{"gene":"RMC1","run_date":"2026-04-28T19:45:45","timeline":{"discoveries":[{"year":1999,"finding":"The Rmc1 locus on mouse chromosome 1 encodes a membrane protein related to yeast Syg1p (suppressor of G-alpha deletion) that functions as a cellular receptor mediating entry of polytropic/MCF and xenotropic murine leukemia viruses (MLV). Expression of mouse Syg1/Rmc1 cDNA in non-permissive hamster cells conferred susceptibility to MCF MLV infection, and the receptor-binding domain of MCF MLV envelope protein bound specifically to Xenopus oocytes expressing mouse Syg1. Human SYG1 expression established infectivity for both MCF and xenotropic MLV.","method":"Expression cloning in non-permissive hamster cells, beta-galactosidase/G418 infectibility screen, Xenopus oocyte binding assay, chromosomal mapping","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 1-2 — functional reconstitution in non-permissive cells plus direct receptor-ligand binding assay, single lab but multiple orthogonal methods","pmids":["9988277"],"is_preprint":false},{"year":1991,"finding":"Rmc-1, the cellular receptor gene for the MCF class of murine retroviruses, was physically mapped to mouse chromosome 1 in a region linked to Lamb2, between the Lamb2 and Bxv-1 loci, using an irradiation-reduced somatic cell hybrid panel and a viral infectibility assay.","method":"Irradiation fusion hybrid mapping panel, viral infectibility assay, somatic cell genetics","journal":"Somatic cell and molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 — genetic mapping with functional infectibility readout, single lab","pmids":["2011795"],"is_preprint":false},{"year":1999,"finding":"The Rmc1 candidate region was refined to approximately 600 kb on mouse chromosome 1 using an integrated somatic cell hybrid, YAC, and BAC contig, physically ordering multiple genes and loci including a recently identified candidate for Rmc1.","method":"YAC/BAC contig construction, somatic cell hybrid panel, physical mapping","journal":"Genomics","confidence":"Low","confidence_rationale":"Tier 3 — physical mapping only, no direct functional assay for the protein mechanism","pmids":["10373331"],"is_preprint":false},{"year":2017,"finding":"C18orf8/RMC1 was identified as a new subunit of the CCZ1-MON1 RAB7 guanine nucleotide exchange factor (GEF) complex that positively regulates RAB7 recruitment to late endosomes/autophagosomes. RMC1 was discovered through interaction proteomics of proteins accumulating in GABARAP/L1/L2-deficient cells. Loss of GABARAP subfamily ATG8 proteins caused accumulation of late endosome/autophagosome maturation regulators including the CCZ1-MON1-RMC1 complex.","method":"Interaction proteomics (AP-MS) in GABARAP-deficient cells, genetic engineering (CRISPR knockout of ATG8 genes), quantitative proteomics of autophagosomes","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 — AP-MS interactome discovery with genetic loss-of-function and quantitative proteomics, replicated across ATG8 subfamily knockouts","pmids":["29038162"],"is_preprint":false},{"year":2020,"finding":"C18orf8 (RMC1) was characterized as a core subunit of the mammalian Mon1-Ccz1 GEF complex required for RAB7 activation, complex stability, and function. C18orf8-deficient cells lack RAB7 activation, show severe defects in late endosome morphology and endosomal LDL trafficking, and accumulate free cholesterol within swollen lysosomes due to a critical defect in NPC1-dependent lysosomal cholesterol export. Active RAB7 (downstream of the trimeric Mon1-Ccz1-C18orf8/MCC GEF) interacts with the NPC1 cholesterol transporter to license lysosomal cholesterol export.","method":"Genome-wide CRISPR screen with endogenous cholesterol reporter, CRISPR knockout of C18orf8/CCZ1/MON1A/B, late endosome morphology imaging, LDL trafficking assays, cholesterol accumulation assays (filipin staining), constitutively active RAB7 rescue experiments","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1-2 — genome-wide CRISPR screen plus multiple loss-of-function and rescue experiments with defined molecular phenotypes, single lab with orthogonal methods","pmids":["33144569"],"is_preprint":false},{"year":2021,"finding":"RMC1 (C18orf8) interacts with MON1 and CCZ1 as part of the RAB7A GEF complex and is required for RAB7A localization on depolarized mitochondria during mitophagy. Depletion of a related subunit (C5orf51) that also interacts with the MON1-CCZ1-RMC1 complex compromises RAB7A stability and its translocation to mitochondria, implicating the trimeric complex in mitophagy.","method":"Proximity-dependent biotinylation (miniTurbo), co-immunoprecipitation, CRISPR/siRNA knockdown, confocal imaging of RAB7A localization on depolarized mitochondria, proteasome inhibitor rescue","journal":"Autophagy","confidence":"Medium","confidence_rationale":"Tier 2-3 — proximity labeling and co-IP confirm complex membership; RMC1 mentioned as component but functional experiments focus on C5orf51","pmids":["34432599"],"is_preprint":false},{"year":2023,"finding":"A near-atomic resolution cryo-EM structure of the Drosophila Mon1-Ccz1-RMC1 trimeric complex was determined. RMC1 acts as a scaffolding subunit that binds both Mon1 and Ccz1 on the surface opposite to the RAB7A-binding site; the RMC1-contacting residues on Mon1 and Ccz1 are unique to metazoans, explaining binding specificity. Assembly of RMC1 with Mon1-Ccz1 is required for cellular RAB7A activation, autophagic functions, and organismal development in zebrafish, demonstrating that the trimeric metazoan complex is functionally distinct from the fungal dimeric Mon1-Ccz1.","method":"Cryo-EM structure determination (near-atomic resolution), mutagenesis of RMC1-contacting residues, zebrafish knockdown/knockout developmental assays, autophagic flux assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 — cryo-EM structure with functional validation by mutagenesis and in vivo zebrafish experiments, multiple orthogonal methods in one study","pmids":["37216550"],"is_preprint":false},{"year":2025,"finding":"Structural and functional comparison of the trimeric Mon1-Ccz1-RMC1 (metazoan) complex with the dimeric fungal Mon1-Ccz1 revealed that RMC1/Bulli mediates membrane recruitment of the GEF complex through electrostatic interactions, via a distinct interface compared to the fungal dimer. Protein-lipid interaction studies demonstrated that RMC1 functions within the complex as a mediator of membrane recruitment, providing a mechanistic basis for the additional subunit in metazoan cells.","method":"Structural comparison (cryo-EM/structural biology), protein-lipid interaction studies, reconstitution experiments, comparison with Fuzzy-Inturned GEF complex","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 1-2 — structural analysis with protein-lipid reconstitution; preprint, not yet peer-reviewed","pmids":["bio_10.1101_2025.03.27.645700"],"is_preprint":true}],"current_model":"RMC1 (C18orf8) is a metazoan-specific scaffolding subunit of the trimeric Mon1-Ccz1-RMC1 guanine nucleotide exchange factor (GEF) complex that activates the small GTPase RAB7A on late endosomes and autophagosomes; cryo-EM structures show RMC1 binds Mon1 and Ccz1 on the face opposite the RAB7A-binding site via metazoan-specific contacts, and protein-lipid studies demonstrate RMC1 mediates membrane recruitment of the complex, with loss of RMC1 abolishing RAB7 activation, disrupting late endosome morphology, blocking NPC1-dependent lysosomal cholesterol export, and impairing autophagic flux and organismal development."},"narrative":{"teleology":[{"year":1991,"claim":"Genetic mapping established that a single locus on mouse chromosome 1 encodes the cellular receptor permitting MCF murine retrovirus entry, providing the first chromosomal anchor for what would later be identified as the RMC1 gene.","evidence":"Irradiation fusion somatic cell hybrid panel with viral infectibility assay","pmids":["2011795"],"confidence":"Medium","gaps":["Gene identity not yet determined","No molecular characterization of the encoded protein"]},{"year":1999,"claim":"Expression cloning identified the Rmc1/Syg1 gene product as a membrane protein that functions as a cellular receptor mediating entry of MCF and xenotropic murine leukemia viruses, establishing the first molecular function attributed to this locus.","evidence":"Expression of mouse Syg1/Rmc1 cDNA in non-permissive hamster cells conferred MCF MLV susceptibility; direct receptor–ligand binding confirmed in Xenopus oocytes","pmids":["9988277"],"confidence":"High","gaps":["Endogenous cellular function of the protein beyond virus entry was unknown","Mechanism of receptor-mediated viral entry not resolved at a structural level"]},{"year":2017,"claim":"Interaction proteomics revealed that C18orf8/RMC1 is a novel subunit of the Mon1–Ccz1 RAB7 GEF complex, redefining the protein's primary cellular role from viral receptor to endosomal/autophagosomal GEF component.","evidence":"AP-MS in GABARAP-subfamily-deficient cells identified RMC1 copurifying with CCZ1 and MON1; quantitative proteomics confirmed accumulation of the trimeric complex on autophagosomes","pmids":["29038162"],"confidence":"High","gaps":["Whether RMC1 is required for RAB7 activation was not yet tested by loss-of-function","Structural basis of RMC1 incorporation into the complex was unknown"]},{"year":2020,"claim":"Genome-wide CRISPR screening and targeted knockouts demonstrated that RMC1 is essential for RAB7 activation, late endosome integrity, and NPC1-dependent lysosomal cholesterol export, establishing the phenotypic consequences of losing the trimeric GEF.","evidence":"CRISPR knockout of C18orf8 in human cells; filipin staining, LDL trafficking assays, endosome morphology imaging, constitutively active RAB7 rescue","pmids":["33144569"],"confidence":"High","gaps":["Structural basis for how RMC1 integrates into the Mon1–Ccz1 dimer was unresolved","Whether cholesterol export defect is direct or secondary to general RAB7 loss was not fully distinguished"]},{"year":2021,"claim":"Proximity labeling and knockdown studies extended the functional scope of the Mon1–Ccz1–RMC1 complex to mitophagy, showing RAB7A recruitment to depolarized mitochondria depends on the trimeric complex.","evidence":"MiniTurbo proximity biotinylation, co-IP, CRISPR/siRNA knockdown, confocal imaging of RAB7A on depolarized mitochondria","pmids":["34432599"],"confidence":"Medium","gaps":["Functional experiments focused on C5orf51 rather than RMC1 directly; RMC1-specific requirement in mitophagy awaits dedicated loss-of-function analysis","Whether the complex acts catalytically on mitochondrial membranes versus being recruited post-RAB7 activation is unclear"]},{"year":2023,"claim":"A near-atomic cryo-EM structure of the Drosophila trimeric complex revealed that RMC1 scaffolds Mon1 and Ccz1 on the face opposite the RAB7A-binding site via metazoan-specific contacts, and functional validation showed that these contacts are required for RAB7A activation, autophagy, and zebrafish development.","evidence":"Cryo-EM structure determination, mutagenesis of RMC1-contacting residues, zebrafish knockdown/knockout developmental and autophagic flux assays","pmids":["37216550"],"confidence":"High","gaps":["Mechanism by which the complex is recruited to specific membranes was not resolved","No mammalian structure yet reported","How metazoan-specific contacts evolved from the fungal dimer is speculative"]},{"year":2025,"claim":"Protein–lipid interaction studies established that RMC1 mediates membrane recruitment of the trimeric GEF complex through electrostatic interactions, explaining why metazoans require the additional subunit relative to fungi.","evidence":"Structural comparison (cryo-EM), protein–lipid reconstitution experiments (preprint)","pmids":["bio_10.1101_2025.03.27.645700"],"confidence":"Medium","gaps":["Preprint; not yet peer-reviewed","Lipid specificity and regulation of membrane binding in vivo are undefined","Whether RMC1-mediated membrane recruitment is regulated by upstream signals is unknown"]},{"year":null,"claim":"How the dual identity of RMC1 — as a retroviral receptor and an essential GEF scaffold — is reconciled at the structural and evolutionary level, and whether RMC1-mediated membrane recruitment is dynamically regulated, remain open questions.","evidence":"","pmids":[],"confidence":"Low","gaps":["No structural data linking the viral receptor function to the GEF scaffolding role","Regulatory inputs controlling RMC1 membrane association are unknown","Mammalian cryo-EM structure of the trimeric complex has not been reported"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[3,4,6]},{"term_id":"GO:0001618","term_label":"virus receptor activity","supporting_discovery_ids":[0]}],"localization":[{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[3,4]},{"term_id":"GO:0005764","term_label":"lysosome","supporting_discovery_ids":[4]}],"pathway":[{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[3,5,6]},{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[4]},{"term_id":"R-HSA-382551","term_label":"Transport of small molecules","supporting_discovery_ids":[4]}],"complexes":["Mon1-Ccz1-RMC1 (MCC) trimeric GEF complex"],"partners":["MON1A","MON1B","CCZ1","RAB7A","NPC1"],"other_free_text":[]},"mechanistic_narrative":"RMC1 (C18orf8) is a metazoan-specific scaffolding subunit of the trimeric Mon1–Ccz1–RMC1 guanine nucleotide exchange factor (GEF) complex that activates the small GTPase RAB7A on late endosomes and autophagosomes. Cryo-EM structures show that RMC1 binds both Mon1 and Ccz1 on the face opposite the RAB7A-binding site via metazoan-specific contact residues, and protein–lipid studies indicate RMC1 mediates membrane recruitment of the complex [PMID:37216550]. Loss of RMC1 abolishes RAB7 activation, disrupts late endosome morphology, blocks NPC1-dependent lysosomal cholesterol export, and impairs autophagic flux and organismal development [PMID:33144569, PMID:29038162]. RMC1 was also independently identified as the cellular receptor for polytropic/MCF and xenotropic murine leukemia viruses [PMID:9988277]."},"prefetch_data":{"uniprot":{"accession":"Q96DM3","full_name":"Regulator of MON1-CCZ1 complex","aliases":["Colon cancer-associated protein Mic1","Mic-1","WD repeat-containing protein 98"],"length_aa":657,"mass_kda":75.0,"function":"Component of the CCZ1-MON1 RAB7A guanine exchange factor (GEF). Acts as a positive regulator of CCZ1-MON1A/B function necessary for endosomal/autophagic flux and efficient RAB7A localization (PubMed:29038162)","subcellular_location":"Lysosome membrane; Late endosome membrane","url":"https://www.uniprot.org/uniprotkb/Q96DM3/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/RMC1","classification":"Not Classified","n_dependent_lines":4,"n_total_lines":1208,"dependency_fraction":0.0033112582781456954},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"CCZ1B","stoichiometry":10.0}],"url":"https://opencell.sf.czbiohub.org/search/RMC1","total_profiled":1310},"omim":[{"mim_id":"620267","title":"REGULATOR OF MON1-CCZ1; RMC1","url":"https://www.omim.org/entry/620267"},{"mim_id":"605237","title":"XENOTROPIC AND POLYTROPIC RETROVIRUS RECEPTOR; XPR1","url":"https://www.omim.org/entry/605237"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Uncertain","locations":[{"location":"Nucleoplasm","reliability":"Uncertain"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/RMC1"},"hgnc":{"alias_symbol":["MIC1","HsT2591"],"prev_symbol":["C18orf8","WDR98"]},"alphafold":{"accession":"Q96DM3","domains":[{"cath_id":"-","chopping":"2-15_210-317_331-364","consensus_level":"medium","plddt":90.1058,"start":2,"end":364},{"cath_id":"2.130.10.10","chopping":"19-150","consensus_level":"medium","plddt":89.6399,"start":19,"end":150},{"cath_id":"1.25.40","chopping":"562-657","consensus_level":"medium","plddt":85.9728,"start":562,"end":657}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96DM3","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q96DM3-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q96DM3-F1-predicted_aligned_error_v6.png","plddt_mean":88.69},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=RMC1","jax_strain_url":"https://www.jax.org/strain/search?query=RMC1"},"sequence":{"accession":"Q96DM3","fasta_url":"https://rest.uniprot.org/uniprotkb/Q96DM3.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q96DM3/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96DM3"}},"corpus_meta":[{"pmid":"9326641","id":"PMC_9326641","title":"MIC-1, 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endosomes/autophagosomes. RMC1 was found by interaction proteomics of proteins accumulating in GABARAP/L1/L2-deficient cells.\",\n      \"method\": \"Interaction proteomics (AP-MS), genetic engineering of ATG8-deficient cell lines, quantitative proteomics of lysosomal content\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal interaction proteomics with functional validation in defined KO cell lines, multiple orthogonal methods\",\n      \"pmids\": [\"29038162\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"RMC1/Bulli functions as a third subunit of the metazoan Mon1-Ccz1 RAB GEF complex and mediates membrane recruitment of the complex through electrostatic protein-lipid interactions, a function not present in the dimeric fungal Mon1-Ccz1. Structural and functional comparison revealed that RMC1 provides a distinct membrane-binding interface compared to the fungal complex.\",\n      \"method\": \"Structural analysis (cryo-EM/comparative), protein-lipid interaction studies, reconstitution experiments, functional comparison of fungal vs. metazoan complexes\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstitution, structural analysis, and protein-lipid interaction studies with functional validation in a single study\",\n      \"pmids\": [\"bio_10.1101_2025.03.27.645700\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"The Rmc1 locus on mouse chromosome 1 encodes a membrane protein related to yeast Syg1p (suppressor of G-alpha deletion) that functions as a receptor for polytropic/MCF and xenotropic murine leukemia viruses (MLV), mediating virus entry. The receptor-binding domain of MCF MLV envelope protein binds specifically to Xenopus oocytes expressing mouse Syg1/Rmc1.\",\n      \"method\": \"Expression cloning in hamster cells, viral infectibility assay, Xenopus oocyte expression and binding assay, chromosomal mapping\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — functional reconstitution of virus entry in non-permissive cells, specific binding assay, replicated with human ortholog\",\n      \"pmids\": [\"9988277\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"Rmc-1, encoding a cellular receptor for the MCF class of murine retroviruses, was physically mapped to a region of mouse chromosome 1 linked to Lamb2, between the Lamb2 and Bxv-1 loci, using irradiation fusion hybrid mapping and viral infectibility assays.\",\n      \"method\": \"Somatic cell hybrid mapping panel, viral infectibility assay, physical mapping\",\n      \"journal\": \"Somatic cell and molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic mapping with functional readout (viral infectibility), single study\",\n      \"pmids\": [\"2011795\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"RMC1 (C18orf8) is a subunit of the metazoan CCZ1-MON1 RAB7 guanine exchange factor complex that mediates membrane recruitment of the complex via electrostatic protein-lipid interactions, thereby positively regulating RAB7 recruitment to late endosomes and autophagosomes to promote autophagic flux; the murine ortholog (Rmc1/Syg1) also encodes a membrane protein that serves as a receptor for polytropic and xenotropic murine leukemia viruses mediating viral entry.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\nI'll classify each paper first, then extract discoveries only from KEEP papers.\n\n**Classification:**\n\n- Papers about MIC-1/GDF15 (TGF-β cytokine): EXCLUDE (alias collision - different protein)\n- Papers about Toxoplasma gondii MIC1 (microneme protein): EXCLUDE (symbol collision - parasite protein)\n- Papers about rMC-1 (rat Müller cell line): EXCLUDE (cell line name, not gene)\n- Papers about Mic1 cyanophage: EXCLUDE (symbol collision - viral/bacterial)\n- Papers about Cryptosporidium MIC1: EXCLUDE (symbol collision)\n- Papers about Babesia MIC1: EXCLUDE (symbol collision)\n- Papers about Prolixibacter MIC1-1: EXCLUDE (symbol collision)\n- Papers about Rmc1 (mouse retrovirus receptor locus/gene, encoding Syg1p-related membrane protein): These map to the same locus but describe a retrovirus receptor function. PMID 9988277, 2011795, 10373331 — these describe the mouse Rmc1 locus mapping, and PMID 9988277 identifies the gene product as a Syg1p-related membrane protein serving as a retrovirus receptor. KEEP (foundational gene identification).\n- PMID 29038162 (Vaites et al. 2017) — identifies C18orf8/RMC1 as new subunit of CCZ1-MON1 RAB7 GEF: **KEEP**\n- PMID 33144569 (van den Boomen et al. 2020) — C18orf8 as core subunit of Mon1-Ccz1 GEF for Rab7: **KEEP**\n- PMID 37216550 (Yong et al. 2023) — Cryo-EM structure of Mon1-Ccz1-RMC1: **KEEP**\n- PMID 34432599 (Yan et al. 2021) — C5orf51/MON1-CCZ1 complex, mentions RMC1: **KEEP**\n- bio_10.1101_2025.03.27.645700 (Wilmes et al. 2025 preprint) — RMC1/Bulli membrane recruitment function: **KEEP**\n- PMID 40437099 (Gonzalez-Lozano et al. 2025) — EndoMAP, mentions endosomal complexes: Review for RMC1 content — mentions endosome structural interactome broadly; **KEEP** if RMC1 mechanistic content present (the abstract doesn't specifically mention RMC1 mechanistically, so **EXCLUDE**)\n- PMID 29360040 (Yamano et al. 2018) — RABGEF1/RAB7A mitophagy, mentions RMC1 only in abbreviation list: **EXCLUDE** (RMC1 not mechanistically studied)\n- PMID 39058128 (Lerma-Treviño et al. 2024) — C18ORF8 DNA methylation/arsenic: EXCLUDE (expression/epigenetic association, no mechanism)\n- PMID 37511330 (Matos et al. 2023) — PvRMC-1 chimeric malaria protein: EXCLUDE (alias collision - Plasmodium chimeric antigen)\n- Remaining gene2pubmed papers (interactome databases, cDNA collections, phosphoproteomics): These detect RMC1 as part of large-scale datasets but provide no specific mechanistic findings about RMC1 itself. **EXCLUDE** from discoveries.\n- PMID 44 (Wilson et al. 1999) — MIC1 gene on chromosome 11 encoding CD59 epitope: EXCLUDE (different gene/alias collision)\n\n**KEEP papers:** 9988277, 2011795, 10373331, 29038162, 33144569, 37216550, 34432599, bio_10.1101_2025.03.27.645700\n\nNow extracting:\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1999,\n      \"finding\": \"The Rmc1 locus on mouse chromosome 1 encodes a membrane protein related to yeast Syg1p (suppressor of G-alpha deletion) that functions as a cellular receptor mediating entry of polytropic/MCF and xenotropic murine leukemia viruses (MLV). Expression of mouse Syg1/Rmc1 cDNA in non-permissive hamster cells conferred susceptibility to MCF MLV infection, and the receptor-binding domain of MCF MLV envelope protein bound specifically to Xenopus oocytes expressing mouse Syg1. Human SYG1 expression established infectivity for both MCF and xenotropic MLV.\",\n      \"method\": \"Expression cloning in non-permissive hamster cells, beta-galactosidase/G418 infectibility screen, Xenopus oocyte binding assay, chromosomal mapping\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — functional reconstitution in non-permissive cells plus direct receptor-ligand binding assay, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"9988277\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"Rmc-1, the cellular receptor gene for the MCF class of murine retroviruses, was physically mapped to mouse chromosome 1 in a region linked to Lamb2, between the Lamb2 and Bxv-1 loci, using an irradiation-reduced somatic cell hybrid panel and a viral infectibility assay.\",\n      \"method\": \"Irradiation fusion hybrid mapping panel, viral infectibility assay, somatic cell genetics\",\n      \"journal\": \"Somatic cell and molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic mapping with functional infectibility readout, single lab\",\n      \"pmids\": [\"2011795\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"The Rmc1 candidate region was refined to approximately 600 kb on mouse chromosome 1 using an integrated somatic cell hybrid, YAC, and BAC contig, physically ordering multiple genes and loci including a recently identified candidate for Rmc1.\",\n      \"method\": \"YAC/BAC contig construction, somatic cell hybrid panel, physical mapping\",\n      \"journal\": \"Genomics\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — physical mapping only, no direct functional assay for the protein mechanism\",\n      \"pmids\": [\"10373331\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"C18orf8/RMC1 was identified as a new subunit of the CCZ1-MON1 RAB7 guanine nucleotide exchange factor (GEF) complex that positively regulates RAB7 recruitment to late endosomes/autophagosomes. RMC1 was discovered through interaction proteomics of proteins accumulating in GABARAP/L1/L2-deficient cells. Loss of GABARAP subfamily ATG8 proteins caused accumulation of late endosome/autophagosome maturation regulators including the CCZ1-MON1-RMC1 complex.\",\n      \"method\": \"Interaction proteomics (AP-MS) in GABARAP-deficient cells, genetic engineering (CRISPR knockout of ATG8 genes), quantitative proteomics of autophagosomes\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — AP-MS interactome discovery with genetic loss-of-function and quantitative proteomics, replicated across ATG8 subfamily knockouts\",\n      \"pmids\": [\"29038162\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"C18orf8 (RMC1) was characterized as a core subunit of the mammalian Mon1-Ccz1 GEF complex required for RAB7 activation, complex stability, and function. C18orf8-deficient cells lack RAB7 activation, show severe defects in late endosome morphology and endosomal LDL trafficking, and accumulate free cholesterol within swollen lysosomes due to a critical defect in NPC1-dependent lysosomal cholesterol export. Active RAB7 (downstream of the trimeric Mon1-Ccz1-C18orf8/MCC GEF) interacts with the NPC1 cholesterol transporter to license lysosomal cholesterol export.\",\n      \"method\": \"Genome-wide CRISPR screen with endogenous cholesterol reporter, CRISPR knockout of C18orf8/CCZ1/MON1A/B, late endosome morphology imaging, LDL trafficking assays, cholesterol accumulation assays (filipin staining), constitutively active RAB7 rescue experiments\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — genome-wide CRISPR screen plus multiple loss-of-function and rescue experiments with defined molecular phenotypes, single lab with orthogonal methods\",\n      \"pmids\": [\"33144569\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"RMC1 (C18orf8) interacts with MON1 and CCZ1 as part of the RAB7A GEF complex and is required for RAB7A localization on depolarized mitochondria during mitophagy. Depletion of a related subunit (C5orf51) that also interacts with the MON1-CCZ1-RMC1 complex compromises RAB7A stability and its translocation to mitochondria, implicating the trimeric complex in mitophagy.\",\n      \"method\": \"Proximity-dependent biotinylation (miniTurbo), co-immunoprecipitation, CRISPR/siRNA knockdown, confocal imaging of RAB7A localization on depolarized mitochondria, proteasome inhibitor rescue\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — proximity labeling and co-IP confirm complex membership; RMC1 mentioned as component but functional experiments focus on C5orf51\",\n      \"pmids\": [\"34432599\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"A near-atomic resolution cryo-EM structure of the Drosophila Mon1-Ccz1-RMC1 trimeric complex was determined. RMC1 acts as a scaffolding subunit that binds both Mon1 and Ccz1 on the surface opposite to the RAB7A-binding site; the RMC1-contacting residues on Mon1 and Ccz1 are unique to metazoans, explaining binding specificity. Assembly of RMC1 with Mon1-Ccz1 is required for cellular RAB7A activation, autophagic functions, and organismal development in zebrafish, demonstrating that the trimeric metazoan complex is functionally distinct from the fungal dimeric Mon1-Ccz1.\",\n      \"method\": \"Cryo-EM structure determination (near-atomic resolution), mutagenesis of RMC1-contacting residues, zebrafish knockdown/knockout developmental assays, autophagic flux assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — cryo-EM structure with functional validation by mutagenesis and in vivo zebrafish experiments, multiple orthogonal methods in one study\",\n      \"pmids\": [\"37216550\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Structural and functional comparison of the trimeric Mon1-Ccz1-RMC1 (metazoan) complex with the dimeric fungal Mon1-Ccz1 revealed that RMC1/Bulli mediates membrane recruitment of the GEF complex through electrostatic interactions, via a distinct interface compared to the fungal dimer. Protein-lipid interaction studies demonstrated that RMC1 functions within the complex as a mediator of membrane recruitment, providing a mechanistic basis for the additional subunit in metazoan cells.\",\n      \"method\": \"Structural comparison (cryo-EM/structural biology), protein-lipid interaction studies, reconstitution experiments, comparison with Fuzzy-Inturned GEF complex\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 — structural analysis with protein-lipid reconstitution; preprint, not yet peer-reviewed\",\n      \"pmids\": [\"bio_10.1101_2025.03.27.645700\"],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"RMC1 (C18orf8) is a metazoan-specific scaffolding subunit of the trimeric Mon1-Ccz1-RMC1 guanine nucleotide exchange factor (GEF) complex that activates the small GTPase RAB7A on late endosomes and autophagosomes; cryo-EM structures show RMC1 binds Mon1 and Ccz1 on the face opposite the RAB7A-binding site via metazoan-specific contacts, and protein-lipid studies demonstrate RMC1 mediates membrane recruitment of the complex, with loss of RMC1 abolishing RAB7 activation, disrupting late endosome morphology, blocking NPC1-dependent lysosomal cholesterol export, and impairing autophagic flux and organismal development.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"RMC1 (C18orf8) is a metazoan-specific subunit of the CCZ1–MON1 RAB7 guanine nucleotide exchange factor (GEF) complex that promotes RAB7 recruitment to late endosomes and autophagosomes, thereby supporting endolysosomal trafficking and autophagic flux [PMID:29038162]. RMC1 mediates membrane recruitment of the trimeric complex through electrostatic protein–lipid interactions, providing a distinct membrane-binding interface absent in the dimeric fungal Mon1–Ccz1 complex [bio_10.1101_2025.03.27.645700]. The murine ortholog (Rmc1/Syg1) additionally functions as a cell-surface receptor for polytropic and xenotropic murine leukemia viruses, mediating viral entry into host cells [PMID:9988277].\",\n  \"teleology\": [\n    {\n      \"year\": 1991,\n      \"claim\": \"Genetic mapping established that a host factor for MCF murine retrovirus entry resided on mouse chromosome 1, defining the Rmc-1 locus before its molecular identity was known.\",\n      \"evidence\": \"Somatic cell hybrid mapping with viral infectibility assays in mouse chromosome 1 radiation hybrids\",\n      \"pmids\": [\"2011795\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Gene product identity and biochemical function were unknown\",\n        \"Single mapping study without independent confirmation of the precise locus boundaries\"\n      ]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Molecular cloning revealed that Rmc1 encodes a membrane protein (related to yeast Syg1p) that is necessary and sufficient for polytropic/xenotropic MLV entry, resolving the receptor identity for this virus class.\",\n      \"evidence\": \"Expression cloning in non-permissive hamster cells reconstituted virus entry; specific binding of MCF envelope to Xenopus oocytes expressing Rmc1\",\n      \"pmids\": [\"9988277\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Structural basis of virus–receptor interaction not determined\",\n        \"Whether the viral receptor function is conserved in human RMC1 was not fully characterized\",\n        \"Endogenous cellular function of the protein beyond viral entry was unknown\"\n      ]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Interaction proteomics identified RMC1 as a new subunit of the CCZ1–MON1 RAB7 GEF complex, establishing its endogenous role in late endosome/autophagosome maturation — a function unrelated to its earlier-known viral receptor activity.\",\n      \"evidence\": \"AP-MS from GABARAP/L1/L2-knockout cell lines with quantitative lysosomal proteomics and functional validation\",\n      \"pmids\": [\"29038162\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Mechanism by which RMC1 contributes to GEF activity or complex assembly was not resolved\",\n        \"Whether RMC1 loss phenocopies MON1 or CCZ1 loss in all endolysosomal pathways was not tested\"\n      ]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Structural and biochemical reconstitution demonstrated that RMC1 mediates membrane recruitment of the metazoan GEF complex via electrostatic protein–lipid interactions, explaining why metazoan endosomal RAB7 activation depends on a trimeric rather than dimeric complex.\",\n      \"evidence\": \"Cryo-EM structural comparison of metazoan trimeric vs. fungal dimeric complexes; reconstituted protein–lipid binding assays (preprint)\",\n      \"pmids\": [\"bio_10.1101_2025.03.27.645700\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Preprint; awaits peer review\",\n        \"Specific lipid species required for RMC1-mediated membrane recruitment not fully defined\",\n        \"In vivo validation of the membrane-binding interface mutations in animal models is lacking\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved how RMC1's dual identity as an endosomal GEF subunit and a viral entry receptor are structurally and functionally reconciled, and whether its membrane-binding activity influences viral susceptibility.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No study has integrated the viral receptor and RAB7 GEF functions of RMC1 into a unified model\",\n        \"Tissue-specific and developmental roles of RMC1 are uncharacterized\",\n        \"No disease-associated mutations in human RMC1 have been reported\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [1]},\n      {\"term_id\": \"GO:0001618\", \"supporting_discovery_ids\": [2]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [2]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"complexes\": [\n      \"CCZ1-MON1-RMC1 RAB7 GEF complex\"\n    ],\n    \"partners\": [\n      \"CCZ1\",\n      \"MON1A\",\n      \"MON1B\",\n      \"RAB7A\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"RMC1 (C18orf8) is a metazoan-specific scaffolding subunit of the trimeric Mon1–Ccz1–RMC1 guanine nucleotide exchange factor (GEF) complex that activates the small GTPase RAB7A on late endosomes and autophagosomes. Cryo-EM structures show that RMC1 binds both Mon1 and Ccz1 on the face opposite the RAB7A-binding site via metazoan-specific contact residues, and protein–lipid studies indicate RMC1 mediates membrane recruitment of the complex [PMID:37216550]. Loss of RMC1 abolishes RAB7 activation, disrupts late endosome morphology, blocks NPC1-dependent lysosomal cholesterol export, and impairs autophagic flux and organismal development [PMID:33144569, PMID:29038162]. RMC1 was also independently identified as the cellular receptor for polytropic/MCF and xenotropic murine leukemia viruses [PMID:9988277].\",\n  \"teleology\": [\n    {\n      \"year\": 1991,\n      \"claim\": \"Genetic mapping established that a single locus on mouse chromosome 1 encodes the cellular receptor permitting MCF murine retrovirus entry, providing the first chromosomal anchor for what would later be identified as the RMC1 gene.\",\n      \"evidence\": \"Irradiation fusion somatic cell hybrid panel with viral infectibility assay\",\n      \"pmids\": [\"2011795\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Gene identity not yet determined\",\n        \"No molecular characterization of the encoded protein\"\n      ]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Expression cloning identified the Rmc1/Syg1 gene product as a membrane protein that functions as a cellular receptor mediating entry of MCF and xenotropic murine leukemia viruses, establishing the first molecular function attributed to this locus.\",\n      \"evidence\": \"Expression of mouse Syg1/Rmc1 cDNA in non-permissive hamster cells conferred MCF MLV susceptibility; direct receptor–ligand binding confirmed in Xenopus oocytes\",\n      \"pmids\": [\"9988277\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Endogenous cellular function of the protein beyond virus entry was unknown\",\n        \"Mechanism of receptor-mediated viral entry not resolved at a structural level\"\n      ]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Interaction proteomics revealed that C18orf8/RMC1 is a novel subunit of the Mon1–Ccz1 RAB7 GEF complex, redefining the protein's primary cellular role from viral receptor to endosomal/autophagosomal GEF component.\",\n      \"evidence\": \"AP-MS in GABARAP-subfamily-deficient cells identified RMC1 copurifying with CCZ1 and MON1; quantitative proteomics confirmed accumulation of the trimeric complex on autophagosomes\",\n      \"pmids\": [\"29038162\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether RMC1 is required for RAB7 activation was not yet tested by loss-of-function\",\n        \"Structural basis of RMC1 incorporation into the complex was unknown\"\n      ]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Genome-wide CRISPR screening and targeted knockouts demonstrated that RMC1 is essential for RAB7 activation, late endosome integrity, and NPC1-dependent lysosomal cholesterol export, establishing the phenotypic consequences of losing the trimeric GEF.\",\n      \"evidence\": \"CRISPR knockout of C18orf8 in human cells; filipin staining, LDL trafficking assays, endosome morphology imaging, constitutively active RAB7 rescue\",\n      \"pmids\": [\"33144569\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Structural basis for how RMC1 integrates into the Mon1–Ccz1 dimer was unresolved\",\n        \"Whether cholesterol export defect is direct or secondary to general RAB7 loss was not fully distinguished\"\n      ]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Proximity labeling and knockdown studies extended the functional scope of the Mon1–Ccz1–RMC1 complex to mitophagy, showing RAB7A recruitment to depolarized mitochondria depends on the trimeric complex.\",\n      \"evidence\": \"MiniTurbo proximity biotinylation, co-IP, CRISPR/siRNA knockdown, confocal imaging of RAB7A on depolarized mitochondria\",\n      \"pmids\": [\"34432599\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Functional experiments focused on C5orf51 rather than RMC1 directly; RMC1-specific requirement in mitophagy awaits dedicated loss-of-function analysis\",\n        \"Whether the complex acts catalytically on mitochondrial membranes versus being recruited post-RAB7 activation is unclear\"\n      ]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"A near-atomic cryo-EM structure of the Drosophila trimeric complex revealed that RMC1 scaffolds Mon1 and Ccz1 on the face opposite the RAB7A-binding site via metazoan-specific contacts, and functional validation showed that these contacts are required for RAB7A activation, autophagy, and zebrafish development.\",\n      \"evidence\": \"Cryo-EM structure determination, mutagenesis of RMC1-contacting residues, zebrafish knockdown/knockout developmental and autophagic flux assays\",\n      \"pmids\": [\"37216550\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Mechanism by which the complex is recruited to specific membranes was not resolved\",\n        \"No mammalian structure yet reported\",\n        \"How metazoan-specific contacts evolved from the fungal dimer is speculative\"\n      ]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Protein–lipid interaction studies established that RMC1 mediates membrane recruitment of the trimeric GEF complex through electrostatic interactions, explaining why metazoans require the additional subunit relative to fungi.\",\n      \"evidence\": \"Structural comparison (cryo-EM), protein–lipid reconstitution experiments (preprint)\",\n      \"pmids\": [\"bio_10.1101_2025.03.27.645700\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Preprint; not yet peer-reviewed\",\n        \"Lipid specificity and regulation of membrane binding in vivo are undefined\",\n        \"Whether RMC1-mediated membrane recruitment is regulated by upstream signals is unknown\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the dual identity of RMC1 — as a retroviral receptor and an essential GEF scaffold — is reconciled at the structural and evolutionary level, and whether RMC1-mediated membrane recruitment is dynamically regulated, remain open questions.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No structural data linking the viral receptor function to the GEF scaffolding role\",\n        \"Regulatory inputs controlling RMC1 membrane association are unknown\",\n        \"Mammalian cryo-EM structure of the trimeric complex has not been reported\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [3, 4, 6]},\n      {\"term_id\": \"GO:0001618\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [3, 4]},\n      {\"term_id\": \"GO:0005764\", \"supporting_discovery_ids\": [4]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [3, 5, 6]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [4]},\n      {\"term_id\": \"R-HSA-382551\", \"supporting_discovery_ids\": [4]}\n    ],\n    \"complexes\": [\n      \"Mon1-Ccz1-RMC1 (MCC) trimeric GEF complex\"\n    ],\n    \"partners\": [\n      \"MON1A\",\n      \"MON1B\",\n      \"CCZ1\",\n      \"RAB7A\",\n      \"NPC1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}