{"gene":"CISD1","run_date":"2026-06-09T22:57:18","timeline":{"discoveries":[{"year":2003,"finding":"mitoNEET (CISD1) was identified as a novel mitochondrial binding target of pioglitazone by photoaffinity cross-linking; it is a <17-kDa protein located in the mitochondrial fraction and was found to associate with a complex of solubilized mitochondrial proteins including the trifunctional beta-oxidation protein.","method":"Photoaffinity cross-linking with tritiated pioglitazone, mass spectrometry, NH2-terminal sequencing, Western blot, size exclusion chromatography, solid-phase pulldown","journal":"American journal of physiology. Endocrinology and metabolism","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct biochemical identification by photoaffinity cross-linking, MS, and N-terminal sequencing in a foundational study; replicated by multiple subsequent labs","pmids":["14570702"],"is_preprint":false},{"year":2007,"finding":"mitoNEET is an integral outer mitochondrial membrane protein with an N-terminal transmembrane anchor and a cytoplasm-facing CDGSH domain containing 1.6 mol Fe per mole protein; cardiac mitochondria from mitoNEET-null mice show reduced oxidative capacity, establishing its role in controlling maximal mitochondrial respiratory rates.","method":"Bioinformatic analysis, iron quantification, subcellular fractionation/localization, mitoNEET-null mouse model with mitochondrial respiration assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct localization, iron measurement, and KO mouse with defined respiratory phenotype; foundational paper replicated across labs","pmids":["17376863"],"is_preprint":false},{"year":2007,"finding":"X-ray crystal structure (1.5 Å) of mitoNEET revealed a unique dimeric 'NEET fold' in which each protomer coordinates a 2Fe-2S cluster; pioglitazone binding stabilizes the protein against 2Fe-2S cluster release.","method":"X-ray crystallography at 1.5 Å, ligand-stability assays with pioglitazone","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Strong — atomic-resolution crystal structure with functional validation of drug stabilization; independently confirmed by three crystal structures published the same year","pmids":["17766440"],"is_preprint":false},{"year":2007,"finding":"The 2Fe-2S cluster of mitoNEET is redox-active and pH-labile; mass spectrometry confirmed loss of 2Fe and 2S upon cofactor extrusion; spectroscopy showed the cluster is coordinated by Cys-3 and His-1 residues, with protonation of the His ligand triggering cluster release, suggesting a role in Fe-S cluster shuttling and/or redox reactions.","method":"Optical spectroscopy, electron paramagnetic resonance (EPR), mass spectrometry, recombinant mutagenesis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — multiple orthogonal biophysical methods (EPR, optical, MS) with mutagenesis in a single study; replicated across many subsequent papers","pmids":["17584744"],"is_preprint":false},{"year":2007,"finding":"Crystal structure of human mitoNEET soluble domain (residues 32–108) at 1.8 Å revealed an intertwined homodimer with a [2Fe-2S] cluster coordinated by three cysteines and one histidine (novel CCCH-type motif), and UV-visible spectra indicated redox (oxidized/reduced) states.","method":"X-ray crystallography at 1.8 Å, UV-visible absorption spectroscopy","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Strong — independent crystal structure confirming CCCH coordination motif; consistent with two other structures published simultaneously","pmids":["17766439"],"is_preprint":false},{"year":2007,"finding":"Crystal structure of the cytoplasmic mitoNEET domain at high resolution confirmed [2Fe-2S] cluster coordination by Cys-72, Cys-74, Cys-83, and His-87; homodimerization is mediated by hydrophobic interactions and hydrogen bonds; His-87 is solvent-exposed and proposed to mediate interaction with other proteins.","method":"X-ray crystallography, analytical ultracentrifugation (homodimer in solution and crystal)","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — high-resolution crystal structure, third independent confirmation of cluster coordination","pmids":["17905743"],"is_preprint":false},{"year":2007,"finding":"CISD1 (mitoNEET) mRNA is down-regulated in cystic fibrosis cells and restored upon ectopic CFTR expression; a CISD1-GFP chimera localizes to mitochondria, demonstrating CFTR-dependent regulation of this mitochondrial protein.","method":"RT-PCR in cell lines with/without CFTR, CFTR inhibitors (glibenclamide, CFTR(inh)-172), cAMP stimulation, live-cell fluorescence imaging of CISD1-GFP","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct GFP localization and pharmacological manipulation in multiple cell lines, single lab","pmids":["18047834"],"is_preprint":false},{"year":2009,"finding":"Thiazolidinedione drug binding shifts the midpoint potential of the mitoNEET [2Fe-2S] cluster by more than 100 mV (from ~0 to −100 mV at pH 7); His87Cys mutation abolishes TZD's ability to affect the redox potential, indicating His87 mediates communication between the drug binding site and the Fe-S center.","method":"Protein film voltammetry (PFV), site-directed mutagenesis (H87C)","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — direct electrochemical measurement of redox potential with mutagenesis; single lab but two orthogonal approaches (PFV + mutagenesis)","pmids":["19791753"],"is_preprint":false},{"year":2009,"finding":"Resonance Raman spectra of mitoNEET show pH-dependent changes in the Fe-His87 region (250–300 cm⁻¹) absent in the H87C mutant, demonstrating that the Fe-N(His87) interaction is modulated within physiological pH range and that this modulation is coupled to cluster lability.","method":"Resonance Raman spectroscopy, comparison with H87C mutant","journal":"Biochemistry","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — direct spectroscopic characterization with mutagenesis control, single lab","pmids":["19388667"],"is_preprint":false},{"year":2010,"finding":"NADPH binds to homodimeric mitoNEET (at residues K55 and H58) and destabilizes the [2Fe-2S] clusters, promoting their release at pH ≤ 7.0 by disrupting inter-subunit interactions with H87′ and R73′.","method":"NMR spectroscopy, isothermal titration calorimetry, UV-visible absorption, circular dichroism","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — multiple orthogonal biophysical methods (NMR, ITC, UV-vis, CD) identifying binding site and functional consequence, single lab","pmids":["20932062"],"is_preprint":false},{"year":2010,"finding":"EPR analysis of reduced mitoNEET confirmed valence-localized [2Fe-2S] cluster with Fe²⁺ at the His-bound iron; inter-cluster dipolar coupling is detectable and the histidine N-delta coordinates to iron with A_iso = −6.25 MHz.","method":"Multifrequency/multitechnique EPR (CW, ESEEM, ENDOR, HYSCORE), ¹⁵N-labeling","journal":"Journal of the American Chemical Society","confidence":"High","confidence_rationale":"Tier 1 / Moderate — multiple orthogonal EPR techniques with isotope labeling on purified recombinant protein, single lab","pmids":["20099820"],"is_preprint":false},{"year":2011,"finding":"mitoNEET transfers its [2Fe-2S] cluster to apo-ferredoxin in a unidirectional, second-order reaction; His87 is required for cluster transfer (H87C mutant inhibits transfer), while the Lys55Glu mutation does not; pioglitazone inhibits iron transfer from mitoNEET to mitochondria in HEK293 cells.","method":"UV-VIS spectroscopy, native-PAGE, mitochondrial iron detection assay in cells, site-directed mutagenesis (H87C, K55E)","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution of cluster transfer with mutagenesis and cellular validation; multiple orthogonal methods","pmids":["21788481"],"is_preprint":false},{"year":2011,"finding":"Crystal structure of H87C mitoNEET at 1.7 Å showed that replacing His87 with Cys stabilizes the cluster ~6-fold and decreases the redox potential ~300 mV; Cys87 displays two conformations; structural changes are localized to the cluster-binding region.","method":"X-ray crystallography at 1.7 Å, spectroscopic cluster stability assays","journal":"Acta crystallographica. Section D, Biological crystallography","confidence":"High","confidence_rationale":"Tier 1 / Moderate — high-resolution crystal structure of mutant with biophysical characterization","pmids":["21636891"],"is_preprint":false},{"year":2012,"finding":"NADPH inhibits [2Fe-2S] cluster transfer from mitoNEET to an apo-acceptor protein (K_i = 200 µM); the conserved Asp-84 residue in the CDGSH domain is required for NADPH-dependent inhibition of cluster transfer.","method":"In vitro cluster transfer assay, site-directed mutagenesis (D84 variants), inhibition kinetics","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with defined mutagenesis establishing mechanistic requirement; single lab, multiple methods","pmids":["22351774"],"is_preprint":false},{"year":2012,"finding":"mitoNEET overexpression in adipocytes inhibits mitochondrial iron transport into the matrix, reducing electron transport chain activity, lowering β-oxidation rates, mitochondrial membrane potential, and ROS production; mitoNEET knockdown enhances mitochondrial respiratory capacity through increased matrix iron.","method":"Transgenic mouse overexpression, shRNA knockdown, mitochondrial iron measurements, metabolic/respiration assays","journal":"Nature medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal gain- and loss-of-function in vivo with direct measurement of mitochondrial iron and respiration; replicated concept across multiple papers","pmids":["22961109"],"is_preprint":false},{"year":2013,"finding":"mitoNEET forms a covalent disulfide bond with glutamate dehydrogenase 1 (GDH1) and acts as an activator of GDH1; specific cysteine residues participating in the disulfide bond were identified by proteomics.","method":"Protein pulldown, SDS-PAGE, mass spectrometry/proteomics identification of disulfide bond","journal":"Biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — co-IP/pulldown with MS identification of covalent bond, single lab, single study","pmids":["24295216"],"is_preprint":false},{"year":2013,"finding":"shRNA suppression of mitoNEET in breast cancer cells causes reduced cell proliferation, decreased mitochondrial performance, uncontrolled accumulation of mitochondrial iron and ROS, and activation of autophagy.","method":"shRNA knockdown, cell proliferation assays, mitochondrial iron/ROS imaging, autophagy assays, xenograft tumor model","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KD with multiple orthogonal readouts (iron, ROS, autophagy, tumor growth) in vitro and in vivo","pmids":["23959881"],"is_preprint":false},{"year":2013,"finding":"TNFα-induced necroptosis in hepatocytes requires mitoNEET: fructose/ethanol overexpression of CISD1 primes cells for TNFα cytotoxicity; TNFα promotes translocation of a Stat3-Grim-19 complex to mitochondria, which binds mitoNEET and triggers rapid release of its 2Fe-2S cluster, causing mitochondrial iron accumulation, ROS surge, and cell death.","method":"Co-immunoprecipitation (Stat3-Grim-19 with mitoNEET), Western blot, mitochondrial iron measurement, L929 cell and hepatocyte necroptosis models","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP demonstrating protein complex, functional cluster release assay, two cell model systems; single lab","pmids":["24357718"],"is_preprint":false},{"year":2014,"finding":"mitoNEET Fe-S assembly strictly depends on mitochondrial ISC machinery (not CIA or CIAPIN1); augmenter of liver regeneration (ALR), a Mia40-dependent protein, is specifically required for mitoNEET maturation; holo-mitoNEET can repair oxidatively damaged Fe-S of IRP1/cytosolic aconitase, identifying IRP1 as a physiological acceptor of the mitoNEET Fe-S cluster.","method":"Genetic epistasis (siRNA depletion of ISC/CIA components), in vitro Fe-S assembly assay, cluster transfer to IRP1 after nitrosative stress, in vivo aconitase activity assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — pathway epistasis combined with in vitro reconstitution and cellular functional readout identifying both upstream biogenesis pathway and downstream acceptor protein","pmids":["25012650"],"is_preprint":false},{"year":2014,"finding":"The [2Fe-2S] clusters of mitoNEET are reduced by glutathione/cysteine/DTT and can be reversibly oxidized by H₂O₂ without cluster disruption; human glutathione reductase efficiently reduces mitoNEET clusters via its redox-active disulfide, whereas rat thioredoxin reductase (selenocysteine-containing) has no such activity.","method":"In vitro biochemical reduction/oxidation assays, inhibitor (N-ethylmaleimide) studies, UV-visible spectroscopy","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — direct in vitro biochemical assays with multiple reductants and inhibitor controls, single lab","pmids":["24403080"],"is_preprint":false},{"year":2015,"finding":"Reduction of mitoNEET [2Fe-2S] clusters by human glutathione reductase proceeds via the enzyme's redox-active disulfide in an NADPH-dependent manner; N-ethylmaleimide abolishes this activity; rat thioredoxin reductase (selenocysteine) has negligible activity.","method":"In vitro enzyme assays, inhibitor studies, comparative enzyme analysis","journal":"Free radical biology & medicine","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — direct in vitro enzymatic assay with mechanistic controls, single lab, confirms prior work","pmids":["25645953"],"is_preprint":false},{"year":2015,"finding":"MAD-28 (a cluvenone derivative) binds mitoNEET and breaks the coordinative bond between His87 and the cluster Fe, destabilizing the 2Fe-2S cluster; cancer cells with suppressed mitoNEET are less susceptible to MAD-28, confirming NEET proteins as direct drug targets.","method":"Docking analysis, cell-based functional assays, shRNA suppression epistasis, mitochondrial respiration and iron measurements","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis (shRNA) confirming target engagement combined with docking and functional assays; single lab","pmids":["25762074"],"is_preprint":false},{"year":2016,"finding":"CISD1 (mitoNEET) negatively regulates ferroptosis in hepatocellular carcinoma cells by protecting against intramitochondrial lipid peroxidation; CISD1 expression is iron-dependently upregulated by erastin; genetic inhibition of CISD1 increases iron-mediated mitochondrial lipid peroxidation; pioglitazone-mediated stabilization of the Fe-S cluster inhibits mitochondrial iron uptake and lipid peroxidation.","method":"shRNA/siRNA knockdown, pioglitazone treatment, mitochondrial iron and lipid peroxidation measurements, erastin-induced ferroptosis model","journal":"Biochemical and biophysical research communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — loss-of-function and pharmacological gain-of-function with direct mechanistic readouts (iron, lipid peroxidation, ferroptosis); replicated by multiple subsequent papers","pmids":["27510639"],"is_preprint":false},{"year":2016,"finding":"Only the oxidized [2Fe-2S]²⁺ state of mitoNEET is active in cluster transfer to acceptor proteins; the reduced [2Fe-2S]⁺ state is a dormant form resistant to cluster loss; dioxygen is not required for transfer and does not affect transfer rate; mitoNEET thus uses an iron-based redox switch to regulate cluster transfer.","method":"Controlled spectroscopic reduction/oxidation, anaerobic cluster transfer assays, UV-vis and EPR spectroscopy","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — rigorous in vitro reconstitution with multiple orthogonal spectroscopic methods under tightly controlled conditions; single lab","pmids":["26887944"],"is_preprint":false},{"year":2016,"finding":"β-cell-specific overexpression of mitoNEET causes hyperglycemia via activation of a Parkin-dependent mitophagic pathway with vacuole and mitophagosome formation; α-cell-specific mitoNEET induction leads to hypoglycemia and protective effects on β-cells.","method":"Cell-type-specific transgenic mouse models, histology, electron microscopy of mitophagosomes, glucose tolerance tests","journal":"Diabetes","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — cell-type-specific transgenic gain-of-function models linking mitoNEET to Parkin-dependent mitophagy pathway in vivo; single lab","pmids":["26895793"],"is_preprint":false},{"year":2016,"finding":"Flavin mononucleotide (FMN) but not FAD has a specific interaction with mitoNEET (EPR evidence); reduced flavin nucleotides rapidly reduce mitoNEET [2Fe-2S] clusters as electron shuttles, with one FMN molecule reducing ~100 mitoNEET clusters in 4 min.","method":"EPR spectroscopy, UV-vis absorption, flavin reductase/NADH assay system, molecular docking","journal":"Free radical biology & medicine","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — EPR and in vitro enzymatic assays demonstrating specific FMN interaction and catalytic efficiency; single lab","pmids":["27923678"],"is_preprint":false},{"year":2017,"finding":"mitoNEET is a redox enzyme that catalyzes electron transfer from FMNH₂ to oxygen or ubiquinone via its [2Fe-2S] clusters; ubiquinone-2 is a more efficient oxidant than O₂; pioglitazone inhibits this electron transfer activity by forming a unique complex with mitoNEET and FMNH₂.","method":"In vitro reconstituted electron transfer assay (FMN/NADH/flavin reductase system), UV-vis spectroscopy, anaerobic and aerobic conditions","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution of enzymatic activity with multiple electron acceptors and drug inhibition; single lab with multiple orthogonal conditions","pmids":["28461337"],"is_preprint":false},{"year":2017,"finding":"mitoNEET KO cells show reduced frequency of intermitochondrial junctions and decreased total mitochondrial volume (reducing cellular respiration); mitoNEET overexpression strongly increases intermitochondrial contacts and causes mitochondrial clustering; a mitoNEET mutant resistant to oxidative stress increases H₂O₂ resistance of the mitochondrial network.","method":"3D-EM reconstruction, thin-section EM, respiration assays in KO cells, re-expression rescue experiments","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — KO, rescue, gain-of-function with direct EM quantification of intermitochondrial junctions and functional respiration assay","pmids":["28716905"],"is_preprint":false},{"year":2017,"finding":"mitoNEET and NAF-1 (CISD2) directly interact in mammalian cells; mitoNEET can transfer its [2Fe-2S] clusters to NAF-1 in vitro; single and double shRNA knockdown establishes they function in the same cellular pathway controlling mitochondrial iron and ROS.","method":"Yeast two-hybrid, in vivo bimolecular fluorescence complementation (BiFC), direct coupling analysis, in vitro cluster transfer assay, shRNA knockdown with iron/ROS imaging","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — multiple orthogonal methods (Y2H, BiFC, in vitro cluster transfer) demonstrating direct protein interaction and functional epistasis; single lab","pmids":["28426722"],"is_preprint":false},{"year":2017,"finding":"The cytosolic electron donor complex Ndor1/anamorsin (CIA machinery) reduces mitoNEET [2Fe-2S] clusters via transient protein-protein interaction, bringing their clusters into proximity; this provides a direct mechanistic link between CIA machinery and the mitoNEET cluster transfer/repair pathway.","method":"UV-vis and NMR spectroscopy in vitro, complex formation characterization","journal":"Journal of the American Chemical Society","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — direct in vitro spectroscopic evidence of transient complex and electron transfer; single lab, single study","pmids":["28648056"],"is_preprint":false},{"year":2017,"finding":"Loss of mitoNEET in striatum results in mitochondrial dysfunction (elevated ROS, reduced ATP production), loss of striatal dopamine and tyrosine hydroxylase, shortened gait, and reduced rotarod performance, consistent with a Parkinson's disease-like phenotype.","method":"CISD1 knockout mice, isolated mitochondria ROS and ATP assays, immunohistochemistry for TH/dopamine, gait analysis, rotarod","journal":"ACS chemical neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO mouse with multiple defined neurochemical and behavioral readouts; single lab","pmids":["28880525"],"is_preprint":false},{"year":2018,"finding":"pH regulates mitoNEET cluster transfer activity around physiological cytosolic pH; mitoNEET is highly resistant to H₂O₂ compared to other Fe-S cluster transfer proteins (ISCU, SufB); only one of two mitoNEET clusters is transferred when the other is decomposed; direct cluster transfer to apo-ferredoxin (not via intermediary) is confirmed.","method":"In vitro cluster transfer assays at varying pH, H₂O₂ resistance assays vs. ISCU/SufB, biophysical approaches (native MS, spectroscopy)","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — multiple complementary biochemical and biophysical methods in a single study; single lab but rigorous controls","pmids":["30204426"],"is_preprint":false},{"year":2018,"finding":"Electron transfer kinetics of mitoNEET: FMNH₂ rapidly reduces [2Fe-2S] clusters; O₂ oxidizes reduced clusters at ~6 M⁻¹s⁻¹; ubiquinone-2 oxidizes them at ~3×10³ M⁻¹s⁻¹, ~500-fold faster than O₂, supporting ubiquinone as the intrinsic electron acceptor in mitochondria.","method":"Stopped-flow kinetics, UV-vis spectroscopy under anaerobic and aerobic conditions","journal":"Free radical biology & medicine","confidence":"High","confidence_rationale":"Tier 1 / Moderate — direct kinetic measurement of electron transfer rates with multiple electron acceptors under defined conditions; single lab, extends prior enzymatic work","pmids":["29704621"],"is_preprint":false},{"year":2019,"finding":"Oxidized mitoNEET gates VDAC1 in a redox-dependent manner; mitoNEET binds VDAC1 at the DIDS-sensitive site in vitro; the VDAC inhibitor DIDS prevents both mitoNEET–VDAC1 binding in vitro and mitoNEET-dependent mitochondrial iron accumulation in situ, indicating mitoNEET closes VDAC1 to regulate metabolite flow.","method":"In vitro binding assay, DIDS inhibitor studies in cells and in vitro, mitochondrial iron accumulation assay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct in vitro protein–protein interaction with VDAC1 plus cellular functional validation using specific inhibitor; multiple orthogonal approaches","pmids":["31527235"],"is_preprint":false},{"year":2019,"finding":"AGBE (glycogen branching enzyme) binds specifically to holo-IRP1 (aconitase) and to mitoNEET; this interaction facilitates nuclear translocation of holo-IRP1, demonstrating mitoNEET as part of a complex regulating iron-dependent gene expression.","method":"Co-immunoprecipitation, genetic studies in Drosophila, nuclear fractionation","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP identifying complex and nuclear fractionation showing functional consequence; Drosophila model organism with ortholog relevance","pmids":["31784520"],"is_preprint":false},{"year":2019,"finding":"Crystal structure of mitoNEET soluble domain bound to sulfonamide ligand furosemide was determined; structural basis of drug binding site on mitoNEET was elucidated for rational drug design.","method":"X-ray crystallography of mitoNEET–furosemide complex","journal":"Communications chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure of protein–ligand complex; single study but atomic-resolution structural data","pmids":["32382661"],"is_preprint":false},{"year":2020,"finding":"FMN (and lumiflavin) forms a specific covalent complex with mitoNEET under blue light exposure near the [2Fe-2S] cluster; lumichrome (FMN analog lacking ribityl and phosphate) cannot mediate cluster redox transition and acts as a competitive inhibitor, mapping the FMN binding site.","method":"EPR spectroscopy, UV-vis, blue-light cross-linking, FMN analog comparison","journal":"Free radical biology & medicine","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — photochemical trapping and EPR fingerprinting of FMN binding site; single lab","pmids":["32445867"],"is_preprint":false},{"year":2020,"finding":"Pioglitazone-mediated neuroprotection after TBI requires mitoNEET: pioglitazone mitigates Ca²⁺-induced mitochondrial dysfunction and provides neuroprotection in WT mice but not in mitoNEET-null mice, establishing mitoNEET as the necessary mediator of pioglitazone's neuroprotective effects.","method":"WT and CISD1-null mouse TBI model, Ca²⁺-induced mitochondrial dysfunction assay, neuroprotection endpoints","journal":"Experimental neurology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — genetic necessity demonstrated by KO mouse model under defined conditions; single lab, multiple functional readouts","pmids":["32057797"],"is_preprint":false},{"year":2020,"finding":"Single-molecule AFM force spectroscopy shows the Fe-N(His87) bond is the mechanically weakest point of the [2Fe-2S] cluster and its rupture can be independent of cluster break, enabling multiple unfolding pathways and a Fe₂S₂(Cys)₃ intermediate.","method":"AFM-based single-molecule force spectroscopy (AFM-SMFS)","journal":"Analytical chemistry","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — novel single-molecule technique revealing bond-level rupture pathway; single lab, single study, specialized method","pmids":["33048522"],"is_preprint":false},{"year":2021,"finding":"Cardiac-specific deletion of CISD1 results in mitochondrial morphological abnormalities and elevated ROS at early time points, progressing to cardiac dysfunction at 12 months and heart failure by 16 months, demonstrating mitoNEET is required for maintaining cardiac mitochondrial integrity during aging.","method":"Cardiac-specific CISD1 KO mouse on C57BL/6J background, echocardiography, electron microscopy, ROS measurements","journal":"Communications biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — tissue-specific KO with longitudinal functional and structural readouts; single lab","pmids":["33514783"],"is_preprint":false},{"year":2021,"finding":"Pioglitazone stabilizes the labile Fe(III)-N(His87) bond of the mitoNEET cluster ~10-fold (by AFM-SMFS), while reducing dissociation of other protein regions only ~3-fold; this Fe-N bond stabilization is the primary mechanism by which pioglitazone inhibits metal cluster transfer.","method":"AFM-based single-molecule force spectroscopy with a mitoNEET homodimer polyprotein construct","journal":"The journal of physical chemistry letters","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — novel single-molecule approach with quantitative bond-level resolution, single lab, single study","pmids":["33856229"],"is_preprint":false},{"year":2022,"finding":"mitoNEET binds pyridoxal phosphate (PLP) specifically at Lys55 and catalyzes transamination of cysteine and 2-oxoglutarate to form 3-mercaptopyruvate and glutamate, demonstrating cysteine transaminase enzymatic activity.","method":"PLP binding assay (Lys55-specific), in vitro transamination assay with amino acid substrates","journal":"ACS chemical biology","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — direct in vitro enzymatic assay identifying novel activity, single lab, single study; requires independent replication","pmids":["36194135"],"is_preprint":false},{"year":2022,"finding":"Pharmacological inhibition of mitoNEET (NL-1 or rosiglitazone) induces PINK1-Parkin-mediated mitophagy; mitoNEET inhibition promotes Pink1/Parkin accumulation, mitochondria-lysosome crosstalk, and PGC-1α expression.","method":"NL-1 pharmacological inhibition, shRNA knockdown, Western blot of mitophagy markers (Pink1, Parkin, LC3), lysosome imaging in RAW264.7 cells","journal":"BMB reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological and genetic inhibition with defined pathway markers; single lab but orthogonal approaches","pmids":["35725011"],"is_preprint":false},{"year":2024,"finding":"CISD1 accumulation in Pink1 and parkin mutant Drosophila forms aberrant disulfide-linked dimers incapable of coordinating the Fe-S cluster; elevated Cisd blocks mitophagy and impairs autophagy flux; genetic or pharmacological reduction of Cisd/CISD1 rescues locomotion, lifespan, dopamine levels, and mitochondrial ultrastructure in Pink1/parkin mutants, placing CISD1 downstream of PINK1 in the mitophagy pathway.","method":"Drosophila Pink1/parkin mutant genetics, human iPSC dopaminergic neurons, disulfide bond detection, mitophagy/autophagy flux assays, NL-1/rosiglitazone pharmacology, epistasis by genetic rescue","journal":"Molecular neurodegeneration","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis in multiple model systems (Drosophila, human neurons), multiple orthogonal assays, pharmacological validation; strong mechanistic placement of CISD1 downstream of PINK1","pmids":["38273330"],"is_preprint":false},{"year":2024,"finding":"In Pink1 mutant flies and PINK1-mutant patient dopaminergic neurons, CISD1 forms aberrant disulfide-linked homodimers unable to bind the Fe-S cluster; overexpression of cluster-binding-deficient CISD1 worsens Pink1-mutant phenotypes, while complete loss of Cisd rescues all Pink1-mutant phenotypes, indicating that iron-depleted CISD1 is the pathogenic species operating downstream of PINK1.","method":"Drosophila genetics, human patient-derived dopaminergic neurons, disulfide dimer characterization, gain/loss-of-function with Fe-S binding mutant, behavioral and lifespan assays","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple model systems (fly, human neurons), structural characterization of pathogenic dimer, Fe-S mutant epistasis establishing mechanism; single lab with comprehensive readouts","pmids":["39159312"],"is_preprint":false},{"year":2025,"finding":"mitoNEET inhibition (NL-1) ameliorates TBI-induced ferroptosis and cognitive dysfunction through activation of the mitoNEET/DHODH (dihydroorotate dehydrogenase) signaling axis; silencing DHODH blocks the anti-ferroptosis effects of NL-1, establishing DHODH as a downstream effector of mitoNEET in ferroptosis defense.","method":"mitoNEET KO and overexpression in TBI mouse models, DHODH siRNA epistasis, NL-1 pharmacology, ferroptosis markers, cognitive testing","journal":"Experimental neurology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis (DHODH siRNA reversing NL-1 effects) with gain/loss-of-function; single lab, single study","pmids":["40189124"],"is_preprint":false}],"current_model":"CISD1/mitoNEET is an outer mitochondrial membrane homodimeric protein that coordinates two redox-active, pH-labile [2Fe-2S] clusters via an unusual 3-Cys/1-His (His87) motif; in its oxidized state it transfers Fe-S clusters to acceptor proteins including IRP1/cytosolic aconitase (repairing oxidative damage) and NAF-1/CISD2, a process requiring His87, inhibited by pioglitazone (which stabilizes the Fe-N bond), regulated by NADPH, and reset to the dormant reduced state by the Ndor1/anamorsin CIA complex; it catalyzes electron transfer from FMNH₂ to ubiquinone or O₂ and acts as a redox enzyme controlling mitochondrial energy metabolism; it gates VDAC1 in a redox-dependent manner to regulate metabolite and iron flux across the outer mitochondrial membrane; its accumulation (particularly as disulfide-linked, Fe-S-depleted dimers) blocks PINK1/Parkin-dependent mitophagy and drives neurodegeneration, placing CISD1 downstream of PINK1 in mitochondrial quality control; loss of CISD1 causes mitochondrial dysfunction, ferroptosis via iron-dependent mitochondrial lipid peroxidation, dopaminergic neurodegeneration, and cardiac failure with aging."},"narrative":{"mechanistic_narrative":"CISD1/mitoNEET is an integral outer mitochondrial membrane homodimer that coordinates redox-active, pH-labile [2Fe-2S] clusters and functions as a regulated Fe-S cluster donor and redox enzyme controlling mitochondrial iron handling and energy metabolism [PMID:17376863, PMID:17766440, PMID:22961109]. Each protomer binds its cluster through a unique 3-Cys/1-His motif (Cys72/Cys74/Cys83/His87), and the solvent-exposed His87 is the linchpin of cluster lability: its protonation triggers cluster release, it electrochemically couples the drug-binding site to the iron center, and it is strictly required for cluster transfer to acceptor proteins [PMID:17584744, PMID:17905743, PMID:19791753, PMID:21788481]. Cluster maturation depends on the mitochondrial ISC machinery and augmenter of liver regeneration (ALR), and once oxidized—only the [2Fe-2S]2+ state is transfer-competent—mitoNEET delivers clusters to apo-ferredoxin, repairs oxidatively damaged IRP1/cytosolic aconitase, and transfers clusters to NAF-1/CISD2, while the reduced cluster represents a dormant state reset by the cytosolic Ndor1/anamorsin (CIA) electron-donor complex [PMID:21788481, PMID:25012650, PMID:26887944, PMID:28426722, PMID:28648056]. Cluster transfer is gated by an iron-based redox switch and is tuned by NADPH binding (via Asp84) and by reduction through glutathione reductase, FMN, and flavin shuttles, and mitoNEET itself catalyzes electron transfer from FMNH2 to ubiquinone or O2 [PMID:20932062, PMID:22351774, PMID:24403080, PMID:27923678, PMID:28461337]. Functionally, mitoNEET restricts mitochondrial matrix iron import—gating VDAC1 in a redox-dependent manner—thereby setting respiratory capacity, ROS production, and intermitochondrial junction formation [PMID:22961109, PMID:28716905, PMID:31527235]. Through this control of mitochondrial iron and lipid peroxidation, CISD1 negatively regulates ferroptosis, and pioglitazone—which stabilizes the Fe-N(His87) bond ~10-fold—suppresses iron uptake and lipid peroxidation [PMID:27510639, PMID:33856229]. In mitochondrial quality control, CISD1 acts downstream of PINK1: in Pink1/parkin-mutant flies and patient-derived dopaminergic neurons it accumulates as aberrant disulfide-linked, Fe-S-depleted dimers that block mitophagy, and genetic or pharmacological reduction of CISD1 rescues locomotion, lifespan, dopamine, and mitochondrial ultrastructure [PMID:38273330, PMID:39159312]. Consistent with these roles, loss of CISD1 causes a Parkinson's-like striatal phenotype and age-dependent cardiac failure [PMID:28880525, PMID:33514783].","teleology":[{"year":2003,"claim":"Establishing what mitoNEET is required first identifying it as a discrete mitochondrial protein and a direct drug target, which framed all subsequent mechanistic work.","evidence":"Photoaffinity cross-linking with tritiated pioglitazone, MS, and N-terminal sequencing of mitochondrial fractions","pmids":["14570702"],"confidence":"High","gaps":["Did not define molecular function or cofactor","Association with beta-oxidation machinery not mechanistically resolved"]},{"year":2007,"claim":"Localization, iron content, and a knockout respiratory phenotype defined mitoNEET as an iron-bearing outer-membrane protein controlling mitochondrial respiratory capacity.","evidence":"Bioinformatics, iron quantification, fractionation, and mitoNEET-null mouse respiration assays","pmids":["17376863"],"confidence":"High","gaps":["Molecular basis of respiratory control unresolved","Cofactor chemistry not yet defined"]},{"year":2007,"claim":"Atomic-resolution structures defined the novel NEET fold and the unusual 3-Cys/1-His [2Fe-2S] coordination, and showed pioglitazone stabilizes the cluster — establishing the structural logic of cluster lability and drug action.","evidence":"Three independent crystal structures (1.5–1.8 Å) with ligand-stability and UV-vis assays","pmids":["17766440","17766439","17905743"],"confidence":"High","gaps":["Did not establish in vivo acceptor proteins","Functional consequence of cluster release not shown"]},{"year":2007,"claim":"Spectroscopy established that the cluster is redox-active and pH-labile with His protonation triggering release, the first mechanistic hypothesis for cluster shuttling/redox function.","evidence":"EPR, optical spectroscopy, MS, and recombinant mutagenesis","pmids":["17584744"],"confidence":"High","gaps":["Physiological acceptor unidentified","Whether release reflects transfer or degradation unresolved"]},{"year":2009,"claim":"His87 was shown to electrochemically couple the drug-binding site to the Fe-S center, explaining how thiazolidinediones modulate cluster redox state.","evidence":"Protein film voltammetry and resonance Raman with H87C mutant","pmids":["19791753","19388667"],"confidence":"High","gaps":["Did not establish physiological signal that tunes His87","Downstream consequence of potential shift unaddressed"]},{"year":2010,"claim":"NADPH binding (K55/H58) and valence-localized cluster characterization linked cellular redox metabolites to cluster stability, indicating regulated release.","evidence":"NMR, ITC, UV-vis, CD, and multifrequency EPR with 15N-labeling","pmids":["20932062","20099820"],"confidence":"High","gaps":["In vivo relevance of NADPH-driven destabilization not tested","Acceptor of released cluster still unknown"]},{"year":2011,"claim":"In vitro reconstitution demonstrated unidirectional cluster transfer to apo-ferredoxin requiring His87, defining mitoNEET as a cluster donor and explaining pioglitazone's block of iron transfer.","evidence":"UV-vis, native-PAGE cluster transfer assays, H87C/K55E mutagenesis, cellular mitochondrial iron assays","pmids":["21788481","21636891"],"confidence":"High","gaps":["Physiological acceptor in cells not yet identified","Directionality control mechanism unresolved"]},{"year":2012,"claim":"NADPH inhibition of cluster transfer via Asp84, and reciprocal in vivo manipulation showing mitoNEET limits matrix iron import, connected cofactor chemistry to control of respiration and beta-oxidation.","evidence":"In vitro transfer assays with D84 mutants; transgenic overexpression and shRNA knockdown with mitochondrial iron and metabolic readouts","pmids":["22351774","22961109"],"confidence":"High","gaps":["Transporter coupling iron import to mitoNEET not yet defined","Whether iron control is via cluster transfer or membrane gating unresolved"]},{"year":2014,"claim":"Genetic epistasis identified the ISC machinery and ALR as mitoNEET's maturation pathway and IRP1/cytosolic aconitase as a physiological cluster acceptor for oxidative repair, placing mitoNEET in iron-sulfur homeostasis.","evidence":"siRNA epistasis of ISC/CIA components, in vitro Fe-S assembly, cluster transfer to IRP1 after nitrosative stress","pmids":["25012650"],"confidence":"High","gaps":["How ALR specifically routes clusters to mitoNEET unresolved","In vivo extent of IRP1 repair not quantified"]},{"year":2014,"claim":"Identification of glutathione reductase as a physiological reductant and reversible H2O2 oxidation defined the redox systems that toggle mitoNEET between states.","evidence":"In vitro reduction/oxidation assays with multiple reductants, NEM inhibition, UV-vis","pmids":["24403080","25645953"],"confidence":"High","gaps":["In vivo dominant reductant not established","Thioredoxin system explicitly inactive but alternatives untested"]},{"year":2016,"claim":"Demonstration that only the oxidized cluster is transfer-competent established an iron-based redox switch governing donor activity, with the reduced state dormant.","evidence":"Controlled spectroscopic redox manipulation and anaerobic cluster transfer assays (UV-vis, EPR)","pmids":["26887944"],"confidence":"High","gaps":["Cellular signal setting the switch unresolved","Spatial coupling to acceptor proteins not defined"]},{"year":2016,"claim":"mitoNEET was shown to negatively regulate ferroptosis by limiting mitochondrial iron uptake and lipid peroxidation, linking its iron control to a cell-death program.","evidence":"shRNA/siRNA knockdown, pioglitazone treatment, erastin ferroptosis model with iron and lipid peroxidation readouts","pmids":["27510639"],"confidence":"High","gaps":["Downstream lipid peroxidation effectors not defined in this study","Whether ferroptosis protection requires cluster transfer unresolved"]},{"year":2016,"claim":"Identification of FMN as a specific electron shuttle for cluster reduction set up the redox-enzyme model of mitoNEET.","evidence":"EPR, UV-vis, flavin reductase/NADH assay, docking","pmids":["27923678"],"confidence":"Medium","gaps":["Single-lab finding","Physiological FMN source at the outer membrane not established"]},{"year":2017,"claim":"mitoNEET was defined as a redox enzyme catalyzing electron transfer from FMNH2 to ubiquinone or O2, with kinetics favoring ubiquinone, integrating it into mitochondrial energy metabolism.","evidence":"Reconstituted electron transfer assays and stopped-flow kinetics with multiple acceptors under anaerobic/aerobic conditions","pmids":["28461337","29704621"],"confidence":"High","gaps":["In vivo electron acceptor not directly confirmed","Relationship between enzyme activity and cluster-donor activity unresolved"]},{"year":2017,"claim":"Direct interaction and cluster transfer to NAF-1/CISD2, plus shared iron/ROS pathway, established a functional NEET-protein network, while Ndor1/anamorsin was identified as the reductant resetting the dormant state.","evidence":"Y2H, BiFC, in vitro cluster transfer, shRNA epistasis (CISD2); UV-vis/NMR transient-complex analysis (Ndor1/anamorsin)","pmids":["28426722","28648056"],"confidence":"High","gaps":["Hierarchy between CISD1 and CISD2 cluster handling unresolved","Ndor1/anamorsin interaction shown in vitro only"]},{"year":2017,"claim":"Knockout/rescue and gain-of-function revealed mitoNEET shapes mitochondrial network architecture and intermitochondrial junctions, mechanistically linking it to respiration and oxidative resistance.","evidence":"3D-EM reconstruction, EM quantification, respiration assays in KO/rescue cells with an oxidation-resistant mutant","pmids":["28716905"],"confidence":"High","gaps":["Molecular basis of junction formation unresolved","Whether junctions require cluster transfer untested"]},{"year":2019,"claim":"Demonstration that oxidized mitoNEET binds and gates VDAC1 at the DIDS-sensitive site provided a direct mechanism for redox-dependent control of mitochondrial metabolite and iron flux.","evidence":"In vitro binding, DIDS inhibitor studies in vitro and in cells, mitochondrial iron accumulation assays","pmids":["31527235"],"confidence":"High","gaps":["Structure of the mitoNEET–VDAC1 interface unknown","Quantitative contribution to total metabolite flux unresolved"]},{"year":2022,"claim":"Pharmacological and genetic inhibition linked mitoNEET to PINK1-Parkin mitophagy, suggesting its activity opposes mitophagic turnover.","evidence":"NL-1/rosiglitazone inhibition, shRNA, mitophagy marker Western blots, lysosome imaging","pmids":["35725011"],"confidence":"Medium","gaps":["Direction of regulation (inhibition vs accumulation) needed clarification","Single cell-type system"]},{"year":2024,"claim":"Cross-organism genetics placed CISD1 downstream of PINK1, showing that Fe-S-depleted, disulfide-linked CISD1 dimers are the pathogenic species blocking mitophagy and that reducing CISD1 rescues Pink1/parkin-mutant phenotypes.","evidence":"Drosophila Pink1/parkin genetics, human iPSC and patient dopaminergic neurons, disulfide-dimer characterization, Fe-S-binding-mutant epistasis, NL-1/rosiglitazone pharmacology","pmids":["38273330","39159312"],"confidence":"High","gaps":["Mechanism by which iron-depleted dimers block mitophagy unresolved","Whether the pathogenic dimer forms in mammalian disease tissue in vivo not shown"]},{"year":2025,"claim":"A mitoNEET/DHODH axis was identified as a downstream effector of ferroptosis defense, extending mitoNEET's anti-ferroptotic role to a specific enzymatic partner.","evidence":"mitoNEET KO/overexpression in TBI mice, DHODH siRNA epistasis, NL-1 pharmacology, ferroptosis and cognitive readouts","pmids":["40189124"],"confidence":"Medium","gaps":["Single-lab, single-study finding","Direct physical/biochemical link between mitoNEET and DHODH not established"]},{"year":null,"claim":"How CISD1's distinct biochemical activities — cluster donation, VDAC1 gating, FMNH2-to-ubiquinone electron transfer, and putative cysteine transaminase activity — are integrated and prioritized in vivo, and which underlies its mitophagy and neurodegeneration roles, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model linking enzymatic vs cluster-donor functions to phenotypes","Cysteine transaminase activity (idx 41) awaits independent replication","Mammalian in vivo relevance of the pathogenic disulfide dimer untested"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016491","term_label":"oxidoreductase activity","supporting_discovery_ids":[26,32,25]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[11,18,28]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[33]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[27]}],"localization":[{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[0,1,6]}],"pathway":[{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[14,26]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[22,17,45]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[43,42,24]},{"term_id":"R-HSA-382551","term_label":"Transport of small molecules","supporting_discovery_ids":[33,14]}],"complexes":[],"partners":["CISD2","VDAC1","ACO1","FDX1","GLUD1","DHODH"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9NZ45","full_name":"CDGSH iron-sulfur domain-containing protein 1","aliases":["Cysteine transaminase CISD1","MitoNEET"],"length_aa":108,"mass_kda":12.2,"function":"L-cysteine transaminase that catalyzes the reversible transfer of the amino group from L-cysteine to the alpha-keto acid 2-oxoglutarate to respectively form 2-oxo-3-sulfanylpropanoate and L-glutamate (PubMed:36194135). The catalytic cycle occurs in the presence of pyridoxal 5'-phosphate (PLP) cofactor that facilitates transamination by initially forming an internal aldimine with the epsilon-amino group of active site Lys-55 residue on the enzyme (PLP-enzyme aldimine), subsequently displaced by formation of an external aldimine with the substrate amino group (PLP-L-cysteine aldimine). The external aldimine is further deprotonated to form a carbanion intermediate, which in the presence of 2-oxoglutarate regenerates PLP yielding final products 2-oxo-3-sulfanylpropanoate and L-glutamate. The proton transfer in carbanion intermediate is suggested to be controlled by the active site lysine residue, whereas PLP stabilizes carbanion structure through electron delocalization, also known as the electron sink effect (PubMed:36194135). Plays a key role in regulating maximal capacity for electron transport and oxidative phosphorylation (By similarity). May be involved in iron-sulfur cluster shuttling and/or in redox reactions. Can transfer the [2Fe-2S] cluster to an apo-acceptor protein only when in the oxidation state, likely serving as a redox sensor that regulates mitochondrial iron-sulfur cluster assembly and iron trafficking upon oxidative stress (PubMed:17584744, PubMed:21788481, PubMed:23758282)","subcellular_location":"Mitochondrion outer membrane","url":"https://www.uniprot.org/uniprotkb/Q9NZ45/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CISD1","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1090,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"RAB11A","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/CISD1","total_profiled":1310},"omim":[{"mim_id":"616127","title":"SPINOCEREBELLAR ATAXIA, AUTOSOMAL RECESSIVE 17; SCAR17","url":"https://www.omim.org/entry/616127"},{"mim_id":"616120","title":"CWF19-LIKE CELL CYCLE CONTROL FACTOR 1; CWF19L1","url":"https://www.omim.org/entry/616120"},{"mim_id":"613888","title":"RAS HOMOLOG GENE FAMILY, MEMBER T1; RHOT1","url":"https://www.omim.org/entry/613888"},{"mim_id":"611933","title":"CDGSH IRON SULFUR DOMAIN PROTEIN 3; CISD3","url":"https://www.omim.org/entry/611933"},{"mim_id":"611932","title":"CDGSH IRON SULFUR DOMAIN PROTEIN 1; CISD1","url":"https://www.omim.org/entry/611932"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Mitochondria","reliability":"Supported"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"parathyroid gland","ntpm":77.4}],"url":"https://www.proteinatlas.org/search/CISD1"},"hgnc":{"alias_symbol":["MDS029","mitoNEET"],"prev_symbol":["C10orf70","ZCD1"]},"alphafold":{"accession":"Q9NZ45","domains":[{"cath_id":"3.40.5.90","chopping":"41-108","consensus_level":"medium","plddt":94.7469,"start":41,"end":108},{"cath_id":"1.20.5","chopping":"1-40","consensus_level":"medium","plddt":85.434,"start":1,"end":40}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9NZ45","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9NZ45-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9NZ45-F1-predicted_aligned_error_v6.png","plddt_mean":91.19},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CISD1","jax_strain_url":"https://www.jax.org/strain/search?query=CISD1"},"sequence":{"accession":"Q9NZ45","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9NZ45.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9NZ45/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9NZ45"}},"corpus_meta":[{"pmid":"27510639","id":"PMC_27510639","title":"CISD1 inhibits ferroptosis by protection against mitochondrial lipid peroxidation.","date":"2016","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/27510639","citation_count":400,"is_preprint":false},{"pmid":"22961109","id":"PMC_22961109","title":"MitoNEET-driven alterations in adipocyte mitochondrial activity reveal a crucial adaptive process that preserves insulin sensitivity in obesity.","date":"2012","source":"Nature medicine","url":"https://pubmed.ncbi.nlm.nih.gov/22961109","citation_count":398,"is_preprint":false},{"pmid":"14570702","id":"PMC_14570702","title":"Identification of a novel mitochondrial protein (\"mitoNEET\") cross-linked specifically by a thiazolidinedione photoprobe.","date":"2003","source":"American journal of physiology. 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Endocrinology and metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct biochemical identification by photoaffinity cross-linking, MS, and N-terminal sequencing in a foundational study; replicated by multiple subsequent labs\",\n      \"pmids\": [\"14570702\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"mitoNEET is an integral outer mitochondrial membrane protein with an N-terminal transmembrane anchor and a cytoplasm-facing CDGSH domain containing 1.6 mol Fe per mole protein; cardiac mitochondria from mitoNEET-null mice show reduced oxidative capacity, establishing its role in controlling maximal mitochondrial respiratory rates.\",\n      \"method\": \"Bioinformatic analysis, iron quantification, subcellular fractionation/localization, mitoNEET-null mouse model with mitochondrial respiration assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct localization, iron measurement, and KO mouse with defined respiratory phenotype; foundational paper replicated across labs\",\n      \"pmids\": [\"17376863\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"X-ray crystal structure (1.5 Å) of mitoNEET revealed a unique dimeric 'NEET fold' in which each protomer coordinates a 2Fe-2S cluster; pioglitazone binding stabilizes the protein against 2Fe-2S cluster release.\",\n      \"method\": \"X-ray crystallography at 1.5 Å, ligand-stability assays with pioglitazone\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — atomic-resolution crystal structure with functional validation of drug stabilization; independently confirmed by three crystal structures published the same year\",\n      \"pmids\": [\"17766440\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"The 2Fe-2S cluster of mitoNEET is redox-active and pH-labile; mass spectrometry confirmed loss of 2Fe and 2S upon cofactor extrusion; spectroscopy showed the cluster is coordinated by Cys-3 and His-1 residues, with protonation of the His ligand triggering cluster release, suggesting a role in Fe-S cluster shuttling and/or redox reactions.\",\n      \"method\": \"Optical spectroscopy, electron paramagnetic resonance (EPR), mass spectrometry, recombinant mutagenesis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multiple orthogonal biophysical methods (EPR, optical, MS) with mutagenesis in a single study; replicated across many subsequent papers\",\n      \"pmids\": [\"17584744\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Crystal structure of human mitoNEET soluble domain (residues 32–108) at 1.8 Å revealed an intertwined homodimer with a [2Fe-2S] cluster coordinated by three cysteines and one histidine (novel CCCH-type motif), and UV-visible spectra indicated redox (oxidized/reduced) states.\",\n      \"method\": \"X-ray crystallography at 1.8 Å, UV-visible absorption spectroscopy\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — independent crystal structure confirming CCCH coordination motif; consistent with two other structures published simultaneously\",\n      \"pmids\": [\"17766439\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Crystal structure of the cytoplasmic mitoNEET domain at high resolution confirmed [2Fe-2S] cluster coordination by Cys-72, Cys-74, Cys-83, and His-87; homodimerization is mediated by hydrophobic interactions and hydrogen bonds; His-87 is solvent-exposed and proposed to mediate interaction with other proteins.\",\n      \"method\": \"X-ray crystallography, analytical ultracentrifugation (homodimer in solution and crystal)\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — high-resolution crystal structure, third independent confirmation of cluster coordination\",\n      \"pmids\": [\"17905743\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"CISD1 (mitoNEET) mRNA is down-regulated in cystic fibrosis cells and restored upon ectopic CFTR expression; a CISD1-GFP chimera localizes to mitochondria, demonstrating CFTR-dependent regulation of this mitochondrial protein.\",\n      \"method\": \"RT-PCR in cell lines with/without CFTR, CFTR inhibitors (glibenclamide, CFTR(inh)-172), cAMP stimulation, live-cell fluorescence imaging of CISD1-GFP\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct GFP localization and pharmacological manipulation in multiple cell lines, single lab\",\n      \"pmids\": [\"18047834\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Thiazolidinedione drug binding shifts the midpoint potential of the mitoNEET [2Fe-2S] cluster by more than 100 mV (from ~0 to −100 mV at pH 7); His87Cys mutation abolishes TZD's ability to affect the redox potential, indicating His87 mediates communication between the drug binding site and the Fe-S center.\",\n      \"method\": \"Protein film voltammetry (PFV), site-directed mutagenesis (H87C)\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct electrochemical measurement of redox potential with mutagenesis; single lab but two orthogonal approaches (PFV + mutagenesis)\",\n      \"pmids\": [\"19791753\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Resonance Raman spectra of mitoNEET show pH-dependent changes in the Fe-His87 region (250–300 cm⁻¹) absent in the H87C mutant, demonstrating that the Fe-N(His87) interaction is modulated within physiological pH range and that this modulation is coupled to cluster lability.\",\n      \"method\": \"Resonance Raman spectroscopy, comparison with H87C mutant\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct spectroscopic characterization with mutagenesis control, single lab\",\n      \"pmids\": [\"19388667\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"NADPH binds to homodimeric mitoNEET (at residues K55 and H58) and destabilizes the [2Fe-2S] clusters, promoting their release at pH ≤ 7.0 by disrupting inter-subunit interactions with H87′ and R73′.\",\n      \"method\": \"NMR spectroscopy, isothermal titration calorimetry, UV-visible absorption, circular dichroism\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — multiple orthogonal biophysical methods (NMR, ITC, UV-vis, CD) identifying binding site and functional consequence, single lab\",\n      \"pmids\": [\"20932062\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"EPR analysis of reduced mitoNEET confirmed valence-localized [2Fe-2S] cluster with Fe²⁺ at the His-bound iron; inter-cluster dipolar coupling is detectable and the histidine N-delta coordinates to iron with A_iso = −6.25 MHz.\",\n      \"method\": \"Multifrequency/multitechnique EPR (CW, ESEEM, ENDOR, HYSCORE), ¹⁵N-labeling\",\n      \"journal\": \"Journal of the American Chemical Society\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — multiple orthogonal EPR techniques with isotope labeling on purified recombinant protein, single lab\",\n      \"pmids\": [\"20099820\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"mitoNEET transfers its [2Fe-2S] cluster to apo-ferredoxin in a unidirectional, second-order reaction; His87 is required for cluster transfer (H87C mutant inhibits transfer), while the Lys55Glu mutation does not; pioglitazone inhibits iron transfer from mitoNEET to mitochondria in HEK293 cells.\",\n      \"method\": \"UV-VIS spectroscopy, native-PAGE, mitochondrial iron detection assay in cells, site-directed mutagenesis (H87C, K55E)\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution of cluster transfer with mutagenesis and cellular validation; multiple orthogonal methods\",\n      \"pmids\": [\"21788481\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Crystal structure of H87C mitoNEET at 1.7 Å showed that replacing His87 with Cys stabilizes the cluster ~6-fold and decreases the redox potential ~300 mV; Cys87 displays two conformations; structural changes are localized to the cluster-binding region.\",\n      \"method\": \"X-ray crystallography at 1.7 Å, spectroscopic cluster stability assays\",\n      \"journal\": \"Acta crystallographica. Section D, Biological crystallography\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — high-resolution crystal structure of mutant with biophysical characterization\",\n      \"pmids\": [\"21636891\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"NADPH inhibits [2Fe-2S] cluster transfer from mitoNEET to an apo-acceptor protein (K_i = 200 µM); the conserved Asp-84 residue in the CDGSH domain is required for NADPH-dependent inhibition of cluster transfer.\",\n      \"method\": \"In vitro cluster transfer assay, site-directed mutagenesis (D84 variants), inhibition kinetics\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with defined mutagenesis establishing mechanistic requirement; single lab, multiple methods\",\n      \"pmids\": [\"22351774\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"mitoNEET overexpression in adipocytes inhibits mitochondrial iron transport into the matrix, reducing electron transport chain activity, lowering β-oxidation rates, mitochondrial membrane potential, and ROS production; mitoNEET knockdown enhances mitochondrial respiratory capacity through increased matrix iron.\",\n      \"method\": \"Transgenic mouse overexpression, shRNA knockdown, mitochondrial iron measurements, metabolic/respiration assays\",\n      \"journal\": \"Nature medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal gain- and loss-of-function in vivo with direct measurement of mitochondrial iron and respiration; replicated concept across multiple papers\",\n      \"pmids\": [\"22961109\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"mitoNEET forms a covalent disulfide bond with glutamate dehydrogenase 1 (GDH1) and acts as an activator of GDH1; specific cysteine residues participating in the disulfide bond were identified by proteomics.\",\n      \"method\": \"Protein pulldown, SDS-PAGE, mass spectrometry/proteomics identification of disulfide bond\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — co-IP/pulldown with MS identification of covalent bond, single lab, single study\",\n      \"pmids\": [\"24295216\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"shRNA suppression of mitoNEET in breast cancer cells causes reduced cell proliferation, decreased mitochondrial performance, uncontrolled accumulation of mitochondrial iron and ROS, and activation of autophagy.\",\n      \"method\": \"shRNA knockdown, cell proliferation assays, mitochondrial iron/ROS imaging, autophagy assays, xenograft tumor model\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KD with multiple orthogonal readouts (iron, ROS, autophagy, tumor growth) in vitro and in vivo\",\n      \"pmids\": [\"23959881\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"TNFα-induced necroptosis in hepatocytes requires mitoNEET: fructose/ethanol overexpression of CISD1 primes cells for TNFα cytotoxicity; TNFα promotes translocation of a Stat3-Grim-19 complex to mitochondria, which binds mitoNEET and triggers rapid release of its 2Fe-2S cluster, causing mitochondrial iron accumulation, ROS surge, and cell death.\",\n      \"method\": \"Co-immunoprecipitation (Stat3-Grim-19 with mitoNEET), Western blot, mitochondrial iron measurement, L929 cell and hepatocyte necroptosis models\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP demonstrating protein complex, functional cluster release assay, two cell model systems; single lab\",\n      \"pmids\": [\"24357718\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"mitoNEET Fe-S assembly strictly depends on mitochondrial ISC machinery (not CIA or CIAPIN1); augmenter of liver regeneration (ALR), a Mia40-dependent protein, is specifically required for mitoNEET maturation; holo-mitoNEET can repair oxidatively damaged Fe-S of IRP1/cytosolic aconitase, identifying IRP1 as a physiological acceptor of the mitoNEET Fe-S cluster.\",\n      \"method\": \"Genetic epistasis (siRNA depletion of ISC/CIA components), in vitro Fe-S assembly assay, cluster transfer to IRP1 after nitrosative stress, in vivo aconitase activity assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — pathway epistasis combined with in vitro reconstitution and cellular functional readout identifying both upstream biogenesis pathway and downstream acceptor protein\",\n      \"pmids\": [\"25012650\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"The [2Fe-2S] clusters of mitoNEET are reduced by glutathione/cysteine/DTT and can be reversibly oxidized by H₂O₂ without cluster disruption; human glutathione reductase efficiently reduces mitoNEET clusters via its redox-active disulfide, whereas rat thioredoxin reductase (selenocysteine-containing) has no such activity.\",\n      \"method\": \"In vitro biochemical reduction/oxidation assays, inhibitor (N-ethylmaleimide) studies, UV-visible spectroscopy\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct in vitro biochemical assays with multiple reductants and inhibitor controls, single lab\",\n      \"pmids\": [\"24403080\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Reduction of mitoNEET [2Fe-2S] clusters by human glutathione reductase proceeds via the enzyme's redox-active disulfide in an NADPH-dependent manner; N-ethylmaleimide abolishes this activity; rat thioredoxin reductase (selenocysteine) has negligible activity.\",\n      \"method\": \"In vitro enzyme assays, inhibitor studies, comparative enzyme analysis\",\n      \"journal\": \"Free radical biology & medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct in vitro enzymatic assay with mechanistic controls, single lab, confirms prior work\",\n      \"pmids\": [\"25645953\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"MAD-28 (a cluvenone derivative) binds mitoNEET and breaks the coordinative bond between His87 and the cluster Fe, destabilizing the 2Fe-2S cluster; cancer cells with suppressed mitoNEET are less susceptible to MAD-28, confirming NEET proteins as direct drug targets.\",\n      \"method\": \"Docking analysis, cell-based functional assays, shRNA suppression epistasis, mitochondrial respiration and iron measurements\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis (shRNA) confirming target engagement combined with docking and functional assays; single lab\",\n      \"pmids\": [\"25762074\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CISD1 (mitoNEET) negatively regulates ferroptosis in hepatocellular carcinoma cells by protecting against intramitochondrial lipid peroxidation; CISD1 expression is iron-dependently upregulated by erastin; genetic inhibition of CISD1 increases iron-mediated mitochondrial lipid peroxidation; pioglitazone-mediated stabilization of the Fe-S cluster inhibits mitochondrial iron uptake and lipid peroxidation.\",\n      \"method\": \"shRNA/siRNA knockdown, pioglitazone treatment, mitochondrial iron and lipid peroxidation measurements, erastin-induced ferroptosis model\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — loss-of-function and pharmacological gain-of-function with direct mechanistic readouts (iron, lipid peroxidation, ferroptosis); replicated by multiple subsequent papers\",\n      \"pmids\": [\"27510639\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Only the oxidized [2Fe-2S]²⁺ state of mitoNEET is active in cluster transfer to acceptor proteins; the reduced [2Fe-2S]⁺ state is a dormant form resistant to cluster loss; dioxygen is not required for transfer and does not affect transfer rate; mitoNEET thus uses an iron-based redox switch to regulate cluster transfer.\",\n      \"method\": \"Controlled spectroscopic reduction/oxidation, anaerobic cluster transfer assays, UV-vis and EPR spectroscopy\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — rigorous in vitro reconstitution with multiple orthogonal spectroscopic methods under tightly controlled conditions; single lab\",\n      \"pmids\": [\"26887944\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"β-cell-specific overexpression of mitoNEET causes hyperglycemia via activation of a Parkin-dependent mitophagic pathway with vacuole and mitophagosome formation; α-cell-specific mitoNEET induction leads to hypoglycemia and protective effects on β-cells.\",\n      \"method\": \"Cell-type-specific transgenic mouse models, histology, electron microscopy of mitophagosomes, glucose tolerance tests\",\n      \"journal\": \"Diabetes\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — cell-type-specific transgenic gain-of-function models linking mitoNEET to Parkin-dependent mitophagy pathway in vivo; single lab\",\n      \"pmids\": [\"26895793\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Flavin mononucleotide (FMN) but not FAD has a specific interaction with mitoNEET (EPR evidence); reduced flavin nucleotides rapidly reduce mitoNEET [2Fe-2S] clusters as electron shuttles, with one FMN molecule reducing ~100 mitoNEET clusters in 4 min.\",\n      \"method\": \"EPR spectroscopy, UV-vis absorption, flavin reductase/NADH assay system, molecular docking\",\n      \"journal\": \"Free radical biology & medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — EPR and in vitro enzymatic assays demonstrating specific FMN interaction and catalytic efficiency; single lab\",\n      \"pmids\": [\"27923678\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"mitoNEET is a redox enzyme that catalyzes electron transfer from FMNH₂ to oxygen or ubiquinone via its [2Fe-2S] clusters; ubiquinone-2 is a more efficient oxidant than O₂; pioglitazone inhibits this electron transfer activity by forming a unique complex with mitoNEET and FMNH₂.\",\n      \"method\": \"In vitro reconstituted electron transfer assay (FMN/NADH/flavin reductase system), UV-vis spectroscopy, anaerobic and aerobic conditions\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution of enzymatic activity with multiple electron acceptors and drug inhibition; single lab with multiple orthogonal conditions\",\n      \"pmids\": [\"28461337\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"mitoNEET KO cells show reduced frequency of intermitochondrial junctions and decreased total mitochondrial volume (reducing cellular respiration); mitoNEET overexpression strongly increases intermitochondrial contacts and causes mitochondrial clustering; a mitoNEET mutant resistant to oxidative stress increases H₂O₂ resistance of the mitochondrial network.\",\n      \"method\": \"3D-EM reconstruction, thin-section EM, respiration assays in KO cells, re-expression rescue experiments\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — KO, rescue, gain-of-function with direct EM quantification of intermitochondrial junctions and functional respiration assay\",\n      \"pmids\": [\"28716905\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"mitoNEET and NAF-1 (CISD2) directly interact in mammalian cells; mitoNEET can transfer its [2Fe-2S] clusters to NAF-1 in vitro; single and double shRNA knockdown establishes they function in the same cellular pathway controlling mitochondrial iron and ROS.\",\n      \"method\": \"Yeast two-hybrid, in vivo bimolecular fluorescence complementation (BiFC), direct coupling analysis, in vitro cluster transfer assay, shRNA knockdown with iron/ROS imaging\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — multiple orthogonal methods (Y2H, BiFC, in vitro cluster transfer) demonstrating direct protein interaction and functional epistasis; single lab\",\n      \"pmids\": [\"28426722\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"The cytosolic electron donor complex Ndor1/anamorsin (CIA machinery) reduces mitoNEET [2Fe-2S] clusters via transient protein-protein interaction, bringing their clusters into proximity; this provides a direct mechanistic link between CIA machinery and the mitoNEET cluster transfer/repair pathway.\",\n      \"method\": \"UV-vis and NMR spectroscopy in vitro, complex formation characterization\",\n      \"journal\": \"Journal of the American Chemical Society\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct in vitro spectroscopic evidence of transient complex and electron transfer; single lab, single study\",\n      \"pmids\": [\"28648056\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Loss of mitoNEET in striatum results in mitochondrial dysfunction (elevated ROS, reduced ATP production), loss of striatal dopamine and tyrosine hydroxylase, shortened gait, and reduced rotarod performance, consistent with a Parkinson's disease-like phenotype.\",\n      \"method\": \"CISD1 knockout mice, isolated mitochondria ROS and ATP assays, immunohistochemistry for TH/dopamine, gait analysis, rotarod\",\n      \"journal\": \"ACS chemical neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO mouse with multiple defined neurochemical and behavioral readouts; single lab\",\n      \"pmids\": [\"28880525\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"pH regulates mitoNEET cluster transfer activity around physiological cytosolic pH; mitoNEET is highly resistant to H₂O₂ compared to other Fe-S cluster transfer proteins (ISCU, SufB); only one of two mitoNEET clusters is transferred when the other is decomposed; direct cluster transfer to apo-ferredoxin (not via intermediary) is confirmed.\",\n      \"method\": \"In vitro cluster transfer assays at varying pH, H₂O₂ resistance assays vs. ISCU/SufB, biophysical approaches (native MS, spectroscopy)\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — multiple complementary biochemical and biophysical methods in a single study; single lab but rigorous controls\",\n      \"pmids\": [\"30204426\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Electron transfer kinetics of mitoNEET: FMNH₂ rapidly reduces [2Fe-2S] clusters; O₂ oxidizes reduced clusters at ~6 M⁻¹s⁻¹; ubiquinone-2 oxidizes them at ~3×10³ M⁻¹s⁻¹, ~500-fold faster than O₂, supporting ubiquinone as the intrinsic electron acceptor in mitochondria.\",\n      \"method\": \"Stopped-flow kinetics, UV-vis spectroscopy under anaerobic and aerobic conditions\",\n      \"journal\": \"Free radical biology & medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct kinetic measurement of electron transfer rates with multiple electron acceptors under defined conditions; single lab, extends prior enzymatic work\",\n      \"pmids\": [\"29704621\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Oxidized mitoNEET gates VDAC1 in a redox-dependent manner; mitoNEET binds VDAC1 at the DIDS-sensitive site in vitro; the VDAC inhibitor DIDS prevents both mitoNEET–VDAC1 binding in vitro and mitoNEET-dependent mitochondrial iron accumulation in situ, indicating mitoNEET closes VDAC1 to regulate metabolite flow.\",\n      \"method\": \"In vitro binding assay, DIDS inhibitor studies in cells and in vitro, mitochondrial iron accumulation assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct in vitro protein–protein interaction with VDAC1 plus cellular functional validation using specific inhibitor; multiple orthogonal approaches\",\n      \"pmids\": [\"31527235\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"AGBE (glycogen branching enzyme) binds specifically to holo-IRP1 (aconitase) and to mitoNEET; this interaction facilitates nuclear translocation of holo-IRP1, demonstrating mitoNEET as part of a complex regulating iron-dependent gene expression.\",\n      \"method\": \"Co-immunoprecipitation, genetic studies in Drosophila, nuclear fractionation\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP identifying complex and nuclear fractionation showing functional consequence; Drosophila model organism with ortholog relevance\",\n      \"pmids\": [\"31784520\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Crystal structure of mitoNEET soluble domain bound to sulfonamide ligand furosemide was determined; structural basis of drug binding site on mitoNEET was elucidated for rational drug design.\",\n      \"method\": \"X-ray crystallography of mitoNEET–furosemide complex\",\n      \"journal\": \"Communications chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure of protein–ligand complex; single study but atomic-resolution structural data\",\n      \"pmids\": [\"32382661\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"FMN (and lumiflavin) forms a specific covalent complex with mitoNEET under blue light exposure near the [2Fe-2S] cluster; lumichrome (FMN analog lacking ribityl and phosphate) cannot mediate cluster redox transition and acts as a competitive inhibitor, mapping the FMN binding site.\",\n      \"method\": \"EPR spectroscopy, UV-vis, blue-light cross-linking, FMN analog comparison\",\n      \"journal\": \"Free radical biology & medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — photochemical trapping and EPR fingerprinting of FMN binding site; single lab\",\n      \"pmids\": [\"32445867\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Pioglitazone-mediated neuroprotection after TBI requires mitoNEET: pioglitazone mitigates Ca²⁺-induced mitochondrial dysfunction and provides neuroprotection in WT mice but not in mitoNEET-null mice, establishing mitoNEET as the necessary mediator of pioglitazone's neuroprotective effects.\",\n      \"method\": \"WT and CISD1-null mouse TBI model, Ca²⁺-induced mitochondrial dysfunction assay, neuroprotection endpoints\",\n      \"journal\": \"Experimental neurology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic necessity demonstrated by KO mouse model under defined conditions; single lab, multiple functional readouts\",\n      \"pmids\": [\"32057797\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Single-molecule AFM force spectroscopy shows the Fe-N(His87) bond is the mechanically weakest point of the [2Fe-2S] cluster and its rupture can be independent of cluster break, enabling multiple unfolding pathways and a Fe₂S₂(Cys)₃ intermediate.\",\n      \"method\": \"AFM-based single-molecule force spectroscopy (AFM-SMFS)\",\n      \"journal\": \"Analytical chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — novel single-molecule technique revealing bond-level rupture pathway; single lab, single study, specialized method\",\n      \"pmids\": [\"33048522\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Cardiac-specific deletion of CISD1 results in mitochondrial morphological abnormalities and elevated ROS at early time points, progressing to cardiac dysfunction at 12 months and heart failure by 16 months, demonstrating mitoNEET is required for maintaining cardiac mitochondrial integrity during aging.\",\n      \"method\": \"Cardiac-specific CISD1 KO mouse on C57BL/6J background, echocardiography, electron microscopy, ROS measurements\",\n      \"journal\": \"Communications biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — tissue-specific KO with longitudinal functional and structural readouts; single lab\",\n      \"pmids\": [\"33514783\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Pioglitazone stabilizes the labile Fe(III)-N(His87) bond of the mitoNEET cluster ~10-fold (by AFM-SMFS), while reducing dissociation of other protein regions only ~3-fold; this Fe-N bond stabilization is the primary mechanism by which pioglitazone inhibits metal cluster transfer.\",\n      \"method\": \"AFM-based single-molecule force spectroscopy with a mitoNEET homodimer polyprotein construct\",\n      \"journal\": \"The journal of physical chemistry letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — novel single-molecule approach with quantitative bond-level resolution, single lab, single study\",\n      \"pmids\": [\"33856229\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"mitoNEET binds pyridoxal phosphate (PLP) specifically at Lys55 and catalyzes transamination of cysteine and 2-oxoglutarate to form 3-mercaptopyruvate and glutamate, demonstrating cysteine transaminase enzymatic activity.\",\n      \"method\": \"PLP binding assay (Lys55-specific), in vitro transamination assay with amino acid substrates\",\n      \"journal\": \"ACS chemical biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — direct in vitro enzymatic assay identifying novel activity, single lab, single study; requires independent replication\",\n      \"pmids\": [\"36194135\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Pharmacological inhibition of mitoNEET (NL-1 or rosiglitazone) induces PINK1-Parkin-mediated mitophagy; mitoNEET inhibition promotes Pink1/Parkin accumulation, mitochondria-lysosome crosstalk, and PGC-1α expression.\",\n      \"method\": \"NL-1 pharmacological inhibition, shRNA knockdown, Western blot of mitophagy markers (Pink1, Parkin, LC3), lysosome imaging in RAW264.7 cells\",\n      \"journal\": \"BMB reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological and genetic inhibition with defined pathway markers; single lab but orthogonal approaches\",\n      \"pmids\": [\"35725011\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"CISD1 accumulation in Pink1 and parkin mutant Drosophila forms aberrant disulfide-linked dimers incapable of coordinating the Fe-S cluster; elevated Cisd blocks mitophagy and impairs autophagy flux; genetic or pharmacological reduction of Cisd/CISD1 rescues locomotion, lifespan, dopamine levels, and mitochondrial ultrastructure in Pink1/parkin mutants, placing CISD1 downstream of PINK1 in the mitophagy pathway.\",\n      \"method\": \"Drosophila Pink1/parkin mutant genetics, human iPSC dopaminergic neurons, disulfide bond detection, mitophagy/autophagy flux assays, NL-1/rosiglitazone pharmacology, epistasis by genetic rescue\",\n      \"journal\": \"Molecular neurodegeneration\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis in multiple model systems (Drosophila, human neurons), multiple orthogonal assays, pharmacological validation; strong mechanistic placement of CISD1 downstream of PINK1\",\n      \"pmids\": [\"38273330\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"In Pink1 mutant flies and PINK1-mutant patient dopaminergic neurons, CISD1 forms aberrant disulfide-linked homodimers unable to bind the Fe-S cluster; overexpression of cluster-binding-deficient CISD1 worsens Pink1-mutant phenotypes, while complete loss of Cisd rescues all Pink1-mutant phenotypes, indicating that iron-depleted CISD1 is the pathogenic species operating downstream of PINK1.\",\n      \"method\": \"Drosophila genetics, human patient-derived dopaminergic neurons, disulfide dimer characterization, gain/loss-of-function with Fe-S binding mutant, behavioral and lifespan assays\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple model systems (fly, human neurons), structural characterization of pathogenic dimer, Fe-S mutant epistasis establishing mechanism; single lab with comprehensive readouts\",\n      \"pmids\": [\"39159312\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"mitoNEET inhibition (NL-1) ameliorates TBI-induced ferroptosis and cognitive dysfunction through activation of the mitoNEET/DHODH (dihydroorotate dehydrogenase) signaling axis; silencing DHODH blocks the anti-ferroptosis effects of NL-1, establishing DHODH as a downstream effector of mitoNEET in ferroptosis defense.\",\n      \"method\": \"mitoNEET KO and overexpression in TBI mouse models, DHODH siRNA epistasis, NL-1 pharmacology, ferroptosis markers, cognitive testing\",\n      \"journal\": \"Experimental neurology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis (DHODH siRNA reversing NL-1 effects) with gain/loss-of-function; single lab, single study\",\n      \"pmids\": [\"40189124\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CISD1/mitoNEET is an outer mitochondrial membrane homodimeric protein that coordinates two redox-active, pH-labile [2Fe-2S] clusters via an unusual 3-Cys/1-His (His87) motif; in its oxidized state it transfers Fe-S clusters to acceptor proteins including IRP1/cytosolic aconitase (repairing oxidative damage) and NAF-1/CISD2, a process requiring His87, inhibited by pioglitazone (which stabilizes the Fe-N bond), regulated by NADPH, and reset to the dormant reduced state by the Ndor1/anamorsin CIA complex; it catalyzes electron transfer from FMNH₂ to ubiquinone or O₂ and acts as a redox enzyme controlling mitochondrial energy metabolism; it gates VDAC1 in a redox-dependent manner to regulate metabolite and iron flux across the outer mitochondrial membrane; its accumulation (particularly as disulfide-linked, Fe-S-depleted dimers) blocks PINK1/Parkin-dependent mitophagy and drives neurodegeneration, placing CISD1 downstream of PINK1 in mitochondrial quality control; loss of CISD1 causes mitochondrial dysfunction, ferroptosis via iron-dependent mitochondrial lipid peroxidation, dopaminergic neurodegeneration, and cardiac failure with aging.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CISD1/mitoNEET is an integral outer mitochondrial membrane homodimer that coordinates redox-active, pH-labile [2Fe-2S] clusters and functions as a regulated Fe-S cluster donor and redox enzyme controlling mitochondrial iron handling and energy metabolism [#1, #2, #14]. Each protomer binds its cluster through a unique 3-Cys/1-His motif (Cys72/Cys74/Cys83/His87), and the solvent-exposed His87 is the linchpin of cluster lability: its protonation triggers cluster release, it electrochemically couples the drug-binding site to the iron center, and it is strictly required for cluster transfer to acceptor proteins [#3, #5, #7, #11]. Cluster maturation depends on the mitochondrial ISC machinery and augmenter of liver regeneration (ALR), and once oxidized—only the [2Fe-2S]2+ state is transfer-competent—mitoNEET delivers clusters to apo-ferredoxin, repairs oxidatively damaged IRP1/cytosolic aconitase, and transfers clusters to NAF-1/CISD2, while the reduced cluster represents a dormant state reset by the cytosolic Ndor1/anamorsin (CIA) electron-donor complex [#11, #18, #23, #28, #29]. Cluster transfer is gated by an iron-based redox switch and is tuned by NADPH binding (via Asp84) and by reduction through glutathione reductase, FMN, and flavin shuttles, and mitoNEET itself catalyzes electron transfer from FMNH2 to ubiquinone or O2 [#9, #13, #19, #25, #26]. Functionally, mitoNEET restricts mitochondrial matrix iron import—gating VDAC1 in a redox-dependent manner—thereby setting respiratory capacity, ROS production, and intermitochondrial junction formation [#14, #27, #33]. Through this control of mitochondrial iron and lipid peroxidation, CISD1 negatively regulates ferroptosis, and pioglitazone—which stabilizes the Fe-N(His87) bond ~10-fold—suppresses iron uptake and lipid peroxidation [#22, #40]. In mitochondrial quality control, CISD1 acts downstream of PINK1: in Pink1/parkin-mutant flies and patient-derived dopaminergic neurons it accumulates as aberrant disulfide-linked, Fe-S-depleted dimers that block mitophagy, and genetic or pharmacological reduction of CISD1 rescues locomotion, lifespan, dopamine, and mitochondrial ultrastructure [#43, #44]. Consistent with these roles, loss of CISD1 causes a Parkinson's-like striatal phenotype and age-dependent cardiac failure [#30, #39].\",\n  \"teleology\": [\n    {\n      \"year\": 2003,\n      \"claim\": \"Establishing what mitoNEET is required first identifying it as a discrete mitochondrial protein and a direct drug target, which framed all subsequent mechanistic work.\",\n      \"evidence\": \"Photoaffinity cross-linking with tritiated pioglitazone, MS, and N-terminal sequencing of mitochondrial fractions\",\n      \"pmids\": [\"14570702\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define molecular function or cofactor\", \"Association with beta-oxidation machinery not mechanistically resolved\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Localization, iron content, and a knockout respiratory phenotype defined mitoNEET as an iron-bearing outer-membrane protein controlling mitochondrial respiratory capacity.\",\n      \"evidence\": \"Bioinformatics, iron quantification, fractionation, and mitoNEET-null mouse respiration assays\",\n      \"pmids\": [\"17376863\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of respiratory control unresolved\", \"Cofactor chemistry not yet defined\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Atomic-resolution structures defined the novel NEET fold and the unusual 3-Cys/1-His [2Fe-2S] coordination, and showed pioglitazone stabilizes the cluster — establishing the structural logic of cluster lability and drug action.\",\n      \"evidence\": \"Three independent crystal structures (1.5–1.8 Å) with ligand-stability and UV-vis assays\",\n      \"pmids\": [\"17766440\", \"17766439\", \"17905743\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not establish in vivo acceptor proteins\", \"Functional consequence of cluster release not shown\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Spectroscopy established that the cluster is redox-active and pH-labile with His protonation triggering release, the first mechanistic hypothesis for cluster shuttling/redox function.\",\n      \"evidence\": \"EPR, optical spectroscopy, MS, and recombinant mutagenesis\",\n      \"pmids\": [\"17584744\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological acceptor unidentified\", \"Whether release reflects transfer or degradation unresolved\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"His87 was shown to electrochemically couple the drug-binding site to the Fe-S center, explaining how thiazolidinediones modulate cluster redox state.\",\n      \"evidence\": \"Protein film voltammetry and resonance Raman with H87C mutant\",\n      \"pmids\": [\"19791753\", \"19388667\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not establish physiological signal that tunes His87\", \"Downstream consequence of potential shift unaddressed\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"NADPH binding (K55/H58) and valence-localized cluster characterization linked cellular redox metabolites to cluster stability, indicating regulated release.\",\n      \"evidence\": \"NMR, ITC, UV-vis, CD, and multifrequency EPR with 15N-labeling\",\n      \"pmids\": [\"20932062\", \"20099820\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo relevance of NADPH-driven destabilization not tested\", \"Acceptor of released cluster still unknown\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"In vitro reconstitution demonstrated unidirectional cluster transfer to apo-ferredoxin requiring His87, defining mitoNEET as a cluster donor and explaining pioglitazone's block of iron transfer.\",\n      \"evidence\": \"UV-vis, native-PAGE cluster transfer assays, H87C/K55E mutagenesis, cellular mitochondrial iron assays\",\n      \"pmids\": [\"21788481\", \"21636891\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological acceptor in cells not yet identified\", \"Directionality control mechanism unresolved\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"NADPH inhibition of cluster transfer via Asp84, and reciprocal in vivo manipulation showing mitoNEET limits matrix iron import, connected cofactor chemistry to control of respiration and beta-oxidation.\",\n      \"evidence\": \"In vitro transfer assays with D84 mutants; transgenic overexpression and shRNA knockdown with mitochondrial iron and metabolic readouts\",\n      \"pmids\": [\"22351774\", \"22961109\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Transporter coupling iron import to mitoNEET not yet defined\", \"Whether iron control is via cluster transfer or membrane gating unresolved\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Genetic epistasis identified the ISC machinery and ALR as mitoNEET's maturation pathway and IRP1/cytosolic aconitase as a physiological cluster acceptor for oxidative repair, placing mitoNEET in iron-sulfur homeostasis.\",\n      \"evidence\": \"siRNA epistasis of ISC/CIA components, in vitro Fe-S assembly, cluster transfer to IRP1 after nitrosative stress\",\n      \"pmids\": [\"25012650\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How ALR specifically routes clusters to mitoNEET unresolved\", \"In vivo extent of IRP1 repair not quantified\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Identification of glutathione reductase as a physiological reductant and reversible H2O2 oxidation defined the redox systems that toggle mitoNEET between states.\",\n      \"evidence\": \"In vitro reduction/oxidation assays with multiple reductants, NEM inhibition, UV-vis\",\n      \"pmids\": [\"24403080\", \"25645953\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo dominant reductant not established\", \"Thioredoxin system explicitly inactive but alternatives untested\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Demonstration that only the oxidized cluster is transfer-competent established an iron-based redox switch governing donor activity, with the reduced state dormant.\",\n      \"evidence\": \"Controlled spectroscopic redox manipulation and anaerobic cluster transfer assays (UV-vis, EPR)\",\n      \"pmids\": [\"26887944\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cellular signal setting the switch unresolved\", \"Spatial coupling to acceptor proteins not defined\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"mitoNEET was shown to negatively regulate ferroptosis by limiting mitochondrial iron uptake and lipid peroxidation, linking its iron control to a cell-death program.\",\n      \"evidence\": \"shRNA/siRNA knockdown, pioglitazone treatment, erastin ferroptosis model with iron and lipid peroxidation readouts\",\n      \"pmids\": [\"27510639\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream lipid peroxidation effectors not defined in this study\", \"Whether ferroptosis protection requires cluster transfer unresolved\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Identification of FMN as a specific electron shuttle for cluster reduction set up the redox-enzyme model of mitoNEET.\",\n      \"evidence\": \"EPR, UV-vis, flavin reductase/NADH assay, docking\",\n      \"pmids\": [\"27923678\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab finding\", \"Physiological FMN source at the outer membrane not established\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"mitoNEET was defined as a redox enzyme catalyzing electron transfer from FMNH2 to ubiquinone or O2, with kinetics favoring ubiquinone, integrating it into mitochondrial energy metabolism.\",\n      \"evidence\": \"Reconstituted electron transfer assays and stopped-flow kinetics with multiple acceptors under anaerobic/aerobic conditions\",\n      \"pmids\": [\"28461337\", \"29704621\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo electron acceptor not directly confirmed\", \"Relationship between enzyme activity and cluster-donor activity unresolved\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Direct interaction and cluster transfer to NAF-1/CISD2, plus shared iron/ROS pathway, established a functional NEET-protein network, while Ndor1/anamorsin was identified as the reductant resetting the dormant state.\",\n      \"evidence\": \"Y2H, BiFC, in vitro cluster transfer, shRNA epistasis (CISD2); UV-vis/NMR transient-complex analysis (Ndor1/anamorsin)\",\n      \"pmids\": [\"28426722\", \"28648056\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Hierarchy between CISD1 and CISD2 cluster handling unresolved\", \"Ndor1/anamorsin interaction shown in vitro only\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Knockout/rescue and gain-of-function revealed mitoNEET shapes mitochondrial network architecture and intermitochondrial junctions, mechanistically linking it to respiration and oxidative resistance.\",\n      \"evidence\": \"3D-EM reconstruction, EM quantification, respiration assays in KO/rescue cells with an oxidation-resistant mutant\",\n      \"pmids\": [\"28716905\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of junction formation unresolved\", \"Whether junctions require cluster transfer untested\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Demonstration that oxidized mitoNEET binds and gates VDAC1 at the DIDS-sensitive site provided a direct mechanism for redox-dependent control of mitochondrial metabolite and iron flux.\",\n      \"evidence\": \"In vitro binding, DIDS inhibitor studies in vitro and in cells, mitochondrial iron accumulation assays\",\n      \"pmids\": [\"31527235\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structure of the mitoNEET–VDAC1 interface unknown\", \"Quantitative contribution to total metabolite flux unresolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Pharmacological and genetic inhibition linked mitoNEET to PINK1-Parkin mitophagy, suggesting its activity opposes mitophagic turnover.\",\n      \"evidence\": \"NL-1/rosiglitazone inhibition, shRNA, mitophagy marker Western blots, lysosome imaging\",\n      \"pmids\": [\"35725011\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direction of regulation (inhibition vs accumulation) needed clarification\", \"Single cell-type system\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Cross-organism genetics placed CISD1 downstream of PINK1, showing that Fe-S-depleted, disulfide-linked CISD1 dimers are the pathogenic species blocking mitophagy and that reducing CISD1 rescues Pink1/parkin-mutant phenotypes.\",\n      \"evidence\": \"Drosophila Pink1/parkin genetics, human iPSC and patient dopaminergic neurons, disulfide-dimer characterization, Fe-S-binding-mutant epistasis, NL-1/rosiglitazone pharmacology\",\n      \"pmids\": [\"38273330\", \"39159312\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which iron-depleted dimers block mitophagy unresolved\", \"Whether the pathogenic dimer forms in mammalian disease tissue in vivo not shown\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"A mitoNEET/DHODH axis was identified as a downstream effector of ferroptosis defense, extending mitoNEET's anti-ferroptotic role to a specific enzymatic partner.\",\n      \"evidence\": \"mitoNEET KO/overexpression in TBI mice, DHODH siRNA epistasis, NL-1 pharmacology, ferroptosis and cognitive readouts\",\n      \"pmids\": [\"40189124\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab, single-study finding\", \"Direct physical/biochemical link between mitoNEET and DHODH not established\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How CISD1's distinct biochemical activities — cluster donation, VDAC1 gating, FMNH2-to-ubiquinone electron transfer, and putative cysteine transaminase activity — are integrated and prioritized in vivo, and which underlies its mitophagy and neurodegeneration roles, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model linking enzymatic vs cluster-donor functions to phenotypes\", \"Cysteine transaminase activity (idx 41) awaits independent replication\", \"Mammalian in vivo relevance of the pathogenic disulfide dimer untested\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016491\", \"supporting_discovery_ids\": [26, 32, 25]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [11, 18, 28]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [33]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [27]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005741\", \"supporting_discovery_ids\": [1]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [0, 1, 6]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [14, 26]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [22, 17, 45]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [43, 42, 24]},\n      {\"term_id\": \"R-HSA-382551\", \"supporting_discovery_ids\": [33, 14]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"CISD2\", \"VDAC1\", \"ACO1\", \"FDX1\", \"GLUD1\", \"DHODH\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}