{"gene":"COX14","run_date":"2026-06-09T22:57:19","timeline":{"discoveries":[{"year":1995,"finding":"COX14 encodes a low molecular mass protein (~8 kDa) required for cytochrome c oxidase assembly in yeast. Cox14p localizes to the mitochondrial membrane and is associated with a high molecular weight complex, but is not a subunit of cytochrome oxidase itself. cox14 null mutants lack COX activity despite normal synthesis of mitochondrially encoded Cox1, Cox2, and Cox3 subunits, indicating a post-translational assembly role.","method":"Complementation cloning, Western analysis, biotinylated gene fusion localization, native complex analysis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (complementation, Western, localization, assembly analysis) in the founding paper; replicated by subsequent studies","pmids":["7797555"],"is_preprint":false},{"year":2004,"finding":"Cox14p and Mss51p interact with each other and with newly synthesized Cox1p to form a transient Cox14p-Cox1p-Mss51p complex. This complex functions to downregulate Cox1p synthesis (negative feedback). Deletion of COX14 does not affect Cox1p synthesis even when other COX assembly genes are mutated, unlike most assembly mutants, because Cox14p is required to sequester Mss51p.","method":"Co-immunoprecipitation, pulse-labeling of mitochondrial translation products, epistasis analysis with mss51 suppressor mutations","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP and pulse-labeling in same study; independently replicated by multiple labs","pmids":["15306853"],"is_preprint":false},{"year":2007,"finding":"Shy1 (yeast SURF1 ortholog) interacts with Mss51 and Cox14, linking translational regulation of Cox1 to complex IV assembly. Cox14-containing partially assembled complex IV intermediates bound to Shy1 can associate with the bc1 complex to form transitional supercomplexes.","method":"Co-immunoprecipitation, blue-native PAGE, identification of assembly intermediates","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP and BN-PAGE, replicated by multiple labs","pmids":["17882259"],"is_preprint":false},{"year":2009,"finding":"Mss51 does not stably interact with newly synthesized Cox1 in cox14 mutants, demonstrating that Cox14 is required for Mss51 sequestration into early Cox1 assembly intermediates. The physical interaction between Mss51 and Cox14 is dependent upon Cox1 synthesis, indicating dynamic assembly of early cytochrome c oxidase intermediates nucleated by Cox1.","method":"Co-immunoprecipitation, pulse-labeling, reporter gene assays in yeast","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP with pulse-labeling, replicated across labs","pmids":["19710419"],"is_preprint":false},{"year":2010,"finding":"Coa3 and Cox14 together form assembly intermediates with newly synthesized Cox1 and are both required for Mss51 association with these complexes. Coa3 and Cox14 promote formation of the latent (translational resting) state of Mss51 and thus downregulate COX1 expression. Lack of either Coa3 or Cox14 traps Mss51 in the committed (translation-effective) state. Coa1 binding to sequestered Mss51 in complex with Cox14, Coa3, and Cox1 is essential for full Mss51 inactivation.","method":"Co-immunoprecipitation, pulse-labeling, sucrose gradient sedimentation, yeast genetics","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods, replicated by independent labs","pmids":["20876281"],"is_preprint":false},{"year":2010,"finding":"Cox14 is an essential component of complexes containing newly synthesized Cox1, Ssc1, and Mss51 in yeast. Cox25 interacts with Cox14 in these complexes. After Ssc1-Mss51 release, Cox25 continues to interact with Cox14 and Cox1 to facilitate formation of multisubunit COX assembly intermediates.","method":"Co-immunoprecipitation, pulse-labeling, genetic analysis in S. cerevisiae","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP and pulse-labeling, consistent with multiple prior studies","pmids":["21068384"],"is_preprint":false},{"year":2010,"finding":"Deletion of the C-terminal 11 or 15 residues of Cox1 eliminates the assembly-feedback control of Cox1 synthesis and reduces the strength of the Mss51-Cox14 interaction, confirming that the Cox1 C-terminal residues are required for Mss51 sequestration via Cox14.","method":"Site-directed mutagenesis of mitochondrial DNA, co-immunoprecipitation, pulse-labeling","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — mutagenesis combined with Co-IP and pulse-labeling, single lab with multiple methods","pmids":["20807763"],"is_preprint":false},{"year":2012,"finding":"C12orf62 (human ortholog of yeast COX14) is a small (~6 kDa) single-transmembrane protein that localizes to mitochondria and elutes in a complex of ~110 kDa. It is required for coupling COX I synthesis with cytochrome c oxidase assembly in humans. A missense mutation (c.88G>A) causes fatal neonatal lactic acidosis with COX assembly defect and specific decrease in COX I synthesis. COX I, II, and IV co-immunoprecipitated with epitope-tagged C12orf62. siRNA knockdown recapitulates the biochemical defect; retroviral expression of wild-type C12orf62 rescues it.","method":"Patient genetics, microcell-mediated chromosome transfer, retroviral complementation, siRNA knockdown, co-immunoprecipitation, BN-2D-PAGE, pulse-labeling","journal":"American journal of human genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (rescue, siRNA, Co-IP, pulse-labeling), patient-derived cells","pmids":["22243966"],"is_preprint":false},{"year":2012,"finding":"C12orf62 is confirmed as the human ortholog of yeast COX14 by iterative orthology prediction (Ortho-Profile). Its role in negative regulation of COX I translation and COX assembly was experimentally verified via co-expression patterns, subcellular localization, and co-purification with human COX-associated proteins.","method":"Computational orthology prediction validated by experimental localization and co-purification","journal":"Genome biology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — orthology supported by localization and co-purification, but experimental validation is limited in scope","pmids":["22356826"],"is_preprint":false},{"year":2015,"finding":"COX14 and COA3 are interdependent for stability: COX14 protein is undetectable in COA3-deficient fibroblasts, and COA3 is undetectable in COX14-deficient fibroblasts. Both exist in an early COX assembly complex containing COX1, coupling COX1 synthesis with holoenzyme assembly.","method":"Immunoblot analysis of patient fibroblasts, BN-PAGE, retroviral complementation, pulse-labeling","journal":"Journal of medical genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — patient fibroblasts with rescue experiments and multiple methods; complements prior yeast data","pmids":["25604084"],"is_preprint":false},{"year":2016,"finding":"Human mitochondrial ribosomes translating COX1 mRNA selectively engage with cytochrome c oxidase assembly factors (including COX14/C12orf62) in the inner membrane. Assembly defects arrest mitochondrial translation in a ribosome nascent chain complex with a partially membrane-inserted COX1 translation product, representing a primed state. This establishes a mammalian translational plasticity pathway whereby COX14 participates in coupling COX1 synthesis to assembly.","method":"Ribosome nascent chain complex isolation, mass spectrometry, sucrose gradient sedimentation, BN-PAGE","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — ribosome nascent chain complex biochemistry with MS, multiple orthogonal methods","pmids":["27693358"],"is_preprint":false},{"year":2017,"finding":"CMC1 forms an early CIV assembly intermediate with COX1 and two assembly factors, COA3 and COX14. CMC1 stabilizes a COX1-COA3-COX14 complex before incorporation of COX4 and COX5a. Whereas COX14 and COA3 have been proposed to affect COX1 mRNA translation, CMC1 regulates turnover of newly synthesized COX1 without affecting the rate of COX1 synthesis.","method":"TALEN-mediated CMC1 knockout, BN-PAGE, co-immunoprecipitation, pulse-labeling, immunoblot","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — KO cell line with multiple orthogonal methods, direct mechanistic dissection of complex membership","pmids":["28082314"],"is_preprint":false},{"year":2017,"finding":"Cox1 C-terminal mutations (P521A/P522A and V524E) reduce binding of both Mss51 and Cox14 to COA complexes, enriching Mss51 in a translationally active form that maintains full Cox1 synthesis even when CcO assembly is blocked. This confirms that the Cox1 C-terminal end is a key structural determinant for Cox14-mediated sequestration of Mss51.","method":"Site-directed mutagenesis of mitochondrial COX1 gene, co-immunoprecipitation, pulse-labeling, BN-PAGE","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — mutagenesis combined with Co-IP, pulse-labeling, and BN-PAGE; single lab with multiple orthogonal methods","pmids":["28490636"],"is_preprint":false},{"year":2017,"finding":"MrpL35 (a mitospecific component of the yeast mitoribosomal central protuberance) coordinates Cox1 synthesis with COX assembly in a manner that involves Cox14 and Coa3 proteins. mrpL35 mutants show COX assembly defects rather than a global inhibition of mitochondrial protein synthesis.","method":"Yeast genetics, co-immunoprecipitation, pulse-labeling","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — genetic and biochemical evidence for Cox14 involvement, but Cox14's specific role is inferred from the context rather than directly tested","pmids":["28931599"],"is_preprint":false},{"year":2024,"finding":"In a COX14 mutant mouse (COX14M19I) corresponding to a patient with complex IV deficiency, loss of COX14 function impairs COX1 translation, causing complex IV deficiency. This triggers increased reactive oxygen species production, which leads to release of mitochondrial RNA into the cytosol, sensed by the RIG-1 pathway, causing severe liver inflammation. A COA3Y72C mouse (affecting a cooperating assembly factor) displays a similar but milder inflammatory phenotype.","method":"Mouse knockout/knockin model, pulse-labeling of mitochondrial translation, ROS measurement, cytosolic RNA detection, pathway analysis","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — mouse genetic model with multiple orthogonal readouts establishing mechanism from COX14 loss to inflammation via ROS-mtRNA-RIG-1 pathway","pmids":["39134548"],"is_preprint":false}],"current_model":"COX14 (C12orf62 in humans) encodes a small single-transmembrane mitochondrial inner membrane protein that is essential for cytochrome c oxidase (complex IV) biogenesis: it forms an early assembly intermediate complex with newly synthesized COX1, COA3, and the translational activator Mss51 (in yeast), thereby coupling COX1 mRNA translation to holoenzyme assembly via a negative feedback loop in which Mss51 is sequestered in the COX1-COX14-COA3 complex when assembly is blocked; in humans, COX14/C12orf62 similarly couples COX1 synthesis to COX assembly, and its loss causes COX1 translation defects, complex IV deficiency, ROS-induced mitochondrial RNA release, and tissue-specific inflammation via the RIG-1 innate immune pathway."},"narrative":{"mechanistic_narrative":"COX14 encodes a small single-transmembrane mitochondrial inner-membrane protein that is essential for biogenesis of cytochrome c oxidase (complex IV) but is not itself a structural subunit of the holoenzyme [PMID:7797555, PMID:22243966]. Its central function is to couple translation of the mitochondrially encoded COX1 subunit to downstream assembly: COX14 forms an early assembly intermediate nucleated by newly synthesized COX1, and in yeast this complex sequesters the translational activator Mss51 into its latent, translation-resting state, thereby imposing a negative feedback loop that downregulates COX1 synthesis when assembly stalls [PMID:15306853, PMID:19710419, PMID:20876281]. Mss51 sequestration requires the C-terminal residues of COX1 and the cooperating factors Coa3/COA3 and Coa1, with which COX14 acts interdependently — COX14 and COA3 are mutually required for each other's stability and reside together in the COX1-containing early intermediate [PMID:20876281, PMID:20807763, PMID:25604084]. This assembly intermediate is handed forward through additional factors including Shy1 (SURF1), Cox25, and CMC1 before incorporation of later COX subunits, and at the ribosome level COX14 engages COX1-translating mitoribosomes to enforce a primed translational state when assembly is blocked [PMID:17882259, PMID:21068384, PMID:27693358, PMID:28082314]. In humans, the COX14 ortholog C12orf62 performs the analogous coupling role, and its loss causes a specific defect in COX1 synthesis with complex IV deficiency [PMID:22243966, PMID:25604084]; a missense mutation causes fatal neonatal lactic acidosis [PMID:22243966]. In a corresponding mouse model, COX14 dysfunction triggers excess reactive oxygen species, release of mitochondrial RNA to the cytosol, and RIG-I–mediated inflammation, linking defective complex IV assembly to innate immune activation [PMID:39134548].","teleology":[{"year":1995,"claim":"Established that COX14 is required for complex IV assembly without being a subunit, distinguishing it as a dedicated assembly factor rather than a structural component.","evidence":"Complementation cloning, Western analysis, and native complex analysis in yeast showing loss of COX activity despite normal Cox1/Cox2/Cox3 synthesis","pmids":["7797555"],"confidence":"High","gaps":["Molecular partners and the step of assembly affected were undefined","Mechanism of post-translational action unknown"]},{"year":2004,"claim":"Identified COX14 as the factor that physically links the translational activator Mss51 to newly made Cox1, defining a negative feedback loop coupling COX1 synthesis to assembly.","evidence":"Reciprocal Co-IP, pulse-labeling of mitochondrial translation, and epistasis with mss51 suppressors in yeast","pmids":["15306853"],"confidence":"High","gaps":["Whether additional factors are needed to form the latent Mss51 state was unresolved","Structural basis of the COX14-Mss51-Cox1 interaction unknown"]},{"year":2007,"claim":"Connected the COX14-Mss51 translational module to the downstream assembly pathway via Shy1/SURF1 and to supercomplex formation.","evidence":"Co-IP and blue-native PAGE identifying COX14-containing intermediates bound to Shy1 and the bc1 complex","pmids":["17882259"],"confidence":"High","gaps":["Order of handoff between intermediates not fully defined"]},{"year":2009,"claim":"Demonstrated that COX14 is required for Mss51 sequestration and that this interaction depends on active Cox1 synthesis, establishing Cox1 as the nucleating subunit of the early intermediate.","evidence":"Co-IP, pulse-labeling, and reporter assays in cox14 mutant yeast","pmids":["19710419"],"confidence":"High","gaps":["Whether other factors stabilize the intermediate was not yet defined"]},{"year":2010,"claim":"Resolved the multi-factor composition controlling Mss51 state, showing Coa3, Cox14, and Coa1 together drive the latent (translation-resting) form, and identified Cox25 as a continuing partner after Mss51 release.","evidence":"Co-IP, pulse-labeling, sucrose gradient sedimentation, and yeast genetics across multiple studies","pmids":["20876281","21068384"],"confidence":"High","gaps":["Stoichiometry and structural arrangement of the intermediate unresolved"]},{"year":2010,"claim":"Mapped the Cox1 C-terminal residues as the structural determinant required for Mss51 sequestration via COX14, providing a molecular handle for the feedback control.","evidence":"Mitochondrial DNA mutagenesis with Co-IP and pulse-labeling in yeast","pmids":["20807763"],"confidence":"High","gaps":["Direct contact between Cox1 C-terminus and COX14 not structurally demonstrated"]},{"year":2012,"claim":"Extended the model to humans, identifying C12orf62/COX14 as the ortholog coupling COX1 synthesis to assembly and linking its mutation to fatal mitochondrial disease.","evidence":"Patient genetics, retroviral complementation rescue, siRNA knockdown, Co-IP, BN-PAGE, and pulse-labeling; orthology prediction validated by localization and co-purification","pmids":["22243966","22356826"],"confidence":"High","gaps":["Human-specific partners beyond COX subunits not fully enumerated","Whether human COX14 regulates an Mss51-equivalent activator was unaddressed"]},{"year":2015,"claim":"Established the mutual stability dependence of COX14 and COA3 in human cells, defining them as an obligate module within the early COX1 intermediate.","evidence":"Immunoblot of patient fibroblasts, BN-PAGE, retroviral complementation, pulse-labeling","pmids":["25604084"],"confidence":"High","gaps":["Biochemical basis of the co-stabilization unknown"]},{"year":2016,"claim":"Showed that COX14 acts at the level of translating mitoribosomes, engaging COX1-synthesizing ribosome nascent chain complexes to enforce a primed translational state under assembly stress.","evidence":"Ribosome nascent chain complex isolation, mass spectrometry, sucrose gradient sedimentation, BN-PAGE in human cells","pmids":["27693358"],"confidence":"High","gaps":["Precise contacts between COX14 and the mitoribosome unresolved"]},{"year":2017,"claim":"Dissected division of labor within the early intermediate, distinguishing COX14/COA3 (proposed translational control) from CMC1 (regulation of COX1 turnover) and confirming the Cox1 C-terminus requirement, refining the composition and function of the COX1 assembly hub.","evidence":"CMC1 knockout cells, mitochondrial COX1 mutagenesis, Co-IP, BN-PAGE, pulse-labeling; yeast genetics with MrpL35","pmids":["28082314","28490636","28931599"],"confidence":"High","gaps":["Mechanistic coupling between the mitoribosome and the intermediate only partly defined","MrpL35 step relies on inferred COX14 involvement"]},{"year":2024,"claim":"Connected COX14 loss to a downstream pathophysiological cascade in vivo, showing impaired COX1 translation drives ROS, mitochondrial RNA release, and RIG-I–mediated inflammation.","evidence":"COX14 M19I knockin mouse with pulse-labeling, ROS measurement, cytosolic RNA detection, and pathway analysis","pmids":["39134548"],"confidence":"High","gaps":["Tissue specificity of the inflammatory response not fully explained","Direct route from ROS to mtRNA release not mechanistically resolved"]},{"year":null,"claim":"How the human COX14 module senses assembly status and feeds back on COX1 translation at structural resolution, and whether a human Mss51-equivalent activator exists, remains unresolved.","evidence":"","pmids":[],"confidence":"High","gaps":["No atomic structure of the COX1-COX14-COA3 intermediate","Human translational activator analogous to yeast Mss51 not identified"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0045182","term_label":"translation regulator activity","supporting_discovery_ids":[1,3,4,7,10]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[1,4]}],"localization":[{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[0,7]}],"pathway":[{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[0,7,9,11]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[1,3,10]}],"complexes":["COX1-COX14-COA3 early complex IV assembly intermediate"],"partners":["COX1","COA3","MSS51","SHY1","COA1","CMC1","COX25"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q96I36","full_name":"Cytochrome c oxidase assembly protein COX14","aliases":[],"length_aa":57,"mass_kda":6.6,"function":"Core component of the MITRAC (mitochondrial translation regulation assembly intermediate of cytochrome c oxidase complex) complex, that regulates cytochrome c oxidase assembly. Requires for coordination of the early steps of cytochrome c oxidase assembly with the synthesis of MT-CO1","subcellular_location":"Mitochondrion outer membrane","url":"https://www.uniprot.org/uniprotkb/Q96I36/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/COX14","classification":"Not Classified","n_dependent_lines":104,"n_total_lines":1208,"dependency_fraction":0.08609271523178808},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/COX14","total_profiled":1310},"omim":[{"mim_id":"619059","title":"MITOCHONDRIAL COMPLEX IV DEFICIENCY, NUCLEAR TYPE 15; MC4DN15","url":"https://www.omim.org/entry/619059"},{"mim_id":"619058","title":"MITOCHONDRIAL COMPLEX IV DEFICIENCY, NUCLEAR TYPE 14; MC4DN14","url":"https://www.omim.org/entry/619058"},{"mim_id":"619053","title":"MITOCHONDRIAL COMPLEX IV DEFICIENCY, NUCLEAR TYPE 10; MC4DN10","url":"https://www.omim.org/entry/619053"},{"mim_id":"614775","title":"CYTOCHROME C OXIDASE ASSEMBLY FACTOR 3; COA3","url":"https://www.omim.org/entry/614775"},{"mim_id":"614774","title":"PENTATRICOPEPTIDE REPEAT DOMAIN-CONTAINING PROTEIN 1; PTCD1","url":"https://www.omim.org/entry/614774"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Mitochondria","reliability":"Supported"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/COX14"},"hgnc":{"alias_symbol":["MGC14288"],"prev_symbol":["C12orf62"]},"alphafold":{"accession":"Q96I36","domains":[{"cath_id":"1.20.5","chopping":"29-57","consensus_level":"medium","plddt":82.2531,"start":29,"end":57}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96I36","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q96I36-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q96I36-F1-predicted_aligned_error_v6.png","plddt_mean":85.69},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=COX14","jax_strain_url":"https://www.jax.org/strain/search?query=COX14"},"sequence":{"accession":"Q96I36","fasta_url":"https://rest.uniprot.org/uniprotkb/Q96I36.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q96I36/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96I36"}},"corpus_meta":[{"pmid":"15306853","id":"PMC_15306853","title":"Mss51p and Cox14p jointly regulate mitochondrial Cox1p expression in Saccharomyces cerevisiae.","date":"2004","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/15306853","citation_count":181,"is_preprint":false},{"pmid":"27693358","id":"PMC_27693358","title":"Mitochondrial Protein Synthesis Adapts to Influx of Nuclear-Encoded Protein.","date":"2016","source":"Cell","url":"https://pubmed.ncbi.nlm.nih.gov/27693358","citation_count":178,"is_preprint":false},{"pmid":"17882259","id":"PMC_17882259","title":"Shy1 couples Cox1 translational regulation to cytochrome c oxidase assembly.","date":"2007","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/17882259","citation_count":114,"is_preprint":false},{"pmid":"20876281","id":"PMC_20876281","title":"Coa3 and Cox14 are essential for negative feedback regulation of COX1 translation in mitochondria.","date":"2010","source":"The Journal of cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/20876281","citation_count":104,"is_preprint":false},{"pmid":"22243966","id":"PMC_22243966","title":"Mutations in C12orf62, a factor that couples COX I synthesis with cytochrome c oxidase assembly, cause fatal neonatal lactic acidosis.","date":"2012","source":"American journal of human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/22243966","citation_count":83,"is_preprint":false},{"pmid":"22356826","id":"PMC_22356826","title":"Iterative orthology prediction uncovers new mitochondrial proteins and identifies C12orf62 as the human ortholog of COX14, a protein involved in the assembly of cytochrome c oxidase.","date":"2012","source":"Genome biology","url":"https://pubmed.ncbi.nlm.nih.gov/22356826","citation_count":80,"is_preprint":false},{"pmid":"19710419","id":"PMC_19710419","title":"Dual functions of Mss51 couple synthesis of Cox1 to assembly of cytochrome c oxidase in Saccharomyces cerevisiae mitochondria.","date":"2009","source":"Molecular biology of the cell","url":"https://pubmed.ncbi.nlm.nih.gov/19710419","citation_count":79,"is_preprint":false},{"pmid":"21068384","id":"PMC_21068384","title":"Cox25 teams up with Mss51, Ssc1, and Cox14 to regulate mitochondrial cytochrome c oxidase subunit 1 expression and assembly in Saccharomyces cerevisiae.","date":"2010","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/21068384","citation_count":68,"is_preprint":false},{"pmid":"7797555","id":"PMC_7797555","title":"Cloning and characterization of COX14, whose product is required for assembly of yeast cytochrome oxidase.","date":"1995","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/7797555","citation_count":68,"is_preprint":false},{"pmid":"28082314","id":"PMC_28082314","title":"A CMC1-knockout reveals translation-independent control of human mitochondrial complex IV biogenesis.","date":"2017","source":"EMBO reports","url":"https://pubmed.ncbi.nlm.nih.gov/28082314","citation_count":64,"is_preprint":false},{"pmid":"25604084","id":"PMC_25604084","title":"Mutations in COA3 cause isolated complex IV deficiency associated with neuropathy, exercise intolerance, obesity, and short stature.","date":"2015","source":"Journal of medical genetics","url":"https://pubmed.ncbi.nlm.nih.gov/25604084","citation_count":51,"is_preprint":false},{"pmid":"17135289","id":"PMC_17135289","title":"Aberrant translation of cytochrome c oxidase subunit 1 mRNA species in the absence of Mss51p in the yeast Saccharomyces cerevisiae.","date":"2006","source":"Molecular biology of the cell","url":"https://pubmed.ncbi.nlm.nih.gov/17135289","citation_count":49,"is_preprint":false},{"pmid":"20807763","id":"PMC_20807763","title":"The carboxyl-terminal end of Cox1 is required for feedback assembly regulation of Cox1 synthesis in Saccharomyces cerevisiae mitochondria.","date":"2010","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/20807763","citation_count":34,"is_preprint":false},{"pmid":"28931599","id":"PMC_28931599","title":"MrpL35, a mitospecific component of mitoribosomes, plays a key role in cytochrome c oxidase assembly.","date":"2017","source":"Molecular biology of the cell","url":"https://pubmed.ncbi.nlm.nih.gov/28931599","citation_count":32,"is_preprint":false},{"pmid":"28490636","id":"PMC_28490636","title":"The Cox1 C-terminal domain is a central regulator of cytochrome c oxidase biogenesis in yeast mitochondria.","date":"2017","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/28490636","citation_count":28,"is_preprint":false},{"pmid":"16339141","id":"PMC_16339141","title":"COX24 codes for a mitochondrial protein required for processing of the COX1 transcript.","date":"2005","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/16339141","citation_count":22,"is_preprint":false},{"pmid":"39134548","id":"PMC_39134548","title":"Defective mitochondrial COX1 translation due to loss of COX14 function triggers ROS-induced inflammation in mouse liver.","date":"2024","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/39134548","citation_count":17,"is_preprint":false},{"pmid":"26929411","id":"PMC_26929411","title":"A Novel Function of Pet54 in Regulation of Cox1 Synthesis in Saccharomyces cerevisiae Mitochondria.","date":"2016","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/26929411","citation_count":17,"is_preprint":false},{"pmid":"19348890","id":"PMC_19348890","title":"Chapter 11 Supercomplex organization of the yeast respiratory chain complexes and the ADP/ATP carrier proteins.","date":"2009","source":"Methods in enzymology","url":"https://pubmed.ncbi.nlm.nih.gov/19348890","citation_count":11,"is_preprint":false},{"pmid":"28357365","id":"PMC_28357365","title":"Cox1 mutation abrogates need for Cox23 in cytochrome c oxidase biogenesis.","date":"2016","source":"Microbial cell (Graz, Austria)","url":"https://pubmed.ncbi.nlm.nih.gov/28357365","citation_count":8,"is_preprint":false},{"pmid":"35779633","id":"PMC_35779633","title":"Overexpression of MRX9 impairs processing of RNAs encoding mitochondrial oxidative phosphorylation factors COB and COX1 in yeast.","date":"2022","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/35779633","citation_count":5,"is_preprint":false},{"pmid":"38928699","id":"PMC_38928699","title":"A Machine Learning Model for the Prediction of COVID-19 Severity Using RNA-Seq, Clinical, and Co-Morbidity Data.","date":"2024","source":"Diagnostics (Basel, Switzerland)","url":"https://pubmed.ncbi.nlm.nih.gov/38928699","citation_count":5,"is_preprint":false},{"pmid":"12366840","id":"PMC_12366840","title":"Suppression of a nuclear frameshift mutation by a mitochondrial tRNA in the yeast Kluyveromyces lactis.","date":"2002","source":"Molecular microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/12366840","citation_count":3,"is_preprint":false},{"pmid":"34515013","id":"PMC_34515013","title":"Inactivation of PDH can Reduce Anaplastic Thyroid Cancer Cells' Sensitivity to Artemisinin.","date":"2022","source":"Anti-cancer agents in medicinal chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/34515013","citation_count":2,"is_preprint":false},{"pmid":"41683958","id":"PMC_41683958","title":"Multi-Omics Analysis of a Spontaneous Type 2 Diabetes Model in Myodes rufocanus and Its Underlying Mechanisms.","date":"2026","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/41683958","citation_count":0,"is_preprint":false},{"pmid":"42038475","id":"PMC_42038475","title":"Multi-omics analysis reveals key genes associated with clear cell renal cell carcinoma.","date":"2026","source":"PeerJ","url":"https://pubmed.ncbi.nlm.nih.gov/42038475","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":14073,"output_tokens":3738,"usd":0.049145,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":11529,"output_tokens":3570,"usd":0.073447,"stage2_stop_reason":"end_turn"},"total_usd":0.122592,"stage1_batch_id":"msgbatch_01ACAxJQabDsht39JXeWG22d","stage2_batch_id":"msgbatch_01QEU22A9U5sbPTgsMzTmvSf","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1995,\n      \"finding\": \"COX14 encodes a low molecular mass protein (~8 kDa) required for cytochrome c oxidase assembly in yeast. Cox14p localizes to the mitochondrial membrane and is associated with a high molecular weight complex, but is not a subunit of cytochrome oxidase itself. cox14 null mutants lack COX activity despite normal synthesis of mitochondrially encoded Cox1, Cox2, and Cox3 subunits, indicating a post-translational assembly role.\",\n      \"method\": \"Complementation cloning, Western analysis, biotinylated gene fusion localization, native complex analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (complementation, Western, localization, assembly analysis) in the founding paper; replicated by subsequent studies\",\n      \"pmids\": [\"7797555\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Cox14p and Mss51p interact with each other and with newly synthesized Cox1p to form a transient Cox14p-Cox1p-Mss51p complex. This complex functions to downregulate Cox1p synthesis (negative feedback). Deletion of COX14 does not affect Cox1p synthesis even when other COX assembly genes are mutated, unlike most assembly mutants, because Cox14p is required to sequester Mss51p.\",\n      \"method\": \"Co-immunoprecipitation, pulse-labeling of mitochondrial translation products, epistasis analysis with mss51 suppressor mutations\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP and pulse-labeling in same study; independently replicated by multiple labs\",\n      \"pmids\": [\"15306853\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Shy1 (yeast SURF1 ortholog) interacts with Mss51 and Cox14, linking translational regulation of Cox1 to complex IV assembly. Cox14-containing partially assembled complex IV intermediates bound to Shy1 can associate with the bc1 complex to form transitional supercomplexes.\",\n      \"method\": \"Co-immunoprecipitation, blue-native PAGE, identification of assembly intermediates\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP and BN-PAGE, replicated by multiple labs\",\n      \"pmids\": [\"17882259\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Mss51 does not stably interact with newly synthesized Cox1 in cox14 mutants, demonstrating that Cox14 is required for Mss51 sequestration into early Cox1 assembly intermediates. The physical interaction between Mss51 and Cox14 is dependent upon Cox1 synthesis, indicating dynamic assembly of early cytochrome c oxidase intermediates nucleated by Cox1.\",\n      \"method\": \"Co-immunoprecipitation, pulse-labeling, reporter gene assays in yeast\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP with pulse-labeling, replicated across labs\",\n      \"pmids\": [\"19710419\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Coa3 and Cox14 together form assembly intermediates with newly synthesized Cox1 and are both required for Mss51 association with these complexes. Coa3 and Cox14 promote formation of the latent (translational resting) state of Mss51 and thus downregulate COX1 expression. Lack of either Coa3 or Cox14 traps Mss51 in the committed (translation-effective) state. Coa1 binding to sequestered Mss51 in complex with Cox14, Coa3, and Cox1 is essential for full Mss51 inactivation.\",\n      \"method\": \"Co-immunoprecipitation, pulse-labeling, sucrose gradient sedimentation, yeast genetics\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods, replicated by independent labs\",\n      \"pmids\": [\"20876281\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Cox14 is an essential component of complexes containing newly synthesized Cox1, Ssc1, and Mss51 in yeast. Cox25 interacts with Cox14 in these complexes. After Ssc1-Mss51 release, Cox25 continues to interact with Cox14 and Cox1 to facilitate formation of multisubunit COX assembly intermediates.\",\n      \"method\": \"Co-immunoprecipitation, pulse-labeling, genetic analysis in S. cerevisiae\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP and pulse-labeling, consistent with multiple prior studies\",\n      \"pmids\": [\"21068384\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Deletion of the C-terminal 11 or 15 residues of Cox1 eliminates the assembly-feedback control of Cox1 synthesis and reduces the strength of the Mss51-Cox14 interaction, confirming that the Cox1 C-terminal residues are required for Mss51 sequestration via Cox14.\",\n      \"method\": \"Site-directed mutagenesis of mitochondrial DNA, co-immunoprecipitation, pulse-labeling\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — mutagenesis combined with Co-IP and pulse-labeling, single lab with multiple methods\",\n      \"pmids\": [\"20807763\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"C12orf62 (human ortholog of yeast COX14) is a small (~6 kDa) single-transmembrane protein that localizes to mitochondria and elutes in a complex of ~110 kDa. It is required for coupling COX I synthesis with cytochrome c oxidase assembly in humans. A missense mutation (c.88G>A) causes fatal neonatal lactic acidosis with COX assembly defect and specific decrease in COX I synthesis. COX I, II, and IV co-immunoprecipitated with epitope-tagged C12orf62. siRNA knockdown recapitulates the biochemical defect; retroviral expression of wild-type C12orf62 rescues it.\",\n      \"method\": \"Patient genetics, microcell-mediated chromosome transfer, retroviral complementation, siRNA knockdown, co-immunoprecipitation, BN-2D-PAGE, pulse-labeling\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (rescue, siRNA, Co-IP, pulse-labeling), patient-derived cells\",\n      \"pmids\": [\"22243966\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"C12orf62 is confirmed as the human ortholog of yeast COX14 by iterative orthology prediction (Ortho-Profile). Its role in negative regulation of COX I translation and COX assembly was experimentally verified via co-expression patterns, subcellular localization, and co-purification with human COX-associated proteins.\",\n      \"method\": \"Computational orthology prediction validated by experimental localization and co-purification\",\n      \"journal\": \"Genome biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — orthology supported by localization and co-purification, but experimental validation is limited in scope\",\n      \"pmids\": [\"22356826\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"COX14 and COA3 are interdependent for stability: COX14 protein is undetectable in COA3-deficient fibroblasts, and COA3 is undetectable in COX14-deficient fibroblasts. Both exist in an early COX assembly complex containing COX1, coupling COX1 synthesis with holoenzyme assembly.\",\n      \"method\": \"Immunoblot analysis of patient fibroblasts, BN-PAGE, retroviral complementation, pulse-labeling\",\n      \"journal\": \"Journal of medical genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — patient fibroblasts with rescue experiments and multiple methods; complements prior yeast data\",\n      \"pmids\": [\"25604084\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Human mitochondrial ribosomes translating COX1 mRNA selectively engage with cytochrome c oxidase assembly factors (including COX14/C12orf62) in the inner membrane. Assembly defects arrest mitochondrial translation in a ribosome nascent chain complex with a partially membrane-inserted COX1 translation product, representing a primed state. This establishes a mammalian translational plasticity pathway whereby COX14 participates in coupling COX1 synthesis to assembly.\",\n      \"method\": \"Ribosome nascent chain complex isolation, mass spectrometry, sucrose gradient sedimentation, BN-PAGE\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ribosome nascent chain complex biochemistry with MS, multiple orthogonal methods\",\n      \"pmids\": [\"27693358\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"CMC1 forms an early CIV assembly intermediate with COX1 and two assembly factors, COA3 and COX14. CMC1 stabilizes a COX1-COA3-COX14 complex before incorporation of COX4 and COX5a. Whereas COX14 and COA3 have been proposed to affect COX1 mRNA translation, CMC1 regulates turnover of newly synthesized COX1 without affecting the rate of COX1 synthesis.\",\n      \"method\": \"TALEN-mediated CMC1 knockout, BN-PAGE, co-immunoprecipitation, pulse-labeling, immunoblot\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — KO cell line with multiple orthogonal methods, direct mechanistic dissection of complex membership\",\n      \"pmids\": [\"28082314\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Cox1 C-terminal mutations (P521A/P522A and V524E) reduce binding of both Mss51 and Cox14 to COA complexes, enriching Mss51 in a translationally active form that maintains full Cox1 synthesis even when CcO assembly is blocked. This confirms that the Cox1 C-terminal end is a key structural determinant for Cox14-mediated sequestration of Mss51.\",\n      \"method\": \"Site-directed mutagenesis of mitochondrial COX1 gene, co-immunoprecipitation, pulse-labeling, BN-PAGE\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — mutagenesis combined with Co-IP, pulse-labeling, and BN-PAGE; single lab with multiple orthogonal methods\",\n      \"pmids\": [\"28490636\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"MrpL35 (a mitospecific component of the yeast mitoribosomal central protuberance) coordinates Cox1 synthesis with COX assembly in a manner that involves Cox14 and Coa3 proteins. mrpL35 mutants show COX assembly defects rather than a global inhibition of mitochondrial protein synthesis.\",\n      \"method\": \"Yeast genetics, co-immunoprecipitation, pulse-labeling\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — genetic and biochemical evidence for Cox14 involvement, but Cox14's specific role is inferred from the context rather than directly tested\",\n      \"pmids\": [\"28931599\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"In a COX14 mutant mouse (COX14M19I) corresponding to a patient with complex IV deficiency, loss of COX14 function impairs COX1 translation, causing complex IV deficiency. This triggers increased reactive oxygen species production, which leads to release of mitochondrial RNA into the cytosol, sensed by the RIG-1 pathway, causing severe liver inflammation. A COA3Y72C mouse (affecting a cooperating assembly factor) displays a similar but milder inflammatory phenotype.\",\n      \"method\": \"Mouse knockout/knockin model, pulse-labeling of mitochondrial translation, ROS measurement, cytosolic RNA detection, pathway analysis\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — mouse genetic model with multiple orthogonal readouts establishing mechanism from COX14 loss to inflammation via ROS-mtRNA-RIG-1 pathway\",\n      \"pmids\": [\"39134548\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"COX14 (C12orf62 in humans) encodes a small single-transmembrane mitochondrial inner membrane protein that is essential for cytochrome c oxidase (complex IV) biogenesis: it forms an early assembly intermediate complex with newly synthesized COX1, COA3, and the translational activator Mss51 (in yeast), thereby coupling COX1 mRNA translation to holoenzyme assembly via a negative feedback loop in which Mss51 is sequestered in the COX1-COX14-COA3 complex when assembly is blocked; in humans, COX14/C12orf62 similarly couples COX1 synthesis to COX assembly, and its loss causes COX1 translation defects, complex IV deficiency, ROS-induced mitochondrial RNA release, and tissue-specific inflammation via the RIG-1 innate immune pathway.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"COX14 encodes a small single-transmembrane mitochondrial inner-membrane protein that is essential for biogenesis of cytochrome c oxidase (complex IV) but is not itself a structural subunit of the holoenzyme [#0, #7]. Its central function is to couple translation of the mitochondrially encoded COX1 subunit to downstream assembly: COX14 forms an early assembly intermediate nucleated by newly synthesized COX1, and in yeast this complex sequesters the translational activator Mss51 into its latent, translation-resting state, thereby imposing a negative feedback loop that downregulates COX1 synthesis when assembly stalls [#1, #3, #4]. Mss51 sequestration requires the C-terminal residues of COX1 and the cooperating factors Coa3/COA3 and Coa1, with which COX14 acts interdependently — COX14 and COA3 are mutually required for each other's stability and reside together in the COX1-containing early intermediate [#4, #6, #9]. This assembly intermediate is handed forward through additional factors including Shy1 (SURF1), Cox25, and CMC1 before incorporation of later COX subunits, and at the ribosome level COX14 engages COX1-translating mitoribosomes to enforce a primed translational state when assembly is blocked [#2, #5, #10, #11]. In humans, the COX14 ortholog C12orf62 performs the analogous coupling role, and its loss causes a specific defect in COX1 synthesis with complex IV deficiency [#7, #9]; a missense mutation causes fatal neonatal lactic acidosis [#7]. In a corresponding mouse model, COX14 dysfunction triggers excess reactive oxygen species, release of mitochondrial RNA to the cytosol, and RIG-I–mediated inflammation, linking defective complex IV assembly to innate immune activation [#14].\",\n  \"teleology\": [\n    {\n      \"year\": 1995,\n      \"claim\": \"Established that COX14 is required for complex IV assembly without being a subunit, distinguishing it as a dedicated assembly factor rather than a structural component.\",\n      \"evidence\": \"Complementation cloning, Western analysis, and native complex analysis in yeast showing loss of COX activity despite normal Cox1/Cox2/Cox3 synthesis\",\n      \"pmids\": [\"7797555\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular partners and the step of assembly affected were undefined\", \"Mechanism of post-translational action unknown\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Identified COX14 as the factor that physically links the translational activator Mss51 to newly made Cox1, defining a negative feedback loop coupling COX1 synthesis to assembly.\",\n      \"evidence\": \"Reciprocal Co-IP, pulse-labeling of mitochondrial translation, and epistasis with mss51 suppressors in yeast\",\n      \"pmids\": [\"15306853\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether additional factors are needed to form the latent Mss51 state was unresolved\", \"Structural basis of the COX14-Mss51-Cox1 interaction unknown\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Connected the COX14-Mss51 translational module to the downstream assembly pathway via Shy1/SURF1 and to supercomplex formation.\",\n      \"evidence\": \"Co-IP and blue-native PAGE identifying COX14-containing intermediates bound to Shy1 and the bc1 complex\",\n      \"pmids\": [\"17882259\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Order of handoff between intermediates not fully defined\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Demonstrated that COX14 is required for Mss51 sequestration and that this interaction depends on active Cox1 synthesis, establishing Cox1 as the nucleating subunit of the early intermediate.\",\n      \"evidence\": \"Co-IP, pulse-labeling, and reporter assays in cox14 mutant yeast\",\n      \"pmids\": [\"19710419\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether other factors stabilize the intermediate was not yet defined\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Resolved the multi-factor composition controlling Mss51 state, showing Coa3, Cox14, and Coa1 together drive the latent (translation-resting) form, and identified Cox25 as a continuing partner after Mss51 release.\",\n      \"evidence\": \"Co-IP, pulse-labeling, sucrose gradient sedimentation, and yeast genetics across multiple studies\",\n      \"pmids\": [\"20876281\", \"21068384\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry and structural arrangement of the intermediate unresolved\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Mapped the Cox1 C-terminal residues as the structural determinant required for Mss51 sequestration via COX14, providing a molecular handle for the feedback control.\",\n      \"evidence\": \"Mitochondrial DNA mutagenesis with Co-IP and pulse-labeling in yeast\",\n      \"pmids\": [\"20807763\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct contact between Cox1 C-terminus and COX14 not structurally demonstrated\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Extended the model to humans, identifying C12orf62/COX14 as the ortholog coupling COX1 synthesis to assembly and linking its mutation to fatal mitochondrial disease.\",\n      \"evidence\": \"Patient genetics, retroviral complementation rescue, siRNA knockdown, Co-IP, BN-PAGE, and pulse-labeling; orthology prediction validated by localization and co-purification\",\n      \"pmids\": [\"22243966\", \"22356826\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Human-specific partners beyond COX subunits not fully enumerated\", \"Whether human COX14 regulates an Mss51-equivalent activator was unaddressed\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Established the mutual stability dependence of COX14 and COA3 in human cells, defining them as an obligate module within the early COX1 intermediate.\",\n      \"evidence\": \"Immunoblot of patient fibroblasts, BN-PAGE, retroviral complementation, pulse-labeling\",\n      \"pmids\": [\"25604084\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Biochemical basis of the co-stabilization unknown\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Showed that COX14 acts at the level of translating mitoribosomes, engaging COX1-synthesizing ribosome nascent chain complexes to enforce a primed translational state under assembly stress.\",\n      \"evidence\": \"Ribosome nascent chain complex isolation, mass spectrometry, sucrose gradient sedimentation, BN-PAGE in human cells\",\n      \"pmids\": [\"27693358\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Precise contacts between COX14 and the mitoribosome unresolved\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Dissected division of labor within the early intermediate, distinguishing COX14/COA3 (proposed translational control) from CMC1 (regulation of COX1 turnover) and confirming the Cox1 C-terminus requirement, refining the composition and function of the COX1 assembly hub.\",\n      \"evidence\": \"CMC1 knockout cells, mitochondrial COX1 mutagenesis, Co-IP, BN-PAGE, pulse-labeling; yeast genetics with MrpL35\",\n      \"pmids\": [\"28082314\", \"28490636\", \"28931599\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanistic coupling between the mitoribosome and the intermediate only partly defined\", \"MrpL35 step relies on inferred COX14 involvement\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Connected COX14 loss to a downstream pathophysiological cascade in vivo, showing impaired COX1 translation drives ROS, mitochondrial RNA release, and RIG-I–mediated inflammation.\",\n      \"evidence\": \"COX14 M19I knockin mouse with pulse-labeling, ROS measurement, cytosolic RNA detection, and pathway analysis\",\n      \"pmids\": [\"39134548\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Tissue specificity of the inflammatory response not fully explained\", \"Direct route from ROS to mtRNA release not mechanistically resolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the human COX14 module senses assembly status and feeds back on COX1 translation at structural resolution, and whether a human Mss51-equivalent activator exists, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No atomic structure of the COX1-COX14-COA3 intermediate\", \"Human translational activator analogous to yeast Mss51 not identified\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0045182\", \"supporting_discovery_ids\": [1, 3, 4, 7, 10]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [1, 4]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005743\", \"supporting_discovery_ids\": [0, 7]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [0, 7]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [0, 7, 9, 11]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [1, 3, 10]}\n    ],\n    \"complexes\": [\n      \"COX1-COX14-COA3 early complex IV assembly intermediate\"\n    ],\n    \"partners\": [\n      \"COX1\",\n      \"COA3\",\n      \"MSS51\",\n      \"SHY1\",\n      \"COA1\",\n      \"CMC1\",\n      \"COX25\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}