{"gene":"DAZAP2","run_date":"2026-04-28T17:28:53","timeline":{"discoveries":[{"year":2009,"finding":"DAZAP2 interacts with TCF-4 (and all TCF/LEF family members) via a short region proximal to the TCF-4 HMG box, modulates TCF-4 affinity for its DNA-recognition motif, and knockdown of DAZAP2 reduces Wnt/beta-catenin transcriptional reporter activity and alters Wnt target gene expression.","method":"Co-immunoprecipitation, deletion mapping, chromatin immunoprecipitation (ChIP), siRNA knockdown with reporter assays","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP, domain mapping, ChIP, and functional knockdown with multiple orthogonal readouts in a single study","pmids":["19304756"],"is_preprint":false},{"year":2015,"finding":"DAZAP2 binds the IL-25 receptor (IL-17RB) and acts as an inhibitor of ACT1/IL-25R interaction; upon IL-25 stimulation, TRAF4 recruits the E3 ligase SMURF2 to polyubiquitinate and degrade DAZAP2, thereby enabling ACT1 to associate with IL-25R and initiate downstream signaling.","method":"Genetic knockout mice (Traf4−/−), siRNA knockdown, co-immunoprecipitation, in vivo cytokine/eosinophil measurements","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 2 — KO mouse model, reciprocal Co-IP, and multiple functional readouts across independent cell types","pmids":["25681341"],"is_preprint":false},{"year":2011,"finding":"DAZAP2 directly binds the cytoplasmic domain of IL-17RB (between aa 329–347) via its SH2-binding domains; SMURF2 (E3 ubiquitin ligase) interacts with DAZAP2 and mediates its proteasome-dependent degradation; IL-17E stimulation induces cytoplasmic accumulation of DAZAP2.","method":"Yeast two-hybrid screening, deletion mutagenesis (tyrosine-to-alanine substitutions), confocal microscopy, co-immunoprecipitation","journal":"Immunobiology","confidence":"Medium","confidence_rationale":"Tier 2/3 — yeast two-hybrid plus mutagenesis and localization, single lab","pmids":["22070932"],"is_preprint":false},{"year":2021,"finding":"In unstressed cells, DAZAP2 promotes HIPK2 polyubiquitination and proteasomal degradation through interplay with the E3 ubiquitin ligase SIAH1; upon DNA damage, HIPK2 site-specifically phosphorylates DAZAP2, terminating its HIPK2-degrading activity and triggering DAZAP2 re-localization to the nucleus where it interacts with p53 and co-occupies p53 response elements to modulate a specific subset of p53 target genes.","method":"siRNA knockdown, CRISPR deletion, ubiquitination assays, phosphorylation assays, co-immunoprecipitation, chromatin immunoprecipitation, mouse xenograft model","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1–2 — multiple orthogonal methods (ubiquitination, phosphorylation, ChIP, Co-IP, in vivo xenograft), replicated across cell and animal models","pmids":["33591310"],"is_preprint":false},{"year":2009,"finding":"In Xenopus embryos, Dazap2 is required downstream of FGF receptor activation for posterior neural patterning (hoxb9 expression), acting in a branch independent of Cdx and canonical Wnt signaling.","method":"Morpholino knockdown in Xenopus embryos, epistasis analysis (FGF, Wnt, Cdx pathway perturbations), in situ hybridization for neural markers","journal":"Developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 — genetic epistasis with multiple pathway perturbations in Xenopus, single lab","pmids":["19555680"],"is_preprint":false},{"year":2015,"finding":"In zebrafish, maternal Dazap2 (MDazap2) binds Bucky ball (an essential regulator of oocyte polarity and germ plasm assembly), co-localizes with germ plasm in oocytes and primordial germ cells, and is required to maintain germ granules in primordial germ cells by counteracting Dynein activity; MDazap2 is epistatic to Tdrd7 in this process.","method":"Genetic mutant analysis, co-immunoprecipitation (Dazap2–Bucky ball interaction), molecular epistasis (Tdrd7, Dynein), confocal microscopy","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 — genetic epistasis plus Co-IP and live imaging, single lab in zebrafish ortholog","pmids":["26119733"],"is_preprint":false},{"year":2019,"finding":"The p38/MAPK signaling pathway drives DAZAP2 expression by phosphorylating CREB, which binds the DAZAP2 promoter CpG island 2; hypermethylation of the CREB binding motif blocks CREB binding and silences DAZAP2 expression in multiple myeloma cells; demethylation with 5-aza-2'-deoxycytidine restores CREB binding and DAZAP2 expression.","method":"Bisulfite genomic sequencing, luciferase reporter assays, ChIP for CREB, p38 inhibition/activation, 5-aza-2'-deoxycytidine treatment","journal":"Cellular signalling","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP plus functional reporter and pharmacological rescue, single lab","pmids":["31034872"],"is_preprint":false},{"year":2004,"finding":"DAZAP2 protein is predominantly localized in the cytoplasm with a discrete punctuated distribution pattern, as determined by confocal microscopy in transfected cells.","method":"Confocal microscopy of EGFP-DAZAP2 fusion protein in transfected COS-7 cells","journal":"Genomics, proteomics & bioinformatics","confidence":"Low","confidence_rationale":"Tier 3 — single localization experiment without functional consequence demonstrated","pmids":["15629043"],"is_preprint":false},{"year":2025,"finding":"DAZAP2 functions as a pan-coronavirus restriction factor that inhibits SARS-CoV-2 entry by blocking virion fusion with endolysosomal and plasma membranes, and independently suppresses viral genomic RNA replication without affecting primary translation of viral replicases; knockout of DAZAP2 enhances SARS-CoV-2 infection in mouse models and human primary airway epithelial cells.","method":"Genome-wide CRISPR knockout screen, DAZAP2 KO in mouse models and primary human airway epithelial cells, viral entry/fusion assays, RNA replication assays","journal":"mBio","confidence":"High","confidence_rationale":"Tier 2 — genome-wide CRISPR screen, KO in vivo and primary cells, dual mechanistic readouts (entry and replication)","pmids":["40833112"],"is_preprint":false}],"current_model":"DAZAP2 is a multifunctional adaptor protein that (1) interacts with TCF/LEF transcription factors to modulate Wnt/beta-catenin target gene expression via chromatin occupancy, (2) promotes HIPK2 degradation via SIAH1 in unstressed cells, but upon DNA damage is phosphorylated by HIPK2, translocates to the nucleus, and co-occupies p53 response elements to specify p53 target gene expression, (3) acts as a negative regulator of IL-25/IL-17RB signaling that is relieved by TRAF4-SMURF2-mediated proteasomal degradation, (4) maintains germ granules in zebrafish primordial germ cells by counteracting Dynein downstream of Bucky ball, (5) mediates FGF-dependent posterior neural patterning downstream of FGF receptor activation in a Wnt/Cdx-independent manner, and (6) restricts coronavirus infection by blocking viral membrane fusion and suppressing genomic RNA replication."},"narrative":{"teleology":[{"year":2004,"claim":"Establishing that DAZAP2 protein resides predominantly in the cytoplasm with a punctate distribution set the stage for understanding it as a cytoplasmic signaling adaptor rather than a nuclear-resident factor.","evidence":"Confocal microscopy of EGFP-DAZAP2 in transfected COS-7 cells","pmids":["15629043"],"confidence":"Low","gaps":["Single overexpression system without endogenous antibody validation","No functional consequence of localization demonstrated","Punctate pattern not assigned to any organelle"]},{"year":2009,"claim":"Identification of DAZAP2 as a direct TCF/LEF-binding partner that occupies chromatin and modulates Wnt/β-catenin transcriptional activity established its first known nuclear function and linked it to a major developmental signaling pathway.","evidence":"Co-IP, deletion mapping, ChIP, and siRNA knockdown with Wnt reporter assays in human cells","pmids":["19304756"],"confidence":"High","gaps":["Structural basis of DAZAP2–TCF interaction not resolved","Whether DAZAP2 acts as a co-activator, co-repressor, or context-dependent modulator not fully delineated"]},{"year":2009,"claim":"Demonstration that Dazap2 acts downstream of FGF receptor activation for posterior neural patterning in Xenopus, independently of Wnt/Cdx, revealed a second signaling axis in which DAZAP2 participates during embryogenesis.","evidence":"Morpholino knockdown in Xenopus with epistasis analysis across FGF, Wnt, and Cdx pathways","pmids":["19555680"],"confidence":"Medium","gaps":["Direct FGF-pathway binding partner of Dazap2 not identified","Mammalian relevance of this FGF-dependent role unconfirmed"]},{"year":2011,"claim":"Discovery that DAZAP2 directly binds the IL-17RB cytoplasmic domain and is degraded by SMURF2 upon IL-17E stimulation revealed DAZAP2 as a negative checkpoint in IL-25 signaling, regulated by proteasomal turnover.","evidence":"Yeast two-hybrid, deletion mutagenesis, confocal microscopy, and co-IP","pmids":["22070932"],"confidence":"Medium","gaps":["SMURF2-mediated ubiquitination sites on DAZAP2 not mapped","Functional consequence of DAZAP2 loss on IL-25 downstream signaling not shown in this study"]},{"year":2015,"claim":"Validation in Traf4-knockout mice that TRAF4 recruits SMURF2 to degrade DAZAP2 and thereby relieve its inhibition of ACT1–IL-25R association provided in vivo confirmation of DAZAP2's gatekeeper role in type 2 immune signaling.","evidence":"Traf4−/− mice, siRNA, co-IP, in vivo cytokine and eosinophil measurements","pmids":["25681341"],"confidence":"High","gaps":["Whether DAZAP2 inhibition of IL-25R signaling operates in human disease settings not tested","Relative contribution of DAZAP2 versus other ACT1 regulators unclear"]},{"year":2015,"claim":"Identification of maternal Dazap2 as a Bucky ball-binding protein that maintains germ granules in primordial germ cells by counteracting Dynein expanded DAZAP2's roles to germ cell biology and RNA granule dynamics.","evidence":"Zebrafish genetic mutants, co-IP for Dazap2–Bucky ball, epistasis with Tdrd7 and Dynein, confocal imaging","pmids":["26119733"],"confidence":"Medium","gaps":["Biochemical mechanism by which Dazap2 antagonizes Dynein unknown","Conservation of germ-granule role in mammals not established"]},{"year":2019,"claim":"Elucidation that p38/MAPK–CREB drives DAZAP2 transcription and that promoter CpG methylation silences DAZAP2 in myeloma cells revealed an epigenetic layer controlling DAZAP2 expression in cancer.","evidence":"Bisulfite sequencing, luciferase reporters, ChIP for CREB, p38 inhibition, 5-aza-2'-deoxycytidine treatment in myeloma lines","pmids":["31034872"],"confidence":"Medium","gaps":["Functional consequence of DAZAP2 re-expression on myeloma cell behavior not demonstrated","Whether methylation-driven silencing occurs in other cancer types unknown"]},{"year":2021,"claim":"Discovery that DAZAP2 promotes HIPK2 degradation via SIAH1 in unstressed cells and, upon DNA damage, is phosphorylated by HIPK2 to switch from kinase destructor to p53 co-factor at chromatin established a feedback-driven, damage-responsive nuclear role for DAZAP2.","evidence":"siRNA, CRISPR KO, ubiquitination and phosphorylation assays, ChIP, co-IP, mouse xenograft model","pmids":["33591310"],"confidence":"High","gaps":["Specific HIPK2 phosphorylation sites on DAZAP2 that trigger nuclear translocation not fully characterized","Which p53 target genes are DAZAP2-dependent in physiological tissues remains limited to xenograft data"]},{"year":2025,"claim":"Genome-wide CRISPR screening and in vivo KO studies revealed DAZAP2 as a pan-coronavirus restriction factor that blocks viral membrane fusion at entry and independently suppresses genomic RNA replication, establishing a previously unrecognized innate antiviral function.","evidence":"CRISPR KO screen, DAZAP2 KO in mouse models and primary human airway epithelial cells, viral entry/fusion and RNA replication assays","pmids":["40833112"],"confidence":"High","gaps":["Molecular target on the viral machinery (spike, replicase) through which DAZAP2 acts not identified","Whether DAZAP2 restricts non-coronavirus RNA viruses is untested","Mechanism coupling membrane-fusion blockade and replication suppression unclear"]},{"year":null,"claim":"How DAZAP2 integrates its diverse adaptor functions — Wnt transcription, p53 specification, IL-25 inhibition, germ-granule maintenance, and antiviral restriction — through a single small protein with no recognized enzymatic domain remains an open mechanistic question.","evidence":"","pmids":[],"confidence":"Low","gaps":["No structural model of DAZAP2 or any of its complexes exists","Post-translational modification landscape beyond HIPK2 phosphorylation is uncharacterized","Whether distinct DAZAP2 pools are partitioned to different functions (e.g., by modifications or binding partners) is unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,1,2,3]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[1,3,8]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[7,2]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,3]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,1,2,4]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[1,2]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[3]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[8]}],"complexes":[],"partners":["TCF7L2","IL17RB","SMURF2","TRAF4","HIPK2","SIAH1","TP53","BUC"],"other_free_text":[]},"mechanistic_narrative":"DAZAP2 is a cytoplasmic adaptor protein that functions at the intersection of multiple signaling and transcriptional pathways by scaffolding protein–protein interactions and modulating protein turnover. In the Wnt pathway, DAZAP2 interacts with all TCF/LEF transcription factors, occupies chromatin at Wnt target loci, and is required for full Wnt/β-catenin transcriptional output [PMID:19304756]; in the DNA damage response, DAZAP2 promotes HIPK2 degradation via SIAH1 in unstressed cells but, upon DNA damage, is phosphorylated by HIPK2, translocates to the nucleus, and co-occupies p53 response elements to specify a subset of p53 target genes [PMID:33591310]. DAZAP2 negatively regulates IL-25/IL-17RB signaling by binding IL-17RB and blocking ACT1 recruitment, a brake relieved by TRAF4–SMURF2-mediated proteasomal degradation of DAZAP2 [PMID:25681341, PMID:22070932]. DAZAP2 also restricts pan-coronavirus infection by blocking viral membrane fusion and suppressing genomic RNA replication, as demonstrated by enhanced SARS-CoV-2 infection in DAZAP2-knockout mice and primary human airway cells [PMID:40833112]."},"prefetch_data":{"uniprot":{"accession":"Q15038","full_name":"DAZ-associated protein 2","aliases":["Deleted in azoospermia-associated protein 2","Proline-rich transcript in brain protein"],"length_aa":168,"mass_kda":17.3,"function":"In unstressed cells, promotes SIAH1-mediated polyubiquitination and degradation of the serine/threonine-protein kinase HIPK2, probably by acting as a loading factor that potentiates complex formation between HIPK2 and ubiquitin ligase SIAH1 (PubMed:33591310). In response to DNA damage, localizes to the nucleus following phosphorylation by HIPK2 and modulates the expression of a subset of TP53/p53 target genes by binding to TP53 at target gene promoters (PubMed:33591310). This limits the expression of a number of cell death-mediating TP53 target genes, reducing DNA damage-induced cell death (PubMed:33591310). Enhances the binding of transcription factor TCF7L2/TCF4, a Wnt signaling pathway effector, to the promoters of target genes (By similarity). Plays a role in stress granule formation (PubMed:17984221)","subcellular_location":"Cytoplasm; Nucleus; Nucleus speckle; Nucleus, nuclear body; Cytoplasm, Stress granule","url":"https://www.uniprot.org/uniprotkb/Q15038/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/DAZAP2","classification":"Not Classified","n_dependent_lines":5,"n_total_lines":1208,"dependency_fraction":0.0041390728476821195},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/DAZAP2","total_profiled":1310},"omim":[{"mim_id":"607431","title":"DAZ-ASSOCIATED PROTEIN 2; DAZAP2","url":"https://www.omim.org/entry/607431"},{"mim_id":"607430","title":"DAZ-ASSOCIATED PROTEIN 1; DAZAP1","url":"https://www.omim.org/entry/607430"},{"mim_id":"601486","title":"DELETED IN AZOOSPERMIA-LIKE; DAZL","url":"https://www.omim.org/entry/601486"},{"mim_id":"400003","title":"DELETED IN AZOOSPERMIA 1; DAZ1","url":"https://www.omim.org/entry/400003"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nuclear speckles","reliability":"Supported"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/DAZAP2"},"hgnc":{"alias_symbol":["KIAA0058"],"prev_symbol":[]},"alphafold":{"accession":"Q15038","domains":[{"cath_id":"-","chopping":"92-155","consensus_level":"medium","plddt":72.0495,"start":92,"end":155}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q15038","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q15038-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q15038-F1-predicted_aligned_error_v6.png","plddt_mean":58.59},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=DAZAP2","jax_strain_url":"https://www.jax.org/strain/search?query=DAZAP2"},"sequence":{"accession":"Q15038","fasta_url":"https://rest.uniprot.org/uniprotkb/Q15038.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q15038/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q15038"}},"corpus_meta":[{"pmid":"19304756","id":"PMC_19304756","title":"Dazap2 modulates transcription driven by the Wnt effector TCF-4.","date":"2009","source":"Nucleic acids research","url":"https://pubmed.ncbi.nlm.nih.gov/19304756","citation_count":31,"is_preprint":false},{"pmid":"25681341","id":"PMC_25681341","title":"TRAF4-SMURF2-mediated DAZAP2 degradation is critical for IL-25 signaling and allergic airway inflammation.","date":"2015","source":"Journal of immunology (Baltimore, Md. : 1950)","url":"https://pubmed.ncbi.nlm.nih.gov/25681341","citation_count":30,"is_preprint":false},{"pmid":"33591310","id":"PMC_33591310","title":"DAZAP2 acts as specifier of the p53 response to DNA damage.","date":"2021","source":"Nucleic acids research","url":"https://pubmed.ncbi.nlm.nih.gov/33591310","citation_count":15,"is_preprint":false},{"pmid":"22070932","id":"PMC_22070932","title":"Smurf2 regulates IL17RB by proteasomal degradation of its novel binding partner DAZAP2.","date":"2011","source":"Immunobiology","url":"https://pubmed.ncbi.nlm.nih.gov/22070932","citation_count":15,"is_preprint":false},{"pmid":"32490061","id":"PMC_32490061","title":"The hsa-miR-302 cluster controls ectodermal differentiation of human pluripotent stem cell via repression of DAZAP2.","date":"2020","source":"Regenerative therapy","url":"https://pubmed.ncbi.nlm.nih.gov/32490061","citation_count":14,"is_preprint":false},{"pmid":"15629043","id":"PMC_15629043","title":"The structure, expression and function prediction of DAZAP2, a down-regulated gene in multiple myeloma.","date":"2004","source":"Genomics, proteomics & bioinformatics","url":"https://pubmed.ncbi.nlm.nih.gov/15629043","citation_count":11,"is_preprint":false},{"pmid":"26119733","id":"PMC_26119733","title":"Maternal dazap2 Regulates Germ Granules by Counteracting Dynein in Zebrafish Primordial Germ Cells.","date":"2015","source":"Cell reports","url":"https://pubmed.ncbi.nlm.nih.gov/26119733","citation_count":8,"is_preprint":false},{"pmid":"17935665","id":"PMC_17935665","title":"Molecular features and expression of DAZAP2 in human multiple myeloma.","date":"2007","source":"Chinese medical journal","url":"https://pubmed.ncbi.nlm.nih.gov/17935665","citation_count":7,"is_preprint":false},{"pmid":"31034872","id":"PMC_31034872","title":"Promoter methylation induced epigenetic silencing of DAZAP2, a downstream effector of p38/MAPK pathway, in multiple myeloma cells.","date":"2019","source":"Cellular signalling","url":"https://pubmed.ncbi.nlm.nih.gov/31034872","citation_count":7,"is_preprint":false},{"pmid":"22792345","id":"PMC_22792345","title":"The effects of promoter methylation on downregulation of DAZAP2 in multiple myeloma cell lines.","date":"2012","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/22792345","citation_count":7,"is_preprint":false},{"pmid":"19555680","id":"PMC_19555680","title":"Dazap2 is required for FGF-mediated posterior neural patterning, independent of Wnt and Cdx function.","date":"2009","source":"Developmental biology","url":"https://pubmed.ncbi.nlm.nih.gov/19555680","citation_count":6,"is_preprint":false},{"pmid":"40833112","id":"PMC_40833112","title":"DAZAP2 functions as a pan-coronavirus restriction factor by inhibiting viral entry and genomic replication.","date":"2025","source":"mBio","url":"https://pubmed.ncbi.nlm.nih.gov/40833112","citation_count":3,"is_preprint":false},{"pmid":"42027905","id":"PMC_42027905","title":"Comprehensive analysis of the critical transcript function of the DAZAP2 gene in porcine testis.","date":"2026","source":"Archives animal breeding","url":"https://pubmed.ncbi.nlm.nih.gov/42027905","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":8035,"output_tokens":2412,"usd":0.030142},"stage2":{"model":"claude-opus-4-6","input_tokens":5716,"output_tokens":2645,"usd":0.142058},"total_usd":0.1722,"stage1_batch_id":"msgbatch_011kfMfE81o6CTcyhVUqumuW","stage2_batch_id":"msgbatch_01DTputS6WNkH745x1nVSoBo","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2009,\n      \"finding\": \"DAZAP2 interacts with TCF-4 (and all TCF/LEF family members) via a short region proximal to the TCF-4 HMG box, modulates TCF-4 affinity for its DNA-recognition motif, and knockdown of DAZAP2 reduces Wnt/beta-catenin transcriptional reporter activity and alters Wnt target gene expression.\",\n      \"method\": \"Co-immunoprecipitation, deletion mapping, chromatin immunoprecipitation (ChIP), siRNA knockdown with reporter assays\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP, domain mapping, ChIP, and functional knockdown with multiple orthogonal readouts in a single study\",\n      \"pmids\": [\"19304756\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"DAZAP2 binds the IL-25 receptor (IL-17RB) and acts as an inhibitor of ACT1/IL-25R interaction; upon IL-25 stimulation, TRAF4 recruits the E3 ligase SMURF2 to polyubiquitinate and degrade DAZAP2, thereby enabling ACT1 to associate with IL-25R and initiate downstream signaling.\",\n      \"method\": \"Genetic knockout mice (Traf4−/−), siRNA knockdown, co-immunoprecipitation, in vivo cytokine/eosinophil measurements\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — KO mouse model, reciprocal Co-IP, and multiple functional readouts across independent cell types\",\n      \"pmids\": [\"25681341\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"DAZAP2 directly binds the cytoplasmic domain of IL-17RB (between aa 329–347) via its SH2-binding domains; SMURF2 (E3 ubiquitin ligase) interacts with DAZAP2 and mediates its proteasome-dependent degradation; IL-17E stimulation induces cytoplasmic accumulation of DAZAP2.\",\n      \"method\": \"Yeast two-hybrid screening, deletion mutagenesis (tyrosine-to-alanine substitutions), confocal microscopy, co-immunoprecipitation\",\n      \"journal\": \"Immunobiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2/3 — yeast two-hybrid plus mutagenesis and localization, single lab\",\n      \"pmids\": [\"22070932\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"In unstressed cells, DAZAP2 promotes HIPK2 polyubiquitination and proteasomal degradation through interplay with the E3 ubiquitin ligase SIAH1; upon DNA damage, HIPK2 site-specifically phosphorylates DAZAP2, terminating its HIPK2-degrading activity and triggering DAZAP2 re-localization to the nucleus where it interacts with p53 and co-occupies p53 response elements to modulate a specific subset of p53 target genes.\",\n      \"method\": \"siRNA knockdown, CRISPR deletion, ubiquitination assays, phosphorylation assays, co-immunoprecipitation, chromatin immunoprecipitation, mouse xenograft model\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — multiple orthogonal methods (ubiquitination, phosphorylation, ChIP, Co-IP, in vivo xenograft), replicated across cell and animal models\",\n      \"pmids\": [\"33591310\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"In Xenopus embryos, Dazap2 is required downstream of FGF receptor activation for posterior neural patterning (hoxb9 expression), acting in a branch independent of Cdx and canonical Wnt signaling.\",\n      \"method\": \"Morpholino knockdown in Xenopus embryos, epistasis analysis (FGF, Wnt, Cdx pathway perturbations), in situ hybridization for neural markers\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis with multiple pathway perturbations in Xenopus, single lab\",\n      \"pmids\": [\"19555680\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"In zebrafish, maternal Dazap2 (MDazap2) binds Bucky ball (an essential regulator of oocyte polarity and germ plasm assembly), co-localizes with germ plasm in oocytes and primordial germ cells, and is required to maintain germ granules in primordial germ cells by counteracting Dynein activity; MDazap2 is epistatic to Tdrd7 in this process.\",\n      \"method\": \"Genetic mutant analysis, co-immunoprecipitation (Dazap2–Bucky ball interaction), molecular epistasis (Tdrd7, Dynein), confocal microscopy\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis plus Co-IP and live imaging, single lab in zebrafish ortholog\",\n      \"pmids\": [\"26119733\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"The p38/MAPK signaling pathway drives DAZAP2 expression by phosphorylating CREB, which binds the DAZAP2 promoter CpG island 2; hypermethylation of the CREB binding motif blocks CREB binding and silences DAZAP2 expression in multiple myeloma cells; demethylation with 5-aza-2'-deoxycytidine restores CREB binding and DAZAP2 expression.\",\n      \"method\": \"Bisulfite genomic sequencing, luciferase reporter assays, ChIP for CREB, p38 inhibition/activation, 5-aza-2'-deoxycytidine treatment\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP plus functional reporter and pharmacological rescue, single lab\",\n      \"pmids\": [\"31034872\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"DAZAP2 protein is predominantly localized in the cytoplasm with a discrete punctuated distribution pattern, as determined by confocal microscopy in transfected cells.\",\n      \"method\": \"Confocal microscopy of EGFP-DAZAP2 fusion protein in transfected COS-7 cells\",\n      \"journal\": \"Genomics, proteomics & bioinformatics\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single localization experiment without functional consequence demonstrated\",\n      \"pmids\": [\"15629043\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"DAZAP2 functions as a pan-coronavirus restriction factor that inhibits SARS-CoV-2 entry by blocking virion fusion with endolysosomal and plasma membranes, and independently suppresses viral genomic RNA replication without affecting primary translation of viral replicases; knockout of DAZAP2 enhances SARS-CoV-2 infection in mouse models and human primary airway epithelial cells.\",\n      \"method\": \"Genome-wide CRISPR knockout screen, DAZAP2 KO in mouse models and primary human airway epithelial cells, viral entry/fusion assays, RNA replication assays\",\n      \"journal\": \"mBio\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genome-wide CRISPR screen, KO in vivo and primary cells, dual mechanistic readouts (entry and replication)\",\n      \"pmids\": [\"40833112\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"DAZAP2 is a multifunctional adaptor protein that (1) interacts with TCF/LEF transcription factors to modulate Wnt/beta-catenin target gene expression via chromatin occupancy, (2) promotes HIPK2 degradation via SIAH1 in unstressed cells, but upon DNA damage is phosphorylated by HIPK2, translocates to the nucleus, and co-occupies p53 response elements to specify p53 target gene expression, (3) acts as a negative regulator of IL-25/IL-17RB signaling that is relieved by TRAF4-SMURF2-mediated proteasomal degradation, (4) maintains germ granules in zebrafish primordial germ cells by counteracting Dynein downstream of Bucky ball, (5) mediates FGF-dependent posterior neural patterning downstream of FGF receptor activation in a Wnt/Cdx-independent manner, and (6) restricts coronavirus infection by blocking viral membrane fusion and suppressing genomic RNA replication.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"DAZAP2 is a cytoplasmic adaptor protein that functions at the intersection of multiple signaling and transcriptional pathways by scaffolding protein–protein interactions and modulating protein turnover. In the Wnt pathway, DAZAP2 interacts with all TCF/LEF transcription factors, occupies chromatin at Wnt target loci, and is required for full Wnt/β-catenin transcriptional output [PMID:19304756]; in the DNA damage response, DAZAP2 promotes HIPK2 degradation via SIAH1 in unstressed cells but, upon DNA damage, is phosphorylated by HIPK2, translocates to the nucleus, and co-occupies p53 response elements to specify a subset of p53 target genes [PMID:33591310]. DAZAP2 negatively regulates IL-25/IL-17RB signaling by binding IL-17RB and blocking ACT1 recruitment, a brake relieved by TRAF4–SMURF2-mediated proteasomal degradation of DAZAP2 [PMID:25681341, PMID:22070932]. DAZAP2 also restricts pan-coronavirus infection by blocking viral membrane fusion and suppressing genomic RNA replication, as demonstrated by enhanced SARS-CoV-2 infection in DAZAP2-knockout mice and primary human airway cells [PMID:40833112].\",\n  \"teleology\": [\n    {\n      \"year\": 2004,\n      \"claim\": \"Establishing that DAZAP2 protein resides predominantly in the cytoplasm with a punctate distribution set the stage for understanding it as a cytoplasmic signaling adaptor rather than a nuclear-resident factor.\",\n      \"evidence\": \"Confocal microscopy of EGFP-DAZAP2 in transfected COS-7 cells\",\n      \"pmids\": [\"15629043\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Single overexpression system without endogenous antibody validation\", \"No functional consequence of localization demonstrated\", \"Punctate pattern not assigned to any organelle\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Identification of DAZAP2 as a direct TCF/LEF-binding partner that occupies chromatin and modulates Wnt/β-catenin transcriptional activity established its first known nuclear function and linked it to a major developmental signaling pathway.\",\n      \"evidence\": \"Co-IP, deletion mapping, ChIP, and siRNA knockdown with Wnt reporter assays in human cells\",\n      \"pmids\": [\"19304756\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of DAZAP2–TCF interaction not resolved\", \"Whether DAZAP2 acts as a co-activator, co-repressor, or context-dependent modulator not fully delineated\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Demonstration that Dazap2 acts downstream of FGF receptor activation for posterior neural patterning in Xenopus, independently of Wnt/Cdx, revealed a second signaling axis in which DAZAP2 participates during embryogenesis.\",\n      \"evidence\": \"Morpholino knockdown in Xenopus with epistasis analysis across FGF, Wnt, and Cdx pathways\",\n      \"pmids\": [\"19555680\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct FGF-pathway binding partner of Dazap2 not identified\", \"Mammalian relevance of this FGF-dependent role unconfirmed\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Discovery that DAZAP2 directly binds the IL-17RB cytoplasmic domain and is degraded by SMURF2 upon IL-17E stimulation revealed DAZAP2 as a negative checkpoint in IL-25 signaling, regulated by proteasomal turnover.\",\n      \"evidence\": \"Yeast two-hybrid, deletion mutagenesis, confocal microscopy, and co-IP\",\n      \"pmids\": [\"22070932\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"SMURF2-mediated ubiquitination sites on DAZAP2 not mapped\", \"Functional consequence of DAZAP2 loss on IL-25 downstream signaling not shown in this study\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Validation in Traf4-knockout mice that TRAF4 recruits SMURF2 to degrade DAZAP2 and thereby relieve its inhibition of ACT1–IL-25R association provided in vivo confirmation of DAZAP2's gatekeeper role in type 2 immune signaling.\",\n      \"evidence\": \"Traf4−/− mice, siRNA, co-IP, in vivo cytokine and eosinophil measurements\",\n      \"pmids\": [\"25681341\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether DAZAP2 inhibition of IL-25R signaling operates in human disease settings not tested\", \"Relative contribution of DAZAP2 versus other ACT1 regulators unclear\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Identification of maternal Dazap2 as a Bucky ball-binding protein that maintains germ granules in primordial germ cells by counteracting Dynein expanded DAZAP2's roles to germ cell biology and RNA granule dynamics.\",\n      \"evidence\": \"Zebrafish genetic mutants, co-IP for Dazap2–Bucky ball, epistasis with Tdrd7 and Dynein, confocal imaging\",\n      \"pmids\": [\"26119733\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Biochemical mechanism by which Dazap2 antagonizes Dynein unknown\", \"Conservation of germ-granule role in mammals not established\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Elucidation that p38/MAPK–CREB drives DAZAP2 transcription and that promoter CpG methylation silences DAZAP2 in myeloma cells revealed an epigenetic layer controlling DAZAP2 expression in cancer.\",\n      \"evidence\": \"Bisulfite sequencing, luciferase reporters, ChIP for CREB, p38 inhibition, 5-aza-2'-deoxycytidine treatment in myeloma lines\",\n      \"pmids\": [\"31034872\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of DAZAP2 re-expression on myeloma cell behavior not demonstrated\", \"Whether methylation-driven silencing occurs in other cancer types unknown\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Discovery that DAZAP2 promotes HIPK2 degradation via SIAH1 in unstressed cells and, upon DNA damage, is phosphorylated by HIPK2 to switch from kinase destructor to p53 co-factor at chromatin established a feedback-driven, damage-responsive nuclear role for DAZAP2.\",\n      \"evidence\": \"siRNA, CRISPR KO, ubiquitination and phosphorylation assays, ChIP, co-IP, mouse xenograft model\",\n      \"pmids\": [\"33591310\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific HIPK2 phosphorylation sites on DAZAP2 that trigger nuclear translocation not fully characterized\", \"Which p53 target genes are DAZAP2-dependent in physiological tissues remains limited to xenograft data\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Genome-wide CRISPR screening and in vivo KO studies revealed DAZAP2 as a pan-coronavirus restriction factor that blocks viral membrane fusion at entry and independently suppresses genomic RNA replication, establishing a previously unrecognized innate antiviral function.\",\n      \"evidence\": \"CRISPR KO screen, DAZAP2 KO in mouse models and primary human airway epithelial cells, viral entry/fusion and RNA replication assays\",\n      \"pmids\": [\"40833112\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular target on the viral machinery (spike, replicase) through which DAZAP2 acts not identified\", \"Whether DAZAP2 restricts non-coronavirus RNA viruses is untested\", \"Mechanism coupling membrane-fusion blockade and replication suppression unclear\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How DAZAP2 integrates its diverse adaptor functions — Wnt transcription, p53 specification, IL-25 inhibition, germ-granule maintenance, and antiviral restriction — through a single small protein with no recognized enzymatic domain remains an open mechanistic question.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No structural model of DAZAP2 or any of its complexes exists\", \"Post-translational modification landscape beyond HIPK2 phosphorylation is uncharacterized\", \"Whether distinct DAZAP2 pools are partitioned to different functions (e.g., by modifications or binding partners) is unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 1, 2, 3]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [1, 3, 8]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [7, 2]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 3]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 1, 2, 4]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [1, 2]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [3]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [8]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"TCF7L2\", \"IL17RB\", \"SMURF2\", \"TRAF4\", \"HIPK2\", \"SIAH1\", \"TP53\", \"Buc\"],\n    \"other_free_text\": []\n  }\n}\n```"}