{"gene":"DENND2B","run_date":"2026-06-09T23:54:42","timeline":{"discoveries":[{"year":2015,"finding":"DENND2B was identified as the guanine nucleotide exchange factor (GEF) for Rab13. Using a FRET-based Rab biosensor, DENND2B was shown to activate Rab13 specifically at the leading edge of migrating cells. DENND2B interacts with the Rab13 effector MICAL-L2 at the cell periphery, and this interaction is required for dynamic remodeling of the cell's leading edge. Disruption of Rab13-mediated trafficking dramatically limits the invasive behavior of epithelial cells in vitro and the growth and migration of highly invasive cancer cells in vivo.","method":"FRET-based Rab biosensor, Co-immunoprecipitation, in vitro GEF assay, knockdown with invasion/migration phenotypic readout, in vivo xenograft","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — GEF activity demonstrated biochemically, FRET biosensor for spatial activation, reciprocal interaction with effector, multiple orthogonal methods in one study with in vivo validation","pmids":["25713415"],"is_preprint":false},{"year":2017,"finding":"DENND2B binds to intersectin-s (a multi-domain adaptor protein required for EGFR internalization), and this interaction promotes recycling of ligand-free EGFR to the cell surface. Upon EGF treatment, DENND2B is phosphorylated by protein kinase D (PKD), causing it to dissociate from intersectin-s and allowing EGFR to be targeted for lysosomal degradation rather than recycling.","method":"Co-immunoprecipitation, phosphorylation assay (PKD), EGFR trafficking assay, knockdown with receptor fate readout","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP, identification of PKD as kinase, functional consequence on EGFR fate established with multiple methods in single study","pmids":["29030480"],"is_preprint":false},{"year":2022,"finding":"Using a cellular GEF assay screening all 60 Rabs against DENN domain proteins, DENND2B was found to act as a GEF for Rab10 in addition to Rab13. Through activation of Rab10, DENND2B represses the formation of primary cilia. Additionally, DENND2B functions as a GEF for RhoA (a non-Rab substrate), controlling the length of primary cilia through a second pathway.","method":"Cell-based GEF assay (systematic screen of 60 Rabs), ciliogenesis assay, knockdown with phenotypic readout, RhoA GEF activity assay","journal":"Science advances","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — systematic cellular GEF assay with functional validation of novel substrates (Rab10, RhoA), two orthogonal mechanistic pathways identified, single lab but rigorous methods","pmids":["35196081"],"is_preprint":false},{"year":2023,"finding":"DENND2B functions as a GEF for Rab35 at the intercellular cytokinetic bridge (ICB). DENND2B's N-terminal region also interacts with the active (GTP-bound) form of Rab35, indicating DENND2B acts as both a Rab35 GEF and effector. Knockdown of DENND2B delays cytokinetic abscission, leading to multinucleated cells, filamentous actin (F-actin) accumulation at the ICB, impaired ESCRT-III recruitment at the abscission site, chromatin bridge formation, and activation of the NoCut/abscission checkpoint (Aurora B kinase activation).","method":"GEF assay, Co-immunoprecipitation (active Rab35 pulldown), siRNA knockdown with cytokinesis phenotype readout (multinucleation, F-actin, ESCRT-III localization, Aurora B activity), live-cell imaging","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — in vitro GEF assay combined with effector binding assay, KD with multiple specific cellular phenotype readouts, single lab with multiple orthogonal methods","pmids":["37454296"],"is_preprint":false},{"year":1998,"finding":"The human ST5 gene encodes three proteins (p126, p82, p70). The largest protein, p126, binds preferentially to c-Abl SH3 domain via its PR2 proline-rich sequence in vitro. In COS-7 cells, expression of p126 (but not p82 or p70) activates MAPK/ERK2 in response to EGF; co-expression with c-Abl greatly enhances this activity. Deletion of PR1 blocks ERK2 activation by p126; deletion of PR2 blocks the stimulatory effect of c-Abl. p70 completely abrogates ERK2 activation by p126.","method":"In vitro SH3 binding assay, transient transfection with ERK2 activity assay, deletion mutagenesis","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro binding plus cell-based kinase activity assay with deletion mutants; single lab, two complementary methods","pmids":["9632734"],"is_preprint":false},{"year":2000,"finding":"The ST5 p70 isoform suppresses ERK2/MAPK activation. C-terminal deletions of p70 (p70-ΔC1 and p70-ΔC2) convert it from an inhibitor to a constitutive activator of the RAS-ERK2 pathway in a growth-factor-independent manner. This activation is completely blocked by dominant-negative RAS17N or MEKAA, placing p70 upstream of RAS. The C-terminal region (residues 489–609) contains critical determinants for p70's inhibitory function.","method":"Transient transfection, ERK2 activity assay, dominant-negative epistasis (RAS17N, MEKAA), deletion mutagenesis, NIH-3T3 transformation assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — epistasis with dominant-negative mutants plus deletion analysis and transformation assay; single lab with multiple complementary methods","pmids":["10692462"],"is_preprint":false},{"year":1996,"finding":"Differential expression of the ST5 2.8 kb mRNA (encoding p70) in non-tumorigenic HeLa-fibroblast hybrids is controlled by an intronic promoter and an upstream enhancer containing AP1 and YY1 binding sites. YY1 DNA-binding activity is up to 6-fold higher in non-tumorigenic cells relative to tumorigenic cells, and mutational analysis of five YY1 sites shows they are necessary for full enhancer activity driving the p70-encoding transcript.","method":"Mutational analysis of enhancer, reporter gene assay, electrophoretic mobility shift assay (EMSA) for YY1 and AP1 binding","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reporter assay with mutagenesis and EMSA; single lab but two orthogonal methods","pmids":["8972856"],"is_preprint":false},{"year":1999,"finding":"ST5 p70 expression specifically in non-tumorigenic HeLa-fibroblast hybrid cells correlates with a flattened morphology. Stable transfection of p70 cDNA into p70-negative mouse fibroblasts produced cells with flattened, less refractile morphology and reduced saturation density (threefold), restoring contact-regulated growth, providing direct evidence that p70 effects changes in cell growth and morphology.","method":"Stable transfection, morphological analysis, growth curve and saturation density assay, Western blotting for protein detection","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — stable transfection with morphological and proliferation phenotype readout; single lab, single primary method","pmids":["10229203"],"is_preprint":false},{"year":2009,"finding":"Disruption of ST5 by a chromosomal translocation breakpoint is associated with severe mental retardation, muscular hypotonia, seizures, and multiple congenital anomalies in a patient. ST5 mRNA was found to be expressed in fetal tissues and elevated in adult brain, kidney, and muscle; in situ hybridization in mouse showed expression in frontal cortex during embryonic development and high expression in hippocampus and cerebellum in adult brain, implicating ST5 in CNS development.","method":"FISH mapping of translocation breakpoints, sequencing of breakpoints, quantitative PCR from human tissues, RNA in situ hybridization in mouse","journal":"Journal of medical genetics","confidence":"Low","confidence_rationale":"Tier 3 / Weak — localization by in situ hybridization without direct functional experiments; association of disruption with phenotype in single patient","pmids":["19843505"],"is_preprint":false},{"year":2019,"finding":"ST5 is upregulated by RANKL (osteoclast differentiation factor) in osteoclast precursors. Knockdown of ST5 by siRNA reduced osteoclast (OC) differentiation and decreased NFATc1 expression. ST5 protein co-localizes with Src in RANKL-committed cells. ST5 enhanced activation of Src and Syk (a Src substrate) in response to RANKL, and ST5 reduction decreased RANKL-evoked calcium oscillation and inhibited nuclear translocation of NFATc1. Overexpression of ST5 had the opposite phenotype.","method":"siRNA knockdown, overexpression, immunocytochemistry (co-localization with Src), Western blot (Src/Syk phosphorylation), calcium oscillation measurement, NFATc1 nuclear translocation assay","journal":"Molecules and cells","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss- and gain-of-function with multiple downstream signaling readouts (Src, Syk, calcium, NFATc1); single lab with several orthogonal assays","pmids":["31707778"],"is_preprint":false},{"year":2026,"finding":"Monoallelic variants in DENND2B cause a neurodevelopmental disorder with intellectual disability, psychosis/catatonia, epilepsy, and congenital anomalies. Nine of ten patient variants were modelled in zebrafish and confirmed to result in loss of DENND2B function, validating the pathogenicity of the identified variants.","method":"In silico prediction, structural modelling, in vivo zebrafish loss-of-function modelling of patient variants","journal":"Brain : a journal of neurology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo zebrafish functional validation of 9 variants demonstrating loss of function; single study but systematic variant modelling","pmids":["40717498"],"is_preprint":false}],"current_model":"DENND2B (also known as ST5/p126) is a multi-substrate DENN domain-containing guanine nucleotide exchange factor (GEF) that activates Rab13 at the leading edge of migrating cells to promote exocytic trafficking and cancer cell invasion, activates Rab35 at the intercellular cytokinetic bridge to recruit MICAL1 and drive actin depolymerization for abscission, activates Rab10 to repress primary ciliogenesis, and activates RhoA to control primary cilia length; additionally, DENND2B interacts with intersectin-s to promote EGFR recycling, but upon EGF stimulation is phosphorylated by protein kinase D causing its dissociation from intersectin-s and redirecting EGFR to lysosomal degradation; the p126 isoform also binds c-Abl via a proline-rich SH3-binding motif and activates ERK2/MAPK signaling upstream of RAS, while the p70 isoform acts as an inhibitor of this pathway whose C-terminal domain is essential for its suppressive function."},"narrative":{"mechanistic_narrative":"DENND2B (ST5/p126) is a multi-substrate DENN-domain guanine nucleotide exchange factor (GEF) that spatially controls Rab and Rho GTPase signaling to direct membrane trafficking, cell migration, ciliogenesis, and cytokinesis [PMID:25713415, PMID:35196081, PMID:37454296]. It activates Rab13 specifically at the leading edge of migrating cells, where it engages the Rab13 effector MICAL-L2 to remodel the cell periphery and drive epithelial invasion and tumor cell migration in vivo [PMID:25713415]. A systematic GEF screen established that DENND2B additionally activates Rab10 to repress primary cilium formation and acts as a GEF for the non-Rab substrate RhoA to control cilium length, thereby coupling its catalytic activity to two parallel ciliogenesis pathways [PMID:35196081]. At the intercellular cytokinetic bridge DENND2B serves as both GEF and effector for Rab35, and its loss delays abscission, producing F-actin accumulation, impaired ESCRT-III recruitment, chromatin bridges, multinucleation, and Aurora B/NoCut checkpoint activation [PMID:37454296]. DENND2B also binds the endocytic adaptor intersectin-s to promote recycling of ligand-free EGFR; EGF-triggered phosphorylation by protein kinase D dissociates this complex and redirects EGFR to lysosomal degradation [PMID:29030480]. The largest ST5 isoform, p126, binds the c-Abl SH3 domain through a proline-rich motif and activates ERK2/MAPK upstream of RAS, whereas the p70 isoform suppresses this pathway via a C-terminal inhibitory region and restores contact-regulated, flattened growth phenotypes [PMID:9632734, PMID:10692462, PMID:10229203]. Monoallelic DENND2B variants cause a neurodevelopmental disorder with intellectual disability, epilepsy, and congenital anomalies, with patient variants confirmed as loss-of-function in zebrafish [PMID:40717498].","teleology":[{"year":1996,"claim":"Established how expression of the ST5 p70-encoding transcript is transcriptionally controlled, linking its loss to the tumorigenic state.","evidence":"Reporter assays with enhancer mutagenesis and EMSA for YY1/AP1 binding in HeLa-fibroblast hybrids","pmids":["8972856"],"confidence":"Medium","gaps":["Does not define the protein function of p70","Mechanism connecting YY1 activity to tumorigenicity unresolved"]},{"year":1998,"claim":"Defined the ST5 isoforms and showed the largest, p126, binds c-Abl and activates ERK2/MAPK, identifying an isoform-specific signaling role.","evidence":"In vitro SH3 binding, transient transfection ERK2 assays, and deletion mutagenesis in COS-7 cells","pmids":["9632734"],"confidence":"Medium","gaps":["Direct enzymatic activity of p126 not defined","Physiological relevance of c-Abl interaction not tested in vivo"]},{"year":1999,"claim":"Demonstrated that p70 expression alone is sufficient to restore non-transformed cell morphology and contact-regulated growth, establishing a tumor-suppressive cellular phenotype.","evidence":"Stable transfection of p70 into p70-negative fibroblasts with morphology and saturation density readouts","pmids":["10229203"],"confidence":"Medium","gaps":["Molecular mechanism of growth suppression not defined","Single primary phenotypic method"]},{"year":2000,"claim":"Placed p70 upstream of RAS in MAPK signaling and mapped its C-terminal inhibitory determinant, explaining the opposing activities of ST5 isoforms.","evidence":"Dominant-negative epistasis (RAS17N, MEKAA), deletion mutagenesis, and NIH-3T3 transformation assays","pmids":["10692462"],"confidence":"Medium","gaps":["Direct molecular target of p70 in the RAS pathway unidentified","Structural basis of C-terminal inhibition unknown"]},{"year":2009,"claim":"Linked ST5 disruption to a CNS phenotype and characterized its expression in developing and adult brain, raising a neurodevelopmental role.","evidence":"FISH/sequencing of translocation breakpoints in a patient plus qPCR and in situ hybridization expression mapping","pmids":["19843505"],"confidence":"Low","gaps":["Association rests on a single patient with a translocation, not direct functional proof","No mechanism connecting ST5 loss to neural phenotypes"]},{"year":2015,"claim":"Identified DENND2B as the Rab13 GEF and localized its activity to the leading edge, defining its role in trafficking-driven migration and invasion.","evidence":"FRET Rab biosensor, in vitro GEF assay, MICAL-L2 Co-IP, and knockdown invasion/migration with in vivo xenograft validation","pmids":["25713415"],"confidence":"High","gaps":["Structural basis of substrate specificity not resolved","Upstream regulators of leading-edge recruitment not defined"]},{"year":2017,"claim":"Connected DENND2B to receptor trafficking by showing it binds intersectin-s to recycle EGFR, and that PKD phosphorylation switches receptor fate toward degradation.","evidence":"Reciprocal Co-IP, PKD phosphorylation assay, and EGFR trafficking/knockdown readouts","pmids":["29030480"],"confidence":"High","gaps":["PKD phosphorylation sites on DENND2B not mapped","Whether GEF activity is required for the recycling function not established"]},{"year":2022,"claim":"Expanded DENND2B's substrate repertoire to Rab10 and RhoA and assigned distinct ciliary functions, showing one GEF coordinates parallel pathways.","evidence":"Systematic cellular GEF screen of 60 Rabs, RhoA GEF assay, and ciliogenesis knockdown phenotypes","pmids":["35196081"],"confidence":"High","gaps":["How DENND2B selects between Rab and Rho substrates is unknown","Spatial regulation of the two ciliary pathways unresolved"]},{"year":2023,"claim":"Demonstrated dual GEF/effector function toward Rab35 at the cytokinetic bridge, establishing a requirement for DENND2B in actin clearance and abscission.","evidence":"GEF assay, active-Rab35 pulldown, and siRNA knockdown with multinucleation, F-actin, ESCRT-III, and Aurora B readouts plus live imaging","pmids":["37454296"],"confidence":"High","gaps":["How GEF and effector roles are temporally coordinated at the bridge unclear","Direct link between Rab35 activation and ESCRT-III recruitment mechanism not fully defined"]},{"year":2026,"claim":"Established DENND2B as the cause of a monoallelic neurodevelopmental disorder, connecting its loss of function to human disease.","evidence":"Patient variant identification with in vivo zebrafish loss-of-function modelling of nine variants","pmids":["40717498"],"confidence":"Medium","gaps":["Which GTPase pathway(s) underlie the neurodevelopmental phenotype not determined","Genotype-phenotype correlations across variants not resolved"]},{"year":null,"claim":"How DENND2B integrates its multiple GTPase substrates, isoform-specific MAPK roles, and EGFR trafficking into the neurodevelopmental disease mechanism remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model explaining multi-substrate specificity","Disease-relevant substrate(s) in neural cells not identified","Relationship between DENN GEF activity and isoform-specific MAPK modulation unclear"]}],"mechanism_profile":{"molecular_activity":[],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[3]}],"pathway":[{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[0,1]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[3]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[4,5,9]},{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[2]}],"complexes":[],"partners":["RAB13","MICAL-L2","RAB35","RAB10","RHOA","ITSN1","ABL1","SRC"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P78524","full_name":"DENN domain-containing protein 2B","aliases":["HeLa tumor suppression 1","Suppression of tumorigenicity 5 protein"],"length_aa":1137,"mass_kda":126.5,"function":"May be involved in cytoskeletal organization and tumorogenicity. Seems to be involved in a signaling transduction pathway leading to activation of MAPK1/ERK2. Plays a role in EGFR trafficking from recycling endosomes back to the cell membrane (PubMed:29030480) Guanine nucleotide exchange factor (GEF) which may activate RAB9A and RAB9B. Promotes the exchange of GDP to GTP, converting inactive GDP-bound Rab proteins into their active GTP-bound form May block ERK2 activation stimulated by ABL1 (Probable). May alter cell morphology and cell growth (Probable)","subcellular_location":"Cytoplasm, cell cortex; Cell membrane; Recycling endosome","url":"https://www.uniprot.org/uniprotkb/P78524/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/DENND2B","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/DENND2B","total_profiled":1310},"omim":[],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/DENND2B"},"hgnc":{"alias_symbol":["HTS1","p126"],"prev_symbol":["ST5"]},"alphafold":{"accession":"P78524","domains":[{"cath_id":"3.30.450.200","chopping":"679-871","consensus_level":"medium","plddt":83.6266,"start":679,"end":871}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P78524","model_url":"https://alphafold.ebi.ac.uk/files/AF-P78524-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P78524-F1-predicted_aligned_error_v6.png","plddt_mean":57.97},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=DENND2B","jax_strain_url":"https://www.jax.org/strain/search?query=DENND2B"},"sequence":{"accession":"P78524","fasta_url":"https://rest.uniprot.org/uniprotkb/P78524.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P78524/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P78524"}},"corpus_meta":[{"pmid":"3521891","id":"PMC_3521891","title":"The HTS1 gene 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\"finding\": \"DENND2B was identified as the guanine nucleotide exchange factor (GEF) for Rab13. Using a FRET-based Rab biosensor, DENND2B was shown to activate Rab13 specifically at the leading edge of migrating cells. DENND2B interacts with the Rab13 effector MICAL-L2 at the cell periphery, and this interaction is required for dynamic remodeling of the cell's leading edge. Disruption of Rab13-mediated trafficking dramatically limits the invasive behavior of epithelial cells in vitro and the growth and migration of highly invasive cancer cells in vivo.\",\n      \"method\": \"FRET-based Rab biosensor, Co-immunoprecipitation, in vitro GEF assay, knockdown with invasion/migration phenotypic readout, in vivo xenograft\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — GEF activity demonstrated biochemically, FRET biosensor for spatial activation, reciprocal interaction with effector, multiple orthogonal methods in one study with in vivo validation\",\n      \"pmids\": [\"25713415\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"DENND2B binds to intersectin-s (a multi-domain adaptor protein required for EGFR internalization), and this interaction promotes recycling of ligand-free EGFR to the cell surface. Upon EGF treatment, DENND2B is phosphorylated by protein kinase D (PKD), causing it to dissociate from intersectin-s and allowing EGFR to be targeted for lysosomal degradation rather than recycling.\",\n      \"method\": \"Co-immunoprecipitation, phosphorylation assay (PKD), EGFR trafficking assay, knockdown with receptor fate readout\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP, identification of PKD as kinase, functional consequence on EGFR fate established with multiple methods in single study\",\n      \"pmids\": [\"29030480\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Using a cellular GEF assay screening all 60 Rabs against DENN domain proteins, DENND2B was found to act as a GEF for Rab10 in addition to Rab13. Through activation of Rab10, DENND2B represses the formation of primary cilia. Additionally, DENND2B functions as a GEF for RhoA (a non-Rab substrate), controlling the length of primary cilia through a second pathway.\",\n      \"method\": \"Cell-based GEF assay (systematic screen of 60 Rabs), ciliogenesis assay, knockdown with phenotypic readout, RhoA GEF activity assay\",\n      \"journal\": \"Science advances\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — systematic cellular GEF assay with functional validation of novel substrates (Rab10, RhoA), two orthogonal mechanistic pathways identified, single lab but rigorous methods\",\n      \"pmids\": [\"35196081\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"DENND2B functions as a GEF for Rab35 at the intercellular cytokinetic bridge (ICB). DENND2B's N-terminal region also interacts with the active (GTP-bound) form of Rab35, indicating DENND2B acts as both a Rab35 GEF and effector. Knockdown of DENND2B delays cytokinetic abscission, leading to multinucleated cells, filamentous actin (F-actin) accumulation at the ICB, impaired ESCRT-III recruitment at the abscission site, chromatin bridge formation, and activation of the NoCut/abscission checkpoint (Aurora B kinase activation).\",\n      \"method\": \"GEF assay, Co-immunoprecipitation (active Rab35 pulldown), siRNA knockdown with cytokinesis phenotype readout (multinucleation, F-actin, ESCRT-III localization, Aurora B activity), live-cell imaging\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro GEF assay combined with effector binding assay, KD with multiple specific cellular phenotype readouts, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"37454296\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"The human ST5 gene encodes three proteins (p126, p82, p70). The largest protein, p126, binds preferentially to c-Abl SH3 domain via its PR2 proline-rich sequence in vitro. In COS-7 cells, expression of p126 (but not p82 or p70) activates MAPK/ERK2 in response to EGF; co-expression with c-Abl greatly enhances this activity. Deletion of PR1 blocks ERK2 activation by p126; deletion of PR2 blocks the stimulatory effect of c-Abl. p70 completely abrogates ERK2 activation by p126.\",\n      \"method\": \"In vitro SH3 binding assay, transient transfection with ERK2 activity assay, deletion mutagenesis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro binding plus cell-based kinase activity assay with deletion mutants; single lab, two complementary methods\",\n      \"pmids\": [\"9632734\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"The ST5 p70 isoform suppresses ERK2/MAPK activation. C-terminal deletions of p70 (p70-ΔC1 and p70-ΔC2) convert it from an inhibitor to a constitutive activator of the RAS-ERK2 pathway in a growth-factor-independent manner. This activation is completely blocked by dominant-negative RAS17N or MEKAA, placing p70 upstream of RAS. The C-terminal region (residues 489–609) contains critical determinants for p70's inhibitory function.\",\n      \"method\": \"Transient transfection, ERK2 activity assay, dominant-negative epistasis (RAS17N, MEKAA), deletion mutagenesis, NIH-3T3 transformation assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — epistasis with dominant-negative mutants plus deletion analysis and transformation assay; single lab with multiple complementary methods\",\n      \"pmids\": [\"10692462\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"Differential expression of the ST5 2.8 kb mRNA (encoding p70) in non-tumorigenic HeLa-fibroblast hybrids is controlled by an intronic promoter and an upstream enhancer containing AP1 and YY1 binding sites. YY1 DNA-binding activity is up to 6-fold higher in non-tumorigenic cells relative to tumorigenic cells, and mutational analysis of five YY1 sites shows they are necessary for full enhancer activity driving the p70-encoding transcript.\",\n      \"method\": \"Mutational analysis of enhancer, reporter gene assay, electrophoretic mobility shift assay (EMSA) for YY1 and AP1 binding\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reporter assay with mutagenesis and EMSA; single lab but two orthogonal methods\",\n      \"pmids\": [\"8972856\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"ST5 p70 expression specifically in non-tumorigenic HeLa-fibroblast hybrid cells correlates with a flattened morphology. Stable transfection of p70 cDNA into p70-negative mouse fibroblasts produced cells with flattened, less refractile morphology and reduced saturation density (threefold), restoring contact-regulated growth, providing direct evidence that p70 effects changes in cell growth and morphology.\",\n      \"method\": \"Stable transfection, morphological analysis, growth curve and saturation density assay, Western blotting for protein detection\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — stable transfection with morphological and proliferation phenotype readout; single lab, single primary method\",\n      \"pmids\": [\"10229203\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Disruption of ST5 by a chromosomal translocation breakpoint is associated with severe mental retardation, muscular hypotonia, seizures, and multiple congenital anomalies in a patient. ST5 mRNA was found to be expressed in fetal tissues and elevated in adult brain, kidney, and muscle; in situ hybridization in mouse showed expression in frontal cortex during embryonic development and high expression in hippocampus and cerebellum in adult brain, implicating ST5 in CNS development.\",\n      \"method\": \"FISH mapping of translocation breakpoints, sequencing of breakpoints, quantitative PCR from human tissues, RNA in situ hybridization in mouse\",\n      \"journal\": \"Journal of medical genetics\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — localization by in situ hybridization without direct functional experiments; association of disruption with phenotype in single patient\",\n      \"pmids\": [\"19843505\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"ST5 is upregulated by RANKL (osteoclast differentiation factor) in osteoclast precursors. Knockdown of ST5 by siRNA reduced osteoclast (OC) differentiation and decreased NFATc1 expression. ST5 protein co-localizes with Src in RANKL-committed cells. ST5 enhanced activation of Src and Syk (a Src substrate) in response to RANKL, and ST5 reduction decreased RANKL-evoked calcium oscillation and inhibited nuclear translocation of NFATc1. Overexpression of ST5 had the opposite phenotype.\",\n      \"method\": \"siRNA knockdown, overexpression, immunocytochemistry (co-localization with Src), Western blot (Src/Syk phosphorylation), calcium oscillation measurement, NFATc1 nuclear translocation assay\",\n      \"journal\": \"Molecules and cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss- and gain-of-function with multiple downstream signaling readouts (Src, Syk, calcium, NFATc1); single lab with several orthogonal assays\",\n      \"pmids\": [\"31707778\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"Monoallelic variants in DENND2B cause a neurodevelopmental disorder with intellectual disability, psychosis/catatonia, epilepsy, and congenital anomalies. Nine of ten patient variants were modelled in zebrafish and confirmed to result in loss of DENND2B function, validating the pathogenicity of the identified variants.\",\n      \"method\": \"In silico prediction, structural modelling, in vivo zebrafish loss-of-function modelling of patient variants\",\n      \"journal\": \"Brain : a journal of neurology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo zebrafish functional validation of 9 variants demonstrating loss of function; single study but systematic variant modelling\",\n      \"pmids\": [\"40717498\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"DENND2B (also known as ST5/p126) is a multi-substrate DENN domain-containing guanine nucleotide exchange factor (GEF) that activates Rab13 at the leading edge of migrating cells to promote exocytic trafficking and cancer cell invasion, activates Rab35 at the intercellular cytokinetic bridge to recruit MICAL1 and drive actin depolymerization for abscission, activates Rab10 to repress primary ciliogenesis, and activates RhoA to control primary cilia length; additionally, DENND2B interacts with intersectin-s to promote EGFR recycling, but upon EGF stimulation is phosphorylated by protein kinase D causing its dissociation from intersectin-s and redirecting EGFR to lysosomal degradation; the p126 isoform also binds c-Abl via a proline-rich SH3-binding motif and activates ERK2/MAPK signaling upstream of RAS, while the p70 isoform acts as an inhibitor of this pathway whose C-terminal domain is essential for its suppressive function.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"DENND2B (ST5/p126) is a multi-substrate DENN-domain guanine nucleotide exchange factor (GEF) that spatially controls Rab and Rho GTPase signaling to direct membrane trafficking, cell migration, ciliogenesis, and cytokinesis [#0, #2, #3]. It activates Rab13 specifically at the leading edge of migrating cells, where it engages the Rab13 effector MICAL-L2 to remodel the cell periphery and drive epithelial invasion and tumor cell migration in vivo [#0]. A systematic GEF screen established that DENND2B additionally activates Rab10 to repress primary cilium formation and acts as a GEF for the non-Rab substrate RhoA to control cilium length, thereby coupling its catalytic activity to two parallel ciliogenesis pathways [#2]. At the intercellular cytokinetic bridge DENND2B serves as both GEF and effector for Rab35, and its loss delays abscission, producing F-actin accumulation, impaired ESCRT-III recruitment, chromatin bridges, multinucleation, and Aurora B/NoCut checkpoint activation [#3]. DENND2B also binds the endocytic adaptor intersectin-s to promote recycling of ligand-free EGFR; EGF-triggered phosphorylation by protein kinase D dissociates this complex and redirects EGFR to lysosomal degradation [#1]. The largest ST5 isoform, p126, binds the c-Abl SH3 domain through a proline-rich motif and activates ERK2/MAPK upstream of RAS, whereas the p70 isoform suppresses this pathway via a C-terminal inhibitory region and restores contact-regulated, flattened growth phenotypes [#4, #5, #7]. Monoallelic DENND2B variants cause a neurodevelopmental disorder with intellectual disability, epilepsy, and congenital anomalies, with patient variants confirmed as loss-of-function in zebrafish [#10].\",\n  \"teleology\": [\n    {\n      \"year\": 1996,\n      \"claim\": \"Established how expression of the ST5 p70-encoding transcript is transcriptionally controlled, linking its loss to the tumorigenic state.\",\n      \"evidence\": \"Reporter assays with enhancer mutagenesis and EMSA for YY1/AP1 binding in HeLa-fibroblast hybrids\",\n      \"pmids\": [\"8972856\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Does not define the protein function of p70\", \"Mechanism connecting YY1 activity to tumorigenicity unresolved\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Defined the ST5 isoforms and showed the largest, p126, binds c-Abl and activates ERK2/MAPK, identifying an isoform-specific signaling role.\",\n      \"evidence\": \"In vitro SH3 binding, transient transfection ERK2 assays, and deletion mutagenesis in COS-7 cells\",\n      \"pmids\": [\"9632734\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct enzymatic activity of p126 not defined\", \"Physiological relevance of c-Abl interaction not tested in vivo\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Demonstrated that p70 expression alone is sufficient to restore non-transformed cell morphology and contact-regulated growth, establishing a tumor-suppressive cellular phenotype.\",\n      \"evidence\": \"Stable transfection of p70 into p70-negative fibroblasts with morphology and saturation density readouts\",\n      \"pmids\": [\"10229203\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular mechanism of growth suppression not defined\", \"Single primary phenotypic method\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Placed p70 upstream of RAS in MAPK signaling and mapped its C-terminal inhibitory determinant, explaining the opposing activities of ST5 isoforms.\",\n      \"evidence\": \"Dominant-negative epistasis (RAS17N, MEKAA), deletion mutagenesis, and NIH-3T3 transformation assays\",\n      \"pmids\": [\"10692462\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct molecular target of p70 in the RAS pathway unidentified\", \"Structural basis of C-terminal inhibition unknown\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Linked ST5 disruption to a CNS phenotype and characterized its expression in developing and adult brain, raising a neurodevelopmental role.\",\n      \"evidence\": \"FISH/sequencing of translocation breakpoints in a patient plus qPCR and in situ hybridization expression mapping\",\n      \"pmids\": [\"19843505\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Association rests on a single patient with a translocation, not direct functional proof\", \"No mechanism connecting ST5 loss to neural phenotypes\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Identified DENND2B as the Rab13 GEF and localized its activity to the leading edge, defining its role in trafficking-driven migration and invasion.\",\n      \"evidence\": \"FRET Rab biosensor, in vitro GEF assay, MICAL-L2 Co-IP, and knockdown invasion/migration with in vivo xenograft validation\",\n      \"pmids\": [\"25713415\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of substrate specificity not resolved\", \"Upstream regulators of leading-edge recruitment not defined\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Connected DENND2B to receptor trafficking by showing it binds intersectin-s to recycle EGFR, and that PKD phosphorylation switches receptor fate toward degradation.\",\n      \"evidence\": \"Reciprocal Co-IP, PKD phosphorylation assay, and EGFR trafficking/knockdown readouts\",\n      \"pmids\": [\"29030480\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"PKD phosphorylation sites on DENND2B not mapped\", \"Whether GEF activity is required for the recycling function not established\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Expanded DENND2B's substrate repertoire to Rab10 and RhoA and assigned distinct ciliary functions, showing one GEF coordinates parallel pathways.\",\n      \"evidence\": \"Systematic cellular GEF screen of 60 Rabs, RhoA GEF assay, and ciliogenesis knockdown phenotypes\",\n      \"pmids\": [\"35196081\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How DENND2B selects between Rab and Rho substrates is unknown\", \"Spatial regulation of the two ciliary pathways unresolved\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Demonstrated dual GEF/effector function toward Rab35 at the cytokinetic bridge, establishing a requirement for DENND2B in actin clearance and abscission.\",\n      \"evidence\": \"GEF assay, active-Rab35 pulldown, and siRNA knockdown with multinucleation, F-actin, ESCRT-III, and Aurora B readouts plus live imaging\",\n      \"pmids\": [\"37454296\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How GEF and effector roles are temporally coordinated at the bridge unclear\", \"Direct link between Rab35 activation and ESCRT-III recruitment mechanism not fully defined\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Established DENND2B as the cause of a monoallelic neurodevelopmental disorder, connecting its loss of function to human disease.\",\n      \"evidence\": \"Patient variant identification with in vivo zebrafish loss-of-function modelling of nine variants\",\n      \"pmids\": [\"40717498\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Which GTPase pathway(s) underlie the neurodevelopmental phenotype not determined\", \"Genotype-phenotype correlations across variants not resolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How DENND2B integrates its multiple GTPase substrates, isoform-specific MAPK roles, and EGFR trafficking into the neurodevelopmental disease mechanism remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural model explaining multi-substrate specificity\", \"Disease-relevant substrate(s) in neural cells not identified\", \"Relationship between DENN GEF activity and isoform-specific MAPK modulation unclear\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005085\", \"supporting_discovery_ids\": [0, 2, 3]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [3]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [3]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [4, 5, 9]},\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [2]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"RAB13\",\n      \"MICAL-L2\",\n      \"RAB35\",\n      \"RAB10\",\n      \"RHOA\",\n      \"ITSN1\",\n      \"ABL1\",\n      \"SRC\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}