{"gene":"DEDD","run_date":"2026-04-28T17:46:02","timeline":{"discoveries":[{"year":1998,"finding":"DEDD contains an N-terminal death effector domain (DED) through which it interacts with FADD and caspase-8; endogenous DEDD resides in the cytoplasm and translocates to the nucleus/nucleolus upon CD95 stimulation, where it co-localizes with UBF; recombinant DEDD binds DNA and reconstituted mononucleosomes and inhibits RNA polymerase I transcription in a reconstituted in vitro system; overexpression induces apoptosis primarily through its DED.","method":"Co-immunoprecipitation, immunofluorescence/co-localization with UBF, in vitro transcription reconstitution assay, DNA/nucleosome binding assay, overexpression apoptosis assay","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1-2 — multiple orthogonal methods including in vitro reconstitution, binding assays, and cell biology in a single foundational study","pmids":["9774341"],"is_preprint":false},{"year":2001,"finding":"Nuclear/nucleolar localization of DEDD is required for its apoptotic activity; DEDD activates caspase-6 through its DED domain; DEDD specifically inhibits RNA polymerase I-dependent transcription in vivo (blocking BrUTP incorporation); the DED alone is sufficient for DNA binding, caspase-6 activation, and Pol I transcriptional repression; mutation of all three nuclear localization signals (NLS) abolishes nuclear targeting and apoptosis induction.","method":"BrUTP incorporation assay (in vivo Pol I transcription), immunofluorescence with anti-DEDD antibody, NLS mutagenesis, caspase-6 activity assay, cytoplasmic DEDD (DEDD-ΔNLS1-3) functional analysis","journal":"Cell death and differentiation","confidence":"High","confidence_rationale":"Tier 1-2 — multiple orthogonal methods (in vivo transcription assay, mutagenesis, localization) in a single study with functional validation","pmids":["11753564"],"is_preprint":false},{"year":2002,"finding":"Diubiquitinated DEDD interacts with the K8/18 intermediate filament network and pro-caspase-3; early in apoptosis, DEDD and DEDD2 form filaments co-localizing with K8/18 in a caspase-3-dependent manner; these structures collapse into inclusions containing active caspase-3 and cleaved K18; cytosolic DEDD (DEDD-ΔNLS1-3) inhibits caspase-3 activation and K18 cleavage; siRNA-mediated DEDD knockdown inhibits staurosporine-induced DNA degradation; DEDD functions as a scaffold directing effector caspase-3 to specific substrates.","method":"Co-immunoprecipitation (DEDD with K18 and pro-caspase-3), immunofluorescence, siRNA knockdown, biochemical kinetics of caspase-3 activation and K18 cleavage","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 — reciprocal co-IP plus functional KD/KO with defined cellular phenotype and kinetic analysis","pmids":["12235123"],"is_preprint":false},{"year":2002,"finding":"DEDD interacts with the TFIIIC102 subunit of human transcription factor TFIIIC via its DED domain; co-expression of DEDD with hTFIIIC102 causes translocation of hTFIIIC102 to the nucleus; overexpression of DEDD inhibits NF-κB promoter-driven luciferase expression.","method":"Yeast two-hybrid identification of TFIIIC102 as DEDD interactor, co-immunoprecipitation, co-localization immunofluorescence, luciferase reporter assay","journal":"Cell death and differentiation","confidence":"Medium","confidence_rationale":"Tier 2-3 — yeast two-hybrid plus co-IP and reporter assay, single lab","pmids":["11965497"],"is_preprint":false},{"year":2003,"finding":"DEDD and DEDD2 bind to caspase-8 and caspase-10 (tandem DED-containing caspases) and to each other and to each other's homologue; nuclear localization is required for DEDD/DEDD2-induced apoptosis; both the N-terminal DED and C-terminal region of DEDD2 can independently induce apoptosis.","method":"Co-immunoprecipitation/binding assays, deletion analysis, overexpression apoptosis assay in various cell types","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2-3 — co-IP binding plus deletion analysis, single lab with multiple cell types","pmids":["12527898"],"is_preprint":false},{"year":2005,"finding":"DEDD exists in non-, mono-, and diubiquitinated forms; monoubiquitination relocates DEDD from the nucleolus to the cytosol; a central region (aa 109–305) outside the DED is required for ubiquitination; cIAP-1 and cIAP-2 can catalyze both mono- and polyubiquitination of DEDD; fusion of ubiquitin to DEDD C-terminus (mimicking monoubiquitinated DEDD) increases its pro-apoptotic potential.","method":"Ubiquitin-DEDD fusion construct, mutagenesis of lysine residues, co-transfection with cIAP-1/2, immunofluorescence localization, apoptosis assay","journal":"Apoptosis","confidence":"Medium","confidence_rationale":"Tier 2 — mutagenesis and functional ubiquitin fusion experiments, single lab","pmids":["16235027"],"is_preprint":false},{"year":2007,"finding":"DEDD associates with the mitotic Cdk1/cyclin B1 complex via direct binding to cyclin B1 and inhibits its kinase activity; DEDD-null embryonic fibroblasts show increased nuclear Cdk1/cyclin B1 kinase activity, accelerated mitotic progression, and shortened G2/M; DEDD-/- mice display decreased body and organ weights; absence of DEDD reduces rRNA amounts and cell volume due to rapid termination of rRNA synthesis before division.","method":"Co-immunoprecipitation (DEDD with Cdk1/cyclin B1), kinase activity assay in DEDD-/- vs. DEDD+/+ cells, DEDD-/- mouse model, cell cycle analysis","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1-2 — kinase assay plus genetic KO model with multiple phenotypic readouts and co-IP binding confirmation","pmids":["17283331"],"is_preprint":false},{"year":2008,"finding":"DEDD associates with S6K1 and supports S6K1 activity by preventing Cdk1-dependent inhibitory phosphorylation at the S6K1 C-terminus; DEDD-/- cells show reduced S6K1 activating phosphorylation (Thr-389) and increased inhibitory Cdk1-dependent phosphorylation; DEDD-/- mice show reduced pancreatic islet insulin mass and glucose intolerance, paralleling S6K1-/- phenotype.","method":"Co-immunoprecipitation (DEDD with S6K1), phosphorylation analysis in DEDD-/- cells/tissues, DEDD-/- mouse metabolic phenotyping, comparison with S6K1-/- mice","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — co-IP plus phosphorylation biochemistry in KO cells and in vivo mouse model with clear phenotype","pmids":["19106089"],"is_preprint":false},{"year":2009,"finding":"DEDD forms a complex with Akt and Hsp90 and supports the stability of both proteins; in DEDD-/- mice, Akt protein levels are diminished in skeletal muscle and adipose tissue, impairing GLUT4 translocation upon insulin stimulation; Cdk1 inhibition in DEDD-/- cells (via siRNA or inhibitor) restores Akt and Hsp90 levels, suggesting DEDD stabilizes Akt by suppressing Cdk1.","method":"Co-immunoprecipitation (DEDD with Akt and Hsp90), DEDD-/- mouse tissue analysis, Cdk1 siRNA knockdown, GLUT4 translocation assay","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 — co-IP plus in vivo KO phenotype and mechanistic rescue, single lab","pmids":["20043882"],"is_preprint":false},{"year":2010,"finding":"Female DEDD-/- mice are infertile due to defective uterine decidualization; DEDD-deficient decidual cells show attenuated polyploidization; DEDD associates with and stabilizes cyclin D3 (important for polyploidization); overexpression of cyclin D3 rescues polyploidization in DEDD-deficient cells; decreased Akt levels in DEDD-/- uteri contribute to defective decidualization, and Akt overexpression restores polyploidization.","method":"DEDD-/- mouse model (fertility and decidualization phenotype), co-immunoprecipitation (DEDD with cyclin D3), rescue by cyclin D3 or Akt overexpression, cell polyploidization assay","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 — in vivo KO phenotype with molecular rescue experiments and co-IP binding evidence, multiple orthogonal approaches","pmids":["21135503"],"is_preprint":false},{"year":2010,"finding":"DEDD physically interacts with Smad3 and inhibits TGF-β1/Smad3-mediated transcription by preventing Smad3 phosphorylation and nuclear translocation, reducing formation of the Smad3-Smad4 complex; DEDD inhibits TGF-β1-mediated cell invasion.","method":"Co-immunoprecipitation (DEDD with Smad3), immunofluorescence (Smad3 localization), reporter assay for Smad3 transcriptional activity, invasion assay","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2-3 — co-IP with functional reporter and invasion assay, single lab","pmids":["20553715"],"is_preprint":false},{"year":2012,"finding":"DEDD directly interacts with the PI3KC3 (PIK3C3)/Beclin1 complex and activates autophagy; the DEDD-PI3KC3 interaction stabilizes PI3KC3; this autophagy activation leads to lysosomal degradation of Snail and Twist (EMT master regulators), thereby attenuating epithelial-to-mesenchymal transition; DEDD overexpression suppresses invasion in vitro and metastasis in vivo while DEDD silencing promotes invasion.","method":"Co-immunoprecipitation (DEDD with PI3KC3/Beclin1), in vitro and in vivo invasion/metastasis assays, autophagy induction assay, Western blot for Snail/Twist degradation, siRNA knockdown","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 2 — co-IP plus both in vitro and in vivo functional assays with molecular mechanism defined, replicated in same study by multiple methods","pmids":["22719072"],"is_preprint":false},{"year":2013,"finding":"The N-terminal DED domain of DEDD is sufficient to inhibit TGF-β1-induced Smad3 nuclear translocation and Smad3-Smad4 complex formation; both full-length DEDD and its N-terminal (N-DEDD) and C-terminal (C-DEDD) truncation mutants can induce apoptosis and inhibit cell proliferation.","method":"Truncation mutant analysis, immunofluorescence, co-immunoprecipitation, flow cytometry (apoptosis), MTT assay (proliferation)","journal":"Yao xue xue bao = Acta pharmaceutica Sinica","confidence":"Medium","confidence_rationale":"Tier 2-3 — domain mapping with functional readouts, single lab","pmids":["23888690"],"is_preprint":false},{"year":2020,"finding":"DEDD interacts with and stabilizes Bcl-2 protein; DEDD knockdown downregulates Bcl-2 transcriptional activity and accelerates Bcl-2 degradation; DEDD expression levels are positively correlated with Bcl-2 in breast cancer cells; knockdown of DEDD causes drug resistance to doxorubicin and paclitaxel, while overexpression increases sensitivity.","method":"Co-immunoprecipitation (DEDD with Bcl-2), Western blot, luciferase-based transcription assay, drug sensitivity assay (MTT), siRNA knockdown and overexpression","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2-3 — co-IP with multiple functional readouts, single lab","pmids":["32113682"],"is_preprint":false},{"year":2025,"finding":"ZIPK (zipper-interacting protein kinase) binds to and phosphorylates DEDD at the S9 residue, enhancing DEDD stability and leading to activation of caspase-3-mediated apoptosis in neurons; ZIPK haploinsufficiency reduces neuronal apoptosis, DEDD upregulation, and caspase-3 activation after traumatic brain injury; pharmacological ZIPK inhibition prior to TBI prevents DEDD upregulation and caspase-3 activation.","method":"Co-immunoprecipitation (ZIPK with DEDD), phosphorylation mapping (S9 site), ZIPK haploinsufficiency mouse model, in vitro kinase assay, caspase-3 activity assay, pharmacological ZIPK inhibitor","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 — kinase assay with phosphosite mapping plus in vivo KO model, single lab","pmids":["40032841"],"is_preprint":false},{"year":2006,"finding":"DEDD co-purifies with CK18 in subcellular fractionation (Triton X-100 resistant fraction); mono- or diubiquitinated DEDD associates with K8/18 cytokeratin filaments; cells with filamentous DEDD distribution are more apoptosis-prone; DEDD is proposed to provide a scaffold for proximity-induced autocleavage and activation of procaspase-9 and -3 at the CK8/18 scaffold.","method":"Double immunofluorescence, Triton X-100 extraction and subcellular fractionation, co-purification with CK18, apoptosis sensitivity assay (M30 staining after roscovitine)","journal":"Apoptosis","confidence":"Medium","confidence_rationale":"Tier 2-3 — biochemical co-purification with functional correlation, single lab","pmids":["16820959"],"is_preprint":false},{"year":2006,"finding":"DEDDL, a longer human-specific isoform of DEDD produced by alternative splicing, is expressed in T lymphocytes and dendritic cells; DEDDL binds FADD and cFLIP more potently than DEDD in co-immunoprecipitation, and is a more potent apoptosis inducer than DEDD; both DEDD and DEDDL are substrates of active caspases.","method":"Co-immunoprecipitation (DEDDL vs. DEDD with FADD/cFLIP), overexpression apoptosis assay, RT-PCR expression analysis","journal":"Gene expression","confidence":"Low","confidence_rationale":"Tier 3 — single co-IP comparison plus overexpression, single lab, limited functional follow-up","pmids":["17193921"],"is_preprint":false}],"current_model":"DEDD is a ubiquitous, highly conserved death effector domain (DED)-containing protein that shuttles between the cytoplasm and nucleolus (regulated by monoubiquitination via cIAP-1/2) to coordinate apoptosis—acting as a scaffold that recruits pro-caspase-3 to the K8/18 intermediate filament network, interacting with FADD and caspase-8/10 via its DED, activating caspase-6 and inhibiting RNA Pol I transcription in the nucleolus, and suppressing epithelial-mesenchymal transition by binding PI3KC3/Beclin1 to activate autophagy-mediated degradation of Snail and Twist—while also regulating cell cycle and growth by directly inhibiting mitotic Cdk1/cyclin B1 kinase activity (via cyclin B1 binding), supporting S6K1 and Akt stability, and stabilizing cyclin D3 and Bcl-2; DEDD stability is itself controlled by ZIPK-mediated phosphorylation at S9."},"narrative":{"teleology":[{"year":1998,"claim":"Identification of DEDD as a DED-containing protein that interacts with FADD and caspase-8, translocates to the nucleolus upon death receptor signaling, binds DNA/nucleosomes, and directly inhibits RNA Pol I transcription established DEDD as a nuclear apoptosis effector linking death receptor signaling to transcriptional shutdown.","evidence":"Co-IP, immunofluorescence co-localization with UBF, in vitro Pol I transcription reconstitution, and DNA/nucleosome binding assays in human cells","pmids":["9774341"],"confidence":"High","gaps":["Identity of DEDD's nucleolar target beyond UBF co-localization not resolved","Endogenous stoichiometry of DEDD–FADD complex unclear","No structural data for DEDD-DED interactions"]},{"year":2001,"claim":"Demonstrating that all three NLS motifs are required for nuclear translocation and that the DED alone suffices for caspase-6 activation and Pol I repression established that DEDD's apoptotic function is nuclear and that its DED is the minimal functional unit for transcriptional inhibition.","evidence":"NLS mutagenesis (DEDD-ΔNLS1-3), BrUTP incorporation (in vivo Pol I activity), caspase-6 activity assay","pmids":["11753564"],"confidence":"High","gaps":["Direct Pol I subunit target not identified","How caspase-6 activation by DEDD DED is mechanistically achieved remains unresolved"]},{"year":2002,"claim":"Discovery that diubiquitinated DEDD scaffolds pro-caspase-3 to K8/18 intermediate filaments, directing effector caspase activation to specific substrates, revealed a non-nuclear cytoplasmic apoptotic function for DEDD as a spatial organizer of caspase activity.","evidence":"Reciprocal co-IP of DEDD with K18 and pro-caspase-3, siRNA knockdown blocking staurosporine-induced DNA degradation, kinetic analysis of caspase-3 activation","pmids":["12235123"],"confidence":"High","gaps":["Whether DEDD directly contacts both K18 and caspase-3 simultaneously or sequentially is unknown","Ubiquitin linkage type on DEDD not determined"]},{"year":2005,"claim":"Showing that cIAP-1/2-mediated monoubiquitination relocates DEDD from nucleolus to cytosol and that a ubiquitin-DEDD fusion enhances pro-apoptotic potential established ubiquitination as the switch governing DEDD's compartment-specific functions.","evidence":"Lysine mutagenesis, cIAP-1/2 co-transfection, ubiquitin-DEDD C-terminal fusion construct, immunofluorescence localization","pmids":["16235027"],"confidence":"Medium","gaps":["Specific lysine residue(s) ubiquitinated not pinpointed","No deubiquitinase identified","In vivo relevance of cIAP-mediated ubiquitination not tested in KO model"]},{"year":2007,"claim":"Demonstration that DEDD directly binds cyclin B1 and inhibits Cdk1/cyclin B1 kinase activity, with DEDD-knockout mice showing accelerated mitosis, reduced rRNA, and decreased body/organ size, revealed an unexpected cell-cycle regulatory role independent of apoptosis.","evidence":"Co-IP of DEDD with Cdk1/cyclin B1, kinase activity assay in DEDD−/− vs. wild-type MEFs, DEDD−/− mouse phenotyping including cell cycle analysis","pmids":["17283331"],"confidence":"High","gaps":["Binding interface between DEDD and cyclin B1 not mapped","Whether DEDD inhibits Cdk1 catalytically or by sequestering cyclin B1 is unresolved"]},{"year":2008,"claim":"Finding that DEDD associates with S6K1 and protects it from Cdk1-dependent inhibitory phosphorylation, with DEDD-knockout mice phenocopying S6K1 knockouts in glucose intolerance and reduced islet mass, connected DEDD's Cdk1 inhibition to growth/metabolic signaling via mTOR-S6K1.","evidence":"Co-IP of DEDD with S6K1, phosphorylation analysis (Thr-389 vs. Cdk1 sites) in DEDD−/− cells and tissues, metabolic phenotyping of DEDD−/− mice","pmids":["19106089"],"confidence":"High","gaps":["Whether DEDD–S6K1 interaction is direct or bridged by cyclin B1/Cdk1 not fully resolved","Tissue-specific requirements not mapped"]},{"year":2009,"claim":"Showing that DEDD complexes with Akt and Hsp90 and that Cdk1 inhibition restores Akt levels in DEDD−/− cells established that DEDD stabilizes Akt indirectly through Cdk1 suppression, explaining impaired insulin-stimulated GLUT4 translocation in knockout tissues.","evidence":"Co-IP of DEDD with Akt and Hsp90, DEDD−/− mouse skeletal muscle/adipose analysis, Cdk1 siRNA rescue of Akt levels, GLUT4 translocation assay","pmids":["20043882"],"confidence":"Medium","gaps":["Whether DEDD directly contacts Akt or only through Hsp90 not determined","Contribution of Hsp90 chaperone activity versus Cdk1 suppression not separated"]},{"year":2010,"claim":"Linking DEDD to cyclin D3 stabilization and Akt-dependent polyploidization during decidualization, with DEDD−/− female infertility rescued by cyclin D3 or Akt overexpression, demonstrated a physiological non-apoptotic role for DEDD in reproductive biology.","evidence":"DEDD−/− mouse fertility and decidualization analysis, co-IP of DEDD with cyclin D3, rescue by cyclin D3 or Akt overexpression, polyploidization assay","pmids":["21135503"],"confidence":"High","gaps":["Mechanism by which DEDD stabilizes cyclin D3 (proteasome protection vs. other) not defined","Whether male DEDD−/− fertility phenotypes exist not explored"]},{"year":2012,"claim":"Discovery that DEDD binds PI3KC3/Beclin1 to activate autophagy and promote lysosomal degradation of Snail and Twist, suppressing EMT and metastasis both in vitro and in vivo, established DEDD as a metastasis suppressor acting through autophagy.","evidence":"Co-IP of DEDD with PI3KC3/Beclin1, autophagy induction assay, invasion/metastasis assays in vitro and in vivo, Western blot for Snail/Twist degradation, siRNA knockdown","pmids":["22719072"],"confidence":"High","gaps":["Selectivity mechanism for Snail/Twist as autophagy cargo not identified","Whether DEDD activates PI3KC3 enzymatically or by stabilization not distinguished"]},{"year":2020,"claim":"Identification of DEDD as a stabilizer of Bcl-2 protein, with DEDD knockdown accelerating Bcl-2 degradation and altering drug sensitivity, added an anti-apoptotic regulatory dimension to DEDD's functions.","evidence":"Co-IP of DEDD with Bcl-2, siRNA knockdown and overexpression, drug sensitivity assays in breast cancer cells","pmids":["32113682"],"confidence":"Medium","gaps":["Mechanism of Bcl-2 stabilization (proteasomal vs. other) not determined","Paradox of a pro-apoptotic DED protein stabilizing anti-apoptotic Bcl-2 not reconciled","Single cell-type study"]},{"year":2025,"claim":"Demonstration that ZIPK phosphorylates DEDD at S9 to enhance its stability and promote caspase-3-dependent neuronal apoptosis after traumatic brain injury identified the first upstream kinase controlling DEDD protein levels.","evidence":"Co-IP and in vitro kinase assay (ZIPK–DEDD), S9 phosphosite mapping, ZIPK haploinsufficiency mouse model after TBI, pharmacological ZIPK inhibition","pmids":["40032841"],"confidence":"Medium","gaps":["Whether S9 phosphorylation affects DEDD ubiquitination or other post-translational modifications not tested","Generality beyond neuronal TBI context unknown","Single lab"]},{"year":null,"claim":"The structural basis for DEDD's multivalent scaffolding—simultaneously engaging Cdk1/cyclin B1, PI3KC3/Beclin1, caspase-3/K18, and Akt/Hsp90—and how cells select between DEDD's apoptotic versus growth-regulatory versus autophagy functions in a context-dependent manner remain unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No crystal or cryo-EM structure of DEDD or any DEDD complex","No systematic interactome under apoptotic vs. proliferative conditions","Regulatory logic integrating ubiquitination, phosphorylation, and localization not modeled"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[2,15]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[6,7,10]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[0]}],"localization":[{"term_id":"GO:0005730","term_label":"nucleolus","supporting_discovery_ids":[0,1,5]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,1]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[2,5,15]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[2,15]}],"pathway":[{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[0,1,2,14]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[6,7]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[11]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[7,8,10]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[0,1]}],"complexes":["Cdk1/cyclin B1","PI3KC3/Beclin1"],"partners":["FADD","CASP8","CASP3","KRT18","CDK1","CCNB1","RPS6KB1","AKT1"],"other_free_text":[]},"mechanistic_narrative":"DEDD is a death effector domain (DED)-containing scaffold protein that integrates apoptotic signaling, cell cycle control, and autophagy-mediated suppression of epithelial-mesenchymal transition. In apoptosis, DEDD interacts with FADD and caspase-8/10 via its DED, recruits pro-caspase-3 to keratin 8/18 intermediate filaments for proximity-induced activation, activates caspase-6, and inhibits RNA polymerase I transcription upon nucleolar translocation—a process regulated by cIAP-1/2-mediated monoubiquitination that shuttles DEDD between the nucleolus and cytoplasm [PMID:9774341, PMID:11753564, PMID:12235123, PMID:16235027]. Beyond apoptosis, DEDD directly binds and inhibits mitotic Cdk1/cyclin B1 kinase activity, thereby supporting S6K1 and Akt stability and controlling cell size and organ growth, as demonstrated by decreased body weight, glucose intolerance, and female infertility in DEDD-knockout mice [PMID:17283331, PMID:19106089, PMID:21135503]. DEDD also activates autophagy by binding the PI3KC3/Beclin1 complex, promoting lysosomal degradation of Snail and Twist to suppress invasion and metastasis, and its own stability is regulated by ZIPK-mediated phosphorylation at S9 [PMID:22719072, PMID:40032841]."},"prefetch_data":{"uniprot":{"accession":"O75618","full_name":"Death effector domain-containing protein","aliases":["DEDPro1","Death effector domain-containing testicular molecule","FLDED-1"],"length_aa":318,"mass_kda":36.8,"function":"A scaffold protein that directs CASP3 to certain substrates and facilitates their ordered degradation during apoptosis. May also play a role in mediating CASP3 cleavage of KRT18. Regulates degradation of intermediate filaments during apoptosis. May play a role in the general transcription machinery in the nucleus and might be an important regulator of the activity of GTF3C3. Inhibits DNA transcription in vitro (By similarity)","subcellular_location":"Cytoplasm; Nucleus, nucleolus","url":"https://www.uniprot.org/uniprotkb/O75618/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/DEDD","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/DEDD","total_profiled":1310},"omim":[{"mim_id":"619529","title":"PARN-LIKE RIBONUCLEASE DOMAIN-CONTAINING EXONUCLEASE 1; PNLDC1","url":"https://www.omim.org/entry/619529"},{"mim_id":"617078","title":"DEATH EFFECTOR DOMAIN-CONTAINING PROTEIN 2; DEDD2","url":"https://www.omim.org/entry/617078"},{"mim_id":"613931","title":"TARGET OF EGR1; TOE1","url":"https://www.omim.org/entry/613931"},{"mim_id":"608739","title":"EXORIBONUCLEASE 1; ERI1","url":"https://www.omim.org/entry/608739"},{"mim_id":"608299","title":"RING FINGER PROTEIN 34; RNF34","url":"https://www.omim.org/entry/608299"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"},{"location":"Nucleoli","reliability":"Approved"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/DEDD"},"hgnc":{"alias_symbol":["DEFT","FLDED1","CASP8IP1","KE05","DEDD1"],"prev_symbol":[]},"alphafold":{"accession":"O75618","domains":[{"cath_id":"1.10.533.10","chopping":"13-99","consensus_level":"high","plddt":89.2679,"start":13,"end":99},{"cath_id":"-","chopping":"192-315","consensus_level":"high","plddt":93.0598,"start":192,"end":315}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O75618","model_url":"https://alphafold.ebi.ac.uk/files/AF-O75618-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O75618-F1-predicted_aligned_error_v6.png","plddt_mean":77.25},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=DEDD","jax_strain_url":"https://www.jax.org/strain/search?query=DEDD"},"sequence":{"accession":"O75618","fasta_url":"https://rest.uniprot.org/uniprotkb/O75618.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O75618/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O75618"}},"corpus_meta":[{"pmid":"19684127","id":"PMC_19684127","title":"Self-enhanced accumulation of FtsN at Division Sites and Roles for Other Proteins with a SPOR domain (DamX, DedD, and RlpA) in Escherichia coli cell constriction.","date":"2009","source":"Journal of bacteriology","url":"https://pubmed.ncbi.nlm.nih.gov/19684127","citation_count":165,"is_preprint":false},{"pmid":"22719072","id":"PMC_22719072","title":"DEDD interacts with PI3KC3 to activate autophagy and attenuate epithelial-mesenchymal transition in human breast cancer.","date":"2012","source":"Cancer research","url":"https://pubmed.ncbi.nlm.nih.gov/22719072","citation_count":148,"is_preprint":false},{"pmid":"9774341","id":"PMC_9774341","title":"DEDD, a novel death effector domain-containing protein, targeted to the nucleolus.","date":"1998","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/9774341","citation_count":110,"is_preprint":false},{"pmid":"19880599","id":"PMC_19880599","title":"Discovery and characterization of three new Escherichia coli septal ring proteins that contain a SPOR domain: DamX, DedD, and RlpA.","date":"2010","source":"Journal of bacteriology","url":"https://pubmed.ncbi.nlm.nih.gov/19880599","citation_count":85,"is_preprint":false},{"pmid":"12235123","id":"PMC_12235123","title":"DEDD regulates degradation of intermediate filaments during apoptosis.","date":"2002","source":"The Journal of cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/12235123","citation_count":77,"is_preprint":false},{"pmid":"28000900","id":"PMC_28000900","title":"miR-24-3p regulates bladder cancer cell proliferation, migration, invasion and autophagy by targeting DEDD.","date":"2016","source":"Oncology reports","url":"https://pubmed.ncbi.nlm.nih.gov/28000900","citation_count":71,"is_preprint":false},{"pmid":"12527898","id":"PMC_12527898","title":"DEDD and DEDD2 associate with caspase-8/10 and signal cell death.","date":"2003","source":"Oncogene","url":"https://pubmed.ncbi.nlm.nih.gov/12527898","citation_count":62,"is_preprint":false},{"pmid":"22874565","id":"PMC_22874565","title":"DEDD, a novel tumor repressor, reverses epithelial-mesenchymal transition by activating selective autophagy.","date":"2012","source":"Autophagy","url":"https://pubmed.ncbi.nlm.nih.gov/22874565","citation_count":52,"is_preprint":false},{"pmid":"11753564","id":"PMC_11753564","title":"Nuclear localization of DEDD leads to caspase-6 activation through its death effector domain and inhibition of RNA polymerase I dependent transcription.","date":"2001","source":"Cell death and differentiation","url":"https://pubmed.ncbi.nlm.nih.gov/11753564","citation_count":51,"is_preprint":false},{"pmid":"21135503","id":"PMC_21135503","title":"Death effector domain-containing protein (DEDD) is required for uterine decidualization during early pregnancy in mice.","date":"2010","source":"The Journal of clinical 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bacteriology","url":"https://pubmed.ncbi.nlm.nih.gov/30692172","citation_count":20,"is_preprint":false},{"pmid":"28089609","id":"PMC_28089609","title":"De-immunized and Functional Therapeutic (DeFT) versions of a long lasting recombinant alpha interferon for antiviral therapy.","date":"2017","source":"Clinical immunology (Orlando, Fla.)","url":"https://pubmed.ncbi.nlm.nih.gov/28089609","citation_count":18,"is_preprint":false},{"pmid":"16235027","id":"PMC_16235027","title":"Fusing DEDD with ubiquitin changes its intracellular localization and apoptotic potential.","date":"2005","source":"Apoptosis : an international journal on programmed cell death","url":"https://pubmed.ncbi.nlm.nih.gov/16235027","citation_count":16,"is_preprint":false},{"pmid":"30655776","id":"PMC_30655776","title":"MicroRNA-24-3p regulates Hodgkin's lymphoma cell proliferation, migration and invasion by targeting DEDD.","date":"2018","source":"Oncology letters","url":"https://pubmed.ncbi.nlm.nih.gov/30655776","citation_count":14,"is_preprint":false},{"pmid":"15866929","id":"PMC_15866929","title":"Piv site-specific invertase requires a DEDD motif analogous to the catalytic center of the RuvC Holliday junction resolvases.","date":"2005","source":"Journal of bacteriology","url":"https://pubmed.ncbi.nlm.nih.gov/15866929","citation_count":14,"is_preprint":false},{"pmid":"9832420","id":"PMC_9832420","title":"DEFT, a novel death effector domain-containing molecule predominantly expressed in testicular germ cells.","date":"1998","source":"Endocrinology","url":"https://pubmed.ncbi.nlm.nih.gov/9832420","citation_count":12,"is_preprint":false},{"pmid":"38067377","id":"PMC_38067377","title":"POLD1 DEDD Motif Mutation Confers Hypermutation in Endometrial Cancer and Durable Response to Pembrolizumab.","date":"2023","source":"Cancers","url":"https://pubmed.ncbi.nlm.nih.gov/38067377","citation_count":10,"is_preprint":false},{"pmid":"19106089","id":"PMC_19106089","title":"The death effector domain-containing DEDD supports S6K1 activity via preventing Cdk1-dependent inhibitory phosphorylation.","date":"2008","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/19106089","citation_count":10,"is_preprint":false},{"pmid":"40032841","id":"PMC_40032841","title":"Zipper-interacting protein kinase mediates neuronal cell death and cognitive dysfunction in traumatic brain injury via regulating DEDD.","date":"2025","source":"Cell death & disease","url":"https://pubmed.ncbi.nlm.nih.gov/40032841","citation_count":9,"is_preprint":false},{"pmid":"20043882","id":"PMC_20043882","title":"The death effector domain-containing DEDD forms a complex with Akt and Hsp90, and supports their stability.","date":"2009","source":"Biochemical and biophysical research 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amplification refractory mutation sequencing system (ARMSS) for discriminating Pilos antler based on a short cytochrome b (Cytb) gene.","date":"2014","source":"Mitochondrial DNA. Part A, DNA mapping, sequencing, and analysis","url":"https://pubmed.ncbi.nlm.nih.gov/25090397","citation_count":4,"is_preprint":false},{"pmid":"35082142","id":"PMC_35082142","title":"Contribution of domain structure to the function of the yeast DEDD family exoribonuclease and RNase T functional homolog, Rex1.","date":"2022","source":"RNA (New York, N.Y.)","url":"https://pubmed.ncbi.nlm.nih.gov/35082142","citation_count":4,"is_preprint":false},{"pmid":"32113682","id":"PMC_32113682","title":"Low DEDD expression in breast cancer cells indicates higher sensitivity to the Bcl-2-specific inhibitor ABT-199.","date":"2020","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/32113682","citation_count":2,"is_preprint":false},{"pmid":"17193921","id":"PMC_17193921","title":"Identification and characterization of DEDDL, a human-specific isoform of DEDD.","date":"2006","source":"Gene expression","url":"https://pubmed.ncbi.nlm.nih.gov/17193921","citation_count":1,"is_preprint":false},{"pmid":"8870195","id":"PMC_8870195","title":"Rapid identification of Escherichia coli O157:H7 in bovine feces using the antibody-direct epifluorescent filter technique (Ab-DEFT).","date":"1996","source":"Veterinary microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/8870195","citation_count":1,"is_preprint":false},{"pmid":"27477251","id":"PMC_27477251","title":"A requirement for cell elongation protein RodZ and cell division proteins FtsN and DedD to maintain the small rod morphology of Escherichia coli at growth temperatures near 8°C.","date":"2016","source":"The Journal of general and applied microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/27477251","citation_count":1,"is_preprint":false},{"pmid":"41952488","id":"PMC_41952488","title":"[Retracted] miR‑24‑3p regulates bladder cancer cell proliferation, migration, invasion and autophagy by targeting DEDD.","date":"2026","source":"Oncology reports","url":"https://pubmed.ncbi.nlm.nih.gov/41952488","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2025.04.17.649288","title":"Polar localization of putative phospholipid transporters in  <i>Escherichia coli</i>","date":"2025-04-17","source":"bioRxiv","url":"https://doi.org/10.1101/2025.04.17.649288","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":18660,"output_tokens":4855,"usd":0.064403},"stage2":{"model":"claude-opus-4-6","input_tokens":8312,"output_tokens":3513,"usd":0.194077},"total_usd":0.25848,"stage1_batch_id":"msgbatch_0118RScg3WGaGkaZRtWZbtce","stage2_batch_id":"msgbatch_01Cpfzvtbj42aqp5oYZ5Te2s","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1998,\n      \"finding\": \"DEDD contains an N-terminal death effector domain (DED) through which it interacts with FADD and caspase-8; endogenous DEDD resides in the cytoplasm and translocates to the nucleus/nucleolus upon CD95 stimulation, where it co-localizes with UBF; recombinant DEDD binds DNA and reconstituted mononucleosomes and inhibits RNA polymerase I transcription in a reconstituted in vitro system; overexpression induces apoptosis primarily through its DED.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence/co-localization with UBF, in vitro transcription reconstitution assay, DNA/nucleosome binding assay, overexpression apoptosis assay\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal methods including in vitro reconstitution, binding assays, and cell biology in a single foundational study\",\n      \"pmids\": [\"9774341\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Nuclear/nucleolar localization of DEDD is required for its apoptotic activity; DEDD activates caspase-6 through its DED domain; DEDD specifically inhibits RNA polymerase I-dependent transcription in vivo (blocking BrUTP incorporation); the DED alone is sufficient for DNA binding, caspase-6 activation, and Pol I transcriptional repression; mutation of all three nuclear localization signals (NLS) abolishes nuclear targeting and apoptosis induction.\",\n      \"method\": \"BrUTP incorporation assay (in vivo Pol I transcription), immunofluorescence with anti-DEDD antibody, NLS mutagenesis, caspase-6 activity assay, cytoplasmic DEDD (DEDD-ΔNLS1-3) functional analysis\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal methods (in vivo transcription assay, mutagenesis, localization) in a single study with functional validation\",\n      \"pmids\": [\"11753564\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Diubiquitinated DEDD interacts with the K8/18 intermediate filament network and pro-caspase-3; early in apoptosis, DEDD and DEDD2 form filaments co-localizing with K8/18 in a caspase-3-dependent manner; these structures collapse into inclusions containing active caspase-3 and cleaved K18; cytosolic DEDD (DEDD-ΔNLS1-3) inhibits caspase-3 activation and K18 cleavage; siRNA-mediated DEDD knockdown inhibits staurosporine-induced DNA degradation; DEDD functions as a scaffold directing effector caspase-3 to specific substrates.\",\n      \"method\": \"Co-immunoprecipitation (DEDD with K18 and pro-caspase-3), immunofluorescence, siRNA knockdown, biochemical kinetics of caspase-3 activation and K18 cleavage\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal co-IP plus functional KD/KO with defined cellular phenotype and kinetic analysis\",\n      \"pmids\": [\"12235123\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"DEDD interacts with the TFIIIC102 subunit of human transcription factor TFIIIC via its DED domain; co-expression of DEDD with hTFIIIC102 causes translocation of hTFIIIC102 to the nucleus; overexpression of DEDD inhibits NF-κB promoter-driven luciferase expression.\",\n      \"method\": \"Yeast two-hybrid identification of TFIIIC102 as DEDD interactor, co-immunoprecipitation, co-localization immunofluorescence, luciferase reporter assay\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — yeast two-hybrid plus co-IP and reporter assay, single lab\",\n      \"pmids\": [\"11965497\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"DEDD and DEDD2 bind to caspase-8 and caspase-10 (tandem DED-containing caspases) and to each other and to each other's homologue; nuclear localization is required for DEDD/DEDD2-induced apoptosis; both the N-terminal DED and C-terminal region of DEDD2 can independently induce apoptosis.\",\n      \"method\": \"Co-immunoprecipitation/binding assays, deletion analysis, overexpression apoptosis assay in various cell types\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — co-IP binding plus deletion analysis, single lab with multiple cell types\",\n      \"pmids\": [\"12527898\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"DEDD exists in non-, mono-, and diubiquitinated forms; monoubiquitination relocates DEDD from the nucleolus to the cytosol; a central region (aa 109–305) outside the DED is required for ubiquitination; cIAP-1 and cIAP-2 can catalyze both mono- and polyubiquitination of DEDD; fusion of ubiquitin to DEDD C-terminus (mimicking monoubiquitinated DEDD) increases its pro-apoptotic potential.\",\n      \"method\": \"Ubiquitin-DEDD fusion construct, mutagenesis of lysine residues, co-transfection with cIAP-1/2, immunofluorescence localization, apoptosis assay\",\n      \"journal\": \"Apoptosis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — mutagenesis and functional ubiquitin fusion experiments, single lab\",\n      \"pmids\": [\"16235027\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"DEDD associates with the mitotic Cdk1/cyclin B1 complex via direct binding to cyclin B1 and inhibits its kinase activity; DEDD-null embryonic fibroblasts show increased nuclear Cdk1/cyclin B1 kinase activity, accelerated mitotic progression, and shortened G2/M; DEDD-/- mice display decreased body and organ weights; absence of DEDD reduces rRNA amounts and cell volume due to rapid termination of rRNA synthesis before division.\",\n      \"method\": \"Co-immunoprecipitation (DEDD with Cdk1/cyclin B1), kinase activity assay in DEDD-/- vs. DEDD+/+ cells, DEDD-/- mouse model, cell cycle analysis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — kinase assay plus genetic KO model with multiple phenotypic readouts and co-IP binding confirmation\",\n      \"pmids\": [\"17283331\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"DEDD associates with S6K1 and supports S6K1 activity by preventing Cdk1-dependent inhibitory phosphorylation at the S6K1 C-terminus; DEDD-/- cells show reduced S6K1 activating phosphorylation (Thr-389) and increased inhibitory Cdk1-dependent phosphorylation; DEDD-/- mice show reduced pancreatic islet insulin mass and glucose intolerance, paralleling S6K1-/- phenotype.\",\n      \"method\": \"Co-immunoprecipitation (DEDD with S6K1), phosphorylation analysis in DEDD-/- cells/tissues, DEDD-/- mouse metabolic phenotyping, comparison with S6K1-/- mice\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — co-IP plus phosphorylation biochemistry in KO cells and in vivo mouse model with clear phenotype\",\n      \"pmids\": [\"19106089\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"DEDD forms a complex with Akt and Hsp90 and supports the stability of both proteins; in DEDD-/- mice, Akt protein levels are diminished in skeletal muscle and adipose tissue, impairing GLUT4 translocation upon insulin stimulation; Cdk1 inhibition in DEDD-/- cells (via siRNA or inhibitor) restores Akt and Hsp90 levels, suggesting DEDD stabilizes Akt by suppressing Cdk1.\",\n      \"method\": \"Co-immunoprecipitation (DEDD with Akt and Hsp90), DEDD-/- mouse tissue analysis, Cdk1 siRNA knockdown, GLUT4 translocation assay\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — co-IP plus in vivo KO phenotype and mechanistic rescue, single lab\",\n      \"pmids\": [\"20043882\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Female DEDD-/- mice are infertile due to defective uterine decidualization; DEDD-deficient decidual cells show attenuated polyploidization; DEDD associates with and stabilizes cyclin D3 (important for polyploidization); overexpression of cyclin D3 rescues polyploidization in DEDD-deficient cells; decreased Akt levels in DEDD-/- uteri contribute to defective decidualization, and Akt overexpression restores polyploidization.\",\n      \"method\": \"DEDD-/- mouse model (fertility and decidualization phenotype), co-immunoprecipitation (DEDD with cyclin D3), rescue by cyclin D3 or Akt overexpression, cell polyploidization assay\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo KO phenotype with molecular rescue experiments and co-IP binding evidence, multiple orthogonal approaches\",\n      \"pmids\": [\"21135503\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"DEDD physically interacts with Smad3 and inhibits TGF-β1/Smad3-mediated transcription by preventing Smad3 phosphorylation and nuclear translocation, reducing formation of the Smad3-Smad4 complex; DEDD inhibits TGF-β1-mediated cell invasion.\",\n      \"method\": \"Co-immunoprecipitation (DEDD with Smad3), immunofluorescence (Smad3 localization), reporter assay for Smad3 transcriptional activity, invasion assay\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — co-IP with functional reporter and invasion assay, single lab\",\n      \"pmids\": [\"20553715\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"DEDD directly interacts with the PI3KC3 (PIK3C3)/Beclin1 complex and activates autophagy; the DEDD-PI3KC3 interaction stabilizes PI3KC3; this autophagy activation leads to lysosomal degradation of Snail and Twist (EMT master regulators), thereby attenuating epithelial-to-mesenchymal transition; DEDD overexpression suppresses invasion in vitro and metastasis in vivo while DEDD silencing promotes invasion.\",\n      \"method\": \"Co-immunoprecipitation (DEDD with PI3KC3/Beclin1), in vitro and in vivo invasion/metastasis assays, autophagy induction assay, Western blot for Snail/Twist degradation, siRNA knockdown\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — co-IP plus both in vitro and in vivo functional assays with molecular mechanism defined, replicated in same study by multiple methods\",\n      \"pmids\": [\"22719072\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"The N-terminal DED domain of DEDD is sufficient to inhibit TGF-β1-induced Smad3 nuclear translocation and Smad3-Smad4 complex formation; both full-length DEDD and its N-terminal (N-DEDD) and C-terminal (C-DEDD) truncation mutants can induce apoptosis and inhibit cell proliferation.\",\n      \"method\": \"Truncation mutant analysis, immunofluorescence, co-immunoprecipitation, flow cytometry (apoptosis), MTT assay (proliferation)\",\n      \"journal\": \"Yao xue xue bao = Acta pharmaceutica Sinica\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — domain mapping with functional readouts, single lab\",\n      \"pmids\": [\"23888690\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"DEDD interacts with and stabilizes Bcl-2 protein; DEDD knockdown downregulates Bcl-2 transcriptional activity and accelerates Bcl-2 degradation; DEDD expression levels are positively correlated with Bcl-2 in breast cancer cells; knockdown of DEDD causes drug resistance to doxorubicin and paclitaxel, while overexpression increases sensitivity.\",\n      \"method\": \"Co-immunoprecipitation (DEDD with Bcl-2), Western blot, luciferase-based transcription assay, drug sensitivity assay (MTT), siRNA knockdown and overexpression\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — co-IP with multiple functional readouts, single lab\",\n      \"pmids\": [\"32113682\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"ZIPK (zipper-interacting protein kinase) binds to and phosphorylates DEDD at the S9 residue, enhancing DEDD stability and leading to activation of caspase-3-mediated apoptosis in neurons; ZIPK haploinsufficiency reduces neuronal apoptosis, DEDD upregulation, and caspase-3 activation after traumatic brain injury; pharmacological ZIPK inhibition prior to TBI prevents DEDD upregulation and caspase-3 activation.\",\n      \"method\": \"Co-immunoprecipitation (ZIPK with DEDD), phosphorylation mapping (S9 site), ZIPK haploinsufficiency mouse model, in vitro kinase assay, caspase-3 activity assay, pharmacological ZIPK inhibitor\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — kinase assay with phosphosite mapping plus in vivo KO model, single lab\",\n      \"pmids\": [\"40032841\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"DEDD co-purifies with CK18 in subcellular fractionation (Triton X-100 resistant fraction); mono- or diubiquitinated DEDD associates with K8/18 cytokeratin filaments; cells with filamentous DEDD distribution are more apoptosis-prone; DEDD is proposed to provide a scaffold for proximity-induced autocleavage and activation of procaspase-9 and -3 at the CK8/18 scaffold.\",\n      \"method\": \"Double immunofluorescence, Triton X-100 extraction and subcellular fractionation, co-purification with CK18, apoptosis sensitivity assay (M30 staining after roscovitine)\",\n      \"journal\": \"Apoptosis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — biochemical co-purification with functional correlation, single lab\",\n      \"pmids\": [\"16820959\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"DEDDL, a longer human-specific isoform of DEDD produced by alternative splicing, is expressed in T lymphocytes and dendritic cells; DEDDL binds FADD and cFLIP more potently than DEDD in co-immunoprecipitation, and is a more potent apoptosis inducer than DEDD; both DEDD and DEDDL are substrates of active caspases.\",\n      \"method\": \"Co-immunoprecipitation (DEDDL vs. DEDD with FADD/cFLIP), overexpression apoptosis assay, RT-PCR expression analysis\",\n      \"journal\": \"Gene expression\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single co-IP comparison plus overexpression, single lab, limited functional follow-up\",\n      \"pmids\": [\"17193921\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"DEDD is a ubiquitous, highly conserved death effector domain (DED)-containing protein that shuttles between the cytoplasm and nucleolus (regulated by monoubiquitination via cIAP-1/2) to coordinate apoptosis—acting as a scaffold that recruits pro-caspase-3 to the K8/18 intermediate filament network, interacting with FADD and caspase-8/10 via its DED, activating caspase-6 and inhibiting RNA Pol I transcription in the nucleolus, and suppressing epithelial-mesenchymal transition by binding PI3KC3/Beclin1 to activate autophagy-mediated degradation of Snail and Twist—while also regulating cell cycle and growth by directly inhibiting mitotic Cdk1/cyclin B1 kinase activity (via cyclin B1 binding), supporting S6K1 and Akt stability, and stabilizing cyclin D3 and Bcl-2; DEDD stability is itself controlled by ZIPK-mediated phosphorylation at S9.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"DEDD is a death effector domain (DED)-containing scaffold protein that integrates apoptotic signaling, cell cycle control, and autophagy-mediated suppression of epithelial-mesenchymal transition. In apoptosis, DEDD interacts with FADD and caspase-8/10 via its DED, recruits pro-caspase-3 to keratin 8/18 intermediate filaments for proximity-induced activation, activates caspase-6, and inhibits RNA polymerase I transcription upon nucleolar translocation—a process regulated by cIAP-1/2-mediated monoubiquitination that shuttles DEDD between the nucleolus and cytoplasm [PMID:9774341, PMID:11753564, PMID:12235123, PMID:16235027]. Beyond apoptosis, DEDD directly binds and inhibits mitotic Cdk1/cyclin B1 kinase activity, thereby supporting S6K1 and Akt stability and controlling cell size and organ growth, as demonstrated by decreased body weight, glucose intolerance, and female infertility in DEDD-knockout mice [PMID:17283331, PMID:19106089, PMID:21135503]. DEDD also activates autophagy by binding the PI3KC3/Beclin1 complex, promoting lysosomal degradation of Snail and Twist to suppress invasion and metastasis, and its own stability is regulated by ZIPK-mediated phosphorylation at S9 [PMID:22719072, PMID:40032841].\",\n  \"teleology\": [\n    {\n      \"year\": 1998,\n      \"claim\": \"Identification of DEDD as a DED-containing protein that interacts with FADD and caspase-8, translocates to the nucleolus upon death receptor signaling, binds DNA/nucleosomes, and directly inhibits RNA Pol I transcription established DEDD as a nuclear apoptosis effector linking death receptor signaling to transcriptional shutdown.\",\n      \"evidence\": \"Co-IP, immunofluorescence co-localization with UBF, in vitro Pol I transcription reconstitution, and DNA/nucleosome binding assays in human cells\",\n      \"pmids\": [\"9774341\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of DEDD's nucleolar target beyond UBF co-localization not resolved\", \"Endogenous stoichiometry of DEDD–FADD complex unclear\", \"No structural data for DEDD-DED interactions\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Demonstrating that all three NLS motifs are required for nuclear translocation and that the DED alone suffices for caspase-6 activation and Pol I repression established that DEDD's apoptotic function is nuclear and that its DED is the minimal functional unit for transcriptional inhibition.\",\n      \"evidence\": \"NLS mutagenesis (DEDD-ΔNLS1-3), BrUTP incorporation (in vivo Pol I activity), caspase-6 activity assay\",\n      \"pmids\": [\"11753564\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct Pol I subunit target not identified\", \"How caspase-6 activation by DEDD DED is mechanistically achieved remains unresolved\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Discovery that diubiquitinated DEDD scaffolds pro-caspase-3 to K8/18 intermediate filaments, directing effector caspase activation to specific substrates, revealed a non-nuclear cytoplasmic apoptotic function for DEDD as a spatial organizer of caspase activity.\",\n      \"evidence\": \"Reciprocal co-IP of DEDD with K18 and pro-caspase-3, siRNA knockdown blocking staurosporine-induced DNA degradation, kinetic analysis of caspase-3 activation\",\n      \"pmids\": [\"12235123\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether DEDD directly contacts both K18 and caspase-3 simultaneously or sequentially is unknown\", \"Ubiquitin linkage type on DEDD not determined\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Showing that cIAP-1/2-mediated monoubiquitination relocates DEDD from nucleolus to cytosol and that a ubiquitin-DEDD fusion enhances pro-apoptotic potential established ubiquitination as the switch governing DEDD's compartment-specific functions.\",\n      \"evidence\": \"Lysine mutagenesis, cIAP-1/2 co-transfection, ubiquitin-DEDD C-terminal fusion construct, immunofluorescence localization\",\n      \"pmids\": [\"16235027\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Specific lysine residue(s) ubiquitinated not pinpointed\", \"No deubiquitinase identified\", \"In vivo relevance of cIAP-mediated ubiquitination not tested in KO model\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Demonstration that DEDD directly binds cyclin B1 and inhibits Cdk1/cyclin B1 kinase activity, with DEDD-knockout mice showing accelerated mitosis, reduced rRNA, and decreased body/organ size, revealed an unexpected cell-cycle regulatory role independent of apoptosis.\",\n      \"evidence\": \"Co-IP of DEDD with Cdk1/cyclin B1, kinase activity assay in DEDD−/− vs. wild-type MEFs, DEDD−/− mouse phenotyping including cell cycle analysis\",\n      \"pmids\": [\"17283331\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Binding interface between DEDD and cyclin B1 not mapped\", \"Whether DEDD inhibits Cdk1 catalytically or by sequestering cyclin B1 is unresolved\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Finding that DEDD associates with S6K1 and protects it from Cdk1-dependent inhibitory phosphorylation, with DEDD-knockout mice phenocopying S6K1 knockouts in glucose intolerance and reduced islet mass, connected DEDD's Cdk1 inhibition to growth/metabolic signaling via mTOR-S6K1.\",\n      \"evidence\": \"Co-IP of DEDD with S6K1, phosphorylation analysis (Thr-389 vs. Cdk1 sites) in DEDD−/− cells and tissues, metabolic phenotyping of DEDD−/− mice\",\n      \"pmids\": [\"19106089\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether DEDD–S6K1 interaction is direct or bridged by cyclin B1/Cdk1 not fully resolved\", \"Tissue-specific requirements not mapped\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Showing that DEDD complexes with Akt and Hsp90 and that Cdk1 inhibition restores Akt levels in DEDD−/− cells established that DEDD stabilizes Akt indirectly through Cdk1 suppression, explaining impaired insulin-stimulated GLUT4 translocation in knockout tissues.\",\n      \"evidence\": \"Co-IP of DEDD with Akt and Hsp90, DEDD−/− mouse skeletal muscle/adipose analysis, Cdk1 siRNA rescue of Akt levels, GLUT4 translocation assay\",\n      \"pmids\": [\"20043882\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether DEDD directly contacts Akt or only through Hsp90 not determined\", \"Contribution of Hsp90 chaperone activity versus Cdk1 suppression not separated\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Linking DEDD to cyclin D3 stabilization and Akt-dependent polyploidization during decidualization, with DEDD−/− female infertility rescued by cyclin D3 or Akt overexpression, demonstrated a physiological non-apoptotic role for DEDD in reproductive biology.\",\n      \"evidence\": \"DEDD−/− mouse fertility and decidualization analysis, co-IP of DEDD with cyclin D3, rescue by cyclin D3 or Akt overexpression, polyploidization assay\",\n      \"pmids\": [\"21135503\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which DEDD stabilizes cyclin D3 (proteasome protection vs. other) not defined\", \"Whether male DEDD−/− fertility phenotypes exist not explored\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Discovery that DEDD binds PI3KC3/Beclin1 to activate autophagy and promote lysosomal degradation of Snail and Twist, suppressing EMT and metastasis both in vitro and in vivo, established DEDD as a metastasis suppressor acting through autophagy.\",\n      \"evidence\": \"Co-IP of DEDD with PI3KC3/Beclin1, autophagy induction assay, invasion/metastasis assays in vitro and in vivo, Western blot for Snail/Twist degradation, siRNA knockdown\",\n      \"pmids\": [\"22719072\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Selectivity mechanism for Snail/Twist as autophagy cargo not identified\", \"Whether DEDD activates PI3KC3 enzymatically or by stabilization not distinguished\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Identification of DEDD as a stabilizer of Bcl-2 protein, with DEDD knockdown accelerating Bcl-2 degradation and altering drug sensitivity, added an anti-apoptotic regulatory dimension to DEDD's functions.\",\n      \"evidence\": \"Co-IP of DEDD with Bcl-2, siRNA knockdown and overexpression, drug sensitivity assays in breast cancer cells\",\n      \"pmids\": [\"32113682\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of Bcl-2 stabilization (proteasomal vs. other) not determined\", \"Paradox of a pro-apoptotic DED protein stabilizing anti-apoptotic Bcl-2 not reconciled\", \"Single cell-type study\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Demonstration that ZIPK phosphorylates DEDD at S9 to enhance its stability and promote caspase-3-dependent neuronal apoptosis after traumatic brain injury identified the first upstream kinase controlling DEDD protein levels.\",\n      \"evidence\": \"Co-IP and in vitro kinase assay (ZIPK–DEDD), S9 phosphosite mapping, ZIPK haploinsufficiency mouse model after TBI, pharmacological ZIPK inhibition\",\n      \"pmids\": [\"40032841\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether S9 phosphorylation affects DEDD ubiquitination or other post-translational modifications not tested\", \"Generality beyond neuronal TBI context unknown\", \"Single lab\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The structural basis for DEDD's multivalent scaffolding—simultaneously engaging Cdk1/cyclin B1, PI3KC3/Beclin1, caspase-3/K18, and Akt/Hsp90—and how cells select between DEDD's apoptotic versus growth-regulatory versus autophagy functions in a context-dependent manner remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No crystal or cryo-EM structure of DEDD or any DEDD complex\", \"No systematic interactome under apoptotic vs. proliferative conditions\", \"Regulatory logic integrating ubiquitination, phosphorylation, and localization not modeled\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [2, 15]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [6, 7, 10]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005730\", \"supporting_discovery_ids\": [0, 1, 5]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [2, 5, 15]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [2, 15]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [0, 1, 2, 14]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [6, 7]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [11]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [7, 8, 10]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"complexes\": [\n      \"Cdk1/cyclin B1\",\n      \"PI3KC3/Beclin1\"\n    ],\n    \"partners\": [\n      \"FADD\",\n      \"CASP8\",\n      \"CASP3\",\n      \"KRT18\",\n      \"CDK1\",\n      \"CCNB1\",\n      \"RPS6KB1\",\n      \"AKT1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}