{"gene":"RAB35","run_date":"2026-04-28T19:45:45","timeline":{"discoveries":[{"year":2006,"finding":"Rab35 localizes to the plasma membrane and endocytic compartments and controls a fast endocytic recycling pathway; inhibition of Rab35 leads to failed cytokinesis with accumulation of endocytic markers on cytoplasmic vacuoles, and Rab35 is required for intercellular bridge localization of PIP2 and septin SEPT2 during cytokinesis.","method":"Dominant-negative/GTP-locked mutant overexpression, fluorescence microscopy, endocytic marker trafficking assays in human cells","journal":"Current biology : CB","confidence":"High","confidence_rationale":"Tier 2 — clean loss-of-function with defined cellular phenotype, replicated across multiple subsequent studies","pmids":["16950109"],"is_preprint":false},{"year":2008,"finding":"In C. elegans, RME-4 (a DENN domain protein) binds RAB-35 in its GDP-loaded conformation and is enriched on clathrin-coated pits; RME-4 recruits RAB-35 to coated pits/vesicles, and RAB-35 in turn promotes receptor recycling from early endosomes. Genetic epistasis shows RME-4 and RAB-35 function downstream of clathrin and upstream of RAB-7, acting synergistically with RAB-11 and RME-1.","method":"C. elegans genetic screens, yeast two-hybrid, GFP localization, epistasis analysis","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 — genetic epistasis with multiple orthogonal methods, C. elegans ortholog","pmids":["18354496"],"is_preprint":false},{"year":2008,"finding":"Rab35 is recruited to the immunological synapse (IS) in T cells; EPI64C (TBC1D10C) functions as a Rab35-GAP both in vitro and in transfection assays. Dominant-negative Rab35 or EPI64C impair transferrin recycling in T cells and TCR enrichment at the IS, and conjugate formation is impaired by both Rab35-DN and EPI64C.","method":"In vitro GAP assay, transfection of DN constructs, co-localization microscopy, siRNA knockdown in Jurkat T cells","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 — in vitro GAP activity demonstrated plus cellular loss-of-function with defined phenotype","pmids":["18450757"],"is_preprint":false},{"year":2009,"finding":"Rab35 directly associates with the actin-bundling protein fascin as an effector; active Rab35 recruits fascin to actin filaments and targeting Rab35 to the outer mitochondrial membrane triggers ectopic actin recruitment. Rab35 regulates actin filament assembly during Drosophila bristle development and filopodia formation in cultured cells.","method":"Direct binding assay (pulldown), ectopic mitochondrial targeting, Drosophila genetics, cell culture filopodia assay","journal":"Science (New York, N.Y.)","confidence":"High","confidence_rationale":"Tier 1 — direct binding demonstrated, ectopic reconstitution confirms sufficiency, replicated in two model systems","pmids":["19729655"],"is_preprint":false},{"year":2009,"finding":"Rab35 colocalizes with Cdc42 and can activate Cdc42 both in vivo and in vitro; activated Rab35 stimulates neurite outgrowth in PC12 and N1E-115 cells via a Cdc42-dependent pathway, and siRNA knockdown of Rab35 abolishes neurite outgrowth.","method":"In vitro Cdc42 activation assay, siRNA knockdown, neurite outgrowth quantification, co-localization microscopy","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2 — in vitro assay plus KD phenotype, single lab","pmids":["19289122"],"is_preprint":false},{"year":2010,"finding":"The DENN domain of connecdenn/DENND1A functions as a guanine nucleotide exchange factor (GEF) for Rab35; loss of Rab35 activity causes enlargement of early endosomes, inhibits MHC class I recycling, and prevents early endosomal recruitment of EHD1.","method":"In vitro GEF assay, siRNA knockdown, endosome morphology analysis, cargo recycling assay","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 — enzymatic GEF activity demonstrated in vitro with defined cellular phenotypes upon loss-of-function","pmids":["20159556"],"is_preprint":false},{"year":2010,"finding":"Connecdenn 2 (DENND1B) also functions as a Rab35 GEF through its DENN domain; all three connecdenns (DENND1A-C) function as Rab35 GEFs with different activity levels. The DENN domains of connecdenn 1 and 2 bind Rab35, whereas connecdenn 3 does not, showing that Rab35 binding and activation are separable functions. All three connecdenns bind clathrin and AP-2 through their C-termini.","method":"In vitro GEF assay, yeast two-hybrid, siRNA knockdown, endosome morphology","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — in vitro enzymatic activity demonstrated for three family members, binding separability shown","pmids":["20154091"],"is_preprint":false},{"year":2010,"finding":"Rab35 mediates vesicle transport required for phagocytosis in Drosophila; Rab35-dependent recruitment of Cdc42 and Rac1 to sites of filopodium and lamellipodium formation occurs via microtubule tracks.","method":"Drosophila genetics, live-cell imaging, immunofluorescence in Drosophila S2 cells","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 — genetic loss-of-function with defined trafficking phenotype in Drosophila ortholog","pmids":["20065041"],"is_preprint":false},{"year":2011,"finding":"GTP-bound (active) Rab35 directly interacts with OCRL (a PtdIns(4,5)P2 5-phosphatase mutated in Lowe syndrome) and controls its localization at the intercellular bridge during cytokinesis; Rab35 or OCRL depletion inhibits cytokinesis abscission with local PtdIns(4,5)P2 and F-actin accumulation, and OCRL acts as an effector of Rab35 to remodel F-actin for abscission.","method":"Direct binding assay (GST pulldown), siRNA depletion, PtdIns(4,5)P2 imaging, F-actin quantification, cytokinesis assays in human cells and Lowe patient cell lines","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 1 — direct interaction demonstrated, multiple orthogonal methods, disease-relevant validation","pmids":["21706022"],"is_preprint":false},{"year":2011,"finding":"MICAL-L1 is a Rab35-binding partner on tubular recycling endosomes; active Rab35 impairs MICAL-L1 recruitment to tubular recycling endosomes while Rab35 depletion promotes enhanced MICAL-L1 localization, indicating Rab35 is an upstream regulator of MICAL-L1. Arf6 also forms a complex with MICAL-L1 for recruitment to tubular endosomes.","method":"Co-immunoprecipitation, overexpression and depletion studies, fluorescence microscopy","journal":"Traffic (Copenhagen, Denmark)","confidence":"Medium","confidence_rationale":"Tier 3 — co-IP and cellular imaging, single lab","pmids":["21951725"],"is_preprint":false},{"year":2011,"finding":"Rab35 is required for the early stage of FcγR-mediated phagocytosis in macrophages; active Rab35 recruits ACAP2 (an ARF6 GAP) to the phagocytic cup, and this GTP-Rab35/ACAP2 interaction is required for actin-dependent pseudopod extension and phagosome formation.","method":"siRNA knockdown, live-cell imaging, expression of GTP/GDP-locked mutants, pulldown assay, co-localization microscopy in macrophages","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods, direct binding shown, defined phagocytic phenotype","pmids":["22045739"],"is_preprint":false},{"year":2011,"finding":"Connecdenn 3 (DENND1C) directly binds actin via a unique C-terminal motif not found in connecdenn 1 or 2, coupling Rab35 activation to the actin cytoskeleton; connecdenn 3 co-localizes with fascin and actin filaments, identifying it as the relevant GEF for Rab35-mediated actin regulation and membrane protrusion formation.","method":"Direct actin-binding assay, GEF assay, co-localization microscopy, cell morphology analysis","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 1-2 — direct binding demonstrated, GEF activity confirmed, functional consequences shown","pmids":["22072793"],"is_preprint":false},{"year":2011,"finding":"A genome-wide RUN domain screen identified RUSC2 as a GTP-Rab35-specific binding protein; the minimal Rab35-binding site of RUSC2 (residues 982-1199) was defined and used to develop RBD35, a GTP-Rab35 trapper that specifically pulls down active Rab35 and inhibits neurite outgrowth when overexpressed.","method":"Yeast two-hybrid genome-wide screen, in vitro pull-down, PC12 cell overexpression assay","journal":"Cell structure and function","confidence":"Medium","confidence_rationale":"Tier 2 — genome-wide screen with biochemical validation and functional tool development","pmids":["21737958"],"is_preprint":false},{"year":2012,"finding":"ARF6 negatively regulates Rab35 activation via the Rab35 GAP EPI64B, which acts as an ARF6 effector; constitutively active ARF6 causes identical endocytic recycling and cytokinesis defects as GDP-Rab35. This ARF6/Rab35 GTPase cascade operates at clathrin-coated pits where activated ARF6 reduces Rab35 loading into the endocytic pathway.","method":"Constitutively active/inactive mutant expression, GAP activity assays, cytokinesis assays, endocytic recycling assays in human cells","journal":"Current biology : CB","confidence":"High","confidence_rationale":"Tier 2 — cascade dissected with multiple mutants and orthogonal assays, mechanistic pathway placement","pmids":["22226746"],"is_preprint":false},{"year":2012,"finding":"Rab35 functions as a Rab35 effector and Arf6-GAP coupling mechanism through centaurin-β2 (ACAP2): Rab35 accumulates at Arf6-positive endosomes upon NGF stimulation and recruits centaurin-β2 in a Rab35-dependent manner; the Arf6-GAP activity of centaurin-β2 at these endosomes is indispensable for NGF-induced neurite outgrowth in PC12 cells.","method":"siRNA knockdown, rescue experiments, live-cell imaging, co-localization assays in PC12 cells","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 — genetic epistasis with knockdown and rescue, defined pathway placement","pmids":["22344257"],"is_preprint":false},{"year":2012,"finding":"Rab35 suppresses Arf6 activity to downregulate Arf6-dependent recycling of β1-integrin and EGF receptors, while simultaneously maintaining cadherins at the cell surface; Rab35 knockdown promotes cell migration consistent with epithelial-mesenchymal transition by inverting this balance.","method":"siRNA knockdown, cell adhesion and migration assays, cargo recycling assays, co-immunoprecipitation","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods showing coordinated regulation of two trafficking pathways","pmids":["23264734"],"is_preprint":false},{"year":2012,"finding":"Rab35 regulates cadherin trafficking and stabilization at cell-cell contacts in myoblasts and HeLa cells; Rab35 is required for N- and M-cadherin recruitment to cell contacts, their association with p120 catenin, and for PIP5KIγ accumulation at contacts for PIP2 production. Rab35 knockdown impairs myoblast fusion.","method":"siRNA knockdown, dominant-negative expression, fluorescence microscopy, co-immunoprecipitation, myoblast fusion assay","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods, defined phenotypic readouts","pmids":["23197472"],"is_preprint":false},{"year":2012,"finding":"In Drosophila tracheal terminal cells, Rab35 and its apical membrane-localized GAP Whacked polarize seamless tube growth along the proximodistal axis; loss of Whacked (or constitutive Rab35 activation) leads to tube overgrowth at branch tips, while overexpression of Whacked or dominant-negative Rab35 causes ectopic tubes near the nucleus.","method":"Drosophila genetics (loss-of-function mutants), live imaging, epistasis analysis","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 2 — Drosophila ortholog, genetic epistasis with defined morphological phenotype","pmids":["22407366"],"is_preprint":false},{"year":2012,"finding":"TBC1D13 functions as a Rab35-specific GAP in vitro; overexpression of constitutively active Rab35 (but not Rab10) reverses the TBC1D13-dependent block in insulin-stimulated GLUT4 translocation in adipocytes, implicating Rab35 in the insulin-stimulated GLUT4 trafficking pathway.","method":"In vitro GAP activity screen, yeast two-hybrid, constitutively active mutant rescue, GLUT4 translocation assay in adipocytes","journal":"Traffic (Copenhagen, Denmark)","confidence":"High","confidence_rationale":"Tier 1-2 — in vitro GAP activity demonstrated, cellular rescue experiment with specific mutant","pmids":["22762500"],"is_preprint":false},{"year":2014,"finding":"Rab35 promotes neurite outgrowth via MICAL-L1 as a scaffold: Rab35 determines the intracellular localization of MICAL-L1, which in turn recruits Rab8, Rab13, and Rab36 to Arf6-positive recycling endosomes. Each downstream Rab regulates neurite outgrowth non-redundantly downstream of Rab35 and MICAL-L1.","method":"Functional ablation (siRNA), rescue experiments, co-localization microscopy, neurite outgrowth quantification in PC12 cells","journal":"Biology open","confidence":"High","confidence_rationale":"Tier 2 — epistatic pathway dissected with knockdown and rescue, multiple downstream Rabs characterized","pmids":["25086062"],"is_preprint":false},{"year":2014,"finding":"Rab35 and its effector ACAP2 negatively regulate oligodendrocyte differentiation and myelination by inactivating Arf6; as differentiation initiates, Rab35 and ACAP2 activities decrease while Arf6 activity increases. Arf6 knockdown inhibits differentiation, placing Rab35/ACAP2 upstream of Arf6 in a GTPase switching mechanism.","method":"siRNA knockdown, GTPase activity assays, morphological differentiation scoring, myelination co-culture","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 — epistasis established with multiple knockdowns and activity measurements","pmids":["24600047"],"is_preprint":false},{"year":2015,"finding":"Rab35 is activated on newborn endosomes immediately after CCV scission via precise spatial-temporal loading: DENND1A is recruited first, then EPI64B disappears, allowing Rab35 activation; active Rab35 then directly recruits the OCRL phosphatase for post-scission PtdIns(4,5)P2 hydrolysis. Depletion of Rab35 or OCRL leads to retention of CI-MPR in peripheral clathrin-positive PtdIns(4,5)P2-rich endosomes.","method":"Live TIRF microscopy, siRNA depletion, cargo trafficking assays, direct binding assay, PtdIns(4,5)P2 imaging","journal":"Current biology : CB","confidence":"High","confidence_rationale":"Tier 1-2 — direct interaction demonstrated, TIRF imaging provides high spatial-temporal resolution, multiple orthogonal approaches","pmids":["26725203"],"is_preprint":false},{"year":2015,"finding":"Rab35 controls endosomal sorting of clathrin-independent endocytosis (CIE) cargo; Rab35 delivered via clathrin-mediated endocytosis inactivates Arf6 through ACAPs (Arf6 GAPs), maintaining tubular endosomal networks and preventing lysosomal degradation of CIE cargos (CD44, CD98, CD147). siRNA knockdown of Rab35 recreates the altered trafficking phenotype of CME inhibition.","method":"siRNA knockdown, CME inhibition, cargo trafficking assays, Arf6-GTP measurement, rescue by Rab35 or ACAPs expression","journal":"Traffic (Copenhagen, Denmark)","confidence":"High","confidence_rationale":"Tier 2 — mechanistic rescue experiments establish pathway, multiple orthogonal methods","pmids":["25988331"],"is_preprint":false},{"year":2015,"finding":"Two threonine residues (Thr-76 and Thr-81) in the switch II region of Rab35 are specifically required for binding ACAP2 (centaurin-β2) but dispensable for other Rab35 interactions; two asparagine residues (Asn-610 and Asn-691) in ACAP2 are key for Rab35 recognition. Binding-deficient mutants of either protein fail to support neurite outgrowth in PC12 cells.","method":"Deletion/point mutagenesis, pulldown assays, knockdown-rescue in PC12 cells","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — structure-function mutagenesis with functional rescue, defines binding interface","pmids":["25694427"],"is_preprint":false},{"year":2016,"finding":"Rab35 directly couples cytokinesis with initiation of apico-basal polarity in 3D MDCK cyst cultures by tethering intracellular vesicles containing apical determinants (aPKC, Cdc42, Crumbs3, Podocalyxin) at the cleavage site through a direct interaction between Rab35 and the cytoplasmic tail of Podocalyxin. Rab35 inactivation leads to complete polarity inversion in 3D cysts.","method":"3D MDCK cyst cultures, dominant-negative expression, direct binding (pulldown), co-localization microscopy, polarity marker imaging","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1-2 — direct binding demonstrated, defined molecular mechanism with functional consequence","pmids":["27040773"],"is_preprint":false},{"year":2016,"finding":"Neuronal activity drives Rab35 activation and binding to the ESCRT-0 protein Hrs, identified as a novel Rab35 effector; Rab35 activation and Hrs binding recruit downstream ESCRT machinery to synaptic vesicle pools to initiate activity-dependent SV protein degradation.","method":"Co-immunoprecipitation, siRNA knockdown, live-cell imaging, neuronal activity stimulation in rat hippocampal neurons","journal":"The Journal of neuroscience : the official journal of the Society for Neuroscience","confidence":"High","confidence_rationale":"Tier 2 — novel effector identified by Co-IP, defined pathway with activity-dependent readout","pmids":["27535913"],"is_preprint":false},{"year":2016,"finding":"Rab35 promotes axon elongation in primary neurons; PRPK (p53-related protein kinase) negatively regulates axonal elongation by targeting Rab35 for ubiquitin-proteasome degradation, and MAP1B interacts with PRPK to prevent this degradation. Rab35 also regulates Cdc42 activity in neurons.","method":"siRNA knockdown, ubiquitin-proteasome pathway assays, MAP1B KO neurons, rescue by Rab35 overexpression or PRPK inactivation, epistasis analysis","journal":"The Journal of neuroscience : the official journal of the Society for Neuroscience","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods, defined epistatic relationships, first evidence for Rab proteasomal regulation","pmids":["27383602"],"is_preprint":false},{"year":2016,"finding":"Rab35 in Drosophila epithelium is dynamically planar-polarized, enriched at contractile interfaces of intercalating cells; disruption of Rab35 function allows oscillations but prevents ratchet-like stabilization of contractions, so interfaces fail to shorten. Rab35 compartment initiation does not require Myosin II but compartments fail to terminate without actomyosin.","method":"Drosophila genetics, live imaging, dominant-negative expression, Myosin II perturbation","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — Drosophila ortholog, genetic perturbations with quantitative live imaging","pmids":["28883443"],"is_preprint":false},{"year":2017,"finding":"GTP-bound Rab35 directly binds and recruits the autophagy receptor NDP52 to bacteria-containing endosomes and promotes NDP52 interaction with ubiquitin; TBC1D10A (GAP) inhibits this process while TBK1 (associated with NDP52) stimulates it. Rab35 also promotes NDP52 recruitment to damaged mitochondria and autophagosomes for mitophagy and autophagosome maturation.","method":"Direct binding assay, Co-IP, siRNA knockdown, bacterial infection model, mitophagy assay","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1-2 — direct binding demonstrated, multiple autophagy contexts tested with orthogonal methods","pmids":["28848034"],"is_preprint":false},{"year":2017,"finding":"Rab35 is required for evoked Weibel-Palade body (WPB) exocytosis in endothelial cells; TBC1D10A is its GAP in this context. Rab35 acts through ACAP2 as an effector, and ACAP2 negatively regulates WPB exocytosis, while Arf6 (downstream of ACAP2) supports exocytosis.","method":"Genome-wide RabGAP screen, RabGAP overexpression, pulldown, co-IP, siRNA knockdown, WPB exocytosis assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — genome-wide screen, direct binding confirmed, pathway cascade defined with multiple perturbations","pmids":["28566286"],"is_preprint":false},{"year":2018,"finding":"LRRK2 kinase phosphorylates RAB35 to modulate α-synuclein propagation; the PD-linked G2019S mutation in LRRK2, which increases kinase activity, enhances α-synuclein propagation efficiency. Constitutive activation of RAB35 overrides reduced α-synuclein propagation in lrk-1 mutant C. elegans, placing RAB35 downstream of LRRK2 in this pathway.","method":"Cell culture, C. elegans genetics, rodent model, LRRK2 kinase inhibitor treatment, phosphorylation assays, epistasis","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — phosphorylation demonstrated, epistasis in multiple model organisms, kinase inhibitor rescue","pmids":["30150626"],"is_preprint":false},{"year":2018,"finding":"RAB35 is required for apoptotic cell recognition and phagosome maturation in C. elegans as a third, parallel pathway to CED-1 and CED-5; RAB-35 promotes the phagosomal PI(4,5)P2-to-PI(3)P shift and recruits RAB-5 to phagosomal surfaces. GEFs FLCN-1 and RME-4, and GAP TBC-10, regulate RAB-35 in this context.","method":"C. elegans genetic screen, epistasis analysis, phosphoinositide imaging, phagosome maturation assays","journal":"PLoS genetics","confidence":"High","confidence_rationale":"Tier 2 — C. elegans ortholog, genetic epistasis with defined molecular pathway, multiple orthogonal assays","pmids":["30138370"],"is_preprint":false},{"year":2018,"finding":"In C. elegans linker cell-type death (LCD), RAB-35 GTPase coordinates competitive phagocytosis onset and cell degradation; RAB-35 binds CNT-1, an ARF-6 GAP, and removes ARF-6 from phagosome membranes, facilitating PI(4,5)P2 removal and promoting phagolysosome maturation.","method":"Microfluidics-based long-term in vivo imaging, C. elegans genetics, phosphoinositide imaging, epistasis analysis","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 2 — C. elegans ortholog, direct binding shown, defined molecular pathway with in vivo imaging","pmids":["30220571"],"is_preprint":false},{"year":2018,"finding":"RAB35 directly regulates p85/PI3K activity to control oscillatory circular dorsal ruffles (CDRs) required for chemotactic migration; RAB35 is necessary and sufficient for growth factor-induced CDR waves and essential for chemotactic migration and chemoinvasion.","method":"RNAi screen, live-cell imaging, PI3K activity assay, chemotaxis assay, CDR quantification","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — RNAi-based screen with mechanistic follow-up, direct PI3K regulatory role established","pmids":["29662076"],"is_preprint":false},{"year":2019,"finding":"Rab35 controls cilium length, function, and membrane composition; Rab35 localizes to cilia along with its GEF (DENND1B) and GAP (TBC1D10A) regulators. Rab35 promotes ciliary targeting of Smoothened, limits ciliary accumulation of Arl13b and INPP5E, regulates ciliary PI(4,5)P2 levels, and interacts with Arl13b. Loss of Rab35 causes left-right asymmetry defects in zebrafish.","method":"siRNA knockdown, morpholinos (zebrafish), knockout, GFP localization, ciliary membrane composition analysis","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 2 — multiple model systems, direct localization, GEF/GAP regulators also localize to cilia, defined phenotypes","pmids":["31432619"],"is_preprint":false},{"year":2019,"finding":"IL-17A induces recruitment of Rab35 and DENND1C (GEF) to the IL-17R/Act1 complex in airway smooth muscle cells, activating Rab35; Rab35 activation is required for PKCα activation and fascin phosphorylation at Ser39, allowing F-actin/myosin stress fiber formation and enhanced smooth muscle contraction.","method":"Co-IP, siRNA knockdown, PKCα inhibitor treatment, actin stress fiber imaging, muscle contraction assay","journal":"Journal of immunology (Baltimore, Md. : 1950)","confidence":"High","confidence_rationale":"Tier 2 — receptor-level recruitment shown, signaling cascade dissected with multiple perturbations","pmids":["30683702"],"is_preprint":false},{"year":2020,"finding":"Rab35 controls myelin growth by forming a complex with myotubularin-related PI 3-phosphatases MTMR13 and MTMR2; Rab35-dependent lipid turnover by myotubularins downregulates PI 3-phosphate levels and mTORC1 activity. Targeted disruption of Rab35 causes elevated PI 3-phosphates, hyperactivation of mTORC1, and focal hypermyelination in vivo, rescued by pharmacological inhibition of PI(3,5)P2 synthesis or mTORC1.","method":"Co-IP (complex formation), in vivo Rab35 knockout, PI phospholipid measurement, mTORC1 activity assay, pharmacological rescue","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1-2 — direct complex formation, in vivo KO with defined molecular pathway, pharmacological rescue","pmids":["32503983"],"is_preprint":false},{"year":2020,"finding":"The C-terminal polybasic cluster (approximately 30 amino acids) of Rab35 is critical for its plasma membrane localization; reducing the number of basic amino acids in this region shifts Rab35 localization from the plasma membrane to the Golgi membrane.","method":"Rab35-Rab10 chimera constructs, confocal microscopy of EGFP-fused chimeras","journal":"Acta histochemica et cytochemica","confidence":"Medium","confidence_rationale":"Tier 2 — domain swap experiment defines localization determinant with direct microscopy","pmids":["32873993"],"is_preprint":false},{"year":2020,"finding":"Rab35 promotes tunneling nanotube (TNT) formation and TNT-mediated vesicle transfer in neuronal cells; Rab35-GTP, ACAP2, ARF6-GDP, and EHD1 act in a cascade to promote TNT formation, while MICAL-L1 (required for neurite outgrowth) is not required for TNTs, indicating distinct pathway branching.","method":"Overexpression of GTP/GDP-locked mutants, dominant-negative expression, TNT quantification, vesicle transfer assay","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 — cascade dissected with defined mutants, novel cellular function identified","pmids":["33033331"],"is_preprint":false},{"year":2021,"finding":"BAG3 interacts with TBC1D10B (EPI64B, the Rab35 GAP) via a BAG3-HSP70-TBC1D10B complex that attenuates TBC1D10B's ability to inactivate RAB35; this supports RAB35 activation and HRS recruitment to initiate ESCRT-mediated endosomal tau clearance. BAG3-TBC1D10B colocalization is reduced in AD brains.","method":"Mass spectrometry (BAG3 interactome), Co-IP, live-cell imaging, BAG3 overexpression in P301S tau transgenic mice, IHC in human AD brains","journal":"Biological psychiatry","confidence":"High","confidence_rationale":"Tier 2 — MS interactome plus multiple biochemical assays, in vivo validation","pmids":["35000752"],"is_preprint":false},{"year":2021,"finding":"Rab35 negatively regulates Aβ production by sorting APP and BACE1 out of the endosomal network; Rab35 coordinates distinct trafficking steps for BACE1 and APP mediated by its effectors OCRL and ACAP2, respectively. Rab35 overexpression prevents amyloidogenic trafficking of APP and BACE1 induced by high glucocorticoid levels.","method":"Overexpression and knockdown, APP/BACE1 localization assays, Aβ production measurement, dominant-negative effector expression","journal":"Cell death & disease","confidence":"High","confidence_rationale":"Tier 2 — distinct effector pathways for two substrates defined, functional consequence (Aβ production) measured","pmids":["34876559"],"is_preprint":false},{"year":2021,"finding":"Rab35 regulates insulin secretion in pancreatic β cells and interacts with phogrin (a marker of insulin granule exocytosis); Rab35 overexpression promotes insulin secretion and decreases phogrin expression, while Rab35 silencing inhibits insulin secretion and causes phogrin redistribution. The Rab35/phogrin interaction was confirmed by GST pulldown, co-IP, and co-localization.","method":"GST pulldown, co-IP, co-localization microscopy, insulin secretion assay in β-TC-6 cells","journal":"Clinical and experimental pharmacology & physiology","confidence":"Medium","confidence_rationale":"Tier 2 — direct interaction demonstrated, functional phenotype defined, single lab","pmids":["34448213"],"is_preprint":false},{"year":2023,"finding":"PI(4,5)P2 recruits Rab35 to migrasome formation sites by interacting with the C-terminal polybasic cluster of Rab35; active Rab35 then promotes migrasome formation by recruiting and concentrating integrin α5 at these sites, likely via direct Rab35-integrin α5 interaction.","method":"Live imaging, PI(4,5)P2 manipulation, Rab35 mutant expression, integrin α5 co-localization and pulldown","journal":"Cell research","confidence":"High","confidence_rationale":"Tier 2 — direct molecular interaction, defined upstream signal (PI(4,5)P2) and downstream effector (integrin α5)","pmids":["37142675"],"is_preprint":false},{"year":2023,"finding":"DENND2B functions as a Rab35 GEF that recruits and activates Rab35 at the intercellular bridge (ICB) during cytokinesis; DENND2B's N-terminal region also interacts with active Rab35, making it both a GEF and effector. Knockdown of DENND2B delays abscission, causes multinucleation, F-actin accumulation at the ICB, impairs ESCRT-III recruitment, forms chromatin bridges, and activates the Aurora B NoCut/abscission checkpoint.","method":"GEF activity assay, Co-IP, siRNA knockdown, cytokinesis assays, ESCRT-III imaging, Aurora B activation measurement","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 1-2 — GEF activity demonstrated, dual GEF/effector function established, defined abscission checkpoint pathway","pmids":["37454296"],"is_preprint":false},{"year":2023,"finding":"The Chlamydia trachomatis effector CpoS interacts with Rab35 to suppress STING-dependent type I interferon responses; depletion of Rab35 phenocopies exacerbated interferon responses seen during CpoS-deficient infection, and CpoS mediates transport of sphingolipids to the inclusion via Rab GTPase interaction.","method":"Genetic complementation with CpoS variants, Rab35 siRNA knockdown, interferon response measurement, lipid transport assay","journal":"mBio","confidence":"Medium","confidence_rationale":"Tier 2 — Rab35 depletion phenocopies bacterial mutant, mechanistic link between trafficking and innate immunity","pmids":["37530528"],"is_preprint":false},{"year":2023,"finding":"DENND1A and folliculin (FLCN) function as distinct Rab35 GEFs in different cellular contexts: in 3D MDCK cysts, only DENND1A knockout phenocopies Rab35 KO for podocalyxin (PODXL) mis-sorting, while FLCN knockdown phenocopies Rab35 KD in 2D cultures. The FLCN-Rab35-OCRL and DENND1A-Rab35-ACAP2 axes define two distinct functional cascades.","method":"siRNA knockdown, CRISPR knockout, PODXL trafficking assays in 2D and 3D MDCK cultures","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — systematic GEF comparison with CRISPR KO and rescue, two distinct cascades defined","pmids":["31992598"],"is_preprint":false},{"year":2023,"finding":"USP32, a deubiquitylase, binds Rab35 and protects it from proteasomal degradation by reducing K48-ubiquitination; ETV1 transcription factor promotes USP32 expression in GISTs, and loss of Rab35 decreases exosome secretion and transmission of imatinib resistance.","method":"Co-IP, iTRAQ proteomics, ubiquitin assays, knockdown/overexpression, exosome quantification","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 2 — direct interaction and ubiquitination site defined, deubiquitylase mechanism established","pmids":["36725886"],"is_preprint":false},{"year":2024,"finding":"A homozygous missense variant R27H in the GTPase fold of RAB35 causes a neurodevelopmental disorder; functional analysis shows R27H-Rab35 has enhanced interaction with its GEF DENND1A and decreased interaction with effector MICAL1, indicating an inactive conformation. R27H expression activates Arf6 (under negative Rab35 control), delays cytokinesis, and alters primary cilia length, number, and Arl13b composition.","method":"Exome sequencing, in vitro binding assays (GEF and effector interactions), Arf6 activation assay, cytokinesis assay, primary cilia analysis in patient variant","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 — variant protein characterized biochemically with multiple assays, pathogenic mechanism defined","pmids":["38432637"],"is_preprint":false},{"year":2024,"finding":"The Shigella effector IcsB post-translationally acylates Rab35 in its polybasic region (lysine Nε-fatty acylation), non-canonically entrapping Rab35 at the bacterial-containing vacuole (BCV); Rab35 and IcsB are required not for initial BCV breakage but for unwrapping damaged BCV remnants from Shigella after vacuolar rupture.","method":"STED super-resolution microscopy, bacterial genetics (IcsB mutants), post-translational modification analysis, infection assays","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 1-2 — novel PTM (bacterial acylation) demonstrated, STED imaging at nanoscale resolution, genetic dissection","pmids":["38568808"],"is_preprint":false},{"year":2024,"finding":"Congenital Rab35 knockout in mice causes embryonic lethality at E7.5; brain-specific Rab35 knockout causes severe defects in hippocampal lamination due to impaired pyramidal neuron distribution, and these mice show spatial memory and anxiety-related behavioral defects. Loss of RAB35 affects other RAB proteins associated with endocytic trafficking and cell adhesion molecules including contactin-2.","method":"Rab35 knockout mice (congenital and brain-specific), quantitative proteomics, behavioral testing, histology","journal":"Communications biology","confidence":"High","confidence_rationale":"Tier 2 — in vivo KO with defined phenotype, quantitative proteomics for molecular consequences","pmids":["37085665"],"is_preprint":false},{"year":2024,"finding":"Retromer directly associates with the RAB35 regulator TBC1D13 at the endosomal retrieval sub-domain, revealed by proximity proteomics and X-ray crystallography combined with biochemical validation, indicating Retromer is a hub for RAB35 GTPase cycle regulation at endosomes.","method":"Comparative proximity proteomics, X-ray crystallography, in silico predictions, biochemical validation","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 1 preprint — structural and biochemical evidence, but not yet peer-reviewed","pmids":["bio_10.1101_2024.11.22.622898"],"is_preprint":true},{"year":2024,"finding":"MICAL1, activated by Rab35 at HIV-1 budding sites, locally depolymerizes branched actin networks to promote HIV-1 budding and release; Rab35 is recruited at budding sites and functions in the same pathway as MICAL1, and both are required for viral release. MICAL1 controls timely ESCRT scission machinery recruitment during budding.","method":"Super-resolution microscopy, siRNA knockdown, Arp2/3 inhibition rescue, ESCRT recruitment imaging","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 preprint — multiple orthogonal methods, pathway placement, not yet peer-reviewed","pmids":["bio_10.1101_2024.10.07.616958"],"is_preprint":true}],"current_model":"RAB35 is a plasma membrane- and endosome-localized small GTPase that is activated by DENN-domain GEFs (DENND1A/B/C, DENND2B, FLCN) and inactivated by GAPs (EPI64B/TBC1D10A/B/C, TBC1D13, EPI64C/TBC1D10C), and in its GTP-bound active form recruits a growing set of effectors—including OCRL, ACAP2, fascin, MICAL-L1, Hrs, NDP52, MICAL1, and myotubularins—to regulate fast endocytic recycling, PtdIns(4,5)P2 hydrolysis and F-actin remodeling at the intercellular bridge for cytokinetic abscission, apico-basal polarity establishment, primary cilia length and composition, synaptic vesicle protein degradation via the ESCRT pathway, LRRK2-dependent α-synuclein propagation through RAB35 phosphorylation, and numerous specialized processes including phagocytosis, neurite outgrowth, exosome secretion, and myelin growth via mTORC1 suppression."},"narrative":{"teleology":[{"year":2006,"claim":"Establishing RAB35 as a plasma membrane/endosomal GTPase required for fast endocytic recycling and cytokinesis resolved the question of where this poorly characterized Rab functions and provided the first cellular phenotype (failed abscission, vacuolar marker accumulation) linking it to membrane traffic.","evidence":"Dominant-negative/GTP-locked mutant overexpression with fluorescence microscopy and endocytic marker trafficking in human cells","pmids":["16950109"],"confidence":"High","gaps":["Identity of Rab35 activators and inactivators unknown","Direct effectors mediating cytokinesis and recycling not identified","Mechanism of PIP2/septin bridge localization unclear"]},{"year":2008,"claim":"Identification of the DENN-domain protein RME-4 as a RAB-35 activator at clathrin-coated pits in C. elegans, and EPI64C/TBC1D10C as a mammalian Rab35 GAP, established the first GEF and GAP for RAB35 and placed it in the clathrin-mediated endocytic pathway upstream of RAB-7 and parallel to RAB-11.","evidence":"C. elegans genetic epistasis, yeast two-hybrid, and in vitro GAP assay with siRNA knockdown in Jurkat T cells","pmids":["18354496","18450757"],"confidence":"High","gaps":["Mammalian DENN-domain GEFs not yet tested","Whether GAP identity varies by cell type unknown","Structural basis for GEF/GAP recognition undefined"]},{"year":2009,"claim":"Discovery that fascin is a direct Rab35 effector linking active Rab35 to actin bundling—demonstrated by ectopic mitochondrial targeting—answered how Rab35 remodels the actin cytoskeleton, while parallel work showed Rab35 activates Cdc42 for neurite outgrowth.","evidence":"Direct pulldown, ectopic mitochondrial recruitment in cultured cells, Drosophila bristle genetics; Cdc42 activation assays and siRNA in PC12/N1E-115 cells","pmids":["19729655","19289122"],"confidence":"High","gaps":["Whether fascin and Cdc42 pathways are independent or connected unknown","Structural basis of Rab35-fascin recognition unresolved"]},{"year":2010,"claim":"Biochemical demonstration that the DENN domains of DENND1A, DENND1B, and DENND1C all catalyze GDP-to-GTP exchange on Rab35 defined the mammalian GEF family, while revealing their differential binding properties and clathrin/AP-2 association linked Rab35 activation to clathrin-coated pit dynamics.","evidence":"In vitro GEF assays, yeast two-hybrid, siRNA knockdown with endosome morphology analysis","pmids":["20159556","20154091"],"confidence":"High","gaps":["Physiological contexts requiring each GEF isoform not determined","Regulation of GEF recruitment itself unresolved"]},{"year":2011,"claim":"Identification of OCRL as a direct Rab35 effector at the intercellular bridge explained how Rab35 controls PtdIns(4,5)P₂ hydrolysis and F-actin clearance for cytokinetic abscission, while parallel studies identified ACAP2 as an effector coupling Rab35 to Arf6 inactivation during phagocytosis and MICAL-L1 as a recycling endosome partner.","evidence":"GST pulldown (direct binding), siRNA depletion, PtdIns(4,5)P₂ and F-actin imaging in human cells and Lowe patient lines; phagocytic cup live imaging in macrophages; co-IP for MICAL-L1","pmids":["21706022","22045739","21951725"],"confidence":"High","gaps":["How Rab35 selects among multiple effectors at different locations unclear","Whether OCRL disease mutations specifically disrupt Rab35 binding not tested"]},{"year":2012,"claim":"Dissection of the ARF6→EPI64B⊣RAB35 GTPase cascade revealed that ARF6 negatively regulates Rab35 loading at clathrin-coated pits, while Rab35 reciprocally suppresses Arf6 via ACAP2, establishing a mutual antagonism that governs integrin/cadherin surface balance, cell migration, and GLUT4 trafficking.","evidence":"Constitutive active/inactive mutant epistasis, GAP activity assays, cadherin/integrin trafficking, GLUT4 translocation in adipocytes, TBC1D13 in vitro GAP screen","pmids":["22226746","23264734","22762500","23197472"],"confidence":"High","gaps":["Whether Rab35-Arf6 antagonism operates identically in all cell types unclear","Structural basis for EPI64B selectivity for Rab35 versus other Rabs unresolved"]},{"year":2014,"claim":"MICAL-L1 was established as a Rab35 effector scaffold that recruits Rab8/13/36 to Arf6-positive endosomes for non-redundant neurite outgrowth regulation, while in oligodendrocytes the Rab35→ACAP2⊣Arf6 cascade was shown to suppress differentiation, revealing cell-type-specific functional switching.","evidence":"siRNA knockdown/rescue epistasis in PC12 cells; GTPase activity measurements and myelination co-culture in oligodendrocytes","pmids":["25086062","24600047"],"confidence":"High","gaps":["Which Rab35 effectors operate in oligodendrocyte differentiation besides ACAP2 unknown","How developmental signals modulate Rab35 activity level unresolved"]},{"year":2015,"claim":"TIRF imaging resolved the precise temporal sequence—DENND1A arrives, EPI64B departs, Rab35 activates, OCRL is recruited—on newborn endosomes within seconds of clathrin-coated vesicle scission, establishing the earliest post-endocytic event controlled by Rab35 and explaining CI-MPR sorting.","evidence":"Live TIRF microscopy, siRNA depletion, direct binding, cargo trafficking assays","pmids":["26725203"],"confidence":"High","gaps":["Whether the same temporal sequence applies at all CCV populations unclear","How Rab35 is removed from maturing endosomes not defined"]},{"year":2016,"claim":"RAB35 was shown to directly bind the cytoplasmic tail of Podocalyxin and tether apical-determinant vesicles at the cleavage site, coupling cytokinesis to apico-basal polarity initiation in 3D epithelial cysts; separately, Hrs was identified as a neuronal Rab35 effector linking activity-dependent synaptic vesicle protein degradation to the ESCRT pathway.","evidence":"3D MDCK cyst cultures with direct pulldown and polarity marker imaging; Co-IP and neuronal activity stimulation in hippocampal neurons","pmids":["27040773","27535913"],"confidence":"High","gaps":["Whether Podocalyxin binding competes with other effectors at the bridge unresolved","Upstream signals activating Rab35 during neuronal stimulation not identified"]},{"year":2017,"claim":"NDP52 was identified as a direct Rab35 effector that promotes selective autophagy (xenophagy, mitophagy) and autophagosome maturation, with TBC1D10A opposing and TBK1 stimulating this process, broadening Rab35 function beyond recycling into degradative pathways.","evidence":"Direct binding assay, Co-IP, siRNA knockdown, bacterial infection and mitophagy models","pmids":["28848034"],"confidence":"High","gaps":["Whether Rab35-NDP52 interaction is constitutive or stimulus-regulated unclear","Quantitative contribution of Rab35 versus other Rabs to NDP52 recruitment not determined"]},{"year":2018,"claim":"LRRK2 was shown to phosphorylate RAB35, and the PD-linked LRRK2 G2019S mutation enhances α-synuclein propagation through this phosphorylation, placing RAB35 as a key downstream mediator in Parkinson's disease pathobiology.","evidence":"Phosphorylation assays, LRRK2 kinase inhibitor treatment, epistasis in C. elegans and rodent models","pmids":["30150626"],"confidence":"High","gaps":["Phosphorylation site(s) on Rab35 and their effect on effector selectivity not fully mapped","Whether Rab35 phosphorylation affects all effector interactions or is selective unclear"]},{"year":2019,"claim":"RAB35 was localized to primary cilia along with its GEF DENND1B and GAP TBC1D10A, and shown to regulate cilium length, Smoothened targeting, and Arl13b/INPP5E composition, with zebrafish morphants displaying left-right asymmetry defects—establishing Rab35 in ciliogenesis.","evidence":"siRNA knockdown, zebrafish morpholinos, GFP localization, ciliary membrane composition analysis","pmids":["31432619"],"confidence":"High","gaps":["Whether Rab35 acts inside the cilium or at the ciliary base unresolved","Effector mediating Smoothened ciliary targeting not identified"]},{"year":2020,"claim":"A Rab35–MTMR13–MTMR2 complex was defined as the mechanism controlling PI 3-phosphate turnover and mTORC1 suppression in Schwann cells; Rab35 knockout in vivo caused focal hypermyelination rescued by mTORC1 inhibition, revealing a lipid-signaling axis for myelin growth control.","evidence":"Co-IP, in vivo Rab35 KO, PI phospholipid measurement, mTORC1 activity assay, pharmacological rescue","pmids":["32503983"],"confidence":"High","gaps":["Whether Rab35-myotubularin axis operates in other myelinating glia unclear","Direct structural basis for Rab35-MTMR13 interaction unresolved"]},{"year":2023,"claim":"DENND2B was identified as a dual GEF and effector for Rab35 at the intercellular bridge, controlling ESCRT-III recruitment and the Aurora B abscission checkpoint; separately, context-specific GEF usage was defined (DENND1A for 3D polarity via ACAP2; FLCN for 2D OCRL-dependent sorting), revealing modular GEF-effector wiring.","evidence":"GEF assay, Co-IP, siRNA knockdown with cytokinesis and ESCRT-III imaging; CRISPR KO in 2D/3D MDCK cultures","pmids":["37454296","31992598"],"confidence":"High","gaps":["How cells select among GEFs at the intercellular bridge not determined","Whether DENND2B dual function is unique or shared with other DENN proteins unclear"]},{"year":2024,"claim":"A human homozygous R27H variant in RAB35 was shown to cause neurodevelopmental disease by trapping RAB35 in an inactive conformation (enhanced GEF binding, reduced effector engagement), with consequent Arf6 hyperactivation, cytokinesis delay, and ciliary defects—providing the first Mendelian disease link and unifying multiple RAB35 functions in a single pathogenic mechanism.","evidence":"Exome sequencing, in vitro GEF and effector binding assays, Arf6 activation measurement, cytokinesis and cilia analysis","pmids":["38432637"],"confidence":"High","gaps":["Number and spectrum of RAB35-associated disease families remain limited","Whether other hypomorphic variants produce milder phenotypes unknown"]},{"year":2024,"claim":"Congenital Rab35 KO is embryonic lethal (E7.5) in mice, and brain-specific KO causes hippocampal lamination defects and behavioral abnormalities, confirming essential in vivo roles; the Shigella effector IcsB was shown to non-canonically acylate Rab35 in its polybasic region to entrap it at bacterial vacuoles.","evidence":"Rab35 KO mice (congenital and brain-specific), behavioral testing, quantitative proteomics; STED microscopy and PTM analysis during Shigella infection","pmids":["37085665","38568808"],"confidence":"High","gaps":["Which Rab35 effectors are critical for embryonic survival unknown","Whether acylation-based hijacking occurs with other pathogens not explored"]},{"year":null,"claim":"A comprehensive structural model of how Rab35 discriminates among its >10 effectors in a spatiotemporal manner is lacking; the phosphorylation code imposed by LRRK2 and potentially other kinases, and how it reshapes effector selectivity, remains undefined.","evidence":"","pmids":[],"confidence":"High","gaps":["No co-crystal structure of Rab35 with any effector exists","Complete phosphorylation site mapping and functional consequences not determined","How Rab35 is partitioned between plasma membrane, endosomes, cilia, and intercellular bridge simultaneously is mechanistically unresolved"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003924","term_label":"GTPase activity","supporting_discovery_ids":[0,8,13,18,24,34,47]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[10,13,15,22,29,33,40]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,37,42]},{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[0,5,21,22]},{"term_id":"GO:0005929","term_label":"cilium","supporting_discovery_ids":[34,47]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[3,11,27]}],"pathway":[{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[0,1,5,15,21,22]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[0,8,43,47]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[28]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[30,33,36]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[2,35,44]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[17,24,49]},{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[34,47]}],"complexes":[],"partners":["OCRL","ACAP2","FSCN1","DENND1A","DENND1B","DENND2B","TBC1D10A","MICAL1"],"other_free_text":[]},"mechanistic_narrative":"RAB35 is a plasma membrane– and endosome-associated small GTPase that functions as a master coordinator of endocytic recycling, membrane identity, and actin remodeling across multiple cellular contexts including cytokinesis, cell polarity, ciliogenesis, phagocytosis, neurite outgrowth, and myelination. In its GTP-bound state, RAB35 recruits a context-dependent set of effectors—OCRL for PtdIns(4,5)P₂ hydrolysis and F-actin clearance at the intercellular bridge and newborn endosomes, ACAP2 for Arf6 inactivation during phagocytosis, neurite outgrowth, and Weibel-Palade body exocytosis, fascin for actin bundling, Hrs/NDP52 for ESCRT-dependent degradation of synaptic vesicle proteins and selective autophagy, MICAL-L1 for downstream Rab cascade scaffolding, and myotubularin phosphatases (MTMR13/MTMR2) for PI 3-phosphate turnover and mTORC1 suppression during myelin growth [PMID:16950109, PMID:21706022, PMID:26725203, PMID:22045739, PMID:19729655, PMID:27535913, PMID:28848034, PMID:25086062, PMID:32503983]. RAB35 is activated by DENN-domain GEFs (DENND1A/B/C, DENND2B, FLCN) and inactivated by TBC-domain GAPs (TBC1D10A/B/C, TBC1D13), forming an ARF6-antagonistic GTPase cascade that controls surface receptor sorting, cadherin stabilization, clathrin-independent cargo fate, and epithelial polarity establishment [PMID:20159556, PMID:22226746, PMID:25988331, PMID:27040773, PMID:31992598, PMID:37454296]. A homozygous R27H missense variant in the RAB35 GTPase domain causes a neurodevelopmental disorder characterized by enhanced GEF binding, reduced effector engagement, Arf6 hyperactivation, and defective cytokinesis and ciliogenesis [PMID:38432637]."},"prefetch_data":{"uniprot":{"accession":"Q15286","full_name":"Ras-related protein Rab-35","aliases":["GTP-binding protein RAY","Ras-related protein Rab-1C"],"length_aa":201,"mass_kda":23.0,"function":"The small GTPases Rab are key regulators of intracellular membrane trafficking, from the formation of transport vesicles to their fusion with membranes. Rabs cycle between an inactive GDP-bound form and an active GTP-bound form that is able to recruit to membranes different sets of downstream effectors directly responsible for vesicle formation, movement, tethering and fusion (PubMed:30905672). RAB35 is involved in the process of endocytosis and is an essential rate-limiting regulator of the fast recycling pathway back to the plasma membrane (PubMed:21951725). During cytokinesis, required for the postfurrowing terminal steps, namely for intercellular bridge stability and abscission, possibly by controlling phosphatidylinositol 4,5-bis phosphate (PIP2) and SEPT2 localization at the intercellular bridge (PubMed:16950109). May indirectly regulate neurite outgrowth. Together with TBC1D13 may be involved in regulation of insulin-induced glucose transporter SLC2A4/GLUT4 translocation to the plasma membrane in adipocytes (By similarity)","subcellular_location":"Cell membrane; Membrane, clathrin-coated pit; Cytoplasmic vesicle, clathrin-coated vesicle; Endosome; Melanosome","url":"https://www.uniprot.org/uniprotkb/Q15286/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/RAB35","classification":"Not Classified","n_dependent_lines":122,"n_total_lines":1208,"dependency_fraction":0.10099337748344371},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000111737","cell_line_id":"CID000433","localizations":[{"compartment":"membrane","grade":3},{"compartment":"vesicles","grade":3},{"compartment":"cell_contact","grade":2},{"compartment":"cytoplasmic","grade":2}],"interactors":[{"gene":"GDI1","stoichiometry":10.0},{"gene":"GDI2","stoichiometry":10.0},{"gene":"CHM","stoichiometry":0.2},{"gene":"TOMM40","stoichiometry":0.2},{"gene":"CHML","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/target/CID000433","total_profiled":1310},"omim":[{"mim_id":"619563","title":"MICAL-LIKE PROTEIN 1; MICALL1","url":"https://www.omim.org/entry/619563"},{"mim_id":"616218","title":"TBC1 DOMAIN FAMILY, MEMBER 13; TBC1D13","url":"https://www.omim.org/entry/616218"},{"mim_id":"614222","title":"WARBURG MICRO SYNDROME 3; WARBM3","url":"https://www.omim.org/entry/614222"},{"mim_id":"613634","title":"DENN/MADD DOMAIN-CONTAINING PROTEIN 1C; DENND1C","url":"https://www.omim.org/entry/613634"},{"mim_id":"613633","title":"DENN/MADD DOMAIN-CONTAINING PROTEIN 1A; DENND1A","url":"https://www.omim.org/entry/613633"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/RAB35"},"hgnc":{"alias_symbol":["H-ray"],"prev_symbol":[]},"alphafold":{"accession":"Q15286","domains":[{"cath_id":"3.40.50.300","chopping":"6-194","consensus_level":"high","plddt":91.2972,"start":6,"end":194}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q15286","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q15286-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q15286-F1-predicted_aligned_error_v6.png","plddt_mean":89.31},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=RAB35","jax_strain_url":"https://www.jax.org/strain/search?query=RAB35"},"sequence":{"accession":"Q15286","fasta_url":"https://rest.uniprot.org/uniprotkb/Q15286.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q15286/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q15286"}},"corpus_meta":[{"pmid":"16950109","id":"PMC_16950109","title":"Rab35 regulates an endocytic recycling pathway essential for the terminal steps of cytokinesis.","date":"2006","source":"Current biology : CB","url":"https://pubmed.ncbi.nlm.nih.gov/16950109","citation_count":311,"is_preprint":false},{"pmid":"21706022","id":"PMC_21706022","title":"Rab35 GTPase and OCRL phosphatase remodel lipids and F-actin for successful cytokinesis.","date":"2011","source":"Nature cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/21706022","citation_count":240,"is_preprint":false},{"pmid":"30943982","id":"PMC_30943982","title":"Long non-coding RNA HOTAIR promotes exosome secretion by regulating RAB35 and SNAP23 in hepatocellular carcinoma.","date":"2019","source":"Molecular cancer","url":"https://pubmed.ncbi.nlm.nih.gov/30943982","citation_count":226,"is_preprint":false},{"pmid":"20159556","id":"PMC_20159556","title":"The Connecdenn DENN domain: a GEF for Rab35 mediating cargo-specific exit from early endosomes.","date":"2010","source":"Molecular 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overexpression, fluorescence microscopy, endocytic marker trafficking assays in human cells\",\n      \"journal\": \"Current biology : CB\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean loss-of-function with defined cellular phenotype, replicated across multiple subsequent studies\",\n      \"pmids\": [\"16950109\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"In C. elegans, RME-4 (a DENN domain protein) binds RAB-35 in its GDP-loaded conformation and is enriched on clathrin-coated pits; RME-4 recruits RAB-35 to coated pits/vesicles, and RAB-35 in turn promotes receptor recycling from early endosomes. Genetic epistasis shows RME-4 and RAB-35 function downstream of clathrin and upstream of RAB-7, acting synergistically with RAB-11 and RME-1.\",\n      \"method\": \"C. elegans genetic screens, yeast two-hybrid, GFP localization, epistasis analysis\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis with multiple orthogonal methods, C. elegans ortholog\",\n      \"pmids\": [\"18354496\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Rab35 is recruited to the immunological synapse (IS) in T cells; EPI64C (TBC1D10C) functions as a Rab35-GAP both in vitro and in transfection assays. Dominant-negative Rab35 or EPI64C impair transferrin recycling in T cells and TCR enrichment at the IS, and conjugate formation is impaired by both Rab35-DN and EPI64C.\",\n      \"method\": \"In vitro GAP assay, transfection of DN constructs, co-localization microscopy, siRNA knockdown in Jurkat T cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro GAP activity demonstrated plus cellular loss-of-function with defined phenotype\",\n      \"pmids\": [\"18450757\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Rab35 directly associates with the actin-bundling protein fascin as an effector; active Rab35 recruits fascin to actin filaments and targeting Rab35 to the outer mitochondrial membrane triggers ectopic actin recruitment. Rab35 regulates actin filament assembly during Drosophila bristle development and filopodia formation in cultured cells.\",\n      \"method\": \"Direct binding assay (pulldown), ectopic mitochondrial targeting, Drosophila genetics, cell culture filopodia assay\",\n      \"journal\": \"Science (New York, N.Y.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct binding demonstrated, ectopic reconstitution confirms sufficiency, replicated in two model systems\",\n      \"pmids\": [\"19729655\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Rab35 colocalizes with Cdc42 and can activate Cdc42 both in vivo and in vitro; activated Rab35 stimulates neurite outgrowth in PC12 and N1E-115 cells via a Cdc42-dependent pathway, and siRNA knockdown of Rab35 abolishes neurite outgrowth.\",\n      \"method\": \"In vitro Cdc42 activation assay, siRNA knockdown, neurite outgrowth quantification, co-localization microscopy\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vitro assay plus KD phenotype, single lab\",\n      \"pmids\": [\"19289122\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"The DENN domain of connecdenn/DENND1A functions as a guanine nucleotide exchange factor (GEF) for Rab35; loss of Rab35 activity causes enlargement of early endosomes, inhibits MHC class I recycling, and prevents early endosomal recruitment of EHD1.\",\n      \"method\": \"In vitro GEF assay, siRNA knockdown, endosome morphology analysis, cargo recycling assay\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — enzymatic GEF activity demonstrated in vitro with defined cellular phenotypes upon loss-of-function\",\n      \"pmids\": [\"20159556\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Connecdenn 2 (DENND1B) also functions as a Rab35 GEF through its DENN domain; all three connecdenns (DENND1A-C) function as Rab35 GEFs with different activity levels. The DENN domains of connecdenn 1 and 2 bind Rab35, whereas connecdenn 3 does not, showing that Rab35 binding and activation are separable functions. All three connecdenns bind clathrin and AP-2 through their C-termini.\",\n      \"method\": \"In vitro GEF assay, yeast two-hybrid, siRNA knockdown, endosome morphology\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro enzymatic activity demonstrated for three family members, binding separability shown\",\n      \"pmids\": [\"20154091\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Rab35 mediates vesicle transport required for phagocytosis in Drosophila; Rab35-dependent recruitment of Cdc42 and Rac1 to sites of filopodium and lamellipodium formation occurs via microtubule tracks.\",\n      \"method\": \"Drosophila genetics, live-cell imaging, immunofluorescence in Drosophila S2 cells\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic loss-of-function with defined trafficking phenotype in Drosophila ortholog\",\n      \"pmids\": [\"20065041\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"GTP-bound (active) Rab35 directly interacts with OCRL (a PtdIns(4,5)P2 5-phosphatase mutated in Lowe syndrome) and controls its localization at the intercellular bridge during cytokinesis; Rab35 or OCRL depletion inhibits cytokinesis abscission with local PtdIns(4,5)P2 and F-actin accumulation, and OCRL acts as an effector of Rab35 to remodel F-actin for abscission.\",\n      \"method\": \"Direct binding assay (GST pulldown), siRNA depletion, PtdIns(4,5)P2 imaging, F-actin quantification, cytokinesis assays in human cells and Lowe patient cell lines\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct interaction demonstrated, multiple orthogonal methods, disease-relevant validation\",\n      \"pmids\": [\"21706022\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"MICAL-L1 is a Rab35-binding partner on tubular recycling endosomes; active Rab35 impairs MICAL-L1 recruitment to tubular recycling endosomes while Rab35 depletion promotes enhanced MICAL-L1 localization, indicating Rab35 is an upstream regulator of MICAL-L1. Arf6 also forms a complex with MICAL-L1 for recruitment to tubular endosomes.\",\n      \"method\": \"Co-immunoprecipitation, overexpression and depletion studies, fluorescence microscopy\",\n      \"journal\": \"Traffic (Copenhagen, Denmark)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — co-IP and cellular imaging, single lab\",\n      \"pmids\": [\"21951725\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Rab35 is required for the early stage of FcγR-mediated phagocytosis in macrophages; active Rab35 recruits ACAP2 (an ARF6 GAP) to the phagocytic cup, and this GTP-Rab35/ACAP2 interaction is required for actin-dependent pseudopod extension and phagosome formation.\",\n      \"method\": \"siRNA knockdown, live-cell imaging, expression of GTP/GDP-locked mutants, pulldown assay, co-localization microscopy in macrophages\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods, direct binding shown, defined phagocytic phenotype\",\n      \"pmids\": [\"22045739\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Connecdenn 3 (DENND1C) directly binds actin via a unique C-terminal motif not found in connecdenn 1 or 2, coupling Rab35 activation to the actin cytoskeleton; connecdenn 3 co-localizes with fascin and actin filaments, identifying it as the relevant GEF for Rab35-mediated actin regulation and membrane protrusion formation.\",\n      \"method\": \"Direct actin-binding assay, GEF assay, co-localization microscopy, cell morphology analysis\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct binding demonstrated, GEF activity confirmed, functional consequences shown\",\n      \"pmids\": [\"22072793\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"A genome-wide RUN domain screen identified RUSC2 as a GTP-Rab35-specific binding protein; the minimal Rab35-binding site of RUSC2 (residues 982-1199) was defined and used to develop RBD35, a GTP-Rab35 trapper that specifically pulls down active Rab35 and inhibits neurite outgrowth when overexpressed.\",\n      \"method\": \"Yeast two-hybrid genome-wide screen, in vitro pull-down, PC12 cell overexpression assay\",\n      \"journal\": \"Cell structure and function\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genome-wide screen with biochemical validation and functional tool development\",\n      \"pmids\": [\"21737958\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"ARF6 negatively regulates Rab35 activation via the Rab35 GAP EPI64B, which acts as an ARF6 effector; constitutively active ARF6 causes identical endocytic recycling and cytokinesis defects as GDP-Rab35. This ARF6/Rab35 GTPase cascade operates at clathrin-coated pits where activated ARF6 reduces Rab35 loading into the endocytic pathway.\",\n      \"method\": \"Constitutively active/inactive mutant expression, GAP activity assays, cytokinesis assays, endocytic recycling assays in human cells\",\n      \"journal\": \"Current biology : CB\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — cascade dissected with multiple mutants and orthogonal assays, mechanistic pathway placement\",\n      \"pmids\": [\"22226746\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Rab35 functions as a Rab35 effector and Arf6-GAP coupling mechanism through centaurin-β2 (ACAP2): Rab35 accumulates at Arf6-positive endosomes upon NGF stimulation and recruits centaurin-β2 in a Rab35-dependent manner; the Arf6-GAP activity of centaurin-β2 at these endosomes is indispensable for NGF-induced neurite outgrowth in PC12 cells.\",\n      \"method\": \"siRNA knockdown, rescue experiments, live-cell imaging, co-localization assays in PC12 cells\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis with knockdown and rescue, defined pathway placement\",\n      \"pmids\": [\"22344257\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Rab35 suppresses Arf6 activity to downregulate Arf6-dependent recycling of β1-integrin and EGF receptors, while simultaneously maintaining cadherins at the cell surface; Rab35 knockdown promotes cell migration consistent with epithelial-mesenchymal transition by inverting this balance.\",\n      \"method\": \"siRNA knockdown, cell adhesion and migration assays, cargo recycling assays, co-immunoprecipitation\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods showing coordinated regulation of two trafficking pathways\",\n      \"pmids\": [\"23264734\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Rab35 regulates cadherin trafficking and stabilization at cell-cell contacts in myoblasts and HeLa cells; Rab35 is required for N- and M-cadherin recruitment to cell contacts, their association with p120 catenin, and for PIP5KIγ accumulation at contacts for PIP2 production. Rab35 knockdown impairs myoblast fusion.\",\n      \"method\": \"siRNA knockdown, dominant-negative expression, fluorescence microscopy, co-immunoprecipitation, myoblast fusion assay\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods, defined phenotypic readouts\",\n      \"pmids\": [\"23197472\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"In Drosophila tracheal terminal cells, Rab35 and its apical membrane-localized GAP Whacked polarize seamless tube growth along the proximodistal axis; loss of Whacked (or constitutive Rab35 activation) leads to tube overgrowth at branch tips, while overexpression of Whacked or dominant-negative Rab35 causes ectopic tubes near the nucleus.\",\n      \"method\": \"Drosophila genetics (loss-of-function mutants), live imaging, epistasis analysis\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — Drosophila ortholog, genetic epistasis with defined morphological phenotype\",\n      \"pmids\": [\"22407366\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"TBC1D13 functions as a Rab35-specific GAP in vitro; overexpression of constitutively active Rab35 (but not Rab10) reverses the TBC1D13-dependent block in insulin-stimulated GLUT4 translocation in adipocytes, implicating Rab35 in the insulin-stimulated GLUT4 trafficking pathway.\",\n      \"method\": \"In vitro GAP activity screen, yeast two-hybrid, constitutively active mutant rescue, GLUT4 translocation assay in adipocytes\",\n      \"journal\": \"Traffic (Copenhagen, Denmark)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro GAP activity demonstrated, cellular rescue experiment with specific mutant\",\n      \"pmids\": [\"22762500\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Rab35 promotes neurite outgrowth via MICAL-L1 as a scaffold: Rab35 determines the intracellular localization of MICAL-L1, which in turn recruits Rab8, Rab13, and Rab36 to Arf6-positive recycling endosomes. Each downstream Rab regulates neurite outgrowth non-redundantly downstream of Rab35 and MICAL-L1.\",\n      \"method\": \"Functional ablation (siRNA), rescue experiments, co-localization microscopy, neurite outgrowth quantification in PC12 cells\",\n      \"journal\": \"Biology open\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — epistatic pathway dissected with knockdown and rescue, multiple downstream Rabs characterized\",\n      \"pmids\": [\"25086062\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Rab35 and its effector ACAP2 negatively regulate oligodendrocyte differentiation and myelination by inactivating Arf6; as differentiation initiates, Rab35 and ACAP2 activities decrease while Arf6 activity increases. Arf6 knockdown inhibits differentiation, placing Rab35/ACAP2 upstream of Arf6 in a GTPase switching mechanism.\",\n      \"method\": \"siRNA knockdown, GTPase activity assays, morphological differentiation scoring, myelination co-culture\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — epistasis established with multiple knockdowns and activity measurements\",\n      \"pmids\": [\"24600047\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Rab35 is activated on newborn endosomes immediately after CCV scission via precise spatial-temporal loading: DENND1A is recruited first, then EPI64B disappears, allowing Rab35 activation; active Rab35 then directly recruits the OCRL phosphatase for post-scission PtdIns(4,5)P2 hydrolysis. Depletion of Rab35 or OCRL leads to retention of CI-MPR in peripheral clathrin-positive PtdIns(4,5)P2-rich endosomes.\",\n      \"method\": \"Live TIRF microscopy, siRNA depletion, cargo trafficking assays, direct binding assay, PtdIns(4,5)P2 imaging\",\n      \"journal\": \"Current biology : CB\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct interaction demonstrated, TIRF imaging provides high spatial-temporal resolution, multiple orthogonal approaches\",\n      \"pmids\": [\"26725203\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Rab35 controls endosomal sorting of clathrin-independent endocytosis (CIE) cargo; Rab35 delivered via clathrin-mediated endocytosis inactivates Arf6 through ACAPs (Arf6 GAPs), maintaining tubular endosomal networks and preventing lysosomal degradation of CIE cargos (CD44, CD98, CD147). siRNA knockdown of Rab35 recreates the altered trafficking phenotype of CME inhibition.\",\n      \"method\": \"siRNA knockdown, CME inhibition, cargo trafficking assays, Arf6-GTP measurement, rescue by Rab35 or ACAPs expression\",\n      \"journal\": \"Traffic (Copenhagen, Denmark)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — mechanistic rescue experiments establish pathway, multiple orthogonal methods\",\n      \"pmids\": [\"25988331\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Two threonine residues (Thr-76 and Thr-81) in the switch II region of Rab35 are specifically required for binding ACAP2 (centaurin-β2) but dispensable for other Rab35 interactions; two asparagine residues (Asn-610 and Asn-691) in ACAP2 are key for Rab35 recognition. Binding-deficient mutants of either protein fail to support neurite outgrowth in PC12 cells.\",\n      \"method\": \"Deletion/point mutagenesis, pulldown assays, knockdown-rescue in PC12 cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — structure-function mutagenesis with functional rescue, defines binding interface\",\n      \"pmids\": [\"25694427\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Rab35 directly couples cytokinesis with initiation of apico-basal polarity in 3D MDCK cyst cultures by tethering intracellular vesicles containing apical determinants (aPKC, Cdc42, Crumbs3, Podocalyxin) at the cleavage site through a direct interaction between Rab35 and the cytoplasmic tail of Podocalyxin. Rab35 inactivation leads to complete polarity inversion in 3D cysts.\",\n      \"method\": \"3D MDCK cyst cultures, dominant-negative expression, direct binding (pulldown), co-localization microscopy, polarity marker imaging\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct binding demonstrated, defined molecular mechanism with functional consequence\",\n      \"pmids\": [\"27040773\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Neuronal activity drives Rab35 activation and binding to the ESCRT-0 protein Hrs, identified as a novel Rab35 effector; Rab35 activation and Hrs binding recruit downstream ESCRT machinery to synaptic vesicle pools to initiate activity-dependent SV protein degradation.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, live-cell imaging, neuronal activity stimulation in rat hippocampal neurons\",\n      \"journal\": \"The Journal of neuroscience : the official journal of the Society for Neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — novel effector identified by Co-IP, defined pathway with activity-dependent readout\",\n      \"pmids\": [\"27535913\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Rab35 promotes axon elongation in primary neurons; PRPK (p53-related protein kinase) negatively regulates axonal elongation by targeting Rab35 for ubiquitin-proteasome degradation, and MAP1B interacts with PRPK to prevent this degradation. Rab35 also regulates Cdc42 activity in neurons.\",\n      \"method\": \"siRNA knockdown, ubiquitin-proteasome pathway assays, MAP1B KO neurons, rescue by Rab35 overexpression or PRPK inactivation, epistasis analysis\",\n      \"journal\": \"The Journal of neuroscience : the official journal of the Society for Neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods, defined epistatic relationships, first evidence for Rab proteasomal regulation\",\n      \"pmids\": [\"27383602\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Rab35 in Drosophila epithelium is dynamically planar-polarized, enriched at contractile interfaces of intercalating cells; disruption of Rab35 function allows oscillations but prevents ratchet-like stabilization of contractions, so interfaces fail to shorten. Rab35 compartment initiation does not require Myosin II but compartments fail to terminate without actomyosin.\",\n      \"method\": \"Drosophila genetics, live imaging, dominant-negative expression, Myosin II perturbation\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — Drosophila ortholog, genetic perturbations with quantitative live imaging\",\n      \"pmids\": [\"28883443\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"GTP-bound Rab35 directly binds and recruits the autophagy receptor NDP52 to bacteria-containing endosomes and promotes NDP52 interaction with ubiquitin; TBC1D10A (GAP) inhibits this process while TBK1 (associated with NDP52) stimulates it. Rab35 also promotes NDP52 recruitment to damaged mitochondria and autophagosomes for mitophagy and autophagosome maturation.\",\n      \"method\": \"Direct binding assay, Co-IP, siRNA knockdown, bacterial infection model, mitophagy assay\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct binding demonstrated, multiple autophagy contexts tested with orthogonal methods\",\n      \"pmids\": [\"28848034\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Rab35 is required for evoked Weibel-Palade body (WPB) exocytosis in endothelial cells; TBC1D10A is its GAP in this context. Rab35 acts through ACAP2 as an effector, and ACAP2 negatively regulates WPB exocytosis, while Arf6 (downstream of ACAP2) supports exocytosis.\",\n      \"method\": \"Genome-wide RabGAP screen, RabGAP overexpression, pulldown, co-IP, siRNA knockdown, WPB exocytosis assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genome-wide screen, direct binding confirmed, pathway cascade defined with multiple perturbations\",\n      \"pmids\": [\"28566286\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"LRRK2 kinase phosphorylates RAB35 to modulate α-synuclein propagation; the PD-linked G2019S mutation in LRRK2, which increases kinase activity, enhances α-synuclein propagation efficiency. Constitutive activation of RAB35 overrides reduced α-synuclein propagation in lrk-1 mutant C. elegans, placing RAB35 downstream of LRRK2 in this pathway.\",\n      \"method\": \"Cell culture, C. elegans genetics, rodent model, LRRK2 kinase inhibitor treatment, phosphorylation assays, epistasis\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — phosphorylation demonstrated, epistasis in multiple model organisms, kinase inhibitor rescue\",\n      \"pmids\": [\"30150626\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"RAB35 is required for apoptotic cell recognition and phagosome maturation in C. elegans as a third, parallel pathway to CED-1 and CED-5; RAB-35 promotes the phagosomal PI(4,5)P2-to-PI(3)P shift and recruits RAB-5 to phagosomal surfaces. GEFs FLCN-1 and RME-4, and GAP TBC-10, regulate RAB-35 in this context.\",\n      \"method\": \"C. elegans genetic screen, epistasis analysis, phosphoinositide imaging, phagosome maturation assays\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — C. elegans ortholog, genetic epistasis with defined molecular pathway, multiple orthogonal assays\",\n      \"pmids\": [\"30138370\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"In C. elegans linker cell-type death (LCD), RAB-35 GTPase coordinates competitive phagocytosis onset and cell degradation; RAB-35 binds CNT-1, an ARF-6 GAP, and removes ARF-6 from phagosome membranes, facilitating PI(4,5)P2 removal and promoting phagolysosome maturation.\",\n      \"method\": \"Microfluidics-based long-term in vivo imaging, C. elegans genetics, phosphoinositide imaging, epistasis analysis\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — C. elegans ortholog, direct binding shown, defined molecular pathway with in vivo imaging\",\n      \"pmids\": [\"30220571\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"RAB35 directly regulates p85/PI3K activity to control oscillatory circular dorsal ruffles (CDRs) required for chemotactic migration; RAB35 is necessary and sufficient for growth factor-induced CDR waves and essential for chemotactic migration and chemoinvasion.\",\n      \"method\": \"RNAi screen, live-cell imaging, PI3K activity assay, chemotaxis assay, CDR quantification\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — RNAi-based screen with mechanistic follow-up, direct PI3K regulatory role established\",\n      \"pmids\": [\"29662076\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Rab35 controls cilium length, function, and membrane composition; Rab35 localizes to cilia along with its GEF (DENND1B) and GAP (TBC1D10A) regulators. Rab35 promotes ciliary targeting of Smoothened, limits ciliary accumulation of Arl13b and INPP5E, regulates ciliary PI(4,5)P2 levels, and interacts with Arl13b. Loss of Rab35 causes left-right asymmetry defects in zebrafish.\",\n      \"method\": \"siRNA knockdown, morpholinos (zebrafish), knockout, GFP localization, ciliary membrane composition analysis\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple model systems, direct localization, GEF/GAP regulators also localize to cilia, defined phenotypes\",\n      \"pmids\": [\"31432619\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"IL-17A induces recruitment of Rab35 and DENND1C (GEF) to the IL-17R/Act1 complex in airway smooth muscle cells, activating Rab35; Rab35 activation is required for PKCα activation and fascin phosphorylation at Ser39, allowing F-actin/myosin stress fiber formation and enhanced smooth muscle contraction.\",\n      \"method\": \"Co-IP, siRNA knockdown, PKCα inhibitor treatment, actin stress fiber imaging, muscle contraction assay\",\n      \"journal\": \"Journal of immunology (Baltimore, Md. : 1950)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — receptor-level recruitment shown, signaling cascade dissected with multiple perturbations\",\n      \"pmids\": [\"30683702\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Rab35 controls myelin growth by forming a complex with myotubularin-related PI 3-phosphatases MTMR13 and MTMR2; Rab35-dependent lipid turnover by myotubularins downregulates PI 3-phosphate levels and mTORC1 activity. Targeted disruption of Rab35 causes elevated PI 3-phosphates, hyperactivation of mTORC1, and focal hypermyelination in vivo, rescued by pharmacological inhibition of PI(3,5)P2 synthesis or mTORC1.\",\n      \"method\": \"Co-IP (complex formation), in vivo Rab35 knockout, PI phospholipid measurement, mTORC1 activity assay, pharmacological rescue\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct complex formation, in vivo KO with defined molecular pathway, pharmacological rescue\",\n      \"pmids\": [\"32503983\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"The C-terminal polybasic cluster (approximately 30 amino acids) of Rab35 is critical for its plasma membrane localization; reducing the number of basic amino acids in this region shifts Rab35 localization from the plasma membrane to the Golgi membrane.\",\n      \"method\": \"Rab35-Rab10 chimera constructs, confocal microscopy of EGFP-fused chimeras\",\n      \"journal\": \"Acta histochemica et cytochemica\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — domain swap experiment defines localization determinant with direct microscopy\",\n      \"pmids\": [\"32873993\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Rab35 promotes tunneling nanotube (TNT) formation and TNT-mediated vesicle transfer in neuronal cells; Rab35-GTP, ACAP2, ARF6-GDP, and EHD1 act in a cascade to promote TNT formation, while MICAL-L1 (required for neurite outgrowth) is not required for TNTs, indicating distinct pathway branching.\",\n      \"method\": \"Overexpression of GTP/GDP-locked mutants, dominant-negative expression, TNT quantification, vesicle transfer assay\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — cascade dissected with defined mutants, novel cellular function identified\",\n      \"pmids\": [\"33033331\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"BAG3 interacts with TBC1D10B (EPI64B, the Rab35 GAP) via a BAG3-HSP70-TBC1D10B complex that attenuates TBC1D10B's ability to inactivate RAB35; this supports RAB35 activation and HRS recruitment to initiate ESCRT-mediated endosomal tau clearance. BAG3-TBC1D10B colocalization is reduced in AD brains.\",\n      \"method\": \"Mass spectrometry (BAG3 interactome), Co-IP, live-cell imaging, BAG3 overexpression in P301S tau transgenic mice, IHC in human AD brains\",\n      \"journal\": \"Biological psychiatry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — MS interactome plus multiple biochemical assays, in vivo validation\",\n      \"pmids\": [\"35000752\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Rab35 negatively regulates Aβ production by sorting APP and BACE1 out of the endosomal network; Rab35 coordinates distinct trafficking steps for BACE1 and APP mediated by its effectors OCRL and ACAP2, respectively. Rab35 overexpression prevents amyloidogenic trafficking of APP and BACE1 induced by high glucocorticoid levels.\",\n      \"method\": \"Overexpression and knockdown, APP/BACE1 localization assays, Aβ production measurement, dominant-negative effector expression\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — distinct effector pathways for two substrates defined, functional consequence (Aβ production) measured\",\n      \"pmids\": [\"34876559\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Rab35 regulates insulin secretion in pancreatic β cells and interacts with phogrin (a marker of insulin granule exocytosis); Rab35 overexpression promotes insulin secretion and decreases phogrin expression, while Rab35 silencing inhibits insulin secretion and causes phogrin redistribution. The Rab35/phogrin interaction was confirmed by GST pulldown, co-IP, and co-localization.\",\n      \"method\": \"GST pulldown, co-IP, co-localization microscopy, insulin secretion assay in β-TC-6 cells\",\n      \"journal\": \"Clinical and experimental pharmacology & physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct interaction demonstrated, functional phenotype defined, single lab\",\n      \"pmids\": [\"34448213\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"PI(4,5)P2 recruits Rab35 to migrasome formation sites by interacting with the C-terminal polybasic cluster of Rab35; active Rab35 then promotes migrasome formation by recruiting and concentrating integrin α5 at these sites, likely via direct Rab35-integrin α5 interaction.\",\n      \"method\": \"Live imaging, PI(4,5)P2 manipulation, Rab35 mutant expression, integrin α5 co-localization and pulldown\",\n      \"journal\": \"Cell research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct molecular interaction, defined upstream signal (PI(4,5)P2) and downstream effector (integrin α5)\",\n      \"pmids\": [\"37142675\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"DENND2B functions as a Rab35 GEF that recruits and activates Rab35 at the intercellular bridge (ICB) during cytokinesis; DENND2B's N-terminal region also interacts with active Rab35, making it both a GEF and effector. Knockdown of DENND2B delays abscission, causes multinucleation, F-actin accumulation at the ICB, impairs ESCRT-III recruitment, forms chromatin bridges, and activates the Aurora B NoCut/abscission checkpoint.\",\n      \"method\": \"GEF activity assay, Co-IP, siRNA knockdown, cytokinesis assays, ESCRT-III imaging, Aurora B activation measurement\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — GEF activity demonstrated, dual GEF/effector function established, defined abscission checkpoint pathway\",\n      \"pmids\": [\"37454296\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"The Chlamydia trachomatis effector CpoS interacts with Rab35 to suppress STING-dependent type I interferon responses; depletion of Rab35 phenocopies exacerbated interferon responses seen during CpoS-deficient infection, and CpoS mediates transport of sphingolipids to the inclusion via Rab GTPase interaction.\",\n      \"method\": \"Genetic complementation with CpoS variants, Rab35 siRNA knockdown, interferon response measurement, lipid transport assay\",\n      \"journal\": \"mBio\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Rab35 depletion phenocopies bacterial mutant, mechanistic link between trafficking and innate immunity\",\n      \"pmids\": [\"37530528\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"DENND1A and folliculin (FLCN) function as distinct Rab35 GEFs in different cellular contexts: in 3D MDCK cysts, only DENND1A knockout phenocopies Rab35 KO for podocalyxin (PODXL) mis-sorting, while FLCN knockdown phenocopies Rab35 KD in 2D cultures. The FLCN-Rab35-OCRL and DENND1A-Rab35-ACAP2 axes define two distinct functional cascades.\",\n      \"method\": \"siRNA knockdown, CRISPR knockout, PODXL trafficking assays in 2D and 3D MDCK cultures\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — systematic GEF comparison with CRISPR KO and rescue, two distinct cascades defined\",\n      \"pmids\": [\"31992598\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"USP32, a deubiquitylase, binds Rab35 and protects it from proteasomal degradation by reducing K48-ubiquitination; ETV1 transcription factor promotes USP32 expression in GISTs, and loss of Rab35 decreases exosome secretion and transmission of imatinib resistance.\",\n      \"method\": \"Co-IP, iTRAQ proteomics, ubiquitin assays, knockdown/overexpression, exosome quantification\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct interaction and ubiquitination site defined, deubiquitylase mechanism established\",\n      \"pmids\": [\"36725886\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"A homozygous missense variant R27H in the GTPase fold of RAB35 causes a neurodevelopmental disorder; functional analysis shows R27H-Rab35 has enhanced interaction with its GEF DENND1A and decreased interaction with effector MICAL1, indicating an inactive conformation. R27H expression activates Arf6 (under negative Rab35 control), delays cytokinesis, and alters primary cilia length, number, and Arl13b composition.\",\n      \"method\": \"Exome sequencing, in vitro binding assays (GEF and effector interactions), Arf6 activation assay, cytokinesis assay, primary cilia analysis in patient variant\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — variant protein characterized biochemically with multiple assays, pathogenic mechanism defined\",\n      \"pmids\": [\"38432637\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"The Shigella effector IcsB post-translationally acylates Rab35 in its polybasic region (lysine Nε-fatty acylation), non-canonically entrapping Rab35 at the bacterial-containing vacuole (BCV); Rab35 and IcsB are required not for initial BCV breakage but for unwrapping damaged BCV remnants from Shigella after vacuolar rupture.\",\n      \"method\": \"STED super-resolution microscopy, bacterial genetics (IcsB mutants), post-translational modification analysis, infection assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — novel PTM (bacterial acylation) demonstrated, STED imaging at nanoscale resolution, genetic dissection\",\n      \"pmids\": [\"38568808\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Congenital Rab35 knockout in mice causes embryonic lethality at E7.5; brain-specific Rab35 knockout causes severe defects in hippocampal lamination due to impaired pyramidal neuron distribution, and these mice show spatial memory and anxiety-related behavioral defects. Loss of RAB35 affects other RAB proteins associated with endocytic trafficking and cell adhesion molecules including contactin-2.\",\n      \"method\": \"Rab35 knockout mice (congenital and brain-specific), quantitative proteomics, behavioral testing, histology\",\n      \"journal\": \"Communications biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo KO with defined phenotype, quantitative proteomics for molecular consequences\",\n      \"pmids\": [\"37085665\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Retromer directly associates with the RAB35 regulator TBC1D13 at the endosomal retrieval sub-domain, revealed by proximity proteomics and X-ray crystallography combined with biochemical validation, indicating Retromer is a hub for RAB35 GTPase cycle regulation at endosomes.\",\n      \"method\": \"Comparative proximity proteomics, X-ray crystallography, in silico predictions, biochemical validation\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 preprint — structural and biochemical evidence, but not yet peer-reviewed\",\n      \"pmids\": [\"bio_10.1101_2024.11.22.622898\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"MICAL1, activated by Rab35 at HIV-1 budding sites, locally depolymerizes branched actin networks to promote HIV-1 budding and release; Rab35 is recruited at budding sites and functions in the same pathway as MICAL1, and both are required for viral release. MICAL1 controls timely ESCRT scission machinery recruitment during budding.\",\n      \"method\": \"Super-resolution microscopy, siRNA knockdown, Arp2/3 inhibition rescue, ESCRT recruitment imaging\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 preprint — multiple orthogonal methods, pathway placement, not yet peer-reviewed\",\n      \"pmids\": [\"bio_10.1101_2024.10.07.616958\"],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"RAB35 is a plasma membrane- and endosome-localized small GTPase that is activated by DENN-domain GEFs (DENND1A/B/C, DENND2B, FLCN) and inactivated by GAPs (EPI64B/TBC1D10A/B/C, TBC1D13, EPI64C/TBC1D10C), and in its GTP-bound active form recruits a growing set of effectors—including OCRL, ACAP2, fascin, MICAL-L1, Hrs, NDP52, MICAL1, and myotubularins—to regulate fast endocytic recycling, PtdIns(4,5)P2 hydrolysis and F-actin remodeling at the intercellular bridge for cytokinetic abscission, apico-basal polarity establishment, primary cilia length and composition, synaptic vesicle protein degradation via the ESCRT pathway, LRRK2-dependent α-synuclein propagation through RAB35 phosphorylation, and numerous specialized processes including phagocytosis, neurite outgrowth, exosome secretion, and myelin growth via mTORC1 suppression.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"RAB35 is a plasma membrane– and endosome-associated small GTPase that functions as a master coordinator of endocytic recycling, membrane identity, and actin remodeling across multiple cellular contexts including cytokinesis, cell polarity, ciliogenesis, phagocytosis, neurite outgrowth, and myelination. In its GTP-bound state, RAB35 recruits a context-dependent set of effectors—OCRL for PtdIns(4,5)P₂ hydrolysis and F-actin clearance at the intercellular bridge and newborn endosomes, ACAP2 for Arf6 inactivation during phagocytosis, neurite outgrowth, and Weibel-Palade body exocytosis, fascin for actin bundling, Hrs/NDP52 for ESCRT-dependent degradation of synaptic vesicle proteins and selective autophagy, MICAL-L1 for downstream Rab cascade scaffolding, and myotubularin phosphatases (MTMR13/MTMR2) for PI 3-phosphate turnover and mTORC1 suppression during myelin growth [PMID:16950109, PMID:21706022, PMID:26725203, PMID:22045739, PMID:19729655, PMID:27535913, PMID:28848034, PMID:25086062, PMID:32503983]. RAB35 is activated by DENN-domain GEFs (DENND1A/B/C, DENND2B, FLCN) and inactivated by TBC-domain GAPs (TBC1D10A/B/C, TBC1D13), forming an ARF6-antagonistic GTPase cascade that controls surface receptor sorting, cadherin stabilization, clathrin-independent cargo fate, and epithelial polarity establishment [PMID:20159556, PMID:22226746, PMID:25988331, PMID:27040773, PMID:31992598, PMID:37454296]. A homozygous R27H missense variant in the RAB35 GTPase domain causes a neurodevelopmental disorder characterized by enhanced GEF binding, reduced effector engagement, Arf6 hyperactivation, and defective cytokinesis and ciliogenesis [PMID:38432637].\",\n  \"teleology\": [\n    {\n      \"year\": 2006,\n      \"claim\": \"Establishing RAB35 as a plasma membrane/endosomal GTPase required for fast endocytic recycling and cytokinesis resolved the question of where this poorly characterized Rab functions and provided the first cellular phenotype (failed abscission, vacuolar marker accumulation) linking it to membrane traffic.\",\n      \"evidence\": \"Dominant-negative/GTP-locked mutant overexpression with fluorescence microscopy and endocytic marker trafficking in human cells\",\n      \"pmids\": [\"16950109\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of Rab35 activators and inactivators unknown\", \"Direct effectors mediating cytokinesis and recycling not identified\", \"Mechanism of PIP2/septin bridge localization unclear\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Identification of the DENN-domain protein RME-4 as a RAB-35 activator at clathrin-coated pits in C. elegans, and EPI64C/TBC1D10C as a mammalian Rab35 GAP, established the first GEF and GAP for RAB35 and placed it in the clathrin-mediated endocytic pathway upstream of RAB-7 and parallel to RAB-11.\",\n      \"evidence\": \"C. elegans genetic epistasis, yeast two-hybrid, and in vitro GAP assay with siRNA knockdown in Jurkat T cells\",\n      \"pmids\": [\"18354496\", \"18450757\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mammalian DENN-domain GEFs not yet tested\", \"Whether GAP identity varies by cell type unknown\", \"Structural basis for GEF/GAP recognition undefined\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Discovery that fascin is a direct Rab35 effector linking active Rab35 to actin bundling—demonstrated by ectopic mitochondrial targeting—answered how Rab35 remodels the actin cytoskeleton, while parallel work showed Rab35 activates Cdc42 for neurite outgrowth.\",\n      \"evidence\": \"Direct pulldown, ectopic mitochondrial recruitment in cultured cells, Drosophila bristle genetics; Cdc42 activation assays and siRNA in PC12/N1E-115 cells\",\n      \"pmids\": [\"19729655\", \"19289122\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether fascin and Cdc42 pathways are independent or connected unknown\", \"Structural basis of Rab35-fascin recognition unresolved\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Biochemical demonstration that the DENN domains of DENND1A, DENND1B, and DENND1C all catalyze GDP-to-GTP exchange on Rab35 defined the mammalian GEF family, while revealing their differential binding properties and clathrin/AP-2 association linked Rab35 activation to clathrin-coated pit dynamics.\",\n      \"evidence\": \"In vitro GEF assays, yeast two-hybrid, siRNA knockdown with endosome morphology analysis\",\n      \"pmids\": [\"20159556\", \"20154091\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological contexts requiring each GEF isoform not determined\", \"Regulation of GEF recruitment itself unresolved\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Identification of OCRL as a direct Rab35 effector at the intercellular bridge explained how Rab35 controls PtdIns(4,5)P₂ hydrolysis and F-actin clearance for cytokinetic abscission, while parallel studies identified ACAP2 as an effector coupling Rab35 to Arf6 inactivation during phagocytosis and MICAL-L1 as a recycling endosome partner.\",\n      \"evidence\": \"GST pulldown (direct binding), siRNA depletion, PtdIns(4,5)P₂ and F-actin imaging in human cells and Lowe patient lines; phagocytic cup live imaging in macrophages; co-IP for MICAL-L1\",\n      \"pmids\": [\"21706022\", \"22045739\", \"21951725\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How Rab35 selects among multiple effectors at different locations unclear\", \"Whether OCRL disease mutations specifically disrupt Rab35 binding not tested\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Dissection of the ARF6→EPI64B⊣RAB35 GTPase cascade revealed that ARF6 negatively regulates Rab35 loading at clathrin-coated pits, while Rab35 reciprocally suppresses Arf6 via ACAP2, establishing a mutual antagonism that governs integrin/cadherin surface balance, cell migration, and GLUT4 trafficking.\",\n      \"evidence\": \"Constitutive active/inactive mutant epistasis, GAP activity assays, cadherin/integrin trafficking, GLUT4 translocation in adipocytes, TBC1D13 in vitro GAP screen\",\n      \"pmids\": [\"22226746\", \"23264734\", \"22762500\", \"23197472\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether Rab35-Arf6 antagonism operates identically in all cell types unclear\", \"Structural basis for EPI64B selectivity for Rab35 versus other Rabs unresolved\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"MICAL-L1 was established as a Rab35 effector scaffold that recruits Rab8/13/36 to Arf6-positive endosomes for non-redundant neurite outgrowth regulation, while in oligodendrocytes the Rab35→ACAP2⊣Arf6 cascade was shown to suppress differentiation, revealing cell-type-specific functional switching.\",\n      \"evidence\": \"siRNA knockdown/rescue epistasis in PC12 cells; GTPase activity measurements and myelination co-culture in oligodendrocytes\",\n      \"pmids\": [\"25086062\", \"24600047\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Which Rab35 effectors operate in oligodendrocyte differentiation besides ACAP2 unknown\", \"How developmental signals modulate Rab35 activity level unresolved\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"TIRF imaging resolved the precise temporal sequence—DENND1A arrives, EPI64B departs, Rab35 activates, OCRL is recruited—on newborn endosomes within seconds of clathrin-coated vesicle scission, establishing the earliest post-endocytic event controlled by Rab35 and explaining CI-MPR sorting.\",\n      \"evidence\": \"Live TIRF microscopy, siRNA depletion, direct binding, cargo trafficking assays\",\n      \"pmids\": [\"26725203\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether the same temporal sequence applies at all CCV populations unclear\", \"How Rab35 is removed from maturing endosomes not defined\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"RAB35 was shown to directly bind the cytoplasmic tail of Podocalyxin and tether apical-determinant vesicles at the cleavage site, coupling cytokinesis to apico-basal polarity initiation in 3D epithelial cysts; separately, Hrs was identified as a neuronal Rab35 effector linking activity-dependent synaptic vesicle protein degradation to the ESCRT pathway.\",\n      \"evidence\": \"3D MDCK cyst cultures with direct pulldown and polarity marker imaging; Co-IP and neuronal activity stimulation in hippocampal neurons\",\n      \"pmids\": [\"27040773\", \"27535913\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether Podocalyxin binding competes with other effectors at the bridge unresolved\", \"Upstream signals activating Rab35 during neuronal stimulation not identified\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"NDP52 was identified as a direct Rab35 effector that promotes selective autophagy (xenophagy, mitophagy) and autophagosome maturation, with TBC1D10A opposing and TBK1 stimulating this process, broadening Rab35 function beyond recycling into degradative pathways.\",\n      \"evidence\": \"Direct binding assay, Co-IP, siRNA knockdown, bacterial infection and mitophagy models\",\n      \"pmids\": [\"28848034\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether Rab35-NDP52 interaction is constitutive or stimulus-regulated unclear\", \"Quantitative contribution of Rab35 versus other Rabs to NDP52 recruitment not determined\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"LRRK2 was shown to phosphorylate RAB35, and the PD-linked LRRK2 G2019S mutation enhances α-synuclein propagation through this phosphorylation, placing RAB35 as a key downstream mediator in Parkinson's disease pathobiology.\",\n      \"evidence\": \"Phosphorylation assays, LRRK2 kinase inhibitor treatment, epistasis in C. elegans and rodent models\",\n      \"pmids\": [\"30150626\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Phosphorylation site(s) on Rab35 and their effect on effector selectivity not fully mapped\", \"Whether Rab35 phosphorylation affects all effector interactions or is selective unclear\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"RAB35 was localized to primary cilia along with its GEF DENND1B and GAP TBC1D10A, and shown to regulate cilium length, Smoothened targeting, and Arl13b/INPP5E composition, with zebrafish morphants displaying left-right asymmetry defects—establishing Rab35 in ciliogenesis.\",\n      \"evidence\": \"siRNA knockdown, zebrafish morpholinos, GFP localization, ciliary membrane composition analysis\",\n      \"pmids\": [\"31432619\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether Rab35 acts inside the cilium or at the ciliary base unresolved\", \"Effector mediating Smoothened ciliary targeting not identified\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"A Rab35–MTMR13–MTMR2 complex was defined as the mechanism controlling PI 3-phosphate turnover and mTORC1 suppression in Schwann cells; Rab35 knockout in vivo caused focal hypermyelination rescued by mTORC1 inhibition, revealing a lipid-signaling axis for myelin growth control.\",\n      \"evidence\": \"Co-IP, in vivo Rab35 KO, PI phospholipid measurement, mTORC1 activity assay, pharmacological rescue\",\n      \"pmids\": [\"32503983\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether Rab35-myotubularin axis operates in other myelinating glia unclear\", \"Direct structural basis for Rab35-MTMR13 interaction unresolved\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"DENND2B was identified as a dual GEF and effector for Rab35 at the intercellular bridge, controlling ESCRT-III recruitment and the Aurora B abscission checkpoint; separately, context-specific GEF usage was defined (DENND1A for 3D polarity via ACAP2; FLCN for 2D OCRL-dependent sorting), revealing modular GEF-effector wiring.\",\n      \"evidence\": \"GEF assay, Co-IP, siRNA knockdown with cytokinesis and ESCRT-III imaging; CRISPR KO in 2D/3D MDCK cultures\",\n      \"pmids\": [\"37454296\", \"31992598\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How cells select among GEFs at the intercellular bridge not determined\", \"Whether DENND2B dual function is unique or shared with other DENN proteins unclear\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"A human homozygous R27H variant in RAB35 was shown to cause neurodevelopmental disease by trapping RAB35 in an inactive conformation (enhanced GEF binding, reduced effector engagement), with consequent Arf6 hyperactivation, cytokinesis delay, and ciliary defects—providing the first Mendelian disease link and unifying multiple RAB35 functions in a single pathogenic mechanism.\",\n      \"evidence\": \"Exome sequencing, in vitro GEF and effector binding assays, Arf6 activation measurement, cytokinesis and cilia analysis\",\n      \"pmids\": [\"38432637\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Number and spectrum of RAB35-associated disease families remain limited\", \"Whether other hypomorphic variants produce milder phenotypes unknown\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Congenital Rab35 KO is embryonic lethal (E7.5) in mice, and brain-specific KO causes hippocampal lamination defects and behavioral abnormalities, confirming essential in vivo roles; the Shigella effector IcsB was shown to non-canonically acylate Rab35 in its polybasic region to entrap it at bacterial vacuoles.\",\n      \"evidence\": \"Rab35 KO mice (congenital and brain-specific), behavioral testing, quantitative proteomics; STED microscopy and PTM analysis during Shigella infection\",\n      \"pmids\": [\"37085665\", \"38568808\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Which Rab35 effectors are critical for embryonic survival unknown\", \"Whether acylation-based hijacking occurs with other pathogens not explored\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"A comprehensive structural model of how Rab35 discriminates among its >10 effectors in a spatiotemporal manner is lacking; the phosphorylation code imposed by LRRK2 and potentially other kinases, and how it reshapes effector selectivity, remains undefined.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No co-crystal structure of Rab35 with any effector exists\", \"Complete phosphorylation site mapping and functional consequences not determined\", \"How Rab35 is partitioned between plasma membrane, endosomes, cilia, and intercellular bridge simultaneously is mechanistically unresolved\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003924\", \"supporting_discovery_ids\": [0, 8, 13, 18, 24, 34, 47]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [10, 13, 15, 22, 29, 33, 40]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 37, 42]},\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [0, 5, 21, 22]},\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [34, 47]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [3, 11, 27]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [0, 1, 5, 15, 21, 22]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [0, 8, 43, 47]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [28]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [30, 33, 36]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [2, 35, 44]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [17, 24, 49]},\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [34, 47]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"OCRL\",\n      \"ACAP2\",\n      \"FSCN1\",\n      \"DENND1A\",\n      \"DENND1B\",\n      \"DENND2B\",\n      \"TBC1D10A\",\n      \"MICAL1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}