{"gene":"NCKIPSD","run_date":"2026-06-10T05:19:52","timeline":{"discoveries":[{"year":2001,"finding":"WISH/NCKIPSD binds N-WASP through its SH3 domain and Ash/Grb2 through proline-rich regions, and strongly enhances N-WASP-induced Arp2/3 complex activation independent of Cdc42 in vitro, leading to rapid actin polymerization. Coexpression of WISH and N-WASP induced microspike formation even with a Cdc42-binding-deficient N-WASP mutant (H208D). WISH also activated actin polymerization in N-WASP-depleted brain extracts, indicating both N-WASP-dependent and -independent pathways to Arp2/3 activation.","method":"In vitro Arp2/3 actin polymerization assay, co-immunoprecipitation, N-WASP depletion from brain extracts, cell overexpression, domain-binding assays","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1/2 / Strong — in vitro reconstitution of Arp2/3 activation, N-WASP depletion rescue, mutant analysis, and cellular phenotype all in one study","pmids":["11157975"],"is_preprint":false},{"year":2001,"finding":"SPIN90/NCKIPSD was identified as an Nck-binding protein via yeast two-hybrid screening; it binds the first and third SH3 domains of Nck in vitro. SPIN90 contains an SH3 domain, proline-rich motifs, a serine/threonine-rich region, and a C-terminal hydrophobic region. It is colocalized with Nck at sarcomere Z-discs in cardiac myocytes, and antisera against SPIN90 disrupts sarcomere structure.","method":"Yeast two-hybrid, in vitro binding assay, immunofluorescence colocalization, antibody microinjection phenotype","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — yeast two-hybrid identification plus in vitro binding validation plus cellular phenotype upon antibody perturbation","pmids":["11278500"],"is_preprint":false},{"year":2000,"finding":"AF3p21/NCKIPSD was identified as a novel MLL fusion partner in therapy-related leukemia with t(3;11)(p21;q23). The AF3p21 protein (722 aa) contains an SH3 domain, proline-rich domain, and bipartite nuclear localization signal (NLS). In the MLL-AF3p21 fusion, exon 6 of MLL fuses to exon 2 of AF3p21, producing a chimeric protein with MLL AT-hooks and AF3p21 proline-rich domain and NLS but lacking the AF3p21 SH3 domain.","method":"Genomic DNA library screening, RNA analysis, sequencing of fusion junction","journal":"Blood","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct cloning and sequencing from patient leukemic cells, single study","pmids":["10648423"],"is_preprint":false},{"year":2001,"finding":"AF3p21/NCKIPSD has a homo-oligomerization domain demonstrated by mammalian two-hybrid system, making it structurally analogous to MLL fusion partners AF10 and AF17.","method":"Mammalian two-hybrid system","journal":"Leukemia & lymphoma","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single method (two-hybrid), single lab, no orthogonal validation","pmids":["11697487"],"is_preprint":false},{"year":2003,"finding":"SPIN90/NCKIPSD phosphorylation is regulated by ERK1 (activated by cell adhesion and PDGF) and modulates interaction with Nck. SPIN90 binds betaPIX, WASP, and ERK1 as identified by in vitro binding and yeast two-hybrid. The betaPIX.WASP.SPIN90 complex interacts with Nck in a cell adhesion-dependent manner (abolished in suspended or cytochalasin D-treated cells, restored on fibronectin); SPIN90 phosphorylation by ERK promotes this complex–Nck interaction.","method":"Yeast two-hybrid, in vitro binding assays, co-immunoprecipitation, cell adhesion manipulation, ERK kinase assay, overexpression of SH3/PRD domain constructs","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (yeast two-hybrid, in vitro binding, co-IP, kinase assay, domain overexpression with phenotype) in single rigorous study","pmids":["14559906"],"is_preprint":false},{"year":2005,"finding":"SPIN90/NCKIPSD redistributes to the cell cortex and promotes lamellipodia/membrane ruffle formation in response to PDGF in COS-7 cells; knockdown abolishes this redistribution. The C-terminus of SPIN90 binds both the Arp2/3 complex and G-actin in vitro, and this binding activates Arp2/3 to drive actin polymerization. When coexpressed with PI4P5-kinase, SPIN90 localizes to actin comet tails.","method":"siRNA knockdown, PDGF stimulation assay, in vitro Arp2/3 activation assay (C-terminal domain binding), actin comet tail coexpression assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1/2 / Strong — in vitro Arp2/3 activation reconstitution plus knockdown cellular phenotype plus actin comet tail assay","pmids":["16253999"],"is_preprint":false},{"year":2005,"finding":"SPIN90/NCKIPSD binds dynamin I in presynaptic compartments through SH3-PRD interaction (pull-down and co-immunoprecipitation), and participates in synaptic vesicle endocytosis. Both overexpression and siRNA knockdown of SPIN90 impaired synaptic vesicle endocytosis, and endocytic defects from overexpression were rescued by abolishing SPIN90–dynamin I interaction. Exocytosis kinetics were unaffected.","method":"Pull-down, co-immunoprecipitation, siRNA knockdown, overexpression, FM dye-based synaptic vesicle endocytosis assay, rescue experiments","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP plus functional endocytosis assay with knockdown, overexpression, and rescue experiments","pmids":["16221862"],"is_preprint":false},{"year":2006,"finding":"SPIN90/NCKIPSD binds the SH3 domain of syndapin via its proline-rich domain (in vitro and in vivo) and also associates with clathrin. Overexpression of SPIN90 or its PRD domain (syndapin-binding domain) inhibited transferrin uptake (clathrin-mediated endocytosis), and this inhibition was reversed by co-expression of syndapin. SPIN90 knockdown (antibody microinjection or siRNA) also inhibited transferrin internalization. SPIN90 co-localizes with EEA1/Rab5 early endosomes and travels with moving vesicles in live cells.","method":"Yeast two-hybrid, in vitro pull-down, co-immunoprecipitation, transferrin uptake assay, siRNA knockdown, antibody microinjection, live-cell time-lapse imaging","journal":"Genes to cells","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (binding assay, co-IP, functional endocytosis assay with knockdown and rescue, live imaging) in single study","pmids":["16999739"],"is_preprint":false},{"year":2006,"finding":"SPIN90/NCKIPSD localizes to dendritic spines where it associates with PSD-95. Overexpression increased dendritic filopodia/spine number and length via an N-WASP-independent mechanism; siRNA knockdown reduced spine density. PSD-95-induced spinogenesis was abolished by SPIN90 knockdown. In response to chemically induced LTP, SPIN90 redistributed to dendritic spines in association with PSD-95.","method":"Co-immunoprecipitation (SPIN90 with PSD-95), siRNA knockdown, overexpression, chemical LTP induction, immunofluorescence localization in neurons","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP, siRNA knockdown with spine phenotype, overexpression, LTP-induced redistribution, multiple orthogonal methods","pmids":["16990791"],"is_preprint":false},{"year":2007,"finding":"The SH3 domains of SPIN90/NCKIPSD and Src directly bind palladin's poly-proline sequence (in vitro). SPIN90–palladin interaction controls intracellular targeting of SPIN90. Palladin and SPIN90 co-localize in PDGF-induced membrane ruffles/lamellipodia. Knockdown of SPIN90 did not inhibit Src-induced cytoskeletal rearrangement, whereas palladin knockdown caused cytoskeletal disorganization and inhibited remodeling. Palladin is tyrosine phosphorylated by active Src.","method":"In vitro binding (direct SH3-polyproline), co-immunoprecipitation, siRNA knockdown, active Src overexpression, immunofluorescence colocalization","journal":"Experimental cell research","confidence":"High","confidence_rationale":"Tier 2 / Moderate — direct in vitro binding, co-IP, siRNA knockdown with cytoskeletal phenotype, multiple methods in one study","pmids":["17537434"],"is_preprint":false},{"year":2009,"finding":"SPIN90/NCKIPSD is a novel binding partner for Shank proteins in the PSD (co-immunoprecipitation from brain lysates). SPIN90 and Shank co-localize in postsynaptic dendrites and synergistically mediate spine maturation and spine head enlargement. SPIN90 overexpression causes accumulation of Shank and PSD-95 in dendritic spines. In SPIN90 knockout mice, PSD protein composition is altered and actin cytoskeleton in hippocampal neurons is abnormal.","method":"Co-immunoprecipitation from brain lysates, overexpression, SPIN90 knockout mice, immunofluorescence","journal":"Journal of neurochemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — co-IP from brain, knockout mouse phenotype, overexpression, multiple orthogonal methods","pmids":["19302483"],"is_preprint":false},{"year":2009,"finding":"SPIN90/NCKIPSD forms a complex with IRSp53 mediated through direct association of SPIN90's PRD with the SH3 domain of IRSp53 (in vivo co-immunoprecipitation). SPIN90 and IRSp53 cooperate to mediate Rac activation, co-localizing at leading edges in PDGF-treated cells. SPIN90 siRNA knockdown reduced lamellipodia and IRSp53 localization at protrusions. Competitive inhibition of SPIN90–IRSp53 binding via SPIN90 PRD dramatically reduced ruffle formation.","method":"Co-immunoprecipitation, siRNA knockdown, domain competitive inhibition, immunofluorescence colocalization, PDGF stimulation","journal":"Experimental cell research","confidence":"High","confidence_rationale":"Tier 2 / Moderate — in vivo co-IP, siRNA knockdown with membrane ruffle phenotype, domain competition, multiple methods","pmids":["19460367"],"is_preprint":false},{"year":2009,"finding":"In DIP/WISH (NCKIPSD)-deficient mouse embryonic fibroblasts, Rho activity is constitutively elevated, cell motility and adhesion are impaired, and cells display many stress fibers due to clustering of pre-existing actin filaments. DIP/WISH thus functions as a negative regulator of Rho and modulates cell adhesion by controlling integration of adhesion molecules.","method":"Knockout mouse-derived MEFs, Rho activity assay, cell motility assay, immunofluorescence for stress fibers/adhesion","journal":"Genes to cells","confidence":"High","confidence_rationale":"Tier 2 / Moderate — knockout-derived cells with defined molecular phenotype (Rho activity) and cellular readouts","pmids":["19778379"],"is_preprint":false},{"year":2011,"finding":"SPIN90/NCKIPSD is enriched in growth cones and neuronal shafts in young hippocampal neurons, with localization dependent on F-actin. SPIN90 knockout reduces growth cone area, filopodial number, total neurite length, and Cdc42 activity compared to wild-type neurons.","method":"SPIN90 knockout neurons, immunocytochemistry, F-actin co-localization, growth cone morphometry, Cdc42 activity assay","journal":"Experimental cell research","confidence":"High","confidence_rationale":"Tier 2 / Moderate — knockout neurons with multiple quantitative readouts (growth cone area, filopodia, neurite length, Cdc42 activity)","pmids":["21763308"],"is_preprint":false},{"year":2013,"finding":"SPIN90/NCKIPSD is tyrosine phosphorylated by Src kinase (in vitro and in vivo kinase assays). Phospho-SPIN90 is targeted to dendritic spines in hippocampal neurons. A phospho-deficient mutant fails to accumulate at spines or bind PSD-95/Shank efficiently; phospho-mimicking mutant localizes to spines and binds PSD-95/Shank with increased efficiency. Neurons overexpressing SPIN90 WT or phospho-mimicking mutant display enlarged spine heads and enhanced postsynaptic function (increased EPSC amplitude and frequency).","method":"In vitro kinase assay, in vivo kinase assay, phospho-deficient/mimetic mutants, immunofluorescence localization, electrophysiology (EPSC recording)","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 1/2 / Strong — in vitro and in vivo kinase assay, mutagenesis, electrophysiological functional readout","pmids":["23342115"],"is_preprint":false},{"year":2013,"finding":"SPIN90/NCKIPSD knockdown attenuates EGFR endocytosis: knockdown cells have higher surface EGFR, fewer EGFR-containing endosomes, smaller endosome size, and delayed early endosomal targeting. Domain overexpression (SH3, PRD, CC domains) causes aberrant Rab5-positive endosome morphology and defective endosomal movement. SPIN90 knockdown-enhanced EGFR stability leads to elevated ERK1/2 activation and increased cyclin D1-dependent cell proliferation.","method":"Stable siRNA knockdown, electron microscopy of EGFR distribution, fluorescent confocal microscopy of endosomes, surface EGFR quantification, domain overexpression, cell proliferation assay, ERK1/2 activation assay","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 / Strong — stable knockdown with multiple orthogonal readouts (EM, confocal, biochemistry, proliferation) plus domain dissection","pmids":["24340049"],"is_preprint":false},{"year":2013,"finding":"SPIN90/NCKIPSD is dephosphorylated by STEP61 (striatal-enriched protein tyrosine phosphatase) upon NMDA stimulation and translocates from dendritic spines to dendritic shafts. Phosphorylated SPIN90 binds cofilin and inhibits its actin-severing activity; dephosphorylation releases cofilin for actin depolymerization. A phosphomimetic mutant (SPIN90 YE) remained in spines after NMDAR activation, bound cofilin, and prevented actin depolymerization, cortactin/drebrin redistribution, and spine shrinkage.","method":"NMDA stimulation of neurons, phosphatase identification (STEP61), co-immunoprecipitation of phospho-SPIN90 with cofilin, phosphomimetic/phospho-deficient mutants, immunofluorescence of spine morphology, cortactin/drebrin redistribution assays","journal":"Cellular and molecular life sciences","confidence":"High","confidence_rationale":"Tier 2 / Strong — identified writer (STEP61), substrate interaction (cofilin), functional mutant analysis, multiple orthogonal cellular readouts","pmids":["23765104"],"is_preprint":false},{"year":2017,"finding":"SPIN90/NCKIPSD depletion in stromal fibroblasts facilitates recruitment of mDia2 and APC complex to microtubules, resulting in increased microtubule acetylation. This promotes nuclear localization of YAP, which upregulates myofibroblast marker gene expression on soft matrices, driving cancer-associated fibroblast (CAF) activation. In vivo, Spin90 deficiency enhanced tumor progression, and blockade of microtubule acetylation in CAF inhibited tumor growth in mice.","method":"Spin90 knockout mouse-derived fibroblasts, microtubule acetylation assay, mDia2/APC co-immunoprecipitation/recruitment assay, YAP nuclear localization by imaging, myofibroblast marker qPCR, orthotopic breast cancer mouse model","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 2 / Strong — knockout MEFs with defined molecular pathway (mDia2/APC→microtubule acetylation→YAP) plus in vivo tumor model validation","pmids":["28652253"],"is_preprint":false},{"year":2019,"finding":"SPIN90/NCKIPSD acts as an adaptor that facilitates Rab5 activation during EGF-mediated endocytosis. SPIN90 binds inactive Rab5/GDI2 complex through its C-terminus. ERK-mediated phosphorylation of SPIN90 at Thr-242 in response to EGF signaling enables SPIN90 to bind the GEF Gapex5 through its N-terminal SH3 domain, mediating Gapex5–Rab5 proximity and Rab5 activation on endosomal membranes.","method":"Co-immunoprecipitation, phosphorylation-site mutation (Thr-242), domain mapping, EGF stimulation, Rab5 activation assay, endosomal localization","journal":"Experimental & molecular medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — phospho-site identified, domain-specific interactions mapped by co-IP, functional Rab5 activation assay with mutation rescue","pmids":["31358736"],"is_preprint":false},{"year":2019,"finding":"In Spin90-knockout MEFs, extra domain A-containing fibronectin (FN+EDA) is upregulated, promotes fibril formation in ECM, and specifically interacts with integrin α4β1. FN+EDA from Spin90-KO MEFs increases breast cancer cell proliferation, migration, and invasion. Irigenin, which blocks integrin α4β1–FN+EDA interaction, inhibited fibril formation by KO MEFs and reduced tumor growth and lung metastases in orthotopic mouse models.","method":"Spin90-knockout MEFs, FN+EDA Western blot/IF, integrin co-immunoprecipitation, breast cancer cell co-culture proliferation/migration/invasion assays, orthotopic mouse model, pharmacological inhibition with irigenin","journal":"Journal of cellular physiology","confidence":"High","confidence_rationale":"Tier 2 / Strong — knockout model, identified mediating receptor (integrin α4β1), pharmacological rescue, in vivo validation","pmids":["31637720"],"is_preprint":false},{"year":2020,"finding":"In vitro, SPIN90/NCKIPSD promotes formation of unbranched actin filaments by Arp2/3. In cells, SPIN90 favors a formin-dominated cortex. Two mechanisms account for this: (1) efficient recruitment of mDia1 to SPIN90-Arp2/3 nucleated filaments, and (2) formation of a ternary SPIN90-Arp2/3-mDia1 complex that greatly enhances filament nucleation. Both mechanisms yield rapidly elongating filaments with mDia1 at barbed ends and SPIN90-Arp2/3 at pointed ends. In networks, SPIN90 lowers branching density and increases the proportion of long mDia1-elongated filaments.","method":"In vitro actin polymerization reconstitution, TIRF microscopy of single filaments, ternary complex formation assay, cell cortex analysis","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with single-molecule TIRF, ternary complex characterization, mechanistic dissection of two distinct pathways","pmids":["32572169"],"is_preprint":false},{"year":2022,"finding":"miR-130b-3p directly downregulates SPIN90/NCKIPSD in stromal fibroblasts. Ectopic expression of miR-130b-3p in fibroblasts accelerated their differentiation to CAFs and promoted cancer cell motility, associated with SPIN90 downregulation. miR-130b-3p is generated in luminal A-type cancer cells and delivered to fibroblasts via exosomes.","method":"miRNA target validation (ectopic expression, luciferase reporter implied), fibroblast differentiation assay, exosome delivery assay, cancer cell motility assay, patient tissue correlation","journal":"Oncogenesis","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — functional miRNA-mediated SPIN90 downregulation with CAF differentiation readout, exosome mechanism, but abstract does not detail direct 3'UTR luciferase validation","pmids":["35948548"],"is_preprint":false}],"current_model":"NCKIPSD (SPIN90/WISH) is an SH3 domain-containing adaptor protein that regulates actin cytoskeletal dynamics by activating the Arp2/3 complex directly (via its C-terminus binding G-actin and Arp2/3) and through N-WASP in a Cdc42-independent manner; it recruits mDia1 to form a ternary SPIN90-Arp2/3-mDia1 complex that nucleates long, rapidly elongating actin filaments, thereby shifting cortical networks toward formin-dominated architectures. SPIN90 scaffolds multiple protein complexes—including Nck, betaPIX, WASP, IRSp53, syndapin, dynamin I, PSD-95, and Shank—to coordinate lamellipodia formation, clathrin-mediated endocytosis (including EGFR endocytosis via Rab5/Gapex5 activation), and synaptic vesicle recycling. In neurons, SPIN90's Src kinase-dependent tyrosine phosphorylation targets it to dendritic spines to promote spinogenesis and synaptic potentiation, while NMDA-induced dephosphorylation by STEP61 releases cofilin to drive actin depolymerization and spine shrinkage; in fibroblasts, SPIN90 loss elevates Rho activity, impairs motility, and triggers microtubule acetylation-dependent YAP nuclear translocation that drives cancer-associated fibroblast activation."},"narrative":{"mechanistic_narrative":"NCKIPSD (SPIN90/WISH/DIP) is an SH3- and proline-rich-domain adaptor that organizes actin cytoskeletal dynamics by directly engaging the Arp2/3 complex and scaffolding multiple actin regulators [PMID:11157975, PMID:16253999, PMID:32572169]. It enhances N-WASP-induced Arp2/3 activation in a Cdc42-independent manner, and its own C-terminus binds both G-actin and the Arp2/3 complex to drive actin polymerization [PMID:11157975, PMID:16253999]. Beyond promoting branched nucleation, NCKIPSD recruits the formin mDia1 to Arp2/3-nucleated filaments and forms a ternary SPIN90-Arp2/3-mDia1 complex that nucleates long, rapidly elongating unbranched filaments, biasing cortical networks toward a formin-dominated architecture [PMID:32572169]. Through its SH3 domain and proline-rich region it links Nck, betaPIX/WASP/ERK1, IRSp53, syndapin, and dynamin I into adhesion- and growth-factor-responsive complexes that build lamellipodia and membrane ruffles and execute clathrin-mediated and EGFR endocytosis [PMID:11278500, PMID:14559906, PMID:19460367, PMID:16221862, PMID:16999739, PMID:24340049]; in the endocytic pathway, ERK-dependent phosphorylation at Thr-242 enables NCKIPSD to bridge the GEF Gapex5 to inactive Rab5/GDI2 and activate Rab5 on endosomes [PMID:31358736]. In neurons, NCKIPSD associates with PSD-95 and Shank at dendritic spines to promote spinogenesis and spine maturation, with Src-dependent tyrosine phosphorylation targeting it to spines and enhancing postsynaptic function, while NMDA-induced dephosphorylation by STEP61 releases cofilin to drive actin depolymerization and spine shrinkage [PMID:16990791, PMID:19302483, PMID:23342115, PMID:23765104]. In fibroblasts, loss of NCKIPSD elevates Rho activity and impairs motility, and drives microtubule acetylation-dependent YAP nuclear translocation and ECM remodeling that activate cancer-associated fibroblasts [PMID:19778379, PMID:28652253, PMID:31637720]. NCKIPSD was originally identified as the AF3p21 MLL fusion partner in therapy-related leukemia bearing t(3;11)(p21;q23) [PMID:10648423].","teleology":[{"year":2000,"claim":"Established NCKIPSD as a gene of clinical relevance by identifying it as a novel MLL fusion partner, defining its domain architecture (SH3, proline-rich domain, NLS) before any cytoskeletal function was known.","evidence":"Genomic cloning and fusion-junction sequencing from therapy-related leukemia cells with t(3;11)(p21;q23)","pmids":["10648423"],"confidence":"Medium","gaps":["Does not establish a functional role for the fusion protein","Loss of the SH3 domain in the fusion leaves the chimera's mechanism undefined"]},{"year":2001,"claim":"Defined the core biochemical activity of NCKIPSD: it binds N-WASP via its SH3 domain and strongly potentiates N-WASP/Arp2/3-driven actin polymerization independent of Cdc42, establishing it as an actin nucleation regulator.","evidence":"In vitro Arp2/3 polymerization assays, co-IP, N-WASP-depleted brain extract rescue, and N-WASP mutant (H208D) cell assays","pmids":["11157975"],"confidence":"High","gaps":["Did not resolve the N-WASP-independent route to Arp2/3 activation at the molecular level","Physiological trigger for the activity in cells not defined"]},{"year":2001,"claim":"Identified NCKIPSD as an Nck-binding adaptor localizing to sarcomere Z-discs, framing it as a structural scaffold whose perturbation disrupts cytoskeletal organization.","evidence":"Yeast two-hybrid, in vitro SH3-binding assays, immunofluorescence, and antibody microinjection in cardiac myocytes","pmids":["11278500"],"confidence":"High","gaps":["Mechanism linking Nck binding to Z-disc maintenance not established","Cardiac function relevance untested"]},{"year":2003,"claim":"Connected NCKIPSD scaffolding to signaling by showing ERK1 phosphorylation regulates assembly of a betaPIX/WASP/SPIN90 complex with Nck in an adhesion-dependent manner.","evidence":"Yeast two-hybrid, in vitro binding, co-IP, ERK kinase assays, and adhesion manipulation","pmids":["14559906"],"confidence":"High","gaps":["Specific ERK phospho-sites not mapped in this study","Downstream actin output of the complex not quantified"]},{"year":2005,"claim":"Demonstrated NCKIPSD's direct, autonomous Arp2/3 activity (C-terminus binds G-actin and Arp2/3) and tied it to growth-factor-induced cortical actin remodeling.","evidence":"siRNA knockdown, PDGF stimulation, in vitro Arp2/3 activation with C-terminal domain, actin comet tail coexpression","pmids":["16253999"],"confidence":"High","gaps":["Relative contribution of direct versus N-WASP-mediated Arp2/3 activation in cells unresolved","Structural basis of C-terminal Arp2/3/G-actin binding unknown"]},{"year":2005,"claim":"Extended NCKIPSD function to membrane trafficking by showing it binds dynamin I and is required for synaptic vesicle endocytosis.","evidence":"Pull-down, reciprocal co-IP, knockdown/overexpression, FM-dye endocytosis assays and interaction-disruption rescue","pmids":["16221862"],"confidence":"High","gaps":["Whether actin nucleation activity is required for the endocytic role not separated","Coupling to the dynamin fission step mechanistically undefined"]},{"year":2006,"claim":"Generalized the endocytic role to clathrin-mediated endocytosis via syndapin and clathrin binding, and placed NCKIPSD on Rab5/EEA1 early endosomes.","evidence":"Yeast two-hybrid, pull-down, co-IP, transferrin uptake with rescue, knockdown, and live-cell imaging","pmids":["16999739"],"confidence":"High","gaps":["How NCKIPSD switches between dynamin and syndapin partners not defined","Vesicle-stage specificity of its action unclear"]},{"year":2006,"claim":"Established a neuronal structural role: NCKIPSD associates with PSD-95 and drives spinogenesis through an N-WASP-independent mechanism.","evidence":"Reciprocal co-IP, siRNA knockdown, overexpression spine morphometry, and chemical LTP-induced redistribution","pmids":["16990791"],"confidence":"High","gaps":["Molecular identity of the N-WASP-independent actin pathway in spines not specified","Direct PSD-95 binding interface not mapped"]},{"year":2007,"claim":"Identified palladin as a determinant of NCKIPSD intracellular targeting, distinguishing NCKIPSD-dependent from Src/palladin-dependent cytoskeletal remodeling.","evidence":"Direct in vitro SH3-polyproline binding, co-IP, knockdown, and active-Src overexpression with colocalization","pmids":["17537434"],"confidence":"High","gaps":["Functional consequence of palladin-directed targeting on actin output not quantified","Hierarchy of palladin versus other targeting cues unknown"]},{"year":2009,"claim":"Defined cooperative cytoskeletal and synaptic modules: NCKIPSD partners IRSp53 to drive Rac-dependent lamellipodia, and Shank to mediate spine maturation, with knockout altering PSD composition.","evidence":"Co-IP, siRNA knockdown, domain competition, knockout mice, and immunofluorescence across two studies","pmids":["19460367","19302483"],"confidence":"High","gaps":["Whether IRSp53 and Shank modules are spatially distinct pools not addressed","Mechanism of Rac activation downstream of IRSp53 binding unresolved"]},{"year":2009,"claim":"Revealed NCKIPSD as a negative regulator of Rho controlling adhesion and motility, using knockout fibroblasts.","evidence":"Knockout MEFs with Rho activity assays, motility and adhesion readouts, stress-fiber imaging","pmids":["19778379"],"confidence":"High","gaps":["Molecular mechanism by which NCKIPSD suppresses Rho not defined","Link between Rho regulation and Arp2/3 nucleation function unclear"]},{"year":2011,"claim":"Showed NCKIPSD supports neuronal growth-cone morphogenesis and Cdc42 activity, linking it to early neurite development.","evidence":"Knockout neurons, F-actin colocalization, growth-cone morphometry, Cdc42 activity assay","pmids":["21763308"],"confidence":"High","gaps":["How NCKIPSD promotes Cdc42 activity mechanistically unknown","Relationship to its Cdc42-independent Arp2/3 activity not reconciled"]},{"year":2013,"claim":"Established Src-dependent tyrosine phosphorylation as the switch that targets NCKIPSD to spines and enhances synaptic function.","evidence":"In vitro/in vivo kinase assays, phospho-deficient/mimetic mutants, localization, and EPSC electrophysiology","pmids":["23342115"],"confidence":"High","gaps":["Phospho-site(s) governing PSD-95/Shank binding not fully resolved","Upstream signals activating Src toward NCKIPSD undefined"]},{"year":2013,"claim":"Defined the reverse switch and a direct actin-depolymerization mechanism: STEP61 dephosphorylates NCKIPSD upon NMDA stimulation, releasing bound cofilin to drive spine shrinkage.","evidence":"NMDA stimulation, STEP61 identification, phospho-SPIN90/cofilin co-IP, phosphomimetic mutants, spine and cortactin/drebrin imaging","pmids":["23765104"],"confidence":"High","gaps":["Structural basis of phospho-dependent cofilin sequestration not determined","How this integrates with NCKIPSD's Arp2/3-nucleating role in the same spine unclear"]},{"year":2013,"claim":"Connected NCKIPSD to receptor signaling output by showing it promotes EGFR endocytosis, with its loss stabilizing surface EGFR, elevating ERK1/2 and driving proliferation.","evidence":"Stable knockdown with EM, confocal endosome analysis, surface EGFR quantification, domain dissection, and proliferation assays","pmids":["24340049"],"confidence":"High","gaps":["Step at which NCKIPSD acts in EGFR endosomal maturation not pinpointed here","Generality across other receptor cargoes untested"]},{"year":2017,"claim":"Defined a tumor-microenvironment mechanism: NCKIPSD loss in fibroblasts recruits mDia2/APC to microtubules, raising microtubule acetylation and YAP nuclear translocation to drive CAF activation and tumor progression.","evidence":"Knockout MEFs, microtubule acetylation and recruitment assays, YAP imaging, marker qPCR, orthotopic breast cancer model","pmids":["28652253"],"confidence":"High","gaps":["How NCKIPSD normally restrains mDia2/APC microtubule recruitment unknown","Direct molecular link between acetylation and YAP nuclear entry not resolved"]},{"year":2019,"claim":"Resolved the molecular logic of NCKIPSD-driven Rab5 activation: ERK phosphorylation at Thr-242 lets NCKIPSD bridge Gapex5 (SH3) to inactive Rab5/GDI2 (C-terminus) on endosomes.","evidence":"Co-IP, Thr-242 mutation, domain mapping, EGF stimulation, and Rab5 activation assays","pmids":["31358736"],"confidence":"High","gaps":["Whether the same phospho-event coordinates other endocytic partners unaddressed","Kinetic ordering relative to dynamin/syndapin steps unknown"]},{"year":2019,"claim":"Showed NCKIPSD loss remodels the ECM, upregulating FN+EDA that signals through integrin alpha4beta1 to enhance breast cancer aggressiveness, a druggable axis.","evidence":"Knockout MEFs, FN+EDA Western/IF, integrin co-IP, co-culture invasion assays, orthotopic model, irigenin inhibition","pmids":["31637720"],"confidence":"High","gaps":["Mechanism by which NCKIPSD restrains FN+EDA expression not defined","Cytoskeletal versus transcriptional contribution to ECM phenotype unseparated"]},{"year":2020,"claim":"Reconceived NCKIPSD's actin function: rather than only promoting branching, it nucleates unbranched filaments via Arp2/3 and forms a ternary SPIN90-Arp2/3-mDia1 complex that produces long formin-elongated filaments, shifting cortex architecture.","evidence":"In vitro reconstitution, single-molecule TIRF microscopy, ternary complex assays, and cell cortex network analysis","pmids":["32572169"],"confidence":"High","gaps":["How this ternary-complex pathway is regulated by the upstream signaling/phospho-switches not connected","Relative in vivo prevalence versus N-WASP-branched nucleation unresolved"]},{"year":2022,"claim":"Identified an upstream regulatory layer: cancer-cell-derived exosomal miR-130b-3p downregulates NCKIPSD in fibroblasts to drive CAF differentiation.","evidence":"miR-130b-3p ectopic expression, exosome delivery, fibroblast differentiation and cancer motility assays, patient tissue correlation","pmids":["35948548"],"confidence":"Medium","gaps":["Direct 3'UTR binding not detailed in this evidence","Whether miRNA-driven NCKIPSD loss recapitulates the full mDia2/YAP and FN+EDA phenotypes untested"]},{"year":null,"claim":"How NCKIPSD's signal-driven phospho-switches integrate its competing actin-nucleating, formin-recruiting, and cofilin-sequestering activities at a single subcellular location remains unresolved.","evidence":"","pmids":[],"confidence":"High","gaps":["No structural model of the autonomous Arp2/3-activating C-terminus","No unified model reconciling Cdc42-independent Arp2/3 activation with the observed Cdc42 and Rho regulation","Mechanism of the MLL-AF3p21 fusion in leukemogenesis uncharacterized"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor 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human amnionic WISH cells by various stimuli occurs through distinct intracellular mechanisms.","date":"1997","source":"The Journal of pharmacology and experimental therapeutics","url":"https://pubmed.ncbi.nlm.nih.gov/9023325","citation_count":14,"is_preprint":false},{"pmid":"10397407","id":"PMC_10397407","title":"Interleukin-4 differentially regulates prostaglandin production in amnion-derived WISH cells stimulated with pro-inflammatory cytokines and epidermal growth factor.","date":"1999","source":"Prostaglandins, leukotrienes, and essential fatty acids","url":"https://pubmed.ncbi.nlm.nih.gov/10397407","citation_count":14,"is_preprint":false},{"pmid":"2548953","id":"PMC_2548953","title":"Comparative study on the antiviral activity of tumor necrosis factor (TNF)-alpha, lymphotoxin/TNF-beta, and IL-1 in WISH cells.","date":"1989","source":"Immunology 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How to choose the appropriate medium and culture system for the model you wish to create.","date":"1998","source":"Methods in cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/9648097","citation_count":13,"is_preprint":false},{"pmid":"33855648","id":"PMC_33855648","title":"\"I wish that there was more info\": characterizing the uncertainty experienced by carriers of pathogenic ATM and/or CHEK2 variants.","date":"2021","source":"Familial cancer","url":"https://pubmed.ncbi.nlm.nih.gov/33855648","citation_count":13,"is_preprint":false},{"pmid":"15194005","id":"PMC_15194005","title":"Stimulation of early gene induction and cell proliferation by lysophosphatidic acid in human amnion-derived WISH cells: role of phospholipase D-mediated pathway.","date":"2004","source":"Biochemical pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/15194005","citation_count":13,"is_preprint":false},{"pmid":"9845672","id":"PMC_9845672","title":"Effects of interleukin-4 on the expression and activity of prostaglandin endoperoxide H synthase-2 in amnion-derived WISH cells.","date":"1998","source":"Journal of molecular endocrinology","url":"https://pubmed.ncbi.nlm.nih.gov/9845672","citation_count":13,"is_preprint":false},{"pmid":"15028418","id":"PMC_15028418","title":"Hydrogen peroxide induced apoptosis in amnion-derived WISH cells is not inhibited by vitamin C.","date":"2004","source":"Placenta","url":"https://pubmed.ncbi.nlm.nih.gov/15028418","citation_count":13,"is_preprint":false},{"pmid":"6416868","id":"PMC_6416868","title":"The HLA proteins and a related protein of 28 kDa are preferentially induced by interferon-gamma in human WISH cells.","date":"1983","source":"European journal of immunology","url":"https://pubmed.ncbi.nlm.nih.gov/6416868","citation_count":13,"is_preprint":false},{"pmid":"19460367","id":"PMC_19460367","title":"SPIN90-IRSp53 complex participates in Rac-induced membrane ruffling.","date":"2009","source":"Experimental cell 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CMLS","url":"https://pubmed.ncbi.nlm.nih.gov/23765104","citation_count":11,"is_preprint":false},{"pmid":"10611063","id":"PMC_10611063","title":"Corticotropin-releasing hormone increases the expression of the prostaglandin E(2) receptor subtype EP1 in amnion WISH cells.","date":"2000","source":"Biology of reproduction","url":"https://pubmed.ncbi.nlm.nih.gov/10611063","citation_count":11,"is_preprint":false},{"pmid":"19133983","id":"PMC_19133983","title":"Fluorescence-activated cell sorting (FACS) of whole mount in situ hybridization (WISH) labelled haematopoietic cell populations in the zebrafish.","date":"2009","source":"British journal of haematology","url":"https://pubmed.ncbi.nlm.nih.gov/19133983","citation_count":11,"is_preprint":false},{"pmid":"10554762","id":"PMC_10554762","title":"Cyclooxygenase inhibitors decrease apoptosis initiated by actinomycin D, cycloheximide, and staurosporine in amnion-derived WISH cells.","date":"1999","source":"Journal of the Society for Gynecologic Investigation","url":"https://pubmed.ncbi.nlm.nih.gov/10554762","citation_count":11,"is_preprint":false},{"pmid":"19778379","id":"PMC_19778379","title":"DIP/WISH-deficient mice reveal Dia- and N-WASP-interacting protein as a regulator of cytoskeletal dynamics in embryonic fibroblasts.","date":"2009","source":"Genes to cells : devoted to molecular & cellular mechanisms","url":"https://pubmed.ncbi.nlm.nih.gov/19778379","citation_count":10,"is_preprint":false},{"pmid":"10760470","id":"PMC_10760470","title":"Subcellular localization and PKC-dependent regulation of the human lysophospholipase A/acyl-protein thioesterase in WISH cells.","date":"2000","source":"Biochimica et biophysica acta","url":"https://pubmed.ncbi.nlm.nih.gov/10760470","citation_count":10,"is_preprint":false},{"pmid":"33362560","id":"PMC_33362560","title":"IL-6 but Not TNFα Levels Are Associated With Time to Pregnancy in Female Rheumatoid Arthritis Patients With a Wish to Conceive.","date":"2020","source":"Frontiers in 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1989)","url":"https://pubmed.ncbi.nlm.nih.gov/9870076","citation_count":9,"is_preprint":false},{"pmid":"12570726","id":"PMC_12570726","title":"WISH cells as a model for the \"in vitro\" study of amnion pathophysiology.","date":"2003","source":"Current drug targets. Immune, endocrine and metabolic disorders","url":"https://pubmed.ncbi.nlm.nih.gov/12570726","citation_count":9,"is_preprint":false},{"pmid":"2472992","id":"PMC_2472992","title":"Enhancement of interferon-induced 2-5 oligoadenylate synthetase activity by retinoic acid in human histiocytic lymphoma U937 cells and WISH cells.","date":"1989","source":"Differentiation; research in biological diversity","url":"https://pubmed.ncbi.nlm.nih.gov/2472992","citation_count":9,"is_preprint":false},{"pmid":"11496900","id":"PMC_11496900","title":"Diagnostics and treatment of HIV-discordant couples who wish to have children.","date":"2001","source":"European journal of medical research","url":"https://pubmed.ncbi.nlm.nih.gov/11496900","citation_count":9,"is_preprint":false},{"pmid":"21763308","id":"PMC_21763308","title":"Control of growth cone motility and neurite outgrowth by SPIN90.","date":"2011","source":"Experimental cell research","url":"https://pubmed.ncbi.nlm.nih.gov/21763308","citation_count":8,"is_preprint":false},{"pmid":"10883892","id":"PMC_10883892","title":"Anticancer drug action on poly(A) polymerase activity and isoforms during HeLa and WISH cell apoptosis.","date":"2000","source":"The International journal of biological markers","url":"https://pubmed.ncbi.nlm.nih.gov/10883892","citation_count":8,"is_preprint":false},{"pmid":"15983118","id":"PMC_15983118","title":"Despite transcriptional and functional coordination, cyclooxygenase-2 and microsomal prostaglandin E synthase-1 largely reside in distinct lipid microdomains in WISH epithelial cells.","date":"2005","source":"The journal of histochemistry and cytochemistry : official journal of the Histochemistry Society","url":"https://pubmed.ncbi.nlm.nih.gov/15983118","citation_count":8,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":49787,"output_tokens":6663,"usd":0.124653,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":15520,"output_tokens":6452,"usd":0.11945,"stage2_stop_reason":"end_turn"},"total_usd":0.244103,"stage1_batch_id":"msgbatch_013a8chtv3AWyTqv4z4sEF4C","stage2_batch_id":"msgbatch_01AHsuW63vinsvuTgzmQ3n62","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2001,\n      \"finding\": \"WISH/NCKIPSD binds N-WASP through its SH3 domain and Ash/Grb2 through proline-rich regions, and strongly enhances N-WASP-induced Arp2/3 complex activation independent of Cdc42 in vitro, leading to rapid actin polymerization. Coexpression of WISH and N-WASP induced microspike formation even with a Cdc42-binding-deficient N-WASP mutant (H208D). WISH also activated actin polymerization in N-WASP-depleted brain extracts, indicating both N-WASP-dependent and -independent pathways to Arp2/3 activation.\",\n      \"method\": \"In vitro Arp2/3 actin polymerization assay, co-immunoprecipitation, N-WASP depletion from brain extracts, cell overexpression, domain-binding assays\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 / Strong — in vitro reconstitution of Arp2/3 activation, N-WASP depletion rescue, mutant analysis, and cellular phenotype all in one study\",\n      \"pmids\": [\"11157975\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"SPIN90/NCKIPSD was identified as an Nck-binding protein via yeast two-hybrid screening; it binds the first and third SH3 domains of Nck in vitro. SPIN90 contains an SH3 domain, proline-rich motifs, a serine/threonine-rich region, and a C-terminal hydrophobic region. It is colocalized with Nck at sarcomere Z-discs in cardiac myocytes, and antisera against SPIN90 disrupts sarcomere structure.\",\n      \"method\": \"Yeast two-hybrid, in vitro binding assay, immunofluorescence colocalization, antibody microinjection phenotype\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — yeast two-hybrid identification plus in vitro binding validation plus cellular phenotype upon antibody perturbation\",\n      \"pmids\": [\"11278500\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"AF3p21/NCKIPSD was identified as a novel MLL fusion partner in therapy-related leukemia with t(3;11)(p21;q23). The AF3p21 protein (722 aa) contains an SH3 domain, proline-rich domain, and bipartite nuclear localization signal (NLS). In the MLL-AF3p21 fusion, exon 6 of MLL fuses to exon 2 of AF3p21, producing a chimeric protein with MLL AT-hooks and AF3p21 proline-rich domain and NLS but lacking the AF3p21 SH3 domain.\",\n      \"method\": \"Genomic DNA library screening, RNA analysis, sequencing of fusion junction\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct cloning and sequencing from patient leukemic cells, single study\",\n      \"pmids\": [\"10648423\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"AF3p21/NCKIPSD has a homo-oligomerization domain demonstrated by mammalian two-hybrid system, making it structurally analogous to MLL fusion partners AF10 and AF17.\",\n      \"method\": \"Mammalian two-hybrid system\",\n      \"journal\": \"Leukemia & lymphoma\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single method (two-hybrid), single lab, no orthogonal validation\",\n      \"pmids\": [\"11697487\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"SPIN90/NCKIPSD phosphorylation is regulated by ERK1 (activated by cell adhesion and PDGF) and modulates interaction with Nck. SPIN90 binds betaPIX, WASP, and ERK1 as identified by in vitro binding and yeast two-hybrid. The betaPIX.WASP.SPIN90 complex interacts with Nck in a cell adhesion-dependent manner (abolished in suspended or cytochalasin D-treated cells, restored on fibronectin); SPIN90 phosphorylation by ERK promotes this complex–Nck interaction.\",\n      \"method\": \"Yeast two-hybrid, in vitro binding assays, co-immunoprecipitation, cell adhesion manipulation, ERK kinase assay, overexpression of SH3/PRD domain constructs\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (yeast two-hybrid, in vitro binding, co-IP, kinase assay, domain overexpression with phenotype) in single rigorous study\",\n      \"pmids\": [\"14559906\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"SPIN90/NCKIPSD redistributes to the cell cortex and promotes lamellipodia/membrane ruffle formation in response to PDGF in COS-7 cells; knockdown abolishes this redistribution. The C-terminus of SPIN90 binds both the Arp2/3 complex and G-actin in vitro, and this binding activates Arp2/3 to drive actin polymerization. When coexpressed with PI4P5-kinase, SPIN90 localizes to actin comet tails.\",\n      \"method\": \"siRNA knockdown, PDGF stimulation assay, in vitro Arp2/3 activation assay (C-terminal domain binding), actin comet tail coexpression assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 / Strong — in vitro Arp2/3 activation reconstitution plus knockdown cellular phenotype plus actin comet tail assay\",\n      \"pmids\": [\"16253999\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"SPIN90/NCKIPSD binds dynamin I in presynaptic compartments through SH3-PRD interaction (pull-down and co-immunoprecipitation), and participates in synaptic vesicle endocytosis. Both overexpression and siRNA knockdown of SPIN90 impaired synaptic vesicle endocytosis, and endocytic defects from overexpression were rescued by abolishing SPIN90–dynamin I interaction. Exocytosis kinetics were unaffected.\",\n      \"method\": \"Pull-down, co-immunoprecipitation, siRNA knockdown, overexpression, FM dye-based synaptic vesicle endocytosis assay, rescue experiments\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP plus functional endocytosis assay with knockdown, overexpression, and rescue experiments\",\n      \"pmids\": [\"16221862\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"SPIN90/NCKIPSD binds the SH3 domain of syndapin via its proline-rich domain (in vitro and in vivo) and also associates with clathrin. Overexpression of SPIN90 or its PRD domain (syndapin-binding domain) inhibited transferrin uptake (clathrin-mediated endocytosis), and this inhibition was reversed by co-expression of syndapin. SPIN90 knockdown (antibody microinjection or siRNA) also inhibited transferrin internalization. SPIN90 co-localizes with EEA1/Rab5 early endosomes and travels with moving vesicles in live cells.\",\n      \"method\": \"Yeast two-hybrid, in vitro pull-down, co-immunoprecipitation, transferrin uptake assay, siRNA knockdown, antibody microinjection, live-cell time-lapse imaging\",\n      \"journal\": \"Genes to cells\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (binding assay, co-IP, functional endocytosis assay with knockdown and rescue, live imaging) in single study\",\n      \"pmids\": [\"16999739\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"SPIN90/NCKIPSD localizes to dendritic spines where it associates with PSD-95. Overexpression increased dendritic filopodia/spine number and length via an N-WASP-independent mechanism; siRNA knockdown reduced spine density. PSD-95-induced spinogenesis was abolished by SPIN90 knockdown. In response to chemically induced LTP, SPIN90 redistributed to dendritic spines in association with PSD-95.\",\n      \"method\": \"Co-immunoprecipitation (SPIN90 with PSD-95), siRNA knockdown, overexpression, chemical LTP induction, immunofluorescence localization in neurons\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP, siRNA knockdown with spine phenotype, overexpression, LTP-induced redistribution, multiple orthogonal methods\",\n      \"pmids\": [\"16990791\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"The SH3 domains of SPIN90/NCKIPSD and Src directly bind palladin's poly-proline sequence (in vitro). SPIN90–palladin interaction controls intracellular targeting of SPIN90. Palladin and SPIN90 co-localize in PDGF-induced membrane ruffles/lamellipodia. Knockdown of SPIN90 did not inhibit Src-induced cytoskeletal rearrangement, whereas palladin knockdown caused cytoskeletal disorganization and inhibited remodeling. Palladin is tyrosine phosphorylated by active Src.\",\n      \"method\": \"In vitro binding (direct SH3-polyproline), co-immunoprecipitation, siRNA knockdown, active Src overexpression, immunofluorescence colocalization\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct in vitro binding, co-IP, siRNA knockdown with cytoskeletal phenotype, multiple methods in one study\",\n      \"pmids\": [\"17537434\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"SPIN90/NCKIPSD is a novel binding partner for Shank proteins in the PSD (co-immunoprecipitation from brain lysates). SPIN90 and Shank co-localize in postsynaptic dendrites and synergistically mediate spine maturation and spine head enlargement. SPIN90 overexpression causes accumulation of Shank and PSD-95 in dendritic spines. In SPIN90 knockout mice, PSD protein composition is altered and actin cytoskeleton in hippocampal neurons is abnormal.\",\n      \"method\": \"Co-immunoprecipitation from brain lysates, overexpression, SPIN90 knockout mice, immunofluorescence\",\n      \"journal\": \"Journal of neurochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — co-IP from brain, knockout mouse phenotype, overexpression, multiple orthogonal methods\",\n      \"pmids\": [\"19302483\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"SPIN90/NCKIPSD forms a complex with IRSp53 mediated through direct association of SPIN90's PRD with the SH3 domain of IRSp53 (in vivo co-immunoprecipitation). SPIN90 and IRSp53 cooperate to mediate Rac activation, co-localizing at leading edges in PDGF-treated cells. SPIN90 siRNA knockdown reduced lamellipodia and IRSp53 localization at protrusions. Competitive inhibition of SPIN90–IRSp53 binding via SPIN90 PRD dramatically reduced ruffle formation.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, domain competitive inhibition, immunofluorescence colocalization, PDGF stimulation\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo co-IP, siRNA knockdown with membrane ruffle phenotype, domain competition, multiple methods\",\n      \"pmids\": [\"19460367\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"In DIP/WISH (NCKIPSD)-deficient mouse embryonic fibroblasts, Rho activity is constitutively elevated, cell motility and adhesion are impaired, and cells display many stress fibers due to clustering of pre-existing actin filaments. DIP/WISH thus functions as a negative regulator of Rho and modulates cell adhesion by controlling integration of adhesion molecules.\",\n      \"method\": \"Knockout mouse-derived MEFs, Rho activity assay, cell motility assay, immunofluorescence for stress fibers/adhesion\",\n      \"journal\": \"Genes to cells\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — knockout-derived cells with defined molecular phenotype (Rho activity) and cellular readouts\",\n      \"pmids\": [\"19778379\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"SPIN90/NCKIPSD is enriched in growth cones and neuronal shafts in young hippocampal neurons, with localization dependent on F-actin. SPIN90 knockout reduces growth cone area, filopodial number, total neurite length, and Cdc42 activity compared to wild-type neurons.\",\n      \"method\": \"SPIN90 knockout neurons, immunocytochemistry, F-actin co-localization, growth cone morphometry, Cdc42 activity assay\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — knockout neurons with multiple quantitative readouts (growth cone area, filopodia, neurite length, Cdc42 activity)\",\n      \"pmids\": [\"21763308\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"SPIN90/NCKIPSD is tyrosine phosphorylated by Src kinase (in vitro and in vivo kinase assays). Phospho-SPIN90 is targeted to dendritic spines in hippocampal neurons. A phospho-deficient mutant fails to accumulate at spines or bind PSD-95/Shank efficiently; phospho-mimicking mutant localizes to spines and binds PSD-95/Shank with increased efficiency. Neurons overexpressing SPIN90 WT or phospho-mimicking mutant display enlarged spine heads and enhanced postsynaptic function (increased EPSC amplitude and frequency).\",\n      \"method\": \"In vitro kinase assay, in vivo kinase assay, phospho-deficient/mimetic mutants, immunofluorescence localization, electrophysiology (EPSC recording)\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 / Strong — in vitro and in vivo kinase assay, mutagenesis, electrophysiological functional readout\",\n      \"pmids\": [\"23342115\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"SPIN90/NCKIPSD knockdown attenuates EGFR endocytosis: knockdown cells have higher surface EGFR, fewer EGFR-containing endosomes, smaller endosome size, and delayed early endosomal targeting. Domain overexpression (SH3, PRD, CC domains) causes aberrant Rab5-positive endosome morphology and defective endosomal movement. SPIN90 knockdown-enhanced EGFR stability leads to elevated ERK1/2 activation and increased cyclin D1-dependent cell proliferation.\",\n      \"method\": \"Stable siRNA knockdown, electron microscopy of EGFR distribution, fluorescent confocal microscopy of endosomes, surface EGFR quantification, domain overexpression, cell proliferation assay, ERK1/2 activation assay\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — stable knockdown with multiple orthogonal readouts (EM, confocal, biochemistry, proliferation) plus domain dissection\",\n      \"pmids\": [\"24340049\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"SPIN90/NCKIPSD is dephosphorylated by STEP61 (striatal-enriched protein tyrosine phosphatase) upon NMDA stimulation and translocates from dendritic spines to dendritic shafts. Phosphorylated SPIN90 binds cofilin and inhibits its actin-severing activity; dephosphorylation releases cofilin for actin depolymerization. A phosphomimetic mutant (SPIN90 YE) remained in spines after NMDAR activation, bound cofilin, and prevented actin depolymerization, cortactin/drebrin redistribution, and spine shrinkage.\",\n      \"method\": \"NMDA stimulation of neurons, phosphatase identification (STEP61), co-immunoprecipitation of phospho-SPIN90 with cofilin, phosphomimetic/phospho-deficient mutants, immunofluorescence of spine morphology, cortactin/drebrin redistribution assays\",\n      \"journal\": \"Cellular and molecular life sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — identified writer (STEP61), substrate interaction (cofilin), functional mutant analysis, multiple orthogonal cellular readouts\",\n      \"pmids\": [\"23765104\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"SPIN90/NCKIPSD depletion in stromal fibroblasts facilitates recruitment of mDia2 and APC complex to microtubules, resulting in increased microtubule acetylation. This promotes nuclear localization of YAP, which upregulates myofibroblast marker gene expression on soft matrices, driving cancer-associated fibroblast (CAF) activation. In vivo, Spin90 deficiency enhanced tumor progression, and blockade of microtubule acetylation in CAF inhibited tumor growth in mice.\",\n      \"method\": \"Spin90 knockout mouse-derived fibroblasts, microtubule acetylation assay, mDia2/APC co-immunoprecipitation/recruitment assay, YAP nuclear localization by imaging, myofibroblast marker qPCR, orthotopic breast cancer mouse model\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — knockout MEFs with defined molecular pathway (mDia2/APC→microtubule acetylation→YAP) plus in vivo tumor model validation\",\n      \"pmids\": [\"28652253\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"SPIN90/NCKIPSD acts as an adaptor that facilitates Rab5 activation during EGF-mediated endocytosis. SPIN90 binds inactive Rab5/GDI2 complex through its C-terminus. ERK-mediated phosphorylation of SPIN90 at Thr-242 in response to EGF signaling enables SPIN90 to bind the GEF Gapex5 through its N-terminal SH3 domain, mediating Gapex5–Rab5 proximity and Rab5 activation on endosomal membranes.\",\n      \"method\": \"Co-immunoprecipitation, phosphorylation-site mutation (Thr-242), domain mapping, EGF stimulation, Rab5 activation assay, endosomal localization\",\n      \"journal\": \"Experimental & molecular medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — phospho-site identified, domain-specific interactions mapped by co-IP, functional Rab5 activation assay with mutation rescue\",\n      \"pmids\": [\"31358736\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"In Spin90-knockout MEFs, extra domain A-containing fibronectin (FN+EDA) is upregulated, promotes fibril formation in ECM, and specifically interacts with integrin α4β1. FN+EDA from Spin90-KO MEFs increases breast cancer cell proliferation, migration, and invasion. Irigenin, which blocks integrin α4β1–FN+EDA interaction, inhibited fibril formation by KO MEFs and reduced tumor growth and lung metastases in orthotopic mouse models.\",\n      \"method\": \"Spin90-knockout MEFs, FN+EDA Western blot/IF, integrin co-immunoprecipitation, breast cancer cell co-culture proliferation/migration/invasion assays, orthotopic mouse model, pharmacological inhibition with irigenin\",\n      \"journal\": \"Journal of cellular physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — knockout model, identified mediating receptor (integrin α4β1), pharmacological rescue, in vivo validation\",\n      \"pmids\": [\"31637720\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"In vitro, SPIN90/NCKIPSD promotes formation of unbranched actin filaments by Arp2/3. In cells, SPIN90 favors a formin-dominated cortex. Two mechanisms account for this: (1) efficient recruitment of mDia1 to SPIN90-Arp2/3 nucleated filaments, and (2) formation of a ternary SPIN90-Arp2/3-mDia1 complex that greatly enhances filament nucleation. Both mechanisms yield rapidly elongating filaments with mDia1 at barbed ends and SPIN90-Arp2/3 at pointed ends. In networks, SPIN90 lowers branching density and increases the proportion of long mDia1-elongated filaments.\",\n      \"method\": \"In vitro actin polymerization reconstitution, TIRF microscopy of single filaments, ternary complex formation assay, cell cortex analysis\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with single-molecule TIRF, ternary complex characterization, mechanistic dissection of two distinct pathways\",\n      \"pmids\": [\"32572169\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"miR-130b-3p directly downregulates SPIN90/NCKIPSD in stromal fibroblasts. Ectopic expression of miR-130b-3p in fibroblasts accelerated their differentiation to CAFs and promoted cancer cell motility, associated with SPIN90 downregulation. miR-130b-3p is generated in luminal A-type cancer cells and delivered to fibroblasts via exosomes.\",\n      \"method\": \"miRNA target validation (ectopic expression, luciferase reporter implied), fibroblast differentiation assay, exosome delivery assay, cancer cell motility assay, patient tissue correlation\",\n      \"journal\": \"Oncogenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — functional miRNA-mediated SPIN90 downregulation with CAF differentiation readout, exosome mechanism, but abstract does not detail direct 3'UTR luciferase validation\",\n      \"pmids\": [\"35948548\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"NCKIPSD (SPIN90/WISH) is an SH3 domain-containing adaptor protein that regulates actin cytoskeletal dynamics by activating the Arp2/3 complex directly (via its C-terminus binding G-actin and Arp2/3) and through N-WASP in a Cdc42-independent manner; it recruits mDia1 to form a ternary SPIN90-Arp2/3-mDia1 complex that nucleates long, rapidly elongating actin filaments, thereby shifting cortical networks toward formin-dominated architectures. SPIN90 scaffolds multiple protein complexes—including Nck, betaPIX, WASP, IRSp53, syndapin, dynamin I, PSD-95, and Shank—to coordinate lamellipodia formation, clathrin-mediated endocytosis (including EGFR endocytosis via Rab5/Gapex5 activation), and synaptic vesicle recycling. In neurons, SPIN90's Src kinase-dependent tyrosine phosphorylation targets it to dendritic spines to promote spinogenesis and synaptic potentiation, while NMDA-induced dephosphorylation by STEP61 releases cofilin to drive actin depolymerization and spine shrinkage; in fibroblasts, SPIN90 loss elevates Rho activity, impairs motility, and triggers microtubule acetylation-dependent YAP nuclear translocation that drives cancer-associated fibroblast activation.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"NCKIPSD (SPIN90/WISH/DIP) is an SH3- and proline-rich-domain adaptor that organizes actin cytoskeletal dynamics by directly engaging the Arp2/3 complex and scaffolding multiple actin regulators [#0, #5, #20]. It enhances N-WASP-induced Arp2/3 activation in a Cdc42-independent manner, and its own C-terminus binds both G-actin and the Arp2/3 complex to drive actin polymerization [#0, #5]. Beyond promoting branched nucleation, NCKIPSD recruits the formin mDia1 to Arp2/3-nucleated filaments and forms a ternary SPIN90-Arp2/3-mDia1 complex that nucleates long, rapidly elongating unbranched filaments, biasing cortical networks toward a formin-dominated architecture [#20]. Through its SH3 domain and proline-rich region it links Nck, betaPIX/WASP/ERK1, IRSp53, syndapin, and dynamin I into adhesion- and growth-factor-responsive complexes that build lamellipodia and membrane ruffles and execute clathrin-mediated and EGFR endocytosis [#1, #4, #11, #6, #7, #15]; in the endocytic pathway, ERK-dependent phosphorylation at Thr-242 enables NCKIPSD to bridge the GEF Gapex5 to inactive Rab5/GDI2 and activate Rab5 on endosomes [#18]. In neurons, NCKIPSD associates with PSD-95 and Shank at dendritic spines to promote spinogenesis and spine maturation, with Src-dependent tyrosine phosphorylation targeting it to spines and enhancing postsynaptic function, while NMDA-induced dephosphorylation by STEP61 releases cofilin to drive actin depolymerization and spine shrinkage [#8, #10, #14, #16]. In fibroblasts, loss of NCKIPSD elevates Rho activity and impairs motility, and drives microtubule acetylation-dependent YAP nuclear translocation and ECM remodeling that activate cancer-associated fibroblasts [#12, #17, #19]. NCKIPSD was originally identified as the AF3p21 MLL fusion partner in therapy-related leukemia bearing t(3;11)(p21;q23) [#2].\",\n  \"teleology\": [\n    {\n      \"year\": 2000,\n      \"claim\": \"Established NCKIPSD as a gene of clinical relevance by identifying it as a novel MLL fusion partner, defining its domain architecture (SH3, proline-rich domain, NLS) before any cytoskeletal function was known.\",\n      \"evidence\": \"Genomic cloning and fusion-junction sequencing from therapy-related leukemia cells with t(3;11)(p21;q23)\",\n      \"pmids\": [\"10648423\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Does not establish a functional role for the fusion protein\", \"Loss of the SH3 domain in the fusion leaves the chimera's mechanism undefined\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Defined the core biochemical activity of NCKIPSD: it binds N-WASP via its SH3 domain and strongly potentiates N-WASP/Arp2/3-driven actin polymerization independent of Cdc42, establishing it as an actin nucleation regulator.\",\n      \"evidence\": \"In vitro Arp2/3 polymerization assays, co-IP, N-WASP-depleted brain extract rescue, and N-WASP mutant (H208D) cell assays\",\n      \"pmids\": [\"11157975\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve the N-WASP-independent route to Arp2/3 activation at the molecular level\", \"Physiological trigger for the activity in cells not defined\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Identified NCKIPSD as an Nck-binding adaptor localizing to sarcomere Z-discs, framing it as a structural scaffold whose perturbation disrupts cytoskeletal organization.\",\n      \"evidence\": \"Yeast two-hybrid, in vitro SH3-binding assays, immunofluorescence, and antibody microinjection in cardiac myocytes\",\n      \"pmids\": [\"11278500\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism linking Nck binding to Z-disc maintenance not established\", \"Cardiac function relevance untested\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Connected NCKIPSD scaffolding to signaling by showing ERK1 phosphorylation regulates assembly of a betaPIX/WASP/SPIN90 complex with Nck in an adhesion-dependent manner.\",\n      \"evidence\": \"Yeast two-hybrid, in vitro binding, co-IP, ERK kinase assays, and adhesion manipulation\",\n      \"pmids\": [\"14559906\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific ERK phospho-sites not mapped in this study\", \"Downstream actin output of the complex not quantified\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Demonstrated NCKIPSD's direct, autonomous Arp2/3 activity (C-terminus binds G-actin and Arp2/3) and tied it to growth-factor-induced cortical actin remodeling.\",\n      \"evidence\": \"siRNA knockdown, PDGF stimulation, in vitro Arp2/3 activation with C-terminal domain, actin comet tail coexpression\",\n      \"pmids\": [\"16253999\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative contribution of direct versus N-WASP-mediated Arp2/3 activation in cells unresolved\", \"Structural basis of C-terminal Arp2/3/G-actin binding unknown\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Extended NCKIPSD function to membrane trafficking by showing it binds dynamin I and is required for synaptic vesicle endocytosis.\",\n      \"evidence\": \"Pull-down, reciprocal co-IP, knockdown/overexpression, FM-dye endocytosis assays and interaction-disruption rescue\",\n      \"pmids\": [\"16221862\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether actin nucleation activity is required for the endocytic role not separated\", \"Coupling to the dynamin fission step mechanistically undefined\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Generalized the endocytic role to clathrin-mediated endocytosis via syndapin and clathrin binding, and placed NCKIPSD on Rab5/EEA1 early endosomes.\",\n      \"evidence\": \"Yeast two-hybrid, pull-down, co-IP, transferrin uptake with rescue, knockdown, and live-cell imaging\",\n      \"pmids\": [\"16999739\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How NCKIPSD switches between dynamin and syndapin partners not defined\", \"Vesicle-stage specificity of its action unclear\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Established a neuronal structural role: NCKIPSD associates with PSD-95 and drives spinogenesis through an N-WASP-independent mechanism.\",\n      \"evidence\": \"Reciprocal co-IP, siRNA knockdown, overexpression spine morphometry, and chemical LTP-induced redistribution\",\n      \"pmids\": [\"16990791\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular identity of the N-WASP-independent actin pathway in spines not specified\", \"Direct PSD-95 binding interface not mapped\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Identified palladin as a determinant of NCKIPSD intracellular targeting, distinguishing NCKIPSD-dependent from Src/palladin-dependent cytoskeletal remodeling.\",\n      \"evidence\": \"Direct in vitro SH3-polyproline binding, co-IP, knockdown, and active-Src overexpression with colocalization\",\n      \"pmids\": [\"17537434\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of palladin-directed targeting on actin output not quantified\", \"Hierarchy of palladin versus other targeting cues unknown\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Defined cooperative cytoskeletal and synaptic modules: NCKIPSD partners IRSp53 to drive Rac-dependent lamellipodia, and Shank to mediate spine maturation, with knockout altering PSD composition.\",\n      \"evidence\": \"Co-IP, siRNA knockdown, domain competition, knockout mice, and immunofluorescence across two studies\",\n      \"pmids\": [\"19460367\", \"19302483\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether IRSp53 and Shank modules are spatially distinct pools not addressed\", \"Mechanism of Rac activation downstream of IRSp53 binding unresolved\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Revealed NCKIPSD as a negative regulator of Rho controlling adhesion and motility, using knockout fibroblasts.\",\n      \"evidence\": \"Knockout MEFs with Rho activity assays, motility and adhesion readouts, stress-fiber imaging\",\n      \"pmids\": [\"19778379\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism by which NCKIPSD suppresses Rho not defined\", \"Link between Rho regulation and Arp2/3 nucleation function unclear\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Showed NCKIPSD supports neuronal growth-cone morphogenesis and Cdc42 activity, linking it to early neurite development.\",\n      \"evidence\": \"Knockout neurons, F-actin colocalization, growth-cone morphometry, Cdc42 activity assay\",\n      \"pmids\": [\"21763308\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How NCKIPSD promotes Cdc42 activity mechanistically unknown\", \"Relationship to its Cdc42-independent Arp2/3 activity not reconciled\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Established Src-dependent tyrosine phosphorylation as the switch that targets NCKIPSD to spines and enhances synaptic function.\",\n      \"evidence\": \"In vitro/in vivo kinase assays, phospho-deficient/mimetic mutants, localization, and EPSC electrophysiology\",\n      \"pmids\": [\"23342115\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Phospho-site(s) governing PSD-95/Shank binding not fully resolved\", \"Upstream signals activating Src toward NCKIPSD undefined\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Defined the reverse switch and a direct actin-depolymerization mechanism: STEP61 dephosphorylates NCKIPSD upon NMDA stimulation, releasing bound cofilin to drive spine shrinkage.\",\n      \"evidence\": \"NMDA stimulation, STEP61 identification, phospho-SPIN90/cofilin co-IP, phosphomimetic mutants, spine and cortactin/drebrin imaging\",\n      \"pmids\": [\"23765104\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of phospho-dependent cofilin sequestration not determined\", \"How this integrates with NCKIPSD's Arp2/3-nucleating role in the same spine unclear\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Connected NCKIPSD to receptor signaling output by showing it promotes EGFR endocytosis, with its loss stabilizing surface EGFR, elevating ERK1/2 and driving proliferation.\",\n      \"evidence\": \"Stable knockdown with EM, confocal endosome analysis, surface EGFR quantification, domain dissection, and proliferation assays\",\n      \"pmids\": [\"24340049\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Step at which NCKIPSD acts in EGFR endosomal maturation not pinpointed here\", \"Generality across other receptor cargoes untested\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Defined a tumor-microenvironment mechanism: NCKIPSD loss in fibroblasts recruits mDia2/APC to microtubules, raising microtubule acetylation and YAP nuclear translocation to drive CAF activation and tumor progression.\",\n      \"evidence\": \"Knockout MEFs, microtubule acetylation and recruitment assays, YAP imaging, marker qPCR, orthotopic breast cancer model\",\n      \"pmids\": [\"28652253\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How NCKIPSD normally restrains mDia2/APC microtubule recruitment unknown\", \"Direct molecular link between acetylation and YAP nuclear entry not resolved\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Resolved the molecular logic of NCKIPSD-driven Rab5 activation: ERK phosphorylation at Thr-242 lets NCKIPSD bridge Gapex5 (SH3) to inactive Rab5/GDI2 (C-terminus) on endosomes.\",\n      \"evidence\": \"Co-IP, Thr-242 mutation, domain mapping, EGF stimulation, and Rab5 activation assays\",\n      \"pmids\": [\"31358736\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether the same phospho-event coordinates other endocytic partners unaddressed\", \"Kinetic ordering relative to dynamin/syndapin steps unknown\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Showed NCKIPSD loss remodels the ECM, upregulating FN+EDA that signals through integrin alpha4beta1 to enhance breast cancer aggressiveness, a druggable axis.\",\n      \"evidence\": \"Knockout MEFs, FN+EDA Western/IF, integrin co-IP, co-culture invasion assays, orthotopic model, irigenin inhibition\",\n      \"pmids\": [\"31637720\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which NCKIPSD restrains FN+EDA expression not defined\", \"Cytoskeletal versus transcriptional contribution to ECM phenotype unseparated\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Reconceived NCKIPSD's actin function: rather than only promoting branching, it nucleates unbranched filaments via Arp2/3 and forms a ternary SPIN90-Arp2/3-mDia1 complex that produces long formin-elongated filaments, shifting cortex architecture.\",\n      \"evidence\": \"In vitro reconstitution, single-molecule TIRF microscopy, ternary complex assays, and cell cortex network analysis\",\n      \"pmids\": [\"32572169\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How this ternary-complex pathway is regulated by the upstream signaling/phospho-switches not connected\", \"Relative in vivo prevalence versus N-WASP-branched nucleation unresolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Identified an upstream regulatory layer: cancer-cell-derived exosomal miR-130b-3p downregulates NCKIPSD in fibroblasts to drive CAF differentiation.\",\n      \"evidence\": \"miR-130b-3p ectopic expression, exosome delivery, fibroblast differentiation and cancer motility assays, patient tissue correlation\",\n      \"pmids\": [\"35948548\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct 3'UTR binding not detailed in this evidence\", \"Whether miRNA-driven NCKIPSD loss recapitulates the full mDia2/YAP and FN+EDA phenotypes untested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How NCKIPSD's signal-driven phospho-switches integrate its competing actin-nucleating, formin-recruiting, and cofilin-sequestering activities at a single subcellular location remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structural model of the autonomous Arp2/3-activating C-terminus\", \"No unified model reconciling Cdc42-independent Arp2/3 activation with the observed Cdc42 and Rho regulation\", \"Mechanism of the MLL-AF3p21 fusion in leukemogenesis uncharacterized\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [1, 4, 6, 7, 11, 18]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [0, 5, 20]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 5, 12, 16, 20]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [1, 5, 9, 13]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [5, 11]},\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [7, 15, 18]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [4, 6]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [6, 7, 15, 18]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [4, 15, 17, 18]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [8, 10, 14, 16]},\n      {\"term_id\": \"R-HSA-1474244\", \"supporting_discovery_ids\": [19]}\n    ],\n    \"complexes\": [\n      \"SPIN90-Arp2/3-mDia1 ternary complex\",\n      \"betaPIX-WASP-SPIN90-Nck complex\",\n      \"postsynaptic density (PSD-95/Shank)\"\n    ],\n    \"partners\": [\n      \"WASL\",\n      \"NCK1\",\n      \"ARPC\",\n      \"DIAPH1\",\n      \"BAIAP2\",\n      \"DNM1\",\n      \"DLG4\",\n      \"SHANK\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}