{"gene":"SLC25A4","run_date":"2026-06-10T07:46:32","timeline":{"discoveries":[{"year":2016,"finding":"Recombinant AAC1 (SLC25A4) mutant proteins R80H and R235G are severely impaired in ADP/ATP transport in vitro, affecting substrate binding and mechanics of the carrier respectively, and cause marked loss of mtDNA copy number and respiratory chain deficiencies in skeletal muscle.","method":"Recombinant protein expression, ADP/ATP transport assay, patient muscle analysis (western blot, respiratory chain enzyme activities)","journal":"American journal of human genetics","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro transport reconstitution with mutant proteins plus orthogonal patient muscle biochemistry in a single rigorous study","pmids":["27693233"],"is_preprint":false},{"year":2011,"finding":"adPEO-associated mutant human ANT1 expressed in differentiated mouse myotubes causes dominant mitochondrial defects: decreased ADP-ATP exchange function and abnormal translocator reversal potential, with exchange reversal occurring at higher than normal membrane potential; these changes differ from simple ANT1 loss of function.","method":"Expression of mutant ANT1 in mouse myotubes; ADP-ATP exchange assay; electrophysiology measuring reversal potential; Ant1 siRNA knockdown as control","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — in vitro functional transport assay in disease-relevant mammalian cells, with knockdown controls distinguishing gain-of-function from loss-of-function, single lab but multiple orthogonal methods","pmids":["21586654"],"is_preprint":false},{"year":2004,"finding":"Yeast AAC2 mutations equivalent to human adPEO ANT1 mutations reduce ADP versus ATP transport and show a defect in ADP/ATP exchange ratio; in heteroallelic strains, reduced cytochrome content and increased mtDNA instability behave as dominant traits, demonstrating that pathogenic ANT1 mutations impair oxidative phosphorylation and destabilize mtDNA.","method":"Yeast complementation (Saccharomyces cerevisiae), ATP/ADP transport assay, cytochrome spectroscopy, cytochrome c oxidase activity, respiratory growth assay, mtDNA stability assay in heteroallelic strains","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — in vitro transport assay, multiple functional readouts, yeast genetic model with both haploid and heteroallelic (dominant) conditions tested","pmids":["15016764"],"is_preprint":false},{"year":2021,"finding":"Purified recombinant ANT1 reconstituted in planar lipid bilayers mediates H+ transport only in the presence of long-chain fatty acids (not as a basal proton leak), dependent on fatty acid chain length and saturation; this transport is inhibited by purine nucleotides (preference ATP/ADP) and by the specific ANT1 inhibitors carboxyatractyloside and bongkrekic acid, consistent with a fatty acid cycling mechanism at the lipid-protein interface.","method":"Reconstitution of purified recombinant ANT1 in planar lipid bilayers; electrophysiology (membrane current measurement); fluorescence correlation spectroscopy for protein quantification; molecular dynamics simulation","journal":"International journal of molecular sciences","confidence":"High","confidence_rationale":"Tier 1 / Moderate — reconstitution in lipid bilayers with direct current measurement, inhibitor pharmacology, and MD simulations in a single study","pmids":["33801254"],"is_preprint":false},{"year":2023,"finding":"ANT1 transports fatty acid anions back across the inner mitochondrial membrane via a 'FA sliding' mechanism: FA anions are attracted by positively charged arginines/lysines on the matrix side, slide along the positively charged protein-lipid interface, and bind to R79 where they are protonated. R79 is also critical for competitive binding of ADP/ATP substrates and the inhibitors carboxyatractyloside and bongkrekic acid.","method":"Planar lipid bilayer electrophysiology; site-directed mutagenesis of ANT1; molecular dynamics simulations","journal":"International journal of molecular sciences","confidence":"High","confidence_rationale":"Tier 1 / Moderate — reconstitution with mutagenesis and MD simulation, orthogonal methods in one study, extends the FA cycling mechanism to a specific residue","pmids":["37762012"],"is_preprint":false},{"year":2017,"finding":"NLRP3 inflammasome stimulators trigger SHP2 translocation to mitochondria where it interacts with and dephosphorylates ANT1, preventing collapse of mitochondrial membrane potential and subsequent release of mitochondrial DNA and ROS, thereby limiting NLRP3 hyperactivation. Ablation or inhibition of SHP2 in macrophages intensifies NLRP3 activation.","method":"Co-immunoprecipitation of SHP2 and ANT1; mitochondrial fractionation; genetic ablation (SHP2 knockout macrophages); overexpression; cytokine measurement; peritonitis model","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP for SHP2-ANT1 interaction, genetic KO with defined cellular phenotype, and in vivo model; single lab but multiple orthogonal methods","pmids":["29255148"],"is_preprint":false},{"year":2023,"finding":"Mitochondrial GSNOR denitrosylates ANT1 at cysteine 160 (C160). Under heart failure conditions, decreased mitochondrial GSNOR leads to elevated S-nitrosylation of ANT1 at C160, impairing mitochondrial membrane potential and mitophagy. Overexpression of non-nitrosylatable ANT1 C160A mutant or mitochondrial GSNOR improved mitochondrial function.","method":"Biotin-switch assay; LC-MS/MS identification of S-nitrosylation site (C160); cellular fractionation; immunofluorescence; cardiac-specific GSNOR KO mouse; AAV9-mediated mitochondria-targeted GSNOR overexpression; mitochondrial function assays","journal":"Circulation research","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — MS-identified modification site validated by mutagenesis (C160A), genetic KO and OE rescue, multiple orthogonal methods in one study","pmids":["37377022"],"is_preprint":false},{"year":2015,"finding":"ANT1 mutations (equivalent to adPEO and cardiomyopathy/myopathy mutations) cause protein misfolding in the yeast inner membrane, which disrupts the assembly and stability of multiple protein complexes in the membrane; adPEO-type mutations additionally form large aggregates whereas cardiomyopathy/myopathy-type mutations do not, suggesting these diseases belong to protein misfolding disorders.","method":"Yeast Aac2 mutagenesis; native gel electrophoresis of membrane complexes; pulse-chase analysis; fluorescence microscopy of aggregate formation","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — yeast genetic model with multiple orthogonal biochemical methods; single lab but mechanistically detailed","pmids":["25833713"],"is_preprint":false},{"year":2016,"finding":"ANT1 confers sensitivity of the mitochondrial permeability transition (mPT) pore to the proton electrochemical gradient: cells lacking ANT1 are resistant to Ca2+- and H2O2-induced mitochondrial swelling despite greater membrane potential losses, and permeabilized ANT1-null myotubes show higher calcium uptake capacity and voltage-thresholds of mPT opening.","method":"mPT onset assessment by mitochondrial volume measurement ('thinness ratio', cobalt-calcein) in ANT1-deficient human fibroblasts and ANT1-knockdown C2C12 myotubes; Ca2+ measurement by X-rhod-1 and 4mtD3cpv biosensor; cytochrome c release assay","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal techniques on loss-of-function cell models with defined mechanistic readout; single lab","pmids":["27221760"],"is_preprint":false},{"year":2018,"finding":"De novo dominant ANT1 (SLC25A4) mutations (R80H, R235G) classified as gain-of-function in yeast: introduction into yeast AAC2 in heteroallelic strains (mimicking human heterozygosity) caused more severe OXPHOS phenotypes than the hemiallelic strain, demonstrating gain-of-function dominance rather than haploinsufficiency.","method":"Yeast mutagenesis of AAC2 at equivalent positions; phenotypic characterization of hemiallelic vs heteroallelic yeast strains; respiratory growth assay","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis in yeast with heteroallelic vs hemiallelic comparison; single lab, single method, but mechanistically informative","pmids":["28947214"],"is_preprint":false},{"year":2017,"finding":"NF-κB binds to two NF-κB responsive elements in the ANT1 promoter (+1 to +20 bp and +41 to +61 bp) and represses ANT1 transcription; TNFα-induced NF-κB activation suppresses ANT1 mRNA and protein, impairs ATP/ADP exchange, decreases ATP production, decreases calcium-induced mPTP opening, elevates mitochondrial potential, and increases ROS production.","method":"Promoter reporter assay; chromatin immunoprecipitation (ChIP); TNFα stimulation; RT-PCR and western blot; mitochondrial ATP/ADP exchange assay; mitochondrial membrane potential and ROS measurement","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP and promoter assays establish direct transcriptional regulation, functional consequences measured by multiple assays; single lab","pmids":["28877317"],"is_preprint":false},{"year":2004,"finding":"ANT1 overexpression induces apoptosis by recruiting the IκBα-NF-κB complex to mitochondria, coincident with decreased nuclear NF-κB DNA binding activity, downregulation of anti-apoptotic NF-κB target genes (Bcl-XL, MnSOD2, c-IAP2), and sensitization to apoptosis. ANT2 overexpression does not cause this effect, demonstrating isoform specificity.","method":"ANT1 overexpression; subcellular fractionation; western blot for IκBα/NF-κB in mitochondria; NF-κB EMSA (DNA binding); gene expression analysis; apoptosis assays; p65 co-expression rescue experiment","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (fractionation, EMSA, rescue by p65) in single lab; isoform specificity control strengthens mechanism","pmids":["15231833"],"is_preprint":false},{"year":2006,"finding":"ANT1 isoform, but not ANT2, is responsible for a significant fraction of the high basal proton leak (CAtr-sensitive) in brown-fat mitochondria; ANT2 mediates fatty acid-induced uncoupling in liver mitochondria. Brown adipose tissue expresses both Ant1 and Ant2 mRNA equally, whereas liver expresses only Ant2.","method":"Carboxyatractyloside (CAtr) inhibitor experiments on isolated brown-fat and liver mitochondria from wild-type and UCP1−/− mice; respiration measurement; isoform-specific mRNA expression by RT-PCR","journal":"The Biochemical journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological inhibition with CAtr distinguishing isoforms; indirect inference of ANT1 role from isoform expression pattern; single lab","pmids":["16831128"],"is_preprint":false},{"year":2016,"finding":"ANT1 activity mediates fatty acid-induced uncoupling in skeletal muscle mitochondria. siRNA-mediated ANT1 knockdown in C2C12 myotubes decreased sensitivity to palmitate-induced uncoupling and impaired insulin-stimulated glucose uptake; in ZDF rat mitochondria, reduced FA-induced uncoupling was abolished by the ANT inhibitor carboxyatractyloside.","method":"siRNA knockdown of ANT1 in C2C12 myotubes; mitochondrial respiration assay with oleate/palmitate titration; carboxyatractyloside inhibitor experiment on ZDF rat skeletal muscle mitochondria; insulin-stimulated glucose uptake assay","journal":"Diabetologia","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA knockdown with functional readout, pharmacological inhibition; single lab, multiple complementary experiments","pmids":["26886198"],"is_preprint":false},{"year":2010,"finding":"PGC-1α-induced upregulation of ANT1 mediates increased susceptibility to ischemia-reperfusion injury in cardiomyocytes: siRNA knockdown of ANT1 abolished the detrimental effect of PGC-1α overexpression on cell death during anoxia-reoxygenation and preserved mitochondrial membrane potential under H2O2 stress.","method":"Adenoviral PGC-1α overexpression in H9c2 cells; Affymetrix gene array; siRNA knockdown of ANT1; anoxia-reoxygenation injury; mitochondrial membrane potential assay; Langendorff perfusion of PGC-1α transgenic mouse hearts","journal":"Journal of molecular and cellular cardiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gene array identification + siRNA rescue places ANT1 in pathway; single lab, multiple methods","pmids":["20600099"],"is_preprint":false},{"year":2010,"finding":"MeCP2 interacts with YY1 and together they repress ANT1 gene transcription; loss of MeCP2 leads to increased ANT1 mRNA and protein levels in human and mouse cell lines, Rett patient fibroblasts, and Mecp2-null mouse brain.","method":"Co-immunoprecipitation (MeCP2-YY1 interaction in vitro and in vivo); ANT1 promoter-reporter assay; RT-PCR and western blot in MeCP2-null cells and Mecp2-null mouse brain","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — Co-IP for protein interaction and promoter assay for transcriptional repression; multiple cell/tissue models; single lab","pmids":["20504995"],"is_preprint":false},{"year":2009,"finding":"In Podospora anserina, adPEO-equivalent ANT1 mutations (A114P, L98P, V289M) dominantly cause decreased mitochondrial inner membrane potential, decreased ROS production, and accumulation of large-scale mtDNA deletions. Suppression of mtDNA instability from M106P and A121P mutations was achieved without restoration of membrane potential, indicating mtDNA instability is not solely caused by reduced membrane potential or altered ROS.","method":"Fungal genetics (Podospora anserina); dominant mutation introduction; membrane potential measurement; ROS assay; mtDNA deletion analysis; suppressor genetics (rmp1 and AS1 alleles)","journal":"Genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis with suppressor alleles in fungal model; multiple functional readouts; single lab","pmids":["19687137"],"is_preprint":false},{"year":2022,"finding":"Oxidative stress-induced changes in lipid shape (PE adducts, lysolipids) decrease the stored curvature elastic stress (SCES) of the lipid bilayer membrane, which increases the protonophoric activity of ANT1 (and UCP1); ANT1 senses membrane curvature elastic stress to regulate H+ transport.","method":"Planar lipid bilayer electrophysiology with ANT1; lipid composition manipulation (OPC, MPC, PE adducts); molecular dynamics simulations of lateral pressure profiles","journal":"Antioxidants (Basel, Switzerland)","confidence":"Medium","confidence_rationale":"Tier 1-2 / Weak — reconstitution in lipid bilayers with defined lipid compositions and MD simulation; single lab, novel mechanistic claim","pmids":["36552523"],"is_preprint":false},{"year":2018,"finding":"Brain-specific Ant1 heterozygous conditional knockout mice show hyperexcitability of dorsal raphe serotonergic neurons, enhanced serotonin turnover in the nucleus accumbens, upregulation of Maob in dorsal raphe, and accumulation of COX-negative cells in dorsal raphe, linking ANT1 mitochondrial dysfunction to serotonergic dysregulation.","method":"Conditional brain-specific Ant1 heterozygous knockout mice; behavioral analysis (IntelliCage, 5-CSRTT); electrophysiology of dorsal raphe neurons; serotonin turnover measurement; immunohistochemistry for COX-negative cells; Maob expression analysis","journal":"Molecular psychiatry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO with multiple orthogonal cellular and behavioral readouts; single lab","pmids":["29892051"],"is_preprint":false},{"year":2011,"finding":"Complete loss of ANT1 expression (homozygous splice-site mutation) in a patient causes a clinical syndrome of cardiomyopathy and myopathy, with dramatic mitochondrial proliferation, multiple mtDNA deletions, and abnormal metabolic profile; no compensatory increase in ANT3 transcript was observed.","method":"Patient molecular diagnosis; RT-PCR showing absent ANT1 transcript; metabolic profiling; muscle biopsy histology; ANT3 expression measurement","journal":"Journal of medical genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — natural human loss-of-function model with multiple biochemical/pathological readouts; single case but definitive null allele","pmids":["22187496"],"is_preprint":false},{"year":2018,"finding":"A de novo dominant SLC25A4 variant (p.Lys33Gln) expressed in Lactococcus lactis membrane vesicles shows significantly impaired ADP/ATP transport, establishing loss of transport function as the pathogenic mechanism; patient muscle shows decreased complex I, III, and IV protein levels with largely unaffected total AAC content.","method":"Expression of mutant AAC1 in Lactococcus lactis; transport assay with fused membrane vesicles; immunohistochemistry and western blot of patient muscle","journal":"Neurology. Genetics","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — in vitro transport reconstitution in L. lactis with patient tissue validation; single case/single lab","pmids":["30046662"],"is_preprint":false},{"year":2022,"finding":"ANT1 acts upstream of the PINK1/Parkin mitophagy pathway: BaP/BPDE exposure suppresses ANT1 expression, leading to decreased PINK1 bound to the outer mitochondrial membrane and reduced Parkin recruitment, thereby impairing mitophagy in ovarian corpus luteum cells. Overexpression of ANT1 partially restores mitophagy and mitochondrial function.","method":"In vivo mouse exposure and in vitro KGN cell treatment with BaP/BPDE; ANT1 overexpression; PINK1/Parkin immunofluorescence and western blot; mitochondrial membrane potential and ATP measurement","journal":"The Science of the total environment","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — overexpression rescue and pathway component localization; single lab, multiple readouts","pmids":["34986425"],"is_preprint":false},{"year":2025,"finding":"USP34 deubiquitinates and stabilizes ANT1 protein, thereby promoting PINK1/Parkin-dependent mitophagy in chondrocytes; chondrocyte-specific Usp34 knockout mice develop age-dependent temporomandibular joint osteoarthritis, and USP34 deficiency exacerbates mechanical stress-induced degeneration.","method":"Chondrocyte-specific Usp34 knockout mice; co-immunoprecipitation (USP34-ANT1); ubiquitination assay; mitophagy assay; histological analysis of TMJ cartilage","journal":"JBMR plus","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — Co-IP and ubiquitination assay establish direct post-translational modification; KO mouse with defined cellular phenotype; single lab","pmids":["41631201"],"is_preprint":false},{"year":2014,"finding":"Drosophila sesB (ANT ortholog) mutant adults show decreased respiratory control ratio, downregulation of cytochrome oxidase, ATP depletion, lactate accumulation, and a metabolic shift toward glycolysis. Female sterility is substantially rescued by somatic expression of alternative oxidase (AOX), while developmental delay was alleviated by an altered mitochondrial DNA background.","method":"Bioenergetic analysis of sesB1 mitochondria (respiratory control ratio, COX activity); metabolomics (ATP, lactate); gene expression analysis; AOX transgenic rescue; mtDNA background substitution","journal":"Disease models & mechanisms","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple bioenergetic and metabolic readouts in Drosophila ANT model; genetic rescue experiments; single lab","pmids":["24812436"],"is_preprint":false},{"year":1992,"finding":"The human muscle adenine nucleotide translocator gene (ANT1) is localized to chromosome 4q35 by fluorescence in situ hybridization.","method":"Fluorescence in situ hybridization (FISH)","journal":"Cytogenetics and cell genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Strong — direct chromosomal localization by FISH; foundational mapping result confirmed by multiple subsequent studies","pmids":["1582253"],"is_preprint":false},{"year":2025,"finding":"Restoration of just ~10% of Ant1 gene expression via AAV2/9 delivery in neonatal Ant1−/− and Ant1−/−+ND6P25L mouse hearts was sufficient to ameliorate cardiomyopathy, reversing dysregulated mitochondrial metabolic genes including PGC1α, cardiac contractile proteins, and extracellular matrix proteins.","method":"AAV2/9-mediated ANT1 cDNA delivery in Ant1 null mice; proteomics; single-nucleus RNA sequencing; cardiac functional analysis","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo gene therapy rescue with multi-omic mechanistic validation; single lab but comprehensive","pmids":["41398158"],"is_preprint":false},{"year":2018,"finding":"ANT1 knockdown in macrophages reduces IL-6 expression after LPS stimulation; JNK signaling upstream of IL-6 is downregulated by ANT1 loss, while NF-κB signaling and other MAP kinases remain unchanged, placing ANT1 specifically in the JNK-IL-6 axis.","method":"ANT1 siRNA knockdown in macrophages; LPS stimulation; cytokine measurement; western blot for JNK, NF-κB, and MAP kinases","journal":"FEBS letters","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single siRNA experiment identifying signaling pathway; single lab, single method, no rescue","pmids":["30311946"],"is_preprint":false},{"year":2025,"finding":"Misfolding of mutant ANT1 (AAC2 in yeast) clogs TOM and TIM22 protein import complexes, inducing mitochondrial Precursor Overaccumulation Stress (mPOS) in the cytosol; MFB1 (mitochondrial F-box protein) overexpression suppresses growth defects from a clogger allele of AAC2, and its disruption exacerbates import clogging, suggesting MFB1 maintains import competency under ANT1 clogging conditions.","method":"Yeast genetics; BioID proximity labeling (Mfb1-Tom22 interaction); cell growth assay; cytosolic protein retention measurement","journal":"bioRxiv","confidence":"Low","confidence_rationale":"Tier 2-3 / Weak — preprint; BioID and genetic suppression data support mechanistic model but single lab, not peer-reviewed","pmids":["bio_10.1101_2025.10.13.682092"],"is_preprint":true}],"current_model":"SLC25A4 (ANT1) encodes the heart/muscle isoform of the mitochondrial ADP/ATP carrier that exchanges matrix ATP for cytosolic ADP across the inner mitochondrial membrane; it additionally mediates proton transport in the presence of long-chain fatty acids (fatty acid cycling mechanism) via a positively charged protein-lipid interface including R79; pathogenic missense mutations impair ADP/ATP transport and/or cause protein misfolding/aggregation that clogs the TOM/TIM22 import machinery, dominantly destabilizes mtDNA, and collapses mitochondrial membrane potential; ANT1 also confers voltage-sensitivity to the mitochondrial permeability transition pore, is regulated by S-nitrosylation at C160 (reversed by mitochondrial GSNOR) and ubiquitination (reversed by USP34), acts upstream of the PINK1/Parkin mitophagy pathway, and its transcription is repressed by the NF-κB and MeCP2/YY1 complexes."},"narrative":{"mechanistic_narrative":"SLC25A4 (ANT1) is the heart/muscle isoform of the mitochondrial ADP/ATP carrier that exchanges matrix ATP for cytosolic ADP across the inner membrane, a function established directly by reconstitution and transport assays in which pathogenic mutants are impaired [PMID:27693233, PMID:21586654, PMID:30046662]. Beyond nucleotide exchange, reconstitution of purified ANT1 in planar lipid bilayers shows it mediates H+ transport only in the presence of long-chain fatty acids, consistent with a fatty acid cycling mechanism in which FA anions slide along the positively charged protein-lipid interface and are protonated at R79, a residue that also governs ADP/ATP and inhibitor (carboxyatractyloside, bongkrekic acid) binding [PMID:33801254, PMID:37762012]; this protonophoric activity is sensitive to membrane curvature elastic stress set by bilayer lipid composition [PMID:36552523], and ANT1 mediates fatty-acid-induced uncoupling in skeletal muscle and brown-fat mitochondria [PMID:16831128, PMID:26886198]. ANT1 also confers voltage-sensitivity to the mitochondrial permeability transition pore, since cells lacking ANT1 resist Ca2+- and H2O2-induced swelling and show altered mPT voltage thresholds [PMID:27221760]. Pathogenic missense mutations act dominantly: equivalent substitutions in yeast and Podospora impair ADP/ATP exchange, destabilize mtDNA as a dominant (gain-of-function) trait, and—for adPEO-type alleles—misfold and aggregate in the inner membrane, disrupting assembly of multiple membrane complexes [PMID:15016764, PMID:25833713, PMID:28947214, PMID:19687137], while complete loss of ANT1 in a patient causes cardiomyopathy/myopathy with mitochondrial proliferation and multiple mtDNA deletions [PMID:22187496]. ANT1 is embedded in regulatory networks controlling its abundance and activity: its transcription is repressed by NF-κB and by the MeCP2/YY1 complex [PMID:28877317, PMID:20504995], it is dephosphorylated by mitochondrial SHP2 to limit NLRP3 inflammasome hyperactivation [PMID:29255148], denitrosylated at C160 by mitochondrial GSNOR to preserve membrane potential and mitophagy [PMID:37377022], and stabilized by USP34-mediated deubiquitination to support PINK1/Parkin mitophagy [PMID:41631201]; ANT1 itself acts upstream of PINK1/Parkin recruitment [PMID:34986425]. Restoring ~10% of Ant1 expression rescues murine cardiomyopathy, confirming dosage-sensitive control of cardiac mitochondrial gene programs [PMID:41398158].","teleology":[{"year":1992,"claim":"Establishing the genomic locus of the muscle ADP/ATP translocator provided the foundation for linking ANT1 to human disease.","evidence":"Fluorescence in situ hybridization mapping ANT1 to chromosome 4q35","pmids":["1582253"],"confidence":"Medium","gaps":["Mapping alone establishes no function or mechanism","No allelic disease association at this stage"]},{"year":2004,"claim":"Modeling adPEO-equivalent mutations in yeast first showed that pathogenic ANT1 alleles impair ADP/ATP exchange and destabilize mtDNA dominantly, distinguishing the disease mechanism from simple loss of function.","evidence":"Yeast AAC2 complementation with transport assays, cytochrome spectroscopy, and heteroallelic mtDNA stability tests","pmids":["15016764"],"confidence":"High","gaps":["Yeast model does not directly establish the human residue-level transport defect","Does not resolve whether dominance arises from aggregation or altered transport"]},{"year":2004,"claim":"ANT1 overexpression was shown to trigger apoptosis by recruiting the IκBα–NF-κB complex to mitochondria in an isoform-specific manner, linking the carrier to cell-death signaling.","evidence":"Overexpression with subcellular fractionation, NF-κB EMSA, and p65 rescue; ANT2 negative control","pmids":["15231833"],"confidence":"Medium","gaps":["Overexpression may not reflect endogenous behavior","Direct ANT1–IκBα binding not demonstrated"]},{"year":2006,"claim":"Pharmacological dissection of brown-fat versus liver mitochondria identified ANT1 as a contributor to basal proton leak, extending its role beyond nucleotide exchange.","evidence":"Carboxyatractyloside inhibition of respiration in isolated mitochondria with isoform-specific expression analysis","pmids":["16831128"],"confidence":"Medium","gaps":["ANT1 role inferred indirectly from isoform expression pattern","Molecular basis of proton conductance not resolved here"]},{"year":2009,"claim":"Suppressor genetics in Podospora showed that mtDNA instability from ANT1 mutations is not solely caused by reduced membrane potential or ROS, separating these phenotypes.","evidence":"Fungal dominant mutation analysis with membrane potential, ROS, mtDNA deletion, and suppressor allele tests","pmids":["19687137"],"confidence":"Medium","gaps":["Causal pathway from carrier dysfunction to mtDNA deletion remains undefined","Fungal model may not capture mammalian specifics"]},{"year":2010,"claim":"Two studies placed ANT1 abundance under physiological control—repression by MeCP2/YY1 and induction by PGC-1α—linking ANT1 dosage to neuronal (Rett) and cardiac ischemia phenotypes.","evidence":"MeCP2-YY1 Co-IP and promoter reporters in null cells/brain; PGC-1α overexpression with gene array and ANT1 siRNA rescue in cardiomyocytes","pmids":["20504995","20600099"],"confidence":"Medium","gaps":["Direct transcription-factor occupancy of the endogenous locus in vivo not fully resolved for all factors","How ANT1 dosage mechanistically drives ischemia-reperfusion injury not defined"]},{"year":2011,"claim":"Expression of adPEO mutant ANT1 in mammalian myotubes demonstrated a dominant gain-of-function with abnormal reversal potential, refining the disease mechanism in disease-relevant cells.","evidence":"Mutant ANT1 in mouse myotubes with ADP-ATP exchange assay, electrophysiology, and siRNA controls","pmids":["21586654"],"confidence":"High","gaps":["Does not address mtDNA instability mechanism","Aggregation contribution not assessed in this system"]},{"year":2011,"claim":"A human homozygous null established that complete ANT1 loss causes cardiomyopathy/myopathy with mtDNA deletions and no ANT3 compensation, defining the loss-of-function phenotype.","evidence":"Patient molecular diagnosis, RT-PCR, metabolic profiling, and muscle histology","pmids":["22187496"],"confidence":"Medium","gaps":["Single case","Mechanism connecting null allele to mtDNA deletions not resolved"]},{"year":2015,"claim":"Yeast biochemistry revealed that adPEO mutations cause inner-membrane misfolding and aggregation that disrupt multiple membrane complexes, reframing these diseases as protein-misfolding disorders.","evidence":"Yeast Aac2 mutagenesis with native gels, pulse-chase, and aggregate microscopy","pmids":["25833713"],"confidence":"Medium","gaps":["Aggregation demonstrated in yeast, not in human muscle","Relative contribution of misfolding versus transport defect to pathology unresolved"]},{"year":2016,"claim":"Direct transport reconstitution of patient mutants plus muscle biochemistry confirmed severe ADP/ATP transport impairment with mtDNA loss and respiratory deficiency.","evidence":"Recombinant R80H/R235G transport assays with orthogonal patient muscle analysis","pmids":["27693233"],"confidence":"High","gaps":["Does not distinguish transport defect from misfolding contribution in vivo","Mechanism of dominance addressed separately"]},{"year":2016,"claim":"Loss-of-function cell models established ANT1 as the determinant conferring proton-gradient voltage sensitivity to the permeability transition pore.","evidence":"mPT swelling, calcium uptake, and voltage-threshold assays in ANT1-deficient fibroblasts and knockdown myotubes","pmids":["27221760"],"confidence":"Medium","gaps":["Whether ANT1 is a structural pore component or a regulator not resolved","Single lab"]},{"year":2016,"claim":"ANT1 was shown to mediate fatty-acid-induced uncoupling in skeletal muscle with consequences for insulin-stimulated glucose uptake, tying its uncoupling activity to metabolism.","evidence":"siRNA knockdown in C2C12 myotubes and carboxyatractyloside inhibition in ZDF rat mitochondria with respiration and glucose-uptake assays","pmids":["26886198"],"confidence":"Medium","gaps":["Molecular mechanism of proton transport not addressed here","In vivo physiological relevance not established"]},{"year":2017,"claim":"ANT1 was identified as a post-translational target of mitochondrial SHP2 that limits NLRP3 inflammasome hyperactivation, and as a transcriptional target repressed by NF-κB.","evidence":"SHP2-ANT1 Co-IP, macrophage SHP2 KO, and peritonitis model; NF-κB ChIP and promoter reporter with mitochondrial functional assays","pmids":["29255148","28877317"],"confidence":"High","gaps":["SHP2 phosphosite on ANT1 not mapped","How dephosphorylation alters carrier activity unresolved"]},{"year":2018,"claim":"Yeast heteroallelic versus hemiallelic comparison demonstrated that de novo dominant ANT1 mutations are gain-of-function rather than haploinsufficient, and a separate L. lactis reconstitution defined loss of transport as the pathogenic mechanism for p.Lys33Gln.","evidence":"Yeast AAC2 genetic epistasis and L. lactis membrane-vesicle transport assay with patient muscle validation","pmids":["28947214","30046662"],"confidence":"Medium","gaps":["Different alleles may act through different mechanisms","Single-case reconstitution studies"]},{"year":2018,"claim":"A brain-specific Ant1 conditional knockout linked ANT1 mitochondrial dysfunction to serotonergic neuronal dysregulation, expanding the phenotypic reach of ANT1 deficiency.","evidence":"Conditional heterozygous Ant1 KO mice with electrophysiology, serotonin turnover, and COX histochemistry","pmids":["29892051"],"confidence":"Medium","gaps":["Mechanistic link from carrier loss to neuronal hyperexcitability undefined","Single lab"]},{"year":2021,"claim":"Bilayer reconstitution of purified ANT1 directly demonstrated fatty-acid-dependent H+ transport inhibited by nucleotides and ANT-specific inhibitors, establishing a fatty acid cycling mechanism.","evidence":"Planar lipid bilayer electrophysiology, FCS quantification, and molecular dynamics","pmids":["33801254"],"confidence":"High","gaps":["Physiological role of this proton transport in vivo not established here","Stoichiometry of FA cycling not defined"]},{"year":2022,"claim":"ANT1 was placed upstream of the PINK1/Parkin mitophagy pathway, and its protonophoric activity shown to respond to membrane curvature elastic stress, connecting lipid biophysics to ANT1 function.","evidence":"BaP/BPDE exposure with ANT1 overexpression and PINK1/Parkin localization; bilayer electrophysiology with defined lipid compositions and MD lateral-pressure simulations","pmids":["34986425","36552523"],"confidence":"Medium","gaps":["How ANT1 mechanistically promotes PINK1 OMM retention unresolved","Membrane-stress sensing not validated in intact mitochondria"]},{"year":2023,"claim":"Two studies defined residue-level mechanisms: R79 protonates sliding FA anions and governs nucleotide/inhibitor binding, while GSNOR-mediated denitrosylation at C160 preserves membrane potential and mitophagy in heart failure.","evidence":"Bilayer electrophysiology with site-directed mutagenesis and MD; biotin-switch/LC-MS/MS, C160A mutagenesis, cardiac GSNOR KO and AAV9 rescue","pmids":["37762012","37377022"],"confidence":"High","gaps":["Interplay between R79 transport role and FA protonation not fully separated","Upstream control of mitochondrial GSNOR not defined"]},{"year":2025,"claim":"Gene therapy and post-translational stabilization studies established ANT1 dosage control: ~10% Ant1 restoration rescues murine cardiomyopathy, and USP34 deubiquitination stabilizes ANT1 to drive PINK1/Parkin mitophagy.","evidence":"AAV2/9 Ant1 delivery with proteomics and snRNA-seq; chondrocyte Usp34 KO mice with USP34-ANT1 Co-IP and ubiquitination assays","pmids":["41398158","41631201"],"confidence":"Medium","gaps":["USP34 ubiquitination site on ANT1 not mapped","Threshold relationship between ANT1 dose and tissue rescue not generalized beyond heart"]},{"year":null,"claim":"How mutant ANT1 misfolding clogs the mitochondrial import machinery and how this is buffered remains to be resolved at the mechanistic level.","evidence":"Preprint yeast BioID and genetic suppression implicating TOM/TIM22 clogging and MFB1","pmids":[],"confidence":"Low","gaps":["Preprint, not peer-reviewed","Import-clogging mechanism not demonstrated in mammalian cells","Relationship between import clogging and the established aggregation phenotype unresolved"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005215","term_label":"transporter activity","supporting_discovery_ids":[0,1,2,20]},{"term_id":"GO:0140104","term_label":"molecular carrier activity","supporting_discovery_ids":[0,3,20]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[8]},{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[3,4,17]}],"localization":[{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[0,3,5,7,8]}],"pathway":[{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[0,12,13]},{"term_id":"R-HSA-382551","term_label":"Transport of small molecules","supporting_discovery_ids":[0,1,3,20]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[21,22]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[8,11]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[5,26]}],"complexes":["mitochondrial permeability transition pore"],"partners":["SHP2","USP34","MECP2","YY1","NFKB1","IKBA","GSNOR"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P12235","full_name":"ADP/ATP translocase 1","aliases":["ADP,ATP carrier protein 1","ADP,ATP carrier protein, heart/skeletal muscle isoform T1","Adenine nucleotide translocator 1","ANT 1","Solute carrier family 25 member 4"],"length_aa":298,"mass_kda":33.1,"function":"ADP:ATP antiporter that mediates import of ADP into the mitochondrial matrix for ATP synthesis, and export of ATP out to fuel the cell (PubMed:21586654, PubMed:27693233, PubMed:23173940, PubMed:30046662). Cycles between the cytoplasmic-open state (c-state) and the matrix-open state (m-state): operates by the alternating access mechanism with a single substrate-binding site intermittently exposed to either the cytosolic (c-state) or matrix (m-state) side of the inner mitochondrial membrane (By similarity). Substrate exchange across the membrane occurs consecutively with one substrate being transported first, then dissociating from the substrate binding site before the second substrate binds for transport in the opposite direction (PubMed:37278158). In addition to its ADP:ATP antiporter activity, also involved in mitochondrial uncoupling and mitochondrial permeability transition pore (mPTP) activity (PubMed:31883789). Plays a role in mitochondrial uncoupling by acting as a proton transporter: proton transport uncouples the proton flows via the electron transport chain and ATP synthase to reduce the efficiency of ATP production and cause mitochondrial thermogenesis (By similarity). Proton transporter activity is inhibited by ADP:ATP antiporter activity, suggesting that SLC25A4/ANT1 acts as a master regulator of mitochondrial energy output by maintaining a delicate balance between ATP production (ADP:ATP antiporter activity) and thermogenesis (proton transporter activity) (By similarity). Proton transporter activity requires free fatty acids as cofactor, but does not transport it (By similarity). Also plays a key role in mPTP opening, a non-specific pore that enables free passage of the mitochondrial membranes to solutes of up to 1.5 kDa, and which contributes to cell death (PubMed:31883789). It is however unclear if SLC25A4/ANT1 constitutes a pore-forming component of mPTP or regulates it (By similarity). Acts as a regulator of mitophagy independently of ADP:ATP antiporter activity: promotes mitophagy via interaction with TIMM44, leading to inhibit the presequence translocase TIMM23, thereby promoting stabilization of PINK1 (By similarity)","subcellular_location":"Mitochondrion inner membrane; Membrane","url":"https://www.uniprot.org/uniprotkb/P12235/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/SLC25A4","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/SLC25A4","total_profiled":1310},"omim":[{"mim_id":"619822","title":"BCL2-LIKE 13; BCL2L13","url":"https://www.omim.org/entry/619822"},{"mim_id":"618566","title":"ADENINE NUCLEOTIDE TRANSLOCASE LYSINE METHYLTRANSFERASE; ANTKMT","url":"https://www.omim.org/entry/618566"},{"mim_id":"617184","title":"MITOCHONDRIAL DNA DEPLETION SYNDROME 12A (CARDIOMYOPATHIC TYPE), AUTOSOMAL DOMINANT; MTDPS12A","url":"https://www.omim.org/entry/617184"},{"mim_id":"615418","title":"MITOCHONDRIAL DNA DEPLETION SYNDROME 12B (CARDIOMYOPATHIC TYPE), AUTOSOMAL RECESSIVE; MTDPS12B","url":"https://www.omim.org/entry/615418"},{"mim_id":"614520","title":"ENCEPHALOMYOPATHY, MITOCHONDRIAL, DUE TO VOLTAGE-DEPENDENT ANION CHANNEL DEFICIENCY","url":"https://www.omim.org/entry/614520"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Mitochondria","reliability":"Supported"}],"tissue_specificity":"Group enriched","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"heart muscle","ntpm":240.1},{"tissue":"skeletal muscle","ntpm":191.3},{"tissue":"tongue","ntpm":323.8}],"url":"https://www.proteinatlas.org/search/SLC25A4"},"hgnc":{"alias_symbol":["T1","AAC1"],"prev_symbol":["PEO3","PEO2","ANT1"]},"alphafold":{"accession":"P12235","domains":[{"cath_id":"1.50.40.10","chopping":"1-298","consensus_level":"medium","plddt":92.3141,"start":1,"end":298}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P12235","model_url":"https://alphafold.ebi.ac.uk/files/AF-P12235-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P12235-F1-predicted_aligned_error_v6.png","plddt_mean":92.06},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=SLC25A4","jax_strain_url":"https://www.jax.org/strain/search?query=SLC25A4"},"sequence":{"accession":"P12235","fasta_url":"https://rest.uniprot.org/uniprotkb/P12235.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P12235/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P12235"}},"corpus_meta":[{"pmid":"29255148","id":"PMC_29255148","title":"Tyrosine 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expression, ADP/ATP transport assay, patient muscle analysis (western blot, respiratory chain enzyme activities)\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro transport reconstitution with mutant proteins plus orthogonal patient muscle biochemistry in a single rigorous study\",\n      \"pmids\": [\"27693233\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"adPEO-associated mutant human ANT1 expressed in differentiated mouse myotubes causes dominant mitochondrial defects: decreased ADP-ATP exchange function and abnormal translocator reversal potential, with exchange reversal occurring at higher than normal membrane potential; these changes differ from simple ANT1 loss of function.\",\n      \"method\": \"Expression of mutant ANT1 in mouse myotubes; ADP-ATP exchange assay; electrophysiology measuring reversal potential; Ant1 siRNA knockdown as control\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro functional transport assay in disease-relevant mammalian cells, with knockdown controls distinguishing gain-of-function from loss-of-function, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"21586654\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Yeast AAC2 mutations equivalent to human adPEO ANT1 mutations reduce ADP versus ATP transport and show a defect in ADP/ATP exchange ratio; in heteroallelic strains, reduced cytochrome content and increased mtDNA instability behave as dominant traits, demonstrating that pathogenic ANT1 mutations impair oxidative phosphorylation and destabilize mtDNA.\",\n      \"method\": \"Yeast complementation (Saccharomyces cerevisiae), ATP/ADP transport assay, cytochrome spectroscopy, cytochrome c oxidase activity, respiratory growth assay, mtDNA stability assay in heteroallelic strains\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — in vitro transport assay, multiple functional readouts, yeast genetic model with both haploid and heteroallelic (dominant) conditions tested\",\n      \"pmids\": [\"15016764\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Purified recombinant ANT1 reconstituted in planar lipid bilayers mediates H+ transport only in the presence of long-chain fatty acids (not as a basal proton leak), dependent on fatty acid chain length and saturation; this transport is inhibited by purine nucleotides (preference ATP/ADP) and by the specific ANT1 inhibitors carboxyatractyloside and bongkrekic acid, consistent with a fatty acid cycling mechanism at the lipid-protein interface.\",\n      \"method\": \"Reconstitution of purified recombinant ANT1 in planar lipid bilayers; electrophysiology (membrane current measurement); fluorescence correlation spectroscopy for protein quantification; molecular dynamics simulation\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — reconstitution in lipid bilayers with direct current measurement, inhibitor pharmacology, and MD simulations in a single study\",\n      \"pmids\": [\"33801254\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"ANT1 transports fatty acid anions back across the inner mitochondrial membrane via a 'FA sliding' mechanism: FA anions are attracted by positively charged arginines/lysines on the matrix side, slide along the positively charged protein-lipid interface, and bind to R79 where they are protonated. R79 is also critical for competitive binding of ADP/ATP substrates and the inhibitors carboxyatractyloside and bongkrekic acid.\",\n      \"method\": \"Planar lipid bilayer electrophysiology; site-directed mutagenesis of ANT1; molecular dynamics simulations\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — reconstitution with mutagenesis and MD simulation, orthogonal methods in one study, extends the FA cycling mechanism to a specific residue\",\n      \"pmids\": [\"37762012\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"NLRP3 inflammasome stimulators trigger SHP2 translocation to mitochondria where it interacts with and dephosphorylates ANT1, preventing collapse of mitochondrial membrane potential and subsequent release of mitochondrial DNA and ROS, thereby limiting NLRP3 hyperactivation. Ablation or inhibition of SHP2 in macrophages intensifies NLRP3 activation.\",\n      \"method\": \"Co-immunoprecipitation of SHP2 and ANT1; mitochondrial fractionation; genetic ablation (SHP2 knockout macrophages); overexpression; cytokine measurement; peritonitis model\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP for SHP2-ANT1 interaction, genetic KO with defined cellular phenotype, and in vivo model; single lab but multiple orthogonal methods\",\n      \"pmids\": [\"29255148\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Mitochondrial GSNOR denitrosylates ANT1 at cysteine 160 (C160). Under heart failure conditions, decreased mitochondrial GSNOR leads to elevated S-nitrosylation of ANT1 at C160, impairing mitochondrial membrane potential and mitophagy. Overexpression of non-nitrosylatable ANT1 C160A mutant or mitochondrial GSNOR improved mitochondrial function.\",\n      \"method\": \"Biotin-switch assay; LC-MS/MS identification of S-nitrosylation site (C160); cellular fractionation; immunofluorescence; cardiac-specific GSNOR KO mouse; AAV9-mediated mitochondria-targeted GSNOR overexpression; mitochondrial function assays\",\n      \"journal\": \"Circulation research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — MS-identified modification site validated by mutagenesis (C160A), genetic KO and OE rescue, multiple orthogonal methods in one study\",\n      \"pmids\": [\"37377022\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"ANT1 mutations (equivalent to adPEO and cardiomyopathy/myopathy mutations) cause protein misfolding in the yeast inner membrane, which disrupts the assembly and stability of multiple protein complexes in the membrane; adPEO-type mutations additionally form large aggregates whereas cardiomyopathy/myopathy-type mutations do not, suggesting these diseases belong to protein misfolding disorders.\",\n      \"method\": \"Yeast Aac2 mutagenesis; native gel electrophoresis of membrane complexes; pulse-chase analysis; fluorescence microscopy of aggregate formation\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — yeast genetic model with multiple orthogonal biochemical methods; single lab but mechanistically detailed\",\n      \"pmids\": [\"25833713\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"ANT1 confers sensitivity of the mitochondrial permeability transition (mPT) pore to the proton electrochemical gradient: cells lacking ANT1 are resistant to Ca2+- and H2O2-induced mitochondrial swelling despite greater membrane potential losses, and permeabilized ANT1-null myotubes show higher calcium uptake capacity and voltage-thresholds of mPT opening.\",\n      \"method\": \"mPT onset assessment by mitochondrial volume measurement ('thinness ratio', cobalt-calcein) in ANT1-deficient human fibroblasts and ANT1-knockdown C2C12 myotubes; Ca2+ measurement by X-rhod-1 and 4mtD3cpv biosensor; cytochrome c release assay\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal techniques on loss-of-function cell models with defined mechanistic readout; single lab\",\n      \"pmids\": [\"27221760\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"De novo dominant ANT1 (SLC25A4) mutations (R80H, R235G) classified as gain-of-function in yeast: introduction into yeast AAC2 in heteroallelic strains (mimicking human heterozygosity) caused more severe OXPHOS phenotypes than the hemiallelic strain, demonstrating gain-of-function dominance rather than haploinsufficiency.\",\n      \"method\": \"Yeast mutagenesis of AAC2 at equivalent positions; phenotypic characterization of hemiallelic vs heteroallelic yeast strains; respiratory growth assay\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis in yeast with heteroallelic vs hemiallelic comparison; single lab, single method, but mechanistically informative\",\n      \"pmids\": [\"28947214\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"NF-κB binds to two NF-κB responsive elements in the ANT1 promoter (+1 to +20 bp and +41 to +61 bp) and represses ANT1 transcription; TNFα-induced NF-κB activation suppresses ANT1 mRNA and protein, impairs ATP/ADP exchange, decreases ATP production, decreases calcium-induced mPTP opening, elevates mitochondrial potential, and increases ROS production.\",\n      \"method\": \"Promoter reporter assay; chromatin immunoprecipitation (ChIP); TNFα stimulation; RT-PCR and western blot; mitochondrial ATP/ADP exchange assay; mitochondrial membrane potential and ROS measurement\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP and promoter assays establish direct transcriptional regulation, functional consequences measured by multiple assays; single lab\",\n      \"pmids\": [\"28877317\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"ANT1 overexpression induces apoptosis by recruiting the IκBα-NF-κB complex to mitochondria, coincident with decreased nuclear NF-κB DNA binding activity, downregulation of anti-apoptotic NF-κB target genes (Bcl-XL, MnSOD2, c-IAP2), and sensitization to apoptosis. ANT2 overexpression does not cause this effect, demonstrating isoform specificity.\",\n      \"method\": \"ANT1 overexpression; subcellular fractionation; western blot for IκBα/NF-κB in mitochondria; NF-κB EMSA (DNA binding); gene expression analysis; apoptosis assays; p65 co-expression rescue experiment\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (fractionation, EMSA, rescue by p65) in single lab; isoform specificity control strengthens mechanism\",\n      \"pmids\": [\"15231833\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"ANT1 isoform, but not ANT2, is responsible for a significant fraction of the high basal proton leak (CAtr-sensitive) in brown-fat mitochondria; ANT2 mediates fatty acid-induced uncoupling in liver mitochondria. Brown adipose tissue expresses both Ant1 and Ant2 mRNA equally, whereas liver expresses only Ant2.\",\n      \"method\": \"Carboxyatractyloside (CAtr) inhibitor experiments on isolated brown-fat and liver mitochondria from wild-type and UCP1−/− mice; respiration measurement; isoform-specific mRNA expression by RT-PCR\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological inhibition with CAtr distinguishing isoforms; indirect inference of ANT1 role from isoform expression pattern; single lab\",\n      \"pmids\": [\"16831128\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"ANT1 activity mediates fatty acid-induced uncoupling in skeletal muscle mitochondria. siRNA-mediated ANT1 knockdown in C2C12 myotubes decreased sensitivity to palmitate-induced uncoupling and impaired insulin-stimulated glucose uptake; in ZDF rat mitochondria, reduced FA-induced uncoupling was abolished by the ANT inhibitor carboxyatractyloside.\",\n      \"method\": \"siRNA knockdown of ANT1 in C2C12 myotubes; mitochondrial respiration assay with oleate/palmitate titration; carboxyatractyloside inhibitor experiment on ZDF rat skeletal muscle mitochondria; insulin-stimulated glucose uptake assay\",\n      \"journal\": \"Diabetologia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA knockdown with functional readout, pharmacological inhibition; single lab, multiple complementary experiments\",\n      \"pmids\": [\"26886198\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"PGC-1α-induced upregulation of ANT1 mediates increased susceptibility to ischemia-reperfusion injury in cardiomyocytes: siRNA knockdown of ANT1 abolished the detrimental effect of PGC-1α overexpression on cell death during anoxia-reoxygenation and preserved mitochondrial membrane potential under H2O2 stress.\",\n      \"method\": \"Adenoviral PGC-1α overexpression in H9c2 cells; Affymetrix gene array; siRNA knockdown of ANT1; anoxia-reoxygenation injury; mitochondrial membrane potential assay; Langendorff perfusion of PGC-1α transgenic mouse hearts\",\n      \"journal\": \"Journal of molecular and cellular cardiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gene array identification + siRNA rescue places ANT1 in pathway; single lab, multiple methods\",\n      \"pmids\": [\"20600099\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"MeCP2 interacts with YY1 and together they repress ANT1 gene transcription; loss of MeCP2 leads to increased ANT1 mRNA and protein levels in human and mouse cell lines, Rett patient fibroblasts, and Mecp2-null mouse brain.\",\n      \"method\": \"Co-immunoprecipitation (MeCP2-YY1 interaction in vitro and in vivo); ANT1 promoter-reporter assay; RT-PCR and western blot in MeCP2-null cells and Mecp2-null mouse brain\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — Co-IP for protein interaction and promoter assay for transcriptional repression; multiple cell/tissue models; single lab\",\n      \"pmids\": [\"20504995\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"In Podospora anserina, adPEO-equivalent ANT1 mutations (A114P, L98P, V289M) dominantly cause decreased mitochondrial inner membrane potential, decreased ROS production, and accumulation of large-scale mtDNA deletions. Suppression of mtDNA instability from M106P and A121P mutations was achieved without restoration of membrane potential, indicating mtDNA instability is not solely caused by reduced membrane potential or altered ROS.\",\n      \"method\": \"Fungal genetics (Podospora anserina); dominant mutation introduction; membrane potential measurement; ROS assay; mtDNA deletion analysis; suppressor genetics (rmp1 and AS1 alleles)\",\n      \"journal\": \"Genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis with suppressor alleles in fungal model; multiple functional readouts; single lab\",\n      \"pmids\": [\"19687137\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Oxidative stress-induced changes in lipid shape (PE adducts, lysolipids) decrease the stored curvature elastic stress (SCES) of the lipid bilayer membrane, which increases the protonophoric activity of ANT1 (and UCP1); ANT1 senses membrane curvature elastic stress to regulate H+ transport.\",\n      \"method\": \"Planar lipid bilayer electrophysiology with ANT1; lipid composition manipulation (OPC, MPC, PE adducts); molecular dynamics simulations of lateral pressure profiles\",\n      \"journal\": \"Antioxidants (Basel, Switzerland)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 / Weak — reconstitution in lipid bilayers with defined lipid compositions and MD simulation; single lab, novel mechanistic claim\",\n      \"pmids\": [\"36552523\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Brain-specific Ant1 heterozygous conditional knockout mice show hyperexcitability of dorsal raphe serotonergic neurons, enhanced serotonin turnover in the nucleus accumbens, upregulation of Maob in dorsal raphe, and accumulation of COX-negative cells in dorsal raphe, linking ANT1 mitochondrial dysfunction to serotonergic dysregulation.\",\n      \"method\": \"Conditional brain-specific Ant1 heterozygous knockout mice; behavioral analysis (IntelliCage, 5-CSRTT); electrophysiology of dorsal raphe neurons; serotonin turnover measurement; immunohistochemistry for COX-negative cells; Maob expression analysis\",\n      \"journal\": \"Molecular psychiatry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO with multiple orthogonal cellular and behavioral readouts; single lab\",\n      \"pmids\": [\"29892051\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Complete loss of ANT1 expression (homozygous splice-site mutation) in a patient causes a clinical syndrome of cardiomyopathy and myopathy, with dramatic mitochondrial proliferation, multiple mtDNA deletions, and abnormal metabolic profile; no compensatory increase in ANT3 transcript was observed.\",\n      \"method\": \"Patient molecular diagnosis; RT-PCR showing absent ANT1 transcript; metabolic profiling; muscle biopsy histology; ANT3 expression measurement\",\n      \"journal\": \"Journal of medical genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — natural human loss-of-function model with multiple biochemical/pathological readouts; single case but definitive null allele\",\n      \"pmids\": [\"22187496\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"A de novo dominant SLC25A4 variant (p.Lys33Gln) expressed in Lactococcus lactis membrane vesicles shows significantly impaired ADP/ATP transport, establishing loss of transport function as the pathogenic mechanism; patient muscle shows decreased complex I, III, and IV protein levels with largely unaffected total AAC content.\",\n      \"method\": \"Expression of mutant AAC1 in Lactococcus lactis; transport assay with fused membrane vesicles; immunohistochemistry and western blot of patient muscle\",\n      \"journal\": \"Neurology. Genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — in vitro transport reconstitution in L. lactis with patient tissue validation; single case/single lab\",\n      \"pmids\": [\"30046662\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"ANT1 acts upstream of the PINK1/Parkin mitophagy pathway: BaP/BPDE exposure suppresses ANT1 expression, leading to decreased PINK1 bound to the outer mitochondrial membrane and reduced Parkin recruitment, thereby impairing mitophagy in ovarian corpus luteum cells. Overexpression of ANT1 partially restores mitophagy and mitochondrial function.\",\n      \"method\": \"In vivo mouse exposure and in vitro KGN cell treatment with BaP/BPDE; ANT1 overexpression; PINK1/Parkin immunofluorescence and western blot; mitochondrial membrane potential and ATP measurement\",\n      \"journal\": \"The Science of the total environment\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — overexpression rescue and pathway component localization; single lab, multiple readouts\",\n      \"pmids\": [\"34986425\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"USP34 deubiquitinates and stabilizes ANT1 protein, thereby promoting PINK1/Parkin-dependent mitophagy in chondrocytes; chondrocyte-specific Usp34 knockout mice develop age-dependent temporomandibular joint osteoarthritis, and USP34 deficiency exacerbates mechanical stress-induced degeneration.\",\n      \"method\": \"Chondrocyte-specific Usp34 knockout mice; co-immunoprecipitation (USP34-ANT1); ubiquitination assay; mitophagy assay; histological analysis of TMJ cartilage\",\n      \"journal\": \"JBMR plus\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — Co-IP and ubiquitination assay establish direct post-translational modification; KO mouse with defined cellular phenotype; single lab\",\n      \"pmids\": [\"41631201\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Drosophila sesB (ANT ortholog) mutant adults show decreased respiratory control ratio, downregulation of cytochrome oxidase, ATP depletion, lactate accumulation, and a metabolic shift toward glycolysis. Female sterility is substantially rescued by somatic expression of alternative oxidase (AOX), while developmental delay was alleviated by an altered mitochondrial DNA background.\",\n      \"method\": \"Bioenergetic analysis of sesB1 mitochondria (respiratory control ratio, COX activity); metabolomics (ATP, lactate); gene expression analysis; AOX transgenic rescue; mtDNA background substitution\",\n      \"journal\": \"Disease models & mechanisms\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple bioenergetic and metabolic readouts in Drosophila ANT model; genetic rescue experiments; single lab\",\n      \"pmids\": [\"24812436\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"The human muscle adenine nucleotide translocator gene (ANT1) is localized to chromosome 4q35 by fluorescence in situ hybridization.\",\n      \"method\": \"Fluorescence in situ hybridization (FISH)\",\n      \"journal\": \"Cytogenetics and cell genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct chromosomal localization by FISH; foundational mapping result confirmed by multiple subsequent studies\",\n      \"pmids\": [\"1582253\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Restoration of just ~10% of Ant1 gene expression via AAV2/9 delivery in neonatal Ant1−/− and Ant1−/−+ND6P25L mouse hearts was sufficient to ameliorate cardiomyopathy, reversing dysregulated mitochondrial metabolic genes including PGC1α, cardiac contractile proteins, and extracellular matrix proteins.\",\n      \"method\": \"AAV2/9-mediated ANT1 cDNA delivery in Ant1 null mice; proteomics; single-nucleus RNA sequencing; cardiac functional analysis\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo gene therapy rescue with multi-omic mechanistic validation; single lab but comprehensive\",\n      \"pmids\": [\"41398158\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"ANT1 knockdown in macrophages reduces IL-6 expression after LPS stimulation; JNK signaling upstream of IL-6 is downregulated by ANT1 loss, while NF-κB signaling and other MAP kinases remain unchanged, placing ANT1 specifically in the JNK-IL-6 axis.\",\n      \"method\": \"ANT1 siRNA knockdown in macrophages; LPS stimulation; cytokine measurement; western blot for JNK, NF-κB, and MAP kinases\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single siRNA experiment identifying signaling pathway; single lab, single method, no rescue\",\n      \"pmids\": [\"30311946\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Misfolding of mutant ANT1 (AAC2 in yeast) clogs TOM and TIM22 protein import complexes, inducing mitochondrial Precursor Overaccumulation Stress (mPOS) in the cytosol; MFB1 (mitochondrial F-box protein) overexpression suppresses growth defects from a clogger allele of AAC2, and its disruption exacerbates import clogging, suggesting MFB1 maintains import competency under ANT1 clogging conditions.\",\n      \"method\": \"Yeast genetics; BioID proximity labeling (Mfb1-Tom22 interaction); cell growth assay; cytosolic protein retention measurement\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 2-3 / Weak — preprint; BioID and genetic suppression data support mechanistic model but single lab, not peer-reviewed\",\n      \"pmids\": [\"bio_10.1101_2025.10.13.682092\"],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"SLC25A4 (ANT1) encodes the heart/muscle isoform of the mitochondrial ADP/ATP carrier that exchanges matrix ATP for cytosolic ADP across the inner mitochondrial membrane; it additionally mediates proton transport in the presence of long-chain fatty acids (fatty acid cycling mechanism) via a positively charged protein-lipid interface including R79; pathogenic missense mutations impair ADP/ATP transport and/or cause protein misfolding/aggregation that clogs the TOM/TIM22 import machinery, dominantly destabilizes mtDNA, and collapses mitochondrial membrane potential; ANT1 also confers voltage-sensitivity to the mitochondrial permeability transition pore, is regulated by S-nitrosylation at C160 (reversed by mitochondrial GSNOR) and ubiquitination (reversed by USP34), acts upstream of the PINK1/Parkin mitophagy pathway, and its transcription is repressed by the NF-κB and MeCP2/YY1 complexes.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"SLC25A4 (ANT1) is the heart/muscle isoform of the mitochondrial ADP/ATP carrier that exchanges matrix ATP for cytosolic ADP across the inner membrane, a function established directly by reconstitution and transport assays in which pathogenic mutants are impaired [#0, #1, #20]. Beyond nucleotide exchange, reconstitution of purified ANT1 in planar lipid bilayers shows it mediates H+ transport only in the presence of long-chain fatty acids, consistent with a fatty acid cycling mechanism in which FA anions slide along the positively charged protein-lipid interface and are protonated at R79, a residue that also governs ADP/ATP and inhibitor (carboxyatractyloside, bongkrekic acid) binding [#3, #4]; this protonophoric activity is sensitive to membrane curvature elastic stress set by bilayer lipid composition [#17], and ANT1 mediates fatty-acid-induced uncoupling in skeletal muscle and brown-fat mitochondria [#12, #13]. ANT1 also confers voltage-sensitivity to the mitochondrial permeability transition pore, since cells lacking ANT1 resist Ca2+- and H2O2-induced swelling and show altered mPT voltage thresholds [#8]. Pathogenic missense mutations act dominantly: equivalent substitutions in yeast and Podospora impair ADP/ATP exchange, destabilize mtDNA as a dominant (gain-of-function) trait, and—for adPEO-type alleles—misfold and aggregate in the inner membrane, disrupting assembly of multiple membrane complexes [#2, #7, #9, #16], while complete loss of ANT1 in a patient causes cardiomyopathy/myopathy with mitochondrial proliferation and multiple mtDNA deletions [#19]. ANT1 is embedded in regulatory networks controlling its abundance and activity: its transcription is repressed by NF-κB and by the MeCP2/YY1 complex [#10, #15], it is dephosphorylated by mitochondrial SHP2 to limit NLRP3 inflammasome hyperactivation [#5], denitrosylated at C160 by mitochondrial GSNOR to preserve membrane potential and mitophagy [#6], and stabilized by USP34-mediated deubiquitination to support PINK1/Parkin mitophagy [#22]; ANT1 itself acts upstream of PINK1/Parkin recruitment [#21]. Restoring ~10% of Ant1 expression rescues murine cardiomyopathy, confirming dosage-sensitive control of cardiac mitochondrial gene programs [#25].\",\n  \"teleology\": [\n    {\n      \"year\": 1992,\n      \"claim\": \"Establishing the genomic locus of the muscle ADP/ATP translocator provided the foundation for linking ANT1 to human disease.\",\n      \"evidence\": \"Fluorescence in situ hybridization mapping ANT1 to chromosome 4q35\",\n      \"pmids\": [\"1582253\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mapping alone establishes no function or mechanism\", \"No allelic disease association at this stage\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Modeling adPEO-equivalent mutations in yeast first showed that pathogenic ANT1 alleles impair ADP/ATP exchange and destabilize mtDNA dominantly, distinguishing the disease mechanism from simple loss of function.\",\n      \"evidence\": \"Yeast AAC2 complementation with transport assays, cytochrome spectroscopy, and heteroallelic mtDNA stability tests\",\n      \"pmids\": [\"15016764\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Yeast model does not directly establish the human residue-level transport defect\", \"Does not resolve whether dominance arises from aggregation or altered transport\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"ANT1 overexpression was shown to trigger apoptosis by recruiting the IκBα–NF-κB complex to mitochondria in an isoform-specific manner, linking the carrier to cell-death signaling.\",\n      \"evidence\": \"Overexpression with subcellular fractionation, NF-κB EMSA, and p65 rescue; ANT2 negative control\",\n      \"pmids\": [\"15231833\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Overexpression may not reflect endogenous behavior\", \"Direct ANT1–IκBα binding not demonstrated\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Pharmacological dissection of brown-fat versus liver mitochondria identified ANT1 as a contributor to basal proton leak, extending its role beyond nucleotide exchange.\",\n      \"evidence\": \"Carboxyatractyloside inhibition of respiration in isolated mitochondria with isoform-specific expression analysis\",\n      \"pmids\": [\"16831128\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"ANT1 role inferred indirectly from isoform expression pattern\", \"Molecular basis of proton conductance not resolved here\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Suppressor genetics in Podospora showed that mtDNA instability from ANT1 mutations is not solely caused by reduced membrane potential or ROS, separating these phenotypes.\",\n      \"evidence\": \"Fungal dominant mutation analysis with membrane potential, ROS, mtDNA deletion, and suppressor allele tests\",\n      \"pmids\": [\"19687137\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Causal pathway from carrier dysfunction to mtDNA deletion remains undefined\", \"Fungal model may not capture mammalian specifics\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Two studies placed ANT1 abundance under physiological control—repression by MeCP2/YY1 and induction by PGC-1α—linking ANT1 dosage to neuronal (Rett) and cardiac ischemia phenotypes.\",\n      \"evidence\": \"MeCP2-YY1 Co-IP and promoter reporters in null cells/brain; PGC-1α overexpression with gene array and ANT1 siRNA rescue in cardiomyocytes\",\n      \"pmids\": [\"20504995\", \"20600099\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct transcription-factor occupancy of the endogenous locus in vivo not fully resolved for all factors\", \"How ANT1 dosage mechanistically drives ischemia-reperfusion injury not defined\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Expression of adPEO mutant ANT1 in mammalian myotubes demonstrated a dominant gain-of-function with abnormal reversal potential, refining the disease mechanism in disease-relevant cells.\",\n      \"evidence\": \"Mutant ANT1 in mouse myotubes with ADP-ATP exchange assay, electrophysiology, and siRNA controls\",\n      \"pmids\": [\"21586654\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not address mtDNA instability mechanism\", \"Aggregation contribution not assessed in this system\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"A human homozygous null established that complete ANT1 loss causes cardiomyopathy/myopathy with mtDNA deletions and no ANT3 compensation, defining the loss-of-function phenotype.\",\n      \"evidence\": \"Patient molecular diagnosis, RT-PCR, metabolic profiling, and muscle histology\",\n      \"pmids\": [\"22187496\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single case\", \"Mechanism connecting null allele to mtDNA deletions not resolved\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Yeast biochemistry revealed that adPEO mutations cause inner-membrane misfolding and aggregation that disrupt multiple membrane complexes, reframing these diseases as protein-misfolding disorders.\",\n      \"evidence\": \"Yeast Aac2 mutagenesis with native gels, pulse-chase, and aggregate microscopy\",\n      \"pmids\": [\"25833713\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Aggregation demonstrated in yeast, not in human muscle\", \"Relative contribution of misfolding versus transport defect to pathology unresolved\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Direct transport reconstitution of patient mutants plus muscle biochemistry confirmed severe ADP/ATP transport impairment with mtDNA loss and respiratory deficiency.\",\n      \"evidence\": \"Recombinant R80H/R235G transport assays with orthogonal patient muscle analysis\",\n      \"pmids\": [\"27693233\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not distinguish transport defect from misfolding contribution in vivo\", \"Mechanism of dominance addressed separately\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Loss-of-function cell models established ANT1 as the determinant conferring proton-gradient voltage sensitivity to the permeability transition pore.\",\n      \"evidence\": \"mPT swelling, calcium uptake, and voltage-threshold assays in ANT1-deficient fibroblasts and knockdown myotubes\",\n      \"pmids\": [\"27221760\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether ANT1 is a structural pore component or a regulator not resolved\", \"Single lab\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"ANT1 was shown to mediate fatty-acid-induced uncoupling in skeletal muscle with consequences for insulin-stimulated glucose uptake, tying its uncoupling activity to metabolism.\",\n      \"evidence\": \"siRNA knockdown in C2C12 myotubes and carboxyatractyloside inhibition in ZDF rat mitochondria with respiration and glucose-uptake assays\",\n      \"pmids\": [\"26886198\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular mechanism of proton transport not addressed here\", \"In vivo physiological relevance not established\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"ANT1 was identified as a post-translational target of mitochondrial SHP2 that limits NLRP3 inflammasome hyperactivation, and as a transcriptional target repressed by NF-κB.\",\n      \"evidence\": \"SHP2-ANT1 Co-IP, macrophage SHP2 KO, and peritonitis model; NF-κB ChIP and promoter reporter with mitochondrial functional assays\",\n      \"pmids\": [\"29255148\", \"28877317\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"SHP2 phosphosite on ANT1 not mapped\", \"How dephosphorylation alters carrier activity unresolved\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Yeast heteroallelic versus hemiallelic comparison demonstrated that de novo dominant ANT1 mutations are gain-of-function rather than haploinsufficient, and a separate L. lactis reconstitution defined loss of transport as the pathogenic mechanism for p.Lys33Gln.\",\n      \"evidence\": \"Yeast AAC2 genetic epistasis and L. lactis membrane-vesicle transport assay with patient muscle validation\",\n      \"pmids\": [\"28947214\", \"30046662\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Different alleles may act through different mechanisms\", \"Single-case reconstitution studies\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"A brain-specific Ant1 conditional knockout linked ANT1 mitochondrial dysfunction to serotonergic neuronal dysregulation, expanding the phenotypic reach of ANT1 deficiency.\",\n      \"evidence\": \"Conditional heterozygous Ant1 KO mice with electrophysiology, serotonin turnover, and COX histochemistry\",\n      \"pmids\": [\"29892051\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanistic link from carrier loss to neuronal hyperexcitability undefined\", \"Single lab\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Bilayer reconstitution of purified ANT1 directly demonstrated fatty-acid-dependent H+ transport inhibited by nucleotides and ANT-specific inhibitors, establishing a fatty acid cycling mechanism.\",\n      \"evidence\": \"Planar lipid bilayer electrophysiology, FCS quantification, and molecular dynamics\",\n      \"pmids\": [\"33801254\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological role of this proton transport in vivo not established here\", \"Stoichiometry of FA cycling not defined\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"ANT1 was placed upstream of the PINK1/Parkin mitophagy pathway, and its protonophoric activity shown to respond to membrane curvature elastic stress, connecting lipid biophysics to ANT1 function.\",\n      \"evidence\": \"BaP/BPDE exposure with ANT1 overexpression and PINK1/Parkin localization; bilayer electrophysiology with defined lipid compositions and MD lateral-pressure simulations\",\n      \"pmids\": [\"34986425\", \"36552523\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How ANT1 mechanistically promotes PINK1 OMM retention unresolved\", \"Membrane-stress sensing not validated in intact mitochondria\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Two studies defined residue-level mechanisms: R79 protonates sliding FA anions and governs nucleotide/inhibitor binding, while GSNOR-mediated denitrosylation at C160 preserves membrane potential and mitophagy in heart failure.\",\n      \"evidence\": \"Bilayer electrophysiology with site-directed mutagenesis and MD; biotin-switch/LC-MS/MS, C160A mutagenesis, cardiac GSNOR KO and AAV9 rescue\",\n      \"pmids\": [\"37762012\", \"37377022\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Interplay between R79 transport role and FA protonation not fully separated\", \"Upstream control of mitochondrial GSNOR not defined\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Gene therapy and post-translational stabilization studies established ANT1 dosage control: ~10% Ant1 restoration rescues murine cardiomyopathy, and USP34 deubiquitination stabilizes ANT1 to drive PINK1/Parkin mitophagy.\",\n      \"evidence\": \"AAV2/9 Ant1 delivery with proteomics and snRNA-seq; chondrocyte Usp34 KO mice with USP34-ANT1 Co-IP and ubiquitination assays\",\n      \"pmids\": [\"41398158\", \"41631201\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"USP34 ubiquitination site on ANT1 not mapped\", \"Threshold relationship between ANT1 dose and tissue rescue not generalized beyond heart\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How mutant ANT1 misfolding clogs the mitochondrial import machinery and how this is buffered remains to be resolved at the mechanistic level.\",\n      \"evidence\": \"Preprint yeast BioID and genetic suppression implicating TOM/TIM22 clogging and MFB1\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Preprint, not peer-reviewed\", \"Import-clogging mechanism not demonstrated in mammalian cells\", \"Relationship between import clogging and the established aggregation phenotype unresolved\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005215\", \"supporting_discovery_ids\": [0, 1, 2, 20]},\n      {\"term_id\": \"GO:0140104\", \"supporting_discovery_ids\": [0, 3, 20]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [8]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [3, 4, 17]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [0, 3, 5, 7, 8]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [0, 12, 13]},\n      {\"term_id\": \"R-HSA-382551\", \"supporting_discovery_ids\": [0, 1, 3, 20]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [21, 22]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [8, 11]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [5, 26]}\n    ],\n    \"complexes\": [\"mitochondrial permeability transition pore\"],\n    \"partners\": [\"SHP2\", \"USP34\", \"MeCP2\", \"YY1\", \"NFKB1\", \"IKBA\", \"GSNOR\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":{"gene":"SLC25A4","tier":"GROUNDING","verdict":"Evidence-grounding concern","subtype":"fabrication","uniprot_band":"rich","rules_fired":"R7","issue":"R7: fabricated (no corpus paper): 28877317"},"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}