{"gene":"DOCK4","run_date":"2026-06-09T23:54:42","timeline":{"discoveries":[{"year":2003,"finding":"DOCK4 specifically activates Rap GTPase (Rap1), enhancing the formation of adherens junctions. A recurrent missense mutant found in human prostate and ovarian cancers is defective in Rap1 activation. Wild-type DOCK4 rescues the engulfment defect of C. elegans ced-5 mutants, but the mutant allele does not.","method":"GTPase activation assays, C. elegans genetic rescue, soft agar colony formation and in vivo tumor invasion assays","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — multiple orthogonal methods (biochemical GEF assay, genetic epistasis in C. elegans, in vivo tumor suppression), replicated across model systems in a single rigorous study","pmids":["12628187"],"is_preprint":false},{"year":2006,"finding":"DOCK4 is regulated upstream by the small GTPase RhoG and its effector ELMO: active RhoG induces translocation of the DOCK4-ELMO complex from cytoplasm to the plasma membrane, enhancing DOCK4/ELMO-dependent Rac1 activation and cell migration. DOCK4 knockdown in NIH3T3 cells reduces cell migration.","method":"Co-immunoprecipitation, fluorescence localization, Rac1 GTPase activation assay (GST-PAK pull-down), RNAi knockdown with migration assay","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP, GEF assay, and RNAi phenotype in a single lab with two orthogonal methods","pmids":["17027967"],"is_preprint":false},{"year":2006,"finding":"A novel DOCK4 isoform (DOCK4-Ex49) is expressed in brain, eye, and inner ear tissues, localizes to stereocilia hair bundles in the inner ear, binds nucleotide-free Rac as effectively as DOCK2, and is a potent Rac activator. DOCK4-Ex49 interacts with harmonin (USH1C) via yeast two-hybrid.","method":"Yeast two-hybrid, immunostaining with isoform-specific antibody, Rac nucleotide-free binding assay","journal":"Journal of molecular biology","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — direct localization experiment tied to functional context (Rac activation), yeast two-hybrid interaction, single lab","pmids":["16464467"],"is_preprint":false},{"year":2008,"finding":"DOCK4 mediates Wnt-induced Rac activation in the canonical Wnt/β-catenin pathway. DOCK4 interacts biochemically with the β-catenin degradation complex (APC, Axin, GSK3β); this interaction enhances β-catenin stability and Axin degradation. GSK3β phosphorylates DOCK4, which enhances Wnt-induced Rac activation. DOCK4 is required for Wnt/β-catenin activity in vivo in zebrafish.","method":"Co-immunoprecipitation, in vitro kinase assay, β-catenin stability assay, TCF reporter assay in zebrafish","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — biochemical interaction with degradation complex, in vitro kinase assay establishing GSK3β as writer, in vivo genetic validation in zebrafish, multiple orthogonal methods","pmids":["18641688"],"is_preprint":false},{"year":2008,"finding":"DOCK4 (a Rac GEF) regulates dendritic growth and branching in hippocampal neurons. Knockdown reduces dendritic growth and branching; overexpression with ELMO2 enhances dendrite number and branching. These effects require Rac activation and the C-terminal Crk-binding region. DOCK4 forms a complex with ELMO2 and CrkII in hippocampal neurons.","method":"shRNA knockdown, overexpression, co-immunoprecipitation in neurons, dendritic morphometry","journal":"Journal of neuroscience research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss- and gain-of-function with defined morphological readout plus Co-IP identifying complex, single lab","pmids":["18615735"],"is_preprint":false},{"year":2008,"finding":"DOCK4 DHR-1 domain binds PIP3 (phosphatidylinositol 3,4,5-trisphosphate), as determined by PIP3-analog bead binding assay using deletion mutants. A novel splicing variant of DOCK4 also binds PIP3 via the DHR-1 domain.","method":"PIP3-analog bead pull-down assay with deletion mutants","journal":"IUBMB life","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — direct biochemical binding assay with domain mapping, single lab, single method","pmids":["18459162"],"is_preprint":false},{"year":2013,"finding":"DOCK4 is concentrated in dendritic spines and promotes spine formation via interaction with the actin-binding protein cortactin. shRNA knockdown of DOCK4 reduces spine density; rescue requires GEF activity and the cortactin-binding C-terminal region. Cortactin knockdown suppresses DOCK4-mediated spine formation.","method":"shRNA knockdown, co-immunoprecipitation, domain-deletion rescue experiments, spine density quantification in cultured neurons","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal loss-of-function, domain mapping, Co-IP, single lab","pmids":["23536706"],"is_preprint":false},{"year":2014,"finding":"DOCK4 forms a complex with SH3YL1 (a phosphoinositide-binding protein) through its C-terminal proline-rich region. SH3YL1 promotes DOCK4-mediated Rac1 activation and cell migration; mutations in the SH3YL1 phosphoinositide-binding domain abolish this promotion. Depletion of SH3YL1 suppresses cell migration in MDA-MB-231 cells.","method":"Co-immunoprecipitation, Rac1 GTPase activation assay, domain mutant analysis, shRNA knockdown with migration assay","journal":"Cellular signalling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, GEF activation assay, domain mutagenesis, and RNAi phenotype; single lab, multiple methods","pmids":["24508479"],"is_preprint":false},{"year":2015,"finding":"TGF-β induces DOCK4 expression via the Smad pathway (but not other DOCK family members) in lung adenocarcinoma cells, and DOCK4 mediates TGF-β pro-metastatic effects by activating Rac1 to enhance tumor cell protrusion, motility, invasion, and extravasation without affecting EMT.","method":"Smad pathway inhibitor experiments, DOCK4 knockdown/overexpression, Rac1 GTPase activation assay, invasion/migration assays, in vivo extravasation model","journal":"Genes & development","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — epistasis (Smad→DOCK4→Rac1), GEF assay, in vivo extravasation, single lab","pmids":["25644601"],"is_preprint":false},{"year":2015,"finding":"DOCK4 knockdown in primary bone marrow CD34+ stem cells leads to decreased erythroid colony formation and increased apoptosis. Mechanistically, reduced DOCK4 expression decreases RAC1 GTPase activation, leading to increased phosphorylation of the actin-stabilizing protein ADDUCIN, disrupting the F-actin filament network in erythroblasts and causing erythroid dysplasia.","method":"siRNA knockdown, F-actin single-cell assay, RAC1 GTPase activation assay, re-expression rescue in MDS patient erythroblasts","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — loss-of-function with defined molecular mechanism (RAC1→ADDUCIN phosphorylation), rescue experiment in patient cells, multiple orthogonal methods","pmids":["26578796"],"is_preprint":false},{"year":2017,"finding":"In glioblastoma, DOCK4 drives nuclear β-catenin accumulation through a feed-forward mechanism with β-catenin enabled by increased GSK3β activity; this results in miR-302 expression that represses cyclin D1, suppressing self-renewal and tumorigenicity of GBM stem-like cells.","method":"Overexpression, luciferase reporter, Western blot, sphere-formation and tumorigenicity assays","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gain-of-function with defined pathway (DOCK4→β-catenin→miR-302→cyclin D1), multiple functional readouts, single lab","pmids":["28925399"],"is_preprint":false},{"year":2019,"finding":"SR-B1 in endothelial cells recruits DOCK4 via an eight-amino-acid cytoplasmic domain of the receptor upon LDL binding. DOCK4 promotes SR-B1 internalization and LDL transcytosis across endothelial monolayers by coupling LDL-SR-B1 binding with RAC1 activation.","method":"Co-immunoprecipitation, domain deletion mutagenesis, transcytosis assay across endothelial monolayers, in vivo mouse atherosclerosis model with SR-B1/DOCK4 manipulation","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — direct binding domain mapped by mutagenesis, functional transcytosis assay, Rac1 activation assay, in vivo validation; multiple orthogonal methods","pmids":["31019307"],"is_preprint":false},{"year":2019,"finding":"Dock4 deficiency in hippocampal CA1 neurons reduces Rac1 activity, leading to downregulation of global protein synthesis and diminished AMPA and NMDA receptor subunit expression, decreased spine density, and attenuated excitatory synaptic transmission. Rac1 replenishment in CA1 of Dock4 KO mice restores excitatory synaptic transmission and corrects social deficits. Pharmacological NMDA receptor activation also restores social novelty preference.","method":"Conditional Dock4 knockout, Rac1 activity assay, electrophysiology, Western blot for receptor subunits, viral Rac1 rescue, pharmacological rescue","journal":"Molecular psychiatry","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — conditional KO with defined circuit phenotype, Rac1 activity assay, protein synthesis measurement, electrophysiology, and two independent rescue strategies (genetic + pharmacological)","pmids":["31388105"],"is_preprint":false},{"year":2019,"finding":"Reduced DOCK4 expression in -7q MDS HSCs leads to increased tyrosine phosphorylation of LYN kinase and phosphatases SHIP1 and SHP1. Increased SHIP1/SHP1 phosphorylation is caused by LYN kinase targeting these as substrates. These signaling alterations increase migration and impede HSC differentiation. Pharmacologic inhibition of SHP1 reverses these functional aberrations.","method":"Phosphoproteomics, siRNA knockdown, kinase-substrate assay, pharmacological rescue in primary human HSCs and MDS patient samples","journal":"Clinical cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — phosphoproteomics plus functional pharmacological rescue, single lab","pmids":["31308061"],"is_preprint":false},{"year":2020,"finding":"Two DOCK4 variants associated with ASD/dyslexia (Exon27-52 deletion producing Dock4-945VS and missense R853H) show decreased ability to activate both Rac1 and Rap1, are dysfunctional for regulation of cell morphology and cytoskeleton, and have compromised ability to promote neurite outgrowth, dendritic spine formation, and excitatory synaptic transmission.","method":"GTPase activation assay (Rac1 and Rap1), cell morphology analysis, neurite outgrowth assay in Neuro-2a and hippocampal neurons, electrophysiology","journal":"Frontiers in cellular neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple functional assays with disease-linked variant mutagenesis, single lab","pmids":["32009906"],"is_preprint":false},{"year":2020,"finding":"DOCK4 overexpression in cytotrophoblasts increases invasiveness consistent with placenta accreta spectrum phenotype; DOCK4 was the most highly up-regulated gene in PAS cytotrophoblasts compared to controls.","method":"DOCK4 overexpression in CTB cells with invasion assay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single overexpression experiment with invasion readout, no mechanistic pathway follow-up","pmids":["32576693"],"is_preprint":false},{"year":2021,"finding":"USP36 (a deubiquitinating enzyme) directly binds DOCK4 and mediates its deubiquitination, thereby stabilizing DOCK4 protein levels, which activates Wnt/β-catenin signaling and induces EMT in diabetic renal tubular epithelial cells.","method":"Co-immunoprecipitation, ubiquitination assay, overexpression/knockdown with Western blot and EMT marker analysis","journal":"Frontiers in cell and developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct binding and deubiquitination assay establishing USP36 as eraser of DOCK4 ubiquitination, single lab","pmids":["33968925"],"is_preprint":false},{"year":2021,"finding":"DOCK4 regulates goblet cell differentiation and MUC2 production in the intestine. DOCK4 knockout mice show disordered intestinal epithelium, shortage of goblet cells, and reduced expression of MUC2 and differentiation factors Gfi1 and Spdef. DOCK4 overexpression increases these factors, while siRNA knockdown decreases them in HT-29 cells.","method":"Dock4 knockout mice, siRNA knockdown, overexpression in HT-29 cells, qPCR and Western blot","journal":"Journal of cellular physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo KO plus in vitro gain/loss-of-function with defined molecular readouts, single lab","pmids":["33559155"],"is_preprint":false},{"year":2022,"finding":"DOCK4 deficiency in pulmonary endothelial cells leads to increased basal vascular permeability, hemorrhage in lung, and impaired S1P-induced barrier restoration. DOCK4 rapidly translocates to the cell periphery and associates with detergent-insoluble fraction following S1P treatment; its absence prevents S1P-induced Rac1 activation. DOCK4-silenced cells show enhanced basal permeability associated with enhanced RhoA activation, indicating DOCK4 maintains adherens junctions by balancing RhoA and Rac1 activity.","method":"DOCK4-deficient mice, DOCK4 silencing/reconstitution in human pulmonary artery endothelial cells, permeability assay, GTPase activation assays, subcellular fractionation, S1P treatment","journal":"Arteriosclerosis, thrombosis, and vascular biology","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — in vivo KO plus in vitro reconstitution, GEF activation assays, translocation assay, permeability assay; multiple orthogonal methods","pmids":["35477279"],"is_preprint":false},{"year":2022,"finding":"Dock4/Rac1/β-catenin signaling is required for maintenance of cochlear hair cell stereocilia organization and hearing function. Dock4 knockdown in mice causes hair bundle deficits, increased oxidative stress, HC apoptosis, and progressive hearing loss; Rac1/β-catenin signaling is significantly downregulated in Dock4 KD cochleae.","method":"piggyBac transposon knockdown mice, auditory brainstem response, immunofluorescence, Western blot","journal":"Fundamental research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo knockdown with defined pathway (Rac1/β-catenin) and functional hearing readout, single lab","pmids":["38933554"],"is_preprint":false},{"year":2024,"finding":"HIF2α regulates Dock4 expression in normoxia in kidney epithelial cells; Dock4/Rac1/Pak1 signaling mediates stability and compaction of E-cadherin at nascent adherens junctions. HIF2α- or Dock4-deficient cells show aberrant cyst morphogenesis in 3D kidney epithelial cultures.","method":"HIF2α and Dock4 knockdown/depletion, E-cadherin localization assay, 3D cyst morphogenesis assay, Rac1/Pak1 activity assays","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function with defined pathway (HIF2α→Dock4→Rac1/Pak1→E-cadherin AJ), 3D functional readout, single lab","pmids":["38802496"],"is_preprint":false},{"year":2024,"finding":"Brain endothelial cell-secreted soluble factors activate EGFR signaling in triple-negative breast cancer cells via DOCK4, which is required for breast cancer cell extravasation to the brain in vivo. DOCK4 knockdown inhibits breast cancer cell entry to the brain and loss of elongated morphology preceding intercalation into brain endothelium. Brain endothelial cells promote mesenchymal-like morphology via DOCK4, DOCK9, RAC1, and CDC42.","method":"DOCK4 shRNA knockdown, in vivo brain extravasation assay, EGFR inhibitor (Afatinib), cell morphology analysis","journal":"Communications biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo extravasation assay plus in vitro signaling, single lab","pmids":["38762624"],"is_preprint":false},{"year":2024,"finding":"Dock4 deficiency in sensory neurons (DRG) increases heat nociception. Mechanistically, DOCK4 interacts with Nav1.7 sodium channel and acts as an adaptor that binds Dynein to form a Dynein/DOCK4/Nav1.7 complex, mediating trafficking of Nav1.7 from the membrane to the cytoplasm. DOCK4 expression in DRG neurons is decreased by histone H4K8 lactylation across pain models.","method":"Co-immunoprecipitation, Nav1.7 trafficking assay, DRG-specific Dock4 knockdown in mice and non-human primates, heat nociception behavioral tests, ChIP for H4K8 lactylation","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — direct protein complex identified by Co-IP, Nav1.7 trafficking assay, in vivo knockdown in two species, epigenetic regulation identified by ChIP; multiple orthogonal methods","pmids":["40759894"],"is_preprint":false},{"year":2025,"finding":"THEMIS2 acts as a molecular scaffold that recruits TBK1 to DOCK4, facilitating site-specific phosphorylation of DOCK4 at serine 1787 (S1787). This post-translational modification enables DOCK4 to engage with CRKII, subsequently triggering Rap1 signaling activation, which promotes ovarian cancer cell metastasis.","method":"Immunoprecipitation-mass spectrometry, GST pull-down for active Rap1, site-specific mutagenesis, in vitro and in vivo metastasis assays","journal":"Cellular oncology","confidence":"Medium","confidence_rationale":"Tier 1-2 / Moderate — IP-MS identifying complex, site-specific phosphorylation mapped, Rap1 activation assay; single lab","pmids":["40227532"],"is_preprint":false},{"year":2024,"finding":"Dock4 promotes excitatory synaptic transmission in spinal cord neurons by promoting GluN2B expression at synaptic sites and synaptogenesis. Dock4 knockdown prevents dendritic growth, synaptogenesis, and the increase in GTP-Rac1 and GluN2B induced by spinal nerve ligation.","method":"Rac1 GTPase activation assay, Western blot, immunofluorescence, electrophysiology (patch-clamp), RNAi knockdown in dorsal spinal neurons","journal":"Frontiers in molecular neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RNAi knockdown with electrophysiology and defined molecular pathway (Rac1→GluN2B), single lab","pmids":["39282658"],"is_preprint":false},{"year":2024,"finding":"Loss-of-function variants in DOCK4 (missense and null) impair neurite outgrowth in Neuro-2A cells. Dock4 knockout Neuro-2A cells also exhibit defects in neurite outgrowth. Molecular modeling of missense variants suggests disruption of globular DOCK4 structure.","method":"In vitro functional expression in Neuro-2A cells, DOCK4 knockout Neuro-2A cells, molecular modeling","journal":"Human genetics","confidence":"Low","confidence_rationale":"Tier 3 / Weak — cell-based overexpression assay without full mechanistic pathway follow-up, single lab","pmids":["38526744"],"is_preprint":false}],"current_model":"DOCK4 is an unconventional guanine nucleotide exchange factor (GEF) of the DOCK180/CDM family that activates Rac1 and Rap1 GTPases; it is recruited to the plasma membrane via upstream signals including RhoG/ELMO, PIP3 binding through its DHR-1 domain, S1P, and receptor cytoplasmic domain interactions (e.g., SR-B1), where it drives actin cytoskeletal remodeling to regulate adherens junction formation, cell migration, LDL transcytosis, dendritic spine formation, excitatory synaptic transmission, and erythroid differentiation; DOCK4 also functions as a scaffold in the Wnt/β-catenin degradation complex and its activity is post-translationally regulated by GSK3β-mediated phosphorylation, USP36-mediated deubiquitination, and TBK1-mediated phosphorylation at S1787 (enabling CrkII engagement and Rap1 activation), while acting as a Dynein adaptor for Nav1.7 trafficking in sensory neurons."},"narrative":{"mechanistic_narrative":"DOCK4 is an unconventional guanine nucleotide exchange factor of the DOCK180/CDM family that activates the small GTPases Rac1 and Rap1 to drive actin cytoskeletal remodeling across diverse cellular contexts, from adherens junction assembly to neuronal morphogenesis [PMID:12628187, PMID:17027967, PMID:31388105]. It was first defined as a Rap1 activator that promotes adherens junction formation and behaves as a tumor suppressor, with a cancer-derived missense mutant defective in Rap1 activation and unable to rescue the engulfment defect of C. elegans ced-5 mutants [PMID:12628187]. Membrane recruitment and activity are governed by multiple upstream inputs: active RhoG drives translocation of the DOCK4–ELMO complex to the plasma membrane to enhance Rac1 activation and migration [PMID:17027967], the DHR-1 domain binds PIP3 [PMID:18459162], and accessory partners SH3YL1 and CrkII potentiate GEF output [PMID:24508479, PMID:18615735]. In endothelial cells, DOCK4 is recruited by the cytoplasmic tail of the LDL receptor SR-B1 to couple LDL binding to Rac1 activation and LDL transcytosis [PMID:31019307], and it maintains the endothelial barrier by balancing RhoA and Rac1 activity downstream of S1P [PMID:35477279]. Beyond GEF activity, DOCK4 acts as a scaffold within the β-catenin degradation complex (APC/Axin/GSK3β), where GSK3β-mediated phosphorylation links DOCK4 to Wnt-induced Rac activation and β-catenin signaling [PMID:18641688], and it serves as a Dynein adaptor that binds the Nav1.7 sodium channel to traffic it from the membrane in sensory neurons, thereby restraining heat nociception [PMID:40759894]. In the nervous system, DOCK4 promotes dendritic growth, spine formation via cortactin, and excitatory synaptic transmission through Rac1-dependent control of glutamate receptor expression, and its conditional loss produces social deficits reversible by Rac1 or NMDA receptor restoration [PMID:18615735, PMID:23536706, PMID:31388105]. DOCK4 protein levels are further controlled by USP36-mediated deubiquitination [PMID:33968925], and site-specific phosphorylation at S1787 by TBK1 (scaffolded by THEMIS2) enables CrkII engagement and Rap1 activation [PMID:40227532]. Disease-associated DOCK4 variants linked to autism spectrum disorder and dyslexia are deficient in Rac1/Rap1 activation and impair neurite outgrowth, spine formation, and synaptic transmission [PMID:32009906].","teleology":[{"year":2003,"claim":"Established DOCK4 as a functional GEF, identifying Rap1 as its target and linking its activity to adherens junction formation and tumor suppression.","evidence":"GTPase activation assays, C. elegans ced-5 genetic rescue, soft agar and in vivo tumor invasion assays with a cancer-derived missense mutant","pmids":["12628187"],"confidence":"High","gaps":["Structural basis of nucleotide exchange not resolved","Relationship between Rap1 and Rac1 specificity left open"]},{"year":2006,"claim":"Defined the upstream activation logic, showing RhoG/ELMO recruits DOCK4 to the membrane to drive Rac1-dependent migration, and identified a tissue-specific isoform and a candidate inner-ear partner.","evidence":"Co-IP, fluorescence localization, GST-PAK Rac1 pull-down, RNAi migration assay; yeast two-hybrid and isoform-specific immunostaining","pmids":["17027967","16464467"],"confidence":"Medium","gaps":["Harmonin interaction by Y2H only, not validated in cells","How RhoG engagement is itself triggered unaddressed"]},{"year":2008,"claim":"Revealed dual roles beyond GEF activity: DOCK4 is a phosphorylated scaffold in the β-catenin degradation complex linking Wnt to Rac, binds PIP3 through its DHR-1 domain, and shapes dendritic morphology via ELMO2/CrkII.","evidence":"Co-IP, in vitro GSK3β kinase assay, zebrafish TCF reporter; PIP3-bead pull-down with deletion mutants; neuronal shRNA and morphometry","pmids":["18641688","18459162","18615735"],"confidence":"High","gaps":["Sites of GSK3β phosphorylation not mapped","How scaffold versus GEF functions are coordinated unclear"]},{"year":2013,"claim":"Connected DOCK4 GEF activity to a specific actin effector, showing cortactin binding is required for dendritic spine formation.","evidence":"shRNA, Co-IP, domain-deletion rescue, spine density quantification in cultured neurons","pmids":["23536706"],"confidence":"Medium","gaps":["Whether cortactin is a direct Rac1 effector downstream of DOCK4 not resolved"]},{"year":2014,"claim":"Identified SH3YL1 as a phosphoinositide-binding cofactor that potentiates DOCK4-mediated Rac1 activation and migration.","evidence":"Co-IP, Rac1 activation assay, domain mutagenesis, shRNA migration assay in MDA-MB-231","pmids":["24508479"],"confidence":"Medium","gaps":["Single cell line; in vivo relevance of SH3YL1 cofactor role untested"]},{"year":2015,"claim":"Extended DOCK4 function to cancer metastasis and hematopoiesis, placing it downstream of TGF-β/Smad to drive invasion and showing it sustains erythroid differentiation through a RAC1→ADDUCIN→F-actin axis.","evidence":"Smad inhibitor epistasis, knockdown/overexpression, Rac1 assays, invasion and in vivo extravasation; siRNA, F-actin assay, RAC1 assay, rescue in MDS patient erythroblasts","pmids":["25644601","26578796"],"confidence":"High","gaps":["Mechanism of TGF-β/Smad-specific DOCK4 induction not detailed","Direct kinase responsible for ADDUCIN phosphorylation not identified"]},{"year":2017,"claim":"Showed a context-dependent tumor-suppressive output in glioblastoma, where DOCK4 drives a β-catenin/miR-302/cyclin D1 cascade to limit stem-like self-renewal.","evidence":"Overexpression, luciferase reporter, sphere-formation and tumorigenicity assays","pmids":["28925399"],"confidence":"Medium","gaps":["Reconciliation with pro-metastatic roles in other tumors unaddressed","Whether GEF activity is required not tested"]},{"year":2019,"claim":"Demonstrated receptor-coupled and circuit-level functions: SR-B1 recruits DOCK4 to drive LDL transcytosis, DOCK4 sustains CA1 excitatory transmission and social behavior via Rac1, and its loss in MDS HSCs perturbs LYN/SHIP1/SHP1 signaling.","evidence":"Co-IP and domain mapping with transcytosis and atherosclerosis models; conditional KO, electrophysiology, Rac1 and genetic/pharmacological rescue; phosphoproteomics and pharmacological rescue in MDS samples","pmids":["31019307","31388105","31308061"],"confidence":"High","gaps":["Direct vs indirect link between DOCK4 loss and LYN activation not fully resolved","How Rac1 controls global protein synthesis mechanistically unclear"]},{"year":2020,"claim":"Tied disease-associated DOCK4 variants to functional deficits, showing ASD/dyslexia alleles fail to activate Rac1/Rap1 and impair neuronal morphology and synaptic transmission.","evidence":"Rac1/Rap1 activation assays, cell morphology, neurite outgrowth, electrophysiology with disease variants","pmids":["32009906"],"confidence":"Medium","gaps":["No animal model carrying the patient variants","Penetrance and genetic context of variants not established"]},{"year":2021,"claim":"Identified DOCK4 protein stability and tissue-specific differentiation roles, with USP36 deubiquitinating DOCK4 to activate Wnt/β-catenin and DOCK4 controlling goblet cell differentiation via Gfi1/Spdef/MUC2.","evidence":"Co-IP and ubiquitination assays; Dock4 KO mice, siRNA, overexpression with qPCR/Western","pmids":["33968925","33559155"],"confidence":"Medium","gaps":["E3 ligase opposing USP36 not identified","Whether goblet cell role requires GEF activity untested"]},{"year":2022,"claim":"Established DOCK4 as a balancer of RhoA/Rac1 activity maintaining the endothelial barrier downstream of S1P and as a driver of cochlear hair cell maintenance via Rac1/β-catenin.","evidence":"DOCK4-deficient mice and reconstitution in endothelial cells, permeability, GTPase, fractionation, S1P assays; piggyBac knockdown mice with ABR and histology","pmids":["35477279","38933554"],"confidence":"High","gaps":["How S1P signaling triggers DOCK4 translocation mechanistically unclear","Hair cell findings rely on knockdown only"]},{"year":2024,"claim":"Expanded the mechanistic repertoire with epithelial morphogenesis (HIF2α→Dock4→Rac1/Pak1→E-cadherin), brain metastasis via EGFR/DOCK4/Rac1-CDC42, and a non-GEF adaptor role bridging Dynein and Nav1.7 to control nociception.","evidence":"Knockdown and 3D cyst assays with Rac1/Pak1 readouts; shRNA brain extravasation with EGFR inhibitor; Co-IP, Nav1.7 trafficking assay, DRG knockdown in mice and primates, ChIP for H4K8 lactylation","pmids":["38802496","38762624","40759894"],"confidence":"High","gaps":["Structural basis of the Dynein/DOCK4/Nav1.7 complex undefined","How lactylation-driven DOCK4 repression integrates with GEF signaling unclear"]},{"year":2025,"claim":"Defined a phospho-switch controlling DOCK4 Rap1 output, with THEMIS2 scaffolding TBK1 to phosphorylate S1787 and enable CrkII binding and Rap1 activation in cancer metastasis.","evidence":"IP-MS, site-specific mutagenesis, active Rap1 GST pull-down, in vitro/in vivo metastasis assays","pmids":["40227532"],"confidence":"Medium","gaps":["Whether S1787 phosphorylation also affects Rac1 activity untested","Phosphatase reversing S1787 not identified"]},{"year":null,"claim":"How DOCK4 selects between Rac1 and Rap1 outputs, and how its scaffold, GEF, and Dynein-adaptor functions are integrated across cell types, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model of DOCK4 GEF or adaptor complexes","Determinants of Rac1- versus Rap1-directed activity not defined","Context-dependent tumor-suppressive versus pro-metastatic switch unexplained"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,1,8,9,11,23]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,1,11,18]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[3,22]},{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[5]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[6,9]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[1,11,18]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[1]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[6,9]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,1,3,11,18]},{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[4,6,12,24]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[8,9,13,21,23]},{"term_id":"R-HSA-1474244","term_label":"Extracellular matrix organization","supporting_discovery_ids":[0,18,20]},{"term_id":"R-HSA-9609507","term_label":"Protein localization","supporting_discovery_ids":[11,22]}],"complexes":["DOCK4-ELMO complex","β-catenin degradation complex (APC/Axin/GSK3β)","Dynein/DOCK4/Nav1.7 complex"],"partners":["ELMO2","CRKII","SH3YL1","GSK3B","SR-B1","USP36","TBK1","NAV1.7"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q8N1I0","full_name":"Dedicator of cytokinesis protein 4","aliases":[],"length_aa":1966,"mass_kda":225.2,"function":"Functions as a guanine nucleotide exchange factor (GEF) that promotes the exchange of GDP to GTP, converting inactive GDP-bound small GTPases into their active GTP-bound form (PubMed:12628187, PubMed:16464467). Involved in regulation of adherens junction between cells (PubMed:12628187). Plays a role in cell migration (PubMed:20679435) Has a higher guanine nucleotide exchange factor activity compared to other isoforms","subcellular_location":"Cell membrane; Cell projection; Cytoplasm, cytosol","url":"https://www.uniprot.org/uniprotkb/Q8N1I0/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/DOCK4","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/DOCK4","total_profiled":1310},"omim":[{"mim_id":"618871","title":"RHO GUANINE NUCLEOTIDE EXCHANGE FACTOR 16; ARHGEF16","url":"https://www.omim.org/entry/618871"},{"mim_id":"618191","title":"CEA CELL ADHESION MOLECULE 21; CEACAM21","url":"https://www.omim.org/entry/618191"},{"mim_id":"617314","title":"SH3 DOMAIN- AND SYLF 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specifically activates Rap GTPase (Rap1), enhancing the formation of adherens junctions. A recurrent missense mutant found in human prostate and ovarian cancers is defective in Rap1 activation. Wild-type DOCK4 rescues the engulfment defect of C. elegans ced-5 mutants, but the mutant allele does not.\",\n      \"method\": \"GTPase activation assays, C. elegans genetic rescue, soft agar colony formation and in vivo tumor invasion assays\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — multiple orthogonal methods (biochemical GEF assay, genetic epistasis in C. elegans, in vivo tumor suppression), replicated across model systems in a single rigorous study\",\n      \"pmids\": [\"12628187\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"DOCK4 is regulated upstream by the small GTPase RhoG and its effector ELMO: active RhoG induces translocation of the DOCK4-ELMO complex from cytoplasm to the plasma membrane, enhancing DOCK4/ELMO-dependent Rac1 activation and cell migration. DOCK4 knockdown in NIH3T3 cells reduces cell migration.\",\n      \"method\": \"Co-immunoprecipitation, fluorescence localization, Rac1 GTPase activation assay (GST-PAK pull-down), RNAi knockdown with migration assay\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP, GEF assay, and RNAi phenotype in a single lab with two orthogonal methods\",\n      \"pmids\": [\"17027967\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"A novel DOCK4 isoform (DOCK4-Ex49) is expressed in brain, eye, and inner ear tissues, localizes to stereocilia hair bundles in the inner ear, binds nucleotide-free Rac as effectively as DOCK2, and is a potent Rac activator. DOCK4-Ex49 interacts with harmonin (USH1C) via yeast two-hybrid.\",\n      \"method\": \"Yeast two-hybrid, immunostaining with isoform-specific antibody, Rac nucleotide-free binding assay\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — direct localization experiment tied to functional context (Rac activation), yeast two-hybrid interaction, single lab\",\n      \"pmids\": [\"16464467\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"DOCK4 mediates Wnt-induced Rac activation in the canonical Wnt/β-catenin pathway. DOCK4 interacts biochemically with the β-catenin degradation complex (APC, Axin, GSK3β); this interaction enhances β-catenin stability and Axin degradation. GSK3β phosphorylates DOCK4, which enhances Wnt-induced Rac activation. DOCK4 is required for Wnt/β-catenin activity in vivo in zebrafish.\",\n      \"method\": \"Co-immunoprecipitation, in vitro kinase assay, β-catenin stability assay, TCF reporter assay in zebrafish\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — biochemical interaction with degradation complex, in vitro kinase assay establishing GSK3β as writer, in vivo genetic validation in zebrafish, multiple orthogonal methods\",\n      \"pmids\": [\"18641688\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"DOCK4 (a Rac GEF) regulates dendritic growth and branching in hippocampal neurons. Knockdown reduces dendritic growth and branching; overexpression with ELMO2 enhances dendrite number and branching. These effects require Rac activation and the C-terminal Crk-binding region. DOCK4 forms a complex with ELMO2 and CrkII in hippocampal neurons.\",\n      \"method\": \"shRNA knockdown, overexpression, co-immunoprecipitation in neurons, dendritic morphometry\",\n      \"journal\": \"Journal of neuroscience research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss- and gain-of-function with defined morphological readout plus Co-IP identifying complex, single lab\",\n      \"pmids\": [\"18615735\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"DOCK4 DHR-1 domain binds PIP3 (phosphatidylinositol 3,4,5-trisphosphate), as determined by PIP3-analog bead binding assay using deletion mutants. A novel splicing variant of DOCK4 also binds PIP3 via the DHR-1 domain.\",\n      \"method\": \"PIP3-analog bead pull-down assay with deletion mutants\",\n      \"journal\": \"IUBMB life\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — direct biochemical binding assay with domain mapping, single lab, single method\",\n      \"pmids\": [\"18459162\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"DOCK4 is concentrated in dendritic spines and promotes spine formation via interaction with the actin-binding protein cortactin. shRNA knockdown of DOCK4 reduces spine density; rescue requires GEF activity and the cortactin-binding C-terminal region. Cortactin knockdown suppresses DOCK4-mediated spine formation.\",\n      \"method\": \"shRNA knockdown, co-immunoprecipitation, domain-deletion rescue experiments, spine density quantification in cultured neurons\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal loss-of-function, domain mapping, Co-IP, single lab\",\n      \"pmids\": [\"23536706\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"DOCK4 forms a complex with SH3YL1 (a phosphoinositide-binding protein) through its C-terminal proline-rich region. SH3YL1 promotes DOCK4-mediated Rac1 activation and cell migration; mutations in the SH3YL1 phosphoinositide-binding domain abolish this promotion. Depletion of SH3YL1 suppresses cell migration in MDA-MB-231 cells.\",\n      \"method\": \"Co-immunoprecipitation, Rac1 GTPase activation assay, domain mutant analysis, shRNA knockdown with migration assay\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, GEF activation assay, domain mutagenesis, and RNAi phenotype; single lab, multiple methods\",\n      \"pmids\": [\"24508479\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"TGF-β induces DOCK4 expression via the Smad pathway (but not other DOCK family members) in lung adenocarcinoma cells, and DOCK4 mediates TGF-β pro-metastatic effects by activating Rac1 to enhance tumor cell protrusion, motility, invasion, and extravasation without affecting EMT.\",\n      \"method\": \"Smad pathway inhibitor experiments, DOCK4 knockdown/overexpression, Rac1 GTPase activation assay, invasion/migration assays, in vivo extravasation model\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — epistasis (Smad→DOCK4→Rac1), GEF assay, in vivo extravasation, single lab\",\n      \"pmids\": [\"25644601\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"DOCK4 knockdown in primary bone marrow CD34+ stem cells leads to decreased erythroid colony formation and increased apoptosis. Mechanistically, reduced DOCK4 expression decreases RAC1 GTPase activation, leading to increased phosphorylation of the actin-stabilizing protein ADDUCIN, disrupting the F-actin filament network in erythroblasts and causing erythroid dysplasia.\",\n      \"method\": \"siRNA knockdown, F-actin single-cell assay, RAC1 GTPase activation assay, re-expression rescue in MDS patient erythroblasts\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — loss-of-function with defined molecular mechanism (RAC1→ADDUCIN phosphorylation), rescue experiment in patient cells, multiple orthogonal methods\",\n      \"pmids\": [\"26578796\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"In glioblastoma, DOCK4 drives nuclear β-catenin accumulation through a feed-forward mechanism with β-catenin enabled by increased GSK3β activity; this results in miR-302 expression that represses cyclin D1, suppressing self-renewal and tumorigenicity of GBM stem-like cells.\",\n      \"method\": \"Overexpression, luciferase reporter, Western blot, sphere-formation and tumorigenicity assays\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain-of-function with defined pathway (DOCK4→β-catenin→miR-302→cyclin D1), multiple functional readouts, single lab\",\n      \"pmids\": [\"28925399\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"SR-B1 in endothelial cells recruits DOCK4 via an eight-amino-acid cytoplasmic domain of the receptor upon LDL binding. DOCK4 promotes SR-B1 internalization and LDL transcytosis across endothelial monolayers by coupling LDL-SR-B1 binding with RAC1 activation.\",\n      \"method\": \"Co-immunoprecipitation, domain deletion mutagenesis, transcytosis assay across endothelial monolayers, in vivo mouse atherosclerosis model with SR-B1/DOCK4 manipulation\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — direct binding domain mapped by mutagenesis, functional transcytosis assay, Rac1 activation assay, in vivo validation; multiple orthogonal methods\",\n      \"pmids\": [\"31019307\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Dock4 deficiency in hippocampal CA1 neurons reduces Rac1 activity, leading to downregulation of global protein synthesis and diminished AMPA and NMDA receptor subunit expression, decreased spine density, and attenuated excitatory synaptic transmission. Rac1 replenishment in CA1 of Dock4 KO mice restores excitatory synaptic transmission and corrects social deficits. Pharmacological NMDA receptor activation also restores social novelty preference.\",\n      \"method\": \"Conditional Dock4 knockout, Rac1 activity assay, electrophysiology, Western blot for receptor subunits, viral Rac1 rescue, pharmacological rescue\",\n      \"journal\": \"Molecular psychiatry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — conditional KO with defined circuit phenotype, Rac1 activity assay, protein synthesis measurement, electrophysiology, and two independent rescue strategies (genetic + pharmacological)\",\n      \"pmids\": [\"31388105\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Reduced DOCK4 expression in -7q MDS HSCs leads to increased tyrosine phosphorylation of LYN kinase and phosphatases SHIP1 and SHP1. Increased SHIP1/SHP1 phosphorylation is caused by LYN kinase targeting these as substrates. These signaling alterations increase migration and impede HSC differentiation. Pharmacologic inhibition of SHP1 reverses these functional aberrations.\",\n      \"method\": \"Phosphoproteomics, siRNA knockdown, kinase-substrate assay, pharmacological rescue in primary human HSCs and MDS patient samples\",\n      \"journal\": \"Clinical cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — phosphoproteomics plus functional pharmacological rescue, single lab\",\n      \"pmids\": [\"31308061\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Two DOCK4 variants associated with ASD/dyslexia (Exon27-52 deletion producing Dock4-945VS and missense R853H) show decreased ability to activate both Rac1 and Rap1, are dysfunctional for regulation of cell morphology and cytoskeleton, and have compromised ability to promote neurite outgrowth, dendritic spine formation, and excitatory synaptic transmission.\",\n      \"method\": \"GTPase activation assay (Rac1 and Rap1), cell morphology analysis, neurite outgrowth assay in Neuro-2a and hippocampal neurons, electrophysiology\",\n      \"journal\": \"Frontiers in cellular neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple functional assays with disease-linked variant mutagenesis, single lab\",\n      \"pmids\": [\"32009906\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"DOCK4 overexpression in cytotrophoblasts increases invasiveness consistent with placenta accreta spectrum phenotype; DOCK4 was the most highly up-regulated gene in PAS cytotrophoblasts compared to controls.\",\n      \"method\": \"DOCK4 overexpression in CTB cells with invasion assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single overexpression experiment with invasion readout, no mechanistic pathway follow-up\",\n      \"pmids\": [\"32576693\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"USP36 (a deubiquitinating enzyme) directly binds DOCK4 and mediates its deubiquitination, thereby stabilizing DOCK4 protein levels, which activates Wnt/β-catenin signaling and induces EMT in diabetic renal tubular epithelial cells.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, overexpression/knockdown with Western blot and EMT marker analysis\",\n      \"journal\": \"Frontiers in cell and developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct binding and deubiquitination assay establishing USP36 as eraser of DOCK4 ubiquitination, single lab\",\n      \"pmids\": [\"33968925\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"DOCK4 regulates goblet cell differentiation and MUC2 production in the intestine. DOCK4 knockout mice show disordered intestinal epithelium, shortage of goblet cells, and reduced expression of MUC2 and differentiation factors Gfi1 and Spdef. DOCK4 overexpression increases these factors, while siRNA knockdown decreases them in HT-29 cells.\",\n      \"method\": \"Dock4 knockout mice, siRNA knockdown, overexpression in HT-29 cells, qPCR and Western blot\",\n      \"journal\": \"Journal of cellular physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo KO plus in vitro gain/loss-of-function with defined molecular readouts, single lab\",\n      \"pmids\": [\"33559155\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"DOCK4 deficiency in pulmonary endothelial cells leads to increased basal vascular permeability, hemorrhage in lung, and impaired S1P-induced barrier restoration. DOCK4 rapidly translocates to the cell periphery and associates with detergent-insoluble fraction following S1P treatment; its absence prevents S1P-induced Rac1 activation. DOCK4-silenced cells show enhanced basal permeability associated with enhanced RhoA activation, indicating DOCK4 maintains adherens junctions by balancing RhoA and Rac1 activity.\",\n      \"method\": \"DOCK4-deficient mice, DOCK4 silencing/reconstitution in human pulmonary artery endothelial cells, permeability assay, GTPase activation assays, subcellular fractionation, S1P treatment\",\n      \"journal\": \"Arteriosclerosis, thrombosis, and vascular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — in vivo KO plus in vitro reconstitution, GEF activation assays, translocation assay, permeability assay; multiple orthogonal methods\",\n      \"pmids\": [\"35477279\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Dock4/Rac1/β-catenin signaling is required for maintenance of cochlear hair cell stereocilia organization and hearing function. Dock4 knockdown in mice causes hair bundle deficits, increased oxidative stress, HC apoptosis, and progressive hearing loss; Rac1/β-catenin signaling is significantly downregulated in Dock4 KD cochleae.\",\n      \"method\": \"piggyBac transposon knockdown mice, auditory brainstem response, immunofluorescence, Western blot\",\n      \"journal\": \"Fundamental research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo knockdown with defined pathway (Rac1/β-catenin) and functional hearing readout, single lab\",\n      \"pmids\": [\"38933554\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"HIF2α regulates Dock4 expression in normoxia in kidney epithelial cells; Dock4/Rac1/Pak1 signaling mediates stability and compaction of E-cadherin at nascent adherens junctions. HIF2α- or Dock4-deficient cells show aberrant cyst morphogenesis in 3D kidney epithelial cultures.\",\n      \"method\": \"HIF2α and Dock4 knockdown/depletion, E-cadherin localization assay, 3D cyst morphogenesis assay, Rac1/Pak1 activity assays\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function with defined pathway (HIF2α→Dock4→Rac1/Pak1→E-cadherin AJ), 3D functional readout, single lab\",\n      \"pmids\": [\"38802496\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Brain endothelial cell-secreted soluble factors activate EGFR signaling in triple-negative breast cancer cells via DOCK4, which is required for breast cancer cell extravasation to the brain in vivo. DOCK4 knockdown inhibits breast cancer cell entry to the brain and loss of elongated morphology preceding intercalation into brain endothelium. Brain endothelial cells promote mesenchymal-like morphology via DOCK4, DOCK9, RAC1, and CDC42.\",\n      \"method\": \"DOCK4 shRNA knockdown, in vivo brain extravasation assay, EGFR inhibitor (Afatinib), cell morphology analysis\",\n      \"journal\": \"Communications biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo extravasation assay plus in vitro signaling, single lab\",\n      \"pmids\": [\"38762624\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Dock4 deficiency in sensory neurons (DRG) increases heat nociception. Mechanistically, DOCK4 interacts with Nav1.7 sodium channel and acts as an adaptor that binds Dynein to form a Dynein/DOCK4/Nav1.7 complex, mediating trafficking of Nav1.7 from the membrane to the cytoplasm. DOCK4 expression in DRG neurons is decreased by histone H4K8 lactylation across pain models.\",\n      \"method\": \"Co-immunoprecipitation, Nav1.7 trafficking assay, DRG-specific Dock4 knockdown in mice and non-human primates, heat nociception behavioral tests, ChIP for H4K8 lactylation\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — direct protein complex identified by Co-IP, Nav1.7 trafficking assay, in vivo knockdown in two species, epigenetic regulation identified by ChIP; multiple orthogonal methods\",\n      \"pmids\": [\"40759894\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"THEMIS2 acts as a molecular scaffold that recruits TBK1 to DOCK4, facilitating site-specific phosphorylation of DOCK4 at serine 1787 (S1787). This post-translational modification enables DOCK4 to engage with CRKII, subsequently triggering Rap1 signaling activation, which promotes ovarian cancer cell metastasis.\",\n      \"method\": \"Immunoprecipitation-mass spectrometry, GST pull-down for active Rap1, site-specific mutagenesis, in vitro and in vivo metastasis assays\",\n      \"journal\": \"Cellular oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — IP-MS identifying complex, site-specific phosphorylation mapped, Rap1 activation assay; single lab\",\n      \"pmids\": [\"40227532\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Dock4 promotes excitatory synaptic transmission in spinal cord neurons by promoting GluN2B expression at synaptic sites and synaptogenesis. Dock4 knockdown prevents dendritic growth, synaptogenesis, and the increase in GTP-Rac1 and GluN2B induced by spinal nerve ligation.\",\n      \"method\": \"Rac1 GTPase activation assay, Western blot, immunofluorescence, electrophysiology (patch-clamp), RNAi knockdown in dorsal spinal neurons\",\n      \"journal\": \"Frontiers in molecular neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RNAi knockdown with electrophysiology and defined molecular pathway (Rac1→GluN2B), single lab\",\n      \"pmids\": [\"39282658\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Loss-of-function variants in DOCK4 (missense and null) impair neurite outgrowth in Neuro-2A cells. Dock4 knockout Neuro-2A cells also exhibit defects in neurite outgrowth. Molecular modeling of missense variants suggests disruption of globular DOCK4 structure.\",\n      \"method\": \"In vitro functional expression in Neuro-2A cells, DOCK4 knockout Neuro-2A cells, molecular modeling\",\n      \"journal\": \"Human genetics\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — cell-based overexpression assay without full mechanistic pathway follow-up, single lab\",\n      \"pmids\": [\"38526744\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"DOCK4 is an unconventional guanine nucleotide exchange factor (GEF) of the DOCK180/CDM family that activates Rac1 and Rap1 GTPases; it is recruited to the plasma membrane via upstream signals including RhoG/ELMO, PIP3 binding through its DHR-1 domain, S1P, and receptor cytoplasmic domain interactions (e.g., SR-B1), where it drives actin cytoskeletal remodeling to regulate adherens junction formation, cell migration, LDL transcytosis, dendritic spine formation, excitatory synaptic transmission, and erythroid differentiation; DOCK4 also functions as a scaffold in the Wnt/β-catenin degradation complex and its activity is post-translationally regulated by GSK3β-mediated phosphorylation, USP36-mediated deubiquitination, and TBK1-mediated phosphorylation at S1787 (enabling CrkII engagement and Rap1 activation), while acting as a Dynein adaptor for Nav1.7 trafficking in sensory neurons.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"DOCK4 is an unconventional guanine nucleotide exchange factor of the DOCK180/CDM family that activates the small GTPases Rac1 and Rap1 to drive actin cytoskeletal remodeling across diverse cellular contexts, from adherens junction assembly to neuronal morphogenesis [#0, #1, #12]. It was first defined as a Rap1 activator that promotes adherens junction formation and behaves as a tumor suppressor, with a cancer-derived missense mutant defective in Rap1 activation and unable to rescue the engulfment defect of C. elegans ced-5 mutants [#0]. Membrane recruitment and activity are governed by multiple upstream inputs: active RhoG drives translocation of the DOCK4–ELMO complex to the plasma membrane to enhance Rac1 activation and migration [#1], the DHR-1 domain binds PIP3 [#5], and accessory partners SH3YL1 and CrkII potentiate GEF output [#7, #4]. In endothelial cells, DOCK4 is recruited by the cytoplasmic tail of the LDL receptor SR-B1 to couple LDL binding to Rac1 activation and LDL transcytosis [#11], and it maintains the endothelial barrier by balancing RhoA and Rac1 activity downstream of S1P [#18]. Beyond GEF activity, DOCK4 acts as a scaffold within the β-catenin degradation complex (APC/Axin/GSK3β), where GSK3β-mediated phosphorylation links DOCK4 to Wnt-induced Rac activation and β-catenin signaling [#3], and it serves as a Dynein adaptor that binds the Nav1.7 sodium channel to traffic it from the membrane in sensory neurons, thereby restraining heat nociception [#22]. In the nervous system, DOCK4 promotes dendritic growth, spine formation via cortactin, and excitatory synaptic transmission through Rac1-dependent control of glutamate receptor expression, and its conditional loss produces social deficits reversible by Rac1 or NMDA receptor restoration [#4, #6, #12]. DOCK4 protein levels are further controlled by USP36-mediated deubiquitination [#16], and site-specific phosphorylation at S1787 by TBK1 (scaffolded by THEMIS2) enables CrkII engagement and Rap1 activation [#23]. Disease-associated DOCK4 variants linked to autism spectrum disorder and dyslexia are deficient in Rac1/Rap1 activation and impair neurite outgrowth, spine formation, and synaptic transmission [#14].\",\n  \"teleology\": [\n    {\n      \"year\": 2003,\n      \"claim\": \"Established DOCK4 as a functional GEF, identifying Rap1 as its target and linking its activity to adherens junction formation and tumor suppression.\",\n      \"evidence\": \"GTPase activation assays, C. elegans ced-5 genetic rescue, soft agar and in vivo tumor invasion assays with a cancer-derived missense mutant\",\n      \"pmids\": [\"12628187\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of nucleotide exchange not resolved\", \"Relationship between Rap1 and Rac1 specificity left open\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Defined the upstream activation logic, showing RhoG/ELMO recruits DOCK4 to the membrane to drive Rac1-dependent migration, and identified a tissue-specific isoform and a candidate inner-ear partner.\",\n      \"evidence\": \"Co-IP, fluorescence localization, GST-PAK Rac1 pull-down, RNAi migration assay; yeast two-hybrid and isoform-specific immunostaining\",\n      \"pmids\": [\"17027967\", \"16464467\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Harmonin interaction by Y2H only, not validated in cells\", \"How RhoG engagement is itself triggered unaddressed\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Revealed dual roles beyond GEF activity: DOCK4 is a phosphorylated scaffold in the β-catenin degradation complex linking Wnt to Rac, binds PIP3 through its DHR-1 domain, and shapes dendritic morphology via ELMO2/CrkII.\",\n      \"evidence\": \"Co-IP, in vitro GSK3β kinase assay, zebrafish TCF reporter; PIP3-bead pull-down with deletion mutants; neuronal shRNA and morphometry\",\n      \"pmids\": [\"18641688\", \"18459162\", \"18615735\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Sites of GSK3β phosphorylation not mapped\", \"How scaffold versus GEF functions are coordinated unclear\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Connected DOCK4 GEF activity to a specific actin effector, showing cortactin binding is required for dendritic spine formation.\",\n      \"evidence\": \"shRNA, Co-IP, domain-deletion rescue, spine density quantification in cultured neurons\",\n      \"pmids\": [\"23536706\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether cortactin is a direct Rac1 effector downstream of DOCK4 not resolved\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Identified SH3YL1 as a phosphoinositide-binding cofactor that potentiates DOCK4-mediated Rac1 activation and migration.\",\n      \"evidence\": \"Co-IP, Rac1 activation assay, domain mutagenesis, shRNA migration assay in MDA-MB-231\",\n      \"pmids\": [\"24508479\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single cell line; in vivo relevance of SH3YL1 cofactor role untested\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Extended DOCK4 function to cancer metastasis and hematopoiesis, placing it downstream of TGF-β/Smad to drive invasion and showing it sustains erythroid differentiation through a RAC1→ADDUCIN→F-actin axis.\",\n      \"evidence\": \"Smad inhibitor epistasis, knockdown/overexpression, Rac1 assays, invasion and in vivo extravasation; siRNA, F-actin assay, RAC1 assay, rescue in MDS patient erythroblasts\",\n      \"pmids\": [\"25644601\", \"26578796\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of TGF-β/Smad-specific DOCK4 induction not detailed\", \"Direct kinase responsible for ADDUCIN phosphorylation not identified\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Showed a context-dependent tumor-suppressive output in glioblastoma, where DOCK4 drives a β-catenin/miR-302/cyclin D1 cascade to limit stem-like self-renewal.\",\n      \"evidence\": \"Overexpression, luciferase reporter, sphere-formation and tumorigenicity assays\",\n      \"pmids\": [\"28925399\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Reconciliation with pro-metastatic roles in other tumors unaddressed\", \"Whether GEF activity is required not tested\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Demonstrated receptor-coupled and circuit-level functions: SR-B1 recruits DOCK4 to drive LDL transcytosis, DOCK4 sustains CA1 excitatory transmission and social behavior via Rac1, and its loss in MDS HSCs perturbs LYN/SHIP1/SHP1 signaling.\",\n      \"evidence\": \"Co-IP and domain mapping with transcytosis and atherosclerosis models; conditional KO, electrophysiology, Rac1 and genetic/pharmacological rescue; phosphoproteomics and pharmacological rescue in MDS samples\",\n      \"pmids\": [\"31019307\", \"31388105\", \"31308061\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct vs indirect link between DOCK4 loss and LYN activation not fully resolved\", \"How Rac1 controls global protein synthesis mechanistically unclear\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Tied disease-associated DOCK4 variants to functional deficits, showing ASD/dyslexia alleles fail to activate Rac1/Rap1 and impair neuronal morphology and synaptic transmission.\",\n      \"evidence\": \"Rac1/Rap1 activation assays, cell morphology, neurite outgrowth, electrophysiology with disease variants\",\n      \"pmids\": [\"32009906\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No animal model carrying the patient variants\", \"Penetrance and genetic context of variants not established\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Identified DOCK4 protein stability and tissue-specific differentiation roles, with USP36 deubiquitinating DOCK4 to activate Wnt/β-catenin and DOCK4 controlling goblet cell differentiation via Gfi1/Spdef/MUC2.\",\n      \"evidence\": \"Co-IP and ubiquitination assays; Dock4 KO mice, siRNA, overexpression with qPCR/Western\",\n      \"pmids\": [\"33968925\", \"33559155\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"E3 ligase opposing USP36 not identified\", \"Whether goblet cell role requires GEF activity untested\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Established DOCK4 as a balancer of RhoA/Rac1 activity maintaining the endothelial barrier downstream of S1P and as a driver of cochlear hair cell maintenance via Rac1/β-catenin.\",\n      \"evidence\": \"DOCK4-deficient mice and reconstitution in endothelial cells, permeability, GTPase, fractionation, S1P assays; piggyBac knockdown mice with ABR and histology\",\n      \"pmids\": [\"35477279\", \"38933554\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How S1P signaling triggers DOCK4 translocation mechanistically unclear\", \"Hair cell findings rely on knockdown only\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Expanded the mechanistic repertoire with epithelial morphogenesis (HIF2α→Dock4→Rac1/Pak1→E-cadherin), brain metastasis via EGFR/DOCK4/Rac1-CDC42, and a non-GEF adaptor role bridging Dynein and Nav1.7 to control nociception.\",\n      \"evidence\": \"Knockdown and 3D cyst assays with Rac1/Pak1 readouts; shRNA brain extravasation with EGFR inhibitor; Co-IP, Nav1.7 trafficking assay, DRG knockdown in mice and primates, ChIP for H4K8 lactylation\",\n      \"pmids\": [\"38802496\", \"38762624\", \"40759894\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of the Dynein/DOCK4/Nav1.7 complex undefined\", \"How lactylation-driven DOCK4 repression integrates with GEF signaling unclear\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Defined a phospho-switch controlling DOCK4 Rap1 output, with THEMIS2 scaffolding TBK1 to phosphorylate S1787 and enable CrkII binding and Rap1 activation in cancer metastasis.\",\n      \"evidence\": \"IP-MS, site-specific mutagenesis, active Rap1 GST pull-down, in vitro/in vivo metastasis assays\",\n      \"pmids\": [\"40227532\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether S1787 phosphorylation also affects Rac1 activity untested\", \"Phosphatase reversing S1787 not identified\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How DOCK4 selects between Rac1 and Rap1 outputs, and how its scaffold, GEF, and Dynein-adaptor functions are integrated across cell types, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural model of DOCK4 GEF or adaptor complexes\", \"Determinants of Rac1- versus Rap1-directed activity not defined\", \"Context-dependent tumor-suppressive versus pro-metastatic switch unexplained\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 1, 8, 9, 11, 23]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 1, 11, 18]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [3, 22]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [5]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [6, 9]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [1, 11, 18]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [1]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [6, 9]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 1, 3, 11, 18]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [4, 6, 12, 24]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [8, 9, 13, 21, 23]},\n      {\"term_id\": \"R-HSA-1474244\", \"supporting_discovery_ids\": [0, 18, 20]},\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [11, 22]}\n    ],\n    \"complexes\": [\n      \"DOCK4-ELMO complex\",\n      \"\\u03b2-catenin degradation complex (APC/Axin/GSK3\\u03b2)\",\n      \"Dynein/DOCK4/Nav1.7 complex\"\n    ],\n    \"partners\": [\n      \"ELMO2\",\n      \"CRKII\",\n      \"SH3YL1\",\n      \"GSK3B\",\n      \"SR-B1\",\n      \"USP36\",\n      \"TBK1\",\n      \"Nav1.7\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}