| 1991 |
Id2 contains a helix-loop-helix (HLH) dimerization motif but lacks the basic DNA-binding domain; it selectively heterodimerizes with and inhibits the DNA-binding activity of one class of bHLH transcription factors (e.g., E2A/E47, E2B/m3) but not another (TFE3, USF, AP4), and homodimerizes poorly. |
In vitro binding and DNA-binding inhibition assays; gene cloning and sequence analysis; chromosome mapping |
Molecular and cellular biology |
High |
1922066
|
| 1996 |
Id2 (but not Id1 or Id3) directly binds pRb, p107, and p130 in vitro and in vivo, neutralizing their growth-suppressive activity and reversing cell-cycle arrest imposed by pRb family members and CDK inhibitors p16 and p21; Id2 expression also reduces cyclin D1 levels and cyclin D1–CDK4 complexes. |
In vitro binding assays; co-immunoprecipitation in transfected Saos-2 cells; cell-cycle arrest rescue assays; Western blot for cyclin D1 |
Molecular and cellular biology |
High |
8649364
|
| 1997 |
Id2 is phosphorylated by cyclin E–CDK2 and cyclin A–CDK2 (but not cyclin D–CDKs) on a serine within a CDK consensus site in late G1; phosphorylation of Id2 in serum-stimulated fibroblasts correlates with restoration of E-box-dependent DNA-binding complexes, indicating that CDK-mediated phosphorylation relieves Id2-mediated inhibition of bHLH transcription factors. |
In vitro kinase assays with purified cyclin–CDK complexes; in vivo phosphorylation in synchronised human diploid fibroblasts; electrophoretic mobility shift assay (EMSA) |
The EMBO journal |
High |
9029153
|
| 2000 |
Id2 is a direct transcriptional target of Myc-family oncoproteins; Id2 acts as a dominant-negative antagonist of Rb-family proteins; in neuroblastoma cells overexpressing N-Myc, Id2 is in molar excess of active Rb, and cell-cycle progression driven by Myc oncoproteins requires Id2-mediated inactivation of Rb. Id2–Rb double-knockout embryos survive to term, revealing a functional epistatic relationship. |
Genetic double-knockout rescue; quantitative protein analysis; transcriptional activation assays; neuroblastoma cell analysis |
Nature |
High |
11034201
|
| 2004 |
Id2 is degraded by the ubiquitin–proteasome system via N-terminal ubiquitination: a Myc-tag fused to the N-terminus (but not C-terminus) stabilises Id2, lysine-less Id2 is still efficiently degraded (ubiquitin conjugated to α-NH2 group), and deletion of the first 15 N-terminal residues stabilises the protein, identifying this domain as an E3 recognition element. |
Ubiquitination assays; N-terminal tagging stabilisation experiments; lysine-less mutant degradation assays; proteasome inhibitor experiments |
Biochemical and biophysical research communications |
High |
14733935
|
| 2005 |
Polycystin-2 (PC2) directly interacts with Id2; this interaction is regulated by PC1-dependent phosphorylation of PC2. Id2 expression suppresses p21 induction by PC1 or PC2, and Id2 shows enhanced nuclear localisation in cystic kidneys. RNAi knockdown of Id2 corrects the hyperproliferative phenotype of PC1-mutant cells. |
Co-immunoprecipitation; phosphorylation assays; RNAi knockdown with proliferation readout; immunofluorescence in human/mouse cystic kidney tissue |
Nature cell biology |
High |
16311606
|
| 2006 |
APC/C(Cdh1) targets Id2 for proteasomal degradation through a conserved destruction box (D-box) motif in neurons. Id2 interacts with core APC/C subunits and Cdh1; D-box mutants of Id2 resist Cdh1 binding, remain stable after cell-cycle exit, and enhance axonal growth in cerebellar granule neurons in vitro and in vivo, overcoming myelin inhibitory signals. Degradation of Id2 permits accumulation of the Nogo receptor, a bHLH target gene product that inhibits axonal growth. |
Co-immunoprecipitation; APC/C interaction assays; D-box mutagenesis; cerebellar granule neuron axon growth assays in vitro and in vivo; gene expression analysis |
Nature |
High |
16810178
|
| 2006 |
The actin-associated LIM-domain protein ENH (enigma homolog) is a cytoplasmic retention factor for Id2: ENH binds the HLH domain of Id2 in vitro and in vivo, its overexpression in neuroblastoma cells translocates Id2 from nucleus to cytoplasm and inactivates its transcriptional and cell-cycle-promoting functions, and RNAi silencing of ENH prevents cytoplasmic relocation of Id2 during retinoic acid-induced differentiation. |
Co-immunoprecipitation; in vitro binding assay; fluorescence microscopy of subcellular localisation; RNAi knockdown with localisation and functional readouts |
Proceedings of the National Academy of Sciences of the United States of America |
High |
16549780
|
| 2006 |
Id2 prevents E-protein-mediated activation of p57Kip2 expression in neuroblastoma cells: E47 directly activates p57Kip2 transcription to block S-phase entry, Id2 suppresses this activation, and RNAi knockdown of p57Kip2 fully reverses E47-mediated cell-cycle arrest, establishing p57Kip2 as the functionally relevant CDK inhibitor target of the E-protein/Id2 axis in neural cells. |
Microarray gene expression profiling; reporter assays; RNAi knockdown; cell-cycle analysis |
Molecular and cellular biology |
High |
16705184
|
| 2003 |
TGF-β induces Id2 expression in dendritic cell precursors; Id2 is required for development of Langerhans cells and splenic CD8α+ DCs, and Id2 represses B-cell lineage genes in DCs, establishing a TGF-β–Id2 signaling axis that controls DC lineage choice. |
Id2-knockout mouse analysis; in vitro DC differentiation with TGF-β stimulation; gene expression profiling |
Nature immunology |
High |
12598895
|
| 2007 |
A 1.2 kb Id2 promoter fragment is cooperatively regulated by Nkx2-5 and Tbx5 in vitro and is sufficient for conduction-system-specific expression in vivo; compound haploinsufficiency of Tbx5 and Id2 (or Tbx5 and Nkx2-5) blocks embryonic specification of the ventricular conduction system, placing Id2 downstream of Tbx5/Nkx2-5 in a conduction system developmental pathway. |
SAGE transcriptional profiling; Id2-deficient mouse cardiac analysis; promoter reporter assay; compound haploinsufficiency genetic epistasis; in vivo transgenic reporter |
Cell |
High |
17604724
|
| 2001 |
Id2 is a direct transcriptional target of β-catenin/TCF4; a TCF4-binding motif in the Id2 promoter is identified by EMSA and supershift, and site-directed mutagenesis abolishes promoter activity; β-catenin overexpression increases Id2 protein, and Id2 expression promotes anchorage-independent survival of colon carcinoma cells. |
Reporter assay; EMSA and supershift; site-directed mutagenesis; transfection; anchorage-independent growth assay |
The Journal of biological chemistry |
High |
11572874
|
| 2004 |
HIF-1 directly activates Id2 transcription in hypoxic neuroblastoma cells via two functional HIF-1 binding sites at −725 and −1893 relative to the transcriptional start site, demonstrated by EMSA and ChIP; Id2 promoter-luciferase constructs are HIF-1-specifically activated in transfection assays. |
EMSA; chromatin immunoprecipitation (ChIP); luciferase reporter assay; actinomycin D transcription inhibition |
The Journal of biological chemistry |
High |
15252039
|
| 2005 |
C/EBPβ directly activates Id2 transcription: nuclear translocation of C/EBPβ rapidly induces endogenous Id2; the most proximal of three C/EBPβ-binding elements in the 2.3 kb Id2 promoter is required for transactivation; EMSA identifies this as a C/EBPβ core-binding sequence; ChIP confirms C/EBPβ occupancy at the Id2 promoter in vivo; Id2 expression is reduced in C/EBPβ-deficient mammary glands. |
Inducible C/EBPβ-ERT nuclear translocation; reporter assay; EMSA; ChIP; Northern blot in C/EBPβ-null mammary glands |
Nucleic acids research |
High |
15809228
|
| 2010 |
BMP6 activates Id2 transcription through Smad-binding elements (two GGCGCC palindromes and one GTCT element) in the Id2 promoter; gel shift and ChIP assays confirm physical Smad binding; mutation of these elements abolishes BMP responsiveness; a novel bipartite CGCC sequence contributes to Smad target recognition. |
Reporter assay; gel-shift (EMSA); ChIP; site-directed mutagenesis; BMP receptor inhibitor |
Biochemical and biophysical research communications |
High |
20674548
|
| 2003 |
TGF-β represses Id2 expression in epithelial cells via induction of Mad2 and Mad4, which replace Myc-Max complexes with Mad-Max complexes on the Id2 promoter, providing a mechanism for TGF-β cytostatic program independent of c-Myc downregulation. |
Reporter assay; ChIP showing Myc-Max to Mad-Max promoter switching; Western blot; quantitative expression analysis across multiple epithelial cell lines |
The Journal of biological chemistry |
High |
12824180
|
| 2006 |
Id2 acts as a master regulator of VEGF expression in pituitary tumor cells and neuroblastoma; in Rb+/− pituitary tumors, Id2-null cells show premature bHLH activation and p27Kip1 upregulation that impairs melanotrope proliferation and tumor initiation; N-Myc-driven Id2 expression is sufficient and necessary for VEGF expression in neuroblastoma. |
Id2-null/Rb+/− compound genetic mouse model; immunohistochemistry; gene expression analysis; neuroblastoma cell manipulation |
Molecular and cellular biology |
High |
15831462
|
| 2008 |
Id2 regulates erythroid development by interacting with transcription factor PU.1 and modulating PU.1 and GATA-1 activities; Id2-null mice have expanded B-cell compartments, and Id2 acts as physiologically relevant inhibitor of E2A during B lymphopoiesis through direct antagonism. |
Id2 knockout mouse analysis; retroviral transduction/overexpression; shRNA knockdown; co-immunoprecipitation of Id2 with PU.1 |
Blood |
Medium |
18523151
|
| 2010 |
Id2 promotes tumor cell migration and invasion through transcriptional repression of Semaphorin 3F (SEMA3F): E47 directly activates SEMA3F via two E-box sites in its promoter; Id2 acts as a dominant-negative inhibitor of E47, abrogating SEMA3F expression and its biological activities (F-actin depolymerisation, RhoA inactivation, migration inhibition). |
Reporter assay with E-box mutagenesis; SEMA3F knockdown rescue; migration/invasion assays; F-actin and RhoA activity assays |
Cancer research |
High |
20388805
|
| 2011 |
p53 directly represses Id2 transcription by binding a conserved site within the Id2 promoter; p53-null neural progenitor cells have elevated Id2 and increased proliferation/self-renewal; suppression of Id2 is sufficient to restore normal proliferation to p53-null NPCs; elevated Id2 expression phenocopies p53 loss. |
Chromatin immunoprecipitation; Id2 KD by RNAi; p53-null mouse NPC analysis; promoter binding assay |
Stem cells (Dayton, Ohio) |
High |
21608079
|
| 2014 |
The ubiquitin ligase ASB4 ubiquitinates and targets Id2 for proteasomal degradation in trophoblast/placental cells, promoting vascular differentiation; a degradation-resistant Id2 mutant co-expressed with ASB4 inhibits differentiation and functional vascular responses; Asb4-null placentas retain Id2 expression and show immature vascular patterning. |
Ubiquitination assay; proteasome inhibitor experiments; degradation-resistant mutant co-transfection; endothelial co-culture assays; Asb4-null mouse placenta analysis |
PloS one |
High |
24586788
|
| 2016 |
Id2 represses multiple E-protein target genes including Socs3 in NK cells; Id2 deletion in mature NK cells leads to impaired IL-15 receptor signaling and metabolic dysfunction, rescued by strong IL-15 stimulation or genetic Socs3 deletion, demonstrating that Id2 regulates NK cell homeostasis by titrating E-protein activity at Socs3 and other target loci. |
Id2 conditional KO in mature NK cells; genetic Socs3/Id2 double-KO epistasis; IL-15 receptor signaling assays; metabolic function assays |
Immunity |
High |
26795246
|
| 2016 |
Bcl6 binds the Id2 locus to repress Id2 expression in TFH cells; TH1 cells express higher Id2 than TFH cells; Id2 deficiency increases TFH frequency in an E-protein-dependent manner and blocks TH1 differentiation; Id2 reinforces TH1 differentiation by repressing E2A-dependent TFH-promoting programs. |
Id2 RNAi in T cells; T cell-specific Id2 KO mouse; ChIP (Bcl6 occupancy at Id2 locus); T cell subset phenotyping during viral infection |
Nature immunology |
High |
27213691
|
| 2016 |
PDGF signaling upregulates USP1 via E2F transcription factors; USP1 stabilises ID2 protein; genetic ablation of Id2 delays glioma-induced mortality; pharmacologic USP1 inhibition reduces ID2 levels and delays tumorigenesis in a mouse proneural glioma model, establishing a PDGF–E2F–USP1–ID2 survival signalling cascade. |
E2F ChIP at Usp1 promoter; Id2 genetic KO in glioma model; USP1 pharmacologic inhibition; comparative transcriptomics |
Cancer research |
High |
26951930
|
| 2018 |
Id2 mediates Treg-to-TH17 plasticity by sequestering the transcription activator E2A; expression of Id2 in iTreg cells reduces Foxp3 expression and induces TH17-related cytokines; Treg-specific Id2 overexpression in mice reduces the Treg compartment and causes immune dysregulation. |
Id2 overexpression in iTreg cells; Treg-specific Id2 transgenic mice; cellular fate-mapping; cytokine profiling |
Nature communications |
High |
30413714
|
| 2020 |
Monoubiquitination of FANCD2 (within the FANCI–FANCD2/ID2 complex) promotes a large-scale conformational change that increases the complex's affinity for double-stranded DNA and enables it to encircle DNA by forming a secondary 'Arm' interface; monoubiquitination of FANCI protects the ubiquitin on FANCD2 from deubiquitination by USP1–UAF1, with key hydrophobic residues of FANCI's ubiquitin mediating this protection. |
Structural and biochemical analysis of ubiquitinated ID2 complex; DNA-binding affinity assays; deubiquitination protection assays with USP1–UAF1 |
EMBO reports |
High |
32510829
|
| 2024 |
Id2 epigenetically regulates CD8+ T-cell exhaustion by binding, via its HLH domain, to Tcf3 (TCF1) and disrupting the Tcf3–Tal1 complex, thereby preventing Tcf3 from recruiting LSD1 histone demethylase to the Slamf6 promoter; this results in increased permissive H3K4me2 marks and greater chromatin accessibility at the Slamf6 promoter, promoting generation of Slamf6+ progenitor exhausted T cells. LSD1 inhibitor GSK2879552 rescues Id2-KO phenotype in tumour-bearing mice. |
Co-immunoprecipitation (HLH domain); ChIP for H3K4me2 and chromatin accessibility at Slamf6 promoter; Id2-KO mouse tumour model; LSD1 pharmacologic inhibition rescue |
Cellular & molecular immunology |
High |
38287103
|
| 2021 |
ID2 in NK cells suppresses TCF1 amplitude during maturation; elevated TCF1 in ID2-deficient NK cells arrests their maturation and limits cytokine-induced IFN-γ production and anti-metastatic function, establishing ID2 as a transcriptional brake on TCF1 that controls the balance between immature expansion and terminal NK cell differentiation. |
Id2 conditional KO in NK cells; TCF1 reporter and protein level analysis; in vivo melanoma clearance assay; cytokine stimulation assays |
The Journal of experimental medicine |
High |
33857289
|
| 2005 |
Ovol1 represses Id2 transcription in pachytene spermatocytes; Ovol1-deficient germ cells upregulate Id2 and fail to progress through the pachytene stage; Ovol1 represses the Id2 promoter in reporter assays, establishing Id2 as a direct transcriptional target of Ovol1 in male meiosis. |
Ovol1-KO mouse analysis; transcriptional profiling; Northern blot; Id2 promoter reporter assay |
Development (Cambridge, England) |
Medium |
15716349
|
| 2009 |
Ebf1 down-regulates Id2 and Id3 expression in prepro-B cells to specify B-cell fate; enforced Ebf1 expression in IL-7Rα−/− bone marrow cells potently reduces Id2 and Id3 mRNA and restores B-cell differentiation in vivo; overexpression of either Id2 or Id3 blocks B-cell specification at the prepro-B stage. |
Retroviral Ebf1 expression in IL-7Rα-null bone marrow; Id2/Id3 overexpression in wild-type bone marrow; qRT-PCR; in vivo reconstitution |
Proceedings of the National Academy of Sciences of the United States of America |
High |
19122139
|
| 2010 |
AMPK (PRKAA1/2) mediates stress-induced proteasome-dependent loss of ID2 protein in trophoblast stem cells at high stress levels, triggering differentiation; at low stress levels AMPK mediates metabolic adaptation without ID2 loss, establishing a dose-dependent AMPK–ID2 axis linking cellular stress to TSC differentiation. |
AMPK inhibitor/activator pharmacology; proteasome inhibitor experiments; PRKAA1/2 activation assays; immunoblot for ID2 in stressed TSCs |
Reproduction (Cambridge, England) |
Medium |
20876741
|
| 2007 |
Id2 controls intestinal stem cell specification by restricting Wnt signalling activity at early embryonic stages; Id2-deficient intestinal epithelial cells precociously activate Wnt target genes and generate an expanded Lgr5+ progenitor pool. |
Id2-KO mouse; cell fate mapping; ex vivo organoid culture with Wnt target gene analysis; transcriptional profiling of adult Id2-null ISCs |
The EMBO journal |
Medium |
28077488
|
| 2002 |
Id2 inhibits BETA2/NeuroD-mediated E-box-dependent gene expression in a dose-dependent manner by forming heterodimers that block BETA2/NeuroD binding to its target E-box sequence, as shown by EMSA; Id2 inhibits BETA2/NeuroD transcriptional activation in both HIT and HeLa cells. |
Yeast two-hybrid (interaction screen); EMSA; co-expression transcriptional reporter assays in HIT and HeLa cells |
Experimental & molecular medicine |
Medium |
12526101
|
| 2013 |
Id2 restrains CD8+ T-cell memory differentiation by inhibiting E2A-mediated direct activation of Tcf7 (TCF1); Id2-deficient CD8+ T cells fail to upregulate Tbx21 for short-lived effector generation and instead adopt a memory fate with elevated Eomesodermin and Tcf7. |
Id2-KO CD8+ T-cell analysis during infection; E2A binding site reporter assay; gene expression profiling |
Journal of immunology (Baltimore, Md. : 1950) |
High |
23536629
|
| 2006 |
BMP4 induces Id2 expression in AR42J pancreatic epithelial cells, and BMP4 stimulation promotes Id2 binding to NeuroD (a bHLH differentiation factor), thereby blocking endocrine differentiation and promoting expansion of pancreatic progenitors. |
BMP4 stimulation assays; co-immunoprecipitation of Id2–NeuroD; BMP4 neutralisation in mouse islet regeneration model; proliferation assays |
The Journal of biological chemistry |
Medium |
16547003
|
| 2021 |
TGF-β signalling suppresses Id2 expression to decelerate cell-cycle in developing airway basal stem cells; reduced TGF-β signalling in adult tissue regeneration restores Id2 expression and initiates proliferation; persistent Id2 expression (via Id2 OE or Tgfbr2 KO) drives basal cell hyperplasia resembling a precancerous state, establishing the TGF-β–Id2 axis as a proliferation switch in airway basal cells. |
Id2 overexpression; Tgfbr2 conditional KO; single-cell transcriptomics; genetic validation in murine airway development and regeneration models |
Developmental cell |
High |
34129836
|
| 2023 |
METTL3-mediated m6A modification stabilises ID2 mRNA in an m6A-YTHDF2-dependent manner in pancreatic cancer cells; METTL3 knockdown reduces m6A on ID2 mRNA and destabilises it; ID2 in turn controls stemness molecules NANOG and SOX2 via the PI3K–AKT pathway. |
METTL3 knockdown; m6A-seq/MeRIP; mRNA stability assay; YTHDF2 co-immunoprecipitation; PI3K–AKT pathway inhibition |
Cancer letters |
Medium |
37196908
|
| 2019 |
Mtg16 represses Id2 transcription in dendritic cell progenitors; genome-wide DNA-binding analysis identifies Id2 as a direct Mtg16 target; Mtg16-deficient pDCs and cDC progenitors show aberrant Id2 induction; genetic deletion of Id2 partially rescues impaired pDC development in Mtg16-null mice. |
Mtg16-KO mouse; genome-wide ChIP-seq (DNA-binding analysis); Id2-KO rescue epistasis; flow cytometric DC subset analysis |
The Journal of experimental medicine |
High |
24980046
|
| 2019 |
An Nfil3–Zeb2–Id2 genetic circuit controls cDC1 development: Nfil3 is required for the transition from Zeb2hi/Id2lo CDPs to Zeb2lo/Id2hi CDPs (earliest committed cDC1 progenitors); genetic epistasis shows this circuit blocks E-protein activity to exclude pDC potential and explains the switch in Irf8 enhancer usage. |
Single-cell RNA sequencing of CDPs; genetic epistasis (Nfil3 KO, Zeb2 KO, Id2 KO); DC progenitor phenotyping |
Nature immunology |
High |
31406377
|
| 1995 |
bHLH transcription factors ME1, ME2, and NSCL1 stimulate Id2 promoter activity through E-box clusters in the 5′ regulatory region; co-expression of Id2 blocks this stimulatory effect, revealing a negative feedback loop in Id2 transcriptional regulation. |
Reporter/luciferase promoter assay; co-expression in F9 cells; retinoic acid differentiation assay |
FEBS letters |
Medium |
7589553
|
| 1995 |
Id1 and Id2 can be phosphorylated in vitro by cAMP-dependent protein kinase; Id2 and Id3 can be phosphorylated by cdc2 kinase; all three (Id1, Id2, Id3) by PKC; however, phosphorylation by cAMP-kinase or PKC did not affect Id2/E47 dimerisation or DNA-binding inhibition in gel-shift assays. |
In vitro kinase assay; immunoprecipitation of phosphorylated Id1 from NGF-stimulated PC12 cells; gel-shift assay |
Biochemical and biophysical research communications |
Medium |
7864897
|
| 2022 |
Under anchorage-independent conditions, E-cadherin loss de-represses Id2 transcription via a p120-catenin/Kaiso-dependent mechanism at a canonical Kaiso-binding sequence (TCCTGCNA) in the Id2 promoter; Id2 then accumulates in the cytosol and induces CDK4/6-dependent G0/G1 arrest through interaction with hypo-phosphorylated Rb, promoting anoikis resistance and lung colonisation in ILC models. |
Loss-of-function experiments; inducible E-cadherin restoration; promoter analysis; ChIP for Kaiso; co-immunoprecipitation of Id2 with Rb; subcellular fractionation; in vivo lung colonisation assay |
Oncogene |
High |
35437308
|