{"gene":"CYTIP","run_date":"2026-06-09T22:57:19","timeline":{"discoveries":[{"year":2002,"finding":"CYTIP (Cybr) physically interacts with cytohesin-1 through coiled-coil domains of both proteins, as demonstrated by co-immunoprecipitation of overexpressed proteins from 293T cells. Cybr enhances cytohesin-1-mediated acceleration of GTPγS binding to ARF GTPases in vitro, identifying CYTIP as a positive regulator of cytohesin-1 guanine nucleotide exchange factor activity.","method":"Co-immunoprecipitation (overexpressed proteins in 293T cells); in vitro ARF GEF activity assay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP plus in vitro GEF assay in single lab; two orthogonal methods but overexpression system","pmids":["11867758"],"is_preprint":false},{"year":2003,"finding":"CYTIP is recruited to the cell cortex via its PDZ domain in response to integrin signaling, and co-expression of CYTIP is strictly required for phorbol-ester-stimulated membrane detachment of cytohesin-1. CYTIP sequesters cytohesin-1 away from the plasma membrane upon stimulation, thereby repressing LFA-1-mediated adhesion of Jurkat cells to ICAM-1. This identifies CYTIP as a signal-complex sequestration protein that attenuates leukocyte adhesion.","method":"Subcellular localization by fluorescence microscopy; overexpression and co-expression functional adhesion assay (Jurkat–ICAM-1); PDZ-domain interaction studies","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct localization experiment tied to functional consequence, adhesion assay with co-expression requirement established mechanistically, replicated across multiple experimental conditions in one rigorous study","pmids":["12606567"],"is_preprint":false},{"year":2005,"finding":"CYTIP is induced during dendritic cell (DC) maturation and transiently accumulates at DC–T-cell contact zones within the first hour of co-culture. Specific siRNA-mediated silencing of CYTIP increases DC adhesion to T cells and to fibronectin, and reduces DC priming capacity when antigen is limiting, demonstrating that CYTIP actively mediates DC–T-cell deattachment to permit dissolution of the immune synapse.","method":"siRNA knockdown in DCs; DC–T-cell co-culture adhesion assay; fibronectin adhesion assay; T-cell priming assay; fluorescence microscopy of contact zones","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Strong — loss-of-function with specific phenotypic readout (adhesion, priming), direct localization with functional consequence, multiple orthogonal assays in one study","pmids":["16204317"],"is_preprint":false},{"year":2006,"finding":"In Cybr (CYTIP)-deficient mice generated by gene knockout, circulating leukocytes in blood and lymphocytes in lymph nodes are reduced. In a Th1-polarized peritonitis model, lymphocyte trafficking into the peritoneal cavity is impaired and fewer leukocytes leave the bloodstream. Cybr-deficient mice injected with Moloney murine sarcoma/leukemia virus develop larger tumors with reduced lymph node enlargement, indicating impaired cytotoxic T-lymphocyte migration. This places CYTIP as an in vivo regulator of leukocyte trafficking, especially under proinflammatory cytokine conditions.","method":"Cybr knockout mouse; flow cytometry of blood/lymph node populations; peritonitis model with leukocyte counting; tumor challenge model","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KO mouse with defined cellular phenotypes across multiple in vivo models, multiple orthogonal readouts","pmids":["16809763"],"is_preprint":false},{"year":2006,"finding":"Cybr (CYTIP)-deficient mice show no intrinsic defect in T- or B-cell development or function, and Cybr-deficient DCs migrate efficiently and stimulate T-cell proliferation and cytokine production in vivo upon adoptive transfer. However, competitive stem cell repopulation experiments reveal that Cybr-deficient hematopoietic precursors are at a developmental disadvantage compared to wild-type cells. These results indicate that CYTIP's immunological role is limited or largely redundant under steady-state conditions, and that prior overexpression/siRNA studies overestimated its role.","method":"Cybr knockout mouse; adoptive DC transfer; T-cell proliferation/cytokine assays; competitive bone marrow reconstitution","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean KO with multiple functional assays, single lab; finding is explicitly negative/limited for steady-state immune function","pmids":["16914744"],"is_preprint":false},{"year":2011,"finding":"Infection of human monocyte-derived DCs with herpes simplex virus type 1 (HSV-1) causes rapid proteasome-dependent degradation of CYTIP. Loss of CYTIP leads to activation of β2-integrins (predominantly LFA-1), increased DC adhesion, and impaired DC migration. This identifies CYTIP degradation as a viral immune-evasion mechanism that traps DCs at the site of infection by locking them in a high-adhesion state.","method":"HSV-1 infection of human monocyte-derived DCs; Western blot of CYTIP levels; proteasome inhibitor rescue; β2-integrin activation assay; transwell migration assay","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct mechanistic chain from viral infection → CYTIP degradation → integrin activation → adhesion/migration defect established with proteasome inhibitor rescue and multiple orthogonal assays","pmids":["21562043"],"is_preprint":false},{"year":2012,"finding":"In a contact hypersensitivity (CHS) model using Cytip knockout mice, DCs lacking CYTIP induced an increased inflammatory reaction (greater ear swelling) in both sensitization and elicitation phases. Cytip-deficient bone-marrow-derived DCs produced more IL-12 after CpG stimulation and induced stronger proliferation of antigen-specific CD4+ and CD8+ T cells in vitro, while skin DC migration was unaffected. This establishes CYTIP as a suppressor of DC immunostimulatory capacity in vivo.","method":"Cytip knockout mice; TNCB-induced CHS model; ear-swelling measurement; IL-12 ELISA; antigen-specific T-cell proliferation assay; DC migration assay","journal":"European journal of immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KO mouse, in vivo CHS model with defined phenotype, supported by multiple in vitro mechanistic assays","pmids":["22488362"],"is_preprint":false},{"year":2017,"finding":"Human cytomegalovirus (HCMV) infection of mature DCs induces proteasome-dependent degradation of CYTIP in directly infected cells (those with viral gene expression). This results in activation of β2-integrins, strong adhesion of HCMV-positive DCs to fibronectin and ICAM-1, and impaired transwell migration toward the CCL19 chemokine gradient despite maintained CCR7 expression. CXCR4 expression is elevated in HCMV-infected DCs and CXCL12-directed chemotaxis is retained, suggesting preferential re-routing of infected DCs toward bone marrow rather than secondary lymphoid organs.","method":"HCMV infection of human monocyte-derived DCs; Western blot of CYTIP; proteasome inhibitor treatment; β2-integrin activation assay; fibronectin/ICAM-1 adhesion assay; CCL19/CXCL12 transwell migration assay; flow cytometry for CCR7/CXCR4","journal":"Frontiers in immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mechanistic chain established with multiple assays; single lab, extends HSV-1 finding to HCMV","pmids":["28484459"],"is_preprint":false}],"current_model":"CYTIP (cytohesin-interacting protein) is an intracellular scaffold protein expressed predominantly in hematopoietic cells that binds cytohesin-1 via coiled-coil domains, enhances its ARF GEF activity in vitro, and sequesters cytohesin-1 away from the plasma membrane upon stimulation to deactivate LFA-1/β2-integrins, thereby attenuating leukocyte adhesion and promoting DC–T-cell deattachment; in DCs, CYTIP is induced upon maturation and is required for normal leukocyte trafficking in vivo, while both HSV-1 and HCMV exploit proteasomal degradation of CYTIP to lock infected DCs in a high-adhesion, migration-impaired state as an immune evasion mechanism."},"narrative":{"mechanistic_narrative":"CYTIP (Cybr) is an intracellular scaffold protein that negatively regulates leukocyte integrin activation and adhesion, thereby controlling immune cell trafficking and dendritic cell (DC)–T-cell interactions [PMID:12606567, PMID:16809763]. It binds cytohesin-1 through reciprocal coiled-coil domains and enhances cytohesin-1-mediated nucleotide exchange on ARF GTPases in vitro [PMID:11867758]. Upon integrin signaling or phorbol-ester stimulation, CYTIP is recruited to the cell cortex via its PDZ domain and sequesters cytohesin-1 away from the plasma membrane, repressing LFA-1/β2-integrin-mediated adhesion to ICAM-1 [PMID:12606567]. In DCs, CYTIP is induced during maturation, accumulates at DC–T-cell contact zones, and mediates deattachment to permit dissolution of the immune synapse [PMID:16204317]. In vivo, CYTIP-deficient mice show reduced circulating leukocytes and impaired lymphocyte trafficking under proinflammatory conditions, alongside an enhanced DC immunostimulatory capacity, identifying CYTIP as a suppressor of DC activation [PMID:16809763, PMID:22488362]. Both HSV-1 and HCMV exploit proteasome-dependent degradation of CYTIP as an immune-evasion strategy, activating β2-integrins to lock infected DCs in a high-adhesion, migration-impaired state [PMID:21562043, PMID:28484459].","teleology":[{"year":2002,"claim":"Establishing CYTIP's primary molecular partner and biochemical effect addressed how this protein engages the integrin-regulatory machinery; it was shown to bind cytohesin-1 and potentiate its ARF GEF activity.","evidence":"Co-immunoprecipitation of overexpressed proteins in 293T cells and in vitro ARF GEF (GTPγS binding) assay","pmids":["11867758"],"confidence":"Medium","gaps":["Interaction shown only with overexpressed proteins, not endogenous","Functional consequence of GEF enhancement on adhesion not yet tested","No cellular localization context"]},{"year":2003,"claim":"Resolving how CYTIP affects integrin function revealed it acts as a sequestration protein, using its PDZ domain to pull cytohesin-1 off the membrane and repress LFA-1-mediated adhesion.","evidence":"Fluorescence localization, PDZ-domain interaction studies, and Jurkat–ICAM-1 adhesion assay with co-expression requirement","pmids":["12606567"],"confidence":"High","gaps":["Relies on overexpression in Jurkat cells","Cortical recruitment trigger and adaptor partners not fully mapped","In vivo relevance not addressed"]},{"year":2005,"claim":"Linking CYTIP to DC biology defined its physiological setting; it is maturation-induced, localizes to DC–T-cell contacts, and mediates synapse deattachment to tune T-cell priming.","evidence":"siRNA knockdown in human DCs with DC–T-cell and fibronectin adhesion assays, T-cell priming assays, and contact-zone microscopy","pmids":["16204317"],"confidence":"High","gaps":["siRNA-based loss of function only","Molecular link between deattachment and reduced priming not fully resolved","Does not establish requirement in vivo"]},{"year":2006,"claim":"Genetic knockout tested CYTIP's in vivo requirement, showing it regulates leukocyte trafficking and CTL migration under proinflammatory conditions, while also revealing its steady-state role is limited and redundant.","evidence":"Cybr knockout mice analyzed by flow cytometry, peritonitis and tumor challenge models, adoptive DC transfer, and competitive bone marrow reconstitution","pmids":["16809763","16914744"],"confidence":"High","gaps":["Discrepancy between knockout and overexpression/siRNA phenotypes indicates context-dependence not fully explained","Mechanism of trafficking defect at molecular level not dissected in vivo","Hematopoietic competitive disadvantage mechanism unknown"]},{"year":2012,"claim":"A contact hypersensitivity model clarified CYTIP's net immunological output, establishing it as a suppressor of DC immunostimulatory capacity rather than a positive effector.","evidence":"Cytip knockout mice in TNCB-induced CHS model with ear-swelling, IL-12 ELISA, and antigen-specific T-cell proliferation assays","pmids":["22488362"],"confidence":"High","gaps":["Molecular basis for elevated IL-12 production not defined","Skin DC migration unaffected, leaving the trafficking role context-specific","Link to integrin/cytohesin axis in this phenotype not directly tested"]},{"year":2017,"claim":"Demonstrating viral targeting of CYTIP showed that pathogens weaponize its degradation; HSV-1 and HCMV trigger proteasomal destruction of CYTIP to activate β2-integrins and immobilize infected DCs.","evidence":"HSV-1 and HCMV infection of human monocyte-derived DCs with Western blot, proteasome inhibitor rescue, integrin activation, adhesion, and transwell migration assays","pmids":["21562043","28484459"],"confidence":"High","gaps":["Viral factor and E3 ligase mediating CYTIP degradation not identified","Whether CXCR4-directed re-routing of HCMV-infected DCs occurs in vivo not established","HCMV finding from single lab extending the HSV-1 model"]},{"year":null,"claim":"The identity of the viral and host machinery that targets CYTIP for proteasomal degradation, and how CYTIP's sequestration mechanism integrates with the divergent in vivo phenotypes, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No E3 ubiquitin ligase or viral effector identified for CYTIP degradation","Structural basis of PDZ-mediated cortical recruitment unknown","Reconciliation of suppressor vs. trafficking-promoting roles incomplete"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,1]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[1]},{"term_id":"GO:0140313","term_label":"molecular sequestering activity","supporting_discovery_ids":[1]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[1]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[1,2]}],"pathway":[{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[2,3,6]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[1]}],"complexes":[],"partners":["CYTH1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"O60759","full_name":"Cytohesin-interacting protein","aliases":["Cytohesin binder and regulator","CYBR","Cytohesin-associated scaffolding protein","CASP","Cytohesin-binding protein HE","Cbp HE","Pleckstrin homology Sec7 and coiled-coil domains-binding protein"],"length_aa":359,"mass_kda":40.0,"function":"By its binding to cytohesin-1 (CYTH1), it modifies activation of ARFs by CYTH1 and its precise function may be to sequester CYTH1 in the cytoplasm","subcellular_location":"Cytoplasm; Early endosome","url":"https://www.uniprot.org/uniprotkb/O60759/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CYTIP","classification":"Not Classified","n_dependent_lines":2,"n_total_lines":1208,"dependency_fraction":0.0016556291390728477},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/CYTIP","total_profiled":1310},"omim":[{"mim_id":"604448","title":"CYTOHESIN 1-INTERACTING PROTEIN; CYTIP","url":"https://www.omim.org/entry/604448"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Cytosol","reliability":"Supported"},{"location":"Nucleoplasm","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"bone marrow","ntpm":99.7},{"tissue":"lymphoid tissue","ntpm":107.1}],"url":"https://www.proteinatlas.org/search/CYTIP"},"hgnc":{"alias_symbol":["B3-1","HE","CYBR","CASP","CYTHIP"],"prev_symbol":["PSCDBP"]},"alphafold":{"accession":"O60759","domains":[{"cath_id":"2.30.42.10","chopping":"76-166","consensus_level":"high","plddt":89.761,"start":76,"end":166}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O60759","model_url":"https://alphafold.ebi.ac.uk/files/AF-O60759-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O60759-F1-predicted_aligned_error_v6.png","plddt_mean":62.62},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CYTIP","jax_strain_url":"https://www.jax.org/strain/search?query=CYTIP"},"sequence":{"accession":"O60759","fasta_url":"https://rest.uniprot.org/uniprotkb/O60759.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O60759/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O60759"}},"corpus_meta":[{"pmid":"6111794","id":"PMC_6111794","title":"Intracellular 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immunology","url":"https://pubmed.ncbi.nlm.nih.gov/22488362","citation_count":8,"is_preprint":false},{"pmid":"39178679","id":"PMC_39178679","title":"Exploring the anti-ovarian aging mechanism of He's Yangchao formula: Insights from multi-omics analysis in naturally aged mice.","date":"2024","source":"Phytomedicine : international journal of phytotherapy and phytopharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/39178679","citation_count":8,"is_preprint":false},{"pmid":"38016049","id":"PMC_38016049","title":"A specialized HE testing clinic improves rational decision-making for therapy in cirrhosis.","date":"2023","source":"Hepatology communications","url":"https://pubmed.ncbi.nlm.nih.gov/38016049","citation_count":8,"is_preprint":false},{"pmid":"37606786","id":"PMC_37606786","title":"Lessons on brain edema in HE: from cellular to animal models and clinical studies.","date":"2023","source":"Metabolic brain disease","url":"https://pubmed.ncbi.nlm.nih.gov/37606786","citation_count":8,"is_preprint":false},{"pmid":"26498625","id":"PMC_26498625","title":"Cell wall reconstruction and DNA damage repair play a key role in the improved salt tolerance effects of He-Ne laser irradiation in tall fescue seedlings.","date":"2015","source":"Bioscience, biotechnology, and biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/26498625","citation_count":8,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":53131,"output_tokens":2849,"usd":0.101064,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":9797,"output_tokens":2660,"usd":0.057743,"stage2_stop_reason":"end_turn"},"total_usd":0.158807,"stage1_batch_id":"msgbatch_01ACAxJQabDsht39JXeWG22d","stage2_batch_id":"msgbatch_01QEU22A9U5sbPTgsMzTmvSf","note":"batch pricing = 50% of standard"},"stage1_raw":"Looking at the corpus, I need to identify papers about CYTIP (also known as CYBR, CYTHIP, PSCDBP, B3-1, HE). The relevant papers are:\n\n- PMID 12606567: Boehm et al. 2003 (EMBO J) - CYTIP mechanism\n- PMID 11867758: Tang et al. 2002 (PNAS) - Cybr/CYTIP mechanism\n- PMID 16204317: Hofer et al. 2005 (Blood) - CYTIP in DCs\n- PMID 21562043: Theodoridis et al. 2011 (Blood) - HSV-1 and CYTIP\n- PMID 16914744: Watford et al. 2006 (MCB) - Cybr KO mice\n- PMID 16809763: Coppola et al. 2006 (MCB) - Cybr in leukocyte trafficking\n- PMID 28484459: Grosche et al. 2017 (Front Immunol) - HCMV and CYTIP\n- PMID 22488362: Heib et al. 2012 (Eur J Immunol) - Cytip in contact hypersensitivity\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2002,\n      \"finding\": \"CYTIP (Cybr) physically interacts with cytohesin-1 through coiled-coil domains of both proteins, as demonstrated by co-immunoprecipitation of overexpressed proteins from 293T cells. Cybr enhances cytohesin-1-mediated acceleration of GTPγS binding to ARF GTPases in vitro, identifying CYTIP as a positive regulator of cytohesin-1 guanine nucleotide exchange factor activity.\",\n      \"method\": \"Co-immunoprecipitation (overexpressed proteins in 293T cells); in vitro ARF GEF activity assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP plus in vitro GEF assay in single lab; two orthogonal methods but overexpression system\",\n      \"pmids\": [\"11867758\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"CYTIP is recruited to the cell cortex via its PDZ domain in response to integrin signaling, and co-expression of CYTIP is strictly required for phorbol-ester-stimulated membrane detachment of cytohesin-1. CYTIP sequesters cytohesin-1 away from the plasma membrane upon stimulation, thereby repressing LFA-1-mediated adhesion of Jurkat cells to ICAM-1. This identifies CYTIP as a signal-complex sequestration protein that attenuates leukocyte adhesion.\",\n      \"method\": \"Subcellular localization by fluorescence microscopy; overexpression and co-expression functional adhesion assay (Jurkat–ICAM-1); PDZ-domain interaction studies\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct localization experiment tied to functional consequence, adhesion assay with co-expression requirement established mechanistically, replicated across multiple experimental conditions in one rigorous study\",\n      \"pmids\": [\"12606567\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"CYTIP is induced during dendritic cell (DC) maturation and transiently accumulates at DC–T-cell contact zones within the first hour of co-culture. Specific siRNA-mediated silencing of CYTIP increases DC adhesion to T cells and to fibronectin, and reduces DC priming capacity when antigen is limiting, demonstrating that CYTIP actively mediates DC–T-cell deattachment to permit dissolution of the immune synapse.\",\n      \"method\": \"siRNA knockdown in DCs; DC–T-cell co-culture adhesion assay; fibronectin adhesion assay; T-cell priming assay; fluorescence microscopy of contact zones\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — loss-of-function with specific phenotypic readout (adhesion, priming), direct localization with functional consequence, multiple orthogonal assays in one study\",\n      \"pmids\": [\"16204317\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"In Cybr (CYTIP)-deficient mice generated by gene knockout, circulating leukocytes in blood and lymphocytes in lymph nodes are reduced. In a Th1-polarized peritonitis model, lymphocyte trafficking into the peritoneal cavity is impaired and fewer leukocytes leave the bloodstream. Cybr-deficient mice injected with Moloney murine sarcoma/leukemia virus develop larger tumors with reduced lymph node enlargement, indicating impaired cytotoxic T-lymphocyte migration. This places CYTIP as an in vivo regulator of leukocyte trafficking, especially under proinflammatory cytokine conditions.\",\n      \"method\": \"Cybr knockout mouse; flow cytometry of blood/lymph node populations; peritonitis model with leukocyte counting; tumor challenge model\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KO mouse with defined cellular phenotypes across multiple in vivo models, multiple orthogonal readouts\",\n      \"pmids\": [\"16809763\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Cybr (CYTIP)-deficient mice show no intrinsic defect in T- or B-cell development or function, and Cybr-deficient DCs migrate efficiently and stimulate T-cell proliferation and cytokine production in vivo upon adoptive transfer. However, competitive stem cell repopulation experiments reveal that Cybr-deficient hematopoietic precursors are at a developmental disadvantage compared to wild-type cells. These results indicate that CYTIP's immunological role is limited or largely redundant under steady-state conditions, and that prior overexpression/siRNA studies overestimated its role.\",\n      \"method\": \"Cybr knockout mouse; adoptive DC transfer; T-cell proliferation/cytokine assays; competitive bone marrow reconstitution\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean KO with multiple functional assays, single lab; finding is explicitly negative/limited for steady-state immune function\",\n      \"pmids\": [\"16914744\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Infection of human monocyte-derived DCs with herpes simplex virus type 1 (HSV-1) causes rapid proteasome-dependent degradation of CYTIP. Loss of CYTIP leads to activation of β2-integrins (predominantly LFA-1), increased DC adhesion, and impaired DC migration. This identifies CYTIP degradation as a viral immune-evasion mechanism that traps DCs at the site of infection by locking them in a high-adhesion state.\",\n      \"method\": \"HSV-1 infection of human monocyte-derived DCs; Western blot of CYTIP levels; proteasome inhibitor rescue; β2-integrin activation assay; transwell migration assay\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct mechanistic chain from viral infection → CYTIP degradation → integrin activation → adhesion/migration defect established with proteasome inhibitor rescue and multiple orthogonal assays\",\n      \"pmids\": [\"21562043\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"In a contact hypersensitivity (CHS) model using Cytip knockout mice, DCs lacking CYTIP induced an increased inflammatory reaction (greater ear swelling) in both sensitization and elicitation phases. Cytip-deficient bone-marrow-derived DCs produced more IL-12 after CpG stimulation and induced stronger proliferation of antigen-specific CD4+ and CD8+ T cells in vitro, while skin DC migration was unaffected. This establishes CYTIP as a suppressor of DC immunostimulatory capacity in vivo.\",\n      \"method\": \"Cytip knockout mice; TNCB-induced CHS model; ear-swelling measurement; IL-12 ELISA; antigen-specific T-cell proliferation assay; DC migration assay\",\n      \"journal\": \"European journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KO mouse, in vivo CHS model with defined phenotype, supported by multiple in vitro mechanistic assays\",\n      \"pmids\": [\"22488362\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Human cytomegalovirus (HCMV) infection of mature DCs induces proteasome-dependent degradation of CYTIP in directly infected cells (those with viral gene expression). This results in activation of β2-integrins, strong adhesion of HCMV-positive DCs to fibronectin and ICAM-1, and impaired transwell migration toward the CCL19 chemokine gradient despite maintained CCR7 expression. CXCR4 expression is elevated in HCMV-infected DCs and CXCL12-directed chemotaxis is retained, suggesting preferential re-routing of infected DCs toward bone marrow rather than secondary lymphoid organs.\",\n      \"method\": \"HCMV infection of human monocyte-derived DCs; Western blot of CYTIP; proteasome inhibitor treatment; β2-integrin activation assay; fibronectin/ICAM-1 adhesion assay; CCL19/CXCL12 transwell migration assay; flow cytometry for CCR7/CXCR4\",\n      \"journal\": \"Frontiers in immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mechanistic chain established with multiple assays; single lab, extends HSV-1 finding to HCMV\",\n      \"pmids\": [\"28484459\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CYTIP (cytohesin-interacting protein) is an intracellular scaffold protein expressed predominantly in hematopoietic cells that binds cytohesin-1 via coiled-coil domains, enhances its ARF GEF activity in vitro, and sequesters cytohesin-1 away from the plasma membrane upon stimulation to deactivate LFA-1/β2-integrins, thereby attenuating leukocyte adhesion and promoting DC–T-cell deattachment; in DCs, CYTIP is induced upon maturation and is required for normal leukocyte trafficking in vivo, while both HSV-1 and HCMV exploit proteasomal degradation of CYTIP to lock infected DCs in a high-adhesion, migration-impaired state as an immune evasion mechanism.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CYTIP (Cybr) is an intracellular scaffold protein that negatively regulates leukocyte integrin activation and adhesion, thereby controlling immune cell trafficking and dendritic cell (DC)–T-cell interactions [#1, #3]. It binds cytohesin-1 through reciprocal coiled-coil domains and enhances cytohesin-1-mediated nucleotide exchange on ARF GTPases in vitro [#0]. Upon integrin signaling or phorbol-ester stimulation, CYTIP is recruited to the cell cortex via its PDZ domain and sequesters cytohesin-1 away from the plasma membrane, repressing LFA-1/β2-integrin-mediated adhesion to ICAM-1 [#1]. In DCs, CYTIP is induced during maturation, accumulates at DC–T-cell contact zones, and mediates deattachment to permit dissolution of the immune synapse [#2]. In vivo, CYTIP-deficient mice show reduced circulating leukocytes and impaired lymphocyte trafficking under proinflammatory conditions, alongside an enhanced DC immunostimulatory capacity, identifying CYTIP as a suppressor of DC activation [#3, #6]. Both HSV-1 and HCMV exploit proteasome-dependent degradation of CYTIP as an immune-evasion strategy, activating β2-integrins to lock infected DCs in a high-adhesion, migration-impaired state [#5, #7].\",\n  \"teleology\": [\n    {\n      \"year\": 2002,\n      \"claim\": \"Establishing CYTIP's primary molecular partner and biochemical effect addressed how this protein engages the integrin-regulatory machinery; it was shown to bind cytohesin-1 and potentiate its ARF GEF activity.\",\n      \"evidence\": \"Co-immunoprecipitation of overexpressed proteins in 293T cells and in vitro ARF GEF (GTPγS binding) assay\",\n      \"pmids\": [\"11867758\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Interaction shown only with overexpressed proteins, not endogenous\", \"Functional consequence of GEF enhancement on adhesion not yet tested\", \"No cellular localization context\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Resolving how CYTIP affects integrin function revealed it acts as a sequestration protein, using its PDZ domain to pull cytohesin-1 off the membrane and repress LFA-1-mediated adhesion.\",\n      \"evidence\": \"Fluorescence localization, PDZ-domain interaction studies, and Jurkat–ICAM-1 adhesion assay with co-expression requirement\",\n      \"pmids\": [\"12606567\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relies on overexpression in Jurkat cells\", \"Cortical recruitment trigger and adaptor partners not fully mapped\", \"In vivo relevance not addressed\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Linking CYTIP to DC biology defined its physiological setting; it is maturation-induced, localizes to DC–T-cell contacts, and mediates synapse deattachment to tune T-cell priming.\",\n      \"evidence\": \"siRNA knockdown in human DCs with DC–T-cell and fibronectin adhesion assays, T-cell priming assays, and contact-zone microscopy\",\n      \"pmids\": [\"16204317\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"siRNA-based loss of function only\", \"Molecular link between deattachment and reduced priming not fully resolved\", \"Does not establish requirement in vivo\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Genetic knockout tested CYTIP's in vivo requirement, showing it regulates leukocyte trafficking and CTL migration under proinflammatory conditions, while also revealing its steady-state role is limited and redundant.\",\n      \"evidence\": \"Cybr knockout mice analyzed by flow cytometry, peritonitis and tumor challenge models, adoptive DC transfer, and competitive bone marrow reconstitution\",\n      \"pmids\": [\"16809763\", \"16914744\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Discrepancy between knockout and overexpression/siRNA phenotypes indicates context-dependence not fully explained\", \"Mechanism of trafficking defect at molecular level not dissected in vivo\", \"Hematopoietic competitive disadvantage mechanism unknown\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"A contact hypersensitivity model clarified CYTIP's net immunological output, establishing it as a suppressor of DC immunostimulatory capacity rather than a positive effector.\",\n      \"evidence\": \"Cytip knockout mice in TNCB-induced CHS model with ear-swelling, IL-12 ELISA, and antigen-specific T-cell proliferation assays\",\n      \"pmids\": [\"22488362\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis for elevated IL-12 production not defined\", \"Skin DC migration unaffected, leaving the trafficking role context-specific\", \"Link to integrin/cytohesin axis in this phenotype not directly tested\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Demonstrating viral targeting of CYTIP showed that pathogens weaponize its degradation; HSV-1 and HCMV trigger proteasomal destruction of CYTIP to activate β2-integrins and immobilize infected DCs.\",\n      \"evidence\": \"HSV-1 and HCMV infection of human monocyte-derived DCs with Western blot, proteasome inhibitor rescue, integrin activation, adhesion, and transwell migration assays\",\n      \"pmids\": [\"21562043\", \"28484459\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Viral factor and E3 ligase mediating CYTIP degradation not identified\", \"Whether CXCR4-directed re-routing of HCMV-infected DCs occurs in vivo not established\", \"HCMV finding from single lab extending the HSV-1 model\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The identity of the viral and host machinery that targets CYTIP for proteasomal degradation, and how CYTIP's sequestration mechanism integrates with the divergent in vivo phenotypes, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No E3 ubiquitin ligase or viral effector identified for CYTIP degradation\", \"Structural basis of PDZ-mediated cortical recruitment unknown\", \"Reconciliation of suppressor vs. trafficking-promoting roles incomplete\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [1]},\n      {\"term_id\": \"GO:0140313\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [1]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [1, 2]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [2, 3, 6]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"CYTH1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}