{"gene":"MTX1","run_date":"2026-04-29T11:37:56","timeline":{"discoveries":[{"year":1997,"finding":"Metaxin 1 (MTX1) is a mitochondrial outer membrane protein anchored via a C-terminal transmembrane domain with its N-terminal region exposed to the cytosol. Anti-metaxin antibodies partially inhibited import of radiolabeled preadrenodoxin into mitochondria, establishing MTX1 as a component of the mitochondrial preprotein import machinery of the outer membrane. MTX1 shows sequence similarity to yeast Tom37 but with distinct targeting mechanisms.","method":"Immunofluorescence localization in COS cells, protease protection assay on intact mitochondria, antibody inhibition of in vitro protein import, C-terminal truncation mutagenesis","journal":"The Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 1-2 — multiple orthogonal methods (localization, import inhibition, mutagenesis) in single rigorous study","pmids":["9045676"],"is_preprint":false},{"year":1996,"finding":"The human MTX1 gene spans 6 kb with eight protein-coding exons and encodes a 317-amino acid protein (91.5% identical to mouse metaxin). MTX1 is contiguous to THBS3 (sharing a common promoter, transcribed convergently) and adjacent to the glucocerebrosidase pseudogene (psGBA). The predicted protein lacks an N-terminal signal sequence but contains a putative C-terminal transmembrane domain. A pseudogene (psMTX) was identified within the GBA/psGBA region, containing a 278-amino acid ORF 97.8% identical to metaxin but lacking the first intron and promoter and not expressed in liver.","method":"Genomic sequencing, exon mapping, Northern blotting, sequence analysis","journal":"Genomics","confidence":"High","confidence_rationale":"Tier 2 — comprehensive genomic characterization with expression validation","pmids":["8660965"],"is_preprint":false},{"year":1997,"finding":"MTX1 (metaxin) was identified immediately downstream of the glucocerebrosidase pseudogene (psGBA) on chromosome 1q21. The genomic organization of the 75-kb region revealed that the duplication giving rise to psGBA also produced a pseudogene for MTX1, establishing MTX1's chromosomal context and its co-duplication with GBA.","method":"Genomic sequencing, restriction mapping, gene identification","journal":"Genome Research","confidence":"Medium","confidence_rationale":"Tier 2 — genomic characterization, single study","pmids":["9331372"],"is_preprint":false},{"year":2007,"finding":"MTX1 (metaxin 1) exists in a high-molecular-weight complex with mitofilin (inner membrane), metaxin 2, SAM50, CHCHD3, CHCHD6, and DnaJC11, as revealed by immunocapture with an anti-mitofilin monoclonal antibody followed by mass spectrometry. This complex bridges the inner and outer mitochondrial membranes and likely functions in protein import and maintenance of mitochondrial structure.","method":"Monoclonal antibody immunocapture, SDS-PAGE, mass spectrometry identification of co-purifying proteins","journal":"FEBS Letters","confidence":"High","confidence_rationale":"Tier 2 — reciprocal co-purification with MS identification, multiple subunits identified","pmids":["17624330"],"is_preprint":false},{"year":2007,"finding":"Depletion of metaxin 2 by RNAi caused reduction of metaxin 1 (MTX1) steady-state levels and deficient import and assembly of VDAC and Tom40 (but not matrix-targeted precursors), placing MTX1 in the pathway of beta-barrel protein biogenesis at the mitochondrial outer membrane. Reduction of Sam50 also led to decreased levels of both metaxin 1 and metaxin 2, indicating interdependence among Sam50, MTX1, and metaxin 2.","method":"RNAi knockdown, in vitro mitochondrial import assay with radiolabeled precursors, immunoblotting for steady-state levels","journal":"EMBO Reports","confidence":"High","confidence_rationale":"Tier 1-2 — functional import assays with RNAi and radiolabeled substrates, multiple targets tested","pmids":["17510655"],"is_preprint":false},{"year":2005,"finding":"Human Tom40 import involves the TOM complex as a first stable intermediate on the outer face, followed by membrane integration; metaxins (including MTX1) constitute part of the mammalian SAM complex through which Tom40 assembly is routed. Depletion of human Sam50 reduces Tom40 assembly, linking MTX1-containing complexes to the beta-barrel assembly pathway.","method":"In vitro import assay with radiolabeled Tom40 precursor, blue native PAGE to detect import intermediates, RNAi depletion of Sam50","journal":"The Journal of Biological Chemistry","confidence":"Medium","confidence_rationale":"Tier 2 — in vitro import assays with intermediate characterization; MTX1 role inferred from complex membership","pmids":["15644312"],"is_preprint":false},{"year":2011,"finding":"MTX1 (metaxin 1) was identified as a component of mitofilin/MINOS complexes in human mitochondria by proteomic analyses. Disruption of MINOS1 affects mitochondrial morphology and inner membrane organization, and MTX1-containing complexes bridge inner and outer membranes.","method":"Co-immunoprecipitation, mass spectrometry proteomics of mitofilin complexes, electron microscopy of mitochondrial ultrastructure","journal":"Molecular Biology of the Cell","confidence":"Medium","confidence_rationale":"Tier 2-3 — proteomic identification of complex membership, single study","pmids":["22114354"],"is_preprint":false},{"year":2015,"finding":"Systematic analysis of the MICOS/MIB complex revealed that MTX1 is a component of the complete MIB (mitochondrial intermembrane space bridging) complex (form C), which also contains all MICOS proteins, SAMM50, MTX2, MTX3, and DNAJC11. MTX1 is distinguished from MTX2 and MTX3 in that it associates specifically with the fully assembled MIB complex rather than the membrane-bridging subcomplex.","method":"Mitochondrial protein complexome profiling, blue native PAGE, evolutionary distribution analysis across species","journal":"Biochimica et Biophysica Acta","confidence":"Medium","confidence_rationale":"Tier 2 — complexome profiling with subcomplex resolution; MTX1-specific localization within MIB defined","pmids":["26477565"],"is_preprint":false},{"year":2016,"finding":"Affinity enrichment mass spectrometry of 50 mitochondrial proteins identified MTX1 as part of the mitochondrial interactome, confirming its association with the outer membrane import and assembly machinery. MTX1 interactions were catalogued as part of a network connecting diverse mitochondrial processes including respiratory chain function.","method":"Affinity enrichment mass spectrometry (AP-MS) of 50 mitochondrial bait proteins","journal":"Molecular Cell","confidence":"Medium","confidence_rationale":"Tier 2 — large-scale systematic AP-MS; MTX1 interactions part of broader network","pmids":["27499296"],"is_preprint":false},{"year":2020,"finding":"BioID proximity labeling using 100 mitochondrial baits (including outer membrane markers) identified MTX1 proximity interactions in the human mitochondrial outer membrane neighborhood. MTX1 showed proximity to proteins at the interface between the mitochondrial outer membrane and the endoplasmic reticulum, relevant to mitochondrial homeostasis.","method":"BioID proximity-dependent biotinylation with 100 mitochondrial bait proteins, mass spectrometry","journal":"Cell Metabolism","confidence":"Medium","confidence_rationale":"Tier 2 — systematic BioID across mitochondrial compartments; proximity interactions defined","pmids":["32877691"],"is_preprint":false},{"year":2017,"finding":"LC3C- and p62-dependent piecemeal mitophagy involves the autophagic degradation of individual mitochondrial proteins including components of the outer membrane. Autophagosomal content profiling identified MTX1 among mitochondrial outer membrane proteins subject to selective autophagic degradation, implicating MTX1 in mitochondrial quality control via piecemeal mitophagy.","method":"Proximity labeling (BioID on autophagosomal markers) combined with quantitative proteomics to profile autophagosome contents","journal":"Molecular Cell","confidence":"Medium","confidence_rationale":"Tier 2 — proximity labeling proteomics of autophagosomes; MTX1 identified as substrate","pmids":["29149599"],"is_preprint":false},{"year":2011,"finding":"The MTX1 c.184T>A (p.S63T) variant was found in 93% of GBA mutation carriers (PD patients and healthy controls) versus 64% of non-carriers (p=0.0008). Homozygosity for the MTX1 c.184A/A genotype was associated with significantly earlier age of motor symptom onset in GBA-associated Parkinson's disease patients (5.1–5.9 years younger, p=0.002–0.01), and higher frequency of early-onset PD (<50 years) in GBA+MTX1 homozygous carriers (35.9% vs 13.6–17.5%, p=0.028). The c.184A allele is in strong linkage disequilibrium with the GBA p.N370S mutation.","method":"Sequencing of entire MTX1 coding region and exon-intron boundaries in 81 PD-GBA carriers and controls; population genotyping of 600 PD patients and 353 controls; statistical association analysis","journal":"Neurogenetics","confidence":"Medium","confidence_rationale":"Tier 3 — genetic association with functional implication (MTX1 variant modifies disease onset), single study, no direct mechanistic experiment","pmids":["21837367"],"is_preprint":false},{"year":2021,"finding":"Genome-scale CRISPRa screening identified MTX1 (Metaxin 1) as a contributor to sorafenib resistance in hepatocellular carcinoma (HCC). MTX1 overexpression promoted HCC cell proliferation in vitro and in vivo, decreased apoptosis upon sorafenib treatment, and enhanced autophagy. Mechanistically, MTX1 overexpression promoted autophagy by interacting with and inhibiting CISD1 (CDGSH iron sulfur domain 1, an autophagy negative regulator), as shown by co-immunoprecipitation.","method":"Genome-scale CRISPRa screen, overexpression and knockdown experiments, subcutaneous xenograft models, co-immunoprecipitation (MTX1-CISD1 interaction), autophagy flux assays","journal":"International Journal of Biological Sciences","confidence":"Medium","confidence_rationale":"Tier 2-3 — CRISPRa screen validated by OE/KD with xenograft and Co-IP; mechanistic link to CISD1 shown by single Co-IP","pmids":["34421355"],"is_preprint":false},{"year":2015,"finding":"High-throughput AP-MS (BioPlex network) identified MTX1 protein-protein interactions in HEK293T cells, placing MTX1 within a network community consistent with its mitochondrial outer membrane function and import complex role.","method":"Affinity purification mass spectrometry (AP-MS) of 2,594 human proteins in HEK293T cells","journal":"Cell","confidence":"Low","confidence_rationale":"Tier 3 — large-scale AP-MS; MTX1 interactions identified but not specifically validated","pmids":["26186194"],"is_preprint":false},{"year":2022,"finding":"OpenCell endogenous tagging project determined the subcellular localization of MTX1 by live-cell confocal imaging of endogenously tagged protein, confirming mitochondrial localization and enabling identification of proximity interactors consistent with outer membrane complex membership.","method":"CRISPR-based endogenous tagging, confocal live-cell imaging, affinity purification mass spectrometry","journal":"Science","confidence":"Medium","confidence_rationale":"Tier 2 — endogenous tagging with direct imaging provides high-confidence localization data","pmids":["35271311"],"is_preprint":false}],"current_model":"MTX1 (Metaxin 1) is a mitochondrial outer membrane protein anchored via its C-terminal transmembrane domain with its N-terminus exposed to the cytosol, where it functions as a component of the mammalian preprotein import machinery, participating in the biogenesis of beta-barrel proteins (VDAC, Tom40) in conjunction with Sam50 and metaxin 2, and assembles into the large MIB (mitochondrial intermembrane space bridging) supercomplex that also contains mitofilin/MINOS, SAM50, MTX2, MTX3, CHCHD3/6, and DnaJC11; additionally, MTX1 has been found to promote autophagy by interacting with and inhibiting the autophagy suppressor CISD1, contributing to sorafenib resistance in hepatocellular carcinoma."},"narrative":{"teleology":[{"year":1996,"claim":"Determining the genomic organization of MTX1 established its gene structure (eight exons, 317-amino-acid product) and revealed its convergent transcription with THBS3 and co-duplication with GBA, providing the foundation for all subsequent functional studies.","evidence":"Genomic sequencing, exon mapping, and Northern blot in human tissues","pmids":["8660965"],"confidence":"High","gaps":["No functional data on the encoded protein at this stage","Pseudogene (psMTX) function unknown"]},{"year":1997,"claim":"Establishing that MTX1 is a mitochondrial outer membrane protein with a cytosol-exposed N-terminus that participates in preprotein import answered the fundamental question of where and how metaxin-1 functions, distinguishing it from its yeast homolog Tom37.","evidence":"Immunofluorescence in COS cells, protease protection on intact mitochondria, anti-metaxin antibody inhibition of preadrenodoxin import in vitro, C-terminal truncation mutagenesis","pmids":["9045676"],"confidence":"High","gaps":["Only one substrate (preadrenodoxin) tested; specificity for beta-barrel vs. matrix-targeted precursors not resolved","Antibody inhibition is indirect — does not prove a direct receptor role"]},{"year":2005,"claim":"Linking MTX1-containing complexes to the SAM-dependent assembly pathway for Tom40 narrowed MTX1's import role to beta-barrel protein biogenesis rather than general matrix import.","evidence":"In vitro import of radiolabeled Tom40, blue native PAGE intermediate analysis, Sam50 RNAi in human cells","pmids":["15644312"],"confidence":"Medium","gaps":["MTX1's role inferred from complex membership rather than direct depletion of MTX1 itself","Structural basis for MTX1 participation in SAM complex not determined"]},{"year":2007,"claim":"Functional RNAi experiments and immunocapture proteomics independently established that MTX1, metaxin-2, and SAM50 are interdependent components of a membrane-bridging complex (with mitofilin, CHCHD3/6, DnaJC11) required specifically for beta-barrel protein assembly, resolving the substrate specificity question.","evidence":"Metaxin-2 and Sam50 RNAi with radiolabeled VDAC/Tom40 import assays; anti-mitofilin immunocapture followed by mass spectrometry","pmids":["17510655","17624330"],"confidence":"High","gaps":["Direct MTX1 depletion effects on import not shown (only metaxin-2 and Sam50 depleted)","Stoichiometry and subunit contacts within the complex undefined"]},{"year":2015,"claim":"Complexome profiling resolved MTX1's position within the MIB supercomplex hierarchy, showing it associates specifically with the fully assembled MIB (form C) rather than intermediate subcomplexes, clarifying its late-stage assembly role.","evidence":"Mitochondrial protein complexome profiling with blue native PAGE and evolutionary distribution analysis","pmids":["26477565"],"confidence":"Medium","gaps":["Functional consequence of MTX1 absence from intermediate subcomplexes not tested","No reconstitution of MIB assembly in vitro"]},{"year":2017,"claim":"Identification of MTX1 as a cargo of LC3C/p62-dependent piecemeal mitophagy revealed that the outer membrane import machinery itself is subject to selective autophagic quality control, expanding MTX1's biology beyond import.","evidence":"BioID proximity labeling on autophagosomal markers combined with quantitative proteomics","pmids":["29149599"],"confidence":"Medium","gaps":["Whether MTX1 degradation by piecemeal mitophagy has functional consequences for import capacity is untested","Signals targeting MTX1 for autophagic degradation not identified"]},{"year":2021,"claim":"A CRISPRa screen and follow-up experiments demonstrated a gain-of-function role for MTX1 in promoting autophagy through inhibition of CISD1, providing a mechanism for sorafenib resistance in hepatocellular carcinoma and revealing a non-import function for MTX1.","evidence":"Genome-scale CRISPRa screen, overexpression/knockdown in HCC cells, xenograft models, co-immunoprecipitation of MTX1-CISD1, autophagy flux assays","pmids":["34421355"],"confidence":"Medium","gaps":["MTX1-CISD1 interaction demonstrated by single co-immunoprecipitation without reciprocal validation or domain mapping","Whether this autophagy-promoting role operates in non-cancer contexts is unknown","Mechanism by which MTX1 binding inhibits CISD1 function not defined"]},{"year":null,"claim":"Key unresolved questions include the direct structural contacts of MTX1 within the MIB/SAM complex, the phenotypic consequences of direct MTX1 loss-of-function on mitochondrial import in vivo, and whether MTX1's import and autophagy-related functions are mechanistically coupled.","evidence":"","pmids":[],"confidence":"Low","gaps":["No structure of MTX1 or its interfaces with SAM50/MTX2","No MTX1 knockout or conditional KO phenotype in animal models reported in this timeline","Relationship between import function and CISD1-mediated autophagy promotion unexplored"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,4,5]}],"localization":[{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[0,3,4,9,14]}],"pathway":[{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[10,12]},{"term_id":"R-HSA-9609507","term_label":"Protein localization","supporting_discovery_ids":[0,4,5]},{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[3,7]}],"complexes":["MIB (mitochondrial intermembrane space bridging) complex","SAM complex"],"partners":["SAM50","MTX2","MTX3","CHCHD3","CHCHD6","DNAJC11","CISD1"],"other_free_text":[]},"mechanistic_narrative":"MTX1 (Metaxin-1) is a mitochondrial outer membrane protein that functions as a component of the protein import and assembly machinery for beta-barrel proteins such as VDAC and Tom40, operating in concert with SAM50 and metaxin-2 [PMID:9045676, PMID:17510655]. MTX1 is anchored via a C-terminal transmembrane domain with its N-terminus facing the cytosol, and it assembles into the MIB (mitochondrial intermembrane space bridging) supercomplex that bridges the outer and inner mitochondrial membranes alongside MICOS subunits, SAM50, MTX2, MTX3, CHCHD3/6, and DnaJC11 [PMID:17624330, PMID:26477565]. MTX1 is a substrate of LC3C/p62-dependent piecemeal mitophagy, linking it to mitochondrial quality control [PMID:29149599]. MTX1 overexpression promotes autophagy by interacting with and inhibiting the autophagy suppressor CISD1, contributing to sorafenib resistance in hepatocellular carcinoma [PMID:34421355]."},"prefetch_data":{"uniprot":{"accession":"Q13505","full_name":"Metaxin-1","aliases":["Mitochondrial outer membrane import complex protein 1"],"length_aa":466,"mass_kda":51.5,"function":"Involved in transport of proteins into the mitochondrion. Essential for embryonic development (By similarity)","subcellular_location":"Membrane; Mitochondrion outer membrane","url":"https://www.uniprot.org/uniprotkb/Q13505/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/MTX1","classification":"Not Classified","n_dependent_lines":3,"n_total_lines":1208,"dependency_fraction":0.0024834437086092716},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"DNAJC11","stoichiometry":10.0}],"url":"https://opencell.sf.czbiohub.org/search/MTX1","total_profiled":1310},"omim":[{"mim_id":"615634","title":"COILED-COIL-HELIX-COILED-COIL-HELIX DOMAIN-CONTAINING PROTEIN 6; CHCHD6","url":"https://www.omim.org/entry/615634"},{"mim_id":"613748","title":"COILED-COIL-HELIX-COILED-COIL-HELIX DOMAIN-CONTAINING PROTEIN 3; CHCHD3","url":"https://www.omim.org/entry/613748"},{"mim_id":"612058","title":"SAMM50 SORTING AND ASSEMBLY MACHINERY COMPONENT; 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terminus. The gene is 6 kb, consists of eight protein-encoding exons, and is contiguous to THBS3 (sharing a common promoter region) and the glucocerebrosidase pseudogene (psGBA). A pseudogene for metaxin (psMTX) was also identified within the genomic locus.\",\n      \"method\": \"cDNA sequencing, genomic cloning, and structural analysis of the human MTX1 gene and pseudogene\",\n      \"journal\": \"Genomics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct genomic and cDNA sequencing with structural characterization of the gene and encoded protein\",\n      \"pmids\": [\"8660965\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"The MTX1 c.184T>A (p.S63T) variant is found at high frequency in GBA mutation carriers and the homozygous MTX1 c.184A/A genotype is associated with significantly earlier age of motor symptom onset (5.1–5.9 years younger) in GBA-associated Parkinson's disease patients, suggesting that MTX1 sequence variation on the trans allele modifies the clinical course of GBA-associated PD.\",\n      \"method\": \"Sequencing of the entire MTX1 coding region and exon-intron boundaries in PD patient cohorts; genotyping with statistical association analysis\",\n      \"journal\": \"Neurogenetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct sequencing across two cohorts with statistical replication, but purely genetic association without in vitro mechanistic follow-up\",\n      \"pmids\": [\"21837367\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"MTX1 (Metaxin 1) promotes sorafenib resistance in hepatocellular carcinoma (HCC) by augmenting autophagy. Mechanistically, overexpression of MTX1 was shown to interact with and inhibit CDGSH iron sulfur domain 1 (CISD1), an autophagy negative regulator, thereby promoting autophagy. MTX1 overexpression increased HCC cell proliferation and decreased apoptosis upon sorafenib treatment both in vitro and in subcutaneous xenograft models.\",\n      \"method\": \"Genome-scale CRISPRa screening, co-immunoprecipitation (interaction with CISD1), MTX1 overexpression/knockdown with sorafenib treatment, xenograft tumor models, autophagy assays\",\n      \"journal\": \"International journal of biological sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — CRISPRa screen plus Co-IP and functional rescue in vivo, single lab study\",\n      \"pmids\": [\"34421355\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"MTX1 (Metaxin 1) encodes a mitochondrial outer membrane protein (317 aa, with a C-terminal transmembrane domain, no N-terminal signal sequence) whose gene is co-regulated with THBS3; it modifies the age of onset of GBA-associated Parkinson's disease via a trans-allele effect, and promotes sorafenib resistance in hepatocellular carcinoma by interacting with and inhibiting the autophagy regulator CISD1 to augment autophagy.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\nI'll systematically classify each paper as KEEP or EXCLUDE, then extract mechanistic discoveries only from KEPT papers.\n\n**Classification:**\n- Papers [1]-[100] from retrieved corpus: Most are about HT29-MTX cells (a cell line), methotrexate (the drug), MTX1 (muscarinic toxin), Mtx (mosquitocidal toxin), MTX-13 (ADC), etc. — these are ALIAS COLLISIONS or unrelated uses of \"MTX.\"\n- Paper [100-corpus/27]: \"Structure and organization of the human metaxin gene (MTX)\" — KEEP (canonical MTX1/Metaxin 1)\n- Paper [100-corpus/78]: \"Homozygosity for the MTX1 c.184T>A...\" — KEEP (canonical MTX1)\n- Paper [100-corpus/96]: \"Genome-scale CRISPRa screening identifies MTX1 as a contributor for sorafenib resistance\" — KEEP (canonical MTX1)\n\n**From gene2pubmed curated papers:**\n- PMID 9045676: Metaxin is component of preprotein import complex — KEEP\n- PMID 17624330: Mitofilin complex with metaxins 1 and 2 — KEEP\n- PMID 15644312: Tom40 import pathway, human SAM — KEEP (mentions metaxin context)\n- PMID 17510655: Sam50 and metaxins in VDAC biogenesis — KEEP\n- PMID 26477565: MICOS/MIB complex includes MTX1 — KEEP\n- PMID 27499296: Mitochondrial protein interaction mapping — KEEP\n- PMID 32877691: High-density mitochondrial proximity interaction network — KEEP\n- PMID 34079125: BioID map of human cell — KEEP\n- PMID 33961781: BioPlex 3.0 — KEEP (MTX1 interactions)\n- PMID 26186194: BioPlex network — KEEP\n- PMID 28514442: BioPlex 2.0 — KEEP\n- PMID 17353931: Large-scale mapping human PPI — KEEP\n- PMID 22939629: Census of human soluble protein complexes — KEEP\n- PMID 34800366: Human mitochondrial proteome — KEEP\n- PMID 35271311: OpenCell — KEEP\n- PMID 9331372: Genes contiguous to GBA locus — KEEP\n- PMID 8660965: Structure of human MTX gene — KEEP (same as corpus/27)\n- PMID 21837367: MTX1 c.184T>A in PD — KEEP\n- PMID 29149599: LC3C-dependent piecemeal mitophagy — KEEP (MTX1 context)\n- PMID 22114354: MINOS1/mitofilin complexes — KEEP\n- Other large-scale genomics/evolution papers: partial relevance; extract only if direct MTX1 finding.\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1997,\n      \"finding\": \"Metaxin 1 (MTX1) is a mitochondrial outer membrane protein anchored via a C-terminal transmembrane domain with its N-terminal region exposed to the cytosol. Anti-metaxin antibodies partially inhibited import of radiolabeled preadrenodoxin into mitochondria, establishing MTX1 as a component of the mitochondrial preprotein import machinery of the outer membrane. MTX1 shows sequence similarity to yeast Tom37 but with distinct targeting mechanisms.\",\n      \"method\": \"Immunofluorescence localization in COS cells, protease protection assay on intact mitochondria, antibody inhibition of in vitro protein import, C-terminal truncation mutagenesis\",\n      \"journal\": \"The Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal methods (localization, import inhibition, mutagenesis) in single rigorous study\",\n      \"pmids\": [\"9045676\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"The human MTX1 gene spans 6 kb with eight protein-coding exons and encodes a 317-amino acid protein (91.5% identical to mouse metaxin). MTX1 is contiguous to THBS3 (sharing a common promoter, transcribed convergently) and adjacent to the glucocerebrosidase pseudogene (psGBA). The predicted protein lacks an N-terminal signal sequence but contains a putative C-terminal transmembrane domain. A pseudogene (psMTX) was identified within the GBA/psGBA region, containing a 278-amino acid ORF 97.8% identical to metaxin but lacking the first intron and promoter and not expressed in liver.\",\n      \"method\": \"Genomic sequencing, exon mapping, Northern blotting, sequence analysis\",\n      \"journal\": \"Genomics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — comprehensive genomic characterization with expression validation\",\n      \"pmids\": [\"8660965\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"MTX1 (metaxin) was identified immediately downstream of the glucocerebrosidase pseudogene (psGBA) on chromosome 1q21. The genomic organization of the 75-kb region revealed that the duplication giving rise to psGBA also produced a pseudogene for MTX1, establishing MTX1's chromosomal context and its co-duplication with GBA.\",\n      \"method\": \"Genomic sequencing, restriction mapping, gene identification\",\n      \"journal\": \"Genome Research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genomic characterization, single study\",\n      \"pmids\": [\"9331372\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"MTX1 (metaxin 1) exists in a high-molecular-weight complex with mitofilin (inner membrane), metaxin 2, SAM50, CHCHD3, CHCHD6, and DnaJC11, as revealed by immunocapture with an anti-mitofilin monoclonal antibody followed by mass spectrometry. This complex bridges the inner and outer mitochondrial membranes and likely functions in protein import and maintenance of mitochondrial structure.\",\n      \"method\": \"Monoclonal antibody immunocapture, SDS-PAGE, mass spectrometry identification of co-purifying proteins\",\n      \"journal\": \"FEBS Letters\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal co-purification with MS identification, multiple subunits identified\",\n      \"pmids\": [\"17624330\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Depletion of metaxin 2 by RNAi caused reduction of metaxin 1 (MTX1) steady-state levels and deficient import and assembly of VDAC and Tom40 (but not matrix-targeted precursors), placing MTX1 in the pathway of beta-barrel protein biogenesis at the mitochondrial outer membrane. Reduction of Sam50 also led to decreased levels of both metaxin 1 and metaxin 2, indicating interdependence among Sam50, MTX1, and metaxin 2.\",\n      \"method\": \"RNAi knockdown, in vitro mitochondrial import assay with radiolabeled precursors, immunoblotting for steady-state levels\",\n      \"journal\": \"EMBO Reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — functional import assays with RNAi and radiolabeled substrates, multiple targets tested\",\n      \"pmids\": [\"17510655\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Human Tom40 import involves the TOM complex as a first stable intermediate on the outer face, followed by membrane integration; metaxins (including MTX1) constitute part of the mammalian SAM complex through which Tom40 assembly is routed. Depletion of human Sam50 reduces Tom40 assembly, linking MTX1-containing complexes to the beta-barrel assembly pathway.\",\n      \"method\": \"In vitro import assay with radiolabeled Tom40 precursor, blue native PAGE to detect import intermediates, RNAi depletion of Sam50\",\n      \"journal\": \"The Journal of Biological Chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vitro import assays with intermediate characterization; MTX1 role inferred from complex membership\",\n      \"pmids\": [\"15644312\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"MTX1 (metaxin 1) was identified as a component of mitofilin/MINOS complexes in human mitochondria by proteomic analyses. Disruption of MINOS1 affects mitochondrial morphology and inner membrane organization, and MTX1-containing complexes bridge inner and outer membranes.\",\n      \"method\": \"Co-immunoprecipitation, mass spectrometry proteomics of mitofilin complexes, electron microscopy of mitochondrial ultrastructure\",\n      \"journal\": \"Molecular Biology of the Cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — proteomic identification of complex membership, single study\",\n      \"pmids\": [\"22114354\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Systematic analysis of the MICOS/MIB complex revealed that MTX1 is a component of the complete MIB (mitochondrial intermembrane space bridging) complex (form C), which also contains all MICOS proteins, SAMM50, MTX2, MTX3, and DNAJC11. MTX1 is distinguished from MTX2 and MTX3 in that it associates specifically with the fully assembled MIB complex rather than the membrane-bridging subcomplex.\",\n      \"method\": \"Mitochondrial protein complexome profiling, blue native PAGE, evolutionary distribution analysis across species\",\n      \"journal\": \"Biochimica et Biophysica Acta\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — complexome profiling with subcomplex resolution; MTX1-specific localization within MIB defined\",\n      \"pmids\": [\"26477565\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Affinity enrichment mass spectrometry of 50 mitochondrial proteins identified MTX1 as part of the mitochondrial interactome, confirming its association with the outer membrane import and assembly machinery. MTX1 interactions were catalogued as part of a network connecting diverse mitochondrial processes including respiratory chain function.\",\n      \"method\": \"Affinity enrichment mass spectrometry (AP-MS) of 50 mitochondrial bait proteins\",\n      \"journal\": \"Molecular Cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — large-scale systematic AP-MS; MTX1 interactions part of broader network\",\n      \"pmids\": [\"27499296\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"BioID proximity labeling using 100 mitochondrial baits (including outer membrane markers) identified MTX1 proximity interactions in the human mitochondrial outer membrane neighborhood. MTX1 showed proximity to proteins at the interface between the mitochondrial outer membrane and the endoplasmic reticulum, relevant to mitochondrial homeostasis.\",\n      \"method\": \"BioID proximity-dependent biotinylation with 100 mitochondrial bait proteins, mass spectrometry\",\n      \"journal\": \"Cell Metabolism\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — systematic BioID across mitochondrial compartments; proximity interactions defined\",\n      \"pmids\": [\"32877691\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"LC3C- and p62-dependent piecemeal mitophagy involves the autophagic degradation of individual mitochondrial proteins including components of the outer membrane. Autophagosomal content profiling identified MTX1 among mitochondrial outer membrane proteins subject to selective autophagic degradation, implicating MTX1 in mitochondrial quality control via piecemeal mitophagy.\",\n      \"method\": \"Proximity labeling (BioID on autophagosomal markers) combined with quantitative proteomics to profile autophagosome contents\",\n      \"journal\": \"Molecular Cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — proximity labeling proteomics of autophagosomes; MTX1 identified as substrate\",\n      \"pmids\": [\"29149599\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"The MTX1 c.184T>A (p.S63T) variant was found in 93% of GBA mutation carriers (PD patients and healthy controls) versus 64% of non-carriers (p=0.0008). Homozygosity for the MTX1 c.184A/A genotype was associated with significantly earlier age of motor symptom onset in GBA-associated Parkinson's disease patients (5.1–5.9 years younger, p=0.002–0.01), and higher frequency of early-onset PD (<50 years) in GBA+MTX1 homozygous carriers (35.9% vs 13.6–17.5%, p=0.028). The c.184A allele is in strong linkage disequilibrium with the GBA p.N370S mutation.\",\n      \"method\": \"Sequencing of entire MTX1 coding region and exon-intron boundaries in 81 PD-GBA carriers and controls; population genotyping of 600 PD patients and 353 controls; statistical association analysis\",\n      \"journal\": \"Neurogenetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — genetic association with functional implication (MTX1 variant modifies disease onset), single study, no direct mechanistic experiment\",\n      \"pmids\": [\"21837367\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Genome-scale CRISPRa screening identified MTX1 (Metaxin 1) as a contributor to sorafenib resistance in hepatocellular carcinoma (HCC). MTX1 overexpression promoted HCC cell proliferation in vitro and in vivo, decreased apoptosis upon sorafenib treatment, and enhanced autophagy. Mechanistically, MTX1 overexpression promoted autophagy by interacting with and inhibiting CISD1 (CDGSH iron sulfur domain 1, an autophagy negative regulator), as shown by co-immunoprecipitation.\",\n      \"method\": \"Genome-scale CRISPRa screen, overexpression and knockdown experiments, subcutaneous xenograft models, co-immunoprecipitation (MTX1-CISD1 interaction), autophagy flux assays\",\n      \"journal\": \"International Journal of Biological Sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — CRISPRa screen validated by OE/KD with xenograft and Co-IP; mechanistic link to CISD1 shown by single Co-IP\",\n      \"pmids\": [\"34421355\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"High-throughput AP-MS (BioPlex network) identified MTX1 protein-protein interactions in HEK293T cells, placing MTX1 within a network community consistent with its mitochondrial outer membrane function and import complex role.\",\n      \"method\": \"Affinity purification mass spectrometry (AP-MS) of 2,594 human proteins in HEK293T cells\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — large-scale AP-MS; MTX1 interactions identified but not specifically validated\",\n      \"pmids\": [\"26186194\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"OpenCell endogenous tagging project determined the subcellular localization of MTX1 by live-cell confocal imaging of endogenously tagged protein, confirming mitochondrial localization and enabling identification of proximity interactors consistent with outer membrane complex membership.\",\n      \"method\": \"CRISPR-based endogenous tagging, confocal live-cell imaging, affinity purification mass spectrometry\",\n      \"journal\": \"Science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — endogenous tagging with direct imaging provides high-confidence localization data\",\n      \"pmids\": [\"35271311\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"MTX1 (Metaxin 1) is a mitochondrial outer membrane protein anchored via its C-terminal transmembrane domain with its N-terminus exposed to the cytosol, where it functions as a component of the mammalian preprotein import machinery, participating in the biogenesis of beta-barrel proteins (VDAC, Tom40) in conjunction with Sam50 and metaxin 2, and assembles into the large MIB (mitochondrial intermembrane space bridging) supercomplex that also contains mitofilin/MINOS, SAM50, MTX2, MTX3, CHCHD3/6, and DnaJC11; additionally, MTX1 has been found to promote autophagy by interacting with and inhibiting the autophagy suppressor CISD1, contributing to sorafenib resistance in hepatocellular carcinoma.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"MTX1 encodes a 317-amino-acid mitochondrial outer membrane protein that lacks an N-terminal signal sequence and anchors via a C-terminal transmembrane domain; its gene is contiguous with THBS3, sharing a common promoter region [PMID:8660965]. MTX1 interacts with and inhibits CISD1, a negative regulator of autophagy, thereby augmenting autophagic flux; this mechanism promotes sorafenib resistance in hepatocellular carcinoma by increasing cell proliferation and decreasing apoptosis under drug treatment [PMID:34421355]. The MTX1 p.S63T variant on the trans allele modifies the age of motor symptom onset in GBA-associated Parkinson's disease, with homozygous carriers presenting approximately 5 years earlier [PMID:21837367].\",\n  \"teleology\": [\n    {\n      \"year\": 1996,\n      \"claim\": \"Cloning of the MTX1 gene established its genomic architecture (eight exons, 6 kb), the encoded protein's mitochondrial identity with a C-terminal transmembrane anchor, and its tandem arrangement with THBS3 and the GBA pseudogene locus — providing the foundation for all subsequent functional and genetic studies.\",\n      \"evidence\": \"cDNA sequencing, genomic cloning, and structural analysis in human samples\",\n      \"pmids\": [\"8660965\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No biochemical activity or binding partners identified at this stage\",\n        \"Mechanism of mitochondrial outer membrane targeting without an N-terminal signal sequence was not resolved\",\n        \"Functional significance of co-regulation with THBS3 was not explored\"\n      ]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Genetic association established that the MTX1 p.S63T variant modifies age of onset in GBA-associated Parkinson's disease through a trans-allele effect, linking MTX1 variation to neurodegenerative disease for the first time.\",\n      \"evidence\": \"Direct sequencing and genotyping across two GBA-PD patient cohorts with statistical association analysis\",\n      \"pmids\": [\"21837367\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Purely genetic association without biochemical or cellular mechanistic follow-up\",\n        \"Effect of the S63T substitution on MTX1 protein function or stability is unknown\",\n        \"Not replicated in independent large-scale GWAS or multi-ethnic cohorts\"\n      ]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Functional studies revealed that MTX1 directly interacts with and inhibits CISD1 to promote autophagy, establishing its first defined molecular mechanism and linking it to drug resistance in hepatocellular carcinoma.\",\n      \"evidence\": \"Genome-scale CRISPRa screen, co-immunoprecipitation, overexpression/knockdown studies with sorafenib, and xenograft tumor models\",\n      \"pmids\": [\"34421355\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Single-lab study; MTX1–CISD1 interaction awaits reciprocal validation and structural characterization\",\n        \"Whether the autophagy-promoting function operates in non-cancer contexts (e.g., neurons) is untested\",\n        \"How MTX1 inhibits CISD1 at the molecular level (direct binding site, stoichiometry) is undefined\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The structural basis of MTX1's mitochondrial outer membrane insertion without a signal sequence, the molecular consequence of the PD-associated S63T variant, and whether MTX1's autophagy-regulatory role through CISD1 is relevant to neurodegeneration all remain open questions.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No structural model of MTX1 exists\",\n        \"Connection between CISD1-mediated autophagy regulation and GBA-PD modifier effect has not been tested\",\n        \"Endogenous protein complexes of MTX1 at the mitochondrial outer membrane are not comprehensively characterized\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [2]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [0, 2]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [2]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"CISD1\"],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"MTX1 (Metaxin-1) is a mitochondrial outer membrane protein that functions as a component of the protein import and assembly machinery for beta-barrel proteins such as VDAC and Tom40, operating in concert with SAM50 and metaxin-2 [PMID:9045676, PMID:17510655]. MTX1 is anchored via a C-terminal transmembrane domain with its N-terminus facing the cytosol, and it assembles into the MIB (mitochondrial intermembrane space bridging) supercomplex that bridges the outer and inner mitochondrial membranes alongside MICOS subunits, SAM50, MTX2, MTX3, CHCHD3/6, and DnaJC11 [PMID:17624330, PMID:26477565]. MTX1 is a substrate of LC3C/p62-dependent piecemeal mitophagy, linking it to mitochondrial quality control [PMID:29149599]. MTX1 overexpression promotes autophagy by interacting with and inhibiting the autophagy suppressor CISD1, contributing to sorafenib resistance in hepatocellular carcinoma [PMID:34421355].\",\n  \"teleology\": [\n    {\n      \"year\": 1996,\n      \"claim\": \"Determining the genomic organization of MTX1 established its gene structure (eight exons, 317-amino-acid product) and revealed its convergent transcription with THBS3 and co-duplication with GBA, providing the foundation for all subsequent functional studies.\",\n      \"evidence\": \"Genomic sequencing, exon mapping, and Northern blot in human tissues\",\n      \"pmids\": [\"8660965\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No functional data on the encoded protein at this stage\", \"Pseudogene (psMTX) function unknown\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Establishing that MTX1 is a mitochondrial outer membrane protein with a cytosol-exposed N-terminus that participates in preprotein import answered the fundamental question of where and how metaxin-1 functions, distinguishing it from its yeast homolog Tom37.\",\n      \"evidence\": \"Immunofluorescence in COS cells, protease protection on intact mitochondria, anti-metaxin antibody inhibition of preadrenodoxin import in vitro, C-terminal truncation mutagenesis\",\n      \"pmids\": [\"9045676\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Only one substrate (preadrenodoxin) tested; specificity for beta-barrel vs. matrix-targeted precursors not resolved\", \"Antibody inhibition is indirect — does not prove a direct receptor role\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Linking MTX1-containing complexes to the SAM-dependent assembly pathway for Tom40 narrowed MTX1's import role to beta-barrel protein biogenesis rather than general matrix import.\",\n      \"evidence\": \"In vitro import of radiolabeled Tom40, blue native PAGE intermediate analysis, Sam50 RNAi in human cells\",\n      \"pmids\": [\"15644312\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"MTX1's role inferred from complex membership rather than direct depletion of MTX1 itself\", \"Structural basis for MTX1 participation in SAM complex not determined\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Functional RNAi experiments and immunocapture proteomics independently established that MTX1, metaxin-2, and SAM50 are interdependent components of a membrane-bridging complex (with mitofilin, CHCHD3/6, DnaJC11) required specifically for beta-barrel protein assembly, resolving the substrate specificity question.\",\n      \"evidence\": \"Metaxin-2 and Sam50 RNAi with radiolabeled VDAC/Tom40 import assays; anti-mitofilin immunocapture followed by mass spectrometry\",\n      \"pmids\": [\"17510655\", \"17624330\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct MTX1 depletion effects on import not shown (only metaxin-2 and Sam50 depleted)\", \"Stoichiometry and subunit contacts within the complex undefined\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Complexome profiling resolved MTX1's position within the MIB supercomplex hierarchy, showing it associates specifically with the fully assembled MIB (form C) rather than intermediate subcomplexes, clarifying its late-stage assembly role.\",\n      \"evidence\": \"Mitochondrial protein complexome profiling with blue native PAGE and evolutionary distribution analysis\",\n      \"pmids\": [\"26477565\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of MTX1 absence from intermediate subcomplexes not tested\", \"No reconstitution of MIB assembly in vitro\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Identification of MTX1 as a cargo of LC3C/p62-dependent piecemeal mitophagy revealed that the outer membrane import machinery itself is subject to selective autophagic quality control, expanding MTX1's biology beyond import.\",\n      \"evidence\": \"BioID proximity labeling on autophagosomal markers combined with quantitative proteomics\",\n      \"pmids\": [\"29149599\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether MTX1 degradation by piecemeal mitophagy has functional consequences for import capacity is untested\", \"Signals targeting MTX1 for autophagic degradation not identified\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"A CRISPRa screen and follow-up experiments demonstrated a gain-of-function role for MTX1 in promoting autophagy through inhibition of CISD1, providing a mechanism for sorafenib resistance in hepatocellular carcinoma and revealing a non-import function for MTX1.\",\n      \"evidence\": \"Genome-scale CRISPRa screen, overexpression/knockdown in HCC cells, xenograft models, co-immunoprecipitation of MTX1-CISD1, autophagy flux assays\",\n      \"pmids\": [\"34421355\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"MTX1-CISD1 interaction demonstrated by single co-immunoprecipitation without reciprocal validation or domain mapping\", \"Whether this autophagy-promoting role operates in non-cancer contexts is unknown\", \"Mechanism by which MTX1 binding inhibits CISD1 function not defined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the direct structural contacts of MTX1 within the MIB/SAM complex, the phenotypic consequences of direct MTX1 loss-of-function on mitochondrial import in vivo, and whether MTX1's import and autophagy-related functions are mechanistically coupled.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No structure of MTX1 or its interfaces with SAM50/MTX2\", \"No MTX1 knockout or conditional KO phenotype in animal models reported in this timeline\", \"Relationship between import function and CISD1-mediated autophagy promotion unexplored\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 4, 5]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [0, 3, 4, 9, 14]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0009536\", \"supporting_discovery_ids\": []},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [10, 12]},\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [0, 4, 5]},\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [3, 7]}\n    ],\n    \"complexes\": [\n      \"MIB (mitochondrial intermembrane space bridging) complex\",\n      \"SAM complex\"\n    ],\n    \"partners\": [\n      \"SAM50\",\n      \"MTX2\",\n      \"MTX3\",\n      \"CHCHD3\",\n      \"CHCHD6\",\n      \"DNAJC11\",\n      \"CISD1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```\n\nWait, I need to fix the pathway section — I accidentally included GO:0009536 (plastid) with empty supporting_discovery_ids, which violates the rules. Let me correct:\n\n```json\n{\n  \"mechanistic_narrative\": \"MTX1 (Metaxin-1) is a mitochondrial outer membrane protein that functions as a component of the protein import and assembly machinery for beta-barrel proteins such as VDAC and Tom40, operating in concert with SAM50 and metaxin-2 [PMID:9045676, PMID:17510655]. MTX1 is anchored via a C-terminal transmembrane domain with its N-terminus facing the cytosol, and it assembles into the MIB (mitochondrial intermembrane space bridging) supercomplex that bridges the outer and inner mitochondrial membranes alongside MICOS subunits, SAM50, MTX2, MTX3, CHCHD3/6, and DnaJC11 [PMID:17624330, PMID:26477565]. MTX1 is a substrate of LC3C/p62-dependent piecemeal mitophagy, linking it to mitochondrial quality control [PMID:29149599]. MTX1 overexpression promotes autophagy by interacting with and inhibiting the autophagy suppressor CISD1, contributing to sorafenib resistance in hepatocellular carcinoma [PMID:34421355].\",\n  \"teleology\": [\n    {\n      \"year\": 1996,\n      \"claim\": \"Determining the genomic organization of MTX1 established its gene structure (eight exons, 317-amino-acid product) and revealed its convergent transcription with THBS3 and co-duplication with GBA, providing the foundation for all subsequent functional studies.\",\n      \"evidence\": \"Genomic sequencing, exon mapping, and Northern blot in human tissues\",\n      \"pmids\": [\"8660965\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No functional data on the encoded protein at this stage\", \"Pseudogene (psMTX) function unknown\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Establishing that MTX1 is a mitochondrial outer membrane protein with a cytosol-exposed N-terminus that participates in preprotein import answered the fundamental question of where and how metaxin-1 functions, distinguishing it from its yeast homolog Tom37.\",\n      \"evidence\": \"Immunofluorescence in COS cells, protease protection on intact mitochondria, anti-metaxin antibody inhibition of preadrenodoxin import in vitro, C-terminal truncation mutagenesis\",\n      \"pmids\": [\"9045676\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Only one substrate (preadrenodoxin) tested; specificity for beta-barrel vs. matrix-targeted precursors not resolved\", \"Antibody inhibition is indirect — does not prove a direct receptor role\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Linking MTX1-containing complexes to the SAM-dependent assembly pathway for Tom40 narrowed MTX1's import role to beta-barrel protein biogenesis rather than general matrix import.\",\n      \"evidence\": \"In vitro import of radiolabeled Tom40, blue native PAGE intermediate analysis, Sam50 RNAi in human cells\",\n      \"pmids\": [\"15644312\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"MTX1's role inferred from complex membership rather than direct depletion of MTX1 itself\", \"Structural basis for MTX1 participation in SAM complex not determined\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Functional RNAi experiments and immunocapture proteomics independently established that MTX1, metaxin-2, and SAM50 are interdependent components of a membrane-bridging complex (with mitofilin, CHCHD3/6, DnaJC11) required specifically for beta-barrel protein assembly, resolving the substrate specificity question.\",\n      \"evidence\": \"Metaxin-2 and Sam50 RNAi with radiolabeled VDAC/Tom40 import assays; anti-mitofilin immunocapture followed by mass spectrometry\",\n      \"pmids\": [\"17510655\", \"17624330\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct MTX1 depletion effects on import not shown (only metaxin-2 and Sam50 depleted)\", \"Stoichiometry and subunit contacts within the complex undefined\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Complexome profiling resolved MTX1's position within the MIB supercomplex hierarchy, showing it associates specifically with the fully assembled MIB (form C) rather than intermediate subcomplexes, clarifying its late-stage assembly role.\",\n      \"evidence\": \"Mitochondrial protein complexome profiling with blue native PAGE and evolutionary distribution analysis\",\n      \"pmids\": [\"26477565\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of MTX1 absence from intermediate subcomplexes not tested\", \"No reconstitution of MIB assembly in vitro\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Identification of MTX1 as a cargo of LC3C/p62-dependent piecemeal mitophagy revealed that the outer membrane import machinery itself is subject to selective autophagic quality control, expanding MTX1's biology beyond import.\",\n      \"evidence\": \"BioID proximity labeling on autophagosomal markers combined with quantitative proteomics\",\n      \"pmids\": [\"29149599\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether MTX1 degradation by piecemeal mitophagy has functional consequences for import capacity is untested\", \"Signals targeting MTX1 for autophagic degradation not identified\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"A CRISPRa screen and follow-up experiments demonstrated a gain-of-function role for MTX1 in promoting autophagy through inhibition of CISD1, providing a mechanism for sorafenib resistance in hepatocellular carcinoma and revealing a non-import function for MTX1.\",\n      \"evidence\": \"Genome-scale CRISPRa screen, overexpression/knockdown in HCC cells, xenograft models, co-immunoprecipitation of MTX1-CISD1, autophagy flux assays\",\n      \"pmids\": [\"34421355\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"MTX1-CISD1 interaction demonstrated by single co-immunoprecipitation without reciprocal validation or domain mapping\", \"Whether this autophagy-promoting role operates in non-cancer contexts is unknown\", \"Mechanism by which MTX1 binding inhibits CISD1 function not defined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the direct structural contacts of MTX1 within the MIB/SAM complex, the phenotypic consequences of direct MTX1 loss-of-function on mitochondrial import in vivo, and whether MTX1's import and autophagy-related functions are mechanistically coupled.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No structure of MTX1 or its interfaces with SAM50/MTX2\", \"No MTX1 knockout or conditional KO phenotype in animal models reported in this timeline\", \"Relationship between import function and CISD1-mediated autophagy promotion unexplored\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 4, 5]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [0, 3, 4, 9, 14]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [10, 12]},\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [0, 4, 5]},\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [3, 7]}\n    ],\n    \"complexes\": [\n      \"MIB (mitochondrial intermembrane space bridging) complex\",\n      \"SAM complex\"\n    ],\n    \"partners\": [\n      \"SAM50\",\n      \"MTX2\",\n      \"MTX3\",\n      \"CHCHD3\",\n      \"CHCHD6\",\n      \"DNAJC11\",\n      \"CISD1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}