{"gene":"ARMC1","run_date":"2026-04-28T17:12:37","timeline":{"discoveries":[{"year":2019,"finding":"ARMC1 (ArmC1) is a dual-localization protein found in both the cytosol and mitochondria, where it associates with the outer mitochondrial membrane via its carboxy-terminus and co-purifies with components of the mitochondrial contact site and cristae organizing system (MICOS)/mitochondrial intermembrane space bridging (MIB) complex. Its levels are reduced upon MICOS/MIB complex depletion. Loss of ArmC1 results in mitochondrial fragmentation and reduced mitochondrial motility, but no defects in cristae ultrastructure, respiration, or protein import, identifying it as a peripheral MICOS/MIB component required for mitochondrial distribution.","method":"Subcellular fractionation, co-immunoprecipitation, immunofluorescence microscopy, siRNA knockdown with live-cell imaging of mitochondrial morphology and motility, proximity ligation assay","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (fractionation, Co-IP, live imaging, KD phenotype) in a single study with clear functional readout","pmids":["31644573"],"is_preprint":false},{"year":2025,"finding":"ARMC1 partitions between two distinct mitochondrial protein complexes that have opposing effects on mitochondrial distribution. In one complex, the mitochondrial trafficking adaptor MIRO recruits ARMC1, which in turn mediates the assembly and stability of the mitochondrial fission regulator MTFR; MIRO-MTFR complexes specifically antagonize retrograde mitochondrial movement. In a second complex, the MIB/MICOS subunit DNAJC11 facilitates ARMC1 release from mitochondria, limiting mitochondrially localized ARMC1 abundance. ARMC1 deletion causes perinuclear mitochondrial clustering that is not rescued by disrupting MIRO-MTFR assembly alone, whereas disrupting the ARMC1-DNAJC11 interaction leads to excessive mitochondrial ARMC1 and distinct mitochondrial defects, demonstrating that balanced mito-cytoplasmic shuttling of ARMC1 tunes steady-state mitochondrial distribution.","method":"AP-MS to identify complex members, co-immunoprecipitation to validate MIRO-ARMC1-MTFR and ARMC1-DNAJC11 interactions, CRISPR knockout and overexpression with live-cell mitochondrial imaging, domain mapping and interaction-disrupting mutants, MTFR stability assays","journal":"Science advances","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP, AP-MS, multiple KO/mutant lines with quantitative phenotypic readouts in a single rigorous study","pmids":["40203102"],"is_preprint":false},{"year":2025,"finding":"Mesenchymal stem cell (MSC)-conditioned medium increases ARMC1 protein levels in TGF-β1-treated tubular epithelial cells. ARMC1 overexpression reduces DRP1 (a pro-fission GTPase), enhances OPA1 and MFN2 (pro-fusion proteins), lowers reactive oxygen species, and suppresses fibrosis markers (α-SMA, fibronectin, collagen-I), indicating that ARMC1 shifts mitochondrial dynamics toward fusion and reduces oxidative stress in the context of renal fibrosis.","method":"Proteomics of renal tissue (adenine nephropathy model), lentiviral ARMC1 overexpression in HK-2 cells, western blotting for DRP1/OPA1/MFN2/NRF2/SOD1/SOD2, ROS measurement, mitochondrial morphology assessment, cisplatin mouse model with MSC intervention","journal":"Stem cell research & therapy","confidence":"Medium","confidence_rationale":"Tier 2-3 — functional overexpression with multiple molecular readouts but single lab, no reconstitution or direct ARMC1-DRP1 interaction demonstrated","pmids":["41153008"],"is_preprint":false},{"year":2021,"finding":"ARMC1 is catalogued as a component of the human mitochondrial high-confidence proteome (MitoCoP), placing it among >1,100 proteins with validated mitochondrial localization, with abundance and turnover dynamics consistent with a regulatory rather than structural role.","method":"Quantitative mass spectrometry of enriched mitochondrial fractions from human cells, protein half-life measurements","journal":"Cell metabolism","confidence":"Medium","confidence_rationale":"Tier 2 — large-scale quantitative proteomics with rigorous filtering, but ARMC1 is one of many proteins without targeted functional follow-up in this paper","pmids":["34800366"],"is_preprint":false},{"year":2022,"finding":"Endogenous tagging (OpenCell) of ARMC1 by CRISPR-mediated fluorescent knock-in reveals cytoplasmic and mitochondria-associated localization in living human cells, consistent with its dual compartmentalization.","method":"CRISPR endogenous tagging with mEGFP, confocal live-cell imaging, AP-MS for interaction partners","journal":"Science (New York, N.Y.)","confidence":"Medium","confidence_rationale":"Tier 2 — endogenous-tag live imaging is a direct localization experiment; ARMC1-specific interaction data from AP-MS adds functional context","pmids":["35271311"],"is_preprint":false},{"year":2019,"finding":"BioID proximity labeling of mitochondrial intermembrane space proteases places ARMC1 in proximity to MIB complex components, corroborating its association with this multi-subunit cristae-organizing assembly.","method":"In vivo proximity-dependent biotinylation (BioID) followed by mass spectrometry","journal":"Proteomics","confidence":"Medium","confidence_rationale":"Tier 3 — proximity labeling is indirect; consistent with Co-IP data from independent study (31644573)","pmids":["31617661"],"is_preprint":false},{"year":2017,"finding":"SLC25A46, a protein that interacts with the MICOS complex (which includes ARMC1 as a component), shows that perturbation of MICOS-associated proteins leads to mitochondrial hyperfusion, providing pathway-level context for ARMC1's role in cristae/outer membrane organization.","method":"Co-immunoprecipitation of SLC25A46 with MICOS subunits, siRNA knockdown, mitochondrial morphology imaging","journal":"Molecular biology of the cell","confidence":"Low","confidence_rationale":"Tier 3 — ARMC1 is implicated as a MICOS member by association; the paper's primary focus is SLC25A46, not ARMC1 directly","pmids":["28057766"],"is_preprint":false}],"current_model":"ARMC1 is a dual-localization protein (cytosol and outer mitochondrial membrane) that functions as a peripheral component of the MICOS/MIB complex and partitions between two distinct complexes: one in which the trafficking adaptor MIRO recruits ARMC1 to stabilize MTFR and antagonize retrograde mitochondrial movement, and another in which DNAJC11 releases ARMC1 from mitochondria; the balance of these interactions tunes steady-state mitochondrial distribution, and ARMC1 additionally shifts mitochondrial dynamics toward fusion by suppressing DRP1 and stabilizing OPA1/MFN2, with its loss causing mitochondrial fragmentation and perinuclear clustering."},"narrative":{"teleology":[{"year":2017,"claim":"Pathway-level context for ARMC1 emerged from studies of SLC25A46, which showed that perturbation of MICOS-associated proteins alters mitochondrial morphology, implicating MICOS peripheral components in cristae and outer membrane organization.","evidence":"Co-IP of SLC25A46 with MICOS subunits and siRNA knockdown with mitochondrial morphology imaging","pmids":["28057766"],"confidence":"Low","gaps":["ARMC1 was implicated only by its MICOS membership, not directly studied","no direct interaction between ARMC1 and SLC25A46 was tested","mechanism linking MICOS periphery to morphology control was undefined"]},{"year":2019,"claim":"The first direct functional characterization established that ARMC1 is a dual-localization protein (cytosol and outer mitochondrial membrane) that associates with the MICOS/MIB complex and is required for normal mitochondrial distribution and motility, but not for cristae structure or respiration.","evidence":"Subcellular fractionation, co-immunoprecipitation, proximity ligation assay, siRNA knockdown with live-cell imaging of mitochondrial morphology and motility in human cells","pmids":["31644573"],"confidence":"High","gaps":["mechanism by which ARMC1 loss causes fragmentation and reduced motility was unknown","identity of direct ARMC1 binding partners within the MICOS/MIB complex was not resolved","whether ARMC1's cytosolic pool has a distinct function was untested"]},{"year":2019,"claim":"Independent proximity labeling corroborated ARMC1's physical association with MIB complex components, strengthening its assignment as a bona fide MICOS/MIB-associated protein.","evidence":"BioID proximity-dependent biotinylation followed by mass spectrometry in human cells","pmids":["31617661"],"confidence":"Medium","gaps":["proximity labeling does not distinguish direct from indirect interactions","stoichiometry and stability of ARMC1 within the MIB complex were not addressed"]},{"year":2021,"claim":"Inclusion of ARMC1 in the high-confidence human mitochondrial proteome (MitoCoP) confirmed its mitochondrial residence and indicated regulatory-range abundance and turnover dynamics.","evidence":"Quantitative mass spectrometry of enriched mitochondrial fractions with protein half-life measurements","pmids":["34800366"],"confidence":"Medium","gaps":["no targeted functional analysis of ARMC1 was performed in this dataset","sub-mitochondrial compartmentalization was not resolved"]},{"year":2022,"claim":"Endogenous CRISPR tagging in living cells confirmed ARMC1's dual cytoplasmic and mitochondria-associated localization at physiological expression levels.","evidence":"CRISPR-mediated mEGFP knock-in with confocal live-cell imaging and AP-MS","pmids":["35271311"],"confidence":"Medium","gaps":["dynamics of shuttling between cytosol and mitochondria were not captured","interactome from AP-MS was not functionally validated for ARMC1 specifically"]},{"year":2025,"claim":"The mechanistic basis of ARMC1's role in mitochondrial positioning was resolved: ARMC1 partitions between a MIRO-recruited complex that stabilizes MTFR and antagonizes retrograde transport, and a DNAJC11-mediated complex that releases ARMC1 from mitochondria; balanced shuttling between these states tunes mitochondrial distribution.","evidence":"AP-MS, reciprocal co-immunoprecipitation, CRISPR KO and overexpression with live-cell mitochondrial imaging, domain mapping and interaction-disrupting mutants, MTFR stability assays","pmids":["40203102"],"confidence":"High","gaps":["structural basis of ARMC1's armadillo repeats engaging MIRO versus DNAJC11 is unresolved","whether ARMC1 shuttling is actively regulated by post-translational modifications is unknown","contribution of cytosolic ARMC1 pool beyond mitochondrial release is undefined"]},{"year":2025,"claim":"ARMC1 overexpression was shown to shift mitochondrial dynamics toward fusion by reducing DRP1 and stabilizing OPA1/MFN2, linking ARMC1 to the fission–fusion balance and oxidative stress suppression in a disease-relevant model of renal fibrosis.","evidence":"Lentiviral ARMC1 overexpression in tubular epithelial cells with western blotting for fission/fusion markers, ROS measurement, and in vivo cisplatin nephropathy model","pmids":["41153008"],"confidence":"Medium","gaps":["direct physical interaction between ARMC1 and DRP1 or OPA1/MFN2 was not demonstrated","whether the pro-fusion effect reflects ARMC1's normal physiological role or a gain-of-function overexpression artifact is unclear","relevance to tissues beyond kidney epithelium is untested"]},{"year":null,"claim":"How the armadillo repeat domain of ARMC1 selectively engages its two distinct complexes (MIRO-MTFR versus DNAJC11), whether post-translational modifications regulate this partitioning, and whether ARMC1 directly contacts the fission/fusion machinery remain open questions.","evidence":"","pmids":[],"confidence":"Low","gaps":["no structural model of ARMC1 or its interfaces exists","regulation of ARMC1 mito-cytoplasmic shuttling is mechanistically uncharacterized","direct ARMC1 interaction with DRP1, OPA1, or MFN2 has not been tested"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,1]}],"localization":[{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[0,1,3,4]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[0,4]}],"pathway":[{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[0,1,2]}],"complexes":["MICOS/MIB complex"],"partners":["MIRO1","MIRO2","MTFR1","DNAJC11"],"other_free_text":[]},"mechanistic_narrative":"ARMC1 is a peripheral component of the mitochondrial contact site and cristae organizing system (MICOS)/mitochondrial intermembrane space bridging (MIB) complex that regulates mitochondrial distribution and dynamics. It localizes to both the cytosol and the outer mitochondrial membrane, where it partitions between two functionally opposing complexes: a MIRO-ARMC1-MTFR complex that antagonizes retrograde mitochondrial movement, and an ARMC1-DNAJC11 complex that facilitates ARMC1 release from mitochondria, with the balance between these interactions tuning steady-state mitochondrial positioning [PMID:31644573, PMID:40203102]. Loss of ARMC1 causes mitochondrial fragmentation and perinuclear clustering without impairing cristae ultrastructure, respiration, or protein import [PMID:31644573], while ARMC1 overexpression shifts mitochondrial dynamics toward fusion by reducing DRP1 and stabilizing OPA1 and MFN2 [PMID:41153008]."},"prefetch_data":{"uniprot":{"accession":"Q9NVT9","full_name":"Armadillo repeat-containing protein 1","aliases":[],"length_aa":282,"mass_kda":31.3,"function":"In association with mitochondrial contact site and cristae organizing system (MICOS) complex components and mitochondrial outer membrane sorting assembly machinery (SAM) complex components may regulate mitochondrial dynamics playing a role in determining mitochondrial length, distribution and motility","subcellular_location":"Cytoplasm; Mitochondrion; Mitochondrion outer membrane","url":"https://www.uniprot.org/uniprotkb/Q9NVT9/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/ARMC1","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"DNAJC11","stoichiometry":4.0}],"url":"https://opencell.sf.czbiohub.org/search/ARMC1","total_profiled":1310},"omim":[{"mim_id":"620385","title":"ARMADILLO REPEAT-CONTAINING PROTEIN 1; ARMC1","url":"https://www.omim.org/entry/620385"},{"mim_id":"617705","title":"COLON CANCER-ASSOCIATED TRANSCRIPT 1, NONCODING; CCAT1","url":"https://www.omim.org/entry/617705"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Mitochondria","reliability":"Approved"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/ARMC1"},"hgnc":{"alias_symbol":["FLJ10511","Arcp"],"prev_symbol":[]},"alphafold":{"accession":"Q9NVT9","domains":[{"cath_id":"-","chopping":"13-111","consensus_level":"high","plddt":93.3662,"start":13,"end":111},{"cath_id":"3.30.70.100","chopping":"141-222","consensus_level":"high","plddt":91.8689,"start":141,"end":222}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9NVT9","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9NVT9-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9NVT9-F1-predicted_aligned_error_v6.png","plddt_mean":78.56},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=ARMC1","jax_strain_url":"https://www.jax.org/strain/search?query=ARMC1"},"sequence":{"accession":"Q9NVT9","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9NVT9.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9NVT9/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9NVT9"}},"corpus_meta":[{"pmid":"9484229","id":"PMC_9484229","title":"Characterization 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localization with functional consequence (fragmentation, reduced motility), single lab\",\n      \"pmids\": [\"31644573\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"ARMC1 partitions between two distinct mitochondrial protein complexes: (1) MIRO recruits ARMC1, which mediates assembly and stability of the mitochondrial fission regulator MTFR, and MIRO-MTFR complexes specifically antagonize retrograde mitochondrial movement; (2) DNAJC11 facilitates ARMC1 release from mitochondria, balancing its mito-cytoplasmic shuttling. ARMC1 deletion causes perinuclear mitochondrial clustering, and disrupting ARMC1 interaction with DNAJC11 leads to excessive mitochondrially localized ARMC1 and distinct mitochondrial defects.\",\n      \"method\": \"Co-immunoprecipitation, proximity labeling (BioID/AP-MS), ARMC1 knockout with rescue experiments, live-cell imaging of mitochondrial trafficking, domain mutagenesis\",\n      \"journal\": \"Science advances\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (Co-IP, MS interactome, KO rescue, live imaging), rigorous epistasis with MIRO-MTFR and DNAJC11\",\n      \"pmids\": [\"40203102\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Overexpression of ARMC1 in HK-2 renal tubular cells reduces DRP1 (fission) and increases OPA1/MFN2 (fusion), lowers ROS, and reduces fibrosis markers, indicating ARMC1 inhibits mitochondrial fission and thereby suppresses oxidative stress in the context of renal fibrosis.\",\n      \"method\": \"Lentiviral ARMC1 overexpression in HK-2 cells, Western blot for DRP1/OPA1/MFN2/NRF2/SOD1/SOD2, ROS assay, comparison with Drp1 inhibitor Mdivi-1; renal proteomics in adenine nephropathy mouse model\",\n      \"journal\": \"Stem cell research & therapy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — functional OE with multiple molecular readouts, single lab, mechanistic link to DRP1/mitochondrial fission established but indirect\",\n      \"pmids\": [\"41153008\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"In the ARMC subfamily review, ARMC1 is described as an armadillo repeat-containing protein involved in mitochondrial function regulation and associated with the MICOS complex, with interactions documented with over 40 pathways and more than 100 proteins and signaling molecules.\",\n      \"method\": \"Literature review and bioinformatics synthesis of structural and functional data\",\n      \"journal\": \"Frontiers in molecular biosciences\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 — review/bioinformatics synthesis, no direct experiment\",\n      \"pmids\": [\"34912852\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ARMC1 is a dual-localization (cytosol and mitochondria) armadillo repeat-containing protein that shuttles between two distinct mitochondrial complexes: one in which MIRO recruits ARMC1 to assemble and stabilize the fission regulator MTFR (antagonizing retrograde mitochondrial movement), and another in which DNAJC11 releases ARMC1 from mitochondria; the balance of these interactions tunes steady-state mitochondrial distribution, and ARMC1 additionally suppresses mitochondrial fission by opposing DRP1 activity, thereby reducing oxidative stress.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\nI'll systematically classify each paper before extracting discoveries.\n\n**Classification:**\n\nPapers about canonical ARMC1 protein:\n- [21] ARMC Subfamily review — KEEP (covers ARMC1)\n- [23] Wagner et al. 2019 (ArmC1/MICOS/MIB) — KEEP\n- [38] McKenna et al. 2025 (ARMC1/MIRO/MTFR) — KEEP\n- [44] Li et al. 2025 (MSCs/ARMC1/mitochondrial fission) — KEEP\n- [39] Gan et al. 2022 (ARMC1 breast cancer biomarker) — EXCLUDE (expression/biomarker only)\n- [18] Du et al. 2021 (scRNA-seq, ARMC1 listed as expressed) — EXCLUDE (expression correlation)\n- [26] Yang et al. 2021 (oocyte scRNA-seq, ARMC1 listed) — EXCLUDE (expression)\n- [45] Pesca et al. 2025 (gene expression/trauma) — EXCLUDE (expression correlation)\n- [47] Wang et al. 2026 (proteomics/foam cells) — EXCLUDE (expression/proteomic profiling without mechanistic ARMC1 study)\n- [36] Wang et al. 2022 (Jab1/COPS5, ARMC1 correlated) — EXCLUDE (expression correlation)\n- [32] Ashja et al. 2024 (GWAS cattle) — EXCLUDE (GWAS association)\n- [24] Alam et al. 2023 (GWAS Hanwoo) — EXCLUDE (GWAS)\n- [40] Sahoo et al. 2022 (reference gene qPCR) — EXCLUDE (no mechanistic finding)\n- [46] Wang et al. 2026 (ARCP = anhedonia connectome pattern, acronym collision) — EXCLUDE (alias collision)\n- [25] Beets et al. 2019 (ARCP-1 in C. elegans) — EXCLUDE (ARCP-1 is a different C. elegans protein, not ortholog of human ARMC1)\n- [12] Mei et al. 2012 (Arabidopsis CSI1 ARCP) — EXCLUDE (plant protein, symbol collision)\n- [37] Ning et al. 2024 (Arabidopsis ARCP1/2 mRNA capping enzymes) — EXCLUDE (plant, alias collision)\n- [48] Dong et al. 2025 (Spodoptera ARCP) — EXCLUDE (insect gene, symbol collision)\n\nBioPlex/interactome papers that detect ARMC1 interactions:\n- [2 gene2pubmed] BioPlex 2015 — KEEP (AP-MS identifies ARMC1 interactions)\n- [3 gene2pubmed] BioPlex 2.0 2017 — KEEP\n- [7 gene2pubmed] BioPlex 3.0 2021 — KEEP\n- [9 gene2pubmed] OpenCell 2022 — KEEP (endogenous tagging, localization)\n- [11 gene2pubmed] Panorama 2015 — KEEP (co-fractionation MS)\n- [13 gene2pubmed] MitoCoP 2021 — KEEP (mitochondrial proteome)\n- [30 gene2pubmed] Global IMS protease interactome 2019 — KEEP\n- [22 gene2pubmed] SLC25A46/MICOS 2017 — KEEP (MICOS complex)\n- [24 gene2pubmed] Hsp70/JDP interactome 2021 — KEEP (DNAJC11 connection)\n- [5 gene2pubmed] HuRI 2020 — KEEP (binary interactome)\n- [4 gene2pubmed] Rolland 2014 interactome — KEEP\n- [16 gene2pubmed] MAC-tag 2018 — KEEP\n- [23 gene2pubmed] mCF/MS 2022 — KEEP\n- [15 gene2pubmed] Human liver interactome — KEEP\n- [20 gene2pubmed] Ubiquitin signaling landscape — KEEP\n- [21 gene2pubmed] Smoking cessation GWAS — EXCLUDE (GWAS)\n- [28 gene2pubmed] AIDS progression mitochondrial genes — EXCLUDE (GWAS/association)\n- [19 gene2pubmed] Tubulin polymerization TPPP paper — EXCLUDE (no ARMC1 content)\n- [17 gene2pubmed] HuR ubiquitination — EXCLUDE (no ARMC1 content)\n- [18 gene2pubmed] Calmodulin binding proteins — EXCLUDE (no specific ARMC1 finding)\n- [29 gene2pubmed] TRIM67 oligodendrogliomas — EXCLUDE (no ARMC1 mechanism)\n- [27 gene2pubmed] PLEKHA4/Wnt signaling — EXCLUDE (no ARMC1 mechanism)\n- [26 gene2pubmed] CSK/ER breast cancer — EXCLUDE (no ARMC1 mechanism)\n- [25 gene2pubmed] SNV interaction disruption — EXCLUDE (no ARMC1 specific mechanism)\n- [12 gene2pubmed] Childhood obesity GWAS — EXCLUDE (GWAS only)\n- [10 gene2pubmed] Alternative splicing interactome — KEEP (if ARMC1 isoforms featured — general resource, marginal)\n- [1,6,8,14] cDNA/ORFeome libraries — EXCLUDE (sequence resources only)\n\nAll ArCP/NRPS papers [1-17 main corpus except as noted above] — EXCLUDE (ArCP = aryl carrier protein domain in bacteria, complete alias collision with different biochemical entity)\n\nRemaining KEEP papers with actual mechanistic ARMC1 content:\n- **[23 main]** Wagner et al. 2019 — MICOS/MIB association, dual localization, mitochondrial fragmentation\n- **[38 main]** McKenna et al. 2025 — MIRO/MTFR complex, DNAJC11 release, mitochondrial distribution\n- **[44 main]** Li et al. 2025 — ARMC1 upregulation reduces DRP1, promotes OPA1/MFN2, reduces mitochondrial fission\n- **[21 main]** Huang et al. 2021 — ARMC subfamily review with structural/functional info on ARMC1\n- **[2 gene2pubmed]** BioPlex — AP-MS interactome (general resource)\n- **[7 gene2pubmed]** BioPlex 3.0 — AP-MS interactome\n- **[9 gene2pubmed]** OpenCell — localization\n- **[13 gene2pubmed]** MitoCoP — mitochondrial proteome\n- **[22 gene2pubmed]** SLC25A46/MICOS — MICOS complex context\n- **[30 gene2pubmed]** IMS protease interactome (BioID) — MIB complex\n- **[24 gene2pubmed]** Hsp70/JDP — DNAJC11 (DNAJC11 = MIB complex member)\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2019,\n      \"finding\": \"ARMC1 (ArmC1) is a dual-localization protein found in both the cytosol and mitochondria, where it associates with the outer mitochondrial membrane via its carboxy-terminus and co-purifies with components of the mitochondrial contact site and cristae organizing system (MICOS)/mitochondrial intermembrane space bridging (MIB) complex. Its levels are reduced upon MICOS/MIB complex depletion. Loss of ArmC1 results in mitochondrial fragmentation and reduced mitochondrial motility, but no defects in cristae ultrastructure, respiration, or protein import, identifying it as a peripheral MICOS/MIB component required for mitochondrial distribution.\",\n      \"method\": \"Subcellular fractionation, co-immunoprecipitation, immunofluorescence microscopy, siRNA knockdown with live-cell imaging of mitochondrial morphology and motility, proximity ligation assay\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (fractionation, Co-IP, live imaging, KD phenotype) in a single study with clear functional readout\",\n      \"pmids\": [\"31644573\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"ARMC1 partitions between two distinct mitochondrial protein complexes that have opposing effects on mitochondrial distribution. In one complex, the mitochondrial trafficking adaptor MIRO recruits ARMC1, which in turn mediates the assembly and stability of the mitochondrial fission regulator MTFR; MIRO-MTFR complexes specifically antagonize retrograde mitochondrial movement. In a second complex, the MIB/MICOS subunit DNAJC11 facilitates ARMC1 release from mitochondria, limiting mitochondrially localized ARMC1 abundance. ARMC1 deletion causes perinuclear mitochondrial clustering that is not rescued by disrupting MIRO-MTFR assembly alone, whereas disrupting the ARMC1-DNAJC11 interaction leads to excessive mitochondrial ARMC1 and distinct mitochondrial defects, demonstrating that balanced mito-cytoplasmic shuttling of ARMC1 tunes steady-state mitochondrial distribution.\",\n      \"method\": \"AP-MS to identify complex members, co-immunoprecipitation to validate MIRO-ARMC1-MTFR and ARMC1-DNAJC11 interactions, CRISPR knockout and overexpression with live-cell mitochondrial imaging, domain mapping and interaction-disrupting mutants, MTFR stability assays\",\n      \"journal\": \"Science advances\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP, AP-MS, multiple KO/mutant lines with quantitative phenotypic readouts in a single rigorous study\",\n      \"pmids\": [\"40203102\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Mesenchymal stem cell (MSC)-conditioned medium increases ARMC1 protein levels in TGF-β1-treated tubular epithelial cells. ARMC1 overexpression reduces DRP1 (a pro-fission GTPase), enhances OPA1 and MFN2 (pro-fusion proteins), lowers reactive oxygen species, and suppresses fibrosis markers (α-SMA, fibronectin, collagen-I), indicating that ARMC1 shifts mitochondrial dynamics toward fusion and reduces oxidative stress in the context of renal fibrosis.\",\n      \"method\": \"Proteomics of renal tissue (adenine nephropathy model), lentiviral ARMC1 overexpression in HK-2 cells, western blotting for DRP1/OPA1/MFN2/NRF2/SOD1/SOD2, ROS measurement, mitochondrial morphology assessment, cisplatin mouse model with MSC intervention\",\n      \"journal\": \"Stem cell research & therapy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — functional overexpression with multiple molecular readouts but single lab, no reconstitution or direct ARMC1-DRP1 interaction demonstrated\",\n      \"pmids\": [\"41153008\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"ARMC1 is catalogued as a component of the human mitochondrial high-confidence proteome (MitoCoP), placing it among >1,100 proteins with validated mitochondrial localization, with abundance and turnover dynamics consistent with a regulatory rather than structural role.\",\n      \"method\": \"Quantitative mass spectrometry of enriched mitochondrial fractions from human cells, protein half-life measurements\",\n      \"journal\": \"Cell metabolism\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — large-scale quantitative proteomics with rigorous filtering, but ARMC1 is one of many proteins without targeted functional follow-up in this paper\",\n      \"pmids\": [\"34800366\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Endogenous tagging (OpenCell) of ARMC1 by CRISPR-mediated fluorescent knock-in reveals cytoplasmic and mitochondria-associated localization in living human cells, consistent with its dual compartmentalization.\",\n      \"method\": \"CRISPR endogenous tagging with mEGFP, confocal live-cell imaging, AP-MS for interaction partners\",\n      \"journal\": \"Science (New York, N.Y.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — endogenous-tag live imaging is a direct localization experiment; ARMC1-specific interaction data from AP-MS adds functional context\",\n      \"pmids\": [\"35271311\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"BioID proximity labeling of mitochondrial intermembrane space proteases places ARMC1 in proximity to MIB complex components, corroborating its association with this multi-subunit cristae-organizing assembly.\",\n      \"method\": \"In vivo proximity-dependent biotinylation (BioID) followed by mass spectrometry\",\n      \"journal\": \"Proteomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — proximity labeling is indirect; consistent with Co-IP data from independent study (31644573)\",\n      \"pmids\": [\"31617661\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"SLC25A46, a protein that interacts with the MICOS complex (which includes ARMC1 as a component), shows that perturbation of MICOS-associated proteins leads to mitochondrial hyperfusion, providing pathway-level context for ARMC1's role in cristae/outer membrane organization.\",\n      \"method\": \"Co-immunoprecipitation of SLC25A46 with MICOS subunits, siRNA knockdown, mitochondrial morphology imaging\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — ARMC1 is implicated as a MICOS member by association; the paper's primary focus is SLC25A46, not ARMC1 directly\",\n      \"pmids\": [\"28057766\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ARMC1 is a dual-localization protein (cytosol and outer mitochondrial membrane) that functions as a peripheral component of the MICOS/MIB complex and partitions between two distinct complexes: one in which the trafficking adaptor MIRO recruits ARMC1 to stabilize MTFR and antagonize retrograde mitochondrial movement, and another in which DNAJC11 releases ARMC1 from mitochondria; the balance of these interactions tunes steady-state mitochondrial distribution, and ARMC1 additionally shifts mitochondrial dynamics toward fusion by suppressing DRP1 and stabilizing OPA1/MFN2, with its loss causing mitochondrial fragmentation and perinuclear clustering.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"ARMC1 is an armadillo repeat-containing protein that shuttles between the cytosol and the outer mitochondrial membrane and regulates mitochondrial distribution and morphology by partitioning between two distinct mitochondrial complexes. In one complex, MIRO recruits ARMC1 to mediate assembly and stabilization of the fission regulator MTFR, and MIRO–MTFR complexes specifically antagonize retrograde mitochondrial movement; in the other, DNAJC11 facilitates ARMC1 release from mitochondria, balancing its mito-cytoplasmic shuttling [PMID:40203102]. Loss of ARMC1 causes mitochondrial fragmentation, reduced motility, and perinuclear clustering, linking it functionally to the MICOS/MIB complex [PMID:31644573, PMID:40203102]. ARMC1 overexpression suppresses DRP1-dependent mitochondrial fission and reduces reactive oxygen species, consistent with a role in opposing excessive fission and oxidative stress [PMID:41153008].\",\n  \"teleology\": [\n    {\n      \"year\": 2019,\n      \"claim\": \"The first functional characterization established that ARMC1 is a dual-localization protein (cytosol and mitochondria) that associates with the outer mitochondrial membrane and interacts with MICOS/MIB complex components, resolving the question of where it acts and showing that its depletion causes mitochondrial fragmentation and reduced motility.\",\n      \"evidence\": \"Subcellular fractionation, co-immunoprecipitation, live imaging, and siRNA knockdown in mammalian cells\",\n      \"pmids\": [\"31644573\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Single-lab study; independent confirmation in additional cell types needed\",\n        \"Identity of direct binding partners within the MICOS/MIB complex not resolved\",\n        \"Mechanism by which ARMC1 regulates motility versus morphology not distinguished\"\n      ]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Epistasis and interactome mapping resolved ARMC1's mechanism into two distinct complexes: MIRO recruits ARMC1 to assemble/stabilize MTFR and antagonize retrograde transport, while DNAJC11 promotes ARMC1 release from mitochondria, explaining how the balance of these interactions controls mitochondrial distribution.\",\n      \"evidence\": \"Co-immunoprecipitation, BioID/AP-MS proximity labeling, ARMC1 knockout with rescue, live-cell imaging, domain mutagenesis in mammalian cells\",\n      \"pmids\": [\"40203102\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Structural basis of ARMC1 interaction with MIRO versus DNAJC11 unknown\",\n        \"Whether ARMC1 shuttling is regulated by post-translational modifications is untested\",\n        \"Physiological consequence of ARMC1 loss in vivo (whole organism) not established\"\n      ]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"ARMC1 overexpression was shown to suppress DRP1-dependent fission and reduce oxidative stress, extending its role from a trafficking regulator to a modulator of the fission/fusion balance with consequences for cellular redox homeostasis.\",\n      \"evidence\": \"Lentiviral ARMC1 overexpression in HK-2 renal tubular cells with Western blot for DRP1/OPA1/MFN2, ROS assays, and comparison with the DRP1 inhibitor Mdivi-1\",\n      \"pmids\": [\"41153008\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Mechanism linking ARMC1 to DRP1 suppression is indirect; direct physical interaction or signaling intermediary not identified\",\n        \"Findings from a single overexpression system in one cell type; loss-of-function complementation not shown\",\n        \"Relationship between ARMC1's MIRO/MTFR complex role and DRP1 regulation not clarified\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key open questions include the structural basis of ARMC1's armadillo repeat domain engaging MIRO versus DNAJC11, whether post-translational modifications regulate ARMC1 shuttling, and how the MIRO–ARMC1–MTFR axis mechanistically intersects with DRP1-dependent fission.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No structural model of ARMC1 or its complexes exists\",\n        \"In vivo phenotypes of ARMC1 loss in animal models have not been reported\",\n        \"Whether ARMC1 directly modulates DRP1 recruitment or acts through MTFR/MIRO is unresolved\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [0, 1, 2]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [0, 1, 2]}\n    ],\n    \"complexes\": [\n      \"MICOS/MIB complex\"\n    ],\n    \"partners\": [\n      \"RHOT1\",\n      \"RHOT2\",\n      \"DNAJC11\",\n      \"MTFR1\",\n      \"DRP1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"ARMC1 is a peripheral component of the mitochondrial contact site and cristae organizing system (MICOS)/mitochondrial intermembrane space bridging (MIB) complex that regulates mitochondrial distribution and dynamics. It localizes to both the cytosol and the outer mitochondrial membrane, where it partitions between two functionally opposing complexes: a MIRO-ARMC1-MTFR complex that antagonizes retrograde mitochondrial movement, and an ARMC1-DNAJC11 complex that facilitates ARMC1 release from mitochondria, with the balance between these interactions tuning steady-state mitochondrial positioning [PMID:31644573, PMID:40203102]. Loss of ARMC1 causes mitochondrial fragmentation and perinuclear clustering without impairing cristae ultrastructure, respiration, or protein import [PMID:31644573], while ARMC1 overexpression shifts mitochondrial dynamics toward fusion by reducing DRP1 and stabilizing OPA1 and MFN2 [PMID:41153008].\",\n  \"teleology\": [\n    {\n      \"year\": 2017,\n      \"claim\": \"Pathway-level context for ARMC1 emerged from studies of SLC25A46, which showed that perturbation of MICOS-associated proteins alters mitochondrial morphology, implicating MICOS peripheral components in cristae and outer membrane organization.\",\n      \"evidence\": \"Co-IP of SLC25A46 with MICOS subunits and siRNA knockdown with mitochondrial morphology imaging\",\n      \"pmids\": [\"28057766\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"ARMC1 was implicated only by its MICOS membership, not directly studied\", \"no direct interaction between ARMC1 and SLC25A46 was tested\", \"mechanism linking MICOS periphery to morphology control was undefined\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"The first direct functional characterization established that ARMC1 is a dual-localization protein (cytosol and outer mitochondrial membrane) that associates with the MICOS/MIB complex and is required for normal mitochondrial distribution and motility, but not for cristae structure or respiration.\",\n      \"evidence\": \"Subcellular fractionation, co-immunoprecipitation, proximity ligation assay, siRNA knockdown with live-cell imaging of mitochondrial morphology and motility in human cells\",\n      \"pmids\": [\"31644573\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"mechanism by which ARMC1 loss causes fragmentation and reduced motility was unknown\", \"identity of direct ARMC1 binding partners within the MICOS/MIB complex was not resolved\", \"whether ARMC1's cytosolic pool has a distinct function was untested\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Independent proximity labeling corroborated ARMC1's physical association with MIB complex components, strengthening its assignment as a bona fide MICOS/MIB-associated protein.\",\n      \"evidence\": \"BioID proximity-dependent biotinylation followed by mass spectrometry in human cells\",\n      \"pmids\": [\"31617661\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"proximity labeling does not distinguish direct from indirect interactions\", \"stoichiometry and stability of ARMC1 within the MIB complex were not addressed\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Inclusion of ARMC1 in the high-confidence human mitochondrial proteome (MitoCoP) confirmed its mitochondrial residence and indicated regulatory-range abundance and turnover dynamics.\",\n      \"evidence\": \"Quantitative mass spectrometry of enriched mitochondrial fractions with protein half-life measurements\",\n      \"pmids\": [\"34800366\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"no targeted functional analysis of ARMC1 was performed in this dataset\", \"sub-mitochondrial compartmentalization was not resolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Endogenous CRISPR tagging in living cells confirmed ARMC1's dual cytoplasmic and mitochondria-associated localization at physiological expression levels.\",\n      \"evidence\": \"CRISPR-mediated mEGFP knock-in with confocal live-cell imaging and AP-MS\",\n      \"pmids\": [\"35271311\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"dynamics of shuttling between cytosol and mitochondria were not captured\", \"interactome from AP-MS was not functionally validated for ARMC1 specifically\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"The mechanistic basis of ARMC1's role in mitochondrial positioning was resolved: ARMC1 partitions between a MIRO-recruited complex that stabilizes MTFR and antagonizes retrograde transport, and a DNAJC11-mediated complex that releases ARMC1 from mitochondria; balanced shuttling between these states tunes mitochondrial distribution.\",\n      \"evidence\": \"AP-MS, reciprocal co-immunoprecipitation, CRISPR KO and overexpression with live-cell mitochondrial imaging, domain mapping and interaction-disrupting mutants, MTFR stability assays\",\n      \"pmids\": [\"40203102\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"structural basis of ARMC1's armadillo repeats engaging MIRO versus DNAJC11 is unresolved\", \"whether ARMC1 shuttling is actively regulated by post-translational modifications is unknown\", \"contribution of cytosolic ARMC1 pool beyond mitochondrial release is undefined\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"ARMC1 overexpression was shown to shift mitochondrial dynamics toward fusion by reducing DRP1 and stabilizing OPA1/MFN2, linking ARMC1 to the fission–fusion balance and oxidative stress suppression in a disease-relevant model of renal fibrosis.\",\n      \"evidence\": \"Lentiviral ARMC1 overexpression in tubular epithelial cells with western blotting for fission/fusion markers, ROS measurement, and in vivo cisplatin nephropathy model\",\n      \"pmids\": [\"41153008\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"direct physical interaction between ARMC1 and DRP1 or OPA1/MFN2 was not demonstrated\", \"whether the pro-fusion effect reflects ARMC1's normal physiological role or a gain-of-function overexpression artifact is unclear\", \"relevance to tissues beyond kidney epithelium is untested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the armadillo repeat domain of ARMC1 selectively engages its two distinct complexes (MIRO-MTFR versus DNAJC11), whether post-translational modifications regulate this partitioning, and whether ARMC1 directly contacts the fission/fusion machinery remain open questions.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"no structural model of ARMC1 or its interfaces exists\", \"regulation of ARMC1 mito-cytoplasmic shuttling is mechanistically uncharacterized\", \"direct ARMC1 interaction with DRP1, OPA1, or MFN2 has not been tested\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [0, 1, 3, 4]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0, 4]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [0, 1, 2]}\n    ],\n    \"complexes\": [\n      \"MICOS/MIB complex\"\n    ],\n    \"partners\": [\n      \"MIRO1\",\n      \"MIRO2\",\n      \"MTFR1\",\n      \"DNAJC11\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}