{"gene":"CCDC88B","run_date":"2026-06-09T22:57:17","timeline":{"discoveries":[{"year":2015,"finding":"HkRP3 (CCDC88B) is a microtubule-binding protein present in lytic granule fractions of NK cells. It interacts with the dynein motor complex and microtubules (MT), and also binds DOCK8. Depletion of HkRP3 impaired NK cell cytotoxicity by causing defects in both MTOC polarization and clustering of lytic granules around the MTOC.","method":"Subcellular fractionation, co-immunoprecipitation (DOCK8, dynein complex, MTs), siRNA knockdown with cytotoxicity and MTOC polarization assays","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal binding assays, fractionation, and KD with multiple defined phenotypic readouts in a single focused study","pmids":["25762780"],"is_preprint":false},{"year":2014,"finding":"CCDC88B is expressed abundantly in immune cells (CD4+, CD8+ T cells, myeloid cells) and is specifically expressed in spleen, bone marrow, lymph nodes, and thymus. Loss of CCDC88B impairs T lymphocyte maturation in vivo, reduces activation and cell division, and impairs cytokine production (IFN-γ and TNF) in response to TCR engagement or non-specific stimuli, establishing CCDC88B as a regulator of T cell function.","method":"Genome-wide ENU mutagenesis screen, loss-of-function mouse model, flow cytometry, in vitro T cell stimulation assays, P. berghei infection model","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (in vivo and in vitro), loss-of-function with defined cellular phenotypes across multiple T cell functional readouts","pmids":["25403443"],"is_preprint":false},{"year":2011,"finding":"Gipie (CCDC88B) is expressed in endothelial cells and interacts with GRP78 (master regulator of the UPR) at the ER. This interaction stabilizes the GRP78-IRE1 complex, leading to attenuation of IRE1-induced JNK activation, thereby suppressing ER stress-induced apoptosis. Gipie expression is induced by ER stress.","method":"Co-immunoprecipitation, siRNA knockdown, phospho-JNK assays, apoptosis assays, immunofluorescence localization, rat carotid balloon injury model","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 / Moderate — co-IP identifying GRP78 and IRE1 as binding partners, KD with JNK phosphorylation and apoptosis readouts, confirmed in vivo in vascular injury model","pmids":["21289099"],"is_preprint":false},{"year":2017,"finding":"CCDC88B is required for T cell-mediated pathogenesis of inflammatory bowel disease. In a T cell transfer model of colitis, Ccdc88b-mutant CD4+ T cells fail to induce colitis in immunocompromised hosts. Loss of Ccdc88b also protects against DSS-induced colitis with reduced intestinal inflammation.","method":"T cell transfer colitis model, DSS-induced colitis model, Ccdc88b-deficient mice, histopathology, flow cytometry","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — two independent mouse models of colitis with genetic loss-of-function, cell-transfer experiment placing CCDC88B function specifically in T cells","pmids":["29030607"],"is_preprint":false},{"year":2020,"finding":"CCDC88B is required for dendritic cell (DC) migration and motility. Ccdc88b-mutant DCs fail to migrate to draining lymph nodes in response to LPS in vivo, and show an intrinsic motility defect in vitro by time-lapse microscopy. OVA-pulsed Ccdc88b-mutant DCs injected in vivo fail to induce antigen-specific T cell activation, attributable to the migratory defect rather than antigen presentation capacity.","method":"In vivo DC recruitment assays (LPS), OVA-DC immunization, time-lapse light microscopy, contact hypersensitivity model, flow cytometry, Ccdc88b-mutant mice","journal":"Journal of leukocyte biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple in vivo and in vitro assays with direct visualization of motility defect; antigen presentation ruled out as mechanism, isolating migration as the functional defect","pmids":["32480428"],"is_preprint":false},{"year":2024,"finding":"CCDC88B physically and functionally interacts with ARHGEF2 (RhoGEF) and RASAL3 (RasGAP). The CCDC88B/RASAL3/ARHGEF2 complex regulates DC migration by modulating RHOA activation, with ARHGEF2 and RASAL3 acting in opposing fashions. Mice defective in Arhgef2 or Rasal3 show dampened neuroinflammation and altered susceptibility to colitis.","method":"Co-immunoprecipitation, affinity purification/mass spectrometry, DC migration assays in vitro, Arhgef2 and Rasal3 mutant mouse models, RHOA activation assays","journal":"Communications biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — AP-MS and Co-IP identifying binding partners, RHOA activation as molecular readout, validated in multiple mutant mouse models in vivo","pmids":["38200184"],"is_preprint":false},{"year":2015,"finding":"Gipie (CCDC88B) participates in the ER stress response in vascular smooth muscle cells (VSMCs). Gipie knockdown increases phosphorylation of JNK and apoptosis under ER stress, and decreases mature collagen I in synthetic VSMCs. In vivo, Gipie depletion in rat carotid artery attenuates neointimal thickening with increased cell death, while Gipie overexpression augments neointimal thickening.","method":"siRNA knockdown, thapsigargin ER stress induction, phospho-JNK assay, apoptosis assay, collagen I Western blot, rat carotid balloon injury model with adenoviral overexpression/RNAi","journal":"Arteriosclerosis, thrombosis, and vascular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro KD with biochemical readouts and in vivo gain/loss of function, but largely extends findings from prior Gipie paper (PMID 21289099)","pmids":["25792451"],"is_preprint":false},{"year":2006,"finding":"The CCDC88B paralog family (including the uncharacterized FLJ00354/HkRP3 protein, an alias for CCDC88B) share N-terminal and central coiled-coil domains and a Gα-binding domain. Family members are proposed to form dimers via their central coiled-coil domains. The functional characterization of FLJ00354/CCDC88B specifically was noted as incomplete at this time.","method":"BLAST homology analysis, structural domain annotation, review of published binding data for family members","journal":"Annals of the New York Academy of Sciences","confidence":"Low","confidence_rationale":"Tier 4 / Weak — computational/structural annotation only; no direct experiment on CCDC88B (FLJ00354) itself in this paper","pmids":["17185515"],"is_preprint":false},{"year":2023,"finding":"Silencing of Gipie (CCDC88B) in adenoid cystic carcinoma (ACC) cells in 3D immune co-culture models increased apoptosis ~6-fold, decreased regulatory T cells ~2-fold, and increased activated NK cells ~3-fold with higher granzyme and perforin release, suggesting CCDC88B in ACC cells suppresses anti-tumor immune reactivity.","method":"siRNA silencing of Gipie in 3D co-culture models, flow cytometry (annexin V, FoxP3+/CD25+ Tregs, NKp30+/IFN-γ+ NK cells), granzyme/perforin release assays","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 3 / Weak — single lab, siRNA knockdown with multiple flow cytometry readouts but in a specialized tumor-immune co-culture system; no molecular mechanism identified","pmids":["37813936"],"is_preprint":false},{"year":2015,"finding":"Drosophila Girdin (the single HkRP family member, ortholog of CCDC88B/Gipie/HkRP3 family) is expressed transiently in actin-based structures surrounding the inner segment tip and sensory cilium during dendrite morphogenesis. Loss of Girdin causes degeneration of ciliated dendrites in mechanosensory neurons and defects in sensory organs mediating olfaction and taste, establishing a role in actin organization required for sensory dendrite formation.","method":"Forward genetic screen, Drosophila mutant analysis, physiological recording, confocal morphological and ultrastructural (electron microscopy) analysis, immunostaining for actin structures","journal":"Genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function genetics with ultrastructural validation and multiple sensory organ phenotypes, but in Drosophila ortholog (not mammalian CCDC88B directly)","pmids":["26058848"],"is_preprint":false}],"current_model":"CCDC88B (also known as HkRP3/Gipie) is a cytoskeleton-associated scaffold protein that regulates immune cell migration and effector functions: it binds microtubules, dynein, and DOCK8 to coordinate lytic granule clustering and MTOC polarization in NK cells; it interacts with ARHGEF2 and RASAL3 to modulate RHOA-dependent dendritic cell migration; it controls T cell activation, proliferation, and cytokine production downstream of TCR engagement; and in endothelial and vascular smooth muscle cells it interacts with GRP78 to stabilize the GRP78-IRE1 complex at the ER, attenuating IRE1-JNK signaling and protecting against ER stress-induced apoptosis."},"narrative":{"mechanistic_narrative":"CCDC88B (HkRP3/Gipie) is a cytoskeleton-associated scaffold protein that governs immune cell migration and effector function while also modulating the ER stress response [PMID:25762780, PMID:25403443, PMID:21289099]. In NK cells it binds microtubules, the dynein motor complex, and DOCK8, and its loss disrupts MTOC polarization and clustering of lytic granules, impairing cytotoxicity [PMID:25762780]. Genetic loss-of-function in mice establishes CCDC88B as a regulator of T cell maturation, activation, proliferation, and cytokine production downstream of TCR engagement [PMID:25403443], and as a T cell-intrinsic driver of inflammatory colitis [PMID:29030607]. In dendritic cells, CCDC88B is required for cell-intrinsic motility and migration to draining lymph nodes [PMID:32480428], acting through a complex with the RhoGEF ARHGEF2 and the RasGAP RASAL3 that controls RHOA activation, with the two partners exerting opposing effects [PMID:38200184]. Separately, in endothelial and vascular smooth muscle cells, CCDC88B (Gipie) interacts with GRP78 to stabilize the GRP78-IRE1 complex at the ER, attenuating IRE1-driven JNK activation and protecting against ER stress-induced apoptosis [PMID:21289099, PMID:25792451].","teleology":[{"year":2011,"claim":"Established the first molecular function for the protein, showing Gipie acts at the ER to buffer the unfolded protein response rather than being an uncharacterized coiled-coil protein.","evidence":"Co-IP, siRNA knockdown, phospho-JNK and apoptosis assays in endothelial cells, plus rat carotid balloon injury model","pmids":["21289099"],"confidence":"High","gaps":["Did not define the domain mediating GRP78 binding","Did not connect ER function to the protein's immune roles"]},{"year":2014,"claim":"Placed CCDC88B in the immune system, demonstrating it is required for T cell maturation, activation, and cytokine output, defining a wholly distinct physiological context from its ER role.","evidence":"ENU mutagenesis screen, loss-of-function mouse model, flow cytometry, in vitro TCR stimulation, P. berghei infection","pmids":["25403443"],"confidence":"High","gaps":["Molecular mechanism linking CCDC88B to TCR signaling not identified","No direct biochemical partners defined in T cells"]},{"year":2015,"claim":"Provided a cytoskeletal mechanism in NK cells, showing the protein bridges microtubules, dynein, and DOCK8 to drive MTOC polarization and lytic granule clustering required for cytotoxicity.","evidence":"Subcellular fractionation, reciprocal Co-IP, siRNA knockdown with cytotoxicity and MTOC polarization assays","pmids":["25762780"],"confidence":"High","gaps":["Did not resolve how the same protein operates at both the ER and the MTOC","Stoichiometry and direct vs indirect nature of dynein/DOCK8 binding not established"]},{"year":2015,"claim":"Extended the ER stress-protective role to vascular smooth muscle cells, linking Gipie to JNK suppression, collagen maturation, and neointimal remodeling in vivo.","evidence":"siRNA knockdown, thapsigargin induction, phospho-JNK and apoptosis assays, rat carotid injury with adenoviral gain/loss of function","pmids":["25792451"],"confidence":"Medium","gaps":["Largely extends the prior endothelial Gipie study without new molecular detail","Mechanistic link from IRE1-JNK to collagen I unresolved"]},{"year":2017,"claim":"Demonstrated disease relevance by showing CCDC88B acts cell-intrinsically in CD4+ T cells to drive colitis, converting a cellular phenotype into a pathogenic axis.","evidence":"T cell transfer and DSS colitis models in Ccdc88b-deficient mice, histopathology, flow cytometry","pmids":["29030607"],"confidence":"High","gaps":["Did not identify the signaling node within T cells responsible","Whether effect is migration-driven or activation-driven not dissected here"]},{"year":2020,"claim":"Isolated migration as a core function by showing Ccdc88b-mutant dendritic cells have an intrinsic motility defect that prevents lymph node homing, independent of antigen presentation.","evidence":"In vivo LPS recruitment and OVA-DC immunization, time-lapse microscopy, contact hypersensitivity model in mutant mice","pmids":["32480428"],"confidence":"High","gaps":["Molecular driver of the motility defect not yet identified at this stage","Cytoskeletal mechanism in DCs not directly visualized"]},{"year":2024,"claim":"Provided the molecular machinery for DC migration, identifying a CCDC88B/ARHGEF2/RASAL3 complex that tunes RHOA activity with opposing GEF and GAP arms.","evidence":"AP-MS and Co-IP, in vitro DC migration and RHOA activation assays, Arhgef2 and Rasal3 mutant mouse models","pmids":["38200184"],"confidence":"High","gaps":["How CCDC88B coordinates opposing ARHGEF2/RASAL3 activities mechanistically unclear","Spatial/temporal regulation of RHOA at the migrating cell front not resolved"]},{"year":2023,"claim":"Implicated CCDC88B in tumor cell-mediated immune suppression, showing its silencing in adenoid cystic carcinoma cells unleashes NK and reduces regulatory T cell activity.","evidence":"siRNA silencing in 3D immune co-culture, flow cytometry for apoptosis, Tregs, and activated NK cells, granzyme/perforin assays","pmids":["37813936"],"confidence":"Medium","gaps":["No molecular mechanism identified in the tumor context","Single specialized co-culture system without in vivo validation"]},{"year":null,"claim":"It remains unknown how a single scaffold reconciles its ER stress-buffering function with its cytoskeletal/RHOA-dependent roles in immune cell migration and effector function.","evidence":"No discovery in the corpus unifies the ER and cytoskeletal mechanisms","pmids":[],"confidence":"Low","gaps":["No structural model mapping domains to GRP78 vs dynein/DOCK8 vs ARHGEF2/RASAL3 binding","No demonstration of dimerization function in mammalian cells","Context-dependent partner switching mechanism uncharacterized"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[0]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,5]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[2,5,6]}],"localization":[{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[0]},{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[0]},{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[2,6]}],"pathway":[{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[0,1,3,4,5]},{"term_id":"R-HSA-8953897","term_label":"Cellular responses to stimuli","supporting_discovery_ids":[2,6]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[2,6]}],"complexes":["CCDC88B/ARHGEF2/RASAL3 complex","GRP78-IRE1 complex"],"partners":["DOCK8","GRP78","IRE1","ARHGEF2","RASAL3"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"A6NC98","full_name":"Coiled-coil domain-containing protein 88B","aliases":["Brain leucine zipper domain-containing protein","Gipie","Hook-related protein 3","HkRP3"],"length_aa":1476,"mass_kda":164.8,"function":"Acts as a positive regulator of T-cell maturation and inflammatory function. Required for several functions of T-cells, in both the CD4(+) and the CD8(+) compartments and this includes expression of cell surface markers of activation, proliferation, and cytokine production in response to specific or non-specific stimulation (By similarity). Enhances NK cell cytotoxicity by positively regulating polarization of microtubule-organizing center (MTOC) to cytotoxic synapse, lytic granule transport along microtubules, and dynein-mediated clustering to MTOC (PubMed:25762780). Interacts with HSPA5 and stabilizes the interaction between HSPA5 and ERN1, leading to suppression of ERN1-induced JNK activation and endoplasmic reticulum stress-induced apoptosis (PubMed:21289099)","subcellular_location":"Membrane; Cytoplasm, cytoskeleton, microtubule organizing center; Endoplasmic reticulum; Golgi apparatus; Cytoplasm","url":"https://www.uniprot.org/uniprotkb/A6NC98/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CCDC88B","classification":"Not Classified","n_dependent_lines":69,"n_total_lines":1208,"dependency_fraction":0.057119205298013245},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/CCDC88B","total_profiled":1310},"omim":[{"mim_id":"611205","title":"COILED-COIL DOMAIN-CONTAINING PROTEIN 88B; CCDC88B","url":"https://www.omim.org/entry/611205"},{"mim_id":"609736","title":"COILED-COIL DOMAIN-CONTAINING PROTEIN 88A; CCDC88A","url":"https://www.omim.org/entry/609736"},{"mim_id":"606921","title":"G PROTEIN-COUPLED RECEPTOR 78; GPR78","url":"https://www.omim.org/entry/606921"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Centrosome","reliability":"Supported"},{"location":"Cytosol","reliability":"Supported"},{"location":"Nucleoplasm","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"brain","ntpm":85.3},{"tissue":"lymphoid tissue","ntpm":84.4}],"url":"https://www.proteinatlas.org/search/CCDC88B"},"hgnc":{"alias_symbol":["FLJ37970","BRLZ","HkRP3","FLJ00354","GIPIE"],"prev_symbol":["CCDC88"]},"alphafold":{"accession":"A6NC98","domains":[{"cath_id":"1.10.418.10","chopping":"9-27_48-190","consensus_level":"high","plddt":83.6707,"start":9,"end":190}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/A6NC98","model_url":"https://alphafold.ebi.ac.uk/files/AF-A6NC98-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-A6NC98-F1-predicted_aligned_error_v6.png","plddt_mean":69.06},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CCDC88B","jax_strain_url":"https://www.jax.org/strain/search?query=CCDC88B"},"sequence":{"accession":"A6NC98","fasta_url":"https://rest.uniprot.org/uniprotkb/A6NC98.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/A6NC98/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/A6NC98"}},"corpus_meta":[{"pmid":"15749703","id":"PMC_15749703","title":"Identification 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reports","url":"https://pubmed.ncbi.nlm.nih.gov/32934312","citation_count":0,"is_preprint":false},{"pmid":"41646303","id":"PMC_41646303","title":"The Impact of Structural Variation on Alzheimer's Disease in the Alzheimer's Disease Sequencing Project.","date":"2026","source":"Research square","url":"https://pubmed.ncbi.nlm.nih.gov/41646303","citation_count":0,"is_preprint":false},{"pmid":"41466414","id":"PMC_41466414","title":"Genome-wide association for sarcoidosis identifies novel risk loci and genetic heritability in African and European ancestries: a meta-analysis from the Finngen, Million Veteran Program, UK Biobank, and Biobank Japan datasets.","date":"2025","source":"Orphanet journal of rare diseases","url":"https://pubmed.ncbi.nlm.nih.gov/41466414","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":22066,"output_tokens":2919,"usd":0.054991,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":10199,"output_tokens":3100,"usd":0.064247,"stage2_stop_reason":"end_turn"},"total_usd":0.119238,"stage1_batch_id":"msgbatch_01ACAxJQabDsht39JXeWG22d","stage2_batch_id":"msgbatch_01QEU22A9U5sbPTgsMzTmvSf","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2015,\n      \"finding\": \"HkRP3 (CCDC88B) is a microtubule-binding protein present in lytic granule fractions of NK cells. It interacts with the dynein motor complex and microtubules (MT), and also binds DOCK8. Depletion of HkRP3 impaired NK cell cytotoxicity by causing defects in both MTOC polarization and clustering of lytic granules around the MTOC.\",\n      \"method\": \"Subcellular fractionation, co-immunoprecipitation (DOCK8, dynein complex, MTs), siRNA knockdown with cytotoxicity and MTOC polarization assays\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal binding assays, fractionation, and KD with multiple defined phenotypic readouts in a single focused study\",\n      \"pmids\": [\"25762780\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"CCDC88B is expressed abundantly in immune cells (CD4+, CD8+ T cells, myeloid cells) and is specifically expressed in spleen, bone marrow, lymph nodes, and thymus. Loss of CCDC88B impairs T lymphocyte maturation in vivo, reduces activation and cell division, and impairs cytokine production (IFN-γ and TNF) in response to TCR engagement or non-specific stimuli, establishing CCDC88B as a regulator of T cell function.\",\n      \"method\": \"Genome-wide ENU mutagenesis screen, loss-of-function mouse model, flow cytometry, in vitro T cell stimulation assays, P. berghei infection model\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (in vivo and in vitro), loss-of-function with defined cellular phenotypes across multiple T cell functional readouts\",\n      \"pmids\": [\"25403443\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Gipie (CCDC88B) is expressed in endothelial cells and interacts with GRP78 (master regulator of the UPR) at the ER. This interaction stabilizes the GRP78-IRE1 complex, leading to attenuation of IRE1-induced JNK activation, thereby suppressing ER stress-induced apoptosis. Gipie expression is induced by ER stress.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, phospho-JNK assays, apoptosis assays, immunofluorescence localization, rat carotid balloon injury model\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP identifying GRP78 and IRE1 as binding partners, KD with JNK phosphorylation and apoptosis readouts, confirmed in vivo in vascular injury model\",\n      \"pmids\": [\"21289099\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"CCDC88B is required for T cell-mediated pathogenesis of inflammatory bowel disease. In a T cell transfer model of colitis, Ccdc88b-mutant CD4+ T cells fail to induce colitis in immunocompromised hosts. Loss of Ccdc88b also protects against DSS-induced colitis with reduced intestinal inflammation.\",\n      \"method\": \"T cell transfer colitis model, DSS-induced colitis model, Ccdc88b-deficient mice, histopathology, flow cytometry\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — two independent mouse models of colitis with genetic loss-of-function, cell-transfer experiment placing CCDC88B function specifically in T cells\",\n      \"pmids\": [\"29030607\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"CCDC88B is required for dendritic cell (DC) migration and motility. Ccdc88b-mutant DCs fail to migrate to draining lymph nodes in response to LPS in vivo, and show an intrinsic motility defect in vitro by time-lapse microscopy. OVA-pulsed Ccdc88b-mutant DCs injected in vivo fail to induce antigen-specific T cell activation, attributable to the migratory defect rather than antigen presentation capacity.\",\n      \"method\": \"In vivo DC recruitment assays (LPS), OVA-DC immunization, time-lapse light microscopy, contact hypersensitivity model, flow cytometry, Ccdc88b-mutant mice\",\n      \"journal\": \"Journal of leukocyte biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple in vivo and in vitro assays with direct visualization of motility defect; antigen presentation ruled out as mechanism, isolating migration as the functional defect\",\n      \"pmids\": [\"32480428\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"CCDC88B physically and functionally interacts with ARHGEF2 (RhoGEF) and RASAL3 (RasGAP). The CCDC88B/RASAL3/ARHGEF2 complex regulates DC migration by modulating RHOA activation, with ARHGEF2 and RASAL3 acting in opposing fashions. Mice defective in Arhgef2 or Rasal3 show dampened neuroinflammation and altered susceptibility to colitis.\",\n      \"method\": \"Co-immunoprecipitation, affinity purification/mass spectrometry, DC migration assays in vitro, Arhgef2 and Rasal3 mutant mouse models, RHOA activation assays\",\n      \"journal\": \"Communications biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — AP-MS and Co-IP identifying binding partners, RHOA activation as molecular readout, validated in multiple mutant mouse models in vivo\",\n      \"pmids\": [\"38200184\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Gipie (CCDC88B) participates in the ER stress response in vascular smooth muscle cells (VSMCs). Gipie knockdown increases phosphorylation of JNK and apoptosis under ER stress, and decreases mature collagen I in synthetic VSMCs. In vivo, Gipie depletion in rat carotid artery attenuates neointimal thickening with increased cell death, while Gipie overexpression augments neointimal thickening.\",\n      \"method\": \"siRNA knockdown, thapsigargin ER stress induction, phospho-JNK assay, apoptosis assay, collagen I Western blot, rat carotid balloon injury model with adenoviral overexpression/RNAi\",\n      \"journal\": \"Arteriosclerosis, thrombosis, and vascular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro KD with biochemical readouts and in vivo gain/loss of function, but largely extends findings from prior Gipie paper (PMID 21289099)\",\n      \"pmids\": [\"25792451\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"The CCDC88B paralog family (including the uncharacterized FLJ00354/HkRP3 protein, an alias for CCDC88B) share N-terminal and central coiled-coil domains and a Gα-binding domain. Family members are proposed to form dimers via their central coiled-coil domains. The functional characterization of FLJ00354/CCDC88B specifically was noted as incomplete at this time.\",\n      \"method\": \"BLAST homology analysis, structural domain annotation, review of published binding data for family members\",\n      \"journal\": \"Annals of the New York Academy of Sciences\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 / Weak — computational/structural annotation only; no direct experiment on CCDC88B (FLJ00354) itself in this paper\",\n      \"pmids\": [\"17185515\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Silencing of Gipie (CCDC88B) in adenoid cystic carcinoma (ACC) cells in 3D immune co-culture models increased apoptosis ~6-fold, decreased regulatory T cells ~2-fold, and increased activated NK cells ~3-fold with higher granzyme and perforin release, suggesting CCDC88B in ACC cells suppresses anti-tumor immune reactivity.\",\n      \"method\": \"siRNA silencing of Gipie in 3D co-culture models, flow cytometry (annexin V, FoxP3+/CD25+ Tregs, NKp30+/IFN-γ+ NK cells), granzyme/perforin release assays\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, siRNA knockdown with multiple flow cytometry readouts but in a specialized tumor-immune co-culture system; no molecular mechanism identified\",\n      \"pmids\": [\"37813936\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Drosophila Girdin (the single HkRP family member, ortholog of CCDC88B/Gipie/HkRP3 family) is expressed transiently in actin-based structures surrounding the inner segment tip and sensory cilium during dendrite morphogenesis. Loss of Girdin causes degeneration of ciliated dendrites in mechanosensory neurons and defects in sensory organs mediating olfaction and taste, establishing a role in actin organization required for sensory dendrite formation.\",\n      \"method\": \"Forward genetic screen, Drosophila mutant analysis, physiological recording, confocal morphological and ultrastructural (electron microscopy) analysis, immunostaining for actin structures\",\n      \"journal\": \"Genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function genetics with ultrastructural validation and multiple sensory organ phenotypes, but in Drosophila ortholog (not mammalian CCDC88B directly)\",\n      \"pmids\": [\"26058848\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CCDC88B (also known as HkRP3/Gipie) is a cytoskeleton-associated scaffold protein that regulates immune cell migration and effector functions: it binds microtubules, dynein, and DOCK8 to coordinate lytic granule clustering and MTOC polarization in NK cells; it interacts with ARHGEF2 and RASAL3 to modulate RHOA-dependent dendritic cell migration; it controls T cell activation, proliferation, and cytokine production downstream of TCR engagement; and in endothelial and vascular smooth muscle cells it interacts with GRP78 to stabilize the GRP78-IRE1 complex at the ER, attenuating IRE1-JNK signaling and protecting against ER stress-induced apoptosis.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CCDC88B (HkRP3/Gipie) is a cytoskeleton-associated scaffold protein that governs immune cell migration and effector function while also modulating the ER stress response [#0, #1, #2]. In NK cells it binds microtubules, the dynein motor complex, and DOCK8, and its loss disrupts MTOC polarization and clustering of lytic granules, impairing cytotoxicity [#0]. Genetic loss-of-function in mice establishes CCDC88B as a regulator of T cell maturation, activation, proliferation, and cytokine production downstream of TCR engagement [#1], and as a T cell-intrinsic driver of inflammatory colitis [#3]. In dendritic cells, CCDC88B is required for cell-intrinsic motility and migration to draining lymph nodes [#4], acting through a complex with the RhoGEF ARHGEF2 and the RasGAP RASAL3 that controls RHOA activation, with the two partners exerting opposing effects [#5]. Separately, in endothelial and vascular smooth muscle cells, CCDC88B (Gipie) interacts with GRP78 to stabilize the GRP78-IRE1 complex at the ER, attenuating IRE1-driven JNK activation and protecting against ER stress-induced apoptosis [#2, #6].\",\n  \"teleology\": [\n    {\n      \"year\": 2011,\n      \"claim\": \"Established the first molecular function for the protein, showing Gipie acts at the ER to buffer the unfolded protein response rather than being an uncharacterized coiled-coil protein.\",\n      \"evidence\": \"Co-IP, siRNA knockdown, phospho-JNK and apoptosis assays in endothelial cells, plus rat carotid balloon injury model\",\n      \"pmids\": [\"21289099\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Did not define the domain mediating GRP78 binding\",\n        \"Did not connect ER function to the protein's immune roles\"\n      ]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Placed CCDC88B in the immune system, demonstrating it is required for T cell maturation, activation, and cytokine output, defining a wholly distinct physiological context from its ER role.\",\n      \"evidence\": \"ENU mutagenesis screen, loss-of-function mouse model, flow cytometry, in vitro TCR stimulation, P. berghei infection\",\n      \"pmids\": [\"25403443\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Molecular mechanism linking CCDC88B to TCR signaling not identified\",\n        \"No direct biochemical partners defined in T cells\"\n      ]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Provided a cytoskeletal mechanism in NK cells, showing the protein bridges microtubules, dynein, and DOCK8 to drive MTOC polarization and lytic granule clustering required for cytotoxicity.\",\n      \"evidence\": \"Subcellular fractionation, reciprocal Co-IP, siRNA knockdown with cytotoxicity and MTOC polarization assays\",\n      \"pmids\": [\"25762780\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Did not resolve how the same protein operates at both the ER and the MTOC\",\n        \"Stoichiometry and direct vs indirect nature of dynein/DOCK8 binding not established\"\n      ]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Extended the ER stress-protective role to vascular smooth muscle cells, linking Gipie to JNK suppression, collagen maturation, and neointimal remodeling in vivo.\",\n      \"evidence\": \"siRNA knockdown, thapsigargin induction, phospho-JNK and apoptosis assays, rat carotid injury with adenoviral gain/loss of function\",\n      \"pmids\": [\"25792451\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Largely extends the prior endothelial Gipie study without new molecular detail\",\n        \"Mechanistic link from IRE1-JNK to collagen I unresolved\"\n      ]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Demonstrated disease relevance by showing CCDC88B acts cell-intrinsically in CD4+ T cells to drive colitis, converting a cellular phenotype into a pathogenic axis.\",\n      \"evidence\": \"T cell transfer and DSS colitis models in Ccdc88b-deficient mice, histopathology, flow cytometry\",\n      \"pmids\": [\"29030607\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Did not identify the signaling node within T cells responsible\",\n        \"Whether effect is migration-driven or activation-driven not dissected here\"\n      ]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Isolated migration as a core function by showing Ccdc88b-mutant dendritic cells have an intrinsic motility defect that prevents lymph node homing, independent of antigen presentation.\",\n      \"evidence\": \"In vivo LPS recruitment and OVA-DC immunization, time-lapse microscopy, contact hypersensitivity model in mutant mice\",\n      \"pmids\": [\"32480428\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Molecular driver of the motility defect not yet identified at this stage\",\n        \"Cytoskeletal mechanism in DCs not directly visualized\"\n      ]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Provided the molecular machinery for DC migration, identifying a CCDC88B/ARHGEF2/RASAL3 complex that tunes RHOA activity with opposing GEF and GAP arms.\",\n      \"evidence\": \"AP-MS and Co-IP, in vitro DC migration and RHOA activation assays, Arhgef2 and Rasal3 mutant mouse models\",\n      \"pmids\": [\"38200184\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"How CCDC88B coordinates opposing ARHGEF2/RASAL3 activities mechanistically unclear\",\n        \"Spatial/temporal regulation of RHOA at the migrating cell front not resolved\"\n      ]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Implicated CCDC88B in tumor cell-mediated immune suppression, showing its silencing in adenoid cystic carcinoma cells unleashes NK and reduces regulatory T cell activity.\",\n      \"evidence\": \"siRNA silencing in 3D immune co-culture, flow cytometry for apoptosis, Tregs, and activated NK cells, granzyme/perforin assays\",\n      \"pmids\": [\"37813936\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No molecular mechanism identified in the tumor context\",\n        \"Single specialized co-culture system without in vivo validation\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unknown how a single scaffold reconciles its ER stress-buffering function with its cytoskeletal/RHOA-dependent roles in immune cell migration and effector function.\",\n      \"evidence\": \"No discovery in the corpus unifies the ER and cytoskeletal mechanisms\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No structural model mapping domains to GRP78 vs dynein/DOCK8 vs ARHGEF2/RASAL3 binding\",\n        \"No demonstration of dimerization function in mammalian cells\",\n        \"Context-dependent partner switching mechanism uncharacterized\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 5]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [2, 5, 6]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [2, 6]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [0, 1, 3, 4, 5]},\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [2, 6]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [2, 6]}\n    ],\n    \"complexes\": [\n      \"CCDC88B/ARHGEF2/RASAL3 complex\",\n      \"GRP78-IRE1 complex\"\n    ],\n    \"partners\": [\n      \"DOCK8\",\n      \"GRP78\",\n      \"IRE1\",\n      \"ARHGEF2\",\n      \"RASAL3\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}