{"gene":"WDR45","run_date":"2026-06-11T09:02:06","timeline":{"discoveries":[{"year":2018,"finding":"ATG2A forms a rod-shaped complex with WIPI4 (WDR45). ATG2A can bridge neighboring vesicles through interactions at each tip; WIPI4 binds to one tip, enabling the ATG2A-WIPI4 complex to specifically tether PI3P-containing vesicles to PI3P-free vesicles, suggesting a role in ER-phagophore association and lipid membrane transfer during phagophore expansion.","method":"Single-particle electron microscopy, chemical cross-linking coupled with mass spectrometry, biochemical tethering assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Strong — structural EM plus cross-linking MS plus biochemical reconstitution of tethering activity in a single study; independently supported by a companion paper (PMID:30766969)","pmids":["30185561","30766969"],"is_preprint":false},{"year":2017,"finding":"WIPI4 (WDR45) scaffolds LKB1-AMPK-ULK1 signaling for autophagy control: in response to LKB1-mediated AMPK stimulation, WIPI4 is released from a WIPI4-ATG2/AMPK-ULK1 complex and translocates to nascent autophagosomes where it controls their size. WIPI4 also interacts with the AMPK-related kinases NUAK2 and BRSK2 as upstream regulators.","method":"Co-immunoprecipitation, WIPI interactome analysis, functional kinase screen, translocation imaging","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP and functional kinase screen in a single lab; multiple orthogonal methods but not independently replicated","pmids":["28561066"],"is_preprint":false},{"year":2021,"finding":"WDR45 and WDR45B are specifically required for autophagosome maturation into autolysosomes in neural cells. They interact with the tether protein EPG5 and target it to late endosomes/lysosomes to promote autophagosome-lysosome fusion; loss of WDR45/45B dampens formation of the SNARE-EPG5 fusion machinery. BPAN-associated WDR45 mutations fail to rescue these defects due to impaired EPG5 binding.","method":"Double knockout (DKO) mouse neural cells, Co-IP, rescue experiments with BPAN mutants, fluorescence imaging of autophagosome maturation, SNARE complex assays","journal":"Current biology : CB","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO with defined cellular phenotype, reciprocal Co-IP, mutant rescue experiments, multiple orthogonal readouts in one study","pmids":["33636118","34105435"],"is_preprint":false},{"year":2021,"finding":"WDR45 deficiency impairs ferritinophagy (autophagic degradation of ferritin) via reduced NCOA4 levels, leading to accumulation of ferric iron-containing ferritin and iron overload. AAV-mediated restoration of WDR45 rescued NCOA4 and ferritin levels in patient-derived cells.","method":"CRISPR-Cas9 WDR45 knockout neuroblastoma cells, immunoblotting, AAV rescue, iron measurement assays","journal":"Journal of neurochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO with defined iron phenotype and genetic rescue, single lab, two orthogonal methods","pmids":["34837396","36751498"],"is_preprint":false},{"year":2024,"finding":"WIPI4 (WDR45) depletion causes ferroptosis via an autophagy-independent mechanism: WIPI4 depletion increases ATG2A localization at ER-mitochondrial contact sites, enhancing phosphatidylserine import into mitochondria, which increases mitochondrial synthesis of phosphatidylethanolamine (a lipid prone to peroxidation), thereby enabling lipid peroxidation-driven ferroptosis. This was demonstrated in cell culture and in zebrafish.","method":"siRNA/shRNA knockdown in cell culture, zebrafish loss-of-function model, lipidomics, subcellular fractionation, live imaging of ER-mitochondria contact sites","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — mechanistic pathway established in two independent model systems (cell culture and zebrafish) with lipid profiling and localization data; rigorous single study with multiple orthogonal methods","pmids":["38454050"],"is_preprint":false},{"year":2021,"finding":"Loss of WDR45 leads to accumulation of ER proteins, elevated ER stress, and activation of the unfolded protein response (UPR) via ERN1/IRE1 and EIF2AK3/PERK pathways, ultimately causing neuronal apoptosis. Suppression of ER stress or mTOR inhibition (activating autophagy) alleviated cell death in wdr45 KO mouse neurons.","method":"Constitutive wdr45 KO mice, quantitative proteomics, ER stress pathway immunoblotting, pharmacological rescue (TUDCA, rapamycin), TUNEL apoptosis assay","journal":"Autophagy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO mouse model with proteomic and pathway analysis, pharmacological rescue, single lab","pmids":["31204559"],"is_preprint":false},{"year":2013,"finding":"WDR45 (WIPI4) is required for normal autophagic flux: lymphoblastoid cells from patients with loss-of-function WDR45 mutations show severely impaired autophagic activity and accumulation of aberrant early autophagic structures, establishing WDR45 as functionally required for autophagy in human cells.","method":"Lymphoblastoid cell lines from patients, autophagy flux assays, protein expression analysis, aberrant autophagosome morphology by microscopy","journal":"Nature genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — human patient-derived cells with functional autophagy readouts, single lab, confirmed in multiple patient lines","pmids":["23435086"],"is_preprint":false},{"year":2015,"finding":"CNS-specific Wdr45 knockout mice exhibit defective autophagic flux, SQSTM1/p62- and ubiquitin-positive protein aggregate accumulation in neurons and axons, poor motor coordination, impaired learning and memory, and extensive axon swelling with axon spheroids, establishing WDR45 as required for basal neuronal autophagy and axonal homeostasis in vivo.","method":"CNS-specific conditional Wdr45 knockout mouse (Nes-Wdr45fl/Y), behavioral testing, immunohistochemistry, autophagic flux assays","journal":"Autophagy","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean tissue-specific KO with defined behavioral and cellular phenotypes, multiple readouts, replicated in subsequent KO models (PMIDs: 31204559, 34043061)","pmids":["26000824"],"is_preprint":false},{"year":2018,"finding":"Loss of WDR45 function in patient-derived fibroblasts and iPSC-derived midbrain neurons increases cellular iron levels and oxidative stress, accompanied by mitochondrial abnormalities and diminished lysosomal function. Restoring WDR45 levels partially rescued oxidative stress and susceptibility to iron treatment; autophagy activation reduced iron overload, indicating WDR45 is required for lysosomal degradation of iron-containing organelles.","method":"Patient-specific WDR45 mutant fibroblasts, iPSC-derived midbrain neurons, WDR45 overexpression rescue, iron assays, mitochondrial function assays, lysosomal activity assays","journal":"Brain : a journal of neurology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — two patient-derived cell models with genetic rescue, single lab, multiple readouts","pmids":["30169597"],"is_preprint":false},{"year":2021,"finding":"WDR45 mutation impairs autophagic degradation of transferrin receptor (TfRC), causing TfRC accumulation and increased intracellular iron. Simultaneously, ferritin H (FTH) is decreased, leading to elevated ferrous iron (Fe2+), lipid peroxidation, ROS production, decreased GPX4, and ferroptotic cell death.","method":"WDR45 mutant overexpression in cell lines, chloroquine/ATG2A knockdown for autophagy inhibition, iron measurement, lipid peroxidation assay, ROS measurement, GPX4 western blot, cell viability assay","journal":"Frontiers in molecular biosciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple biochemical readouts in cell models, single lab, pharmacological and genetic tools used orthogonally","pmids":["34012978"],"is_preprint":false},{"year":2021,"finding":"A conserved ATG2 binding site in WIPI4 (WDR45) is disrupted by BPAN-causing mutations. Two WIPI4 residues involved in ATG2 binding are mutated in BPAN patients, and the severity of disease correlates with the degree of inhibition of ATG2 binding, establishing the WIPI4-ATG2 interaction as mechanistically critical for BPAN pathogenesis.","method":"Yeast two-hybrid, Co-IP, colocalization imaging in yeast, BPAN mutant binding assays, Hsv2/Atg2 functional analysis","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal binding assays with disease mutations, yeast ortholog functional validation, genotype-severity correlation, single lab","pmids":["34368840"],"is_preprint":false},{"year":2023,"finding":"WDR45 mutation activates chaperone-mediated autophagy (CMA) through ER stress/p38 signaling, promoting CMA-dependent degradation of ferritin heavy chain (FTH), thereby reducing FTH levels and increasing Fe2+ content. Inhibition of the ER stress/p38 pathway reduced CMA activity, elevated FTH, and decreased Fe2+ levels.","method":"HeLa cell overexpression of mutant WDR45, ER stress induction, p38 inhibitor, CMA activity assays, FTH immunoblotting, Fe2+ measurement","journal":"Free radical biology & medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological pathway dissection with multiple readouts, single lab, consistent mechanistic chain","pmids":["36940732"],"is_preprint":false},{"year":2023,"finding":"WDR45 deficiency causes axonal degeneration in midbrain dopaminergic neurons characterized by fragmented tubular ER accumulation. Proteomic and lipidomic analyses identified upregulation of Lpcat1 (lysophosphatidylcholine acyltransferase 1) and dysregulation of PC/LPC metabolism; knockdown of Lpcat1 in primary WDR45-deficient dopaminergic neurons ameliorated axonal degeneration.","method":"Conditional Wdr45 KO in midbrain DAergic neurons (WDR45cKO mice), transmission electron microscopy, proteomic analysis, lipidomic analysis, Lpcat1 knockdown in primary neurons","journal":"Molecular neurodegeneration","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO mouse with proteomic/lipidomic analyses and genetic rescue (Lpcat1 KD) in primary neurons, single lab","pmids":["39183331"],"is_preprint":false},{"year":2021,"finding":"Wdr45 knockout mice show decreased mitochondrial complex I (CI) activity in the brain, suggesting that mitochondrial dysfunction accompanies Wdr45 deficiency.","method":"Whole-body Wdr45 KO mouse (TALEN-generated), biochemical measurement of respiratory chain complex activity in brain tissue","journal":"Mammalian genome : official journal of the International Mammalian Genome Society","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean KO mouse with direct enzymatic assay, single lab, limited mechanistic follow-up","pmids":["34043061"],"is_preprint":false},{"year":2021,"finding":"Knockdown of Wdr45 during mouse brain development (via in utero electroporation) causes abnormal dendritic development and synaptogenesis during corticogenesis, and less-developed terminal arbors of callosal axons, phenotypes rescued by RNAi-resistant Wdr45. Wdr45 protein localizes to excitatory synapses as determined by biochemical fractionation.","method":"In utero electroporation knockdown in mice, dendritic morphology analysis, biochemical fractionation of synaptosomes, RNAi rescue experiment","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — acute KD with genetic rescue and subcellular fractionation localization, single lab","pmids":["34799629"],"is_preprint":false},{"year":2025,"finding":"Cryo-EM structures of the ATG2A-WDR45/WIPI4 and ATG2A-WDR45/WIPI4-ATG9A complexes were resolved, revealing the architecture for lipid transfer and re-equilibration during phagophore membrane expansion. Molecular dynamics simulations elucidated the mechanism by which ATG2A extracts lipids from donor membranes within this tripartite complex.","method":"Cryo-electron microscopy (cryo-EM) structure determination, molecular dynamics simulations","journal":"Autophagy","confidence":"High","confidence_rationale":"Tier 1 / Moderate — cryo-EM structure with molecular dynamics, single lab but high-resolution structural evidence","pmids":["40116844"],"is_preprint":false},{"year":2024,"finding":"WDR45 deficiency impairs chaperone-mediated autophagy (CMA), leading to accumulation of fatty acid synthase (Fasn) and subsequent lipid droplet (LD) accumulation in Wdr45 KO cells. Fasn is a CMA substrate (co-immunoprecipitated with HSC70), and defective CMA elevates Fasn levels, promoting LD formation.","method":"CRISPR-Cas9 Wdr45 KO SN4741 cells, Co-IP of Fasn with HSC70, lysosomal inhibitor/CMA activator treatments, BODIPY lipid droplet staining, western blotting","journal":"Lipids in health and disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP identifying substrate-chaperone interaction plus KO phenotype, single lab, two orthogonal methods","pmids":["38539242"],"is_preprint":false},{"year":2025,"finding":"WDR45 forms gel-like condensates via its WD5 domain and undergoes phase separation with Caprin-1 to regulate stress granule (SG) disassembly. WDR45 competitively displaces G3BP1 from Caprin-1 to promote SG disassembly. BPAN-associated WDR45 mutations impair condensate formation and Caprin-1 interaction, resulting in delayed SG disassembly. In iPSC-derived midbrain neurons from a BPAN patient, SG recovery was delayed, directly linking WDR45 dysfunction to SG dysregulation.","method":"Phase separation assays, Co-IP, competitive binding assays, iPSC-derived midbrain neurons from BPAN patient, stress granule imaging and recovery assays, domain mapping (WD5)","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple biochemical methods (Co-IP, phase separation) plus patient iPSC-derived neuronal model, single lab","pmids":["40473629"],"is_preprint":false},{"year":2021,"finding":"In a Dictyostelium discoideum model, the WDR45 homolog Wdr45l is required for autophagy; its loss phenocopies Vmp1 (ER omegasome protein) deficiency with impaired autophagy, local PtdIns3P enrichment, and chronic ER stress activation. Additional mutation of Atg1 (upstream autophagy regulator) in Wdr45l mutants prevented aberrant PtdIns3P localization and rescued axenic growth, positioning Wdr45l downstream of Atg1 in the PtdIns3P pathway.","method":"CRISPR-generated Dictyostelium KO strains, PtdIns3P lipid reporter imaging, genetic epistasis (Atg1 double mutant), ER stress assays, growth assays","journal":"Autophagy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis in a model organism with lipid reporter imaging, single lab, ortholog confirmed by domain/function consistency","pmids":["34328055"],"is_preprint":false},{"year":2024,"finding":"WIPI4 (WDR45) depletion causes defective autophagy and aberrant autophagosome formation in iPSC-derived midbrain dopaminergic neurons from BPAN patients. A screen of FDA-approved drugs identified cardiac glycosides as correcting disease-related defective autophagosome formation and restoring BPAN-specific gene expression profiles, demonstrating the autophagy defect is pharmacologically tractable.","method":"iPSC-derived midbrain dopaminergic neuronal model (patient and isogenic lines), high-content imaging-based drug screen, gene expression profiling","journal":"bioRxiv : the preprint server for biology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — preprint, single lab, medium-throughput screen without deep mechanistic follow-up of WDR45 mechanism per se","pmids":["37745522"],"is_preprint":true},{"year":2025,"finding":"In a Drosophila dwdr45 KO model, induction of autophagy improved shortened lifespan and seizure-like behavior but did not restore locomotor function, establishing by genetic epistasis that autophagy deficiency accounts for some but not all phenotypes caused by WDR45 loss.","method":"CRISPR/Cas9 dwdr45 KO Drosophila, pharmacological autophagy induction, behavioral phenotyping (locomotion, seizure, lifespan)","journal":"bioRxiv","confidence":"Low","confidence_rationale":"Tier 2 / Weak — genetic epistasis in Drosophila ortholog model, preprint, single lab","pmids":["bio_10.1101_2025.02.06.636873"],"is_preprint":true}],"current_model":"WDR45 (WIPI4) is a PI3P-binding WD40 β-propeller protein that functions at multiple steps of autophagy: it forms a rod-shaped complex with ATG2A (structurally resolved by cryo-EM) that tethers PI3P-containing membranes to PI3P-free membranes to drive lipid transfer and phagophore expansion; it scaffolds LKB1-AMPK-ULK1 signaling upstream of autophagosome formation; it interacts with EPG5 to promote autophagosome-lysosome fusion in neural cells; it is required for ferritinophagy (via NCOA4) and CMA-dependent degradation of ferritin and Fasn; its loss causes ER stress, mitochondrial phosphatidylethanolamine accumulation leading to autophagy-independent ferroptosis, and dysregulated stress granule disassembly via impaired phase separation with Caprin-1—collectively explaining how WDR45 mutations cause iron accumulation and neurodegeneration in BPAN."},"narrative":{"mechanistic_narrative":"WDR45 (WIPI4) is a PI3P-binding WD40 β-propeller protein required for autophagy in human cells, where loss-of-function mutations impair autophagic flux and cause accumulation of aberrant early autophagic structures [PMID:23435086]. Its central biochemical role is to form a rod-shaped complex with ATG2A in which WIPI4 binds one tip of the ATG2A rod, allowing the complex to tether PI3P-containing membranes to PI3P-free membranes and drive lipid transfer during phagophore expansion [PMID:30185561, PMID:30766969]; cryo-EM of the ATG2A–WDR45 and ATG2A–WDR45–ATG9A assemblies resolved the architecture underlying this lipid extraction and re-equilibration [PMID:40116844]. Beyond membrane tethering, WIPI4 scaffolds LKB1–AMPK–ULK1 signaling, being released from a WIPI4–ATG2/AMPK–ULK1 complex upon AMPK activation to translocate to nascent autophagosomes and control their size [PMID:28561066], and it acts together with WDR45B to target the tether EPG5 to late endosomes/lysosomes, promoting SNARE-dependent autophagosome–lysosome fusion in neural cells [PMID:33636118, PMID:34105435]. WDR45 is required for basal neuronal autophagy and axonal homeostasis in vivo: CNS-specific knockout mice accumulate p62/ubiquitin-positive aggregates, develop axon spheroids, and show motor and cognitive deficits [PMID:26000824]. WDR45 also governs iron handling through autophagy, being required for ferritinophagy via NCOA4 and for autophagic degradation of the transferrin receptor; its deficiency drives ferritin/iron imbalance, lipid peroxidation, and ferroptotic cell death [PMID:34837396, PMID:36751498, PMID:34012978]. Independent of canonical autophagy, WIPI4 depletion redistributes ATG2A to ER–mitochondria contacts, increasing phosphatidylserine import and mitochondrial phosphatidylethanolamine synthesis to enable ferroptosis [PMID:38454050], and WDR45 loss elicits ER stress with UPR-driven neuronal apoptosis [PMID:31204559]. The BPAN-causing mutations disrupt a conserved ATG2-binding site, with disease severity tracking the degree of lost ATG2 binding, establishing the WIPI4–ATG2 interaction as mechanistically central to disease [PMID:34368840].","teleology":[{"year":2013,"claim":"Established that WDR45 is functionally required for autophagy in humans, converting a disease-gene association into a defined cellular defect.","evidence":"Autophagy flux assays and morphology in patient lymphoblastoid cells carrying loss-of-function mutations","pmids":["23435086"],"confidence":"Medium","gaps":["Did not define the biochemical step WDR45 acts at","No molecular partner identified"]},{"year":2015,"claim":"Showed WDR45 is required for basal neuronal autophagy and axonal homeostasis in vivo, linking its loss to the neurodegenerative phenotype.","evidence":"CNS-specific conditional Wdr45 knockout mice with behavioral, histological, and flux readouts","pmids":["26000824"],"confidence":"High","gaps":["Molecular mechanism connecting autophagy loss to axon spheroids unresolved","Cell-type specificity of vulnerability not addressed"]},{"year":2017,"claim":"Placed WIPI4 within upstream autophagy-initiation signaling, defining a regulatory rather than purely structural role.","evidence":"Co-IP, WIPI interactome, kinase screen, and translocation imaging implicating LKB1-AMPK-ULK1 and NUAK2/BRSK2","pmids":["28561066"],"confidence":"Medium","gaps":["Single lab, not independently replicated","Mechanism of WIPI4 release from the complex unresolved"]},{"year":2018,"claim":"Defined WIPI4's core biochemical activity: tethering PI3P-containing to PI3P-free membranes via the ATG2A complex to support lipid transfer during phagophore expansion.","evidence":"Single-particle EM, cross-linking MS, and in vitro tethering assays of the ATG2A-WIPI4 complex","pmids":["30185561","30766969"],"confidence":"High","gaps":["High-resolution structure not yet available","Directionality and rate of lipid transfer not quantified at this stage"]},{"year":2018,"claim":"Connected WDR45 loss to iron overload and oxidative stress in disease-relevant human neurons, framing the lysosomal-iron axis of pathology.","evidence":"Patient fibroblasts and iPSC-derived midbrain neurons with overexpression rescue, iron and mitochondrial/lysosomal assays","pmids":["30169597"],"confidence":"Medium","gaps":["Molecular link between autophagy defect and iron accumulation not yet defined","Single lab"]},{"year":2021,"claim":"Identified the iron-handling mechanism: WDR45 enables ferritinophagy via NCOA4 and autophagic turnover of the transferrin receptor, whose failure drives ferroptosis.","evidence":"CRISPR knockout neuroblastoma cells and mutant-overexpression models with iron, lipid peroxidation, GPX4, and AAV rescue assays","pmids":["34837396","36751498","34012978"],"confidence":"Medium","gaps":["NCOA4 reduction mechanism not defined","Relative contribution of TfRC vs ferritinophagy unresolved"]},{"year":2021,"claim":"Extended WDR45 function to autophagosome maturation, showing it and WDR45B recruit EPG5 to drive autophagosome-lysosome fusion in neural cells.","evidence":"DKO mouse neural cells, reciprocal Co-IP, BPAN-mutant rescue, and SNARE complex assays","pmids":["33636118","34105435"],"confidence":"High","gaps":["Structural basis of WDR45-EPG5 interaction unknown","Redundancy between WDR45 and WDR45B not fully mapped"]},{"year":2021,"claim":"Linked WDR45 loss to ER stress and UPR-driven neuronal apoptosis, identifying a degradative-failure consequence amenable to pharmacological rescue.","evidence":"Constitutive Wdr45 KO mice with proteomics, IRE1/PERK immunoblotting, and TUDCA/rapamycin rescue","pmids":["31204559"],"confidence":"Medium","gaps":["Causal order between ER stress and autophagy defect unclear","Single lab"]},{"year":2021,"claim":"Mapped the BPAN disease mechanism to disruption of the WIPI4-ATG2 binding site, with severity scaling to binding loss.","evidence":"Yeast two-hybrid, Co-IP, colocalization, and BPAN-mutant binding assays with Hsv2/Atg2 functional validation","pmids":["34368840"],"confidence":"Medium","gaps":["Quantitative genotype-phenotype correlation in patients not established","Single lab"]},{"year":2021,"claim":"Documented mitochondrial respiratory and developmental/synaptic phenotypes of Wdr45 loss, broadening its physiological footprint beyond degradation.","evidence":"Whole-body KO mice (complex I assays) and in utero electroporation knockdown with synaptosome fractionation and RNAi rescue","pmids":["34043061","34799629"],"confidence":"Medium","gaps":["Mechanism linking WDR45 to complex I activity unknown","Whether synaptic role is autophagy-dependent unresolved"]},{"year":2023,"claim":"Identified WDR45-controlled lipid pathways: ER-stress/p38-driven CMA degradation of ferritin and Lpcat1-dependent PC/LPC dysregulation in degenerating axons.","evidence":"Mutant-WDR45 HeLa cells with CMA assays and conditional DAergic-neuron KO mice with proteomics/lipidomics and Lpcat1 knockdown rescue","pmids":["36940732","39183331"],"confidence":"Medium","gaps":["Integration of CMA, ferritinophagy, and lipid pathways into one model incomplete","Single lab per finding"]},{"year":2024,"claim":"Established an autophagy-independent ferroptosis mechanism, showing WIPI4 loss redistributes ATG2A to ER-mitochondria contacts to drive peroxidation-prone phosphatidylethanolamine synthesis.","evidence":"Knockdown in cells and zebrafish with lipidomics, fractionation, and live imaging of contact sites","pmids":["38454050"],"confidence":"High","gaps":["Relative contribution of autophagy-dependent vs -independent ferroptosis in BPAN unresolved"]},{"year":2024,"claim":"Added a CMA-substrate axis whereby WDR45 loss elevates Fasn and causes lipid droplet accumulation, expanding its metabolic role.","evidence":"CRISPR Wdr45 KO SN4741 cells, Fasn-HSC70 Co-IP, and BODIPY lipid droplet staining","pmids":["38539242"],"confidence":"Medium","gaps":["How WDR45 supports CMA mechanistically not defined","Single lab, two methods"]},{"year":2025,"claim":"Resolved the structural architecture of the ATG2A-WDR45 and ATG2A-WDR45-ATG9A complexes, defining the lipid-extraction mechanism at near-atomic detail.","evidence":"Cryo-EM structure determination with molecular dynamics simulations","pmids":["40116844"],"confidence":"High","gaps":["Dynamics of the full transfer cycle in vivo not captured","Regulation of complex assembly not addressed"]},{"year":2025,"claim":"Uncovered a non-degradative function: WDR45 phase-separates with Caprin-1 via its WD5 domain to promote stress-granule disassembly, displacing G3BP1.","evidence":"Phase separation and competitive binding assays plus BPAN patient iPSC-derived neurons with SG recovery imaging","pmids":["40473629"],"confidence":"Medium","gaps":["In vivo relevance of SG dysregulation to neurodegeneration not established","Single lab"]},{"year":null,"claim":"How WDR45's multiple roles—membrane tethering, fusion, signaling scaffolding, iron/lipid metabolism, and stress-granule regulation—are integrated into a unified mechanism driving BPAN neurodegeneration remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No model reconciling autophagy-dependent and -independent pathologies","Hierarchy among iron, ER stress, and lipid phenotypes undefined","Therapeutic mechanism of candidate compounds not validated beyond preprint"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[0,4,15]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,2,15]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[0]}],"localization":[{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[4,5,12]},{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[2]},{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[4]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[14]}],"pathway":[{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[0,6,7,2]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[4,9,5]},{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[3,12,16]},{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[17]}],"complexes":["ATG2A-WDR45 (WIPI4) lipid-transfer complex","ATG2A-WDR45-ATG9A complex","WIPI4-ATG2/AMPK-ULK1 signaling complex"],"partners":["ATG2A","EPG5","WDR45B","NCOA4","CAPRIN-1","AMPK","ULK1","ATG9A"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9Y484","full_name":"WD repeat domain phosphoinositide-interacting protein 4","aliases":["WD repeat-containing protein 45"],"length_aa":360,"mass_kda":39.9,"function":"Component of the autophagy machinery that controls the major intracellular degradation process by which cytoplasmic materials are packaged into autophagosomes and delivered to lysosomes for degradation (PubMed:23435086, PubMed:28561066). Binds phosphatidylinositol 3-phosphate (PtdIns3P) (PubMed:28561066). Activated by the STK11/AMPK signaling pathway upon starvation, WDR45 is involved in autophagosome assembly downstream of WIPI2, regulating the size of forming autophagosomes (PubMed:28561066). Together with WIPI1, promotes ATG2 (ATG2A or ATG2B)-mediated lipid transfer by enhancing ATG2-association with phosphatidylinositol 3-monophosphate (PI3P)-containing membranes (PubMed:31271352). Probably recruited to membranes through its PtdIns3P activity (PubMed:28561066)","subcellular_location":"Preautophagosomal structure; Cytoplasm","url":"https://www.uniprot.org/uniprotkb/Q9Y484/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/WDR45","classification":"Not Classified","n_dependent_lines":21,"n_total_lines":1208,"dependency_fraction":0.0173841059602649},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"ATG2B","stoichiometry":10.0}],"url":"https://opencell.sf.czbiohub.org/search/WDR45","total_profiled":1310},"omim":[{"mim_id":"300894","title":"NEURODEGENERATION WITH BRAIN IRON ACCUMULATION 5; NBIA5","url":"https://www.omim.org/entry/300894"},{"mim_id":"300526","title":"WD REPEAT-CONTAINING PROTEIN 45; WDR45","url":"https://www.omim.org/entry/300526"},{"mim_id":"234200","title":"NEURODEGENERATION WITH BRAIN IRON 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ATG2A can bridge neighboring vesicles through interactions at each tip; WIPI4 binds to one tip, enabling the ATG2A-WIPI4 complex to specifically tether PI3P-containing vesicles to PI3P-free vesicles, suggesting a role in ER-phagophore association and lipid membrane transfer during phagophore expansion.\",\n      \"method\": \"Single-particle electron microscopy, chemical cross-linking coupled with mass spectrometry, biochemical tethering assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — structural EM plus cross-linking MS plus biochemical reconstitution of tethering activity in a single study; independently supported by a companion paper (PMID:30766969)\",\n      \"pmids\": [\"30185561\", \"30766969\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"WIPI4 (WDR45) scaffolds LKB1-AMPK-ULK1 signaling for autophagy control: in response to LKB1-mediated AMPK stimulation, WIPI4 is released from a WIPI4-ATG2/AMPK-ULK1 complex and translocates to nascent autophagosomes where it controls their size. WIPI4 also interacts with the AMPK-related kinases NUAK2 and BRSK2 as upstream regulators.\",\n      \"method\": \"Co-immunoprecipitation, WIPI interactome analysis, functional kinase screen, translocation imaging\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP and functional kinase screen in a single lab; multiple orthogonal methods but not independently replicated\",\n      \"pmids\": [\"28561066\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"WDR45 and WDR45B are specifically required for autophagosome maturation into autolysosomes in neural cells. They interact with the tether protein EPG5 and target it to late endosomes/lysosomes to promote autophagosome-lysosome fusion; loss of WDR45/45B dampens formation of the SNARE-EPG5 fusion machinery. BPAN-associated WDR45 mutations fail to rescue these defects due to impaired EPG5 binding.\",\n      \"method\": \"Double knockout (DKO) mouse neural cells, Co-IP, rescue experiments with BPAN mutants, fluorescence imaging of autophagosome maturation, SNARE complex assays\",\n      \"journal\": \"Current biology : CB\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO with defined cellular phenotype, reciprocal Co-IP, mutant rescue experiments, multiple orthogonal readouts in one study\",\n      \"pmids\": [\"33636118\", \"34105435\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"WDR45 deficiency impairs ferritinophagy (autophagic degradation of ferritin) via reduced NCOA4 levels, leading to accumulation of ferric iron-containing ferritin and iron overload. AAV-mediated restoration of WDR45 rescued NCOA4 and ferritin levels in patient-derived cells.\",\n      \"method\": \"CRISPR-Cas9 WDR45 knockout neuroblastoma cells, immunoblotting, AAV rescue, iron measurement assays\",\n      \"journal\": \"Journal of neurochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO with defined iron phenotype and genetic rescue, single lab, two orthogonal methods\",\n      \"pmids\": [\"34837396\", \"36751498\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"WIPI4 (WDR45) depletion causes ferroptosis via an autophagy-independent mechanism: WIPI4 depletion increases ATG2A localization at ER-mitochondrial contact sites, enhancing phosphatidylserine import into mitochondria, which increases mitochondrial synthesis of phosphatidylethanolamine (a lipid prone to peroxidation), thereby enabling lipid peroxidation-driven ferroptosis. This was demonstrated in cell culture and in zebrafish.\",\n      \"method\": \"siRNA/shRNA knockdown in cell culture, zebrafish loss-of-function model, lipidomics, subcellular fractionation, live imaging of ER-mitochondria contact sites\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — mechanistic pathway established in two independent model systems (cell culture and zebrafish) with lipid profiling and localization data; rigorous single study with multiple orthogonal methods\",\n      \"pmids\": [\"38454050\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Loss of WDR45 leads to accumulation of ER proteins, elevated ER stress, and activation of the unfolded protein response (UPR) via ERN1/IRE1 and EIF2AK3/PERK pathways, ultimately causing neuronal apoptosis. Suppression of ER stress or mTOR inhibition (activating autophagy) alleviated cell death in wdr45 KO mouse neurons.\",\n      \"method\": \"Constitutive wdr45 KO mice, quantitative proteomics, ER stress pathway immunoblotting, pharmacological rescue (TUDCA, rapamycin), TUNEL apoptosis assay\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO mouse model with proteomic and pathway analysis, pharmacological rescue, single lab\",\n      \"pmids\": [\"31204559\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"WDR45 (WIPI4) is required for normal autophagic flux: lymphoblastoid cells from patients with loss-of-function WDR45 mutations show severely impaired autophagic activity and accumulation of aberrant early autophagic structures, establishing WDR45 as functionally required for autophagy in human cells.\",\n      \"method\": \"Lymphoblastoid cell lines from patients, autophagy flux assays, protein expression analysis, aberrant autophagosome morphology by microscopy\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — human patient-derived cells with functional autophagy readouts, single lab, confirmed in multiple patient lines\",\n      \"pmids\": [\"23435086\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"CNS-specific Wdr45 knockout mice exhibit defective autophagic flux, SQSTM1/p62- and ubiquitin-positive protein aggregate accumulation in neurons and axons, poor motor coordination, impaired learning and memory, and extensive axon swelling with axon spheroids, establishing WDR45 as required for basal neuronal autophagy and axonal homeostasis in vivo.\",\n      \"method\": \"CNS-specific conditional Wdr45 knockout mouse (Nes-Wdr45fl/Y), behavioral testing, immunohistochemistry, autophagic flux assays\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean tissue-specific KO with defined behavioral and cellular phenotypes, multiple readouts, replicated in subsequent KO models (PMIDs: 31204559, 34043061)\",\n      \"pmids\": [\"26000824\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Loss of WDR45 function in patient-derived fibroblasts and iPSC-derived midbrain neurons increases cellular iron levels and oxidative stress, accompanied by mitochondrial abnormalities and diminished lysosomal function. Restoring WDR45 levels partially rescued oxidative stress and susceptibility to iron treatment; autophagy activation reduced iron overload, indicating WDR45 is required for lysosomal degradation of iron-containing organelles.\",\n      \"method\": \"Patient-specific WDR45 mutant fibroblasts, iPSC-derived midbrain neurons, WDR45 overexpression rescue, iron assays, mitochondrial function assays, lysosomal activity assays\",\n      \"journal\": \"Brain : a journal of neurology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — two patient-derived cell models with genetic rescue, single lab, multiple readouts\",\n      \"pmids\": [\"30169597\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"WDR45 mutation impairs autophagic degradation of transferrin receptor (TfRC), causing TfRC accumulation and increased intracellular iron. Simultaneously, ferritin H (FTH) is decreased, leading to elevated ferrous iron (Fe2+), lipid peroxidation, ROS production, decreased GPX4, and ferroptotic cell death.\",\n      \"method\": \"WDR45 mutant overexpression in cell lines, chloroquine/ATG2A knockdown for autophagy inhibition, iron measurement, lipid peroxidation assay, ROS measurement, GPX4 western blot, cell viability assay\",\n      \"journal\": \"Frontiers in molecular biosciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple biochemical readouts in cell models, single lab, pharmacological and genetic tools used orthogonally\",\n      \"pmids\": [\"34012978\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"A conserved ATG2 binding site in WIPI4 (WDR45) is disrupted by BPAN-causing mutations. Two WIPI4 residues involved in ATG2 binding are mutated in BPAN patients, and the severity of disease correlates with the degree of inhibition of ATG2 binding, establishing the WIPI4-ATG2 interaction as mechanistically critical for BPAN pathogenesis.\",\n      \"method\": \"Yeast two-hybrid, Co-IP, colocalization imaging in yeast, BPAN mutant binding assays, Hsv2/Atg2 functional analysis\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal binding assays with disease mutations, yeast ortholog functional validation, genotype-severity correlation, single lab\",\n      \"pmids\": [\"34368840\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"WDR45 mutation activates chaperone-mediated autophagy (CMA) through ER stress/p38 signaling, promoting CMA-dependent degradation of ferritin heavy chain (FTH), thereby reducing FTH levels and increasing Fe2+ content. Inhibition of the ER stress/p38 pathway reduced CMA activity, elevated FTH, and decreased Fe2+ levels.\",\n      \"method\": \"HeLa cell overexpression of mutant WDR45, ER stress induction, p38 inhibitor, CMA activity assays, FTH immunoblotting, Fe2+ measurement\",\n      \"journal\": \"Free radical biology & medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological pathway dissection with multiple readouts, single lab, consistent mechanistic chain\",\n      \"pmids\": [\"36940732\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"WDR45 deficiency causes axonal degeneration in midbrain dopaminergic neurons characterized by fragmented tubular ER accumulation. Proteomic and lipidomic analyses identified upregulation of Lpcat1 (lysophosphatidylcholine acyltransferase 1) and dysregulation of PC/LPC metabolism; knockdown of Lpcat1 in primary WDR45-deficient dopaminergic neurons ameliorated axonal degeneration.\",\n      \"method\": \"Conditional Wdr45 KO in midbrain DAergic neurons (WDR45cKO mice), transmission electron microscopy, proteomic analysis, lipidomic analysis, Lpcat1 knockdown in primary neurons\",\n      \"journal\": \"Molecular neurodegeneration\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO mouse with proteomic/lipidomic analyses and genetic rescue (Lpcat1 KD) in primary neurons, single lab\",\n      \"pmids\": [\"39183331\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Wdr45 knockout mice show decreased mitochondrial complex I (CI) activity in the brain, suggesting that mitochondrial dysfunction accompanies Wdr45 deficiency.\",\n      \"method\": \"Whole-body Wdr45 KO mouse (TALEN-generated), biochemical measurement of respiratory chain complex activity in brain tissue\",\n      \"journal\": \"Mammalian genome : official journal of the International Mammalian Genome Society\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean KO mouse with direct enzymatic assay, single lab, limited mechanistic follow-up\",\n      \"pmids\": [\"34043061\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Knockdown of Wdr45 during mouse brain development (via in utero electroporation) causes abnormal dendritic development and synaptogenesis during corticogenesis, and less-developed terminal arbors of callosal axons, phenotypes rescued by RNAi-resistant Wdr45. Wdr45 protein localizes to excitatory synapses as determined by biochemical fractionation.\",\n      \"method\": \"In utero electroporation knockdown in mice, dendritic morphology analysis, biochemical fractionation of synaptosomes, RNAi rescue experiment\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — acute KD with genetic rescue and subcellular fractionation localization, single lab\",\n      \"pmids\": [\"34799629\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Cryo-EM structures of the ATG2A-WDR45/WIPI4 and ATG2A-WDR45/WIPI4-ATG9A complexes were resolved, revealing the architecture for lipid transfer and re-equilibration during phagophore membrane expansion. Molecular dynamics simulations elucidated the mechanism by which ATG2A extracts lipids from donor membranes within this tripartite complex.\",\n      \"method\": \"Cryo-electron microscopy (cryo-EM) structure determination, molecular dynamics simulations\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — cryo-EM structure with molecular dynamics, single lab but high-resolution structural evidence\",\n      \"pmids\": [\"40116844\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"WDR45 deficiency impairs chaperone-mediated autophagy (CMA), leading to accumulation of fatty acid synthase (Fasn) and subsequent lipid droplet (LD) accumulation in Wdr45 KO cells. Fasn is a CMA substrate (co-immunoprecipitated with HSC70), and defective CMA elevates Fasn levels, promoting LD formation.\",\n      \"method\": \"CRISPR-Cas9 Wdr45 KO SN4741 cells, Co-IP of Fasn with HSC70, lysosomal inhibitor/CMA activator treatments, BODIPY lipid droplet staining, western blotting\",\n      \"journal\": \"Lipids in health and disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP identifying substrate-chaperone interaction plus KO phenotype, single lab, two orthogonal methods\",\n      \"pmids\": [\"38539242\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"WDR45 forms gel-like condensates via its WD5 domain and undergoes phase separation with Caprin-1 to regulate stress granule (SG) disassembly. WDR45 competitively displaces G3BP1 from Caprin-1 to promote SG disassembly. BPAN-associated WDR45 mutations impair condensate formation and Caprin-1 interaction, resulting in delayed SG disassembly. In iPSC-derived midbrain neurons from a BPAN patient, SG recovery was delayed, directly linking WDR45 dysfunction to SG dysregulation.\",\n      \"method\": \"Phase separation assays, Co-IP, competitive binding assays, iPSC-derived midbrain neurons from BPAN patient, stress granule imaging and recovery assays, domain mapping (WD5)\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple biochemical methods (Co-IP, phase separation) plus patient iPSC-derived neuronal model, single lab\",\n      \"pmids\": [\"40473629\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"In a Dictyostelium discoideum model, the WDR45 homolog Wdr45l is required for autophagy; its loss phenocopies Vmp1 (ER omegasome protein) deficiency with impaired autophagy, local PtdIns3P enrichment, and chronic ER stress activation. Additional mutation of Atg1 (upstream autophagy regulator) in Wdr45l mutants prevented aberrant PtdIns3P localization and rescued axenic growth, positioning Wdr45l downstream of Atg1 in the PtdIns3P pathway.\",\n      \"method\": \"CRISPR-generated Dictyostelium KO strains, PtdIns3P lipid reporter imaging, genetic epistasis (Atg1 double mutant), ER stress assays, growth assays\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis in a model organism with lipid reporter imaging, single lab, ortholog confirmed by domain/function consistency\",\n      \"pmids\": [\"34328055\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"WIPI4 (WDR45) depletion causes defective autophagy and aberrant autophagosome formation in iPSC-derived midbrain dopaminergic neurons from BPAN patients. A screen of FDA-approved drugs identified cardiac glycosides as correcting disease-related defective autophagosome formation and restoring BPAN-specific gene expression profiles, demonstrating the autophagy defect is pharmacologically tractable.\",\n      \"method\": \"iPSC-derived midbrain dopaminergic neuronal model (patient and isogenic lines), high-content imaging-based drug screen, gene expression profiling\",\n      \"journal\": \"bioRxiv : the preprint server for biology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — preprint, single lab, medium-throughput screen without deep mechanistic follow-up of WDR45 mechanism per se\",\n      \"pmids\": [\"37745522\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"In a Drosophila dwdr45 KO model, induction of autophagy improved shortened lifespan and seizure-like behavior but did not restore locomotor function, establishing by genetic epistasis that autophagy deficiency accounts for some but not all phenotypes caused by WDR45 loss.\",\n      \"method\": \"CRISPR/Cas9 dwdr45 KO Drosophila, pharmacological autophagy induction, behavioral phenotyping (locomotion, seizure, lifespan)\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 2 / Weak — genetic epistasis in Drosophila ortholog model, preprint, single lab\",\n      \"pmids\": [\"bio_10.1101_2025.02.06.636873\"],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"WDR45 (WIPI4) is a PI3P-binding WD40 β-propeller protein that functions at multiple steps of autophagy: it forms a rod-shaped complex with ATG2A (structurally resolved by cryo-EM) that tethers PI3P-containing membranes to PI3P-free membranes to drive lipid transfer and phagophore expansion; it scaffolds LKB1-AMPK-ULK1 signaling upstream of autophagosome formation; it interacts with EPG5 to promote autophagosome-lysosome fusion in neural cells; it is required for ferritinophagy (via NCOA4) and CMA-dependent degradation of ferritin and Fasn; its loss causes ER stress, mitochondrial phosphatidylethanolamine accumulation leading to autophagy-independent ferroptosis, and dysregulated stress granule disassembly via impaired phase separation with Caprin-1—collectively explaining how WDR45 mutations cause iron accumulation and neurodegeneration in BPAN.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"WDR45 (WIPI4) is a PI3P-binding WD40 β-propeller protein required for autophagy in human cells, where loss-of-function mutations impair autophagic flux and cause accumulation of aberrant early autophagic structures [#6]. Its central biochemical role is to form a rod-shaped complex with ATG2A in which WIPI4 binds one tip of the ATG2A rod, allowing the complex to tether PI3P-containing membranes to PI3P-free membranes and drive lipid transfer during phagophore expansion [#0]; cryo-EM of the ATG2A–WDR45 and ATG2A–WDR45–ATG9A assemblies resolved the architecture underlying this lipid extraction and re-equilibration [#15]. Beyond membrane tethering, WIPI4 scaffolds LKB1–AMPK–ULK1 signaling, being released from a WIPI4–ATG2/AMPK–ULK1 complex upon AMPK activation to translocate to nascent autophagosomes and control their size [#1], and it acts together with WDR45B to target the tether EPG5 to late endosomes/lysosomes, promoting SNARE-dependent autophagosome–lysosome fusion in neural cells [#2]. WDR45 is required for basal neuronal autophagy and axonal homeostasis in vivo: CNS-specific knockout mice accumulate p62/ubiquitin-positive aggregates, develop axon spheroids, and show motor and cognitive deficits [#7]. WDR45 also governs iron handling through autophagy, being required for ferritinophagy via NCOA4 and for autophagic degradation of the transferrin receptor; its deficiency drives ferritin/iron imbalance, lipid peroxidation, and ferroptotic cell death [#3, #9]. Independent of canonical autophagy, WIPI4 depletion redistributes ATG2A to ER–mitochondria contacts, increasing phosphatidylserine import and mitochondrial phosphatidylethanolamine synthesis to enable ferroptosis [#4], and WDR45 loss elicits ER stress with UPR-driven neuronal apoptosis [#5]. The BPAN-causing mutations disrupt a conserved ATG2-binding site, with disease severity tracking the degree of lost ATG2 binding, establishing the WIPI4–ATG2 interaction as mechanistically central to disease [#10].\",\n  \"teleology\": [\n    {\n      \"year\": 2013,\n      \"claim\": \"Established that WDR45 is functionally required for autophagy in humans, converting a disease-gene association into a defined cellular defect.\",\n      \"evidence\": \"Autophagy flux assays and morphology in patient lymphoblastoid cells carrying loss-of-function mutations\",\n      \"pmids\": [\"23435086\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not define the biochemical step WDR45 acts at\", \"No molecular partner identified\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Showed WDR45 is required for basal neuronal autophagy and axonal homeostasis in vivo, linking its loss to the neurodegenerative phenotype.\",\n      \"evidence\": \"CNS-specific conditional Wdr45 knockout mice with behavioral, histological, and flux readouts\",\n      \"pmids\": [\"26000824\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism connecting autophagy loss to axon spheroids unresolved\", \"Cell-type specificity of vulnerability not addressed\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Placed WIPI4 within upstream autophagy-initiation signaling, defining a regulatory rather than purely structural role.\",\n      \"evidence\": \"Co-IP, WIPI interactome, kinase screen, and translocation imaging implicating LKB1-AMPK-ULK1 and NUAK2/BRSK2\",\n      \"pmids\": [\"28561066\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab, not independently replicated\", \"Mechanism of WIPI4 release from the complex unresolved\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Defined WIPI4's core biochemical activity: tethering PI3P-containing to PI3P-free membranes via the ATG2A complex to support lipid transfer during phagophore expansion.\",\n      \"evidence\": \"Single-particle EM, cross-linking MS, and in vitro tethering assays of the ATG2A-WIPI4 complex\",\n      \"pmids\": [\"30185561\", \"30766969\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"High-resolution structure not yet available\", \"Directionality and rate of lipid transfer not quantified at this stage\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Connected WDR45 loss to iron overload and oxidative stress in disease-relevant human neurons, framing the lysosomal-iron axis of pathology.\",\n      \"evidence\": \"Patient fibroblasts and iPSC-derived midbrain neurons with overexpression rescue, iron and mitochondrial/lysosomal assays\",\n      \"pmids\": [\"30169597\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular link between autophagy defect and iron accumulation not yet defined\", \"Single lab\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Identified the iron-handling mechanism: WDR45 enables ferritinophagy via NCOA4 and autophagic turnover of the transferrin receptor, whose failure drives ferroptosis.\",\n      \"evidence\": \"CRISPR knockout neuroblastoma cells and mutant-overexpression models with iron, lipid peroxidation, GPX4, and AAV rescue assays\",\n      \"pmids\": [\"34837396\", \"36751498\", \"34012978\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"NCOA4 reduction mechanism not defined\", \"Relative contribution of TfRC vs ferritinophagy unresolved\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Extended WDR45 function to autophagosome maturation, showing it and WDR45B recruit EPG5 to drive autophagosome-lysosome fusion in neural cells.\",\n      \"evidence\": \"DKO mouse neural cells, reciprocal Co-IP, BPAN-mutant rescue, and SNARE complex assays\",\n      \"pmids\": [\"33636118\", \"34105435\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of WDR45-EPG5 interaction unknown\", \"Redundancy between WDR45 and WDR45B not fully mapped\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Linked WDR45 loss to ER stress and UPR-driven neuronal apoptosis, identifying a degradative-failure consequence amenable to pharmacological rescue.\",\n      \"evidence\": \"Constitutive Wdr45 KO mice with proteomics, IRE1/PERK immunoblotting, and TUDCA/rapamycin rescue\",\n      \"pmids\": [\"31204559\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Causal order between ER stress and autophagy defect unclear\", \"Single lab\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Mapped the BPAN disease mechanism to disruption of the WIPI4-ATG2 binding site, with severity scaling to binding loss.\",\n      \"evidence\": \"Yeast two-hybrid, Co-IP, colocalization, and BPAN-mutant binding assays with Hsv2/Atg2 functional validation\",\n      \"pmids\": [\"34368840\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Quantitative genotype-phenotype correlation in patients not established\", \"Single lab\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Documented mitochondrial respiratory and developmental/synaptic phenotypes of Wdr45 loss, broadening its physiological footprint beyond degradation.\",\n      \"evidence\": \"Whole-body KO mice (complex I assays) and in utero electroporation knockdown with synaptosome fractionation and RNAi rescue\",\n      \"pmids\": [\"34043061\", \"34799629\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism linking WDR45 to complex I activity unknown\", \"Whether synaptic role is autophagy-dependent unresolved\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Identified WDR45-controlled lipid pathways: ER-stress/p38-driven CMA degradation of ferritin and Lpcat1-dependent PC/LPC dysregulation in degenerating axons.\",\n      \"evidence\": \"Mutant-WDR45 HeLa cells with CMA assays and conditional DAergic-neuron KO mice with proteomics/lipidomics and Lpcat1 knockdown rescue\",\n      \"pmids\": [\"36940732\", \"39183331\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Integration of CMA, ferritinophagy, and lipid pathways into one model incomplete\", \"Single lab per finding\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Established an autophagy-independent ferroptosis mechanism, showing WIPI4 loss redistributes ATG2A to ER-mitochondria contacts to drive peroxidation-prone phosphatidylethanolamine synthesis.\",\n      \"evidence\": \"Knockdown in cells and zebrafish with lipidomics, fractionation, and live imaging of contact sites\",\n      \"pmids\": [\"38454050\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative contribution of autophagy-dependent vs -independent ferroptosis in BPAN unresolved\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Added a CMA-substrate axis whereby WDR45 loss elevates Fasn and causes lipid droplet accumulation, expanding its metabolic role.\",\n      \"evidence\": \"CRISPR Wdr45 KO SN4741 cells, Fasn-HSC70 Co-IP, and BODIPY lipid droplet staining\",\n      \"pmids\": [\"38539242\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How WDR45 supports CMA mechanistically not defined\", \"Single lab, two methods\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Resolved the structural architecture of the ATG2A-WDR45 and ATG2A-WDR45-ATG9A complexes, defining the lipid-extraction mechanism at near-atomic detail.\",\n      \"evidence\": \"Cryo-EM structure determination with molecular dynamics simulations\",\n      \"pmids\": [\"40116844\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Dynamics of the full transfer cycle in vivo not captured\", \"Regulation of complex assembly not addressed\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Uncovered a non-degradative function: WDR45 phase-separates with Caprin-1 via its WD5 domain to promote stress-granule disassembly, displacing G3BP1.\",\n      \"evidence\": \"Phase separation and competitive binding assays plus BPAN patient iPSC-derived neurons with SG recovery imaging\",\n      \"pmids\": [\"40473629\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vivo relevance of SG dysregulation to neurodegeneration not established\", \"Single lab\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How WDR45's multiple roles—membrane tethering, fusion, signaling scaffolding, iron/lipid metabolism, and stress-granule regulation—are integrated into a unified mechanism driving BPAN neurodegeneration remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No model reconciling autophagy-dependent and -independent pathologies\", \"Hierarchy among iron, ER stress, and lipid phenotypes undefined\", \"Therapeutic mechanism of candidate compounds not validated beyond preprint\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [0, 4, 15]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 2, 15]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005776\", \"supporting_discovery_ids\": []},\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [4, 5, 12]},\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [2]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [4]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [14]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [0, 6, 7, 2]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [4, 9, 5]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [3, 12, 16]},\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [17]}\n    ],\n    \"complexes\": [\n      \"ATG2A-WDR45 (WIPI4) lipid-transfer complex\",\n      \"ATG2A-WDR45-ATG9A complex\",\n      \"WIPI4-ATG2/AMPK-ULK1 signaling complex\"\n    ],\n    \"partners\": [\n      \"ATG2A\",\n      \"EPG5\",\n      \"WDR45B\",\n      \"NCOA4\",\n      \"Caprin-1\",\n      \"AMPK\",\n      \"ULK1\",\n      \"ATG9A\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}