{"gene":"PFDN1","run_date":"2026-06-10T05:19:53","timeline":{"discoveries":[{"year":2003,"finding":"PFDN1 (PFD1) is one of six subunits that can spontaneously assemble into a functional heterohexameric prefoldin complex in vitro. The distal tip of the PFD1-containing tentacle is required to form binary complexes with target proteins (actin and tubulins). Different but overlapping sets of subunit tips mediate binding to actin versus alpha- and beta-tubulin.","method":"In vitro reconstitution of recombinant prefoldin subunits, engineered truncation variants, binary complex formation assays with actin and tubulin substrates","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with mutagenesis/engineered variants, multiple orthogonal binding assays, rigorous mechanistic dissection of subunit contributions","pmids":["14634002"],"is_preprint":false},{"year":2007,"finding":"In C. elegans, prefoldin subunit 1 (pfd-1) is required for efficient tubulin biogenesis. Loss of pfd-1 reduces alpha-tubulin levels and microtubule growth rate, causing embryonic cell division defects and gonadogenesis/distal tip cell migration defects. RNAi of prefoldin, CCT, or tubulin phenocopies the pfd-1 cell migration defect, placing PFDN1 upstream of tubulin folding in the prefoldin–CCT pathway.","method":"RNAi knockdown, pfd-1 null mutant analysis, immunofluorescence, microtubule dynamics measurement, genetic epistasis (phenocopy experiments)","journal":"Developmental biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean null mutant + RNAi with defined cellular phenotypes, genetic epistasis to CCT and tubulin, replicated across multiple developmental contexts","pmids":["18062952"],"is_preprint":false},{"year":2008,"finding":"Pfdn1-null mice display defects in cytoskeletal function manifesting as ciliary dyskinesia, neuronal loss, and impaired B and T lymphocyte development. B cell maturation is blocked at the pre-pro-B to pre-B transition and T cell maturation at the DN to DP transition. Mature lymphocytes show impaired antigen receptor capping, a cytoskeleton-dependent process, upon BCR cross-linking.","method":"Pfdn1 knockout mouse model, flow cytometry, B/T cell developmental staging, antigen receptor capping assay","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean knockout mouse with multiple defined cellular phenotypes, mechanistically linked to cytoskeletal function","pmids":["18566413"],"is_preprint":false},{"year":2011,"finding":"Prefoldin subunits are protected from ubiquitin-proteasome system (UPS)-mediated degradation by incorporation into the hexameric complex. Knockdown of one subunit decreases protein levels of other subunits. Overexpressed (monomeric) PFD subunits are degraded by the UPS, while endogenous subunits incorporated into the complex are not. There are specific pairwise stabilization relationships among subunits.","method":"siRNA knockdown of individual subunits, proteasome inhibitor (MG132) treatment, co-transfection and co-immunoprecipitation, Western blotting","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal knockdown and pharmacological inhibition with functional readout, single lab, multiple subunit combinations tested","pmids":["21478150"],"is_preprint":false},{"year":2013,"finding":"The prefoldin complex (requiring PFD1 as a component) suppresses polyglutamine-expanded Huntingtin (HTT) aggregation at the small oligomer (dimer-to-tetramer) stage in vitro, as demonstrated by single-molecule observation. Knockdown of PFD2 and PFD5 (which disrupts the complex including PFD1) increases soluble HTT oligomer size and induces cell death in HTT-expressing cells.","method":"Fluorescence correlation spectroscopy, single-molecule fluorescence observation in vitro, siRNA knockdown of PFD subunits, cell viability assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro single-molecule reconstitution with mechanistic resolution, but PFD1's individual contribution is inferred from complex disruption rather than direct PFD1-specific experiment","pmids":["23720755"],"is_preprint":false},{"year":2013,"finding":"Prefoldin (including PFD1 as a constituent subunit) co-localizes with polyubiquitinated proteins in cytoplasmic dots. Knockdown of prefoldin increases SDS-insoluble ubiquitinated protein levels and reduces cell viability under proteasome inhibition (lactacystin) or ER stress (thapsigargin), while overexpression has the opposite effect, establishing prefoldin as a clearance factor preventing pathological protein aggregation.","method":"Anti-prefoldin monoclonal antibody, immunofluorescence co-localization, siRNA knockdown, proteasome inhibitor and ER stress treatment, cell viability assay, SDS-PAGE/Western blotting for insoluble ubiquitinated proteins","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-localization plus loss- and gain-of-function with defined biochemical readouts, single lab","pmids":["23946485"],"is_preprint":false},{"year":2014,"finding":"The prefoldin complex (with PFD1 as a subunit) co-localizes with aggregated alpha-synuclein in lysosomes. Knockdown of PFD2 and PFD5 (disrupting the prefoldin complex) increases alpha-synuclein aggregate accumulation and cell death, demonstrating that intact prefoldin (requiring all subunits including PFD1) protects against alpha-synuclein aggregation-induced toxicity.","method":"Fluorescence microscopy, co-localization, siRNA knockdown of prefoldin subunits, cell viability assay in Neuro-2a cells","journal":"Brain research","confidence":"Low","confidence_rationale":"Tier 3 / Moderate — PFD1's specific contribution inferred from complex disruption via other subunits, single lab, co-localization without direct mechanistic dissection of PFD1","pmids":["24511594"],"is_preprint":false},{"year":2015,"finding":"PFDN1 subcellular distribution is altered during rabies virus (RABV) infection: PFDN1 is recruited to Negri-Body-Like (NBL) structures in the cytoplasm and co-localizes with the RABV nucleoprotein (N protein). Co-transfection of both N and P genes of RABV is required to reproduce this redistribution; transfection of N or P gene alone does not recapitulate the full redistribution.","method":"Confocal microscopy, co-localization analysis in RABV-infected and plasmid-transfected N2a cells","journal":"Jundishapur journal of microbiology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, co-localization by confocal microscopy only, no functional consequence or binding assay demonstrated","pmids":["26421138"],"is_preprint":false},{"year":2016,"finding":"PFDN1 is upregulated during TGF-β1-induced EMT and translocates to the nucleus in lung cancer cells. Nuclear PFDN1 directly binds to the cyclin A promoter at the transcriptional start site to suppress cyclin A expression. PFDN1 overexpression induces EMT and invasion; cyclin A overexpression rescues these effects, establishing a TGF-β1/PFDN1/cyclin A axis in EMT.","method":"Overexpression and knockdown (siRNA), Western blotting, invasion assay, chromatin immunoprecipitation (ChIP) for PFDN1 at cyclin A promoter, rescue experiment with cyclin A overexpression, xenograft tumor model","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP demonstrating direct promoter binding, reciprocal gain/loss-of-function, rescue epistasis experiment, in vivo xenograft validation, multiple orthogonal methods","pmids":["27694898"],"is_preprint":false},{"year":2001,"finding":"PFDN1 was identified as a potential binding partner of the glioma-amplified nuclear protein GAS41 by yeast two-hybrid screening.","method":"Yeast two-hybrid screening","journal":"Oncogene","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single yeast two-hybrid screen only, no biochemical validation of direct interaction reported in abstract","pmids":["11521196"],"is_preprint":false},{"year":2021,"finding":"PFDN1 is a novel binding partner of FILIP1L at centrosomes throughout mitosis. FILIP1L is required for proper centrosomal localization of PFDN1 and regulates proteasome-dependent degradation of PFDN1. Increased PFDN1 caused by FILIP1L loss drives multinucleation and cytokinesis defects in vitro and in vivo.","method":"Co-immunoprecipitation, confocal microscopy (centrosome co-localization), time-lapse imaging, 3D cultures, FILIP1L knockout mouse model, xenograft","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, direct localization with functional consequence, loss-of-function in vitro and in vivo, time-lapse imaging of cytokinesis defects, multiple orthogonal methods","pmids":["34417201"],"is_preprint":false},{"year":2022,"finding":"In lung adenocarcinoma, loss of FILIP1L leads to increased PFDN1 (its binding partner), which is associated with increased mucin secretion, proliferation, inflammation, and fibrosis, and upregulated Wnt/β-catenin signaling.","method":"Lung-specific FILIP1L knockout mice, syngeneic allograft tumors, RNA-sequencing, xenograft","journal":"Cancer research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo knockout model with pathway analysis, but PFDN1's specific mechanistic contribution is inferred from FILIP1L loss context rather than direct PFDN1 manipulation","pmids":["36860703"],"is_preprint":false},{"year":2025,"finding":"PFDN1 silencing in triple-negative breast cancer (MDA-MB-231) cells causes G2/M cell cycle arrest, increased early apoptosis, impaired migration (wound healing), and reduced colony formation. Transcriptome profiling revealed downregulation of angiogenesis (KDR, TEK), EMT (FOXC2, SNAI1), and hypoxia (CA9, EPO) genes, and upregulation of proapoptotic FASLG.","method":"siRNA knockdown, flow cytometry (cell cycle and apoptosis), wound healing assay, colony formation assay, SEM, qRT-PCR array (84-gene cancer panel)","journal":"Naunyn-Schmiedeberg's archives of pharmacology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function with multiple defined cellular phenotypes and transcriptome readout, single lab, no rescue or direct mechanistic target validation beyond expression changes","pmids":["40063241"],"is_preprint":false}],"current_model":"PFDN1 is one of six subunits of the heterohexameric prefoldin co-chaperone complex, where it contributes distal tentacle-tip contacts required for binding nascent actin and tubulin monomers for delivery to the CCT/TRiC chaperonin; beyond this canonical cytoplasmic role, PFDN1 translocates to the nucleus during TGF-β1-induced EMT to directly bind the cyclin A promoter and suppress its transcription, localizes to centrosomes where its stability is controlled by FILIP1L-mediated proteasomal degradation, and its excess at centrosomes drives cytokinesis defects and aneuploidy; prefoldin subunit stoichiometry is maintained by UPS-mediated degradation of unassembled monomers, and the intact complex suppresses pathological aggregation of polyglutamine-expanded huntingtin and alpha-synuclein."},"narrative":{"mechanistic_narrative":"PFDN1 is one of six subunits of the heterohexameric prefoldin co-chaperone complex, where the distal tip of the PFDN1-containing tentacle forms binary complexes with nascent actin and tubulin for delivery into the folding pathway, with overlapping subunit-tip sets distinguishing actin from alpha- and beta-tubulin binding [PMID:14634002]. Consistent with this cytoskeletal role, loss of PFDN1 reduces tubulin levels and microtubule growth and places it genetically upstream of CCT and tubulin folding [PMID:18062952], and Pfdn1-null mice show cytoskeleton-dependent defects including ciliary dyskinesia, neuronal loss, and blocked B and T lymphocyte maturation with impaired antigen-receptor capping [PMID:18566413]. Subunit stoichiometry is enforced by the ubiquitin-proteasome system, which degrades unassembled monomers while complex-incorporated subunits are protected, so depletion of one subunit lowers the others [PMID:21478150]. The intact complex acts as a clearance factor that suppresses pathological protein aggregation, blocking polyglutamine-expanded huntingtin at the small-oligomer stage [PMID:23720755] and co-localizing with polyubiquitinated aggregates to limit insoluble protein accumulation under proteasome and ER stress [PMID:23946485]. Beyond chaperone function, PFDN1 is upregulated during TGF-β1-induced EMT and translocates to the nucleus, where it binds the cyclin A promoter to repress cyclin A and drive EMT and invasion in lung cancer, an effect rescued by cyclin A re-expression [PMID:27694898]; at centrosomes its abundance is set by FILIP1L-dependent proteasomal degradation, and excess PFDN1 produces multinucleation and cytokinesis defects [PMID:34417201].","teleology":[{"year":2003,"claim":"Established the molecular basis of substrate capture by defining PFDN1 as a structural subunit whose tentacle tip mediates direct binding of actin and tubulin within the assembled prefoldin complex.","evidence":"In vitro reconstitution of recombinant subunits with engineered truncations and binary complex binding assays","pmids":["14634002"],"confidence":"High","gaps":["Does not establish in vivo handoff kinetics to CCT/TRiC","Does not define PFDN1's contribution to native complex assembly in cells"]},{"year":2003,"claim":"Placed PFDN1 functionally upstream of tubulin folding in vivo, showing its loss limits tubulin biogenesis and microtubule-dependent cellular processes.","evidence":"C. elegans pfd-1 null and RNAi with microtubule dynamics measurement and genetic epistasis to CCT and tubulin","pmids":["18062952"],"confidence":"High","gaps":["Does not resolve whether actin folding contributes to the migration phenotype","Worm phenotypes not directly mapped to mammalian tissues"]},{"year":2008,"claim":"Demonstrated the organismal consequences of PFDN1 loss, linking its cytoskeletal chaperone role to ciliary, neuronal, and lymphocyte-development phenotypes.","evidence":"Pfdn1 knockout mouse with flow-cytometric developmental staging and antigen-receptor capping assay","pmids":["18566413"],"confidence":"High","gaps":["Does not separate cell-autonomous from systemic effects","Molecular link between tubulin/actin folding and capping not directly shown"]},{"year":2011,"claim":"Explained how prefoldin stoichiometry is maintained, showing unassembled subunits are degraded by the UPS while complex incorporation confers protection.","evidence":"Reciprocal siRNA knockdown, MG132 treatment, and co-IP across subunit combinations","pmids":["21478150"],"confidence":"Medium","gaps":["E3 ligase mediating monomer turnover not identified","Single lab; degradation signal on PFDN1 not mapped"]},{"year":2014,"claim":"Extended prefoldin function beyond folding to active suppression of disease-associated aggregation, capturing huntingtin at the small-oligomer stage and limiting alpha-synuclein and ubiquitinated-protein accumulation.","evidence":"Single-molecule fluorescence in vitro, co-localization, and subunit knockdown with viability readouts","pmids":["23720755","23946485","24511594"],"confidence":"Medium","gaps":["PFDN1-specific contribution inferred from disruption of other subunits","Mechanism of oligomer recognition not defined"]},{"year":2016,"claim":"Revealed a non-canonical nuclear function in which PFDN1 acts as a direct transcriptional repressor of cyclin A to drive TGF-β1-induced EMT and invasion.","evidence":"ChIP at the cyclin A promoter, reciprocal gain/loss-of-function, cyclin A rescue, and xenograft","pmids":["27694898"],"confidence":"High","gaps":["How nuclear translocation is triggered is unknown","Whether PFDN1 acts alone or within a transcriptional complex at the promoter is unresolved"]},{"year":2021,"claim":"Identified FILIP1L as a centrosomal partner controlling PFDN1 localization and proteasomal turnover, linking PFDN1 dosage to faithful cytokinesis.","evidence":"Reciprocal Co-IP, centrosomal co-localization, time-lapse imaging, and FILIP1L knockout mouse/xenograft","pmids":["34417201","36860703"],"confidence":"High","gaps":["The E3 ligase acting on centrosomal PFDN1 is not identified","Mechanistic link from excess PFDN1 to Wnt/β-catenin activation is inferred from FILIP1L loss"]},{"year":2025,"claim":"Reinforced PFDN1 as a pro-tumorigenic factor in breast cancer, with silencing causing G2/M arrest, apoptosis, and downregulation of angiogenesis/EMT/hypoxia programs.","evidence":"siRNA knockdown with cell-cycle/apoptosis flow cytometry, migration/colony assays, and a 84-gene qRT-PCR array","pmids":["40063241"],"confidence":"Medium","gaps":["No rescue or direct target validation beyond expression changes","Whether effects are chaperone- or transcription-dependent not resolved"]},{"year":null,"claim":"How PFDN1 partitions between its cytoplasmic chaperone, centrosomal, and nuclear transcriptional roles, and what signals govern these switches, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural or regulatory model for PFDN1 nuclear import","The trigger redistributing PFDN1 among compartments is undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0044183","term_label":"protein folding chaperone","supporting_discovery_ids":[0,1]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[0]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[8]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[8]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[0,5]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[8]},{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[10]}],"pathway":[{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[0,1,3]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[8]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[10,12]}],"complexes":["prefoldin complex"],"partners":["CCT/TRIC","FILIP1L","GAS41"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"O60925","full_name":"Prefoldin subunit 1","aliases":[],"length_aa":122,"mass_kda":14.2,"function":"Binds specifically to cytosolic chaperonin (c-CPN) and transfers target proteins to it. Binds to nascent polypeptide chain and promotes folding in an environment in which there are many competing pathways for nonnative proteins","subcellular_location":"","url":"https://www.uniprot.org/uniprotkb/O60925/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/PFDN1","classification":"Common 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membrane","reliability":"Approved"},{"location":"Cytosol","reliability":"Approved"},{"location":"Nucleoli","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/PFDN1"},"hgnc":{"alias_symbol":["PFD1"],"prev_symbol":[]},"alphafold":{"accession":"O60925","domains":[{"cath_id":"1.10.287.370","chopping":"3-120","consensus_level":"high","plddt":94.1418,"start":3,"end":120}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O60925","model_url":"https://alphafold.ebi.ac.uk/files/AF-O60925-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O60925-F1-predicted_aligned_error_v6.png","plddt_mean":93.06},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=PFDN1","jax_strain_url":"https://www.jax.org/strain/search?query=PFDN1"},"sequence":{"accession":"O60925","fasta_url":"https://rest.uniprot.org/uniprotkb/O60925.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O60925/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O60925"}},"corpus_meta":[{"pmid":"21395886","id":"PMC_21395886","title":"A critical role of autophagy in plant 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chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/38925325","citation_count":1,"is_preprint":false},{"pmid":"41885368","id":"PMC_41885368","title":"Transcriptional profiling of circulating extracellular vesicles from prebiopsy prostate cancer patients.","date":"2026","source":"Molecular oncology","url":"https://pubmed.ncbi.nlm.nih.gov/41885368","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":19228,"output_tokens":3536,"usd":0.055362,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":11197,"output_tokens":3064,"usd":0.066293,"stage2_stop_reason":"end_turn"},"total_usd":0.121655,"stage1_batch_id":"msgbatch_013a8chtv3AWyTqv4z4sEF4C","stage2_batch_id":"msgbatch_01AHsuW63vinsvuTgzmQ3n62","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2003,\n      \"finding\": \"PFDN1 (PFD1) is one of six subunits that can spontaneously assemble into a functional heterohexameric prefoldin complex in vitro. The distal tip of the PFD1-containing tentacle is required to form binary complexes with target proteins (actin and tubulins). Different but overlapping sets of subunit tips mediate binding to actin versus alpha- and beta-tubulin.\",\n      \"method\": \"In vitro reconstitution of recombinant prefoldin subunits, engineered truncation variants, binary complex formation assays with actin and tubulin substrates\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with mutagenesis/engineered variants, multiple orthogonal binding assays, rigorous mechanistic dissection of subunit contributions\",\n      \"pmids\": [\"14634002\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"In C. elegans, prefoldin subunit 1 (pfd-1) is required for efficient tubulin biogenesis. Loss of pfd-1 reduces alpha-tubulin levels and microtubule growth rate, causing embryonic cell division defects and gonadogenesis/distal tip cell migration defects. RNAi of prefoldin, CCT, or tubulin phenocopies the pfd-1 cell migration defect, placing PFDN1 upstream of tubulin folding in the prefoldin–CCT pathway.\",\n      \"method\": \"RNAi knockdown, pfd-1 null mutant analysis, immunofluorescence, microtubule dynamics measurement, genetic epistasis (phenocopy experiments)\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean null mutant + RNAi with defined cellular phenotypes, genetic epistasis to CCT and tubulin, replicated across multiple developmental contexts\",\n      \"pmids\": [\"18062952\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Pfdn1-null mice display defects in cytoskeletal function manifesting as ciliary dyskinesia, neuronal loss, and impaired B and T lymphocyte development. B cell maturation is blocked at the pre-pro-B to pre-B transition and T cell maturation at the DN to DP transition. Mature lymphocytes show impaired antigen receptor capping, a cytoskeleton-dependent process, upon BCR cross-linking.\",\n      \"method\": \"Pfdn1 knockout mouse model, flow cytometry, B/T cell developmental staging, antigen receptor capping assay\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean knockout mouse with multiple defined cellular phenotypes, mechanistically linked to cytoskeletal function\",\n      \"pmids\": [\"18566413\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Prefoldin subunits are protected from ubiquitin-proteasome system (UPS)-mediated degradation by incorporation into the hexameric complex. Knockdown of one subunit decreases protein levels of other subunits. Overexpressed (monomeric) PFD subunits are degraded by the UPS, while endogenous subunits incorporated into the complex are not. There are specific pairwise stabilization relationships among subunits.\",\n      \"method\": \"siRNA knockdown of individual subunits, proteasome inhibitor (MG132) treatment, co-transfection and co-immunoprecipitation, Western blotting\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal knockdown and pharmacological inhibition with functional readout, single lab, multiple subunit combinations tested\",\n      \"pmids\": [\"21478150\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"The prefoldin complex (requiring PFD1 as a component) suppresses polyglutamine-expanded Huntingtin (HTT) aggregation at the small oligomer (dimer-to-tetramer) stage in vitro, as demonstrated by single-molecule observation. Knockdown of PFD2 and PFD5 (which disrupts the complex including PFD1) increases soluble HTT oligomer size and induces cell death in HTT-expressing cells.\",\n      \"method\": \"Fluorescence correlation spectroscopy, single-molecule fluorescence observation in vitro, siRNA knockdown of PFD subunits, cell viability assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro single-molecule reconstitution with mechanistic resolution, but PFD1's individual contribution is inferred from complex disruption rather than direct PFD1-specific experiment\",\n      \"pmids\": [\"23720755\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Prefoldin (including PFD1 as a constituent subunit) co-localizes with polyubiquitinated proteins in cytoplasmic dots. Knockdown of prefoldin increases SDS-insoluble ubiquitinated protein levels and reduces cell viability under proteasome inhibition (lactacystin) or ER stress (thapsigargin), while overexpression has the opposite effect, establishing prefoldin as a clearance factor preventing pathological protein aggregation.\",\n      \"method\": \"Anti-prefoldin monoclonal antibody, immunofluorescence co-localization, siRNA knockdown, proteasome inhibitor and ER stress treatment, cell viability assay, SDS-PAGE/Western blotting for insoluble ubiquitinated proteins\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-localization plus loss- and gain-of-function with defined biochemical readouts, single lab\",\n      \"pmids\": [\"23946485\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"The prefoldin complex (with PFD1 as a subunit) co-localizes with aggregated alpha-synuclein in lysosomes. Knockdown of PFD2 and PFD5 (disrupting the prefoldin complex) increases alpha-synuclein aggregate accumulation and cell death, demonstrating that intact prefoldin (requiring all subunits including PFD1) protects against alpha-synuclein aggregation-induced toxicity.\",\n      \"method\": \"Fluorescence microscopy, co-localization, siRNA knockdown of prefoldin subunits, cell viability assay in Neuro-2a cells\",\n      \"journal\": \"Brain research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — PFD1's specific contribution inferred from complex disruption via other subunits, single lab, co-localization without direct mechanistic dissection of PFD1\",\n      \"pmids\": [\"24511594\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"PFDN1 subcellular distribution is altered during rabies virus (RABV) infection: PFDN1 is recruited to Negri-Body-Like (NBL) structures in the cytoplasm and co-localizes with the RABV nucleoprotein (N protein). Co-transfection of both N and P genes of RABV is required to reproduce this redistribution; transfection of N or P gene alone does not recapitulate the full redistribution.\",\n      \"method\": \"Confocal microscopy, co-localization analysis in RABV-infected and plasmid-transfected N2a cells\",\n      \"journal\": \"Jundishapur journal of microbiology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, co-localization by confocal microscopy only, no functional consequence or binding assay demonstrated\",\n      \"pmids\": [\"26421138\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"PFDN1 is upregulated during TGF-β1-induced EMT and translocates to the nucleus in lung cancer cells. Nuclear PFDN1 directly binds to the cyclin A promoter at the transcriptional start site to suppress cyclin A expression. PFDN1 overexpression induces EMT and invasion; cyclin A overexpression rescues these effects, establishing a TGF-β1/PFDN1/cyclin A axis in EMT.\",\n      \"method\": \"Overexpression and knockdown (siRNA), Western blotting, invasion assay, chromatin immunoprecipitation (ChIP) for PFDN1 at cyclin A promoter, rescue experiment with cyclin A overexpression, xenograft tumor model\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP demonstrating direct promoter binding, reciprocal gain/loss-of-function, rescue epistasis experiment, in vivo xenograft validation, multiple orthogonal methods\",\n      \"pmids\": [\"27694898\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"PFDN1 was identified as a potential binding partner of the glioma-amplified nuclear protein GAS41 by yeast two-hybrid screening.\",\n      \"method\": \"Yeast two-hybrid screening\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single yeast two-hybrid screen only, no biochemical validation of direct interaction reported in abstract\",\n      \"pmids\": [\"11521196\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"PFDN1 is a novel binding partner of FILIP1L at centrosomes throughout mitosis. FILIP1L is required for proper centrosomal localization of PFDN1 and regulates proteasome-dependent degradation of PFDN1. Increased PFDN1 caused by FILIP1L loss drives multinucleation and cytokinesis defects in vitro and in vivo.\",\n      \"method\": \"Co-immunoprecipitation, confocal microscopy (centrosome co-localization), time-lapse imaging, 3D cultures, FILIP1L knockout mouse model, xenograft\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, direct localization with functional consequence, loss-of-function in vitro and in vivo, time-lapse imaging of cytokinesis defects, multiple orthogonal methods\",\n      \"pmids\": [\"34417201\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"In lung adenocarcinoma, loss of FILIP1L leads to increased PFDN1 (its binding partner), which is associated with increased mucin secretion, proliferation, inflammation, and fibrosis, and upregulated Wnt/β-catenin signaling.\",\n      \"method\": \"Lung-specific FILIP1L knockout mice, syngeneic allograft tumors, RNA-sequencing, xenograft\",\n      \"journal\": \"Cancer research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo knockout model with pathway analysis, but PFDN1's specific mechanistic contribution is inferred from FILIP1L loss context rather than direct PFDN1 manipulation\",\n      \"pmids\": [\"36860703\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"PFDN1 silencing in triple-negative breast cancer (MDA-MB-231) cells causes G2/M cell cycle arrest, increased early apoptosis, impaired migration (wound healing), and reduced colony formation. Transcriptome profiling revealed downregulation of angiogenesis (KDR, TEK), EMT (FOXC2, SNAI1), and hypoxia (CA9, EPO) genes, and upregulation of proapoptotic FASLG.\",\n      \"method\": \"siRNA knockdown, flow cytometry (cell cycle and apoptosis), wound healing assay, colony formation assay, SEM, qRT-PCR array (84-gene cancer panel)\",\n      \"journal\": \"Naunyn-Schmiedeberg's archives of pharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function with multiple defined cellular phenotypes and transcriptome readout, single lab, no rescue or direct mechanistic target validation beyond expression changes\",\n      \"pmids\": [\"40063241\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"PFDN1 is one of six subunits of the heterohexameric prefoldin co-chaperone complex, where it contributes distal tentacle-tip contacts required for binding nascent actin and tubulin monomers for delivery to the CCT/TRiC chaperonin; beyond this canonical cytoplasmic role, PFDN1 translocates to the nucleus during TGF-β1-induced EMT to directly bind the cyclin A promoter and suppress its transcription, localizes to centrosomes where its stability is controlled by FILIP1L-mediated proteasomal degradation, and its excess at centrosomes drives cytokinesis defects and aneuploidy; prefoldin subunit stoichiometry is maintained by UPS-mediated degradation of unassembled monomers, and the intact complex suppresses pathological aggregation of polyglutamine-expanded huntingtin and alpha-synuclein.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"PFDN1 is one of six subunits of the heterohexameric prefoldin co-chaperone complex, where the distal tip of the PFDN1-containing tentacle forms binary complexes with nascent actin and tubulin for delivery into the folding pathway, with overlapping subunit-tip sets distinguishing actin from alpha- and beta-tubulin binding [#0]. Consistent with this cytoskeletal role, loss of PFDN1 reduces tubulin levels and microtubule growth and places it genetically upstream of CCT and tubulin folding [#1], and Pfdn1-null mice show cytoskeleton-dependent defects including ciliary dyskinesia, neuronal loss, and blocked B and T lymphocyte maturation with impaired antigen-receptor capping [#2]. Subunit stoichiometry is enforced by the ubiquitin-proteasome system, which degrades unassembled monomers while complex-incorporated subunits are protected, so depletion of one subunit lowers the others [#3]. The intact complex acts as a clearance factor that suppresses pathological protein aggregation, blocking polyglutamine-expanded huntingtin at the small-oligomer stage [#4] and co-localizing with polyubiquitinated aggregates to limit insoluble protein accumulation under proteasome and ER stress [#5]. Beyond chaperone function, PFDN1 is upregulated during TGF-\\u03b21-induced EMT and translocates to the nucleus, where it binds the cyclin A promoter to repress cyclin A and drive EMT and invasion in lung cancer, an effect rescued by cyclin A re-expression [#8]; at centrosomes its abundance is set by FILIP1L-dependent proteasomal degradation, and excess PFDN1 produces multinucleation and cytokinesis defects [#10].\",\n  \"teleology\": [\n    {\n      \"year\": 2003,\n      \"claim\": \"Established the molecular basis of substrate capture by defining PFDN1 as a structural subunit whose tentacle tip mediates direct binding of actin and tubulin within the assembled prefoldin complex.\",\n      \"evidence\": \"In vitro reconstitution of recombinant subunits with engineered truncations and binary complex binding assays\",\n      \"pmids\": [\"14634002\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not establish in vivo handoff kinetics to CCT/TRiC\", \"Does not define PFDN1's contribution to native complex assembly in cells\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Placed PFDN1 functionally upstream of tubulin folding in vivo, showing its loss limits tubulin biogenesis and microtubule-dependent cellular processes.\",\n      \"evidence\": \"C. elegans pfd-1 null and RNAi with microtubule dynamics measurement and genetic epistasis to CCT and tubulin\",\n      \"pmids\": [\"18062952\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not resolve whether actin folding contributes to the migration phenotype\", \"Worm phenotypes not directly mapped to mammalian tissues\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Demonstrated the organismal consequences of PFDN1 loss, linking its cytoskeletal chaperone role to ciliary, neuronal, and lymphocyte-development phenotypes.\",\n      \"evidence\": \"Pfdn1 knockout mouse with flow-cytometric developmental staging and antigen-receptor capping assay\",\n      \"pmids\": [\"18566413\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not separate cell-autonomous from systemic effects\", \"Molecular link between tubulin/actin folding and capping not directly shown\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Explained how prefoldin stoichiometry is maintained, showing unassembled subunits are degraded by the UPS while complex incorporation confers protection.\",\n      \"evidence\": \"Reciprocal siRNA knockdown, MG132 treatment, and co-IP across subunit combinations\",\n      \"pmids\": [\"21478150\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"E3 ligase mediating monomer turnover not identified\", \"Single lab; degradation signal on PFDN1 not mapped\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Extended prefoldin function beyond folding to active suppression of disease-associated aggregation, capturing huntingtin at the small-oligomer stage and limiting alpha-synuclein and ubiquitinated-protein accumulation.\",\n      \"evidence\": \"Single-molecule fluorescence in vitro, co-localization, and subunit knockdown with viability readouts\",\n      \"pmids\": [\"23720755\", \"23946485\", \"24511594\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"PFDN1-specific contribution inferred from disruption of other subunits\", \"Mechanism of oligomer recognition not defined\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Revealed a non-canonical nuclear function in which PFDN1 acts as a direct transcriptional repressor of cyclin A to drive TGF-\\u03b21-induced EMT and invasion.\",\n      \"evidence\": \"ChIP at the cyclin A promoter, reciprocal gain/loss-of-function, cyclin A rescue, and xenograft\",\n      \"pmids\": [\"27694898\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How nuclear translocation is triggered is unknown\", \"Whether PFDN1 acts alone or within a transcriptional complex at the promoter is unresolved\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Identified FILIP1L as a centrosomal partner controlling PFDN1 localization and proteasomal turnover, linking PFDN1 dosage to faithful cytokinesis.\",\n      \"evidence\": \"Reciprocal Co-IP, centrosomal co-localization, time-lapse imaging, and FILIP1L knockout mouse/xenograft\",\n      \"pmids\": [\"34417201\", \"36860703\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The E3 ligase acting on centrosomal PFDN1 is not identified\", \"Mechanistic link from excess PFDN1 to Wnt/\\u03b2-catenin activation is inferred from FILIP1L loss\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Reinforced PFDN1 as a pro-tumorigenic factor in breast cancer, with silencing causing G2/M arrest, apoptosis, and downregulation of angiogenesis/EMT/hypoxia programs.\",\n      \"evidence\": \"siRNA knockdown with cell-cycle/apoptosis flow cytometry, migration/colony assays, and a 84-gene qRT-PCR array\",\n      \"pmids\": [\"40063241\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No rescue or direct target validation beyond expression changes\", \"Whether effects are chaperone- or transcription-dependent not resolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How PFDN1 partitions between its cytoplasmic chaperone, centrosomal, and nuclear transcriptional roles, and what signals govern these switches, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural or regulatory model for PFDN1 nuclear import\", \"The trigger redistributing PFDN1 among compartments is undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0044183\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [8]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [8]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0, 5]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [8]},\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [10]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [0, 1, 3]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [8]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [10, 12]}\n    ],\n    \"complexes\": [\"prefoldin complex\"],\n    \"partners\": [\"CCT/TRiC\", \"FILIP1L\", \"GAS41\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":4,"faith_total":5,"faith_pct":80.0}}