{"gene":"RAB7A","run_date":"2026-06-10T06:43:36","timeline":{"discoveries":[{"year":2000,"finding":"RAB7A (Rab7) controls aggregation and fusion of late endocytic structures/lysosomes and is essential for maintenance of the perinuclear lysosome compartment. Dominant-negative Rab7 mutants (T22N, N125I) caused lysosome dispersal, loss of acidification, and inaccessibility to endocytosed LDL, while constitutively active Rab7Q67L enhanced perinuclear lysosome aggregation and fusion.","method":"Transient expression of EGFP-tagged wild-type and mutant Rab7 in HeLa cells; colocalization with cathepsin D, LAMP1, LysoTracker Red, transferrin receptor, CI-M6PR, TGN-38","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean gain- and loss-of-function with multiple orthogonal readouts (lysosome morphology, acidity, cargo access), replicated across expression levels","pmids":["10679007"],"is_preprint":false},{"year":2003,"finding":"hVPS34 (class III PI3K) and its adaptor p150 are direct Rab7 interacting partners that colocalize on late endosomes; hVPS34 kinase activity is dependent on nucleotide cycling of Rab7, and Rab7 expression modulates total cellular PI(3)P levels.","method":"Co-immunoprecipitation, colocalization by fluorescence microscopy, PI3K activity assays with dominant-negative and constitutively active Rab7","journal":"Traffic (Copenhagen, Denmark)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP plus functional kinase assay, single lab","pmids":["14617358"],"is_preprint":false},{"year":2003,"finding":"Rab5 is required upstream of Rab7 recruitment to phagosomes; however, PI3K is required for Rab5 dissociation from phagosomes, and Rab7 recruitment and activation are insufficient alone to drive phagosome-lysosome fusion (PI3K-dependent effectors beyond Rab7 are required).","method":"Genetic epistasis using dominant-negative Rab5 and Rab7 in professional and engineered phagocytes; PI3K inhibition (wortmannin); FRAP for Rab5 activity; measurement of RILP binding as Rab7 activity readout","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (dominant-negatives, pharmacological inhibition, FRAP, effector-binding assays), clear epistasis established","pmids":["12640132"],"is_preprint":false},{"year":2003,"finding":"Rab7 is required for the late endosomal step of influenza virus entry; dominant-negative Rab7 blocks infection by influenza (H1N1 and H3N2) but not by Semliki Forest virus or vesicular stomatitis virus, demonstrating a virus-specific requirement for late endosome function.","method":"Dominant-negative Rab5 and Rab7 expression in HeLa cells; viral ribonucleoprotein colocalization time-course; conformation-specific hemagglutinin antibody assays","journal":"Traffic (Copenhagen, Denmark)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean loss-of-function with multiple viral comparators, single lab","pmids":["12713661"],"is_preprint":false},{"year":2003,"finding":"Rabring7, a RING-finger protein, is a Rab7 effector that specifically binds the GTP-bound form of Rab7 at its N-terminal portion. Rabring7 is recruited from cytosol to late endosomes/lysosomes by active Rab7, and its overexpression causes perinuclear lysosome aggregation and affects EGF degradation.","method":"CytoTrap two-hybrid screen; GST pull-down; co-immunoprecipitation; subcellular localization by fluorescence microscopy; EGF degradation assay","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — GST pull-down and co-IP confirming GTP-dependent interaction, plus functional readout, single lab","pmids":["12972561"],"is_preprint":false},{"year":2003,"finding":"Rab7 functions as a proapoptotic regulator by limiting cell-autonomous nutrient (glucose and amino acid) transporter expression. Blocking Rab7 in growth-factor-deprived cells prevents clearance of nutrient transporters from the cell surface, sustaining mitochondrial membrane potential and growth-factor-independent survival; dominant-negative Rab7 cooperated with E1A for transformation of p53-/- MEFs.","method":"Dominant-negative Rab7 expression; nutrient transporter surface levels; mitochondrial membrane potential measurement; transformation assay in MEFs","journal":"Developmental cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function with defined molecular and cellular readouts, single lab, multiple assays","pmids":["14536059"],"is_preprint":false},{"year":2006,"finding":"Rab7 controls retrograde axonal transport by marking a specific pool of carriers that transport neurotrophins (BDNF), their receptors (TrkB, p75NTR), and tetanus neurotoxin fragment. Rab5 is essential for an early sorting step but is absent from axonally transported vesicles.","method":"Purification of retrogradely transported vesicles using paramagnetic bead-conjugated tetanus neurotoxin fragment; identification of Rab7 by MS; functional validation with Rab5/Rab7 dominant-negatives","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 2 / Strong — biochemical purification combined with functional dominant-negative epistasis, multiple cargo readouts","pmids":["17046692"],"is_preprint":false},{"year":2006,"finding":"Rab7 associates with early and intermediate stage melanosomes and controls microtubule-mediated (dynein/RILP-dependent) transport of these early melanosomes, while mature melanosomes lose Rab7 and instead use Rab27a-myosin Va for actin-dependent transport.","method":"Immunofluorescence colocalization of Rab7 and Rab27a with melanosome stages; functional analysis of motor protein recruitment","journal":"Pigment cell research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — colocalization across defined melanosome maturation stages, mechanistic pathway placement, single lab","pmids":["16965270"],"is_preprint":false},{"year":2008,"finding":"CMT2B-associated Rab7 mutant proteins (L129F, K157N, V162M) exhibit higher nucleotide exchange rates and slower GTP hydrolysis than wild-type Rab7, resulting in 82-89% GTP-bound form in cells vs. 23% for wild type. These mutants bind the Rab7 effector RILP and can rescue Rab7 function after silencing, demonstrating gain-of-function through hyperactivation.","method":"In vitro GTP hydrolysis assays; nucleotide exchange rate measurements; GTP-bound fraction determination in HeLa cells; RILP binding assay; siRNA rescue experiments","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro biochemical assays plus cellular validation with multiple orthogonal methods across three mutants","pmids":["18272684"],"is_preprint":false},{"year":2010,"finding":"Rubicon and PLEKHM1 negatively regulate the endocytic/autophagic pathway via a novel C-terminal RH domain that directly and specifically interacts with Rab7. This interaction is critical for their regulatory functions. Rubicon, but not PLEKHM1, also simultaneously binds PI3-kinase to regulate trafficking.","method":"Database-based homology identification; GST pull-down; co-immunoprecipitation; dominant-negative Rab7 epistasis; pathway readouts for endocytic and autophagic flux","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct binding confirmed by pull-down and co-IP, with functional epistasis showing RH domain requirement","pmids":["20943950"],"is_preprint":false},{"year":2010,"finding":"CMT2B-associated Rab7 mutants inhibit neurite outgrowth in PC12 and Neuro2A cells, as demonstrated by reduced GAP43 upregulation and NeuN expression. The inhibition phenocopies constitutively active Rab7Q67L, consistent with gain-of-function hyperactivation.","method":"Expression of CMT2B Rab7 mutants and constitutively active Rab7 in PC12 and Neuro2A cells; neurite outgrowth measurement; GAP43 and NeuN biochemical quantification","journal":"Acta neuropathologica","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean gain-of-function phenotype in two cell lines with biochemical markers, single lab","pmids":["20464402"],"is_preprint":false},{"year":2010,"finding":"CMT2B Rab7 mutants enhance NGF-stimulated TrkA phosphorylation, increase Erk1/2 signaling from endosomes, and reduce nuclear shuttling of phospho-Erk1/2, thereby decreasing downstream nuclear transcription (MAPK phosphatase expression) and explaining inhibition of neurite outgrowth.","method":"Rab7 CMT2B mutant expression in PC12 cells; TrkA co-immunoprecipitation; phosphorylation assays for TrkA, Akt, Erk1/2; nuclear fractionation","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP and multiple signaling readouts, single lab","pmids":["21151572"],"is_preprint":false},{"year":2012,"finding":"CMT2B Rab7 mutants delay EGF trafficking to LAMP1-positive late endosomes/lysosomes, slow EGFR degradation, enhance and prolong EGFR signaling and p38/ERK1/2 phosphorylation, but reduce nuclear translocation of p38/ERK1/2, thereby decreasing downstream nuclear activation of Elk-1 and immediate early genes.","method":"EGF trafficking assays in three cell lines; EGFR degradation assays; phospho-signaling Western blots; nuclear fractionation; Elk-1 transcriptional reporter assays","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal functional assays across three cell lines, single lab","pmids":["23188822"],"is_preprint":false},{"year":2012,"finding":"RAB7A directly interacts with vimentin (identified by yeast two-hybrid and confirmed by co-immunoprecipitation and pull-down with recombinant proteins). Overexpression of Rab7a increases vimentin phosphorylation and shifts vimentin to the soluble fraction; Rab7a silencing increases vimentin in the insoluble (assembled) fraction. CMT2B Rab7a mutants also increase soluble vimentin.","method":"Yeast two-hybrid; co-immunoprecipitation; GST pull-down with bacterially expressed recombinant proteins; immunofluorescence; subcellular fractionation","journal":"Biochimica et biophysica acta","confidence":"High","confidence_rationale":"Tier 1 / Moderate — direct interaction confirmed by reconstitution with recombinant proteins, plus orthogonal cellular functional assays","pmids":["23458836"],"is_preprint":false},{"year":2013,"finding":"CMT2B Rab7 mutants dysregulate axonal transport (increased anterograde velocity and fraction), cause premature degradation of TrkA (reducing surface TrkA and NGF binding), and markedly impair NGF-induced Erk1/2 activation and PC12 cell differentiation, leading to axonal degeneration in DRG neurons.","method":"Live axonal transport imaging in E15.5 rat DRG neurons; surface TrkA measurement by flow cytometry; NGF binding assay; Erk1/2 phosphorylation; siRNA knockdown of Rab7","journal":"The Journal of neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — live imaging plus multiple functional assays, single lab","pmids":["23616551"],"is_preprint":false},{"year":2013,"finding":"Drosophila CMT2B rab7 mutants retain 10-50% function and cause neurodegeneration through partial loss of function (not gain of function). Loss of rab7 causes adult-onset neurodegeneration; overexpression of CMT2B mutants does not impair endosomal maturation but reduces efficient endosome recruitment.","method":"In vivo quantitative imaging, electrophysiology, and rescue experiments in Drosophila sensory and motor neurons; live endosome imaging","journal":"eLife","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple in vivo assays in Drosophila model, but contradicts other labs' gain-of-function interpretation","pmids":["24327558"],"is_preprint":false},{"year":2012,"finding":"RAB7A directly interacts with peripherin, a neuronal intermediate filament protein expressed primarily in peripheral neurons, via direct binding confirmed with recombinant proteins. CMT2B RAB7A mutants bind peripherin more strongly and alter its solubility, suggesting this interaction contributes to the neuronal specificity of CMT2B.","method":"Yeast two-hybrid screen with DRG cDNA library; co-immunoprecipitation; pull-down with recombinant proteins; siRNA knockdown and overexpression of RAB7A with peripherin solubility assay","journal":"Acta neuropathologica","confidence":"High","confidence_rationale":"Tier 1 / Moderate — direct binding established with recombinant proteins plus orthogonal cellular assays, single lab","pmids":["23179371"],"is_preprint":false},{"year":2014,"finding":"LKB1 kinase functions as a RAB7 effector, specifically binding GTP-bound RAB7 (not GDP-bound dominant-negative RAB7), and promotes formation of a complex between NRP-1 and RAB7 in late endosomes to facilitate lysosomal degradation of neuropilin-1 (NRP-1) and suppress angiogenesis.","method":"Co-immunoprecipitation of LKB1 with GTP- vs. GDP-bound RAB7 forms; RAB7 siRNA depletion and NRP-1 trafficking rescue; LKB1-NRP-1-RAB7 complex formation assays","journal":"The Journal of clinical investigation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — GTP-dependent co-IP and siRNA loss-of-function with defined cargo readout, single lab","pmids":["25180605"],"is_preprint":false},{"year":2016,"finding":"DEF8 interacts with PLEKHM1 and promotes its binding to RAB7; FAM98A and NDEL1 interact with PLEKHM1 to connect lysosomes to microtubules. Loss of PLEKHM1, DEF8, FAM98A, or NDEL1 impairs peripheral lysosome distribution and bone resorption in osteoclasts via RAB7.","method":"Co-immunoprecipitation; germline and conditional Plekhm1 knockout mice; lysosome positioning assays in osteoclasts; bone resorption assay","journal":"JCI insight","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP and in vivo KO with defined functional readouts, single lab","pmids":["27777970"],"is_preprint":false},{"year":2016,"finding":"Rab7a depletion causes slower cell migration, impaired cell adhesion and spreading on fibronectin, reduced β1-integrin activation and trafficking, decreased active Rac1 levels, and loss of properly oriented vimentin filaments during migration.","method":"siRNA knockdown of Rab7a in NCI H1299 cells; migration velocity and directness quantification; fibronectin adhesion/spreading assay; Rac1 activity (pull-down assay); β1-integrin localization and activation","journal":"Biochimica et biophysica acta. Molecular cell research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean siRNA KD with multiple orthogonal phenotypic readouts and pathway markers, single lab","pmids":["27888097"],"is_preprint":false},{"year":2016,"finding":"Vps34 PI3K produces PI(3)P required to recruit the Rab7 GAP Armus (TBC1D2) to late endosomes. In Vps34-/- MEFs, failure to recruit Armus leads to hyperactivated Rab7 (elevated Rab7-GTP), enlarged late endosomes, failed ILV formation, and decreased EGFR degradation. Rab7 silencing or Armus overexpression rescues vacuolization.","method":"Vps34 knockout MEFs; Rab7-GTP pull-down assay; protein-lipid overlay and liposome binding assays for Armus-PI(3)P interaction; Rab7 siRNA rescue","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — KO cells plus biochemical lipid binding assays plus genetic rescue with defined molecular mechanism","pmids":["27793976"],"is_preprint":false},{"year":2017,"finding":"Rab7 is tyrosine-phosphorylated by Src kinase at Y183. This phosphorylation depends on Rab7's guanine nucleotide binding activity and Src kinase activity, is induced by EGF stimulation, and impairs Rab7 interaction with RILP, thereby inhibiting EGFR degradation and sustaining Akt signaling.","method":"In vitro Src kinase assay with Rab7; site-directed mutagenesis (Y183F); co-immunoprecipitation; EGF stimulation; EGFR degradation assay; Akt signaling readout","journal":"Cellular signalling","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro kinase assay plus mutagenesis plus functional consequences on effector binding and cargo degradation, single lab","pmids":["28336235"],"is_preprint":false},{"year":2017,"finding":"WDR91 is a Rab7 effector that couples Rab switching with PI(3)P down-regulation on endosomes. WDR91 is recruited to endosomes by active GTP-Rab7 and inhibits Rab7-associated PI3K activity. Loss of WDR91 increases endosomal PI(3)P, arrests endosome maturation, and impairs neurite development in mouse neurons.","method":"Co-immunoprecipitation and pull-down of WDR91 with GTP-Rab7; Wdr91 knockout mice (global and brain-specific); PI(3)P measurement; endosome maturation assays; neurite complexity quantification; rescue with WDR91 vs. Rab7-binding mutants","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP, multiple knockout models, functional rescue with binding-deficient mutant establishing specificity","pmids":["28860274"],"is_preprint":false},{"year":2017,"finding":"CD44s (CD44 short isoform) is internalized into endosomes and interacts with Rab7A to inhibit Rab7A-mediated EGFR trafficking to lysosomes and subsequent EGFR degradation.","method":"Co-immunoprecipitation; EGFR trafficking and degradation assays; siRNA knockdown of Rab7A","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP and functional trafficking assay, single lab","pmids":["28716909"],"is_preprint":false},{"year":2017,"finding":"Rab7A regulates tau secretion: deletion of Rab7A decreases tau secretion, dominant-negative Rab7A decreases it, and constitutively active Rab7A increases it. Partial colocalization of tau with Rab7-positive structures indicates late endosomal involvement in tau secretion.","method":"Rab7A knockout and dominant-negative/constitutively active mutant expression in neurons and HeLa cells; tau secretion measurement; immunofluorescence colocalization","journal":"Journal of neurochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gain- and loss-of-function with consistent directional readouts, two cell systems, single lab","pmids":["28222213"],"is_preprint":false},{"year":2017,"finding":"Retromer recruitment to endosomes requires binding to Rab7a. Inhibition of the Rab7a GAP TBC1D5 enhances Rab7a activation and leads to gain of retromer function (improved endosome-to-Golgi retrieval).","method":"TBC1D5 inhibition/knockdown; Rab7a activation state assay; retromer cargo retrieval assays","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional epistasis with retromer cargo readouts, single lab","pmids":["29777037"],"is_preprint":false},{"year":2018,"finding":"Mitochondria-lysosome membrane contact sites form dynamically in healthy cells and are regulated by RAB7 GTP hydrolysis: active GTP-bound lysosomal RAB7 promotes contact formation, while contact untethering requires recruitment of the RAB7 GAP TBC1D15 to mitochondria via FIS1 to drive RAB7 GTP hydrolysis. Lysosomal contacts mark sites of mitochondrial fission.","method":"Electron microscopy, structured illumination microscopy, high-resolution confocal live-cell imaging; TBC1D15 and FIS1 recruitment assays; Rab7 GTP/GDP state manipulation; mitochondrial fission readouts","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — multiple orthogonal imaging modalities plus mechanistic dissection of GTP hydrolysis cycle and functional consequence on mitochondrial fission","pmids":["29364868"],"is_preprint":false},{"year":2018,"finding":"TBK1 directly phosphorylates RAB7A at Ser72 upon mitochondrial depolarization in a PARKIN-dependent manner. Phospho-RAB7A(S72) loses association with RAB GDI, gains association with FLCN-FNIP1 (a DENN domain-containing GEF heterodimer), and is required for ATG9A recruitment to damaged mitochondria and efficient mitophagy.","method":"Global quantitative phosphoproteomics; in vitro TBK1 kinase assay; interaction proteomics with phosphomimetic (S72E) and non-phosphorylatable (S72A) RAB7A mutants; mitophagy flux assay; ATG9A recruitment imaging","journal":"Science advances","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro kinase assay combined with quantitative proteomics, phosphomimetic/phosphodead mutant analysis, and functional mitophagy readout","pmids":["30627666"],"is_preprint":false},{"year":2017,"finding":"Retromer-associated RAB7-specific GAP TBC1D5 controls RAB7 activity and localization; in absence of TBC1D5 or retromer, RAB7 hyperactivates and expands over the entire lysosomal domain. RAB7 also localizes to ER, trans-Golgi network, and mitochondrial membranes in a retromer/TBC1D5-dependent manner. Hyperactivated RAB7 disrupts ATG9a sorting and autophagosome formation around damaged mitochondria during Parkin-mediated mitophagy.","method":"TBC1D5 and retromer subunit KO cells; RAB7 localization by fluorescence microscopy; RAB7 mobility by FRAP; ATG9a sorting assay; mitophagy induction with CCCP","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple KO cell lines, FRAP, functional mitophagy readouts, multiple organelle markers","pmids":["29158324"],"is_preprint":false},{"year":2019,"finding":"Endosomal PI4P (produced primarily by PI4K2A) is required for Rab7 cycling on late endosomes; acute conversion of endosomal PI4P to PI(4,5)P2 causes Rab7 dissociation from late endosomes and releases PLEKHM1. PI4K2A deletion impairs PI(4,5)P2 production, causing defective Rab7 inactivation and increased autophagic structures with impaired autophagosome-lysosome fusion. Rab7 effectors Vps35 and RILP are not affected by acute PI(4,5)P2 production.","method":"Acute PI4P-to-PI(4,5)P2 conversion system; PI4K2A deletion; live-cell imaging of Rab7 and PLEKHM1 dynamics; LC3 structure quantification; autophagosome-lysosome fusion assay","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — acute lipid manipulation plus genetic KO with multiple orthogonal readouts, single lab","pmids":["31368593"],"is_preprint":false},{"year":2019,"finding":"TBK1/IKKε phosphorylate RAB7 at S72 (same site as TBK1 in mitophagy context). Phosphomimetic RAB7-S72E shows diffuse cytosolic localization and enhanced innate immune signaling (STING pathway), while kinase-resistant RAB7-S72A localizes to active puncta promoting lysosomal STING degradation. Thus, RAB7-S72 phosphorylation limits STING turnover, increasing IRF3 target production.","method":"SILAC phosphoproteomics for substrate identification; phosphomimetic and phosphodead RAB7 mutants in TNBC cells; RAB7 localization imaging; STING levels and IRF3 targets (CXCL10, CCL5, IFNβ) measurement","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — phosphoproteomics plus functional mutant analysis, single lab, consistent with PMID 30627666","pmids":["31662325"],"is_preprint":false},{"year":2019,"finding":"Rab7 depletion potently induces spontaneous ciliogenesis and cilia elongation and blocks serum-induced ciliary resorption. Active Rab7 is required for cilia disassembly via cilia tip excision (ectocytosis), which depends on F-actin polymerization at the excision site; Rab7 depletion prevents this F-actin polymerization.","method":"Rab7 siRNA knockdown; cilia length and number quantification; serum-induced cilia resorption assay; live imaging of cilia ectocytosis; F-actin staining at cilia tips; constitutively active Rab7 expression","journal":"The Journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA KD with active mutant confirmation and mechanistic F-actin readout, single lab","pmids":["31619485"],"is_preprint":false},{"year":2019,"finding":"PIPKIγi5 (type Igamma PI4,5P2-kinase isoform 5) directly interacts with Rab7a and is required for Rab7a recruitment to early endosomes. Loss of PIPKIγi5 blocks early-to-late endosome maturation, disrupts retromer-Rab7a connection (preventing CI-M6PR retrograde sorting and hydrolase delivery to lysosomes), and blocks recruitment of Rab7a GAP TBC1D5 to late endosomes.","method":"Co-immunoprecipitation; PIPKIγi5 knockdown; Rab7a localization assay; retromer recruitment; CI-M6PR trafficking; autophagic degradation assay","journal":"FASEB journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP plus loss-of-function with multiple pathway readouts, single lab","pmids":["31908013"],"is_preprint":false},{"year":2020,"finding":"Active Rab7 directly interacts with the NPC1 cholesterol transporter to license lysosomal cholesterol export. C18orf8 is a core subunit of the trimeric Mon1-Ccz1-C18orf8 (MCC) GEF complex required for Rab7 activation; C18orf8 deficiency abolishes Rab7 activation, disrupts late endosome morphology, and causes free cholesterol accumulation in swollen lysosomes (NPC1-like phenotype). A constitutively active Rab7 restores cholesterol export in MCC-deficient cells.","method":"Genome-wide CRISPR screen; co-immunoprecipitation of active Rab7 with NPC1; C18orf8, Ccz1, Mon1 deficiency by CRISPR; constitutively active Rab7 rescue; cholesterol trafficking assays","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — genome-wide functional screen, multiple GEF subunit KOs with rescue by active Rab7, direct interaction shown by co-IP","pmids":["33144569"],"is_preprint":false},{"year":2020,"finding":"CLN3 regulates endosomal function by modulating Rab7A-effector interactions: CLN3 is required for efficient Rab7A interaction with retromer (for endosome-to-TGN trafficking of lysosomal sorting receptors) and with PLEKHM1 (required for autophagosome-lysosome fusion). Loss of CLN3 or disease-causing CLN3 mutations cause degradation of lysosomal sorting receptors.","method":"Co-immunoprecipitation in live cells; CLN3 knockout and disease-mutation expression; lysosomal sorting receptor trafficking assay; autophagosome-lysosome fusion assay","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP plus KO with multiple functional readouts, single lab","pmids":["32034082"],"is_preprint":false},{"year":2021,"finding":"C5orf51 (RMC1) is a specific interactor of GDP-locked RAB7A and a component of the MON1-CCZ1 GEF complex. In absence of C5orf51, RAB7A localization on depolarized mitochondria is compromised and RAB7A is degraded by the proteasome. C5orf51 depletion also inhibits ATG9A recruitment to depolarized mitochondria.","method":"Proximity-dependent biotinylation (miniTurbo) with GDP-locked RAB7A; C5orf51 co-immunoprecipitation with MON1/CCZ1; C5orf51 KO cells; RAB7A stability and localization assay on depolarized mitochondria; ATG9A recruitment assay","journal":"Autophagy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — proximity proteomics plus co-IP plus KO with functional readouts, single lab","pmids":["34432599"],"is_preprint":false},{"year":2021,"finding":"Crystal structure of human PDZD8 coiled-coil domain in complex with GTP-bound Rab7 reveals that two Rab7 molecules bind the opposite sides of the PDZD8 CC in a 2:1 ratio, with the switch I/II and interswitch regions forming the binding interface, consistent with GTP-dependent ER-late endosome tethering.","method":"Crystal structure determination; isothermal titration calorimetry (ITC); mutational analysis of binding interface; GTP-dependence validation","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure plus ITC quantification of binding stoichiometry, direct structural validation of GTP-dependence","pmids":["34552186"],"is_preprint":false},{"year":2021,"finding":"RAB7 activity is required for mitophagy in oocyte meiosis. PRKN (Parkin) ubiquitinates and degrades RAB7A and its GEF complex (CCZ1-MON1) through the ubiquitin-proteasome system, thereby limiting mitophagy. Active RAB7A (Q67L) or RAB7 activator ML098 rescues mitophagy defects and meiotic blockade caused by CCCP.","method":"mRNA microinjection of RAB7Q67L in oocytes; ML098 treatment; CCCP-induced mitophagy; meiosis stage imaging; PINK1/PRKN/RAB7 protein level measurement; ubiquitin-proteasome inhibition rescue","journal":"Autophagy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gain-of-function rescue and pharmacological activation with mechanistic ubiquitin-proteasome pathway placement, single lab","pmids":["34229552"],"is_preprint":false},{"year":2021,"finding":"RAB7A regulates vimentin phosphorylation through AKT and PAK1 kinases. RAB7A overexpression increases vimentin phosphorylation at Ser38 via AKT activity. RAB7A modulation also affects downstream effectors: β-catenin, caspase 9 expression, cofilin-1, and MMP2 activity.","method":"RAB7A overexpression and siRNA knockdown; AKT and PAK1 activity assays; vimentin phospho-site specific antibodies; beta-catenin, caspase 9, cofilin-1 Western blots; MMP2 zymography","journal":"Cancers","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gain- and loss-of-function with kinase activity readouts, single lab","pmids":["34066419"],"is_preprint":false},{"year":2024,"finding":"TBK1 phosphorylation of RAB7A at S72 functions as a phosphoswitch during Parkin-dependent mitophagy: phospho-RAB7A abrogates binding to Rubicon (a negative autophagy regulator with RH domain), while Pacer (a positive regulator with RH domain) specifically binds phospho-RAB7A. In vitro TBK1 phosphorylation of RAB7A blocks Rubicon:RAB7A binding; Pacer knockout reduces Parkin mitophagy but not bulk autophagy; rescue requires an intact phosphate-binding basic triad in Pacer.","method":"Crystal structure of Rubicon:RAB7A complex; in vitro TBK1 phosphorylation; co-immunoprecipitation of Rubicon/Pacer with pRAB7A; Pacer KO cells; Parkin mitophagy assay; rescue with Pacer phosphate-binding mutant","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure plus in vitro phosphorylation assay plus KO plus structure-informed rescue, multiple orthogonal methods","pmids":["38728007"],"is_preprint":false},{"year":2024,"finding":"SIRT5-catalyzed desuccinylation of RAB7A at lysine 31 is required for RAB7A activity. Cadmium exposure decreases SIRT5 expression, increasing RAB7A succinylation at K31 and inhibiting RAB7A activity, thereby blocking autophagosome-lysosome fusion and autophagic clearance. SIRT5 overexpression restores RAB7A activity and autophagic flux.","method":"Proteomic identification of succinylation site; SIRT5 overexpression and knockdown; RAB7A activity assays; autophagosome-lysosome fusion assay; in vivo FAD4T mouse model","journal":"Advanced science (Weinheim, Baden-Wurttemberg, Germany)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — proteomic identification of PTM site plus gain/loss-of-function in vitro and in vivo, single lab","pmids":["38837686"],"is_preprint":false},{"year":2024,"finding":"SARS-CoV-2 ORF3a, in complex with Vps39, sequesters the Rab7 GAP TBC1D5, preventing GTP hydrolysis and causing Rab7 hyperactivation. Hyperactive Rab7 impairs CI-M6PR retrieval from late endosomes to TGN, disrupts lysosomal hydrolase delivery, reduces Rab7-Arl8b compartment tethering, and promotes viral egress. The Rab7 GDP-locked mutant strongly reduces viral replication.","method":"SARS-CoV-2 infection and ORF3a expression; co-immunoprecipitation of ORF3a-Vps39-TBC1D5; Rab7 activation state assay; CI-M6PR trafficking; lysosomal hydrolase delivery assay; Rab7 GDP mutant viral replication assay","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple co-IP interactions, functional cargo trafficking assays, viral genetic rescue, consistent mechanism across ORF3a variants","pmids":["38448435"],"is_preprint":false},{"year":2024,"finding":"TBK1 is recruited to lysosomes in response to elevated amino acid levels, where it phosphorylates Rab7 at S72 to alleviate Rab7-mediated inhibition of amino acid-dependent mTORC1 activation. An ALS/FTD-associated TBK1 E696K mutant constitutively accumulates at lysosomes, causing elevated Rab7 S72 phosphorylation and increased mTORC1 activation.","method":"Lysosomal TBK1 fractionation; Rab7 S72 phosphorylation assay under amino acid conditions; mTORC1 activation readout; TBK1 E696K mutant analysis","journal":"The EMBO journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — fractionation plus phosphorylation and mTORC1 readouts, disease mutant validation, single lab","pmids":["39103493"],"is_preprint":false},{"year":2024,"finding":"USP4 deubiquitinase maintains RAB7A in an active deubiquitinated state; reduced USP4 in periodontitis leads to RAB7A ubiquitination, impairing lysosomal trafficking and autophagosome-lysosome fusion. RAB7A inactivation directly reduces autophagy efficiency and drives periodontitis progression.","method":"Proteomics identification of USP4-RAB7A interaction; USP4 and RAB7A knockdown/overexpression; ubiquitination assay; autophagosome-lysosome fusion assay; experimental periodontitis mouse model","journal":"Autophagy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — proteomics plus ubiquitination assay plus in vivo model, single lab","pmids":["39663592"],"is_preprint":false},{"year":2011,"finding":"Rab7A is required for efficient HIV-1 production. Rab7A depletion by siRNA impairs Env glycoprotein processing, reduces incorporation of mature Env into viral particles, decreases HIV-1 infectivity, and induces a BST2/Tetherin-like phenotype on HIV-1 release, suggesting Rab7A contributes to the mechanism by which Vpu counteracts BST2/Tetherin.","method":"RNA interference targeting Rab7A; virological assays (Env processing, viral particle infectivity); BST2/Tetherin release assay","journal":"PLoS pathogens","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA KD with multiple virological readouts, single lab","pmids":["22072966"],"is_preprint":false},{"year":2015,"finding":"Rab7a and Rab27b control microRNA (miR-143) secretion through extracellular vesicles in shear-stressed endothelial cells, in a KLF2-dependent manner.","method":"siRNA knockdown of Rab7a and Rab27b; miR-143 secretion measurement in extracellular vesicle fractions; KLF2 pathway context","journal":"FEBS letters","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single KD experiment, single lab, limited mechanistic detail in abstract","pmids":["26348397"],"is_preprint":false},{"year":2018,"finding":"Rab7a is required for degradation of dendritic cargo proteins (Nsg1, Nsg2): Rab7 activity mobilizes distal pre-degradative late endosomes for retrograde transport to the soma for terminal lysosomal degradation. Most dendritic LAMP1 endosomes are not degradative lysosomes.","method":"Rab7 dominant-negative expression in neurons; live imaging of late endosomes; degradation assay for Nsg1/Nsg2; colocalization of LAMP1 with CatB/D","journal":"The Journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — dominant-negative loss-of-function with cargo-specific degradation readout and live imaging, single lab","pmids":["29907658"],"is_preprint":false},{"year":2022,"finding":"Dynein motor activity is required for Rab7-dependent retrograde transport of late endosomes in dendrites and for endosome maturation. Inhibiting dynein (directly or via RILP C-terminus expression) delays somatic endosome maturation (evidenced by excess Rab7 accumulation) and inhibits degradation of dendritic cargos. Rab7 GDP-GTP cycling appears necessary for late endosome fusion with lysosomes subsequent to somatic arrival.","method":"Multiple dynein/dynactin inhibition approaches (drugs, RILP C-terminus dominant negative); quantitative live imaging of late endosomes in dendrites; cargo degradation assays in hippocampal neurons","journal":"The Journal of neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple inhibition approaches with consistent readouts, single lab","pmids":["35474277"],"is_preprint":false},{"year":2017,"finding":"Rab7 GTPase directly interacts with mTOR at its N-terminal heat repeat domain. Rab7 GTPase knockdown in LAL-deficient myeloid cells reverses altered lysosome/mTOR distribution, reduces mTOR hyperactivation, and decreases downstream S6 phosphorylation, glucose consumption, and ROS production.","method":"Co-immunoprecipitation; GST pull-down with recombinant GST-Rab7 fusion protein; siRNA knockdown; lysosome distribution and mTOR co-localization; metabolic assays","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — GST pull-down with recombinant protein plus co-IP and functional siRNA KD readouts, single lab","pmids":["28415797"],"is_preprint":false}],"current_model":"RAB7A is a small GTPase that cycles between GTP-bound (active) and GDP-bound (inactive) states to orchestrate multiple aspects of the endolysosomal system: it controls early-to-late endosome maturation, recruits effectors (RILP, FYCO1, retromer, WDR91, PLEKHM1, Rubicon/Pacer) to regulate late endosome motility, fusion with lysosomes, and lysosomal biogenesis; active GTP-RAB7 promotes mitochondria-lysosome contact formation and marks sites of mitochondrial fission, while GTP hydrolysis (driven by GAPs TBC1D5, Armus/TBC1D2, and TBC1D15 recruited via FIS1) releases these contacts; RAB7A is phosphorylated at S72 by TBK1 (and IKKε) in a PARKIN-dependent manner to switch effector preference from Rubicon (negative regulator) to Pacer (positive regulator), enabling Parkin-dependent mitophagy and ATG9A recruitment; RAB7A is also tyrosine-phosphorylated by Src at Y183, impairing RILP binding and EGFR degradation; RAB7A is succinylated at K31 (reversed by SIRT5) and ubiquitinated (reversed by USP4) as additional post-translational regulatory mechanisms; the GEF complex Mon1-Ccz1-C18orf8 activates RAB7A to enable NPC1-dependent lysosomal cholesterol export; in neurons, RAB7A controls retrograde axonal transport of neurotrophin-signaling endosomes and axonal integrity, and CMT2B-causing missense mutations hyperactivate RAB7A (elevated GTP loading, slower hydrolysis), altering effector interactions and perturbing NGF/TrkA and EGFR trafficking and signaling."},"narrative":{"mechanistic_narrative":"RAB7A is a small GTPase that acts as the master organizer of the endolysosomal system, cycling between GTP-bound (active) and GDP-bound (inactive) states to control late endosome maturation, motility, and fusion with lysosomes [PMID:10679007]. Active GTP-RAB7A recruits a diverse set of effectors from the cytosol to late endosomal membranes — including the RING-finger protein Rabring7 [PMID:12972561], the RH-domain proteins Rubicon and PLEKHM1 [PMID:20943950], WDR91 [PMID:28860274], LKB1 [PMID:25180605], and retromer [PMID:29777037] — to govern cargo degradation, endosome-to-Golgi retrieval, and autophagic flux, while motor-adaptor coupling through RILP and dynein directs microtubule-based retrograde transport [PMID:16965270, PMID:35474277]. Its activation cycle is set by upstream regulators: the Mon1-Ccz1-C18orf8/RMC1 GEF complex loads GTP to license RAB7A function including NPC1-dependent lysosomal cholesterol export [PMID:33144569, PMID:34432599], whereas GAPs TBC1D5, Armus/TBC1D2, and TBC1D15 drive GTP hydrolysis to inactivate RAB7A and restrict its membrane domain [PMID:27793976, PMID:29364868, PMID:29158324]. RAB7A also coordinates membrane contact sites, directly binding the ER tether PDZD8 and promoting mitochondria-lysosome contacts whose untethering requires FIS1-recruited TBC1D15-driven GTP hydrolysis, with these contacts marking sites of mitochondrial fission [PMID:29364868, PMID:34552186]. A layer of post-translational control tunes effector choice and activity: TBK1 (and IKKε) phosphorylate RAB7A at Ser72 to switch effector preference from the inhibitory Rubicon to the activating Pacer, enabling Parkin-dependent mitophagy and ATG9A recruitment [PMID:30627666, PMID:38728007], while Src-mediated Tyr183 phosphorylation impairs RILP binding and slows EGFR degradation [PMID:28336235]; succinylation at Lys31 (reversed by SIRT5) [PMID:38837686] and ubiquitination (reversed by USP4) [PMID:39663592] further regulate RAB7A activity and autophagic clearance. In neurons RAB7A marks retrograde carriers transporting neurotrophins and their receptors and maintains axonal and dendritic cargo degradation [PMID:17046692, PMID:29907658], and CMT2B-causing missense mutations hyperactivate RAB7A — elevating GTP loading and slowing hydrolysis — to perturb NGF/TrkA and EGFR trafficking and signaling and to drive neurodegeneration [PMID:18272684, PMID:23616551].","teleology":[{"year":2000,"claim":"Established RAB7A as the GTPase controlling late endosome/lysosome fusion and maintenance of the perinuclear lysosomal compartment, defining its core cellular role.","evidence":"Dominant-negative and constitutively active EGFP-Rab7 mutants in HeLa cells scored against lysosomal morphology, acidification, and cargo access","pmids":["10679007"],"confidence":"High","gaps":["Did not identify the effectors mediating fusion","Upstream activation machinery unknown"]},{"year":2003,"claim":"Connected RAB7A to phosphoinositide signaling and placed it downstream of Rab5 in the maturation cascade, showing nucleotide cycling drives effector engagement on late endosomes.","evidence":"Co-IP and PI3K activity assays linking hVPS34/p150 to Rab7; genetic epistasis with dominant-negative Rab5/Rab7 on phagosomes; identification of the GTP-specific effector Rabring7","pmids":["14617358","12640132","12972561"],"confidence":"Medium","gaps":["Direct GEF/GAP identities not yet defined","Causal direction between PI(3)P and Rab7 activity unresolved at this stage"]},{"year":2003,"claim":"Extended RAB7A function beyond canonical degradation to virus entry and to cell-autonomous nutrient transporter clearance/apoptosis, broadening its physiological reach.","evidence":"Dominant-negative Rab7 blocking influenza late-endosomal entry; loss-of-function effects on surface nutrient transporters and survival in growth-factor-deprived cells","pmids":["12713661","14536059"],"confidence":"Medium","gaps":["Effectors mediating these specialized roles not defined","Mechanism of transporter retention versus degradation unresolved"]},{"year":2006,"claim":"Defined RAB7A as the marker of retrograde axonal carriers and stage-specific organelle transport, showing it couples cargo identity to dynein/RILP-based motility.","evidence":"Biochemical purification of retrograde neurotrophin vesicles identifying Rab7 by MS, plus dominant-negative epistasis; colocalization across melanosome maturation stages","pmids":["17046692","16965270"],"confidence":"High","gaps":["Quantitative contribution of RAB7A versus other GTPases to transport unclear","How Rab7 selects specific cargo pools unknown"]},{"year":2008,"claim":"Established the molecular basis of CMT2B disease as RAB7A hyperactivation — elevated nucleotide exchange and slowed hydrolysis producing a predominantly GTP-bound mutant that retains effector binding.","evidence":"In vitro GTP hydrolysis and exchange assays, cellular GTP-bound fraction measurement, RILP binding, and siRNA rescue across L129F/K157N/V162M mutants","pmids":["18272684"],"confidence":"High","gaps":["How hyperactivation translates to neuron-specific degeneration not addressed here","Effector rewiring downstream of hyperactivation not mapped"]},{"year":2010,"claim":"Linked CMT2B RAB7A hyperactivation to neuronal phenotypes and identified the RH-domain effectors Rubicon/PLEKHM1, expanding the effector repertoire and tying gain-of-function to neurite defects.","evidence":"Neurite outgrowth assays in PC12/Neuro2A with CMT2B and Q67L mutants; GST pull-down and co-IP defining the RH-domain Rab7 interaction","pmids":["20464402","20943950"],"confidence":"Medium","gaps":["Causal chain from effector binding to outgrowth not fully resolved","Whether RH-domain effectors mediate the CMT2B phenotype untested"]},{"year":2012,"claim":"Showed CMT2B mutants distort growth-factor receptor trafficking and signaling, slowing TrkA/EGFR degradation while paradoxically reducing nuclear signal delivery, providing a signaling mechanism for disease.","evidence":"Co-IP, phospho-signaling Westerns, nuclear fractionation, and transcriptional reporters in PC12 cells and multiple lines tracking TrkA, EGFR, Erk1/2, p38, and Elk-1","pmids":["21151572","23188822"],"confidence":"Medium","gaps":["Single-lab signaling readouts","Relative contribution of TrkA versus EGFR defects to neuropathy unresolved"]},{"year":2012,"claim":"Connected RAB7A to the intermediate filament cytoskeleton, identifying direct binding to vimentin and peripherin and a role in filament solubility, hinting at the neuronal specificity of CMT2B.","evidence":"Yeast two-hybrid, co-IP, and pull-downs with recombinant proteins; solubility fractionation with wild-type and CMT2B mutants","pmids":["23458836","23179371"],"confidence":"High","gaps":["Mechanism linking filament solubility to endosomal function unclear","Whether filament binding is GTP-dependent not established"]},{"year":2013,"claim":"Tested CMT2B disease mechanism in vivo and in primary neurons, with one model supporting gain-of-function signaling/transport defects and another arguing for partial loss of function, exposing a mechanistic divergence.","evidence":"Live axonal transport imaging and TrkA/NGF assays in rat DRG neurons; quantitative imaging, electrophysiology, and rescue in Drosophila neurons","pmids":["23616551","24327558"],"confidence":"Medium","gaps":["Gain- versus loss-of-function interpretation unreconciled across systems","Species and assay differences may confound the comparison"]},{"year":2014,"claim":"Identified additional GTP-specific effectors and cargo-degradation roles, including LKB1-mediated NRP-1 degradation, embedding RAB7A in angiogenesis control.","evidence":"GTP- versus GDP-specific co-IP of LKB1 and siRNA rescue of NRP-1 trafficking","pmids":["25180605"],"confidence":"Medium","gaps":["Single-lab effector assignment","Generalizability beyond NRP-1 untested"]},{"year":2016,"claim":"Resolved the lipid logic of RAB7A inactivation and effector scaffolding, showing Vps34-derived PI(3)P recruits the GAP Armus to switch off Rab7, and that adaptor complexes link Rab7-lysosomes to microtubules for cell-type functions like bone resorption.","evidence":"Vps34-KO MEFs with Rab7-GTP pull-downs and lipid-binding assays; co-IP and conditional Plekhm1-KO mice with lysosome positioning and bone resorption readouts; siRNA effects on migration and integrin/Rac1 signaling","pmids":["27793976","27777970","27888097"],"confidence":"High","gaps":["How PI(3)P spatially restricts Armus to specific endosomes incompletely defined","Coordination of GEF and GAP lipid cues unresolved"]},{"year":2017,"claim":"Defined a multi-layered control of the RAB7A cycle: tyrosine phosphorylation by Src tuning effector binding, retromer/TBC1D5-dependent restriction of the active Rab7 domain, and WDR91 coupling Rab switching to PI(3)P down-regulation.","evidence":"In vitro Src kinase assay with Y183F mutagenesis; TBC1D5/retromer-KO cells with FRAP and organelle markers; WDR91 reciprocal co-IP, knockout mice, and binding-mutant rescue","pmids":["28336235","29158324","28860274","29777037","28716909","28222213","28415797"],"confidence":"High","gaps":["Integration of multiple PTMs and GAPs onto a single Rab7 pool unresolved","Crosstalk between Src, retromer, and lipid cues not jointly tested"]},{"year":2018,"claim":"Established the Ser72 phosphoswitch in mitophagy and revealed RAB7A as a regulator of membrane contact sites, controlling mitochondria-lysosome tethering and mitochondrial fission.","evidence":"Phosphoproteomics and in vitro TBK1 kinase assay with S72E/S72A mutants and mitophagy/ATG9A readouts; multi-modal imaging of mitochondria-lysosome contacts with TBC1D15/FIS1 manipulation","pmids":["30627666","29364868","29907658"],"confidence":"High","gaps":["Which GEF acts on phospho-Rab7 at damaged mitochondria not fully defined at this stage","How contact-site Rab7 is spatially distinguished from degradative Rab7 unclear"]},{"year":2019,"claim":"Dissected phosphoinositide-driven Rab7 cycling on/off membranes and showed the Ser72 phosphoswitch also governs innate immune (STING) and ciliary outcomes, broadening its regulatory reach.","evidence":"Acute PI4P-to-PI(4,5)P2 conversion and PI4K2A KO with live Rab7/PLEKHM1 imaging; PIPKIγi5 co-IP and KD; phosphomimetic Rab7 effects on STING/IRF3 targets; siRNA effects on ciliogenesis and ectocytosis","pmids":["31368593","31908013","31662325","31619485"],"confidence":"Medium","gaps":["How distinct phosphoinositides are coordinated across endosome maturation incompletely resolved","Single-lab readouts for STING and cilia roles"]},{"year":2020,"claim":"Identified the trimeric Mon1-Ccz1-C18orf8 GEF as the activator licensing Rab7-NPC1-dependent lysosomal cholesterol export, and showed CLN3 organizes Rab7-effector interactions, anchoring Rab7 in lysosomal storage disease biology.","evidence":"Genome-wide CRISPR screen, GEF subunit KOs with active-Rab7 rescue, and Rab7-NPC1 co-IP; CLN3-KO and disease-mutant co-IP with retromer/PLEKHM1 trafficking assays","pmids":["33144569","32034082"],"confidence":"High","gaps":["Stoichiometry and assembly of the GEF complex on membranes not fully resolved","How CLN3 mechanistically promotes effector binding unclear"]},{"year":2021,"claim":"Defined RMC1/C5orf51 as a MON1-CCZ1 component stabilizing GDP-Rab7, solved the structural basis of GTP-dependent PDZD8 tethering, and showed Parkin ubiquitinates and degrades Rab7 and its GEF to limit mitophagy.","evidence":"miniTurbo proximity proteomics and co-IP with GDP-locked Rab7 plus C5orf51 KO; crystal structure and ITC of PDZD8-CC:GTP-Rab7; oocyte Rab7Q67L/ML098 rescue with ubiquitin-proteasome analysis","pmids":["34432599","34552186","34229552"],"confidence":"Medium","gaps":["How GEF complex composition is regulated dynamically unresolved","Physiological balance between Parkin activation and degradation of Rab7 unclear"]},{"year":2024,"claim":"Resolved the structural and functional logic of the Ser72 phosphoswitch (Rubicon-to-Pacer exchange), added succinylation/ubiquitination as activity-tuning PTMs, linked Rab7 to mTORC1 and ALS/FTD, and showed viral hijacking of Rab7 GAPs to drive hyperactivation.","evidence":"Rubicon:Rab7 crystal structure with in vitro TBK1 phosphorylation, Pacer KO and phosphate-binding mutant rescue; SIRT5 desuccinylation (K31) and USP4 deubiquitination assays with in vivo models; lysosomal TBK1-Rab7-mTORC1 axis and TBK1 E696K mutant; SARS-CoV-2 ORF3a-Vps39 sequestration of TBC1D5","pmids":["38728007","38837686","39663592","39103493","38448435"],"confidence":"High","gaps":["How multiple PTMs are integrated on the same Rab7 molecule in time unresolved","In vivo relevance of the mTORC1 and STING branches to human disease incompletely established"]},{"year":null,"claim":"It remains unresolved how the many parallel inputs — distinct GEF/GAP modules, phosphoinositide cues, and the Ser72/Tyr183/Lys31/ubiquitin post-translational marks — are spatially and temporally integrated on individual Rab7 pools to select specific effectors and membrane outcomes, and how this integration is corrupted in CMT2B and other diseases.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model coordinating PTMs, GEFs, GAPs, and lipids on a single Rab7 domain","Gain- versus loss-of-function in CMT2B unreconciled across model systems","Effector-selection rules across the many specialized Rab7 functions undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003924","term_label":"GTPase activity","supporting_discovery_ids":[0,8,26,20]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[4,9,22,17,25]}],"localization":[{"term_id":"GO:0005764","term_label":"lysosome","supporting_discovery_ids":[0,26,33,28]},{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[36,28]},{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[26,28]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[4,27]}],"pathway":[{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[0,25,32]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[27,39,28,29]},{"term_id":"R-HSA-9609507","term_label":"Protein localization","supporting_discovery_ids":[6,7,46,47]},{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[33,42,48]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[8,41,44]}],"complexes":[],"partners":["RILP","PLEKHM1","WDR91","TBC1D5","TBC1D15","NPC1","PDZD8","RUBICON"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P51149","full_name":"Ras-related protein Rab-7a","aliases":[],"length_aa":207,"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 sets of downstream effectors directly responsible for vesicle formation, movement, tethering and fusion (PubMed:38538795). In its active state, RAB7A binds to a variety of effector proteins playing a key role in the regulation of endo-lysosomal trafficking. Governs early-to-late endosomal maturation, microtubule minus-end as well as plus-end directed endosomal migration and positioning, and endosome-lysosome transport through different protein-protein interaction cascades. Also plays a central role in growth-factor-mediated cell signaling, nutrient-transportor mediated nutrient uptake, neurotrophin transport in the axons of neurons and lipid metabolism. Also involved in regulation of some specialized endosomal membrane trafficking, such as maturation of melanosomes, pathogen-induced phagosomes (or vacuoles) and autophagosomes. Plays a role in the maturation and acidification of phagosomes that engulf pathogens, such as S.aureus and M.tuberculosis. Plays a role in the fusion of phagosomes with lysosomes. In concert with RAC1, plays a role in regulating the formation of RBs (ruffled borders) in osteoclasts. Controls the endosomal trafficking and neurite outgrowth signaling of NTRK1/TRKA (PubMed:11179213, PubMed:12944476, PubMed:14617358, PubMed:20028791, PubMed:21255211). Regulates the endocytic trafficking of the EGF-EGFR complex by regulating its lysosomal degradation. Involved in the ADRB2-stimulated lipolysis through lipophagy, a cytosolic lipase-independent autophagic pathway (By similarity). Required for the exosomal release of SDCBP, CD63 and syndecan (PubMed:22660413). Required for vesicular trafficking and cell surface expression of ACE2 (PubMed:33147445). May play a role in PRPH neuronal intermediate filament assembly (By similarity)","subcellular_location":"Cytoplasmic vesicle, phagosome membrane; Late endosome membrane; Lysosome membrane; Melanosome membrane; Cytoplasmic vesicle, autophagosome membrane; Lipid droplet; Endosome membrane; Cytoplasmic vesicle; Mitochondrion membrane","url":"https://www.uniprot.org/uniprotkb/P51149/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/RAB7A","classification":"Not Classified","n_dependent_lines":550,"n_total_lines":1208,"dependency_fraction":0.4552980132450331},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000075785","cell_line_id":"CID000441","localizations":[{"compartment":"vesicles","grade":3}],"interactors":[{"gene":"LAMP1","stoichiometry":10.0},{"gene":"ARL8B","stoichiometry":4.0},{"gene":"GDI1","stoichiometry":4.0},{"gene":"VPS35","stoichiometry":4.0},{"gene":"CAPZB","stoichiometry":0.2},{"gene":"DDOST","stoichiometry":0.2},{"gene":"LAMTOR2","stoichiometry":0.2},{"gene":"OST4","stoichiometry":0.2},{"gene":"ATP6V1G1;ATP6V1G2-DDX39B;ATP6V1G2","stoichiometry":0.2},{"gene":"TOMM40","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/target/CID000441","total_profiled":1310},"omim":[{"mim_id":"621516","title":"DIFFERENTIALLY EXPRESSED IN FDCP 8, MOUSE, HOMOLOG OF; DEF8","url":"https://www.omim.org/entry/621516"},{"mim_id":"620266","title":"RAB7A-INTERACTING MON1-CCZ1 COMPLEX SUBUNIT 1; RIMOC1","url":"https://www.omim.org/entry/620266"},{"mim_id":"614235","title":"PDZ DOMAIN-CONTAINING PROTEIN 8; PDZD8","url":"https://www.omim.org/entry/614235"},{"mim_id":"611464","title":"MON1 HOMOLOG A, SECRETORY TRAFFICKING-ASSOCIATED; MON1A","url":"https://www.omim.org/entry/611464"},{"mim_id":"610456","title":"STERILE ALPHA MOTIF DOMAIN-CONTAINING PROTEIN 9; SAMD9","url":"https://www.omim.org/entry/610456"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Lysosomes","reliability":"Approved"},{"location":"Primary cilium transition zone","reliability":"Approved"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/RAB7A"},"hgnc":{"alias_symbol":[],"prev_symbol":["RAB7","CMT2B"]},"alphafold":{"accession":"P51149","domains":[{"cath_id":"3.40.50.300","chopping":"6-42_49-176","consensus_level":"high","plddt":93.6635,"start":6,"end":176}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P51149","model_url":"https://alphafold.ebi.ac.uk/files/AF-P51149-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P51149-F1-predicted_aligned_error_v6.png","plddt_mean":88.69},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=RAB7A","jax_strain_url":"https://www.jax.org/strain/search?query=RAB7A"},"sequence":{"accession":"P51149","fasta_url":"https://rest.uniprot.org/uniprotkb/P51149.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P51149/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P51149"}},"corpus_meta":[{"pmid":"10679007","id":"PMC_10679007","title":"Rab7: a key to lysosome 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sensitize the anti-cancer therapy of hepatocellular carcinoma.","date":"2022","source":"Biochemical pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/35697120","citation_count":17,"is_preprint":false},{"pmid":"11038317","id":"PMC_11038317","title":"Trypanosoma cruzi: cloning and characterization of a RAB7 gene.","date":"2000","source":"Experimental parasitology","url":"https://pubmed.ncbi.nlm.nih.gov/11038317","citation_count":16,"is_preprint":false},{"pmid":"33781048","id":"PMC_33781048","title":"Vps34 Inhibits Hepatocellular Carcinoma Invasion by Regulating Endosome-Lysosome Trafficking via Rab7-RILP and Rab11.","date":"2021","source":"Cancer research and treatment","url":"https://pubmed.ncbi.nlm.nih.gov/33781048","citation_count":16,"is_preprint":false},{"pmid":"37293593","id":"PMC_37293593","title":"SIRT1 mediated gastric cancer progression under glucose deprivation through the FoxO1-Rab7-autophagy axis.","date":"2023","source":"Frontiers in oncology","url":"https://pubmed.ncbi.nlm.nih.gov/37293593","citation_count":16,"is_preprint":false},{"pmid":"31958036","id":"PMC_31958036","title":"IFNB/interferon-β regulates autophagy via a MIR1-TBC1D15-RAB7 pathway.","date":"2020","source":"Autophagy","url":"https://pubmed.ncbi.nlm.nih.gov/31958036","citation_count":16,"is_preprint":false},{"pmid":"39663592","id":"PMC_39663592","title":"USP4 depletion-driven RAB7A ubiquitylation impairs autophagosome-lysosome fusion and aggravates periodontitis.","date":"2024","source":"Autophagy","url":"https://pubmed.ncbi.nlm.nih.gov/39663592","citation_count":15,"is_preprint":false},{"pmid":"36048753","id":"PMC_36048753","title":"HTT (huntingtin) and RAB7 co-migrate retrogradely on a signaling LAMP1-containing late endosome during axonal injury.","date":"2022","source":"Autophagy","url":"https://pubmed.ncbi.nlm.nih.gov/36048753","citation_count":15,"is_preprint":false},{"pmid":"39103493","id":"PMC_39103493","title":"Lysosomal TBK1 responds to amino acid availability to relieve Rab7-dependent mTORC1 inhibition.","date":"2024","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/39103493","citation_count":15,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":51133,"output_tokens":13128,"usd":0.175159,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":24473,"output_tokens":6619,"usd":0.14392,"stage2_stop_reason":"end_turn"},"total_usd":0.319079,"stage1_batch_id":"msgbatch_01CNoDbkChHEkgrJnL7BwtGJ","stage2_batch_id":"msgbatch_016Y4x9E9Wg5VQDANj9quSQD","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2000,\n      \"finding\": \"RAB7A (Rab7) controls aggregation and fusion of late endocytic structures/lysosomes and is essential for maintenance of the perinuclear lysosome compartment. Dominant-negative Rab7 mutants (T22N, N125I) caused lysosome dispersal, loss of acidification, and inaccessibility to endocytosed LDL, while constitutively active Rab7Q67L enhanced perinuclear lysosome aggregation and fusion.\",\n      \"method\": \"Transient expression of EGFP-tagged wild-type and mutant Rab7 in HeLa cells; colocalization with cathepsin D, LAMP1, LysoTracker Red, transferrin receptor, CI-M6PR, TGN-38\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean gain- and loss-of-function with multiple orthogonal readouts (lysosome morphology, acidity, cargo access), replicated across expression levels\",\n      \"pmids\": [\"10679007\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"hVPS34 (class III PI3K) and its adaptor p150 are direct Rab7 interacting partners that colocalize on late endosomes; hVPS34 kinase activity is dependent on nucleotide cycling of Rab7, and Rab7 expression modulates total cellular PI(3)P levels.\",\n      \"method\": \"Co-immunoprecipitation, colocalization by fluorescence microscopy, PI3K activity assays with dominant-negative and constitutively active Rab7\",\n      \"journal\": \"Traffic (Copenhagen, Denmark)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP plus functional kinase assay, single lab\",\n      \"pmids\": [\"14617358\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Rab5 is required upstream of Rab7 recruitment to phagosomes; however, PI3K is required for Rab5 dissociation from phagosomes, and Rab7 recruitment and activation are insufficient alone to drive phagosome-lysosome fusion (PI3K-dependent effectors beyond Rab7 are required).\",\n      \"method\": \"Genetic epistasis using dominant-negative Rab5 and Rab7 in professional and engineered phagocytes; PI3K inhibition (wortmannin); FRAP for Rab5 activity; measurement of RILP binding as Rab7 activity readout\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (dominant-negatives, pharmacological inhibition, FRAP, effector-binding assays), clear epistasis established\",\n      \"pmids\": [\"12640132\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Rab7 is required for the late endosomal step of influenza virus entry; dominant-negative Rab7 blocks infection by influenza (H1N1 and H3N2) but not by Semliki Forest virus or vesicular stomatitis virus, demonstrating a virus-specific requirement for late endosome function.\",\n      \"method\": \"Dominant-negative Rab5 and Rab7 expression in HeLa cells; viral ribonucleoprotein colocalization time-course; conformation-specific hemagglutinin antibody assays\",\n      \"journal\": \"Traffic (Copenhagen, Denmark)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean loss-of-function with multiple viral comparators, single lab\",\n      \"pmids\": [\"12713661\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Rabring7, a RING-finger protein, is a Rab7 effector that specifically binds the GTP-bound form of Rab7 at its N-terminal portion. Rabring7 is recruited from cytosol to late endosomes/lysosomes by active Rab7, and its overexpression causes perinuclear lysosome aggregation and affects EGF degradation.\",\n      \"method\": \"CytoTrap two-hybrid screen; GST pull-down; co-immunoprecipitation; subcellular localization by fluorescence microscopy; EGF degradation assay\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — GST pull-down and co-IP confirming GTP-dependent interaction, plus functional readout, single lab\",\n      \"pmids\": [\"12972561\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Rab7 functions as a proapoptotic regulator by limiting cell-autonomous nutrient (glucose and amino acid) transporter expression. Blocking Rab7 in growth-factor-deprived cells prevents clearance of nutrient transporters from the cell surface, sustaining mitochondrial membrane potential and growth-factor-independent survival; dominant-negative Rab7 cooperated with E1A for transformation of p53-/- MEFs.\",\n      \"method\": \"Dominant-negative Rab7 expression; nutrient transporter surface levels; mitochondrial membrane potential measurement; transformation assay in MEFs\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function with defined molecular and cellular readouts, single lab, multiple assays\",\n      \"pmids\": [\"14536059\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Rab7 controls retrograde axonal transport by marking a specific pool of carriers that transport neurotrophins (BDNF), their receptors (TrkB, p75NTR), and tetanus neurotoxin fragment. Rab5 is essential for an early sorting step but is absent from axonally transported vesicles.\",\n      \"method\": \"Purification of retrogradely transported vesicles using paramagnetic bead-conjugated tetanus neurotoxin fragment; identification of Rab7 by MS; functional validation with Rab5/Rab7 dominant-negatives\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — biochemical purification combined with functional dominant-negative epistasis, multiple cargo readouts\",\n      \"pmids\": [\"17046692\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Rab7 associates with early and intermediate stage melanosomes and controls microtubule-mediated (dynein/RILP-dependent) transport of these early melanosomes, while mature melanosomes lose Rab7 and instead use Rab27a-myosin Va for actin-dependent transport.\",\n      \"method\": \"Immunofluorescence colocalization of Rab7 and Rab27a with melanosome stages; functional analysis of motor protein recruitment\",\n      \"journal\": \"Pigment cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — colocalization across defined melanosome maturation stages, mechanistic pathway placement, single lab\",\n      \"pmids\": [\"16965270\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"CMT2B-associated Rab7 mutant proteins (L129F, K157N, V162M) exhibit higher nucleotide exchange rates and slower GTP hydrolysis than wild-type Rab7, resulting in 82-89% GTP-bound form in cells vs. 23% for wild type. These mutants bind the Rab7 effector RILP and can rescue Rab7 function after silencing, demonstrating gain-of-function through hyperactivation.\",\n      \"method\": \"In vitro GTP hydrolysis assays; nucleotide exchange rate measurements; GTP-bound fraction determination in HeLa cells; RILP binding assay; siRNA rescue experiments\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro biochemical assays plus cellular validation with multiple orthogonal methods across three mutants\",\n      \"pmids\": [\"18272684\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Rubicon and PLEKHM1 negatively regulate the endocytic/autophagic pathway via a novel C-terminal RH domain that directly and specifically interacts with Rab7. This interaction is critical for their regulatory functions. Rubicon, but not PLEKHM1, also simultaneously binds PI3-kinase to regulate trafficking.\",\n      \"method\": \"Database-based homology identification; GST pull-down; co-immunoprecipitation; dominant-negative Rab7 epistasis; pathway readouts for endocytic and autophagic flux\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct binding confirmed by pull-down and co-IP, with functional epistasis showing RH domain requirement\",\n      \"pmids\": [\"20943950\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"CMT2B-associated Rab7 mutants inhibit neurite outgrowth in PC12 and Neuro2A cells, as demonstrated by reduced GAP43 upregulation and NeuN expression. The inhibition phenocopies constitutively active Rab7Q67L, consistent with gain-of-function hyperactivation.\",\n      \"method\": \"Expression of CMT2B Rab7 mutants and constitutively active Rab7 in PC12 and Neuro2A cells; neurite outgrowth measurement; GAP43 and NeuN biochemical quantification\",\n      \"journal\": \"Acta neuropathologica\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean gain-of-function phenotype in two cell lines with biochemical markers, single lab\",\n      \"pmids\": [\"20464402\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"CMT2B Rab7 mutants enhance NGF-stimulated TrkA phosphorylation, increase Erk1/2 signaling from endosomes, and reduce nuclear shuttling of phospho-Erk1/2, thereby decreasing downstream nuclear transcription (MAPK phosphatase expression) and explaining inhibition of neurite outgrowth.\",\n      \"method\": \"Rab7 CMT2B mutant expression in PC12 cells; TrkA co-immunoprecipitation; phosphorylation assays for TrkA, Akt, Erk1/2; nuclear fractionation\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP and multiple signaling readouts, single lab\",\n      \"pmids\": [\"21151572\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"CMT2B Rab7 mutants delay EGF trafficking to LAMP1-positive late endosomes/lysosomes, slow EGFR degradation, enhance and prolong EGFR signaling and p38/ERK1/2 phosphorylation, but reduce nuclear translocation of p38/ERK1/2, thereby decreasing downstream nuclear activation of Elk-1 and immediate early genes.\",\n      \"method\": \"EGF trafficking assays in three cell lines; EGFR degradation assays; phospho-signaling Western blots; nuclear fractionation; Elk-1 transcriptional reporter assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal functional assays across three cell lines, single lab\",\n      \"pmids\": [\"23188822\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"RAB7A directly interacts with vimentin (identified by yeast two-hybrid and confirmed by co-immunoprecipitation and pull-down with recombinant proteins). Overexpression of Rab7a increases vimentin phosphorylation and shifts vimentin to the soluble fraction; Rab7a silencing increases vimentin in the insoluble (assembled) fraction. CMT2B Rab7a mutants also increase soluble vimentin.\",\n      \"method\": \"Yeast two-hybrid; co-immunoprecipitation; GST pull-down with bacterially expressed recombinant proteins; immunofluorescence; subcellular fractionation\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct interaction confirmed by reconstitution with recombinant proteins, plus orthogonal cellular functional assays\",\n      \"pmids\": [\"23458836\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"CMT2B Rab7 mutants dysregulate axonal transport (increased anterograde velocity and fraction), cause premature degradation of TrkA (reducing surface TrkA and NGF binding), and markedly impair NGF-induced Erk1/2 activation and PC12 cell differentiation, leading to axonal degeneration in DRG neurons.\",\n      \"method\": \"Live axonal transport imaging in E15.5 rat DRG neurons; surface TrkA measurement by flow cytometry; NGF binding assay; Erk1/2 phosphorylation; siRNA knockdown of Rab7\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — live imaging plus multiple functional assays, single lab\",\n      \"pmids\": [\"23616551\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Drosophila CMT2B rab7 mutants retain 10-50% function and cause neurodegeneration through partial loss of function (not gain of function). Loss of rab7 causes adult-onset neurodegeneration; overexpression of CMT2B mutants does not impair endosomal maturation but reduces efficient endosome recruitment.\",\n      \"method\": \"In vivo quantitative imaging, electrophysiology, and rescue experiments in Drosophila sensory and motor neurons; live endosome imaging\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple in vivo assays in Drosophila model, but contradicts other labs' gain-of-function interpretation\",\n      \"pmids\": [\"24327558\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"RAB7A directly interacts with peripherin, a neuronal intermediate filament protein expressed primarily in peripheral neurons, via direct binding confirmed with recombinant proteins. CMT2B RAB7A mutants bind peripherin more strongly and alter its solubility, suggesting this interaction contributes to the neuronal specificity of CMT2B.\",\n      \"method\": \"Yeast two-hybrid screen with DRG cDNA library; co-immunoprecipitation; pull-down with recombinant proteins; siRNA knockdown and overexpression of RAB7A with peripherin solubility assay\",\n      \"journal\": \"Acta neuropathologica\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct binding established with recombinant proteins plus orthogonal cellular assays, single lab\",\n      \"pmids\": [\"23179371\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"LKB1 kinase functions as a RAB7 effector, specifically binding GTP-bound RAB7 (not GDP-bound dominant-negative RAB7), and promotes formation of a complex between NRP-1 and RAB7 in late endosomes to facilitate lysosomal degradation of neuropilin-1 (NRP-1) and suppress angiogenesis.\",\n      \"method\": \"Co-immunoprecipitation of LKB1 with GTP- vs. GDP-bound RAB7 forms; RAB7 siRNA depletion and NRP-1 trafficking rescue; LKB1-NRP-1-RAB7 complex formation assays\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — GTP-dependent co-IP and siRNA loss-of-function with defined cargo readout, single lab\",\n      \"pmids\": [\"25180605\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"DEF8 interacts with PLEKHM1 and promotes its binding to RAB7; FAM98A and NDEL1 interact with PLEKHM1 to connect lysosomes to microtubules. Loss of PLEKHM1, DEF8, FAM98A, or NDEL1 impairs peripheral lysosome distribution and bone resorption in osteoclasts via RAB7.\",\n      \"method\": \"Co-immunoprecipitation; germline and conditional Plekhm1 knockout mice; lysosome positioning assays in osteoclasts; bone resorption assay\",\n      \"journal\": \"JCI insight\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP and in vivo KO with defined functional readouts, single lab\",\n      \"pmids\": [\"27777970\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Rab7a depletion causes slower cell migration, impaired cell adhesion and spreading on fibronectin, reduced β1-integrin activation and trafficking, decreased active Rac1 levels, and loss of properly oriented vimentin filaments during migration.\",\n      \"method\": \"siRNA knockdown of Rab7a in NCI H1299 cells; migration velocity and directness quantification; fibronectin adhesion/spreading assay; Rac1 activity (pull-down assay); β1-integrin localization and activation\",\n      \"journal\": \"Biochimica et biophysica acta. Molecular cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean siRNA KD with multiple orthogonal phenotypic readouts and pathway markers, single lab\",\n      \"pmids\": [\"27888097\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Vps34 PI3K produces PI(3)P required to recruit the Rab7 GAP Armus (TBC1D2) to late endosomes. In Vps34-/- MEFs, failure to recruit Armus leads to hyperactivated Rab7 (elevated Rab7-GTP), enlarged late endosomes, failed ILV formation, and decreased EGFR degradation. Rab7 silencing or Armus overexpression rescues vacuolization.\",\n      \"method\": \"Vps34 knockout MEFs; Rab7-GTP pull-down assay; protein-lipid overlay and liposome binding assays for Armus-PI(3)P interaction; Rab7 siRNA rescue\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — KO cells plus biochemical lipid binding assays plus genetic rescue with defined molecular mechanism\",\n      \"pmids\": [\"27793976\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Rab7 is tyrosine-phosphorylated by Src kinase at Y183. This phosphorylation depends on Rab7's guanine nucleotide binding activity and Src kinase activity, is induced by EGF stimulation, and impairs Rab7 interaction with RILP, thereby inhibiting EGFR degradation and sustaining Akt signaling.\",\n      \"method\": \"In vitro Src kinase assay with Rab7; site-directed mutagenesis (Y183F); co-immunoprecipitation; EGF stimulation; EGFR degradation assay; Akt signaling readout\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro kinase assay plus mutagenesis plus functional consequences on effector binding and cargo degradation, single lab\",\n      \"pmids\": [\"28336235\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"WDR91 is a Rab7 effector that couples Rab switching with PI(3)P down-regulation on endosomes. WDR91 is recruited to endosomes by active GTP-Rab7 and inhibits Rab7-associated PI3K activity. Loss of WDR91 increases endosomal PI(3)P, arrests endosome maturation, and impairs neurite development in mouse neurons.\",\n      \"method\": \"Co-immunoprecipitation and pull-down of WDR91 with GTP-Rab7; Wdr91 knockout mice (global and brain-specific); PI(3)P measurement; endosome maturation assays; neurite complexity quantification; rescue with WDR91 vs. Rab7-binding mutants\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP, multiple knockout models, functional rescue with binding-deficient mutant establishing specificity\",\n      \"pmids\": [\"28860274\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"CD44s (CD44 short isoform) is internalized into endosomes and interacts with Rab7A to inhibit Rab7A-mediated EGFR trafficking to lysosomes and subsequent EGFR degradation.\",\n      \"method\": \"Co-immunoprecipitation; EGFR trafficking and degradation assays; siRNA knockdown of Rab7A\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP and functional trafficking assay, single lab\",\n      \"pmids\": [\"28716909\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Rab7A regulates tau secretion: deletion of Rab7A decreases tau secretion, dominant-negative Rab7A decreases it, and constitutively active Rab7A increases it. Partial colocalization of tau with Rab7-positive structures indicates late endosomal involvement in tau secretion.\",\n      \"method\": \"Rab7A knockout and dominant-negative/constitutively active mutant expression in neurons and HeLa cells; tau secretion measurement; immunofluorescence colocalization\",\n      \"journal\": \"Journal of neurochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain- and loss-of-function with consistent directional readouts, two cell systems, single lab\",\n      \"pmids\": [\"28222213\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Retromer recruitment to endosomes requires binding to Rab7a. Inhibition of the Rab7a GAP TBC1D5 enhances Rab7a activation and leads to gain of retromer function (improved endosome-to-Golgi retrieval).\",\n      \"method\": \"TBC1D5 inhibition/knockdown; Rab7a activation state assay; retromer cargo retrieval assays\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional epistasis with retromer cargo readouts, single lab\",\n      \"pmids\": [\"29777037\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Mitochondria-lysosome membrane contact sites form dynamically in healthy cells and are regulated by RAB7 GTP hydrolysis: active GTP-bound lysosomal RAB7 promotes contact formation, while contact untethering requires recruitment of the RAB7 GAP TBC1D15 to mitochondria via FIS1 to drive RAB7 GTP hydrolysis. Lysosomal contacts mark sites of mitochondrial fission.\",\n      \"method\": \"Electron microscopy, structured illumination microscopy, high-resolution confocal live-cell imaging; TBC1D15 and FIS1 recruitment assays; Rab7 GTP/GDP state manipulation; mitochondrial fission readouts\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — multiple orthogonal imaging modalities plus mechanistic dissection of GTP hydrolysis cycle and functional consequence on mitochondrial fission\",\n      \"pmids\": [\"29364868\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"TBK1 directly phosphorylates RAB7A at Ser72 upon mitochondrial depolarization in a PARKIN-dependent manner. Phospho-RAB7A(S72) loses association with RAB GDI, gains association with FLCN-FNIP1 (a DENN domain-containing GEF heterodimer), and is required for ATG9A recruitment to damaged mitochondria and efficient mitophagy.\",\n      \"method\": \"Global quantitative phosphoproteomics; in vitro TBK1 kinase assay; interaction proteomics with phosphomimetic (S72E) and non-phosphorylatable (S72A) RAB7A mutants; mitophagy flux assay; ATG9A recruitment imaging\",\n      \"journal\": \"Science advances\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro kinase assay combined with quantitative proteomics, phosphomimetic/phosphodead mutant analysis, and functional mitophagy readout\",\n      \"pmids\": [\"30627666\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Retromer-associated RAB7-specific GAP TBC1D5 controls RAB7 activity and localization; in absence of TBC1D5 or retromer, RAB7 hyperactivates and expands over the entire lysosomal domain. RAB7 also localizes to ER, trans-Golgi network, and mitochondrial membranes in a retromer/TBC1D5-dependent manner. Hyperactivated RAB7 disrupts ATG9a sorting and autophagosome formation around damaged mitochondria during Parkin-mediated mitophagy.\",\n      \"method\": \"TBC1D5 and retromer subunit KO cells; RAB7 localization by fluorescence microscopy; RAB7 mobility by FRAP; ATG9a sorting assay; mitophagy induction with CCCP\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple KO cell lines, FRAP, functional mitophagy readouts, multiple organelle markers\",\n      \"pmids\": [\"29158324\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Endosomal PI4P (produced primarily by PI4K2A) is required for Rab7 cycling on late endosomes; acute conversion of endosomal PI4P to PI(4,5)P2 causes Rab7 dissociation from late endosomes and releases PLEKHM1. PI4K2A deletion impairs PI(4,5)P2 production, causing defective Rab7 inactivation and increased autophagic structures with impaired autophagosome-lysosome fusion. Rab7 effectors Vps35 and RILP are not affected by acute PI(4,5)P2 production.\",\n      \"method\": \"Acute PI4P-to-PI(4,5)P2 conversion system; PI4K2A deletion; live-cell imaging of Rab7 and PLEKHM1 dynamics; LC3 structure quantification; autophagosome-lysosome fusion assay\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — acute lipid manipulation plus genetic KO with multiple orthogonal readouts, single lab\",\n      \"pmids\": [\"31368593\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"TBK1/IKKε phosphorylate RAB7 at S72 (same site as TBK1 in mitophagy context). Phosphomimetic RAB7-S72E shows diffuse cytosolic localization and enhanced innate immune signaling (STING pathway), while kinase-resistant RAB7-S72A localizes to active puncta promoting lysosomal STING degradation. Thus, RAB7-S72 phosphorylation limits STING turnover, increasing IRF3 target production.\",\n      \"method\": \"SILAC phosphoproteomics for substrate identification; phosphomimetic and phosphodead RAB7 mutants in TNBC cells; RAB7 localization imaging; STING levels and IRF3 targets (CXCL10, CCL5, IFNβ) measurement\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — phosphoproteomics plus functional mutant analysis, single lab, consistent with PMID 30627666\",\n      \"pmids\": [\"31662325\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Rab7 depletion potently induces spontaneous ciliogenesis and cilia elongation and blocks serum-induced ciliary resorption. Active Rab7 is required for cilia disassembly via cilia tip excision (ectocytosis), which depends on F-actin polymerization at the excision site; Rab7 depletion prevents this F-actin polymerization.\",\n      \"method\": \"Rab7 siRNA knockdown; cilia length and number quantification; serum-induced cilia resorption assay; live imaging of cilia ectocytosis; F-actin staining at cilia tips; constitutively active Rab7 expression\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA KD with active mutant confirmation and mechanistic F-actin readout, single lab\",\n      \"pmids\": [\"31619485\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"PIPKIγi5 (type Igamma PI4,5P2-kinase isoform 5) directly interacts with Rab7a and is required for Rab7a recruitment to early endosomes. Loss of PIPKIγi5 blocks early-to-late endosome maturation, disrupts retromer-Rab7a connection (preventing CI-M6PR retrograde sorting and hydrolase delivery to lysosomes), and blocks recruitment of Rab7a GAP TBC1D5 to late endosomes.\",\n      \"method\": \"Co-immunoprecipitation; PIPKIγi5 knockdown; Rab7a localization assay; retromer recruitment; CI-M6PR trafficking; autophagic degradation assay\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP plus loss-of-function with multiple pathway readouts, single lab\",\n      \"pmids\": [\"31908013\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Active Rab7 directly interacts with the NPC1 cholesterol transporter to license lysosomal cholesterol export. C18orf8 is a core subunit of the trimeric Mon1-Ccz1-C18orf8 (MCC) GEF complex required for Rab7 activation; C18orf8 deficiency abolishes Rab7 activation, disrupts late endosome morphology, and causes free cholesterol accumulation in swollen lysosomes (NPC1-like phenotype). A constitutively active Rab7 restores cholesterol export in MCC-deficient cells.\",\n      \"method\": \"Genome-wide CRISPR screen; co-immunoprecipitation of active Rab7 with NPC1; C18orf8, Ccz1, Mon1 deficiency by CRISPR; constitutively active Rab7 rescue; cholesterol trafficking assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genome-wide functional screen, multiple GEF subunit KOs with rescue by active Rab7, direct interaction shown by co-IP\",\n      \"pmids\": [\"33144569\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"CLN3 regulates endosomal function by modulating Rab7A-effector interactions: CLN3 is required for efficient Rab7A interaction with retromer (for endosome-to-TGN trafficking of lysosomal sorting receptors) and with PLEKHM1 (required for autophagosome-lysosome fusion). Loss of CLN3 or disease-causing CLN3 mutations cause degradation of lysosomal sorting receptors.\",\n      \"method\": \"Co-immunoprecipitation in live cells; CLN3 knockout and disease-mutation expression; lysosomal sorting receptor trafficking assay; autophagosome-lysosome fusion assay\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP plus KO with multiple functional readouts, single lab\",\n      \"pmids\": [\"32034082\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"C5orf51 (RMC1) is a specific interactor of GDP-locked RAB7A and a component of the MON1-CCZ1 GEF complex. In absence of C5orf51, RAB7A localization on depolarized mitochondria is compromised and RAB7A is degraded by the proteasome. C5orf51 depletion also inhibits ATG9A recruitment to depolarized mitochondria.\",\n      \"method\": \"Proximity-dependent biotinylation (miniTurbo) with GDP-locked RAB7A; C5orf51 co-immunoprecipitation with MON1/CCZ1; C5orf51 KO cells; RAB7A stability and localization assay on depolarized mitochondria; ATG9A recruitment assay\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — proximity proteomics plus co-IP plus KO with functional readouts, single lab\",\n      \"pmids\": [\"34432599\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Crystal structure of human PDZD8 coiled-coil domain in complex with GTP-bound Rab7 reveals that two Rab7 molecules bind the opposite sides of the PDZD8 CC in a 2:1 ratio, with the switch I/II and interswitch regions forming the binding interface, consistent with GTP-dependent ER-late endosome tethering.\",\n      \"method\": \"Crystal structure determination; isothermal titration calorimetry (ITC); mutational analysis of binding interface; GTP-dependence validation\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure plus ITC quantification of binding stoichiometry, direct structural validation of GTP-dependence\",\n      \"pmids\": [\"34552186\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"RAB7 activity is required for mitophagy in oocyte meiosis. PRKN (Parkin) ubiquitinates and degrades RAB7A and its GEF complex (CCZ1-MON1) through the ubiquitin-proteasome system, thereby limiting mitophagy. Active RAB7A (Q67L) or RAB7 activator ML098 rescues mitophagy defects and meiotic blockade caused by CCCP.\",\n      \"method\": \"mRNA microinjection of RAB7Q67L in oocytes; ML098 treatment; CCCP-induced mitophagy; meiosis stage imaging; PINK1/PRKN/RAB7 protein level measurement; ubiquitin-proteasome inhibition rescue\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain-of-function rescue and pharmacological activation with mechanistic ubiquitin-proteasome pathway placement, single lab\",\n      \"pmids\": [\"34229552\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"RAB7A regulates vimentin phosphorylation through AKT and PAK1 kinases. RAB7A overexpression increases vimentin phosphorylation at Ser38 via AKT activity. RAB7A modulation also affects downstream effectors: β-catenin, caspase 9 expression, cofilin-1, and MMP2 activity.\",\n      \"method\": \"RAB7A overexpression and siRNA knockdown; AKT and PAK1 activity assays; vimentin phospho-site specific antibodies; beta-catenin, caspase 9, cofilin-1 Western blots; MMP2 zymography\",\n      \"journal\": \"Cancers\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain- and loss-of-function with kinase activity readouts, single lab\",\n      \"pmids\": [\"34066419\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"TBK1 phosphorylation of RAB7A at S72 functions as a phosphoswitch during Parkin-dependent mitophagy: phospho-RAB7A abrogates binding to Rubicon (a negative autophagy regulator with RH domain), while Pacer (a positive regulator with RH domain) specifically binds phospho-RAB7A. In vitro TBK1 phosphorylation of RAB7A blocks Rubicon:RAB7A binding; Pacer knockout reduces Parkin mitophagy but not bulk autophagy; rescue requires an intact phosphate-binding basic triad in Pacer.\",\n      \"method\": \"Crystal structure of Rubicon:RAB7A complex; in vitro TBK1 phosphorylation; co-immunoprecipitation of Rubicon/Pacer with pRAB7A; Pacer KO cells; Parkin mitophagy assay; rescue with Pacer phosphate-binding mutant\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure plus in vitro phosphorylation assay plus KO plus structure-informed rescue, multiple orthogonal methods\",\n      \"pmids\": [\"38728007\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"SIRT5-catalyzed desuccinylation of RAB7A at lysine 31 is required for RAB7A activity. Cadmium exposure decreases SIRT5 expression, increasing RAB7A succinylation at K31 and inhibiting RAB7A activity, thereby blocking autophagosome-lysosome fusion and autophagic clearance. SIRT5 overexpression restores RAB7A activity and autophagic flux.\",\n      \"method\": \"Proteomic identification of succinylation site; SIRT5 overexpression and knockdown; RAB7A activity assays; autophagosome-lysosome fusion assay; in vivo FAD4T mouse model\",\n      \"journal\": \"Advanced science (Weinheim, Baden-Wurttemberg, Germany)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — proteomic identification of PTM site plus gain/loss-of-function in vitro and in vivo, single lab\",\n      \"pmids\": [\"38837686\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"SARS-CoV-2 ORF3a, in complex with Vps39, sequesters the Rab7 GAP TBC1D5, preventing GTP hydrolysis and causing Rab7 hyperactivation. Hyperactive Rab7 impairs CI-M6PR retrieval from late endosomes to TGN, disrupts lysosomal hydrolase delivery, reduces Rab7-Arl8b compartment tethering, and promotes viral egress. The Rab7 GDP-locked mutant strongly reduces viral replication.\",\n      \"method\": \"SARS-CoV-2 infection and ORF3a expression; co-immunoprecipitation of ORF3a-Vps39-TBC1D5; Rab7 activation state assay; CI-M6PR trafficking; lysosomal hydrolase delivery assay; Rab7 GDP mutant viral replication assay\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple co-IP interactions, functional cargo trafficking assays, viral genetic rescue, consistent mechanism across ORF3a variants\",\n      \"pmids\": [\"38448435\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"TBK1 is recruited to lysosomes in response to elevated amino acid levels, where it phosphorylates Rab7 at S72 to alleviate Rab7-mediated inhibition of amino acid-dependent mTORC1 activation. An ALS/FTD-associated TBK1 E696K mutant constitutively accumulates at lysosomes, causing elevated Rab7 S72 phosphorylation and increased mTORC1 activation.\",\n      \"method\": \"Lysosomal TBK1 fractionation; Rab7 S72 phosphorylation assay under amino acid conditions; mTORC1 activation readout; TBK1 E696K mutant analysis\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — fractionation plus phosphorylation and mTORC1 readouts, disease mutant validation, single lab\",\n      \"pmids\": [\"39103493\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"USP4 deubiquitinase maintains RAB7A in an active deubiquitinated state; reduced USP4 in periodontitis leads to RAB7A ubiquitination, impairing lysosomal trafficking and autophagosome-lysosome fusion. RAB7A inactivation directly reduces autophagy efficiency and drives periodontitis progression.\",\n      \"method\": \"Proteomics identification of USP4-RAB7A interaction; USP4 and RAB7A knockdown/overexpression; ubiquitination assay; autophagosome-lysosome fusion assay; experimental periodontitis mouse model\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — proteomics plus ubiquitination assay plus in vivo model, single lab\",\n      \"pmids\": [\"39663592\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Rab7A is required for efficient HIV-1 production. Rab7A depletion by siRNA impairs Env glycoprotein processing, reduces incorporation of mature Env into viral particles, decreases HIV-1 infectivity, and induces a BST2/Tetherin-like phenotype on HIV-1 release, suggesting Rab7A contributes to the mechanism by which Vpu counteracts BST2/Tetherin.\",\n      \"method\": \"RNA interference targeting Rab7A; virological assays (Env processing, viral particle infectivity); BST2/Tetherin release assay\",\n      \"journal\": \"PLoS pathogens\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA KD with multiple virological readouts, single lab\",\n      \"pmids\": [\"22072966\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Rab7a and Rab27b control microRNA (miR-143) secretion through extracellular vesicles in shear-stressed endothelial cells, in a KLF2-dependent manner.\",\n      \"method\": \"siRNA knockdown of Rab7a and Rab27b; miR-143 secretion measurement in extracellular vesicle fractions; KLF2 pathway context\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single KD experiment, single lab, limited mechanistic detail in abstract\",\n      \"pmids\": [\"26348397\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Rab7a is required for degradation of dendritic cargo proteins (Nsg1, Nsg2): Rab7 activity mobilizes distal pre-degradative late endosomes for retrograde transport to the soma for terminal lysosomal degradation. Most dendritic LAMP1 endosomes are not degradative lysosomes.\",\n      \"method\": \"Rab7 dominant-negative expression in neurons; live imaging of late endosomes; degradation assay for Nsg1/Nsg2; colocalization of LAMP1 with CatB/D\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — dominant-negative loss-of-function with cargo-specific degradation readout and live imaging, single lab\",\n      \"pmids\": [\"29907658\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Dynein motor activity is required for Rab7-dependent retrograde transport of late endosomes in dendrites and for endosome maturation. Inhibiting dynein (directly or via RILP C-terminus expression) delays somatic endosome maturation (evidenced by excess Rab7 accumulation) and inhibits degradation of dendritic cargos. Rab7 GDP-GTP cycling appears necessary for late endosome fusion with lysosomes subsequent to somatic arrival.\",\n      \"method\": \"Multiple dynein/dynactin inhibition approaches (drugs, RILP C-terminus dominant negative); quantitative live imaging of late endosomes in dendrites; cargo degradation assays in hippocampal neurons\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple inhibition approaches with consistent readouts, single lab\",\n      \"pmids\": [\"35474277\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Rab7 GTPase directly interacts with mTOR at its N-terminal heat repeat domain. Rab7 GTPase knockdown in LAL-deficient myeloid cells reverses altered lysosome/mTOR distribution, reduces mTOR hyperactivation, and decreases downstream S6 phosphorylation, glucose consumption, and ROS production.\",\n      \"method\": \"Co-immunoprecipitation; GST pull-down with recombinant GST-Rab7 fusion protein; siRNA knockdown; lysosome distribution and mTOR co-localization; metabolic assays\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — GST pull-down with recombinant protein plus co-IP and functional siRNA KD readouts, single lab\",\n      \"pmids\": [\"28415797\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"RAB7A is a small GTPase that cycles between GTP-bound (active) and GDP-bound (inactive) states to orchestrate multiple aspects of the endolysosomal system: it controls early-to-late endosome maturation, recruits effectors (RILP, FYCO1, retromer, WDR91, PLEKHM1, Rubicon/Pacer) to regulate late endosome motility, fusion with lysosomes, and lysosomal biogenesis; active GTP-RAB7 promotes mitochondria-lysosome contact formation and marks sites of mitochondrial fission, while GTP hydrolysis (driven by GAPs TBC1D5, Armus/TBC1D2, and TBC1D15 recruited via FIS1) releases these contacts; RAB7A is phosphorylated at S72 by TBK1 (and IKKε) in a PARKIN-dependent manner to switch effector preference from Rubicon (negative regulator) to Pacer (positive regulator), enabling Parkin-dependent mitophagy and ATG9A recruitment; RAB7A is also tyrosine-phosphorylated by Src at Y183, impairing RILP binding and EGFR degradation; RAB7A is succinylated at K31 (reversed by SIRT5) and ubiquitinated (reversed by USP4) as additional post-translational regulatory mechanisms; the GEF complex Mon1-Ccz1-C18orf8 activates RAB7A to enable NPC1-dependent lysosomal cholesterol export; in neurons, RAB7A controls retrograde axonal transport of neurotrophin-signaling endosomes and axonal integrity, and CMT2B-causing missense mutations hyperactivate RAB7A (elevated GTP loading, slower hydrolysis), altering effector interactions and perturbing NGF/TrkA and EGFR trafficking and signaling.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"RAB7A is a small GTPase that acts as the master organizer of the endolysosomal system, cycling between GTP-bound (active) and GDP-bound (inactive) states to control late endosome maturation, motility, and fusion with lysosomes [#0]. Active GTP-RAB7A recruits a diverse set of effectors from the cytosol to late endosomal membranes — including the RING-finger protein Rabring7 [#4], the RH-domain proteins Rubicon and PLEKHM1 [#9], WDR91 [#22], LKB1 [#17], and retromer [#25] — to govern cargo degradation, endosome-to-Golgi retrieval, and autophagic flux, while motor-adaptor coupling through RILP and dynein directs microtubule-based retrograde transport [#7, #47]. Its activation cycle is set by upstream regulators: the Mon1-Ccz1-C18orf8/RMC1 GEF complex loads GTP to license RAB7A function including NPC1-dependent lysosomal cholesterol export [#33, #35], whereas GAPs TBC1D5, Armus/TBC1D2, and TBC1D15 drive GTP hydrolysis to inactivate RAB7A and restrict its membrane domain [#20, #26, #28]. RAB7A also coordinates membrane contact sites, directly binding the ER tether PDZD8 and promoting mitochondria-lysosome contacts whose untethering requires FIS1-recruited TBC1D15-driven GTP hydrolysis, with these contacts marking sites of mitochondrial fission [#26, #36]. A layer of post-translational control tunes effector choice and activity: TBK1 (and IKKε) phosphorylate RAB7A at Ser72 to switch effector preference from the inhibitory Rubicon to the activating Pacer, enabling Parkin-dependent mitophagy and ATG9A recruitment [#27, #39], while Src-mediated Tyr183 phosphorylation impairs RILP binding and slows EGFR degradation [#21]; succinylation at Lys31 (reversed by SIRT5) [#40] and ubiquitination (reversed by USP4) [#43] further regulate RAB7A activity and autophagic clearance. In neurons RAB7A marks retrograde carriers transporting neurotrophins and their receptors and maintains axonal and dendritic cargo degradation [#6, #46], and CMT2B-causing missense mutations hyperactivate RAB7A — elevating GTP loading and slowing hydrolysis — to perturb NGF/TrkA and EGFR trafficking and signaling and to drive neurodegeneration [#8, #14].\",\n  \"teleology\": [\n    {\n      \"year\": 2000,\n      \"claim\": \"Established RAB7A as the GTPase controlling late endosome/lysosome fusion and maintenance of the perinuclear lysosomal compartment, defining its core cellular role.\",\n      \"evidence\": \"Dominant-negative and constitutively active EGFP-Rab7 mutants in HeLa cells scored against lysosomal morphology, acidification, and cargo access\",\n      \"pmids\": [\"10679007\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not identify the effectors mediating fusion\", \"Upstream activation machinery unknown\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Connected RAB7A to phosphoinositide signaling and placed it downstream of Rab5 in the maturation cascade, showing nucleotide cycling drives effector engagement on late endosomes.\",\n      \"evidence\": \"Co-IP and PI3K activity assays linking hVPS34/p150 to Rab7; genetic epistasis with dominant-negative Rab5/Rab7 on phagosomes; identification of the GTP-specific effector Rabring7\",\n      \"pmids\": [\"14617358\", \"12640132\", \"12972561\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct GEF/GAP identities not yet defined\", \"Causal direction between PI(3)P and Rab7 activity unresolved at this stage\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Extended RAB7A function beyond canonical degradation to virus entry and to cell-autonomous nutrient transporter clearance/apoptosis, broadening its physiological reach.\",\n      \"evidence\": \"Dominant-negative Rab7 blocking influenza late-endosomal entry; loss-of-function effects on surface nutrient transporters and survival in growth-factor-deprived cells\",\n      \"pmids\": [\"12713661\", \"14536059\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Effectors mediating these specialized roles not defined\", \"Mechanism of transporter retention versus degradation unresolved\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Defined RAB7A as the marker of retrograde axonal carriers and stage-specific organelle transport, showing it couples cargo identity to dynein/RILP-based motility.\",\n      \"evidence\": \"Biochemical purification of retrograde neurotrophin vesicles identifying Rab7 by MS, plus dominant-negative epistasis; colocalization across melanosome maturation stages\",\n      \"pmids\": [\"17046692\", \"16965270\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Quantitative contribution of RAB7A versus other GTPases to transport unclear\", \"How Rab7 selects specific cargo pools unknown\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Established the molecular basis of CMT2B disease as RAB7A hyperactivation — elevated nucleotide exchange and slowed hydrolysis producing a predominantly GTP-bound mutant that retains effector binding.\",\n      \"evidence\": \"In vitro GTP hydrolysis and exchange assays, cellular GTP-bound fraction measurement, RILP binding, and siRNA rescue across L129F/K157N/V162M mutants\",\n      \"pmids\": [\"18272684\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How hyperactivation translates to neuron-specific degeneration not addressed here\", \"Effector rewiring downstream of hyperactivation not mapped\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Linked CMT2B RAB7A hyperactivation to neuronal phenotypes and identified the RH-domain effectors Rubicon/PLEKHM1, expanding the effector repertoire and tying gain-of-function to neurite defects.\",\n      \"evidence\": \"Neurite outgrowth assays in PC12/Neuro2A with CMT2B and Q67L mutants; GST pull-down and co-IP defining the RH-domain Rab7 interaction\",\n      \"pmids\": [\"20464402\", \"20943950\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Causal chain from effector binding to outgrowth not fully resolved\", \"Whether RH-domain effectors mediate the CMT2B phenotype untested\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Showed CMT2B mutants distort growth-factor receptor trafficking and signaling, slowing TrkA/EGFR degradation while paradoxically reducing nuclear signal delivery, providing a signaling mechanism for disease.\",\n      \"evidence\": \"Co-IP, phospho-signaling Westerns, nuclear fractionation, and transcriptional reporters in PC12 cells and multiple lines tracking TrkA, EGFR, Erk1/2, p38, and Elk-1\",\n      \"pmids\": [\"21151572\", \"23188822\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab signaling readouts\", \"Relative contribution of TrkA versus EGFR defects to neuropathy unresolved\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Connected RAB7A to the intermediate filament cytoskeleton, identifying direct binding to vimentin and peripherin and a role in filament solubility, hinting at the neuronal specificity of CMT2B.\",\n      \"evidence\": \"Yeast two-hybrid, co-IP, and pull-downs with recombinant proteins; solubility fractionation with wild-type and CMT2B mutants\",\n      \"pmids\": [\"23458836\", \"23179371\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism linking filament solubility to endosomal function unclear\", \"Whether filament binding is GTP-dependent not established\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Tested CMT2B disease mechanism in vivo and in primary neurons, with one model supporting gain-of-function signaling/transport defects and another arguing for partial loss of function, exposing a mechanistic divergence.\",\n      \"evidence\": \"Live axonal transport imaging and TrkA/NGF assays in rat DRG neurons; quantitative imaging, electrophysiology, and rescue in Drosophila neurons\",\n      \"pmids\": [\"23616551\", \"24327558\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Gain- versus loss-of-function interpretation unreconciled across systems\", \"Species and assay differences may confound the comparison\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Identified additional GTP-specific effectors and cargo-degradation roles, including LKB1-mediated NRP-1 degradation, embedding RAB7A in angiogenesis control.\",\n      \"evidence\": \"GTP- versus GDP-specific co-IP of LKB1 and siRNA rescue of NRP-1 trafficking\",\n      \"pmids\": [\"25180605\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab effector assignment\", \"Generalizability beyond NRP-1 untested\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Resolved the lipid logic of RAB7A inactivation and effector scaffolding, showing Vps34-derived PI(3)P recruits the GAP Armus to switch off Rab7, and that adaptor complexes link Rab7-lysosomes to microtubules for cell-type functions like bone resorption.\",\n      \"evidence\": \"Vps34-KO MEFs with Rab7-GTP pull-downs and lipid-binding assays; co-IP and conditional Plekhm1-KO mice with lysosome positioning and bone resorption readouts; siRNA effects on migration and integrin/Rac1 signaling\",\n      \"pmids\": [\"27793976\", \"27777970\", \"27888097\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How PI(3)P spatially restricts Armus to specific endosomes incompletely defined\", \"Coordination of GEF and GAP lipid cues unresolved\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Defined a multi-layered control of the RAB7A cycle: tyrosine phosphorylation by Src tuning effector binding, retromer/TBC1D5-dependent restriction of the active Rab7 domain, and WDR91 coupling Rab switching to PI(3)P down-regulation.\",\n      \"evidence\": \"In vitro Src kinase assay with Y183F mutagenesis; TBC1D5/retromer-KO cells with FRAP and organelle markers; WDR91 reciprocal co-IP, knockout mice, and binding-mutant rescue\",\n      \"pmids\": [\"28336235\", \"29158324\", \"28860274\", \"29777037\", \"28716909\", \"28222213\", \"28415797\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Integration of multiple PTMs and GAPs onto a single Rab7 pool unresolved\", \"Crosstalk between Src, retromer, and lipid cues not jointly tested\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Established the Ser72 phosphoswitch in mitophagy and revealed RAB7A as a regulator of membrane contact sites, controlling mitochondria-lysosome tethering and mitochondrial fission.\",\n      \"evidence\": \"Phosphoproteomics and in vitro TBK1 kinase assay with S72E/S72A mutants and mitophagy/ATG9A readouts; multi-modal imaging of mitochondria-lysosome contacts with TBC1D15/FIS1 manipulation\",\n      \"pmids\": [\"30627666\", \"29364868\", \"29907658\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Which GEF acts on phospho-Rab7 at damaged mitochondria not fully defined at this stage\", \"How contact-site Rab7 is spatially distinguished from degradative Rab7 unclear\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Dissected phosphoinositide-driven Rab7 cycling on/off membranes and showed the Ser72 phosphoswitch also governs innate immune (STING) and ciliary outcomes, broadening its regulatory reach.\",\n      \"evidence\": \"Acute PI4P-to-PI(4,5)P2 conversion and PI4K2A KO with live Rab7/PLEKHM1 imaging; PIPKIγi5 co-IP and KD; phosphomimetic Rab7 effects on STING/IRF3 targets; siRNA effects on ciliogenesis and ectocytosis\",\n      \"pmids\": [\"31368593\", \"31908013\", \"31662325\", \"31619485\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How distinct phosphoinositides are coordinated across endosome maturation incompletely resolved\", \"Single-lab readouts for STING and cilia roles\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Identified the trimeric Mon1-Ccz1-C18orf8 GEF as the activator licensing Rab7-NPC1-dependent lysosomal cholesterol export, and showed CLN3 organizes Rab7-effector interactions, anchoring Rab7 in lysosomal storage disease biology.\",\n      \"evidence\": \"Genome-wide CRISPR screen, GEF subunit KOs with active-Rab7 rescue, and Rab7-NPC1 co-IP; CLN3-KO and disease-mutant co-IP with retromer/PLEKHM1 trafficking assays\",\n      \"pmids\": [\"33144569\", \"32034082\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry and assembly of the GEF complex on membranes not fully resolved\", \"How CLN3 mechanistically promotes effector binding unclear\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Defined RMC1/C5orf51 as a MON1-CCZ1 component stabilizing GDP-Rab7, solved the structural basis of GTP-dependent PDZD8 tethering, and showed Parkin ubiquitinates and degrades Rab7 and its GEF to limit mitophagy.\",\n      \"evidence\": \"miniTurbo proximity proteomics and co-IP with GDP-locked Rab7 plus C5orf51 KO; crystal structure and ITC of PDZD8-CC:GTP-Rab7; oocyte Rab7Q67L/ML098 rescue with ubiquitin-proteasome analysis\",\n      \"pmids\": [\"34432599\", \"34552186\", \"34229552\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How GEF complex composition is regulated dynamically unresolved\", \"Physiological balance between Parkin activation and degradation of Rab7 unclear\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Resolved the structural and functional logic of the Ser72 phosphoswitch (Rubicon-to-Pacer exchange), added succinylation/ubiquitination as activity-tuning PTMs, linked Rab7 to mTORC1 and ALS/FTD, and showed viral hijacking of Rab7 GAPs to drive hyperactivation.\",\n      \"evidence\": \"Rubicon:Rab7 crystal structure with in vitro TBK1 phosphorylation, Pacer KO and phosphate-binding mutant rescue; SIRT5 desuccinylation (K31) and USP4 deubiquitination assays with in vivo models; lysosomal TBK1-Rab7-mTORC1 axis and TBK1 E696K mutant; SARS-CoV-2 ORF3a-Vps39 sequestration of TBC1D5\",\n      \"pmids\": [\"38728007\", \"38837686\", \"39663592\", \"39103493\", \"38448435\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How multiple PTMs are integrated on the same Rab7 molecule in time unresolved\", \"In vivo relevance of the mTORC1 and STING branches to human disease incompletely established\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved how the many parallel inputs — distinct GEF/GAP modules, phosphoinositide cues, and the Ser72/Tyr183/Lys31/ubiquitin post-translational marks — are spatially and temporally integrated on individual Rab7 pools to select specific effectors and membrane outcomes, and how this integration is corrupted in CMT2B and other diseases.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model coordinating PTMs, GEFs, GAPs, and lipids on a single Rab7 domain\", \"Gain- versus loss-of-function in CMT2B unreconciled across model systems\", \"Effector-selection rules across the many specialized Rab7 functions undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003924\", \"supporting_discovery_ids\": [0, 8, 26, 20]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [4, 9, 22, 17, 25]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005770\", \"supporting_discovery_ids\": [0, 4, 9, 22]},\n      {\"term_id\": \"GO:0005764\", \"supporting_discovery_ids\": [0, 26, 33, 28]},\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [36, 28]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [26, 28]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [4, 27]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [0, 25, 32]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [27, 39, 28, 29]},\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [6, 7, 46, 47]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [33, 42, 48]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [8, 41, 44]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"RILP\", \"PLEKHM1\", \"WDR91\", \"TBC1D5\", \"TBC1D15\", \"NPC1\", \"PDZD8\", \"Rubicon\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}