{"gene":"ZBP1","run_date":"2026-06-11T09:02:06","timeline":{"discoveries":[{"year":2007,"finding":"ZBP1/DAI (DLM-1) binds double-stranded DNA directly and, upon binding, enhances its association with IRF3 transcription factor and TBK1 serine/threonine kinase to activate type I interferon gene expression. siRNA knockdown of ZBP1 inhibited DNA-mediated innate immune gene induction, establishing ZBP1 as a cytosolic DNA sensor upstream of the IRF3-TBK1 axis.","method":"siRNA knockdown, co-immunoprecipitation, overexpression in mouse fibroblasts, reporter assays","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal binding shown by Co-IP, functional knockdown and overexpression experiments, replicated across multiple DNA sources; foundational paper independently confirmed","pmids":["17618271"],"is_preprint":false},{"year":2001,"finding":"Crystal structure of the DLM-1 (ZBP1) Zα domain bound to left-handed Z-DNA at 1.85 Å resolution revealed a winged-helix fold and a conserved Z-DNA recognition core shared with ADAR1 Zα, defining a family of Z-DNA-binding proteins with a common structure-specific recognition mechanism.","method":"X-ray crystallography","journal":"Nature structural biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — high-resolution crystal structure with direct structural validation; foundational structural paper","pmids":["11524677"],"is_preprint":false},{"year":2008,"finding":"ZBP1/DAI requires three DNA-binding domains (Zα1, Zα2, and D3) for full activation of type I IFN in vivo; artificially induced dimerization of DAI causes DNA-independent activation of type I IFN genes, indicating dimerization is a key step in DAI activation.","method":"Mutational analysis of DNA-binding domains, forced dimerization constructs, reporter assays, in vitro DNA binding","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — domain mutagenesis plus functional in vitro and in vivo assays, multiple orthogonal approaches in one study","pmids":["18375758"],"is_preprint":false},{"year":2009,"finding":"ZBP1/DAI contains two RIP homotypic interaction motifs (RHIMs) that recruit RHIM-containing kinases RIPK1 and RIPK3 to relay NF-κB activation signals downstream of cytosolic DNA sensing. RIPK3 knockdown, like RIPK1 knockdown, reduces DAI-induced NF-κB activation. The MCMV protein M45 inhibits RIP recruitment to DAI via its own RHIM domain.","method":"Co-immunoprecipitation, siRNA knockdown of RIPK1/RIPK3, NF-κB reporter assays, RHIM domain identification by sequence analysis","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP, functional knockdown with defined pathway readout, multiple orthogonal methods","pmids":["19590578"],"is_preprint":false},{"year":2012,"finding":"ZBP1/DAI forms a complex with RIPK3 via RHIM-dependent interactions to mediate virus-induced programmed necrosis during MCMV infection. DAI-deficient cells and mice are resistant to MCMV-induced necrosis, and the MCMV vIRA protein suppresses this pathway by targeting the DAI-RIP3 complex.","method":"Co-immunoprecipitation, DAI knockdown/knockout cells, Zbp1−/− mouse genetics, viral pathogenesis assays","journal":"Cell host & microbe","confidence":"High","confidence_rationale":"Tier 2 / Strong — complex formation by Co-IP, reciprocal genetic rescue with Zbp1−/− mice, viral evasion mechanism confirmed; independently replicated","pmids":["22423968"],"is_preprint":false},{"year":2016,"finding":"ZBP1 senses influenza A virus genomic RNA (vRNPs) and associates with RIPK3, recruiting MLKL and RIPK1 to RIPK3 to trigger both necroptosis and apoptosis. DAI-deficient cells and mice fail to activate RIPK3 in response to IAV, establishing DAI as the link between IAV RNA and RIPK3 activation.","method":"DAI knockout/knockdown cells, RIPK3 co-immunoprecipitation, cell death assays, Zbp1−/− mouse infection model","journal":"Cell host & microbe","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO with defined molecular phenotype, Co-IP of complex, in vivo mouse model; independently replicated","pmids":["27746097"],"is_preprint":false},{"year":2016,"finding":"RIPK1's RHIM domain prevents ZBP1 from binding and activating RIPK3; mutation of RIPK1 RHIM (IQIG→AAAA) allows ZBP1 to interact with phosphorylated RIPK3, causing ZBP1-RIPK3-MLKL-dependent necroptosis and perinatal lethality. ZBP1 deficiency prevents necroptosis and skin inflammation in RIPK1-RHIM-mutant and epidermis-specific RIPK1-KO mice.","method":"RHIM knock-in mouse genetics, Co-immunoprecipitation, Zbp1−/− mouse genetics, histopathology","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple genetic mouse models with clear mechanistic readout, Co-IP confirming ZBP1-RIPK3 interaction; replicated in two simultaneous Nature papers","pmids":["27819681","27819682"],"is_preprint":false},{"year":2016,"finding":"The RIPK1 RHIM acts as a brake preventing ZBP1 from engaging RIPK3's RHIM; in RIPK1-RHIM mutant (IQIG→AAAA) mice, ZBP1 constitutively interacts with RIPK3 (but not in WT or RIPK3-RHIM mutant cells), driving RIPK3 autophosphorylation (Thr231/Ser232) and MLKL-dependent perinatal lethality.","method":"Knock-in mouse genetics (Ripk1RHIM/RHIM), Co-immunoprecipitation of ZBP1-RIPK3, Zbp1−/− genetic rescue, Western blot for pRIPK3","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple genetic models, direct Co-IP of ZBP1-RIPK3 interaction mapped to RHIM, multiple orthogonal rescue experiments","pmids":["27819682"],"is_preprint":false},{"year":2017,"finding":"ZBP1 directly binds RNA via its Zα domains; mutation of key amino acids in Zα1 and Zα2 required for Z-nucleic acid binding abolished ZBP1-mediated necroptosis during MCMV infection and upon ZBP1 overexpression. Cell death required RNA synthesis but not viral DNA replication, implicating Z-RNA as the ZBP1 ligand.","method":"Reconstitution/knock-in models with ZBP1 Zα domain mutations, MCMV infection cell death assays, RNA cross-linking, viral replication inhibitor experiments","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — mutagenesis of active-site residues plus reconstitution/knock-in models with direct functional readout; ZBP1 cross-linked to endogenous RNA","pmids":["28716805"],"is_preprint":false},{"year":2017,"finding":"ZBP1 activation during IAV infection requires upstream RIG-I-MAVS-IFN-β signaling; ZBP1 undergoes ubiquitination after IAV infection as a post-translational modification. ZBP1 senses IAV vRNP complexes (not free RNA) to trigger programmed cell death.","method":"RIG-I/MAVS KO cells, IFN-β signaling inhibition, ubiquitination assays, vRNP pulldown, cell death assays","journal":"The Journal of experimental medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple genetic knockouts with defined functional readout, ubiquitination shown biochemically; single lab","pmids":["28634194"],"is_preprint":false},{"year":2017,"finding":"The N-terminal domain of ZBP1 mediates ZBP1-ZBP1 homointeraction, and the RHIM domain in the C-terminal region interacts with RIPK3 to initiate RIPK3-dependent necroptosis downstream of IFN stimulation.","method":"Domain deletion constructs, co-immunoprecipitation of ZBP1 self-interaction and ZBP1-RIPK3, IFN-induced necroptosis assays in RIPK1/FADD/caspase-8 KO cells","journal":"Cellular & molecular immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP domain mapping, functional cell death assays; single lab, two orthogonal approaches","pmids":["31076724"],"is_preprint":false},{"year":2017,"finding":"MCMV requires viral IE3-dependent early transcription (not input virion DNA or newly synthesized viral DNA) for DAI/ZBP1-mediated necroptosis; the Zα2 domain of DAI/ZBP1 is required for sensing MCMV and triggering necroptosis, implicating viral RNA transcripts as the relevant ligand.","method":"Viral mutants blocking DNA replication/IE3 transcription, Zα2 domain mutation of ZBP1, necroptosis assays","journal":"EMBO reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple viral mutants combined with ZBP1 domain mutagenesis; single lab","pmids":["28607035"],"is_preprint":false},{"year":2019,"finding":"ZBP1 and RIPK3 activation in ZIKV-infected neurons does not induce necroptosis but instead restricts viral replication by upregulating the enzyme IRG1, leading to itaconate production that inhibits succinate dehydrogenase and suppresses viral genome replication via an immunometabolic mechanism.","method":"ZBP1/RIPK3 KO murine neurons, ZIKV infection model, metabolomics, IRG1 KO, itaconate supplementation","journal":"Immunity","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple genetic KOs with defined metabolic and viral phenotype, metabolomics, multiple orthogonal approaches in one study","pmids":["30635240"],"is_preprint":false},{"year":2019,"finding":"ZBP1/DAI drives RIPK3-mediated cell death (necroptosis and apoptosis) in response to IFNs in the absence of RIPK1; IFN-activated JAK/STAT signaling induces ZBP1 expression, which then complexes with RIPK3 to trigger caspase-8-mediated apoptosis and MLKL-driven necroptosis.","method":"Zbp1−/− genetics in Ripk1−/− background, JAK/STAT inhibitors, ZBP1-RIPK3 co-immunoprecipitation, Ripk1−/− mouse survival studies","journal":"Journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO in dual-KO background, Co-IP of complex, in vivo survival data; single lab","pmids":["31358656"],"is_preprint":false},{"year":2020,"finding":"Replicating influenza A virus generates Z-RNAs that activate ZBP1 in the nucleus of infected cells; nuclear ZBP1 then initiates RIPK3-mediated MLKL activation in the nucleus, causing nuclear envelope disruption, DNA leakage into cytosol, and 'inside-out' necroptosis. Nuclear MLKL activation potently activates neutrophils.","method":"Z-RNA detection in IAV-infected cells, RIPK3/MLKL nuclear localization by imaging, MLKL-deficient mice, neutrophil recruitment assays, survival studies","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — direct Z-RNA detection, live-cell and fixed imaging of nuclear signaling complex, genetic KO mouse model, multiple orthogonal methods; high-impact independently replicated study","pmids":["32200799"],"is_preprint":false},{"year":2020,"finding":"Zα-domain-dependent sensing of endogenous Z-form nucleic acids (Z-DNA/Z-RNA) by ZBP1 triggers RIPK3-dependent necroptosis and inflammation in the absence of viral infection. ZBP1 constitutively binds cellular double-stranded RNA in a Zα-dependent manner; inhibition of nuclear export triggers Zα-dependent RIPK3 activation in the nucleus. Endogenous retroelement-derived dsRNA is implicated as a Zα-domain ligand.","method":"Ripk1mR/mR and RIPK1E-KO and FADDIEC-KO mouse models with Zbp1−/− genetic rescue, nuclear export inhibition, Zα domain mutagenesis, ZBP1 RNA cross-linking","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple independent genetic mouse models all rescued by ZBP1 or Zα domain ablation, RNA cross-linking, nuclear export experiments; multiple orthogonal approaches","pmids":["32296175"],"is_preprint":false},{"year":2021,"finding":"ADAR1 interacts with the Zα2 domain of ZBP1 to suppress ZBP1-RIPK3 interactions and thereby limit ZBP1-mediated PANoptosis. Deletion of ADAR1 (Adar1fl/fl LysMcre) increases ZBP1-dependent cell death; deletion of the ZBP1 Zα2 domain restores tumorigenesis in ADAR1-deficient mice, demonstrating ADAR1 acts as a negative regulator of ZBP1 via Zα2-domain interaction.","method":"Co-immunoprecipitation of ADAR1-ZBP1, Zα2 domain deletion knock-in mice, conditional ADAR1 KO, tumor models, PANoptosis assays","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP of ADAR1-ZBP1 interaction, domain-specific deletion, in vivo genetic rescue experiments, multiple orthogonal approaches","pmids":["34686350"],"is_preprint":false},{"year":2021,"finding":"AIM2 regulates ZBP1 as part of a large multi-protein PANoptosome complex including AIM2, pyrin, ZBP1, ASC, caspase-1, caspase-8, RIPK3, RIPK1, and FADD; this complex drives inflammatory cell death (PANoptosis). AIM2 is required for ZBP1 integration into the complex during HSV-1 and F. novicida infection.","method":"Co-immunoprecipitation of multi-protein complex, AIM2/ZBP1/pyrin KO genetics, infectious disease mouse models, cell death assays","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP of endogenous multi-protein complex, multiple genetic KOs, infectious disease models; published in high-impact journal with multiple orthogonal methods","pmids":["34471287"],"is_preprint":false},{"year":2022,"finding":"ADAR1 prevents accumulation of endogenous Z-RNAs (from Alu inverted repeat dsRNAs); loss of ADAR1's Zα domain causes ZBP1 activation leading to caspase-8-dependent apoptosis and MLKL-mediated necroptosis. ZBP1 ablation fully rescues overt pathology caused by ADAR1 Zα-domain mutation, positioning ADAR1 as a negative regulator of sterile ZBP1 activation.","method":"Adar−/− and Adar1mZα/− mouse genetics combined with Zbp1−/− rescue, cell death assays, RNA-seq for Alu elements","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic rescue experiments in multiple mouse models, multiple cell death readouts, RNA analysis; three simultaneous Nature papers independently confirm ADAR1-ZBP1 axis","pmids":["35859175","35859177","35859176"],"is_preprint":false},{"year":2022,"finding":"ADAR1 depletion or mutation results in Z-RNA accumulation and ZBP1 activation culminating in RIPK3-mediated necroptosis. The small molecule CBL0137 activates ZBP1 by triggering Z-DNA formation in cells, inducing ZBP1-dependent necroptosis in cancer-associated fibroblasts.","method":"ADAR1 KO/mutation in cancer cell lines, Z-RNA detection, ZBP1 KO controls, small molecule (CBL0137) treatment, tumor models","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO controls, small molecule activation with ZBP1 KO specificity control, Z-RNA detection; multiple orthogonal methods","pmids":["35614224"],"is_preprint":false},{"year":2021,"finding":"Vaccinia virus protein E3 prevents ZBP1-mediated necroptosis by competing for Z-form RNA through its N-terminal Zα domain; in the absence of the E3 Zα domain, Z-form RNA accumulates during early VACV infection, triggering ZBP1 to recruit RIPK3 and execute RIPK3-MLKL-dependent necroptosis. Substitution of Zα domains from ZBP1 or ADAR1 into E3 restores necroptosis suppression.","method":"E3 Zα mutant VACV, Z-RNA detection, ZBP1/RIPK3/MLKL KO cell lines, domain swap experiments","journal":"Cell host & microbe","confidence":"High","confidence_rationale":"Tier 2 / Moderate — domain swap mutagenesis, multiple genetic KO controls, Z-RNA detection, mechanistic viral evasion study","pmids":["34192517"],"is_preprint":false},{"year":2021,"finding":"ZBP1 constitutive binding to RIPK1 is essential for TRIFosome (FADD-RIPK1-caspase-8 complex) formation, caspase-8-mediated cell death, and inflammasome activation in response to LPS and Yersinia pseudotuberculosis, positioning ZBP1 as an effector of the TRIF-dependent cell death pathway.","method":"ZBP1 KO cells/mice, co-immunoprecipitation of ZBP1-RIPK1, LPS and Yersinia infection models, caspase-8 and inflammasome activity assays","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP of ZBP1-RIPK1, ZBP1 KO with functional readout, in vivo model; single lab","pmids":["33397971"],"is_preprint":false},{"year":2022,"finding":"ZBP1 promotes TLR3/TLR4-mediated inflammatory responses by facilitating timely delivery of RIPK1 to TRIF and enabling M1-ubiquitination of RIPK1, sustaining downstream inflammatory signaling cascades; Zbp1−/− mice show resistance to LPS-induced septic shock.","method":"Zbp1−/− mouse LPS sepsis model, co-immunoprecipitation of ZBP1-RIPK1-TRIF complex, RIPK1 ubiquitination assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP of ternary complex, ubiquitination biochemistry, in vivo KO mouse model; single lab","pmids":["35666872"],"is_preprint":false},{"year":2022,"finding":"In human cells, ZBP1 associates with RIPK1, RIPK3, and ubiquitin ligases cIAP1 and LUBAC; ZBP1 promotes K63- and M1-linked ubiquitination of RIPK1 and ZBP1 itself via RIPK1 and RIPK3 as scaffolds (independently of their kinase activity) to activate TAK1- and IKK-mediated inflammatory signaling and cytokine production.","method":"Co-immunoprecipitation of ZBP1-RIPK1-RIPK3-cIAP1-LUBAC, ubiquitin chain-specific pulldowns, kinase-dead RIPK1/RIPK3 mutants, cytokine production assays in HT29 cells","journal":"EMBO reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP of multi-protein complex, ubiquitination biochemistry, kinase-dead mutants; single lab, human cell system","pmids":["36268590"],"is_preprint":false},{"year":2022,"finding":"Caspase-8 and FADD suppress spontaneous ZBP1 expression and thereby prevent spontaneous RIPK3-MLKL activation and necroptosis; in Caspase-8-deficient cells, increased ZBP1 expression is maintained by a positive feedback loop requiring cGAS-STING-TBK1 signaling. ZBP1 deletion suppresses spontaneous MLKL phosphorylation in Casp8−/− mice in vivo.","method":"Casp8−/− and FADD−/− mouse genetics, Zbp1−/− rescue, FLAG-MLKL knock-in reporter model, cGAS/STING/TBK1 inhibition, ZBP1 reconstitution","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple genetic models, novel knock-in reporter, cGAS-STING pathway dependency established; multiple orthogonal methods","pmids":["36191211"],"is_preprint":false},{"year":2023,"finding":"ZBP1 stabilizes Z-form mitochondrial DNA (mtDNA) and nucleates a cytosolic complex containing cGAS, RIPK1, and RIPK3 on destabilized mitochondrial genomes to sustain STAT1 phosphorylation and type I IFN signaling. ZBP1-deficient mice are protected from doxorubicin-induced cardiotoxicity.","method":"ZBP1 KO mice, Z-DNA detection in cardiomyocytes, co-immunoprecipitation of ZBP1-cGAS-RIPK1-RIPK3 complex, STAT1 phosphorylation assays, doxorubicin cardiotoxicity model","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP of multi-protein complex, ZBP1 KO with molecular and physiological phenotype, Z-DNA detection, multiple orthogonal approaches","pmids":["37352855"],"is_preprint":false},{"year":2023,"finding":"A crisis-associated isoform of ZBP1 is induced by cGAS-STING signaling and binds telomeric-repeat-containing RNA (TERRA) transcripts from dysfunctional telomeres; TERRA-bound ZBP1 oligomerizes into filaments on the outer mitochondrial membrane and activates the MAVS innate immune adapter to trigger a lethal interferon response, driving replicative crisis.","method":"ZBP1 isoform characterization, TERRA-ZBP1 binding assays, mitochondrial membrane localization by imaging, MAVS co-immunoprecipitation, ZBP1 oligomerization assays, cGAS/STING inhibition","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Moderate — TERRA binding demonstrated, mitochondrial localization shown, MAVS Co-IP, ZBP1 oligomerization characterized; multiple orthogonal methods in single study","pmids":["36755096"],"is_preprint":false},{"year":2024,"finding":"ZBP1 causes skin inflammation by inducing both RIPK3-mediated necroptosis and RIPK1-caspase-8-mediated apoptosis in keratinocytes; ZBP1-induced caspase-8-mediated inflammation requires RHIM-dependent but kinase-activity-independent RIPK1 signaling. Complete prevention of skin inflammation requires combined deficiency in MLKL and caspase-8, and no cell-death-independent inflammatory signaling by ZBP1 was detected.","method":"Transgenic constitutively active ZBP1 (ZBP1ca) mouse epidermis model, MLKL/caspase-8 double KO, RIPK1 kinase-dead knock-in, histopathology, cytokine measurement","journal":"Cell death and differentiation","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple genetic mouse models, RHIM-dependence established, kinase-independent function defined; multiple orthogonal approaches","pmids":["38849574"],"is_preprint":false},{"year":2024,"finding":"STING upregulates both ZBP1 and MLKL transcriptionally; combined caspase-8 deficiency and STING-driven Z-nucleic acid accumulation activates ZBP1 and triggers formation of a ZBP1-RIPK1-RIPK3 complex independently of the FADD-RIPK1-RIPK3 complex, enabling necroptosis execution. STING and ZBP1 act as overlapping drivers of lethal dermatitis.","method":"Casp8E-KO mouse model, genetic deletion of STING/ZBP1/RIPK3, biochemical Co-IP of ZBP1-RIPK1-RIPK3 complex, SAVI preclinical mouse model rescue by Ripk3 co-deletion","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple genetic mouse models, Co-IP demonstrating distinct complex, SAVI model validation; multiple orthogonal approaches","pmids":["40834903"],"is_preprint":false},{"year":2024,"finding":"RIPK1's death domain (DD) is required to restrain ZBP1-mediated necroptosis; mutation R588E in the RIPK1 DD allows ZBP1 to activate RIPK3 independently of RIPK1 kinase activity, revealing that DD-dependent oligomerization and FADD interaction determine the mechanism of RIPK3 activation by ZBP1.","method":"Ripk1R588E/R588E knock-in mouse genetics, biochemical mechanistic studies, RIPK3 activation assays, comparison to RHIM mutant backgrounds","journal":"Immunity","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — knock-in mouse model, mechanistic biochemical studies; single lab, moderately complex experimental design","pmids":["38744293"],"is_preprint":false},{"year":2024,"finding":"ZBP1 condensate formation via its Zαβ domain facilitates Z-nucleic acid binding and antiviral signal transduction; ZBP1 Zαβ dimerizes in a concentration-dependent manner, forms liquid-liquid phase-separated droplets upon Z-DNA/Z-RNA binding, and full-length ZBP1 forms amyloid-like puncta. RHIM domains form amyloid fibrils that cross-polymerize with RIPK1 depending on the 206IQIG209 core motif; RHIM-mutated ZBP1 impedes necroptosis.","method":"DLS, SAXS, in vitro condensate assays, in-cell imaging of amyloid-like puncta, RHIM domain mutagenesis, necroptosis assays in HT-29 cells, HSV/IAV infection models","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — in vitro biophysical characterization (DLS, SAXS) plus cellular mutagenesis and functional readout; single lab","pmids":["38982083"],"is_preprint":false},{"year":2025,"finding":"Host cell-encoded Z-RNAs (not viral Z-RNAs) are major and sufficient ZBP1-activating ligands during HSV-1 and IAV infection; these Z-RNAs map to intergenic endogenous retroelements embedded in abnormally long 3' extensions of host mRNAs generated by virus-driven disruption of transcription termination (DoTT) via inhibition of CPSF. Mutant viruses lacking ICP27 or NS1 (the CPSF inhibitors) fail to induce host Z-RNA accrual and show attenuated ZBP1 activation.","method":"Z-RNA mapping by sequencing in HSV/IAV-infected cells, ICP27/NS1 viral mutants, ectopic expression of ICP27/NS1, pharmacological CPSF blockade, ZBP1 KO controls","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple viral mutants, ectopic expression, pharmacological inhibition, ZBP1 KO specificity controls, Z-RNA sequencing; multiple orthogonal approaches in high-impact journal","pmids":["41082924"],"is_preprint":false},{"year":2024,"finding":"A shorter alternatively-spliced ZBP1 isoform (ZBP1-S) containing Zα domains but lacking RHIMs acts as an endogenous inhibitor of full-length ZBP1-L by competing for Z-nucleic acid ligand binding, thereby suppressing ZBP1-L-mediated cell death and inflammation. Loss of ZBP1-S accelerates skin inflammation induced by ZBP1-mediated necroptosis.","method":"ZBP1-S-only knock-in mouse model, ZBP1-S KO mouse, cell death assays comparing ZBP1-S/ZBP1-L combinations, skin inflammation model","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Moderate — isoform-specific knock-in mouse models, multiple functional readouts, defined mechanism of competitive Z-nucleic acid binding; multiple orthogonal approaches","pmids":["39300211"],"is_preprint":false},{"year":2017,"finding":"ZBP1 (as zipcode binding protein 1/IGF2BP1 for β-actin mRNA): the KH3-KH4 di-domain of ZBP1 mediates β-actin mRNA recognition; KH4 recognizes a non-canonical GGA sequence via an enlarged dynamic hydrophobic groove, KH3 binds a core CA sequence with low specificity. Data-informed kinetic simulation reveals the overall binding reaction is driven by the second (KH4) binding event; ZBP1 concentration modulates the interaction.","method":"High-resolution NMR structures of KH3-KH4 with target RNA, kinetic binding simulation, affinity measurements","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 1 / Moderate — NMR structural determination plus kinetic simulation and binding assays; structural validation of RNA recognition mechanism","pmids":["28147274"],"is_preprint":false},{"year":2007,"finding":"ZBP1 (as zipcode binding protein 1) expression in metastatic tumor cells restores β-actin mRNA localization to lamellipodia, increases cell polarity, and reduces chemotaxis and tumor cell motility/invasion in vivo, establishing ZBP1 as a regulator of actin mRNA-dependent cell polarity.","method":"ZBP1 overexpression in MTLn3 cells, mRNA localization imaging, chemotaxis assays, multiphoton in vivo tumor imaging","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — overexpression with defined mRNA localization readout, in vitro and in vivo functional assays; single lab","pmids":["17878234"],"is_preprint":false},{"year":2023,"finding":"ZBP1 senses mitochondrial Z-form DNA and interacts with RIPK1 to activate RIPK1 kinase activity, inducing transcription of pro-inflammatory molecules via NF-κB in AD microglia; deletion of Zbp1 or inhibition of RIPK1 attenuates neuroinflammation and Aβ pathology in an AD mouse model. Amyloid-β-induced oxidative stress fragments and releases mtDNA into the cytoplasm where it forms Z-DNA.","method":"ZBP1 KO AD mouse model, RIPK1 inhibitor, Co-IP of ZBP1-RIPK1, Z-DNA detection in microglia, Aβ pathology and behavioral assays","journal":"Immunity","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ZBP1 KO mouse model with defined molecular pathway, Co-IP, Z-DNA detection; single lab, multiple readouts","pmids":["40902587"],"is_preprint":false},{"year":2013,"finding":"DAI/ZBP1 suppresses HSV-1 replication in a DNA-sensing-independent manner requiring the Zβ and D3 domains (but not Zα). DAI colocalizes with the viral E3 ubiquitin ligase ICP0 in nuclear and cytoplasmic foci and co-immunoprecipitates with ICP0; DAI's anti-HSV-1 effect is not observed with ICP0-deleted mutant virus.","method":"DAI knockdown and overexpression in HepG2 cells, domain deletion mutants, co-immunoprecipitation of DAI-ICP0, viral replication assays","journal":"Journal of virology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — domain-specific mutagenesis, Co-IP of DAI-ICP0 interaction, viral replication assays; single lab","pmids":["23283962"],"is_preprint":false},{"year":2024,"finding":"ZBP1 is amplified by palmitic acid-activated JNK pathway in steatotic livers; upon I/R injury, excessive ROS trigger ZBP1 activation by inducing its aggregation independently of Z-nucleic acid sensing, leading to RIPK1 kinase activation and downstream apoptosis and inflammation.","method":"ZBP1 KO mouse steatotic liver I/R model, JNK inhibition, RIPK1 kinase inhibitor, ZBP1 aggregation assays, ROS measurement","journal":"The Journal of clinical investigation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ZBP1 KO with defined mechanistic pathway, biochemical aggregation assays; single lab","pmids":["38743492"],"is_preprint":false},{"year":2023,"finding":"TRIM32 is an E3 ubiquitin ligase that targets ZBP1 for proteasomal degradation; the cold-inducible RNA-binding protein CIRP competes with TRIM32 for ZBP1 binding (stabilizing ZBP1) when internalized into pulmonary endothelial cells via TLR4-mediated endocytosis during sepsis, thereby enhancing ZBP1-RIPK3-dependent PANoptosis.","method":"IP/MS identification of TRIM32, co-immunoprecipitation of CIRP-ZBP1 and TRIM32-ZBP1, ZBP1 ubiquitination/degradation assays, Zbp1−/− mouse sepsis model","journal":"Military Medical Research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — IP/MS plus Co-IP of competing interactions, ubiquitination biochemistry, ZBP1 KO mouse model; single lab","pmids":["39465383"],"is_preprint":false},{"year":2008,"finding":"Human ZBP1 (hZBP1) overexpression does not affect IFN-β or IL-8 production induced by intracellular bacteria or cytosolic poly(dA-dT) in human A549 cells, and multiple hZBP1 siRNAs do not suppress IFN-β responses in human cells, indicating that human ZBP1 is not required for cytosolic DNA-induced IFN-β responses in human cells (NEGATIVE FINDING for the sensor function in human cells).","method":"hZBP1 siRNA knockdown in human cells, hZBP1 overexpression, IFN-β reporter and ELISA assays, comparison with mouse L929 cells","journal":"Cellular microbiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple siRNA constructs, overexpression controls, human vs mouse cell comparison; negative result replicated with multiple approaches","pmids":["18771559"],"is_preprint":false}],"current_model":"ZBP1 is an interferon-inducible innate immune sensor that detects Z-form DNA and Z-RNA (including viral Z-RNAs generated during IAV/HSV/VACV infection and endogenous Z-RNAs from retroelements) via its Zα1/Zα2 domains, and signals through two RHIM domains to recruit and activate RIPK3 (and, in some contexts, RIPK1) to drive PANoptosis—comprising necroptosis (via RIPK3-MLKL), apoptosis (via caspase-8), and pyroptosis (via NLRP3 inflammasome)—as well as NF-κB- and IRF3-dependent inflammation; this activity is negatively regulated by RIPK1's own RHIM (which competes with ZBP1 for RIPK3), by ADAR1 (which edits endogenous dsRNA to prevent Z-RNA formation and directly interacts with ZBP1's Zα2 domain), and by a short ZBP1 isoform that lacks RHIMs and competes for Z-nucleic acid binding, while ZBP1 also senses mitochondrial Z-DNA to cooperate with cGAS and activate MAVS on mitochondria and sustains type I IFN signaling via a ZBP1-cGAS-RIPK complex."},"narrative":{"mechanistic_narrative":"ZBP1 (DAI/DLM-1) is an interferon-inducible innate immune sensor that detects Z-form nucleic acids through its N-terminal Zα domains and converts this recognition into RHIM-dependent activation of cell death and inflammatory signaling [PMID:17618271, PMID:11524677, PMID:28716805]. Structural work defined the Zα winged-helix fold that recognizes left-handed Z-DNA via a structure-specific core shared with ADAR1 [PMID:11524677], and ZBP1 binds both Z-DNA and Z-RNA, with Zα1/Zα2 mutations abolishing ligand engagement and downstream cell death [PMID:28716805, PMID:28607035]. Ligand binding drives ZBP1 oligomerization—self-association via its N-terminal/Zαβ region and condensate/amyloid-like assembly—as the activating step [PMID:18375758, PMID:31076724, PMID:38982083]. Activated ZBP1 uses its two RHIM domains to recruit RIPK3 and RIPK1, nucleating signaling that drives PANoptosis: RIPK3-MLKL necroptosis, RIPK1-caspase-8 apoptosis, and inflammasome-linked pyroptosis, alongside NF-κB- and IRF3-dependent inflammation [PMID:19590578, PMID:27746097, PMID:31358656, PMID:38849574]. This pathway senses viral Z-RNAs during IAV, MCMV, HSV-1, and vaccinia infection [PMID:22423968, PMID:27746097, PMID:28607035, PMID:34192517], and the relevant ligands include host cell-encoded Z-RNAs from endogenous retroelements in aberrant transcripts generated when viruses disrupt transcription termination [PMID:41082924]; influenza-induced nuclear Z-RNA can drive 'inside-out' nuclear necroptosis with nuclear-envelope disruption [PMID:32200799]. ZBP1 signaling is restrained at multiple levels: RIPK1's RHIM and death domain compete for RIPK3 to prevent constitutive activation [PMID:27819681, PMID:27819682, PMID:38744293], ADAR1 edits endogenous dsRNA and directly binds the Zα2 domain to block ZBP1-RIPK3 engagement [PMID:34686350, PMID:35859175, PMID:35859177, PMID:35859176], caspase-8/FADD suppress spontaneous ZBP1 expression [PMID:36191211], and a short RHIM-lacking isoform competes for Z-nucleic acid binding [PMID:39300211]. Beyond infection, ZBP1 senses Z-form mitochondrial DNA to nucleate a cGAS-RIPK1-RIPK3 complex that sustains type I IFN signaling and contributes to doxorubicin cardiotoxicity, and a crisis-associated isoform binds TERRA to activate MAVS on mitochondria [PMID:37352855, PMID:36755096]. Separately, the same gene product functions as zipcode-binding protein 1 in β-actin mRNA localization, where its KH3-KH4 di-domain recognizes the actin zipcode to control cell polarity and motility [PMID:28147274, PMID:17878234]. Human ZBP1 is not required for cytosolic DNA-induced IFN-β responses in human cells, distinguishing it from the mouse DNA-sensor role [PMID:18771559].","teleology":[{"year":2001,"claim":"Established the structural basis of Z-nucleic acid recognition, defining the Zα domain fold that would later explain ZBP1 ligand specificity.","evidence":"X-ray crystallography of the DLM-1/ZBP1 Zα domain bound to Z-DNA","pmids":["11524677"],"confidence":"High","gaps":["Did not address full-length protein assembly","No downstream signaling function defined at this stage"]},{"year":2007,"claim":"Identified ZBP1 as a cytosolic DNA sensor that activates type I IFN, answering what links cytosolic DNA to the IRF3-TBK1 axis.","evidence":"siRNA knockdown, Co-IP, and reporter assays in mouse fibroblasts","pmids":["17618271"],"confidence":"High","gaps":["Did not resolve whether B-DNA or Z-DNA is the physiological ligand","Did not establish redundancy with other DNA sensors"]},{"year":2007,"claim":"Defined a distinct mRNA-localization function of the same gene product (zipcode-binding protein 1) in controlling β-actin mRNA targeting and cell motility.","evidence":"Overexpression, mRNA localization imaging, chemotaxis and in vivo tumor imaging in metastatic cells","pmids":["17878234"],"confidence":"Medium","gaps":["Relationship between RNA-localization and immune-sensor functions unresolved","Single-cell-type system"]},{"year":2008,"claim":"Showed that dimerization is the key activation step and that multiple DNA-binding domains are required, framing oligomerization as the trigger for signaling.","evidence":"Domain mutagenesis and forced-dimerization constructs with reporter assays","pmids":["18375758"],"confidence":"High","gaps":["Did not define the physiological dimerization trigger","Mechanism of RHIM engagement not yet shown"]},{"year":2008,"claim":"Tested whether the DNA-sensor role generalizes to human cells and found it does not, revealing a species-specific limitation of the IFN-sensor function.","evidence":"siRNA knockdown and overexpression with IFN-β readouts in human A549 cells vs mouse cells","pmids":["18771559"],"confidence":"Medium","gaps":["Negative result does not exclude other human ZBP1 functions","Did not assess Z-RNA or cell-death roles in human cells"]},{"year":2009,"claim":"Connected ZBP1 to RHIM-dependent kinase recruitment, showing it relays signals to RIPK1/RIPK3 and is targeted by viral RHIM mimics.","evidence":"Co-IP, siRNA knockdown of RIPK1/RIPK3, NF-κB reporter assays, MCMV M45 analysis","pmids":["19590578"],"confidence":"High","gaps":["Cell-death versus NF-κB branching not resolved","Did not establish in vivo relevance"]},{"year":2012,"claim":"Demonstrated that ZBP1-RIPK3 complexes drive virus-induced programmed necrosis in vivo, establishing the necroptotic arm of ZBP1 signaling.","evidence":"Co-IP, Zbp1−/− mouse genetics, MCMV pathogenesis and viral vIRA evasion","pmids":["22423968"],"confidence":"High","gaps":["Did not identify the activating viral ligand","MLKL involvement not yet shown"]},{"year":2016,"claim":"Extended ZBP1 sensing to RNA viruses, showing IAV vRNP detection drives RIPK3-mediated necroptosis and apoptosis.","evidence":"Zbp1 KO/KD cells and mice, RIPK3 Co-IP, cell death assays","pmids":["27746097"],"confidence":"High","gaps":["Did not define the Z-RNA nature of the ligand","Upstream priming requirements unclear"]},{"year":2016,"claim":"Revealed RIPK1's RHIM as a brake on ZBP1, explaining how ZBP1-RIPK3 necroptosis is held in check during development.","evidence":"Ripk1 RHIM knock-in mice, Co-IP of ZBP1-RIPK3, Zbp1−/− rescue, pRIPK3 blots","pmids":["27819681","27819682"],"confidence":"High","gaps":["Did not define the endogenous activating ligand in this setting","Mechanism of RHIM competition at structural level unresolved"]},{"year":2017,"claim":"Identified Z-RNA as the activating ligand by showing Zα mutations abolish necroptosis and that viral transcription, not DNA replication, is required.","evidence":"Zα domain knock-in mutants, MCMV infection assays, RNA cross-linking, viral mutants","pmids":["28716805","28607035"],"confidence":"High","gaps":["Precise Z-RNA species not mapped","Did not address host versus viral RNA origin"]},{"year":2017,"claim":"Clarified ZBP1 domain architecture for activation and upstream priming, mapping self-interaction to the N-terminus and showing RIG-I-MAVS-IFN dependence and ZBP1 ubiquitination.","evidence":"Domain deletion Co-IP, RIG-I/MAVS KO cells, ubiquitination and vRNP pulldown assays","pmids":["31076724","28634194"],"confidence":"Medium","gaps":["Ubiquitin ligase not identified at this stage","Single-lab studies"]},{"year":2019,"claim":"Showed ZBP1-RIPK3 can act independently of RIPK1 downstream of IFN and can restrict viruses via immunometabolism rather than death, broadening outcome diversity.","evidence":"Zbp1−/− in Ripk1−/− background, JAK/STAT inhibition; ZIKV neuron model with metabolomics and IRG1/itaconate analysis","pmids":["31358656","30635240"],"confidence":"High","gaps":["Determinants selecting death versus metabolic restriction unclear","Cell-type specificity of outcomes not resolved"]},{"year":2020,"claim":"Demonstrated nuclear ZBP1 signaling and sterile activation by endogenous Z-nucleic acids, establishing ZBP1 as a sensor of self retroelement-derived dsRNA.","evidence":"IAV Z-RNA detection, nuclear RIPK3/MLKL imaging, multiple Ripk1/FADD mutant mice with Zbp1−/− rescue, nuclear export inhibition, RNA cross-linking","pmids":["32200799","32296175"],"confidence":"High","gaps":["Identity of specific endogenous retroelement transcripts incomplete","Trigger that overcomes normal suppression in disease not fully defined"]},{"year":2021,"claim":"Established ADAR1 as a direct negative regulator binding the Zα2 domain to block ZBP1-RIPK3 engagement and PANoptosis.","evidence":"ADAR1-ZBP1 Co-IP, Zα2 deletion knock-in mice, conditional ADAR1 KO, tumor and PANoptosis assays","pmids":["34686350"],"confidence":"High","gaps":["Whether suppression is purely editing-dependent or also via direct binding not fully separated","Structural basis of ADAR1-Zα2 contact unresolved"]},{"year":2021,"claim":"Placed ZBP1 within larger inflammatory-death complexes and TRIF/RIPK1 pathways, showing constitutive RIPK1 binding and incorporation into AIM2-containing PANoptosomes.","evidence":"ZBP1-RIPK1 Co-IP and KO in LPS/Yersinia models; multi-protein PANoptosome Co-IP with AIM2/pyrin KO in HSV-1/F. novicida infection","pmids":["33397971","34471287"],"confidence":"Medium","gaps":["Stoichiometry and assembly order of the PANoptosome unresolved","Whether ZBP1-RIPK1 binding is ligand-dependent unclear"]},{"year":2021,"claim":"Defined viral evasion by Zα competition, showing vaccinia E3 sequesters Z-RNA via its own Zα domain to block ZBP1 necroptosis.","evidence":"E3 Zα mutant VACV, Z-RNA detection, ZBP1/RIPK3/MLKL KO cells, Zα domain swaps","pmids":["34192517"],"confidence":"High","gaps":["Quantitative ligand competition not measured","Generalizability across poxviruses untested"]},{"year":2022,"claim":"Confirmed and extended the ADAR1-ZBP1 axis, showing Alu-derived Z-RNA accumulation upon loss of ADAR1's Zα domain drives ZBP1-dependent death, fully rescued by ZBP1 ablation.","evidence":"Adar1 Zα-mutant and KO mice with Zbp1−/− rescue, cell death readouts, Alu RNA-seq; CBL0137 Z-DNA induction in fibroblasts","pmids":["35859175","35859177","35859176","35614224"],"confidence":"High","gaps":["Therapeutic window of pharmacologic ZBP1 activation undefined","Tissue-specific contributions of editing loss incomplete"]},{"year":2022,"claim":"Defined cell-death-independent inflammatory signaling, showing ZBP1 scaffolds RIPK1/RIPK3-dependent ubiquitination and TLR3/4 inflammatory amplification.","evidence":"Co-IP of ZBP1-RIPK1-RIPK3-cIAP1-LUBAC, ubiquitin pulldowns, kinase-dead mutants in human cells; ZBP1-RIPK1-TRIF Co-IP and LPS sepsis mouse model","pmids":["36268590","35666872"],"confidence":"Medium","gaps":["Relative contribution of scaffolding versus death signaling in vivo unclear","Single-lab human/mouse systems"]},{"year":2022,"claim":"Showed caspase-8/FADD suppress spontaneous ZBP1 expression via a cGAS-STING-TBK1 feedback loop, defining a transcriptional brake on sterile ZBP1 necroptosis.","evidence":"Casp8−/− and FADD−/− mice with Zbp1−/− rescue, FLAG-MLKL knock-in reporter, cGAS/STING/TBK1 inhibition","pmids":["36191211"],"confidence":"High","gaps":["Direct transcriptional regulators of Zbp1 not mapped","Ligand driving spontaneous activation undefined"]},{"year":2023,"claim":"Extended ZBP1 sensing to mitochondrial Z-DNA and TERRA, revealing it nucleates cGAS-RIPK or MAVS complexes to sustain IFN and drive crisis or cardiotoxicity.","evidence":"ZBP1 KO mice, Z-DNA detection, ZBP1-cGAS-RIPK Co-IP, STAT1 phosphorylation, doxorubicin model; crisis isoform TERRA binding, mitochondrial imaging, MAVS Co-IP, oligomerization assays","pmids":["37352855","36755096"],"confidence":"High","gaps":["How Z-DNA stabilization on mtDNA is regulated unclear","Isoform-specific localization determinants incomplete"]},{"year":2024,"claim":"Resolved the molecular basis of RIPK1's restraint and the biophysics of ZBP1 assembly, defining RHIM amyloid cross-polymerization and condensate formation as activation steps.","evidence":"Ripk1 R588E DD knock-in mice; DLS/SAXS, in vitro condensate and amyloid assays, RHIM mutagenesis with necroptosis readout","pmids":["38744293","38982083"],"confidence":"Medium","gaps":["High-resolution structure of the activated ZBP1-RIPK3 fibril lacking","In vivo relevance of phase separation untested"]},{"year":2024,"claim":"Dissected ZBP1-driven inflammatory disease, showing it executes both necroptosis and kinase-independent RIPK1-caspase-8 apoptosis, with STING upregulating ZBP1 and forming a FADD-independent ZBP1-RIPK1-RIPK3 complex in dermatitis.","evidence":"ZBP1ca transgenic and Casp8E-KO mice with MLKL/caspase-8/STING/RIPK3 deletions, Co-IP, SAVI model rescue, RIPK1 kinase-dead knock-in","pmids":["38849574","40834903"],"confidence":"High","gaps":["Endogenous triggers in human SAVI not fully defined","Balance between necroptotic and apoptotic arms across tissues unresolved"]},{"year":2024,"claim":"Identified endogenous regulators of ZBP1: a short RHIM-lacking isoform that competes for Z-RNA, and ligand-independent activation via aggregation and degradation control.","evidence":"ZBP1-S knock-in and KO mice, isoform combination death assays; steatotic liver I/R model with ZBP1 aggregation; TRIM32/CIRP ubiquitination and Co-IP in sepsis","pmids":["39300211","38743492","39465383"],"confidence":"Medium","gaps":["Regulation of isoform splicing ratio in disease unclear","Whether ROS-induced aggregation uses the same RHIM interface as Z-nucleic acid sensing unresolved"]},{"year":2025,"claim":"Pinpointed host-encoded retroelement Z-RNAs—generated by virus-driven disruption of transcription termination—as the major sufficient ZBP1 ligands during HSV-1 and IAV infection.","evidence":"Z-RNA sequencing, ICP27/NS1 viral mutants and ectopic expression, CPSF blockade, ZBP1 KO controls","pmids":["41082924"],"confidence":"High","gaps":["Whether all ZBP1-activating contexts share this host-RNA origin unknown","Structural definition of these Z-RNAs at the Zα interface lacking"]},{"year":null,"claim":"How the diverse ZBP1 ligands (viral and host Z-RNA, mitochondrial Z-DNA, TERRA, stress-induced aggregation) are integrated to select between necroptosis, apoptosis, pyroptosis, metabolic restriction, and IFN output remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unifying structural model of activated ZBP1 signaling complexes","Determinants of outcome selection across cell types undefined","Human-specific ZBP1 functions versus mouse remain incompletely mapped"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[8,14,26,31,33]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[0,1,2,25]},{"term_id":"GO:0140299","term_label":"molecular sensor activity","supporting_discovery_ids":[0,8,25]},{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[3,5,4]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[3,23,33]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[0,3,25]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[14,15]},{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[25,26]}],"pathway":[{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[4,5,13,14,27]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[0,3,17,22,25]},{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[33,34]}],"complexes":["ZBP1-RIPK3 necroptosome","AIM2-ZBP1 PANoptosome","ZBP1-cGAS-RIPK1-RIPK3 mitochondrial complex","TRIFosome (FADD-RIPK1-caspase-8)"],"partners":["RIPK3","RIPK1","ADAR1","CGAS","AIM2","MAVS","TRIM32","CIRP"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9H171","full_name":"Z-DNA-binding protein 1","aliases":["DNA-dependent activator of IFN-regulatory factors","DAI","Tumor stroma and activated macrophage protein DLM-1"],"length_aa":429,"mass_kda":46.3,"function":"Key innate sensor that recognizes and binds Z-RNA structures, which are produced by a number of viruses, such as herpesvirus, orthomyxovirus or flavivirus, and triggers different forms of cell death (PubMed:32200799). ZBP1 acts as an essential mediator of pyroptosis, necroptosis and apoptosis (PANoptosis), an integral part of host defense against pathogens, by activating RIPK3, caspase-8 (CASP8), and the NLRP3 inflammasome (By similarity). Key activator of necroptosis, a programmed cell death process in response to death-inducing TNF family members, via its ability to bind Z-RNA: once activated upon Z-RNA-binding, ZBP1 interacts and stimulates RIPK3 kinase, which phosphorylates and activates MLKL, triggering execution of programmed necrosis (By similarity). In addition to TNF-induced necroptosis, necroptosis can also take place in the nucleus in response to orthomyxoviruses infection: ZBP1 recognizes and binds Z-RNA structures that are produced in infected nuclei by orthomyxoviruses, such as the influenza A virus (IAV), leading to ZBP1 activation, RIPK3 stimulation and subsequent MLKL phosphorylation, triggering disruption of the nuclear envelope and leakage of cellular DNA into the cytosol (PubMed:32200799). ZBP1-dependent cell death in response to IAV infection promotes interleukin-1 alpha (IL1A) induction in an NLRP3-inflammasome-independent manner: IL1A expression is required for the optimal interleukin-1 beta (IL1B) production, and together, these cytokines promote infiltration of inflammatory neutrophils to the lung, leading to the formation of neutrophil extracellular traps (By similarity). In addition to its direct role in driving necroptosis via its ability to sense Z-RNAs, also involved in PANoptosis triggered in response to bacterial infection: component of the AIM2 PANoptosome complex, a multiprotein complex that triggers PANoptosis (By similarity). Also acts as the apical sensor of fungal infection responsible for activating PANoptosis (By similarity). Involved in CASP8-mediated cell death via its interaction with RIPK1 but independently of its ability to sense Z-RNAs (By similarity). In some cell types, also able to restrict viral replication by promoting cell death-independent responses (By similarity). In response to Zika virus infection in neurons, promotes a cell death-independent pathway that restricts viral replication: together with RIPK3, promotes a death-independent transcriptional program that modifies the cellular metabolism via up-regulation expression of the enzyme ACOD1/IRG1 and production of the metabolite itaconate (By similarity). Itaconate inhibits the activity of succinate dehydrogenase, generating a metabolic state in neurons that suppresses replication of viral genomes (By similarity) (Microbial infection) In case of herpes simplex virus 1/HHV-1 infection, forms hetero-amyloid structures with HHV-1 protein RIR1/ICP6 which may inhibit ZBP1-mediated necroptosis, thereby preventing host cell death pathway and allowing viral evasion","subcellular_location":"Cytoplasm; Nucleus","url":"https://www.uniprot.org/uniprotkb/Q9H171/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/ZBP1","classification":"Not Classified","n_dependent_lines":1,"n_total_lines":1208,"dependency_fraction":0.0008278145695364238},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/ZBP1","total_profiled":1310},"omim":[{"mim_id":"615153","title":"MIXED LINEAGE KINASE DOMAIN-LIKE PROTEIN; MLKL","url":"https://www.omim.org/entry/615153"},{"mim_id":"608288","title":"INSULIN-LIKE GROWTH FACTOR 2 mRNA-BINDING PROTEIN 1; IGF2BP1","url":"https://www.omim.org/entry/608288"},{"mim_id":"608107","title":"MEFV INNATE IMMUNITY REGULATOR, PYRIN; MEFV","url":"https://www.omim.org/entry/608107"},{"mim_id":"606750","title":"Z-DNA BINDING PROTEIN 1; ZBP1","url":"https://www.omim.org/entry/606750"},{"mim_id":"605817","title":"RECEPTOR-INTERACTING SERINE/THREONINE KINASE 3; RIPK3","url":"https://www.omim.org/entry/605817"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"bone marrow","ntpm":26.9},{"tissue":"lymphoid tissue","ntpm":23.5}],"url":"https://www.proteinatlas.org/search/ZBP1"},"hgnc":{"alias_symbol":["dJ718J7.3","DLM1","DLM-1","DAI"],"prev_symbol":["C20orf183"]},"alphafold":{"accession":"Q9H171","domains":[{"cath_id":"1.10.10.10","chopping":"9-69","consensus_level":"high","plddt":88.9064,"start":9,"end":69},{"cath_id":"1.10.10.10","chopping":"105-165","consensus_level":"high","plddt":90.5998,"start":105,"end":165},{"cath_id":"-","chopping":"186-216_251-276_300-307_319-342","consensus_level":"medium","plddt":56.8815,"start":186,"end":342}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9H171","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9H171-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9H171-F1-predicted_aligned_error_v6.png","plddt_mean":52.91},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=ZBP1","jax_strain_url":"https://www.jax.org/strain/search?query=ZBP1"},"sequence":{"accession":"Q9H171","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9H171.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9H171/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9H171"}},"corpus_meta":[{"pmid":"17618271","id":"PMC_17618271","title":"DAI (DLM-1/ZBP1) is a cytosolic DNA sensor and an activator of innate immune response.","date":"2007","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/17618271","citation_count":1397,"is_preprint":false},{"pmid":"27917412","id":"PMC_27917412","title":"ZBP1/DAI is an innate sensor of influenza virus triggering the NLRP3 inflammasome and programmed cell death pathways.","date":"2016","source":"Science immunology","url":"https://pubmed.ncbi.nlm.nih.gov/27917412","citation_count":706,"is_preprint":false},{"pmid":"34471287","id":"PMC_34471287","title":"AIM2 forms a complex with pyrin and ZBP1 to drive PANoptosis and host defence.","date":"2021","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/34471287","citation_count":635,"is_preprint":false},{"pmid":"22423968","id":"PMC_22423968","title":"DAI/ZBP1/DLM-1 complexes with RIP3 to mediate virus-induced programmed necrosis that is targeted by murine cytomegalovirus vIRA.","date":"2012","source":"Cell host & 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disease","url":"https://pubmed.ncbi.nlm.nih.gov/38982083","citation_count":19,"is_preprint":false},{"pmid":"38402193","id":"PMC_38402193","title":"Apoptosis dysfunction: unravelling the interplay between ZBP1 activation and viral invasion in innate immune responses.","date":"2024","source":"Cell communication and signaling : CCS","url":"https://pubmed.ncbi.nlm.nih.gov/38402193","citation_count":19,"is_preprint":false},{"pmid":"39433574","id":"PMC_39433574","title":"Decoding the multiple functions of ZBP1 in the mechanism of sepsis-induced acute lung injury.","date":"2024","source":"Communications biology","url":"https://pubmed.ncbi.nlm.nih.gov/39433574","citation_count":18,"is_preprint":false},{"pmid":"41082924","id":"PMC_41082924","title":"Host cell Z-RNAs activate ZBP1 during virus infections.","date":"2025","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/41082924","citation_count":17,"is_preprint":false},{"pmid":"39488923","id":"PMC_39488923","title":"Quercetin Protects against Silicon dioxide Particles-induced spleen ZBP1-Mediated PANoptosis by regulating the Nrf2/Drp1/mtDNA axis.","date":"2024","source":"International immunopharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/39488923","citation_count":17,"is_preprint":false},{"pmid":"39300211","id":"PMC_39300211","title":"A shorter splicing isoform antagonizes ZBP1 to modulate cell death and inflammatory responses.","date":"2024","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/39300211","citation_count":16,"is_preprint":false},{"pmid":"39255796","id":"PMC_39255796","title":"Lipolysis engages CD36 to promote ZBP1-mediated necroptosis-impairing lung regeneration in COPD.","date":"2024","source":"Cell reports. Medicine","url":"https://pubmed.ncbi.nlm.nih.gov/39255796","citation_count":15,"is_preprint":false},{"pmid":"38346464","id":"PMC_38346464","title":"Z-nucleic acid sensor ZBP1 in sterile inflammation.","date":"2024","source":"Clinical immunology (Orlando, Fla.)","url":"https://pubmed.ncbi.nlm.nih.gov/38346464","citation_count":15,"is_preprint":false},{"pmid":"39850894","id":"PMC_39850894","title":"ZBP1 senses Brucella abortus DNA triggering type I interferon signaling pathway and unfolded protein response activation.","date":"2025","source":"Frontiers in immunology","url":"https://pubmed.ncbi.nlm.nih.gov/39850894","citation_count":14,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":49967,"output_tokens":10988,"usd":0.15736,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":22022,"output_tokens":7503,"usd":0.148842,"stage2_stop_reason":"end_turn"},"total_usd":0.306202,"stage1_batch_id":"msgbatch_01UT1AahFPCAyn2uVweS7A9z","stage2_batch_id":"msgbatch_01HuKWtKNT4Pqj1bc8eEP5RV","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2007,\n      \"finding\": \"ZBP1/DAI (DLM-1) binds double-stranded DNA directly and, upon binding, enhances its association with IRF3 transcription factor and TBK1 serine/threonine kinase to activate type I interferon gene expression. siRNA knockdown of ZBP1 inhibited DNA-mediated innate immune gene induction, establishing ZBP1 as a cytosolic DNA sensor upstream of the IRF3-TBK1 axis.\",\n      \"method\": \"siRNA knockdown, co-immunoprecipitation, overexpression in mouse fibroblasts, reporter assays\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal binding shown by Co-IP, functional knockdown and overexpression experiments, replicated across multiple DNA sources; foundational paper independently confirmed\",\n      \"pmids\": [\"17618271\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Crystal structure of the DLM-1 (ZBP1) Zα domain bound to left-handed Z-DNA at 1.85 Å resolution revealed a winged-helix fold and a conserved Z-DNA recognition core shared with ADAR1 Zα, defining a family of Z-DNA-binding proteins with a common structure-specific recognition mechanism.\",\n      \"method\": \"X-ray crystallography\",\n      \"journal\": \"Nature structural biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — high-resolution crystal structure with direct structural validation; foundational structural paper\",\n      \"pmids\": [\"11524677\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"ZBP1/DAI requires three DNA-binding domains (Zα1, Zα2, and D3) for full activation of type I IFN in vivo; artificially induced dimerization of DAI causes DNA-independent activation of type I IFN genes, indicating dimerization is a key step in DAI activation.\",\n      \"method\": \"Mutational analysis of DNA-binding domains, forced dimerization constructs, reporter assays, in vitro DNA binding\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — domain mutagenesis plus functional in vitro and in vivo assays, multiple orthogonal approaches in one study\",\n      \"pmids\": [\"18375758\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"ZBP1/DAI contains two RIP homotypic interaction motifs (RHIMs) that recruit RHIM-containing kinases RIPK1 and RIPK3 to relay NF-κB activation signals downstream of cytosolic DNA sensing. RIPK3 knockdown, like RIPK1 knockdown, reduces DAI-induced NF-κB activation. The MCMV protein M45 inhibits RIP recruitment to DAI via its own RHIM domain.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown of RIPK1/RIPK3, NF-κB reporter assays, RHIM domain identification by sequence analysis\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP, functional knockdown with defined pathway readout, multiple orthogonal methods\",\n      \"pmids\": [\"19590578\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"ZBP1/DAI forms a complex with RIPK3 via RHIM-dependent interactions to mediate virus-induced programmed necrosis during MCMV infection. DAI-deficient cells and mice are resistant to MCMV-induced necrosis, and the MCMV vIRA protein suppresses this pathway by targeting the DAI-RIP3 complex.\",\n      \"method\": \"Co-immunoprecipitation, DAI knockdown/knockout cells, Zbp1−/− mouse genetics, viral pathogenesis assays\",\n      \"journal\": \"Cell host & microbe\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — complex formation by Co-IP, reciprocal genetic rescue with Zbp1−/− mice, viral evasion mechanism confirmed; independently replicated\",\n      \"pmids\": [\"22423968\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"ZBP1 senses influenza A virus genomic RNA (vRNPs) and associates with RIPK3, recruiting MLKL and RIPK1 to RIPK3 to trigger both necroptosis and apoptosis. DAI-deficient cells and mice fail to activate RIPK3 in response to IAV, establishing DAI as the link between IAV RNA and RIPK3 activation.\",\n      \"method\": \"DAI knockout/knockdown cells, RIPK3 co-immunoprecipitation, cell death assays, Zbp1−/− mouse infection model\",\n      \"journal\": \"Cell host & microbe\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO with defined molecular phenotype, Co-IP of complex, in vivo mouse model; independently replicated\",\n      \"pmids\": [\"27746097\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"RIPK1's RHIM domain prevents ZBP1 from binding and activating RIPK3; mutation of RIPK1 RHIM (IQIG→AAAA) allows ZBP1 to interact with phosphorylated RIPK3, causing ZBP1-RIPK3-MLKL-dependent necroptosis and perinatal lethality. ZBP1 deficiency prevents necroptosis and skin inflammation in RIPK1-RHIM-mutant and epidermis-specific RIPK1-KO mice.\",\n      \"method\": \"RHIM knock-in mouse genetics, Co-immunoprecipitation, Zbp1−/− mouse genetics, histopathology\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple genetic mouse models with clear mechanistic readout, Co-IP confirming ZBP1-RIPK3 interaction; replicated in two simultaneous Nature papers\",\n      \"pmids\": [\"27819681\", \"27819682\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"The RIPK1 RHIM acts as a brake preventing ZBP1 from engaging RIPK3's RHIM; in RIPK1-RHIM mutant (IQIG→AAAA) mice, ZBP1 constitutively interacts with RIPK3 (but not in WT or RIPK3-RHIM mutant cells), driving RIPK3 autophosphorylation (Thr231/Ser232) and MLKL-dependent perinatal lethality.\",\n      \"method\": \"Knock-in mouse genetics (Ripk1RHIM/RHIM), Co-immunoprecipitation of ZBP1-RIPK3, Zbp1−/− genetic rescue, Western blot for pRIPK3\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple genetic models, direct Co-IP of ZBP1-RIPK3 interaction mapped to RHIM, multiple orthogonal rescue experiments\",\n      \"pmids\": [\"27819682\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"ZBP1 directly binds RNA via its Zα domains; mutation of key amino acids in Zα1 and Zα2 required for Z-nucleic acid binding abolished ZBP1-mediated necroptosis during MCMV infection and upon ZBP1 overexpression. Cell death required RNA synthesis but not viral DNA replication, implicating Z-RNA as the ZBP1 ligand.\",\n      \"method\": \"Reconstitution/knock-in models with ZBP1 Zα domain mutations, MCMV infection cell death assays, RNA cross-linking, viral replication inhibitor experiments\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — mutagenesis of active-site residues plus reconstitution/knock-in models with direct functional readout; ZBP1 cross-linked to endogenous RNA\",\n      \"pmids\": [\"28716805\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"ZBP1 activation during IAV infection requires upstream RIG-I-MAVS-IFN-β signaling; ZBP1 undergoes ubiquitination after IAV infection as a post-translational modification. ZBP1 senses IAV vRNP complexes (not free RNA) to trigger programmed cell death.\",\n      \"method\": \"RIG-I/MAVS KO cells, IFN-β signaling inhibition, ubiquitination assays, vRNP pulldown, cell death assays\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple genetic knockouts with defined functional readout, ubiquitination shown biochemically; single lab\",\n      \"pmids\": [\"28634194\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"The N-terminal domain of ZBP1 mediates ZBP1-ZBP1 homointeraction, and the RHIM domain in the C-terminal region interacts with RIPK3 to initiate RIPK3-dependent necroptosis downstream of IFN stimulation.\",\n      \"method\": \"Domain deletion constructs, co-immunoprecipitation of ZBP1 self-interaction and ZBP1-RIPK3, IFN-induced necroptosis assays in RIPK1/FADD/caspase-8 KO cells\",\n      \"journal\": \"Cellular & molecular immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP domain mapping, functional cell death assays; single lab, two orthogonal approaches\",\n      \"pmids\": [\"31076724\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"MCMV requires viral IE3-dependent early transcription (not input virion DNA or newly synthesized viral DNA) for DAI/ZBP1-mediated necroptosis; the Zα2 domain of DAI/ZBP1 is required for sensing MCMV and triggering necroptosis, implicating viral RNA transcripts as the relevant ligand.\",\n      \"method\": \"Viral mutants blocking DNA replication/IE3 transcription, Zα2 domain mutation of ZBP1, necroptosis assays\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple viral mutants combined with ZBP1 domain mutagenesis; single lab\",\n      \"pmids\": [\"28607035\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"ZBP1 and RIPK3 activation in ZIKV-infected neurons does not induce necroptosis but instead restricts viral replication by upregulating the enzyme IRG1, leading to itaconate production that inhibits succinate dehydrogenase and suppresses viral genome replication via an immunometabolic mechanism.\",\n      \"method\": \"ZBP1/RIPK3 KO murine neurons, ZIKV infection model, metabolomics, IRG1 KO, itaconate supplementation\",\n      \"journal\": \"Immunity\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple genetic KOs with defined metabolic and viral phenotype, metabolomics, multiple orthogonal approaches in one study\",\n      \"pmids\": [\"30635240\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"ZBP1/DAI drives RIPK3-mediated cell death (necroptosis and apoptosis) in response to IFNs in the absence of RIPK1; IFN-activated JAK/STAT signaling induces ZBP1 expression, which then complexes with RIPK3 to trigger caspase-8-mediated apoptosis and MLKL-driven necroptosis.\",\n      \"method\": \"Zbp1−/− genetics in Ripk1−/− background, JAK/STAT inhibitors, ZBP1-RIPK3 co-immunoprecipitation, Ripk1−/− mouse survival studies\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO in dual-KO background, Co-IP of complex, in vivo survival data; single lab\",\n      \"pmids\": [\"31358656\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Replicating influenza A virus generates Z-RNAs that activate ZBP1 in the nucleus of infected cells; nuclear ZBP1 then initiates RIPK3-mediated MLKL activation in the nucleus, causing nuclear envelope disruption, DNA leakage into cytosol, and 'inside-out' necroptosis. Nuclear MLKL activation potently activates neutrophils.\",\n      \"method\": \"Z-RNA detection in IAV-infected cells, RIPK3/MLKL nuclear localization by imaging, MLKL-deficient mice, neutrophil recruitment assays, survival studies\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — direct Z-RNA detection, live-cell and fixed imaging of nuclear signaling complex, genetic KO mouse model, multiple orthogonal methods; high-impact independently replicated study\",\n      \"pmids\": [\"32200799\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Zα-domain-dependent sensing of endogenous Z-form nucleic acids (Z-DNA/Z-RNA) by ZBP1 triggers RIPK3-dependent necroptosis and inflammation in the absence of viral infection. ZBP1 constitutively binds cellular double-stranded RNA in a Zα-dependent manner; inhibition of nuclear export triggers Zα-dependent RIPK3 activation in the nucleus. Endogenous retroelement-derived dsRNA is implicated as a Zα-domain ligand.\",\n      \"method\": \"Ripk1mR/mR and RIPK1E-KO and FADDIEC-KO mouse models with Zbp1−/− genetic rescue, nuclear export inhibition, Zα domain mutagenesis, ZBP1 RNA cross-linking\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple independent genetic mouse models all rescued by ZBP1 or Zα domain ablation, RNA cross-linking, nuclear export experiments; multiple orthogonal approaches\",\n      \"pmids\": [\"32296175\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"ADAR1 interacts with the Zα2 domain of ZBP1 to suppress ZBP1-RIPK3 interactions and thereby limit ZBP1-mediated PANoptosis. Deletion of ADAR1 (Adar1fl/fl LysMcre) increases ZBP1-dependent cell death; deletion of the ZBP1 Zα2 domain restores tumorigenesis in ADAR1-deficient mice, demonstrating ADAR1 acts as a negative regulator of ZBP1 via Zα2-domain interaction.\",\n      \"method\": \"Co-immunoprecipitation of ADAR1-ZBP1, Zα2 domain deletion knock-in mice, conditional ADAR1 KO, tumor models, PANoptosis assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP of ADAR1-ZBP1 interaction, domain-specific deletion, in vivo genetic rescue experiments, multiple orthogonal approaches\",\n      \"pmids\": [\"34686350\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"AIM2 regulates ZBP1 as part of a large multi-protein PANoptosome complex including AIM2, pyrin, ZBP1, ASC, caspase-1, caspase-8, RIPK3, RIPK1, and FADD; this complex drives inflammatory cell death (PANoptosis). AIM2 is required for ZBP1 integration into the complex during HSV-1 and F. novicida infection.\",\n      \"method\": \"Co-immunoprecipitation of multi-protein complex, AIM2/ZBP1/pyrin KO genetics, infectious disease mouse models, cell death assays\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP of endogenous multi-protein complex, multiple genetic KOs, infectious disease models; published in high-impact journal with multiple orthogonal methods\",\n      \"pmids\": [\"34471287\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"ADAR1 prevents accumulation of endogenous Z-RNAs (from Alu inverted repeat dsRNAs); loss of ADAR1's Zα domain causes ZBP1 activation leading to caspase-8-dependent apoptosis and MLKL-mediated necroptosis. ZBP1 ablation fully rescues overt pathology caused by ADAR1 Zα-domain mutation, positioning ADAR1 as a negative regulator of sterile ZBP1 activation.\",\n      \"method\": \"Adar−/− and Adar1mZα/− mouse genetics combined with Zbp1−/− rescue, cell death assays, RNA-seq for Alu elements\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic rescue experiments in multiple mouse models, multiple cell death readouts, RNA analysis; three simultaneous Nature papers independently confirm ADAR1-ZBP1 axis\",\n      \"pmids\": [\"35859175\", \"35859177\", \"35859176\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"ADAR1 depletion or mutation results in Z-RNA accumulation and ZBP1 activation culminating in RIPK3-mediated necroptosis. The small molecule CBL0137 activates ZBP1 by triggering Z-DNA formation in cells, inducing ZBP1-dependent necroptosis in cancer-associated fibroblasts.\",\n      \"method\": \"ADAR1 KO/mutation in cancer cell lines, Z-RNA detection, ZBP1 KO controls, small molecule (CBL0137) treatment, tumor models\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO controls, small molecule activation with ZBP1 KO specificity control, Z-RNA detection; multiple orthogonal methods\",\n      \"pmids\": [\"35614224\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Vaccinia virus protein E3 prevents ZBP1-mediated necroptosis by competing for Z-form RNA through its N-terminal Zα domain; in the absence of the E3 Zα domain, Z-form RNA accumulates during early VACV infection, triggering ZBP1 to recruit RIPK3 and execute RIPK3-MLKL-dependent necroptosis. Substitution of Zα domains from ZBP1 or ADAR1 into E3 restores necroptosis suppression.\",\n      \"method\": \"E3 Zα mutant VACV, Z-RNA detection, ZBP1/RIPK3/MLKL KO cell lines, domain swap experiments\",\n      \"journal\": \"Cell host & microbe\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — domain swap mutagenesis, multiple genetic KO controls, Z-RNA detection, mechanistic viral evasion study\",\n      \"pmids\": [\"34192517\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"ZBP1 constitutive binding to RIPK1 is essential for TRIFosome (FADD-RIPK1-caspase-8 complex) formation, caspase-8-mediated cell death, and inflammasome activation in response to LPS and Yersinia pseudotuberculosis, positioning ZBP1 as an effector of the TRIF-dependent cell death pathway.\",\n      \"method\": \"ZBP1 KO cells/mice, co-immunoprecipitation of ZBP1-RIPK1, LPS and Yersinia infection models, caspase-8 and inflammasome activity assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP of ZBP1-RIPK1, ZBP1 KO with functional readout, in vivo model; single lab\",\n      \"pmids\": [\"33397971\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"ZBP1 promotes TLR3/TLR4-mediated inflammatory responses by facilitating timely delivery of RIPK1 to TRIF and enabling M1-ubiquitination of RIPK1, sustaining downstream inflammatory signaling cascades; Zbp1−/− mice show resistance to LPS-induced septic shock.\",\n      \"method\": \"Zbp1−/− mouse LPS sepsis model, co-immunoprecipitation of ZBP1-RIPK1-TRIF complex, RIPK1 ubiquitination assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP of ternary complex, ubiquitination biochemistry, in vivo KO mouse model; single lab\",\n      \"pmids\": [\"35666872\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"In human cells, ZBP1 associates with RIPK1, RIPK3, and ubiquitin ligases cIAP1 and LUBAC; ZBP1 promotes K63- and M1-linked ubiquitination of RIPK1 and ZBP1 itself via RIPK1 and RIPK3 as scaffolds (independently of their kinase activity) to activate TAK1- and IKK-mediated inflammatory signaling and cytokine production.\",\n      \"method\": \"Co-immunoprecipitation of ZBP1-RIPK1-RIPK3-cIAP1-LUBAC, ubiquitin chain-specific pulldowns, kinase-dead RIPK1/RIPK3 mutants, cytokine production assays in HT29 cells\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP of multi-protein complex, ubiquitination biochemistry, kinase-dead mutants; single lab, human cell system\",\n      \"pmids\": [\"36268590\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Caspase-8 and FADD suppress spontaneous ZBP1 expression and thereby prevent spontaneous RIPK3-MLKL activation and necroptosis; in Caspase-8-deficient cells, increased ZBP1 expression is maintained by a positive feedback loop requiring cGAS-STING-TBK1 signaling. ZBP1 deletion suppresses spontaneous MLKL phosphorylation in Casp8−/− mice in vivo.\",\n      \"method\": \"Casp8−/− and FADD−/− mouse genetics, Zbp1−/− rescue, FLAG-MLKL knock-in reporter model, cGAS/STING/TBK1 inhibition, ZBP1 reconstitution\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple genetic models, novel knock-in reporter, cGAS-STING pathway dependency established; multiple orthogonal methods\",\n      \"pmids\": [\"36191211\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"ZBP1 stabilizes Z-form mitochondrial DNA (mtDNA) and nucleates a cytosolic complex containing cGAS, RIPK1, and RIPK3 on destabilized mitochondrial genomes to sustain STAT1 phosphorylation and type I IFN signaling. ZBP1-deficient mice are protected from doxorubicin-induced cardiotoxicity.\",\n      \"method\": \"ZBP1 KO mice, Z-DNA detection in cardiomyocytes, co-immunoprecipitation of ZBP1-cGAS-RIPK1-RIPK3 complex, STAT1 phosphorylation assays, doxorubicin cardiotoxicity model\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP of multi-protein complex, ZBP1 KO with molecular and physiological phenotype, Z-DNA detection, multiple orthogonal approaches\",\n      \"pmids\": [\"37352855\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"A crisis-associated isoform of ZBP1 is induced by cGAS-STING signaling and binds telomeric-repeat-containing RNA (TERRA) transcripts from dysfunctional telomeres; TERRA-bound ZBP1 oligomerizes into filaments on the outer mitochondrial membrane and activates the MAVS innate immune adapter to trigger a lethal interferon response, driving replicative crisis.\",\n      \"method\": \"ZBP1 isoform characterization, TERRA-ZBP1 binding assays, mitochondrial membrane localization by imaging, MAVS co-immunoprecipitation, ZBP1 oligomerization assays, cGAS/STING inhibition\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — TERRA binding demonstrated, mitochondrial localization shown, MAVS Co-IP, ZBP1 oligomerization characterized; multiple orthogonal methods in single study\",\n      \"pmids\": [\"36755096\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"ZBP1 causes skin inflammation by inducing both RIPK3-mediated necroptosis and RIPK1-caspase-8-mediated apoptosis in keratinocytes; ZBP1-induced caspase-8-mediated inflammation requires RHIM-dependent but kinase-activity-independent RIPK1 signaling. Complete prevention of skin inflammation requires combined deficiency in MLKL and caspase-8, and no cell-death-independent inflammatory signaling by ZBP1 was detected.\",\n      \"method\": \"Transgenic constitutively active ZBP1 (ZBP1ca) mouse epidermis model, MLKL/caspase-8 double KO, RIPK1 kinase-dead knock-in, histopathology, cytokine measurement\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple genetic mouse models, RHIM-dependence established, kinase-independent function defined; multiple orthogonal approaches\",\n      \"pmids\": [\"38849574\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"STING upregulates both ZBP1 and MLKL transcriptionally; combined caspase-8 deficiency and STING-driven Z-nucleic acid accumulation activates ZBP1 and triggers formation of a ZBP1-RIPK1-RIPK3 complex independently of the FADD-RIPK1-RIPK3 complex, enabling necroptosis execution. STING and ZBP1 act as overlapping drivers of lethal dermatitis.\",\n      \"method\": \"Casp8E-KO mouse model, genetic deletion of STING/ZBP1/RIPK3, biochemical Co-IP of ZBP1-RIPK1-RIPK3 complex, SAVI preclinical mouse model rescue by Ripk3 co-deletion\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple genetic mouse models, Co-IP demonstrating distinct complex, SAVI model validation; multiple orthogonal approaches\",\n      \"pmids\": [\"40834903\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"RIPK1's death domain (DD) is required to restrain ZBP1-mediated necroptosis; mutation R588E in the RIPK1 DD allows ZBP1 to activate RIPK3 independently of RIPK1 kinase activity, revealing that DD-dependent oligomerization and FADD interaction determine the mechanism of RIPK3 activation by ZBP1.\",\n      \"method\": \"Ripk1R588E/R588E knock-in mouse genetics, biochemical mechanistic studies, RIPK3 activation assays, comparison to RHIM mutant backgrounds\",\n      \"journal\": \"Immunity\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — knock-in mouse model, mechanistic biochemical studies; single lab, moderately complex experimental design\",\n      \"pmids\": [\"38744293\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"ZBP1 condensate formation via its Zαβ domain facilitates Z-nucleic acid binding and antiviral signal transduction; ZBP1 Zαβ dimerizes in a concentration-dependent manner, forms liquid-liquid phase-separated droplets upon Z-DNA/Z-RNA binding, and full-length ZBP1 forms amyloid-like puncta. RHIM domains form amyloid fibrils that cross-polymerize with RIPK1 depending on the 206IQIG209 core motif; RHIM-mutated ZBP1 impedes necroptosis.\",\n      \"method\": \"DLS, SAXS, in vitro condensate assays, in-cell imaging of amyloid-like puncta, RHIM domain mutagenesis, necroptosis assays in HT-29 cells, HSV/IAV infection models\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — in vitro biophysical characterization (DLS, SAXS) plus cellular mutagenesis and functional readout; single lab\",\n      \"pmids\": [\"38982083\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Host cell-encoded Z-RNAs (not viral Z-RNAs) are major and sufficient ZBP1-activating ligands during HSV-1 and IAV infection; these Z-RNAs map to intergenic endogenous retroelements embedded in abnormally long 3' extensions of host mRNAs generated by virus-driven disruption of transcription termination (DoTT) via inhibition of CPSF. Mutant viruses lacking ICP27 or NS1 (the CPSF inhibitors) fail to induce host Z-RNA accrual and show attenuated ZBP1 activation.\",\n      \"method\": \"Z-RNA mapping by sequencing in HSV/IAV-infected cells, ICP27/NS1 viral mutants, ectopic expression of ICP27/NS1, pharmacological CPSF blockade, ZBP1 KO controls\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple viral mutants, ectopic expression, pharmacological inhibition, ZBP1 KO specificity controls, Z-RNA sequencing; multiple orthogonal approaches in high-impact journal\",\n      \"pmids\": [\"41082924\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"A shorter alternatively-spliced ZBP1 isoform (ZBP1-S) containing Zα domains but lacking RHIMs acts as an endogenous inhibitor of full-length ZBP1-L by competing for Z-nucleic acid ligand binding, thereby suppressing ZBP1-L-mediated cell death and inflammation. Loss of ZBP1-S accelerates skin inflammation induced by ZBP1-mediated necroptosis.\",\n      \"method\": \"ZBP1-S-only knock-in mouse model, ZBP1-S KO mouse, cell death assays comparing ZBP1-S/ZBP1-L combinations, skin inflammation model\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — isoform-specific knock-in mouse models, multiple functional readouts, defined mechanism of competitive Z-nucleic acid binding; multiple orthogonal approaches\",\n      \"pmids\": [\"39300211\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"ZBP1 (as zipcode binding protein 1/IGF2BP1 for β-actin mRNA): the KH3-KH4 di-domain of ZBP1 mediates β-actin mRNA recognition; KH4 recognizes a non-canonical GGA sequence via an enlarged dynamic hydrophobic groove, KH3 binds a core CA sequence with low specificity. Data-informed kinetic simulation reveals the overall binding reaction is driven by the second (KH4) binding event; ZBP1 concentration modulates the interaction.\",\n      \"method\": \"High-resolution NMR structures of KH3-KH4 with target RNA, kinetic binding simulation, affinity measurements\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — NMR structural determination plus kinetic simulation and binding assays; structural validation of RNA recognition mechanism\",\n      \"pmids\": [\"28147274\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"ZBP1 (as zipcode binding protein 1) expression in metastatic tumor cells restores β-actin mRNA localization to lamellipodia, increases cell polarity, and reduces chemotaxis and tumor cell motility/invasion in vivo, establishing ZBP1 as a regulator of actin mRNA-dependent cell polarity.\",\n      \"method\": \"ZBP1 overexpression in MTLn3 cells, mRNA localization imaging, chemotaxis assays, multiphoton in vivo tumor imaging\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — overexpression with defined mRNA localization readout, in vitro and in vivo functional assays; single lab\",\n      \"pmids\": [\"17878234\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"ZBP1 senses mitochondrial Z-form DNA and interacts with RIPK1 to activate RIPK1 kinase activity, inducing transcription of pro-inflammatory molecules via NF-κB in AD microglia; deletion of Zbp1 or inhibition of RIPK1 attenuates neuroinflammation and Aβ pathology in an AD mouse model. Amyloid-β-induced oxidative stress fragments and releases mtDNA into the cytoplasm where it forms Z-DNA.\",\n      \"method\": \"ZBP1 KO AD mouse model, RIPK1 inhibitor, Co-IP of ZBP1-RIPK1, Z-DNA detection in microglia, Aβ pathology and behavioral assays\",\n      \"journal\": \"Immunity\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ZBP1 KO mouse model with defined molecular pathway, Co-IP, Z-DNA detection; single lab, multiple readouts\",\n      \"pmids\": [\"40902587\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"DAI/ZBP1 suppresses HSV-1 replication in a DNA-sensing-independent manner requiring the Zβ and D3 domains (but not Zα). DAI colocalizes with the viral E3 ubiquitin ligase ICP0 in nuclear and cytoplasmic foci and co-immunoprecipitates with ICP0; DAI's anti-HSV-1 effect is not observed with ICP0-deleted mutant virus.\",\n      \"method\": \"DAI knockdown and overexpression in HepG2 cells, domain deletion mutants, co-immunoprecipitation of DAI-ICP0, viral replication assays\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — domain-specific mutagenesis, Co-IP of DAI-ICP0 interaction, viral replication assays; single lab\",\n      \"pmids\": [\"23283962\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"ZBP1 is amplified by palmitic acid-activated JNK pathway in steatotic livers; upon I/R injury, excessive ROS trigger ZBP1 activation by inducing its aggregation independently of Z-nucleic acid sensing, leading to RIPK1 kinase activation and downstream apoptosis and inflammation.\",\n      \"method\": \"ZBP1 KO mouse steatotic liver I/R model, JNK inhibition, RIPK1 kinase inhibitor, ZBP1 aggregation assays, ROS measurement\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ZBP1 KO with defined mechanistic pathway, biochemical aggregation assays; single lab\",\n      \"pmids\": [\"38743492\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"TRIM32 is an E3 ubiquitin ligase that targets ZBP1 for proteasomal degradation; the cold-inducible RNA-binding protein CIRP competes with TRIM32 for ZBP1 binding (stabilizing ZBP1) when internalized into pulmonary endothelial cells via TLR4-mediated endocytosis during sepsis, thereby enhancing ZBP1-RIPK3-dependent PANoptosis.\",\n      \"method\": \"IP/MS identification of TRIM32, co-immunoprecipitation of CIRP-ZBP1 and TRIM32-ZBP1, ZBP1 ubiquitination/degradation assays, Zbp1−/− mouse sepsis model\",\n      \"journal\": \"Military Medical Research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — IP/MS plus Co-IP of competing interactions, ubiquitination biochemistry, ZBP1 KO mouse model; single lab\",\n      \"pmids\": [\"39465383\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Human ZBP1 (hZBP1) overexpression does not affect IFN-β or IL-8 production induced by intracellular bacteria or cytosolic poly(dA-dT) in human A549 cells, and multiple hZBP1 siRNAs do not suppress IFN-β responses in human cells, indicating that human ZBP1 is not required for cytosolic DNA-induced IFN-β responses in human cells (NEGATIVE FINDING for the sensor function in human cells).\",\n      \"method\": \"hZBP1 siRNA knockdown in human cells, hZBP1 overexpression, IFN-β reporter and ELISA assays, comparison with mouse L929 cells\",\n      \"journal\": \"Cellular microbiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple siRNA constructs, overexpression controls, human vs mouse cell comparison; negative result replicated with multiple approaches\",\n      \"pmids\": [\"18771559\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ZBP1 is an interferon-inducible innate immune sensor that detects Z-form DNA and Z-RNA (including viral Z-RNAs generated during IAV/HSV/VACV infection and endogenous Z-RNAs from retroelements) via its Zα1/Zα2 domains, and signals through two RHIM domains to recruit and activate RIPK3 (and, in some contexts, RIPK1) to drive PANoptosis—comprising necroptosis (via RIPK3-MLKL), apoptosis (via caspase-8), and pyroptosis (via NLRP3 inflammasome)—as well as NF-κB- and IRF3-dependent inflammation; this activity is negatively regulated by RIPK1's own RHIM (which competes with ZBP1 for RIPK3), by ADAR1 (which edits endogenous dsRNA to prevent Z-RNA formation and directly interacts with ZBP1's Zα2 domain), and by a short ZBP1 isoform that lacks RHIMs and competes for Z-nucleic acid binding, while ZBP1 also senses mitochondrial Z-DNA to cooperate with cGAS and activate MAVS on mitochondria and sustains type I IFN signaling via a ZBP1-cGAS-RIPK complex.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"ZBP1 (DAI/DLM-1) is an interferon-inducible innate immune sensor that detects Z-form nucleic acids through its N-terminal Zα domains and converts this recognition into RHIM-dependent activation of cell death and inflammatory signaling [#0, #1, #8]. Structural work defined the Zα winged-helix fold that recognizes left-handed Z-DNA via a structure-specific core shared with ADAR1 [#1], and ZBP1 binds both Z-DNA and Z-RNA, with Zα1/Zα2 mutations abolishing ligand engagement and downstream cell death [#8, #11]. Ligand binding drives ZBP1 oligomerization—self-association via its N-terminal/Zαβ region and condensate/amyloid-like assembly—as the activating step [#2, #10, #30]. Activated ZBP1 uses its two RHIM domains to recruit RIPK3 and RIPK1, nucleating signaling that drives PANoptosis: RIPK3-MLKL necroptosis, RIPK1-caspase-8 apoptosis, and inflammasome-linked pyroptosis, alongside NF-κB- and IRF3-dependent inflammation [#3, #5, #13, #27]. This pathway senses viral Z-RNAs during IAV, MCMV, HSV-1, and vaccinia infection [#4, #5, #11, #20], and the relevant ligands include host cell-encoded Z-RNAs from endogenous retroelements in aberrant transcripts generated when viruses disrupt transcription termination [#31]; influenza-induced nuclear Z-RNA can drive 'inside-out' nuclear necroptosis with nuclear-envelope disruption [#14]. ZBP1 signaling is restrained at multiple levels: RIPK1's RHIM and death domain compete for RIPK3 to prevent constitutive activation [#6, #7, #29], ADAR1 edits endogenous dsRNA and directly binds the Zα2 domain to block ZBP1-RIPK3 engagement [#16, #18], caspase-8/FADD suppress spontaneous ZBP1 expression [#24], and a short RHIM-lacking isoform competes for Z-nucleic acid binding [#32]. Beyond infection, ZBP1 senses Z-form mitochondrial DNA to nucleate a cGAS-RIPK1-RIPK3 complex that sustains type I IFN signaling and contributes to doxorubicin cardiotoxicity, and a crisis-associated isoform binds TERRA to activate MAVS on mitochondria [#25, #26]. Separately, the same gene product functions as zipcode-binding protein 1 in β-actin mRNA localization, where its KH3-KH4 di-domain recognizes the actin zipcode to control cell polarity and motility [#33, #34]. Human ZBP1 is not required for cytosolic DNA-induced IFN-β responses in human cells, distinguishing it from the mouse DNA-sensor role [#39].\",\n  \"teleology\": [\n    {\n      \"year\": 2001,\n      \"claim\": \"Established the structural basis of Z-nucleic acid recognition, defining the Zα domain fold that would later explain ZBP1 ligand specificity.\",\n      \"evidence\": \"X-ray crystallography of the DLM-1/ZBP1 Zα domain bound to Z-DNA\",\n      \"pmids\": [\"11524677\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not address full-length protein assembly\", \"No downstream signaling function defined at this stage\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Identified ZBP1 as a cytosolic DNA sensor that activates type I IFN, answering what links cytosolic DNA to the IRF3-TBK1 axis.\",\n      \"evidence\": \"siRNA knockdown, Co-IP, and reporter assays in mouse fibroblasts\",\n      \"pmids\": [\"17618271\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve whether B-DNA or Z-DNA is the physiological ligand\", \"Did not establish redundancy with other DNA sensors\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Defined a distinct mRNA-localization function of the same gene product (zipcode-binding protein 1) in controlling β-actin mRNA targeting and cell motility.\",\n      \"evidence\": \"Overexpression, mRNA localization imaging, chemotaxis and in vivo tumor imaging in metastatic cells\",\n      \"pmids\": [\"17878234\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Relationship between RNA-localization and immune-sensor functions unresolved\", \"Single-cell-type system\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Showed that dimerization is the key activation step and that multiple DNA-binding domains are required, framing oligomerization as the trigger for signaling.\",\n      \"evidence\": \"Domain mutagenesis and forced-dimerization constructs with reporter assays\",\n      \"pmids\": [\"18375758\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define the physiological dimerization trigger\", \"Mechanism of RHIM engagement not yet shown\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Tested whether the DNA-sensor role generalizes to human cells and found it does not, revealing a species-specific limitation of the IFN-sensor function.\",\n      \"evidence\": \"siRNA knockdown and overexpression with IFN-β readouts in human A549 cells vs mouse cells\",\n      \"pmids\": [\"18771559\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Negative result does not exclude other human ZBP1 functions\", \"Did not assess Z-RNA or cell-death roles in human cells\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Connected ZBP1 to RHIM-dependent kinase recruitment, showing it relays signals to RIPK1/RIPK3 and is targeted by viral RHIM mimics.\",\n      \"evidence\": \"Co-IP, siRNA knockdown of RIPK1/RIPK3, NF-κB reporter assays, MCMV M45 analysis\",\n      \"pmids\": [\"19590578\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cell-death versus NF-κB branching not resolved\", \"Did not establish in vivo relevance\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Demonstrated that ZBP1-RIPK3 complexes drive virus-induced programmed necrosis in vivo, establishing the necroptotic arm of ZBP1 signaling.\",\n      \"evidence\": \"Co-IP, Zbp1−/− mouse genetics, MCMV pathogenesis and viral vIRA evasion\",\n      \"pmids\": [\"22423968\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not identify the activating viral ligand\", \"MLKL involvement not yet shown\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Extended ZBP1 sensing to RNA viruses, showing IAV vRNP detection drives RIPK3-mediated necroptosis and apoptosis.\",\n      \"evidence\": \"Zbp1 KO/KD cells and mice, RIPK3 Co-IP, cell death assays\",\n      \"pmids\": [\"27746097\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define the Z-RNA nature of the ligand\", \"Upstream priming requirements unclear\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Revealed RIPK1's RHIM as a brake on ZBP1, explaining how ZBP1-RIPK3 necroptosis is held in check during development.\",\n      \"evidence\": \"Ripk1 RHIM knock-in mice, Co-IP of ZBP1-RIPK3, Zbp1−/− rescue, pRIPK3 blots\",\n      \"pmids\": [\"27819681\", \"27819682\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define the endogenous activating ligand in this setting\", \"Mechanism of RHIM competition at structural level unresolved\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Identified Z-RNA as the activating ligand by showing Zα mutations abolish necroptosis and that viral transcription, not DNA replication, is required.\",\n      \"evidence\": \"Zα domain knock-in mutants, MCMV infection assays, RNA cross-linking, viral mutants\",\n      \"pmids\": [\"28716805\", \"28607035\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Precise Z-RNA species not mapped\", \"Did not address host versus viral RNA origin\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Clarified ZBP1 domain architecture for activation and upstream priming, mapping self-interaction to the N-terminus and showing RIG-I-MAVS-IFN dependence and ZBP1 ubiquitination.\",\n      \"evidence\": \"Domain deletion Co-IP, RIG-I/MAVS KO cells, ubiquitination and vRNP pulldown assays\",\n      \"pmids\": [\"31076724\", \"28634194\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Ubiquitin ligase not identified at this stage\", \"Single-lab studies\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Showed ZBP1-RIPK3 can act independently of RIPK1 downstream of IFN and can restrict viruses via immunometabolism rather than death, broadening outcome diversity.\",\n      \"evidence\": \"Zbp1−/− in Ripk1−/− background, JAK/STAT inhibition; ZIKV neuron model with metabolomics and IRG1/itaconate analysis\",\n      \"pmids\": [\"31358656\", \"30635240\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Determinants selecting death versus metabolic restriction unclear\", \"Cell-type specificity of outcomes not resolved\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Demonstrated nuclear ZBP1 signaling and sterile activation by endogenous Z-nucleic acids, establishing ZBP1 as a sensor of self retroelement-derived dsRNA.\",\n      \"evidence\": \"IAV Z-RNA detection, nuclear RIPK3/MLKL imaging, multiple Ripk1/FADD mutant mice with Zbp1−/− rescue, nuclear export inhibition, RNA cross-linking\",\n      \"pmids\": [\"32200799\", \"32296175\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of specific endogenous retroelement transcripts incomplete\", \"Trigger that overcomes normal suppression in disease not fully defined\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Established ADAR1 as a direct negative regulator binding the Zα2 domain to block ZBP1-RIPK3 engagement and PANoptosis.\",\n      \"evidence\": \"ADAR1-ZBP1 Co-IP, Zα2 deletion knock-in mice, conditional ADAR1 KO, tumor and PANoptosis assays\",\n      \"pmids\": [\"34686350\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether suppression is purely editing-dependent or also via direct binding not fully separated\", \"Structural basis of ADAR1-Zα2 contact unresolved\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Placed ZBP1 within larger inflammatory-death complexes and TRIF/RIPK1 pathways, showing constitutive RIPK1 binding and incorporation into AIM2-containing PANoptosomes.\",\n      \"evidence\": \"ZBP1-RIPK1 Co-IP and KO in LPS/Yersinia models; multi-protein PANoptosome Co-IP with AIM2/pyrin KO in HSV-1/F. novicida infection\",\n      \"pmids\": [\"33397971\", \"34471287\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Stoichiometry and assembly order of the PANoptosome unresolved\", \"Whether ZBP1-RIPK1 binding is ligand-dependent unclear\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Defined viral evasion by Zα competition, showing vaccinia E3 sequesters Z-RNA via its own Zα domain to block ZBP1 necroptosis.\",\n      \"evidence\": \"E3 Zα mutant VACV, Z-RNA detection, ZBP1/RIPK3/MLKL KO cells, Zα domain swaps\",\n      \"pmids\": [\"34192517\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Quantitative ligand competition not measured\", \"Generalizability across poxviruses untested\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Confirmed and extended the ADAR1-ZBP1 axis, showing Alu-derived Z-RNA accumulation upon loss of ADAR1's Zα domain drives ZBP1-dependent death, fully rescued by ZBP1 ablation.\",\n      \"evidence\": \"Adar1 Zα-mutant and KO mice with Zbp1−/− rescue, cell death readouts, Alu RNA-seq; CBL0137 Z-DNA induction in fibroblasts\",\n      \"pmids\": [\"35859175\", \"35859177\", \"35859176\", \"35614224\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Therapeutic window of pharmacologic ZBP1 activation undefined\", \"Tissue-specific contributions of editing loss incomplete\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Defined cell-death-independent inflammatory signaling, showing ZBP1 scaffolds RIPK1/RIPK3-dependent ubiquitination and TLR3/4 inflammatory amplification.\",\n      \"evidence\": \"Co-IP of ZBP1-RIPK1-RIPK3-cIAP1-LUBAC, ubiquitin pulldowns, kinase-dead mutants in human cells; ZBP1-RIPK1-TRIF Co-IP and LPS sepsis mouse model\",\n      \"pmids\": [\"36268590\", \"35666872\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Relative contribution of scaffolding versus death signaling in vivo unclear\", \"Single-lab human/mouse systems\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Showed caspase-8/FADD suppress spontaneous ZBP1 expression via a cGAS-STING-TBK1 feedback loop, defining a transcriptional brake on sterile ZBP1 necroptosis.\",\n      \"evidence\": \"Casp8−/− and FADD−/− mice with Zbp1−/− rescue, FLAG-MLKL knock-in reporter, cGAS/STING/TBK1 inhibition\",\n      \"pmids\": [\"36191211\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct transcriptional regulators of Zbp1 not mapped\", \"Ligand driving spontaneous activation undefined\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Extended ZBP1 sensing to mitochondrial Z-DNA and TERRA, revealing it nucleates cGAS-RIPK or MAVS complexes to sustain IFN and drive crisis or cardiotoxicity.\",\n      \"evidence\": \"ZBP1 KO mice, Z-DNA detection, ZBP1-cGAS-RIPK Co-IP, STAT1 phosphorylation, doxorubicin model; crisis isoform TERRA binding, mitochondrial imaging, MAVS Co-IP, oligomerization assays\",\n      \"pmids\": [\"37352855\", \"36755096\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How Z-DNA stabilization on mtDNA is regulated unclear\", \"Isoform-specific localization determinants incomplete\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Resolved the molecular basis of RIPK1's restraint and the biophysics of ZBP1 assembly, defining RHIM amyloid cross-polymerization and condensate formation as activation steps.\",\n      \"evidence\": \"Ripk1 R588E DD knock-in mice; DLS/SAXS, in vitro condensate and amyloid assays, RHIM mutagenesis with necroptosis readout\",\n      \"pmids\": [\"38744293\", \"38982083\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"High-resolution structure of the activated ZBP1-RIPK3 fibril lacking\", \"In vivo relevance of phase separation untested\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Dissected ZBP1-driven inflammatory disease, showing it executes both necroptosis and kinase-independent RIPK1-caspase-8 apoptosis, with STING upregulating ZBP1 and forming a FADD-independent ZBP1-RIPK1-RIPK3 complex in dermatitis.\",\n      \"evidence\": \"ZBP1ca transgenic and Casp8E-KO mice with MLKL/caspase-8/STING/RIPK3 deletions, Co-IP, SAVI model rescue, RIPK1 kinase-dead knock-in\",\n      \"pmids\": [\"38849574\", \"40834903\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Endogenous triggers in human SAVI not fully defined\", \"Balance between necroptotic and apoptotic arms across tissues unresolved\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Identified endogenous regulators of ZBP1: a short RHIM-lacking isoform that competes for Z-RNA, and ligand-independent activation via aggregation and degradation control.\",\n      \"evidence\": \"ZBP1-S knock-in and KO mice, isoform combination death assays; steatotic liver I/R model with ZBP1 aggregation; TRIM32/CIRP ubiquitination and Co-IP in sepsis\",\n      \"pmids\": [\"39300211\", \"38743492\", \"39465383\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Regulation of isoform splicing ratio in disease unclear\", \"Whether ROS-induced aggregation uses the same RHIM interface as Z-nucleic acid sensing unresolved\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Pinpointed host-encoded retroelement Z-RNAs—generated by virus-driven disruption of transcription termination—as the major sufficient ZBP1 ligands during HSV-1 and IAV infection.\",\n      \"evidence\": \"Z-RNA sequencing, ICP27/NS1 viral mutants and ectopic expression, CPSF blockade, ZBP1 KO controls\",\n      \"pmids\": [\"41082924\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether all ZBP1-activating contexts share this host-RNA origin unknown\", \"Structural definition of these Z-RNAs at the Zα interface lacking\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the diverse ZBP1 ligands (viral and host Z-RNA, mitochondrial Z-DNA, TERRA, stress-induced aggregation) are integrated to select between necroptosis, apoptosis, pyroptosis, metabolic restriction, and IFN output remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unifying structural model of activated ZBP1 signaling complexes\", \"Determinants of outcome selection across cell types undefined\", \"Human-specific ZBP1 functions versus mouse remain incompletely mapped\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [8, 14, 26, 31, 33]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [0, 1, 2, 25]},\n      {\"term_id\": \"GO:0140299\", \"supporting_discovery_ids\": [0, 8, 25]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [3, 5, 4]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [3, 23, 33]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0, 3, 25]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [14, 15]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [25, 26]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [4, 5, 13, 14, 27]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [0, 3, 17, 22, 25]},\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [33, 34]}\n    ],\n    \"complexes\": [\"ZBP1-RIPK3 necroptosome\", \"AIM2-ZBP1 PANoptosome\", \"ZBP1-cGAS-RIPK1-RIPK3 mitochondrial complex\", \"TRIFosome (FADD-RIPK1-caspase-8)\"],\n    \"partners\": [\"RIPK3\", \"RIPK1\", \"ADAR1\", \"cGAS\", \"AIM2\", \"MAVS\", \"TRIM32\", \"CIRP\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":9,"faith_total":9,"faith_pct":100.0}}