{"gene":"WIPF2","run_date":"2026-04-28T23:00:23","timeline":{"discoveries":[{"year":2002,"finding":"WIPF2 (WICH/WIRE) associates strongly with N-WASP (and weakly with WASP) via its C-terminal WASP-interacting (W) region, and ectopic expression of WICH induces actin-microspike formation cooperatively with N-WASP; expression of the W fragment suppresses N-WASP-induced microspike formation, demonstrating an essential role for WICH in N-WASP-induced actin microspike formation.","method":"Co-immunoprecipitation, ectopic expression, dominant-negative fragment expression, actin morphology assay","journal":"Biochemical and biophysical research communications","confidence":"High","confidence_rationale":"Tier 2 — reciprocal binding assay plus functional rescue/dominant-negative with clear phenotypic readout, replicated by independent labs","pmids":["11829459"],"is_preprint":false},{"year":2002,"finding":"WIPF2 (WIRE) binds the WH1 domain of WASP and N-WASP, localizes to actin filaments, and in cells co-expressing WIRE and WASP, relocates WASP to actin filaments in a direct-interaction-dependent manner; WIRE also binds the PDGF receptor substrate Nckβ, and PDGF treatment of WIRE-expressing cells induces peripheral filopodia/lamellipodia-like protrusions and WASP translocation to the cell margin, linking WIRE to PDGF receptor signaling and actin polymerization machinery.","method":"Co-immunoprecipitation, ectopic expression, fluorescence microscopy, growth-factor stimulation assay","journal":"Experimental cell research","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (Co-IP, localization, functional PDGF stimulation) in a single study","pmids":["12213210"],"is_preprint":false},{"year":2004,"finding":"The WASP-binding domain of WIPF2 (WIRE) was mapped to a core motif at amino acid residues 408–412 plus an adjacent stretch of aromatic residues; substitutions in either motif abolished WASP binding. WIRE mutants unable to bind WASP still reorganized the actin filament system, indicating a WASP-independent actin regulatory pathway. Intact WASP-binding was required for WIRE-induced inhibition of PDGF-β receptor endocytosis, revealing two mechanistically distinct functions of WIRE.","method":"Site-directed mutagenesis, co-immunoprecipitation, receptor endocytosis assay, actin morphology assay","journal":"Experimental cell research","confidence":"High","confidence_rationale":"Tier 1–2 — mutagenesis combined with two orthogonal functional readouts in a single study","pmids":["15265696"],"is_preprint":false},{"year":2005,"finding":"WIPF2 (WICH) cross-links actin filaments in vitro, producing straight bundled filaments as visualized by fluorescence and electron microscopy; overexpression in fibroblasts causes thick actin fiber formation. Direct association with N-WASP suppresses this cross-linking activity, establishing N-WASP as a negative regulator of WICH-mediated actin bundling.","method":"In vitro co-sedimentation assay, fluorescence microscopy, electron microscopy, overexpression in cultured fibroblasts","journal":"Biochemical and biophysical research communications","confidence":"High","confidence_rationale":"Tier 1 — in vitro reconstitution of actin cross-linking plus mutagenesis-equivalent (N-WASP association suppression) and cellular validation","pmids":["15707985"],"is_preprint":false},{"year":2010,"finding":"WIPF2 (WIRE) interacts with IRSp53 via its Verprolin (V)-domain, and co-expression of WIRE and IRSp53 in N-WASP-null mouse fibroblasts induces filopodia; this is independent of N-WASP. Cdc42 regulates the WIRE–IRSp53 interaction and the plasma membrane localization of the complex, and active Cdc42(G12V) with WIRE–IRSp53 markedly increases filopodia number.","method":"Yeast two-hybrid screen, pull-down assay, co-expression in N-WASP-/- fibroblasts, fluorescence microscopy, dominant-negative/active mutants","journal":"Experimental cell research","confidence":"High","confidence_rationale":"Tier 2 — interaction mapped by pull-down plus mutagenesis, functional phenotype validated in null-cell background","pmids":["20678498"],"is_preprint":false},{"year":2016,"finding":"In human breast cancer cells, WIPF2 (WICH/WIRE) plays a non-redundant role with WIP in invadopodium biology: WIP is essential for invadopodium assembly, whereas WIPF2 regulates N-WASP activation to control invadopodium maturation and degradative activity. Nck interaction with WIPF2 and WIP modulates invadopodium maturation, and changes in their levels alter Nck distribution.","method":"RNAi knockdown, biochemical fractionation, advanced fluorescence (super-resolution) imaging, invadopodium degradation assay, co-immunoprecipitation","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (KD phenotype, Co-IP, super-resolution imaging) with clear non-redundant functional assignments","pmids":["27009365"],"is_preprint":false},{"year":2019,"finding":"WIPF2 mediates phagocytosis/internalization of Aspergillus fumigatus conidia into human bronchial airway epithelial cells; RNAi-mediated knockdown of WIPF2 significantly reduces conidial internalization, and super-resolution fluorescence microscopy shows WIPF2 is transiently localized to the site of bound conidia during internalization.","method":"RNAi knockdown, cell internalization assay, super-resolution fluorescence microscopy","journal":"Frontiers in cellular and infection microbiology","confidence":"High","confidence_rationale":"Tier 2 — KD with specific functional readout and direct localization evidence at the site of action","pmids":["30792969"],"is_preprint":false},{"year":2020,"finding":"In atherosclerosis cell lines, WIPF2 is a direct target of miR-186-5p; knockdown of WIPF2 phenocopies miR-186-5p overexpression in inhibiting cell proliferation and promoting apoptosis in ox-LDL-induced AS cells. Luciferase reporter, RNA immunoprecipitation, and RNA pull-down assays confirm WIPF2 3'UTR as a direct miR-186-5p target.","method":"Luciferase reporter assay, RNA immunoprecipitation, RNA pull-down, Western blot, flow cytometry, siRNA knockdown","journal":"Human & experimental toxicology","confidence":"Medium","confidence_rationale":"Tier 3 — miRNA-target validation with multiple assays but single lab, no direct mechanistic pathway placement beyond miRNA sponge axis","pmids":["32735135"],"is_preprint":false}],"current_model":"WIPF2 (also called WICH or WIRE) is a verprolin-family scaffold protein that binds N-WASP (and WASP) through its C-terminal W region and directly cross-links actin filaments; it cooperates with N-WASP to drive actin microspike formation, regulates invadopodium maturation and degradative activity in cancer cells through N-WASP activation, promotes filopodia independently of N-WASP via a Cdc42-regulated interaction with IRSp53, inhibits PDGF-β receptor endocytosis through its WASP-binding domain, and mediates Arp2/3-dependent phagocytosis of fungal conidia at the plasma membrane of airway epithelial cells."},"narrative":{"teleology":[{"year":2002,"claim":"Identification of WIPF2 as an N-WASP/WASP-binding protein established the gene as a new verprolin-family scaffold linking receptor signaling to actin polymerization machinery.","evidence":"Co-immunoprecipitation, dominant-negative fragment expression, and ectopic expression in mammalian cells showing cooperative microspike formation; parallel study demonstrating WIRE–Nckβ binding and PDGF-induced actin protrusions","pmids":["11829459","12213210"],"confidence":"High","gaps":["Direct actin-binding activity of WIPF2 not yet demonstrated","Minimal binding domain on WIPF2 not mapped","Physiological signaling contexts beyond PDGF not explored"]},{"year":2004,"claim":"Mutagenesis of the WASP-binding domain revealed that WIPF2 possesses a WASP-independent actin reorganization function and a separable WASP-dependent function in inhibiting PDGF-β receptor endocytosis, establishing functional modularity.","evidence":"Site-directed mutagenesis of residues 408–412 and adjacent aromatic residues combined with receptor endocytosis and actin morphology assays","pmids":["15265696"],"confidence":"High","gaps":["Mechanism by which WIPF2 inhibits receptor endocytosis is unclear","Identity of actin-regulatory partners in the WASP-independent pathway unknown"]},{"year":2005,"claim":"In vitro reconstitution demonstrated that WIPF2 directly cross-links actin filaments into straight bundles, and N-WASP association suppresses this activity, revealing a reciprocal regulatory relationship between WIPF2 and N-WASP.","evidence":"In vitro co-sedimentation, fluorescence and electron microscopy of reconstituted actin, and overexpression in fibroblasts","pmids":["15707985"],"confidence":"High","gaps":["Domains mediating actin cross-linking not mapped","Physiological contexts in which bundling versus microspike formation are selected remain undefined","No structural model for the WIPF2–actin filament interaction"]},{"year":2010,"claim":"Discovery of the WIPF2–IRSp53 interaction, regulated by Cdc42, established an N-WASP-independent pathway for filopodia formation and provided a mechanism for plasma membrane targeting of the complex.","evidence":"Yeast two-hybrid, pull-down, and co-expression in N-WASP−/− mouse fibroblasts with constitutively active Cdc42","pmids":["20678498"],"confidence":"High","gaps":["Whether the IRSp53 pathway operates in vivo or in specific tissue contexts is untested","Relationship between actin cross-linking activity and filopodia induction through IRSp53 not clarified"]},{"year":2016,"claim":"Functional separation from WIP demonstrated that WIPF2 specifically controls invadopodium maturation and ECM degradation—not assembly—through N-WASP activation, assigning non-redundant roles to verprolin-family members in cancer cell invasion.","evidence":"RNAi knockdown, super-resolution imaging, invadopodium degradation assay, and co-immunoprecipitation in breast cancer cells","pmids":["27009365"],"confidence":"High","gaps":["Mechanism by which WIPF2 selectively promotes maturation rather than assembly is unresolved","In vivo relevance for metastasis not established"]},{"year":2019,"claim":"WIPF2 was shown to mediate phagocytic internalization of fungal conidia in airway epithelial cells, extending its function to innate immune defense at mucosal surfaces.","evidence":"RNAi knockdown reducing conidial internalization and super-resolution localization of WIPF2 at sites of bound conidia in human bronchial epithelial cells","pmids":["30792969"],"confidence":"High","gaps":["Whether Arp2/3 and/or N-WASP are required downstream of WIPF2 in this context is not resolved","Role in in vivo pulmonary defense not tested"]},{"year":2020,"claim":"WIPF2 was validated as a direct miR-186-5p target in oxidized-LDL-treated cells, linking WIPF2 expression levels to proliferation and apoptosis regulation in an atherosclerosis model.","evidence":"Luciferase reporter, RNA immunoprecipitation, RNA pull-down, and siRNA knockdown phenocopying miRNA overexpression in ox-LDL-treated cell lines","pmids":["32735135"],"confidence":"Medium","gaps":["Single-lab finding not independently confirmed","Downstream mechanism connecting WIPF2 to proliferation/apoptosis regulation is not defined","Relevance to atherosclerosis in vivo is untested"]},{"year":null,"claim":"Key unresolved questions include the structural basis of WIPF2-mediated actin cross-linking, how cells switch between WIPF2's bundling, microspike, and filopodia functions, and the in vivo physiological consequences of WIPF2 loss.","evidence":"","pmids":[],"confidence":"High","gaps":["No knockout or conditional KO phenotype reported in any organism","No structural model for WIPF2 alone or in complex with actin or N-WASP","Regulation of WIPF2 by post-translational modifications largely unexplored"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[0,1,3,4]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,1,5]}],"localization":[{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[1,3]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[4,6]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[1,2,4]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[6]}],"complexes":[],"partners":["WASL","WAS","BAIAP2","NCK2","CDC42"],"other_free_text":[]},"mechanistic_narrative":"WIPF2 (also known as WICH or WIRE) is a verprolin-family actin-regulatory scaffold that coordinates actin cytoskeletal remodeling through both WASP/N-WASP-dependent and -independent mechanisms. It binds N-WASP and WASP via a C-terminal W region to cooperatively drive actin microspike formation, while its direct actin filament cross-linking activity—negatively regulated by N-WASP association—produces bundled actin fibers [PMID:11829459, PMID:15707985]. Independent of N-WASP, WIPF2 promotes filopodia formation through a Cdc42-regulated interaction with IRSp53, and it inhibits PDGF-β receptor endocytosis in a WASP-binding-dependent manner [PMID:20678498, PMID:15265696]. In cancer cells WIPF2 is non-redundant with WIP and specifically controls invadopodium maturation and matrix degradation through N-WASP activation, while in airway epithelial cells it mediates phagocytic internalization of fungal conidia [PMID:27009365, PMID:30792969]."},"prefetch_data":{"uniprot":{"accession":"Q8TF74","full_name":"WAS/WASL-interacting protein family member 2","aliases":["WASP-interacting protein-related protein","WIP- and CR16-homologous protein","WIP-related protein"],"length_aa":440,"mass_kda":46.3,"function":"Plays an active role in the formation of cell surface protrusions downstream of activated PDGFB receptors. Plays an important role in actin-microspike formation through cooperation with WASL. May cooperate with WASP and WASL to induce mobilization and reorganization of the actin filament system","subcellular_location":"Cytoplasm, cytoskeleton","url":"https://www.uniprot.org/uniprotkb/Q8TF74/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/WIPF2","classification":"Not Classified","n_dependent_lines":25,"n_total_lines":1208,"dependency_fraction":0.020695364238410598},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000171475","cell_line_id":"CID000551","localizations":[{"compartment":"cell_contact","grade":3},{"compartment":"membrane","grade":3},{"compartment":"cytoplasmic","grade":2}],"interactors":[{"gene":"WASL","stoichiometry":10.0},{"gene":"ACTG1","stoichiometry":0.2},{"gene":"FGA","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/target/CID000551","total_profiled":1310},"omim":[{"mim_id":"611282","title":"DYNAMIN-BINDING PROTEIN; DNMBP","url":"https://www.omim.org/entry/611282"},{"mim_id":"609692","title":"WAS/WASL-INTERACTING PROTEIN FAMILY, MEMBER 2; WIPF2","url":"https://www.omim.org/entry/609692"},{"mim_id":"605056","title":"WASP-LIKE ACTIN NUCLEATION-PROMOTING FACTOR; WASL","url":"https://www.omim.org/entry/605056"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/WIPF2"},"hgnc":{"alias_symbol":["WICH","WIRE"],"prev_symbol":[]},"alphafold":{"accession":"Q8TF74","domains":[],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8TF74","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q8TF74-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q8TF74-F1-predicted_aligned_error_v6.png","plddt_mean":59.66},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=WIPF2","jax_strain_url":"https://www.jax.org/strain/search?query=WIPF2"},"sequence":{"accession":"Q8TF74","fasta_url":"https://rest.uniprot.org/uniprotkb/Q8TF74.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q8TF74/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8TF74"}},"corpus_meta":[{"pmid":"9486645","id":"PMC_9486645","title":"DNA-templated assembly and electrode attachment of a conducting silver 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expression of the W fragment suppresses N-WASP-induced microspike formation, demonstrating an essential role for WICH in N-WASP-induced actin microspike formation.\",\n      \"method\": \"Co-immunoprecipitation, ectopic expression, dominant-negative fragment expression, actin morphology assay\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal binding assay plus functional rescue/dominant-negative with clear phenotypic readout, replicated by independent labs\",\n      \"pmids\": [\"11829459\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"WIPF2 (WIRE) binds the WH1 domain of WASP and N-WASP, localizes to actin filaments, and in cells co-expressing WIRE and WASP, relocates WASP to actin filaments in a direct-interaction-dependent manner; WIRE also binds the PDGF receptor substrate Nckβ, and PDGF treatment of WIRE-expressing cells induces peripheral filopodia/lamellipodia-like protrusions and WASP translocation to the cell margin, linking WIRE to PDGF receptor signaling and actin polymerization machinery.\",\n      \"method\": \"Co-immunoprecipitation, ectopic expression, fluorescence microscopy, growth-factor stimulation assay\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (Co-IP, localization, functional PDGF stimulation) in a single study\",\n      \"pmids\": [\"12213210\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"The WASP-binding domain of WIPF2 (WIRE) was mapped to a core motif at amino acid residues 408–412 plus an adjacent stretch of aromatic residues; substitutions in either motif abolished WASP binding. WIRE mutants unable to bind WASP still reorganized the actin filament system, indicating a WASP-independent actin regulatory pathway. Intact WASP-binding was required for WIRE-induced inhibition of PDGF-β receptor endocytosis, revealing two mechanistically distinct functions of WIRE.\",\n      \"method\": \"Site-directed mutagenesis, co-immunoprecipitation, receptor endocytosis assay, actin morphology assay\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — mutagenesis combined with two orthogonal functional readouts in a single study\",\n      \"pmids\": [\"15265696\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"WIPF2 (WICH) cross-links actin filaments in vitro, producing straight bundled filaments as visualized by fluorescence and electron microscopy; overexpression in fibroblasts causes thick actin fiber formation. Direct association with N-WASP suppresses this cross-linking activity, establishing N-WASP as a negative regulator of WICH-mediated actin bundling.\",\n      \"method\": \"In vitro co-sedimentation assay, fluorescence microscopy, electron microscopy, overexpression in cultured fibroblasts\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution of actin cross-linking plus mutagenesis-equivalent (N-WASP association suppression) and cellular validation\",\n      \"pmids\": [\"15707985\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"WIPF2 (WIRE) interacts with IRSp53 via its Verprolin (V)-domain, and co-expression of WIRE and IRSp53 in N-WASP-null mouse fibroblasts induces filopodia; this is independent of N-WASP. Cdc42 regulates the WIRE–IRSp53 interaction and the plasma membrane localization of the complex, and active Cdc42(G12V) with WIRE–IRSp53 markedly increases filopodia number.\",\n      \"method\": \"Yeast two-hybrid screen, pull-down assay, co-expression in N-WASP-/- fibroblasts, fluorescence microscopy, dominant-negative/active mutants\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — interaction mapped by pull-down plus mutagenesis, functional phenotype validated in null-cell background\",\n      \"pmids\": [\"20678498\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"In human breast cancer cells, WIPF2 (WICH/WIRE) plays a non-redundant role with WIP in invadopodium biology: WIP is essential for invadopodium assembly, whereas WIPF2 regulates N-WASP activation to control invadopodium maturation and degradative activity. Nck interaction with WIPF2 and WIP modulates invadopodium maturation, and changes in their levels alter Nck distribution.\",\n      \"method\": \"RNAi knockdown, biochemical fractionation, advanced fluorescence (super-resolution) imaging, invadopodium degradation assay, co-immunoprecipitation\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (KD phenotype, Co-IP, super-resolution imaging) with clear non-redundant functional assignments\",\n      \"pmids\": [\"27009365\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"WIPF2 mediates phagocytosis/internalization of Aspergillus fumigatus conidia into human bronchial airway epithelial cells; RNAi-mediated knockdown of WIPF2 significantly reduces conidial internalization, and super-resolution fluorescence microscopy shows WIPF2 is transiently localized to the site of bound conidia during internalization.\",\n      \"method\": \"RNAi knockdown, cell internalization assay, super-resolution fluorescence microscopy\",\n      \"journal\": \"Frontiers in cellular and infection microbiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — KD with specific functional readout and direct localization evidence at the site of action\",\n      \"pmids\": [\"30792969\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"In atherosclerosis cell lines, WIPF2 is a direct target of miR-186-5p; knockdown of WIPF2 phenocopies miR-186-5p overexpression in inhibiting cell proliferation and promoting apoptosis in ox-LDL-induced AS cells. Luciferase reporter, RNA immunoprecipitation, and RNA pull-down assays confirm WIPF2 3'UTR as a direct miR-186-5p target.\",\n      \"method\": \"Luciferase reporter assay, RNA immunoprecipitation, RNA pull-down, Western blot, flow cytometry, siRNA knockdown\",\n      \"journal\": \"Human & experimental toxicology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — miRNA-target validation with multiple assays but single lab, no direct mechanistic pathway placement beyond miRNA sponge axis\",\n      \"pmids\": [\"32735135\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"WIPF2 (also called WICH or WIRE) is a verprolin-family scaffold protein that binds N-WASP (and WASP) through its C-terminal W region and directly cross-links actin filaments; it cooperates with N-WASP to drive actin microspike formation, regulates invadopodium maturation and degradative activity in cancer cells through N-WASP activation, promotes filopodia independently of N-WASP via a Cdc42-regulated interaction with IRSp53, inhibits PDGF-β receptor endocytosis through its WASP-binding domain, and mediates Arp2/3-dependent phagocytosis of fungal conidia at the plasma membrane of airway epithelial cells.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"WIPF2 (also known as WICH or WIRE) is a verprolin-family actin-regulatory scaffold that coordinates actin cytoskeletal remodeling through both WASP/N-WASP-dependent and -independent mechanisms. It binds N-WASP and WASP via a C-terminal W region to cooperatively drive actin microspike formation, while its direct actin filament cross-linking activity—negatively regulated by N-WASP association—produces bundled actin fibers [PMID:11829459, PMID:15707985]. Independent of N-WASP, WIPF2 promotes filopodia formation through a Cdc42-regulated interaction with IRSp53, and it inhibits PDGF-β receptor endocytosis in a WASP-binding-dependent manner [PMID:20678498, PMID:15265696]. In cancer cells WIPF2 is non-redundant with WIP and specifically controls invadopodium maturation and matrix degradation through N-WASP activation, while in airway epithelial cells it mediates phagocytic internalization of fungal conidia [PMID:27009365, PMID:30792969].\",\n  \"teleology\": [\n    {\n      \"year\": 2002,\n      \"claim\": \"Identification of WIPF2 as an N-WASP/WASP-binding protein established the gene as a new verprolin-family scaffold linking receptor signaling to actin polymerization machinery.\",\n      \"evidence\": \"Co-immunoprecipitation, dominant-negative fragment expression, and ectopic expression in mammalian cells showing cooperative microspike formation; parallel study demonstrating WIRE–Nckβ binding and PDGF-induced actin protrusions\",\n      \"pmids\": [\"11829459\", \"12213210\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Direct actin-binding activity of WIPF2 not yet demonstrated\",\n        \"Minimal binding domain on WIPF2 not mapped\",\n        \"Physiological signaling contexts beyond PDGF not explored\"\n      ]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Mutagenesis of the WASP-binding domain revealed that WIPF2 possesses a WASP-independent actin reorganization function and a separable WASP-dependent function in inhibiting PDGF-β receptor endocytosis, establishing functional modularity.\",\n      \"evidence\": \"Site-directed mutagenesis of residues 408–412 and adjacent aromatic residues combined with receptor endocytosis and actin morphology assays\",\n      \"pmids\": [\"15265696\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Mechanism by which WIPF2 inhibits receptor endocytosis is unclear\",\n        \"Identity of actin-regulatory partners in the WASP-independent pathway unknown\"\n      ]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"In vitro reconstitution demonstrated that WIPF2 directly cross-links actin filaments into straight bundles, and N-WASP association suppresses this activity, revealing a reciprocal regulatory relationship between WIPF2 and N-WASP.\",\n      \"evidence\": \"In vitro co-sedimentation, fluorescence and electron microscopy of reconstituted actin, and overexpression in fibroblasts\",\n      \"pmids\": [\"15707985\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Domains mediating actin cross-linking not mapped\",\n        \"Physiological contexts in which bundling versus microspike formation are selected remain undefined\",\n        \"No structural model for the WIPF2–actin filament interaction\"\n      ]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Discovery of the WIPF2–IRSp53 interaction, regulated by Cdc42, established an N-WASP-independent pathway for filopodia formation and provided a mechanism for plasma membrane targeting of the complex.\",\n      \"evidence\": \"Yeast two-hybrid, pull-down, and co-expression in N-WASP−/− mouse fibroblasts with constitutively active Cdc42\",\n      \"pmids\": [\"20678498\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether the IRSp53 pathway operates in vivo or in specific tissue contexts is untested\",\n        \"Relationship between actin cross-linking activity and filopodia induction through IRSp53 not clarified\"\n      ]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Functional separation from WIP demonstrated that WIPF2 specifically controls invadopodium maturation and ECM degradation—not assembly—through N-WASP activation, assigning non-redundant roles to verprolin-family members in cancer cell invasion.\",\n      \"evidence\": \"RNAi knockdown, super-resolution imaging, invadopodium degradation assay, and co-immunoprecipitation in breast cancer cells\",\n      \"pmids\": [\"27009365\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Mechanism by which WIPF2 selectively promotes maturation rather than assembly is unresolved\",\n        \"In vivo relevance for metastasis not established\"\n      ]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"WIPF2 was shown to mediate phagocytic internalization of fungal conidia in airway epithelial cells, extending its function to innate immune defense at mucosal surfaces.\",\n      \"evidence\": \"RNAi knockdown reducing conidial internalization and super-resolution localization of WIPF2 at sites of bound conidia in human bronchial epithelial cells\",\n      \"pmids\": [\"30792969\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether Arp2/3 and/or N-WASP are required downstream of WIPF2 in this context is not resolved\",\n        \"Role in in vivo pulmonary defense not tested\"\n      ]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"WIPF2 was validated as a direct miR-186-5p target in oxidized-LDL-treated cells, linking WIPF2 expression levels to proliferation and apoptosis regulation in an atherosclerosis model.\",\n      \"evidence\": \"Luciferase reporter, RNA immunoprecipitation, RNA pull-down, and siRNA knockdown phenocopying miRNA overexpression in ox-LDL-treated cell lines\",\n      \"pmids\": [\"32735135\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Single-lab finding not independently confirmed\",\n        \"Downstream mechanism connecting WIPF2 to proliferation/apoptosis regulation is not defined\",\n        \"Relevance to atherosclerosis in vivo is untested\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the structural basis of WIPF2-mediated actin cross-linking, how cells switch between WIPF2's bundling, microspike, and filopodia functions, and the in vivo physiological consequences of WIPF2 loss.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No knockout or conditional KO phenotype reported in any organism\",\n        \"No structural model for WIPF2 alone or in complex with actin or N-WASP\",\n        \"Regulation of WIPF2 by post-translational modifications largely unexplored\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [0, 1, 3, 4]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 1, 5]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [1, 3]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [4, 6]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [1, 2, 4]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [6]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"WASL\",\n      \"WAS\",\n      \"BAIAP2\",\n      \"NCK2\",\n      \"CDC42\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}