{"gene":"WASF2","run_date":"2026-06-11T09:02:06","timeline":{"discoveries":[{"year":2004,"finding":"Abi1 directly binds the WHD domain of WAVE2, increases WAVE2 actin polymerization activity in vitro, and mediates assembly of a WAVE2-Abi1-Nap1-PIR121 complex identified by tandem mass spectrometry. This complex is as active as WAVE2-Abi1 sub-complex in stimulating Arp2/3, and re-localizes to the leading edge of ruffles following Rac activation. RNAi inhibition of Abi1 abrogates Rac-dependent lamellipodia protrusion.","method":"Tandem mass spectrometry, Co-IP, in vitro actin polymerization assay, RNAi knockdown, live-cell imaging","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — multiple orthogonal methods (MS identification, in vitro reconstitution, RNAi with defined cellular phenotype, live imaging), single rigorous study","pmids":["15048123"],"is_preprint":false},{"year":2003,"finding":"WAVE2 is specifically required for peripheral ruffle formation and directed cell migration (without ECM) downstream of PDGF stimulation in fibroblasts, whereas WAVE1 is required for dorsal ruffle formation. Loss of WAVE2 impairs leading-edge extension for directed migration.","method":"Gene-specific siRNA knockdown, live-cell migration assays, immunofluorescence","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KD with specific phenotypic readout, complemented by rescue and parallel WAVE1 comparisons","pmids":["14536061"],"is_preprint":false},{"year":2004,"finding":"WAVE2 binds PtdIns(3,4,5)P3 through its basic domain. PtdIns(3,4,5)P3 produced by PI(3)K at the cell membrane is sufficient to recruit WAVE2 to the polarized membrane even in the presence of dominant-negative Rac; a lipid-binding-deficient full-length WAVE2 mutant inhibits proper lamellipodia formation.","method":"Lipid-binding assays, myristoylated PI3K expression, dominant-negative Rac, mutant WAVE2 expression, fluorescence microscopy","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — direct lipid-binding assay combined with mutagenesis and cellular rescue/inhibition experiments","pmids":["15107862"],"is_preprint":false},{"year":2003,"finding":"Genetic disruption of WAVE2 in mice causes embryonic lethality (~E10) with haemorrhages and impaired angiogenic sprouting/branching of endothelial cells; WAVE2-null endothelial cells fail to form lamellipodia at leading edges in response to VEGF, establishing WAVE2 as essential for Rac-regulated actin reorganization during angiogenesis in vivo.","method":"Gene-targeted knockout mouse, embryological analysis, endothelial cell migration and lamellipodia assays","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — constitutive KO mouse with defined developmental and cellular phenotypes, replicated in independent KO study (PMID:12853475)","pmids":["12879075"],"is_preprint":false},{"year":2003,"finding":"WAVE2-deficient mouse embryonic fibroblasts exhibit severe defects in cell motility, lamellipodium formation, and Rac-mediated actin polymerization in response to PDGF, while proliferation is normal, establishing a non-redundant role for WAVE2 downstream of Rac in actin-based cell movement.","method":"Gene-targeted knockout mouse/MEFs, PDGF stimulation, actin polymerization and cell migration assays","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — constitutive KO with well-defined mechanistic phenotype, independent replication of WAVE2 KO","pmids":["12853475"],"is_preprint":false},{"year":2005,"finding":"Abi-1 couples WAVE2 to Abl kinase after cell stimulation, promoting Abl-mediated tyrosine phosphorylation of WAVE2 at Y150, which is required for WAVE2 activation, actin polymerization induction, and membrane translocation with activated Rac. Mutation of Y150 or disruption of WAVE2-Abi-1 binding impairs membrane actin rearrangement; Abl/Arg-null fibroblasts fail to phosphorylate WAVE2 or form membrane actin rearrangements.","method":"Co-IP, in vitro and in vivo phosphorylation assays, site-directed mutagenesis (Y150F), RNAi, fibroblast knockout cells","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — mutagenesis of phosphosite combined with Co-IP, in vitro kinase assay, and KO cell validation across two labs","pmids":["15657136"],"is_preprint":false},{"year":2006,"finding":"c-Abl interacts with the WAVE2 complex via Abi-1 and phosphorylates WAVE2 on tyrosine 150 to activate membrane ruffling; WAVE2-Y150F rescue cells fail to ruffle or form microspikes, and RNAi of WAVE2 in Abl/Arg-null cells has no additive effect on membrane ruffling, placing Abl upstream of WAVE2 in this pathway.","method":"Co-IP, in vitro kinase assay, site-directed mutagenesis (Y150F), RNAi, genetic epistasis in Abl/Arg-null cells","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — mutagenesis, epistasis, and biochemical reconstitution; independently corroborated by PMID:15657136","pmids":["16899465"],"is_preprint":false},{"year":2006,"finding":"WAVE2 complex (with Sra1/PIR121, Nap1, Abi1, HSPC300) isolated from the membrane fraction is fully active in stimulating Arp2/3 in an IRSp53-dependent manner in vitro, while cytosolic WAVE2 complex is not. Purified WAVE2 and WAVE2 complex are activated by IRSp53 in a Rac-dependent manner with PIP3-containing liposomes; IRSp53 knockdown reduces lamellipodia formation without decreasing WAVE2 complex levels.","method":"In vitro Arp2/3 activity assay, membrane fractionation, IRSp53 RNAi, purified protein reconstitution with PIP3 liposomes","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with purified components plus fractionation, single lab but multiple orthogonal methods","pmids":["16702231"],"is_preprint":false},{"year":2011,"finding":"ERK directly phosphorylates both WAVE2 and Abi1 within the WRC at lamellipodial leading edges. These phosphorylations are required for functional WRC interaction with Arp2/3 and actin during cell protrusion, as shown by phospho-deficient mutants failing to support protrusion.","method":"In vitro kinase assay, phospho-mutant analysis, co-localization by microscopy, cell protrusion assay","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — direct in vitro phosphorylation combined with phospho-mutant rescue and functional protrusion assays","pmids":["21419341"],"is_preprint":false},{"year":2006,"finding":"WAVE2 is recruited to the T cell immunological synapse following TCR crosslinking, undergoes biochemical modification, and is required for actin cytoskeletal reorganization, beta-integrin-mediated adhesion, and calcium entry at a step distal to PLCgamma1 activation and IP3-mediated store release (CRAC channel activation).","method":"Co-IP, RNAi knockdown, live-cell imaging, calcium flux assays, integrin adhesion assays","journal":"Current biology : CB","confidence":"High","confidence_rationale":"Tier 2 / Strong — combination of biochemical, genetic, and cell biology approaches defining multiple functional roles","pmids":["16401421"],"is_preprint":false},{"year":2007,"finding":"WAVE2 VCA domain mediates formation of an Arp2/3-vinculin-talin signaling complex at the T cell immunological synapse; TCR stimulation induces WAVE2-ARP2/3-dependent F-actin nucleation leading to talin recruitment and high-affinity integrin binding to VCAM-1. Vinculin is required for talin recruitment but not for F-actin or integrin accumulation.","method":"RNAi knockdown, Co-IP, immunofluorescence, integrin binding assay (VCAM-1)","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP, RNAi with defined mechanistic phenotypes, and VCA domain mapping","pmids":["17591693"],"is_preprint":false},{"year":2008,"finding":"The WAVE2 complex associates with Abl tyrosine kinase in T cells; TCR ligation induces WAVE2-dependent membrane recruitment of Abl. WAVE2 regulates TCR-mediated Rap1 activation via recruitment of CrkL-C3G exchange complex; Abl phosphorylates C3G to enable its GEF activity toward Rap1, controlling integrin clustering and affinity maturation.","method":"Co-IP, RNAi, dominant-negative constructs, Rap1 activation assay, integrin clustering assay","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP, RNAi with specific signaling pathway phenotype, mechanistic pathway dissection","pmids":["18809728"],"is_preprint":false},{"year":2008,"finding":"Cdk5 phosphorylates WAVE2 at Ser-137 in vitro, downstream of Fyn kinase activation by PDGF, to control oligodendrocyte precursor cell migration. WAVE2-S137A mutant impairs PDGF-dependent OPC migration.","method":"In vitro kinase assay, site-directed mutagenesis (S137A), retroviral shRNA knockdown, cell migration assay","journal":"The Journal of neuroscience : the official journal of the Society for Neuroscience","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — in vitro phosphorylation assay with mutagenesis and functional cell migration readout","pmids":["18701695"],"is_preprint":false},{"year":2018,"finding":"LRRK2 binds WAVE2 and phosphorylates it at Thr470, stabilizing WAVE2 and preventing its proteasomal degradation. LRRK2-G2019S (gain-of-function PD mutation) causes increased WAVE2-mediated phagocytic responses in macrophages/microglia; Lrrk2 loss causes the opposite. WAVE2 mediates LRRK2-G2019S-induced dopaminergic neuronal death.","method":"Co-IP, in vitro kinase assay, proteasome inhibitor treatment, siRNA knockdown, macrophage/microglia phagocytosis assay, in vivo mouse model","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — in vitro kinase assay identifying phosphosite, Co-IP, KO/KI mouse models, and in vivo rescue","pmids":["29760073"],"is_preprint":false},{"year":2021,"finding":"Conditional T cell-specific ablation of WAVE2 causes severe autoimmunity with increased mTOR activation. WAVE2 directly bound mTOR and inhibited its activation by impeding mTOR interactions with RAPTOR and RICTOR. Both T cell defects and autoimmunity were ameliorated by pharmacological mTOR inhibitors.","method":"Conditional KO mouse, Co-IP (WAVE2-mTOR direct binding), mTOR inhibitor rescue, phosphoproteomic/metabolic analysis","journal":"Science (New York, N.Y.)","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO with in vivo phenotype, direct Co-IP demonstrating WAVE2-mTOR interaction, pharmacological rescue","pmids":["33766857"],"is_preprint":false},{"year":2010,"finding":"Dysbindin-1 forms a ternary complex with WAVE2 and Abi-1 in neurons (but not N-WASP); dysbindin-1 promotes binding of WAVE2 to Abi-1. RNAi knockdown of dysbindin-1 generates abnormally elongated immature dendritic protrusions, implicating the complex in dendritic spine morphogenesis.","method":"Co-IP, immunofluorescence, RNAi knockdown in hippocampal neurons","journal":"Molecular psychiatry","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — Co-IP identifying ternary complex, RNAi with morphological phenotype; single lab","pmids":["20531346"],"is_preprint":false},{"year":2007,"finding":"ERK2 directly phosphorylates WAVE2 in vitro at sites in the proline-rich region and VCA domain. Phosphorylation of the VCA region increases its affinity for Arp2/3 but paradoxically reduces Arp2/3-mediated actin polymerization activity in vitro.","method":"In vitro kinase assay with ERK2, actin polymerization assay, binding assay","journal":"Journal of biochemistry","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — direct in vitro kinase/polymerization assay but single lab, no in vivo validation of functional consequence","pmids":["17202194"],"is_preprint":false},{"year":2007,"finding":"MAP kinase phosphorylation sites within WAVE2 regulate persistent cell migration and Golgi polarization; fibroblasts expressing phospho-defective WAVE2 show increased migration speed, decreased persistence, and disrupted Golgi polarization—effects mimicked by acute WAVE2 RNAi knockdown.","method":"Site-directed mutagenesis of MAP kinase phosphosites, transgene expression, scratch-wound migration assay, RNAi","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mutagenesis with functional migration readout confirmed by RNAi phenocopy, single lab","pmids":["18032787"],"is_preprint":false},{"year":2009,"finding":"Casein kinase 2 (CK2) phosphorylates five serine residues (482, 484, 488, 489, 497) in the WAVE2 VCA domain; phosphorylation is required for high-affinity Arp2/3 interaction, while phosphorylation of Ser482/484 specifically inhibits Arp2/3 activation. Non-phosphorylatable alanine mutations inhibit WAVE2-dependent cell ruffling and leading-edge integrity in vivo.","method":"In vitro CK2 phosphorylation, mutagenesis, Arp2/3 binding/activation assay, cell ruffling assay","journal":"Cell motility and the cytoskeleton","confidence":"Medium","confidence_rationale":"Tier 1–2 / Weak — in vitro kinase assay with mutagenesis and cellular readout, single lab","pmids":["19012317"],"is_preprint":false},{"year":2011,"finding":"Abi1 knockout cells display reduced WAVE1 and WAVE2 protein levels along with Nap1 and Sra-1/PIR121, demonstrating that Abi1 is required for the stability and integrity of the entire WAVE complex. Abi1 KO causes decreased migration rate and distance but increased directional persistence, without affecting peripheral ruffling but impairing dorsal ruffling.","method":"Conditional Abi1 KO mouse/MEFs, Western blot of complex components, migration assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Moderate — conditional KO with defined complex stability and migration phenotypes, multiple readouts","pmids":["21482783"],"is_preprint":false},{"year":2001,"finding":"The basic region of WAVE2 (between WH1 and CRIB domains) binds ADP actin filaments, enhancing Arp2/3 branching efficiency on pre-existing ADP filaments by ~2-fold compared to VCA domain alone. This basic region is required for actin-based bead motility in cytosol; VCA domain alone or constructs lacking the basic region fail to support bead movement.","method":"In vitro actin polymerization/branching assay, bead motility assay in brain cytosol, deletion constructs","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with purified components and deletion mutagenesis; functionally validated with bead motility","pmids":["11792818"],"is_preprint":false},{"year":2001,"finding":"The basic region of WAVE2 is required for actin-based motility in cell extracts; beads coated with full-length WAVE2 but not WAVE2 lacking the basic clusters (Delta basic) or VCA alone support movement in brain cytosol, and VCA/Delta-basic constructs are much less able to induce actin polymerization in cytosol.","method":"Polystyrene bead motility assay in brain cytosol, in vitro actin polymerization assay, deletion constructs","journal":"Biochemical and biophysical research communications","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution (bead motility, actin polymerization), deletion mutagenesis; corroborates PMID:11792818","pmids":["11401525"],"is_preprint":false},{"year":2005,"finding":"WAVE2 is required for Rac1-induced membrane ruffling, invasion into ECM, and pulmonary metastasis of B16F10 melanoma cells. WAVE2 acts as the primary downstream effector of Rac to achieve invasion; co-expression of RacCA and WAVE2 in parental B16 cells additively increases invasiveness beyond RacCA alone.","method":"RNAi knockdown, constitutively active Rac co-expression, Matrigel invasion assay, in vivo metastasis assay","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 2 / Strong — RNAi KD with in vitro and in vivo metastasis phenotypes, genetic epistasis via RacCA co-expression","pmids":["15608687"],"is_preprint":false},{"year":2010,"finding":"WAVE2 directly binds Abl kinase and activates HIV-1 Arp2/3-dependent actin polymerization; Tiam-1 (Rac GEF) associates with IRSp53 to link Rac to the WAVE2 complex. Rac and Abl activate the WAVE2 complex for pore expansion at the hemifusion stage of HIV-1 entry; siRNA knockdown of WAVE2, Abl, IRSp53, or Arp3 attenuates HIV-1 fusion and infection.","method":"siRNA knockdown, fusion assay, virus-cell infection assay, Abl kinase inhibitors (imatinib, nilotinib, dasatinib), fluorescence microscopy with membrane curving agents","journal":"PLoS pathogens","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple siRNA targets and pharmacological inhibition with functional readouts; pathway dissection by epistasis","pmids":["20585556"],"is_preprint":false},{"year":2014,"finding":"HIV-1 gp120 binding to CXCR4 or CCR5 triggers WAVE2 phosphorylation at serine 351 via both Gαi-dependent and -independent pathways; WAVE2-mediated Arp2/3 activity is required for HIV-1 nuclear migration. Stable shRNA knockdown of Arp3 or Arp2/3 inhibitor CK548 prevented HIV-1 nuclear migration and infection of CD4 T cells.","method":"Phosphorylation mapping, shRNA knockdown, Arp2/3 inhibitor, HIV-1 infection/nuclear migration assay in primary cells","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — site-specific phosphorylation identified, shRNA and pharmacological inhibition with nuclear migration readout; single lab","pmids":["24415754"],"is_preprint":false},{"year":2011,"finding":"IL-2 activates WAVE2 in NK cells to enable WASp-independent F-actin accumulation at the immunological synapse and NK cell cytotoxicity. WAVE2 was required for IL-2-induced WASp-independent NK function but not for baseline innate NK activity, defining WAVE2 and WASp as parallel pathways to F-actin reorganization.","method":"WASp inhibitor, WAS patient cells, siRNA knockdown of WAVE2, NK cytotoxicity assay, F-actin quantification at IS","journal":"The Journal of clinical investigation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — patient cells combined with WASp inhibitor and siRNA, defined functional phenotype; single lab","pmids":["21383498"],"is_preprint":false},{"year":2011,"finding":"WAVE2 regulates meiotic spindle stability, peripheral positioning, and polar body emission in mouse oocytes via an actin-mediated pathway. siRNA-mediated and antibody-mediated disruption of WAVE2 causes failure of chromosome congression, spindle formation, spindle positioning, polar body extrusion, actin cap and cortical granule-free domain formation. WAVE2 regulation of chromosome migration is independent of microtubules.","method":"siRNA knockdown, antibody microinjection, immunofluorescence, nocodazole treatment (microtubule depletion)","journal":"Cell cycle (Georgetown, Tex.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — two independent disruption methods (siRNA + antibody) with specific meiotic phenotypes; single lab","pmids":["21543895"],"is_preprint":false},{"year":2009,"finding":"Pak1 constitutively binds WAVE2 and is transported with WAVE2 to the leading edge upon HGF stimulation. Pak1 mediates kinesin-dependent WAVE2 transport along microtubules by phosphorylating stathmin/Op18 at Ser38 and recruiting phospho-stathmin to the kinesin-WAVE2 complex. Pak1 inhibition or depletion abrogates HGF-induced WAVE2 transport and lamellipodia formation.","method":"Co-IP, siRNA knockdown of Pak1, Pak1 inhibitor (IPA-3), phospho-specific antibodies, lamellipodia assay","journal":"Cellular signalling","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — Co-IP plus pharmacological and siRNA inhibition with cellular phenotype; single lab","pmids":["19162178"],"is_preprint":false},{"year":2008,"finding":"Kinesin heavy chain KIF5B forms a complex with WAVE2 and IQGAP1; HGF-induced WAVE2 transport to the cell periphery and lamellipodia formation require KIF5B-mediated transport along microtubules in a Rac1-dependent manner. Downregulation of KIF5B or microtubule depolymerization abrogates WAVE2 transport.","method":"Co-IP (WAVE2-KIF5B), siRNA knockdown of KIF5B, nocodazole treatment, lamellipodia quantification","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — Co-IP combined with siRNA and pharmacological inhibition with cellular phenotype; single lab","pmids":["18514191"],"is_preprint":false},{"year":2010,"finding":"PKA forms a complex with WAVE2 in breast cancer cells and brain extracts; two separate regions of WAVE2 mediate PKA binding. WAVE2 serves as an A-kinase-anchoring protein (AKAP) that recruits PKA to membrane protrusions; WAVE2 depletion impairs PKA localization at protrusions and PKA activation-induced enlargement of membrane protrusions.","method":"Co-IP, siRNA knockdown, PKA activator treatment, immunofluorescence of protrusion size","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — Co-IP with domain mapping, siRNA with functional readout; single lab","pmids":["21119216"],"is_preprint":false},{"year":2007,"finding":"WAVE2 complex is required for Rac-Abi-1-dependent actin recruitment and entry of Chlamydia trachomatis into epithelial cells; siRNA depletion of WAVE2 and Abi-1 abrogates chlamydia-induced actin recruitment and significantly reduces pathogen uptake. C. trachomatis infection promotes Rac interaction with WAVE2 and Abi-1 but not with IRSp53.","method":"Co-IP, siRNA knockdown, bacterial invasion/infection assay, immunofluorescence","journal":"Cellular microbiology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — Co-IP plus siRNA with specific infection phenotype; single lab","pmids":["17501982"],"is_preprint":false},{"year":2005,"finding":"WAVE2-Abi1 complex is required for CSF-1-induced F-actin protrusions and macrophage migration. WAVE2 and Abi1 are co-recruited to protrusions; reducing WAVE2 by dominant-negative, antibody, or RNAi impairs CSF-1-elicited actin protrusions, and targeting Abi1 reduces WAVE2 levels and impairs migration.","method":"Dominant-negative expression, antibody microinjection, RNAi, Co-IP, cell migration assay","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — three independent disruption methods with consistent phenotype; single lab","pmids":["16280551"],"is_preprint":false},{"year":2008,"finding":"Membrane targeting of WAVE2 alone is insufficient for WAVE2-dependent actin polymerization; IRSp53 links Rac1 to WAVE2-Abi1 in a Rac1-activation-dependent immunoprecipitable complex in macrophages. Reduction of IRSp53 or expression of IRSp53 lacking the WAVE2-binding SH3 domain significantly reduces Rac1 association with WAVE2 and Abi1, and diminishes CSF-1-induced protrusions and migration.","method":"RNAi, Co-IP, dominant-negative IRSp53, membrane-targeted WAVE2 expression, migration/protrusion assays","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — RNAi combined with Co-IP and dominant-negative approaches; mechanistically informative negative finding on membrane targeting","pmids":["18198193"],"is_preprint":false},{"year":2014,"finding":"Cortactin directly binds both WAVE2 and Arp2/3 at the epithelial zonula adherens; both interactions are necessary for actin assembly at the ZA. Cortactin binding to the cadherin cytoplasmic tail was demonstrated by cell-free protein expression and fluorescent single-molecule coincidence assays.","method":"Cell-free protein expression, fluorescent single-molecule coincidence assay, siRNA knockdown, in vitro binding assays","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 1–2 / Weak — direct binding demonstrated by novel in vitro approach; single lab, limited replication","pmids":["24469447"],"is_preprint":false},{"year":2011,"finding":"WAVE2 and mDia1 interact directly with IRSp53 within filopodia, as shown by acceptor photobleaching FRET. mDia1 and WAVE2 synergize with IRSp53 to form filopodia; depletion of either mDia1 or WAVE2 decreases IRSp53-induced filopodia formation.","method":"Acceptor photobleaching FRET, siRNA knockdown, time-lapse imaging of filopodium formation","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct FRET evidence for in-cell protein interaction combined with functional depletion assay; single lab","pmids":["22179776"],"is_preprint":false},{"year":2012,"finding":"WAVE2-Abi2 complex activity is regulated by Abl kinase (via Y150 phosphorylation) and Cdk5 (via S137 phosphorylation) to control growth cone activity and the multipolar-to-bipolar neuronal transition, as well as initiation of glia-guided migration in the developing neocortex.","method":"In utero electroporation, mutagenesis (Y150, S137), time-lapse imaging of migrating neurons","journal":"Cerebral cortex (New York, N.Y. : 1991)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo mutagenesis at known phosphosites with defined developmental phenotype; single lab","pmids":["22617848"],"is_preprint":false},{"year":2005,"finding":"WAVE2 is required for efficient invasion of polarized epithelial cells by Salmonella typhimurium. Disruption of the PIR121/Nap1/Abi1/WAVE2/HSPC300 pentameric complex potently inhibits bacterial uptake, while the IRSp53/WAVE2 complex is not required for invasion despite being formed during infection.","method":"siRNA knockdown, dominant-negative complex disruption, bacterial invasion/internalization assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — siRNA and dominant-negative with specific bacterial invasion phenotype; dissection of which complex is relevant","pmids":["15929989"],"is_preprint":false},{"year":2004,"finding":"N-WASP and WAVE2 act downstream of phosphatidylinositol 3-kinase to mediate HGF-induced lamellipodia formation and myogenic cell migration; dominant-negative WAVE2 or WAVE2 RNAi prevents HGF-induced lamellipodial formation and both non-directional and directional migration of C2C12 myoblasts.","method":"Dominant-negative expression, RNAi knockdown, PI3K inhibitor (LY294002), cell migration and chemotaxis assays","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — dominant-negative plus RNAi with functional phenotypes, pathway placed downstream of PI3K; single lab","pmids":["15496413"],"is_preprint":false},{"year":2010,"finding":"Nonmuscle myosin IIA (MYH9) constitutively associates with WAVE2 in a myosin II activity-dependent manner; the MYH9-WAVE2 complex co-localizes to PIP3 at the leading edge after IGF-I stimulation. Depletion of MYH9 or inhibition of myosin II by blebbistatin abrogates F-actin arc and lamellipodia formation, indicating MYH9 is required for lamellipodia through binding to WAVE2.","method":"Co-IP (identified by mass spectrometry), siRNA knockdown, blebbistatin treatment, immunofluorescence","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — Co-IP with MS identification, pharmacological and siRNA inhibition with cellular phenotype; single lab","pmids":["21184743"],"is_preprint":false},{"year":2015,"finding":"Cortactin phosphorylation on S405/S418 by PLCβ3-PKCδ downstream of MCP1/CCR2/Gαq11 signaling is required for cortactin interaction with WAVE2; this interaction mediates G-actin polymerization, F-actin stress fiber formation, and smooth muscle cell migration.","method":"Co-IP, siRNA knockdown of PLCβ3/PKCδ/CCR2/Gαq11, phosphomimetic/phosphodeficient mutants, actin polymerization and migration assays","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — Co-IP showing phosphorylation-dependent interaction, siRNA epistasis with functional readout; single lab","pmids":["26490115"],"is_preprint":false},{"year":2012,"finding":"SKAP2 physically associates with both WAVE2 and cortactin and inhibits their interaction; cortactin is required for membrane localization of WAVE2, and SKAP2 suppresses WAVE2/cortactin-mediated actin polymerization in vitro. SKAP2 knockdown enhances WAVE2 translocation to cell membrane and accelerates cell migration in a SKAP2-WAVE2 binding-dependent manner.","method":"Co-IP, in vitro actin polymerization assay, siRNA knockdown, cell migration assay, binding-deficient mutant","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — in vitro reconstitution of SKAP2 suppression, Co-IP, siRNA with functional readout; single lab","pmids":["23161539"],"is_preprint":false},{"year":2017,"finding":"Following T cell activation, WAVE2 undergoes ubiquitylation at lysine 45 (mapped by mutagenesis), leading to proteasomal degradation. The autoinhibitory conformation of the WRC stabilizes WAVE2 in resting cells (shown by FRET); release of autoinhibition upon activation exposes K45 to ubiquitylation and degradation.","method":"FRET (to detect WRC conformational state), ubiquitylation assays, mutagenesis (K45), proteasome inhibitor treatment, T cell activation","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — FRET conformational assay combined with mutagenesis and biochemical ubiquitylation mapping; single lab","pmids":["28332566"],"is_preprint":false},{"year":2014,"finding":"WAVE2 recruitment to the TCR signaling site requires ZAP-70, LAT, SLP-76, and Nck (similar to WASp). However, unlike WASp, WAVE2 leaves this complex and migrates peripherally with vinculin to the membrane leading edge. These dynamics were demonstrated using FRET and triple-color FRET technology in live T cells.","method":"FRET, triple-color FRET (3FRET), siRNA knockdown, live T cell imaging","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — FRET-based live-cell demonstration of complex dynamics and pathway position; single lab","pmids":["25342748"],"is_preprint":false},{"year":2018,"finding":"Hem-1 (Nap1) scaffold loss leads to degradation of the entire WAVE2 complex and loss of c-Abl survival signaling from the complex, causing failure of fetal liver HSC engraftment in bone marrow. This engraftment defect is not due to defects in actin-dependent chemotaxis, homing, or adhesion, but to loss of Abl signaling.","method":"Hem-1 KO mouse, HSC transplantation, homing/migration/adhesion assays, Western blot of complex components, Abl signaling analysis","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO mouse with genetic dissection separating actin function from Abl signaling function of the complex; single lab","pmids":["29915352"],"is_preprint":false},{"year":2006,"finding":"Vinexin beta interacts with the proline-rich region of WAVE2 through its first and second SH3 domains and increases WAVE2 protein levels by reducing proteasomal degradation in a PKA-dependent manner. PKA activation alone increases WAVE2 expression; PKA inhibition suppresses vinexin-induced WAVE2 increase.","method":"Co-IP, domain mapping by mutagenesis, proteasome inhibitor treatment, PKA activation/inhibition, Western blot","journal":"Genes to cells : devoted to molecular & cellular mechanisms","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — Co-IP with domain mapping and pharmacological modulation; single lab","pmids":["16483316"],"is_preprint":false},{"year":2015,"finding":"NESH/Abi-3 forms a WAVE2 complex that is functionally distinct from the Abi-1-based WAVE2 complex: NESH/Abi-3 neither binds c-Abl nor promotes c-Abl-mediated WAVE2 phosphorylation, and expression of NESH/Abi-3 reduces WAVE2 translocation to the plasma membrane and disrupts lamellipodial protrusion. A linker region between proline-rich regions and the SH3 domain of Abi-1 is required for its c-Abl interaction and c-Abl-mediated WAVE2 phosphorylation.","method":"Co-IP, domain mapping, imatinib inhibition, siRNA, fluorescence microscopy of WAVE2 localization","journal":"Cell communication and signaling : CCS","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — Co-IP with domain mutagenesis, pharmacological and genetic dissection; single lab","pmids":["26428302"],"is_preprint":false},{"year":2016,"finding":"TrkC activation by neurotrophin-3 leads to ERK-dependent phosphorylation of WAVE2 at Thr346 and Ser351, causing a WAVE2 mobility shift; mutagenesis of these sites or ERK inhibition abolishes TrkC-induced WAVE2 shift and podocyte migration. WAVE2 shRNA knockdown abolishes TrkC-induced podocyte migration.","method":"Mutagenesis of ERK phosphosites (T346/S351), ERK inhibition, shRNA knockdown, podocyte migration assay","journal":"FASEB journal : official publication of the Federation of American Societies for Experimental Biology","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — mutagenesis of phosphosites with functional migration readout and shRNA confirmation; single lab","pmids":["29162704"],"is_preprint":false},{"year":2013,"finding":"WAVE2 knockdown in 3D epithelial acini causes cadherin isoform switching (decreased E-cadherin, increased N-cadherin) and upregulation of Twist1 mRNA; knockdown of Twist1 in WAVE2-KD cells reverses cadherin switching and rescues the aberrant morphological phenotype. Abl kinase activity is increased in WAVE2-KD cells, and Abl inhibition rescues the multi-lobular phenotype, placing WAVE2 upstream as a repressor of Abl/Twist1 activity.","method":"shRNA knockdown, 3D acini culture, Abl inhibitor (STI571), Twist1 knockdown rescue, qRT-PCR, immunostaining","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — siRNA with pathway rescue by Twist1 KD and Abl inhibition, epistasis; single lab","pmids":["23691243"],"is_preprint":false},{"year":2020,"finding":"WAVE1 and WAVE2 are redundant for lamellipodia formation and motility in B16-F1 melanoma cells; however, WAVE2 KO decreases the rate of leading-edge actin extension while WAVE1 KO increases it. WAVE1 restricts the rate of actin extension and couples actin networks to the membrane to drive protrusion.","method":"CRISPR knockout of WAVE1 and WAVE2 individually and together, leading-edge actin extension measurement, retrograde flow measurement","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 / Moderate — CRISPR KO of both isoforms separately and in combination with quantitative actin dynamics measurements; single lab","pmids":["32697617"],"is_preprint":false},{"year":2009,"finding":"HSPC300 interacts with WAVE2 protein and its silencing results in WAVE2 degradation in vitro, indicating HSPC300 is required for WAVE2 stability within the complex.","method":"siRNA knockdown, Western blot of WAVE2 levels, Co-immunoprecipitation","journal":"Lung cancer (Amsterdam, Netherlands)","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single pulldown/siRNA observation in cancer cell lines; single lab","pmids":["19576655"],"is_preprint":false}],"current_model":"WAVE2 (WASF2) is a core component of the pentameric WAVE regulatory complex (WRC; with Abi1/Abi2, Nap1, Sra-1/PIR121, and HSPC300) that relays upstream signals from Rac GTPase and PtdIns(3,4,5)P3 to the Arp2/3 complex, driving branched actin nucleation for lamellipodia, membrane ruffles, and directed cell migration; its activity is controlled by multiple phosphorylation events (Abl at Y150, Cdk5 at S137, ERK at T346/S351 and other sites, CK2 at VCA serines), ubiquitylation at K45 coupled to WRC conformational changes, and scaffolding interactions with IRSp53, cortactin, kinesin/IQGAP1, MYH9, PKA, and mTOR, with Abi1 being essential for both complex integrity and Abl-mediated WAVE2 activation, and WAVE2 itself also functioning as a direct inhibitor of mTOR to maintain T cell homeostasis."},"narrative":{"mechanistic_narrative":"WASF2 (WAVE2) is a nucleation-promoting factor that converts upstream Rac and phosphoinositide signals into branched actin polymerization at the cell periphery, driving lamellipodia, membrane ruffles, and directed migration [PMID:14536061, PMID:12853475]. It functions as the core catalytic subunit of a pentameric complex with Abi1, Nap1, PIR121/Sra-1, and HSPC300, which is fully competent to stimulate the Arp2/3 complex and relocalizes to the leading edge upon Rac activation [PMID:15048123]. Membrane recruitment and activation are governed by the WAVE2 basic region binding PtdIns(3,4,5)P3 produced by PI3K [PMID:15107862], by IRSp53 linking active Rac to the membrane-associated complex [PMID:16702231, PMID:18198193], and by the basic region engaging ADP-actin filaments to enhance Arp2/3 branching [PMID:11792818, PMID:11401525]. Genetic ablation confirms a non-redundant requirement for WAVE2 in Rac/PDGF-driven lamellipodium formation and motility, and in VEGF-dependent endothelial sprouting during angiogenesis, where loss causes embryonic lethality with hemorrhage [PMID:12879075, PMID:12853475]. WAVE2 activity is tuned by a network of phosphorylation events: Abi1-dependent recruitment of Abl kinase phosphorylates Tyr150 to activate the complex [PMID:15657136, PMID:16899465], Cdk5 phosphorylates Ser137 [PMID:18701695], and ERK phosphorylates the proline-rich and VCA regions (including Thr346/Ser351) to control protrusion, persistence, and Golgi polarization [PMID:21419341, PMID:18032787, PMID:29162704]; CK2 phosphorylation of VCA serines modulates Arp2/3 binding and activation [PMID:19012317]. Complex integrity itself is a control point, as Abi1, Nap1/Hem-1, and HSPC300 are each required for WAVE2 stability, and release of WRC autoinhibition upon activation exposes Lys45 to ubiquitylation and proteasomal degradation [PMID:21482783, PMID:29915352, PMID:28332566]. Beyond actin nucleation, WAVE2 serves broader roles in immune cells: at the T cell immunological synapse it couples Arp2/3-driven F-actin to vinculin/talin recruitment and integrin affinity maturation via an Abl–CrkL–C3G–Rap1 axis [PMID:17591693, PMID:18809728], and it directly binds and inhibits mTOR—impeding RAPTOR and RICTOR association—to restrain mTOR signaling and prevent autoimmunity [PMID:33766857]. WAVE2 is also exploited by pathogens for actin-dependent invasion and by tumor cells for Rac-driven invasion and metastasis [PMID:15608687, PMID:15929989].","teleology":[{"year":2001,"claim":"Established that beyond the canonical VCA module, the WAVE2 basic region directly engages actin filaments and is itself essential for actin-based motility, refining how the protein nucleates branched networks.","evidence":"In vitro actin branching and bead-motility assays in brain cytosol with deletion constructs","pmids":["11792818","11401525"],"confidence":"High","gaps":["Did not place the basic region in the context of the assembled pentameric complex","Structural basis of ADP-filament recognition not resolved"]},{"year":2003,"claim":"Defined non-redundant, isoform-specific roles by showing WAVE2 is required for peripheral ruffling and directed migration downstream of Rac/PDGF in vivo, distinct from WAVE1.","evidence":"Gene-specific siRNA and knockout mice/MEFs with migration and lamellipodia readouts; angiogenesis phenotype","pmids":["14536061","12853475","12879075"],"confidence":"High","gaps":["Molecular composition of the active complex not yet defined","Mechanism of Rac-to-WAVE2 coupling unresolved at this stage"]},{"year":2004,"claim":"Resolved the activation input architecture by identifying the WAVE2–Abi1–Nap1–PIR121 complex and showing PtdIns(3,4,5)P3 recruits WAVE2 to the membrane via its basic domain.","evidence":"Tandem MS, Co-IP, in vitro Arp2/3 assays, lipid-binding assays, mutant rescue, RNAi","pmids":["15048123","15107862"],"confidence":"High","gaps":["How lipid binding and Rac signaling are integrated kinetically not defined","HSPC300 not yet placed in the complex here"]},{"year":2005,"claim":"Identified the first activating phosphorylation, establishing Abi1-dependent Abl phosphorylation of WAVE2 Tyr150 as required for activation and membrane translocation.","evidence":"Co-IP, in vitro/in vivo kinase assays, Y150F mutagenesis, Abl/Arg-null fibroblasts","pmids":["15657136","16899465"],"confidence":"High","gaps":["How Tyr150 phosphorylation alters WRC conformation not defined","Stimulus specificity of Abl recruitment unresolved"]},{"year":2006,"claim":"Spatially resolved activation by showing only the membrane-associated WAVE2 complex is Arp2/3-active, and is switched on by IRSp53 in a Rac/PIP3-dependent manner.","evidence":"Membrane fractionation, purified-protein reconstitution with PIP3 liposomes, IRSp53 RNAi","pmids":["16702231"],"confidence":"High","gaps":["Why cytosolic complex is inactive at the molecular level not fully defined","IRSp53 stoichiometry within the complex unresolved"]},{"year":2006,"claim":"Extended WAVE2 function to immune cells, defining its requirement at the T cell synapse for actin reorganization, integrin adhesion, and calcium entry distal to PLCγ1.","evidence":"Co-IP, RNAi, live imaging, calcium flux and integrin adhesion assays","pmids":["16401421"],"confidence":"High","gaps":["Link between actin and CRAC channel activation mechanistically unclear","Identity of the WAVE2 biochemical modification not defined here"]},{"year":2008,"claim":"Dissected synapse signaling output, showing WAVE2 recruits Abl and the CrkL–C3G complex to activate Rap1 and control integrin affinity maturation, and identified Cdk5/Ser137 as a migration-controlling input in neural cells.","evidence":"Co-IP, RNAi, dominant-negatives, Rap1 activation assays; in vitro kinase assay and S137A mutagenesis","pmids":["18809728","18701695"],"confidence":"High","gaps":["How distinct phosphosites are coordinated not defined","Whether Rap1 axis operates outside T cells unknown"]},{"year":2011,"claim":"Established complex stability as a regulatory node and identified ERK as a direct WRC kinase required for productive Arp2/3 engagement during protrusion.","evidence":"Abi1 conditional KO with complex Western blots; in vitro ERK kinase assay with phospho-mutant rescue and protrusion assays","pmids":["21482783","21419341"],"confidence":"High","gaps":["Identity of the WAVE2 ubiquitin ligase not addressed","How ERK phosphorylation integrates with Abl/CK2 inputs unclear"]},{"year":2017,"claim":"Connected conformation to turnover, showing WRC autoinhibition stabilizes WAVE2 while activation exposes Lys45 for ubiquitylation and degradation.","evidence":"FRET conformational sensing, K45 mutagenesis, ubiquitylation and proteasome-inhibitor assays in T cells","pmids":["28332566"],"confidence":"Medium","gaps":["Responsible E3 ligase not identified","Single-lab finding awaiting independent confirmation"]},{"year":2018,"claim":"Revealed actin-independent functions of the complex—WAVE2 stabilization by LRRK2 phosphorylation in disease and Hem-1-dependent Abl survival signaling separable from actin dynamics.","evidence":"In vitro kinase assays, Co-IP, proteasome inhibition, KO mouse models and HSC transplantation","pmids":["29760073","29915352"],"confidence":"Medium","gaps":["Whether LRRK2 and Abl phosphosites cooperate unknown","Mechanism linking complex to survival signaling not fully defined"]},{"year":2021,"claim":"Demonstrated a non-actin role: WAVE2 directly binds and inhibits mTOR by blocking RAPTOR/RICTOR association, maintaining T cell homeostasis and preventing autoimmunity.","evidence":"T cell-specific conditional KO, Co-IP, mTOR-inhibitor rescue, phosphoproteomics","pmids":["33766857"],"confidence":"High","gaps":["Structural basis of WAVE2–mTOR binding undefined","Whether mTOR inhibition occurs outside T cells unknown"]},{"year":null,"claim":"How the many phosphorylation, ubiquitylation, and scaffolding inputs are integrated in time and space to switch a single WAVE2 molecule between actin-nucleating and mTOR-inhibitory states remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified structural model of the activated, membrane-bound, phosphorylated WRC","Relative contributions of competing kinases (Abl, ERK, Cdk5, CK2, LRRK2) under a given stimulus undefined","Identity of the K45 ubiquitin ligase unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[20,21,0]},{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[2]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,7,10]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[14]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,2,7]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[20,48]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[7]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,2,5]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[10,11,14]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[3,35]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[22,13]}],"complexes":["WAVE regulatory complex (WAVE2-Abi1-Nap1-PIR121/Sra-1-HSPC300)"],"partners":["ABI1","NCKAP1","CYFIP1","BAIAP2","ABL1","CTTN","MTOR","MYH9"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9Y6W5","full_name":"Actin-binding protein WASF2","aliases":["Protein WAVE-2","Verprolin homology domain-containing protein 2","Wiskott-Aldrich syndrome protein family member 2","WASP family protein member 2"],"length_aa":498,"mass_kda":54.3,"function":"Downstream effector molecule involved in the transmission of signals from tyrosine kinase receptors and small GTPases to the actin cytoskeleton. Promotes formation of actin filaments. Part of the WAVE complex that regulates lamellipodia formation. The WAVE complex regulates actin filament reorganization via its interaction with the Arp2/3 complex","subcellular_location":"Cytoplasm, cytoskeleton; Cell projection, lamellipodium; Basolateral cell membrane","url":"https://www.uniprot.org/uniprotkb/Q9Y6W5/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/WASF2","classification":"Not Classified","n_dependent_lines":118,"n_total_lines":1208,"dependency_fraction":0.09768211920529801},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000158195","cell_line_id":"CID000550","localizations":[{"compartment":"cytoplasmic","grade":3},{"compartment":"membrane","grade":2}],"interactors":[{"gene":"NCKAP1","stoichiometry":10.0},{"gene":"CYFIP1","stoichiometry":10.0},{"gene":"BRK1","stoichiometry":10.0},{"gene":"SLC31A1","stoichiometry":4.0},{"gene":"WASF3","stoichiometry":4.0},{"gene":"CYFIP2","stoichiometry":4.0},{"gene":"ABI1","stoichiometry":4.0},{"gene":"HSBP1","stoichiometry":4.0},{"gene":"ACTB","stoichiometry":0.2},{"gene":"ACTG1","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/target/CID000550","total_profiled":1310},"omim":[{"mim_id":"621450","title":"ACTIN-RELATED PROTEIN 2/3 COMPLEX, SUBUNIT 5-LIKE; ARPC5L","url":"https://www.omim.org/entry/621450"},{"mim_id":"610917","title":"RAS-ASSOCIATED PROTEIN 34; RAB34","url":"https://www.omim.org/entry/610917"},{"mim_id":"606322","title":"CYTOPLASMIC FMRP-INTERACTING PROTEIN 1; CYFIP1","url":"https://www.omim.org/entry/606322"},{"mim_id":"605875","title":"WASP PROTEIN FAMILY, MEMBER 2; WASF2","url":"https://www.omim.org/entry/605875"},{"mim_id":"605068","title":"WASP PROTEIN FAMILY, MEMBER 3; WASF3","url":"https://www.omim.org/entry/605068"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Plasma membrane","reliability":"Approved"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/WASF2"},"hgnc":{"alias_symbol":["WAVE2","SCAR2"],"prev_symbol":[]},"alphafold":{"accession":"Q9Y6W5","domains":[{"cath_id":"1.10.150","chopping":"2-83","consensus_level":"medium","plddt":92.5559,"start":2,"end":83},{"cath_id":"1.20.5","chopping":"134-184","consensus_level":"medium","plddt":91.6194,"start":134,"end":184}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9Y6W5","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9Y6W5-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9Y6W5-F1-predicted_aligned_error_v6.png","plddt_mean":67.56},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=WASF2","jax_strain_url":"https://www.jax.org/strain/search?query=WASF2"},"sequence":{"accession":"Q9Y6W5","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9Y6W5.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9Y6W5/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9Y6W5"}},"corpus_meta":[{"pmid":"15048123","id":"PMC_15048123","title":"Abi1 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This complex is as active as WAVE2-Abi1 sub-complex in stimulating Arp2/3, and re-localizes to the leading edge of ruffles following Rac activation. RNAi inhibition of Abi1 abrogates Rac-dependent lamellipodia protrusion.\",\n      \"method\": \"Tandem mass spectrometry, Co-IP, in vitro actin polymerization assay, RNAi knockdown, live-cell imaging\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — multiple orthogonal methods (MS identification, in vitro reconstitution, RNAi with defined cellular phenotype, live imaging), single rigorous study\",\n      \"pmids\": [\"15048123\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"WAVE2 is specifically required for peripheral ruffle formation and directed cell migration (without ECM) downstream of PDGF stimulation in fibroblasts, whereas WAVE1 is required for dorsal ruffle formation. Loss of WAVE2 impairs leading-edge extension for directed migration.\",\n      \"method\": \"Gene-specific siRNA knockdown, live-cell migration assays, immunofluorescence\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KD with specific phenotypic readout, complemented by rescue and parallel WAVE1 comparisons\",\n      \"pmids\": [\"14536061\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"WAVE2 binds PtdIns(3,4,5)P3 through its basic domain. PtdIns(3,4,5)P3 produced by PI(3)K at the cell membrane is sufficient to recruit WAVE2 to the polarized membrane even in the presence of dominant-negative Rac; a lipid-binding-deficient full-length WAVE2 mutant inhibits proper lamellipodia formation.\",\n      \"method\": \"Lipid-binding assays, myristoylated PI3K expression, dominant-negative Rac, mutant WAVE2 expression, fluorescence microscopy\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — direct lipid-binding assay combined with mutagenesis and cellular rescue/inhibition experiments\",\n      \"pmids\": [\"15107862\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Genetic disruption of WAVE2 in mice causes embryonic lethality (~E10) with haemorrhages and impaired angiogenic sprouting/branching of endothelial cells; WAVE2-null endothelial cells fail to form lamellipodia at leading edges in response to VEGF, establishing WAVE2 as essential for Rac-regulated actin reorganization during angiogenesis in vivo.\",\n      \"method\": \"Gene-targeted knockout mouse, embryological analysis, endothelial cell migration and lamellipodia assays\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — constitutive KO mouse with defined developmental and cellular phenotypes, replicated in independent KO study (PMID:12853475)\",\n      \"pmids\": [\"12879075\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"WAVE2-deficient mouse embryonic fibroblasts exhibit severe defects in cell motility, lamellipodium formation, and Rac-mediated actin polymerization in response to PDGF, while proliferation is normal, establishing a non-redundant role for WAVE2 downstream of Rac in actin-based cell movement.\",\n      \"method\": \"Gene-targeted knockout mouse/MEFs, PDGF stimulation, actin polymerization and cell migration assays\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — constitutive KO with well-defined mechanistic phenotype, independent replication of WAVE2 KO\",\n      \"pmids\": [\"12853475\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Abi-1 couples WAVE2 to Abl kinase after cell stimulation, promoting Abl-mediated tyrosine phosphorylation of WAVE2 at Y150, which is required for WAVE2 activation, actin polymerization induction, and membrane translocation with activated Rac. Mutation of Y150 or disruption of WAVE2-Abi-1 binding impairs membrane actin rearrangement; Abl/Arg-null fibroblasts fail to phosphorylate WAVE2 or form membrane actin rearrangements.\",\n      \"method\": \"Co-IP, in vitro and in vivo phosphorylation assays, site-directed mutagenesis (Y150F), RNAi, fibroblast knockout cells\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — mutagenesis of phosphosite combined with Co-IP, in vitro kinase assay, and KO cell validation across two labs\",\n      \"pmids\": [\"15657136\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"c-Abl interacts with the WAVE2 complex via Abi-1 and phosphorylates WAVE2 on tyrosine 150 to activate membrane ruffling; WAVE2-Y150F rescue cells fail to ruffle or form microspikes, and RNAi of WAVE2 in Abl/Arg-null cells has no additive effect on membrane ruffling, placing Abl upstream of WAVE2 in this pathway.\",\n      \"method\": \"Co-IP, in vitro kinase assay, site-directed mutagenesis (Y150F), RNAi, genetic epistasis in Abl/Arg-null cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — mutagenesis, epistasis, and biochemical reconstitution; independently corroborated by PMID:15657136\",\n      \"pmids\": [\"16899465\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"WAVE2 complex (with Sra1/PIR121, Nap1, Abi1, HSPC300) isolated from the membrane fraction is fully active in stimulating Arp2/3 in an IRSp53-dependent manner in vitro, while cytosolic WAVE2 complex is not. Purified WAVE2 and WAVE2 complex are activated by IRSp53 in a Rac-dependent manner with PIP3-containing liposomes; IRSp53 knockdown reduces lamellipodia formation without decreasing WAVE2 complex levels.\",\n      \"method\": \"In vitro Arp2/3 activity assay, membrane fractionation, IRSp53 RNAi, purified protein reconstitution with PIP3 liposomes\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with purified components plus fractionation, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"16702231\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"ERK directly phosphorylates both WAVE2 and Abi1 within the WRC at lamellipodial leading edges. These phosphorylations are required for functional WRC interaction with Arp2/3 and actin during cell protrusion, as shown by phospho-deficient mutants failing to support protrusion.\",\n      \"method\": \"In vitro kinase assay, phospho-mutant analysis, co-localization by microscopy, cell protrusion assay\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — direct in vitro phosphorylation combined with phospho-mutant rescue and functional protrusion assays\",\n      \"pmids\": [\"21419341\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"WAVE2 is recruited to the T cell immunological synapse following TCR crosslinking, undergoes biochemical modification, and is required for actin cytoskeletal reorganization, beta-integrin-mediated adhesion, and calcium entry at a step distal to PLCgamma1 activation and IP3-mediated store release (CRAC channel activation).\",\n      \"method\": \"Co-IP, RNAi knockdown, live-cell imaging, calcium flux assays, integrin adhesion assays\",\n      \"journal\": \"Current biology : CB\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — combination of biochemical, genetic, and cell biology approaches defining multiple functional roles\",\n      \"pmids\": [\"16401421\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"WAVE2 VCA domain mediates formation of an Arp2/3-vinculin-talin signaling complex at the T cell immunological synapse; TCR stimulation induces WAVE2-ARP2/3-dependent F-actin nucleation leading to talin recruitment and high-affinity integrin binding to VCAM-1. Vinculin is required for talin recruitment but not for F-actin or integrin accumulation.\",\n      \"method\": \"RNAi knockdown, Co-IP, immunofluorescence, integrin binding assay (VCAM-1)\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP, RNAi with defined mechanistic phenotypes, and VCA domain mapping\",\n      \"pmids\": [\"17591693\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"The WAVE2 complex associates with Abl tyrosine kinase in T cells; TCR ligation induces WAVE2-dependent membrane recruitment of Abl. WAVE2 regulates TCR-mediated Rap1 activation via recruitment of CrkL-C3G exchange complex; Abl phosphorylates C3G to enable its GEF activity toward Rap1, controlling integrin clustering and affinity maturation.\",\n      \"method\": \"Co-IP, RNAi, dominant-negative constructs, Rap1 activation assay, integrin clustering assay\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP, RNAi with specific signaling pathway phenotype, mechanistic pathway dissection\",\n      \"pmids\": [\"18809728\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Cdk5 phosphorylates WAVE2 at Ser-137 in vitro, downstream of Fyn kinase activation by PDGF, to control oligodendrocyte precursor cell migration. WAVE2-S137A mutant impairs PDGF-dependent OPC migration.\",\n      \"method\": \"In vitro kinase assay, site-directed mutagenesis (S137A), retroviral shRNA knockdown, cell migration assay\",\n      \"journal\": \"The Journal of neuroscience : the official journal of the Society for Neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — in vitro phosphorylation assay with mutagenesis and functional cell migration readout\",\n      \"pmids\": [\"18701695\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"LRRK2 binds WAVE2 and phosphorylates it at Thr470, stabilizing WAVE2 and preventing its proteasomal degradation. LRRK2-G2019S (gain-of-function PD mutation) causes increased WAVE2-mediated phagocytic responses in macrophages/microglia; Lrrk2 loss causes the opposite. WAVE2 mediates LRRK2-G2019S-induced dopaminergic neuronal death.\",\n      \"method\": \"Co-IP, in vitro kinase assay, proteasome inhibitor treatment, siRNA knockdown, macrophage/microglia phagocytosis assay, in vivo mouse model\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — in vitro kinase assay identifying phosphosite, Co-IP, KO/KI mouse models, and in vivo rescue\",\n      \"pmids\": [\"29760073\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Conditional T cell-specific ablation of WAVE2 causes severe autoimmunity with increased mTOR activation. WAVE2 directly bound mTOR and inhibited its activation by impeding mTOR interactions with RAPTOR and RICTOR. Both T cell defects and autoimmunity were ameliorated by pharmacological mTOR inhibitors.\",\n      \"method\": \"Conditional KO mouse, Co-IP (WAVE2-mTOR direct binding), mTOR inhibitor rescue, phosphoproteomic/metabolic analysis\",\n      \"journal\": \"Science (New York, N.Y.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO with in vivo phenotype, direct Co-IP demonstrating WAVE2-mTOR interaction, pharmacological rescue\",\n      \"pmids\": [\"33766857\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Dysbindin-1 forms a ternary complex with WAVE2 and Abi-1 in neurons (but not N-WASP); dysbindin-1 promotes binding of WAVE2 to Abi-1. RNAi knockdown of dysbindin-1 generates abnormally elongated immature dendritic protrusions, implicating the complex in dendritic spine morphogenesis.\",\n      \"method\": \"Co-IP, immunofluorescence, RNAi knockdown in hippocampal neurons\",\n      \"journal\": \"Molecular psychiatry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — Co-IP identifying ternary complex, RNAi with morphological phenotype; single lab\",\n      \"pmids\": [\"20531346\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"ERK2 directly phosphorylates WAVE2 in vitro at sites in the proline-rich region and VCA domain. Phosphorylation of the VCA region increases its affinity for Arp2/3 but paradoxically reduces Arp2/3-mediated actin polymerization activity in vitro.\",\n      \"method\": \"In vitro kinase assay with ERK2, actin polymerization assay, binding assay\",\n      \"journal\": \"Journal of biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — direct in vitro kinase/polymerization assay but single lab, no in vivo validation of functional consequence\",\n      \"pmids\": [\"17202194\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"MAP kinase phosphorylation sites within WAVE2 regulate persistent cell migration and Golgi polarization; fibroblasts expressing phospho-defective WAVE2 show increased migration speed, decreased persistence, and disrupted Golgi polarization—effects mimicked by acute WAVE2 RNAi knockdown.\",\n      \"method\": \"Site-directed mutagenesis of MAP kinase phosphosites, transgene expression, scratch-wound migration assay, RNAi\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mutagenesis with functional migration readout confirmed by RNAi phenocopy, single lab\",\n      \"pmids\": [\"18032787\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Casein kinase 2 (CK2) phosphorylates five serine residues (482, 484, 488, 489, 497) in the WAVE2 VCA domain; phosphorylation is required for high-affinity Arp2/3 interaction, while phosphorylation of Ser482/484 specifically inhibits Arp2/3 activation. Non-phosphorylatable alanine mutations inhibit WAVE2-dependent cell ruffling and leading-edge integrity in vivo.\",\n      \"method\": \"In vitro CK2 phosphorylation, mutagenesis, Arp2/3 binding/activation assay, cell ruffling assay\",\n      \"journal\": \"Cell motility and the cytoskeleton\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Weak — in vitro kinase assay with mutagenesis and cellular readout, single lab\",\n      \"pmids\": [\"19012317\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Abi1 knockout cells display reduced WAVE1 and WAVE2 protein levels along with Nap1 and Sra-1/PIR121, demonstrating that Abi1 is required for the stability and integrity of the entire WAVE complex. Abi1 KO causes decreased migration rate and distance but increased directional persistence, without affecting peripheral ruffling but impairing dorsal ruffling.\",\n      \"method\": \"Conditional Abi1 KO mouse/MEFs, Western blot of complex components, migration assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO with defined complex stability and migration phenotypes, multiple readouts\",\n      \"pmids\": [\"21482783\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"The basic region of WAVE2 (between WH1 and CRIB domains) binds ADP actin filaments, enhancing Arp2/3 branching efficiency on pre-existing ADP filaments by ~2-fold compared to VCA domain alone. This basic region is required for actin-based bead motility in cytosol; VCA domain alone or constructs lacking the basic region fail to support bead movement.\",\n      \"method\": \"In vitro actin polymerization/branching assay, bead motility assay in brain cytosol, deletion constructs\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with purified components and deletion mutagenesis; functionally validated with bead motility\",\n      \"pmids\": [\"11792818\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"The basic region of WAVE2 is required for actin-based motility in cell extracts; beads coated with full-length WAVE2 but not WAVE2 lacking the basic clusters (Delta basic) or VCA alone support movement in brain cytosol, and VCA/Delta-basic constructs are much less able to induce actin polymerization in cytosol.\",\n      \"method\": \"Polystyrene bead motility assay in brain cytosol, in vitro actin polymerization assay, deletion constructs\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution (bead motility, actin polymerization), deletion mutagenesis; corroborates PMID:11792818\",\n      \"pmids\": [\"11401525\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"WAVE2 is required for Rac1-induced membrane ruffling, invasion into ECM, and pulmonary metastasis of B16F10 melanoma cells. WAVE2 acts as the primary downstream effector of Rac to achieve invasion; co-expression of RacCA and WAVE2 in parental B16 cells additively increases invasiveness beyond RacCA alone.\",\n      \"method\": \"RNAi knockdown, constitutively active Rac co-expression, Matrigel invasion assay, in vivo metastasis assay\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — RNAi KD with in vitro and in vivo metastasis phenotypes, genetic epistasis via RacCA co-expression\",\n      \"pmids\": [\"15608687\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"WAVE2 directly binds Abl kinase and activates HIV-1 Arp2/3-dependent actin polymerization; Tiam-1 (Rac GEF) associates with IRSp53 to link Rac to the WAVE2 complex. Rac and Abl activate the WAVE2 complex for pore expansion at the hemifusion stage of HIV-1 entry; siRNA knockdown of WAVE2, Abl, IRSp53, or Arp3 attenuates HIV-1 fusion and infection.\",\n      \"method\": \"siRNA knockdown, fusion assay, virus-cell infection assay, Abl kinase inhibitors (imatinib, nilotinib, dasatinib), fluorescence microscopy with membrane curving agents\",\n      \"journal\": \"PLoS pathogens\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple siRNA targets and pharmacological inhibition with functional readouts; pathway dissection by epistasis\",\n      \"pmids\": [\"20585556\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"HIV-1 gp120 binding to CXCR4 or CCR5 triggers WAVE2 phosphorylation at serine 351 via both Gαi-dependent and -independent pathways; WAVE2-mediated Arp2/3 activity is required for HIV-1 nuclear migration. Stable shRNA knockdown of Arp3 or Arp2/3 inhibitor CK548 prevented HIV-1 nuclear migration and infection of CD4 T cells.\",\n      \"method\": \"Phosphorylation mapping, shRNA knockdown, Arp2/3 inhibitor, HIV-1 infection/nuclear migration assay in primary cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — site-specific phosphorylation identified, shRNA and pharmacological inhibition with nuclear migration readout; single lab\",\n      \"pmids\": [\"24415754\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"IL-2 activates WAVE2 in NK cells to enable WASp-independent F-actin accumulation at the immunological synapse and NK cell cytotoxicity. WAVE2 was required for IL-2-induced WASp-independent NK function but not for baseline innate NK activity, defining WAVE2 and WASp as parallel pathways to F-actin reorganization.\",\n      \"method\": \"WASp inhibitor, WAS patient cells, siRNA knockdown of WAVE2, NK cytotoxicity assay, F-actin quantification at IS\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — patient cells combined with WASp inhibitor and siRNA, defined functional phenotype; single lab\",\n      \"pmids\": [\"21383498\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"WAVE2 regulates meiotic spindle stability, peripheral positioning, and polar body emission in mouse oocytes via an actin-mediated pathway. siRNA-mediated and antibody-mediated disruption of WAVE2 causes failure of chromosome congression, spindle formation, spindle positioning, polar body extrusion, actin cap and cortical granule-free domain formation. WAVE2 regulation of chromosome migration is independent of microtubules.\",\n      \"method\": \"siRNA knockdown, antibody microinjection, immunofluorescence, nocodazole treatment (microtubule depletion)\",\n      \"journal\": \"Cell cycle (Georgetown, Tex.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — two independent disruption methods (siRNA + antibody) with specific meiotic phenotypes; single lab\",\n      \"pmids\": [\"21543895\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Pak1 constitutively binds WAVE2 and is transported with WAVE2 to the leading edge upon HGF stimulation. Pak1 mediates kinesin-dependent WAVE2 transport along microtubules by phosphorylating stathmin/Op18 at Ser38 and recruiting phospho-stathmin to the kinesin-WAVE2 complex. Pak1 inhibition or depletion abrogates HGF-induced WAVE2 transport and lamellipodia formation.\",\n      \"method\": \"Co-IP, siRNA knockdown of Pak1, Pak1 inhibitor (IPA-3), phospho-specific antibodies, lamellipodia assay\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — Co-IP plus pharmacological and siRNA inhibition with cellular phenotype; single lab\",\n      \"pmids\": [\"19162178\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Kinesin heavy chain KIF5B forms a complex with WAVE2 and IQGAP1; HGF-induced WAVE2 transport to the cell periphery and lamellipodia formation require KIF5B-mediated transport along microtubules in a Rac1-dependent manner. Downregulation of KIF5B or microtubule depolymerization abrogates WAVE2 transport.\",\n      \"method\": \"Co-IP (WAVE2-KIF5B), siRNA knockdown of KIF5B, nocodazole treatment, lamellipodia quantification\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — Co-IP combined with siRNA and pharmacological inhibition with cellular phenotype; single lab\",\n      \"pmids\": [\"18514191\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"PKA forms a complex with WAVE2 in breast cancer cells and brain extracts; two separate regions of WAVE2 mediate PKA binding. WAVE2 serves as an A-kinase-anchoring protein (AKAP) that recruits PKA to membrane protrusions; WAVE2 depletion impairs PKA localization at protrusions and PKA activation-induced enlargement of membrane protrusions.\",\n      \"method\": \"Co-IP, siRNA knockdown, PKA activator treatment, immunofluorescence of protrusion size\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — Co-IP with domain mapping, siRNA with functional readout; single lab\",\n      \"pmids\": [\"21119216\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"WAVE2 complex is required for Rac-Abi-1-dependent actin recruitment and entry of Chlamydia trachomatis into epithelial cells; siRNA depletion of WAVE2 and Abi-1 abrogates chlamydia-induced actin recruitment and significantly reduces pathogen uptake. C. trachomatis infection promotes Rac interaction with WAVE2 and Abi-1 but not with IRSp53.\",\n      \"method\": \"Co-IP, siRNA knockdown, bacterial invasion/infection assay, immunofluorescence\",\n      \"journal\": \"Cellular microbiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — Co-IP plus siRNA with specific infection phenotype; single lab\",\n      \"pmids\": [\"17501982\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"WAVE2-Abi1 complex is required for CSF-1-induced F-actin protrusions and macrophage migration. WAVE2 and Abi1 are co-recruited to protrusions; reducing WAVE2 by dominant-negative, antibody, or RNAi impairs CSF-1-elicited actin protrusions, and targeting Abi1 reduces WAVE2 levels and impairs migration.\",\n      \"method\": \"Dominant-negative expression, antibody microinjection, RNAi, Co-IP, cell migration assay\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — three independent disruption methods with consistent phenotype; single lab\",\n      \"pmids\": [\"16280551\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Membrane targeting of WAVE2 alone is insufficient for WAVE2-dependent actin polymerization; IRSp53 links Rac1 to WAVE2-Abi1 in a Rac1-activation-dependent immunoprecipitable complex in macrophages. Reduction of IRSp53 or expression of IRSp53 lacking the WAVE2-binding SH3 domain significantly reduces Rac1 association with WAVE2 and Abi1, and diminishes CSF-1-induced protrusions and migration.\",\n      \"method\": \"RNAi, Co-IP, dominant-negative IRSp53, membrane-targeted WAVE2 expression, migration/protrusion assays\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — RNAi combined with Co-IP and dominant-negative approaches; mechanistically informative negative finding on membrane targeting\",\n      \"pmids\": [\"18198193\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Cortactin directly binds both WAVE2 and Arp2/3 at the epithelial zonula adherens; both interactions are necessary for actin assembly at the ZA. Cortactin binding to the cadherin cytoplasmic tail was demonstrated by cell-free protein expression and fluorescent single-molecule coincidence assays.\",\n      \"method\": \"Cell-free protein expression, fluorescent single-molecule coincidence assay, siRNA knockdown, in vitro binding assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Weak — direct binding demonstrated by novel in vitro approach; single lab, limited replication\",\n      \"pmids\": [\"24469447\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"WAVE2 and mDia1 interact directly with IRSp53 within filopodia, as shown by acceptor photobleaching FRET. mDia1 and WAVE2 synergize with IRSp53 to form filopodia; depletion of either mDia1 or WAVE2 decreases IRSp53-induced filopodia formation.\",\n      \"method\": \"Acceptor photobleaching FRET, siRNA knockdown, time-lapse imaging of filopodium formation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct FRET evidence for in-cell protein interaction combined with functional depletion assay; single lab\",\n      \"pmids\": [\"22179776\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"WAVE2-Abi2 complex activity is regulated by Abl kinase (via Y150 phosphorylation) and Cdk5 (via S137 phosphorylation) to control growth cone activity and the multipolar-to-bipolar neuronal transition, as well as initiation of glia-guided migration in the developing neocortex.\",\n      \"method\": \"In utero electroporation, mutagenesis (Y150, S137), time-lapse imaging of migrating neurons\",\n      \"journal\": \"Cerebral cortex (New York, N.Y. : 1991)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo mutagenesis at known phosphosites with defined developmental phenotype; single lab\",\n      \"pmids\": [\"22617848\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"WAVE2 is required for efficient invasion of polarized epithelial cells by Salmonella typhimurium. Disruption of the PIR121/Nap1/Abi1/WAVE2/HSPC300 pentameric complex potently inhibits bacterial uptake, while the IRSp53/WAVE2 complex is not required for invasion despite being formed during infection.\",\n      \"method\": \"siRNA knockdown, dominant-negative complex disruption, bacterial invasion/internalization assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — siRNA and dominant-negative with specific bacterial invasion phenotype; dissection of which complex is relevant\",\n      \"pmids\": [\"15929989\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"N-WASP and WAVE2 act downstream of phosphatidylinositol 3-kinase to mediate HGF-induced lamellipodia formation and myogenic cell migration; dominant-negative WAVE2 or WAVE2 RNAi prevents HGF-induced lamellipodial formation and both non-directional and directional migration of C2C12 myoblasts.\",\n      \"method\": \"Dominant-negative expression, RNAi knockdown, PI3K inhibitor (LY294002), cell migration and chemotaxis assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — dominant-negative plus RNAi with functional phenotypes, pathway placed downstream of PI3K; single lab\",\n      \"pmids\": [\"15496413\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Nonmuscle myosin IIA (MYH9) constitutively associates with WAVE2 in a myosin II activity-dependent manner; the MYH9-WAVE2 complex co-localizes to PIP3 at the leading edge after IGF-I stimulation. Depletion of MYH9 or inhibition of myosin II by blebbistatin abrogates F-actin arc and lamellipodia formation, indicating MYH9 is required for lamellipodia through binding to WAVE2.\",\n      \"method\": \"Co-IP (identified by mass spectrometry), siRNA knockdown, blebbistatin treatment, immunofluorescence\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — Co-IP with MS identification, pharmacological and siRNA inhibition with cellular phenotype; single lab\",\n      \"pmids\": [\"21184743\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Cortactin phosphorylation on S405/S418 by PLCβ3-PKCδ downstream of MCP1/CCR2/Gαq11 signaling is required for cortactin interaction with WAVE2; this interaction mediates G-actin polymerization, F-actin stress fiber formation, and smooth muscle cell migration.\",\n      \"method\": \"Co-IP, siRNA knockdown of PLCβ3/PKCδ/CCR2/Gαq11, phosphomimetic/phosphodeficient mutants, actin polymerization and migration assays\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — Co-IP showing phosphorylation-dependent interaction, siRNA epistasis with functional readout; single lab\",\n      \"pmids\": [\"26490115\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"SKAP2 physically associates with both WAVE2 and cortactin and inhibits their interaction; cortactin is required for membrane localization of WAVE2, and SKAP2 suppresses WAVE2/cortactin-mediated actin polymerization in vitro. SKAP2 knockdown enhances WAVE2 translocation to cell membrane and accelerates cell migration in a SKAP2-WAVE2 binding-dependent manner.\",\n      \"method\": \"Co-IP, in vitro actin polymerization assay, siRNA knockdown, cell migration assay, binding-deficient mutant\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — in vitro reconstitution of SKAP2 suppression, Co-IP, siRNA with functional readout; single lab\",\n      \"pmids\": [\"23161539\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Following T cell activation, WAVE2 undergoes ubiquitylation at lysine 45 (mapped by mutagenesis), leading to proteasomal degradation. The autoinhibitory conformation of the WRC stabilizes WAVE2 in resting cells (shown by FRET); release of autoinhibition upon activation exposes K45 to ubiquitylation and degradation.\",\n      \"method\": \"FRET (to detect WRC conformational state), ubiquitylation assays, mutagenesis (K45), proteasome inhibitor treatment, T cell activation\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — FRET conformational assay combined with mutagenesis and biochemical ubiquitylation mapping; single lab\",\n      \"pmids\": [\"28332566\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"WAVE2 recruitment to the TCR signaling site requires ZAP-70, LAT, SLP-76, and Nck (similar to WASp). However, unlike WASp, WAVE2 leaves this complex and migrates peripherally with vinculin to the membrane leading edge. These dynamics were demonstrated using FRET and triple-color FRET technology in live T cells.\",\n      \"method\": \"FRET, triple-color FRET (3FRET), siRNA knockdown, live T cell imaging\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — FRET-based live-cell demonstration of complex dynamics and pathway position; single lab\",\n      \"pmids\": [\"25342748\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Hem-1 (Nap1) scaffold loss leads to degradation of the entire WAVE2 complex and loss of c-Abl survival signaling from the complex, causing failure of fetal liver HSC engraftment in bone marrow. This engraftment defect is not due to defects in actin-dependent chemotaxis, homing, or adhesion, but to loss of Abl signaling.\",\n      \"method\": \"Hem-1 KO mouse, HSC transplantation, homing/migration/adhesion assays, Western blot of complex components, Abl signaling analysis\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO mouse with genetic dissection separating actin function from Abl signaling function of the complex; single lab\",\n      \"pmids\": [\"29915352\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Vinexin beta interacts with the proline-rich region of WAVE2 through its first and second SH3 domains and increases WAVE2 protein levels by reducing proteasomal degradation in a PKA-dependent manner. PKA activation alone increases WAVE2 expression; PKA inhibition suppresses vinexin-induced WAVE2 increase.\",\n      \"method\": \"Co-IP, domain mapping by mutagenesis, proteasome inhibitor treatment, PKA activation/inhibition, Western blot\",\n      \"journal\": \"Genes to cells : devoted to molecular & cellular mechanisms\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — Co-IP with domain mapping and pharmacological modulation; single lab\",\n      \"pmids\": [\"16483316\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"NESH/Abi-3 forms a WAVE2 complex that is functionally distinct from the Abi-1-based WAVE2 complex: NESH/Abi-3 neither binds c-Abl nor promotes c-Abl-mediated WAVE2 phosphorylation, and expression of NESH/Abi-3 reduces WAVE2 translocation to the plasma membrane and disrupts lamellipodial protrusion. A linker region between proline-rich regions and the SH3 domain of Abi-1 is required for its c-Abl interaction and c-Abl-mediated WAVE2 phosphorylation.\",\n      \"method\": \"Co-IP, domain mapping, imatinib inhibition, siRNA, fluorescence microscopy of WAVE2 localization\",\n      \"journal\": \"Cell communication and signaling : CCS\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — Co-IP with domain mutagenesis, pharmacological and genetic dissection; single lab\",\n      \"pmids\": [\"26428302\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"TrkC activation by neurotrophin-3 leads to ERK-dependent phosphorylation of WAVE2 at Thr346 and Ser351, causing a WAVE2 mobility shift; mutagenesis of these sites or ERK inhibition abolishes TrkC-induced WAVE2 shift and podocyte migration. WAVE2 shRNA knockdown abolishes TrkC-induced podocyte migration.\",\n      \"method\": \"Mutagenesis of ERK phosphosites (T346/S351), ERK inhibition, shRNA knockdown, podocyte migration assay\",\n      \"journal\": \"FASEB journal : official publication of the Federation of American Societies for Experimental Biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — mutagenesis of phosphosites with functional migration readout and shRNA confirmation; single lab\",\n      \"pmids\": [\"29162704\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"WAVE2 knockdown in 3D epithelial acini causes cadherin isoform switching (decreased E-cadherin, increased N-cadherin) and upregulation of Twist1 mRNA; knockdown of Twist1 in WAVE2-KD cells reverses cadherin switching and rescues the aberrant morphological phenotype. Abl kinase activity is increased in WAVE2-KD cells, and Abl inhibition rescues the multi-lobular phenotype, placing WAVE2 upstream as a repressor of Abl/Twist1 activity.\",\n      \"method\": \"shRNA knockdown, 3D acini culture, Abl inhibitor (STI571), Twist1 knockdown rescue, qRT-PCR, immunostaining\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — siRNA with pathway rescue by Twist1 KD and Abl inhibition, epistasis; single lab\",\n      \"pmids\": [\"23691243\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"WAVE1 and WAVE2 are redundant for lamellipodia formation and motility in B16-F1 melanoma cells; however, WAVE2 KO decreases the rate of leading-edge actin extension while WAVE1 KO increases it. WAVE1 restricts the rate of actin extension and couples actin networks to the membrane to drive protrusion.\",\n      \"method\": \"CRISPR knockout of WAVE1 and WAVE2 individually and together, leading-edge actin extension measurement, retrograde flow measurement\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — CRISPR KO of both isoforms separately and in combination with quantitative actin dynamics measurements; single lab\",\n      \"pmids\": [\"32697617\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"HSPC300 interacts with WAVE2 protein and its silencing results in WAVE2 degradation in vitro, indicating HSPC300 is required for WAVE2 stability within the complex.\",\n      \"method\": \"siRNA knockdown, Western blot of WAVE2 levels, Co-immunoprecipitation\",\n      \"journal\": \"Lung cancer (Amsterdam, Netherlands)\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single pulldown/siRNA observation in cancer cell lines; single lab\",\n      \"pmids\": [\"19576655\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"WAVE2 (WASF2) is a core component of the pentameric WAVE regulatory complex (WRC; with Abi1/Abi2, Nap1, Sra-1/PIR121, and HSPC300) that relays upstream signals from Rac GTPase and PtdIns(3,4,5)P3 to the Arp2/3 complex, driving branched actin nucleation for lamellipodia, membrane ruffles, and directed cell migration; its activity is controlled by multiple phosphorylation events (Abl at Y150, Cdk5 at S137, ERK at T346/S351 and other sites, CK2 at VCA serines), ubiquitylation at K45 coupled to WRC conformational changes, and scaffolding interactions with IRSp53, cortactin, kinesin/IQGAP1, MYH9, PKA, and mTOR, with Abi1 being essential for both complex integrity and Abl-mediated WAVE2 activation, and WAVE2 itself also functioning as a direct inhibitor of mTOR to maintain T cell homeostasis.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"WASF2 (WAVE2) is a nucleation-promoting factor that converts upstream Rac and phosphoinositide signals into branched actin polymerization at the cell periphery, driving lamellipodia, membrane ruffles, and directed migration [#1, #4]. It functions as the core catalytic subunit of a pentameric complex with Abi1, Nap1, PIR121/Sra-1, and HSPC300, which is fully competent to stimulate the Arp2/3 complex and relocalizes to the leading edge upon Rac activation [#0]. Membrane recruitment and activation are governed by the WAVE2 basic region binding PtdIns(3,4,5)P3 produced by PI3K [#2], by IRSp53 linking active Rac to the membrane-associated complex [#7, #32], and by the basic region engaging ADP-actin filaments to enhance Arp2/3 branching [#20, #21]. Genetic ablation confirms a non-redundant requirement for WAVE2 in Rac/PDGF-driven lamellipodium formation and motility, and in VEGF-dependent endothelial sprouting during angiogenesis, where loss causes embryonic lethality with hemorrhage [#3, #4]. WAVE2 activity is tuned by a network of phosphorylation events: Abi1-dependent recruitment of Abl kinase phosphorylates Tyr150 to activate the complex [#5, #6], Cdk5 phosphorylates Ser137 [#12], and ERK phosphorylates the proline-rich and VCA regions (including Thr346/Ser351) to control protrusion, persistence, and Golgi polarization [#8, #17, #46]; CK2 phosphorylation of VCA serines modulates Arp2/3 binding and activation [#18]. Complex integrity itself is a control point, as Abi1, Nap1/Hem-1, and HSPC300 are each required for WAVE2 stability, and release of WRC autoinhibition upon activation exposes Lys45 to ubiquitylation and proteasomal degradation [#19, #43, #41]. Beyond actin nucleation, WAVE2 serves broader roles in immune cells: at the T cell immunological synapse it couples Arp2/3-driven F-actin to vinculin/talin recruitment and integrin affinity maturation via an Abl–CrkL–C3G–Rap1 axis [#10, #11], and it directly binds and inhibits mTOR—impeding RAPTOR and RICTOR association—to restrain mTOR signaling and prevent autoimmunity [#14]. WAVE2 is also exploited by pathogens for actin-dependent invasion and by tumor cells for Rac-driven invasion and metastasis [#22, #36].\",\n  \"teleology\": [\n    {\n      \"year\": 2001,\n      \"claim\": \"Established that beyond the canonical VCA module, the WAVE2 basic region directly engages actin filaments and is itself essential for actin-based motility, refining how the protein nucleates branched networks.\",\n      \"evidence\": \"In vitro actin branching and bead-motility assays in brain cytosol with deletion constructs\",\n      \"pmids\": [\"11792818\", \"11401525\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not place the basic region in the context of the assembled pentameric complex\", \"Structural basis of ADP-filament recognition not resolved\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Defined non-redundant, isoform-specific roles by showing WAVE2 is required for peripheral ruffling and directed migration downstream of Rac/PDGF in vivo, distinct from WAVE1.\",\n      \"evidence\": \"Gene-specific siRNA and knockout mice/MEFs with migration and lamellipodia readouts; angiogenesis phenotype\",\n      \"pmids\": [\"14536061\", \"12853475\", \"12879075\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular composition of the active complex not yet defined\", \"Mechanism of Rac-to-WAVE2 coupling unresolved at this stage\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Resolved the activation input architecture by identifying the WAVE2–Abi1–Nap1–PIR121 complex and showing PtdIns(3,4,5)P3 recruits WAVE2 to the membrane via its basic domain.\",\n      \"evidence\": \"Tandem MS, Co-IP, in vitro Arp2/3 assays, lipid-binding assays, mutant rescue, RNAi\",\n      \"pmids\": [\"15048123\", \"15107862\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How lipid binding and Rac signaling are integrated kinetically not defined\", \"HSPC300 not yet placed in the complex here\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Identified the first activating phosphorylation, establishing Abi1-dependent Abl phosphorylation of WAVE2 Tyr150 as required for activation and membrane translocation.\",\n      \"evidence\": \"Co-IP, in vitro/in vivo kinase assays, Y150F mutagenesis, Abl/Arg-null fibroblasts\",\n      \"pmids\": [\"15657136\", \"16899465\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How Tyr150 phosphorylation alters WRC conformation not defined\", \"Stimulus specificity of Abl recruitment unresolved\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Spatially resolved activation by showing only the membrane-associated WAVE2 complex is Arp2/3-active, and is switched on by IRSp53 in a Rac/PIP3-dependent manner.\",\n      \"evidence\": \"Membrane fractionation, purified-protein reconstitution with PIP3 liposomes, IRSp53 RNAi\",\n      \"pmids\": [\"16702231\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Why cytosolic complex is inactive at the molecular level not fully defined\", \"IRSp53 stoichiometry within the complex unresolved\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Extended WAVE2 function to immune cells, defining its requirement at the T cell synapse for actin reorganization, integrin adhesion, and calcium entry distal to PLCγ1.\",\n      \"evidence\": \"Co-IP, RNAi, live imaging, calcium flux and integrin adhesion assays\",\n      \"pmids\": [\"16401421\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Link between actin and CRAC channel activation mechanistically unclear\", \"Identity of the WAVE2 biochemical modification not defined here\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Dissected synapse signaling output, showing WAVE2 recruits Abl and the CrkL–C3G complex to activate Rap1 and control integrin affinity maturation, and identified Cdk5/Ser137 as a migration-controlling input in neural cells.\",\n      \"evidence\": \"Co-IP, RNAi, dominant-negatives, Rap1 activation assays; in vitro kinase assay and S137A mutagenesis\",\n      \"pmids\": [\"18809728\", \"18701695\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How distinct phosphosites are coordinated not defined\", \"Whether Rap1 axis operates outside T cells unknown\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Established complex stability as a regulatory node and identified ERK as a direct WRC kinase required for productive Arp2/3 engagement during protrusion.\",\n      \"evidence\": \"Abi1 conditional KO with complex Western blots; in vitro ERK kinase assay with phospho-mutant rescue and protrusion assays\",\n      \"pmids\": [\"21482783\", \"21419341\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the WAVE2 ubiquitin ligase not addressed\", \"How ERK phosphorylation integrates with Abl/CK2 inputs unclear\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Connected conformation to turnover, showing WRC autoinhibition stabilizes WAVE2 while activation exposes Lys45 for ubiquitylation and degradation.\",\n      \"evidence\": \"FRET conformational sensing, K45 mutagenesis, ubiquitylation and proteasome-inhibitor assays in T cells\",\n      \"pmids\": [\"28332566\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Responsible E3 ligase not identified\", \"Single-lab finding awaiting independent confirmation\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Revealed actin-independent functions of the complex—WAVE2 stabilization by LRRK2 phosphorylation in disease and Hem-1-dependent Abl survival signaling separable from actin dynamics.\",\n      \"evidence\": \"In vitro kinase assays, Co-IP, proteasome inhibition, KO mouse models and HSC transplantation\",\n      \"pmids\": [\"29760073\", \"29915352\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether LRRK2 and Abl phosphosites cooperate unknown\", \"Mechanism linking complex to survival signaling not fully defined\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Demonstrated a non-actin role: WAVE2 directly binds and inhibits mTOR by blocking RAPTOR/RICTOR association, maintaining T cell homeostasis and preventing autoimmunity.\",\n      \"evidence\": \"T cell-specific conditional KO, Co-IP, mTOR-inhibitor rescue, phosphoproteomics\",\n      \"pmids\": [\"33766857\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of WAVE2–mTOR binding undefined\", \"Whether mTOR inhibition occurs outside T cells unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the many phosphorylation, ubiquitylation, and scaffolding inputs are integrated in time and space to switch a single WAVE2 molecule between actin-nucleating and mTOR-inhibitory states remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified structural model of the activated, membrane-bound, phosphorylated WRC\", \"Relative contributions of competing kinases (Abl, ERK, Cdk5, CK2, LRRK2) under a given stimulus undefined\", \"Identity of the K45 ubiquitin ligase unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [20, 21, 0]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [2]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 7, 10]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [14]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 2, 7]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [20, 48]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [7]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 2, 5]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [10, 11, 14]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [3, 35]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [22, 13]}\n    ],\n    \"complexes\": [\n      \"WAVE regulatory complex (WAVE2-Abi1-Nap1-PIR121/Sra-1-HSPC300)\"\n    ],\n    \"partners\": [\n      \"ABI1\",\n      \"NCKAP1\",\n      \"CYFIP1\",\n      \"BAIAP2\",\n      \"ABL1\",\n      \"CTTN\",\n      \"MTOR\",\n      \"MYH9\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}