{"gene":"TIMMDC1","run_date":"2026-04-28T21:42:59","timeline":{"discoveries":[{"year":2013,"finding":"TIMMDC1 (C3orf1) is a membrane-embedded mitochondrial complex I assembly factor that localizes to the mitochondrial inner membrane, physically associates with multiple members of the MCIA complex (ACAD9, ECSIT, NDUFAF1, TMEM126B) and core complex I subunits, and its depletion results in reduced complex I activity and cellular respiration. Quantitative proteomics demonstrated a role for TIMMDC1 in assembly of both membrane-embedded and soluble arms of complex I.","method":"Interaction proteomics (AP-MS), reciprocal co-immunoprecipitation, subcellular fractionation/localization, siRNA knockdown with complex I activity assay and cellular respiration measurement, quantitative proteomics","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP, MS interactome, clean KD with defined biochemical phenotype, multiple orthogonal methods in one study","pmids":["24344204"],"is_preprint":false},{"year":2013,"finding":"TIMMDC1 (C3orf1) is associated with subcomplexes of complex I (550 kDa and 815 kDa) that accumulate when NDUFA11 expression is suppressed, identifying it as one of several extrinsic assembly factors participating in constructing the membrane arm of complex I.","method":"Blue-native PAGE of subcomplexes after siRNA suppression of NDUFA11, mass spectrometry identification of subcomplex components","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — clean KD with defined biochemical phenotype and MS identification, replicated by independent lab","pmids":["24191001"],"is_preprint":false},{"year":2021,"finding":"C9orf72 directly stabilizes TIMMDC1 protein in the mitochondrial inner membrane by recruiting the prohibitin complex to inhibit m-AAA protease-dependent degradation of TIMMDC1, thereby maintaining complex I assembly and oxidative phosphorylation.","method":"Co-immunoprecipitation, proximity ligation, siRNA/knockout cell lines, protease inhibitor experiments, complex I activity assays, patient-derived neuron analysis","journal":"Cell metabolism","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP identifying the C9orf72/prohibitin/m-AAA protease/TIMMDC1 axis, multiple orthogonal methods, replicated in patient neurons","pmids":["33545050"],"is_preprint":false},{"year":2017,"finding":"A deep intronic variant in TIMMDC1 (c.597-1340A>G) causes aberrant splicing with inclusion of a cryptic exon, leading to loss of TIMMDC1 protein and mitochondrial complex I deficiency, establishing TIMMDC1 as a disease-associated complex I assembly factor.","method":"RNA sequencing, aberrant splicing analysis, protein analysis in patient-derived fibroblasts","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 — RNA-seq and protein analysis in patient fibroblasts, single lab but mechanistically defined","pmids":["28604674"],"is_preprint":false},{"year":2022,"finding":"Splice-switching antisense oligonucleotides (SSOs) targeting the deep intronic TIMMDC1 variant c.597-1340A>G restore normal TIMMDC1 mRNA processing and protein levels in patient fibroblasts, rescuing complex I subunit abundance and mitochondrial function as confirmed by quantitative proteomics and real-time metabolic analysis.","method":"Antisense oligonucleotide treatment, RNA analysis, quantitative proteomics, real-time mitochondrial metabolic analysis in patient fibroblasts","journal":"NPJ genomic medicine","confidence":"High","confidence_rationale":"Tier 1 — functional rescue experiment with quantitative proteomics and metabolic readouts confirming mechanism","pmids":["35091571"],"is_preprint":false},{"year":2021,"finding":"TIMMDC1 is destabilized in complex I assembly intermediates when either NDUFAF3 or NDUFAF4 is disrupted in Drosophila, placing TIMMDC1 downstream of these assembly factors in the complex I biogenesis pathway, specifically in Q-, N-, and PP-b-module assembly.","method":"Genetic epistasis analysis in Drosophila, blue-native PAGE, immunoblotting of assembly intermediates","journal":"iScience","confidence":"Medium","confidence_rationale":"Tier 2 — genetic epistasis in Drosophila ortholog system with clear biochemical readout","pmids":["34386730"],"is_preprint":false},{"year":2019,"finding":"TIMMDC1 is a direct target of miR-450a as identified by AGO-PAR-CLIP combined with RNA-seq, placing TIMMDC1 within a set of mitochondrial energy metabolism genes regulated post-transcriptionally in ovarian cancer cells.","method":"AGO-PAR-CLIP, RNA-seq, miRNA overexpression with target validation","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 — direct AGO-PAR-CLIP binding evidence combined with transcriptomic readout","pmids":["31101765"],"is_preprint":false},{"year":2019,"finding":"TIMMDC1 C-terminal truncation (p.Arg225*) acts as a hypomorphic variant that still allows partial complex I assembly rescue in TIMMDC1 knockout cells, demonstrating that the C-terminus of TIMMDC1 is not absolutely required for its assembly factor function.","method":"TIMMDC1 knockout cell complementation assay, complex I activity measurement, protein analysis","journal":"Human mutation","confidence":"Medium","confidence_rationale":"Tier 2 — knockout rescue experiment with direct functional readout","pmids":["30981218"],"is_preprint":false},{"year":2018,"finding":"TIMMDC1 knockdown in gastric cancer cells selectively reduces mitochondrial complex I activity (but not complexes II–IV), inhibits mitochondrial respiration and glycolysis, reduces ATP production, and decreases phosphorylation of AKT (Ser473) and GSK-3β (Ser9) with downstream reduction of β-catenin and c-Myc.","method":"siRNA knockdown, Seahorse mitochondrial respiration assay, complex activity assays, western blotting, in vivo xenograft","journal":"International journal of biological sciences","confidence":"Medium","confidence_rationale":"Tier 2 — clean KD with defined biochemical phenotype (complex I specificity) and signaling pathway placement","pmids":["30123074"],"is_preprint":false},{"year":2014,"finding":"TIMMDC1 (C3orf1) localizes to the mitochondrial inner membrane and its depletion in 95D lung carcinoma cells reduces mitochondrial viability, membrane potential, and ATPase activity, inhibiting cell growth and migration with upregulation of cell-cycle arrest genes (CCNG2, PTEN) and migration-inhibiting genes (TIMP3, COL3A1) and downregulation of NUPR1.","method":"siRNA knockdown, mitochondrial localization confirmation, mitochondrial membrane potential assay, ATPase activity assay, microarray gene expression analysis, cell migration and proliferation assays","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2 — direct localization experiment with functional consequence, clean KD with defined phenotypic readouts","pmids":["25391042"],"is_preprint":false},{"year":2025,"finding":"METTL3 methyltransferase suppresses TIMMDC1 expression via m6A methylation of TIMMDC1 mRNA, as confirmed by Me-RIP assay and RIP showing METTL3-TIMMDC1 mRNA interaction, thereby inhibiting PDGF-BB-induced airway smooth muscle cell proliferation, migration, and M2 macrophage polarization.","method":"Me-RIP assay, RIP assay, METTL3 knockdown/overexpression, TIMMDC1 knockdown/overexpression, cell proliferation and migration assays, flow cytometry","journal":"Immunobiology","confidence":"Medium","confidence_rationale":"Tier 2 — direct Me-RIP evidence of m6A modification with functional rescue experiments","pmids":["40409178"],"is_preprint":false},{"year":2016,"finding":"TIMMDC1 (TMEM126B complex member) is identified as a component of the MCIA complex (alongside ACAD9, ECSIT, NDUFAF1, TMEM126B) by complexome profiling, and TMEM126B loss disrupts MCIA complex integrity and complex I assembly.","method":"Complexome profiling, viral rescue in patient cell lines","journal":"American journal of human genetics","confidence":"Medium","confidence_rationale":"Tier 2 — complexome profiling provides direct physical association evidence in a defined complex","pmids":["27374774"],"is_preprint":false}],"current_model":"TIMMDC1 is a 4-pass membrane protein embedded in the mitochondrial inner membrane that functions as an assembly factor for the membrane arm of respiratory complex I by associating with the MCIA complex (ACAD9, ECSIT, NDUFAF1, TMEM126B) and core complex I subunits; its protein stability is maintained by C9orf72-recruited prohibitin complex that prevents m-AAA protease-dependent degradation, and its loss — whether through genetic variants, siRNA depletion, or miR-450a targeting — selectively abolishes complex I activity, impairs oxidative phosphorylation and ATP production, and reduces downstream AKT/GSK-3β/β-catenin signaling."},"narrative":{"teleology":[{"year":2013,"claim":"Establishing TIMMDC1 as a complex I assembly factor resolved its unknown mitochondrial function by showing it physically engages the MCIA complex and core complex I subunits, and that its depletion reduces complex I activity and cellular respiration.","evidence":"AP-MS, reciprocal co-IP, siRNA knockdown with complex I activity assays and respiration measurement in human cells; independently, BN-PAGE/MS identification of TIMMDC1 on 550/815 kDa complex I subcomplexes","pmids":["24344204","24191001"],"confidence":"High","gaps":["Precise step in the complex I assembly pathway at which TIMMDC1 acts was not defined","Topology and transmembrane domain contributions to function were not characterized","No structural model of TIMMDC1 within the MCIA complex"]},{"year":2016,"claim":"Complexome profiling confirmed TIMMDC1 as a stable MCIA complex component, anchoring it alongside ACAD9, ECSIT, NDUFAF1, and TMEM126B in the complex I assembly pathway.","evidence":"Complexome profiling and viral rescue in patient cell lines","pmids":["27374774"],"confidence":"Medium","gaps":["Stoichiometry and direct contact partners within the MCIA complex not resolved","Whether TIMMDC1 loss destabilizes the entire MCIA complex or only selected subunits was not tested"]},{"year":2017,"claim":"Discovery of a deep intronic TIMMDC1 variant causing aberrant splicing and complex I deficiency established TIMMDC1 as a Mendelian disease gene, linking its loss of function to human mitochondrial disease.","evidence":"RNA-seq and protein analysis in patient-derived fibroblasts carrying c.597-1340A>G","pmids":["28604674"],"confidence":"Medium","gaps":["Single family report; genetic confirmation in additional kindreds was lacking","Clinical spectrum and genotype–phenotype correlations were not fully defined"]},{"year":2018,"claim":"Demonstrating that TIMMDC1 knockdown selectively impairs complex I (not II–IV), suppresses respiration and glycolysis, and reduces AKT/GSK-3β/β-catenin signaling linked TIMMDC1-dependent bioenergetics to downstream oncogenic signaling.","evidence":"siRNA knockdown in gastric cancer cells, Seahorse metabolic analysis, complex activity assays, western blotting, in vivo xenograft","pmids":["30123074"],"confidence":"Medium","gaps":["Whether AKT pathway effects are a direct consequence of reduced ATP or a parallel TIMMDC1 function is unresolved","Cancer context generalizability beyond gastric cancer not tested"]},{"year":2019,"claim":"Identifying miR-450a as a direct post-transcriptional repressor of TIMMDC1 and showing that a C-terminal truncation (p.Arg225*) retains partial assembly function defined regulatory and structural boundaries of TIMMDC1 activity.","evidence":"AGO-PAR-CLIP and RNA-seq in ovarian cancer cells; TIMMDC1-KO complementation assay with truncation mutant","pmids":["31101765","30981218"],"confidence":"Medium","gaps":["Physiological relevance of miR-450a regulation of TIMMDC1 outside cancer context unknown","Minimal functional domain of TIMMDC1 not mapped"]},{"year":2021,"claim":"Revealing that C9orf72 recruits the prohibitin complex to shield TIMMDC1 from m-AAA protease degradation uncovered a dedicated protein quality-control mechanism governing complex I assembly factor stability.","evidence":"Co-IP, proximity ligation, KO cell lines, protease inhibitor experiments, complex I assays, patient-derived neuron analysis","pmids":["33545050"],"confidence":"High","gaps":["Whether this protective mechanism operates on other MCIA subunits was not addressed","Structural basis of the C9orf72–prohibitin–TIMMDC1 interaction is unknown"]},{"year":2021,"claim":"Genetic epistasis in Drosophila placed TIMMDC1 downstream of NDUFAF3/NDUFAF4 in complex I biogenesis, specifying its role in Q-, N-, and PP-b-module assembly steps.","evidence":"Drosophila genetic epistasis, BN-PAGE, immunoblotting of assembly intermediates","pmids":["34386730"],"confidence":"Medium","gaps":["Whether the same epistatic hierarchy holds in mammalian systems is unconfirmed","Mechanism by which NDUFAF3/4 loss destabilizes TIMMDC1 is unclear"]},{"year":2022,"claim":"Splice-switching antisense oligonucleotides correcting the TIMMDC1 intronic variant restored protein levels and mitochondrial function, providing proof-of-concept for therapeutic rescue of TIMMDC1 deficiency.","evidence":"ASO treatment of patient fibroblasts with quantitative proteomics and real-time metabolic analysis","pmids":["35091571"],"confidence":"High","gaps":["In vivo efficacy and delivery to affected tissues (brain, muscle) not demonstrated","Long-term stability of rescue not assessed"]},{"year":2025,"claim":"Demonstrating METTL3-mediated m6A methylation of TIMMDC1 mRNA as a repressive mechanism added an epitranscriptomic layer of TIMMDC1 regulation with consequences for cell proliferation and immune polarization.","evidence":"Me-RIP, RIP, METTL3 knockdown/overexpression with TIMMDC1 rescue in airway smooth muscle cells","pmids":["40409178"],"confidence":"Medium","gaps":["Specific m6A sites on TIMMDC1 mRNA were not mapped","Whether m6A regulation affects TIMMDC1 in non-disease contexts is unknown"]},{"year":null,"claim":"A high-resolution structural model of TIMMDC1 within the MCIA complex and the precise mechanism by which TIMMDC1 facilitates membrane-arm subunit insertion remain unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No cryo-EM or crystal structure of TIMMDC1 alone or in complex","Precise contacts between TIMMDC1 transmembrane domains and complex I subunits unknown","Whether TIMMDC1 has catalytic activity or functions purely as a scaffold is undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,1,11]}],"localization":[{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[0,2,9]}],"pathway":[{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[0,1,8]},{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[0,1,5,11]}],"complexes":["MCIA complex"],"partners":["ACAD9","ECSIT","NDUFAF1","TMEM126B","C9ORF72","METTL3"],"other_free_text":[]},"mechanistic_narrative":"TIMMDC1 is a mitochondrial inner membrane assembly factor essential for biogenesis of the membrane arm of respiratory complex I. It physically associates with the MCIA complex (ACAD9, ECSIT, NDUFAF1, TMEM126B) and core complex I subunits, and its depletion selectively abolishes complex I activity while leaving complexes II–IV intact, thereby impairing oxidative phosphorylation and ATP production [PMID:24344204, PMID:30123074]. TIMMDC1 protein stability is maintained by a C9orf72–prohibitin axis that prevents m-AAA protease-dependent degradation, and its expression is regulated post-transcriptionally by miR-450a and METTL3-mediated m6A methylation [PMID:33545050, PMID:31101765, PMID:40409178]. A deep intronic TIMMDC1 variant (c.597-1340A>G) causes aberrant splicing and loss of protein, resulting in mitochondrial complex I deficiency, a phenotype rescuable by splice-switching antisense oligonucleotides [PMID:28604674, PMID:35091571]."},"prefetch_data":{"uniprot":{"accession":"Q9NPL8","full_name":"Complex I assembly factor TIMMDC1, mitochondrial","aliases":["Protein M5-14","Translocase of inner mitochondrial membrane domain-containing protein 1","TIMM domain containing-protein 1"],"length_aa":285,"mass_kda":32.2,"function":"Chaperone protein involved in the assembly of the mitochondrial NADH:ubiquinone oxidoreductase complex (complex I). Participates in constructing the membrane arm of complex I","subcellular_location":"Mitochondrion membrane","url":"https://www.uniprot.org/uniprotkb/Q9NPL8/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/TIMMDC1","classification":"Not Classified","n_dependent_lines":218,"n_total_lines":1208,"dependency_fraction":0.1804635761589404},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/TIMMDC1","total_profiled":1310},"omim":[{"mim_id":"618251","title":"MITOCHONDRIAL COMPLEX I DEFICIENCY, NUCLEAR TYPE 31; MC1DN31","url":"https://www.omim.org/entry/618251"},{"mim_id":"615534","title":"TRANSLOCASE OF INNER MITOCHONDRIAL MEMBRANE DOMAIN-CONTAINING PROTEIN 1; TIMMDC1","url":"https://www.omim.org/entry/615534"},{"mim_id":"252010","title":"MITOCHONDRIAL COMPLEX I DEFICIENCY, NUCLEAR TYPE 1; MC1DN1","url":"https://www.omim.org/entry/252010"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Enhanced","locations":[{"location":"Mitochondria","reliability":"Enhanced"},{"location":"Nucleoplasm","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/TIMMDC1"},"hgnc":{"alias_symbol":["FLJ22597"],"prev_symbol":["C3orf1"]},"alphafold":{"accession":"Q9NPL8","domains":[{"cath_id":"-","chopping":"57-162","consensus_level":"medium","plddt":81.115,"start":57,"end":162},{"cath_id":"1.10.287","chopping":"163-215","consensus_level":"medium","plddt":79.8553,"start":163,"end":215},{"cath_id":"1.20.5","chopping":"220-257","consensus_level":"medium","plddt":76.8434,"start":220,"end":257}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9NPL8","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9NPL8-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9NPL8-F1-predicted_aligned_error_v6.png","plddt_mean":72.44},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=TIMMDC1","jax_strain_url":"https://www.jax.org/strain/search?query=TIMMDC1"},"sequence":{"accession":"Q9NPL8","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9NPL8.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9NPL8/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9NPL8"}},"corpus_meta":[{"pmid":"28604674","id":"PMC_28604674","title":"Genetic 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Quantitative proteomics demonstrated a role for TIMMDC1 in assembly of both membrane-embedded and soluble arms of complex I.\",\n      \"method\": \"Interaction proteomics (AP-MS), reciprocal co-immunoprecipitation, subcellular fractionation/localization, siRNA knockdown with complex I activity assay and cellular respiration measurement, quantitative proteomics\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP, MS interactome, clean KD with defined biochemical phenotype, multiple orthogonal methods in one study\",\n      \"pmids\": [\"24344204\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"TIMMDC1 (C3orf1) is associated with subcomplexes of complex I (550 kDa and 815 kDa) that accumulate when NDUFA11 expression is suppressed, identifying it as one of several extrinsic assembly factors participating in constructing the membrane arm of complex I.\",\n      \"method\": \"Blue-native PAGE of subcomplexes after siRNA suppression of NDUFA11, mass spectrometry identification of subcomplex components\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KD with defined biochemical phenotype and MS identification, replicated by independent lab\",\n      \"pmids\": [\"24191001\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"C9orf72 directly stabilizes TIMMDC1 protein in the mitochondrial inner membrane by recruiting the prohibitin complex to inhibit m-AAA protease-dependent degradation of TIMMDC1, thereby maintaining complex I assembly and oxidative phosphorylation.\",\n      \"method\": \"Co-immunoprecipitation, proximity ligation, siRNA/knockout cell lines, protease inhibitor experiments, complex I activity assays, patient-derived neuron analysis\",\n      \"journal\": \"Cell metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP identifying the C9orf72/prohibitin/m-AAA protease/TIMMDC1 axis, multiple orthogonal methods, replicated in patient neurons\",\n      \"pmids\": [\"33545050\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"A deep intronic variant in TIMMDC1 (c.597-1340A>G) causes aberrant splicing with inclusion of a cryptic exon, leading to loss of TIMMDC1 protein and mitochondrial complex I deficiency, establishing TIMMDC1 as a disease-associated complex I assembly factor.\",\n      \"method\": \"RNA sequencing, aberrant splicing analysis, protein analysis in patient-derived fibroblasts\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — RNA-seq and protein analysis in patient fibroblasts, single lab but mechanistically defined\",\n      \"pmids\": [\"28604674\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Splice-switching antisense oligonucleotides (SSOs) targeting the deep intronic TIMMDC1 variant c.597-1340A>G restore normal TIMMDC1 mRNA processing and protein levels in patient fibroblasts, rescuing complex I subunit abundance and mitochondrial function as confirmed by quantitative proteomics and real-time metabolic analysis.\",\n      \"method\": \"Antisense oligonucleotide treatment, RNA analysis, quantitative proteomics, real-time mitochondrial metabolic analysis in patient fibroblasts\",\n      \"journal\": \"NPJ genomic medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — functional rescue experiment with quantitative proteomics and metabolic readouts confirming mechanism\",\n      \"pmids\": [\"35091571\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"TIMMDC1 is destabilized in complex I assembly intermediates when either NDUFAF3 or NDUFAF4 is disrupted in Drosophila, placing TIMMDC1 downstream of these assembly factors in the complex I biogenesis pathway, specifically in Q-, N-, and PP-b-module assembly.\",\n      \"method\": \"Genetic epistasis analysis in Drosophila, blue-native PAGE, immunoblotting of assembly intermediates\",\n      \"journal\": \"iScience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis in Drosophila ortholog system with clear biochemical readout\",\n      \"pmids\": [\"34386730\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"TIMMDC1 is a direct target of miR-450a as identified by AGO-PAR-CLIP combined with RNA-seq, placing TIMMDC1 within a set of mitochondrial energy metabolism genes regulated post-transcriptionally in ovarian cancer cells.\",\n      \"method\": \"AGO-PAR-CLIP, RNA-seq, miRNA overexpression with target validation\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct AGO-PAR-CLIP binding evidence combined with transcriptomic readout\",\n      \"pmids\": [\"31101765\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"TIMMDC1 C-terminal truncation (p.Arg225*) acts as a hypomorphic variant that still allows partial complex I assembly rescue in TIMMDC1 knockout cells, demonstrating that the C-terminus of TIMMDC1 is not absolutely required for its assembly factor function.\",\n      \"method\": \"TIMMDC1 knockout cell complementation assay, complex I activity measurement, protein analysis\",\n      \"journal\": \"Human mutation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — knockout rescue experiment with direct functional readout\",\n      \"pmids\": [\"30981218\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"TIMMDC1 knockdown in gastric cancer cells selectively reduces mitochondrial complex I activity (but not complexes II–IV), inhibits mitochondrial respiration and glycolysis, reduces ATP production, and decreases phosphorylation of AKT (Ser473) and GSK-3β (Ser9) with downstream reduction of β-catenin and c-Myc.\",\n      \"method\": \"siRNA knockdown, Seahorse mitochondrial respiration assay, complex activity assays, western blotting, in vivo xenograft\",\n      \"journal\": \"International journal of biological sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean KD with defined biochemical phenotype (complex I specificity) and signaling pathway placement\",\n      \"pmids\": [\"30123074\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"TIMMDC1 (C3orf1) localizes to the mitochondrial inner membrane and its depletion in 95D lung carcinoma cells reduces mitochondrial viability, membrane potential, and ATPase activity, inhibiting cell growth and migration with upregulation of cell-cycle arrest genes (CCNG2, PTEN) and migration-inhibiting genes (TIMP3, COL3A1) and downregulation of NUPR1.\",\n      \"method\": \"siRNA knockdown, mitochondrial localization confirmation, mitochondrial membrane potential assay, ATPase activity assay, microarray gene expression analysis, cell migration and proliferation assays\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct localization experiment with functional consequence, clean KD with defined phenotypic readouts\",\n      \"pmids\": [\"25391042\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"METTL3 methyltransferase suppresses TIMMDC1 expression via m6A methylation of TIMMDC1 mRNA, as confirmed by Me-RIP assay and RIP showing METTL3-TIMMDC1 mRNA interaction, thereby inhibiting PDGF-BB-induced airway smooth muscle cell proliferation, migration, and M2 macrophage polarization.\",\n      \"method\": \"Me-RIP assay, RIP assay, METTL3 knockdown/overexpression, TIMMDC1 knockdown/overexpression, cell proliferation and migration assays, flow cytometry\",\n      \"journal\": \"Immunobiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct Me-RIP evidence of m6A modification with functional rescue experiments\",\n      \"pmids\": [\"40409178\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"TIMMDC1 (TMEM126B complex member) is identified as a component of the MCIA complex (alongside ACAD9, ECSIT, NDUFAF1, TMEM126B) by complexome profiling, and TMEM126B loss disrupts MCIA complex integrity and complex I assembly.\",\n      \"method\": \"Complexome profiling, viral rescue in patient cell lines\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — complexome profiling provides direct physical association evidence in a defined complex\",\n      \"pmids\": [\"27374774\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TIMMDC1 is a 4-pass membrane protein embedded in the mitochondrial inner membrane that functions as an assembly factor for the membrane arm of respiratory complex I by associating with the MCIA complex (ACAD9, ECSIT, NDUFAF1, TMEM126B) and core complex I subunits; its protein stability is maintained by C9orf72-recruited prohibitin complex that prevents m-AAA protease-dependent degradation, and its loss — whether through genetic variants, siRNA depletion, or miR-450a targeting — selectively abolishes complex I activity, impairs oxidative phosphorylation and ATP production, and reduces downstream AKT/GSK-3β/β-catenin signaling.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"TIMMDC1 is a mitochondrial inner membrane assembly factor essential for biogenesis of the membrane arm of respiratory complex I. It physically associates with the MCIA complex (ACAD9, ECSIT, NDUFAF1, TMEM126B) and core complex I subunits, and its depletion selectively abolishes complex I activity while leaving complexes II–IV intact, thereby impairing oxidative phosphorylation and ATP production [PMID:24344204, PMID:30123074]. TIMMDC1 protein stability is maintained by a C9orf72–prohibitin axis that prevents m-AAA protease-dependent degradation, and its expression is regulated post-transcriptionally by miR-450a and METTL3-mediated m6A methylation [PMID:33545050, PMID:31101765, PMID:40409178]. A deep intronic TIMMDC1 variant (c.597-1340A>G) causes aberrant splicing and loss of protein, resulting in mitochondrial complex I deficiency, a phenotype rescuable by splice-switching antisense oligonucleotides [PMID:28604674, PMID:35091571].\",\n  \"teleology\": [\n    {\n      \"year\": 2013,\n      \"claim\": \"Establishing TIMMDC1 as a complex I assembly factor resolved its unknown mitochondrial function by showing it physically engages the MCIA complex and core complex I subunits, and that its depletion reduces complex I activity and cellular respiration.\",\n      \"evidence\": \"AP-MS, reciprocal co-IP, siRNA knockdown with complex I activity assays and respiration measurement in human cells; independently, BN-PAGE/MS identification of TIMMDC1 on 550/815 kDa complex I subcomplexes\",\n      \"pmids\": [\"24344204\", \"24191001\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Precise step in the complex I assembly pathway at which TIMMDC1 acts was not defined\",\n        \"Topology and transmembrane domain contributions to function were not characterized\",\n        \"No structural model of TIMMDC1 within the MCIA complex\"\n      ]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Complexome profiling confirmed TIMMDC1 as a stable MCIA complex component, anchoring it alongside ACAD9, ECSIT, NDUFAF1, and TMEM126B in the complex I assembly pathway.\",\n      \"evidence\": \"Complexome profiling and viral rescue in patient cell lines\",\n      \"pmids\": [\"27374774\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Stoichiometry and direct contact partners within the MCIA complex not resolved\",\n        \"Whether TIMMDC1 loss destabilizes the entire MCIA complex or only selected subunits was not tested\"\n      ]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Discovery of a deep intronic TIMMDC1 variant causing aberrant splicing and complex I deficiency established TIMMDC1 as a Mendelian disease gene, linking its loss of function to human mitochondrial disease.\",\n      \"evidence\": \"RNA-seq and protein analysis in patient-derived fibroblasts carrying c.597-1340A>G\",\n      \"pmids\": [\"28604674\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Single family report; genetic confirmation in additional kindreds was lacking\",\n        \"Clinical spectrum and genotype–phenotype correlations were not fully defined\"\n      ]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Demonstrating that TIMMDC1 knockdown selectively impairs complex I (not II–IV), suppresses respiration and glycolysis, and reduces AKT/GSK-3β/β-catenin signaling linked TIMMDC1-dependent bioenergetics to downstream oncogenic signaling.\",\n      \"evidence\": \"siRNA knockdown in gastric cancer cells, Seahorse metabolic analysis, complex activity assays, western blotting, in vivo xenograft\",\n      \"pmids\": [\"30123074\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether AKT pathway effects are a direct consequence of reduced ATP or a parallel TIMMDC1 function is unresolved\",\n        \"Cancer context generalizability beyond gastric cancer not tested\"\n      ]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identifying miR-450a as a direct post-transcriptional repressor of TIMMDC1 and showing that a C-terminal truncation (p.Arg225*) retains partial assembly function defined regulatory and structural boundaries of TIMMDC1 activity.\",\n      \"evidence\": \"AGO-PAR-CLIP and RNA-seq in ovarian cancer cells; TIMMDC1-KO complementation assay with truncation mutant\",\n      \"pmids\": [\"31101765\", \"30981218\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Physiological relevance of miR-450a regulation of TIMMDC1 outside cancer context unknown\",\n        \"Minimal functional domain of TIMMDC1 not mapped\"\n      ]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Revealing that C9orf72 recruits the prohibitin complex to shield TIMMDC1 from m-AAA protease degradation uncovered a dedicated protein quality-control mechanism governing complex I assembly factor stability.\",\n      \"evidence\": \"Co-IP, proximity ligation, KO cell lines, protease inhibitor experiments, complex I assays, patient-derived neuron analysis\",\n      \"pmids\": [\"33545050\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether this protective mechanism operates on other MCIA subunits was not addressed\",\n        \"Structural basis of the C9orf72–prohibitin–TIMMDC1 interaction is unknown\"\n      ]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Genetic epistasis in Drosophila placed TIMMDC1 downstream of NDUFAF3/NDUFAF4 in complex I biogenesis, specifying its role in Q-, N-, and PP-b-module assembly steps.\",\n      \"evidence\": \"Drosophila genetic epistasis, BN-PAGE, immunoblotting of assembly intermediates\",\n      \"pmids\": [\"34386730\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether the same epistatic hierarchy holds in mammalian systems is unconfirmed\",\n        \"Mechanism by which NDUFAF3/4 loss destabilizes TIMMDC1 is unclear\"\n      ]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Splice-switching antisense oligonucleotides correcting the TIMMDC1 intronic variant restored protein levels and mitochondrial function, providing proof-of-concept for therapeutic rescue of TIMMDC1 deficiency.\",\n      \"evidence\": \"ASO treatment of patient fibroblasts with quantitative proteomics and real-time metabolic analysis\",\n      \"pmids\": [\"35091571\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"In vivo efficacy and delivery to affected tissues (brain, muscle) not demonstrated\",\n        \"Long-term stability of rescue not assessed\"\n      ]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Demonstrating METTL3-mediated m6A methylation of TIMMDC1 mRNA as a repressive mechanism added an epitranscriptomic layer of TIMMDC1 regulation with consequences for cell proliferation and immune polarization.\",\n      \"evidence\": \"Me-RIP, RIP, METTL3 knockdown/overexpression with TIMMDC1 rescue in airway smooth muscle cells\",\n      \"pmids\": [\"40409178\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Specific m6A sites on TIMMDC1 mRNA were not mapped\",\n        \"Whether m6A regulation affects TIMMDC1 in non-disease contexts is unknown\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"A high-resolution structural model of TIMMDC1 within the MCIA complex and the precise mechanism by which TIMMDC1 facilitates membrane-arm subunit insertion remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No cryo-EM or crystal structure of TIMMDC1 alone or in complex\",\n        \"Precise contacts between TIMMDC1 transmembrane domains and complex I subunits unknown\",\n        \"Whether TIMMDC1 has catalytic activity or functions purely as a scaffold is undefined\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 1, 11]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [0, 2, 9]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [0, 1, 8]},\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [0, 1, 5, 11]}\n    ],\n    \"complexes\": [\n      \"MCIA complex\"\n    ],\n    \"partners\": [\n      \"ACAD9\",\n      \"ECSIT\",\n      \"NDUFAF1\",\n      \"TMEM126B\",\n      \"C9orf72\",\n      \"METTL3\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}