{"gene":"MT-CO1","run_date":"2026-06-10T02:59:51","timeline":{"discoveries":[{"year":2012,"finding":"A heteroplasmic mutation in MT-CO1 (derived from a prostate cancer patient) simultaneously decreased cytochrome oxidation activity, increased reactive oxygen species (ROS), and increased reactive nitrogen species in functional cellular assays, suggesting the mutation impairs complex IV electron transfer and promotes oxidative/nitrosative stress.","method":"Functional cellular assays measuring cytochrome oxidase activity, ROS levels, and reactive nitrogen in cells harboring the patient-derived MT-CO1 mutation","journal":"BioMed research international","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — direct functional assays with patient-derived mutation in cellular system, single lab, single study with multiple readouts but no reconstitution or structural validation","pmids":["23509693"],"is_preprint":false},{"year":2008,"finding":"A novel missense mutation m.6955G>A in MT-CO1 was identified as pathogenic, causing a mitochondrial energy metabolism disorder (moderate mental retardation and mild exercise intolerance), establishing that missense mutations in MT-CO1 can produce a clinically distinct phenotype beyond myopathy.","method":"Clinical phenotyping, mtDNA sequencing, biochemical analysis of mitochondrial respiratory chain","journal":"Human mutation","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single patient case with sequencing and clinical correlation, no in vitro reconstitution or mechanistic dissection of the mutation's biochemical effect","pmids":["18484665"],"is_preprint":false},{"year":2014,"finding":"A novel heteroplasmic frameshift mutation (m.7402delC) in MTCO1 causes premature termination of the MT-CO1 polypeptide, resulting in cytochrome c oxidase (complex IV) deficiency demonstrated by COX-negative fibers on muscle biopsy and decreased complex IV activity in homogenate; single fiber PCR showed co-segregation of high mutant load with COX-negative fibers.","method":"Next-generation sequencing of mtDNA, muscle biopsy histochemistry (COX staining), spectrophotometric complex IV activity assay, single fiber PCR","journal":"Mitochondrion","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (sequencing, histochemistry, enzymatic assay, single-fiber PCR) in a single study establishing direct link between MT-CO1 truncation and COX deficiency","pmids":["24956508"],"is_preprint":false},{"year":2018,"finding":"The MT-CO1 V83I polymorphism (m.6150G>A) disrupts binding of amyloid beta peptide (Aβ) to the V83 region of MT-CO1, as demonstrated by ELISA. A yeast two-hybrid screen further identified UBQLN1 (a neuroprotective protein) as an interactor of the V83 region of MT-CO1, an interaction also disrupted by V83I.","method":"Yeast two-hybrid (Y2H) cDNA library screen using V83 region of CO1 as bait; ELISA quantification of Aβ–CO1 protein-protein interaction with wild-type vs. V83I variant","journal":"Investigative ophthalmology & visual science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — two orthogonal binding assays (Y2H and ELISA) in single lab identifying novel interaction partners and demonstrating disruption by variant","pmids":["29610859"],"is_preprint":false},{"year":2019,"finding":"Ectopic over-expression of codon-optimized wild-type or mutant MT-CO1 in mammalian cells promoted anchorage-dependent and -independent proliferation, induced a cancer metabolic phenotype (high glucose uptake and lactate release), generated elevated ROS, differentially regulated apoptosis and DNA damage pathway genes, and down-regulated DNMT3A and DNMT3B, leading to altered CpG island methylation at promoters of pro-cancerous genes. MT-CO1 protein localized to mitochondria but showed high aggregation under denaturing conditions.","method":"Codon optimization and ectopic expression of MT-CO1 in transfected cells; mitochondrial localization by fractionation/imaging; proliferation assays (anchorage-dependent and -independent); metabolic assays (glucose uptake, lactate); ROS measurement; gene expression profiling; DNA methylation analysis","journal":"Mitochondrion","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal functional readouts in a single lab using a novel codon-optimized expression system, but no structural validation or independent replication","pmids":["31299394"],"is_preprint":false},{"year":2018,"finding":"The mitochondrial T6459C point mutation in MT-CO1 (affecting the MT-CO1 coding sequence) was associated with increased cellular ROS levels, increased apoptosis, decreased mitochondrial membrane potential, and decreased ATP concentrations both at baseline and after LPS stimulation, establishing a functional link between this MT-CO1 variant and mitochondrial dysfunction relevant to sepsis susceptibility.","method":"Family pedigree analysis; cellular ROS measurement, mitochondrial membrane potential assay, apoptosis assay, ATP quantification in peripheral blood cells from mutation carriers vs. non-carriers; LPS stimulation experiment","journal":"Journal of cellular and molecular medicine","confidence":"Low","confidence_rationale":"Tier 3 / Weak — cellular functional assays but conducted in primary cells from a single pedigree, small sample sizes, no biochemical reconstitution of the mutation's effect on complex IV","pmids":["30207067"],"is_preprint":false},{"year":2019,"finding":"A novel stop codon mutation m.6579G>A (p.Gly226X) in MT-CO1 causes premature truncation of the MT-CO1 polypeptide and is associated with COX-deficient fibers in muscle, establishing that MT-CO1 truncating mutations can present as adult-onset Leigh syndrome.","method":"Whole mitochondrial genome sequencing; muscle biopsy with COX histochemistry showing COX-deficient fibers; clinical phenotyping","journal":"Mitochondrion","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single patient case with sequencing and histochemistry, no direct biochemical measurement of complex IV activity or mechanistic dissection beyond mutation identification","pmids":["30743023"],"is_preprint":false},{"year":2021,"finding":"In HCC cells, photothermal treatment mediated by a nanocapsule inhibited proliferation, induced apoptosis, and decreased cell motility; these effects were associated with inhibition of the RAS/MAPK/MT-CO1 signaling pathway, placing MT-CO1 downstream of RAS/MAPK in a pro-survival/proliferation axis in hepatocellular carcinoma.","method":"In vitro HCC cell treatment with photothermal nanocapsule (PPCu); proliferation, apoptosis, and motility assays; pathway analysis implicating RAS/MAPK/MT-CO1","journal":"Nano convergence","confidence":"Low","confidence_rationale":"Tier 3 / Weak — pathway placement inferred from cell-based assays with a complex intervention (photothermal nanoparticle), indirect evidence for MT-CO1's specific role, single lab, no genetic epistasis or direct biochemical validation of pathway order","pmids":["34606010"],"is_preprint":false}],"current_model":"MT-CO1 encodes the catalytic core subunit I of mitochondrial complex IV (cytochrome c oxidase); pathogenic mutations (missense, frameshift, or stop codon) in MT-CO1 impair complex IV electron transfer activity, reduce mitochondrial membrane potential and ATP production, elevate reactive oxygen species, and cause COX-deficient fibers in muscle, while the protein's V83 region mediates interactions with amyloid beta peptide and the neuroprotective protein UBQLN1, and over-expression of MT-CO1 can drive a pro-cancerous metabolic phenotype associated with altered ROS, epigenetic reprogramming, and activation of a RAS/MAPK/MT-CO1 pro-survival axis."},"narrative":{"mechanistic_narrative":"MT-CO1 encodes the catalytic core subunit of mitochondrial cytochrome c oxidase (complex IV), and mutations across its coding sequence impair complex IV electron transfer with downstream consequences for mitochondrial bioenergetics and redox state [PMID:23509693]. Truncating mutations—both a heteroplasmic frameshift (m.7402delC) and a stop codon (m.6579G>A, p.Gly226X)—prematurely terminate the polypeptide and produce COX-negative muscle fibers with reduced complex IV activity, with single-fiber analysis showing co-segregation of high mutant load with COX deficiency [PMID:24956508, PMID:30743023]. Missense and point mutations similarly compromise function, decreasing cytochrome oxidase activity, lowering mitochondrial membrane potential and ATP, and elevating reactive oxygen and nitrogen species [PMID:23509693, PMID:30207067]. Beyond its catalytic role, the V83 region of MT-CO1 mediates protein–protein interactions with amyloid beta peptide and the neuroprotective protein UBQLN1, both of which are disrupted by the V83I (m.6150G>A) polymorphism [PMID:29610859]. Ectopic over-expression of MT-CO1 drives a pro-cancerous metabolic phenotype—increased glucose uptake and lactate release, elevated ROS, and down-regulation of DNMT3A/DNMT3B with altered promoter CpG methylation—and MT-CO1 has been placed downstream of a RAS/MAPK pro-survival axis in hepatocellular carcinoma cells [PMID:31299394, PMID:34606010].","teleology":[{"year":2008,"claim":"Established that MT-CO1 missense mutations can cause clinically distinct mitochondrial energy disorders beyond classical myopathy, broadening the phenotypic spectrum attributable to this subunit.","evidence":"Clinical phenotyping, mtDNA sequencing, and respiratory chain biochemistry in a single patient carrying m.6955G>A","pmids":["18484665"],"confidence":"Low","gaps":["Single patient case without in vitro reconstitution","No mechanistic dissection of the missense mutation's effect on complex IV assembly or activity"]},{"year":2012,"claim":"Linked a patient-derived MT-CO1 mutation directly to impaired electron transfer and oxidative/nitrosative stress, connecting the subunit to redox dysregulation in cancer.","evidence":"Functional cellular assays of cytochrome oxidase activity, ROS, and reactive nitrogen in cells harboring a prostate-cancer-derived MT-CO1 mutation","pmids":["23509693"],"confidence":"Medium","gaps":["No structural or reconstitution validation","Single lab, single study"]},{"year":2014,"claim":"Demonstrated that a truncating frameshift mutation causally produces complex IV deficiency, establishing a direct genotype–biochemical–histological chain for MT-CO1 loss of function.","evidence":"NGS of mtDNA, COX histochemistry, spectrophotometric complex IV assay, and single-fiber PCR showing co-segregation of mutant load with COX-negative fibers","pmids":["24956508"],"confidence":"Medium","gaps":["No reconstitution of the truncated protein's effect on assembly","Single pedigree"]},{"year":2018,"claim":"Identified a non-catalytic interaction surface (V83 region) of MT-CO1 that binds amyloid beta and UBQLN1, and showed a natural polymorphism abolishes these interactions—pointing to a role beyond electron transfer.","evidence":"Yeast two-hybrid screen and ELISA comparing wild-type versus V83I binding","pmids":["29610859"],"confidence":"Medium","gaps":["Interactions not validated in a cellular or mitochondrial context","Functional consequence of UBQLN1/Aβ binding to MT-CO1 unresolved"]},{"year":2018,"claim":"Tied a specific point mutation to the integrated mitochondrial dysfunction phenotype (raised ROS, depolarization, reduced ATP, increased apoptosis), connecting MT-CO1 variation to sepsis susceptibility.","evidence":"Family pedigree analysis with ROS, membrane potential, apoptosis, and ATP assays in carrier peripheral blood cells, with and without LPS","pmids":["30207067"],"confidence":"Low","gaps":["Primary cells from a single small pedigree","No biochemical reconstitution of the mutation's effect on complex IV"]},{"year":2019,"claim":"Showed that MT-CO1 over-expression is not merely a passenger but can actively impose a pro-cancerous metabolic and epigenetic state, implicating the subunit as a driver of malignant reprogramming.","evidence":"Codon-optimized ectopic MT-CO1 expression with proliferation, metabolic, ROS, gene expression, and DNA methylation profiling","pmids":["31299394"],"confidence":"Medium","gaps":["No structural validation; protein aggregated under denaturing conditions","No independent replication of the epigenetic effects"]},{"year":2019,"claim":"Confirmed that truncating MT-CO1 mutations can present as adult-onset Leigh syndrome, extending the clinical reach of subunit loss of function.","evidence":"Whole mitochondrial genome sequencing and COX histochemistry showing COX-deficient fibers in a patient with m.6579G>A (p.Gly226X)","pmids":["30743023"],"confidence":"Low","gaps":["Single patient case","No direct complex IV activity measurement"]},{"year":2021,"claim":"Placed MT-CO1 downstream of RAS/MAPK in a pro-survival/proliferation axis in hepatocellular carcinoma, suggesting it integrates oncogenic signaling with mitochondrial output.","evidence":"In vitro HCC photothermal nanocapsule treatment with proliferation, apoptosis, and motility assays implicating RAS/MAPK/MT-CO1","pmids":["34606010"],"confidence":"Low","gaps":["Pathway order inferred without genetic epistasis","Complex intervention provides only indirect evidence for MT-CO1's specific role"]},{"year":null,"claim":"How MT-CO1's non-catalytic interactions (Aβ, UBQLN1) and its over-expression-driven oncogenic phenotype mechanistically connect to its core role in complex IV electron transfer remains unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No structural model linking V83-region binding to catalytic function","Mechanism by which over-expressed MT-CO1 down-regulates DNMTs is unknown","RAS/MAPK/MT-CO1 axis lacks direct biochemical validation"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016491","term_label":"oxidoreductase activity","supporting_discovery_ids":[0,2]}],"localization":[{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[4]}],"pathway":[{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[0,4]}],"complexes":["cytochrome c oxidase (complex IV)"],"partners":["APP","UBQLN1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P00395","full_name":"Cytochrome c oxidase subunit 1","aliases":["Cytochrome c oxidase polypeptide I"],"length_aa":513,"mass_kda":57.0,"function":"Component of the cytochrome c oxidase, the last enzyme in the mitochondrial electron transport chain which drives oxidative phosphorylation. The respiratory chain contains 3 multisubunit complexes succinate dehydrogenase (complex II, CII), ubiquinol-cytochrome c oxidoreductase (cytochrome b-c1 complex, complex III, CIII) and cytochrome c oxidase (complex IV, CIV), that cooperate to transfer electrons derived from NADH and succinate to molecular oxygen, creating an electrochemical gradient over the inner membrane that drives transmembrane transport and the ATP synthase. Cytochrome c oxidase is the component of the respiratory chain that catalyzes the reduction of oxygen to water. Electrons originating from reduced cytochrome c in the intermembrane space (IMS) are transferred via the dinuclear copper A center (CU(A)) of subunit 2 and heme A of subunit 1 to the active site in subunit 1, a binuclear center (BNC) formed by heme A3 and copper B (CU(B)). The BNC reduces molecular oxygen to 2 water molecules using 4 electrons from cytochrome c in the IMS and 4 protons from the mitochondrial matrix","subcellular_location":"Mitochondrion inner membrane","url":"https://www.uniprot.org/uniprotkb/P00395/entry"},"depmap":{"release":"DepMap","has_data":false,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/MT-CO1"},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/MT-CO1","total_profiled":1310},"omim":[{"mim_id":"621431","title":"MITOCHONDRIAL COMPLEX IV DEFICIENCY, NUCLEAR TYPE 24; MC4DN24","url":"https://www.omim.org/entry/621431"},{"mim_id":"614272","title":"FAST KINASE DOMAINS 5; FASTKD5","url":"https://www.omim.org/entry/614272"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Mitochondria","reliability":"Supported"},{"location":"End piece","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"heart 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Cloning and expression of coi and its interference with c1 repressor function.","date":"1990","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/2211669","citation_count":20,"is_preprint":false},{"pmid":"31299394","id":"PMC_31299394","title":"Role of ectopically expressed mtDNA encoded cytochrome c oxidase subunit I (MT-COI) in tumorigenesis.","date":"2019","source":"Mitochondrion","url":"https://pubmed.ncbi.nlm.nih.gov/31299394","citation_count":19,"is_preprint":false},{"pmid":"21225199","id":"PMC_21225199","title":"A new mtDNA COI gene lineage closely related to Anopheles janconnae of the Albitarsis complex in the Caribbean region of Colombia.","date":"2010","source":"Memorias do Instituto Oswaldo Cruz","url":"https://pubmed.ncbi.nlm.nih.gov/21225199","citation_count":19,"is_preprint":false},{"pmid":"28105930","id":"PMC_28105930","title":"Genetic diversity among eight Dendrolimus species in Eurasia (Lepidoptera: Lasiocampidae) inferred from mitochondrial COI and COII, and nuclear ITS2 markers.","date":"2016","source":"BMC genetics","url":"https://pubmed.ncbi.nlm.nih.gov/28105930","citation_count":19,"is_preprint":false},{"pmid":"20442767","id":"PMC_20442767","title":"Dissimilarity of species and forms of planktonic Neocalanus copepods using mitochondrial COI, 12S, nuclear ITS, and 28S gene sequences.","date":"2010","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/20442767","citation_count":18,"is_preprint":false},{"pmid":"30451423","id":"PMC_30451423","title":"Discovery and Identification of Meloidogyne Species Using COI DNA Barcoding.","date":"2018","source":"Journal of nematology","url":"https://pubmed.ncbi.nlm.nih.gov/30451423","citation_count":17,"is_preprint":false},{"pmid":"34224654","id":"PMC_34224654","title":"Hidden diversity of Ctenophora revealed by new mitochondrial COI primers and sequences.","date":"2021","source":"Molecular ecology resources","url":"https://pubmed.ncbi.nlm.nih.gov/34224654","citation_count":17,"is_preprint":false},{"pmid":"25605486","id":"PMC_25605486","title":"Comparison of mitochondrial-related transcriptional levels of TFAM, NRF1 and MT-CO1 genes in single human oocytes at various stages of the oocyte maturation.","date":"2015","source":"Iranian biomedical journal","url":"https://pubmed.ncbi.nlm.nih.gov/25605486","citation_count":17,"is_preprint":false},{"pmid":"9254918","id":"PMC_9254918","title":"The main features of the craniate mitochondrial DNA between the ND1 and the COI genes were established in the common ancestor with the lancelet.","date":"1997","source":"Molecular biology and evolution","url":"https://pubmed.ncbi.nlm.nih.gov/9254918","citation_count":17,"is_preprint":false},{"pmid":"15019626","id":"PMC_15019626","title":"A molecular phylogeny of eurytomid wasps inferred from DNA sequence data of 28S, 18S, 16S, and COI genes.","date":"2004","source":"Molecular phylogenetics and evolution","url":"https://pubmed.ncbi.nlm.nih.gov/15019626","citation_count":17,"is_preprint":false},{"pmid":"23806568","id":"PMC_23806568","title":"Novel genetic diversity within Anopheles punctimacula s.l.: phylogenetic discrepancy between the Barcode cytochrome c oxidase I (COI) gene and the rDNA second internal transcribed spacer (ITS2).","date":"2013","source":"Acta tropica","url":"https://pubmed.ncbi.nlm.nih.gov/23806568","citation_count":17,"is_preprint":false},{"pmid":"28818649","id":"PMC_28818649","title":"Sequence analysis of mtDNA COI barcode region revealed three haplotypes within Culex pipiens assemblage.","date":"2017","source":"Experimental parasitology","url":"https://pubmed.ncbi.nlm.nih.gov/28818649","citation_count":16,"is_preprint":false},{"pmid":"27937065","id":"PMC_27937065","title":"An evaluation of the suitability of COI and COII gene variation for reconstructing the phylogeny of, and identifying cryptic species in, anopheline mosquitoes (Diptera Culicidae).","date":"2016","source":"Mitochondrial DNA. Part A, DNA mapping, sequencing, and analysis","url":"https://pubmed.ncbi.nlm.nih.gov/27937065","citation_count":16,"is_preprint":false},{"pmid":"25693693","id":"PMC_25693693","title":"High-altitude adaptation of Tibetan chicken from MT-COI and ATP-6 perspective.","date":"2015","source":"Mitochondrial DNA. Part A, DNA mapping, sequencing, and analysis","url":"https://pubmed.ncbi.nlm.nih.gov/25693693","citation_count":15,"is_preprint":false},{"pmid":"33276723","id":"PMC_33276723","title":"Efficient COI barcoding using high throughput single-end 400 bp sequencing.","date":"2020","source":"BMC genomics","url":"https://pubmed.ncbi.nlm.nih.gov/33276723","citation_count":15,"is_preprint":false},{"pmid":"26358817","id":"PMC_26358817","title":"Genetic identification and phylogenetic relationships of Indian clariids based on mitochondrial COI sequences.","date":"2015","source":"Mitochondrial DNA. Part A, DNA mapping, sequencing, and analysis","url":"https://pubmed.ncbi.nlm.nih.gov/26358817","citation_count":15,"is_preprint":false},{"pmid":"21181271","id":"PMC_21181271","title":"Using COI gene sequence to barcode two morphologically alike species: the cotton bollworm and the oriental tobacco budworm (Lepidoptera: Noctuidae).","date":"2010","source":"Molecular biology reports","url":"https://pubmed.ncbi.nlm.nih.gov/21181271","citation_count":15,"is_preprint":false},{"pmid":"37308979","id":"PMC_37308979","title":"Improving the COI DNA barcoding library for Neotropical phlebotomine sand flies (Diptera: Psychodidae).","date":"2023","source":"Parasites & vectors","url":"https://pubmed.ncbi.nlm.nih.gov/37308979","citation_count":14,"is_preprint":false},{"pmid":"36576962","id":"PMC_36576962","title":"Morphology, nuclear SNPs and mate selection reveal that COI barcoding overestimates species diversity in a Mediterranean freshwater amphipod by an order of magnitude.","date":"2022","source":"Cladistics : the international journal of the Willi Hennig Society","url":"https://pubmed.ncbi.nlm.nih.gov/36576962","citation_count":14,"is_preprint":false},{"pmid":"32406757","id":"PMC_32406757","title":"coil: an R package for cytochrome c oxidase I (COI) DNA barcode data cleaning, translation, and error evaluation.","date":"2020","source":"Genome","url":"https://pubmed.ncbi.nlm.nih.gov/32406757","citation_count":14,"is_preprint":false},{"pmid":"23544616","id":"PMC_23544616","title":"COI barcodes and phylogeny of doves (Columbidae family).","date":"2013","source":"Mitochondrial DNA","url":"https://pubmed.ncbi.nlm.nih.gov/23544616","citation_count":14,"is_preprint":false},{"pmid":"22924838","id":"PMC_22924838","title":"Mitochondrial DNA (COI) analyses reveal that amphipod diversity is associated with environmental heterogeneity in deep-sea habitats.","date":"2012","source":"Molecular ecology","url":"https://pubmed.ncbi.nlm.nih.gov/22924838","citation_count":14,"is_preprint":false},{"pmid":"22387211","id":"PMC_22387211","title":"ALG11--a new variable DNA marker for sponge phylogeny: comparison of phylogenetic performances with the 18S rDNA and the COI gene.","date":"2012","source":"Molecular phylogenetics and evolution","url":"https://pubmed.ncbi.nlm.nih.gov/22387211","citation_count":14,"is_preprint":false},{"pmid":"27317884","id":"PMC_27317884","title":"DNA barcoding in autotrophic euglenids: evaluation of COI and 18s rDNA.","date":"2016","source":"Journal of phycology","url":"https://pubmed.ncbi.nlm.nih.gov/27317884","citation_count":13,"is_preprint":false},{"pmid":"33946786","id":"PMC_33946786","title":"Monocarboxylate Transporters 1 and 4 and MTCO1 in Gastric Cancer.","date":"2021","source":"Cancers","url":"https://pubmed.ncbi.nlm.nih.gov/33946786","citation_count":12,"is_preprint":false},{"pmid":"30207067","id":"PMC_30207067","title":"Association between the T6459C point mutation of the mitochondrial MT-CO1 gene and susceptibility to sepsis among Chinese Han people.","date":"2018","source":"Journal of cellular and molecular medicine","url":"https://pubmed.ncbi.nlm.nih.gov/30207067","citation_count":12,"is_preprint":false},{"pmid":"22615962","id":"PMC_22615962","title":"Distinct genetic lineages of Bactrocera caudata (Insecta: Tephritidae) revealed by COI and 16S DNA sequences.","date":"2012","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/22615962","citation_count":12,"is_preprint":false},{"pmid":"32084625","id":"PMC_32084625","title":"Molecular taxonomy and phylogenetic inferences of Bichromomyia flaviscutellata complex based on the COI gene DNA barcode region.","date":"2020","source":"Infection, genetics and evolution : journal of molecular epidemiology and evolutionary genetics in infectious diseases","url":"https://pubmed.ncbi.nlm.nih.gov/32084625","citation_count":12,"is_preprint":false},{"pmid":"10971692","id":"PMC_10971692","title":"Mitochondrial DNA CoI haplotype variation in sibling species of rough periwinkles.","date":"2000","source":"Heredity","url":"https://pubmed.ncbi.nlm.nih.gov/10971692","citation_count":12,"is_preprint":false},{"pmid":"34772985","id":"PMC_34772985","title":"First report of mitochondrial COI in foraminifera and implications for DNA barcoding.","date":"2021","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/34772985","citation_count":11,"is_preprint":false},{"pmid":"29873880","id":"PMC_29873880","title":"Development of internal COI primers to improve and extend barcoding of fruit flies (Diptera: Tephritidae: Dacini).","date":"2018","source":"Insect science","url":"https://pubmed.ncbi.nlm.nih.gov/29873880","citation_count":11,"is_preprint":false},{"pmid":"33401907","id":"PMC_33401907","title":"High-Resolution Melting Analysis of COI Sequences Distinguishes Pufferfish Species (Takifugu spp.) in China.","date":"2021","source":"Journal of agricultural and food chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/33401907","citation_count":11,"is_preprint":false},{"pmid":"34367592","id":"PMC_34367592","title":"Species diversity of freshwater shrimp in Henan Province, China, based on morphological characters and COI mitochondrial gene.","date":"2021","source":"Ecology and evolution","url":"https://pubmed.ncbi.nlm.nih.gov/34367592","citation_count":11,"is_preprint":false},{"pmid":"28712321","id":"PMC_28712321","title":"Assessing the effectiveness of mitochondrial COI and 16S rRNA genes for DNA barcoding of farmland spiders in China.","date":"2017","source":"Mitochondrial DNA. Part A, DNA mapping, sequencing, and analysis","url":"https://pubmed.ncbi.nlm.nih.gov/28712321","citation_count":11,"is_preprint":false},{"pmid":"30313829","id":"PMC_30313829","title":"Phylogenetic relationships of Scelimeninae genera (Orthoptera: Tetrigoidea) based on COI, 16S rRNA and 18S rRNA gene sequences.","date":"2018","source":"Zootaxa","url":"https://pubmed.ncbi.nlm.nih.gov/30313829","citation_count":11,"is_preprint":false},{"pmid":"36529191","id":"PMC_36529191","title":"Mitochondrial COI and Cytb gene as valid molecular identification marker of sandfly species (Diptera: Psychodidae) in China.","date":"2022","source":"Acta tropica","url":"https://pubmed.ncbi.nlm.nih.gov/36529191","citation_count":10,"is_preprint":false},{"pmid":"24956508","id":"PMC_24956508","title":"Mitochondrial encephalomyopathy with cytochrome c oxidase deficiency caused by a novel mutation in the MTCO1 gene.","date":"2014","source":"Mitochondrion","url":"https://pubmed.ncbi.nlm.nih.gov/24956508","citation_count":10,"is_preprint":false},{"pmid":"32846590","id":"PMC_32846590","title":"Application of DNA barcoding in fish identification of supermarkets in Henan province, China: More and longer COI gene sequences were obtained by designing new primers.","date":"2020","source":"Food research international (Ottawa, Ont.)","url":"https://pubmed.ncbi.nlm.nih.gov/32846590","citation_count":10,"is_preprint":false},{"pmid":"30743023","id":"PMC_30743023","title":"Adult-onset Leigh syndrome linked to the novel stop codon mutation m.6579G>A in MT-CO1.","date":"2019","source":"Mitochondrion","url":"https://pubmed.ncbi.nlm.nih.gov/30743023","citation_count":9,"is_preprint":false},{"pmid":"32330378","id":"PMC_32330378","title":"Mitochondrial COI gene is valid to delimitate Tylenchidae (Nematoda: Tylenchomorpha) species.","date":"2020","source":"Journal of nematology","url":"https://pubmed.ncbi.nlm.nih.gov/32330378","citation_count":9,"is_preprint":false},{"pmid":"24102599","id":"PMC_24102599","title":"Mitochondrial DNA polymorphism in genes encoding ND1, COI and CYTB in canine malignant cancers.","date":"2013","source":"Mitochondrial DNA","url":"https://pubmed.ncbi.nlm.nih.gov/24102599","citation_count":9,"is_preprint":false},{"pmid":"31821324","id":"PMC_31821324","title":"RNA-sequencing reveals that STRN, ZNF484 and WNK1 add to the value of mitochondrial MT-COI and COX10 as markers of unstable coronary artery disease.","date":"2019","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/31821324","citation_count":9,"is_preprint":false},{"pmid":"36093332","id":"PMC_36093332","title":"Mitochondrial cytochrome c oxidase subunit I (COI) metabarcoding of Foraminifera communities using taxon-specific primers.","date":"2022","source":"PeerJ","url":"https://pubmed.ncbi.nlm.nih.gov/36093332","citation_count":9,"is_preprint":false},{"pmid":"36577477","id":"PMC_36577477","title":"Is Psathyromyia shannoni (Diptera: Psychodidae: Phlebotominae) a species complex? Retrospective study of genetic diversity of COI gene, pathogens and geographic distribution.","date":"2022","source":"Acta tropica","url":"https://pubmed.ncbi.nlm.nih.gov/36577477","citation_count":9,"is_preprint":false},{"pmid":"30393862","id":"PMC_30393862","title":"A method to detect allergenic fish, specifically cod and pollock, using quantitative real-time PCR and COI DNA barcoding sequences.","date":"2018","source":"Journal of the science of food and agriculture","url":"https://pubmed.ncbi.nlm.nih.gov/30393862","citation_count":9,"is_preprint":false},{"pmid":"29062843","id":"PMC_29062843","title":"Utility of mtDNA-COI Barcode Region for Phylogenetic Relationship and Diagnosis of Five Common Pest Cockroaches.","date":"2017","source":"Journal of arthropod-borne diseases","url":"https://pubmed.ncbi.nlm.nih.gov/29062843","citation_count":9,"is_preprint":false},{"pmid":"15483657","id":"PMC_15483657","title":"Mitochondrial COI-NC-COII sequences in talitrid amphipods (Crustacea).","date":"2005","source":"Heredity","url":"https://pubmed.ncbi.nlm.nih.gov/15483657","citation_count":8,"is_preprint":false},{"pmid":"32381246","id":"PMC_32381246","title":"Molecular identification of forensically important fly species in Spain using COI barcodes.","date":"2019","source":"Science & justice : journal of the Forensic Science Society","url":"https://pubmed.ncbi.nlm.nih.gov/32381246","citation_count":8,"is_preprint":false},{"pmid":"29788324","id":"PMC_29788324","title":"The Application of COI Gene for Species Identification of Forensically Important Muscid Flies (Diptera: Muscidae).","date":"2018","source":"Journal of medical entomology","url":"https://pubmed.ncbi.nlm.nih.gov/29788324","citation_count":8,"is_preprint":false},{"pmid":"25857192","id":"PMC_25857192","title":"Further resolving the phylogeny of Myxogastria (slime molds) based on COI and SSU rRNA genes.","date":"2015","source":"Genetika","url":"https://pubmed.ncbi.nlm.nih.gov/25857192","citation_count":8,"is_preprint":false},{"pmid":"26072670","id":"PMC_26072670","title":"Morphological identification and COI barcodes of adult flies help determine species identities of chironomid larvae (Diptera, Chironomidae).","date":"2015","source":"Bulletin of entomological research","url":"https://pubmed.ncbi.nlm.nih.gov/26072670","citation_count":8,"is_preprint":false},{"pmid":"26268569","id":"PMC_26268569","title":"Molecular characterization of Stictodora tridactyla (Trematoda: Heterophyidae) from Kuwait Bay using rDNA ITS and mtCO1.","date":"2015","source":"Parasitology research","url":"https://pubmed.ncbi.nlm.nih.gov/26268569","citation_count":7,"is_preprint":false},{"pmid":"34606010","id":"PMC_34606010","title":"PFP@PLGA/Cu12Sb4S13-mediated PTT ablates hepatocellular carcinoma by inhibiting the RAS/MAPK/MT-CO1 signaling pathway.","date":"2021","source":"Nano convergence","url":"https://pubmed.ncbi.nlm.nih.gov/34606010","citation_count":7,"is_preprint":false},{"pmid":"38097151","id":"PMC_38097151","title":"New sand fly (Diptera, Psychodidae) records and COI DNA barcodes in the state of Maranhão, Eastern Amazon, Brazil.","date":"2023","source":"Acta tropica","url":"https://pubmed.ncbi.nlm.nih.gov/38097151","citation_count":7,"is_preprint":false},{"pmid":"38956928","id":"PMC_38956928","title":"Towards a better future for DNA barcoding: Evaluating monophyly- and distance-based species identification using COI gene fragments of Dacini fruit flies.","date":"2024","source":"Molecular ecology resources","url":"https://pubmed.ncbi.nlm.nih.gov/38956928","citation_count":7,"is_preprint":false},{"pmid":"36913994","id":"PMC_36913994","title":"Molecular identification and genetic diversity of equine ocular setariasis in Thailand based on the COI, 12S rDNA, and ITS1 regions.","date":"2023","source":"Infection, genetics and evolution : journal of molecular epidemiology and evolutionary genetics in infectious diseases","url":"https://pubmed.ncbi.nlm.nih.gov/36913994","citation_count":7,"is_preprint":false},{"pmid":"24047160","id":"PMC_24047160","title":"A comparative study of COI and 16 S rRNA genes for DNA barcoding of cultivable carps in India.","date":"2013","source":"Mitochondrial DNA","url":"https://pubmed.ncbi.nlm.nih.gov/24047160","citation_count":7,"is_preprint":false},{"pmid":"33831346","id":"PMC_33831346","title":"The utilisation of CytB and COI barcodes for the identification of bloodmeals and Culicoides species (Diptera: Ceratopogonidae) reveals a variety of novel wildlife hosts in South Africa.","date":"2021","source":"Acta tropica","url":"https://pubmed.ncbi.nlm.nih.gov/33831346","citation_count":7,"is_preprint":false},{"pmid":"33777533","id":"PMC_33777533","title":"DNA metabarcoding of zooplankton communities: species diversity and seasonal variation revealed by 18S rRNA and COI.","date":"2021","source":"PeerJ","url":"https://pubmed.ncbi.nlm.nih.gov/33777533","citation_count":7,"is_preprint":false},{"pmid":"31121918","id":"PMC_31121918","title":"Mitochondrial Gene Sequence (COI) Reveals the Genetic Structure and Demographic History of Lymantria dispar (Lepidoptera: Erebidae: Lymantriinae) in and around China.","date":"2019","source":"Insects","url":"https://pubmed.ncbi.nlm.nih.gov/31121918","citation_count":7,"is_preprint":false},{"pmid":"26909963","id":"PMC_26909963","title":"Analysis of the mitochondrial COI gene and its informative potential for evolutionary inferences in the families Coreidae and Pentatomidae (Heteroptera).","date":"2016","source":"Genetics and molecular research : GMR","url":"https://pubmed.ncbi.nlm.nih.gov/26909963","citation_count":7,"is_preprint":false},{"pmid":"25189813","id":"PMC_25189813","title":"Demographic history and population structure of Anopheles pseudopunctipennis in Argentina based on the mitochondrial COI gene.","date":"2014","source":"Parasites & vectors","url":"https://pubmed.ncbi.nlm.nih.gov/25189813","citation_count":7,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":48889,"output_tokens":2678,"usd":0.093419,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":9469,"output_tokens":2833,"usd":0.059085,"stage2_stop_reason":"end_turn"},"total_usd":0.152504,"stage1_batch_id":"msgbatch_01BbTCMyrRPyhtEq6b1MdwCN","stage2_batch_id":"msgbatch_011dEed5bbxYvTAaQWKJevxu","note":"batch pricing = 50% of standard"},"stage1_raw":"Looking through these 100 papers, I need to identify which ones describe mechanistic findings about MT-CO1 (the human mitochondrial cytochrome c oxidase subunit I gene, also known as MTCO1/COI).\n\nMost papers (1-16, 18-33, 37-55, 57-62, 64-76, 78, 79, 81-100) are about COI as a DNA barcoding marker for species identification in various organisms - these are not mechanistic studies about the MT-CO1 protein.\n\nPapers relevant to MT-CO1 as a protein/gene with mechanistic findings:\n- PMID 23509693 (Arnold 2012): Prostate cancer mutation - functional studies\n- PMID 18484665 (Herrero-Martín 2008): Pathologic mtDNA mutation\n- PMID 29610859 (Collins 2018): V83I polymorphism function - Y2H, ELISA\n- PMID 31299394 (Singh 2019): MT-CO1 overexpression in tumorigenesis\n- PMID 24956508 (Debray 2014): Novel MTCO1 mutation causing COX deficiency\n- PMID 30743023 (Poole 2019): MT-CO1 stop codon mutation - Leigh syndrome\n- PMID 30207067 (Shen 2018): T6459C mutation - cellular function studies\n- PMID 34606010 (Dong 2021): RAS/MAPK/MT-CO1 signaling pathway\n\nPaper PMID 1740459 and 2211669 are about bacteriophage P1 \"coi\" gene - completely different from human MT-CO1. These are symbol collisions - EXCLUDE.\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2012,\n      \"finding\": \"A heteroplasmic mutation in MT-CO1 (derived from a prostate cancer patient) simultaneously decreased cytochrome oxidation activity, increased reactive oxygen species (ROS), and increased reactive nitrogen species in functional cellular assays, suggesting the mutation impairs complex IV electron transfer and promotes oxidative/nitrosative stress.\",\n      \"method\": \"Functional cellular assays measuring cytochrome oxidase activity, ROS levels, and reactive nitrogen in cells harboring the patient-derived MT-CO1 mutation\",\n      \"journal\": \"BioMed research international\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — direct functional assays with patient-derived mutation in cellular system, single lab, single study with multiple readouts but no reconstitution or structural validation\",\n      \"pmids\": [\"23509693\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"A novel missense mutation m.6955G>A in MT-CO1 was identified as pathogenic, causing a mitochondrial energy metabolism disorder (moderate mental retardation and mild exercise intolerance), establishing that missense mutations in MT-CO1 can produce a clinically distinct phenotype beyond myopathy.\",\n      \"method\": \"Clinical phenotyping, mtDNA sequencing, biochemical analysis of mitochondrial respiratory chain\",\n      \"journal\": \"Human mutation\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single patient case with sequencing and clinical correlation, no in vitro reconstitution or mechanistic dissection of the mutation's biochemical effect\",\n      \"pmids\": [\"18484665\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"A novel heteroplasmic frameshift mutation (m.7402delC) in MTCO1 causes premature termination of the MT-CO1 polypeptide, resulting in cytochrome c oxidase (complex IV) deficiency demonstrated by COX-negative fibers on muscle biopsy and decreased complex IV activity in homogenate; single fiber PCR showed co-segregation of high mutant load with COX-negative fibers.\",\n      \"method\": \"Next-generation sequencing of mtDNA, muscle biopsy histochemistry (COX staining), spectrophotometric complex IV activity assay, single fiber PCR\",\n      \"journal\": \"Mitochondrion\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (sequencing, histochemistry, enzymatic assay, single-fiber PCR) in a single study establishing direct link between MT-CO1 truncation and COX deficiency\",\n      \"pmids\": [\"24956508\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"The MT-CO1 V83I polymorphism (m.6150G>A) disrupts binding of amyloid beta peptide (Aβ) to the V83 region of MT-CO1, as demonstrated by ELISA. A yeast two-hybrid screen further identified UBQLN1 (a neuroprotective protein) as an interactor of the V83 region of MT-CO1, an interaction also disrupted by V83I.\",\n      \"method\": \"Yeast two-hybrid (Y2H) cDNA library screen using V83 region of CO1 as bait; ELISA quantification of Aβ–CO1 protein-protein interaction with wild-type vs. V83I variant\",\n      \"journal\": \"Investigative ophthalmology & visual science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — two orthogonal binding assays (Y2H and ELISA) in single lab identifying novel interaction partners and demonstrating disruption by variant\",\n      \"pmids\": [\"29610859\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Ectopic over-expression of codon-optimized wild-type or mutant MT-CO1 in mammalian cells promoted anchorage-dependent and -independent proliferation, induced a cancer metabolic phenotype (high glucose uptake and lactate release), generated elevated ROS, differentially regulated apoptosis and DNA damage pathway genes, and down-regulated DNMT3A and DNMT3B, leading to altered CpG island methylation at promoters of pro-cancerous genes. MT-CO1 protein localized to mitochondria but showed high aggregation under denaturing conditions.\",\n      \"method\": \"Codon optimization and ectopic expression of MT-CO1 in transfected cells; mitochondrial localization by fractionation/imaging; proliferation assays (anchorage-dependent and -independent); metabolic assays (glucose uptake, lactate); ROS measurement; gene expression profiling; DNA methylation analysis\",\n      \"journal\": \"Mitochondrion\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal functional readouts in a single lab using a novel codon-optimized expression system, but no structural validation or independent replication\",\n      \"pmids\": [\"31299394\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"The mitochondrial T6459C point mutation in MT-CO1 (affecting the MT-CO1 coding sequence) was associated with increased cellular ROS levels, increased apoptosis, decreased mitochondrial membrane potential, and decreased ATP concentrations both at baseline and after LPS stimulation, establishing a functional link between this MT-CO1 variant and mitochondrial dysfunction relevant to sepsis susceptibility.\",\n      \"method\": \"Family pedigree analysis; cellular ROS measurement, mitochondrial membrane potential assay, apoptosis assay, ATP quantification in peripheral blood cells from mutation carriers vs. non-carriers; LPS stimulation experiment\",\n      \"journal\": \"Journal of cellular and molecular medicine\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — cellular functional assays but conducted in primary cells from a single pedigree, small sample sizes, no biochemical reconstitution of the mutation's effect on complex IV\",\n      \"pmids\": [\"30207067\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"A novel stop codon mutation m.6579G>A (p.Gly226X) in MT-CO1 causes premature truncation of the MT-CO1 polypeptide and is associated with COX-deficient fibers in muscle, establishing that MT-CO1 truncating mutations can present as adult-onset Leigh syndrome.\",\n      \"method\": \"Whole mitochondrial genome sequencing; muscle biopsy with COX histochemistry showing COX-deficient fibers; clinical phenotyping\",\n      \"journal\": \"Mitochondrion\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single patient case with sequencing and histochemistry, no direct biochemical measurement of complex IV activity or mechanistic dissection beyond mutation identification\",\n      \"pmids\": [\"30743023\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"In HCC cells, photothermal treatment mediated by a nanocapsule inhibited proliferation, induced apoptosis, and decreased cell motility; these effects were associated with inhibition of the RAS/MAPK/MT-CO1 signaling pathway, placing MT-CO1 downstream of RAS/MAPK in a pro-survival/proliferation axis in hepatocellular carcinoma.\",\n      \"method\": \"In vitro HCC cell treatment with photothermal nanocapsule (PPCu); proliferation, apoptosis, and motility assays; pathway analysis implicating RAS/MAPK/MT-CO1\",\n      \"journal\": \"Nano convergence\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — pathway placement inferred from cell-based assays with a complex intervention (photothermal nanoparticle), indirect evidence for MT-CO1's specific role, single lab, no genetic epistasis or direct biochemical validation of pathway order\",\n      \"pmids\": [\"34606010\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"MT-CO1 encodes the catalytic core subunit I of mitochondrial complex IV (cytochrome c oxidase); pathogenic mutations (missense, frameshift, or stop codon) in MT-CO1 impair complex IV electron transfer activity, reduce mitochondrial membrane potential and ATP production, elevate reactive oxygen species, and cause COX-deficient fibers in muscle, while the protein's V83 region mediates interactions with amyloid beta peptide and the neuroprotective protein UBQLN1, and over-expression of MT-CO1 can drive a pro-cancerous metabolic phenotype associated with altered ROS, epigenetic reprogramming, and activation of a RAS/MAPK/MT-CO1 pro-survival axis.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"MT-CO1 encodes the catalytic core subunit of mitochondrial cytochrome c oxidase (complex IV), and mutations across its coding sequence impair complex IV electron transfer with downstream consequences for mitochondrial bioenergetics and redox state [#0]. Truncating mutations—both a heteroplasmic frameshift (m.7402delC) and a stop codon (m.6579G>A, p.Gly226X)—prematurely terminate the polypeptide and produce COX-negative muscle fibers with reduced complex IV activity, with single-fiber analysis showing co-segregation of high mutant load with COX deficiency [#2, #6]. Missense and point mutations similarly compromise function, decreasing cytochrome oxidase activity, lowering mitochondrial membrane potential and ATP, and elevating reactive oxygen and nitrogen species [#0, #5]. Beyond its catalytic role, the V83 region of MT-CO1 mediates protein–protein interactions with amyloid beta peptide and the neuroprotective protein UBQLN1, both of which are disrupted by the V83I (m.6150G>A) polymorphism [#3]. Ectopic over-expression of MT-CO1 drives a pro-cancerous metabolic phenotype—increased glucose uptake and lactate release, elevated ROS, and down-regulation of DNMT3A/DNMT3B with altered promoter CpG methylation—and MT-CO1 has been placed downstream of a RAS/MAPK pro-survival axis in hepatocellular carcinoma cells [#4, #7].\",\n  \"teleology\": [\n    {\n      \"year\": 2008,\n      \"claim\": \"Established that MT-CO1 missense mutations can cause clinically distinct mitochondrial energy disorders beyond classical myopathy, broadening the phenotypic spectrum attributable to this subunit.\",\n      \"evidence\": \"Clinical phenotyping, mtDNA sequencing, and respiratory chain biochemistry in a single patient carrying m.6955G>A\",\n      \"pmids\": [\"18484665\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Single patient case without in vitro reconstitution\", \"No mechanistic dissection of the missense mutation's effect on complex IV assembly or activity\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Linked a patient-derived MT-CO1 mutation directly to impaired electron transfer and oxidative/nitrosative stress, connecting the subunit to redox dysregulation in cancer.\",\n      \"evidence\": \"Functional cellular assays of cytochrome oxidase activity, ROS, and reactive nitrogen in cells harboring a prostate-cancer-derived MT-CO1 mutation\",\n      \"pmids\": [\"23509693\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural or reconstitution validation\", \"Single lab, single study\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Demonstrated that a truncating frameshift mutation causally produces complex IV deficiency, establishing a direct genotype–biochemical–histological chain for MT-CO1 loss of function.\",\n      \"evidence\": \"NGS of mtDNA, COX histochemistry, spectrophotometric complex IV assay, and single-fiber PCR showing co-segregation of mutant load with COX-negative fibers\",\n      \"pmids\": [\"24956508\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No reconstitution of the truncated protein's effect on assembly\", \"Single pedigree\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Identified a non-catalytic interaction surface (V83 region) of MT-CO1 that binds amyloid beta and UBQLN1, and showed a natural polymorphism abolishes these interactions—pointing to a role beyond electron transfer.\",\n      \"evidence\": \"Yeast two-hybrid screen and ELISA comparing wild-type versus V83I binding\",\n      \"pmids\": [\"29610859\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Interactions not validated in a cellular or mitochondrial context\", \"Functional consequence of UBQLN1/Aβ binding to MT-CO1 unresolved\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Tied a specific point mutation to the integrated mitochondrial dysfunction phenotype (raised ROS, depolarization, reduced ATP, increased apoptosis), connecting MT-CO1 variation to sepsis susceptibility.\",\n      \"evidence\": \"Family pedigree analysis with ROS, membrane potential, apoptosis, and ATP assays in carrier peripheral blood cells, with and without LPS\",\n      \"pmids\": [\"30207067\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Primary cells from a single small pedigree\", \"No biochemical reconstitution of the mutation's effect on complex IV\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Showed that MT-CO1 over-expression is not merely a passenger but can actively impose a pro-cancerous metabolic and epigenetic state, implicating the subunit as a driver of malignant reprogramming.\",\n      \"evidence\": \"Codon-optimized ectopic MT-CO1 expression with proliferation, metabolic, ROS, gene expression, and DNA methylation profiling\",\n      \"pmids\": [\"31299394\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural validation; protein aggregated under denaturing conditions\", \"No independent replication of the epigenetic effects\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Confirmed that truncating MT-CO1 mutations can present as adult-onset Leigh syndrome, extending the clinical reach of subunit loss of function.\",\n      \"evidence\": \"Whole mitochondrial genome sequencing and COX histochemistry showing COX-deficient fibers in a patient with m.6579G>A (p.Gly226X)\",\n      \"pmids\": [\"30743023\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Single patient case\", \"No direct complex IV activity measurement\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Placed MT-CO1 downstream of RAS/MAPK in a pro-survival/proliferation axis in hepatocellular carcinoma, suggesting it integrates oncogenic signaling with mitochondrial output.\",\n      \"evidence\": \"In vitro HCC photothermal nanocapsule treatment with proliferation, apoptosis, and motility assays implicating RAS/MAPK/MT-CO1\",\n      \"pmids\": [\"34606010\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Pathway order inferred without genetic epistasis\", \"Complex intervention provides only indirect evidence for MT-CO1's specific role\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How MT-CO1's non-catalytic interactions (Aβ, UBQLN1) and its over-expression-driven oncogenic phenotype mechanistically connect to its core role in complex IV electron transfer remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No structural model linking V83-region binding to catalytic function\", \"Mechanism by which over-expressed MT-CO1 down-regulates DNMTs is unknown\", \"RAS/MAPK/MT-CO1 axis lacks direct biochemical validation\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016491\", \"supporting_discovery_ids\": [0, 2]},\n      {\"term_id\": \"GO:0009055\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [4]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [0, 4]}\n    ],\n    \"complexes\": [\"cytochrome c oxidase (complex IV)\"],\n    \"partners\": [\"APP\", \"UBQLN1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}