{"gene":"ID3","run_date":"2026-04-28T18:06:53","timeline":{"discoveries":[{"year":1996,"finding":"Id3 inhibits muscle cell differentiation by preventing formation of functional dimers with myogenic bHLH proteins; both the HLH and COOH-terminal domains of Id3 are necessary and sufficient for its dominant-negative activity, and stable overexpression of Id3 reduces DNA-binding activity in nuclear extracts from myoblasts.","method":"Stable overexpression, antisense blockade, in vitro DNA-binding assay, in situ hybridization","journal":"Cell Growth & Differentiation","confidence":"High","confidence_rationale":"Tier 1/2 — multiple orthogonal methods (OE, antisense KD, EMSA, domain mutagenesis) in two independent papers","pmids":["8853903","8853902"],"is_preprint":false},{"year":1996,"finding":"Id3 physically interacts with E12, E47, ALF1, and Id4 (identified by yeast two-hybrid and confirmed by co-immunoprecipitation), disrupts their DNA binding in vitro, and blocks transcriptional activation by E-proteins in cultured cells; Id3 also shows evidence of interaction with E2-2 and MyoD but not c-Myc.","method":"Yeast two-hybrid, co-immunoprecipitation, EMSA, reporter gene assay","journal":"Nucleic Acids Research","confidence":"High","confidence_rationale":"Tier 1 — yeast two-hybrid plus reciprocal co-IP plus in vitro DNA-binding assay plus transcriptional reporter, single study with multiple orthogonal methods","pmids":["8759016"],"is_preprint":false},{"year":1997,"finding":"Cyclin E-Cdk2 and cyclin A-Cdk2 phosphorylate Id3 at Ser5 during late G1-to-S phase transition; phosphorylation alters Id3 target bHLH specificity and nullifies Id3's ability to promote S-phase entry. A phosphomimetic Id3(Asp5) mutant fails to promote S-phase entry, while a phospho-ablating Id3(Ala5) mutant displays enhanced activity compared with wild-type Id3.","method":"In vitro kinase assay, site-directed mutagenesis, EMSA, reporter gene assay, transfected fibroblast proliferation assay","journal":"Molecular and Cellular Biology","confidence":"High","confidence_rationale":"Tier 1 — in vitro kinase assay with mutagenesis and functional cell-cycle readout","pmids":["9372912"],"is_preprint":false},{"year":1998,"finding":"Id3 selectively targets E2A (E47) over other bHLH proteins in non-lymphoid hematopoietic cells; enforced Id3 expression in K562 erythroid progenitors promotes erythroid differentiation by shifting the profile of TAL1/E-protein heterodimers binding to E-box sequences, as shown by band-shift assays and a Gal4-VP16 two-hybrid competition assay.","method":"Retroviral overexpression, EMSA, Gal4-VP16 two-hybrid competition, E-box reporter assay","journal":"Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 1/2 — multiple orthogonal assays in a single study demonstrating selective E2A/E47 targeting","pmids":["9525934"],"is_preprint":false},{"year":1999,"finding":"Id3 deficiency in mice impairs B-cell proliferation in response to BCR cross-linking, identifying Id3 as an essential mediator of BCR-to-cell-cycle-progression signaling; the proliferation defect can be rescued by ectopic expression of Id1, demonstrating functional redundancy within the Id family.","method":"Gene knockout mouse, BCR cross-linking proliferation assay, retroviral Id1 rescue","journal":"Molecular and Cellular Biology","confidence":"High","confidence_rationale":"Tier 2 — clean KO with specific cellular phenotype plus genetic rescue","pmids":["10454544"],"is_preprint":false},{"year":1999,"finding":"Targeted disruption of Id1 and Id3 together in mice causes premature neuroblast withdrawal from the cell cycle, neural differentiation marker expression, forebrain vascular malformations, and failure to support tumor xenograft growth/vascularization, establishing Id1/Id3 as required for maintaining neuronal cell-cycle timing and tumour angiogenesis.","method":"Double knockout mouse, tumor xenograft assay, histology, immunofluorescence","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 — clean double KO with multiple specific in vivo phenotypic readouts, highly cited foundational paper","pmids":["10537105"],"is_preprint":false},{"year":2000,"finding":"Id3 (and Id2) suppress the development of CD34+ progenitors into pre-DC2 (plasmacytoid DC precursors) but not into DC1 precursors, while promoting NK cell development; this establishes Id3 as a lineage-fate switch between DC2/T/B versus NK cell fates.","method":"Retroviral ectopic expression in CD34+ progenitor culture system, flow cytometry","journal":"Journal of Experimental Medicine","confidence":"Medium","confidence_rationale":"Tier 2 — retroviral OE with specific lineage phenotype readout, single lab","pmids":["11120774"],"is_preprint":false},{"year":2000,"finding":"Id3 null mutation in mice abrogates MHC class I- and class II-restricted thymocyte positive selection and severely perturbs H-Y TCR-mediated negative selection; genetic interaction between E2A and Id3 in thymocyte development was demonstrated by epistasis analysis.","method":"Id3 knockout mouse, thymocyte selection assay, epistasis with E2A","journal":"Immunity","confidence":"High","confidence_rationale":"Tier 2 — clean KO with specific developmental phenotype and genetic epistasis","pmids":["10661402"],"is_preprint":false},{"year":2001,"finding":"Id3 is induced by TGF-β in lymphocyte progenitors and mediates TGF-β-induced apoptosis and growth arrest; in Id3-deficient progenitors the growth-suppressive and pro-apoptotic response to TGF-β is perturbed, placing Id3 downstream of TGF-β and upstream of E-protein-controlled survival.","method":"Id3 knockout mouse, TGF-β treatment, apoptosis assay, lymphocyte progenitor culture","journal":"Nature Immunology","confidence":"High","confidence_rationale":"Tier 2 — KO mouse with specific cytokine-pathway placement and apoptosis readout","pmids":["11224524"],"is_preprint":false},{"year":2001,"finding":"TCR-mediated signaling through the ERK MAPK cascade rapidly induces Id3 transcription in a dose-dependent manner, which lowers E2A DNA-binding activity in primary thymocytes without altering E2A protein levels, directly linking the Ras-ERK pathway to HLH regulation in a linear signaling pathway.","method":"Primary thymocyte culture, TCR ligation, ERK inhibition, EMSA, RT-PCR, Western blot","journal":"Nature Immunology","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods establishing linear pathway from ERK to Id3 to E2A","pmids":["11175815"],"is_preprint":false},{"year":2002,"finding":"Angiotensin II induces Id3 expression in vascular smooth muscle cells via superoxide production (blocked by SOD but not catalase); Id3 upregulation drives VSMC proliferation by downregulating p21(WAF1/Cip1), p27(Kip1), and p53 and causing retinoblastoma protein hyperphosphorylation; antisense Id3 abolishes all these effects.","method":"Differential display, antisense transfection, Western blot, DNA synthesis assay, sense-Id3 overexpression","journal":"Circulation","confidence":"Medium","confidence_rationale":"Tier 2 — gain and loss of function with defined molecular targets in a single lab","pmids":["12021231"],"is_preprint":false},{"year":2004,"finding":"Id3 protein is ubiquitinated and degraded by the proteasome; Id3 physically interacts with CSN5 and CSN7 subunits of the COP9 signalosome (demonstrated by mammalian two-hybrid, pull-down, and far-Western), and CSN-associated kinase inhibitors (curcumin, emodin) induce Id3 ubiquitination and degradation; CSN2 overexpression stabilizes Id3.","method":"Mammalian two-hybrid, pull-down, far-Western, His-ubiquitin co-transfection, proteasome inhibition","journal":"Journal of Molecular Biology","confidence":"High","confidence_rationale":"Tier 1/2 — multiple orthogonal binding assays plus direct ubiquitination demonstration","pmids":["15451666"],"is_preprint":false},{"year":2004,"finding":"Phosphorylation of Id3 in vascular smooth muscle cells provides a regulatory switch controlling Id3-induced repression of p21(Cip1) and VSMC growth, occurring both in vitro and in vivo during vascular lesion formation.","method":"Phosphorylation assay in primary VSMCs and in vivo lesion model, p21(Cip1) reporter assay","journal":"Circulation Research","confidence":"Medium","confidence_rationale":"Tier 2 — in vivo and in vitro phosphorylation with functional readout, single lab","pmids":["15321928"],"is_preprint":false},{"year":2004,"finding":"An intron-retention isoform of Id3 (Id3a), expressed during vascular lesion formation, fails to promote smooth muscle cell growth or repress p21(Cip1) but instead stimulates SMC apoptosis and inhibits endogenous Id3 production; adenoviral Id3a delivery inhibits vascular lesion formation in balloon-injured rat carotid arteries in vivo.","method":"In vivo balloon injury model, adenoviral gene delivery, Id3a-specific antibody, proliferation/apoptosis assays, p21(Cip1) reporter assay","journal":"Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 1/2 — novel isoform characterization with in vivo functional validation and multiple mechanistic readouts","pmids":["15159391"],"is_preprint":false},{"year":2004,"finding":"Id3-deficient mice develop autoimmune Sjögren's syndrome-like disease; adoptive transfer experiments demonstrate a T cell-intrinsic role for Id3, and neonatal thymectomy rescues disease symptoms, establishing that Id3 controls thymic T cell development that prevents autoimmune exocrinopathy.","method":"Id3 knockout mouse, adoptive transfer, neonatal thymectomy, histology, autoantibody assay","journal":"Immunity","confidence":"High","confidence_rationale":"Tier 2 — KO with adoptive transfer and surgical rescue establishing T cell-intrinsic, thymus-dependent mechanism","pmids":["15485632"],"is_preprint":false},{"year":2005,"finding":"Id3 induces apoptosis in immortalized keratinocytes via a Bax-mediated mitochondrial caspase-9 pathway, activating caspase-3; dominant-negative caspase-9 or Bcl-2 overexpression suppresses Id3-induced apoptosis, and siRNA knockdown of Id3 abrogates UVB-induced caspase-3 activation.","method":"Overexpression, siRNA, dominant-negative caspase-9 co-transfection, Annexin V, active caspase-3/9 immunostaining","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 2 — gain and loss of function with pathway-specific rescue experiments","pmids":["16449966"],"is_preprint":false},{"year":2005,"finding":"Id3 induces growth arrest and caspase-2-dependent apoptosis in B lymphocyte progenitors through a mechanism that does not require p53 and is not inhibited by Bcl-2; Id3 reduces expression of E-protein target genes and proliferation genes, and chemical growth arrest alone is sufficient to activate caspase-2.","method":"Retroviral Id3 expression, caspase-2 assay, p53-deficient and Bcl-2-overexpressing cells, gene expression analysis","journal":"Journal of Immunology","confidence":"High","confidence_rationale":"Tier 2 — gain of function with mechanistic dissection using specific caspase and pathway controls","pmids":["16177095"],"is_preprint":false},{"year":2006,"finding":"MeCP2 binds near or within the promoters of ID1, ID2, and ID3 genes (confirmed by chromatin immunoprecipitation) and represses their transcription; loss of MeCP2 results in elevated ID3 expression in mouse brain and human Rett syndrome brain.","method":"Chromatin immunoprecipitation, genome-wide expression microarray, quantitative RT-PCR, immunofluorescence, laser scanning cytometry","journal":"Human Molecular Genetics","confidence":"High","confidence_rationale":"Tier 1/2 — ChIP demonstrating direct promoter binding with corroborating expression data in two model systems","pmids":["16682435"],"is_preprint":false},{"year":2007,"finding":"Id3 represses p27(Kip1) mRNA transcription in early G1 phase through inhibition of the transcription factor ELK1; Id3 silencing reverses injury-induced p27 downregulation, blocks pRb phosphorylation and p130 degradation, and prevents G1/S transition; Id3 interaction with ELK1 at the p27 promoter was demonstrated by ChIP.","method":"siRNA, quantitative PCR, reporter gene assay, chromatin immunoprecipitation, flow cytometry","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 1/2 — siRNA knockdown with ChIP, reporter assay, and multiple cell-cycle readouts","pmids":["17404577"],"is_preprint":false},{"year":2008,"finding":"Id3 inhibits adiponectin expression by binding E47 and preventing E47-mediated potentiation of SREBP-1c-driven adiponectin promoter activation; Id3 dose-dependently inhibits E47 transcriptional activity, E47 binding to the adiponectin promoter is abolished by Id3 overexpression and enhanced in Id3-null adipose tissue (demonstrated by ChIP), and Id3-null mice show increased serum adiponectin.","method":"ChIP, reporter gene assay, Id3 overexpression and Id3-null mice, adiponectin promoter mutagenesis","journal":"Circulation Research","confidence":"High","confidence_rationale":"Tier 1/2 — ChIP in vitro and in vivo, reporter assay with mutagenesis, KO mouse confirmation","pmids":["18669923"],"is_preprint":false},{"year":2008,"finding":"RhoA/Rho-associated kinase signaling in proliferating myoblasts activates MRTF-A, which forms a complex with Smad1/4 to strongly activate Id3 gene transcription; during differentiation, a forkhead transcription factor translocates to the nucleus and suppresses Id3 expression by preventing MRTF-A–Smad complex association with the Id3 promoter.","method":"C2C12 myoblast culture, RhoA/ROCK inhibition, MRTF-A/Smad co-IP, Id3 promoter reporter assay, forkhead factor overexpression","journal":"Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 2 — complex formation demonstrated by co-IP, promoter reporter, and functional rescue in a defined signaling context","pmids":["18477564"],"is_preprint":false},{"year":2010,"finding":"Blimp-1 binds to and represses the Id3 promoter in short-lived effector CD8+ T cells (SLECs); this repression of Id3 limits the ability of SLECs to persist as memory cells; enforced Id3 expression restores SLEC survival and recall responses, and Id3 functions in part by inhibiting E2A transcriptional activity.","method":"ChIP (Blimp-1 binding to Id3 promoter), retroviral Id3 overexpression, Id3-/- mice, KLRG-1/memory marker analysis","journal":"Nature Immunology","confidence":"High","confidence_rationale":"Tier 1/2 — ChIP demonstrating direct promoter repression plus loss- and gain-of-function with defined memory phenotype","pmids":["22057288"],"is_preprint":false},{"year":2010,"finding":"Deletion of Id3 results in defective Foxp3+ regulatory T cell generation; two TGF-β1-dependent mechanisms are identified: (1) enhanced E2A binding to the Foxp3 promoter promotes Foxp3 transcription, and (2) Id3 is required to relieve GATA-3-mediated inhibition of the Foxp3 promoter; Id3-/- T cells show increased Th17 differentiation.","method":"Id3 knockout mouse, TGF-β1 stimulation, Foxp3 promoter reporter, ChIP (E2A and GATA-3 binding), in vitro Th17 differentiation, asthma model","journal":"Nature Immunology","confidence":"High","confidence_rationale":"Tier 1/2 — KO mouse with ChIP and promoter reporter establishing two distinct TGF-β-dependent mechanisms","pmids":["21131965"],"is_preprint":false},{"year":2010,"finding":"In promoters of BMP target genes, BMP2 signals via BMPR2, BMPR1A (ALK3), and intracellular SMADs 1 and 5 to stimulate Id3 transcription; a novel proximal 6-bp cis-element and a more distal enhancer both mediate BMP2/SMAD-dependent Id3 transcription; a specific DNA-binding protein complex binds the proximal element.","method":"Quantitative RT-PCR, promoter-reporter analysis, overexpression and RNA interference of receptors and SMADs, EMSA","journal":"Molecular and Cellular Endocrinology","confidence":"High","confidence_rationale":"Tier 1/2 — RNAi + promoter reporter + EMSA defining BMP2 receptor-Smad-Id3 cis-regulatory mechanism","pmids":["21056086"],"is_preprint":false},{"year":2011,"finding":"Id3-high CD8+ T cells are precursors of long-lived memory cells, identifiable before peak expansion; Id2 and Id3 deficiency each cause loss of distinct effector and memory CD8+ T cell subsets; cytokines differentially regulate Id2 and Id3 expression, demonstrating unique roles for each inhibitor of E-protein transcription factors in effector-memory fate decisions.","method":"Id2/Id3 reporter knock-in mice, Id2 and Id3 knockout mice, flow cytometry, cytokine treatment","journal":"Nature Immunology","confidence":"High","confidence_rationale":"Tier 2 — reporter mice plus separate KO mice with paired companion paper replicating findings","pmids":["22057289"],"is_preprint":false},{"year":2011,"finding":"Id3 expression beyond the pre-TCR checkpoint enforces the naive T cell fate by antagonizing E2A activity; Id3-deficient thymi show aberrant effector-memory cell development and increased CXCR5/Bcl-6 expression; genome-wide ChIP-seq shows E2A promotes T lineage specification and pre-TCR signaling reshapes E2A genome-wide occupancy.","method":"Id3 knockout mouse, ChIP-seq (E2A genome-wide occupancy), flow cytometry, immunohistology","journal":"Nature Immunology","confidence":"High","confidence_rationale":"Tier 1/2 — genome-wide ChIP-seq with KO phenotype, defining E2A occupancy changes downstream of TCR","pmids":["21857655"],"is_preprint":false},{"year":2011,"finding":"EGFR signals through AKT-mediated direct phosphorylation of Smad5 to induce ID3 expression in glioblastoma; ID3 alone confers glioma stem-like cell features to primary astrocytes from Ink4a/Arf-deficient mice; the EGFR-ID3-IL-6 signaling axis drives tumor cell heterogeneity.","method":"EGFR inhibitor treatment, Smad5 phosphorylation assay (AKT-Smad5 direct phosphorylation), Id3 overexpression in primary astrocytes, tumorsphere assay, cytokine ELISA","journal":"Cancer Research","confidence":"Medium","confidence_rationale":"Tier 2 — direct phosphorylation assay plus gain-of-function in primary cells, single lab","pmids":["21975932"],"is_preprint":false},{"year":2012,"finding":"ID1 and ID3 together govern colon cancer-initiating cell self-renewal through cell-cycle restriction driven by the CDK inhibitor p21; ID1/ID3 silencing prevents accumulation of excess DNA damage and functional exhaustion of cancer-initiating cells.","method":"siRNA knockdown of ID1 and ID3, serial transplantation assay, p21 expression analysis, DNA damage assay","journal":"Cancer Cell","confidence":"Medium","confidence_rationale":"Tier 2 — dual knockdown with specific functional readout and defined molecular target (p21), single lab","pmids":["22698403"],"is_preprint":false},{"year":2012,"finding":"Id3 mediates atheroprotective B-cell homing to the aorta through the chemokine receptor CCR6; loss of Id3 reduces aortic B cells without affecting peripheral B cell numbers; transferred Id3-/- B cells fail to home to the aorta and cannot inhibit atherosclerosis; Id3 regulates CCR6 expression as an identified target.","method":"Id3 KO crossed to ApoE-/- mice, adoptive B cell transfer, flow cytometry, atherosclerosis quantification","journal":"Circulation Research","confidence":"High","confidence_rationale":"Tier 2 — KO mouse with adoptive transfer establishing cell-intrinsic mechanism and identifying CCR6 as Id3 target","pmids":["22034493"],"is_preprint":false},{"year":2012,"finding":"Id3 represses VCAM-1 expression by inhibiting E12 binding to the VCAM-1 promoter; ChIP demonstrates E12 interaction with the VCAM-1 promoter that is inhibited by Id3; gain and loss of function in primary VSMCs identifies Id3 as a repressor of VCAM-1 promoter activation.","method":"ChIP, VCAM-1 promoter reporter assay, Id3 gain/loss of function in primary VSMCs, Id3 KO mice","journal":"Arteriosclerosis Thrombosis and Vascular Biology","confidence":"High","confidence_rationale":"Tier 1/2 — ChIP plus reporter assay plus KO confirmation establishing E12-VCAM-1 promoter mechanism","pmids":["23042815"],"is_preprint":false},{"year":2012,"finding":"ID3 promotes cell-cycle progression in pancreatic duct cells and is sufficient to trigger cell-cycle entry (Ki67, phospho-cyclin E, phospho-histone H3) when expressed via adenovirus in primary human pancreatic duct cells; in β-cells Id3 similarly represses p57(Kip2) but instead of S-phase entry induces a DNA damage response (γH2AX, 53BP1 relocalization).","method":"Adenoviral Id3 expression, Ki67/pH3/phospho-cyclin E immunostaining, BrdU incorporation, γH2AX/53BP1 immunostaining","journal":"Molecular Cancer Research / Islets","confidence":"Medium","confidence_rationale":"Tier 2 — adenoviral OE in primary human cells with multiple proliferation/DNA damage markers, single lab","pmids":["21498546","21964314"],"is_preprint":false},{"year":2014,"finding":"Id2 and Id3 expression in regulatory T cells is required to suppress fatal inflammatory disease; TCR-driven signaling initially decreases Id3 abundance to activate a follicular regulatory T cell transcriptional signature; sustained loss of Id2 and Id3 impairs proper development, maintenance, and localization of Treg cells.","method":"Conditional Id2/Id3 deletion in Treg cells, flow cytometry, gene expression profiling","journal":"Nature Immunology","confidence":"High","confidence_rationale":"Tier 2 — conditional KO with specific in vivo phenotype and transcriptional characterization","pmids":["24973820"],"is_preprint":false},{"year":2015,"finding":"Id3 regulates Th9/IL-9 production: TGF-β1 and IL-4 downregulate Id3 expression through the kinase TAK1; reduced Id3 enhances binding of E2A and GATA-3 to the Il9 promoter, promoting IL-9 transcription; Id3 deletion increases IL-9 production in vitro and in human CD4+ T cells, and ID3-mediated control regulates anti-tumor immunity in vivo.","method":"Id3 KO mouse, TAK1 inhibition, ChIP (E2A/GATA-3 binding to Il9 promoter), reporter assay, in vivo melanoma model","journal":"Nature Immunology","confidence":"High","confidence_rationale":"Tier 1/2 — ChIP plus KO mouse plus reporter assay establishing TAK1-Id3-E2A-GATA-3 pathway","pmids":["26322481"],"is_preprint":false},{"year":2015,"finding":"Genetic depletion of Id3 reduces astrocyte generation from adult SVZ neural stem/precursor cells after traumatic brain injury; BMP-2 induces Id3 in the SVZ stem cell niche; Id3-deficient NSPCs cannot differentiate into BMP-2-induced astrocytes, whereas NSPCs deficient for E47 (the Id3-controlled target) readily differentiate into astrocytes without BMP-2, establishing Id3 as the BMP-2-induced regulator that promotes NSPC-to-astrocyte differentiation by restraining E47.","method":"Id3 KO mouse, cortical brain injury model, BMP-2 treatment, NSPC culture, E47 conditional KO, astrocyte differentiation assay, gene expression profiling","journal":"EMBO Journal","confidence":"High","confidence_rationale":"Tier 2 — two complementary KO models (Id3 and E47) with in vivo injury model, multiple orthogonal readouts","pmids":["26438726"],"is_preprint":false},{"year":2016,"finding":"Down-regulation of Id3 in B cells is essential for releasing E2A and E2-2 (acting redundantly) required for antigen-induced B cell differentiation into germinal center and plasma cells; Id3 down-regulation controls expression of Blimp1, Xbp1, and CXCR4 and is therefore critical for establishing the transcriptional network governing GC B cell and plasma cell differentiation.","method":"Id3 KO and inducible KO in B cells, flow cytometry, immunization, gene expression analysis","journal":"Journal of Experimental Medicine","confidence":"High","confidence_rationale":"Tier 2 — conditional KO with specific GC/plasma cell phenotype and defined downstream targets","pmids":["27217539"],"is_preprint":false},{"year":2016,"finding":"High E47 activity in Treg cells leads to unstable Foxp3 expression; Id3 restricts E47 activity to maintain Foxp3 transcription; E47 activates Spi-B and SOCS3, which downregulate Foxp3; Id3-deficient or E47-overexpressing Treg cells lose Foxp3 expression in vivo and in vitro, establishing an Id3-E47-Spi-B/SOCS3-Foxp3 regulatory axis.","method":"Id3 KO Treg cells, E47 retroviral overexpression, Foxp3 reporter, gene expression analysis, in vivo/in vitro Treg stimulation","journal":"Cell Reports","confidence":"High","confidence_rationale":"Tier 2 — KO and OE with defined molecular pathway from Id3 through E47 to Spi-B/SOCS3 and Foxp3","pmids":["27974197"],"is_preprint":false},{"year":2017,"finding":"ATM phosphorylates ID3 at serine 65 within the HLH motif in response to DNA double-strand breaks; phosphorylated ID3 directly interacts with MDC1; ID3 depletion impairs ionizing radiation-induced MDC1 foci formation, suppresses γ-H2AX-bound MDC1, impairs DSB repair, and causes genomic instability; disruption of the MDC1-ID3 interaction prevents MDC1 accumulation at DNA damage sites.","method":"Co-IP, in vitro interaction assay, ATM kinase assay, IR-induced foci assay, γ-H2AX ChIP, comet assay, siRNA knockdown","journal":"Nature Communications","confidence":"High","confidence_rationale":"Tier 1/2 — in vitro kinase assay plus direct interaction assay plus multiple DNA damage repair readouts, mechanistically rigorous single study","pmids":["29026069"],"is_preprint":false},{"year":2017,"finding":"ANGPTL4 binds cadherin-11, releasing membrane-bound β-catenin which translocates to the nucleus and transcriptionally upregulates ID3; ID3 then interacts with scleraxis (a bHLH transcription factor) to inhibit scar-associated collagen type 1α2 and 3α1 production by fibroblasts.","method":"ANGPTL4 treatment, β-catenin nuclear fractionation, ID3 promoter reporter, co-IP (ID3-scleraxis), siRNA, collagen gene expression","journal":"Scientific Reports","confidence":"Medium","confidence_rationale":"Tier 2 — co-IP plus reporter assay establishing ANGPTL4-cadherin11-β-catenin-ID3-scleraxis pathway, single lab","pmids":["28740178"],"is_preprint":false},{"year":2018,"finding":"CD5L promotes M2 macrophage polarization through an autophagy-dependent mechanism: CD5L increases LC3-II and lysosome colocalization; siRNA targeting ATG7 blocks CD5L-induced ID3 upregulation (and downstream CD163/MerTK expression/efferocytosis); ID3 silencing reverses CD5L-induced M2 polarization, establishing an autophagy (ATG7)-ID3 axis in macrophage polarization.","method":"siRNA (ATG7, ID3), flow cytometry, RT-qPCR, gene expression profiling (THP1), LC3-II immunostaining","journal":"Frontiers in Immunology","confidence":"Medium","confidence_rationale":"Tier 2 — siRNA epistasis establishing autophagy-ID3 pathway, 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; this mechanism underlies ID3-promoted stemness in intrahepatic cholangiocarcinoma.","method":"Co-IP (ID3-E47), ChIP (E47 binding to β-catenin promoter), reporter assay, Wnt/β-catenin pathway analysis, sphere and xenograft assays","journal":"Hepatology","confidence":"Medium","confidence_rationale":"Tier 2 — co-IP plus ChIP demonstrating E47 displacement from β-catenin promoter, single lab","pmids":["30520117"],"is_preprint":false},{"year":2024,"finding":"The lineage-determining factor ID3 in Kupffer cells controls the macrophage inhibitory/activating receptor balance by buffering binding of transcription factors ELK1 and E2A at the SIRPA locus, shifting phagocytic activity and lymphoid effector recruitment; loss- and gain-of-function experiments demonstrate ID3 is sufficient to confer anti-tumor activity to bone-marrow-derived macrophages and human iPSC-derived macrophages.","method":"Loss- and gain-of-function in mouse and human macrophages, ChIP/ATAC at SIRPA locus (ELK1/E2A binding), tumor phagocytosis assay, NK/CD8 T cell recruitment assay","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1/2 — mechanistic identification of ELK1/E2A buffering at SIRPA with multiple orthogonal functional assays in two species","pmids":["38326607"],"is_preprint":false}],"current_model":"ID3 is a dominant-negative HLH protein that lacks a DNA-binding domain and functions primarily by heterodimerizing with E-proteins (E12, E47, E2-2, HEB) and other bHLH factors to prevent their DNA binding; its activity is regulated by Cdk2-dependent phosphorylation at Ser5 (which neutralizes its bHLH-sequestration function during late G1-S) and ATM-dependent phosphorylation at Ser65 (which enables recruitment of the DNA damage mediator MDC1 to double-strand breaks); ID3 transcription is induced downstream of Ras-ERK-MAPK, TGF-β/BMP-Smad, EGFR-AKT-Smad5, and Wnt/β-catenin signaling, and is directly repressed by Blimp-1 and MeCP2; through E-protein inhibition, ID3 governs cell-cycle progression (suppressing p21, p27, p57), controls lineage fate decisions in lymphoid, myeloid, neuronal, and vascular cells, maintains Foxp3 expression in regulatory T cells via an Id3-E47-Spi-B/SOCS3 axis, promotes anti-tumor activity in Kupffer cells by buffering ELK1/E2A at the SIRPA locus, and is itself degraded via COP9 signalosome-regulated ubiquitination."},"narrative":{"teleology":[{"year":1996,"claim":"Establishing ID3 as a dominant-negative HLH protein: the question of how ID3 blocks differentiation was answered by showing it forms non-functional dimers with myogenic bHLH factors and E-proteins, preventing their DNA binding, with both HLH and C-terminal domains required.","evidence":"Stable overexpression, antisense knockdown, EMSA, domain mutagenesis in myoblasts; yeast two-hybrid, co-IP, reporter assays for E12/E47/ALF1 interactions","pmids":["8853903","8853902","8759016"],"confidence":"High","gaps":["Structural basis of ID3-E-protein dimer selectivity unknown","In vivo relevance of C-terminal domain contribution not tested"]},{"year":1997,"claim":"Discovery that Cdk2 phosphorylation at Ser5 acts as a cell-cycle-coupled switch to neutralize ID3's bHLH-sequestration function during G1/S, resolving how ID3 activity is temporally restricted.","evidence":"In vitro kinase assay with cyclin E/A-Cdk2, phospho-mimetic and phospho-ablating mutagenesis, EMSA, fibroblast S-phase entry assay","pmids":["9372912"],"confidence":"High","gaps":["Phosphatase(s) that reverse Ser5 phosphorylation unidentified","Whether Ser5 phosphorylation affects ID3 stability in vivo not addressed"]},{"year":1998,"claim":"Demonstration that ID3 selectively targets E2A/E47 over other bHLH factors in hematopoietic cells, explaining how ID3 shifts TAL1/E-protein dimer composition to promote erythroid differentiation.","evidence":"Retroviral overexpression in K562 cells, EMSA, Gal4-VP16 two-hybrid competition, E-box reporter","pmids":["9525934"],"confidence":"High","gaps":["Basis of E2A selectivity over other bHLH partners not structurally resolved","Relevance to primary erythroid progenitors not shown"]},{"year":1999,"claim":"Genetic ablation revealed non-redundant in vivo roles: Id3 KO impaired BCR-induced B-cell proliferation, while Id1/Id3 double KO caused premature neuronal differentiation, vascular malformations, and failure to support tumor angiogenesis, establishing ID3 as essential for both lymphocyte and neural/vascular development.","evidence":"Id3 KO and Id1/Id3 double KO mice, BCR cross-linking, retroviral rescue, tumor xenograft, histology","pmids":["10454544","10537105"],"confidence":"High","gaps":["Degree of functional redundancy between Id1 and Id3 in each tissue not fully resolved","Specific E-protein targets downstream in vascular endothelium not identified"]},{"year":2000,"claim":"Id3 was shown to be required for thymocyte positive and negative selection through genetic epistasis with E2A, and to act as a lineage-fate switch between DC2/T/B versus NK fates, establishing its central role in T cell development and innate-adaptive lineage decisions.","evidence":"Id3 KO mice with MHC class I/II selection assays, E2A epistasis; retroviral OE in CD34+ progenitors, flow cytometry","pmids":["10661402","11120774"],"confidence":"High","gaps":["Direct transcriptional targets of E2A that mediate positive selection not identified at this stage","Whether Id3 and Id2 act redundantly in DC2 suppression not resolved"]},{"year":2001,"claim":"Two studies placed ID3 within defined signaling pathways: TCR signaling through Ras-ERK rapidly induces Id3 to lower E2A DNA binding in thymocytes, and TGF-β induces Id3 to mediate growth arrest and apoptosis in lymphocyte progenitors, establishing ID3 as a convergent effector of mitogenic and cytokine signals.","evidence":"Primary thymocytes with TCR ligation and ERK inhibitor, EMSA, RT-PCR; Id3 KO lymphocyte progenitors with TGF-β treatment and apoptosis assay","pmids":["11175815","11224524"],"confidence":"High","gaps":["Whether ERK phosphorylates Id3 promoter-associated factors directly not shown","Transcription factors mediating TGF-β induction of Id3 not identified at this point"]},{"year":2002,"claim":"ID3 was linked to vascular disease: angiotensin II induces Id3 via superoxide in VSMCs, where Id3 represses p21/p27/p53 and drives proliferation, extending ID3's role beyond immune cells to cardiovascular pathology.","evidence":"Antisense and sense-Id3 transfection in VSMCs, SOD/catalase treatment, Western blot, DNA synthesis assay","pmids":["12021231"],"confidence":"Medium","gaps":["Direct versus indirect mechanism of superoxide-mediated Id3 induction not resolved","Relevance to human vascular disease at this point correlative"]},{"year":2004,"claim":"Multiple mechanisms controlling ID3 were delineated: COP9 signalosome (CSN5/CSN7) physically interacts with ID3 to regulate its ubiquitination and proteasomal degradation; a dominant-negative intron-retention isoform (Id3a) was discovered that inhibits VSMC growth and promotes apoptosis in vivo; and Id3-deficient mice develop Sjögren's syndrome-like autoimmune disease through a T cell-intrinsic mechanism.","evidence":"Mammalian two-hybrid, pull-down, ubiquitination assay, proteasome inhibitors; Id3a adenoviral delivery in balloon-injured rat carotid; Id3 KO with adoptive transfer and neonatal thymectomy","pmids":["15451666","15159391","15485632"],"confidence":"High","gaps":["E3 ligase that ubiquitinates ID3 not identified","Regulation of Id3a splicing switch not characterized","Whether Sjögren's phenotype involves Treg dysfunction specifically not yet tested"]},{"year":2005,"claim":"Cell-type-specific apoptotic mechanisms downstream of ID3 were dissected: in keratinocytes, ID3 triggers Bax-mediated mitochondrial caspase-9/3 apoptosis (relevant to UVB response), while in B lymphocyte progenitors it activates p53-independent caspase-2-dependent apoptosis.","evidence":"Overexpression and siRNA in keratinocytes with DN-caspase-9/Bcl-2 rescue; retroviral Id3 in B progenitors with caspase-2 assay, p53-null and Bcl-2-OE controls","pmids":["16449966","16177095"],"confidence":"High","gaps":["Whether E-protein sequestration directly triggers each apoptotic pathway or acts indirectly not resolved","Upstream signal selecting between caspase-2 vs caspase-9 pathway unknown"]},{"year":2006,"claim":"MeCP2 was identified as a direct transcriptional repressor of ID3: ChIP showed MeCP2 binding at the ID3 promoter, and MeCP2 loss (including Rett syndrome brain) leads to elevated ID3, linking ID3 dysregulation to neurodevelopmental disease.","evidence":"ChIP, genome-wide expression microarray, qRT-PCR in mouse and human Rett syndrome brain","pmids":["16682435"],"confidence":"High","gaps":["Whether elevated ID3 contributes causally to Rett syndrome phenotypes not tested","Mechanism of MeCP2-mediated repression (methylation-dependent vs independent) at Id3 promoter not dissected"]},{"year":2007,"claim":"The mechanism by which ID3 represses p27 was resolved: ID3 inhibits ELK1 at the p27 promoter (confirmed by ChIP), blocking transcription and enabling G1/S transition, revealing a non-E-protein partner interaction.","evidence":"siRNA, ChIP (Id3-ELK1 at p27 promoter), reporter assay, flow cytometry in VSMCs","pmids":["17404577"],"confidence":"High","gaps":["Whether ID3-ELK1 interaction is direct or bridged by an intermediary not fully established","Generalizability of ELK1 mechanism beyond VSMCs not tested"]},{"year":2008,"claim":"Two new regulatory circuits were identified: ID3 inhibits E47-mediated adiponectin transcription (with Id3-null mice showing elevated serum adiponectin), and RhoA/ROCK-MRTF-A-Smad1/4 complex activates Id3 transcription in myoblasts, with a forkhead factor suppressing this axis during differentiation.","evidence":"ChIP in vitro and in Id3-null adipose tissue, reporter assay, promoter mutagenesis; co-IP of MRTF-A/Smad, Id3 promoter reporter with RhoA/ROCK inhibition","pmids":["18669923","18477564"],"confidence":"High","gaps":["Identity of the forkhead factor that suppresses Id3 during differentiation not specified","Whether ID3 regulation of adiponectin contributes to metabolic disease in vivo not tested"]},{"year":2010,"claim":"ID3 was established as critical for both CD8+ memory T cell persistence and Foxp3+ Treg generation: Blimp-1 directly represses Id3 in short-lived effector cells to limit memory formation, while TGF-β-induced Id3 is required to relieve GATA-3-mediated Foxp3 promoter inhibition and promote Treg differentiation.","evidence":"ChIP (Blimp-1 at Id3 promoter), retroviral OE, Id3 KO memory phenotype; Id3 KO Treg, Foxp3 reporter, ChIP (E2A/GATA-3 at Foxp3 promoter), Th17 assay; BMP2-SMAD-Id3 cis-element mapping","pmids":["22057288","21131965","21056086"],"confidence":"High","gaps":["Whether Blimp-1 repression of Id3 is sufficient or requires additional factors not resolved","Precise stoichiometric relationship between Id3 and GATA-3 at Foxp3 locus not quantified"]},{"year":2011,"claim":"Genome-wide and lineage studies showed that Id3-high cells are precursors of long-lived CD8+ memory T cells, Id3 enforces the naïve T cell fate by antagonizing genome-wide E2A occupancy at effector loci, and EGFR-AKT-Smad5 signaling induces ID3 in glioblastoma to confer stem-like properties.","evidence":"Id3 reporter knock-in and KO mice with flow cytometry; E2A ChIP-seq in Id3-deficient thymi; EGFR inhibitor, AKT-Smad5 phosphorylation assay, tumorsphere assay","pmids":["22057289","21857655","21975932"],"confidence":"High","gaps":["Signals that determine Id3-high vs Id3-low bifurcation at early effector stage not fully characterized","Whether EGFR-AKT-Smad5-ID3 axis operates in normal neural stem cells not tested"]},{"year":2012,"claim":"ID3 was integrated into cardiovascular and cancer biology: it mediates atheroprotective B-cell homing via CCR6, represses VCAM-1 through inhibition of E12 at the VCAM-1 promoter, cooperates with ID1 to govern colon cancer-initiating cell self-renewal through p21, and drives cell-cycle entry in pancreatic duct cells while paradoxically triggering DNA damage in β-cells.","evidence":"Id3 KO × ApoE-/- mice with adoptive B cell transfer; ChIP and reporter at VCAM-1 promoter in VSMCs; siRNA of ID1/ID3 with serial transplantation; adenoviral Id3 in primary human pancreatic cells with Ki67/γH2AX","pmids":["22034493","23042815","22698403","21498546"],"confidence":"High","gaps":["How Id3 regulates CCR6 transcription mechanistically not detailed","Whether p21-dependent self-renewal mechanism is specific to colon cancer or generalizable not tested","Why β-cells respond to Id3 with DNA damage rather than proliferation not explained"]},{"year":2014,"claim":"Conditional deletion demonstrated that Id2 and Id3 together are essential in Tregs to suppress fatal inflammation, with TCR signaling initially decreasing Id3 to activate a follicular regulatory T cell program.","evidence":"Conditional Id2/Id3 deletion in Foxp3+ Tregs, flow cytometry, gene expression profiling","pmids":["24973820"],"confidence":"High","gaps":["Individual contributions of Id2 versus Id3 in Treg maintenance not fully separated","Whether follicular Treg signature depends on specific E-protein targets not determined"]},{"year":2015,"claim":"Two new regulatory axes were defined: TAK1-mediated Id3 downregulation enables E2A/GATA-3 binding at the Il9 promoter to control Th9 anti-tumor immunity, and BMP-2-induced Id3 in neural stem cells promotes astrocyte differentiation by restraining E47, as confirmed by complementary E47 KO.","evidence":"Id3 KO with TAK1 inhibition, ChIP at Il9 promoter, melanoma model; Id3 KO and E47 conditional KO mice, cortical injury model, NSPC culture","pmids":["26322481","26438726"],"confidence":"High","gaps":["Whether TAK1 phosphorylates a specific Id3 degradation pathway not characterized","How Id3/E47 balance integrates with other astrogliogenic signals (e.g. Notch, LIF) unknown"]},{"year":2016,"claim":"Two studies established ID3 as a gatekeeper of B cell and Treg transcriptional programs: Id3 downregulation releases E2A/E2-2 to activate Blimp1/Xbp1/CXCR4 for GC/plasma cell differentiation, and an Id3–E47–Spi-B/SOCS3–Foxp3 axis was fully delineated for Treg stability.","evidence":"Conditional Id3 KO in B cells with immunization, flow cytometry, gene expression; Id3 KO Tregs, E47 retroviral OE, Foxp3 reporter","pmids":["27217539","27974197"],"confidence":"High","gaps":["Whether E2A and E2-2 have non-overlapping roles in GC vs plasma cell fate not resolved","Therapeutic potential of modulating Id3-E47 axis for autoimmune Treg instability not tested"]},{"year":2017,"claim":"A DNA-damage-independent function was uncovered: ATM phosphorylates ID3 at Ser65, enabling direct interaction with MDC1 and recruitment to DSB sites; ID3 depletion causes impaired DSB repair and genomic instability, establishing ID3 as a component of the DNA damage response. Separately, a Wnt/β-catenin-ID3 axis through ANGPTL4-cadherin-11 was identified in wound healing.","evidence":"ATM kinase assay, co-IP (ID3-MDC1), IR-induced foci, γH2AX ChIP, comet assay; ANGPTL4 treatment, β-catenin fractionation, co-IP (ID3-scleraxis), collagen gene analysis","pmids":["29026069","28740178"],"confidence":"High","gaps":["Whether Ser65 phosphorylation and Ser5 phosphorylation are coordinated is unknown","Whether ID3-MDC1 interaction requires the HLH domain or a distinct surface not mapped","ANGPTL4-ID3-scleraxis pathway awaits independent confirmation"]},{"year":2019,"claim":"ID3 was shown to activate Wnt/β-catenin signaling in cholangiocarcinoma by blocking E47 recruitment to the β-catenin promoter, thereby promoting cancer stemness.","evidence":"Co-IP (ID3-E47), ChIP (E47 at β-catenin promoter), reporter assay, sphere and xenograft assays","pmids":["30520117"],"confidence":"Medium","gaps":["Whether this mechanism operates in normal cholangiocytes not tested","Generalizability beyond cholangiocarcinoma not established"]},{"year":2024,"claim":"ID3 was identified as the lineage-determining factor in Kupffer cells that controls anti-tumor immunity by buffering ELK1 and E2A transcription factor occupancy at the SIRPA locus, shifting the inhibitory/activating receptor balance to promote phagocytosis and lymphoid effector recruitment.","evidence":"Loss- and gain-of-function in mouse and human macrophages, ChIP/ATAC at SIRPA locus, tumor phagocytosis assay, NK/CD8 T cell recruitment","pmids":["38326607"],"confidence":"High","gaps":["Whether ID3-dependent SIRPA regulation extends to other tissue-resident macrophages not tested","Upstream signals maintaining Id3 expression specifically in Kupffer cells not fully defined"]},{"year":null,"claim":"Key unresolved questions include the identity of the E3 ubiquitin ligase that targets ID3 for degradation, how Ser5 and Ser65 phosphorylation are coordinated, the structural basis for ID3's selectivity among bHLH partners, and whether the DNA damage response function of ID3 is mechanistically linked to its E-protein sequestration activity.","evidence":"","pmids":[],"confidence":"Low","gaps":["E3 ligase identity unknown","Coordination of Ser5/Ser65 phosphorylation events not studied","No crystal or cryo-EM structure of ID3 in complex with any partner"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,1,3,18,19,29,35,40]},{"term_id":"GO:0140313","term_label":"molecular sequestering activity","supporting_discovery_ids":[0,1,3,29,39]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,1,36,40]}],"pathway":[{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[2,10,18,27,30]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[4,7,9,14,21,22,24,25,31,32,34,35,40]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[8,9,20,23,26,37]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[36]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[5,6,33]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[15,16]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[17,21,29,35]}],"complexes":[],"partners":["E47","E12","E2-2","ELK1","MDC1","CSN5","GATA3","SCLERAXIS"],"other_free_text":[]},"mechanistic_narrative":"ID3 is a dominant-negative helix-loop-helix (HLH) protein that lacks a DNA-binding domain and functions as a master regulator of cell-fate decisions, cell-cycle progression, and immune homeostasis by heterodimerizing with E-proteins (E12, E47, E2-2, HEB) and other bHLH factors to sequester them from DNA [PMID:8759016, PMID:8853903]. Through E-protein inhibition, ID3 suppresses CDK inhibitors p21, p27, and p57 to drive G1/S transition, controls thymocyte positive and negative selection, maintains Foxp3 expression in regulatory T cells via an Id3–E47–Spi-B/SOCS3 axis, directs germinal center and plasma cell differentiation, and specifies Kupffer cell anti-tumor identity by buffering ELK1/E2A binding at the SIRPA locus [PMID:9372912, PMID:10661402, PMID:27974197, PMID:27217539, PMID:38326607]. ID3 activity is regulated at the transcriptional level by Ras-ERK, TGF-β/BMP-Smad, EGFR-AKT-Smad5, and Wnt/β-catenin signaling, and is directly repressed by Blimp-1 and MeCP2; post-translationally, Cdk2 phosphorylation at Ser5 neutralizes its bHLH-sequestration function during S-phase entry, ATM phosphorylation at Ser65 redirects ID3 to recruit the DNA damage mediator MDC1 to double-strand breaks, and COP9 signalosome-associated ubiquitination controls its degradation [PMID:11175815, PMID:21056086, PMID:22057288, PMID:16682435, PMID:9372912, PMID:29026069, PMID:15451666]. Loss of Id3 in mice causes defective B-cell proliferation, impaired thymocyte selection, autoimmune Sjögren's syndrome-like disease, and dysregulated regulatory T cell function, underscoring its non-redundant role in immune tolerance [PMID:10454544, PMID:15485632, PMID:21131965]."},"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":756,"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":347,"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. 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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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hybridization\",\n      \"journal\": \"Cell Growth & Differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — multiple orthogonal methods (OE, antisense KD, EMSA, domain mutagenesis) in two independent papers\",\n      \"pmids\": [\"8853903\", \"8853902\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"Id3 physically interacts with E12, E47, ALF1, and Id4 (identified by yeast two-hybrid and confirmed by co-immunoprecipitation), disrupts their DNA binding in vitro, and blocks transcriptional activation by E-proteins in cultured cells; Id3 also shows evidence of interaction with E2-2 and MyoD but not c-Myc.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation, EMSA, reporter gene assay\",\n      \"journal\": \"Nucleic Acids Research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — yeast two-hybrid plus reciprocal co-IP plus in vitro DNA-binding assay plus transcriptional reporter, single study with multiple orthogonal methods\",\n      \"pmids\": [\"8759016\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"Cyclin E-Cdk2 and cyclin A-Cdk2 phosphorylate Id3 at Ser5 during late G1-to-S phase transition; phosphorylation alters Id3 target bHLH specificity and nullifies Id3's ability to promote S-phase entry. A phosphomimetic Id3(Asp5) mutant fails to promote S-phase entry, while a phospho-ablating Id3(Ala5) mutant displays enhanced activity compared with wild-type Id3.\",\n      \"method\": \"In vitro kinase assay, site-directed mutagenesis, EMSA, reporter gene assay, transfected fibroblast proliferation assay\",\n      \"journal\": \"Molecular and Cellular Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro kinase assay with mutagenesis and functional cell-cycle readout\",\n      \"pmids\": [\"9372912\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Id3 selectively targets E2A (E47) over other bHLH proteins in non-lymphoid hematopoietic cells; enforced Id3 expression in K562 erythroid progenitors promotes erythroid differentiation by shifting the profile of TAL1/E-protein heterodimers binding to E-box sequences, as shown by band-shift assays and a Gal4-VP16 two-hybrid competition assay.\",\n      \"method\": \"Retroviral overexpression, EMSA, Gal4-VP16 two-hybrid competition, E-box reporter assay\",\n      \"journal\": \"Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — multiple orthogonal assays in a single study demonstrating selective E2A/E47 targeting\",\n      \"pmids\": [\"9525934\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Id3 deficiency in mice impairs B-cell proliferation in response to BCR cross-linking, identifying Id3 as an essential mediator of BCR-to-cell-cycle-progression signaling; the proliferation defect can be rescued by ectopic expression of Id1, demonstrating functional redundancy within the Id family.\",\n      \"method\": \"Gene knockout mouse, BCR cross-linking proliferation assay, retroviral Id1 rescue\",\n      \"journal\": \"Molecular and Cellular Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with specific cellular phenotype plus genetic rescue\",\n      \"pmids\": [\"10454544\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Targeted disruption of Id1 and Id3 together in mice causes premature neuroblast withdrawal from the cell cycle, neural differentiation marker expression, forebrain vascular malformations, and failure to support tumor xenograft growth/vascularization, establishing Id1/Id3 as required for maintaining neuronal cell-cycle timing and tumour angiogenesis.\",\n      \"method\": \"Double knockout mouse, tumor xenograft assay, histology, immunofluorescence\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean double KO with multiple specific in vivo phenotypic readouts, highly cited foundational paper\",\n      \"pmids\": [\"10537105\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Id3 (and Id2) suppress the development of CD34+ progenitors into pre-DC2 (plasmacytoid DC precursors) but not into DC1 precursors, while promoting NK cell development; this establishes Id3 as a lineage-fate switch between DC2/T/B versus NK cell fates.\",\n      \"method\": \"Retroviral ectopic expression in CD34+ progenitor culture system, flow cytometry\",\n      \"journal\": \"Journal of Experimental Medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — retroviral OE with specific lineage phenotype readout, single lab\",\n      \"pmids\": [\"11120774\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Id3 null mutation in mice abrogates MHC class I- and class II-restricted thymocyte positive selection and severely perturbs H-Y TCR-mediated negative selection; genetic interaction between E2A and Id3 in thymocyte development was demonstrated by epistasis analysis.\",\n      \"method\": \"Id3 knockout mouse, thymocyte selection assay, epistasis with E2A\",\n      \"journal\": \"Immunity\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with specific developmental phenotype and genetic epistasis\",\n      \"pmids\": [\"10661402\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Id3 is induced by TGF-β in lymphocyte progenitors and mediates TGF-β-induced apoptosis and growth arrest; in Id3-deficient progenitors the growth-suppressive and pro-apoptotic response to TGF-β is perturbed, placing Id3 downstream of TGF-β and upstream of E-protein-controlled survival.\",\n      \"method\": \"Id3 knockout mouse, TGF-β treatment, apoptosis assay, lymphocyte progenitor culture\",\n      \"journal\": \"Nature Immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — KO mouse with specific cytokine-pathway placement and apoptosis readout\",\n      \"pmids\": [\"11224524\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"TCR-mediated signaling through the ERK MAPK cascade rapidly induces Id3 transcription in a dose-dependent manner, which lowers E2A DNA-binding activity in primary thymocytes without altering E2A protein levels, directly linking the Ras-ERK pathway to HLH regulation in a linear signaling pathway.\",\n      \"method\": \"Primary thymocyte culture, TCR ligation, ERK inhibition, EMSA, RT-PCR, Western blot\",\n      \"journal\": \"Nature Immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods establishing linear pathway from ERK to Id3 to E2A\",\n      \"pmids\": [\"11175815\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Angiotensin II induces Id3 expression in vascular smooth muscle cells via superoxide production (blocked by SOD but not catalase); Id3 upregulation drives VSMC proliferation by downregulating p21(WAF1/Cip1), p27(Kip1), and p53 and causing retinoblastoma protein hyperphosphorylation; antisense Id3 abolishes all these effects.\",\n      \"method\": \"Differential display, antisense transfection, Western blot, DNA synthesis assay, sense-Id3 overexpression\",\n      \"journal\": \"Circulation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — gain and loss of function with defined molecular targets in a single lab\",\n      \"pmids\": [\"12021231\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Id3 protein is ubiquitinated and degraded by the proteasome; Id3 physically interacts with CSN5 and CSN7 subunits of the COP9 signalosome (demonstrated by mammalian two-hybrid, pull-down, and far-Western), and CSN-associated kinase inhibitors (curcumin, emodin) induce Id3 ubiquitination and degradation; CSN2 overexpression stabilizes Id3.\",\n      \"method\": \"Mammalian two-hybrid, pull-down, far-Western, His-ubiquitin co-transfection, proteasome inhibition\",\n      \"journal\": \"Journal of Molecular Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — multiple orthogonal binding assays plus direct ubiquitination demonstration\",\n      \"pmids\": [\"15451666\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Phosphorylation of Id3 in vascular smooth muscle cells provides a regulatory switch controlling Id3-induced repression of p21(Cip1) and VSMC growth, occurring both in vitro and in vivo during vascular lesion formation.\",\n      \"method\": \"Phosphorylation assay in primary VSMCs and in vivo lesion model, p21(Cip1) reporter assay\",\n      \"journal\": \"Circulation Research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo and in vitro phosphorylation with functional readout, single lab\",\n      \"pmids\": [\"15321928\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"An intron-retention isoform of Id3 (Id3a), expressed during vascular lesion formation, fails to promote smooth muscle cell growth or repress p21(Cip1) but instead stimulates SMC apoptosis and inhibits endogenous Id3 production; adenoviral Id3a delivery inhibits vascular lesion formation in balloon-injured rat carotid arteries in vivo.\",\n      \"method\": \"In vivo balloon injury model, adenoviral gene delivery, Id3a-specific antibody, proliferation/apoptosis assays, p21(Cip1) reporter assay\",\n      \"journal\": \"Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — novel isoform characterization with in vivo functional validation and multiple mechanistic readouts\",\n      \"pmids\": [\"15159391\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Id3-deficient mice develop autoimmune Sjögren's syndrome-like disease; adoptive transfer experiments demonstrate a T cell-intrinsic role for Id3, and neonatal thymectomy rescues disease symptoms, establishing that Id3 controls thymic T cell development that prevents autoimmune exocrinopathy.\",\n      \"method\": \"Id3 knockout mouse, adoptive transfer, neonatal thymectomy, histology, autoantibody assay\",\n      \"journal\": \"Immunity\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — KO with adoptive transfer and surgical rescue establishing T cell-intrinsic, thymus-dependent mechanism\",\n      \"pmids\": [\"15485632\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Id3 induces apoptosis in immortalized keratinocytes via a Bax-mediated mitochondrial caspase-9 pathway, activating caspase-3; dominant-negative caspase-9 or Bcl-2 overexpression suppresses Id3-induced apoptosis, and siRNA knockdown of Id3 abrogates UVB-induced caspase-3 activation.\",\n      \"method\": \"Overexpression, siRNA, dominant-negative caspase-9 co-transfection, Annexin V, active caspase-3/9 immunostaining\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — gain and loss of function with pathway-specific rescue experiments\",\n      \"pmids\": [\"16449966\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Id3 induces growth arrest and caspase-2-dependent apoptosis in B lymphocyte progenitors through a mechanism that does not require p53 and is not inhibited by Bcl-2; Id3 reduces expression of E-protein target genes and proliferation genes, and chemical growth arrest alone is sufficient to activate caspase-2.\",\n      \"method\": \"Retroviral Id3 expression, caspase-2 assay, p53-deficient and Bcl-2-overexpressing cells, gene expression analysis\",\n      \"journal\": \"Journal of Immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — gain of function with mechanistic dissection using specific caspase and pathway controls\",\n      \"pmids\": [\"16177095\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"MeCP2 binds near or within the promoters of ID1, ID2, and ID3 genes (confirmed by chromatin immunoprecipitation) and represses their transcription; loss of MeCP2 results in elevated ID3 expression in mouse brain and human Rett syndrome brain.\",\n      \"method\": \"Chromatin immunoprecipitation, genome-wide expression microarray, quantitative RT-PCR, immunofluorescence, laser scanning cytometry\",\n      \"journal\": \"Human Molecular Genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — ChIP demonstrating direct promoter binding with corroborating expression data in two model systems\",\n      \"pmids\": [\"16682435\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Id3 represses p27(Kip1) mRNA transcription in early G1 phase through inhibition of the transcription factor ELK1; Id3 silencing reverses injury-induced p27 downregulation, blocks pRb phosphorylation and p130 degradation, and prevents G1/S transition; Id3 interaction with ELK1 at the p27 promoter was demonstrated by ChIP.\",\n      \"method\": \"siRNA, quantitative PCR, reporter gene assay, chromatin immunoprecipitation, flow cytometry\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — siRNA knockdown with ChIP, reporter assay, and multiple cell-cycle readouts\",\n      \"pmids\": [\"17404577\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Id3 inhibits adiponectin expression by binding E47 and preventing E47-mediated potentiation of SREBP-1c-driven adiponectin promoter activation; Id3 dose-dependently inhibits E47 transcriptional activity, E47 binding to the adiponectin promoter is abolished by Id3 overexpression and enhanced in Id3-null adipose tissue (demonstrated by ChIP), and Id3-null mice show increased serum adiponectin.\",\n      \"method\": \"ChIP, reporter gene assay, Id3 overexpression and Id3-null mice, adiponectin promoter mutagenesis\",\n      \"journal\": \"Circulation Research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — ChIP in vitro and in vivo, reporter assay with mutagenesis, KO mouse confirmation\",\n      \"pmids\": [\"18669923\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"RhoA/Rho-associated kinase signaling in proliferating myoblasts activates MRTF-A, which forms a complex with Smad1/4 to strongly activate Id3 gene transcription; during differentiation, a forkhead transcription factor translocates to the nucleus and suppresses Id3 expression by preventing MRTF-A–Smad complex association with the Id3 promoter.\",\n      \"method\": \"C2C12 myoblast culture, RhoA/ROCK inhibition, MRTF-A/Smad co-IP, Id3 promoter reporter assay, forkhead factor overexpression\",\n      \"journal\": \"Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — complex formation demonstrated by co-IP, promoter reporter, and functional rescue in a defined signaling context\",\n      \"pmids\": [\"18477564\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Blimp-1 binds to and represses the Id3 promoter in short-lived effector CD8+ T cells (SLECs); this repression of Id3 limits the ability of SLECs to persist as memory cells; enforced Id3 expression restores SLEC survival and recall responses, and Id3 functions in part by inhibiting E2A transcriptional activity.\",\n      \"method\": \"ChIP (Blimp-1 binding to Id3 promoter), retroviral Id3 overexpression, Id3-/- mice, KLRG-1/memory marker analysis\",\n      \"journal\": \"Nature Immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — ChIP demonstrating direct promoter repression plus loss- and gain-of-function with defined memory phenotype\",\n      \"pmids\": [\"22057288\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Deletion of Id3 results in defective Foxp3+ regulatory T cell generation; two TGF-β1-dependent mechanisms are identified: (1) enhanced E2A binding to the Foxp3 promoter promotes Foxp3 transcription, and (2) Id3 is required to relieve GATA-3-mediated inhibition of the Foxp3 promoter; Id3-/- T cells show increased Th17 differentiation.\",\n      \"method\": \"Id3 knockout mouse, TGF-β1 stimulation, Foxp3 promoter reporter, ChIP (E2A and GATA-3 binding), in vitro Th17 differentiation, asthma model\",\n      \"journal\": \"Nature Immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — KO mouse with ChIP and promoter reporter establishing two distinct TGF-β-dependent mechanisms\",\n      \"pmids\": [\"21131965\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"In promoters of BMP target genes, BMP2 signals via BMPR2, BMPR1A (ALK3), and intracellular SMADs 1 and 5 to stimulate Id3 transcription; a novel proximal 6-bp cis-element and a more distal enhancer both mediate BMP2/SMAD-dependent Id3 transcription; a specific DNA-binding protein complex binds the proximal element.\",\n      \"method\": \"Quantitative RT-PCR, promoter-reporter analysis, overexpression and RNA interference of receptors and SMADs, EMSA\",\n      \"journal\": \"Molecular and Cellular Endocrinology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — RNAi + promoter reporter + EMSA defining BMP2 receptor-Smad-Id3 cis-regulatory mechanism\",\n      \"pmids\": [\"21056086\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Id3-high CD8+ T cells are precursors of long-lived memory cells, identifiable before peak expansion; Id2 and Id3 deficiency each cause loss of distinct effector and memory CD8+ T cell subsets; cytokines differentially regulate Id2 and Id3 expression, demonstrating unique roles for each inhibitor of E-protein transcription factors in effector-memory fate decisions.\",\n      \"method\": \"Id2/Id3 reporter knock-in mice, Id2 and Id3 knockout mice, flow cytometry, cytokine treatment\",\n      \"journal\": \"Nature Immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reporter mice plus separate KO mice with paired companion paper replicating findings\",\n      \"pmids\": [\"22057289\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Id3 expression beyond the pre-TCR checkpoint enforces the naive T cell fate by antagonizing E2A activity; Id3-deficient thymi show aberrant effector-memory cell development and increased CXCR5/Bcl-6 expression; genome-wide ChIP-seq shows E2A promotes T lineage specification and pre-TCR signaling reshapes E2A genome-wide occupancy.\",\n      \"method\": \"Id3 knockout mouse, ChIP-seq (E2A genome-wide occupancy), flow cytometry, immunohistology\",\n      \"journal\": \"Nature Immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — genome-wide ChIP-seq with KO phenotype, defining E2A occupancy changes downstream of TCR\",\n      \"pmids\": [\"21857655\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"EGFR signals through AKT-mediated direct phosphorylation of Smad5 to induce ID3 expression in glioblastoma; ID3 alone confers glioma stem-like cell features to primary astrocytes from Ink4a/Arf-deficient mice; the EGFR-ID3-IL-6 signaling axis drives tumor cell heterogeneity.\",\n      \"method\": \"EGFR inhibitor treatment, Smad5 phosphorylation assay (AKT-Smad5 direct phosphorylation), Id3 overexpression in primary astrocytes, tumorsphere assay, cytokine ELISA\",\n      \"journal\": \"Cancer Research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct phosphorylation assay plus gain-of-function in primary cells, single lab\",\n      \"pmids\": [\"21975932\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"ID1 and ID3 together govern colon cancer-initiating cell self-renewal through cell-cycle restriction driven by the CDK inhibitor p21; ID1/ID3 silencing prevents accumulation of excess DNA damage and functional exhaustion of cancer-initiating cells.\",\n      \"method\": \"siRNA knockdown of ID1 and ID3, serial transplantation assay, p21 expression analysis, DNA damage assay\",\n      \"journal\": \"Cancer Cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — dual knockdown with specific functional readout and defined molecular target (p21), single lab\",\n      \"pmids\": [\"22698403\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Id3 mediates atheroprotective B-cell homing to the aorta through the chemokine receptor CCR6; loss of Id3 reduces aortic B cells without affecting peripheral B cell numbers; transferred Id3-/- B cells fail to home to the aorta and cannot inhibit atherosclerosis; Id3 regulates CCR6 expression as an identified target.\",\n      \"method\": \"Id3 KO crossed to ApoE-/- mice, adoptive B cell transfer, flow cytometry, atherosclerosis quantification\",\n      \"journal\": \"Circulation Research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — KO mouse with adoptive transfer establishing cell-intrinsic mechanism and identifying CCR6 as Id3 target\",\n      \"pmids\": [\"22034493\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Id3 represses VCAM-1 expression by inhibiting E12 binding to the VCAM-1 promoter; ChIP demonstrates E12 interaction with the VCAM-1 promoter that is inhibited by Id3; gain and loss of function in primary VSMCs identifies Id3 as a repressor of VCAM-1 promoter activation.\",\n      \"method\": \"ChIP, VCAM-1 promoter reporter assay, Id3 gain/loss of function in primary VSMCs, Id3 KO mice\",\n      \"journal\": \"Arteriosclerosis Thrombosis and Vascular Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — ChIP plus reporter assay plus KO confirmation establishing E12-VCAM-1 promoter mechanism\",\n      \"pmids\": [\"23042815\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"ID3 promotes cell-cycle progression in pancreatic duct cells and is sufficient to trigger cell-cycle entry (Ki67, phospho-cyclin E, phospho-histone H3) when expressed via adenovirus in primary human pancreatic duct cells; in β-cells Id3 similarly represses p57(Kip2) but instead of S-phase entry induces a DNA damage response (γH2AX, 53BP1 relocalization).\",\n      \"method\": \"Adenoviral Id3 expression, Ki67/pH3/phospho-cyclin E immunostaining, BrdU incorporation, γH2AX/53BP1 immunostaining\",\n      \"journal\": \"Molecular Cancer Research / Islets\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — adenoviral OE in primary human cells with multiple proliferation/DNA damage markers, single lab\",\n      \"pmids\": [\"21498546\", \"21964314\"],\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 initially decreases Id3 abundance to activate a follicular regulatory T cell transcriptional signature; sustained loss of Id2 and Id3 impairs proper development, maintenance, and localization of Treg cells.\",\n      \"method\": \"Conditional Id2/Id3 deletion in Treg cells, flow cytometry, gene expression profiling\",\n      \"journal\": \"Nature Immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with specific in vivo phenotype and transcriptional characterization\",\n      \"pmids\": [\"24973820\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Id3 regulates Th9/IL-9 production: TGF-β1 and IL-4 downregulate Id3 expression through the kinase TAK1; reduced Id3 enhances binding of E2A and GATA-3 to the Il9 promoter, promoting IL-9 transcription; Id3 deletion increases IL-9 production in vitro and in human CD4+ T cells, and ID3-mediated control regulates anti-tumor immunity in vivo.\",\n      \"method\": \"Id3 KO mouse, TAK1 inhibition, ChIP (E2A/GATA-3 binding to Il9 promoter), reporter assay, in vivo melanoma model\",\n      \"journal\": \"Nature Immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — ChIP plus KO mouse plus reporter assay establishing TAK1-Id3-E2A-GATA-3 pathway\",\n      \"pmids\": [\"26322481\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Genetic depletion of Id3 reduces astrocyte generation from adult SVZ neural stem/precursor cells after traumatic brain injury; BMP-2 induces Id3 in the SVZ stem cell niche; Id3-deficient NSPCs cannot differentiate into BMP-2-induced astrocytes, whereas NSPCs deficient for E47 (the Id3-controlled target) readily differentiate into astrocytes without BMP-2, establishing Id3 as the BMP-2-induced regulator that promotes NSPC-to-astrocyte differentiation by restraining E47.\",\n      \"method\": \"Id3 KO mouse, cortical brain injury model, BMP-2 treatment, NSPC culture, E47 conditional KO, astrocyte differentiation assay, gene expression profiling\",\n      \"journal\": \"EMBO Journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — two complementary KO models (Id3 and E47) with in vivo injury model, multiple orthogonal readouts\",\n      \"pmids\": [\"26438726\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Down-regulation of Id3 in B cells is essential for releasing E2A and E2-2 (acting redundantly) required for antigen-induced B cell differentiation into germinal center and plasma cells; Id3 down-regulation controls expression of Blimp1, Xbp1, and CXCR4 and is therefore critical for establishing the transcriptional network governing GC B cell and plasma cell differentiation.\",\n      \"method\": \"Id3 KO and inducible KO in B cells, flow cytometry, immunization, gene expression analysis\",\n      \"journal\": \"Journal of Experimental Medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with specific GC/plasma cell phenotype and defined downstream targets\",\n      \"pmids\": [\"27217539\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"High E47 activity in Treg cells leads to unstable Foxp3 expression; Id3 restricts E47 activity to maintain Foxp3 transcription; E47 activates Spi-B and SOCS3, which downregulate Foxp3; Id3-deficient or E47-overexpressing Treg cells lose Foxp3 expression in vivo and in vitro, establishing an Id3-E47-Spi-B/SOCS3-Foxp3 regulatory axis.\",\n      \"method\": \"Id3 KO Treg cells, E47 retroviral overexpression, Foxp3 reporter, gene expression analysis, in vivo/in vitro Treg stimulation\",\n      \"journal\": \"Cell Reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — KO and OE with defined molecular pathway from Id3 through E47 to Spi-B/SOCS3 and Foxp3\",\n      \"pmids\": [\"27974197\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"ATM phosphorylates ID3 at serine 65 within the HLH motif in response to DNA double-strand breaks; phosphorylated ID3 directly interacts with MDC1; ID3 depletion impairs ionizing radiation-induced MDC1 foci formation, suppresses γ-H2AX-bound MDC1, impairs DSB repair, and causes genomic instability; disruption of the MDC1-ID3 interaction prevents MDC1 accumulation at DNA damage sites.\",\n      \"method\": \"Co-IP, in vitro interaction assay, ATM kinase assay, IR-induced foci assay, γ-H2AX ChIP, comet assay, siRNA knockdown\",\n      \"journal\": \"Nature Communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — in vitro kinase assay plus direct interaction assay plus multiple DNA damage repair readouts, mechanistically rigorous single study\",\n      \"pmids\": [\"29026069\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"ANGPTL4 binds cadherin-11, releasing membrane-bound β-catenin which translocates to the nucleus and transcriptionally upregulates ID3; ID3 then interacts with scleraxis (a bHLH transcription factor) to inhibit scar-associated collagen type 1α2 and 3α1 production by fibroblasts.\",\n      \"method\": \"ANGPTL4 treatment, β-catenin nuclear fractionation, ID3 promoter reporter, co-IP (ID3-scleraxis), siRNA, collagen gene expression\",\n      \"journal\": \"Scientific Reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — co-IP plus reporter assay establishing ANGPTL4-cadherin11-β-catenin-ID3-scleraxis pathway, single lab\",\n      \"pmids\": [\"28740178\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"CD5L promotes M2 macrophage polarization through an autophagy-dependent mechanism: CD5L increases LC3-II and lysosome colocalization; siRNA targeting ATG7 blocks CD5L-induced ID3 upregulation (and downstream CD163/MerTK expression/efferocytosis); ID3 silencing reverses CD5L-induced M2 polarization, establishing an autophagy (ATG7)-ID3 axis in macrophage polarization.\",\n      \"method\": \"siRNA (ATG7, ID3), flow cytometry, RT-qPCR, gene expression profiling (THP1), LC3-II immunostaining\",\n      \"journal\": \"Frontiers in Immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — siRNA epistasis establishing autophagy-ID3 pathway, 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; this mechanism underlies ID3-promoted stemness in intrahepatic cholangiocarcinoma.\",\n      \"method\": \"Co-IP (ID3-E47), ChIP (E47 binding to β-catenin promoter), reporter assay, Wnt/β-catenin pathway analysis, sphere and xenograft assays\",\n      \"journal\": \"Hepatology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — co-IP plus ChIP demonstrating E47 displacement from β-catenin promoter, single lab\",\n      \"pmids\": [\"30520117\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"The lineage-determining factor ID3 in Kupffer cells controls the macrophage inhibitory/activating receptor balance by buffering binding of transcription factors ELK1 and E2A at the SIRPA locus, shifting phagocytic activity and lymphoid effector recruitment; loss- and gain-of-function experiments demonstrate ID3 is sufficient to confer anti-tumor activity to bone-marrow-derived macrophages and human iPSC-derived macrophages.\",\n      \"method\": \"Loss- and gain-of-function in mouse and human macrophages, ChIP/ATAC at SIRPA locus (ELK1/E2A binding), tumor phagocytosis assay, NK/CD8 T cell recruitment assay\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — mechanistic identification of ELK1/E2A buffering at SIRPA with multiple orthogonal functional assays in two species\",\n      \"pmids\": [\"38326607\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ID3 is a dominant-negative HLH protein that lacks a DNA-binding domain and functions primarily by heterodimerizing with E-proteins (E12, E47, E2-2, HEB) and other bHLH factors to prevent their DNA binding; its activity is regulated by Cdk2-dependent phosphorylation at Ser5 (which neutralizes its bHLH-sequestration function during late G1-S) and ATM-dependent phosphorylation at Ser65 (which enables recruitment of the DNA damage mediator MDC1 to double-strand breaks); ID3 transcription is induced downstream of Ras-ERK-MAPK, TGF-β/BMP-Smad, EGFR-AKT-Smad5, and Wnt/β-catenin signaling, and is directly repressed by Blimp-1 and MeCP2; through E-protein inhibition, ID3 governs cell-cycle progression (suppressing p21, p27, p57), controls lineage fate decisions in lymphoid, myeloid, neuronal, and vascular cells, maintains Foxp3 expression in regulatory T cells via an Id3-E47-Spi-B/SOCS3 axis, promotes anti-tumor activity in Kupffer cells by buffering ELK1/E2A at the SIRPA locus, and is itself degraded via COP9 signalosome-regulated ubiquitination.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"ID3 is a dominant-negative helix-loop-helix (HLH) protein that lacks a DNA-binding domain and functions as a master regulator of cell-fate decisions, cell-cycle progression, and immune homeostasis by heterodimerizing with E-proteins (E12, E47, E2-2, HEB) and other bHLH factors to sequester them from DNA [PMID:8759016, PMID:8853903]. Through E-protein inhibition, ID3 suppresses CDK inhibitors p21, p27, and p57 to drive G1/S transition, controls thymocyte positive and negative selection, maintains Foxp3 expression in regulatory T cells via an Id3–E47–Spi-B/SOCS3 axis, directs germinal center and plasma cell differentiation, and specifies Kupffer cell anti-tumor identity by buffering ELK1/E2A binding at the SIRPA locus [PMID:9372912, PMID:10661402, PMID:27974197, PMID:27217539, PMID:38326607]. ID3 activity is regulated at the transcriptional level by Ras-ERK, TGF-β/BMP-Smad, EGFR-AKT-Smad5, and Wnt/β-catenin signaling, and is directly repressed by Blimp-1 and MeCP2; post-translationally, Cdk2 phosphorylation at Ser5 neutralizes its bHLH-sequestration function during S-phase entry, ATM phosphorylation at Ser65 redirects ID3 to recruit the DNA damage mediator MDC1 to double-strand breaks, and COP9 signalosome-associated ubiquitination controls its degradation [PMID:11175815, PMID:21056086, PMID:22057288, PMID:16682435, PMID:9372912, PMID:29026069, PMID:15451666]. Loss of Id3 in mice causes defective B-cell proliferation, impaired thymocyte selection, autoimmune Sjögren's syndrome-like disease, and dysregulated regulatory T cell function, underscoring its non-redundant role in immune tolerance [PMID:10454544, PMID:15485632, PMID:21131965].\",\n  \"teleology\": [\n    {\n      \"year\": 1996,\n      \"claim\": \"Establishing ID3 as a dominant-negative HLH protein: the question of how ID3 blocks differentiation was answered by showing it forms non-functional dimers with myogenic bHLH factors and E-proteins, preventing their DNA binding, with both HLH and C-terminal domains required.\",\n      \"evidence\": \"Stable overexpression, antisense knockdown, EMSA, domain mutagenesis in myoblasts; yeast two-hybrid, co-IP, reporter assays for E12/E47/ALF1 interactions\",\n      \"pmids\": [\"8853903\", \"8853902\", \"8759016\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of ID3-E-protein dimer selectivity unknown\", \"In vivo relevance of C-terminal domain contribution not tested\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Discovery that Cdk2 phosphorylation at Ser5 acts as a cell-cycle-coupled switch to neutralize ID3's bHLH-sequestration function during G1/S, resolving how ID3 activity is temporally restricted.\",\n      \"evidence\": \"In vitro kinase assay with cyclin E/A-Cdk2, phospho-mimetic and phospho-ablating mutagenesis, EMSA, fibroblast S-phase entry assay\",\n      \"pmids\": [\"9372912\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Phosphatase(s) that reverse Ser5 phosphorylation unidentified\", \"Whether Ser5 phosphorylation affects ID3 stability in vivo not addressed\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Demonstration that ID3 selectively targets E2A/E47 over other bHLH factors in hematopoietic cells, explaining how ID3 shifts TAL1/E-protein dimer composition to promote erythroid differentiation.\",\n      \"evidence\": \"Retroviral overexpression in K562 cells, EMSA, Gal4-VP16 two-hybrid competition, E-box reporter\",\n      \"pmids\": [\"9525934\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Basis of E2A selectivity over other bHLH partners not structurally resolved\", \"Relevance to primary erythroid progenitors not shown\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Genetic ablation revealed non-redundant in vivo roles: Id3 KO impaired BCR-induced B-cell proliferation, while Id1/Id3 double KO caused premature neuronal differentiation, vascular malformations, and failure to support tumor angiogenesis, establishing ID3 as essential for both lymphocyte and neural/vascular development.\",\n      \"evidence\": \"Id3 KO and Id1/Id3 double KO mice, BCR cross-linking, retroviral rescue, tumor xenograft, histology\",\n      \"pmids\": [\"10454544\", \"10537105\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Degree of functional redundancy between Id1 and Id3 in each tissue not fully resolved\", \"Specific E-protein targets downstream in vascular endothelium not identified\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Id3 was shown to be required for thymocyte positive and negative selection through genetic epistasis with E2A, and to act as a lineage-fate switch between DC2/T/B versus NK fates, establishing its central role in T cell development and innate-adaptive lineage decisions.\",\n      \"evidence\": \"Id3 KO mice with MHC class I/II selection assays, E2A epistasis; retroviral OE in CD34+ progenitors, flow cytometry\",\n      \"pmids\": [\"10661402\", \"11120774\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct transcriptional targets of E2A that mediate positive selection not identified at this stage\", \"Whether Id3 and Id2 act redundantly in DC2 suppression not resolved\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Two studies placed ID3 within defined signaling pathways: TCR signaling through Ras-ERK rapidly induces Id3 to lower E2A DNA binding in thymocytes, and TGF-β induces Id3 to mediate growth arrest and apoptosis in lymphocyte progenitors, establishing ID3 as a convergent effector of mitogenic and cytokine signals.\",\n      \"evidence\": \"Primary thymocytes with TCR ligation and ERK inhibitor, EMSA, RT-PCR; Id3 KO lymphocyte progenitors with TGF-β treatment and apoptosis assay\",\n      \"pmids\": [\"11175815\", \"11224524\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether ERK phosphorylates Id3 promoter-associated factors directly not shown\", \"Transcription factors mediating TGF-β induction of Id3 not identified at this point\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"ID3 was linked to vascular disease: angiotensin II induces Id3 via superoxide in VSMCs, where Id3 represses p21/p27/p53 and drives proliferation, extending ID3's role beyond immune cells to cardiovascular pathology.\",\n      \"evidence\": \"Antisense and sense-Id3 transfection in VSMCs, SOD/catalase treatment, Western blot, DNA synthesis assay\",\n      \"pmids\": [\"12021231\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct versus indirect mechanism of superoxide-mediated Id3 induction not resolved\", \"Relevance to human vascular disease at this point correlative\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Multiple mechanisms controlling ID3 were delineated: COP9 signalosome (CSN5/CSN7) physically interacts with ID3 to regulate its ubiquitination and proteasomal degradation; a dominant-negative intron-retention isoform (Id3a) was discovered that inhibits VSMC growth and promotes apoptosis in vivo; and Id3-deficient mice develop Sjögren's syndrome-like autoimmune disease through a T cell-intrinsic mechanism.\",\n      \"evidence\": \"Mammalian two-hybrid, pull-down, ubiquitination assay, proteasome inhibitors; Id3a adenoviral delivery in balloon-injured rat carotid; Id3 KO with adoptive transfer and neonatal thymectomy\",\n      \"pmids\": [\"15451666\", \"15159391\", \"15485632\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"E3 ligase that ubiquitinates ID3 not identified\", \"Regulation of Id3a splicing switch not characterized\", \"Whether Sjögren's phenotype involves Treg dysfunction specifically not yet tested\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Cell-type-specific apoptotic mechanisms downstream of ID3 were dissected: in keratinocytes, ID3 triggers Bax-mediated mitochondrial caspase-9/3 apoptosis (relevant to UVB response), while in B lymphocyte progenitors it activates p53-independent caspase-2-dependent apoptosis.\",\n      \"evidence\": \"Overexpression and siRNA in keratinocytes with DN-caspase-9/Bcl-2 rescue; retroviral Id3 in B progenitors with caspase-2 assay, p53-null and Bcl-2-OE controls\",\n      \"pmids\": [\"16449966\", \"16177095\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether E-protein sequestration directly triggers each apoptotic pathway or acts indirectly not resolved\", \"Upstream signal selecting between caspase-2 vs caspase-9 pathway unknown\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"MeCP2 was identified as a direct transcriptional repressor of ID3: ChIP showed MeCP2 binding at the ID3 promoter, and MeCP2 loss (including Rett syndrome brain) leads to elevated ID3, linking ID3 dysregulation to neurodevelopmental disease.\",\n      \"evidence\": \"ChIP, genome-wide expression microarray, qRT-PCR in mouse and human Rett syndrome brain\",\n      \"pmids\": [\"16682435\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether elevated ID3 contributes causally to Rett syndrome phenotypes not tested\", \"Mechanism of MeCP2-mediated repression (methylation-dependent vs independent) at Id3 promoter not dissected\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"The mechanism by which ID3 represses p27 was resolved: ID3 inhibits ELK1 at the p27 promoter (confirmed by ChIP), blocking transcription and enabling G1/S transition, revealing a non-E-protein partner interaction.\",\n      \"evidence\": \"siRNA, ChIP (Id3-ELK1 at p27 promoter), reporter assay, flow cytometry in VSMCs\",\n      \"pmids\": [\"17404577\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether ID3-ELK1 interaction is direct or bridged by an intermediary not fully established\", \"Generalizability of ELK1 mechanism beyond VSMCs not tested\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Two new regulatory circuits were identified: ID3 inhibits E47-mediated adiponectin transcription (with Id3-null mice showing elevated serum adiponectin), and RhoA/ROCK-MRTF-A-Smad1/4 complex activates Id3 transcription in myoblasts, with a forkhead factor suppressing this axis during differentiation.\",\n      \"evidence\": \"ChIP in vitro and in Id3-null adipose tissue, reporter assay, promoter mutagenesis; co-IP of MRTF-A/Smad, Id3 promoter reporter with RhoA/ROCK inhibition\",\n      \"pmids\": [\"18669923\", \"18477564\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the forkhead factor that suppresses Id3 during differentiation not specified\", \"Whether ID3 regulation of adiponectin contributes to metabolic disease in vivo not tested\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"ID3 was established as critical for both CD8+ memory T cell persistence and Foxp3+ Treg generation: Blimp-1 directly represses Id3 in short-lived effector cells to limit memory formation, while TGF-β-induced Id3 is required to relieve GATA-3-mediated Foxp3 promoter inhibition and promote Treg differentiation.\",\n      \"evidence\": \"ChIP (Blimp-1 at Id3 promoter), retroviral OE, Id3 KO memory phenotype; Id3 KO Treg, Foxp3 reporter, ChIP (E2A/GATA-3 at Foxp3 promoter), Th17 assay; BMP2-SMAD-Id3 cis-element mapping\",\n      \"pmids\": [\"22057288\", \"21131965\", \"21056086\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether Blimp-1 repression of Id3 is sufficient or requires additional factors not resolved\", \"Precise stoichiometric relationship between Id3 and GATA-3 at Foxp3 locus not quantified\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Genome-wide and lineage studies showed that Id3-high cells are precursors of long-lived CD8+ memory T cells, Id3 enforces the naïve T cell fate by antagonizing genome-wide E2A occupancy at effector loci, and EGFR-AKT-Smad5 signaling induces ID3 in glioblastoma to confer stem-like properties.\",\n      \"evidence\": \"Id3 reporter knock-in and KO mice with flow cytometry; E2A ChIP-seq in Id3-deficient thymi; EGFR inhibitor, AKT-Smad5 phosphorylation assay, tumorsphere assay\",\n      \"pmids\": [\"22057289\", \"21857655\", \"21975932\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Signals that determine Id3-high vs Id3-low bifurcation at early effector stage not fully characterized\", \"Whether EGFR-AKT-Smad5-ID3 axis operates in normal neural stem cells not tested\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"ID3 was integrated into cardiovascular and cancer biology: it mediates atheroprotective B-cell homing via CCR6, represses VCAM-1 through inhibition of E12 at the VCAM-1 promoter, cooperates with ID1 to govern colon cancer-initiating cell self-renewal through p21, and drives cell-cycle entry in pancreatic duct cells while paradoxically triggering DNA damage in β-cells.\",\n      \"evidence\": \"Id3 KO × ApoE-/- mice with adoptive B cell transfer; ChIP and reporter at VCAM-1 promoter in VSMCs; siRNA of ID1/ID3 with serial transplantation; adenoviral Id3 in primary human pancreatic cells with Ki67/γH2AX\",\n      \"pmids\": [\"22034493\", \"23042815\", \"22698403\", \"21498546\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How Id3 regulates CCR6 transcription mechanistically not detailed\", \"Whether p21-dependent self-renewal mechanism is specific to colon cancer or generalizable not tested\", \"Why β-cells respond to Id3 with DNA damage rather than proliferation not explained\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Conditional deletion demonstrated that Id2 and Id3 together are essential in Tregs to suppress fatal inflammation, with TCR signaling initially decreasing Id3 to activate a follicular regulatory T cell program.\",\n      \"evidence\": \"Conditional Id2/Id3 deletion in Foxp3+ Tregs, flow cytometry, gene expression profiling\",\n      \"pmids\": [\"24973820\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Individual contributions of Id2 versus Id3 in Treg maintenance not fully separated\", \"Whether follicular Treg signature depends on specific E-protein targets not determined\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Two new regulatory axes were defined: TAK1-mediated Id3 downregulation enables E2A/GATA-3 binding at the Il9 promoter to control Th9 anti-tumor immunity, and BMP-2-induced Id3 in neural stem cells promotes astrocyte differentiation by restraining E47, as confirmed by complementary E47 KO.\",\n      \"evidence\": \"Id3 KO with TAK1 inhibition, ChIP at Il9 promoter, melanoma model; Id3 KO and E47 conditional KO mice, cortical injury model, NSPC culture\",\n      \"pmids\": [\"26322481\", \"26438726\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether TAK1 phosphorylates a specific Id3 degradation pathway not characterized\", \"How Id3/E47 balance integrates with other astrogliogenic signals (e.g. Notch, LIF) unknown\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Two studies established ID3 as a gatekeeper of B cell and Treg transcriptional programs: Id3 downregulation releases E2A/E2-2 to activate Blimp1/Xbp1/CXCR4 for GC/plasma cell differentiation, and an Id3–E47–Spi-B/SOCS3–Foxp3 axis was fully delineated for Treg stability.\",\n      \"evidence\": \"Conditional Id3 KO in B cells with immunization, flow cytometry, gene expression; Id3 KO Tregs, E47 retroviral OE, Foxp3 reporter\",\n      \"pmids\": [\"27217539\", \"27974197\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether E2A and E2-2 have non-overlapping roles in GC vs plasma cell fate not resolved\", \"Therapeutic potential of modulating Id3-E47 axis for autoimmune Treg instability not tested\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"A DNA-damage-independent function was uncovered: ATM phosphorylates ID3 at Ser65, enabling direct interaction with MDC1 and recruitment to DSB sites; ID3 depletion causes impaired DSB repair and genomic instability, establishing ID3 as a component of the DNA damage response. Separately, a Wnt/β-catenin-ID3 axis through ANGPTL4-cadherin-11 was identified in wound healing.\",\n      \"evidence\": \"ATM kinase assay, co-IP (ID3-MDC1), IR-induced foci, γH2AX ChIP, comet assay; ANGPTL4 treatment, β-catenin fractionation, co-IP (ID3-scleraxis), collagen gene analysis\",\n      \"pmids\": [\"29026069\", \"28740178\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether Ser65 phosphorylation and Ser5 phosphorylation are coordinated is unknown\", \"Whether ID3-MDC1 interaction requires the HLH domain or a distinct surface not mapped\", \"ANGPTL4-ID3-scleraxis pathway awaits independent confirmation\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"ID3 was shown to activate Wnt/β-catenin signaling in cholangiocarcinoma by blocking E47 recruitment to the β-catenin promoter, thereby promoting cancer stemness.\",\n      \"evidence\": \"Co-IP (ID3-E47), ChIP (E47 at β-catenin promoter), reporter assay, sphere and xenograft assays\",\n      \"pmids\": [\"30520117\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether this mechanism operates in normal cholangiocytes not tested\", \"Generalizability beyond cholangiocarcinoma not established\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"ID3 was identified as the lineage-determining factor in Kupffer cells that controls anti-tumor immunity by buffering ELK1 and E2A transcription factor occupancy at the SIRPA locus, shifting the inhibitory/activating receptor balance to promote phagocytosis and lymphoid effector recruitment.\",\n      \"evidence\": \"Loss- and gain-of-function in mouse and human macrophages, ChIP/ATAC at SIRPA locus, tumor phagocytosis assay, NK/CD8 T cell recruitment\",\n      \"pmids\": [\"38326607\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether ID3-dependent SIRPA regulation extends to other tissue-resident macrophages not tested\", \"Upstream signals maintaining Id3 expression specifically in Kupffer cells not fully defined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the identity of the E3 ubiquitin ligase that targets ID3 for degradation, how Ser5 and Ser65 phosphorylation are coordinated, the structural basis for ID3's selectivity among bHLH partners, and whether the DNA damage response function of ID3 is mechanistically linked to its E-protein sequestration activity.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"E3 ligase identity unknown\", \"Coordination of Ser5/Ser65 phosphorylation events not studied\", \"No crystal or cryo-EM structure of ID3 in complex with any partner\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 1, 3, 18, 19, 29, 35, 40]},\n      {\"term_id\": \"GO:0140313\", \"supporting_discovery_ids\": [0, 1, 3, 29, 39]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 1, 36, 40]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [2, 10, 18, 27, 30]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [4, 7, 9, 14, 21, 22, 24, 25, 31, 32, 34, 35, 40]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [8, 9, 20, 23, 26, 37]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [36]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [5, 6, 33]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [15, 16]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [17, 21, 29, 35]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"E47\", \"E12\", \"E2-2\", \"ELK1\", \"MDC1\", \"CSN5\", \"GATA3\", \"scleraxis\"],\n    \"other_free_text\": []\n  }\n}\n```"}