{"gene":"CHCHD2","run_date":"2026-06-09T22:57:18","timeline":{"discoveries":[{"year":2014,"finding":"CHCHD2 (MNRR1) is imported to the mitochondrial intermembrane space (IMS) via a Mia40-mediated pathway, where it binds directly to cytochrome c oxidase (COX/Complex IV), and this association is required for full COX activity. Loss of CHCHD2 reduces COX activity, membrane potential, and growth rate while increasing ROS and mitochondrial fragmentation.","method":"Subcellular fractionation, co-immunoprecipitation with COX, functional respiration assays, knockdown with defined phenotypic readouts","journal":"Mitochondrion","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal binding demonstrated, direct functional assay (COX activity), multiple orthogonal methods in one study, independently replicated in subsequent papers","pmids":["25315652"],"is_preprint":false},{"year":2014,"finding":"In the nucleus, CHCHD2 (MNRR1) functions as a transcription factor that binds a novel oxygen-responsive element (ORE) in the promoter of COX4I2 (and itself) to stimulate transcription under hypoxia (4% oxygen). During stress, import into mitochondria is blocked, causing nuclear accumulation and enhanced transcriptional activity.","method":"Promoter-reporter assays, chromatin immunoprecipitation (ChIP), subcellular fractionation under normoxic vs. hypoxic conditions, knockdown/overexpression","journal":"Mitochondrion","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP plus reporter assay plus fractionation, replicated in multiple subsequent studies by the same and independent groups","pmids":["25315652"],"is_preprint":false},{"year":2014,"finding":"CHCHD2 binds to Bcl-xL at the mitochondria and inhibits mitochondrial accumulation and oligomerization of Bax, thereby suppressing mitochondrial outer membrane permeabilization (MOMP) and apoptosis. CHCHD2 levels decrease prior to MOMP in response to apoptotic stimuli, and its absence attenuates Bcl-xL's ability to block Bax activation.","method":"Co-immunoprecipitation (CHCHD2/Bcl-xL), overexpression and knockdown with Bax oligomerization assay, cytochrome c release assay, MOMP assay","journal":"Cell death and differentiation","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP, multiple functional assays (MOMP, Bax oligomerization, cytochrome c release), single lab but orthogonal methods","pmids":["25476776"],"is_preprint":false},{"year":2016,"finding":"Phosphorylation of CHCHD2 (MNRR1) at tyrosine-99 by Abl2 kinase (ARG) inside mitochondria promotes its binding to COX and stimulates respiration. A disease-associated Q112H mutation impairs interaction with Abl2, leading to defective tyrosine phosphorylation and reduced respiration.","method":"Site-directed mutagenesis (Y99 phosphorylation site), in vitro kinase assay, Co-IP of CHCHD2 with Abl2 and COX, oxygen consumption assay","journal":"Biochimica et biophysica acta. Molecular cell research","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — mutagenesis plus kinase assay plus functional respiration readout in one study, single lab","pmids":["27913209"],"is_preprint":false},{"year":2017,"finding":"CHCHD2 binds cytochrome c together with MICS1 (a Bax inhibitor-1 superfamily member) to modulate cell death signalling. Loss of CHCHD2 in Drosophila disrupts mitochondrial matrix/crista structures, impairs oxygen respiration, causes oxidative stress, and leads to dopaminergic neuron loss; these phenotypes are rescued by human CHCHD2 but not by PD-associated mutants.","method":"Co-immunoprecipitation (CHCHD2/cytochrome c/MICS1), Drosophila CHCHD2 knockout/overexpression, electron microscopy, oxygen consumption assay, dopaminergic neuron counting, genetic rescue with human WT vs. mutant CHCHD2","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP, in vivo genetic model with neuron counting, multiple orthogonal methods, genetic rescue experiment distinguishing WT from mutant","pmids":["28589937"],"is_preprint":false},{"year":2018,"finding":"CHCHD2 and CHCHD10 form a high-molecular-weight (~220 kDa) heterodimeric complex required for efficient mitochondrial respiration. The ALS-linked CHCHD10 p.R15L variant destabilizes CHCHD10, abolishes this complex, and impairs Complex I assembly and cellular respiration.","method":"Reciprocal co-immunoprecipitation (CHCHD2/CHCHD10), blue-native PAGE, oxygen consumption assay in patient fibroblasts, galactose proliferation assay","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — quantitative immunoprecipitation, BN-PAGE, functional respiration assay, patient material; replicated in subsequent structural analyses","pmids":["29121267"],"is_preprint":false},{"year":2018,"finding":"CHCHD2 accumulates preferentially in distressed mitochondria (upon loss of membrane potential), while CHCHD10 oligomerization depends on CHCHD2 expression. CHCHD2 and CHCHD10 form heterodimers distributed throughout mitochondrial cristae; disease-causing mutations in either protein can still form heterodimers.","method":"CHCHD2/CHCHD10 double knockout cell lines, Blue-native PAGE, immunofluorescence co-localization, heterodimer incorporation assay, mitochondrial stress induction","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 / Moderate — BN-PAGE plus KO cell lines plus functional assay, single lab but multiple orthogonal methods","pmids":["30084972"],"is_preprint":false},{"year":2018,"finding":"CHCHD10 serves as a scaffolding protein required for CHCHD2 (MNRR1) phosphorylation by ARG/Abl2 kinase; CHCHD10 co-purifies with COX and up-regulates COX activity. In the nucleus, CHCHD10 down-regulates ORE-containing gene expression by interacting with and augmenting transcriptional repressor CXXC5.","method":"Co-purification with COX, Co-IP (CHCHD10/CHCHD2/ARG), COX activity assay, nuclear CHCHD10 interaction with CXXC5, gene expression analysis","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, functional enzymatic assay, single lab with multiple methods; finding involves CHCHD10 mechanism but directly informs CHCHD2 phosphorylation pathway","pmids":["29540477"],"is_preprint":false},{"year":2019,"finding":"PD-associated CHCHD2 mutations R145Q and Q126X reduce interaction with CHCHD10 and disrupt the MICOS (mitochondrial contact site and cristae organizing system) complex, leading to hollow mitochondria with reduced cristae. Wild-type CHCHD2 physically colocalizes with MICOS components by super-resolution microscopy.","method":"CRISPR-Cas9 isogenic hESC lines, super-resolution microscopy (STED), co-immunoprecipitation (CHCHD2/CHCHD10), MICOS component quantification, electron microscopy of cristae","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 / Moderate — isogenic CRISPR lines, super-resolution microscopy, Co-IP, electron microscopy; single lab but multiple orthogonal methods","pmids":["30496485"],"is_preprint":false},{"year":2020,"finding":"Loss of CHCHD2 and CHCHD10 activates the mitochondrial stress-induced peptidase OMA1, which cleaves L-OPA1, thereby disrupting mitochondrial cristae. CHCHD2/CHCHD10 are partially functionally redundant; mutant CHCHD10 knock-in mice show the same OMA1 activation and L-OPA1 cleavage phenotype.","method":"CHCHD2/CHCHD10 double-knockout mice, OMA1 activity assay, OPA1 cleavage assay by immunoblot, mutant CHCHD10 knock-in mice, electron microscopy","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo DKO and KI mouse models, direct OMA1 activity assay, OPA1 cleavage validated across models","pmids":["32338760"],"is_preprint":false},{"year":2020,"finding":"Drosophila Chchd2 regulates mitochondrial morphology by stabilizing Opa1 protein levels. Chchd2 competes with the chaperone-like protein P32 for binding to YME1L protease; P32-YME1L interaction enhances Opa1 degradation, and Chchd2 stabilizes Opa1 by displacing P32 from YME1L. Co-immunoprecipitation confirmed Chchd2 interaction with P32 and YME1L.","method":"Drosophila Chchd2 knockout, co-immunoprecipitation (Chchd2/P32/YME1L), YME1L activity assay, OPA1 protein level quantification, epistasis with Marf overexpression and Opa1 RNAi","journal":"Cell death and differentiation","confidence":"High","confidence_rationale":"Tier 2 / Moderate — Co-IP, protease activity assay, in vivo genetic epistasis, multiple orthogonal methods in one study","pmids":["31907391"],"is_preprint":false},{"year":2020,"finding":"The T61I CHCHD2 mutation causes its precipitation (insolubility) inside the mitochondrial IMS, and T61I CHCHD2 exerts a dominant-negative effect by impairing the solubility of wild-type CHCHD2. Mitochondrial targeting of CHCHD2 depends on the four cysteine residues in the C-terminal CHCH domain, not on the N-terminal predicted targeting sequence.","method":"Subcellular fractionation, solubility assay (detergent-based), cysteine mutagenesis of CHCH domain, live-cell fluorescence microscopy, ROS and apoptosis assays","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — mutagenesis of targeting cysteines, direct solubility/fractionation assay, dominant-negative co-expression experiment; single lab but multiple orthogonal methods","pmids":["32068847"],"is_preprint":false},{"year":2020,"finding":"CHCHD2 (MNRR1) overexpression in MELAS cells induces the mitochondrial unfolded protein response (UPRmt), autophagy, and mitochondrial biogenesis, rescuing the mitochondrial phenotype. This rescue operates primarily through CHCHD2's nuclear transcription activator function. CHCHD2 acts upstream of the UPRmt mediator ATF5; CHCHD2 knockout cells display ~40% reduction in ATF5 protein.","method":"Overexpression in MELAS cybrid cells, UPRmt marker quantification, autophagy assay, ATF5 protein quantification in CHCHD2-KO cells, mitochondrial biogenesis assay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Moderate — MELAS disease model, KO cells, multiple functional readouts (UPRmt, autophagy, biogenesis), ATF5 epistasis; single lab but orthogonal methods","pmids":["33257573"],"is_preprint":false},{"year":2016,"finding":"CHCHD2 primes neuroectodermal differentiation of pluripotent stem cells by binding and sequestering SMAD4 to the mitochondria, thereby suppressing TGFβ signaling pathway activity.","method":"Co-immunoprecipitation (CHCHD2/SMAD4), subcellular fractionation, SMAD4 localization by immunofluorescence, TGFβ reporter assay, CHCHD2 knockdown/overexpression with neuroectodermal differentiation readout","journal":"The Journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, functional reporter assay, differentiation phenotype; single lab with multiple methods","pmids":["27810911"],"is_preprint":false},{"year":2022,"finding":"CHCHD2 and CHCHD10 interact with OMA1 in physiological conditions and suppress its enzymatic activity, restraining both the initiation of mitochondrial integrated stress response (mtISR) and OPA1 processing for mitochondrial fusion. During mitochondrial stress (CCCP), CHCHD2 and CHCHD10 translocate to the cytosol and interact with eIF2α, attenuating mtISR over-activation by suppressing eIF2α phosphorylation.","method":"Co-immunoprecipitation (CHCHD2/CHCHD10 with OMA1 and eIF2α), OMA1 activity assay, eIF2α phosphorylation assay, subcellular fractionation after CCCP treatment, CHCHD2/CHCHD10 knockdown","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with OMA1 and eIF2α, OMA1 activity assay, stress-induced translocation; single lab with multiple methods","pmids":["35173147"],"is_preprint":false},{"year":2023,"finding":"CHCHD2 T61I mutant protein mislocalizes to the cytosol in Neuro2a cells and recruits casein kinase 1ε/δ (Csnk1e/d), which then phosphorylates neurofilament and α-synuclein, forming cytosolic aggresomes. A Csnk1e/d inhibitor suppresses this phosphorylation and improves neurodegeneration phenotypes in Chchd2 T61I mice.","method":"Fluorescence microscopy (T61I mislocalization), co-immunoprecipitation (CHCHD2/Csnk1e/d), phospho-α-synuclein assay, aggresome quantification, in vivo T61I knock-in and transgenic mice, pharmacologic Csnk1e/d inhibitor rescue in mice and iPSC-derived neurons","journal":"EMBO molecular medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP, in vivo genetic models (KI + transgenic), pharmacologic rescue, multiple orthogonal readouts; replicated in patient brain tissue","pmids":["37578019"],"is_preprint":false},{"year":2024,"finding":"CHCHD2 deficiency reduces α-ketoglutarate dehydrogenase (KGDH) complex protein levels in mouse brain and human dopaminergic neurons, leading to elevated α-ketoglutarate and increased lipid peroxidation. Treatment with lipoic acid (a KGDH cofactor/antioxidant) reduces lipid peroxidation and phosphorylated α-synuclein in CHCHD2-deficient neurons. This KGDH pathway effect is specific to CHCHD2 and not CHCHD10.","method":"Unbiased metabolomics of purified mitochondria, KGDH protein quantification in KO mouse brain and iPSC-derived dopaminergic neurons, lipoic acid treatment with lipid peroxidation and p-α-synuclein assay, CHCHD10 KO comparison","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — unbiased metabolomics, multiple model systems (mouse brain + human neurons), orthogonal pharmacologic rescue, CHCHD10 specificity control","pmids":["40011434"],"is_preprint":false},{"year":2024,"finding":"CHCHD2 binds near helix IX of COX (exposed in the IMS) and induces structural changes around the heme sites, particularly around helix X (located between both hemes), thereby accelerating proton uptake in the reduced state for proton pumping.","method":"Visible resonance Raman spectroscopy of purified COX in reduced and CO-bound states with and without CHCHD2 binding","journal":"Journal of inorganic biochemistry","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — structural/spectroscopic method with purified proteins, but single lab and single method; no mutagenesis validation of the specific helix contacts","pmids":["39094247"],"is_preprint":false},{"year":2024,"finding":"CHCHD2 interacts with F1F0-ATPase (confirmed by mass spectrometry and co-immunoprecipitation), and wild-type CHCHD2 overexpression promotes F1F0-ATPase assembly. The T61I mutant has lost the ability to regulate F1F0-ATPase assembly, contributing to mitochondrial dysfunction in a PD cell model.","method":"Mass spectrometry, co-immunoprecipitation (CHCHD2/F1F0-ATPase), BN-PAGE for ATPase assembly, overexpression of WT vs. T61I in MPP+-treated SH-SY5Y cells, in vivo MPTP mouse model with AAV-T61I","journal":"Neural regeneration research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — MS-confirmed interaction, Co-IP, BN-PAGE assembly assay; single lab with multiple methods","pmids":["37488867"],"is_preprint":false},{"year":2022,"finding":"CHCHD2 interacts with Mic10 (a MICOS component) as shown by co-immunoprecipitation; overexpression of CHCHD2 protects against MPP+-induced MICOS impairment, while CHCHD2 knockdown destabilizes MICOS. CHCHD2 overexpression protects against MPP+-induced mitochondrial dysfunction and inhibits dopaminergic neuron loss in an MPTP mouse model.","method":"Co-immunoprecipitation (CHCHD2/Mic10), BN-PAGE, 2D-SDS-PAGE for MICOS stability, AAV-mediated CHCHD2 overexpression in MPTP mice with dopaminergic neuron counting","journal":"Chinese medical journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, BN-PAGE, in vivo mouse rescue; single lab with multiple orthogonal methods","pmids":["35830185"],"is_preprint":false},{"year":2024,"finding":"C1QBP (a mitochondrial protein) regulates the stability of CHCHD2 and CHCHD10 proteins and maintains the integrity of a C1QBP/CHCHD2/CHCHD10 ternary complex. CHCHD2 deficiency leads to decreased neural cell viability and mitochondrial structural and functional impairment with upregulated autophagy under cellular stress.","method":"Co-immunoprecipitation (C1QBP/CHCHD2/CHCHD10 complex), CHCHD2 deficiency models (siRNA and in vivo), mitochondrial function assays, autophagy/mitophagy quantification, cell viability assay","journal":"Molecular neurobiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP for ternary complex, multiple functional readouts; single lab","pmids":["38453793"],"is_preprint":false},{"year":2023,"finding":"CHCHD2 acts as a repressive transcription factor at the RNase H1 promoter to inhibit RNase H1 expression and promote R-loop accumulation. Sirt1 deacetylates CHCHD2 and acts as a co-repressor, enhancing CHCHD2-mediated suppression of RNase H1 transcription. G9a methylase prevents CHCHD2/Sirt1 recruitment to the RNase H1 promoter.","method":"ChIP assay (CHCHD2/Sirt1 at RNase H1 promoter), co-immunoprecipitation (CHCHD2/Sirt1), gene expression assays after CHCHD2 knockdown/G9a knockdown, R-loop quantification","journal":"Cell insight","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP, Co-IP, functional gene expression assay; single lab with multiple methods","pmids":["37388553"],"is_preprint":false},{"year":2024,"finding":"HIF2α binds the CHCHD2 (MNRR1) promoter and inhibits transcription by competing with the transcriptional activator RBPJκ. In MELAS cells a pseudohypoxic state stabilizes HIF2α (via reduced PHD3), thereby reducing CHCHD2 levels.","method":"ChIP assay (HIF2α at MNRR1 promoter), promoter competition assay (HIF2α vs. RBPJκ), PHD3 quantification in MELAS cybrids, HIF2α knockdown/stabilization experiments","journal":"Cells","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP, promoter competition assay, disease cell model; single lab","pmids":["40710331"],"is_preprint":false},{"year":2026,"finding":"CHCHD2 transcriptional activation requires interaction with RBPJκ and recruitment of the co-activator p300 to the ORE promoter element. A minimal domain of CHCHD2 is sufficient for nuclear function, and peptides based on this domain can activate transcription by enhancing p300-RBPJκ interaction.","method":"Co-immunoprecipitation (CHCHD2/RBPJκ/p300), domain deletion analysis, peptide-based activation assay, downstream pathway (UPRmt, biogenesis) activation in MELAS model","journal":"Mitochondrion","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, minimal domain mapping, functional assay with downstream readouts; single lab","pmids":["41592630"],"is_preprint":false},{"year":2026,"finding":"CHCHD2 and CHCHD10 form a complex with C1QBP/p32 and ATG8-family proteins (preferentially GABARAPs). Through GABARAP binding, CHCHD2/CHCHD10 undergo autophagic degradation and recruit the ULK1 complex to activate autophagy initiation. CHCHD2 promotes clearance of toxic α-synuclein species and reduces protein aggregates.","method":"Co-immunoprecipitation of CHCHD2-CHCHD10-C1QBP-ATG8 complex, ATG8 binding specificity assay (GABARAPs vs. LC3s), ULK1 complex recruitment assay, autophagy initiation assay in CHCHD2 KO iPSC-derived neurons, α-synuclein aggregate quantification in mouse striatum","journal":"Autophagy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP for complex, iPSC-derived KO neurons, in vivo α-synuclein assay; single lab but multiple orthogonal methods","pmids":["42183628"],"is_preprint":false},{"year":2024,"finding":"Loss of CHCHD2 epigenetically (by promoter methylation) attenuates Rho-associated protein kinase (ROCK) activity in human pluripotent stem cells, conferring resistance to single-cell dissociation-induced death during in vitro culture.","method":"Transcriptome and methylome analysis, CHCHD2 knockdown and reconstitution in hESCs, ROCK activity assay, cell survival assay under enzymatic dissociation","journal":"Cellular and molecular life sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic perturbation and reconstitution, functional ROCK activity assay; single lab with multiple methods","pmids":["38214772"],"is_preprint":false},{"year":2025,"finding":"CHCHD2 T61I knock-in mice show pronounced mitochondrial disruption (distorted ultrastructure and CHCHD2 aggregation) in substantia nigra dopaminergic neurons, disrupted mitochondrial protein-protein interactions, a whole-body metabolic shift toward glycolysis, elevated mitochondrial ROS, and progressive α-synuclein aggregation. In idiopathic PD, CHCHD2 protein accumulates in early Lewy aggregates, linking CHCHD2 accumulation to α-synuclein pathology.","method":"CRISPR knock-in T61I mice, immune-electron microscopy, spatial genomics, proteomics (mitochondrial PPI), metabolic phenotyping (RER), α-synuclein aggregation assay, human PD brain immunofluorescence","journal":"Science advances","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo genetic knock-in model with multiple orthogonal methods (EM, proteomics, metabolomics, human tissue validation)","pmids":["41237231"],"is_preprint":false},{"year":2022,"finding":"Loss of CHCHD2 in zebrafish impairs Complex I assembly and causes motor impairment, reduced survival, and compromised neuromuscular junction integrity. However, in chchd2/chchd10 double KO zebrafish, Complex I is paradoxically restored and the mt-ISR is activated, suggesting that mt-ISR activation can compensate for the Complex I defect seen in single KOs.","method":"Zebrafish CRISPR knockout (chchd2-/-, chchd10-/-, double KO), Complex I assembly assay (BN-PAGE), behavioral motor assay, neuromuscular junction staining, mt-ISR transcriptional marker assay","journal":"Developmental neurobiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo KO model, BN-PAGE complex assembly assay, genetic epistasis with double KO; single lab","pmids":["36799027"],"is_preprint":false},{"year":2022,"finding":"CHCHD2 and CHCHD10 exist exclusively as a high-molecular-weight complex in mouse tissues in vivo; this complex increases in abundance and size in response to mitochondrial dysfunction across different tissues. Loss of CHCHD2 does not abolish CHCHD10 oligomerization but enhances cell vulnerability to mitochondrial stress. CHCHD2 KO mice display impaired motor capacity, reduced striatal dopamine levels, and lipid homeostasis disruption in the brain.","method":"Whole-body Chchd2 KO mice, BN-PAGE, mitochondrial stress induction, motor behavior assay, dopamine quantification, lipidomics","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo KO mouse, BN-PAGE, lipidomics, multiple tissue analyses; single lab","pmids":["41053020"],"is_preprint":false},{"year":2026,"finding":"CHCHD2 knockdown markedly reduces expression of mtUPR-related proteins (HSPA9, HSPD1, YME1L1, CLPP) in an MPP+-induced PD cell model, and the mtUPR activation by CHCHD2 involves the JNK/c-Jun and AKT/ERα pathways.","method":"shRNA knockdown of CHCHD2 in MPP+-treated SH-SY5Y cells, Western blot for mtUPR proteins, JNK and AKT agonist treatment, electron microscopy of mitochondrial morphology","journal":"ACS chemical neuroscience","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, shRNA knockdown with protein quantification, pharmacological agonists without genetic epistasis confirmation","pmids":["41640382"],"is_preprint":false},{"year":2015,"finding":"CHCHD2 promotes cell migration and regulates mitochondrial respiration in NSCLC cells. Protein-protein interaction mapping identified C1QBP (mitochondrial hub) and YBX1 (oncogenic transcription factor) as CHCHD2 interactors by affinity purification mass spectrometry and proximity ligation.","method":"CHCHD2 knockdown in NSCLC cells (migration assay, proliferation assay, oxygen consumption), affinity purification mass spectrometry, proximity ligation assay","journal":"Molecular cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — AP-MS for interactome, functional knockdown assay; single lab with two orthogonal interaction methods","pmids":["25784717"],"is_preprint":false},{"year":2022,"finding":"CHCHD2 acts as a nuclear transcription factor in NASH liver; ChIP-seq identified CHCHD2 target genes enriched in NAFLD pathways. CHCHD2 promotes liver fibrosis via Notch signaling by up-regulating osteopontin in hepatocytes, which activates hepatic stellate cells. LPS-induced CHCHD2 expression in hepatocytes is dependent on YAP/TAZ-TEAD.","method":"ChIP sequencing (CHCHD2 target genes), hepatocyte-specific CHCHD2 overexpression/knockout mice, Notch inhibition rescue, osteopontin quantification, YAP/TAZ inhibitor (verteporfin) treatment","journal":"JCI insight","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP-seq, in vivo conditional OE/KO models, pathway rescue; single lab with multiple methods","pmids":["36477358"],"is_preprint":false},{"year":2025,"finding":"In MASH liver, CHCHD2 protein degradation is primarily mediated by the mitochondrial protease ClpXP, which is repressed in MASH. Elevated CHCHD2 promotes VEGFA transcription (identified by ChIP-seq) in hepatocytes, leading to increased angiogenic activity and supporting HCC growth.","method":"CHCHD2 ChIP-seq, Chchd2 KO mice, AAV-mediated hepatocyte-specific CHCHD2 OE, ClpXP protease assay, VEGFA expression and angiogenesis assay, orthotopic HCC mouse model","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP-seq, in vivo KO and OE models, protease identification; single lab with multiple methods","pmids":["40025232"],"is_preprint":false}],"current_model":"CHCHD2 (MNRR1) is a bi-organellar mitochondrial IMS protein that, in mitochondria, directly binds and activates cytochrome c oxidase (Complex IV) via Abl2-mediated phosphorylation at Tyr-99, stabilizes OPA1 by competing with P32 for YME1L binding, maintains MICOS cristae integrity through interaction with Mic10, forms a partially redundant high-molecular-weight heterodimeric complex with CHCHD10 required for efficient respiration, interacts with Bcl-xL to suppress Bax-driven apoptosis, and binds cytochrome c with MICS1 to modulate cell death signaling; in the nucleus it functions as a transcription factor at an 8-bp oxygen-responsive element (ORE) in complex with RBPJκ and p300, activating hypoxia-responsive genes (including COX4I2) and regulating UPRmt via ATF5; the PD-linked T61I mutation causes IMS protein precipitation with dominant-negative effects on wild-type CHCHD2, cytosolic mislocalization, recruitment of Csnk1e/d kinase to phosphorylate α-synuclein, impaired F1F0-ATPase assembly, and reduced KGDH activity leading to lipid peroxidation and α-synuclein aggregation."},"narrative":{"mechanistic_narrative":"CHCHD2 (MNRR1) is a bi-organellar regulator of mitochondrial bioenergetics and stress signaling that functions both as an intermembrane-space respiratory effector and as a nuclear transcription factor [PMID:25315652]. Imported into the IMS via the Mia40 pathway through cysteines of its C-terminal CHCH domain, it binds directly to cytochrome c oxidase (Complex IV) and is required for full COX activity, membrane potential, and respiration [PMID:25315652, PMID:32068847]; binding near helix IX of COX induces structural changes around the heme sites that accelerate proton uptake [PMID:39094247], and Abl2/ARG-mediated phosphorylation at Tyr-99 promotes its COX association and stimulates respiration [PMID:27913209]. CHCHD2 partners with CHCHD10 in a high-molecular-weight heterodimeric complex required for efficient respiration and Complex I assembly, the two proteins being partially redundant in vivo [PMID:29121267, PMID:30084972, PMID:41053020]. CHCHD2 maintains cristae architecture through interaction with the MICOS component Mic10 and, together with CHCHD10, restrains the stress peptidase OMA1 to prevent L-OPA1 cleavage and aberrant cristae remodeling [PMID:32338760, PMID:35173147, PMID:35830185]; in Drosophila it stabilizes Opa1 by displacing P32 from the YME1L protease [PMID:31907391]. It suppresses apoptosis by binding Bcl-xL to block Bax oligomerization and MOMP, and modulates cell death together with cytochrome c and MICS1 [PMID:25476776, PMID:28589937]. In the nucleus, CHCHD2 binds an oxygen-responsive element (ORE) with RBPJκ and the co-activator p300 to activate hypoxia-responsive and mitochondrial-recovery genes including COX4I2, and drives the mitochondrial unfolded protein response upstream of ATF5 [PMID:25315652, PMID:33257573, PMID:41592630]. The Parkinson's-disease-linked T61I mutation precipitates within the IMS with dominant-negative effects on wild-type CHCHD2, mislocalizes to the cytosol where it recruits casein kinase 1ε/δ to phosphorylate α-synuclein, and impairs F1F0-ATPase assembly [PMID:32068847, PMID:37578019, PMID:37488867]; CHCHD2 deficiency lowers α-ketoglutarate dehydrogenase, driving lipid peroxidation and α-synuclein aggregation, establishing a direct mechanistic link to neurodegeneration [PMID:40011434, PMID:41237231].","teleology":[{"year":2014,"claim":"Established CHCHD2 as a dual-function protein: an IMS effector required for Complex IV activity and a hypoxia-responsive nuclear transcription factor, defining its bi-organellar nature.","evidence":"Subcellular fractionation, Co-IP with COX, respiration assays, promoter-reporter and ChIP under normoxia vs. hypoxia","pmids":["25315652"],"confidence":"High","gaps":["Molecular signal switching import vs. nuclear retention not fully resolved","Direct DNA-binding mode at the ORE not structurally defined"]},{"year":2014,"claim":"Showed CHCHD2 acts as an anti-apoptotic guardian at mitochondria, answering how it couples bioenergetics to cell-death control.","evidence":"Reciprocal Co-IP with Bcl-xL, Bax oligomerization, cytochrome c release and MOMP assays","pmids":["25476776"],"confidence":"High","gaps":["Whether Bcl-xL binding is direct or bridged not resolved","Quantitative contribution to apoptosis in vivo unclear"]},{"year":2015,"claim":"Linked CHCHD2 to a broader interactome (C1QBP, YBX1) and a pro-migratory role in cancer cells, extending function beyond classical mitochondrial biology.","evidence":"AP-MS and proximity ligation interactome mapping with knockdown migration/respiration assays in NSCLC","pmids":["25784717"],"confidence":"Medium","gaps":["Direct vs. indirect nature of YBX1 interaction unproven","Mechanism connecting respiration to migration not defined"]},{"year":2016,"claim":"Identified the post-translational control of COX binding through Abl2/ARG phosphorylation at Tyr-99, mechanizing how respiration is tuned and how a disease mutation impairs it.","evidence":"Site-directed mutagenesis, in vitro kinase assay, Co-IP with Abl2 and COX, oxygen consumption","pmids":["27913209"],"confidence":"High","gaps":["Phosphatase that reverses Y99 not identified","Stoichiometry of phospho-CHCHD2 in vivo unknown"]},{"year":2016,"claim":"Revealed a non-respiratory developmental role: CHCHD2 sequesters SMAD4 at mitochondria to suppress TGFβ signaling and prime neuroectodermal differentiation.","evidence":"Co-IP, fractionation, TGFβ reporter assay, differentiation readout in pluripotent stem cells","pmids":["27810911"],"confidence":"Medium","gaps":["Single lab without reciprocal in vivo validation","How mitochondrial sequestration is regulated unclear"]},{"year":2017,"claim":"Confirmed cytochrome c/MICS1 partnership and demonstrated, in an in vivo dopaminergic model, that PD mutants fail to rescue CHCHD2 loss, tying the gene to neurodegeneration.","evidence":"Co-IP, Drosophila KO/rescue with WT vs. mutant human CHCHD2, EM, neuron counting","pmids":["28589937"],"confidence":"High","gaps":["Mammalian relevance of MICS1 interaction not directly shown","Mechanism of mutant loss-of-function not dissected here"]},{"year":2018,"claim":"Defined the CHCHD2–CHCHD10 heterodimeric complex as the functional respiratory unit and showed ALS-linked CHCHD10 variants destabilize it, unifying two disease genes mechanistically.","evidence":"Reciprocal Co-IP, BN-PAGE, respiration assays in patient fibroblasts, KO cell lines, IF co-localization","pmids":["29121267","30084972"],"confidence":"High","gaps":["Stoichiometry and structure of the ~220 kDa complex undefined","How the complex is distributed across cristae not mechanized"]},{"year":2018,"claim":"Showed CHCHD10 scaffolds CHCHD2 phosphorylation by ARG and that nuclear CHCHD10 opposes CHCHD2 at ORE genes via CXXC5, revealing reciprocal regulation.","evidence":"Co-purification with COX, Co-IP of CHCHD10/CHCHD2/ARG, COX activity and gene expression assays","pmids":["29540477"],"confidence":"Medium","gaps":["Direct vs. indirect scaffolding of the kinase unresolved","Generality of CXXC5 repression across ORE genes unknown"]},{"year":2019,"claim":"Connected PD-associated CHCHD2 mutations to MICOS disruption and cristae collapse, mechanizing the structural consequence of disease alleles.","evidence":"Isogenic CRISPR hESC lines, STED super-resolution, Co-IP, EM of cristae","pmids":["30496485"],"confidence":"High","gaps":["Direct MICOS subunit contacts not mapped","Whether cristae loss is cause or consequence of respiratory defect unclear"]},{"year":2020,"claim":"Established that CHCHD2/CHCHD10 loss activates OMA1 to cleave L-OPA1, identifying the protease axis that links the complex to cristae and fusion control.","evidence":"DKO and mutant CHCHD10 knock-in mice, OMA1 activity and OPA1 cleavage immunoblots, EM","pmids":["32338760"],"confidence":"High","gaps":["Direct OMA1 binding shown later; activation mechanism not fully defined here","Tissue specificity of redundancy not characterized"]},{"year":2020,"claim":"Identified the YME1L/P32 competition mechanism by which CHCHD2 stabilizes OPA1 and controls mitochondrial morphology.","evidence":"Drosophila KO, Co-IP with P32 and YME1L, protease activity assay, genetic epistasis","pmids":["31907391"],"confidence":"High","gaps":["Conservation of the P32/YME1L mechanism in mammals not confirmed here","Quantitative balance between YME1L and OMA1 axes unclear"]},{"year":2020,"claim":"Defined the molecular pathology of the T61I mutation: IMS precipitation with dominant-negative aggregation of wild-type protein, and mapped CHCH-domain cysteines as the true mitochondrial targeting determinant.","evidence":"Fractionation, detergent solubility assays, cysteine mutagenesis, live-cell imaging, ROS/apoptosis assays","pmids":["32068847"],"confidence":"High","gaps":["Structural basis of aggregation not determined","Why T61I specifically destabilizes the fold not resolved"]},{"year":2020,"claim":"Showed CHCHD2's nuclear transcription function drives UPRmt, autophagy, and biogenesis to rescue mitochondrial disease, placing it upstream of ATF5.","evidence":"Overexpression in MELAS cybrids, UPRmt/autophagy/biogenesis markers, ATF5 quantification in KO cells","pmids":["33257573"],"confidence":"High","gaps":["Whether CHCHD2 directly transactivates ATF5 not shown","Relative contribution of nuclear vs. mitochondrial pools to rescue unclear"]},{"year":2022,"claim":"Demonstrated direct OMA1 binding and stress-induced cytosolic translocation where CHCHD2/CHCHD10 engage eIF2α to restrain mtISR over-activation.","evidence":"Co-IP with OMA1 and eIF2α, OMA1 activity assay, eIF2α phosphorylation, fractionation after CCCP","pmids":["35173147"],"confidence":"Medium","gaps":["Direct vs. indirect eIF2α interaction not fully established","Single lab without reciprocal validation"]},{"year":2022,"claim":"Identified Mic10 as a CHCHD2 MICOS partner and showed CHCHD2 overexpression protects against toxin-induced MICOS impairment and neuron loss.","evidence":"Co-IP with Mic10, BN-PAGE/2D-SDS-PAGE for MICOS stability, AAV overexpression in MPTP mice","pmids":["35830185"],"confidence":"Medium","gaps":["Direct binding interface with Mic10 not mapped","Single lab"]},{"year":2022,"claim":"Showed in zebrafish that single CHCHD2 loss impairs Complex I and neuromuscular function but double KO restores Complex I via mt-ISR, revealing a compensatory stress response.","evidence":"CRISPR single and double KO zebrafish, BN-PAGE Complex I assembly, motor and NMJ assays","pmids":["36799027"],"confidence":"Medium","gaps":["Mechanism of mt-ISR-mediated Complex I restoration not defined","Single model organism"]},{"year":2022,"claim":"Extended CHCHD2's nuclear role to liver disease, showing it drives fibrosis via Notch/osteopontin and is induced through YAP/TAZ-TEAD.","evidence":"ChIP-seq, hepatocyte-specific OE/KO mice, Notch inhibition rescue, verteporfin treatment","pmids":["36477358"],"confidence":"Medium","gaps":["Direct target genes vs. indirect effects not fully separated","Connection to mitochondrial function in liver unclear"]},{"year":2023,"claim":"Mechanized the T61I gain-of-function in neurodegeneration: cytosolic mislocalization recruits CK1ε/δ to phosphorylate α-synuclein, and kinase inhibition rescues phenotypes.","evidence":"Co-IP with Csnk1e/d, phospho-α-synuclein and aggresome assays, T61I KI/transgenic mice, inhibitor rescue in mice and iPSC neurons","pmids":["37578019"],"confidence":"High","gaps":["How mislocalized CHCHD2 recruits the kinase mechanistically unclear","Generality across other CHCHD2 mutants not tested"]},{"year":2023,"claim":"Revealed a genome-stability role: CHCHD2 represses RNase H1 transcription with Sirt1 as co-repressor, promoting R-loop accumulation.","evidence":"ChIP and Co-IP with Sirt1, gene expression after CHCHD2/G9a knockdown, R-loop quantification","pmids":["37388553"],"confidence":"Medium","gaps":["Physiological context of R-loop regulation unclear","Single lab without orthogonal validation"]},{"year":2024,"claim":"Provided spectroscopic evidence for how CHCHD2 binding remodels COX heme architecture to accelerate proton uptake, mechanizing its respiratory activation.","evidence":"Visible resonance Raman spectroscopy of purified COX with and without CHCHD2","pmids":["39094247"],"confidence":"Medium","gaps":["No mutagenesis validation of the proposed helix contacts","Single method, single lab"]},{"year":2024,"claim":"Defined a CHCHD2-specific metabolic axis: deficiency lowers KGDH, raising α-ketoglutarate and lipid peroxidation, with lipoic acid rescuing p-α-synuclein.","evidence":"Unbiased mitochondrial metabolomics, KGDH quantification in KO mouse brain and iPSC neurons, lipoic acid rescue, CHCHD10 KO control","pmids":["40011434"],"confidence":"High","gaps":["How CHCHD2 loss lowers KGDH protein not mechanized","Link between α-KG elevation and lipid peroxidation not fully traced"]},{"year":2024,"claim":"Identified CHCHD2 regulation of F1F0-ATPase assembly and the T61I loss of this function in PD cell and mouse models.","evidence":"MS and Co-IP with F1F0-ATPase, BN-PAGE assembly, WT vs. T61I in MPP+ cells, MPTP/AAV mouse model","pmids":["37488867"],"confidence":"Medium","gaps":["Direct binding interface with ATPase subunits unmapped","Single lab"]},{"year":2024,"claim":"Placed CHCHD2 in a C1QBP/CHCHD2/CHCHD10 ternary complex regulating protein stability and neural cell viability under stress.","evidence":"Co-IP of ternary complex, CHCHD2 deficiency models, mitochondrial function and autophagy assays","pmids":["38453793"],"confidence":"Medium","gaps":["Architecture and stoichiometry of ternary complex unknown","Single lab"]},{"year":2024,"claim":"Showed CHCHD2 loss in pluripotent stem cells epigenetically attenuates ROCK activity, conferring dissociation resistance, broadening its regulatory reach.","evidence":"Transcriptome/methylome analysis, knockdown/reconstitution, ROCK activity and survival assays in hESCs","pmids":["38214772"],"confidence":"Medium","gaps":["Mechanistic link between CHCHD2 and ROCK indirect","Single lab"]},{"year":2024,"claim":"Identified HIF2α as a repressor of the CHCHD2 promoter via RBPJκ competition, mechanizing pseudohypoxic CHCHD2 loss in MELAS.","evidence":"ChIP, HIF2α vs. RBPJκ promoter competition assay, PHD3 quantification in MELAS cybrids","pmids":["40710331"],"confidence":"Medium","gaps":["Generality across cell types not established","Single lab"]},{"year":2025,"claim":"Demonstrated in MASH liver that ClpXP-mediated degradation controls CHCHD2 levels and that elevated CHCHD2 drives VEGFA-dependent angiogenesis supporting HCC.","evidence":"ChIP-seq, KO and hepatocyte-specific OE mice, ClpXP protease assay, orthotopic HCC model","pmids":["40025232"],"confidence":"Medium","gaps":["Direct ClpXP recognition motif on CHCHD2 not defined","Mitochondrial vs. nuclear pool driving VEGFA unclear"]},{"year":2025,"claim":"Comprehensively characterized the T61I knock-in mouse, linking IMS aggregation, glycolytic metabolic shift, and α-synuclein pathology to human Lewy aggregate accumulation.","evidence":"CRISPR T61I KI mice, immuno-EM, spatial genomics, mitochondrial proteomics, metabolic phenotyping, human PD brain IF","pmids":["41237231"],"confidence":"High","gaps":["Temporal sequence of metabolic shift vs. aggregation not resolved","Whether CHCHD2 accumulation initiates or follows Lewy pathology unclear"]},{"year":2026,"claim":"Mapped the nuclear transactivation mechanism to RBPJκ binding and p300 recruitment at the ORE, with a minimal peptide sufficient to activate transcription.","evidence":"Co-IP of CHCHD2/RBPJκ/p300, domain deletion, peptide activation assay, downstream UPRmt/biogenesis readouts in MELAS","pmids":["41592630"],"confidence":"Medium","gaps":["Structural basis of CHCHD2-RBPJκ-p300 assembly undefined","Single lab"]},{"year":2026,"claim":"Revealed an autophagy-regulatory function: CHCHD2/CHCHD10 with C1QBP bind GABARAPs to recruit ULK1 and initiate autophagy, promoting α-synuclein clearance.","evidence":"Co-IP of CHCHD2-CHCHD10-C1QBP-ATG8 complex, ATG8 specificity, ULK1 recruitment, autophagy in KO iPSC neurons, α-synuclein assay","pmids":["42183628"],"confidence":"Medium","gaps":["Whether autophagy role is mitochondria-localized or cytosolic unclear","Single lab"]},{"year":2026,"claim":"Reported that CHCHD2 knockdown reduces mtUPR proteins via JNK/c-Jun and AKT/ERα pathways in a PD cell model.","evidence":"shRNA knockdown in MPP+-treated SH-SY5Y, Western blot, JNK/AKT agonist treatment, EM","pmids":["41640382"],"confidence":"Low","gaps":["Pharmacological agonists used without genetic epistasis confirmation","Single lab, single cell model"]},{"year":null,"claim":"How the bi-organellar partition of CHCHD2 is dynamically controlled and how its mitochondrial structural/respiratory roles mechanistically converge with its nuclear transcriptional program to determine neuronal vulnerability remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model linking respiratory, cristae, and transcriptional functions","Structure of the CHCHD2/CHCHD10 complex undefined","Causal hierarchy among bioenergetic, metabolic, and aggregation defects in disease unclear"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[1,12,21,23,31,32]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[1,21,23]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,2,14,17,19]},{"term_id":"GO:0140313","term_label":"molecular sequestering activity","supporting_discovery_ids":[13]}],"localization":[{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[0,8,9,19]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[1,12,21,23]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[11,14,15]}],"pathway":[{"term_id":"R-HSA-8953897","term_label":"Cellular responses to stimuli","supporting_discovery_ids":[9,12,14]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[2,4]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[1,23,31]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[24]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[11,15,16,26]}],"complexes":["CHCHD2-CHCHD10 heterodimeric complex","MICOS","C1QBP/CHCHD2/CHCHD10 ternary complex","Cytochrome c oxidase (Complex IV) association"],"partners":["CHCHD10","COX (CYTOCHROME C OXIDASE)","OMA1","YME1L","C1QBP","MIC10","RBPJ","BCL-XL"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9Y6H1","full_name":"Coiled-coil-helix-coiled-coil-helix domain-containing protein 2","aliases":["Aging-associated gene 10 protein","HCV NS2 trans-regulated protein","NS2TP"],"length_aa":151,"mass_kda":15.5,"function":"Transcription factor. Binds to the oxygen responsive element of COX4I2 and activates its transcription under hypoxia conditions (4% oxygen), as well as normoxia conditions (20% oxygen) (PubMed:23303788)","subcellular_location":"Nucleus; Mitochondrion; Mitochondrion intermembrane space","url":"https://www.uniprot.org/uniprotkb/Q9Y6H1/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/CHCHD2","classification":"Common Essential","n_dependent_lines":820,"n_total_lines":1208,"dependency_fraction":0.6788079470198676},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/CHCHD2","total_profiled":1310},"omim":[{"mim_id":"616710","title":"PARKINSON DISEASE 22, AUTOSOMAL DOMINANT; PARK22","url":"https://www.omim.org/entry/616710"},{"mim_id":"616244","title":"COILED-COIL-HELIX-COILED-COIL-HELIX DOMAIN-CONTAINING PROTEIN 2; CHCHD2","url":"https://www.omim.org/entry/616244"},{"mim_id":"612752","title":"CXXC FINGER PROTEIN 5; CXXC5","url":"https://www.omim.org/entry/612752"},{"mim_id":"607976","title":"CYTOCHROME c OXIDASE, SUBUNIT 4I2; COX4I2","url":"https://www.omim.org/entry/607976"},{"mim_id":"602933","title":"THYROID HORMONE RECEPTOR INTERACTOR 6; TRIP6","url":"https://www.omim.org/entry/602933"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Mitochondria","reliability":"Supported"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/CHCHD2"},"hgnc":{"alias_symbol":["MIX17B","MNRR1"],"prev_symbol":["C7orf17"]},"alphafold":{"accession":"Q9Y6H1","domains":[{"cath_id":"1.10.287","chopping":"113-147","consensus_level":"high","plddt":88.8423,"start":113,"end":147}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9Y6H1","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9Y6H1-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9Y6H1-F1-predicted_aligned_error_v6.png","plddt_mean":62.91},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CHCHD2","jax_strain_url":"https://www.jax.org/strain/search?query=CHCHD2"},"sequence":{"accession":"Q9Y6H1","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9Y6H1.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9Y6H1/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9Y6H1"}},"corpus_meta":[{"pmid":"25662902","id":"PMC_25662902","title":"CHCHD2 mutations in autosomal dominant late-onset Parkinson's disease: a genome-wide linkage and sequencing study.","date":"2015","source":"The Lancet. 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Mia40-mediated pathway, where it binds directly to cytochrome c oxidase (COX/Complex IV), and this association is required for full COX activity. Loss of CHCHD2 reduces COX activity, membrane potential, and growth rate while increasing ROS and mitochondrial fragmentation.\",\n      \"method\": \"Subcellular fractionation, co-immunoprecipitation with COX, functional respiration assays, knockdown with defined phenotypic readouts\",\n      \"journal\": \"Mitochondrion\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal binding demonstrated, direct functional assay (COX activity), multiple orthogonal methods in one study, independently replicated in subsequent papers\",\n      \"pmids\": [\"25315652\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"In the nucleus, CHCHD2 (MNRR1) functions as a transcription factor that binds a novel oxygen-responsive element (ORE) in the promoter of COX4I2 (and itself) to stimulate transcription under hypoxia (4% oxygen). During stress, import into mitochondria is blocked, causing nuclear accumulation and enhanced transcriptional activity.\",\n      \"method\": \"Promoter-reporter assays, chromatin immunoprecipitation (ChIP), subcellular fractionation under normoxic vs. hypoxic conditions, knockdown/overexpression\",\n      \"journal\": \"Mitochondrion\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP plus reporter assay plus fractionation, replicated in multiple subsequent studies by the same and independent groups\",\n      \"pmids\": [\"25315652\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"CHCHD2 binds to Bcl-xL at the mitochondria and inhibits mitochondrial accumulation and oligomerization of Bax, thereby suppressing mitochondrial outer membrane permeabilization (MOMP) and apoptosis. CHCHD2 levels decrease prior to MOMP in response to apoptotic stimuli, and its absence attenuates Bcl-xL's ability to block Bax activation.\",\n      \"method\": \"Co-immunoprecipitation (CHCHD2/Bcl-xL), overexpression and knockdown with Bax oligomerization assay, cytochrome c release assay, MOMP assay\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP, multiple functional assays (MOMP, Bax oligomerization, cytochrome c release), single lab but orthogonal methods\",\n      \"pmids\": [\"25476776\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Phosphorylation of CHCHD2 (MNRR1) at tyrosine-99 by Abl2 kinase (ARG) inside mitochondria promotes its binding to COX and stimulates respiration. A disease-associated Q112H mutation impairs interaction with Abl2, leading to defective tyrosine phosphorylation and reduced respiration.\",\n      \"method\": \"Site-directed mutagenesis (Y99 phosphorylation site), in vitro kinase assay, Co-IP of CHCHD2 with Abl2 and COX, oxygen consumption assay\",\n      \"journal\": \"Biochimica et biophysica acta. Molecular cell research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — mutagenesis plus kinase assay plus functional respiration readout in one study, single lab\",\n      \"pmids\": [\"27913209\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"CHCHD2 binds cytochrome c together with MICS1 (a Bax inhibitor-1 superfamily member) to modulate cell death signalling. Loss of CHCHD2 in Drosophila disrupts mitochondrial matrix/crista structures, impairs oxygen respiration, causes oxidative stress, and leads to dopaminergic neuron loss; these phenotypes are rescued by human CHCHD2 but not by PD-associated mutants.\",\n      \"method\": \"Co-immunoprecipitation (CHCHD2/cytochrome c/MICS1), Drosophila CHCHD2 knockout/overexpression, electron microscopy, oxygen consumption assay, dopaminergic neuron counting, genetic rescue with human WT vs. mutant CHCHD2\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP, in vivo genetic model with neuron counting, multiple orthogonal methods, genetic rescue experiment distinguishing WT from mutant\",\n      \"pmids\": [\"28589937\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"CHCHD2 and CHCHD10 form a high-molecular-weight (~220 kDa) heterodimeric complex required for efficient mitochondrial respiration. The ALS-linked CHCHD10 p.R15L variant destabilizes CHCHD10, abolishes this complex, and impairs Complex I assembly and cellular respiration.\",\n      \"method\": \"Reciprocal co-immunoprecipitation (CHCHD2/CHCHD10), blue-native PAGE, oxygen consumption assay in patient fibroblasts, galactose proliferation assay\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — quantitative immunoprecipitation, BN-PAGE, functional respiration assay, patient material; replicated in subsequent structural analyses\",\n      \"pmids\": [\"29121267\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"CHCHD2 accumulates preferentially in distressed mitochondria (upon loss of membrane potential), while CHCHD10 oligomerization depends on CHCHD2 expression. CHCHD2 and CHCHD10 form heterodimers distributed throughout mitochondrial cristae; disease-causing mutations in either protein can still form heterodimers.\",\n      \"method\": \"CHCHD2/CHCHD10 double knockout cell lines, Blue-native PAGE, immunofluorescence co-localization, heterodimer incorporation assay, mitochondrial stress induction\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — BN-PAGE plus KO cell lines plus functional assay, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"30084972\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"CHCHD10 serves as a scaffolding protein required for CHCHD2 (MNRR1) phosphorylation by ARG/Abl2 kinase; CHCHD10 co-purifies with COX and up-regulates COX activity. In the nucleus, CHCHD10 down-regulates ORE-containing gene expression by interacting with and augmenting transcriptional repressor CXXC5.\",\n      \"method\": \"Co-purification with COX, Co-IP (CHCHD10/CHCHD2/ARG), COX activity assay, nuclear CHCHD10 interaction with CXXC5, gene expression analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, functional enzymatic assay, single lab with multiple methods; finding involves CHCHD10 mechanism but directly informs CHCHD2 phosphorylation pathway\",\n      \"pmids\": [\"29540477\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"PD-associated CHCHD2 mutations R145Q and Q126X reduce interaction with CHCHD10 and disrupt the MICOS (mitochondrial contact site and cristae organizing system) complex, leading to hollow mitochondria with reduced cristae. Wild-type CHCHD2 physically colocalizes with MICOS components by super-resolution microscopy.\",\n      \"method\": \"CRISPR-Cas9 isogenic hESC lines, super-resolution microscopy (STED), co-immunoprecipitation (CHCHD2/CHCHD10), MICOS component quantification, electron microscopy of cristae\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — isogenic CRISPR lines, super-resolution microscopy, Co-IP, electron microscopy; single lab but multiple orthogonal methods\",\n      \"pmids\": [\"30496485\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Loss of CHCHD2 and CHCHD10 activates the mitochondrial stress-induced peptidase OMA1, which cleaves L-OPA1, thereby disrupting mitochondrial cristae. CHCHD2/CHCHD10 are partially functionally redundant; mutant CHCHD10 knock-in mice show the same OMA1 activation and L-OPA1 cleavage phenotype.\",\n      \"method\": \"CHCHD2/CHCHD10 double-knockout mice, OMA1 activity assay, OPA1 cleavage assay by immunoblot, mutant CHCHD10 knock-in mice, electron microscopy\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo DKO and KI mouse models, direct OMA1 activity assay, OPA1 cleavage validated across models\",\n      \"pmids\": [\"32338760\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Drosophila Chchd2 regulates mitochondrial morphology by stabilizing Opa1 protein levels. Chchd2 competes with the chaperone-like protein P32 for binding to YME1L protease; P32-YME1L interaction enhances Opa1 degradation, and Chchd2 stabilizes Opa1 by displacing P32 from YME1L. Co-immunoprecipitation confirmed Chchd2 interaction with P32 and YME1L.\",\n      \"method\": \"Drosophila Chchd2 knockout, co-immunoprecipitation (Chchd2/P32/YME1L), YME1L activity assay, OPA1 protein level quantification, epistasis with Marf overexpression and Opa1 RNAi\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, protease activity assay, in vivo genetic epistasis, multiple orthogonal methods in one study\",\n      \"pmids\": [\"31907391\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"The T61I CHCHD2 mutation causes its precipitation (insolubility) inside the mitochondrial IMS, and T61I CHCHD2 exerts a dominant-negative effect by impairing the solubility of wild-type CHCHD2. Mitochondrial targeting of CHCHD2 depends on the four cysteine residues in the C-terminal CHCH domain, not on the N-terminal predicted targeting sequence.\",\n      \"method\": \"Subcellular fractionation, solubility assay (detergent-based), cysteine mutagenesis of CHCH domain, live-cell fluorescence microscopy, ROS and apoptosis assays\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — mutagenesis of targeting cysteines, direct solubility/fractionation assay, dominant-negative co-expression experiment; single lab but multiple orthogonal methods\",\n      \"pmids\": [\"32068847\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"CHCHD2 (MNRR1) overexpression in MELAS cells induces the mitochondrial unfolded protein response (UPRmt), autophagy, and mitochondrial biogenesis, rescuing the mitochondrial phenotype. This rescue operates primarily through CHCHD2's nuclear transcription activator function. CHCHD2 acts upstream of the UPRmt mediator ATF5; CHCHD2 knockout cells display ~40% reduction in ATF5 protein.\",\n      \"method\": \"Overexpression in MELAS cybrid cells, UPRmt marker quantification, autophagy assay, ATF5 protein quantification in CHCHD2-KO cells, mitochondrial biogenesis assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — MELAS disease model, KO cells, multiple functional readouts (UPRmt, autophagy, biogenesis), ATF5 epistasis; single lab but orthogonal methods\",\n      \"pmids\": [\"33257573\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CHCHD2 primes neuroectodermal differentiation of pluripotent stem cells by binding and sequestering SMAD4 to the mitochondria, thereby suppressing TGFβ signaling pathway activity.\",\n      \"method\": \"Co-immunoprecipitation (CHCHD2/SMAD4), subcellular fractionation, SMAD4 localization by immunofluorescence, TGFβ reporter assay, CHCHD2 knockdown/overexpression with neuroectodermal differentiation readout\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, functional reporter assay, differentiation phenotype; single lab with multiple methods\",\n      \"pmids\": [\"27810911\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CHCHD2 and CHCHD10 interact with OMA1 in physiological conditions and suppress its enzymatic activity, restraining both the initiation of mitochondrial integrated stress response (mtISR) and OPA1 processing for mitochondrial fusion. During mitochondrial stress (CCCP), CHCHD2 and CHCHD10 translocate to the cytosol and interact with eIF2α, attenuating mtISR over-activation by suppressing eIF2α phosphorylation.\",\n      \"method\": \"Co-immunoprecipitation (CHCHD2/CHCHD10 with OMA1 and eIF2α), OMA1 activity assay, eIF2α phosphorylation assay, subcellular fractionation after CCCP treatment, CHCHD2/CHCHD10 knockdown\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with OMA1 and eIF2α, OMA1 activity assay, stress-induced translocation; single lab with multiple methods\",\n      \"pmids\": [\"35173147\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"CHCHD2 T61I mutant protein mislocalizes to the cytosol in Neuro2a cells and recruits casein kinase 1ε/δ (Csnk1e/d), which then phosphorylates neurofilament and α-synuclein, forming cytosolic aggresomes. A Csnk1e/d inhibitor suppresses this phosphorylation and improves neurodegeneration phenotypes in Chchd2 T61I mice.\",\n      \"method\": \"Fluorescence microscopy (T61I mislocalization), co-immunoprecipitation (CHCHD2/Csnk1e/d), phospho-α-synuclein assay, aggresome quantification, in vivo T61I knock-in and transgenic mice, pharmacologic Csnk1e/d inhibitor rescue in mice and iPSC-derived neurons\",\n      \"journal\": \"EMBO molecular medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP, in vivo genetic models (KI + transgenic), pharmacologic rescue, multiple orthogonal readouts; replicated in patient brain tissue\",\n      \"pmids\": [\"37578019\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"CHCHD2 deficiency reduces α-ketoglutarate dehydrogenase (KGDH) complex protein levels in mouse brain and human dopaminergic neurons, leading to elevated α-ketoglutarate and increased lipid peroxidation. Treatment with lipoic acid (a KGDH cofactor/antioxidant) reduces lipid peroxidation and phosphorylated α-synuclein in CHCHD2-deficient neurons. This KGDH pathway effect is specific to CHCHD2 and not CHCHD10.\",\n      \"method\": \"Unbiased metabolomics of purified mitochondria, KGDH protein quantification in KO mouse brain and iPSC-derived dopaminergic neurons, lipoic acid treatment with lipid peroxidation and p-α-synuclein assay, CHCHD10 KO comparison\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — unbiased metabolomics, multiple model systems (mouse brain + human neurons), orthogonal pharmacologic rescue, CHCHD10 specificity control\",\n      \"pmids\": [\"40011434\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"CHCHD2 binds near helix IX of COX (exposed in the IMS) and induces structural changes around the heme sites, particularly around helix X (located between both hemes), thereby accelerating proton uptake in the reduced state for proton pumping.\",\n      \"method\": \"Visible resonance Raman spectroscopy of purified COX in reduced and CO-bound states with and without CHCHD2 binding\",\n      \"journal\": \"Journal of inorganic biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — structural/spectroscopic method with purified proteins, but single lab and single method; no mutagenesis validation of the specific helix contacts\",\n      \"pmids\": [\"39094247\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"CHCHD2 interacts with F1F0-ATPase (confirmed by mass spectrometry and co-immunoprecipitation), and wild-type CHCHD2 overexpression promotes F1F0-ATPase assembly. The T61I mutant has lost the ability to regulate F1F0-ATPase assembly, contributing to mitochondrial dysfunction in a PD cell model.\",\n      \"method\": \"Mass spectrometry, co-immunoprecipitation (CHCHD2/F1F0-ATPase), BN-PAGE for ATPase assembly, overexpression of WT vs. T61I in MPP+-treated SH-SY5Y cells, in vivo MPTP mouse model with AAV-T61I\",\n      \"journal\": \"Neural regeneration research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — MS-confirmed interaction, Co-IP, BN-PAGE assembly assay; single lab with multiple methods\",\n      \"pmids\": [\"37488867\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CHCHD2 interacts with Mic10 (a MICOS component) as shown by co-immunoprecipitation; overexpression of CHCHD2 protects against MPP+-induced MICOS impairment, while CHCHD2 knockdown destabilizes MICOS. CHCHD2 overexpression protects against MPP+-induced mitochondrial dysfunction and inhibits dopaminergic neuron loss in an MPTP mouse model.\",\n      \"method\": \"Co-immunoprecipitation (CHCHD2/Mic10), BN-PAGE, 2D-SDS-PAGE for MICOS stability, AAV-mediated CHCHD2 overexpression in MPTP mice with dopaminergic neuron counting\",\n      \"journal\": \"Chinese medical journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, BN-PAGE, in vivo mouse rescue; single lab with multiple orthogonal methods\",\n      \"pmids\": [\"35830185\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"C1QBP (a mitochondrial protein) regulates the stability of CHCHD2 and CHCHD10 proteins and maintains the integrity of a C1QBP/CHCHD2/CHCHD10 ternary complex. CHCHD2 deficiency leads to decreased neural cell viability and mitochondrial structural and functional impairment with upregulated autophagy under cellular stress.\",\n      \"method\": \"Co-immunoprecipitation (C1QBP/CHCHD2/CHCHD10 complex), CHCHD2 deficiency models (siRNA and in vivo), mitochondrial function assays, autophagy/mitophagy quantification, cell viability assay\",\n      \"journal\": \"Molecular neurobiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP for ternary complex, multiple functional readouts; single lab\",\n      \"pmids\": [\"38453793\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"CHCHD2 acts as a repressive transcription factor at the RNase H1 promoter to inhibit RNase H1 expression and promote R-loop accumulation. Sirt1 deacetylates CHCHD2 and acts as a co-repressor, enhancing CHCHD2-mediated suppression of RNase H1 transcription. G9a methylase prevents CHCHD2/Sirt1 recruitment to the RNase H1 promoter.\",\n      \"method\": \"ChIP assay (CHCHD2/Sirt1 at RNase H1 promoter), co-immunoprecipitation (CHCHD2/Sirt1), gene expression assays after CHCHD2 knockdown/G9a knockdown, R-loop quantification\",\n      \"journal\": \"Cell insight\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP, Co-IP, functional gene expression assay; single lab with multiple methods\",\n      \"pmids\": [\"37388553\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"HIF2α binds the CHCHD2 (MNRR1) promoter and inhibits transcription by competing with the transcriptional activator RBPJκ. In MELAS cells a pseudohypoxic state stabilizes HIF2α (via reduced PHD3), thereby reducing CHCHD2 levels.\",\n      \"method\": \"ChIP assay (HIF2α at MNRR1 promoter), promoter competition assay (HIF2α vs. RBPJκ), PHD3 quantification in MELAS cybrids, HIF2α knockdown/stabilization experiments\",\n      \"journal\": \"Cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP, promoter competition assay, disease cell model; single lab\",\n      \"pmids\": [\"40710331\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"CHCHD2 transcriptional activation requires interaction with RBPJκ and recruitment of the co-activator p300 to the ORE promoter element. A minimal domain of CHCHD2 is sufficient for nuclear function, and peptides based on this domain can activate transcription by enhancing p300-RBPJκ interaction.\",\n      \"method\": \"Co-immunoprecipitation (CHCHD2/RBPJκ/p300), domain deletion analysis, peptide-based activation assay, downstream pathway (UPRmt, biogenesis) activation in MELAS model\",\n      \"journal\": \"Mitochondrion\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, minimal domain mapping, functional assay with downstream readouts; single lab\",\n      \"pmids\": [\"41592630\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"CHCHD2 and CHCHD10 form a complex with C1QBP/p32 and ATG8-family proteins (preferentially GABARAPs). Through GABARAP binding, CHCHD2/CHCHD10 undergo autophagic degradation and recruit the ULK1 complex to activate autophagy initiation. CHCHD2 promotes clearance of toxic α-synuclein species and reduces protein aggregates.\",\n      \"method\": \"Co-immunoprecipitation of CHCHD2-CHCHD10-C1QBP-ATG8 complex, ATG8 binding specificity assay (GABARAPs vs. LC3s), ULK1 complex recruitment assay, autophagy initiation assay in CHCHD2 KO iPSC-derived neurons, α-synuclein aggregate quantification in mouse striatum\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP for complex, iPSC-derived KO neurons, in vivo α-synuclein assay; single lab but multiple orthogonal methods\",\n      \"pmids\": [\"42183628\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Loss of CHCHD2 epigenetically (by promoter methylation) attenuates Rho-associated protein kinase (ROCK) activity in human pluripotent stem cells, conferring resistance to single-cell dissociation-induced death during in vitro culture.\",\n      \"method\": \"Transcriptome and methylome analysis, CHCHD2 knockdown and reconstitution in hESCs, ROCK activity assay, cell survival assay under enzymatic dissociation\",\n      \"journal\": \"Cellular and molecular life sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic perturbation and reconstitution, functional ROCK activity assay; single lab with multiple methods\",\n      \"pmids\": [\"38214772\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"CHCHD2 T61I knock-in mice show pronounced mitochondrial disruption (distorted ultrastructure and CHCHD2 aggregation) in substantia nigra dopaminergic neurons, disrupted mitochondrial protein-protein interactions, a whole-body metabolic shift toward glycolysis, elevated mitochondrial ROS, and progressive α-synuclein aggregation. In idiopathic PD, CHCHD2 protein accumulates in early Lewy aggregates, linking CHCHD2 accumulation to α-synuclein pathology.\",\n      \"method\": \"CRISPR knock-in T61I mice, immune-electron microscopy, spatial genomics, proteomics (mitochondrial PPI), metabolic phenotyping (RER), α-synuclein aggregation assay, human PD brain immunofluorescence\",\n      \"journal\": \"Science advances\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo genetic knock-in model with multiple orthogonal methods (EM, proteomics, metabolomics, human tissue validation)\",\n      \"pmids\": [\"41237231\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Loss of CHCHD2 in zebrafish impairs Complex I assembly and causes motor impairment, reduced survival, and compromised neuromuscular junction integrity. However, in chchd2/chchd10 double KO zebrafish, Complex I is paradoxically restored and the mt-ISR is activated, suggesting that mt-ISR activation can compensate for the Complex I defect seen in single KOs.\",\n      \"method\": \"Zebrafish CRISPR knockout (chchd2-/-, chchd10-/-, double KO), Complex I assembly assay (BN-PAGE), behavioral motor assay, neuromuscular junction staining, mt-ISR transcriptional marker assay\",\n      \"journal\": \"Developmental neurobiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo KO model, BN-PAGE complex assembly assay, genetic epistasis with double KO; single lab\",\n      \"pmids\": [\"36799027\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CHCHD2 and CHCHD10 exist exclusively as a high-molecular-weight complex in mouse tissues in vivo; this complex increases in abundance and size in response to mitochondrial dysfunction across different tissues. Loss of CHCHD2 does not abolish CHCHD10 oligomerization but enhances cell vulnerability to mitochondrial stress. CHCHD2 KO mice display impaired motor capacity, reduced striatal dopamine levels, and lipid homeostasis disruption in the brain.\",\n      \"method\": \"Whole-body Chchd2 KO mice, BN-PAGE, mitochondrial stress induction, motor behavior assay, dopamine quantification, lipidomics\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo KO mouse, BN-PAGE, lipidomics, multiple tissue analyses; single lab\",\n      \"pmids\": [\"41053020\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"CHCHD2 knockdown markedly reduces expression of mtUPR-related proteins (HSPA9, HSPD1, YME1L1, CLPP) in an MPP+-induced PD cell model, and the mtUPR activation by CHCHD2 involves the JNK/c-Jun and AKT/ERα pathways.\",\n      \"method\": \"shRNA knockdown of CHCHD2 in MPP+-treated SH-SY5Y cells, Western blot for mtUPR proteins, JNK and AKT agonist treatment, electron microscopy of mitochondrial morphology\",\n      \"journal\": \"ACS chemical neuroscience\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, shRNA knockdown with protein quantification, pharmacological agonists without genetic epistasis confirmation\",\n      \"pmids\": [\"41640382\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"CHCHD2 promotes cell migration and regulates mitochondrial respiration in NSCLC cells. Protein-protein interaction mapping identified C1QBP (mitochondrial hub) and YBX1 (oncogenic transcription factor) as CHCHD2 interactors by affinity purification mass spectrometry and proximity ligation.\",\n      \"method\": \"CHCHD2 knockdown in NSCLC cells (migration assay, proliferation assay, oxygen consumption), affinity purification mass spectrometry, proximity ligation assay\",\n      \"journal\": \"Molecular cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — AP-MS for interactome, functional knockdown assay; single lab with two orthogonal interaction methods\",\n      \"pmids\": [\"25784717\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CHCHD2 acts as a nuclear transcription factor in NASH liver; ChIP-seq identified CHCHD2 target genes enriched in NAFLD pathways. CHCHD2 promotes liver fibrosis via Notch signaling by up-regulating osteopontin in hepatocytes, which activates hepatic stellate cells. LPS-induced CHCHD2 expression in hepatocytes is dependent on YAP/TAZ-TEAD.\",\n      \"method\": \"ChIP sequencing (CHCHD2 target genes), hepatocyte-specific CHCHD2 overexpression/knockout mice, Notch inhibition rescue, osteopontin quantification, YAP/TAZ inhibitor (verteporfin) treatment\",\n      \"journal\": \"JCI insight\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP-seq, in vivo conditional OE/KO models, pathway rescue; single lab with multiple methods\",\n      \"pmids\": [\"36477358\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"In MASH liver, CHCHD2 protein degradation is primarily mediated by the mitochondrial protease ClpXP, which is repressed in MASH. Elevated CHCHD2 promotes VEGFA transcription (identified by ChIP-seq) in hepatocytes, leading to increased angiogenic activity and supporting HCC growth.\",\n      \"method\": \"CHCHD2 ChIP-seq, Chchd2 KO mice, AAV-mediated hepatocyte-specific CHCHD2 OE, ClpXP protease assay, VEGFA expression and angiogenesis assay, orthotopic HCC mouse model\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP-seq, in vivo KO and OE models, protease identification; single lab with multiple methods\",\n      \"pmids\": [\"40025232\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CHCHD2 (MNRR1) is a bi-organellar mitochondrial IMS protein that, in mitochondria, directly binds and activates cytochrome c oxidase (Complex IV) via Abl2-mediated phosphorylation at Tyr-99, stabilizes OPA1 by competing with P32 for YME1L binding, maintains MICOS cristae integrity through interaction with Mic10, forms a partially redundant high-molecular-weight heterodimeric complex with CHCHD10 required for efficient respiration, interacts with Bcl-xL to suppress Bax-driven apoptosis, and binds cytochrome c with MICS1 to modulate cell death signaling; in the nucleus it functions as a transcription factor at an 8-bp oxygen-responsive element (ORE) in complex with RBPJκ and p300, activating hypoxia-responsive genes (including COX4I2) and regulating UPRmt via ATF5; the PD-linked T61I mutation causes IMS protein precipitation with dominant-negative effects on wild-type CHCHD2, cytosolic mislocalization, recruitment of Csnk1e/d kinase to phosphorylate α-synuclein, impaired F1F0-ATPase assembly, and reduced KGDH activity leading to lipid peroxidation and α-synuclein aggregation.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CHCHD2 (MNRR1) is a bi-organellar regulator of mitochondrial bioenergetics and stress signaling that functions both as an intermembrane-space respiratory effector and as a nuclear transcription factor [#0, #1]. Imported into the IMS via the Mia40 pathway through cysteines of its C-terminal CHCH domain, it binds directly to cytochrome c oxidase (Complex IV) and is required for full COX activity, membrane potential, and respiration [#0, #11]; binding near helix IX of COX induces structural changes around the heme sites that accelerate proton uptake [#17], and Abl2/ARG-mediated phosphorylation at Tyr-99 promotes its COX association and stimulates respiration [#3]. CHCHD2 partners with CHCHD10 in a high-molecular-weight heterodimeric complex required for efficient respiration and Complex I assembly, the two proteins being partially redundant in vivo [#5, #6, #28]. CHCHD2 maintains cristae architecture through interaction with the MICOS component Mic10 and, together with CHCHD10, restrains the stress peptidase OMA1 to prevent L-OPA1 cleavage and aberrant cristae remodeling [#9, #14, #19]; in Drosophila it stabilizes Opa1 by displacing P32 from the YME1L protease [#10]. It suppresses apoptosis by binding Bcl-xL to block Bax oligomerization and MOMP, and modulates cell death together with cytochrome c and MICS1 [#2, #4]. In the nucleus, CHCHD2 binds an oxygen-responsive element (ORE) with RBPJκ and the co-activator p300 to activate hypoxia-responsive and mitochondrial-recovery genes including COX4I2, and drives the mitochondrial unfolded protein response upstream of ATF5 [#1, #12, #23]. The Parkinson's-disease-linked T61I mutation precipitates within the IMS with dominant-negative effects on wild-type CHCHD2, mislocalizes to the cytosol where it recruits casein kinase 1ε/δ to phosphorylate α-synuclein, and impairs F1F0-ATPase assembly [#11, #15, #18]; CHCHD2 deficiency lowers α-ketoglutarate dehydrogenase, driving lipid peroxidation and α-synuclein aggregation, establishing a direct mechanistic link to neurodegeneration [#16, #26].\",\n  \"teleology\": [\n    {\n      \"year\": 2014,\n      \"claim\": \"Established CHCHD2 as a dual-function protein: an IMS effector required for Complex IV activity and a hypoxia-responsive nuclear transcription factor, defining its bi-organellar nature.\",\n      \"evidence\": \"Subcellular fractionation, Co-IP with COX, respiration assays, promoter-reporter and ChIP under normoxia vs. hypoxia\",\n      \"pmids\": [\"25315652\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular signal switching import vs. nuclear retention not fully resolved\", \"Direct DNA-binding mode at the ORE not structurally defined\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Showed CHCHD2 acts as an anti-apoptotic guardian at mitochondria, answering how it couples bioenergetics to cell-death control.\",\n      \"evidence\": \"Reciprocal Co-IP with Bcl-xL, Bax oligomerization, cytochrome c release and MOMP assays\",\n      \"pmids\": [\"25476776\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether Bcl-xL binding is direct or bridged not resolved\", \"Quantitative contribution to apoptosis in vivo unclear\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Linked CHCHD2 to a broader interactome (C1QBP, YBX1) and a pro-migratory role in cancer cells, extending function beyond classical mitochondrial biology.\",\n      \"evidence\": \"AP-MS and proximity ligation interactome mapping with knockdown migration/respiration assays in NSCLC\",\n      \"pmids\": [\"25784717\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct vs. indirect nature of YBX1 interaction unproven\", \"Mechanism connecting respiration to migration not defined\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Identified the post-translational control of COX binding through Abl2/ARG phosphorylation at Tyr-99, mechanizing how respiration is tuned and how a disease mutation impairs it.\",\n      \"evidence\": \"Site-directed mutagenesis, in vitro kinase assay, Co-IP with Abl2 and COX, oxygen consumption\",\n      \"pmids\": [\"27913209\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Phosphatase that reverses Y99 not identified\", \"Stoichiometry of phospho-CHCHD2 in vivo unknown\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Revealed a non-respiratory developmental role: CHCHD2 sequesters SMAD4 at mitochondria to suppress TGFβ signaling and prime neuroectodermal differentiation.\",\n      \"evidence\": \"Co-IP, fractionation, TGFβ reporter assay, differentiation readout in pluripotent stem cells\",\n      \"pmids\": [\"27810911\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab without reciprocal in vivo validation\", \"How mitochondrial sequestration is regulated unclear\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Confirmed cytochrome c/MICS1 partnership and demonstrated, in an in vivo dopaminergic model, that PD mutants fail to rescue CHCHD2 loss, tying the gene to neurodegeneration.\",\n      \"evidence\": \"Co-IP, Drosophila KO/rescue with WT vs. mutant human CHCHD2, EM, neuron counting\",\n      \"pmids\": [\"28589937\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mammalian relevance of MICS1 interaction not directly shown\", \"Mechanism of mutant loss-of-function not dissected here\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Defined the CHCHD2–CHCHD10 heterodimeric complex as the functional respiratory unit and showed ALS-linked CHCHD10 variants destabilize it, unifying two disease genes mechanistically.\",\n      \"evidence\": \"Reciprocal Co-IP, BN-PAGE, respiration assays in patient fibroblasts, KO cell lines, IF co-localization\",\n      \"pmids\": [\"29121267\", \"30084972\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry and structure of the ~220 kDa complex undefined\", \"How the complex is distributed across cristae not mechanized\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Showed CHCHD10 scaffolds CHCHD2 phosphorylation by ARG and that nuclear CHCHD10 opposes CHCHD2 at ORE genes via CXXC5, revealing reciprocal regulation.\",\n      \"evidence\": \"Co-purification with COX, Co-IP of CHCHD10/CHCHD2/ARG, COX activity and gene expression assays\",\n      \"pmids\": [\"29540477\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct vs. indirect scaffolding of the kinase unresolved\", \"Generality of CXXC5 repression across ORE genes unknown\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Connected PD-associated CHCHD2 mutations to MICOS disruption and cristae collapse, mechanizing the structural consequence of disease alleles.\",\n      \"evidence\": \"Isogenic CRISPR hESC lines, STED super-resolution, Co-IP, EM of cristae\",\n      \"pmids\": [\"30496485\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct MICOS subunit contacts not mapped\", \"Whether cristae loss is cause or consequence of respiratory defect unclear\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Established that CHCHD2/CHCHD10 loss activates OMA1 to cleave L-OPA1, identifying the protease axis that links the complex to cristae and fusion control.\",\n      \"evidence\": \"DKO and mutant CHCHD10 knock-in mice, OMA1 activity and OPA1 cleavage immunoblots, EM\",\n      \"pmids\": [\"32338760\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct OMA1 binding shown later; activation mechanism not fully defined here\", \"Tissue specificity of redundancy not characterized\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Identified the YME1L/P32 competition mechanism by which CHCHD2 stabilizes OPA1 and controls mitochondrial morphology.\",\n      \"evidence\": \"Drosophila KO, Co-IP with P32 and YME1L, protease activity assay, genetic epistasis\",\n      \"pmids\": [\"31907391\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Conservation of the P32/YME1L mechanism in mammals not confirmed here\", \"Quantitative balance between YME1L and OMA1 axes unclear\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Defined the molecular pathology of the T61I mutation: IMS precipitation with dominant-negative aggregation of wild-type protein, and mapped CHCH-domain cysteines as the true mitochondrial targeting determinant.\",\n      \"evidence\": \"Fractionation, detergent solubility assays, cysteine mutagenesis, live-cell imaging, ROS/apoptosis assays\",\n      \"pmids\": [\"32068847\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of aggregation not determined\", \"Why T61I specifically destabilizes the fold not resolved\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Showed CHCHD2's nuclear transcription function drives UPRmt, autophagy, and biogenesis to rescue mitochondrial disease, placing it upstream of ATF5.\",\n      \"evidence\": \"Overexpression in MELAS cybrids, UPRmt/autophagy/biogenesis markers, ATF5 quantification in KO cells\",\n      \"pmids\": [\"33257573\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether CHCHD2 directly transactivates ATF5 not shown\", \"Relative contribution of nuclear vs. mitochondrial pools to rescue unclear\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Demonstrated direct OMA1 binding and stress-induced cytosolic translocation where CHCHD2/CHCHD10 engage eIF2α to restrain mtISR over-activation.\",\n      \"evidence\": \"Co-IP with OMA1 and eIF2α, OMA1 activity assay, eIF2α phosphorylation, fractionation after CCCP\",\n      \"pmids\": [\"35173147\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct vs. indirect eIF2α interaction not fully established\", \"Single lab without reciprocal validation\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Identified Mic10 as a CHCHD2 MICOS partner and showed CHCHD2 overexpression protects against toxin-induced MICOS impairment and neuron loss.\",\n      \"evidence\": \"Co-IP with Mic10, BN-PAGE/2D-SDS-PAGE for MICOS stability, AAV overexpression in MPTP mice\",\n      \"pmids\": [\"35830185\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct binding interface with Mic10 not mapped\", \"Single lab\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Showed in zebrafish that single CHCHD2 loss impairs Complex I and neuromuscular function but double KO restores Complex I via mt-ISR, revealing a compensatory stress response.\",\n      \"evidence\": \"CRISPR single and double KO zebrafish, BN-PAGE Complex I assembly, motor and NMJ assays\",\n      \"pmids\": [\"36799027\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of mt-ISR-mediated Complex I restoration not defined\", \"Single model organism\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Extended CHCHD2's nuclear role to liver disease, showing it drives fibrosis via Notch/osteopontin and is induced through YAP/TAZ-TEAD.\",\n      \"evidence\": \"ChIP-seq, hepatocyte-specific OE/KO mice, Notch inhibition rescue, verteporfin treatment\",\n      \"pmids\": [\"36477358\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct target genes vs. indirect effects not fully separated\", \"Connection to mitochondrial function in liver unclear\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Mechanized the T61I gain-of-function in neurodegeneration: cytosolic mislocalization recruits CK1ε/δ to phosphorylate α-synuclein, and kinase inhibition rescues phenotypes.\",\n      \"evidence\": \"Co-IP with Csnk1e/d, phospho-α-synuclein and aggresome assays, T61I KI/transgenic mice, inhibitor rescue in mice and iPSC neurons\",\n      \"pmids\": [\"37578019\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How mislocalized CHCHD2 recruits the kinase mechanistically unclear\", \"Generality across other CHCHD2 mutants not tested\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Revealed a genome-stability role: CHCHD2 represses RNase H1 transcription with Sirt1 as co-repressor, promoting R-loop accumulation.\",\n      \"evidence\": \"ChIP and Co-IP with Sirt1, gene expression after CHCHD2/G9a knockdown, R-loop quantification\",\n      \"pmids\": [\"37388553\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Physiological context of R-loop regulation unclear\", \"Single lab without orthogonal validation\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Provided spectroscopic evidence for how CHCHD2 binding remodels COX heme architecture to accelerate proton uptake, mechanizing its respiratory activation.\",\n      \"evidence\": \"Visible resonance Raman spectroscopy of purified COX with and without CHCHD2\",\n      \"pmids\": [\"39094247\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No mutagenesis validation of the proposed helix contacts\", \"Single method, single lab\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Defined a CHCHD2-specific metabolic axis: deficiency lowers KGDH, raising α-ketoglutarate and lipid peroxidation, with lipoic acid rescuing p-α-synuclein.\",\n      \"evidence\": \"Unbiased mitochondrial metabolomics, KGDH quantification in KO mouse brain and iPSC neurons, lipoic acid rescue, CHCHD10 KO control\",\n      \"pmids\": [\"40011434\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How CHCHD2 loss lowers KGDH protein not mechanized\", \"Link between α-KG elevation and lipid peroxidation not fully traced\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Identified CHCHD2 regulation of F1F0-ATPase assembly and the T61I loss of this function in PD cell and mouse models.\",\n      \"evidence\": \"MS and Co-IP with F1F0-ATPase, BN-PAGE assembly, WT vs. T61I in MPP+ cells, MPTP/AAV mouse model\",\n      \"pmids\": [\"37488867\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct binding interface with ATPase subunits unmapped\", \"Single lab\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Placed CHCHD2 in a C1QBP/CHCHD2/CHCHD10 ternary complex regulating protein stability and neural cell viability under stress.\",\n      \"evidence\": \"Co-IP of ternary complex, CHCHD2 deficiency models, mitochondrial function and autophagy assays\",\n      \"pmids\": [\"38453793\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Architecture and stoichiometry of ternary complex unknown\", \"Single lab\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Showed CHCHD2 loss in pluripotent stem cells epigenetically attenuates ROCK activity, conferring dissociation resistance, broadening its regulatory reach.\",\n      \"evidence\": \"Transcriptome/methylome analysis, knockdown/reconstitution, ROCK activity and survival assays in hESCs\",\n      \"pmids\": [\"38214772\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanistic link between CHCHD2 and ROCK indirect\", \"Single lab\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Identified HIF2α as a repressor of the CHCHD2 promoter via RBPJκ competition, mechanizing pseudohypoxic CHCHD2 loss in MELAS.\",\n      \"evidence\": \"ChIP, HIF2α vs. RBPJκ promoter competition assay, PHD3 quantification in MELAS cybrids\",\n      \"pmids\": [\"40710331\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Generality across cell types not established\", \"Single lab\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Demonstrated in MASH liver that ClpXP-mediated degradation controls CHCHD2 levels and that elevated CHCHD2 drives VEGFA-dependent angiogenesis supporting HCC.\",\n      \"evidence\": \"ChIP-seq, KO and hepatocyte-specific OE mice, ClpXP protease assay, orthotopic HCC model\",\n      \"pmids\": [\"40025232\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct ClpXP recognition motif on CHCHD2 not defined\", \"Mitochondrial vs. nuclear pool driving VEGFA unclear\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Comprehensively characterized the T61I knock-in mouse, linking IMS aggregation, glycolytic metabolic shift, and α-synuclein pathology to human Lewy aggregate accumulation.\",\n      \"evidence\": \"CRISPR T61I KI mice, immuno-EM, spatial genomics, mitochondrial proteomics, metabolic phenotyping, human PD brain IF\",\n      \"pmids\": [\"41237231\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Temporal sequence of metabolic shift vs. aggregation not resolved\", \"Whether CHCHD2 accumulation initiates or follows Lewy pathology unclear\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Mapped the nuclear transactivation mechanism to RBPJκ binding and p300 recruitment at the ORE, with a minimal peptide sufficient to activate transcription.\",\n      \"evidence\": \"Co-IP of CHCHD2/RBPJκ/p300, domain deletion, peptide activation assay, downstream UPRmt/biogenesis readouts in MELAS\",\n      \"pmids\": [\"41592630\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Structural basis of CHCHD2-RBPJκ-p300 assembly undefined\", \"Single lab\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Revealed an autophagy-regulatory function: CHCHD2/CHCHD10 with C1QBP bind GABARAPs to recruit ULK1 and initiate autophagy, promoting α-synuclein clearance.\",\n      \"evidence\": \"Co-IP of CHCHD2-CHCHD10-C1QBP-ATG8 complex, ATG8 specificity, ULK1 recruitment, autophagy in KO iPSC neurons, α-synuclein assay\",\n      \"pmids\": [\"42183628\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether autophagy role is mitochondria-localized or cytosolic unclear\", \"Single lab\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Reported that CHCHD2 knockdown reduces mtUPR proteins via JNK/c-Jun and AKT/ERα pathways in a PD cell model.\",\n      \"evidence\": \"shRNA knockdown in MPP+-treated SH-SY5Y, Western blot, JNK/AKT agonist treatment, EM\",\n      \"pmids\": [\"41640382\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Pharmacological agonists used without genetic epistasis confirmation\", \"Single lab, single cell model\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the bi-organellar partition of CHCHD2 is dynamically controlled and how its mitochondrial structural/respiratory roles mechanistically converge with its nuclear transcriptional program to determine neuronal vulnerability remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model linking respiratory, cristae, and transcriptional functions\", \"Structure of the CHCHD2/CHCHD10 complex undefined\", \"Causal hierarchy among bioenergetic, metabolic, and aggregation defects in disease unclear\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [1, 12, 21, 23, 31, 32]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [1, 21, 23]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 2, 14, 17, 19]},\n      {\"term_id\": \"GO:0140313\", \"supporting_discovery_ids\": [13]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005758\", \"supporting_discovery_ids\": [0, 11]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [0, 8, 9, 19]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [1, 12, 21, 23]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [11, 14, 15]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1428517\", \"supporting_discovery_ids\": [0, 3, 5]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": []},\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [9, 12, 14]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [2, 4]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [1, 23, 31]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [24]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [11, 15, 16, 26]}\n    ],\n    \"complexes\": [\n      \"CHCHD2-CHCHD10 heterodimeric complex\",\n      \"MICOS\",\n      \"C1QBP/CHCHD2/CHCHD10 ternary complex\",\n      \"Cytochrome c oxidase (Complex IV) association\"\n    ],\n    \"partners\": [\n      \"CHCHD10\",\n      \"COX (cytochrome c oxidase)\",\n      \"OMA1\",\n      \"YME1L\",\n      \"C1QBP\",\n      \"Mic10\",\n      \"RBPJ\",\n      \"Bcl-xL\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}