{"gene":"ZFYVE1","run_date":"2026-06-11T09:02:06","timeline":{"discoveries":[{"year":2000,"finding":"DFCP1 encodes a 777 amino acid protein containing an N-terminal Cys-His cluster, an ATP/GTP binding site, and two C-terminal FYVE zinc-binding domains; transfection of DFCP1-containing expression construct showed vesicular distribution by confocal microscopy, suggesting involvement in membrane trafficking.","method":"Molecular cloning, sequence analysis, confocal microscopy of transfected cells","journal":"Gene","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, initial characterization with confocal localization but no functional mechanistic follow-up","pmids":["11024279"],"is_preprint":false},{"year":2015,"finding":"Endogenous DFCP1 localizes along Tom20-positive mitochondria under normal conditions and only partially co-localizes with ER or Golgi; under starvation, DFCP1-positive structures become more dotted and some LC3-positive autophagosomes are immunopositive for DFCP1, linking DFCP1 localization to phagophore/omegasome formation.","method":"Immunofluorescence with DFCP1-specific antibody, subcellular co-localization with organelle markers in HeLa cells under normal and starvation conditions","journal":"Biomedical research (Tokyo, Japan)","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — direct localization experiment with endogenous protein using validated antibody, multiple conditions tested, single lab","pmids":["25876663"],"is_preprint":false},{"year":2019,"finding":"DFCP1 redistributes to nascent puncta on the ER upon lipid droplet (LD) induction in a triglyceride synthesis-dependent manner; DFCP1 overexpression increases LD size and enhances ER-LD contacts while knockdown has the opposite effect; DFCP1 acts as a Rab18 effector for LD localization and interacts with the Rab18-ZW10 complex to mediate ER-LD contact formation; fusion and expansion of DFCP1-labeled nascent structures is controlled by BSCL2.","method":"Super-resolution GI-SIM live-cell imaging, DFCP1 overexpression/knockdown, co-immunoprecipitation with Rab18 and ZW10 complex, BSCL2 depletion experiments","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (super-resolution live imaging, Co-IP, gain/loss-of-function), replicated across conditions in a single rigorous study","pmids":["30970241"],"is_preprint":false},{"year":2019,"finding":"DFCP1 localizes to lipid droplets upon oleic acid treatment; the ER-targeted domain is indispensable for LD localization, further enhanced by double FYVE domains; PI3P binding at the FYVE domain (via wortmannin or C654S/C770S double mutation) is NOT required for LD localization, indicating distinct targeting mechanisms for omegasomes vs. LDs; DFCP1 deficiency increases LD number and reduces LD size; DFCP1 interacts with GTP-bound Rab18.","method":"Fluorescence microscopy with domain mutants, wortmannin treatment, DFCP1 knockout MEF cells, co-immunoprecipitation with Rab18","journal":"Cell biology international","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — domain mutagenesis, KO phenotype, and Co-IP in single lab with multiple orthogonal approaches","pmids":["31293035"],"is_preprint":false},{"year":2019,"finding":"ZFYVE1 is a positive regulator of TLR3-mediated signaling; it associates with TLR3 via its FYVE domain (interacting with TLR3 ectodomain), binds poly(I:C), and increases the binding affinity of TLR3 to its ligand poly(I:C), thereby promoting downstream antiviral gene transcription.","method":"Overexpression/knockdown reporter assays, co-immunoprecipitation, domain mapping, ligand binding assay, Zfyve1-/- mouse model","journal":"Cellular & molecular immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP with domain mapping, ligand binding assay, KO mouse phenotype, multiple orthogonal methods in single study","pmids":["31388100"],"is_preprint":false},{"year":2020,"finding":"ZFYVE1 is a specific negative regulator of MDA5- but not RIG-I-mediated innate antiviral responses; ZFYVE1 interacts with MDA5 but not RIG-I, binds viral RNA, and decreases the ligand binding and oligomerization of MDA5; Zfyve1-/- mice are protected from EMCV (MDA5-sensed) but not VSV (RIG-I-sensed) lethality.","method":"Co-immunoprecipitation, viral RNA binding assay, MDA5 oligomerization assay, Zfyve1-/- mouse model with EMCV and VSV challenge, reporter gene assays","journal":"PLoS pathogens","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, in vivo KO mouse with two virus models, RNA binding and oligomerization assays providing multiple orthogonal lines of evidence","pmids":["32251420"],"is_preprint":false},{"year":2023,"finding":"DFCP1 is an ATPase that is activated by membrane binding and dimerizes in an ATP-dependent fashion; DFCP1 is required for autophagic flux of p62 (selective autophagy including aggrephagy, mitophagy, and micronucleophagy) but not bulk autophagy; ATP binding/hydrolysis-defective DFCP1 mutants localize to omegasomes but fail to constrict them properly in a size-dependent manner, causing delayed release of nascent autophagosomes from large omegasomes.","method":"In vitro ATPase assay with membrane binding, dimerization assay, DFCP1 knockout cells, selective autophagy flux assays (p62, mitophagy, aggrephagy, micronucleophagy reporters), ATPase-dead mutant localization and omegasome constriction live imaging","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro biochemical reconstitution of ATPase activity with mutagenesis, KO phenotype with multiple autophagy reporters, live imaging of omegasome dynamics, multiple orthogonal methods","pmids":["37422481"],"is_preprint":false},{"year":2024,"finding":"DFCP1 directly interacts with and recruits ATGL (Adipose Triglyceride Lipase) to lipid droplets in starved cells; this interaction prevents dynamic disassociation of ATGL from LDs and thereby impedes LD lipolysis rate; DFCP1 regulates lipolysis specifically (and lipophagy to a lesser extent), demonstrated by pharmacological inhibition of key LD metabolic enzymes.","method":"Co-immunoprecipitation of DFCP1 with ATGL, pharmacological inhibitor experiments, live-cell LD dynamics assays, ATGL recruitment/retention assays in starved cells","journal":"Journal of lipid research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and functional recruitment assay with pharmacological controls, single lab, multiple approaches","pmids":["39566849"],"is_preprint":false},{"year":2024,"finding":"miR-146b-5p targets DFCP1 and blocks autophagic flux in cardiomyocytes by suppressing DFCP1 expression, contributing to cardiac hypertrophy; this establishes DFCP1 as a required component of autophagic flux downstream of miR-146b-5p in cardiomyocytes.","method":"miR-146b-5p mimic/inhibitor transfection, DFCP1 luciferase target validation, autophagy flux assay, in vitro and in vivo hypertrophy models","journal":"Molecular and cellular endocrinology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — validated miRNA target with functional rescue, in vitro and in vivo models, single lab","pmids":["38649132"],"is_preprint":false},{"year":2025,"finding":"Black carp ZFYVE1 (bcZFYVE1) interacts with IRF3/7 via co-immunoprecipitation, decreases IRF3/7 protein levels (restorable by proteasome inhibitor MG132 or lysosome inhibitor chloroquine), and suppresses IRF3/7-mediated IFN promoter activation and antiviral gene expression; knockdown of bcZFYVE1 reduces SVCV replication.","method":"Co-immunoprecipitation, luciferase reporter assay, overexpression/knockdown, proteasome/lysosome inhibitor treatment, viral replication assay","journal":"Fish & shellfish immunology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, fish ortholog, single Co-IP and reporter assays; not yet validated in mammalian system","pmids":["40250505"],"is_preprint":false}],"current_model":"DFCP1/ZFYVE1 is an ER-resident ATPase with double FYVE domains that functions at multiple membrane interfaces: it drives ATPase-dependent constriction of omegasomes to release autophagosomes specifically during selective autophagy (aggrephagy, mitophagy, micronucleophagy) while having no role in bulk autophagy; it acts as a Rab18 effector to tether ER-lipid droplet contacts for lipid droplet biogenesis and growth, and recruits/retains ATGL on lipid droplets to regulate starvation-driven lipolysis; in innate immunity, it positively regulates TLR3 signaling by enhancing ligand binding and negatively regulates MDA5 signaling by inhibiting MDA5 ligand binding and oligomerization, demonstrating receptor-specific immunomodulatory roles."},"narrative":{"mechanistic_narrative":"ZFYVE1/DFCP1 is an ER-associated protein with tandem C-terminal FYVE zinc-binding domains and a nucleotide-binding region that operates at multiple membrane interfaces governing autophagosome biogenesis, lipid droplet metabolism, and innate antiviral signaling [PMID:11024279, PMID:37422481]. As a membrane-activated ATPase that dimerizes in an ATP-dependent manner, it is selectively required for autophagic flux of p62-marked cargo in aggrephagy, mitophagy, and micronucleophagy but not bulk autophagy; ATP binding/hydrolysis-defective mutants reach omegasomes yet fail to constrict them, delaying release of nascent autophagosomes from large omegasomes [PMID:37422481]. At the ER-lipid droplet interface it acts as an effector of GTP-bound Rab18, engaging the Rab18-ZW10 complex to tether ER-LD contacts and promote LD growth, with its ER-targeting domain rather than FYVE-mediated PI3P binding directing LD localization [PMID:30970241, PMID:31293035]. It further recruits and retains ATGL on lipid droplets in starved cells, restraining lipolysis [PMID:39566849]. In innate immunity ZFYVE1 exerts receptor-specific control, positively regulating TLR3 signaling by binding poly(I:C) and increasing TLR3 ligand affinity through its FYVE domain, while negatively regulating MDA5 by binding viral RNA and impairing MDA5 ligand engagement and oligomerization [PMID:31388100, PMID:32251420].","teleology":[{"year":2000,"claim":"Established the existence and domain architecture of DFCP1, raising the question of what cellular process a double-FYVE, nucleotide-binding protein serves.","evidence":"Molecular cloning, sequence analysis, and confocal imaging of transfected cells","pmids":["11024279"],"confidence":"Low","gaps":["No functional assay linking the protein to a specific pathway","Vesicular localization inferred only from overexpression"]},{"year":2015,"claim":"Showed endogenous DFCP1 associates with mitochondria and redistributes to dotted structures partly overlapping LC3 autophagosomes upon starvation, connecting it to phagophore/omegasome formation.","evidence":"Immunofluorescence of endogenous protein with organelle markers in HeLa cells under normal and starvation conditions","pmids":["25876663"],"confidence":"Medium","gaps":["Co-localization is correlative, not functional","Does not define the molecular role at the omegasome"]},{"year":2019,"claim":"Defined DFCP1 as a Rab18 effector that tethers ER-LD contacts and drives LD growth, establishing a membrane-trafficking role distinct from autophagy.","evidence":"Super-resolution live imaging, gain/loss-of-function, and Co-IP with Rab18 and the ZW10 complex; BSCL2 depletion","pmids":["30970241","31293035"],"confidence":"High","gaps":["Mechanism of how contact tethering promotes triglyceride loading not resolved","Relationship between LD and omegasome pools of DFCP1 not fully mapped"]},{"year":2019,"claim":"Demonstrated receptor-specific immune roles, showing ZFYVE1 binds poly(I:C) and the TLR3 ectodomain via its FYVE domain to enhance TLR3 ligand affinity and antiviral transcription.","evidence":"Reporter assays, reciprocal Co-IP, domain mapping, ligand binding assay, and Zfyve1-/- mouse model","pmids":["31388100"],"confidence":"High","gaps":["Structural basis of FYVE-TLR3 contact unresolved","How the same domain mediates both TLR3 and lipid functions unclear"]},{"year":2020,"claim":"Showed ZFYVE1 selectively restrains MDA5 (not RIG-I) signaling by binding viral RNA and blocking MDA5 ligand engagement and oligomerization, revealing opposing receptor-specific immunomodulation.","evidence":"Co-IP, viral RNA binding and MDA5 oligomerization assays, and Zfyve1-/- mice challenged with EMCV versus VSV","pmids":["32251420"],"confidence":"High","gaps":["How RNA binding discriminates between receptor pathways not defined","Subcellular site of the ZFYVE1-MDA5 interaction unknown"]},{"year":2023,"claim":"Reconstituted DFCP1 as a membrane-activated, ATP-dependent dimerizing ATPase whose hydrolysis constricts omegasomes specifically for selective autophagy, defining its catalytic mechanism.","evidence":"In vitro ATPase and dimerization assays, ATPase-dead mutants, KO cells, and live imaging of omegasome constriction with selective autophagy reporters","pmids":["37422481"],"confidence":"High","gaps":["Physical link between ATPase-driven constriction and membrane scission incomplete","How selectivity for cargo-specific autophagy is achieved not resolved"]},{"year":2024,"claim":"Identified a lipolysis-regulatory function whereby DFCP1 recruits and retains ATGL on lipid droplets in starvation, slowing lipolysis.","evidence":"Co-IP of DFCP1 with ATGL, pharmacological inhibitor experiments, and live-cell LD dynamics assays in starved cells","pmids":["39566849"],"confidence":"Medium","gaps":["Direct binding interface with ATGL not mapped","Integration with the Rab18-dependent LD contact role unclear"]},{"year":2024,"claim":"Placed DFCP1 downstream of miR-146b-5p as a required autophagic-flux component whose suppression contributes to cardiac hypertrophy, linking its function to disease physiology.","evidence":"miRNA mimic/inhibitor transfection, luciferase target validation, autophagy flux assays, and in vitro/in vivo hypertrophy models","pmids":["38649132"],"confidence":"Medium","gaps":["Whether the effect reflects selective versus bulk autophagy not addressed","Direct mechanistic chain from DFCP1 loss to hypertrophy not established"]},{"year":2025,"claim":"Extended antiviral regulation to a fish ortholog interacting with IRF3/7 and reducing their protein levels, hinting at additional regulatory targets.","evidence":"Co-IP, luciferase reporters, overexpression/knockdown, proteasome/lysosome inhibitors, and viral replication assay in black carp (ortholog)","pmids":["40250505"],"confidence":"Low","gaps":["Not validated in mammalian systems","Single Co-IP with reporter assays; degradation mechanism not defined"]},{"year":null,"claim":"How a single ER-associated FYVE-ATPase coordinates its distinct roles in omegasome constriction, ER-LD tethering, and bidirectional innate immune signaling remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model integrating ATPase, FYVE, and RNA/protein-binding activities","Regulatory switches partitioning DFCP1 among autophagy, lipid, and immune functions unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140657","term_label":"ATP-dependent activity","supporting_discovery_ids":[6]},{"term_id":"GO:0016787","term_label":"hydrolase activity","supporting_discovery_ids":[6]},{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[4,5]},{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[2,3]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[4,5,7]}],"localization":[{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[2,3]},{"term_id":"GO:0005811","term_label":"lipid droplet","supporting_discovery_ids":[2,3,7]},{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[1]}],"pathway":[{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[6,8]},{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[2,3,7]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[4,5]}],"complexes":[],"partners":["RAB18","ZW10","ATGL","TLR3","MDA5"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9HBF4","full_name":"Zinc finger FYVE domain-containing protein 1","aliases":["Double FYVE-containing protein 1","SR3","Tandem FYVE fingers-1"],"length_aa":777,"mass_kda":87.2,"function":"Plays a role in the formation of lipid droplets (LDs) which are storage organelles at the center of lipid and energy homeostasis (PubMed:30970241). Regulates the morphology, size and distribution of LDs (PubMed:30970241, PubMed:31293035). Mediates the formation of endoplasmic reticulum-lipid droplets (ER-LD) contacts by forming a complex with RAB18 and ZW10 (PubMed:30970241). Binds to phosphatidylinositol 3-phosphate (PtdIns3P) through FYVE-type zinc finger (PubMed:11256955, PubMed:11739631) (Microbial infection) Upon SARS coronavirus-2/SARS-CoV-2 infection, mediates through binding with non-structural protein 6 (nsp6) the replication organelle-lipid droplet association required to sustain viral replication","subcellular_location":"Golgi apparatus, Golgi stack; Golgi apparatus; Endoplasmic reticulum; Lipid droplet; Preautophagosomal structure; Mitochondrion","url":"https://www.uniprot.org/uniprotkb/Q9HBF4/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/ZFYVE1","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":[],"url":"https://opencell.sf.czbiohub.org/search/ZFYVE1","total_profiled":1310},"omim":[{"mim_id":"621000","title":"SORTING NEXIN 18; SNX18","url":"https://www.omim.org/entry/621000"},{"mim_id":"605471","title":"ZINC FINGER FYVE TYPE-CONTAINING PROTEIN 1; ZFYVE1","url":"https://www.omim.org/entry/605471"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Endoplasmic reticulum","reliability":"Supported"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/ZFYVE1"},"hgnc":{"alias_symbol":["DFCP1","KIAA1589","TAFF1","PPP1R172"],"prev_symbol":["ZNFN2A1"]},"alphafold":{"accession":"Q9HBF4","domains":[{"cath_id":"-","chopping":"33-138","consensus_level":"medium","plddt":76.4343,"start":33,"end":138},{"cath_id":"3.40.50.300","chopping":"152-408","consensus_level":"high","plddt":85.8815,"start":152,"end":408},{"cath_id":"-","chopping":"430-554","consensus_level":"medium","plddt":71.8086,"start":430,"end":554},{"cath_id":"3.30.40.10","chopping":"581-658","consensus_level":"medium","plddt":79.805,"start":581,"end":658},{"cath_id":"3.30.40.10","chopping":"713-773","consensus_level":"high","plddt":84.0785,"start":713,"end":773}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9HBF4","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9HBF4-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9HBF4-F1-predicted_aligned_error_v6.png","plddt_mean":76.31},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=ZFYVE1","jax_strain_url":"https://www.jax.org/strain/search?query=ZFYVE1"},"sequence":{"accession":"Q9HBF4","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9HBF4.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9HBF4/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9HBF4"}},"corpus_meta":[{"pmid":"30970241","id":"PMC_30970241","title":"The ER-Localized Protein DFCP1 Modulates ER-Lipid Droplet Contact Formation.","date":"2019","source":"Cell reports","url":"https://pubmed.ncbi.nlm.nih.gov/30970241","citation_count":90,"is_preprint":false},{"pmid":"37422481","id":"PMC_37422481","title":"ATPase activity of DFCP1 controls selective autophagy.","date":"2023","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/37422481","citation_count":36,"is_preprint":false},{"pmid":"11024279","id":"PMC_11024279","title":"Double FYVE-containing protein 1 (DFCP1): isolation, cloning and characterization of a novel FYVE finger protein from a human bone marrow cDNA library.","date":"2000","source":"Gene","url":"https://pubmed.ncbi.nlm.nih.gov/11024279","citation_count":21,"is_preprint":false},{"pmid":"31293035","id":"PMC_31293035","title":"DFCP1 associates with lipid droplets.","date":"2019","source":"Cell biology international","url":"https://pubmed.ncbi.nlm.nih.gov/31293035","citation_count":20,"is_preprint":false},{"pmid":"32251420","id":"PMC_32251420","title":"ZFYVE1 negatively regulates MDA5- but not RIG-I-mediated innate antiviral response.","date":"2020","source":"PLoS pathogens","url":"https://pubmed.ncbi.nlm.nih.gov/32251420","citation_count":20,"is_preprint":false},{"pmid":"31388100","id":"PMC_31388100","title":"The zinc-finger protein ZFYVE1 modulates TLR3-mediated signaling by facilitating TLR3 ligand binding.","date":"2019","source":"Cellular & molecular immunology","url":"https://pubmed.ncbi.nlm.nih.gov/31388100","citation_count":18,"is_preprint":false},{"pmid":"25876663","id":"PMC_25876663","title":"Cellular localization and tissue distribution of endogenous DFCP1 protein.","date":"2015","source":"Biomedical research (Tokyo, Japan)","url":"https://pubmed.ncbi.nlm.nih.gov/25876663","citation_count":15,"is_preprint":false},{"pmid":"39566849","id":"PMC_39566849","title":"DFCP1 is a regulator of starvation-driven ATGL-mediated lipid droplet lipolysis.","date":"2024","source":"Journal of lipid research","url":"https://pubmed.ncbi.nlm.nih.gov/39566849","citation_count":2,"is_preprint":false},{"pmid":"38649132","id":"PMC_38649132","title":"Inhibition of miR-146b-5p alleviates isoprenaline-induced cardiac hypertrophy via regulating DFCP1.","date":"2024","source":"Molecular and cellular endocrinology","url":"https://pubmed.ncbi.nlm.nih.gov/38649132","citation_count":1,"is_preprint":false},{"pmid":"40250505","id":"PMC_40250505","title":"ZFYVE1 suppresses IRF3/7-mediated antiviral innate immunity in black carp.","date":"2025","source":"Fish & shellfish immunology","url":"https://pubmed.ncbi.nlm.nih.gov/40250505","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":6890,"output_tokens":2886,"usd":0.03198,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":10127,"output_tokens":3279,"usd":0.066305,"stage2_stop_reason":"end_turn"},"total_usd":0.098285,"stage1_batch_id":"msgbatch_01UT1AahFPCAyn2uVweS7A9z","stage2_batch_id":"msgbatch_01HuKWtKNT4Pqj1bc8eEP5RV","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2000,\n      \"finding\": \"DFCP1 encodes a 777 amino acid protein containing an N-terminal Cys-His cluster, an ATP/GTP binding site, and two C-terminal FYVE zinc-binding domains; transfection of DFCP1-containing expression construct showed vesicular distribution by confocal microscopy, suggesting involvement in membrane trafficking.\",\n      \"method\": \"Molecular cloning, sequence analysis, confocal microscopy of transfected cells\",\n      \"journal\": \"Gene\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, initial characterization with confocal localization but no functional mechanistic follow-up\",\n      \"pmids\": [\"11024279\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Endogenous DFCP1 localizes along Tom20-positive mitochondria under normal conditions and only partially co-localizes with ER or Golgi; under starvation, DFCP1-positive structures become more dotted and some LC3-positive autophagosomes are immunopositive for DFCP1, linking DFCP1 localization to phagophore/omegasome formation.\",\n      \"method\": \"Immunofluorescence with DFCP1-specific antibody, subcellular co-localization with organelle markers in HeLa cells under normal and starvation conditions\",\n      \"journal\": \"Biomedical research (Tokyo, Japan)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — direct localization experiment with endogenous protein using validated antibody, multiple conditions tested, single lab\",\n      \"pmids\": [\"25876663\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"DFCP1 redistributes to nascent puncta on the ER upon lipid droplet (LD) induction in a triglyceride synthesis-dependent manner; DFCP1 overexpression increases LD size and enhances ER-LD contacts while knockdown has the opposite effect; DFCP1 acts as a Rab18 effector for LD localization and interacts with the Rab18-ZW10 complex to mediate ER-LD contact formation; fusion and expansion of DFCP1-labeled nascent structures is controlled by BSCL2.\",\n      \"method\": \"Super-resolution GI-SIM live-cell imaging, DFCP1 overexpression/knockdown, co-immunoprecipitation with Rab18 and ZW10 complex, BSCL2 depletion experiments\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (super-resolution live imaging, Co-IP, gain/loss-of-function), replicated across conditions in a single rigorous study\",\n      \"pmids\": [\"30970241\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"DFCP1 localizes to lipid droplets upon oleic acid treatment; the ER-targeted domain is indispensable for LD localization, further enhanced by double FYVE domains; PI3P binding at the FYVE domain (via wortmannin or C654S/C770S double mutation) is NOT required for LD localization, indicating distinct targeting mechanisms for omegasomes vs. LDs; DFCP1 deficiency increases LD number and reduces LD size; DFCP1 interacts with GTP-bound Rab18.\",\n      \"method\": \"Fluorescence microscopy with domain mutants, wortmannin treatment, DFCP1 knockout MEF cells, co-immunoprecipitation with Rab18\",\n      \"journal\": \"Cell biology international\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — domain mutagenesis, KO phenotype, and Co-IP in single lab with multiple orthogonal approaches\",\n      \"pmids\": [\"31293035\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"ZFYVE1 is a positive regulator of TLR3-mediated signaling; it associates with TLR3 via its FYVE domain (interacting with TLR3 ectodomain), binds poly(I:C), and increases the binding affinity of TLR3 to its ligand poly(I:C), thereby promoting downstream antiviral gene transcription.\",\n      \"method\": \"Overexpression/knockdown reporter assays, co-immunoprecipitation, domain mapping, ligand binding assay, Zfyve1-/- mouse model\",\n      \"journal\": \"Cellular & molecular immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP with domain mapping, ligand binding assay, KO mouse phenotype, multiple orthogonal methods in single study\",\n      \"pmids\": [\"31388100\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"ZFYVE1 is a specific negative regulator of MDA5- but not RIG-I-mediated innate antiviral responses; ZFYVE1 interacts with MDA5 but not RIG-I, binds viral RNA, and decreases the ligand binding and oligomerization of MDA5; Zfyve1-/- mice are protected from EMCV (MDA5-sensed) but not VSV (RIG-I-sensed) lethality.\",\n      \"method\": \"Co-immunoprecipitation, viral RNA binding assay, MDA5 oligomerization assay, Zfyve1-/- mouse model with EMCV and VSV challenge, reporter gene assays\",\n      \"journal\": \"PLoS pathogens\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, in vivo KO mouse with two virus models, RNA binding and oligomerization assays providing multiple orthogonal lines of evidence\",\n      \"pmids\": [\"32251420\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"DFCP1 is an ATPase that is activated by membrane binding and dimerizes in an ATP-dependent fashion; DFCP1 is required for autophagic flux of p62 (selective autophagy including aggrephagy, mitophagy, and micronucleophagy) but not bulk autophagy; ATP binding/hydrolysis-defective DFCP1 mutants localize to omegasomes but fail to constrict them properly in a size-dependent manner, causing delayed release of nascent autophagosomes from large omegasomes.\",\n      \"method\": \"In vitro ATPase assay with membrane binding, dimerization assay, DFCP1 knockout cells, selective autophagy flux assays (p62, mitophagy, aggrephagy, micronucleophagy reporters), ATPase-dead mutant localization and omegasome constriction live imaging\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro biochemical reconstitution of ATPase activity with mutagenesis, KO phenotype with multiple autophagy reporters, live imaging of omegasome dynamics, multiple orthogonal methods\",\n      \"pmids\": [\"37422481\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"DFCP1 directly interacts with and recruits ATGL (Adipose Triglyceride Lipase) to lipid droplets in starved cells; this interaction prevents dynamic disassociation of ATGL from LDs and thereby impedes LD lipolysis rate; DFCP1 regulates lipolysis specifically (and lipophagy to a lesser extent), demonstrated by pharmacological inhibition of key LD metabolic enzymes.\",\n      \"method\": \"Co-immunoprecipitation of DFCP1 with ATGL, pharmacological inhibitor experiments, live-cell LD dynamics assays, ATGL recruitment/retention assays in starved cells\",\n      \"journal\": \"Journal of lipid research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and functional recruitment assay with pharmacological controls, single lab, multiple approaches\",\n      \"pmids\": [\"39566849\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"miR-146b-5p targets DFCP1 and blocks autophagic flux in cardiomyocytes by suppressing DFCP1 expression, contributing to cardiac hypertrophy; this establishes DFCP1 as a required component of autophagic flux downstream of miR-146b-5p in cardiomyocytes.\",\n      \"method\": \"miR-146b-5p mimic/inhibitor transfection, DFCP1 luciferase target validation, autophagy flux assay, in vitro and in vivo hypertrophy models\",\n      \"journal\": \"Molecular and cellular endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — validated miRNA target with functional rescue, in vitro and in vivo models, single lab\",\n      \"pmids\": [\"38649132\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Black carp ZFYVE1 (bcZFYVE1) interacts with IRF3/7 via co-immunoprecipitation, decreases IRF3/7 protein levels (restorable by proteasome inhibitor MG132 or lysosome inhibitor chloroquine), and suppresses IRF3/7-mediated IFN promoter activation and antiviral gene expression; knockdown of bcZFYVE1 reduces SVCV replication.\",\n      \"method\": \"Co-immunoprecipitation, luciferase reporter assay, overexpression/knockdown, proteasome/lysosome inhibitor treatment, viral replication assay\",\n      \"journal\": \"Fish & shellfish immunology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, fish ortholog, single Co-IP and reporter assays; not yet validated in mammalian system\",\n      \"pmids\": [\"40250505\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"DFCP1/ZFYVE1 is an ER-resident ATPase with double FYVE domains that functions at multiple membrane interfaces: it drives ATPase-dependent constriction of omegasomes to release autophagosomes specifically during selective autophagy (aggrephagy, mitophagy, micronucleophagy) while having no role in bulk autophagy; it acts as a Rab18 effector to tether ER-lipid droplet contacts for lipid droplet biogenesis and growth, and recruits/retains ATGL on lipid droplets to regulate starvation-driven lipolysis; in innate immunity, it positively regulates TLR3 signaling by enhancing ligand binding and negatively regulates MDA5 signaling by inhibiting MDA5 ligand binding and oligomerization, demonstrating receptor-specific immunomodulatory roles.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"ZFYVE1/DFCP1 is an ER-associated protein with tandem C-terminal FYVE zinc-binding domains and a nucleotide-binding region that operates at multiple membrane interfaces governing autophagosome biogenesis, lipid droplet metabolism, and innate antiviral signaling [#0, #6]. As a membrane-activated ATPase that dimerizes in an ATP-dependent manner, it is selectively required for autophagic flux of p62-marked cargo in aggrephagy, mitophagy, and micronucleophagy but not bulk autophagy; ATP binding/hydrolysis-defective mutants reach omegasomes yet fail to constrict them, delaying release of nascent autophagosomes from large omegasomes [#6]. At the ER-lipid droplet interface it acts as an effector of GTP-bound Rab18, engaging the Rab18-ZW10 complex to tether ER-LD contacts and promote LD growth, with its ER-targeting domain rather than FYVE-mediated PI3P binding directing LD localization [#2, #3]. It further recruits and retains ATGL on lipid droplets in starved cells, restraining lipolysis [#7]. In innate immunity ZFYVE1 exerts receptor-specific control, positively regulating TLR3 signaling by binding poly(I:C) and increasing TLR3 ligand affinity through its FYVE domain, while negatively regulating MDA5 by binding viral RNA and impairing MDA5 ligand engagement and oligomerization [#4, #5].\",\n  \"teleology\": [\n    {\n      \"year\": 2000,\n      \"claim\": \"Established the existence and domain architecture of DFCP1, raising the question of what cellular process a double-FYVE, nucleotide-binding protein serves.\",\n      \"evidence\": \"Molecular cloning, sequence analysis, and confocal imaging of transfected cells\",\n      \"pmids\": [\"11024279\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No functional assay linking the protein to a specific pathway\", \"Vesicular localization inferred only from overexpression\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Showed endogenous DFCP1 associates with mitochondria and redistributes to dotted structures partly overlapping LC3 autophagosomes upon starvation, connecting it to phagophore/omegasome formation.\",\n      \"evidence\": \"Immunofluorescence of endogenous protein with organelle markers in HeLa cells under normal and starvation conditions\",\n      \"pmids\": [\"25876663\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Co-localization is correlative, not functional\", \"Does not define the molecular role at the omegasome\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Defined DFCP1 as a Rab18 effector that tethers ER-LD contacts and drives LD growth, establishing a membrane-trafficking role distinct from autophagy.\",\n      \"evidence\": \"Super-resolution live imaging, gain/loss-of-function, and Co-IP with Rab18 and the ZW10 complex; BSCL2 depletion\",\n      \"pmids\": [\"30970241\", \"31293035\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of how contact tethering promotes triglyceride loading not resolved\", \"Relationship between LD and omegasome pools of DFCP1 not fully mapped\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Demonstrated receptor-specific immune roles, showing ZFYVE1 binds poly(I:C) and the TLR3 ectodomain via its FYVE domain to enhance TLR3 ligand affinity and antiviral transcription.\",\n      \"evidence\": \"Reporter assays, reciprocal Co-IP, domain mapping, ligand binding assay, and Zfyve1-/- mouse model\",\n      \"pmids\": [\"31388100\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of FYVE-TLR3 contact unresolved\", \"How the same domain mediates both TLR3 and lipid functions unclear\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Showed ZFYVE1 selectively restrains MDA5 (not RIG-I) signaling by binding viral RNA and blocking MDA5 ligand engagement and oligomerization, revealing opposing receptor-specific immunomodulation.\",\n      \"evidence\": \"Co-IP, viral RNA binding and MDA5 oligomerization assays, and Zfyve1-/- mice challenged with EMCV versus VSV\",\n      \"pmids\": [\"32251420\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How RNA binding discriminates between receptor pathways not defined\", \"Subcellular site of the ZFYVE1-MDA5 interaction unknown\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Reconstituted DFCP1 as a membrane-activated, ATP-dependent dimerizing ATPase whose hydrolysis constricts omegasomes specifically for selective autophagy, defining its catalytic mechanism.\",\n      \"evidence\": \"In vitro ATPase and dimerization assays, ATPase-dead mutants, KO cells, and live imaging of omegasome constriction with selective autophagy reporters\",\n      \"pmids\": [\"37422481\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physical link between ATPase-driven constriction and membrane scission incomplete\", \"How selectivity for cargo-specific autophagy is achieved not resolved\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Identified a lipolysis-regulatory function whereby DFCP1 recruits and retains ATGL on lipid droplets in starvation, slowing lipolysis.\",\n      \"evidence\": \"Co-IP of DFCP1 with ATGL, pharmacological inhibitor experiments, and live-cell LD dynamics assays in starved cells\",\n      \"pmids\": [\"39566849\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct binding interface with ATGL not mapped\", \"Integration with the Rab18-dependent LD contact role unclear\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Placed DFCP1 downstream of miR-146b-5p as a required autophagic-flux component whose suppression contributes to cardiac hypertrophy, linking its function to disease physiology.\",\n      \"evidence\": \"miRNA mimic/inhibitor transfection, luciferase target validation, autophagy flux assays, and in vitro/in vivo hypertrophy models\",\n      \"pmids\": [\"38649132\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether the effect reflects selective versus bulk autophagy not addressed\", \"Direct mechanistic chain from DFCP1 loss to hypertrophy not established\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Extended antiviral regulation to a fish ortholog interacting with IRF3/7 and reducing their protein levels, hinting at additional regulatory targets.\",\n      \"evidence\": \"Co-IP, luciferase reporters, overexpression/knockdown, proteasome/lysosome inhibitors, and viral replication assay in black carp (ortholog)\",\n      \"pmids\": [\"40250505\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Not validated in mammalian systems\", \"Single Co-IP with reporter assays; degradation mechanism not defined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How a single ER-associated FYVE-ATPase coordinates its distinct roles in omegasome constriction, ER-LD tethering, and bidirectional innate immune signaling remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural model integrating ATPase, FYVE, and RNA/protein-binding activities\", \"Regulatory switches partitioning DFCP1 among autophagy, lipid, and immune functions unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140657\", \"supporting_discovery_ids\": [6]},\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [6]},\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [4, 5]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [2, 3]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [4, 5, 7]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [2, 3]},\n      {\"term_id\": \"GO:0005811\", \"supporting_discovery_ids\": [2, 3, 7]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [6, 8]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [2, 3, 7]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [4, 5]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"RAB18\", \"ZW10\", \"ATGL\", \"TLR3\", \"MDA5\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}