{"gene":"NDUFA3","run_date":"2026-06-10T05:19:52","timeline":{"discoveries":[{"year":2014,"finding":"NDUFA3 (along with NDUFA5 and NDUFA12) is required for the formation of a functional mitochondrial complex I holoenzyme; knockdown of NDUFA3 in human cell lines using miRNAs impairs assembly and/or stability of the electron-transferring Q module in the peripheral arm of complex I, as shown by analysis of assembly intermediates.","method":"miRNA-mediated knockdown in human cell lines, analysis of assembly intermediates by blue-native PAGE/immunoblotting","journal":"FEBS letters","confidence":"High","confidence_rationale":"Tier 2 / Moderate — clean knockdown with defined biochemical phenotype (assembly intermediate analysis), single lab but two orthogonal methods (functional activity + assembly intermediate profiling)","pmids":["24717771"],"is_preprint":false},{"year":2023,"finding":"Cryo-EM structures of Drosophila melanogaster complex I revealed a 43-subunit assembly with a hitherto unknown structural homologue to mammalian NDUFA3, confirming NDUFA3's positional conservation in the complex I peripheral arm across species.","method":"Cryo-EM structure determination of isolated Drosophila complex I","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1 / Moderate — high-resolution cryo-EM structural determination in a single rigorous study with detailed subunit assignment","pmids":["36622099"],"is_preprint":false},{"year":2024,"finding":"NDUFA3 overexpression in human nucleus pulposus cells protected against high-glucose-induced mitochondrial dysfunction (reduced ROS, restored mitochondrial membrane potential, improved oxygen consumption rate and complex I activity); NDUFA3 knockdown decreased viability and increased apoptosis reversible by ROS scavenger N-acetylcysteine, placing NDUFA3 upstream of ROS-mediated apoptosis. HDAC/H3K27ac chromatin modification was identified as a regulator of NDUFA3 transcription.","method":"Lentiviral NDUFA3 overexpression and siRNA knockdown in human nucleus pulposus cells; measurement of cell viability, apoptosis, ROS, mitochondrial membrane potential, oxygen consumption rate, complex I activity; HDAC inhibitor and H3K27ac ChIP assays","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gain- and loss-of-function with multiple orthogonal functional readouts, single lab","pmids":["39256449"],"is_preprint":false},{"year":2024,"finding":"In endothelial cells during sepsis, S100A8/A9-mediated suppression of Nrf1 transcription factor downregulates Ndufa3 expression, causing mitochondrial complex I deficiency, which leads to NAD+-dependent Sirt1 suppression, mitochondrial fission, blocked mitophagy, mtDNA release, and ZBP1-mediated PANoptosis.","method":"S100A8/A9 treatment of endothelial cells with measurement of Nrf1 and Ndufa3 expression, complex I activity, Sirt1 activity, mitochondrial morphology/function, and ZBP1-mediated PANoptosis readouts; scRNA-seq and bulk RNA-seq","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal functional readouts in a pathway epistasis framework, single lab","pmids":["38942784"],"is_preprint":false},{"year":2024,"finding":"NDUFA3 is an accessory subunit of mitochondrial complex I; patient cells and HEK293T cells with NDUFA3 knockdown showed reduced levels of both complex I and complex IV, impaired endogenous respiration, and reduced ATP generation. Re-expression of wild-type but not mutant NDUFA3 (p.Arg58His) restored complex I and IV levels, demonstrating functional requirement of NDUFA3 for complex I and IV stability. Zebrafish ndufa3 morpholino knockdown caused delayed locomotor development.","method":"NDUFA3 knockdown in patient fibroblasts and HEK293T cells, wild-type and mutant re-expression rescue experiments, BN-PAGE for complex assembly, Seahorse for respiration/ATP, zebrafish morpholino model with locomotor assay","journal":"Pediatric research","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — rescue with wild-type vs. mutant protein, multiple orthogonal methods (assembly, respiration, ATP, in vivo model), single lab","pmids":["41038977"],"is_preprint":false},{"year":2025,"finding":"Compound heterozygous intronic variants in NDUFA3 (c.86-16_86-15del in intron 2 and c.164-362G>A in intron 3) cause intron retention and Alu-element-driven exonization, resulting in aberrant NDUFA3 splicing. Overexpression of wild-type NDUFA3 in patient-derived fibroblasts restored mitochondrial function, confirming NDUFA3 as a causative gene for Leigh syndrome.","method":"Whole genome sequencing, RNA-seq splicing analysis, Sanger sequencing for phasing, wild-type NDUFA3 overexpression rescue in patient fibroblasts with mitochondrial function readout","journal":"Neurology. Genetics","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — RNA-seq-confirmed splicing defect plus functional rescue with wild-type protein in patient cells, multiple orthogonal methods","pmids":["41404351"],"is_preprint":false},{"year":2024,"finding":"Compound heterozygous mutations in the NDUFA3 gene (identified by whole exome sequencing and minigene testing) were found in three siblings with Leigh syndrome, establishing NDUFA3 as a disease-causing gene for this mitochondrial disorder.","method":"Whole exome sequencing, minigene splicing assay, clinical and radiological characterization","journal":"Neurogenetics","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — genetic identification with minigene functional validation, single family, no direct biochemical rescue experiment","pmids":["39661167"],"is_preprint":false}],"current_model":"NDUFA3 is a supernumerary (accessory) subunit of mitochondrial respiratory complex I that is required for assembly and stability of the Q module in the peripheral (extramembrane) arm of the holoenzyme; loss of NDUFA3 reduces complex I (and complex IV) levels, impairs NADH-dependent respiration and ATP generation, and in pathological contexts promotes ROS accumulation and apoptosis, while its transcription is regulated by HDAC/H3K27ac chromatin modifications; biallelic loss-of-function mutations in NDUFA3 cause Leigh syndrome."},"narrative":{"mechanistic_narrative":"NDUFA3 is a supernumerary (accessory) subunit of mitochondrial respiratory complex I that is required for assembly and stability of the holoenzyme [PMID:24717771, PMID:41038977]. It is positioned in the peripheral (extramembrane) arm, where its knockdown impairs formation of the electron-transferring Q module, a defect resolvable by analysis of complex I assembly intermediates [PMID:24717771]; cryo-EM of Drosophila complex I confirms the positional conservation of an NDUFA3 structural homologue in the peripheral arm [PMID:36622099]. Loss of NDUFA3 reduces the levels of both complex I and complex IV, impairs endogenous respiration, and lowers ATP generation, and re-expression of wild-type — but not the p.Arg58His mutant — protein restores complex I and IV levels, establishing a direct functional requirement [PMID:41038977]. In pathological settings NDUFA3 acts upstream of ROS-mediated cell death: its loss promotes ROS accumulation, loss of mitochondrial membrane potential, and apoptosis reversible by ROS scavenging, and its transcription is controlled by HDAC/H3K27ac chromatin modification [PMID:39256449] and by the Nrf1 transcription factor, whose suppression links NDUFA3 deficiency to mitochondrial fission, blocked mitophagy, and ZBP1-mediated PANoptosis [PMID:38942784]. Biallelic loss-of-function and aberrant-splicing mutations in NDUFA3 cause Leigh syndrome, confirmed by functional rescue in patient-derived fibroblasts [PMID:41038977, PMID:41404351, PMID:39661167].","teleology":[{"year":2014,"claim":"Established that NDUFA3 is functionally required for complex I biogenesis rather than dispensable, by showing its loss stalls assembly at a defined intermediate.","evidence":"miRNA knockdown in human cell lines with blue-native PAGE analysis of assembly intermediates","pmids":["24717771"],"confidence":"High","gaps":["Did not resolve the atomic position of NDUFA3 within the Q module","Mechanism of how NDUFA3 promotes Q module assembly not defined","No in vivo or disease relevance established at this stage"]},{"year":2023,"claim":"Confirmed the structural placement and evolutionary conservation of NDUFA3 in the complex I peripheral arm.","evidence":"Cryo-EM structure determination of isolated Drosophila complex I","pmids":["36622099"],"confidence":"High","gaps":["Structural data from Drosophila homologue, not mammalian NDUFA3 directly","Does not address regulation or pathological roles"]},{"year":2024,"claim":"Demonstrated NDUFA3 dosage controls mitochondrial fitness and ROS-driven apoptosis, and identified chromatin-level transcriptional regulation.","evidence":"Lentiviral overexpression and siRNA knockdown in human nucleus pulposus cells with ROS, membrane potential, OCR, complex I activity readouts; HDAC inhibitor and H3K27ac ChIP assays","pmids":["39256449"],"confidence":"Medium","gaps":["Single cell type (nucleus pulposus) limits generality","Direct transcription factor binding to NDUFA3 not mapped","Causal chain from complex I loss to apoptosis inferred via NAC rescue, not dissected"]},{"year":2024,"claim":"Placed NDUFA3 within an upstream signaling cascade where its suppression triggers a defined cell-death program in sepsis endothelium.","evidence":"S100A8/A9 treatment of endothelial cells with pathway epistasis readouts (Nrf1, complex I activity, Sirt1, mitochondrial morphology, ZBP1-mediated PANoptosis); scRNA-seq and bulk RNA-seq","pmids":["38942784"],"confidence":"Medium","gaps":["Nrf1 regulation of Ndufa3 shown by expression correlation, direct promoter binding not established","Epistasis inferred rather than reconstituted","Findings in disease model; baseline physiological relevance unclear"]},{"year":2024,"claim":"Provided definitive functional proof that NDUFA3 is required for complex I and complex IV stability and that a patient mutation abolishes this function.","evidence":"Knockdown in patient fibroblasts and HEK293T cells, wild-type vs p.Arg58His mutant rescue, BN-PAGE, Seahorse respiration/ATP, zebrafish morpholino locomotor assay","pmids":["41038977"],"confidence":"High","gaps":["Mechanism by which NDUFA3 loss secondarily destabilizes complex IV not explained","Single patient mutation tested for rescue","Zebrafish phenotype not mapped to specific respiratory defect"]},{"year":2024,"claim":"Identified NDUFA3 as a Leigh syndrome disease gene through familial genetic and splicing evidence.","evidence":"Whole exome sequencing, minigene splicing assay, and clinical/radiological characterization in three siblings","pmids":["39661167"],"confidence":"Medium","gaps":["Single family; no direct biochemical rescue performed","Genotype-phenotype correlation limited to one kindred"]},{"year":2025,"claim":"Defined a non-coding splicing mechanism for NDUFA3-related disease and confirmed causality by functional rescue.","evidence":"Whole genome sequencing, RNA-seq splicing analysis, phasing, and wild-type overexpression rescue in patient fibroblasts","pmids":["41404351"],"confidence":"High","gaps":["Alu-element exonization mechanism characterized in patient cells only","Phenotypic spectrum across patients not delineated"]},{"year":null,"claim":"How NDUFA3 loss leads to secondary complex IV destabilization, and the precise atomic mechanism by which it nucleates Q module assembly, remain unresolved.","evidence":"","pmids":[],"confidence":"High","gaps":["No structural model of mammalian NDUFA3 in situ","Coupling between complex I and complex IV stability mechanistically undefined","Direct transcription factor occupancy at the NDUFA3 locus not demonstrated"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[0,1,4]}],"localization":[{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[0,2,4]}],"pathway":[{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[0,4]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[4,5,6]}],"complexes":["mitochondrial respiratory complex I"],"partners":[],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"O95167","full_name":"NADH dehydrogenase [ubiquinone] 1 alpha subcomplex subunit 3","aliases":["Complex I-B9","CI-B9","NADH-ubiquinone oxidoreductase B9 subunit"],"length_aa":84,"mass_kda":9.3,"function":"Accessory subunit of the mitochondrial membrane respiratory chain NADH dehydrogenase (Complex I), that is believed not to be involved in catalysis. Complex I functions in the transfer of electrons from NADH to the respiratory chain. The immediate electron acceptor for the enzyme is believed to be ubiquinone","subcellular_location":"Mitochondrion inner membrane","url":"https://www.uniprot.org/uniprotkb/O95167/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/NDUFA3","classification":"Not Classified","n_dependent_lines":211,"n_total_lines":1208,"dependency_fraction":0.17466887417218543},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"INTS9","stoichiometry":10.0},{"gene":"RER1","stoichiometry":10.0},{"gene":"IGF2BP3","stoichiometry":4.0},{"gene":"ASS1","stoichiometry":0.2},{"gene":"BLVRB","stoichiometry":0.2},{"gene":"CALD1","stoichiometry":0.2},{"gene":"CAPZB","stoichiometry":0.2},{"gene":"CPSF6","stoichiometry":0.2},{"gene":"ESD","stoichiometry":0.2},{"gene":"FKBP5","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/NDUFA3","total_profiled":1310},"omim":[{"mim_id":"603832","title":"NADH-UBIQUINONE OXIDOREDUCTASE SUBUNIT A3; NDUFA3","url":"https://www.omim.org/entry/603832"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"heart muscle","ntpm":603.4}],"url":"https://www.proteinatlas.org/search/NDUFA3"},"hgnc":{"alias_symbol":["B9"],"prev_symbol":[]},"alphafold":{"accession":"O95167","domains":[{"cath_id":"-","chopping":"7-48","consensus_level":"medium","plddt":97.6719,"start":7,"end":48}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O95167","model_url":"https://alphafold.ebi.ac.uk/files/AF-O95167-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O95167-F1-predicted_aligned_error_v6.png","plddt_mean":96.75},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=NDUFA3","jax_strain_url":"https://www.jax.org/strain/search?query=NDUFA3"},"sequence":{"accession":"O95167","fasta_url":"https://rest.uniprot.org/uniprotkb/O95167.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O95167/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O95167"}},"corpus_meta":[{"pmid":"18977241","id":"PMC_18977241","title":"Oxidative stress, telomere length and biomarkers of 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HDAC/H3K27ac chromatin modification was identified as a regulator of NDUFA3 transcription.\",\n      \"method\": \"Lentiviral NDUFA3 overexpression and siRNA knockdown in human nucleus pulposus cells; measurement of cell viability, apoptosis, ROS, mitochondrial membrane potential, oxygen consumption rate, complex I activity; HDAC inhibitor and H3K27ac ChIP assays\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain- and loss-of-function with multiple orthogonal functional readouts, single lab\",\n      \"pmids\": [\"39256449\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"In endothelial cells during sepsis, S100A8/A9-mediated suppression of Nrf1 transcription factor downregulates Ndufa3 expression, causing mitochondrial complex I deficiency, which leads to NAD+-dependent Sirt1 suppression, mitochondrial fission, blocked mitophagy, mtDNA release, and ZBP1-mediated PANoptosis.\",\n      \"method\": \"S100A8/A9 treatment of endothelial cells with measurement of Nrf1 and Ndufa3 expression, complex I activity, Sirt1 activity, mitochondrial morphology/function, and ZBP1-mediated PANoptosis readouts; scRNA-seq and bulk RNA-seq\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal functional readouts in a pathway epistasis framework, single lab\",\n      \"pmids\": [\"38942784\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"NDUFA3 is an accessory subunit of mitochondrial complex I; patient cells and HEK293T cells with NDUFA3 knockdown showed reduced levels of both complex I and complex IV, impaired endogenous respiration, and reduced ATP generation. Re-expression of wild-type but not mutant NDUFA3 (p.Arg58His) restored complex I and IV levels, demonstrating functional requirement of NDUFA3 for complex I and IV stability. Zebrafish ndufa3 morpholino knockdown caused delayed locomotor development.\",\n      \"method\": \"NDUFA3 knockdown in patient fibroblasts and HEK293T cells, wild-type and mutant re-expression rescue experiments, BN-PAGE for complex assembly, Seahorse for respiration/ATP, zebrafish morpholino model with locomotor assay\",\n      \"journal\": \"Pediatric research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — rescue with wild-type vs. mutant protein, multiple orthogonal methods (assembly, respiration, ATP, in vivo model), single lab\",\n      \"pmids\": [\"41038977\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Compound heterozygous intronic variants in NDUFA3 (c.86-16_86-15del in intron 2 and c.164-362G>A in intron 3) cause intron retention and Alu-element-driven exonization, resulting in aberrant NDUFA3 splicing. Overexpression of wild-type NDUFA3 in patient-derived fibroblasts restored mitochondrial function, confirming NDUFA3 as a causative gene for Leigh syndrome.\",\n      \"method\": \"Whole genome sequencing, RNA-seq splicing analysis, Sanger sequencing for phasing, wild-type NDUFA3 overexpression rescue in patient fibroblasts with mitochondrial function readout\",\n      \"journal\": \"Neurology. Genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — RNA-seq-confirmed splicing defect plus functional rescue with wild-type protein in patient cells, multiple orthogonal methods\",\n      \"pmids\": [\"41404351\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Compound heterozygous mutations in the NDUFA3 gene (identified by whole exome sequencing and minigene testing) were found in three siblings with Leigh syndrome, establishing NDUFA3 as a disease-causing gene for this mitochondrial disorder.\",\n      \"method\": \"Whole exome sequencing, minigene splicing assay, clinical and radiological characterization\",\n      \"journal\": \"Neurogenetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — genetic identification with minigene functional validation, single family, no direct biochemical rescue experiment\",\n      \"pmids\": [\"39661167\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"NDUFA3 is a supernumerary (accessory) subunit of mitochondrial respiratory complex I that is required for assembly and stability of the Q module in the peripheral (extramembrane) arm of the holoenzyme; loss of NDUFA3 reduces complex I (and complex IV) levels, impairs NADH-dependent respiration and ATP generation, and in pathological contexts promotes ROS accumulation and apoptosis, while its transcription is regulated by HDAC/H3K27ac chromatin modifications; biallelic loss-of-function mutations in NDUFA3 cause Leigh syndrome.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"NDUFA3 is a supernumerary (accessory) subunit of mitochondrial respiratory complex I that is required for assembly and stability of the holoenzyme [#0, #4]. It is positioned in the peripheral (extramembrane) arm, where its knockdown impairs formation of the electron-transferring Q module, a defect resolvable by analysis of complex I assembly intermediates [#0]; cryo-EM of Drosophila complex I confirms the positional conservation of an NDUFA3 structural homologue in the peripheral arm [#1]. Loss of NDUFA3 reduces the levels of both complex I and complex IV, impairs endogenous respiration, and lowers ATP generation, and re-expression of wild-type — but not the p.Arg58His mutant — protein restores complex I and IV levels, establishing a direct functional requirement [#4]. In pathological settings NDUFA3 acts upstream of ROS-mediated cell death: its loss promotes ROS accumulation, loss of mitochondrial membrane potential, and apoptosis reversible by ROS scavenging, and its transcription is controlled by HDAC/H3K27ac chromatin modification [#2] and by the Nrf1 transcription factor, whose suppression links NDUFA3 deficiency to mitochondrial fission, blocked mitophagy, and ZBP1-mediated PANoptosis [#3]. Biallelic loss-of-function and aberrant-splicing mutations in NDUFA3 cause Leigh syndrome, confirmed by functional rescue in patient-derived fibroblasts [#4, #5, #6].\",\n  \"teleology\": [\n    {\n      \"year\": 2014,\n      \"claim\": \"Established that NDUFA3 is functionally required for complex I biogenesis rather than dispensable, by showing its loss stalls assembly at a defined intermediate.\",\n      \"evidence\": \"miRNA knockdown in human cell lines with blue-native PAGE analysis of assembly intermediates\",\n      \"pmids\": [\"24717771\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Did not resolve the atomic position of NDUFA3 within the Q module\",\n        \"Mechanism of how NDUFA3 promotes Q module assembly not defined\",\n        \"No in vivo or disease relevance established at this stage\"\n      ]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Confirmed the structural placement and evolutionary conservation of NDUFA3 in the complex I peripheral arm.\",\n      \"evidence\": \"Cryo-EM structure determination of isolated Drosophila complex I\",\n      \"pmids\": [\"36622099\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Structural data from Drosophila homologue, not mammalian NDUFA3 directly\",\n        \"Does not address regulation or pathological roles\"\n      ]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Demonstrated NDUFA3 dosage controls mitochondrial fitness and ROS-driven apoptosis, and identified chromatin-level transcriptional regulation.\",\n      \"evidence\": \"Lentiviral overexpression and siRNA knockdown in human nucleus pulposus cells with ROS, membrane potential, OCR, complex I activity readouts; HDAC inhibitor and H3K27ac ChIP assays\",\n      \"pmids\": [\"39256449\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Single cell type (nucleus pulposus) limits generality\",\n        \"Direct transcription factor binding to NDUFA3 not mapped\",\n        \"Causal chain from complex I loss to apoptosis inferred via NAC rescue, not dissected\"\n      ]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Placed NDUFA3 within an upstream signaling cascade where its suppression triggers a defined cell-death program in sepsis endothelium.\",\n      \"evidence\": \"S100A8/A9 treatment of endothelial cells with pathway epistasis readouts (Nrf1, complex I activity, Sirt1, mitochondrial morphology, ZBP1-mediated PANoptosis); scRNA-seq and bulk RNA-seq\",\n      \"pmids\": [\"38942784\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Nrf1 regulation of Ndufa3 shown by expression correlation, direct promoter binding not established\",\n        \"Epistasis inferred rather than reconstituted\",\n        \"Findings in disease model; baseline physiological relevance unclear\"\n      ]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Provided definitive functional proof that NDUFA3 is required for complex I and complex IV stability and that a patient mutation abolishes this function.\",\n      \"evidence\": \"Knockdown in patient fibroblasts and HEK293T cells, wild-type vs p.Arg58His mutant rescue, BN-PAGE, Seahorse respiration/ATP, zebrafish morpholino locomotor assay\",\n      \"pmids\": [\"41038977\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Mechanism by which NDUFA3 loss secondarily destabilizes complex IV not explained\",\n        \"Single patient mutation tested for rescue\",\n        \"Zebrafish phenotype not mapped to specific respiratory defect\"\n      ]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Identified NDUFA3 as a Leigh syndrome disease gene through familial genetic and splicing evidence.\",\n      \"evidence\": \"Whole exome sequencing, minigene splicing assay, and clinical/radiological characterization in three siblings\",\n      \"pmids\": [\"39661167\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Single family; no direct biochemical rescue performed\",\n        \"Genotype-phenotype correlation limited to one kindred\"\n      ]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Defined a non-coding splicing mechanism for NDUFA3-related disease and confirmed causality by functional rescue.\",\n      \"evidence\": \"Whole genome sequencing, RNA-seq splicing analysis, phasing, and wild-type overexpression rescue in patient fibroblasts\",\n      \"pmids\": [\"41404351\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Alu-element exonization mechanism characterized in patient cells only\",\n        \"Phenotypic spectrum across patients not delineated\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How NDUFA3 loss leads to secondary complex IV destabilization, and the precise atomic mechanism by which it nucleates Q module assembly, remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No structural model of mammalian NDUFA3 in situ\",\n        \"Coupling between complex I and complex IV stability mechanistically undefined\",\n        \"Direct transcription factor occupancy at the NDUFA3 locus not demonstrated\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [0, 1, 4]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [0, 2, 4]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [0, 4]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [4, 5, 6]}\n    ],\n    \"complexes\": [\n      \"mitochondrial respiratory complex I\"\n    ],\n    \"partners\": [],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}