{"gene":"CLIC1","run_date":"2026-06-09T22:57:18","timeline":{"discoveries":[{"year":2001,"finding":"Crystal structure of soluble CLIC1 (NCC27) determined at 1.4-Å resolution, showing the protein is monomeric and structurally homologous to the glutathione S-transferase superfamily with a redox-active site resembling glutaredoxin. Glutathione was shown to occupy the redox-active site. The N-domain (residues 1–90) was identified as the putative transmembrane region requiring major structural rearrangement for membrane integration.","method":"X-ray crystallography at 1.4-Å resolution; complex with glutathione","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — high-resolution crystal structure with ligand-bound complex, foundational structural paper replicated by subsequent studies","pmids":["11551966"],"is_preprint":false},{"year":2002,"finding":"Soluble CLIC1 spontaneously inserts into preformed phospholipid membranes from aqueous solution (without detergent) to function as an anion-selective channel. Channel activity is inhibited by IAA-94, N-ethylmaleimide, and glutathione, is heat-inactivated, and depends on pH and lipid composition.","method":"Chloride efflux assay with lipid vesicles; planar lipid bilayer electrophysiology; purified recombinant protein","journal":"American journal of physiology. Cell physiology","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstitution in vitro with two orthogonal methods (vesicle efflux + bilayer), replicated by other groups","pmids":["11940526"],"is_preprint":false},{"year":2002,"finding":"Recombinant CLIC1 integrates into artificial lipid bilayers via a pH-dependent two-state process, forming chloride-selective channels with conductance, pharmacology, and kinetics identical to those in CLIC1-transfected CHO cells. The assembly transitions from small-conductance slow-kinetics modules to a high-conductance fast-kinetics channel consistent with a tetrameric assembly.","method":"Planar lipid bilayer electrophysiology; comparison with patch-clamp recordings in transfected CHO cells","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstitution in vitro replicated in cell-based recordings, multiple electrophysiological parameters compared","pmids":["11978800"],"is_preprint":false},{"year":2003,"finding":"On oxidation, CLIC1 undergoes a reversible transition from a monomeric to a non-covalent dimeric state via formation of an intramolecular disulfide bond between Cys-24 and Cys-59. The crystal structure of the oxidized dimer reveals a major structural transition exposing a large hydrophobic surface that forms the dimer interface. The oxidized dimer retains the ability to form chloride channels in bilayers/vesicles, whereas reducing conditions prevent channel formation. Mutagenesis showed both Cys-24 and Cys-59 are required for channel activity.","method":"X-ray crystallography of oxidized CLIC1; site-directed mutagenesis; artificial bilayer and vesicle electrophysiology","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure plus mutagenesis plus functional reconstitution in a single study","pmids":["14613939"],"is_preprint":false},{"year":2000,"finding":"NCC27 (CLIC1) chloride conductance is selectively expressed on the plasma membrane of CHO-K1 cells in G2/M phase of the cell cycle. Chloride channel blockers that block NCC27 arrest CHO-K1 cells in G2/M, supporting a role for NCC27 in cell cycle regulation.","method":"Electrophysiology across cell cycle stages; pharmacological chloride channel blockade with cell cycle analysis","journal":"The Journal of physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — electrophysiology combined with pharmacological cell cycle arrest, single lab, two orthogonal readouts","pmids":["11195932"],"is_preprint":false},{"year":2000,"finding":"NCC27/CLIC1 is a transmembrane protein that directly forms part of the ion channel. The amino terminus projects to the extracellular/luminal side and the carboxyl terminus projects intracellularly. Selective antibody blockade of the epitope tag confirmed N-terminal topology. Chloride conductance is essentially identical on plasma and nuclear membranes.","method":"Electrophysiology of epitope-tagged NCC27 in transfected CHO-K1 cells; antibody inhibition from defined membrane sides; patch clamp","journal":"FASEB journal","confidence":"High","confidence_rationale":"Tier 1 / Moderate — direct functional mutagenesis/topology experiment with antibody occlusion and dual-side recordings in a single study","pmids":["10834939"],"is_preprint":false},{"year":2004,"finding":"Beta-amyloid (Aβ) stimulation of rat microglia specifically increases CLIC1 protein expression and functional CLIC1 chloride conductance on the plasma membrane. Knockdown of CLIC1 by siRNA prevents Aβ-induced TNF-α release. Pharmacological blockade of CLIC1 (IAA-94) prevents neuronal apoptosis in neurons co-cultured with Aβ-treated microglia.","method":"siRNA knockdown; pharmacological inhibition; electrophysiology; neurotoxicity co-culture assay","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — two orthogonal loss-of-function approaches (siRNA + pharmacology) with specific phenotypic readouts, replicated by subsequent studies","pmids":["15190104"],"is_preprint":false},{"year":2008,"finding":"Aβ promotes acute translocation of CLIC1 from cytosol to the plasma membrane of microglia, where it mediates a chloride conductance required for NADPH oxidase-dependent ROS generation. CLIC1 activation is itself dependent on oxidation by NADPH oxidase-derived ROS, establishing a feedforward mechanism. Blockade by anti-CLIC1 antibody, impermeant anion substitution, or siRNA all prevented Aβ-induced ROS generation.","method":"Live-cell imaging of CLIC1 translocation; siRNA knockdown; antibody inhibition; anion substitution; ROS assay","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal interventions (siRNA, antibody, pharmacology, anion substitution) converging on a defined feedforward mechanism","pmids":["18987185"],"is_preprint":false},{"year":2005,"finding":"Cysteine 24 (in a cysteine-proline motif) is a critical redox-sensitive residue located on the extracellular/luminal side of membrane CLIC1 subunits near the putative channel pore. Under oxidizing conditions on the extracellular side, single-channel current amplitudes are minimized. Site-directed mutagenesis and covalent modification support an intersubunit disulfide bond mechanism for channel regulation.","method":"Planar lipid bilayer single-channel recording; site-directed mutagenesis (C24 and related residues); covalent functional modification; anti-CLIC1 antibody inhibition","journal":"Biophysical journal","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution plus mutagenesis plus antibody inhibition in a single study","pmids":["16339885"],"is_preprint":false},{"year":2007,"finding":"CLIC1 (and CLIC5, but not CLIC4) channel activity in planar lipid bilayers is strongly and reversibly inhibited by F-actin in the absence of any other protein. This inhibition is reversed by cytochalasin-mediated F-actin disruption.","method":"Planar lipid bilayer electrophysiology with purified recombinant CLIC1/CLIC4/CLIC5; F-actin addition and cytochalasin treatment","journal":"The FEBS journal","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — in vitro reconstitution with direct actin addition, single lab, limited follow-up","pmids":["18028448"],"is_preprint":false},{"year":2008,"finding":"At acidic pH, CLIC1 forms a highly populated partially unfolded intermediate with a solvent-exposed hydrophobic surface. This acid-induced destabilization involves helix α1 (the major structural element of the transmembrane region), suggesting that the acidic environment at membrane surfaces primes the transmembrane region and lowers the energy barrier for membrane insertion.","method":"Equilibrium unfolding studies; fluorescence spectroscopy; pH titration of protein stability","journal":"Biochemistry","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — biophysical characterization of conformational intermediate with structure-function interpretation, consistent with mechanistic model","pmids":["18850721"],"is_preprint":false},{"year":2009,"finding":"CLIC1 domain 1 (containing the transmembrane region including helix α1 and peptides 11–31 and 68–82) is less stable and more conformationally flexible than domain 2, and this flexibility is further increased at acidic pH (5.5), consistent with priming of the transmembrane region for membrane insertion.","method":"Amide hydrogen-deuterium exchange mass spectrometry (DXMS) at pH 7 and 5.5","journal":"Biochemistry","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — quantitative HDX-MS revealing domain-level dynamics, single lab","pmids":["19650640"],"is_preprint":false},{"year":2010,"finding":"FRET spectroscopy demonstrated that CLIC1 undergoes a large-scale conformational unfolding between its N- and C-domains upon interaction with membrane vesicles, consistent with the N-terminal domain inserting into the bilayer while the C-domain remains on the extravesicular side.","method":"FRET spectroscopy (tryptophan 35 to native cysteines) in solution vs. membrane vesicle conditions; structural modeling","journal":"Biochemistry","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — FRET-based structural measurement, single lab, provides first direct evidence of conformational change upon membrane interaction","pmids":["20507120"],"is_preprint":false},{"year":2011,"finding":"Under oxidative conditions, the N-terminal domain of CLIC1 inserts into the lipid bilayer as an extended α-helix (residues 24–46), and CLIC1 forms oligomers upon oxidation in the presence of membranes. Intermolecular FRET fitting indicates a large oligomer consistent with approximately 6–8 subunits.","method":"Intramolecular and intermolecular FRET between fluorescently labeled CLIC1 monomers in lipid membranes; symmetric oligomer fitting","journal":"Biochemistry","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — FRET-based structural measurements with oxidative conditions, single lab","pmids":["22082111"],"is_preprint":false},{"year":2012,"finding":"In murine peritoneal macrophages, CLIC1 translocates from cytoplasmic puncta to the phagosomal membrane upon phagocytosis of opsonized zymosan. CLIC1-knockout macrophages show defective phagosome acidification, impaired phagosomal proteolytic capacity, and reduced ROS production. CLIC1-knockout mice are protected from serum-transfer-induced K/BxN arthritis.","method":"Immunofluorescence confocal microscopy; pH-sensitive fluorophore (Oregon Green) live imaging; CLIC1-/- knockout mice; in vivo arthritis model","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic knockout with multiple orthogonal functional readouts (acidification, proteolysis, ROS, in vivo disease), replicated mechanistic theme across two cell types","pmids":["22956539"],"is_preprint":false},{"year":2013,"finding":"Cholesterol in membranes regulates both the spontaneous insertion of CLIC1 into lipid membranes and its ion channel conductance. This cholesterol-dependent behavior resembles the cholesterol-dependent cytolysin family of bacterial pore-forming proteins.","method":"Langmuir lipid monolayer pressure-area measurements; tethered bilayer membrane impedance spectroscopy","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — two orthogonal biophysical methods, single lab","pmids":["23457643"],"is_preprint":false},{"year":2013,"finding":"Point mutations in the putative transmembrane region of CLIC1 selectively alter biophysical properties: the K37A mutation changes single-channel conductance, while R29A affects open probability in response to membrane potential. These results demonstrate that charged residues K37 and R29 within the transmembrane region directly regulate ion channel activity.","method":"Site-directed mutagenesis; single-channel Tip-Dip bilayer recording; cell-attached and whole-cell patch clamp in transfected HEK cells","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 1 / Strong — mutagenesis with three independent electrophysiological approaches (bilayer + two cell-based methods)","pmids":["24058583"],"is_preprint":false},{"year":2014,"finding":"CLIC1 ion channel activity (specifically Arg29-dependent) is preferentially active during the G1-S transition via transient membrane insertion. Metformin inhibits CLIC1-mediated chloride current and induces G1 arrest in glioblastoma stem cells. The R29A substitution in the CLIC1 pore region impairs metformin's modulation of channel activity.","method":"Patch clamp electrophysiology; CLIC1 mutant R29A; cell cycle analysis (G1 arrest); pharmacological inhibition in cancer stem cells","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — electrophysiology plus mutagenesis plus cell cycle analysis, single lab","pmids":["25361004"],"is_preprint":false},{"year":2014,"finding":"CLIC1 mediates regulatory volume decrease (RVD) in colon cancer cells and its chloride channel function modulates cell migration and invasion. Pharmacological blockade (IAA-94) or siRNA knockdown of CLIC1 inhibited RVD and reduced migration and invasion in a dose-dependent manner.","method":"siRNA knockdown; pharmacological inhibition (IAA-94); cell migration and invasion assays; RVD measurement","journal":"Molecular and cellular biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — two orthogonal loss-of-function methods with defined functional readouts, single lab","pmids":["22426742"],"is_preprint":false},{"year":2016,"finding":"Upon phagocytosis, CLIC1 translocates from cytoplasm to the phagosomal membrane in dendritic cells, where it regulates phagosomal pH and proteolysis. CLIC1-/- bone marrow-derived dendritic cells display impaired phagosome acidification and proteolysis, reduced antigen processing and presentation of myelin oligodendrocyte glycoprotein (MOG), and reduced MOG-induced experimental autoimmune encephalomyelitis in vivo.","method":"CLIC1-/- knockout mice; live phagosomal pH imaging; proteolysis assay; antigen presentation assay; EAE model in vivo; IAA94 pharmacological control","journal":"Biology open","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic knockout replicated in dendritic cells with multiple mechanistic readouts (pH, proteolysis, antigen presentation, in vivo EAE), extends prior macrophage findings","pmids":["27113959"],"is_preprint":false},{"year":2016,"finding":"Sterol type and concentration in lipid bilayers regulate CLIC1 ion channel activity. The Cys24 residue is not essential for CLIC1 ion channel function per se but is important for optimal activity. Both reduced and oxidized forms differ in conductance in tethered membranes.","method":"Tethered bilayer lipid membranes with electrical impedance spectroscopy; CLIC1 Cys24 mutant analysis","journal":"Membranes","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro sterol titration with mutant analysis, single lab","pmids":["27941637"],"is_preprint":false},{"year":2016,"finding":"FRET between CLIC1 Trp35 and a dansyl-labeled lipid analogue provides direct structural evidence that CLIC1 associates with lipid bilayer membranes under oxidizing conditions, with Trp35 positioned approximately 15 Å from the membrane surface, supporting a membrane-anchoring role for Trp35.","method":"FRET fluorescence spectroscopy with dansyl-lipid analogue; fluorescence quenching experiments","journal":"Biochemistry","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — direct biophysical measurement of CLIC1-membrane distance, single lab","pmids":["27299171"],"is_preprint":false},{"year":2017,"finding":"Upon LPS stimulation of macrophages, CLIC1 translocates into the nucleus and cellular membrane (shown by confocal microscopy and cell fractionation). siRNA knockdown of CLIC1 impairs IL-1β transcription, ASC speck formation, and secretion of mature IL-1β in LPS/ATP-stimulated bone marrow-derived macrophages, placing CLIC1 as a participant in both NLRP3 inflammasome priming and activation.","method":"Confocal microscopy; cell fractionation; siRNA knockdown; IL-1β ELISA; ASC speck imaging","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization experiment linked to functional consequence, two orthogonal readouts (IL-1β, ASC specks), single lab","pmids":["28576828"],"is_preprint":false},{"year":2017,"finding":"In CLIC1-null macrophages, NADPH oxidase fails to redistribute from intracellular compartment to the plasma membrane upon stimulation, resulting in dramatically reduced PMA-induced superoxide production. This establishes CLIC1's role as supporting NADPH oxidase plasma membrane redistribution rather than acting primarily as a plasma membrane chloride channel for superoxide generation.","method":"CLIC1-null (C1KO) mice; superoxide production assay in peritoneal macrophages/neutrophils; NADPH oxidase redistribution by immunofluorescence; plasma membrane chloride conductance measurement","journal":"Physiological reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic knockout with mechanistic dissection of NADPH oxidase redistribution vs. chloride channel effect, multiple orthogonal readouts","pmids":["28275112"],"is_preprint":false},{"year":2019,"finding":"CLIC4 and CLIC1 function together in cytokinesis: CLIC4 accumulates at the cleavage furrow and midbody in a RhoA-dependent manner, and its translocation requires GST activity-related residues (C35A/F37D mutations abolish this). Interaction partners ezrin, anillin, and ALIX are identified at the cleavage furrow. CLIC4 facilitates ezrin activation at the cleavage furrow. Knockout of CLIC4 and CLIC1 causes polar cortex blebbing and cleavage furrow regression leading to multinucleated cells, demonstrating that CLIC1 and CLIC4 bridge plasma membrane and actin cytoskeleton for cortical stability.","method":"CLIC4/CLIC1 knockout; live imaging; immunofluorescence; Co-IP (ezrin, anillin, ALIX); site-directed mutagenesis (C35A, F37D)","journal":"Life science alliance","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic knockout with rescue, Co-IP of interaction partners, mutagenesis of functional residues, and multiple phenotypic readouts","pmids":["31879279"],"is_preprint":false},{"year":2021,"finding":"Membrane-targeted CLIC1 recruits PIP5K1A and PIP5K1C from cytoplasm to the leading edge of the plasma membrane in response to migration stimuli, where PIP5Ks generate a PIP2-rich microdomain that induces integrin-mediated cell-matrix adhesions and cytoskeletal extension. CLIC1 silencing inhibited tumor cell attachment, lung alveolar adherence, and extravasation, suppressing lung metastasis in mice.","method":"Comparative proteomics; Co-IP/pulldown (CLIC1–PIP5K1A/C interaction); PIP2 microdomain imaging; CLIC1 silencing; in vivo lung metastasis mouse model","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP, PIP2 imaging, and in vivo metastasis model with defined molecular mechanism","pmids":["33079727"],"is_preprint":false},{"year":2021,"finding":"CLIC1 and CLIC4 transiently translocate to the plasma membrane in response to sphingosine-1-phosphate (S1P) in endothelial cells. Both are required for S1P-induced Rac1 activation downstream of S1PR1. Only CLIC1 (not CLIC4) is required for S1P-induced RhoA activation downstream of S1PR2/S1PR3. These CLICs mediate S1P-stimulated endothelial barrier function. Rescue experiments show CLIC1 and CLIC4 are not functionally interchangeable.","method":"Live-cell imaging of translocation; siRNA knockdown; Rac1/RhoA activation assays; endothelial barrier assay; rescue experiments","journal":"Science signaling","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple functional assays (Rac1, RhoA, barrier) with knockdown and rescue, two distinct GPCR pathway outputs separated","pmids":["33879602"],"is_preprint":false},{"year":2014,"finding":"CLIC1 in glioblastoma cells is secreted via extracellular vesicles (EVs). Treatment of GBM cells with CLIC1-containing EVs stimulates cell growth in a CLIC1-dose-dependent manner in vitro and in vivo. EVs from CLIC1-silenced cells significantly attenuate this proliferative stimulation, establishing extracellular vesicle-mediated transfer of CLIC1 as a mechanism for paracrine regulation of tumor growth.","method":"EV isolation by differential ultracentrifugation; CLIC1 western blot; in vitro proliferation assays; in vivo tumor engraftment","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA knockdown in donor cells with dose-dependent in vivo readout, single lab","pmids":["26429879"],"is_preprint":false},{"year":2014,"finding":"CLIC1 is required for cAMP-stimulated neurite elongation in retinal ganglion cells. CLIC1-mediated chloride current, detected only when cAMP is elevated, is required for maintaining growth cone morphology. PKA inhibition prevents CLIC1-mediated current, placing CLIC1 activity downstream of cAMP/PKA signaling in neuronal differentiation.","method":"Electrophysiology; pharmacological inhibition (IAA94, anti-CLIC1 antibody); immunohistochemistry; PKA inhibition; purified RGC culture","journal":"Journal of neurochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — electrophysiology plus pharmacological intervention with specific neurite outgrowth phenotype, single lab","pmids":["25060644"],"is_preprint":false},{"year":2011,"finding":"CLIC1 promotes internalization of CLT1-fibronectin co-aggregates in angiogenic endothelial cells through ligation of integrin αvβ3, which triggers translocation of CLIC1 to the cell surface. This internalization depends on the LIIQK sequence of CLT1, and CLIC1 depletion/blocking prevents uptake of CLT1-fibronectin aggregates and endothelial cytotoxicity.","method":"Co-localization in vivo; antibody blocking; integrin αvβ3 ligation; in vitro internalization assay; in vivo tumor angiogenesis model","journal":"Angiogenesis","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — functional blocking and in vivo co-localization, single lab","pmids":["22203240"],"is_preprint":false},{"year":2014,"finding":"CLIC1 promotes stability of invadopodia in endothelial and tumor cells embedded in fibrin 3D matrix through β3 integrin (ITGB3)-mediated recruitment into invadopodia, where it induces stress fiber and fibronectin matrix formation. CLIC1 depletion reduces myosin light chain kinase (MYLK) and impairs actomyosin dynamics.","method":"3D fibrin matrix invasion assay; CLIC1 siRNA knockdown; β3 integrin depletion; MYLK expression analysis; in vivo metastasis assay","journal":"Molecular cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA knockdown with mechanistic protein interaction (ITGB3, MYLK) and in vivo validation, single lab","pmids":["25205595"],"is_preprint":false},{"year":2018,"finding":"CLIC1 membrane localization and function is constitutive in glioblastoma cancer stem cells (CSCs) but not in normal mesenchymal stem cells. During G1-S transition in CSCs, CLIC1 membrane activity is temporally linked to ROS accumulation and cytoplasmic alkalinization. Inhibiting CLIC1-mediated chloride current prevents both intracellular ROS accumulation and pH changes, arresting CSCs in G1.","method":"Patch clamp electrophysiology; ROS measurement; cytoplasmic pH measurement; cell cycle analysis; pharmacological and antibody inhibition in CSCs vs. MSCs","journal":"Molecular cancer therapeutics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — electrophysiology plus ROS/pH imaging with cell cycle readout, establishes temporal coupling, single lab","pmids":["30135216"],"is_preprint":false},{"year":2024,"finding":"Matrix stiffness induces CLIC1 expression in pancreatic cancer through Wnt/β-catenin/TCF4 signaling. CLIC1 stabilizes HIF1α by reducing hydroxylation via ROS, thereby promoting the Warburg effect and glycolytic metabolism to drive tumor proliferation.","method":"Clinical samples, cellular and bioinformatics approaches; Wnt/β-catenin/TCF4 pathway analysis; HIF1α hydroxylation assay; glycolysis measurements; matrix stiffness manipulation","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mechanistic pathway placement with multiple approaches, single study","pmids":["39154343"],"is_preprint":false},{"year":2007,"finding":"In polarized columnar epithelia, membrane-inserted CLIC1 localizes to a sub-apical compartment overlapping megalin and the sodium-phosphate cotransporter NaPi-II (markers of the apical endocytic/recycling compartment) in renal proximal tubule cells. Digitonin extraction distinguishes membrane-inserted from soluble cytoplasmic CLIC1; in T84 colon cancer cells, membrane CLIC1 is in a sub-apical intracellular compartment enhanced by forskolin-induced apical membrane traffic.","method":"Digitonin extraction fractionation; immunofluorescence confocal microscopy; comparison to endocytic/recycling markers; forskolin stimulation","journal":"BMC cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — subcellular fractionation plus immunofluorescence with functional context (apical membrane recycling), single lab","pmids":["17326840"],"is_preprint":false},{"year":2005,"finding":"Insulin stimulation of human hematopoietic cells induces a change in the subnuclear localization pattern of CLIC1 without altering total CLIC1 protein levels (discrepancy between 1-DE and 2-DE results suggesting a qualitative/conformational change rather than abundance change).","method":"2-DE proteomics; Western blot; immunofluorescence subnuclear localization after insulin stimulation","journal":"American journal of physiology. Endocrinology and metabolism","confidence":"Low","confidence_rationale":"Tier 3 / Weak — discrepancy between methods acknowledged by authors, single lab, subnuclear localization without defined functional consequence","pmids":["15827065"],"is_preprint":false},{"year":2020,"finding":"CLIC1 binds to MYC protein (shown by co-immunoprecipitation) and enhances MYC transcriptional activity on downstream target genes without altering MYC expression levels. A positive feedback regulatory loop exists in which MYC promotes CLIC1 expression and CLIC1 in turn enhances MYC activity in hepatocellular carcinoma.","method":"Co-immunoprecipitation (CLIC1–MYC interaction); luciferase reporter for MYC transcriptional activity; CLIC1 silencing/overexpression; bioinformatics; in vivo xenograft","journal":"American journal of cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus functional reporter assay, single lab","pmids":["32905514"],"is_preprint":false}],"current_model":"CLIC1 is a metamorphic protein that exists in both a soluble monomeric form (structurally homologous to glutathione S-transferases with a redox-active Cys24/Cys59 disulfide site) and an integral membrane chloride ion channel form; oxidation and acidic pH at membrane surfaces drive a large N-domain conformational rearrangement and oligomerization (~6–8 subunits) that inserts the protein into lipid bilayers where charged residues Arg29 and Lys37 in the transmembrane region gate ion conductance, while this channel activity regulates cell cycle progression (G1/S and G2/M transitions), phagosomal acidification and NADPH oxidase redistribution in macrophages/dendritic cells, NLRP3 inflammasome priming, microglial ROS generation downstream of Aβ, GPCR-coupled Rac1/RhoA small GTPase signaling in endothelial cells, PIP5K1A/C recruitment and PIP2-dependent cell-matrix adhesion for tumor metastasis, and cytokinesis cortical stability through ezrin-mediated plasma membrane–actin bridging."},"narrative":{"mechanistic_narrative":"CLIC1 is a metamorphic protein that converts between a soluble monomeric cytosolic form and an integral-membrane anion channel, coupling cellular redox and pH state to ion conductance across diverse physiological processes [PMID:11551966, PMID:11940526]. The soluble form is structurally homologous to the glutathione S-transferase superfamily and carries a redox-active site that binds glutathione [PMID:11551966]; oxidation drives a reversible monomer-to-dimer transition through an intramolecular Cys24–Cys59 disulfide that exposes a large hydrophobic surface, with both cysteines required for channel formation [PMID:14613939]. Acidic pH at membrane surfaces destabilizes the less-stable N-terminal domain (helix α1), priming the transmembrane region for insertion [PMID:18850721, PMID:19650640], after which the N-domain unfolds and inserts into the bilayer as an extended helix and oligomerizes into assemblies of roughly six to eight subunits [PMID:20507120, PMID:22082111]. CLIC1 spontaneously inserts into protein-free lipid bilayers to form an anion-selective channel whose conductance, pharmacology and kinetics match those in transfected cells, with charged residues Arg29 and Lys37 in the transmembrane region directly gating conductance and open probability [PMID:11940526, PMID:11978800, PMID:24058583]. Through this regulated channel activity CLIC1 governs cell-cycle progression at the G1/S and G2/M transitions, coupling channel opening to ROS accumulation and cytoplasmic pH change in glioblastoma stem cells [PMID:11195932, PMID:25361004, PMID:30135216]. In macrophages and dendritic cells CLIC1 translocates to the phagosomal membrane to drive phagosomal acidification, proteolysis, antigen presentation and NADPH oxidase redistribution, and supports NLRP3 inflammasome priming and IL-1β maturation [PMID:22956539, PMID:27113959, PMID:28275112, PMID:28576828]. In microglia CLIC1 is induced by amyloid-β and translocates to the plasma membrane to sustain a feedforward, NADPH oxidase-dependent ROS loop driving neuroinflammatory toxicity [PMID:15190104, PMID:18987185]. CLIC1 also acts in GPCR-coupled S1P signaling, mediating Rac1 and RhoA activation and endothelial barrier function [PMID:33879602], recruits PIP5K1A/C to generate PIP2 microdomains driving integrin-mediated cell-matrix adhesion and metastasis [PMID:33079727], and, with CLIC4, bridges the plasma membrane to the actin cytoskeleton via ezrin to maintain cortical stability during cytokinesis [PMID:31879279].","teleology":[{"year":2000,"claim":"Established that CLIC1 is itself a transmembrane channel constituent with defined topology, settling whether it forms part of the conducting pore rather than merely regulating one.","evidence":"Electrophysiology of epitope-tagged NCC27 with side-specific antibody occlusion in transfected CHO-K1 cells","pmids":["10834939"],"confidence":"High","gaps":["Did not resolve the oligomeric stoichiometry of the channel","Mechanism of soluble-to-membrane conversion unaddressed"]},{"year":2000,"claim":"Linked CLIC1 conductance to the cell cycle, showing the channel is selectively present in G2/M and that blocking it arrests cells, implying a functional role beyond passive chloride flux.","evidence":"Cell-cycle-resolved electrophysiology with pharmacological chloride channel blockade in CHO-K1 cells","pmids":["11195932"],"confidence":"Medium","gaps":["Pharmacological blockers are not CLIC1-specific","Molecular link between conductance and cycle control not defined"]},{"year":2001,"claim":"Defined the soluble fold of CLIC1, revealing GST-superfamily homology and a glutaredoxin-like redox site, and nominated the N-domain as the region needing rearrangement for membrane insertion.","evidence":"1.4-Å X-ray crystallography of soluble CLIC1 in complex with glutathione","pmids":["11551966"],"confidence":"High","gaps":["Membrane-inserted structure not determined","No catalytic GST activity demonstrated"]},{"year":2002,"claim":"Demonstrated that purified CLIC1 alone can build a functional anion channel by inserting into protein-free bilayers, establishing autonomous, redox- and pH-sensitive channel-forming capacity.","evidence":"Chloride efflux from vesicles plus planar bilayer electrophysiology with recombinant protein; comparison to transfected CHO cells","pmids":["11940526","11978800"],"confidence":"High","gaps":["Number of subunits per channel inferred indirectly","Trigger for insertion in vivo not identified"]},{"year":2003,"claim":"Identified the redox switch controlling the metamorphic transition, showing oxidation forms an intramolecular Cys24–Cys59 disulfide and a hydrophobic-surface dimer required for channel activity.","evidence":"X-ray crystallography of oxidized CLIC1, site-directed mutagenesis, and bilayer/vesicle reconstitution","pmids":["14613939"],"confidence":"High","gaps":["How the oxidized dimer assembles into a membrane oligomer not shown","Physiological oxidant in cells not defined here"]},{"year":2004,"claim":"Connected CLIC1 to neuroinflammation, showing amyloid-β induces CLIC1 and that its loss blocks TNF-α release and downstream neurotoxicity.","evidence":"siRNA knockdown, pharmacological inhibition, electrophysiology and neuron co-culture neurotoxicity assay in rat microglia","pmids":["15190104"],"confidence":"High","gaps":["Direct chain from chloride flux to cytokine release not resolved","Did not address ROS dependency"]},{"year":2005,"claim":"Localized the redox-sensitive Cys24 to the extracellular/luminal face near the pore and proposed an intersubunit disulfide regulating conductance.","evidence":"Single-channel bilayer recording with C24 mutagenesis, covalent modification and antibody inhibition","pmids":["16339885"],"confidence":"High","gaps":["Intersubunit disulfide inferred not directly visualized","Quantitative subunit arrangement unresolved"]},{"year":2008,"claim":"Resolved how amyloid-β engages CLIC1, defining a feedforward loop in which NADPH oxidase-derived ROS oxidize and activate membrane CLIC1, which in turn sustains ROS generation.","evidence":"Live-cell translocation imaging, siRNA, antibody inhibition, anion substitution and ROS assays in microglia","pmids":["18987185"],"confidence":"High","gaps":["Molecular link between chloride conductance and oxidase activity not mechanistically defined","Translocation machinery unknown"]},{"year":2008,"claim":"Provided the biophysical basis for pH-triggered insertion, showing acidic pH produces a partially unfolded intermediate with exposed hydrophobic surface centered on helix α1.","evidence":"Equilibrium unfolding, fluorescence spectroscopy and pH titration of CLIC1 stability","pmids":["18850721"],"confidence":"Medium","gaps":["Intermediate characterized in solution, not on membranes","Does not establish insertion kinetics"]},{"year":2009,"claim":"Mapped domain-level dynamics, showing domain 1 (the transmembrane region) is intrinsically less stable and further destabilized at acidic pH, reinforcing the priming model.","evidence":"Hydrogen-deuterium exchange mass spectrometry at pH 7 and 5.5","pmids":["19650640"],"confidence":"Medium","gaps":["No direct membrane-inserted conformation captured","Single-lab quantitative HDX"]},{"year":2010,"claim":"Provided first direct evidence of the large-scale conformational change on membrane contact, showing N- and C-domain separation upon vesicle interaction.","evidence":"FRET spectroscopy (Trp35 to native cysteines) comparing solution and vesicle conditions","pmids":["20507120"],"confidence":"Medium","gaps":["Atomic structure of inserted state not obtained","Single-lab FRET model"]},{"year":2011,"claim":"Defined the inserted-state architecture, showing the N-domain enters the bilayer as an extended helix (residues 24–46) and oligomerizes to ~6–8 subunits under oxidation.","evidence":"Intramolecular and intermolecular FRET with symmetric oligomer fitting in membranes","pmids":["22082111"],"confidence":"Medium","gaps":["Exact subunit count is a fitted estimate","Pore geometry not directly resolved"]},{"year":2011,"claim":"Connected CLIC1 surface translocation to integrin signaling, showing αvβ3 ligation drives CLIC1 to the surface to internalize CLT1-fibronectin aggregates in angiogenic endothelium.","evidence":"Antibody blocking, integrin ligation, internalization assay and in vivo angiogenesis model","pmids":["22203240"],"confidence":"Medium","gaps":["Direct CLIC1–integrin physical interaction not established","Single-lab weak-tier evidence"]},{"year":2012,"claim":"Provided the first genetic loss-of-function proof of physiological function, showing CLIC1 translocates to phagosomes and is required for acidification, proteolysis and ROS in macrophages, with protection from arthritis in knockouts.","evidence":"CLIC1-/- mice, pH-sensitive phagosomal imaging, proteolysis and ROS assays, K/BxN arthritis model","pmids":["22956539"],"confidence":"High","gaps":["Whether phagosomal effect requires channel conductance vs. another activity not separated here","Recruitment mechanism to phagosome unknown"]},{"year":2013,"claim":"Identified membrane lipid composition, specifically cholesterol/sterols, as a determinant of CLIC1 insertion and conductance, drawing a parallel to cholesterol-dependent cytolysins.","evidence":"Langmuir monolayer measurements and tethered bilayer impedance spectroscopy","pmids":["23457643","27941637"],"confidence":"Medium","gaps":["Sterol effect demonstrated in artificial membranes only","Cellular relevance of sterol dependence untested"]},{"year":2013,"claim":"Pinpointed the residues gating conductance, showing K37 controls single-channel conductance and R29 controls voltage-dependent open probability within the transmembrane region.","evidence":"Site-directed mutagenesis with Tip-Dip bilayer, cell-attached and whole-cell patch clamp in HEK cells","pmids":["24058583"],"confidence":"High","gaps":["Does not define full pore-lining residue set","Selectivity filter not mapped"]},{"year":2014,"claim":"Tied the channel to the G1-S transition and to a druggable target, showing R29-dependent transient insertion is required for G1-S progression and that metformin inhibits the current to arrest glioblastoma stem cells.","evidence":"Patch clamp, R29A mutant, cell-cycle analysis and pharmacology in cancer stem cells","pmids":["25361004"],"confidence":"Medium","gaps":["Direct metformin binding to CLIC1 not shown","Coupling of conductance to cycle machinery undefined"]},{"year":2014,"claim":"Established roles in cancer cell physiology and paracrine signaling, linking CLIC1 to regulatory volume decrease, migration/invasion, invadopodia stability via ITGB3/MYLK, and EV-mediated transfer driving tumor growth.","evidence":"siRNA/pharmacology with RVD, migration, invasion and 3D invadopodia assays; EV isolation and in vivo engraftment","pmids":["22426742","25205595","26429879"],"confidence":"Medium","gaps":["Channel-dependence of invadopodia/EV effects not fully separated","Single-lab studies"]},{"year":2014,"claim":"Placed CLIC1 downstream of cAMP/PKA in neuronal differentiation, showing its current appears only on cAMP elevation and is required for growth cone maintenance and neurite elongation.","evidence":"Electrophysiology with PKA inhibition, IAA94 and antibody block in retinal ganglion cell culture","pmids":["25060644"],"confidence":"Medium","gaps":["How PKA enables CLIC1 current not defined","Single-lab evidence"]},{"year":2016,"claim":"Generalized the phagosomal role to dendritic cells and connected it to adaptive immunity, showing CLIC1 loss impairs phagosomal acidification, antigen presentation and EAE.","evidence":"CLIC1-/- BMDCs, phagosomal pH imaging, proteolysis and antigen presentation assays, in vivo EAE","pmids":["27113959"],"confidence":"High","gaps":["Mechanism coupling chloride flux to acidification not isolated","Recruitment trigger unknown"]},{"year":2016,"claim":"Positioned Trp35 as a membrane anchor, measuring its proximity (~15 Å) to the bilayer under oxidation and confirming oxidation-dependent membrane association.","evidence":"FRET between Trp35 and dansyl-lipid analogue with quenching experiments","pmids":["27299171"],"confidence":"Medium","gaps":["Single residue probe; full insertion path not mapped","Single-lab FRET"]},{"year":2017,"claim":"Dissected the inflammasome and oxidase contributions, showing CLIC1 supports NLRP3 priming/IL-1β maturation and is required for NADPH oxidase redistribution to the plasma membrane rather than acting solely as a surface chloride channel.","evidence":"siRNA with IL-1β ELISA and ASC speck imaging; CLIC1-null mice with superoxide assays and oxidase redistribution imaging","pmids":["28576828","28275112"],"confidence":"High","gaps":["Molecular basis for oxidase redistribution dependence on CLIC1 unknown","Nuclear translocation role in priming undefined"]},{"year":2019,"claim":"Defined a cytoskeletal scaffolding function in cytokinesis, showing CLIC1 with CLIC4 bridges plasma membrane and actin via ezrin and that loss causes furrow regression and multinucleation.","evidence":"CLIC4/CLIC1 knockout, live imaging, Co-IP of ezrin/anillin/ALIX and functional-residue mutagenesis","pmids":["31879279"],"confidence":"High","gaps":["Whether CLIC1's contribution requires channel activity not separated","Direct CLIC1 binding partner at furrow vs. CLIC4 not fully resolved"]},{"year":2020,"claim":"Identified a nuclear/transcriptional partnership, showing CLIC1 binds MYC and amplifies its transcriptional activity in a positive feedback loop in hepatocellular carcinoma.","evidence":"Co-IP, luciferase reporter, CLIC1 silencing/overexpression and xenograft","pmids":["32905514"],"confidence":"Medium","gaps":["Single Co-IP without reciprocal structural validation","Mechanism by which CLIC1 enhances MYC activity unknown"]},{"year":2021,"claim":"Resolved a membrane-signaling mechanism for metastasis and GPCR responses, showing CLIC1 recruits PIP5K1A/C to generate PIP2 microdomains for integrin adhesion and mediates S1P-driven Rac1/RhoA activation and endothelial barrier function non-redundantly with CLIC4.","evidence":"Proteomics/Co-IP, PIP2 imaging and in vivo metastasis; live imaging, siRNA, Rac1/RhoA assays, barrier assays and rescue in endothelial cells","pmids":["33079727","33879602"],"confidence":"High","gaps":["How CLIC1 selects PIP5K isoforms vs. GTPase effectors not defined","Channel-activity requirement for these scaffolding roles unresolved"]},{"year":2024,"claim":"Linked mechanical signaling to metabolism, showing matrix stiffness induces CLIC1 via Wnt/β-catenin/TCF4 and CLIC1 stabilizes HIF1α through ROS to promote the Warburg effect.","evidence":"Clinical samples, pathway analysis, HIF1α hydroxylation and glycolysis assays with matrix stiffness manipulation in pancreatic cancer","pmids":["39154343"],"confidence":"Medium","gaps":["Direct CLIC1 effect on HIF1α hydroxylase activity not biochemically resolved","Single study"]},{"year":null,"claim":"It remains unresolved which CLIC1 functions strictly require ion conductance versus a redox/scaffolding activity, and no atomic-resolution structure of the membrane-inserted oligomeric channel has been determined.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No high-resolution structure of the inserted channel","Conductance-dependent vs. scaffolding roles not systematically separated across cell types","Cellular machinery directing translocation to specific membranes unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005215","term_label":"transporter activity","supporting_discovery_ids":[1,2,5,16]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[1,3,13]},{"term_id":"GO:0140299","term_label":"molecular sensor activity","supporting_discovery_ids":[3,8,10]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[24,25]},{"term_id":"GO:0008289","term_label":"lipid 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stimuli","supporting_discovery_ids":[7,31,32]}],"complexes":[],"partners":["CLIC4","EZR","PIP5K1A","PIP5K1C","ITGB3","MYC","ANLN","PDCD6IP"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"O00299","full_name":"Chloride intracellular channel protein 1","aliases":["Chloride channel ABP","Glutaredoxin-like oxidoreductase CLIC1","Glutathione-dependent dehydroascorbate reductase CLIC1","Nuclear chloride ion channel 27","NCC27","Regulatory nuclear chloride ion channel protein","hRNCC"],"length_aa":241,"mass_kda":26.9,"function":"In the soluble state, catalyzes glutaredoxin-like thiol disulfide exchange reactions with reduced glutathione as electron donor. Reduces selenite and dehydroascorbate and may act as an antioxidant during oxidative stress response (PubMed:25581026, PubMed:37759794). Can insert into membranes and form voltage-dependent multi-ion conductive channels. Membrane insertion seems to be redox-regulated and may occur only under oxidizing conditions. Involved in regulation of the cell cycle","subcellular_location":"Nucleus; Nucleus membrane; Cytoplasm; Cell membrane; Endoplasmic reticulum","url":"https://www.uniprot.org/uniprotkb/O00299/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CLIC1","classification":"Not Classified","n_dependent_lines":4,"n_total_lines":1208,"dependency_fraction":0.0033112582781456954},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"MED19","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/CLIC1","total_profiled":1310},"omim":[{"mim_id":"620638","title":"POTASSIUM CHANNEL TETRAMERIZATION DOMAIN-CONTAINING PROTEIN 4; KCTD4","url":"https://www.omim.org/entry/620638"},{"mim_id":"615321","title":"CHLORIDE INTRACELLULAR CHANNEL 6; CLIC6","url":"https://www.omim.org/entry/615321"},{"mim_id":"607293","title":"CHLORIDE INTRACELLULAR CHANNEL 5; CLIC5","url":"https://www.omim.org/entry/607293"},{"mim_id":"606536","title":"CHLORIDE INTRACELLULAR CHANNEL 4; CLIC4","url":"https://www.omim.org/entry/606536"},{"mim_id":"606533","title":"CHLORIDE INTRACELLULAR CHANNEL 3; CLIC3","url":"https://www.omim.org/entry/606533"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Cytosol","reliability":"Supported"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/CLIC1"},"hgnc":{"alias_symbol":["NCC27","p64CLCP","G6","CLCNL1"],"prev_symbol":[]},"alphafold":{"accession":"O00299","domains":[{"cath_id":"3.40.30.10","chopping":"9-88","consensus_level":"high","plddt":96.2671,"start":9,"end":88},{"cath_id":"1.20.1050.10","chopping":"102-235","consensus_level":"high","plddt":94.2134,"start":102,"end":235}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O00299","model_url":"https://alphafold.ebi.ac.uk/files/AF-O00299-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O00299-F1-predicted_aligned_error_v6.png","plddt_mean":94.19},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CLIC1","jax_strain_url":"https://www.jax.org/strain/search?query=CLIC1"},"sequence":{"accession":"O00299","fasta_url":"https://rest.uniprot.org/uniprotkb/O00299.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O00299/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O00299"}},"corpus_meta":[{"pmid":"11137219","id":"PMC_11137219","title":"Identification of HLA-G7 as a new splice variant of the HLA-G mRNA and expression of soluble HLA-G5, -G6, and -G7 transcripts in human transfected cells.","date":"2000","source":"Human immunology","url":"https://pubmed.ncbi.nlm.nih.gov/11137219","citation_count":265,"is_preprint":false},{"pmid":"14613939","id":"PMC_14613939","title":"The intracellular chloride ion channel protein CLIC1 undergoes a redox-controlled structural transition.","date":"2003","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/14613939","citation_count":193,"is_preprint":false},{"pmid":"11551966","id":"PMC_11551966","title":"Crystal structure of a soluble form of the intracellular chloride ion channel CLIC1 (NCC27) at 1.4-A resolution.","date":"2001","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/11551966","citation_count":174,"is_preprint":false},{"pmid":"1370851","id":"PMC_1370851","title":"Isolation and characterization of two distinct human rotavirus strains with G6 specificity.","date":"1992","source":"Journal of clinical microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/1370851","citation_count":151,"is_preprint":false},{"pmid":"28576828","id":"PMC_28576828","title":"The intracellular chloride channel proteins CLIC1 and CLIC4 induce IL-1β transcription and activate the NLRP3 inflammasome.","date":"2017","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/28576828","citation_count":146,"is_preprint":false},{"pmid":"11195932","id":"PMC_11195932","title":"The nuclear chloride ion channel NCC27 is involved in regulation of the cell cycle.","date":"2000","source":"The Journal of physiology","url":"https://pubmed.ncbi.nlm.nih.gov/11195932","citation_count":133,"is_preprint":false},{"pmid":"25546839","id":"PMC_25546839","title":"Chloride channels in cancer: Focus on chloride intracellular channel 1 and 4 (CLIC1 AND CLIC4) proteins in tumor development and as novel therapeutic targets.","date":"2014","source":"Biochimica et biophysica acta","url":"https://pubmed.ncbi.nlm.nih.gov/25546839","citation_count":125,"is_preprint":false},{"pmid":"18987185","id":"PMC_18987185","title":"CLIC1 function is required for beta-amyloid-induced generation of reactive oxygen species by microglia.","date":"2008","source":"The Journal of neuroscience : the official journal of the Society for Neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/18987185","citation_count":121,"is_preprint":false},{"pmid":"12460571","id":"PMC_12460571","title":"The calcium activation of gelsolin: insights from the 3A structure of the G4-G6/actin complex.","date":"2002","source":"Journal of molecular biology","url":"https://pubmed.ncbi.nlm.nih.gov/12460571","citation_count":115,"is_preprint":false},{"pmid":"11940526","id":"PMC_11940526","title":"CLIC1 inserts from the aqueous phase into phospholipid membranes, where it functions as an anion channel.","date":"2002","source":"American journal of physiology. 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soluble CLIC1 (NCC27) determined at 1.4-Å resolution, showing the protein is monomeric and structurally homologous to the glutathione S-transferase superfamily with a redox-active site resembling glutaredoxin. Glutathione was shown to occupy the redox-active site. The N-domain (residues 1–90) was identified as the putative transmembrane region requiring major structural rearrangement for membrane integration.\",\n      \"method\": \"X-ray crystallography at 1.4-Å resolution; complex with glutathione\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — high-resolution crystal structure with ligand-bound complex, foundational structural paper replicated by subsequent studies\",\n      \"pmids\": [\"11551966\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Soluble CLIC1 spontaneously inserts into preformed phospholipid membranes from aqueous solution (without detergent) to function as an anion-selective channel. Channel activity is inhibited by IAA-94, N-ethylmaleimide, and glutathione, is heat-inactivated, and depends on pH and lipid composition.\",\n      \"method\": \"Chloride efflux assay with lipid vesicles; planar lipid bilayer electrophysiology; purified recombinant protein\",\n      \"journal\": \"American journal of physiology. Cell physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstitution in vitro with two orthogonal methods (vesicle efflux + bilayer), replicated by other groups\",\n      \"pmids\": [\"11940526\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Recombinant CLIC1 integrates into artificial lipid bilayers via a pH-dependent two-state process, forming chloride-selective channels with conductance, pharmacology, and kinetics identical to those in CLIC1-transfected CHO cells. The assembly transitions from small-conductance slow-kinetics modules to a high-conductance fast-kinetics channel consistent with a tetrameric assembly.\",\n      \"method\": \"Planar lipid bilayer electrophysiology; comparison with patch-clamp recordings in transfected CHO cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstitution in vitro replicated in cell-based recordings, multiple electrophysiological parameters compared\",\n      \"pmids\": [\"11978800\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"On oxidation, CLIC1 undergoes a reversible transition from a monomeric to a non-covalent dimeric state via formation of an intramolecular disulfide bond between Cys-24 and Cys-59. The crystal structure of the oxidized dimer reveals a major structural transition exposing a large hydrophobic surface that forms the dimer interface. The oxidized dimer retains the ability to form chloride channels in bilayers/vesicles, whereas reducing conditions prevent channel formation. Mutagenesis showed both Cys-24 and Cys-59 are required for channel activity.\",\n      \"method\": \"X-ray crystallography of oxidized CLIC1; site-directed mutagenesis; artificial bilayer and vesicle electrophysiology\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure plus mutagenesis plus functional reconstitution in a single study\",\n      \"pmids\": [\"14613939\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"NCC27 (CLIC1) chloride conductance is selectively expressed on the plasma membrane of CHO-K1 cells in G2/M phase of the cell cycle. Chloride channel blockers that block NCC27 arrest CHO-K1 cells in G2/M, supporting a role for NCC27 in cell cycle regulation.\",\n      \"method\": \"Electrophysiology across cell cycle stages; pharmacological chloride channel blockade with cell cycle analysis\",\n      \"journal\": \"The Journal of physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — electrophysiology combined with pharmacological cell cycle arrest, single lab, two orthogonal readouts\",\n      \"pmids\": [\"11195932\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"NCC27/CLIC1 is a transmembrane protein that directly forms part of the ion channel. The amino terminus projects to the extracellular/luminal side and the carboxyl terminus projects intracellularly. Selective antibody blockade of the epitope tag confirmed N-terminal topology. Chloride conductance is essentially identical on plasma and nuclear membranes.\",\n      \"method\": \"Electrophysiology of epitope-tagged NCC27 in transfected CHO-K1 cells; antibody inhibition from defined membrane sides; patch clamp\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct functional mutagenesis/topology experiment with antibody occlusion and dual-side recordings in a single study\",\n      \"pmids\": [\"10834939\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Beta-amyloid (Aβ) stimulation of rat microglia specifically increases CLIC1 protein expression and functional CLIC1 chloride conductance on the plasma membrane. Knockdown of CLIC1 by siRNA prevents Aβ-induced TNF-α release. Pharmacological blockade of CLIC1 (IAA-94) prevents neuronal apoptosis in neurons co-cultured with Aβ-treated microglia.\",\n      \"method\": \"siRNA knockdown; pharmacological inhibition; electrophysiology; neurotoxicity co-culture assay\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — two orthogonal loss-of-function approaches (siRNA + pharmacology) with specific phenotypic readouts, replicated by subsequent studies\",\n      \"pmids\": [\"15190104\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Aβ promotes acute translocation of CLIC1 from cytosol to the plasma membrane of microglia, where it mediates a chloride conductance required for NADPH oxidase-dependent ROS generation. CLIC1 activation is itself dependent on oxidation by NADPH oxidase-derived ROS, establishing a feedforward mechanism. Blockade by anti-CLIC1 antibody, impermeant anion substitution, or siRNA all prevented Aβ-induced ROS generation.\",\n      \"method\": \"Live-cell imaging of CLIC1 translocation; siRNA knockdown; antibody inhibition; anion substitution; ROS assay\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal interventions (siRNA, antibody, pharmacology, anion substitution) converging on a defined feedforward mechanism\",\n      \"pmids\": [\"18987185\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Cysteine 24 (in a cysteine-proline motif) is a critical redox-sensitive residue located on the extracellular/luminal side of membrane CLIC1 subunits near the putative channel pore. Under oxidizing conditions on the extracellular side, single-channel current amplitudes are minimized. Site-directed mutagenesis and covalent modification support an intersubunit disulfide bond mechanism for channel regulation.\",\n      \"method\": \"Planar lipid bilayer single-channel recording; site-directed mutagenesis (C24 and related residues); covalent functional modification; anti-CLIC1 antibody inhibition\",\n      \"journal\": \"Biophysical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution plus mutagenesis plus antibody inhibition in a single study\",\n      \"pmids\": [\"16339885\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"CLIC1 (and CLIC5, but not CLIC4) channel activity in planar lipid bilayers is strongly and reversibly inhibited by F-actin in the absence of any other protein. This inhibition is reversed by cytochalasin-mediated F-actin disruption.\",\n      \"method\": \"Planar lipid bilayer electrophysiology with purified recombinant CLIC1/CLIC4/CLIC5; F-actin addition and cytochalasin treatment\",\n      \"journal\": \"The FEBS journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — in vitro reconstitution with direct actin addition, single lab, limited follow-up\",\n      \"pmids\": [\"18028448\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"At acidic pH, CLIC1 forms a highly populated partially unfolded intermediate with a solvent-exposed hydrophobic surface. This acid-induced destabilization involves helix α1 (the major structural element of the transmembrane region), suggesting that the acidic environment at membrane surfaces primes the transmembrane region and lowers the energy barrier for membrane insertion.\",\n      \"method\": \"Equilibrium unfolding studies; fluorescence spectroscopy; pH titration of protein stability\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — biophysical characterization of conformational intermediate with structure-function interpretation, consistent with mechanistic model\",\n      \"pmids\": [\"18850721\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"CLIC1 domain 1 (containing the transmembrane region including helix α1 and peptides 11–31 and 68–82) is less stable and more conformationally flexible than domain 2, and this flexibility is further increased at acidic pH (5.5), consistent with priming of the transmembrane region for membrane insertion.\",\n      \"method\": \"Amide hydrogen-deuterium exchange mass spectrometry (DXMS) at pH 7 and 5.5\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — quantitative HDX-MS revealing domain-level dynamics, single lab\",\n      \"pmids\": [\"19650640\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"FRET spectroscopy demonstrated that CLIC1 undergoes a large-scale conformational unfolding between its N- and C-domains upon interaction with membrane vesicles, consistent with the N-terminal domain inserting into the bilayer while the C-domain remains on the extravesicular side.\",\n      \"method\": \"FRET spectroscopy (tryptophan 35 to native cysteines) in solution vs. membrane vesicle conditions; structural modeling\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — FRET-based structural measurement, single lab, provides first direct evidence of conformational change upon membrane interaction\",\n      \"pmids\": [\"20507120\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Under oxidative conditions, the N-terminal domain of CLIC1 inserts into the lipid bilayer as an extended α-helix (residues 24–46), and CLIC1 forms oligomers upon oxidation in the presence of membranes. Intermolecular FRET fitting indicates a large oligomer consistent with approximately 6–8 subunits.\",\n      \"method\": \"Intramolecular and intermolecular FRET between fluorescently labeled CLIC1 monomers in lipid membranes; symmetric oligomer fitting\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — FRET-based structural measurements with oxidative conditions, single lab\",\n      \"pmids\": [\"22082111\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"In murine peritoneal macrophages, CLIC1 translocates from cytoplasmic puncta to the phagosomal membrane upon phagocytosis of opsonized zymosan. CLIC1-knockout macrophages show defective phagosome acidification, impaired phagosomal proteolytic capacity, and reduced ROS production. CLIC1-knockout mice are protected from serum-transfer-induced K/BxN arthritis.\",\n      \"method\": \"Immunofluorescence confocal microscopy; pH-sensitive fluorophore (Oregon Green) live imaging; CLIC1-/- knockout mice; in vivo arthritis model\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic knockout with multiple orthogonal functional readouts (acidification, proteolysis, ROS, in vivo disease), replicated mechanistic theme across two cell types\",\n      \"pmids\": [\"22956539\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Cholesterol in membranes regulates both the spontaneous insertion of CLIC1 into lipid membranes and its ion channel conductance. This cholesterol-dependent behavior resembles the cholesterol-dependent cytolysin family of bacterial pore-forming proteins.\",\n      \"method\": \"Langmuir lipid monolayer pressure-area measurements; tethered bilayer membrane impedance spectroscopy\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — two orthogonal biophysical methods, single lab\",\n      \"pmids\": [\"23457643\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Point mutations in the putative transmembrane region of CLIC1 selectively alter biophysical properties: the K37A mutation changes single-channel conductance, while R29A affects open probability in response to membrane potential. These results demonstrate that charged residues K37 and R29 within the transmembrane region directly regulate ion channel activity.\",\n      \"method\": \"Site-directed mutagenesis; single-channel Tip-Dip bilayer recording; cell-attached and whole-cell patch clamp in transfected HEK cells\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — mutagenesis with three independent electrophysiological approaches (bilayer + two cell-based methods)\",\n      \"pmids\": [\"24058583\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"CLIC1 ion channel activity (specifically Arg29-dependent) is preferentially active during the G1-S transition via transient membrane insertion. Metformin inhibits CLIC1-mediated chloride current and induces G1 arrest in glioblastoma stem cells. The R29A substitution in the CLIC1 pore region impairs metformin's modulation of channel activity.\",\n      \"method\": \"Patch clamp electrophysiology; CLIC1 mutant R29A; cell cycle analysis (G1 arrest); pharmacological inhibition in cancer stem cells\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — electrophysiology plus mutagenesis plus cell cycle analysis, single lab\",\n      \"pmids\": [\"25361004\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"CLIC1 mediates regulatory volume decrease (RVD) in colon cancer cells and its chloride channel function modulates cell migration and invasion. Pharmacological blockade (IAA-94) or siRNA knockdown of CLIC1 inhibited RVD and reduced migration and invasion in a dose-dependent manner.\",\n      \"method\": \"siRNA knockdown; pharmacological inhibition (IAA-94); cell migration and invasion assays; RVD measurement\",\n      \"journal\": \"Molecular and cellular biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — two orthogonal loss-of-function methods with defined functional readouts, single lab\",\n      \"pmids\": [\"22426742\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Upon phagocytosis, CLIC1 translocates from cytoplasm to the phagosomal membrane in dendritic cells, where it regulates phagosomal pH and proteolysis. CLIC1-/- bone marrow-derived dendritic cells display impaired phagosome acidification and proteolysis, reduced antigen processing and presentation of myelin oligodendrocyte glycoprotein (MOG), and reduced MOG-induced experimental autoimmune encephalomyelitis in vivo.\",\n      \"method\": \"CLIC1-/- knockout mice; live phagosomal pH imaging; proteolysis assay; antigen presentation assay; EAE model in vivo; IAA94 pharmacological control\",\n      \"journal\": \"Biology open\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic knockout replicated in dendritic cells with multiple mechanistic readouts (pH, proteolysis, antigen presentation, in vivo EAE), extends prior macrophage findings\",\n      \"pmids\": [\"27113959\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Sterol type and concentration in lipid bilayers regulate CLIC1 ion channel activity. The Cys24 residue is not essential for CLIC1 ion channel function per se but is important for optimal activity. Both reduced and oxidized forms differ in conductance in tethered membranes.\",\n      \"method\": \"Tethered bilayer lipid membranes with electrical impedance spectroscopy; CLIC1 Cys24 mutant analysis\",\n      \"journal\": \"Membranes\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro sterol titration with mutant analysis, single lab\",\n      \"pmids\": [\"27941637\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"FRET between CLIC1 Trp35 and a dansyl-labeled lipid analogue provides direct structural evidence that CLIC1 associates with lipid bilayer membranes under oxidizing conditions, with Trp35 positioned approximately 15 Å from the membrane surface, supporting a membrane-anchoring role for Trp35.\",\n      \"method\": \"FRET fluorescence spectroscopy with dansyl-lipid analogue; fluorescence quenching experiments\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct biophysical measurement of CLIC1-membrane distance, single lab\",\n      \"pmids\": [\"27299171\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Upon LPS stimulation of macrophages, CLIC1 translocates into the nucleus and cellular membrane (shown by confocal microscopy and cell fractionation). siRNA knockdown of CLIC1 impairs IL-1β transcription, ASC speck formation, and secretion of mature IL-1β in LPS/ATP-stimulated bone marrow-derived macrophages, placing CLIC1 as a participant in both NLRP3 inflammasome priming and activation.\",\n      \"method\": \"Confocal microscopy; cell fractionation; siRNA knockdown; IL-1β ELISA; ASC speck imaging\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization experiment linked to functional consequence, two orthogonal readouts (IL-1β, ASC specks), single lab\",\n      \"pmids\": [\"28576828\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"In CLIC1-null macrophages, NADPH oxidase fails to redistribute from intracellular compartment to the plasma membrane upon stimulation, resulting in dramatically reduced PMA-induced superoxide production. This establishes CLIC1's role as supporting NADPH oxidase plasma membrane redistribution rather than acting primarily as a plasma membrane chloride channel for superoxide generation.\",\n      \"method\": \"CLIC1-null (C1KO) mice; superoxide production assay in peritoneal macrophages/neutrophils; NADPH oxidase redistribution by immunofluorescence; plasma membrane chloride conductance measurement\",\n      \"journal\": \"Physiological reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic knockout with mechanistic dissection of NADPH oxidase redistribution vs. chloride channel effect, multiple orthogonal readouts\",\n      \"pmids\": [\"28275112\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CLIC4 and CLIC1 function together in cytokinesis: CLIC4 accumulates at the cleavage furrow and midbody in a RhoA-dependent manner, and its translocation requires GST activity-related residues (C35A/F37D mutations abolish this). Interaction partners ezrin, anillin, and ALIX are identified at the cleavage furrow. CLIC4 facilitates ezrin activation at the cleavage furrow. Knockout of CLIC4 and CLIC1 causes polar cortex blebbing and cleavage furrow regression leading to multinucleated cells, demonstrating that CLIC1 and CLIC4 bridge plasma membrane and actin cytoskeleton for cortical stability.\",\n      \"method\": \"CLIC4/CLIC1 knockout; live imaging; immunofluorescence; Co-IP (ezrin, anillin, ALIX); site-directed mutagenesis (C35A, F37D)\",\n      \"journal\": \"Life science alliance\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic knockout with rescue, Co-IP of interaction partners, mutagenesis of functional residues, and multiple phenotypic readouts\",\n      \"pmids\": [\"31879279\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Membrane-targeted CLIC1 recruits PIP5K1A and PIP5K1C from cytoplasm to the leading edge of the plasma membrane in response to migration stimuli, where PIP5Ks generate a PIP2-rich microdomain that induces integrin-mediated cell-matrix adhesions and cytoskeletal extension. CLIC1 silencing inhibited tumor cell attachment, lung alveolar adherence, and extravasation, suppressing lung metastasis in mice.\",\n      \"method\": \"Comparative proteomics; Co-IP/pulldown (CLIC1–PIP5K1A/C interaction); PIP2 microdomain imaging; CLIC1 silencing; in vivo lung metastasis mouse model\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP, PIP2 imaging, and in vivo metastasis model with defined molecular mechanism\",\n      \"pmids\": [\"33079727\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"CLIC1 and CLIC4 transiently translocate to the plasma membrane in response to sphingosine-1-phosphate (S1P) in endothelial cells. Both are required for S1P-induced Rac1 activation downstream of S1PR1. Only CLIC1 (not CLIC4) is required for S1P-induced RhoA activation downstream of S1PR2/S1PR3. These CLICs mediate S1P-stimulated endothelial barrier function. Rescue experiments show CLIC1 and CLIC4 are not functionally interchangeable.\",\n      \"method\": \"Live-cell imaging of translocation; siRNA knockdown; Rac1/RhoA activation assays; endothelial barrier assay; rescue experiments\",\n      \"journal\": \"Science signaling\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple functional assays (Rac1, RhoA, barrier) with knockdown and rescue, two distinct GPCR pathway outputs separated\",\n      \"pmids\": [\"33879602\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"CLIC1 in glioblastoma cells is secreted via extracellular vesicles (EVs). Treatment of GBM cells with CLIC1-containing EVs stimulates cell growth in a CLIC1-dose-dependent manner in vitro and in vivo. EVs from CLIC1-silenced cells significantly attenuate this proliferative stimulation, establishing extracellular vesicle-mediated transfer of CLIC1 as a mechanism for paracrine regulation of tumor growth.\",\n      \"method\": \"EV isolation by differential ultracentrifugation; CLIC1 western blot; in vitro proliferation assays; in vivo tumor engraftment\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA knockdown in donor cells with dose-dependent in vivo readout, single lab\",\n      \"pmids\": [\"26429879\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"CLIC1 is required for cAMP-stimulated neurite elongation in retinal ganglion cells. CLIC1-mediated chloride current, detected only when cAMP is elevated, is required for maintaining growth cone morphology. PKA inhibition prevents CLIC1-mediated current, placing CLIC1 activity downstream of cAMP/PKA signaling in neuronal differentiation.\",\n      \"method\": \"Electrophysiology; pharmacological inhibition (IAA94, anti-CLIC1 antibody); immunohistochemistry; PKA inhibition; purified RGC culture\",\n      \"journal\": \"Journal of neurochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — electrophysiology plus pharmacological intervention with specific neurite outgrowth phenotype, single lab\",\n      \"pmids\": [\"25060644\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"CLIC1 promotes internalization of CLT1-fibronectin co-aggregates in angiogenic endothelial cells through ligation of integrin αvβ3, which triggers translocation of CLIC1 to the cell surface. This internalization depends on the LIIQK sequence of CLT1, and CLIC1 depletion/blocking prevents uptake of CLT1-fibronectin aggregates and endothelial cytotoxicity.\",\n      \"method\": \"Co-localization in vivo; antibody blocking; integrin αvβ3 ligation; in vitro internalization assay; in vivo tumor angiogenesis model\",\n      \"journal\": \"Angiogenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — functional blocking and in vivo co-localization, single lab\",\n      \"pmids\": [\"22203240\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"CLIC1 promotes stability of invadopodia in endothelial and tumor cells embedded in fibrin 3D matrix through β3 integrin (ITGB3)-mediated recruitment into invadopodia, where it induces stress fiber and fibronectin matrix formation. CLIC1 depletion reduces myosin light chain kinase (MYLK) and impairs actomyosin dynamics.\",\n      \"method\": \"3D fibrin matrix invasion assay; CLIC1 siRNA knockdown; β3 integrin depletion; MYLK expression analysis; in vivo metastasis assay\",\n      \"journal\": \"Molecular cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA knockdown with mechanistic protein interaction (ITGB3, MYLK) and in vivo validation, single lab\",\n      \"pmids\": [\"25205595\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"CLIC1 membrane localization and function is constitutive in glioblastoma cancer stem cells (CSCs) but not in normal mesenchymal stem cells. During G1-S transition in CSCs, CLIC1 membrane activity is temporally linked to ROS accumulation and cytoplasmic alkalinization. Inhibiting CLIC1-mediated chloride current prevents both intracellular ROS accumulation and pH changes, arresting CSCs in G1.\",\n      \"method\": \"Patch clamp electrophysiology; ROS measurement; cytoplasmic pH measurement; cell cycle analysis; pharmacological and antibody inhibition in CSCs vs. MSCs\",\n      \"journal\": \"Molecular cancer therapeutics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — electrophysiology plus ROS/pH imaging with cell cycle readout, establishes temporal coupling, single lab\",\n      \"pmids\": [\"30135216\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Matrix stiffness induces CLIC1 expression in pancreatic cancer through Wnt/β-catenin/TCF4 signaling. CLIC1 stabilizes HIF1α by reducing hydroxylation via ROS, thereby promoting the Warburg effect and glycolytic metabolism to drive tumor proliferation.\",\n      \"method\": \"Clinical samples, cellular and bioinformatics approaches; Wnt/β-catenin/TCF4 pathway analysis; HIF1α hydroxylation assay; glycolysis measurements; matrix stiffness manipulation\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mechanistic pathway placement with multiple approaches, single study\",\n      \"pmids\": [\"39154343\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"In polarized columnar epithelia, membrane-inserted CLIC1 localizes to a sub-apical compartment overlapping megalin and the sodium-phosphate cotransporter NaPi-II (markers of the apical endocytic/recycling compartment) in renal proximal tubule cells. Digitonin extraction distinguishes membrane-inserted from soluble cytoplasmic CLIC1; in T84 colon cancer cells, membrane CLIC1 is in a sub-apical intracellular compartment enhanced by forskolin-induced apical membrane traffic.\",\n      \"method\": \"Digitonin extraction fractionation; immunofluorescence confocal microscopy; comparison to endocytic/recycling markers; forskolin stimulation\",\n      \"journal\": \"BMC cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — subcellular fractionation plus immunofluorescence with functional context (apical membrane recycling), single lab\",\n      \"pmids\": [\"17326840\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Insulin stimulation of human hematopoietic cells induces a change in the subnuclear localization pattern of CLIC1 without altering total CLIC1 protein levels (discrepancy between 1-DE and 2-DE results suggesting a qualitative/conformational change rather than abundance change).\",\n      \"method\": \"2-DE proteomics; Western blot; immunofluorescence subnuclear localization after insulin stimulation\",\n      \"journal\": \"American journal of physiology. Endocrinology and metabolism\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — discrepancy between methods acknowledged by authors, single lab, subnuclear localization without defined functional consequence\",\n      \"pmids\": [\"15827065\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"CLIC1 binds to MYC protein (shown by co-immunoprecipitation) and enhances MYC transcriptional activity on downstream target genes without altering MYC expression levels. A positive feedback regulatory loop exists in which MYC promotes CLIC1 expression and CLIC1 in turn enhances MYC activity in hepatocellular carcinoma.\",\n      \"method\": \"Co-immunoprecipitation (CLIC1–MYC interaction); luciferase reporter for MYC transcriptional activity; CLIC1 silencing/overexpression; bioinformatics; in vivo xenograft\",\n      \"journal\": \"American journal of cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus functional reporter assay, single lab\",\n      \"pmids\": [\"32905514\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CLIC1 is a metamorphic protein that exists in both a soluble monomeric form (structurally homologous to glutathione S-transferases with a redox-active Cys24/Cys59 disulfide site) and an integral membrane chloride ion channel form; oxidation and acidic pH at membrane surfaces drive a large N-domain conformational rearrangement and oligomerization (~6–8 subunits) that inserts the protein into lipid bilayers where charged residues Arg29 and Lys37 in the transmembrane region gate ion conductance, while this channel activity regulates cell cycle progression (G1/S and G2/M transitions), phagosomal acidification and NADPH oxidase redistribution in macrophages/dendritic cells, NLRP3 inflammasome priming, microglial ROS generation downstream of Aβ, GPCR-coupled Rac1/RhoA small GTPase signaling in endothelial cells, PIP5K1A/C recruitment and PIP2-dependent cell-matrix adhesion for tumor metastasis, and cytokinesis cortical stability through ezrin-mediated plasma membrane–actin bridging.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CLIC1 is a metamorphic protein that converts between a soluble monomeric cytosolic form and an integral-membrane anion channel, coupling cellular redox and pH state to ion conductance across diverse physiological processes [#0, #1]. The soluble form is structurally homologous to the glutathione S-transferase superfamily and carries a redox-active site that binds glutathione [#0]; oxidation drives a reversible monomer-to-dimer transition through an intramolecular Cys24\\u2013Cys59 disulfide that exposes a large hydrophobic surface, with both cysteines required for channel formation [#3]. Acidic pH at membrane surfaces destabilizes the less-stable N-terminal domain (helix \\u03b11), priming the transmembrane region for insertion [#10, #11], after which the N-domain unfolds and inserts into the bilayer as an extended helix and oligomerizes into assemblies of roughly six to eight subunits [#12, #13]. CLIC1 spontaneously inserts into protein-free lipid bilayers to form an anion-selective channel whose conductance, pharmacology and kinetics match those in transfected cells, with charged residues Arg29 and Lys37 in the transmembrane region directly gating conductance and open probability [#1, #2, #16]. Through this regulated channel activity CLIC1 governs cell-cycle progression at the G1/S and G2/M transitions, coupling channel opening to ROS accumulation and cytoplasmic pH change in glioblastoma stem cells [#4, #17, #31]. In macrophages and dendritic cells CLIC1 translocates to the phagosomal membrane to drive phagosomal acidification, proteolysis, antigen presentation and NADPH oxidase redistribution, and supports NLRP3 inflammasome priming and IL-1\\u03b2 maturation [#14, #19, #23, #22]. In microglia CLIC1 is induced by amyloid-\\u03b2 and translocates to the plasma membrane to sustain a feedforward, NADPH oxidase-dependent ROS loop driving neuroinflammatory toxicity [#6, #7]. CLIC1 also acts in GPCR-coupled S1P signaling, mediating Rac1 and RhoA activation and endothelial barrier function [#26], recruits PIP5K1A/C to generate PIP2 microdomains driving integrin-mediated cell-matrix adhesion and metastasis [#25], and, with CLIC4, bridges the plasma membrane to the actin cytoskeleton via ezrin to maintain cortical stability during cytokinesis [#24].\",\n  \"teleology\": [\n    {\n      \"year\": 2000,\n      \"claim\": \"Established that CLIC1 is itself a transmembrane channel constituent with defined topology, settling whether it forms part of the conducting pore rather than merely regulating one.\",\n      \"evidence\": \"Electrophysiology of epitope-tagged NCC27 with side-specific antibody occlusion in transfected CHO-K1 cells\",\n      \"pmids\": [\"10834939\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve the oligomeric stoichiometry of the channel\", \"Mechanism of soluble-to-membrane conversion unaddressed\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Linked CLIC1 conductance to the cell cycle, showing the channel is selectively present in G2/M and that blocking it arrests cells, implying a functional role beyond passive chloride flux.\",\n      \"evidence\": \"Cell-cycle-resolved electrophysiology with pharmacological chloride channel blockade in CHO-K1 cells\",\n      \"pmids\": [\"11195932\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Pharmacological blockers are not CLIC1-specific\", \"Molecular link between conductance and cycle control not defined\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Defined the soluble fold of CLIC1, revealing GST-superfamily homology and a glutaredoxin-like redox site, and nominated the N-domain as the region needing rearrangement for membrane insertion.\",\n      \"evidence\": \"1.4-\\u00c5 X-ray crystallography of soluble CLIC1 in complex with glutathione\",\n      \"pmids\": [\"11551966\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Membrane-inserted structure not determined\", \"No catalytic GST activity demonstrated\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Demonstrated that purified CLIC1 alone can build a functional anion channel by inserting into protein-free bilayers, establishing autonomous, redox- and pH-sensitive channel-forming capacity.\",\n      \"evidence\": \"Chloride efflux from vesicles plus planar bilayer electrophysiology with recombinant protein; comparison to transfected CHO cells\",\n      \"pmids\": [\"11940526\", \"11978800\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Number of subunits per channel inferred indirectly\", \"Trigger for insertion in vivo not identified\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Identified the redox switch controlling the metamorphic transition, showing oxidation forms an intramolecular Cys24\\u2013Cys59 disulfide and a hydrophobic-surface dimer required for channel activity.\",\n      \"evidence\": \"X-ray crystallography of oxidized CLIC1, site-directed mutagenesis, and bilayer/vesicle reconstitution\",\n      \"pmids\": [\"14613939\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How the oxidized dimer assembles into a membrane oligomer not shown\", \"Physiological oxidant in cells not defined here\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Connected CLIC1 to neuroinflammation, showing amyloid-\\u03b2 induces CLIC1 and that its loss blocks TNF-\\u03b1 release and downstream neurotoxicity.\",\n      \"evidence\": \"siRNA knockdown, pharmacological inhibition, electrophysiology and neuron co-culture neurotoxicity assay in rat microglia\",\n      \"pmids\": [\"15190104\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct chain from chloride flux to cytokine release not resolved\", \"Did not address ROS dependency\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Localized the redox-sensitive Cys24 to the extracellular/luminal face near the pore and proposed an intersubunit disulfide regulating conductance.\",\n      \"evidence\": \"Single-channel bilayer recording with C24 mutagenesis, covalent modification and antibody inhibition\",\n      \"pmids\": [\"16339885\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Intersubunit disulfide inferred not directly visualized\", \"Quantitative subunit arrangement unresolved\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Resolved how amyloid-\\u03b2 engages CLIC1, defining a feedforward loop in which NADPH oxidase-derived ROS oxidize and activate membrane CLIC1, which in turn sustains ROS generation.\",\n      \"evidence\": \"Live-cell translocation imaging, siRNA, antibody inhibition, anion substitution and ROS assays in microglia\",\n      \"pmids\": [\"18987185\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular link between chloride conductance and oxidase activity not mechanistically defined\", \"Translocation machinery unknown\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Provided the biophysical basis for pH-triggered insertion, showing acidic pH produces a partially unfolded intermediate with exposed hydrophobic surface centered on helix \\u03b11.\",\n      \"evidence\": \"Equilibrium unfolding, fluorescence spectroscopy and pH titration of CLIC1 stability\",\n      \"pmids\": [\"18850721\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Intermediate characterized in solution, not on membranes\", \"Does not establish insertion kinetics\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Mapped domain-level dynamics, showing domain 1 (the transmembrane region) is intrinsically less stable and further destabilized at acidic pH, reinforcing the priming model.\",\n      \"evidence\": \"Hydrogen-deuterium exchange mass spectrometry at pH 7 and 5.5\",\n      \"pmids\": [\"19650640\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No direct membrane-inserted conformation captured\", \"Single-lab quantitative HDX\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Provided first direct evidence of the large-scale conformational change on membrane contact, showing N- and C-domain separation upon vesicle interaction.\",\n      \"evidence\": \"FRET spectroscopy (Trp35 to native cysteines) comparing solution and vesicle conditions\",\n      \"pmids\": [\"20507120\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Atomic structure of inserted state not obtained\", \"Single-lab FRET model\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Defined the inserted-state architecture, showing the N-domain enters the bilayer as an extended helix (residues 24\\u201346) and oligomerizes to ~6\\u20138 subunits under oxidation.\",\n      \"evidence\": \"Intramolecular and intermolecular FRET with symmetric oligomer fitting in membranes\",\n      \"pmids\": [\"22082111\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Exact subunit count is a fitted estimate\", \"Pore geometry not directly resolved\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Connected CLIC1 surface translocation to integrin signaling, showing \\u03b1v\\u03b23 ligation drives CLIC1 to the surface to internalize CLT1-fibronectin aggregates in angiogenic endothelium.\",\n      \"evidence\": \"Antibody blocking, integrin ligation, internalization assay and in vivo angiogenesis model\",\n      \"pmids\": [\"22203240\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct CLIC1\\u2013integrin physical interaction not established\", \"Single-lab weak-tier evidence\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Provided the first genetic loss-of-function proof of physiological function, showing CLIC1 translocates to phagosomes and is required for acidification, proteolysis and ROS in macrophages, with protection from arthritis in knockouts.\",\n      \"evidence\": \"CLIC1-/- mice, pH-sensitive phagosomal imaging, proteolysis and ROS assays, K/BxN arthritis model\",\n      \"pmids\": [\"22956539\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether phagosomal effect requires channel conductance vs. another activity not separated here\", \"Recruitment mechanism to phagosome unknown\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Identified membrane lipid composition, specifically cholesterol/sterols, as a determinant of CLIC1 insertion and conductance, drawing a parallel to cholesterol-dependent cytolysins.\",\n      \"evidence\": \"Langmuir monolayer measurements and tethered bilayer impedance spectroscopy\",\n      \"pmids\": [\"23457643\", \"27941637\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Sterol effect demonstrated in artificial membranes only\", \"Cellular relevance of sterol dependence untested\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Pinpointed the residues gating conductance, showing K37 controls single-channel conductance and R29 controls voltage-dependent open probability within the transmembrane region.\",\n      \"evidence\": \"Site-directed mutagenesis with Tip-Dip bilayer, cell-attached and whole-cell patch clamp in HEK cells\",\n      \"pmids\": [\"24058583\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not define full pore-lining residue set\", \"Selectivity filter not mapped\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Tied the channel to the G1-S transition and to a druggable target, showing R29-dependent transient insertion is required for G1-S progression and that metformin inhibits the current to arrest glioblastoma stem cells.\",\n      \"evidence\": \"Patch clamp, R29A mutant, cell-cycle analysis and pharmacology in cancer stem cells\",\n      \"pmids\": [\"25361004\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct metformin binding to CLIC1 not shown\", \"Coupling of conductance to cycle machinery undefined\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Established roles in cancer cell physiology and paracrine signaling, linking CLIC1 to regulatory volume decrease, migration/invasion, invadopodia stability via ITGB3/MYLK, and EV-mediated transfer driving tumor growth.\",\n      \"evidence\": \"siRNA/pharmacology with RVD, migration, invasion and 3D invadopodia assays; EV isolation and in vivo engraftment\",\n      \"pmids\": [\"22426742\", \"25205595\", \"26429879\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Channel-dependence of invadopodia/EV effects not fully separated\", \"Single-lab studies\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Placed CLIC1 downstream of cAMP/PKA in neuronal differentiation, showing its current appears only on cAMP elevation and is required for growth cone maintenance and neurite elongation.\",\n      \"evidence\": \"Electrophysiology with PKA inhibition, IAA94 and antibody block in retinal ganglion cell culture\",\n      \"pmids\": [\"25060644\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How PKA enables CLIC1 current not defined\", \"Single-lab evidence\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Generalized the phagosomal role to dendritic cells and connected it to adaptive immunity, showing CLIC1 loss impairs phagosomal acidification, antigen presentation and EAE.\",\n      \"evidence\": \"CLIC1-/- BMDCs, phagosomal pH imaging, proteolysis and antigen presentation assays, in vivo EAE\",\n      \"pmids\": [\"27113959\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism coupling chloride flux to acidification not isolated\", \"Recruitment trigger unknown\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Positioned Trp35 as a membrane anchor, measuring its proximity (~15 \\u00c5) to the bilayer under oxidation and confirming oxidation-dependent membrane association.\",\n      \"evidence\": \"FRET between Trp35 and dansyl-lipid analogue with quenching experiments\",\n      \"pmids\": [\"27299171\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single residue probe; full insertion path not mapped\", \"Single-lab FRET\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Dissected the inflammasome and oxidase contributions, showing CLIC1 supports NLRP3 priming/IL-1\\u03b2 maturation and is required for NADPH oxidase redistribution to the plasma membrane rather than acting solely as a surface chloride channel.\",\n      \"evidence\": \"siRNA with IL-1\\u03b2 ELISA and ASC speck imaging; CLIC1-null mice with superoxide assays and oxidase redistribution imaging\",\n      \"pmids\": [\"28576828\", \"28275112\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis for oxidase redistribution dependence on CLIC1 unknown\", \"Nuclear translocation role in priming undefined\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Defined a cytoskeletal scaffolding function in cytokinesis, showing CLIC1 with CLIC4 bridges plasma membrane and actin via ezrin and that loss causes furrow regression and multinucleation.\",\n      \"evidence\": \"CLIC4/CLIC1 knockout, live imaging, Co-IP of ezrin/anillin/ALIX and functional-residue mutagenesis\",\n      \"pmids\": [\"31879279\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether CLIC1's contribution requires channel activity not separated\", \"Direct CLIC1 binding partner at furrow vs. CLIC4 not fully resolved\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Identified a nuclear/transcriptional partnership, showing CLIC1 binds MYC and amplifies its transcriptional activity in a positive feedback loop in hepatocellular carcinoma.\",\n      \"evidence\": \"Co-IP, luciferase reporter, CLIC1 silencing/overexpression and xenograft\",\n      \"pmids\": [\"32905514\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single Co-IP without reciprocal structural validation\", \"Mechanism by which CLIC1 enhances MYC activity unknown\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Resolved a membrane-signaling mechanism for metastasis and GPCR responses, showing CLIC1 recruits PIP5K1A/C to generate PIP2 microdomains for integrin adhesion and mediates S1P-driven Rac1/RhoA activation and endothelial barrier function non-redundantly with CLIC4.\",\n      \"evidence\": \"Proteomics/Co-IP, PIP2 imaging and in vivo metastasis; live imaging, siRNA, Rac1/RhoA assays, barrier assays and rescue in endothelial cells\",\n      \"pmids\": [\"33079727\", \"33879602\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How CLIC1 selects PIP5K isoforms vs. GTPase effectors not defined\", \"Channel-activity requirement for these scaffolding roles unresolved\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Linked mechanical signaling to metabolism, showing matrix stiffness induces CLIC1 via Wnt/\\u03b2-catenin/TCF4 and CLIC1 stabilizes HIF1\\u03b1 through ROS to promote the Warburg effect.\",\n      \"evidence\": \"Clinical samples, pathway analysis, HIF1\\u03b1 hydroxylation and glycolysis assays with matrix stiffness manipulation in pancreatic cancer\",\n      \"pmids\": [\"39154343\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct CLIC1 effect on HIF1\\u03b1 hydroxylase activity not biochemically resolved\", \"Single study\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved which CLIC1 functions strictly require ion conductance versus a redox/scaffolding activity, and no atomic-resolution structure of the membrane-inserted oligomeric channel has been determined.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No high-resolution structure of the inserted channel\", \"Conductance-dependent vs. scaffolding roles not systematically separated across cell types\", \"Cellular machinery directing translocation to specific membranes unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005215\", \"supporting_discovery_ids\": [1, 2, 5, 16]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [1, 3, 13]},\n      {\"term_id\": \"GO:0140299\", \"supporting_discovery_ids\": [3, 8, 10]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [24, 25]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [12, 15, 21]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [4, 5, 7, 25]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [7, 14, 19]},\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [14, 19, 33]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [5, 22, 35]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [9, 24, 30]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [4, 17, 31]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [14, 19, 22, 23]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [25, 26, 28]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [25, 27, 32]},\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [7, 31, 32]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"CLIC4\", \"EZR\", \"PIP5K1A\", \"PIP5K1C\", \"ITGB3\", \"MYC\", \"ANLN\", \"PDCD6IP\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}