{"gene":"MT-ND1","run_date":"2026-06-10T02:59:51","timeline":{"discoveries":[{"year":2018,"finding":"ND1 (MT-ND1) is a pivotal core subunit required for both complex I (CI) biogenesis and the dynamic organization of respiratory supercomplexes. Using allotopic re-expression of human ND1 in cells lacking the endogenous protein (due to the m.3571insC truncative mutation), the absence of ND1 was shown to stall the multi-step CI assembly process and alter supramolecular organization of respiratory complexes. A mutation threshold was defined below which CI and supercomplex organization is recovered, establishing that a minimum amount of ND1 protein is required.","method":"Allotopic re-expression of MT-ND1 in ND1-null cybrid cells; Blue Native PAGE for CI assembly; respiratory supercomplex analysis","journal":"International journal of molecular sciences","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — loss-of-function cell model with allotopic rescue, multiple orthogonal biochemical readouts (BN-PAGE, supercomplex analysis), mutation threshold defined, single lab","pmids":["29518970"],"is_preprint":false},{"year":2011,"finding":"High mutant loads of the MTND1 m.3571insC frameshift mutation, causing CI disassembly, destabilize HIF1α through an imbalance of α-ketoglutarate/succinate (α-KG/SA) ratio, even in a genuinely hypoxic environment. A threshold level of mutation was defined above which tumor growth and invasiveness are significantly reduced, establishing a threshold-dependent oncosuppressive mechanism for MTND1 mutations.","method":"Tumor xenograft model with cells harboring different mutation loads; measurement of α-KG/SA ratio; HIF1α stabilization assays; energetic competence and apoptosis assays","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 2 / Moderate — in vivo xenograft combined with multiple biochemical assays (metabolite ratios, HIF1α, apoptosis), mutation threshold mechanistically defined, single lab","pmids":["21852384"],"is_preprint":false},{"year":2021,"finding":"The LHON-associated MT-ND1 m.3460G>A mutation reduces MT-ND1 protein levels (protein instability), leading to defects in CI assembly and activity, respiratory deficiency, diminished mitochondrial ATP production, decreased membrane potential, increased mitochondrial ROS, elevated cytochrome c release and activation of apoptotic proteins (BAK, BAX, PARP, caspases 3/7/9), and impaired PINK1/Parkin-dependent mitophagy.","method":"Cybrid cell model (ρ0 cells fused with patient enucleated cells); Blue Native PAGE; extracellular flux analyzer (oxygen consumption); flow cytometry (MitoSOX ROS); immunofluorescence (apoptosis, mitophagy markers)","journal":"Investigative ophthalmology & visual science","confidence":"High","confidence_rationale":"Tier 2 / Moderate — cybrid model with multiple orthogonal functional assays, mechanistic pathway placement (CI assembly → apoptosis → mitophagy), single lab","pmids":["34311469"],"is_preprint":false},{"year":2012,"finding":"The m.3890G>A/MT-ND1 (p.R195Q) mutation, affecting a conserved ND1 residue, causes a marked reduction of CI activity and CI-dependent ATP synthesis in cybrid cells despite normally assembled CI enzyme, establishing that this mutation impairs CI catalytic function without disrupting overall CI assembly.","method":"Cybrid cell system (mutant mtDNA transfer); CI activity assay; CI-dependent ATP synthesis measurement; CI assembly assessed by Blue Native PAGE","journal":"Biochimica et biophysica acta","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — cybrid model, multiple orthogonal functional assays (activity, ATP synthesis, assembly), mechanistic dissociation of assembly vs. catalytic function, single lab","pmids":["23246842"],"is_preprint":false},{"year":2015,"finding":"Novel MTND1 mutations (m.3365T>C p.Leu20Pro; m.4175G>A p.Trp290*) cause severe muscle-restricted CI deficiency. Despite markedly reduced CI assembly and undetectable ND1 signal by Western blot, residual CI assembly was viable. A compensatory mechanism was identified: upregulation of CI assembly factor transcripts and proteins (shown by RT-PCR and Western blot) that stabilize respiratory chain supercomplexes, partially rescuing the clinical phenotype.","method":"Mitochondrial genome sequencing; CI assembly analysis (Blue Native PAGE); Western blot; real-time PCR for assembly factor expression; heteroplasmy quantification in skeletal muscle","journal":"Clinical science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (BN-PAGE, Western, RT-PCR) in patient tissue, mechanistic insight into compensatory response, single lab, no reconstitution","pmids":["25626417"],"is_preprint":false},{"year":2013,"finding":"The MT-ND1 m.3946G>A (p.E214K) mutation reduces MT-ND1 protein levels (protein stability affected, not transcription), impairs CI assembly and supercomplex (I/III2/IV and I/III2) formation, causes CI deficiency, and significantly increases ROS produced by CI, without affecting ATP steady-state levels under stress conditions.","method":"Whole-exome sequencing for variant identification; RT-PCR (gene expression); Western blot (protein level); Blue Native PAGE (CI assembly and supercomplexes); ATP measurement; ROS assay in patient fibroblasts","journal":"Human mutation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal assays (BN-PAGE, Western, RT-PCR, ATP, ROS) in patient fibroblasts, mechanistically distinguishes transcription vs. protein stability, single lab","pmids":["24105702"],"is_preprint":false},{"year":2020,"finding":"The m.3395A>G mutation in MT-ND1 (p.Y30C) decreases both the activity and quantity of CI due to reduced MT-ND1 protein levels, but does not produce CI subcomplexes, indicating that CI assembly quality is not affected. Structural modeling based on the MT-ND1 crystal structure suggested a mechanism of MT-ND1 degradation caused by this mutation.","method":"Cybrid cell lines; CI enzyme activity assay; Western blot (MT-ND1 protein quantity); Blue Native PAGE (CI assembly, subcomplex detection); structural modeling using crystal structure of bacterial ortholog","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — cybrid model, multiple orthogonal functional assays, mechanistic distinction of activity vs. assembly quality, single lab","pmids":["32011699"],"is_preprint":false},{"year":2022,"finding":"A 7-bp inversion in MT-ND1 (m.3902-3908inv7), producing a triple amino acid substitution, results in a variant complex I that is stably assembled in normal amounts but has no enzymatic activity, as demonstrated using E. coli as a model system. This establishes that the mutation specifically abolishes CI catalytic activity without affecting assembly.","method":"E. coli model system expressing the triple mutant; growth assay; CI assembly quantification; enzymatic activity assay (NADH:ubiquinone oxidoreductase activity)","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — in vitro bacterial reconstitution with activity assay, single lab, model organism system not human cells","pmids":["35234296"],"is_preprint":false},{"year":2023,"finding":"The MT-ND1 m.3571_3572insC frameshift variant causes CI deficiency and impairs mitochondrial respiration. Cell clones with different mutation loads showed that m.3571_3572insC causes loss of CI by BN-PAGE, impairs oxygen consumption rate and ATP production, increases lactate, decreases mitochondrial membrane potential, increases mitochondrial ROS, and reduces cell growth capacity.","method":"Patient-derived fibroblast clones with variable mutation loads; Blue Native PAGE (CI assembly); Seahorse extracellular flux analyzer (OCR, ATP); lactate assay; mitochondrial membrane potential; ROS; competitive cell growth assay","journal":"Gene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — isogenic clones with dose-response, multiple orthogonal functional assays, single lab","pmids":["36717040"],"is_preprint":false},{"year":2017,"finding":"Overexpression of the nuclear gene MRPS18C (encoding mitochondrial ribosomal protein bS18m) suppresses the biochemical defects caused by the MT-ND1 m.3946G>A (p.E214K) mutation, recovering CI activity and reducing ROS to normal levels in patient fibroblasts. This identifies MRPS18C as a positive modifier/suppressor gene for MT-ND1 mutation-induced CI deficiency.","method":"Functional complementation screen (cDNA library transfection into patient fibroblasts with metabolic selection); MRPS18C overexpression; CI activity assay; ROS measurement","journal":"Human genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional rescue with specific gene overexpression validated by enzymatic activity and ROS assays, epistasis-type approach, single lab","pmids":["28526948"],"is_preprint":false},{"year":2016,"finding":"The MT-ND1 m.3634A>G (p.Ser110Gly) mutation decreases Complex I enzyme activity, reduces cell proliferation, and decreases mitochondrial membrane potential in cybrid cells, supporting its pathogenic role in LHON.","method":"Cybrid cell model; CI enzyme activity assay; cell proliferation assay; mitochondrial membrane potential measurement; in silico structural modeling","journal":"Biochimica et biophysica acta. Molecular basis of disease","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — cybrid model with multiple assays but single lab and limited mechanistic depth","pmids":["27613247"],"is_preprint":false},{"year":2024,"finding":"The MT-ND1 m.3635G>A (p.S110N) mutation disrupts electrostatic interactions between S110 of MT-ND1 and E4/M1 of NDUFA1 within CI, altering CI assembly and function. Cybrid cells exhibit CI activity deficiency, impaired mitochondrial respiration, depolarized membrane potential, elevated cytochrome c release, activation of caspases 3/7/9 and PARP (apoptosis), and impaired PINK1/Parkin-dependent mitophagy with accumulation of P62.","method":"Cybrid cell model; structural analysis of MT-ND1/NDUFA1 interaction; CI activity assay; mitochondrial respiration assay; membrane potential measurement; cytochrome c release; Western blot (apoptosis and mitophagy markers including LC3, P62, PARP, caspases)","journal":"Gene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — cybrid model with multiple orthogonal assays, structural interaction identified, pathway placement (CI → apoptosis/mitophagy), single lab","pmids":["39147111"],"is_preprint":false},{"year":2023,"finding":"A rare MT-ND1 variant m.4135T>C (p.Tyr277His) leads to successfully assembled CI but with disturbed supercomplex formation and markedly reduced CI enzymatic activity, suggesting the mutation stabilizes CI in its inactive form, establishing that Tyr277 of ND1 is critical for CI activity and supercomplex stability rather than assembly per se.","method":"Patient muscle and fibroblast functional studies; CI activity assay; supercomplex analysis (BN-PAGE); CI assembly assessment","journal":"Frontiers in genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — patient tissue and fibroblasts with BN-PAGE and enzyme activity, mechanistically distinguishes assembly from activity/supercomplex organization, single case/lab","pmids":["37274791"],"is_preprint":false},{"year":2006,"finding":"A 7-bp intragenic inversion within MTND1 causes CI deficiency. Transmitochondrial cybrid cells containing high mutant loads of the inversion expressed the biochemical defect (CI deficiency) but showed apparently normal levels of assembled CI complex, indicating the mutation impairs CI function without blocking overall CI assembly.","method":"Cybrid cells (transmitochondrial hybrids) with defined mutation loads; CI activity/assembly analysis; tissue-level heteroplasmy quantification","journal":"Pediatric research","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — cybrid model establishing genotype-phenotype relationship, single lab, limited mechanistic depth","pmids":["16492986"],"is_preprint":false},{"year":2013,"finding":"A new MT-ND1 mutation m.3928G>C (p.V208L) causes CI deficiency with intact CI assembly, and response to coenzyme Q was reduced. The V208 residue is located in the coenzyme Q binding pocket of ND1, identifying ND1's coenzyme Q-binding domain as critical for CI enzymatic activity.","method":"Patient clinical and biochemical characterization; CI enzyme activity assay with coenzyme Q titration; CI assembly analysis; sequencing of MT-ND1","journal":"Mitochondrion","confidence":"Low","confidence_rationale":"Tier 3 / Weak — clinical case with enzyme activity assay, no dedicated reconstitution or mutagenesis, limited mechanistic follow-up, single case","pmids":["24063851"],"is_preprint":false}],"current_model":"MT-ND1 encodes the ND1 core subunit of mitochondrial respiratory complex I (CI), which is essential for CI biogenesis (multi-step assembly), catalytic activity (NADH:ubiquinone oxidoreductase), and the organization of CI-containing respiratory supercomplexes; pathogenic mutations in MT-ND1 impair CI assembly and/or activity through mechanisms including protein instability, disruption of the coenzyme Q-binding pocket or subunit interaction interfaces (e.g., with NDUFA1), leading to downstream consequences including HIF1α destabilization via altered α-KG/SA ratios, increased mitochondrial ROS, apoptosis (cytochrome c release, caspase activation), and impaired PINK1/Parkin-dependent mitophagy, with phenotypic severity scaling with mutation load (heteroplasmy threshold effects)."},"narrative":{"mechanistic_narrative":"MT-ND1 encodes the ND1 core subunit of mitochondrial respiratory complex I (CI, NADH:ubiquinone oxidoreductase), where it is indispensable both for the multi-step assembly of the holoenzyme and for the dynamic organization of CI-containing respiratory supercomplexes; allotopic re-expression in ND1-null cells showed that its absence stalls CI assembly and disrupts supramolecular respiratory organization, with a defined threshold of ND1 protein required for recovery [PMID:29518970]. Pathogenic MT-ND1 variants partition mechanistically into two classes. One class destabilizes the ND1 protein, reducing its steady-state level and thereby impairing CI assembly and supercomplex formation, as shown for the LHON-associated m.3460G>A, m.3946G>A (p.E214K), and m.3395A>G (p.Y30C) variants [PMID:34311469, PMID:24105702, PMID:32011699]. The second class leaves CI normally assembled but abolishes catalytic function, exemplified by m.3890G>A (p.R195Q), the 7-bp inversion/inv7 reconstituted in E. coli, and m.4135T>C (p.Y277His), which stabilizes CI in an inactive state and disturbs supercomplex stability [PMID:23246842, PMID:35234296, PMID:37274791]; residues in the coenzyme Q-binding pocket (V208) and at the ND1–NDUFA1 subunit interface (S110) define structural determinants of this activity [PMID:39147111, PMID:24063851]. Downstream of CI failure, ND1 mutations lower ATP production and membrane potential, raise mitochondrial ROS, trigger cytochrome c release with caspase/PARP-dependent apoptosis, and impair PINK1/Parkin-dependent mitophagy [PMID:34311469, PMID:39147111], while high mutant loads destabilize HIF1α via an altered α-ketoglutarate/succinate ratio, producing a threshold-dependent oncosuppressive effect [PMID:21852384]. The biochemical defect is modifiable: the mitochondrial ribosomal protein gene MRPS18C suppresses CI deficiency and normalizes ROS when overexpressed [PMID:28526948], and assembly-factor upregulation can partially compensate for ND1 loss [PMID:25626417]. Across these studies phenotypic severity scales with heteroplasmic mutation load through threshold effects [PMID:21852384, PMID:36717040].","teleology":[{"year":2006,"claim":"Established that an MT-ND1 mutation can cause CI deficiency without blocking holoenzyme assembly, raising the question of whether ND1 acts in assembly, catalysis, or both.","evidence":"Transmitochondrial cybrids with defined loads of a 7-bp intragenic inversion; CI activity and assembly analysis","pmids":["16492986"],"confidence":"Medium","gaps":["Did not resolve which catalytic step is impaired","No structural mechanism for activity loss"]},{"year":2011,"claim":"Connected CI disassembly from ND1 loss to a metabolic-signaling output, showing high mutant loads destabilize HIF1α via the α-KG/succinate ratio and suppress tumor growth in a threshold-dependent manner.","evidence":"Xenograft model of cells with graded m.3571insC loads; α-KG/SA measurement; HIF1α and apoptosis assays","pmids":["21852384"],"confidence":"High","gaps":["Threshold values are mutation/context specific","Mechanism linking metabolite ratio to HIF1α prolyl hydroxylation not directly dissected here"]},{"year":2012,"claim":"Dissociated catalytic function from assembly, showing a conserved-residue mutation cripples CI activity and ATP synthesis with a normally assembled enzyme.","evidence":"Cybrids carrying m.3890G>A (p.R195Q); CI activity, ATP synthesis, and BN-PAGE assembly assays","pmids":["23246842"],"confidence":"High","gaps":["Structural basis of the catalytic lesion not defined","Effect on ubiquinone handling not measured"]},{"year":2013,"claim":"Defined a protein-stability class of mutations, showing m.3946G>A reduces ND1 protein (not transcript), impairs CI/supercomplex assembly, and elevates CI-derived ROS.","evidence":"Patient fibroblasts; RT-PCR, Western blot, BN-PAGE, ATP and ROS assays","pmids":["24105702"],"confidence":"Medium","gaps":["Degradation pathway for unstable ND1 not identified","ROS source within CI not localized"]},{"year":2013,"claim":"Localized a functional determinant to the coenzyme Q-binding pocket, with a pocket-residue mutation causing CI deficiency and reduced coenzyme Q response despite intact assembly.","evidence":"Patient characterization of m.3928G>A (p.V208L); CI activity with coenzyme Q titration; assembly analysis","pmids":["24063851"],"confidence":"Low","gaps":["Single clinical case without reconstitution or targeted mutagenesis","Direct Q-binding measurement not performed"]},{"year":2015,"claim":"Revealed a compensatory response to ND1 loss, with upregulation of CI assembly-factor transcripts and proteins that stabilize supercomplexes and partially rescue phenotype.","evidence":"Patient muscle with novel MTND1 mutations; BN-PAGE, Western blot, RT-PCR, heteroplasmy quantification","pmids":["25626417"],"confidence":"Medium","gaps":["Specific assembly factors driving rescue not pinpointed","Tissue-restricted nature of the response unexplained"]},{"year":2016,"claim":"Confirmed pathogenicity of an additional LHON variant, linking reduced CI activity to lowered membrane potential and proliferation defects.","evidence":"Cybrids carrying m.3634A>G (p.S110G); CI activity, proliferation, membrane potential assays, in silico modeling","pmids":["27613247"],"confidence":"Medium","gaps":["Mechanistic depth limited beyond activity readout","No structural validation of modeling"]},{"year":2017,"claim":"Identified a nuclear suppressor gene, showing MRPS18C overexpression rescues CI activity and normalizes ROS in ND1-mutant fibroblasts.","evidence":"cDNA-library complementation screen in patient fibroblasts; MRPS18C overexpression; CI activity and ROS assays","pmids":["28526948"],"confidence":"Medium","gaps":["Molecular mechanism of suppression unresolved","Generality across other ND1 alleles untested"]},{"year":2018,"claim":"Established ND1 as a core subunit required for both CI biogenesis and supercomplex organization, with a minimum protein threshold for recovery.","evidence":"Allotopic re-expression of human ND1 in ND1-null cybrids; BN-PAGE and supercomplex analysis","pmids":["29518970"],"confidence":"High","gaps":["Step in the assembly pathway where ND1 acts not pinpointed","Determinants of supercomplex stability not defined"]},{"year":2020,"claim":"Reinforced the degradation class, showing a mutation reduces ND1 quantity and CI activity without producing subcomplexes, with structural modeling rationalizing ND1 instability.","evidence":"Cybrids carrying m.3395A>G (p.Y30C); CI activity, Western blot, BN-PAGE, structural modeling","pmids":["32011699"],"confidence":"Medium","gaps":["Degradation machinery not identified","Modeling based on bacterial ortholog structure"]},{"year":2022,"claim":"Provided clean reconstitution evidence that an ND1 mutation can abolish catalytic activity while preserving stable assembly.","evidence":"E. coli expression of the inv7 triple-substitution variant; growth, assembly quantification, NADH:ubiquinone oxidoreductase activity","pmids":["35234296"],"confidence":"Medium","gaps":["Bacterial system may not fully recapitulate human CI/supercomplex context","Precise inactivated catalytic step not defined"]},{"year":2023,"claim":"Characterized a frameshift allele in graded isogenic clones, linking CI loss to respiration, ATP, lactate, membrane potential, ROS, and growth defects in a dose-dependent way.","evidence":"Patient fibroblast clones of variable m.3571_3572insC load; BN-PAGE, Seahorse, lactate, membrane potential, ROS, growth assays","pmids":["36717040"],"confidence":"Medium","gaps":["Heteroplasmy threshold value not generalized","Single lab, no in vivo confirmation"]},{"year":2023,"claim":"Showed an ND1 residue critical for activity and supercomplex stability rather than assembly, with the mutant CI stabilized in an inactive form.","evidence":"Patient muscle and fibroblasts with m.4135T>C (p.Y277His); CI activity, BN-PAGE supercomplex and assembly analysis","pmids":["37274791"],"confidence":"Medium","gaps":["Mechanism of inactive-state stabilization not structurally resolved","Single case"]},{"year":2024,"claim":"Mapped a pathogenic mutation to the ND1–NDUFA1 interface, linking interface disruption to CI deficiency, apoptosis, and impaired mitophagy.","evidence":"Cybrids carrying m.3635G>A (p.S110N); structural analysis of ND1/NDUFA1; CI activity, respiration, membrane potential, cytochrome c, caspase/PARP and LC3/P62 readouts","pmids":["39147111"],"confidence":"Medium","gaps":["Direct binding measurement of the interface not performed","Mitophagy impairment mechanism downstream of CI not fully traced"]},{"year":null,"claim":"How ND1 instability is sensed and routed to degradation, and how specific ND1 lesions are mechanistically channeled into apoptosis versus mitophagy versus HIF1α signaling, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No identified protease/quality-control pathway for unstable ND1","Determinants selecting apoptosis vs mitophagy outcomes undefined","Generalizability of MRPS18C suppression across alleles untested"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140098","term_label":"catalytic activity, acting on RNA","supporting_discovery_ids":[3,7]},{"term_id":"GO:0016491","term_label":"oxidoreductase activity","supporting_discovery_ids":[3,7,14]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[0,11,12]}],"localization":[{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[0,2,8]}],"pathway":[{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[0,3,8]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[2,11]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[2,11]}],"complexes":["Mitochondrial respiratory complex I","Respiratory chain supercomplexes (I/III2/IV, I/III2)"],"partners":["NDUFA1","MRPS18C"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P03886","full_name":"NADH-ubiquinone oxidoreductase chain 1","aliases":["NADH dehydrogenase subunit 1"],"length_aa":318,"mass_kda":35.7,"function":"Core subunit of the mitochondrial membrane respiratory chain NADH dehydrogenase (Complex I) which catalyzes electron transfer from NADH through the respiratory chain, using ubiquinone as an electron acceptor (PubMed:1959619). Essential for the catalytic activity and assembly of complex I (PubMed:1959619, PubMed:26929434)","subcellular_location":"Mitochondrion inner membrane","url":"https://www.uniprot.org/uniprotkb/P03886/entry"},"depmap":{"release":"DepMap","has_data":false,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/MT-ND1"},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/MT-ND1","total_profiled":1310},"omim":[],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"heart muscle","ntpm":129323.4}],"url":"https://www.proteinatlas.org/search/MT-ND1"},"hgnc":{"alias_symbol":["ND1","NAD1"],"prev_symbol":["MTND1"]},"alphafold":{"accession":"P03886","domains":[{"cath_id":"-","chopping":"62-307","consensus_level":"medium","plddt":91.3748,"start":62,"end":307}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P03886","model_url":"https://alphafold.ebi.ac.uk/files/AF-P03886-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P03886-F1-predicted_aligned_error_v6.png","plddt_mean":91.75},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=MT-ND1","jax_strain_url":"https://www.jax.org/strain/search?query=MT-ND1"},"sequence":{"accession":"P03886","fasta_url":"https://rest.uniprot.org/uniprotkb/P03886.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P03886/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P03886"}},"corpus_meta":[{"pmid":"18339623","id":"PMC_18339623","title":"The plant defensin, NaD1, 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Section F, Structural biology and crystallization communications","url":"https://pubmed.ncbi.nlm.nih.gov/22232180","citation_count":2,"is_preprint":false},{"pmid":"33884012","id":"PMC_33884012","title":"Molecular Characterization of Fasciola spp. from a Donkey (Equus asinus) Using Partial Sequencing of cox1 and nad1.","date":"2020","source":"Iranian journal of parasitology","url":"https://pubmed.ncbi.nlm.nih.gov/33884012","citation_count":2,"is_preprint":false},{"pmid":"37274791","id":"PMC_37274791","title":"Case report: A rare variant m.4135T>C in the MT-ND1 gene leads to Leber hereditary optic neuropathy and altered respiratory chain supercomplexes.","date":"2023","source":"Frontiers in genetics","url":"https://pubmed.ncbi.nlm.nih.gov/37274791","citation_count":2,"is_preprint":false},{"pmid":"36933066","id":"PMC_36933066","title":"Update on the genetic diversity and population structure of Echinococcus granulosus in Gansu Province, Tibet Autonomous Region, and Xinjiang Uygur Autonomous Region, Western China, inferred from mitochondrial cox1, nad1, and nad5 sequences.","date":"2023","source":"Parasitology research","url":"https://pubmed.ncbi.nlm.nih.gov/36933066","citation_count":1,"is_preprint":false},{"pmid":"27169226","id":"PMC_27169226","title":"[Spatial Distribution of Intron 2 of nad1 Gene Haplotypes in Populations of Norway and Siberian Spruce (Picea abies-P. obovata) Species Complex].","date":"2015","source":"Genetika","url":"https://pubmed.ncbi.nlm.nih.gov/27169226","citation_count":1,"is_preprint":false},{"pmid":"33612820","id":"PMC_33612820","title":"Genetic variation of NADH dehydrogenase subunit 1 (nad1) mitochondrial gene sequence in adult Necator americanus hookworms recovered from a female patient in Thailand.","date":"2020","source":"Tropical biomedicine","url":"https://pubmed.ncbi.nlm.nih.gov/33612820","citation_count":1,"is_preprint":false},{"pmid":"39369025","id":"PMC_39369025","title":"Expression of a novel NaD1 recombinant antimicrobial peptide enhances antifungal and insecticidal activities.","date":"2024","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/39369025","citation_count":0,"is_preprint":false},{"pmid":"39147111","id":"PMC_39147111","title":"Dysregulation of mitochondria, apoptosis and mitophagy in Leber's hereditary optic neuropathy with MT-ND1 3635G>A mutation.","date":"2024","source":"Gene","url":"https://pubmed.ncbi.nlm.nih.gov/39147111","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":46620,"output_tokens":4086,"usd":0.100575,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":12259,"output_tokens":4423,"usd":0.085935,"stage2_stop_reason":"end_turn"},"total_usd":0.18651,"stage1_batch_id":"msgbatch_01BbTCMyrRPyhtEq6b1MdwCN","stage2_batch_id":"msgbatch_011dEed5bbxYvTAaQWKJevxu","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2018,\n      \"finding\": \"ND1 (MT-ND1) is a pivotal core subunit required for both complex I (CI) biogenesis and the dynamic organization of respiratory supercomplexes. Using allotopic re-expression of human ND1 in cells lacking the endogenous protein (due to the m.3571insC truncative mutation), the absence of ND1 was shown to stall the multi-step CI assembly process and alter supramolecular organization of respiratory complexes. A mutation threshold was defined below which CI and supercomplex organization is recovered, establishing that a minimum amount of ND1 protein is required.\",\n      \"method\": \"Allotopic re-expression of MT-ND1 in ND1-null cybrid cells; Blue Native PAGE for CI assembly; respiratory supercomplex analysis\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — loss-of-function cell model with allotopic rescue, multiple orthogonal biochemical readouts (BN-PAGE, supercomplex analysis), mutation threshold defined, single lab\",\n      \"pmids\": [\"29518970\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"High mutant loads of the MTND1 m.3571insC frameshift mutation, causing CI disassembly, destabilize HIF1α through an imbalance of α-ketoglutarate/succinate (α-KG/SA) ratio, even in a genuinely hypoxic environment. A threshold level of mutation was defined above which tumor growth and invasiveness are significantly reduced, establishing a threshold-dependent oncosuppressive mechanism for MTND1 mutations.\",\n      \"method\": \"Tumor xenograft model with cells harboring different mutation loads; measurement of α-KG/SA ratio; HIF1α stabilization assays; energetic competence and apoptosis assays\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo xenograft combined with multiple biochemical assays (metabolite ratios, HIF1α, apoptosis), mutation threshold mechanistically defined, single lab\",\n      \"pmids\": [\"21852384\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"The LHON-associated MT-ND1 m.3460G>A mutation reduces MT-ND1 protein levels (protein instability), leading to defects in CI assembly and activity, respiratory deficiency, diminished mitochondrial ATP production, decreased membrane potential, increased mitochondrial ROS, elevated cytochrome c release and activation of apoptotic proteins (BAK, BAX, PARP, caspases 3/7/9), and impaired PINK1/Parkin-dependent mitophagy.\",\n      \"method\": \"Cybrid cell model (ρ0 cells fused with patient enucleated cells); Blue Native PAGE; extracellular flux analyzer (oxygen consumption); flow cytometry (MitoSOX ROS); immunofluorescence (apoptosis, mitophagy markers)\",\n      \"journal\": \"Investigative ophthalmology & visual science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — cybrid model with multiple orthogonal functional assays, mechanistic pathway placement (CI assembly → apoptosis → mitophagy), single lab\",\n      \"pmids\": [\"34311469\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"The m.3890G>A/MT-ND1 (p.R195Q) mutation, affecting a conserved ND1 residue, causes a marked reduction of CI activity and CI-dependent ATP synthesis in cybrid cells despite normally assembled CI enzyme, establishing that this mutation impairs CI catalytic function without disrupting overall CI assembly.\",\n      \"method\": \"Cybrid cell system (mutant mtDNA transfer); CI activity assay; CI-dependent ATP synthesis measurement; CI assembly assessed by Blue Native PAGE\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — cybrid model, multiple orthogonal functional assays (activity, ATP synthesis, assembly), mechanistic dissociation of assembly vs. catalytic function, single lab\",\n      \"pmids\": [\"23246842\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Novel MTND1 mutations (m.3365T>C p.Leu20Pro; m.4175G>A p.Trp290*) cause severe muscle-restricted CI deficiency. Despite markedly reduced CI assembly and undetectable ND1 signal by Western blot, residual CI assembly was viable. A compensatory mechanism was identified: upregulation of CI assembly factor transcripts and proteins (shown by RT-PCR and Western blot) that stabilize respiratory chain supercomplexes, partially rescuing the clinical phenotype.\",\n      \"method\": \"Mitochondrial genome sequencing; CI assembly analysis (Blue Native PAGE); Western blot; real-time PCR for assembly factor expression; heteroplasmy quantification in skeletal muscle\",\n      \"journal\": \"Clinical science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (BN-PAGE, Western, RT-PCR) in patient tissue, mechanistic insight into compensatory response, single lab, no reconstitution\",\n      \"pmids\": [\"25626417\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"The MT-ND1 m.3946G>A (p.E214K) mutation reduces MT-ND1 protein levels (protein stability affected, not transcription), impairs CI assembly and supercomplex (I/III2/IV and I/III2) formation, causes CI deficiency, and significantly increases ROS produced by CI, without affecting ATP steady-state levels under stress conditions.\",\n      \"method\": \"Whole-exome sequencing for variant identification; RT-PCR (gene expression); Western blot (protein level); Blue Native PAGE (CI assembly and supercomplexes); ATP measurement; ROS assay in patient fibroblasts\",\n      \"journal\": \"Human mutation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal assays (BN-PAGE, Western, RT-PCR, ATP, ROS) in patient fibroblasts, mechanistically distinguishes transcription vs. protein stability, single lab\",\n      \"pmids\": [\"24105702\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"The m.3395A>G mutation in MT-ND1 (p.Y30C) decreases both the activity and quantity of CI due to reduced MT-ND1 protein levels, but does not produce CI subcomplexes, indicating that CI assembly quality is not affected. Structural modeling based on the MT-ND1 crystal structure suggested a mechanism of MT-ND1 degradation caused by this mutation.\",\n      \"method\": \"Cybrid cell lines; CI enzyme activity assay; Western blot (MT-ND1 protein quantity); Blue Native PAGE (CI assembly, subcomplex detection); structural modeling using crystal structure of bacterial ortholog\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — cybrid model, multiple orthogonal functional assays, mechanistic distinction of activity vs. assembly quality, single lab\",\n      \"pmids\": [\"32011699\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"A 7-bp inversion in MT-ND1 (m.3902-3908inv7), producing a triple amino acid substitution, results in a variant complex I that is stably assembled in normal amounts but has no enzymatic activity, as demonstrated using E. coli as a model system. This establishes that the mutation specifically abolishes CI catalytic activity without affecting assembly.\",\n      \"method\": \"E. coli model system expressing the triple mutant; growth assay; CI assembly quantification; enzymatic activity assay (NADH:ubiquinone oxidoreductase activity)\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — in vitro bacterial reconstitution with activity assay, single lab, model organism system not human cells\",\n      \"pmids\": [\"35234296\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"The MT-ND1 m.3571_3572insC frameshift variant causes CI deficiency and impairs mitochondrial respiration. Cell clones with different mutation loads showed that m.3571_3572insC causes loss of CI by BN-PAGE, impairs oxygen consumption rate and ATP production, increases lactate, decreases mitochondrial membrane potential, increases mitochondrial ROS, and reduces cell growth capacity.\",\n      \"method\": \"Patient-derived fibroblast clones with variable mutation loads; Blue Native PAGE (CI assembly); Seahorse extracellular flux analyzer (OCR, ATP); lactate assay; mitochondrial membrane potential; ROS; competitive cell growth assay\",\n      \"journal\": \"Gene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — isogenic clones with dose-response, multiple orthogonal functional assays, single lab\",\n      \"pmids\": [\"36717040\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Overexpression of the nuclear gene MRPS18C (encoding mitochondrial ribosomal protein bS18m) suppresses the biochemical defects caused by the MT-ND1 m.3946G>A (p.E214K) mutation, recovering CI activity and reducing ROS to normal levels in patient fibroblasts. This identifies MRPS18C as a positive modifier/suppressor gene for MT-ND1 mutation-induced CI deficiency.\",\n      \"method\": \"Functional complementation screen (cDNA library transfection into patient fibroblasts with metabolic selection); MRPS18C overexpression; CI activity assay; ROS measurement\",\n      \"journal\": \"Human genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional rescue with specific gene overexpression validated by enzymatic activity and ROS assays, epistasis-type approach, single lab\",\n      \"pmids\": [\"28526948\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"The MT-ND1 m.3634A>G (p.Ser110Gly) mutation decreases Complex I enzyme activity, reduces cell proliferation, and decreases mitochondrial membrane potential in cybrid cells, supporting its pathogenic role in LHON.\",\n      \"method\": \"Cybrid cell model; CI enzyme activity assay; cell proliferation assay; mitochondrial membrane potential measurement; in silico structural modeling\",\n      \"journal\": \"Biochimica et biophysica acta. Molecular basis of disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — cybrid model with multiple assays but single lab and limited mechanistic depth\",\n      \"pmids\": [\"27613247\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"The MT-ND1 m.3635G>A (p.S110N) mutation disrupts electrostatic interactions between S110 of MT-ND1 and E4/M1 of NDUFA1 within CI, altering CI assembly and function. Cybrid cells exhibit CI activity deficiency, impaired mitochondrial respiration, depolarized membrane potential, elevated cytochrome c release, activation of caspases 3/7/9 and PARP (apoptosis), and impaired PINK1/Parkin-dependent mitophagy with accumulation of P62.\",\n      \"method\": \"Cybrid cell model; structural analysis of MT-ND1/NDUFA1 interaction; CI activity assay; mitochondrial respiration assay; membrane potential measurement; cytochrome c release; Western blot (apoptosis and mitophagy markers including LC3, P62, PARP, caspases)\",\n      \"journal\": \"Gene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — cybrid model with multiple orthogonal assays, structural interaction identified, pathway placement (CI → apoptosis/mitophagy), single lab\",\n      \"pmids\": [\"39147111\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"A rare MT-ND1 variant m.4135T>C (p.Tyr277His) leads to successfully assembled CI but with disturbed supercomplex formation and markedly reduced CI enzymatic activity, suggesting the mutation stabilizes CI in its inactive form, establishing that Tyr277 of ND1 is critical for CI activity and supercomplex stability rather than assembly per se.\",\n      \"method\": \"Patient muscle and fibroblast functional studies; CI activity assay; supercomplex analysis (BN-PAGE); CI assembly assessment\",\n      \"journal\": \"Frontiers in genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — patient tissue and fibroblasts with BN-PAGE and enzyme activity, mechanistically distinguishes assembly from activity/supercomplex organization, single case/lab\",\n      \"pmids\": [\"37274791\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"A 7-bp intragenic inversion within MTND1 causes CI deficiency. Transmitochondrial cybrid cells containing high mutant loads of the inversion expressed the biochemical defect (CI deficiency) but showed apparently normal levels of assembled CI complex, indicating the mutation impairs CI function without blocking overall CI assembly.\",\n      \"method\": \"Cybrid cells (transmitochondrial hybrids) with defined mutation loads; CI activity/assembly analysis; tissue-level heteroplasmy quantification\",\n      \"journal\": \"Pediatric research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — cybrid model establishing genotype-phenotype relationship, single lab, limited mechanistic depth\",\n      \"pmids\": [\"16492986\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"A new MT-ND1 mutation m.3928G>C (p.V208L) causes CI deficiency with intact CI assembly, and response to coenzyme Q was reduced. The V208 residue is located in the coenzyme Q binding pocket of ND1, identifying ND1's coenzyme Q-binding domain as critical for CI enzymatic activity.\",\n      \"method\": \"Patient clinical and biochemical characterization; CI enzyme activity assay with coenzyme Q titration; CI assembly analysis; sequencing of MT-ND1\",\n      \"journal\": \"Mitochondrion\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — clinical case with enzyme activity assay, no dedicated reconstitution or mutagenesis, limited mechanistic follow-up, single case\",\n      \"pmids\": [\"24063851\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"MT-ND1 encodes the ND1 core subunit of mitochondrial respiratory complex I (CI), which is essential for CI biogenesis (multi-step assembly), catalytic activity (NADH:ubiquinone oxidoreductase), and the organization of CI-containing respiratory supercomplexes; pathogenic mutations in MT-ND1 impair CI assembly and/or activity through mechanisms including protein instability, disruption of the coenzyme Q-binding pocket or subunit interaction interfaces (e.g., with NDUFA1), leading to downstream consequences including HIF1α destabilization via altered α-KG/SA ratios, increased mitochondrial ROS, apoptosis (cytochrome c release, caspase activation), and impaired PINK1/Parkin-dependent mitophagy, with phenotypic severity scaling with mutation load (heteroplasmy threshold effects).\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"MT-ND1 encodes the ND1 core subunit of mitochondrial respiratory complex I (CI, NADH:ubiquinone oxidoreductase), where it is indispensable both for the multi-step assembly of the holoenzyme and for the dynamic organization of CI-containing respiratory supercomplexes; allotopic re-expression in ND1-null cells showed that its absence stalls CI assembly and disrupts supramolecular respiratory organization, with a defined threshold of ND1 protein required for recovery [#0]. Pathogenic MT-ND1 variants partition mechanistically into two classes. One class destabilizes the ND1 protein, reducing its steady-state level and thereby impairing CI assembly and supercomplex formation, as shown for the LHON-associated m.3460G>A, m.3946G>A (p.E214K), and m.3395A>G (p.Y30C) variants [#2, #5, #6]. The second class leaves CI normally assembled but abolishes catalytic function, exemplified by m.3890G>A (p.R195Q), the 7-bp inversion/inv7 reconstituted in E. coli, and m.4135T>C (p.Y277His), which stabilizes CI in an inactive state and disturbs supercomplex stability [#3, #7, #12]; residues in the coenzyme Q-binding pocket (V208) and at the ND1–NDUFA1 subunit interface (S110) define structural determinants of this activity [#11, #14]. Downstream of CI failure, ND1 mutations lower ATP production and membrane potential, raise mitochondrial ROS, trigger cytochrome c release with caspase/PARP-dependent apoptosis, and impair PINK1/Parkin-dependent mitophagy [#2, #11], while high mutant loads destabilize HIF1\\u03b1 via an altered \\u03b1-ketoglutarate/succinate ratio, producing a threshold-dependent oncosuppressive effect [#1]. The biochemical defect is modifiable: the mitochondrial ribosomal protein gene MRPS18C suppresses CI deficiency and normalizes ROS when overexpressed [#9], and assembly-factor upregulation can partially compensate for ND1 loss [#4]. Across these studies phenotypic severity scales with heteroplasmic mutation load through threshold effects [#1, #8].\",\n  \"teleology\": [\n    {\n      \"year\": 2006,\n      \"claim\": \"Established that an MT-ND1 mutation can cause CI deficiency without blocking holoenzyme assembly, raising the question of whether ND1 acts in assembly, catalysis, or both.\",\n      \"evidence\": \"Transmitochondrial cybrids with defined loads of a 7-bp intragenic inversion; CI activity and assembly analysis\",\n      \"pmids\": [\"16492986\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not resolve which catalytic step is impaired\", \"No structural mechanism for activity loss\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Connected CI disassembly from ND1 loss to a metabolic-signaling output, showing high mutant loads destabilize HIF1\\u03b1 via the \\u03b1-KG/succinate ratio and suppress tumor growth in a threshold-dependent manner.\",\n      \"evidence\": \"Xenograft model of cells with graded m.3571insC loads; \\u03b1-KG/SA measurement; HIF1\\u03b1 and apoptosis assays\",\n      \"pmids\": [\"21852384\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Threshold values are mutation/context specific\", \"Mechanism linking metabolite ratio to HIF1\\u03b1 prolyl hydroxylation not directly dissected here\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Dissociated catalytic function from assembly, showing a conserved-residue mutation cripples CI activity and ATP synthesis with a normally assembled enzyme.\",\n      \"evidence\": \"Cybrids carrying m.3890G>A (p.R195Q); CI activity, ATP synthesis, and BN-PAGE assembly assays\",\n      \"pmids\": [\"23246842\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of the catalytic lesion not defined\", \"Effect on ubiquinone handling not measured\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Defined a protein-stability class of mutations, showing m.3946G>A reduces ND1 protein (not transcript), impairs CI/supercomplex assembly, and elevates CI-derived ROS.\",\n      \"evidence\": \"Patient fibroblasts; RT-PCR, Western blot, BN-PAGE, ATP and ROS assays\",\n      \"pmids\": [\"24105702\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Degradation pathway for unstable ND1 not identified\", \"ROS source within CI not localized\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Localized a functional determinant to the coenzyme Q-binding pocket, with a pocket-residue mutation causing CI deficiency and reduced coenzyme Q response despite intact assembly.\",\n      \"evidence\": \"Patient characterization of m.3928G>A (p.V208L); CI activity with coenzyme Q titration; assembly analysis\",\n      \"pmids\": [\"24063851\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Single clinical case without reconstitution or targeted mutagenesis\", \"Direct Q-binding measurement not performed\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Revealed a compensatory response to ND1 loss, with upregulation of CI assembly-factor transcripts and proteins that stabilize supercomplexes and partially rescue phenotype.\",\n      \"evidence\": \"Patient muscle with novel MTND1 mutations; BN-PAGE, Western blot, RT-PCR, heteroplasmy quantification\",\n      \"pmids\": [\"25626417\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Specific assembly factors driving rescue not pinpointed\", \"Tissue-restricted nature of the response unexplained\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Confirmed pathogenicity of an additional LHON variant, linking reduced CI activity to lowered membrane potential and proliferation defects.\",\n      \"evidence\": \"Cybrids carrying m.3634A>G (p.S110G); CI activity, proliferation, membrane potential assays, in silico modeling\",\n      \"pmids\": [\"27613247\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanistic depth limited beyond activity readout\", \"No structural validation of modeling\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Identified a nuclear suppressor gene, showing MRPS18C overexpression rescues CI activity and normalizes ROS in ND1-mutant fibroblasts.\",\n      \"evidence\": \"cDNA-library complementation screen in patient fibroblasts; MRPS18C overexpression; CI activity and ROS assays\",\n      \"pmids\": [\"28526948\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular mechanism of suppression unresolved\", \"Generality across other ND1 alleles untested\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Established ND1 as a core subunit required for both CI biogenesis and supercomplex organization, with a minimum protein threshold for recovery.\",\n      \"evidence\": \"Allotopic re-expression of human ND1 in ND1-null cybrids; BN-PAGE and supercomplex analysis\",\n      \"pmids\": [\"29518970\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Step in the assembly pathway where ND1 acts not pinpointed\", \"Determinants of supercomplex stability not defined\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Reinforced the degradation class, showing a mutation reduces ND1 quantity and CI activity without producing subcomplexes, with structural modeling rationalizing ND1 instability.\",\n      \"evidence\": \"Cybrids carrying m.3395A>G (p.Y30C); CI activity, Western blot, BN-PAGE, structural modeling\",\n      \"pmids\": [\"32011699\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Degradation machinery not identified\", \"Modeling based on bacterial ortholog structure\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Provided clean reconstitution evidence that an ND1 mutation can abolish catalytic activity while preserving stable assembly.\",\n      \"evidence\": \"E. coli expression of the inv7 triple-substitution variant; growth, assembly quantification, NADH:ubiquinone oxidoreductase activity\",\n      \"pmids\": [\"35234296\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Bacterial system may not fully recapitulate human CI/supercomplex context\", \"Precise inactivated catalytic step not defined\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Characterized a frameshift allele in graded isogenic clones, linking CI loss to respiration, ATP, lactate, membrane potential, ROS, and growth defects in a dose-dependent way.\",\n      \"evidence\": \"Patient fibroblast clones of variable m.3571_3572insC load; BN-PAGE, Seahorse, lactate, membrane potential, ROS, growth assays\",\n      \"pmids\": [\"36717040\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Heteroplasmy threshold value not generalized\", \"Single lab, no in vivo confirmation\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Showed an ND1 residue critical for activity and supercomplex stability rather than assembly, with the mutant CI stabilized in an inactive form.\",\n      \"evidence\": \"Patient muscle and fibroblasts with m.4135T>C (p.Y277His); CI activity, BN-PAGE supercomplex and assembly analysis\",\n      \"pmids\": [\"37274791\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of inactive-state stabilization not structurally resolved\", \"Single case\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Mapped a pathogenic mutation to the ND1–NDUFA1 interface, linking interface disruption to CI deficiency, apoptosis, and impaired mitophagy.\",\n      \"evidence\": \"Cybrids carrying m.3635G>A (p.S110N); structural analysis of ND1/NDUFA1; CI activity, respiration, membrane potential, cytochrome c, caspase/PARP and LC3/P62 readouts\",\n      \"pmids\": [\"39147111\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct binding measurement of the interface not performed\", \"Mitophagy impairment mechanism downstream of CI not fully traced\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How ND1 instability is sensed and routed to degradation, and how specific ND1 lesions are mechanistically channeled into apoptosis versus mitophagy versus HIF1\\u03b1 signaling, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No identified protease/quality-control pathway for unstable ND1\", \"Determinants selecting apoptosis vs mitophagy outcomes undefined\", \"Generalizability of MRPS18C suppression across alleles untested\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140098\", \"supporting_discovery_ids\": [3, 7]},\n      {\"term_id\": \"GO:0016491\", \"supporting_discovery_ids\": [3, 7, 14]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [0, 11, 12]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [0, 2, 8]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [0, 3, 8]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [2, 11]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [2, 11]}\n    ],\n    \"complexes\": [\n      \"Mitochondrial respiratory complex I\",\n      \"Respiratory chain supercomplexes (I/III2/IV, I/III2)\"\n    ],\n    \"partners\": [\n      \"NDUFA1\",\n      \"MRPS18C\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}