{"gene":"MTLN","run_date":"2026-06-10T02:59:51","timeline":{"discoveries":[{"year":2018,"finding":"MOXI (MTLN) is a conserved muscle-enriched micropeptide that localizes to the inner mitochondrial membrane and associates with the mitochondrial trifunctional protein (MTP) complex; knockout mice show diminished fatty acid β-oxidation in isolated heart and skeletal muscle mitochondria, while transgenic overexpression enhances β-oxidation, and knockout mice preferentially oxidize carbohydrates over fatty acids.","method":"Subcellular fractionation/localization, Co-immunoprecipitation with MTP complex, isolated mitochondria fatty acid oxidation assays, transgenic overexpression and knockout mouse models, isolated perfused heart metabolic assay, exercise capacity testing","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP with MTP complex, in vitro mitochondrial assays, both KO and transgenic OE mouse models with orthogonal metabolic readouts in single rigorous study","pmids":["29949755"],"is_preprint":false},{"year":2019,"finding":"MPM (MTLN) micropeptide localizes to mitochondria and is required for myogenic differentiation; MPM silencing inhibits C2C12 myoblast differentiation into myotubes, MPM overexpression stimulates it, and MPM KO mice show smaller skeletal muscle fibers and impaired muscle regeneration; mechanistically, MPM increases mitochondrial oxygen consumption and ATP production, and ectopic PGC-1α expression rescues the inhibitory effect of MPM silencing on myogenic differentiation.","method":"siRNA knockdown, overexpression in C2C12 cells, MPM KO mouse model, mitochondrial respiration assay (oxygen consumption, ATP production), PGC-1α epistasis rescue experiment, immunofluorescence localization","journal":"Cell death & disease","confidence":"High","confidence_rationale":"Tier 2 / Strong — KO mouse with defined phenotype, gain- and loss-of-function, epistasis rescue with PGC-1α, multiple orthogonal metabolic readouts","pmids":["31296841"],"is_preprint":false},{"year":2020,"finding":"LEMP (MTLN) is a 56-aa micropeptide that localizes to both the plasma membrane and mitochondria, associates with multiple mitochondrial proteins, and promotes skeletal muscle formation; LEMP knockdown impairs zebrafish muscle development, which is rescued by mouse LEMP expression, demonstrating evolutionarily conserved function in myogenesis.","method":"Subcellular localization by fluorescence imaging, Co-immunoprecipitation with mitochondrial proteins, zebrafish loss-of-function (morpholino/genetic), cross-species rescue experiment with mouse LEMP, satellite cell RNA-seq","journal":"Cell death & disease","confidence":"High","confidence_rationale":"Tier 2 / Strong — cross-species rescue, Co-IP with mitochondrial partners, loss-of-function with specific developmental phenotype, multiple orthogonal methods","pmids":["32393776"],"is_preprint":false},{"year":2021,"finding":"MPM (MTLN) interacts with NDUFA7 and inhibits mitochondrial complex I activity; MPM overexpression reduces complex I activity and lowers the NAD+/NADH ratio, while MPM silencing increases complex I activity and elevates NAD+/NADH; NDUFA7 knockdown attenuates the effect of MPM silencing on complex I. The NAD+ precursor nicotinamide abrogates MPM's inhibitory effect on hepatoma cell migration. Additionally, miR-17-5p binds to MPM mRNA and inhibits MPM expression.","method":"Co-immunoprecipitation (MPM–NDUFA7), mitochondrial complex I activity assay, NAD+/NADH measurement, siRNA knockdown (MPM, NDUFA7), nicotinamide rescue experiment, luciferase/binding assay for miR-17-5p, in vitro migration/invasion assays, in vivo metastasis models","journal":"Molecular therapy : the journal of the American Society of Gene Therapy","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP identifies binding partner, epistasis knockdown of NDUFA7 confirms pathway, metabolic rescue with NAD+ precursor, multiple orthogonal methods in single study","pmids":["34478872"],"is_preprint":false},{"year":2022,"finding":"Mitoregulin (Mtln/MTLN) knockout mice develop obesity on a high-fat diet with increased fat accumulation, elevated serum triglycerides and other oxidation substrates, and exhaustion of TCA cycle intermediates, indicating that Mtln is required for efficient oxidative metabolism of respiratory substrates in mitochondria.","method":"Mtln KO mouse model, magnetic resonance live imaging (fat mass), serum metabolite measurement (triglycerides, TCA intermediates), high-fat diet challenge","journal":"Biochimie","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO mouse with defined metabolic phenotype and multiple metabolite readouts, single lab, no in vitro mechanistic reconstitution","pmids":["36174793"],"is_preprint":false},{"year":2023,"finding":"MOXI (MTLN) translocates from mitochondria/cytoplasm to the nucleus upon TGF-β1 stimulation; in the nucleus, MOXI forms a complex with N-acetyltransferase 14 (Nat14) and transcription factor c-Jun, enhancing collagen I gene promoter activity. Phosphorylation at T49 is required for MOXI nuclear localization and complex formation. MOXI deletion protects mice against kidney fibrosis, and antisense oligonucleotide knockdown also protects against fibrosis.","method":"Bimolecular fluorescence complementation (BiFC) identifying Nat14 and c-Jun as binding partners, subcellular fractionation and live imaging for nuclear translocation, luciferase promoter activity assay (collagen I), site-directed mutagenesis (T49A point mutation), KO mouse models (folic acid and UUO fibrosis), antisense oligonucleotide treatment","journal":"Kidney international","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — mutagenesis (T49A) defines phosphorylation requirement, BiFC identifies binding partners, promoter assay confirms transcriptional mechanism, KO and point-mutant knock-in mice with identical phenotype, multiple orthogonal methods","pmids":["36804379"],"is_preprint":false},{"year":2024,"finding":"MPM (MTLN) promotes cardiomyocyte proliferation and heart growth by interacting with PTPMT1 to activate the AKT pathway; MPM KO mice show reduced left ventricular mass and myocardial thickness, MPM silencing downregulates cell cycle-promoting genes and reduces cardiomyocyte proliferation, and PTPMT1 silencing attenuates MPM-induced AKT activation; AKT pathway inhibition abrogates MPM-promoted cardiomyocyte proliferation.","method":"Co-immunoprecipitation (MPM–PTPMT1), MPM KO mouse model, RNA-seq in H9c2 cells, gain- and loss-of-function (siRNA/overexpression), AKT pathway inhibition rescue experiment, proliferation assays, cardiac phenotyping","journal":"Biochimica et biophysica acta. Molecular cell research","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP identifies PTPMT1 as binding partner, epistasis (PTPMT1 KD and AKT inhibition rescue) defines pathway, KO mouse cardiac phenotype, multiple orthogonal methods","pmids":["39163918"],"is_preprint":false},{"year":2024,"finding":"Mitoregulin (Mtln/MTLN) self-associates to form likely hexameric pore-like structures in the mitochondrial membrane; endogenous Mtln co-immunoprecipitates with epitope-tagged Mtln at high efficiency, Mtln primarily exists in a ~66 kDa complex, protein modeling suggests a hexameric arrangement, and synthetic Mtln protein forms oligomeric complexes in vitro.","method":"Co-immunoprecipitation (endogenous–epitope-tagged), native PAGE gel assessment of complexes in cells and tissues, protein structure modeling/simulation, in vitro oligomerization of synthetic Mtln","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus in vitro oligomerization and native gel, preprint not peer-reviewed, structural model not experimentally validated at atomic resolution","pmids":["bio_10.1101_2024.07.10.601956"],"is_preprint":true}],"current_model":"MTLN (MOXI/Mitoregulin/LEMP/MPM) encodes a conserved ~56-amino acid mitochondrial inner membrane micropeptide that enhances fatty acid β-oxidation by associating with the mitochondrial trifunctional protein complex, inhibits mitochondrial complex I activity by binding NDUFA7 to regulate NAD+/NADH balance, boosts mitochondrial respiratory efficiency and promotes myogenic differentiation and cardiomyocyte proliferation (the latter via a PTPMT1–AKT axis), and can translocate to the nucleus upon TGF-β1 stimulation where it bridges N-acetyltransferase 14 and c-Jun to drive fibrotic gene transcription; the protein also self-associates into likely hexameric pore-like structures in the mitochondrial membrane."},"narrative":{"mechanistic_narrative":"MTLN (MOXI/Mitoregulin/MPM/LEMP) encodes a conserved ~56-amino acid micropeptide of the inner mitochondrial membrane that functions as a regulator of oxidative metabolism and respiratory efficiency [PMID:29949755, PMID:32393776]. It enhances mitochondrial fatty acid β-oxidation through association with the mitochondrial trifunctional protein complex, such that loss of MTLN shifts fuel preference from fatty acids to carbohydrates and, under high-fat-diet challenge, produces obesity, elevated serum triglycerides, and depletion of TCA cycle intermediates [PMID:29949755, PMID:36174793]. MTLN also constrains respiratory chain output by binding the complex I subunit NDUFA7 to inhibit complex I activity and lower the NAD+/NADH ratio [PMID:34478872]. Through these effects on mitochondrial respiration it promotes myogenic differentiation — an activity rescued downstream by PGC-1α — and is required for normal skeletal muscle fiber size, regeneration, and development across species [PMID:31296841, PMID:32393776]. In the heart, MTLN drives cardiomyocyte proliferation and growth by interacting with PTPMT1 to activate AKT signaling [PMID:39163918]. Beyond mitochondria, MTLN undergoes T49-phosphorylation-dependent nuclear translocation upon TGF-β1 stimulation, where it bridges N-acetyltransferase 14 (Nat14) and c-Jun to activate the collagen I promoter and promote kidney fibrosis [PMID:36804379]. The micropeptide self-associates into pore-like oligomeric complexes in the mitochondrial membrane [PMID:bio_10.1101_2024.07.10.601956].","teleology":[{"year":2018,"claim":"Established that MTLN is a functional mitochondrial micropeptide rather than noncoding sequence, defining its core role in fatty acid β-oxidation via the trifunctional protein complex.","evidence":"Subcellular fractionation, reciprocal Co-IP with MTP, isolated-mitochondria oxidation assays, and KO/transgenic mouse metabolic phenotyping","pmids":["29949755"],"confidence":"High","gaps":["Whether MTLN acts catalytically or as a structural/regulatory scaffold for MTP was not resolved","Direct binding stoichiometry to MTP subunits not defined"]},{"year":2019,"claim":"Linked MTLN's mitochondrial respiratory function to a developmental output by showing it is required for myogenic differentiation, placing it upstream of PGC-1α-driven biogenesis.","evidence":"siRNA/overexpression in C2C12, KO mouse muscle phenotyping, respiration/ATP assays, and PGC-1α epistasis rescue","pmids":["31296841"],"confidence":"High","gaps":["Molecular link between MTLN and PGC-1α not defined","Whether differentiation defect is purely metabolic or signaling-dependent unclear"]},{"year":2020,"claim":"Demonstrated evolutionary conservation of MTLN's myogenic function via cross-species rescue, confirming a generalizable role in muscle formation.","evidence":"Zebrafish loss-of-function rescued by mouse LEMP, Co-IP with mitochondrial proteins, satellite-cell RNA-seq","pmids":["32393776"],"confidence":"High","gaps":["Reported plasma membrane localization not mechanistically explained","Identities/relevance of additional mitochondrial partners not resolved"]},{"year":2021,"claim":"Identified a direct respiratory-chain target, showing MTLN binds NDUFA7 to inhibit complex I and tune the NAD+/NADH ratio, connecting it to redox balance and tumor cell behavior.","evidence":"MPM–NDUFA7 Co-IP, complex I activity and NAD+/NADH assays, NDUFA7 knockdown epistasis, NAD+ precursor rescue, migration/metastasis models, miR-17-5p binding assay","pmids":["34478872"],"confidence":"High","gaps":["How MTLN reconciles complex I inhibition with enhanced β-oxidation/respiration is unresolved","Structural basis of NDUFA7 binding unknown"]},{"year":2022,"claim":"Confirmed the whole-organism metabolic consequence of MTLN loss, establishing it as required for efficient oxidative metabolism of respiratory substrates in vivo.","evidence":"Mtln KO mice on high-fat diet with MRI fat-mass imaging and serum metabolite/TCA-intermediate measurement","pmids":["36174793"],"confidence":"Medium","gaps":["No in vitro mechanistic reconstitution","Single-lab phenotype without orthogonal molecular mechanism"]},{"year":2023,"claim":"Revealed an unexpected non-mitochondrial, transcriptional function: TGF-β1-induced, T49-phosphorylation-dependent nuclear MTLN bridges Nat14 and c-Jun to drive fibrotic gene expression.","evidence":"BiFC partner identification, fractionation/live imaging of translocation, collagen I promoter luciferase, T49A mutagenesis, KO and ASO fibrosis mouse models","pmids":["36804379"],"confidence":"High","gaps":["Kinase responsible for T49 phosphorylation not identified","How a mitochondrial micropeptide is retargeted to the nucleus mechanistically unclear"]},{"year":2024,"claim":"Extended MTLN's signaling role to cardiac growth, defining a PTPMT1–AKT axis that drives cardiomyocyte proliferation.","evidence":"MPM–PTPMT1 Co-IP, KO mouse cardiac phenotyping, RNA-seq, PTPMT1 knockdown and AKT inhibition epistasis rescues","pmids":["39163918"],"confidence":"High","gaps":["How mitochondrial MTLN engages PTPMT1 to activate cytoplasmic AKT is undefined","Relationship to MTLN's metabolic functions in cardiomyocytes unclear"]},{"year":2024,"claim":"Proposed a structural basis for MTLN function, showing it self-associates into likely hexameric pore-like complexes in the mitochondrial membrane.","evidence":"Endogenous–tagged Co-IP, native PAGE (~66 kDa complex), structure modeling, in vitro oligomerization of synthetic protein (preprint)","pmids":["bio_10.1101_2024.07.10.601956"],"confidence":"Medium","gaps":["Hexameric model not validated at atomic resolution","Functional consequence of pore formation (e.g. transport, partner scaffolding) not demonstrated","Preprint, not peer-reviewed"]},{"year":null,"claim":"It remains unresolved how a single ~56-aa micropeptide integrates seemingly opposing mitochondrial activities (β-oxidation enhancement vs complex I inhibition) and switches to a distinct nuclear transcriptional role, and whether its oligomeric pore structure underlies these functions.","evidence":"","pmids":[],"confidence":"Medium","gaps":["Unifying biochemical mechanism linking metabolic, signaling, and transcriptional roles not established","No high-resolution structure of MTLN in any partner complex"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[3]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,3]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[5]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[7]}],"localization":[{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[0,1,2]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[5]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[2]}],"pathway":[{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[0,3,4]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[1,2,6]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[5]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[6]}],"complexes":["mitochondrial trifunctional protein complex","MTLN homo-oligomer (likely hexameric pore)"],"partners":["HADHA/HADHB (MTP COMPLEX)","NDUFA7","PTPMT1","NAT14","JUN"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q8NCU8","full_name":"Mitoregulin","aliases":["Micropeptide in mitochondria","Micropeptide regulator of beta-oxidation","Small integral membrane protein 37","lncRNA-encoded micropeptide"],"length_aa":56,"mass_kda":6.5,"function":"Positively regulates mitochondrial complex assembly and/or stability (By similarity). Increases mitochondrial membrane potential while decreasing mitochondrial reactive oxygen species (PubMed:29949756). Increases mitochondrial respiration rate (PubMed:29949756). Increased mitochondrial respiratory activity promotes myogenic differentiation which facilitates muscle growth and regeneration (By similarity). Increases mitochondrial calcium retention capacity (PubMed:29949756). Plays a role in maintenance of cellular lipid composition through its interaction with cytochrome b5 reductase CYB5R3 which is required for mitochondrial respiratory complex I activity (By similarity). Interacts with the mitochondrial trifunctional enzyme complex (MTE) and enhances fatty acid beta-oxidation (PubMed:32243843). Not required for MTE formation or stability (By similarity). Modulates triglyceride clearance in adipocytes through its role in regulating fatty acid beta-oxidation and lipolysis (PubMed:32243843)","subcellular_location":"Mitochondrion inner membrane","url":"https://www.uniprot.org/uniprotkb/Q8NCU8/entry"},"depmap":{"release":"DepMap","has_data":false,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/MTLN"},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/MTLN","total_profiled":1310},"omim":[{"mim_id":"620770","title":"MITOREGULIN; MTLN","url":"https://www.omim.org/entry/620770"},{"mim_id":"300792","title":"MICRO RNA 106A; MIR106A","url":"https://www.omim.org/entry/300792"},{"mim_id":"191170","title":"TUMOR PROTEIN p53; TP53","url":"https://www.omim.org/entry/191170"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Group enriched","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"heart muscle","ntpm":232.8},{"tissue":"skeletal muscle","ntpm":736.2},{"tissue":"tongue","ntpm":262.1}],"url":"https://www.proteinatlas.org/search/MTLN"},"hgnc":{"alias_symbol":["MOXI","LEMP","MPM","TILR"],"prev_symbol":["NCRNA00116","LINC00116","SMIM37"]},"alphafold":{"accession":"Q8NCU8","domains":[],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8NCU8","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q8NCU8-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q8NCU8-F1-predicted_aligned_error_v6.png","plddt_mean":89.88},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=MTLN","jax_strain_url":"https://www.jax.org/strain/search?query=MTLN"},"sequence":{"accession":"Q8NCU8","fasta_url":"https://rest.uniprot.org/uniprotkb/Q8NCU8.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q8NCU8/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8NCU8"}},"corpus_meta":[{"pmid":"7690961","id":"PMC_7690961","title":"DNA topoisomerase II alpha is the major chromosome protein 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Molecular cell research","url":"https://pubmed.ncbi.nlm.nih.gov/39163918","citation_count":1,"is_preprint":false},{"pmid":"41121175","id":"PMC_41121175","title":"FL496, an FL118-derived small molecule, induces growth inhibition, senescence, and apoptosis of malignant pleural mesothelioma (MPM) cells, and exhibits anti-MPM tumor efficacy strikingly superior to the pemetrexed-cisplatin combination.","date":"2025","source":"Journal of experimental & clinical cancer research : CR","url":"https://pubmed.ncbi.nlm.nih.gov/41121175","citation_count":1,"is_preprint":false},{"pmid":"37345150","id":"PMC_37345150","title":"Genomic and Transcriptomic Analyses of Malignant Pleural Mesothelioma (MPM) Samples Reveal Crucial Insights for Preclinical Testing.","date":"2023","source":"Cancers","url":"https://pubmed.ncbi.nlm.nih.gov/37345150","citation_count":1,"is_preprint":false},{"pmid":"37203120","id":"PMC_37203120","title":"Two rare copy number variants involving loss of NPHP1, MALL, and MTLN genes contribute to nephronophthisis-induced nephropathy progression in a family: A case report.","date":"2023","source":"Nigerian journal of clinical practice","url":"https://pubmed.ncbi.nlm.nih.gov/37203120","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2024.07.10.601956","title":"Mitoregulin self-associates to form likely homo-oligomeric pore-like structures","date":"2024-07-11","source":"bioRxiv","url":"https://doi.org/10.1101/2024.07.10.601956","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.08.25.25333696","title":"EXercise TheRApy in Mesothelioma feasibility study (EXTRA-Meso Feasibility) – Protocol of a randomised feasibility study","date":"2025-08-28","source":"bioRxiv","url":"https://doi.org/10.1101/2025.08.25.25333696","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.07.25.25332211","title":"Performance Analysis of Speech Recognition Models in Automated Scoring of the QuickSIN Test","date":"2025-07-25","source":"bioRxiv","url":"https://doi.org/10.1101/2025.07.25.25332211","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":45151,"output_tokens":2614,"usd":0.087332,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":10022,"output_tokens":3418,"usd":0.06778,"stage2_stop_reason":"end_turn"},"total_usd":0.155112,"stage1_batch_id":"msgbatch_01BbTCMyrRPyhtEq6b1MdwCN","stage2_batch_id":"msgbatch_011dEed5bbxYvTAaQWKJevxu","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2018,\n      \"finding\": \"MOXI (MTLN) is a conserved muscle-enriched micropeptide that localizes to the inner mitochondrial membrane and associates with the mitochondrial trifunctional protein (MTP) complex; knockout mice show diminished fatty acid β-oxidation in isolated heart and skeletal muscle mitochondria, while transgenic overexpression enhances β-oxidation, and knockout mice preferentially oxidize carbohydrates over fatty acids.\",\n      \"method\": \"Subcellular fractionation/localization, Co-immunoprecipitation with MTP complex, isolated mitochondria fatty acid oxidation assays, transgenic overexpression and knockout mouse models, isolated perfused heart metabolic assay, exercise capacity testing\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP with MTP complex, in vitro mitochondrial assays, both KO and transgenic OE mouse models with orthogonal metabolic readouts in single rigorous study\",\n      \"pmids\": [\"29949755\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"MPM (MTLN) micropeptide localizes to mitochondria and is required for myogenic differentiation; MPM silencing inhibits C2C12 myoblast differentiation into myotubes, MPM overexpression stimulates it, and MPM KO mice show smaller skeletal muscle fibers and impaired muscle regeneration; mechanistically, MPM increases mitochondrial oxygen consumption and ATP production, and ectopic PGC-1α expression rescues the inhibitory effect of MPM silencing on myogenic differentiation.\",\n      \"method\": \"siRNA knockdown, overexpression in C2C12 cells, MPM KO mouse model, mitochondrial respiration assay (oxygen consumption, ATP production), PGC-1α epistasis rescue experiment, immunofluorescence localization\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — KO mouse with defined phenotype, gain- and loss-of-function, epistasis rescue with PGC-1α, multiple orthogonal metabolic readouts\",\n      \"pmids\": [\"31296841\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"LEMP (MTLN) is a 56-aa micropeptide that localizes to both the plasma membrane and mitochondria, associates with multiple mitochondrial proteins, and promotes skeletal muscle formation; LEMP knockdown impairs zebrafish muscle development, which is rescued by mouse LEMP expression, demonstrating evolutionarily conserved function in myogenesis.\",\n      \"method\": \"Subcellular localization by fluorescence imaging, Co-immunoprecipitation with mitochondrial proteins, zebrafish loss-of-function (morpholino/genetic), cross-species rescue experiment with mouse LEMP, satellite cell RNA-seq\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — cross-species rescue, Co-IP with mitochondrial partners, loss-of-function with specific developmental phenotype, multiple orthogonal methods\",\n      \"pmids\": [\"32393776\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"MPM (MTLN) interacts with NDUFA7 and inhibits mitochondrial complex I activity; MPM overexpression reduces complex I activity and lowers the NAD+/NADH ratio, while MPM silencing increases complex I activity and elevates NAD+/NADH; NDUFA7 knockdown attenuates the effect of MPM silencing on complex I. The NAD+ precursor nicotinamide abrogates MPM's inhibitory effect on hepatoma cell migration. Additionally, miR-17-5p binds to MPM mRNA and inhibits MPM expression.\",\n      \"method\": \"Co-immunoprecipitation (MPM–NDUFA7), mitochondrial complex I activity assay, NAD+/NADH measurement, siRNA knockdown (MPM, NDUFA7), nicotinamide rescue experiment, luciferase/binding assay for miR-17-5p, in vitro migration/invasion assays, in vivo metastasis models\",\n      \"journal\": \"Molecular therapy : the journal of the American Society of Gene Therapy\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP identifies binding partner, epistasis knockdown of NDUFA7 confirms pathway, metabolic rescue with NAD+ precursor, multiple orthogonal methods in single study\",\n      \"pmids\": [\"34478872\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Mitoregulin (Mtln/MTLN) knockout mice develop obesity on a high-fat diet with increased fat accumulation, elevated serum triglycerides and other oxidation substrates, and exhaustion of TCA cycle intermediates, indicating that Mtln is required for efficient oxidative metabolism of respiratory substrates in mitochondria.\",\n      \"method\": \"Mtln KO mouse model, magnetic resonance live imaging (fat mass), serum metabolite measurement (triglycerides, TCA intermediates), high-fat diet challenge\",\n      \"journal\": \"Biochimie\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO mouse with defined metabolic phenotype and multiple metabolite readouts, single lab, no in vitro mechanistic reconstitution\",\n      \"pmids\": [\"36174793\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"MOXI (MTLN) translocates from mitochondria/cytoplasm to the nucleus upon TGF-β1 stimulation; in the nucleus, MOXI forms a complex with N-acetyltransferase 14 (Nat14) and transcription factor c-Jun, enhancing collagen I gene promoter activity. Phosphorylation at T49 is required for MOXI nuclear localization and complex formation. MOXI deletion protects mice against kidney fibrosis, and antisense oligonucleotide knockdown also protects against fibrosis.\",\n      \"method\": \"Bimolecular fluorescence complementation (BiFC) identifying Nat14 and c-Jun as binding partners, subcellular fractionation and live imaging for nuclear translocation, luciferase promoter activity assay (collagen I), site-directed mutagenesis (T49A point mutation), KO mouse models (folic acid and UUO fibrosis), antisense oligonucleotide treatment\",\n      \"journal\": \"Kidney international\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — mutagenesis (T49A) defines phosphorylation requirement, BiFC identifies binding partners, promoter assay confirms transcriptional mechanism, KO and point-mutant knock-in mice with identical phenotype, multiple orthogonal methods\",\n      \"pmids\": [\"36804379\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"MPM (MTLN) promotes cardiomyocyte proliferation and heart growth by interacting with PTPMT1 to activate the AKT pathway; MPM KO mice show reduced left ventricular mass and myocardial thickness, MPM silencing downregulates cell cycle-promoting genes and reduces cardiomyocyte proliferation, and PTPMT1 silencing attenuates MPM-induced AKT activation; AKT pathway inhibition abrogates MPM-promoted cardiomyocyte proliferation.\",\n      \"method\": \"Co-immunoprecipitation (MPM–PTPMT1), MPM KO mouse model, RNA-seq in H9c2 cells, gain- and loss-of-function (siRNA/overexpression), AKT pathway inhibition rescue experiment, proliferation assays, cardiac phenotyping\",\n      \"journal\": \"Biochimica et biophysica acta. Molecular cell research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP identifies PTPMT1 as binding partner, epistasis (PTPMT1 KD and AKT inhibition rescue) defines pathway, KO mouse cardiac phenotype, multiple orthogonal methods\",\n      \"pmids\": [\"39163918\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Mitoregulin (Mtln/MTLN) self-associates to form likely hexameric pore-like structures in the mitochondrial membrane; endogenous Mtln co-immunoprecipitates with epitope-tagged Mtln at high efficiency, Mtln primarily exists in a ~66 kDa complex, protein modeling suggests a hexameric arrangement, and synthetic Mtln protein forms oligomeric complexes in vitro.\",\n      \"method\": \"Co-immunoprecipitation (endogenous–epitope-tagged), native PAGE gel assessment of complexes in cells and tissues, protein structure modeling/simulation, in vitro oligomerization of synthetic Mtln\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus in vitro oligomerization and native gel, preprint not peer-reviewed, structural model not experimentally validated at atomic resolution\",\n      \"pmids\": [\"bio_10.1101_2024.07.10.601956\"],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"MTLN (MOXI/Mitoregulin/LEMP/MPM) encodes a conserved ~56-amino acid mitochondrial inner membrane micropeptide that enhances fatty acid β-oxidation by associating with the mitochondrial trifunctional protein complex, inhibits mitochondrial complex I activity by binding NDUFA7 to regulate NAD+/NADH balance, boosts mitochondrial respiratory efficiency and promotes myogenic differentiation and cardiomyocyte proliferation (the latter via a PTPMT1–AKT axis), and can translocate to the nucleus upon TGF-β1 stimulation where it bridges N-acetyltransferase 14 and c-Jun to drive fibrotic gene transcription; the protein also self-associates into likely hexameric pore-like structures in the mitochondrial membrane.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"MTLN (MOXI/Mitoregulin/MPM/LEMP) encodes a conserved ~56-amino acid micropeptide of the inner mitochondrial membrane that functions as a regulator of oxidative metabolism and respiratory efficiency [#0, #2]. It enhances mitochondrial fatty acid \\u03b2-oxidation through association with the mitochondrial trifunctional protein complex, such that loss of MTLN shifts fuel preference from fatty acids to carbohydrates and, under high-fat-diet challenge, produces obesity, elevated serum triglycerides, and depletion of TCA cycle intermediates [#0, #4]. MTLN also constrains respiratory chain output by binding the complex I subunit NDUFA7 to inhibit complex I activity and lower the NAD+/NADH ratio [#3]. Through these effects on mitochondrial respiration it promotes myogenic differentiation \\u2014 an activity rescued downstream by PGC-1\\u03b1 \\u2014 and is required for normal skeletal muscle fiber size, regeneration, and development across species [#1, #2]. In the heart, MTLN drives cardiomyocyte proliferation and growth by interacting with PTPMT1 to activate AKT signaling [#6]. Beyond mitochondria, MTLN undergoes T49-phosphorylation-dependent nuclear translocation upon TGF-\\u03b21 stimulation, where it bridges N-acetyltransferase 14 (Nat14) and c-Jun to activate the collagen I promoter and promote kidney fibrosis [#5]. The micropeptide self-associates into pore-like oligomeric complexes in the mitochondrial membrane [#7].\",\n  \"teleology\": [\n    {\n      \"year\": 2018,\n      \"claim\": \"Established that MTLN is a functional mitochondrial micropeptide rather than noncoding sequence, defining its core role in fatty acid \\u03b2-oxidation via the trifunctional protein complex.\",\n      \"evidence\": \"Subcellular fractionation, reciprocal Co-IP with MTP, isolated-mitochondria oxidation assays, and KO/transgenic mouse metabolic phenotyping\",\n      \"pmids\": [\"29949755\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether MTLN acts catalytically or as a structural/regulatory scaffold for MTP was not resolved\", \"Direct binding stoichiometry to MTP subunits not defined\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Linked MTLN's mitochondrial respiratory function to a developmental output by showing it is required for myogenic differentiation, placing it upstream of PGC-1\\u03b1-driven biogenesis.\",\n      \"evidence\": \"siRNA/overexpression in C2C12, KO mouse muscle phenotyping, respiration/ATP assays, and PGC-1\\u03b1 epistasis rescue\",\n      \"pmids\": [\"31296841\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular link between MTLN and PGC-1\\u03b1 not defined\", \"Whether differentiation defect is purely metabolic or signaling-dependent unclear\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Demonstrated evolutionary conservation of MTLN's myogenic function via cross-species rescue, confirming a generalizable role in muscle formation.\",\n      \"evidence\": \"Zebrafish loss-of-function rescued by mouse LEMP, Co-IP with mitochondrial proteins, satellite-cell RNA-seq\",\n      \"pmids\": [\"32393776\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Reported plasma membrane localization not mechanistically explained\", \"Identities/relevance of additional mitochondrial partners not resolved\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Identified a direct respiratory-chain target, showing MTLN binds NDUFA7 to inhibit complex I and tune the NAD+/NADH ratio, connecting it to redox balance and tumor cell behavior.\",\n      \"evidence\": \"MPM\\u2013NDUFA7 Co-IP, complex I activity and NAD+/NADH assays, NDUFA7 knockdown epistasis, NAD+ precursor rescue, migration/metastasis models, miR-17-5p binding assay\",\n      \"pmids\": [\"34478872\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How MTLN reconciles complex I inhibition with enhanced \\u03b2-oxidation/respiration is unresolved\", \"Structural basis of NDUFA7 binding unknown\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Confirmed the whole-organism metabolic consequence of MTLN loss, establishing it as required for efficient oxidative metabolism of respiratory substrates in vivo.\",\n      \"evidence\": \"Mtln KO mice on high-fat diet with MRI fat-mass imaging and serum metabolite/TCA-intermediate measurement\",\n      \"pmids\": [\"36174793\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No in vitro mechanistic reconstitution\", \"Single-lab phenotype without orthogonal molecular mechanism\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Revealed an unexpected non-mitochondrial, transcriptional function: TGF-\\u03b21-induced, T49-phosphorylation-dependent nuclear MTLN bridges Nat14 and c-Jun to drive fibrotic gene expression.\",\n      \"evidence\": \"BiFC partner identification, fractionation/live imaging of translocation, collagen I promoter luciferase, T49A mutagenesis, KO and ASO fibrosis mouse models\",\n      \"pmids\": [\"36804379\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Kinase responsible for T49 phosphorylation not identified\", \"How a mitochondrial micropeptide is retargeted to the nucleus mechanistically unclear\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Extended MTLN's signaling role to cardiac growth, defining a PTPMT1\\u2013AKT axis that drives cardiomyocyte proliferation.\",\n      \"evidence\": \"MPM\\u2013PTPMT1 Co-IP, KO mouse cardiac phenotyping, RNA-seq, PTPMT1 knockdown and AKT inhibition epistasis rescues\",\n      \"pmids\": [\"39163918\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How mitochondrial MTLN engages PTPMT1 to activate cytoplasmic AKT is undefined\", \"Relationship to MTLN's metabolic functions in cardiomyocytes unclear\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Proposed a structural basis for MTLN function, showing it self-associates into likely hexameric pore-like complexes in the mitochondrial membrane.\",\n      \"evidence\": \"Endogenous\\u2013tagged Co-IP, native PAGE (~66 kDa complex), structure modeling, in vitro oligomerization of synthetic protein (preprint)\",\n      \"pmids\": [\"bio_10.1101_2024.07.10.601956\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Hexameric model not validated at atomic resolution\", \"Functional consequence of pore formation (e.g. transport, partner scaffolding) not demonstrated\", \"Preprint, not peer-reviewed\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved how a single ~56-aa micropeptide integrates seemingly opposing mitochondrial activities (\\u03b2-oxidation enhancement vs complex I inhibition) and switches to a distinct nuclear transcriptional role, and whether its oligomeric pore structure underlies these functions.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Unifying biochemical mechanism linking metabolic, signaling, and transcriptional roles not established\", \"No high-resolution structure of MTLN in any partner complex\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [3]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 3]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [5]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [7]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005743\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [0, 1, 2]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [5]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [2]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [0, 3, 4]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [1, 2, 6]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [5]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [6]}\n    ],\n    \"complexes\": [\n      \"mitochondrial trifunctional protein complex\",\n      \"MTLN homo-oligomer (likely hexameric pore)\"\n    ],\n    \"partners\": [\n      \"HADHA/HADHB (MTP complex)\",\n      \"NDUFA7\",\n      \"PTPMT1\",\n      \"NAT14\",\n      \"JUN\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}