{"gene":"WDR44","run_date":"2026-06-11T09:02:06","timeline":{"discoveries":[{"year":1999,"finding":"Rab11BP/Rabphilin-11 (WDR44) was identified as a downstream effector of Rab11 small G protein, binding preferentially to the GTP-bound (active) form of Rab11 via its N-terminal region, and was specific for Rab11 over other Rab and Rho family members. Both proteins colocalized at perinuclear regions (Golgi/recycling endosomes) and along microtubules. Overexpression of the C-terminal fragment lacking the Rab11-binding domain reduced transferrin accumulation at perinuclear regions and inhibited cell migration.","method":"GST pulldown/binding assay, co-localization by immunofluorescence, overexpression of truncation mutants with transferrin recycling assay and cell migration assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal binding assays, colocalization, functional overexpression truncation experiments replicated independently in two labs (PMIDs 10464283 and 10077598)","pmids":["10464283"],"is_preprint":false},{"year":1999,"finding":"Rab11BP (WDR44) interacts with GTP-Rab11 via an internal binding site (residues 334–504) that is normally masked by the C-terminal WD40 domain region; partial denaturation or cellular conformational change is required to expose this site. Overexpression of the truncated form rab11BP(1-504) inhibited transferrin recycling as strongly as dominant-negative Rab11, and this inhibition was rescued by co-expression of a non-prenylatable Rab11.","method":"In vitro binding assay with recombinant proteins (partial denaturation), overexpression of full-length and truncation mutants, transferrin recycling assay, epistasis by co-expression rescue","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — in vitro binding with defined domain mapping, functional transferrin recycling assay with epistasis rescue, single lab with multiple orthogonal methods","pmids":["10077598"],"is_preprint":false},{"year":2019,"finding":"Akt kinase stabilizes the Rab11a–WDR44 interaction downstream of LPA/LPAR1/PI3K signaling, preventing ciliogenesis initiation. A WDR44 phosphomimetic mutant (mimicking Akt phosphorylation) blocks ciliogenesis. WDR44 depletion promotes Rabin8 preciliary trafficking and ciliogenesis-initiating events at the mother centriole, indicating that WDR44 occupies a Rab11 effector slot that competes with the pro-ciliogenic Rab11-FIP3-Rabin8 complex.","method":"siRNA depletion of WDR44, phosphomimetic mutation, live-cell imaging of Rabin8 trafficking, co-immunoprecipitation, epistasis with LPA/Akt pathway inhibitors","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (KD, phosphomimetic mutant, Co-IP, live imaging) in a single rigorous study placing WDR44 in Akt-Rab11 signaling axis","pmids":["31204173"],"is_preprint":false},{"year":2020,"finding":"WDR44 is a direct binding partner of GRAF proteins (GRAF1b/2) and marks a subset of tubular endosomes closely aligned with the ER via VAPA/B binding. GRAF2 is required for formation of WDR44-positive tubules. WDR44, together with GRAF2 and MICAL1, is essential for export of neosynthesized E-cadherin, MMP14, and CFTR ΔF508 to the plasma membrane via Rab8/10/11-dependent exocytic pathways.","method":"Co-immunoprecipitation, colocalization/immunofluorescence, siRNA knockdown with cargo export assay, dominant-negative overexpression","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — direct binding shown by Co-IP, functional cargo export assays with KD and dominant negatives, ER contact site localization by imaging; multiple orthogonal methods in single study","pmids":["32344433"],"is_preprint":false},{"year":2019,"finding":"SGK3 kinase phosphorylates WDR44 at Ser346 in vivo and efficiently in vitro, while Akt phosphorylates this site poorly due to an unfavorable n+1 residue. This identifies WDR44 as a preferential SGK3 substrate at endosomes.","method":"Phosphoproteomic screen (genetic and pharmacological), in vitro kinase assay with recombinant SGK3 and WDR44, Phos-tag analysis, SGK3 knockout cells","journal":"The Biochemical journal","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro kinase assay with identified phosphorylation site, in vivo phosphoproteomics, KO validation; single lab but multiple orthogonal methods","pmids":["31665227"],"is_preprint":false},{"year":2022,"finding":"The WDR44 Rab11-binding domain (RBD) interacts with the switch I, switch II, and interswitch regions of Rab11. HDX-MS revealed that WDR44 forms a more extensive interface with the switch II helix of Rab11 compared to FIP3. Mutagenesis of conserved WDR44 residues at this interface disrupted complex formation, and WDR44 specificity for Rab11 over related Rabs was defined at the molecular level. Sgk3-mediated phosphorylation of WDR44 leads to reorganization of the Rab11-binding surface. Interdomain interactions between the WD40 repeats and the N-terminal RBD region were also identified.","method":"AlphaFold2 structural modeling, hydrogen/deuterium exchange mass spectrometry (HDX-MS), site-directed mutagenesis, in vitro biochemical binding assays, Rab selectivity panel","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — HDX-MS structural characterization, extensive mutagenesis at interface, in vitro binding assays with multiple Rab specificity controls; single lab with multiple orthogonal methods","pmids":["36463963"],"is_preprint":false},{"year":2024,"finding":"Missense and nonsense variants in the WD40-repeat domain of WDR44 (an X-linked gene) cause a ciliopathy syndrome. Pathogenic missense variants reduce WDR44 protein abundance due to misfolding of WDR autonomous repeats and proteasomal degradation. Disease severity correlates with increased RAB11 binding by WDR44 variants. Interdomain interactions between the WD40 repeat domain and the N-terminal RAB11-binding domain (RBD) are disrupted by patient variants. WDR44 variants impair ciliogenesis initiation and ciliary signaling.","method":"Patient variant analysis, zebrafish modeling, proteasome inhibition assays, Co-immunoprecipitation (RAB11 binding), ciliogenesis assays, cell-based degradation experiments","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple patient variants modeled in vivo (zebrafish) and in vitro, proteasome inhibition rescue, Co-IP for RAB11 binding, ciliogenesis functional readout; multiple orthogonal methods","pmids":["38191484"],"is_preprint":false},{"year":2024,"finding":"BLTP2 localizes to membrane contact sites involving the ER and tubular endosome network (the same compartment as WDR44) and suppresses ciliogenesis. A strong genetic interaction between BLTP2 and WDR44 was demonstrated: BLTP2 depletion enhanced ciliogenesis, and this effect depends on WDR44 function, placing BLTP2 and WDR44 in the same ciliogenesis-suppressive pathway at ER–tubular endosome contact sites.","method":"siRNA knockdown, epistasis (double depletion), immunofluorescence localization, ciliogenesis assay in RPE-1 cells","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — genetic epistasis with defined phenotypic readout (ciliogenesis), localization data, single lab","pmids":["38536441"],"is_preprint":false},{"year":2025,"finding":"WDR44 was identified as a cytosolic regulator essential for AP-4-mediated TGN export, uncovered via an in vitro vesicle formation assay coupled with quantitative mass spectrometry using AP4ε-deficient cells.","method":"In vitro vesicle formation assay, label-free quantitative mass spectrometry, AP4ε-knockout HeLa cells","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — in vitro reconstitution assay with proteomics identification; functional essentiality demonstrated but mechanistic details limited; single lab","pmids":["41032520"],"is_preprint":false},{"year":2004,"finding":"In C. elegans, SYM-4/WDR44 functions in a developmental pathway that is redundant with the MEC-8-dependent RNA splicing pathway; mec-8; sym-4 double mutants arrest with failure of pharynx attachment to the body cuticle. SYM-4/WDR44 was proposed to act in the same pathway as SYM-3, based on identical double-mutant phenotypes.","method":"Genetic epistasis (synthetic lethality screen, double-mutant phenotype analysis), gene cloning/sequencing","journal":"Genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis in vivo with clear phenotypic readout; replicated/extended from prior work (PMID 10471705); pathway placement established","pmids":["15579686","10471705"],"is_preprint":false},{"year":2023,"finding":"In C. elegans, SYM-3/FAM102A and SYM-4/WDR44 colocalize to intracellular and membrane-associated puncta and likely function together in a complex; proteomics data supports a role in intracellular trafficking. However, no evidence was found for a direct role of SYM-3 or SYM-4 in the apical deposition of aECM components NOAH-1 and FBN-1.","method":"Colocalization by fluorescence microscopy, proteomics (complex identification), loss-of-function analysis with aECM component deposition assay","journal":"Biology open","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — colocalization and proteomics suggest complex, negative result for specific aECM deposition function; multiple methods but mechanistic resolution limited","pmids":["37345480"],"is_preprint":false},{"year":2026,"finding":"WDR44 is a membrane-associated adaptor protein that drives de novo α-synuclein aggregation at the lysosomal membrane in neurons. WDR44 knockdown markedly reduced α-synuclein aggregate formation in neuronal cultures and in vivo, while WDR44 overexpression enhanced aggregation in PD patient-derived iPSC neurons. WDR44 aberrantly accumulates in PD patient brains and colocalizes with Lewy body inclusions. Lysosomal α-synuclein aggregates impaired lysosomal structure and function, and this toxicity was worsened by WDR44 overexpression.","method":"Optogenetic-induced protein aggregation system, siRNA knockdown, overexpression in iPSC-derived neurons, in vivo knockdown, immunofluorescence colocalization with Lewy bodies, lysosomal function assays","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (optogenetics, KD, OE, iPSC neurons, in vivo), but preprint with no peer review yet","pmids":["41993512"],"is_preprint":true}],"current_model":"WDR44 is an X-linked Rab11 effector protein that binds preferentially to GTP-Rab11 via its N-terminal Rab11-binding domain (RBD), which makes extensive contacts with the switch I, switch II, and interswitch regions of Rab11; its WD40 repeat domain normally engages in intramolecular autoinhibition of this interaction, and its abundance is regulated by proteasomal degradation when the WD40 domain misfolds. WDR44 localizes to tubular recycling endosomes at ER contact sites (via VAPA/B), where it negatively regulates ciliogenesis initiation by competing with the pro-ciliogenic Rab11–FIP3–Rabin8 complex—a competition stabilized by Akt-mediated phosphorylation of WDR44 downstream of LPA/LPAR1/PI3K signaling—and also functions in Rab8/10/11-dependent exocytic trafficking of cargo such as E-cadherin and MMP14 in concert with GRAF2 and MICAL1, acts as a cytosolic regulator of AP-4-mediated TGN export, is specifically phosphorylated at Ser346 by SGK3 kinase (not Akt) to reorganize its Rab11-binding surface, and at the lysosomal membrane modulates α-synuclein aggregation relevant to Parkinson's disease pathology."},"narrative":{"mechanistic_narrative":"WDR44 (Rab11BP/Rabphilin-11) is a Rab11 effector that operates at the interface of endosomal recycling, exocytic trafficking, and ciliogenesis control [PMID:10464283, PMID:31204173]. It binds preferentially to the GTP-bound active form of Rab11 through an N-terminal Rab11-binding domain (RBD) that contacts the switch I, switch II, and interswitch regions of Rab11, forming a more extensive switch II interface than the competing effector FIP3 [PMID:10464283, PMID:36463963]; this binding site is normally masked by intramolecular interactions involving the C-terminal WD40 repeat domain, so that conformational change is required to expose it [PMID:10077598, PMID:36463963]. At ER–tubular endosome contact sites, where it is recruited via VAPA/B and the GRAF proteins, WDR44 acts as a negative regulator of ciliogenesis initiation: by occupying a Rab11 effector slot it competes with the pro-ciliogenic Rab11–FIP3–Rabin8 complex, and this competition is reinforced by Akt-dependent stabilization downstream of LPA/LPAR1/PI3K signaling, with WDR44 depletion releasing Rabin8 for preciliary trafficking [PMID:31204173, PMID:32344433, PMID:38536441]. In its trafficking role, WDR44 together with GRAF2 and MICAL1 is required for Rab8/10/11-dependent exocytic export of cargoes including E-cadherin, MMP14, and CFTR ΔF508, and it is also a cytosolic factor essential for AP-4-mediated TGN export [PMID:32344433, PMID:41032520]. WDR44 is a substrate of SGK3, which phosphorylates Ser346 and reorganizes the Rab11-binding surface, whereas Akt phosphorylates this site poorly [PMID:31665227, PMID:36463963]. Missense and nonsense variants in the X-linked WDR44 WD40 domain cause a ciliopathy syndrome; pathogenic variants destabilize the protein through misfolding and proteasomal degradation, disrupt RBD–WD40 interdomain contacts, alter RAB11 binding, and impair ciliogenesis and ciliary signaling [PMID:38191484].","teleology":[{"year":1999,"claim":"Established WDR44 as a bona fide Rab11 effector by showing it binds the active GTP-bound form specifically and is required for proper endosomal recycling, defining its place in membrane traffic.","evidence":"GST pulldown/binding assays, immunofluorescence colocalization, and truncation overexpression with transferrin recycling and migration assays; complemented by domain-mapping in vitro binding showing the internal Rab11 site is masked by the WD40 region and that the truncated form phenocopies dominant-negative Rab11","pmids":["10464283","10077598"],"confidence":"High","gaps":["Structural basis of the Rab11 interface not resolved","Mechanism unmasking the autoinhibited internal binding site in cells undefined"]},{"year":2004,"claim":"Placed the WDR44 ortholog in a developmental pathway in vivo, indicating a conserved trafficking-related function redundant with an RNA splicing pathway.","evidence":"Genetic epistasis and synthetic-lethality analysis of C. elegans mec-8; sym-4 double mutants with gene cloning","pmids":["15579686","10471705"],"confidence":"Medium","gaps":["Molecular function of SYM-4 not defined","Connection to mammalian Rab11 effector role not established at this stage"]},{"year":2019,"claim":"Defined WDR44 as a signaling-controlled brake on ciliogenesis, showing Akt-dependent stabilization of the Rab11a–WDR44 complex blocks ciliation by excluding the pro-ciliogenic Rabin8 machinery.","evidence":"siRNA depletion, phosphomimetic mutant, live-cell imaging of Rabin8 trafficking, Co-IP, and epistasis with LPA/Akt pathway inhibitors","pmids":["31204173"],"confidence":"High","gaps":["Direct Akt phosphosite on WDR44 not pinned down here","How WDR44 mechanistically blocks Rab11–FIP3–Rabin8 assembly at the centriole unresolved"]},{"year":2019,"claim":"Identified the relevant kinase–substrate relationship, showing SGK3 rather than Akt is the efficient kinase for WDR44 Ser346 at endosomes.","evidence":"Phosphoproteomic screen, in vitro kinase assays with recombinant SGK3 and WDR44, Phos-tag analysis, and SGK3 knockout cells","pmids":["31665227"],"confidence":"High","gaps":["Functional consequence of Ser346 phosphorylation on trafficking not tested here","Relationship between SGK3 and Akt inputs on the same regulatory program unclear"]},{"year":2020,"claim":"Resolved where and with whom WDR44 acts, defining ER–tubular endosome contact sites and a GRAF2/MICAL1 module required for exocytic cargo export.","evidence":"Co-IP, colocalization imaging, VAPA/B binding, siRNA knockdown with cargo export assays, and dominant-negative overexpression","pmids":["32344433"],"confidence":"High","gaps":["Hierarchy of recruitment among VAPA/B, GRAF2, and Rab11 not fully ordered","Direct versus indirect role in cargo selection unresolved"]},{"year":2022,"claim":"Provided the molecular structure of the interaction, mapping the RBD onto Rab11 switch regions, explaining Rab specificity, and linking phosphorylation to surface reorganization.","evidence":"AlphaFold2 modeling, HDX-MS, site-directed mutagenesis, in vitro binding assays, and a Rab selectivity panel","pmids":["36463963"],"confidence":"High","gaps":["No experimental high-resolution structure of the full complex","Conformational dynamics of WD40-mediated autoinhibition not directly visualized"]},{"year":2024,"claim":"Connected WDR44 to human disease, establishing that X-linked WD40-domain variants cause a ciliopathy through protein destabilization and altered RAB11 binding.","evidence":"Patient variant analysis, zebrafish modeling, proteasome inhibition rescue, Co-IP for RAB11 binding, and ciliogenesis assays","pmids":["38191484"],"confidence":"High","gaps":["Why disease severity correlates with increased RAB11 binding mechanistically unclear","Tissue-specific ciliary signaling defects not fully delineated"]},{"year":2024,"claim":"Embedded WDR44 in a defined ciliogenesis-suppressive pathway with BLTP2 at ER–tubular endosome contact sites.","evidence":"siRNA knockdown, double-depletion epistasis, immunofluorescence localization, and ciliogenesis assays in RPE-1 cells","pmids":["38536441"],"confidence":"Medium","gaps":["Physical relationship between BLTP2 and WDR44 not established","Molecular role of lipid transfer at these contact sites in ciliogenesis suppression unknown"]},{"year":2025,"claim":"Extended WDR44 function to a distinct secretory route, identifying it as a cytosolic factor essential for AP-4-mediated TGN export.","evidence":"In vitro vesicle formation assay with label-free quantitative mass spectrometry in AP4ε-knockout HeLa cells","pmids":["41032520"],"confidence":"Medium","gaps":["Direct binding partners in the AP-4 pathway not identified","Whether this role requires Rab11 binding unresolved"]},{"year":2026,"claim":"Implicated WDR44 in neurodegenerative pathology, showing it drives lysosomal α-synuclein aggregation relevant to Parkinson's disease.","evidence":"Optogenetic aggregation system, siRNA knockdown, overexpression in iPSC-derived neurons, in vivo knockdown, Lewy body colocalization, and lysosomal function assays (preprint)","pmids":["41993512"],"confidence":"Medium","gaps":["Preprint not yet peer reviewed","Mechanism linking WDR44 membrane association to aggregate nucleation undefined","Relationship to WDR44 Rab11/ciliary functions unclear"]},{"year":null,"claim":"How WDR44's multiple roles—Rab11 recycling, exocytic export, AP-4 TGN export, ciliogenesis suppression, and lysosomal α-synuclein aggregation—are coordinated and toggled by phosphorylation and autoinhibition remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model integrating endosomal, TGN, and lysosomal functions","Trigger relieving WD40-mediated autoinhibition in vivo unknown","Tissue-specific selection among these functions undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[3,8]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,2]}],"localization":[{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[3,4]},{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[3,7]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[8]},{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[0]},{"term_id":"GO:0005764","term_label":"lysosome","supporting_discovery_ids":[11]}],"pathway":[{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[3,8]},{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[2,6]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[2,4]}],"complexes":[],"partners":["RAB11A","GRAF2","MICAL1","VAPA","VAPB","SGK3","BLTP2"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q5JSH3","full_name":"WD repeat-containing protein 44","aliases":["Rab11-binding protein","Rab11BP","Rabphilin-11"],"length_aa":913,"mass_kda":101.4,"function":"Downstream effector for Rab11 which regulates Rab11 intracellular membrane trafficking functions such as endocytic recycling, intracellular ciliogenesis and protein export (PubMed:31204173, PubMed:32344433). ATK1-mediated phosphorylation of WDR44 induces binding to Rab11 which activates endocytic recycling of transferrin receptor back to the plasma membrane (PubMed:31204173). When bound to Rab11, prevents the formation of the ciliogenic Rab11-Rabin8/RAB3IP-RAB11FIP3 complex, therefore inhibiting preciliary trafficking and ciliogenesis (PubMed:31204173). Participates in neo-synthesized protein export by connecting the endoplasmic reticulum (ER) with the endosomal tubule via direct interactions with the integral ER proteins VAPA or VAPB and the endosomal protein GRAFs (GRAF1/ARHGAP26 or GRAF2/ARHGAP10), which facilitates the transfer of proteins such as E-cadherin, MPP14 and CFTR into a Rab8-Rab10-Rab11-dependent export route (PubMed:32344433)","subcellular_location":"Cytoplasm, cytosol; Cytoplasm, perinuclear region; Endosome membrane; Golgi apparatus, trans-Golgi network","url":"https://www.uniprot.org/uniprotkb/Q5JSH3/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/WDR44","classification":"Not Classified","n_dependent_lines":158,"n_total_lines":1208,"dependency_fraction":0.13079470198675497},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"ACTB","stoichiometry":0.2},{"gene":"ACTG1","stoichiometry":0.2},{"gene":"EMC8","stoichiometry":0.2},{"gene":"RAB11A","stoichiometry":0.2},{"gene":"RPP30","stoichiometry":0.2},{"gene":"VAPA","stoichiometry":0.2},{"gene":"VAPB","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/WDR44","total_profiled":1310},"omim":[{"mim_id":"301070","title":"WD REPEAT DOMAIN-CONTAINING PROTEIN 44; WDR44","url":"https://www.omim.org/entry/301070"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Golgi apparatus","reliability":"Supported"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/WDR44"},"hgnc":{"alias_symbol":["DKFZp686L20145","RPH11","RAB11BP","SYM-4"],"prev_symbol":[]},"alphafold":{"accession":"Q5JSH3","domains":[{"cath_id":"-","chopping":"352-373_380-391","consensus_level":"high","plddt":73.5332,"start":352,"end":391}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q5JSH3","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q5JSH3-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q5JSH3-F1-predicted_aligned_error_v6.png","plddt_mean":62.0},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=WDR44","jax_strain_url":"https://www.jax.org/strain/search?query=WDR44"},"sequence":{"accession":"Q5JSH3","fasta_url":"https://rest.uniprot.org/uniprotkb/Q5JSH3.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q5JSH3/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q5JSH3"}},"corpus_meta":[{"pmid":"10464283","id":"PMC_10464283","title":"Rab11BP/Rabphilin-11, a downstream target of rab11 small G protein implicated in vesicle recycling.","date":"1999","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/10464283","citation_count":81,"is_preprint":false},{"pmid":"10077598","id":"PMC_10077598","title":"Identification of a putative effector protein for rab11 that participates in transferrin recycling.","date":"1999","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/10077598","citation_count":75,"is_preprint":false},{"pmid":"31204173","id":"PMC_31204173","title":"Akt Regulates a Rab11-Effector Switch Required for Ciliogenesis.","date":"2019","source":"Developmental cell","url":"https://pubmed.ncbi.nlm.nih.gov/31204173","citation_count":62,"is_preprint":false},{"pmid":"25798732","id":"PMC_25798732","title":"FBN-1, a fibrillin-related protein, is required for resistance of the epidermis to mechanical deformation during C. elegans embryogenesis.","date":"2015","source":"eLife","url":"https://pubmed.ncbi.nlm.nih.gov/25798732","citation_count":58,"is_preprint":false},{"pmid":"10471705","id":"PMC_10471705","title":"Functional overlap between the mec-8 gene and five sym genes in Caenorhabditis elegans.","date":"1999","source":"Genetics","url":"https://pubmed.ncbi.nlm.nih.gov/10471705","citation_count":42,"is_preprint":false},{"pmid":"32344433","id":"PMC_32344433","title":"GRAF2, WDR44, and MICAL1 mediate Rab8/10/11-dependent export of E-cadherin, MMP14, and CFTR ΔF508.","date":"2020","source":"The Journal of cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/32344433","citation_count":32,"is_preprint":false},{"pmid":"18316204","id":"PMC_18316204","title":"Comprehensive spatiotemporal transcriptomic analyses of the ganglionic eminences demonstrate the uniqueness of its caudal subdivision.","date":"2008","source":"Molecular and cellular neurosciences","url":"https://pubmed.ncbi.nlm.nih.gov/18316204","citation_count":31,"is_preprint":false},{"pmid":"30812545","id":"PMC_30812545","title":"Pathogenic Specialization and Pathotype Distribution of Puccinia hordei in Australia, 1992 to 2001.","date":"2003","source":"Plant disease","url":"https://pubmed.ncbi.nlm.nih.gov/30812545","citation_count":25,"is_preprint":false},{"pmid":"15579686","id":"PMC_15579686","title":"The identities of sym-2, sym-3 and sym-4, three genes that are synthetically lethal with mec-8 in Caenorhabditis elegans.","date":"2004","source":"Genetics","url":"https://pubmed.ncbi.nlm.nih.gov/15579686","citation_count":19,"is_preprint":false},{"pmid":"31665227","id":"PMC_31665227","title":"Phosphoproteomics reveals that the hVPS34 regulated SGK3 kinase specifically phosphorylates endosomal proteins including Syntaxin-7, Syntaxin-12, RFIP4 and WDR44.","date":"2019","source":"The Biochemical journal","url":"https://pubmed.ncbi.nlm.nih.gov/31665227","citation_count":16,"is_preprint":false},{"pmid":"38536441","id":"PMC_38536441","title":"Bridge-like lipid transfer protein family member 2 suppresses ciliogenesis.","date":"2024","source":"Molecular biology of the cell","url":"https://pubmed.ncbi.nlm.nih.gov/38536441","citation_count":16,"is_preprint":false},{"pmid":"32764425","id":"PMC_32764425","title":"Discovery of Molecular DNA Methylation-Based Biomarkers through Genome-Wide Analysis of Response Patterns to BCG for Bladder Cancer.","date":"2020","source":"Cells","url":"https://pubmed.ncbi.nlm.nih.gov/32764425","citation_count":15,"is_preprint":false},{"pmid":"12231990","id":"PMC_12231990","title":"Five Nodulation Mutants of White Sweetclover (Melilotus alba Desr.) 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Both proteins colocalized at perinuclear regions (Golgi/recycling endosomes) and along microtubules. Overexpression of the C-terminal fragment lacking the Rab11-binding domain reduced transferrin accumulation at perinuclear regions and inhibited cell migration.\",\n      \"method\": \"GST pulldown/binding assay, co-localization by immunofluorescence, overexpression of truncation mutants with transferrin recycling assay and cell migration assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal binding assays, colocalization, functional overexpression truncation experiments replicated independently in two labs (PMIDs 10464283 and 10077598)\",\n      \"pmids\": [\"10464283\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Rab11BP (WDR44) interacts with GTP-Rab11 via an internal binding site (residues 334–504) that is normally masked by the C-terminal WD40 domain region; partial denaturation or cellular conformational change is required to expose this site. Overexpression of the truncated form rab11BP(1-504) inhibited transferrin recycling as strongly as dominant-negative Rab11, and this inhibition was rescued by co-expression of a non-prenylatable Rab11.\",\n      \"method\": \"In vitro binding assay with recombinant proteins (partial denaturation), overexpression of full-length and truncation mutants, transferrin recycling assay, epistasis by co-expression rescue\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — in vitro binding with defined domain mapping, functional transferrin recycling assay with epistasis rescue, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"10077598\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Akt kinase stabilizes the Rab11a–WDR44 interaction downstream of LPA/LPAR1/PI3K signaling, preventing ciliogenesis initiation. A WDR44 phosphomimetic mutant (mimicking Akt phosphorylation) blocks ciliogenesis. WDR44 depletion promotes Rabin8 preciliary trafficking and ciliogenesis-initiating events at the mother centriole, indicating that WDR44 occupies a Rab11 effector slot that competes with the pro-ciliogenic Rab11-FIP3-Rabin8 complex.\",\n      \"method\": \"siRNA depletion of WDR44, phosphomimetic mutation, live-cell imaging of Rabin8 trafficking, co-immunoprecipitation, epistasis with LPA/Akt pathway inhibitors\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (KD, phosphomimetic mutant, Co-IP, live imaging) in a single rigorous study placing WDR44 in Akt-Rab11 signaling axis\",\n      \"pmids\": [\"31204173\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"WDR44 is a direct binding partner of GRAF proteins (GRAF1b/2) and marks a subset of tubular endosomes closely aligned with the ER via VAPA/B binding. GRAF2 is required for formation of WDR44-positive tubules. WDR44, together with GRAF2 and MICAL1, is essential for export of neosynthesized E-cadherin, MMP14, and CFTR ΔF508 to the plasma membrane via Rab8/10/11-dependent exocytic pathways.\",\n      \"method\": \"Co-immunoprecipitation, colocalization/immunofluorescence, siRNA knockdown with cargo export assay, dominant-negative overexpression\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct binding shown by Co-IP, functional cargo export assays with KD and dominant negatives, ER contact site localization by imaging; multiple orthogonal methods in single study\",\n      \"pmids\": [\"32344433\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"SGK3 kinase phosphorylates WDR44 at Ser346 in vivo and efficiently in vitro, while Akt phosphorylates this site poorly due to an unfavorable n+1 residue. This identifies WDR44 as a preferential SGK3 substrate at endosomes.\",\n      \"method\": \"Phosphoproteomic screen (genetic and pharmacological), in vitro kinase assay with recombinant SGK3 and WDR44, Phos-tag analysis, SGK3 knockout cells\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro kinase assay with identified phosphorylation site, in vivo phosphoproteomics, KO validation; single lab but multiple orthogonal methods\",\n      \"pmids\": [\"31665227\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"The WDR44 Rab11-binding domain (RBD) interacts with the switch I, switch II, and interswitch regions of Rab11. HDX-MS revealed that WDR44 forms a more extensive interface with the switch II helix of Rab11 compared to FIP3. Mutagenesis of conserved WDR44 residues at this interface disrupted complex formation, and WDR44 specificity for Rab11 over related Rabs was defined at the molecular level. Sgk3-mediated phosphorylation of WDR44 leads to reorganization of the Rab11-binding surface. Interdomain interactions between the WD40 repeats and the N-terminal RBD region were also identified.\",\n      \"method\": \"AlphaFold2 structural modeling, hydrogen/deuterium exchange mass spectrometry (HDX-MS), site-directed mutagenesis, in vitro biochemical binding assays, Rab selectivity panel\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — HDX-MS structural characterization, extensive mutagenesis at interface, in vitro binding assays with multiple Rab specificity controls; single lab with multiple orthogonal methods\",\n      \"pmids\": [\"36463963\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Missense and nonsense variants in the WD40-repeat domain of WDR44 (an X-linked gene) cause a ciliopathy syndrome. Pathogenic missense variants reduce WDR44 protein abundance due to misfolding of WDR autonomous repeats and proteasomal degradation. Disease severity correlates with increased RAB11 binding by WDR44 variants. Interdomain interactions between the WD40 repeat domain and the N-terminal RAB11-binding domain (RBD) are disrupted by patient variants. WDR44 variants impair ciliogenesis initiation and ciliary signaling.\",\n      \"method\": \"Patient variant analysis, zebrafish modeling, proteasome inhibition assays, Co-immunoprecipitation (RAB11 binding), ciliogenesis assays, cell-based degradation experiments\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple patient variants modeled in vivo (zebrafish) and in vitro, proteasome inhibition rescue, Co-IP for RAB11 binding, ciliogenesis functional readout; multiple orthogonal methods\",\n      \"pmids\": [\"38191484\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"BLTP2 localizes to membrane contact sites involving the ER and tubular endosome network (the same compartment as WDR44) and suppresses ciliogenesis. A strong genetic interaction between BLTP2 and WDR44 was demonstrated: BLTP2 depletion enhanced ciliogenesis, and this effect depends on WDR44 function, placing BLTP2 and WDR44 in the same ciliogenesis-suppressive pathway at ER–tubular endosome contact sites.\",\n      \"method\": \"siRNA knockdown, epistasis (double depletion), immunofluorescence localization, ciliogenesis assay in RPE-1 cells\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — genetic epistasis with defined phenotypic readout (ciliogenesis), localization data, single lab\",\n      \"pmids\": [\"38536441\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"WDR44 was identified as a cytosolic regulator essential for AP-4-mediated TGN export, uncovered via an in vitro vesicle formation assay coupled with quantitative mass spectrometry using AP4ε-deficient cells.\",\n      \"method\": \"In vitro vesicle formation assay, label-free quantitative mass spectrometry, AP4ε-knockout HeLa cells\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — in vitro reconstitution assay with proteomics identification; functional essentiality demonstrated but mechanistic details limited; single lab\",\n      \"pmids\": [\"41032520\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"In C. elegans, SYM-4/WDR44 functions in a developmental pathway that is redundant with the MEC-8-dependent RNA splicing pathway; mec-8; sym-4 double mutants arrest with failure of pharynx attachment to the body cuticle. SYM-4/WDR44 was proposed to act in the same pathway as SYM-3, based on identical double-mutant phenotypes.\",\n      \"method\": \"Genetic epistasis (synthetic lethality screen, double-mutant phenotype analysis), gene cloning/sequencing\",\n      \"journal\": \"Genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis in vivo with clear phenotypic readout; replicated/extended from prior work (PMID 10471705); pathway placement established\",\n      \"pmids\": [\"15579686\", \"10471705\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"In C. elegans, SYM-3/FAM102A and SYM-4/WDR44 colocalize to intracellular and membrane-associated puncta and likely function together in a complex; proteomics data supports a role in intracellular trafficking. However, no evidence was found for a direct role of SYM-3 or SYM-4 in the apical deposition of aECM components NOAH-1 and FBN-1.\",\n      \"method\": \"Colocalization by fluorescence microscopy, proteomics (complex identification), loss-of-function analysis with aECM component deposition assay\",\n      \"journal\": \"Biology open\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — colocalization and proteomics suggest complex, negative result for specific aECM deposition function; multiple methods but mechanistic resolution limited\",\n      \"pmids\": [\"37345480\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"WDR44 is a membrane-associated adaptor protein that drives de novo α-synuclein aggregation at the lysosomal membrane in neurons. WDR44 knockdown markedly reduced α-synuclein aggregate formation in neuronal cultures and in vivo, while WDR44 overexpression enhanced aggregation in PD patient-derived iPSC neurons. WDR44 aberrantly accumulates in PD patient brains and colocalizes with Lewy body inclusions. Lysosomal α-synuclein aggregates impaired lysosomal structure and function, and this toxicity was worsened by WDR44 overexpression.\",\n      \"method\": \"Optogenetic-induced protein aggregation system, siRNA knockdown, overexpression in iPSC-derived neurons, in vivo knockdown, immunofluorescence colocalization with Lewy bodies, lysosomal function assays\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (optogenetics, KD, OE, iPSC neurons, in vivo), but preprint with no peer review yet\",\n      \"pmids\": [\"41993512\"],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"WDR44 is an X-linked Rab11 effector protein that binds preferentially to GTP-Rab11 via its N-terminal Rab11-binding domain (RBD), which makes extensive contacts with the switch I, switch II, and interswitch regions of Rab11; its WD40 repeat domain normally engages in intramolecular autoinhibition of this interaction, and its abundance is regulated by proteasomal degradation when the WD40 domain misfolds. WDR44 localizes to tubular recycling endosomes at ER contact sites (via VAPA/B), where it negatively regulates ciliogenesis initiation by competing with the pro-ciliogenic Rab11–FIP3–Rabin8 complex—a competition stabilized by Akt-mediated phosphorylation of WDR44 downstream of LPA/LPAR1/PI3K signaling—and also functions in Rab8/10/11-dependent exocytic trafficking of cargo such as E-cadherin and MMP14 in concert with GRAF2 and MICAL1, acts as a cytosolic regulator of AP-4-mediated TGN export, is specifically phosphorylated at Ser346 by SGK3 kinase (not Akt) to reorganize its Rab11-binding surface, and at the lysosomal membrane modulates α-synuclein aggregation relevant to Parkinson's disease pathology.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"WDR44 (Rab11BP/Rabphilin-11) is a Rab11 effector that operates at the interface of endosomal recycling, exocytic trafficking, and ciliogenesis control [#0, #2]. It binds preferentially to the GTP-bound active form of Rab11 through an N-terminal Rab11-binding domain (RBD) that contacts the switch I, switch II, and interswitch regions of Rab11, forming a more extensive switch II interface than the competing effector FIP3 [#0, #5]; this binding site is normally masked by intramolecular interactions involving the C-terminal WD40 repeat domain, so that conformational change is required to expose it [#1, #5]. At ER\\u2013tubular endosome contact sites, where it is recruited via VAPA/B and the GRAF proteins, WDR44 acts as a negative regulator of ciliogenesis initiation: by occupying a Rab11 effector slot it competes with the pro-ciliogenic Rab11\\u2013FIP3\\u2013Rabin8 complex, and this competition is reinforced by Akt-dependent stabilization downstream of LPA/LPAR1/PI3K signaling, with WDR44 depletion releasing Rabin8 for preciliary trafficking [#2, #3, #7]. In its trafficking role, WDR44 together with GRAF2 and MICAL1 is required for Rab8/10/11-dependent exocytic export of cargoes including E-cadherin, MMP14, and CFTR \\u0394F508, and it is also a cytosolic factor essential for AP-4-mediated TGN export [#3, #8]. WDR44 is a substrate of SGK3, which phosphorylates Ser346 and reorganizes the Rab11-binding surface, whereas Akt phosphorylates this site poorly [#4, #5]. Missense and nonsense variants in the X-linked WDR44 WD40 domain cause a ciliopathy syndrome; pathogenic variants destabilize the protein through misfolding and proteasomal degradation, disrupt RBD\\u2013WD40 interdomain contacts, alter RAB11 binding, and impair ciliogenesis and ciliary signaling [#6].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Established WDR44 as a bona fide Rab11 effector by showing it binds the active GTP-bound form specifically and is required for proper endosomal recycling, defining its place in membrane traffic.\",\n      \"evidence\": \"GST pulldown/binding assays, immunofluorescence colocalization, and truncation overexpression with transferrin recycling and migration assays; complemented by domain-mapping in vitro binding showing the internal Rab11 site is masked by the WD40 region and that the truncated form phenocopies dominant-negative Rab11\",\n      \"pmids\": [\"10464283\", \"10077598\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of the Rab11 interface not resolved\", \"Mechanism unmasking the autoinhibited internal binding site in cells undefined\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Placed the WDR44 ortholog in a developmental pathway in vivo, indicating a conserved trafficking-related function redundant with an RNA splicing pathway.\",\n      \"evidence\": \"Genetic epistasis and synthetic-lethality analysis of C. elegans mec-8; sym-4 double mutants with gene cloning\",\n      \"pmids\": [\"15579686\", \"10471705\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular function of SYM-4 not defined\", \"Connection to mammalian Rab11 effector role not established at this stage\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Defined WDR44 as a signaling-controlled brake on ciliogenesis, showing Akt-dependent stabilization of the Rab11a\\u2013WDR44 complex blocks ciliation by excluding the pro-ciliogenic Rabin8 machinery.\",\n      \"evidence\": \"siRNA depletion, phosphomimetic mutant, live-cell imaging of Rabin8 trafficking, Co-IP, and epistasis with LPA/Akt pathway inhibitors\",\n      \"pmids\": [\"31204173\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct Akt phosphosite on WDR44 not pinned down here\", \"How WDR44 mechanistically blocks Rab11\\u2013FIP3\\u2013Rabin8 assembly at the centriole unresolved\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identified the relevant kinase\\u2013substrate relationship, showing SGK3 rather than Akt is the efficient kinase for WDR44 Ser346 at endosomes.\",\n      \"evidence\": \"Phosphoproteomic screen, in vitro kinase assays with recombinant SGK3 and WDR44, Phos-tag analysis, and SGK3 knockout cells\",\n      \"pmids\": [\"31665227\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of Ser346 phosphorylation on trafficking not tested here\", \"Relationship between SGK3 and Akt inputs on the same regulatory program unclear\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Resolved where and with whom WDR44 acts, defining ER\\u2013tubular endosome contact sites and a GRAF2/MICAL1 module required for exocytic cargo export.\",\n      \"evidence\": \"Co-IP, colocalization imaging, VAPA/B binding, siRNA knockdown with cargo export assays, and dominant-negative overexpression\",\n      \"pmids\": [\"32344433\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Hierarchy of recruitment among VAPA/B, GRAF2, and Rab11 not fully ordered\", \"Direct versus indirect role in cargo selection unresolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Provided the molecular structure of the interaction, mapping the RBD onto Rab11 switch regions, explaining Rab specificity, and linking phosphorylation to surface reorganization.\",\n      \"evidence\": \"AlphaFold2 modeling, HDX-MS, site-directed mutagenesis, in vitro binding assays, and a Rab selectivity panel\",\n      \"pmids\": [\"36463963\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No experimental high-resolution structure of the full complex\", \"Conformational dynamics of WD40-mediated autoinhibition not directly visualized\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Connected WDR44 to human disease, establishing that X-linked WD40-domain variants cause a ciliopathy through protein destabilization and altered RAB11 binding.\",\n      \"evidence\": \"Patient variant analysis, zebrafish modeling, proteasome inhibition rescue, Co-IP for RAB11 binding, and ciliogenesis assays\",\n      \"pmids\": [\"38191484\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Why disease severity correlates with increased RAB11 binding mechanistically unclear\", \"Tissue-specific ciliary signaling defects not fully delineated\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Embedded WDR44 in a defined ciliogenesis-suppressive pathway with BLTP2 at ER\\u2013tubular endosome contact sites.\",\n      \"evidence\": \"siRNA knockdown, double-depletion epistasis, immunofluorescence localization, and ciliogenesis assays in RPE-1 cells\",\n      \"pmids\": [\"38536441\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Physical relationship between BLTP2 and WDR44 not established\", \"Molecular role of lipid transfer at these contact sites in ciliogenesis suppression unknown\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Extended WDR44 function to a distinct secretory route, identifying it as a cytosolic factor essential for AP-4-mediated TGN export.\",\n      \"evidence\": \"In vitro vesicle formation assay with label-free quantitative mass spectrometry in AP4\\u03b5-knockout HeLa cells\",\n      \"pmids\": [\"41032520\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct binding partners in the AP-4 pathway not identified\", \"Whether this role requires Rab11 binding unresolved\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Implicated WDR44 in neurodegenerative pathology, showing it drives lysosomal \\u03b1-synuclein aggregation relevant to Parkinson's disease.\",\n      \"evidence\": \"Optogenetic aggregation system, siRNA knockdown, overexpression in iPSC-derived neurons, in vivo knockdown, Lewy body colocalization, and lysosomal function assays (preprint)\",\n      \"pmids\": [\"41993512\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Preprint not yet peer reviewed\", \"Mechanism linking WDR44 membrane association to aggregate nucleation undefined\", \"Relationship to WDR44 Rab11/ciliary functions unclear\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How WDR44's multiple roles\\u2014Rab11 recycling, exocytic export, AP-4 TGN export, ciliogenesis suppression, and lysosomal \\u03b1-synuclein aggregation\\u2014are coordinated and toggled by phosphorylation and autoinhibition remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model integrating endosomal, TGN, and lysosomal functions\", \"Trigger relieving WD40-mediated autoinhibition in vivo unknown\", \"Tissue-specific selection among these functions undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [3, 8]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 2]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [3, 4]},\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [3, 7]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [8]},\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0005764\", \"supporting_discovery_ids\": [11]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [3, 8]},\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [2, 6]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [2, 4]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"RAB11A\", \"GRAF2\", \"MICAL1\", \"VAPA\", \"VAPB\", \"SGK3\", \"BLTP2\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"tie","faith_supported":6,"faith_total":6,"faith_pct":100.0}}