| 2003 |
DOCK4 specifically activates Rap1 GTPase, enhancing 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 cancer-associated mutant does not |
GTPase activation assays, C. elegans genetic rescue, soft agar/invasion assays with wild-type vs. mutant DOCK4 |
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 the cytoplasm to the plasma membrane and enhances Dock4/ELMO-dependent Rac1 activation and cell migration; Dock4 knockdown in NIH3T3 cells reduces cell migration |
Co-immunoprecipitation, subcellular fractionation/imaging, Rac1 activation assay (GST-PAK pulldown), siRNA knockdown with migration assay |
Experimental cell research |
High |
17027967
|
| 2008 |
DOCK4 mediates Wnt-induced Rac activation in the canonical Wnt/β-catenin pathway by interacting 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, TCF reporter assay, zebrafish Wnt reporter model, β-catenin stability assays |
Oncogene |
High |
18641688
|
| 2008 |
Dock4 promotes dendritic growth and branching in hippocampal neurons via Rac activation; Dock4 forms a complex with ELMO2 and CrkII in hippocampal neurons; the C-terminal Crk-binding region of Dock4 is required for morphological effects; knockdown reduces dendritic growth and branching while overexpression with ELMO2 enhances it |
shRNA knockdown, overexpression, Co-immunoprecipitation, Rac activation assay, morphometric analysis of cultured hippocampal neurons |
Journal of neuroscience research |
High |
18615735
|
| 2006 |
A novel DOCK4 isoform (DOCK4-Ex49) is expressed in brain, eye, and inner ear; it localizes to stereocilia hair bundles in the inner ear; it binds nucleotide-free Rac and activates Rac as effectively as DOCK2; it interacts with the PDZ-domain protein harmonin (USH1C) identified by yeast two-hybrid |
Yeast two-hybrid, immunostaining with isoform-specific antibody, Rac binding/activation assay |
Journal of molecular biology |
Medium |
16464467
|
| 2008 |
DOCK4 and its splicing variant bind PIP3 through the DHR-1 domain, suggesting regulation of DOCK4 by phosphoinositides |
PIP3-analog bead binding assay, deletion mutant mapping |
IUBMB life |
Medium |
18459162
|
| 2013 |
Dock4 is concentrated in dendritic spines and promotes spine formation via interaction with the actin-binding protein cortactin; a GEF-deficient mutant and a mutant lacking the cortactin-binding region both fail to rescue spine density upon Dock4 knockdown; cortactin knockdown suppresses Dock4-mediated spine formation |
shRNA knockdown and rescue with domain mutants, Co-immunoprecipitation, confocal imaging, dendritic spine density quantification |
Molecular biology of the cell |
High |
23536706
|
| 2014 |
Dock4 forms a complex with SH3YL1 (a phosphoinositide-binding protein) via the C-terminal proline-rich region of Dock4; SH3YL1 interaction promotes Dock4-mediated Rac1 activation and cell migration; phosphoinositide-binding domain mutations in SH3YL1 disrupt its ability to promote Dock4-mediated migration; SH3YL1 depletion suppresses cell migration |
Co-immunoprecipitation, Rac1 activation assay, domain-mapping, siRNA knockdown, cell migration assay |
Cellular signalling |
Medium |
24508479
|
| 2015 |
TGF-β induces DOCK4 expression via the Smad pathway in lung adenocarcinoma cells; DOCK4 induction mediates TGF-β's pro-metastatic effects by enhancing tumor cell extravasation through Rac1 activation, without affecting EMT |
Smad pathway inhibition/activation, DOCK4 knockdown/overexpression, Rac1 activation assay, in vivo extravasation assays, cell motility/invasion assays |
Genes & development |
High |
25644601
|
| 2015 |
DOCK4 knockdown in primary marrow CD34+ stem cells leads to decreased erythroid colony formation and increased apoptosis; reduced DOCK4 leads to disruption of F-actin filament network in erythroblasts via decreased RAC1 GTPase activation, leading to increased phosphorylation of the actin-stabilizing protein ADDUCIN |
siRNA knockdown in primary CD34+ cells, erythroid colony assay, F-actin quantification, RAC1 activation assay, ADDUCIN phosphorylation western blot, DOCK4 re-expression in MDS patient erythroblasts |
Proceedings of the National Academy of Sciences of the United States of America |
High |
26578796
|
| 2017 |
DOCK4 promotes nuclear β-catenin accumulation in GBM progenitor cells via increased GSK3β activity in a feed-forward mechanism; nuclear β-catenin then induces miR-302 expression, which represses cyclin D1 and stemness features, resulting in anti-proliferative effects; DOCK4 overexpression suppresses self-renewal and tumorigenicity of GBM stem-like cells |
DOCK4 overexpression, GSK3β activity assay, β-catenin nuclear fractionation, miR-302 reporter, cyclin D1 western blot, neurosphere assay |
Oncogene |
Medium |
28925399
|
| 2019 |
SR-B1 recruits DOCK4 via an eight-amino-acid cytoplasmic domain of the receptor; DOCK4 promotes internalization of SR-B1 and LDL transcytosis across endothelial monolayers by coupling LDL binding to SR-B1 with activation of RAC1 |
Co-immunoprecipitation, domain mapping (SR-B1 cytoplasmic tail mutants), Rac1 activation assay, LDL transcytosis assay across endothelial monolayers, SR-B1/DOCK4 colocalization in vesicles in vivo |
Nature |
High |
31019307
|
| 2019 |
Dock4 deficiency in mice reduces Rac1 activity in hippocampus, causing downregulation of global protein synthesis and diminished AMPA and NMDA receptor subunit expression; conditional Dock4 deletion in CA1 neurons attenuates excitatory synaptic transmission and decreases spine density; Rac1 replenishment in CA1 restores synaptic transmission and corrects social deficits; NMDA receptor pharmacological activation also restores social novelty preference |
Dock4 KO and conditional KO mice, Rac1 activation assay, electrophysiology, spine density analysis, western blot for receptor subunits, viral Rac1 rescue, pharmacological NMDA activation |
Molecular psychiatry |
High |
31388105
|
| 2019 |
Reduced DOCK4 expression in hematopoietic stem cells leads to increased tyrosine phosphorylation of LYN kinase and phosphatases SHIP1 (INPP5D) and SHP1 (PTPN6); LYN kinase targets SHIP1 and SHP1 as substrates; these signaling alterations increase migration and impede HSC differentiation; pharmacological SHP1 inhibition reverses erythroid differentiation block in DOCK4-low/-7q MDS cells |
Phosphoproteomics, siRNA knockdown, kinase substrate assay, migration assay, erythroid differentiation assay, pharmacological inhibition |
Clinical cancer research |
Medium |
31308061
|
| 2020 |
Two DOCK4 variants (Exon27-52 deletion producing Dock4-945VS, and missense R853H) show decreased ability to activate both Rac1 and Rap1, are dysfunctional for cell morphology/cytoskeleton regulation, and have compromised function in promoting neurite outgrowth and dendritic spine formation; R853H partially loses ability to promote excitatory synaptic transmission while 945VS totally loses it |
GTPase activation assay (Rac1, Rap1), cell morphology analysis, neurite outgrowth assay in Neuro-2a cells and hippocampal neurons, spine density quantification, electrophysiological recordings |
Frontiers in cellular neuroscience |
High |
32009906
|
| 2020 |
DOCK4 overexpression increases cytotrophoblast (CTB) invasiveness, consistent with the placenta accreta spectrum (PAS) over-invasion phenotype; DOCK4 mRNA is the most highly upregulated molecule in PAS CTBs compared to normal depth-invading CTBs |
Global gene expression comparison, DOCK4 overexpression with invasion assay |
Proceedings of the National Academy of Sciences of the United States of America |
Medium |
32576693
|
| 2022 |
DOCK4 deficiency in mice causes pulmonary hemorrhage, incomplete smooth muscle coverage in pulmonary vessels, increased basal microvascular permeability, and impaired S1P-induced reversal of thrombin-induced permeability; DOCK4 rapidly translocates to the cell periphery (detergent-insoluble fraction) upon S1P treatment; DOCK4 absence prevents S1P-induced Rac1 activation; DOCK4-silenced cells exhibit enhanced RhoA activation; DOCK4 maintains AJs by balancing RhoA and Rac1 activity |
DOCK4-deficient mice (in vivo hemorrhage, permeability), DOCK4 silencing and reconstitution in HPAEC, subcellular fractionation, Rac1/RhoA activation assays, endothelial permeability assay |
Arteriosclerosis, thrombosis, and vascular biology |
High |
35477279
|
| 2022 |
Dock4 knockdown in cochlear hair cells causes hair bundle deficits, increased oxidative stress, and progressive HC apoptosis; mechanistically, Rac1/β-catenin signaling is downregulated in Dock4 KD cochleae, causing disorganized stereocilia and increased oxidative stress |
piggyBac transposon-mediated Dock4 KD mice, ABR/DPOAE hearing tests, hair bundle morphology, Rac1 and β-catenin western blot/immunofluorescence, oxidative stress markers, HC apoptosis assay |
Fundamental research |
Medium |
38933554
|
| 2024 |
Brain endothelial cells activate EGFR signaling in triple-negative breast cancer cells via soluble factors, and this activation occurs via DOCK4 (RAC1 GEF); DOCK4 is required for breast cancer cell extravasation to the brain in vivo; DOCK4 knockdown inhibits elongated morphology preceding intercalation into brain endothelium; DOCK4 and DOCK9 together mediate paracrine stimulation of mesenchymal-like morphology via RAC1 and CDC42 |
DOCK4 knockdown, in vivo brain extravasation assay, cell morphology analysis, EGFR inhibitor (Afatinib) experiments, RAC1/CDC42 activation assays |
Communications biology |
Medium |
38762624
|
| 2024 |
HIF2α functions in normoxia in kidney epithelial cells to induce Dock4/Rac1/Pak1 signaling, which mediates stability and compaction of E-cadherin at nascent adherens junctions; HIF2α- or Dock4-deficient cells show aberrant cyst morphogenesis in 3D cultures |
HIF2α and Dock4 siRNA knockdown, Rac1/Pak1 activation assays, E-cadherin localization imaging, 3D cyst morphogenesis assay |
Scientific reports |
Medium |
38802496
|
| 2024 |
Dock4 in dorsal root ganglion neurons interacts with Nav1.7 and mediates its trafficking from the membrane to the cytoplasm; Dock4 acts as an adaptor binding the motor protein Dynein to form a Dynein/DOCK4/Nav1.7 complex, where Dynein provides mechanical force for Nav1.7 trafficking; DOCK4 expression in DRG neurons is regulated by histone H4K8 lactylation; DOCK4 deficiency increases heat nociception |
Co-immunoprecipitation, proximity ligation assay, Nav1.7 trafficking assay, Dock4 KD in DRG (mice and nonhuman primates), histone lactylation ChIP, nociception behavioral assays |
Nature communications |
High |
40759894
|
| 2024 |
Heterozygous loss-of-function missense variants in DOCK4 impair neurite outgrowth in Neuro-2A cells; Dock4 knockout Neuro-2A cells also exhibit defects in neurite outgrowth; molecular modeling suggests missense variants affect the globular structure of DOCK4 |
In vitro functional expression of DOCK4 variants in Neuro-2A cells (neurite outgrowth assay), Dock4 KO cells, molecular modeling |
Human genetics |
Medium |
38526744
|
| 2025 |
THEMIS2 acts as a molecular scaffold that recruits TBK1 to DOCK4, facilitating phosphorylation of DOCK4 at serine 1787 (S1787); this post-translational modification enables DOCK4 to engage with CRKII, subsequently triggering Rap1 signaling activation and promoting ovarian cancer metastasis |
Immunoprecipitation-mass spectrometry, GST pull-down assay for active Rap1 (Rap1-GTP), co-immunoprecipitation, phospho-site mapping, wound healing and invasion assays, in vivo metastasis model |
Cellular oncology |
Medium |
40227532
|
| 2024 |
Dock4 facilitates excitatory synaptic transmission in spinal dorsal horn neurons by promoting GluN2B expression at the synaptic site and synaptogenesis; Dock4 knockdown prevents dendritic growth, synaptogenesis, and increased excitatory postsynaptic currents in a spinal nerve ligation neuropathic pain model |
Dock4 RNAi knockdown, whole-cell patch clamp electrophysiology in spinal cord slices, GluN2B immunofluorescence/western blot, Rac1 activation assay, dendritic spine analysis in cultured dorsal spinal neurons |
Frontiers in molecular neuroscience |
Medium |
39282658
|
| 2021 |
USP36 directly binds DOCK4 and mediates its deubiquitination, thereby stabilizing DOCK4; stabilized DOCK4 activates Wnt/β-catenin signaling and promotes EMT in diabetic renal tubular epithelial cells |
Co-immunoprecipitation, ubiquitination assay, USP36 overexpression/knockdown with DOCK4 stability readout, EMT marker western blot |
Frontiers in cell and developmental biology |
Medium |
33968925
|