{"gene":"DNAJC15","run_date":"2026-06-09T23:54:42","timeline":{"discoveries":[{"year":2013,"finding":"MCJ/DnaJC15 localizes to the mitochondrial inner membrane and interacts preferentially with Complex I of the electron transport chain, where it impairs the formation of respiratory supercomplexes and functions as a negative regulator of the respiratory chain. Loss of MCJ leads to increased Complex I activity, mitochondrial membrane potential, and ATP production.","method":"Subcellular fractionation, Co-immunoprecipitation, functional respiratory chain assays in MCJ-deficient cells/mice","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (fractionation, Co-IP, functional assays in KO model) in a single study, replicated by subsequent independent labs","pmids":["23530063"],"is_preprint":false},{"year":2012,"finding":"MCJ is anchored in the mitochondrial inner membrane with its C-terminal J domain facing the matrix. It forms a stable subcomplex with MAGMAS, a component of the mitochondrial import motor, and both interact with core components of the TIM23 pre-protein translocase. The recombinant soluble MCJ domain stimulates the ATPase activity of mtHsp70 (mortalin), the central component of the TIM23 import motor, and this stimulation is counteracted by MAGMAS. Loss of MCJ impairs pre-protein import into mitochondria, and MCJ can functionally substitute for Tim14, the essential J co-chaperone of the yeast import motor.","method":"Submitochondrial fractionation, Co-immunoprecipitation, in vitro ATPase assay with recombinant proteins, yeast complementation assay, import assay in MCJ-depleted mitochondria","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution of ATPase stimulation, reciprocal Co-IP, yeast complementation, and import assay; multiple orthogonal methods in a single rigorous study","pmids":["23263864"],"is_preprint":false},{"year":2014,"finding":"DnaJC15 overexpression promotes mitochondrial permeability transition pore (MPTP) opening and apoptosis upon cisplatin treatment, while reduced DnaJC15 suppresses MPTP activation. DnaJC15 exerts its pro-apoptotic function through cyclophilin D (CypD), recruiting and coupling CypD with the mitochondrial permeability transition machinery.","method":"Overexpression and knockdown of DnaJC15 in cells, MPTP opening assays, Co-immunoprecipitation with CypD, cisplatin treatment with apoptosis readouts","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with CypD plus functional gain/loss-of-function assays; single lab with two orthogonal methods","pmids":["24603329"],"is_preprint":false},{"year":2016,"finding":"MCJ acts as an endogenous brake for mitochondrial respiration in CD8+ T cells by interfering with formation of electron transport chain respiratory supercomplexes. MCJ deficiency enhances oxidative phosphorylation and subcellular ATP accumulation, which selectively increases secretion (but not expression) of IFN-γ. MCJ also modulates effector CD8+ T cell metabolism during the contraction phase, resulting in superior memory T cell formation.","method":"Metabolic profiling (Seahorse), supercomplex analysis, MCJ-deficient mice, cytokine secretion assays, influenza infection model","journal":"Immunity","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (metabolic profiling, supercomplex native gels, KO mouse model with in vivo infection), replicated concept from prior work","pmids":["27234056"],"is_preprint":false},{"year":2004,"finding":"Cell type-specific expression of MCJ is controlled by methylation of a CpG island within its first exon (not the promoter). The CpG island is methylated and MCJ is not expressed in epithelial cells, but unmethylated and expressed in lymphocyte or fibroblast cells. CpG island methylation is associated with loss of histone acetylation at both the island and the promoter region, indicating methylation-directed chromatin remodeling leads to gene inactivation.","method":"Bisulfite sequencing, RT-PCR, chromatin immunoprecipitation (ChIP) for histone acetylation marks","journal":"Carcinogenesis","confidence":"High","confidence_rationale":"Tier 2 / Strong — bisulfite sequencing plus ChIP with multiple cell types; mechanistic link between CpG methylation, chromatin structure, and gene silencing established by orthogonal methods","pmids":["14729589"],"is_preprint":false},{"year":2017,"finding":"APAP (acetaminophen) treatment interferes with formation of mitochondrial respiratory supercomplexes via MCJ, leading to decreased ATP production and increased ROS generation. In vivo inhibition of MCJ expression protects the liver from APAP-induced injury.","method":"Supercomplex native gel analysis, ROS and ATP measurement, siRNA-mediated MCJ inhibition in mouse APAP liver injury model","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — supercomplex analysis, functional metabolic assays, and in vivo therapeutic intervention; multiple orthogonal methods across mechanistic and translational levels","pmids":["29233977"],"is_preprint":false},{"year":2020,"finding":"MCJ is an endogenous negative regulator of respiratory chain Complex I in hepatocytes. Decreasing MCJ expression (via nanoparticle- or GalNAc-formulated siRNA) enhances hepatocyte capacity for β-oxidation of fatty acids, reduces lipid accumulation, and decreases hepatocyte damage and fibrosis in multiple NASH mouse models.","method":"siRNA-mediated MCJ silencing in vivo (nanoparticle/GalNAc formulations), β-oxidation assay, lipid quantification, histological fibrosis scoring in NASH mouse models","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — therapeutic silencing with functional β-oxidation readout, replicated across multiple animal models and two delivery approaches","pmids":["32620763"],"is_preprint":false},{"year":2018,"finding":"ETV7, a transcriptional repressor of the ETS family induced by doxorubicin, directly binds the DNAJC15 promoter and represses DNAJC15 expression, leading to doxorubicin resistance in breast cancer cells. ETV7-mediated resistance involves increased doxorubicin efflux via nuclear pumps, which is partially rescued by DNAJC15 upregulation.","method":"ChIP/promoter binding assay for ETV7 at DNAJC15 promoter, ETV7 overexpression with DNAJC15 expression measurement, drug efflux assays, DNAJC15 rescue experiments","journal":"Neoplasia","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — promoter binding confirmed by ChIP, functional rescue experiment performed; single lab with two orthogonal methods","pmids":["30025229"],"is_preprint":false},{"year":2019,"finding":"Induction of glycolysis in CD8+ T cells upregulates MCJ expression, and MCJ acts synergistically with glycolysis to promote caspase-3 activity. MCJ-deficient effector CD8+ T cells show reduced glycolysis and considerably less active caspase-3 compared to wild-type cells. In non-glycolytic IL-15-cultured CD8+ T cells, MCJ expression is repressed by methylation, paralleling reduced caspase-3 activity and increased survival.","method":"MCJ-deficient mouse CD8+ T cells, caspase-3 activity assays, glycolysis measurements, methylation analysis of MCJ locus in IL-2 vs IL-15 cultured T cells","journal":"Frontiers in cell and developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO mouse model with defined caspase-3 readout and methylation analysis; single lab with two orthogonal approaches","pmids":["30915331"],"is_preprint":false},{"year":2024,"finding":"S-adenosylmethionine (SAMe) negatively regulates MCJ expression in the liver. MCJ is methylated at lysine residues and interacts with MATα1 (methionine adenosyltransferase alpha 1) within liver mitochondria, likely to facilitate its methylation. Deficiency in MATα1 leads to MCJ upregulation, while MAT1A overexpression and SAMe treatment reduce MCJ expression.","method":"Co-immunoprecipitation of MCJ with MATα1 in liver mitochondria, mass spectrometry identification of lysine methylation on MCJ, MAT1A overexpression, SAMe treatment, MATα1-KO model","journal":"International journal of biological sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus MS identification of PTM site and gain/loss-of-function; single lab, multiple orthogonal methods","pmids":["38385082"],"is_preprint":false},{"year":2025,"finding":"DNAJC15 overexpression in ovarian cancer cells induces lipid peroxidation and ferroptosis, increasing sensitivity to cisplatin. Inhibition of lipid peroxidation with Ferrostatin-1 reduces ferroptosis vulnerability and recovers cisplatin resistance, establishing a mechanistic link between DNAJC15, ferroptosis induction, and chemosensitivity.","method":"DNAJC15 overexpression, lipid peroxidation assays, Ferrostatin-1 rescue experiments, cisplatin sensitivity assays in ovarian cancer cells","journal":"Open biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional gain-of-function with pharmacological rescue; single lab with two orthogonal approaches (lipid peroxidation assay + ferroptosis inhibitor rescue)","pmids":["39809321"],"is_preprint":false},{"year":2026,"finding":"The mitochondrial protease OMA1 cleaves DNAJC15, promoting its degradation by the m-AAA protease AFG3L2 under cellular stress conditions. Loss of DNAJC15 impairs mitochondrial protein import and restricts OXPHOS biogenesis. Non-imported mitochondrial preproteins accumulate at the endoplasmic reticulum, inducing an unfolded protein response.","method":"OMA1 cleavage assay, AFG3L2 protease assay, mitochondrial protein import assay in DNAJC15-deficient cells, ER stress/UPR reporter assays","journal":"Nature structural & molecular biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — direct protease cleavage demonstrated, import assay, ER stress readout; multiple orthogonal mechanistic methods in a single rigorous study","pmids":["41760807"],"is_preprint":false},{"year":2025,"finding":"Absence of MCJ in brown adipose tissue (BAT) promotes thermogenesis even in the absence of UCP1. MCJKO mice show altered mitochondrial morphology consistent with BAT activation, and the eIF2α-mediated stress response is required for this enhanced thermogenesis, as in vivo CRISPR deletion of eIF2α in MCJKO mice abrogates the thermogenic phenotype.","method":"MCJKO mouse model, electron microscopy of mitochondrial morphology, proteomics, in vivo CRISPR deletion of eIF2α in MCJKO mice, thermogenesis measurement","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis (double KO), electron microscopy, proteomics, and in vivo thermogenesis assay; multiple orthogonal methods","pmids":["39805849"],"is_preprint":false},{"year":2026,"finding":"Elevated MCJ levels in cancer cells promote aggressive proliferative and migratory phenotypes by mediating a preferential rerouting of electron flux through Complex II (succinate dehydrogenase complex) rather than Complex I. This results in suppressed glycolysis, increased lipid accumulation and oxidation, maintained NADH levels, and preserved respiratory output despite Complex I uncoupling.","method":"MCJ overexpression in cancer cells, Seahorse metabolic flux analysis, Complex I/II activity assays, lipid accumulation and oxidation measurements, proliferation and migration assays","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional gain-of-function with metabolic flux analysis and Complex I/II activity assays; single lab, multiple orthogonal metabolic methods","pmids":["41484063"],"is_preprint":false}],"current_model":"DNAJC15/MCJ is a mitochondrial inner membrane co-chaperone that serves as an endogenous negative regulator of respiratory chain Complex I by interfering with the formation of respiratory supercomplexes, while also functioning as a J co-chaperone of the TIM23 protein import motor (stimulating mtHsp70/mortalin ATPase activity); its expression is epigenetically controlled by CpG island methylation within its first exon and by SAMe-dependent lysine methylation, it is subject to stress-induced proteolytic degradation by OMA1 and AFG3L2, and its loss or silencing enhances mitochondrial respiration, fatty acid β-oxidation, CD8+ T cell and BAT function, while its overexpression promotes ferroptosis and Complex II-driven lipid metabolism in cancer cells."},"narrative":{"mechanistic_narrative":"DNAJC15 (MCJ) is a mitochondrial inner-membrane J-domain co-chaperone that acts as an endogenous brake on oxidative metabolism, anchored in the inner membrane with its C-terminal J domain facing the matrix [PMID:23263864]. It functions in two coupled capacities: as a negative regulator of the respiratory chain, where it interacts preferentially with Complex I and interferes with the assembly of respiratory supercomplexes, such that its loss raises Complex I activity, membrane potential, and ATP output [PMID:23530063, PMID:27234056]; and as a J co-chaperone of the TIM23 pre-protein import motor, forming a subcomplex with MAGMAS and stimulating the ATPase activity of mtHsp70/mortalin to drive pre-protein import [PMID:23263864, PMID:41760807]. Through its respiratory restraint, DNAJC15 governs metabolic programs across tissues — its silencing enhances fatty acid β-oxidation and protects against hepatic steatosis and fibrosis [PMID:32620763], shapes CD8+ T cell effector and memory metabolism [PMID:27234056], and limits UCP1-independent thermogenesis in brown adipose tissue via an eIF2α-dependent stress response [PMID:39805849]. DNAJC15 also couples mitochondria to cell death, recruiting cyclophilin D to promote permeability transition pore opening and apoptosis [PMID:24603329] and driving lipid peroxidation and ferroptosis in cancer cells [PMID:39809321]. Its abundance is tightly controlled at multiple levels: epigenetically by CpG-island methylation within its first exon [PMID:14729589] and by transcriptional repression via ETV7 [PMID:30025229], post-translationally by SAMe-dependent lysine methylation in concert with MATα1 [PMID:38385082], and by stress-induced cleavage by OMA1 followed by AFG3L2-mediated degradation [PMID:41760807].","teleology":[{"year":2004,"claim":"Established how DNAJC15 expression is set in a cell-type-specific manner, identifying an epigenetic switch rather than transcription-factor control as the primary determinant.","evidence":"Bisulfite sequencing and ChIP for histone acetylation across epithelial, lymphocyte, and fibroblast cell types","pmids":["14729589"],"confidence":"High","gaps":["Does not identify the trans factors directing methylation","Does not link expression level to mitochondrial function"]},{"year":2012,"claim":"Defined the molecular activity of DNAJC15 as a J co-chaperone of the TIM23 import motor, answering what its J domain does biochemically.","evidence":"Submitochondrial fractionation, reciprocal Co-IP with MAGMAS/TIM23, in vitro mtHsp70 ATPase assay, yeast Tim14 complementation, and import assay in MCJ-depleted mitochondria","pmids":["23263864"],"confidence":"High","gaps":["Does not reconcile import-motor role with respiratory regulation","Stoichiometry within the import motor not resolved"]},{"year":2013,"claim":"Established DNAJC15 as a negative regulator of the respiratory chain acting through Complex I and supercomplex assembly, defining its core metabolic function.","evidence":"Subcellular fractionation, Co-IP with Complex I, and respiratory assays in MCJ-deficient cells and mice","pmids":["23530063"],"confidence":"High","gaps":["Structural basis for supercomplex interference unknown","How Complex I binding relates to the J/ATPase activity not defined"]},{"year":2014,"claim":"Connected DNAJC15 to regulated cell death, showing it couples the permeability transition machinery to apoptotic signaling.","evidence":"Gain/loss-of-function with MPTP opening assays and Co-IP with cyclophilin D under cisplatin treatment","pmids":["24603329"],"confidence":"Medium","gaps":["Single lab without reciprocal validation of the CypD interaction","Relationship between MPTP role and respiratory function unclear"]},{"year":2016,"claim":"Extended the respiratory-brake model to immune physiology, showing DNAJC15 tunes CD8+ T cell metabolism and memory formation in vivo.","evidence":"Seahorse metabolic profiling, supercomplex native gels, MCJ-KO mice, cytokine assays, and influenza infection","pmids":["27234056"],"confidence":"High","gaps":["Mechanism linking ATP accumulation to selective IFN-γ secretion not resolved"]},{"year":2017,"claim":"Showed DNAJC15 as a pharmacological node in drug-induced liver injury, where xenobiotic stress acts through MCJ to disrupt supercomplexes.","evidence":"Supercomplex native gels, ROS/ATP measurement, and siRNA MCJ inhibition in a mouse APAP liver injury model","pmids":["29233977"],"confidence":"High","gaps":["How APAP engages MCJ molecularly not defined"]},{"year":2018,"claim":"Identified a transcriptional repressor controlling DNAJC15 in cancer, linking its silencing to chemoresistance.","evidence":"ChIP/promoter binding of ETV7 at the DNAJC15 promoter, ETV7 overexpression, drug efflux assays, and DNAJC15 rescue in breast cancer cells","pmids":["30025229"],"confidence":"Medium","gaps":["Mechanistic link between DNAJC15 and efflux pumps only partially rescued","Single lab"]},{"year":2019,"claim":"Linked DNAJC15 expression to glycolytic state and caspase-3-dependent T cell fate, integrating metabolic input with apoptotic output.","evidence":"MCJ-KO T cells, caspase-3 activity assays, glycolysis measurements, and methylation analysis in IL-2 vs IL-15 cultures","pmids":["30915331"],"confidence":"Medium","gaps":["Direct mechanism by which MCJ promotes caspase-3 activity unclear","Single lab"]},{"year":2020,"claim":"Demonstrated DNAJC15 silencing as a therapeutic strategy in fatty liver disease, validating its β-oxidation-restraining role in hepatocytes.","evidence":"Nanoparticle/GalNAc siRNA silencing in vivo, β-oxidation and lipid assays, and fibrosis scoring across NASH models","pmids":["32620763"],"confidence":"High","gaps":["Long-term consequences of chronic MCJ loss on import function not assessed"]},{"year":2024,"claim":"Revealed post-translational control of DNAJC15 via SAMe and lysine methylation, adding a metabolite-sensing layer to its regulation.","evidence":"Co-IP of MCJ with MATα1 in liver mitochondria, MS identification of lysine methylation, MAT1A overexpression/SAMe treatment, and MATα1-KO","pmids":["38385082"],"confidence":"Medium","gaps":["Functional consequence of specific methylation sites not established","Single lab"]},{"year":2025,"claim":"Showed DNAJC15 drives ferroptosis and chemosensitivity in cancer when elevated, defining a context-dependent pro-death role.","evidence":"DNAJC15 overexpression, lipid peroxidation assays, Ferrostatin-1 rescue, and cisplatin sensitivity in ovarian cancer cells","pmids":["39809321"],"confidence":"Medium","gaps":["Molecular trigger linking MCJ to lipid peroxidation unknown","Single lab"]},{"year":2025,"claim":"Established DNAJC15 as a restraint on UCP1-independent thermogenesis, identifying eIF2α stress signaling as the required effector.","evidence":"MCJ-KO mice, EM of mitochondrial morphology, proteomics, in vivo CRISPR deletion of eIF2α, and thermogenesis measurement","pmids":["39805849"],"confidence":"High","gaps":["How MCJ loss engages the eIF2α stress response mechanistically not defined"]},{"year":2026,"claim":"Defined the stress-induced proteolytic turnover of DNAJC15 and tied its loss to import failure and ER-localized UPR.","evidence":"OMA1 cleavage and AFG3L2 protease assays, import assays in DNAJC15-deficient cells, and ER stress/UPR reporters","pmids":["41760807"],"confidence":"High","gaps":["Stress signals that activate OMA1 cleavage of MCJ not enumerated"]},{"year":2026,"claim":"Showed that high DNAJC15 reroutes electron flux to Complex II to support aggressive cancer metabolism, refining its role beyond simple Complex I inhibition.","evidence":"MCJ overexpression, Seahorse flux analysis, Complex I/II activity assays, lipid measurements, and proliferation/migration assays","pmids":["41484063"],"confidence":"Medium","gaps":["Mechanism of preferential Complex II routing unresolved","Single lab"]},{"year":null,"claim":"How DNAJC15's dual roles as TIM23 import co-chaperone and Complex I/supercomplex regulator are physically and functionally coordinated at the inner membrane remains unresolved.","evidence":"","pmids":[],"confidence":"High","gaps":["No structural model of MCJ bound to Complex I or the import motor","Whether import and respiratory functions are mutually exclusive states is unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0044183","term_label":"protein folding chaperone","supporting_discovery_ids":[1,11]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,1,3]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[1]}],"localization":[{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[0,1,9]}],"pathway":[{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[0,3,6,13]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[1,11]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[2,10]},{"term_id":"R-HSA-8953897","term_label":"Cellular responses to stimuli","supporting_discovery_ids":[11,12]}],"complexes":["TIM23 import motor"],"partners":["MAGMAS","HSPA9","PPIF","MAT1A","OMA1","AFG3L2","ETV7"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9Y5T4","full_name":"DnaJ homolog subfamily C member 15","aliases":["Cell growth-inhibiting gene 22 protein","Methylation-controlled J protein","MCJ"],"length_aa":150,"mass_kda":16.4,"function":"Negative regulator of the mitochondrial respiratory chain. Prevents mitochondrial hyperpolarization state and restricts mitochondrial generation of ATP (By similarity). Acts as an import component of the TIM23 translocase complex. Stimulates the ATPase activity of HSPA9","subcellular_location":"Mitochondrion inner membrane","url":"https://www.uniprot.org/uniprotkb/Q9Y5T4/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/DNAJC15","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/DNAJC15","total_profiled":1310},"omim":[{"mim_id":"615339","title":"DNAJ/HSP40 HOMOLOG, SUBFAMILY C, MEMBER 15; DNAJC15","url":"https://www.omim.org/entry/615339"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/DNAJC15"},"hgnc":{"alias_symbol":["MCJ"],"prev_symbol":["DNAJD1"]},"alphafold":{"accession":"Q9Y5T4","domains":[{"cath_id":"1.10.287.110","chopping":"95-148","consensus_level":"high","plddt":96.1309,"start":95,"end":148},{"cath_id":"1.20.5","chopping":"35-77","consensus_level":"medium","plddt":77.9133,"start":35,"end":77}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9Y5T4","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9Y5T4-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9Y5T4-F1-predicted_aligned_error_v6.png","plddt_mean":78.94},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=DNAJC15","jax_strain_url":"https://www.jax.org/strain/search?query=DNAJC15"},"sequence":{"accession":"Q9Y5T4","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9Y5T4.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9Y5T4/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9Y5T4"}},"corpus_meta":[{"pmid":"32620763","id":"PMC_32620763","title":"Silencing hepatic MCJ attenuates non-alcoholic fatty liver disease (NAFLD) by increasing mitochondrial fatty acid oxidation.","date":"2020","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/32620763","citation_count":114,"is_preprint":false},{"pmid":"23530063","id":"PMC_23530063","title":"MCJ/DnaJC15, an endogenous mitochondrial repressor of the respiratory chain that controls metabolic alterations.","date":"2013","source":"Molecular and cellular biology","url":"https://pubmed.ncbi.nlm.nih.gov/23530063","citation_count":101,"is_preprint":false},{"pmid":"29233977","id":"PMC_29233977","title":"The mitochondrial negative regulator MCJ is a therapeutic target for acetaminophen-induced liver injury.","date":"2017","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/29233977","citation_count":98,"is_preprint":false},{"pmid":"27234056","id":"PMC_27234056","title":"Fine-Tuning of CD8(+) T Cell Mitochondrial Metabolism by the Respiratory Chain Repressor MCJ 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pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/40907687","citation_count":3,"is_preprint":false},{"pmid":"41760807","id":"PMC_41760807","title":"Stress adaptation of mitochondrial protein import by OMA1-mediated degradation of DNAJC15.","date":"2026","source":"Nature structural & molecular biology","url":"https://pubmed.ncbi.nlm.nih.gov/41760807","citation_count":2,"is_preprint":false},{"pmid":"36978641","id":"PMC_36978641","title":"In Vivo and In Vitro Expression of iC1, a Methylation-Controlled J Protein (MCJ) in Bovine Liver, and Response to In Vitro Bovine Fatty Liver Disease Model.","date":"2023","source":"Animals : an open access journal from MDPI","url":"https://pubmed.ncbi.nlm.nih.gov/36978641","citation_count":1,"is_preprint":false},{"pmid":"34495814","id":"PMC_34495814","title":"The in vitro antiviral activity of Lacticaseibacillus casei MCJ protein-based metabolites on bovine viral diarrhea virus.","date":"2021","source":"Animal biotechnology","url":"https://pubmed.ncbi.nlm.nih.gov/34495814","citation_count":0,"is_preprint":false},{"pmid":"41484063","id":"PMC_41484063","title":"MCJ modulates mitochondrial ETC flux to promote lipid metabolism-driven enhancement of cell proliferation and migration.","date":"2026","source":"Cell death & disease","url":"https://pubmed.ncbi.nlm.nih.gov/41484063","citation_count":0,"is_preprint":false},{"pmid":"35306115","id":"PMC_35306115","title":"Polyploidization affects the allelic variation of jasmonate-regulated protein Ta-JA1 belonging to the monocot chimeric jacalin (MCJ) family in wild emmer wheat.","date":"2022","source":"Gene","url":"https://pubmed.ncbi.nlm.nih.gov/35306115","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":14811,"output_tokens":3819,"usd":0.050859,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":11751,"output_tokens":4087,"usd":0.080465,"stage2_stop_reason":"end_turn"},"total_usd":0.131324,"stage1_batch_id":"msgbatch_01AsR7g8dGTEiEw9U83bJeWn","stage2_batch_id":"msgbatch_01YV5ZyxtFNUZEjxRcpd9jzb","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2013,\n      \"finding\": \"MCJ/DnaJC15 localizes to the mitochondrial inner membrane and interacts preferentially with Complex I of the electron transport chain, where it impairs the formation of respiratory supercomplexes and functions as a negative regulator of the respiratory chain. Loss of MCJ leads to increased Complex I activity, mitochondrial membrane potential, and ATP production.\",\n      \"method\": \"Subcellular fractionation, Co-immunoprecipitation, functional respiratory chain assays in MCJ-deficient cells/mice\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (fractionation, Co-IP, functional assays in KO model) in a single study, replicated by subsequent independent labs\",\n      \"pmids\": [\"23530063\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"MCJ is anchored in the mitochondrial inner membrane with its C-terminal J domain facing the matrix. It forms a stable subcomplex with MAGMAS, a component of the mitochondrial import motor, and both interact with core components of the TIM23 pre-protein translocase. The recombinant soluble MCJ domain stimulates the ATPase activity of mtHsp70 (mortalin), the central component of the TIM23 import motor, and this stimulation is counteracted by MAGMAS. Loss of MCJ impairs pre-protein import into mitochondria, and MCJ can functionally substitute for Tim14, the essential J co-chaperone of the yeast import motor.\",\n      \"method\": \"Submitochondrial fractionation, Co-immunoprecipitation, in vitro ATPase assay with recombinant proteins, yeast complementation assay, import assay in MCJ-depleted mitochondria\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution of ATPase stimulation, reciprocal Co-IP, yeast complementation, and import assay; multiple orthogonal methods in a single rigorous study\",\n      \"pmids\": [\"23263864\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"DnaJC15 overexpression promotes mitochondrial permeability transition pore (MPTP) opening and apoptosis upon cisplatin treatment, while reduced DnaJC15 suppresses MPTP activation. DnaJC15 exerts its pro-apoptotic function through cyclophilin D (CypD), recruiting and coupling CypD with the mitochondrial permeability transition machinery.\",\n      \"method\": \"Overexpression and knockdown of DnaJC15 in cells, MPTP opening assays, Co-immunoprecipitation with CypD, cisplatin treatment with apoptosis readouts\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with CypD plus functional gain/loss-of-function assays; single lab with two orthogonal methods\",\n      \"pmids\": [\"24603329\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"MCJ acts as an endogenous brake for mitochondrial respiration in CD8+ T cells by interfering with formation of electron transport chain respiratory supercomplexes. MCJ deficiency enhances oxidative phosphorylation and subcellular ATP accumulation, which selectively increases secretion (but not expression) of IFN-γ. MCJ also modulates effector CD8+ T cell metabolism during the contraction phase, resulting in superior memory T cell formation.\",\n      \"method\": \"Metabolic profiling (Seahorse), supercomplex analysis, MCJ-deficient mice, cytokine secretion assays, influenza infection model\",\n      \"journal\": \"Immunity\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (metabolic profiling, supercomplex native gels, KO mouse model with in vivo infection), replicated concept from prior work\",\n      \"pmids\": [\"27234056\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Cell type-specific expression of MCJ is controlled by methylation of a CpG island within its first exon (not the promoter). The CpG island is methylated and MCJ is not expressed in epithelial cells, but unmethylated and expressed in lymphocyte or fibroblast cells. CpG island methylation is associated with loss of histone acetylation at both the island and the promoter region, indicating methylation-directed chromatin remodeling leads to gene inactivation.\",\n      \"method\": \"Bisulfite sequencing, RT-PCR, chromatin immunoprecipitation (ChIP) for histone acetylation marks\",\n      \"journal\": \"Carcinogenesis\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — bisulfite sequencing plus ChIP with multiple cell types; mechanistic link between CpG methylation, chromatin structure, and gene silencing established by orthogonal methods\",\n      \"pmids\": [\"14729589\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"APAP (acetaminophen) treatment interferes with formation of mitochondrial respiratory supercomplexes via MCJ, leading to decreased ATP production and increased ROS generation. In vivo inhibition of MCJ expression protects the liver from APAP-induced injury.\",\n      \"method\": \"Supercomplex native gel analysis, ROS and ATP measurement, siRNA-mediated MCJ inhibition in mouse APAP liver injury model\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — supercomplex analysis, functional metabolic assays, and in vivo therapeutic intervention; multiple orthogonal methods across mechanistic and translational levels\",\n      \"pmids\": [\"29233977\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"MCJ is an endogenous negative regulator of respiratory chain Complex I in hepatocytes. Decreasing MCJ expression (via nanoparticle- or GalNAc-formulated siRNA) enhances hepatocyte capacity for β-oxidation of fatty acids, reduces lipid accumulation, and decreases hepatocyte damage and fibrosis in multiple NASH mouse models.\",\n      \"method\": \"siRNA-mediated MCJ silencing in vivo (nanoparticle/GalNAc formulations), β-oxidation assay, lipid quantification, histological fibrosis scoring in NASH mouse models\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — therapeutic silencing with functional β-oxidation readout, replicated across multiple animal models and two delivery approaches\",\n      \"pmids\": [\"32620763\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"ETV7, a transcriptional repressor of the ETS family induced by doxorubicin, directly binds the DNAJC15 promoter and represses DNAJC15 expression, leading to doxorubicin resistance in breast cancer cells. ETV7-mediated resistance involves increased doxorubicin efflux via nuclear pumps, which is partially rescued by DNAJC15 upregulation.\",\n      \"method\": \"ChIP/promoter binding assay for ETV7 at DNAJC15 promoter, ETV7 overexpression with DNAJC15 expression measurement, drug efflux assays, DNAJC15 rescue experiments\",\n      \"journal\": \"Neoplasia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — promoter binding confirmed by ChIP, functional rescue experiment performed; single lab with two orthogonal methods\",\n      \"pmids\": [\"30025229\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Induction of glycolysis in CD8+ T cells upregulates MCJ expression, and MCJ acts synergistically with glycolysis to promote caspase-3 activity. MCJ-deficient effector CD8+ T cells show reduced glycolysis and considerably less active caspase-3 compared to wild-type cells. In non-glycolytic IL-15-cultured CD8+ T cells, MCJ expression is repressed by methylation, paralleling reduced caspase-3 activity and increased survival.\",\n      \"method\": \"MCJ-deficient mouse CD8+ T cells, caspase-3 activity assays, glycolysis measurements, methylation analysis of MCJ locus in IL-2 vs IL-15 cultured T cells\",\n      \"journal\": \"Frontiers in cell and developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO mouse model with defined caspase-3 readout and methylation analysis; single lab with two orthogonal approaches\",\n      \"pmids\": [\"30915331\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"S-adenosylmethionine (SAMe) negatively regulates MCJ expression in the liver. MCJ is methylated at lysine residues and interacts with MATα1 (methionine adenosyltransferase alpha 1) within liver mitochondria, likely to facilitate its methylation. Deficiency in MATα1 leads to MCJ upregulation, while MAT1A overexpression and SAMe treatment reduce MCJ expression.\",\n      \"method\": \"Co-immunoprecipitation of MCJ with MATα1 in liver mitochondria, mass spectrometry identification of lysine methylation on MCJ, MAT1A overexpression, SAMe treatment, MATα1-KO model\",\n      \"journal\": \"International journal of biological sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus MS identification of PTM site and gain/loss-of-function; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"38385082\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"DNAJC15 overexpression in ovarian cancer cells induces lipid peroxidation and ferroptosis, increasing sensitivity to cisplatin. Inhibition of lipid peroxidation with Ferrostatin-1 reduces ferroptosis vulnerability and recovers cisplatin resistance, establishing a mechanistic link between DNAJC15, ferroptosis induction, and chemosensitivity.\",\n      \"method\": \"DNAJC15 overexpression, lipid peroxidation assays, Ferrostatin-1 rescue experiments, cisplatin sensitivity assays in ovarian cancer cells\",\n      \"journal\": \"Open biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional gain-of-function with pharmacological rescue; single lab with two orthogonal approaches (lipid peroxidation assay + ferroptosis inhibitor rescue)\",\n      \"pmids\": [\"39809321\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"The mitochondrial protease OMA1 cleaves DNAJC15, promoting its degradation by the m-AAA protease AFG3L2 under cellular stress conditions. Loss of DNAJC15 impairs mitochondrial protein import and restricts OXPHOS biogenesis. Non-imported mitochondrial preproteins accumulate at the endoplasmic reticulum, inducing an unfolded protein response.\",\n      \"method\": \"OMA1 cleavage assay, AFG3L2 protease assay, mitochondrial protein import assay in DNAJC15-deficient cells, ER stress/UPR reporter assays\",\n      \"journal\": \"Nature structural & molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct protease cleavage demonstrated, import assay, ER stress readout; multiple orthogonal mechanistic methods in a single rigorous study\",\n      \"pmids\": [\"41760807\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Absence of MCJ in brown adipose tissue (BAT) promotes thermogenesis even in the absence of UCP1. MCJKO mice show altered mitochondrial morphology consistent with BAT activation, and the eIF2α-mediated stress response is required for this enhanced thermogenesis, as in vivo CRISPR deletion of eIF2α in MCJKO mice abrogates the thermogenic phenotype.\",\n      \"method\": \"MCJKO mouse model, electron microscopy of mitochondrial morphology, proteomics, in vivo CRISPR deletion of eIF2α in MCJKO mice, thermogenesis measurement\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis (double KO), electron microscopy, proteomics, and in vivo thermogenesis assay; multiple orthogonal methods\",\n      \"pmids\": [\"39805849\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"Elevated MCJ levels in cancer cells promote aggressive proliferative and migratory phenotypes by mediating a preferential rerouting of electron flux through Complex II (succinate dehydrogenase complex) rather than Complex I. This results in suppressed glycolysis, increased lipid accumulation and oxidation, maintained NADH levels, and preserved respiratory output despite Complex I uncoupling.\",\n      \"method\": \"MCJ overexpression in cancer cells, Seahorse metabolic flux analysis, Complex I/II activity assays, lipid accumulation and oxidation measurements, proliferation and migration assays\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional gain-of-function with metabolic flux analysis and Complex I/II activity assays; single lab, multiple orthogonal metabolic methods\",\n      \"pmids\": [\"41484063\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"DNAJC15/MCJ is a mitochondrial inner membrane co-chaperone that serves as an endogenous negative regulator of respiratory chain Complex I by interfering with the formation of respiratory supercomplexes, while also functioning as a J co-chaperone of the TIM23 protein import motor (stimulating mtHsp70/mortalin ATPase activity); its expression is epigenetically controlled by CpG island methylation within its first exon and by SAMe-dependent lysine methylation, it is subject to stress-induced proteolytic degradation by OMA1 and AFG3L2, and its loss or silencing enhances mitochondrial respiration, fatty acid β-oxidation, CD8+ T cell and BAT function, while its overexpression promotes ferroptosis and Complex II-driven lipid metabolism in cancer cells.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"DNAJC15 (MCJ) is a mitochondrial inner-membrane J-domain co-chaperone that acts as an endogenous brake on oxidative metabolism, anchored in the inner membrane with its C-terminal J domain facing the matrix [#1]. It functions in two coupled capacities: as a negative regulator of the respiratory chain, where it interacts preferentially with Complex I and interferes with the assembly of respiratory supercomplexes, such that its loss raises Complex I activity, membrane potential, and ATP output [#0, #3]; and as a J co-chaperone of the TIM23 pre-protein import motor, forming a subcomplex with MAGMAS and stimulating the ATPase activity of mtHsp70/mortalin to drive pre-protein import [#1, #11]. Through its respiratory restraint, DNAJC15 governs metabolic programs across tissues — its silencing enhances fatty acid β-oxidation and protects against hepatic steatosis and fibrosis [#6], shapes CD8+ T cell effector and memory metabolism [#3], and limits UCP1-independent thermogenesis in brown adipose tissue via an eIF2α-dependent stress response [#12]. DNAJC15 also couples mitochondria to cell death, recruiting cyclophilin D to promote permeability transition pore opening and apoptosis [#2] and driving lipid peroxidation and ferroptosis in cancer cells [#10]. Its abundance is tightly controlled at multiple levels: epigenetically by CpG-island methylation within its first exon [#4] and by transcriptional repression via ETV7 [#7], post-translationally by SAMe-dependent lysine methylation in concert with MATα1 [#9], and by stress-induced cleavage by OMA1 followed by AFG3L2-mediated degradation [#11].\",\n  \"teleology\": [\n    {\n      \"year\": 2004,\n      \"claim\": \"Established how DNAJC15 expression is set in a cell-type-specific manner, identifying an epigenetic switch rather than transcription-factor control as the primary determinant.\",\n      \"evidence\": \"Bisulfite sequencing and ChIP for histone acetylation across epithelial, lymphocyte, and fibroblast cell types\",\n      \"pmids\": [\"14729589\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not identify the trans factors directing methylation\", \"Does not link expression level to mitochondrial function\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Defined the molecular activity of DNAJC15 as a J co-chaperone of the TIM23 import motor, answering what its J domain does biochemically.\",\n      \"evidence\": \"Submitochondrial fractionation, reciprocal Co-IP with MAGMAS/TIM23, in vitro mtHsp70 ATPase assay, yeast Tim14 complementation, and import assay in MCJ-depleted mitochondria\",\n      \"pmids\": [\"23263864\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not reconcile import-motor role with respiratory regulation\", \"Stoichiometry within the import motor not resolved\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Established DNAJC15 as a negative regulator of the respiratory chain acting through Complex I and supercomplex assembly, defining its core metabolic function.\",\n      \"evidence\": \"Subcellular fractionation, Co-IP with Complex I, and respiratory assays in MCJ-deficient cells and mice\",\n      \"pmids\": [\"23530063\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis for supercomplex interference unknown\", \"How Complex I binding relates to the J/ATPase activity not defined\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Connected DNAJC15 to regulated cell death, showing it couples the permeability transition machinery to apoptotic signaling.\",\n      \"evidence\": \"Gain/loss-of-function with MPTP opening assays and Co-IP with cyclophilin D under cisplatin treatment\",\n      \"pmids\": [\"24603329\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab without reciprocal validation of the CypD interaction\", \"Relationship between MPTP role and respiratory function unclear\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Extended the respiratory-brake model to immune physiology, showing DNAJC15 tunes CD8+ T cell metabolism and memory formation in vivo.\",\n      \"evidence\": \"Seahorse metabolic profiling, supercomplex native gels, MCJ-KO mice, cytokine assays, and influenza infection\",\n      \"pmids\": [\"27234056\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism linking ATP accumulation to selective IFN-γ secretion not resolved\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Showed DNAJC15 as a pharmacological node in drug-induced liver injury, where xenobiotic stress acts through MCJ to disrupt supercomplexes.\",\n      \"evidence\": \"Supercomplex native gels, ROS/ATP measurement, and siRNA MCJ inhibition in a mouse APAP liver injury model\",\n      \"pmids\": [\"29233977\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How APAP engages MCJ molecularly not defined\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Identified a transcriptional repressor controlling DNAJC15 in cancer, linking its silencing to chemoresistance.\",\n      \"evidence\": \"ChIP/promoter binding of ETV7 at the DNAJC15 promoter, ETV7 overexpression, drug efflux assays, and DNAJC15 rescue in breast cancer cells\",\n      \"pmids\": [\"30025229\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanistic link between DNAJC15 and efflux pumps only partially rescued\", \"Single lab\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Linked DNAJC15 expression to glycolytic state and caspase-3-dependent T cell fate, integrating metabolic input with apoptotic output.\",\n      \"evidence\": \"MCJ-KO T cells, caspase-3 activity assays, glycolysis measurements, and methylation analysis in IL-2 vs IL-15 cultures\",\n      \"pmids\": [\"30915331\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct mechanism by which MCJ promotes caspase-3 activity unclear\", \"Single lab\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Demonstrated DNAJC15 silencing as a therapeutic strategy in fatty liver disease, validating its β-oxidation-restraining role in hepatocytes.\",\n      \"evidence\": \"Nanoparticle/GalNAc siRNA silencing in vivo, β-oxidation and lipid assays, and fibrosis scoring across NASH models\",\n      \"pmids\": [\"32620763\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Long-term consequences of chronic MCJ loss on import function not assessed\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Revealed post-translational control of DNAJC15 via SAMe and lysine methylation, adding a metabolite-sensing layer to its regulation.\",\n      \"evidence\": \"Co-IP of MCJ with MATα1 in liver mitochondria, MS identification of lysine methylation, MAT1A overexpression/SAMe treatment, and MATα1-KO\",\n      \"pmids\": [\"38385082\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of specific methylation sites not established\", \"Single lab\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Showed DNAJC15 drives ferroptosis and chemosensitivity in cancer when elevated, defining a context-dependent pro-death role.\",\n      \"evidence\": \"DNAJC15 overexpression, lipid peroxidation assays, Ferrostatin-1 rescue, and cisplatin sensitivity in ovarian cancer cells\",\n      \"pmids\": [\"39809321\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular trigger linking MCJ to lipid peroxidation unknown\", \"Single lab\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Established DNAJC15 as a restraint on UCP1-independent thermogenesis, identifying eIF2α stress signaling as the required effector.\",\n      \"evidence\": \"MCJ-KO mice, EM of mitochondrial morphology, proteomics, in vivo CRISPR deletion of eIF2α, and thermogenesis measurement\",\n      \"pmids\": [\"39805849\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How MCJ loss engages the eIF2α stress response mechanistically not defined\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Defined the stress-induced proteolytic turnover of DNAJC15 and tied its loss to import failure and ER-localized UPR.\",\n      \"evidence\": \"OMA1 cleavage and AFG3L2 protease assays, import assays in DNAJC15-deficient cells, and ER stress/UPR reporters\",\n      \"pmids\": [\"41760807\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stress signals that activate OMA1 cleavage of MCJ not enumerated\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Showed that high DNAJC15 reroutes electron flux to Complex II to support aggressive cancer metabolism, refining its role beyond simple Complex I inhibition.\",\n      \"evidence\": \"MCJ overexpression, Seahorse flux analysis, Complex I/II activity assays, lipid measurements, and proliferation/migration assays\",\n      \"pmids\": [\"41484063\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of preferential Complex II routing unresolved\", \"Single lab\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How DNAJC15's dual roles as TIM23 import co-chaperone and Complex I/supercomplex regulator are physically and functionally coordinated at the inner membrane remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structural model of MCJ bound to Complex I or the import motor\", \"Whether import and respiratory functions are mutually exclusive states is unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0044183\", \"supporting_discovery_ids\": [1, 11]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 1, 3]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [0, 1, 9]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [0, 3, 6, 13]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [1, 11]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [2, 10]},\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [11, 12]}\n    ],\n    \"complexes\": [\"TIM23 import motor\"],\n    \"partners\": [\"MAGMAS\", \"HSPA9\", \"PPIF\", \"MAT1A\", \"OMA1\", \"AFG3L2\", \"ETV7\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}