{"gene":"NFKBIZ","run_date":"2026-04-29T11:37:56","timeline":{"discoveries":[{"year":2000,"finding":"NFKBIZ (MAIL) protein localizes to the nucleus and potentiates LPS-induced IL-6 production when ectopically expressed in Swiss 3T3 cells, identifying it as a nuclear IκB family member that activates inflammatory cytokine expression.","method":"Ectopic expression with nuclear localization determination; cytokine mRNA and secretion assays","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 3 — single lab, single overexpression experiment with functional readout but no mechanistic dissection of binding or catalytic domain","pmids":["11086164"],"is_preprint":false},{"year":2001,"finding":"The mouse Mail gene consists of 14 exons spanning ~30 kb, encodes a single-copy gene with NF-κB and NF-IL6 binding sites in its proximal promoter, maps to chromosome 16C1.2-C1.3 in mouse, and its promoter region drives high-level reporter gene expression in LPS-stimulated cells.","method":"Genomic cloning, Southern hybridization, FISH, primer extension, promoter-reporter assay","journal":"Immunogenetics","confidence":"Medium","confidence_rationale":"Tier 2 — multiple orthogonal methods (genomic mapping, FISH, promoter-luciferase) in single lab","pmids":["11797098"],"is_preprint":false},{"year":2002,"finding":"LPS-induced MAIL mRNA expression is mediated through Toll-like receptor 4 (TLR4), as demonstrated by TLR4 neutralizing antibody attenuation in U937 cells and reduced in vivo MAIL induction in TLR4-missense-mutant mice.","method":"Neutralizing antibody treatment; TLR4 expression correlation; in vivo mouse model with TLR4 mutation","journal":"The Journal of veterinary medical science","confidence":"Medium","confidence_rationale":"Tier 2 — multiple experimental approaches (antibody blockade + genetic mouse model) in single lab","pmids":["12069074"],"is_preprint":false},{"year":2003,"finding":"LPS induces MAIL expression predominantly in B-lymphocytes and macrophages (but not T-lymphocytes) in vivo and in vitro; the major expressed isoform is the long splicing variant MAIL-L; MAIL is also induced by IL-1, IL-6, and TNF.","method":"In situ hybridization, immunohistochemistry, Northern blot, Western blot in LPS-injected mice and cultured cells","journal":"Archives of histology and cytology","confidence":"Medium","confidence_rationale":"Tier 2 — multiple orthogonal methods (ISH, IHC, Northern, Western) confirming cell-type specificity","pmids":["12703554"],"is_preprint":false},{"year":2004,"finding":"Targeted disruption of the Mail gene in mice leads to atopic dermatitis-like skin lesions with elevated serum IgE, inflammatory cell infiltration, and markedly elevated chemokines (e.g., TARC) in skin; MAIL protein is constitutively expressed in keratinocytes, establishing its essential role in homeostatic regulation of skin immunity.","method":"Gene knockout mouse model; histopathology; serum IgE measurement; mRNA expression analysis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — clean KO mouse with specific, well-characterized dermatitis phenotype; replicated in subsequent studies","pmids":["15491998"],"is_preprint":false},{"year":2004,"finding":"MAIL gene expression in macrophages is strongly upregulated by NF-κB binding to a site at −229 to −220 bp in the promoter; MAIL autoregulates its own expression by suppressing LPS-induced MAIL promoter activity when overexpressed.","method":"Promoter deletion, point mutation, EMSA/binding analysis, overexpression reporter assay in RAW264 cells","journal":"Gene","confidence":"High","confidence_rationale":"Tier 1 — promoter mutagenesis combined with binding analysis and functional reporter assays establishing NF-κB site and autoregulatory mechanism","pmids":["15527973"],"is_preprint":false},{"year":2007,"finding":"Constitutive MAIL expression in epidermal keratinocytes is controlled by NF-κB, as demonstrated by downregulation with NF-κB inhibitor Bay11-7082 and the IκBαM supersuppressor; NF-κB subunits localize to both cytoplasm and nucleus in unstimulated keratinocytes, and LPS does not induce MAIL in keratinocytes (unlike IL-1).","method":"Pharmacological NF-κB inhibition, dominant-negative IκBαM overexpression, immunolocalization","journal":"The Journal of veterinary medical science","confidence":"Medium","confidence_rationale":"Tier 2 — two orthogonal inhibition approaches (pharmacological + dominant-negative) with consistent results in single lab","pmids":["17409644"],"is_preprint":false},{"year":2008,"finding":"The FUS-DDIT3 fusion oncoprotein in myxoid liposarcoma binds the C-terminal domain of NFKBIZ via co-immunoprecipitation; FUS-DDIT3 and NFKBIZ colocalize in nuclear structures; FUS-DDIT3 deregulates NF-κB target genes (including IL8) through interaction with NFKBIZ.","method":"Co-immunoprecipitation, colocalization (immunofluorescence), chromatin immunoprecipitation, IL8 promoter reporter assays","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 1-2 — reciprocal co-IP, ChIP, and functional promoter assay in single study with multiple orthogonal methods","pmids":["18850010"],"is_preprint":false},{"year":2009,"finding":"Human NFKBIZ (MAIL-L, 80 kDa isoform) localizes to the nucleus in monocytes, binds the NF-κB p50 subunit, and increases IL-6 promoter activity in a C/EBPβ-, NF-κB-, and AP-1-dependent manner; MAIL siRNA knockdown reduces IL-6 production in THP-1 cells and primary monocytes; MAIL expression is suppressed during monocyte-to-macrophage differentiation, correlating with reduced IL-6 output.","method":"Subcellular fractionation, Co-IP (MAIL-L/p50), luciferase promoter assay, siRNA knockdown, ELISA for IL-6","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 1-2 — multiple orthogonal methods: Co-IP, reporter assay, siRNA in both cell line and primary cells","pmids":["19783680"],"is_preprint":false},{"year":2012,"finding":"NF-κB binds to the miR-376b gene promoter upon LPS treatment; miR-376b directly targets and suppresses NFKBIZ (verified by luciferase reporter assay), forming a negative feedback loop: NF-κB activation → miR-376b induction → NFKBIZ suppression → modulation of renal tubular inflammation.","method":"ChIP assay, luciferase miRNA target reporter assay, miRNA mimic/inhibitor in vivo and in vitro","journal":"JCI insight","confidence":"High","confidence_rationale":"Tier 1-2 — ChIP + validated 3′UTR luciferase reporter + in vivo mimic/inhibitor experiments establishing direct regulatory axis","pmids":["33328388"],"is_preprint":false},{"year":2015,"finding":"IFN-γ induces Nfkbiz expression in keratinocytes through an interferon-stimulated response element (ISRE) in the Nfkbiz promoter; JAK1 and NF-κB are required for IFN-γ-induced Nfkbiz expression; IFN-γ and IL-1 synergize in inducing Nfkbiz expression.","method":"Promoter analysis (ISRE deletion), selective kinase/signaling inhibitors, gene expression assays","journal":"Biomedical research","confidence":"Medium","confidence_rationale":"Tier 2 — promoter deletion with inhibitor validation in single lab","pmids":["25876660"],"is_preprint":false},{"year":2015,"finding":"Nfkbiz-deficient keratinocytes are hypoproliferative and show reduced expression of differentiation markers K10 and filaggrin (but not K14), without altered NF-κB subcellular localization or transcriptional activity, indicating Nfkbiz controls keratinocyte proliferation and differentiation through NF-κB-independent mechanisms.","method":"KO mouse keratinocyte analysis, Ki-67 immunohistochemistry, differentiation marker expression, TUNEL assay, NF-κB activity assay","journal":"The Japanese journal of veterinary research","confidence":"Medium","confidence_rationale":"Tier 2 — KO phenotype characterized with multiple cellular markers and NF-κB activity control in single lab","pmids":["26563030"],"is_preprint":false},{"year":2017,"finding":"Nfkbiz-deficient (Nfkbiz−/−) mice develop spontaneous dermatitis accompanied by expanded IFN-γ−, IL-17A−, and IL-22-secreting CD4+ T cells and IL-17A-secreting γδ+ T cells, with marked skin dysbiosis dominated by Staphylococcus xylosus; antibiotic treatment ameliorates skin inflammation and topical S. xylosus application exacerbates it in Nfkbiz−/− mice, establishing a role for Nfkbiz in the microbiota-skin immunity axis.","method":"KO mouse model, flow cytometry, pyrosequencing of skin microbiome, antibiotic treatment, topical bacterial challenge","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 2 — KO model with immune profiling, microbiome analysis, and rescue/challenge experiments; multiple orthogonal methods","pmids":["28740238"],"is_preprint":false},{"year":2020,"finding":"In human synovial fibroblasts, IL-17A in combination with TNF selectively induces NFKBIZ expression in a dose-dependent manner; IκBζ (encoded by NFKBIZ) mediates transcriptional response to TNF+IL-17A but not TNF alone; IκBζ and CUX1 cooperate with NF-κB p65 to drive transcription of CXCL1, CXCL2, and CXCL3 through a putative CUX1-NF-κB composite promoter motif, independent of LIFR, STAT3, STAT4, and ELF3.","method":"siRNA gene silencing with RNA-seq, dose-response experiments, promoter motif analysis, genetic epistasis by sequential knockdown","journal":"PNAS","confidence":"High","confidence_rationale":"Tier 2 — time-series, dose-response, and gene-silencing transcriptomics with multiple targets, plus pathway epistasis","pmids":["32079724"],"is_preprint":false},{"year":2021,"finding":"In septic AKI and endotoxemia animal models, Nfkbiz mRNA is rapidly induced then declines, but IkBζ protein remains highly elevated specifically in cecal ligation/puncture (CLP) sepsis (but not LPS alone), indicating a CLP-specific mechanism extending IkBζ protein half-life; pharmacological IkBζ inhibition reduces Lcn2 expression, establishing IkBζ as a direct transcriptional inducer of Lcn2 in sepsis.","method":"CLP and LPS animal models, IkBζ inhibitor treatment, mRNA and protein expression time-course","journal":"Infection and immunity","confidence":"Medium","confidence_rationale":"Tier 2 — in vivo model with pharmacological inhibition and protein stability analysis in single lab","pmids":["33431705"],"is_preprint":false},{"year":2022,"finding":"NFKBIZ promoter activation is cooperatively driven by STAT3 and C/EBPβ through adjacent binding sites; STAT1 suppresses both C/EBPβ- and STAT3-driven NFKBIZ promoter activation independently of STAT1 tyrosine 701 phosphorylation; C/EBPβ knockdown attenuates IL-17A-induced NFKBIZ upregulation in HaCaT keratinocytes.","method":"siRNA knockdown, luciferase promoter assay with site deletions, Co-overexpression of transcription factors, STAT1 phospho-mutant","journal":"Biochemical and biophysical research communications","confidence":"High","confidence_rationale":"Tier 1-2 — promoter deletion/mutation analysis combined with siRNA and dominant-negative approaches, multiple transcription factor effects validated","pmids":["35537286"],"is_preprint":false},{"year":2024,"finding":"mRNA decay factors Regnase-1 (ZC3H12A) and Regnase-3 (ZC3H12C) post-transcriptionally destabilize Nfkbiz mRNA in hematopoietic stem and progenitor cells (HSPCs); loss of Reg1 and Reg3 causes Nfkbiz accumulation, shifting HSPCs toward myeloid lineage and away from lymphoid fate; Nfkbiz controls epigenetic landscape (chromatin accessibility) on myeloid-related gene loci in early HSPCs; antisense oligonucleotide inhibition of Reg1/Reg3-mediated Nfkbiz degradation primes HSCs toward myeloid lineages.","method":"Conditional double KO mice, scRNA-seq, scATAC-seq, antisense oligonucleotide treatment, in vivo rescue experiments","journal":"Blood","confidence":"High","confidence_rationale":"Tier 1-2 — genetic KO with single-cell multiomics, ASO rescue, and in vivo functional validation; strong mechanistic evidence","pmids":["37922454"],"is_preprint":false},{"year":2024,"finding":"TRIM16 directly interacts with NFKBIZ (co-immunoprecipitation) and enhances NFKBIZ ubiquitination at K48, promoting its proteasomal degradation; TRIM16-mediated NFKBIZ degradation reduces NF-κB signaling activity, implicating TRIM16 as an E3 ubiquitin ligase that writes K48 ubiquitin marks on NFKBIZ to regulate HCC cell growth and sorafenib sensitivity.","method":"Co-immunoprecipitation, protein degradation assay, flow cytometry (apoptosis), Western blot, immunofluorescence","journal":"Cellular and molecular life sciences","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP and ubiquitination assay with functional consequence, single lab","pmids":["38581570"],"is_preprint":false},{"year":2025,"finding":"Regnase-1 degrades Nfkbiz mRNA in intestinal epithelial cells as its primary target; Regnase-1 deficiency in enterocytes enhances IL-17 signaling via Nfkbiz accumulation and promotes colon tumor growth dependent on gut microbes and IL-17; Nfkbiz knockout abrogates the tumor-promoting effect of Regnase-1 deletion, establishing Nfkbiz as the key downstream effector of Regnase-1 in intestinal epithelial cells.","method":"Conditional KO mouse models (Regnase-1 intestinal KO and Nfkbiz KO), transcriptome analysis, IL-17 antibody neutralization, antibiotic treatment, ERK phosphorylation assay","journal":"PNAS","confidence":"High","confidence_rationale":"Tier 2 — two complementary KO models with epistasis demonstrated; antibody and antibiotic rescue; multiple orthogonal functional assays","pmids":["40460118"],"is_preprint":false}],"current_model":"NFKBIZ (IκBζ) is a nuclear IκB family protein constitutively expressed and inducible by LPS/IL-1/TNF/IL-17A via NF-κB, STAT3, and C/EBPβ; it localizes to the nucleus, binds NF-κB p50, and acts as a transcriptional co-activator of inflammatory cytokines (IL-6, CXCL1-3); its mRNA is post-transcriptionally destabilized by Regnase-1/3, its protein is ubiquitinated at K48 by TRIM16 for proteasomal degradation, it is targeted by miR-376b in a NF-κB negative feedback loop, and it plays essential roles in skin immunity, keratinocyte homeostasis, hematopoietic lineage determination, and IL-17-driven intestinal inflammation."},"narrative":{"teleology":[{"year":2000,"claim":"The identification of NFKBIZ (MAIL) as a nuclear IκB family member that potentiates IL-6 production established the founding concept that an IκB protein could act as a transcriptional activator rather than a repressor of NF-κB signaling.","evidence":"Ectopic expression in Swiss 3T3 cells with nuclear localization and cytokine assays","pmids":["11086164"],"confidence":"Medium","gaps":["Single overexpression system without identification of direct binding partners","No loss-of-function data","Mechanism of nuclear co-activation uncharacterized"]},{"year":2002,"claim":"Demonstrating that LPS-induced MAIL expression requires TLR4 placed NFKBIZ within the innate immune signaling cascade and explained its cell-type-specific induction in B cells and macrophages but not T cells.","evidence":"TLR4 neutralizing antibody in U937 cells and TLR4-mutant mice; in situ hybridization of multiple immune tissues","pmids":["12069074","12703554"],"confidence":"Medium","gaps":["Downstream signaling intermediates between TLR4 and NFKBIZ promoter not mapped","T cell exclusion mechanism unknown"]},{"year":2004,"claim":"NF-κB was identified as the critical transcription factor driving NFKBIZ expression through a defined promoter site, and NFKBIZ was shown to autoregulate its own promoter, revealing the first negative feedback mechanism controlling its expression.","evidence":"Promoter deletion/point mutation, EMSA, and overexpression reporter assays in RAW264 macrophages","pmids":["15527973"],"confidence":"High","gaps":["Identity of NF-κB subunits mediating autorepression not determined","Chromatin context of autoregulation not addressed"]},{"year":2004,"claim":"Targeted deletion of Nfkbiz in mice revealed an essential in vivo role in skin immunity and keratinocyte homeostasis, with knockout animals developing spontaneous atopic dermatitis-like disease with elevated IgE and chemokine production.","evidence":"Gene knockout mouse model with histopathology, serum IgE, and mRNA analysis","pmids":["15491998"],"confidence":"High","gaps":["Whether the dermatitis is cell-intrinsic to keratinocytes or immune-cell-driven was unresolved","Molecular targets of IκBζ in keratinocytes not identified"]},{"year":2009,"claim":"The demonstration that IκBζ binds NF-κB p50 and activates the IL-6 promoter through C/EBPβ, NF-κB, and AP-1 sites—confirmed by siRNA knockdown in primary monocytes—established the molecular mechanism of its transcriptional co-activator function.","evidence":"Subcellular fractionation, co-immunoprecipitation of IκBζ/p50, luciferase promoter assays, siRNA in THP-1 and primary monocytes","pmids":["19783680"],"confidence":"High","gaps":["Whether IκBζ contacts DNA directly or only through p50 was unresolved","Structural basis of the IκBζ–p50 interaction unknown"]},{"year":2015,"claim":"IFN-γ was found to induce NFKBIZ through an ISRE element requiring JAK1 and NF-κB, broadening the upstream signals beyond TLR/IL-1/TNF and explaining cytokine synergy (IFN-γ + IL-1) in keratinocytes; meanwhile, Nfkbiz-deficient keratinocytes showed impaired proliferation and differentiation through NF-κB-independent mechanisms.","evidence":"ISRE promoter deletion with kinase inhibitors; KO keratinocyte analysis with Ki-67, K10/filaggrin markers, and NF-κB activity assays","pmids":["25876660","26563030"],"confidence":"Medium","gaps":["NF-κB-independent effector pathways in keratinocytes not identified","ISRE-binding factor identity not confirmed by ChIP"]},{"year":2017,"claim":"The skin dermatitis in Nfkbiz-knockout mice was shown to involve expanded IL-17A/IL-22-producing T cells and dysbiosis dominated by S. xylosus, with antibiotic rescue and bacterial challenge experiments establishing that IκBζ maintains the microbiota–skin immunity axis.","evidence":"KO mouse with flow cytometry, 16S pyrosequencing, antibiotic treatment, and topical bacterial challenge","pmids":["28740238"],"confidence":"High","gaps":["Whether IκBζ acts in keratinocytes or immune cells to control dysbiosis was not resolved","Antimicrobial peptide targets of IκBζ not identified"]},{"year":2020,"claim":"In synovial fibroblasts, IL-17A/TNF co-stimulation was shown to selectively induce IκBζ, which cooperates with CUX1 and NF-κB p65 to drive CXCL1–3 transcription through a composite promoter motif, distinguishing the IκBζ-dependent gene program from TNF-only responses.","evidence":"siRNA with RNA-seq, dose-response, and genetic epistasis by sequential knockdown in primary human synovial fibroblasts","pmids":["32079724"],"confidence":"High","gaps":["Direct IκBζ–CUX1 physical interaction not demonstrated","Whether IκBζ/CUX1 cooperation generalizes beyond synovial fibroblasts unknown"]},{"year":2022,"claim":"STAT3 and C/EBPβ were identified as cooperative activators of the NFKBIZ promoter while STAT1 acts as a suppressor independent of Y701 phosphorylation, resolving how IL-17 signaling drives NFKBIZ transcription and how IFN-γ downstream STAT1 opposes it.","evidence":"Promoter deletion/mutation, siRNA, co-overexpression, and STAT1 phospho-mutant in HaCaT keratinocytes","pmids":["35537286"],"confidence":"High","gaps":["In vivo validation of STAT1 repression of NFKBIZ not performed","Mechanism of phosphorylation-independent STAT1 repression unclear"]},{"year":2024,"claim":"Regnase-1 and Regnase-3 were established as post-transcriptional destabilizers of Nfkbiz mRNA in hematopoietic stem/progenitor cells; their loss causes Nfkbiz accumulation that remodels chromatin accessibility at myeloid loci and shifts lineage fate from lymphoid to myeloid, revealing IκBζ as a master epigenetic regulator of hematopoietic lineage commitment.","evidence":"Conditional double-KO mice with scRNA-seq, scATAC-seq, antisense oligonucleotide treatment, and in vivo rescue","pmids":["37922454"],"confidence":"High","gaps":["Mechanism by which IκBζ remodels chromatin accessibility (direct vs. indirect) not resolved","Whether IκBζ partners with specific chromatin remodelers in HSPCs is unknown"]},{"year":2024,"claim":"TRIM16 was identified as an E3 ubiquitin ligase that directly ubiquitinates IκBζ at K48 for proteasomal degradation, establishing the first defined mechanism for IκBζ protein turnover and linking it to NF-κB attenuation.","evidence":"Co-immunoprecipitation, ubiquitination assay, proteasomal degradation assay in HCC cells","pmids":["38581570"],"confidence":"Medium","gaps":["Specific lysine residue(s) on IκBζ modified by TRIM16 not mapped","Reciprocal IP and in vitro reconstitution not reported","Physiological relevance beyond HCC not demonstrated"]},{"year":2025,"claim":"Epistatic genetic experiments in intestinal epithelium demonstrated that Nfkbiz is the obligate downstream effector of Regnase-1-regulated IL-17 signaling that drives microbiota-dependent inflammation and colon tumorigenesis, as Nfkbiz knockout fully abrogated the tumor-promoting effect of Regnase-1 deletion.","evidence":"Conditional Regnase-1 intestinal KO crossed with Nfkbiz KO mice; IL-17 antibody neutralization; antibiotic treatment; transcriptome analysis","pmids":["40460118"],"confidence":"High","gaps":["Direct transcriptional targets of IκBζ in intestinal epithelium not comprehensively defined","Whether IκBζ-driven tumorigenesis operates through the same CUX1/p65 mechanism as in synovial fibroblasts is unknown"]},{"year":null,"claim":"The structural basis of IκBζ interaction with NF-κB subunits, the mechanism by which IκBζ remodels chromatin in hematopoietic progenitors, and the identity of IκBζ-specific target genes in keratinocytes that maintain barrier immunity remain unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No crystal/cryo-EM structure of IκBζ–p50 complex","Chromatin remodeler partners of IκBζ in HSPCs unidentified","Full IκBζ target gene repertoire in skin keratinocytes not defined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,8,13,14]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[8,13,16]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,7,8]}],"pathway":[{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[0,2,3,4,8,12,13,18]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[5,8,9,10,13,15,17]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[5,8,13,15,16]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[11,16]}],"complexes":[],"partners":["NFKB1","CUX1","CEBPB","TRIM16","ZC3H12A","ZC3H12C","FUS-DDIT3"],"other_free_text":[]},"mechanistic_narrative":"NFKBIZ encodes IκBζ, a nuclear IκB family member that functions as a transcriptional co-activator of NF-κB-dependent inflammatory gene expression, driving production of IL-6, CXCL1–3, Lcn2, and IL-8 by binding the NF-κB p50 subunit and cooperating with C/EBPβ, CUX1, and AP-1 at target promoters [PMID:19783680, PMID:32079724, PMID:33431705]. NFKBIZ transcription is induced by LPS (via TLR4), IL-1, TNF, IL-17A, and IFN-γ through NF-κB, STAT3/C/EBPβ, and ISRE elements in its promoter, with STAT1 serving as a negative regulator, and NFKBIZ autoregulates its own promoter activity [PMID:15527973, PMID:35537286, PMID:25876660]. Post-transcriptionally, Nfkbiz mRNA is destabilized by Regnase-1 and Regnase-3, and at the protein level IκBζ is targeted for K48-linked ubiquitination and proteasomal degradation by the E3 ligase TRIM16, while miR-376b directly suppresses NFKBIZ in an NF-κB negative-feedback circuit [PMID:37922454, PMID:38581570, PMID:33328388]. Functionally, Nfkbiz is essential for skin barrier homeostasis and microbiota-driven skin immunity—its knockout causes spontaneous atopic dermatitis with dysbiosis—and it controls hematopoietic lineage fate by remodeling chromatin accessibility at myeloid gene loci in stem/progenitor cells, while in intestinal epithelium it is the critical effector of Regnase-1-regulated IL-17 signaling that promotes inflammation-associated tumorigenesis [PMID:15491998, PMID:28740238, PMID:37922454, PMID:40460118]."},"prefetch_data":{"uniprot":{"accession":"Q9BYH8","full_name":"NF-kappa-B inhibitor zeta","aliases":["I-kappa-B-zeta","IkB-zeta","IkappaBzeta","IL-1 inducible nuclear ankyrin-repeat protein","INAP","Molecule possessing ankyrin repeats induced by lipopolysaccharide","MAIL"],"length_aa":718,"mass_kda":78.1,"function":"Involved in regulation of NF-kappa-B transcription factor complexes (PubMed:16513645, PubMed:16622025). Inhibits NF-kappa-B activity without affecting its nuclear translocation upon stimulation (PubMed:16513645). Inhibits DNA-binding of RELA and NFKB1/p50, and of the NF-kappa-B p65-p50 heterodimer and the NF-kappa-B p50-p50 homodimer (PubMed:16513645). Also seems to activate NF-kappa-B-mediated transcription (PubMed:16622025). In vitro, upon association with NFKB1/p50 has transcriptional activation activity and, together with NFKB1/p50 and RELA, is recruited to LCN2 promoters (PubMed:16622025). Promotes transcription of LCN2 and DEFB4 (PubMed:16622025). Is recruited to IL-6 promoters and activates IL-6 but decreases TNF production in response to LPS (By similarity). Seems to be involved in the induction of inflammatory genes activated through TLR/IL-1 receptor signaling (By similarity). Involved in the induction of T helper 17 cells (Th17) differentiation upon recognition of antigen by T cell antigen receptor (TCR) (By similarity)","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/Q9BYH8/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/NFKBIZ","classification":"Not Classified","n_dependent_lines":4,"n_total_lines":1208,"dependency_fraction":0.0033112582781456954},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/NFKBIZ","total_profiled":1310},"omim":[{"mim_id":"618887","title":"NUCLEAR FACTOR KAPPA-B INHIBITOR, DELTA; NFKBID","url":"https://www.omim.org/entry/618887"},{"mim_id":"614995","title":"INTERLEUKIN 17 RECEPTOR E; IL17RE","url":"https://www.omim.org/entry/614995"},{"mim_id":"612839","title":"TET METHYLCYTOSINE DIOXYGENASE 2; TET2","url":"https://www.omim.org/entry/612839"},{"mim_id":"608004","title":"NUCLEAR FACTOR KAPPA-B INHIBITOR, ZETA; NFKBIZ","url":"https://www.omim.org/entry/608004"},{"mim_id":"607043","title":"TRAF3-INTERACTING PROTEIN 2; TRAF3IP2","url":"https://www.omim.org/entry/607043"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nuclear speckles","reliability":"Supported"},{"location":"Cytoplasmic bodies","reliability":"Additional"}],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"bone marrow","ntpm":383.6}],"url":"https://www.proteinatlas.org/search/NFKBIZ"},"hgnc":{"alias_symbol":["MAIL","FLJ34463","INAP"],"prev_symbol":[]},"alphafold":{"accession":"Q9BYH8","domains":[{"cath_id":"1.25.40.20","chopping":"418-506","consensus_level":"medium","plddt":89.9092,"start":418,"end":506}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9BYH8","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9BYH8-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9BYH8-F1-predicted_aligned_error_v6.png","plddt_mean":57.69},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=NFKBIZ","jax_strain_url":"https://www.jax.org/strain/search?query=NFKBIZ"},"sequence":{"accession":"Q9BYH8","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9BYH8.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9BYH8/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9BYH8"}},"corpus_meta":[{"pmid":"8193956","id":"PMC_8193956","title":"PHD--an automatic mail server for protein secondary structure prediction.","date":"1994","source":"Computer applications in the biosciences : CABIOS","url":"https://pubmed.ncbi.nlm.nih.gov/8193956","citation_count":615,"is_preprint":false},{"pmid":"12645823","id":"PMC_12645823","title":"DNA from buccal swabs recruited by mail: evaluation of storage effects on long-term stability and suitability for multiplex polymerase chain reaction genotyping.","date":"2003","source":"Behavior genetics","url":"https://pubmed.ncbi.nlm.nih.gov/12645823","citation_count":275,"is_preprint":false},{"pmid":"9210796","id":"PMC_9210796","title":"DNA by mail: an inexpensive and noninvasive method for collecting DNA samples from widely dispersed populations.","date":"1997","source":"Behavior genetics","url":"https://pubmed.ncbi.nlm.nih.gov/9210796","citation_count":213,"is_preprint":false},{"pmid":"31853061","id":"PMC_31853061","title":"Frequent mutations that converge on the NFKBIZ pathway in ulcerative 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Nippon acta radiologica","url":"https://pubmed.ncbi.nlm.nih.gov/11857951","citation_count":3,"is_preprint":false},{"pmid":"39322062","id":"PMC_39322062","title":"Assessing the association between common functional Nuclear Factor Kappa-b gene polymorphisms (NFKB1, NFKBIZ, NFKBIA) and Alzheimer´s disease.","date":"2024","source":"Behavioural brain research","url":"https://pubmed.ncbi.nlm.nih.gov/39322062","citation_count":2,"is_preprint":false},{"pmid":"34890398","id":"PMC_34890398","title":"Diagnosis of Taenia solium infections based on \"mail order\" RNA-sequencing of single tapeworm egg isolates from stool samples.","date":"2021","source":"PLoS neglected tropical diseases","url":"https://pubmed.ncbi.nlm.nih.gov/34890398","citation_count":2,"is_preprint":false},{"pmid":"18404894","id":"PMC_18404894","title":"Cell phone e-mail as a means to collect information on pregnancy and delivery: a pilot study in Japan.","date":"2008","source":"Fukuoka igaku zasshi = Hukuoka acta medica","url":"https://pubmed.ncbi.nlm.nih.gov/18404894","citation_count":1,"is_preprint":false},{"pmid":"38143713","id":"PMC_38143713","title":"The Application of a Multi-Material Flexible Chain Mail for the Design of an Artificial Spinal Disc to Reproduce Natural Nonlinear and Anisotropic Rotational Behavior.","date":"2023","source":"3D printing and additive manufacturing","url":"https://pubmed.ncbi.nlm.nih.gov/38143713","citation_count":1,"is_preprint":false},{"pmid":"24325841","id":"PMC_24325841","title":"Optimizing recruitment to a prostate cancer surveillance program among male BRCA1 mutation carriers: invitation by mail or by telephone.","date":"2013","source":"Hereditary cancer in clinical practice","url":"https://pubmed.ncbi.nlm.nih.gov/24325841","citation_count":1,"is_preprint":false},{"pmid":"5907946","id":"PMC_5907946","title":"Mail-order chromosome analysis.","date":"1966","source":"Canadian Medical Association journal","url":"https://pubmed.ncbi.nlm.nih.gov/5907946","citation_count":1,"is_preprint":false},{"pmid":"40683182","id":"PMC_40683182","title":"Peer-delivered mail-order self-collection and linkage to treatment for hepatitis C virus infection among users of a harm reduction service in Denmark.","date":"2025","source":"The International journal on drug policy","url":"https://pubmed.ncbi.nlm.nih.gov/40683182","citation_count":1,"is_preprint":false},{"pmid":"12216702","id":"PMC_12216702","title":"Solicitation by e-mail and solicitor's status: a field study of social influence on the web.","date":"2002","source":"Cyberpsychology & behavior : the impact of the Internet, multimedia and virtual reality on behavior and society","url":"https://pubmed.ncbi.nlm.nih.gov/12216702","citation_count":1,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":46092,"output_tokens":4848,"usd":0.105498},"stage2":{"model":"claude-opus-4-6","input_tokens":8526,"output_tokens":3575,"usd":0.198008},"total_usd":0.303506,"stage1_batch_id":"msgbatch_012ZiiCUBfB62NCTQd4Bk1Jo","stage2_batch_id":"msgbatch_01Xuqq9aUHoQouS7UVGZNStZ","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2000,\n      \"finding\": \"NFKBIZ (MAIL) protein localizes to the nucleus and potentiates LPS-induced IL-6 production when ectopically expressed in Swiss 3T3 cells, identifying it as a nuclear IκB family member that activates inflammatory cytokine expression.\",\n      \"method\": \"Ectopic expression with nuclear localization determination; cytokine mRNA and secretion assays\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — single lab, single overexpression experiment with functional readout but no mechanistic dissection of binding or catalytic domain\",\n      \"pmids\": [\"11086164\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"The mouse Mail gene consists of 14 exons spanning ~30 kb, encodes a single-copy gene with NF-κB and NF-IL6 binding sites in its proximal promoter, maps to chromosome 16C1.2-C1.3 in mouse, and its promoter region drives high-level reporter gene expression in LPS-stimulated cells.\",\n      \"method\": \"Genomic cloning, Southern hybridization, FISH, primer extension, promoter-reporter assay\",\n      \"journal\": \"Immunogenetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (genomic mapping, FISH, promoter-luciferase) in single lab\",\n      \"pmids\": [\"11797098\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"LPS-induced MAIL mRNA expression is mediated through Toll-like receptor 4 (TLR4), as demonstrated by TLR4 neutralizing antibody attenuation in U937 cells and reduced in vivo MAIL induction in TLR4-missense-mutant mice.\",\n      \"method\": \"Neutralizing antibody treatment; TLR4 expression correlation; in vivo mouse model with TLR4 mutation\",\n      \"journal\": \"The Journal of veterinary medical science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple experimental approaches (antibody blockade + genetic mouse model) in single lab\",\n      \"pmids\": [\"12069074\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"LPS induces MAIL expression predominantly in B-lymphocytes and macrophages (but not T-lymphocytes) in vivo and in vitro; the major expressed isoform is the long splicing variant MAIL-L; MAIL is also induced by IL-1, IL-6, and TNF.\",\n      \"method\": \"In situ hybridization, immunohistochemistry, Northern blot, Western blot in LPS-injected mice and cultured cells\",\n      \"journal\": \"Archives of histology and cytology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (ISH, IHC, Northern, Western) confirming cell-type specificity\",\n      \"pmids\": [\"12703554\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Targeted disruption of the Mail gene in mice leads to atopic dermatitis-like skin lesions with elevated serum IgE, inflammatory cell infiltration, and markedly elevated chemokines (e.g., TARC) in skin; MAIL protein is constitutively expressed in keratinocytes, establishing its essential role in homeostatic regulation of skin immunity.\",\n      \"method\": \"Gene knockout mouse model; histopathology; serum IgE measurement; mRNA expression analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO mouse with specific, well-characterized dermatitis phenotype; replicated in subsequent studies\",\n      \"pmids\": [\"15491998\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"MAIL gene expression in macrophages is strongly upregulated by NF-κB binding to a site at −229 to −220 bp in the promoter; MAIL autoregulates its own expression by suppressing LPS-induced MAIL promoter activity when overexpressed.\",\n      \"method\": \"Promoter deletion, point mutation, EMSA/binding analysis, overexpression reporter assay in RAW264 cells\",\n      \"journal\": \"Gene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — promoter mutagenesis combined with binding analysis and functional reporter assays establishing NF-κB site and autoregulatory mechanism\",\n      \"pmids\": [\"15527973\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Constitutive MAIL expression in epidermal keratinocytes is controlled by NF-κB, as demonstrated by downregulation with NF-κB inhibitor Bay11-7082 and the IκBαM supersuppressor; NF-κB subunits localize to both cytoplasm and nucleus in unstimulated keratinocytes, and LPS does not induce MAIL in keratinocytes (unlike IL-1).\",\n      \"method\": \"Pharmacological NF-κB inhibition, dominant-negative IκBαM overexpression, immunolocalization\",\n      \"journal\": \"The Journal of veterinary medical science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — two orthogonal inhibition approaches (pharmacological + dominant-negative) with consistent results in single lab\",\n      \"pmids\": [\"17409644\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"The FUS-DDIT3 fusion oncoprotein in myxoid liposarcoma binds the C-terminal domain of NFKBIZ via co-immunoprecipitation; FUS-DDIT3 and NFKBIZ colocalize in nuclear structures; FUS-DDIT3 deregulates NF-κB target genes (including IL8) through interaction with NFKBIZ.\",\n      \"method\": \"Co-immunoprecipitation, colocalization (immunofluorescence), chromatin immunoprecipitation, IL8 promoter reporter assays\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — reciprocal co-IP, ChIP, and functional promoter assay in single study with multiple orthogonal methods\",\n      \"pmids\": [\"18850010\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Human NFKBIZ (MAIL-L, 80 kDa isoform) localizes to the nucleus in monocytes, binds the NF-κB p50 subunit, and increases IL-6 promoter activity in a C/EBPβ-, NF-κB-, and AP-1-dependent manner; MAIL siRNA knockdown reduces IL-6 production in THP-1 cells and primary monocytes; MAIL expression is suppressed during monocyte-to-macrophage differentiation, correlating with reduced IL-6 output.\",\n      \"method\": \"Subcellular fractionation, Co-IP (MAIL-L/p50), luciferase promoter assay, siRNA knockdown, ELISA for IL-6\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal methods: Co-IP, reporter assay, siRNA in both cell line and primary cells\",\n      \"pmids\": [\"19783680\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"NF-κB binds to the miR-376b gene promoter upon LPS treatment; miR-376b directly targets and suppresses NFKBIZ (verified by luciferase reporter assay), forming a negative feedback loop: NF-κB activation → miR-376b induction → NFKBIZ suppression → modulation of renal tubular inflammation.\",\n      \"method\": \"ChIP assay, luciferase miRNA target reporter assay, miRNA mimic/inhibitor in vivo and in vitro\",\n      \"journal\": \"JCI insight\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — ChIP + validated 3′UTR luciferase reporter + in vivo mimic/inhibitor experiments establishing direct regulatory axis\",\n      \"pmids\": [\"33328388\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"IFN-γ induces Nfkbiz expression in keratinocytes through an interferon-stimulated response element (ISRE) in the Nfkbiz promoter; JAK1 and NF-κB are required for IFN-γ-induced Nfkbiz expression; IFN-γ and IL-1 synergize in inducing Nfkbiz expression.\",\n      \"method\": \"Promoter analysis (ISRE deletion), selective kinase/signaling inhibitors, gene expression assays\",\n      \"journal\": \"Biomedical research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — promoter deletion with inhibitor validation in single lab\",\n      \"pmids\": [\"25876660\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Nfkbiz-deficient keratinocytes are hypoproliferative and show reduced expression of differentiation markers K10 and filaggrin (but not K14), without altered NF-κB subcellular localization or transcriptional activity, indicating Nfkbiz controls keratinocyte proliferation and differentiation through NF-κB-independent mechanisms.\",\n      \"method\": \"KO mouse keratinocyte analysis, Ki-67 immunohistochemistry, differentiation marker expression, TUNEL assay, NF-κB activity assay\",\n      \"journal\": \"The Japanese journal of veterinary research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KO phenotype characterized with multiple cellular markers and NF-κB activity control in single lab\",\n      \"pmids\": [\"26563030\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Nfkbiz-deficient (Nfkbiz−/−) mice develop spontaneous dermatitis accompanied by expanded IFN-γ−, IL-17A−, and IL-22-secreting CD4+ T cells and IL-17A-secreting γδ+ T cells, with marked skin dysbiosis dominated by Staphylococcus xylosus; antibiotic treatment ameliorates skin inflammation and topical S. xylosus application exacerbates it in Nfkbiz−/− mice, establishing a role for Nfkbiz in the microbiota-skin immunity axis.\",\n      \"method\": \"KO mouse model, flow cytometry, pyrosequencing of skin microbiome, antibiotic treatment, topical bacterial challenge\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — KO model with immune profiling, microbiome analysis, and rescue/challenge experiments; multiple orthogonal methods\",\n      \"pmids\": [\"28740238\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"In human synovial fibroblasts, IL-17A in combination with TNF selectively induces NFKBIZ expression in a dose-dependent manner; IκBζ (encoded by NFKBIZ) mediates transcriptional response to TNF+IL-17A but not TNF alone; IκBζ and CUX1 cooperate with NF-κB p65 to drive transcription of CXCL1, CXCL2, and CXCL3 through a putative CUX1-NF-κB composite promoter motif, independent of LIFR, STAT3, STAT4, and ELF3.\",\n      \"method\": \"siRNA gene silencing with RNA-seq, dose-response experiments, promoter motif analysis, genetic epistasis by sequential knockdown\",\n      \"journal\": \"PNAS\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — time-series, dose-response, and gene-silencing transcriptomics with multiple targets, plus pathway epistasis\",\n      \"pmids\": [\"32079724\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"In septic AKI and endotoxemia animal models, Nfkbiz mRNA is rapidly induced then declines, but IkBζ protein remains highly elevated specifically in cecal ligation/puncture (CLP) sepsis (but not LPS alone), indicating a CLP-specific mechanism extending IkBζ protein half-life; pharmacological IkBζ inhibition reduces Lcn2 expression, establishing IkBζ as a direct transcriptional inducer of Lcn2 in sepsis.\",\n      \"method\": \"CLP and LPS animal models, IkBζ inhibitor treatment, mRNA and protein expression time-course\",\n      \"journal\": \"Infection and immunity\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo model with pharmacological inhibition and protein stability analysis in single lab\",\n      \"pmids\": [\"33431705\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"NFKBIZ promoter activation is cooperatively driven by STAT3 and C/EBPβ through adjacent binding sites; STAT1 suppresses both C/EBPβ- and STAT3-driven NFKBIZ promoter activation independently of STAT1 tyrosine 701 phosphorylation; C/EBPβ knockdown attenuates IL-17A-induced NFKBIZ upregulation in HaCaT keratinocytes.\",\n      \"method\": \"siRNA knockdown, luciferase promoter assay with site deletions, Co-overexpression of transcription factors, STAT1 phospho-mutant\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — promoter deletion/mutation analysis combined with siRNA and dominant-negative approaches, multiple transcription factor effects validated\",\n      \"pmids\": [\"35537286\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"mRNA decay factors Regnase-1 (ZC3H12A) and Regnase-3 (ZC3H12C) post-transcriptionally destabilize Nfkbiz mRNA in hematopoietic stem and progenitor cells (HSPCs); loss of Reg1 and Reg3 causes Nfkbiz accumulation, shifting HSPCs toward myeloid lineage and away from lymphoid fate; Nfkbiz controls epigenetic landscape (chromatin accessibility) on myeloid-related gene loci in early HSPCs; antisense oligonucleotide inhibition of Reg1/Reg3-mediated Nfkbiz degradation primes HSCs toward myeloid lineages.\",\n      \"method\": \"Conditional double KO mice, scRNA-seq, scATAC-seq, antisense oligonucleotide treatment, in vivo rescue experiments\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — genetic KO with single-cell multiomics, ASO rescue, and in vivo functional validation; strong mechanistic evidence\",\n      \"pmids\": [\"37922454\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"TRIM16 directly interacts with NFKBIZ (co-immunoprecipitation) and enhances NFKBIZ ubiquitination at K48, promoting its proteasomal degradation; TRIM16-mediated NFKBIZ degradation reduces NF-κB signaling activity, implicating TRIM16 as an E3 ubiquitin ligase that writes K48 ubiquitin marks on NFKBIZ to regulate HCC cell growth and sorafenib sensitivity.\",\n      \"method\": \"Co-immunoprecipitation, protein degradation assay, flow cytometry (apoptosis), Western blot, immunofluorescence\",\n      \"journal\": \"Cellular and molecular life sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP and ubiquitination assay with functional consequence, single lab\",\n      \"pmids\": [\"38581570\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Regnase-1 degrades Nfkbiz mRNA in intestinal epithelial cells as its primary target; Regnase-1 deficiency in enterocytes enhances IL-17 signaling via Nfkbiz accumulation and promotes colon tumor growth dependent on gut microbes and IL-17; Nfkbiz knockout abrogates the tumor-promoting effect of Regnase-1 deletion, establishing Nfkbiz as the key downstream effector of Regnase-1 in intestinal epithelial cells.\",\n      \"method\": \"Conditional KO mouse models (Regnase-1 intestinal KO and Nfkbiz KO), transcriptome analysis, IL-17 antibody neutralization, antibiotic treatment, ERK phosphorylation assay\",\n      \"journal\": \"PNAS\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — two complementary KO models with epistasis demonstrated; antibody and antibiotic rescue; multiple orthogonal functional assays\",\n      \"pmids\": [\"40460118\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"NFKBIZ (IκBζ) is a nuclear IκB family protein constitutively expressed and inducible by LPS/IL-1/TNF/IL-17A via NF-κB, STAT3, and C/EBPβ; it localizes to the nucleus, binds NF-κB p50, and acts as a transcriptional co-activator of inflammatory cytokines (IL-6, CXCL1-3); its mRNA is post-transcriptionally destabilized by Regnase-1/3, its protein is ubiquitinated at K48 by TRIM16 for proteasomal degradation, it is targeted by miR-376b in a NF-κB negative feedback loop, and it plays essential roles in skin immunity, keratinocyte homeostasis, hematopoietic lineage determination, and IL-17-driven intestinal inflammation.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"NFKBIZ encodes IκBζ, a nuclear IκB family member that functions as a transcriptional co-activator of NF-κB-dependent inflammatory gene expression, driving production of IL-6, CXCL1–3, Lcn2, and IL-8 by binding the NF-κB p50 subunit and cooperating with C/EBPβ, CUX1, and AP-1 at target promoters [PMID:19783680, PMID:32079724, PMID:33431705]. NFKBIZ transcription is induced by LPS (via TLR4), IL-1, TNF, IL-17A, and IFN-γ through NF-κB, STAT3/C/EBPβ, and ISRE elements in its promoter, with STAT1 serving as a negative regulator, and NFKBIZ autoregulates its own promoter activity [PMID:15527973, PMID:35537286, PMID:25876660]. Post-transcriptionally, Nfkbiz mRNA is destabilized by Regnase-1 and Regnase-3, and at the protein level IκBζ is targeted for K48-linked ubiquitination and proteasomal degradation by the E3 ligase TRIM16, while miR-376b directly suppresses NFKBIZ in an NF-κB negative-feedback circuit [PMID:37922454, PMID:38581570, PMID:33328388]. Functionally, Nfkbiz is essential for skin barrier homeostasis and microbiota-driven skin immunity—its knockout causes spontaneous atopic dermatitis with dysbiosis—and it controls hematopoietic lineage fate by remodeling chromatin accessibility at myeloid gene loci in stem/progenitor cells, while in intestinal epithelium it is the critical effector of Regnase-1-regulated IL-17 signaling that promotes inflammation-associated tumorigenesis [PMID:15491998, PMID:28740238, PMID:37922454, PMID:40460118].\",\n  \"teleology\": [\n    {\n      \"year\": 2000,\n      \"claim\": \"The identification of NFKBIZ (MAIL) as a nuclear IκB family member that potentiates IL-6 production established the founding concept that an IκB protein could act as a transcriptional activator rather than a repressor of NF-κB signaling.\",\n      \"evidence\": \"Ectopic expression in Swiss 3T3 cells with nuclear localization and cytokine assays\",\n      \"pmids\": [\"11086164\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single overexpression system without identification of direct binding partners\", \"No loss-of-function data\", \"Mechanism of nuclear co-activation uncharacterized\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Demonstrating that LPS-induced MAIL expression requires TLR4 placed NFKBIZ within the innate immune signaling cascade and explained its cell-type-specific induction in B cells and macrophages but not T cells.\",\n      \"evidence\": \"TLR4 neutralizing antibody in U937 cells and TLR4-mutant mice; in situ hybridization of multiple immune tissues\",\n      \"pmids\": [\"12069074\", \"12703554\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Downstream signaling intermediates between TLR4 and NFKBIZ promoter not mapped\", \"T cell exclusion mechanism unknown\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"NF-κB was identified as the critical transcription factor driving NFKBIZ expression through a defined promoter site, and NFKBIZ was shown to autoregulate its own promoter, revealing the first negative feedback mechanism controlling its expression.\",\n      \"evidence\": \"Promoter deletion/point mutation, EMSA, and overexpression reporter assays in RAW264 macrophages\",\n      \"pmids\": [\"15527973\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of NF-κB subunits mediating autorepression not determined\", \"Chromatin context of autoregulation not addressed\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Targeted deletion of Nfkbiz in mice revealed an essential in vivo role in skin immunity and keratinocyte homeostasis, with knockout animals developing spontaneous atopic dermatitis-like disease with elevated IgE and chemokine production.\",\n      \"evidence\": \"Gene knockout mouse model with histopathology, serum IgE, and mRNA analysis\",\n      \"pmids\": [\"15491998\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether the dermatitis is cell-intrinsic to keratinocytes or immune-cell-driven was unresolved\", \"Molecular targets of IκBζ in keratinocytes not identified\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"The demonstration that IκBζ binds NF-κB p50 and activates the IL-6 promoter through C/EBPβ, NF-κB, and AP-1 sites—confirmed by siRNA knockdown in primary monocytes—established the molecular mechanism of its transcriptional co-activator function.\",\n      \"evidence\": \"Subcellular fractionation, co-immunoprecipitation of IκBζ/p50, luciferase promoter assays, siRNA in THP-1 and primary monocytes\",\n      \"pmids\": [\"19783680\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether IκBζ contacts DNA directly or only through p50 was unresolved\", \"Structural basis of the IκBζ–p50 interaction unknown\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"IFN-γ was found to induce NFKBIZ through an ISRE element requiring JAK1 and NF-κB, broadening the upstream signals beyond TLR/IL-1/TNF and explaining cytokine synergy (IFN-γ + IL-1) in keratinocytes; meanwhile, Nfkbiz-deficient keratinocytes showed impaired proliferation and differentiation through NF-κB-independent mechanisms.\",\n      \"evidence\": \"ISRE promoter deletion with kinase inhibitors; KO keratinocyte analysis with Ki-67, K10/filaggrin markers, and NF-κB activity assays\",\n      \"pmids\": [\"25876660\", \"26563030\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"NF-κB-independent effector pathways in keratinocytes not identified\", \"ISRE-binding factor identity not confirmed by ChIP\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"The skin dermatitis in Nfkbiz-knockout mice was shown to involve expanded IL-17A/IL-22-producing T cells and dysbiosis dominated by S. xylosus, with antibiotic rescue and bacterial challenge experiments establishing that IκBζ maintains the microbiota–skin immunity axis.\",\n      \"evidence\": \"KO mouse with flow cytometry, 16S pyrosequencing, antibiotic treatment, and topical bacterial challenge\",\n      \"pmids\": [\"28740238\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether IκBζ acts in keratinocytes or immune cells to control dysbiosis was not resolved\", \"Antimicrobial peptide targets of IκBζ not identified\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"In synovial fibroblasts, IL-17A/TNF co-stimulation was shown to selectively induce IκBζ, which cooperates with CUX1 and NF-κB p65 to drive CXCL1–3 transcription through a composite promoter motif, distinguishing the IκBζ-dependent gene program from TNF-only responses.\",\n      \"evidence\": \"siRNA with RNA-seq, dose-response, and genetic epistasis by sequential knockdown in primary human synovial fibroblasts\",\n      \"pmids\": [\"32079724\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct IκBζ–CUX1 physical interaction not demonstrated\", \"Whether IκBζ/CUX1 cooperation generalizes beyond synovial fibroblasts unknown\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"STAT3 and C/EBPβ were identified as cooperative activators of the NFKBIZ promoter while STAT1 acts as a suppressor independent of Y701 phosphorylation, resolving how IL-17 signaling drives NFKBIZ transcription and how IFN-γ downstream STAT1 opposes it.\",\n      \"evidence\": \"Promoter deletion/mutation, siRNA, co-overexpression, and STAT1 phospho-mutant in HaCaT keratinocytes\",\n      \"pmids\": [\"35537286\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo validation of STAT1 repression of NFKBIZ not performed\", \"Mechanism of phosphorylation-independent STAT1 repression unclear\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Regnase-1 and Regnase-3 were established as post-transcriptional destabilizers of Nfkbiz mRNA in hematopoietic stem/progenitor cells; their loss causes Nfkbiz accumulation that remodels chromatin accessibility at myeloid loci and shifts lineage fate from lymphoid to myeloid, revealing IκBζ as a master epigenetic regulator of hematopoietic lineage commitment.\",\n      \"evidence\": \"Conditional double-KO mice with scRNA-seq, scATAC-seq, antisense oligonucleotide treatment, and in vivo rescue\",\n      \"pmids\": [\"37922454\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which IκBζ remodels chromatin accessibility (direct vs. indirect) not resolved\", \"Whether IκBζ partners with specific chromatin remodelers in HSPCs is unknown\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"TRIM16 was identified as an E3 ubiquitin ligase that directly ubiquitinates IκBζ at K48 for proteasomal degradation, establishing the first defined mechanism for IκBζ protein turnover and linking it to NF-κB attenuation.\",\n      \"evidence\": \"Co-immunoprecipitation, ubiquitination assay, proteasomal degradation assay in HCC cells\",\n      \"pmids\": [\"38581570\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Specific lysine residue(s) on IκBζ modified by TRIM16 not mapped\", \"Reciprocal IP and in vitro reconstitution not reported\", \"Physiological relevance beyond HCC not demonstrated\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Epistatic genetic experiments in intestinal epithelium demonstrated that Nfkbiz is the obligate downstream effector of Regnase-1-regulated IL-17 signaling that drives microbiota-dependent inflammation and colon tumorigenesis, as Nfkbiz knockout fully abrogated the tumor-promoting effect of Regnase-1 deletion.\",\n      \"evidence\": \"Conditional Regnase-1 intestinal KO crossed with Nfkbiz KO mice; IL-17 antibody neutralization; antibiotic treatment; transcriptome analysis\",\n      \"pmids\": [\"40460118\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct transcriptional targets of IκBζ in intestinal epithelium not comprehensively defined\", \"Whether IκBζ-driven tumorigenesis operates through the same CUX1/p65 mechanism as in synovial fibroblasts is unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The structural basis of IκBζ interaction with NF-κB subunits, the mechanism by which IκBζ remodels chromatin in hematopoietic progenitors, and the identity of IκBζ-specific target genes in keratinocytes that maintain barrier immunity remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No crystal/cryo-EM structure of IκBζ–p50 complex\", \"Chromatin remodeler partners of IκBζ in HSPCs unidentified\", \"Full IκBζ target gene repertoire in skin keratinocytes not defined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 8, 13, 14]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [8, 13, 16]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 7, 8]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [0, 2, 3, 4, 8, 12, 13, 18]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [5, 8, 9, 10, 13, 15, 17]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [5, 8, 13, 15, 16]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [11, 16]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"NFKB1\",\n      \"CUX1\",\n      \"CEBPB\",\n      \"TRIM16\",\n      \"ZC3H12A\",\n      \"ZC3H12C\",\n      \"FUS-DDIT3\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}