{"gene":"NCKAP1","run_date":"2026-06-10T05:19:52","timeline":{"discoveries":[{"year":2016,"finding":"NCKAP1 is a core component of the WASF3 (WAVE) protein complex; silencing NCKAP1 destabilizes the WASF3 complex, prevents RAC1 association with the complex, and suppresses invasion and metastasis of breast, prostate, and colon cancer cells. Stapled peptides targeting the NCKAP1–CYFIP1 interface recapitulate complex destabilization and RAC1 dissociation.","method":"siRNA silencing, co-immunoprecipitation, stapled peptide disruption, in vivo spontaneous metastasis model","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP demonstrating complex membership, RAC1 binding assay, in vitro invasion assays, in vivo metastasis model, and pharmacological disruption as orthogonal validation; replicated across multiple cancer cell lines","pmids":["27432794"],"is_preprint":false},{"year":2000,"finding":"Antisense oligonucleotide knockdown of human NCKAP1 transcripts induces apoptosis in neuronal cells, establishing a pro-survival role for NCKAP1 in neurons.","method":"Antisense oligonucleotide knockdown, cell viability/apoptosis assay","journal":"Genomics","confidence":"Medium","confidence_rationale":"Tier 3 / Weak — single loss-of-function experiment in a single lab with a defined apoptotic phenotype but limited mechanistic follow-up","pmids":["10673335"],"is_preprint":false},{"year":2001,"finding":"NCKAP1 interacts with hNap1BP, a tyrosine kinase-binding protein that also binds the SH3 domains of c-Abl and Nck, placing NCKAP1 within a Nck-mediated signal transduction network.","method":"Yeast two-hybrid screening, binding assays","journal":"Gene","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single yeast two-hybrid screen without reciprocal co-immunoprecipitation or in vitro reconstitution","pmids":["11418237"],"is_preprint":false},{"year":2019,"finding":"In hepatocellular carcinoma (HCC) cells, NCKAP1 overexpression upregulates Rb1 and p53 protein levels and inhibits cell-cycle progression into G2/M phase; WASF1 is barely expressed in HCC lines, explaining why the WAVE/WASF1-invasion axis is not operative in this context.","method":"NCKAP1 overexpression, western blot for Rb1/p53, cell-cycle analysis by flow cytometry, in vivo xenograft model","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (western blot, cell-cycle FACS, in vivo model) in a single lab; mechanistic link to Rb1/p53 pathway established by direct protein measurement","pmids":["31068575"],"is_preprint":false},{"year":2020,"finding":"Mouse in utero electroporation experiments showed that Nckap1 loss-of-function promotes aberrant neuronal migration during early cortical development, demonstrating a direct role for NCKAP1 in neuronal cytoskeletal dynamics and neuronal migration in vivo.","method":"In utero electroporation with Nckap1 loss-of-function constructs, cortical migration assay in mouse","journal":"American journal of human genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo loss-of-function with a defined cellular phenotype (neuronal migration defect); single lab but direct experimental readout","pmids":["33157009"],"is_preprint":false},{"year":2020,"finding":"Targeted deletion of Nckap1 in the melanocyte lineage in a BRAF(V600E);Pten-loss mouse model delayed tumor onset and progression, slowed proliferation, and caused fibrotic stroma with increased collagen deposition and enhanced immune infiltration, demonstrating that NCKAP1-orchestrated actin polymerization (as part of the SCAR/WAVE complex downstream of RAC1) is required for tumor tissue integrity and cell-cycle progression.","method":"Conditional Nckap1 knockout in mouse melanocyte lineage, histopathology, tumor growth measurement, immunohistochemistry for collagen and immune markers","journal":"The Journal of investigative dermatology","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo conditional knockout with multiple orthogonal phenotypic readouts (tumor growth, proliferation, stromal remodeling, immune infiltration) in a defined genetic background","pmids":["32777214"],"is_preprint":false},{"year":2023,"finding":"Decreased NCKAP1 expression in microglia-like cells (iMGs) from rapidly progressive ALS patients is associated with abnormal actin polymerization and defective phagocytosis; NCKAP1 overexpression was sufficient to rescue impaired phagocytosis in these cells, establishing NCKAP1-mediated actin dynamics as necessary for microglial phagocytic function.","method":"Transcriptome analysis of patient-derived iMGs, NCKAP1 overexpression rescue experiment, phagocytosis functional assay","journal":"Molecular neurobiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — rescue experiment with defined functional readout (phagocytosis assay) combined with transcriptomic identification; single lab","pmids":["37154887"],"is_preprint":false},{"year":2025,"finding":"Computational hotspot analysis of autism-linked missense variants in NCKAP1 and CYFIP2 showed that most variants in the WAVE regulatory complex are located at the NCKAP1–CYFIP2 protein interface and predominantly decrease the binding affinity of NCKAP1 for the rest of the WRC, with some variants having the opposite stabilizing effect; results are consistent with experimental data on WRC stability.","method":"Computational hotspot analysis, molecular dynamics/docking of WRC structural models with ASD-linked variants","journal":"Protein science","confidence":"Low","confidence_rationale":"Tier 4 / Weak — purely computational study, no in vitro reconstitution or mutagenesis experiment performed in this paper","pmids":["39660913"],"is_preprint":false},{"year":2026,"finding":"Knockdown of NCKAP1 in endothelial cells disrupts the WAVE regulatory complex, impairs lamellipodia-based protrusions, suppresses paxillin phosphorylation (FAK-paxillin signaling), delays endothelial barrier formation, inhibits actin dynamics at intercellular junctions, and restricts angiogenesis, identifying WRC/NCKAP1 as a direct regulator of focal adhesions and endothelial barrier function.","method":"siRNA knockdown, lamellipodia imaging, phospho-paxillin western blot, endothelial barrier assay, angiogenesis assay","journal":"iScience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal functional assays (morphology, signaling, barrier, angiogenesis) in a single study with defined mechanistic pathway linkage","pmids":["42095096"],"is_preprint":false}],"current_model":"NCKAP1 (NAP125/HEM2) is a core structural subunit of the pentameric WAVE regulatory complex (WRC) that couples RAC1 GTPase signaling to Arp2/3-dependent branched actin polymerization; it maintains WRC integrity by bridging CYFIP1/2 and WASF proteins, enables RAC1 recruitment to the complex, drives lamellipodia formation and cell migration, supports neuronal migration during cortical development, is required for microglial phagocytosis via actin dynamics, and coordinates focal adhesion (FAK-paxillin) and adherens junction remodeling in endothelial cells, while in certain cellular contexts (e.g., hepatocellular carcinoma lacking WASF1) it can alternatively modulate the cell cycle through Rb1/p53 upregulation."},"narrative":{"mechanistic_narrative":"NCKAP1 is a core structural subunit of the WAVE regulatory complex (WRC) that couples RAC1 GTPase signaling to branched actin polymerization, driving cell motility across normal and malignant contexts [PMID:27432794]. It maintains WRC integrity by bridging CYFIP and WASF subunits: silencing NCKAP1 destabilizes the WASF3 complex and prevents RAC1 from associating with it, and stapled peptides targeting the NCKAP1–CYFIP1 interface reproduce this disassembly and RAC1 dissociation, abolishing cancer cell invasion and metastasis [PMID:27432794]. Through WRC-dependent actin dynamics, NCKAP1 supports lamellipodial protrusion and coordinates FAK–paxillin focal adhesion signaling and adherens junction remodeling in endothelial cells, thereby enabling endothelial barrier formation and angiogenesis [PMID:42095096]. The same actin-polymerizing function is required for proper neuronal migration during cortical development [PMID:33157009] and for microglial phagocytosis, where reduced NCKAP1 produces defective actin polymerization that overexpression rescues [PMID:37154887]. In vivo, NCKAP1 loss in a melanoma model delays tumor onset and proliferation while remodeling stroma and immune infiltration, linking WRC-driven actin assembly to tumor tissue integrity [PMID:32777214]. In a hepatocellular carcinoma context lacking WASF1, NCKAP1 overexpression instead upregulates Rb1 and p53 and arrests cell-cycle progression, indicating a context-dependent role outside the canonical invasion axis [PMID:31068575]. Autism-linked missense variants cluster at the NCKAP1–CYFIP2 interface and predominantly weaken NCKAP1 binding to the WRC [PMID:39660913].","teleology":[{"year":2000,"claim":"Established the first functional consequence of losing NCKAP1 in neurons, framing it as a pro-survival factor before any molecular mechanism was known.","evidence":"Antisense oligonucleotide knockdown with apoptosis readout in neuronal cells","pmids":["10673335"],"confidence":"Medium","gaps":["No molecular mechanism linking knockdown to apoptosis","Pro-survival role not connected to actin or WRC function at this stage"]},{"year":2001,"claim":"Placed NCKAP1 within a Nck/c-Abl tyrosine kinase signaling network via a binding partner, an early hint of its role in signal transduction.","evidence":"Yeast two-hybrid screen identifying hNap1BP interaction","pmids":["11418237"],"confidence":"Low","gaps":["Single yeast two-hybrid without reciprocal Co-IP or reconstitution","Functional relevance of the Nck network to actin regulation untested"]},{"year":2016,"claim":"Defined NCKAP1 as a core structural subunit holding the WAVE/WASF3 complex together and enabling RAC1 recruitment, mechanistically explaining its requirement for invasion and metastasis.","evidence":"siRNA silencing, reciprocal Co-IP, RAC1 binding assay, stapled-peptide interface disruption, and in vivo metastasis model across multiple cancer lines","pmids":["27432794"],"confidence":"High","gaps":["Atomic details of the NCKAP1–CYFIP1 interface not resolved here","Whether destabilization is identical across all WASF paralogs not addressed"]},{"year":2019,"claim":"Revealed a non-canonical, WRC-independent role in which NCKAP1 modulates the cell cycle through Rb1/p53 in a cellular context lacking WASF1.","evidence":"NCKAP1 overexpression with Rb1/p53 western blot, cell-cycle FACS, and xenograft model in HCC cells","pmids":["31068575"],"confidence":"Medium","gaps":["Mechanism connecting NCKAP1 to Rb1/p53 upregulation unknown","Whether this is direct or secondary to altered actin signaling unresolved"]},{"year":2020,"claim":"Demonstrated an in vivo developmental requirement for NCKAP1 in neuronal cytoskeletal dynamics and cortical neuronal migration.","evidence":"In utero electroporation with Nckap1 loss-of-function constructs and cortical migration assay in mouse","pmids":["33157009"],"confidence":"Medium","gaps":["WRC dependence of the migration defect not directly tested in this system","Downstream actin effectors in migrating neurons not identified"]},{"year":2020,"claim":"Showed via conditional knockout that NCKAP1-driven actin polymerization is required for tumor tissue integrity, proliferation, and shaping of the stromal/immune microenvironment in vivo.","evidence":"Melanocyte-lineage Nckap1 knockout in a BRAF(V600E);Pten-loss model with tumor growth, proliferation, collagen, and immune-marker readouts","pmids":["32777214"],"confidence":"High","gaps":["Mechanism linking actin assembly to stromal fibrosis and immune infiltration not dissected","Cell-autonomous versus microenvironmental contributions not separated"]},{"year":2023,"claim":"Established that NCKAP1-mediated actin dynamics are necessary for microglial phagocytosis, with overexpression sufficient to rescue the defect in patient-derived cells.","evidence":"Transcriptomic identification in ALS patient iMGs plus NCKAP1 overexpression rescue and phagocytosis assay","pmids":["37154887"],"confidence":"Medium","gaps":["Single-lab study without genetic knockout confirmation","Connection to WRC subunits in microglia not directly shown"]},{"year":2026,"claim":"Extended NCKAP1/WRC function to endothelial biology, linking it directly to FAK–paxillin focal adhesion signaling, junction remodeling, barrier formation, and angiogenesis.","evidence":"siRNA knockdown with lamellipodia imaging, phospho-paxillin western blot, endothelial barrier and angiogenesis assays","pmids":["42095096"],"confidence":"Medium","gaps":["Whether NCKAP1 regulates FAK–paxillin directly or via actin remodeling not separated","Single-study mechanistic pathway not yet independently replicated"]},{"year":null,"claim":"How disease-associated NCKAP1 missense variants quantitatively alter WRC assembly and downstream actin output in vivo remains unresolved.","evidence":"Computational hotspot analysis of ASD-linked variants at the NCKAP1–CYFIP2 interface predicting altered binding affinity","pmids":[],"confidence":"Low","gaps":["Purely computational; no mutagenesis or reconstitution performed","Predicted affinity changes not validated against cellular WRC stability or actin phenotypes"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[0,7]}],"localization":[{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[8]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[8]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[4]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[3,5]}],"complexes":["WAVE regulatory complex (WRC)","WASF3/WAVE complex"],"partners":["CYFIP1","CYFIP2","WASF3","RAC1","WASF1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9Y2A7","full_name":"Nck-associated protein 1","aliases":["Membrane-associated protein HEM-2","p125Nap1"],"length_aa":1128,"mass_kda":128.8,"function":"Part of the WAVE complex that regulates lamellipodia formation. The WAVE complex regulates actin filament reorganization via its interaction with the Arp2/3 complex. Actin remodeling activity is regulated by RAC1. As component of the WAVE1 complex, required for BDNF-NTRK2 endocytic trafficking and signaling from early endosomes","subcellular_location":"Cell membrane; Cell projection, lamellipodium membrane","url":"https://www.uniprot.org/uniprotkb/Q9Y2A7/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/NCKAP1","classification":"Not Classified","n_dependent_lines":592,"n_total_lines":1208,"dependency_fraction":0.4900662251655629},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000061676","cell_line_id":"CID000537","localizations":[{"compartment":"cytoplasmic","grade":3},{"compartment":"membrane","grade":3},{"compartment":"cell_contact","grade":2}],"interactors":[{"gene":"CYFIP1","stoichiometry":10.0},{"gene":"KIAA1522","stoichiometry":10.0},{"gene":"WASF2","stoichiometry":10.0},{"gene":"WASF3","stoichiometry":10.0},{"gene":"BRK1","stoichiometry":10.0},{"gene":"WASF1","stoichiometry":10.0},{"gene":"CYFIP2","stoichiometry":10.0},{"gene":"ENAH","stoichiometry":10.0},{"gene":"ABI1","stoichiometry":10.0},{"gene":"BAIAP2","stoichiometry":4.0}],"url":"https://opencell.sf.czbiohub.org/target/CID000537","total_profiled":1310},"omim":[{"mim_id":"606322","title":"CYTOPLASMIC FMRP-INTERACTING PROTEIN 1; CYFIP1","url":"https://www.omim.org/entry/606322"},{"mim_id":"604891","title":"NCK-ASSOCIATED PROTEIN 1; NCKAP1","url":"https://www.omim.org/entry/604891"},{"mim_id":"602048","title":"RAS-RELATED C3 BOTULINUM TOXIN SUBSTRATE 1; RAC1","url":"https://www.omim.org/entry/602048"},{"mim_id":"141180","title":"NCK-ASSOCIATED PROTEIN 1-LIKE; NCKAP1L","url":"https://www.omim.org/entry/141180"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Cytosol","reliability":"Approved"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/NCKAP1"},"hgnc":{"alias_symbol":["Nap1","HEM2","NAP125"],"prev_symbol":[]},"alphafold":{"accession":"Q9Y2A7","domains":[{"cath_id":"-","chopping":"1-187","consensus_level":"medium","plddt":90.7887,"start":1,"end":187},{"cath_id":"-","chopping":"585-631_673-799","consensus_level":"medium","plddt":95.3006,"start":585,"end":799},{"cath_id":"-","chopping":"800-1126","consensus_level":"medium","plddt":91.4885,"start":800,"end":1126},{"cath_id":"1.20.1480","chopping":"424-529","consensus_level":"high","plddt":94.9568,"start":424,"end":529}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9Y2A7","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9Y2A7-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9Y2A7-F1-predicted_aligned_error_v6.png","plddt_mean":92.62},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=NCKAP1","jax_strain_url":"https://www.jax.org/strain/search?query=NCKAP1"},"sequence":{"accession":"Q9Y2A7","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9Y2A7.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9Y2A7/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9Y2A7"}},"corpus_meta":[{"pmid":"2445751","id":"PMC_2445751","title":"Characterization of the yeast HEM2 gene and transcriptional regulation of COX5 and COR1 by heme.","date":"1987","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/2445751","citation_count":66,"is_preprint":false},{"pmid":"27432794","id":"PMC_27432794","title":"The WASF3-NCKAP1-CYFIP1 Complex Is Essential for Breast Cancer Metastasis.","date":"2016","source":"Cancer research","url":"https://pubmed.ncbi.nlm.nih.gov/27432794","citation_count":66,"is_preprint":false},{"pmid":"10673335","id":"PMC_10673335","title":"Molecular cloning of a novel apoptosis-related gene, human Nap1 (NCKAP1), and its possible relation to Alzheimer disease.","date":"2000","source":"Genomics","url":"https://pubmed.ncbi.nlm.nih.gov/10673335","citation_count":50,"is_preprint":false},{"pmid":"11418237","id":"PMC_11418237","title":"Isolation of hNap1BP which interacts with human Nap1 (NCKAP1) whose expression is down-regulated in Alzheimer's 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Stapled peptides targeting the NCKAP1–CYFIP1 interface recapitulate complex destabilization and RAC1 dissociation.\",\n      \"method\": \"siRNA silencing, co-immunoprecipitation, stapled peptide disruption, in vivo spontaneous metastasis model\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP demonstrating complex membership, RAC1 binding assay, in vitro invasion assays, in vivo metastasis model, and pharmacological disruption as orthogonal validation; replicated across multiple cancer cell lines\",\n      \"pmids\": [\"27432794\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Antisense oligonucleotide knockdown of human NCKAP1 transcripts induces apoptosis in neuronal cells, establishing a pro-survival role for NCKAP1 in neurons.\",\n      \"method\": \"Antisense oligonucleotide knockdown, cell viability/apoptosis assay\",\n      \"journal\": \"Genomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single loss-of-function experiment in a single lab with a defined apoptotic phenotype but limited mechanistic follow-up\",\n      \"pmids\": [\"10673335\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"NCKAP1 interacts with hNap1BP, a tyrosine kinase-binding protein that also binds the SH3 domains of c-Abl and Nck, placing NCKAP1 within a Nck-mediated signal transduction network.\",\n      \"method\": \"Yeast two-hybrid screening, binding assays\",\n      \"journal\": \"Gene\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single yeast two-hybrid screen without reciprocal co-immunoprecipitation or in vitro reconstitution\",\n      \"pmids\": [\"11418237\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"In hepatocellular carcinoma (HCC) cells, NCKAP1 overexpression upregulates Rb1 and p53 protein levels and inhibits cell-cycle progression into G2/M phase; WASF1 is barely expressed in HCC lines, explaining why the WAVE/WASF1-invasion axis is not operative in this context.\",\n      \"method\": \"NCKAP1 overexpression, western blot for Rb1/p53, cell-cycle analysis by flow cytometry, in vivo xenograft model\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (western blot, cell-cycle FACS, in vivo model) in a single lab; mechanistic link to Rb1/p53 pathway established by direct protein measurement\",\n      \"pmids\": [\"31068575\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Mouse in utero electroporation experiments showed that Nckap1 loss-of-function promotes aberrant neuronal migration during early cortical development, demonstrating a direct role for NCKAP1 in neuronal cytoskeletal dynamics and neuronal migration in vivo.\",\n      \"method\": \"In utero electroporation with Nckap1 loss-of-function constructs, cortical migration assay in mouse\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo loss-of-function with a defined cellular phenotype (neuronal migration defect); single lab but direct experimental readout\",\n      \"pmids\": [\"33157009\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Targeted deletion of Nckap1 in the melanocyte lineage in a BRAF(V600E);Pten-loss mouse model delayed tumor onset and progression, slowed proliferation, and caused fibrotic stroma with increased collagen deposition and enhanced immune infiltration, demonstrating that NCKAP1-orchestrated actin polymerization (as part of the SCAR/WAVE complex downstream of RAC1) is required for tumor tissue integrity and cell-cycle progression.\",\n      \"method\": \"Conditional Nckap1 knockout in mouse melanocyte lineage, histopathology, tumor growth measurement, immunohistochemistry for collagen and immune markers\",\n      \"journal\": \"The Journal of investigative dermatology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo conditional knockout with multiple orthogonal phenotypic readouts (tumor growth, proliferation, stromal remodeling, immune infiltration) in a defined genetic background\",\n      \"pmids\": [\"32777214\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Decreased NCKAP1 expression in microglia-like cells (iMGs) from rapidly progressive ALS patients is associated with abnormal actin polymerization and defective phagocytosis; NCKAP1 overexpression was sufficient to rescue impaired phagocytosis in these cells, establishing NCKAP1-mediated actin dynamics as necessary for microglial phagocytic function.\",\n      \"method\": \"Transcriptome analysis of patient-derived iMGs, NCKAP1 overexpression rescue experiment, phagocytosis functional assay\",\n      \"journal\": \"Molecular neurobiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — rescue experiment with defined functional readout (phagocytosis assay) combined with transcriptomic identification; single lab\",\n      \"pmids\": [\"37154887\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Computational hotspot analysis of autism-linked missense variants in NCKAP1 and CYFIP2 showed that most variants in the WAVE regulatory complex are located at the NCKAP1–CYFIP2 protein interface and predominantly decrease the binding affinity of NCKAP1 for the rest of the WRC, with some variants having the opposite stabilizing effect; results are consistent with experimental data on WRC stability.\",\n      \"method\": \"Computational hotspot analysis, molecular dynamics/docking of WRC structural models with ASD-linked variants\",\n      \"journal\": \"Protein science\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 / Weak — purely computational study, no in vitro reconstitution or mutagenesis experiment performed in this paper\",\n      \"pmids\": [\"39660913\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"Knockdown of NCKAP1 in endothelial cells disrupts the WAVE regulatory complex, impairs lamellipodia-based protrusions, suppresses paxillin phosphorylation (FAK-paxillin signaling), delays endothelial barrier formation, inhibits actin dynamics at intercellular junctions, and restricts angiogenesis, identifying WRC/NCKAP1 as a direct regulator of focal adhesions and endothelial barrier function.\",\n      \"method\": \"siRNA knockdown, lamellipodia imaging, phospho-paxillin western blot, endothelial barrier assay, angiogenesis assay\",\n      \"journal\": \"iScience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal functional assays (morphology, signaling, barrier, angiogenesis) in a single study with defined mechanistic pathway linkage\",\n      \"pmids\": [\"42095096\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"NCKAP1 (NAP125/HEM2) is a core structural subunit of the pentameric WAVE regulatory complex (WRC) that couples RAC1 GTPase signaling to Arp2/3-dependent branched actin polymerization; it maintains WRC integrity by bridging CYFIP1/2 and WASF proteins, enables RAC1 recruitment to the complex, drives lamellipodia formation and cell migration, supports neuronal migration during cortical development, is required for microglial phagocytosis via actin dynamics, and coordinates focal adhesion (FAK-paxillin) and adherens junction remodeling in endothelial cells, while in certain cellular contexts (e.g., hepatocellular carcinoma lacking WASF1) it can alternatively modulate the cell cycle through Rb1/p53 upregulation.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"NCKAP1 is a core structural subunit of the WAVE regulatory complex (WRC) that couples RAC1 GTPase signaling to branched actin polymerization, driving cell motility across normal and malignant contexts [#0]. It maintains WRC integrity by bridging CYFIP and WASF subunits: silencing NCKAP1 destabilizes the WASF3 complex and prevents RAC1 from associating with it, and stapled peptides targeting the NCKAP1–CYFIP1 interface reproduce this disassembly and RAC1 dissociation, abolishing cancer cell invasion and metastasis [#0]. Through WRC-dependent actin dynamics, NCKAP1 supports lamellipodial protrusion and coordinates FAK–paxillin focal adhesion signaling and adherens junction remodeling in endothelial cells, thereby enabling endothelial barrier formation and angiogenesis [#8]. The same actin-polymerizing function is required for proper neuronal migration during cortical development [#4] and for microglial phagocytosis, where reduced NCKAP1 produces defective actin polymerization that overexpression rescues [#6]. In vivo, NCKAP1 loss in a melanoma model delays tumor onset and proliferation while remodeling stroma and immune infiltration, linking WRC-driven actin assembly to tumor tissue integrity [#5]. In a hepatocellular carcinoma context lacking WASF1, NCKAP1 overexpression instead upregulates Rb1 and p53 and arrests cell-cycle progression, indicating a context-dependent role outside the canonical invasion axis [#3]. Autism-linked missense variants cluster at the NCKAP1–CYFIP2 interface and predominantly weaken NCKAP1 binding to the WRC [#7].\",\n  \"teleology\": [\n    {\n      \"year\": 2000,\n      \"claim\": \"Established the first functional consequence of losing NCKAP1 in neurons, framing it as a pro-survival factor before any molecular mechanism was known.\",\n      \"evidence\": \"Antisense oligonucleotide knockdown with apoptosis readout in neuronal cells\",\n      \"pmids\": [\"10673335\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No molecular mechanism linking knockdown to apoptosis\", \"Pro-survival role not connected to actin or WRC function at this stage\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Placed NCKAP1 within a Nck/c-Abl tyrosine kinase signaling network via a binding partner, an early hint of its role in signal transduction.\",\n      \"evidence\": \"Yeast two-hybrid screen identifying hNap1BP interaction\",\n      \"pmids\": [\"11418237\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Single yeast two-hybrid without reciprocal Co-IP or reconstitution\", \"Functional relevance of the Nck network to actin regulation untested\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Defined NCKAP1 as a core structural subunit holding the WAVE/WASF3 complex together and enabling RAC1 recruitment, mechanistically explaining its requirement for invasion and metastasis.\",\n      \"evidence\": \"siRNA silencing, reciprocal Co-IP, RAC1 binding assay, stapled-peptide interface disruption, and in vivo metastasis model across multiple cancer lines\",\n      \"pmids\": [\"27432794\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Atomic details of the NCKAP1–CYFIP1 interface not resolved here\", \"Whether destabilization is identical across all WASF paralogs not addressed\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Revealed a non-canonical, WRC-independent role in which NCKAP1 modulates the cell cycle through Rb1/p53 in a cellular context lacking WASF1.\",\n      \"evidence\": \"NCKAP1 overexpression with Rb1/p53 western blot, cell-cycle FACS, and xenograft model in HCC cells\",\n      \"pmids\": [\"31068575\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism connecting NCKAP1 to Rb1/p53 upregulation unknown\", \"Whether this is direct or secondary to altered actin signaling unresolved\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Demonstrated an in vivo developmental requirement for NCKAP1 in neuronal cytoskeletal dynamics and cortical neuronal migration.\",\n      \"evidence\": \"In utero electroporation with Nckap1 loss-of-function constructs and cortical migration assay in mouse\",\n      \"pmids\": [\"33157009\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"WRC dependence of the migration defect not directly tested in this system\", \"Downstream actin effectors in migrating neurons not identified\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Showed via conditional knockout that NCKAP1-driven actin polymerization is required for tumor tissue integrity, proliferation, and shaping of the stromal/immune microenvironment in vivo.\",\n      \"evidence\": \"Melanocyte-lineage Nckap1 knockout in a BRAF(V600E);Pten-loss model with tumor growth, proliferation, collagen, and immune-marker readouts\",\n      \"pmids\": [\"32777214\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism linking actin assembly to stromal fibrosis and immune infiltration not dissected\", \"Cell-autonomous versus microenvironmental contributions not separated\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Established that NCKAP1-mediated actin dynamics are necessary for microglial phagocytosis, with overexpression sufficient to rescue the defect in patient-derived cells.\",\n      \"evidence\": \"Transcriptomic identification in ALS patient iMGs plus NCKAP1 overexpression rescue and phagocytosis assay\",\n      \"pmids\": [\"37154887\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab study without genetic knockout confirmation\", \"Connection to WRC subunits in microglia not directly shown\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Extended NCKAP1/WRC function to endothelial biology, linking it directly to FAK–paxillin focal adhesion signaling, junction remodeling, barrier formation, and angiogenesis.\",\n      \"evidence\": \"siRNA knockdown with lamellipodia imaging, phospho-paxillin western blot, endothelial barrier and angiogenesis assays\",\n      \"pmids\": [\"42095096\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether NCKAP1 regulates FAK–paxillin directly or via actin remodeling not separated\", \"Single-study mechanistic pathway not yet independently replicated\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How disease-associated NCKAP1 missense variants quantitatively alter WRC assembly and downstream actin output in vivo remains unresolved.\",\n      \"evidence\": \"Computational hotspot analysis of ASD-linked variants at the NCKAP1–CYFIP2 interface predicting altered binding affinity\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Purely computational; no mutagenesis or reconstitution performed\", \"Predicted affinity changes not validated against cellular WRC stability or actin phenotypes\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [0, 7]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [8]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [8]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [4]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [3, 5]}\n    ],\n    \"complexes\": [\"WAVE regulatory complex (WRC)\", \"WASF3/WAVE complex\"],\n    \"partners\": [\"CYFIP1\", \"CYFIP2\", \"WASF3\", \"RAC1\", \"WASF1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}