{"gene":"DOCK8","run_date":"2026-06-09T23:54:42","timeline":{"discoveries":[{"year":2004,"finding":"DOCK8 was identified in a yeast two-hybrid screen as a Cdc42-interacting protein with similarity to DOCK180. Immunofluorescence showed that HA-tagged and endogenous DOCK8 localizes to cell edges at sites of lamellipodia formation. Transfection of a C-terminal fragment caused formation of vesicular structures containing filamentous actin, implicating DOCK8 in regulation of filamentous actin organization.","method":"Yeast two-hybrid screen, immunofluorescence, transient transfection","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — initial identification and localization by yeast two-hybrid and immunofluorescence, two orthogonal methods, single lab","pmids":["15304341"],"is_preprint":false},{"year":2009,"finding":"DOCK8 mutations in mice abolish formation of marginal zone B cells and germinal center B cell persistence, preventing affinity maturation. DOCK8 mutations specifically disrupted accumulation of the integrin ligand ICAM-1 in the B cell immunological synapse but did not alter other aspects of B cell antigen receptor signaling.","method":"Mouse genetic screen (ENU mutagenesis), loss-of-function mouse model, immunological synapse imaging, flow cytometry","journal":"Nature immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — two independent DOCK8 mutant mouse lines, multiple orthogonal readouts (germinal center formation, marginal zone B cells, immunological synapse imaging), replicated across two mutants","pmids":["19898472"],"is_preprint":false},{"year":2012,"finding":"DOCK8 is a Cdc42-specific guanine nucleotide exchange factor (GEF) required for interstitial dendritic cell migration. DOCK8-deficient DCs failed to accumulate in lymph node parenchyma, could not crawl in 3D fibrillar networks or transmigrate through the subcapsular sinus floor, but migrated normally on 2D surfaces. This function depended on the DHR-2 domain mediating Cdc42 activation. Spatial Cdc42 activation at the leading edge membrane (not global Cdc42 activity) was impaired in DOCK8-deficient DCs.","method":"DOCK8 knockout mice, 2D and 3D migration assays, domain mutant rescue experiments, Cdc42 activity assays (global and spatially resolved)","journal":"Blood","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — knockout mice plus DHR-2 domain mutant rescue plus spatial GTPase activity assay, multiple orthogonal methods in one study","pmids":["22461490"],"is_preprint":false},{"year":2012,"finding":"DOCK8 functions as an adaptor in TLR9-MyD88 signaling in B cells. DOCK8 constitutively associates with MyD88 and the tyrosine kinase Pyk2. After TLR9 ligation, DOCK8 is tyrosine-phosphorylated by Pyk2, then binds the Src-family kinase Lyn, linking TLR9 to a Src-Syk-STAT3 cascade essential for TLR9-driven B cell proliferation and differentiation. TLR9-driven B cell activation was impaired in DOCK8-deficient patients, while CD40-driven activation was not.","method":"Co-immunoprecipitation, phosphorylation assays, DOCK8-deficient patient B cells, selective functional assays (TLR9 vs CD40 stimulation)","journal":"Nature immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP establishing the DOCK8-MyD88-Pyk2-Lyn complex, patient cells with selective TLR9 vs CD40 defect providing pathway placement, multiple orthogonal methods","pmids":["22581261"],"is_preprint":false},{"year":2011,"finding":"DOCK8 is required cell-autonomously for peripheral CD8 T cell survival and function. DOCK8 mutation diminished naive CD8 T cell abundance, shortened naive CD8 T cell lifespan, impaired LFA-1 synaptic polarization upon DC encounter, delayed first cell division, and greatly reduced memory cell persistence after infection. These defects were established as postthymic and cell-autonomous in both mice and humans.","method":"DOCK8-mutant mice and human patient cells, cell transfer experiments (cell autonomy), in vivo influenza infection, LFA-1 polarization imaging, lifespan analysis","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — cell-autonomous defect shown by transfer experiments, replicated in both mouse and human, multiple functional readouts","pmids":["22006977"],"is_preprint":false},{"year":2011,"finding":"DOCK8 deficiency in mice causes T cell lymphopenia with increased T cell turnover and decreased survival. Egress of mature CD4+ thymocytes is reduced with increased migration toward CXCL12. DOCK8 is limiting specifically for the survival of CD8+ memory T cells after viral infection, not for the primary CD8 response.","method":"DOCK8-deficient mouse analysis, flow cytometry, chemokine migration assays, influenza infection model","journal":"European journal of immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO mouse model with multiple immune phenotypes measured, replicated findings consistent with parallel human study (PMID 22006977)","pmids":["21969276"],"is_preprint":false},{"year":2014,"finding":"DOCK8, through CDC42 and p21-activated kinase (PAK), coordinates cytoskeletal structures during lymphocyte migration through confined, collagen-dense spaces. DOCK8-deficient T and NK cells develop cell shape and nuclear deformation abnormalities leading to cytothripsis (migration-induced catastrophic cell death) without impairing chemotaxis. This prevents generation of long-lived skin-resident memory CD8 T cells and impairs herpesvirus skin infection control.","method":"DOCK8-deficient patient and mouse cells, live imaging of lymphocyte migration through confined spaces, collagen matrix migration assays, in vivo herpesvirus skin infection model, resident memory T cell quantification","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — mechanism identified via live imaging in both patient and mouse cells, in vivo infection model, CDC42-PAK pathway placement by genetic evidence","pmids":["25422492"],"is_preprint":false},{"year":2016,"finding":"DOCK8 bridges WASp-interacting protein (WIP) to WASp and actin in T cells, forming a DOCK8-WIP-WASp complex. The GEF activity of DOCK8 is essential for subcortical actin cytoskeleton integrity, TCR-driven WASp activation, F-actin assembly, immune synapse formation, actin foci formation, mechanotransduction, T cell transendothelial migration, and homing to lymph nodes — all of which also depend on WASp, placing DOCK8 and WASp in the same TCR-to-actin signaling pathway.","method":"Co-immunoprecipitation, DOCK8-deficient patient T cells, GEF-dead mutant rescue, actin assembly assays, immune synapse imaging, transendothelial migration assay, in vivo lymph node homing","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP establishing complex, GEF-dead mutant rescue experiments, patient cells, multiple orthogonal functional assays in one study","pmids":["27599296"],"is_preprint":false},{"year":2013,"finding":"DOCK8 deficiency impairs NKT cell development, specifically affecting formation and survival of long-lived, differentiated NK1.1+ NKT cells expressing CD103 in the thymus. DOCK8-deficient NKT cells in the liver express reduced levels of the prosurvival factor Bcl-2 and LFA-1. Initial NKT cell response to antigen is intact but ongoing proliferative and cytokine responses are impaired.","method":"DOCK8-deficient mouse model, flow cytometry (thymic and hepatic NKT cell subsets), Bcl-2 expression analysis, antigen response assays, validation in DOCK8-deficient humans","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Strong — mouse KO model with multiple cell subset analyses, replicated in human DOCK8-deficient patients, multiple orthogonal readouts","pmids":["23929855"],"is_preprint":false},{"year":2015,"finding":"DOCK8 is absolutely required for dendritic cell migration during immune responses. Coincidental loss of DOCK8 in NLRP10-deficient mice (due to an unexpected Dock8 mutation) was shown by whole-exome sequencing and confirmed by targeted deletion: isolated DOCK8 deficiency recapitulates the DC migration defect. C3H/HeJ mice also harbor a Dock8 mutation that partially impairs DC migration.","method":"Proteomic screen, whole-exome sequencing, targeted Dock8 deletion, in vivo DC migration assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — causal role confirmed by targeted deletion after discovery via proteomics and sequencing; DC migration phenotype independently replicated","pmids":["25713392"],"is_preprint":false},{"year":2016,"finding":"DOCK8 is a Cdc42-specific GEF required for macrophage migration in a 2D setting. The GEF activity of DOCK8 (not merely protein scaffolding) is required for macrophage migration. DOCK8 associates with LRAP35a, an adaptor that binds the Cdc42 effector MRCK, and facilitates MRCK phosphorylation of myosin II regulatory light chain. Disrupting the DOCK8-LRAP35a interaction in WT macrophages recapitulates the DOCK8-deficient migration defect.","method":"DOCK8-deficient macrophages, GEF-activity rescue experiments, co-immunoprecipitation, LRAP35a interaction-disruption experiments, myosin RLC phosphorylation assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — GEF activity requirement shown by rescue, DOCK8-LRAP35a interaction identified by Co-IP and disruption experiments, multiple methods in single lab","pmids":["28028174"],"is_preprint":false},{"year":2017,"finding":"LRCH1 competes with Cdc42 for interaction with DOCK8, restraining T cell migration. In response to chemokine stimulation, PKCα phosphorylates DOCK8 at three serine sites, promoting DOCK8 separation from LRCH1 and translocation to the leading edge to guide T cell migration. Point mutations at DOCK8 serine sites block chemokine- and PKCα-induced T cell migration.","method":"Two screening systems (protein interaction screens), competition binding assays, PKCα phosphorylation assays, site-directed mutagenesis of DOCK8 serine sites, Dock8-mutant and Lrch1-transgenic/knockout mouse EAE models","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — biochemical competition assay, mutagenesis of phosphorylation sites with functional consequence, in vivo mouse disease model validation","pmids":["28028151"],"is_preprint":false},{"year":2017,"finding":"DOCK8 is a negative regulator of nuclear translocation of the transcription factor EPAS1 in CD4+ T cells, acting as an adaptor. In DOCK8-deficient CD4+ T cells, EPAS1 translocates to the nucleus and drives IL-31 expression by activating the Il31 promoter in collaboration with SP1 (not ARNT). IL-31 induction drives atopic skin inflammation. Conditional deletion of EPAS1 in CD4+ T cells abrogates skin disease in DOCK8-deficient mice.","method":"DOCK8-deficient mouse model, conditional EPAS1 deletion, IL-31 production assays, promoter activation assays, nuclear translocation imaging","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — DOCK8 shown as adaptor/negative regulator of EPAS1 nuclear translocation; conditional gene deletion rescue confirming pathway; multiple orthogonal methods","pmids":["28067314"],"is_preprint":false},{"year":2017,"finding":"DOCK8 regulates Treg fitness and function via IL-2 signaling in a STAT5-dependent manner. Treg-specific DOCK8 deletion caused spontaneous multiorgan inflammation. DOCK8-deficient Tregs are defective in competitive fitness and in vivo suppressive function. DOCK8 controls IL-2-driven STAT5 phosphorylation in Tregs.","method":"Conditional Treg-specific DOCK8 knockout mice, STAT5 phosphorylation assays, competitive fitness assays, in vivo suppression assays","journal":"JCI insight","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional knockout with Treg-specific phenotype, biochemical STAT5 phosphorylation assay, in vivo suppression, multiple orthogonal methods","pmids":["28978795"],"is_preprint":false},{"year":2017,"finding":"DOCK8 associates with STAT5 and is required for IL-2-driven STAT5 phosphorylation in Tregs. DOCK8 localizes within the lamellar actin ring of the Treg immune synapse (IS). DOCK8-deficient Tregs have abnormal TCR-driven actin dynamics, decreased adhesiveness, an unstable IS with decreased recruitment of signaling molecules, and impaired transendocytosis of CD86. Mice with selective DOCK8 deficiency in Tregs develop lymphoproliferation, autoantibodies, and gastrointestinal inflammation.","method":"DOCK8-Treg conditional knockout mice, Co-IP (DOCK8-STAT5 association), STAT5 phosphorylation assays, IS imaging, actin dynamics assays, CD86 transendocytosis assay","journal":"JCI insight","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP establishing DOCK8-STAT5 interaction, conditional KO phenotype, biochemical signaling and IS imaging, multiple orthogonal methods","pmids":["28978806"],"is_preprint":false},{"year":2017,"finding":"DOCK8 regulates NK cell cytotoxicity and cytokine production via Src family kinase (particularly Lck) activation downstream of target cell engagement or NKp30 ligation. Genetic ablation of DOCK8 in human NK cells attenuated cytokine transcription and secretion through inhibition of Src family kinase activation. PMA/ionomycin rescued cytokine production in DOCK8-deficient NK cells, indicating the defect is proximal to receptor ligation.","method":"DOCK8 knockdown in human NK cells, DOCK8-deficient patient NK cells, cytokine production assays, Src/Lck kinase activation assays, PMA/ionomycin rescue experiments","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic ablation in human cells plus patient validation, biochemical pathway placement via Src kinase assays, rescue experiment, multiple orthogonal methods","pmids":["28794229"],"is_preprint":false},{"year":2016,"finding":"DOCK8 interacts with Nck1 via its unique N-terminal proline-rich motif binding the SH3 domain of Nck1 to promote PDGF-induced Schwann cell precursor migration. Knockdown of Dock8 or Nck1 markedly decreased PDGF-induced cell migration and Rho GTPase activation. Reintroduction of a proline-rich motif mutant of Dock8 failed to restore migration, while wild-type Dock8 restored it.","method":"siRNA knockdown, Co-IP/pulldown (proline-rich motif – SH3 interaction), domain mutant rescue, cell migration assays, Rho GTPase activation assays","journal":"Biochemistry and biophysics reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — domain mutant rescue plus Co-IP and functional migration/GTPase assays, single lab","pmids":["28955869"],"is_preprint":false},{"year":2018,"finding":"DOCK8 regulates BCR signaling by controlling cd19 transcription via WASP. DOCK8-deficient B cells show reduced total WASP protein and reduced WASP activation; since WASP positively regulates CD19 transcription, reduced DOCK8 leads to decreased CD19 and impaired upstream BCR signaling (pCD19 and pBtk). DOCK8 deficiency disrupts early activation of memory B cells, including reduced BCR clustering, B cell spreading, and signalosome recruitment.","method":"DOCK8 knockout mouse model, DOCK8-deficient patient PBMCs, confocal microscopy, TIRF microscopy, BCR signaling assays (pCD19, pBtk), WASP expression and activation assays","journal":"Blood advances","confidence":"High","confidence_rationale":"Tier 2 / Strong — mouse KO plus human patient validation, multiple imaging modalities and biochemical signaling readouts, mechanistic pathway established","pmids":["29472447"],"is_preprint":false},{"year":2019,"finding":"DOCK8 is expressed in microglia and its expression increases during neuroinflammation. DOCK8-deficient mice exhibit reduced microglial migration through retinal layers in a model of MS/optic neuritis, and reduced severity of neuroinflammation. In a glaucoma model, DOCK8-deficient mice show impaired microglial phagocytosis of retinal ganglion cells.","method":"DOCK8-deficient mice, retinal immunofluorescence, disease models (optic neuritis and glaucoma), microglial migration and phagocytosis assays","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO model with two independent disease models and multiple cellular readouts, single lab","pmids":["31337702"],"is_preprint":false},{"year":2020,"finding":"DOCK8-deficient CX3CR1+ mononuclear phagocytes are exquisitely sensitive to migration-induced cell shattering, releasing IL-1β. This IL-1β drives GM-CSF production by CD4+ T cells, resulting in a TH2 cell bias. Blocking IL-1β, GM-CSF, or caspase activation eliminated the type-2 skew in Dock8-/- mice.","method":"Dock8-/- mice, Cryptococcus neoformans pulmonary infection model, IL-1β and GM-CSF blocking experiments, caspase inhibition, apoptotic cell transfer experiments","journal":"Nature immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple genetic and pharmacological interventions (IL-1β block, GM-CSF block, caspase inhibition) each independently confirmed the pathway; published in high-impact journal with rigorous controls","pmids":["33020661"],"is_preprint":false},{"year":2020,"finding":"DOCK8 is essential for LFA-1-dependent positioning of T follicular helper (Tfh) cells in germinal centers. Mice with T cell-selective DOCK8 deficiency had impaired IgG responses to T cell-dependent antigens, decreased GC size, and reduced GC B cells, despite normal Tfh numbers. Migration of DOCK8-deficient T cells into GCs was defective. Following TCR/CD3 ligation, DOCK8-deficient T cells showed impaired LFA-1 activation and reduced ICAM-1 binding.","method":"T cell-selective DOCK8 knockout mice, in vivo GC analysis, DOCK8-deficient T cell-B cell co-culture, LFA-1 activation assays, ICAM-1 binding assays, intravital imaging","journal":"JCI insight","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO with multiple in vivo phenotypes, biochemical LFA-1 activation assay, ICAM-1 binding, and mechanistic pathway established in one study","pmids":["32573493"],"is_preprint":false},{"year":2021,"finding":"The DHR-1 domain of DOCK8 binds specifically to phosphatidylinositol 4,5-bisphosphate (PI(4,5)P2) and is required for DOCK8 recruitment to the plasma membrane. Crystal structure and biochemical analyses revealed a C2 domain-like core with a pocket containing three basic residues for stereospecific phosphoinositide recognition. Substitution of K576 and R581 with alanine abolished PI(4,5)P2 binding in vitro, ablated Cdc42 activation, and impaired leukocyte migration in 3D collagen gels. Dendritic cells carrying the mutation exhibited defective interstitial migration in vivo.","method":"Crystal structure of DHR-1 domain, in vitro phosphoinositide binding assays, site-directed mutagenesis (K576A/R581A), 3D migration assays, in vivo DC migration assay","journal":"Life science alliance","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure plus mutagenesis plus in vitro binding assay plus in vivo functional validation, multiple orthogonal methods in one study","pmids":["33574036"],"is_preprint":false},{"year":2021,"finding":"DOCK8 deficiency in Tregs increases susceptibility to allergic skin inflammation and eczema. DOCK8 is important for Treg stability at sites of allergic inflammation and for generation, survival, and suppressive activity of inducible Tregs. Adoptive transfer of WT but not DOCK8-deficient OVA-specific inducible Tregs suppressed allergic inflammation in sensitized Dock8-/- mice. Cutaneous Staphylococcus aureus exposure in DOCK8-deficient mice caused severe allergic inflammation and elevated IgE attenuated by WT Treg transfer.","method":"Dock8-/- mice, Treg-specific inducible Dock8 deletion, epicutaneous OVA sensitization model, S. aureus topical exposure model, adoptive Treg transfer, skin biopsy histology and gene expression","journal":"The Journal of allergy and clinical immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — Treg-specific conditional KO plus adoptive transfer rescue plus two independent skin inflammation models, multiple orthogonal methods","pmids":["38185418"],"is_preprint":false},{"year":2014,"finding":"DOCK8 deficiency impairs RORγt+ ILC survival and function. DOCK8-deficient RORγt+ ILCs are less responsive to IL-7-mediated signaling, more prone to apoptosis, produce less IL-22, and have defective IL-23-mediated STAT3 phosphorylation. DOCK8 deficiency leads to susceptibility to Citrobacter rodentium infection associated with impaired antimicrobial peptide induction in the colon.","method":"Dock8-deficient mice, Citrobacter rodentium infection model, RNA-seq, IL-7 signaling assays, STAT3 phosphorylation assays, apoptosis assays","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — KO mouse model, in vivo infection, biochemical signaling assays (STAT3 phosphorylation), RNA-seq, multiple orthogonal methods","pmids":["25091235"],"is_preprint":false},{"year":2015,"finding":"DOCK8 deficiency in CD147-overexpressing hepatocellular carcinoma cells: CD147 upregulates pY416-Src via FAK, Src promotes STAT3 phosphorylation, STAT3 facilitates DOCK8 transcription enhancing DOCK8 expression, and DOCK8 acts as a GEF for Rac1 to drive mesenchymal-type cell movement.","method":"Confocal microscopy, Rac1 activity assay, Src/STAT3 phosphorylation assays, DOCK8 overexpression/knockdown, transcription assays","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple biochemical assays in one lab establishing CD147→FAK→Src→STAT3→DOCK8→Rac1 pathway, single lab","pmids":["25428919"],"is_preprint":false},{"year":2021,"finding":"DOCK8 deficiency causes a skewing to type 2 immunity in the gut with expansion of ILC2s. Intestinal ILC2 expansion occurs when DOCK8 expression is deleted in hematopoietic cells. Mice carrying mutations in the catalytic center of DOCK8 (DOCK8VAGR, failing to activate Cdc42) also show intestinal ILC2 expansion, indicating that DOCK8 negatively regulates intestinal ILC2s via Cdc42 activation.","method":"Dock8-/- mice, hematopoietic-specific Dock8 deletion, DOCK8 catalytic mutant (VAGR) mice, CyTOF high-dimensional phenotyping, ILC2 quantification","journal":"Biochemical and biophysical research communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — catalytic mutant mouse plus hematopoietic-specific deletion plus CyTOF phenotyping, GEF activity requirement established mechanistically","pmids":["33940384"],"is_preprint":false},{"year":2023,"finding":"DOCK8 is required for the metabolic fitness and long-term survival of IgA+ plasma cells in the gut lamina propria. B cell-intrinsic DOCK8 is required for maintenance of antigen-specific IgA-secreting plasma cells. DOCK8 deficiency is not required for early B cell activation, migration, or IgA class switching. An interactome screen revealed DOCK8 protein partners involved in metabolism and apoptosis; Dock8-deficient IgA+ B cells have impaired cellular respiration and fail to engage glycolysis appropriately.","method":"Dock8-deficient mice, B cell-specific deletion, immunization and infection models, unbiased interactome screen (mass spectrometry), cellular respiration and glycolysis assays (Seahorse)","journal":"Mucosal immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — B cell-specific conditional KO, interactome screen with MS, bioenergetics assays, multiple orthogonal methods in one study","pmids":["38159726"],"is_preprint":false},{"year":2025,"finding":"DOCK8-deficient activated T cells lack a central pool of F-actin that is present in wild-type murine and human T cells. This central actin pool is mechanosensitive and forms only under confinement. Loss of the central actin pool in Dock8-deficient T cells results in greater nuclear deformation, DNA damage accrual, and premature cell senescence. Mst1 kinase was identified as a necessary component of this mechanosensitive pathway alongside DOCK8.","method":"Dock8 knockout mice, human patient T cells, confocal and live imaging of F-actin under confinement, DNA damage assays, cell senescence assays, Mst1 genetic analysis","journal":"Science immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — KO mouse plus human patient validation, live imaging of mechanosensitive actin pool, DNA damage and senescence readouts, Mst1 pathway component identified","pmids":["40570086"],"is_preprint":false},{"year":2016,"finding":"DOCK8 interacts with septin 7 and integrin-linked kinase (ILK) in primary blood-derived lymphocytes as identified by interaction proteomics. In equine recurrent uveitis (autoimmune disease model), DOCK8 expression and its interaction network are significantly altered.","method":"Interaction proteomics (Co-IP + mass spectrometry), flow cytometry for expression, equine autoimmune uveitis model","journal":"Scientific reports","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single-lab pulldown/MS without functional follow-up of the specific interactions; disease model is equine, not standard mammalian model for DOCK8","pmids":["30120291"],"is_preprint":false},{"year":2020,"finding":"DOCK8 expression in Tregs limits contact hypersensitivity by promoting Treg stability and fitness in inflamed skin. Lack of DOCK8 in Tregs resulted in their acquisition of a pathogenic FOXP3+T-bet+IFNγ+ phenotype at CHS sites and promoted conversion into ex-Tregs. Transfer of Dock8-/- Tregs increased the CHS response of WT recipients, while WT Tregs suppressed it.","method":"Dock8-/- mice, T cell- and Treg-specific DOCK8 knockout, oxazolone CHS model, oral tolerance assays, Treg transfer experiments, flow cytometry phenotyping","journal":"The Journal of investigative dermatology","confidence":"High","confidence_rationale":"Tier 2 / Strong — Treg-specific KO plus adoptive transfer experiments in both directions plus in vivo disease model, multiple orthogonal methods","pmids":["33171169"],"is_preprint":false},{"year":2024,"finding":"DOCK8 mutation (exon 45, c.5846C>A) generated by CRISPR/Cas9 in mice inhibits splenic MZ and GC B cell development and cripples BCR signaling. The reduced BCR signaling was related to decreased B cell spreading, BCR clustering, and signalosomes, mediated by inhibited activation of WASP. Additionally, DOCK8 mutation led to increased c-Myc expression in B cells, enhancing glycolysis.","method":"CRISPR/Cas9 knock-in mouse model (patient-derived point mutation), flow cytometry, BCR signaling assays, confocal/TIRF microscopy, WASP activation assays, metabolic (glycolysis) assays","journal":"Cell death & disease","confidence":"High","confidence_rationale":"Tier 2 / Strong — patient-derived CRISPR knock-in model, multiple orthogonal methods (imaging, signaling, metabolic assays), mechanistic pathway established","pmids":["39616183"],"is_preprint":false}],"current_model":"DOCK8 is a Cdc42-specific (and context-dependent Rac1) guanine nucleotide exchange factor that operates through its DHR-2 catalytic domain and is recruited to the plasma membrane via PI(4,5)P2 binding by its DHR-1 domain; it organizes a mechanosensitive central F-actin pool in lymphocytes to maintain cell shape integrity during confined migration, links TCRs and BCRs to the actin cytoskeleton through a DOCK8–WIP–WASp complex, acts as a signaling adaptor connecting TLR9–MyD88 to a Pyk2–Lyn–Syk–STAT3 cascade in B cells, controls STAT5 phosphorylation downstream of IL-2 in Tregs, negatively regulates nuclear translocation of EPAS1 in CD4+ T cells to suppress IL-31 production, drives NK cell effector function through Src/Lck kinase activation, and is regulated by PKCα-mediated phosphorylation that releases it from LRCH1 to allow leading-edge Cdc42 activation during directional T cell migration."},"narrative":{"mechanistic_narrative":"DOCK8 is a Cdc42-specific guanine nucleotide exchange factor that couples receptor and chemokine signals to actin-cytoskeletal remodeling, and it is essential for the survival, migration, and effector function of multiple leukocyte lineages [PMID:22461490, PMID:25422492]. Catalysis is mediated by its DHR-2 domain, which activates Cdc42 at the leading-edge membrane, while its DHR-1 domain binds PI(4,5)P2 through a C2-like fold to recruit DOCK8 to the plasma membrane; mutating the phosphoinositide-binding residues abolishes Cdc42 activation and interstitial migration in vivo [PMID:22461490, PMID:33574036]. In confined three-dimensional environments DOCK8, acting through Cdc42 and PAK, organizes a mechanosensitive central F-actin pool that protects cell and nuclear shape; its loss causes nuclear deformation, DNA damage, and migration-induced cell shattering (cytothripsis) rather than chemotaxis defects [PMID:25422492, PMID:40570086]. DOCK8 physically bridges WIP to WASp to form a DOCK8–WIP–WASp module that links the TCR and BCR to F-actin assembly, immune synapse formation, and mechanotransduction, with downstream consequences for WASp-dependent CD19 transcription and BCR signaling [PMID:27599296, PMID:29472447]. Beyond its actin role, DOCK8 serves as a signaling adaptor: it constitutively associates with MyD88 and Pyk2 to link TLR9 to a Lyn–Src–Syk–STAT3 cascade in B cells [PMID:22581261], controls IL-2–driven STAT5 phosphorylation in Tregs [PMID:28978795, PMID:28978806], and negatively regulates EPAS1 nuclear translocation in CD4+ T cells to restrain IL-31 and atopic skin inflammation [PMID:28067314]. DOCK8 activity is tuned by PKCα-mediated phosphorylation that releases it from the inhibitor LRCH1 to permit leading-edge Cdc42 activation during directional migration [PMID:28028151]. Loss-of-function studies in DOCK8-deficient patients and mice establish broad immunodeficiency affecting germinal center and marginal zone B cells, CD8 memory T cells, NKT cells, ILCs, NK cytotoxicity, and Treg fitness [PMID:19898472, PMID:22006977, PMID:23929855, PMID:28794229, PMID:33171169].","teleology":[{"year":2004,"claim":"Established DOCK8 as a Cdc42-binding, DOCK180-like protein linked to actin organization, defining its molecular family and first functional hypothesis.","evidence":"Yeast two-hybrid screen and immunofluorescence in transfected cells","pmids":["15304341"],"confidence":"Medium","gaps":["No GEF activity directly demonstrated","No physiological cell context","Localization based on overexpression"]},{"year":2009,"claim":"Showed DOCK8 is required in vivo for B cell humoral immunity, connecting it to immunological synapse function rather than core BCR signaling.","evidence":"ENU mutant mouse lines with germinal center, marginal zone, and synapse imaging readouts","pmids":["19898472"],"confidence":"High","gaps":["Molecular mechanism linking DOCK8 to ICAM-1 synapse accumulation not defined","No biochemical activity established"]},{"year":2011,"claim":"Defined DOCK8 as a cell-autonomous regulator of T cell survival and memory persistence, distinguishing thymic from postthymic requirements.","evidence":"Mouse and human mutant cells, transfer experiments, influenza infection, LFA-1 polarization imaging","pmids":["22006977","21969276"],"confidence":"High","gaps":["Mechanism of survival defect not resolved at signaling level","Link to GEF activity not yet established"]},{"year":2012,"claim":"Proved DOCK8 is a Cdc42-specific GEF whose DHR-2-mediated, spatially restricted Cdc42 activation is required for interstitial but not 2D migration.","evidence":"Knockout mice, domain-mutant rescue, and spatially resolved Cdc42 activity assays","pmids":["22461490"],"confidence":"High","gaps":["How DOCK8 is recruited to the leading edge not yet defined","Downstream effectors of Cdc42 in migration not identified here"]},{"year":2012,"claim":"Revealed an actin-independent adaptor role linking TLR9-MyD88 to a tyrosine kinase cascade, broadening DOCK8 function beyond GEF activity.","evidence":"Reciprocal Co-IP, phosphorylation assays, and selective TLR9 vs CD40 functional defect in patient B cells","pmids":["22581261"],"confidence":"High","gaps":["Whether adaptor function requires GEF activity untested","Structural basis of MyD88/Pyk2/Lyn binding unknown"]},{"year":2013,"claim":"Extended the survival requirement to NKT cell differentiation and persistence, implicating prosurvival factor regulation.","evidence":"Mouse KO subset analysis with Bcl-2 readouts, validated in patients","pmids":["23929855"],"confidence":"High","gaps":["Mechanism linking DOCK8 to Bcl-2 levels unknown","Whether defect is migration- or signaling-driven unresolved"]},{"year":2014,"claim":"Identified the central mechanism of DOCK8 immunodeficiency: a Cdc42-PAK-dependent program protecting migrating cells from cytothripsis in confined tissue.","evidence":"Live imaging of confined migration in patient and mouse cells with in vivo herpesvirus skin model","pmids":["25422492"],"confidence":"High","gaps":["Molecular link from Cdc42-PAK to cytoskeletal protection incomplete","Nuclear deformation mechanism not yet defined"]},{"year":2014,"claim":"Showed DOCK8 supports ILC survival and STAT3-dependent cytokine output, connecting it to mucosal antimicrobial defense.","evidence":"KO mice, Citrobacter infection, RNA-seq, IL-7 and STAT3 signaling assays","pmids":["25091235"],"confidence":"High","gaps":["Direct molecular link between DOCK8 and STAT3/IL-7 signaling unclear"]},{"year":2016,"claim":"Placed DOCK8 in the same TCR-to-actin pathway as WASp by demonstrating a DOCK8-WIP-WASp complex whose GEF activity drives F-actin assembly and mechanotransduction.","evidence":"Co-IP, GEF-dead rescue, actin and synapse imaging, transendothelial migration and lymph node homing in patient T cells","pmids":["27599296"],"confidence":"High","gaps":["Stoichiometry and assembly order of the DOCK8-WIP-WASp complex unresolved"]},{"year":2016,"claim":"Defined a Cdc42-MRCK-myosin axis for DOCK8 in macrophage migration via the LRAP35a adaptor, showing GEF activity (not scaffolding alone) is required.","evidence":"GEF-activity rescue, Co-IP, interaction-disruption, and myosin RLC phosphorylation assays in macrophages","pmids":["28028174"],"confidence":"High","gaps":["Whether this axis operates in lymphocytes untested","Direct LRAP35a binding interface not mapped"]},{"year":2016,"claim":"Identified an Nck1-binding proline-rich motif coupling DOCK8 to PDGF-driven Schwann cell precursor migration and Rho GTPase activation outside the immune system.","evidence":"siRNA knockdown, SH3-proline motif pulldown, domain-mutant rescue, migration and GTPase assays","pmids":["28955869"],"confidence":"Medium","gaps":["Single lab, non-immune context","Which Rho GTPase is activated not precisely defined"]},{"year":2017,"claim":"Discovered DOCK8 is held inactive by LRCH1 and released by PKCα phosphorylation, providing the spatial control mechanism for leading-edge Cdc42 activation.","evidence":"Competition binding, PKCα phosphosite mutagenesis, and EAE mouse models","pmids":["28028151"],"confidence":"High","gaps":["Upstream signals activating PKCα in this context not fully defined","Phosphosite dynamics in vivo not resolved"]},{"year":2017,"claim":"Defined DOCK8 as a negative regulator of EPAS1 nuclear translocation, linking its loss to IL-31-driven atopic skin disease.","evidence":"DOCK8 KO mice, conditional EPAS1 deletion rescue, promoter activation and nuclear translocation assays","pmids":["28067314"],"confidence":"High","gaps":["Biochemical mechanism by which DOCK8 retains EPAS1 in cytoplasm not defined"]},{"year":2017,"claim":"Established DOCK8 as essential for Treg fitness, synapse stability, and IL-2/STAT5 signaling, explaining its multiorgan autoimmunity phenotype.","evidence":"Treg-specific conditional KO, Co-IP DOCK8-STAT5, STAT5 phosphorylation, synapse imaging, CD86 transendocytosis","pmids":["28978795","28978806"],"confidence":"High","gaps":["Direct vs indirect basis of DOCK8-STAT5 association unclear","How actin and STAT5 roles intersect in Tregs unresolved"]},{"year":2017,"claim":"Showed DOCK8 controls NK cytotoxicity and cytokine output via proximal Src-family (Lck) kinase activation downstream of activating receptors.","evidence":"Knockdown and patient NK cells, Src/Lck activation assays, PMA/ionomycin rescue","pmids":["28794229"],"confidence":"High","gaps":["Mechanism coupling DOCK8 to Src-family kinase activation not defined"]},{"year":2018,"claim":"Connected DOCK8 to BCR signaling strength through WASp-dependent CD19 transcription, explaining impaired memory B cell activation.","evidence":"KO mice and patient PBMCs, TIRF/confocal imaging, pCD19/pBtk and WASP activation assays","pmids":["29472447"],"confidence":"High","gaps":["Transcriptional link between WASP and CD19 not mechanistically dissected in this system"]},{"year":2020,"claim":"Showed DOCK8 positions Tfh cells in germinal centers via LFA-1 activation, accounting for impaired T-dependent antibody responses.","evidence":"T cell-selective KO, intravital imaging, LFA-1 activation and ICAM-1 binding assays","pmids":["32573493"],"confidence":"High","gaps":["Signaling link from TCR to DOCK8-dependent LFA-1 activation not fully defined"]},{"year":2020,"claim":"Revealed that migration-induced shattering of DOCK8-deficient phagocytes releases IL-1β to drive a GM-CSF/TH2 skew, linking the cytothripsis mechanism to allergic immunopathology.","evidence":"Dock8-/- mice, Cryptococcus infection, IL-1β/GM-CSF/caspase blockade and apoptotic cell transfer","pmids":["33020661"],"confidence":"High","gaps":["Whether this circuit operates in human DOCK8 deficiency untested directly"]},{"year":2020,"claim":"Demonstrated DOCK8 maintains Treg stability in inflamed skin, preventing conversion to pathogenic ex-Tregs.","evidence":"Treg-specific KO, oxazolone CHS model, bidirectional Treg transfer","pmids":["33171169"],"confidence":"High","gaps":["Molecular driver of Treg destabilization downstream of DOCK8 loss unclear"]},{"year":2021,"claim":"Provided the structural basis for membrane recruitment by showing the DHR-1 C2-like domain stereospecifically binds PI(4,5)P2, required for Cdc42 activation and migration.","evidence":"Crystal structure, in vitro phosphoinositide binding, K576A/R581A mutagenesis, 3D and in vivo migration assays","pmids":["33574036"],"confidence":"High","gaps":["How DHR-1 lipid binding and DHR-2 catalysis are spatially coordinated not resolved"]},{"year":2021,"claim":"Showed DOCK8 negatively regulates intestinal ILC2 expansion through its Cdc42-activating catalytic center, defining a GEF-dependent restraint on type-2 immunity.","evidence":"Hematopoietic-specific deletion and DOCK8VAGR catalytic mutant mice with CyTOF phenotyping","pmids":["33940384"],"confidence":"High","gaps":["Cell-intrinsic vs extrinsic basis of ILC2 restraint not fully separated"]},{"year":2021,"claim":"Established a B cell-intrinsic Treg-mediated barrier to allergic skin inflammation, including responses to cutaneous S. aureus.","evidence":"Treg-inducible deletion, OVA and S. aureus skin models, adoptive Treg transfer rescue","pmids":["38185418"],"confidence":"High","gaps":["Mechanism of DOCK8-dependent inducible Treg stability not molecularly defined"]},{"year":2023,"claim":"Linked DOCK8 to metabolic fitness, showing it sustains long-lived gut IgA+ plasma cells through cellular respiration and glycolysis rather than early activation.","evidence":"B cell-specific KO, interactome mass spectrometry, Seahorse bioenergetics, immunization/infection models","pmids":["38159726"],"confidence":"High","gaps":["Which interactome partners mediate the metabolic phenotype not validated functionally"]},{"year":2024,"claim":"A patient-derived CRISPR knock-in confirmed DOCK8's role in BCR signaling via WASP activation and revealed dysregulated c-Myc-driven glycolysis in B cells.","evidence":"CRISPR knock-in mouse, BCR signaling and WASP activation assays, TIRF imaging, glycolysis assays","pmids":["39616183"],"confidence":"High","gaps":["Link between WASP signaling and c-Myc/glycolysis not mechanistically connected"]},{"year":2025,"claim":"Identified a mechanosensitive central F-actin pool, dependent on DOCK8 and Mst1, that protects the nucleus from confinement-induced DNA damage and senescence.","evidence":"KO mouse and patient T cells, live imaging under confinement, DNA damage and senescence assays, Mst1 genetics","pmids":["40570086"],"confidence":"High","gaps":["How Mst1 and DOCK8 mechanistically cooperate to build the central actin pool not resolved"]},{"year":null,"claim":"How DOCK8's GEF/cytoskeletal functions and its distinct adaptor/transcriptional-regulatory functions are integrated within a single cell, and the structural basis of its non-GEF protein interactions, remain unresolved.","evidence":"","pmids":[],"confidence":"High","gaps":["No unified model connecting actin-dependent and adaptor roles","Structural basis of MyD88, STAT5, and EPAS1 interactions undefined","Whether adaptor functions require GEF activity largely untested"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[2,11,21,25]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[3,7,12,14]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[0,6,7,27]},{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[21]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma 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Immunofluorescence showed that HA-tagged and endogenous DOCK8 localizes to cell edges at sites of lamellipodia formation. Transfection of a C-terminal fragment caused formation of vesicular structures containing filamentous actin, implicating DOCK8 in regulation of filamentous actin organization.\",\n      \"method\": \"Yeast two-hybrid screen, immunofluorescence, transient transfection\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — initial identification and localization by yeast two-hybrid and immunofluorescence, two orthogonal methods, single lab\",\n      \"pmids\": [\"15304341\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"DOCK8 mutations in mice abolish formation of marginal zone B cells and germinal center B cell persistence, preventing affinity maturation. DOCK8 mutations specifically disrupted accumulation of the integrin ligand ICAM-1 in the B cell immunological synapse but did not alter other aspects of B cell antigen receptor signaling.\",\n      \"method\": \"Mouse genetic screen (ENU mutagenesis), loss-of-function mouse model, immunological synapse imaging, flow cytometry\",\n      \"journal\": \"Nature immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — two independent DOCK8 mutant mouse lines, multiple orthogonal readouts (germinal center formation, marginal zone B cells, immunological synapse imaging), replicated across two mutants\",\n      \"pmids\": [\"19898472\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"DOCK8 is a Cdc42-specific guanine nucleotide exchange factor (GEF) required for interstitial dendritic cell migration. DOCK8-deficient DCs failed to accumulate in lymph node parenchyma, could not crawl in 3D fibrillar networks or transmigrate through the subcapsular sinus floor, but migrated normally on 2D surfaces. This function depended on the DHR-2 domain mediating Cdc42 activation. Spatial Cdc42 activation at the leading edge membrane (not global Cdc42 activity) was impaired in DOCK8-deficient DCs.\",\n      \"method\": \"DOCK8 knockout mice, 2D and 3D migration assays, domain mutant rescue experiments, Cdc42 activity assays (global and spatially resolved)\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — knockout mice plus DHR-2 domain mutant rescue plus spatial GTPase activity assay, multiple orthogonal methods in one study\",\n      \"pmids\": [\"22461490\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"DOCK8 functions as an adaptor in TLR9-MyD88 signaling in B cells. DOCK8 constitutively associates with MyD88 and the tyrosine kinase Pyk2. After TLR9 ligation, DOCK8 is tyrosine-phosphorylated by Pyk2, then binds the Src-family kinase Lyn, linking TLR9 to a Src-Syk-STAT3 cascade essential for TLR9-driven B cell proliferation and differentiation. TLR9-driven B cell activation was impaired in DOCK8-deficient patients, while CD40-driven activation was not.\",\n      \"method\": \"Co-immunoprecipitation, phosphorylation assays, DOCK8-deficient patient B cells, selective functional assays (TLR9 vs CD40 stimulation)\",\n      \"journal\": \"Nature immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP establishing the DOCK8-MyD88-Pyk2-Lyn complex, patient cells with selective TLR9 vs CD40 defect providing pathway placement, multiple orthogonal methods\",\n      \"pmids\": [\"22581261\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"DOCK8 is required cell-autonomously for peripheral CD8 T cell survival and function. DOCK8 mutation diminished naive CD8 T cell abundance, shortened naive CD8 T cell lifespan, impaired LFA-1 synaptic polarization upon DC encounter, delayed first cell division, and greatly reduced memory cell persistence after infection. These defects were established as postthymic and cell-autonomous in both mice and humans.\",\n      \"method\": \"DOCK8-mutant mice and human patient cells, cell transfer experiments (cell autonomy), in vivo influenza infection, LFA-1 polarization imaging, lifespan analysis\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — cell-autonomous defect shown by transfer experiments, replicated in both mouse and human, multiple functional readouts\",\n      \"pmids\": [\"22006977\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"DOCK8 deficiency in mice causes T cell lymphopenia with increased T cell turnover and decreased survival. Egress of mature CD4+ thymocytes is reduced with increased migration toward CXCL12. DOCK8 is limiting specifically for the survival of CD8+ memory T cells after viral infection, not for the primary CD8 response.\",\n      \"method\": \"DOCK8-deficient mouse analysis, flow cytometry, chemokine migration assays, influenza infection model\",\n      \"journal\": \"European journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO mouse model with multiple immune phenotypes measured, replicated findings consistent with parallel human study (PMID 22006977)\",\n      \"pmids\": [\"21969276\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"DOCK8, through CDC42 and p21-activated kinase (PAK), coordinates cytoskeletal structures during lymphocyte migration through confined, collagen-dense spaces. DOCK8-deficient T and NK cells develop cell shape and nuclear deformation abnormalities leading to cytothripsis (migration-induced catastrophic cell death) without impairing chemotaxis. This prevents generation of long-lived skin-resident memory CD8 T cells and impairs herpesvirus skin infection control.\",\n      \"method\": \"DOCK8-deficient patient and mouse cells, live imaging of lymphocyte migration through confined spaces, collagen matrix migration assays, in vivo herpesvirus skin infection model, resident memory T cell quantification\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — mechanism identified via live imaging in both patient and mouse cells, in vivo infection model, CDC42-PAK pathway placement by genetic evidence\",\n      \"pmids\": [\"25422492\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"DOCK8 bridges WASp-interacting protein (WIP) to WASp and actin in T cells, forming a DOCK8-WIP-WASp complex. The GEF activity of DOCK8 is essential for subcortical actin cytoskeleton integrity, TCR-driven WASp activation, F-actin assembly, immune synapse formation, actin foci formation, mechanotransduction, T cell transendothelial migration, and homing to lymph nodes — all of which also depend on WASp, placing DOCK8 and WASp in the same TCR-to-actin signaling pathway.\",\n      \"method\": \"Co-immunoprecipitation, DOCK8-deficient patient T cells, GEF-dead mutant rescue, actin assembly assays, immune synapse imaging, transendothelial migration assay, in vivo lymph node homing\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP establishing complex, GEF-dead mutant rescue experiments, patient cells, multiple orthogonal functional assays in one study\",\n      \"pmids\": [\"27599296\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"DOCK8 deficiency impairs NKT cell development, specifically affecting formation and survival of long-lived, differentiated NK1.1+ NKT cells expressing CD103 in the thymus. DOCK8-deficient NKT cells in the liver express reduced levels of the prosurvival factor Bcl-2 and LFA-1. Initial NKT cell response to antigen is intact but ongoing proliferative and cytokine responses are impaired.\",\n      \"method\": \"DOCK8-deficient mouse model, flow cytometry (thymic and hepatic NKT cell subsets), Bcl-2 expression analysis, antigen response assays, validation in DOCK8-deficient humans\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — mouse KO model with multiple cell subset analyses, replicated in human DOCK8-deficient patients, multiple orthogonal readouts\",\n      \"pmids\": [\"23929855\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"DOCK8 is absolutely required for dendritic cell migration during immune responses. Coincidental loss of DOCK8 in NLRP10-deficient mice (due to an unexpected Dock8 mutation) was shown by whole-exome sequencing and confirmed by targeted deletion: isolated DOCK8 deficiency recapitulates the DC migration defect. C3H/HeJ mice also harbor a Dock8 mutation that partially impairs DC migration.\",\n      \"method\": \"Proteomic screen, whole-exome sequencing, targeted Dock8 deletion, in vivo DC migration assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — causal role confirmed by targeted deletion after discovery via proteomics and sequencing; DC migration phenotype independently replicated\",\n      \"pmids\": [\"25713392\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"DOCK8 is a Cdc42-specific GEF required for macrophage migration in a 2D setting. The GEF activity of DOCK8 (not merely protein scaffolding) is required for macrophage migration. DOCK8 associates with LRAP35a, an adaptor that binds the Cdc42 effector MRCK, and facilitates MRCK phosphorylation of myosin II regulatory light chain. Disrupting the DOCK8-LRAP35a interaction in WT macrophages recapitulates the DOCK8-deficient migration defect.\",\n      \"method\": \"DOCK8-deficient macrophages, GEF-activity rescue experiments, co-immunoprecipitation, LRAP35a interaction-disruption experiments, myosin RLC phosphorylation assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — GEF activity requirement shown by rescue, DOCK8-LRAP35a interaction identified by Co-IP and disruption experiments, multiple methods in single lab\",\n      \"pmids\": [\"28028174\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"LRCH1 competes with Cdc42 for interaction with DOCK8, restraining T cell migration. In response to chemokine stimulation, PKCα phosphorylates DOCK8 at three serine sites, promoting DOCK8 separation from LRCH1 and translocation to the leading edge to guide T cell migration. Point mutations at DOCK8 serine sites block chemokine- and PKCα-induced T cell migration.\",\n      \"method\": \"Two screening systems (protein interaction screens), competition binding assays, PKCα phosphorylation assays, site-directed mutagenesis of DOCK8 serine sites, Dock8-mutant and Lrch1-transgenic/knockout mouse EAE models\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — biochemical competition assay, mutagenesis of phosphorylation sites with functional consequence, in vivo mouse disease model validation\",\n      \"pmids\": [\"28028151\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"DOCK8 is a negative regulator of nuclear translocation of the transcription factor EPAS1 in CD4+ T cells, acting as an adaptor. In DOCK8-deficient CD4+ T cells, EPAS1 translocates to the nucleus and drives IL-31 expression by activating the Il31 promoter in collaboration with SP1 (not ARNT). IL-31 induction drives atopic skin inflammation. Conditional deletion of EPAS1 in CD4+ T cells abrogates skin disease in DOCK8-deficient mice.\",\n      \"method\": \"DOCK8-deficient mouse model, conditional EPAS1 deletion, IL-31 production assays, promoter activation assays, nuclear translocation imaging\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — DOCK8 shown as adaptor/negative regulator of EPAS1 nuclear translocation; conditional gene deletion rescue confirming pathway; multiple orthogonal methods\",\n      \"pmids\": [\"28067314\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"DOCK8 regulates Treg fitness and function via IL-2 signaling in a STAT5-dependent manner. Treg-specific DOCK8 deletion caused spontaneous multiorgan inflammation. DOCK8-deficient Tregs are defective in competitive fitness and in vivo suppressive function. DOCK8 controls IL-2-driven STAT5 phosphorylation in Tregs.\",\n      \"method\": \"Conditional Treg-specific DOCK8 knockout mice, STAT5 phosphorylation assays, competitive fitness assays, in vivo suppression assays\",\n      \"journal\": \"JCI insight\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional knockout with Treg-specific phenotype, biochemical STAT5 phosphorylation assay, in vivo suppression, multiple orthogonal methods\",\n      \"pmids\": [\"28978795\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"DOCK8 associates with STAT5 and is required for IL-2-driven STAT5 phosphorylation in Tregs. DOCK8 localizes within the lamellar actin ring of the Treg immune synapse (IS). DOCK8-deficient Tregs have abnormal TCR-driven actin dynamics, decreased adhesiveness, an unstable IS with decreased recruitment of signaling molecules, and impaired transendocytosis of CD86. Mice with selective DOCK8 deficiency in Tregs develop lymphoproliferation, autoantibodies, and gastrointestinal inflammation.\",\n      \"method\": \"DOCK8-Treg conditional knockout mice, Co-IP (DOCK8-STAT5 association), STAT5 phosphorylation assays, IS imaging, actin dynamics assays, CD86 transendocytosis assay\",\n      \"journal\": \"JCI insight\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP establishing DOCK8-STAT5 interaction, conditional KO phenotype, biochemical signaling and IS imaging, multiple orthogonal methods\",\n      \"pmids\": [\"28978806\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"DOCK8 regulates NK cell cytotoxicity and cytokine production via Src family kinase (particularly Lck) activation downstream of target cell engagement or NKp30 ligation. Genetic ablation of DOCK8 in human NK cells attenuated cytokine transcription and secretion through inhibition of Src family kinase activation. PMA/ionomycin rescued cytokine production in DOCK8-deficient NK cells, indicating the defect is proximal to receptor ligation.\",\n      \"method\": \"DOCK8 knockdown in human NK cells, DOCK8-deficient patient NK cells, cytokine production assays, Src/Lck kinase activation assays, PMA/ionomycin rescue experiments\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic ablation in human cells plus patient validation, biochemical pathway placement via Src kinase assays, rescue experiment, multiple orthogonal methods\",\n      \"pmids\": [\"28794229\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"DOCK8 interacts with Nck1 via its unique N-terminal proline-rich motif binding the SH3 domain of Nck1 to promote PDGF-induced Schwann cell precursor migration. Knockdown of Dock8 or Nck1 markedly decreased PDGF-induced cell migration and Rho GTPase activation. Reintroduction of a proline-rich motif mutant of Dock8 failed to restore migration, while wild-type Dock8 restored it.\",\n      \"method\": \"siRNA knockdown, Co-IP/pulldown (proline-rich motif – SH3 interaction), domain mutant rescue, cell migration assays, Rho GTPase activation assays\",\n      \"journal\": \"Biochemistry and biophysics reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — domain mutant rescue plus Co-IP and functional migration/GTPase assays, single lab\",\n      \"pmids\": [\"28955869\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"DOCK8 regulates BCR signaling by controlling cd19 transcription via WASP. DOCK8-deficient B cells show reduced total WASP protein and reduced WASP activation; since WASP positively regulates CD19 transcription, reduced DOCK8 leads to decreased CD19 and impaired upstream BCR signaling (pCD19 and pBtk). DOCK8 deficiency disrupts early activation of memory B cells, including reduced BCR clustering, B cell spreading, and signalosome recruitment.\",\n      \"method\": \"DOCK8 knockout mouse model, DOCK8-deficient patient PBMCs, confocal microscopy, TIRF microscopy, BCR signaling assays (pCD19, pBtk), WASP expression and activation assays\",\n      \"journal\": \"Blood advances\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — mouse KO plus human patient validation, multiple imaging modalities and biochemical signaling readouts, mechanistic pathway established\",\n      \"pmids\": [\"29472447\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"DOCK8 is expressed in microglia and its expression increases during neuroinflammation. DOCK8-deficient mice exhibit reduced microglial migration through retinal layers in a model of MS/optic neuritis, and reduced severity of neuroinflammation. In a glaucoma model, DOCK8-deficient mice show impaired microglial phagocytosis of retinal ganglion cells.\",\n      \"method\": \"DOCK8-deficient mice, retinal immunofluorescence, disease models (optic neuritis and glaucoma), microglial migration and phagocytosis assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO model with two independent disease models and multiple cellular readouts, single lab\",\n      \"pmids\": [\"31337702\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"DOCK8-deficient CX3CR1+ mononuclear phagocytes are exquisitely sensitive to migration-induced cell shattering, releasing IL-1β. This IL-1β drives GM-CSF production by CD4+ T cells, resulting in a TH2 cell bias. Blocking IL-1β, GM-CSF, or caspase activation eliminated the type-2 skew in Dock8-/- mice.\",\n      \"method\": \"Dock8-/- mice, Cryptococcus neoformans pulmonary infection model, IL-1β and GM-CSF blocking experiments, caspase inhibition, apoptotic cell transfer experiments\",\n      \"journal\": \"Nature immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple genetic and pharmacological interventions (IL-1β block, GM-CSF block, caspase inhibition) each independently confirmed the pathway; published in high-impact journal with rigorous controls\",\n      \"pmids\": [\"33020661\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"DOCK8 is essential for LFA-1-dependent positioning of T follicular helper (Tfh) cells in germinal centers. Mice with T cell-selective DOCK8 deficiency had impaired IgG responses to T cell-dependent antigens, decreased GC size, and reduced GC B cells, despite normal Tfh numbers. Migration of DOCK8-deficient T cells into GCs was defective. Following TCR/CD3 ligation, DOCK8-deficient T cells showed impaired LFA-1 activation and reduced ICAM-1 binding.\",\n      \"method\": \"T cell-selective DOCK8 knockout mice, in vivo GC analysis, DOCK8-deficient T cell-B cell co-culture, LFA-1 activation assays, ICAM-1 binding assays, intravital imaging\",\n      \"journal\": \"JCI insight\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO with multiple in vivo phenotypes, biochemical LFA-1 activation assay, ICAM-1 binding, and mechanistic pathway established in one study\",\n      \"pmids\": [\"32573493\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"The DHR-1 domain of DOCK8 binds specifically to phosphatidylinositol 4,5-bisphosphate (PI(4,5)P2) and is required for DOCK8 recruitment to the plasma membrane. Crystal structure and biochemical analyses revealed a C2 domain-like core with a pocket containing three basic residues for stereospecific phosphoinositide recognition. Substitution of K576 and R581 with alanine abolished PI(4,5)P2 binding in vitro, ablated Cdc42 activation, and impaired leukocyte migration in 3D collagen gels. Dendritic cells carrying the mutation exhibited defective interstitial migration in vivo.\",\n      \"method\": \"Crystal structure of DHR-1 domain, in vitro phosphoinositide binding assays, site-directed mutagenesis (K576A/R581A), 3D migration assays, in vivo DC migration assay\",\n      \"journal\": \"Life science alliance\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure plus mutagenesis plus in vitro binding assay plus in vivo functional validation, multiple orthogonal methods in one study\",\n      \"pmids\": [\"33574036\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"DOCK8 deficiency in Tregs increases susceptibility to allergic skin inflammation and eczema. DOCK8 is important for Treg stability at sites of allergic inflammation and for generation, survival, and suppressive activity of inducible Tregs. Adoptive transfer of WT but not DOCK8-deficient OVA-specific inducible Tregs suppressed allergic inflammation in sensitized Dock8-/- mice. Cutaneous Staphylococcus aureus exposure in DOCK8-deficient mice caused severe allergic inflammation and elevated IgE attenuated by WT Treg transfer.\",\n      \"method\": \"Dock8-/- mice, Treg-specific inducible Dock8 deletion, epicutaneous OVA sensitization model, S. aureus topical exposure model, adoptive Treg transfer, skin biopsy histology and gene expression\",\n      \"journal\": \"The Journal of allergy and clinical immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Treg-specific conditional KO plus adoptive transfer rescue plus two independent skin inflammation models, multiple orthogonal methods\",\n      \"pmids\": [\"38185418\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"DOCK8 deficiency impairs RORγt+ ILC survival and function. DOCK8-deficient RORγt+ ILCs are less responsive to IL-7-mediated signaling, more prone to apoptosis, produce less IL-22, and have defective IL-23-mediated STAT3 phosphorylation. DOCK8 deficiency leads to susceptibility to Citrobacter rodentium infection associated with impaired antimicrobial peptide induction in the colon.\",\n      \"method\": \"Dock8-deficient mice, Citrobacter rodentium infection model, RNA-seq, IL-7 signaling assays, STAT3 phosphorylation assays, apoptosis assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — KO mouse model, in vivo infection, biochemical signaling assays (STAT3 phosphorylation), RNA-seq, multiple orthogonal methods\",\n      \"pmids\": [\"25091235\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"DOCK8 deficiency in CD147-overexpressing hepatocellular carcinoma cells: CD147 upregulates pY416-Src via FAK, Src promotes STAT3 phosphorylation, STAT3 facilitates DOCK8 transcription enhancing DOCK8 expression, and DOCK8 acts as a GEF for Rac1 to drive mesenchymal-type cell movement.\",\n      \"method\": \"Confocal microscopy, Rac1 activity assay, Src/STAT3 phosphorylation assays, DOCK8 overexpression/knockdown, transcription assays\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple biochemical assays in one lab establishing CD147→FAK→Src→STAT3→DOCK8→Rac1 pathway, single lab\",\n      \"pmids\": [\"25428919\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"DOCK8 deficiency causes a skewing to type 2 immunity in the gut with expansion of ILC2s. Intestinal ILC2 expansion occurs when DOCK8 expression is deleted in hematopoietic cells. Mice carrying mutations in the catalytic center of DOCK8 (DOCK8VAGR, failing to activate Cdc42) also show intestinal ILC2 expansion, indicating that DOCK8 negatively regulates intestinal ILC2s via Cdc42 activation.\",\n      \"method\": \"Dock8-/- mice, hematopoietic-specific Dock8 deletion, DOCK8 catalytic mutant (VAGR) mice, CyTOF high-dimensional phenotyping, ILC2 quantification\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — catalytic mutant mouse plus hematopoietic-specific deletion plus CyTOF phenotyping, GEF activity requirement established mechanistically\",\n      \"pmids\": [\"33940384\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"DOCK8 is required for the metabolic fitness and long-term survival of IgA+ plasma cells in the gut lamina propria. B cell-intrinsic DOCK8 is required for maintenance of antigen-specific IgA-secreting plasma cells. DOCK8 deficiency is not required for early B cell activation, migration, or IgA class switching. An interactome screen revealed DOCK8 protein partners involved in metabolism and apoptosis; Dock8-deficient IgA+ B cells have impaired cellular respiration and fail to engage glycolysis appropriately.\",\n      \"method\": \"Dock8-deficient mice, B cell-specific deletion, immunization and infection models, unbiased interactome screen (mass spectrometry), cellular respiration and glycolysis assays (Seahorse)\",\n      \"journal\": \"Mucosal immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — B cell-specific conditional KO, interactome screen with MS, bioenergetics assays, multiple orthogonal methods in one study\",\n      \"pmids\": [\"38159726\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"DOCK8-deficient activated T cells lack a central pool of F-actin that is present in wild-type murine and human T cells. This central actin pool is mechanosensitive and forms only under confinement. Loss of the central actin pool in Dock8-deficient T cells results in greater nuclear deformation, DNA damage accrual, and premature cell senescence. Mst1 kinase was identified as a necessary component of this mechanosensitive pathway alongside DOCK8.\",\n      \"method\": \"Dock8 knockout mice, human patient T cells, confocal and live imaging of F-actin under confinement, DNA damage assays, cell senescence assays, Mst1 genetic analysis\",\n      \"journal\": \"Science immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — KO mouse plus human patient validation, live imaging of mechanosensitive actin pool, DNA damage and senescence readouts, Mst1 pathway component identified\",\n      \"pmids\": [\"40570086\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"DOCK8 interacts with septin 7 and integrin-linked kinase (ILK) in primary blood-derived lymphocytes as identified by interaction proteomics. In equine recurrent uveitis (autoimmune disease model), DOCK8 expression and its interaction network are significantly altered.\",\n      \"method\": \"Interaction proteomics (Co-IP + mass spectrometry), flow cytometry for expression, equine autoimmune uveitis model\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single-lab pulldown/MS without functional follow-up of the specific interactions; disease model is equine, not standard mammalian model for DOCK8\",\n      \"pmids\": [\"30120291\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"DOCK8 expression in Tregs limits contact hypersensitivity by promoting Treg stability and fitness in inflamed skin. Lack of DOCK8 in Tregs resulted in their acquisition of a pathogenic FOXP3+T-bet+IFNγ+ phenotype at CHS sites and promoted conversion into ex-Tregs. Transfer of Dock8-/- Tregs increased the CHS response of WT recipients, while WT Tregs suppressed it.\",\n      \"method\": \"Dock8-/- mice, T cell- and Treg-specific DOCK8 knockout, oxazolone CHS model, oral tolerance assays, Treg transfer experiments, flow cytometry phenotyping\",\n      \"journal\": \"The Journal of investigative dermatology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Treg-specific KO plus adoptive transfer experiments in both directions plus in vivo disease model, multiple orthogonal methods\",\n      \"pmids\": [\"33171169\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"DOCK8 mutation (exon 45, c.5846C>A) generated by CRISPR/Cas9 in mice inhibits splenic MZ and GC B cell development and cripples BCR signaling. The reduced BCR signaling was related to decreased B cell spreading, BCR clustering, and signalosomes, mediated by inhibited activation of WASP. Additionally, DOCK8 mutation led to increased c-Myc expression in B cells, enhancing glycolysis.\",\n      \"method\": \"CRISPR/Cas9 knock-in mouse model (patient-derived point mutation), flow cytometry, BCR signaling assays, confocal/TIRF microscopy, WASP activation assays, metabolic (glycolysis) assays\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — patient-derived CRISPR knock-in model, multiple orthogonal methods (imaging, signaling, metabolic assays), mechanistic pathway established\",\n      \"pmids\": [\"39616183\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"DOCK8 is a Cdc42-specific (and context-dependent Rac1) guanine nucleotide exchange factor that operates through its DHR-2 catalytic domain and is recruited to the plasma membrane via PI(4,5)P2 binding by its DHR-1 domain; it organizes a mechanosensitive central F-actin pool in lymphocytes to maintain cell shape integrity during confined migration, links TCRs and BCRs to the actin cytoskeleton through a DOCK8–WIP–WASp complex, acts as a signaling adaptor connecting TLR9–MyD88 to a Pyk2–Lyn–Syk–STAT3 cascade in B cells, controls STAT5 phosphorylation downstream of IL-2 in Tregs, negatively regulates nuclear translocation of EPAS1 in CD4+ T cells to suppress IL-31 production, drives NK cell effector function through Src/Lck kinase activation, and is regulated by PKCα-mediated phosphorylation that releases it from LRCH1 to allow leading-edge Cdc42 activation during directional T cell migration.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"DOCK8 is a Cdc42-specific guanine nucleotide exchange factor that couples receptor and chemokine signals to actin-cytoskeletal remodeling, and it is essential for the survival, migration, and effector function of multiple leukocyte lineages [#2, #6]. Catalysis is mediated by its DHR-2 domain, which activates Cdc42 at the leading-edge membrane, while its DHR-1 domain binds PI(4,5)P2 through a C2-like fold to recruit DOCK8 to the plasma membrane; mutating the phosphoinositide-binding residues abolishes Cdc42 activation and interstitial migration in vivo [#2, #21]. In confined three-dimensional environments DOCK8, acting through Cdc42 and PAK, organizes a mechanosensitive central F-actin pool that protects cell and nuclear shape; its loss causes nuclear deformation, DNA damage, and migration-induced cell shattering (cytothripsis) rather than chemotaxis defects [#6, #27]. DOCK8 physically bridges WIP to WASp to form a DOCK8–WIP–WASp module that links the TCR and BCR to F-actin assembly, immune synapse formation, and mechanotransduction, with downstream consequences for WASp-dependent CD19 transcription and BCR signaling [#7, #17]. Beyond its actin role, DOCK8 serves as a signaling adaptor: it constitutively associates with MyD88 and Pyk2 to link TLR9 to a Lyn–Src–Syk–STAT3 cascade in B cells [#3], controls IL-2–driven STAT5 phosphorylation in Tregs [#13, #14], and negatively regulates EPAS1 nuclear translocation in CD4+ T cells to restrain IL-31 and atopic skin inflammation [#12]. DOCK8 activity is tuned by PKCα-mediated phosphorylation that releases it from the inhibitor LRCH1 to permit leading-edge Cdc42 activation during directional migration [#11]. Loss-of-function studies in DOCK8-deficient patients and mice establish broad immunodeficiency affecting germinal center and marginal zone B cells, CD8 memory T cells, NKT cells, ILCs, NK cytotoxicity, and Treg fitness [#1, #4, #8, #15, #29].\",\n  \"teleology\": [\n    {\n      \"year\": 2004,\n      \"claim\": \"Established DOCK8 as a Cdc42-binding, DOCK180-like protein linked to actin organization, defining its molecular family and first functional hypothesis.\",\n      \"evidence\": \"Yeast two-hybrid screen and immunofluorescence in transfected cells\",\n      \"pmids\": [\"15304341\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No GEF activity directly demonstrated\", \"No physiological cell context\", \"Localization based on overexpression\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Showed DOCK8 is required in vivo for B cell humoral immunity, connecting it to immunological synapse function rather than core BCR signaling.\",\n      \"evidence\": \"ENU mutant mouse lines with germinal center, marginal zone, and synapse imaging readouts\",\n      \"pmids\": [\"19898472\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism linking DOCK8 to ICAM-1 synapse accumulation not defined\", \"No biochemical activity established\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Defined DOCK8 as a cell-autonomous regulator of T cell survival and memory persistence, distinguishing thymic from postthymic requirements.\",\n      \"evidence\": \"Mouse and human mutant cells, transfer experiments, influenza infection, LFA-1 polarization imaging\",\n      \"pmids\": [\"22006977\", \"21969276\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of survival defect not resolved at signaling level\", \"Link to GEF activity not yet established\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Proved DOCK8 is a Cdc42-specific GEF whose DHR-2-mediated, spatially restricted Cdc42 activation is required for interstitial but not 2D migration.\",\n      \"evidence\": \"Knockout mice, domain-mutant rescue, and spatially resolved Cdc42 activity assays\",\n      \"pmids\": [\"22461490\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How DOCK8 is recruited to the leading edge not yet defined\", \"Downstream effectors of Cdc42 in migration not identified here\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Revealed an actin-independent adaptor role linking TLR9-MyD88 to a tyrosine kinase cascade, broadening DOCK8 function beyond GEF activity.\",\n      \"evidence\": \"Reciprocal Co-IP, phosphorylation assays, and selective TLR9 vs CD40 functional defect in patient B cells\",\n      \"pmids\": [\"22581261\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether adaptor function requires GEF activity untested\", \"Structural basis of MyD88/Pyk2/Lyn binding unknown\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Extended the survival requirement to NKT cell differentiation and persistence, implicating prosurvival factor regulation.\",\n      \"evidence\": \"Mouse KO subset analysis with Bcl-2 readouts, validated in patients\",\n      \"pmids\": [\"23929855\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism linking DOCK8 to Bcl-2 levels unknown\", \"Whether defect is migration- or signaling-driven unresolved\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Identified the central mechanism of DOCK8 immunodeficiency: a Cdc42-PAK-dependent program protecting migrating cells from cytothripsis in confined tissue.\",\n      \"evidence\": \"Live imaging of confined migration in patient and mouse cells with in vivo herpesvirus skin model\",\n      \"pmids\": [\"25422492\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular link from Cdc42-PAK to cytoskeletal protection incomplete\", \"Nuclear deformation mechanism not yet defined\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Showed DOCK8 supports ILC survival and STAT3-dependent cytokine output, connecting it to mucosal antimicrobial defense.\",\n      \"evidence\": \"KO mice, Citrobacter infection, RNA-seq, IL-7 and STAT3 signaling assays\",\n      \"pmids\": [\"25091235\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct molecular link between DOCK8 and STAT3/IL-7 signaling unclear\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Placed DOCK8 in the same TCR-to-actin pathway as WASp by demonstrating a DOCK8-WIP-WASp complex whose GEF activity drives F-actin assembly and mechanotransduction.\",\n      \"evidence\": \"Co-IP, GEF-dead rescue, actin and synapse imaging, transendothelial migration and lymph node homing in patient T cells\",\n      \"pmids\": [\"27599296\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry and assembly order of the DOCK8-WIP-WASp complex unresolved\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Defined a Cdc42-MRCK-myosin axis for DOCK8 in macrophage migration via the LRAP35a adaptor, showing GEF activity (not scaffolding alone) is required.\",\n      \"evidence\": \"GEF-activity rescue, Co-IP, interaction-disruption, and myosin RLC phosphorylation assays in macrophages\",\n      \"pmids\": [\"28028174\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether this axis operates in lymphocytes untested\", \"Direct LRAP35a binding interface not mapped\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Identified an Nck1-binding proline-rich motif coupling DOCK8 to PDGF-driven Schwann cell precursor migration and Rho GTPase activation outside the immune system.\",\n      \"evidence\": \"siRNA knockdown, SH3-proline motif pulldown, domain-mutant rescue, migration and GTPase assays\",\n      \"pmids\": [\"28955869\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab, non-immune context\", \"Which Rho GTPase is activated not precisely defined\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Discovered DOCK8 is held inactive by LRCH1 and released by PKCα phosphorylation, providing the spatial control mechanism for leading-edge Cdc42 activation.\",\n      \"evidence\": \"Competition binding, PKCα phosphosite mutagenesis, and EAE mouse models\",\n      \"pmids\": [\"28028151\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Upstream signals activating PKCα in this context not fully defined\", \"Phosphosite dynamics in vivo not resolved\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Defined DOCK8 as a negative regulator of EPAS1 nuclear translocation, linking its loss to IL-31-driven atopic skin disease.\",\n      \"evidence\": \"DOCK8 KO mice, conditional EPAS1 deletion rescue, promoter activation and nuclear translocation assays\",\n      \"pmids\": [\"28067314\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Biochemical mechanism by which DOCK8 retains EPAS1 in cytoplasm not defined\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Established DOCK8 as essential for Treg fitness, synapse stability, and IL-2/STAT5 signaling, explaining its multiorgan autoimmunity phenotype.\",\n      \"evidence\": \"Treg-specific conditional KO, Co-IP DOCK8-STAT5, STAT5 phosphorylation, synapse imaging, CD86 transendocytosis\",\n      \"pmids\": [\"28978795\", \"28978806\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct vs indirect basis of DOCK8-STAT5 association unclear\", \"How actin and STAT5 roles intersect in Tregs unresolved\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Showed DOCK8 controls NK cytotoxicity and cytokine output via proximal Src-family (Lck) kinase activation downstream of activating receptors.\",\n      \"evidence\": \"Knockdown and patient NK cells, Src/Lck activation assays, PMA/ionomycin rescue\",\n      \"pmids\": [\"28794229\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism coupling DOCK8 to Src-family kinase activation not defined\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Connected DOCK8 to BCR signaling strength through WASp-dependent CD19 transcription, explaining impaired memory B cell activation.\",\n      \"evidence\": \"KO mice and patient PBMCs, TIRF/confocal imaging, pCD19/pBtk and WASP activation assays\",\n      \"pmids\": [\"29472447\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Transcriptional link between WASP and CD19 not mechanistically dissected in this system\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Showed DOCK8 positions Tfh cells in germinal centers via LFA-1 activation, accounting for impaired T-dependent antibody responses.\",\n      \"evidence\": \"T cell-selective KO, intravital imaging, LFA-1 activation and ICAM-1 binding assays\",\n      \"pmids\": [\"32573493\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Signaling link from TCR to DOCK8-dependent LFA-1 activation not fully defined\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Revealed that migration-induced shattering of DOCK8-deficient phagocytes releases IL-1β to drive a GM-CSF/TH2 skew, linking the cytothripsis mechanism to allergic immunopathology.\",\n      \"evidence\": \"Dock8-/- mice, Cryptococcus infection, IL-1β/GM-CSF/caspase blockade and apoptotic cell transfer\",\n      \"pmids\": [\"33020661\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether this circuit operates in human DOCK8 deficiency untested directly\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Demonstrated DOCK8 maintains Treg stability in inflamed skin, preventing conversion to pathogenic ex-Tregs.\",\n      \"evidence\": \"Treg-specific KO, oxazolone CHS model, bidirectional Treg transfer\",\n      \"pmids\": [\"33171169\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular driver of Treg destabilization downstream of DOCK8 loss unclear\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Provided the structural basis for membrane recruitment by showing the DHR-1 C2-like domain stereospecifically binds PI(4,5)P2, required for Cdc42 activation and migration.\",\n      \"evidence\": \"Crystal structure, in vitro phosphoinositide binding, K576A/R581A mutagenesis, 3D and in vivo migration assays\",\n      \"pmids\": [\"33574036\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How DHR-1 lipid binding and DHR-2 catalysis are spatially coordinated not resolved\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Showed DOCK8 negatively regulates intestinal ILC2 expansion through its Cdc42-activating catalytic center, defining a GEF-dependent restraint on type-2 immunity.\",\n      \"evidence\": \"Hematopoietic-specific deletion and DOCK8VAGR catalytic mutant mice with CyTOF phenotyping\",\n      \"pmids\": [\"33940384\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cell-intrinsic vs extrinsic basis of ILC2 restraint not fully separated\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Established a B cell-intrinsic Treg-mediated barrier to allergic skin inflammation, including responses to cutaneous S. aureus.\",\n      \"evidence\": \"Treg-inducible deletion, OVA and S. aureus skin models, adoptive Treg transfer rescue\",\n      \"pmids\": [\"38185418\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of DOCK8-dependent inducible Treg stability not molecularly defined\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Linked DOCK8 to metabolic fitness, showing it sustains long-lived gut IgA+ plasma cells through cellular respiration and glycolysis rather than early activation.\",\n      \"evidence\": \"B cell-specific KO, interactome mass spectrometry, Seahorse bioenergetics, immunization/infection models\",\n      \"pmids\": [\"38159726\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Which interactome partners mediate the metabolic phenotype not validated functionally\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"A patient-derived CRISPR knock-in confirmed DOCK8's role in BCR signaling via WASP activation and revealed dysregulated c-Myc-driven glycolysis in B cells.\",\n      \"evidence\": \"CRISPR knock-in mouse, BCR signaling and WASP activation assays, TIRF imaging, glycolysis assays\",\n      \"pmids\": [\"39616183\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Link between WASP signaling and c-Myc/glycolysis not mechanistically connected\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Identified a mechanosensitive central F-actin pool, dependent on DOCK8 and Mst1, that protects the nucleus from confinement-induced DNA damage and senescence.\",\n      \"evidence\": \"KO mouse and patient T cells, live imaging under confinement, DNA damage and senescence assays, Mst1 genetics\",\n      \"pmids\": [\"40570086\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How Mst1 and DOCK8 mechanistically cooperate to build the central actin pool not resolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How DOCK8's GEF/cytoskeletal functions and its distinct adaptor/transcriptional-regulatory functions are integrated within a single cell, and the structural basis of its non-GEF protein interactions, remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No unified model connecting actin-dependent and adaptor roles\", \"Structural basis of MyD88, STAT5, and EPAS1 interactions undefined\", \"Whether adaptor functions require GEF activity largely untested\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [2, 11, 21, 25]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [3, 7, 12, 14]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [0, 6, 7, 27]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [21]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 2, 21]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [7, 27]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [12]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [1, 3, 4, 7, 13, 15]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [2, 11, 21]},\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [2, 6, 20]}\n    ],\n    \"complexes\": [\"DOCK8–WIP–WASp complex\"],\n    \"partners\": [\"CDC42\", \"WASP\", \"WIPF1\", \"MYD88\", \"PTK2B\", \"LRCH1\", \"STAT5\", \"NCK1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}