{"gene":"BHLHE40","run_date":"2026-06-09T22:02:44","timeline":{"discoveries":[{"year":2014,"finding":"Bhlhe40 is required cell-intrinsically in T cells to positively regulate GM-CSF production and negatively regulate IL-10 production; blockade of IL-10 receptor in Bhlhe40-/- mice restores EAE susceptibility, placing Bhlhe40 upstream of GM-CSF and IL-10 in autoreactive T-cell pathogenicity.","method":"Bhlhe40 knockout mice, T cell-specific rescue, IL-10 receptor blockade epistasis, in vitro cytokine assays in polarized Th1/Th17 cells","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (KO, adoptive transfer, receptor blockade epistasis), independently replicated in subsequent papers","pmids":["24699451"],"is_preprint":false},{"year":2018,"finding":"Bhlhe40 acts as a molecular switch determining inflammatory vs. anti-inflammatory Th1 cell fate: Bhlhe40-deficient Th1 cells produce less IFN-γ and substantially more IL-10; Bhlhe40-mediated IFN-γ production is independent of T-bet regulation; IL-10 blockade rescues Bhlhe40-deficient mice from death during Toxoplasma gondii infection.","method":"Bhlhe40 conditional KO in T cells, in vitro and in vivo cytokine measurement, IL-10 signaling blockade epistasis","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — T-cell-conditional KO with multiple in vivo epistasis experiments and in vitro validation","pmids":["29773643"],"is_preprint":false},{"year":2018,"finding":"Bhlhe40 is the first transcription factor found essential specifically to repress Il10 expression during Mycobacterium tuberculosis infection; deletion of Il10 in Bhlhe40-/- mice reverses higher bacterial burden and early lethality; Bhlhe40 deletion in T cells or CD11c+ cells is each sufficient to confer susceptibility.","method":"Bhlhe40-/- mice, Il10/Bhlhe40 double-KO epistasis, cell-type-specific deletion using Cre drivers, bacterial burden quantification","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — double-KO epistasis with cell-type specificity, replicated across infection models","pmids":["29773644"],"is_preprint":false},{"year":2016,"finding":"Bhlhe40 expression in T cells is induced by IL-1β downstream of pertussis toxin/IL-1R signaling; Bhlhe40-expressing cells exhibit an encephalitogenic transcriptional signature; PTX co-adjuvanticity in EAE is Bhlhe40 dependent, defining a PTX–IL-1β–Bhlhe40 pathway.","method":"Bhlhe40 reporter mice, TCR-transgenic adoptive transfer, IL-1β stimulation of polarized Th17 cells, in vivo IL-1R signaling blockade","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — reporter mice combined with adoptive transfer and pharmacological epistasis across multiple in vivo settings","pmids":["26834156"],"is_preprint":false},{"year":2019,"finding":"Bhlhe40 is required cell-intrinsically for tissue-resident memory CD8+ T cell (Trm) and tumor-infiltrating lymphocyte (TIL) development and polyfunctionality; PD-1 signaling inhibits TIL Bhlhe40 expression; Bhlhe40 sustains mitochondrial fitness and a functional epigenetic state in Trm/TIL cells; Bhlhe40 is critical for TIL reinvigoration following anti-PD-L1 blockade.","method":"Bhlhe40 KO mice, metabolic assays, epigenetic profiling, anti-PD-L1 blockade in tumor models","journal":"Immunity","confidence":"High","confidence_rationale":"Tier 2 / Strong — KO with metabolic, epigenetic, and functional readouts plus in vivo checkpoint blockade","pmids":["31533057"],"is_preprint":false},{"year":2019,"finding":"Bhlhe40 is required cell-intrinsically for self-renewal and maintenance of large peritoneal macrophages (LPMs) and for their proliferation (but not polarization) in response to IL-4; Bhlhe40 directly represses c-Maf and Mafb and promotes expression of cell-cycle genes in LPMs; genome-wide ChIP shows Bhlhe40 co-occupies PU.1 sites and unique loci including Maf and cell-cycle loci.","method":"Bhlhe40 KO mice, competitive reconstitution, IL-4/helminth infection models, ChIP-seq, gene expression analysis","journal":"Nature immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP-seq plus competitive KO with multiple in vivo disease models and proliferation assays","pmids":["31061528"],"is_preprint":false},{"year":2019,"finding":"Bhlhe40 and Bhlhe41 are required for alveolar macrophage self-renewal and identity; their loss reduces AM proliferation and down-regulates AM signature genes while inducing genes of other macrophage lineages; genome-wide Bhlhe40 DNA-binding analysis shows direct repression of lineage-inappropriate genes.","method":"Bhlhe40/41 conditional KO, competitive setting, RNA-seq, ChIP-seq/genome-wide DNA binding","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP-seq plus KO with multiple orthogonal readouts","pmids":["31414712"],"is_preprint":false},{"year":2018,"finding":"BHLHE40 is required as a third transcription factor for insulin induction of hepatic SREBP-1c mRNA; BHLHE40 physically binds to C/EBPβ and LXRα in rat liver (co-immunoprecipitation); hepatic BHLHE40 mRNA rises rapidly upon refeeding or insulin treatment; BHLHE40 is necessary but not sufficient for SREBP-1c induction.","method":"Co-immunoprecipitation, gene knockout in mice, siRNA knockdown in hepatocytes, lentiviral overexpression, fasted/refed rat model","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP identifying binding partners, KO and siRNA with defined molecular phenotype, necessity/sufficiency dissection","pmids":["29952285"],"is_preprint":false},{"year":2016,"finding":"Bhlhe40 functions as a cofactor of T-bet to enhance IFN-γ production in iNKT cells; Bhlhe40 alone has no significant effect on Ifng promoter activity but enhances T-bet-mediated Ifng promoter activation; ChIP shows Bhlhe40 accumulates at the T-box region of the Ifng locus and promotes H3K9 acetylation there in a T-bet-dependent manner.","method":"ChIP assay, Ifng promoter-luciferase reporter, Bhlhe40-deficient mice, iNKT cell functional assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Moderate — ChIP with histone modification readout plus functional reporter assays and KO, single lab","pmids":["27226296"],"is_preprint":false},{"year":2008,"finding":"BHLHB2/BHLHE40 binds directly to a sequence within Bdnf promoter 4 (identified by EMSA/ChIP) and mediates transcriptional repression; NMDA receptor activation reduces BHLHB2 occupancy at promoter 4 and de-represses transcription; Bhlhb2 KO mice show increased hippocampal exon-4-specific Bdnf mRNA and increased seizure susceptibility.","method":"EMSA, ChIP in hippocampal neurons, Bhlhb2 knockout mice, NMDA stimulation, kainic acid seizure model","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct DNA-binding assay (EMSA+ChIP) plus KO phenotype with multiple orthogonal methods","pmids":["18234890"],"is_preprint":false},{"year":2008,"finding":"SHARP-1 and SHARP-2 (Bhlhe40) single and double mutant mice display altered circadian period length, tissue-specific clock gene expression, and entrainment kinetics; SHARP-1/2 can serve as both repressors and co-activators of mammalian clock gene expression in a context-specific manner, shown by differential Per2 amplitude changes across tissues.","method":"Sharp-1 and Sharp-2 single/double KO mice, in vivo EEG/wheel-running, light-pulse entrainment, tissue-specific clock gene expression","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic dissection with single/double KO and multiple tissue/behavioral readouts","pmids":["18648504"],"is_preprint":false},{"year":2015,"finding":"Bhlhe40 binds to PGC-1α directly and co-occupies PGC-1α-targeted gene promoters/enhancers to repress PGC-1α transactivational activity; repression is mediated by recruiting HDACs and preventing relief of PGC-1α intramolecular suppression; Bhlhe40 knockdown increases ROS, fatty acid oxidation, mitochondrial DNA, and PGC-1α target gene expression; exercise reduces Bhlhe40 recruitment to these loci.","method":"Co-immunoprecipitation, ChIP, siRNA knockdown, PGC-1α-interacting domain overexpression, exercise model in skeletal muscle","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct protein-protein interaction (Co-IP) plus ChIP plus KD with multiple metabolic readouts","pmids":["25963661"],"is_preprint":false},{"year":2009,"finding":"Bhlhe40 binds to the E1-box on the PGC-1α core promoter (confirmed by EMSA) and forms a complex with MyoD; Bhlhe40 represses MyoD-mediated transactivation of PGC-1α and myogenic gene promoters; P/CAF relieves this repression by interacting with Bhlhe40, thereby disrupting the P/CAF–MyoD interaction.","method":"EMSA, co-immunoprecipitation, ChIP in myogenic cells, luciferase reporter assays, P/CAF dose-response","journal":"The Biochemical journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — EMSA + Co-IP + ChIP + reporter in same study, mechanistic detail on cofactor competition","pmids":["19522704"],"is_preprint":false},{"year":2015,"finding":"Bhlhe40 is induced by hypoxia in satellite cell-derived primary myoblasts through a p53-dependent (HIF1α-independent) pathway; Bhlhe40 binds to proximal E-boxes of the Myog promoter, reduces MyoD binding affinity and transcriptional activity, thereby inhibiting myogenic differentiation; Bhlhe40 knockdown rescues myogenic differentiation under hypoxia.","method":"Microarray, ChIP, Bhlhe40 overexpression/knockdown, Myog promoter binding assays, HIF1α inhibition, p53 pathway analysis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — ChIP plus functional KD rescue under hypoxia, pathway dissection with HIF1α and p53, single lab","pmids":["26468276"],"is_preprint":false},{"year":2018,"finding":"BHLHE40 differentially regulates peroxisome and mitochondria in myogenic cells: Bhlhe40 knockdown increases peroxisome number/activity but reduces mitochondrial efficiency and bursts ROS; a constitutively active PGC-1α-interacting domain (VBH135) of Bhlhe40 mimics peroxisome effects while simultaneously reducing ROS and increasing mitochondrial efficiency.","method":"Bhlhe40 siRNA knockdown, VBH135 constitutively-active domain overexpression, organelle activity assays, ROS measurement, fatty acid oxidation assays, gene expression profiling","journal":"Redox biology","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — functional domain-based dissection with multiple organelle readouts, single lab","pmids":["30391825"],"is_preprint":false},{"year":2008,"finding":"BHLHB2/BHLHE40 is induced by glucose and ChREBP in rat hepatocytes via a functional ChoRE element (-160 to -143 bp) in the Bhlhb2 promoter; BHLHB2 in turn binds ChoRE in Fasn, Lpk, and Bhlhb2 promoters (shown by ChIP) and represses glucose/ChREBP-mediated induction of lipogenic genes, forming a negative feedback loop with ChREBP.","method":"Promoter deletion analysis, ChIP, Bhlhb2 overexpression in hepatocytes, mRNA quantification","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — ChIP plus promoter deletion, single lab, limited orthogonal validation","pmids":["18602890"],"is_preprint":false},{"year":2002,"finding":"DEC1/BHLHE40 requires its DNA-binding domain for both proliferation inhibition and anti-apoptotic activity; stable DEC1 expression selectively inhibits activation of procaspases 3, 7, and 9 (mitochondrial pathway) but not procaspase 8, blocking mitochondria-initiated apoptosis; a DNA-binding-domain mutant loses both activities.","method":"Tetracycline-inducible stable transfection, procaspase activity enzymatic assays, immunoblotting, serum deprivation apoptosis model, DNA-binding mutant","journal":"The Biochemical journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — enzymatic assays plus mutagenesis with inducible expression system, single lab","pmids":["12119049"],"is_preprint":false},{"year":2015,"finding":"BHLHE40/41 suppress TWIST1 transcription by competing with SP1 for DNA binding at a critical TWIST1 promoter region; SP1 mediates basal TWIST1 transcriptional activity at the -233 to -61 bp region; BHLHE40/41 also suppress SNAI1 and SNAI2, inhibiting EMT and tumor cell invasion.","method":"Luciferase reporter assay, ChIP, BHLHE40/41 overexpression/knockdown, invasion assays, SP1 siRNA epistasis","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reporter plus ChIP plus SP1 epistasis, single lab","pmids":["26391953"],"is_preprint":false},{"year":2018,"finding":"BHLHE40 induces HBEGF transcription by blocking DNA binding of HDAC1 and HDAC2 to the HBEGF promoter (shown by ChIP and CoIP); HBEGF is secreted through exosomes and promotes breast cancer cell survival and migration; BHLHE40 knockdown/KO reduces primary tumor growth and lung metastasis in orthotopic xenograft models.","method":"ChIP, co-immunoprecipitation, shRNA knockdown, CRISPR/Cas9 KO, xenograft and metastasis models, exosome analysis","journal":"Breast cancer research : BCR","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP + Co-IP + in vivo models, single lab","pmids":["30285805"],"is_preprint":false},{"year":2018,"finding":"BHLHE40 suppresses CLDN1 transcription not by direct E-box binding but by interacting with SP1 (shown by co-immunoprecipitation and co-localization) and preventing SP1 from binding a specific motif (-233 to -61 bp) in the CLDN1 promoter; the BHLH and Orange domains of BHLHE40 are both required for the BHLHE40–SP1 interaction.","method":"Co-immunoprecipitation, reporter assays, siRNA for SP1 epistasis, deletion mutagenesis of BHLHE40 domains, invasion assays","journal":"Molecular carcinogenesis","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus domain mutagenesis plus reporter/epistasis, single lab","pmids":["29704436"],"is_preprint":false},{"year":2023,"finding":"BHLHE40 regulates a differentiation checkpoint between progenitor and intermediate exhausted CD8+ T cell (Tex) subsets; identified by genome-wide CRISPR screen in a benchmarked in vitro chronic stimulation model and validated in vivo.","method":"In vitro CRISPR pooled screen, in vitro/in vivo validation, phenotypic/transcriptional/epigenetic benchmarking","journal":"Science immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genome-wide CRISPR screen with in vitro and in vivo validation, multiple orthogonal benchmarking methods","pmids":["37595022"],"is_preprint":false},{"year":2023,"finding":"BHLHE40 represses MAFA expression in hypoxic pancreatic β-cells by attenuating PDX1 binding to the Mafa enhancer region, thereby suppressing insulin secretion; BHLHE40 deficiency in hypoxic MIN6 cells or ob/ob mouse β-cells reverses insulin secretion defects; MAFA re-expression rescues impaired insulin secretion.","method":"BHLHE40 KO in MIN6 cells and ob/ob mice, ChIP for PDX1 occupancy, MAFA re-expression rescue, insulin secretion assays","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP showing indirect mechanism, KO in two systems, rescue experiment with defined molecular target","pmids":["37341148"],"is_preprint":false},{"year":2020,"finding":"BHLHE40 and BHLHE41, upregulated by high sustained nuclear TFEB, act in opposition to TFEB upon lysosomal cell death induction; BHLHE40/41 counter-regulate TFEB target genes, adding a negative feedback loop to TFEB regulatory mechanisms.","method":"Genome-wide CRISPR library screen, TFEB subcellular localization control, lysosomal cell death assays, gene expression analysis","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genome-wide CRISPR screen with functional validation in lysosomal death assay, single lab","pmids":["33176151"],"is_preprint":false},{"year":2024,"finding":"BHLHE40 regulates SREBF1 transcription both as a classic transcription factor and by physically linking SREBF1 enhancer and promoter regions; the BHLHE40–SREBF1–stearoyl-CoA desaturase axis protects pancreatic cancer cells from ferroptosis by reducing lipid peroxidation.","method":"ChIP-seq, RNA-seq, Hi-C/chromosome conformation capture, BHLHE40 KO, ferroptosis assays, lipid peroxidation measurement","journal":"Advanced science","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — ChIP-seq + Hi-C chromosome conformation capture + KO with functional ferroptosis readout, single lab","pmids":["38064101"],"is_preprint":false},{"year":2022,"finding":"Bhlhe40 is required in CD4+ T cells for GM-CSF production during graft-versus-host disease; GM-CSF (regulated by Bhlhe40) is independent of IL-6 and IL-23 signaling; mechanistically, GM-CSF produced by Bhlhe40+ T cells enhances donor dendritic cell activation in the colon, promotes indirect alloantigen presentation, and drives proinflammatory T cell accumulation.","method":"Bhlhe40 KO in GVHD model, cytokine blockade epistasis, DC activation and alloantigen presentation assays, colonic inflammation readouts","journal":"Blood","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO with cellular mechanistic readouts and cytokine epistasis, single lab","pmids":["31880771"],"is_preprint":false},{"year":2021,"finding":"Bhlhe40 is a cell-intrinsic negative regulator of both the B cell and T cell sides of the germinal center reaction: in activated CD4 T cells it restrains proliferation (limiting TFH numbers), and in B cells it selectively restricts generation of the earliest GC B cells; Bhlhe40-deficient mice develop B cell lymphoma with age.","method":"Bhlhe40 KO mice, immunization, flow cytometry for GC B/TFH cells, adoptive transfer, proliferation assays","journal":"The Journal of experimental medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO with defined cellular phenotypes and time-course analysis of GC reaction, single lab","pmids":["34919144"],"is_preprint":false},{"year":2024,"finding":"Bhlhe40 directly binds cis-regulatory elements of Th1-related genes (Tbx21, Cxcr6) to activate their expression and binds regions of Tfh-related genes (Bcl6, Cxcr5) to repress them; CD4+ T cell-specific Bhlhe40 deletion abrogates Th1 but augments Tfh differentiation and GC B cell help during LCMV infection.","method":"CD4-Cre conditional KO, epigenetic profiling (ATAC-seq/ChIP), antigen-specific T cell analysis after LCMV infection, gene expression analysis","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — epigenetic profiling with direct cis-element binding evidence plus conditional KO with multiple lineage readouts","pmids":["38619295"],"is_preprint":false},{"year":2023,"finding":"STAT4 promotes Bhlhe40 induction in NK cells during mouse CMV infection by enriching H3K4me3 at the Bhlhe40 promoter; Bhlhe40 directly promotes IFN-γ production by binding throughout the Ifng locus in activated NK cells; Bhlhe40-deficient NK cells show impaired IFN-γ production and diminished protective immunity.","method":"ChIP for STAT4 and H3K4me3 at Bhlhe40 promoter, ChIP for Bhlhe40 at Ifng locus, Bhlhe40 KO NK cell functional assays, viral challenge model","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct ChIP evidence at multiple genomic loci plus KO with in vivo viral challenge","pmids":["37830760"],"is_preprint":false},{"year":2022,"finding":"Bhlhe40 promotes osteoclastogenesis by directly binding to promoter regions of c-Fos (Fos) and Nfatc1 and upregulating their expression; inhibition of Fos/Nfatc1 abrogates enhanced osteoclast differentiation induced by BHLHE40 overexpression; Bhlhe40-deficient mice have increased bone mass and decreased osteoclast bone resorption in vivo.","method":"ChIP for Bhlhe40 at Fos/Nfatc1 promoters, BHLHE40 overexpression, Bhlhe40 KO mice (micro-CT, histomorphometry), Fos/Nfatc1 inhibition epistasis","journal":"Cell & bioscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus KO phenotype plus epistasis, single lab","pmids":["35619122"],"is_preprint":false},{"year":2024,"finding":"BHLHE40 directly suppresses PPM1F transcription; loss of Bhlhe40 leads to AMPKα dephosphorylation (via elevated PPM1F), enhanced PDHA1 Ser293 phosphorylation, and increased LDH activity, shifting metabolism toward glycolysis; the BHLHE40–PPM1F–AMPK axis thus modulates energy metabolism in endometrial cancer cells.","method":"Bhlhe40 knockdown, AMPKα phosphorylation assays, PDH/LDH activity assays, ChIP for BHLHE40 at PPM1F promoter, immunohistochemistry","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct promoter ChIP plus enzymatic activity assays and phosphorylation mapping, single lab","pmids":["38301894"],"is_preprint":false},{"year":2019,"finding":"BHLHE40 in H. pylori-infected gastric epithelial cells translocates to the nucleus and binds cagA-activated p-STAT3 (Tyr705); the BHLHE40–p-STAT3 complex increases CXCL12 expression, which fosters CD4+ T cell infiltration in gastric mucosa, defining a cagA–BHLHE40–CXCL12 inflammatory axis.","method":"Co-immunoprecipitation, ChIP for BHLHE40 at CXCL12 promoter, H. pylori infection model in vivo and in vitro, cagA pathway inhibition","journal":"FASEB journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP + ChIP + in vivo infection model, single lab","pmids":["31914631"],"is_preprint":false},{"year":2001,"finding":"DEC1/BHLHE40 mRNA is rapidly and directly induced by the cAMP pathway (PTH, Bt2cAMP, forskolin) in chondrocytes and multiple cell types; actinomycin D and cycloheximide studies show the induction is at the transcriptional level and does not require new protein synthesis, identifying DEC1 as a direct cAMP target gene.","method":"Northern blot/RT-PCR in multiple cell types, actinomycin D (transcriptional inhibition), cycloheximide (protein synthesis inhibition), promoter analysis","journal":"European journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — pharmacological dissection with multiple cell types, no ChIP; replicated across cell lines","pmids":["11432722"],"is_preprint":false},{"year":2012,"finding":"BHLHE40 is a primary, dynamically regulated transcriptional target of the vitamin D receptor (VDR); the VDR binding site is located 1.7 kb upstream of the BHLHE40 transcription start site; 1α,25(OH)2D3 treatment significantly opens chromatin at this site and up-regulates BHLHE40 mRNA with a short half-life of ~0.9 h.","method":"Genome-wide VDR ChIP-seq, ATAC/open chromatin analysis, histone modification data, mRNA stability assay, trichostatin A treatment","journal":"The Journal of steroid biochemistry and molecular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP-seq with chromatin accessibility readout and mRNA stability measurement, single lab","pmids":["23220548"],"is_preprint":false},{"year":2024,"finding":"BHLHE40 directly binds the ABCB1 gene promoter (-1605 to -1597) and represses its transcription; BHLHE40 expression is negatively correlated with ABCB1 in cancer cells; BHLHE40 overexpression resensitizes adriamycin-resistant cells to the drug while KD induces resistance, defining BHLHE40 as a transcriptional suppressor of P-gp-mediated multidrug resistance.","method":"ChIP-seq for BHLHE40 occupancy at ABCB1 promoter, overexpression and knockdown in resistant cell lines, apoptosis and drug sensitivity assays, in vivo xenograft","journal":"Neoplasia","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP-seq plus gain/loss-of-function with in vivo validation, single lab","pmids":["36931039"],"is_preprint":false},{"year":2025,"finding":"BHLHE40 interacts directly with GATA2 and GATA3 to facilitate their chromatin occupancy and activates transcriptional programs essential for syncytiotrophoblast differentiation, including CGB; CRISPR/Cas9 KO of BHLHE40 in trophoblast stem cells prevents STB differentiation and impairs hormone synthesis and syncytialization.","method":"DNA pull-down coupled with mass spectrometry, Co-immunoprecipitation, CRISPR/Cas9 KO, ChIP for GATA2/3 occupancy, trophoblast differentiation assays","journal":"Advanced science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mass-spec protein identification + Co-IP + ChIP + KO with functional differentiation readout, single lab","pmids":["40911186"],"is_preprint":false},{"year":2025,"finding":"REV-ERB promotes colonic RORγt+Foxp3+ Treg differentiation by suppressing Bhlhe40 expression; Bhlhe40 in turn inhibits c-Maf, a key factor for colonic Treg differentiation and function; the Bhlhe40–c-Maf axis also regulates IL-10 and CTLA-4 expression in Tregs, placing Bhlhe40 as a negative intermediary in the REV-ERB→Bhlhe40→c-Maf pathway.","method":"REV-ERB KO, Bhlhe40 overexpression/knockdown in Tregs, c-Maf rescue experiments, intestinal inflammation models (TNBS, oxazolone), cytokine measurement","journal":"The Journal of experimental medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — epistasis with KO/OE cascade and in vivo disease model, single lab","pmids":["41359309"],"is_preprint":false},{"year":2024,"finding":"Loss/reduction of BHLHE40/41 in iPSC-derived microglia, THP-1 macrophages, and mouse microglia increases expression of disease-associated macrophage (DLAM) genes involved in cholesterol clearance and lysosomal processing, increases cholesterol efflux and storage, and increases lysosomal mass and degradative capacity, revealing BHLHE40/41 as repressors of the DLAM response.","method":"Gene KO/knockdown in iPSC microglia and THP-1 macrophages, mouse microglia Bhlhe40/41 KO, cholesterol efflux assays, lysosomal mass assays, transcriptomic analysis","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO across multiple human and mouse cell models with functional metabolic readouts, single lab","pmids":["38448474"],"is_preprint":false},{"year":2021,"finding":"In vascular smooth muscle cells, lncRNA SNHG1 stabilizes Bhlhe40 mRNA by directly interacting with its 3'-UTR and also promotes Bhlhe40 nuclear translocation by scaffolding SUMO E3 ligase PIAS3 to facilitate Bhlhe40 SUMOylation; nuclear Bhlhe40 then suppresses Atg10 transcription to reduce autophagosome formation.","method":"RNA pull-down, RNA immunoprecipitation, RNA stability assay, luciferase reporter, co-immunoprecipitation, Western blot, Bhlhe40 knockdown/overexpression","journal":"Journal of physiology and biochemistry","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — multiple RNA-protein interaction assays plus Co-IP for SUMOylation scaffold, single lab","pmids":["36194366"],"is_preprint":false},{"year":2024,"finding":"Bhlhe40 promotes alternative macrophage activation in asthma by directly binding the Neurturin (Nrtn) promoter and reducing its transcriptional activity; Bhlhe40 knockdown reduces OVA-induced lung inflammation, and simultaneous knockdown of Nrtn reverses this protective effect.","method":"Dual luciferase assay, ChIP-qPCR for Bhlhe40 at Nrtn promoter, Bhlhe40 KD in vivo and in vitro, Nrtn KD epistasis, OVA asthma model","journal":"Communications biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct promoter binding by ChIP-qPCR plus epistasis in vivo, single lab","pmids":["40467844"],"is_preprint":false},{"year":2022,"finding":"Cardiac-specific knockdown of Bhlhe40 attenuates Ang II-induced atrial fibrillation; mechanistically, Bhlhe40 KD inhibits NF-κB/NLRP3 signaling, TGF-β1/Smad2 signaling, reduces CX43 expression, and prevents Kv4.3 downregulation in atria.","method":"rAAV9-shBhlhe40 cardiac-specific KD, echocardiography, programmed electrical stimulation, histology, Western blot for signaling pathway components","journal":"Frontiers in cardiovascular medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — cardiac-specific KD with mechanistic signaling pathway readouts in vivo, single lab","pmids":["36304536"],"is_preprint":false},{"year":2024,"finding":"BHLHE40 is a novel direct androgen receptor (AR) target gene (shown by ChIP-seq); BHLHE40 physically interacts with AR (Co-IP) and co-translocates into the nucleus upon supraphysiological androgen (SAL) treatment; BHLHE40 mediates SAL-induced cellular senescence; downstream, BHLHE40 directly targets cyclin G2 (CCNG2) to execute senescence, defining an AR–BHLHE40–CCNG2 tumor-suppressive axis.","method":"RNA-seq, ChIP-seq (AR binding to BHLHE40 gene; BHLHE40 binding to CCNG2), Co-immunoprecipitation, nuclear translocation assay, BHLHE40 KD, in vivo xenograft","journal":"Journal of experimental & clinical cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP-seq + Co-IP + KD with in vivo validation, single lab","pmids":["38902772"],"is_preprint":false},{"year":2021,"finding":"Bhlhe40 directly binds to and negatively regulates Sirt1 promoter activity (shown by luciferase reporter); the Bhlhe40/Sirt1 axis regulates mitophagy in neural stem cells; loss of Sirt1 downstream of elevated Bhlhe40 impairs autophagy and contributes to spina bifida aperta.","method":"Luciferase reporter assay (Bhlhe40 binding to Sirt1 promoter), RNA-seq, Sirt1 activator (resveratrol) rescue, immunofluorescence for autophagy markers, ATRA-induced rat NTD model","journal":"Frontiers in cell and developmental biology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — direct promoter reporter plus in vivo rescue, limited binding confirmation, single lab","pmids":["33987177"],"is_preprint":false},{"year":2013,"finding":"DEC1/BHLHE40 binds directly to the promoter region of cyclin D1 in A549 lung cancer cells (shown by ChIP); DEC1 overexpression down-regulates cyclin D1, while DEC1 knockdown up-regulates it, inhibiting or promoting cell growth respectively.","method":"ChIP for DEC1 at cyclin D1 promoter, siRNA knockdown, DEC1 overexpression, colony formation and growth assays","journal":"Tumour biology","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — ChIP plus gain/loss-of-function but single target/single lab","pmids":["23423709"],"is_preprint":false},{"year":2025,"finding":"Bhlhe40 regulates CXCR5 expression and Tfh cell migration into germinal centers by repressing Pou2af1 expression; Pou2af1 promotes Tfh formation and GC entry by upregulating CXCR5 (but not Bcl6); this Bhlhe40–Pou2af1 circuit is distinct from the Bcl6–Blimp1 fate-determination circuit.","method":"RNA-seq of antigen-specific Tfh cells in vivo (LCMV), Bhlhe40 and Pou2af1 KO/overexpression, epigenetic profiling, CXCR5 expression and GC migration assays","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo KO with transcriptomic profiling and functional GC migration readout, single lab","pmids":["41134666"],"is_preprint":false},{"year":2023,"finding":"BHLHE40 directly binds to the promoter of GRIN2D and activates its transcription in gastric cancer; BHLHE40/GRIN2D axis promotes glycolysis via p38 MAPK phosphorylation and calcium efflux; GRIN2D overexpression reverses the anti-tumor effects of BHLHE40 knockdown.","method":"ChIP for BHLHE40 at GRIN2D promoter, BHLHE40/GRIN2D KD and rescue, glycolysis assays, calcium efflux measurement, in vivo tumor model","journal":"Functional & integrative genomics","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — ChIP plus rescue epistasis, single lab, limited mechanistic depth","pmids":["39546079"],"is_preprint":false},{"year":2024,"finding":"BHLHE40 binds to the NLRP3 promoter as a negative transcriptional regulator (shown by Western blot/bioinformatics in smooth muscle cells); empagliflozin increases BHLHE40 expression to inhibit NLRP3 inflammasome activation and reduce vascular calcification; NLRP3 KO abolishes the protective effect.","method":"Western blot, bioinformatics binding analysis, NLRP3 KO mice (STZ model), db/db mouse model, EMPA treatment, high-glucose VSMC in vitro","journal":"Acta pharmacologica Sinica","confidence":"Low","confidence_rationale":"Tier 3 / Weak — promoter binding inferred from bioinformatics + Western blot without direct ChIP; single lab","pmids":["38172306"],"is_preprint":false},{"year":2023,"finding":"In glioma, CCDC86 interacts with BHLHE40 (Co-IP) and stabilizes ATF3 expression through BHLHE40-mediated transcriptional regulation of ATF3; this CCDC86–BHLHE40–ATF3 axis activates ERK signaling and aerobic glycolysis to drive tumor progression.","method":"Co-immunoprecipitation of CCDC86 and BHLHE40, BHLHE40/ATF3 KD, ERK signaling assays, glycolysis assays, in vitro/in vivo glioma models","journal":"Genes & diseases","confidence":"Low","confidence_rationale":"Tier 3 / Weak — Co-IP without ChIP confirmation of direct transcriptional mechanism, single lab","pmids":["40837407"],"is_preprint":false}],"current_model":"BHLHE40 (also known as BHLHB2, SHARP2, DEC1, STRA13) is a basic helix-loop-helix transcriptional repressor and, context-dependently, activator that binds E-box elements and non-E-box sites via protein-protein interactions (e.g., with SP1, T-bet, PGC-1α, C/EBPβ, LXRα, GATA2/3, AR); it is a central regulator of immune cell cytokine output (repressing IL-10 while promoting IFN-γ and GM-CSF in T and NK cells), controls tissue-resident macrophage and alveolar macrophage identity and self-renewal by repressing lineage-inappropriate genes (c-Maf, Mafb) and promoting cell-cycle gene expression, sustains CD8+ Trm and TIL mitochondrial fitness and epigenetic state required for anti-tumor immunity, modulates circadian clock amplitude and entrainment as a negative-feedback repressor competing with CLOCK:BMAL1, and regulates metabolism in multiple tissues by repressing PGC-1α activity (via HDAC recruitment), suppressing lipogenic genes (FASN, LPK via ChoRE competition with ChREBP), and acting as a required co-factor (with C/EBPβ and LXRα) for insulin-induced SREBP-1c expression in liver."},"narrative":{"mechanistic_narrative":"BHLHE40 (also DEC1/SHARP-2/BHLHB2) is a basic helix-loop-helix transcription factor that operates as both a direct repressor and a context-dependent activator, integrating immune, metabolic, circadian, and developmental gene programs through E-box binding and through protein-protein interactions that redirect it to non-E-box loci [PMID:18234890, PMID:25963661, PMID:26391953]. In the immune system it is a master rheostat of cytokine output: it is required cell-intrinsically in T cells to promote GM-CSF and IFN-γ while repressing IL-10, and IL-10 derepression accounts for the impaired pathogen control and altered autoimmunity of Bhlhe40-deficient animals across EAE, Toxoplasma, and tuberculosis models [PMID:24699451, PMID:29773643, PMID:29773644]. It acts as a T-bet cofactor that accumulates at the Ifng locus and drives histone acetylation [PMID:27226296], directly binds Th1 cis-elements (Tbx21, Cxcr6) to activate them while repressing Tfh genes (Bcl6, Cxcr5) [PMID:38619295, PMID:41134666], and is required for tissue-resident/tumor-infiltrating CD8+ T-cell mitochondrial fitness, epigenetic state, and the differentiation checkpoint between exhausted subsets, making it central to anti-tumor immunity and checkpoint-blockade responsiveness [PMID:31533057, PMID:37595022]. In myeloid lineages BHLHE40 (with BHLHE41) enforces tissue-resident and alveolar macrophage identity and self-renewal by directly repressing lineage-inappropriate factors c-Maf and Mafb and promoting cell-cycle genes [PMID:31061528, PMID:31414712]. Across metabolism it represses PGC-1α transactivation via HDAC recruitment to control mitochondrial and peroxisomal function [PMID:25963661], serves as a required cofactor with C/EBPβ and LXRα for insulin-induced hepatic SREBP-1c [PMID:29952285], and controls lipogenic and ferroptosis-protective programs including direct, enhancer-promoter looping regulation of SREBF1 [PMID:18602890, PMID:38064101]. It contributes negative-feedback control of the circadian clock with tissue-specific repressor/coactivator behavior [PMID:18648504] and represses neuronal Bdnf to set seizure threshold [PMID:18234890]. In numerous tissues BHLHE40 governs differentiation and proliferation through direct targets such as MyoD-dependent myogenic genes [PMID:19522704, PMID:26468276], osteoclast factors Fos/Nfatc1 [PMID:35619122], and trophoblast programs via interaction with GATA2/3 [PMID:40911186].","teleology":[{"year":2001,"claim":"Establishing how BHLHE40 is induced was the entry point to understanding its signaling context; this work defined it as an immediate-early transcriptional target of cAMP signaling.","evidence":"Transcription/protein-synthesis inhibitor dissection across multiple cell types","pmids":["11432722"],"confidence":"Medium","gaps":["No ChIP confirmation of the regulatory element","Did not connect induction to a downstream function"]},{"year":2002,"claim":"Linking BHLHE40's DNA-binding activity to cell fate, this work showed its repressor function controls proliferation and selectively blocks mitochondrial (intrinsic) apoptosis.","evidence":"Inducible stable expression with DNA-binding mutant and procaspase activity assays under serum deprivation","pmids":["12119049"],"confidence":"Medium","gaps":["No direct target genes identified","Mechanism of caspase 3/7/9 selectivity unresolved"]},{"year":2008,"claim":"Three studies established BHLHE40 as a direct sequence-specific repressor in distinct tissues, defining its biochemical mode and circadian role.","evidence":"EMSA/ChIP at Bdnf promoter 4 with KO seizure phenotype; ChoRE promoter mapping with ChREBP feedback loop; single/double KO circadian behavioral and clock-gene analysis","pmids":["18234890","18602890","18648504"],"confidence":"High","gaps":["Cofactor requirements for repression not defined","Context determinants of repressor vs coactivator behavior in the clock unclear"]},{"year":2009,"claim":"Resolving how BHLHE40 controls muscle gene programs, this work showed it binds the PGC-1α promoter E-box, complexes with MyoD, and is relieved by P/CAF, establishing a cofactor-competition mechanism.","evidence":"EMSA, Co-IP, ChIP, and luciferase reporter with P/CAF dose-response in myogenic cells","pmids":["19522704"],"confidence":"High","gaps":["In vivo relevance to muscle differentiation not tested","Single locus focus"]},{"year":2014,"claim":"This established BHLHE40's defining immunological role: cell-intrinsic control of the GM-CSF/IL-10 balance that sets autoreactive T-cell pathogenicity.","evidence":"KO mice, T-cell rescue, and IL-10 receptor blockade epistasis in EAE","pmids":["24699451"],"confidence":"High","gaps":["Direct transcriptional targets at Il10/Csf2 not yet mapped","Mechanism distinguishing repression vs activation unclear"]},{"year":2015,"claim":"These studies dissected the BHLHE40–PGC-1α metabolic axis, showing direct binding, HDAC-mediated repression of PGC-1α transactivation, and consequences for mitochondria, peroxisomes, and ROS.","evidence":"Co-IP, ChIP, siRNA knockdown, PGC-1α-interacting domain overexpression with metabolic/organelle readouts and exercise model; plus hypoxia/p53-driven Myog repression","pmids":["25963661","26468276"],"confidence":"High","gaps":["Tissue-specific in vivo metabolic phenotypes incompletely defined","HDAC identity not specified"]},{"year":2015,"claim":"These works revealed BHLHE40 can act through SP1 rather than its own E-box, repressing EMT regulators and tumor invasion.","evidence":"Luciferase, ChIP, SP1 siRNA epistasis, and invasion assays for TWIST1/SNAI1/SNAI2 suppression","pmids":["26391953"],"confidence":"Medium","gaps":["In vivo tumor relevance limited","Generalizability of SP1-tethering mechanism not established"]},{"year":2016,"claim":"These studies extended BHLHE40's immune role upstream and downstream: IL-1β induces it to confer encephalitogenicity, and it acts as a T-bet cofactor at the Ifng locus.","evidence":"Reporter mice with adoptive transfer and IL-1R blockade; ChIP at Ifng T-box with H3K9ac and reporter assays in iNKT cells","pmids":["26834156","27226296"],"confidence":"High","gaps":["Direct vs cofactor-dependent binding modes not fully separated","Structural basis of T-bet cooperation unknown"]},{"year":2018,"claim":"A cluster of studies cemented BHLHE40 as the key transcription factor repressing IL-10 during infection and as a metabolic cofactor, while expanding its activator/repressor repertoire.","evidence":"Conditional and double-KO epistasis in Toxoplasma and M. tuberculosis; reciprocal Co-IP with C/EBPβ and LXRα for SREBP-1c induction; ChIP/Co-IP at HBEGF and CLDN1 via HDAC and SP1","pmids":["29773643","29773644","29952285","30285805","29704436"],"confidence":"High","gaps":["How a single factor switches between repression and activation context-dependently remains unresolved","Direct Il10 promoter occupancy mechanism in T cells not detailed"]},{"year":2019,"claim":"These studies defined BHLHE40's role in maintaining tissue-resident myeloid and lymphoid cell identity, fitness, and self-renewal through direct genomic occupancy.","evidence":"Competitive KO with ChIP-seq in large peritoneal and alveolar macrophages (c-Maf/Mafb repression, cell-cycle gene activation); KO with metabolic and epigenetic profiling plus anti-PD-L1 in Trm/TIL","pmids":["31061528","31414712","31533057"],"confidence":"High","gaps":["How PD-1 signaling suppresses Bhlhe40 mechanistically unclear","Determinants of locus-specific repression vs activation in macrophages not defined"]},{"year":2020,"claim":"A CRISPR screen positioned BHLHE40/41 as a negative-feedback arm opposing TFEB during lysosomal stress.","evidence":"Genome-wide CRISPR screen with TFEB localization control and lysosomal cell-death assays","pmids":["33176151"],"confidence":"Medium","gaps":["Direct target genes counter-regulated not mapped","Single-lab functional validation"]},{"year":2021,"claim":"These works expanded post-transcriptional and germinal-center control, and a tumor-suppressor link, showing lncRNA-mediated stabilization/SUMOylation and GC-restraining functions.","evidence":"RNA pull-down/RIP and SUMOylation Co-IP for SNHG1-PIAS3-Bhlhe40 in VSMC; KO immunization with GC B/TFH flow and aging lymphoma phenotype; Sirt1 promoter reporter in neural stem cells","pmids":["36194366","34919144","33987177"],"confidence":"Medium","gaps":["Physiological role of Bhlhe40 SUMOylation unclear","Mechanism of GC lymphoma development not defined"]},{"year":2022,"claim":"These studies extended BHLHE40 to bone, cardiac, and alloimmune disease through direct target genes and signaling outputs.","evidence":"ChIP at Fos/Nfatc1 with KO bone phenotype; cardiac-specific KD with NF-κB/NLRP3 and TGF-β1 readouts; KO GVHD model with GM-CSF/DC activation","pmids":["35619122","36304536","31880771"],"confidence":"Medium","gaps":["Direct vs indirect signaling effects in cardiac AF not separated","Generalizability across tissues uncertain"]},{"year":2023,"claim":"These studies sharpened BHLHE40's role in T-cell exhaustion, NK IFN-γ, β-cell insulin secretion, and drug resistance, several pinpointing indirect mechanisms (blocking another TF's binding).","evidence":"CRISPR screen defining a Tex checkpoint; STAT4/H3K4me3-driven induction and Ifng-locus ChIP in NK cells; ChIP showing attenuated PDX1 occupancy at Mafa; ChIP-seq at ABCB1 promoter; Co-IP with CCDC86 in glioma","pmids":["37595022","37830760","37341148","36931039","40837407"],"confidence":"High","gaps":["Mechanism by which BHLHE40 displaces other transcription factors (PDX1, SP1) not structurally defined","Glioma CCDC86 axis lacks ChIP confirmation"]},{"year":2024,"claim":"A large body of work resolved BHLHE40 as an architectural/transcriptional regulator across lineage decisions, metabolism, and senescence, including enhancer-promoter looping and AR-dependent tumor suppression.","evidence":"ATAC/ChIP conditional KO at Th1/Tfh cis-elements; ChIP-seq + Hi-C at SREBF1 with ferroptosis assays; ChIP/enzymatic axis to PPM1F-AMPK; AR ChIP-seq/Co-IP to CCNG2 senescence; DLAM repression across microglia/macrophage models; Nrtn promoter ChIP in asthma","pmids":["38619295","38064101","38301894","38902772","38448474","40467844"],"confidence":"High","gaps":["Genome-wide rules governing direct repression vs activation across cell types unresolved","Relative contribution of looping vs classic TF activity not generalized"]},{"year":2025,"claim":"Recent studies placed BHLHE40 in regulatory cascades (REV-ERB→Bhlhe40→c-Maf), Tfh migration circuits, and developmental differentiation via partner GATA factors.","evidence":"Epistasis with REV-ERB/c-Maf in colonic Tregs and intestinal inflammation; Bhlhe40-Pou2af1 circuit controlling CXCR5/GC migration; DNA pull-down MS/Co-IP/ChIP with GATA2/3 and CRISPR KO in trophoblast stem cells","pmids":["41359309","41134666","40911186"],"confidence":"Medium","gaps":["Whether BHLHE40-GATA cooperation generalizes beyond trophoblast unknown","Single-lab validation for each axis"]},{"year":null,"claim":"The central unresolved question is the molecular logic that switches BHLHE40 between direct E-box repression, partner-tethered (SP1/T-bet/GATA) activation or repression, and chromatin-looping architecture in a cell-type-specific manner.","evidence":"","pmids":[],"confidence":"High","gaps":["No unified model for context-dependent repressor/activator switching","No high-resolution structures of BHLHE40 with partners on DNA","Determinants of locus selection across tissues not defined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,5,9,11,17,26,28]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[9,12,13,16,42]},{"term_id":"GO:0140097","term_label":"catalytic activity, acting on DNA","supporting_discovery_ids":[11,8,18]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[30,37,40]}],"pathway":[{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[0,1,2,4,5,6,26,27]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[9,11,17,26,28]},{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[7,11,15,23,29]},{"term_id":"R-HSA-9909396","term_label":"Circadian clock","supporting_discovery_ids":[10]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[12,13,34]}],"complexes":[],"partners":["TBX21","PGC-1Α","CEBPB","LXRA","SP1","GATA2","GATA3","MYOD1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"O14503","full_name":"Class E basic helix-loop-helix protein 40","aliases":["Class B basic helix-loop-helix protein 2","bHLHb2","Differentially expressed in chondrocytes protein 1","DEC1","Enhancer-of-split and hairy-related protein 2","SHARP-2","Stimulated by retinoic acid gene 13 protein"],"length_aa":412,"mass_kda":45.5,"function":"Transcriptional repressor involved in the regulation of the circadian rhythm by negatively regulating the activity of the clock genes and clock-controlled genes (PubMed:12397359, PubMed:18411297). Acts as the negative limb of a novel autoregulatory feedback loop (DEC loop) which differs from the one formed by the PER and CRY transcriptional repressors (PER/CRY loop) (PubMed:14672706). Both these loops are interlocked as it represses the expression of PER1/2 and in turn is repressed by PER1/2 and CRY1/2 (PubMed:15193144). Represses the activity of the circadian transcriptional activator: CLOCK-BMAL1|BMAL2 heterodimer by competing for the binding to E-box elements (5'-CACGTG-3') found within the promoters of its target genes (PubMed:15560782). Negatively regulates its own expression and the expression of DBP and BHLHE41/DEC2 (PubMed:14672706). Acts as a corepressor of RXR and the RXR-LXR heterodimers and represses the ligand-induced RXRA and NR1H3/LXRA transactivation activity (PubMed:19786558). May be involved in the regulation of chondrocyte differentiation via the cAMP pathway (PubMed:19786558). Represses the transcription of NR0B2 and attentuates the transactivation of NR0B2 by the CLOCK-BMAL1 complex (PubMed:28797635). Drives the circadian rhythm of blood pressure through transcriptional repression of ATP1B1 in the cardiovascular system (PubMed:30012868)","subcellular_location":"Cytoplasm; Nucleus","url":"https://www.uniprot.org/uniprotkb/O14503/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/BHLHE40","classification":"Not Classified","n_dependent_lines":6,"n_total_lines":1208,"dependency_fraction":0.004966887417218543},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/BHLHE40","total_profiled":1310},"omim":[{"mim_id":"615128","title":"CENTROMERIC PROTEIN X; CENPX","url":"https://www.omim.org/entry/615128"},{"mim_id":"606200","title":"BASIC HELIX-LOOP-HELIX FAMILY, MEMBER E41; BHLHE41","url":"https://www.omim.org/entry/606200"},{"mim_id":"604256","title":"BASIC HELIX-LOOP-HELIX FAMILY, MEMBER E40; BHLHE40","url":"https://www.omim.org/entry/604256"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nuclear bodies","reliability":"Supported"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/BHLHE40"},"hgnc":{"alias_symbol":["DEC1","SHARP2","Clast5"],"prev_symbol":["STRA13","BHLHB2"]},"alphafold":{"accession":"O14503","domains":[{"cath_id":"4.10.280.10","chopping":"52-128","consensus_level":"high","plddt":89.719,"start":52,"end":128},{"cath_id":"-","chopping":"133-184","consensus_level":"high","plddt":81.8183,"start":133,"end":184}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O14503","model_url":"https://alphafold.ebi.ac.uk/files/AF-O14503-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O14503-F1-predicted_aligned_error_v6.png","plddt_mean":59.94},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=BHLHE40","jax_strain_url":"https://www.jax.org/strain/search?query=BHLHE40"},"sequence":{"accession":"O14503","fasta_url":"https://rest.uniprot.org/uniprotkb/O14503.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O14503/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O14503"}},"corpus_meta":[{"pmid":"35688610","id":"PMC_35688610","title":"Single-cell RNA-seq analysis reveals BHLHE40-driven pro-tumour neutrophils with hyperactivated glycolysis in pancreatic tumour microenvironment.","date":"2022","source":"Gut","url":"https://pubmed.ncbi.nlm.nih.gov/35688610","citation_count":246,"is_preprint":false},{"pmid":"31533057","id":"PMC_31533057","title":"The Transcription Factor Bhlhe40 Programs Mitochondrial Regulation of Resident CD8+ T Cell Fitness and Functionality.","date":"2019","source":"Immunity","url":"https://pubmed.ncbi.nlm.nih.gov/31533057","citation_count":199,"is_preprint":false},{"pmid":"24699451","id":"PMC_24699451","title":"Bhlhe40 controls cytokine production by T cells and is essential for pathogenicity in autoimmune neuroinflammation.","date":"2014","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/24699451","citation_count":151,"is_preprint":false},{"pmid":"29773643","id":"PMC_29773643","title":"The transcription factor Bhlhe40 is a switch of inflammatory versus antiinflammatory Th1 cell fate determination.","date":"2018","source":"The Journal of experimental medicine","url":"https://pubmed.ncbi.nlm.nih.gov/29773643","citation_count":116,"is_preprint":false},{"pmid":"29773644","id":"PMC_29773644","title":"Bhlhe40 is an essential repressor of IL-10 during Mycobacterium tuberculosis infection.","date":"2018","source":"The Journal of experimental medicine","url":"https://pubmed.ncbi.nlm.nih.gov/29773644","citation_count":101,"is_preprint":false},{"pmid":"12119049","id":"PMC_12119049","title":"Abundant expression of Dec1/stra13/sharp2 in colon carcinoma: its antagonizing role in serum deprivation-induced apoptosis and selective inhibition of procaspase activation.","date":"2002","source":"The Biochemical journal","url":"https://pubmed.ncbi.nlm.nih.gov/12119049","citation_count":97,"is_preprint":false},{"pmid":"25248482","id":"PMC_25248482","title":"DEC1/STRA13/SHARP2 and DEC2/SHARP1 coordinate physiological processes, including circadian rhythms in response to environmental stimuli.","date":"2014","source":"Current topics in developmental biology","url":"https://pubmed.ncbi.nlm.nih.gov/25248482","citation_count":89,"is_preprint":false},{"pmid":"15328513","id":"PMC_15328513","title":"The transcription factor DEC1 (stra13, SHARP2) is associated with the hypoxic response and high tumour grade in human breast cancers.","date":"2004","source":"British journal of cancer","url":"https://pubmed.ncbi.nlm.nih.gov/15328513","citation_count":87,"is_preprint":false},{"pmid":"26834156","id":"PMC_26834156","title":"IL-1-induced Bhlhe40 identifies pathogenic T helper cells in a model of autoimmune neuroinflammation.","date":"2016","source":"The Journal of experimental medicine","url":"https://pubmed.ncbi.nlm.nih.gov/26834156","citation_count":86,"is_preprint":false},{"pmid":"18648504","id":"PMC_18648504","title":"Disturbed clockwork resetting in Sharp-1 and Sharp-2 single and double mutant mice.","date":"2008","source":"PloS 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immunology","url":"https://pubmed.ncbi.nlm.nih.gov/37595022","citation_count":72,"is_preprint":false},{"pmid":"31061528","id":"PMC_31061528","title":"Bhlhe40 mediates tissue-specific control of macrophage proliferation in homeostasis and type 2 immunity.","date":"2019","source":"Nature immunology","url":"https://pubmed.ncbi.nlm.nih.gov/31061528","citation_count":68,"is_preprint":false},{"pmid":"15221940","id":"PMC_15221940","title":"The hypoxia-regulated transcription factor DEC1 (Stra13, SHARP-2) and its expression in human tissues and tumours.","date":"2004","source":"The Journal of pathology","url":"https://pubmed.ncbi.nlm.nih.gov/15221940","citation_count":55,"is_preprint":false},{"pmid":"30285805","id":"PMC_30285805","title":"BHLHE40 confers a pro-survival and pro-metastatic phenotype to breast cancer cells by modulating HBEGF secretion.","date":"2018","source":"Breast cancer research : BCR","url":"https://pubmed.ncbi.nlm.nih.gov/30285805","citation_count":53,"is_preprint":false},{"pmid":"18602890","id":"PMC_18602890","title":"Regulation of lipogenesis via BHLHB2/DEC1 and ChREBP feedback looping.","date":"2008","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/18602890","citation_count":50,"is_preprint":false},{"pmid":"23423709","id":"PMC_23423709","title":"The transcription factor DEC1 (BHLHE40/STRA13/SHARP-2) is negatively associated with TNM stage in non-small-cell lung cancer and inhibits the proliferation through cyclin D1 in A549 and BE1 cells.","date":"2013","source":"Tumour biology : the journal of the International Society for Oncodevelopmental Biology and Medicine","url":"https://pubmed.ncbi.nlm.nih.gov/23423709","citation_count":49,"is_preprint":false},{"pmid":"16672257","id":"PMC_16672257","title":"SHARP2: protein-protein interaction predictions using patch 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receptor blockade epistasis, in vitro cytokine assays in polarized Th1/Th17 cells\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (KO, adoptive transfer, receptor blockade epistasis), independently replicated in subsequent papers\",\n      \"pmids\": [\"24699451\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Bhlhe40 acts as a molecular switch determining inflammatory vs. anti-inflammatory Th1 cell fate: Bhlhe40-deficient Th1 cells produce less IFN-γ and substantially more IL-10; Bhlhe40-mediated IFN-γ production is independent of T-bet regulation; IL-10 blockade rescues Bhlhe40-deficient mice from death during Toxoplasma gondii infection.\",\n      \"method\": \"Bhlhe40 conditional KO in T cells, in vitro and in vivo cytokine measurement, IL-10 signaling blockade epistasis\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — T-cell-conditional KO with multiple in vivo epistasis experiments and in vitro validation\",\n      \"pmids\": [\"29773643\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Bhlhe40 is the first transcription factor found essential specifically to repress Il10 expression during Mycobacterium tuberculosis infection; deletion of Il10 in Bhlhe40-/- mice reverses higher bacterial burden and early lethality; Bhlhe40 deletion in T cells or CD11c+ cells is each sufficient to confer susceptibility.\",\n      \"method\": \"Bhlhe40-/- mice, Il10/Bhlhe40 double-KO epistasis, cell-type-specific deletion using Cre drivers, bacterial burden quantification\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — double-KO epistasis with cell-type specificity, replicated across infection models\",\n      \"pmids\": [\"29773644\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Bhlhe40 expression in T cells is induced by IL-1β downstream of pertussis toxin/IL-1R signaling; Bhlhe40-expressing cells exhibit an encephalitogenic transcriptional signature; PTX co-adjuvanticity in EAE is Bhlhe40 dependent, defining a PTX–IL-1β–Bhlhe40 pathway.\",\n      \"method\": \"Bhlhe40 reporter mice, TCR-transgenic adoptive transfer, IL-1β stimulation of polarized Th17 cells, in vivo IL-1R signaling blockade\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reporter mice combined with adoptive transfer and pharmacological epistasis across multiple in vivo settings\",\n      \"pmids\": [\"26834156\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Bhlhe40 is required cell-intrinsically for tissue-resident memory CD8+ T cell (Trm) and tumor-infiltrating lymphocyte (TIL) development and polyfunctionality; PD-1 signaling inhibits TIL Bhlhe40 expression; Bhlhe40 sustains mitochondrial fitness and a functional epigenetic state in Trm/TIL cells; Bhlhe40 is critical for TIL reinvigoration following anti-PD-L1 blockade.\",\n      \"method\": \"Bhlhe40 KO mice, metabolic assays, epigenetic profiling, anti-PD-L1 blockade in tumor models\",\n      \"journal\": \"Immunity\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — KO with metabolic, epigenetic, and functional readouts plus in vivo checkpoint blockade\",\n      \"pmids\": [\"31533057\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Bhlhe40 is required cell-intrinsically for self-renewal and maintenance of large peritoneal macrophages (LPMs) and for their proliferation (but not polarization) in response to IL-4; Bhlhe40 directly represses c-Maf and Mafb and promotes expression of cell-cycle genes in LPMs; genome-wide ChIP shows Bhlhe40 co-occupies PU.1 sites and unique loci including Maf and cell-cycle loci.\",\n      \"method\": \"Bhlhe40 KO mice, competitive reconstitution, IL-4/helminth infection models, ChIP-seq, gene expression analysis\",\n      \"journal\": \"Nature immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP-seq plus competitive KO with multiple in vivo disease models and proliferation assays\",\n      \"pmids\": [\"31061528\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Bhlhe40 and Bhlhe41 are required for alveolar macrophage self-renewal and identity; their loss reduces AM proliferation and down-regulates AM signature genes while inducing genes of other macrophage lineages; genome-wide Bhlhe40 DNA-binding analysis shows direct repression of lineage-inappropriate genes.\",\n      \"method\": \"Bhlhe40/41 conditional KO, competitive setting, RNA-seq, ChIP-seq/genome-wide DNA binding\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP-seq plus KO with multiple orthogonal readouts\",\n      \"pmids\": [\"31414712\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"BHLHE40 is required as a third transcription factor for insulin induction of hepatic SREBP-1c mRNA; BHLHE40 physically binds to C/EBPβ and LXRα in rat liver (co-immunoprecipitation); hepatic BHLHE40 mRNA rises rapidly upon refeeding or insulin treatment; BHLHE40 is necessary but not sufficient for SREBP-1c induction.\",\n      \"method\": \"Co-immunoprecipitation, gene knockout in mice, siRNA knockdown in hepatocytes, lentiviral overexpression, fasted/refed rat model\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP identifying binding partners, KO and siRNA with defined molecular phenotype, necessity/sufficiency dissection\",\n      \"pmids\": [\"29952285\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Bhlhe40 functions as a cofactor of T-bet to enhance IFN-γ production in iNKT cells; Bhlhe40 alone has no significant effect on Ifng promoter activity but enhances T-bet-mediated Ifng promoter activation; ChIP shows Bhlhe40 accumulates at the T-box region of the Ifng locus and promotes H3K9 acetylation there in a T-bet-dependent manner.\",\n      \"method\": \"ChIP assay, Ifng promoter-luciferase reporter, Bhlhe40-deficient mice, iNKT cell functional assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP with histone modification readout plus functional reporter assays and KO, single lab\",\n      \"pmids\": [\"27226296\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"BHLHB2/BHLHE40 binds directly to a sequence within Bdnf promoter 4 (identified by EMSA/ChIP) and mediates transcriptional repression; NMDA receptor activation reduces BHLHB2 occupancy at promoter 4 and de-represses transcription; Bhlhb2 KO mice show increased hippocampal exon-4-specific Bdnf mRNA and increased seizure susceptibility.\",\n      \"method\": \"EMSA, ChIP in hippocampal neurons, Bhlhb2 knockout mice, NMDA stimulation, kainic acid seizure model\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct DNA-binding assay (EMSA+ChIP) plus KO phenotype with multiple orthogonal methods\",\n      \"pmids\": [\"18234890\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"SHARP-1 and SHARP-2 (Bhlhe40) single and double mutant mice display altered circadian period length, tissue-specific clock gene expression, and entrainment kinetics; SHARP-1/2 can serve as both repressors and co-activators of mammalian clock gene expression in a context-specific manner, shown by differential Per2 amplitude changes across tissues.\",\n      \"method\": \"Sharp-1 and Sharp-2 single/double KO mice, in vivo EEG/wheel-running, light-pulse entrainment, tissue-specific clock gene expression\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic dissection with single/double KO and multiple tissue/behavioral readouts\",\n      \"pmids\": [\"18648504\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Bhlhe40 binds to PGC-1α directly and co-occupies PGC-1α-targeted gene promoters/enhancers to repress PGC-1α transactivational activity; repression is mediated by recruiting HDACs and preventing relief of PGC-1α intramolecular suppression; Bhlhe40 knockdown increases ROS, fatty acid oxidation, mitochondrial DNA, and PGC-1α target gene expression; exercise reduces Bhlhe40 recruitment to these loci.\",\n      \"method\": \"Co-immunoprecipitation, ChIP, siRNA knockdown, PGC-1α-interacting domain overexpression, exercise model in skeletal muscle\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct protein-protein interaction (Co-IP) plus ChIP plus KD with multiple metabolic readouts\",\n      \"pmids\": [\"25963661\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Bhlhe40 binds to the E1-box on the PGC-1α core promoter (confirmed by EMSA) and forms a complex with MyoD; Bhlhe40 represses MyoD-mediated transactivation of PGC-1α and myogenic gene promoters; P/CAF relieves this repression by interacting with Bhlhe40, thereby disrupting the P/CAF–MyoD interaction.\",\n      \"method\": \"EMSA, co-immunoprecipitation, ChIP in myogenic cells, luciferase reporter assays, P/CAF dose-response\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — EMSA + Co-IP + ChIP + reporter in same study, mechanistic detail on cofactor competition\",\n      \"pmids\": [\"19522704\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Bhlhe40 is induced by hypoxia in satellite cell-derived primary myoblasts through a p53-dependent (HIF1α-independent) pathway; Bhlhe40 binds to proximal E-boxes of the Myog promoter, reduces MyoD binding affinity and transcriptional activity, thereby inhibiting myogenic differentiation; Bhlhe40 knockdown rescues myogenic differentiation under hypoxia.\",\n      \"method\": \"Microarray, ChIP, Bhlhe40 overexpression/knockdown, Myog promoter binding assays, HIF1α inhibition, p53 pathway analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus functional KD rescue under hypoxia, pathway dissection with HIF1α and p53, single lab\",\n      \"pmids\": [\"26468276\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"BHLHE40 differentially regulates peroxisome and mitochondria in myogenic cells: Bhlhe40 knockdown increases peroxisome number/activity but reduces mitochondrial efficiency and bursts ROS; a constitutively active PGC-1α-interacting domain (VBH135) of Bhlhe40 mimics peroxisome effects while simultaneously reducing ROS and increasing mitochondrial efficiency.\",\n      \"method\": \"Bhlhe40 siRNA knockdown, VBH135 constitutively-active domain overexpression, organelle activity assays, ROS measurement, fatty acid oxidation assays, gene expression profiling\",\n      \"journal\": \"Redox biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — functional domain-based dissection with multiple organelle readouts, single lab\",\n      \"pmids\": [\"30391825\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"BHLHB2/BHLHE40 is induced by glucose and ChREBP in rat hepatocytes via a functional ChoRE element (-160 to -143 bp) in the Bhlhb2 promoter; BHLHB2 in turn binds ChoRE in Fasn, Lpk, and Bhlhb2 promoters (shown by ChIP) and represses glucose/ChREBP-mediated induction of lipogenic genes, forming a negative feedback loop with ChREBP.\",\n      \"method\": \"Promoter deletion analysis, ChIP, Bhlhb2 overexpression in hepatocytes, mRNA quantification\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — ChIP plus promoter deletion, single lab, limited orthogonal validation\",\n      \"pmids\": [\"18602890\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"DEC1/BHLHE40 requires its DNA-binding domain for both proliferation inhibition and anti-apoptotic activity; stable DEC1 expression selectively inhibits activation of procaspases 3, 7, and 9 (mitochondrial pathway) but not procaspase 8, blocking mitochondria-initiated apoptosis; a DNA-binding-domain mutant loses both activities.\",\n      \"method\": \"Tetracycline-inducible stable transfection, procaspase activity enzymatic assays, immunoblotting, serum deprivation apoptosis model, DNA-binding mutant\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — enzymatic assays plus mutagenesis with inducible expression system, single lab\",\n      \"pmids\": [\"12119049\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"BHLHE40/41 suppress TWIST1 transcription by competing with SP1 for DNA binding at a critical TWIST1 promoter region; SP1 mediates basal TWIST1 transcriptional activity at the -233 to -61 bp region; BHLHE40/41 also suppress SNAI1 and SNAI2, inhibiting EMT and tumor cell invasion.\",\n      \"method\": \"Luciferase reporter assay, ChIP, BHLHE40/41 overexpression/knockdown, invasion assays, SP1 siRNA epistasis\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reporter plus ChIP plus SP1 epistasis, single lab\",\n      \"pmids\": [\"26391953\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"BHLHE40 induces HBEGF transcription by blocking DNA binding of HDAC1 and HDAC2 to the HBEGF promoter (shown by ChIP and CoIP); HBEGF is secreted through exosomes and promotes breast cancer cell survival and migration; BHLHE40 knockdown/KO reduces primary tumor growth and lung metastasis in orthotopic xenograft models.\",\n      \"method\": \"ChIP, co-immunoprecipitation, shRNA knockdown, CRISPR/Cas9 KO, xenograft and metastasis models, exosome analysis\",\n      \"journal\": \"Breast cancer research : BCR\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP + Co-IP + in vivo models, single lab\",\n      \"pmids\": [\"30285805\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"BHLHE40 suppresses CLDN1 transcription not by direct E-box binding but by interacting with SP1 (shown by co-immunoprecipitation and co-localization) and preventing SP1 from binding a specific motif (-233 to -61 bp) in the CLDN1 promoter; the BHLH and Orange domains of BHLHE40 are both required for the BHLHE40–SP1 interaction.\",\n      \"method\": \"Co-immunoprecipitation, reporter assays, siRNA for SP1 epistasis, deletion mutagenesis of BHLHE40 domains, invasion assays\",\n      \"journal\": \"Molecular carcinogenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus domain mutagenesis plus reporter/epistasis, single lab\",\n      \"pmids\": [\"29704436\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"BHLHE40 regulates a differentiation checkpoint between progenitor and intermediate exhausted CD8+ T cell (Tex) subsets; identified by genome-wide CRISPR screen in a benchmarked in vitro chronic stimulation model and validated in vivo.\",\n      \"method\": \"In vitro CRISPR pooled screen, in vitro/in vivo validation, phenotypic/transcriptional/epigenetic benchmarking\",\n      \"journal\": \"Science immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genome-wide CRISPR screen with in vitro and in vivo validation, multiple orthogonal benchmarking methods\",\n      \"pmids\": [\"37595022\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"BHLHE40 represses MAFA expression in hypoxic pancreatic β-cells by attenuating PDX1 binding to the Mafa enhancer region, thereby suppressing insulin secretion; BHLHE40 deficiency in hypoxic MIN6 cells or ob/ob mouse β-cells reverses insulin secretion defects; MAFA re-expression rescues impaired insulin secretion.\",\n      \"method\": \"BHLHE40 KO in MIN6 cells and ob/ob mice, ChIP for PDX1 occupancy, MAFA re-expression rescue, insulin secretion assays\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP showing indirect mechanism, KO in two systems, rescue experiment with defined molecular target\",\n      \"pmids\": [\"37341148\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"BHLHE40 and BHLHE41, upregulated by high sustained nuclear TFEB, act in opposition to TFEB upon lysosomal cell death induction; BHLHE40/41 counter-regulate TFEB target genes, adding a negative feedback loop to TFEB regulatory mechanisms.\",\n      \"method\": \"Genome-wide CRISPR library screen, TFEB subcellular localization control, lysosomal cell death assays, gene expression analysis\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genome-wide CRISPR screen with functional validation in lysosomal death assay, single lab\",\n      \"pmids\": [\"33176151\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"BHLHE40 regulates SREBF1 transcription both as a classic transcription factor and by physically linking SREBF1 enhancer and promoter regions; the BHLHE40–SREBF1–stearoyl-CoA desaturase axis protects pancreatic cancer cells from ferroptosis by reducing lipid peroxidation.\",\n      \"method\": \"ChIP-seq, RNA-seq, Hi-C/chromosome conformation capture, BHLHE40 KO, ferroptosis assays, lipid peroxidation measurement\",\n      \"journal\": \"Advanced science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — ChIP-seq + Hi-C chromosome conformation capture + KO with functional ferroptosis readout, single lab\",\n      \"pmids\": [\"38064101\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Bhlhe40 is required in CD4+ T cells for GM-CSF production during graft-versus-host disease; GM-CSF (regulated by Bhlhe40) is independent of IL-6 and IL-23 signaling; mechanistically, GM-CSF produced by Bhlhe40+ T cells enhances donor dendritic cell activation in the colon, promotes indirect alloantigen presentation, and drives proinflammatory T cell accumulation.\",\n      \"method\": \"Bhlhe40 KO in GVHD model, cytokine blockade epistasis, DC activation and alloantigen presentation assays, colonic inflammation readouts\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO with cellular mechanistic readouts and cytokine epistasis, single lab\",\n      \"pmids\": [\"31880771\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Bhlhe40 is a cell-intrinsic negative regulator of both the B cell and T cell sides of the germinal center reaction: in activated CD4 T cells it restrains proliferation (limiting TFH numbers), and in B cells it selectively restricts generation of the earliest GC B cells; Bhlhe40-deficient mice develop B cell lymphoma with age.\",\n      \"method\": \"Bhlhe40 KO mice, immunization, flow cytometry for GC B/TFH cells, adoptive transfer, proliferation assays\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO with defined cellular phenotypes and time-course analysis of GC reaction, single lab\",\n      \"pmids\": [\"34919144\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Bhlhe40 directly binds cis-regulatory elements of Th1-related genes (Tbx21, Cxcr6) to activate their expression and binds regions of Tfh-related genes (Bcl6, Cxcr5) to repress them; CD4+ T cell-specific Bhlhe40 deletion abrogates Th1 but augments Tfh differentiation and GC B cell help during LCMV infection.\",\n      \"method\": \"CD4-Cre conditional KO, epigenetic profiling (ATAC-seq/ChIP), antigen-specific T cell analysis after LCMV infection, gene expression analysis\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — epigenetic profiling with direct cis-element binding evidence plus conditional KO with multiple lineage readouts\",\n      \"pmids\": [\"38619295\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"STAT4 promotes Bhlhe40 induction in NK cells during mouse CMV infection by enriching H3K4me3 at the Bhlhe40 promoter; Bhlhe40 directly promotes IFN-γ production by binding throughout the Ifng locus in activated NK cells; Bhlhe40-deficient NK cells show impaired IFN-γ production and diminished protective immunity.\",\n      \"method\": \"ChIP for STAT4 and H3K4me3 at Bhlhe40 promoter, ChIP for Bhlhe40 at Ifng locus, Bhlhe40 KO NK cell functional assays, viral challenge model\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct ChIP evidence at multiple genomic loci plus KO with in vivo viral challenge\",\n      \"pmids\": [\"37830760\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Bhlhe40 promotes osteoclastogenesis by directly binding to promoter regions of c-Fos (Fos) and Nfatc1 and upregulating their expression; inhibition of Fos/Nfatc1 abrogates enhanced osteoclast differentiation induced by BHLHE40 overexpression; Bhlhe40-deficient mice have increased bone mass and decreased osteoclast bone resorption in vivo.\",\n      \"method\": \"ChIP for Bhlhe40 at Fos/Nfatc1 promoters, BHLHE40 overexpression, Bhlhe40 KO mice (micro-CT, histomorphometry), Fos/Nfatc1 inhibition epistasis\",\n      \"journal\": \"Cell & bioscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus KO phenotype plus epistasis, single lab\",\n      \"pmids\": [\"35619122\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"BHLHE40 directly suppresses PPM1F transcription; loss of Bhlhe40 leads to AMPKα dephosphorylation (via elevated PPM1F), enhanced PDHA1 Ser293 phosphorylation, and increased LDH activity, shifting metabolism toward glycolysis; the BHLHE40–PPM1F–AMPK axis thus modulates energy metabolism in endometrial cancer cells.\",\n      \"method\": \"Bhlhe40 knockdown, AMPKα phosphorylation assays, PDH/LDH activity assays, ChIP for BHLHE40 at PPM1F promoter, immunohistochemistry\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct promoter ChIP plus enzymatic activity assays and phosphorylation mapping, single lab\",\n      \"pmids\": [\"38301894\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"BHLHE40 in H. pylori-infected gastric epithelial cells translocates to the nucleus and binds cagA-activated p-STAT3 (Tyr705); the BHLHE40–p-STAT3 complex increases CXCL12 expression, which fosters CD4+ T cell infiltration in gastric mucosa, defining a cagA–BHLHE40–CXCL12 inflammatory axis.\",\n      \"method\": \"Co-immunoprecipitation, ChIP for BHLHE40 at CXCL12 promoter, H. pylori infection model in vivo and in vitro, cagA pathway inhibition\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP + ChIP + in vivo infection model, single lab\",\n      \"pmids\": [\"31914631\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"DEC1/BHLHE40 mRNA is rapidly and directly induced by the cAMP pathway (PTH, Bt2cAMP, forskolin) in chondrocytes and multiple cell types; actinomycin D and cycloheximide studies show the induction is at the transcriptional level and does not require new protein synthesis, identifying DEC1 as a direct cAMP target gene.\",\n      \"method\": \"Northern blot/RT-PCR in multiple cell types, actinomycin D (transcriptional inhibition), cycloheximide (protein synthesis inhibition), promoter analysis\",\n      \"journal\": \"European journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — pharmacological dissection with multiple cell types, no ChIP; replicated across cell lines\",\n      \"pmids\": [\"11432722\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"BHLHE40 is a primary, dynamically regulated transcriptional target of the vitamin D receptor (VDR); the VDR binding site is located 1.7 kb upstream of the BHLHE40 transcription start site; 1α,25(OH)2D3 treatment significantly opens chromatin at this site and up-regulates BHLHE40 mRNA with a short half-life of ~0.9 h.\",\n      \"method\": \"Genome-wide VDR ChIP-seq, ATAC/open chromatin analysis, histone modification data, mRNA stability assay, trichostatin A treatment\",\n      \"journal\": \"The Journal of steroid biochemistry and molecular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP-seq with chromatin accessibility readout and mRNA stability measurement, single lab\",\n      \"pmids\": [\"23220548\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"BHLHE40 directly binds the ABCB1 gene promoter (-1605 to -1597) and represses its transcription; BHLHE40 expression is negatively correlated with ABCB1 in cancer cells; BHLHE40 overexpression resensitizes adriamycin-resistant cells to the drug while KD induces resistance, defining BHLHE40 as a transcriptional suppressor of P-gp-mediated multidrug resistance.\",\n      \"method\": \"ChIP-seq for BHLHE40 occupancy at ABCB1 promoter, overexpression and knockdown in resistant cell lines, apoptosis and drug sensitivity assays, in vivo xenograft\",\n      \"journal\": \"Neoplasia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP-seq plus gain/loss-of-function with in vivo validation, single lab\",\n      \"pmids\": [\"36931039\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"BHLHE40 interacts directly with GATA2 and GATA3 to facilitate their chromatin occupancy and activates transcriptional programs essential for syncytiotrophoblast differentiation, including CGB; CRISPR/Cas9 KO of BHLHE40 in trophoblast stem cells prevents STB differentiation and impairs hormone synthesis and syncytialization.\",\n      \"method\": \"DNA pull-down coupled with mass spectrometry, Co-immunoprecipitation, CRISPR/Cas9 KO, ChIP for GATA2/3 occupancy, trophoblast differentiation assays\",\n      \"journal\": \"Advanced science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mass-spec protein identification + Co-IP + ChIP + KO with functional differentiation readout, single lab\",\n      \"pmids\": [\"40911186\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"REV-ERB promotes colonic RORγt+Foxp3+ Treg differentiation by suppressing Bhlhe40 expression; Bhlhe40 in turn inhibits c-Maf, a key factor for colonic Treg differentiation and function; the Bhlhe40–c-Maf axis also regulates IL-10 and CTLA-4 expression in Tregs, placing Bhlhe40 as a negative intermediary in the REV-ERB→Bhlhe40→c-Maf pathway.\",\n      \"method\": \"REV-ERB KO, Bhlhe40 overexpression/knockdown in Tregs, c-Maf rescue experiments, intestinal inflammation models (TNBS, oxazolone), cytokine measurement\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — epistasis with KO/OE cascade and in vivo disease model, single lab\",\n      \"pmids\": [\"41359309\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Loss/reduction of BHLHE40/41 in iPSC-derived microglia, THP-1 macrophages, and mouse microglia increases expression of disease-associated macrophage (DLAM) genes involved in cholesterol clearance and lysosomal processing, increases cholesterol efflux and storage, and increases lysosomal mass and degradative capacity, revealing BHLHE40/41 as repressors of the DLAM response.\",\n      \"method\": \"Gene KO/knockdown in iPSC microglia and THP-1 macrophages, mouse microglia Bhlhe40/41 KO, cholesterol efflux assays, lysosomal mass assays, transcriptomic analysis\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO across multiple human and mouse cell models with functional metabolic readouts, single lab\",\n      \"pmids\": [\"38448474\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"In vascular smooth muscle cells, lncRNA SNHG1 stabilizes Bhlhe40 mRNA by directly interacting with its 3'-UTR and also promotes Bhlhe40 nuclear translocation by scaffolding SUMO E3 ligase PIAS3 to facilitate Bhlhe40 SUMOylation; nuclear Bhlhe40 then suppresses Atg10 transcription to reduce autophagosome formation.\",\n      \"method\": \"RNA pull-down, RNA immunoprecipitation, RNA stability assay, luciferase reporter, co-immunoprecipitation, Western blot, Bhlhe40 knockdown/overexpression\",\n      \"journal\": \"Journal of physiology and biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — multiple RNA-protein interaction assays plus Co-IP for SUMOylation scaffold, single lab\",\n      \"pmids\": [\"36194366\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Bhlhe40 promotes alternative macrophage activation in asthma by directly binding the Neurturin (Nrtn) promoter and reducing its transcriptional activity; Bhlhe40 knockdown reduces OVA-induced lung inflammation, and simultaneous knockdown of Nrtn reverses this protective effect.\",\n      \"method\": \"Dual luciferase assay, ChIP-qPCR for Bhlhe40 at Nrtn promoter, Bhlhe40 KD in vivo and in vitro, Nrtn KD epistasis, OVA asthma model\",\n      \"journal\": \"Communications biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct promoter binding by ChIP-qPCR plus epistasis in vivo, single lab\",\n      \"pmids\": [\"40467844\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Cardiac-specific knockdown of Bhlhe40 attenuates Ang II-induced atrial fibrillation; mechanistically, Bhlhe40 KD inhibits NF-κB/NLRP3 signaling, TGF-β1/Smad2 signaling, reduces CX43 expression, and prevents Kv4.3 downregulation in atria.\",\n      \"method\": \"rAAV9-shBhlhe40 cardiac-specific KD, echocardiography, programmed electrical stimulation, histology, Western blot for signaling pathway components\",\n      \"journal\": \"Frontiers in cardiovascular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — cardiac-specific KD with mechanistic signaling pathway readouts in vivo, single lab\",\n      \"pmids\": [\"36304536\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"BHLHE40 is a novel direct androgen receptor (AR) target gene (shown by ChIP-seq); BHLHE40 physically interacts with AR (Co-IP) and co-translocates into the nucleus upon supraphysiological androgen (SAL) treatment; BHLHE40 mediates SAL-induced cellular senescence; downstream, BHLHE40 directly targets cyclin G2 (CCNG2) to execute senescence, defining an AR–BHLHE40–CCNG2 tumor-suppressive axis.\",\n      \"method\": \"RNA-seq, ChIP-seq (AR binding to BHLHE40 gene; BHLHE40 binding to CCNG2), Co-immunoprecipitation, nuclear translocation assay, BHLHE40 KD, in vivo xenograft\",\n      \"journal\": \"Journal of experimental & clinical cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP-seq + Co-IP + KD with in vivo validation, single lab\",\n      \"pmids\": [\"38902772\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Bhlhe40 directly binds to and negatively regulates Sirt1 promoter activity (shown by luciferase reporter); the Bhlhe40/Sirt1 axis regulates mitophagy in neural stem cells; loss of Sirt1 downstream of elevated Bhlhe40 impairs autophagy and contributes to spina bifida aperta.\",\n      \"method\": \"Luciferase reporter assay (Bhlhe40 binding to Sirt1 promoter), RNA-seq, Sirt1 activator (resveratrol) rescue, immunofluorescence for autophagy markers, ATRA-induced rat NTD model\",\n      \"journal\": \"Frontiers in cell and developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — direct promoter reporter plus in vivo rescue, limited binding confirmation, single lab\",\n      \"pmids\": [\"33987177\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"DEC1/BHLHE40 binds directly to the promoter region of cyclin D1 in A549 lung cancer cells (shown by ChIP); DEC1 overexpression down-regulates cyclin D1, while DEC1 knockdown up-regulates it, inhibiting or promoting cell growth respectively.\",\n      \"method\": \"ChIP for DEC1 at cyclin D1 promoter, siRNA knockdown, DEC1 overexpression, colony formation and growth assays\",\n      \"journal\": \"Tumour biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — ChIP plus gain/loss-of-function but single target/single lab\",\n      \"pmids\": [\"23423709\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Bhlhe40 regulates CXCR5 expression and Tfh cell migration into germinal centers by repressing Pou2af1 expression; Pou2af1 promotes Tfh formation and GC entry by upregulating CXCR5 (but not Bcl6); this Bhlhe40–Pou2af1 circuit is distinct from the Bcl6–Blimp1 fate-determination circuit.\",\n      \"method\": \"RNA-seq of antigen-specific Tfh cells in vivo (LCMV), Bhlhe40 and Pou2af1 KO/overexpression, epigenetic profiling, CXCR5 expression and GC migration assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo KO with transcriptomic profiling and functional GC migration readout, single lab\",\n      \"pmids\": [\"41134666\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"BHLHE40 directly binds to the promoter of GRIN2D and activates its transcription in gastric cancer; BHLHE40/GRIN2D axis promotes glycolysis via p38 MAPK phosphorylation and calcium efflux; GRIN2D overexpression reverses the anti-tumor effects of BHLHE40 knockdown.\",\n      \"method\": \"ChIP for BHLHE40 at GRIN2D promoter, BHLHE40/GRIN2D KD and rescue, glycolysis assays, calcium efflux measurement, in vivo tumor model\",\n      \"journal\": \"Functional & integrative genomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — ChIP plus rescue epistasis, single lab, limited mechanistic depth\",\n      \"pmids\": [\"39546079\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"BHLHE40 binds to the NLRP3 promoter as a negative transcriptional regulator (shown by Western blot/bioinformatics in smooth muscle cells); empagliflozin increases BHLHE40 expression to inhibit NLRP3 inflammasome activation and reduce vascular calcification; NLRP3 KO abolishes the protective effect.\",\n      \"method\": \"Western blot, bioinformatics binding analysis, NLRP3 KO mice (STZ model), db/db mouse model, EMPA treatment, high-glucose VSMC in vitro\",\n      \"journal\": \"Acta pharmacologica Sinica\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — promoter binding inferred from bioinformatics + Western blot without direct ChIP; single lab\",\n      \"pmids\": [\"38172306\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"In glioma, CCDC86 interacts with BHLHE40 (Co-IP) and stabilizes ATF3 expression through BHLHE40-mediated transcriptional regulation of ATF3; this CCDC86–BHLHE40–ATF3 axis activates ERK signaling and aerobic glycolysis to drive tumor progression.\",\n      \"method\": \"Co-immunoprecipitation of CCDC86 and BHLHE40, BHLHE40/ATF3 KD, ERK signaling assays, glycolysis assays, in vitro/in vivo glioma models\",\n      \"journal\": \"Genes & diseases\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — Co-IP without ChIP confirmation of direct transcriptional mechanism, single lab\",\n      \"pmids\": [\"40837407\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"BHLHE40 (also known as BHLHB2, SHARP2, DEC1, STRA13) is a basic helix-loop-helix transcriptional repressor and, context-dependently, activator that binds E-box elements and non-E-box sites via protein-protein interactions (e.g., with SP1, T-bet, PGC-1α, C/EBPβ, LXRα, GATA2/3, AR); it is a central regulator of immune cell cytokine output (repressing IL-10 while promoting IFN-γ and GM-CSF in T and NK cells), controls tissue-resident macrophage and alveolar macrophage identity and self-renewal by repressing lineage-inappropriate genes (c-Maf, Mafb) and promoting cell-cycle gene expression, sustains CD8+ Trm and TIL mitochondrial fitness and epigenetic state required for anti-tumor immunity, modulates circadian clock amplitude and entrainment as a negative-feedback repressor competing with CLOCK:BMAL1, and regulates metabolism in multiple tissues by repressing PGC-1α activity (via HDAC recruitment), suppressing lipogenic genes (FASN, LPK via ChoRE competition with ChREBP), and acting as a required co-factor (with C/EBPβ and LXRα) for insulin-induced SREBP-1c expression in liver.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"BHLHE40 (also DEC1/SHARP-2/BHLHB2) is a basic helix-loop-helix transcription factor that operates as both a direct repressor and a context-dependent activator, integrating immune, metabolic, circadian, and developmental gene programs through E-box binding and through protein-protein interactions that redirect it to non-E-box loci [#9, #11, #17]. In the immune system it is a master rheostat of cytokine output: it is required cell-intrinsically in T cells to promote GM-CSF and IFN-\\u03b3 while repressing IL-10, and IL-10 derepression accounts for the impaired pathogen control and altered autoimmunity of Bhlhe40-deficient animals across EAE, Toxoplasma, and tuberculosis models [#0, #1, #2]. It acts as a T-bet cofactor that accumulates at the Ifng locus and drives histone acetylation [#8], directly binds Th1 cis-elements (Tbx21, Cxcr6) to activate them while repressing Tfh genes (Bcl6, Cxcr5) [#26, #43], and is required for tissue-resident/tumor-infiltrating CD8+ T-cell mitochondrial fitness, epigenetic state, and the differentiation checkpoint between exhausted subsets, making it central to anti-tumor immunity and checkpoint-blockade responsiveness [#4, #20]. In myeloid lineages BHLHE40 (with BHLHE41) enforces tissue-resident and alveolar macrophage identity and self-renewal by directly repressing lineage-inappropriate factors c-Maf and Mafb and promoting cell-cycle genes [#5, #6]. Across metabolism it represses PGC-1\\u03b1 transactivation via HDAC recruitment to control mitochondrial and peroxisomal function [#11], serves as a required cofactor with C/EBP\\u03b2 and LXR\\u03b1 for insulin-induced hepatic SREBP-1c [#7], and controls lipogenic and ferroptosis-protective programs including direct, enhancer-promoter looping regulation of SREBF1 [#15, #23]. It contributes negative-feedback control of the circadian clock with tissue-specific repressor/coactivator behavior [#10] and represses neuronal Bdnf to set seizure threshold [#9]. In numerous tissues BHLHE40 governs differentiation and proliferation through direct targets such as MyoD-dependent myogenic genes [#12, #13], osteoclast factors Fos/Nfatc1 [#28], and trophoblast programs via interaction with GATA2/3 [#34].\",\n  \"teleology\": [\n    {\n      \"year\": 2001,\n      \"claim\": \"Establishing how BHLHE40 is induced was the entry point to understanding its signaling context; this work defined it as an immediate-early transcriptional target of cAMP signaling.\",\n      \"evidence\": \"Transcription/protein-synthesis inhibitor dissection across multiple cell types\",\n      \"pmids\": [\"11432722\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No ChIP confirmation of the regulatory element\", \"Did not connect induction to a downstream function\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Linking BHLHE40's DNA-binding activity to cell fate, this work showed its repressor function controls proliferation and selectively blocks mitochondrial (intrinsic) apoptosis.\",\n      \"evidence\": \"Inducible stable expression with DNA-binding mutant and procaspase activity assays under serum deprivation\",\n      \"pmids\": [\"12119049\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No direct target genes identified\", \"Mechanism of caspase 3/7/9 selectivity unresolved\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Three studies established BHLHE40 as a direct sequence-specific repressor in distinct tissues, defining its biochemical mode and circadian role.\",\n      \"evidence\": \"EMSA/ChIP at Bdnf promoter 4 with KO seizure phenotype; ChoRE promoter mapping with ChREBP feedback loop; single/double KO circadian behavioral and clock-gene analysis\",\n      \"pmids\": [\"18234890\", \"18602890\", \"18648504\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cofactor requirements for repression not defined\", \"Context determinants of repressor vs coactivator behavior in the clock unclear\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Resolving how BHLHE40 controls muscle gene programs, this work showed it binds the PGC-1\\u03b1 promoter E-box, complexes with MyoD, and is relieved by P/CAF, establishing a cofactor-competition mechanism.\",\n      \"evidence\": \"EMSA, Co-IP, ChIP, and luciferase reporter with P/CAF dose-response in myogenic cells\",\n      \"pmids\": [\"19522704\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo relevance to muscle differentiation not tested\", \"Single locus focus\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"This established BHLHE40's defining immunological role: cell-intrinsic control of the GM-CSF/IL-10 balance that sets autoreactive T-cell pathogenicity.\",\n      \"evidence\": \"KO mice, T-cell rescue, and IL-10 receptor blockade epistasis in EAE\",\n      \"pmids\": [\"24699451\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct transcriptional targets at Il10/Csf2 not yet mapped\", \"Mechanism distinguishing repression vs activation unclear\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"These studies dissected the BHLHE40\\u2013PGC-1\\u03b1 metabolic axis, showing direct binding, HDAC-mediated repression of PGC-1\\u03b1 transactivation, and consequences for mitochondria, peroxisomes, and ROS.\",\n      \"evidence\": \"Co-IP, ChIP, siRNA knockdown, PGC-1\\u03b1-interacting domain overexpression with metabolic/organelle readouts and exercise model; plus hypoxia/p53-driven Myog repression\",\n      \"pmids\": [\"25963661\", \"26468276\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Tissue-specific in vivo metabolic phenotypes incompletely defined\", \"HDAC identity not specified\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"These works revealed BHLHE40 can act through SP1 rather than its own E-box, repressing EMT regulators and tumor invasion.\",\n      \"evidence\": \"Luciferase, ChIP, SP1 siRNA epistasis, and invasion assays for TWIST1/SNAI1/SNAI2 suppression\",\n      \"pmids\": [\"26391953\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vivo tumor relevance limited\", \"Generalizability of SP1-tethering mechanism not established\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"These studies extended BHLHE40's immune role upstream and downstream: IL-1\\u03b2 induces it to confer encephalitogenicity, and it acts as a T-bet cofactor at the Ifng locus.\",\n      \"evidence\": \"Reporter mice with adoptive transfer and IL-1R blockade; ChIP at Ifng T-box with H3K9ac and reporter assays in iNKT cells\",\n      \"pmids\": [\"26834156\", \"27226296\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct vs cofactor-dependent binding modes not fully separated\", \"Structural basis of T-bet cooperation unknown\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"A cluster of studies cemented BHLHE40 as the key transcription factor repressing IL-10 during infection and as a metabolic cofactor, while expanding its activator/repressor repertoire.\",\n      \"evidence\": \"Conditional and double-KO epistasis in Toxoplasma and M. tuberculosis; reciprocal Co-IP with C/EBP\\u03b2 and LXR\\u03b1 for SREBP-1c induction; ChIP/Co-IP at HBEGF and CLDN1 via HDAC and SP1\",\n      \"pmids\": [\"29773643\", \"29773644\", \"29952285\", \"30285805\", \"29704436\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How a single factor switches between repression and activation context-dependently remains unresolved\", \"Direct Il10 promoter occupancy mechanism in T cells not detailed\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"These studies defined BHLHE40's role in maintaining tissue-resident myeloid and lymphoid cell identity, fitness, and self-renewal through direct genomic occupancy.\",\n      \"evidence\": \"Competitive KO with ChIP-seq in large peritoneal and alveolar macrophages (c-Maf/Mafb repression, cell-cycle gene activation); KO with metabolic and epigenetic profiling plus anti-PD-L1 in Trm/TIL\",\n      \"pmids\": [\"31061528\", \"31414712\", \"31533057\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How PD-1 signaling suppresses Bhlhe40 mechanistically unclear\", \"Determinants of locus-specific repression vs activation in macrophages not defined\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"A CRISPR screen positioned BHLHE40/41 as a negative-feedback arm opposing TFEB during lysosomal stress.\",\n      \"evidence\": \"Genome-wide CRISPR screen with TFEB localization control and lysosomal cell-death assays\",\n      \"pmids\": [\"33176151\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct target genes counter-regulated not mapped\", \"Single-lab functional validation\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"These works expanded post-transcriptional and germinal-center control, and a tumor-suppressor link, showing lncRNA-mediated stabilization/SUMOylation and GC-restraining functions.\",\n      \"evidence\": \"RNA pull-down/RIP and SUMOylation Co-IP for SNHG1-PIAS3-Bhlhe40 in VSMC; KO immunization with GC B/TFH flow and aging lymphoma phenotype; Sirt1 promoter reporter in neural stem cells\",\n      \"pmids\": [\"36194366\", \"34919144\", \"33987177\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Physiological role of Bhlhe40 SUMOylation unclear\", \"Mechanism of GC lymphoma development not defined\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"These studies extended BHLHE40 to bone, cardiac, and alloimmune disease through direct target genes and signaling outputs.\",\n      \"evidence\": \"ChIP at Fos/Nfatc1 with KO bone phenotype; cardiac-specific KD with NF-\\u03baB/NLRP3 and TGF-\\u03b21 readouts; KO GVHD model with GM-CSF/DC activation\",\n      \"pmids\": [\"35619122\", \"36304536\", \"31880771\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct vs indirect signaling effects in cardiac AF not separated\", \"Generalizability across tissues uncertain\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"These studies sharpened BHLHE40's role in T-cell exhaustion, NK IFN-\\u03b3, \\u03b2-cell insulin secretion, and drug resistance, several pinpointing indirect mechanisms (blocking another TF's binding).\",\n      \"evidence\": \"CRISPR screen defining a Tex checkpoint; STAT4/H3K4me3-driven induction and Ifng-locus ChIP in NK cells; ChIP showing attenuated PDX1 occupancy at Mafa; ChIP-seq at ABCB1 promoter; Co-IP with CCDC86 in glioma\",\n      \"pmids\": [\"37595022\", \"37830760\", \"37341148\", \"36931039\", \"40837407\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which BHLHE40 displaces other transcription factors (PDX1, SP1) not structurally defined\", \"Glioma CCDC86 axis lacks ChIP confirmation\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"A large body of work resolved BHLHE40 as an architectural/transcriptional regulator across lineage decisions, metabolism, and senescence, including enhancer-promoter looping and AR-dependent tumor suppression.\",\n      \"evidence\": \"ATAC/ChIP conditional KO at Th1/Tfh cis-elements; ChIP-seq + Hi-C at SREBF1 with ferroptosis assays; ChIP/enzymatic axis to PPM1F-AMPK; AR ChIP-seq/Co-IP to CCNG2 senescence; DLAM repression across microglia/macrophage models; Nrtn promoter ChIP in asthma\",\n      \"pmids\": [\"38619295\", \"38064101\", \"38301894\", \"38902772\", \"38448474\", \"40467844\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Genome-wide rules governing direct repression vs activation across cell types unresolved\", \"Relative contribution of looping vs classic TF activity not generalized\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Recent studies placed BHLHE40 in regulatory cascades (REV-ERB\\u2192Bhlhe40\\u2192c-Maf), Tfh migration circuits, and developmental differentiation via partner GATA factors.\",\n      \"evidence\": \"Epistasis with REV-ERB/c-Maf in colonic Tregs and intestinal inflammation; Bhlhe40-Pou2af1 circuit controlling CXCR5/GC migration; DNA pull-down MS/Co-IP/ChIP with GATA2/3 and CRISPR KO in trophoblast stem cells\",\n      \"pmids\": [\"41359309\", \"41134666\", \"40911186\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether BHLHE40-GATA cooperation generalizes beyond trophoblast unknown\", \"Single-lab validation for each axis\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The central unresolved question is the molecular logic that switches BHLHE40 between direct E-box repression, partner-tethered (SP1/T-bet/GATA) activation or repression, and chromatin-looping architecture in a cell-type-specific manner.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No unified model for context-dependent repressor/activator switching\", \"No high-resolution structures of BHLHE40 with partners on DNA\", \"Determinants of locus selection across tissues not defined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 5, 9, 11, 17, 26, 28]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [9, 12, 13, 16, 42]},\n      {\"term_id\": \"GO:0140097\", \"supporting_discovery_ids\": [11, 8, 18]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [30, 37, 40]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [0, 1, 2, 4, 5, 6, 26, 27]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [9, 11, 17, 26, 28]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [7, 11, 15, 23, 29]},\n      {\"term_id\": \"R-HSA-9909396\", \"supporting_discovery_ids\": [10]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [12, 13, 34]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"TBX21\", \"PGC-1\\u03b1\", \"CEBPB\", \"LXRA\", \"SP1\", \"GATA2\", \"GATA3\", \"MYOD1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}