{"gene":"MIEF1","run_date":"2026-06-10T02:59:50","timeline":{"discoveries":[{"year":2011,"finding":"MIEF1 (MiD51) is anchored to the outer mitochondrial membrane and directly recruits Drp1 to the mitochondrial surface; knockdown of MIEF1 reduces Drp1 association with mitochondria, leading to unopposed fusion and mitochondrial elongation.","method":"Immunofluorescence, co-immunoprecipitation, knockdown/overexpression in mammalian cells","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, loss-of-function knockdown with defined morphological phenotype, independently replicated across multiple labs (PMID:21701560 and PMID:21508961)","pmids":["21701560","21508961"],"is_preprint":false},{"year":2011,"finding":"MIEF1 recruits Drp1 independently of hFis1, Mff, and Mfn2, but inhibits Drp1 fission activity, thereby promoting mitochondrial fusion rather than fission when overexpressed. MIEF1 also interacts with hFis1, and elevated hFis1 partially reverses MIEF1-induced fusion.","method":"Co-immunoprecipitation, overexpression and knockdown with mitochondrial morphology readout, interaction mapping with Mff/hFis1/Mfn2","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (Co-IP, KD, OE, morphology), replicated in independent studies","pmids":["21701560"],"is_preprint":false},{"year":2013,"finding":"MiD51 can mediate Drp1 recruitment and mitochondrial fission in the absence of both Fis1 and Mff, demonstrating it acts as an independent Drp1 receptor. Fis1 and Mff regulate the number and size of Drp1 puncta on mitochondria.","method":"Fis1-null, Mff-null, and Fis1/Mff double-null cell lines; immunofluorescence analysis of Drp1 puncta","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic null cell lines with defined phenotypic readout, replicated across labs","pmids":["23283981"],"is_preprint":false},{"year":2013,"finding":"MiD51 overexpression sequesters Drp1 specifically at mitochondria acting as a dominant negative, causing unopposed fusion and peroxisomal elongation. At low-level overexpression forming discrete foci, mitochondrial fission still occurs. Unlike Fis1 and Mff, MiD51 is not targeted to peroxisomes. When MiD51 is artificially targeted to peroxisomes or lysosomes, Drp1 is specifically recruited to those organelles.","method":"Overexpression at varying levels, targeting constructs to peroxisomes/lysosomes, immunofluorescence, mitofusin 1/2 double-knockout cells","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal approaches including organelle-retargeting experiments and genetic epistasis with mitofusins","pmids":["23921378"],"is_preprint":false},{"year":2014,"finding":"Crystal structure of the cytosolic domain of human MiD51 reveals a nucleotidyltransferase fold. MiD51 binds GDP and ADP with high specificity but lacks catalytic transferase residues. Nucleotide-binding mutants still recruit Drp1, but a separate region outside the nucleotidyltransferase fold is required for Drp1 recruitment and foci formation. MiD51 foci depend on Drp1 presence and distribute to daughter organelles after scission.","method":"X-ray crystallography, site-directed mutagenesis, pull-down assays, live-cell imaging","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure plus mutagenesis plus functional assays in one study, independently replicated by PMID:24508339","pmids":["24515348"],"is_preprint":false},{"year":2014,"finding":"MiD51 contains a nucleotidyltransferase domain that binds ADP with high affinity. MiD51 recruits Drp1 via a surface loop independently of ADP binding. However, without ADP, recruited Drp1 cannot be activated for fission: purified MiD51 strongly inhibits Drp1 assembly and GTP hydrolysis in vitro, and ADP addition relieves this inhibition and promotes Drp1 assembly into spirals with enhanced GTPase activity. ADP is thus an essential cofactor for MiD51-mediated fission.","method":"X-ray crystallography, in vitro GTPase assays, Drp1 sedimentation/assembly assays, mutagenesis","journal":"Structure","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure plus in vitro reconstitution with GTPase assays plus mutagenesis; replicated by PMID:24515348","pmids":["24508339"],"is_preprint":false},{"year":2016,"finding":"MiD51 can suppress Mff-dependent enhancement of Drp1 GTPase activity. Proximity-based biotinylation shows close associations between MiD51, Mff, and Drp1, but not Fis1. Loss of MiD51 and Mff together confers greater mitochondrial connectivity and increased resistance to intrinsic apoptosis than loss of either alone.","method":"CRISPR/gene editing knockouts, BioID proximity labeling, Drp1 GTPase activity assay, apoptosis assays","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — GTPase in vitro assay plus CRISPR knockouts plus proximity labeling; comprehensive genetic epistasis","pmids":["27076521"],"is_preprint":false},{"year":2015,"finding":"During UV irradiation-induced apoptosis, the interaction between Fis1 and MiD51/MIEF1 increases while the interaction between Drp1 and MiD51/MIEF1 decreases, suggesting that Fis1 competitively binds MiD51 to release and activate Drp1 indirectly.","method":"Co-immunoprecipitation before/after UV irradiation, western blotting, immunofluorescence","journal":"FASEB journal","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — Co-IP under apoptotic conditions, single lab, two orthogonal methods (Co-IP and imaging)","pmids":["26432782"],"is_preprint":false},{"year":2018,"finding":"MIEF1-MP (MIEF1 microprotein), encoded by a small ORF in the 5'UTR of the MIEF1 transcript, localizes to the mitochondrial matrix and interacts with the mitoribosome. Loss of MIEF1-MP decreases mitochondrial translation rate; elevated MIEF1-MP increases it.","method":"APEX2 proximity labeling, ribosome interaction assays, gain/loss-of-function with mitochondrial translation readout","journal":"Biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — proximity labeling plus functional translation assays, single lab","pmids":["30215512"],"is_preprint":false},{"year":2019,"finding":"Loss of MIEF1 triggers translocation of BAX to mitochondria, decreases mitochondrial membrane potential, and promotes release of DIABLO/SMAC and cytochrome c, sensitizing cells to apoptosis. MIEF1 degradation during staurosporine treatment occurs via the ubiquitin-proteasome system.","method":"MIEF1 knockout cells, flow cytometry, western blotting, live-cell imaging, proteasome inhibitor experiments","journal":"Autophagy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO with multiple mitochondrial functional readouts, single lab","pmids":["30894073"],"is_preprint":false},{"year":2019,"finding":"MIEF1 deficiency impairs mitochondrial respiration and induces oxidative stress, sensitizing cells to PINK1-PRKN-mediated mitophagy. Upon MIEF1 loss, PRKN recruitment to depolarized mitochondria leads to UPS-dependent degradation of MFN2 and FIS1.","method":"MIEF1 knockout, PINK1/PRKN pathway analysis, oxygen consumption rate measurements, western blotting","journal":"Autophagy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO cells with pathway epistasis and functional metabolic readouts, single lab","pmids":["30894073"],"is_preprint":false},{"year":2019,"finding":"Two distinct regions on MiD51 directly bind Drp1; the interaction is regulated by GTP binding to Drp1 and depends on Drp1 polymerization. Dimerization of MiD51 via residue C452 is required for proper regulation of mitochondrial dynamics.","method":"Pull-down assays, mutagenesis of MiD51 (C452), Drp1 GTP-binding mutants, mitochondrial morphology assays","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pull-down with mutagenesis, single lab, two orthogonal approaches","pmids":["30703167"],"is_preprint":false},{"year":2021,"finding":"In intact mammalian cells, Drp1 exists as a mixture of oligomeric assembly states. MIEFs (MIEF1 and MIEF2) bind a wider range of Drp1 assembly states including lower and higher oligomers and recruit both active and inactive Drp1, whereas Mff preferentially binds higher-order Drp1 oligomers and only active forms. MIEFs serve as a platform facilitating Drp1 binding to Mff; loss of MIEFs severely impairs Drp1–Mff interaction. Forced recruitment of Drp1 by MIEFs facilitates Drp1 oligomerization.","method":"In vivo chemical crosslinking, Mff/MIEF1/2-deficient cells, Drp1 oligomerization mutants, co-immunoprecipitation","journal":"Frontiers in cell and developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — chemical crosslinking plus genetic null cells plus Co-IP, single lab","pmids":["34805137"],"is_preprint":false},{"year":2024,"finding":"Long-chain acyl-CoA (LCACA) activates MiD51 by inducing its oligomerization, which stimulates Drp1 GTPase activity. LCACA binds in the previously identified nucleotide-binding pocket of MiD51 (1:1 stoichiometry); a point mutation in this pocket reduces LCACA binding and LCACA-induced oligomerization. In cells, the LCACA-binding mutant fails to form puncta or rescue MiD49/51 knockdown effects on mitochondrial length and Drp1 recruitment. MiD51 oligomers synergize with Mff but not actin filaments in Drp1 activation.","method":"In vitro Drp1 GTPase assay, biochemical binding assays, site-directed mutagenesis, cell-based rescue experiments, oleic acid treatment","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with GTPase assays, mutagenesis, and cellular validation with multiple orthogonal methods in one study","pmids":["38594588"],"is_preprint":false},{"year":2024,"finding":"Actomyosin tension promotes phosphorylation of MIEF1, limiting Drp1 recruitment at mitochondria and inhibiting peri-mitochondrial F-actin formation and mitochondrial fission. DRP1- and MIEF1/2-dependent fission is required and sufficient to regulate YAP/TAZ, SREBP1/2, and NRF2 transcription factors in response to mechanical cues, thereby controlling cell proliferation, lipogenesis, antioxidant metabolism, and adipocyte differentiation.","method":"ECM stiffness manipulation, applied mechanical forces including mouse skin stretching, phosphorylation assays, DRP1/MIEF1/2 loss-of-function, transcription factor activity readouts","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (in vivo mouse model, cell-based mechanical manipulation, loss-of-function, signaling readouts) in one rigorous study","pmids":["39433949"],"is_preprint":false},{"year":2023,"finding":"Fis1 and MiD51 engage in a direct protein-protein interaction; peptide inhibitors (CVP-241, CVP-242) disrupt this interaction in vitro with measured binding affinities (Fis1/MiD51 KD 0.054 µM). Disrupting Fis1/MiD51 PPI increases cardiomyocyte viability under hypoxic stress.","method":"In vitro binding assays (fluorescence), molecular docking, cell viability assays in H9c2 cardiomyocytes","journal":"Frontiers in pharmacology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — in vitro binding assay with peptide inhibitors and cell-based functional validation, single lab","pmids":["38192411"],"is_preprint":false},{"year":2026,"finding":"MAOA interacts directly with MIEF1 (confirmed by co-immunoprecipitation and molecular docking) and enhances MIEF1-DRP1 coupling. Cortisol increases MIEF1 and p-DRP1(Ser616), driving mitochondrial fission; knockdown of MAOA or MIEF1 reduces oxidative stress and mitochondrial fragmentation in trabecular meshwork cells.","method":"Co-immunoprecipitation, molecular docking, molecular dynamics simulations, MAOA/MIEF1 knockdown and overexpression, confocal microscopy","journal":"Free radical biology & medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus molecular dynamics plus loss/gain-of-function, single lab","pmids":["41579974"],"is_preprint":false},{"year":2021,"finding":"Dominant heterozygous mutations in MIEF1 do not disrupt MiD51 localization to the outer mitochondrial membrane or its oligomerization, but significantly disrupt mitochondrial network dynamics, causing optic neuropathy in humans.","method":"Targeted sequencing, high-resolution confocal live imaging, mitochondrial morphology analysis in patient-derived cells","journal":"Molecular neurodegeneration","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — live imaging with quantitative morphology, human genetic variants characterized functionally, single lab","pmids":["33632269"],"is_preprint":false},{"year":2018,"finding":"MiD51 silencing (but not silencing of Fis1 or Mff) causes G1-phase cell cycle arrest through ERK1/2- and CDK4-dependent mechanisms in pulmonary artery smooth muscle cells. MiD upregulation in PAH results from decreased miR-34a-3p expression (epigenetic mechanism).","method":"siRNA knockdown, flow cytometry cell cycle analysis, ERK1/2 and CDK4 pathway analysis, microRNA profiling","journal":"Circulation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA loss-of-function with pathway analysis and cell cycle readout, replicated in preclinical models","pmids":["29431643"],"is_preprint":false},{"year":2025,"finding":"The chromatin remodeler HELLS directly regulates MIEF1 transcription; HELLS knockdown suppresses MIEF1 expression leading to mitochondrial hyperfusion and energy deprivation. The HELLS-MIEF1 axis controls mitochondrial dynamics and genome stability in liver cancer.","method":"Loss/gain-of-function experiments (HELLS KD and MIEF1 KD/OE), mitochondrial morphology imaging, ChIP or transcriptional target identification","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis with loss/gain experiments and functional mitochondrial readouts, single lab","pmids":["40175344"],"is_preprint":false}],"current_model":"MIEF1 (MiD51) is an outer mitochondrial membrane protein that recruits Drp1 from the cytosol to the mitochondrial surface independently of Fis1 and Mff; its nucleotidyltransferase-fold cytosolic domain binds ADP (and long-chain acyl-CoA) as cofactors that relieve MIEF1-mediated inhibition of Drp1 GTPase activity and promote Drp1 assembly into active fission-competent spirals, while Fis1 can competitively displace Drp1 from MIEF1 to further activate fission; mechanical forces phosphorylate MIEF1 to limit Drp1 recruitment, coupling extracellular mechanics to mitochondrial fission and downstream transcription factor (YAP/TAZ, SREBP, NRF2) signaling; additionally, an alternative small ORF within the MIEF1 transcript encodes a microprotein (MIEF1-MP) that localizes to the mitochondrial matrix and stimulates mitochondrial translation via the mitoribosome."},"narrative":{"mechanistic_narrative":"MIEF1 (MiD51) is an outer mitochondrial membrane receptor that directly recruits the cytosolic GTPase Drp1 to the mitochondrial surface, governing the balance between mitochondrial fission and fusion [PMID:21701560, PMID:21508961]. It functions independently of the other Drp1 receptors Fis1 and Mff, acting as an autonomous recruitment platform whose retargeting to peroxisomes or lysosomes is sufficient to draw Drp1 to those organelles [PMID:23283981, PMID:23921378]. Recruitment alone is not activation: its cytosolic domain adopts a catalytically dead nucleotidyltransferase fold that recruits Drp1 through a separate surface loop, while bound nucleotide cofactor is required to convert recruited Drp1 into a fission-competent state — purified MiD51 inhibits Drp1 assembly and GTP hydrolysis, and ADP relieves this inhibition to promote assembly into active spirals [PMID:24515348, PMID:24508339]. Long-chain acyl-CoA occupies the same nucleotide-binding pocket and activates MiD51 by inducing its oligomerization, coupling lipid metabolic state to Drp1 GTPase stimulation [PMID:38594588]. MIEFs further serve as a platform that hands off Drp1 to Mff and broaden the range of Drp1 oligomeric states engaged during fission [PMID:34805137]. Fis1 binds MiD51 directly and can competitively displace Drp1 to further activate fission, particularly under apoptotic stress [PMID:26432782, PMID:38192411]. Mechanical cues feed into this machinery: actomyosin tension drives MIEF1 phosphorylation that limits Drp1 recruitment, and MIEF1/Drp1-dependent fission is required to control YAP/TAZ, SREBP, and NRF2 transcriptional programs governing proliferation, lipogenesis, and antioxidant metabolism [PMID:39433949]. Loss of MIEF1 sensitizes cells to intrinsic apoptosis and PINK1/PRKN-dependent mitophagy [PMID:30894073]. Dominant heterozygous MIEF1 mutations that preserve localization and oligomerization but disrupt mitochondrial network dynamics cause human optic neuropathy [PMID:33632269]. A distinct small ORF in the MIEF1 transcript encodes MIEF1-MP, a mitochondrial matrix microprotein that associates with the mitoribosome and stimulates mitochondrial translation [PMID:30215512].","teleology":[{"year":2011,"claim":"Establishing that mitochondria possess a dedicated Drp1 receptor answered how the fission GTPase is targeted to the organelle surface, identifying MIEF1 as that anchor.","evidence":"Immunofluorescence, reciprocal Co-IP, and knockdown/overexpression in mammalian cells","pmids":["21701560","21508961"],"confidence":"High","gaps":["Did not resolve whether recruitment alone drives fission or requires additional activation","Relationship to existing receptors Fis1/Mff unmapped at this stage"]},{"year":2011,"claim":"Showing MIEF1 recruits Drp1 yet inhibits its fission activity revealed a paradoxical receptor that can promote fusion, distinguishing recruitment from activation.","evidence":"Co-IP, overexpression/knockdown with morphology readout, interaction mapping against Mff/hFis1/Mfn2","pmids":["21701560"],"confidence":"High","gaps":["Molecular basis of the inhibitory activity unknown","Dose-dependence of fusion vs fission phenotype unresolved"]},{"year":2013,"claim":"Genetic null cell lines settled whether MIEF1 acts independently of Fis1 and Mff, confirming it is a bona fide autonomous Drp1 receptor.","evidence":"Fis1-null, Mff-null, and double-null cells with Drp1 puncta imaging; organelle-retargeting constructs","pmids":["23283981","23921378"],"confidence":"High","gaps":["How the receptors functionally divide labor in normal cells not fully defined","Mechanism of MiD51-specific organelle targeting (not peroxisomal) unexplained"]},{"year":2014,"claim":"Crystal structures and in vitro reconstitution defined the cytosolic domain as a catalytically dead nucleotidyltransferase fold and identified bound nucleotide as an essential activation cofactor, mechanistically separating Drp1 recruitment from Drp1 activation.","evidence":"X-ray crystallography, site-directed mutagenesis, in vitro Drp1 GTPase and sedimentation/assembly assays","pmids":["24515348","24508339"],"confidence":"High","gaps":["Physiological identity and dynamics of the bound nucleotide in cells unclear","Whether nucleotide occupancy is regulated by metabolic state not addressed"]},{"year":2016,"claim":"Combining CRISPR knockouts with proximity labeling and GTPase assays placed MIEF1 in functional opposition to Mff and tied it to apoptotic resistance, clarifying receptor crosstalk.","evidence":"CRISPR knockouts, BioID proximity labeling, Drp1 GTPase assay, apoptosis assays","pmids":["27076521"],"confidence":"High","gaps":["Mechanism by which MiD51 suppresses Mff-driven Drp1 activity not defined","Direct vs indirect basis of apoptosis resistance unresolved"]},{"year":2015,"claim":"Tracking receptor interactions through apoptosis suggested Fis1 competitively displaces Drp1 from MiD51 to activate fission, offering a switch mechanism during stress.","evidence":"Co-IP before/after UV irradiation with imaging","pmids":["26432782"],"confidence":"Medium","gaps":["Competitive displacement model inferred from correlated Co-IP, not direct competition assay","Single lab, not reconstituted"]},{"year":2018,"claim":"Discovery that a small ORF in the MIEF1 transcript encodes a matrix microprotein revealed a second, translation-regulating product of the locus distinct from the membrane fission receptor.","evidence":"APEX2 proximity labeling, mitoribosome interaction assays, gain/loss-of-function with translation readout","pmids":["30215512"],"confidence":"Medium","gaps":["Molecular mechanism of mitoribosome stimulation unknown","Single lab; relationship to MiD51 fission function unexplored"]},{"year":2018,"claim":"Linking MiD51 to cell cycle progression and microRNA control extended its role beyond morphology to proliferation in disease contexts.","evidence":"siRNA knockdown, flow cytometry, ERK1/2/CDK4 pathway analysis, miRNA profiling in PASMCs","pmids":["29431643"],"confidence":"Medium","gaps":["Whether cell cycle effect is downstream of fission per se not isolated","Single disease cell context"]},{"year":2019,"claim":"Knockout studies connected MIEF1 loss to apoptotic priming and PINK1/PRKN mitophagy, defining its contribution to mitochondrial quality control and survival.","evidence":"MIEF1 KO cells, flow cytometry, OCR measurements, PINK1/PRKN pathway analysis, proteasome inhibition","pmids":["30894073"],"confidence":"Medium","gaps":["Causal order between fission defect, respiration loss, and mitophagy not fully separated","Single lab"]},{"year":2019,"claim":"Mapping two Drp1-binding regions and a dimerization residue refined the structural rules of the MiD51-Drp1 interaction and its dependence on Drp1 nucleotide state.","evidence":"Pull-downs, C452 and Drp1 GTP-binding mutants, morphology assays","pmids":["30703167"],"confidence":"Medium","gaps":["Stoichiometry of the assembled complex in cells unclear","Single lab"]},{"year":2021,"claim":"In-cell crosslinking showed MIEFs engage a broad range of Drp1 oligomeric states and act as a platform feeding Drp1 to Mff, integrating the two receptors into one assembly pathway.","evidence":"In vivo chemical crosslinking, Mff/MIEF-deficient cells, Drp1 oligomerization mutants, Co-IP","pmids":["34805137"],"confidence":"Medium","gaps":["Temporal sequence of MIEF-to-Mff handoff not resolved","Single lab"]},{"year":2021,"claim":"Functional characterization of dominant human mutations established MIEF1 as a Mendelian disease gene for optic neuropathy acting through impaired network dynamics rather than mislocalization.","evidence":"Targeted sequencing, high-resolution live imaging, morphology analysis in patient-derived cells","pmids":["33632269"],"confidence":"Medium","gaps":["Precise molecular defect of the mutant proteins not pinpointed","Single lab"]},{"year":2024,"claim":"Identifying long-chain acyl-CoA as a pocket-binding activator that drives MiD51 oligomerization linked lipid metabolism directly to Drp1 GTPase stimulation.","evidence":"In vitro GTPase assay, biochemical binding, mutagenesis, cellular rescue with oleic acid treatment","pmids":["38594588"],"confidence":"High","gaps":["In-cell concentrations and regulation of LCACA at the pocket unclear","Interplay between ADP and LCACA occupancy not delineated"]},{"year":2024,"claim":"Demonstrating that mechanical tension phosphorylates MIEF1 to gate Drp1 recruitment placed mitochondrial fission upstream of mechanoresponsive transcription factors, defining a mechanics-to-metabolism signaling axis.","evidence":"ECM stiffness/force manipulation, mouse skin stretching, phosphorylation assays, DRP1/MIEF loss-of-function, transcription factor readouts","pmids":["39433949"],"confidence":"High","gaps":["Identity of the responsible kinase and phosphosite not fully resolved here","Direct link from individual fission events to TF activation incomplete"]},{"year":2026,"claim":"Identifying MAOA as a direct MIEF1 partner that enhances MIEF1-DRP1 coupling extended the receptor's regulation to oxidative-stress-driven fission in disease tissue.","evidence":"Co-IP, molecular docking and dynamics, MAOA/MIEF1 knockdown/overexpression in trabecular meshwork cells","pmids":["41579974"],"confidence":"Medium","gaps":["Mechanism by which MAOA enhances coupling unknown","Single lab and disease context"]},{"year":null,"claim":"How the multiple activating inputs to MIEF1 — nucleotide occupancy, acyl-CoA binding, Fis1 competition, mechanical phosphorylation, and partner binding — are integrated to set fission rate in a single cell remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model linking cofactor state, phosphorylation, and receptor crosstalk","Identity of the mechanoresponsive kinase undefined","Relationship between MiD51 fission function and MIEF1-MP translation function unexplored"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,5,13]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,2,12]},{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[13]}],"localization":[{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[0,8]}],"pathway":[{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[0,2,3]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[9,10]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[14]}],"complexes":[],"partners":["DNM1L","FIS1","MFF","MAOA"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"L0R8F8","full_name":"Mitochondrial ribosome and complex I assembly factor AltMIEF1","aliases":["Alternative MIEF1 protein","AltMIEF1","MIEF1 microprotein","MIEF1-MP","alternative transcript upstream of MiD51","AltMiD51"],"length_aa":70,"mass_kda":8.4,"function":"Assembly factor involved in the biogenesis of the mitochondrial-specific ribosomes (mitoribosomes) (PubMed:28892042, PubMed:30215512, PubMed:31666358). Specifically associates with intermediates of the mitochondrial ribosome large subunit (mt-LSU) and is required for proper ribosome assembly, possibly preventing premature association of the large and small ribosomal subunits (PubMed:28892042, PubMed:30215512, PubMed:31666358). Thereby, indirectly regulates mitochondrial translation (PubMed:28892042, PubMed:30215512, PubMed:31666358). It is also required for complete assembly of the mitochondrial respiratory chain complex I (PubMed:31666358). May also function in DNM1L-mediated mitochondrial fission (PubMed:29083303)","subcellular_location":"Mitochondrion matrix","url":"https://www.uniprot.org/uniprotkb/L0R8F8/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/MIEF1","classification":"Not Classified","n_dependent_lines":22,"n_total_lines":1208,"dependency_fraction":0.018211920529801324},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/MIEF1","total_profiled":1310},"omim":[{"mim_id":"620550","title":"OPTIC ATROPHY 14; OPA14","url":"https://www.omim.org/entry/620550"},{"mim_id":"615498","title":"MITOCHONDRIAL ELONGATION FACTOR 2; MIEF2","url":"https://www.omim.org/entry/615498"},{"mim_id":"615497","title":"MITOCHONDRIAL ELONGATION FACTOR 1; MIEF1","url":"https://www.omim.org/entry/615497"},{"mim_id":"165500","title":"OPTIC ATROPHY 1; OPA1","url":"https://www.omim.org/entry/165500"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Uncertain","locations":[{"location":"Intermediate filaments","reliability":"Uncertain"},{"location":"Mitochondria","reliability":"Uncertain"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/MIEF1"},"hgnc":{"alias_symbol":["FLJ20232","MiD51","L0R8F8","D3A"],"prev_symbol":["SMCR7L"]},"alphafold":{"accession":"L0R8F8","domains":[{"cath_id":"-","chopping":"2-7_26-60","consensus_level":"medium","plddt":88.1088,"start":2,"end":60}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/L0R8F8","model_url":"https://alphafold.ebi.ac.uk/files/AF-L0R8F8-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-L0R8F8-F1-predicted_aligned_error_v6.png","plddt_mean":86.0},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=MIEF1","jax_strain_url":"https://www.jax.org/strain/search?query=MIEF1"},"sequence":{"accession":"L0R8F8","fasta_url":"https://rest.uniprot.org/uniprotkb/L0R8F8.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/L0R8F8/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/L0R8F8"}},"corpus_meta":[{"pmid":"23283981","id":"PMC_23283981","title":"Fis1, Mff, MiD49, and MiD51 mediate Drp1 recruitment in mitochondrial fission.","date":"2013","source":"Molecular biology of the cell","url":"https://pubmed.ncbi.nlm.nih.gov/23283981","citation_count":1008,"is_preprint":false},{"pmid":"21508961","id":"PMC_21508961","title":"MiD49 and MiD51, new components of the mitochondrial fission machinery.","date":"2011","source":"EMBO reports","url":"https://pubmed.ncbi.nlm.nih.gov/21508961","citation_count":518,"is_preprint":false},{"pmid":"21701560","id":"PMC_21701560","title":"Human MIEF1 recruits Drp1 to mitochondrial outer membranes and promotes mitochondrial fusion rather than fission.","date":"2011","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/21701560","citation_count":297,"is_preprint":false},{"pmid":"27076521","id":"PMC_27076521","title":"Cooperative and independent roles of the Drp1 adaptors Mff, MiD49 and MiD51 in mitochondrial fission.","date":"2016","source":"Journal of cell science","url":"https://pubmed.ncbi.nlm.nih.gov/27076521","citation_count":265,"is_preprint":false},{"pmid":"23921378","id":"PMC_23921378","title":"Adaptor proteins MiD49 and MiD51 can act independently of Mff and Fis1 in Drp1 recruitment and are specific for mitochondrial fission.","date":"2013","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/23921378","citation_count":248,"is_preprint":false},{"pmid":"29431643","id":"PMC_29431643","title":"Epigenetic Dysregulation of the Dynamin-Related Protein 1 Binding Partners MiD49 and MiD51 Increases Mitotic Mitochondrial Fission and Promotes Pulmonary Arterial Hypertension: Mechanistic and Therapeutic Implications.","date":"2018","source":"Circulation","url":"https://pubmed.ncbi.nlm.nih.gov/29431643","citation_count":147,"is_preprint":false},{"pmid":"26432782","id":"PMC_26432782","title":"Drp1, Mff, Fis1, and MiD51 are coordinated to mediate mitochondrial fission during UV irradiation-induced apoptosis.","date":"2015","source":"FASEB journal : official publication of the Federation of American Societies for Experimental Biology","url":"https://pubmed.ncbi.nlm.nih.gov/26432782","citation_count":100,"is_preprint":false},{"pmid":"27660309","id":"PMC_27660309","title":"The role of Drp1 adaptor proteins MiD49 and MiD51 in mitochondrial fission: implications for human disease.","date":"2016","source":"Clinical science (London, England : 1979)","url":"https://pubmed.ncbi.nlm.nih.gov/27660309","citation_count":98,"is_preprint":false},{"pmid":"24515348","id":"PMC_24515348","title":"Structural and functional analysis of MiD51, a dynamin receptor required for mitochondrial fission.","date":"2014","source":"The Journal of cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/24515348","citation_count":85,"is_preprint":false},{"pmid":"30215512","id":"PMC_30215512","title":"MIEF1 Microprotein Regulates Mitochondrial 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MIEF1 also interacts with hFis1, and elevated hFis1 partially reverses MIEF1-induced fusion.\",\n      \"method\": \"Co-immunoprecipitation, overexpression and knockdown with mitochondrial morphology readout, interaction mapping with Mff/hFis1/Mfn2\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (Co-IP, KD, OE, morphology), replicated in independent studies\",\n      \"pmids\": [\"21701560\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"MiD51 can mediate Drp1 recruitment and mitochondrial fission in the absence of both Fis1 and Mff, demonstrating it acts as an independent Drp1 receptor. Fis1 and Mff regulate the number and size of Drp1 puncta on mitochondria.\",\n      \"method\": \"Fis1-null, Mff-null, and Fis1/Mff double-null cell lines; immunofluorescence analysis of Drp1 puncta\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic null cell lines with defined phenotypic readout, replicated across labs\",\n      \"pmids\": [\"23283981\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"MiD51 overexpression sequesters Drp1 specifically at mitochondria acting as a dominant negative, causing unopposed fusion and peroxisomal elongation. At low-level overexpression forming discrete foci, mitochondrial fission still occurs. Unlike Fis1 and Mff, MiD51 is not targeted to peroxisomes. When MiD51 is artificially targeted to peroxisomes or lysosomes, Drp1 is specifically recruited to those organelles.\",\n      \"method\": \"Overexpression at varying levels, targeting constructs to peroxisomes/lysosomes, immunofluorescence, mitofusin 1/2 double-knockout cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal approaches including organelle-retargeting experiments and genetic epistasis with mitofusins\",\n      \"pmids\": [\"23921378\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Crystal structure of the cytosolic domain of human MiD51 reveals a nucleotidyltransferase fold. MiD51 binds GDP and ADP with high specificity but lacks catalytic transferase residues. Nucleotide-binding mutants still recruit Drp1, but a separate region outside the nucleotidyltransferase fold is required for Drp1 recruitment and foci formation. MiD51 foci depend on Drp1 presence and distribute to daughter organelles after scission.\",\n      \"method\": \"X-ray crystallography, site-directed mutagenesis, pull-down assays, live-cell imaging\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure plus mutagenesis plus functional assays in one study, independently replicated by PMID:24508339\",\n      \"pmids\": [\"24515348\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"MiD51 contains a nucleotidyltransferase domain that binds ADP with high affinity. MiD51 recruits Drp1 via a surface loop independently of ADP binding. However, without ADP, recruited Drp1 cannot be activated for fission: purified MiD51 strongly inhibits Drp1 assembly and GTP hydrolysis in vitro, and ADP addition relieves this inhibition and promotes Drp1 assembly into spirals with enhanced GTPase activity. ADP is thus an essential cofactor for MiD51-mediated fission.\",\n      \"method\": \"X-ray crystallography, in vitro GTPase assays, Drp1 sedimentation/assembly assays, mutagenesis\",\n      \"journal\": \"Structure\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure plus in vitro reconstitution with GTPase assays plus mutagenesis; replicated by PMID:24515348\",\n      \"pmids\": [\"24508339\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"MiD51 can suppress Mff-dependent enhancement of Drp1 GTPase activity. Proximity-based biotinylation shows close associations between MiD51, Mff, and Drp1, but not Fis1. Loss of MiD51 and Mff together confers greater mitochondrial connectivity and increased resistance to intrinsic apoptosis than loss of either alone.\",\n      \"method\": \"CRISPR/gene editing knockouts, BioID proximity labeling, Drp1 GTPase activity assay, apoptosis assays\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — GTPase in vitro assay plus CRISPR knockouts plus proximity labeling; comprehensive genetic epistasis\",\n      \"pmids\": [\"27076521\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"During UV irradiation-induced apoptosis, the interaction between Fis1 and MiD51/MIEF1 increases while the interaction between Drp1 and MiD51/MIEF1 decreases, suggesting that Fis1 competitively binds MiD51 to release and activate Drp1 indirectly.\",\n      \"method\": \"Co-immunoprecipitation before/after UV irradiation, western blotting, immunofluorescence\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — Co-IP under apoptotic conditions, single lab, two orthogonal methods (Co-IP and imaging)\",\n      \"pmids\": [\"26432782\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"MIEF1-MP (MIEF1 microprotein), encoded by a small ORF in the 5'UTR of the MIEF1 transcript, localizes to the mitochondrial matrix and interacts with the mitoribosome. Loss of MIEF1-MP decreases mitochondrial translation rate; elevated MIEF1-MP increases it.\",\n      \"method\": \"APEX2 proximity labeling, ribosome interaction assays, gain/loss-of-function with mitochondrial translation readout\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — proximity labeling plus functional translation assays, single lab\",\n      \"pmids\": [\"30215512\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Loss of MIEF1 triggers translocation of BAX to mitochondria, decreases mitochondrial membrane potential, and promotes release of DIABLO/SMAC and cytochrome c, sensitizing cells to apoptosis. MIEF1 degradation during staurosporine treatment occurs via the ubiquitin-proteasome system.\",\n      \"method\": \"MIEF1 knockout cells, flow cytometry, western blotting, live-cell imaging, proteasome inhibitor experiments\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO with multiple mitochondrial functional readouts, single lab\",\n      \"pmids\": [\"30894073\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"MIEF1 deficiency impairs mitochondrial respiration and induces oxidative stress, sensitizing cells to PINK1-PRKN-mediated mitophagy. Upon MIEF1 loss, PRKN recruitment to depolarized mitochondria leads to UPS-dependent degradation of MFN2 and FIS1.\",\n      \"method\": \"MIEF1 knockout, PINK1/PRKN pathway analysis, oxygen consumption rate measurements, western blotting\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO cells with pathway epistasis and functional metabolic readouts, single lab\",\n      \"pmids\": [\"30894073\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Two distinct regions on MiD51 directly bind Drp1; the interaction is regulated by GTP binding to Drp1 and depends on Drp1 polymerization. Dimerization of MiD51 via residue C452 is required for proper regulation of mitochondrial dynamics.\",\n      \"method\": \"Pull-down assays, mutagenesis of MiD51 (C452), Drp1 GTP-binding mutants, mitochondrial morphology assays\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pull-down with mutagenesis, single lab, two orthogonal approaches\",\n      \"pmids\": [\"30703167\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"In intact mammalian cells, Drp1 exists as a mixture of oligomeric assembly states. MIEFs (MIEF1 and MIEF2) bind a wider range of Drp1 assembly states including lower and higher oligomers and recruit both active and inactive Drp1, whereas Mff preferentially binds higher-order Drp1 oligomers and only active forms. MIEFs serve as a platform facilitating Drp1 binding to Mff; loss of MIEFs severely impairs Drp1–Mff interaction. Forced recruitment of Drp1 by MIEFs facilitates Drp1 oligomerization.\",\n      \"method\": \"In vivo chemical crosslinking, Mff/MIEF1/2-deficient cells, Drp1 oligomerization mutants, co-immunoprecipitation\",\n      \"journal\": \"Frontiers in cell and developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — chemical crosslinking plus genetic null cells plus Co-IP, single lab\",\n      \"pmids\": [\"34805137\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Long-chain acyl-CoA (LCACA) activates MiD51 by inducing its oligomerization, which stimulates Drp1 GTPase activity. LCACA binds in the previously identified nucleotide-binding pocket of MiD51 (1:1 stoichiometry); a point mutation in this pocket reduces LCACA binding and LCACA-induced oligomerization. In cells, the LCACA-binding mutant fails to form puncta or rescue MiD49/51 knockdown effects on mitochondrial length and Drp1 recruitment. MiD51 oligomers synergize with Mff but not actin filaments in Drp1 activation.\",\n      \"method\": \"In vitro Drp1 GTPase assay, biochemical binding assays, site-directed mutagenesis, cell-based rescue experiments, oleic acid treatment\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with GTPase assays, mutagenesis, and cellular validation with multiple orthogonal methods in one study\",\n      \"pmids\": [\"38594588\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Actomyosin tension promotes phosphorylation of MIEF1, limiting Drp1 recruitment at mitochondria and inhibiting peri-mitochondrial F-actin formation and mitochondrial fission. DRP1- and MIEF1/2-dependent fission is required and sufficient to regulate YAP/TAZ, SREBP1/2, and NRF2 transcription factors in response to mechanical cues, thereby controlling cell proliferation, lipogenesis, antioxidant metabolism, and adipocyte differentiation.\",\n      \"method\": \"ECM stiffness manipulation, applied mechanical forces including mouse skin stretching, phosphorylation assays, DRP1/MIEF1/2 loss-of-function, transcription factor activity readouts\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (in vivo mouse model, cell-based mechanical manipulation, loss-of-function, signaling readouts) in one rigorous study\",\n      \"pmids\": [\"39433949\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Fis1 and MiD51 engage in a direct protein-protein interaction; peptide inhibitors (CVP-241, CVP-242) disrupt this interaction in vitro with measured binding affinities (Fis1/MiD51 KD 0.054 µM). Disrupting Fis1/MiD51 PPI increases cardiomyocyte viability under hypoxic stress.\",\n      \"method\": \"In vitro binding assays (fluorescence), molecular docking, cell viability assays in H9c2 cardiomyocytes\",\n      \"journal\": \"Frontiers in pharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — in vitro binding assay with peptide inhibitors and cell-based functional validation, single lab\",\n      \"pmids\": [\"38192411\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"MAOA interacts directly with MIEF1 (confirmed by co-immunoprecipitation and molecular docking) and enhances MIEF1-DRP1 coupling. Cortisol increases MIEF1 and p-DRP1(Ser616), driving mitochondrial fission; knockdown of MAOA or MIEF1 reduces oxidative stress and mitochondrial fragmentation in trabecular meshwork cells.\",\n      \"method\": \"Co-immunoprecipitation, molecular docking, molecular dynamics simulations, MAOA/MIEF1 knockdown and overexpression, confocal microscopy\",\n      \"journal\": \"Free radical biology & medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus molecular dynamics plus loss/gain-of-function, single lab\",\n      \"pmids\": [\"41579974\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Dominant heterozygous mutations in MIEF1 do not disrupt MiD51 localization to the outer mitochondrial membrane or its oligomerization, but significantly disrupt mitochondrial network dynamics, causing optic neuropathy in humans.\",\n      \"method\": \"Targeted sequencing, high-resolution confocal live imaging, mitochondrial morphology analysis in patient-derived cells\",\n      \"journal\": \"Molecular neurodegeneration\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — live imaging with quantitative morphology, human genetic variants characterized functionally, single lab\",\n      \"pmids\": [\"33632269\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"MiD51 silencing (but not silencing of Fis1 or Mff) causes G1-phase cell cycle arrest through ERK1/2- and CDK4-dependent mechanisms in pulmonary artery smooth muscle cells. MiD upregulation in PAH results from decreased miR-34a-3p expression (epigenetic mechanism).\",\n      \"method\": \"siRNA knockdown, flow cytometry cell cycle analysis, ERK1/2 and CDK4 pathway analysis, microRNA profiling\",\n      \"journal\": \"Circulation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA loss-of-function with pathway analysis and cell cycle readout, replicated in preclinical models\",\n      \"pmids\": [\"29431643\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"The chromatin remodeler HELLS directly regulates MIEF1 transcription; HELLS knockdown suppresses MIEF1 expression leading to mitochondrial hyperfusion and energy deprivation. The HELLS-MIEF1 axis controls mitochondrial dynamics and genome stability in liver cancer.\",\n      \"method\": \"Loss/gain-of-function experiments (HELLS KD and MIEF1 KD/OE), mitochondrial morphology imaging, ChIP or transcriptional target identification\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis with loss/gain experiments and functional mitochondrial readouts, single lab\",\n      \"pmids\": [\"40175344\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"MIEF1 (MiD51) is an outer mitochondrial membrane protein that recruits Drp1 from the cytosol to the mitochondrial surface independently of Fis1 and Mff; its nucleotidyltransferase-fold cytosolic domain binds ADP (and long-chain acyl-CoA) as cofactors that relieve MIEF1-mediated inhibition of Drp1 GTPase activity and promote Drp1 assembly into active fission-competent spirals, while Fis1 can competitively displace Drp1 from MIEF1 to further activate fission; mechanical forces phosphorylate MIEF1 to limit Drp1 recruitment, coupling extracellular mechanics to mitochondrial fission and downstream transcription factor (YAP/TAZ, SREBP, NRF2) signaling; additionally, an alternative small ORF within the MIEF1 transcript encodes a microprotein (MIEF1-MP) that localizes to the mitochondrial matrix and stimulates mitochondrial translation via the mitoribosome.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"MIEF1 (MiD51) is an outer mitochondrial membrane receptor that directly recruits the cytosolic GTPase Drp1 to the mitochondrial surface, governing the balance between mitochondrial fission and fusion [#0]. It functions independently of the other Drp1 receptors Fis1 and Mff, acting as an autonomous recruitment platform whose retargeting to peroxisomes or lysosomes is sufficient to draw Drp1 to those organelles [#2, #3]. Recruitment alone is not activation: its cytosolic domain adopts a catalytically dead nucleotidyltransferase fold that recruits Drp1 through a separate surface loop, while bound nucleotide cofactor is required to convert recruited Drp1 into a fission-competent state — purified MiD51 inhibits Drp1 assembly and GTP hydrolysis, and ADP relieves this inhibition to promote assembly into active spirals [#4, #5]. Long-chain acyl-CoA occupies the same nucleotide-binding pocket and activates MiD51 by inducing its oligomerization, coupling lipid metabolic state to Drp1 GTPase stimulation [#13]. MIEFs further serve as a platform that hands off Drp1 to Mff and broaden the range of Drp1 oligomeric states engaged during fission [#12]. Fis1 binds MiD51 directly and can competitively displace Drp1 to further activate fission, particularly under apoptotic stress [#7, #15]. Mechanical cues feed into this machinery: actomyosin tension drives MIEF1 phosphorylation that limits Drp1 recruitment, and MIEF1/Drp1-dependent fission is required to control YAP/TAZ, SREBP, and NRF2 transcriptional programs governing proliferation, lipogenesis, and antioxidant metabolism [#14]. Loss of MIEF1 sensitizes cells to intrinsic apoptosis and PINK1/PRKN-dependent mitophagy [#9, #10]. Dominant heterozygous MIEF1 mutations that preserve localization and oligomerization but disrupt mitochondrial network dynamics cause human optic neuropathy [#17]. A distinct small ORF in the MIEF1 transcript encodes MIEF1-MP, a mitochondrial matrix microprotein that associates with the mitoribosome and stimulates mitochondrial translation [#8].\",\n  \"teleology\": [\n    {\n      \"year\": 2011,\n      \"claim\": \"Establishing that mitochondria possess a dedicated Drp1 receptor answered how the fission GTPase is targeted to the organelle surface, identifying MIEF1 as that anchor.\",\n      \"evidence\": \"Immunofluorescence, reciprocal Co-IP, and knockdown/overexpression in mammalian cells\",\n      \"pmids\": [\"21701560\", \"21508961\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve whether recruitment alone drives fission or requires additional activation\", \"Relationship to existing receptors Fis1/Mff unmapped at this stage\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Showing MIEF1 recruits Drp1 yet inhibits its fission activity revealed a paradoxical receptor that can promote fusion, distinguishing recruitment from activation.\",\n      \"evidence\": \"Co-IP, overexpression/knockdown with morphology readout, interaction mapping against Mff/hFis1/Mfn2\",\n      \"pmids\": [\"21701560\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of the inhibitory activity unknown\", \"Dose-dependence of fusion vs fission phenotype unresolved\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Genetic null cell lines settled whether MIEF1 acts independently of Fis1 and Mff, confirming it is a bona fide autonomous Drp1 receptor.\",\n      \"evidence\": \"Fis1-null, Mff-null, and double-null cells with Drp1 puncta imaging; organelle-retargeting constructs\",\n      \"pmids\": [\"23283981\", \"23921378\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How the receptors functionally divide labor in normal cells not fully defined\", \"Mechanism of MiD51-specific organelle targeting (not peroxisomal) unexplained\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Crystal structures and in vitro reconstitution defined the cytosolic domain as a catalytically dead nucleotidyltransferase fold and identified bound nucleotide as an essential activation cofactor, mechanistically separating Drp1 recruitment from Drp1 activation.\",\n      \"evidence\": \"X-ray crystallography, site-directed mutagenesis, in vitro Drp1 GTPase and sedimentation/assembly assays\",\n      \"pmids\": [\"24515348\", \"24508339\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological identity and dynamics of the bound nucleotide in cells unclear\", \"Whether nucleotide occupancy is regulated by metabolic state not addressed\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Combining CRISPR knockouts with proximity labeling and GTPase assays placed MIEF1 in functional opposition to Mff and tied it to apoptotic resistance, clarifying receptor crosstalk.\",\n      \"evidence\": \"CRISPR knockouts, BioID proximity labeling, Drp1 GTPase assay, apoptosis assays\",\n      \"pmids\": [\"27076521\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which MiD51 suppresses Mff-driven Drp1 activity not defined\", \"Direct vs indirect basis of apoptosis resistance unresolved\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Tracking receptor interactions through apoptosis suggested Fis1 competitively displaces Drp1 from MiD51 to activate fission, offering a switch mechanism during stress.\",\n      \"evidence\": \"Co-IP before/after UV irradiation with imaging\",\n      \"pmids\": [\"26432782\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Competitive displacement model inferred from correlated Co-IP, not direct competition assay\", \"Single lab, not reconstituted\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Discovery that a small ORF in the MIEF1 transcript encodes a matrix microprotein revealed a second, translation-regulating product of the locus distinct from the membrane fission receptor.\",\n      \"evidence\": \"APEX2 proximity labeling, mitoribosome interaction assays, gain/loss-of-function with translation readout\",\n      \"pmids\": [\"30215512\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular mechanism of mitoribosome stimulation unknown\", \"Single lab; relationship to MiD51 fission function unexplored\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Linking MiD51 to cell cycle progression and microRNA control extended its role beyond morphology to proliferation in disease contexts.\",\n      \"evidence\": \"siRNA knockdown, flow cytometry, ERK1/2/CDK4 pathway analysis, miRNA profiling in PASMCs\",\n      \"pmids\": [\"29431643\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether cell cycle effect is downstream of fission per se not isolated\", \"Single disease cell context\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Knockout studies connected MIEF1 loss to apoptotic priming and PINK1/PRKN mitophagy, defining its contribution to mitochondrial quality control and survival.\",\n      \"evidence\": \"MIEF1 KO cells, flow cytometry, OCR measurements, PINK1/PRKN pathway analysis, proteasome inhibition\",\n      \"pmids\": [\"30894073\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Causal order between fission defect, respiration loss, and mitophagy not fully separated\", \"Single lab\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Mapping two Drp1-binding regions and a dimerization residue refined the structural rules of the MiD51-Drp1 interaction and its dependence on Drp1 nucleotide state.\",\n      \"evidence\": \"Pull-downs, C452 and Drp1 GTP-binding mutants, morphology assays\",\n      \"pmids\": [\"30703167\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Stoichiometry of the assembled complex in cells unclear\", \"Single lab\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"In-cell crosslinking showed MIEFs engage a broad range of Drp1 oligomeric states and act as a platform feeding Drp1 to Mff, integrating the two receptors into one assembly pathway.\",\n      \"evidence\": \"In vivo chemical crosslinking, Mff/MIEF-deficient cells, Drp1 oligomerization mutants, Co-IP\",\n      \"pmids\": [\"34805137\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Temporal sequence of MIEF-to-Mff handoff not resolved\", \"Single lab\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Functional characterization of dominant human mutations established MIEF1 as a Mendelian disease gene for optic neuropathy acting through impaired network dynamics rather than mislocalization.\",\n      \"evidence\": \"Targeted sequencing, high-resolution live imaging, morphology analysis in patient-derived cells\",\n      \"pmids\": [\"33632269\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Precise molecular defect of the mutant proteins not pinpointed\", \"Single lab\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Identifying long-chain acyl-CoA as a pocket-binding activator that drives MiD51 oligomerization linked lipid metabolism directly to Drp1 GTPase stimulation.\",\n      \"evidence\": \"In vitro GTPase assay, biochemical binding, mutagenesis, cellular rescue with oleic acid treatment\",\n      \"pmids\": [\"38594588\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In-cell concentrations and regulation of LCACA at the pocket unclear\", \"Interplay between ADP and LCACA occupancy not delineated\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Demonstrating that mechanical tension phosphorylates MIEF1 to gate Drp1 recruitment placed mitochondrial fission upstream of mechanoresponsive transcription factors, defining a mechanics-to-metabolism signaling axis.\",\n      \"evidence\": \"ECM stiffness/force manipulation, mouse skin stretching, phosphorylation assays, DRP1/MIEF loss-of-function, transcription factor readouts\",\n      \"pmids\": [\"39433949\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the responsible kinase and phosphosite not fully resolved here\", \"Direct link from individual fission events to TF activation incomplete\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Identifying MAOA as a direct MIEF1 partner that enhances MIEF1-DRP1 coupling extended the receptor's regulation to oxidative-stress-driven fission in disease tissue.\",\n      \"evidence\": \"Co-IP, molecular docking and dynamics, MAOA/MIEF1 knockdown/overexpression in trabecular meshwork cells\",\n      \"pmids\": [\"41579974\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which MAOA enhances coupling unknown\", \"Single lab and disease context\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the multiple activating inputs to MIEF1 — nucleotide occupancy, acyl-CoA binding, Fis1 competition, mechanical phosphorylation, and partner binding — are integrated to set fission rate in a single cell remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model linking cofactor state, phosphorylation, and receptor crosstalk\", \"Identity of the mechanoresponsive kinase undefined\", \"Relationship between MiD51 fission function and MIEF1-MP translation function unexplored\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 5, 13]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 2, 12]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [13]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005741\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [0, 8]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [0, 2, 3]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [9, 10]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [14]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"DNM1L\", \"FIS1\", \"MFF\", \"MAOA\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":9,"faith_total":10,"faith_pct":90.0}}