{"gene":"APOOL","run_date":"2026-06-09T22:02:44","timeline":{"discoveries":[{"year":2013,"finding":"APOOL (MIC27) is a mitochondrial inner membrane protein facing the intermembrane space that specifically binds cardiolipin in vitro but not its precursor phosphatidylglycerol, and physically interacts with MINOS complex subunits Mitofilin, MINOS1, and SAMM50.","method":"Complexome profiling, lipid-binding in vitro assay, co-immunoprecipitation, overexpression/knockdown with mitochondrial morphology and oxygen consumption readouts","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (complexome profiling, lipid-binding assay, Co-IP, functional KD/OE) in a single focused study establishing direct physical and functional interactions","pmids":["23704930"],"is_preprint":false},{"year":2013,"finding":"Overexpression of APOOL causes mitochondrial fragmentation and reduced basal oxygen consumption rate with altered cristae morphology; downregulation impairs mitochondrial respiration and causes major cristae morphology alterations.","method":"Overexpression and miRNA-mediated knockdown with electron microscopy (cristae morphology), oxygen consumption rate measurement","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 / Strong — loss-of-function and gain-of-function with defined morphological and functional phenotypic readouts in the same study","pmids":["23704930"],"is_preprint":false},{"year":2015,"finding":"APOOL (MIC27) is a component of the Mic27/Mic10/Mic12 MICOS subcomplex, whose assembly is dependent on respiratory complexes and the mitochondrial lipid cardiolipin, forming a subcomplex independent of the Mic60/Mic19 subcomplex.","method":"Genetic deletion of MICOS subunits in yeast, complexome profiling, respiratory growth assays","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Strong — epistatic genetic analysis with multiple single and double deletions plus complexome profiling; replicated independently from the Weber 2013 study","pmids":["25918844"],"is_preprint":false},{"year":2015,"finding":"Loss of QIL1 (MIC13) results in degradation of MIC27 (APOOL) along with MIC10 and MIC26, while the MIC60-MIC19-MIC25 subcomplex accumulates, placing MIC27 in a QIL1-dependent MICOS subcomplex.","method":"Quantitative proteomics after QIL1 depletion, co-immunoprecipitation, functional respiration assays","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Strong — quantitative proteomics combined with Co-IP and functional assays, establishing pathway position of MIC27 within MICOS architecture","pmids":["25997101"],"is_preprint":false},{"year":2015,"finding":"MIC27 (APOOL) is a periphery subunit of the human MICOS/MIB complex whose depletion does not affect cristae morphology or stability of other MICOS components, unlike the core subunits MIC60, MIC19, and SAM50.","method":"Knockdown cell lines for most MICOS/MIB components, electron microscopy, western blot for complex stability","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — systematic knockdown across subunits with defined phenotypic readout, single lab, partially contradicts other reports on MIC27 importance","pmids":["25781180"],"is_preprint":false},{"year":2015,"finding":"MIC26 and MIC27 regulate each other's protein levels in an antagonistic manner; MIC26 physically interacts with MIC27 and other MICOS subunits (MIC60, MIC10), and both are positively correlated with MIC10 levels and tafazzin (a cardiolipin remodeling enzyme).","method":"miRNA-mediated knockdown, overexpression, co-immunoprecipitation, western blot for protein level changes","journal":"Biochimica et biophysica acta","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal regulation shown by bidirectional KD experiments with multiple orthogonal readouts; replicated in subsequent studies","pmids":["25764979"],"is_preprint":false},{"year":2016,"finding":"MIC13 (QIL1) is required for the assembly of MIC27 (APOOL) into the MICOS complex; MIC13 knockout cells show complete loss of crista junctions and loss of MIC27 from the complex, while the MIC60/MIC19/MIC25 subcomplex remains intact.","method":"CRISPR/Cas9 knockout, complexome profiling, electron microscopy","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 / Strong — first complete KO cell line for MIC13 with complexome profiling and EM; defines assembly hierarchy placing MIC27 downstream of MIC13","pmids":["27479602"],"is_preprint":false},{"year":2016,"finding":"MIC27 (APOOL) promotes stability of MIC10 oligomers within the membrane-sculpting MICOS subcomplex, while MIC12 is required for coupling the two MICOS subcomplexes; loss of MIC27 destabilizes the Mic10-containing subcomplex.","method":"Yeast genetic deletion, complexome profiling, blue-native PAGE","journal":"Journal of molecular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic deletion with complexome profiling defining specific molecular role of MIC27 in MIC10 oligomer stabilization","pmids":["26968360"],"is_preprint":false},{"year":2017,"finding":"MIC27 (APOOL) promotes oligomerization of the F1FO-ATP synthase and partially restores crista junction formation in cells lacking MIC60; MIC27 deletion impairs crista junction formation and alters cristae membrane curvature; a chemical crosslink of MIC10 to MIC27 was detected, supporting physical interaction within the MICOS-F1FO-ATP synthase interface.","method":"Yeast genetic deletion, complexome profiling, chemical crosslinking, electron microscopy, blue-native PAGE","journal":"Microbial cell (Graz, Austria)","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — genetic epistasis, chemical crosslinking, complexome profiling, and EM providing multiple orthogonal lines of evidence for MIC27 role in ATP synthase oligomerization","pmids":["28845423"],"is_preprint":false},{"year":2018,"finding":"MIC27 (APOOL) stabilizes MIC10 oligomers in an antagonistic relationship with MIC26 (which destabilizes MIC10 oligomers); cardiolipin also shows a stabilizing function on MIC10 oligomers, mechanistically linking MIC27's cardiolipin-binding activity to MICOS core scaffold regulation.","method":"Yeast genetic deletion of MIC26 and MIC27 (single and combined), blue-native PAGE for MIC10 oligomerization, cardiolipin manipulation","journal":"Journal of molecular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis with combined deletions across multiple groups, directly demonstrating antagonistic roles and cardiolipin dependence","pmids":["29733859"],"is_preprint":false},{"year":2018,"finding":"In a patient with loss-of-function mutation in QIL1/MIC13, the MIC10-MIC26-MIC27-QIL1 subcomplex is absent, resulting in aberrant cristae structure, loss of cristae junctions, and severely impaired respiratory chain complex activity in liver and muscle.","method":"Patient genetic analysis, western blot for MICOS subunit levels, electron microscopy of tissue, OXPHOS enzyme activity assays","journal":"Journal of human genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — human disease validation of MIC27 subcomplex membership, single case with multiple biochemical readouts but no in vitro reconstitution","pmids":["29618761"],"is_preprint":false},{"year":2019,"finding":"Yeast MIC27 uses the presequence pathway to reach the intermembrane space, establishing its mitochondrial import mechanism as distinct from the TIM40/MIA pathway used by Mic19.","method":"In vitro mitochondrial import assays with radiolabeled precursors, import inhibitors, yeast genetics","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro import assay with inhibitors, single lab study establishing import pathway","pmids":["30718713"],"is_preprint":false},{"year":2020,"finding":"MIC26 and MIC27 (APOOL) double knockout (DKO) human cells show more severe concentric onion-like cristae with loss of crista junctions than either single KO, indicating overlapping roles; both proteins are dispensable for stability and integration of remaining MICOS subunits, suggesting late assembly into the complex. DKO cells show reduced cardiolipin levels and impaired integrity of respiratory chain supercomplexes and F1Fo-ATP synthase; overexpression of cardiolipin synthase in DKO restores respiratory complex stability.","method":"CRISPR/Cas9 single and double KO in human cells, complexome profiling, STED nanoscopy, blue-native PAGE, cardiolipin measurement, cardiolipin synthase overexpression rescue","journal":"Life science alliance","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple KO combinations with rescue experiment, multiple orthogonal methods (complexome profiling, STED, BN-PAGE, lipidomics), establishing cooperative cardiolipin-dependent mechanism","pmids":["32788226"],"is_preprint":false},{"year":2020,"finding":"In Drosophila, the CG5903 gene encoding a MIC26-MIC27 ortholog colocalizes and functions with Mitofilin/MIC60 and QIL1/MIC13 as a MICOS component; knockdown causes loss of crista junctions, reduced mitochondrial membrane potential, fusion/fission imbalances, increased mitophagy, reduced mtDNA content, and muscle dysfunction.","method":"Drosophila in vivo knockdown, electron microscopy, live imaging, JC-1 membrane potential assay, mitophagy assays, climbing behavior test","journal":"Biology open","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo Drosophila model with multiple functional readouts, single lab, confirms MIC27 ortholog role in tissue homeostasis","pmids":["33268479"],"is_preprint":false},{"year":2023,"finding":"MIC27 (APOOL) is exclusively localized in mitochondria as a 30 kDa non-glycosylated protein; predicted glycosylation site mutagenesis and mass spectrometry of candidate bands confirmed no high-molecular-weight glycosylated isoform exists, establishing MIC27 as purely a mitochondrial MICOS subunit.","method":"CRISPR/Cas9 KO in four human cell lines, four anti-MIC26 antibodies, tagged MIC26/MIC27 variants, glycosylation site mutagenesis, mass spectrometry of excised gel bands","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — mutagenesis, mass spectrometry, and multiple antibody validation across four cell lines definitively ruling out glycosylated isoform","pmids":["37279200"],"is_preprint":false},{"year":2025,"finding":"Proximity biotinylation (APEX2) fused to MIC27 in MIC27 knockout cells identified 119 common and 50 unique proximal proteins (MINDNet), including OXPHOS subunits, protein translocases, mitochondrial ribosomal proteins, and solute carrier transporters, defining the molecular neighbourhood of MIC27 within the MICOS complex.","method":"APEX2 proximity biotinylation in MIC27 knockout human cells validated by electron microscopy (DAB staining) and STED super-resolution nanoscopy","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — proximity proteomics with structural validation, preprint, single lab, no functional follow-up for most interactions","pmids":["bio_10.1101_2025.05.20.655052"],"is_preprint":true}],"current_model":"APOOL (MIC27) is a non-glycosylated, cardiolipin-binding inner mitochondrial membrane protein facing the intermembrane space that assembles late into the MICOS complex as a core component of the MIC10/MIC12/MIC27 membrane-sculpting subcomplex, where it stabilizes MIC10 oligomers and promotes F1FO-ATP synthase oligomerization, acting antagonistically to MIC26 to regulate cardiolipin levels and thereby maintain crista junction formation, cristae morphology, and respiratory chain supercomplex integrity; its assembly into MICOS requires MIC13/QIL1, and loss of both MIC26 and MIC27 cooperatively depletes cardiolipin and disrupts OXPHOS complex stability."},"narrative":{"mechanistic_narrative":"APOOL (MIC27) is a non-glycosylated inner mitochondrial membrane protein of the MICOS complex that shapes cristae architecture by coupling cardiolipin binding to assembly of the membrane-sculpting MICOS scaffold [PMID:23704930, PMID:25918844, PMID:37279200]. It faces the intermembrane space, specifically binds cardiolipin but not its precursor phosphatidylglycerol, and physically associates with MICOS/MIB subunits including Mitofilin/MIC60, MINOS1/MIC10, and SAMM50 [PMID:23704930]. Within MICOS it belongs to the MIC10/MIC12/MIC27 subcomplex that assembles independently of the MIC60/MIC19 subcomplex and whose formation depends on cardiolipin and respiratory complexes [PMID:25918844]; its integration requires MIC13/QIL1, whose loss triggers degradation of MIC27 together with MIC10 and MIC26 [PMID:25997101, PMID:27479602]. Mechanistically, MIC27 stabilizes MIC10 oligomers and promotes oligomerization of the F1FO-ATP synthase, thereby supporting crista junction formation and cristae membrane curvature [PMID:26968360, PMID:28845423]. MIC27 and MIC26 reciprocally regulate each other's levels and act antagonistically on MIC10 oligomer stability, and their combined loss cooperatively depletes cardiolipin and destabilizes respiratory chain supercomplexes and ATP synthase, a defect reversed by cardiolipin synthase overexpression [PMID:25764979, PMID:29733859, PMID:32788226]. Loss-of-function mutation in QIL1/MIC13 eliminates the MIC10–MIC26–MIC27–QIL1 subcomplex and produces aberrant cristae and respiratory chain deficiency in patient tissue [PMID:29618761].","teleology":[{"year":2013,"claim":"Established APOOL/MIC27 as a cardiolipin-binding inner membrane protein integral to the MICOS/MINOS complex, answering whether this protein had a defined mitochondrial role.","evidence":"Complexome profiling, in vitro lipid-binding assay, Co-IP, and knockdown/overexpression with morphology and respiration readouts in human cells","pmids":["23704930"],"confidence":"High","gaps":["Did not resolve subcomplex membership within MICOS","Did not define the structural basis of cardiolipin selectivity"]},{"year":2015,"claim":"Placed MIC27 architecturally within a distinct MIC10/MIC12/MIC27 subcomplex separate from the MIC60/MIC19 module, and showed its assembly depends on cardiolipin and respiratory complexes.","evidence":"Yeast genetic deletions, complexome profiling, and respiratory growth assays; complemented by human knockdown studies of MICOS/MIB subunits","pmids":["25918844","25781180"],"confidence":"High","gaps":["Conflicting reports on whether MIC27 depletion alone alters cristae morphology","Did not establish the assembly trigger linking respiratory complexes to subcomplex formation"]},{"year":2015,"claim":"Defined the antagonistic, reciprocal regulation between MIC27 and MIC26 and linked both to MIC10 and the cardiolipin remodeling enzyme tafazzin.","evidence":"Bidirectional miRNA knockdown, overexpression, Co-IP, and western blot for protein-level changes","pmids":["25764979"],"confidence":"High","gaps":["Mechanism of reciprocal protein-level control not defined","Direct tafazzin interaction not established"]},{"year":2016,"claim":"Determined the MICOS assembly hierarchy, showing MIC13/QIL1 is required for integration of MIC27 and that MIC27 functions to stabilize MIC10 oligomers.","evidence":"CRISPR/Cas9 MIC13 knockout, yeast genetic deletion, complexome profiling, blue-native PAGE, and electron microscopy","pmids":["27479602","26968360"],"confidence":"High","gaps":["Did not resolve how MIC27 physically stabilizes MIC10 oligomers","Structural model of the subcomplex absent"]},{"year":2017,"claim":"Connected MIC27 to bioenergetic membrane shaping by showing it promotes F1FO-ATP synthase oligomerization and crista junction formation, partially compensating for MIC60 loss.","evidence":"Yeast genetic deletion, complexome profiling, chemical crosslinking of MIC10 to MIC27, blue-native PAGE, and electron microscopy","pmids":["28845423"],"confidence":"High","gaps":["Mechanism coupling MICOS to ATP synthase oligomers not fully defined","Crosslink demonstrates proximity but not interface architecture"]},{"year":2018,"claim":"Demonstrated mechanistically that MIC27 and cardiolipin stabilize MIC10 oligomers while MIC26 destabilizes them, linking MIC27 lipid binding to scaffold regulation.","evidence":"Yeast single and combined MIC26/MIC27 deletions, blue-native PAGE, and cardiolipin manipulation","pmids":["29733859"],"confidence":"High","gaps":["Did not establish whether MIC27 acts via direct cardiolipin presentation to MIC10"]},{"year":2018,"claim":"Provided human disease validation that the MIC10–MIC26–MIC27–QIL1 subcomplex is lost in QIL1/MIC13 deficiency, causing cristae and respiratory chain defects.","evidence":"Patient genetic analysis, western blot of MICOS subunits, tissue electron microscopy, and OXPHOS enzyme activity assays","pmids":["29618761"],"confidence":"Medium","gaps":["Single case without in vitro reconstitution","MIC27-specific contribution to phenotype not isolated from QIL1 loss"]},{"year":2019,"claim":"Established the mitochondrial import route of MIC27, showing it uses the presequence pathway distinct from the MIA pathway used by Mic19.","evidence":"In vitro mitochondrial import assays with radiolabeled precursors and inhibitors in yeast","pmids":["30718713"],"confidence":"Medium","gaps":["Single-lab in vitro study","Human MIC27 import not directly tested"]},{"year":2020,"claim":"Showed MIC26 and MIC27 act cooperatively as late-assembling MICOS subunits whose combined loss depletes cardiolipin and destabilizes OXPHOS supercomplexes, reversible by cardiolipin synthase.","evidence":"CRISPR/Cas9 single and double knockouts in human cells with complexome profiling, STED nanoscopy, blue-native PAGE, lipidomics, and cardiolipin synthase rescue; supported by a Drosophila ortholog knockdown model","pmids":["32788226","33268479"],"confidence":"High","gaps":["Did not separate direct cardiolipin-binding from cardiolipin-level regulation","Tissue-specific consequences in mammals not addressed"]},{"year":2023,"claim":"Definitively established MIC27 as an exclusively mitochondrial, non-glycosylated MICOS subunit, ruling out a glycosylated extramitochondrial isoform.","evidence":"CRISPR/Cas9 knockout across four human cell lines, glycosylation-site mutagenesis, multiple antibodies, and mass spectrometry of gel bands","pmids":["37279200"],"confidence":"High","gaps":["Did not address whether other post-translational modifications regulate MIC27"]},{"year":2025,"claim":"Mapped the molecular neighbourhood of MIC27 within MICOS, identifying proximal OXPHOS subunits, translocases, ribosomal proteins, and solute carriers.","evidence":"APEX2 proximity biotinylation in MIC27 knockout human cells with electron microscopy and STED validation (preprint)","pmids":["bio_10.1101_2025.05.20.655052"],"confidence":"Medium","gaps":["Preprint without functional follow-up for most proximal proteins","Proximity does not establish direct physical interaction"]},{"year":null,"claim":"How MIC27 cardiolipin binding is structurally coupled to MIC10 oligomer stabilization and ATP synthase oligomerization at the atomic level remains unresolved.","evidence":"","pmids":[],"confidence":"High","gaps":["No high-resolution structure of the MIC10/MIC12/MIC27 subcomplex","Direct lipid-presentation mechanism untested","Mammalian tissue-level physiological roles incompletely defined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[0,9]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[7,8]}],"localization":[],"pathway":[{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[1,8,12]},{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[12]}],"complexes":["MICOS complex","MIC10/MIC12/MIC27 subcomplex","MICOS/MIB complex"],"partners":["MIC10","MIC26","MIC60","MIC13","SAMM50","MIC19","MIC12"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q6UXV4","full_name":"MICOS complex subunit MIC27","aliases":["Apolipoprotein O-like","Protein FAM121A"],"length_aa":268,"mass_kda":29.2,"function":"Component of the MICOS complex, a large protein complex of the mitochondrial inner membrane that plays crucial roles in the maintenance of crista junctions, inner membrane architecture, and formation of contact sites to the outer membrane. Specifically binds to cardiolipin (in vitro) but not to the precursor lipid phosphatidylglycerol. Plays a crucial role in crista junction formation and mitochondrial function (PubMed:23704930), (PubMed:25764979)","subcellular_location":"Mitochondrion inner membrane; Mitochondrion","url":"https://www.uniprot.org/uniprotkb/Q6UXV4/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/APOOL","classification":"Not Classified","n_dependent_lines":8,"n_total_lines":1208,"dependency_fraction":0.006622516556291391},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/APOOL","total_profiled":1310},"omim":[{"mim_id":"616658","title":"MITOCHONDRIAL CONTACT SITE AND CRISTAE ORGANIZING SYSTEM, 13-KD SUBUNIT; MICOS13","url":"https://www.omim.org/entry/616658"},{"mim_id":"616574","title":"MITOCHONDRIAL CONTACT SITE AND CRISTAE ORGANIZING SYSTEM, 10-KD SUBUNIT; MICOS10","url":"https://www.omim.org/entry/616574"},{"mim_id":"300955","title":"APOLIPOPROTEIN O-LIKE; APOOL","url":"https://www.omim.org/entry/300955"},{"mim_id":"300753","title":"APOLIPOPROTEIN O; APOO","url":"https://www.omim.org/entry/300753"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Enhanced","locations":[{"location":"Mitochondria","reliability":"Enhanced"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/APOOL"},"hgnc":{"alias_symbol":["UNQ8193","AAIR8193","Mic27","MICOS27"],"prev_symbol":["CXorf33","FAM121A"]},"alphafold":{"accession":"Q6UXV4","domains":[{"cath_id":"-","chopping":"110-153","consensus_level":"medium","plddt":91.0236,"start":110,"end":153},{"cath_id":"1.20.5","chopping":"62-107","consensus_level":"medium","plddt":90.2828,"start":62,"end":107},{"cath_id":"1.20.5","chopping":"156-188","consensus_level":"medium","plddt":89.1845,"start":156,"end":188}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q6UXV4","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q6UXV4-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q6UXV4-F1-predicted_aligned_error_v6.png","plddt_mean":70.75},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=APOOL","jax_strain_url":"https://www.jax.org/strain/search?query=APOOL"},"sequence":{"accession":"Q6UXV4","fasta_url":"https://rest.uniprot.org/uniprotkb/Q6UXV4.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q6UXV4/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q6UXV4"}},"corpus_meta":[{"pmid":"25918844","id":"PMC_25918844","title":"MICOS 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biogenesis","date":"2025-05-21","source":"bioRxiv","url":"https://doi.org/10.1101/2025.05.20.655052","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":14081,"output_tokens":3828,"usd":0.049832,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":11606,"output_tokens":3651,"usd":0.074652,"stage2_stop_reason":"end_turn"},"total_usd":0.124484,"stage1_batch_id":"msgbatch_0179Z2pxRYBsXi2xADneafRw","stage2_batch_id":"msgbatch_01LaY9ZaVdgjWArcZo9eqQE5","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2013,\n      \"finding\": \"APOOL (MIC27) is a mitochondrial inner membrane protein facing the intermembrane space that specifically binds cardiolipin in vitro but not its precursor phosphatidylglycerol, and physically interacts with MINOS complex subunits Mitofilin, MINOS1, and SAMM50.\",\n      \"method\": \"Complexome profiling, lipid-binding in vitro assay, co-immunoprecipitation, overexpression/knockdown with mitochondrial morphology and oxygen consumption readouts\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (complexome profiling, lipid-binding assay, Co-IP, functional KD/OE) in a single focused study establishing direct physical and functional interactions\",\n      \"pmids\": [\"23704930\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Overexpression of APOOL causes mitochondrial fragmentation and reduced basal oxygen consumption rate with altered cristae morphology; downregulation impairs mitochondrial respiration and causes major cristae morphology alterations.\",\n      \"method\": \"Overexpression and miRNA-mediated knockdown with electron microscopy (cristae morphology), oxygen consumption rate measurement\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — loss-of-function and gain-of-function with defined morphological and functional phenotypic readouts in the same study\",\n      \"pmids\": [\"23704930\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"APOOL (MIC27) is a component of the Mic27/Mic10/Mic12 MICOS subcomplex, whose assembly is dependent on respiratory complexes and the mitochondrial lipid cardiolipin, forming a subcomplex independent of the Mic60/Mic19 subcomplex.\",\n      \"method\": \"Genetic deletion of MICOS subunits in yeast, complexome profiling, respiratory growth assays\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — epistatic genetic analysis with multiple single and double deletions plus complexome profiling; replicated independently from the Weber 2013 study\",\n      \"pmids\": [\"25918844\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Loss of QIL1 (MIC13) results in degradation of MIC27 (APOOL) along with MIC10 and MIC26, while the MIC60-MIC19-MIC25 subcomplex accumulates, placing MIC27 in a QIL1-dependent MICOS subcomplex.\",\n      \"method\": \"Quantitative proteomics after QIL1 depletion, co-immunoprecipitation, functional respiration assays\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — quantitative proteomics combined with Co-IP and functional assays, establishing pathway position of MIC27 within MICOS architecture\",\n      \"pmids\": [\"25997101\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"MIC27 (APOOL) is a periphery subunit of the human MICOS/MIB complex whose depletion does not affect cristae morphology or stability of other MICOS components, unlike the core subunits MIC60, MIC19, and SAM50.\",\n      \"method\": \"Knockdown cell lines for most MICOS/MIB components, electron microscopy, western blot for complex stability\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — systematic knockdown across subunits with defined phenotypic readout, single lab, partially contradicts other reports on MIC27 importance\",\n      \"pmids\": [\"25781180\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"MIC26 and MIC27 regulate each other's protein levels in an antagonistic manner; MIC26 physically interacts with MIC27 and other MICOS subunits (MIC60, MIC10), and both are positively correlated with MIC10 levels and tafazzin (a cardiolipin remodeling enzyme).\",\n      \"method\": \"miRNA-mediated knockdown, overexpression, co-immunoprecipitation, western blot for protein level changes\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal regulation shown by bidirectional KD experiments with multiple orthogonal readouts; replicated in subsequent studies\",\n      \"pmids\": [\"25764979\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"MIC13 (QIL1) is required for the assembly of MIC27 (APOOL) into the MICOS complex; MIC13 knockout cells show complete loss of crista junctions and loss of MIC27 from the complex, while the MIC60/MIC19/MIC25 subcomplex remains intact.\",\n      \"method\": \"CRISPR/Cas9 knockout, complexome profiling, electron microscopy\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — first complete KO cell line for MIC13 with complexome profiling and EM; defines assembly hierarchy placing MIC27 downstream of MIC13\",\n      \"pmids\": [\"27479602\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"MIC27 (APOOL) promotes stability of MIC10 oligomers within the membrane-sculpting MICOS subcomplex, while MIC12 is required for coupling the two MICOS subcomplexes; loss of MIC27 destabilizes the Mic10-containing subcomplex.\",\n      \"method\": \"Yeast genetic deletion, complexome profiling, blue-native PAGE\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic deletion with complexome profiling defining specific molecular role of MIC27 in MIC10 oligomer stabilization\",\n      \"pmids\": [\"26968360\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"MIC27 (APOOL) promotes oligomerization of the F1FO-ATP synthase and partially restores crista junction formation in cells lacking MIC60; MIC27 deletion impairs crista junction formation and alters cristae membrane curvature; a chemical crosslink of MIC10 to MIC27 was detected, supporting physical interaction within the MICOS-F1FO-ATP synthase interface.\",\n      \"method\": \"Yeast genetic deletion, complexome profiling, chemical crosslinking, electron microscopy, blue-native PAGE\",\n      \"journal\": \"Microbial cell (Graz, Austria)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — genetic epistasis, chemical crosslinking, complexome profiling, and EM providing multiple orthogonal lines of evidence for MIC27 role in ATP synthase oligomerization\",\n      \"pmids\": [\"28845423\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"MIC27 (APOOL) stabilizes MIC10 oligomers in an antagonistic relationship with MIC26 (which destabilizes MIC10 oligomers); cardiolipin also shows a stabilizing function on MIC10 oligomers, mechanistically linking MIC27's cardiolipin-binding activity to MICOS core scaffold regulation.\",\n      \"method\": \"Yeast genetic deletion of MIC26 and MIC27 (single and combined), blue-native PAGE for MIC10 oligomerization, cardiolipin manipulation\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis with combined deletions across multiple groups, directly demonstrating antagonistic roles and cardiolipin dependence\",\n      \"pmids\": [\"29733859\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"In a patient with loss-of-function mutation in QIL1/MIC13, the MIC10-MIC26-MIC27-QIL1 subcomplex is absent, resulting in aberrant cristae structure, loss of cristae junctions, and severely impaired respiratory chain complex activity in liver and muscle.\",\n      \"method\": \"Patient genetic analysis, western blot for MICOS subunit levels, electron microscopy of tissue, OXPHOS enzyme activity assays\",\n      \"journal\": \"Journal of human genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — human disease validation of MIC27 subcomplex membership, single case with multiple biochemical readouts but no in vitro reconstitution\",\n      \"pmids\": [\"29618761\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Yeast MIC27 uses the presequence pathway to reach the intermembrane space, establishing its mitochondrial import mechanism as distinct from the TIM40/MIA pathway used by Mic19.\",\n      \"method\": \"In vitro mitochondrial import assays with radiolabeled precursors, import inhibitors, yeast genetics\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro import assay with inhibitors, single lab study establishing import pathway\",\n      \"pmids\": [\"30718713\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"MIC26 and MIC27 (APOOL) double knockout (DKO) human cells show more severe concentric onion-like cristae with loss of crista junctions than either single KO, indicating overlapping roles; both proteins are dispensable for stability and integration of remaining MICOS subunits, suggesting late assembly into the complex. DKO cells show reduced cardiolipin levels and impaired integrity of respiratory chain supercomplexes and F1Fo-ATP synthase; overexpression of cardiolipin synthase in DKO restores respiratory complex stability.\",\n      \"method\": \"CRISPR/Cas9 single and double KO in human cells, complexome profiling, STED nanoscopy, blue-native PAGE, cardiolipin measurement, cardiolipin synthase overexpression rescue\",\n      \"journal\": \"Life science alliance\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple KO combinations with rescue experiment, multiple orthogonal methods (complexome profiling, STED, BN-PAGE, lipidomics), establishing cooperative cardiolipin-dependent mechanism\",\n      \"pmids\": [\"32788226\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"In Drosophila, the CG5903 gene encoding a MIC26-MIC27 ortholog colocalizes and functions with Mitofilin/MIC60 and QIL1/MIC13 as a MICOS component; knockdown causes loss of crista junctions, reduced mitochondrial membrane potential, fusion/fission imbalances, increased mitophagy, reduced mtDNA content, and muscle dysfunction.\",\n      \"method\": \"Drosophila in vivo knockdown, electron microscopy, live imaging, JC-1 membrane potential assay, mitophagy assays, climbing behavior test\",\n      \"journal\": \"Biology open\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo Drosophila model with multiple functional readouts, single lab, confirms MIC27 ortholog role in tissue homeostasis\",\n      \"pmids\": [\"33268479\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"MIC27 (APOOL) is exclusively localized in mitochondria as a 30 kDa non-glycosylated protein; predicted glycosylation site mutagenesis and mass spectrometry of candidate bands confirmed no high-molecular-weight glycosylated isoform exists, establishing MIC27 as purely a mitochondrial MICOS subunit.\",\n      \"method\": \"CRISPR/Cas9 KO in four human cell lines, four anti-MIC26 antibodies, tagged MIC26/MIC27 variants, glycosylation site mutagenesis, mass spectrometry of excised gel bands\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — mutagenesis, mass spectrometry, and multiple antibody validation across four cell lines definitively ruling out glycosylated isoform\",\n      \"pmids\": [\"37279200\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Proximity biotinylation (APEX2) fused to MIC27 in MIC27 knockout cells identified 119 common and 50 unique proximal proteins (MINDNet), including OXPHOS subunits, protein translocases, mitochondrial ribosomal proteins, and solute carrier transporters, defining the molecular neighbourhood of MIC27 within the MICOS complex.\",\n      \"method\": \"APEX2 proximity biotinylation in MIC27 knockout human cells validated by electron microscopy (DAB staining) and STED super-resolution nanoscopy\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — proximity proteomics with structural validation, preprint, single lab, no functional follow-up for most interactions\",\n      \"pmids\": [\"bio_10.1101_2025.05.20.655052\"],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"APOOL (MIC27) is a non-glycosylated, cardiolipin-binding inner mitochondrial membrane protein facing the intermembrane space that assembles late into the MICOS complex as a core component of the MIC10/MIC12/MIC27 membrane-sculpting subcomplex, where it stabilizes MIC10 oligomers and promotes F1FO-ATP synthase oligomerization, acting antagonistically to MIC26 to regulate cardiolipin levels and thereby maintain crista junction formation, cristae morphology, and respiratory chain supercomplex integrity; its assembly into MICOS requires MIC13/QIL1, and loss of both MIC26 and MIC27 cooperatively depletes cardiolipin and disrupts OXPHOS complex stability.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"APOOL (MIC27) is a non-glycosylated inner mitochondrial membrane protein of the MICOS complex that shapes cristae architecture by coupling cardiolipin binding to assembly of the membrane-sculpting MICOS scaffold [#0, #2, #14]. It faces the intermembrane space, specifically binds cardiolipin but not its precursor phosphatidylglycerol, and physically associates with MICOS/MIB subunits including Mitofilin/MIC60, MINOS1/MIC10, and SAMM50 [#0]. Within MICOS it belongs to the MIC10/MIC12/MIC27 subcomplex that assembles independently of the MIC60/MIC19 subcomplex and whose formation depends on cardiolipin and respiratory complexes [#2]; its integration requires MIC13/QIL1, whose loss triggers degradation of MIC27 together with MIC10 and MIC26 [#3, #6]. Mechanistically, MIC27 stabilizes MIC10 oligomers and promotes oligomerization of the F1FO-ATP synthase, thereby supporting crista junction formation and cristae membrane curvature [#7, #8]. MIC27 and MIC26 reciprocally regulate each other's levels and act antagonistically on MIC10 oligomer stability, and their combined loss cooperatively depletes cardiolipin and destabilizes respiratory chain supercomplexes and ATP synthase, a defect reversed by cardiolipin synthase overexpression [#5, #9, #12]. Loss-of-function mutation in QIL1/MIC13 eliminates the MIC10–MIC26–MIC27–QIL1 subcomplex and produces aberrant cristae and respiratory chain deficiency in patient tissue [#10].\",\n  \"teleology\": [\n    {\n      \"year\": 2013,\n      \"claim\": \"Established APOOL/MIC27 as a cardiolipin-binding inner membrane protein integral to the MICOS/MINOS complex, answering whether this protein had a defined mitochondrial role.\",\n      \"evidence\": \"Complexome profiling, in vitro lipid-binding assay, Co-IP, and knockdown/overexpression with morphology and respiration readouts in human cells\",\n      \"pmids\": [\"23704930\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve subcomplex membership within MICOS\", \"Did not define the structural basis of cardiolipin selectivity\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Placed MIC27 architecturally within a distinct MIC10/MIC12/MIC27 subcomplex separate from the MIC60/MIC19 module, and showed its assembly depends on cardiolipin and respiratory complexes.\",\n      \"evidence\": \"Yeast genetic deletions, complexome profiling, and respiratory growth assays; complemented by human knockdown studies of MICOS/MIB subunits\",\n      \"pmids\": [\"25918844\", \"25781180\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Conflicting reports on whether MIC27 depletion alone alters cristae morphology\", \"Did not establish the assembly trigger linking respiratory complexes to subcomplex formation\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Defined the antagonistic, reciprocal regulation between MIC27 and MIC26 and linked both to MIC10 and the cardiolipin remodeling enzyme tafazzin.\",\n      \"evidence\": \"Bidirectional miRNA knockdown, overexpression, Co-IP, and western blot for protein-level changes\",\n      \"pmids\": [\"25764979\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of reciprocal protein-level control not defined\", \"Direct tafazzin interaction not established\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Determined the MICOS assembly hierarchy, showing MIC13/QIL1 is required for integration of MIC27 and that MIC27 functions to stabilize MIC10 oligomers.\",\n      \"evidence\": \"CRISPR/Cas9 MIC13 knockout, yeast genetic deletion, complexome profiling, blue-native PAGE, and electron microscopy\",\n      \"pmids\": [\"27479602\", \"26968360\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve how MIC27 physically stabilizes MIC10 oligomers\", \"Structural model of the subcomplex absent\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Connected MIC27 to bioenergetic membrane shaping by showing it promotes F1FO-ATP synthase oligomerization and crista junction formation, partially compensating for MIC60 loss.\",\n      \"evidence\": \"Yeast genetic deletion, complexome profiling, chemical crosslinking of MIC10 to MIC27, blue-native PAGE, and electron microscopy\",\n      \"pmids\": [\"28845423\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism coupling MICOS to ATP synthase oligomers not fully defined\", \"Crosslink demonstrates proximity but not interface architecture\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Demonstrated mechanistically that MIC27 and cardiolipin stabilize MIC10 oligomers while MIC26 destabilizes them, linking MIC27 lipid binding to scaffold regulation.\",\n      \"evidence\": \"Yeast single and combined MIC26/MIC27 deletions, blue-native PAGE, and cardiolipin manipulation\",\n      \"pmids\": [\"29733859\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not establish whether MIC27 acts via direct cardiolipin presentation to MIC10\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Provided human disease validation that the MIC10–MIC26–MIC27–QIL1 subcomplex is lost in QIL1/MIC13 deficiency, causing cristae and respiratory chain defects.\",\n      \"evidence\": \"Patient genetic analysis, western blot of MICOS subunits, tissue electron microscopy, and OXPHOS enzyme activity assays\",\n      \"pmids\": [\"29618761\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single case without in vitro reconstitution\", \"MIC27-specific contribution to phenotype not isolated from QIL1 loss\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Established the mitochondrial import route of MIC27, showing it uses the presequence pathway distinct from the MIA pathway used by Mic19.\",\n      \"evidence\": \"In vitro mitochondrial import assays with radiolabeled precursors and inhibitors in yeast\",\n      \"pmids\": [\"30718713\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab in vitro study\", \"Human MIC27 import not directly tested\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Showed MIC26 and MIC27 act cooperatively as late-assembling MICOS subunits whose combined loss depletes cardiolipin and destabilizes OXPHOS supercomplexes, reversible by cardiolipin synthase.\",\n      \"evidence\": \"CRISPR/Cas9 single and double knockouts in human cells with complexome profiling, STED nanoscopy, blue-native PAGE, lipidomics, and cardiolipin synthase rescue; supported by a Drosophila ortholog knockdown model\",\n      \"pmids\": [\"32788226\", \"33268479\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not separate direct cardiolipin-binding from cardiolipin-level regulation\", \"Tissue-specific consequences in mammals not addressed\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Definitively established MIC27 as an exclusively mitochondrial, non-glycosylated MICOS subunit, ruling out a glycosylated extramitochondrial isoform.\",\n      \"evidence\": \"CRISPR/Cas9 knockout across four human cell lines, glycosylation-site mutagenesis, multiple antibodies, and mass spectrometry of gel bands\",\n      \"pmids\": [\"37279200\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not address whether other post-translational modifications regulate MIC27\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Mapped the molecular neighbourhood of MIC27 within MICOS, identifying proximal OXPHOS subunits, translocases, ribosomal proteins, and solute carriers.\",\n      \"evidence\": \"APEX2 proximity biotinylation in MIC27 knockout human cells with electron microscopy and STED validation (preprint)\",\n      \"pmids\": [\"bio_10.1101_2025.05.20.655052\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Preprint without functional follow-up for most proximal proteins\", \"Proximity does not establish direct physical interaction\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How MIC27 cardiolipin binding is structurally coupled to MIC10 oligomer stabilization and ATP synthase oligomerization at the atomic level remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No high-resolution structure of the MIC10/MIC12/MIC27 subcomplex\", \"Direct lipid-presentation mechanism untested\", \"Mammalian tissue-level physiological roles incompletely defined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [0, 9]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [7, 8]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005743\", \"supporting_discovery_ids\": [0, 14]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [1, 8, 12]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [12]}\n    ],\n    \"complexes\": [\"MICOS complex\", \"MIC10/MIC12/MIC27 subcomplex\", \"MICOS/MIB complex\"],\n    \"partners\": [\"MIC10\", \"MIC26\", \"MIC60\", \"MIC13\", \"SAMM50\", \"MIC19\", \"MIC12\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}