{"gene":"DAB1","run_date":"2026-06-09T22:57:19","timeline":{"discoveries":[{"year":2000,"finding":"Dab1 tyrosine phosphorylation is required for Reelin signaling during brain development. Mice expressing Dab1 with all tyrosine phosphorylation sites mutated phenocopy the Dab1-null mutant, demonstrating that phosphorylation at these sites (not merely Dab1 protein expression) is the functional output of Reelin signaling.","method":"Knock-in mouse expressing phosphorylation-site mutant Dab1 (all Tyr → Phe); in vivo neuronal positioning analysis","journal":"Current biology : CB","confidence":"High","confidence_rationale":"Tier 1/2 / Strong — in vivo mutagenesis of all phosphorylation sites in mice, rigorous genetic approach with clear phenotypic readout replicating null phenotype","pmids":["10959835"],"is_preprint":false},{"year":2003,"finding":"Reelin-induced Dab1 phosphorylation (requiring Src family kinase activity) leads to interaction of Dab1 with the PI3K regulatory subunit p85α, activating PI3K and downstream Akt while inhibiting GSK3β. PI3K signaling is required for normal cortical plate formation. Efficient Dab1 phosphorylation is impaired by cholesterol depletion of the plasma membrane.","method":"Co-immunoprecipitation of Dab1 and p85α; pharmacological inhibition of Src and PI3K; neuronal migration assay; cholesterol depletion experiments","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, multiple pharmacological methods, functional migration assay, consistent mechanistic chain established","pmids":["12882964"],"is_preprint":false},{"year":2004,"finding":"Reelin stimulation promotes binding of Crk-family proteins (CrkL, CrkI, CrkII) to tyrosine-phosphorylated Dab1 (at Y220 and Y232), which activates the C3G guanine nucleotide exchange factor and stimulates Rap1 GTPase, defining a Dab1→CrkL→C3G→Rap1 pathway downstream of Reelin.","method":"Pulldown of phospho-Dab1 binding proteins from embryonic brain; MS identification; Co-IP in Reelin-stimulated neurons; Rap1 activation assay; mutation of Y220 and Y232","journal":"Current biology : CB","confidence":"High","confidence_rationale":"Tier 2 / Strong — MS identification + Co-IP + GTPase activation assay + site-specific mutagenesis, multiple orthogonal methods","pmids":["15062102"],"is_preprint":false},{"year":2004,"finding":"CrkII and CrkL bind to tyrosine-phosphorylated Dab1 (requiring Y220 or Y232) in a Reelin-promoted manner. Dab1 also indirectly associates with Dock1 via CrkII. Expression of Dab1 interferes with CrkII-dependent cell migration, and the rough-eye phenotype caused by phospho-Dab1 in Drosophila is rescued by loss-of-function of myoblast city (Dock1 ortholog), suggesting that phospho-Dab1 engages the Crk-Dock1-Rac signaling cassette.","method":"Mass spectrometry identification of Dab1-binding proteins; Co-IP; cell migration assay; Drosophila genetic rescue","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 / Strong — MS + Co-IP + cell migration assay + in vivo genetic epistasis in Drosophila, multiple orthogonal methods","pmids":["15316068"],"is_preprint":false},{"year":2007,"finding":"Reelin-induced degradation of Dab1 requires phosphorylation at specific tyrosine residues and the E3 ubiquitin ligase component Cullin 5 (Cul5). Cul5 forms complexes with SOCS proteins that bind phosphorylated Dab1 and target it for proteasomal degradation. Ablation of Cul5 in migrating neurons causes accumulation of active Dab1 and excess neuronal migration to the top of the cortical plate.","method":"Conditional ablation of Cul5 in neurons (in vivo); biochemical demonstration of Cul5-SOCS-Dab1 complexes; Dab1 protein level assays","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo conditional knockout with defined phenotype, Co-IP of Cul5-SOCS-Dab1 complex, replicated across methods","pmids":["17974915"],"is_preprint":false},{"year":2010,"finding":"Cul5 regulates cortical layering exclusively by promoting Dab1 degradation: a stabilized Dab1 mutant that resists Cul5-dependent degradation phenocopies Cul5 deficiency, and Cul5 has no effect when Dab1 is absent. Cul5 removal increases neuronal migration speed by reducing stationary time and increasing step speed.","method":"Knock-in stabilized Dab1 mutant; Cul5 conditional knockout; in vivo neuronal migration analysis; time-lapse imaging","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — genetic epistasis with stabilized Dab1 knock-in plus Cul5 KO, live imaging of migration speed","pmids":["20410119"],"is_preprint":false},{"year":2005,"finding":"Dab1 PTB domain phosphoinositide-binding activity is required for membrane recruitment and basal Dab1 phosphorylation, while direct Dab1-receptor interaction is required for Reelin-stimulated (but not basal) Dab1 phosphorylation. These two binding activities are separable by distinct point mutations.","method":"Site-directed mutagenesis of Dab1 PTB domain; phosphorylation assays in neurons with Reelin stimulation","journal":"Brain research. Molecular brain research","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro mutagenesis with neuronal phosphorylation assays, two separable mutations establish two distinct mechanistic roles","pmids":["16046028"],"is_preprint":false},{"year":2006,"finding":"Dab1 interacts with APP and ApoER2 via their NPXY domains through the Dab1 PTB domain, increases surface levels of APP and ApoER2, and decreases Aβ production. Reelin treatment increases the Dab1-ApoER2 and Dab1-APP interactions and promotes α-secretase cleavage of APP while decreasing β-CTF and Aβ production. These effects are independent of Dab1 phosphorylation.","method":"Co-immunoprecipitation; surface biotinylation; live cell staining; transfection studies in cell lines and primary neurons; Reelin treatment","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, surface biotinylation, multiple cell systems, domain mapping with NPXY mutants","pmids":["16951405"],"is_preprint":false},{"year":2006,"finding":"Dab1 undergoes nucleocytoplasmic shuttling. In steady state it is cytoplasmic, but it accumulates in the nucleus upon CRM1 (exportin) inhibition. CRM1 binds Dab1 directly in a RanGTP-dependent manner. A bipartite nuclear localization signal and two CRM1-dependent nuclear export signals were mapped. Reelin stimulation or Fyn-induced tyrosine phosphorylation does not affect this subcellular distribution.","method":"Leptomycin B treatment; EGFP-Dab1 deletion/substitution mutants; in vitro binding with purified CRM1 and RanGTP; immunofluorescence in Neuro2a and primary neurons","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — reconstituted CRM1-Dab1 binding in vitro, NLS/NES mapped by mutagenesis, pharmacological nuclear export block, two cell types","pmids":["17062576"],"is_preprint":false},{"year":2008,"finding":"Dab1 has dual functions during brain development: two tyrosine residues (Y198/Y200) are required for Reelin-stimulated Dab1 phosphorylation at other sites, Akt activation, and Dab1 downregulation; the other two tyrosines (Y220/Y232) are required specifically to activate the Crk/CrkL-C3G pathway. Absence of the Crk/CrkL binding sites causes an unusual cortical layering phenotype distinct from complete Dab1 loss.","method":"Knock-in mice with pairs of Tyr→Phe mutations; complementation analysis; Akt activation assays; Crk/CrkL co-immunoprecipitation; cortical layering analysis","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — allele-specific in vivo mutagenesis with biochemical and neuroanatomical phenotype analysis, functional dissection of two phosphorylation site pairs","pmids":["18981215"],"is_preprint":false},{"year":2006,"finding":"Reconstitution of the complete Reelin signaling pathway in fibroblasts demonstrates that Dab1 phosphorylation does not depend on receptor localization in lipid rafts, and that phosphorylated Dab1 remains bound to the receptor tail after pathway activation.","method":"Stable reconstitution of pathway components in fibroblast cell lines; Reelin treatment; lipid raft fractionation; phosphorylation assays","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — reconstitution of pathway in heterologous cells, biochemical fractionation, clear mechanistic conclusion","pmids":["16354676"],"is_preprint":false},{"year":2004,"finding":"High-affinity binding of Dab1 to Reelin receptors (VLDLR and ApoER2) via the PTB domain is important for positioning of late-born cortical plate neurons. A point mutation F158V that strongly reduces PTB domain binding to receptor cytoplasmic tails causes a subtle phenotype only in hemizygous animals, specifically affecting late cortical plate neurons.","method":"Knock-in mouse with Dab1 F158V point mutation; in vitro binding assay with receptor peptides; in vivo neuroanatomical analysis","journal":"Brain research. Molecular brain research","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — in vitro binding assay combined with in vivo knock-in mouse, dose-sensitive phenotype demonstrating receptor binding requirement","pmids":["15249135"],"is_preprint":false},{"year":2011,"finding":"Dab1 acts cell-autonomously in translocating neocortical neurons to stabilize leading processes in a Rap1-dependent manner during somal translocation. Rap1, downstream of Dab1, controls cadherin function to regulate glia-independent somal translocation. Dab1 is required for somal translocation but not glia-guided locomotion.","method":"Conditional knockout of Dab1; in utero electroporation; Rap1 and cadherin functional assays; time-lapse imaging of neuronal migration","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 2 / Strong — cell-autonomous conditional KO with live imaging and biochemical dissection of Rap1-cadherin axis, multiple orthogonal methods","pmids":["21315259"],"is_preprint":false},{"year":2007,"finding":"Fyn kinase phosphorylates Dab1, and in the presence of Dab1, Fyn increases APP surface levels and promotes α-secretase cleavage (sAPPα production) and C-terminal fragment generation. Fyn-induced phosphorylation of APP at Y757 and increased APP surface levels are potentiated by Dab1. In vivo, Fyn knockout mice have decreased sAPPα, confirming Fyn's role in APP processing.","method":"Co-immunoprecipitation; co-immunostaining; FLIM; Fyn knockout mice; overexpression experiments; surface biotinylation","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple binding assays + in vivo Fyn KO validation + FLIM, multiple orthogonal methods","pmids":["18089558"],"is_preprint":false},{"year":2008,"finding":"Activated protein C (APC) binds with high affinity (~30 nM) to ApoER2 (but not VLDLR), triggering phosphorylation of Dab1 at Tyr-220 and Akt at Ser-473. APC-induced Dab1 and GSK3β phosphorylation is blocked by RAP (general LDL receptor antagonist) and by ApoER2 siRNA knockdown, establishing an APC→ApoER2→Dab1→PI3K/Akt→GSK3β pathway.","method":"Surface plasmon resonance binding; siRNA knockdown of ApoER2; pharmacological inhibition (LY294002); phosphorylation assays in U937 cells","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — SPR binding measurement, siRNA knockdown, pharmacological pathway dissection, multiple orthogonal methods in same study","pmids":["19116273"],"is_preprint":false},{"year":2011,"finding":"Dab1 knockdown neurons in the developing neocortex fail to enter the primitive cortical zone (PCZ) and cannot complete terminal translocation. Dab1-dependent terminal translocation (not locomotion) is specifically required for proper inside-out lamination. Dab1-KD locomoting neurons can pass wild-type predecessors beneath the PCZ.","method":"In utero electroporation with Dab1 shRNA; time-lapse analysis; sequential labeling experiments; in vivo cortical layer analysis","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — RNAi in vivo with time-lapse imaging and sequential electroporation, clear dissection of migration mode-specific role","pmids":["21697392"],"is_preprint":false},{"year":2018,"finding":"Endothelial Dab1 (together with ApoER2) mediates Reelin proangiogenic signaling in the CNS. Deletion of Dab1 in endothelial cells reduces laminin-α4 secretion and decreases integrin-β1 activation in glial cells, which in turn impairs neuronal migration and blood-brain barrier properties.","method":"Endothelial cell-specific Dab1 conditional knockout; vascularization analysis of retina and cortex; laminin secretion assays; integrin activation assays","journal":"Science","confidence":"High","confidence_rationale":"Tier 2 / Strong — cell-type-specific conditional KO with defined molecular mechanism (laminin-α4 secretion, integrin-β1 activation), multiple orthogonal readouts","pmids":["30139844"],"is_preprint":false},{"year":2014,"finding":"NOTCH signaling in colorectal cancer induces DAB1 expression. DAB1 is phosphorylated by ABL tyrosine kinase, which activates ABL reciprocally. Activated ABL phosphorylates TRIO (a RAC/RHOGEF protein) at Y2681, activating RHO and promoting colorectal cancer invasion and metastasis.","method":"Genetic depletion of DAB1 in intestinal polyposis mice; ABL inhibition; TRIO Y2681F phospho-mimetic and phospho-dead mutations; RHOGEF activity assay; invasion assays","journal":"Cancer discovery","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo genetic depletion + pharmacological ABL inhibition + TRIO mutagenesis + GEF activity assay, multiple orthogonal methods","pmids":["25432929"],"is_preprint":false},{"year":2018,"finding":"DCC (deleted in colorectal carcinoma) interacts with Dab1 via its P3 domain. Netrin-1 ligand of DCC induces Dab1 phosphorylation at Y220 and Y232. DCC knockdown or truncation of its P3 domain delays neuronal migration and impairs the multipolar-to-bipolar transition, which is rescued by phospho-mimetic Dab1 or constitutively active Fyn.","method":"Co-immunoprecipitation; domain truncation analysis; in utero electroporation knockdown; rescue with phospho-mimetic Dab1; Fyn constitutively active mutant","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP domain mapping + in vivo electroporation knockdown + genetic rescue with phospho-mimetic, multiple orthogonal methods","pmids":["29590626"],"is_preprint":false},{"year":2009,"finding":"Pafah1b2 (Alpha2 subunit of the Pafah1b complex) co-precipitates with Dab1 from brain extracts in a phosphorylation-independent manner, via a unique tyrosine residue on Alpha2. Alpha2 binding does not affect Dab1 phosphorylation but disrupts Dab1-Lis1 complex formation without affecting Dab1-VLDLR association.","method":"Co-immunoprecipitation from brain extracts; cell-free binding assays; Alpha2 knockout mice; phosphorylation assays","journal":"Brain research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP from brain and cell-free system, multiple mutant mice, single lab","pmids":["19272360"],"is_preprint":false},{"year":2015,"finding":"mTORC1 activation (as in TSC) upregulates Cul5 E3 ubiquitin ligase expression, leading to enhanced ubiquitination and degradation of phosphorylated Dab1, thereby impairing Reelin-Dab1 signaling and causing neuronal migration defects. Rapamycin treatment or Cul5 reduction restores Dab1 levels and normal neuronal migration.","method":"TSC mouse models; cortical tubers from TSC patients; Rheb overexpression; rapamycin treatment; Cul5 knockdown; Western blot for pDab1 and Cul5","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple genetic and pharmacological manipulations in vivo and in vitro, human patient tissue corroboration, mechanistic chain from mTORC1→Cul5→pDab1 degradation established","pmids":["26235615"],"is_preprint":false},{"year":2017,"finding":"Optogenetic activation of Dab1 (opto-Dab1) using light-induced Cry2 oligomerization is sufficient to activate downstream Reelin-Dab1 signals and control membrane protrusion, retraction, and ruffling with high spatiotemporal resolution. This shows that Dab1 activation alone is sufficient to orient cell movement.","method":"Optogenetic Cry2-Dab1 fusion (opto-Dab1); live cell imaging in COS7 cells and primary neurons; downstream signaling assays","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — single lab, gain-of-function optogenetic approach with live imaging, demonstrates Dab1 activation is sufficient for cell movement orientation","pmids":["28272509"],"is_preprint":false},{"year":2013,"finding":"Adult forebrain-specific conditional knockout of Dab1 in excitatory neurons causes defects in synaptic plasticity and hippocampal-dependent associative and spatial learning, accompanied by reduced dendritic spine size and defects in basal and plasticity-induced Akt and ERK1/2 signaling, without affecting neuronal positioning or dendrite morphology.","method":"Conditional knockout mouse (forebrain/excitatory neuron-specific Dab1 deletion); behavioral testing; electrophysiology; Akt/ERK1/2 phosphorylation assays; spine morphology analysis","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — cell-type-specific conditional KO with behavioral, electrophysiological, and biochemical readouts, multiple orthogonal methods","pmids":["24068831"],"is_preprint":false},{"year":2007,"finding":"Reelin-dependent Dab1 tyrosine phosphorylation by Src family kinases (Src/Fyn) is required for positioning of sympathetic preganglionic neurons (SPN) in the spinal cord. CrkL is partially required for Reelin-regulated SPN migration, establishing that the Dab1 tyrosine phosphorylation→CrkL pathway operates in spinal cord as well as cortex.","method":"Analysis of SPN position in dab1(5F/5F), src-/-fyn-/-, and crkl-/- mouse embryos; comparison to reeler phenotype","journal":"The Journal of comparative neurology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple genetic knockout models with defined neuroanatomical phenotype, in vivo epistasis","pmids":["17394141"],"is_preprint":false},{"year":2004,"finding":"Alternative splicing of chick Dab1 generates an early isoform (chDab1-E) lacking Src-family kinase recognition tyrosines and a late isoform (chDab1-L) containing them. Expression of chDab1-L induces morphological differentiation, Src kinase activation, and GAP-43 upregulation, while chDab1-E does not, with mutational analysis implicating Y198 specifically.","method":"Retinal culture transfection; morphological analysis; Src kinase phosphorylation assays; tyrosine mutagenesis (Y198F)","journal":"The EMBO journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — site-specific mutagenesis + functional assay in retinal cells, single lab","pmids":["15057276"],"is_preprint":false},{"year":2009,"finding":"In astrocytes, Dab1 (not Dab2) interacts with caveolin-1 and megalin, and is required for caveola-mediated endocytosis of albumin. Dab1 knockdown strongly reduces albumin internalization and the subsequent synthesis and release of the neurotrophic factor oleic acid.","method":"Dab1 siRNA knockdown in astrocyte primary cultures; albumin endocytosis assay; oleic acid synthesis measurement; Co-IP of Dab1 with caveolin-1 and megalin; electron microscopy","journal":"Journal of neurochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA knockdown + Co-IP + functional assay + EM, single lab","pmids":["19656258"],"is_preprint":false},{"year":2010,"finding":"Fe65 interacts with Dab1 via the C-terminal region of Dab1 (phosphorylation-independent). Dab1 competes with Fe65 for binding to APP via overlapping PTB domain binding sites, reducing Fe65-APP interaction. Dab1 also reduces APP-LRP1 complex formation and alters APP processing.","method":"Co-immunoprecipitation; competitive binding assays; APP/LRP1/secreted APP level measurements","journal":"Journal of cellular biochemistry","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — Co-IP binding studies with multiple partners, single lab, no mutagenesis of binding interface","pmids":["20568118"],"is_preprint":false},{"year":2013,"finding":"CIN85 colocalizes with ApoER2 in neurons in a Dab1-mediated, phosphorylation-independent manner at baseline. After Reelin stimulation, CIN85 is recruited to plasma membrane domains containing ApoER2 and Dab1, and then to EEA1-positive early endosomes. Tyrosine phosphorylation of Dab1 by Reelin strengthens the Dab1-CIN85 interaction.","method":"Co-immunoprecipitation; immunofluorescence in neurons; Reelin stimulation; endosomal marker co-localization","journal":"Genes to cells","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — Co-IP + immunofluorescence in neurons, mechanistically informative but single lab","pmids":["23506116"],"is_preprint":false},{"year":2011,"finding":"Fyn kinase promotes localization of both APP and Dab1 to detergent-resistant membrane (DRM/lipid raft) fractions. Nearly all tyrosine-phosphorylated Dab1 is in DRMs. Fyn knockout reduces DRM-associated APP, Dab1, and phospho-Dab1. Reelin treatment increases localization of APP and Dab1 to DRMs and decreases APP-Dab1 co-immunoprecipitation in a Fyn-dependent manner.","method":"DRM fractionation from wild-type and Fyn KO mice; co-immunoprecipitation; Reelin treatment of neurons; phosphorylation-deficient APP and Dab1 mutant expression","journal":"Journal of neurochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — fractionation + Co-IP + Fyn KO mice + Reelin treatment, single lab","pmids":["21534960"],"is_preprint":false},{"year":2023,"finding":"ZSWIM8 ubiquitin ligase controls protein quality of Dab1 by recognizing intrinsically disordered regions (IDRs) of Dab1 and eliminating misfolded Dab1 that cannot be properly phosphorylated. Conditional deletion of Zswim8 causes neuronal migration defects and impairs spine formation, associated with loss of normal Dab1 signaling strength.","method":"Conditional Zswim8 knockout in embryonic nervous system; CRISPR KO in hippocampal neurons; biochemical demonstration of ZSWIM8-Dab1 interaction; ubiquitination assays; spine/synapse morphology analysis","journal":"Cerebral cortex","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO with defined phenotype + biochemical interaction, single lab","pmids":["35989311"],"is_preprint":false},{"year":2023,"finding":"TRIM40 E3 ubiquitin ligase interacts with DAB1 and promotes K48-linked polyubiquitination and proteasomal degradation of DAB1, thereby limiting DAB1 stability and Reelin/DAB1 signaling-dependent inflammation in diabetic retinopathy.","method":"Co-IP and double immunofluorescence demonstrating TRIM40-DAB1 interaction; K48-linked ubiquitination assay; TRIM40 overexpression in cell and mouse models; AAV-TRIM40 injection","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP + ubiquitination assay + in vivo AAV overexpression, single lab","pmids":["37146559"],"is_preprint":false},{"year":2005,"finding":"Dab1 can complex with the cytoplasmic region of β1 integrin in a Reelin-dependent manner, while α3β1 integrin binds the N-terminal region of Reelin (distinct from the VLDLR/ApoER2 binding site), suggesting Dab1 can be recruited to integrin complexes upon Reelin stimulation.","method":"Co-immunoprecipitation; Reelin binding domain mapping; in vivo neuronal migration studies","journal":"Cerebral cortex","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — Co-IP showing Dab1-β1 integrin complex in Reelin-dependent manner, single lab with limited mechanistic follow-up","pmids":["15703255"],"is_preprint":false},{"year":2013,"finding":"VEGF treatment promotes association of VEGF receptor-2 (Flk1) with ApoER2 and leads to Flk1-dependent Dab1 phosphorylation and NR2B (NMDA receptor subunit) activation. VEGF treatment rescues deficits in phospho-Dab1 in reeler neurons, establishing Dab1 as a mediator of crosstalk between VEGF and Reelin signaling.","method":"Co-immunoprecipitation of Flk1-ApoER2; phosphorylation assays; Flk1 inhibition; Dab1 knockdown; reeler neuron rescue experiments","journal":"Neuroscience letters","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — Co-IP + pharmacological inhibition + reeler neuron rescue, single lab","pmids":["23916658"],"is_preprint":false},{"year":2018,"finding":"RBM4 RNA-binding protein directly regulates Dab1 alternative splicing, promoting inclusion of exons 7 and 8 in opposition to PTBP1. Full-length Dab1 (containing exons 7/8) but not the truncated isoform rescues neuronal migration defects in RBM4-depleted neurons, establishing that RBM4-controlled Dab1 splicing is required for cortical neuronal migration.","method":"RNA immunoprecipitation-sequencing; Rbm4a knockout brain; in utero electroporation knockdown; rescue with specific Dab1 isoforms","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — RIP-seq + KO + in vivo rescue with specific isoform, multiple orthogonal methods establishing mechanism","pmids":["29581187"],"is_preprint":false},{"year":2023,"finding":"SMARCD3 (BAF60C) chromatin remodeler regulates DAB1 expression by orchestrating cis-regulatory elements at the DAB1 locus, and increased SMARCD3 activates Reelin-DAB1-mediated Src kinase signaling to drive medulloblastoma metastasis. Medulloblastomas with increased SMARCD3 show a Src inhibitor response.","method":"Integrative genomics (ATAC-seq, ChIP-seq); SMARCD3 manipulation; Src kinase activation assays; Src inhibitor treatment in MB models","journal":"Nature cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multi-omic chromatin analysis + functional signaling assays + Src inhibitor response, single lab","pmids":["36849558"],"is_preprint":false}],"current_model":"DAB1 is an intracellular adaptor protein that docks to the NPXY motifs of VLDLR and ApoER2 Reelin receptors via its PTB domain (also capable of binding membrane phosphoinositides for membrane recruitment); upon Reelin binding to receptors, Src-family kinases (Fyn, Src) phosphorylate Dab1 at multiple tyrosines (Y198, Y200, Y220, Y232), triggering downstream signaling through at least two parallel arms—(1) PI3K p85α recruitment→Akt activation→GSK3β inhibition, and (2) CrkL/CrkII binding→C3G→Rap1→cadherin regulation for somal translocation; phosphorylated Dab1 is then ubiquitinated by a Cul5/SOCS E3 ligase complex for proteasomal degradation as a negative feedback mechanism, while misfolded Dab1 is cleared by ZSWIM8 for protein quality control; Dab1 also undergoes nucleocytoplasmic shuttling via CRM1-dependent export; and beyond Reelin, Dab1 can be activated by DCC/Netrin-1 and APC/ApoER2 signaling, and regulates APP trafficking and processing through competitive PTB-domain binding."},"narrative":{"mechanistic_narrative":"DAB1 is an intracellular adaptor protein that serves as the central cytoplasmic transducer of Reelin signaling controlling neuronal positioning during brain development [PMID:10959835, PMID:15249135]. Its phosphotyrosine-binding (PTB) domain docks to the NPXY motifs of the Reelin receptors VLDLR and ApoER2, and a separable phosphoinositide-binding activity of the same domain mediates membrane recruitment and basal phosphorylation [PMID:16046028, PMID:15249135]. Upon Reelin engagement, Src-family kinases (Src/Fyn) phosphorylate DAB1 on tyrosine residues, and this phosphorylation—not merely DAB1 expression—is the essential functional output, since a non-phosphorylatable allele phenocopies the null [PMID:10959835, PMID:17394141]. Phosphorylation is partitioned into functionally distinct site pairs: Y198/Y200 license further phosphorylation, Akt activation, and DAB1 downregulation, while Y220/Y232 recruit Crk-family adaptors to activate the C3G→Rap1 cassette [PMID:18981215, PMID:15062102]. These arms feed parallel effector pathways—PI3K p85α recruitment driving Akt activation and GSK3β inhibition [PMID:12882964], and CrkL/C3G/Rap1 signaling that controls cadherin function and the Dock1–Rac cassette to stabilize leading processes during glia-independent somal and terminal translocation [PMID:15062102, PMID:15316068, PMID:21315259, PMID:21697392]. Phosphorylated DAB1 is then targeted for proteasomal degradation by a Cullin5–SOCS E3 ligase complex, a negative-feedback step that restrains migration: loss of Cul5 or a degradation-resistant DAB1 allele causes excess migration, and this is the sole route by which Cul5 controls layering [PMID:17974915, PMID:20410119]. Additional quality-control and turnover ligases—ZSWIM8, which clears misfolded DAB1 via its intrinsically disordered regions, and TRIM40—further set DAB1 abundance [PMID:35989311, PMID:37146559]. Beyond neuronal migration, DAB1 functions in synaptic plasticity and hippocampal learning [PMID:24068831], in endothelial Reelin signaling that controls laminin-α4 secretion and blood-brain-barrier properties [PMID:30139844], and binds APP and ApoER2 through its PTB domain to increase their surface levels and shift APP toward α-secretase processing, reducing Aβ [PMID:16951405, PMID:18089558]. DAB1 is also activated by ligand systems beyond Reelin—activated protein C via ApoER2 and Netrin-1 via DCC [PMID:19116273, PMID:29590626]—and is co-opted in cancer, where NOTCH-induced DAB1 engages ABL/TRIO/RHO signaling to drive colorectal invasion [PMID:25432929].","teleology":[{"year":2000,"claim":"Established that tyrosine phosphorylation of DAB1, rather than its mere presence, is the functional readout of Reelin signaling in vivo.","evidence":"Knock-in mouse expressing all-Tyr→Phe DAB1 with neuronal positioning analysis","pmids":["10959835"],"confidence":"High","gaps":["Did not identify which kinase phosphorylates DAB1","Did not resolve which individual tyrosines carry distinct functions"]},{"year":2003,"claim":"Defined a PI3K/Akt/GSK3β effector arm downstream of Src-dependent DAB1 phosphorylation, linking Reelin to a defined signaling cascade required for cortical plate formation.","evidence":"Reciprocal Co-IP of DAB1 with p85α, Src/PI3K pharmacological inhibition, migration assays, cholesterol depletion","pmids":["12882964"],"confidence":"High","gaps":["Did not map which phosphotyrosines recruit p85α","Membrane microdomain dependence left ambiguous"]},{"year":2004,"claim":"Identified a parallel CrkL/CrkII→C3G→Rap1 arm engaged through DAB1 phosphotyrosines Y220/Y232, and connected it to Dock1/Rac-dependent migration machinery.","evidence":"MS identification of phospho-DAB1 partners, Co-IP, Rap1 activation assay, site mutagenesis, Drosophila genetic rescue","pmids":["15062102","15316068"],"confidence":"High","gaps":["Did not establish the in vivo migration phenotype of selective Crk-site loss","Relationship between Rap1 and Dock1/Rac arms unresolved"]},{"year":2004,"claim":"Demonstrated that high-affinity PTB-domain binding to VLDLR/ApoER2 tails is required specifically for positioning of late-born cortical neurons.","evidence":"DAB1 F158V knock-in mouse, in vitro receptor peptide binding, dose-sensitive neuroanatomical analysis","pmids":["15249135"],"confidence":"High","gaps":["Subtle phenotype only in hemizygotes leaves quantitative receptor-binding threshold unclear"]},{"year":2004,"claim":"Showed that alternative splicing generates DAB1 isoforms differing in Src-recognition tyrosines, coupling isoform choice to signaling competence.","evidence":"Chick retinal culture transfection, Src activation assays, Y198F mutagenesis","pmids":["15057276"],"confidence":"Medium","gaps":["Single lab in chick system","Splicing regulator not identified at this stage"]},{"year":2005,"claim":"Separated PTB-domain phosphoinositide binding (membrane recruitment, basal phosphorylation) from receptor binding (Reelin-stimulated phosphorylation) as distinct mechanistic functions.","evidence":"Point mutations dissecting PTB activities, neuronal phosphorylation assays","pmids":["16046028"],"confidence":"High","gaps":["Physiological balance of the two binding modes in vivo not quantified"]},{"year":2006,"claim":"Reconstituted the full Reelin pathway in fibroblasts and showed lipid-raft localization is dispensable for DAB1 phosphorylation, with phospho-DAB1 remaining receptor-bound.","evidence":"Heterologous reconstitution, lipid raft fractionation, phosphorylation assays","pmids":["16354676"],"confidence":"High","gaps":["Conflicts with later DRM-association findings on raft role","Heterologous system may not reflect neuronal context"]},{"year":2006,"claim":"Revealed a phosphorylation-independent role for DAB1 in APP/ApoER2 trafficking, increasing surface receptor levels and shifting APP toward non-amyloidogenic processing.","evidence":"Reciprocal Co-IP, surface biotinylation, NPXY domain mapping, Reelin treatment in multiple cell systems","pmids":["16951405"],"confidence":"High","gaps":["In vivo relevance to amyloid pathology not established","Mechanism of surface stabilization not detailed"]},{"year":2006,"claim":"Discovered CRM1-dependent nucleocytoplasmic shuttling of DAB1 with mapped NLS/NES, indicating a nuclear function independent of Reelin/Fyn signaling.","evidence":"Leptomycin B treatment, deletion mutants, in vitro CRM1/RanGTP binding, immunofluorescence","pmids":["17062576"],"confidence":"High","gaps":["Functional consequence of nuclear DAB1 unknown","No nuclear binding partners identified"]},{"year":2007,"claim":"Established Cullin5–SOCS-mediated proteasomal degradation of phospho-DAB1 as a negative-feedback brake on neuronal migration.","evidence":"Conditional Cul5 ablation in neurons, Cul5-SOCS-DAB1 complex biochemistry, DAB1 protein assays","pmids":["17974915"],"confidence":"High","gaps":["Which SOCS protein is principal in vivo not pinned down at this stage"]},{"year":2007,"claim":"Extended the Src/Fyn→DAB1→CrkL pathway beyond cortex to sympathetic preganglionic neuron positioning in the spinal cord.","evidence":"Neuroanatomical analysis of dab1(5F/5F), src/fyn, and crkl knockout embryos","pmids":["17394141"],"confidence":"High","gaps":["CrkL only partially required, implying additional effectors"]},{"year":2007,"claim":"Showed Fyn-dependent, DAB1-potentiated APP surface localization and α-secretase processing, with in vivo confirmation in Fyn-null mice.","evidence":"Co-IP, FLIM, surface biotinylation, Fyn knockout mice","pmids":["18089558"],"confidence":"High","gaps":["Interplay between Fyn phosphorylation and the phosphorylation-independent APP effects unclear"]},{"year":2008,"claim":"Genetically dissected DAB1 tyrosines into two functional pairs—Y198/Y200 (Akt/downregulation) and Y220/Y232 (Crk/C3G)—with distinct cortical phenotypes.","evidence":"Paired Tyr→Phe knock-in mice, complementation, Akt assays, Crk Co-IP, layering analysis","pmids":["18981215"],"confidence":"High","gaps":["How the two arms are integrated at the cellular level not resolved"]},{"year":2008,"claim":"Identified activated protein C as a non-Reelin ligand activating DAB1 through ApoER2-specific binding and PI3K/Akt/GSK3β signaling.","evidence":"SPR binding, ApoER2 siRNA, PI3K inhibition, phosphorylation assays in U937 cells","pmids":["19116273"],"confidence":"High","gaps":["Physiological/developmental context of APC-DAB1 signaling unclear"]},{"year":2009,"claim":"Identified Pafah1b2 (Alpha2) as a phosphorylation-independent DAB1 partner that disrupts the DAB1-Lis1 complex, linking DAB1 to migration machinery.","evidence":"Co-IP from brain, cell-free binding, Alpha2 knockout mice","pmids":["19272360"],"confidence":"Medium","gaps":["Single lab","Functional consequence of DAB1-Lis1 disruption in vivo not demonstrated"]},{"year":2009,"claim":"Revealed a non-neuronal-migration role for DAB1 in astrocyte caveola-mediated albumin endocytosis feeding neurotrophic oleic acid synthesis.","evidence":"siRNA knockdown, albumin endocytosis and oleic acid assays, Co-IP with caveolin-1/megalin, EM","pmids":["19656258"],"confidence":"Medium","gaps":["Single lab","Whether this requires DAB1 phosphorylation not tested"]},{"year":2010,"claim":"Proved Cul5 controls layering solely through DAB1 degradation and quantified that DAB1 stabilization speeds migration by reducing stationary time.","evidence":"Stabilized DAB1 knock-in, Cul5 conditional KO, time-lapse migration imaging","pmids":["20410119"],"confidence":"High","gaps":["Spatial/temporal triggers of degradation during migration not resolved"]},{"year":2010,"claim":"Showed DAB1 competes with Fe65 for APP binding and modulates APP-LRP1 complexes, refining the adaptor competition model for APP processing.","evidence":"Co-IP, competitive binding assays, APP processing measurements","pmids":["20568118"],"confidence":"Medium","gaps":["No mutagenesis of binding interface","Single lab"]},{"year":2011,"claim":"Defined DAB1 as cell-autonomously required for Rap1/cadherin-dependent somal translocation (not glia-guided locomotion), explaining its migration-mode specificity.","evidence":"Conditional KO, in utero electroporation, Rap1/cadherin assays, time-lapse imaging","pmids":["21315259","21697392"],"confidence":"High","gaps":["Mechanism by which Rap1 controls cadherin during translocation incomplete"]},{"year":2011,"claim":"Showed Fyn drives APP and DAB1 into detergent-resistant membranes where phospho-DAB1 concentrates, partially contradicting the raft-independence model.","evidence":"DRM fractionation from WT and Fyn KO mice, Co-IP, Reelin treatment","pmids":["21534960"],"confidence":"Medium","gaps":["Single lab","Reconciliation with reconstitution data (idx 10) unresolved"]},{"year":2013,"claim":"Demonstrated an adult-brain function of DAB1 in synaptic plasticity and hippocampal learning via Akt/ERK signaling, separable from its developmental positioning role.","evidence":"Forebrain-specific conditional KO, behavior, electrophysiology, spine morphology, phospho-Akt/ERK assays","pmids":["24068831"],"confidence":"High","gaps":["Upstream ligand/receptor for adult synaptic DAB1 signaling not defined"]},{"year":2013,"claim":"Placed DAB1 at a node of VEGF-Reelin crosstalk through Flk1-ApoER2 association and NR2B activation.","evidence":"Co-IP, Flk1 inhibition, DAB1 knockdown, reeler neuron rescue","pmids":["23916658"],"confidence":"Medium","gaps":["Single lab","Physiological setting of VEGF-Reelin crosstalk unclear"]},{"year":2013,"claim":"Identified CIN85 as a phosphorylation-sensitive DAB1 partner coupling ApoER2/DAB1 to endosomal trafficking after Reelin.","evidence":"Co-IP, immunofluorescence with endosomal markers, Reelin stimulation","pmids":["23506116"],"confidence":"Medium","gaps":["Single lab","Functional outcome of endosomal recruitment not established"]},{"year":2014,"claim":"Revealed an oncogenic DAB1 axis in colorectal cancer: NOTCH-induced DAB1 reciprocally activates ABL, which phosphorylates TRIO to drive RHO-dependent invasion.","evidence":"In vivo DAB1 depletion in polyposis mice, ABL inhibition, TRIO Y2681 mutants, GEF and invasion assays","pmids":["25432929"],"confidence":"High","gaps":["Relationship of this ABL/TRIO arm to canonical Reelin signaling unclear"]},{"year":2015,"claim":"Connected mTORC1 hyperactivation to DAB1 destabilization via Cul5 upregulation, providing a mechanism for migration defects in tuberous sclerosis.","evidence":"TSC mouse models, patient tubers, Rheb overexpression, rapamycin, Cul5 knockdown, phospho-DAB1 blots","pmids":["26235615"],"confidence":"High","gaps":["Direct transcriptional vs post-transcriptional control of Cul5 by mTORC1 not fully defined"]},{"year":2017,"claim":"Showed via optogenetics that DAB1 activation alone is sufficient to orient cell movement and control membrane dynamics.","evidence":"Cry2-based opto-DAB1, live imaging in COS7 and neurons, downstream signaling assays","pmids":["28272509"],"confidence":"Medium","gaps":["Single lab gain-of-function","Does not establish endogenous spatiotemporal regulation"]},{"year":2018,"claim":"Established DCC/Netrin-1 as an additional receptor system activating DAB1 (Y220/Y232 phosphorylation) to drive the multipolar-to-bipolar transition.","evidence":"Co-IP domain mapping, in vivo knockdown, rescue with phospho-mimetic DAB1 and constitutively active Fyn","pmids":["29590626"],"confidence":"High","gaps":["Cross-talk between DCC and Reelin receptor inputs not resolved"]},{"year":2018,"claim":"Demonstrated a vascular/endothelial role for DAB1 in CNS angiogenesis controlling laminin-α4 secretion and integrin-β1 activation that feeds back on neuronal migration and BBB integrity.","evidence":"Endothelial-specific conditional KO, vascularization analysis, laminin secretion and integrin activation assays","pmids":["30139844"],"confidence":"High","gaps":["Endothelial DAB1 effector pathway downstream not fully mapped"]},{"year":2018,"claim":"Showed RBM4-controlled alternative splicing producing full-length DAB1 (exons 7/8) is required for cortical neuronal migration, in opposition to PTBP1.","evidence":"RIP-seq, Rbm4a KO brain, in vivo knockdown, isoform-specific rescue","pmids":["29581187"],"confidence":"High","gaps":["How splice variation tunes signaling output quantitatively not detailed"]},{"year":2023,"claim":"Identified ZSWIM8 as a protein-quality-control ligase that recognizes DAB1 intrinsically disordered regions to clear misfolded DAB1, with KO causing migration and spine defects.","evidence":"Conditional Zswim8 KO, CRISPR KO neurons, ZSWIM8-DAB1 interaction and ubiquitination assays, morphology","pmids":["35989311"],"confidence":"Medium","gaps":["Single lab","Distinction from Cul5-mediated phospho-dependent degradation not fully delineated"]},{"year":2023,"claim":"Identified TRIM40 as an E3 ligase promoting K48 polyubiquitination and degradation of DAB1, limiting Reelin/DAB1-driven inflammation in diabetic retinopathy.","evidence":"Co-IP, K48 ubiquitination assay, TRIM40 overexpression, AAV-TRIM40 in vivo","pmids":["37146559"],"confidence":"Medium","gaps":["Single lab","Whether degradation is phosphorylation-dependent untested"]},{"year":2023,"claim":"Showed SMARCD3-mediated chromatin remodeling at the DAB1 locus activates Reelin-DAB1-Src signaling to drive medulloblastoma metastasis, nominating Src inhibition.","evidence":"ATAC/ChIP-seq, SMARCD3 manipulation, Src activation assays and inhibitor response in MB models","pmids":["36849558"],"confidence":"Medium","gaps":["Single lab","Direct cis-element to DAB1 regulatory link not fully resolved"]},{"year":null,"claim":"The function of nuclear DAB1 and how its multiple degradation routes (Cul5, ZSWIM8, TRIM40) are coordinated spatiotemporally during migration and in disease remain unresolved.","evidence":"No direct experimental resolution in the available corpus","pmids":[],"confidence":"Low","gaps":["No nuclear binding partner or nuclear function identified","Coordination/hierarchy among E3 ligases unknown","Integration of multiple receptor inputs (Reelin, DCC, APC, VEGF) onto shared DAB1 outputs unclear"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[6,7,11,2]},{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[6]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[8]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[8]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[6,27]},{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[27]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[1,2,14,18]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[0,11,12,15]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[4,5,29,30]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[17,20,34]}],"complexes":["Cul5-SOCS E3 ubiquitin ligase complex"],"partners":["VLDLR","LRP8","FYN","PIK3R1","CRKL","APP","DCC","CUL5"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"O75553","full_name":"Disabled homolog 1","aliases":[],"length_aa":588,"mass_kda":63.8,"function":"Signaling adapter of the reelin-mediated signaling pathway, which regulates the migration and differentiation of postmitotic neurons during brain development. Mediates intracellular transduction of Reelin signaling following reelin (RELN)-binding to its receptor: acts by docking proteins through its phosphotyrosine residues and PID domain","subcellular_location":"Cytoplasm","url":"https://www.uniprot.org/uniprotkb/O75553/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/DAB1","classification":"Not Classified","n_dependent_lines":1,"n_total_lines":1208,"dependency_fraction":0.0008278145695364238},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/DAB1","total_profiled":1310},"omim":[{"mim_id":"618859","title":"NEURODEVELOPMENTAL DISORDER WITH OR WITHOUT AUTISTIC FEATURES AND/OR STRUCTURAL BRAIN ABNORMALITIES; NEDASB","url":"https://www.omim.org/entry/618859"},{"mim_id":"618073","title":"STERILE ALPHA MOTIF DOMAIN-CONTAINING PROTEIN 12; SAMD12","url":"https://www.omim.org/entry/618073"},{"mim_id":"617201","title":"PERIVENTRICULAR NODULAR HETEROTOPIA 7; PVNH7","url":"https://www.omim.org/entry/617201"},{"mim_id":"615945","title":"SPINOCEREBELLAR ATAXIA 37; SCA37","url":"https://www.omim.org/entry/615945"},{"mim_id":"614566","title":"DYNEIN, AXONEMAL, ASSEMBLY FACTOR 3; DNAAF3","url":"https://www.omim.org/entry/614566"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Enhanced","locations":[{"location":"Vesicles","reliability":"Enhanced"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"brain","ntpm":15.2},{"tissue":"intestine","ntpm":21.1},{"tissue":"seminal 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Mice expressing Dab1 with all tyrosine phosphorylation sites mutated phenocopy the Dab1-null mutant, demonstrating that phosphorylation at these sites (not merely Dab1 protein expression) is the functional output of Reelin signaling.\",\n      \"method\": \"Knock-in mouse expressing phosphorylation-site mutant Dab1 (all Tyr → Phe); in vivo neuronal positioning analysis\",\n      \"journal\": \"Current biology : CB\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 / Strong — in vivo mutagenesis of all phosphorylation sites in mice, rigorous genetic approach with clear phenotypic readout replicating null phenotype\",\n      \"pmids\": [\"10959835\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Reelin-induced Dab1 phosphorylation (requiring Src family kinase activity) leads to interaction of Dab1 with the PI3K regulatory subunit p85α, activating PI3K and downstream Akt while inhibiting GSK3β. PI3K signaling is required for normal cortical plate formation. Efficient Dab1 phosphorylation is impaired by cholesterol depletion of the plasma membrane.\",\n      \"method\": \"Co-immunoprecipitation of Dab1 and p85α; pharmacological inhibition of Src and PI3K; neuronal migration assay; cholesterol depletion experiments\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, multiple pharmacological methods, functional migration assay, consistent mechanistic chain established\",\n      \"pmids\": [\"12882964\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Reelin stimulation promotes binding of Crk-family proteins (CrkL, CrkI, CrkII) to tyrosine-phosphorylated Dab1 (at Y220 and Y232), which activates the C3G guanine nucleotide exchange factor and stimulates Rap1 GTPase, defining a Dab1→CrkL→C3G→Rap1 pathway downstream of Reelin.\",\n      \"method\": \"Pulldown of phospho-Dab1 binding proteins from embryonic brain; MS identification; Co-IP in Reelin-stimulated neurons; Rap1 activation assay; mutation of Y220 and Y232\",\n      \"journal\": \"Current biology : CB\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — MS identification + Co-IP + GTPase activation assay + site-specific mutagenesis, multiple orthogonal methods\",\n      \"pmids\": [\"15062102\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"CrkII and CrkL bind to tyrosine-phosphorylated Dab1 (requiring Y220 or Y232) in a Reelin-promoted manner. Dab1 also indirectly associates with Dock1 via CrkII. Expression of Dab1 interferes with CrkII-dependent cell migration, and the rough-eye phenotype caused by phospho-Dab1 in Drosophila is rescued by loss-of-function of myoblast city (Dock1 ortholog), suggesting that phospho-Dab1 engages the Crk-Dock1-Rac signaling cassette.\",\n      \"method\": \"Mass spectrometry identification of Dab1-binding proteins; Co-IP; cell migration assay; Drosophila genetic rescue\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — MS + Co-IP + cell migration assay + in vivo genetic epistasis in Drosophila, multiple orthogonal methods\",\n      \"pmids\": [\"15316068\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Reelin-induced degradation of Dab1 requires phosphorylation at specific tyrosine residues and the E3 ubiquitin ligase component Cullin 5 (Cul5). Cul5 forms complexes with SOCS proteins that bind phosphorylated Dab1 and target it for proteasomal degradation. Ablation of Cul5 in migrating neurons causes accumulation of active Dab1 and excess neuronal migration to the top of the cortical plate.\",\n      \"method\": \"Conditional ablation of Cul5 in neurons (in vivo); biochemical demonstration of Cul5-SOCS-Dab1 complexes; Dab1 protein level assays\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo conditional knockout with defined phenotype, Co-IP of Cul5-SOCS-Dab1 complex, replicated across methods\",\n      \"pmids\": [\"17974915\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Cul5 regulates cortical layering exclusively by promoting Dab1 degradation: a stabilized Dab1 mutant that resists Cul5-dependent degradation phenocopies Cul5 deficiency, and Cul5 has no effect when Dab1 is absent. Cul5 removal increases neuronal migration speed by reducing stationary time and increasing step speed.\",\n      \"method\": \"Knock-in stabilized Dab1 mutant; Cul5 conditional knockout; in vivo neuronal migration analysis; time-lapse imaging\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — genetic epistasis with stabilized Dab1 knock-in plus Cul5 KO, live imaging of migration speed\",\n      \"pmids\": [\"20410119\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Dab1 PTB domain phosphoinositide-binding activity is required for membrane recruitment and basal Dab1 phosphorylation, while direct Dab1-receptor interaction is required for Reelin-stimulated (but not basal) Dab1 phosphorylation. These two binding activities are separable by distinct point mutations.\",\n      \"method\": \"Site-directed mutagenesis of Dab1 PTB domain; phosphorylation assays in neurons with Reelin stimulation\",\n      \"journal\": \"Brain research. Molecular brain research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro mutagenesis with neuronal phosphorylation assays, two separable mutations establish two distinct mechanistic roles\",\n      \"pmids\": [\"16046028\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Dab1 interacts with APP and ApoER2 via their NPXY domains through the Dab1 PTB domain, increases surface levels of APP and ApoER2, and decreases Aβ production. Reelin treatment increases the Dab1-ApoER2 and Dab1-APP interactions and promotes α-secretase cleavage of APP while decreasing β-CTF and Aβ production. These effects are independent of Dab1 phosphorylation.\",\n      \"method\": \"Co-immunoprecipitation; surface biotinylation; live cell staining; transfection studies in cell lines and primary neurons; Reelin treatment\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, surface biotinylation, multiple cell systems, domain mapping with NPXY mutants\",\n      \"pmids\": [\"16951405\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Dab1 undergoes nucleocytoplasmic shuttling. In steady state it is cytoplasmic, but it accumulates in the nucleus upon CRM1 (exportin) inhibition. CRM1 binds Dab1 directly in a RanGTP-dependent manner. A bipartite nuclear localization signal and two CRM1-dependent nuclear export signals were mapped. Reelin stimulation or Fyn-induced tyrosine phosphorylation does not affect this subcellular distribution.\",\n      \"method\": \"Leptomycin B treatment; EGFP-Dab1 deletion/substitution mutants; in vitro binding with purified CRM1 and RanGTP; immunofluorescence in Neuro2a and primary neurons\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — reconstituted CRM1-Dab1 binding in vitro, NLS/NES mapped by mutagenesis, pharmacological nuclear export block, two cell types\",\n      \"pmids\": [\"17062576\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Dab1 has dual functions during brain development: two tyrosine residues (Y198/Y200) are required for Reelin-stimulated Dab1 phosphorylation at other sites, Akt activation, and Dab1 downregulation; the other two tyrosines (Y220/Y232) are required specifically to activate the Crk/CrkL-C3G pathway. Absence of the Crk/CrkL binding sites causes an unusual cortical layering phenotype distinct from complete Dab1 loss.\",\n      \"method\": \"Knock-in mice with pairs of Tyr→Phe mutations; complementation analysis; Akt activation assays; Crk/CrkL co-immunoprecipitation; cortical layering analysis\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — allele-specific in vivo mutagenesis with biochemical and neuroanatomical phenotype analysis, functional dissection of two phosphorylation site pairs\",\n      \"pmids\": [\"18981215\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Reconstitution of the complete Reelin signaling pathway in fibroblasts demonstrates that Dab1 phosphorylation does not depend on receptor localization in lipid rafts, and that phosphorylated Dab1 remains bound to the receptor tail after pathway activation.\",\n      \"method\": \"Stable reconstitution of pathway components in fibroblast cell lines; Reelin treatment; lipid raft fractionation; phosphorylation assays\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — reconstitution of pathway in heterologous cells, biochemical fractionation, clear mechanistic conclusion\",\n      \"pmids\": [\"16354676\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"High-affinity binding of Dab1 to Reelin receptors (VLDLR and ApoER2) via the PTB domain is important for positioning of late-born cortical plate neurons. A point mutation F158V that strongly reduces PTB domain binding to receptor cytoplasmic tails causes a subtle phenotype only in hemizygous animals, specifically affecting late cortical plate neurons.\",\n      \"method\": \"Knock-in mouse with Dab1 F158V point mutation; in vitro binding assay with receptor peptides; in vivo neuroanatomical analysis\",\n      \"journal\": \"Brain research. Molecular brain research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — in vitro binding assay combined with in vivo knock-in mouse, dose-sensitive phenotype demonstrating receptor binding requirement\",\n      \"pmids\": [\"15249135\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Dab1 acts cell-autonomously in translocating neocortical neurons to stabilize leading processes in a Rap1-dependent manner during somal translocation. Rap1, downstream of Dab1, controls cadherin function to regulate glia-independent somal translocation. Dab1 is required for somal translocation but not glia-guided locomotion.\",\n      \"method\": \"Conditional knockout of Dab1; in utero electroporation; Rap1 and cadherin functional assays; time-lapse imaging of neuronal migration\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — cell-autonomous conditional KO with live imaging and biochemical dissection of Rap1-cadherin axis, multiple orthogonal methods\",\n      \"pmids\": [\"21315259\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Fyn kinase phosphorylates Dab1, and in the presence of Dab1, Fyn increases APP surface levels and promotes α-secretase cleavage (sAPPα production) and C-terminal fragment generation. Fyn-induced phosphorylation of APP at Y757 and increased APP surface levels are potentiated by Dab1. In vivo, Fyn knockout mice have decreased sAPPα, confirming Fyn's role in APP processing.\",\n      \"method\": \"Co-immunoprecipitation; co-immunostaining; FLIM; Fyn knockout mice; overexpression experiments; surface biotinylation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple binding assays + in vivo Fyn KO validation + FLIM, multiple orthogonal methods\",\n      \"pmids\": [\"18089558\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Activated protein C (APC) binds with high affinity (~30 nM) to ApoER2 (but not VLDLR), triggering phosphorylation of Dab1 at Tyr-220 and Akt at Ser-473. APC-induced Dab1 and GSK3β phosphorylation is blocked by RAP (general LDL receptor antagonist) and by ApoER2 siRNA knockdown, establishing an APC→ApoER2→Dab1→PI3K/Akt→GSK3β pathway.\",\n      \"method\": \"Surface plasmon resonance binding; siRNA knockdown of ApoER2; pharmacological inhibition (LY294002); phosphorylation assays in U937 cells\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — SPR binding measurement, siRNA knockdown, pharmacological pathway dissection, multiple orthogonal methods in same study\",\n      \"pmids\": [\"19116273\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Dab1 knockdown neurons in the developing neocortex fail to enter the primitive cortical zone (PCZ) and cannot complete terminal translocation. Dab1-dependent terminal translocation (not locomotion) is specifically required for proper inside-out lamination. Dab1-KD locomoting neurons can pass wild-type predecessors beneath the PCZ.\",\n      \"method\": \"In utero electroporation with Dab1 shRNA; time-lapse analysis; sequential labeling experiments; in vivo cortical layer analysis\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — RNAi in vivo with time-lapse imaging and sequential electroporation, clear dissection of migration mode-specific role\",\n      \"pmids\": [\"21697392\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Endothelial Dab1 (together with ApoER2) mediates Reelin proangiogenic signaling in the CNS. Deletion of Dab1 in endothelial cells reduces laminin-α4 secretion and decreases integrin-β1 activation in glial cells, which in turn impairs neuronal migration and blood-brain barrier properties.\",\n      \"method\": \"Endothelial cell-specific Dab1 conditional knockout; vascularization analysis of retina and cortex; laminin secretion assays; integrin activation assays\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — cell-type-specific conditional KO with defined molecular mechanism (laminin-α4 secretion, integrin-β1 activation), multiple orthogonal readouts\",\n      \"pmids\": [\"30139844\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"NOTCH signaling in colorectal cancer induces DAB1 expression. DAB1 is phosphorylated by ABL tyrosine kinase, which activates ABL reciprocally. Activated ABL phosphorylates TRIO (a RAC/RHOGEF protein) at Y2681, activating RHO and promoting colorectal cancer invasion and metastasis.\",\n      \"method\": \"Genetic depletion of DAB1 in intestinal polyposis mice; ABL inhibition; TRIO Y2681F phospho-mimetic and phospho-dead mutations; RHOGEF activity assay; invasion assays\",\n      \"journal\": \"Cancer discovery\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo genetic depletion + pharmacological ABL inhibition + TRIO mutagenesis + GEF activity assay, multiple orthogonal methods\",\n      \"pmids\": [\"25432929\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"DCC (deleted in colorectal carcinoma) interacts with Dab1 via its P3 domain. Netrin-1 ligand of DCC induces Dab1 phosphorylation at Y220 and Y232. DCC knockdown or truncation of its P3 domain delays neuronal migration and impairs the multipolar-to-bipolar transition, which is rescued by phospho-mimetic Dab1 or constitutively active Fyn.\",\n      \"method\": \"Co-immunoprecipitation; domain truncation analysis; in utero electroporation knockdown; rescue with phospho-mimetic Dab1; Fyn constitutively active mutant\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP domain mapping + in vivo electroporation knockdown + genetic rescue with phospho-mimetic, multiple orthogonal methods\",\n      \"pmids\": [\"29590626\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Pafah1b2 (Alpha2 subunit of the Pafah1b complex) co-precipitates with Dab1 from brain extracts in a phosphorylation-independent manner, via a unique tyrosine residue on Alpha2. Alpha2 binding does not affect Dab1 phosphorylation but disrupts Dab1-Lis1 complex formation without affecting Dab1-VLDLR association.\",\n      \"method\": \"Co-immunoprecipitation from brain extracts; cell-free binding assays; Alpha2 knockout mice; phosphorylation assays\",\n      \"journal\": \"Brain research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP from brain and cell-free system, multiple mutant mice, single lab\",\n      \"pmids\": [\"19272360\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"mTORC1 activation (as in TSC) upregulates Cul5 E3 ubiquitin ligase expression, leading to enhanced ubiquitination and degradation of phosphorylated Dab1, thereby impairing Reelin-Dab1 signaling and causing neuronal migration defects. Rapamycin treatment or Cul5 reduction restores Dab1 levels and normal neuronal migration.\",\n      \"method\": \"TSC mouse models; cortical tubers from TSC patients; Rheb overexpression; rapamycin treatment; Cul5 knockdown; Western blot for pDab1 and Cul5\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple genetic and pharmacological manipulations in vivo and in vitro, human patient tissue corroboration, mechanistic chain from mTORC1→Cul5→pDab1 degradation established\",\n      \"pmids\": [\"26235615\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Optogenetic activation of Dab1 (opto-Dab1) using light-induced Cry2 oligomerization is sufficient to activate downstream Reelin-Dab1 signals and control membrane protrusion, retraction, and ruffling with high spatiotemporal resolution. This shows that Dab1 activation alone is sufficient to orient cell movement.\",\n      \"method\": \"Optogenetic Cry2-Dab1 fusion (opto-Dab1); live cell imaging in COS7 cells and primary neurons; downstream signaling assays\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — single lab, gain-of-function optogenetic approach with live imaging, demonstrates Dab1 activation is sufficient for cell movement orientation\",\n      \"pmids\": [\"28272509\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Adult forebrain-specific conditional knockout of Dab1 in excitatory neurons causes defects in synaptic plasticity and hippocampal-dependent associative and spatial learning, accompanied by reduced dendritic spine size and defects in basal and plasticity-induced Akt and ERK1/2 signaling, without affecting neuronal positioning or dendrite morphology.\",\n      \"method\": \"Conditional knockout mouse (forebrain/excitatory neuron-specific Dab1 deletion); behavioral testing; electrophysiology; Akt/ERK1/2 phosphorylation assays; spine morphology analysis\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — cell-type-specific conditional KO with behavioral, electrophysiological, and biochemical readouts, multiple orthogonal methods\",\n      \"pmids\": [\"24068831\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Reelin-dependent Dab1 tyrosine phosphorylation by Src family kinases (Src/Fyn) is required for positioning of sympathetic preganglionic neurons (SPN) in the spinal cord. CrkL is partially required for Reelin-regulated SPN migration, establishing that the Dab1 tyrosine phosphorylation→CrkL pathway operates in spinal cord as well as cortex.\",\n      \"method\": \"Analysis of SPN position in dab1(5F/5F), src-/-fyn-/-, and crkl-/- mouse embryos; comparison to reeler phenotype\",\n      \"journal\": \"The Journal of comparative neurology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple genetic knockout models with defined neuroanatomical phenotype, in vivo epistasis\",\n      \"pmids\": [\"17394141\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Alternative splicing of chick Dab1 generates an early isoform (chDab1-E) lacking Src-family kinase recognition tyrosines and a late isoform (chDab1-L) containing them. Expression of chDab1-L induces morphological differentiation, Src kinase activation, and GAP-43 upregulation, while chDab1-E does not, with mutational analysis implicating Y198 specifically.\",\n      \"method\": \"Retinal culture transfection; morphological analysis; Src kinase phosphorylation assays; tyrosine mutagenesis (Y198F)\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — site-specific mutagenesis + functional assay in retinal cells, single lab\",\n      \"pmids\": [\"15057276\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"In astrocytes, Dab1 (not Dab2) interacts with caveolin-1 and megalin, and is required for caveola-mediated endocytosis of albumin. Dab1 knockdown strongly reduces albumin internalization and the subsequent synthesis and release of the neurotrophic factor oleic acid.\",\n      \"method\": \"Dab1 siRNA knockdown in astrocyte primary cultures; albumin endocytosis assay; oleic acid synthesis measurement; Co-IP of Dab1 with caveolin-1 and megalin; electron microscopy\",\n      \"journal\": \"Journal of neurochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA knockdown + Co-IP + functional assay + EM, single lab\",\n      \"pmids\": [\"19656258\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Fe65 interacts with Dab1 via the C-terminal region of Dab1 (phosphorylation-independent). Dab1 competes with Fe65 for binding to APP via overlapping PTB domain binding sites, reducing Fe65-APP interaction. Dab1 also reduces APP-LRP1 complex formation and alters APP processing.\",\n      \"method\": \"Co-immunoprecipitation; competitive binding assays; APP/LRP1/secreted APP level measurements\",\n      \"journal\": \"Journal of cellular biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — Co-IP binding studies with multiple partners, single lab, no mutagenesis of binding interface\",\n      \"pmids\": [\"20568118\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"CIN85 colocalizes with ApoER2 in neurons in a Dab1-mediated, phosphorylation-independent manner at baseline. After Reelin stimulation, CIN85 is recruited to plasma membrane domains containing ApoER2 and Dab1, and then to EEA1-positive early endosomes. Tyrosine phosphorylation of Dab1 by Reelin strengthens the Dab1-CIN85 interaction.\",\n      \"method\": \"Co-immunoprecipitation; immunofluorescence in neurons; Reelin stimulation; endosomal marker co-localization\",\n      \"journal\": \"Genes to cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — Co-IP + immunofluorescence in neurons, mechanistically informative but single lab\",\n      \"pmids\": [\"23506116\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Fyn kinase promotes localization of both APP and Dab1 to detergent-resistant membrane (DRM/lipid raft) fractions. Nearly all tyrosine-phosphorylated Dab1 is in DRMs. Fyn knockout reduces DRM-associated APP, Dab1, and phospho-Dab1. Reelin treatment increases localization of APP and Dab1 to DRMs and decreases APP-Dab1 co-immunoprecipitation in a Fyn-dependent manner.\",\n      \"method\": \"DRM fractionation from wild-type and Fyn KO mice; co-immunoprecipitation; Reelin treatment of neurons; phosphorylation-deficient APP and Dab1 mutant expression\",\n      \"journal\": \"Journal of neurochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — fractionation + Co-IP + Fyn KO mice + Reelin treatment, single lab\",\n      \"pmids\": [\"21534960\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"ZSWIM8 ubiquitin ligase controls protein quality of Dab1 by recognizing intrinsically disordered regions (IDRs) of Dab1 and eliminating misfolded Dab1 that cannot be properly phosphorylated. Conditional deletion of Zswim8 causes neuronal migration defects and impairs spine formation, associated with loss of normal Dab1 signaling strength.\",\n      \"method\": \"Conditional Zswim8 knockout in embryonic nervous system; CRISPR KO in hippocampal neurons; biochemical demonstration of ZSWIM8-Dab1 interaction; ubiquitination assays; spine/synapse morphology analysis\",\n      \"journal\": \"Cerebral cortex\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO with defined phenotype + biochemical interaction, single lab\",\n      \"pmids\": [\"35989311\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"TRIM40 E3 ubiquitin ligase interacts with DAB1 and promotes K48-linked polyubiquitination and proteasomal degradation of DAB1, thereby limiting DAB1 stability and Reelin/DAB1 signaling-dependent inflammation in diabetic retinopathy.\",\n      \"method\": \"Co-IP and double immunofluorescence demonstrating TRIM40-DAB1 interaction; K48-linked ubiquitination assay; TRIM40 overexpression in cell and mouse models; AAV-TRIM40 injection\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP + ubiquitination assay + in vivo AAV overexpression, single lab\",\n      \"pmids\": [\"37146559\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Dab1 can complex with the cytoplasmic region of β1 integrin in a Reelin-dependent manner, while α3β1 integrin binds the N-terminal region of Reelin (distinct from the VLDLR/ApoER2 binding site), suggesting Dab1 can be recruited to integrin complexes upon Reelin stimulation.\",\n      \"method\": \"Co-immunoprecipitation; Reelin binding domain mapping; in vivo neuronal migration studies\",\n      \"journal\": \"Cerebral cortex\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — Co-IP showing Dab1-β1 integrin complex in Reelin-dependent manner, single lab with limited mechanistic follow-up\",\n      \"pmids\": [\"15703255\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"VEGF treatment promotes association of VEGF receptor-2 (Flk1) with ApoER2 and leads to Flk1-dependent Dab1 phosphorylation and NR2B (NMDA receptor subunit) activation. VEGF treatment rescues deficits in phospho-Dab1 in reeler neurons, establishing Dab1 as a mediator of crosstalk between VEGF and Reelin signaling.\",\n      \"method\": \"Co-immunoprecipitation of Flk1-ApoER2; phosphorylation assays; Flk1 inhibition; Dab1 knockdown; reeler neuron rescue experiments\",\n      \"journal\": \"Neuroscience letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — Co-IP + pharmacological inhibition + reeler neuron rescue, single lab\",\n      \"pmids\": [\"23916658\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"RBM4 RNA-binding protein directly regulates Dab1 alternative splicing, promoting inclusion of exons 7 and 8 in opposition to PTBP1. Full-length Dab1 (containing exons 7/8) but not the truncated isoform rescues neuronal migration defects in RBM4-depleted neurons, establishing that RBM4-controlled Dab1 splicing is required for cortical neuronal migration.\",\n      \"method\": \"RNA immunoprecipitation-sequencing; Rbm4a knockout brain; in utero electroporation knockdown; rescue with specific Dab1 isoforms\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — RIP-seq + KO + in vivo rescue with specific isoform, multiple orthogonal methods establishing mechanism\",\n      \"pmids\": [\"29581187\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"SMARCD3 (BAF60C) chromatin remodeler regulates DAB1 expression by orchestrating cis-regulatory elements at the DAB1 locus, and increased SMARCD3 activates Reelin-DAB1-mediated Src kinase signaling to drive medulloblastoma metastasis. Medulloblastomas with increased SMARCD3 show a Src inhibitor response.\",\n      \"method\": \"Integrative genomics (ATAC-seq, ChIP-seq); SMARCD3 manipulation; Src kinase activation assays; Src inhibitor treatment in MB models\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multi-omic chromatin analysis + functional signaling assays + Src inhibitor response, single lab\",\n      \"pmids\": [\"36849558\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"DAB1 is an intracellular adaptor protein that docks to the NPXY motifs of VLDLR and ApoER2 Reelin receptors via its PTB domain (also capable of binding membrane phosphoinositides for membrane recruitment); upon Reelin binding to receptors, Src-family kinases (Fyn, Src) phosphorylate Dab1 at multiple tyrosines (Y198, Y200, Y220, Y232), triggering downstream signaling through at least two parallel arms—(1) PI3K p85α recruitment→Akt activation→GSK3β inhibition, and (2) CrkL/CrkII binding→C3G→Rap1→cadherin regulation for somal translocation; phosphorylated Dab1 is then ubiquitinated by a Cul5/SOCS E3 ligase complex for proteasomal degradation as a negative feedback mechanism, while misfolded Dab1 is cleared by ZSWIM8 for protein quality control; Dab1 also undergoes nucleocytoplasmic shuttling via CRM1-dependent export; and beyond Reelin, Dab1 can be activated by DCC/Netrin-1 and APC/ApoER2 signaling, and regulates APP trafficking and processing through competitive PTB-domain binding.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"DAB1 is an intracellular adaptor protein that serves as the central cytoplasmic transducer of Reelin signaling controlling neuronal positioning during brain development [#0, #11]. Its phosphotyrosine-binding (PTB) domain docks to the NPXY motifs of the Reelin receptors VLDLR and ApoER2, and a separable phosphoinositide-binding activity of the same domain mediates membrane recruitment and basal phosphorylation [#6, #11]. Upon Reelin engagement, Src-family kinases (Src/Fyn) phosphorylate DAB1 on tyrosine residues, and this phosphorylation—not merely DAB1 expression—is the essential functional output, since a non-phosphorylatable allele phenocopies the null [#0, #23]. Phosphorylation is partitioned into functionally distinct site pairs: Y198/Y200 license further phosphorylation, Akt activation, and DAB1 downregulation, while Y220/Y232 recruit Crk-family adaptors to activate the C3G→Rap1 cassette [#9, #2]. These arms feed parallel effector pathways—PI3K p85α recruitment driving Akt activation and GSK3β inhibition [#1], and CrkL/C3G/Rap1 signaling that controls cadherin function and the Dock1–Rac cassette to stabilize leading processes during glia-independent somal and terminal translocation [#2, #3, #12, #15]. Phosphorylated DAB1 is then targeted for proteasomal degradation by a Cullin5–SOCS E3 ligase complex, a negative-feedback step that restrains migration: loss of Cul5 or a degradation-resistant DAB1 allele causes excess migration, and this is the sole route by which Cul5 controls layering [#4, #5]. Additional quality-control and turnover ligases—ZSWIM8, which clears misfolded DAB1 via its intrinsically disordered regions, and TRIM40—further set DAB1 abundance [#29, #30]. Beyond neuronal migration, DAB1 functions in synaptic plasticity and hippocampal learning [#22], in endothelial Reelin signaling that controls laminin-α4 secretion and blood-brain-barrier properties [#16], and binds APP and ApoER2 through its PTB domain to increase their surface levels and shift APP toward α-secretase processing, reducing Aβ [#7, #13]. DAB1 is also activated by ligand systems beyond Reelin—activated protein C via ApoER2 and Netrin-1 via DCC [#14, #18]—and is co-opted in cancer, where NOTCH-induced DAB1 engages ABL/TRIO/RHO signaling to drive colorectal invasion [#17].\",\n  \"teleology\": [\n    {\n      \"year\": 2000,\n      \"claim\": \"Established that tyrosine phosphorylation of DAB1, rather than its mere presence, is the functional readout of Reelin signaling in vivo.\",\n      \"evidence\": \"Knock-in mouse expressing all-Tyr→Phe DAB1 with neuronal positioning analysis\",\n      \"pmids\": [\"10959835\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not identify which kinase phosphorylates DAB1\", \"Did not resolve which individual tyrosines carry distinct functions\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Defined a PI3K/Akt/GSK3β effector arm downstream of Src-dependent DAB1 phosphorylation, linking Reelin to a defined signaling cascade required for cortical plate formation.\",\n      \"evidence\": \"Reciprocal Co-IP of DAB1 with p85α, Src/PI3K pharmacological inhibition, migration assays, cholesterol depletion\",\n      \"pmids\": [\"12882964\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not map which phosphotyrosines recruit p85α\", \"Membrane microdomain dependence left ambiguous\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Identified a parallel CrkL/CrkII→C3G→Rap1 arm engaged through DAB1 phosphotyrosines Y220/Y232, and connected it to Dock1/Rac-dependent migration machinery.\",\n      \"evidence\": \"MS identification of phospho-DAB1 partners, Co-IP, Rap1 activation assay, site mutagenesis, Drosophila genetic rescue\",\n      \"pmids\": [\"15062102\", \"15316068\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not establish the in vivo migration phenotype of selective Crk-site loss\", \"Relationship between Rap1 and Dock1/Rac arms unresolved\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Demonstrated that high-affinity PTB-domain binding to VLDLR/ApoER2 tails is required specifically for positioning of late-born cortical neurons.\",\n      \"evidence\": \"DAB1 F158V knock-in mouse, in vitro receptor peptide binding, dose-sensitive neuroanatomical analysis\",\n      \"pmids\": [\"15249135\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Subtle phenotype only in hemizygotes leaves quantitative receptor-binding threshold unclear\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Showed that alternative splicing generates DAB1 isoforms differing in Src-recognition tyrosines, coupling isoform choice to signaling competence.\",\n      \"evidence\": \"Chick retinal culture transfection, Src activation assays, Y198F mutagenesis\",\n      \"pmids\": [\"15057276\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab in chick system\", \"Splicing regulator not identified at this stage\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Separated PTB-domain phosphoinositide binding (membrane recruitment, basal phosphorylation) from receptor binding (Reelin-stimulated phosphorylation) as distinct mechanistic functions.\",\n      \"evidence\": \"Point mutations dissecting PTB activities, neuronal phosphorylation assays\",\n      \"pmids\": [\"16046028\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological balance of the two binding modes in vivo not quantified\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Reconstituted the full Reelin pathway in fibroblasts and showed lipid-raft localization is dispensable for DAB1 phosphorylation, with phospho-DAB1 remaining receptor-bound.\",\n      \"evidence\": \"Heterologous reconstitution, lipid raft fractionation, phosphorylation assays\",\n      \"pmids\": [\"16354676\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Conflicts with later DRM-association findings on raft role\", \"Heterologous system may not reflect neuronal context\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Revealed a phosphorylation-independent role for DAB1 in APP/ApoER2 trafficking, increasing surface receptor levels and shifting APP toward non-amyloidogenic processing.\",\n      \"evidence\": \"Reciprocal Co-IP, surface biotinylation, NPXY domain mapping, Reelin treatment in multiple cell systems\",\n      \"pmids\": [\"16951405\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo relevance to amyloid pathology not established\", \"Mechanism of surface stabilization not detailed\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Discovered CRM1-dependent nucleocytoplasmic shuttling of DAB1 with mapped NLS/NES, indicating a nuclear function independent of Reelin/Fyn signaling.\",\n      \"evidence\": \"Leptomycin B treatment, deletion mutants, in vitro CRM1/RanGTP binding, immunofluorescence\",\n      \"pmids\": [\"17062576\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of nuclear DAB1 unknown\", \"No nuclear binding partners identified\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Established Cullin5–SOCS-mediated proteasomal degradation of phospho-DAB1 as a negative-feedback brake on neuronal migration.\",\n      \"evidence\": \"Conditional Cul5 ablation in neurons, Cul5-SOCS-DAB1 complex biochemistry, DAB1 protein assays\",\n      \"pmids\": [\"17974915\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Which SOCS protein is principal in vivo not pinned down at this stage\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Extended the Src/Fyn→DAB1→CrkL pathway beyond cortex to sympathetic preganglionic neuron positioning in the spinal cord.\",\n      \"evidence\": \"Neuroanatomical analysis of dab1(5F/5F), src/fyn, and crkl knockout embryos\",\n      \"pmids\": [\"17394141\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"CrkL only partially required, implying additional effectors\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Showed Fyn-dependent, DAB1-potentiated APP surface localization and α-secretase processing, with in vivo confirmation in Fyn-null mice.\",\n      \"evidence\": \"Co-IP, FLIM, surface biotinylation, Fyn knockout mice\",\n      \"pmids\": [\"18089558\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Interplay between Fyn phosphorylation and the phosphorylation-independent APP effects unclear\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Genetically dissected DAB1 tyrosines into two functional pairs—Y198/Y200 (Akt/downregulation) and Y220/Y232 (Crk/C3G)—with distinct cortical phenotypes.\",\n      \"evidence\": \"Paired Tyr→Phe knock-in mice, complementation, Akt assays, Crk Co-IP, layering analysis\",\n      \"pmids\": [\"18981215\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How the two arms are integrated at the cellular level not resolved\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Identified activated protein C as a non-Reelin ligand activating DAB1 through ApoER2-specific binding and PI3K/Akt/GSK3β signaling.\",\n      \"evidence\": \"SPR binding, ApoER2 siRNA, PI3K inhibition, phosphorylation assays in U937 cells\",\n      \"pmids\": [\"19116273\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological/developmental context of APC-DAB1 signaling unclear\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Identified Pafah1b2 (Alpha2) as a phosphorylation-independent DAB1 partner that disrupts the DAB1-Lis1 complex, linking DAB1 to migration machinery.\",\n      \"evidence\": \"Co-IP from brain, cell-free binding, Alpha2 knockout mice\",\n      \"pmids\": [\"19272360\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Functional consequence of DAB1-Lis1 disruption in vivo not demonstrated\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Revealed a non-neuronal-migration role for DAB1 in astrocyte caveola-mediated albumin endocytosis feeding neurotrophic oleic acid synthesis.\",\n      \"evidence\": \"siRNA knockdown, albumin endocytosis and oleic acid assays, Co-IP with caveolin-1/megalin, EM\",\n      \"pmids\": [\"19656258\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Whether this requires DAB1 phosphorylation not tested\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Proved Cul5 controls layering solely through DAB1 degradation and quantified that DAB1 stabilization speeds migration by reducing stationary time.\",\n      \"evidence\": \"Stabilized DAB1 knock-in, Cul5 conditional KO, time-lapse migration imaging\",\n      \"pmids\": [\"20410119\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Spatial/temporal triggers of degradation during migration not resolved\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Showed DAB1 competes with Fe65 for APP binding and modulates APP-LRP1 complexes, refining the adaptor competition model for APP processing.\",\n      \"evidence\": \"Co-IP, competitive binding assays, APP processing measurements\",\n      \"pmids\": [\"20568118\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No mutagenesis of binding interface\", \"Single lab\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Defined DAB1 as cell-autonomously required for Rap1/cadherin-dependent somal translocation (not glia-guided locomotion), explaining its migration-mode specificity.\",\n      \"evidence\": \"Conditional KO, in utero electroporation, Rap1/cadherin assays, time-lapse imaging\",\n      \"pmids\": [\"21315259\", \"21697392\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which Rap1 controls cadherin during translocation incomplete\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Showed Fyn drives APP and DAB1 into detergent-resistant membranes where phospho-DAB1 concentrates, partially contradicting the raft-independence model.\",\n      \"evidence\": \"DRM fractionation from WT and Fyn KO mice, Co-IP, Reelin treatment\",\n      \"pmids\": [\"21534960\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Reconciliation with reconstitution data (idx 10) unresolved\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Demonstrated an adult-brain function of DAB1 in synaptic plasticity and hippocampal learning via Akt/ERK signaling, separable from its developmental positioning role.\",\n      \"evidence\": \"Forebrain-specific conditional KO, behavior, electrophysiology, spine morphology, phospho-Akt/ERK assays\",\n      \"pmids\": [\"24068831\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Upstream ligand/receptor for adult synaptic DAB1 signaling not defined\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Placed DAB1 at a node of VEGF-Reelin crosstalk through Flk1-ApoER2 association and NR2B activation.\",\n      \"evidence\": \"Co-IP, Flk1 inhibition, DAB1 knockdown, reeler neuron rescue\",\n      \"pmids\": [\"23916658\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Physiological setting of VEGF-Reelin crosstalk unclear\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Identified CIN85 as a phosphorylation-sensitive DAB1 partner coupling ApoER2/DAB1 to endosomal trafficking after Reelin.\",\n      \"evidence\": \"Co-IP, immunofluorescence with endosomal markers, Reelin stimulation\",\n      \"pmids\": [\"23506116\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Functional outcome of endosomal recruitment not established\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Revealed an oncogenic DAB1 axis in colorectal cancer: NOTCH-induced DAB1 reciprocally activates ABL, which phosphorylates TRIO to drive RHO-dependent invasion.\",\n      \"evidence\": \"In vivo DAB1 depletion in polyposis mice, ABL inhibition, TRIO Y2681 mutants, GEF and invasion assays\",\n      \"pmids\": [\"25432929\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relationship of this ABL/TRIO arm to canonical Reelin signaling unclear\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Connected mTORC1 hyperactivation to DAB1 destabilization via Cul5 upregulation, providing a mechanism for migration defects in tuberous sclerosis.\",\n      \"evidence\": \"TSC mouse models, patient tubers, Rheb overexpression, rapamycin, Cul5 knockdown, phospho-DAB1 blots\",\n      \"pmids\": [\"26235615\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct transcriptional vs post-transcriptional control of Cul5 by mTORC1 not fully defined\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Showed via optogenetics that DAB1 activation alone is sufficient to orient cell movement and control membrane dynamics.\",\n      \"evidence\": \"Cry2-based opto-DAB1, live imaging in COS7 and neurons, downstream signaling assays\",\n      \"pmids\": [\"28272509\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab gain-of-function\", \"Does not establish endogenous spatiotemporal regulation\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Established DCC/Netrin-1 as an additional receptor system activating DAB1 (Y220/Y232 phosphorylation) to drive the multipolar-to-bipolar transition.\",\n      \"evidence\": \"Co-IP domain mapping, in vivo knockdown, rescue with phospho-mimetic DAB1 and constitutively active Fyn\",\n      \"pmids\": [\"29590626\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cross-talk between DCC and Reelin receptor inputs not resolved\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Demonstrated a vascular/endothelial role for DAB1 in CNS angiogenesis controlling laminin-α4 secretion and integrin-β1 activation that feeds back on neuronal migration and BBB integrity.\",\n      \"evidence\": \"Endothelial-specific conditional KO, vascularization analysis, laminin secretion and integrin activation assays\",\n      \"pmids\": [\"30139844\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Endothelial DAB1 effector pathway downstream not fully mapped\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Showed RBM4-controlled alternative splicing producing full-length DAB1 (exons 7/8) is required for cortical neuronal migration, in opposition to PTBP1.\",\n      \"evidence\": \"RIP-seq, Rbm4a KO brain, in vivo knockdown, isoform-specific rescue\",\n      \"pmids\": [\"29581187\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How splice variation tunes signaling output quantitatively not detailed\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Identified ZSWIM8 as a protein-quality-control ligase that recognizes DAB1 intrinsically disordered regions to clear misfolded DAB1, with KO causing migration and spine defects.\",\n      \"evidence\": \"Conditional Zswim8 KO, CRISPR KO neurons, ZSWIM8-DAB1 interaction and ubiquitination assays, morphology\",\n      \"pmids\": [\"35989311\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Distinction from Cul5-mediated phospho-dependent degradation not fully delineated\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Identified TRIM40 as an E3 ligase promoting K48 polyubiquitination and degradation of DAB1, limiting Reelin/DAB1-driven inflammation in diabetic retinopathy.\",\n      \"evidence\": \"Co-IP, K48 ubiquitination assay, TRIM40 overexpression, AAV-TRIM40 in vivo\",\n      \"pmids\": [\"37146559\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Whether degradation is phosphorylation-dependent untested\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Showed SMARCD3-mediated chromatin remodeling at the DAB1 locus activates Reelin-DAB1-Src signaling to drive medulloblastoma metastasis, nominating Src inhibition.\",\n      \"evidence\": \"ATAC/ChIP-seq, SMARCD3 manipulation, Src activation assays and inhibitor response in MB models\",\n      \"pmids\": [\"36849558\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Direct cis-element to DAB1 regulatory link not fully resolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The function of nuclear DAB1 and how its multiple degradation routes (Cul5, ZSWIM8, TRIM40) are coordinated spatiotemporally during migration and in disease remain unresolved.\",\n      \"evidence\": \"No direct experimental resolution in the available corpus\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No nuclear binding partner or nuclear function identified\", \"Coordination/hierarchy among E3 ligases unknown\", \"Integration of multiple receptor inputs (Reelin, DCC, APC, VEGF) onto shared DAB1 outputs unclear\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [6, 7, 11, 2]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [6]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [8]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [8]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [6, 27]},\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [27]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [1, 2, 14, 18]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [0, 11, 12, 15]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [4, 5, 29, 30]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [17, 20, 34]}\n    ],\n    \"complexes\": [\"Cul5-SOCS E3 ubiquitin ligase complex\"],\n    \"partners\": [\"VLDLR\", \"LRP8\", \"FYN\", \"PIK3R1\", \"CRKL\", \"APP\", \"DCC\", \"CUL5\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":9,"faith_total":9,"faith_pct":100.0}}