| 2003 |
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. |
GTPase activation assays, C. elegans genetic rescue, soft agar colony formation and in vivo tumor invasion assays |
Cell |
High |
12628187
|
| 2006 |
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. |
Co-immunoprecipitation, fluorescence localization, Rac1 GTPase activation assay (GST-PAK pull-down), RNAi knockdown with migration assay |
Experimental cell research |
Medium |
17027967
|
| 2006 |
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. |
Yeast two-hybrid, immunostaining with isoform-specific antibody, Rac nucleotide-free binding assay |
Journal of molecular biology |
Medium |
16464467
|
| 2008 |
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. |
Co-immunoprecipitation, in vitro kinase assay, β-catenin stability assay, TCF reporter assay in zebrafish |
Oncogene |
High |
18641688
|
| 2008 |
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. |
shRNA knockdown, overexpression, co-immunoprecipitation in neurons, dendritic morphometry |
Journal of neuroscience research |
Medium |
18615735
|
| 2008 |
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. |
PIP3-analog bead pull-down assay with deletion mutants |
IUBMB life |
Medium |
18459162
|
| 2013 |
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. |
shRNA knockdown, co-immunoprecipitation, domain-deletion rescue experiments, spine density quantification in cultured neurons |
Molecular biology of the cell |
Medium |
23536706
|
| 2014 |
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. |
Co-immunoprecipitation, Rac1 GTPase activation assay, domain mutant analysis, shRNA knockdown with migration assay |
Cellular signalling |
Medium |
24508479
|
| 2015 |
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. |
Smad pathway inhibitor experiments, DOCK4 knockdown/overexpression, Rac1 GTPase activation assay, invasion/migration assays, in vivo extravasation model |
Genes & development |
Medium |
25644601
|
| 2015 |
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. |
siRNA knockdown, F-actin single-cell assay, RAC1 GTPase activation assay, re-expression rescue in MDS patient erythroblasts |
Proceedings of the National Academy of Sciences of the United States of America |
High |
26578796
|
| 2017 |
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. |
Overexpression, luciferase reporter, Western blot, sphere-formation and tumorigenicity assays |
Oncogene |
Medium |
28925399
|
| 2019 |
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. |
Co-immunoprecipitation, domain deletion mutagenesis, transcytosis assay across endothelial monolayers, in vivo mouse atherosclerosis model with SR-B1/DOCK4 manipulation |
Nature |
High |
31019307
|
| 2019 |
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. |
Conditional Dock4 knockout, Rac1 activity assay, electrophysiology, Western blot for receptor subunits, viral Rac1 rescue, pharmacological rescue |
Molecular psychiatry |
High |
31388105
|
| 2019 |
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. |
Phosphoproteomics, siRNA knockdown, kinase-substrate assay, pharmacological rescue in primary human HSCs and MDS patient samples |
Clinical cancer research |
Medium |
31308061
|
| 2020 |
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. |
GTPase activation assay (Rac1 and Rap1), cell morphology analysis, neurite outgrowth assay in Neuro-2a and hippocampal neurons, electrophysiology |
Frontiers in cellular neuroscience |
Medium |
32009906
|
| 2020 |
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. |
DOCK4 overexpression in CTB cells with invasion assay |
Proceedings of the National Academy of Sciences of the United States of America |
Low |
32576693
|
| 2021 |
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. |
Co-immunoprecipitation, ubiquitination assay, overexpression/knockdown with Western blot and EMT marker analysis |
Frontiers in cell and developmental biology |
Medium |
33968925
|
| 2021 |
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. |
Dock4 knockout mice, siRNA knockdown, overexpression in HT-29 cells, qPCR and Western blot |
Journal of cellular physiology |
Medium |
33559155
|
| 2022 |
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. |
DOCK4-deficient mice, DOCK4 silencing/reconstitution in human pulmonary artery endothelial cells, permeability assay, GTPase activation assays, subcellular fractionation, S1P treatment |
Arteriosclerosis, thrombosis, and vascular biology |
High |
35477279
|
| 2022 |
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. |
piggyBac transposon knockdown mice, auditory brainstem response, immunofluorescence, Western blot |
Fundamental research |
Medium |
38933554
|
| 2024 |
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. |
HIF2α and Dock4 knockdown/depletion, E-cadherin localization assay, 3D cyst morphogenesis assay, Rac1/Pak1 activity assays |
Scientific reports |
Medium |
38802496
|
| 2024 |
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. |
DOCK4 shRNA knockdown, in vivo brain extravasation assay, EGFR inhibitor (Afatinib), cell morphology analysis |
Communications biology |
Medium |
38762624
|
| 2024 |
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. |
Co-immunoprecipitation, Nav1.7 trafficking assay, DRG-specific Dock4 knockdown in mice and non-human primates, heat nociception behavioral tests, ChIP for H4K8 lactylation |
Nature communications |
High |
40759894
|
| 2025 |
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. |
Immunoprecipitation-mass spectrometry, GST pull-down for active Rap1, site-specific mutagenesis, in vitro and in vivo metastasis assays |
Cellular oncology |
Medium |
40227532
|
| 2024 |
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. |
Rac1 GTPase activation assay, Western blot, immunofluorescence, electrophysiology (patch-clamp), RNAi knockdown in dorsal spinal neurons |
Frontiers in molecular neuroscience |
Medium |
39282658
|
| 2024 |
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. |
In vitro functional expression in Neuro-2A cells, DOCK4 knockout Neuro-2A cells, molecular modeling |
Human genetics |
Low |
38526744
|