{"gene":"LRBA","run_date":"2026-06-10T02:59:50","timeline":{"discoveries":[{"year":2015,"finding":"LRBA colocalizes with CTLA4 in endosomal vesicles, and LRBA deficiency or knockdown increases CTLA4 turnover via lysosomal degradation, resulting in reduced CTLA4 protein levels in FoxP3+ regulatory T cells and activated conventional T cells. Inhibition of lysosomal degradation with chloroquine prevented CTLA4 loss in LRBA-deficient cells.","method":"Subcellular colocalization imaging, knockdown experiments, chloroquine rescue assay, flow cytometry for CTLA4 protein levels","journal":"Science","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal colocalization, functional rescue with chloroquine, KD with defined molecular phenotype; replicated across multiple cell types and subsequently confirmed by independent labs","pmids":["26206937"],"is_preprint":false},{"year":2021,"finding":"LRBA is required for effective CTLA-4 recycling by delivering CTLA-4 to Rab11+ recycling compartments. In LRBA-deficient Jurkat cells, CTLA-4 recycling is markedly impaired and CTLA-4 undergoes increased lysosomal degradation. LRBA deficiency reduces CTLA-4 colocalization with Rab11, placing LRBA upstream of Rab11 in the recycling pathway. Constitutively active Rab11 could not rescue CTLA-4 recycling in LRBA-deficient cells.","method":"Dominant-negative and constitutively active Rab GTPase expression, LRBA knockdown/knockout in HeLa and Jurkat cells, surface CTLA-4 expression assay, colocalization microscopy","journal":"Immunology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (DN/CA Rab mutants, KO, colocalization), single lab, functionally validated pathway placement","pmids":["33960403"],"is_preprint":false},{"year":2004,"finding":"Crystal structure of the PH-BEACH domain of human LRBA/BGL at 2.4 Å resolution shows the PH domain has canonical PH-domain backbone fold but cannot bind phospholipids. The BEACH domain contains a core of partially extended peptide segments flanked by helices. The PH and BEACH domains associate intimately, and surface plasmon resonance (using FAN as a model) confirmed high-affinity PH-BEACH interaction (Kd ~120 nM).","method":"X-ray crystallography, surface plasmon resonance binding assay","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure with SPR validation; two orthogonal methods in one study","pmids":["15554694"],"is_preprint":false},{"year":2017,"finding":"LRBA deficiency in C57BL/6 mice (CRISPR/Cas9 knockout) causes a cell-autonomous reduction in CTLA-4 accumulation within CD4+ effector T cells and FOXP3+ Tregs. In young mice or chimeric mice where only half of T cells are LRBA-deficient, low CTLA-4 was the only detectable Treg abnormality.","method":"CRISPR/Cas9 gene targeting, bone marrow chimeras, flow cytometry for CTLA-4 and FOXP3","journal":"Immunology and cell biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — clean KO with defined cellular phenotype, chimeric rescue experiment establishing cell-autonomy","pmids":["28611475"],"is_preprint":false},{"year":2007,"finding":"SEL-2, the C. elegans homolog of LRBA/neurobeachin, is a negative regulator of LIN-12/Notch activity in vulval precursor cells. Loss of sel-2 causes basolateral mislocalization and increased accumulation of LIN-12, impairs downregulation of basolateral LET-23/EGFR, and leads to aberrant FM4-64 lipophilic dye accumulation in intestinal epithelium when presented basolaterally — indicating SEL-2/LRBA is involved in endosomal trafficking and efficient delivery of cell-surface proteins to the lysosome.","method":"C. elegans genetics (loss-of-function), fluorescence microscopy, lipophilic dye uptake assay","journal":"Development","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean loss-of-function in ortholog with defined trafficking phenotype, two orthogonal readouts; ortholog study, not direct human/mouse data","pmids":["17215302"],"is_preprint":false},{"year":2019,"finding":"In LRBA-deficient mice, dendritic cells exhibit excessive IRF3/7- and PI3K/mTORC1-dependent signaling and type I IFN production in response to endosomal TLR3, TLR7, and TLR9 stimulation. Knockout of Unc93b1 (required for TLR3/7/9 trafficking to endosomes) substantially reduced cytokine expression and DSS-colitis sensitivity in LRBA-deficient mice, placing LRBA as a negative regulator of endosomal TLR signaling.","method":"ENU forward genetic screen, Lrba knockout mice, Unc93b1 double-knockout epistasis, cytokine measurement by ELISA/RNA, DSS colitis model","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis (Unc93b1 knockout rescue), in vitro TLR stimulation assays, in vivo colitis model; multiple orthogonal methods","pmids":["31097594"],"is_preprint":false},{"year":2017,"finding":"LRBA deficiency leads to impaired CTLA4-mediated suppression of follicular helper T (TFH) cell differentiation. LRBA-sufficient but not LRBA-deficient regulatory T cells suppressed in vitro TFH cell differentiation in a CTLA4-dependent manner. LRBA-deficient TFH cells supported in vitro antibody production by naive B cells.","method":"In vitro TFH differentiation assay, Treg suppression co-culture assay, B cell–TFH co-culture immunoglobulin production assay","journal":"The Journal of allergy and clinical immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional in vitro assays with defined cellular readouts, single lab, two orthogonal assays","pmids":["28601686"],"is_preprint":false},{"year":2017,"finding":"LRBA is required for maintenance of cochlear hair cell stereociliary bundles and hearing. LRBA knockout mice show progressive sensorineural hearing loss with partial degeneration of inner and outer hair cell stereocilia during the second postnatal week. LRBA deficiency is associated with reduced abundance of radixin and Nherf2 (adaptor proteins critical for stereocilia mechanical stability) at the basal taper region of stereocilia.","method":"LRBA knockout mouse model, auditory brainstem response/electrophysiology, scanning electron microscopy of hair bundles, immunofluorescence/Western blot for radixin and Nherf2","journal":"EMBO reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO mouse with defined structural and functional phenotype, multiple readouts; single lab","pmids":["28893864"],"is_preprint":false},{"year":2017,"finding":"LRBA promotes the localization of the heterotrimeric G-protein Golf (αolf, β1, γ13 subunits) to olfactory cilia. LRBA-KO mice show markedly reduced levels (20–40% of wild-type) of all three Golf subunits in olfactory cilia, impaired olfactory electro-olfactogram responses, and smaller olfactory bulbs, without gross defects in cilia morphology or most other cilia proteins.","method":"LRBA knockout mice, electro-olfactogram recordings, immunofluorescence/Western blot for Golf subunits in cilia fractions, food-finding behavioral assay","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO mouse with defined subcellular localization phenotype, functional electrophysiology and behavior, multiple orthogonal methods; single lab","pmids":["28814779"],"is_preprint":false},{"year":2004,"finding":"LRBA expression is regulated by p53 (repressor) and E2F1 (activator) at the promoter level. Inhibition of LRBA by RNA interference or a dominant-negative mutant causes significant growth inhibition of cancer cells. The dominant-negative LRBA mutant affects EGFR phosphorylation, suggesting LRBA functions in the mammalian EGFR pathway.","method":"Microarray and real-time PCR for expression, promoter reporter assay (p53/E2F1), RNAi knockdown with cell proliferation assay, dominant-negative overexpression with EGFR phosphorylation assay","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — loss-of-function with phenotypic readout, dominant-negative functional assay; single lab, mechanistic pathway placement indirect","pmids":["15064745"],"is_preprint":false},{"year":2017,"finding":"Using lysosomal-blocking compounds (e.g., chloroquine), LRBA mutations can be functionally distinguished from direct CTLA-4 mutations: blocking lysosomal degradation rescues surface CTLA-4 in LRBA-deficient but not in CTLA-4-deficient cells, indicating the functional defect in LRBA deficiency is specifically at the trafficking/degradation step.","method":"Flow cytometry for CTLA-4 levels with and without lysosomal inhibitors, stimulation assays on primary T cells from patients","journal":"Blood","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological rescue experiment on patient primary cells, single lab, two orthogonal assays","pmids":["28159733"],"is_preprint":false},{"year":2012,"finding":"Homozygous loss-of-function mutations in LRBA abolish LRBA protein expression and result in defective in vitro B cell activation, plasmablast formation, immunoglobulin secretion, and reduced autophagy, establishing LRBA as required for normal B cell activation and autophagy.","method":"Genetic linkage analysis, gene sequencing, Western blot (protein absence), in vitro B cell activation and proliferation assays, autophagy assays","journal":"American journal of human genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — patient loss-of-function with defined in vitro B cell functional readouts, single lab","pmids":["22608502"],"is_preprint":false},{"year":1992,"finding":"CDC4L (an alias for LRBA) was identified as a novel human gene with homology to yeast CDC4, driven by an endogenous RTVL-H long terminal repeat, establishing it as a cellular gene with a ~862 bp open reading frame expressed in teratocarcinoma cells.","method":"Differential screening of cDNA library, sequencing, structural analysis of open reading frames","journal":"Genomics","confidence":"Low","confidence_rationale":"Tier 3 / Weak — identification/cloning only, no functional mechanistic experiment on the protein","pmids":["1505956"],"is_preprint":false}],"current_model":"LRBA is a BEACH domain-containing endosomal trafficking protein that protects CTLA-4 from lysosomal degradation by recycling internalized CTLA-4 through Rab11+ compartments back to the cell surface; its loss leads to reduced CTLA-4 expression on regulatory T cells, exaggerated TFH responses and autoimmunity, while LRBA also limits endosomal TLR signaling in dendritic cells, promotes Golf G-protein localization to olfactory cilia, and maintains cochlear hair cell stereocilia integrity through regulation of radixin and Nherf2 abundance."},"narrative":{"mechanistic_narrative":"LRBA is a BEACH domain-containing endosomal trafficking regulator that controls the surface availability of internalized membrane receptors, most prominently the immune checkpoint receptor CTLA-4 [PMID:26206937, PMID:33960403]. LRBA colocalizes with CTLA-4 in endosomal vesicles and protects it from lysosomal degradation: loss of LRBA accelerates CTLA-4 turnover and lowers CTLA-4 protein in FOXP3+ regulatory and activated conventional T cells, a defect reversed by blocking lysosomal degradation with chloroquine [PMID:26206937, PMID:28159733]. Mechanistically, LRBA acts upstream of Rab11 by delivering internalized CTLA-4 to Rab11+ recycling compartments for return to the cell surface; constitutively active Rab11 cannot bypass LRBA loss [PMID:33960403]. This trafficking function is cell-autonomous in T cells [PMID:28611475] and underlies an immune-regulatory role, as LRBA-dependent CTLA-4 enables Tregs to suppress follicular helper T cell differentiation and limit B cell antibody production [PMID:28601686], while LRBA deficiency impairs B cell activation and autophagy [PMID:22608502]. Beyond CTLA-4, LRBA negatively regulates endosomal TLR3/7/9 signaling in dendritic cells, restraining IRF3/7- and PI3K/mTORC1-dependent type I IFN production [PMID:31097594], and supports the localization of select membrane-associated proteins in sensory tissues: it promotes Golf G-protein delivery to olfactory cilia [PMID:28814779] and maintains cochlear hair cell stereocilia by sustaining radixin and Nherf2 abundance [PMID:28893864]. Structurally, its tandem PH-BEACH module forms an intimate, high-affinity intramolecular unit, though the PH domain does not bind phospholipids [PMID:15554694].","teleology":[{"year":1992,"claim":"Established the existence of the gene as a distinct human transcript, providing the molecular entity later characterized functionally.","evidence":"Differential cDNA library screening and sequencing in teratocarcinoma cells","pmids":["1505956"],"confidence":"Low","gaps":["Identification/cloning only with no functional assay","No protein-level or mechanistic characterization","Relationship to trafficking function unestablished"]},{"year":2004,"claim":"Resolved the architecture of the signature PH-BEACH module, showing the PH and BEACH domains form a tightly associated unit but the PH domain is not a canonical phospholipid sensor.","evidence":"X-ray crystallography at 2.4 Å with SPR binding validation using FAN as a model","pmids":["15554694"],"confidence":"High","gaps":["Function of the BEACH domain in trafficking not defined","No structure of full-length protein or substrate-bound state","Does not explain how the module engages cargo"]},{"year":2004,"claim":"First functional placement of LRBA in a receptor-handling pathway, linking it to cell proliferation and EGFR signaling under p53/E2F1 transcriptional control.","evidence":"Promoter reporter assays, RNAi knockdown with proliferation readout, and dominant-negative EGFR phosphorylation assay in cancer cells","pmids":["15064745"],"confidence":"Medium","gaps":["EGFR pathway connection is indirect","Mechanism linking LRBA to EGFR phosphorylation unresolved","Single lab, no in vivo confirmation"]},{"year":2007,"claim":"Demonstrated through an ortholog that the LRBA family functions in endosomal trafficking and lysosomal delivery of cell-surface proteins, foreshadowing the human receptor-recycling role.","evidence":"C. elegans sel-2 loss-of-function genetics, fluorescence microscopy, and lipophilic dye uptake assays","pmids":["17215302"],"confidence":"Medium","gaps":["Ortholog study, not direct human/mouse data","Notch/EGFR substrate specificity may not transfer to mammals","Molecular step within trafficking not defined"]},{"year":2012,"claim":"Established loss-of-function LRBA mutations as causative of a human immune phenotype, tying the gene to B cell activation and autophagy.","evidence":"Genetic linkage, sequencing, Western blot for protein absence, and in vitro B cell activation/autophagy assays from patients","pmids":["22608502"],"confidence":"Medium","gaps":["Molecular basis of the autophagy defect not defined","Did not yet identify CTLA-4 as the key target","Single-lab patient cohort"]},{"year":2015,"claim":"Identified CTLA-4 as a key LRBA cargo and defined the mechanism: LRBA protects internalized CTLA-4 from lysosomal degradation, explaining low CTLA-4 in LRBA deficiency.","evidence":"Endosomal colocalization imaging, knockdown, chloroquine rescue, and flow cytometry across T cell subsets","pmids":["26206937"],"confidence":"High","gaps":["Did not define which recycling compartment LRBA routes CTLA-4 through","Direct LRBA–CTLA-4 binding interface not mapped","Mechanism of cargo selection unknown"]},{"year":2017,"claim":"Showed the CTLA-4 defect is cell-autonomous in T cells and is the earliest detectable Treg abnormality, isolating the primary lesion from downstream immune dysregulation.","evidence":"CRISPR/Cas9 knockout mice and bone marrow chimeras with flow cytometry","pmids":["28611475"],"confidence":"High","gaps":["Does not address LRBA functions outside T cells","Trafficking step not dissected in vivo"]},{"year":2017,"claim":"Connected the molecular CTLA-4 defect to immune-regulatory consequences, showing LRBA-dependent CTLA-4 enables Treg suppression of TFH differentiation and antibody production.","evidence":"In vitro TFH differentiation, Treg suppression co-culture, and B cell–TFH immunoglobulin assays","pmids":["28601686"],"confidence":"Medium","gaps":["In vitro assays only","Single lab","Quantitative contribution of TFH dysregulation to disease unresolved"]},{"year":2017,"claim":"Provided a clinical functional test distinguishing LRBA from CTLA-4 defects, confirming the LRBA lesion lies at the trafficking/degradation step.","evidence":"Flow cytometry for surface CTLA-4 with and without lysosomal inhibitors on patient primary T cells","pmids":["28159733"],"confidence":"Medium","gaps":["Single-lab patient cohort","Does not resolve the molecular trafficking machinery"]},{"year":2017,"claim":"Extended LRBA function beyond immunity, showing it maintains cochlear hair cell stereocilia by sustaining radixin and Nherf2 abundance.","evidence":"LRBA knockout mice with ABR electrophysiology, scanning electron microscopy, and immunoblot for radixin/Nherf2","pmids":["28893864"],"confidence":"Medium","gaps":["Mechanism by which LRBA regulates radixin/Nherf2 levels unknown","Single lab","Trafficking versus stability mechanism not separated"]},{"year":2017,"claim":"Demonstrated a tissue-specific trafficking role, showing LRBA promotes Golf heterotrimeric G-protein localization to olfactory cilia and olfactory function.","evidence":"LRBA knockout mice with electro-olfactogram recordings, cilia-fraction immunoblot for Golf subunits, and behavioral assays","pmids":["28814779"],"confidence":"Medium","gaps":["Mechanism of Golf delivery to cilia not defined","Direct interaction with Golf subunits not shown","Single lab"]},{"year":2019,"claim":"Established LRBA as a negative regulator of endosomal TLR signaling, broadening its endosomal role to innate immunity.","evidence":"ENU screen, Lrba knockout mice, Unc93b1 epistasis rescue, TLR stimulation, and DSS colitis model","pmids":["31097594"],"confidence":"High","gaps":["Molecular target of LRBA within the endosomal TLR pathway unknown","Link to CTLA-4 trafficking mechanism unclear"]},{"year":2021,"claim":"Placed LRBA mechanistically upstream of Rab11, showing it delivers internalized CTLA-4 to Rab11+ recycling compartments rather than acting through Rab11 itself.","evidence":"Dominant-negative/constitutively active Rab mutants, LRBA knockout/knockdown in HeLa and Jurkat cells, surface CTLA-4 and colocalization assays","pmids":["33960403"],"confidence":"High","gaps":["How LRBA hands cargo to Rab11 compartments not defined","Direct adaptor partners in the recycling step unidentified"]},{"year":null,"claim":"How the conserved PH-BEACH module recognizes and selects diverse cargoes (CTLA-4, Golf, TLR machinery, stereocilia adaptors) and what direct molecular partners mediate sorting into recycling versus lysosomal fates remain unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No direct LRBA-cargo binding interface mapped for any substrate","Adaptor/effector machinery linking LRBA to Rab11 unknown","Whether the multiple tissue phenotypes share one molecular mechanism unestablished"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,1]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[1,8]}],"localization":[{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[0,1,4]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[0,1]},{"term_id":"GO:0005929","term_label":"cilium","supporting_discovery_ids":[8]}],"pathway":[{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[0,5,6]},{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[0,1,4]},{"term_id":"R-HSA-9609507","term_label":"Protein localization","supporting_discovery_ids":[1,8]}],"complexes":[],"partners":["CTLA4","RDX","NHERF2","GNAL"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P50851","full_name":"Lipopolysaccharide-responsive and beige-like anchor protein","aliases":["Beige-like protein","CDC4-like protein"],"length_aa":2863,"mass_kda":319.1,"function":"Involved in coupling signal transduction and vesicle trafficking to enable polarized secretion and/or membrane deposition of immune effector molecules (By similarity). Involved in phagophore growth during mitophagy by regulating ATG9A trafficking to mitochondria (PubMed:33773106)","subcellular_location":"Cell membrane; Endoplasmic reticulum membrane; Golgi apparatus, trans-Golgi network membrane; Lysosome membrane","url":"https://www.uniprot.org/uniprotkb/P50851/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/LRBA","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/LRBA","total_profiled":1310},"omim":[{"mim_id":"614700","title":"IMMUNODEFICIENCY, COMMON VARIABLE, 8, WITH AUTOIMMUNITY; CVID8","url":"https://www.omim.org/entry/614700"},{"mim_id":"614169","title":"NEUROBEACHIN-LIKE 2; NBEAL2","url":"https://www.omim.org/entry/614169"},{"mim_id":"607594","title":"IMMUNODEFICIENCY, COMMON VARIABLE, 1; CVID1","url":"https://www.omim.org/entry/607594"},{"mim_id":"606453","title":"LIPOPOLYSACCHARIDE-RESPONSIVE, BEIGE-LIKE ANCHOR PROTEIN; LRBA","url":"https://www.omim.org/entry/606453"},{"mim_id":"123890","title":"CYTOTOXIC T LYMPHOCYTE-ASSOCIATED 4; CTLA4","url":"https://www.omim.org/entry/123890"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Golgi apparatus","reliability":"Supported"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/LRBA"},"hgnc":{"alias_symbol":["BGL","LAB300","LBA","uc.147"],"prev_symbol":["CDC4L"]},"alphafold":{"accession":"P50851","domains":[],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P50851","model_url":"","pae_url":"","plddt_mean":null},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=LRBA","jax_strain_url":"https://www.jax.org/strain/search?query=LRBA"},"sequence":{"accession":"P50851","fasta_url":"https://rest.uniprot.org/uniprotkb/P50851.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P50851/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P50851"}},"corpus_meta":[{"pmid":"26206937","id":"PMC_26206937","title":"AUTOIMMUNE DISEASE. 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turnover via lysosomal degradation, resulting in reduced CTLA4 protein levels in FoxP3+ regulatory T cells and activated conventional T cells. Inhibition of lysosomal degradation with chloroquine prevented CTLA4 loss in LRBA-deficient cells.\",\n      \"method\": \"Subcellular colocalization imaging, knockdown experiments, chloroquine rescue assay, flow cytometry for CTLA4 protein levels\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal colocalization, functional rescue with chloroquine, KD with defined molecular phenotype; replicated across multiple cell types and subsequently confirmed by independent labs\",\n      \"pmids\": [\"26206937\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"LRBA is required for effective CTLA-4 recycling by delivering CTLA-4 to Rab11+ recycling compartments. In LRBA-deficient Jurkat cells, CTLA-4 recycling is markedly impaired and CTLA-4 undergoes increased lysosomal degradation. LRBA deficiency reduces CTLA-4 colocalization with Rab11, placing LRBA upstream of Rab11 in the recycling pathway. Constitutively active Rab11 could not rescue CTLA-4 recycling in LRBA-deficient cells.\",\n      \"method\": \"Dominant-negative and constitutively active Rab GTPase expression, LRBA knockdown/knockout in HeLa and Jurkat cells, surface CTLA-4 expression assay, colocalization microscopy\",\n      \"journal\": \"Immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (DN/CA Rab mutants, KO, colocalization), single lab, functionally validated pathway placement\",\n      \"pmids\": [\"33960403\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Crystal structure of the PH-BEACH domain of human LRBA/BGL at 2.4 Å resolution shows the PH domain has canonical PH-domain backbone fold but cannot bind phospholipids. The BEACH domain contains a core of partially extended peptide segments flanked by helices. The PH and BEACH domains associate intimately, and surface plasmon resonance (using FAN as a model) confirmed high-affinity PH-BEACH interaction (Kd ~120 nM).\",\n      \"method\": \"X-ray crystallography, surface plasmon resonance binding assay\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure with SPR validation; two orthogonal methods in one study\",\n      \"pmids\": [\"15554694\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"LRBA deficiency in C57BL/6 mice (CRISPR/Cas9 knockout) causes a cell-autonomous reduction in CTLA-4 accumulation within CD4+ effector T cells and FOXP3+ Tregs. In young mice or chimeric mice where only half of T cells are LRBA-deficient, low CTLA-4 was the only detectable Treg abnormality.\",\n      \"method\": \"CRISPR/Cas9 gene targeting, bone marrow chimeras, flow cytometry for CTLA-4 and FOXP3\",\n      \"journal\": \"Immunology and cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean KO with defined cellular phenotype, chimeric rescue experiment establishing cell-autonomy\",\n      \"pmids\": [\"28611475\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"SEL-2, the C. elegans homolog of LRBA/neurobeachin, is a negative regulator of LIN-12/Notch activity in vulval precursor cells. Loss of sel-2 causes basolateral mislocalization and increased accumulation of LIN-12, impairs downregulation of basolateral LET-23/EGFR, and leads to aberrant FM4-64 lipophilic dye accumulation in intestinal epithelium when presented basolaterally — indicating SEL-2/LRBA is involved in endosomal trafficking and efficient delivery of cell-surface proteins to the lysosome.\",\n      \"method\": \"C. elegans genetics (loss-of-function), fluorescence microscopy, lipophilic dye uptake assay\",\n      \"journal\": \"Development\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean loss-of-function in ortholog with defined trafficking phenotype, two orthogonal readouts; ortholog study, not direct human/mouse data\",\n      \"pmids\": [\"17215302\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"In LRBA-deficient mice, dendritic cells exhibit excessive IRF3/7- and PI3K/mTORC1-dependent signaling and type I IFN production in response to endosomal TLR3, TLR7, and TLR9 stimulation. Knockout of Unc93b1 (required for TLR3/7/9 trafficking to endosomes) substantially reduced cytokine expression and DSS-colitis sensitivity in LRBA-deficient mice, placing LRBA as a negative regulator of endosomal TLR signaling.\",\n      \"method\": \"ENU forward genetic screen, Lrba knockout mice, Unc93b1 double-knockout epistasis, cytokine measurement by ELISA/RNA, DSS colitis model\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis (Unc93b1 knockout rescue), in vitro TLR stimulation assays, in vivo colitis model; multiple orthogonal methods\",\n      \"pmids\": [\"31097594\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"LRBA deficiency leads to impaired CTLA4-mediated suppression of follicular helper T (TFH) cell differentiation. LRBA-sufficient but not LRBA-deficient regulatory T cells suppressed in vitro TFH cell differentiation in a CTLA4-dependent manner. LRBA-deficient TFH cells supported in vitro antibody production by naive B cells.\",\n      \"method\": \"In vitro TFH differentiation assay, Treg suppression co-culture assay, B cell–TFH co-culture immunoglobulin production assay\",\n      \"journal\": \"The Journal of allergy and clinical immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional in vitro assays with defined cellular readouts, single lab, two orthogonal assays\",\n      \"pmids\": [\"28601686\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"LRBA is required for maintenance of cochlear hair cell stereociliary bundles and hearing. LRBA knockout mice show progressive sensorineural hearing loss with partial degeneration of inner and outer hair cell stereocilia during the second postnatal week. LRBA deficiency is associated with reduced abundance of radixin and Nherf2 (adaptor proteins critical for stereocilia mechanical stability) at the basal taper region of stereocilia.\",\n      \"method\": \"LRBA knockout mouse model, auditory brainstem response/electrophysiology, scanning electron microscopy of hair bundles, immunofluorescence/Western blot for radixin and Nherf2\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO mouse with defined structural and functional phenotype, multiple readouts; single lab\",\n      \"pmids\": [\"28893864\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"LRBA promotes the localization of the heterotrimeric G-protein Golf (αolf, β1, γ13 subunits) to olfactory cilia. LRBA-KO mice show markedly reduced levels (20–40% of wild-type) of all three Golf subunits in olfactory cilia, impaired olfactory electro-olfactogram responses, and smaller olfactory bulbs, without gross defects in cilia morphology or most other cilia proteins.\",\n      \"method\": \"LRBA knockout mice, electro-olfactogram recordings, immunofluorescence/Western blot for Golf subunits in cilia fractions, food-finding behavioral assay\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO mouse with defined subcellular localization phenotype, functional electrophysiology and behavior, multiple orthogonal methods; single lab\",\n      \"pmids\": [\"28814779\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"LRBA expression is regulated by p53 (repressor) and E2F1 (activator) at the promoter level. Inhibition of LRBA by RNA interference or a dominant-negative mutant causes significant growth inhibition of cancer cells. The dominant-negative LRBA mutant affects EGFR phosphorylation, suggesting LRBA functions in the mammalian EGFR pathway.\",\n      \"method\": \"Microarray and real-time PCR for expression, promoter reporter assay (p53/E2F1), RNAi knockdown with cell proliferation assay, dominant-negative overexpression with EGFR phosphorylation assay\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — loss-of-function with phenotypic readout, dominant-negative functional assay; single lab, mechanistic pathway placement indirect\",\n      \"pmids\": [\"15064745\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Using lysosomal-blocking compounds (e.g., chloroquine), LRBA mutations can be functionally distinguished from direct CTLA-4 mutations: blocking lysosomal degradation rescues surface CTLA-4 in LRBA-deficient but not in CTLA-4-deficient cells, indicating the functional defect in LRBA deficiency is specifically at the trafficking/degradation step.\",\n      \"method\": \"Flow cytometry for CTLA-4 levels with and without lysosomal inhibitors, stimulation assays on primary T cells from patients\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological rescue experiment on patient primary cells, single lab, two orthogonal assays\",\n      \"pmids\": [\"28159733\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Homozygous loss-of-function mutations in LRBA abolish LRBA protein expression and result in defective in vitro B cell activation, plasmablast formation, immunoglobulin secretion, and reduced autophagy, establishing LRBA as required for normal B cell activation and autophagy.\",\n      \"method\": \"Genetic linkage analysis, gene sequencing, Western blot (protein absence), in vitro B cell activation and proliferation assays, autophagy assays\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — patient loss-of-function with defined in vitro B cell functional readouts, single lab\",\n      \"pmids\": [\"22608502\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"CDC4L (an alias for LRBA) was identified as a novel human gene with homology to yeast CDC4, driven by an endogenous RTVL-H long terminal repeat, establishing it as a cellular gene with a ~862 bp open reading frame expressed in teratocarcinoma cells.\",\n      \"method\": \"Differential screening of cDNA library, sequencing, structural analysis of open reading frames\",\n      \"journal\": \"Genomics\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — identification/cloning only, no functional mechanistic experiment on the protein\",\n      \"pmids\": [\"1505956\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"LRBA is a BEACH domain-containing endosomal trafficking protein that protects CTLA-4 from lysosomal degradation by recycling internalized CTLA-4 through Rab11+ compartments back to the cell surface; its loss leads to reduced CTLA-4 expression on regulatory T cells, exaggerated TFH responses and autoimmunity, while LRBA also limits endosomal TLR signaling in dendritic cells, promotes Golf G-protein localization to olfactory cilia, and maintains cochlear hair cell stereocilia integrity through regulation of radixin and Nherf2 abundance.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"LRBA is a BEACH domain-containing endosomal trafficking regulator that controls the surface availability of internalized membrane receptors, most prominently the immune checkpoint receptor CTLA-4 [#0, #1]. LRBA colocalizes with CTLA-4 in endosomal vesicles and protects it from lysosomal degradation: loss of LRBA accelerates CTLA-4 turnover and lowers CTLA-4 protein in FOXP3+ regulatory and activated conventional T cells, a defect reversed by blocking lysosomal degradation with chloroquine [#0, #10]. Mechanistically, LRBA acts upstream of Rab11 by delivering internalized CTLA-4 to Rab11+ recycling compartments for return to the cell surface; constitutively active Rab11 cannot bypass LRBA loss [#1]. This trafficking function is cell-autonomous in T cells [#3] and underlies an immune-regulatory role, as LRBA-dependent CTLA-4 enables Tregs to suppress follicular helper T cell differentiation and limit B cell antibody production [#6], while LRBA deficiency impairs B cell activation and autophagy [#11]. Beyond CTLA-4, LRBA negatively regulates endosomal TLR3/7/9 signaling in dendritic cells, restraining IRF3/7- and PI3K/mTORC1-dependent type I IFN production [#5], and supports the localization of select membrane-associated proteins in sensory tissues: it promotes Golf G-protein delivery to olfactory cilia [#8] and maintains cochlear hair cell stereocilia by sustaining radixin and Nherf2 abundance [#7]. Structurally, its tandem PH-BEACH module forms an intimate, high-affinity intramolecular unit, though the PH domain does not bind phospholipids [#2].\",\n  \"teleology\": [\n    {\n      \"year\": 1992,\n      \"claim\": \"Established the existence of the gene as a distinct human transcript, providing the molecular entity later characterized functionally.\",\n      \"evidence\": \"Differential cDNA library screening and sequencing in teratocarcinoma cells\",\n      \"pmids\": [\"1505956\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Identification/cloning only with no functional assay\", \"No protein-level or mechanistic characterization\", \"Relationship to trafficking function unestablished\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Resolved the architecture of the signature PH-BEACH module, showing the PH and BEACH domains form a tightly associated unit but the PH domain is not a canonical phospholipid sensor.\",\n      \"evidence\": \"X-ray crystallography at 2.4 Å with SPR binding validation using FAN as a model\",\n      \"pmids\": [\"15554694\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Function of the BEACH domain in trafficking not defined\", \"No structure of full-length protein or substrate-bound state\", \"Does not explain how the module engages cargo\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"First functional placement of LRBA in a receptor-handling pathway, linking it to cell proliferation and EGFR signaling under p53/E2F1 transcriptional control.\",\n      \"evidence\": \"Promoter reporter assays, RNAi knockdown with proliferation readout, and dominant-negative EGFR phosphorylation assay in cancer cells\",\n      \"pmids\": [\"15064745\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"EGFR pathway connection is indirect\", \"Mechanism linking LRBA to EGFR phosphorylation unresolved\", \"Single lab, no in vivo confirmation\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Demonstrated through an ortholog that the LRBA family functions in endosomal trafficking and lysosomal delivery of cell-surface proteins, foreshadowing the human receptor-recycling role.\",\n      \"evidence\": \"C. elegans sel-2 loss-of-function genetics, fluorescence microscopy, and lipophilic dye uptake assays\",\n      \"pmids\": [\"17215302\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Ortholog study, not direct human/mouse data\", \"Notch/EGFR substrate specificity may not transfer to mammals\", \"Molecular step within trafficking not defined\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Established loss-of-function LRBA mutations as causative of a human immune phenotype, tying the gene to B cell activation and autophagy.\",\n      \"evidence\": \"Genetic linkage, sequencing, Western blot for protein absence, and in vitro B cell activation/autophagy assays from patients\",\n      \"pmids\": [\"22608502\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular basis of the autophagy defect not defined\", \"Did not yet identify CTLA-4 as the key target\", \"Single-lab patient cohort\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Identified CTLA-4 as a key LRBA cargo and defined the mechanism: LRBA protects internalized CTLA-4 from lysosomal degradation, explaining low CTLA-4 in LRBA deficiency.\",\n      \"evidence\": \"Endosomal colocalization imaging, knockdown, chloroquine rescue, and flow cytometry across T cell subsets\",\n      \"pmids\": [\"26206937\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define which recycling compartment LRBA routes CTLA-4 through\", \"Direct LRBA–CTLA-4 binding interface not mapped\", \"Mechanism of cargo selection unknown\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Showed the CTLA-4 defect is cell-autonomous in T cells and is the earliest detectable Treg abnormality, isolating the primary lesion from downstream immune dysregulation.\",\n      \"evidence\": \"CRISPR/Cas9 knockout mice and bone marrow chimeras with flow cytometry\",\n      \"pmids\": [\"28611475\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not address LRBA functions outside T cells\", \"Trafficking step not dissected in vivo\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Connected the molecular CTLA-4 defect to immune-regulatory consequences, showing LRBA-dependent CTLA-4 enables Treg suppression of TFH differentiation and antibody production.\",\n      \"evidence\": \"In vitro TFH differentiation, Treg suppression co-culture, and B cell–TFH immunoglobulin assays\",\n      \"pmids\": [\"28601686\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vitro assays only\", \"Single lab\", \"Quantitative contribution of TFH dysregulation to disease unresolved\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Provided a clinical functional test distinguishing LRBA from CTLA-4 defects, confirming the LRBA lesion lies at the trafficking/degradation step.\",\n      \"evidence\": \"Flow cytometry for surface CTLA-4 with and without lysosomal inhibitors on patient primary T cells\",\n      \"pmids\": [\"28159733\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab patient cohort\", \"Does not resolve the molecular trafficking machinery\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Extended LRBA function beyond immunity, showing it maintains cochlear hair cell stereocilia by sustaining radixin and Nherf2 abundance.\",\n      \"evidence\": \"LRBA knockout mice with ABR electrophysiology, scanning electron microscopy, and immunoblot for radixin/Nherf2\",\n      \"pmids\": [\"28893864\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which LRBA regulates radixin/Nherf2 levels unknown\", \"Single lab\", \"Trafficking versus stability mechanism not separated\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Demonstrated a tissue-specific trafficking role, showing LRBA promotes Golf heterotrimeric G-protein localization to olfactory cilia and olfactory function.\",\n      \"evidence\": \"LRBA knockout mice with electro-olfactogram recordings, cilia-fraction immunoblot for Golf subunits, and behavioral assays\",\n      \"pmids\": [\"28814779\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of Golf delivery to cilia not defined\", \"Direct interaction with Golf subunits not shown\", \"Single lab\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Established LRBA as a negative regulator of endosomal TLR signaling, broadening its endosomal role to innate immunity.\",\n      \"evidence\": \"ENU screen, Lrba knockout mice, Unc93b1 epistasis rescue, TLR stimulation, and DSS colitis model\",\n      \"pmids\": [\"31097594\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular target of LRBA within the endosomal TLR pathway unknown\", \"Link to CTLA-4 trafficking mechanism unclear\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Placed LRBA mechanistically upstream of Rab11, showing it delivers internalized CTLA-4 to Rab11+ recycling compartments rather than acting through Rab11 itself.\",\n      \"evidence\": \"Dominant-negative/constitutively active Rab mutants, LRBA knockout/knockdown in HeLa and Jurkat cells, surface CTLA-4 and colocalization assays\",\n      \"pmids\": [\"33960403\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How LRBA hands cargo to Rab11 compartments not defined\", \"Direct adaptor partners in the recycling step unidentified\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the conserved PH-BEACH module recognizes and selects diverse cargoes (CTLA-4, Golf, TLR machinery, stereocilia adaptors) and what direct molecular partners mediate sorting into recycling versus lysosomal fates remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No direct LRBA-cargo binding interface mapped for any substrate\", \"Adaptor/effector machinery linking LRBA to Rab11 unknown\", \"Whether the multiple tissue phenotypes share one molecular mechanism unestablished\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [1, 8]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [0, 1, 4]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [8]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [0, 5, 6]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [0, 1, 4]},\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [1, 8]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"CTLA4\", \"RDX\", \"NHERF2\", \"GNAL\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}