| 2005 |
ZBTB38 (CIBZ) physically associates with the transcriptional corepressor CtBP via a conserved PLDLR motif. CIBZ represses transcription through two independent repression domains: an N-terminal BTB domain (HDAC-independent) and a PLDLR-containing RD2 region (HDAC-dependent). CIBZ redistributes CtBP from diffuse nuclear localization to pericentromeric foci; mutation of the PLDLR motif abolishes CtBP interaction, RD2 repression activity, and pericentromeric targeting of CtBP, but not CIBZ's own localization to pericentromeric foci. |
Co-immunoprecipitation, site-directed mutagenesis of PLDLR motif, heterologous DNA-targeting transcriptional repression assay, immunofluorescence localization |
Genes to cells : devoted to molecular & cellular mechanisms |
High |
16115196
|
| 2008 |
ZBTB38 (CIBZ) is a direct substrate of caspase-3: in vitro caspase cleavage assays with mutagenesis identified two caspase-3 recognition sites in CIBZ. Knockdown of CIBZ induces apoptosis through the mitochondrial pathway (activating caspases-3, -7, and -9 and PARP cleavage) in a p53-independent manner. |
In vitro caspase-3 cleavage assay, site-directed mutagenesis of caspase recognition sites, siRNA knockdown, annexin V/PI flow cytometry, caspase activation assays in p53-/- cells |
The Journal of biological chemistry |
High |
18375381
|
| 2011 |
ZBTB38 (CIBZ) binds to a methylated CpG-containing proximal region of the Myogenin (Myog) promoter and represses Myog transcription in a DNA methylation-dependent manner, thereby suppressing myogenic differentiation. Loss of CIBZ promotes myogenic differentiation; ectopic CIBZ expression impairs it. Importantly, CIBZ-mediated repression does not require demethylation of the Myog promoter CpGs. |
siRNA knockdown and ectopic overexpression in C2C12 cells, chromatin immunoprecipitation (ChIP), luciferase reporter assay, myogenic differentiation assays in vitro and in vivo |
Cell research |
High |
21625269
|
| 2012 |
ZBTB38 (CIBZ) promotes ESC proliferation and G1/S transition at least in part by post-transcriptionally maintaining Nanog protein levels. CIBZ deletion or siRNA knockdown inhibits ESC proliferation and delays G1/S transition; ectopic CIBZ expression accelerates it. Constitutive overexpression of Nanog partially rescues the proliferation defect caused by CIBZ knockdown. |
siRNA knockdown, CIBZ deletion, ectopic overexpression in ESCs, cell cycle analysis, Nanog rescue experiment, western blotting |
The Journal of biological chemistry |
Medium |
22315219
|
| 2014 |
RBBP6 (an E3 ubiquitin ligase) ubiquitinates ZBTB38, destabilizing it. ZBTB38 in turn negatively regulates transcription and chromatin-associated levels of the MCM10 replication factor. Cells lacking RBBP6 accumulate ZBTB38, which causes MCM10 downregulation, reduced replication fork progression, and increased DNA damage at common fragile sites. |
Ubiquitination assays, siRNA knockdown of RBBP6 and ZBTB38, ChIP, DNA fiber assay for replication fork speed, FISH for common fragile site stability |
Cell reports |
High |
24726359
|
| 2016 |
ZBTB38 (CIBZ) binds directly to the promoters of Brachyury (T) and Mesp1 in undifferentiated ESCs, repressing their transcription and thereby suppressing mesodermal and cardiac differentiation. Loss of CIBZ induces mesoderm specification and cardiomyocyte differentiation; overexpression delays these processes. |
ChIP assay, luciferase reporter assay, CIBZ knockout and overexpression in ESCs, differentiation assays toward cardiomyocytes |
Scientific reports |
High |
27659197
|
| 2017 |
ZBTB38's C-terminal zinc fingers (ZFs 6–9) exhibit high-affinity, methyl-CpG-selective DNA binding to a consensus sequence distinct from the N-terminal ZF consensus. These C-terminal ZFs can directly occupy promoters containing this motif in cells in a DNA methylation-dependent manner and modulate transcriptional responses at those loci. |
Fluorescence polarization DNA binding assays, small-angle X-ray scattering (SAXS) structural modeling, ChIP in cell lines, gene expression analysis |
Journal of molecular biology |
Medium |
29287967
|
| 2017 |
ATF4 (an ER-stress-inducible transcription factor) directly activates ZBTB38 transcription by binding to the ZBTB38 promoter under normal conditions; this binding is significantly reduced following spinal cord injury, causing decreased ZBTB38 expression and increased ER stress-associated apoptosis. |
ChIP-qPCR, lentiviral overexpression of ZBTB38 in SCI mouse model, apoptosis assays, motor function assessment |
Oncotarget |
Medium |
28514761
|
| 2018 |
Crystal structure of ZBTB38 C-terminal zinc fingers 6–9 in complex with a methylated consensus DNA sequence (1.75 Å resolution) reveals that methyl-selective binding is mediated by base-specific interactions from residues in the α-helices of ZF7 and ZF8 at the 5' mCpG site, while ZF6 and ZF9 serve structural stabilization roles. This represents a mode of mCpG recognition distinct from other ZF methyl-CpG binding proteins. |
X-ray crystallography (1.75 Å), solution NMR spectroscopy, electrophoretic mobility shift assay (EMSA) |
The Journal of biological chemistry |
High |
30355731
|
| 2018 |
The deubiquitinase USP9X interacts with ZBTB38, deubiquitinates it, and stabilizes it. USP9X is itself stabilized by oxidative stress. The USP9X/ZBTB38 axis limits basal ROS production and is required for the cellular response to acute oxidative stress; loss of either protein increases ROS toxicity. |
Co-immunoprecipitation, ubiquitination assay, mass spectrometry identification of USP9X as ZBTB38 interactor, siRNA knockdown of USP9X and ZBTB38, ROS measurement assays |
Nucleic acids research |
High |
29490077
|
| 2018 |
ZBTB38 binds methylated promoters of IL1r2 (interleukin-1 receptor 2) in B cells and represses IL1r2 transcription, forming a molecular bridge between an arthritis-associated DNA hypomethylation epimutation at the Zbtb38 locus and silencing of an anti-inflammatory gene. |
ChIP, gene expression studies, correlation of Zbtb38 promoter methylation with IL1r2 expression in a murine RA model |
Biochimica et biophysica acta. Gene regulatory mechanisms |
Medium |
30343694
|
| 2018 |
ZBTB38 regulates the cellular response to DNA methyltransferase inhibitors (DNMTi; 5-azacytidine, decitabine, zebularine): DNMTi treatment causes ZBTB38 protein downregulation. ZBTB38 depletion enhances DNMTi toxicity, and this effect is mediated at least in part through upregulation of CDKN1C mRNA. |
siRNA knockdown of ZBTB38, western blotting, cell viability assays, RT-PCR for CDKN1C in multiple cancer cell lines |
Oncogenesis |
Medium |
30310057
|
| 2021 |
ZBTB38 binds the DKK1 (Dickkopf WNT signaling pathway inhibitor 1) locus and promotes DKK1 expression in prostate cancer cells. Reduction of DKK1 rescues ZBTB38-mediated suppression of migration and proliferation. PRKDC (DNA-PKcs) was identified as a ZBTB38-interacting protein that represses ZBTB38 function. |
ChIP demonstrating ZBTB38 binding to DKK1 promoter, DKK1 knockdown rescue experiments, Co-IP identifying PRKDC as interactor, cell migration and proliferation assays |
Cell death & disease |
Medium |
34697293
|
| 2022 |
ZBTB38 binds methylated CpG-containing sequences in vivo at two classes of consensus sites (corresponding to its N-terminal and C-terminal ZF domains). Approximately 10% of ZBTB38 binding sites overlap with CTCF binding, while 90% reside in closed chromatin not occupied by other mapped factors; ~one-third of ZBTB38 sites are found upstream of long active CpG islands. |
ChIP-seq in human cell line, intersection with ENCODE datasets for chromatin state and other TF binding |
Epigenetics |
Medium |
36000449
|
| 2022 |
Heterozygous loss of Zbtb38 in mice leads to early embryonic lethality shortly after implantation due to reduced epiblast proliferation and increased apoptosis. This is associated with reduced expression of Nanog and Sox2. Zbtb38 is dispensable for ESC establishment and identity in vitro. |
Conditional knockout via Cre-loxP, immunofluorescence for proliferation and apoptosis markers, qRT-PCR and western blotting for Nanog/Sox2, ESC derivation from knockout embryos |
Cell proliferation |
High |
35297517
|
| 2024 |
ZBTB38 regulates autophagy initiation: ZBTB38 knockdown blocks autophagy (decreased LC3B II/I ratio, increased p62). RB1CC1/FIP200, a key component of the autophagy initiation complex, is transcriptionally regulated by ZBTB38 and decreases ~4.2-fold upon ZBTB38 knockdown. Overexpression of RB1CC1 in ZBTB38-knockdown cells rescues the autophagy block and restores cell proliferation. |
ZBTB38 siRNA knockdown, LC3B/p62 western blotting, transcriptome sequencing, RB1CC1 rescue overexpression, lentiviral ZBTB38 overexpression in SCI mouse model |
Gene |
Medium |
30075197
|
| 2026 |
Zbtb38 transcriptionally activates XIAP by binding E-box motifs within the upstream regulatory regions of the XIAP gene. XIAP overexpression rescues apoptosis induced by Zbtb38 knockdown, indicating that Zbtb38-associated anti-apoptotic function is at least partially XIAP-dependent. This operates independently of p53 status. |
Loss- and gain-of-function experiments (siRNA knockdown and overexpression), ChIP for ZBTB38 binding to XIAP regulatory regions, XIAP rescue overexpression, apoptosis assays in ESC differentiation and cancer cell lines |
Journal of molecular cell biology |
Medium |
41842907
|
| 2026 |
The N-terminal zinc finger (ZF) domain of ZBTB38 defines a distinct mCpG-containing consensus DNA sequence for binding. Unlike the other two ZBTB MBP family members (ZBTB33/Kaiso and ZBTB4), the shared core ZF domain of ZBTB38 discriminates against TpG-containing DNA (i.e., requires the methyl group), and at least one additional N-terminal ZF is required to stabilize DNA engagement. Each ZF domain preferentially recognizes its own cognate methylated consensus motif. |
Fluorescence polarization DNA binding assays, systematic mutagenesis of ZF domains, in vitro binding with mCpG vs. TpG-containing oligonucleotides |
bioRxiv : the preprint server for biologypreprint |
Medium |
42146383
|