{"gene":"NDUFC2","run_date":"2026-06-10T05:19:52","timeline":{"discoveries":[{"year":2016,"finding":"Ndufc2 disruption altered complex I assembly and activity, reduced mitochondrial membrane potential and ATP levels, and increased reactive oxygen species production and inflammation both in vitro and in vivo, establishing Ndufc2 as required for mitochondrial complex I function.","method":"Ndufc2 knock-out rat model (in vivo) and in vitro cellular studies; microarray expression analysis; functional assays for complex I activity, membrane potential, ATP, and ROS","journal":"Journal of the American Heart Association","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal functional readouts (complex I activity, membrane potential, ATP, ROS) in both in vitro and in vivo genetic loss-of-function models, replicated across cell types","pmids":["26888427"],"is_preprint":false},{"year":2017,"finding":"Ndufc2 deficiency causes marked mitochondrial dysfunction with increased ROS, loss of internal cristae, and ultrastructural impairment of mitochondrial morphology in rat heterozygous knock-out fibroblasts and human PBMCs homozygous for the rs11237379 variant; stress stimuli (high-NaCl, LPS) exacerbate the damage, and resveratrol counteracts ROS generation.","method":"In vitro fibroblasts from Ndufc2 heterozygous KO rats; human PBMCs; transmission electron microscopy for ultrastructural analysis; ROS/ATP assays; pharmacological intervention with resveratrol","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (TEM ultrastructure, ROS, ATP) in a single lab, clean genetic model","pmids":["28973657"],"is_preprint":false},{"year":2020,"finding":"Bi-allelic loss-of-function variants in NDUFC2 cause severe defects in complex I activity, subunit expression, and assembly, with complexome profiling revealing aberrant assembly intermediates indicative of stalled biogenesis specifically in the ND2 module of the membrane arm; lentiviral rescue with wild-type NDUFC2 cDNA restored complex I assembly, confirming the causal role of NDUFC2 in membrane arm assembly.","method":"Patient fibroblasts with homozygous NDUFC2 variants; biochemical complex I activity assays; complexome profiling; lentiviral transduction with wild-type NDUFC2 cDNA rescue","journal":"EMBO molecular medicine","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — multiple orthogonal methods (complexome profiling, activity assays, cDNA rescue) in patient-derived cells with disease-causing variants, establishing both necessity and sufficiency of NDUFC2 for ND2-module assembly","pmids":["32969598"],"is_preprint":false},{"year":2019,"finding":"NDUFC2 silencing in human endothelial and vascular smooth muscle cells affected cell viability and angiogenesis and stimulated expression of markers of atherogenesis and plaque rupture, placing NDUFC2-dependent mitochondrial function upstream of vascular inflammatory signaling.","method":"siRNA-mediated NDUFC2 silencing in human vascular cells; cell viability assays; angiogenesis assays; expression analysis of atherogenesis markers","journal":"International journal of cardiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean in vitro loss-of-function with multiple phenotypic readouts (viability, angiogenesis, inflammatory markers) in a single lab","pmids":["30808603"],"is_preprint":false},{"year":2023,"finding":"Ndufc2 silencing in H9c2 and primary rat cardiomyocytes caused cardiomyocyte hypertrophy through mitochondrial dysfunction, identifying SIRT3-AMPK-AKT-MnSOD as the major underlying signaling pathway.","method":"siRNA-mediated Ndufc2 silencing in H9c2 and primary cardiomyocytes; hypertrophy assays; pathway analysis of SIRT3, AMPK, AKT, and MnSOD signaling","journal":"Molecular medicine (Cambridge, Mass.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro loss-of-function with defined pathway (SIRT3-AMPK-AKT-MnSOD) in two cell models, single lab","pmids":["37558995"],"is_preprint":false},{"year":2023,"finding":"NDUFC2 overexpression suppressed NLRP3 inflammasome activation and endothelial-mesenchymal transformation (EndoMT) in human brain microvascular endothelial cells subjected to OGD/R, and rescued SOD1 and CAT mRNA expression, placing NDUFC2 upstream of NLRP3 activation in ischemia-reperfusion injury.","method":"In vitro OGD/R model in HBMECs; NDUFC2 overexpression; NLRP3 KO mouse tMCAO model; markers of EndoMT (α-SMA, CD31); RT-PCR for SOD1 and CAT","journal":"Neuroreport","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gain-of-function and genetic KO experiments with multiple mechanistic readouts in both in vitro and in vivo models, single lab","pmids":["37506315"],"is_preprint":false}],"current_model":"NDUFC2 encodes a structural subunit of mitochondrial respiratory chain complex I that is essential for the assembly of the complex I membrane arm (specifically the ND2 module); its loss causes stalled complex I biogenesis, reduced complex I activity, decreased mitochondrial membrane potential and ATP production, and elevated ROS, which downstream activates the NLRP3 inflammasome and the SIRT3-AMPK-AKT-MnSOD pathway, promoting endothelial-mesenchymal transformation, cardiomyocyte hypertrophy, and vascular inflammation."},"narrative":{"mechanistic_narrative":"NDUFC2 is a structural subunit of mitochondrial respiratory chain complex I required for assembly of the membrane arm, and its loss compromises oxidative phosphorylation while driving downstream oxidative and inflammatory signaling [PMID:26888427, PMID:32969598]. Bi-allelic loss-of-function variants in NDUFC2 produce severe defects in complex I activity, subunit expression, and assembly, with complexome profiling localizing the block to stalled biogenesis of the ND2 module of the membrane arm; lentiviral re-expression of wild-type NDUFC2 restores assembly, establishing it as causal and sufficient for this assembly step [PMID:32969598]. Genetic disruption reduces complex I activity, mitochondrial membrane potential, and ATP while elevating reactive oxygen species and inflammation, accompanied by loss of cristae and ultrastructural mitochondrial damage that is exacerbated by high-NaCl and LPS stress and counteracted by resveratrol [PMID:26888427, PMID:28973657]. This NDUFC2-dependent mitochondrial output sits upstream of vascular and cardiac pathology: loss in endothelial and smooth muscle cells impairs viability and angiogenesis and induces atherogenic markers [PMID:30808603], silencing in cardiomyocytes drives hypertrophy via SIRT3-AMPK-AKT-MnSOD signaling [PMID:37558995], and NDUFC2 overexpression suppresses NLRP3 inflammasome activation and endothelial-mesenchymal transformation in ischemia-reperfusion injury [PMID:37506315].","teleology":[{"year":2016,"claim":"Established that NDUFC2 is functionally required for mitochondrial complex I, linking its loss to a coherent bioenergetic and oxidative phenotype rather than a single readout.","evidence":"Ndufc2 knock-out rat model plus in vitro assays for complex I activity, membrane potential, ATP, and ROS","pmids":["26888427"],"confidence":"High","gaps":["Did not resolve which assembly step or module NDUFC2 contributes to","Mechanism linking ROS to downstream inflammation not defined"]},{"year":2017,"claim":"Connected NDUFC2 deficiency to ultrastructural mitochondrial damage and showed the phenotype is stress-modulated and pharmacologically tractable, refining how loss manifests cellularly.","evidence":"Rat heterozygous KO fibroblasts and human PBMCs with rs11237379 variant; TEM, ROS/ATP assays; resveratrol intervention","pmids":["28973657"],"confidence":"Medium","gaps":["Causal chain from complex I defect to cristae loss not mechanistically dissected","Resveratrol effect on ROS not tied to a defined molecular target"]},{"year":2019,"claim":"Placed NDUFC2-dependent mitochondrial function upstream of vascular inflammatory and atherogenic programs in human vascular cells.","evidence":"siRNA silencing in endothelial and smooth muscle cells; viability, angiogenesis, atherogenesis marker assays","pmids":["30808603"],"confidence":"Medium","gaps":["Signaling intermediates between mitochondrial dysfunction and atherogenic gene expression not identified","In vitro only"]},{"year":2020,"claim":"Resolved the precise molecular role of NDUFC2 as required and sufficient for assembly of the ND2 module of the complex I membrane arm, and established it as a Mendelian disease gene.","evidence":"Patient fibroblasts with homozygous variants; complexome profiling; activity assays; wild-type cDNA rescue","pmids":["32969598"],"confidence":"High","gaps":["Atomic-level role of NDUFC2 within the assembly intermediate not defined","Direct assembly-factor or subunit contacts not mapped"]},{"year":2023,"claim":"Defined a specific signaling axis (SIRT3-AMPK-AKT-MnSOD) through which NDUFC2 loss causes cardiomyocyte hypertrophy, advancing the link from bioenergetic defect to cardiac pathology.","evidence":"siRNA silencing in H9c2 and primary rat cardiomyocytes; hypertrophy and pathway analyses","pmids":["37558995"],"confidence":"Medium","gaps":["Causal ordering within SIRT3-AMPK-AKT-MnSOD not fully established","Single lab, in vitro models"]},{"year":2023,"claim":"Showed NDUFC2 acts upstream of NLRP3 inflammasome activation and endothelial-mesenchymal transformation in ischemia-reperfusion injury, extending its role to inflammatory tissue remodeling.","evidence":"OGD/R model in HBMECs with NDUFC2 overexpression; NLRP3 KO tMCAO mouse; EndoMT markers and antioxidant gene RT-PCR","pmids":["37506315"],"confidence":"Medium","gaps":["Direct molecular link between NDUFC2-dependent ROS and NLRP3 activation not established","Single lab"]},{"year":null,"claim":"How the localized ND2-module assembly defect is mechanistically transduced into the distinct downstream programs (NLRP3 inflammasome, SIRT3-AMPK-AKT-MnSOD, EndoMT) remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model of NDUFC2 within the membrane arm","ROS-to-signaling coupling not mechanistically defined","Tissue-specific downstream pathway selection not explained"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[0,2]}],"localization":[{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[0,1,2]}],"pathway":[{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[0,2]}],"complexes":["mitochondrial respiratory chain complex I","complex I ND2 module"],"partners":[],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"O95298","full_name":"NADH dehydrogenase [ubiquinone] 1 subunit C2","aliases":["Complex I-B14.5b","CI-B14.5b","Human lung cancer oncogene 1 protein","HLC-1","NADH-ubiquinone oxidoreductase subunit B14.5b"],"length_aa":119,"mass_kda":14.2,"function":"Accessory subunit of the mitochondrial membrane respiratory chain NADH dehydrogenase (Complex I), that is believed not to be involved in catalysis but required for the complex assembly. 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/O95298/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/NDUFC2","classification":"Not Classified","n_dependent_lines":483,"n_total_lines":1208,"dependency_fraction":0.39983443708609273},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/NDUFC2","total_profiled":1310},"omim":[{"mim_id":"619170","title":"MITOCHONDRIAL COMPLEX I DEFICIENCY, NUCLEAR TYPE 36; MC1DN36","url":"https://www.omim.org/entry/619170"},{"mim_id":"603845","title":"NADH-UBIQUINONE OXIDOREDUCTASE SUBUNIT C2; NDUFC2","url":"https://www.omim.org/entry/603845"},{"mim_id":"252010","title":"MITOCHONDRIAL COMPLEX I DEFICIENCY, NUCLEAR TYPE 1; MC1DN1","url":"https://www.omim.org/entry/252010"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Mitochondria","reliability":"Approved"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/NDUFC2"},"hgnc":{"alias_symbol":["B14.5b","HLC-1"],"prev_symbol":[]},"alphafold":{"accession":"O95298","domains":[{"cath_id":"1.10.287","chopping":"24-97","consensus_level":"high","plddt":94.2374,"start":24,"end":97}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O95298","model_url":"https://alphafold.ebi.ac.uk/files/AF-O95298-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O95298-F1-predicted_aligned_error_v6.png","plddt_mean":90.94},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=NDUFC2","jax_strain_url":"https://www.jax.org/strain/search?query=NDUFC2"},"sequence":{"accession":"O95298","fasta_url":"https://rest.uniprot.org/uniprotkb/O95298.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O95298/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O95298"}},"corpus_meta":[{"pmid":"26888427","id":"PMC_26888427","title":"Ndufc2 Gene Inhibition Is Associated With Mitochondrial Dysfunction and Increased Stroke Susceptibility in an Animal Model of Complex Human Disease.","date":"2016","source":"Journal of the American Heart Association","url":"https://pubmed.ncbi.nlm.nih.gov/26888427","citation_count":45,"is_preprint":false},{"pmid":"31500202","id":"PMC_31500202","title":"High-Throughput RNA Sequencing Reveals NDUFC2-AS lncRNA Promotes Adipogenic Differentiation in Chinese Buffalo (Bubalus bubalis L).","date":"2019","source":"Genes","url":"https://pubmed.ncbi.nlm.nih.gov/31500202","citation_count":25,"is_preprint":false},{"pmid":"32969598","id":"PMC_32969598","title":"Bi-allelic pathogenic variants in NDUFC2 cause early-onset Leigh syndrome and stalled biogenesis of complex I.","date":"2020","source":"EMBO molecular medicine","url":"https://pubmed.ncbi.nlm.nih.gov/32969598","citation_count":24,"is_preprint":false},{"pmid":"28973657","id":"PMC_28973657","title":"In vitro characterization of mitochondrial function and structure in rat and human cells with a deficiency of the NADH: ubiquinone oxidoreductase Ndufc2 subunit.","date":"2017","source":"Human molecular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/28973657","citation_count":24,"is_preprint":false},{"pmid":"30808603","id":"PMC_30808603","title":"The reduction of NDUFC2 expression is associated with mitochondrial impairment in circulating mononuclear cells of patients with acute coronary syndrome.","date":"2019","source":"International journal of cardiology","url":"https://pubmed.ncbi.nlm.nih.gov/30808603","citation_count":20,"is_preprint":false},{"pmid":"25804238","id":"PMC_25804238","title":"Expression profiling of SCN8A and NDUFC2 genes in colorectal carcinoma.","date":"2015","source":"Experimental oncology","url":"https://pubmed.ncbi.nlm.nih.gov/25804238","citation_count":15,"is_preprint":false},{"pmid":"37558995","id":"PMC_37558995","title":"Polymorphic variants at NDUFC2, encoding a mitochondrial complex I subunit, associate with cardiac hypertrophy in human hypertension.","date":"2023","source":"Molecular medicine (Cambridge, Mass.)","url":"https://pubmed.ncbi.nlm.nih.gov/37558995","citation_count":8,"is_preprint":false},{"pmid":"39675531","id":"PMC_39675531","title":"Targeting the HLC-1, LC-2/ad, and PC-14 lung cancer cell lines by the silver nanoparticles green-formulated by Descurainia sophia leaf extract.","date":"2024","source":"Molecular and cellular probes","url":"https://pubmed.ncbi.nlm.nih.gov/39675531","citation_count":6,"is_preprint":false},{"pmid":"35711349","id":"PMC_35711349","title":"Impact of a NDUFC2 Variant on the Occurrence of Acute Coronary Syndromes.","date":"2022","source":"Frontiers in cardiovascular medicine","url":"https://pubmed.ncbi.nlm.nih.gov/35711349","citation_count":4,"is_preprint":false},{"pmid":"37506315","id":"PMC_37506315","title":"NDUFC2 deficiency exacerbates endothelial mesenchymal transformation during ischemia-reperfusion via NLRP3.","date":"2023","source":"Neuroreport","url":"https://pubmed.ncbi.nlm.nih.gov/37506315","citation_count":2,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":7779,"output_tokens":1711,"usd":0.024501,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":8557,"output_tokens":2334,"usd":0.050568,"stage2_stop_reason":"end_turn"},"total_usd":0.075069,"stage1_batch_id":"msgbatch_013a8chtv3AWyTqv4z4sEF4C","stage2_batch_id":"msgbatch_01AHsuW63vinsvuTgzmQ3n62","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2016,\n      \"finding\": \"Ndufc2 disruption altered complex I assembly and activity, reduced mitochondrial membrane potential and ATP levels, and increased reactive oxygen species production and inflammation both in vitro and in vivo, establishing Ndufc2 as required for mitochondrial complex I function.\",\n      \"method\": \"Ndufc2 knock-out rat model (in vivo) and in vitro cellular studies; microarray expression analysis; functional assays for complex I activity, membrane potential, ATP, and ROS\",\n      \"journal\": \"Journal of the American Heart Association\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal functional readouts (complex I activity, membrane potential, ATP, ROS) in both in vitro and in vivo genetic loss-of-function models, replicated across cell types\",\n      \"pmids\": [\"26888427\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Ndufc2 deficiency causes marked mitochondrial dysfunction with increased ROS, loss of internal cristae, and ultrastructural impairment of mitochondrial morphology in rat heterozygous knock-out fibroblasts and human PBMCs homozygous for the rs11237379 variant; stress stimuli (high-NaCl, LPS) exacerbate the damage, and resveratrol counteracts ROS generation.\",\n      \"method\": \"In vitro fibroblasts from Ndufc2 heterozygous KO rats; human PBMCs; transmission electron microscopy for ultrastructural analysis; ROS/ATP assays; pharmacological intervention with resveratrol\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (TEM ultrastructure, ROS, ATP) in a single lab, clean genetic model\",\n      \"pmids\": [\"28973657\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Bi-allelic loss-of-function variants in NDUFC2 cause severe defects in complex I activity, subunit expression, and assembly, with complexome profiling revealing aberrant assembly intermediates indicative of stalled biogenesis specifically in the ND2 module of the membrane arm; lentiviral rescue with wild-type NDUFC2 cDNA restored complex I assembly, confirming the causal role of NDUFC2 in membrane arm assembly.\",\n      \"method\": \"Patient fibroblasts with homozygous NDUFC2 variants; biochemical complex I activity assays; complexome profiling; lentiviral transduction with wild-type NDUFC2 cDNA rescue\",\n      \"journal\": \"EMBO molecular medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — multiple orthogonal methods (complexome profiling, activity assays, cDNA rescue) in patient-derived cells with disease-causing variants, establishing both necessity and sufficiency of NDUFC2 for ND2-module assembly\",\n      \"pmids\": [\"32969598\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"NDUFC2 silencing in human endothelial and vascular smooth muscle cells affected cell viability and angiogenesis and stimulated expression of markers of atherogenesis and plaque rupture, placing NDUFC2-dependent mitochondrial function upstream of vascular inflammatory signaling.\",\n      \"method\": \"siRNA-mediated NDUFC2 silencing in human vascular cells; cell viability assays; angiogenesis assays; expression analysis of atherogenesis markers\",\n      \"journal\": \"International journal of cardiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean in vitro loss-of-function with multiple phenotypic readouts (viability, angiogenesis, inflammatory markers) in a single lab\",\n      \"pmids\": [\"30808603\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Ndufc2 silencing in H9c2 and primary rat cardiomyocytes caused cardiomyocyte hypertrophy through mitochondrial dysfunction, identifying SIRT3-AMPK-AKT-MnSOD as the major underlying signaling pathway.\",\n      \"method\": \"siRNA-mediated Ndufc2 silencing in H9c2 and primary cardiomyocytes; hypertrophy assays; pathway analysis of SIRT3, AMPK, AKT, and MnSOD signaling\",\n      \"journal\": \"Molecular medicine (Cambridge, Mass.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro loss-of-function with defined pathway (SIRT3-AMPK-AKT-MnSOD) in two cell models, single lab\",\n      \"pmids\": [\"37558995\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"NDUFC2 overexpression suppressed NLRP3 inflammasome activation and endothelial-mesenchymal transformation (EndoMT) in human brain microvascular endothelial cells subjected to OGD/R, and rescued SOD1 and CAT mRNA expression, placing NDUFC2 upstream of NLRP3 activation in ischemia-reperfusion injury.\",\n      \"method\": \"In vitro OGD/R model in HBMECs; NDUFC2 overexpression; NLRP3 KO mouse tMCAO model; markers of EndoMT (α-SMA, CD31); RT-PCR for SOD1 and CAT\",\n      \"journal\": \"Neuroreport\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain-of-function and genetic KO experiments with multiple mechanistic readouts in both in vitro and in vivo models, single lab\",\n      \"pmids\": [\"37506315\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"NDUFC2 encodes a structural subunit of mitochondrial respiratory chain complex I that is essential for the assembly of the complex I membrane arm (specifically the ND2 module); its loss causes stalled complex I biogenesis, reduced complex I activity, decreased mitochondrial membrane potential and ATP production, and elevated ROS, which downstream activates the NLRP3 inflammasome and the SIRT3-AMPK-AKT-MnSOD pathway, promoting endothelial-mesenchymal transformation, cardiomyocyte hypertrophy, and vascular inflammation.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"NDUFC2 is a structural subunit of mitochondrial respiratory chain complex I required for assembly of the membrane arm, and its loss compromises oxidative phosphorylation while driving downstream oxidative and inflammatory signaling [#0, #2]. Bi-allelic loss-of-function variants in NDUFC2 produce severe defects in complex I activity, subunit expression, and assembly, with complexome profiling localizing the block to stalled biogenesis of the ND2 module of the membrane arm; lentiviral re-expression of wild-type NDUFC2 restores assembly, establishing it as causal and sufficient for this assembly step [#2]. Genetic disruption reduces complex I activity, mitochondrial membrane potential, and ATP while elevating reactive oxygen species and inflammation, accompanied by loss of cristae and ultrastructural mitochondrial damage that is exacerbated by high-NaCl and LPS stress and counteracted by resveratrol [#0, #1]. This NDUFC2-dependent mitochondrial output sits upstream of vascular and cardiac pathology: loss in endothelial and smooth muscle cells impairs viability and angiogenesis and induces atherogenic markers [#3], silencing in cardiomyocytes drives hypertrophy via SIRT3-AMPK-AKT-MnSOD signaling [#4], and NDUFC2 overexpression suppresses NLRP3 inflammasome activation and endothelial-mesenchymal transformation in ischemia-reperfusion injury [#5].\",\n  \"teleology\": [\n    {\n      \"year\": 2016,\n      \"claim\": \"Established that NDUFC2 is functionally required for mitochondrial complex I, linking its loss to a coherent bioenergetic and oxidative phenotype rather than a single readout.\",\n      \"evidence\": \"Ndufc2 knock-out rat model plus in vitro assays for complex I activity, membrane potential, ATP, and ROS\",\n      \"pmids\": [\"26888427\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve which assembly step or module NDUFC2 contributes to\", \"Mechanism linking ROS to downstream inflammation not defined\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Connected NDUFC2 deficiency to ultrastructural mitochondrial damage and showed the phenotype is stress-modulated and pharmacologically tractable, refining how loss manifests cellularly.\",\n      \"evidence\": \"Rat heterozygous KO fibroblasts and human PBMCs with rs11237379 variant; TEM, ROS/ATP assays; resveratrol intervention\",\n      \"pmids\": [\"28973657\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Causal chain from complex I defect to cristae loss not mechanistically dissected\", \"Resveratrol effect on ROS not tied to a defined molecular target\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Placed NDUFC2-dependent mitochondrial function upstream of vascular inflammatory and atherogenic programs in human vascular cells.\",\n      \"evidence\": \"siRNA silencing in endothelial and smooth muscle cells; viability, angiogenesis, atherogenesis marker assays\",\n      \"pmids\": [\"30808603\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Signaling intermediates between mitochondrial dysfunction and atherogenic gene expression not identified\", \"In vitro only\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Resolved the precise molecular role of NDUFC2 as required and sufficient for assembly of the ND2 module of the complex I membrane arm, and established it as a Mendelian disease gene.\",\n      \"evidence\": \"Patient fibroblasts with homozygous variants; complexome profiling; activity assays; wild-type cDNA rescue\",\n      \"pmids\": [\"32969598\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Atomic-level role of NDUFC2 within the assembly intermediate not defined\", \"Direct assembly-factor or subunit contacts not mapped\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Defined a specific signaling axis (SIRT3-AMPK-AKT-MnSOD) through which NDUFC2 loss causes cardiomyocyte hypertrophy, advancing the link from bioenergetic defect to cardiac pathology.\",\n      \"evidence\": \"siRNA silencing in H9c2 and primary rat cardiomyocytes; hypertrophy and pathway analyses\",\n      \"pmids\": [\"37558995\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Causal ordering within SIRT3-AMPK-AKT-MnSOD not fully established\", \"Single lab, in vitro models\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Showed NDUFC2 acts upstream of NLRP3 inflammasome activation and endothelial-mesenchymal transformation in ischemia-reperfusion injury, extending its role to inflammatory tissue remodeling.\",\n      \"evidence\": \"OGD/R model in HBMECs with NDUFC2 overexpression; NLRP3 KO tMCAO mouse; EndoMT markers and antioxidant gene RT-PCR\",\n      \"pmids\": [\"37506315\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct molecular link between NDUFC2-dependent ROS and NLRP3 activation not established\", \"Single lab\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the localized ND2-module assembly defect is mechanistically transduced into the distinct downstream programs (NLRP3 inflammasome, SIRT3-AMPK-AKT-MnSOD, EndoMT) remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural model of NDUFC2 within the membrane arm\", \"ROS-to-signaling coupling not mechanistically defined\", \"Tissue-specific downstream pathway selection not explained\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [0, 2]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [0, 1, 2]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [0, 2]}\n    ],\n    \"complexes\": [\"mitochondrial respiratory chain complex I\", \"complex I ND2 module\"],\n    \"partners\": [],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":4,"faith_total":4,"faith_pct":100.0}}