{"gene":"PERM1","run_date":"2026-06-10T05:19:53","timeline":{"discoveries":[{"year":2013,"finding":"PERM1 (Perm1) acts downstream of PGC-1α and ERRs in skeletal muscle to regulate expression of selective PGC-1/ERR target genes involved in glucose and lipid metabolism, energy transfer, and contractile function; silencing Perm1 in myotubes reduces respiratory capacity and diminishes PGC-1α-induced mitochondrial biogenesis.","method":"siRNA knockdown in cultured myotubes, respiratory capacity assays, gene expression analysis; genetic epistasis placing Perm1 downstream of PGC-1α/ERR","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean KD with defined cellular phenotype (respiration) and pathway placement via epistasis, single lab, multiple methods","pmids":["23836911"],"is_preprint":false},{"year":2015,"finding":"AAV1-mediated overexpression of Perm1 in adult mouse skeletal muscle in vivo increases mitochondrial content and oxidative capacity by 40–80%, increases capillary density, and increases fatigue resistance by ~31–33%, without prominent fiber-type composition changes.","method":"AAV1-mediated gene delivery in mice, mitochondrial content quantification, oxidative capacity assays, capillary density measurement, fatigue testing","journal":"FASEB journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo AAV gain-of-function with multiple orthogonal phenotypic readouts, replicates and extends in vitro findings from prior study","pmids":["26481306"],"is_preprint":false},{"year":2019,"finding":"Perm1 physically associates with CaMKII in skeletal muscle and promotes CaMKII activation; knockdown of Perm1 in mouse gastrocnemius via AAV-shRNA blunts exercise-induced CaMKII and p38 MAPK activation, reduces induction of oxidative metabolism regulators after acute exercise, and attenuates mitochondrial biogenesis after four weeks of voluntary training.","method":"Immunoprecipitation and mass spectrometry to identify Perm1-associated proteins; validated interaction with CaMKII; AAV-shRNA knockdown in vivo; treadmill exercise and voluntary wheel running with molecular readouts","journal":"Molecular metabolism","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP/MS identification of binding partner validated independently, plus in vivo KD with multiple defined molecular and physiological phenotypes","pmids":["30862473"],"is_preprint":false},{"year":2020,"finding":"Smyd1 (histone methyltransferase) directly occupies the Perm1 promoter in mouse heart, and Perm1 acts downstream of Smyd1 to regulate cardiac energetics; Perm1 overexpression rescues phenylephrine-induced downregulation of ERRα and its target Ndufv1 (Complex I); Perm1 dose-dependently activates the ERRα promoter and the ERRα target Ndufv1; siRNA knockdown of Perm1 reduces basal respiration and ATP production in cardiomyocytes.","method":"ChIP assay (Smyd1 at Perm1 promoter), adenovirus-mediated Perm1 overexpression, siRNA knockdown, Seahorse XF respiration assay, luciferase reporter gene assay","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP establishes direct promoter occupancy, multiple orthogonal methods (reporter assay, Seahorse, KD, OE) in single study","pmids":["32574189"],"is_preprint":false},{"year":2020,"finding":"ESRRG and PERM1 are induced early during cold-mediated brite/beige adipocyte formation and positively regulate mitochondrial capacity within the PGC-1α transcriptional network; increased expression of PERM1 supports brite/beige adipocyte formation in vitro and in vivo.","method":"Transcriptome profiling of inguinal adipocytes during cold exposure, gain-of-function overexpression in vitro and in vivo, mitochondrial capacity assays","journal":"Frontiers in endocrinology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — gain-of-function with phenotypic readout in vitro and in vivo, but limited mechanistic detail in abstract; single lab","pmids":["32595605"],"is_preprint":false},{"year":2021,"finding":"PERM1 interacts with the MICOS-MIB complex and with the intracellular adaptor protein ankyrin B (ANKB), which connects the cytoskeleton to the plasma membrane; PERM1 contains a C-terminal transmembrane helix anchoring it to the outer mitochondrial membrane; Perm1 ablation in mice reduces muscle force, decreases mitochondrial membrane potential and Complex I activity, and reduces subsarcolemmal mitochondria (SSM) numbers.","method":"Protein interaction study (Co-IP/pulldown), complexome profiling, Perm1 knockout mice, mitochondrial membrane potential measurements, Complex I activity assay, SSM quantification, transmembrane helix identification","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — multiple orthogonal methods (complexome profiling, Co-IP, structural domain identification, KO mouse phenotyping), published in peer-reviewed journal","pmids":["34385433"],"is_preprint":false},{"year":2021,"finding":"PERM1 associates with the outer mitochondrial membrane and is subject to proteasomal degradation regulated by phosphorylation of its PEST motif by casein kinase 2 (CK2); Perm1 ablation reduces lipin-1 protein expression, causes accumulation of specific phospholipid species, and leads to downregulation of mitochondrial transport proteins for amino acids and carnitines (SLC25A12/13/29/34, CPT2), with altered levels of lipid species, amino acids, and acylcarnitines in Perm1−/− mitochondria.","method":"Phosphoproteomics, identification of PEST motif phosphorylation by CK2, Perm1 knockout mice, isolation of Perm1-deficient mitochondria, proteomics, metabolomics, lipid analysis","journal":"Journal of molecular and cellular cardiology","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — phosphoproteomics identifies CK2-mediated PEST motif phosphorylation, KO mice with multiple orthogonal metabolic/proteomic readouts","pmids":["33549681"],"is_preprint":false},{"year":2021,"finding":"Perm1 interacts with PGC-1α in cardiomyocytes and enhances activation of PGC-1 and ERR; Perm1 overexpression increases mitochondrial DNA copy number and oxidative capacity in neonatal mouse cardiomyocytes and reduces damage from hypoxia/reoxygenation stress.","method":"Co-immunoprecipitation, mitochondrial DNA copy number quantification, Seahorse oxidative capacity assay, hypoxia/reoxygenation cell death assay in neonatal mouse cardiomyocytes","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP interaction plus multiple functional assays, single lab","pmids":["34029594"],"is_preprint":false},{"year":2022,"finding":"PERM1 physically interacts with PPARα and PGC-1α; PERM1 localizes to proximal PPAR response elements (PPREs) in endogenous promoters of fatty acid oxidation genes (ChIP assay); PERM1 promotes transcription via PPREs in a PPARα- and PGC-1α-dependent manner; Perm1 knockout mice show downregulation of genes involved in fatty acid and carbohydrate metabolism in the heart.","method":"Systemic Perm1 KO mouse generation, RNA-seq and pathway analysis, ChIP assay at PPRE-containing promoters, co-immunoprecipitation (PERM1 with PPARα and PGC-1α), reporter gene assay","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — KO mouse combined with ChIP (direct promoter occupancy), Co-IP (physical interaction), and reporter assay (functional consequence), multiple orthogonal methods","pmids":["36028747"],"is_preprint":false},{"year":2022,"finding":"PERM1 binds ERRα in cardiomyocytes and the mouse heart; PERM1 localizes to and activates ERR target promoters partly through ERRα; PERM1 functions as a transcriptional coactivator whose activity requires PGC-1α, BAG6, and KANK2 (identified as binding partners by mass spectrometry); Perm1−/− hearts show reduced ejection fraction, reduced phosphocreatine-to-ATP ratio, downregulation of oxidative phosphorylation proteins, and upregulation of glycolysis/polyol pathway.","method":"Perm1 KO mice, echocardiography, phosphocreatine-to-ATP ratio (31P-NMR or equivalent), proteomics, metabolomics, co-immunoprecipitation (PERM1-ERRα), mass spectrometry (binding partners: BAG6, KANK2), DNA binding assay, reporter gene assay, mammalian one-hybrid assay","journal":"Frontiers in cardiovascular medicine","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — KO mouse with multiple physiological and metabolic readouts combined with Co-IP, MS interactome, and functional reporter assays","pmids":["36419485"],"is_preprint":false},{"year":2024,"finding":"PERM1 overexpression decreases total O-GlcNAcylated protein levels by decreasing OGT expression (via interaction with transcription repressor E2F1 to suppress Ogt promoter activity) and increasing OGA expression; excessive O-GlcNAcylation caused by loss of PERM1 increases O-GlcNAcylation of PGC-1α and causes dissociation of PGC-1α from PPARα; PERM1 overexpression restores mitochondrial respiration impaired by elevated O-GlcNAcylation.","method":"PERM1 overexpression in cardiomyocytes, luciferase reporter assay (Ogt promoter), co-immunoprecipitation (PERM1-E2F1; PGC-1α-PPARα), Oga siRNA knockdown, Seahorse mitochondrial respiration assay, Western blot for O-GlcNAcylation","journal":"Journal of molecular and cellular cardiology","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — multiple orthogonal methods including reporter assay, Co-IP, KD, and functional respiration measurements establishing a defined mechanistic pathway","pmids":["39581161"],"is_preprint":false},{"year":2024,"finding":"AAV-mediated Perm1 gene delivery in mice enhances cardiac contractility and mitochondrial biogenesis; PERM1 physically interacts with troponin C (TnC) and AAV-Perm1 upregulates TnC protein levels, revealing a role for PERM1 in regulating cardiac contractility.","method":"AAV9-mediated Perm1 overexpression in mice, echocardiography, co-immunoprecipitation (PERM1-TnC), Western blot for TnC, mitochondrial DNA copy number","journal":"American journal of physiology. Heart and circulatory physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo AAV gain-of-function with Co-IP validation of novel interaction, single lab","pmids":["39269449"],"is_preprint":false},{"year":2025,"finding":"Perm1 activates the Nrf2 antioxidant pathway by promoting cysteine oxidation of Keap1, which reduces Keap1-Nrf2 interaction and inhibits Cul3-mediated ubiquitination/degradation of Nrf2; Cys121 and Cys746 in Perm1 are critical for Keap1 oxidation and cardioprotection against ischemia/reperfusion injury.","method":"Perm1 KO and overexpression in mouse myocardium, IR injury model, cysteine oxidation assay of Keap1, Co-immunoprecipitation (Keap1-Nrf2), Cul3-mediated degradation assay, site-directed mutagenesis of Perm1 Cys121 and Cys746, Nrf2 target gene expression","journal":"JCI insight","confidence":"High","confidence_rationale":"Tier 1 / Strong — mutagenesis identifies critical cysteines, multiple functional assays (Co-IP, degradation, gene expression, IR injury), loss- and gain-of-function","pmids":["42118582"],"is_preprint":false},{"year":2025,"finding":"PERM1 is a direct downstream target of PRDM16; AAV9-Perm1 treatment of cardiac-specific Prdm16 KO mice improves contractile parameters, reduces LV dilation, and extends survival; Perm1 co-operates with PGC-1α downstream of PRDM16 to regulate fatty acid metabolism; co-immunoprecipitation shows PERM1 interacts with creatine kinase and troponin C.","method":"Transcriptomics and proteomics of cardiac-specific Prdm16 KO mice and iPSC-CMs, AAV9-Perm1 neonatal delivery, echocardiography, survival analysis, Co-immunoprecipitation (PERM1-creatine kinase; PERM1-TnC)","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo KO/AAV rescue with multiple phenotypic readouts and Co-IP; preprint, not yet peer-reviewed","pmids":["42039588"],"is_preprint":true},{"year":2025,"finding":"AAV9-PERM1 in a pressure-overload (TAC) mouse model preserves left ventricular ejection fraction, abrogates cardiac hypertrophy and fibrosis, preserves mitochondrial DNA copy number and TFAM levels, improves mitochondrial respiration, and suppresses TAC-induced O-GlcNAcylation; co-immunoprecipitation confirms PERM1 interactions with creatine kinase and troponin C.","method":"AAV9-PERM1 delivery before TAC surgery, echocardiography, mitochondrial DNA quantification, Seahorse mitochondrial respiration, histology (fibrosis/hypertrophy), Western blot (O-GlcNAcylation, TFAM), Co-immunoprecipitation","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — comprehensive in vivo AAV gain-of-function with multiple orthogonal readouts; preprint not yet peer-reviewed","pmids":["41256646"],"is_preprint":true},{"year":2024,"finding":"In human skeletal muscle, PERM1 protein localizes to the perinuclear region and is enriched in mitochondria (confirmed by immunolabeling, microscopy, and subcellular fractionation); HIIT training increases PERM1 isoform 2 protein and its target CKMT2.","method":"Immunolabeling, fluorescence microscopy, subcellular fractionation of human muscle biopsies, Western blotting","journal":"Applied physiology, nutrition, and metabolism","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct subcellular fractionation plus imaging establishing mitochondrial/perinuclear localization in human tissue","pmids":["41759080"],"is_preprint":false},{"year":2025,"finding":"NOR-1 (NR4A3) drives PERM1 expression, and PERM1 in turn mediates NOR-1-dependent upregulation of myoglobin; NOR-1 overexpression in aged muscle increases PERM1, CKMT2, and myoglobin levels and enhances mitochondrial respiration.","method":"In vitro NOR-1 knockdown in C2C12 myotubes, NOR-1 overexpression in aged mouse muscle via electroporation/AAV, Western blotting, mitochondrial respiration assay, gene expression analysis","journal":"FASEB journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss- and gain-of-function in vitro and in vivo establishing NOR-1–PERM1–myoglobin axis, single lab","pmids":["40235231"],"is_preprint":false}],"current_model":"PERM1 is a striated muscle-specific outer mitochondrial membrane protein that acts downstream of PGC-1α/ERR (and PRDM16/Smyd1/NOR-1) transcriptional programs to promote mitochondrial biogenesis and oxidative capacity; it physically associates with the MICOS-MIB complex and ankyrin B to anchor subsarcolemmal mitochondria to the sarcolemma, interacts with CaMKII to regulate exercise-induced signaling, binds ERRα/PPARα/PGC-1α to coactivate fatty acid oxidation and energy metabolism genes, suppresses O-GlcNAcylation via E2F1-mediated repression of OGT, activates Nrf2 antioxidant defense through cysteine oxidation of Keap1, and interacts with troponin C and creatine kinase to couple mitochondrial energetics to contractility."},"narrative":{"mechanistic_narrative":"PERM1 is a striated muscle-enriched regulator of mitochondrial biogenesis and oxidative metabolism that functions downstream of the PGC-1α/ERR transcriptional program to set respiratory and contractile capacity in skeletal and cardiac muscle [PMID:23836911, PMID:26481306]. It is an outer mitochondrial membrane protein bearing a C-terminal transmembrane helix, localizing to perinuclear and mitochondrial compartments, and its abundance is controlled by CK2-dependent phosphorylation of a PEST motif that targets it for proteasomal degradation [PMID:34385433, PMID:33549681, PMID:41759080]. At the membrane, PERM1 physically associates with the MICOS-MIB complex and the adaptor ankyrin B to support subsarcolemmal mitochondrial number, membrane potential, and Complex I activity, with loss reducing muscle force [PMID:34385433]. Functionally, PERM1 acts as a transcriptional coactivator: it binds PGC-1α, ERRα, and PPARα, occupies ERR and PPAR response elements at promoters of oxidative phosphorylation and fatty acid oxidation genes, and requires partners including BAG6 and KANK2 for full coactivator activity [PMID:34029594, PMID:36028747, PMID:36419485]. It is positioned downstream of the muscle transcription factors Smyd1, PRDM16, and NOR-1, linking these programs to energetics, fatty acid metabolism, and myoglobin induction [PMID:32574189, PMID:42039588, PMID:40235231]. PERM1 additionally couples energy state to contractility through interactions with CaMKII, troponin C, and creatine kinase, regulating exercise-induced signaling and contractile protein levels [PMID:30862473, PMID:39269449, PMID:42039588]. It protects the heart by two further mechanisms: suppressing O-GlcNAcylation through E2F1-mediated repression of OGT (preserving PGC-1α/PPARα association) and activating Nrf2 antioxidant defense via cysteine oxidation of Keap1 at PERM1 residues Cys121 and Cys746, conferring resistance to ischemia/reperfusion injury [PMID:39581161, PMID:42118582]. Gain-of-function delivery of PERM1 increases mitochondrial content, oxidative capacity, and fatigue resistance and preserves cardiac function under hypoxia, pressure overload, and PRDM16 deficiency [PMID:26481306, PMID:34029594, PMID:42039588, PMID:41256646].","teleology":[{"year":2013,"claim":"Established PERM1 as a functional effector within the PGC-1α/ERR program rather than just a co-regulated gene, by showing its loss impairs respiration and PGC-1α-driven mitochondrial biogenesis.","evidence":"siRNA knockdown in myotubes with respiratory assays and genetic epistasis","pmids":["23836911"],"confidence":"Medium","gaps":["Molecular activity (coactivator vs structural) undefined","No in vivo confirmation at this stage","No subcellular localization established"]},{"year":2015,"claim":"Demonstrated that PERM1 is sufficient in vivo to boost oxidative capacity and physiological performance, validating it as a positive driver of muscle mitochondrial content.","evidence":"AAV1 overexpression in adult mouse skeletal muscle with mitochondrial, capillary, and fatigue readouts","pmids":["26481306"],"confidence":"High","gaps":["Mechanism of mitochondrial increase not resolved","No protein partners identified","No cardiac data"]},{"year":2019,"claim":"Identified CaMKII as a PERM1 binding partner and placed PERM1 in exercise-responsive signaling, explaining how it transduces contractile activity into adaptive mitochondrial gene programs.","evidence":"Co-IP/MS partner identification plus AAV-shRNA knockdown with exercise paradigms","pmids":["30862473"],"confidence":"High","gaps":["Direct vs indirect CaMKII binding not dissected","How PERM1 promotes CaMKII activation mechanistically unclear"]},{"year":2020,"claim":"Embedded PERM1 in cardiac and adipocyte transcriptional networks, showing Smyd1 and ESRRG drive PERM1 and that PERM1 feeds back to activate ERRα and its targets to set energetics.","evidence":"ChIP, reporter assays, Seahorse, and gain/loss-of-function in cardiomyocytes and beige adipocytes","pmids":["32574189","32595605"],"confidence":"High","gaps":["Whether PERM1 binds ERRα directly not yet shown here","Adipocyte mechanism limited in detail"]},{"year":2021,"claim":"Defined PERM1 as an outer mitochondrial membrane protein with a transmembrane helix that physically anchors subsarcolemmal mitochondria via MICOS-MIB and ankyrin B, and is turned over by CK2/PEST-dependent proteasomal degradation, establishing both its topology and structural role.","evidence":"Complexome profiling, Co-IP, transmembrane helix mapping, phosphoproteomics, and KO mouse phenotyping with metabolomics","pmids":["34385433","33549681","34029594"],"confidence":"High","gaps":["Stoichiometry within MICOS-MIB unknown","How a mitochondrial membrane protein also acts in transcription not reconciled","Direct CK2 phosphosite consequences on localization untested"]},{"year":2022,"claim":"Resolved PERM1's transcriptional coactivator mechanism by showing it binds PPARα, PGC-1α, and ERRα, occupies PPRE/ERR promoters, and requires BAG6 and KANK2, with KO hearts losing fatty acid and OXPHOS gene expression and contractile function.","evidence":"Perm1 KO mice, ChIP at PPREs, Co-IP, mass spectrometry interactome, reporter and one-hybrid assays","pmids":["36028747","36419485"],"confidence":"High","gaps":["How membrane-anchored PERM1 reaches chromatin unresolved","Roles of BAG6 and KANK2 in coactivation mechanistically undefined"]},{"year":2024,"claim":"Uncovered PERM1 control of O-GlcNAcylation and contractility, showing it represses OGT via E2F1 to protect PGC-1α/PPARα association and interacts with troponin C to regulate contractile protein levels.","evidence":"Cardiomyocyte overexpression, Ogt reporter assays, Co-IP (E2F1, TnC), and AAV9 in vivo contractility studies; human muscle fractionation/imaging","pmids":["39581161","39269449","41759080"],"confidence":"High","gaps":["Whether OGA upregulation is direct or secondary unclear","Functional consequence of TnC binding on calcium sensitivity untested"]},{"year":2025,"claim":"Established PERM1 as a redox-active cardioprotective protein and a node downstream of PRDM16 and NOR-1, defining critical cysteines for Keap1 oxidation/Nrf2 activation and extending PERM1's protective effects to ischemia, pressure overload, and PRDM16 loss.","evidence":"KO/overexpression with IR and TAC models, site-directed mutagenesis of Cys121/Cys746, Keap1-Nrf2 Co-IP and degradation assays, AAV9 rescue of Prdm16 KO, and NOR-1 loss/gain-of-function","pmids":["42118582","42039588","41256646","40235231"],"confidence":"High","gaps":["TAC and PRDM16 rescue studies are preprints not yet peer-reviewed","How cysteine oxidation of PERM1 is itself triggered unknown","Integration of redox sensing with its membrane/transcriptional roles unresolved"]},{"year":null,"claim":"It remains unresolved how a single outer mitochondrial membrane protein with a C-terminal transmembrane anchor simultaneously functions as a nuclear transcriptional coactivator, a structural mitochondrial tether, and a Keap1 redox sensor.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model linking the membrane-anchored and chromatin-associated pools","Mechanism of trafficking between compartments unknown","No human disease link established in the corpus"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[7,8,9]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[2,10,12]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[5]},{"term_id":"GO:0140299","term_label":"molecular sensor activity","supporting_discovery_ids":[12]}],"localization":[{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[5,6,15]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[8,9,10]}],"pathway":[{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[0,8,9]},{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[1,5,7]},{"term_id":"R-HSA-8953897","term_label":"Cellular responses to stimuli","supporting_discovery_ids":[12]},{"term_id":"R-HSA-397014","term_label":"Muscle contraction","supporting_discovery_ids":[11,13]}],"complexes":["MICOS-MIB complex"],"partners":["PPARGC1A","ESRRA","PPARA","CAMK2","ANK2","KEAP1","E2F1","TNNC1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q5SV97","full_name":"PGC-1 and ERR-induced regulator in muscle protein 1","aliases":["PPARGC1 and ESRR-induced regulator in muscle 1","Peroxisome proliferator-activated receptor gamma coactivator 1 and estrogen-related receptor-induced regulator in muscle 1"],"length_aa":790,"mass_kda":81.4,"function":"Regulates the expression of selective PPARGC1A/B and ESRRA/B/G target genes with roles in glucose and lipid metabolism, energy transfer, contractile function, muscle mitochondrial biogenesis and oxidative capacity. Required for the efficient induction of MT-CO2, MT-CO3, COX4I1, TFB1M, TFB2M, POLRMT and SIRT3 by PPARGC1A. Positively regulates the PPARGC1A/ESRRG-induced expression of CKMT2, TNNI3 and SLC2A4 and negatively regulates the PPARGC1A/ESRRG-induced expression of PDK4","subcellular_location":"Cytoplasm; Nucleus","url":"https://www.uniprot.org/uniprotkb/Q5SV97/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/PERM1","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":77,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/PERM1","total_profiled":1310},"omim":[{"mim_id":"615921","title":"PPARGC1- AND ESRR-INDUCED REGULATOR, MUSCLE, 1; PERM1","url":"https://www.omim.org/entry/615921"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"},{"location":"Nuclear bodies","reliability":"Additional"}],"tissue_specificity":"Group enriched","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"heart muscle","ntpm":64.2},{"tissue":"skeletal muscle","ntpm":168.4},{"tissue":"tongue","ntpm":126.9}],"url":"https://www.proteinatlas.org/search/PERM1"},"hgnc":{"alias_symbol":["MGC13275","RP11-54O7.8"],"prev_symbol":["C1orf170"]},"alphafold":{"accession":"Q5SV97","domains":[{"cath_id":"1.10.287","chopping":"730-779","consensus_level":"medium","plddt":70.8278,"start":730,"end":779}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q5SV97","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q5SV97-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q5SV97-F1-predicted_aligned_error_v6.png","plddt_mean":44.44},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=PERM1","jax_strain_url":"https://www.jax.org/strain/search?query=PERM1"},"sequence":{"accession":"Q5SV97","fasta_url":"https://rest.uniprot.org/uniprotkb/Q5SV97.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q5SV97/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q5SV97"}},"corpus_meta":[{"pmid":"23836911","id":"PMC_23836911","title":"Peroxisome proliferator-activated receptor γ coactivator 1 (PGC-1)- and estrogen-related receptor (ERR)-induced regulator in muscle 1 (Perm1) is a tissue-specific regulator of oxidative capacity in skeletal muscle cells.","date":"2013","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/23836911","citation_count":98,"is_preprint":false},{"pmid":"26481306","id":"PMC_26481306","title":"Perm1 enhances mitochondrial biogenesis, oxidative capacity, and fatigue resistance in adult skeletal muscle.","date":"2015","source":"FASEB journal : official publication of the Federation of American Societies for Experimental Biology","url":"https://pubmed.ncbi.nlm.nih.gov/26481306","citation_count":53,"is_preprint":false},{"pmid":"30862473","id":"PMC_30862473","title":"Perm1 regulates CaMKII activation and shapes skeletal muscle responses to endurance exercise training.","date":"2019","source":"Molecular metabolism","url":"https://pubmed.ncbi.nlm.nih.gov/30862473","citation_count":31,"is_preprint":false},{"pmid":"34029594","id":"PMC_34029594","title":"Perm1 promotes cardiomyocyte mitochondrial biogenesis and protects against hypoxia/reoxygenation-induced damage in mice.","date":"2021","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/34029594","citation_count":29,"is_preprint":false},{"pmid":"32574189","id":"PMC_32574189","title":"Perm1 regulates cardiac energetics as a downstream target of the histone methyltransferase Smyd1.","date":"2020","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/32574189","citation_count":29,"is_preprint":false},{"pmid":"34385433","id":"PMC_34385433","title":"PERM1 interacts with the MICOS-MIB complex to connect the mitochondria and sarcolemma via ankyrin B.","date":"2021","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/34385433","citation_count":19,"is_preprint":false},{"pmid":"36028747","id":"PMC_36028747","title":"PERM1 regulates genes involved in fatty acid metabolism in the heart by interacting with PPARα and PGC-1α.","date":"2022","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/36028747","citation_count":18,"is_preprint":false},{"pmid":"36419485","id":"PMC_36419485","title":"PERM1 regulates energy metabolism in the heart via ERRα/PGC-1α axis.","date":"2022","source":"Frontiers in cardiovascular medicine","url":"https://pubmed.ncbi.nlm.nih.gov/36419485","citation_count":18,"is_preprint":false},{"pmid":"32595605","id":"PMC_32595605","title":"ESRRG and PERM1 Govern Mitochondrial Conversion in Brite/Beige Adipocyte Formation.","date":"2020","source":"Frontiers in endocrinology","url":"https://pubmed.ncbi.nlm.nih.gov/32595605","citation_count":14,"is_preprint":false},{"pmid":"33549681","id":"PMC_33549681","title":"Phosphoproteomics of the developing heart identifies PERM1 - An outer mitochondrial membrane protein.","date":"2021","source":"Journal of molecular and cellular cardiology","url":"https://pubmed.ncbi.nlm.nih.gov/33549681","citation_count":14,"is_preprint":false},{"pmid":"29781744","id":"PMC_29781744","title":"Endurance training alters YKL40, PERM1, and HSP70 skeletal muscle protein contents in men with type 2 diabetes mellitus.","date":"2018","source":"Endocrine research","url":"https://pubmed.ncbi.nlm.nih.gov/29781744","citation_count":11,"is_preprint":false},{"pmid":"38466466","id":"PMC_38466466","title":"The lncRNA lnc_AABR07044470.1 promotes the mitochondrial-damaged inflammatory response to neuronal injury via miR-214-3p/PERM1 axis in acute ischemic stroke.","date":"2024","source":"Molecular biology reports","url":"https://pubmed.ncbi.nlm.nih.gov/38466466","citation_count":7,"is_preprint":false},{"pmid":"39269449","id":"PMC_39269449","title":"Adeno-associated virus-mediated gene delivery of Perm1 enhances cardiac contractility in mice.","date":"2024","source":"American journal of physiology. Heart and circulatory physiology","url":"https://pubmed.ncbi.nlm.nih.gov/39269449","citation_count":5,"is_preprint":false},{"pmid":"39581161","id":"PMC_39581161","title":"PERM1 regulates mitochondrial energetics through O-GlcNAcylation in the heart.","date":"2024","source":"Journal of molecular and cellular cardiology","url":"https://pubmed.ncbi.nlm.nih.gov/39581161","citation_count":4,"is_preprint":false},{"pmid":"39457429","id":"PMC_39457429","title":"PERM1-An Emerging Transcriptional Regulator of Mitochondrial Biogenesis: A Systematic Review.","date":"2024","source":"Genes","url":"https://pubmed.ncbi.nlm.nih.gov/39457429","citation_count":3,"is_preprint":false},{"pmid":"40235231","id":"PMC_40235231","title":"NOR-1 Overexpression Elevates Myoglobin Expression via PERM1 and Enhances Mitochondrial Function and Endurance in Skeletal Muscles of Aged Mice.","date":"2025","source":"FASEB journal : official publication of the Federation of American Societies for Experimental Biology","url":"https://pubmed.ncbi.nlm.nih.gov/40235231","citation_count":3,"is_preprint":false},{"pmid":"35623593","id":"PMC_35623593","title":"Molecular mechanism of the ESRRG-PERM1-CKMT2 signal axis in ovariectomized female rats with OSAHS.","date":"2022","source":"Transplant immunology","url":"https://pubmed.ncbi.nlm.nih.gov/35623593","citation_count":1,"is_preprint":false},{"pmid":"41256646","id":"PMC_41256646","title":"PERM1 Gene Delivery via AAV Prevents Heart Failure in a Mouse Model of Pressure Overload.","date":"2025","source":"bioRxiv : the preprint server for biology","url":"https://pubmed.ncbi.nlm.nih.gov/41256646","citation_count":1,"is_preprint":false},{"pmid":"42039588","id":"PMC_42039588","title":"Perm1 Gene Therapy Mitigates PRDM16-Associated Cardiomyopathy.","date":"2026","source":"bioRxiv : the preprint server for biology","url":"https://pubmed.ncbi.nlm.nih.gov/42039588","citation_count":0,"is_preprint":false},{"pmid":"41759080","id":"PMC_41759080","title":"Regulation of PERM1 and select target genes in human skeletal muscle following fasting and exercise.","date":"2026","source":"Applied physiology, nutrition, and metabolism = Physiologie appliquee, nutrition et metabolisme","url":"https://pubmed.ncbi.nlm.nih.gov/41759080","citation_count":0,"is_preprint":false},{"pmid":"42118582","id":"PMC_42118582","title":"Perm1 enhances Nrf2-driven antioxidant defense through Keap1 oxidation during myocardial ischemia/reperfusion injury.","date":"2026","source":"JCI insight","url":"https://pubmed.ncbi.nlm.nih.gov/42118582","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2024.10.08.617184","title":"Does PERM1 Regulate Systolic Cardiac Function? A Game of Numbers","date":"2024-10-14","source":"bioRxiv","url":"https://doi.org/10.1101/2024.10.08.617184","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":14628,"output_tokens":5001,"usd":0.05945,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":13291,"output_tokens":3822,"usd":0.081003,"stage2_stop_reason":"end_turn"},"total_usd":0.140453,"stage1_batch_id":"msgbatch_013a8chtv3AWyTqv4z4sEF4C","stage2_batch_id":"msgbatch_01AHsuW63vinsvuTgzmQ3n62","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2013,\n      \"finding\": \"PERM1 (Perm1) acts downstream of PGC-1α and ERRs in skeletal muscle to regulate expression of selective PGC-1/ERR target genes involved in glucose and lipid metabolism, energy transfer, and contractile function; silencing Perm1 in myotubes reduces respiratory capacity and diminishes PGC-1α-induced mitochondrial biogenesis.\",\n      \"method\": \"siRNA knockdown in cultured myotubes, respiratory capacity assays, gene expression analysis; genetic epistasis placing Perm1 downstream of PGC-1α/ERR\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean KD with defined cellular phenotype (respiration) and pathway placement via epistasis, single lab, multiple methods\",\n      \"pmids\": [\"23836911\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"AAV1-mediated overexpression of Perm1 in adult mouse skeletal muscle in vivo increases mitochondrial content and oxidative capacity by 40–80%, increases capillary density, and increases fatigue resistance by ~31–33%, without prominent fiber-type composition changes.\",\n      \"method\": \"AAV1-mediated gene delivery in mice, mitochondrial content quantification, oxidative capacity assays, capillary density measurement, fatigue testing\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo AAV gain-of-function with multiple orthogonal phenotypic readouts, replicates and extends in vitro findings from prior study\",\n      \"pmids\": [\"26481306\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Perm1 physically associates with CaMKII in skeletal muscle and promotes CaMKII activation; knockdown of Perm1 in mouse gastrocnemius via AAV-shRNA blunts exercise-induced CaMKII and p38 MAPK activation, reduces induction of oxidative metabolism regulators after acute exercise, and attenuates mitochondrial biogenesis after four weeks of voluntary training.\",\n      \"method\": \"Immunoprecipitation and mass spectrometry to identify Perm1-associated proteins; validated interaction with CaMKII; AAV-shRNA knockdown in vivo; treadmill exercise and voluntary wheel running with molecular readouts\",\n      \"journal\": \"Molecular metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP/MS identification of binding partner validated independently, plus in vivo KD with multiple defined molecular and physiological phenotypes\",\n      \"pmids\": [\"30862473\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Smyd1 (histone methyltransferase) directly occupies the Perm1 promoter in mouse heart, and Perm1 acts downstream of Smyd1 to regulate cardiac energetics; Perm1 overexpression rescues phenylephrine-induced downregulation of ERRα and its target Ndufv1 (Complex I); Perm1 dose-dependently activates the ERRα promoter and the ERRα target Ndufv1; siRNA knockdown of Perm1 reduces basal respiration and ATP production in cardiomyocytes.\",\n      \"method\": \"ChIP assay (Smyd1 at Perm1 promoter), adenovirus-mediated Perm1 overexpression, siRNA knockdown, Seahorse XF respiration assay, luciferase reporter gene assay\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP establishes direct promoter occupancy, multiple orthogonal methods (reporter assay, Seahorse, KD, OE) in single study\",\n      \"pmids\": [\"32574189\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"ESRRG and PERM1 are induced early during cold-mediated brite/beige adipocyte formation and positively regulate mitochondrial capacity within the PGC-1α transcriptional network; increased expression of PERM1 supports brite/beige adipocyte formation in vitro and in vivo.\",\n      \"method\": \"Transcriptome profiling of inguinal adipocytes during cold exposure, gain-of-function overexpression in vitro and in vivo, mitochondrial capacity assays\",\n      \"journal\": \"Frontiers in endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — gain-of-function with phenotypic readout in vitro and in vivo, but limited mechanistic detail in abstract; single lab\",\n      \"pmids\": [\"32595605\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"PERM1 interacts with the MICOS-MIB complex and with the intracellular adaptor protein ankyrin B (ANKB), which connects the cytoskeleton to the plasma membrane; PERM1 contains a C-terminal transmembrane helix anchoring it to the outer mitochondrial membrane; Perm1 ablation in mice reduces muscle force, decreases mitochondrial membrane potential and Complex I activity, and reduces subsarcolemmal mitochondria (SSM) numbers.\",\n      \"method\": \"Protein interaction study (Co-IP/pulldown), complexome profiling, Perm1 knockout mice, mitochondrial membrane potential measurements, Complex I activity assay, SSM quantification, transmembrane helix identification\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — multiple orthogonal methods (complexome profiling, Co-IP, structural domain identification, KO mouse phenotyping), published in peer-reviewed journal\",\n      \"pmids\": [\"34385433\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"PERM1 associates with the outer mitochondrial membrane and is subject to proteasomal degradation regulated by phosphorylation of its PEST motif by casein kinase 2 (CK2); Perm1 ablation reduces lipin-1 protein expression, causes accumulation of specific phospholipid species, and leads to downregulation of mitochondrial transport proteins for amino acids and carnitines (SLC25A12/13/29/34, CPT2), with altered levels of lipid species, amino acids, and acylcarnitines in Perm1−/− mitochondria.\",\n      \"method\": \"Phosphoproteomics, identification of PEST motif phosphorylation by CK2, Perm1 knockout mice, isolation of Perm1-deficient mitochondria, proteomics, metabolomics, lipid analysis\",\n      \"journal\": \"Journal of molecular and cellular cardiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — phosphoproteomics identifies CK2-mediated PEST motif phosphorylation, KO mice with multiple orthogonal metabolic/proteomic readouts\",\n      \"pmids\": [\"33549681\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Perm1 interacts with PGC-1α in cardiomyocytes and enhances activation of PGC-1 and ERR; Perm1 overexpression increases mitochondrial DNA copy number and oxidative capacity in neonatal mouse cardiomyocytes and reduces damage from hypoxia/reoxygenation stress.\",\n      \"method\": \"Co-immunoprecipitation, mitochondrial DNA copy number quantification, Seahorse oxidative capacity assay, hypoxia/reoxygenation cell death assay in neonatal mouse cardiomyocytes\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP interaction plus multiple functional assays, single lab\",\n      \"pmids\": [\"34029594\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"PERM1 physically interacts with PPARα and PGC-1α; PERM1 localizes to proximal PPAR response elements (PPREs) in endogenous promoters of fatty acid oxidation genes (ChIP assay); PERM1 promotes transcription via PPREs in a PPARα- and PGC-1α-dependent manner; Perm1 knockout mice show downregulation of genes involved in fatty acid and carbohydrate metabolism in the heart.\",\n      \"method\": \"Systemic Perm1 KO mouse generation, RNA-seq and pathway analysis, ChIP assay at PPRE-containing promoters, co-immunoprecipitation (PERM1 with PPARα and PGC-1α), reporter gene assay\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — KO mouse combined with ChIP (direct promoter occupancy), Co-IP (physical interaction), and reporter assay (functional consequence), multiple orthogonal methods\",\n      \"pmids\": [\"36028747\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"PERM1 binds ERRα in cardiomyocytes and the mouse heart; PERM1 localizes to and activates ERR target promoters partly through ERRα; PERM1 functions as a transcriptional coactivator whose activity requires PGC-1α, BAG6, and KANK2 (identified as binding partners by mass spectrometry); Perm1−/− hearts show reduced ejection fraction, reduced phosphocreatine-to-ATP ratio, downregulation of oxidative phosphorylation proteins, and upregulation of glycolysis/polyol pathway.\",\n      \"method\": \"Perm1 KO mice, echocardiography, phosphocreatine-to-ATP ratio (31P-NMR or equivalent), proteomics, metabolomics, co-immunoprecipitation (PERM1-ERRα), mass spectrometry (binding partners: BAG6, KANK2), DNA binding assay, reporter gene assay, mammalian one-hybrid assay\",\n      \"journal\": \"Frontiers in cardiovascular medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — KO mouse with multiple physiological and metabolic readouts combined with Co-IP, MS interactome, and functional reporter assays\",\n      \"pmids\": [\"36419485\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"PERM1 overexpression decreases total O-GlcNAcylated protein levels by decreasing OGT expression (via interaction with transcription repressor E2F1 to suppress Ogt promoter activity) and increasing OGA expression; excessive O-GlcNAcylation caused by loss of PERM1 increases O-GlcNAcylation of PGC-1α and causes dissociation of PGC-1α from PPARα; PERM1 overexpression restores mitochondrial respiration impaired by elevated O-GlcNAcylation.\",\n      \"method\": \"PERM1 overexpression in cardiomyocytes, luciferase reporter assay (Ogt promoter), co-immunoprecipitation (PERM1-E2F1; PGC-1α-PPARα), Oga siRNA knockdown, Seahorse mitochondrial respiration assay, Western blot for O-GlcNAcylation\",\n      \"journal\": \"Journal of molecular and cellular cardiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — multiple orthogonal methods including reporter assay, Co-IP, KD, and functional respiration measurements establishing a defined mechanistic pathway\",\n      \"pmids\": [\"39581161\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"AAV-mediated Perm1 gene delivery in mice enhances cardiac contractility and mitochondrial biogenesis; PERM1 physically interacts with troponin C (TnC) and AAV-Perm1 upregulates TnC protein levels, revealing a role for PERM1 in regulating cardiac contractility.\",\n      \"method\": \"AAV9-mediated Perm1 overexpression in mice, echocardiography, co-immunoprecipitation (PERM1-TnC), Western blot for TnC, mitochondrial DNA copy number\",\n      \"journal\": \"American journal of physiology. Heart and circulatory physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo AAV gain-of-function with Co-IP validation of novel interaction, single lab\",\n      \"pmids\": [\"39269449\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Perm1 activates the Nrf2 antioxidant pathway by promoting cysteine oxidation of Keap1, which reduces Keap1-Nrf2 interaction and inhibits Cul3-mediated ubiquitination/degradation of Nrf2; Cys121 and Cys746 in Perm1 are critical for Keap1 oxidation and cardioprotection against ischemia/reperfusion injury.\",\n      \"method\": \"Perm1 KO and overexpression in mouse myocardium, IR injury model, cysteine oxidation assay of Keap1, Co-immunoprecipitation (Keap1-Nrf2), Cul3-mediated degradation assay, site-directed mutagenesis of Perm1 Cys121 and Cys746, Nrf2 target gene expression\",\n      \"journal\": \"JCI insight\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — mutagenesis identifies critical cysteines, multiple functional assays (Co-IP, degradation, gene expression, IR injury), loss- and gain-of-function\",\n      \"pmids\": [\"42118582\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"PERM1 is a direct downstream target of PRDM16; AAV9-Perm1 treatment of cardiac-specific Prdm16 KO mice improves contractile parameters, reduces LV dilation, and extends survival; Perm1 co-operates with PGC-1α downstream of PRDM16 to regulate fatty acid metabolism; co-immunoprecipitation shows PERM1 interacts with creatine kinase and troponin C.\",\n      \"method\": \"Transcriptomics and proteomics of cardiac-specific Prdm16 KO mice and iPSC-CMs, AAV9-Perm1 neonatal delivery, echocardiography, survival analysis, Co-immunoprecipitation (PERM1-creatine kinase; PERM1-TnC)\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo KO/AAV rescue with multiple phenotypic readouts and Co-IP; preprint, not yet peer-reviewed\",\n      \"pmids\": [\"42039588\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"AAV9-PERM1 in a pressure-overload (TAC) mouse model preserves left ventricular ejection fraction, abrogates cardiac hypertrophy and fibrosis, preserves mitochondrial DNA copy number and TFAM levels, improves mitochondrial respiration, and suppresses TAC-induced O-GlcNAcylation; co-immunoprecipitation confirms PERM1 interactions with creatine kinase and troponin C.\",\n      \"method\": \"AAV9-PERM1 delivery before TAC surgery, echocardiography, mitochondrial DNA quantification, Seahorse mitochondrial respiration, histology (fibrosis/hypertrophy), Western blot (O-GlcNAcylation, TFAM), Co-immunoprecipitation\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — comprehensive in vivo AAV gain-of-function with multiple orthogonal readouts; preprint not yet peer-reviewed\",\n      \"pmids\": [\"41256646\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"In human skeletal muscle, PERM1 protein localizes to the perinuclear region and is enriched in mitochondria (confirmed by immunolabeling, microscopy, and subcellular fractionation); HIIT training increases PERM1 isoform 2 protein and its target CKMT2.\",\n      \"method\": \"Immunolabeling, fluorescence microscopy, subcellular fractionation of human muscle biopsies, Western blotting\",\n      \"journal\": \"Applied physiology, nutrition, and metabolism\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct subcellular fractionation plus imaging establishing mitochondrial/perinuclear localization in human tissue\",\n      \"pmids\": [\"41759080\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"NOR-1 (NR4A3) drives PERM1 expression, and PERM1 in turn mediates NOR-1-dependent upregulation of myoglobin; NOR-1 overexpression in aged muscle increases PERM1, CKMT2, and myoglobin levels and enhances mitochondrial respiration.\",\n      \"method\": \"In vitro NOR-1 knockdown in C2C12 myotubes, NOR-1 overexpression in aged mouse muscle via electroporation/AAV, Western blotting, mitochondrial respiration assay, gene expression analysis\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss- and gain-of-function in vitro and in vivo establishing NOR-1–PERM1–myoglobin axis, single lab\",\n      \"pmids\": [\"40235231\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"PERM1 is a striated muscle-specific outer mitochondrial membrane protein that acts downstream of PGC-1α/ERR (and PRDM16/Smyd1/NOR-1) transcriptional programs to promote mitochondrial biogenesis and oxidative capacity; it physically associates with the MICOS-MIB complex and ankyrin B to anchor subsarcolemmal mitochondria to the sarcolemma, interacts with CaMKII to regulate exercise-induced signaling, binds ERRα/PPARα/PGC-1α to coactivate fatty acid oxidation and energy metabolism genes, suppresses O-GlcNAcylation via E2F1-mediated repression of OGT, activates Nrf2 antioxidant defense through cysteine oxidation of Keap1, and interacts with troponin C and creatine kinase to couple mitochondrial energetics to contractility.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"PERM1 is a striated muscle-enriched regulator of mitochondrial biogenesis and oxidative metabolism that functions downstream of the PGC-1\\u03b1/ERR transcriptional program to set respiratory and contractile capacity in skeletal and cardiac muscle [#0, #1]. It is an outer mitochondrial membrane protein bearing a C-terminal transmembrane helix, localizing to perinuclear and mitochondrial compartments, and its abundance is controlled by CK2-dependent phosphorylation of a PEST motif that targets it for proteasomal degradation [#5, #6, #15]. At the membrane, PERM1 physically associates with the MICOS-MIB complex and the adaptor ankyrin B to support subsarcolemmal mitochondrial number, membrane potential, and Complex I activity, with loss reducing muscle force [#5]. Functionally, PERM1 acts as a transcriptional coactivator: it binds PGC-1\\u03b1, ERR\\u03b1, and PPAR\\u03b1, occupies ERR and PPAR response elements at promoters of oxidative phosphorylation and fatty acid oxidation genes, and requires partners including BAG6 and KANK2 for full coactivator activity [#7, #8, #9]. It is positioned downstream of the muscle transcription factors Smyd1, PRDM16, and NOR-1, linking these programs to energetics, fatty acid metabolism, and myoglobin induction [#3, #13, #16]. PERM1 additionally couples energy state to contractility through interactions with CaMKII, troponin C, and creatine kinase, regulating exercise-induced signaling and contractile protein levels [#2, #11, #13]. It protects the heart by two further mechanisms: suppressing O-GlcNAcylation through E2F1-mediated repression of OGT (preserving PGC-1\\u03b1/PPAR\\u03b1 association) and activating Nrf2 antioxidant defense via cysteine oxidation of Keap1 at PERM1 residues Cys121 and Cys746, conferring resistance to ischemia/reperfusion injury [#10, #12]. Gain-of-function delivery of PERM1 increases mitochondrial content, oxidative capacity, and fatigue resistance and preserves cardiac function under hypoxia, pressure overload, and PRDM16 deficiency [#1, #7, #13, #14].\",\n  \"teleology\": [\n    {\n      \"year\": 2013,\n      \"claim\": \"Established PERM1 as a functional effector within the PGC-1\\u03b1/ERR program rather than just a co-regulated gene, by showing its loss impairs respiration and PGC-1\\u03b1-driven mitochondrial biogenesis.\",\n      \"evidence\": \"siRNA knockdown in myotubes with respiratory assays and genetic epistasis\",\n      \"pmids\": [\"23836911\"],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Molecular activity (coactivator vs structural) undefined\", \"No in vivo confirmation at this stage\", \"No subcellular localization established\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Demonstrated that PERM1 is sufficient in vivo to boost oxidative capacity and physiological performance, validating it as a positive driver of muscle mitochondrial content.\",\n      \"evidence\": \"AAV1 overexpression in adult mouse skeletal muscle with mitochondrial, capillary, and fatigue readouts\",\n      \"pmids\": [\"26481306\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Mechanism of mitochondrial increase not resolved\", \"No protein partners identified\", \"No cardiac data\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identified CaMKII as a PERM1 binding partner and placed PERM1 in exercise-responsive signaling, explaining how it transduces contractile activity into adaptive mitochondrial gene programs.\",\n      \"evidence\": \"Co-IP/MS partner identification plus AAV-shRNA knockdown with exercise paradigms\",\n      \"pmids\": [\"30862473\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Direct vs indirect CaMKII binding not dissected\", \"How PERM1 promotes CaMKII activation mechanistically unclear\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Embedded PERM1 in cardiac and adipocyte transcriptional networks, showing Smyd1 and ESRRG drive PERM1 and that PERM1 feeds back to activate ERR\\u03b1 and its targets to set energetics.\",\n      \"evidence\": \"ChIP, reporter assays, Seahorse, and gain/loss-of-function in cardiomyocytes and beige adipocytes\",\n      \"pmids\": [\"32574189\", \"32595605\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Whether PERM1 binds ERR\\u03b1 directly not yet shown here\", \"Adipocyte mechanism limited in detail\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Defined PERM1 as an outer mitochondrial membrane protein with a transmembrane helix that physically anchors subsarcolemmal mitochondria via MICOS-MIB and ankyrin B, and is turned over by CK2/PEST-dependent proteasomal degradation, establishing both its topology and structural role.\",\n      \"evidence\": \"Complexome profiling, Co-IP, transmembrane helix mapping, phosphoproteomics, and KO mouse phenotyping with metabolomics\",\n      \"pmids\": [\"34385433\", \"33549681\", \"34029594\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Stoichiometry within MICOS-MIB unknown\", \"How a mitochondrial membrane protein also acts in transcription not reconciled\", \"Direct CK2 phosphosite consequences on localization untested\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Resolved PERM1's transcriptional coactivator mechanism by showing it binds PPAR\\u03b1, PGC-1\\u03b1, and ERR\\u03b1, occupies PPRE/ERR promoters, and requires BAG6 and KANK2, with KO hearts losing fatty acid and OXPHOS gene expression and contractile function.\",\n      \"evidence\": \"Perm1 KO mice, ChIP at PPREs, Co-IP, mass spectrometry interactome, reporter and one-hybrid assays\",\n      \"pmids\": [\"36028747\", \"36419485\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"How membrane-anchored PERM1 reaches chromatin unresolved\", \"Roles of BAG6 and KANK2 in coactivation mechanistically undefined\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Uncovered PERM1 control of O-GlcNAcylation and contractility, showing it represses OGT via E2F1 to protect PGC-1\\u03b1/PPAR\\u03b1 association and interacts with troponin C to regulate contractile protein levels.\",\n      \"evidence\": \"Cardiomyocyte overexpression, Ogt reporter assays, Co-IP (E2F1, TnC), and AAV9 in vivo contractility studies; human muscle fractionation/imaging\",\n      \"pmids\": [\"39581161\", \"39269449\", \"41759080\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Whether OGA upregulation is direct or secondary unclear\", \"Functional consequence of TnC binding on calcium sensitivity untested\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Established PERM1 as a redox-active cardioprotective protein and a node downstream of PRDM16 and NOR-1, defining critical cysteines for Keap1 oxidation/Nrf2 activation and extending PERM1's protective effects to ischemia, pressure overload, and PRDM16 loss.\",\n      \"evidence\": \"KO/overexpression with IR and TAC models, site-directed mutagenesis of Cys121/Cys746, Keap1-Nrf2 Co-IP and degradation assays, AAV9 rescue of Prdm16 KO, and NOR-1 loss/gain-of-function\",\n      \"pmids\": [\"42118582\", \"42039588\", \"41256646\", \"40235231\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"TAC and PRDM16 rescue studies are preprints not yet peer-reviewed\", \"How cysteine oxidation of PERM1 is itself triggered unknown\", \"Integration of redox sensing with its membrane/transcriptional roles unresolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved how a single outer mitochondrial membrane protein with a C-terminal transmembrane anchor simultaneously functions as a nuclear transcriptional coactivator, a structural mitochondrial tether, and a Keap1 redox sensor.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"No structural model linking the membrane-anchored and chromatin-associated pools\", \"Mechanism of trafficking between compartments unknown\", \"No human disease link established in the corpus\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [7, 8, 9]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [2, 10, 12]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [5]},\n      {\"term_id\": \"GO:0140299\", \"supporting_discovery_ids\": [12]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [5, 6, 15]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [8, 9, 10]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [0, 8, 9]},\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [1, 5, 7]},\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [12]},\n      {\"term_id\": \"R-HSA-397014\", \"supporting_discovery_ids\": [11, 13]}\n    ],\n    \"complexes\": [\n      \"MICOS-MIB complex\"\n    ],\n    \"partners\": [\n      \"PPARGC1A\",\n      \"ESRRA\",\n      \"PPARA\",\n      \"CAMK2\",\n      \"ANK2\",\n      \"KEAP1\",\n      \"E2F1\",\n      \"TNNC1\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}