{"gene":"CHCHD6","run_date":"2026-04-28T17:28:52","timeline":{"discoveries":[{"year":2007,"finding":"CHCHD6 was identified as a component of a mitochondrial protein complex co-immunoprecipitated with mitofilin (inner membrane), along with metaxins 1 and 2, SAM50, CHCHD3, and DnaJC11, suggesting a role in protein import and mitochondrial structure maintenance.","method":"Monoclonal antibody immunocapture / co-immunoprecipitation","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2 — reciprocal Co-IP identifying complex membership; single study","pmids":["17624330"],"is_preprint":false},{"year":2012,"finding":"CHCHD6 (CHCM1) localizes predominantly to the mitochondrial inner membrane; its knockdown causes severe defects in cristae morphology (hollow cristae, loss of structural definitions), reductions in ATP production, oxygen consumption, and cell growth. CHCHD6 directly interacts via its C-terminal end with mitofilin, and knockdown of either protein reduces the other's protein levels, indicating coordinate regulation.","method":"Knockdown (siRNA), transmission electron microscopy, co-immunoprecipitation, domain-deletion constructs, oxygen consumption and ATP assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (KD phenotype, direct interaction assay, domain mapping, functional assays) in a single study","pmids":["22228767"],"is_preprint":false},{"year":2015,"finding":"CHCHD6 (Mic25) is a peripheral subunit of the human MICOS complex; its depletion does not affect cristae morphology or stability of other MICOS components, in contrast to core subunits Mic60/Mitofilin, Mic19/CHCHD3, and Sam50.","method":"Knockdown cell lines, immunoblot analysis of complex stability, electron microscopy","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 — defined hierarchy by systematic KD of most MICOS/MIB subunits; single lab","pmids":["25781180"],"is_preprint":false},{"year":2015,"finding":"CHCHD6 (Mic25) physically interacts with Sam50 (outer membrane) and with mitofilin, forming a MICOS complex together with CHCHD3. TALEN-generated CHCHD6 knockout cells show reduced cristae density but no reduction in mitochondrial membrane potential or ATP content, unlike mitofilin knockdown cells.","method":"Immunoprecipitation, TALEN-mediated gene knockout, transmission electron microscopy, mitochondrial membrane potential assay, ATP assay","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 1-2 — direct interaction shown by IP, KO phenotype characterized by multiple orthogonal methods","pmids":["26530328"],"is_preprint":false},{"year":2016,"finding":"CHCHD6 resides within the MICOS complex along with mitofilin, CHCHD3, and CHCHD10; CHCHD10 disease mutations cause MICOS complex disassembly and loss of cristae, establishing CHCHD6 as a constituent of the complex affected by CHCHD10 pathogenic variants.","method":"Co-immunoprecipitation, immunoblot of MICOS subunit levels in patient fibroblasts, electron microscopy","journal":"EMBO molecular medicine","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP and loss-of-function in patient cells; CHCHD6 role inferred from complex membership","pmids":["26666268"],"is_preprint":false},{"year":2018,"finding":"In vivo knockdown of Chchd6 in mice improved hepatic steatosis and insulin resistance; in vitro downregulation of Chchd6 lowered mitochondrial respiration and caused a shift toward glycolytic metabolism, establishing CHCHD6 as a regulator of mitochondrial respiratory function relevant to NAFLD.","method":"In vivo siRNA knockdown in mouse liver, in vitro knockdown, Seahorse metabolic flux assay","journal":"Cell systems","confidence":"Medium","confidence_rationale":"Tier 2 — clean KD with defined metabolic phenotype in vivo and in vitro; single lab","pmids":["29361464"],"is_preprint":false},{"year":2022,"finding":"CHCHD6 mechanistically connects APP processing and mitochondrial dysfunction in Alzheimer's disease: the APP intracellular domain fragment inhibits CHCHD6 transcription by binding its promoter; CHCHD6 and APP bind and stabilize one another; reduced CHCHD6 enhances APP accumulation on mitochondria-associated ER membranes and accelerates APP processing, induces mitochondrial dysfunction and neuronal cholesterol accumulation; compensation for CHCHD6 loss in an AD mouse model reduces AD neuropathology and cognitive impairment.","method":"Chromatin immunoprecipitation, co-immunoprecipitation, cellular and animal AD models, promoter-binding assay, CHCHD6 rescue in AD mouse model with behavioral/neuropathological readouts","journal":"Acta neuropathologica","confidence":"High","confidence_rationale":"Tier 1-2 — multiple orthogonal methods (ChIP, Co-IP, in vivo rescue) establishing a mechanistic feedback loop","pmids":["36104602"],"is_preprint":false},{"year":2023,"finding":"Cardiac-specific knockdown of Drosophila CHCHD3/6 (ortholog of mammalian CHCHD3/CHCHD6) results in compromised heart contractility, diminished sarcomeric actin and myosin levels, reduced cardiac ATP, and mitochondrial fission-fusion defects, placing the MICOS subunit in a pathway required for actomyosin integrity and cardiac energy supply.","method":"Drosophila cardiac-specific RNAi knockdown, heart contractility imaging, immunofluorescence for sarcomeric proteins, ATP assay, mitochondrial morphology analysis","journal":"eLife","confidence":"Medium","confidence_rationale":"Tier 2 — defined cellular phenotypes with multiple readouts in Drosophila ortholog model; CHCHD3 and CHCHD6 not fully separated","pmids":["37404133"],"is_preprint":false},{"year":2024,"finding":"Knockdown of Chchd6 (together with Mic60) in HepG2 cells lowers mitochondrial Ca2+ uptake and retention and induces oxidative stress, linking CHCHD6 to mitochondrial calcium homeostasis and redox regulation.","method":"siRNA knockdown in HepG2 cells, mitochondrial calcium uptake/retention assay, oxidative stress measurement","journal":"bioRxiv","confidence":"Low","confidence_rationale":"Tier 3 — single preprint, Chchd6 and Mic60 knocked down together without full separation of individual contributions","pmids":["bio_10.1101_2024.06.20.599846"],"is_preprint":true},{"year":2026,"finding":"CHCHD6 modulates mitochondrial DNA distribution (intertwined state) which stabilizes amorphous calcium-phosphate mineral precursors in chondrocyte mitochondria; targeting CHCHD6 inhibits cartilage calcification and impairs osteoarthritis progression.","method":"CHCHD6 modulation in chondrocyte/OA models, electron microscopy of mineral precursors, in vivo OA progression assay","journal":"Science bulletin","confidence":"Medium","confidence_rationale":"Tier 2 — loss-of-function with defined structural and disease phenotype; single study","pmids":["41864783"],"is_preprint":false}],"current_model":"CHCHD6 (Mic25) is a peripheral subunit of the mitochondrial MICOS complex at the inner membrane, where it directly interacts with mitofilin/MIC60 and SAM50 to support cristae morphology and mitochondrial respiration; it also participates in a feedback loop with APP processing in Alzheimer's disease (suppressing CHCHD6 transcription via the APP intracellular domain) and regulates mitochondrial calcium homeostasis and mtDNA organization, with its loss impairing ATP production, oxidative phosphorylation, and cristae integrity across multiple cell types."},"narrative":{"teleology":[{"year":2007,"claim":"The identity of CHCHD6 as part of a mitofilin-containing inner membrane complex was unknown; co-immunoprecipitation revealed CHCHD6 alongside SAM50, CHCHD3, metaxins, and DnaJC11, establishing it as a mitochondrial complex component.","evidence":"Monoclonal antibody immunocapture from HeLa mitochondrial extracts","pmids":["17624330"],"confidence":"Medium","gaps":["Single Co-IP study without reciprocal pull-down from CHCHD6 bait","Functional role of CHCHD6 within the complex not addressed","Stoichiometry and topology not determined"]},{"year":2012,"claim":"Whether CHCHD6 had a direct functional role in cristae maintenance was untested; siRNA knockdown showed severe cristae morphology defects, reduced ATP and oxygen consumption, and domain-mapping demonstrated a direct C-terminal interaction with mitofilin, establishing CHCHD6 as a functional participant in cristae organization.","evidence":"siRNA knockdown in human cells, TEM, co-IP with domain-deletion constructs, metabolic assays","pmids":["22228767"],"confidence":"High","gaps":["Whether CHCHD6 is essential or redundant with paralogous subunits not resolved","Mechanism by which CHCHD6 loss disrupts cristae not defined at a structural level"]},{"year":2015,"claim":"The hierarchical importance of CHCHD6 within the MICOS complex was unclear; systematic knockdown and knockout studies showed that CHCHD6 depletion does not destabilize other MICOS subunits, positioning it as a peripheral rather than core subunit, though its loss still reduces cristae density.","evidence":"Systematic siRNA knockdown of MICOS subunits and TALEN-mediated CHCHD6 KO with TEM and immunoblot in human cells","pmids":["25781180","26530328"],"confidence":"High","gaps":["Discrepancy between studies on severity of cristae and metabolic phenotypes upon CHCHD6 loss","Specific contribution of CHCHD6 versus CHCHD3 to MICOS assembly not fully separated"]},{"year":2016,"claim":"Whether pathogenic mutations in the paralog CHCHD10 affected CHCHD6-containing complexes was unknown; patient fibroblast analysis showed CHCHD10 mutations cause MICOS disassembly including CHCHD6 destabilization, linking CHCHD6 to neuromuscular disease-associated MICOS disruption.","evidence":"Co-IP and immunoblot in patient fibroblasts carrying CHCHD10 mutations, TEM","pmids":["26666268"],"confidence":"Medium","gaps":["CHCHD6 role inferred from complex membership rather than direct manipulation","Whether CHCHD6 itself harbors disease-causing variants not tested"]},{"year":2018,"claim":"A physiological role of CHCHD6 in whole-organ metabolism was unexplored; hepatic knockdown in mice improved steatosis and insulin resistance by shifting metabolism from oxidative phosphorylation toward glycolysis, establishing CHCHD6 as a regulator of liver energy balance.","evidence":"In vivo siRNA in mouse liver, Seahorse metabolic flux assay in vitro","pmids":["29361464"],"confidence":"Medium","gaps":["Long-term consequences of hepatic CHCHD6 loss not assessed","Mechanism linking reduced respiration to improved insulin sensitivity not defined"]},{"year":2022,"claim":"Whether CHCHD6 participated in Alzheimer's disease pathogenesis was unknown; a multi-method study showed that the APP intracellular domain binds the CHCHD6 promoter to suppress its transcription, that CHCHD6 and APP mutually stabilize each other, and that CHCHD6 restoration in AD mice rescues neuropathology and cognition, establishing a feedforward loop between APP processing and mitochondrial dysfunction.","evidence":"ChIP, co-IP, promoter-binding assays, AD mouse model rescue with behavioral and neuropathological readouts","pmids":["36104602"],"confidence":"High","gaps":["Whether CHCHD6 levels are reduced in human AD brain tissue not confirmed in this study","Relative contribution of CHCHD6's MICOS role versus its APP-stabilizing role to AD pathology not separated"]},{"year":2023,"claim":"Whether MICOS subunit loss affects cardiac function was untested; Drosophila cardiac-specific knockdown of the CHCHD3/6 ortholog caused contractility defects, sarcomeric protein loss, and mitochondrial dynamics imbalance, extending CHCHD6's role to cardiac energy homeostasis.","evidence":"Cardiac-specific RNAi in Drosophila with contractility imaging, sarcomeric immunofluorescence, ATP assay","pmids":["37404133"],"confidence":"Medium","gaps":["Drosophila ortholog encompasses both CHCHD3 and CHCHD6; individual contributions not separable","Mammalian cardiac phenotype of CHCHD6 loss not examined"]},{"year":2026,"claim":"A role for CHCHD6 in mtDNA distribution and biomineralization was previously unrecognized; modulation of CHCHD6 in chondrocytes showed it controls the intertwined state of mtDNA that stabilizes amorphous calcium-phosphate mineral precursors, and targeting CHCHD6 impairs osteoarthritis-associated cartilage calcification.","evidence":"CHCHD6 modulation in chondrocyte and OA models, TEM of mineral precursors, in vivo OA progression assay","pmids":["41864783"],"confidence":"Medium","gaps":["Mechanism linking CHCHD6 to mtDNA distribution state not molecularly defined","Whether the calcification role is MICOS-dependent or independent not established"]},{"year":null,"claim":"The precise structural basis of CHCHD6 integration into MICOS, its non-redundant functions relative to paralog CHCHD3, and the molecular mechanism by which it influences mtDNA organization remain unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No high-resolution structure of CHCHD6 within the MICOS complex","Individual CHCHD6 versus CHCHD3 contributions to cristae morphology not genetically separated in mammalian systems","Direct mechanism of CHCHD6 in mitochondrial calcium uptake not isolated from co-depletion experiments"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[1,2,3]}],"localization":[{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[0,1,2,3,4,5,7]}],"pathway":[{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[1,3,5,7]},{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[1,2,3,4]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[6]}],"complexes":["MICOS"],"partners":["MIC60","SAM50","CHCHD3","CHCHD10","APP"],"other_free_text":[]},"mechanistic_narrative":"CHCHD6 (Mic25) is a peripheral subunit of the mitochondrial contact site and cristae organizing system (MICOS) at the inner membrane, where it maintains cristae architecture and supports oxidative phosphorylation. It directly binds mitofilin/MIC60 via its C-terminal domain and interacts with SAM50 at the outer membrane; its depletion causes cristae structural defects, reduced oxygen consumption, and diminished ATP production, though it is dispensable for the stability of other core MICOS subunits [PMID:22228767, PMID:25781180, PMID:26530328]. CHCHD6 also influences mitochondrial DNA distribution, which regulates calcium-phosphate mineral precursor stabilization in chondrocytes and cartilage calcification [PMID:41864783]. In the context of Alzheimer's disease, the APP intracellular domain directly suppresses CHCHD6 transcription, and CHCHD6 loss promotes APP accumulation on mitochondria-associated ER membranes and accelerates amyloidogenic processing; restoring CHCHD6 in an AD mouse model reduces neuropathology and cognitive impairment [PMID:36104602]."},"prefetch_data":{"uniprot":{"accession":"Q9BRQ6","full_name":"MICOS complex subunit MIC25","aliases":["Coiled-coil-helix cristae morphology protein 1","Coiled-coil-helix-coiled-coil-helix domain-containing protein 6"],"length_aa":235,"mass_kda":26.5,"function":"Component of the MICOS complex, a large protein complex of the mitochondrial inner membrane that plays crucial roles in the maintenance of crista junctions, inner membrane architecture, and formation of contact sites to the outer membrane","subcellular_location":"Mitochondrion inner membrane; Mitochondrion","url":"https://www.uniprot.org/uniprotkb/Q9BRQ6/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CHCHD6","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/CHCHD6","total_profiled":1310},"omim":[{"mim_id":"616658","title":"MITOCHONDRIAL CONTACT SITE AND CRISTAE ORGANIZING SYSTEM, 13-KD SUBUNIT; MICOS13","url":"https://www.omim.org/entry/616658"},{"mim_id":"615634","title":"COILED-COIL-HELIX-COILED-COIL-HELIX DOMAIN-CONTAINING PROTEIN 6; CHCHD6","url":"https://www.omim.org/entry/615634"},{"mim_id":"613748","title":"COILED-COIL-HELIX-COILED-COIL-HELIX DOMAIN-CONTAINING PROTEIN 3; CHCHD3","url":"https://www.omim.org/entry/613748"},{"mim_id":"612058","title":"SAMM50 SORTING AND ASSEMBLY MACHINERY COMPONENT; SAMM50","url":"https://www.omim.org/entry/612058"},{"mim_id":"608555","title":"METAXIN 2; MTX2","url":"https://www.omim.org/entry/608555"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Mitochondria","reliability":"Supported"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"brain","ntpm":62.3}],"url":"https://www.proteinatlas.org/search/CHCHD6"},"hgnc":{"alias_symbol":["MGC13016","PPP1R23","CHCM1","Mic25","MICOS25"],"prev_symbol":[]},"alphafold":{"accession":"Q9BRQ6","domains":[{"cath_id":"1.20.5","chopping":"130-188","consensus_level":"medium","plddt":96.1132,"start":130,"end":188},{"cath_id":"1.10.287","chopping":"199-234","consensus_level":"high","plddt":95.0964,"start":199,"end":234}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9BRQ6","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9BRQ6-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9BRQ6-F1-predicted_aligned_error_v6.png","plddt_mean":78.75},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CHCHD6","jax_strain_url":"https://www.jax.org/strain/search?query=CHCHD6"},"sequence":{"accession":"Q9BRQ6","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9BRQ6.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9BRQ6/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9BRQ6"}},"corpus_meta":[{"pmid":"17624330","id":"PMC_17624330","title":"The mitochondrial inner membrane protein mitofilin exists as a complex with SAM50, metaxins 1 and 2, coiled-coil-helix coiled-coil-helix domain-containing protein 3 and 6 and DnaJC11.","date":"2007","source":"FEBS letters","url":"https://pubmed.ncbi.nlm.nih.gov/17624330","citation_count":179,"is_preprint":false},{"pmid":"26477565","id":"PMC_26477565","title":"Evolution and structural organization of the mitochondrial contact site (MICOS) complex and the mitochondrial intermembrane space bridging (MIB) complex.","date":"2015","source":"Biochimica et biophysica acta","url":"https://pubmed.ncbi.nlm.nih.gov/26477565","citation_count":159,"is_preprint":false},{"pmid":"26666268","id":"PMC_26666268","title":"CHCHD10 mutations promote loss of mitochondrial cristae junctions with impaired mitochondrial genome maintenance and inhibition of apoptosis.","date":"2016","source":"EMBO molecular 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Analysis Reveals Intermediate Stage of Non-Lesional Psoriatic Skin and Points out the Importance of Proteins Outside this Trend.","date":"2019","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/31388062","citation_count":26,"is_preprint":false},{"pmid":"30427857","id":"PMC_30427857","title":"Identification and characterization of protein N-myristoylation occurring on four human mitochondrial proteins, SAMM50, TOMM40, MIC19, and MIC25.","date":"2018","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/30427857","citation_count":25,"is_preprint":false},{"pmid":"34688661","id":"PMC_34688661","title":"A retinoic acid receptor β2 agonist attenuates transcriptome and metabolome changes underlying nonalcohol-associated fatty liver disease.","date":"2021","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/34688661","citation_count":23,"is_preprint":false},{"pmid":"37404133","id":"PMC_37404133","title":"Mitochondrial MICOS complex 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along with metaxins 1 and 2, SAM50, CHCHD3, and DnaJC11, suggesting a role in protein import and mitochondrial structure maintenance.\",\n      \"method\": \"Monoclonal antibody immunocapture / co-immunoprecipitation\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP identifying complex membership; single study\",\n      \"pmids\": [\"17624330\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"CHCHD6 (CHCM1) localizes predominantly to the mitochondrial inner membrane; its knockdown causes severe defects in cristae morphology (hollow cristae, loss of structural definitions), reductions in ATP production, oxygen consumption, and cell growth. CHCHD6 directly interacts via its C-terminal end with mitofilin, and knockdown of either protein reduces the other's protein levels, indicating coordinate regulation.\",\n      \"method\": \"Knockdown (siRNA), transmission electron microscopy, co-immunoprecipitation, domain-deletion constructs, oxygen consumption and ATP assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (KD phenotype, direct interaction assay, domain mapping, functional assays) in a single study\",\n      \"pmids\": [\"22228767\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"CHCHD6 (Mic25) is a peripheral subunit of the human MICOS complex; its depletion does not affect cristae morphology or stability of other MICOS components, in contrast to core subunits Mic60/Mitofilin, Mic19/CHCHD3, and Sam50.\",\n      \"method\": \"Knockdown cell lines, immunoblot analysis of complex stability, electron microscopy\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — defined hierarchy by systematic KD of most MICOS/MIB subunits; single lab\",\n      \"pmids\": [\"25781180\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"CHCHD6 (Mic25) physically interacts with Sam50 (outer membrane) and with mitofilin, forming a MICOS complex together with CHCHD3. TALEN-generated CHCHD6 knockout cells show reduced cristae density but no reduction in mitochondrial membrane potential or ATP content, unlike mitofilin knockdown cells.\",\n      \"method\": \"Immunoprecipitation, TALEN-mediated gene knockout, transmission electron microscopy, mitochondrial membrane potential assay, ATP assay\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct interaction shown by IP, KO phenotype characterized by multiple orthogonal methods\",\n      \"pmids\": [\"26530328\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CHCHD6 resides within the MICOS complex along with mitofilin, CHCHD3, and CHCHD10; CHCHD10 disease mutations cause MICOS complex disassembly and loss of cristae, establishing CHCHD6 as a constituent of the complex affected by CHCHD10 pathogenic variants.\",\n      \"method\": \"Co-immunoprecipitation, immunoblot of MICOS subunit levels in patient fibroblasts, electron microscopy\",\n      \"journal\": \"EMBO molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP and loss-of-function in patient cells; CHCHD6 role inferred from complex membership\",\n      \"pmids\": [\"26666268\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"In vivo knockdown of Chchd6 in mice improved hepatic steatosis and insulin resistance; in vitro downregulation of Chchd6 lowered mitochondrial respiration and caused a shift toward glycolytic metabolism, establishing CHCHD6 as a regulator of mitochondrial respiratory function relevant to NAFLD.\",\n      \"method\": \"In vivo siRNA knockdown in mouse liver, in vitro knockdown, Seahorse metabolic flux assay\",\n      \"journal\": \"Cell systems\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean KD with defined metabolic phenotype in vivo and in vitro; single lab\",\n      \"pmids\": [\"29361464\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CHCHD6 mechanistically connects APP processing and mitochondrial dysfunction in Alzheimer's disease: the APP intracellular domain fragment inhibits CHCHD6 transcription by binding its promoter; CHCHD6 and APP bind and stabilize one another; reduced CHCHD6 enhances APP accumulation on mitochondria-associated ER membranes and accelerates APP processing, induces mitochondrial dysfunction and neuronal cholesterol accumulation; compensation for CHCHD6 loss in an AD mouse model reduces AD neuropathology and cognitive impairment.\",\n      \"method\": \"Chromatin immunoprecipitation, co-immunoprecipitation, cellular and animal AD models, promoter-binding assay, CHCHD6 rescue in AD mouse model with behavioral/neuropathological readouts\",\n      \"journal\": \"Acta neuropathologica\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal methods (ChIP, Co-IP, in vivo rescue) establishing a mechanistic feedback loop\",\n      \"pmids\": [\"36104602\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Cardiac-specific knockdown of Drosophila CHCHD3/6 (ortholog of mammalian CHCHD3/CHCHD6) results in compromised heart contractility, diminished sarcomeric actin and myosin levels, reduced cardiac ATP, and mitochondrial fission-fusion defects, placing the MICOS subunit in a pathway required for actomyosin integrity and cardiac energy supply.\",\n      \"method\": \"Drosophila cardiac-specific RNAi knockdown, heart contractility imaging, immunofluorescence for sarcomeric proteins, ATP assay, mitochondrial morphology analysis\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — defined cellular phenotypes with multiple readouts in Drosophila ortholog model; CHCHD3 and CHCHD6 not fully separated\",\n      \"pmids\": [\"37404133\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Knockdown of Chchd6 (together with Mic60) in HepG2 cells lowers mitochondrial Ca2+ uptake and retention and induces oxidative stress, linking CHCHD6 to mitochondrial calcium homeostasis and redox regulation.\",\n      \"method\": \"siRNA knockdown in HepG2 cells, mitochondrial calcium uptake/retention assay, oxidative stress measurement\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single preprint, Chchd6 and Mic60 knocked down together without full separation of individual contributions\",\n      \"pmids\": [\"bio_10.1101_2024.06.20.599846\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"CHCHD6 modulates mitochondrial DNA distribution (intertwined state) which stabilizes amorphous calcium-phosphate mineral precursors in chondrocyte mitochondria; targeting CHCHD6 inhibits cartilage calcification and impairs osteoarthritis progression.\",\n      \"method\": \"CHCHD6 modulation in chondrocyte/OA models, electron microscopy of mineral precursors, in vivo OA progression assay\",\n      \"journal\": \"Science bulletin\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — loss-of-function with defined structural and disease phenotype; single study\",\n      \"pmids\": [\"41864783\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CHCHD6 (Mic25) is a peripheral subunit of the mitochondrial MICOS complex at the inner membrane, where it directly interacts with mitofilin/MIC60 and SAM50 to support cristae morphology and mitochondrial respiration; it also participates in a feedback loop with APP processing in Alzheimer's disease (suppressing CHCHD6 transcription via the APP intracellular domain) and regulates mitochondrial calcium homeostasis and mtDNA organization, with its loss impairing ATP production, oxidative phosphorylation, and cristae integrity across multiple cell types.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"CHCHD6 (Mic25) is a peripheral subunit of the mitochondrial contact site and cristae organizing system (MICOS) at the inner membrane, where it maintains cristae architecture and supports oxidative phosphorylation. It directly binds mitofilin/MIC60 via its C-terminal domain and interacts with SAM50 at the outer membrane; its depletion causes cristae structural defects, reduced oxygen consumption, and diminished ATP production, though it is dispensable for the stability of other core MICOS subunits [PMID:22228767, PMID:25781180, PMID:26530328]. CHCHD6 also influences mitochondrial DNA distribution, which regulates calcium-phosphate mineral precursor stabilization in chondrocytes and cartilage calcification [PMID:41864783]. In the context of Alzheimer's disease, the APP intracellular domain directly suppresses CHCHD6 transcription, and CHCHD6 loss promotes APP accumulation on mitochondria-associated ER membranes and accelerates amyloidogenic processing; restoring CHCHD6 in an AD mouse model reduces neuropathology and cognitive impairment [PMID:36104602].\",\n  \"teleology\": [\n    {\n      \"year\": 2007,\n      \"claim\": \"The identity of CHCHD6 as part of a mitofilin-containing inner membrane complex was unknown; co-immunoprecipitation revealed CHCHD6 alongside SAM50, CHCHD3, metaxins, and DnaJC11, establishing it as a mitochondrial complex component.\",\n      \"evidence\": \"Monoclonal antibody immunocapture from HeLa mitochondrial extracts\",\n      \"pmids\": [\"17624330\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single Co-IP study without reciprocal pull-down from CHCHD6 bait\", \"Functional role of CHCHD6 within the complex not addressed\", \"Stoichiometry and topology not determined\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Whether CHCHD6 had a direct functional role in cristae maintenance was untested; siRNA knockdown showed severe cristae morphology defects, reduced ATP and oxygen consumption, and domain-mapping demonstrated a direct C-terminal interaction with mitofilin, establishing CHCHD6 as a functional participant in cristae organization.\",\n      \"evidence\": \"siRNA knockdown in human cells, TEM, co-IP with domain-deletion constructs, metabolic assays\",\n      \"pmids\": [\"22228767\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether CHCHD6 is essential or redundant with paralogous subunits not resolved\", \"Mechanism by which CHCHD6 loss disrupts cristae not defined at a structural level\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"The hierarchical importance of CHCHD6 within the MICOS complex was unclear; systematic knockdown and knockout studies showed that CHCHD6 depletion does not destabilize other MICOS subunits, positioning it as a peripheral rather than core subunit, though its loss still reduces cristae density.\",\n      \"evidence\": \"Systematic siRNA knockdown of MICOS subunits and TALEN-mediated CHCHD6 KO with TEM and immunoblot in human cells\",\n      \"pmids\": [\"25781180\", \"26530328\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Discrepancy between studies on severity of cristae and metabolic phenotypes upon CHCHD6 loss\", \"Specific contribution of CHCHD6 versus CHCHD3 to MICOS assembly not fully separated\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Whether pathogenic mutations in the paralog CHCHD10 affected CHCHD6-containing complexes was unknown; patient fibroblast analysis showed CHCHD10 mutations cause MICOS disassembly including CHCHD6 destabilization, linking CHCHD6 to neuromuscular disease-associated MICOS disruption.\",\n      \"evidence\": \"Co-IP and immunoblot in patient fibroblasts carrying CHCHD10 mutations, TEM\",\n      \"pmids\": [\"26666268\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"CHCHD6 role inferred from complex membership rather than direct manipulation\", \"Whether CHCHD6 itself harbors disease-causing variants not tested\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"A physiological role of CHCHD6 in whole-organ metabolism was unexplored; hepatic knockdown in mice improved steatosis and insulin resistance by shifting metabolism from oxidative phosphorylation toward glycolysis, establishing CHCHD6 as a regulator of liver energy balance.\",\n      \"evidence\": \"In vivo siRNA in mouse liver, Seahorse metabolic flux assay in vitro\",\n      \"pmids\": [\"29361464\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Long-term consequences of hepatic CHCHD6 loss not assessed\", \"Mechanism linking reduced respiration to improved insulin sensitivity not defined\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Whether CHCHD6 participated in Alzheimer's disease pathogenesis was unknown; a multi-method study showed that the APP intracellular domain binds the CHCHD6 promoter to suppress its transcription, that CHCHD6 and APP mutually stabilize each other, and that CHCHD6 restoration in AD mice rescues neuropathology and cognition, establishing a feedforward loop between APP processing and mitochondrial dysfunction.\",\n      \"evidence\": \"ChIP, co-IP, promoter-binding assays, AD mouse model rescue with behavioral and neuropathological readouts\",\n      \"pmids\": [\"36104602\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether CHCHD6 levels are reduced in human AD brain tissue not confirmed in this study\", \"Relative contribution of CHCHD6's MICOS role versus its APP-stabilizing role to AD pathology not separated\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Whether MICOS subunit loss affects cardiac function was untested; Drosophila cardiac-specific knockdown of the CHCHD3/6 ortholog caused contractility defects, sarcomeric protein loss, and mitochondrial dynamics imbalance, extending CHCHD6's role to cardiac energy homeostasis.\",\n      \"evidence\": \"Cardiac-specific RNAi in Drosophila with contractility imaging, sarcomeric immunofluorescence, ATP assay\",\n      \"pmids\": [\"37404133\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Drosophila ortholog encompasses both CHCHD3 and CHCHD6; individual contributions not separable\", \"Mammalian cardiac phenotype of CHCHD6 loss not examined\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"A role for CHCHD6 in mtDNA distribution and biomineralization was previously unrecognized; modulation of CHCHD6 in chondrocytes showed it controls the intertwined state of mtDNA that stabilizes amorphous calcium-phosphate mineral precursors, and targeting CHCHD6 impairs osteoarthritis-associated cartilage calcification.\",\n      \"evidence\": \"CHCHD6 modulation in chondrocyte and OA models, TEM of mineral precursors, in vivo OA progression assay\",\n      \"pmids\": [\"41864783\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism linking CHCHD6 to mtDNA distribution state not molecularly defined\", \"Whether the calcification role is MICOS-dependent or independent not established\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The precise structural basis of CHCHD6 integration into MICOS, its non-redundant functions relative to paralog CHCHD3, and the molecular mechanism by which it influences mtDNA organization remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No high-resolution structure of CHCHD6 within the MICOS complex\", \"Individual CHCHD6 versus CHCHD3 contributions to cristae morphology not genetically separated in mammalian systems\", \"Direct mechanism of CHCHD6 in mitochondrial calcium uptake not isolated from co-depletion experiments\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [1, 2, 3]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [0, 1, 2, 3, 4, 5, 7]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [1, 3, 5, 7]},\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [1, 2, 3, 4]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [6]}\n    ],\n    \"complexes\": [\"MICOS\"],\n    \"partners\": [\"MIC60\", \"SAM50\", \"CHCHD3\", \"CHCHD10\", \"APP\"],\n    \"other_free_text\": []\n  }\n}\n```"}