{"gene":"RAB25","run_date":"2026-06-10T06:43:36","timeline":{"discoveries":[{"year":1993,"finding":"RAB25 was identified as a novel small GTP-binding protein with a unique carboxyl-terminal CCQNI motif and a novel GTP-binding site sequence (WDTAGLE); recombinant Rab25 was able to bind GTP on blot. Its expression was restricted to gastrointestinal mucosa, lung, and kidney, with enrichment in parietal cells.","method":"3'-RACE cloning, GTP-binding blot assay, Northern blot","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — direct in vitro GTP-binding assay established biochemical activity; single lab, single paper","pmids":["8360141"],"is_preprint":false},{"year":1999,"finding":"Rab25 localizes to subapical vesicles and colocalizes with Rab11a in the apical recycling endosome of polarized MDCK cells. Overexpression of Rab25 decreased the rate of IgA transcytosis and of apical (but not basolateral) recycling. The dominant-negative Rab25T26N did not alter apical recycling or transcytosis.","method":"Transfection in MDCK cells, immunofluorescence colocalization, quantitative transcytosis/recycling assays, dominant-negative and wild-type constructs","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal functional assays with wild-type and dominant-negative constructs, selective apical vs. basolateral pathway dissection, single lab with multiple orthogonal methods","pmids":["9880326"],"is_preprint":false},{"year":2000,"finding":"Using inducible expression of wild-type, dominant-negative, and constitutively active mutants, both Rab25 wild-type (S21V) and the constitutively active mutant inhibited apical IgA recycling and transcytosis by >50% but had no effect on basolateral transferrin recycling. The GTPase-deficient Rab11aS20V inhibited basolateral-to-apical transcytosis but not recycling, establishing distinct roles for GTP-binding state in apical trafficking.","method":"Inducible expression of wild-type, dominant-negative (Rab25S21V), and constitutively active mutants in MDCK cells; quantitative IgA transcytosis and transferrin recycling assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — multiple mutant constructs with quantitative trafficking assays, selective pathway dissection with multiple orthogonal measurements in one rigorous study","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, and increased tumor aggressiveness in vivo. The inhibition of apoptosis was associated with decreased expression of proapoptotic BAK and BAX, and activation of the PI3K/AKT pathway.","method":"Transfection/forced expression, soft agar assays, in vivo tumor growth, Western blot for BAK/BAX, PI3K/AKT pathway analysis","journal":"Nature medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple functional assays (proliferation, anoikis, in vivo), pathway analysis with molecular readouts, replicated across ovarian and breast cancer models","pmids":["15502842"],"is_preprint":false},{"year":2007,"finding":"Rab25 directly interacts with the β1 integrin cytoplasmic tail and promotes localization of integrin-recycling vesicles to pseudopodial tips, retaining a pool of cycling α5β1 integrin at the cell front. Rab25-driven tumor-cell invasion into 3D extracellular matrix is strongly dependent on fibronectin ligation by α5β1 and requires Rab25's capacity to interact with β1 integrin.","method":"Co-immunoprecipitation (direct interaction), live-cell imaging of vesicle localization, 3D invasion assays on fibronectin matrices, domain-interaction mutants","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct binding shown by Co-IP, functional 3D invasion assay with fibronectin-dependence, mutant constructs, multiple orthogonal methods in single study","pmids":["17925226"],"is_preprint":false},{"year":2010,"finding":"Rab25-deficient mice crossed onto ApcMin/+ background showed a 4-fold increase in intestinal polyps and 2-fold increase in colonic tumors compared to parental ApcMin/+ mice, establishing Rab25 as a tumor suppressor in intestinal neoplasia. Rab25-deficient mice also showed decreased β1 integrin staining in lateral membranes of villus cells. Similarly, Rab25-deficient mice crossed with Smad3+/- mice showed markedly increased colonic tumor formation.","method":"Rab25 knockout mice, genetic epistasis (ApcMin/+, Smad3+/- crosses), immunohistochemistry for β1 integrin, tumor counting","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis with two independent cancer-prone mouse models, in vivo tumor quantification, pathway-specific readout (β1 integrin trafficking)","pmids":["20197623"],"is_preprint":false},{"year":2011,"finding":"Rab25 permits sorting of ligand-occupied, active-conformation α5β1 integrin to late endosomes/lysosomes. Lysosomally targeted integrins are not degraded but are retrogradely transported and recycled to the plasma membrane at the back of invading cells. This requires CLIC3, a protein upregulated in Rab25-expressing cells, which colocalizes with active α5β1 in late endosomes/lysosomes and is necessary for cell rear release during migration.","method":"Photoactivation microscopy, biochemical fractionation, CLIC3 knockdown/overexpression, 3D invasion assays, organotypic cultures, Src signaling assays","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — photoactivation and biochemical approaches are orthogonal methods; functional rescue experiments; identification of CLIC3 as required effector; single lab but multiple rigorous methods","pmids":["22197222"],"is_preprint":false},{"year":2011,"finding":"Overexpression of Rab25 in non-transformed rat intestinal epithelial (RIE) cells caused morphological transformation, growth in soft agar, and tumor formation in nude mice. This transformation was reversed by inhibitors of microtubule polymerization but not by H-Ras(V12)-induced transformation, establishing microtubule-dependent trafficking as the mechanism of Rab25-driven transformation.","method":"Stable overexpression in RIE cells, soft agar assays, nude mouse tumorigenesis, microtubule inhibitor treatment, comparison with H-Ras(V12) transformation","journal":"Cytoskeleton (Hoboken, N.J.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro and in vivo transformation assays with specific pharmacological dissection of mechanism; single lab, multiple assays","pmids":["21246754"],"is_preprint":false},{"year":2012,"finding":"RAB25 enhanced cancer cell survival during nutrient stress by binding and activating AKT, leading to increased glucose uptake, improved cellular bioenergetics, and unexpected accumulation of glycogen in epithelial cancer cells. AKT-dependent increases in glucose uptake and glycogen storage maintained ATP levels during bioenergetic stress.","method":"RAB25 overexpression/knockdown, AKT binding assays, glucose uptake assays, ATP/glycogen quantification, extracellular flux analysis, apoptosis assays under nutrient stress","journal":"EMBO molecular medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct AKT binding, metabolic flux measurements; single lab with multiple orthogonal metabolic methods","pmids":["22253197"],"is_preprint":false},{"year":2012,"finding":"Grhl2 transcriptionally upregulates Rab25 as one of its targets. Rab25 increases claudin-4 protein levels and enhances its localization to tight junctions, contributing to epithelial lumen formation and cyst expansion in 3D cultures.","method":"Grhl2 cDNA transfection, 3D cyst cultures, claudin localization by immunofluorescence, rescue/overexpression experiments","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional rescue and epistasis in 3D cultures, direct transcriptional target identification; single lab, multiple functional readouts","pmids":["22696678"],"is_preprint":false},{"year":2012,"finding":"Rab25 acts as a tumor suppressor in esophageal squamous cell carcinoma (ESCC); functional studies showed Rab25 re-expression suppresses invasion and angiogenesis through a deregulated FAK-Raf-MEK1/2-ERK signaling pathway. Downregulation of Rab25 in ESCC was associated with promoter hypermethylation.","method":"Lentiviral overexpression and suppression, invasion assays, angiogenesis assays, Western blot for FAK-Raf-MEK1/2-ERK pathway, bisulfite sequencing and demethylation treatment","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gain- and loss-of-function with pathway-specific readouts; single lab with multiple orthogonal methods","pmids":["22991305"],"is_preprint":false},{"year":2013,"finding":"Crystal structure of Rab25 in complex with the C-terminal region of FIP2 was determined. Rab25 associates with FIP2 and recruits this effector to endosomal membranes. The structure reveals a heterotetrameric Rab25-(FIP2)2-Rab25 complex. FIP2 binds Rab25 with approximately 3-fold weaker affinity than Rab11a, with reduced enthalpy attributable to differences in switch 1 and switch 2 conformations.","method":"Crystal structure determination, isothermal titration calorimetry (ITC), co-localization by immunofluorescence, thermodynamic analysis","journal":"Biochimica et biophysica acta","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure with thermodynamic validation and cellular colocalization; single lab but multiple orthogonal methods (structure + ITC + cell biology)","pmids":["24056041"],"is_preprint":false},{"year":2013,"finding":"Rab25 directly associates with α5β1 integrins (colocalization and direct association shown) and controls integrin expression in polarized Caco2-BBE cells. Rab25 knockdown decreased α2-, α5-, and β1-integrin expression and upregulated claudin-1 expression, increased transepithelial resistance, and increased invasive behavior. Rab25 loss also decreased the transcription factor ETV4, and ETV4 overexpression in Rab25-knockdown cells reversed losses of α5β1-integrin.","method":"Stable shRNA knockdown, rescue by rabbit Rab25 re-expression, Co-IP/colocalization for direct association, gene expression arrays, transepithelial resistance measurement, invasion assays, ETV4 overexpression epistasis","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct interaction shown, rescue experiment, epistasis with ETV4, multiple orthogonal assays; single lab but comprehensive mechanistic dissection","pmids":["23345591"],"is_preprint":false},{"year":2013,"finding":"Rab25 mediates secretion of osteoprotegerin (OPG), both at the transcription and secretion level. RAB25 expression increased OPG mRNA expression and secretion from ovarian and breast cancer cell lines, protecting cells from TRAIL-induced cell death. Rab25 cooperates with EGFR-mediated MAPK signaling to increase OPG production and release.","method":"Rab25 overexpression/siRNA knockdown, OPG ELISA, mRNA quantification, cell death assays, pharmacogenetic pathway inhibition","journal":"Journal of genetic syndromes & gene therapy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gain- and loss-of-function with secretion assays and pathway inhibition; single lab, multiple assays but lower-tier journal","pmids":["25520884"],"is_preprint":false},{"year":2013,"finding":"Rab25 affects the organization of F-actin at the cell surface in head and neck squamous cell carcinoma (HNSCC). Re-expression of Rab25 in a metastatic HNSCC cell line blocked invasion in 3D collagen matrix and blocked metastasis to cervical lymph nodes in a mouse oral cancer model.","method":"Rab25 re-expression, intravital microscopy, 3D invasion assay, mouse model of oral cancer with lymph node metastasis quantification, F-actin staining","journal":"Clinical cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo metastasis model combined with cellular F-actin phenotype; single lab with in vitro and in vivo orthogonal approaches","pmids":["23340300"],"is_preprint":false},{"year":2016,"finding":"Rab25 regulates HIF-1α protein expression in an oxygen-independent manner in cancer cells, requiring de novo protein synthesis through the Erbb2/ERK1/2 and p70S6K/mTOR pathways (not transcriptional upregulation). Rab25 expression induced HIF-1 transcriptional activity, increased cisplatin resistance, and conferred intraperitoneal growth in vivo. Targeting HIF-1β re-sensitized Rab25-expressing cells to cisplatin.","method":"HIF-1α protein/mRNA analysis, pathway inhibitors (Erbb2/ERK1/2, mTOR), HIF-1β siRNA knockdown, in vivo peritoneal carcinomatosis model, MTT assays","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pathway dissection by multiple inhibitors, in vitro and in vivo validation; single lab","pmids":["26967059"],"is_preprint":false},{"year":2016,"finding":"Rab25 promotes turnover of lipid droplets in hepatic stellate cells (HSCs) through ROS-dependent mechanisms. HSC activation triggers Rab25 overexpression, and Rab25 promotes combination with PI3KCIII to direct autophagy to recognize and degrade lipid droplets. Rab25 siRNA blocked autophagy-mediated lipid droplet disappearance; ROS scavenging disrupted Rab25-autophagy interaction.","method":"Rab25 siRNA knockdown, Atg5 siRNA, autophagosome assays, Co-IP of Rab25 and PI3KCIII, antioxidant treatment, lipid droplet quantification","journal":"Redox biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP of Rab25-PI3KCIII, functional knockdown assays; single lab, multiple orthogonal methods","pmids":["28038427"],"is_preprint":false},{"year":2016,"finding":"Rab25 controls surface expression of CaV1.2 calcium channels in cerebral artery smooth muscle cells. Rab25 localizes in close spatial proximity to CaV1.2 (by immunoFRET); Rab25 knockdown reduced CaV1.2 surface and intracellular abundance, reduced whole-cell CaV1.2 current density, and inhibited pressure- and depolarization-induced vasoconstriction. CaV1.2 degradation upon Rab25 knockdown involved both lysosomal and proteasomal pathways.","method":"Immunofluorescence FRET (immunoFRET), siRNA knockdown, arterial biotinylation surface expression assay, patch-clamp electrophysiology, pressure myography","journal":"American journal of physiology. Cell physiology","confidence":"High","confidence_rationale":"Tier 2 / Strong — proximity measured by FRET, surface expression by biotinylation, electrophysiology, and vasoconstriction assay; multiple orthogonal methods in a single rigorous study","pmids":["27076616"],"is_preprint":false},{"year":2017,"finding":"Stapled peptides derived from the RAB-binding FIP-family protein (RFP14) target RAB25 and inhibit RAB25:FIP complex formation in cells. Treatment with RFP14 inhibits migration and proliferation in a RAB25-dependent manner in pro-oncogenic contexts, and augments these phenotypes in tumor suppressive contexts, validating context-specific RAB25 oncogenic phenotypes.","method":"All-hydrocarbon stapled peptides, cell permeability assays, binding affinity measurements, RAB25:FIP complex inhibition, migration/proliferation assays, transcriptional profiling","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Moderate — reconstituted inhibition of RAB25:FIP complex with chemical probe showing RAB25-dependent phenotypes; multiple orthogonal methods, single lab","pmids":["28939823"],"is_preprint":false},{"year":2018,"finding":"ZEB2 transcriptionally represses RAB25 by binding specifically to E-box sequences on the RAB25 promoter. ZEB2 binding is associated with local increases in DNA methylation (requiring DNMTs) and histone deacetylation (H3K9Ac) depending on SIRT1 activity. RAB25 contributes to partial suppression of ZEB2-mediated cell migration.","method":"Conditional ZEB2 expression, ChIP for ZEB2 at RAB25 promoter E-boxes, bisulfite sequencing for DNA methylation, H3K9Ac ChIP, SIRT1 inhibition, DNMT inhibition, migration assays","journal":"Epigenetics & chromatin","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP for direct promoter binding, epigenetic marks measured by multiple methods; single lab","pmids":["30445998"],"is_preprint":false},{"year":2018,"finding":"Rab25 increases β1 integrin levels and subsequent EGFR activation, upregulating VEGF-A expression and leading to increased Snail expression, EMT, and cancer cell invasiveness. Snail mediates Rab25-induced invasiveness through fascin expression. Ectopic Rab25 expression promotes metastasis of ovarian cancer cells to the lung in vivo.","method":"Rab25 overexpression, Western blot for pathway components (β1 integrin, EGFR, VEGF-A, Snail, fascin), Snail knockdown epistasis, in vivo lung metastasis model","journal":"Experimental & molecular medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — epistasis with Snail knockdown establishes pathway order; in vivo metastasis assay; single lab","pmids":["29371698"],"is_preprint":false},{"year":2019,"finding":"Rab25 interacts with β1 integrin (shown by Co-IP) and promotes trafficking of β1 integrin to the cytoplasmic membrane. Membrane-localized β1 integrin induces AKT phosphorylation and subsequently activates the Wnt/β-catenin signaling pathway, promoting cell proliferation and mediating erlotinib resistance in NSCLC.","method":"Co-immunoprecipitation, Western blot, cell fractionation, lentiviral Rab25 knockin/knockout, cell proliferation and apoptosis assays, in vivo xenograft","journal":"Cell proliferation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP for direct interaction, mechanistic pathway validated by in vitro and in vivo experiments; single lab","pmids":["30848009"],"is_preprint":false},{"year":2019,"finding":"Loss of Rab25 promotes skin squamous cell carcinoma (SCC) development through dysregulation of integrin β1, β4, and α6 trafficking and expression. Rab25 deficiency caused impairment of integrin recycling, and Rab25 knockout mice showed accelerated tumor generation and malignant transformation in a two-stage skin carcinogenesis model.","method":"Rab25 knockout mice, two-stage skin carcinogenesis model, Rab25-deficient keratinocyte xenografts, integrin trafficking assays, immunohistochemistry","journal":"The Journal of pathology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo genetic model with specific integrin trafficking readout, xenograft confirmation; single lab","pmids":["31144312"],"is_preprint":false},{"year":2020,"finding":"Rab25 interacts with EGFR (Co-IP) to enhance EGFR recycling to the cell surface and decrease EGFR degradation in the cytoplasm. This promotes hyperactive EGFR signaling and tumor radioresistance. Inhibition of Rab25 showed synergized radiosensitivity.","method":"Co-immunoprecipitation for Rab25-EGFR interaction, surface EGFR quantification, EGFR recycling/degradation assays, radiosensitivity assays","journal":"iScience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP establishes direct interaction, trafficking assays demonstrate functional consequence; single lab","pmids":["32252020"],"is_preprint":false},{"year":2020,"finding":"RAB25 suppresses chemotherapy-induced mitochondrial apoptosis in ovarian cancer cells upstream of mitochondrial outer membrane permeabilization, either by increasing antiapoptotic BCL-2 proteins or decreasing proapoptotic BCL-2 proteins. BAX expression negatively correlates with RAB25 expression. BH3 profiling confirmed RAB25 decreases mitochondrial cell death priming. Suppressing RAB25 by RNAi or stapled peptide RFP14 sensitizes cells to chemotherapy.","method":"RAB25 siRNA knockdown, RFP14 stapled peptide inhibition, BH3 profiling, Western blot for BCL-2 family members, chemotherapy sensitivity assays","journal":"Apoptosis","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — BH3 profiling as functional mitochondrial assay plus genetic and chemical knockdown, multiple BCL-2 family readouts; single lab","pmids":["32901335"],"is_preprint":false},{"year":2021,"finding":"Rab25 localizes near cytokinetic midbodies in zebrafish gastrula epithelium and coordinates cytokinetic bridge abscission through endomembrane trafficking. Loss of Rab25a and Rab25b caused persistent apical cytokinetic bridges, anisotropic cell morphologies, reduced contractile actomyosin networks, slowed cell rearrangements, and altered viscoelastic tissue responses, all contributing to delayed epiboly.","method":"Maternal-zygotic Rab25a and Rab25b mutant zebrafish, live imaging, immunofluorescence for midbody localization, actomyosin quantification, tissue mechanics measurement","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct localization to midbodies, genetic loss-of-function with specific cytokinesis phenotype, tissue mechanics readout, two orthologous genes tested; rigorous in vivo developmental study","pmids":["33755014"],"is_preprint":false},{"year":2021,"finding":"Rab25 participates in regulation of aerobic glycolysis via PKM2 in gastric adenocarcinoma. Rab25 protein and PKM2 protein co-localize on the cell membrane and directly bind each other. Rab25 is a positive regulator of PKM2 and promotes phosphorylation of PKM2 at Y105.","method":"Co-immunoprecipitation, immunofluorescence colocalization, lentiviral Rab25 silencing/overexpression, pyruvate/lactate quantification, PKM2 phosphorylation by Western blot","journal":"Translational cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and colocalization establish direct binding, phosphorylation assay provides mechanistic readout; single lab","pmids":["35116410"],"is_preprint":false},{"year":2022,"finding":"RAB25 coordinates keratohyalin granule (KHG) maturation by regulating actin dynamics in keratinocytes. RAB25-deficient mice showed decreased KHG production and abnormal KHG processing. In HaCaT cells, RAB25 co-expressed with filaggrin-containing KHG, and RAB25 silencing impaired KHG formation through abnormal actin dynamics.","method":"Rab25 knockout mice, oxazolone AD model, RAB25 siRNA in HaCaT cells, immunofluorescence, KHG quantification, actin dynamics assays","journal":"Allergy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo KO model with in vitro mechanistic follow-up linking RAB25 to actin regulation; single lab","pmids":["36383036"],"is_preprint":false},{"year":2023,"finding":"Rab25 induces claudin-7 expression through protein stabilization in colon cancer cells. Claudin-7 inactivates EGFR and reduces Snail expression; silencing claudin-7 reversed the tumor-suppressive role of Rab25. Rab25 also inactivated EGFR and increased E-cadherin expression.","method":"Rab25 overexpression, claudin-7 knockdown epistasis, 3D Matrigel invasion assay, modified Boyden chamber, Western blot for EGFR/E-cadherin/Snail, claudin-7 protein stability assay","journal":"Oncology reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — epistasis with claudin-7 knockdown establishes pathway order, protein stability assay identifies mechanism; single lab","pmids":["38131227"],"is_preprint":false},{"year":2025,"finding":"RAB25 promotes ADAMTS5 expression through activation of the NF-κB signaling pathway in ovarian cancer cells. ADAMTS5 is necessary and sufficient to stimulate ovarian cancer cell migration through fibroblast-secreted matrices, and selective ADAMTS5 inhibition prevented ovarian cancer spheroid invasion in 3D systems.","method":"Rab25 overexpression/knockdown, NF-κB pathway inhibition and reporter assay, ADAMTS5 knockdown/overexpression, 3D invasion spheroid assays","journal":"The FEBS journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — NF-κB pathway mechanistically linked to ADAMTS5 induction, functional 3D invasion rescue experiments; single lab","pmids":["40164572"],"is_preprint":false},{"year":2025,"finding":"RAB25 interacts with GCN1 (confirmed by mass spectrometry and Co-IP), and this interaction inhibits K33-ubiquitination-mediated degradation of GCN1, promoting GCN2 phosphorylation and subsequently activating ATF4-mediated ER stress in hepatocytes during alcohol-associated liver disease. RAB25 specifically accumulates on the ER in ALD.","method":"Mass spectrometry, Co-immunoprecipitation, K33-ubiquitination assays, GCN2 phosphorylation, ATF4/ER stress markers, RAB25 knockdown in vitro and in vivo","journal":"Clinical and molecular hepatology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct interaction confirmed by MS and Co-IP, mechanistic pathway delineated by ubiquitination and phosphorylation assays; single lab","pmids":["40916695"],"is_preprint":false},{"year":2025,"finding":"RAB25 loss in gastric epithelial cells facilitates TGF-α secretion, which promotes upregulation of EGFR signaling in the pit region and drives pit cell lineage commitment. Long-term alteration of TGF-α secretion in Rab25 KO mice caused gastric lesions with massive foveolar hyperplasia, which was ameliorated by TGF-α neutralization.","method":"Rab25 KO mice, mouse primary cell culture, single-cell RNA sequencing, TGF-α neutralization in vivo, EGFR pathway analysis by Western blot","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO with specific ligand neutralization rescue establishes TGF-α as the mechanistic link; single lab","pmids":["41365858"],"is_preprint":false},{"year":2024,"finding":"Magnetogenetic positioning of Rab25 vesicles to the cell periphery directly drives formation of F-actin protrusions. Endogenous Rab25 vesicles coordinate positioning of actin regulator FMNL1 and integrin β1 with activation of Rho GTPases at the plasma membrane to generate and maintain F-actin rich filopodial protrusions and promote cancer cell invasive migration in 3D matrix.","method":"Magnetogenetic approach for direct Rab25 vesicle positioning, live-cell imaging, F-actin quantification, FMNL1 and integrin β1 colocalization, Rho GTPase biosensor","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct causal manipulation (magnetogenetics) establishes Rab25 vesicle positioning drives protrusion; preprint, not yet peer-reviewed","pmids":[],"is_preprint":true},{"year":2010,"finding":"The RAB25 promoter contains a CRE element (-67/-58) that binds CREB within the core promoter region. PKA activator forskolin enhances open chromatin accessibility at this CRE, facilitating CREB phosphorylation, recruitment of co-factors CBP and Brg1, histone modification, and heightened RAB25 expression.","method":"PCR-based chromatin accessibility assay, ChIP, EMSA, deletion constructs with luciferase reporter, forskolin treatment","journal":"The international journal of biochemistry & cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — EMSA and ChIP establish direct CREB binding, deletion constructs map core promoter element; single lab, multiple orthogonal methods","pmids":["21075212"],"is_preprint":false},{"year":2015,"finding":"CCN3 overexpression in cortical neurons inhibits axonal outgrowth, with RAB25 identified as a downstream effector by transcriptomic analysis. In vivo ectopic expression of RAB25 or dominant-negative RAB25-T26N demonstrated that GTPase activity of RAB25 is required for CCN3-mediated inhibition of neuronal outgrowth.","method":"In vivo cortical electroporation, transcriptomic analysis, RAB25 and dominant-negative RAB25-T26N overexpression, axonal outgrowth quantification","journal":"Biochemical and biophysical research communications","confidence":"Low","confidence_rationale":"Tier 3 / Weak — epistasis established by in vivo electroporation but mechanism is not molecularly resolved beyond GTPase activity requirement; single lab, single publication","pmids":["25871796"],"is_preprint":false}],"current_model":"RAB25 is an epithelial-specific Rab11-subfamily small GTPase that cycles on apical recycling endosomes to regulate selective apical membrane recycling and transcytosis (but not basolateral recycling), directly binds effectors including β1 integrin cytoplasmic tail and FIP2 (crystal structure solved), promotes delivery of recycling vesicles carrying α5β1 integrin and actin regulators (FMNL1) to cell protrusions to drive invasion, activates AKT to enhance bioenergetics and glycogen storage, controls EGFR surface recycling, regulates CaV1.2 channel surface abundance in smooth muscle, coordinates cytokinetic abscission via endomembrane trafficking in epithelia, and modulates apoptosis by suppressing proapoptotic BCL-2 family members (BAX/BAK), with its oncogenic or tumor-suppressive behavior being highly context-dependent across cancer types."},"narrative":{"mechanistic_narrative":"RAB25 is an epithelial-enriched Rab11-subfamily small GTP-binding protein that governs selective apical membrane recycling and the trafficking of cargo to and from the cell surface [PMID:8360141, PMID:9880326]. It localizes to subapical recycling endosomes where it colocalizes with Rab11a and, in a GTP-state-dependent manner, restrains apical IgA recycling and basolateral-to-apical transcytosis without affecting basolateral recycling [PMID:9880326, PMID:10869360]. Mechanistically, RAB25 binds the FIP2 effector—captured in a heterotetrameric Rab25-(FIP2)2-Rab25 crystal structure—and recruits it to endosomal membranes [PMID:24056041], and it directly engages the β1 integrin cytoplasmic tail to position α5β1-integrin-bearing recycling vesicles at invasive cell protrusions, driving fibronectin-dependent 3D invasion [PMID:17925226]. RAB25 coordinates actin-rich protrusion formation by directing FMNL1 and β1 integrin to the periphery alongside Rho GTPase activation, and routes active integrin through CLIC3-dependent late-endosomal recycling for cell-rear release during migration [PMID:22197222]. Beyond trafficking, RAB25 binds and activates AKT to enhance glucose uptake and glycogen storage during nutrient stress [PMID:22253197] and suppresses mitochondrial apoptosis by lowering proapoptotic BAX/BAK priming [PMID:15502842, PMID:32901335]. It controls surface abundance of receptors and channels including EGFR [PMID:32252020] and CaV1.2 in smooth muscle [PMID:27076616], and coordinates cytokinetic abscission via endomembrane trafficking during epithelial morphogenesis [PMID:33755014]. RAB25's role in cancer is sharply context-dependent: it acts as an oncogene promoting integrin- and EGFR-driven invasion and metastasis in some tissues [PMID:17925226, PMID:29371698], yet behaves as a tumor suppressor in intestinal, esophageal, and skin epithelia, where its loss accelerates tumorigenesis and impairs integrin trafficking [PMID:20197623, PMID:22991305, PMID:31144312]. Its expression is set by transcriptional inputs including CREB [PMID:21075212], Grhl2 [PMID:22696678], and ZEB2-mediated epigenetic repression [PMID:30445998].","teleology":[{"year":1993,"claim":"Established RAB25 as a bona fide GTP-binding protein and defined its restricted epithelial expression, framing it as a tissue-specific Rab GTPase rather than a ubiquitous trafficking factor.","evidence":"3'-RACE cloning, GTP-binding blot assay, and Northern blot across tissues","pmids":["8360141"],"confidence":"Medium","gaps":["No effector or subcellular compartment identified","GTP hydrolysis/cycling kinetics not measured"]},{"year":2000,"claim":"Localized RAB25 to apical recycling endosomes and showed it selectively regulates apical recycling and transcytosis but not basolateral recycling, establishing it as a polarity-specific trafficking regulator with GTP-state-dependent activity.","evidence":"Wild-type, dominant-negative, and constitutively active mutant expression in polarized MDCK cells with quantitative IgA transcytosis and transferrin recycling assays","pmids":["9880326","10869360"],"confidence":"High","gaps":["Effectors mediating apical selectivity not yet identified","Cargo beyond IgA not surveyed"]},{"year":2004,"claim":"Connected RAB25 to cancer phenotypes by showing forced expression drives proliferation, resists anoikis, and activates PI3K/AKT while lowering BAK/BAX, recasting a trafficking GTPase as an oncogenic survival factor.","evidence":"Forced expression, soft agar and in vivo tumor assays, BAK/BAX Western blots, PI3K/AKT pathway analysis in ovarian and breast models","pmids":["15502842"],"confidence":"High","gaps":["Direct molecular link between RAB25 trafficking and AKT activation not resolved here","Mechanism of BAK/BAX downregulation unclear"]},{"year":2007,"claim":"Defined the molecular basis of RAB25-driven invasion by showing it directly binds the β1 integrin tail and positions α5β1-recycling vesicles at pseudopodial tips, linking trafficking to fibronectin-dependent migration.","evidence":"Co-IP, live-cell vesicle imaging, 3D fibronectin invasion assays, and interaction mutants","pmids":["17925226"],"confidence":"High","gaps":["Whether binding is direct GTP-dependent contact not fully dissected","Other integrin cargo not addressed"]},{"year":2010,"claim":"Revealed the context-dependence of RAB25 by establishing it as a tumor suppressor in intestinal neoplasia, showing its loss increases polyp/tumor burden and reduces β1 integrin at lateral membranes—opposite to its oncogenic role elsewhere.","evidence":"Rab25 knockout mice on ApcMin/+ and Smad3+/- backgrounds, tumor counting, β1 integrin IHC; separately, CRE/CREB promoter mapping by EMSA/ChIP","pmids":["20197623","21075212"],"confidence":"High","gaps":["Molecular determinant of tissue-specific oncogenic vs suppressive switch unknown","Link between integrin mislocalization and tumor suppression mechanistic detail incomplete"]},{"year":2011,"claim":"Extended the integrin-trafficking model by showing RAB25 sorts active α5β1 to late endosomes for CLIC3-dependent retrograde recycling at the cell rear, and demonstrated transformation requires microtubule-dependent trafficking.","evidence":"Photoactivation microscopy, biochemical fractionation, CLIC3 knockdown/rescue, 3D/organotypic invasion; RIE-cell transformation with microtubule inhibitors","pmids":["22197222","21246754"],"confidence":"High","gaps":["How RAB25 diverts integrin from degradation to recycling not fully resolved","CLIC3 regulation by RAB25 only correlative on expression"]},{"year":2012,"claim":"Broadened RAB25 function to metabolism, junction biology, and additional cancer contexts—it binds/activates AKT to boost glycolysis and glycogen, is a Grhl2 target promoting claudin-4 junctions, and suppresses ESCC invasion via FAK-ERK signaling.","evidence":"AKT binding and metabolic flux assays; Grhl2 transfection and 3D cyst cultures; lentiviral gain/loss with FAK-Raf-MEK-ERK readouts and promoter methylation analysis","pmids":["22253197","22696678","22991305"],"confidence":"Medium","gaps":["Whether AKT binding is direct or trafficking-mediated unresolved","Mechanism connecting RAB25 to claudin levels unclear"]},{"year":2013,"claim":"Provided structural and mechanistic depth: solved the RAB25-FIP2 complex, mapped RAB25 control of integrin expression via ETV4, and added OPG secretion and F-actin/metastasis roles, consolidating the effector and cargo network.","evidence":"Crystal structure plus ITC; shRNA knockdown/rescue with ETV4 epistasis in Caco2-BBE; OPG ELISA with EGFR/MAPK inhibition; HNSCC re-expression with intravital imaging and metastasis scoring","pmids":["24056041","23345591","25520884","23340300"],"confidence":"High","gaps":["How FIP2 binding translates to specific cargo routing not directly tested","ETV4 regulation by RAB25 mechanism unclear"]},{"year":2016,"claim":"Showed RAB25 controls surface levels of signaling receptors and channels and engages stress pathways—stabilizing HIF-1α via ErbB2/mTOR, controlling CaV1.2 in arterial myocytes, and driving autophagic lipid-droplet turnover with PI3KCIII.","evidence":"HIF-1α protein/pathway inhibitor analysis with in vivo cisplatin models; immunoFRET, biotinylation, patch-clamp and myography for CaV1.2; Co-IP and ROS/autophagy assays in hepatic stellate cells","pmids":["26967059","27076616","28038427"],"confidence":"Medium","gaps":["Whether RAB25 directly traffics CaV1.2 or acts indirectly not fully distinguished","RAB25-PI3KCIII binding only by Co-IP"]},{"year":2017,"claim":"Validated the RAB25:FIP interface as a druggable, phenotype-determining interaction by showing stapled peptides disrupt the complex and produce context-specific outcomes consistent with RAB25's dual oncogenic/suppressive behavior.","evidence":"All-hydrocarbon stapled peptide (RFP14) with binding, complex-inhibition, permeability, and migration/proliferation assays plus transcriptional profiling","pmids":["28939823"],"confidence":"High","gaps":["In vivo efficacy not established","Full downstream consequences of FIP displacement not mapped"]},{"year":2018,"claim":"Resolved transcriptional and downstream signaling control: ZEB2 epigenetically represses RAB25, while RAB25 elevates β1 integrin/EGFR/VEGF-A to drive Snail-fascin-dependent EMT and metastasis.","evidence":"ChIP, bisulfite sequencing, H3K9Ac ChIP and SIRT1/DNMT inhibition for ZEB2 repression; pathway Westerns, Snail knockdown epistasis, and in vivo lung metastasis for the EMT axis","pmids":["30445998","29371698"],"confidence":"Medium","gaps":["Reconciliation of EMT-promoting vs claudin-stabilizing roles unresolved","Direct vs indirect VEGF-A induction unclear"]},{"year":2019,"claim":"Reinforced both oncogenic signaling and tumor-suppressive integrin trafficking arms—RAB25-β1 integrin-AKT-Wnt drives NSCLC proliferation and erlotinib resistance, while RAB25 loss dysregulates integrin recycling to promote skin SCC.","evidence":"Co-IP, fractionation, lentiviral gain/loss and xenografts in NSCLC; Rab25 KO two-stage skin carcinogenesis with integrin trafficking readouts","pmids":["30848009","31144312"],"confidence":"Medium","gaps":["Tissue determinant of opposite integrin outcomes not identified","β1-integrin-to-Wnt mechanistic link incomplete"]},{"year":2020,"claim":"Connected RAB25 receptor recycling to therapy resistance and confirmed an apoptosis-suppressing role upstream of mitochondrial permeabilization, identifying actionable vulnerabilities.","evidence":"Co-IP and EGFR recycling/degradation with radiosensitivity assays; BH3 profiling, BCL-2 family Westerns, and RNAi/RFP14 chemosensitization in ovarian cancer","pmids":["32252020","32901335"],"confidence":"Medium","gaps":["Direct biochemical target among BCL-2 proteins not pinpointed","EGFR recycling step regulated by RAB25 not structurally defined"]},{"year":2021,"claim":"Demonstrated a developmental morphogenetic role—RAB25 coordinates cytokinetic abscission and actomyosin-dependent cell rearrangement during epithelial epiboly—and added a PKM2-glycolysis arm in gastric cancer.","evidence":"Maternal-zygotic rab25a/b mutant zebrafish with live imaging and tissue mechanics; Co-IP/colocalization and PKM2-Y105 phosphorylation in gastric adenocarcinoma","pmids":["33755014","35116410"],"confidence":"High","gaps":["Effectors linking RAB25 to midbody abscission unidentified","How RAB25 promotes PKM2 phosphorylation mechanistically unclear"]},{"year":2023,"claim":"Refined the tumor-suppressive mechanism in colon cancer, showing RAB25 stabilizes claudin-7 to inactivate EGFR and reduce Snail, integrating junction control with receptor signaling.","evidence":"RAB25 overexpression, claudin-7 knockdown epistasis, 3D invasion assays, and claudin-7 protein-stability assays","pmids":["38131227"],"confidence":"Medium","gaps":["Mechanism of claudin-7 stabilization not defined","Relation to EMT-promoting role in other tissues unresolved"]},{"year":2025,"claim":"Expanded RAB25 mechanisms into ER-localized stress signaling, secreted protease induction, and lineage control—stabilizing GCN1 to drive ATF4 ER stress in liver, inducing ADAMTS5 via NF-κB to promote ovarian invasion, and restraining TGF-α/EGFR-driven gastric pit lineage commitment.","evidence":"MS/Co-IP and K33-ubiquitination/GCN2-ATF4 assays in ALD; NF-κB reporter and ADAMTS5 rescue in ovarian 3D invasion; Rab25 KO mice with single-cell RNA-seq and TGF-α neutralization","pmids":["40916695","40164572","41365858"],"confidence":"Medium","gaps":["ER-localized vs endosomal RAB25 pool regulation unclear","How RAB25 shields GCN1 from ubiquitination mechanistically undefined"]},{"year":null,"claim":"What single molecular determinant switches RAB25 between oncogenic and tumor-suppressive behavior across epithelia, and how its GTP-cycling state selects among the many cargoes (integrins, EGFR, CaV1.2, claudins) and effectors (FIP2, CLIC3, AKT, GCN1) it engages, remains unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No unifying model for context-dependent oncogenic/suppressive duality","GEF/GAP regulators of RAB25 not identified in the corpus","Cargo-selection rules among competing effectors undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003924","term_label":"GTPase activity","supporting_discovery_ids":[0,2,34]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[4,11,6]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[8,17,23]}],"localization":[{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[1,6,11]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[1,4,32]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[17,26]},{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[30]},{"term_id":"GO:0005764","term_label":"lysosome","supporting_discovery_ids":[6,17]}],"pathway":[{"term_id":"R-HSA-9609507","term_label":"Protein localization","supporting_discovery_ids":[1,2,4,23]},{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[1,4,6,25]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[3,5,10,22]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[8,20,21,23]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[3,24]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[16]}],"complexes":["Rab25-(FIP2)2-Rab25 heterotetramer"],"partners":["ITGB1","RAB11FIP2","AKT1","EGFR","CLIC3","PKM2","GCN1","PIK3C3"],"other_free_text":[]}},"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 gastrointestinal mucosa, lung, and kidney, with enrichment in parietal cells.\",\n      \"method\": \"3'-RACE cloning, GTP-binding blot assay, Northern blot\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — direct in vitro GTP-binding assay established biochemical activity; single lab, single paper\",\n      \"pmids\": [\"8360141\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Rab25 localizes to subapical vesicles and colocalizes with Rab11a in the apical recycling endosome of polarized MDCK cells. Overexpression of Rab25 decreased the rate of IgA transcytosis and of apical (but not basolateral) recycling. The dominant-negative Rab25T26N did not alter apical recycling or transcytosis.\",\n      \"method\": \"Transfection in MDCK cells, immunofluorescence colocalization, quantitative transcytosis/recycling assays, dominant-negative and wild-type constructs\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal functional assays with wild-type and dominant-negative constructs, selective apical vs. basolateral pathway dissection, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"9880326\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Using inducible expression of wild-type, dominant-negative, and constitutively active mutants, both Rab25 wild-type (S21V) and the constitutively active mutant inhibited apical IgA recycling and transcytosis by >50% but had no effect on basolateral transferrin recycling. The GTPase-deficient Rab11aS20V inhibited basolateral-to-apical transcytosis but not recycling, establishing distinct roles for GTP-binding state in apical trafficking.\",\n      \"method\": \"Inducible expression of wild-type, dominant-negative (Rab25S21V), and constitutively active mutants in MDCK cells; quantitative IgA transcytosis and transferrin recycling assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — multiple mutant constructs with quantitative trafficking assays, selective pathway dissection with multiple orthogonal measurements in one rigorous study\",\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, and increased tumor aggressiveness in vivo. The inhibition of apoptosis was associated with decreased expression of proapoptotic BAK and BAX, and activation of the PI3K/AKT pathway.\",\n      \"method\": \"Transfection/forced expression, soft agar assays, in vivo tumor growth, Western blot for BAK/BAX, PI3K/AKT pathway analysis\",\n      \"journal\": \"Nature medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple functional assays (proliferation, anoikis, in vivo), pathway analysis with molecular readouts, replicated across ovarian and breast cancer models\",\n      \"pmids\": [\"15502842\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Rab25 directly interacts with the β1 integrin cytoplasmic tail and promotes localization of integrin-recycling vesicles to pseudopodial tips, retaining a pool of cycling α5β1 integrin at the cell front. Rab25-driven tumor-cell invasion into 3D extracellular matrix is strongly dependent on fibronectin ligation by α5β1 and requires Rab25's capacity to interact with β1 integrin.\",\n      \"method\": \"Co-immunoprecipitation (direct interaction), live-cell imaging of vesicle localization, 3D invasion assays on fibronectin matrices, domain-interaction mutants\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct binding shown by Co-IP, functional 3D invasion assay with fibronectin-dependence, mutant constructs, multiple orthogonal methods in single study\",\n      \"pmids\": [\"17925226\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Rab25-deficient mice crossed onto ApcMin/+ background showed a 4-fold increase in intestinal polyps and 2-fold increase in colonic tumors compared to parental ApcMin/+ mice, establishing Rab25 as a tumor suppressor in intestinal neoplasia. Rab25-deficient mice also showed decreased β1 integrin staining in lateral membranes of villus cells. Similarly, Rab25-deficient mice crossed with Smad3+/- mice showed markedly increased colonic tumor formation.\",\n      \"method\": \"Rab25 knockout mice, genetic epistasis (ApcMin/+, Smad3+/- crosses), immunohistochemistry for β1 integrin, tumor counting\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis with two independent cancer-prone mouse models, in vivo tumor quantification, pathway-specific readout (β1 integrin trafficking)\",\n      \"pmids\": [\"20197623\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Rab25 permits sorting of ligand-occupied, active-conformation α5β1 integrin to late endosomes/lysosomes. Lysosomally targeted integrins are not degraded but are retrogradely transported and recycled to the plasma membrane at the back of invading cells. This requires CLIC3, a protein upregulated in Rab25-expressing cells, which colocalizes with active α5β1 in late endosomes/lysosomes and is necessary for cell rear release during migration.\",\n      \"method\": \"Photoactivation microscopy, biochemical fractionation, CLIC3 knockdown/overexpression, 3D invasion assays, organotypic cultures, Src signaling assays\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — photoactivation and biochemical approaches are orthogonal methods; functional rescue experiments; identification of CLIC3 as required effector; single lab but multiple rigorous methods\",\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 caused morphological transformation, growth in soft agar, and tumor formation in nude mice. This transformation was reversed by inhibitors of microtubule polymerization but not by H-Ras(V12)-induced transformation, establishing microtubule-dependent trafficking as the mechanism of Rab25-driven transformation.\",\n      \"method\": \"Stable overexpression in RIE cells, soft agar assays, nude mouse tumorigenesis, microtubule inhibitor treatment, comparison with H-Ras(V12) transformation\",\n      \"journal\": \"Cytoskeleton (Hoboken, N.J.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro and in vivo transformation assays with specific pharmacological dissection of mechanism; single lab, multiple assays\",\n      \"pmids\": [\"21246754\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"RAB25 enhanced cancer cell survival during nutrient stress by binding and activating AKT, leading to increased glucose uptake, improved cellular bioenergetics, and unexpected accumulation of glycogen in epithelial cancer cells. AKT-dependent increases in glucose uptake and glycogen storage maintained ATP levels during bioenergetic stress.\",\n      \"method\": \"RAB25 overexpression/knockdown, AKT binding assays, glucose uptake assays, ATP/glycogen quantification, extracellular flux analysis, apoptosis assays under nutrient stress\",\n      \"journal\": \"EMBO molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct AKT binding, metabolic flux measurements; single lab with multiple orthogonal metabolic methods\",\n      \"pmids\": [\"22253197\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Grhl2 transcriptionally upregulates Rab25 as one of its targets. Rab25 increases claudin-4 protein levels and enhances its localization to tight junctions, contributing to epithelial lumen formation and cyst expansion in 3D cultures.\",\n      \"method\": \"Grhl2 cDNA transfection, 3D cyst cultures, claudin localization by immunofluorescence, rescue/overexpression experiments\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional rescue and epistasis in 3D cultures, direct transcriptional target identification; single lab, multiple functional readouts\",\n      \"pmids\": [\"22696678\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Rab25 acts as a tumor suppressor in esophageal squamous cell carcinoma (ESCC); functional studies showed Rab25 re-expression suppresses invasion and angiogenesis through a deregulated FAK-Raf-MEK1/2-ERK signaling pathway. Downregulation of Rab25 in ESCC was associated with promoter hypermethylation.\",\n      \"method\": \"Lentiviral overexpression and suppression, invasion assays, angiogenesis assays, Western blot for FAK-Raf-MEK1/2-ERK pathway, bisulfite sequencing and demethylation treatment\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain- and loss-of-function with pathway-specific readouts; single lab with multiple orthogonal methods\",\n      \"pmids\": [\"22991305\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Crystal structure of Rab25 in complex with the C-terminal region of FIP2 was determined. Rab25 associates with FIP2 and recruits this effector to endosomal membranes. The structure reveals a heterotetrameric Rab25-(FIP2)2-Rab25 complex. FIP2 binds Rab25 with approximately 3-fold weaker affinity than Rab11a, with reduced enthalpy attributable to differences in switch 1 and switch 2 conformations.\",\n      \"method\": \"Crystal structure determination, isothermal titration calorimetry (ITC), co-localization by immunofluorescence, thermodynamic analysis\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure with thermodynamic validation and cellular colocalization; single lab but multiple orthogonal methods (structure + ITC + cell biology)\",\n      \"pmids\": [\"24056041\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Rab25 directly associates with α5β1 integrins (colocalization and direct association shown) and controls integrin expression in polarized Caco2-BBE cells. Rab25 knockdown decreased α2-, α5-, and β1-integrin expression and upregulated claudin-1 expression, increased transepithelial resistance, and increased invasive behavior. Rab25 loss also decreased the transcription factor ETV4, and ETV4 overexpression in Rab25-knockdown cells reversed losses of α5β1-integrin.\",\n      \"method\": \"Stable shRNA knockdown, rescue by rabbit Rab25 re-expression, Co-IP/colocalization for direct association, gene expression arrays, transepithelial resistance measurement, invasion assays, ETV4 overexpression epistasis\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct interaction shown, rescue experiment, epistasis with ETV4, multiple orthogonal assays; single lab but comprehensive mechanistic dissection\",\n      \"pmids\": [\"23345591\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Rab25 mediates secretion of osteoprotegerin (OPG), both at the transcription and secretion level. RAB25 expression increased OPG mRNA expression and secretion from ovarian and breast cancer cell lines, protecting cells from TRAIL-induced cell death. Rab25 cooperates with EGFR-mediated MAPK signaling to increase OPG production and release.\",\n      \"method\": \"Rab25 overexpression/siRNA knockdown, OPG ELISA, mRNA quantification, cell death assays, pharmacogenetic pathway inhibition\",\n      \"journal\": \"Journal of genetic syndromes & gene therapy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain- and loss-of-function with secretion assays and pathway inhibition; single lab, multiple assays but lower-tier journal\",\n      \"pmids\": [\"25520884\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Rab25 affects the organization of F-actin at the cell surface in head and neck squamous cell carcinoma (HNSCC). Re-expression of Rab25 in a metastatic HNSCC cell line blocked invasion in 3D collagen matrix and blocked metastasis to cervical lymph nodes in a mouse oral cancer model.\",\n      \"method\": \"Rab25 re-expression, intravital microscopy, 3D invasion assay, mouse model of oral cancer with lymph node metastasis quantification, F-actin staining\",\n      \"journal\": \"Clinical cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo metastasis model combined with cellular F-actin phenotype; single lab with in vitro and in vivo orthogonal approaches\",\n      \"pmids\": [\"23340300\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Rab25 regulates HIF-1α protein expression in an oxygen-independent manner in cancer cells, requiring de novo protein synthesis through the Erbb2/ERK1/2 and p70S6K/mTOR pathways (not transcriptional upregulation). Rab25 expression induced HIF-1 transcriptional activity, increased cisplatin resistance, and conferred intraperitoneal growth in vivo. Targeting HIF-1β re-sensitized Rab25-expressing cells to cisplatin.\",\n      \"method\": \"HIF-1α protein/mRNA analysis, pathway inhibitors (Erbb2/ERK1/2, mTOR), HIF-1β siRNA knockdown, in vivo peritoneal carcinomatosis model, MTT assays\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pathway dissection by multiple inhibitors, in vitro and in vivo validation; single lab\",\n      \"pmids\": [\"26967059\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Rab25 promotes turnover of lipid droplets in hepatic stellate cells (HSCs) through ROS-dependent mechanisms. HSC activation triggers Rab25 overexpression, and Rab25 promotes combination with PI3KCIII to direct autophagy to recognize and degrade lipid droplets. Rab25 siRNA blocked autophagy-mediated lipid droplet disappearance; ROS scavenging disrupted Rab25-autophagy interaction.\",\n      \"method\": \"Rab25 siRNA knockdown, Atg5 siRNA, autophagosome assays, Co-IP of Rab25 and PI3KCIII, antioxidant treatment, lipid droplet quantification\",\n      \"journal\": \"Redox biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP of Rab25-PI3KCIII, functional knockdown assays; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"28038427\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Rab25 controls surface expression of CaV1.2 calcium channels in cerebral artery smooth muscle cells. Rab25 localizes in close spatial proximity to CaV1.2 (by immunoFRET); Rab25 knockdown reduced CaV1.2 surface and intracellular abundance, reduced whole-cell CaV1.2 current density, and inhibited pressure- and depolarization-induced vasoconstriction. CaV1.2 degradation upon Rab25 knockdown involved both lysosomal and proteasomal pathways.\",\n      \"method\": \"Immunofluorescence FRET (immunoFRET), siRNA knockdown, arterial biotinylation surface expression assay, patch-clamp electrophysiology, pressure myography\",\n      \"journal\": \"American journal of physiology. Cell physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — proximity measured by FRET, surface expression by biotinylation, electrophysiology, and vasoconstriction assay; multiple orthogonal methods in a single rigorous study\",\n      \"pmids\": [\"27076616\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Stapled peptides derived from the RAB-binding FIP-family protein (RFP14) target RAB25 and inhibit RAB25:FIP complex formation in cells. Treatment with RFP14 inhibits migration and proliferation in a RAB25-dependent manner in pro-oncogenic contexts, and augments these phenotypes in tumor suppressive contexts, validating context-specific RAB25 oncogenic phenotypes.\",\n      \"method\": \"All-hydrocarbon stapled peptides, cell permeability assays, binding affinity measurements, RAB25:FIP complex inhibition, migration/proliferation assays, transcriptional profiling\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — reconstituted inhibition of RAB25:FIP complex with chemical probe showing RAB25-dependent phenotypes; multiple orthogonal methods, single lab\",\n      \"pmids\": [\"28939823\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"ZEB2 transcriptionally represses RAB25 by binding specifically to E-box sequences on the RAB25 promoter. ZEB2 binding is associated with local increases in DNA methylation (requiring DNMTs) and histone deacetylation (H3K9Ac) depending on SIRT1 activity. RAB25 contributes to partial suppression of ZEB2-mediated cell migration.\",\n      \"method\": \"Conditional ZEB2 expression, ChIP for ZEB2 at RAB25 promoter E-boxes, bisulfite sequencing for DNA methylation, H3K9Ac ChIP, SIRT1 inhibition, DNMT inhibition, migration assays\",\n      \"journal\": \"Epigenetics & chromatin\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP for direct promoter binding, epigenetic marks measured by multiple methods; single lab\",\n      \"pmids\": [\"30445998\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Rab25 increases β1 integrin levels and subsequent EGFR activation, upregulating VEGF-A expression and leading to increased Snail expression, EMT, and cancer cell invasiveness. Snail mediates Rab25-induced invasiveness through fascin expression. Ectopic Rab25 expression promotes metastasis of ovarian cancer cells to the lung in vivo.\",\n      \"method\": \"Rab25 overexpression, Western blot for pathway components (β1 integrin, EGFR, VEGF-A, Snail, fascin), Snail knockdown epistasis, in vivo lung metastasis model\",\n      \"journal\": \"Experimental & molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — epistasis with Snail knockdown establishes pathway order; in vivo metastasis assay; single lab\",\n      \"pmids\": [\"29371698\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Rab25 interacts with β1 integrin (shown by Co-IP) and promotes trafficking of β1 integrin to the cytoplasmic membrane. Membrane-localized β1 integrin induces AKT phosphorylation and subsequently activates the Wnt/β-catenin signaling pathway, promoting cell proliferation and mediating erlotinib resistance in NSCLC.\",\n      \"method\": \"Co-immunoprecipitation, Western blot, cell fractionation, lentiviral Rab25 knockin/knockout, cell proliferation and apoptosis assays, in vivo xenograft\",\n      \"journal\": \"Cell proliferation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP for direct interaction, mechanistic pathway validated by in vitro and in vivo experiments; single lab\",\n      \"pmids\": [\"30848009\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Loss of Rab25 promotes skin squamous cell carcinoma (SCC) development through dysregulation of integrin β1, β4, and α6 trafficking and expression. Rab25 deficiency caused impairment of integrin recycling, and Rab25 knockout mice showed accelerated tumor generation and malignant transformation in a two-stage skin carcinogenesis model.\",\n      \"method\": \"Rab25 knockout mice, two-stage skin carcinogenesis model, Rab25-deficient keratinocyte xenografts, integrin trafficking assays, immunohistochemistry\",\n      \"journal\": \"The Journal of pathology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo genetic model with specific integrin trafficking readout, xenograft confirmation; single lab\",\n      \"pmids\": [\"31144312\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Rab25 interacts with EGFR (Co-IP) to enhance EGFR recycling to the cell surface and decrease EGFR degradation in the cytoplasm. This promotes hyperactive EGFR signaling and tumor radioresistance. Inhibition of Rab25 showed synergized radiosensitivity.\",\n      \"method\": \"Co-immunoprecipitation for Rab25-EGFR interaction, surface EGFR quantification, EGFR recycling/degradation assays, radiosensitivity assays\",\n      \"journal\": \"iScience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP establishes direct interaction, trafficking assays demonstrate functional consequence; single lab\",\n      \"pmids\": [\"32252020\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"RAB25 suppresses chemotherapy-induced mitochondrial apoptosis in ovarian cancer cells upstream of mitochondrial outer membrane permeabilization, either by increasing antiapoptotic BCL-2 proteins or decreasing proapoptotic BCL-2 proteins. BAX expression negatively correlates with RAB25 expression. BH3 profiling confirmed RAB25 decreases mitochondrial cell death priming. Suppressing RAB25 by RNAi or stapled peptide RFP14 sensitizes cells to chemotherapy.\",\n      \"method\": \"RAB25 siRNA knockdown, RFP14 stapled peptide inhibition, BH3 profiling, Western blot for BCL-2 family members, chemotherapy sensitivity assays\",\n      \"journal\": \"Apoptosis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — BH3 profiling as functional mitochondrial assay plus genetic and chemical knockdown, multiple BCL-2 family readouts; single lab\",\n      \"pmids\": [\"32901335\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Rab25 localizes near cytokinetic midbodies in zebrafish gastrula epithelium and coordinates cytokinetic bridge abscission through endomembrane trafficking. Loss of Rab25a and Rab25b caused persistent apical cytokinetic bridges, anisotropic cell morphologies, reduced contractile actomyosin networks, slowed cell rearrangements, and altered viscoelastic tissue responses, all contributing to delayed epiboly.\",\n      \"method\": \"Maternal-zygotic Rab25a and Rab25b mutant zebrafish, live imaging, immunofluorescence for midbody localization, actomyosin quantification, tissue mechanics measurement\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct localization to midbodies, genetic loss-of-function with specific cytokinesis phenotype, tissue mechanics readout, two orthologous genes tested; rigorous in vivo developmental study\",\n      \"pmids\": [\"33755014\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Rab25 participates in regulation of aerobic glycolysis via PKM2 in gastric adenocarcinoma. Rab25 protein and PKM2 protein co-localize on the cell membrane and directly bind each other. Rab25 is a positive regulator of PKM2 and promotes phosphorylation of PKM2 at Y105.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence colocalization, lentiviral Rab25 silencing/overexpression, pyruvate/lactate quantification, PKM2 phosphorylation by Western blot\",\n      \"journal\": \"Translational cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and colocalization establish direct binding, phosphorylation assay provides mechanistic readout; single lab\",\n      \"pmids\": [\"35116410\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"RAB25 coordinates keratohyalin granule (KHG) maturation by regulating actin dynamics in keratinocytes. RAB25-deficient mice showed decreased KHG production and abnormal KHG processing. In HaCaT cells, RAB25 co-expressed with filaggrin-containing KHG, and RAB25 silencing impaired KHG formation through abnormal actin dynamics.\",\n      \"method\": \"Rab25 knockout mice, oxazolone AD model, RAB25 siRNA in HaCaT cells, immunofluorescence, KHG quantification, actin dynamics assays\",\n      \"journal\": \"Allergy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo KO model with in vitro mechanistic follow-up linking RAB25 to actin regulation; single lab\",\n      \"pmids\": [\"36383036\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Rab25 induces claudin-7 expression through protein stabilization in colon cancer cells. Claudin-7 inactivates EGFR and reduces Snail expression; silencing claudin-7 reversed the tumor-suppressive role of Rab25. Rab25 also inactivated EGFR and increased E-cadherin expression.\",\n      \"method\": \"Rab25 overexpression, claudin-7 knockdown epistasis, 3D Matrigel invasion assay, modified Boyden chamber, Western blot for EGFR/E-cadherin/Snail, claudin-7 protein stability assay\",\n      \"journal\": \"Oncology reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — epistasis with claudin-7 knockdown establishes pathway order, protein stability assay identifies mechanism; single lab\",\n      \"pmids\": [\"38131227\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"RAB25 promotes ADAMTS5 expression through activation of the NF-κB signaling pathway in ovarian cancer cells. ADAMTS5 is necessary and sufficient to stimulate ovarian cancer cell migration through fibroblast-secreted matrices, and selective ADAMTS5 inhibition prevented ovarian cancer spheroid invasion in 3D systems.\",\n      \"method\": \"Rab25 overexpression/knockdown, NF-κB pathway inhibition and reporter assay, ADAMTS5 knockdown/overexpression, 3D invasion spheroid assays\",\n      \"journal\": \"The FEBS journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — NF-κB pathway mechanistically linked to ADAMTS5 induction, functional 3D invasion rescue experiments; single lab\",\n      \"pmids\": [\"40164572\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"RAB25 interacts with GCN1 (confirmed by mass spectrometry and Co-IP), and this interaction inhibits K33-ubiquitination-mediated degradation of GCN1, promoting GCN2 phosphorylation and subsequently activating ATF4-mediated ER stress in hepatocytes during alcohol-associated liver disease. RAB25 specifically accumulates on the ER in ALD.\",\n      \"method\": \"Mass spectrometry, Co-immunoprecipitation, K33-ubiquitination assays, GCN2 phosphorylation, ATF4/ER stress markers, RAB25 knockdown in vitro and in vivo\",\n      \"journal\": \"Clinical and molecular hepatology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct interaction confirmed by MS and Co-IP, mechanistic pathway delineated by ubiquitination and phosphorylation assays; single lab\",\n      \"pmids\": [\"40916695\"],\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 the pit region and drives pit cell lineage commitment. Long-term alteration of TGF-α secretion in Rab25 KO mice caused gastric lesions with massive foveolar hyperplasia, which was ameliorated by TGF-α neutralization.\",\n      \"method\": \"Rab25 KO mice, mouse primary cell culture, single-cell RNA sequencing, TGF-α neutralization in vivo, EGFR pathway analysis by Western blot\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO with specific ligand neutralization rescue establishes TGF-α as the mechanistic link; single lab\",\n      \"pmids\": [\"41365858\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Magnetogenetic positioning of Rab25 vesicles to the cell periphery directly drives formation of F-actin protrusions. Endogenous Rab25 vesicles coordinate positioning of actin regulator FMNL1 and integrin β1 with activation of Rho GTPases at the plasma membrane to generate and maintain F-actin rich filopodial protrusions and promote cancer cell invasive migration in 3D matrix.\",\n      \"method\": \"Magnetogenetic approach for direct Rab25 vesicle positioning, live-cell imaging, F-actin quantification, FMNL1 and integrin β1 colocalization, Rho GTPase biosensor\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct causal manipulation (magnetogenetics) establishes Rab25 vesicle positioning drives protrusion; preprint, not yet peer-reviewed\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"The RAB25 promoter contains a CRE element (-67/-58) that binds CREB within the core promoter region. PKA activator forskolin enhances open chromatin accessibility at this CRE, facilitating CREB phosphorylation, recruitment of co-factors CBP and Brg1, histone modification, and heightened RAB25 expression.\",\n      \"method\": \"PCR-based chromatin accessibility assay, ChIP, EMSA, deletion constructs with luciferase reporter, forskolin treatment\",\n      \"journal\": \"The international journal of biochemistry & cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — EMSA and ChIP establish direct CREB binding, deletion constructs map core promoter element; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"21075212\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"CCN3 overexpression in cortical neurons inhibits axonal outgrowth, with RAB25 identified as a downstream effector by transcriptomic analysis. In vivo ectopic expression of RAB25 or dominant-negative RAB25-T26N demonstrated that GTPase activity of RAB25 is required for CCN3-mediated inhibition of neuronal outgrowth.\",\n      \"method\": \"In vivo cortical electroporation, transcriptomic analysis, RAB25 and dominant-negative RAB25-T26N overexpression, axonal outgrowth quantification\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — epistasis established by in vivo electroporation but mechanism is not molecularly resolved beyond GTPase activity requirement; single lab, single publication\",\n      \"pmids\": [\"25871796\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"RAB25 is an epithelial-specific Rab11-subfamily small GTPase that cycles on apical recycling endosomes to regulate selective apical membrane recycling and transcytosis (but not basolateral recycling), directly binds effectors including β1 integrin cytoplasmic tail and FIP2 (crystal structure solved), promotes delivery of recycling vesicles carrying α5β1 integrin and actin regulators (FMNL1) to cell protrusions to drive invasion, activates AKT to enhance bioenergetics and glycogen storage, controls EGFR surface recycling, regulates CaV1.2 channel surface abundance in smooth muscle, coordinates cytokinetic abscission via endomembrane trafficking in epithelia, and modulates apoptosis by suppressing proapoptotic BCL-2 family members (BAX/BAK), with its oncogenic or tumor-suppressive behavior being highly context-dependent across cancer types.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"RAB25 is an epithelial-enriched Rab11-subfamily small GTP-binding protein that governs selective apical membrane recycling and the trafficking of cargo to and from the cell surface [#0, #1]. It localizes to subapical recycling endosomes where it colocalizes with Rab11a and, in a GTP-state-dependent manner, restrains apical IgA recycling and basolateral-to-apical transcytosis without affecting basolateral recycling [#1, #2]. Mechanistically, RAB25 binds the FIP2 effector—captured in a heterotetrameric Rab25-(FIP2)2-Rab25 crystal structure—and recruits it to endosomal membranes [#11], and it directly engages the β1 integrin cytoplasmic tail to position α5β1-integrin-bearing recycling vesicles at invasive cell protrusions, driving fibronectin-dependent 3D invasion [#4]. RAB25 coordinates actin-rich protrusion formation by directing FMNL1 and β1 integrin to the periphery alongside Rho GTPase activation [#32], and routes active integrin through CLIC3-dependent late-endosomal recycling for cell-rear release during migration [#6]. Beyond trafficking, RAB25 binds and activates AKT to enhance glucose uptake and glycogen storage during nutrient stress [#8] and suppresses mitochondrial apoptosis by lowering proapoptotic BAX/BAK priming [#3, #24]. It controls surface abundance of receptors and channels including EGFR [#23] and CaV1.2 in smooth muscle [#17], and coordinates cytokinetic abscission via endomembrane trafficking during epithelial morphogenesis [#25]. RAB25's role in cancer is sharply context-dependent: it acts as an oncogene promoting integrin- and EGFR-driven invasion and metastasis in some tissues [#4, #20], yet behaves as a tumor suppressor in intestinal, esophageal, and skin epithelia, where its loss accelerates tumorigenesis and impairs integrin trafficking [#5, #10, #22]. Its expression is set by transcriptional inputs including CREB [#33], Grhl2 [#9], and ZEB2-mediated epigenetic repression [#19].\",\n  \"teleology\": [\n    {\n      \"year\": 1993,\n      \"claim\": \"Established RAB25 as a bona fide GTP-binding protein and defined its restricted epithelial expression, framing it as a tissue-specific Rab GTPase rather than a ubiquitous trafficking factor.\",\n      \"evidence\": \"3'-RACE cloning, GTP-binding blot assay, and Northern blot across tissues\",\n      \"pmids\": [\"8360141\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No effector or subcellular compartment identified\", \"GTP hydrolysis/cycling kinetics not measured\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Localized RAB25 to apical recycling endosomes and showed it selectively regulates apical recycling and transcytosis but not basolateral recycling, establishing it as a polarity-specific trafficking regulator with GTP-state-dependent activity.\",\n      \"evidence\": \"Wild-type, dominant-negative, and constitutively active mutant expression in polarized MDCK cells with quantitative IgA transcytosis and transferrin recycling assays\",\n      \"pmids\": [\"9880326\", \"10869360\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Effectors mediating apical selectivity not yet identified\", \"Cargo beyond IgA not surveyed\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Connected RAB25 to cancer phenotypes by showing forced expression drives proliferation, resists anoikis, and activates PI3K/AKT while lowering BAK/BAX, recasting a trafficking GTPase as an oncogenic survival factor.\",\n      \"evidence\": \"Forced expression, soft agar and in vivo tumor assays, BAK/BAX Western blots, PI3K/AKT pathway analysis in ovarian and breast models\",\n      \"pmids\": [\"15502842\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct molecular link between RAB25 trafficking and AKT activation not resolved here\", \"Mechanism of BAK/BAX downregulation unclear\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Defined the molecular basis of RAB25-driven invasion by showing it directly binds the β1 integrin tail and positions α5β1-recycling vesicles at pseudopodial tips, linking trafficking to fibronectin-dependent migration.\",\n      \"evidence\": \"Co-IP, live-cell vesicle imaging, 3D fibronectin invasion assays, and interaction mutants\",\n      \"pmids\": [\"17925226\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether binding is direct GTP-dependent contact not fully dissected\", \"Other integrin cargo not addressed\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Revealed the context-dependence of RAB25 by establishing it as a tumor suppressor in intestinal neoplasia, showing its loss increases polyp/tumor burden and reduces β1 integrin at lateral membranes—opposite to its oncogenic role elsewhere.\",\n      \"evidence\": \"Rab25 knockout mice on ApcMin/+ and Smad3+/- backgrounds, tumor counting, β1 integrin IHC; separately, CRE/CREB promoter mapping by EMSA/ChIP\",\n      \"pmids\": [\"20197623\", \"21075212\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular determinant of tissue-specific oncogenic vs suppressive switch unknown\", \"Link between integrin mislocalization and tumor suppression mechanistic detail incomplete\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Extended the integrin-trafficking model by showing RAB25 sorts active α5β1 to late endosomes for CLIC3-dependent retrograde recycling at the cell rear, and demonstrated transformation requires microtubule-dependent trafficking.\",\n      \"evidence\": \"Photoactivation microscopy, biochemical fractionation, CLIC3 knockdown/rescue, 3D/organotypic invasion; RIE-cell transformation with microtubule inhibitors\",\n      \"pmids\": [\"22197222\", \"21246754\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How RAB25 diverts integrin from degradation to recycling not fully resolved\", \"CLIC3 regulation by RAB25 only correlative on expression\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Broadened RAB25 function to metabolism, junction biology, and additional cancer contexts—it binds/activates AKT to boost glycolysis and glycogen, is a Grhl2 target promoting claudin-4 junctions, and suppresses ESCC invasion via FAK-ERK signaling.\",\n      \"evidence\": \"AKT binding and metabolic flux assays; Grhl2 transfection and 3D cyst cultures; lentiviral gain/loss with FAK-Raf-MEK-ERK readouts and promoter methylation analysis\",\n      \"pmids\": [\"22253197\", \"22696678\", \"22991305\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether AKT binding is direct or trafficking-mediated unresolved\", \"Mechanism connecting RAB25 to claudin levels unclear\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Provided structural and mechanistic depth: solved the RAB25-FIP2 complex, mapped RAB25 control of integrin expression via ETV4, and added OPG secretion and F-actin/metastasis roles, consolidating the effector and cargo network.\",\n      \"evidence\": \"Crystal structure plus ITC; shRNA knockdown/rescue with ETV4 epistasis in Caco2-BBE; OPG ELISA with EGFR/MAPK inhibition; HNSCC re-expression with intravital imaging and metastasis scoring\",\n      \"pmids\": [\"24056041\", \"23345591\", \"25520884\", \"23340300\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How FIP2 binding translates to specific cargo routing not directly tested\", \"ETV4 regulation by RAB25 mechanism unclear\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Showed RAB25 controls surface levels of signaling receptors and channels and engages stress pathways—stabilizing HIF-1α via ErbB2/mTOR, controlling CaV1.2 in arterial myocytes, and driving autophagic lipid-droplet turnover with PI3KCIII.\",\n      \"evidence\": \"HIF-1α protein/pathway inhibitor analysis with in vivo cisplatin models; immunoFRET, biotinylation, patch-clamp and myography for CaV1.2; Co-IP and ROS/autophagy assays in hepatic stellate cells\",\n      \"pmids\": [\"26967059\", \"27076616\", \"28038427\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether RAB25 directly traffics CaV1.2 or acts indirectly not fully distinguished\", \"RAB25-PI3KCIII binding only by Co-IP\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Validated the RAB25:FIP interface as a druggable, phenotype-determining interaction by showing stapled peptides disrupt the complex and produce context-specific outcomes consistent with RAB25's dual oncogenic/suppressive behavior.\",\n      \"evidence\": \"All-hydrocarbon stapled peptide (RFP14) with binding, complex-inhibition, permeability, and migration/proliferation assays plus transcriptional profiling\",\n      \"pmids\": [\"28939823\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo efficacy not established\", \"Full downstream consequences of FIP displacement not mapped\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Resolved transcriptional and downstream signaling control: ZEB2 epigenetically represses RAB25, while RAB25 elevates β1 integrin/EGFR/VEGF-A to drive Snail-fascin-dependent EMT and metastasis.\",\n      \"evidence\": \"ChIP, bisulfite sequencing, H3K9Ac ChIP and SIRT1/DNMT inhibition for ZEB2 repression; pathway Westerns, Snail knockdown epistasis, and in vivo lung metastasis for the EMT axis\",\n      \"pmids\": [\"30445998\", \"29371698\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Reconciliation of EMT-promoting vs claudin-stabilizing roles unresolved\", \"Direct vs indirect VEGF-A induction unclear\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Reinforced both oncogenic signaling and tumor-suppressive integrin trafficking arms—RAB25-β1 integrin-AKT-Wnt drives NSCLC proliferation and erlotinib resistance, while RAB25 loss dysregulates integrin recycling to promote skin SCC.\",\n      \"evidence\": \"Co-IP, fractionation, lentiviral gain/loss and xenografts in NSCLC; Rab25 KO two-stage skin carcinogenesis with integrin trafficking readouts\",\n      \"pmids\": [\"30848009\", \"31144312\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Tissue determinant of opposite integrin outcomes not identified\", \"β1-integrin-to-Wnt mechanistic link incomplete\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Connected RAB25 receptor recycling to therapy resistance and confirmed an apoptosis-suppressing role upstream of mitochondrial permeabilization, identifying actionable vulnerabilities.\",\n      \"evidence\": \"Co-IP and EGFR recycling/degradation with radiosensitivity assays; BH3 profiling, BCL-2 family Westerns, and RNAi/RFP14 chemosensitization in ovarian cancer\",\n      \"pmids\": [\"32252020\", \"32901335\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct biochemical target among BCL-2 proteins not pinpointed\", \"EGFR recycling step regulated by RAB25 not structurally defined\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Demonstrated a developmental morphogenetic role—RAB25 coordinates cytokinetic abscission and actomyosin-dependent cell rearrangement during epithelial epiboly—and added a PKM2-glycolysis arm in gastric cancer.\",\n      \"evidence\": \"Maternal-zygotic rab25a/b mutant zebrafish with live imaging and tissue mechanics; Co-IP/colocalization and PKM2-Y105 phosphorylation in gastric adenocarcinoma\",\n      \"pmids\": [\"33755014\", \"35116410\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Effectors linking RAB25 to midbody abscission unidentified\", \"How RAB25 promotes PKM2 phosphorylation mechanistically unclear\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Refined the tumor-suppressive mechanism in colon cancer, showing RAB25 stabilizes claudin-7 to inactivate EGFR and reduce Snail, integrating junction control with receptor signaling.\",\n      \"evidence\": \"RAB25 overexpression, claudin-7 knockdown epistasis, 3D invasion assays, and claudin-7 protein-stability assays\",\n      \"pmids\": [\"38131227\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of claudin-7 stabilization not defined\", \"Relation to EMT-promoting role in other tissues unresolved\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Expanded RAB25 mechanisms into ER-localized stress signaling, secreted protease induction, and lineage control—stabilizing GCN1 to drive ATF4 ER stress in liver, inducing ADAMTS5 via NF-κB to promote ovarian invasion, and restraining TGF-α/EGFR-driven gastric pit lineage commitment.\",\n      \"evidence\": \"MS/Co-IP and K33-ubiquitination/GCN2-ATF4 assays in ALD; NF-κB reporter and ADAMTS5 rescue in ovarian 3D invasion; Rab25 KO mice with single-cell RNA-seq and TGF-α neutralization\",\n      \"pmids\": [\"40916695\", \"40164572\", \"41365858\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"ER-localized vs endosomal RAB25 pool regulation unclear\", \"How RAB25 shields GCN1 from ubiquitination mechanistically undefined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"What single molecular determinant switches RAB25 between oncogenic and tumor-suppressive behavior across epithelia, and how its GTP-cycling state selects among the many cargoes (integrins, EGFR, CaV1.2, claudins) and effectors (FIP2, CLIC3, AKT, GCN1) it engages, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No unifying model for context-dependent oncogenic/suppressive duality\", \"GEF/GAP regulators of RAB25 not identified in the corpus\", \"Cargo-selection rules among competing effectors undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003924\", \"supporting_discovery_ids\": [0, 2, 34]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [4, 11, 6]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [8, 17, 23]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [1, 6, 11]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [1, 4, 32]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [17, 26]},\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [30]},\n      {\"term_id\": \"GO:0005764\", \"supporting_discovery_ids\": [6, 17]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [1, 2, 4, 23]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [1, 4, 6, 25]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [3, 5, 10, 22]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [8, 20, 21, 23]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [3, 24]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [16]}\n    ],\n    \"complexes\": [\"Rab25-(FIP2)2-Rab25 heterotetramer\"],\n    \"partners\": [\"ITGB1\", \"RAB11FIP2\", \"AKT1\", \"EGFR\", \"CLIC3\", \"PKM2\", \"GCN1\", \"PIK3C3\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}