis of hypopigmentation, organomegaly, and delayed myelination not dissected"]},{"year":2025,"claim":"Placed CLC-7 in a trafficking and lysosome-distribution network in osteoclasts via physical interaction with SNX10 and control of peripheral OSTM1-lysosome positioning.","evidence":"Co-IP, co-localization, and comparison of CLC-7-KO, SNX10-KO, and OSTM1-KO osteoclast phenotypes","pmids":["41408708"],"confidence":"Medium","gaps":["Direct SNX10–CLC-7 interface unmapped","Whether SNX10 regulates CLC-7 transport activity unknown"]},{"year":null,"claim":"How CLC-7/OSTM1 gating signals, lipid regulation, and trafficking inputs are integrated to set lysosomal Cl- and pH across different cell types remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["Physiological trigger of slow gating in vivo not identified","Cell-type-specific trafficking determinants incompletely defined","Quantitative model linking Cl- transport to cathepsin/proteolytic output lacking"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005215","term_label":"transporter activity","supporting_discovery_ids":[0,6,14,17]},{"term_id":"GO:0140104","term_label":"molecular carrier activity","supporting_discovery_ids":[0]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[7,8,15,17]},{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[7,8,15]}],"localization":[{"term_id":"GO:0005764","term_label":"lysosome","supporting_discovery_ids":[0,1,4,5]},{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[1]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[1]}],"pathway":[{"term_id":"R-HSA-382551","term_label":"Transport of small molecules","supporting_discovery_ids":[0]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[5]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[16,20]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[10]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[10]}],"complexes":["CLC-7/OSTM1 antiporter complex"],"partners":["OSTM1","SNX10","MITF"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P51798","full_name":"H(+)/Cl(-) exchange transporter 7","aliases":["Chloride channel 7 alpha subunit","Chloride channel protein 7","ClC-7"],"length_aa":805,"mass_kda":88.7,"function":"Slowly voltage-gated channel mediating the exchange of chloride ions against protons (PubMed:18449189, PubMed:21527911). Functions as antiporter and contributes to the acidification of the lysosome lumen and may be involved in maintaining lysosomal pH (PubMed:18449189, PubMed:21527911, PubMed:31155284). The CLC channel family contains both chloride channels and proton-coupled anion transporters that exchange chloride or another anion for protons (By similarity). The presence of conserved gating glutamate residues is typical for family members that function as antiporters (By similarity)","subcellular_location":"Lysosome membrane","url":"https://www.uniprot.org/uniprotkb/P51798/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CLCN7","classification":"Not Classified","n_dependent_lines":2,"n_total_lines":1208,"dependency_fraction":0.0016556291390728477},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000103249","cell_line_id":"CID001656","localizations":[{"compartment":"vesicles","grade":3}],"interactors":[{"gene":"OSTM1","stoichiometry":10.0},{"gene":"SLC15A4","stoichiometry":10.0},{"gene":"BLVRA","stoichiometry":0.2},{"gene":"STK25","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/target/CID001656","total_profiled":1310},"omim":[{"mim_id":"618541","title":"HYPOPIGMENTATION, ORGANOMEGALY, AND DELAYED MYELINATION AND DEVELOPMENT; HOD","url":"https://www.omim.org/entry/618541"},{"mim_id":"618107","title":"OSTEOPETROSIS, AUTOSOMAL DOMINANT 3; OPTA3","url":"https://www.omim.org/entry/618107"},{"mim_id":"615198","title":"OSTEOSCLEROTIC METAPHYSEAL DYSPLASIA; OSMD","url":"https://www.omim.org/entry/615198"},{"mim_id":"612301","title":"OSTEOPETROSIS, AUTOSOMAL RECESSIVE 7; OPTB7","url":"https://www.omim.org/entry/612301"},{"mim_id":"611490","title":"OSTEOPETROSIS,  AUTOSOMAL RECESSIVE 4; OPTB4","url":"https://www.omim.org/entry/611490"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/CLCN7"},"hgnc":{"alias_symbol":["CLC-7","OPTA2","CLC7","ClC-7","PPP1R63"],"prev_symbol":[]},"alphafold":{"accession":"P51798","domains":[{"cath_id":"1.10.3080.10","chopping":"121-146_202-347","consensus_level":"medium","plddt":89.8542,"start":121,"end":347},{"cath_id":"1.10.3080.10","chopping":"377-412_470-610","consensus_level":"medium","plddt":91.0135,"start":377,"end":610},{"cath_id":"3.10.580.10","chopping":"628-804","consensus_level":"high","plddt":83.7363,"start":628,"end":804}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P51798","model_url":"https://alphafold.ebi.ac.uk/files/AF-P51798-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P51798-F1-predicted_aligned_error_v6.png","plddt_mean":80.94},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CLCN7","jax_strain_url":"https://www.jax.org/strain/search?query=CLCN7"},"sequence":{"accession":"P51798","fasta_url":"https://rest.uniprot.org/uniprotkb/P51798.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P51798/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P51798"}},"corpus_meta":[{"pmid":"18449189","id":"PMC_18449189","title":"The Cl-/H+ antiporter ClC-7 is the primary chloride permeation pathway in lysosomes.","date":"2008","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/18449189","citation_count":319,"is_preprint":false},{"pmid":"15706348","id":"PMC_15706348","title":"Loss of the chloride channel ClC-7 leads to lysosomal storage disease and neurodegeneration.","date":"2005","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/15706348","citation_count":288,"is_preprint":false},{"pmid":"11741829","id":"PMC_11741829","title":"Albers-Schönberg disease (autosomal dominant osteopetrosis, type II) results from mutations in the ClCN7 chloride channel gene.","date":"2001","source":"Human molecular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/11741829","citation_count":283,"is_preprint":false},{"pmid":"16525474","id":"PMC_16525474","title":"ClC-7 requires Ostm1 as a beta-subunit to support bone resorption and lysosomal function.","date":"2006","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/16525474","citation_count":271,"is_preprint":false},{"pmid":"14584882","id":"PMC_14584882","title":"Chloride channel ClCN7 mutations are responsible for severe recessive, dominant, and intermediate osteopetrosis.","date":"2003","source":"Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research","url":"https://pubmed.ncbi.nlm.nih.gov/14584882","citation_count":179,"is_preprint":false},{"pmid":"8543009","id":"PMC_8543009","title":"ClC-6 and ClC-7 are two novel broadly expressed members of the CLC chloride channel family.","date":"1995","source":"FEBS letters","url":"https://pubmed.ncbi.nlm.nih.gov/8543009","citation_count":156,"is_preprint":false},{"pmid":"15111300","id":"PMC_15111300","title":"Characterization of osteoclasts from patients harboring a G215R mutation in ClC-7 causing autosomal dominant osteopetrosis type II.","date":"2004","source":"The American journal of pathology","url":"https://pubmed.ncbi.nlm.nih.gov/15111300","citation_count":101,"is_preprint":false},{"pmid":"21441306","id":"PMC_21441306","title":"Degradation of Alzheimer's amyloid fibrils by microglia requires delivery of ClC-7 to lysosomes.","date":"2011","source":"Molecular biology of the cell","url":"https://pubmed.ncbi.nlm.nih.gov/21441306","citation_count":86,"is_preprint":false},{"pmid":"12929941","id":"PMC_12929941","title":"Chloride channel 7 (ClCN7) gene mutations and autosomal dominant osteopetrosis, type II.","date":"2003","source":"Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research","url":"https://pubmed.ncbi.nlm.nih.gov/12929941","citation_count":81,"is_preprint":false},{"pmid":"19661288","id":"PMC_19661288","title":"Lysosomal degradation of endocytosed proteins depends on the chloride transport protein ClC-7.","date":"2009","source":"FASEB journal : official publication of the Federation of American Societies for Experimental Biology","url":"https://pubmed.ncbi.nlm.nih.gov/19661288","citation_count":78,"is_preprint":false},{"pmid":"12522560","id":"PMC_12522560","title":"Chloride channel 7 (CLCN7) gene mutations in intermediate autosomal recessive osteopetrosis.","date":"2002","source":"Human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/12522560","citation_count":66,"is_preprint":false},{"pmid":"19953639","id":"PMC_19953639","title":"Molecular and clinical heterogeneity in CLCN7-dependent osteopetrosis: report of 20 novel mutations.","date":"2010","source":"Human mutation","url":"https://pubmed.ncbi.nlm.nih.gov/19953639","citation_count":65,"is_preprint":false},{"pmid":"17105730","id":"PMC_17105730","title":"The expression of Clcn7 and Ostm1 in osteoclasts is coregulated by microphthalmia transcription factor.","date":"2006","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/17105730","citation_count":64,"is_preprint":false},{"pmid":"35670560","id":"PMC_35670560","title":"Tonic inhibition of the chloride/proton antiporter ClC-7 by PI(3,5)P2 is crucial for lysosomal pH maintenance.","date":"2022","source":"eLife","url":"https://pubmed.ncbi.nlm.nih.gov/35670560","citation_count":62,"is_preprint":false},{"pmid":"32749217","id":"PMC_32749217","title":"Cryo-EM structure of the lysosomal chloride-proton exchanger CLC-7 in complex with OSTM1.","date":"2020","source":"eLife","url":"https://pubmed.ncbi.nlm.nih.gov/32749217","citation_count":59,"is_preprint":false},{"pmid":"21107136","id":"PMC_21107136","title":"Distinct neuropathologic phenotypes after disrupting the chloride transport proteins ClC-6 or ClC-7/Ostm1.","date":"2010","source":"Journal of neuropathology and experimental neurology","url":"https://pubmed.ncbi.nlm.nih.gov/21107136","citation_count":53,"is_preprint":false},{"pmid":"32851177","id":"PMC_32851177","title":"Molecular insights into the human CLC-7/Ostm1 transporter.","date":"2020","source":"Science advances","url":"https://pubmed.ncbi.nlm.nih.gov/32851177","citation_count":50,"is_preprint":false},{"pmid":"24820037","id":"PMC_24820037","title":"Transport activity and presence of ClC-7/Ostm1 complex account for different cellular functions.","date":"2014","source":"EMBO reports","url":"https://pubmed.ncbi.nlm.nih.gov/24820037","citation_count":50,"is_preprint":false},{"pmid":"20830208","id":"PMC_20830208","title":"The G215R mutation in the Cl-/H+-antiporter ClC-7 found in ADO II osteopetrosis does not abolish function but causes a severe trafficking defect.","date":"2010","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/20830208","citation_count":42,"is_preprint":false},{"pmid":"23983121","id":"PMC_23983121","title":"Common gating of both CLC transporter subunits underlies voltage-dependent activation of the 2Cl-/1H+ exchanger ClC-7/Ostm1.","date":"2013","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/23983121","citation_count":40,"is_preprint":false},{"pmid":"24108692","id":"PMC_24108692","title":"CLCN7 and TCIRG1 mutations differentially affect bone matrix mineralization in osteopetrotic individuals.","date":"2014","source":"Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research","url":"https://pubmed.ncbi.nlm.nih.gov/24108692","citation_count":38,"is_preprint":false},{"pmid":"24159188","id":"PMC_24159188","title":"A missense mutation accelerating the gating of the lysosomal Cl-/H+-exchanger ClC-7/Ostm1 causes osteopetrosis with gingival hamartomas in cattle.","date":"2013","source":"Disease models & mechanisms","url":"https://pubmed.ncbi.nlm.nih.gov/24159188","citation_count":37,"is_preprint":false},{"pmid":"33905594","id":"PMC_33905594","title":"Efficient generation of osteoclasts from human induced pluripotent stem cells and functional investigations of lethal CLCN7-related osteopetrosis.","date":"2021","source":"Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research","url":"https://pubmed.ncbi.nlm.nih.gov/33905594","citation_count":36,"is_preprint":false},{"pmid":"11846422","id":"PMC_11846422","title":"Activation by acidic pH of CLC-7 expressed in oocytes from Xenopus laevis.","date":"2002","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/11846422","citation_count":35,"is_preprint":false},{"pmid":"25943117","id":"PMC_25943117","title":"The ClC-7 Chloride Channel Is Downregulated by Hypoosmotic Stress in Human Chondrocytes.","date":"2015","source":"Molecular pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/25943117","citation_count":31,"is_preprint":false},{"pmid":"20599900","id":"PMC_20599900","title":"Severe developmental bone phenotype in ClC-7 deficient mice.","date":"2010","source":"Developmental biology","url":"https://pubmed.ncbi.nlm.nih.gov/20599900","citation_count":31,"is_preprint":false},{"pmid":"11326746","id":"PMC_11326746","title":"Localization of mouse CLC-6 and CLC-7 mRNA and their functional complementation of yeast CLC gene mutant.","date":"2001","source":"Histochemistry and cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/11326746","citation_count":31,"is_preprint":false},{"pmid":"32105735","id":"PMC_32105735","title":"β2-adrenergic Agonists Rescue Lysosome Acidification and Function in PSEN1 Deficiency by Reversing Defective ER-to-lysosome Delivery of ClC-7.","date":"2020","source":"Journal of molecular biology","url":"https://pubmed.ncbi.nlm.nih.gov/32105735","citation_count":30,"is_preprint":false},{"pmid":"16391718","id":"PMC_16391718","title":"The role of chloride channels in osteoclasts: ClC-7 as a target for osteoporosis treatment.","date":"2005","source":"Drug news & perspectives","url":"https://pubmed.ncbi.nlm.nih.gov/16391718","citation_count":29,"is_preprint":false},{"pmid":"30867839","id":"PMC_30867839","title":"ClC-7 Regulates the Pattern and Early Development of Craniofacial Bone and Tooth.","date":"2019","source":"Theranostics","url":"https://pubmed.ncbi.nlm.nih.gov/30867839","citation_count":28,"is_preprint":false},{"pmid":"15231021","id":"PMC_15231021","title":"In vitro differentiation of CD14 cells from osteopetrotic subjects: contrasting phenotypes with TCIRG1, CLCN7, and attachment defects.","date":"2004","source":"Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research","url":"https://pubmed.ncbi.nlm.nih.gov/15231021","citation_count":28,"is_preprint":false},{"pmid":"16234969","id":"PMC_16234969","title":"Polymorphisms of the CLCN7 gene are associated with BMD in women.","date":"2005","source":"Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research","url":"https://pubmed.ncbi.nlm.nih.gov/16234969","citation_count":27,"is_preprint":false},{"pmid":"16368748","id":"PMC_16368748","title":"Polymorphisms in the CLCN7 gene modulate bone density in postmenopausal women and in patients with autosomal dominant osteopetrosis type II.","date":"2005","source":"The Journal of clinical endocrinology and metabolism","url":"https://pubmed.ncbi.nlm.nih.gov/16368748","citation_count":26,"is_preprint":false},{"pmid":"14564431","id":"PMC_14564431","title":"Type II benign osteopetrosis (Albers-Schönberg disease) caused by a novel mutation in CLCN7 presenting with unusual clinical manifestations.","date":"2003","source":"Calcified tissue international","url":"https://pubmed.ncbi.nlm.nih.gov/14564431","citation_count":26,"is_preprint":false},{"pmid":"19288050","id":"PMC_19288050","title":"Identification of the CLCN7 gene mutations in two Chinese families with autosomal dominant osteopetrosis (type II).","date":"2009","source":"Journal of bone and mineral metabolism","url":"https://pubmed.ncbi.nlm.nih.gov/19288050","citation_count":25,"is_preprint":false},{"pmid":"21962762","id":"PMC_21962762","title":"Report of two Chinese patients suffering from CLCN7-related osteopetrosis and root dysplasia.","date":"2011","source":"Journal of cranio-maxillo-facial surgery : official publication of the European Association for Cranio-Maxillo-Facial Surgery","url":"https://pubmed.ncbi.nlm.nih.gov/21962762","citation_count":25,"is_preprint":false},{"pmid":"26325626","id":"PMC_26325626","title":"Effective Small Interfering RNA Therapy to Treat CLCN7-dependent Autosomal Dominant Osteopetrosis Type 2.","date":"2015","source":"Molecular therapy. Nucleic acids","url":"https://pubmed.ncbi.nlm.nih.gov/26325626","citation_count":23,"is_preprint":false},{"pmid":"21947783","id":"PMC_21947783","title":"The virulence gene and clinical phenotypes of osteopetrosis in the Chinese population: six novel mutations of the CLCN7 gene in twelve osteopetrosis families.","date":"2011","source":"Journal of bone and mineral metabolism","url":"https://pubmed.ncbi.nlm.nih.gov/21947783","citation_count":22,"is_preprint":false},{"pmid":"26395888","id":"PMC_26395888","title":"Novel mutations of CLCN7 cause autosomal dominant osteopetrosis type II (ADO-II) and intermediate autosomal recessive osteopetrosis (IARO) in Chinese patients.","date":"2015","source":"Osteoporosis international : a journal established as result of cooperation between the European Foundation for Osteoporosis and the National Osteoporosis Foundation of the USA","url":"https://pubmed.ncbi.nlm.nih.gov/26395888","citation_count":22,"is_preprint":false},{"pmid":"19543743","id":"PMC_19543743","title":"Characteristics of ClC7 Cl- channels and their inhibition in mutant (G215R) associated with autosomal dominant osteopetrosis type II in native osteoclasts and hClcn7 gene-expressing cells.","date":"2009","source":"Pflugers Archiv : European journal of physiology","url":"https://pubmed.ncbi.nlm.nih.gov/19543743","citation_count":21,"is_preprint":false},{"pmid":"33125761","id":"PMC_33125761","title":"Pathobiologic Mechanisms of Neurodegeneration in Osteopetrosis Derived From Structural and Functional Analysis of 14 ClC-7 Mutants.","date":"2020","source":"Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research","url":"https://pubmed.ncbi.nlm.nih.gov/33125761","citation_count":19,"is_preprint":false},{"pmid":"19070589","id":"PMC_19070589","title":"Characterization of acid flux in osteoclasts from patients harboring a G215R mutation in ClC-7.","date":"2008","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/19070589","citation_count":18,"is_preprint":false},{"pmid":"30942407","id":"PMC_30942407","title":"Novel CLCN7 mutations cause autosomal dominant osteopetrosis type II and intermediate autosomal recessive osteopetrosis.","date":"2019","source":"Molecular medicine reports","url":"https://pubmed.ncbi.nlm.nih.gov/30942407","citation_count":16,"is_preprint":false},{"pmid":"26056022","id":"PMC_26056022","title":"Two novel mutations of CLCN7 gene in Chinese families with autosomal dominant osteopetrosis (type II).","date":"2015","source":"Journal of bone and mineral metabolism","url":"https://pubmed.ncbi.nlm.nih.gov/26056022","citation_count":16,"is_preprint":false},{"pmid":"36513280","id":"PMC_36513280","title":"CLCN7, a gene shared by autosomal recessive and autosomal dominant osteopetrosis.","date":"2022","source":"Bone","url":"https://pubmed.ncbi.nlm.nih.gov/36513280","citation_count":15,"is_preprint":false},{"pmid":"26036722","id":"PMC_26036722","title":"A tale of two CLCs: biophysical insights toward understanding ClC-5 and ClC-7 function in endosomes and lysosomes.","date":"2015","source":"The Journal of physiology","url":"https://pubmed.ncbi.nlm.nih.gov/26036722","citation_count":15,"is_preprint":false},{"pmid":"31231577","id":"PMC_31231577","title":"Extra-skeletal manifestations in mice affected by Clcn7-dependent autosomal dominant osteopetrosis type 2 clinical and therapeutic implications.","date":"2019","source":"Bone research","url":"https://pubmed.ncbi.nlm.nih.gov/31231577","citation_count":15,"is_preprint":false},{"pmid":"10500249","id":"PMC_10500249","title":"Complete genomic structure of the CLCN6 and CLCN7 putative chloride channel genes(1).","date":"1999","source":"Biochimica et biophysica acta","url":"https://pubmed.ncbi.nlm.nih.gov/10500249","citation_count":15,"is_preprint":false},{"pmid":"27990310","id":"PMC_27990310","title":"Enhanced but hypofunctional osteoclastogenesis in an autosomal dominant osteopetrosis type II case carrying a c.1856C>T mutation in CLCN7.","date":"2016","source":"Bone research","url":"https://pubmed.ncbi.nlm.nih.gov/27990310","citation_count":15,"is_preprint":false},{"pmid":"26829236","id":"PMC_26829236","title":"ClC-7 Deficiency Impairs Tooth Development and Eruption.","date":"2016","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/26829236","citation_count":14,"is_preprint":false},{"pmid":"37363915","id":"PMC_37363915","title":"The chloride antiporter CLCN7 is a modifier of lysosome dysfunction in FIG4 and VAC14 mutants.","date":"2023","source":"PLoS genetics","url":"https://pubmed.ncbi.nlm.nih.gov/37363915","citation_count":14,"is_preprint":false},{"pmid":"21061117","id":"PMC_21061117","title":"Antibodies against ClC7 inhibit extracellular acidification-induced Cl⁻ currents and bone resorption activity in mouse osteoclasts.","date":"2011","source":"Naunyn-Schmiedeberg's archives of pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/21061117","citation_count":13,"is_preprint":false},{"pmid":"23302420","id":"PMC_23302420","title":"A novel missense mutation in the CLCN7 gene linked to benign autosomal dominant osteopetrosis: a case series.","date":"2013","source":"Journal of medical case reports","url":"https://pubmed.ncbi.nlm.nih.gov/23302420","citation_count":13,"is_preprint":false},{"pmid":"33211806","id":"PMC_33211806","title":"Large transient capacitive currents in wild-type lysosomal Cl-/H+ antiporter ClC-7 and residual transport activity in the proton glutamate mutant E312A.","date":"2021","source":"The Journal of general physiology","url":"https://pubmed.ncbi.nlm.nih.gov/33211806","citation_count":13,"is_preprint":false},{"pmid":"30763735","id":"PMC_30763735","title":"Generation of a human induced pluripotent stem cell line (BIHi002-A) from a patient with CLCN7-related infantile malignant autosomal recessive osteopetrosis.","date":"2018","source":"Stem cell research","url":"https://pubmed.ncbi.nlm.nih.gov/30763735","citation_count":13,"is_preprint":false},{"pmid":"38838776","id":"PMC_38838776","title":"Gain-of-function variants in CLCN7 cause hypopigmentation and lysosomal storage disease.","date":"2024","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/38838776","citation_count":12,"is_preprint":false},{"pmid":"26477479","id":"PMC_26477479","title":"A novel mutation and a known mutation in the CLCN7 gene associated with relatively stable infantile malignant osteopetrosis in a Chinese patient.","date":"2015","source":"Gene","url":"https://pubmed.ncbi.nlm.nih.gov/26477479","citation_count":12,"is_preprint":false},{"pmid":"27540713","id":"PMC_27540713","title":"Autosomal dominant osteopetrosis associated with renal tubular acidosis is due to a CLCN7 mutation.","date":"2016","source":"American journal of medical genetics. Part A","url":"https://pubmed.ncbi.nlm.nih.gov/27540713","citation_count":12,"is_preprint":false},{"pmid":"29351414","id":"PMC_29351414","title":"The murine choroid plexus epithelium expresses the 2Cl-/H+ exchanger ClC-7 and Na+/H+ exchanger NHE6 in the luminal membrane domain.","date":"2017","source":"American journal of physiology. Cell physiology","url":"https://pubmed.ncbi.nlm.nih.gov/29351414","citation_count":12,"is_preprint":false},{"pmid":"27325559","id":"PMC_27325559","title":"Novel CLCN7 mutation identified in a Han Chinese family with autosomal dominant osteopetrosis-2.","date":"2016","source":"Molecular pain","url":"https://pubmed.ncbi.nlm.nih.gov/27325559","citation_count":11,"is_preprint":false},{"pmid":"20448277","id":"PMC_20448277","title":"An alternative splicing variant in Clcn7-/- mice prevents osteopetrosis but not neural and retinal degeneration.","date":"2010","source":"Veterinary pathology","url":"https://pubmed.ncbi.nlm.nih.gov/20448277","citation_count":11,"is_preprint":false},{"pmid":"22419446","id":"PMC_22419446","title":"Long-term survival in infantile malignant autosomal recessive osteopetrosis secondary to homozygous p.Arg526Gln mutation in CLCN7.","date":"2012","source":"American journal of medical genetics. Part A","url":"https://pubmed.ncbi.nlm.nih.gov/22419446","citation_count":11,"is_preprint":false},{"pmid":"19238435","id":"PMC_19238435","title":"A novel CLCN7 mutation resulting in a most severe form of autosomal recessive osteopetrosis.","date":"2009","source":"European journal of pediatrics","url":"https://pubmed.ncbi.nlm.nih.gov/19238435","citation_count":11,"is_preprint":false},{"pmid":"28339032","id":"PMC_28339032","title":"ClC-7/Ostm1 contribute to the ability of tea polyphenols to maintain bone homeostasis in C57BL/6 mice, protecting against fluorosis.","date":"2017","source":"International journal of molecular medicine","url":"https://pubmed.ncbi.nlm.nih.gov/28339032","citation_count":10,"is_preprint":false},{"pmid":"24535484","id":"PMC_24535484","title":"Identification of TCIRG1 and CLCN7 gene mutations in a patient with autosomal recessive osteopetrosis.","date":"2014","source":"Molecular medicine reports","url":"https://pubmed.ncbi.nlm.nih.gov/24535484","citation_count":9,"is_preprint":false},{"pmid":"38136669","id":"PMC_38136669","title":"Impaired Autophagic Clearance with a Gain-of-Function Variant of the Lysosomal Cl-/H+ Exchanger ClC-7.","date":"2023","source":"Biomolecules","url":"https://pubmed.ncbi.nlm.nih.gov/38136669","citation_count":9,"is_preprint":false},{"pmid":"23390581","id":"PMC_23390581","title":"An optical assay of the transport activity of ClC-7.","date":"2013","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/23390581","citation_count":9,"is_preprint":false},{"pmid":"28942122","id":"PMC_28942122","title":"Clcn7F318L/+ as a new mouse model of Albers-Schönberg disease.","date":"2017","source":"Bone","url":"https://pubmed.ncbi.nlm.nih.gov/28942122","citation_count":8,"is_preprint":false},{"pmid":"32691986","id":"PMC_32691986","title":"Transcriptome sequencing identifies a noncoding, deep intronic variant in CLCN7 causing autosomal recessive osteopetrosis.","date":"2020","source":"Molecular genetics & genomic medicine","url":"https://pubmed.ncbi.nlm.nih.gov/32691986","citation_count":8,"is_preprint":false},{"pmid":"19259722","id":"PMC_19259722","title":"Refined genomic localization of the genetic lesion in the osteopetrosis (op) rat and exclusion of three positional and functional candidate genes, Clcn7, Atp6v0c, and Slc9a3r2.","date":"2009","source":"Calcified tissue international","url":"https://pubmed.ncbi.nlm.nih.gov/19259722","citation_count":7,"is_preprint":false},{"pmid":"25410126","id":"PMC_25410126","title":"Identification of two novel mutations on CLCN7 gene in a patient with malignant ostopetrosis.","date":"2014","source":"Italian journal of pediatrics","url":"https://pubmed.ncbi.nlm.nih.gov/25410126","citation_count":7,"is_preprint":false},{"pmid":"28819563","id":"PMC_28819563","title":"Novel CLCN7 compound heterozygous mutations in intermediate autosomal recessive osteopetrosis.","date":"2017","source":"Human genome variation","url":"https://pubmed.ncbi.nlm.nih.gov/28819563","citation_count":7,"is_preprint":false},{"pmid":"28975865","id":"PMC_28975865","title":"Novel mutations of CLCN7 cause autosomal dominant osteopetrosis type II (ADOII) and intermediate autosomal recessive osteopetrosis (ARO) in seven Chinese families.","date":"2017","source":"Postgraduate medicine","url":"https://pubmed.ncbi.nlm.nih.gov/28975865","citation_count":6,"is_preprint":false},{"pmid":"38294065","id":"PMC_38294065","title":"The Cl- transporter ClC-7 is essential for phagocytic clearance by microglia.","date":"2024","source":"Journal of cell science","url":"https://pubmed.ncbi.nlm.nih.gov/38294065","citation_count":6,"is_preprint":false},{"pmid":"37937509","id":"PMC_37937509","title":"Distinct ClC-6 and ClC-7 Cl- sensitivities provide insight into ClC-7's role in lysosomal Cl- homeostasis.","date":"2023","source":"The Journal of physiology","url":"https://pubmed.ncbi.nlm.nih.gov/37937509","citation_count":6,"is_preprint":false},{"pmid":"26346547","id":"PMC_26346547","title":"Null mutation of chloride channel 7 (Clcn7) impairs dental root formation but does not affect enamel mineralization.","date":"2015","source":"Cell and tissue research","url":"https://pubmed.ncbi.nlm.nih.gov/26346547","citation_count":5,"is_preprint":false},{"pmid":"18755304","id":"PMC_18755304","title":"CLCN7 polymorphisms and bone mineral density in healthy premenopausal white women and in white men.","date":"2008","source":"Bone","url":"https://pubmed.ncbi.nlm.nih.gov/18755304","citation_count":5,"is_preprint":false},{"pmid":"30431110","id":"PMC_30431110","title":"CLCN7 and TCIRG1 mutations in a single family: Evidence for digenic inheritance of osteopetrosis.","date":"2018","source":"Molecular medicine reports","url":"https://pubmed.ncbi.nlm.nih.gov/30431110","citation_count":5,"is_preprint":false},{"pmid":"33304905","id":"PMC_33304905","title":"A Novel Variant in CLCN7 Regulates the Coupling of Angiogenesis and Osteogenesis.","date":"2020","source":"Frontiers in cell and developmental biology","url":"https://pubmed.ncbi.nlm.nih.gov/33304905","citation_count":4,"is_preprint":false},{"pmid":"33105733","id":"PMC_33105733","title":"Identification and Characterization of a Novel CLCN7 Variant Associated with Osteopetrosis.","date":"2020","source":"Genes","url":"https://pubmed.ncbi.nlm.nih.gov/33105733","citation_count":4,"is_preprint":false},{"pmid":"19904698","id":"PMC_19904698","title":"Osteopetrosis due to homozygous chloride channel ClCN7 mutation mimicking metabolic disease with haematological and neurological impairment.","date":"2009","source":"Klinische Padiatrie","url":"https://pubmed.ncbi.nlm.nih.gov/19904698","citation_count":4,"is_preprint":false},{"pmid":"30759959","id":"PMC_30759959","title":"A Case of Autosomal Dominant Osteopetrosis Type 2 with a CLCN7 Gene Mutation.","date":"2019","source":"Journal of clinical research in pediatric endocrinology","url":"https://pubmed.ncbi.nlm.nih.gov/30759959","citation_count":4,"is_preprint":false},{"pmid":"36051116","id":"PMC_36051116","title":"Autosomal dominant osteopetrosis type II resulting from a de novo mutation in the CLCN7 gene: A case report.","date":"2022","source":"World journal of clinical cases","url":"https://pubmed.ncbi.nlm.nih.gov/36051116","citation_count":3,"is_preprint":false},{"pmid":"35618777","id":"PMC_35618777","title":"A Mild Case of Autosomal Recessive Osteopetrosis Masquerading as the Dominant Form Involving Homozygous Deep Intronic Variations in the CLCN7 Gene.","date":"2022","source":"Calcified tissue international","url":"https://pubmed.ncbi.nlm.nih.gov/35618777","citation_count":3,"is_preprint":false},{"pmid":"37168803","id":"PMC_37168803","title":"A novel compound heterozygous mutation of the CLCN7 gene is associated with autosomal recessive osteopetrosis.","date":"2023","source":"Frontiers in pediatrics","url":"https://pubmed.ncbi.nlm.nih.gov/37168803","citation_count":2,"is_preprint":false},{"pmid":"38733412","id":"PMC_38733412","title":"Effect of Allele-Specific Clcn7G213R siRNA Delivered Via a Novel Nanocarrier on Bone Phenotypes in ADO2 Mice on 129S Background.","date":"2024","source":"Calcified tissue international","url":"https://pubmed.ncbi.nlm.nih.gov/38733412","citation_count":2,"is_preprint":false},{"pmid":"29926385","id":"PMC_29926385","title":"Whole exome sequencing identified two novel homozygous missense variants in the same codon of CLCN7 underlying autosomal recessive infantile malignant osteopetrosis in a Pakistani family.","date":"2018","source":"Molecular biology reports","url":"https://pubmed.ncbi.nlm.nih.gov/29926385","citation_count":2,"is_preprint":false},{"pmid":"40018371","id":"PMC_40018371","title":"Metabolomics study of osteopetrosis caused by CLCN7 mutation reveals novel pathway and potential biomarkers.","date":"2025","source":"Frontiers in endocrinology","url":"https://pubmed.ncbi.nlm.nih.gov/40018371","citation_count":1,"is_preprint":false},{"pmid":"40276109","id":"PMC_40276109","title":"Identification of a novel mutation in the CLCN7 gene in pediatric osteopetrosis: case report.","date":"2025","source":"Frontiers in pediatrics","url":"https://pubmed.ncbi.nlm.nih.gov/40276109","citation_count":1,"is_preprint":false},{"pmid":"39056574","id":"PMC_39056574","title":"Multisystem disorder associated with a pathogenic variant in CLCN7 in the absence of osteopetrosis.","date":"2024","source":"Molecular genetics & genomic medicine","url":"https://pubmed.ncbi.nlm.nih.gov/39056574","citation_count":1,"is_preprint":false},{"pmid":"39359949","id":"PMC_39359949","title":"A 37-kb Deletion in Region 16p13.3 in an Infant with Osteopetrosis and Congenital Diarrhea Including the CLCN7 and PERCC1 Genes.","date":"2024","source":"Molecular syndromology","url":"https://pubmed.ncbi.nlm.nih.gov/39359949","citation_count":1,"is_preprint":false},{"pmid":"30229577","id":"PMC_30229577","title":"Genetic Analysis of CLCN7 in an Old Female Patient with Type II Autosomal Dominant Osteopetrosis.","date":"2018","source":"Endocrinology and metabolism (Seoul, Korea)","url":"https://pubmed.ncbi.nlm.nih.gov/30229577","citation_count":1,"is_preprint":false},{"pmid":"33651788","id":"PMC_33651788","title":"Hematopoietic stem cell transplantation in a patient with osteopetrosis and mutation in CLCN7: long-term follow-up.","date":"2021","source":"Boletin medico del Hospital Infantil de Mexico","url":"https://pubmed.ncbi.nlm.nih.gov/33651788","citation_count":1,"is_preprint":false},{"pmid":"41408708","id":"PMC_41408708","title":"The molecular and functional interplay between the osteopetrosis-associated proteins SNX10, OSTM1, and CLC-7 during mouse osteoclastogenesis.","date":"2025","source":"Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research","url":"https://pubmed.ncbi.nlm.nih.gov/41408708","citation_count":0,"is_preprint":false},{"pmid":"41674487","id":"PMC_41674487","title":"CLC-7 Chloride Channels Affects rAAV Trafficking in Cells by Regulating Protease Activity in Lysosomes.","date":"2026","source":"Journal of medical virology","url":"https://pubmed.ncbi.nlm.nih.gov/41674487","citation_count":0,"is_preprint":false},{"pmid":"41466453","id":"PMC_41466453","title":"Primate-specific sperm lnc-CLCN7 reveals embryo quality in IVF.","date":"2025","source":"Acta biochimica et biophysica Sinica","url":"https://pubmed.ncbi.nlm.nih.gov/41466453","citation_count":0,"is_preprint":false},{"pmid":"41421595","id":"PMC_41421595","title":"Novel de novo CLCN7 mutation in refractory osteopetrosis-related osteomyelitis: A case report and multidisciplinary therapeutic dilemmas.","date":"2025","source":"Journal of stomatology, oral and maxillofacial surgery","url":"https://pubmed.ncbi.nlm.nih.gov/41421595","citation_count":0,"is_preprint":false},{"pmid":"21946807","id":"PMC_21946807","title":"A newly described mutation of the CLCN7 gene causes neuropathic autosomal recessive osteopetrosis in an Arab family.","date":"2012","source":"Clinical dysmorphology","url":"https://pubmed.ncbi.nlm.nih.gov/21946807","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2025.10.01.679551","title":"Mechanism of phosphoinositide regulation of lysosomal pH via inhibition of CLC-7","date":"2025-10-02","source":"bioRxiv","url":"https://doi.org/10.1101/2025.10.01.679551","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.03.31.646258","title":"The molecular and cellular interplay between the osteopetrosis-associated proteins SNX10, OSTM1, and CLC-7 during osteoclastogenesis","date":"2025-03-31","source":"bioRxiv","url":"https://doi.org/10.1101/2025.03.31.646258","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":53071,"output_tokens":6932,"usd":0.131597,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":16071,"output_tokens":4124,"usd":0.091728,"stage2_stop_reason":"end_turn"},"total_usd":0.223325,"stage1_batch_id":"msgbatch_01ACAxJQabDsht39JXeWG22d","stage2_batch_id":"msgbatch_01QEU22A9U5sbPTgsMzTmvSf","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2008,\n      \"finding\": \"ClC-7 is a Cl-/H+ antiporter that constitutes the primary (predominant) Cl- permeability of the lysosomal membrane. siRNA knockdown of ClC-7 essentially ablates lysosomal Cl-/H+ antiport activity and strongly diminishes the ability of lysosomes to acidify in vivo, demonstrating ClC-7's essential role in lysosomal acidification.\",\n      \"method\": \"Direct electrophysiological measurement of anion transport in isolated lysosomes; siRNA knockdown with functional readout of Cl-/H+ antiport activity and lysosomal acidification\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct in vitro reconstitution/electrophysiology of lysosomal transport combined with siRNA knockdown and functional acidification assay; replicated by multiple subsequent studies\",\n      \"pmids\": [\"18449189\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"ClC-7 requires Ostm1 as an obligate β-subunit. The two proteins co-localize in late endosomes/lysosomes and the ruffled border of osteoclasts, form a molecular complex by co-immunoprecipitation, and Ostm1 stabilizes ClC-7 protein (ClC-7 protein levels fall below 10% in Ostm1-deficient tissues). ClC-7 is required for Ostm1 to reach lysosomes, where the highly glycosylated Ostm1 luminal domain is then cleaved.\",\n      \"method\": \"Co-immunoprecipitation, co-localization by immunofluorescence, protein-level analysis in grey-lethal (Ostm1-deficient) mice, subcellular fractionation\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, co-localization, genetic mouse model with protein-level quantification; independently confirmed by cryo-EM structural studies\",\n      \"pmids\": [\"16525474\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Cryo-EM structures of CLC-7 alone and in complex with OSTM1 resolved to 2.8 Å reveal that the luminal surface of CLC-7 is entirely covered by a dimer of heavily glycosylated, disulfide-bonded OSTM1, which protects CLC-7 from the degradative lysosomal lumen. OSTM1 binding does not induce large-scale rearrangements of CLC-7 but has minor effects on the ion-conduction pathway conformation.\",\n      \"method\": \"Cryo-electron microscopy structure determination\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — high-resolution cryo-EM structure with two independent structural studies (Schrecker et al. and Zhang et al., both 2020) providing orthogonal validation\",\n      \"pmids\": [\"32749217\", \"32851177\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Cryo-EM structure of human CLC-7/Ostm1 shows that the glycosylated Ostm1 acts as a lid positioned above CLC-7 and interacts extensively with CLC-7 within the membrane. Structural and electrophysiology analyses indicate that domain interaction interfaces between the N-terminus, transmembrane domain (TMD), and CBS domains of CLC-7 affect its slow gating kinetics.\",\n      \"method\": \"Cryo-EM structure determination; electrophysiology\",\n      \"journal\": \"Science advances\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — cryo-EM plus functional electrophysiology in a single study, corroborated by independent contemporaneous structure\",\n      \"pmids\": [\"32851177\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"ClC-7 knockout mice develop lysosomal storage disease and neurodegeneration (accumulation of electron-dense material, autofluorescent structures, subunit c of mitochondrial ATP synthase, microglial activation, astrogliosis) despite unchanged lysosomal pH in cultured neurons, demonstrating a role for ClC-7 in lysosomal function independent of gross pH change in neurons. Rescuing the bone phenotype by osteoclast-specific transgenic expression revealed progressive CNS pathology, showing cell-autonomous neurodegeneration.\",\n      \"method\": \"Clcn7 knockout mouse model; histology; electron microscopy; transgenic rescue; immunohistochemistry\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — well-characterized knockout mouse with multiple phenotypic readouts and genetic rescue experiment; independently replicated\",\n      \"pmids\": [\"15706348\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"ClC-7 is required for lysosomal protein degradation in a cell-autonomous manner. In renal proximal tubular cells lacking ClC-7 (tissue-specific knockout), endocytosed protein half-life increased significantly compared to ClC-7-expressing cells, while endocytosis rates were similar, demonstrating that ClC-7 is specifically required for the degradation step.\",\n      \"method\": \"Tissue-specific Clcn7 knockout mice; in vivo pulse-chase endocytosis experiments; comparison of endocytosed protein half-life between ClC-7-expressing and ClC-7-deficient cells\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo chimeric knockout with direct pulse-chase comparison, multiple tissue types examined, cell-autonomous effect confirmed\",\n      \"pmids\": [\"19661288\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Slow voltage-dependent activation of ClC-7/Ostm1 operates through a common gate acting on both subunits of the dimer simultaneously (not through independent protopore gates). CBS domain-containing C-terminus is required for this common gating and does not need to be covalently attached to the membrane domain of ClC-7.\",\n      \"method\": \"Electrophysiology of plasma-membrane-targeted ClC-7/Ostm1; co-expression of transport-deficient and accelerating mutant subunits; truncation and domain swap experiments\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multiple mutant combinations tested by electrophysiology with rigorous mechanistic interpretation; mechanistically definitive within single study\",\n      \"pmids\": [\"23983121\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"PI(3,5)P2 directly inhibits ClC-7 Cl-/H+ transport. Depletion of PI(3,5)P2 by PIKfyve kinase inhibition causes lysosomal hyperacidification primarily via an effect on ClC-7. A disease-causing gain-of-function ClC-7 mutation eliminates PI(3,5)P2 inhibition, linking this regulatory mechanism to disease pathogenesis.\",\n      \"method\": \"PIKfyve inhibition; direct transport assay of ClC-7; gain-of-function mutant analysis; lysosomal pH measurements\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct lipid inhibition demonstrated with transport assays, genetic gain-of-function mutation corroborates mechanism, multiple orthogonal approaches\",\n      \"pmids\": [\"35670560\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"PI(3,5)P2 binding to ClC-7 dramatically remodels ClC-7 structure by inducing close association between cytosolic and transmembrane domains. Disease-causing gain-of-function mutations show increased transport activity through loss of PI(3,5)P2 binding. ClC-7 activation correlates with dissociation and increased disorder of the cytoplasmic domain and novel transmembrane domain conformations, revealing the molecular basis of the ClC-7 slow gate regulation by PI(3,5)P2.\",\n      \"method\": \"Cryo-EM structural analysis; functional transport assays; computational/molecular dynamics analysis; mutagenesis of PI(3,5)P2-binding site\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — cryo-EM structure plus functional and computational analysis in one study; preprint not yet peer-reviewed but mechanistically rigorous\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Both ClC-7 ion transport activity and ClC-7 protein presence (independent of ion transport) are required for different cellular functions. Converting ClC-7 into a Cl- conductance (Clcn7unc/unc) causes lysosomal storage but less severe osteopetrosis; transport-deficient ClC-7 (Clcn7td/td) causes severe osteopetrosis comparable to knockout, but normal coat color and less severe neurodegeneration, indicating that protein-protein interactions (not ion transport) mediate pigmentation, while ion transport is critical for osteopetrosis and lysosomal function.\",\n      \"method\": \"In vivo structure-function analysis using Clcn7unc/unc (conductance-converted) and Clcn7td/td (transport-deficient) knock-in mice; phenotypic comparison with Clcn7-/- mice\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — three distinct mouse models with orthogonal genetic perturbations, multiple phenotypic readouts, rigorous in vivo structure-function dissection\",\n      \"pmids\": [\"24820037\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Microphthalmia transcription factor (MITF) directly binds to two M-box elements in the Clcn7 promoter and one M-box in the Ostm1 promoter, co-regulating their expression during osteoclastogenesis. MITF transactivates the Clcn7 promoter, and mutation of one M-box abolishes this transactivation. Clcn7 expression is repressed in mi/mi dominant-negative MITF mice.\",\n      \"method\": \"EMSA; reporter gene assay; chromatin immunoprecipitation; MITF overexpression microarray; analysis of mi/mi mutant mice\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (EMSA, ChIP, reporter assay, in vivo mutant) in a single study establishing direct transcriptional regulation\",\n      \"pmids\": [\"17105730\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"In primary microglia, ClC-7 is not efficiently delivered to lysosomes (it is mistargeted and degraded by ER-associated degradation), causing incomplete lysosomal acidification and impaired degradation of fibrillar amyloid-β. Macrophage colony-stimulating factor (M-CSF) activation induces trafficking of ClC-7 to lysosomes, restoring acidification and fAβ degradation. ClC-7 association with Ostm1 is important for correct lysosomal targeting in microglia.\",\n      \"method\": \"Primary microglia culture; ClC-7 localization by immunofluorescence; lysosomal pH measurement; fAβ degradation assay; M-CSF activation; Ostm1 co-expression\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple functional assays in primary cells but single lab, mechanistic link between mistargeting and lysosomal function established\",\n      \"pmids\": [\"21441306\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"The G215R mutation in ClC-7 (causing autosomal dominant osteopetrosis type II) does not abolish Cl-/H+ antiport function but causes a severe trafficking defect, preventing the transporter from reaching the lysosomal membrane in CHO cells. This suggests mislocalization rather than loss of catalytic activity is the primary pathogenic mechanism for G215R.\",\n      \"method\": \"Solid-supported membrane-based electrophysiology; subcellular localization in CHO cells expressing wild-type vs. G213R rat ClC-7\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — electrophysiology plus localization in a heterologous cell model, single lab but two orthogonal methods\",\n      \"pmids\": [\"20830208\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"A Y750Q missense mutation in the CBS2 domain of ClC-7 in Belgian Blue cattle drastically accelerates voltage-dependent gating of ClC-7/Ostm1 while largely preserving lysosomal localization and assembly, providing direct evidence that accelerated ClC-7/Ostm1 gating per se (independent of mislocalization) is sufficient to cause osteopetrosis and lysosomal storage disease.\",\n      \"method\": \"Autozygosity mapping; genome sequencing; electrophysiology of mutant ClC-7/Ostm1; immunolocalization; clinical/histological phenotyping\",\n      \"journal\": \"Disease models & mechanisms\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — electrophysiology and localization analysis of disease mutant in a natural animal model, single study\",\n      \"pmids\": [\"24159188\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Wild-type ClC-7 displays large transient capacitive currents that depend on external pH and internal (but not external) Cl-. The proton glutamate mutant E312A strongly reduces but does not abolish stationary transport currents (unlike in other mammalian CLC transporters), suggesting that an alternative proton transfer pathway exists in ClC-7.\",\n      \"method\": \"Electrophysiology (patch clamp) of plasma membrane-targeted wild-type and E312A mutant ClC-7; analysis of transient capacitive currents and stationary transport currents\",\n      \"journal\": \"The Journal of general physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — rigorous in vitro electrophysiology with mutagenesis, single lab\",\n      \"pmids\": [\"33211806\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Gain-of-function CLCN7 mutations (p.Tyr715Cys and p.Lys285Thr) causing HOD syndrome (hypopigmentation, organomegaly, delayed myelination) decrease ClC-7 inhibition by PI(3,5)P2, affect residues lining its binding pocket, shift voltage-dependent gating to less positive potentials (an effect partially transferred to WT subunits in heteromers), and induce large lysosomal vacuoles. The vacuole formation requires Cl-/H+ exchange activity as shown by uncoupling mutations. Fibroblasts from p.Y715C patient display giant vacuoles.\",\n      \"method\": \"Electrophysiology; mutagenesis (uncoupling mutations); PI(3,5)P2 binding analysis; patient fibroblast imaging; vacuole formation assay in transfected cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multiple orthogonal methods (electrophysiology, mutagenesis, patient cell validation, lipid binding assay) in single rigorous study\",\n      \"pmids\": [\"38838776\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"ClC-7 gain-of-function mutation (Y715C) causes enlarged lysosomal vacuoles through increased Cl-/H+ exchange activity leading to membrane fusion; degradation of endocytosed material is reduced in these compartments; autophagic clearance is largely impaired resulting in accumulation of autophagic material. The vacuole enlargement requires Cl-/H+ exchange (demonstrated by uncoupling mutations that abrogate it).\",\n      \"method\": \"Transfection of mutant ClC-7 in cells; combination with uncoupling or current-reducing mutations; lysosomal morphology analysis; autophagic flux assay; endocytosis/degradation assays\",\n      \"journal\": \"Biomolecules\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal approaches in transfected cell system, single lab, mechanistically informative structure-function dissection\",\n      \"pmids\": [\"38136669\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"ClC-7 transport activity is inhibited by low luminal (extracellular in the assay) Cl- concentration, in contrast to ClC-6 which is activated by high luminal Cl-. This distinctive Cl- sensitivity of ClC-7/Ostm1 is proposed to serve as a feedback mechanism limiting excessive intraluminal Cl- accumulation in lysosomes. An osteopetrosis mutant (R762Q) with fast gating kinetics shows altered (reduced) Cl- sensitivity, identifying altered Cl- sensitivity as a plausible disease mechanism.\",\n      \"method\": \"Electrophysiology of plasma membrane-targeted ClC-7/Ostm1 and ClC-6 with varying extracellular Cl- concentrations; disease mutant analysis\",\n      \"journal\": \"The Journal of physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — rigorous electrophysiology with multiple conditions and disease variants, single lab\",\n      \"pmids\": [\"37937509\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Genetic knockout of CLCN7 corrects lysosomal swelling and partially corrects lysosomal hyperacidification in FIG4-null cells, placing ClC-7 downstream of PI(3,5)P2 signaling in lysosomal homeostasis. Knockout of the related transporter CLCN6 in FIG4-null cells had no effect on the lysosome phenotype, demonstrating specificity of CLCN7 in this pathway.\",\n      \"method\": \"Genetic epistasis: CLCN7 and CLCN6 knockout in FIG4-null cell cultures; lysosomal size and pH measurements; in vivo mouse model with dominant-negative CLCN7\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis with specificity controls (CLCN6 negative result), in vitro and in vivo confirmation, single lab\",\n      \"pmids\": [\"37363915\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"In PSEN1-deficient cells, ClC-7 delivery from the ER to lysosomes is impaired, reducing lysosomal Cl- content. PKA-mediated (β2-adrenergic agonist-stimulated) facilitation of ClC-7 delivery to lysosomes restores lysosomal Cl-, acidification, proteolysis, calcium homeostasis, and autophagic flux. This identifies a β2-adrenergic/PKA → ClC-7 lysosomal trafficking axis as a mechanism for lysosomal pH regulation.\",\n      \"method\": \"β2-adrenergic agonist treatment; PKA pathway analysis; ClC-7 subcellular localization by imaging; lysosomal pH, Cl- content, proteolysis, and autophagic flux assays in PSEN1 KO cells and patient fibroblasts; transcriptomics\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple functional assays in disease-relevant cells, novel mechanism with pharmacological and genetic support, single lab\",\n      \"pmids\": [\"32105735\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"ClC-7 is expressed in the luminal (apical) membrane domain of choroid plexus epithelial cells, where it is proposed to contribute to CSF pH regulation via Cl-/H+ exchange. Cl- gradient-driven changes in intracellular pH and membrane potential consistent with Cl-/H+ exchange were demonstrated by dynamic imaging.\",\n      \"method\": \"Mass spectrometry proteomics of FACS-isolated choroid plexus epithelial cells; RT-PCR; immunolocalization; dynamic intracellular pH and membrane potential imaging\",\n      \"journal\": \"American journal of physiology. Cell physiology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — localization established by immunostaining plus indirect functional evidence from pH imaging, but ClC-7 specifically not isolated as the responsible transporter; single lab\",\n      \"pmids\": [\"29351414\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"SNX10 physically interacts with CLC-7 (demonstrated by co-immunoprecipitation). CLC-7 is required for transport of OSTM1-containing lysosomes to the cell periphery in osteoclasts. Loss of CLC-7 depletes peripheral OSTM1-containing lysosomes, establishing a functional link between SNX10, CLC-7, and OSTM1 in regulating lysosome subcellular distribution and osteoclast fusion/function.\",\n      \"method\": \"Co-immunoprecipitation; immunofluorescence co-localization; analysis of CLC-7-KO osteoclasts for peripheral lysosome distribution; comparison with SNX10-KO and OSTM1-KO phenotypes\",\n      \"journal\": \"Journal of bone and mineral research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP plus localization in KO cells, multiple KO models compared, single lab\",\n      \"pmids\": [\"41408708\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"ClC-7 is essential for phagocytic clearance by microglia in vivo. In zebrafish clcn7 mutants, microglia and embryonic macrophages cannot effectively process apoptotic cells or β-amyloid. Despite these functional defects, microglia develop normally and express normal endosomal/lysosomal markers. The ostm1 (β-subunit) mutant displays a strikingly similar phenotype, consistent with ClC-7/Ostm1 complex being required for microglial lysosomal function.\",\n      \"method\": \"Zebrafish clcn7 and ostm1 mutant analysis; in vivo phagocytosis assays; microglial development and marker expression analysis\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo loss-of-function in zebrafish with specific functional readouts, corroborated by ostm1 mutant phenocopy, single lab\",\n      \"pmids\": [\"38294065\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"CLC-7 depletion (siRNA knockdown or pharmacological inhibition) enhances rAAV transduction efficiency by altering lysosomal chloride homeostasis, selectively reducing the catalytic activity of cathepsins B and L (Cl--dependent) without affecting cathepsin D (Cl--independent), thereby delaying rAAV capsid degradation and facilitating lysosomal escape.\",\n      \"method\": \"siRNA knockdown; pharmacological inhibition of CLC-7; cathepsin activity assays; rAAV transduction efficiency measurement in vitro and in vivo mouse model\",\n      \"journal\": \"Journal of medical virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mechanistic link between CLC-7 activity, lysosomal Cl- homeostasis, and specific cathepsin activity established using pharmacological and genetic tools, single lab\",\n      \"pmids\": [\"41674487\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"ClC-7 (89 kDa) and ClC-6 (97 kDa) define a new branch of the CLC chloride channel family; ClC-7 is located on human chromosome 16p13. ClC-7 is the only known eukaryotic CLC protein lacking the conserved glycosylation site between transmembrane domains D8 and D9. Neither ClC-6 nor ClC-7 expressed functional chloride channels in Xenopus oocytes when expressed alone or in combination.\",\n      \"method\": \"Molecular cloning; heterologous expression in Xenopus oocytes; sequence/hydropathy analysis; chromosomal mapping\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Strong — cloning and expression study with multiple characterization approaches; negative functional result (no oocyte currents) subsequently explained by absence of Ostm1 β-subunit\",\n      \"pmids\": [\"8543009\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CLC-7 (CLCN7) is a lysosomal 2Cl-/1H+ antiporter that, in obligate complex with its β-subunit OSTM1 (which covers the luminal face of CLC-7 and stabilizes it), constitutes the primary chloride permeability of the lysosomal membrane; it is slowly activated by membrane depolarization via a common gate that depends on the CBS-domain-containing C-terminus, is tonically inhibited by the signaling lipid PI(3,5)P2 through a mechanism that remodels the cytosolic-transmembrane domain interface, and is essential for lysosomal ion homeostasis, protein degradation, lysosomal acidification, and osteoclast ruffled-border acidification required for bone resorption, with its transcription co-regulated by the MITF transcription factor in osteoclasts and its subcellular trafficking to lysosomes modulated by SNX10 and β2-adrenergic/PKA signaling.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CLCN7 (CLC-7) is a lysosomal 2Cl-/1H+ antiporter that provides the predominant chloride permeability of the lysosomal membrane and is essential for lysosomal ion homeostasis, acidification, and protein degradation [#0, #5]. It functions in obligate complex with the β-subunit OSTM1: the two proteins co-localize in late endosomes/lysosomes, OSTM1 stabilizes CLC-7 protein, and CLC-7 in turn delivers OSTM1 to lysosomes [#1]; cryo-EM structures show a glycosylated, disulfide-bonded OSTM1 dimer forming a lid that covers the luminal surface of CLC-7 and shields it from luminal degradation while interacting extensively within the membrane [#2, #3]. Transport is governed by a slow common gate that acts on both protomers of the dimer simultaneously and depends on the CBS-domain-containing cytosolic C-terminus [#6], which is tonically inhibited by the signaling lipid PI(3,5)P2 through a conformational remodeling that draws the cytosolic and transmembrane domains together [#7, #8]. Beyond its catalytic activity, CLC-7 protein has transport-independent roles: in vivo structure-function dissection separates ion transport (critical for osteopetrosis and lysosomal storage) from protein-protein interactions that mediate pigmentation [#9]. CLC-7 is required cell-autonomously for lysosomal protein degradation and its loss produces lysosomal storage and neurodegeneration [#4, #5], for microglial phagocytic clearance of apoptotic cells and amyloid-β [#22], and for osteoclast ruffled-border function, with its transcription directly co-regulated with OSTM1 by the MITF transcription factor during osteoclastogenesis [#10]. Gain-of-function CLCN7 mutations that lose PI(3,5)P2 inhibition cause HOD syndrome and giant lysosomal vacuoles through excessive Cl-/H+ exchange [#15], while trafficking-defective and gating-accelerating mutations cause autosomal dominant osteopetrosis [#12, #13].\",\n  \"teleology\": [\n    {\n      \"year\": 1995,\n      \"claim\": \"Established CLC-7 as a distinct branch of the CLC chloride transporter family, but its function was unknown because it produced no currents when expressed alone.\",\n      \"evidence\": \"Molecular cloning, heterologous expression in Xenopus oocytes, chromosomal mapping to 16p13\",\n      \"pmids\": [\"8543009\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No functional activity detected in isolation\", \"Requirement for an accessory subunit not yet recognized\", \"Subcellular localization unresolved\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Defined CLC-7 as essential for lysosomal function in vivo, revealing lysosomal storage and cell-autonomous neurodegeneration distinct from gross pH change.\",\n      \"evidence\": \"Clcn7 knockout mouse with histology, EM, and osteoclast-specific transgenic rescue\",\n      \"pmids\": [\"15706348\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular transport mechanism not defined\", \"Reason for normal neuronal lysosomal pH despite storage unexplained\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Identified OSTM1 as the obligate β-subunit that stabilizes CLC-7 and showed reciprocal trafficking dependence, explaining the earlier null oocyte result.\",\n      \"evidence\": \"Reciprocal Co-IP, immunofluorescence co-localization, protein quantification in grey-lethal mice\",\n      \"pmids\": [\"16525474\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of stabilization unknown\", \"Mechanism of luminal OSTM1 cleavage not resolved\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Connected CLC-7 expression to osteoclast biology by establishing MITF as a direct transcriptional regulator of both Clcn7 and Ostm1.\",\n      \"evidence\": \"EMSA, ChIP, reporter assays, MITF microarray, and mi/mi mutant mice\",\n      \"pmids\": [\"17105730\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Co-regulatory inputs beyond MITF not mapped\", \"Regulation in non-osteoclast tissues unaddressed\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Directly demonstrated CLC-7 as the predominant lysosomal Cl-/H+ antiporter required for lysosomal acidification.\",\n      \"evidence\": \"Electrophysiology of isolated lysosomes plus siRNA knockdown with acidification readout\",\n      \"pmids\": [\"18449189\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Gating regulation not yet characterized\", \"Coupling stoichiometry not defined here\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Pinpointed CLC-7 to the degradation step of endocytosed protein, showing the defect is cell-autonomous and not at the endocytosis stage.\",\n      \"evidence\": \"Tissue-specific Clcn7 knockout with in vivo pulse-chase of endocytosed protein\",\n      \"pmids\": [\"19661288\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Link between Cl- transport and proteolytic enzyme activity not yet mechanistically defined\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Resolved the gating architecture, showing slow activation is a common gate on the dimer requiring the CBS-containing C-terminus, which need not be covalently attached.\",\n      \"evidence\": \"Electrophysiology of plasma-membrane-targeted CLC-7/Ostm1 with mutant co-expression and domain swaps\",\n      \"pmids\": [\"23983121\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological signal controlling the gate not yet identified\", \"Structural conformations of gating states unresolved\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Provided the structural basis of the complex, showing the OSTM1 dimer as a protective luminal lid and identifying domain interfaces that tune slow gating.\",\n      \"evidence\": \"Cryo-EM of CLC-7 and CLC-7/OSTM1 with accompanying electrophysiology\",\n      \"pmids\": [\"32749217\", \"32851177\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Conformational dynamics during gating not captured by static structures\", \"Regulatory ligand binding sites not yet localized\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Separated transport-dependent from transport-independent functions of CLC-7 using engineered knock-in mice, showing pigmentation depends on protein interaction while osteopetrosis depends on ion transport.\",\n      \"evidence\": \"Clcn7unc/unc and Clcn7td/td knock-in mice compared to knockout, multiple phenotypic readouts\",\n      \"pmids\": [\"24820037\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of transport-independent interaction partners for pigmentation not established\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Identified PI(3,5)P2 as a direct tonic inhibitor of CLC-7 transport and linked loss of this regulation to gain-of-function disease.\",\n      \"evidence\": \"PIKfyve inhibition, direct transport assay, gain-of-function mutant, lysosomal pH measurement\",\n      \"pmids\": [\"35670560\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural mechanism of lipid inhibition not yet resolved at this stage\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Established the structural mechanism of PI(3,5)P2 regulation, showing lipid binding remodels the cytosolic-transmembrane interface to control the slow gate.\",\n      \"evidence\": \"Cryo-EM, functional transport assays, molecular dynamics, and PI(3,5)P2-site mutagenesis (preprint)\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Preprint not yet peer-reviewed\", \"Kinetics of lipid-induced conformational transitions not fully resolved\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Connected CLC-7 gain-of-function to human HOD syndrome, demonstrating reduced PI(3,5)P2 inhibition, shifted gating, and Cl-/H+-exchange-dependent vacuole formation.\",\n      \"evidence\": \"Electrophysiology, uncoupling mutagenesis, PI(3,5)P2 binding analysis, patient fibroblast imaging\",\n      \"pmids\": [\"38838776\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Tissue-specific basis of hypopigmentation, organomegaly, and delayed myelination not dissected\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Placed CLC-7 in a trafficking and lysosome-distribution network in osteoclasts via physical interaction with SNX10 and control of peripheral OSTM1-lysosome positioning.\",\n      \"evidence\": \"Co-IP, co-localization, and comparison of CLC-7-KO, SNX10-KO, and OSTM1-KO osteoclast phenotypes\",\n      \"pmids\": [\"41408708\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct SNX10–CLC-7 interface unmapped\", \"Whether SNX10 regulates CLC-7 transport activity unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How CLC-7/OSTM1 gating signals, lipid regulation, and trafficking inputs are integrated to set lysosomal Cl- and pH across different cell types remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Physiological trigger of slow gating in vivo not identified\", \"Cell-type-specific trafficking determinants incompletely defined\", \"Quantitative model linking Cl- transport to cathepsin/proteolytic output lacking\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005215\", \"supporting_discovery_ids\": [0, 6, 14, 17]},\n      {\"term_id\": \"GO:0140104\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [7, 8, 15, 17]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [7, 8, 15]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005764\", \"supporting_discovery_ids\": [0, 1, 4, 5]},\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [1]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-382551\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [5]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [16, 20]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [10]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [10]}\n    ],\n    \"complexes\": [\"CLC-7/OSTM1 antiporter complex\"],\n    \"partners\": [\"OSTM1\", \"SNX10\", \"MITF\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}