{"gene":"BHLHE41","run_date":"2026-06-09T22:02:44","timeline":{"discoveries":[{"year":2002,"finding":"DEC2 (BHLHE41) represses Clock/Bmal1-induced transactivation of the Per1 promoter through direct protein-protein interactions with Bmal1 and/or competition for E-box elements, functioning as a negative regulator of the mammalian molecular clock.","method":"Transcription reporter (luciferase) assays and protein-protein interaction studies in cell culture","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal functional assays, replicated across multiple labs in subsequent papers, foundational mechanistic study","pmids":["12397359"],"is_preprint":false},{"year":2001,"finding":"DEC2 (BHLHE41) is a bHLH transcription factor lacking the WRPW motif for Groucho corepressor interaction, contains an Orange domain, and dimerizes via its HLH domain; it was mapped to human chromosome 12p11.23-p12.1.","method":"Molecular cloning, sequence analysis, chromosomal mapping","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — molecular characterization of domain structure, single lab but multiple structural methods","pmids":["11162494"],"is_preprint":false},{"year":2002,"finding":"DEC2 gene transcription is directly induced by HIF-1α through functional hypoxia response elements (HREs) in its promoter that bind HIF-1α and HIF-1β, demonstrating direct transcriptional regulation by hypoxia.","method":"Luciferase reporter assays with HIF-1α, gel mobility shift assays (EMSA) identifying HRE binding","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro EMSA plus reporter assays with mutagenesis, replicated in multiple cell lines","pmids":["12354771"],"is_preprint":false},{"year":2003,"finding":"DEC1 negatively regulates DEC2 expression by binding to an E-box motif in the DEC2 proximal promoter through direct DNA binding; DNA-binding-defective DEC1 mutants lose this repressive activity.","method":"Co-transfection reporter assays, stable transfectants with tetracycline-inducible DEC1, deletion and site-directed mutagenesis of DEC2 promoter","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — luciferase reporter + site-directed mutagenesis + inducible overexpression system, single lab with multiple orthogonal methods","pmids":["12624110"],"is_preprint":false},{"year":2003,"finding":"mSharp-1/DEC2 binds E-box motifs (CANNTG) as a homodimer and represses transcription through: (1) occupancy of E-box sites by homodimers, (2) direct physical interaction with MyoD and E proteins, and (3) interaction with transcriptional activator Sp1 to impair Sp1-induced transcription.","method":"Gel mobility shift assays, chromatin immunoprecipitation (ChIP), co-immunoprecipitation, luciferase reporter assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — multiple orthogonal methods (EMSA, ChIP, Co-IP, reporter assay) in single study establishing distinct mechanisms","pmids":["12657651"],"is_preprint":false},{"year":2004,"finding":"Dec2 gene transcription is regulated by the molecular clock: Clock/Bmal1 and Clock/Bmal2 heterodimers activate Dec2 via two CACGTG E-boxes in its promoter, while Dec2 itself binds these E-boxes to repress its own transcription (negative autoregulatory feedback). Cry and Per also suppress Clock/Bmal-induced Dec2 transcription.","method":"Luciferase reporter assays, gel retardation assays, Clock mutant mouse analysis","journal":"The Biochemical journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro EMSA plus reporter assays plus in vivo Clock mutant mice, replicated across labs","pmids":["15147242"],"is_preprint":false},{"year":2004,"finding":"Sharp-1/DEC2 inhibits skeletal muscle differentiation by interacting with MyoD and E-proteins (E47), reducing their DNA binding and transactivation from MyoD-dependent E-box sites; re-expression of MyoD~E47 rescues the differentiation block, placing myogenic bHLH factors downstream of Sharp-1.","method":"C2C12 myoblast overexpression, co-immunoprecipitation, gene expression analysis, genetic rescue experiment","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — Co-IP demonstrating physical interaction, genetic epistasis rescue, defined phenotypic readout, single lab with multiple methods","pmids":["15448136"],"is_preprint":false},{"year":2004,"finding":"DEC2 suppresses transcription of the cholesterol 7α-hydroxylase gene (CYP7A), CYP8B, and CYP51 in liver by binding to the E-box (CACATG) in the CYP7A promoter, opposing the activating effect of D-site binding protein (DBP).","method":"Transfection reporter assays, electrophoretic mobility shift assays (EMSA)","journal":"Genes to cells","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — EMSA plus reporter assays, single lab, two orthogonal methods","pmids":["15066123"],"is_preprint":false},{"year":2007,"finding":"DEC2 represses transcription through multiple mechanisms at E-box elements: (1) preferential binding to class B E-boxes (CACGTG) as a homodimer, (2) repression via C-terminal domain recruiting HDAC1 in an HDAC-dependent manner, and (3) repression at class A E-boxes (MyoD targets) via heterodimer formation with MyoD through basic and HLH domains in an HDAC-independent manner.","method":"Gel retardation assays, luciferase reporter assays, GAL4 fusion domain analysis, structure-function mutagenesis","journal":"International journal of molecular medicine","confidence":"High","confidence_rationale":"Tier 1 / Moderate — multiple mutagenesis experiments combined with binding and reporter assays defining distinct mechanistic pathways","pmids":["17487425"],"is_preprint":false},{"year":2008,"finding":"DEC2 binds directly to HIF-1α (co-immunoprecipitation) but not ARNT1, and decreases HIF-1α binding to the HRE in the VEGF promoter, thereby suppressing VEGF gene expression under hypoxic conditions.","method":"Co-immunoprecipitation, ChIP assay, luciferase reporter assays, DEC2 knockdown","journal":"Genes to cells","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP plus ChIP plus knockdown with defined functional readout, single lab with multiple orthogonal methods","pmids":["18233956"],"is_preprint":false},{"year":2008,"finding":"DEC2 represses the MLH1 promoter by directly binding to an E-box-like motif in the MLH1 promoter, an effect that is inhibited by the HDAC inhibitor trichostatin A, suggesting histone deacetylase-dependent repression mechanism.","method":"Co-transfection reporter assay, EMSA, ChIP assay, siRNA knockdown","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 1 / Moderate — EMSA plus ChIP plus reporter assay with TSA pharmacological validation, multiple orthogonal methods in single study","pmids":["18345027"],"is_preprint":false},{"year":2008,"finding":"DEC2 inhibits SREBP-1c-induced transcription by competing with SREBP-1c for E-box binding in the SREBP-1c promoter and/or by direct protein-protein interaction with SREBP-1c protein; DEC2 is the major initiator of hypoxic repression of SREBP-1c while DEC1/Stra13 substitutes in prolonged hypoxia.","method":"Reporter assays, Co-IP/protein interaction studies, siRNA knockdown of DEC2 and Stra13","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reporter assay plus protein interaction plus differential siRNA knockdown, single lab","pmids":["18838394"],"is_preprint":false},{"year":2008,"finding":"SHARP1/DEC2 interacts with and inhibits transcriptional activity of both C/EBPβ and C/EBPα, and enhances association of C/EBPβ with HDAC1, leading to retention of HDAC1 and histone methyltransferase G9a at C/EBPα and PPARγ2 promoters and inhibition of adipogenesis.","method":"Protein interaction studies (Co-IP), ChIP assays, overexpression in adipocyte differentiation model, pharmacological rescue with troglitazone","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP, ChIP, and differentiation rescue assay with multiple orthogonal methods in single study","pmids":["19029947"],"is_preprint":false},{"year":2009,"finding":"DEC2 is required for initial TH2 lineage commitment in CD4+ T cells; DEC2 directly binds to and activates transcription of JunB and GATA-3 genes, and GATA-3 in turn induces DEC2 expression creating a feed-forward regulatory circuit.","method":"Dec2-deficient mouse model, in vitro TH2 differentiation assays, asthma model, ChIP/transcriptional activation assays","journal":"Nature immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — knockout mouse plus in vitro differentiation plus direct transcriptional target identification, multiple orthogonal methods","pmids":["19881507"],"is_preprint":false},{"year":2009,"finding":"DEC2 functions as a corepressor of retinoid X receptor (RXRα): DEC2 directly interacts with RXRα (interaction enhanced by ligand), represses ligand-dependent RXRα transactivation, modifies RXRα-cofactor interactions, and an LXXLL motif in DEC2 is necessary for RXRα repression. DEC2 also represses LXR target genes in hepatocytes.","method":"Transfection reporter assays, Co-IP, ChIP assays, siRNA knockdown, DEC2 deletion/point mutants","journal":"Molecular pharmacology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — mutagenesis (LXXLL motif), Co-IP, ChIP, and reporter assays with multiple orthogonal methods in single study","pmids":["19786558"],"is_preprint":false},{"year":2009,"finding":"A human missense mutation in DEC2 (hDEC2-P385R) is associated with familial short sleep phenotype; transgenic mice carrying this mutation showed increased vigilance time and less sleep, establishing DEC2 as a transcriptional repressor regulating sleep length.","method":"Human genetics (family study), transgenic mouse model with EEG/activity recording","journal":"Science","confidence":"High","confidence_rationale":"Tier 2 / Strong — human genetic variant causally linked to phenotype, validated in transgenic mouse model with physiological readout","pmids":["19679812"],"is_preprint":false},{"year":2001,"finding":"SHARP-1 represses transcription via two independent domains: (1) a C-terminal domain that represses via a histone deacetylase (HDAC)-dependent mechanism (sensitive to trichostatin A), and (2) the bHLH domain that represses via an HDAC-independent mechanism. SHARP-1 represses transcription from the M1 muscarinic acetylcholine receptor gene promoter.","method":"GAL4 fusion reporter assays, trichostatin A pharmacological inhibition, overexpression reporter assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — domain mapping with GAL4 fusions plus pharmacological dissection defining two distinct mechanisms, first functional characterization","pmids":["11278948"],"is_preprint":false},{"year":2012,"finding":"SHARP1/DEC2 (BHLHE41) suppresses breast cancer metastasis by directly binding to HIF-1α and HIF-2α and promoting their proteasomal degradation, serving as the HIF-presenting factor to the proteasome. This process is independent of pVHL, hypoxia, and the ubiquitination machinery.","method":"Co-IP demonstrating SHARP1-HIF interaction, proteasomal degradation assays, in vitro migration/invasion assays, in vivo metastasis models, gain- and loss-of-function","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP, biochemical degradation assays, in vitro and in vivo functional studies with multiple orthogonal methods; published in Nature with comprehensive mechanistic characterization","pmids":["22801492"],"is_preprint":false},{"year":2012,"finding":"G9a lysine methyltransferase directly interacts with Sharp-1 and enhances its ability to transcriptionally repress the myogenin promoter; Sharp-1 overexpression leads to G9a-dependent H3K9me2 and MyoD methylation at muscle gene promoters, and G9a inhibition rescues the Sharp-1-imposed differentiation block.","method":"Co-IP demonstrating Sharp-1/G9a interaction, ChIP for H3K9me2, siRNA knockdown, pharmacological inhibition of G9a","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 / Moderate — Co-IP, ChIP, genetic (RNAi), and pharmacological rescue, multiple orthogonal methods in single study","pmids":["23087213"],"is_preprint":false},{"year":2013,"finding":"Sharp-1 associates directly with Smad3 (co-immunoprecipitation), and overexpression of Sharp-1 inhibits TGF-β- and Smad3-mediated expression of extracellular matrix genes in myofibroblasts, placing Sharp-1 as a regulator of TGF-β signaling in muscle regeneration.","method":"Co-IP, in vitro overexpression, knockout mouse model of injury-induced muscle regeneration, decorin treatment rescue","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus in vivo knockout phenotype plus in vitro functional assay, single lab","pmids":["24357723"],"is_preprint":false},{"year":2013,"finding":"Sumoylation of Sharp-1 at two conserved lysine residues (K240 and K255) is required for its full transcriptional repression activity and inhibition of myogenic differentiation; sumoylation acts as a signal for recruitment of the co-repressor G9a and associated H3K9me2 mark at muscle promoters.","method":"SUMO site mutagenesis (K240R, K255R), ChIP for G9a and H3K9me2, SENP1 co-expression, myogenic differentiation assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — site-directed mutagenesis of SUMO acceptor sites combined with ChIP and functional differentiation assays, defining PTM-dependent mechanism","pmids":["23637228"],"is_preprint":false},{"year":2014,"finding":"SENP1 (SUMO-specific protease 1) is a specific de-SUMOylation protease for Sharp-1; SENP1-mediated de-SUMOylation of Sharp-1 releases Sharp-1 repression of PPARγ transcription, thereby promoting adipocyte differentiation.","method":"SENP1 knockout mouse embryonic fibroblasts, de-SUMOylation assays, adipocyte differentiation assays","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — knockout model plus biochemical de-SUMOylation assay, single lab","pmids":["24942744"],"is_preprint":false},{"year":2014,"finding":"DEC2 suppresses prepro-orexin (Hcrt) promoter activity through cis-acting E-box elements; the short-sleep mutant DEC2-P384R has reduced repressor activity and decreased binding affinity to the prepro-orexin promoter due to weakened interaction with other transcription factors, resulting in increased orexin expression.","method":"Cell culture reporter assay, transgenic mouse model, orexin receptor antagonist treatment rescue, promoter binding assays","journal":"Proceedings of the National Academy of Sciences","confidence":"High","confidence_rationale":"Tier 2 / Strong — reporter assays, transgenic mouse model, pharmacological rescue experiment, defining mechanistic link between DEC2 and orexin regulation","pmids":["29531056"],"is_preprint":false},{"year":2014,"finding":"A novel BHLHE41 variant (Y362H) reduces the ability of BHLHE41 to suppress CLOCK/BMAL1 and NPAS2/BMAL1 transactivation in vitro, and is associated with reduced sleep duration and resistance to sleep deprivation; random mutagenesis identified additional variants affecting CLOCK/BMAL1 suppression.","method":"Cell-based luciferase reporter assay for CLOCK/BMAL1 transactivation suppression, sequencing of BHLHE41 gene in sleep-phenotyped cohorts","journal":"Sleep","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro reporter assay functional validation, human genetic study, single lab","pmids":["25083013"],"is_preprint":false},{"year":2015,"finding":"BHLHE41 competes with transcription factor SP1 for DNA binding to regulate TWIST1 gene transcription; BHLHE41 suppresses transcription of EMT effectors SNAI1, SNAI2, and TWIST1 in endometrial cancer cells.","method":"Luciferase reporter assays, promoter deletion analysis, siRNA knockdown, invasion assays","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reporter assays with promoter mapping plus functional competition assay, single lab","pmids":["26391953"],"is_preprint":false},{"year":2014,"finding":"DEC2 represses Twist1 transcription by directly binding to a consensus E-box (CACGTG) in the Twist1 promoter, as demonstrated by site-directed mutagenesis abolishing DEC2 response and ChIP confirming direct binding.","method":"Luciferase reporter assays, site-directed mutagenesis of E-box, ChIP assay, siRNA knockdown","journal":"Biochemical and biophysical research communications","confidence":"High","confidence_rationale":"Tier 1 / Moderate — mutagenesis of target E-box plus ChIP validation, two orthogonal methods confirming direct binding-dependent repression","pmids":["25446074"],"is_preprint":false},{"year":2008,"finding":"Sharp-1/DEC2 is expressed in the suprachiasmatic nucleus and peripheral tissues with circadian oscillation; Sharp-1 and Sharp-2 regulate period length, tissue-specific clock gene expression, and entrainment to external cues in vivo; in a context-specific manner, SHARP-1 can serve dual functions as both repressor and co-activator of mammalian clock gene expression.","method":"Sharp-1 and Sharp-2 single and double mutant mice, circadian behavior recording, light-pulse phase-shifting experiments, jet-lag paradigm","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo genetic knockout models with multiple behavioral and molecular readouts, complementary single and double mutant analysis","pmids":["18648504"],"is_preprint":false},{"year":2010,"finding":"DEC2 (BHLHE41) interacts with HDAC1 (co-immunoprecipitation), and bexarotene treatment causes recruitment of both DEC2 and HDAC1 to the cyclin D1 promoter (ChIP), repressing cyclin D1 transcription; HDAC inhibitor TSA reverses repression, and DEC2 siRNA knockdown abolishes repression.","method":"Co-immunoprecipitation, ChIP, luciferase reporter assay, siRNA knockdown, TSA pharmacological inhibition","journal":"Breast cancer research and treatment","confidence":"High","confidence_rationale":"Tier 2 / Moderate — Co-IP plus ChIP plus pharmacological dissection plus siRNA knockdown, multiple orthogonal methods establishing HDAC1 recruitment mechanism","pmids":["20821348"],"is_preprint":false},{"year":2012,"finding":"RORα activates Dec1 and Dec2 expression through novel ROR response elements (ROREs) identified in the Dec1 and Dec2 promoters, but REVERBα does not repress Dec2 via these elements (unlike its effect on Bmal1), indicating distinct regulation of Dec2 by nuclear receptors.","method":"Luciferase reporter assays, EMSA, ChIP assays for RORα binding to DEC2 promoter","journal":"Genes to cells","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — EMSA plus ChIP plus reporter assay, single lab","pmids":["22244086"],"is_preprint":false},{"year":2015,"finding":"DEC2-E4BP4 form a heterodimer that binds to the EE element (direct repeat of E-box-like sequences) in the Per2 promoter and represses Per2 transcription, identifying this heterodimer as a key repressor of the Per2 feedback loop.","method":"Reporter assays, protein-protein interaction studies, promoter binding assays","journal":"Frontiers in neurology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional reporter assay plus protein interaction demonstrating heterodimer formation and binding, single lab","pmids":["26257703"],"is_preprint":false},{"year":2017,"finding":"Bhlhe41 is essential for B-1a cell development and self-renewal; Bhlhe41 directly represses cell-cycle regulators and inhibitors of BCR signaling while enabling pro-survival cytokine signaling, as determined by Bhlhe41-/- Bhlhe40-/- double knockout mice showing severely reduced B-1a cells with abnormal phenotype and altered BCR repertoire.","method":"Bhlhe41/Bhlhe40 double knockout mouse model, flow cytometry, gene expression analysis, pre-rearranged BCR rescue experiment","journal":"Nature immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic knockout with defined cellular phenotype, epistasis rescue experiment, direct transcriptional target identification","pmids":["28250425"],"is_preprint":false},{"year":2018,"finding":"SHARP1 is an oncogenic driver in MLL-AF6 AML; its expression is directly regulated by MLL-AF6/DOT1L; SHARP1 binds to transcriptionally active chromatin and activates genes critical for cell survival and key oncogenic MLL-AF6 targets; genetic deletion in mice delays leukemia development while sparing normal hematopoiesis.","method":"MLL-AF6 AML cell lines, SHARP1 knockdown/overexpression, ChIP-seq, mouse leukemia model, human AML samples","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP-seq, genetic mouse model, human cell lines, multiple orthogonal methods establishing oncogenic mechanism","pmids":["29692408"],"is_preprint":false},{"year":2019,"finding":"Bhlhe40 and Bhlhe41 are required for alveolar macrophage self-renewal and identity; genome-wide characterization of Bhlhe40 DNA binding showed direct repression of lineage-inappropriate genes in alveolar macrophages; knockout cells showed decreased proliferation and downregulation of AM signature genes.","method":"Bhlhe40/Bhlhe41 knockout mice, competitive bone marrow transplantation, ChIP-seq, RNA-seq","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — genome-wide ChIP-seq plus RNA-seq plus competitive knockout transplantation, multiple orthogonal methods","pmids":["31414712"],"is_preprint":false},{"year":2019,"finding":"Dec2 directly represses Sohlh1 (a spermatogonial differentiation factor) transcription in neonatal germ cells; Dec2 deficiency in mice reduces undifferentiated spermatogonia and impairs spermatogonial stem cell engraftment efficiency.","method":"Single-cell RNA-seq, Dec2 knockout mice, spermatogonial transplantation assay","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic knockout model plus transplantation assay plus scRNA-seq, single lab","pmids":["30988352"],"is_preprint":false},{"year":2020,"finding":"BHLHE40 and BHLHE41 act in negative feedback opposition to TFEB; genes counter-regulated by TFEB and BHLHE40/41 were identified, with BHLHE40/41 protecting cells from lysosomal cell death when TFEB drives their expression.","method":"Genome-wide CRISPR library screen, transcriptional response assays, lysosomal cell death assays","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genome-wide CRISPR screen plus functional validation, single lab","pmids":["33176151"],"is_preprint":false},{"year":2022,"finding":"METTL3 promotes BHLHE41 expression in an m6A-dependent manner (epitranscriptomic regulation); BHLHE41 subsequently induces CXCL1 transcription to enhance MDSC migration; BHLHE41 depletion abolishes the METTL3-driven MDSC migration effect, establishing the m6A-BHLHE41-CXCL1/CXCR2 axis.","method":"m6A sequencing, RNA sequencing, cytokine arrays, BHLHE41 siRNA depletion, CXCR2 inhibitor treatment, syngeneic mouse models, CD34+ humanized mice","journal":"Gastroenterology","confidence":"High","confidence_rationale":"Tier 2 / Strong — m6A-seq plus RNA-seq plus genetic depletion plus pharmacological inhibition plus multiple in vivo models, multi-method study","pmids":["35700773"],"is_preprint":false},{"year":2022,"finding":"In the CIC-PER2-BHLHE41 axis regulating B-1a cell development, CIC suppresses postnatal B-1a cells by repressing Per2; CIC deficiency mediates Per2 derepression which inhibits CRY-mediated transcriptional repression of Bhlhe41, thereby upregulating Bhlhe41 levels and promoting B-1a cell formation.","method":"B-cell-specific Cic-null mice, BCR signaling analysis, genetic pathway analysis","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic mouse models establishing epistatic pathway, single lab","pmids":["35172136"],"is_preprint":false},{"year":2013,"finding":"GLI1/GLI2 activate BHLHE41/DEC2/SHARP1 expression through a GLI-binding site in its promoter; activated BHLHE41 then suppresses MLH1 expression in pancreatic cancer cells, establishing a GLI1-BHLHE41-MLH1 pathway that impairs DNA mismatch repair.","method":"GLI1 target gene screening, promoter reporter assays with GLI-binding site, double knockdown of GLI1/GLI2, TALEN-based MLH1 gene modification, immunohistochemistry","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — promoter reporter assay plus double knockdown plus in vivo tissue validation, single lab","pmids":["24165159"],"is_preprint":false},{"year":2018,"finding":"HDAC4 regulates Sharp1 expression in satellite cells; HDAC4 conditional knockout leads to upregulation of Sharp1 (and P21), which blocks satellite cell differentiation. Reducing Sharp1 expression in HDAC4 KO satellite cells rescues the differentiation block, placing Sharp1 downstream of HDAC4.","method":"Tamoxifen-inducible conditional HDAC4 knockout in Pax7+ cells, RNA-sequencing, shRNA-mediated Sharp1 reduction rescue experiment","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic knockout plus RNA-seq plus rescue epistasis, single lab","pmids":["29472596"],"is_preprint":false},{"year":2014,"finding":"SHARP1 physically interacts with HIF-1α in endometrial cancer cells; SHARP1 overexpression decreases HIF-1α protein levels and reduces expression of HIF-1α target genes (VEGFA, ANGPTL4, CA9) under hypoxia, suppressing hypoxia-induced angiogenesis.","method":"Co-immunoprecipitation, western blotting, siRNA knockdown, in vivo xenograft model","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus functional knockdown plus in vivo model, single lab","pmids":["24918449"],"is_preprint":false},{"year":2014,"finding":"Insulin induces SHARP-1 gene expression at the transcriptional level via both PI3-K/aPKCλ/JNK and PI3-K/Rac/JNK signaling pathways; new protein synthesis is required for induction; and overexpressed SHARP-1 specifically represses PEPCK promoter activity.","method":"Pharmacological inhibitors (LY294002, wortmannin, staurosporine), dominant-negative aPKCλ and Rac1 overexpression, actinomycin D and cycloheximide treatment, promoter-reporter assays","journal":"Hormone and metabolic research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple pharmacological inhibitors plus dominant-negative constructs plus reporter assay, single lab","pmids":["24446161"],"is_preprint":false}],"current_model":"BHLHE41 (DEC2/SHARP1) is a bHLH transcription factor that represses target gene expression through multiple mechanisms: direct E-box (CACGTG) binding as a homodimer, competitive displacement of activating bHLH factors (CLOCK/BMAL1, MyoD), direct protein-protein interactions with transcription factors (HIF-1α, HIF-2α, Bmal1, MyoD, E47, C/EBPs, RXRα, Smad3, SP1), and recruitment of co-repressors (HDAC1, G9a methyltransferase) in a manner regulated by SUMOylation; it functions as a core negative regulator of the circadian clock, promotes HIF protein proteasomal degradation to suppress hypoxia-driven metastasis, regulates sleep length (with loss-of-function mutations causing short sleep via increased orexin expression), controls immune cell lineage commitment (TH2 cells, B-1a cells, alveolar macrophages), and inhibits skeletal muscle and adipocyte differentiation, while being itself regulated by CLOCK/BMAL1 via E-boxes, HIF-1α via HREs, RORα via ROREs, and m6A modification by METTL3."},"narrative":{"mechanistic_narrative":"BHLHE41 (DEC2/SHARP1) is a basic helix-loop-helix transcriptional repressor that integrates circadian, hypoxic, and differentiation signals to control gene expression across diverse cell lineages [PMID:12397359, PMID:17487425, PMID:22801492]. It binds class B E-boxes (CACGTG) as a homodimer and represses transcription through two separable routes: a C-terminal domain that recruits HDAC1 in an HDAC-dependent manner and the bHLH domain that represses HDAC-independently, in part by heterodimerizing with and inactivating partner factors such as MyoD and E47 [PMID:12657651, PMID:17487425, PMID:11278948]. Beyond direct DNA occupancy, it suppresses targets by competing for E-box or SP1 sites and by direct protein-protein interaction with activating factors including CLOCK/BMAL1, HIF-1α/HIF-2α, C/EBPα/β, RXRα, SREBP-1c, SP1, and Smad3 [PMID:12397359, PMID:18838394, PMID:19029947, PMID:19786558, PMID:22801492, PMID:26391953], frequently coupled to recruitment of co-repressors HDAC1 and the methyltransferase G9a, the latter deposited at target promoters in a manner gated by SUMOylation of two conserved lysines and reversed by SENP1 [PMID:23087213, PMID:23637228, PMID:24942744, PMID:20821348]. As a core clock component it is induced by CLOCK/BMAL1 and RORα through E-boxes and ROREs and feeds back to repress its own and Per promoters, regulating circadian period and sleep length—a human P385R mutation causes familial short sleep, acting through derepression of prepro-orexin [PMID:15147242, PMID:19679812, PMID:29531056, PMID:22244086]. It promotes proteasomal degradation of HIF-1α/HIF-2α independently of pVHL to suppress hypoxia-driven angiogenesis and breast cancer metastasis [PMID:18233956, PMID:22801492, PMID:24918449]. Functionally, it blocks skeletal muscle and adipocyte differentiation [PMID:15448136, PMID:19029947], and is required for TH2 commitment, B-1a cell development, and alveolar macrophage self-renewal and identity [PMID:19881507, PMID:28250425, PMID:31414712].","teleology":[{"year":2001,"claim":"Establishing BHLHE41's domain architecture and intrinsic repressor activity defined how it acts mechanistically distinct from WRPW-containing bHLH factors.","evidence":"Molecular cloning, sequence analysis and GAL4 fusion reporter dissection with TSA inhibition","pmids":["11162494","11278948"],"confidence":"High","gaps":["No structural model of the HLH or Orange domains","Identity of the C-terminal HDAC-recruiting surface not mapped at residue level"]},{"year":2002,"claim":"Showing BHLHE41 represses CLOCK/BMAL1-driven Per1 transactivation placed it as a negative arm of the molecular clock and raised whether it acts by competition or protein binding.","evidence":"Luciferase reporter assays and protein interaction studies in cell culture","pmids":["12397359"],"confidence":"High","gaps":["Relative contribution of E-box competition vs Bmal1 binding not resolved","No in vivo clock phenotype in this study"]},{"year":2002,"claim":"Demonstrating direct HIF-1α induction of BHLHE41 via HREs connected hypoxia signaling to this repressor's expression.","evidence":"Luciferase reporters with HIF-1α and EMSA of HRE binding","pmids":["12354771"],"confidence":"High","gaps":["Did not address BHLHE41's reciprocal effect on HIF"]},{"year":2003,"claim":"Defining E-box homodimer binding plus direct MyoD/E-protein and SP1 interactions established multiple parallel repression mechanisms, and reciprocal DEC1-DEC2 cross-regulation revealed an interlocking repressor network.","evidence":"EMSA, ChIP, Co-IP, reporter assays and inducible DEC1 overexpression","pmids":["12657651","12624110"],"confidence":"High","gaps":["Stoichiometry of homodimer vs heterodimer occupancy at endogenous loci unknown"]},{"year":2004,"claim":"Identifying CLOCK/BMAL1 and CLOCK/BMAL2 activation of Dec2 through E-boxes plus Dec2 autorepression closed a negative-feedback loop, and parallel work extended the repressor to muscle and lipid-metabolic targets.","evidence":"Reporter and gel-retardation assays, Clock mutant mice, C2C12 myoblast Co-IP and rescue, hepatic CYP7A reporter/EMSA","pmids":["15147242","15448136","15066123"],"confidence":"High","gaps":["In vivo significance of CYP7A repression not tested in animals","Whether autoregulation operates at all peripheral clocks unknown"]},{"year":2007,"claim":"Domain-resolved dissection separated HDAC1-dependent repression at class B E-boxes from HDAC-independent MyoD-heterodimer repression at class A E-boxes, clarifying two mechanistic modes.","evidence":"Gel retardation, GAL4 fusion analysis and structure-function mutagenesis","pmids":["17487425"],"confidence":"High","gaps":["Cofactors recruited in the HDAC-independent mode not fully defined"]},{"year":2008,"claim":"BHLHE41 was shown to interact directly with HIF-1α and inhibit its DNA binding, and to repress additional targets (MLH1, SREBP-1c) via E-box binding and HDAC-dependent mechanisms, broadening its regulatory reach.","evidence":"Co-IP, ChIP, EMSA, reporter assays and siRNA in multiple cell systems","pmids":["18233956","18345027","18838394"],"confidence":"High","gaps":["Whether HIF inhibition was via DNA-binding competition or protein degradation not yet distinguished (resolved 2012)"]},{"year":2008,"claim":"Genetic mouse models established BHLHE41 as a bona fide in vivo clock regulator controlling period and entrainment, with context-dependent dual repressor/coactivator behavior.","evidence":"Single and double Sharp-1/Sharp-2 mutant mice with circadian behavior and phase-shift assays","pmids":["18648504"],"confidence":"High","gaps":["Molecular basis of coactivator function unexplained"]},{"year":2009,"claim":"BHLHE41 was placed as a node controlling lineage differentiation and nuclear-receptor signaling, acting as an RXRα corepressor and a positive regulator of TH2 commitment.","evidence":"Dec2-deficient mice, TH2 differentiation and asthma models, ChIP, LXXLL-motif mutagenesis, Co-IP","pmids":["19881507","19786558"],"confidence":"High","gaps":["Direct vs indirect activation of JunB/GATA-3 in vivo not fully separated"]},{"year":2009,"claim":"A human DEC2 missense mutation causally linked to short sleep, validated in transgenic mice, established the gene's role in sleep-length regulation.","evidence":"Family genetics and transgenic mouse EEG/activity recording","pmids":["19679812"],"confidence":"High","gaps":["Downstream effector of the sleep phenotype not identified in this study (later orexin)"]},{"year":2010,"claim":"Direct HDAC1 recruitment to the cyclin D1 promoter upon bexarotene treatment defined a co-repressor recruitment mechanism for cell-cycle control.","evidence":"Co-IP, ChIP, reporter assays, siRNA and TSA inhibition","pmids":["20821348"],"confidence":"High","gaps":["Generality of HDAC1 recruitment across other targets not established here"]},{"year":2012,"claim":"BHLHE41 was shown to drive proteasomal degradation of HIF-1α/HIF-2α independent of pVHL and ubiquitination, recasting it as a metastasis suppressor and a HIF-presenting factor.","evidence":"Co-IP, proteasomal degradation assays, in vitro invasion and in vivo metastasis models with gain/loss of function","pmids":["22801492"],"confidence":"High","gaps":["Biochemical mechanism of ubiquitin-independent proteasome targeting unresolved","Structural basis of HIF presentation unknown"]},{"year":2012,"claim":"Identification of G9a as a direct partner depositing H3K9me2 and methylating MyoD established a chromatin-modifying axis for the muscle-differentiation block, and RORα was defined as a distinct nuclear-receptor activator of Dec2.","evidence":"Co-IP, ChIP for H3K9me2, siRNA, G9a inhibition; EMSA/ChIP/reporter for RORα","pmids":["23087213","22244086"],"confidence":"High","gaps":["Whether G9a recruitment generalizes beyond muscle loci not tested in this study"]},{"year":2013,"claim":"SUMOylation at K240/K255 was shown to gate co-repressor G9a recruitment and full repressor activity, defining a post-translational switch controlling BHLHE41 function.","evidence":"SUMO site mutagenesis, ChIP for G9a and H3K9me2, SENP1 co-expression and differentiation assays","pmids":["23637228"],"confidence":"High","gaps":["E3 SUMO ligase for BHLHE41 not identified","Stimulus controlling SUMOylation dynamics unknown"]},{"year":2013,"claim":"BHLHE41 was linked to additional signaling and cancer pathways via Smad3 interaction and a GLI-driven repression of MLH1, expanding its regulatory and disease relevance.","evidence":"Co-IP and muscle-regeneration knockout model; GLI target screening, promoter reporters, double knockdown, TALEN editing","pmids":["24357723","24165159"],"confidence":"Medium","gaps":["Smad3 interaction supported by single-lab Co-IP","Direct vs indirect MLH1 repression via GLI axis not fully separated"]},{"year":2014,"claim":"Mechanistic links between SUMO/SENP1 regulation and adipogenesis, hypoxia signaling, EMT, sleep, and metabolic induction were consolidated, including the orexin effector of short sleep and insulin-driven SHARP-1 induction.","evidence":"SENP1-KO MEFs, Co-IP/ChIP, transgenic mice with orexin-antagonist rescue, reporter assays, pharmacological/dominant-negative dissection of insulin signaling","pmids":["24942744","39","29531056","25083013","25446074","24446161"],"confidence":"Medium","gaps":["Several mechanisms rest on single-lab evidence","Tissue-specificity of insulin-induced PEPCK repression not validated in vivo"]},{"year":2017,"claim":"Genetic models established BHLHE41 (with paralog BHLHE40) as essential for B-1a cell development and self-renewal through repression of cell-cycle and BCR-signaling inhibitors.","evidence":"Bhlhe41/Bhlhe40 double knockout mice, flow cytometry, expression profiling and BCR rescue","pmids":["28250425"],"confidence":"High","gaps":["Direct DNA-binding map in B-1a cells not generated here"]},{"year":2018,"claim":"BHLHE41 was identified as a context-dependent oncogenic driver in MLL-AF6 AML where it binds active chromatin and activates survival genes, contrasting with its canonical repressor role.","evidence":"ChIP-seq, knockdown/overexpression, mouse leukemia model and human AML samples; HDAC4-Sharp1 satellite cell axis by KO/RNA-seq/rescue","pmids":["29692408","29472596"],"confidence":"High","gaps":["Molecular determinant of activator vs repressor mode unknown","Cofactors enabling gene activation in AML not defined"]},{"year":2019,"claim":"Genome-wide DNA-binding and knockout studies established BHLHE40/41-mediated repression of lineage-inappropriate genes in alveolar macrophages and direct repression of Sohlh1 in germ cells, extending its identity-control role across tissues.","evidence":"Knockout mice, competitive transplantation, ChIP-seq, RNA-seq; scRNA-seq and spermatogonial transplantation","pmids":["31414712","30988352"],"confidence":"High","gaps":["Direct BHLHE41 (vs BHLHE40) binding contribution in macrophages not separately resolved","Germ-cell findings single-lab"]},{"year":2020,"claim":"Functional genomics positioned BHLHE40/41 in negative-feedback opposition to TFEB, protecting cells from lysosomal cell death.","evidence":"Genome-wide CRISPR screen and lysosomal death assays","pmids":["33176151"],"confidence":"Medium","gaps":["Direct vs indirect counter-regulation of TFEB targets not dissected","Single-lab screen"]},{"year":2022,"claim":"Epitranscriptomic control by METTL3 (m6A) and an upstream CIC-PER2 circuit were shown to set BHLHE41 levels, coupling it to MDSC migration via CXCL1 and to B-1a development.","evidence":"m6A-seq, RNA-seq, cytokine arrays, depletion/inhibitor experiments, syngeneic and humanized mice; B-cell-specific Cic-null mice","pmids":["35700773","35172136"],"confidence":"Medium","gaps":["Whether CXCL1 is a direct BHLHE41 target not fully established","CIC-PER2 axis single-lab epistasis"]},{"year":null,"claim":"The structural and biochemical basis for BHLHE41's switch between transcriptional repressor and activator, and for its ubiquitin-independent presentation of HIF to the proteasome, remains unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No experimental structure of BHLHE41 or its complexes","Mechanism distinguishing repressor vs activator chromatin states unknown","Biochemical reconstitution of HIF degradation not achieved"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[4,5,8,10,25]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,4,8,16,13,31]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,9,14,17,12]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[4,8,31]}],"pathway":[{"term_id":"R-HSA-9909396","term_label":"Circadian clock","supporting_discovery_ids":[0,5,26,29]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[4,8,13]},{"term_id":"R-HSA-8953897","term_label":"Cellular responses to stimuli","supporting_discovery_ids":[2,9,17]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[6,12,13,30,32]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[13,30,32]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[17,24,31,35]},{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[18,20,27]}],"complexes":[],"partners":["BMAL1","HIF1A","MYOD","E47","CEBPB","RXRA","G9A","HDAC1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9C0J9","full_name":"Class E basic helix-loop-helix protein 41","aliases":["Class B basic helix-loop-helix protein 3","bHLHb3","Differentially expressed in chondrocytes protein 2","hDEC2","Enhancer-of-split and hairy-related protein 1","SHARP-1"],"length_aa":482,"mass_kda":50.5,"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:11278948, PubMed:14672706, PubMed:15193144, PubMed:15560782, PubMed:18411297, PubMed:19786558, PubMed:25083013). 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). Both these loops are interlocked as it represses the expression of PER1 and in turn is repressed by PER1/2 and CRY1/2. Represses the activity of the circadian transcriptional activator: CLOCK-BMAL1 heterodimer by competing for the binding to E-box elements (5'-CACGTG-3') found within the promoters of its target genes (PubMed:25083013). Negatively regulates its own expression and the expression of DBP and BHLHE41/DEC2. Acts as a corepressor of RXR and the RXR-LXR heterodimers and represses the ligand-induced RXRA/B/G, NR1H3/LXRA, NR1H4 and VDR transactivation activity. Inhibits HNF1A-mediated transactivation of CYP1A2, CYP2E1 AND CYP3A11 (By similarity)","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/Q9C0J9/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/BHLHE41","classification":"Not Classified","n_dependent_lines":26,"n_total_lines":1208,"dependency_fraction":0.02152317880794702},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/BHLHE41","total_profiled":1310},"omim":[{"mim_id":"612975","title":"SHORT SLEEP, FAMILIAL NATURAL, 1; FNSS1","url":"https://www.omim.org/entry/612975"},{"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"},{"mim_id":"114480","title":"BREAST CANCER","url":"https://www.omim.org/entry/114480"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"},{"location":"Vesicles","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"retina","ntpm":113.5},{"tissue":"skeletal muscle","ntpm":86.6}],"url":"https://www.proteinatlas.org/search/BHLHE41"},"hgnc":{"alias_symbol":["DEC2","SHARP-1","SHARP1"],"prev_symbol":["BHLHB3"]},"alphafold":{"accession":"Q9C0J9","domains":[{"cath_id":"4.10.280","chopping":"45-119","consensus_level":"medium","plddt":89.1343,"start":45,"end":119},{"cath_id":"1.10.287","chopping":"122-174","consensus_level":"medium","plddt":83.923,"start":122,"end":174}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9C0J9","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9C0J9-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9C0J9-F1-predicted_aligned_error_v6.png","plddt_mean":55.09},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=BHLHE41","jax_strain_url":"https://www.jax.org/strain/search?query=BHLHE41"},"sequence":{"accession":"Q9C0J9","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9C0J9.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9C0J9/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9C0J9"}},"corpus_meta":[{"pmid":"12397359","id":"PMC_12397359","title":"Dec1 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immunology","url":"https://pubmed.ncbi.nlm.nih.gov/28250425","citation_count":92,"is_preprint":false},{"pmid":"11162494","id":"PMC_11162494","title":"Molecular cloning and characterization of DEC2, a new member of basic helix-loop-helix proteins.","date":"2001","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/11162494","citation_count":91,"is_preprint":false},{"pmid":"25083013","id":"PMC_25083013","title":"A novel BHLHE41 variant is associated with short sleep and resistance to sleep deprivation in humans.","date":"2014","source":"Sleep","url":"https://pubmed.ncbi.nlm.nih.gov/25083013","citation_count":90,"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 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molecular & cellular mechanisms","url":"https://pubmed.ncbi.nlm.nih.gov/20236182","citation_count":62,"is_preprint":false},{"pmid":"29531056","id":"PMC_29531056","title":"DEC2 modulates orexin expression and regulates sleep.","date":"2018","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/29531056","citation_count":60,"is_preprint":false},{"pmid":"15066123","id":"PMC_15066123","title":"Rhythmic expression of DEC1 and DEC2 in peripheral tissues: DEC2 is a potent suppressor for hepatic cytochrome P450s opposing DBP.","date":"2004","source":"Genes to cells : devoted to molecular & cellular mechanisms","url":"https://pubmed.ncbi.nlm.nih.gov/15066123","citation_count":59,"is_preprint":false},{"pmid":"18838394","id":"PMC_18838394","title":"Stra13/DEC1 and DEC2 inhibit sterol regulatory element binding protein-1c in a hypoxia-inducible factor-dependent mechanism.","date":"2008","source":"Nucleic acids 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helix-loop-helix protein, sharp-1, represses transcription by a histone deacetylase-dependent and histone deacetylase-independent mechanism.","date":"2001","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/11278948","citation_count":33,"is_preprint":false},{"pmid":"22572381","id":"PMC_22572381","title":"BHLH transcription factor DEC2 regulates pro-apoptotic factor Bim in human oral cancer HSC-3 cells.","date":"2012","source":"Biomedical research (Tokyo, Japan)","url":"https://pubmed.ncbi.nlm.nih.gov/22572381","citation_count":31,"is_preprint":false},{"pmid":"25340473","id":"PMC_25340473","title":"Mice lacking the circadian modulators SHARP1 and SHARP2 display altered sleep and mixed state endophenotypes of psychiatric disorders.","date":"2014","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/25340473","citation_count":30,"is_preprint":false},{"pmid":"26710124","id":"PMC_26710124","title":"Differentially Expressed in Chondrocytes 2 (DEC2) 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cells.","date":"2019","source":"Oncotarget","url":"https://pubmed.ncbi.nlm.nih.gov/31384392","citation_count":10,"is_preprint":false},{"pmid":"30250985","id":"PMC_30250985","title":"Contribution of the clock gene DEC2 to VEGF mRNA upregulation by modulation of HIF1α protein levels in hypoxic MIO-M1 cells, a human cell line of retinal glial (Müller) cells.","date":"2018","source":"Japanese journal of ophthalmology","url":"https://pubmed.ncbi.nlm.nih.gov/30250985","citation_count":10,"is_preprint":false},{"pmid":"21129405","id":"PMC_21129405","title":"Basic-helix-loop-helix transcription factor DEC2 constitutes negative feedback loop in IFN-β-mediated inflammatory responses in human mesangial cells.","date":"2010","source":"Immunology letters","url":"https://pubmed.ncbi.nlm.nih.gov/21129405","citation_count":10,"is_preprint":false},{"pmid":"39254779","id":"PMC_39254779","title":"BHLHE41, a transcriptional repressor involved in physiological processes and tumor 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culture\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal functional assays, replicated across multiple labs in subsequent papers, foundational mechanistic study\",\n      \"pmids\": [\"12397359\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"DEC2 (BHLHE41) is a bHLH transcription factor lacking the WRPW motif for Groucho corepressor interaction, contains an Orange domain, and dimerizes via its HLH domain; it was mapped to human chromosome 12p11.23-p12.1.\",\n      \"method\": \"Molecular cloning, sequence analysis, chromosomal mapping\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — molecular characterization of domain structure, single lab but multiple structural methods\",\n      \"pmids\": [\"11162494\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"DEC2 gene transcription is directly induced by HIF-1α through functional hypoxia response elements (HREs) in its promoter that bind HIF-1α and HIF-1β, demonstrating direct transcriptional regulation by hypoxia.\",\n      \"method\": \"Luciferase reporter assays with HIF-1α, gel mobility shift assays (EMSA) identifying HRE binding\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro EMSA plus reporter assays with mutagenesis, replicated in multiple cell lines\",\n      \"pmids\": [\"12354771\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"DEC1 negatively regulates DEC2 expression by binding to an E-box motif in the DEC2 proximal promoter through direct DNA binding; DNA-binding-defective DEC1 mutants lose this repressive activity.\",\n      \"method\": \"Co-transfection reporter assays, stable transfectants with tetracycline-inducible DEC1, deletion and site-directed mutagenesis of DEC2 promoter\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — luciferase reporter + site-directed mutagenesis + inducible overexpression system, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"12624110\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"mSharp-1/DEC2 binds E-box motifs (CANNTG) as a homodimer and represses transcription through: (1) occupancy of E-box sites by homodimers, (2) direct physical interaction with MyoD and E proteins, and (3) interaction with transcriptional activator Sp1 to impair Sp1-induced transcription.\",\n      \"method\": \"Gel mobility shift assays, chromatin immunoprecipitation (ChIP), co-immunoprecipitation, luciferase reporter assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — multiple orthogonal methods (EMSA, ChIP, Co-IP, reporter assay) in single study establishing distinct mechanisms\",\n      \"pmids\": [\"12657651\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Dec2 gene transcription is regulated by the molecular clock: Clock/Bmal1 and Clock/Bmal2 heterodimers activate Dec2 via two CACGTG E-boxes in its promoter, while Dec2 itself binds these E-boxes to repress its own transcription (negative autoregulatory feedback). Cry and Per also suppress Clock/Bmal-induced Dec2 transcription.\",\n      \"method\": \"Luciferase reporter assays, gel retardation assays, Clock mutant mouse analysis\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro EMSA plus reporter assays plus in vivo Clock mutant mice, replicated across labs\",\n      \"pmids\": [\"15147242\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Sharp-1/DEC2 inhibits skeletal muscle differentiation by interacting with MyoD and E-proteins (E47), reducing their DNA binding and transactivation from MyoD-dependent E-box sites; re-expression of MyoD~E47 rescues the differentiation block, placing myogenic bHLH factors downstream of Sharp-1.\",\n      \"method\": \"C2C12 myoblast overexpression, co-immunoprecipitation, gene expression analysis, genetic rescue experiment\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP demonstrating physical interaction, genetic epistasis rescue, defined phenotypic readout, single lab with multiple methods\",\n      \"pmids\": [\"15448136\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"DEC2 suppresses transcription of the cholesterol 7α-hydroxylase gene (CYP7A), CYP8B, and CYP51 in liver by binding to the E-box (CACATG) in the CYP7A promoter, opposing the activating effect of D-site binding protein (DBP).\",\n      \"method\": \"Transfection reporter assays, electrophoretic mobility shift assays (EMSA)\",\n      \"journal\": \"Genes to cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — EMSA plus reporter assays, single lab, two orthogonal methods\",\n      \"pmids\": [\"15066123\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"DEC2 represses transcription through multiple mechanisms at E-box elements: (1) preferential binding to class B E-boxes (CACGTG) as a homodimer, (2) repression via C-terminal domain recruiting HDAC1 in an HDAC-dependent manner, and (3) repression at class A E-boxes (MyoD targets) via heterodimer formation with MyoD through basic and HLH domains in an HDAC-independent manner.\",\n      \"method\": \"Gel retardation assays, luciferase reporter assays, GAL4 fusion domain analysis, structure-function mutagenesis\",\n      \"journal\": \"International journal of molecular medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — multiple mutagenesis experiments combined with binding and reporter assays defining distinct mechanistic pathways\",\n      \"pmids\": [\"17487425\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"DEC2 binds directly to HIF-1α (co-immunoprecipitation) but not ARNT1, and decreases HIF-1α binding to the HRE in the VEGF promoter, thereby suppressing VEGF gene expression under hypoxic conditions.\",\n      \"method\": \"Co-immunoprecipitation, ChIP assay, luciferase reporter assays, DEC2 knockdown\",\n      \"journal\": \"Genes to cells\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP plus ChIP plus knockdown with defined functional readout, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"18233956\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"DEC2 represses the MLH1 promoter by directly binding to an E-box-like motif in the MLH1 promoter, an effect that is inhibited by the HDAC inhibitor trichostatin A, suggesting histone deacetylase-dependent repression mechanism.\",\n      \"method\": \"Co-transfection reporter assay, EMSA, ChIP assay, siRNA knockdown\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — EMSA plus ChIP plus reporter assay with TSA pharmacological validation, multiple orthogonal methods in single study\",\n      \"pmids\": [\"18345027\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"DEC2 inhibits SREBP-1c-induced transcription by competing with SREBP-1c for E-box binding in the SREBP-1c promoter and/or by direct protein-protein interaction with SREBP-1c protein; DEC2 is the major initiator of hypoxic repression of SREBP-1c while DEC1/Stra13 substitutes in prolonged hypoxia.\",\n      \"method\": \"Reporter assays, Co-IP/protein interaction studies, siRNA knockdown of DEC2 and Stra13\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reporter assay plus protein interaction plus differential siRNA knockdown, single lab\",\n      \"pmids\": [\"18838394\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"SHARP1/DEC2 interacts with and inhibits transcriptional activity of both C/EBPβ and C/EBPα, and enhances association of C/EBPβ with HDAC1, leading to retention of HDAC1 and histone methyltransferase G9a at C/EBPα and PPARγ2 promoters and inhibition of adipogenesis.\",\n      \"method\": \"Protein interaction studies (Co-IP), ChIP assays, overexpression in adipocyte differentiation model, pharmacological rescue with troglitazone\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP, ChIP, and differentiation rescue assay with multiple orthogonal methods in single study\",\n      \"pmids\": [\"19029947\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"DEC2 is required for initial TH2 lineage commitment in CD4+ T cells; DEC2 directly binds to and activates transcription of JunB and GATA-3 genes, and GATA-3 in turn induces DEC2 expression creating a feed-forward regulatory circuit.\",\n      \"method\": \"Dec2-deficient mouse model, in vitro TH2 differentiation assays, asthma model, ChIP/transcriptional activation assays\",\n      \"journal\": \"Nature immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — knockout mouse plus in vitro differentiation plus direct transcriptional target identification, multiple orthogonal methods\",\n      \"pmids\": [\"19881507\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"DEC2 functions as a corepressor of retinoid X receptor (RXRα): DEC2 directly interacts with RXRα (interaction enhanced by ligand), represses ligand-dependent RXRα transactivation, modifies RXRα-cofactor interactions, and an LXXLL motif in DEC2 is necessary for RXRα repression. DEC2 also represses LXR target genes in hepatocytes.\",\n      \"method\": \"Transfection reporter assays, Co-IP, ChIP assays, siRNA knockdown, DEC2 deletion/point mutants\",\n      \"journal\": \"Molecular pharmacology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — mutagenesis (LXXLL motif), Co-IP, ChIP, and reporter assays with multiple orthogonal methods in single study\",\n      \"pmids\": [\"19786558\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"A human missense mutation in DEC2 (hDEC2-P385R) is associated with familial short sleep phenotype; transgenic mice carrying this mutation showed increased vigilance time and less sleep, establishing DEC2 as a transcriptional repressor regulating sleep length.\",\n      \"method\": \"Human genetics (family study), transgenic mouse model with EEG/activity recording\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — human genetic variant causally linked to phenotype, validated in transgenic mouse model with physiological readout\",\n      \"pmids\": [\"19679812\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"SHARP-1 represses transcription via two independent domains: (1) a C-terminal domain that represses via a histone deacetylase (HDAC)-dependent mechanism (sensitive to trichostatin A), and (2) the bHLH domain that represses via an HDAC-independent mechanism. SHARP-1 represses transcription from the M1 muscarinic acetylcholine receptor gene promoter.\",\n      \"method\": \"GAL4 fusion reporter assays, trichostatin A pharmacological inhibition, overexpression reporter assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — domain mapping with GAL4 fusions plus pharmacological dissection defining two distinct mechanisms, first functional characterization\",\n      \"pmids\": [\"11278948\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"SHARP1/DEC2 (BHLHE41) suppresses breast cancer metastasis by directly binding to HIF-1α and HIF-2α and promoting their proteasomal degradation, serving as the HIF-presenting factor to the proteasome. This process is independent of pVHL, hypoxia, and the ubiquitination machinery.\",\n      \"method\": \"Co-IP demonstrating SHARP1-HIF interaction, proteasomal degradation assays, in vitro migration/invasion assays, in vivo metastasis models, gain- and loss-of-function\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP, biochemical degradation assays, in vitro and in vivo functional studies with multiple orthogonal methods; published in Nature with comprehensive mechanistic characterization\",\n      \"pmids\": [\"22801492\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"G9a lysine methyltransferase directly interacts with Sharp-1 and enhances its ability to transcriptionally repress the myogenin promoter; Sharp-1 overexpression leads to G9a-dependent H3K9me2 and MyoD methylation at muscle gene promoters, and G9a inhibition rescues the Sharp-1-imposed differentiation block.\",\n      \"method\": \"Co-IP demonstrating Sharp-1/G9a interaction, ChIP for H3K9me2, siRNA knockdown, pharmacological inhibition of G9a\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, ChIP, genetic (RNAi), and pharmacological rescue, multiple orthogonal methods in single study\",\n      \"pmids\": [\"23087213\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Sharp-1 associates directly with Smad3 (co-immunoprecipitation), and overexpression of Sharp-1 inhibits TGF-β- and Smad3-mediated expression of extracellular matrix genes in myofibroblasts, placing Sharp-1 as a regulator of TGF-β signaling in muscle regeneration.\",\n      \"method\": \"Co-IP, in vitro overexpression, knockout mouse model of injury-induced muscle regeneration, decorin treatment rescue\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus in vivo knockout phenotype plus in vitro functional assay, single lab\",\n      \"pmids\": [\"24357723\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Sumoylation of Sharp-1 at two conserved lysine residues (K240 and K255) is required for its full transcriptional repression activity and inhibition of myogenic differentiation; sumoylation acts as a signal for recruitment of the co-repressor G9a and associated H3K9me2 mark at muscle promoters.\",\n      \"method\": \"SUMO site mutagenesis (K240R, K255R), ChIP for G9a and H3K9me2, SENP1 co-expression, myogenic differentiation assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — site-directed mutagenesis of SUMO acceptor sites combined with ChIP and functional differentiation assays, defining PTM-dependent mechanism\",\n      \"pmids\": [\"23637228\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"SENP1 (SUMO-specific protease 1) is a specific de-SUMOylation protease for Sharp-1; SENP1-mediated de-SUMOylation of Sharp-1 releases Sharp-1 repression of PPARγ transcription, thereby promoting adipocyte differentiation.\",\n      \"method\": \"SENP1 knockout mouse embryonic fibroblasts, de-SUMOylation assays, adipocyte differentiation assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — knockout model plus biochemical de-SUMOylation assay, single lab\",\n      \"pmids\": [\"24942744\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"DEC2 suppresses prepro-orexin (Hcrt) promoter activity through cis-acting E-box elements; the short-sleep mutant DEC2-P384R has reduced repressor activity and decreased binding affinity to the prepro-orexin promoter due to weakened interaction with other transcription factors, resulting in increased orexin expression.\",\n      \"method\": \"Cell culture reporter assay, transgenic mouse model, orexin receptor antagonist treatment rescue, promoter binding assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reporter assays, transgenic mouse model, pharmacological rescue experiment, defining mechanistic link between DEC2 and orexin regulation\",\n      \"pmids\": [\"29531056\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"A novel BHLHE41 variant (Y362H) reduces the ability of BHLHE41 to suppress CLOCK/BMAL1 and NPAS2/BMAL1 transactivation in vitro, and is associated with reduced sleep duration and resistance to sleep deprivation; random mutagenesis identified additional variants affecting CLOCK/BMAL1 suppression.\",\n      \"method\": \"Cell-based luciferase reporter assay for CLOCK/BMAL1 transactivation suppression, sequencing of BHLHE41 gene in sleep-phenotyped cohorts\",\n      \"journal\": \"Sleep\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro reporter assay functional validation, human genetic study, single lab\",\n      \"pmids\": [\"25083013\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"BHLHE41 competes with transcription factor SP1 for DNA binding to regulate TWIST1 gene transcription; BHLHE41 suppresses transcription of EMT effectors SNAI1, SNAI2, and TWIST1 in endometrial cancer cells.\",\n      \"method\": \"Luciferase reporter assays, promoter deletion analysis, siRNA knockdown, invasion assays\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reporter assays with promoter mapping plus functional competition assay, single lab\",\n      \"pmids\": [\"26391953\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"DEC2 represses Twist1 transcription by directly binding to a consensus E-box (CACGTG) in the Twist1 promoter, as demonstrated by site-directed mutagenesis abolishing DEC2 response and ChIP confirming direct binding.\",\n      \"method\": \"Luciferase reporter assays, site-directed mutagenesis of E-box, ChIP assay, siRNA knockdown\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — mutagenesis of target E-box plus ChIP validation, two orthogonal methods confirming direct binding-dependent repression\",\n      \"pmids\": [\"25446074\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Sharp-1/DEC2 is expressed in the suprachiasmatic nucleus and peripheral tissues with circadian oscillation; Sharp-1 and Sharp-2 regulate period length, tissue-specific clock gene expression, and entrainment to external cues in vivo; in a context-specific manner, SHARP-1 can serve dual functions as both repressor and co-activator of mammalian clock gene expression.\",\n      \"method\": \"Sharp-1 and Sharp-2 single and double mutant mice, circadian behavior recording, light-pulse phase-shifting experiments, jet-lag paradigm\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo genetic knockout models with multiple behavioral and molecular readouts, complementary single and double mutant analysis\",\n      \"pmids\": [\"18648504\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"DEC2 (BHLHE41) interacts with HDAC1 (co-immunoprecipitation), and bexarotene treatment causes recruitment of both DEC2 and HDAC1 to the cyclin D1 promoter (ChIP), repressing cyclin D1 transcription; HDAC inhibitor TSA reverses repression, and DEC2 siRNA knockdown abolishes repression.\",\n      \"method\": \"Co-immunoprecipitation, ChIP, luciferase reporter assay, siRNA knockdown, TSA pharmacological inhibition\",\n      \"journal\": \"Breast cancer research and treatment\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus ChIP plus pharmacological dissection plus siRNA knockdown, multiple orthogonal methods establishing HDAC1 recruitment mechanism\",\n      \"pmids\": [\"20821348\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"RORα activates Dec1 and Dec2 expression through novel ROR response elements (ROREs) identified in the Dec1 and Dec2 promoters, but REVERBα does not repress Dec2 via these elements (unlike its effect on Bmal1), indicating distinct regulation of Dec2 by nuclear receptors.\",\n      \"method\": \"Luciferase reporter assays, EMSA, ChIP assays for RORα binding to DEC2 promoter\",\n      \"journal\": \"Genes to cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — EMSA plus ChIP plus reporter assay, single lab\",\n      \"pmids\": [\"22244086\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"DEC2-E4BP4 form a heterodimer that binds to the EE element (direct repeat of E-box-like sequences) in the Per2 promoter and represses Per2 transcription, identifying this heterodimer as a key repressor of the Per2 feedback loop.\",\n      \"method\": \"Reporter assays, protein-protein interaction studies, promoter binding assays\",\n      \"journal\": \"Frontiers in neurology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional reporter assay plus protein interaction demonstrating heterodimer formation and binding, single lab\",\n      \"pmids\": [\"26257703\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Bhlhe41 is essential for B-1a cell development and self-renewal; Bhlhe41 directly represses cell-cycle regulators and inhibitors of BCR signaling while enabling pro-survival cytokine signaling, as determined by Bhlhe41-/- Bhlhe40-/- double knockout mice showing severely reduced B-1a cells with abnormal phenotype and altered BCR repertoire.\",\n      \"method\": \"Bhlhe41/Bhlhe40 double knockout mouse model, flow cytometry, gene expression analysis, pre-rearranged BCR rescue experiment\",\n      \"journal\": \"Nature immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic knockout with defined cellular phenotype, epistasis rescue experiment, direct transcriptional target identification\",\n      \"pmids\": [\"28250425\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"SHARP1 is an oncogenic driver in MLL-AF6 AML; its expression is directly regulated by MLL-AF6/DOT1L; SHARP1 binds to transcriptionally active chromatin and activates genes critical for cell survival and key oncogenic MLL-AF6 targets; genetic deletion in mice delays leukemia development while sparing normal hematopoiesis.\",\n      \"method\": \"MLL-AF6 AML cell lines, SHARP1 knockdown/overexpression, ChIP-seq, mouse leukemia model, human AML samples\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP-seq, genetic mouse model, human cell lines, multiple orthogonal methods establishing oncogenic mechanism\",\n      \"pmids\": [\"29692408\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Bhlhe40 and Bhlhe41 are required for alveolar macrophage self-renewal and identity; genome-wide characterization of Bhlhe40 DNA binding showed direct repression of lineage-inappropriate genes in alveolar macrophages; knockout cells showed decreased proliferation and downregulation of AM signature genes.\",\n      \"method\": \"Bhlhe40/Bhlhe41 knockout mice, competitive bone marrow transplantation, ChIP-seq, RNA-seq\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genome-wide ChIP-seq plus RNA-seq plus competitive knockout transplantation, multiple orthogonal methods\",\n      \"pmids\": [\"31414712\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Dec2 directly represses Sohlh1 (a spermatogonial differentiation factor) transcription in neonatal germ cells; Dec2 deficiency in mice reduces undifferentiated spermatogonia and impairs spermatogonial stem cell engraftment efficiency.\",\n      \"method\": \"Single-cell RNA-seq, Dec2 knockout mice, spermatogonial transplantation assay\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knockout model plus transplantation assay plus scRNA-seq, single lab\",\n      \"pmids\": [\"30988352\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"BHLHE40 and BHLHE41 act in negative feedback opposition to TFEB; genes counter-regulated by TFEB and BHLHE40/41 were identified, with BHLHE40/41 protecting cells from lysosomal cell death when TFEB drives their expression.\",\n      \"method\": \"Genome-wide CRISPR library screen, transcriptional response assays, lysosomal cell death assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genome-wide CRISPR screen plus functional validation, single lab\",\n      \"pmids\": [\"33176151\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"METTL3 promotes BHLHE41 expression in an m6A-dependent manner (epitranscriptomic regulation); BHLHE41 subsequently induces CXCL1 transcription to enhance MDSC migration; BHLHE41 depletion abolishes the METTL3-driven MDSC migration effect, establishing the m6A-BHLHE41-CXCL1/CXCR2 axis.\",\n      \"method\": \"m6A sequencing, RNA sequencing, cytokine arrays, BHLHE41 siRNA depletion, CXCR2 inhibitor treatment, syngeneic mouse models, CD34+ humanized mice\",\n      \"journal\": \"Gastroenterology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — m6A-seq plus RNA-seq plus genetic depletion plus pharmacological inhibition plus multiple in vivo models, multi-method study\",\n      \"pmids\": [\"35700773\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"In the CIC-PER2-BHLHE41 axis regulating B-1a cell development, CIC suppresses postnatal B-1a cells by repressing Per2; CIC deficiency mediates Per2 derepression which inhibits CRY-mediated transcriptional repression of Bhlhe41, thereby upregulating Bhlhe41 levels and promoting B-1a cell formation.\",\n      \"method\": \"B-cell-specific Cic-null mice, BCR signaling analysis, genetic pathway analysis\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic mouse models establishing epistatic pathway, single lab\",\n      \"pmids\": [\"35172136\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"GLI1/GLI2 activate BHLHE41/DEC2/SHARP1 expression through a GLI-binding site in its promoter; activated BHLHE41 then suppresses MLH1 expression in pancreatic cancer cells, establishing a GLI1-BHLHE41-MLH1 pathway that impairs DNA mismatch repair.\",\n      \"method\": \"GLI1 target gene screening, promoter reporter assays with GLI-binding site, double knockdown of GLI1/GLI2, TALEN-based MLH1 gene modification, immunohistochemistry\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — promoter reporter assay plus double knockdown plus in vivo tissue validation, single lab\",\n      \"pmids\": [\"24165159\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"HDAC4 regulates Sharp1 expression in satellite cells; HDAC4 conditional knockout leads to upregulation of Sharp1 (and P21), which blocks satellite cell differentiation. Reducing Sharp1 expression in HDAC4 KO satellite cells rescues the differentiation block, placing Sharp1 downstream of HDAC4.\",\n      \"method\": \"Tamoxifen-inducible conditional HDAC4 knockout in Pax7+ cells, RNA-sequencing, shRNA-mediated Sharp1 reduction rescue experiment\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knockout plus RNA-seq plus rescue epistasis, single lab\",\n      \"pmids\": [\"29472596\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"SHARP1 physically interacts with HIF-1α in endometrial cancer cells; SHARP1 overexpression decreases HIF-1α protein levels and reduces expression of HIF-1α target genes (VEGFA, ANGPTL4, CA9) under hypoxia, suppressing hypoxia-induced angiogenesis.\",\n      \"method\": \"Co-immunoprecipitation, western blotting, siRNA knockdown, in vivo xenograft model\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus functional knockdown plus in vivo model, single lab\",\n      \"pmids\": [\"24918449\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Insulin induces SHARP-1 gene expression at the transcriptional level via both PI3-K/aPKCλ/JNK and PI3-K/Rac/JNK signaling pathways; new protein synthesis is required for induction; and overexpressed SHARP-1 specifically represses PEPCK promoter activity.\",\n      \"method\": \"Pharmacological inhibitors (LY294002, wortmannin, staurosporine), dominant-negative aPKCλ and Rac1 overexpression, actinomycin D and cycloheximide treatment, promoter-reporter assays\",\n      \"journal\": \"Hormone and metabolic research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple pharmacological inhibitors plus dominant-negative constructs plus reporter assay, single lab\",\n      \"pmids\": [\"24446161\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"BHLHE41 (DEC2/SHARP1) is a bHLH transcription factor that represses target gene expression through multiple mechanisms: direct E-box (CACGTG) binding as a homodimer, competitive displacement of activating bHLH factors (CLOCK/BMAL1, MyoD), direct protein-protein interactions with transcription factors (HIF-1α, HIF-2α, Bmal1, MyoD, E47, C/EBPs, RXRα, Smad3, SP1), and recruitment of co-repressors (HDAC1, G9a methyltransferase) in a manner regulated by SUMOylation; it functions as a core negative regulator of the circadian clock, promotes HIF protein proteasomal degradation to suppress hypoxia-driven metastasis, regulates sleep length (with loss-of-function mutations causing short sleep via increased orexin expression), controls immune cell lineage commitment (TH2 cells, B-1a cells, alveolar macrophages), and inhibits skeletal muscle and adipocyte differentiation, while being itself regulated by CLOCK/BMAL1 via E-boxes, HIF-1α via HREs, RORα via ROREs, and m6A modification by METTL3.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"BHLHE41 (DEC2/SHARP1) is a basic helix-loop-helix transcriptional repressor that integrates circadian, hypoxic, and differentiation signals to control gene expression across diverse cell lineages [#0, #8, #17]. It binds class B E-boxes (CACGTG) as a homodimer and represses transcription through two separable routes: a C-terminal domain that recruits HDAC1 in an HDAC-dependent manner and the bHLH domain that represses HDAC-independently, in part by heterodimerizing with and inactivating partner factors such as MyoD and E47 [#4, #8, #16]. Beyond direct DNA occupancy, it suppresses targets by competing for E-box or SP1 sites and by direct protein-protein interaction with activating factors including CLOCK/BMAL1, HIF-1\\u03b1/HIF-2\\u03b1, C/EBP\\u03b1/\\u03b2, RXR\\u03b1, SREBP-1c, SP1, and Smad3 [#0, #11, #12, #14, #17, #24], frequently coupled to recruitment of co-repressors HDAC1 and the methyltransferase G9a, the latter deposited at target promoters in a manner gated by SUMOylation of two conserved lysines and reversed by SENP1 [#18, #20, #21, #27]. As a core clock component it is induced by CLOCK/BMAL1 and ROR\\u03b1 through E-boxes and ROREs and feeds back to repress its own and Per promoters, regulating circadian period and sleep length\\u2014a human P385R mutation causes familial short sleep, acting through derepression of prepro-orexin [#5, #15, #22, #28]. It promotes proteasomal degradation of HIF-1\\u03b1/HIF-2\\u03b1 independently of pVHL to suppress hypoxia-driven angiogenesis and breast cancer metastasis [#9, #17, #39]. Functionally, it blocks skeletal muscle and adipocyte differentiation [#6, #12], and is required for TH2 commitment, B-1a cell development, and alveolar macrophage self-renewal and identity [#13, #30, #32].\",\n  \"teleology\": [\n    {\n      \"year\": 2001,\n      \"claim\": \"Establishing BHLHE41's domain architecture and intrinsic repressor activity defined how it acts mechanistically distinct from WRPW-containing bHLH factors.\",\n      \"evidence\": \"Molecular cloning, sequence analysis and GAL4 fusion reporter dissection with TSA inhibition\",\n      \"pmids\": [\"11162494\", \"11278948\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structural model of the HLH or Orange domains\", \"Identity of the C-terminal HDAC-recruiting surface not mapped at residue level\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Showing BHLHE41 represses CLOCK/BMAL1-driven Per1 transactivation placed it as a negative arm of the molecular clock and raised whether it acts by competition or protein binding.\",\n      \"evidence\": \"Luciferase reporter assays and protein interaction studies in cell culture\",\n      \"pmids\": [\"12397359\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative contribution of E-box competition vs Bmal1 binding not resolved\", \"No in vivo clock phenotype in this study\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Demonstrating direct HIF-1\\u03b1 induction of BHLHE41 via HREs connected hypoxia signaling to this repressor's expression.\",\n      \"evidence\": \"Luciferase reporters with HIF-1\\u03b1 and EMSA of HRE binding\",\n      \"pmids\": [\"12354771\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not address BHLHE41's reciprocal effect on HIF\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Defining E-box homodimer binding plus direct MyoD/E-protein and SP1 interactions established multiple parallel repression mechanisms, and reciprocal DEC1-DEC2 cross-regulation revealed an interlocking repressor network.\",\n      \"evidence\": \"EMSA, ChIP, Co-IP, reporter assays and inducible DEC1 overexpression\",\n      \"pmids\": [\"12657651\", \"12624110\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry of homodimer vs heterodimer occupancy at endogenous loci unknown\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Identifying CLOCK/BMAL1 and CLOCK/BMAL2 activation of Dec2 through E-boxes plus Dec2 autorepression closed a negative-feedback loop, and parallel work extended the repressor to muscle and lipid-metabolic targets.\",\n      \"evidence\": \"Reporter and gel-retardation assays, Clock mutant mice, C2C12 myoblast Co-IP and rescue, hepatic CYP7A reporter/EMSA\",\n      \"pmids\": [\"15147242\", \"15448136\", \"15066123\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo significance of CYP7A repression not tested in animals\", \"Whether autoregulation operates at all peripheral clocks unknown\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Domain-resolved dissection separated HDAC1-dependent repression at class B E-boxes from HDAC-independent MyoD-heterodimer repression at class A E-boxes, clarifying two mechanistic modes.\",\n      \"evidence\": \"Gel retardation, GAL4 fusion analysis and structure-function mutagenesis\",\n      \"pmids\": [\"17487425\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cofactors recruited in the HDAC-independent mode not fully defined\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"BHLHE41 was shown to interact directly with HIF-1\\u03b1 and inhibit its DNA binding, and to repress additional targets (MLH1, SREBP-1c) via E-box binding and HDAC-dependent mechanisms, broadening its regulatory reach.\",\n      \"evidence\": \"Co-IP, ChIP, EMSA, reporter assays and siRNA in multiple cell systems\",\n      \"pmids\": [\"18233956\", \"18345027\", \"18838394\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether HIF inhibition was via DNA-binding competition or protein degradation not yet distinguished (resolved 2012)\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Genetic mouse models established BHLHE41 as a bona fide in vivo clock regulator controlling period and entrainment, with context-dependent dual repressor/coactivator behavior.\",\n      \"evidence\": \"Single and double Sharp-1/Sharp-2 mutant mice with circadian behavior and phase-shift assays\",\n      \"pmids\": [\"18648504\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of coactivator function unexplained\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"BHLHE41 was placed as a node controlling lineage differentiation and nuclear-receptor signaling, acting as an RXR\\u03b1 corepressor and a positive regulator of TH2 commitment.\",\n      \"evidence\": \"Dec2-deficient mice, TH2 differentiation and asthma models, ChIP, LXXLL-motif mutagenesis, Co-IP\",\n      \"pmids\": [\"19881507\", \"19786558\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct vs indirect activation of JunB/GATA-3 in vivo not fully separated\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"A human DEC2 missense mutation causally linked to short sleep, validated in transgenic mice, established the gene's role in sleep-length regulation.\",\n      \"evidence\": \"Family genetics and transgenic mouse EEG/activity recording\",\n      \"pmids\": [\"19679812\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream effector of the sleep phenotype not identified in this study (later orexin)\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Direct HDAC1 recruitment to the cyclin D1 promoter upon bexarotene treatment defined a co-repressor recruitment mechanism for cell-cycle control.\",\n      \"evidence\": \"Co-IP, ChIP, reporter assays, siRNA and TSA inhibition\",\n      \"pmids\": [\"20821348\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Generality of HDAC1 recruitment across other targets not established here\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"BHLHE41 was shown to drive proteasomal degradation of HIF-1\\u03b1/HIF-2\\u03b1 independent of pVHL and ubiquitination, recasting it as a metastasis suppressor and a HIF-presenting factor.\",\n      \"evidence\": \"Co-IP, proteasomal degradation assays, in vitro invasion and in vivo metastasis models with gain/loss of function\",\n      \"pmids\": [\"22801492\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Biochemical mechanism of ubiquitin-independent proteasome targeting unresolved\", \"Structural basis of HIF presentation unknown\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Identification of G9a as a direct partner depositing H3K9me2 and methylating MyoD established a chromatin-modifying axis for the muscle-differentiation block, and ROR\\u03b1 was defined as a distinct nuclear-receptor activator of Dec2.\",\n      \"evidence\": \"Co-IP, ChIP for H3K9me2, siRNA, G9a inhibition; EMSA/ChIP/reporter for ROR\\u03b1\",\n      \"pmids\": [\"23087213\", \"22244086\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether G9a recruitment generalizes beyond muscle loci not tested in this study\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"SUMOylation at K240/K255 was shown to gate co-repressor G9a recruitment and full repressor activity, defining a post-translational switch controlling BHLHE41 function.\",\n      \"evidence\": \"SUMO site mutagenesis, ChIP for G9a and H3K9me2, SENP1 co-expression and differentiation assays\",\n      \"pmids\": [\"23637228\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"E3 SUMO ligase for BHLHE41 not identified\", \"Stimulus controlling SUMOylation dynamics unknown\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"BHLHE41 was linked to additional signaling and cancer pathways via Smad3 interaction and a GLI-driven repression of MLH1, expanding its regulatory and disease relevance.\",\n      \"evidence\": \"Co-IP and muscle-regeneration knockout model; GLI target screening, promoter reporters, double knockdown, TALEN editing\",\n      \"pmids\": [\"24357723\", \"24165159\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Smad3 interaction supported by single-lab Co-IP\", \"Direct vs indirect MLH1 repression via GLI axis not fully separated\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Mechanistic links between SUMO/SENP1 regulation and adipogenesis, hypoxia signaling, EMT, sleep, and metabolic induction were consolidated, including the orexin effector of short sleep and insulin-driven SHARP-1 induction.\",\n      \"evidence\": \"SENP1-KO MEFs, Co-IP/ChIP, transgenic mice with orexin-antagonist rescue, reporter assays, pharmacological/dominant-negative dissection of insulin signaling\",\n      \"pmids\": [\"24942744\", \"39\", \"29531056\", \"25083013\", \"25446074\", \"24446161\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Several mechanisms rest on single-lab evidence\", \"Tissue-specificity of insulin-induced PEPCK repression not validated in vivo\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Genetic models established BHLHE41 (with paralog BHLHE40) as essential for B-1a cell development and self-renewal through repression of cell-cycle and BCR-signaling inhibitors.\",\n      \"evidence\": \"Bhlhe41/Bhlhe40 double knockout mice, flow cytometry, expression profiling and BCR rescue\",\n      \"pmids\": [\"28250425\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct DNA-binding map in B-1a cells not generated here\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"BHLHE41 was identified as a context-dependent oncogenic driver in MLL-AF6 AML where it binds active chromatin and activates survival genes, contrasting with its canonical repressor role.\",\n      \"evidence\": \"ChIP-seq, knockdown/overexpression, mouse leukemia model and human AML samples; HDAC4-Sharp1 satellite cell axis by KO/RNA-seq/rescue\",\n      \"pmids\": [\"29692408\", \"29472596\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular determinant of activator vs repressor mode unknown\", \"Cofactors enabling gene activation in AML not defined\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Genome-wide DNA-binding and knockout studies established BHLHE40/41-mediated repression of lineage-inappropriate genes in alveolar macrophages and direct repression of Sohlh1 in germ cells, extending its identity-control role across tissues.\",\n      \"evidence\": \"Knockout mice, competitive transplantation, ChIP-seq, RNA-seq; scRNA-seq and spermatogonial transplantation\",\n      \"pmids\": [\"31414712\", \"30988352\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct BHLHE41 (vs BHLHE40) binding contribution in macrophages not separately resolved\", \"Germ-cell findings single-lab\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Functional genomics positioned BHLHE40/41 in negative-feedback opposition to TFEB, protecting cells from lysosomal cell death.\",\n      \"evidence\": \"Genome-wide CRISPR screen and lysosomal death assays\",\n      \"pmids\": [\"33176151\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct vs indirect counter-regulation of TFEB targets not dissected\", \"Single-lab screen\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Epitranscriptomic control by METTL3 (m6A) and an upstream CIC-PER2 circuit were shown to set BHLHE41 levels, coupling it to MDSC migration via CXCL1 and to B-1a development.\",\n      \"evidence\": \"m6A-seq, RNA-seq, cytokine arrays, depletion/inhibitor experiments, syngeneic and humanized mice; B-cell-specific Cic-null mice\",\n      \"pmids\": [\"35700773\", \"35172136\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether CXCL1 is a direct BHLHE41 target not fully established\", \"CIC-PER2 axis single-lab epistasis\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The structural and biochemical basis for BHLHE41's switch between transcriptional repressor and activator, and for its ubiquitin-independent presentation of HIF to the proteasome, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No experimental structure of BHLHE41 or its complexes\", \"Mechanism distinguishing repressor vs activator chromatin states unknown\", \"Biochemical reconstitution of HIF degradation not achieved\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [4, 5, 8, 10, 25]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 4, 8, 16, 13, 31]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 9, 14, 17, 12]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [4, 8, 31]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-9909396\", \"supporting_discovery_ids\": [0, 5, 26, 29]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [4, 8, 13]},\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [2, 9, 17]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [6, 12, 13, 30, 32]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [13, 30, 32]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [17, 24, 31, 35]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [18, 20, 27]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"BMAL1\", \"HIF1A\", \"MyoD\", \"E47\", \"CEBPB\", \"RXRA\", \"G9a\", \"HDAC1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"tie","faith_supported":6,"faith_total":6,"faith_pct":100.0}}