{"gene":"HES6","run_date":"2026-06-10T01:55:22","timeline":{"discoveries":[{"year":2000,"finding":"HES6 alone does not bind DNA but suppresses HES1-mediated transcriptional repression; it also suppresses HES1 from inhibiting MASH1-E47 heterodimer activity, thereby enabling MASH1/E47 to upregulate transcription in the presence of HES1. Loop-region swap mutagenesis showed the loop determines HES1- vs HES6-specific functions.","method":"Transcriptional reporter assays, retroviral misexpression in developing retina, site-directed mutagenesis of loop region","journal":"Development","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — multiple orthogonal methods (DNA-binding assays, reporter assays, mutagenesis, in vivo retroviral misexpression), replicated by independent lab in same year (PMID:10976052)","pmids":["10851137"],"is_preprint":false},{"year":2000,"finding":"HES6 expression is induced by proneural bHLH proteins (neurogenins) but not by the Notch pathway; ectopic HES6 expression in Xenopus embryos promotes neurogenesis, placing HES6 in a positive-feedback loop with proneural factors downstream of neurogenins.","method":"Xenopus ectopic expression, in situ hybridization, epistasis analysis","journal":"Development","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo gain-of-function in Xenopus with pathway placement, replicated across labs","pmids":["10976052"],"is_preprint":false},{"year":2003,"finding":"HES6 antagonizes HES1 by two mechanisms: (1) it inhibits the interaction of HES1 with its transcriptional co-repressor GRO/TLE, and (2) it promotes proteolytic degradation of HES1. Both effects require the WRPW motif and are reduced when the conserved CK2 phosphorylation site Ser183 is mutated.","method":"Co-immunoprecipitation, reporter assays in cortical neural progenitors, site-directed mutagenesis (Ser183), Western blot (protein stability)","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — multiple orthogonal methods (Co-IP, reporter assay, mutagenesis, protein stability) in one rigorous study","pmids":["12972610"],"is_preprint":false},{"year":2001,"finding":"HES6 interacts with the transcriptional co-repressor TLE1 (Groucho) via its WRPW C-terminal motif, represses transcription from N-box-containing templates, and cooperates with HES1 for maximal N-box repression. HES6 expression induces myotube differentiation by repressing MyoR, a repressor of myogenesis.","method":"Yeast two-hybrid and mammalian Co-IP (HES6-TLE1 interaction), reporter assays, GAL4-tethering assay, dominant-negative (ΔWRPW) HES6, myosin heavy chain and MyoR expression analysis","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — yeast two-hybrid plus mammalian Co-IP, reporter assay, dominant-negative rescue, multiple orthogonal methods","pmids":["11551980"],"is_preprint":false},{"year":2002,"finding":"HES6 binds DNA at the Enhancer of Split E-box (ESE) motif (preferred binding site of Drosophila EoS proteins) and represses ESE-box reporter transcription. Overexpression in C2C12 myoblasts impairs terminal differentiation (decreased p21 induction, increased re-entry into cell cycle). Protein-protein interactions rather than DNA binding are required for the myogenic phenotype in Xenopus.","method":"Electrophoretic mobility shift assay (EMSA), reporter assay, C2C12 overexpression, Xenopus microinjection, HES6 domain mutant analysis","journal":"Development","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — EMSA establishes direct DNA binding, in vitro and in vivo phenotypic rescue with domain mutants","pmids":["11959828"],"is_preprint":false},{"year":2005,"finding":"The WRPW motif of HES6 acts as a proteasomal degradation signal: WRPW-deletion mutant protein is substantially stabilized due to resistance to proteasomal degradation. Fusion of WRPW to GFP or GAL4-DBD significantly destabilizes these heterologous proteins.","method":"Western blot (protein stability after proteasome inhibition), WRPW-deletion and fusion constructs in cell lines","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean deletion/fusion mutagenesis with proteasome inhibitor controls, single lab","pmids":["15896295"],"is_preprint":false},{"year":2005,"finding":"In chick, hes6-2 represses transcription of hes5 genes (downstream Notch effectors), forming a negative regulatory circuit: hes5 can repress hes6, and hes6 can repress hes5, providing cyclic regulation of Notch signaling during neurogenesis.","method":"In situ hybridization, gain-of-function electroporation in chick neural tube, epistasis analysis","journal":"Developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo gain-of-function with epistasis, single lab","pmids":["15893982"],"is_preprint":false},{"year":2006,"finding":"Knockdown of endogenous HES6 in cortical progenitors causes supernumerary cells to adopt an astrocytic fate (GFAP+), while HES6 overexpression inhibits astrocyte differentiation. The anti-astrogenic activity requires nuclear localization and the LNHLL and WRPW peptide motifs but is independent of DNA binding via the basic arm of the bHLH domain.","method":"siRNA knockdown, retroviral overexpression, domain deletion/mutation analysis, immunostaining (GFAP), cortical progenitor cultures","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal loss- and gain-of-function with domain mutagenesis, multiple orthogonal methods","pmids":["17065448"],"is_preprint":false},{"year":2007,"finding":"HES6 preferentially forms homodimers; a conserved N-terminal patch of negatively charged residues antagonizes heterodimerization with HES1. Mutation of this motif enhances HES1 heterodimerization and Hes1 suppression but paradoxically decreases anti-astrogenic activity. A C-terminal SPXXSP motif is phosphorylated by the MAPK pathway and its mutation disrupts anti-astrogenic activity without affecting HES1 suppression, indicating that HES6 homodimer-dependent MAPK phosphorylation governs astrocyte inhibition.","method":"Co-IP (dimerization), site-directed mutagenesis (N-terminal patch, SPXXSP), reporter assays, cortical progenitor differentiation assays","journal":"Journal of neurochemistry","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — mutagenesis combined with Co-IP and functional assays, multiple orthogonal approaches in one study","pmids":["17868320"],"is_preprint":false},{"year":2007,"finding":"In Xenopus, HES6 is required for FGF-mediated induction of XmyoD expression; the WRPW domain (Groucho-binding) is essential for this activity. HES6 binds Groucho family members Xgrg2 and Xgrg4, relieving their repression of XmyoD expression.","method":"Morpholino knockdown in Xenopus, co-immunoprecipitation (HES6-Xgrg2/4 interaction), domain mutant rescue experiments","journal":"Developmental biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — morpholino loss-of-function with Co-IP and domain mutant rescue, multiple orthogonal methods","pmids":["17950722"],"is_preprint":false},{"year":2007,"finding":"HES6 localizes to promyelocytic leukemia nuclear bodies (PML-NB) and directly interacts with CREB-binding protein (CBP) via its basic domain. This HES6-CBP complex induces p21 CDK inhibitor expression through chromatin remodeling and p53 acetylation, inhibiting cell proliferation.","method":"Co-IP (HES6-CBP), immunofluorescence (PML-NB localization), reporter assays, p53 acetylation (Western blot), p21 induction assays","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with domain mapping plus functional assays, single lab","pmids":["18160400"],"is_preprint":false},{"year":2011,"finding":"In Xenopus, HES6 depletion by morpholino antisense prevents neural differentiation. Rescue requires WRPW motif (Groucho/TLE binding) but not DNA binding, and HES6 acts through at least two mechanisms: inhibiting anti-neurogenic Hairy proteins and interacting with Groucho/TLE family proteins.","method":"Morpholino antisense knockdown in Xenopus, domain mutant rescue (DNA-binding mutant, WRPW mutant)","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo morpholino with domain mutant rescue, single lab","pmids":["22114720"],"is_preprint":false},{"year":2011,"finding":"HES6 is a direct transcriptional target of MyoD and Myf5 in C2C12 myoblasts. During differentiation, HES6 protein relocates to the nucleus. HES6 siRNA knockdown does not affect cell cycle exit or myosin heavy chain induction but disrupts F-actin filament formation, reduces cell motility, and impairs myoblast fusion.","method":"ChIP (MyoD/Myf5 binding to Hes6 promoter), siRNA knockdown, immunofluorescence (nuclear localization), F-actin staining, cell motility assays, siRNA-resistant rescue construct","journal":"Experimental cell research","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP for direct target validation, siRNA with rescue, multiple orthogonal functional readouts","pmids":["21501606"],"is_preprint":false},{"year":2012,"finding":"In the zebrafish segmentation clock, HES6 serves as a dimerization hub: Her1, Her12, Her15, and Her7 all dimerize with HES6. Her7 sequestration of HES6 reduces HES6 availability for other heterodimers, thereby modulating network topology. Dimers that include HES6 have distinct DNA-binding preferences for cis-regulatory sequences.","method":"In vitro dimerization assays, in vivo genetic experiments (zebrafish), electrophoretic mobility shift assay (DNA-binding specificity), computational network analysis","journal":"Development","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — in vitro reconstitution assays plus in vivo genetic validation plus EMSA, multiple orthogonal approaches","pmids":["22278920"],"is_preprint":false},{"year":2012,"finding":"HES6 overexpression in rhabdomyosarcoma (ARMSp) cells enhances proliferation and cell motility; knockdown reduces both. HES6 regulates motility via upregulation of Transgelin (TAGLN), an actin cytoskeleton regulator; TAGLN knockdown phenocopies HES6 knockdown motility defect and TAGLN overexpression rescues HES6-knockdown motility loss.","method":"siRNA knockdown, mouse Hes6 rescue (siRNA-resistant), expression microarray, TAGLN knockdown/overexpression, cell motility assays","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA with rescue plus epistasis through TAGLN, single lab","pmids":["22982728"],"is_preprint":false},{"year":2014,"finding":"HES6 enhances androgen receptor (AR) transcriptional activity in prostate cancer cells and redirects AR preferentially to a regulatory network enriched for E2F1 transcription factor targets, driving castration-resistant tumor growth in the absence of ligand.","method":"ChIP-seq (AR and HES6 genome-wide binding), gene expression profiling, lentiviral overexpression, xenograft tumor growth assays","journal":"EMBO molecular medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP-seq with in vivo xenograft validation and gene network analysis, multiple orthogonal methods","pmids":["24737870"],"is_preprint":false},{"year":2015,"finding":"SUMO modification of HES6 occurs at lysines 27 and 30. Sumoylation destabilizes HES6 protein (by promoting ubiquitination and proteasomal degradation) and is required for its ~2-hour oscillatory expression rhythm. Sumoylation of HES6 also derepresses HES1-induced transcriptional repression.","method":"Co-transfection and immunoprecipitation (sumo/ubiquitin), Western blot (protein stability), site-directed mutagenesis (K27R/K30R and SUMO protease SUSP1), live-cell imaging of GFP-HES6 oscillations","journal":"Endocrinology and metabolism","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mutagenesis plus Co-IP plus oscillation imaging, single lab","pmids":["26435136"],"is_preprint":false},{"year":2009,"finding":"HES6 overexpression in T47D breast cancer cells stimulates proliferation in vitro and tumor growth in xenografts; it induces E2F1 expression, and HES6 siRNA knockdown downregulates E2F1. Estrogen (17β-estradiol) treatment induces HES6 expression in MCF-7 cells, which subsequently induces hASH-1 and E2F1.","method":"Lentiviral stable overexpression, siRNA knockdown, xenograft tumor growth assay, gene expression analysis (E2F1, hASH-1)","journal":"Breast cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gain- and loss-of-function with in vivo validation, single lab, mechanistic pathway placement (HES6→E2F1)","pmids":["19891787"],"is_preprint":false},{"year":2010,"finding":"Chick HES6-1 promotes neurogenesis by sequestering other HES proteins and inhibiting their transcriptional repressor activity (protein-protein mechanism), while HES6-2 promotes neurogenesis by directly binding DNA and repressing transcription of Hes5 and Delta genes—indicating two mechanistically distinct subgroups.","method":"Ectopic expression in chick neural tube, reporter assays, domain mutant analysis (DNA-binding mutant of HES6-2)","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo gain-of-function with domain mutant dissection, single lab","pmids":["21151987"],"is_preprint":false},{"year":2013,"finding":"HES6 physically and functionally interacts with RelA-containing NF-κB complexes in cortical progenitor cells, antagonizing NF-κB activity. NF-κB promotes progenitor maintenance and inhibits neuronal differentiation, while HES6 counters this to promote neurogenesis; the two factors exert mutual inhibitory effects.","method":"Co-immunoprecipitation (HES6-RelA), reporter assays, NF-κB blockade/activation experiments in cortical progenitors, in vivo mouse telencephalon analysis","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus functional reporter assay plus in vivo mouse experiments, single lab","pmids":["23689134"],"is_preprint":false},{"year":2023,"finding":"HES6 physically interacts with GATA1 and modulates GATA1's interaction with FOG1 during human erythropoiesis. HES6 knockdown decreases GATA1 expression and impairs erythroid differentiation. ChIP-seq and RNA-seq identified co-regulated erythroid genes. A positive feedback loop comprising HES6, GATA1, and STAT1 is activated by erythropoietin (EPO) signaling.","method":"Co-immunoprecipitation (HES6-GATA1, GATA1-FOG1), ChIP-seq, RNA-seq, siRNA knockdown, in vivo mouse polycythemia vera model","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, ChIP-seq, RNA-seq, and in vivo mouse model, multiple orthogonal methods","pmids":["36929421"],"is_preprint":false},{"year":2024,"finding":"HES6 knockdown in human cord-blood hematopoietic precursors reduces differentiation into erythrocytes, megakaryocytes, plasmacytoid dendritic cells, B cells, and T cells, impairs colony-forming ability in vitro, and reduces hematopoietic reconstitution in vivo. HES6 loss perturbs cell cycle progression during erythroid differentiation.","method":"shRNA knockdown in cord blood HSPCs, in vitro differentiation assays, colony-forming unit assay, competitive transplantation in vivo, single-cell and bulk RNA-seq","journal":"Haematologica","confidence":"High","confidence_rationale":"Tier 2 / Strong — loss-of-function with in vitro and in vivo validation across multiple lineages, multiple orthogonal methods","pmids":["38572564"],"is_preprint":false},{"year":2024,"finding":"STAT3 mutations suppress HES6 expression in bronchial epithelial cells, impairing ciliogenesis and mucociliary transport. A γ-secretase inhibitor increases HES6 expression and rescues ciliogenesis in STAT3 R382W mutant cells, placing HES6 downstream of STAT3 in airway epithelial ciliogenesis.","method":"Lentiviral STAT3 mutant expression, CRISPR/Cas9 STAT3 knockout, transcriptomics, γ-secretase inhibitor rescue, ciliogenesis and mucociliary transport functional assays","journal":"bioRxiv (preprint)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — CRISPR KO plus pharmacological rescue plus functional readouts, single lab, preprint","pmids":[],"is_preprint":true}],"current_model":"HES6 is a bHLH transcription co-factor that promotes neuronal and myogenic differentiation by antagonizing HES1 (through disrupting HES1-TLE/Groucho co-repressor interaction and targeting HES1 for proteolytic degradation), sequestering anti-neurogenic HES proteins via protein–protein interactions, binding Groucho/TLE co-regulators through its WRPW motif to relieve Groucho-mediated repression of proneural targets, and acting as a dimerization hub in oscillatory gene networks; its activity is modulated by CK2-mediated phosphorylation (Ser183), MAPK-mediated phosphorylation of a C-terminal SPXXSP motif, and sumoylation at Lys27/30 that controls proteasomal degradation and oscillatory expression, while in cancer contexts HES6 enhances AR transcriptional output toward E2F1 networks and physically interacts with GATA1 to regulate erythropoiesis."},"narrative":{"mechanistic_narrative":"HES6 is a bHLH transcriptional co-factor that promotes neuronal and myogenic differentiation by antagonizing the anti-neurogenic/anti-myogenic activity of HES1 and related HES/Hairy repressors, acting predominantly through protein–protein interactions rather than its own DNA binding [PMID:10851137, PMID:17065448, PMID:22114720]. HES6 expression is driven by proneural and myogenic transcription factors—induced by neurogenins independently of Notch [PMID:10976052] and a direct target of MyoD/Myf5 [PMID:21501606]—placing it in a positive-feedback differentiation circuit. Mechanistically, HES6 suppresses HES1-mediated repression both by disrupting the HES1–Groucho/TLE co-repressor interaction and by promoting proteolytic degradation of HES1, with both activities depending on its C-terminal WRPW motif and a CK2 phosphorylation site (Ser183) [PMID:12972610]. The WRPW motif mediates direct binding to Groucho/TLE proteins to relieve their repression of proneural and myogenic targets [PMID:11551980, PMID:17950722], and itself functions as a proteasomal degradation signal [PMID:15896295]. HES6 preferentially homodimerizes, and a homodimer-dependent MAPK phosphorylation of a C-terminal SPXXSP motif governs its inhibition of astrocyte differentiation, a function separable from HES1 suppression [PMID:17868320]; sumoylation at Lys27/30 controls its stability and ~2-hour oscillatory expression [PMID:26435136]. In oscillatory networks such as the zebrafish segmentation clock, HES6 acts as a dimerization hub whose sequestration by partner Her proteins reshapes network topology and DNA-binding output [PMID:22278920]. In disease and lineage contexts, HES6 enhances androgen receptor transcriptional output toward E2F1-enriched networks to drive castration-resistant prostate cancer [PMID:24737870], and physically interacts with GATA1 to regulate erythroid and broader hematopoietic differentiation downstream of EPO signaling [PMID:36929421, PMID:38572564].","teleology":[{"year":2000,"claim":"Established that HES6 is not a conventional DNA-binding repressor but a modulator that derepresses proneural activity by counteracting HES1, defining its core regulatory logic.","evidence":"Transcriptional reporter assays, retroviral misexpression in developing retina, and loop-region mutagenesis","pmids":["10851137"],"confidence":"High","gaps":["Did not resolve whether antagonism is via sequestration, co-repressor displacement, or degradation","In vivo developmental requirement not tested by loss-of-function"]},{"year":2000,"claim":"Placed HES6 in a positive-feedback loop downstream of proneural bHLH factors and independent of Notch, explaining how it reinforces rather than opposes neurogenesis.","evidence":"Xenopus ectopic expression, in situ hybridization, and epistasis analysis","pmids":["10976052"],"confidence":"High","gaps":["Direct transcriptional regulation of Hes6 by neurogenins not shown at promoter level","Endogenous requirement not addressed"]},{"year":2001,"claim":"Identified the WRPW-dependent interaction with Groucho/TLE1 and extended HES6 function to myogenesis via repression of the myogenic inhibitor MyoR.","evidence":"Yeast two-hybrid, mammalian Co-IP, GAL4-tethering, reporter assays, and dominant-negative ΔWRPW in myoblasts","pmids":["11551980"],"confidence":"High","gaps":["Whether TLE binding is required for HES1 antagonism not yet distinguished from N-box co-repression","Direct vs indirect MyoR repression unresolved"]},{"year":2002,"claim":"Demonstrated HES6 can directly bind the ESE E-box motif yet showed protein-protein interactions, not DNA binding, drive its myogenic phenotype, separating its two potential modes of action.","evidence":"EMSA, reporter assays, C2C12 overexpression, and Xenopus microinjection with domain mutants","pmids":["11959828"],"confidence":"High","gaps":["Physiological relevance of direct ESE binding in mammals unclear","Effect on terminal differentiation context-dependent"]},{"year":2003,"claim":"Resolved the dual mechanism of HES1 antagonism—co-repressor displacement and proteolytic degradation—and tied both to the WRPW motif and CK2 phosphorylation at Ser183.","evidence":"Co-IP, reporter assays in cortical progenitors, Ser183 mutagenesis, and protein-stability Western blots","pmids":["12972610"],"confidence":"High","gaps":["Identity of the ubiquitin ligase/proteasomal machinery for HES1 not defined","Direct CK2 phosphorylation of HES6 not demonstrated biochemically"]},{"year":2005,"claim":"Showed the WRPW motif doubles as a proteasomal degradation signal, explaining how HES6 stability is intrinsically regulated.","evidence":"Proteasome-inhibition Western blots with WRPW-deletion and WRPW-GFP/GAL4 fusion constructs","pmids":["15896295"],"confidence":"Medium","gaps":["Single lab; degron mechanism and responsible E3 ligase not identified","Relationship to WRPW co-repressor binding not dissected"]},{"year":2005,"claim":"Embedded HES6 in a cyclic Notch-effector circuit by showing reciprocal repression between hes6 and hes5 during neurogenesis.","evidence":"In situ hybridization and gain-of-function electroporation in chick neural tube with epistasis","pmids":["15893982"],"confidence":"Medium","gaps":["Single lab; direct vs indirect repression not established","Loss-of-function not tested"]},{"year":2006,"claim":"Defined an anti-astrogenic role for endogenous HES6 in cortical progenitors and mapped it to nuclear localization plus the LNHLL and WRPW motifs, independent of basic-arm DNA binding.","evidence":"siRNA knockdown, retroviral overexpression, domain mutagenesis, and GFAP immunostaining in cortical progenitors","pmids":["17065448"],"confidence":"High","gaps":["Molecular target mediating astrocyte suppression not identified at this stage","How motifs cooperate mechanistically unresolved"]},{"year":2007,"claim":"Showed HES6 preferentially homodimerizes and that homodimer-dependent MAPK phosphorylation of a SPXXSP motif specifically controls astrocyte inhibition, separating this output from HES1 suppression.","evidence":"Co-IP dimerization assays, N-terminal patch and SPXXSP mutagenesis, reporter and differentiation assays in cortical progenitors","pmids":["17868320"],"confidence":"High","gaps":["Direct MAPK phosphorylation site usage not confirmed in vivo","Downstream effectors of homodimer signaling unknown"]},{"year":2007,"claim":"Demonstrated that HES6 is required for FGF-mediated myogenic induction by binding Groucho proteins to relieve their repression of XmyoD.","evidence":"Morpholino knockdown, Co-IP with Xgrg2/4, and domain-mutant rescue in Xenopus","pmids":["17950722"],"confidence":"High","gaps":["Whether HES6 acts directly at the XmyoD locus not shown","Single-system (Xenopus) finding"]},{"year":2008,"claim":"Connected HES6 to cell-cycle control by identifying a CBP interaction at PML nuclear bodies that induces p21 via p53 acetylation.","evidence":"Co-IP with domain mapping, immunofluorescence, reporter assays, and p53 acetylation/p21 induction assays","pmids":["18160400"],"confidence":"Medium","gaps":["Single lab; not independently replicated","Relevance to neuronal/myogenic differentiation contexts unclear"]},{"year":2010,"claim":"Distinguished two mechanistically distinct HES6 subgroups—one acting by protein sequestration of HES proteins, the other by direct DNA-binding repression of Hes5/Delta.","evidence":"Ectopic expression in chick neural tube with reporter assays and DNA-binding-mutant dissection","pmids":["21151987"],"confidence":"Medium","gaps":["Single lab; mammalian relevance of the two-subgroup model not established","Loss-of-function not assessed"]},{"year":2011,"claim":"Confirmed in vivo that HES6 is required for neural differentiation via WRPW-dependent, DNA-binding-independent dual mechanisms.","evidence":"Morpholino knockdown in Xenopus with DNA-binding and WRPW mutant rescue","pmids":["22114720"],"confidence":"Medium","gaps":["Single lab; specific Hairy/Groucho partners in this context not fully enumerated"]},{"year":2011,"claim":"Identified HES6 as a direct MyoD/Myf5 target controlling cytoskeletal dynamics and myoblast fusion rather than cell-cycle exit, refining its myogenic role.","evidence":"ChIP, siRNA knockdown with rescue, nuclear-localization imaging, F-actin staining, and motility/fusion assays in C2C12","pmids":["21501606"],"confidence":"High","gaps":["Mechanism linking HES6 to F-actin organization not defined here","Transcriptional targets in fusion not identified"]},{"year":2012,"claim":"Established HES6 as a dimerization hub in the zebrafish segmentation clock whose sequestration tunes oscillatory network topology and DNA-binding specificity.","evidence":"In vitro dimerization assays, in vivo zebrafish genetics, EMSA, and computational network analysis","pmids":["22278920"],"confidence":"High","gaps":["Quantitative impact on oscillation period not fully resolved","Mammalian equivalent network not mapped"]},{"year":2012,"claim":"Linked HES6 to oncogenic motility in rhabdomyosarcoma through transcriptional upregulation of the actin regulator TAGLN.","evidence":"siRNA with rescue, expression microarray, and TAGLN epistasis with motility assays","pmids":["22982728"],"confidence":"Medium","gaps":["Single lab; direct vs indirect TAGLN regulation unclear","Whether bHLH partners mediate this not addressed"]},{"year":2009,"claim":"Identified HES6 as an estrogen-inducible driver of breast cancer proliferation acting through induction of E2F1.","evidence":"Lentiviral overexpression, siRNA knockdown, xenografts, and expression analysis of E2F1/hASH-1","pmids":["19891787"],"confidence":"Medium","gaps":["Single lab; direct transcriptional mechanism for E2F1 induction not defined","Connection to bHLH co-factor activity unclear"]},{"year":2014,"claim":"Showed HES6 reprograms androgen receptor transcriptional output toward E2F1 networks to drive ligand-independent, castration-resistant prostate cancer growth.","evidence":"AR/HES6 ChIP-seq, gene expression profiling, overexpression, and xenograft assays","pmids":["24737870"],"confidence":"High","gaps":["Direct physical interaction between HES6 and AR not established","Mechanism of AR genomic redistribution not detailed"]},{"year":2015,"claim":"Demonstrated that sumoylation at Lys27/30 destabilizes HES6, drives its ultradian oscillation, and derepresses HES1, linking post-translational modification to dynamic output.","evidence":"SUMO/ubiquitin Co-IP, stability Westerns, K27R/K30R and SUSP1 mutagenesis, and live-cell GFP-HES6 oscillation imaging","pmids":["26435136"],"confidence":"Medium","gaps":["Single lab; responsible SUMO ligase not identified","Coupling between sumoylation and WRPW degron unresolved"]},{"year":2023,"claim":"Defined a direct HES6–GATA1 interaction that modulates GATA1–FOG1 binding and operates within an EPO-driven HES6/GATA1/STAT1 feedback loop controlling erythropoiesis.","evidence":"Reciprocal Co-IP, ChIP-seq, RNA-seq, siRNA knockdown, and an in vivo polycythemia vera mouse model","pmids":["36929421"],"confidence":"High","gaps":["Structural basis of HES6-GATA1 interaction unknown","Relationship to bHLH/WRPW functions not connected"]},{"year":2024,"claim":"Broadened HES6's hematopoietic role beyond erythropoiesis, showing it is required for multilineage differentiation and reconstitution and for cell-cycle progression during erythropoiesis.","evidence":"shRNA knockdown in cord-blood HSPCs, differentiation and CFU assays, competitive transplantation, and single-cell/bulk RNA-seq","pmids":["38572564"],"confidence":"High","gaps":["Molecular partners in non-erythroid lineages not identified","Mechanism of cell-cycle perturbation undefined"]},{"year":null,"claim":"How the distinct molecular activities of HES6—co-repressor displacement, HES protein sequestration, direct DNA binding, dimerization-hub behavior, and lineage-specific transcription-factor partnerships—are selected in a given cell type, and how its post-translational modifications integrate to set this choice, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified structural/biochemical model of HES6 partner selection","E3 ligases and kinases acting on HES6 not fully identified","Direct AR and proneural-locus binding events incompletely mapped"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,2,3,7,15,20]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,2,7,13]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[4,13,18]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[2,3,9]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[7,12]},{"term_id":"GO:0005654","term_label":"nucleoplasm","supporting_discovery_ids":[10]}],"pathway":[{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[0,1,7,12]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[2,3,15,20]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[14,15,17]}],"complexes":[],"partners":["HES1","TLE1","GRG2","GRG4","CBP","RELA","GATA1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q96HZ4","full_name":"Transcription cofactor HES-6","aliases":["C-HAIRY1","Class B basic helix-loop-helix protein 41","bHLHb41","Hairy and enhancer of split 6"],"length_aa":224,"mass_kda":24.1,"function":"Does not bind DNA itself but suppresses both HES1-mediated N box-dependent transcriptional repression and binding of HES1 to E box sequences. Also suppresses HES1-mediated inhibition of the heterodimer formed by ASCL1/MASH1 and TCF3/E47, allowing ASCL1 and TCF3 to up-regulate transcription in its presence. Promotes cell differentiation (By similarity)","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/Q96HZ4/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/HES6","classification":"Not Classified","n_dependent_lines":10,"n_total_lines":1208,"dependency_fraction":0.008278145695364239},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/HES6","total_profiled":1310},"omim":[{"mim_id":"610331","title":"HES FAMILY bHLH TRANSCRIPTION FACTOR 6; HES6","url":"https://www.omim.org/entry/610331"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nuclear bodies","reliability":"Approved"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"brain","ntpm":56.2},{"tissue":"pituitary gland","ntpm":61.7}],"url":"https://www.proteinatlas.org/search/HES6"},"hgnc":{"alias_symbol":["bHLHb41"],"prev_symbol":[]},"alphafold":{"accession":"Q96HZ4","domains":[],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96HZ4","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q96HZ4-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q96HZ4-F1-predicted_aligned_error_v6.png","plddt_mean":70.31},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=HES6","jax_strain_url":"https://www.jax.org/strain/search?query=HES6"},"sequence":{"accession":"Q96HZ4","fasta_url":"https://rest.uniprot.org/uniprotkb/Q96HZ4.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q96HZ4/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96HZ4"}},"corpus_meta":[{"pmid":"10851137","id":"PMC_10851137","title":"The bHLH gene Hes6, an inhibitor of Hes1, promotes neuronal 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Loop-region swap mutagenesis showed the loop determines HES1- vs HES6-specific functions.\",\n      \"method\": \"Transcriptional reporter assays, retroviral misexpression in developing retina, site-directed mutagenesis of loop region\",\n      \"journal\": \"Development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — multiple orthogonal methods (DNA-binding assays, reporter assays, mutagenesis, in vivo retroviral misexpression), replicated by independent lab in same year (PMID:10976052)\",\n      \"pmids\": [\"10851137\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"HES6 expression is induced by proneural bHLH proteins (neurogenins) but not by the Notch pathway; ectopic HES6 expression in Xenopus embryos promotes neurogenesis, placing HES6 in a positive-feedback loop with proneural factors downstream of neurogenins.\",\n      \"method\": \"Xenopus ectopic expression, in situ hybridization, epistasis analysis\",\n      \"journal\": \"Development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo gain-of-function in Xenopus with pathway placement, replicated across labs\",\n      \"pmids\": [\"10976052\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"HES6 antagonizes HES1 by two mechanisms: (1) it inhibits the interaction of HES1 with its transcriptional co-repressor GRO/TLE, and (2) it promotes proteolytic degradation of HES1. Both effects require the WRPW motif and are reduced when the conserved CK2 phosphorylation site Ser183 is mutated.\",\n      \"method\": \"Co-immunoprecipitation, reporter assays in cortical neural progenitors, site-directed mutagenesis (Ser183), Western blot (protein stability)\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — multiple orthogonal methods (Co-IP, reporter assay, mutagenesis, protein stability) in one rigorous study\",\n      \"pmids\": [\"12972610\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"HES6 interacts with the transcriptional co-repressor TLE1 (Groucho) via its WRPW C-terminal motif, represses transcription from N-box-containing templates, and cooperates with HES1 for maximal N-box repression. HES6 expression induces myotube differentiation by repressing MyoR, a repressor of myogenesis.\",\n      \"method\": \"Yeast two-hybrid and mammalian Co-IP (HES6-TLE1 interaction), reporter assays, GAL4-tethering assay, dominant-negative (ΔWRPW) HES6, myosin heavy chain and MyoR expression analysis\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — yeast two-hybrid plus mammalian Co-IP, reporter assay, dominant-negative rescue, multiple orthogonal methods\",\n      \"pmids\": [\"11551980\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"HES6 binds DNA at the Enhancer of Split E-box (ESE) motif (preferred binding site of Drosophila EoS proteins) and represses ESE-box reporter transcription. Overexpression in C2C12 myoblasts impairs terminal differentiation (decreased p21 induction, increased re-entry into cell cycle). Protein-protein interactions rather than DNA binding are required for the myogenic phenotype in Xenopus.\",\n      \"method\": \"Electrophoretic mobility shift assay (EMSA), reporter assay, C2C12 overexpression, Xenopus microinjection, HES6 domain mutant analysis\",\n      \"journal\": \"Development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — EMSA establishes direct DNA binding, in vitro and in vivo phenotypic rescue with domain mutants\",\n      \"pmids\": [\"11959828\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"The WRPW motif of HES6 acts as a proteasomal degradation signal: WRPW-deletion mutant protein is substantially stabilized due to resistance to proteasomal degradation. Fusion of WRPW to GFP or GAL4-DBD significantly destabilizes these heterologous proteins.\",\n      \"method\": \"Western blot (protein stability after proteasome inhibition), WRPW-deletion and fusion constructs in cell lines\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean deletion/fusion mutagenesis with proteasome inhibitor controls, single lab\",\n      \"pmids\": [\"15896295\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"In chick, hes6-2 represses transcription of hes5 genes (downstream Notch effectors), forming a negative regulatory circuit: hes5 can repress hes6, and hes6 can repress hes5, providing cyclic regulation of Notch signaling during neurogenesis.\",\n      \"method\": \"In situ hybridization, gain-of-function electroporation in chick neural tube, epistasis analysis\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo gain-of-function with epistasis, single lab\",\n      \"pmids\": [\"15893982\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Knockdown of endogenous HES6 in cortical progenitors causes supernumerary cells to adopt an astrocytic fate (GFAP+), while HES6 overexpression inhibits astrocyte differentiation. The anti-astrogenic activity requires nuclear localization and the LNHLL and WRPW peptide motifs but is independent of DNA binding via the basic arm of the bHLH domain.\",\n      \"method\": \"siRNA knockdown, retroviral overexpression, domain deletion/mutation analysis, immunostaining (GFAP), cortical progenitor cultures\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal loss- and gain-of-function with domain mutagenesis, multiple orthogonal methods\",\n      \"pmids\": [\"17065448\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"HES6 preferentially forms homodimers; a conserved N-terminal patch of negatively charged residues antagonizes heterodimerization with HES1. Mutation of this motif enhances HES1 heterodimerization and Hes1 suppression but paradoxically decreases anti-astrogenic activity. A C-terminal SPXXSP motif is phosphorylated by the MAPK pathway and its mutation disrupts anti-astrogenic activity without affecting HES1 suppression, indicating that HES6 homodimer-dependent MAPK phosphorylation governs astrocyte inhibition.\",\n      \"method\": \"Co-IP (dimerization), site-directed mutagenesis (N-terminal patch, SPXXSP), reporter assays, cortical progenitor differentiation assays\",\n      \"journal\": \"Journal of neurochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — mutagenesis combined with Co-IP and functional assays, multiple orthogonal approaches in one study\",\n      \"pmids\": [\"17868320\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"In Xenopus, HES6 is required for FGF-mediated induction of XmyoD expression; the WRPW domain (Groucho-binding) is essential for this activity. HES6 binds Groucho family members Xgrg2 and Xgrg4, relieving their repression of XmyoD expression.\",\n      \"method\": \"Morpholino knockdown in Xenopus, co-immunoprecipitation (HES6-Xgrg2/4 interaction), domain mutant rescue experiments\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — morpholino loss-of-function with Co-IP and domain mutant rescue, multiple orthogonal methods\",\n      \"pmids\": [\"17950722\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"HES6 localizes to promyelocytic leukemia nuclear bodies (PML-NB) and directly interacts with CREB-binding protein (CBP) via its basic domain. This HES6-CBP complex induces p21 CDK inhibitor expression through chromatin remodeling and p53 acetylation, inhibiting cell proliferation.\",\n      \"method\": \"Co-IP (HES6-CBP), immunofluorescence (PML-NB localization), reporter assays, p53 acetylation (Western blot), p21 induction assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with domain mapping plus functional assays, single lab\",\n      \"pmids\": [\"18160400\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"In Xenopus, HES6 depletion by morpholino antisense prevents neural differentiation. Rescue requires WRPW motif (Groucho/TLE binding) but not DNA binding, and HES6 acts through at least two mechanisms: inhibiting anti-neurogenic Hairy proteins and interacting with Groucho/TLE family proteins.\",\n      \"method\": \"Morpholino antisense knockdown in Xenopus, domain mutant rescue (DNA-binding mutant, WRPW mutant)\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo morpholino with domain mutant rescue, single lab\",\n      \"pmids\": [\"22114720\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"HES6 is a direct transcriptional target of MyoD and Myf5 in C2C12 myoblasts. During differentiation, HES6 protein relocates to the nucleus. HES6 siRNA knockdown does not affect cell cycle exit or myosin heavy chain induction but disrupts F-actin filament formation, reduces cell motility, and impairs myoblast fusion.\",\n      \"method\": \"ChIP (MyoD/Myf5 binding to Hes6 promoter), siRNA knockdown, immunofluorescence (nuclear localization), F-actin staining, cell motility assays, siRNA-resistant rescue construct\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP for direct target validation, siRNA with rescue, multiple orthogonal functional readouts\",\n      \"pmids\": [\"21501606\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"In the zebrafish segmentation clock, HES6 serves as a dimerization hub: Her1, Her12, Her15, and Her7 all dimerize with HES6. Her7 sequestration of HES6 reduces HES6 availability for other heterodimers, thereby modulating network topology. Dimers that include HES6 have distinct DNA-binding preferences for cis-regulatory sequences.\",\n      \"method\": \"In vitro dimerization assays, in vivo genetic experiments (zebrafish), electrophoretic mobility shift assay (DNA-binding specificity), computational network analysis\",\n      \"journal\": \"Development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — in vitro reconstitution assays plus in vivo genetic validation plus EMSA, multiple orthogonal approaches\",\n      \"pmids\": [\"22278920\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"HES6 overexpression in rhabdomyosarcoma (ARMSp) cells enhances proliferation and cell motility; knockdown reduces both. HES6 regulates motility via upregulation of Transgelin (TAGLN), an actin cytoskeleton regulator; TAGLN knockdown phenocopies HES6 knockdown motility defect and TAGLN overexpression rescues HES6-knockdown motility loss.\",\n      \"method\": \"siRNA knockdown, mouse Hes6 rescue (siRNA-resistant), expression microarray, TAGLN knockdown/overexpression, cell motility assays\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA with rescue plus epistasis through TAGLN, single lab\",\n      \"pmids\": [\"22982728\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"HES6 enhances androgen receptor (AR) transcriptional activity in prostate cancer cells and redirects AR preferentially to a regulatory network enriched for E2F1 transcription factor targets, driving castration-resistant tumor growth in the absence of ligand.\",\n      \"method\": \"ChIP-seq (AR and HES6 genome-wide binding), gene expression profiling, lentiviral overexpression, xenograft tumor growth assays\",\n      \"journal\": \"EMBO molecular medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP-seq with in vivo xenograft validation and gene network analysis, multiple orthogonal methods\",\n      \"pmids\": [\"24737870\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"SUMO modification of HES6 occurs at lysines 27 and 30. Sumoylation destabilizes HES6 protein (by promoting ubiquitination and proteasomal degradation) and is required for its ~2-hour oscillatory expression rhythm. Sumoylation of HES6 also derepresses HES1-induced transcriptional repression.\",\n      \"method\": \"Co-transfection and immunoprecipitation (sumo/ubiquitin), Western blot (protein stability), site-directed mutagenesis (K27R/K30R and SUMO protease SUSP1), live-cell imaging of GFP-HES6 oscillations\",\n      \"journal\": \"Endocrinology and metabolism\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mutagenesis plus Co-IP plus oscillation imaging, single lab\",\n      \"pmids\": [\"26435136\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"HES6 overexpression in T47D breast cancer cells stimulates proliferation in vitro and tumor growth in xenografts; it induces E2F1 expression, and HES6 siRNA knockdown downregulates E2F1. Estrogen (17β-estradiol) treatment induces HES6 expression in MCF-7 cells, which subsequently induces hASH-1 and E2F1.\",\n      \"method\": \"Lentiviral stable overexpression, siRNA knockdown, xenograft tumor growth assay, gene expression analysis (E2F1, hASH-1)\",\n      \"journal\": \"Breast cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain- and loss-of-function with in vivo validation, single lab, mechanistic pathway placement (HES6→E2F1)\",\n      \"pmids\": [\"19891787\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Chick HES6-1 promotes neurogenesis by sequestering other HES proteins and inhibiting their transcriptional repressor activity (protein-protein mechanism), while HES6-2 promotes neurogenesis by directly binding DNA and repressing transcription of Hes5 and Delta genes—indicating two mechanistically distinct subgroups.\",\n      \"method\": \"Ectopic expression in chick neural tube, reporter assays, domain mutant analysis (DNA-binding mutant of HES6-2)\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo gain-of-function with domain mutant dissection, single lab\",\n      \"pmids\": [\"21151987\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"HES6 physically and functionally interacts with RelA-containing NF-κB complexes in cortical progenitor cells, antagonizing NF-κB activity. NF-κB promotes progenitor maintenance and inhibits neuronal differentiation, while HES6 counters this to promote neurogenesis; the two factors exert mutual inhibitory effects.\",\n      \"method\": \"Co-immunoprecipitation (HES6-RelA), reporter assays, NF-κB blockade/activation experiments in cortical progenitors, in vivo mouse telencephalon analysis\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus functional reporter assay plus in vivo mouse experiments, single lab\",\n      \"pmids\": [\"23689134\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"HES6 physically interacts with GATA1 and modulates GATA1's interaction with FOG1 during human erythropoiesis. HES6 knockdown decreases GATA1 expression and impairs erythroid differentiation. ChIP-seq and RNA-seq identified co-regulated erythroid genes. A positive feedback loop comprising HES6, GATA1, and STAT1 is activated by erythropoietin (EPO) signaling.\",\n      \"method\": \"Co-immunoprecipitation (HES6-GATA1, GATA1-FOG1), ChIP-seq, RNA-seq, siRNA knockdown, in vivo mouse polycythemia vera model\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, ChIP-seq, RNA-seq, and in vivo mouse model, multiple orthogonal methods\",\n      \"pmids\": [\"36929421\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"HES6 knockdown in human cord-blood hematopoietic precursors reduces differentiation into erythrocytes, megakaryocytes, plasmacytoid dendritic cells, B cells, and T cells, impairs colony-forming ability in vitro, and reduces hematopoietic reconstitution in vivo. HES6 loss perturbs cell cycle progression during erythroid differentiation.\",\n      \"method\": \"shRNA knockdown in cord blood HSPCs, in vitro differentiation assays, colony-forming unit assay, competitive transplantation in vivo, single-cell and bulk RNA-seq\",\n      \"journal\": \"Haematologica\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — loss-of-function with in vitro and in vivo validation across multiple lineages, multiple orthogonal methods\",\n      \"pmids\": [\"38572564\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"STAT3 mutations suppress HES6 expression in bronchial epithelial cells, impairing ciliogenesis and mucociliary transport. A γ-secretase inhibitor increases HES6 expression and rescues ciliogenesis in STAT3 R382W mutant cells, placing HES6 downstream of STAT3 in airway epithelial ciliogenesis.\",\n      \"method\": \"Lentiviral STAT3 mutant expression, CRISPR/Cas9 STAT3 knockout, transcriptomics, γ-secretase inhibitor rescue, ciliogenesis and mucociliary transport functional assays\",\n      \"journal\": \"bioRxiv (preprint)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — CRISPR KO plus pharmacological rescue plus functional readouts, single lab, preprint\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"HES6 is a bHLH transcription co-factor that promotes neuronal and myogenic differentiation by antagonizing HES1 (through disrupting HES1-TLE/Groucho co-repressor interaction and targeting HES1 for proteolytic degradation), sequestering anti-neurogenic HES proteins via protein–protein interactions, binding Groucho/TLE co-regulators through its WRPW motif to relieve Groucho-mediated repression of proneural targets, and acting as a dimerization hub in oscillatory gene networks; its activity is modulated by CK2-mediated phosphorylation (Ser183), MAPK-mediated phosphorylation of a C-terminal SPXXSP motif, and sumoylation at Lys27/30 that controls proteasomal degradation and oscillatory expression, while in cancer contexts HES6 enhances AR transcriptional output toward E2F1 networks and physically interacts with GATA1 to regulate erythropoiesis.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"HES6 is a bHLH transcriptional co-factor that promotes neuronal and myogenic differentiation by antagonizing the anti-neurogenic/anti-myogenic activity of HES1 and related HES/Hairy repressors, acting predominantly through protein\\u2013protein interactions rather than its own DNA binding [#0, #7, #11]. HES6 expression is driven by proneural and myogenic transcription factors\\u2014induced by neurogenins independently of Notch [#1] and a direct target of MyoD/Myf5 [#12]\\u2014placing it in a positive-feedback differentiation circuit. Mechanistically, HES6 suppresses HES1-mediated repression both by disrupting the HES1\\u2013Groucho/TLE co-repressor interaction and by promoting proteolytic degradation of HES1, with both activities depending on its C-terminal WRPW motif and a CK2 phosphorylation site (Ser183) [#2]. The WRPW motif mediates direct binding to Groucho/TLE proteins to relieve their repression of proneural and myogenic targets [#3, #9], and itself functions as a proteasomal degradation signal [#5]. HES6 preferentially homodimerizes, and a homodimer-dependent MAPK phosphorylation of a C-terminal SPXXSP motif governs its inhibition of astrocyte differentiation, a function separable from HES1 suppression [#8]; sumoylation at Lys27/30 controls its stability and ~2-hour oscillatory expression [#16]. In oscillatory networks such as the zebrafish segmentation clock, HES6 acts as a dimerization hub whose sequestration by partner Her proteins reshapes network topology and DNA-binding output [#13]. In disease and lineage contexts, HES6 enhances androgen receptor transcriptional output toward E2F1-enriched networks to drive castration-resistant prostate cancer [#15], and physically interacts with GATA1 to regulate erythroid and broader hematopoietic differentiation downstream of EPO signaling [#20, #21].\",\n  \"teleology\": [\n    {\n      \"year\": 2000,\n      \"claim\": \"Established that HES6 is not a conventional DNA-binding repressor but a modulator that derepresses proneural activity by counteracting HES1, defining its core regulatory logic.\",\n      \"evidence\": \"Transcriptional reporter assays, retroviral misexpression in developing retina, and loop-region mutagenesis\",\n      \"pmids\": [\"10851137\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve whether antagonism is via sequestration, co-repressor displacement, or degradation\", \"In vivo developmental requirement not tested by loss-of-function\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Placed HES6 in a positive-feedback loop downstream of proneural bHLH factors and independent of Notch, explaining how it reinforces rather than opposes neurogenesis.\",\n      \"evidence\": \"Xenopus ectopic expression, in situ hybridization, and epistasis analysis\",\n      \"pmids\": [\"10976052\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct transcriptional regulation of Hes6 by neurogenins not shown at promoter level\", \"Endogenous requirement not addressed\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Identified the WRPW-dependent interaction with Groucho/TLE1 and extended HES6 function to myogenesis via repression of the myogenic inhibitor MyoR.\",\n      \"evidence\": \"Yeast two-hybrid, mammalian Co-IP, GAL4-tethering, reporter assays, and dominant-negative \\u0394WRPW in myoblasts\",\n      \"pmids\": [\"11551980\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether TLE binding is required for HES1 antagonism not yet distinguished from N-box co-repression\", \"Direct vs indirect MyoR repression unresolved\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Demonstrated HES6 can directly bind the ESE E-box motif yet showed protein-protein interactions, not DNA binding, drive its myogenic phenotype, separating its two potential modes of action.\",\n      \"evidence\": \"EMSA, reporter assays, C2C12 overexpression, and Xenopus microinjection with domain mutants\",\n      \"pmids\": [\"11959828\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological relevance of direct ESE binding in mammals unclear\", \"Effect on terminal differentiation context-dependent\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Resolved the dual mechanism of HES1 antagonism\\u2014co-repressor displacement and proteolytic degradation\\u2014and tied both to the WRPW motif and CK2 phosphorylation at Ser183.\",\n      \"evidence\": \"Co-IP, reporter assays in cortical progenitors, Ser183 mutagenesis, and protein-stability Western blots\",\n      \"pmids\": [\"12972610\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the ubiquitin ligase/proteasomal machinery for HES1 not defined\", \"Direct CK2 phosphorylation of HES6 not demonstrated biochemically\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Showed the WRPW motif doubles as a proteasomal degradation signal, explaining how HES6 stability is intrinsically regulated.\",\n      \"evidence\": \"Proteasome-inhibition Western blots with WRPW-deletion and WRPW-GFP/GAL4 fusion constructs\",\n      \"pmids\": [\"15896295\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab; degron mechanism and responsible E3 ligase not identified\", \"Relationship to WRPW co-repressor binding not dissected\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Embedded HES6 in a cyclic Notch-effector circuit by showing reciprocal repression between hes6 and hes5 during neurogenesis.\",\n      \"evidence\": \"In situ hybridization and gain-of-function electroporation in chick neural tube with epistasis\",\n      \"pmids\": [\"15893982\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab; direct vs indirect repression not established\", \"Loss-of-function not tested\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Defined an anti-astrogenic role for endogenous HES6 in cortical progenitors and mapped it to nuclear localization plus the LNHLL and WRPW motifs, independent of basic-arm DNA binding.\",\n      \"evidence\": \"siRNA knockdown, retroviral overexpression, domain mutagenesis, and GFAP immunostaining in cortical progenitors\",\n      \"pmids\": [\"17065448\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular target mediating astrocyte suppression not identified at this stage\", \"How motifs cooperate mechanistically unresolved\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Showed HES6 preferentially homodimerizes and that homodimer-dependent MAPK phosphorylation of a SPXXSP motif specifically controls astrocyte inhibition, separating this output from HES1 suppression.\",\n      \"evidence\": \"Co-IP dimerization assays, N-terminal patch and SPXXSP mutagenesis, reporter and differentiation assays in cortical progenitors\",\n      \"pmids\": [\"17868320\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct MAPK phosphorylation site usage not confirmed in vivo\", \"Downstream effectors of homodimer signaling unknown\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Demonstrated that HES6 is required for FGF-mediated myogenic induction by binding Groucho proteins to relieve their repression of XmyoD.\",\n      \"evidence\": \"Morpholino knockdown, Co-IP with Xgrg2/4, and domain-mutant rescue in Xenopus\",\n      \"pmids\": [\"17950722\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether HES6 acts directly at the XmyoD locus not shown\", \"Single-system (Xenopus) finding\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Connected HES6 to cell-cycle control by identifying a CBP interaction at PML nuclear bodies that induces p21 via p53 acetylation.\",\n      \"evidence\": \"Co-IP with domain mapping, immunofluorescence, reporter assays, and p53 acetylation/p21 induction assays\",\n      \"pmids\": [\"18160400\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab; not independently replicated\", \"Relevance to neuronal/myogenic differentiation contexts unclear\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Distinguished two mechanistically distinct HES6 subgroups\\u2014one acting by protein sequestration of HES proteins, the other by direct DNA-binding repression of Hes5/Delta.\",\n      \"evidence\": \"Ectopic expression in chick neural tube with reporter assays and DNA-binding-mutant dissection\",\n      \"pmids\": [\"21151987\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab; mammalian relevance of the two-subgroup model not established\", \"Loss-of-function not assessed\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Confirmed in vivo that HES6 is required for neural differentiation via WRPW-dependent, DNA-binding-independent dual mechanisms.\",\n      \"evidence\": \"Morpholino knockdown in Xenopus with DNA-binding and WRPW mutant rescue\",\n      \"pmids\": [\"22114720\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab; specific Hairy/Groucho partners in this context not fully enumerated\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Identified HES6 as a direct MyoD/Myf5 target controlling cytoskeletal dynamics and myoblast fusion rather than cell-cycle exit, refining its myogenic role.\",\n      \"evidence\": \"ChIP, siRNA knockdown with rescue, nuclear-localization imaging, F-actin staining, and motility/fusion assays in C2C12\",\n      \"pmids\": [\"21501606\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism linking HES6 to F-actin organization not defined here\", \"Transcriptional targets in fusion not identified\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Established HES6 as a dimerization hub in the zebrafish segmentation clock whose sequestration tunes oscillatory network topology and DNA-binding specificity.\",\n      \"evidence\": \"In vitro dimerization assays, in vivo zebrafish genetics, EMSA, and computational network analysis\",\n      \"pmids\": [\"22278920\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Quantitative impact on oscillation period not fully resolved\", \"Mammalian equivalent network not mapped\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Linked HES6 to oncogenic motility in rhabdomyosarcoma through transcriptional upregulation of the actin regulator TAGLN.\",\n      \"evidence\": \"siRNA with rescue, expression microarray, and TAGLN epistasis with motility assays\",\n      \"pmids\": [\"22982728\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab; direct vs indirect TAGLN regulation unclear\", \"Whether bHLH partners mediate this not addressed\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Identified HES6 as an estrogen-inducible driver of breast cancer proliferation acting through induction of E2F1.\",\n      \"evidence\": \"Lentiviral overexpression, siRNA knockdown, xenografts, and expression analysis of E2F1/hASH-1\",\n      \"pmids\": [\"19891787\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab; direct transcriptional mechanism for E2F1 induction not defined\", \"Connection to bHLH co-factor activity unclear\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Showed HES6 reprograms androgen receptor transcriptional output toward E2F1 networks to drive ligand-independent, castration-resistant prostate cancer growth.\",\n      \"evidence\": \"AR/HES6 ChIP-seq, gene expression profiling, overexpression, and xenograft assays\",\n      \"pmids\": [\"24737870\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct physical interaction between HES6 and AR not established\", \"Mechanism of AR genomic redistribution not detailed\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Demonstrated that sumoylation at Lys27/30 destabilizes HES6, drives its ultradian oscillation, and derepresses HES1, linking post-translational modification to dynamic output.\",\n      \"evidence\": \"SUMO/ubiquitin Co-IP, stability Westerns, K27R/K30R and SUSP1 mutagenesis, and live-cell GFP-HES6 oscillation imaging\",\n      \"pmids\": [\"26435136\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab; responsible SUMO ligase not identified\", \"Coupling between sumoylation and WRPW degron unresolved\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Defined a direct HES6\\u2013GATA1 interaction that modulates GATA1\\u2013FOG1 binding and operates within an EPO-driven HES6/GATA1/STAT1 feedback loop controlling erythropoiesis.\",\n      \"evidence\": \"Reciprocal Co-IP, ChIP-seq, RNA-seq, siRNA knockdown, and an in vivo polycythemia vera mouse model\",\n      \"pmids\": [\"36929421\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of HES6-GATA1 interaction unknown\", \"Relationship to bHLH/WRPW functions not connected\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Broadened HES6's hematopoietic role beyond erythropoiesis, showing it is required for multilineage differentiation and reconstitution and for cell-cycle progression during erythropoiesis.\",\n      \"evidence\": \"shRNA knockdown in cord-blood HSPCs, differentiation and CFU assays, competitive transplantation, and single-cell/bulk RNA-seq\",\n      \"pmids\": [\"38572564\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular partners in non-erythroid lineages not identified\", \"Mechanism of cell-cycle perturbation undefined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the distinct molecular activities of HES6\\u2014co-repressor displacement, HES protein sequestration, direct DNA binding, dimerization-hub behavior, and lineage-specific transcription-factor partnerships\\u2014are selected in a given cell type, and how its post-translational modifications integrate to set this choice, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified structural/biochemical model of HES6 partner selection\", \"E3 ligases and kinases acting on HES6 not fully identified\", \"Direct AR and proneural-locus binding events incompletely mapped\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 2, 3, 7, 15, 20]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 2, 7, 13]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [4, 13, 18]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [2, 3, 9]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [7, 12]},\n      {\"term_id\": \"GO:0005654\", \"supporting_discovery_ids\": [10]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [0, 1, 7, 12]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [2, 3, 15, 20]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [14, 15, 17]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"HES1\", \"TLE1\", \"GRG2\", \"GRG4\", \"CBP\", \"RELA\", \"GATA1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}