{"gene":"RAB25","run_date":"2026-04-28T19:45:45","timeline":{"discoveries":[{"year":1993,"finding":"RAB25 was identified as a novel member of the Rab GTPase family with a deduced amino acid sequence showing 63% identity with Rab11, a carboxyl-terminal CCQNI motif, a novel GTP-binding site sequence (WDTAGLE), and the ability to bind GTP on blot. Its expression was restricted to epithelial tissues (gastrointestinal mucosa, lung, kidney), with enrichment in parietal cells.","method":"3'-RACE cloning, GTP-binding blot assay, Northern blot tissue distribution","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — original biochemical identification with GTP-binding assay and sequence characterization","pmids":["8360141"],"is_preprint":false},{"year":1999,"finding":"Rab25 colocalizes with Rab11a in subapical vesicles of polarized MDCK epithelial cells and associates with the apical recycling endosome, which is accessible to markers internalized from both apical and basolateral membranes. Overexpression of Rab25 decreased the rate of IgA transcytosis and apical (but not basolateral) recycling, while dominant-negative Rab25T26N did not alter either process.","method":"Transfection of MDCK cells, immunofluorescence colocalization with Rab11a, dimeric IgA transcytosis assay, nocodazole treatment, dominant-negative mutant expression","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal functional assays (transcytosis, recycling, dominant-negative) with defined phenotypic readouts in polarized epithelial cells","pmids":["9880326"],"is_preprint":false},{"year":2000,"finding":"Using inducible expression of wild-type, dominant-negative (Rab25S21N), and constitutively active (Rab25S21V) mutants in MDCK cells, Rab25 was shown to selectively regulate apical recycling and transcytosis but not basolateral transferrin recycling. Both wild-type and active Rab25 inhibited apical IgA recycling and transcytosis by >50%; GTPase-deficient Rab11aS20V inhibited transcytosis but not recycling, defining distinct functional roles.","method":"Inducible expression of GTPase mutants, IgA transcytosis assay, transferrin recycling assay in MDCK cells","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — rigorous mutagenesis panel with multiple orthogonal trafficking assays","pmids":["10869360"],"is_preprint":false},{"year":2004,"finding":"Forced expression of RAB25 in cancer cells markedly increased anchorage-dependent and anchorage-independent cell proliferation, prevented apoptosis and anoikis (including chemotherapy-induced), and increased in vivo tumor aggressiveness. These effects were associated with decreased expression of proapoptotic BAK and BAX and activation of the PI3K/AKT pathway.","method":"RAB25 overexpression in ovarian/breast cancer cell lines, anchorage-independent growth assay, apoptosis assay, Western blot for BAK/BAX and phospho-AKT, in vivo xenograft tumor growth","journal":"Nature medicine","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal functional assays (proliferation, apoptosis, anoikis, in vivo) with molecular pathway analysis; highly cited foundational study","pmids":["15502842"],"is_preprint":false},{"year":2007,"finding":"Rab25 directly interacts with the β1 integrin cytoplasmic tail, and this association promotes localization of integrin-recycling vesicles to pseudopodial tips and retention of a cycling pool of α5β1 at the cell front, driving invasive migration on 3D matrices. Rab25-driven tumor-cell invasion was strongly dependent on fibronectin ligation by α5β1 and the capacity of Rab25 to interact with β1 integrin.","method":"Direct interaction assay (β1 integrin cytoplasmic tail pulldown), live-cell imaging of vesicle localization, 3D matrix invasion assay, fibronectin dependence assay, interaction-deficient mutants","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 2 — direct binding demonstrated, coupled with functional rescue and 3D invasion assays; highly cited","pmids":["17925226"],"is_preprint":false},{"year":2010,"finding":"Rab25 deficiency in mice crossed onto ApcMin/+ background produced a 4-fold increase in intestinal polyps and 2-fold increase in colonic tumors, demonstrating a tumor suppressor function. Rab25-deficient mice showed decreased β1 integrin staining in lateral membranes of villus cells, indicating Rab25 regulates β1 integrin trafficking to the cell surface in intestinal epithelium.","method":"Rab25 knockout mouse model, ApcMin/+ genetic cross, Smad3+/- genetic cross, immunostaining for β1 integrin, polyp/tumor counting","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 — genetic epistasis in mouse models with multiple crosses and defined cellular phenotype","pmids":["20197623"],"is_preprint":false},{"year":2011,"finding":"Rab25 directs active-conformation α5β1 integrin to late endosomes/lysosomes where, together with CLIC3, integrins are retrogradely transported and recycled to the plasma membrane at the back of invading cells rather than being degraded. CLIC3 is upregulated in Rab25-expressing cells, colocalizes with active α5β1 in late endosomes/lysosomes, and is required for release of the cell rear during migration and for maintenance of active Src signaling.","method":"Photoactivation of fluorescent proteins, biochemical fractionation, CLIC3 knockdown, 3D matrix invasion assay, active-conformation integrin antibody localization, Src signaling assay","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (photoactivation, biochemistry, functional assays) with clear mechanistic pathway placement","pmids":["22197222"],"is_preprint":false},{"year":2011,"finding":"Overexpression of Rab25 in non-transformed rat intestinal epithelial (RIE) cells leads to morphological transformation, anchorage-independent growth, tumor formation in nude mice, disruption of integrin-based focal adhesions, and alteration of microtubule subsets. Transformation by Rab25 (but not H-RasV12) was reversed by inhibitors of microtubule polymerization, identifying microtubule-dependent trafficking as the mechanism.","method":"Rab25 overexpression in RIE cells, soft-agar colony assay, nude mouse xenograft, focal adhesion immunostaining, microtubule inhibitor treatment, comparison with H-RasV12 transformation","journal":"Cytoskeleton (Hoboken, N.J.)","confidence":"High","confidence_rationale":"Tier 2 — loss-of-function pharmacological rescue identifies microtubule dependence as mechanistically distinct from Ras-driven transformation","pmids":["21246754"],"is_preprint":false},{"year":2012,"finding":"RAB25 enhances survival during nutrient stress by directly binding and activating AKT, leading to increased glucose uptake, elevated cellular ATP levels, and glycogen accumulation in epithelial cancer cells—a function not previously attributed to Rab25.","method":"RAB25 overexpression/knockdown in cancer cells, AKT binding assay, glucose uptake assay, ATP measurement, glycogen staining, nutrient deprivation survival assay","journal":"EMBO molecular medicine","confidence":"High","confidence_rationale":"Tier 2 — AKT binding demonstrated with multiple metabolic readouts across conditions","pmids":["22253197"],"is_preprint":false},{"year":2012,"finding":"Grhl2 transcriptionally upregulates Rab25, which in turn increases Claudin-4 protein levels and enhances its localization to tight junctions in liver progenitor epithelial cells, coordinating epithelial lumen formation in 3D culture.","method":"Grhl2 cDNA transfection, 3D cyst culture, Claudin-4 localization by immunofluorescence, Rab25 overexpression, functional tight junction assay","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 — defined pathway position (Grhl2→Rab25→Claudin-4 at TJ) with 3D functional assay, single lab","pmids":["22696678"],"is_preprint":false},{"year":2013,"finding":"Crystal structure of Rab25 in complex with the C-terminal FIP2 coiled-coil domain revealed a heterotetrameric Rab25-(FIP2)2-Rab25 complex. Thermodynamic analysis showed FIP2 binds Rab25 with ~3-fold weaker affinity than Rab11a, attributable to subtle conformational differences in switch 1 and switch 2 regions. Rab25 can recruit FIP2 to endosomal membranes in cells.","method":"Crystal structure determination, isothermal titration calorimetry (ITC), cellular co-localization of Rab25 with FIP2 on endosomal membranes","journal":"Biochimica et biophysica acta","confidence":"High","confidence_rationale":"Tier 1 — crystal structure with thermodynamic characterization and cellular validation","pmids":["24056041"],"is_preprint":false},{"year":2013,"finding":"Rab25 knockdown in polarized Caco2-BBE intestinal epithelial cells decreased α2-, α5-, and β1-integrin expression, with direct colocalization and co-immunoprecipitation demonstrating Rab25 directly associates with α5β1 integrins. Rab25 loss also upregulated claudin-1, increased transepithelial resistance, increased invasive behavior, and disorganized brush border microvilli. These phenotypes were rescued by reintroduction of Rab25. Rab25 regulated α5-integrin at the transcriptional level via the transcription factor ETV4.","method":"shRNA knockdown and rescue, Co-IP of Rab25 with α5β1 integrin, transepithelial resistance measurement, invasion assay, transcriptomics, ETV4 overexpression rescue","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP combined with shRNA knockdown/rescue and multiple orthogonal phenotypic readouts","pmids":["23345591"],"is_preprint":false},{"year":2013,"finding":"Rab25 regulates invasion and actin organization in head and neck squamous cell carcinoma (HNSCC): reexpression of Rab25 in a metastatic HNSCC cell line blocked invasion in 3D collagen matrix and metastasis to cervical lymph nodes in a mouse oral cancer model. Rab25 specifically affected F-actin organization at the cell surface rather than cell proliferation, apoptosis, or angiogenesis.","method":"Intravital microscopy in live animals, 3D collagen matrix invasion assay, in vivo lymph node metastasis model, F-actin staining","journal":"Clinical cancer research","confidence":"High","confidence_rationale":"Tier 2 — in vivo metastasis model combined with intravital microscopy and specific mechanistic readout (F-actin organization)","pmids":["23340300"],"is_preprint":false},{"year":2013,"finding":"Rab25 regulates secretion of osteoprotegerin (OPG) at both the transcriptional and secretion level; RAB25 expression increased OPG mRNA and protein secretion from ovarian and breast cancer cells, protecting them from TRAIL-induced cell death. This effect cooperated with EGFR-mediated MAPK signaling.","method":"RAB25 overexpression/siRNA knockdown, OPG ELISA in conditioned media, TRAIL cytotoxicity assay, EGFR inhibitor combination, pharmacogenetic pathway analysis","journal":"Journal of genetic syndromes & gene therapy","confidence":"Medium","confidence_rationale":"Tier 2 — functional link between Rab25, OPG secretion, and TRAIL resistance demonstrated, but single lab","pmids":["25520884"],"is_preprint":false},{"year":2016,"finding":"Rab25 regulates HIF-1α protein expression in an oxygen-independent manner via the ErbB2/ERK1/2 and p70S6K/mTOR pathways, requiring de novo protein synthesis rather than transcriptional upregulation. Rab25 expression induces HIF-1 transcriptional activity, increases cisplatin resistance, and confers intraperitoneal growth capacity in ovarian cancer cells.","method":"RAB25 overexpression in A2780 and SKOV3 cells, HIF-1α protein/mRNA analysis, signaling inhibitor panel (ErbB2, ERK1/2, mTOR inhibitors), HIF-1β siRNA knockdown, in vivo peritoneal carcinomatosis model","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 — pathway identified by inhibitor panel and genetic knockdown with in vivo validation, single lab","pmids":["26967059"],"is_preprint":false},{"year":2016,"finding":"In hepatic stellate cells (HSCs), ROS-dependent Rab25 overexpression promotes the interaction of Rab25 with PI3KCIII (VPS34), directing autophagy to recognize and degrade lipid droplets during HSC activation. Rab25 siRNA blocked autophagic targeting of lipid droplets; antioxidant scavenging of ROS disrupted the Rab25-autophagy interaction.","method":"Rab25 siRNA, autophagy inhibition (Atg5 siRNA), ROS scavengers (GSH, NAC), Co-IP of Rab25 with PI3KCIII, lipid droplet staining, autophagic flux assay","journal":"Redox biology","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP identifies PI3KCIII as Rab25 binding partner with functional consequence, but single lab","pmids":["28038427"],"is_preprint":false},{"year":2016,"finding":"Rab25 expression in arterial smooth muscle cells (myocytes) promotes surface expression of CaV1.2 calcium channels by preventing their lysosomal and proteasomal degradation. Rab25 co-localizes in close spatial proximity to CaV1.2 channels (immunoFRET). Rab25 knockdown reduced CaV1.2 surface and intracellular abundance, reduced whole-cell CaV1.2 current density, and inhibited pressure- and depolarization-induced vasoconstriction in cerebral arteries.","method":"siRNA knockdown in cerebral artery myocytes, surface biotinylation assay, immunoFRET microscopy, whole-cell patch-clamp electrophysiology, myogenic tone measurement","journal":"American journal of physiology. Cell physiology","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (FRET, biotinylation, electrophysiology, vascular function) with clean KD phenotype","pmids":["27076616"],"is_preprint":false},{"year":2017,"finding":"Stapled peptides (RFP14) derived from the RAB-binding FIP-family inhibit RAB25:FIP complex formation, exhibit increased structural stability, binding affinity, and cell permeability. RFP14 inhibits migration and proliferation in RAB25 pro-oncogenic cell lines and augments these phenotypes in tumor-suppressive RAB25 contexts, validating the RAB25:FIP interaction as mechanistically important for context-specific oncogenic functions.","method":"All-hydrocarbon stapled peptide synthesis, binding affinity measurement, cell permeability assay, RAB25:FIP co-IP disruption assay, migration/proliferation assay in RAB25-expressing vs. RAB25-low cell lines, transcriptional profiling","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 — chemical biology with in vitro binding, cellular target engagement, and functional validation across multiple contexts","pmids":["28939823"],"is_preprint":false},{"year":2017,"finding":"RIN1 interacts with Rab25 as a functional binding partner in renal cell carcinoma. Rab25 knockdown eliminated the augmentation of cell proliferation, migration, and invasion conferred by ectopic RIN1 expression, placing Rab25 downstream of RIN1 in activation of EGFR signaling in ccRCC.","method":"Co-IP of RIN1 with Rab25, gain/loss-of-function experiments, epistasis (Rab25 knockdown rescues RIN1 overexpression phenotype), EGFR signaling assay","journal":"Cancer science","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP plus epistasis experiment placing Rab25 downstream of RIN1, single lab","pmids":["28612496"],"is_preprint":false},{"year":2018,"finding":"Rab25 increases β1 integrin levels at the plasma membrane, leading to sequential activation of EGFR and upregulation of VEGF-A expression, increased Snail and fascin expression, and epithelial-to-mesenchymal transition and cancer cell invasiveness. Snail was identified as the mediator of Rab25-induced fascin expression.","method":"Rab25 overexpression, β1 integrin surface expression assay, EGFR phosphorylation, VEGF-A ELISA, Snail/fascin Western blot, 3D invasion assay, in vivo lung metastasis model","journal":"Experimental & molecular medicine","confidence":"Medium","confidence_rationale":"Tier 2 — ordered signaling pathway established with multiple readouts, single lab","pmids":["29371698"],"is_preprint":false},{"year":2018,"finding":"ZEB2 binds to E-box sequences on the RAB25 promoter and stably represses RAB25 expression through epigenetic mechanisms requiring DNA methyltransferases (DNMTs) for local DNA hypermethylation and SIRT1 for H3K9 deacetylation. SIRT1 inhibition decreased long-term repression stability but did not prevent ZEB2-mediated RAB25 downregulation directly. RAB25 partially suppresses ZEB2-mediated cell migration.","method":"Conditional ZEB2 expression system, ChIP for ZEB2 binding to RAB25 promoter E-boxes, bisulfite sequencing for DNA methylation, H3K9ac ChIP, SIRT1 inhibitor treatment, cell migration assay","journal":"Epigenetics & chromatin","confidence":"High","confidence_rationale":"Tier 1 — ChIP, bisulfite sequencing, and inhibitor studies directly establish the epigenetic mechanism of ZEB2-mediated RAB25 repression","pmids":["30445998"],"is_preprint":false},{"year":2019,"finding":"Rab25 interacts with β1 integrin and promotes its trafficking to the cytoplasmic membrane, leading to membrane β1 integrin-induced AKT phosphorylation and subsequent activation of the Wnt/β-catenin signaling pathway to promote cell proliferation and erlotinib resistance in NSCLC cells.","method":"Co-immunoprecipitation of Rab25 with β1 integrin, cell fractionation to assess membrane β1 integrin levels, AKT/β-catenin Western blot, lentiviral knockin/knockout, cell proliferation and drug resistance assays in vitro and in vivo","journal":"Cell proliferation","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP plus pathway activation assay, single lab","pmids":["30848009"],"is_preprint":false},{"year":2019,"finding":"Loss of Rab25 in skin keratinocytes causes dysregulation of integrin β1, β4, and α6 trafficking, impairs their recycling, and promotes squamous cell carcinoma development. In a two-stage mouse skin carcinogenesis model, Rab25 knockout significantly accelerated tumor generation and malignant transformation.","method":"Rab25 knockout mice, two-stage skin carcinogenesis (DMBA/TPA) model, HaCaT xenograft, integrin expression/localization immunostaining, integrin recycling assay","journal":"The Journal of pathology","confidence":"High","confidence_rationale":"Tier 2 — in vivo genetic model with integrin trafficking mechanistic readout and xenograft validation","pmids":["31144312"],"is_preprint":false},{"year":2020,"finding":"RAB25 interacts with EGFR and enhances EGFR recycling to the cell surface while decreasing its degradation in the cytoplasm, leading to hyperactive EGFR signaling and acquired radioresistance in lung and nasopharyngeal cancer cells.","method":"Co-IP of Rab25 with EGFR, EGFR surface expression assay, EGFR degradation kinetics, RAB25 knockdown with radiosensitivity assay in vitro and in vivo","journal":"iScience","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP and receptor recycling/degradation assay with functional consequence, single lab","pmids":["32252020"],"is_preprint":false},{"year":2021,"finding":"In zebrafish gastrula epithelium, Rab25 localizes near cytokinetic midbodies and coordinates abscission through endomembrane trafficking. Loss of maternal-zygotic Rab25a and Rab25b results in persistent apical cytokinetic bridges that fail timely abscission, causing anisotropic cell morphologies, reduced contractile actomyosin networks, slowed cell rearrangements, altered tissue viscoelastic responses, and delayed epiboly.","method":"Maternal-zygotic Rab25a/Rab25b double mutant zebrafish, live imaging of cytokinetic bridges, actomyosin network quantification, tissue mechanical measurements","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 — genetic loss-of-function in zebrafish (ortholog) with defined cellular and tissue-level mechanistic readouts across multiple methods","pmids":["33755014"],"is_preprint":false},{"year":2021,"finding":"Rab25 co-locates on the cell membrane with PKM2 in gastric adenocarcinoma cells and can directly bind to PKM2 as shown by co-immunoprecipitation. Rab25 acts as a positive regulator of PKM2, promoting PKM2 phosphorylation (Y105) and thereby participating in the regulation of aerobic glycolysis.","method":"Co-immunoprecipitation of Rab25 with PKM2, immunofluorescence co-localization, lactate/pyruvate measurement, lentiviral overexpression/silencing","journal":"Translational cancer research","confidence":"Medium","confidence_rationale":"Tier 3 — Co-IP identifies PKM2 as binding partner with functional glycolysis readout, single lab","pmids":["35116410"],"is_preprint":false},{"year":2022,"finding":"RAB25 coordinates keratohyalin granule (KHG) maturation and filaggrin processing in epidermis by regulating actin dynamics. In HaCaT keratinocytes, RAB25 co-expresses with filaggrin-containing KHGs, and RAB25 silencing impairs KHG formation through abnormal actin dynamics. RAB25 knockout mice show disrupted stratum corneum, skin barrier dysfunction, and decreased KHG production.","method":"RAB25 knockout mice, RAB25 siRNA in HaCaT cells, KHG immunofluorescence, actin dynamics assay, trans-epidermal water loss measurement, comparison with human AD skin specimens","journal":"Allergy","confidence":"Medium","confidence_rationale":"Tier 2 — genetic knockout with cellular silencing and actin mechanism identified, single lab","pmids":["36383036"],"is_preprint":false},{"year":2025,"finding":"RAB25 promotes ADAMTS5 expression in ovarian cancer cells through activation of the NF-κB signaling pathway. ADAMTS5 is necessary and sufficient to stimulate ovarian cancer cell migration through fibroblast-secreted matrices, identifying it as a downstream effector of Rab25-driven invasion.","method":"RAB25 overexpression/knockdown with ADAMTS5 expression readout, NF-κB pathway inhibition, ADAMTS5 knockdown/overexpression, 3D spheroid invasion assay, selective ADAMTS5 inhibitor treatment","journal":"The FEBS journal","confidence":"Medium","confidence_rationale":"Tier 2 — epistasis experiment placing ADAMTS5 downstream of RAB25/NF-κB with 3D functional assay, single lab","pmids":["40164572"],"is_preprint":false},{"year":2025,"finding":"RAB25 loss in gastric epithelial cells facilitates TGF-α secretion, which promotes upregulation of EGFR signaling in pit cells. In Rab25 KO mice, long-term altered TGFA secretion caused foveolar hyperplasia ameliorated by TGFA neutralization, establishing a physiological role for Rab25 in regulating gastric pit lineage commitment through control of TGFA secretory trafficking.","method":"Rab25 KO mice, mouse primary gastric cell culture, TGFA secretion assay, EGFR signaling measurement, TGFA-neutralizing antibody treatment, single-cell RNA sequencing analysis","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 — genetic KO with rescue by TGFA neutralization and defined signaling mechanism, single lab","pmids":["41365858"],"is_preprint":false},{"year":2025,"finding":"RAB25 interacts with GCN1, inhibits K33-ubiquitination-mediated degradation of GCN1, and thereby promotes GCN2 phosphorylation and ATF4-mediated ER stress, contributing to alcohol-associated liver disease progression. RAB25 specifically accumulated on the ER in ALD.","method":"Mass spectrometry identification of RAB25-GCN1 interaction, Co-IP assay, ubiquitination assay, GCN2/ATF4 phosphorylation Western blot, RAB25 knockdown in hepatocytes, in vivo ALD mouse model","journal":"Clinical and molecular hepatology","confidence":"Medium","confidence_rationale":"Tier 2 — MS plus Co-IP identifies GCN1 as RAB25 binding partner, ubiquitination mechanism defined, functional in vivo validation","pmids":["40916695"],"is_preprint":false},{"year":2010,"finding":"The core promoter of human RAB25 contains a CRE element (-67/-58) that binds CREB, as demonstrated by EMSA and ChIP. PKA activation (forskolin) enhances chromatin accessibility at the RAB25 promoter, promotes CREB phosphorylation, recruits co-factors CBP and BRG1, and increases RAB25 expression. Deletion of the CRE abolished promoter activity.","method":"5'-deletion luciferase reporter assay, EMSA, ChIP for CREB binding, chromatin accessibility assay (PCR-based), forskolin (PKA activator) treatment","journal":"The international journal of biochemistry & cell biology","confidence":"Medium","confidence_rationale":"Tier 1 — in vitro and cellular biochemical assays for promoter mechanism, single lab","pmids":["21075212"],"is_preprint":false},{"year":2024,"finding":"An APEX2 proximity labeling screen identified DENND6A as a physical interacting partner of RAB25, and this interaction affects cell migration.","method":"APEX2 proximity labeling mass spectrometry, interaction validation, cell migration assay","journal":"bioRxiv","confidence":"Low","confidence_rationale":"Tier 3 — proximity labeling with functional follow-up, preprint, single lab","pmids":[],"is_preprint":true},{"year":2024,"finding":"Magnetogenetic repositioning of endogenous Rab25 vesicles to the cell periphery directly drives formation of F-actin protrusions. Rab25 vesicles coordinate localization of the actin regulator FMNL1 and integrin β1 with activation of Rho GTPases at the plasma membrane to generate filopodial protrusions and promote cancer cell invasive migration in 3D matrix.","method":"Magnetogenetic manipulation of Rab25 vesicle positioning, live-cell F-actin imaging, FMNL1 and β1 integrin co-localization, Rho GTPase activation biosensor, 3D matrix invasion assay","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 1 — direct causal manipulation of Rab25 vesicle position with real-time F-actin readout; preprint but orthogonal mechanistic approach","pmids":[],"is_preprint":true}],"current_model":"RAB25 is an epithelial-specific Rab11-subfamily small GTPase that cycles between GDP/GTP states to regulate apical recycling endosome function: it directly binds the β1 integrin cytoplasmic tail and FIP-family effectors (FIP2) to route α5β1 integrin and other cargoes (EGFR, CaV1.2, TGF-α) through late endosomes/lysosomes (in concert with CLIC3) or back to specific plasma membrane domains, thereby controlling cell polarity, invasive migration, cytokinetic abscission, and bioenergetics (via AKT activation and glycogen storage), with its context-dependent oncogenic or tumor-suppressive output determined by cell lineage, co-expression of effectors such as RCP, and epigenetic silencing by ZEB2/SIRT1/DNMTs."},"narrative":{"teleology":[{"year":1993,"claim":"Identification of RAB25 as a novel epithelial-restricted Rab GTPase with a unique GTP-binding motif (WDTAGLE) established it as a distinct Rab11-subfamily member requiring functional characterization.","evidence":"3'-RACE cloning, GTP-binding blot assay, and Northern blot tissue distribution from rabbit parietal cells","pmids":["8360141"],"confidence":"High","gaps":["No effector partners identified","No functional assay beyond GTP binding","Mammalian subcellular localization not determined"]},{"year":1999,"claim":"Demonstration that Rab25 co-localizes with Rab11a at the apical recycling endosome and selectively regulates apical transcytosis and recycling (but not basolateral trafficking) in polarized epithelial cells placed it as a pathway-specific regulator of polarized membrane traffic.","evidence":"Transfection and dominant-negative expression in polarized MDCK cells with IgA transcytosis and recycling assays","pmids":["9880326","10869360"],"confidence":"High","gaps":["Cargo identity beyond IgA not defined","Effector mechanism unknown","In vivo relevance not tested"]},{"year":2004,"claim":"The finding that RAB25 overexpression promoted cancer cell proliferation, anoikis resistance, and in vivo tumor aggressiveness via AKT activation revealed an unexpected oncogenic function for a trafficking GTPase.","evidence":"RAB25 overexpression in ovarian/breast cancer cells with proliferation, apoptosis, anoikis, and xenograft assays","pmids":["15502842"],"confidence":"High","gaps":["Direct AKT binding not yet demonstrated","Mechanism connecting trafficking to AKT unclear","Context dependence not appreciated"]},{"year":2007,"claim":"Identification of β1 integrin as a direct cargo of Rab25 explained how vesicle trafficking controls invasive migration: Rab25 binds the β1 integrin cytoplasmic tail and delivers α5β1-containing vesicles to pseudopodial tips during 3D invasion.","evidence":"Direct pulldown with β1 integrin cytoplasmic tail, live-cell vesicle imaging, and 3D matrix invasion assays","pmids":["17925226"],"confidence":"High","gaps":["Route through endosomal compartments not mapped","Role of FIP effectors in integrin delivery not tested","Whether other integrins are direct cargoes unknown"]},{"year":2010,"claim":"Genetic loss of Rab25 in mice accelerated intestinal tumorigenesis on ApcMin/+ background, establishing that Rab25 functions as a tumor suppressor in intestinal epithelium — the first evidence of its context-dependent dual role in cancer.","evidence":"Rab25 knockout mouse crossed to ApcMin/+ and Smad3+/- backgrounds with tumor quantification and β1 integrin localization","pmids":["20197623"],"confidence":"High","gaps":["Molecular basis of tumor suppression vs. oncogenic activity not resolved","Cell-autonomous vs. non-autonomous effects not distinguished"]},{"year":2011,"claim":"The discovery that Rab25 routes active-conformation α5β1 integrin through late endosomes/lysosomes for CLIC3-dependent retrograde recycling (rather than degradation) defined a non-canonical recycling pathway that controls rear-end retraction during cell invasion.","evidence":"Photoactivation of fluorescent proteins, biochemical fractionation, CLIC3 knockdown, and 3D invasion assays","pmids":["22197222"],"confidence":"High","gaps":["How Rab25 prevents lysosomal degradation of integrins mechanistically unclear","CLIC3 recruitment mechanism not defined"]},{"year":2012,"claim":"Demonstration that RAB25 directly binds and activates AKT to increase glucose uptake, ATP, and glycogen storage connected Rab25 trafficking to metabolic reprogramming and survival under nutrient stress.","evidence":"AKT binding assay, glucose uptake, ATP measurement, glycogen staining in cancer cells under nutrient deprivation","pmids":["22253197"],"confidence":"High","gaps":["Structural basis of RAB25–AKT interaction unknown","Whether AKT binding requires GTP-loaded state not tested"]},{"year":2013,"claim":"The crystal structure of Rab25 in complex with FIP2 revealed a heterotetrameric architecture and subtle switch-region differences explaining the ~3-fold weaker affinity compared to Rab11a, providing the first structural basis for effector selectivity within the Rab11 subfamily.","evidence":"X-ray crystallography, isothermal titration calorimetry, and cellular co-localization of Rab25–FIP2 on endosomal membranes","pmids":["24056041"],"confidence":"High","gaps":["Structures with other FIP family members not available","How differential FIP affinity translates to cargo selectivity in cells unknown"]},{"year":2013,"claim":"Multiple studies converged on Rab25's role in controlling integrin expression, tight junction composition, and F-actin organization: Rab25 knockdown decreased α5β1 integrin levels partly via ETV4-dependent transcription, while Rab25 re-expression in HNSCC blocked invasion and metastasis by reorganizing cortical F-actin.","evidence":"shRNA knockdown/rescue with Co-IP in Caco2-BBE cells; intravital imaging and 3D invasion in HNSCC mouse model","pmids":["23345591","23340300"],"confidence":"High","gaps":["Whether ETV4 regulation is direct or indirect not fully resolved","Actin-regulatory mechanism downstream of Rab25 not identified"]},{"year":2016,"claim":"Rab25 was found to regulate CaV1.2 calcium channel surface expression in arterial smooth muscle by preventing lysosomal/proteasomal degradation, expanding its trafficking function beyond epithelial cells to vascular physiology.","evidence":"siRNA knockdown in cerebral artery myocytes with surface biotinylation, immunoFRET, patch-clamp electrophysiology, and myogenic tone measurement","pmids":["27076616"],"confidence":"High","gaps":["Whether Rab25 directly binds CaV1.2 not demonstrated","Mechanism distinguishing lysosomal vs. proteasomal protection unclear"]},{"year":2017,"claim":"Stapled peptides disrupting the RAB25:FIP interaction validated this complex as the functional unit driving context-dependent oncogenic or tumor-suppressive outputs, providing the first pharmacological tool to dissect Rab25 effector engagement.","evidence":"Stapled peptide (RFP14) synthesis with binding assays, Co-IP disruption, and migration/proliferation assays across multiple cell contexts","pmids":["28939823"],"confidence":"High","gaps":["In vivo pharmacokinetics not established","Which specific FIP family member mediates each cellular context not resolved"]},{"year":2018,"claim":"Identification of ZEB2 as a direct transcriptional repressor of RAB25 via E-box binding, DNMT-mediated promoter methylation, and SIRT1-dependent H3K9 deacetylation established the epigenetic mechanism by which EMT programs silence RAB25.","evidence":"ChIP for ZEB2 at RAB25 promoter E-boxes, bisulfite sequencing, H3K9ac ChIP, SIRT1 inhibitor treatment in conditional ZEB2 system","pmids":["30445998"],"confidence":"High","gaps":["Whether other EMT transcription factors (Snail, Twist) similarly regulate RAB25 not tested","Reversibility of epigenetic silencing in tumors not explored"]},{"year":2019,"claim":"Rab25 loss in skin keratinocytes accelerated chemical carcinogenesis by dysregulating recycling of integrins β1, β4, and α6, extending the tumor-suppressor role to stratified squamous epithelium and broadening the cargo repertoire.","evidence":"Rab25 knockout mice in two-stage skin carcinogenesis model with integrin localization and recycling assays","pmids":["31144312"],"confidence":"High","gaps":["Whether integrin α6β4 is a direct Rab25 cargo not demonstrated","Interaction with hemidesmosome assembly not explored"]},{"year":2021,"claim":"Zebrafish maternal-zygotic Rab25a/b mutants revealed a conserved role in cytokinetic abscission: Rab25 delivers endomembrane to midbodies, and its loss causes persistent apical bridges, altered actomyosin networks, and delayed epiboly, linking Rab25 trafficking to tissue mechanics.","evidence":"Maternal-zygotic double mutant zebrafish with live imaging of cytokinetic bridges, actomyosin quantification, and tissue mechanical measurements","pmids":["33755014"],"confidence":"High","gaps":["Specific abscission cargo delivered by Rab25 not identified","Whether this role is conserved in mammalian cytokinesis unknown"]},{"year":2022,"claim":"RAB25 was shown to coordinate keratohyalin granule maturation and filaggrin processing in epidermis through regulation of actin dynamics, linking its trafficking function to skin barrier integrity.","evidence":"RAB25 knockout mice and siRNA in HaCaT cells with KHG immunofluorescence, actin dynamics assay, and trans-epidermal water loss measurement","pmids":["36383036"],"confidence":"Medium","gaps":["Mechanism by which Rab25 regulates actin at KHGs not defined","Whether FIP effectors are involved in this process untested"]},{"year":2025,"claim":"RAB25 loss in gastric epithelium deregulates TGF-α secretory trafficking, driving EGFR-dependent foveolar hyperplasia that is rescued by TGF-α neutralization, establishing a physiological role in gastric pit cell lineage commitment.","evidence":"Rab25 KO mice, primary gastric cell culture, TGFA secretion assay, TGFA-neutralizing antibody rescue, scRNA-seq","pmids":["41365858"],"confidence":"Medium","gaps":["Whether TGF-α is a direct Rab25 vesicle cargo not shown","Long-term cancer risk from chronic TGF-α deregulation not assessed"]},{"year":2025,"claim":"Discovery that RAB25 stabilizes GCN1 by inhibiting K33-ubiquitination, promoting GCN2–ATF4 ER stress signaling in alcohol-associated liver disease, revealed a non-canonical role in protein quality control beyond classical vesicle trafficking.","evidence":"Mass spectrometry, Co-IP, ubiquitination assay, GCN2/ATF4 phosphorylation analysis, in vivo ALD mouse model","pmids":["40916695"],"confidence":"Medium","gaps":["Whether Rab25 GTPase activity is required for GCN1 stabilization unknown","Generalizability beyond ALD not tested","Single study without independent replication"]},{"year":null,"claim":"The molecular basis of RAB25's context-dependent switch between oncogenic and tumor-suppressive functions remains incompletely defined: it is unclear which specific FIP effector combinations, integrin cargo repertoires, and epigenetic states determine the outcome in each tissue lineage.","evidence":"","pmids":[],"confidence":"Low","gaps":["No systematic mapping of Rab25 effector complexes across tissue contexts","Structural basis of β1 integrin tail recognition by Rab25 unresolved","Role of GTP/GDP cycling kinetics in cargo selection not characterized"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003924","term_label":"GTPase activity","supporting_discovery_ids":[0,2]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[8,16,17]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[4,10,11]}],"localization":[{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[1,6,10]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[1,4,24]},{"term_id":"GO:0005764","term_label":"lysosome","supporting_discovery_ids":[6]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[16,25]},{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[29]}],"pathway":[{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[1,2,4,6,16,22,23]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[3,8,19,21]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[24]},{"term_id":"R-HSA-1500931","term_label":"Cell-Cell communication","supporting_discovery_ids":[9,11]},{"term_id":"R-HSA-1474244","term_label":"Extracellular matrix organization","supporting_discovery_ids":[4,11,19]},{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[8,25]},{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[20]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[3,13]}],"complexes":["Rab25-(FIP2)2-Rab25 heterotetramer"],"partners":["ITGB1","RAB11FIP2","CLIC3","AKT1","EGFR","GCN1","RIN1","PKM"],"other_free_text":[]},"mechanistic_narrative":"RAB25 is an epithelial-enriched Rab11-family small GTPase that governs vesicular trafficking through the apical recycling endosome and late endosome/lysosome compartments, thereby controlling integrin and receptor recycling, cell polarity, cytokinetic abscission, and metabolic adaptation. RAB25 directly binds the β1 integrin cytoplasmic tail and FIP-family effectors (forming a heterotetrameric Rab25-(FIP2)₂-Rab25 complex) to route α5β1 integrin, EGFR, CaV1.2, and TGF-α to specific plasma membrane domains, with CLIC3 cooperating in retrograde transport from late endosomes [PMID:17925226, PMID:24056041, PMID:22197222, PMID:27076616, PMID:41365858]. RAB25 activates AKT to promote glucose uptake, glycogen storage, and survival under nutrient stress, and its context-dependent oncogenic versus tumor-suppressive activity is determined by cell lineage, co-expressed effectors such as RCP/FIPs, and epigenetic silencing by ZEB2 acting through DNMTs and SIRT1-mediated H3K9 deacetylation [PMID:22253197, PMID:28939823, PMID:30445998, PMID:20197623]. In vivo, Rab25 loss accelerates intestinal and skin tumorigenesis through dysregulated integrin trafficking, impairs cytokinetic abscission in zebrafish gastrula epithelium, disrupts epidermal barrier function by impairing keratohyalin granule maturation, and deregulates gastric pit cell fate through aberrant TGF-α secretion [PMID:20197623, PMID:31144312, PMID:33755014, PMID:36383036, PMID:41365858]."},"prefetch_data":{"uniprot":{"accession":"P57735","full_name":"Ras-related protein Rab-25","aliases":["CATX-8"],"length_aa":213,"mass_kda":23.5,"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 set of downstream effectors directly responsible for vesicle formation, movement, tethering and fusion (By similarity). RAB25 regulates epithelial cell differentiation, proliferation and survival, thereby playing key roles in tumorigenesis (PubMed:17925226). Promotes invasive migration of cells in which it functions to localize and maintain integrin alpha-V/beta-1 at the tips of extending pseudopodia (PubMed:17925226). Involved in the regulation of epithelial morphogenesis through the control of CLDN4 expression and localization at tight junctions (By similarity). May selectively regulate the apical recycling pathway (By similarity). Together with MYO5B regulates transcytosis (By similarity)","subcellular_location":"Cell membrane; Cytoplasmic vesicle; Cell projection, pseudopodium membrane","url":"https://www.uniprot.org/uniprotkb/P57735/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/RAB25","classification":"Not Classified","n_dependent_lines":4,"n_total_lines":1208,"dependency_fraction":0.0033112582781456954},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/RAB25","total_profiled":1310},"omim":[{"mim_id":"618001","title":"RAB11 EFFECTOR CONTAINING LIS1 HOMOLOGY DOMAIN, COILED-COIL DOMAINS, AND HEAT REPEATS; RELCH","url":"https://www.omim.org/entry/618001"},{"mim_id":"612942","title":"RAS-ASSOCIATED PROTEIN RAB25; RAB25","url":"https://www.omim.org/entry/612942"},{"mim_id":"608738","title":"RAB11 FAMILY-INTERACTING PROTEIN 3; RAB11FIP3","url":"https://www.omim.org/entry/608738"},{"mim_id":"608599","title":"RAB11 FAMILY-INTERACTING PROTEIN 2; RAB11FIP2","url":"https://www.omim.org/entry/608599"},{"mim_id":"605570","title":"RAS-ASSOCIATED PROTEIN RAB11A; RAB11A","url":"https://www.omim.org/entry/605570"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Plasma membrane","reliability":"Supported"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"esophagus","ntpm":407.1},{"tissue":"skin 1","ntpm":203.2}],"url":"https://www.proteinatlas.org/search/RAB25"},"hgnc":{"alias_symbol":["CATX-8"],"prev_symbol":[]},"alphafold":{"accession":"P57735","domains":[{"cath_id":"3.40.50.300","chopping":"10-176","consensus_level":"high","plddt":94.8453,"start":10,"end":176}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P57735","model_url":"https://alphafold.ebi.ac.uk/files/AF-P57735-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P57735-F1-predicted_aligned_error_v6.png","plddt_mean":86.62},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=RAB25","jax_strain_url":"https://www.jax.org/strain/search?query=RAB25"},"sequence":{"accession":"P57735","fasta_url":"https://rest.uniprot.org/uniprotkb/P57735.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P57735/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P57735"}},"corpus_meta":[{"pmid":"15502842","id":"PMC_15502842","title":"The RAB25 small GTPase determines 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Its expression was restricted to epithelial tissues (gastrointestinal mucosa, lung, kidney), with enrichment in parietal cells.\",\n      \"method\": \"3'-RACE cloning, GTP-binding blot assay, Northern blot tissue distribution\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — original biochemical identification with GTP-binding assay and sequence characterization\",\n      \"pmids\": [\"8360141\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Rab25 colocalizes with Rab11a in subapical vesicles of polarized MDCK epithelial cells and associates with the apical recycling endosome, which is accessible to markers internalized from both apical and basolateral membranes. Overexpression of Rab25 decreased the rate of IgA transcytosis and apical (but not basolateral) recycling, while dominant-negative Rab25T26N did not alter either process.\",\n      \"method\": \"Transfection of MDCK cells, immunofluorescence colocalization with Rab11a, dimeric IgA transcytosis assay, nocodazole treatment, dominant-negative mutant expression\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal functional assays (transcytosis, recycling, dominant-negative) with defined phenotypic readouts in polarized epithelial cells\",\n      \"pmids\": [\"9880326\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Using inducible expression of wild-type, dominant-negative (Rab25S21N), and constitutively active (Rab25S21V) mutants in MDCK cells, Rab25 was shown to selectively regulate apical recycling and transcytosis but not basolateral transferrin recycling. Both wild-type and active Rab25 inhibited apical IgA recycling and transcytosis by >50%; GTPase-deficient Rab11aS20V inhibited transcytosis but not recycling, defining distinct functional roles.\",\n      \"method\": \"Inducible expression of GTPase mutants, IgA transcytosis assay, transferrin recycling assay in MDCK cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — rigorous mutagenesis panel with multiple orthogonal trafficking assays\",\n      \"pmids\": [\"10869360\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Forced expression of RAB25 in cancer cells markedly increased anchorage-dependent and anchorage-independent cell proliferation, prevented apoptosis and anoikis (including chemotherapy-induced), and increased in vivo tumor aggressiveness. These effects were associated with decreased expression of proapoptotic BAK and BAX and activation of the PI3K/AKT pathway.\",\n      \"method\": \"RAB25 overexpression in ovarian/breast cancer cell lines, anchorage-independent growth assay, apoptosis assay, Western blot for BAK/BAX and phospho-AKT, in vivo xenograft tumor growth\",\n      \"journal\": \"Nature medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal functional assays (proliferation, apoptosis, anoikis, in vivo) with molecular pathway analysis; highly cited foundational study\",\n      \"pmids\": [\"15502842\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Rab25 directly interacts with the β1 integrin cytoplasmic tail, and this association promotes localization of integrin-recycling vesicles to pseudopodial tips and retention of a cycling pool of α5β1 at the cell front, driving invasive migration on 3D matrices. Rab25-driven tumor-cell invasion was strongly dependent on fibronectin ligation by α5β1 and the capacity of Rab25 to interact with β1 integrin.\",\n      \"method\": \"Direct interaction assay (β1 integrin cytoplasmic tail pulldown), live-cell imaging of vesicle localization, 3D matrix invasion assay, fibronectin dependence assay, interaction-deficient mutants\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct binding demonstrated, coupled with functional rescue and 3D invasion assays; highly cited\",\n      \"pmids\": [\"17925226\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Rab25 deficiency in mice crossed onto ApcMin/+ background produced a 4-fold increase in intestinal polyps and 2-fold increase in colonic tumors, demonstrating a tumor suppressor function. Rab25-deficient mice showed decreased β1 integrin staining in lateral membranes of villus cells, indicating Rab25 regulates β1 integrin trafficking to the cell surface in intestinal epithelium.\",\n      \"method\": \"Rab25 knockout mouse model, ApcMin/+ genetic cross, Smad3+/- genetic cross, immunostaining for β1 integrin, polyp/tumor counting\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis in mouse models with multiple crosses and defined cellular phenotype\",\n      \"pmids\": [\"20197623\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Rab25 directs active-conformation α5β1 integrin to late endosomes/lysosomes where, together with CLIC3, integrins are retrogradely transported and recycled to the plasma membrane at the back of invading cells rather than being degraded. CLIC3 is upregulated in Rab25-expressing cells, colocalizes with active α5β1 in late endosomes/lysosomes, and is required for release of the cell rear during migration and for maintenance of active Src signaling.\",\n      \"method\": \"Photoactivation of fluorescent proteins, biochemical fractionation, CLIC3 knockdown, 3D matrix invasion assay, active-conformation integrin antibody localization, Src signaling assay\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (photoactivation, biochemistry, functional assays) with clear mechanistic pathway placement\",\n      \"pmids\": [\"22197222\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Overexpression of Rab25 in non-transformed rat intestinal epithelial (RIE) cells leads to morphological transformation, anchorage-independent growth, tumor formation in nude mice, disruption of integrin-based focal adhesions, and alteration of microtubule subsets. Transformation by Rab25 (but not H-RasV12) was reversed by inhibitors of microtubule polymerization, identifying microtubule-dependent trafficking as the mechanism.\",\n      \"method\": \"Rab25 overexpression in RIE cells, soft-agar colony assay, nude mouse xenograft, focal adhesion immunostaining, microtubule inhibitor treatment, comparison with H-RasV12 transformation\",\n      \"journal\": \"Cytoskeleton (Hoboken, N.J.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — loss-of-function pharmacological rescue identifies microtubule dependence as mechanistically distinct from Ras-driven transformation\",\n      \"pmids\": [\"21246754\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"RAB25 enhances survival during nutrient stress by directly binding and activating AKT, leading to increased glucose uptake, elevated cellular ATP levels, and glycogen accumulation in epithelial cancer cells—a function not previously attributed to Rab25.\",\n      \"method\": \"RAB25 overexpression/knockdown in cancer cells, AKT binding assay, glucose uptake assay, ATP measurement, glycogen staining, nutrient deprivation survival assay\",\n      \"journal\": \"EMBO molecular medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — AKT binding demonstrated with multiple metabolic readouts across conditions\",\n      \"pmids\": [\"22253197\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Grhl2 transcriptionally upregulates Rab25, which in turn increases Claudin-4 protein levels and enhances its localization to tight junctions in liver progenitor epithelial cells, coordinating epithelial lumen formation in 3D culture.\",\n      \"method\": \"Grhl2 cDNA transfection, 3D cyst culture, Claudin-4 localization by immunofluorescence, Rab25 overexpression, functional tight junction assay\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — defined pathway position (Grhl2→Rab25→Claudin-4 at TJ) with 3D functional assay, single lab\",\n      \"pmids\": [\"22696678\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Crystal structure of Rab25 in complex with the C-terminal FIP2 coiled-coil domain revealed a heterotetrameric Rab25-(FIP2)2-Rab25 complex. Thermodynamic analysis showed FIP2 binds Rab25 with ~3-fold weaker affinity than Rab11a, attributable to subtle conformational differences in switch 1 and switch 2 regions. Rab25 can recruit FIP2 to endosomal membranes in cells.\",\n      \"method\": \"Crystal structure determination, isothermal titration calorimetry (ITC), cellular co-localization of Rab25 with FIP2 on endosomal membranes\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure with thermodynamic characterization and cellular validation\",\n      \"pmids\": [\"24056041\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Rab25 knockdown in polarized Caco2-BBE intestinal epithelial cells decreased α2-, α5-, and β1-integrin expression, with direct colocalization and co-immunoprecipitation demonstrating Rab25 directly associates with α5β1 integrins. Rab25 loss also upregulated claudin-1, increased transepithelial resistance, increased invasive behavior, and disorganized brush border microvilli. These phenotypes were rescued by reintroduction of Rab25. Rab25 regulated α5-integrin at the transcriptional level via the transcription factor ETV4.\",\n      \"method\": \"shRNA knockdown and rescue, Co-IP of Rab25 with α5β1 integrin, transepithelial resistance measurement, invasion assay, transcriptomics, ETV4 overexpression rescue\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP combined with shRNA knockdown/rescue and multiple orthogonal phenotypic readouts\",\n      \"pmids\": [\"23345591\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Rab25 regulates invasion and actin organization in head and neck squamous cell carcinoma (HNSCC): reexpression of Rab25 in a metastatic HNSCC cell line blocked invasion in 3D collagen matrix and metastasis to cervical lymph nodes in a mouse oral cancer model. Rab25 specifically affected F-actin organization at the cell surface rather than cell proliferation, apoptosis, or angiogenesis.\",\n      \"method\": \"Intravital microscopy in live animals, 3D collagen matrix invasion assay, in vivo lymph node metastasis model, F-actin staining\",\n      \"journal\": \"Clinical cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo metastasis model combined with intravital microscopy and specific mechanistic readout (F-actin organization)\",\n      \"pmids\": [\"23340300\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Rab25 regulates secretion of osteoprotegerin (OPG) at both the transcriptional and secretion level; RAB25 expression increased OPG mRNA and protein secretion from ovarian and breast cancer cells, protecting them from TRAIL-induced cell death. This effect cooperated with EGFR-mediated MAPK signaling.\",\n      \"method\": \"RAB25 overexpression/siRNA knockdown, OPG ELISA in conditioned media, TRAIL cytotoxicity assay, EGFR inhibitor combination, pharmacogenetic pathway analysis\",\n      \"journal\": \"Journal of genetic syndromes & gene therapy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional link between Rab25, OPG secretion, and TRAIL resistance demonstrated, but single lab\",\n      \"pmids\": [\"25520884\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Rab25 regulates HIF-1α protein expression in an oxygen-independent manner via the ErbB2/ERK1/2 and p70S6K/mTOR pathways, requiring de novo protein synthesis rather than transcriptional upregulation. Rab25 expression induces HIF-1 transcriptional activity, increases cisplatin resistance, and confers intraperitoneal growth capacity in ovarian cancer cells.\",\n      \"method\": \"RAB25 overexpression in A2780 and SKOV3 cells, HIF-1α protein/mRNA analysis, signaling inhibitor panel (ErbB2, ERK1/2, mTOR inhibitors), HIF-1β siRNA knockdown, in vivo peritoneal carcinomatosis model\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — pathway identified by inhibitor panel and genetic knockdown with in vivo validation, single lab\",\n      \"pmids\": [\"26967059\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"In hepatic stellate cells (HSCs), ROS-dependent Rab25 overexpression promotes the interaction of Rab25 with PI3KCIII (VPS34), directing autophagy to recognize and degrade lipid droplets during HSC activation. Rab25 siRNA blocked autophagic targeting of lipid droplets; antioxidant scavenging of ROS disrupted the Rab25-autophagy interaction.\",\n      \"method\": \"Rab25 siRNA, autophagy inhibition (Atg5 siRNA), ROS scavengers (GSH, NAC), Co-IP of Rab25 with PI3KCIII, lipid droplet staining, autophagic flux assay\",\n      \"journal\": \"Redox biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP identifies PI3KCIII as Rab25 binding partner with functional consequence, but single lab\",\n      \"pmids\": [\"28038427\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Rab25 expression in arterial smooth muscle cells (myocytes) promotes surface expression of CaV1.2 calcium channels by preventing their lysosomal and proteasomal degradation. Rab25 co-localizes in close spatial proximity to CaV1.2 channels (immunoFRET). Rab25 knockdown reduced CaV1.2 surface and intracellular abundance, reduced whole-cell CaV1.2 current density, and inhibited pressure- and depolarization-induced vasoconstriction in cerebral arteries.\",\n      \"method\": \"siRNA knockdown in cerebral artery myocytes, surface biotinylation assay, immunoFRET microscopy, whole-cell patch-clamp electrophysiology, myogenic tone measurement\",\n      \"journal\": \"American journal of physiology. Cell physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (FRET, biotinylation, electrophysiology, vascular function) with clean KD phenotype\",\n      \"pmids\": [\"27076616\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Stapled peptides (RFP14) derived from the RAB-binding FIP-family inhibit RAB25:FIP complex formation, exhibit increased structural stability, binding affinity, and cell permeability. RFP14 inhibits migration and proliferation in RAB25 pro-oncogenic cell lines and augments these phenotypes in tumor-suppressive RAB25 contexts, validating the RAB25:FIP interaction as mechanistically important for context-specific oncogenic functions.\",\n      \"method\": \"All-hydrocarbon stapled peptide synthesis, binding affinity measurement, cell permeability assay, RAB25:FIP co-IP disruption assay, migration/proliferation assay in RAB25-expressing vs. RAB25-low cell lines, transcriptional profiling\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — chemical biology with in vitro binding, cellular target engagement, and functional validation across multiple contexts\",\n      \"pmids\": [\"28939823\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"RIN1 interacts with Rab25 as a functional binding partner in renal cell carcinoma. Rab25 knockdown eliminated the augmentation of cell proliferation, migration, and invasion conferred by ectopic RIN1 expression, placing Rab25 downstream of RIN1 in activation of EGFR signaling in ccRCC.\",\n      \"method\": \"Co-IP of RIN1 with Rab25, gain/loss-of-function experiments, epistasis (Rab25 knockdown rescues RIN1 overexpression phenotype), EGFR signaling assay\",\n      \"journal\": \"Cancer science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP plus epistasis experiment placing Rab25 downstream of RIN1, single lab\",\n      \"pmids\": [\"28612496\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Rab25 increases β1 integrin levels at the plasma membrane, leading to sequential activation of EGFR and upregulation of VEGF-A expression, increased Snail and fascin expression, and epithelial-to-mesenchymal transition and cancer cell invasiveness. Snail was identified as the mediator of Rab25-induced fascin expression.\",\n      \"method\": \"Rab25 overexpression, β1 integrin surface expression assay, EGFR phosphorylation, VEGF-A ELISA, Snail/fascin Western blot, 3D invasion assay, in vivo lung metastasis model\",\n      \"journal\": \"Experimental & molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ordered signaling pathway established with multiple readouts, single lab\",\n      \"pmids\": [\"29371698\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"ZEB2 binds to E-box sequences on the RAB25 promoter and stably represses RAB25 expression through epigenetic mechanisms requiring DNA methyltransferases (DNMTs) for local DNA hypermethylation and SIRT1 for H3K9 deacetylation. SIRT1 inhibition decreased long-term repression stability but did not prevent ZEB2-mediated RAB25 downregulation directly. RAB25 partially suppresses ZEB2-mediated cell migration.\",\n      \"method\": \"Conditional ZEB2 expression system, ChIP for ZEB2 binding to RAB25 promoter E-boxes, bisulfite sequencing for DNA methylation, H3K9ac ChIP, SIRT1 inhibitor treatment, cell migration assay\",\n      \"journal\": \"Epigenetics & chromatin\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — ChIP, bisulfite sequencing, and inhibitor studies directly establish the epigenetic mechanism of ZEB2-mediated RAB25 repression\",\n      \"pmids\": [\"30445998\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Rab25 interacts with β1 integrin and promotes its trafficking to the cytoplasmic membrane, leading to membrane β1 integrin-induced AKT phosphorylation and subsequent activation of the Wnt/β-catenin signaling pathway to promote cell proliferation and erlotinib resistance in NSCLC cells.\",\n      \"method\": \"Co-immunoprecipitation of Rab25 with β1 integrin, cell fractionation to assess membrane β1 integrin levels, AKT/β-catenin Western blot, lentiviral knockin/knockout, cell proliferation and drug resistance assays in vitro and in vivo\",\n      \"journal\": \"Cell proliferation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP plus pathway activation assay, single lab\",\n      \"pmids\": [\"30848009\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Loss of Rab25 in skin keratinocytes causes dysregulation of integrin β1, β4, and α6 trafficking, impairs their recycling, and promotes squamous cell carcinoma development. In a two-stage mouse skin carcinogenesis model, Rab25 knockout significantly accelerated tumor generation and malignant transformation.\",\n      \"method\": \"Rab25 knockout mice, two-stage skin carcinogenesis (DMBA/TPA) model, HaCaT xenograft, integrin expression/localization immunostaining, integrin recycling assay\",\n      \"journal\": \"The Journal of pathology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo genetic model with integrin trafficking mechanistic readout and xenograft validation\",\n      \"pmids\": [\"31144312\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"RAB25 interacts with EGFR and enhances EGFR recycling to the cell surface while decreasing its degradation in the cytoplasm, leading to hyperactive EGFR signaling and acquired radioresistance in lung and nasopharyngeal cancer cells.\",\n      \"method\": \"Co-IP of Rab25 with EGFR, EGFR surface expression assay, EGFR degradation kinetics, RAB25 knockdown with radiosensitivity assay in vitro and in vivo\",\n      \"journal\": \"iScience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP and receptor recycling/degradation assay with functional consequence, single lab\",\n      \"pmids\": [\"32252020\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"In zebrafish gastrula epithelium, Rab25 localizes near cytokinetic midbodies and coordinates abscission through endomembrane trafficking. Loss of maternal-zygotic Rab25a and Rab25b results in persistent apical cytokinetic bridges that fail timely abscission, causing anisotropic cell morphologies, reduced contractile actomyosin networks, slowed cell rearrangements, altered tissue viscoelastic responses, and delayed epiboly.\",\n      \"method\": \"Maternal-zygotic Rab25a/Rab25b double mutant zebrafish, live imaging of cytokinetic bridges, actomyosin network quantification, tissue mechanical measurements\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic loss-of-function in zebrafish (ortholog) with defined cellular and tissue-level mechanistic readouts across multiple methods\",\n      \"pmids\": [\"33755014\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Rab25 co-locates on the cell membrane with PKM2 in gastric adenocarcinoma cells and can directly bind to PKM2 as shown by co-immunoprecipitation. Rab25 acts as a positive regulator of PKM2, promoting PKM2 phosphorylation (Y105) and thereby participating in the regulation of aerobic glycolysis.\",\n      \"method\": \"Co-immunoprecipitation of Rab25 with PKM2, immunofluorescence co-localization, lactate/pyruvate measurement, lentiviral overexpression/silencing\",\n      \"journal\": \"Translational cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — Co-IP identifies PKM2 as binding partner with functional glycolysis readout, single lab\",\n      \"pmids\": [\"35116410\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"RAB25 coordinates keratohyalin granule (KHG) maturation and filaggrin processing in epidermis by regulating actin dynamics. In HaCaT keratinocytes, RAB25 co-expresses with filaggrin-containing KHGs, and RAB25 silencing impairs KHG formation through abnormal actin dynamics. RAB25 knockout mice show disrupted stratum corneum, skin barrier dysfunction, and decreased KHG production.\",\n      \"method\": \"RAB25 knockout mice, RAB25 siRNA in HaCaT cells, KHG immunofluorescence, actin dynamics assay, trans-epidermal water loss measurement, comparison with human AD skin specimens\",\n      \"journal\": \"Allergy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic knockout with cellular silencing and actin mechanism identified, single lab\",\n      \"pmids\": [\"36383036\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"RAB25 promotes ADAMTS5 expression in ovarian cancer cells through activation of the NF-κB signaling pathway. ADAMTS5 is necessary and sufficient to stimulate ovarian cancer cell migration through fibroblast-secreted matrices, identifying it as a downstream effector of Rab25-driven invasion.\",\n      \"method\": \"RAB25 overexpression/knockdown with ADAMTS5 expression readout, NF-κB pathway inhibition, ADAMTS5 knockdown/overexpression, 3D spheroid invasion assay, selective ADAMTS5 inhibitor treatment\",\n      \"journal\": \"The FEBS journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — epistasis experiment placing ADAMTS5 downstream of RAB25/NF-κB with 3D functional assay, single lab\",\n      \"pmids\": [\"40164572\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"RAB25 loss in gastric epithelial cells facilitates TGF-α secretion, which promotes upregulation of EGFR signaling in pit cells. In Rab25 KO mice, long-term altered TGFA secretion caused foveolar hyperplasia ameliorated by TGFA neutralization, establishing a physiological role for Rab25 in regulating gastric pit lineage commitment through control of TGFA secretory trafficking.\",\n      \"method\": \"Rab25 KO mice, mouse primary gastric cell culture, TGFA secretion assay, EGFR signaling measurement, TGFA-neutralizing antibody treatment, single-cell RNA sequencing analysis\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO with rescue by TGFA neutralization and defined signaling mechanism, single lab\",\n      \"pmids\": [\"41365858\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"RAB25 interacts with GCN1, inhibits K33-ubiquitination-mediated degradation of GCN1, and thereby promotes GCN2 phosphorylation and ATF4-mediated ER stress, contributing to alcohol-associated liver disease progression. RAB25 specifically accumulated on the ER in ALD.\",\n      \"method\": \"Mass spectrometry identification of RAB25-GCN1 interaction, Co-IP assay, ubiquitination assay, GCN2/ATF4 phosphorylation Western blot, RAB25 knockdown in hepatocytes, in vivo ALD mouse model\",\n      \"journal\": \"Clinical and molecular hepatology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — MS plus Co-IP identifies GCN1 as RAB25 binding partner, ubiquitination mechanism defined, functional in vivo validation\",\n      \"pmids\": [\"40916695\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"The core promoter of human RAB25 contains a CRE element (-67/-58) that binds CREB, as demonstrated by EMSA and ChIP. PKA activation (forskolin) enhances chromatin accessibility at the RAB25 promoter, promotes CREB phosphorylation, recruits co-factors CBP and BRG1, and increases RAB25 expression. Deletion of the CRE abolished promoter activity.\",\n      \"method\": \"5'-deletion luciferase reporter assay, EMSA, ChIP for CREB binding, chromatin accessibility assay (PCR-based), forskolin (PKA activator) treatment\",\n      \"journal\": \"The international journal of biochemistry & cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 — in vitro and cellular biochemical assays for promoter mechanism, single lab\",\n      \"pmids\": [\"21075212\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"An APEX2 proximity labeling screen identified DENND6A as a physical interacting partner of RAB25, and this interaction affects cell migration.\",\n      \"method\": \"APEX2 proximity labeling mass spectrometry, interaction validation, cell migration assay\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — proximity labeling with functional follow-up, preprint, single lab\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Magnetogenetic repositioning of endogenous Rab25 vesicles to the cell periphery directly drives formation of F-actin protrusions. Rab25 vesicles coordinate localization of the actin regulator FMNL1 and integrin β1 with activation of Rho GTPases at the plasma membrane to generate filopodial protrusions and promote cancer cell invasive migration in 3D matrix.\",\n      \"method\": \"Magnetogenetic manipulation of Rab25 vesicle positioning, live-cell F-actin imaging, FMNL1 and β1 integrin co-localization, Rho GTPase activation biosensor, 3D matrix invasion assay\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 — direct causal manipulation of Rab25 vesicle position with real-time F-actin readout; preprint but orthogonal mechanistic approach\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"RAB25 is an epithelial-specific Rab11-subfamily small GTPase that cycles between GDP/GTP states to regulate apical recycling endosome function: it directly binds the β1 integrin cytoplasmic tail and FIP-family effectors (FIP2) to route α5β1 integrin and other cargoes (EGFR, CaV1.2, TGF-α) through late endosomes/lysosomes (in concert with CLIC3) or back to specific plasma membrane domains, thereby controlling cell polarity, invasive migration, cytokinetic abscission, and bioenergetics (via AKT activation and glycogen storage), with its context-dependent oncogenic or tumor-suppressive output determined by cell lineage, co-expression of effectors such as RCP, and epigenetic silencing by ZEB2/SIRT1/DNMTs.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"RAB25 is an epithelial-enriched Rab11-family small GTPase that governs vesicular trafficking through the apical recycling endosome and late endosome/lysosome compartments, thereby controlling integrin and receptor recycling, cell polarity, cytokinetic abscission, and metabolic adaptation. RAB25 directly binds the β1 integrin cytoplasmic tail and FIP-family effectors (forming a heterotetrameric Rab25-(FIP2)₂-Rab25 complex) to route α5β1 integrin, EGFR, CaV1.2, and TGF-α to specific plasma membrane domains, with CLIC3 cooperating in retrograde transport from late endosomes [PMID:17925226, PMID:24056041, PMID:22197222, PMID:27076616, PMID:41365858]. RAB25 activates AKT to promote glucose uptake, glycogen storage, and survival under nutrient stress, and its context-dependent oncogenic versus tumor-suppressive activity is determined by cell lineage, co-expressed effectors such as RCP/FIPs, and epigenetic silencing by ZEB2 acting through DNMTs and SIRT1-mediated H3K9 deacetylation [PMID:22253197, PMID:28939823, PMID:30445998, PMID:20197623]. In vivo, Rab25 loss accelerates intestinal and skin tumorigenesis through dysregulated integrin trafficking, impairs cytokinetic abscission in zebrafish gastrula epithelium, disrupts epidermal barrier function by impairing keratohyalin granule maturation, and deregulates gastric pit cell fate through aberrant TGF-α secretion [PMID:20197623, PMID:31144312, PMID:33755014, PMID:36383036, PMID:41365858].\",\n  \"teleology\": [\n    {\n      \"year\": 1993,\n      \"claim\": \"Identification of RAB25 as a novel epithelial-restricted Rab GTPase with a unique GTP-binding motif (WDTAGLE) established it as a distinct Rab11-subfamily member requiring functional characterization.\",\n      \"evidence\": \"3'-RACE cloning, GTP-binding blot assay, and Northern blot tissue distribution from rabbit parietal cells\",\n      \"pmids\": [\"8360141\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No effector partners identified\", \"No functional assay beyond GTP binding\", \"Mammalian subcellular localization not determined\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Demonstration that Rab25 co-localizes with Rab11a at the apical recycling endosome and selectively regulates apical transcytosis and recycling (but not basolateral trafficking) in polarized epithelial cells placed it as a pathway-specific regulator of polarized membrane traffic.\",\n      \"evidence\": \"Transfection and dominant-negative expression in polarized MDCK cells with IgA transcytosis and recycling assays\",\n      \"pmids\": [\"9880326\", \"10869360\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cargo identity beyond IgA not defined\", \"Effector mechanism unknown\", \"In vivo relevance not tested\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"The finding that RAB25 overexpression promoted cancer cell proliferation, anoikis resistance, and in vivo tumor aggressiveness via AKT activation revealed an unexpected oncogenic function for a trafficking GTPase.\",\n      \"evidence\": \"RAB25 overexpression in ovarian/breast cancer cells with proliferation, apoptosis, anoikis, and xenograft assays\",\n      \"pmids\": [\"15502842\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct AKT binding not yet demonstrated\", \"Mechanism connecting trafficking to AKT unclear\", \"Context dependence not appreciated\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Identification of β1 integrin as a direct cargo of Rab25 explained how vesicle trafficking controls invasive migration: Rab25 binds the β1 integrin cytoplasmic tail and delivers α5β1-containing vesicles to pseudopodial tips during 3D invasion.\",\n      \"evidence\": \"Direct pulldown with β1 integrin cytoplasmic tail, live-cell vesicle imaging, and 3D matrix invasion assays\",\n      \"pmids\": [\"17925226\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Route through endosomal compartments not mapped\", \"Role of FIP effectors in integrin delivery not tested\", \"Whether other integrins are direct cargoes unknown\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Genetic loss of Rab25 in mice accelerated intestinal tumorigenesis on ApcMin/+ background, establishing that Rab25 functions as a tumor suppressor in intestinal epithelium — the first evidence of its context-dependent dual role in cancer.\",\n      \"evidence\": \"Rab25 knockout mouse crossed to ApcMin/+ and Smad3+/- backgrounds with tumor quantification and β1 integrin localization\",\n      \"pmids\": [\"20197623\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of tumor suppression vs. oncogenic activity not resolved\", \"Cell-autonomous vs. non-autonomous effects not distinguished\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"The discovery that Rab25 routes active-conformation α5β1 integrin through late endosomes/lysosomes for CLIC3-dependent retrograde recycling (rather than degradation) defined a non-canonical recycling pathway that controls rear-end retraction during cell invasion.\",\n      \"evidence\": \"Photoactivation of fluorescent proteins, biochemical fractionation, CLIC3 knockdown, and 3D invasion assays\",\n      \"pmids\": [\"22197222\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How Rab25 prevents lysosomal degradation of integrins mechanistically unclear\", \"CLIC3 recruitment mechanism not defined\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Demonstration that RAB25 directly binds and activates AKT to increase glucose uptake, ATP, and glycogen storage connected Rab25 trafficking to metabolic reprogramming and survival under nutrient stress.\",\n      \"evidence\": \"AKT binding assay, glucose uptake, ATP measurement, glycogen staining in cancer cells under nutrient deprivation\",\n      \"pmids\": [\"22253197\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of RAB25–AKT interaction unknown\", \"Whether AKT binding requires GTP-loaded state not tested\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"The crystal structure of Rab25 in complex with FIP2 revealed a heterotetrameric architecture and subtle switch-region differences explaining the ~3-fold weaker affinity compared to Rab11a, providing the first structural basis for effector selectivity within the Rab11 subfamily.\",\n      \"evidence\": \"X-ray crystallography, isothermal titration calorimetry, and cellular co-localization of Rab25–FIP2 on endosomal membranes\",\n      \"pmids\": [\"24056041\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structures with other FIP family members not available\", \"How differential FIP affinity translates to cargo selectivity in cells unknown\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Multiple studies converged on Rab25's role in controlling integrin expression, tight junction composition, and F-actin organization: Rab25 knockdown decreased α5β1 integrin levels partly via ETV4-dependent transcription, while Rab25 re-expression in HNSCC blocked invasion and metastasis by reorganizing cortical F-actin.\",\n      \"evidence\": \"shRNA knockdown/rescue with Co-IP in Caco2-BBE cells; intravital imaging and 3D invasion in HNSCC mouse model\",\n      \"pmids\": [\"23345591\", \"23340300\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether ETV4 regulation is direct or indirect not fully resolved\", \"Actin-regulatory mechanism downstream of Rab25 not identified\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Rab25 was found to regulate CaV1.2 calcium channel surface expression in arterial smooth muscle by preventing lysosomal/proteasomal degradation, expanding its trafficking function beyond epithelial cells to vascular physiology.\",\n      \"evidence\": \"siRNA knockdown in cerebral artery myocytes with surface biotinylation, immunoFRET, patch-clamp electrophysiology, and myogenic tone measurement\",\n      \"pmids\": [\"27076616\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether Rab25 directly binds CaV1.2 not demonstrated\", \"Mechanism distinguishing lysosomal vs. proteasomal protection unclear\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Stapled peptides disrupting the RAB25:FIP interaction validated this complex as the functional unit driving context-dependent oncogenic or tumor-suppressive outputs, providing the first pharmacological tool to dissect Rab25 effector engagement.\",\n      \"evidence\": \"Stapled peptide (RFP14) synthesis with binding assays, Co-IP disruption, and migration/proliferation assays across multiple cell contexts\",\n      \"pmids\": [\"28939823\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo pharmacokinetics not established\", \"Which specific FIP family member mediates each cellular context not resolved\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Identification of ZEB2 as a direct transcriptional repressor of RAB25 via E-box binding, DNMT-mediated promoter methylation, and SIRT1-dependent H3K9 deacetylation established the epigenetic mechanism by which EMT programs silence RAB25.\",\n      \"evidence\": \"ChIP for ZEB2 at RAB25 promoter E-boxes, bisulfite sequencing, H3K9ac ChIP, SIRT1 inhibitor treatment in conditional ZEB2 system\",\n      \"pmids\": [\"30445998\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether other EMT transcription factors (Snail, Twist) similarly regulate RAB25 not tested\", \"Reversibility of epigenetic silencing in tumors not explored\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Rab25 loss in skin keratinocytes accelerated chemical carcinogenesis by dysregulating recycling of integrins β1, β4, and α6, extending the tumor-suppressor role to stratified squamous epithelium and broadening the cargo repertoire.\",\n      \"evidence\": \"Rab25 knockout mice in two-stage skin carcinogenesis model with integrin localization and recycling assays\",\n      \"pmids\": [\"31144312\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether integrin α6β4 is a direct Rab25 cargo not demonstrated\", \"Interaction with hemidesmosome assembly not explored\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Zebrafish maternal-zygotic Rab25a/b mutants revealed a conserved role in cytokinetic abscission: Rab25 delivers endomembrane to midbodies, and its loss causes persistent apical bridges, altered actomyosin networks, and delayed epiboly, linking Rab25 trafficking to tissue mechanics.\",\n      \"evidence\": \"Maternal-zygotic double mutant zebrafish with live imaging of cytokinetic bridges, actomyosin quantification, and tissue mechanical measurements\",\n      \"pmids\": [\"33755014\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific abscission cargo delivered by Rab25 not identified\", \"Whether this role is conserved in mammalian cytokinesis unknown\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"RAB25 was shown to coordinate keratohyalin granule maturation and filaggrin processing in epidermis through regulation of actin dynamics, linking its trafficking function to skin barrier integrity.\",\n      \"evidence\": \"RAB25 knockout mice and siRNA in HaCaT cells with KHG immunofluorescence, actin dynamics assay, and trans-epidermal water loss measurement\",\n      \"pmids\": [\"36383036\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which Rab25 regulates actin at KHGs not defined\", \"Whether FIP effectors are involved in this process untested\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"RAB25 loss in gastric epithelium deregulates TGF-α secretory trafficking, driving EGFR-dependent foveolar hyperplasia that is rescued by TGF-α neutralization, establishing a physiological role in gastric pit cell lineage commitment.\",\n      \"evidence\": \"Rab25 KO mice, primary gastric cell culture, TGFA secretion assay, TGFA-neutralizing antibody rescue, scRNA-seq\",\n      \"pmids\": [\"41365858\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether TGF-α is a direct Rab25 vesicle cargo not shown\", \"Long-term cancer risk from chronic TGF-α deregulation not assessed\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Discovery that RAB25 stabilizes GCN1 by inhibiting K33-ubiquitination, promoting GCN2–ATF4 ER stress signaling in alcohol-associated liver disease, revealed a non-canonical role in protein quality control beyond classical vesicle trafficking.\",\n      \"evidence\": \"Mass spectrometry, Co-IP, ubiquitination assay, GCN2/ATF4 phosphorylation analysis, in vivo ALD mouse model\",\n      \"pmids\": [\"40916695\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether Rab25 GTPase activity is required for GCN1 stabilization unknown\", \"Generalizability beyond ALD not tested\", \"Single study without independent replication\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The molecular basis of RAB25's context-dependent switch between oncogenic and tumor-suppressive functions remains incompletely defined: it is unclear which specific FIP effector combinations, integrin cargo repertoires, and epigenetic states determine the outcome in each tissue lineage.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No systematic mapping of Rab25 effector complexes across tissue contexts\", \"Structural basis of β1 integrin tail recognition by Rab25 unresolved\", \"Role of GTP/GDP cycling kinetics in cargo selection not characterized\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003924\", \"supporting_discovery_ids\": [0, 2]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [8, 16, 17]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [4, 10, 11]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [1, 6, 10]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [1, 4, 24]},\n      {\"term_id\": \"GO:0005764\", \"supporting_discovery_ids\": [6]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [16, 25]},\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [29]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [1, 2, 4, 6, 16, 22, 23]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [3, 8, 19, 21]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [24]},\n      {\"term_id\": \"R-HSA-1500931\", \"supporting_discovery_ids\": [9, 11]},\n      {\"term_id\": \"R-HSA-1474244\", \"supporting_discovery_ids\": [4, 11, 19]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [8, 25]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [20]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [3, 13]}\n    ],\n    \"complexes\": [\n      \"Rab25-(FIP2)2-Rab25 heterotetramer\"\n    ],\n    \"partners\": [\n      \"ITGB1\",\n      \"RAB11FIP2\",\n      \"CLIC3\",\n      \"AKT1\",\n      \"EGFR\",\n      \"GCN1\",\n      \"RIN1\",\n      \"PKM\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}