{"gene":"HIVEP2","run_date":"2026-06-10T01:55:22","timeline":{"discoveries":[{"year":1991,"finding":"HIV-EP2 (HIVEP2) protein was identified as a large metal-finger transcription factor (1,833 aa, MW ~211 kDa) that binds to the HIV-1 enhancer with a DNA-binding domain consisting of a metal-finger structure, similar to HIV-EP1. The protein contains a nuclear localization signal followed by a Ser/Thr-rich region, a metal-finger DNA-binding domain, and a cluster of acidic amino acids. Expression of HIV-EP2 mRNA is greatly induced by mitogen and phorbol ester treatment of Jurkat T cells.","method":"cDNA cloning, cross-hybridization, protein domain analysis, Northern blotting, DNA-binding characterization","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — cDNA cloning with DNA-binding characterization and domain mapping; single lab but multiple complementary methods","pmids":["2022670"],"is_preprint":false},{"year":1994,"finding":"MIBP1 (rat ortholog of HIVEP2/MBP-2) binds sequence-specifically to a 9-bp sequence in rat c-myc intron 1 via its zinc finger regions, demonstrated by expression of a fusion protein in E. coli. The protein has two widely separated zinc finger regions each carrying C2H2 motifs.","method":"cDNA cloning, in vitro DNA-binding assay with bacterially expressed fusion protein, Northern blotting","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro binding assay with recombinant protein; single lab, sequence-specific binding demonstrated directly","pmids":["7838722"],"is_preprint":false},{"year":1996,"finding":"MIBP1 (HIVEP2) and RFX1 associate in vivo to form a complex that binds to the EP element within hepatitis B virus enhancer I. The EP site alone can repress transcription of the SV40 promoter in a position- and orientation-independent manner, suggesting silencer function.","method":"Supershift assay with polyclonal antisera, DNA-protein complex analysis, transcriptional reporter assay","journal":"Journal of virology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — antibody-based identification of complex plus functional reporter assay; single lab, two orthogonal methods","pmids":["8709229"],"is_preprint":false},{"year":1997,"finding":"MIBP1 (HIVEP2) and RFX1 can bind simultaneously, most likely as a heterodimer, to the NRE gamma subregion of the hepatitis B virus core promoter negative regulatory element, and this binding is required for the gene-suppressive activity of NRE gamma.","method":"DNA binding assay, mutagenesis of NRE gamma, gel mobility shift assay with RFX1 and MIBP1","journal":"Virology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gel shift with mutation validation; single lab, binding and functional correlation established","pmids":["9018153"],"is_preprint":false},{"year":1999,"finding":"MIBP1 (HIVEP2) interacts specifically with a TC-rich enhancer element in the SSTR-2 promoter and with the SEF-2 initiator-binding protein to enhance transcription from the basal SSTR-2 promoter. MIBP1 mRNA expression overlaps precisely with SSTR-2 expression in the frontal cortex and hippocampus.","method":"cDNA library screening, DNA binding assay, transcriptional co-activation assay, in situ hybridization, Northern blotting","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct DNA binding plus transcriptional assay plus in situ hybridization; single lab, multiple orthogonal methods","pmids":["10207097"],"is_preprint":false},{"year":2000,"finding":"MIBP1 (HIVEP2) and RFX1 are induced during retinoic acid-mediated granulocytic differentiation of HL60 cells. Both proteins are absent from undifferentiated HL60 cells and their induction is inversely correlated with down-regulation of c-myc levels, supporting a role for MIBP1 in silencing c-myc during differentiation.","method":"Immunoblot, gel mobility shift assay, retinoic acid differentiation assay, time-course analysis","journal":"The Biochemical journal","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, correlative induction data without direct mechanistic dissection of MIBP1 function","pmids":["10642512"],"is_preprint":false},{"year":2001,"finding":"Shn-2 (HIVEP2) knockout mice exhibit severely defective positive selection of CD4+ and CD8+ T cells in the thymus, establishing that Shn-2 is required for the survival signals initiated by T cell receptor engagement during positive selection.","method":"Shn-2 knockout mouse model, flow cytometry of thymocyte populations","journal":"Nature immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KO mouse with specific immunological phenotype, defined cellular process; replicated in follow-up studies","pmids":["11668343"],"is_preprint":false},{"year":2002,"finding":"MIBP1 (HIVEP2) represses c-myc transcription from the major promoter P2. MIBP1 physically interacts with the Ski-interacting protein (SKIP), confirmed by yeast two-hybrid, in vitro pull-down assay, and co-immunoprecipitation. The acidic region of MIBP1 interacts with the N-terminal half of SKIP. MIBP1 is highly expressed in post-mitotic neurons but not in immature neuroepithelium.","method":"Transcriptional reporter assay, yeast two-hybrid, in vitro pull-down, co-immunoprecipitation, in situ hybridization","journal":"Journal of biochemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP plus pull-down plus yeast two-hybrid; single lab with three orthogonal methods confirming SKIP interaction","pmids":["11872163"],"is_preprint":false},{"year":2005,"finding":"Shn-2 (HIVEP2)-deficient mice show dramatically enhanced differentiation of naive T cells into Th2 cells with constitutive activation of NF-κB and enhanced GATA3 induction. Shn-2 competes with p50 NF-κB for binding to a consensus NF-κB motif and inhibits NF-κB-driven promoter activity, establishing Shn-2 as a negative regulator of Th2 differentiation via NF-κB repression.","method":"Shn-2 KO mouse, in vitro Th1/Th2 differentiation assay, NF-κB binding competition assay, promoter reporter assay, flow cytometry","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — KO mouse with defined cellular phenotype, NF-κB binding competition, and promoter reporter assay; multiple orthogonal methods","pmids":["15699073"],"is_preprint":false},{"year":2006,"finding":"Shn-2 (HIVEP2) KO mice have reduced white adipose tissue and Shn-2-deficient mouse embryonic fibroblasts cannot efficiently differentiate into adipocytes. Shn-2 enters the nucleus upon BMP-2 stimulation and, in cooperation with Smad1/4 and C/EBPalpha, induces PPARgamma2 expression. Shn-2 directly interacts with both Smad1/4 and C/EBPalpha on the PPARgamma2 promoter.","method":"Shn-2 KO mouse, MEF differentiation assay, nuclear translocation imaging, co-immunoprecipitation, chromatin immunoprecipitation, reporter assay","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — KO mouse, MEF in vitro differentiation, nuclear translocation, direct protein interaction by Co-IP, and promoter ChIP; multiple orthogonal methods in one rigorous study","pmids":["16580992"],"is_preprint":false},{"year":2006,"finding":"Shn-2 (HIVEP2) KO mice exhibit hypersensitivity to stress, increased anxiety-like behavior, hyperactivity, and elevated stress-induced corticosterone levels. Basal and stress-induced c-Fos expression are decreased in Shn-2 KO mice, indicating a role for Shn-2 in regulating neuronal immediate-early gene expression and stress responses.","method":"Shn-2 KO mouse, behavioral testing, corticosterone measurement, immunohistochemistry for c-Fos","journal":"Brain research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO mouse with defined behavioral phenotype and molecular readout (c-Fos); single lab","pmids":["16836985"],"is_preprint":false},{"year":2007,"finding":"Shn-2 (HIVEP2) deficiency suppresses osteoblastic bone formation (reduced osterix, osteocalcin, mineralization) and osteoclastic bone resorption (reduced Nfatc1, c-fos, TRAP-positive cells). Shn-2 overexpression enhances osteocalcin promoter activity and BMP-dependent osteoblastic differentiation, placing Shn-2 as a positive regulator of transcription factors required for bone remodeling.","method":"Shn-2 KO mouse, bone histomorphometry, in vitro mineralization assay, promoter reporter assay, bone marrow cell culture","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — KO mouse plus overexpression plus promoter reporter; multiple orthogonal methods demonstrating bidirectional regulation","pmids":["17311925"],"is_preprint":false},{"year":2007,"finding":"Shn-2 (HIVEP2)-deficient effector Th1/Th2 cells have increased susceptibility to apoptosis associated with increased FasL expression, leading to failure in memory T cell generation. Shn-2 repression of NF-κB controls FasL expression and is required for cell survival during memory T cell formation.","method":"Shn-2 KO mouse, adoptive transfer, BrdU incorporation, apoptosis assay, CD69/FasL measurement, p65 NF-κB overexpression experiment","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — KO mouse, adoptive transfer, apoptosis assays, and NF-κB overexpression epistasis; multiple orthogonal methods","pmids":["17404274"],"is_preprint":false},{"year":2009,"finding":"CLIC4 interacts with Schnurri-2 (HIVEP2) in the cytoplasm upon TGF-beta stimulation, and they co-translocate to the nucleus. In the nucleus, CLIC4 associates with phospho-Smad2 and phospho-Smad3, protecting them from dephosphorylation by nuclear phosphatases. In the absence of Schnurri-2, TGF-beta signaling is abrogated; direct nuclear targeting of CLIC4 rescues signaling and removes the requirement for Schnurri-2.","method":"Co-immunoprecipitation, nuclear fractionation, TGF-beta signaling assays, siRNA knockdown, nuclear targeting constructs, phospho-Smad immunoblot","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, fractionation, genetic rescue with nuclear-targeted CLIC4, and phospho-Smad protection assay; multiple orthogonal methods in one rigorous study","pmids":["19448624"],"is_preprint":false},{"year":2011,"finding":"Shn-2 (HIVEP2) functions downstream of TCR proximal signaling to dampen Bax activation and the mitochondrial death pathway in double-positive thymocytes. Shn-2-deficient DP thymocytes inappropriately undergo negative selection in response to positive-selecting signals. Shn-2 levels increase after TCR stimulation. Genetic ablation of TCR-induced death rescues positive selection in Shn-2-deficient mice.","method":"Shn-2 KO mouse, genetic epistasis (death pathway ablation cross), Bax activation assay, in vitro TCR stimulation, in vivo selection assays, flow cytometry","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — KO mouse with genetic epistasis rescue, Bax activation assay, and in vitro/in vivo selection assays; multiple orthogonal methods establishing pathway position","pmids":["21475200"],"is_preprint":false},{"year":2011,"finding":"Shn-2 (HIVEP2) deficiency in NK cells leads to decreased perforin and granzyme-B expression, reduced STAT5 phosphorylation, enhanced STAT3 phosphorylation and NF-κB p65 expression, and decreased surface activation markers (CD27, CD69, CD122), resulting in impaired NK cell cytotoxicity and spontaneous CD3-positive lymphoma development.","method":"Shn-2 KO mouse, cytotoxicity assay, immunoblot for perforin/granzyme-B, phospho-STAT analysis, flow cytometry","journal":"Leukemia & lymphoma","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO mouse with defined cellular functional phenotype and molecular signaling readouts; single lab","pmids":["21936769"],"is_preprint":false},{"year":2012,"finding":"MIBP1 (HIVEP2) globally represses NF-κB target gene expression. MIBP1 binds to the NF-κB binding site and represses NF-κB-responsive promoter activity in reporter assays. Knockdown of endogenous MIBP1 upregulates NF-κB pathway genes. O-GlcNAc transferase (OGT) is a prominent MIBP1 binding partner identified by co-immunoprecipitation and mass spectrometry; a 154-amino acid region of MIBP1 is required for OGT binding and O-GlcNAcylation of MIBP1. O-GlcNAcylation attenuates MIBP1-mediated NF-κB repression.","method":"Microarray with GSEA, MIBP1 overexpression and knockdown, NF-κB reporter assay, Co-IP with mass spectrometry, deletion mutagenesis, luciferase assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP/MS identification of OGT interaction, deletion mutagenesis mapping, reporter assay with KD/OE, and genome-wide transcriptomics; multiple orthogonal methods in one study","pmids":["22294689"],"is_preprint":false},{"year":2019,"finding":"HIVEP2 is expressed in both the cytoplasm and nuclei of dopaminergic neurons and can target the intronic sequence GTGGCTTTCT of SLC6A3 (DAT), thereby activating the SLC6A3 gene.","method":"Immunofluorescence localization, chromatin binding/transcriptional activation assay for SLC6A3 intronic target","journal":"Translational psychiatry","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, localization and transcriptional target reported but limited mechanistic dissection; abstract does not specify the method used to demonstrate activation","pmids":["31586043"],"is_preprint":false},{"year":2022,"finding":"Shn-2 (HIVEP2) is upregulated in the L4-L6 spinal cord segments following spared nerve injury. Knockdown of Shn-2 using lentivirus decreases GluN2D subunit and GluR1 levels in the spinal cord and alleviates mechanical allodynia, indicating Shn-2 promotes expression of excitatory glutamate receptor subunits and contributes to neuropathic pain.","method":"Spared nerve injury mouse model, lentiviral knockdown of Shn-2, immunoblot for GluN2D and GluR1, mechanical allodynia testing","journal":"Neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo knockdown with defined molecular and behavioral phenotype; single lab","pmids":["35218885"],"is_preprint":false}],"current_model":"HIVEP2 (Schnurri-2/MIBP1) is a large zinc-finger transcription factor that (1) binds κB/NF-κB motifs to repress NF-κB-driven gene expression, with O-GlcNAcylation by OGT attenuating this repression; (2) translocates to the nucleus upon BMP-2 stimulation and cooperates with Smad1/4 and C/EBPα to induce PPARγ2, driving adipogenesis; (3) forms a cytoplasmic complex with CLIC4 that translocates to the nucleus in response to TGF-β, where CLIC4 protects phospho-Smad2/3 from dephosphorylation to sustain TGF-β signaling; (4) dampens Bax activation and the mitochondrial apoptotic pathway downstream of TCR signaling to enable positive selection of thymocytes; (5) interacts with SKIP via its acidic region to repress c-myc transcription; and (6) regulates expression of excitatory glutamate receptor subunits (GluN2D, GluR1) in spinal cord neurons, contributing to neuropathic pain."},"narrative":{"mechanistic_narrative":"HIVEP2 (Schnurri-2/MIBP1) is a large zinc-finger transcription factor that governs cell fate and survival decisions by acting as a context-dependent transcriptional repressor and a signal-responsive cofactor [PMID:2022670, PMID:15699073]. Through its C2H2 zinc-finger DNA-binding domain it engages specific sequence elements, including the HIV-1 enhancer and an intronic site in c-myc [PMID:2022670, PMID:7838722], and it represses transcription by binding κB/NF-κB motifs in direct competition with p50 NF-κB, thereby globally dampening NF-κB-driven gene expression [PMID:15699073, PMID:22294689]; this repression is attenuated by O-GlcNAcylation catalyzed by its binding partner OGT [PMID:22294689]. Its repressor functions extend to silencing c-myc, where it acts through physical interaction with the Ski-interacting protein SKIP via its acidic region [PMID:11872163], and it can also partner with RFX1 to bind viral negative-regulatory elements [PMID:8709229, PMID:9018153]. HIVEP2 additionally serves as a nuclear signal integrator: upon BMP-2 stimulation it translocates to the nucleus and cooperates with Smad1/4 and C/EBPα on the PPARγ2 promoter to drive adipogenesis and bone remodeling [PMID:16580992, PMID:17311925], and upon TGF-β stimulation it forms a cytoplasmic complex with CLIC4 that co-translocates to the nucleus to sustain phospho-Smad2/3 signaling [PMID:19448624]. In the immune system, Schnurri-2 enables positive selection of thymocytes by dampening TCR-induced Bax activation and the mitochondrial death pathway [PMID:21475200], suppresses Th2 differentiation and supports memory T-cell survival through NF-κB repression [PMID:15699073, PMID:17404274], and is required for NK-cell cytotoxic effector function [PMID:21936769]. In the nervous system it regulates immediate-early and neurotransmitter-related gene programs, influencing stress behavior and contributing to neuropathic pain through control of excitatory glutamate receptor subunit expression [PMID:16836985, PMID:35218885].","teleology":[{"year":1991,"claim":"Established HIVEP2 as a large metal/zinc-finger DNA-binding protein, defining its modular architecture and its inducibility in activated T cells.","evidence":"cDNA cloning, domain analysis, and DNA-binding characterization on the HIV-1 enhancer in Jurkat T cells","pmids":["2022670"],"confidence":"Medium","gaps":["No in vivo function established","Target genes beyond the HIV-1 enhancer not defined","Mechanism of transcriptional effect (activation vs repression) unresolved"]},{"year":1994,"claim":"Demonstrated sequence-specific DNA recognition by the zinc fingers at a defined c-myc intronic element, linking HIVEP2 to a specific cellular target gene.","evidence":"In vitro DNA-binding assay with bacterially expressed fusion protein on rat c-myc intron 1","pmids":["7838722"],"confidence":"Medium","gaps":["Functional transcriptional consequence not yet shown","No cellular validation of binding","Cofactor requirements unknown"]},{"year":1996,"claim":"Showed HIVEP2 partners with RFX1 to occupy viral regulatory elements and confer silencer activity, introducing a cofactor-dependent repression mechanism.","evidence":"Supershift and reporter assays on the HBV enhancer EP element","pmids":["8709229","9018153"],"confidence":"Medium","gaps":["Stoichiometry and heterodimer interface not defined","Generality beyond viral promoters unclear","Cellular targets not identified"]},{"year":1999,"claim":"Revealed that HIVEP2 can also act as a transcriptional activator at a cellular promoter, indicating context-dependent regulatory output.","evidence":"DNA binding, co-activation reporter assay with SEF-2, and in situ hybridization for SSTR-2 in brain","pmids":["10207097"],"confidence":"Medium","gaps":["Switch between activation and repression not mechanistically explained","No in vivo validation of SSTR-2 regulation"]},{"year":2002,"claim":"Identified SKIP as a direct repression cofactor binding the acidic region, providing a molecular basis for c-myc silencing.","evidence":"Yeast two-hybrid, in vitro pull-down, reciprocal Co-IP, and reporter assay; in situ hybridization in neurons","pmids":["11872163"],"confidence":"High","gaps":["Whether SKIP recruitment generalizes to other repressed genes unknown","Structural basis of the acidic-region/SKIP interaction undefined"]},{"year":2001,"claim":"Established an essential in vivo role: HIVEP2 is required for positive selection of thymocytes downstream of TCR engagement.","evidence":"Schnurri-2 knockout mouse with thymocyte flow cytometry","pmids":["11668343"],"confidence":"High","gaps":["Molecular mechanism of the survival signal not yet defined at this stage"]},{"year":2005,"claim":"Defined the core repressive mechanism in immunity: HIVEP2 competes with p50 NF-κB for the κB motif to restrain NF-κB-driven Th2 differentiation.","evidence":"KO mouse, in vitro Th differentiation, NF-κB binding competition and promoter reporter assays","pmids":["15699073"],"confidence":"High","gaps":["Genome-wide scope of NF-κB target repression not assessed here","Regulation of HIVEP2 occupancy in response to signals unclear"]},{"year":2006,"claim":"Established HIVEP2 as a BMP-2-responsive nuclear cofactor that cooperates with Smad1/4 and C/EBPα to induce PPARγ2 and drive adipogenesis.","evidence":"KO mouse, MEF differentiation, nuclear translocation imaging, Co-IP, and ChIP on the PPARγ2 promoter","pmids":["16580992"],"confidence":"High","gaps":["Signal that triggers nuclear entry mechanistically undefined","How the same factor switches between NF-κB repression and Smad coactivation unresolved"]},{"year":2006,"claim":"Extended HIVEP2 function to the nervous system, linking it to immediate-early gene (c-Fos) regulation and stress behavior.","evidence":"KO mouse behavioral testing, corticosterone measurement, and c-Fos immunohistochemistry","pmids":["16836985"],"confidence":"Medium","gaps":["Direct transcriptional targets in neurons not identified","Link between c-Fos changes and behavior correlative"]},{"year":2007,"claim":"Showed bidirectional control of bone remodeling, positioning HIVEP2 as a positive regulator of osteoblastic and osteoclastic transcription programs.","evidence":"KO mouse, bone histomorphometry, in vitro mineralization, and osteocalcin promoter reporter with overexpression","pmids":["17311925"],"confidence":"High","gaps":["Direct versus indirect effects on osteoclast genes not separated","Relationship to BMP/Smad cooperation in bone not fully resolved"]},{"year":2007,"claim":"Connected NF-κB repression to T-cell survival, showing HIVEP2 controls FasL expression to permit memory T-cell formation.","evidence":"KO mouse, adoptive transfer, apoptosis assays, and p65 NF-κB overexpression epistasis","pmids":["17404274"],"confidence":"High","gaps":["Whether FasL is a direct HIVEP2/NF-κB target gene not shown directly"]},{"year":2009,"claim":"Defined a cytoplasmic-to-nuclear signaling role: HIVEP2 chaperones CLIC4 to the nucleus to protect phospho-Smad2/3 and sustain TGF-β signaling.","evidence":"Reciprocal Co-IP, nuclear fractionation, siRNA knockdown, nuclear-targeting rescue, and phospho-Smad protection assays","pmids":["19448624"],"confidence":"High","gaps":["How TGF-β triggers the cytoplasmic CLIC4-HIVEP2 complex unclear","Relationship between this TGF-β role and the BMP/Smad1/4 role not integrated"]},{"year":2011,"claim":"Resolved the mechanism of positive selection: HIVEP2 dampens TCR-induced Bax activation and the mitochondrial death pathway in thymocytes.","evidence":"KO mouse with genetic epistasis (death-pathway ablation rescue), Bax activation assay, and in vivo/in vitro selection assays","pmids":["21475200"],"confidence":"High","gaps":["Transcriptional targets mediating Bax restraint not identified","Link to NF-κB repression in this context not established"]},{"year":2011,"claim":"Extended HIVEP2 immune function to NK cells, linking its loss to cytotoxic defects, altered STAT/NF-κB signaling, and lymphomagenesis.","evidence":"KO mouse cytotoxicity assays, perforin/granzyme-B immunoblot, and phospho-STAT/flow cytometry","pmids":["21936769"],"confidence":"Medium","gaps":["Direct transcriptional targets in NK cells undefined","Causal chain from signaling changes to lymphoma not established"]},{"year":2012,"claim":"Established genome-wide NF-κB repression and uncovered O-GlcNAcylation by OGT as a regulatory switch attenuating that repression.","evidence":"Microarray/GSEA with overexpression and knockdown, NF-κB reporter, Co-IP/mass spectrometry of OGT, and deletion mutagenesis mapping the OGT-binding region","pmids":["22294689"],"confidence":"High","gaps":["Specific O-GlcNAc-modified residues not mapped","Whether O-GlcNAcylation alters DNA binding or cofactor recruitment unresolved"]},{"year":2019,"claim":"Linked HIVEP2 to dopaminergic neuron gene regulation through activation of the SLC6A3 (DAT) gene.","evidence":"Immunofluorescence localization and transcriptional targeting of an SLC6A3 intronic sequence","pmids":["31586043"],"confidence":"Low","gaps":["Method of demonstrating activation not specified","Direct binding versus indirect effect not distinguished","Single lab, limited mechanistic dissection"]},{"year":2022,"claim":"Implicated HIVEP2 in neuropathic pain by showing it promotes excitatory glutamate receptor subunit expression in spinal cord.","evidence":"Spared nerve injury model with lentiviral Shn-2 knockdown, GluN2D/GluR1 immunoblot, and mechanical allodynia testing","pmids":["35218885"],"confidence":"Medium","gaps":["Direct transcriptional regulation of GluN2D/GluR1 not shown","Cell-type specificity in spinal cord undefined"]},{"year":null,"claim":"How a single factor toggles between NF-κB/SKIP-mediated repression and Smad/C/EBPα-mediated activation, and how post-translational modification and partner availability direct this switch across tissues, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model of the DNA-binding or acidic regions","Direct genome-wide target maps in neurons and bone lacking","Mechanism coordinating cytoplasmic CLIC4 complex versus nuclear repressor pools unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,8,9,16]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[0,1,8,16]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[13,7]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,9,13]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[13,17]}],"pathway":[{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[6,8,12,14]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[9,13]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[7,8,16]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[9,11]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[12,14]}],"complexes":[],"partners":["RFX1","SKIP","OGT","SMAD1","SMAD4","CEBPA","CLIC4","NFKB1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P31629","full_name":"Transcription factor HIVEP2","aliases":["Human immunodeficiency virus type I enhancer-binding protein 2","HIV-EP2","MHC-binding protein 2","MBP-2"],"length_aa":2446,"mass_kda":269.1,"function":"This protein specifically binds to the DNA sequence 5'-GGGACTTTCC-3' which is found in the enhancer elements of numerous viral promoters such as those of SV40, CMV, or HIV1. In addition, related sequences are found in the enhancer elements of a number of cellular promoters, including those of the class I MHC, interleukin-2 receptor, somatostatin receptor II, and interferon-beta genes. It may act in T-cell activation","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/P31629/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/HIVEP2","classification":"Not Classified","n_dependent_lines":7,"n_total_lines":1208,"dependency_fraction":0.005794701986754967},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/HIVEP2","total_profiled":1310},"omim":[{"mim_id":"616977","title":"INTELLECTUAL DEVELOPMENTAL DISORDER, AUTOSOMAL DOMINANT 43; MRD43","url":"https://www.omim.org/entry/616977"},{"mim_id":"606649","title":"HUMAN IMMUNODEFICIENCY VIRUS TYPE 1 ENHANCER-BINDING PROTEIN 3; HIVEP3","url":"https://www.omim.org/entry/606649"},{"mim_id":"606536","title":"CHLORIDE INTRACELLULAR CHANNEL 4; CLIC4","url":"https://www.omim.org/entry/606536"},{"mim_id":"602272","title":"TRANSCRIPTION FACTOR 4; TCF4","url":"https://www.omim.org/entry/602272"},{"mim_id":"182452","title":"SOMATOSTATIN RECEPTOR 2; SSTR2","url":"https://www.omim.org/entry/182452"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/HIVEP2"},"hgnc":{"alias_symbol":["MBP-2","HIV-EP2","MIBP1","ZAS2","Schnurri-2","ZNF40B"],"prev_symbol":[]},"alphafold":{"accession":"P31629","domains":[{"cath_id":"3.30.160.60","chopping":"187-246","consensus_level":"medium","plddt":90.292,"start":187,"end":246},{"cath_id":"3.30.160","chopping":"1790-1825","consensus_level":"medium","plddt":80.5639,"start":1790,"end":1825},{"cath_id":"3.30.160","chopping":"1826-1858","consensus_level":"medium","plddt":82.2988,"start":1826,"end":1858}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P31629","model_url":"https://alphafold.ebi.ac.uk/files/AF-P31629-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P31629-F1-predicted_aligned_error_v6.png","plddt_mean":36.34},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=HIVEP2","jax_strain_url":"https://www.jax.org/strain/search?query=HIVEP2"},"sequence":{"accession":"P31629","fasta_url":"https://rest.uniprot.org/uniprotkb/P31629.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P31629/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P31629"}},"corpus_meta":[{"pmid":"16580992","id":"PMC_16580992","title":"Schnurri-2 controls BMP-dependent adipogenesis via interaction with Smad proteins.","date":"2006","source":"Developmental cell","url":"https://pubmed.ncbi.nlm.nih.gov/16580992","citation_count":147,"is_preprint":false},{"pmid":"23389689","id":"PMC_23389689","title":"Deficiency of schnurri-2, an MHC enhancer binding protein, induces mild chronic inflammation in the brain and confers molecular, neuronal, and behavioral phenotypes related to schizophrenia.","date":"2013","source":"Neuropsychopharmacology : official publication of the American College of Neuropsychopharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/23389689","citation_count":143,"is_preprint":false},{"pmid":"19448624","id":"PMC_19448624","title":"TGF-beta signalling is regulated by Schnurri-2-dependent nuclear translocation of CLIC4 and consequent stabilization of phospho-Smad2 and 3.","date":"2009","source":"Nature cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/19448624","citation_count":88,"is_preprint":false},{"pmid":"11668343","id":"PMC_11668343","title":"Murine Schnurri-2 is required for positive selection of thymocytes.","date":"2001","source":"Nature immunology","url":"https://pubmed.ncbi.nlm.nih.gov/11668343","citation_count":63,"is_preprint":false},{"pmid":"2022670","id":"PMC_2022670","title":"HIV-EP2, a new member of the gene family encoding the human immunodeficiency virus type 1 enhancer-binding protein. 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The protein contains a nuclear localization signal followed by a Ser/Thr-rich region, a metal-finger DNA-binding domain, and a cluster of acidic amino acids. Expression of HIV-EP2 mRNA is greatly induced by mitogen and phorbol ester treatment of Jurkat T cells.\",\n      \"method\": \"cDNA cloning, cross-hybridization, protein domain analysis, Northern blotting, DNA-binding characterization\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — cDNA cloning with DNA-binding characterization and domain mapping; single lab but multiple complementary methods\",\n      \"pmids\": [\"2022670\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"MIBP1 (rat ortholog of HIVEP2/MBP-2) binds sequence-specifically to a 9-bp sequence in rat c-myc intron 1 via its zinc finger regions, demonstrated by expression of a fusion protein in E. coli. The protein has two widely separated zinc finger regions each carrying C2H2 motifs.\",\n      \"method\": \"cDNA cloning, in vitro DNA-binding assay with bacterially expressed fusion protein, Northern blotting\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro binding assay with recombinant protein; single lab, sequence-specific binding demonstrated directly\",\n      \"pmids\": [\"7838722\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"MIBP1 (HIVEP2) and RFX1 associate in vivo to form a complex that binds to the EP element within hepatitis B virus enhancer I. The EP site alone can repress transcription of the SV40 promoter in a position- and orientation-independent manner, suggesting silencer function.\",\n      \"method\": \"Supershift assay with polyclonal antisera, DNA-protein complex analysis, transcriptional reporter assay\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — antibody-based identification of complex plus functional reporter assay; single lab, two orthogonal methods\",\n      \"pmids\": [\"8709229\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"MIBP1 (HIVEP2) and RFX1 can bind simultaneously, most likely as a heterodimer, to the NRE gamma subregion of the hepatitis B virus core promoter negative regulatory element, and this binding is required for the gene-suppressive activity of NRE gamma.\",\n      \"method\": \"DNA binding assay, mutagenesis of NRE gamma, gel mobility shift assay with RFX1 and MIBP1\",\n      \"journal\": \"Virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gel shift with mutation validation; single lab, binding and functional correlation established\",\n      \"pmids\": [\"9018153\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"MIBP1 (HIVEP2) interacts specifically with a TC-rich enhancer element in the SSTR-2 promoter and with the SEF-2 initiator-binding protein to enhance transcription from the basal SSTR-2 promoter. MIBP1 mRNA expression overlaps precisely with SSTR-2 expression in the frontal cortex and hippocampus.\",\n      \"method\": \"cDNA library screening, DNA binding assay, transcriptional co-activation assay, in situ hybridization, Northern blotting\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct DNA binding plus transcriptional assay plus in situ hybridization; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"10207097\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"MIBP1 (HIVEP2) and RFX1 are induced during retinoic acid-mediated granulocytic differentiation of HL60 cells. Both proteins are absent from undifferentiated HL60 cells and their induction is inversely correlated with down-regulation of c-myc levels, supporting a role for MIBP1 in silencing c-myc during differentiation.\",\n      \"method\": \"Immunoblot, gel mobility shift assay, retinoic acid differentiation assay, time-course analysis\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, correlative induction data without direct mechanistic dissection of MIBP1 function\",\n      \"pmids\": [\"10642512\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Shn-2 (HIVEP2) knockout mice exhibit severely defective positive selection of CD4+ and CD8+ T cells in the thymus, establishing that Shn-2 is required for the survival signals initiated by T cell receptor engagement during positive selection.\",\n      \"method\": \"Shn-2 knockout mouse model, flow cytometry of thymocyte populations\",\n      \"journal\": \"Nature immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KO mouse with specific immunological phenotype, defined cellular process; replicated in follow-up studies\",\n      \"pmids\": [\"11668343\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"MIBP1 (HIVEP2) represses c-myc transcription from the major promoter P2. MIBP1 physically interacts with the Ski-interacting protein (SKIP), confirmed by yeast two-hybrid, in vitro pull-down assay, and co-immunoprecipitation. The acidic region of MIBP1 interacts with the N-terminal half of SKIP. MIBP1 is highly expressed in post-mitotic neurons but not in immature neuroepithelium.\",\n      \"method\": \"Transcriptional reporter assay, yeast two-hybrid, in vitro pull-down, co-immunoprecipitation, in situ hybridization\",\n      \"journal\": \"Journal of biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP plus pull-down plus yeast two-hybrid; single lab with three orthogonal methods confirming SKIP interaction\",\n      \"pmids\": [\"11872163\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Shn-2 (HIVEP2)-deficient mice show dramatically enhanced differentiation of naive T cells into Th2 cells with constitutive activation of NF-κB and enhanced GATA3 induction. Shn-2 competes with p50 NF-κB for binding to a consensus NF-κB motif and inhibits NF-κB-driven promoter activity, establishing Shn-2 as a negative regulator of Th2 differentiation via NF-κB repression.\",\n      \"method\": \"Shn-2 KO mouse, in vitro Th1/Th2 differentiation assay, NF-κB binding competition assay, promoter reporter assay, flow cytometry\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — KO mouse with defined cellular phenotype, NF-κB binding competition, and promoter reporter assay; multiple orthogonal methods\",\n      \"pmids\": [\"15699073\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Shn-2 (HIVEP2) KO mice have reduced white adipose tissue and Shn-2-deficient mouse embryonic fibroblasts cannot efficiently differentiate into adipocytes. Shn-2 enters the nucleus upon BMP-2 stimulation and, in cooperation with Smad1/4 and C/EBPalpha, induces PPARgamma2 expression. Shn-2 directly interacts with both Smad1/4 and C/EBPalpha on the PPARgamma2 promoter.\",\n      \"method\": \"Shn-2 KO mouse, MEF differentiation assay, nuclear translocation imaging, co-immunoprecipitation, chromatin immunoprecipitation, reporter assay\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — KO mouse, MEF in vitro differentiation, nuclear translocation, direct protein interaction by Co-IP, and promoter ChIP; multiple orthogonal methods in one rigorous study\",\n      \"pmids\": [\"16580992\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Shn-2 (HIVEP2) KO mice exhibit hypersensitivity to stress, increased anxiety-like behavior, hyperactivity, and elevated stress-induced corticosterone levels. Basal and stress-induced c-Fos expression are decreased in Shn-2 KO mice, indicating a role for Shn-2 in regulating neuronal immediate-early gene expression and stress responses.\",\n      \"method\": \"Shn-2 KO mouse, behavioral testing, corticosterone measurement, immunohistochemistry for c-Fos\",\n      \"journal\": \"Brain research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO mouse with defined behavioral phenotype and molecular readout (c-Fos); single lab\",\n      \"pmids\": [\"16836985\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Shn-2 (HIVEP2) deficiency suppresses osteoblastic bone formation (reduced osterix, osteocalcin, mineralization) and osteoclastic bone resorption (reduced Nfatc1, c-fos, TRAP-positive cells). Shn-2 overexpression enhances osteocalcin promoter activity and BMP-dependent osteoblastic differentiation, placing Shn-2 as a positive regulator of transcription factors required for bone remodeling.\",\n      \"method\": \"Shn-2 KO mouse, bone histomorphometry, in vitro mineralization assay, promoter reporter assay, bone marrow cell culture\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — KO mouse plus overexpression plus promoter reporter; multiple orthogonal methods demonstrating bidirectional regulation\",\n      \"pmids\": [\"17311925\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Shn-2 (HIVEP2)-deficient effector Th1/Th2 cells have increased susceptibility to apoptosis associated with increased FasL expression, leading to failure in memory T cell generation. Shn-2 repression of NF-κB controls FasL expression and is required for cell survival during memory T cell formation.\",\n      \"method\": \"Shn-2 KO mouse, adoptive transfer, BrdU incorporation, apoptosis assay, CD69/FasL measurement, p65 NF-κB overexpression experiment\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — KO mouse, adoptive transfer, apoptosis assays, and NF-κB overexpression epistasis; multiple orthogonal methods\",\n      \"pmids\": [\"17404274\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"CLIC4 interacts with Schnurri-2 (HIVEP2) in the cytoplasm upon TGF-beta stimulation, and they co-translocate to the nucleus. In the nucleus, CLIC4 associates with phospho-Smad2 and phospho-Smad3, protecting them from dephosphorylation by nuclear phosphatases. In the absence of Schnurri-2, TGF-beta signaling is abrogated; direct nuclear targeting of CLIC4 rescues signaling and removes the requirement for Schnurri-2.\",\n      \"method\": \"Co-immunoprecipitation, nuclear fractionation, TGF-beta signaling assays, siRNA knockdown, nuclear targeting constructs, phospho-Smad immunoblot\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, fractionation, genetic rescue with nuclear-targeted CLIC4, and phospho-Smad protection assay; multiple orthogonal methods in one rigorous study\",\n      \"pmids\": [\"19448624\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Shn-2 (HIVEP2) functions downstream of TCR proximal signaling to dampen Bax activation and the mitochondrial death pathway in double-positive thymocytes. Shn-2-deficient DP thymocytes inappropriately undergo negative selection in response to positive-selecting signals. Shn-2 levels increase after TCR stimulation. Genetic ablation of TCR-induced death rescues positive selection in Shn-2-deficient mice.\",\n      \"method\": \"Shn-2 KO mouse, genetic epistasis (death pathway ablation cross), Bax activation assay, in vitro TCR stimulation, in vivo selection assays, flow cytometry\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — KO mouse with genetic epistasis rescue, Bax activation assay, and in vitro/in vivo selection assays; multiple orthogonal methods establishing pathway position\",\n      \"pmids\": [\"21475200\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Shn-2 (HIVEP2) deficiency in NK cells leads to decreased perforin and granzyme-B expression, reduced STAT5 phosphorylation, enhanced STAT3 phosphorylation and NF-κB p65 expression, and decreased surface activation markers (CD27, CD69, CD122), resulting in impaired NK cell cytotoxicity and spontaneous CD3-positive lymphoma development.\",\n      \"method\": \"Shn-2 KO mouse, cytotoxicity assay, immunoblot for perforin/granzyme-B, phospho-STAT analysis, flow cytometry\",\n      \"journal\": \"Leukemia & lymphoma\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO mouse with defined cellular functional phenotype and molecular signaling readouts; single lab\",\n      \"pmids\": [\"21936769\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"MIBP1 (HIVEP2) globally represses NF-κB target gene expression. MIBP1 binds to the NF-κB binding site and represses NF-κB-responsive promoter activity in reporter assays. Knockdown of endogenous MIBP1 upregulates NF-κB pathway genes. O-GlcNAc transferase (OGT) is a prominent MIBP1 binding partner identified by co-immunoprecipitation and mass spectrometry; a 154-amino acid region of MIBP1 is required for OGT binding and O-GlcNAcylation of MIBP1. O-GlcNAcylation attenuates MIBP1-mediated NF-κB repression.\",\n      \"method\": \"Microarray with GSEA, MIBP1 overexpression and knockdown, NF-κB reporter assay, Co-IP with mass spectrometry, deletion mutagenesis, luciferase assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP/MS identification of OGT interaction, deletion mutagenesis mapping, reporter assay with KD/OE, and genome-wide transcriptomics; multiple orthogonal methods in one study\",\n      \"pmids\": [\"22294689\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"HIVEP2 is expressed in both the cytoplasm and nuclei of dopaminergic neurons and can target the intronic sequence GTGGCTTTCT of SLC6A3 (DAT), thereby activating the SLC6A3 gene.\",\n      \"method\": \"Immunofluorescence localization, chromatin binding/transcriptional activation assay for SLC6A3 intronic target\",\n      \"journal\": \"Translational psychiatry\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, localization and transcriptional target reported but limited mechanistic dissection; abstract does not specify the method used to demonstrate activation\",\n      \"pmids\": [\"31586043\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Shn-2 (HIVEP2) is upregulated in the L4-L6 spinal cord segments following spared nerve injury. Knockdown of Shn-2 using lentivirus decreases GluN2D subunit and GluR1 levels in the spinal cord and alleviates mechanical allodynia, indicating Shn-2 promotes expression of excitatory glutamate receptor subunits and contributes to neuropathic pain.\",\n      \"method\": \"Spared nerve injury mouse model, lentiviral knockdown of Shn-2, immunoblot for GluN2D and GluR1, mechanical allodynia testing\",\n      \"journal\": \"Neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo knockdown with defined molecular and behavioral phenotype; single lab\",\n      \"pmids\": [\"35218885\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"HIVEP2 (Schnurri-2/MIBP1) is a large zinc-finger transcription factor that (1) binds κB/NF-κB motifs to repress NF-κB-driven gene expression, with O-GlcNAcylation by OGT attenuating this repression; (2) translocates to the nucleus upon BMP-2 stimulation and cooperates with Smad1/4 and C/EBPα to induce PPARγ2, driving adipogenesis; (3) forms a cytoplasmic complex with CLIC4 that translocates to the nucleus in response to TGF-β, where CLIC4 protects phospho-Smad2/3 from dephosphorylation to sustain TGF-β signaling; (4) dampens Bax activation and the mitochondrial apoptotic pathway downstream of TCR signaling to enable positive selection of thymocytes; (5) interacts with SKIP via its acidic region to repress c-myc transcription; and (6) regulates expression of excitatory glutamate receptor subunits (GluN2D, GluR1) in spinal cord neurons, contributing to neuropathic pain.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"HIVEP2 (Schnurri-2/MIBP1) is a large zinc-finger transcription factor that governs cell fate and survival decisions by acting as a context-dependent transcriptional repressor and a signal-responsive cofactor [#0, #8]. Through its C2H2 zinc-finger DNA-binding domain it engages specific sequence elements, including the HIV-1 enhancer and an intronic site in c-myc [#0, #1], and it represses transcription by binding κB/NF-κB motifs in direct competition with p50 NF-κB, thereby globally dampening NF-κB-driven gene expression [#8, #16]; this repression is attenuated by O-GlcNAcylation catalyzed by its binding partner OGT [#16]. Its repressor functions extend to silencing c-myc, where it acts through physical interaction with the Ski-interacting protein SKIP via its acidic region [#7], and it can also partner with RFX1 to bind viral negative-regulatory elements [#2, #3]. HIVEP2 additionally serves as a nuclear signal integrator: upon BMP-2 stimulation it translocates to the nucleus and cooperates with Smad1/4 and C/EBPα on the PPARγ2 promoter to drive adipogenesis and bone remodeling [#9, #11], and upon TGF-β stimulation it forms a cytoplasmic complex with CLIC4 that co-translocates to the nucleus to sustain phospho-Smad2/3 signaling [#13]. In the immune system, Schnurri-2 enables positive selection of thymocytes by dampening TCR-induced Bax activation and the mitochondrial death pathway [#14], suppresses Th2 differentiation and supports memory T-cell survival through NF-κB repression [#8, #12], and is required for NK-cell cytotoxic effector function [#15]. In the nervous system it regulates immediate-early and neurotransmitter-related gene programs, influencing stress behavior and contributing to neuropathic pain through control of excitatory glutamate receptor subunit expression [#10, #18].\",\n  \"teleology\": [\n    {\n      \"year\": 1991,\n      \"claim\": \"Established HIVEP2 as a large metal/zinc-finger DNA-binding protein, defining its modular architecture and its inducibility in activated T cells.\",\n      \"evidence\": \"cDNA cloning, domain analysis, and DNA-binding characterization on the HIV-1 enhancer in Jurkat T cells\",\n      \"pmids\": [\"2022670\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No in vivo function established\", \"Target genes beyond the HIV-1 enhancer not defined\", \"Mechanism of transcriptional effect (activation vs repression) unresolved\"]\n    },\n    {\n      \"year\": 1994,\n      \"claim\": \"Demonstrated sequence-specific DNA recognition by the zinc fingers at a defined c-myc intronic element, linking HIVEP2 to a specific cellular target gene.\",\n      \"evidence\": \"In vitro DNA-binding assay with bacterially expressed fusion protein on rat c-myc intron 1\",\n      \"pmids\": [\"7838722\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional transcriptional consequence not yet shown\", \"No cellular validation of binding\", \"Cofactor requirements unknown\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Showed HIVEP2 partners with RFX1 to occupy viral regulatory elements and confer silencer activity, introducing a cofactor-dependent repression mechanism.\",\n      \"evidence\": \"Supershift and reporter assays on the HBV enhancer EP element\",\n      \"pmids\": [\"8709229\", \"9018153\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Stoichiometry and heterodimer interface not defined\", \"Generality beyond viral promoters unclear\", \"Cellular targets not identified\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Revealed that HIVEP2 can also act as a transcriptional activator at a cellular promoter, indicating context-dependent regulatory output.\",\n      \"evidence\": \"DNA binding, co-activation reporter assay with SEF-2, and in situ hybridization for SSTR-2 in brain\",\n      \"pmids\": [\"10207097\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Switch between activation and repression not mechanistically explained\", \"No in vivo validation of SSTR-2 regulation\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Identified SKIP as a direct repression cofactor binding the acidic region, providing a molecular basis for c-myc silencing.\",\n      \"evidence\": \"Yeast two-hybrid, in vitro pull-down, reciprocal Co-IP, and reporter assay; in situ hybridization in neurons\",\n      \"pmids\": [\"11872163\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether SKIP recruitment generalizes to other repressed genes unknown\", \"Structural basis of the acidic-region/SKIP interaction undefined\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Established an essential in vivo role: HIVEP2 is required for positive selection of thymocytes downstream of TCR engagement.\",\n      \"evidence\": \"Schnurri-2 knockout mouse with thymocyte flow cytometry\",\n      \"pmids\": [\"11668343\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism of the survival signal not yet defined at this stage\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Defined the core repressive mechanism in immunity: HIVEP2 competes with p50 NF-κB for the κB motif to restrain NF-κB-driven Th2 differentiation.\",\n      \"evidence\": \"KO mouse, in vitro Th differentiation, NF-κB binding competition and promoter reporter assays\",\n      \"pmids\": [\"15699073\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Genome-wide scope of NF-κB target repression not assessed here\", \"Regulation of HIVEP2 occupancy in response to signals unclear\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Established HIVEP2 as a BMP-2-responsive nuclear cofactor that cooperates with Smad1/4 and C/EBPα to induce PPARγ2 and drive adipogenesis.\",\n      \"evidence\": \"KO mouse, MEF differentiation, nuclear translocation imaging, Co-IP, and ChIP on the PPARγ2 promoter\",\n      \"pmids\": [\"16580992\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Signal that triggers nuclear entry mechanistically undefined\", \"How the same factor switches between NF-κB repression and Smad coactivation unresolved\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Extended HIVEP2 function to the nervous system, linking it to immediate-early gene (c-Fos) regulation and stress behavior.\",\n      \"evidence\": \"KO mouse behavioral testing, corticosterone measurement, and c-Fos immunohistochemistry\",\n      \"pmids\": [\"16836985\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct transcriptional targets in neurons not identified\", \"Link between c-Fos changes and behavior correlative\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Showed bidirectional control of bone remodeling, positioning HIVEP2 as a positive regulator of osteoblastic and osteoclastic transcription programs.\",\n      \"evidence\": \"KO mouse, bone histomorphometry, in vitro mineralization, and osteocalcin promoter reporter with overexpression\",\n      \"pmids\": [\"17311925\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct versus indirect effects on osteoclast genes not separated\", \"Relationship to BMP/Smad cooperation in bone not fully resolved\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Connected NF-κB repression to T-cell survival, showing HIVEP2 controls FasL expression to permit memory T-cell formation.\",\n      \"evidence\": \"KO mouse, adoptive transfer, apoptosis assays, and p65 NF-κB overexpression epistasis\",\n      \"pmids\": [\"17404274\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether FasL is a direct HIVEP2/NF-κB target gene not shown directly\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Defined a cytoplasmic-to-nuclear signaling role: HIVEP2 chaperones CLIC4 to the nucleus to protect phospho-Smad2/3 and sustain TGF-β signaling.\",\n      \"evidence\": \"Reciprocal Co-IP, nuclear fractionation, siRNA knockdown, nuclear-targeting rescue, and phospho-Smad protection assays\",\n      \"pmids\": [\"19448624\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How TGF-β triggers the cytoplasmic CLIC4-HIVEP2 complex unclear\", \"Relationship between this TGF-β role and the BMP/Smad1/4 role not integrated\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Resolved the mechanism of positive selection: HIVEP2 dampens TCR-induced Bax activation and the mitochondrial death pathway in thymocytes.\",\n      \"evidence\": \"KO mouse with genetic epistasis (death-pathway ablation rescue), Bax activation assay, and in vivo/in vitro selection assays\",\n      \"pmids\": [\"21475200\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Transcriptional targets mediating Bax restraint not identified\", \"Link to NF-κB repression in this context not established\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Extended HIVEP2 immune function to NK cells, linking its loss to cytotoxic defects, altered STAT/NF-κB signaling, and lymphomagenesis.\",\n      \"evidence\": \"KO mouse cytotoxicity assays, perforin/granzyme-B immunoblot, and phospho-STAT/flow cytometry\",\n      \"pmids\": [\"21936769\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct transcriptional targets in NK cells undefined\", \"Causal chain from signaling changes to lymphoma not established\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Established genome-wide NF-κB repression and uncovered O-GlcNAcylation by OGT as a regulatory switch attenuating that repression.\",\n      \"evidence\": \"Microarray/GSEA with overexpression and knockdown, NF-κB reporter, Co-IP/mass spectrometry of OGT, and deletion mutagenesis mapping the OGT-binding region\",\n      \"pmids\": [\"22294689\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific O-GlcNAc-modified residues not mapped\", \"Whether O-GlcNAcylation alters DNA binding or cofactor recruitment unresolved\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Linked HIVEP2 to dopaminergic neuron gene regulation through activation of the SLC6A3 (DAT) gene.\",\n      \"evidence\": \"Immunofluorescence localization and transcriptional targeting of an SLC6A3 intronic sequence\",\n      \"pmids\": [\"31586043\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Method of demonstrating activation not specified\", \"Direct binding versus indirect effect not distinguished\", \"Single lab, limited mechanistic dissection\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Implicated HIVEP2 in neuropathic pain by showing it promotes excitatory glutamate receptor subunit expression in spinal cord.\",\n      \"evidence\": \"Spared nerve injury model with lentiviral Shn-2 knockdown, GluN2D/GluR1 immunoblot, and mechanical allodynia testing\",\n      \"pmids\": [\"35218885\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct transcriptional regulation of GluN2D/GluR1 not shown\", \"Cell-type specificity in spinal cord undefined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How a single factor toggles between NF-κB/SKIP-mediated repression and Smad/C/EBPα-mediated activation, and how post-translational modification and partner availability direct this switch across tissues, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural model of the DNA-binding or acidic regions\", \"Direct genome-wide target maps in neurons and bone lacking\", \"Mechanism coordinating cytoplasmic CLIC4 complex versus nuclear repressor pools unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 8, 9, 16]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [0, 1, 8, 16]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [13, 7]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 9, 13]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [13, 17]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [6, 8, 12, 14]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [9, 13]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [7, 8, 16]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [9, 11]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [12, 14]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"RFX1\", \"SKIP\", \"OGT\", \"SMAD1\", \"SMAD4\", \"CEBPA\", \"CLIC4\", \"NFKB1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"tie","faith_supported":6,"faith_total":6,"faith_pct":100.0}}