{"gene":"VPS35","run_date":"2026-06-11T09:02:06","timeline":{"discoveries":[{"year":1992,"finding":"Vps35p is a peripheral membrane protein (~80% associates with a membranous particulate fraction) required for vacuolar protein sorting; vps35 null mutants quantitatively missort and secrete carboxypeptidase Y (CPY) but retain most PrA, PrB, and ALP, indicating alternative sorting pathways exist for different vacuolar hydrolases.","method":"Gene disruption (null allele), subcellular fractionation, vacuolar protein sorting assay in S. cerevisiae","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct genetic disruption with biochemical fractionation and cargo-sorting assays; foundational study replicated by subsequent work","pmids":["1498362"],"is_preprint":false},{"year":1997,"finding":"Vps35p, together with Vps29p and Vps30p, is required for retrieval of the vacuolar sorting receptor Vps10p from the prevacuolar endosome back to the Golgi; loss of VPS35 shifts Vps10p from the Golgi to the vacuolar membrane via a Pep12p-dependent (pre-vacuolar endosomal t-SNARE) but Sec1p-independent route; Vps35p co-fractionates with Vps10p even in vps29 mutants, suggesting direct interaction.","method":"Temperature-conditional VPS35 allele, subcellular fractionation, epistasis analysis with pep12 and sec1 mutants, co-fractionation in S. cerevisiae","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — temperature-conditional allele with biochemical fractionation, epistasis, and co-fractionation; multiple orthogonal methods in a rigorous study","pmids":["9105038"],"is_preprint":false},{"year":2006,"finding":"Crystal structure of human Vps26A (2.1-Å resolution) reveals an arrestin-fold with two curved β-sandwich domains; the Vps35-binding site maps to a mobile loop (residues 235–246) near the tip of the C-terminal domain; hydrophobic residues and a glycine in this loop are required for Vps26 integration into the retromer complex and endosomal localization, and for yeast Vps26 function in CPY sorting.","method":"X-ray crystallography, mutagenesis, endosomal localization assay, yeast CPY sorting complementation","journal":"Nature structural & molecular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — atomic-resolution crystal structure combined with mutagenesis and functional complementation in a single study","pmids":["16732284"],"is_preprint":false},{"year":2007,"finding":"VPS35 interacts (indirectly) with the LRP6 intracellular domain; an N-terminal deletion mutant of VPS35 reduces canonical Wnt signaling in HEK-293 cells expressing Wnt-1, placing retromer-mediated endosomal trafficking upstream of Wnt signal transduction.","method":"GST fusion protein pulldown, luciferase Tcf reporter assay in HEK-293 cells","journal":"Neurobiology of disease","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single pulldown for interaction, single reporter assay for function; single lab, no replication","pmids":["17239604"],"is_preprint":false},{"year":2007,"finding":"A conserved PRLYL motif in the N-terminal domain of Vps35 is critical for retromer subcomplex assembly; mutation of the corresponding R107W in human VPS35 displaces the protein to the cytosol, prevents co-precipitation with Vps26, and abrogates dominant-negative trafficking in yeast; in pancreatic β-cells the R107W mutant shifts from peripheral endosomes to a juxtanuclear compartment, altering mannose phosphate receptor and insulin distribution.","method":"Yeast dominant-negative assay, co-immunoprecipitation, subcellular fractionation, immunofluorescence in pancreatic β-cells","journal":"Traffic (Copenhagen, Denmark)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mutagenesis combined with co-IP, fractionation, and localization across two cell systems; single lab","pmids":["17916227"],"is_preprint":false},{"year":2007,"finding":"Drosophila Vps35 loss inhibits scavenger receptor ligand endocytosis, mislocalizes endocytic proteins and receptors, leads to overproliferation of blood cells (tumor suppressor function), causes upregulation of TGFβ/BMP signaling at the neuromuscular junction, and negatively regulates actin polymerization; genetic interactions indicate actin dysregulation underlies some endocytic and signaling defects.","method":"RNAi knockdown in Drosophila S2 cells and larvae, endocytosis assay, immunofluorescence, genetic interaction analysis","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal assays (endocytosis, signaling, genetic interactions) in a single study; Drosophila ortholog","pmids":["18057029"],"is_preprint":false},{"year":2010,"finding":"Retromer component Vps35, together with Vps26, is found in complex with the mitochondrial SUMO E3 ligase MAPL; Vps35 is recruited to mitochondria-derived vesicles (MDVs); silencing Vps35 or Vps26A significantly reduces delivery of MAPL from mitochondria to peroxisomes, defining a retromer-dependent mitochondria-to-peroxisome trafficking route.","method":"Unbiased co-immunoprecipitation screen, confocal imaging, siRNA knockdown, MAPL delivery assay","journal":"Current biology : CB","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP plus functional knockdown with delivery assay; single lab, two orthogonal methods","pmids":["20619655"],"is_preprint":false},{"year":2010,"finding":"The Vps26b-Vps29-Vps35 retromer sub-complex mediates transport of sortilin from endosomes to the trans-Golgi network; Vps26b-deficient mice lack this specific complex (while the Vps26a-Vps29-Vps35 complex persists) and show ~20% increased sortilin levels, with normal SorLA.","method":"Vps26b knockout mice, co-immunoprecipitation, Western blot quantification of sortilin/SorLA","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic knockout combined with biochemical assessment of cargo levels; single lab","pmids":["21040701"],"is_preprint":false},{"year":2011,"finding":"VPS35 interacts with BACE1 (β-secretase) and promotes its endosome-to-Golgi retrieval; loss of VPS35 function in the mouse hippocampus increased BACE1 activity, enriched BACE1 in endosomes (rather than trans-Golgi), elevated Aβ levels, and accelerated Alzheimer's disease-like phenotypes in Tg2576 mice.","method":"Co-immunoprecipitation, immunofluorescence, Vps35 hemizygous deletion in Tg2576 mice, BACE1 activity assay, Aβ ELISA","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP plus genetic mouse model with cargo localization and enzymatic activity assays; multiple orthogonal methods replicated across in vitro and in vivo","pmids":["22105352"],"is_preprint":false},{"year":2012,"finding":"The WASH complex is recruited to endosomes via interaction of its FAM21 subunit's long unstructured tail with VPS35; this interaction is necessary and sufficient to target the WASH complex to endosomes; overexpression of the FAM21 tail increases cytoplasmic WASH complex and causes cell-spreading defects, implicating WASH-retromer in mobilizing membrane into the endosome-to-cell-surface pathway.","method":"Co-immunoprecipitation, endosomal localization assays, FAM21-tail overexpression cell-spreading assay","journal":"The Biochemical journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus localization and functional overexpression assays; single lab with two orthogonal methods","pmids":["22070227"],"is_preprint":false},{"year":2012,"finding":"VPS35 is required for retrograde trafficking of BACE1 in developing hippocampal neurons; Vps35 depletion impairs apical dendritic growth, reduces dendritic spines, and causes swollen commissural axons; suppression of BACE1 expression partially rescues both dendritic and axonal deficits, identifying BACE1 as a critical VPS35 cargo in vivo.","method":"In utero electroporation of microRNA against Vps35, immunofluorescence, dendritic/axonal morphometry, BACE1 rescue experiment in neonatal mice","journal":"Biology open","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo loss-of-function with morphometric and rescue analysis; single lab, multiple readouts","pmids":["23259059"],"is_preprint":false},{"year":2013,"finding":"VPS35 regulates RANK trafficking; VPS35 loss alters RANKL-induced RANK distribution, enhances RANKL sensitivity, sustains RANKL signaling, and increases hyperresorptive osteoclast formation; hemizygous Vps35 deletion in mice causes hyperresorptive osteoclastogenesis, decreased bone formation, and osteoporotic deficits.","method":"VPS35 loss-of-function in osteoclast cultures and Vps35+/− mice, RANK distribution by immunofluorescence, RANKL signaling assays, micro-CT bone analysis","journal":"The Journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic mouse model combined with cellular signaling assays; single lab, multiple orthogonal readouts","pmids":["23509071"],"is_preprint":false},{"year":2013,"finding":"The PD-linked VPS35 D620N mutant is correctly folded and retains binding to Vps29 and Vps26A with wild-type affinity, but its expression redistributes retromer-positive endosomes to a perinuclear localization (enlarged endosomes), disrupts trafficking of cathepsin D (a CI-M6PR ligand responsible for α-synuclein degradation), while still interacting with CI-M6PR cargo.","method":"Protein folding analysis, co-immunoprecipitation, immunofluorescence subcellular localization, cathepsin D trafficking assay in cell lines and patient fibroblasts","journal":"Traffic (Copenhagen, Denmark)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple biochemical and cell-biology assays in both model lines and patient-derived cells; single lab","pmids":["24152121"],"is_preprint":false},{"year":2014,"finding":"VPS35 D620N mutation perturbs endosome-to-TGN transport but not endosome-to-plasma membrane recycling; SILAC-based interactome comparison reveals the primary defect is a 2.2-fold decrease in affinity for FAM21 (WASH complex component), measured by isothermal calorimetry; confirmed in patient fibroblasts.","method":"SILAC-based quantitative proteomics (interactome), isothermal calorimetry, retrograde transport assay, patient fibroblast analysis","journal":"Current biology : CB","confidence":"High","confidence_rationale":"Tier 1 / Strong — quantitative biophysical affinity measurement (ITC) combined with SILAC proteomics and patient-cell validation; multiple orthogonal methods in one study","pmids":["24980502"],"is_preprint":false},{"year":2014,"finding":"VPS35 D620N mutant associates poorly with the WASH complex and impairs WASH recruitment to endosomes; autophagy is impaired in cells expressing PD-mutant VPS35 or lacking WASH; the autophagy defect is partly explained by abnormal trafficking of the autophagy protein ATG9A.","method":"Co-immunoprecipitation, endosomal localization of WASH, autophagy flux assays, ATG9A trafficking assay","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, localization, and functional autophagy/trafficking assays; replicated across multiple cell models","pmids":["24819384"],"is_preprint":false},{"year":2014,"finding":"Retromer depletion (VPS35 knockdown) increases lysosomal turnover of the mannose 6-phosphate receptor, impairs maturation of cathepsin D, and leads to accumulation of α-synuclein in lysosomes; in Drosophila, VPS35 knockdown increases detergent-insoluble α-synuclein and exacerbates locomotor impairment and neurodegeneration in α-synuclein-expressing flies.","method":"siRNA knockdown, cathepsin D maturation assay, α-synuclein solubility assay, Drosophila locomotor and eye phenotype analysis","journal":"Neurobiology of disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — biochemical maturation assays combined with in vivo Drosophila genetics; single lab","pmids":["25107340"],"is_preprint":false},{"year":2014,"finding":"Rab7 recruits retromer to late endosomes via direct interactions with N-terminal conserved regions in Vps35; association of Vps26 with Vps35 allosterically increases affinity between the Vps sub-complex and activated Rab7; a mutation disrupting the Vps35–Vps26 interaction perturbs Rab7-mediated retromer recruitment to endosomes in HeLa cells.","method":"FRET assay in HeLa cells, biophysical binding measurements, mutagenesis","journal":"Traffic (Copenhagen, Denmark)","confidence":"Medium","confidence_rationale":"Tier 1-2 / Moderate — FRET-based in vivo interaction measurement plus biophysical binding assays and mutagenesis; single lab","pmids":["25367362"],"is_preprint":false},{"year":2014,"finding":"VPS35 localizes to dendritic spines and is involved in trafficking of AMPA-type glutamate receptor subunits (GluA1/GluA2); VPS35 D620N acts as a loss-of-function mutation with respect to synaptic transmission and AMPAR recycling in mouse cortical neurons and iPSC-derived dopamine neurons from D620N carriers, altering excitatory synaptic transmission and AMPAR surface expression.","method":"Immunofluorescence localization, electrophysiology (mEPSC recording), AMPAR surface expression assay, iPSC-derived neuron model","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — electrophysiology combined with surface expression assays in mouse neurons and patient-derived iPSC neurons; single lab","pmids":["25416282"],"is_preprint":false},{"year":2014,"finding":"Genetic interaction between VPS35 and EIF4G1 in yeast and worm models: EIF4G1 upregulation causes protein misfolding defects rescued by sortilin expression downstream of VPS35, placing sortilins in a VPS35-dependent pathway; interactions extend to α-synuclein pathobiology.","method":"Yeast genetic modifier screen, epistasis analysis, C. elegans and transgenic mouse models","journal":"Neuron","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis across multiple model organisms; single lab","pmids":["25533483"],"is_preprint":false},{"year":2015,"finding":"VPS35 deficiency or D620N mutation in dopamine neurons impairs endosome-to-Golgi retrieval of Lamp2a (CMA receptor), accelerating Lamp2a degradation; this reduces chaperone-mediated autophagy and leads to α-synuclein accumulation; re-expression of Lamp2a in VPS35-deficient neurons reduces α-synuclein, establishing a VPS35–Lamp2a–α-synuclein pathway.","method":"Conditional Vps35 knockout in DA neurons, endosome-to-Golgi trafficking assay for Lamp2a, immunofluorescence, CMA assay, α-synuclein quantification, Lamp2a rescue experiment","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic knockout combined with trafficking assays, biochemical quantification, and rescue experiment; multiple orthogonal methods","pmids":["26203154"],"is_preprint":false},{"year":2015,"finding":"VPS35 deficiency or D620N mutation increases mitochondrial E3 ubiquitin ligase MUL1, leading to ubiquitin-mediated degradation of mitofusin 2 (MFN2), mitochondrial fragmentation, and DA neuron loss; suppression of MUL1 rescues MFN2 levels and DA neuron loss but not α-synuclein accumulation.","method":"Conditional Vps35 KO in DA neurons, MUL1/MFN2 Western blot, MUL1 siRNA rescue, immunofluorescence of mitochondrial morphology","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic knockout with molecular pathway dissection (MUL1→MFN2), rescue experiment, and multiple readouts; single lab with rigorous controls","pmids":["26321632"],"is_preprint":false},{"year":2015,"finding":"PD-associated VPS35 mutants (D620N) cause mitochondrial fragmentation and cell death through increased interaction with dynamin-like protein 1 (DLP1/Drp1), enhancing turnover of mitochondrial DLP1 complexes via MDV-dependent trafficking to lysosomes; oxidative stress increases VPS35–DLP1 interaction; inhibition of mitochondrial fission prevents VPS35 mutant-induced mitochondrial deficits; VPS35–DLP1 interaction is increased in brains of sporadic PD cases.","method":"Co-immunoprecipitation, mitochondrial morphology analysis, cell death assay, DLP1 complex turnover assay, fission inhibitor rescue, brain tissue Co-IP from sporadic PD cases","journal":"Nature medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, functional rescue with fission inhibitor, multiple cell models (neurons in vitro/in vivo, patient fibroblasts, human brain tissue); replicated across systems","pmids":["26618722"],"is_preprint":false},{"year":2015,"finding":"VPS35 deficiency impairs dendritic spine maturation and decreases glutamatergic transmission; VPS35 interacts with AMPA receptor subunits GluA1 and GluA2; GluA1 and GluA2 are significantly reduced in synaptosomal and PSD fractions from VPS35-deficient brain; GluA2 overexpression (but not GluA1) partially restores spine maturation in VPS35-deficient neurons.","method":"Co-immunoprecipitation, synaptosomal fractionation, surface AMPAR quantification, dendritic spine analysis, rescue overexpression","journal":"Molecular brain","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP combined with biochemical fractionation, spine morphometry, and rescue experiment; single lab","pmids":["26521016"],"is_preprint":false},{"year":2015,"finding":"VPS29 and VPS35 form a biologically stable sub-complex in vivo; deficiency of VPS35 or VPS29 causes degradation of the other retromer subunits, whereas VPS26 deficiency does not affect VPS29 and VPS35 levels; VPS26–VPS35 sub-complex is more susceptible to ubiquitin-proteasome degradation than VPS29–VPS35.","method":"siRNA knockdown of individual subunits, Western blot, in vitro sub-complex formation assay, proteasome inhibitor treatment","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal knockdown with biochemical stability assays and in vitro reconstitution; single lab","pmids":["25937119"],"is_preprint":false},{"year":2016,"finding":"VPS35 binds farnesylated (but not palmitoylated or GTP-loaded) N-Ras in the cytosol as part of a high-molecular-weight complex; VPS35 silencing increases N-Ras association with cytoplasmic vesicles, diminishes GTP loading of Ras, and inhibits MAPK signaling and growth of N-Ras-dependent melanoma cells.","method":"Affinity purification and mass spectrometry, co-immunoprecipitation, N-Ras GTP-loading assay, MAPK signaling assay, cell growth assay with VPS35 siRNA","journal":"The Journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — MS-identified interaction confirmed by Co-IP with farnesyl-dependence test and functional downstream assays; single lab","pmids":["27502489"],"is_preprint":false},{"year":2016,"finding":"Vps35 regulates recycling of Trem2 from endosomes to the plasma membrane in microglia; Trem2 is internalized via clathrin-dependent endocytosis and recycled through Vps35 (not Rab11); Vps35 knockdown causes Trem2 accumulation in lysosomes without degradation and leads to excessive LPS-induced iNOS/IL-6 pro-inflammatory responses; AD-associated R47H Trem2 mutant fails to interact with Vps35 and is unstable.","method":"Co-immunoprecipitation, siRNA knockdown, immunofluorescence, clathrin inhibition assay, inflammatory cytokine measurement, Trem2 overexpression rescue","journal":"Traffic (Copenhagen, Denmark)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus functional knockdown with cargo localization and inflammatory readouts; single lab","pmids":["27717139"],"is_preprint":false},{"year":2016,"finding":"VPS35 interacts with dopamine receptor D1 (DRD1) and promotes its recycling to the cell surface after endocytosis; VPS35 overexpression/knockdown increases/decreases DRD1 surface levels and downstream CREB/ERK phosphorylation; the D620N mutant retains DRD1 binding but fails to promote DRD1 recycling or rescue CREB/ERK signaling.","method":"Co-immunoprecipitation, surface receptor recycling assay, CREB/ERK phosphorylation Western blot, VPS35 overexpression and siRNA knockdown","journal":"Neurobiology of aging","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP combined with recycling and signaling assays; single lab, multiple orthogonal methods","pmids":["27460146"],"is_preprint":false},{"year":2016,"finding":"Parkinson's disease-associated Vps35 R524W variant (but not P316S) is a loss-of-function mutation: it shows reduced association with the retromer regulatory network and dysregulated endosomal receptor sorting; R524W expression causes intracellular α-synuclein-positive aggregate accumulation; R55 small molecule partially rescues R524W endosomal association.","method":"Co-immunoprecipitation, endosomal localization assay, α-synuclein immunofluorescence, pharmacological rescue with R55","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with functional cargo-sorting and localization assays; single lab","pmids":["27385586"],"is_preprint":false},{"year":2017,"finding":"A conserved FLV motif in the C-terminus of DLP1 mediates interaction with VPS35; a decoy peptide based on this motif blocks VPS35–DLP1 interaction, inhibits recycling of mitochondrial DLP1 complexes, and rescues D620N-induced mitochondrial fragmentation and respiratory deficits in both M17 cells and patient fibroblasts.","method":"Mutagenesis of FLV motif, Co-IP, decoy peptide treatment, mitochondrial morphology and respiration assays in cell lines and patient fibroblasts","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 1 / Moderate — motif mutagenesis identifying specific interaction site combined with peptide inhibitor rescue in patient-derived cells; mechanistic and translational validation","pmids":["28040727"],"is_preprint":false},{"year":2017,"finding":"Drosophila Vps35 loss affects synaptic vesicle recycling and dopaminergic synaptic release; dLRRK together with Rab5 and Rab11 participates in the same synaptic vesicle recycling pathway; manipulation of dLRRK/Rab5/Rab11 activity improves vps35 synaptic phenotypes, placing VPS35 and LRRK2 in a common endosomal synaptic vesicle recycling pathway.","method":"Drosophila genetics, synaptic vesicle recycling assay, dopamine release measurement, genetic interaction analysis","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis with functional synaptic assays in Drosophila; single lab","pmids":["28482024"],"is_preprint":false},{"year":2017,"finding":"VPS35 promotes lysosomal clearance of the parkin substrate AIMP2; VPS35 co-immunoprecipitates with AIMP2 and Lamp2a; D620N mutation disrupts VPS35–AIMP2 and VPS35–Lamp2a interactions; VPS35 overexpression prevents AIMP2-induced PARP1-dependent cell death; VPS35 knockdown causes AIMP2-dependent PARP1 activation and cell death.","method":"Co-immunoprecipitation, siRNA knockdown, VPS35 overexpression, PARP1 activation and cell death assays","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with functional knockdown/overexpression and cell death assays; single lab","pmids":["28383562"],"is_preprint":false},{"year":2017,"finding":"VPS35 D620N mutation causes defects in complex I (and II) enzymatic activity and mitochondrial respiratory chain assembly (assembled complexes and supercomplexes reduced) in patient fibroblasts; these deficits are rescued by inhibition of mitochondrial fission, linking excessive fission downstream of D620N to bioenergetic impairment.","method":"Complex I/II enzymatic activity assay, Blue Native PAGE for assembled complexes, Seahorse respirometry, fission inhibitor rescue in patient fibroblasts","journal":"Biochimica et biophysica acta. Molecular basis of disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple biochemical assays in patient-derived cells with mechanistic rescue; single lab","pmids":["28765075"],"is_preprint":false},{"year":2018,"finding":"VPS35 D620N knock-in mutation strikingly elevates LRRK2-mediated phosphorylation of Rab8A, Rab10, and Rab12 in mouse embryonic fibroblasts and in vivo mouse tissues; LRRK2-mediated Rab10 phosphorylation is increased in neutrophils and monocytes from D620N PD patients versus controls; VPS35 knockout/knockdown suppresses LRRK2-mediated Rab phosphorylation in wild-type, LRRK2[R1441C], and VPS35[D620N] cells, indicating VPS35 controls LRRK2 kinase activity.","method":"Knock-in mouse model, phospho-Rab ELISA and Western blot, patient-derived neutrophil/monocyte analysis, VPS35 siRNA/knockout in multiple cell lines","journal":"The Biochemical journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — knock-in animal model combined with patient-derived cell analysis and genetic knockdown across multiple cell lines; replicated across cell types and tissues","pmids":["29743203"],"is_preprint":false},{"year":2018,"finding":"Parkin directly ubiquitinates VPS35 via attachment of an atypical poly-ubiquitin chain to three C-terminal lysine residues; familial parkin mutations impair VPS35 ubiquitination; ubiquitination does not promote proteasomal degradation of VPS35; parkin knockdown in cortical neurons selectively disrupts vesicular sorting of ATG9A (a WASH-dependent retromer cargo); WASH complex components are markedly decreased in brains of parkin knockout mice.","method":"Co-immunoprecipitation, ubiquitination assay, mass spectrometry identification of ubiquitinated lysines, parkin KO mouse brain analysis, ATG9A trafficking assay","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro ubiquitination assay with MS-level site identification, genetic KO model, and functional cargo-sorting assay; multiple orthogonal methods","pmids":["29893854"],"is_preprint":false},{"year":2018,"finding":"VPS35 dysfunction (D620N or siRNA knockdown) impairs retromer-mediated DMT1 (divalent metal transporter 1) trafficking to the trans-Golgi network, redirecting DMT1 to lysosomes and shifting intracellular iron distribution from Golgi-dominant to lysosome-enriched; treatment with retromer stabilizer R55 restores Golgi-dominant iron distribution.","method":"Fluorescent probe (Gol-SiRhoNox) for Golgi-specific Fe(II) detection combined with LysoRhoNox for lysosomal Fe(II), synchronous imaging, VPS35 dysfunction induction, R55 pharmacological rescue","journal":"Chemical science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — novel orthogonal fluorescent probes for subcellular iron imaging with functional perturbation and pharmacological rescue; single lab","pmids":["30809369"],"is_preprint":false},{"year":2018,"finding":"Loss of iPLA2-VIA (Drosophila PLA2G6 homolog) impairs retromer function by reducing interaction with Vps35 and Vps26, leading to progressive ceramide elevation and neurodegeneration; similar defects are observed upon loss of vps26 or vps35, or overexpression of α-synuclein.","method":"Co-immunoprecipitation, genetic epistasis in Drosophila, lipidomic analysis, ceramide-reducing drug rescue","journal":"Cell metabolism","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus genetic epistasis and lipid biochemistry across multiple models; single lab","pmids":["29909971"],"is_preprint":false},{"year":2019,"finding":"VPS35 regulates tau phosphorylation through cathepsin D availability; VPS35 overexpression reduces pathological tau in neuronal cells; VPS35 silencing causes tau accumulation; mechanistically, VPS35 controls the availability of active cathepsin D, which mediates tau degradation; VPS35 knockdown in a tauopathy mouse model exacerbates tau accumulation and motor/learning impairments.","method":"VPS35 overexpression/siRNA in neuronal cells, cathepsin D activity assay, tau phosphorylation Western blot, tauopathy mouse model with AAV-mediated VPS35 knockdown","journal":"Molecular psychiatry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro and in vivo genetic manipulation with mechanistic cathepsin D assay; single lab","pmids":["31289348"],"is_preprint":false},{"year":2019,"finding":"In Arabidopsis, VPS35 interaction with the RAB7 homolog RABG3f-GTP acts as a checkpoint controlling HOPS complex assembly and fusion of late endosomal compartments with the vacuole; the synthetic molecule Endosidin17 targets VPS35 and prevents this interaction, blocking retromer endosome anchoring.","method":"Multiple target identification techniques, genetic analysis, co-immunoprecipitation, chemical biology with Endosidin17","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Low","confidence_rationale":"Tier 3 / Weak — plant (Arabidopsis) ortholog; while mechanistically informative for RAB7-VPS35 interaction, context is plant vacuolar trafficking rather than mammalian retromer; limited direct relevance to mammalian VPS35 mechanism","pmids":["31570580"],"is_preprint":false},{"year":2020,"finding":"Vps35 deficiency in pyramidal neurons increases sortilin1 (Sort1) in lysosomes and causes lysosomal dysfunction; suppression of Sort1 diminishes Vps35-KO-induced dendritic defects; lysosomal Sort1 expression recapitulates Vps35-KO phenotypes, identifying Sort1 as a key cargo whose missorting to lysosomes mediates neurodegenerative pathology.","method":"Conditional Vps35 KO, Sort1 immunofluorescence in lysosomes, Sort1 siRNA rescue, Sort1 overexpression phenocopy, lysosomal function assay","journal":"Cell death and differentiation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO with cargo localization, siRNA rescue, and overexpression phenocopy; single lab","pmids":["31907392"],"is_preprint":false},{"year":2020,"finding":"Vps35 deficiency increases p35 levels and Cdk5/p35 kinase activity by impairing lysosomal degradation of p35; roscovitine (Cdk5 inhibitor) reduces hyperphosphorylated tau induced by Vps35 deficiency; Cdk5/p35 acts as a VPS35 cargo, co-immunoprecipitating with VPS35.","method":"Co-immunoprecipitation, p35/Cdk5 Western blot, roscovitine pharmacological rescue, lysosome marker co-localization, tau phosphorylation assay in retinal ganglion cells","journal":"Investigative ophthalmology & visual science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus pharmacological rescue with multiple biochemical readouts; single lab","pmids":["31995153"],"is_preprint":false},{"year":2020,"finding":"VPS35 D620N mutation in iPSC-derived neurons causes decreased autophagic flux, reduced lysosomal mass, α-synuclein accumulation, mitochondrial dysfunction (reduced membrane potential, impaired respiration, increased ROS), and defective mitophagy.","method":"iPSC reprogramming from D620N patient, dopaminergic neuron differentiation, autophagy flux assay, lysosomal staining, mitochondrial respiration (Seahorse), ROS measurement, mitophagy assay","journal":"Movement disorders","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — patient-derived iPSC model with multiple orthogonal functional assays; single lab","pmids":["33142012"],"is_preprint":false},{"year":2021,"finding":"VPS35 D620N mutant reduces mitochondrial membrane potential at steady state, desensitizes mitochondria to CCCP-induced potential collapse, inhibits PINK1 accumulation at the outer mitochondrial membrane, and consequently impairs Parkin recruitment and PINK1/Parkin-dependent mitophagy initiation.","method":"CRISPR-Cas9 heterozygous D620N knock-in in SH-SY5Y cells, CCCP treatment, mitochondrial membrane potential assay (JC-1), PINK1/Parkin localization by immunofluorescence, mitophagy assessment","journal":"Translational neurodegeneration","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — endogenous knock-in model with functional mitochondrial and mitophagy assays; single lab","pmids":["34127073"],"is_preprint":false},{"year":2021,"finding":"VPS35 D620N knock-in mice at 14 months recapitulate cardinal PD features including progressive motor deficits, DA and metabolite changes in striatum, nigrostriatal neuron degeneration, neuroinflammation, and α-synuclein accumulation; mechanistically, D620N induces mitochondrial fragmentation and dysfunction through enhanced VPS35–DLP1 interaction and increased DLP1 complex turnover in vivo.","method":"VPS35 D620N knock-in mouse model, aging cohort analysis, motor behavior, immunohistochemistry, DA HPLC, mitochondrial morphology, Co-IP for VPS35–DLP1 in aged mice","journal":"Aging cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — knock-in mouse model with comprehensive behavioral, pathological, and mechanistic characterization; replicates and extends in vivo findings from multiple labs","pmids":["33745227"],"is_preprint":false},{"year":2021,"finding":"The Vps35 D620N variant reduces the capacity of retromer to form endosome transport carriers; Vps35 D620N cells show impaired CI-M6PR endosome-to-TGN transport due to reduced binding to the WASH complex and SNX3 (both required for transport carrier formation); endosomes are smaller and rounder with fewer tubular branches.","method":"Vps35 D620N rescue cell model (retromer KO background), CI-M6PR trafficking assay, endosome morphology analysis (electron microscopy/confocal), Co-IP for WASH and SNX3","journal":"Traffic (Copenhagen, Denmark)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — isogenic rescue cell model with trafficking assay, morphological analysis, and protein interaction assays; single lab","pmids":["33347683"],"is_preprint":false},{"year":2022,"finding":"Upon specific mtDNA damage, VPS35 mediates maturation of early endosomes to late autophagy vesicles where mitochondrial nucleoids are degraded; the ATAD3–SAMM50 axis controls nucleoid release from mitochondria, with SAMM50 acting as a gatekeeper for BAK clustering and nucleoid transfer to endosomes; this defines a non-canonical endosomal-mitophagy pathway for selective mtDNA turnover.","method":"Proximity labeling with Twinkle (nucleoid marker), VPS35 knockdown, ATAD3/SAMM50 genetic perturbation, lysosomal inhibition, ATG5 knockout, mtDNA copy number analysis, rapamycin treatment in mouse model","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — proximity labeling combined with genetic perturbations and in vivo mouse model; single lab with multiple orthogonal approaches","pmids":["36344526"],"is_preprint":false},{"year":2023,"finding":"VPS35 D620N mutation alters expression of ~220 lysosomal proteins and drives LRRK2-mediated phosphorylation of Rab proteins at the lysosome, recruiting the phospho-Rab effector RILPL1 to the lysosome where it binds the lysosomal integral membrane protein TMEM55B; D620N reduces RILPL1 levels in a manner reversed by LRRK2 inhibition and proteasome inhibitors; RILPL1 knockout enhances Rab substrate phosphorylation; TMEM55B knockout increases RILPL1 levels.","method":"Quantitative lysosomal proteomics, phospho-Rab Western blot, Co-IP of RILPL1-TMEM55B, mutagenesis of interaction interface, LRRK2 inhibitor treatment, RILPL1/TMEM55B knockout mice","journal":"Science advances","confidence":"High","confidence_rationale":"Tier 1 / Strong — quantitative proteomics combined with mutagenesis, Co-IP, genetic knockouts, and pharmacological rescue across multiple tissues and cell types","pmids":["38091401"],"is_preprint":false},{"year":2023,"finding":"VPS35 selectively binds endocytosed EGFR in early endosomes and recycles it to the cell surface, activating downstream ERK1/2 signaling; VPS35 promotes gastric cancer cell proliferation through EGFR recycling; high VPS35 expression increases sensitivity to EGFR inhibitors in xenograft and organoid models.","method":"Co-immunoprecipitation, biotin surface assay, EGFR recycling assay, ERK1/2 phosphorylation Western blot, patient-derived xenograft and organoid models","journal":"EBioMedicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP combined with surface recycling assay and in vivo models; single lab","pmids":["36738481"],"is_preprint":false},{"year":2023,"finding":"LRRK2 kinase inhibition (MLi-2) normalizes striatal dopamine transporter (DAT) expression and function, and abolishes amphetamine-induced hyperlocomotion in VPS35 D620N knock-in mice, but not in VPS35 haploinsufficient mice; D620N elevates LRRK2-mediated phosphorylation of Rab10, Rab12, and Rab29, while haploinsufficiency reduces Rab12 phosphorylation, demonstrating VPS35 and LRRK2 functionally interact to regulate DAT function and dopamine transmission.","method":"VPS35 D620N knock-in and haploinsufficient mice, LRRK2 kinase inhibitor (MLi-2) treatment, phospho-Rab Western blot, fast-scan cyclic voltammetry, behavioral locomotion assay","journal":"NPJ Parkinson's disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple genetic mouse models with pharmacological intervention and functional dopamine physiology assays; single lab","pmids":["38110354"],"is_preprint":false}],"current_model":"VPS35 is the central cargo-recognition subunit of the retromer complex that retrieves transmembrane cargo proteins (including CI-M6PR, BACE1, Lamp2a, DRD1, EGFR, RANK, Trem2, and sortilin) from endosomes to the trans-Golgi network or plasma membrane by forming a stable trimer with VPS26 (which has an arrestin fold and binds VPS35 via a conserved C-terminal loop) and VPS29, and by recruiting the actin-nucleating WASH complex through a direct VPS35–FAM21 interaction; the pathogenic D620N mutation primarily reduces VPS35 affinity for FAM21, impairing WASH-dependent endosomal tubule formation and cargo sorting, and also hyperactivates LRRK2 kinase (elevating Rab8A/Rab10/Rab12 phosphorylation and triggering a RILPL1–TMEM55B lysosomal assembly), increases VPS35 interaction with the mitochondrial fission GTPase DLP1 to enhance DLP1 complex turnover and mitochondrial fragmentation (via MDV-to-lysosome trafficking), impairs PINK1/Parkin-mediated mitophagy, and disrupts lysosomal degradation of cargoes including Lamp2a (reducing CMA and α-synuclein clearance), ATG9A, and AIMP2; VPS35 is also ubiquitinated on C-terminal lysines by parkin in a non-degradative manner that modulates retromer-dependent sorting, and it mediates a retromer-dependent mitochondria-to-peroxisome trafficking route for the MAPL ligase."},"narrative":{"mechanistic_narrative":"VPS35 is the central cargo-recognition subunit of the retromer complex, an evolutionarily conserved machinery that retrieves transmembrane cargo from endosomes to the trans-Golgi network or plasma membrane [PMID:1498362, PMID:9105038]. It assembles into a stable trimer with VPS29 and VPS26: VPS35 and VPS29 form a biologically stable sub-complex whose subunits stabilize each other, while VPS26 binds VPS35 through a mobile C-terminal loop of its arrestin fold [PMID:16732284, PMID:25937119]. Retromer is recruited to late endosomes by activated Rab7, an interaction allosterically enhanced by VPS26 association with VPS35 [PMID:25367362], and a conserved N-terminal PRLYL/R107 motif is essential for sub-complex assembly [PMID:17916227]. VPS35 drives endosomal tubule and transport-carrier formation by directly binding the FAM21 subunit of the actin-nucleating WASH complex and SNX3 [PMID:22070227, PMID:33347683]. Through this machinery VPS35 sorts a broad cargo repertoire including the CI-M6PR/cathepsin D axis, BACE1, sortilin, Lamp2a, Trem2, DRD1, DMT1, and EGFR, linking retromer to amyloid processing, chaperone-mediated autophagy, microglial inflammation, dopaminergic signaling, iron handling, and receptor-driven proliferation [PMID:21040701, PMID:22105352, PMID:24152121, PMID:26203154, PMID:27717139, PMID:27460146, PMID:30809369, PMID:36738481]. Beyond canonical sorting, VPS35 participates in a retromer-dependent mitochondria-to-peroxisome route delivering the MAPL ligase via mitochondria-derived vesicles [PMID:20619655] and in non-canonical endosomal turnover of damaged mitochondrial nucleoids [PMID:36344526]. The Parkinson's-disease mutation D620N is correctly folded and retains VPS29/VPS26 binding but selectively weakens VPS35 affinity for FAM21, impairing WASH recruitment, endosome-to-TGN transport, and cargo sorting [PMID:24152121, PMID:24980502, PMID:24819384, PMID:33347683]; D620N additionally hyperactivates LRRK2 kinase to elevate Rab8A/Rab10/Rab12 phosphorylation and assemble a RILPL1–TMEM55B lysosomal module [PMID:29743203, PMID:38091401], increases VPS35 interaction with the fission GTPase DLP1 to drive mitochondrial fragmentation and bioenergetic failure [PMID:26618722, PMID:28040727, PMID:28765075, PMID:33745227], and impairs PINK1/Parkin mitophagy [PMID:34127073]. VPS35 is itself ubiquitinated on C-terminal lysines by parkin in a non-degradative manner that supports WASH-dependent sorting of cargoes such as ATG9A [PMID:29893854]. VPS35 mutations cause autosomal-dominant Parkinson's disease, and D620N knock-in mice recapitulate cardinal PD features [PMID:33745227].","teleology":[{"year":1992,"claim":"Established that VPS35 is required for vacuolar protein sorting, defining its foundational role in routing hydrolases to the lysosome/vacuole.","evidence":"Gene disruption with subcellular fractionation and CPY sorting assays in S. cerevisiae","pmids":["1498362"],"confidence":"High","gaps":["Did not identify the molecular partners or cargo-recognition mechanism","Cargo specificity (only CPY missorted) left alternative pathways undefined"]},{"year":1997,"claim":"Defined VPS35 as a receptor-retrieval factor that returns the sorting receptor Vps10p from the endosome to the Golgi, framing retromer as a retrograde recycling machine.","evidence":"Temperature-conditional allele, fractionation, epistasis, and co-fractionation in yeast","pmids":["9105038"],"confidence":"High","gaps":["Direct VPS35–receptor binding inferred from co-fractionation, not demonstrated structurally","Mechanism of subunit assembly not resolved"]},{"year":2006,"claim":"Resolved how VPS26 integrates into retromer, mapping VPS35 binding to an arrestin-fold loop and linking complex assembly to endosomal localization and cargo sorting.","evidence":"X-ray crystallography, mutagenesis, and yeast CPY complementation","pmids":["16732284"],"confidence":"High","gaps":["Structure of full VPS35 and the cargo-binding surface not solved","Did not address mammalian disease cargo"]},{"year":2007,"claim":"Identified the N-terminal PRLYL/R107 motif as critical for retromer sub-complex assembly, showing assembly defects displace VPS35 to the cytosol and disrupt receptor distribution.","evidence":"Yeast dominant-negative assay, co-IP, fractionation, and β-cell immunofluorescence","pmids":["17916227"],"confidence":"Medium","gaps":["Single-lab characterization of the R107W variant","Functional consequence for specific mammalian cargo limited"]},{"year":2010,"claim":"Extended retromer beyond endosome-to-Golgi sorting by showing VPS35/VPS26 mediate a mitochondria-to-peroxisome route for MAPL via mitochondria-derived vesicles.","evidence":"Unbiased Co-IP screen, confocal imaging, siRNA knockdown, and MAPL delivery assay","pmids":["20619655"],"confidence":"Medium","gaps":["Whether VPS35 directly recognizes MAPL cargo not established","Single-lab finding without reciprocal in vivo validation"]},{"year":2011,"claim":"Connected VPS35 to Alzheimer pathology by demonstrating it retrieves BACE1 from endosomes, with loss elevating Aβ in vivo.","evidence":"Reciprocal Co-IP, Vps35 hemizygous Tg2576 mice, BACE1 activity, and Aβ ELISA","pmids":["22105352"],"confidence":"High","gaps":["Direct vs indirect BACE1 binding not fully resolved","Did not address PD-mutant effect on this cargo"]},{"year":2012,"claim":"Identified the direct VPS35–FAM21 interaction as the mechanism recruiting the WASH actin machinery to endosomes, coupling retromer to actin-dependent carrier formation.","evidence":"Co-IP, endosomal localization, and FAM21-tail overexpression cell-spreading assay","pmids":["22070227"],"confidence":"Medium","gaps":["Binding interface on VPS35 not mapped at residue level here","Did not test disease mutations"]},{"year":2013,"claim":"Showed the PD-linked D620N mutant is folded and retains VPS29/VPS26 binding yet redistributes endosomes and disrupts cathepsin D trafficking, reframing D620N as a sorting defect rather than a folding defect.","evidence":"Folding analysis, Co-IP, localization, and cathepsin D trafficking in cells and patient fibroblasts","pmids":["24152121"],"confidence":"Medium","gaps":["The specific interaction lost was not yet identified","Mechanism linking cathepsin D defect to α-synuclein not directly shown"]},{"year":2014,"claim":"Pinpointed the primary D620N defect as a ~2-fold reduced FAM21 affinity that selectively impairs endosome-to-TGN transport and WASH-dependent autophagy/ATG9A trafficking.","evidence":"SILAC interactome and ITC affinity measurement plus autophagy/ATG9A and WASH localization assays in patient fibroblasts","pmids":["24980502","24819384"],"confidence":"High","gaps":["Did not explain mitochondrial or LRRK2 phenotypes of D620N","Quantitative link from reduced FAM21 affinity to neurodegeneration unresolved"]},{"year":2014,"claim":"Established the membrane-recruitment logic of retromer by showing Rab7 binds VPS35 N-terminal regions and VPS26 allosterically boosts this affinity.","evidence":"FRET in HeLa cells, biophysical binding assays, and mutagenesis","pmids":["25367362"],"confidence":"Medium","gaps":["Structural basis of the Rab7–VPS35 interface not resolved","Single-lab measurement"]},{"year":2015,"claim":"Linked VPS35 cargo sorting directly to α-synuclein clearance by showing it retrieves the CMA receptor Lamp2a, with rescue restoring α-synuclein degradation.","evidence":"Conditional Vps35 KO in DA neurons, Lamp2a trafficking and CMA assays, and Lamp2a rescue","pmids":["26203154"],"confidence":"High","gaps":["Whether VPS35 binds Lamp2a directly not established","Relative contribution of CMA vs other clearance routes unquantified"]},{"year":2015,"claim":"Defined mitochondrial pathways downstream of VPS35 dysfunction: enhanced DLP1 interaction driving fission and MUL1-mediated MFN2 degradation causing DA neuron loss.","evidence":"Co-IP, fission-inhibitor rescue, MUL1 siRNA rescue, and brain tissue analysis from PD cases","pmids":["26618722","26321632"],"confidence":"High","gaps":["How a retromer cargo-sorting protein engages mitochondrial fission machinery mechanistically unclear","MUL1 and DLP1 axes not fully reconciled"]},{"year":2015,"claim":"Implicated VPS35 in synaptic function via trafficking of AMPA receptor subunits, with D620N behaving as loss-of-function for synaptic transmission.","evidence":"Co-IP, electrophysiology, surface AMPAR assays in mouse and D620N iPSC neurons, and rescue overexpression","pmids":["25416282","26521016"],"confidence":"Medium","gaps":["Direct vs adaptor-mediated AMPAR binding not resolved","Single-lab synaptic measurements"]},{"year":2016,"claim":"Broadened the cargo repertoire to Trem2 and DRD1 recycling, connecting VPS35 to microglial inflammation and dopaminergic signaling, with D620N selectively failing recycling.","evidence":"Co-IP, recycling assays, inflammatory cytokine and CREB/ERK readouts with knockdown/overexpression","pmids":["27717139","27460146"],"confidence":"Medium","gaps":["Direct cargo-binding interfaces not mapped","Single-lab studies for each cargo"]},{"year":2017,"claim":"Mapped the DLP1–VPS35 interaction to a conserved DLP1 FLV motif and demonstrated decoy-peptide rescue of D620N mitochondrial defects, providing mechanistic and translational validation.","evidence":"Motif mutagenesis, Co-IP, decoy peptide, and respiration assays in cells and patient fibroblasts","pmids":["28040727"],"confidence":"High","gaps":["Why D620N increases this interaction at the structural level unexplained","In vivo efficacy of peptide not tested here"]},{"year":2018,"claim":"Revealed that VPS35 controls LRRK2 kinase activity, with D620N strikingly elevating LRRK2-mediated Rab8A/Rab10/Rab12 phosphorylation in vivo and in patient cells.","evidence":"D620N knock-in mice, phospho-Rab assays, patient neutrophils/monocytes, and VPS35 knockdown across cell lines","pmids":["29743203"],"confidence":"High","gaps":["Molecular mechanism by which VPS35 regulates LRRK2 not defined","Link between Rab hyperphosphorylation and cargo sorting unresolved"]},{"year":2018,"claim":"Showed parkin directly ubiquitinates VPS35 on C-terminal lysines in a non-degradative manner required for WASH-dependent ATG9A sorting, integrating two PD genes.","evidence":"Ubiquitination assay, MS site identification, parkin KO mouse brain, and ATG9A trafficking","pmids":["29893854"],"confidence":"High","gaps":["How atypical ubiquitin chains alter retromer function mechanistically unclear","Functional consequence beyond ATG9A not surveyed"]},{"year":2020,"claim":"Demonstrated that missorting of specific cargoes (sortilin1, Cdk5/p35) to lysosomes upon VPS35 loss drives neurodegenerative phenotypes, with cargo suppression rescuing defects.","evidence":"Conditional Vps35 KO, cargo lysosomal localization, siRNA rescue/phenocopy, and Cdk5 inhibitor rescue","pmids":["31907392","31995153"],"confidence":"Medium","gaps":["Direct cargo-binding for each not established","Single-lab models"]},{"year":2021,"claim":"Connected D620N to impaired PINK1/Parkin mitophagy by showing it inhibits PINK1 stabilization and Parkin recruitment, and reproduced cardinal PD pathology in aged knock-in mice.","evidence":"CRISPR D620N knock-in cells with mitophagy assays and aged D620N knock-in mouse phenotyping with DLP1 Co-IP","pmids":["34127073","33745227"],"confidence":"High","gaps":["Causal ordering of fission, bioenergetic and mitophagy defects unresolved","Mechanism by which D620N blocks PINK1 accumulation unclear"]},{"year":2023,"claim":"Resolved the lysosomal arm of D620N signaling, showing LRRK2-driven phospho-Rabs recruit RILPL1 to TMEM55B at the lysosome and reshape the lysosomal proteome.","evidence":"Quantitative lysosomal proteomics, Co-IP, interface mutagenesis, LRRK2 inhibition, and RILPL1/TMEM55B knockout mice","pmids":["38091401"],"confidence":"High","gaps":["Physiological consequence of the RILPL1–TMEM55B module for neurodegeneration unclear","Connection to retromer cargo sorting not directly drawn"]},{"year":2023,"claim":"Demonstrated in vivo that LRRK2 kinase inhibition normalizes dopamine transporter function specifically in D620N (not haploinsufficient) mice, establishing a functional VPS35–LRRK2 axis governing dopamine transmission.","evidence":"D620N and haploinsufficient mice, MLi-2 treatment, phospho-Rab blots, voltammetry, and behavior","pmids":["38110354"],"confidence":"Medium","gaps":["Whether DAT is a direct retromer cargo not shown","Distinct phenotypes of gain-of-function D620N vs haploinsufficiency mechanistically separate"]},{"year":null,"claim":"How a single D620N substitution simultaneously weakens FAM21 binding, hyperactivates LRRK2 kinase, and rewires mitochondrial fission remains mechanistically unresolved at the structural level.","evidence":"","pmids":[],"confidence":"High","gaps":["No structure explaining D620N gain-of-function toward LRRK2 and DLP1","The molecular link between cytosolic retromer sorting and mitochondrial/lysosomal phenotypes is not unified","Direct cargo-binding surfaces on VPS35 for most named cargoes remain unmapped"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[1,9,43]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[2,23]},{"term_id":"GO:0038024","term_label":"cargo receptor activity","supporting_discovery_ids":[1,8,26]}],"localization":[{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[9,16,43,46]},{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[1,8,34]},{"term_id":"GO:0005764","term_label":"lysosome","supporting_discovery_ids":[25,38,45]},{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[6,21,44]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[0,4,24]}],"pathway":[{"term_id":"R-HSA-9609507","term_label":"Protein localization","supporting_discovery_ids":[0,1,8,19]},{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[6,9,43,46]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[14,33,40,44]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[21,32,42,45]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[26,46,47]}],"complexes":["retromer (VPS35–VPS29–VPS26)","WASH complex (via FAM21)"],"partners":["VPS29","VPS26","FAM21","VPS10/SORTILIN","DLP1","BACE1","RAB7","SNX3"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q96QK1","full_name":"Vacuolar protein sorting-associated protein 35","aliases":["Maternal-embryonic 3","Vesicle protein sorting 35"],"length_aa":796,"mass_kda":91.7,"function":"Acts as a component of the retromer cargo-selective complex (CSC). The CSC is believed to be the core functional component of retromer or respective retromer complex variants acting to prevent missorting of selected transmembrane cargo proteins into the lysosomal degradation pathway. The recruitment of the CSC to the endosomal membrane involves RAB7A and SNX3. The CSC seems to associate with the cytoplasmic domain of cargo proteins predominantly via VPS35; however, these interactions seem to be of low affinity and retromer SNX proteins may also contribute to cargo selectivity thus questioning the classical function of the CSC. The SNX-BAR retromer mediates retrograde transport of cargo proteins from endosomes to the trans-Golgi network (TGN) and is involved in endosome-to-plasma membrane transport for cargo protein recycling. The SNX3-retromer mediates the retrograde endosome-to-TGN transport of WLS distinct from the SNX-BAR retromer pathway (PubMed:30213940). The SNX27-retromer is believed to be involved in endosome-to-plasma membrane trafficking and recycling of a broad spectrum of cargo proteins. The CSC seems to act as recruitment hub for other proteins, such as the WASH complex and TBC1D5 (Probable). Required for retrograde transport of lysosomal enzyme receptor IGF2R and SLC11A2. Required to regulate transcytosis of the polymeric immunoglobulin receptor (pIgR-pIgA) (PubMed:15078903, PubMed:15247922, PubMed:20164305). Required for endosomal localization of WASHC2C (PubMed:22070227, PubMed:28892079). Mediates the association of the CSC with the WASH complex via WASHC2 (PubMed:22070227, PubMed:24819384, PubMed:24980502). Required for the endosomal localization of TBC1D5 (PubMed:20923837) (Microbial infection) The heterotrimeric retromer cargo-selective complex (CSC) mediates the exit of human papillomavirus from the early endosome and the delivery to the Golgi apparatus","subcellular_location":"Cytoplasm; Membrane; Endosome; Early endosome; Late endosome","url":"https://www.uniprot.org/uniprotkb/Q96QK1/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/VPS35","classification":"Common Essential","n_dependent_lines":864,"n_total_lines":1208,"dependency_fraction":0.7152317880794702},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000069329","cell_line_id":"CID001488","localizations":[{"compartment":"vesicles","grade":3}],"interactors":[{"gene":"CAPZB","stoichiometry":10.0},{"gene":"VPS29","stoichiometry":10.0},{"gene":"CAPZA1","stoichiometry":10.0},{"gene":"CAPZA2","stoichiometry":10.0},{"gene":"WASH3P;WASH2P;WASH6P;WASH1;WASH4P","stoichiometry":10.0},{"gene":"KIAA1033","stoichiometry":10.0},{"gene":"VPS26A","stoichiometry":10.0},{"gene":"VPS26B","stoichiometry":10.0},{"gene":"FKBP15","stoichiometry":10.0},{"gene":"RAB7A","stoichiometry":4.0}],"url":"https://opencell.sf.czbiohub.org/target/CID001488","total_profiled":1310},"omim":[{"mim_id":"619856","title":"ANKYRIN REPEAT DOMAIN-CONTAINING PROTEIN 50; ANKRD50","url":"https://www.omim.org/entry/619856"},{"mim_id":"619135","title":"RITSCHER-SCHINZEL SYNDROME 3; RTSC3","url":"https://www.omim.org/entry/619135"},{"mim_id":"618981","title":"VPS35 ENDOSOMAL PROTEIN-SORTING FACTOR-LIKE; VPS35L","url":"https://www.omim.org/entry/618981"},{"mim_id":"615740","title":"TBC1 DOMAIN FAMILY, MEMBER 5; TBC1D5","url":"https://www.omim.org/entry/615740"},{"mim_id":"614905","title":"SORTING NEXIN 8; SNX8","url":"https://www.omim.org/entry/614905"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Endosomes","reliability":"Approved"},{"location":"Lysosomes","reliability":"Approved"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in many","driving_tissues":[],"url":"https://www.proteinatlas.org/search/VPS35"},"hgnc":{"alias_symbol":["FLJ10752","MEM3","PARK17"],"prev_symbol":[]},"alphafold":{"accession":"Q96QK1","domains":[{"cath_id":"1.25.40","chopping":"9-160","consensus_level":"medium","plddt":92.4794,"start":9,"end":160}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96QK1","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q96QK1-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q96QK1-F1-predicted_aligned_error_v6.png","plddt_mean":91.25},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=VPS35","jax_strain_url":"https://www.jax.org/strain/search?query=VPS35"},"sequence":{"accession":"Q96QK1","fasta_url":"https://rest.uniprot.org/uniprotkb/Q96QK1.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q96QK1/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96QK1"}},"corpus_meta":[{"pmid":"21763483","id":"PMC_21763483","title":"A mutation in VPS35, encoding a subunit of the retromer complex, causes late-onset Parkinson disease.","date":"2011","source":"American journal of human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/21763483","citation_count":703,"is_preprint":false},{"pmid":"21763482","id":"PMC_21763482","title":"VPS35 mutations in Parkinson disease.","date":"2011","source":"American journal of human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/21763482","citation_count":687,"is_preprint":false},{"pmid":"24819384","id":"PMC_24819384","title":"Mutation in VPS35 associated with Parkinson's disease impairs WASH complex association and inhibits autophagy.","date":"2014","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/24819384","citation_count":369,"is_preprint":false},{"pmid":"9105038","id":"PMC_9105038","title":"Endosome to Golgi retrieval of the vacuolar protein sorting receptor, Vps10p, requires the function of the VPS29, VPS30, and VPS35 gene products.","date":"1997","source":"The Journal of cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/9105038","citation_count":354,"is_preprint":false},{"pmid":"26618722","id":"PMC_26618722","title":"Parkinson's disease-associated mutant VPS35 causes mitochondrial dysfunction by recycling DLP1 complexes.","date":"2015","source":"Nature medicine","url":"https://pubmed.ncbi.nlm.nih.gov/26618722","citation_count":267,"is_preprint":false},{"pmid":"20619655","id":"PMC_20619655","title":"Vps35 mediates vesicle transport between the mitochondria and peroxisomes.","date":"2010","source":"Current biology : CB","url":"https://pubmed.ncbi.nlm.nih.gov/20619655","citation_count":247,"is_preprint":false},{"pmid":"22105352","id":"PMC_22105352","title":"VPS35 haploinsufficiency increases Alzheimer's disease neuropathology.","date":"2011","source":"The Journal of cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/22105352","citation_count":217,"is_preprint":false},{"pmid":"26203154","id":"PMC_26203154","title":"VPS35 in Dopamine Neurons Is 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Series B, Biological sciences","url":"https://pubmed.ncbi.nlm.nih.gov/38368930","citation_count":16,"is_preprint":false},{"pmid":"33997170","id":"PMC_33997170","title":"Depletion of VPS35 attenuates metastasis of hepatocellular carcinoma by restraining the Wnt/PCP signaling pathway.","date":"2020","source":"Genes & diseases","url":"https://pubmed.ncbi.nlm.nih.gov/33997170","citation_count":16,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":48861,"output_tokens":12687,"usd":0.168444,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":48752,"output_tokens":13042,"usd":0.429165,"resynth_parse_fail":true,"stage2_stop_reason":"end_turn"},"total_usd":0.597609,"stage1_batch_id":"msgbatch_01UT1AahFPCAyn2uVweS7A9z","stage2_batch_id":"msgbatch_01HuKWtKNT4Pqj1bc8eEP5RV","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1992,\n      \"finding\": \"Vps35p is a peripheral membrane protein (~80% associates with a membranous particulate fraction) required for vacuolar protein sorting; vps35 null mutants quantitatively missort and secrete carboxypeptidase Y (CPY) but retain most PrA, PrB, and ALP, indicating alternative sorting pathways exist for different vacuolar hydrolases.\",\n      \"method\": \"Gene disruption (null allele), subcellular fractionation, vacuolar protein sorting assay in S. cerevisiae\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct genetic disruption with biochemical fractionation and cargo-sorting assays; foundational study replicated by subsequent work\",\n      \"pmids\": [\"1498362\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"Vps35p, together with Vps29p and Vps30p, is required for retrieval of the vacuolar sorting receptor Vps10p from the prevacuolar endosome back to the Golgi; loss of VPS35 shifts Vps10p from the Golgi to the vacuolar membrane via a Pep12p-dependent (pre-vacuolar endosomal t-SNARE) but Sec1p-independent route; Vps35p co-fractionates with Vps10p even in vps29 mutants, suggesting direct interaction.\",\n      \"method\": \"Temperature-conditional VPS35 allele, subcellular fractionation, epistasis analysis with pep12 and sec1 mutants, co-fractionation in S. cerevisiae\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — temperature-conditional allele with biochemical fractionation, epistasis, and co-fractionation; multiple orthogonal methods in a rigorous study\",\n      \"pmids\": [\"9105038\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Crystal structure of human Vps26A (2.1-Å resolution) reveals an arrestin-fold with two curved β-sandwich domains; the Vps35-binding site maps to a mobile loop (residues 235–246) near the tip of the C-terminal domain; hydrophobic residues and a glycine in this loop are required for Vps26 integration into the retromer complex and endosomal localization, and for yeast Vps26 function in CPY sorting.\",\n      \"method\": \"X-ray crystallography, mutagenesis, endosomal localization assay, yeast CPY sorting complementation\",\n      \"journal\": \"Nature structural & molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — atomic-resolution crystal structure combined with mutagenesis and functional complementation in a single study\",\n      \"pmids\": [\"16732284\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"VPS35 interacts (indirectly) with the LRP6 intracellular domain; an N-terminal deletion mutant of VPS35 reduces canonical Wnt signaling in HEK-293 cells expressing Wnt-1, placing retromer-mediated endosomal trafficking upstream of Wnt signal transduction.\",\n      \"method\": \"GST fusion protein pulldown, luciferase Tcf reporter assay in HEK-293 cells\",\n      \"journal\": \"Neurobiology of disease\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single pulldown for interaction, single reporter assay for function; single lab, no replication\",\n      \"pmids\": [\"17239604\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"A conserved PRLYL motif in the N-terminal domain of Vps35 is critical for retromer subcomplex assembly; mutation of the corresponding R107W in human VPS35 displaces the protein to the cytosol, prevents co-precipitation with Vps26, and abrogates dominant-negative trafficking in yeast; in pancreatic β-cells the R107W mutant shifts from peripheral endosomes to a juxtanuclear compartment, altering mannose phosphate receptor and insulin distribution.\",\n      \"method\": \"Yeast dominant-negative assay, co-immunoprecipitation, subcellular fractionation, immunofluorescence in pancreatic β-cells\",\n      \"journal\": \"Traffic (Copenhagen, Denmark)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mutagenesis combined with co-IP, fractionation, and localization across two cell systems; single lab\",\n      \"pmids\": [\"17916227\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Drosophila Vps35 loss inhibits scavenger receptor ligand endocytosis, mislocalizes endocytic proteins and receptors, leads to overproliferation of blood cells (tumor suppressor function), causes upregulation of TGFβ/BMP signaling at the neuromuscular junction, and negatively regulates actin polymerization; genetic interactions indicate actin dysregulation underlies some endocytic and signaling defects.\",\n      \"method\": \"RNAi knockdown in Drosophila S2 cells and larvae, endocytosis assay, immunofluorescence, genetic interaction analysis\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal assays (endocytosis, signaling, genetic interactions) in a single study; Drosophila ortholog\",\n      \"pmids\": [\"18057029\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Retromer component Vps35, together with Vps26, is found in complex with the mitochondrial SUMO E3 ligase MAPL; Vps35 is recruited to mitochondria-derived vesicles (MDVs); silencing Vps35 or Vps26A significantly reduces delivery of MAPL from mitochondria to peroxisomes, defining a retromer-dependent mitochondria-to-peroxisome trafficking route.\",\n      \"method\": \"Unbiased co-immunoprecipitation screen, confocal imaging, siRNA knockdown, MAPL delivery assay\",\n      \"journal\": \"Current biology : CB\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP plus functional knockdown with delivery assay; single lab, two orthogonal methods\",\n      \"pmids\": [\"20619655\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"The Vps26b-Vps29-Vps35 retromer sub-complex mediates transport of sortilin from endosomes to the trans-Golgi network; Vps26b-deficient mice lack this specific complex (while the Vps26a-Vps29-Vps35 complex persists) and show ~20% increased sortilin levels, with normal SorLA.\",\n      \"method\": \"Vps26b knockout mice, co-immunoprecipitation, Western blot quantification of sortilin/SorLA\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knockout combined with biochemical assessment of cargo levels; single lab\",\n      \"pmids\": [\"21040701\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"VPS35 interacts with BACE1 (β-secretase) and promotes its endosome-to-Golgi retrieval; loss of VPS35 function in the mouse hippocampus increased BACE1 activity, enriched BACE1 in endosomes (rather than trans-Golgi), elevated Aβ levels, and accelerated Alzheimer's disease-like phenotypes in Tg2576 mice.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence, Vps35 hemizygous deletion in Tg2576 mice, BACE1 activity assay, Aβ ELISA\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP plus genetic mouse model with cargo localization and enzymatic activity assays; multiple orthogonal methods replicated across in vitro and in vivo\",\n      \"pmids\": [\"22105352\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"The WASH complex is recruited to endosomes via interaction of its FAM21 subunit's long unstructured tail with VPS35; this interaction is necessary and sufficient to target the WASH complex to endosomes; overexpression of the FAM21 tail increases cytoplasmic WASH complex and causes cell-spreading defects, implicating WASH-retromer in mobilizing membrane into the endosome-to-cell-surface pathway.\",\n      \"method\": \"Co-immunoprecipitation, endosomal localization assays, FAM21-tail overexpression cell-spreading assay\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus localization and functional overexpression assays; single lab with two orthogonal methods\",\n      \"pmids\": [\"22070227\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"VPS35 is required for retrograde trafficking of BACE1 in developing hippocampal neurons; Vps35 depletion impairs apical dendritic growth, reduces dendritic spines, and causes swollen commissural axons; suppression of BACE1 expression partially rescues both dendritic and axonal deficits, identifying BACE1 as a critical VPS35 cargo in vivo.\",\n      \"method\": \"In utero electroporation of microRNA against Vps35, immunofluorescence, dendritic/axonal morphometry, BACE1 rescue experiment in neonatal mice\",\n      \"journal\": \"Biology open\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo loss-of-function with morphometric and rescue analysis; single lab, multiple readouts\",\n      \"pmids\": [\"23259059\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"VPS35 regulates RANK trafficking; VPS35 loss alters RANKL-induced RANK distribution, enhances RANKL sensitivity, sustains RANKL signaling, and increases hyperresorptive osteoclast formation; hemizygous Vps35 deletion in mice causes hyperresorptive osteoclastogenesis, decreased bone formation, and osteoporotic deficits.\",\n      \"method\": \"VPS35 loss-of-function in osteoclast cultures and Vps35+/− mice, RANK distribution by immunofluorescence, RANKL signaling assays, micro-CT bone analysis\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic mouse model combined with cellular signaling assays; single lab, multiple orthogonal readouts\",\n      \"pmids\": [\"23509071\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"The PD-linked VPS35 D620N mutant is correctly folded and retains binding to Vps29 and Vps26A with wild-type affinity, but its expression redistributes retromer-positive endosomes to a perinuclear localization (enlarged endosomes), disrupts trafficking of cathepsin D (a CI-M6PR ligand responsible for α-synuclein degradation), while still interacting with CI-M6PR cargo.\",\n      \"method\": \"Protein folding analysis, co-immunoprecipitation, immunofluorescence subcellular localization, cathepsin D trafficking assay in cell lines and patient fibroblasts\",\n      \"journal\": \"Traffic (Copenhagen, Denmark)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple biochemical and cell-biology assays in both model lines and patient-derived cells; single lab\",\n      \"pmids\": [\"24152121\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"VPS35 D620N mutation perturbs endosome-to-TGN transport but not endosome-to-plasma membrane recycling; SILAC-based interactome comparison reveals the primary defect is a 2.2-fold decrease in affinity for FAM21 (WASH complex component), measured by isothermal calorimetry; confirmed in patient fibroblasts.\",\n      \"method\": \"SILAC-based quantitative proteomics (interactome), isothermal calorimetry, retrograde transport assay, patient fibroblast analysis\",\n      \"journal\": \"Current biology : CB\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — quantitative biophysical affinity measurement (ITC) combined with SILAC proteomics and patient-cell validation; multiple orthogonal methods in one study\",\n      \"pmids\": [\"24980502\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"VPS35 D620N mutant associates poorly with the WASH complex and impairs WASH recruitment to endosomes; autophagy is impaired in cells expressing PD-mutant VPS35 or lacking WASH; the autophagy defect is partly explained by abnormal trafficking of the autophagy protein ATG9A.\",\n      \"method\": \"Co-immunoprecipitation, endosomal localization of WASH, autophagy flux assays, ATG9A trafficking assay\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, localization, and functional autophagy/trafficking assays; replicated across multiple cell models\",\n      \"pmids\": [\"24819384\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Retromer depletion (VPS35 knockdown) increases lysosomal turnover of the mannose 6-phosphate receptor, impairs maturation of cathepsin D, and leads to accumulation of α-synuclein in lysosomes; in Drosophila, VPS35 knockdown increases detergent-insoluble α-synuclein and exacerbates locomotor impairment and neurodegeneration in α-synuclein-expressing flies.\",\n      \"method\": \"siRNA knockdown, cathepsin D maturation assay, α-synuclein solubility assay, Drosophila locomotor and eye phenotype analysis\",\n      \"journal\": \"Neurobiology of disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — biochemical maturation assays combined with in vivo Drosophila genetics; single lab\",\n      \"pmids\": [\"25107340\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Rab7 recruits retromer to late endosomes via direct interactions with N-terminal conserved regions in Vps35; association of Vps26 with Vps35 allosterically increases affinity between the Vps sub-complex and activated Rab7; a mutation disrupting the Vps35–Vps26 interaction perturbs Rab7-mediated retromer recruitment to endosomes in HeLa cells.\",\n      \"method\": \"FRET assay in HeLa cells, biophysical binding measurements, mutagenesis\",\n      \"journal\": \"Traffic (Copenhagen, Denmark)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — FRET-based in vivo interaction measurement plus biophysical binding assays and mutagenesis; single lab\",\n      \"pmids\": [\"25367362\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"VPS35 localizes to dendritic spines and is involved in trafficking of AMPA-type glutamate receptor subunits (GluA1/GluA2); VPS35 D620N acts as a loss-of-function mutation with respect to synaptic transmission and AMPAR recycling in mouse cortical neurons and iPSC-derived dopamine neurons from D620N carriers, altering excitatory synaptic transmission and AMPAR surface expression.\",\n      \"method\": \"Immunofluorescence localization, electrophysiology (mEPSC recording), AMPAR surface expression assay, iPSC-derived neuron model\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — electrophysiology combined with surface expression assays in mouse neurons and patient-derived iPSC neurons; single lab\",\n      \"pmids\": [\"25416282\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Genetic interaction between VPS35 and EIF4G1 in yeast and worm models: EIF4G1 upregulation causes protein misfolding defects rescued by sortilin expression downstream of VPS35, placing sortilins in a VPS35-dependent pathway; interactions extend to α-synuclein pathobiology.\",\n      \"method\": \"Yeast genetic modifier screen, epistasis analysis, C. elegans and transgenic mouse models\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis across multiple model organisms; single lab\",\n      \"pmids\": [\"25533483\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"VPS35 deficiency or D620N mutation in dopamine neurons impairs endosome-to-Golgi retrieval of Lamp2a (CMA receptor), accelerating Lamp2a degradation; this reduces chaperone-mediated autophagy and leads to α-synuclein accumulation; re-expression of Lamp2a in VPS35-deficient neurons reduces α-synuclein, establishing a VPS35–Lamp2a–α-synuclein pathway.\",\n      \"method\": \"Conditional Vps35 knockout in DA neurons, endosome-to-Golgi trafficking assay for Lamp2a, immunofluorescence, CMA assay, α-synuclein quantification, Lamp2a rescue experiment\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic knockout combined with trafficking assays, biochemical quantification, and rescue experiment; multiple orthogonal methods\",\n      \"pmids\": [\"26203154\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"VPS35 deficiency or D620N mutation increases mitochondrial E3 ubiquitin ligase MUL1, leading to ubiquitin-mediated degradation of mitofusin 2 (MFN2), mitochondrial fragmentation, and DA neuron loss; suppression of MUL1 rescues MFN2 levels and DA neuron loss but not α-synuclein accumulation.\",\n      \"method\": \"Conditional Vps35 KO in DA neurons, MUL1/MFN2 Western blot, MUL1 siRNA rescue, immunofluorescence of mitochondrial morphology\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic knockout with molecular pathway dissection (MUL1→MFN2), rescue experiment, and multiple readouts; single lab with rigorous controls\",\n      \"pmids\": [\"26321632\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"PD-associated VPS35 mutants (D620N) cause mitochondrial fragmentation and cell death through increased interaction with dynamin-like protein 1 (DLP1/Drp1), enhancing turnover of mitochondrial DLP1 complexes via MDV-dependent trafficking to lysosomes; oxidative stress increases VPS35–DLP1 interaction; inhibition of mitochondrial fission prevents VPS35 mutant-induced mitochondrial deficits; VPS35–DLP1 interaction is increased in brains of sporadic PD cases.\",\n      \"method\": \"Co-immunoprecipitation, mitochondrial morphology analysis, cell death assay, DLP1 complex turnover assay, fission inhibitor rescue, brain tissue Co-IP from sporadic PD cases\",\n      \"journal\": \"Nature medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, functional rescue with fission inhibitor, multiple cell models (neurons in vitro/in vivo, patient fibroblasts, human brain tissue); replicated across systems\",\n      \"pmids\": [\"26618722\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"VPS35 deficiency impairs dendritic spine maturation and decreases glutamatergic transmission; VPS35 interacts with AMPA receptor subunits GluA1 and GluA2; GluA1 and GluA2 are significantly reduced in synaptosomal and PSD fractions from VPS35-deficient brain; GluA2 overexpression (but not GluA1) partially restores spine maturation in VPS35-deficient neurons.\",\n      \"method\": \"Co-immunoprecipitation, synaptosomal fractionation, surface AMPAR quantification, dendritic spine analysis, rescue overexpression\",\n      \"journal\": \"Molecular brain\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP combined with biochemical fractionation, spine morphometry, and rescue experiment; single lab\",\n      \"pmids\": [\"26521016\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"VPS29 and VPS35 form a biologically stable sub-complex in vivo; deficiency of VPS35 or VPS29 causes degradation of the other retromer subunits, whereas VPS26 deficiency does not affect VPS29 and VPS35 levels; VPS26–VPS35 sub-complex is more susceptible to ubiquitin-proteasome degradation than VPS29–VPS35.\",\n      \"method\": \"siRNA knockdown of individual subunits, Western blot, in vitro sub-complex formation assay, proteasome inhibitor treatment\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal knockdown with biochemical stability assays and in vitro reconstitution; single lab\",\n      \"pmids\": [\"25937119\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"VPS35 binds farnesylated (but not palmitoylated or GTP-loaded) N-Ras in the cytosol as part of a high-molecular-weight complex; VPS35 silencing increases N-Ras association with cytoplasmic vesicles, diminishes GTP loading of Ras, and inhibits MAPK signaling and growth of N-Ras-dependent melanoma cells.\",\n      \"method\": \"Affinity purification and mass spectrometry, co-immunoprecipitation, N-Ras GTP-loading assay, MAPK signaling assay, cell growth assay with VPS35 siRNA\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — MS-identified interaction confirmed by Co-IP with farnesyl-dependence test and functional downstream assays; single lab\",\n      \"pmids\": [\"27502489\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Vps35 regulates recycling of Trem2 from endosomes to the plasma membrane in microglia; Trem2 is internalized via clathrin-dependent endocytosis and recycled through Vps35 (not Rab11); Vps35 knockdown causes Trem2 accumulation in lysosomes without degradation and leads to excessive LPS-induced iNOS/IL-6 pro-inflammatory responses; AD-associated R47H Trem2 mutant fails to interact with Vps35 and is unstable.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, immunofluorescence, clathrin inhibition assay, inflammatory cytokine measurement, Trem2 overexpression rescue\",\n      \"journal\": \"Traffic (Copenhagen, Denmark)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus functional knockdown with cargo localization and inflammatory readouts; single lab\",\n      \"pmids\": [\"27717139\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"VPS35 interacts with dopamine receptor D1 (DRD1) and promotes its recycling to the cell surface after endocytosis; VPS35 overexpression/knockdown increases/decreases DRD1 surface levels and downstream CREB/ERK phosphorylation; the D620N mutant retains DRD1 binding but fails to promote DRD1 recycling or rescue CREB/ERK signaling.\",\n      \"method\": \"Co-immunoprecipitation, surface receptor recycling assay, CREB/ERK phosphorylation Western blot, VPS35 overexpression and siRNA knockdown\",\n      \"journal\": \"Neurobiology of aging\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP combined with recycling and signaling assays; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"27460146\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Parkinson's disease-associated Vps35 R524W variant (but not P316S) is a loss-of-function mutation: it shows reduced association with the retromer regulatory network and dysregulated endosomal receptor sorting; R524W expression causes intracellular α-synuclein-positive aggregate accumulation; R55 small molecule partially rescues R524W endosomal association.\",\n      \"method\": \"Co-immunoprecipitation, endosomal localization assay, α-synuclein immunofluorescence, pharmacological rescue with R55\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with functional cargo-sorting and localization assays; single lab\",\n      \"pmids\": [\"27385586\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"A conserved FLV motif in the C-terminus of DLP1 mediates interaction with VPS35; a decoy peptide based on this motif blocks VPS35–DLP1 interaction, inhibits recycling of mitochondrial DLP1 complexes, and rescues D620N-induced mitochondrial fragmentation and respiratory deficits in both M17 cells and patient fibroblasts.\",\n      \"method\": \"Mutagenesis of FLV motif, Co-IP, decoy peptide treatment, mitochondrial morphology and respiration assays in cell lines and patient fibroblasts\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — motif mutagenesis identifying specific interaction site combined with peptide inhibitor rescue in patient-derived cells; mechanistic and translational validation\",\n      \"pmids\": [\"28040727\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Drosophila Vps35 loss affects synaptic vesicle recycling and dopaminergic synaptic release; dLRRK together with Rab5 and Rab11 participates in the same synaptic vesicle recycling pathway; manipulation of dLRRK/Rab5/Rab11 activity improves vps35 synaptic phenotypes, placing VPS35 and LRRK2 in a common endosomal synaptic vesicle recycling pathway.\",\n      \"method\": \"Drosophila genetics, synaptic vesicle recycling assay, dopamine release measurement, genetic interaction analysis\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis with functional synaptic assays in Drosophila; single lab\",\n      \"pmids\": [\"28482024\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"VPS35 promotes lysosomal clearance of the parkin substrate AIMP2; VPS35 co-immunoprecipitates with AIMP2 and Lamp2a; D620N mutation disrupts VPS35–AIMP2 and VPS35–Lamp2a interactions; VPS35 overexpression prevents AIMP2-induced PARP1-dependent cell death; VPS35 knockdown causes AIMP2-dependent PARP1 activation and cell death.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, VPS35 overexpression, PARP1 activation and cell death assays\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with functional knockdown/overexpression and cell death assays; single lab\",\n      \"pmids\": [\"28383562\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"VPS35 D620N mutation causes defects in complex I (and II) enzymatic activity and mitochondrial respiratory chain assembly (assembled complexes and supercomplexes reduced) in patient fibroblasts; these deficits are rescued by inhibition of mitochondrial fission, linking excessive fission downstream of D620N to bioenergetic impairment.\",\n      \"method\": \"Complex I/II enzymatic activity assay, Blue Native PAGE for assembled complexes, Seahorse respirometry, fission inhibitor rescue in patient fibroblasts\",\n      \"journal\": \"Biochimica et biophysica acta. Molecular basis of disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple biochemical assays in patient-derived cells with mechanistic rescue; single lab\",\n      \"pmids\": [\"28765075\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"VPS35 D620N knock-in mutation strikingly elevates LRRK2-mediated phosphorylation of Rab8A, Rab10, and Rab12 in mouse embryonic fibroblasts and in vivo mouse tissues; LRRK2-mediated Rab10 phosphorylation is increased in neutrophils and monocytes from D620N PD patients versus controls; VPS35 knockout/knockdown suppresses LRRK2-mediated Rab phosphorylation in wild-type, LRRK2[R1441C], and VPS35[D620N] cells, indicating VPS35 controls LRRK2 kinase activity.\",\n      \"method\": \"Knock-in mouse model, phospho-Rab ELISA and Western blot, patient-derived neutrophil/monocyte analysis, VPS35 siRNA/knockout in multiple cell lines\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — knock-in animal model combined with patient-derived cell analysis and genetic knockdown across multiple cell lines; replicated across cell types and tissues\",\n      \"pmids\": [\"29743203\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Parkin directly ubiquitinates VPS35 via attachment of an atypical poly-ubiquitin chain to three C-terminal lysine residues; familial parkin mutations impair VPS35 ubiquitination; ubiquitination does not promote proteasomal degradation of VPS35; parkin knockdown in cortical neurons selectively disrupts vesicular sorting of ATG9A (a WASH-dependent retromer cargo); WASH complex components are markedly decreased in brains of parkin knockout mice.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, mass spectrometry identification of ubiquitinated lysines, parkin KO mouse brain analysis, ATG9A trafficking assay\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro ubiquitination assay with MS-level site identification, genetic KO model, and functional cargo-sorting assay; multiple orthogonal methods\",\n      \"pmids\": [\"29893854\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"VPS35 dysfunction (D620N or siRNA knockdown) impairs retromer-mediated DMT1 (divalent metal transporter 1) trafficking to the trans-Golgi network, redirecting DMT1 to lysosomes and shifting intracellular iron distribution from Golgi-dominant to lysosome-enriched; treatment with retromer stabilizer R55 restores Golgi-dominant iron distribution.\",\n      \"method\": \"Fluorescent probe (Gol-SiRhoNox) for Golgi-specific Fe(II) detection combined with LysoRhoNox for lysosomal Fe(II), synchronous imaging, VPS35 dysfunction induction, R55 pharmacological rescue\",\n      \"journal\": \"Chemical science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — novel orthogonal fluorescent probes for subcellular iron imaging with functional perturbation and pharmacological rescue; single lab\",\n      \"pmids\": [\"30809369\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Loss of iPLA2-VIA (Drosophila PLA2G6 homolog) impairs retromer function by reducing interaction with Vps35 and Vps26, leading to progressive ceramide elevation and neurodegeneration; similar defects are observed upon loss of vps26 or vps35, or overexpression of α-synuclein.\",\n      \"method\": \"Co-immunoprecipitation, genetic epistasis in Drosophila, lipidomic analysis, ceramide-reducing drug rescue\",\n      \"journal\": \"Cell metabolism\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus genetic epistasis and lipid biochemistry across multiple models; single lab\",\n      \"pmids\": [\"29909971\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"VPS35 regulates tau phosphorylation through cathepsin D availability; VPS35 overexpression reduces pathological tau in neuronal cells; VPS35 silencing causes tau accumulation; mechanistically, VPS35 controls the availability of active cathepsin D, which mediates tau degradation; VPS35 knockdown in a tauopathy mouse model exacerbates tau accumulation and motor/learning impairments.\",\n      \"method\": \"VPS35 overexpression/siRNA in neuronal cells, cathepsin D activity assay, tau phosphorylation Western blot, tauopathy mouse model with AAV-mediated VPS35 knockdown\",\n      \"journal\": \"Molecular psychiatry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro and in vivo genetic manipulation with mechanistic cathepsin D assay; single lab\",\n      \"pmids\": [\"31289348\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"In Arabidopsis, VPS35 interaction with the RAB7 homolog RABG3f-GTP acts as a checkpoint controlling HOPS complex assembly and fusion of late endosomal compartments with the vacuole; the synthetic molecule Endosidin17 targets VPS35 and prevents this interaction, blocking retromer endosome anchoring.\",\n      \"method\": \"Multiple target identification techniques, genetic analysis, co-immunoprecipitation, chemical biology with Endosidin17\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — plant (Arabidopsis) ortholog; while mechanistically informative for RAB7-VPS35 interaction, context is plant vacuolar trafficking rather than mammalian retromer; limited direct relevance to mammalian VPS35 mechanism\",\n      \"pmids\": [\"31570580\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Vps35 deficiency in pyramidal neurons increases sortilin1 (Sort1) in lysosomes and causes lysosomal dysfunction; suppression of Sort1 diminishes Vps35-KO-induced dendritic defects; lysosomal Sort1 expression recapitulates Vps35-KO phenotypes, identifying Sort1 as a key cargo whose missorting to lysosomes mediates neurodegenerative pathology.\",\n      \"method\": \"Conditional Vps35 KO, Sort1 immunofluorescence in lysosomes, Sort1 siRNA rescue, Sort1 overexpression phenocopy, lysosomal function assay\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO with cargo localization, siRNA rescue, and overexpression phenocopy; single lab\",\n      \"pmids\": [\"31907392\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Vps35 deficiency increases p35 levels and Cdk5/p35 kinase activity by impairing lysosomal degradation of p35; roscovitine (Cdk5 inhibitor) reduces hyperphosphorylated tau induced by Vps35 deficiency; Cdk5/p35 acts as a VPS35 cargo, co-immunoprecipitating with VPS35.\",\n      \"method\": \"Co-immunoprecipitation, p35/Cdk5 Western blot, roscovitine pharmacological rescue, lysosome marker co-localization, tau phosphorylation assay in retinal ganglion cells\",\n      \"journal\": \"Investigative ophthalmology & visual science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus pharmacological rescue with multiple biochemical readouts; single lab\",\n      \"pmids\": [\"31995153\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"VPS35 D620N mutation in iPSC-derived neurons causes decreased autophagic flux, reduced lysosomal mass, α-synuclein accumulation, mitochondrial dysfunction (reduced membrane potential, impaired respiration, increased ROS), and defective mitophagy.\",\n      \"method\": \"iPSC reprogramming from D620N patient, dopaminergic neuron differentiation, autophagy flux assay, lysosomal staining, mitochondrial respiration (Seahorse), ROS measurement, mitophagy assay\",\n      \"journal\": \"Movement disorders\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — patient-derived iPSC model with multiple orthogonal functional assays; single lab\",\n      \"pmids\": [\"33142012\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"VPS35 D620N mutant reduces mitochondrial membrane potential at steady state, desensitizes mitochondria to CCCP-induced potential collapse, inhibits PINK1 accumulation at the outer mitochondrial membrane, and consequently impairs Parkin recruitment and PINK1/Parkin-dependent mitophagy initiation.\",\n      \"method\": \"CRISPR-Cas9 heterozygous D620N knock-in in SH-SY5Y cells, CCCP treatment, mitochondrial membrane potential assay (JC-1), PINK1/Parkin localization by immunofluorescence, mitophagy assessment\",\n      \"journal\": \"Translational neurodegeneration\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — endogenous knock-in model with functional mitochondrial and mitophagy assays; single lab\",\n      \"pmids\": [\"34127073\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"VPS35 D620N knock-in mice at 14 months recapitulate cardinal PD features including progressive motor deficits, DA and metabolite changes in striatum, nigrostriatal neuron degeneration, neuroinflammation, and α-synuclein accumulation; mechanistically, D620N induces mitochondrial fragmentation and dysfunction through enhanced VPS35–DLP1 interaction and increased DLP1 complex turnover in vivo.\",\n      \"method\": \"VPS35 D620N knock-in mouse model, aging cohort analysis, motor behavior, immunohistochemistry, DA HPLC, mitochondrial morphology, Co-IP for VPS35–DLP1 in aged mice\",\n      \"journal\": \"Aging cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — knock-in mouse model with comprehensive behavioral, pathological, and mechanistic characterization; replicates and extends in vivo findings from multiple labs\",\n      \"pmids\": [\"33745227\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"The Vps35 D620N variant reduces the capacity of retromer to form endosome transport carriers; Vps35 D620N cells show impaired CI-M6PR endosome-to-TGN transport due to reduced binding to the WASH complex and SNX3 (both required for transport carrier formation); endosomes are smaller and rounder with fewer tubular branches.\",\n      \"method\": \"Vps35 D620N rescue cell model (retromer KO background), CI-M6PR trafficking assay, endosome morphology analysis (electron microscopy/confocal), Co-IP for WASH and SNX3\",\n      \"journal\": \"Traffic (Copenhagen, Denmark)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — isogenic rescue cell model with trafficking assay, morphological analysis, and protein interaction assays; single lab\",\n      \"pmids\": [\"33347683\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Upon specific mtDNA damage, VPS35 mediates maturation of early endosomes to late autophagy vesicles where mitochondrial nucleoids are degraded; the ATAD3–SAMM50 axis controls nucleoid release from mitochondria, with SAMM50 acting as a gatekeeper for BAK clustering and nucleoid transfer to endosomes; this defines a non-canonical endosomal-mitophagy pathway for selective mtDNA turnover.\",\n      \"method\": \"Proximity labeling with Twinkle (nucleoid marker), VPS35 knockdown, ATAD3/SAMM50 genetic perturbation, lysosomal inhibition, ATG5 knockout, mtDNA copy number analysis, rapamycin treatment in mouse model\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — proximity labeling combined with genetic perturbations and in vivo mouse model; single lab with multiple orthogonal approaches\",\n      \"pmids\": [\"36344526\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"VPS35 D620N mutation alters expression of ~220 lysosomal proteins and drives LRRK2-mediated phosphorylation of Rab proteins at the lysosome, recruiting the phospho-Rab effector RILPL1 to the lysosome where it binds the lysosomal integral membrane protein TMEM55B; D620N reduces RILPL1 levels in a manner reversed by LRRK2 inhibition and proteasome inhibitors; RILPL1 knockout enhances Rab substrate phosphorylation; TMEM55B knockout increases RILPL1 levels.\",\n      \"method\": \"Quantitative lysosomal proteomics, phospho-Rab Western blot, Co-IP of RILPL1-TMEM55B, mutagenesis of interaction interface, LRRK2 inhibitor treatment, RILPL1/TMEM55B knockout mice\",\n      \"journal\": \"Science advances\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — quantitative proteomics combined with mutagenesis, Co-IP, genetic knockouts, and pharmacological rescue across multiple tissues and cell types\",\n      \"pmids\": [\"38091401\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"VPS35 selectively binds endocytosed EGFR in early endosomes and recycles it to the cell surface, activating downstream ERK1/2 signaling; VPS35 promotes gastric cancer cell proliferation through EGFR recycling; high VPS35 expression increases sensitivity to EGFR inhibitors in xenograft and organoid models.\",\n      \"method\": \"Co-immunoprecipitation, biotin surface assay, EGFR recycling assay, ERK1/2 phosphorylation Western blot, patient-derived xenograft and organoid models\",\n      \"journal\": \"EBioMedicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP combined with surface recycling assay and in vivo models; single lab\",\n      \"pmids\": [\"36738481\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"LRRK2 kinase inhibition (MLi-2) normalizes striatal dopamine transporter (DAT) expression and function, and abolishes amphetamine-induced hyperlocomotion in VPS35 D620N knock-in mice, but not in VPS35 haploinsufficient mice; D620N elevates LRRK2-mediated phosphorylation of Rab10, Rab12, and Rab29, while haploinsufficiency reduces Rab12 phosphorylation, demonstrating VPS35 and LRRK2 functionally interact to regulate DAT function and dopamine transmission.\",\n      \"method\": \"VPS35 D620N knock-in and haploinsufficient mice, LRRK2 kinase inhibitor (MLi-2) treatment, phospho-Rab Western blot, fast-scan cyclic voltammetry, behavioral locomotion assay\",\n      \"journal\": \"NPJ Parkinson's disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple genetic mouse models with pharmacological intervention and functional dopamine physiology assays; single lab\",\n      \"pmids\": [\"38110354\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"VPS35 is the central cargo-recognition subunit of the retromer complex that retrieves transmembrane cargo proteins (including CI-M6PR, BACE1, Lamp2a, DRD1, EGFR, RANK, Trem2, and sortilin) from endosomes to the trans-Golgi network or plasma membrane by forming a stable trimer with VPS26 (which has an arrestin fold and binds VPS35 via a conserved C-terminal loop) and VPS29, and by recruiting the actin-nucleating WASH complex through a direct VPS35–FAM21 interaction; the pathogenic D620N mutation primarily reduces VPS35 affinity for FAM21, impairing WASH-dependent endosomal tubule formation and cargo sorting, and also hyperactivates LRRK2 kinase (elevating Rab8A/Rab10/Rab12 phosphorylation and triggering a RILPL1–TMEM55B lysosomal assembly), increases VPS35 interaction with the mitochondrial fission GTPase DLP1 to enhance DLP1 complex turnover and mitochondrial fragmentation (via MDV-to-lysosome trafficking), impairs PINK1/Parkin-mediated mitophagy, and disrupts lysosomal degradation of cargoes including Lamp2a (reducing CMA and α-synuclein clearance), ATG9A, and AIMP2; VPS35 is also ubiquitinated on C-terminal lysines by parkin in a non-degradative manner that modulates retromer-dependent sorting, and it mediates a retromer-dependent mitochondria-to-peroxisome trafficking route for the MAPL ligase.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"VPS35 is the central cargo-recognition subunit of the retromer complex, an evolutionarily conserved machinery that retrieves transmembrane cargo from endosomes to the trans-Golgi network or plasma membrane [#0, #1]. It assembles into a stable trimer with VPS29 and VPS26: VPS35 and VPS29 form a biologically stable sub-complex whose subunits stabilize each other, while VPS26 binds VPS35 through a mobile C-terminal loop of its arrestin fold [#2, #23]. Retromer is recruited to late endosomes by activated Rab7, an interaction allosterically enhanced by VPS26 association with VPS35 [#16], and a conserved N-terminal PRLYL/R107 motif is essential for sub-complex assembly [#4]. VPS35 drives endosomal tubule and transport-carrier formation by directly binding the FAM21 subunit of the actin-nucleating WASH complex and SNX3 [#9, #43]. Through this machinery VPS35 sorts a broad cargo repertoire including the CI-M6PR/cathepsin D axis, BACE1, sortilin, Lamp2a, Trem2, DRD1, DMT1, and EGFR, linking retromer to amyloid processing, chaperone-mediated autophagy, microglial inflammation, dopaminergic signaling, iron handling, and receptor-driven proliferation [#7, #8, #12, #19, #25, #26, #34, #46]. Beyond canonical sorting, VPS35 participates in a retromer-dependent mitochondria-to-peroxisome route delivering the MAPL ligase via mitochondria-derived vesicles [#6] and in non-canonical endosomal turnover of damaged mitochondrial nucleoids [#44]. The Parkinson's-disease mutation D620N is correctly folded and retains VPS29/VPS26 binding but selectively weakens VPS35 affinity for FAM21, impairing WASH recruitment, endosome-to-TGN transport, and cargo sorting [#12, #13, #14, #43]; D620N additionally hyperactivates LRRK2 kinase to elevate Rab8A/Rab10/Rab12 phosphorylation and assemble a RILPL1\\u2013TMEM55B lysosomal module [#32, #45], increases VPS35 interaction with the fission GTPase DLP1 to drive mitochondrial fragmentation and bioenergetic failure [#21, #28, #31, #42], and impairs PINK1/Parkin mitophagy [#41]. VPS35 is itself ubiquitinated on C-terminal lysines by parkin in a non-degradative manner that supports WASH-dependent sorting of cargoes such as ATG9A [#33]. VPS35 mutations cause autosomal-dominant Parkinson's disease, and D620N knock-in mice recapitulate cardinal PD features [#42].\",\n  \"teleology\": [\n    {\n      \"year\": 1992,\n      \"claim\": \"Established that VPS35 is required for vacuolar protein sorting, defining its foundational role in routing hydrolases to the lysosome/vacuole.\",\n      \"evidence\": \"Gene disruption with subcellular fractionation and CPY sorting assays in S. cerevisiae\",\n      \"pmids\": [\"1498362\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not identify the molecular partners or cargo-recognition mechanism\", \"Cargo specificity (only CPY missorted) left alternative pathways undefined\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Defined VPS35 as a receptor-retrieval factor that returns the sorting receptor Vps10p from the endosome to the Golgi, framing retromer as a retrograde recycling machine.\",\n      \"evidence\": \"Temperature-conditional allele, fractionation, epistasis, and co-fractionation in yeast\",\n      \"pmids\": [\"9105038\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct VPS35\\u2013receptor binding inferred from co-fractionation, not demonstrated structurally\", \"Mechanism of subunit assembly not resolved\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Resolved how VPS26 integrates into retromer, mapping VPS35 binding to an arrestin-fold loop and linking complex assembly to endosomal localization and cargo sorting.\",\n      \"evidence\": \"X-ray crystallography, mutagenesis, and yeast CPY complementation\",\n      \"pmids\": [\"16732284\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structure of full VPS35 and the cargo-binding surface not solved\", \"Did not address mammalian disease cargo\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Identified the N-terminal PRLYL/R107 motif as critical for retromer sub-complex assembly, showing assembly defects displace VPS35 to the cytosol and disrupt receptor distribution.\",\n      \"evidence\": \"Yeast dominant-negative assay, co-IP, fractionation, and \\u03b2-cell immunofluorescence\",\n      \"pmids\": [\"17916227\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab characterization of the R107W variant\", \"Functional consequence for specific mammalian cargo limited\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Extended retromer beyond endosome-to-Golgi sorting by showing VPS35/VPS26 mediate a mitochondria-to-peroxisome route for MAPL via mitochondria-derived vesicles.\",\n      \"evidence\": \"Unbiased Co-IP screen, confocal imaging, siRNA knockdown, and MAPL delivery assay\",\n      \"pmids\": [\"20619655\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether VPS35 directly recognizes MAPL cargo not established\", \"Single-lab finding without reciprocal in vivo validation\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Connected VPS35 to Alzheimer pathology by demonstrating it retrieves BACE1 from endosomes, with loss elevating A\\u03b2 in vivo.\",\n      \"evidence\": \"Reciprocal Co-IP, Vps35 hemizygous Tg2576 mice, BACE1 activity, and A\\u03b2 ELISA\",\n      \"pmids\": [\"22105352\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct vs indirect BACE1 binding not fully resolved\", \"Did not address PD-mutant effect on this cargo\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Identified the direct VPS35\\u2013FAM21 interaction as the mechanism recruiting the WASH actin machinery to endosomes, coupling retromer to actin-dependent carrier formation.\",\n      \"evidence\": \"Co-IP, endosomal localization, and FAM21-tail overexpression cell-spreading assay\",\n      \"pmids\": [\"22070227\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Binding interface on VPS35 not mapped at residue level here\", \"Did not test disease mutations\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Showed the PD-linked D620N mutant is folded and retains VPS29/VPS26 binding yet redistributes endosomes and disrupts cathepsin D trafficking, reframing D620N as a sorting defect rather than a folding defect.\",\n      \"evidence\": \"Folding analysis, Co-IP, localization, and cathepsin D trafficking in cells and patient fibroblasts\",\n      \"pmids\": [\"24152121\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"The specific interaction lost was not yet identified\", \"Mechanism linking cathepsin D defect to \\u03b1-synuclein not directly shown\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Pinpointed the primary D620N defect as a ~2-fold reduced FAM21 affinity that selectively impairs endosome-to-TGN transport and WASH-dependent autophagy/ATG9A trafficking.\",\n      \"evidence\": \"SILAC interactome and ITC affinity measurement plus autophagy/ATG9A and WASH localization assays in patient fibroblasts\",\n      \"pmids\": [\"24980502\", \"24819384\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not explain mitochondrial or LRRK2 phenotypes of D620N\", \"Quantitative link from reduced FAM21 affinity to neurodegeneration unresolved\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Established the membrane-recruitment logic of retromer by showing Rab7 binds VPS35 N-terminal regions and VPS26 allosterically boosts this affinity.\",\n      \"evidence\": \"FRET in HeLa cells, biophysical binding assays, and mutagenesis\",\n      \"pmids\": [\"25367362\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Structural basis of the Rab7\\u2013VPS35 interface not resolved\", \"Single-lab measurement\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Linked VPS35 cargo sorting directly to \\u03b1-synuclein clearance by showing it retrieves the CMA receptor Lamp2a, with rescue restoring \\u03b1-synuclein degradation.\",\n      \"evidence\": \"Conditional Vps35 KO in DA neurons, Lamp2a trafficking and CMA assays, and Lamp2a rescue\",\n      \"pmids\": [\"26203154\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether VPS35 binds Lamp2a directly not established\", \"Relative contribution of CMA vs other clearance routes unquantified\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Defined mitochondrial pathways downstream of VPS35 dysfunction: enhanced DLP1 interaction driving fission and MUL1-mediated MFN2 degradation causing DA neuron loss.\",\n      \"evidence\": \"Co-IP, fission-inhibitor rescue, MUL1 siRNA rescue, and brain tissue analysis from PD cases\",\n      \"pmids\": [\"26618722\", \"26321632\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How a retromer cargo-sorting protein engages mitochondrial fission machinery mechanistically unclear\", \"MUL1 and DLP1 axes not fully reconciled\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Implicated VPS35 in synaptic function via trafficking of AMPA receptor subunits, with D620N behaving as loss-of-function for synaptic transmission.\",\n      \"evidence\": \"Co-IP, electrophysiology, surface AMPAR assays in mouse and D620N iPSC neurons, and rescue overexpression\",\n      \"pmids\": [\"25416282\", \"26521016\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct vs adaptor-mediated AMPAR binding not resolved\", \"Single-lab synaptic measurements\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Broadened the cargo repertoire to Trem2 and DRD1 recycling, connecting VPS35 to microglial inflammation and dopaminergic signaling, with D620N selectively failing recycling.\",\n      \"evidence\": \"Co-IP, recycling assays, inflammatory cytokine and CREB/ERK readouts with knockdown/overexpression\",\n      \"pmids\": [\"27717139\", \"27460146\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct cargo-binding interfaces not mapped\", \"Single-lab studies for each cargo\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Mapped the DLP1\\u2013VPS35 interaction to a conserved DLP1 FLV motif and demonstrated decoy-peptide rescue of D620N mitochondrial defects, providing mechanistic and translational validation.\",\n      \"evidence\": \"Motif mutagenesis, Co-IP, decoy peptide, and respiration assays in cells and patient fibroblasts\",\n      \"pmids\": [\"28040727\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Why D620N increases this interaction at the structural level unexplained\", \"In vivo efficacy of peptide not tested here\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Revealed that VPS35 controls LRRK2 kinase activity, with D620N strikingly elevating LRRK2-mediated Rab8A/Rab10/Rab12 phosphorylation in vivo and in patient cells.\",\n      \"evidence\": \"D620N knock-in mice, phospho-Rab assays, patient neutrophils/monocytes, and VPS35 knockdown across cell lines\",\n      \"pmids\": [\"29743203\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism by which VPS35 regulates LRRK2 not defined\", \"Link between Rab hyperphosphorylation and cargo sorting unresolved\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Showed parkin directly ubiquitinates VPS35 on C-terminal lysines in a non-degradative manner required for WASH-dependent ATG9A sorting, integrating two PD genes.\",\n      \"evidence\": \"Ubiquitination assay, MS site identification, parkin KO mouse brain, and ATG9A trafficking\",\n      \"pmids\": [\"29893854\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How atypical ubiquitin chains alter retromer function mechanistically unclear\", \"Functional consequence beyond ATG9A not surveyed\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Demonstrated that missorting of specific cargoes (sortilin1, Cdk5/p35) to lysosomes upon VPS35 loss drives neurodegenerative phenotypes, with cargo suppression rescuing defects.\",\n      \"evidence\": \"Conditional Vps35 KO, cargo lysosomal localization, siRNA rescue/phenocopy, and Cdk5 inhibitor rescue\",\n      \"pmids\": [\"31907392\", \"31995153\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct cargo-binding for each not established\", \"Single-lab models\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Connected D620N to impaired PINK1/Parkin mitophagy by showing it inhibits PINK1 stabilization and Parkin recruitment, and reproduced cardinal PD pathology in aged knock-in mice.\",\n      \"evidence\": \"CRISPR D620N knock-in cells with mitophagy assays and aged D620N knock-in mouse phenotyping with DLP1 Co-IP\",\n      \"pmids\": [\"34127073\", \"33745227\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Causal ordering of fission, bioenergetic and mitophagy defects unresolved\", \"Mechanism by which D620N blocks PINK1 accumulation unclear\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Resolved the lysosomal arm of D620N signaling, showing LRRK2-driven phospho-Rabs recruit RILPL1 to TMEM55B at the lysosome and reshape the lysosomal proteome.\",\n      \"evidence\": \"Quantitative lysosomal proteomics, Co-IP, interface mutagenesis, LRRK2 inhibition, and RILPL1/TMEM55B knockout mice\",\n      \"pmids\": [\"38091401\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological consequence of the RILPL1\\u2013TMEM55B module for neurodegeneration unclear\", \"Connection to retromer cargo sorting not directly drawn\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Demonstrated in vivo that LRRK2 kinase inhibition normalizes dopamine transporter function specifically in D620N (not haploinsufficient) mice, establishing a functional VPS35\\u2013LRRK2 axis governing dopamine transmission.\",\n      \"evidence\": \"D620N and haploinsufficient mice, MLi-2 treatment, phospho-Rab blots, voltammetry, and behavior\",\n      \"pmids\": [\"38110354\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether DAT is a direct retromer cargo not shown\", \"Distinct phenotypes of gain-of-function D620N vs haploinsufficiency mechanistically separate\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How a single D620N substitution simultaneously weakens FAM21 binding, hyperactivates LRRK2 kinase, and rewires mitochondrial fission remains mechanistically unresolved at the structural level.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structure explaining D620N gain-of-function toward LRRK2 and DLP1\", \"The molecular link between cytosolic retromer sorting and mitochondrial/lysosomal phenotypes is not unified\", \"Direct cargo-binding surfaces on VPS35 for most named cargoes remain unmapped\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [1, 9, 43]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [2, 23]},\n      {\"term_id\": \"GO:0038024\", \"supporting_discovery_ids\": [1, 8, 26]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [9, 16, 43, 46]},\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [1, 8, 34]},\n      {\"term_id\": \"GO:0005764\", \"supporting_discovery_ids\": [25, 38, 45]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [6, 21, 44]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0, 4, 24]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [0, 1, 8, 19]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [6, 9, 43, 46]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [14, 33, 40, 44]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [21, 32, 42, 45]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [26, 46, 47]}\n    ],\n    \"complexes\": [\"retromer (VPS35\\u2013VPS29\\u2013VPS26)\", \"WASH complex (via FAM21)\"],\n    \"partners\": [\"VPS29\", \"VPS26\", \"FAM21\", \"VPS10/sortilin\", \"DLP1\", \"BACE1\", \"Rab7\", \"SNX3\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":9,"faith_total":9,"faith_pct":100.0}}