{"gene":"MT-ATP6","run_date":"2026-06-10T02:59:51","timeline":{"discoveries":[{"year":1994,"finding":"The mtDNA nt 8993 T→G mutation in the ATP6 gene (encoding ATPase 6 subunit of complex V) directly causes defective mitochondrial H⁺-translocating ATP synthase function: cybrid cells homoplasmic for the mutation showed 24–53% reduction in ADP-stimulated (state III) respiration and 30% decrease in ADP/O ratio, while DNP-uncoupled respiration remained normal, demonstrating the biochemical defect is linked specifically to this mutation and not to nuclear background.","method":"Cytoplast transfer to mtDNA-deficient (rho0) cells (cybrid generation), mitochondrial respiration assays with multiple substrates, ADP/O ratio measurements","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Strong — cybrid reconstitution experiment with rigorous genetic controls (homoplasmic mutant vs. wild-type cybrids), multiple orthogonal biochemical readouts, replicated across multiple clones","pmids":["8078883"],"is_preprint":false},{"year":1999,"finding":"Site-directed mutagenesis of equivalent residues in the E. coli ATP synthase a subunit showed that the L262P mutation (equivalent to human m.9185T>C) caused ~70% loss of ATP synthesis activity, reduced DCCD sensitivity, and lowered proton pumping activity; L207P (equivalent to m.8993T>C) reduced ATP synthesis by ~50% and affected DCCD sensitivity with only marginal effect on proton pumping. This confirmed that MT-ATP6 pathogenic mutations impair the proton-translocation and ATP synthesis functions of subunit a.","method":"Site-directed mutagenesis of E. coli atp6 a subunit, in vitro ATPase activity assays, ATP synthesis assays, proton pumping assays (AMCA quenching)","journal":"FEBS letters","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with mutagenesis, direct enzymatic assays, multiple mutations tested; single lab but multiple orthogonal functional readouts","pmids":["10403398"],"is_preprint":false},{"year":2002,"finding":"Wild-type MT-ATP6 protein can be allotopically expressed from the nucleus: a recoded ATPase 6 gene (universal genetic code) with an appended N-terminal mitochondrial targeting signal and C-terminal FLAG tag was expressed in human cells, the precursor was imported into and processed within mitochondria, incorporated into complex V, and rescued ATP synthesis in cybrids homoplasmic for the m.8993T>G mutation. This is the first demonstration of allotopic expression of an mtDNA-encoded polypeptide in mammalian cells.","method":"Nuclear transfection of recoded MT-ATP6 construct, mitochondrial import/processing assay, FLAG-tag detection, ATP synthesis assay in cybrids, selective medium growth recovery","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — functional rescue in cybrids with multiple readouts (import, processing, complex assembly, ATP synthesis, growth); single lab but multiple orthogonal methods","pmids":["11925565"],"is_preprint":false},{"year":2006,"finding":"Homoplasmic T8993G and T8993C mutations in MT-ATP6 inhibit ATP synthesis (T8993G causes ~60% inhibition in ATP synthesis turnover) and destabilize the F1F0 complex under denaturing conditions, but do not prevent correct assembly or oligomerization of the ATP synthase. The primary pathogenic mechanism is functional inhibition of a correctly assembled enzyme, not disassembly.","method":"Immunoprecipitation, blue-native gel electrophoresis, ATP synthesis turnover assay, oligomycin sensitivity assay, in vitro denaturing conditions","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — multiple orthogonal methods (BN-PAGE, immunoprecipitation, functional enzymatic assays, structural stability assays) in a single rigorous study; two mutant alleles tested","pmids":["17121862"],"is_preprint":false},{"year":2007,"finding":"Both m.8993T>G and m.8993T>C mutations in MT-ATP6 lead to energy deprivation and ROS overproduction in patient lymphocytes, but with different relative contributions: T>G primarily induces energy deficiency, while T>C predominantly favors increased ROS production, indicating different pathogenic mechanisms for two mutations at the same nucleotide affecting Leu-156 of ATPase 6.","method":"Mitochondrial functional assays in patient lymphocytes (ATP synthesis, ROS measurement), comparison of T>G vs. T>C mutation carriers","journal":"Biochimica et biophysica acta","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — two orthogonal measurements (ATP synthesis and ROS) in patient-derived cells; single lab, no cybrid controls","pmids":["17568559"],"is_preprint":false},{"year":2009,"finding":"The mtDNA background modulates bioenergetic defects in NARP/MILS ATP6 mutant cells: cybrids from patients with T8993G, T8993C, or T9176G mutations showed dramatically variable ATP synthesis impairment, and the most severe cases also exhibited defective respiration and disassembly of respiratory chain complexes. Full mtDNA sequencing identified background variants in structural genes causing amino acid changes that destabilize the respiratory chain, demonstrating that mtDNA haplogroup background modifies the biochemical severity of MT-ATP6 mutations.","method":"Cybrid cell lines from five patients, ATP synthesis assay, oxygen consumption measurement, BN-PAGE for respiratory chain complex assembly, full mtDNA sequencing","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — multiple cybrid lines, multiple orthogonal methods (functional assays + structural assembly + sequencing); single lab but rigorous design","pmids":["19875463"],"is_preprint":false},{"year":2004,"finding":"A 2 bp deletion (9205ΔTA) affecting the stop codon of the MT-ATP6 gene and the cleavage site between ATP6 and COX3 mRNAs causes a 10-fold decrease in subunit a content (ATPase 6 protein), 70% decrease in ATP synthesis, and 85% decrease in COX activity. [35S]-methionine labeling showed 9-fold decrease in subunit a biosynthesis. BN-PAGE revealed instability and dissociation of the ATPase complex into subcomplexes capable of hydrolysis but not synthesis, and impaired COX assembly.","method":"35S-methionine metabolic labeling of mitochondrial translation products, BN-PAGE and 2D electrophoresis, ATP synthesis assay, ATPase hydrolysis assay, mitochondrial membrane potential measurement, Northern blot, quantitative RT-PCR","journal":"The Biochemical journal","confidence":"High","confidence_rationale":"Tier 1 / Moderate — multiple orthogonal methods (metabolic labeling, native gels, functional assays, mRNA analysis) in a single rigorous study","pmids":["15265003"],"is_preprint":false},{"year":2012,"finding":"The m.9185T>C mutation in MT-ATP6 causes impaired assembly and reduced activity of the complex V holoenzyme, demonstrated by blue-native gel electrophoresis in patients with axonal Charcot-Marie-Tooth disease (CMT2), establishing that MT-ATP6 mutations can cause isolated axonal neuropathy via disruption of ATP synthase structure and function.","method":"Blue-native gel electrophoresis (BN-PAGE) for complex V structure and activity, restriction endonuclease analysis for mutation load quantification","journal":"Neurology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — BN-PAGE for structural and functional assessment; single lab but combined with genetic quantification","pmids":["22933740"],"is_preprint":false},{"year":2016,"finding":"Stable nuclear co-expression of both ATP8 and ATP6 genes (with mitochondrial targeting sequences) in a cybrid null for both proteins rescued Complex V assembly and function, restoring ATP hydrolysis/synthesis, oxygen consumption, and viability on Krebs cycle substrates. Nuclear expression of ATP8 alone restored viability and ATP synthesis but failed to restore ATP hydrolysis and was insensitive to OXPHOS inhibitors, demonstrating that both MT-ATP6 and MT-ATP8 protein products are required for full Complex V function.","method":"Stable nuclear transfection with allotopic constructs, ATP synthesis/hydrolysis assays, BN-PAGE for complex V assembly, oxygen consumption rate measurement, viability assay on Krebs cycle substrates, inhibitor sensitivity assays","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Moderate — functional rescue with multiple orthogonal assays (assembly, hydrolysis, synthesis, respiration); single lab but rigorous reconstitution design","pmids":["27596602"],"is_preprint":false},{"year":2017,"finding":"A novel frameshift mutation in MT-ATP6 causes severe depletion of ATP6 protein and aberrant translation product accumulation (demonstrated by [35S]-methionine labeling), impairs complex V assembly (accumulation of ATPase subcomplexes on native PAGE), and causes isolated complex V deficiency with preserved ATP8/6 mRNA levels, showing that the frameshift acts post-transcriptionally to reduce ATP6 protein and disrupt complex V assembly.","method":"Metabolic 35S-labeling of mitochondrial translation products, Northern blotting, native PAGE with immunoblotting, enzymatic and oxymetric analysis of mitochondrial respiratory system","journal":"European journal of medical genetics","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — metabolic labeling and native gels provide direct mechanistic evidence; single lab, single patient","pmids":["28412374"],"is_preprint":false},{"year":2018,"finding":"The m.8993T>G variant in MT-ATP6 causes severe defects in mitochondrial cristae structure (morphometric analysis) and impairs oxidative phosphorylation with decreased spare respiratory capacity and a stunted ability to switch to glycolysis upon full OXPHOS inhibition, revealing a defective energy reprogramming mechanism in patient fibroblasts.","method":"Mitochondrial morphometric analysis (live-cell imaging of cristae), live-cell mitochondrial respiratory analysis (Seahorse XF), glycolysis stress assay","journal":"Molecular genetics and metabolism","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — two orthogonal methods (morphometry + respirometry) in patient fibroblasts; single lab, single patient","pmids":["29602698"],"is_preprint":false},{"year":2018,"finding":"Chemically modified mRNAs encoding allotopically expressed MT-ATP6 with optimized mitochondrial targeting sequences functionally rescued mitochondrial function in cells harboring the m.8993T>G mutation, establishing that cytoplasmic translation of MT-ATP6 followed by mitochondrial import can rescue the ATP synthesis defect.","method":"Automated quantitative screening of 31 mitochondrial targeting sequences and 15 3'UTRs, protein localization assay, mitochondrial morphology assay, functional rescue assay in m.8993T>G cybrid cells","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — systematic screening plus functional rescue; single lab, multiple constructs tested","pmids":["29539412"],"is_preprint":false},{"year":2019,"finding":"The pathogenic m.8851T>C mutation (aW109R in subunit a of ATP synthase) prevents proper proton movement within the n-side hydrophilic cleft of the ATP synthase membrane domain. Using yeast equivalent (aW126R), compensatory mutagenesis and analysis of atomic structures showed that the arginine substitution causes electrostatic/steric hindrance that enables aR169 to form a salt bridge with cE59, preventing aR176 from properly interacting with cE59 and blocking proton translocation across the mitochondrial inner membrane.","method":"Yeast Saccharomyces cerevisiae model (equivalent aW126R mutation), site-directed mutagenesis (multiple compensatory mutations at aR169 and surrounding residues), ATP synthase assembly/stability analysis, functional ATP synthase assays, analysis of published atomic structures","journal":"Biochimica et biophysica acta. Bioenergetics","confidence":"High","confidence_rationale":"Tier 1 / Moderate — mutagenesis with functional rescue and structural analysis; multiple compensatory mutations tested, clear mechanistic dissection of proton translocation pathway","pmids":["31181185"],"is_preprint":false},{"year":2016,"finding":"The m.8561C>G mutation in the overlapping region of MT-ATP6/MT-ATP8 causes impaired complex V assembly (additional assembly intermediate and increased free F1 subcomplex by BN-PAGE) and decreased intracellular ATP concentration in patient myoblasts, demonstrating that mutations in the overlapping MT-ATP6/8 region disrupt both subunits and impair ATP synthase biogenesis.","method":"BN-PAGE to detect complex V assembly intermediates, intracellular ATP concentration measurement in patient myoblasts","journal":"Journal of neurology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — two orthogonal methods (BN-PAGE + ATP assay) in patient-derived cells; single lab","pmids":["27502083"],"is_preprint":false},{"year":2022,"finding":"A heteroplasmic truncating mutation m.9154C>T in MT-ATP6 impairs ATP synthase assembly and disrupts mitochondrial cristae morphology. In patient-derived iPSC-derived motor neurons, the truncation causes Notch hyperactivation and impairs motor neuron differentiation beyond the progenitor stage, and at a lower heteroplasmy threshold causes a metabolic shift affecting lactate utilization. Molecular dynamics simulations predicted destabilization of the a/c subunit subcomplex consistent with the truncation.","method":"Patient-specific iPSC generation and motor neuron differentiation, ATP synthase assembly assay, mitochondrial cristae morphology analysis, Notch pathway activity measurement, metabolic flux analysis (lactate utilization), molecular dynamics simulation","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods in disease-relevant cell model; single lab, novel mechanistic link between MT-ATP6/ATP synthase and Notch signaling","pmids":["34635923"],"is_preprint":false},{"year":2022,"finding":"miR-378a negatively regulates mt-ATP6 protein abundance in mitochondria of the diabetic heart; knockout of miR-378a in a T2DM mouse model preserved mt-ATP6 and ATP synthase protein content and activity and preserved cardiac function. The lncRNA Kcnq1ot1 can bind and reduce miR-378a levels, rescuing mt-ATP6 and ATP synthase protein content, establishing a Kcnq1ot1/miR-378a/mt-ATP6 regulatory axis.","method":"miR-378a knockout mouse model (Db/Db T2DM background), lncRNA Kcnq1ot1 overexpression in HL-1 cardiomyocytes, ATP synthase activity assay, Western blot for mt-ATP6 and ATP synthase, cardiac function measurement","journal":"American journal of physiology. Cell physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO mouse model plus cell-based overexpression with functional readouts; single lab, multiple methods","pmids":["35108116"],"is_preprint":false},{"year":2020,"finding":"Truncating MT-ATP6 mutations (m.8782G>A p.Gly86* and m.8618dup p.Thr33Hisfs*32) cause impaired complex V assembly (multiple BN-PAGE bands indicating subcomplexes), reduced basal respiration and ATP synthesis by microscale oxygraphy, and increased reactive oxygen species generation in patient fibroblasts and skeletal muscle. Cybrid studies confirmed pathogenicity of the novel truncating variant.","method":"BN-PAGE of patient fibroblasts and skeletal muscle, microscale oxygraphy (respiration and ATP synthesis), ROS measurement, transmitochondrial cybrid cell lines","journal":"Neurology. Genetics","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — multiple orthogonal methods including cybrid reconstitution, BN-PAGE, and functional respiratory assays; two mutations characterized","pmids":["32042910"],"is_preprint":false}],"current_model":"MT-ATP6 encodes subunit a (ATPase 6) of the mitochondrial F1F0-ATP synthase complex V, where it forms the proton-translocation channel together with the c-ring; pathogenic mutations (most notably m.8993T>G/C, m.9185T>C, m.9176T>C, and truncating variants) impair ATP synthesis and proton pumping by functionally inhibiting the correctly assembled enzyme, destabilizing the complex under stress, or preventing subunit a synthesis/incorporation, with mtDNA background variants in other respiratory chain genes further modulating the severity of the bioenergetic defect, and the protein's abundance is additionally regulated post-transcriptionally by mitochondria-targeted miR-378a."},"narrative":{"mechanistic_narrative":"MT-ATP6 encodes subunit a of the mitochondrial F1F0-ATP synthase (complex V), where it cooperates with the c-ring to form the proton-translocation pathway that couples the inner-membrane proton gradient to ATP synthesis [PMID:8078883, PMID:10403398]. Cybrid reconstitution of the m.8993T>G mutation established that pathogenic substitutions impair H+-translocating ATP synthase function, reducing ADP-stimulated respiration and ATP synthesis turnover without preventing correct assembly or oligomerization of the holoenzyme, so the primary defect is functional inhibition of a properly assembled enzyme that is additionally destabilized under denaturing stress [PMID:8078883, PMID:17121862]. Mutagenesis of equivalent residues in bacterial and yeast subunit a maps this defect to the proton-conduction machinery: pathogenic arginine and proline substitutions disrupt the salt-bridge relay between subunit-a arginines and the c-ring glutamate that normally drives proton movement across the membrane [PMID:10403398, PMID:31181185]. A second class of variants — frameshift, truncating, and stop/cleavage-site mutations — acts post-transcriptionally to deplete subunit a protein and biosynthesis, producing assembly-incompetent ATPase subcomplexes that retain hydrolytic but not synthetic activity [PMID:15265003, PMID:28412374, PMID:32042910]. Allotopic and modified-mRNA expression of recoded MT-ATP6 from the nucleus is imported, processed, incorporated into complex V, and rescues ATP synthesis in m.8993T>G cybrids, with co-expression of MT-ATP8 required for full hydrolysis and respiration [PMID:11925565, PMID:27596602, PMID:29539412]. The downstream consequences of these defects include cristae disruption, ROS overproduction, defective glycolytic reprogramming, and disease ranging from NARP/MILS to isolated axonal Charcot-Marie-Tooth neuropathy, with the mtDNA haplogroup background modulating biochemical severity [PMID:17568559, PMID:19875463, PMID:22933740, PMID:29602698]. Beyond the synthase itself, mitochondria-targeted miR-378a negatively regulates subunit a abundance in the diabetic heart through a Kcnq1ot1/miR-378a axis [PMID:35108116].","teleology":[{"year":1994,"claim":"Established that an MT-ATP6 point mutation, not nuclear background, is the direct cause of defective mitochondrial ATP synthase function, anchoring the gene's bioenergetic role.","evidence":"Cybrid generation of homoplasmic m.8993T>G cells with respiration and ADP/O measurements","pmids":["8078883"],"confidence":"High","gaps":["Did not resolve which step of the catalytic/proton cycle is impaired","Single mutation tested"]},{"year":1999,"claim":"Localized the functional lesion of pathogenic MT-ATP6 variants to the proton-translocation and ATP-synthesis activity of subunit a by reconstructing equivalent mutations in bacterial enzyme.","evidence":"Site-directed mutagenesis of E. coli atp6 a subunit with ATP synthesis, ATPase, DCCD-sensitivity and proton-pumping assays","pmids":["10403398"],"confidence":"High","gaps":["Bacterial surrogate, not human enzyme","Did not address human complex assembly"]},{"year":2004,"claim":"Showed a distinct, post-transcriptional class of MT-ATP6 lesion in which loss of subunit a protein destabilizes the synthase into hydrolysis-only subcomplexes and impairs COX assembly.","evidence":"35S-methionine labeling, BN-PAGE/2D gels, ATP synthesis/hydrolysis, Northern blot of a 9205ΔTA stop/cleavage-site deletion","pmids":["15265003"],"confidence":"High","gaps":["Mechanism of COX co-assembly defect not resolved","Single variant"]},{"year":2006,"claim":"Defined the primary pathogenic mechanism of m.8993 alleles as functional inhibition of a correctly assembled enzyme rather than disassembly, with destabilization only under stress.","evidence":"Immunoprecipitation, BN-PAGE, ATP synthesis turnover and oligomycin sensitivity assays under denaturing conditions","pmids":["17121862"],"confidence":"High","gaps":["Did not separate proton-pumping from catalytic contributions","Stress conditions in vitro"]},{"year":2007,"claim":"Revealed that two mutations at the same nucleotide produce divergent downstream pathology — energy deficiency versus ROS overproduction — indicating allele-specific mechanisms.","evidence":"ATP synthesis and ROS measurements in patient lymphocytes comparing m.8993T>G and T>C","pmids":["17568559"],"confidence":"Medium","gaps":["No cybrid controls to exclude nuclear/background effects","ROS source not mapped to a specific complex"]},{"year":2009,"claim":"Demonstrated that the mtDNA haplogroup background modifies the biochemical severity of MT-ATP6 mutations, explaining clinical variability.","evidence":"Five patient cybrid lines with ATP synthesis, oxygen consumption, BN-PAGE and full mtDNA sequencing","pmids":["19875463"],"confidence":"High","gaps":["Did not establish causal contribution of each individual background variant","Limited number of haplotypes"]},{"year":2016,"claim":"Established that overlapping MT-ATP6/MT-ATP8 region mutations disrupt complex V biogenesis, and that both subunit a and subunit ATP8 products are required for full enzyme function.","evidence":"BN-PAGE of complex V assembly intermediates and ATP assays in patient myoblasts; allotopic co-expression of ATP6 and ATP8 rescue in null cybrids","pmids":["27502083","27596602"],"confidence":"High","gaps":["Stoichiometric/structural role of each subunit in assembly not fully resolved"]},{"year":2012,"claim":"Extended the disease spectrum by showing MT-ATP6 mutations can cause isolated axonal neuropathy through impaired complex V assembly and activity.","evidence":"BN-PAGE for complex V structure/activity and mutation-load quantification in CMT2 patients (m.9185T>C)","pmids":["22933740"],"confidence":"Medium","gaps":["Tissue-specific basis of axonal vulnerability not addressed","Single-lab structural assessment"]},{"year":2018,"claim":"Connected the molecular defect to cellular energy reprogramming, showing m.8993T>G impairs cristae structure and the ability to switch to glycolysis under OXPHOS inhibition.","evidence":"Cristae morphometry, Seahorse respirometry and glycolysis stress assays in patient fibroblasts","pmids":["29602698"],"confidence":"Medium","gaps":["Single patient","Causal link between cristae change and metabolic inflexibility not dissected"]},{"year":2018,"claim":"Demonstrated that nuclear/cytoplasmic delivery of MT-ATP6 (allotopic protein and modified mRNA) can rescue the ATP synthesis defect, providing a therapeutic-mechanism proof of concept.","evidence":"Allotopic recoded MT-ATP6 expression with import/processing/assembly and ATP synthesis rescue; modified-mRNA screening of MTS/3'UTRs with functional rescue in m.8993T>G cybrids","pmids":["11925565","29539412"],"confidence":"High","gaps":["Efficiency and in vivo applicability not established","Long-term complex V stability after import not assessed"]},{"year":2019,"claim":"Resolved at atomic resolution how a pathogenic subunit-a substitution blocks proton translocation by rerouting the arginine/glutamate salt-bridge relay.","evidence":"Yeast aW126R model with compensatory mutagenesis at aR169 and structural analysis (m.8851T>C / aW109R)","pmids":["31181185"],"confidence":"High","gaps":["Generalization to other patient alleles not tested","Yeast surrogate"]},{"year":2022,"claim":"Linked truncating MT-ATP6 mutations to developmental signaling, showing assembly failure and cristae disruption that drive Notch hyperactivation and blocked motor neuron differentiation.","evidence":"Patient iPSC-derived motor neurons with assembly, cristae, Notch activity, metabolic flux assays and molecular dynamics of the a/c subcomplex (m.9154C>T)","pmids":["34635923"],"confidence":"Medium","gaps":["Mechanistic link from energy defect to Notch not biochemically resolved","Single mutation/cell model"]},{"year":2022,"claim":"Identified post-transcriptional control of subunit a abundance via a mitochondria-targeted microRNA, defining a Kcnq1ot1/miR-378a/mt-ATP6 regulatory axis relevant to diabetic cardiomyopathy.","evidence":"miR-378a knockout T2DM mouse and Kcnq1ot1 overexpression in HL-1 cardiomyocytes with ATP synthase activity, Western blot and cardiac function","pmids":["35108116"],"confidence":"Medium","gaps":["Direct miR-378a:mt-ATP6 mRNA interaction within mitochondria not structurally mapped","Human relevance not established"]},{"year":null,"claim":"How tissue-specific phenotypes (neuropathy vs. encephalopathy vs. cardiomyopathy) arise from the same biochemical synthase defect remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unifying model linking heteroplasmy level, downstream signaling, and cell-type vulnerability","Limited in vivo mechanistic data for non-canonical phenotypes"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005215","term_label":"transporter activity","supporting_discovery_ids":[0,1,12]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[3,6,8]}],"localization":[{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[0,2,6,10]}],"pathway":[{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[0,3,6,8]}],"complexes":["F1F0-ATP synthase (complex V)"],"partners":["MT-ATP8"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P00846","full_name":"ATP synthase F(0) complex subunit a","aliases":["F-ATPase protein 6","Proton-conducting channel, ATP synthase F(0) complex subunit a"],"length_aa":226,"mass_kda":24.8,"function":"Subunit a, of the mitochondrial membrane ATP synthase complex (F(1)F(0) ATP synthase or Complex V) that produces ATP from ADP in the presence of a proton gradient across the membrane which is generated by electron transport complexes of the respiratory chain (Probable). ATP synthase complex consist of a soluble F(1) head domain - the catalytic core - and a membrane F(1) domain - the membrane proton channel (PubMed:37244256). These two domains are linked by a central stalk rotating inside the F(1) region and a stationary peripheral stalk (PubMed:37244256). During catalysis, ATP synthesis in the catalytic domain of F(1) is coupled via a rotary mechanism of the central stalk subunits to proton translocation (Probable). With the subunit c (ATP5MC1), forms the proton-conducting channel in the F(0) domain, that contains two crucial half-channels (inlet and outlet) that facilitate proton movement from the mitochondrial intermembrane space (IMS) into the matrix (PubMed:37244256). 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Part A, DNA mapping, sequencing, and analysis","url":"https://pubmed.ncbi.nlm.nih.gov/25693693","citation_count":15,"is_preprint":false},{"pmid":"31730828","id":"PMC_31730828","title":"Zinc finger protein RP-8, the Bombyx mori ortholog of programmed cell death 2, regulates cell proliferation.","date":"2019","source":"Developmental and comparative immunology","url":"https://pubmed.ncbi.nlm.nih.gov/31730828","citation_count":15,"is_preprint":false},{"pmid":"17218459","id":"PMC_17218459","title":"Unusual thermal stability of RNA/[RP-PS]-DNA/RNA triplexes containing a homopurine DNA strand.","date":"2007","source":"Biophysical journal","url":"https://pubmed.ncbi.nlm.nih.gov/17218459","citation_count":15,"is_preprint":false},{"pmid":"35685222","id":"PMC_35685222","title":"MYB308-mediated transcriptional activation of plasma membrane H  -ATPase 6 promotes iron uptake in citrus.","date":"2022","source":"Horticulture research","url":"https://pubmed.ncbi.nlm.nih.gov/35685222","citation_count":15,"is_preprint":false},{"pmid":"34877647","id":"PMC_34877647","title":"Genotype-phenotype analysis of MT-ATP6-associated Leigh syndrome.","date":"2021","source":"Acta neurologica Scandinavica","url":"https://pubmed.ncbi.nlm.nih.gov/34877647","citation_count":14,"is_preprint":false},{"pmid":"33476484","id":"PMC_33476484","title":"Epilepsy in MT-ATP6 - related mils/NARP: correlation of elettroclinical features with heteroplasmy.","date":"2021","source":"Annals of clinical and translational neurology","url":"https://pubmed.ncbi.nlm.nih.gov/33476484","citation_count":14,"is_preprint":false},{"pmid":"18481423","id":"PMC_18481423","title":"[Mutation of MTCYB and MTATP6 is associated with asthenospermia].","date":"2008","source":"Zhonghua nan ke xue = National journal of andrology","url":"https://pubmed.ncbi.nlm.nih.gov/18481423","citation_count":14,"is_preprint":false},{"pmid":"31181185","id":"PMC_31181185","title":"The pathogenic MT-ATP6 m.8851T>C mutation prevents proton movements within the n-side hydrophilic cleft of the membrane domain of ATP synthase.","date":"2019","source":"Biochimica et biophysica acta. Bioenergetics","url":"https://pubmed.ncbi.nlm.nih.gov/31181185","citation_count":14,"is_preprint":false},{"pmid":"26160222","id":"PMC_26160222","title":"LTD, RP, and Motor Learning.","date":"2016","source":"Cerebellum (London, England)","url":"https://pubmed.ncbi.nlm.nih.gov/26160222","citation_count":13,"is_preprint":false},{"pmid":"23096681","id":"PMC_23096681","title":"Isolation and in silico functional analysis of MtATP6, a 6-kDa subunit of mitochondrial F₁F0-ATP synthase, in response to abiotic stress.","date":"2012","source":"Genetics and molecular research : GMR","url":"https://pubmed.ncbi.nlm.nih.gov/23096681","citation_count":13,"is_preprint":false},{"pmid":"36566342","id":"PMC_36566342","title":"Separation of long-stranded RNAs by RP-HPLC using an octadecyl-based column with super-wide pores.","date":"2022","source":"Analytical sciences : the international journal of the Japan Society for Analytical Chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/36566342","citation_count":13,"is_preprint":false},{"pmid":"25548692","id":"PMC_25548692","title":"Motor Neuron Syndrome as a New Phenotypic Manifestation of Mutation 9185T>C in Gene MTATP6.","date":"2014","source":"Case reports in neurological medicine","url":"https://pubmed.ncbi.nlm.nih.gov/25548692","citation_count":12,"is_preprint":false},{"pmid":"36435197","id":"PMC_36435197","title":"Ribosomal protein RPL11 haploinsufficiency causes anemia in mice via activation of the RP-MDM2-p53 pathway.","date":"2022","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/36435197","citation_count":12,"is_preprint":false},{"pmid":"35159298","id":"PMC_35159298","title":"Clinical Heterogeneity in MT-ATP6 Pathogenic Variants: Same Genotype-Different Onset.","date":"2022","source":"Cells","url":"https://pubmed.ncbi.nlm.nih.gov/35159298","citation_count":12,"is_preprint":false},{"pmid":"10447596","id":"PMC_10447596","title":"Nuclear genes from Tx CMS maintainer lines are unable to maintain atp6 RNA editing in any anther cell-type in the sorghum bicolor A3 cytoplasm.","date":"1999","source":"Current genetics","url":"https://pubmed.ncbi.nlm.nih.gov/10447596","citation_count":12,"is_preprint":false},{"pmid":"31500933","id":"PMC_31500933","title":"Early infantile-onset Leigh syndrome complicated with infantile spasms associated with the m.9185 T > C variant in the MT-ATP6 gene: Expanding the clinical spectrum.","date":"2019","source":"Brain & development","url":"https://pubmed.ncbi.nlm.nih.gov/31500933","citation_count":12,"is_preprint":false},{"pmid":"31126091","id":"PMC_31126091","title":"Novel Thienopyrimidine Derivative, RP-010, Induces β-Catenin Fragmentation and Is Efficacious against Prostate Cancer Cells.","date":"2019","source":"Cancers","url":"https://pubmed.ncbi.nlm.nih.gov/31126091","citation_count":12,"is_preprint":false},{"pmid":"10403398","id":"PMC_10403398","title":"Mutation of the mitochrondrially encoded ATPase 6 gene modeled in the ATP synthase of Escherichia coli.","date":"1999","source":"FEBS letters","url":"https://pubmed.ncbi.nlm.nih.gov/10403398","citation_count":12,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":47534,"output_tokens":4837,"usd":0.107578,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":13463,"output_tokens":4093,"usd":0.08482,"stage2_stop_reason":"end_turn"},"total_usd":0.192398,"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\": 1994,\n      \"finding\": \"The mtDNA nt 8993 T→G mutation in the ATP6 gene (encoding ATPase 6 subunit of complex V) directly causes defective mitochondrial H⁺-translocating ATP synthase function: cybrid cells homoplasmic for the mutation showed 24–53% reduction in ADP-stimulated (state III) respiration and 30% decrease in ADP/O ratio, while DNP-uncoupled respiration remained normal, demonstrating the biochemical defect is linked specifically to this mutation and not to nuclear background.\",\n      \"method\": \"Cytoplast transfer to mtDNA-deficient (rho0) cells (cybrid generation), mitochondrial respiration assays with multiple substrates, ADP/O ratio measurements\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — cybrid reconstitution experiment with rigorous genetic controls (homoplasmic mutant vs. wild-type cybrids), multiple orthogonal biochemical readouts, replicated across multiple clones\",\n      \"pmids\": [\"8078883\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Site-directed mutagenesis of equivalent residues in the E. coli ATP synthase a subunit showed that the L262P mutation (equivalent to human m.9185T>C) caused ~70% loss of ATP synthesis activity, reduced DCCD sensitivity, and lowered proton pumping activity; L207P (equivalent to m.8993T>C) reduced ATP synthesis by ~50% and affected DCCD sensitivity with only marginal effect on proton pumping. This confirmed that MT-ATP6 pathogenic mutations impair the proton-translocation and ATP synthesis functions of subunit a.\",\n      \"method\": \"Site-directed mutagenesis of E. coli atp6 a subunit, in vitro ATPase activity assays, ATP synthesis assays, proton pumping assays (AMCA quenching)\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with mutagenesis, direct enzymatic assays, multiple mutations tested; single lab but multiple orthogonal functional readouts\",\n      \"pmids\": [\"10403398\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Wild-type MT-ATP6 protein can be allotopically expressed from the nucleus: a recoded ATPase 6 gene (universal genetic code) with an appended N-terminal mitochondrial targeting signal and C-terminal FLAG tag was expressed in human cells, the precursor was imported into and processed within mitochondria, incorporated into complex V, and rescued ATP synthesis in cybrids homoplasmic for the m.8993T>G mutation. This is the first demonstration of allotopic expression of an mtDNA-encoded polypeptide in mammalian cells.\",\n      \"method\": \"Nuclear transfection of recoded MT-ATP6 construct, mitochondrial import/processing assay, FLAG-tag detection, ATP synthesis assay in cybrids, selective medium growth recovery\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — functional rescue in cybrids with multiple readouts (import, processing, complex assembly, ATP synthesis, growth); single lab but multiple orthogonal methods\",\n      \"pmids\": [\"11925565\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Homoplasmic T8993G and T8993C mutations in MT-ATP6 inhibit ATP synthesis (T8993G causes ~60% inhibition in ATP synthesis turnover) and destabilize the F1F0 complex under denaturing conditions, but do not prevent correct assembly or oligomerization of the ATP synthase. The primary pathogenic mechanism is functional inhibition of a correctly assembled enzyme, not disassembly.\",\n      \"method\": \"Immunoprecipitation, blue-native gel electrophoresis, ATP synthesis turnover assay, oligomycin sensitivity assay, in vitro denaturing conditions\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — multiple orthogonal methods (BN-PAGE, immunoprecipitation, functional enzymatic assays, structural stability assays) in a single rigorous study; two mutant alleles tested\",\n      \"pmids\": [\"17121862\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Both m.8993T>G and m.8993T>C mutations in MT-ATP6 lead to energy deprivation and ROS overproduction in patient lymphocytes, but with different relative contributions: T>G primarily induces energy deficiency, while T>C predominantly favors increased ROS production, indicating different pathogenic mechanisms for two mutations at the same nucleotide affecting Leu-156 of ATPase 6.\",\n      \"method\": \"Mitochondrial functional assays in patient lymphocytes (ATP synthesis, ROS measurement), comparison of T>G vs. T>C mutation carriers\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — two orthogonal measurements (ATP synthesis and ROS) in patient-derived cells; single lab, no cybrid controls\",\n      \"pmids\": [\"17568559\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"The mtDNA background modulates bioenergetic defects in NARP/MILS ATP6 mutant cells: cybrids from patients with T8993G, T8993C, or T9176G mutations showed dramatically variable ATP synthesis impairment, and the most severe cases also exhibited defective respiration and disassembly of respiratory chain complexes. Full mtDNA sequencing identified background variants in structural genes causing amino acid changes that destabilize the respiratory chain, demonstrating that mtDNA haplogroup background modifies the biochemical severity of MT-ATP6 mutations.\",\n      \"method\": \"Cybrid cell lines from five patients, ATP synthesis assay, oxygen consumption measurement, BN-PAGE for respiratory chain complex assembly, full mtDNA sequencing\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — multiple cybrid lines, multiple orthogonal methods (functional assays + structural assembly + sequencing); single lab but rigorous design\",\n      \"pmids\": [\"19875463\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"A 2 bp deletion (9205ΔTA) affecting the stop codon of the MT-ATP6 gene and the cleavage site between ATP6 and COX3 mRNAs causes a 10-fold decrease in subunit a content (ATPase 6 protein), 70% decrease in ATP synthesis, and 85% decrease in COX activity. [35S]-methionine labeling showed 9-fold decrease in subunit a biosynthesis. BN-PAGE revealed instability and dissociation of the ATPase complex into subcomplexes capable of hydrolysis but not synthesis, and impaired COX assembly.\",\n      \"method\": \"35S-methionine metabolic labeling of mitochondrial translation products, BN-PAGE and 2D electrophoresis, ATP synthesis assay, ATPase hydrolysis assay, mitochondrial membrane potential measurement, Northern blot, quantitative RT-PCR\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — multiple orthogonal methods (metabolic labeling, native gels, functional assays, mRNA analysis) in a single rigorous study\",\n      \"pmids\": [\"15265003\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"The m.9185T>C mutation in MT-ATP6 causes impaired assembly and reduced activity of the complex V holoenzyme, demonstrated by blue-native gel electrophoresis in patients with axonal Charcot-Marie-Tooth disease (CMT2), establishing that MT-ATP6 mutations can cause isolated axonal neuropathy via disruption of ATP synthase structure and function.\",\n      \"method\": \"Blue-native gel electrophoresis (BN-PAGE) for complex V structure and activity, restriction endonuclease analysis for mutation load quantification\",\n      \"journal\": \"Neurology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — BN-PAGE for structural and functional assessment; single lab but combined with genetic quantification\",\n      \"pmids\": [\"22933740\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Stable nuclear co-expression of both ATP8 and ATP6 genes (with mitochondrial targeting sequences) in a cybrid null for both proteins rescued Complex V assembly and function, restoring ATP hydrolysis/synthesis, oxygen consumption, and viability on Krebs cycle substrates. Nuclear expression of ATP8 alone restored viability and ATP synthesis but failed to restore ATP hydrolysis and was insensitive to OXPHOS inhibitors, demonstrating that both MT-ATP6 and MT-ATP8 protein products are required for full Complex V function.\",\n      \"method\": \"Stable nuclear transfection with allotopic constructs, ATP synthesis/hydrolysis assays, BN-PAGE for complex V assembly, oxygen consumption rate measurement, viability assay on Krebs cycle substrates, inhibitor sensitivity assays\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — functional rescue with multiple orthogonal assays (assembly, hydrolysis, synthesis, respiration); single lab but rigorous reconstitution design\",\n      \"pmids\": [\"27596602\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"A novel frameshift mutation in MT-ATP6 causes severe depletion of ATP6 protein and aberrant translation product accumulation (demonstrated by [35S]-methionine labeling), impairs complex V assembly (accumulation of ATPase subcomplexes on native PAGE), and causes isolated complex V deficiency with preserved ATP8/6 mRNA levels, showing that the frameshift acts post-transcriptionally to reduce ATP6 protein and disrupt complex V assembly.\",\n      \"method\": \"Metabolic 35S-labeling of mitochondrial translation products, Northern blotting, native PAGE with immunoblotting, enzymatic and oxymetric analysis of mitochondrial respiratory system\",\n      \"journal\": \"European journal of medical genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — metabolic labeling and native gels provide direct mechanistic evidence; single lab, single patient\",\n      \"pmids\": [\"28412374\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"The m.8993T>G variant in MT-ATP6 causes severe defects in mitochondrial cristae structure (morphometric analysis) and impairs oxidative phosphorylation with decreased spare respiratory capacity and a stunted ability to switch to glycolysis upon full OXPHOS inhibition, revealing a defective energy reprogramming mechanism in patient fibroblasts.\",\n      \"method\": \"Mitochondrial morphometric analysis (live-cell imaging of cristae), live-cell mitochondrial respiratory analysis (Seahorse XF), glycolysis stress assay\",\n      \"journal\": \"Molecular genetics and metabolism\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — two orthogonal methods (morphometry + respirometry) in patient fibroblasts; single lab, single patient\",\n      \"pmids\": [\"29602698\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Chemically modified mRNAs encoding allotopically expressed MT-ATP6 with optimized mitochondrial targeting sequences functionally rescued mitochondrial function in cells harboring the m.8993T>G mutation, establishing that cytoplasmic translation of MT-ATP6 followed by mitochondrial import can rescue the ATP synthesis defect.\",\n      \"method\": \"Automated quantitative screening of 31 mitochondrial targeting sequences and 15 3'UTRs, protein localization assay, mitochondrial morphology assay, functional rescue assay in m.8993T>G cybrid cells\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — systematic screening plus functional rescue; single lab, multiple constructs tested\",\n      \"pmids\": [\"29539412\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"The pathogenic m.8851T>C mutation (aW109R in subunit a of ATP synthase) prevents proper proton movement within the n-side hydrophilic cleft of the ATP synthase membrane domain. Using yeast equivalent (aW126R), compensatory mutagenesis and analysis of atomic structures showed that the arginine substitution causes electrostatic/steric hindrance that enables aR169 to form a salt bridge with cE59, preventing aR176 from properly interacting with cE59 and blocking proton translocation across the mitochondrial inner membrane.\",\n      \"method\": \"Yeast Saccharomyces cerevisiae model (equivalent aW126R mutation), site-directed mutagenesis (multiple compensatory mutations at aR169 and surrounding residues), ATP synthase assembly/stability analysis, functional ATP synthase assays, analysis of published atomic structures\",\n      \"journal\": \"Biochimica et biophysica acta. Bioenergetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — mutagenesis with functional rescue and structural analysis; multiple compensatory mutations tested, clear mechanistic dissection of proton translocation pathway\",\n      \"pmids\": [\"31181185\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"The m.8561C>G mutation in the overlapping region of MT-ATP6/MT-ATP8 causes impaired complex V assembly (additional assembly intermediate and increased free F1 subcomplex by BN-PAGE) and decreased intracellular ATP concentration in patient myoblasts, demonstrating that mutations in the overlapping MT-ATP6/8 region disrupt both subunits and impair ATP synthase biogenesis.\",\n      \"method\": \"BN-PAGE to detect complex V assembly intermediates, intracellular ATP concentration measurement in patient myoblasts\",\n      \"journal\": \"Journal of neurology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — two orthogonal methods (BN-PAGE + ATP assay) in patient-derived cells; single lab\",\n      \"pmids\": [\"27502083\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"A heteroplasmic truncating mutation m.9154C>T in MT-ATP6 impairs ATP synthase assembly and disrupts mitochondrial cristae morphology. In patient-derived iPSC-derived motor neurons, the truncation causes Notch hyperactivation and impairs motor neuron differentiation beyond the progenitor stage, and at a lower heteroplasmy threshold causes a metabolic shift affecting lactate utilization. Molecular dynamics simulations predicted destabilization of the a/c subunit subcomplex consistent with the truncation.\",\n      \"method\": \"Patient-specific iPSC generation and motor neuron differentiation, ATP synthase assembly assay, mitochondrial cristae morphology analysis, Notch pathway activity measurement, metabolic flux analysis (lactate utilization), molecular dynamics simulation\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods in disease-relevant cell model; single lab, novel mechanistic link between MT-ATP6/ATP synthase and Notch signaling\",\n      \"pmids\": [\"34635923\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"miR-378a negatively regulates mt-ATP6 protein abundance in mitochondria of the diabetic heart; knockout of miR-378a in a T2DM mouse model preserved mt-ATP6 and ATP synthase protein content and activity and preserved cardiac function. The lncRNA Kcnq1ot1 can bind and reduce miR-378a levels, rescuing mt-ATP6 and ATP synthase protein content, establishing a Kcnq1ot1/miR-378a/mt-ATP6 regulatory axis.\",\n      \"method\": \"miR-378a knockout mouse model (Db/Db T2DM background), lncRNA Kcnq1ot1 overexpression in HL-1 cardiomyocytes, ATP synthase activity assay, Western blot for mt-ATP6 and ATP synthase, cardiac function measurement\",\n      \"journal\": \"American journal of physiology. Cell physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO mouse model plus cell-based overexpression with functional readouts; single lab, multiple methods\",\n      \"pmids\": [\"35108116\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Truncating MT-ATP6 mutations (m.8782G>A p.Gly86* and m.8618dup p.Thr33Hisfs*32) cause impaired complex V assembly (multiple BN-PAGE bands indicating subcomplexes), reduced basal respiration and ATP synthesis by microscale oxygraphy, and increased reactive oxygen species generation in patient fibroblasts and skeletal muscle. Cybrid studies confirmed pathogenicity of the novel truncating variant.\",\n      \"method\": \"BN-PAGE of patient fibroblasts and skeletal muscle, microscale oxygraphy (respiration and ATP synthesis), ROS measurement, transmitochondrial cybrid cell lines\",\n      \"journal\": \"Neurology. Genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — multiple orthogonal methods including cybrid reconstitution, BN-PAGE, and functional respiratory assays; two mutations characterized\",\n      \"pmids\": [\"32042910\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"MT-ATP6 encodes subunit a (ATPase 6) of the mitochondrial F1F0-ATP synthase complex V, where it forms the proton-translocation channel together with the c-ring; pathogenic mutations (most notably m.8993T>G/C, m.9185T>C, m.9176T>C, and truncating variants) impair ATP synthesis and proton pumping by functionally inhibiting the correctly assembled enzyme, destabilizing the complex under stress, or preventing subunit a synthesis/incorporation, with mtDNA background variants in other respiratory chain genes further modulating the severity of the bioenergetic defect, and the protein's abundance is additionally regulated post-transcriptionally by mitochondria-targeted miR-378a.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"MT-ATP6 encodes subunit a of the mitochondrial F1F0-ATP synthase (complex V), where it cooperates with the c-ring to form the proton-translocation pathway that couples the inner-membrane proton gradient to ATP synthesis [#0, #1]. Cybrid reconstitution of the m.8993T>G mutation established that pathogenic substitutions impair H+-translocating ATP synthase function, reducing ADP-stimulated respiration and ATP synthesis turnover without preventing correct assembly or oligomerization of the holoenzyme, so the primary defect is functional inhibition of a properly assembled enzyme that is additionally destabilized under denaturing stress [#0, #3]. Mutagenesis of equivalent residues in bacterial and yeast subunit a maps this defect to the proton-conduction machinery: pathogenic arginine and proline substitutions disrupt the salt-bridge relay between subunit-a arginines and the c-ring glutamate that normally drives proton movement across the membrane [#1, #12]. A second class of variants — frameshift, truncating, and stop/cleavage-site mutations — acts post-transcriptionally to deplete subunit a protein and biosynthesis, producing assembly-incompetent ATPase subcomplexes that retain hydrolytic but not synthetic activity [#6, #9, #16]. Allotopic and modified-mRNA expression of recoded MT-ATP6 from the nucleus is imported, processed, incorporated into complex V, and rescues ATP synthesis in m.8993T>G cybrids, with co-expression of MT-ATP8 required for full hydrolysis and respiration [#2, #8, #11]. The downstream consequences of these defects include cristae disruption, ROS overproduction, defective glycolytic reprogramming, and disease ranging from NARP/MILS to isolated axonal Charcot-Marie-Tooth neuropathy, with the mtDNA haplogroup background modulating biochemical severity [#4, #5, #7, #10]. Beyond the synthase itself, mitochondria-targeted miR-378a negatively regulates subunit a abundance in the diabetic heart through a Kcnq1ot1/miR-378a axis [#15].\",\n  \"teleology\": [\n    {\n      \"year\": 1994,\n      \"claim\": \"Established that an MT-ATP6 point mutation, not nuclear background, is the direct cause of defective mitochondrial ATP synthase function, anchoring the gene's bioenergetic role.\",\n      \"evidence\": \"Cybrid generation of homoplasmic m.8993T>G cells with respiration and ADP/O measurements\",\n      \"pmids\": [\"8078883\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve which step of the catalytic/proton cycle is impaired\", \"Single mutation tested\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Localized the functional lesion of pathogenic MT-ATP6 variants to the proton-translocation and ATP-synthesis activity of subunit a by reconstructing equivalent mutations in bacterial enzyme.\",\n      \"evidence\": \"Site-directed mutagenesis of E. coli atp6 a subunit with ATP synthesis, ATPase, DCCD-sensitivity and proton-pumping assays\",\n      \"pmids\": [\"10403398\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Bacterial surrogate, not human enzyme\", \"Did not address human complex assembly\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Showed a distinct, post-transcriptional class of MT-ATP6 lesion in which loss of subunit a protein destabilizes the synthase into hydrolysis-only subcomplexes and impairs COX assembly.\",\n      \"evidence\": \"35S-methionine labeling, BN-PAGE/2D gels, ATP synthesis/hydrolysis, Northern blot of a 9205ΔTA stop/cleavage-site deletion\",\n      \"pmids\": [\"15265003\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of COX co-assembly defect not resolved\", \"Single variant\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Defined the primary pathogenic mechanism of m.8993 alleles as functional inhibition of a correctly assembled enzyme rather than disassembly, with destabilization only under stress.\",\n      \"evidence\": \"Immunoprecipitation, BN-PAGE, ATP synthesis turnover and oligomycin sensitivity assays under denaturing conditions\",\n      \"pmids\": [\"17121862\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not separate proton-pumping from catalytic contributions\", \"Stress conditions in vitro\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Revealed that two mutations at the same nucleotide produce divergent downstream pathology — energy deficiency versus ROS overproduction — indicating allele-specific mechanisms.\",\n      \"evidence\": \"ATP synthesis and ROS measurements in patient lymphocytes comparing m.8993T>G and T>C\",\n      \"pmids\": [\"17568559\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No cybrid controls to exclude nuclear/background effects\", \"ROS source not mapped to a specific complex\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Demonstrated that the mtDNA haplogroup background modifies the biochemical severity of MT-ATP6 mutations, explaining clinical variability.\",\n      \"evidence\": \"Five patient cybrid lines with ATP synthesis, oxygen consumption, BN-PAGE and full mtDNA sequencing\",\n      \"pmids\": [\"19875463\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not establish causal contribution of each individual background variant\", \"Limited number of haplotypes\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Established that overlapping MT-ATP6/MT-ATP8 region mutations disrupt complex V biogenesis, and that both subunit a and subunit ATP8 products are required for full enzyme function.\",\n      \"evidence\": \"BN-PAGE of complex V assembly intermediates and ATP assays in patient myoblasts; allotopic co-expression of ATP6 and ATP8 rescue in null cybrids\",\n      \"pmids\": [\"27502083\", \"27596602\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometric/structural role of each subunit in assembly not fully resolved\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Extended the disease spectrum by showing MT-ATP6 mutations can cause isolated axonal neuropathy through impaired complex V assembly and activity.\",\n      \"evidence\": \"BN-PAGE for complex V structure/activity and mutation-load quantification in CMT2 patients (m.9185T>C)\",\n      \"pmids\": [\"22933740\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Tissue-specific basis of axonal vulnerability not addressed\", \"Single-lab structural assessment\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Connected the molecular defect to cellular energy reprogramming, showing m.8993T>G impairs cristae structure and the ability to switch to glycolysis under OXPHOS inhibition.\",\n      \"evidence\": \"Cristae morphometry, Seahorse respirometry and glycolysis stress assays in patient fibroblasts\",\n      \"pmids\": [\"29602698\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single patient\", \"Causal link between cristae change and metabolic inflexibility not dissected\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Demonstrated that nuclear/cytoplasmic delivery of MT-ATP6 (allotopic protein and modified mRNA) can rescue the ATP synthesis defect, providing a therapeutic-mechanism proof of concept.\",\n      \"evidence\": \"Allotopic recoded MT-ATP6 expression with import/processing/assembly and ATP synthesis rescue; modified-mRNA screening of MTS/3'UTRs with functional rescue in m.8993T>G cybrids\",\n      \"pmids\": [\"11925565\", \"29539412\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Efficiency and in vivo applicability not established\", \"Long-term complex V stability after import not assessed\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Resolved at atomic resolution how a pathogenic subunit-a substitution blocks proton translocation by rerouting the arginine/glutamate salt-bridge relay.\",\n      \"evidence\": \"Yeast aW126R model with compensatory mutagenesis at aR169 and structural analysis (m.8851T>C / aW109R)\",\n      \"pmids\": [\"31181185\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Generalization to other patient alleles not tested\", \"Yeast surrogate\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Linked truncating MT-ATP6 mutations to developmental signaling, showing assembly failure and cristae disruption that drive Notch hyperactivation and blocked motor neuron differentiation.\",\n      \"evidence\": \"Patient iPSC-derived motor neurons with assembly, cristae, Notch activity, metabolic flux assays and molecular dynamics of the a/c subcomplex (m.9154C>T)\",\n      \"pmids\": [\"34635923\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanistic link from energy defect to Notch not biochemically resolved\", \"Single mutation/cell model\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Identified post-transcriptional control of subunit a abundance via a mitochondria-targeted microRNA, defining a Kcnq1ot1/miR-378a/mt-ATP6 regulatory axis relevant to diabetic cardiomyopathy.\",\n      \"evidence\": \"miR-378a knockout T2DM mouse and Kcnq1ot1 overexpression in HL-1 cardiomyocytes with ATP synthase activity, Western blot and cardiac function\",\n      \"pmids\": [\"35108116\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct miR-378a:mt-ATP6 mRNA interaction within mitochondria not structurally mapped\", \"Human relevance not established\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How tissue-specific phenotypes (neuropathy vs. encephalopathy vs. cardiomyopathy) arise from the same biochemical synthase defect remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unifying model linking heteroplasmy level, downstream signaling, and cell-type vulnerability\", \"Limited in vivo mechanistic data for non-canonical phenotypes\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0015078\", \"supporting_discovery_ids\": []},\n      {\"term_id\": \"GO:0005215\", \"supporting_discovery_ids\": [0, 1, 12]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [3, 6, 8]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [0, 2, 6, 10]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [0, 3, 6, 8]}\n    ],\n    \"complexes\": [\"F1F0-ATP synthase (complex V)\"],\n    \"partners\": [\"MT-ATP8\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}