| 2010 |
IRF2BP2 was identified as a novel component of the TEAD4/VGLL4 transcription factor complex via yeast 2-hybrid screen from a human heart cDNA library, confirmed by coimmunoprecipitation and mammalian 2-hybrid assays. Coexpression of IRF2BP2 with TEAD4/VGLL4 or TEAD1 potently activated VEGFA expression, while knockdown of IRF2BP2 reduced VEGFA expression in C2C12 muscle cells. |
Yeast 2-hybrid, coimmunoprecipitation, mammalian 2-hybrid, siRNA knockdown |
FASEB journal |
High |
20702774
|
| 2008 |
IRF2BP2 was identified as a direct transcriptional target of p53. Upregulation of IRF2BP2 after actinomycin D treatment is p53-dependent. Overexpressed IRF2BP2 impedes p53-mediated transactivation of p21 and Bax genes. Knockdown of IRF2BP2 leads to upregulation of p21 and faster induction of apoptosis after doxorubicin or actinomycin D treatment, indicating IRF2BP2 modulates cell survival decisions during p53 stress response. |
Luciferase reporter assay, siRNA knockdown, overexpression in multiple cell lines, actinomycin D/doxorubicin treatment |
Nucleic acids research |
High |
19042971
|
| 2015 |
IRF2BP2 is required for MEF2-dependent activation of KLF2 (Krüppel-like factor 2) in macrophages. Promoter studies revealed this dependence. IRF2BP2-deficient macrophages have markedly reduced KLF2 expression, impaired cholesterol efflux due to inability to activate ABCA1, and increased M1 inflammatory activation. Restoring KLF2 in IRF2BP2-deficient macrophages rescued these defects. |
Macrophage-specific conditional knockout mice, promoter/luciferase assay, cholesterol efflux assay, genetic rescue experiment |
Circulation research |
High |
26195219
|
| 2016 |
Ectopic expression of IRF2BP2 in murine primary CD4 T cells reduced CD25 expression, STAT5 phosphorylation, CD69 expression, and impaired proliferative capacity. In vivo, IRF2BP2-overexpressing transferred cells displayed impaired expansion, establishing IRF2BP2 as a repressor of naive CD4 T cell activation and clonal expansion downstream of TCR triggering. |
Retroviral transduction of primary murine CD4 T cells, in vivo adoptive transfer, flow cytometry, phospho-STAT5 analysis |
Journal of leukocyte biology |
Medium |
27286791
|
| 2017 |
IRF2BP2 directly interacted with the C-terminal transactivation domain of NFAT1, competing with MEF2C and disturbing their transcriptional synergism, thereby inhibiting NFAT1-transactivated hypertrophic transcriptome. Cardiomyocyte-specific Irf2bp2 knockout exacerbated aortic banding- and angiotensin II-induced cardiac hypertrophy, while Irf2bp2 transgenic overexpression was protective. The effect of Irf2bp2 deficiency was rescued by NFAT1 blockade. |
Cardiomyocyte-specific conditional KO and transgenic overexpression mice, Co-IP, epistasis rescue by NFAT1 blockade, aortic banding/angiotensin II models |
Hypertension |
High |
28716987
|
| 2017 |
Loss of IRF2BP2 in microglia leads to increased inflammatory cytokine expression in response to LPS and impaired anti-inflammatory marker activation in response to IL-4. IRF2BP2-deficient mice had larger brain infarctions after photothrombotic stroke with fewer anti-inflammatory M2 microglia. IRF2BP2 also mediates the anti-inflammatory and neuroprotective effect of IFNβ, which was lost in IRF2BP2-deficient macrophages. |
Macrophage/microglia-specific conditional KO mice, photothrombosis stroke model, LPS/IL-4 stimulation, cytokine measurement, IFNβ treatment |
Frontiers in cellular neuroscience |
High |
28769762
|
| 2019 |
IRF2BP2 overexpression suppresses osteoclast differentiation and enhances osteoblast differentiation; these effects were reversed by KLF2 knockdown, establishing the IRF2BP2/KLF2 axis as a regulator of osteoclast and osteoblast differentiation. |
Overexpression and siRNA knockdown in osteoclast precursor cells and osteoblasts, differentiation assays, marker gene expression |
BMB reports |
Medium |
31186082
|
| 2019 |
IRF2BP2 modulates glucocorticoid receptor (GR) and NF-κB transcriptional activity. GC treatment changes chromatin binding of IRF2BP2, with IRF2BP2-binding sites co-occurring with GR binding sites. Depletion of IRF2BP2 modulates transcription of GC-regulated genes and alters responses to both glucocorticoids and TNF in A549 cells, positioning IRF2BP2 as a coregulator of GR-NF-κB crosstalk. |
ChIP-seq, siRNA knockdown, transcriptomic analysis in HEK293 and A549 cells |
Journal of steroid biochemistry and molecular biology |
Medium |
31145973
|
| 2019 |
In zebrafish, VGLL4 sequesters IRF2BP2 via the VGLL4 TDU1 and IRF2BP2 RING finger domains, thereby inhibiting IRF2BP2's repression of alas2 (aminolevulinate synthase 2) expression and heme biosynthesis. IRF2BP2 depletion rescued impaired erythroid terminal differentiation in vgll4b-deficient zebrafish, establishing an oxygen-sensing pathway: NOTCH1→HIF1α→VGLL4→IRF2BP2→alas2. |
CRISPR/Cas9 knockout zebrafish, genetic epistasis rescue (irf2bp2 depletion rescuing vgll4b mutant), domain-mapping experiments |
Redox biology |
High |
31539803
|
| 2020 |
IRF2BP2 directly binds the promoter region of ATF3 (activating transcription factor 3) as a transcriptional repressor, as demonstrated by ChIP-seq and luciferase assay. Hepatocyte-specific Irf2bp2 knockout exacerbated high-fat diet-induced hepatic steatosis, while Irf2bp2 overexpression was protective. ATF3 knockdown significantly relieved IRF2BP2 knockout-exaggerated hepatosteatosis in vitro. |
Hepatocyte-specific conditional KO and adeno-associated virus overexpression in mice, ChIP-seq, luciferase assay, digital gene expression, ATF3 siRNA rescue |
Hepatology |
High |
31529495
|
| 2020 |
miR-155-5p targets IRF2BP2 mRNA (validated by luciferase reporter assay). Immunoprecipitation showed that IRF2BP2 binds NFAT1, and oroxylin A increases this binding, reducing iNOS-driven inflammation. shRNA knockdown of miR-155-5p in bone marrow ameliorated LPS-induced acute lung injury in mice. |
Luciferase reporter assay, immunoprecipitation, shRNA in vivo, LPS-induced lung injury mouse model |
American journal of physiology. Cell physiology |
Medium |
33052070
|
| 2021 |
IRF2BP2 is required to attenuate STAT1 transcriptional activity; IRF2BP2 c.625_665del mutation failed to suppress STAT1 transcriptional activity in a luciferase reporter system. Patient cells with this mutation showed overexpression of STAT1 protein and increased constitutive activation of STAT1 and STAT5, as well as elevated interferon-inducible gene expression. |
Luciferase reporter system, flow cytometry (phospho-STAT), patient PBMC analysis, NanoString gene expression |
Pharmaceuticals |
Medium |
34451894
|
| 2022 |
IRF2BP2 was identified as a novel HNF4α co-repressor. This interaction could not be detected by conventional immunoprecipitation but was identified through novel proteomic techniques sensitive to biochemically labile interactions. IRF2BP2 repressed HNF4α transcriptional activity dependent on its E3 ubiquitin ligase activity. IRF2BP2 deficiency in HepG2 cells induced gluconeogenic genes comparable to forskolin-treated wild-type cells. |
Novel proteomic approach for biochemically labile interactions, luciferase reporter assay, IRF2BP2 gene deletion in HepG2 cells, E3 ubiquitin ligase domain mutant |
Biochemical and biophysical research communications |
Medium |
35609419
|
| 2023 |
Agmatine binds directly to IRF2BP2 (identified by protein microarray). This competitive binding frees IRF2BP2-bound IRF2, allowing free IRF2 to translocate to the nucleus of BV2 microglia. Translocated IRF2 activates KLF4 transcription, increasing CD206-positive (M2) microglia cells. |
Protein microarray binding screen, cell treatment with agmatine, nuclear translocation assay, flow cytometry |
Inflammation research |
Medium |
37314519
|
| 2024 |
IRF2BP2 interacts with the AP-1 heterodimer ATF7/JDP2, is recruited by this dimer to chromatin, and counteracts its gene-activating function. Loss of IRF2BP2 leads to overactivation of inflammatory pathways and strongly reduced AML cell proliferation, defining a pro-oncogenic inflammatory equilibrium maintained by the ATF7/JDP2-IRF2BP2 regulatory axis. |
Co-immunoprecipitation, ChIP, siRNA/KO loss-of-function, transcriptomic analysis in AML cells |
Nucleic acids research |
High |
38801077
|
| 2024 |
Structural and biochemical studies revealed that the RING domain of IRF2BP2 binds a conserved RxSVI motif present in IRF2, VGLL4, and ZBTB16. The motif-containing peptides form a short loop and β-strand recognized by the RING domain. IRF2BP2 regulates megakaryocytic differentiation through its interaction with ZBTB16 via this RxSVI motif. |
Motif discovery, X-ray crystallography/structural analysis, biochemical binding assays, cell biological differentiation assays |
Nature communications |
High |
39616187
|
| 2024 |
In T-ALL cells, IRF2BP2 is driven by a super-enhancer activated by master transcription factors ERG, ELF1, and ETS1. IRF2BP2 cooperates with master TFs to target the enhancer of the RAG1 gene and modulate its expression. Loss of IRF2BP2 affects MYC and E2F pathways. Hematopoietic-specific IRF2BP2 knockout mice showed minimal impact on normal T cell development but IRF2BP2 was crucial for T-ALL cell growth and survival in vitro and in vivo. |
CUT&Tag, immunoprecipitation, conditional KO mice, in vitro and in vivo T-ALL growth assays, transcriptomic analysis |
Advanced science |
High |
39454110
|
| 2024 |
In neuroblastoma, super-enhancer-driven IRF2BP2 is activated by master transcription factors MYCN, MEIS2, and HAND2. AP-1 family proteins shape chromatin accessibility to expose IRF2BP2 binding sites, enabling AP-1 and IRF2BP2 to collaboratively stimulate expression of the ALK susceptibility gene, thereby maintaining the highly proliferative NB phenotype. |
ChIP-seq, chromatin accessibility analysis, transcriptome sequencing, loss-of-function experiments, in vivo xenograft models |
Neuro-oncology |
Medium |
38864832
|
| 2025 |
IRF2BP2 directly represses lipolysis-related genes including LIPE (encoding hormone sensitive lipase) in adipocytes, as shown by ChIP-seq demonstrating direct promoter binding. Adipocyte-selective Irf2bp2 deletion in mice increased Lipe expression and free fatty acid levels, causing adipose tissue inflammation and glucose intolerance. |
RNA-seq, ChIP-seq, adipocyte-specific conditional KO mice, primary human adipocyte KO and OE |
Science advances |
High |
39752494
|
| 2025 |
In ven/aza-resistant AML, MCL1 was identified as an IRF2BP2 binding partner by co-immunoprecipitation and mass spectrometry. This MCL1-IRF2BP2 interaction results in cytoplasmic sequestration of IRF2BP2, causing loss of transcriptional repression and increased expression of IRF2BP2 target gene ACSL1, an enzyme required for fatty acid oxidation. Inhibition of ACSL1 impaired ven/aza-resistant leukemic stem cells. |
Co-IP + mass spectrometry, subcellular fractionation, ACSL1 inhibition functional assay, metabolite profiling |
bioRxivpreprint |
Medium |
40475530
|
| 2025 |
IRF2BP2 cooperates with TRIM28 and DNMT1 to epigenetically silence transposable elements (TEs), particularly HERV-K/LTR5_Hs, in AML cells. Loss of IRF2BP2 induced differentiation, apoptosis, and TE transcriptional activation. CRISPR-mediated activation of HERV-K/LTR5_Hs recapitulated IRF2BP2 loss phenotypes, and re-silencing of HERV-K partially rescued these effects. |
Single-cell Perturb-seq screen, CRISPR activation/silencing, co-immunoprecipitation, AML patient primary cells |
bioRxivpreprint |
Medium |
|
| 2025 |
The IRF2BP2::JAK2 fusion protein localizes to the cytoplasm and drives constitutive JAK-STAT signaling, conferring cytokine-independent growth in Ba/F3 cells engineered by CRISPR-Cas9 to express the fusion. Both type I (ruxolitinib) and type II (CHZ868) JAK inhibitors potently inhibited this fusion kinase. |
CRISPR-Cas9 genome engineering of Ba/F3 cells, cytokine-independent growth assay, JAK inhibitor treatment, subcellular localization |
Genes, chromosomes & cancer |
High |
41711169
|
| 2024 |
Variants in the C-terminal RING finger domain of IRF2BP2 caused irregular aggregate formation and non-nuclear distribution, while N-terminal zinc finger domain variants retained normal nuclear localization. Immunoblotting revealed impaired IRF2 and NFκB1 (p50) nuclear localization in IRF2BP2 mutants compared to wild-type, indicating that IRF2BP2 controls nuclear translocation of both IRF2 and NF-κB. |
Confocal fluorescence microscopy, Western blotting, overexpression of EGFP-fused mutants in HEK293 cells |
Clinical immunology |
Medium |
39059757
|
| 2022 |
Irf2bp2 is required for fetal hepatic erythropoiesis through the expansion of erythromyeloid progenitors. Germline ablation of Irf2bp2 caused near-complete lethality with predominantly upregulation of interferon-responsive genes and elevation of hematopoietic stem cell-enriched transcription factors (Etv6, Fli1, Ikzf1, Runx1) in Irf2bp2-null livers. |
Germline KO mice, transcriptome profiling (liver, heart, skeletal muscle), FISH for chimerism |
Frontiers in immunology |
Medium |
35865523
|