{"gene":"DENND2B","run_date":"2026-04-28T17:46:02","timeline":{"discoveries":[{"year":2015,"finding":"DENND2B functions as the guanine nucleotide exchange factor (GEF) for Rab13, activating Rab13 at the leading edge of migrating cells. DENND2B also 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 limits invasive behavior of epithelial cells in vitro and growth/migration of invasive cancer cells in vivo.","method":"FRET-based Rab biosensor, Co-IP, loss-of-function knockdown, in vitro invasion assays, in vivo xenograft models","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1-2 — GEF activity directly demonstrated, FRET biosensor for spatial activation, functional rescue experiments, replicated in vitro and in vivo","pmids":["25713415"],"is_preprint":false},{"year":2017,"finding":"Intersectin-s binds DENND2B and this interaction promotes recycling of ligand-free EGFR to the cell surface. Upon EGF treatment, DENND2B is phosphorylated by protein kinase D, causing it to dissociate from intersectin-s and allowing internalized EGFR to be targeted for lysosomal degradation.","method":"Co-IP, phosphorylation assays, EGFR trafficking assays (fluorescence microscopy), knockdown experiments","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP, identification of kinase (PKD), functional trafficking readout with multiple orthogonal methods","pmids":["29030480"],"is_preprint":false},{"year":2022,"finding":"DENND2B functions as a GEF for Rab10, and through Rab10 activation, DENND2B represses primary cilia formation. Through a second, independent pathway, DENND2B acts as a GEF for RhoA (a non-Rab substrate) to control the length of primary cilia.","method":"Cell-based GEF assay screening 60 Rabs against DENN domain proteins, loss-of-function knockdown, ciliogenesis assays","journal":"Science advances","confidence":"High","confidence_rationale":"Tier 1-2 — systematic GEF screen with cellular assay, two independent pathways identified, knockdown with specific phenotypic readouts","pmids":["35196081"],"is_preprint":false},{"year":2023,"finding":"DENND2B functions as a GEF for Rab35 and recruits/activates Rab35 at the intercellular cytokinetic bridge (ICB). DENND2B's N-terminal region also interacts with active Rab35, indicating it acts as both GEF and effector for Rab35. Knockdown of DENND2B delays cytokinetic abscission, causes F-actin accumulation at the ICB, impairs ESCRT-III recruitment, triggers chromatin bridge formation, and activates the NoCut/abscission checkpoint via Aurora B kinase, leading to multinucleated cells.","method":"GEF activity assays, Co-IP/pulldown, knockdown with live-cell imaging, immunofluorescence for F-actin/ESCRT-III/Aurora B, multinucleation quantification","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 1-2 — GEF activity demonstrated, both GEF and effector roles characterized, knockdown with multiple orthogonal phenotypic readouts","pmids":["37454296"],"is_preprint":false},{"year":1998,"finding":"The human ST5/DENND2B p126 protein binds preferentially to c-Abl SH3 domain via its proline-rich PR2 sequence. Expression of p126 activates MAPK/ERK2 in response to EGF in COS-7 cells; co-expression with c-Abl greatly enhances this activity. Deletion of PR1 blocks ERK2 activation, while PR2 deletion blocks the stimulatory effect of c-Abl. The smallest isoform p70 abrogates ERK2 activation by p126.","method":"In vitro SH3 binding assays, transient transfection/overexpression, ERK2 kinase assays, deletion mutagenesis","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2-3 — in vitro binding and cellular kinase assays with deletion mutagenesis, single lab","pmids":["9632734"],"is_preprint":false},{"year":2000,"finding":"The COOH-terminal region of ST5/DENND2B p70 (residues 489-609) contains determinants required for its function as an inhibitor of the RAS-ERK2 pathway. Deletion of this region converts p70 from an inhibitor to a constitutive activator of RAS-ERK2 signaling, functioning upstream of RAS, and confers transforming activity on NIH-3T3 cells.","method":"Deletion mutagenesis, NIH-3T3 transformation/anchorage-independent growth assays, dominant-negative RAS/MEK co-expression, ERK2 kinase assays","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 — mutagenesis with functional transformation assay and epistasis using dominant-negative constructs, single lab","pmids":["10692462"],"is_preprint":false},{"year":2019,"finding":"ST5/DENND2B positively regulates osteoclastogenesis. ST5 is upregulated by RANKL and colocalizes with Src in RANKL-committed cells. ST5 knockdown reduces osteoclast differentiation, NFATc1 expression, Src and Syk activation, RANKL-evoked calcium oscillation, and NFATc1 nuclear translocation. ST5 overexpression has the opposite effect.","method":"siRNA knockdown, overexpression, immunocytochemistry co-localization, calcium imaging, kinase activation assays, osteoclast differentiation assays","journal":"Molecules and cells","confidence":"Medium","confidence_rationale":"Tier 2-3 — bidirectional loss/gain of function with multiple downstream readouts, single lab, no in vitro reconstitution","pmids":["31707778"],"is_preprint":false},{"year":2026,"finding":"Monoallelic loss-of-function variants in DENND2B cause a neurodevelopmental disorder. Patient variants affect conserved amino acids and were modeled in zebrafish, confirming loss of DENND2B function in 9 of 10 variants tested, linking DENND2B's roles in cell cycle, cell division, and ciliogenesis to neurodevelopmental disease.","method":"In silico structural modeling, in vivo zebrafish loss-of-function modeling of patient variants","journal":"Brain : a journal of neurology","confidence":"Medium","confidence_rationale":"Tier 2-3 — in vivo zebrafish validation of multiple patient variants, functional confirmation of LOF, but mechanism inferred from prior cellular studies","pmids":["40717498"],"is_preprint":false},{"year":1999,"finding":"Expression of ST5/DENND2B p70 isoform specifically in non-tumorigenic HeLa-fibroblast hybrids is linked to a flattened cell morphology and restoration of contact-regulated growth. Stable transfection of p70 into p70-negative mouse fibroblasts reduced saturation density threefold, suggesting p70 affects cytoskeletal organization and contact-inhibited growth.","method":"Stable transfection, cell morphology analysis, growth curve/saturation density assays, Western blotting","journal":"Oncogene","confidence":"Low","confidence_rationale":"Tier 3 — overexpression with phenotypic readout but no direct molecular mechanism identified beyond RAS-ERK pathway context from companion papers","pmids":["10229203"],"is_preprint":false}],"current_model":"DENND2B is a multi-substrate DENN domain GEF that activates Rab13 at the leading edge of migrating cells to promote exocytic vesicle trafficking and invasion, activates Rab10 to repress primary ciliogenesis, activates RhoA (a non-Rab GTPase) to control cilia length, and activates Rab35 at the intercellular cytokinetic bridge to recruit ESCRT-III and drive abscission; it also interacts with intersectin-s to promote EGFR recycling (an interaction disrupted by protein kinase D phosphorylation upon EGF stimulation), and its p126 isoform links c-Abl to ERK2 activation while its p70 isoform suppresses RAS-ERK2 signaling through a C-terminal regulatory domain."},"narrative":{"teleology":[{"year":1998,"claim":"Establishing that DENND2B (then called ST5) links c-Abl signaling to MAPK/ERK2 activation resolved how this gene product could relay growth-factor signals, revealing that its p126 isoform binds c-Abl via a proline-rich domain and activates ERK2, while the p70 isoform antagonizes this activity.","evidence":"In vitro SH3 binding, transient transfection/ERK2 kinase assays, and deletion mutagenesis in COS-7 cells","pmids":["9632734"],"confidence":"Medium","gaps":["No endogenous complex validation","Mechanism connecting p126 to RAS-ERK pathway intermediates not identified","Single lab, single cell type"]},{"year":1999,"claim":"Demonstrating that the p70 isoform restores contact-inhibited growth and flattened morphology in HeLa-fibroblast hybrids suggested DENND2B influences cytoskeletal organization and growth control, though without a defined molecular target.","evidence":"Stable transfection in mouse fibroblasts and HeLa-fibroblast hybrids, saturation density and morphology assays","pmids":["10229203"],"confidence":"Low","gaps":["Phenotypic readout only; no direct molecular mechanism identified","Overexpression system without loss-of-function corroboration","Relationship to GEF activity unknown"]},{"year":2000,"claim":"Mapping the C-terminal regulatory domain of p70 as required for RAS-ERK2 inhibition—and showing its deletion converts p70 into a constitutive RAS-ERK2 activator with transforming activity—established an intramolecular autoinhibitory mechanism operating upstream of RAS.","evidence":"Deletion mutagenesis, NIH-3T3 transformation assays, epistasis with dominant-negative RAS/MEK, ERK2 kinase assays","pmids":["10692462"],"confidence":"Medium","gaps":["No identification of the direct target between p70 and RAS","Single lab; no independent replication reported","Relationship to DENN-domain GEF activity unresolved"]},{"year":2015,"claim":"Identifying DENND2B as the GEF for Rab13 at the leading edge of migrating cells—and showing that this activates MICAL-L2-dependent membrane remodeling to drive invasion—established its first characterized Rab substrate and placed it in a defined vesicle-trafficking pathway controlling cell motility.","evidence":"FRET-based Rab13 biosensor, Co-IP with MICAL-L2, knockdown in vitro invasion assays, xenograft in vivo models","pmids":["25713415"],"confidence":"High","gaps":["Cargo identity of Rab13-positive vesicles at the leading edge not defined","Whether DENND2B GEF activity toward Rab13 requires post-translational regulation unknown"]},{"year":2017,"claim":"Showing that DENND2B binds intersectin-s to recycle EGFR to the plasma membrane—and that PKD-mediated phosphorylation of DENND2B upon EGF stimulation dissociates this complex to reroute EGFR toward lysosomal degradation—revealed a phosphorylation-dependent switch controlling receptor fate.","evidence":"Reciprocal Co-IP, phosphorylation assays, EGFR trafficking by fluorescence microscopy, knockdown in multiple cell types","pmids":["29030480"],"confidence":"High","gaps":["Phosphorylation sites on DENND2B not fully mapped","Whether Rab13 GEF activity is involved in EGFR recycling not tested","In vivo validation absent"]},{"year":2019,"claim":"Demonstrating that DENND2B positively regulates RANKL-driven osteoclastogenesis—via Src/Syk activation, calcium oscillation, and NFATc1 nuclear translocation—extended its functional scope to bone biology, though the direct GTPase target in this context was not identified.","evidence":"siRNA knockdown and overexpression in osteoclast precursors, calcium imaging, kinase activation assays, co-localization with Src","pmids":["31707778"],"confidence":"Medium","gaps":["Which Rab or GTPase mediates the osteoclast phenotype is unknown","Single lab without in vivo bone phenotype data","Relationship to DENN-domain GEF activity not tested"]},{"year":2022,"claim":"A systematic GEF screen revealed that DENND2B is a multi-substrate GEF: it activates Rab10 to repress primary cilia formation and independently activates the non-Rab GTPase RhoA to control cilia length, establishing dual parallel pathways governing ciliogenesis.","evidence":"Cell-based GEF screen of 60 Rabs against DENN-domain proteins, knockdown with ciliogenesis readouts","pmids":["35196081"],"confidence":"High","gaps":["Structural basis for RhoA recognition by a DENN domain unknown","Whether Rab10 and RhoA pathways converge downstream not resolved","In vivo ciliopathy phenotype not tested"]},{"year":2023,"claim":"Identifying DENND2B as the GEF for Rab35 at the cytokinetic bridge—where it also acts as a Rab35 effector—and showing that its loss impairs ESCRT-III recruitment, causes F-actin accumulation, and activates the abscission checkpoint, established DENND2B as a central regulator of cytokinetic abscission.","evidence":"GEF activity assays, Co-IP/pulldown for dual GEF-effector interaction, knockdown with live-cell imaging, immunofluorescence for ESCRT-III/Aurora B, multinucleation quantification","pmids":["37454296"],"confidence":"High","gaps":["How DENND2B is recruited to the intercellular bridge is unknown","Whether the dual GEF-effector mechanism creates a positive feedback loop not formally tested","Relative contributions of Rab35 vs. other substrates to the abscission phenotype not dissected"]},{"year":2026,"claim":"Linking monoallelic loss-of-function DENND2B variants to a neurodevelopmental disorder—with zebrafish validation confirming functional loss for 9 of 10 patient variants—connected its cellular functions in cell division and ciliogenesis to human brain development.","evidence":"Patient variant identification, in silico structural modeling, zebrafish in vivo loss-of-function modeling","pmids":["40717498"],"confidence":"Medium","gaps":["Specific GTPase substrate(s) responsible for the neurodevelopmental phenotype not identified","Mammalian in vivo model (mouse knockout) not reported","Whether haploinsufficiency affects ciliogenesis, cell division, or both in neural progenitors is unknown"]},{"year":null,"claim":"It remains unknown how DENND2B selects among its multiple GTPase substrates in different cellular contexts, whether its early-described RAS-ERK signaling functions operate through the same DENN-domain GEF mechanism, and what structural features enable recognition of the non-Rab substrate RhoA.","evidence":"","pmids":[],"confidence":"Low","gaps":["No structural model of DENND2B DENN domain bound to any substrate","Substrate selectivity mechanism across Rab13/Rab10/Rab35/RhoA unresolved","Integration of GEF-independent scaffolding functions (intersectin-s, c-Abl) with GEF activity not tested"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003924","term_label":"GTPase activity","supporting_discovery_ids":[0,2,3]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,2,3,4]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[1,4]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,1]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[3]},{"term_id":"GO:0005929","term_label":"cilium","supporting_discovery_ids":[2]}],"pathway":[{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[0,1,3]},{"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":[1,4,5]},{"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"],"other_free_text":[]},"mechanistic_narrative":"DENND2B is a multi-substrate DENN-domain guanine nucleotide exchange factor (GEF) that activates several small GTPases—Rab13, Rab10, Rab35, and RhoA—to regulate distinct vesicle trafficking and cytoskeletal processes including cell migration, ciliogenesis, EGFR recycling, and cytokinetic abscission. DENND2B activates Rab13 at the leading edge of migrating cells and interacts with the Rab13 effector MICAL-L2 to remodel the cell periphery and drive invasion [PMID:25713415]; it activates Rab35 at the intercellular cytokinetic bridge, functioning as both GEF and effector for Rab35 to recruit ESCRT-III and promote abscission [PMID:37454296]; and it activates Rab10 to repress primary ciliogenesis while independently activating RhoA to control cilia length [PMID:35196081]. DENND2B also interacts with intersectin-s to promote ligand-free EGFR recycling, an interaction disrupted by protein kinase D phosphorylation upon EGF stimulation [PMID:29030480]. Monoallelic loss-of-function variants in DENND2B cause a neurodevelopmental disorder, linking its roles in cell division and ciliogenesis to brain development [PMID:40717498]."},"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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DENND2B also 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 limits invasive behavior of epithelial cells in vitro and growth/migration of invasive cancer cells in vivo.\",\n      \"method\": \"FRET-based Rab biosensor, Co-IP, loss-of-function knockdown, in vitro invasion assays, in vivo xenograft models\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — GEF activity directly demonstrated, FRET biosensor for spatial activation, functional rescue experiments, replicated in vitro and in vivo\",\n      \"pmids\": [\"25713415\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Intersectin-s binds DENND2B and this interaction promotes recycling of ligand-free EGFR to the cell surface. Upon EGF treatment, DENND2B is phosphorylated by protein kinase D, causing it to dissociate from intersectin-s and allowing internalized EGFR to be targeted for lysosomal degradation.\",\n      \"method\": \"Co-IP, phosphorylation assays, EGFR trafficking assays (fluorescence microscopy), knockdown experiments\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP, identification of kinase (PKD), functional trafficking readout with multiple orthogonal methods\",\n      \"pmids\": [\"29030480\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"DENND2B functions as a GEF for Rab10, and through Rab10 activation, DENND2B represses primary cilia formation. Through a second, independent pathway, DENND2B acts as a GEF for RhoA (a non-Rab substrate) to control the length of primary cilia.\",\n      \"method\": \"Cell-based GEF assay screening 60 Rabs against DENN domain proteins, loss-of-function knockdown, ciliogenesis assays\",\n      \"journal\": \"Science advances\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — systematic GEF screen with cellular assay, two independent pathways identified, knockdown with specific phenotypic readouts\",\n      \"pmids\": [\"35196081\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"DENND2B functions as a GEF for Rab35 and recruits/activates Rab35 at the intercellular cytokinetic bridge (ICB). DENND2B's N-terminal region also interacts with active Rab35, indicating it acts as both GEF and effector for Rab35. Knockdown of DENND2B delays cytokinetic abscission, causes F-actin accumulation at the ICB, impairs ESCRT-III recruitment, triggers chromatin bridge formation, and activates the NoCut/abscission checkpoint via Aurora B kinase, leading to multinucleated cells.\",\n      \"method\": \"GEF activity assays, Co-IP/pulldown, knockdown with live-cell imaging, immunofluorescence for F-actin/ESCRT-III/Aurora B, multinucleation quantification\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — GEF activity demonstrated, both GEF and effector roles characterized, knockdown with multiple orthogonal phenotypic readouts\",\n      \"pmids\": [\"37454296\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"The human ST5/DENND2B p126 protein binds preferentially to c-Abl SH3 domain via its proline-rich PR2 sequence. Expression of p126 activates MAPK/ERK2 in response to EGF in COS-7 cells; co-expression with c-Abl greatly enhances this activity. Deletion of PR1 blocks ERK2 activation, while PR2 deletion blocks the stimulatory effect of c-Abl. The smallest isoform p70 abrogates ERK2 activation by p126.\",\n      \"method\": \"In vitro SH3 binding assays, transient transfection/overexpression, ERK2 kinase assays, deletion mutagenesis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — in vitro binding and cellular kinase assays with deletion mutagenesis, single lab\",\n      \"pmids\": [\"9632734\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"The COOH-terminal region of ST5/DENND2B p70 (residues 489-609) contains determinants required for its function as an inhibitor of the RAS-ERK2 pathway. Deletion of this region converts p70 from an inhibitor to a constitutive activator of RAS-ERK2 signaling, functioning upstream of RAS, and confers transforming activity on NIH-3T3 cells.\",\n      \"method\": \"Deletion mutagenesis, NIH-3T3 transformation/anchorage-independent growth assays, dominant-negative RAS/MEK co-expression, ERK2 kinase assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — mutagenesis with functional transformation assay and epistasis using dominant-negative constructs, single lab\",\n      \"pmids\": [\"10692462\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"ST5/DENND2B positively regulates osteoclastogenesis. ST5 is upregulated by RANKL and colocalizes with Src in RANKL-committed cells. ST5 knockdown reduces osteoclast differentiation, NFATc1 expression, Src and Syk activation, RANKL-evoked calcium oscillation, and NFATc1 nuclear translocation. ST5 overexpression has the opposite effect.\",\n      \"method\": \"siRNA knockdown, overexpression, immunocytochemistry co-localization, calcium imaging, kinase activation assays, osteoclast differentiation assays\",\n      \"journal\": \"Molecules and cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — bidirectional loss/gain of function with multiple downstream readouts, single lab, no in vitro reconstitution\",\n      \"pmids\": [\"31707778\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"Monoallelic loss-of-function variants in DENND2B cause a neurodevelopmental disorder. Patient variants affect conserved amino acids and were modeled in zebrafish, confirming loss of DENND2B function in 9 of 10 variants tested, linking DENND2B's roles in cell cycle, cell division, and ciliogenesis to neurodevelopmental disease.\",\n      \"method\": \"In silico structural modeling, in vivo zebrafish loss-of-function modeling of patient variants\",\n      \"journal\": \"Brain : a journal of neurology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — in vivo zebrafish validation of multiple patient variants, functional confirmation of LOF, but mechanism inferred from prior cellular studies\",\n      \"pmids\": [\"40717498\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Expression of ST5/DENND2B p70 isoform specifically in non-tumorigenic HeLa-fibroblast hybrids is linked to a flattened cell morphology and restoration of contact-regulated growth. Stable transfection of p70 into p70-negative mouse fibroblasts reduced saturation density threefold, suggesting p70 affects cytoskeletal organization and contact-inhibited growth.\",\n      \"method\": \"Stable transfection, cell morphology analysis, growth curve/saturation density assays, Western blotting\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — overexpression with phenotypic readout but no direct molecular mechanism identified beyond RAS-ERK pathway context from companion papers\",\n      \"pmids\": [\"10229203\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"DENND2B is a multi-substrate DENN domain GEF that activates Rab13 at the leading edge of migrating cells to promote exocytic vesicle trafficking and invasion, activates Rab10 to repress primary ciliogenesis, activates RhoA (a non-Rab GTPase) to control cilia length, and activates Rab35 at the intercellular cytokinetic bridge to recruit ESCRT-III and drive abscission; it also interacts with intersectin-s to promote EGFR recycling (an interaction disrupted by protein kinase D phosphorylation upon EGF stimulation), and its p126 isoform links c-Abl to ERK2 activation while its p70 isoform suppresses RAS-ERK2 signaling through a C-terminal regulatory domain.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"DENND2B is a multi-substrate DENN-domain guanine nucleotide exchange factor (GEF) that activates several small GTPases—Rab13, Rab10, Rab35, and RhoA—to regulate distinct vesicle trafficking and cytoskeletal processes including cell migration, ciliogenesis, EGFR recycling, and cytokinetic abscission. DENND2B activates Rab13 at the leading edge of migrating cells and interacts with the Rab13 effector MICAL-L2 to remodel the cell periphery and drive invasion [PMID:25713415]; it activates Rab35 at the intercellular cytokinetic bridge, functioning as both GEF and effector for Rab35 to recruit ESCRT-III and promote abscission [PMID:37454296]; and it activates Rab10 to repress primary ciliogenesis while independently activating RhoA to control cilia length [PMID:35196081]. DENND2B also interacts with intersectin-s to promote ligand-free EGFR recycling, an interaction disrupted by protein kinase D phosphorylation upon EGF stimulation [PMID:29030480]. Monoallelic loss-of-function variants in DENND2B cause a neurodevelopmental disorder, linking its roles in cell division and ciliogenesis to brain development [PMID:40717498].\",\n  \"teleology\": [\n    {\n      \"year\": 1998,\n      \"claim\": \"Establishing that DENND2B (then called ST5) links c-Abl signaling to MAPK/ERK2 activation resolved how this gene product could relay growth-factor signals, revealing that its p126 isoform binds c-Abl via a proline-rich domain and activates ERK2, while the p70 isoform antagonizes this activity.\",\n      \"evidence\": \"In vitro SH3 binding, transient transfection/ERK2 kinase assays, and deletion mutagenesis in COS-7 cells\",\n      \"pmids\": [\"9632734\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No endogenous complex validation\", \"Mechanism connecting p126 to RAS-ERK pathway intermediates not identified\", \"Single lab, single cell type\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Demonstrating that the p70 isoform restores contact-inhibited growth and flattened morphology in HeLa-fibroblast hybrids suggested DENND2B influences cytoskeletal organization and growth control, though without a defined molecular target.\",\n      \"evidence\": \"Stable transfection in mouse fibroblasts and HeLa-fibroblast hybrids, saturation density and morphology assays\",\n      \"pmids\": [\"10229203\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Phenotypic readout only; no direct molecular mechanism identified\", \"Overexpression system without loss-of-function corroboration\", \"Relationship to GEF activity unknown\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Mapping the C-terminal regulatory domain of p70 as required for RAS-ERK2 inhibition—and showing its deletion converts p70 into a constitutive RAS-ERK2 activator with transforming activity—established an intramolecular autoinhibitory mechanism operating upstream of RAS.\",\n      \"evidence\": \"Deletion mutagenesis, NIH-3T3 transformation assays, epistasis with dominant-negative RAS/MEK, ERK2 kinase assays\",\n      \"pmids\": [\"10692462\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No identification of the direct target between p70 and RAS\", \"Single lab; no independent replication reported\", \"Relationship to DENN-domain GEF activity unresolved\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Identifying DENND2B as the GEF for Rab13 at the leading edge of migrating cells—and showing that this activates MICAL-L2-dependent membrane remodeling to drive invasion—established its first characterized Rab substrate and placed it in a defined vesicle-trafficking pathway controlling cell motility.\",\n      \"evidence\": \"FRET-based Rab13 biosensor, Co-IP with MICAL-L2, knockdown in vitro invasion assays, xenograft in vivo models\",\n      \"pmids\": [\"25713415\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cargo identity of Rab13-positive vesicles at the leading edge not defined\", \"Whether DENND2B GEF activity toward Rab13 requires post-translational regulation unknown\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Showing that DENND2B binds intersectin-s to recycle EGFR to the plasma membrane—and that PKD-mediated phosphorylation of DENND2B upon EGF stimulation dissociates this complex to reroute EGFR toward lysosomal degradation—revealed a phosphorylation-dependent switch controlling receptor fate.\",\n      \"evidence\": \"Reciprocal Co-IP, phosphorylation assays, EGFR trafficking by fluorescence microscopy, knockdown in multiple cell types\",\n      \"pmids\": [\"29030480\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Phosphorylation sites on DENND2B not fully mapped\", \"Whether Rab13 GEF activity is involved in EGFR recycling not tested\", \"In vivo validation absent\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Demonstrating that DENND2B positively regulates RANKL-driven osteoclastogenesis—via Src/Syk activation, calcium oscillation, and NFATc1 nuclear translocation—extended its functional scope to bone biology, though the direct GTPase target in this context was not identified.\",\n      \"evidence\": \"siRNA knockdown and overexpression in osteoclast precursors, calcium imaging, kinase activation assays, co-localization with Src\",\n      \"pmids\": [\"31707778\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Which Rab or GTPase mediates the osteoclast phenotype is unknown\", \"Single lab without in vivo bone phenotype data\", \"Relationship to DENN-domain GEF activity not tested\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"A systematic GEF screen revealed that DENND2B is a multi-substrate GEF: it activates Rab10 to repress primary cilia formation and independently activates the non-Rab GTPase RhoA to control cilia length, establishing dual parallel pathways governing ciliogenesis.\",\n      \"evidence\": \"Cell-based GEF screen of 60 Rabs against DENN-domain proteins, knockdown with ciliogenesis readouts\",\n      \"pmids\": [\"35196081\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis for RhoA recognition by a DENN domain unknown\", \"Whether Rab10 and RhoA pathways converge downstream not resolved\", \"In vivo ciliopathy phenotype not tested\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Identifying DENND2B as the GEF for Rab35 at the cytokinetic bridge—where it also acts as a Rab35 effector—and showing that its loss impairs ESCRT-III recruitment, causes F-actin accumulation, and activates the abscission checkpoint, established DENND2B as a central regulator of cytokinetic abscission.\",\n      \"evidence\": \"GEF activity assays, Co-IP/pulldown for dual GEF-effector interaction, knockdown with live-cell imaging, immunofluorescence for ESCRT-III/Aurora B, multinucleation quantification\",\n      \"pmids\": [\"37454296\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How DENND2B is recruited to the intercellular bridge is unknown\", \"Whether the dual GEF-effector mechanism creates a positive feedback loop not formally tested\", \"Relative contributions of Rab35 vs. other substrates to the abscission phenotype not dissected\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Linking monoallelic loss-of-function DENND2B variants to a neurodevelopmental disorder—with zebrafish validation confirming functional loss for 9 of 10 patient variants—connected its cellular functions in cell division and ciliogenesis to human brain development.\",\n      \"evidence\": \"Patient variant identification, in silico structural modeling, zebrafish in vivo loss-of-function modeling\",\n      \"pmids\": [\"40717498\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Specific GTPase substrate(s) responsible for the neurodevelopmental phenotype not identified\", \"Mammalian in vivo model (mouse knockout) not reported\", \"Whether haploinsufficiency affects ciliogenesis, cell division, or both in neural progenitors is unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unknown how DENND2B selects among its multiple GTPase substrates in different cellular contexts, whether its early-described RAS-ERK signaling functions operate through the same DENN-domain GEF mechanism, and what structural features enable recognition of the non-Rab substrate RhoA.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No structural model of DENND2B DENN domain bound to any substrate\", \"Substrate selectivity mechanism across Rab13/Rab10/Rab35/RhoA unresolved\", \"Integration of GEF-independent scaffolding functions (intersectin-s, c-Abl) with GEF activity not tested\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003924\", \"supporting_discovery_ids\": [0, 2, 3]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 2, 3, 4]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [1, 4]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [3]},\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [2]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [0, 1, 3]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [3]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [1, 4, 5]},\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    ],\n    \"other_free_text\": []\n  }\n}\n```"}