{"gene":"ID3","run_date":"2026-06-10T01:55:22","timeline":{"discoveries":[{"year":1994,"finding":"ID3 protein contains a HLH dimerization domain but lacks a basic DNA-binding region; it forms heterodimers with bHLH proteins (E47 homodimers and E47/MyoD heterodimers) and inhibits their DNA-binding activity, functioning as a dominant-negative HLH protein.","method":"In vitro DNA-binding inhibition assay; heterodimer formation assay","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct in vitro DNA-binding inhibition assay with domain characterization, replicated across multiple Id family studies","pmids":["8139914"],"is_preprint":false},{"year":1996,"finding":"ID3 interacts with E12, E47, ALF1, and Id4 (all HLH proteins) as identified by yeast two-hybrid and confirmed by co-immunoprecipitation; ID3 disrupts DNA binding by these proteins in vitro and blocks transcriptional activation in cultured cells. ID3 preferentially targets E2A-class transcription factors and shows evidence of interacting with E2-2 and MyoD but not c-Myc.","method":"Yeast two-hybrid screen; co-immunoprecipitation; in vitro DNA-binding disruption assay; transcriptional reporter assay in cultured cells","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — multiple orthogonal methods (Y2H, Co-IP, in vitro binding, reporter assay) in single study, consistent with broader literature","pmids":["8759016"],"is_preprint":false},{"year":1996,"finding":"Stable overexpression of ID3 inhibits differentiation of Sol 8 muscle cells, and both the HLH and C-terminal domains of ID3 are necessary and sufficient for this dominant-negative activity. Overexpression reduces DNA-binding activity in nuclear extracts.","method":"Stable transfection; domain mutagenesis; nuclear extract DNA-binding assay; in situ hybridization","journal":"Cell growth & differentiation","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — domain mutagenesis plus functional assay in single lab, consistent with parallel study (PMID:8853902)","pmids":["8853903"],"is_preprint":false},{"year":1996,"finding":"Ectopic ID3 expression in C2C12 myoblasts impairs differentiation and promotes S-phase entry; antisense blockade of ID3 potentiates differentiation and cell cycle exit, establishing ID3 as a negative regulator of differentiation that integrates mitogenic signaling into cell cycle progression.","method":"Stable and inducible transfection; antisense knockdown; cell cycle analysis","journal":"Cell growth & differentiation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gain- and loss-of-function with defined phenotype, single lab, two complementary approaches","pmids":["8853902"],"is_preprint":false},{"year":1997,"finding":"Cyclin E–Cdk2 and cyclin A–Cdk2 phosphorylate ID3 at a conserved serine residue (Ser5) during late G1-to-S phase transition. A phosphomimetic ID3 Asp5 mutant cannot promote S-phase entry and loses ability to abrogate E-box-dependent bHLH complex formation in vitro and in vivo, whereas a non-phosphorylatable Ala5 mutant has enhanced activity. Cdk2 phosphorylation thus acts as a switch that nullifies ID3's G1 cell-cycle function and modulates its bHLH target specificity.","method":"In vitro kinase assay; site-directed mutagenesis (Ser5→Asp5 and Ser5→Ala5); E-box reporter assay; cell cycle S-phase entry assay in transfected fibroblasts","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — reconstituted in vitro phosphorylation, mutagenesis with functional validation in vivo, multiple orthogonal readouts in single study","pmids":["9372912"],"is_preprint":false},{"year":1997,"finding":"ID3 prevents adipose differentiation of 3T3-F442A preadipose cells; stably transformed cells expressing ID3 under a viral promoter are virtually unable to differentiate, and ID3 mRNA is actively transcribed in preadipose cells but shows reduced transcription during adipogenesis.","method":"Stable transfection with constitutive ID3 expression; transcription rate analysis; differentiation assay","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — stable gain-of-function with defined differentiation phenotype, supported by transcription-rate data","pmids":["9121427"],"is_preprint":false},{"year":1998,"finding":"ID3 selectively targets the E2A protein E47 in vivo, as demonstrated by a Gal4-VP16 two-hybrid competition assay; ID3 expression in K562 erythroid progenitors promotes erythroid differentiation correlated with a qualitative shift in TAL1/E-protein heterodimer binding profile at E-box sequences.","method":"Gal4-VP16 two-hybrid competition assay; E-box-dependent reporter assay; ectopic expression in K562 cells; electrophoretic mobility shift assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in-cell competition assay plus EMSA, single lab, consistent with E47-binding data from other studies","pmids":["9525934"],"is_preprint":false},{"year":1999,"finding":"Id3 knockout mice show compromised B-cell proliferative response to BCR cross-linking (but not to LPS), reduced humoral immunity, and defects in cytokine production and isotype switching. The proliferation defect is rescued by ectopic Id1 expression, demonstrating a specific, non-redundant role for ID3 in BCR-to-cell-cycle signaling.","method":"Gene knockout mouse; B-cell proliferation assay; rescue by ectopic Id1 expression; immunoglobulin quantification","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KO with defined proliferation phenotype, rescue experiment with paralog, multiple immunological readouts","pmids":["10454544"],"is_preprint":false},{"year":1999,"finding":"Id3 null mutant mice display defects in MHC class I- and class II-restricted thymocyte positive selection and impaired H-Y TCR-mediated negative selection. Genetic interaction between E2A and Id3 regulates thymocyte development, placing Id3 in the E2A pathway at the thymocyte selection checkpoint.","method":"Id3 knockout mouse; thymocyte selection assay; E2A/Id3 double-mutant epistasis","journal":"Immunity","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KO with defined developmental phenotype, genetic epistasis with E2A establishes pathway position","pmids":["10661402"],"is_preprint":false},{"year":1999,"finding":"Id1/Id3 double knockout mice exhibit premature withdrawal of neuroblasts from the cell cycle, expression of neural differentiation markers, vascular malformations in the forebrain, and failure to support tumor xenograft vascularization, demonstrating that Id1 and Id3 are required to maintain neuronal differentiation timing and endothelial cell invasiveness.","method":"Double gene knockout mouse; BrdU labeling; neural marker immunostaining; tumor xenograft assay","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — double KO with multiple orthogonal phenotypic readouts, replicated across three tumor types","pmids":["10537105"],"is_preprint":false},{"year":2000,"finding":"Ectopic expression of ID3 (and ID2) in CD34+ hematopoietic progenitors strongly inhibits development into CD123hi DC2 precursors but does not affect DC1 development, NK cell development, or T and B cell development (which are blocked at later stages), supporting a common lymphoid origin for DC2 precursors.","method":"Retroviral ectopic expression in CD34+ progenitors; fetal thymic organ culture; flow cytometry","journal":"The Journal of experimental medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gain-of-function in primary cells with defined lineage phenotype, single lab","pmids":["11120774"],"is_preprint":false},{"year":2001,"finding":"ID3 transcription is rapidly induced by TCR ligation in primary immature thymocytes, and this induction is regulated in a dose-dependent manner by the ERK MAPK module downstream of TCR signaling, directly connecting the Ras–ERK MAPK cascade to HLH protein activity and E2A DNA binding.","method":"Primary thymocyte stimulation; mRNA induction kinetics; ERK pathway inhibition; E2A DNA-binding assay","journal":"Nature immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — dose-dependent pharmacological pathway dissection with direct E2A binding readout, linear pathway established by epistasis","pmids":["11175815"],"is_preprint":false},{"year":2001,"finding":"ID3 is induced by TGF-β in B lymphocyte progenitors and mediates TGF-β-induced apoptosis and growth arrest; in the absence of ID3, the apoptotic/growth-arrest response of lymphocyte progenitors to TGF-β is perturbed, identifying E proteins (whose activity is antagonized by ID3) as critical for lymphocyte survival.","method":"Id3 knockout mouse; TGF-β stimulation; apoptosis and proliferation assays in lymphocyte progenitors","journal":"Nature immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KO with defined TGF-β response phenotype, mechanistic link to E-protein activity established","pmids":["11224524"],"is_preprint":false},{"year":2002,"finding":"ID3 is a novel redox-sensitive gene induced by superoxide (via angiotensin II or xanthine/xanthine oxidase) in vascular smooth muscle cells. ID3 promotes VSMC proliferation by downregulating p21WAF1/Cip1, p27Kip1, and p53, and causes retinoblastoma protein hyperphosphorylation; antisense ID3 abolishes Ang II–induced proliferation.","method":"Differential display; antisense and sense transfection; superoxide dismutase inhibition; Western blot for cell-cycle regulators; DNA synthesis/BrdU assay","journal":"Circulation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gain- and loss-of-function in VSMCs with downstream cell-cycle readouts, single lab","pmids":["12021231"],"is_preprint":false},{"year":2002,"finding":"GKLF (KLF4) binds to the Id3 promoter and transcriptionally represses Id3 expression, while Id3 reciprocally depresses expression of p21WAF1/Cip1, p27KIP1, and p53, establishing a GKLF–ID3 axis controlling redox-sensitive VSMC proliferation.","method":"Transfection with GKLF and antisense Id3; promoter binding analysis; gene expression assays; vascular injury mouse model","journal":"FASEB journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — promoter binding and gain/loss-of-function in cells plus in vivo vascular injury model, single lab","pmids":["12087069"],"is_preprint":false},{"year":2004,"finding":"TGF-β1 causes long-term repression of ID2 and ID3, while BMP-7 induces sustained ID2/ID3 expression. Ectopic ID3 expression renders epithelial cells refractory to TGF-β-induced growth inhibition and epithelial-mesenchymal transition (EMT), phenocopying the BMP response. Knockdown of ID3 sensitizes cells to BMP-induced growth inhibition and transdifferentiation.","method":"cDNA microarray; ectopic overexpression; siRNA knockdown; growth inhibition assay; EMT morphology assessment; Smad4-deficient cells","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal gain- and loss-of-function with multiple cell-biological readouts, pathway position established relative to Smad4","pmids":["15121845"],"is_preprint":false},{"year":2004,"finding":"ID3 has a T-cell intrinsic role in preventing autoimmune Sjögren's syndrome. Adoptive transfer of Id3-deficient T cells into wild-type recipients recapitulates disease symptoms (dry eyes/mouth, lymphocyte infiltration), and neonatal thymectomy or genetic T-cell ablation rescues disease in Id3 KO mice, indicating that abnormal T cells generated during thymic development drive the autoimmune phenotype.","method":"Id3 knockout mouse; adoptive transfer; neonatal thymectomy; T-cell ablation","journal":"Immunity","confidence":"High","confidence_rationale":"Tier 2 / Strong — adoptive transfer establishes T-cell intrinsic mechanism, multiple complementary genetic interventions","pmids":["15485632"],"is_preprint":false},{"year":2004,"finding":"ID3 (and ID1) undergo ubiquitin-dependent proteasomal degradation mediated by the COP9 signalosome (CSN). ID3 physically interacts with CSN subunits CSN5 and CSN7 (demonstrated by pull-down and far Western). Recombinant ID3 is not phosphorylated by CSN-associated kinases CK2 and PKD, but inhibits c-Jun and CSN2 phosphorylation by CK2. Inhibition of CSN-associated kinases by curcumin or emodin increases ID3 ubiquitination and degradation. Overexpression of CSN2 stabilizes ID3 protein.","method":"Mammalian two-hybrid; pull-down; far Western; in vitro kinase assay; co-transfection with His-ubiquitin; proteasome inhibitor treatment; His-pull-down for ubiquitin conjugates","journal":"Journal of molecular biology","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — multiple orthogonal biochemical methods (pull-down, far Western, in vitro kinase, ubiquitin co-transfection) in single study","pmids":["15451666"],"is_preprint":false},{"year":2004,"finding":"Latent membrane protein 1 (LMP1) of Epstein-Barr virus induces ID1 and ID3 expression via NF-κB and MAPK signaling; ID3 induction correlates with downregulation of p27Kip1, increased Cdk2 levels, and retinoblastoma protein hyperphosphorylation in LMP1-transformed cells.","method":"Genomic expression array; mRNA and protein validation; stable LMP1 expression in C33A and Rat-1 cells","journal":"Journal of virology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genomic screen confirmed by protein-level data, downstream cell-cycle pathway established, single lab","pmids":["15564458"],"is_preprint":false},{"year":2004,"finding":"E2A/HEB heterodimers bind an E-box element in the SRG3 promoter to activate its transcription, and ID3 (induced by TCR→MEK/ERK) represses SRG3 by blocking this E-box binding. Enforced ID3 expression confers glucocorticoid resistance in thymocytes; overexpression of SRG3 overcomes ID3-mediated glucocorticoid resistance.","method":"Promoter-reporter assay; electrophoretic mobility shift assay (EMSA); retroviral transduction of Id3; SRG3 overexpression rescue","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — EMSA plus promoter reporter plus rescue experiment, single lab","pmids":["15016815"],"is_preprint":false},{"year":2004,"finding":"Id3 is a direct transcriptional target of Pax7 in quiescent satellite cells; chromatin immunoprecipitation shows Pax7 binding upstream of the Id3 promoter in quiescent satellite cells, a conserved Pax7-binding site is required for maximal promoter activation, and shRNA knockdown of Pax7 coordinately reduces Id2 and Id3 expression.","method":"Chromatin immunoprecipitation (ChIP); luciferase reporter assay with mutagenesis of Pax7 binding site; shRNA knockdown; ectopic Pax7 expression","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — ChIP plus reporter mutagenesis plus loss-of-function, multiple orthogonal methods in single study","pmids":["19458195"],"is_preprint":false},{"year":2001,"finding":"Vascular injury induces expression of a novel ID3 isoform (Id3a/Id3L) generated by alternative splicing retaining a 115-bp coding intron that encodes a unique 29-amino acid C-terminus. Unlike canonical ID3, Id3a does not promote SMC growth but instead stimulates apoptosis and inhibits neointimal lesion formation in vivo.","method":"Yeast two-hybrid cloning from SMC library; RT-PCR; adenoviral overexpression in SMCs; balloon injury rat carotid model; DNA fragmentation assay","journal":"Arteriosclerosis, thrombosis, and vascular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo vascular injury model plus in vitro functional assays distinguishing isoforms, single lab","pmids":["11348870"],"is_preprint":false},{"year":2004,"finding":"The intron-retaining Id3a isoform fails to promote SMC S-phase entry or inhibit p21Cip1 transcription (unlike canonical Id3), but instead stimulates apoptosis and inhibits vascular lesion formation; adenoviral delivery of Id3a inhibits lesion formation in balloon-injured rat carotid arteries in vivo, defining a feedback loop via regulated intron retention.","method":"Adenoviral gene transfer; BrdU S-phase assay; p21 promoter reporter; in vivo balloon injury carotid model; Id3a-specific antibody","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo vascular model plus multiple in vitro functional assays, single lab","pmids":["15159391"],"is_preprint":false},{"year":2007,"finding":"Id3 regulates p27kip1 mRNA levels in early G1 phase through transcriptional repression via ELK1 inhibition. Id3 silencing prevents p27 mRNA downregulation, blocks G1 progression (inhibits pRb phosphorylation and p130 degradation), and inhibits G1/S transition (blocks cyclin A induction). ChIP confirms Id3-mediated repression through ELK1 at the p27 promoter.","method":"siRNA knockdown; quantitative RT-PCR; promoter-reporter assay; chromatin immunoprecipitation (ChIP); cell cycle analysis","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — ChIP plus promoter reporter plus loss-of-function with multiple cell-cycle readouts, single study","pmids":["17404577"],"is_preprint":false},{"year":2008,"finding":"ID3 inhibits E47-mediated and SREBP-1c-mediated adiponectin promoter activation in a dose-dependent manner by interacting with E47 and preventing its binding to a consensus E-box in the adiponectin promoter. ChIP demonstrates E47 binding to the endogenous adiponectin promoter in differentiating adipocytes, which is abolished by ID3 overexpression and enhanced in Id3-null adipose tissue.","method":"Luciferase promoter assay; chromatin immunoprecipitation (ChIP); Id3 knockout mouse; ectopic overexpression; E-box mutation","journal":"Circulation research","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — ChIP in vitro and in vivo, promoter reporter with E-box mutation, Id3 KO mouse, multiple orthogonal methods","pmids":["18669923"],"is_preprint":false},{"year":2009,"finding":"The ERK–Egr–Id3 pathway plays a defining role in αβ vs. γδ T lineage fate specification: Id3 is markedly induced by γδTCR signaling and is necessary and sufficient to enable γδ-lineage cells to differentiate independently of Notch signaling and become competent IFN-γ-producing effectors.","method":"Id3 knockout mouse; retroviral Id3 overexpression; Notch inhibition; cytokine production assay; ERK pathway analysis","journal":"Immunity","confidence":"High","confidence_rationale":"Tier 2 / Strong — both KO and ectopic expression with defined lineage-fate phenotype, epistasis with Notch pathway established","pmids":["19833086"],"is_preprint":false},{"year":2011,"finding":"Blimp-1 binds to and represses the Id3 promoter in short-lived effector CD8+ T cells (SLECs); repression of Id3 by Blimp-1 limits SLEC persistence as memory cells. Enforced Id3 expression restores SLEC survival and enhances recall responses. ID3 function in this context is mediated in part through inhibition of E2A transcriptional activity and induction of genes regulating genome stability.","method":"Chromatin immunoprecipitation; retroviral enforced expression of Id3; Id3 reporter mice; KLRG-1 memory cell analysis","journal":"Nature immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP establishes direct promoter binding, enforced expression rescue, replicated alongside parallel study (PMID:22057289)","pmids":["22057288"],"is_preprint":false},{"year":2011,"finding":"Id3hi precursors of long-lived CD8+ memory T cells are identifiable before the peak of T cell expansion using Id3 reporter mice. Deficiency in Id3 results in loss of distinct long-lived memory CD8+ T cell populations. Cytokines differentially regulate Id2 and Id3, linking external cues to gene expression programs controlling memory vs. effector fate.","method":"Id3 reporter knock-in mouse; Id3 knockout mouse; flow cytometry of memory populations; cytokine stimulation","journal":"Nature immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reporter KI and KO mice with defined T-cell memory phenotype, independently replicated alongside PMID:22057288","pmids":["22057289"],"is_preprint":false},{"year":2011,"finding":"E2A genome-wide occupancy is altered by pre-TCR-mediated signaling; Id3 expression is higher beyond the pre-TCR checkpoint and remains high in naive T cells. Id3-deficient mice show aberrant effector-memory T cell development, elevated CXCR5 and Bcl-6, and formation of T cell–B cell conjugates and B cell follicles, demonstrating that Id3 antagonizes E2A activity to enforce the naive T cell fate.","method":"Id3 knockout mouse; E2A ChIP-seq (genome-wide occupancy); flow cytometry; immunohistology","journal":"Nature immunology","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — genome-wide ChIP-seq plus KO mouse with defined phenotype, multiple readouts","pmids":["21857655"],"is_preprint":false},{"year":2012,"finding":"ID1 and ID3 together govern colon cancer-initiating cell (CC-IC) self-renewal through regulation of p21 (CDKN1A). ID1/ID3 regulation of p21 is a central mechanism preventing accumulation of excess DNA damage and functional exhaustion of CC-ICs. Silencing of ID1 and ID3 increases sensitivity to oxaliplatin.","method":"siRNA silencing; serial transplantation (CC-IC self-renewal assay); p21 expression analysis; oxaliplatin sensitivity assay","journal":"Cancer cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function with defined cancer stem cell phenotype, downstream p21 mechanism identified, single lab","pmids":["22698403"],"is_preprint":false},{"year":2012,"finding":"Burkitt lymphoma carries recurrent somatic mutations in ID3 (68% of cases), concentrated at somatic hypermutation motifs, and many are in regions that could impair ID3 protein function (mapped to focal homozygous loss region at 1p). These mutations are enriched in Burkitt lymphoma compared with other B-cell lymphomas with IG-MYC translocation, establishing ID3 inactivation as a hallmark cooperating event in Burkitt lymphomagenesis.","method":"Whole-genome sequencing; whole-exome sequencing; transcriptome sequencing; extended cohort mutation analysis","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — multi-platform sequencing with large cohort validation, independently confirmed in subsequent studies","pmids":["23143595"],"is_preprint":false},{"year":2012,"finding":"Loss of Id3 in B cells impairs their homing to the aorta and B-cell-mediated atheroprotection; the CCR6 chemokine receptor is identified as an Id3 target mediating aortic B-cell homing. Id3-null B cells transferred into B-cell-deficient mice fail to reconstitute aortic B cells and fail to protect against atherosclerosis.","method":"Id3 knockout in Apoe-/- mice; adoptive B-cell transfer; flow cytometry; atherosclerosis quantification; CCR6 expression analysis","journal":"Circulation research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — adoptive transfer establishes cell-intrinsic mechanism, CCR6 identified as target, single lab","pmids":["22034493"],"is_preprint":false},{"year":2012,"finding":"ID3 suppresses glioma stem cell invasiveness by inhibiting p27KIP1-RhoA-dependent migration and MMP3 expression; EGFR inhibition decreases ID3 levels, thereby promoting invasion via these downstream effectors.","method":"EGFR inhibition; ID3 knockdown; p27KIP1 and MMP3 expression analysis; invasion assay; xenograft and human GBM specimens","journal":"Cancer letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function plus mechanistic downstream readouts, single lab, supported by in vivo specimens","pmids":["23022473"],"is_preprint":false},{"year":2012,"finding":"Id3 loss in Ldlr-/- mice increases VCAM-1 expression in vascular smooth muscle cells and aortic tissue. ChIP demonstrates that E12 binds the VCAM-1 promoter in VSMCs, and this binding is inhibited by Id3 overexpression; Id3 deficiency increases macrophage accumulation and accelerates atherosclerosis.","method":"Id3 knockout in Ldlr-/- mice; ChIP; VCAM-1 promoter reporter; primary VSMC gain/loss-of-function; immunostaining","journal":"Arteriosclerosis, thrombosis, and vascular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus promoter reporter plus in vivo atherosclerosis model, single lab","pmids":["23042815"],"is_preprint":false},{"year":2014,"finding":"ID2 and ID3 expression in regulatory T cells is required to suppress fatal inflammatory disease; TCR-driven signaling decreases Id3 abundance to activate a follicular regulatory T (TFR) cell transcription signature, but sustained loss of Id2/Id3 impairs TFR cell development. Id2/Id3 depletion compromises Treg cell maintenance and localization.","method":"Conditional Id2/Id3 knockout in Treg cells; flow cytometry; transcriptional profiling; adoptive transfer","journal":"Nature immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO with defined Treg phenotype and TFR checkpoint, TCR-signaling mechanism identified","pmids":["24973820"],"is_preprint":false},{"year":2015,"finding":"TGF-β1 and IL-4 downregulate ID3 expression via the kinase TAK1; reduction in ID3 enhances binding of E2A and GATA-3 to the Il9 promoter to promote Il9 transcription and TH9 differentiation. Deletion of Id3 increases IL-9 production from CD4+ T cells, identifying a TAK1–Id3–E2A–GATA-3 pathway governing TH9 fate.","method":"Id3 knockout mouse; cytokine stimulation; TAK1 inhibition; chromatin immunoprecipitation (E2A/GATA-3 at Il9 promoter); IL-9 production assay; melanoma model","journal":"Nature immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP plus KO plus TAK1 epistasis plus in vivo tumor model, multiple orthogonal methods","pmids":["26322481"],"is_preprint":false},{"year":2015,"finding":"Id3 depletion in adult neural stem/precursor cells (NSPCs) reduces astrocyte generation after cortical brain injury. BMP-2 upregulates Id3 in the SVZ stem cell niche after injury; Id3-deficient NSPCs fail to differentiate into BMP-2-induced astrocytes, while E47-deficient NSPCs differentiate into astrocytes without BMP-2. E47 represses astrocyte-specific gene expression and Id3 antagonizes E47 to promote astrocyte differentiation.","method":"Id3 knockout mouse; E47 conditional knockout; cortical injury model; neurosphere culture; astrocyte differentiation assay; BMP-2 treatment","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal KO of Id3 and E47 with defined differentiation phenotype establishes pathway epistasis, in vivo injury model","pmids":["26438726"],"is_preprint":false},{"year":2016,"finding":"Id3 downregulation in B cells is essential for releasing E2A and E2-2 (redundantly required) for antigen-induced B cell differentiation into germinal center B cells and plasma cells; this pathway controls Blimp1, Xbp1, and CXCR4 expression and is critical for establishing the GC transcriptional network.","method":"Id3 knockout mouse; B-cell differentiation assay; flow cytometry; gene expression analysis; antibody titer measurement","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KO with multiple downstream transcription factor readouts and functional B-cell differentiation phenotypes","pmids":["27217539"],"is_preprint":false},{"year":2016,"finding":"In regulatory T cells, high Id3 expression restricts E47 activity to maintain Foxp3 transcription. Loss of Id3 or overexpression of E47 in Treg cells results in loss of Foxp3 expression; mechanistically, E47 activates Spi-B and SOCS3 expression, both of which downregulate Foxp3. Thus Id3–E47–Spi-B/SOCS3 is the pathway controlling Foxp3 stability.","method":"Id3-conditional KO; E47 retroviral overexpression; Foxp3 expression assay in vivo and in vitro; Spi-B and SOCS3 expression analysis","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO plus gain-of-function with downstream mechanistic readout, single lab","pmids":["27974197"],"is_preprint":false},{"year":2017,"finding":"In response to DNA double-strand breaks, ATM phosphorylates ID3 at serine 65 within the HLH motif. This phosphorylation enables a direct interaction between ID3 and MDC1. Depletion of ID3 impairs MDC1 foci formation, suppresses γ-H2AX-bound MDC1, impairs DSB repair, causes cellular hypersensitivity to ionizing radiation, and leads to genomic instability. Disruption of the MDC1–ID3 interaction prevents MDC1 accumulation at DSB sites.","method":"Co-immunoprecipitation; ATM kinase assay; phospho-specific mutant analysis; siRNA depletion; immunofluorescence foci assay; comet assay; clonogenic survival assay","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — multiple orthogonal methods (Co-IP, kinase assay, mutagenesis, foci assay, functional DNA repair) in single rigorous study","pmids":["29026069"],"is_preprint":false},{"year":2010,"finding":"BMP2 stimulates ID3 transcription via BMPR2 and BMPR1A (ALK3) receptors and intracellular SMAD1 and SMAD5 signaling. Two cis-regulatory elements mediate this induction: a novel 6-bp proximal element and a distal SMAD-responsive enhancer. The proximal element does not bind SMADs directly but binds a specific protein complex.","method":"Quantitative RT-PCR; promoter-reporter analysis; receptor and SMAD overexpression; RNA interference; cis-element mutagenesis","journal":"Molecular and cellular endocrinology","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — promoter dissection with mutagenesis plus gain/loss-of-function for receptors and SMADs, single lab","pmids":["21056086"],"is_preprint":false},{"year":2017,"finding":"ANGPTL4 binds to cadherin-11, releasing membrane-bound β-catenin, which translocates to the nucleus and transcriptionally upregulates ID3 expression in fibroblasts. ID3 then interacts with scleraxis (a bHLH transcription factor) to inhibit scar-associated collagen types 1α2 and 3α1 production.","method":"Co-immunoprecipitation; ANGPTL4/cadherin-11 binding assay; nuclear β-catenin fractionation; Id3 promoter reporter; Id3 siRNA; collagen expression assay","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus reporter assay plus loss-of-function with downstream collagen readout, single lab","pmids":["28740178"],"is_preprint":false},{"year":2018,"finding":"CD5L promotes M2 macrophage polarization by inducing ID3 expression through an autophagy-dependent pathway requiring ATG7. siRNA targeting ATG7 blocks CD5L-induced ID3 upregulation, and ID3 silencing reverses CD5L-mediated polarization, placing ID3 downstream of CD5L-induced autophagy in macrophage polarization.","method":"siRNA silencing of ATG7 and ID3; LC3-II content and colocalization assay; gene expression profiling; flow cytometry","journal":"Frontiers in immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA epistasis (ATG7→ID3→polarization) with multiple readouts, single lab","pmids":["29593730"],"is_preprint":false},{"year":2019,"finding":"ID3 interacts with E47 and blocks E47 recruitment to the β-catenin promoter, leading to activation of Wnt/β-catenin signaling and promotion of stemness in intrahepatic cholangiocarcinoma cells.","method":"Co-immunoprecipitation (ID3–E47); chromatin immunoprecipitation (E47 at β-catenin promoter); ID3 overexpression/knockdown; Wnt/β-catenin reporter; in vivo xenograft","journal":"Hepatology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus ChIP plus functional reporter in cancer cells, single lab","pmids":["30520117"],"is_preprint":false},{"year":2024,"finding":"ID3 is the lineage-determining factor for Kupffer cells that controls the macrophage inhibitory/activating receptor balance and confers anti-tumor phagocytic activity. Mechanistically, ID3 buffers binding of transcription factors ELK1 and E2A at the SIRPA (SIRPα) locus to reduce inhibitory receptor expression. Loss- and gain-of-function in both mouse bone-marrow-derived and human iPSC-derived macrophages confirm ID3 is sufficient to confer potent anti-tumor activity.","method":"Id3 loss-of-function and gain-of-function in macrophages; ChIP for ELK1 and E2A at SIRPA locus; phagocytosis assay of live tumor cells; NK/CD8 T cell recruitment assay; human iPSC-derived macrophage experiments","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — ChIP establishes molecular mechanism at SIRPA locus, reciprocal loss/gain-of-function in mouse and human macrophages, multiple functional readouts","pmids":["38326607"],"is_preprint":false},{"year":2025,"finding":"ID3 expression identifies a common progenitor of stem-like memory and precursors of exhausted CD8+ T cells (Tpex). ID3 expression itself is required for Tpex cell maintenance during chronic infection and cancer; loss of ID3 results in impaired CD8 T cell immunity. IL-1 family members (IL-36β and IL-18) promote generation of ID3+ stem-like T cells with superior tumor control.","method":"Id3 knockout mouse; Id3 reporter; adoptive transfer; chronic infection models; tumor models; cytokine stimulation","journal":"Science immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — KO plus reporter plus adoptive transfer in multiple disease models, IL-1 cytokine epistasis established","pmids":["39888981"],"is_preprint":false}],"current_model":"ID3 is a dominant-negative HLH protein that lacks a DNA-binding basic region and functions primarily by heterodimerizing with E-protein transcription factors (E12, E47, E2-2, HEB) to prevent their binding to E-box sequences and block bHLH-dependent transcription; its activity is cell-cycle regulated by Cdk2-dependent phosphorylation at Ser5, it is degraded via the COP9 signalosome–ubiquitin–proteasome pathway, it is induced downstream of Ras–ERK MAPK and TGF-β/BMP–SMAD signaling (and directly by Pax7, Wnt/β-catenin, and BMP2 at defined promoter elements), and in response to DNA double-strand breaks ATM phosphorylates ID3 at Ser65 to enable direct interaction with MDC1 and facilitate DNA damage repair; through these mechanisms ID3 controls cell cycle progression (repressing p21 and p27 transcription, promoting Rb phosphorylation), opposes E-protein-driven differentiation programs across multiple lineages (lymphocytes, muscle, adipocytes, neural cells, endothelium), maintains stemness and memory potential in T cells, governs macrophage anti-tumor activity by buffering ELK1/E2A occupancy at the SIRPA locus, and is recurrently inactivated by somatic mutation in Burkitt lymphoma."},"narrative":{"mechanistic_narrative":"ID3 is a dominant-negative helix-loop-helix (HLH) protein that controls the balance between proliferation and differentiation across many lineages by sequestering E-protein transcription factors and blocking their binding to E-box DNA elements [PMID:8139914, PMID:8759016]. Lacking its own basic DNA-binding region, ID3 forms heterodimers with bHLH proteins including E12, E47, E2-2 and MyoD, preferentially targeting E2A-class factors and inhibiting both their DNA binding and transcriptional activity [PMID:8139914, PMID:8759016, PMID:9525934]. Through this antagonism ID3 drives cell-cycle progression and represses differentiation: it promotes S-phase entry, opposes muscle, adipocyte and erythroid differentiation programs [PMID:8853902, PMID:9121427, PMID:9525934], and transcriptionally represses the CDK inhibitors p21 and p27 — the latter through inhibition of ELK1 at the p27 promoter — thereby promoting Rb hyperphosphorylation [PMID:12021231, PMID:17404577]. ID3 activity is gated by signaling and post-translational control: cyclin E/A–Cdk2 phosphorylates ID3 at Ser5 to nullify its G1 function and shift its bHLH target specificity [PMID:9372912], and ID3 is turned over by ubiquitin-dependent proteasomal degradation involving the COP9 signalosome subunits CSN5/CSN7 [PMID:15451666]. ID3 transcription is induced by Ras–ERK MAPK signaling downstream of antigen receptors [PMID:11175815], by TGF-β and BMP–SMAD signaling [PMID:11224524, PMID:15121845, PMID:21056086], and directly by Pax7, Wnt/β-catenin and BMP2 at defined promoter elements [PMID:19458195, PMID:21056086, PMID:30520117]. In the immune system ID3 enforces naive, memory and regulatory T-cell fates by restraining E2A/E2-2 activity, governing thymocyte selection, αβ/γδ lineage choice, Treg Foxp3 maintenance, germinal-center B-cell differentiation and stem-like memory CD8 T-cell programs [PMID:10661402, PMID:19833086, PMID:21857655, PMID:24973820, PMID:27217539, PMID:39888981]. Beyond transcription, ATM phosphorylates ID3 at Ser65 following DNA double-strand breaks to enable direct interaction with MDC1, promoting MDC1 foci formation and double-strand-break repair [PMID:29026069]. ID3 also determines Kupffer-cell anti-tumor phagocytic activity by buffering ELK1 and E2A occupancy at the SIRPA locus [PMID:38326607], and is recurrently inactivated by somatic mutation in Burkitt lymphoma, establishing it as a tumor suppressor in that disease [PMID:23143595].","teleology":[{"year":1994,"claim":"Established the fundamental biochemical mechanism: how a protein lacking a DNA-binding domain could regulate transcription, by showing ID3 acts as a dominant-negative dimerization partner.","evidence":"In vitro DNA-binding inhibition and heterodimer formation assays with E47 and MyoD","pmids":["8139914"],"confidence":"High","gaps":["Did not define which E-proteins are physiologically targeted in vivo","No structural basis for dimerization specificity"]},{"year":1996,"claim":"Defined ID3's interaction partner repertoire and target preference, showing it selectively engages E2A-class factors over c-Myc and that both HLH and C-terminal domains are required for dominant-negative differentiation block.","evidence":"Yeast two-hybrid, co-immunoprecipitation, reporter assays, and domain mutagenesis in muscle cells","pmids":["8759016","8853903","8853902"],"confidence":"High","gaps":["C-terminal domain mechanism not molecularly defined","In vitro target preference not validated genome-wide"]},{"year":1997,"claim":"Resolved how ID3 activity is temporally controlled within the cell cycle by identifying Cdk2 phosphorylation at Ser5 as a switch that nullifies its G1 function and alters bHLH target specificity.","evidence":"In vitro kinase assays, Ser5→Asp/Ala mutagenesis, E-box reporter and S-phase entry assays","pmids":["9372912"],"confidence":"High","gaps":["In vivo kinetics of phosphorylation cycling not established","How phosphorylation alters target selectivity mechanistically unresolved"]},{"year":1997,"claim":"Generalized the anti-differentiation role beyond muscle, showing ID3 blocks adipogenesis and is transcriptionally downregulated during differentiation.","evidence":"Stable ID3 overexpression and transcription-rate analysis in preadipocytes","pmids":["9121427"],"confidence":"Medium","gaps":["E-protein target in adipogenesis not yet identified (later resolved as E47/adiponectin)"]},{"year":1999,"claim":"Genetic knockouts established ID3's non-redundant, lineage-specific roles in lymphocyte signaling, thymocyte selection, and neural/endothelial development, placing it in the E2A pathway in vivo.","evidence":"Id3 single and Id1/Id3 double knockout mice with proliferation, selection, neural marker and xenograft vascularization assays","pmids":["10454544","10661402","10537105"],"confidence":"High","gaps":["Functional redundancy among Id family members complicates single-gene interpretation","Direct E2A target genes downstream not yet mapped"]},{"year":2001,"claim":"Connected upstream signaling to ID3, showing Ras–ERK MAPK downstream of TCR and TGF-β control ID3 transcription, linking extracellular cues to E-protein activity.","evidence":"Primary thymocyte stimulation with ERK inhibition; TGF-β stimulation in knockout B-cell progenitors","pmids":["11175815","11224524"],"confidence":"High","gaps":["Transcription factors directly driving ID3 induction not pinpointed in these studies"]},{"year":2001,"claim":"Revealed isoform-level functional diversification: an intron-retaining Id3a isoform with a distinct C-terminus that is pro-apoptotic rather than pro-proliferative in vascular smooth muscle.","evidence":"RT-PCR cloning, adenoviral overexpression, and balloon-injury carotid model","pmids":["11348870","15159391"],"confidence":"Medium","gaps":["Regulation of the splicing switch not defined","Human relevance of the isoform unclear"]},{"year":2002,"claim":"Established the downstream cell-cycle output of ID3 in vascular cells, repressing p21, p27 and p53 and driving Rb hyperphosphorylation, with KLF4 identified as an upstream repressor.","evidence":"Antisense/sense transfection, Western blotting for cell-cycle regulators, and promoter binding analysis in VSMCs","pmids":["12021231","12087069"],"confidence":"Medium","gaps":["Whether p21/p27 repression is direct or E-protein-mediated not resolved here","Single lab"]},{"year":2004,"claim":"Defined ID3 protein turnover, showing COP9 signalosome–dependent ubiquitin-proteasome degradation via CSN5/CSN7 interaction, providing a post-translational layer of regulation.","evidence":"Mammalian two-hybrid, pull-down, far Western, in vitro kinase and ubiquitin co-transfection assays","pmids":["15451666"],"confidence":"High","gaps":["E3 ligase mediating ID3 ubiquitination not identified","Physiological signals triggering degradation unclear"]},{"year":2004,"claim":"Positioned ID3 as a TGF-β/BMP signaling node controlling EMT and growth inhibition, and resolved direct E-box target mechanisms at the SRG3 promoter underlying glucocorticoid sensitivity.","evidence":"cDNA microarray, reciprocal overexpression/knockdown, EMSA and promoter reporters in epithelial cells and thymocytes","pmids":["15121845","15016815"],"confidence":"High","gaps":["Promoter-specific selectivity of E-protein targeting not generalized","EMT effector genes downstream not mapped"]},{"year":2004,"claim":"Extended ID3's role to autoimmunity and viral oncogenesis, showing a T-cell-intrinsic protective function against Sjögren-like disease and EBV-LMP1 induction of ID3.","evidence":"Adoptive transfer and thymectomy in Id3 knockout mice; expression arrays in LMP1-transformed cells","pmids":["15485632","15564458"],"confidence":"High","gaps":["Identity of the autoreactive T-cell-driving E-protein target unresolved","LMP1→ID3 functional consequence inferred from correlation"]},{"year":2007,"claim":"Defined the direct transcriptional mechanism of cell-cycle control, showing ID3 represses p27 via inhibition of ELK1 at the p27 promoter to drive G1/S progression.","evidence":"siRNA knockdown, qRT-PCR, promoter reporter, ChIP and cell-cycle analysis","pmids":["17404577"],"confidence":"High","gaps":["How ID3 inhibits ELK1 mechanistically (direct binding vs. indirect) not fully resolved"]},{"year":2008,"claim":"Provided definitive in vivo and in vitro evidence for the E-box displacement mechanism in adipogenesis, showing ID3 blocks E47 binding to the adiponectin promoter.","evidence":"ChIP in differentiating adipocytes and Id3-null tissue, promoter reporter with E-box mutation","pmids":["18669923"],"confidence":"High","gaps":["Metabolic phenotype of altered adiponectin in vivo not fully characterized"]},{"year":2009,"claim":"Established ID3 as a determinant of T-lineage fate, being induced by ERK–Egr signaling and necessary and sufficient for γδ effector differentiation independent of Notch.","evidence":"Id3 knockout and retroviral overexpression with Notch inhibition and cytokine assays","pmids":["19833086"],"confidence":"High","gaps":["E-protein targets specifying γδ effector program not detailed"]},{"year":2010,"claim":"Dissected the BMP2→SMAD transcriptional control of ID3, identifying distinct proximal and distal cis-regulatory elements.","evidence":"Promoter-reporter dissection with mutagenesis, receptor and SMAD overexpression and RNAi","pmids":["21056086"],"confidence":"Medium","gaps":["Identity of the protein complex binding the novel proximal element not determined"]},{"year":2011,"claim":"Identified ID3 as a master regulator of CD8 T-cell memory versus effector fate, repressed by Blimp-1 in short-lived effectors and marking long-lived memory precursors.","evidence":"ChIP, retroviral enforced expression, and Id3 reporter/knockout mice with memory population analysis","pmids":["22057288","22057289","21857655"],"confidence":"High","gaps":["Downstream genome-stability genes mediating memory persistence only partially defined"]},{"year":2012,"claim":"Established ID3 as a context-dependent cancer regulator: a self-renewal/genome-protection factor in colon and glioma stem cells, and a recurrently inactivated tumor suppressor in Burkitt lymphoma.","evidence":"siRNA silencing with serial transplantation and invasion assays; whole-genome/exome sequencing of Burkitt lymphoma cohorts","pmids":["22698403","23022473","23143595"],"confidence":"High","gaps":["Opposing oncogenic vs. tumor-suppressive roles across tissues not mechanistically reconciled","Functional impact of specific Burkitt mutations on E-protein binding not assayed"]},{"year":2012,"claim":"Extended ID3's vascular role to atheroprotection, governing B-cell aortic homing via CCR6 and VSMC VCAM-1 expression via E12 antagonism.","evidence":"Id3 knockout in Apoe-/- and Ldlr-/- mice, adoptive transfer, ChIP and atherosclerosis quantification","pmids":["22034493","23042815"],"confidence":"Medium","gaps":["Mechanism linking ID3 to CCR6 transcription not fully defined","Single lab"]},{"year":2014,"claim":"Defined ID2/ID3 as required for regulatory and follicular regulatory T-cell homeostasis, with TCR signaling lowering ID3 to enable the TFR program.","evidence":"Conditional Id2/Id3 knockout in Treg cells with transcriptional profiling and adoptive transfer","pmids":["24973820"],"confidence":"High","gaps":["Quantitative threshold of ID3 dosage governing the switch not defined"]},{"year":2015,"claim":"Resolved how cytokine signaling tunes ID3 to control TH9 differentiation, identifying a TAK1–Id3–E2A/GATA-3 axis at the Il9 promoter.","evidence":"Id3 knockout, TAK1 inhibition, ChIP at Il9 promoter and IL-9 production in a melanoma model","pmids":["26322481"],"confidence":"High","gaps":["Direct E2A/GATA-3 cooperation mechanism at Il9 not fully resolved"]},{"year":2015,"claim":"Established reciprocal ID3–E47 control of neural stem cell astrocyte differentiation downstream of BMP-2 injury signaling.","evidence":"Reciprocal Id3 and E47 knockout in NSPCs with cortical injury and differentiation assays","pmids":["26438726"],"confidence":"High","gaps":["Astrocyte-specific genes repressed by E47 not enumerated"]},{"year":2016,"claim":"Defined the requirement for ID3 downregulation to release E2A/E2-2 for germinal-center B-cell and plasma-cell differentiation, and ID3 maintenance of Treg Foxp3 stability via E47–Spi-B/SOCS3.","evidence":"Id3 knockout B-cell differentiation assays; conditional Id3 KO and E47 overexpression in Treg cells","pmids":["27217539","27974197"],"confidence":"High","gaps":["Redundancy of E2A and E2-2 not quantitatively partitioned","Treg Foxp3 mechanism single lab"]},{"year":2017,"claim":"Uncovered a transcription-independent function: ATM-phosphorylated ID3 (Ser65) directly binds MDC1 to promote DNA double-strand-break repair, expanding ID3 biology beyond E-protein antagonism.","evidence":"Co-IP, ATM kinase assay, phospho-mutant analysis, MDC1 foci imaging, comet and clonogenic survival assays","pmids":["29026069"],"confidence":"High","gaps":["How ID3 mechanistically stabilizes MDC1 at breaks unresolved","Relationship to ID3 transcriptional roles unclear"]},{"year":2017,"claim":"Linked Wnt/β-catenin and ANGPTL4 signaling to ID3 induction, with ID3 then engaging scleraxis to limit fibrotic collagen production.","evidence":"Co-IP, nuclear β-catenin fractionation, Id3 reporter, siRNA and collagen assays in fibroblasts","pmids":["28740178"],"confidence":"Medium","gaps":["Direct ID3–scleraxis structural interaction not characterized","Single lab"]},{"year":2018,"claim":"Placed ID3 downstream of CD5L-induced autophagy in M2 macrophage polarization.","evidence":"siRNA epistasis (ATG7→ID3→polarization) with LC3-II and flow cytometry readouts","pmids":["29593730"],"confidence":"Medium","gaps":["Mechanism by which autophagy induces ID3 transcription unknown","Single lab"]},{"year":2019,"claim":"Showed ID3 promotes cancer stemness by blocking E47 recruitment to the β-catenin promoter, activating Wnt signaling in cholangiocarcinoma.","evidence":"Co-IP, ChIP, ID3 overexpression/knockdown, Wnt reporter and xenograft","pmids":["30520117"],"confidence":"Medium","gaps":["Reciprocity with prior β-catenin→ID3 induction model not reconciled","Single lab"]},{"year":2024,"claim":"Established ID3 as the Kupffer-cell lineage-determining factor controlling macrophage anti-tumor activity by buffering ELK1/E2A occupancy at the SIRPA locus.","evidence":"Reciprocal loss/gain-of-function in mouse and human iPSC-derived macrophages, ChIP at SIRPA, and phagocytosis assays","pmids":["38326607"],"confidence":"High","gaps":["How ID3 dosage sets the inhibitory/activating receptor balance quantitatively unresolved"]},{"year":2025,"claim":"Defined ID3 as a marker and requirement of stem-like/Tpex CD8 T-cell progenitors essential for durable anti-tumor and anti-chronic-infection immunity, inducible by IL-1 family cytokines.","evidence":"Id3 knockout and reporter mice, adoptive transfer in chronic infection and tumor models, cytokine stimulation","pmids":["39888981"],"confidence":"High","gaps":["Transcriptional targets of ID3 sustaining the Tpex state not enumerated"]},{"year":null,"claim":"How ID3's transcription-independent DNA-repair role integrates with its dominant E-protein-antagonist function, and what reconciles its opposing oncogenic versus tumor-suppressive roles across tissues, remain open.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model of ID3–MDC1 versus ID3–E-protein interaction surfaces","E3 ligase and full degradation machinery undefined","Context-determinants of oncogenic vs. tumor-suppressive function unresolved"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,1,6,23,24,28,44]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,1,4,24,39,43]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,1,39]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[24,28,39]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[1,6,23,24,28,44]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[3,4,13,23]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[7,8,25,26,27,34,35,37,44,45]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[11,12,15,40,43]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[39]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[9,20,25,36]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[30,32,43]}],"complexes":[],"partners":["E47","E2A","E12","E2-2","MYOD","MDC1","ELK1","CSN5"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q02535","full_name":"DNA-binding protein inhibitor ID-3","aliases":["Class B basic helix-loop-helix protein 25","bHLHb25","Helix-loop-helix protein HEIR-1","ID-like protein inhibitor HLH 1R21","Inhibitor of DNA binding 3","Inhibitor of differentiation 3"],"length_aa":119,"mass_kda":13.0,"function":"Transcriptional regulator (lacking a basic DNA binding domain) which negatively regulates the basic helix-loop-helix (bHLH) transcription factors by forming heterodimers and inhibiting their DNA binding and transcriptional activity. Implicated in regulating a variety of cellular processes, including cellular growth, senescence, differentiation, apoptosis, angiogenesis, and neoplastic transformation. Involved in myogenesis by inhibiting skeletal muscle and cardiac myocyte differentiation and promoting muscle precursor cells proliferation. Inhibits the binding of E2A-containing protein complexes to muscle creatine kinase E-box enhancer. Regulates the circadian clock by repressing the transcriptional activator activity of the CLOCK-BMAL1 heterodimer","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/Q02535/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/ID3","classification":"Not Classified","n_dependent_lines":16,"n_total_lines":1208,"dependency_fraction":0.013245033112582781},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/ID3","total_profiled":1310},"omim":[{"mim_id":"620305","title":"NEUROOCULORENAL SYNDROME; NORS","url":"https://www.omim.org/entry/620305"},{"mim_id":"617621","title":"PAX3- AND PAX7-BINDING PROTEIN 1; PAXBP1","url":"https://www.omim.org/entry/617621"},{"mim_id":"608433","title":"ZINC FINGER- AND BTB DOMAIN-CONTAINING PROTEIN 18; ZBTB18","url":"https://www.omim.org/entry/608433"},{"mim_id":"607305","title":"MDS2 GENE","url":"https://www.omim.org/entry/607305"},{"mim_id":"602900","title":"DNA METHYLTRANSFERASE 3B; DNMT3B","url":"https://www.omim.org/entry/602900"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"blood vessel","ntpm":460.8}],"url":"https://www.proteinatlas.org/search/ID3"},"hgnc":{"alias_symbol":["HEIR-1","bHLHb25"],"prev_symbol":[]},"alphafold":{"accession":"Q02535","domains":[{"cath_id":"4.10.280.10","chopping":"41-87","consensus_level":"medium","plddt":87.0706,"start":41,"end":87}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q02535","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q02535-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q02535-F1-predicted_aligned_error_v6.png","plddt_mean":67.94},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=ID3","jax_strain_url":"https://www.jax.org/strain/search?query=ID3"},"sequence":{"accession":"Q02535","fasta_url":"https://rest.uniprot.org/uniprotkb/Q02535.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q02535/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q02535"}},"corpus_meta":[{"pmid":"10537105","id":"PMC_10537105","title":"Id1 and Id3 are required for neurogenesis, angiogenesis and vascularization of tumour xenografts.","date":"1999","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/10537105","citation_count":757,"is_preprint":false},{"pmid":"22057289","id":"PMC_22057289","title":"The transcriptional regulators Id2 and Id3 control the formation of distinct memory CD8+ T cell subsets.","date":"2011","source":"Nature immunology","url":"https://pubmed.ncbi.nlm.nih.gov/22057289","citation_count":350,"is_preprint":false},{"pmid":"23143595","id":"PMC_23143595","title":"Recurrent mutation of the ID3 gene in Burkitt lymphoma identified by integrated genome, exome and transcriptome sequencing.","date":"2012","source":"Nature genetics","url":"https://pubmed.ncbi.nlm.nih.gov/23143595","citation_count":340,"is_preprint":false},{"pmid":"15121845","id":"PMC_15121845","title":"Id2 and Id3 define the potency of cell proliferation and differentiation responses to transforming growth factor beta and bone morphogenetic protein.","date":"2004","source":"Molecular and cellular biology","url":"https://pubmed.ncbi.nlm.nih.gov/15121845","citation_count":300,"is_preprint":false},{"pmid":"8139914","id":"PMC_8139914","title":"The expression pattern of Id4, a novel dominant negative helix-loop-helix protein, is distinct from Id1, Id2 and Id3.","date":"1994","source":"Nucleic acids research","url":"https://pubmed.ncbi.nlm.nih.gov/8139914","citation_count":254,"is_preprint":false},{"pmid":"11120774","id":"PMC_11120774","title":"Id2 and Id3 inhibit development of CD34(+) stem cells into predendritic cell (pre-DC)2 but not into pre-DC1. Evidence for a lymphoid origin of pre-DC2.","date":"2000","source":"The Journal of experimental medicine","url":"https://pubmed.ncbi.nlm.nih.gov/11120774","citation_count":228,"is_preprint":false},{"pmid":"11175815","id":"PMC_11175815","title":"Regulation of the helix-loop-helix proteins, E2A and Id3, by the Ras-ERK MAPK cascade.","date":"2001","source":"Nature immunology","url":"https://pubmed.ncbi.nlm.nih.gov/11175815","citation_count":221,"is_preprint":false},{"pmid":"22698403","id":"PMC_22698403","title":"ID1 and ID3 regulate the self-renewal capacity of human colon cancer-initiating cells through p21.","date":"2012","source":"Cancer cell","url":"https://pubmed.ncbi.nlm.nih.gov/22698403","citation_count":187,"is_preprint":false},{"pmid":"10661402","id":"PMC_10661402","title":"Thymocyte selection is regulated by the helix-loop-helix inhibitor protein, Id3.","date":"2000","source":"Immunity","url":"https://pubmed.ncbi.nlm.nih.gov/10661402","citation_count":173,"is_preprint":false},{"pmid":"8922523","id":"PMC_8922523","title":"Expression patterns of Id1, Id2, and Id3 are highly related but distinct from that of Id4 during mouse embryogenesis.","date":"1996","source":"Developmental dynamics : an official publication of the American Association of Anatomists","url":"https://pubmed.ncbi.nlm.nih.gov/8922523","citation_count":164,"is_preprint":false},{"pmid":"22057288","id":"PMC_22057288","title":"Repression of the DNA-binding inhibitor Id3 by Blimp-1 limits the formation of memory CD8+ T cells.","date":"2011","source":"Nature immunology","url":"https://pubmed.ncbi.nlm.nih.gov/22057288","citation_count":164,"is_preprint":false},{"pmid":"10454544","id":"PMC_10454544","title":"Impaired immune responses and B-cell proliferation in mice lacking the Id3 gene.","date":"1999","source":"Molecular and cellular 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protein contains a HLH dimerization domain but lacks a basic DNA-binding region; it forms heterodimers with bHLH proteins (E47 homodimers and E47/MyoD heterodimers) and inhibits their DNA-binding activity, functioning as a dominant-negative HLH protein.\",\n      \"method\": \"In vitro DNA-binding inhibition assay; heterodimer formation assay\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct in vitro DNA-binding inhibition assay with domain characterization, replicated across multiple Id family studies\",\n      \"pmids\": [\"8139914\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"ID3 interacts with E12, E47, ALF1, and Id4 (all HLH proteins) as identified by yeast two-hybrid and confirmed by co-immunoprecipitation; ID3 disrupts DNA binding by these proteins in vitro and blocks transcriptional activation in cultured cells. ID3 preferentially targets E2A-class transcription factors and shows evidence of interacting with E2-2 and MyoD but not c-Myc.\",\n      \"method\": \"Yeast two-hybrid screen; co-immunoprecipitation; in vitro DNA-binding disruption assay; transcriptional reporter assay in cultured cells\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — multiple orthogonal methods (Y2H, Co-IP, in vitro binding, reporter assay) in single study, consistent with broader literature\",\n      \"pmids\": [\"8759016\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"Stable overexpression of ID3 inhibits differentiation of Sol 8 muscle cells, and both the HLH and C-terminal domains of ID3 are necessary and sufficient for this dominant-negative activity. Overexpression reduces DNA-binding activity in nuclear extracts.\",\n      \"method\": \"Stable transfection; domain mutagenesis; nuclear extract DNA-binding assay; in situ hybridization\",\n      \"journal\": \"Cell growth & differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — domain mutagenesis plus functional assay in single lab, consistent with parallel study (PMID:8853902)\",\n      \"pmids\": [\"8853903\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"Ectopic ID3 expression in C2C12 myoblasts impairs differentiation and promotes S-phase entry; antisense blockade of ID3 potentiates differentiation and cell cycle exit, establishing ID3 as a negative regulator of differentiation that integrates mitogenic signaling into cell cycle progression.\",\n      \"method\": \"Stable and inducible transfection; antisense knockdown; cell cycle analysis\",\n      \"journal\": \"Cell growth & differentiation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain- and loss-of-function with defined phenotype, single lab, two complementary approaches\",\n      \"pmids\": [\"8853902\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"Cyclin E–Cdk2 and cyclin A–Cdk2 phosphorylate ID3 at a conserved serine residue (Ser5) during late G1-to-S phase transition. A phosphomimetic ID3 Asp5 mutant cannot promote S-phase entry and loses ability to abrogate E-box-dependent bHLH complex formation in vitro and in vivo, whereas a non-phosphorylatable Ala5 mutant has enhanced activity. Cdk2 phosphorylation thus acts as a switch that nullifies ID3's G1 cell-cycle function and modulates its bHLH target specificity.\",\n      \"method\": \"In vitro kinase assay; site-directed mutagenesis (Ser5→Asp5 and Ser5→Ala5); E-box reporter assay; cell cycle S-phase entry assay in transfected fibroblasts\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — reconstituted in vitro phosphorylation, mutagenesis with functional validation in vivo, multiple orthogonal readouts in single study\",\n      \"pmids\": [\"9372912\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"ID3 prevents adipose differentiation of 3T3-F442A preadipose cells; stably transformed cells expressing ID3 under a viral promoter are virtually unable to differentiate, and ID3 mRNA is actively transcribed in preadipose cells but shows reduced transcription during adipogenesis.\",\n      \"method\": \"Stable transfection with constitutive ID3 expression; transcription rate analysis; differentiation assay\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — stable gain-of-function with defined differentiation phenotype, supported by transcription-rate data\",\n      \"pmids\": [\"9121427\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"ID3 selectively targets the E2A protein E47 in vivo, as demonstrated by a Gal4-VP16 two-hybrid competition assay; ID3 expression in K562 erythroid progenitors promotes erythroid differentiation correlated with a qualitative shift in TAL1/E-protein heterodimer binding profile at E-box sequences.\",\n      \"method\": \"Gal4-VP16 two-hybrid competition assay; E-box-dependent reporter assay; ectopic expression in K562 cells; electrophoretic mobility shift assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in-cell competition assay plus EMSA, single lab, consistent with E47-binding data from other studies\",\n      \"pmids\": [\"9525934\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Id3 knockout mice show compromised B-cell proliferative response to BCR cross-linking (but not to LPS), reduced humoral immunity, and defects in cytokine production and isotype switching. The proliferation defect is rescued by ectopic Id1 expression, demonstrating a specific, non-redundant role for ID3 in BCR-to-cell-cycle signaling.\",\n      \"method\": \"Gene knockout mouse; B-cell proliferation assay; rescue by ectopic Id1 expression; immunoglobulin quantification\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KO with defined proliferation phenotype, rescue experiment with paralog, multiple immunological readouts\",\n      \"pmids\": [\"10454544\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Id3 null mutant mice display defects in MHC class I- and class II-restricted thymocyte positive selection and impaired H-Y TCR-mediated negative selection. Genetic interaction between E2A and Id3 regulates thymocyte development, placing Id3 in the E2A pathway at the thymocyte selection checkpoint.\",\n      \"method\": \"Id3 knockout mouse; thymocyte selection assay; E2A/Id3 double-mutant epistasis\",\n      \"journal\": \"Immunity\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KO with defined developmental phenotype, genetic epistasis with E2A establishes pathway position\",\n      \"pmids\": [\"10661402\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Id1/Id3 double knockout mice exhibit premature withdrawal of neuroblasts from the cell cycle, expression of neural differentiation markers, vascular malformations in the forebrain, and failure to support tumor xenograft vascularization, demonstrating that Id1 and Id3 are required to maintain neuronal differentiation timing and endothelial cell invasiveness.\",\n      \"method\": \"Double gene knockout mouse; BrdU labeling; neural marker immunostaining; tumor xenograft assay\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — double KO with multiple orthogonal phenotypic readouts, replicated across three tumor types\",\n      \"pmids\": [\"10537105\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Ectopic expression of ID3 (and ID2) in CD34+ hematopoietic progenitors strongly inhibits development into CD123hi DC2 precursors but does not affect DC1 development, NK cell development, or T and B cell development (which are blocked at later stages), supporting a common lymphoid origin for DC2 precursors.\",\n      \"method\": \"Retroviral ectopic expression in CD34+ progenitors; fetal thymic organ culture; flow cytometry\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain-of-function in primary cells with defined lineage phenotype, single lab\",\n      \"pmids\": [\"11120774\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"ID3 transcription is rapidly induced by TCR ligation in primary immature thymocytes, and this induction is regulated in a dose-dependent manner by the ERK MAPK module downstream of TCR signaling, directly connecting the Ras–ERK MAPK cascade to HLH protein activity and E2A DNA binding.\",\n      \"method\": \"Primary thymocyte stimulation; mRNA induction kinetics; ERK pathway inhibition; E2A DNA-binding assay\",\n      \"journal\": \"Nature immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — dose-dependent pharmacological pathway dissection with direct E2A binding readout, linear pathway established by epistasis\",\n      \"pmids\": [\"11175815\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"ID3 is induced by TGF-β in B lymphocyte progenitors and mediates TGF-β-induced apoptosis and growth arrest; in the absence of ID3, the apoptotic/growth-arrest response of lymphocyte progenitors to TGF-β is perturbed, identifying E proteins (whose activity is antagonized by ID3) as critical for lymphocyte survival.\",\n      \"method\": \"Id3 knockout mouse; TGF-β stimulation; apoptosis and proliferation assays in lymphocyte progenitors\",\n      \"journal\": \"Nature immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KO with defined TGF-β response phenotype, mechanistic link to E-protein activity established\",\n      \"pmids\": [\"11224524\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"ID3 is a novel redox-sensitive gene induced by superoxide (via angiotensin II or xanthine/xanthine oxidase) in vascular smooth muscle cells. ID3 promotes VSMC proliferation by downregulating p21WAF1/Cip1, p27Kip1, and p53, and causes retinoblastoma protein hyperphosphorylation; antisense ID3 abolishes Ang II–induced proliferation.\",\n      \"method\": \"Differential display; antisense and sense transfection; superoxide dismutase inhibition; Western blot for cell-cycle regulators; DNA synthesis/BrdU assay\",\n      \"journal\": \"Circulation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain- and loss-of-function in VSMCs with downstream cell-cycle readouts, single lab\",\n      \"pmids\": [\"12021231\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"GKLF (KLF4) binds to the Id3 promoter and transcriptionally represses Id3 expression, while Id3 reciprocally depresses expression of p21WAF1/Cip1, p27KIP1, and p53, establishing a GKLF–ID3 axis controlling redox-sensitive VSMC proliferation.\",\n      \"method\": \"Transfection with GKLF and antisense Id3; promoter binding analysis; gene expression assays; vascular injury mouse model\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — promoter binding and gain/loss-of-function in cells plus in vivo vascular injury model, single lab\",\n      \"pmids\": [\"12087069\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"TGF-β1 causes long-term repression of ID2 and ID3, while BMP-7 induces sustained ID2/ID3 expression. Ectopic ID3 expression renders epithelial cells refractory to TGF-β-induced growth inhibition and epithelial-mesenchymal transition (EMT), phenocopying the BMP response. Knockdown of ID3 sensitizes cells to BMP-induced growth inhibition and transdifferentiation.\",\n      \"method\": \"cDNA microarray; ectopic overexpression; siRNA knockdown; growth inhibition assay; EMT morphology assessment; Smad4-deficient cells\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal gain- and loss-of-function with multiple cell-biological readouts, pathway position established relative to Smad4\",\n      \"pmids\": [\"15121845\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"ID3 has a T-cell intrinsic role in preventing autoimmune Sjögren's syndrome. Adoptive transfer of Id3-deficient T cells into wild-type recipients recapitulates disease symptoms (dry eyes/mouth, lymphocyte infiltration), and neonatal thymectomy or genetic T-cell ablation rescues disease in Id3 KO mice, indicating that abnormal T cells generated during thymic development drive the autoimmune phenotype.\",\n      \"method\": \"Id3 knockout mouse; adoptive transfer; neonatal thymectomy; T-cell ablation\",\n      \"journal\": \"Immunity\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — adoptive transfer establishes T-cell intrinsic mechanism, multiple complementary genetic interventions\",\n      \"pmids\": [\"15485632\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"ID3 (and ID1) undergo ubiquitin-dependent proteasomal degradation mediated by the COP9 signalosome (CSN). ID3 physically interacts with CSN subunits CSN5 and CSN7 (demonstrated by pull-down and far Western). Recombinant ID3 is not phosphorylated by CSN-associated kinases CK2 and PKD, but inhibits c-Jun and CSN2 phosphorylation by CK2. Inhibition of CSN-associated kinases by curcumin or emodin increases ID3 ubiquitination and degradation. Overexpression of CSN2 stabilizes ID3 protein.\",\n      \"method\": \"Mammalian two-hybrid; pull-down; far Western; in vitro kinase assay; co-transfection with His-ubiquitin; proteasome inhibitor treatment; His-pull-down for ubiquitin conjugates\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — multiple orthogonal biochemical methods (pull-down, far Western, in vitro kinase, ubiquitin co-transfection) in single study\",\n      \"pmids\": [\"15451666\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Latent membrane protein 1 (LMP1) of Epstein-Barr virus induces ID1 and ID3 expression via NF-κB and MAPK signaling; ID3 induction correlates with downregulation of p27Kip1, increased Cdk2 levels, and retinoblastoma protein hyperphosphorylation in LMP1-transformed cells.\",\n      \"method\": \"Genomic expression array; mRNA and protein validation; stable LMP1 expression in C33A and Rat-1 cells\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genomic screen confirmed by protein-level data, downstream cell-cycle pathway established, single lab\",\n      \"pmids\": [\"15564458\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"E2A/HEB heterodimers bind an E-box element in the SRG3 promoter to activate its transcription, and ID3 (induced by TCR→MEK/ERK) represses SRG3 by blocking this E-box binding. Enforced ID3 expression confers glucocorticoid resistance in thymocytes; overexpression of SRG3 overcomes ID3-mediated glucocorticoid resistance.\",\n      \"method\": \"Promoter-reporter assay; electrophoretic mobility shift assay (EMSA); retroviral transduction of Id3; SRG3 overexpression rescue\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — EMSA plus promoter reporter plus rescue experiment, single lab\",\n      \"pmids\": [\"15016815\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Id3 is a direct transcriptional target of Pax7 in quiescent satellite cells; chromatin immunoprecipitation shows Pax7 binding upstream of the Id3 promoter in quiescent satellite cells, a conserved Pax7-binding site is required for maximal promoter activation, and shRNA knockdown of Pax7 coordinately reduces Id2 and Id3 expression.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP); luciferase reporter assay with mutagenesis of Pax7 binding site; shRNA knockdown; ectopic Pax7 expression\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — ChIP plus reporter mutagenesis plus loss-of-function, multiple orthogonal methods in single study\",\n      \"pmids\": [\"19458195\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Vascular injury induces expression of a novel ID3 isoform (Id3a/Id3L) generated by alternative splicing retaining a 115-bp coding intron that encodes a unique 29-amino acid C-terminus. Unlike canonical ID3, Id3a does not promote SMC growth but instead stimulates apoptosis and inhibits neointimal lesion formation in vivo.\",\n      \"method\": \"Yeast two-hybrid cloning from SMC library; RT-PCR; adenoviral overexpression in SMCs; balloon injury rat carotid model; DNA fragmentation assay\",\n      \"journal\": \"Arteriosclerosis, thrombosis, and vascular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo vascular injury model plus in vitro functional assays distinguishing isoforms, single lab\",\n      \"pmids\": [\"11348870\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"The intron-retaining Id3a isoform fails to promote SMC S-phase entry or inhibit p21Cip1 transcription (unlike canonical Id3), but instead stimulates apoptosis and inhibits vascular lesion formation; adenoviral delivery of Id3a inhibits lesion formation in balloon-injured rat carotid arteries in vivo, defining a feedback loop via regulated intron retention.\",\n      \"method\": \"Adenoviral gene transfer; BrdU S-phase assay; p21 promoter reporter; in vivo balloon injury carotid model; Id3a-specific antibody\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo vascular model plus multiple in vitro functional assays, single lab\",\n      \"pmids\": [\"15159391\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Id3 regulates p27kip1 mRNA levels in early G1 phase through transcriptional repression via ELK1 inhibition. Id3 silencing prevents p27 mRNA downregulation, blocks G1 progression (inhibits pRb phosphorylation and p130 degradation), and inhibits G1/S transition (blocks cyclin A induction). ChIP confirms Id3-mediated repression through ELK1 at the p27 promoter.\",\n      \"method\": \"siRNA knockdown; quantitative RT-PCR; promoter-reporter assay; chromatin immunoprecipitation (ChIP); cell cycle analysis\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — ChIP plus promoter reporter plus loss-of-function with multiple cell-cycle readouts, single study\",\n      \"pmids\": [\"17404577\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"ID3 inhibits E47-mediated and SREBP-1c-mediated adiponectin promoter activation in a dose-dependent manner by interacting with E47 and preventing its binding to a consensus E-box in the adiponectin promoter. ChIP demonstrates E47 binding to the endogenous adiponectin promoter in differentiating adipocytes, which is abolished by ID3 overexpression and enhanced in Id3-null adipose tissue.\",\n      \"method\": \"Luciferase promoter assay; chromatin immunoprecipitation (ChIP); Id3 knockout mouse; ectopic overexpression; E-box mutation\",\n      \"journal\": \"Circulation research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — ChIP in vitro and in vivo, promoter reporter with E-box mutation, Id3 KO mouse, multiple orthogonal methods\",\n      \"pmids\": [\"18669923\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"The ERK–Egr–Id3 pathway plays a defining role in αβ vs. γδ T lineage fate specification: Id3 is markedly induced by γδTCR signaling and is necessary and sufficient to enable γδ-lineage cells to differentiate independently of Notch signaling and become competent IFN-γ-producing effectors.\",\n      \"method\": \"Id3 knockout mouse; retroviral Id3 overexpression; Notch inhibition; cytokine production assay; ERK pathway analysis\",\n      \"journal\": \"Immunity\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — both KO and ectopic expression with defined lineage-fate phenotype, epistasis with Notch pathway established\",\n      \"pmids\": [\"19833086\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Blimp-1 binds to and represses the Id3 promoter in short-lived effector CD8+ T cells (SLECs); repression of Id3 by Blimp-1 limits SLEC persistence as memory cells. Enforced Id3 expression restores SLEC survival and enhances recall responses. ID3 function in this context is mediated in part through inhibition of E2A transcriptional activity and induction of genes regulating genome stability.\",\n      \"method\": \"Chromatin immunoprecipitation; retroviral enforced expression of Id3; Id3 reporter mice; KLRG-1 memory cell analysis\",\n      \"journal\": \"Nature immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP establishes direct promoter binding, enforced expression rescue, replicated alongside parallel study (PMID:22057289)\",\n      \"pmids\": [\"22057288\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Id3hi precursors of long-lived CD8+ memory T cells are identifiable before the peak of T cell expansion using Id3 reporter mice. Deficiency in Id3 results in loss of distinct long-lived memory CD8+ T cell populations. Cytokines differentially regulate Id2 and Id3, linking external cues to gene expression programs controlling memory vs. effector fate.\",\n      \"method\": \"Id3 reporter knock-in mouse; Id3 knockout mouse; flow cytometry of memory populations; cytokine stimulation\",\n      \"journal\": \"Nature immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reporter KI and KO mice with defined T-cell memory phenotype, independently replicated alongside PMID:22057288\",\n      \"pmids\": [\"22057289\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"E2A genome-wide occupancy is altered by pre-TCR-mediated signaling; Id3 expression is higher beyond the pre-TCR checkpoint and remains high in naive T cells. Id3-deficient mice show aberrant effector-memory T cell development, elevated CXCR5 and Bcl-6, and formation of T cell–B cell conjugates and B cell follicles, demonstrating that Id3 antagonizes E2A activity to enforce the naive T cell fate.\",\n      \"method\": \"Id3 knockout mouse; E2A ChIP-seq (genome-wide occupancy); flow cytometry; immunohistology\",\n      \"journal\": \"Nature immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — genome-wide ChIP-seq plus KO mouse with defined phenotype, multiple readouts\",\n      \"pmids\": [\"21857655\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"ID1 and ID3 together govern colon cancer-initiating cell (CC-IC) self-renewal through regulation of p21 (CDKN1A). ID1/ID3 regulation of p21 is a central mechanism preventing accumulation of excess DNA damage and functional exhaustion of CC-ICs. Silencing of ID1 and ID3 increases sensitivity to oxaliplatin.\",\n      \"method\": \"siRNA silencing; serial transplantation (CC-IC self-renewal assay); p21 expression analysis; oxaliplatin sensitivity assay\",\n      \"journal\": \"Cancer cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function with defined cancer stem cell phenotype, downstream p21 mechanism identified, single lab\",\n      \"pmids\": [\"22698403\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Burkitt lymphoma carries recurrent somatic mutations in ID3 (68% of cases), concentrated at somatic hypermutation motifs, and many are in regions that could impair ID3 protein function (mapped to focal homozygous loss region at 1p). These mutations are enriched in Burkitt lymphoma compared with other B-cell lymphomas with IG-MYC translocation, establishing ID3 inactivation as a hallmark cooperating event in Burkitt lymphomagenesis.\",\n      \"method\": \"Whole-genome sequencing; whole-exome sequencing; transcriptome sequencing; extended cohort mutation analysis\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multi-platform sequencing with large cohort validation, independently confirmed in subsequent studies\",\n      \"pmids\": [\"23143595\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Loss of Id3 in B cells impairs their homing to the aorta and B-cell-mediated atheroprotection; the CCR6 chemokine receptor is identified as an Id3 target mediating aortic B-cell homing. Id3-null B cells transferred into B-cell-deficient mice fail to reconstitute aortic B cells and fail to protect against atherosclerosis.\",\n      \"method\": \"Id3 knockout in Apoe-/- mice; adoptive B-cell transfer; flow cytometry; atherosclerosis quantification; CCR6 expression analysis\",\n      \"journal\": \"Circulation research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — adoptive transfer establishes cell-intrinsic mechanism, CCR6 identified as target, single lab\",\n      \"pmids\": [\"22034493\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"ID3 suppresses glioma stem cell invasiveness by inhibiting p27KIP1-RhoA-dependent migration and MMP3 expression; EGFR inhibition decreases ID3 levels, thereby promoting invasion via these downstream effectors.\",\n      \"method\": \"EGFR inhibition; ID3 knockdown; p27KIP1 and MMP3 expression analysis; invasion assay; xenograft and human GBM specimens\",\n      \"journal\": \"Cancer letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function plus mechanistic downstream readouts, single lab, supported by in vivo specimens\",\n      \"pmids\": [\"23022473\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Id3 loss in Ldlr-/- mice increases VCAM-1 expression in vascular smooth muscle cells and aortic tissue. ChIP demonstrates that E12 binds the VCAM-1 promoter in VSMCs, and this binding is inhibited by Id3 overexpression; Id3 deficiency increases macrophage accumulation and accelerates atherosclerosis.\",\n      \"method\": \"Id3 knockout in Ldlr-/- mice; ChIP; VCAM-1 promoter reporter; primary VSMC gain/loss-of-function; immunostaining\",\n      \"journal\": \"Arteriosclerosis, thrombosis, and vascular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus promoter reporter plus in vivo atherosclerosis model, single lab\",\n      \"pmids\": [\"23042815\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"ID2 and ID3 expression in regulatory T cells is required to suppress fatal inflammatory disease; TCR-driven signaling decreases Id3 abundance to activate a follicular regulatory T (TFR) cell transcription signature, but sustained loss of Id2/Id3 impairs TFR cell development. Id2/Id3 depletion compromises Treg cell maintenance and localization.\",\n      \"method\": \"Conditional Id2/Id3 knockout in Treg cells; flow cytometry; transcriptional profiling; adoptive transfer\",\n      \"journal\": \"Nature immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO with defined Treg phenotype and TFR checkpoint, TCR-signaling mechanism identified\",\n      \"pmids\": [\"24973820\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"TGF-β1 and IL-4 downregulate ID3 expression via the kinase TAK1; reduction in ID3 enhances binding of E2A and GATA-3 to the Il9 promoter to promote Il9 transcription and TH9 differentiation. Deletion of Id3 increases IL-9 production from CD4+ T cells, identifying a TAK1–Id3–E2A–GATA-3 pathway governing TH9 fate.\",\n      \"method\": \"Id3 knockout mouse; cytokine stimulation; TAK1 inhibition; chromatin immunoprecipitation (E2A/GATA-3 at Il9 promoter); IL-9 production assay; melanoma model\",\n      \"journal\": \"Nature immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP plus KO plus TAK1 epistasis plus in vivo tumor model, multiple orthogonal methods\",\n      \"pmids\": [\"26322481\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Id3 depletion in adult neural stem/precursor cells (NSPCs) reduces astrocyte generation after cortical brain injury. BMP-2 upregulates Id3 in the SVZ stem cell niche after injury; Id3-deficient NSPCs fail to differentiate into BMP-2-induced astrocytes, while E47-deficient NSPCs differentiate into astrocytes without BMP-2. E47 represses astrocyte-specific gene expression and Id3 antagonizes E47 to promote astrocyte differentiation.\",\n      \"method\": \"Id3 knockout mouse; E47 conditional knockout; cortical injury model; neurosphere culture; astrocyte differentiation assay; BMP-2 treatment\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal KO of Id3 and E47 with defined differentiation phenotype establishes pathway epistasis, in vivo injury model\",\n      \"pmids\": [\"26438726\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Id3 downregulation in B cells is essential for releasing E2A and E2-2 (redundantly required) for antigen-induced B cell differentiation into germinal center B cells and plasma cells; this pathway controls Blimp1, Xbp1, and CXCR4 expression and is critical for establishing the GC transcriptional network.\",\n      \"method\": \"Id3 knockout mouse; B-cell differentiation assay; flow cytometry; gene expression analysis; antibody titer measurement\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KO with multiple downstream transcription factor readouts and functional B-cell differentiation phenotypes\",\n      \"pmids\": [\"27217539\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"In regulatory T cells, high Id3 expression restricts E47 activity to maintain Foxp3 transcription. Loss of Id3 or overexpression of E47 in Treg cells results in loss of Foxp3 expression; mechanistically, E47 activates Spi-B and SOCS3 expression, both of which downregulate Foxp3. Thus Id3–E47–Spi-B/SOCS3 is the pathway controlling Foxp3 stability.\",\n      \"method\": \"Id3-conditional KO; E47 retroviral overexpression; Foxp3 expression assay in vivo and in vitro; Spi-B and SOCS3 expression analysis\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO plus gain-of-function with downstream mechanistic readout, single lab\",\n      \"pmids\": [\"27974197\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"In response to DNA double-strand breaks, ATM phosphorylates ID3 at serine 65 within the HLH motif. This phosphorylation enables a direct interaction between ID3 and MDC1. Depletion of ID3 impairs MDC1 foci formation, suppresses γ-H2AX-bound MDC1, impairs DSB repair, causes cellular hypersensitivity to ionizing radiation, and leads to genomic instability. Disruption of the MDC1–ID3 interaction prevents MDC1 accumulation at DSB sites.\",\n      \"method\": \"Co-immunoprecipitation; ATM kinase assay; phospho-specific mutant analysis; siRNA depletion; immunofluorescence foci assay; comet assay; clonogenic survival assay\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — multiple orthogonal methods (Co-IP, kinase assay, mutagenesis, foci assay, functional DNA repair) in single rigorous study\",\n      \"pmids\": [\"29026069\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"BMP2 stimulates ID3 transcription via BMPR2 and BMPR1A (ALK3) receptors and intracellular SMAD1 and SMAD5 signaling. Two cis-regulatory elements mediate this induction: a novel 6-bp proximal element and a distal SMAD-responsive enhancer. The proximal element does not bind SMADs directly but binds a specific protein complex.\",\n      \"method\": \"Quantitative RT-PCR; promoter-reporter analysis; receptor and SMAD overexpression; RNA interference; cis-element mutagenesis\",\n      \"journal\": \"Molecular and cellular endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — promoter dissection with mutagenesis plus gain/loss-of-function for receptors and SMADs, single lab\",\n      \"pmids\": [\"21056086\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"ANGPTL4 binds to cadherin-11, releasing membrane-bound β-catenin, which translocates to the nucleus and transcriptionally upregulates ID3 expression in fibroblasts. ID3 then interacts with scleraxis (a bHLH transcription factor) to inhibit scar-associated collagen types 1α2 and 3α1 production.\",\n      \"method\": \"Co-immunoprecipitation; ANGPTL4/cadherin-11 binding assay; nuclear β-catenin fractionation; Id3 promoter reporter; Id3 siRNA; collagen expression assay\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus reporter assay plus loss-of-function with downstream collagen readout, single lab\",\n      \"pmids\": [\"28740178\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"CD5L promotes M2 macrophage polarization by inducing ID3 expression through an autophagy-dependent pathway requiring ATG7. siRNA targeting ATG7 blocks CD5L-induced ID3 upregulation, and ID3 silencing reverses CD5L-mediated polarization, placing ID3 downstream of CD5L-induced autophagy in macrophage polarization.\",\n      \"method\": \"siRNA silencing of ATG7 and ID3; LC3-II content and colocalization assay; gene expression profiling; flow cytometry\",\n      \"journal\": \"Frontiers in immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA epistasis (ATG7→ID3→polarization) with multiple readouts, single lab\",\n      \"pmids\": [\"29593730\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"ID3 interacts with E47 and blocks E47 recruitment to the β-catenin promoter, leading to activation of Wnt/β-catenin signaling and promotion of stemness in intrahepatic cholangiocarcinoma cells.\",\n      \"method\": \"Co-immunoprecipitation (ID3–E47); chromatin immunoprecipitation (E47 at β-catenin promoter); ID3 overexpression/knockdown; Wnt/β-catenin reporter; in vivo xenograft\",\n      \"journal\": \"Hepatology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus ChIP plus functional reporter in cancer cells, single lab\",\n      \"pmids\": [\"30520117\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"ID3 is the lineage-determining factor for Kupffer cells that controls the macrophage inhibitory/activating receptor balance and confers anti-tumor phagocytic activity. Mechanistically, ID3 buffers binding of transcription factors ELK1 and E2A at the SIRPA (SIRPα) locus to reduce inhibitory receptor expression. Loss- and gain-of-function in both mouse bone-marrow-derived and human iPSC-derived macrophages confirm ID3 is sufficient to confer potent anti-tumor activity.\",\n      \"method\": \"Id3 loss-of-function and gain-of-function in macrophages; ChIP for ELK1 and E2A at SIRPA locus; phagocytosis assay of live tumor cells; NK/CD8 T cell recruitment assay; human iPSC-derived macrophage experiments\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — ChIP establishes molecular mechanism at SIRPA locus, reciprocal loss/gain-of-function in mouse and human macrophages, multiple functional readouts\",\n      \"pmids\": [\"38326607\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"ID3 expression identifies a common progenitor of stem-like memory and precursors of exhausted CD8+ T cells (Tpex). ID3 expression itself is required for Tpex cell maintenance during chronic infection and cancer; loss of ID3 results in impaired CD8 T cell immunity. IL-1 family members (IL-36β and IL-18) promote generation of ID3+ stem-like T cells with superior tumor control.\",\n      \"method\": \"Id3 knockout mouse; Id3 reporter; adoptive transfer; chronic infection models; tumor models; cytokine stimulation\",\n      \"journal\": \"Science immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — KO plus reporter plus adoptive transfer in multiple disease models, IL-1 cytokine epistasis established\",\n      \"pmids\": [\"39888981\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ID3 is a dominant-negative HLH protein that lacks a DNA-binding basic region and functions primarily by heterodimerizing with E-protein transcription factors (E12, E47, E2-2, HEB) to prevent their binding to E-box sequences and block bHLH-dependent transcription; its activity is cell-cycle regulated by Cdk2-dependent phosphorylation at Ser5, it is degraded via the COP9 signalosome–ubiquitin–proteasome pathway, it is induced downstream of Ras–ERK MAPK and TGF-β/BMP–SMAD signaling (and directly by Pax7, Wnt/β-catenin, and BMP2 at defined promoter elements), and in response to DNA double-strand breaks ATM phosphorylates ID3 at Ser65 to enable direct interaction with MDC1 and facilitate DNA damage repair; through these mechanisms ID3 controls cell cycle progression (repressing p21 and p27 transcription, promoting Rb phosphorylation), opposes E-protein-driven differentiation programs across multiple lineages (lymphocytes, muscle, adipocytes, neural cells, endothelium), maintains stemness and memory potential in T cells, governs macrophage anti-tumor activity by buffering ELK1/E2A occupancy at the SIRPA locus, and is recurrently inactivated by somatic mutation in Burkitt lymphoma.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"ID3 is a dominant-negative helix-loop-helix (HLH) protein that controls the balance between proliferation and differentiation across many lineages by sequestering E-protein transcription factors and blocking their binding to E-box DNA elements [#0, #1]. Lacking its own basic DNA-binding region, ID3 forms heterodimers with bHLH proteins including E12, E47, E2-2 and MyoD, preferentially targeting E2A-class factors and inhibiting both their DNA binding and transcriptional activity [#0, #1, #6]. Through this antagonism ID3 drives cell-cycle progression and represses differentiation: it promotes S-phase entry, opposes muscle, adipocyte and erythroid differentiation programs [#3, #5, #6], and transcriptionally represses the CDK inhibitors p21 and p27 — the latter through inhibition of ELK1 at the p27 promoter — thereby promoting Rb hyperphosphorylation [#13, #23]. ID3 activity is gated by signaling and post-translational control: cyclin E/A–Cdk2 phosphorylates ID3 at Ser5 to nullify its G1 function and shift its bHLH target specificity [#4], and ID3 is turned over by ubiquitin-dependent proteasomal degradation involving the COP9 signalosome subunits CSN5/CSN7 [#17]. ID3 transcription is induced by Ras–ERK MAPK signaling downstream of antigen receptors [#11], by TGF-\\u03b2 and BMP–SMAD signaling [#12, #15, #40], and directly by Pax7, Wnt/\\u03b2-catenin and BMP2 at defined promoter elements [#20, #40, #43]. In the immune system ID3 enforces naive, memory and regulatory T-cell fates by restraining E2A/E2-2 activity, governing thymocyte selection, \\u03b1\\u03b2/\\u03b3\\u03b4 lineage choice, Treg Foxp3 maintenance, germinal-center B-cell differentiation and stem-like memory CD8 T-cell programs [#8, #25, #28, #34, #37, #45]. Beyond transcription, ATM phosphorylates ID3 at Ser65 following DNA double-strand breaks to enable direct interaction with MDC1, promoting MDC1 foci formation and double-strand-break repair [#39]. ID3 also determines Kupffer-cell anti-tumor phagocytic activity by buffering ELK1 and E2A occupancy at the SIRPA locus [#44], and is recurrently inactivated by somatic mutation in Burkitt lymphoma, establishing it as a tumor suppressor in that disease [#30].\",\n  \"teleology\": [\n    {\n      \"year\": 1994,\n      \"claim\": \"Established the fundamental biochemical mechanism: how a protein lacking a DNA-binding domain could regulate transcription, by showing ID3 acts as a dominant-negative dimerization partner.\",\n      \"evidence\": \"In vitro DNA-binding inhibition and heterodimer formation assays with E47 and MyoD\",\n      \"pmids\": [\"8139914\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define which E-proteins are physiologically targeted in vivo\", \"No structural basis for dimerization specificity\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Defined ID3's interaction partner repertoire and target preference, showing it selectively engages E2A-class factors over c-Myc and that both HLH and C-terminal domains are required for dominant-negative differentiation block.\",\n      \"evidence\": \"Yeast two-hybrid, co-immunoprecipitation, reporter assays, and domain mutagenesis in muscle cells\",\n      \"pmids\": [\"8759016\", \"8853903\", \"8853902\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"C-terminal domain mechanism not molecularly defined\", \"In vitro target preference not validated genome-wide\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Resolved how ID3 activity is temporally controlled within the cell cycle by identifying Cdk2 phosphorylation at Ser5 as a switch that nullifies its G1 function and alters bHLH target specificity.\",\n      \"evidence\": \"In vitro kinase assays, Ser5\\u2192Asp/Ala mutagenesis, E-box reporter and S-phase entry assays\",\n      \"pmids\": [\"9372912\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo kinetics of phosphorylation cycling not established\", \"How phosphorylation alters target selectivity mechanistically unresolved\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Generalized the anti-differentiation role beyond muscle, showing ID3 blocks adipogenesis and is transcriptionally downregulated during differentiation.\",\n      \"evidence\": \"Stable ID3 overexpression and transcription-rate analysis in preadipocytes\",\n      \"pmids\": [\"9121427\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"E-protein target in adipogenesis not yet identified (later resolved as E47/adiponectin)\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Genetic knockouts established ID3's non-redundant, lineage-specific roles in lymphocyte signaling, thymocyte selection, and neural/endothelial development, placing it in the E2A pathway in vivo.\",\n      \"evidence\": \"Id3 single and Id1/Id3 double knockout mice with proliferation, selection, neural marker and xenograft vascularization assays\",\n      \"pmids\": [\"10454544\", \"10661402\", \"10537105\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional redundancy among Id family members complicates single-gene interpretation\", \"Direct E2A target genes downstream not yet mapped\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Connected upstream signaling to ID3, showing Ras\\u2013ERK MAPK downstream of TCR and TGF-\\u03b2 control ID3 transcription, linking extracellular cues to E-protein activity.\",\n      \"evidence\": \"Primary thymocyte stimulation with ERK inhibition; TGF-\\u03b2 stimulation in knockout B-cell progenitors\",\n      \"pmids\": [\"11175815\", \"11224524\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Transcription factors directly driving ID3 induction not pinpointed in these studies\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Revealed isoform-level functional diversification: an intron-retaining Id3a isoform with a distinct C-terminus that is pro-apoptotic rather than pro-proliferative in vascular smooth muscle.\",\n      \"evidence\": \"RT-PCR cloning, adenoviral overexpression, and balloon-injury carotid model\",\n      \"pmids\": [\"11348870\", \"15159391\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Regulation of the splicing switch not defined\", \"Human relevance of the isoform unclear\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Established the downstream cell-cycle output of ID3 in vascular cells, repressing p21, p27 and p53 and driving Rb hyperphosphorylation, with KLF4 identified as an upstream repressor.\",\n      \"evidence\": \"Antisense/sense transfection, Western blotting for cell-cycle regulators, and promoter binding analysis in VSMCs\",\n      \"pmids\": [\"12021231\", \"12087069\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether p21/p27 repression is direct or E-protein-mediated not resolved here\", \"Single lab\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Defined ID3 protein turnover, showing COP9 signalosome–dependent ubiquitin-proteasome degradation via CSN5/CSN7 interaction, providing a post-translational layer of regulation.\",\n      \"evidence\": \"Mammalian two-hybrid, pull-down, far Western, in vitro kinase and ubiquitin co-transfection assays\",\n      \"pmids\": [\"15451666\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"E3 ligase mediating ID3 ubiquitination not identified\", \"Physiological signals triggering degradation unclear\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Positioned ID3 as a TGF-\\u03b2/BMP signaling node controlling EMT and growth inhibition, and resolved direct E-box target mechanisms at the SRG3 promoter underlying glucocorticoid sensitivity.\",\n      \"evidence\": \"cDNA microarray, reciprocal overexpression/knockdown, EMSA and promoter reporters in epithelial cells and thymocytes\",\n      \"pmids\": [\"15121845\", \"15016815\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Promoter-specific selectivity of E-protein targeting not generalized\", \"EMT effector genes downstream not mapped\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Extended ID3's role to autoimmunity and viral oncogenesis, showing a T-cell-intrinsic protective function against Sjögren-like disease and EBV-LMP1 induction of ID3.\",\n      \"evidence\": \"Adoptive transfer and thymectomy in Id3 knockout mice; expression arrays in LMP1-transformed cells\",\n      \"pmids\": [\"15485632\", \"15564458\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the autoreactive T-cell-driving E-protein target unresolved\", \"LMP1\\u2192ID3 functional consequence inferred from correlation\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Defined the direct transcriptional mechanism of cell-cycle control, showing ID3 represses p27 via inhibition of ELK1 at the p27 promoter to drive G1/S progression.\",\n      \"evidence\": \"siRNA knockdown, qRT-PCR, promoter reporter, ChIP and cell-cycle analysis\",\n      \"pmids\": [\"17404577\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How ID3 inhibits ELK1 mechanistically (direct binding vs. indirect) not fully resolved\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Provided definitive in vivo and in vitro evidence for the E-box displacement mechanism in adipogenesis, showing ID3 blocks E47 binding to the adiponectin promoter.\",\n      \"evidence\": \"ChIP in differentiating adipocytes and Id3-null tissue, promoter reporter with E-box mutation\",\n      \"pmids\": [\"18669923\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Metabolic phenotype of altered adiponectin in vivo not fully characterized\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Established ID3 as a determinant of T-lineage fate, being induced by ERK\\u2013Egr signaling and necessary and sufficient for \\u03b3\\u03b4 effector differentiation independent of Notch.\",\n      \"evidence\": \"Id3 knockout and retroviral overexpression with Notch inhibition and cytokine assays\",\n      \"pmids\": [\"19833086\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"E-protein targets specifying \\u03b3\\u03b4 effector program not detailed\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Dissected the BMP2\\u2192SMAD transcriptional control of ID3, identifying distinct proximal and distal cis-regulatory elements.\",\n      \"evidence\": \"Promoter-reporter dissection with mutagenesis, receptor and SMAD overexpression and RNAi\",\n      \"pmids\": [\"21056086\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Identity of the protein complex binding the novel proximal element not determined\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Identified ID3 as a master regulator of CD8 T-cell memory versus effector fate, repressed by Blimp-1 in short-lived effectors and marking long-lived memory precursors.\",\n      \"evidence\": \"ChIP, retroviral enforced expression, and Id3 reporter/knockout mice with memory population analysis\",\n      \"pmids\": [\"22057288\", \"22057289\", \"21857655\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream genome-stability genes mediating memory persistence only partially defined\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Established ID3 as a context-dependent cancer regulator: a self-renewal/genome-protection factor in colon and glioma stem cells, and a recurrently inactivated tumor suppressor in Burkitt lymphoma.\",\n      \"evidence\": \"siRNA silencing with serial transplantation and invasion assays; whole-genome/exome sequencing of Burkitt lymphoma cohorts\",\n      \"pmids\": [\"22698403\", \"23022473\", \"23143595\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Opposing oncogenic vs. tumor-suppressive roles across tissues not mechanistically reconciled\", \"Functional impact of specific Burkitt mutations on E-protein binding not assayed\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Extended ID3's vascular role to atheroprotection, governing B-cell aortic homing via CCR6 and VSMC VCAM-1 expression via E12 antagonism.\",\n      \"evidence\": \"Id3 knockout in Apoe-/- and Ldlr-/- mice, adoptive transfer, ChIP and atherosclerosis quantification\",\n      \"pmids\": [\"22034493\", \"23042815\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism linking ID3 to CCR6 transcription not fully defined\", \"Single lab\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Defined ID2/ID3 as required for regulatory and follicular regulatory T-cell homeostasis, with TCR signaling lowering ID3 to enable the TFR program.\",\n      \"evidence\": \"Conditional Id2/Id3 knockout in Treg cells with transcriptional profiling and adoptive transfer\",\n      \"pmids\": [\"24973820\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Quantitative threshold of ID3 dosage governing the switch not defined\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Resolved how cytokine signaling tunes ID3 to control TH9 differentiation, identifying a TAK1\\u2013Id3\\u2013E2A/GATA-3 axis at the Il9 promoter.\",\n      \"evidence\": \"Id3 knockout, TAK1 inhibition, ChIP at Il9 promoter and IL-9 production in a melanoma model\",\n      \"pmids\": [\"26322481\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct E2A/GATA-3 cooperation mechanism at Il9 not fully resolved\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Established reciprocal ID3\\u2013E47 control of neural stem cell astrocyte differentiation downstream of BMP-2 injury signaling.\",\n      \"evidence\": \"Reciprocal Id3 and E47 knockout in NSPCs with cortical injury and differentiation assays\",\n      \"pmids\": [\"26438726\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Astrocyte-specific genes repressed by E47 not enumerated\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Defined the requirement for ID3 downregulation to release E2A/E2-2 for germinal-center B-cell and plasma-cell differentiation, and ID3 maintenance of Treg Foxp3 stability via E47\\u2013Spi-B/SOCS3.\",\n      \"evidence\": \"Id3 knockout B-cell differentiation assays; conditional Id3 KO and E47 overexpression in Treg cells\",\n      \"pmids\": [\"27217539\", \"27974197\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Redundancy of E2A and E2-2 not quantitatively partitioned\", \"Treg Foxp3 mechanism single lab\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Uncovered a transcription-independent function: ATM-phosphorylated ID3 (Ser65) directly binds MDC1 to promote DNA double-strand-break repair, expanding ID3 biology beyond E-protein antagonism.\",\n      \"evidence\": \"Co-IP, ATM kinase assay, phospho-mutant analysis, MDC1 foci imaging, comet and clonogenic survival assays\",\n      \"pmids\": [\"29026069\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How ID3 mechanistically stabilizes MDC1 at breaks unresolved\", \"Relationship to ID3 transcriptional roles unclear\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Linked Wnt/\\u03b2-catenin and ANGPTL4 signaling to ID3 induction, with ID3 then engaging scleraxis to limit fibrotic collagen production.\",\n      \"evidence\": \"Co-IP, nuclear \\u03b2-catenin fractionation, Id3 reporter, siRNA and collagen assays in fibroblasts\",\n      \"pmids\": [\"28740178\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct ID3\\u2013scleraxis structural interaction not characterized\", \"Single lab\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Placed ID3 downstream of CD5L-induced autophagy in M2 macrophage polarization.\",\n      \"evidence\": \"siRNA epistasis (ATG7\\u2192ID3\\u2192polarization) with LC3-II and flow cytometry readouts\",\n      \"pmids\": [\"29593730\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which autophagy induces ID3 transcription unknown\", \"Single lab\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Showed ID3 promotes cancer stemness by blocking E47 recruitment to the \\u03b2-catenin promoter, activating Wnt signaling in cholangiocarcinoma.\",\n      \"evidence\": \"Co-IP, ChIP, ID3 overexpression/knockdown, Wnt reporter and xenograft\",\n      \"pmids\": [\"30520117\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Reciprocity with prior \\u03b2-catenin\\u2192ID3 induction model not reconciled\", \"Single lab\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Established ID3 as the Kupffer-cell lineage-determining factor controlling macrophage anti-tumor activity by buffering ELK1/E2A occupancy at the SIRPA locus.\",\n      \"evidence\": \"Reciprocal loss/gain-of-function in mouse and human iPSC-derived macrophages, ChIP at SIRPA, and phagocytosis assays\",\n      \"pmids\": [\"38326607\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How ID3 dosage sets the inhibitory/activating receptor balance quantitatively unresolved\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Defined ID3 as a marker and requirement of stem-like/Tpex CD8 T-cell progenitors essential for durable anti-tumor and anti-chronic-infection immunity, inducible by IL-1 family cytokines.\",\n      \"evidence\": \"Id3 knockout and reporter mice, adoptive transfer in chronic infection and tumor models, cytokine stimulation\",\n      \"pmids\": [\"39888981\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Transcriptional targets of ID3 sustaining the Tpex state not enumerated\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How ID3's transcription-independent DNA-repair role integrates with its dominant E-protein-antagonist function, and what reconciles its opposing oncogenic versus tumor-suppressive roles across tissues, remain open.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural model of ID3\\u2013MDC1 versus ID3\\u2013E-protein interaction surfaces\", \"E3 ligase and full degradation machinery undefined\", \"Context-determinants of oncogenic vs. tumor-suppressive function unresolved\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 1, 6, 23, 24, 28, 44]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 1, 4, 24, 39, 43]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 1, 39]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [24, 28, 39]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [1, 6, 23, 24, 28, 44]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [3, 4, 13, 23]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [7, 8, 25, 26, 27, 34, 35, 37, 44, 45]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [11, 12, 15, 40, 43]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [39]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [9, 20, 25, 36]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [30, 32, 43]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"E47\", \"E2A\", \"E12\", \"E2-2\", \"MyoD\", \"MDC1\", \"ELK1\", \"CSN5\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"tie","faith_supported":8,"faith_total":8,"faith_pct":100.0}}