| 2000 |
HES6 alone does not bind DNA but suppresses HES1 from repressing transcription, and suppresses HES1 from inhibiting MASH1-E47 heterodimer, thereby enabling MASH1 and E47 to upregulate transcription in the presence of HES1. Mutation analysis revealed that the loop region of HES proteins plays an important role in specific functions. |
Transfection reporter assays, retroviral misexpression in developing retina, mutagenesis of loop region |
Development |
High |
10851137
|
| 2000 |
HES6 expression is induced by proneural bHLH proteins (neurogenins) but not by the Notch pathway, and ectopic HES6 expression in Xenopus embryos promotes neurogenesis, placing HES6 in a positive feedback loop with proneural bHLH proteins. |
In situ hybridization, ectopic expression in Xenopus embryos, epistasis analysis |
Development |
High |
10976052
|
| 2003 |
HES6 antagonizes HES1 function by two mechanisms: (1) inhibiting the interaction of HES1 with its transcriptional corepressor GRO/TLE, and (2) promoting proteolytic degradation of HES1. The effect on HES1 degradation is maximal when both proteins contain the WRPW motif and is reduced when HES6 Ser183 (a CK2 phosphorylation site) is mutated. |
Co-immunoprecipitation, transfection reporter assays in cortical neural progenitor cells, mutagenesis of WRPW motif and Ser183, Western blotting for protein levels |
Molecular and cellular biology |
High |
12972610
|
| 2001 |
HES6 interacts with the corepressor TLE1 (Groucho) through its WRPW C-terminal motif in both yeast and mammalian cells. HES6 represses transcription from N-box-containing templates and cooperates with HES1 for maximal repression. HES6 expression induces myoblast differentiation and inhibits MyoR, a repressor of myogenesis; dominant-negative WRPW-deleted HES6 blocks the muscle development program. |
Yeast two-hybrid, co-immunoprecipitation, reporter assays, GAL4-fusion tethering, stable transfection/dominant-negative in C2C12 cells |
The Journal of cell biology |
High |
11551980
|
| 2002 |
HES6 binds DNA containing the Enhancer of Split E box (ESE) motif and represses transcription from an ESE box reporter. Overexpression in C2C12 cells impairs differentiation, decreasing p21Cip1 induction and increasing re-entry into the cell cycle. In Xenopus, HES6 microinjection expands the myotome but suppresses terminal differentiation; mutagenesis shows DNA-binding is not essential but protein-protein interactions are required for the myogenic phenotype. |
DNA binding assays (ESE box), reporter assays, C2C12 overexpression, cell cycle analysis, Xenopus microinjection, mutagenesis |
Development |
High |
11959828
|
| 2005 |
HES6-2 (chick) represses transcription of hes5 genes, functioning as a negative regulator of Notch signaling. Conversely, hes5 activity can repress hes6-2. Proneural genes upregulate hes6-2, which then prevents Notch activity in differentiating cells, forming a hes5/hes6 circuitry of negative cross-regulation. |
In situ hybridization, ectopic expression, epistasis analysis in chick neural tissue |
Developmental biology |
Medium |
15893982
|
| 2005 |
The WRPW motif of HES6 acts as a degradation signal mediating proteasomal degradation; deletion of the WRPW motif substantially stabilizes HES6, and fusion of the WRPW motif to heterologous proteins (GFP, Gal4 DBD) is sufficient to destabilize them. |
Protein stability assays, proteasome inhibitor treatment, WRPW deletion mutagenesis, GFP- and Gal4-WRPW fusion proteins |
Biochemical and biophysical research communications |
High |
15896295
|
| 2006 |
HES6 knockdown causes cortical progenitors to adopt astrocytic morphology and express GFAP, while exogenous HES6 inhibits astrocyte differentiation. Neither the proneuronal nor anti-gliogenic functions depend on HES6 DNA-binding via the basic arm, but both require nuclear localization; only the anti-gliogenic function depends on LNHLL and WRPW peptides. Nuclear localization is required for both activities. |
siRNA knockdown, exogenous expression, mutagenesis of basic domain/LNHLL/WRPW, immunofluorescence for GFAP and neuronal markers in cortical progenitors |
The Journal of neuroscience |
High |
17065448
|
| 2007 |
HES6 preferentially forms homodimers; heterodimerization with HES1 is antagonized in part by a conserved N-terminal patch of negatively charged residues. A C-terminal SPXXSP motif is phosphorylated by the MAPK pathway and is required for anti-astrogenic activity of HES6 but not for suppression of HES1. Thus, HES6 homodimers regulate astrocyte differentiation through MAPK-dependent phosphorylation of the C-terminal domain. |
Co-immunoprecipitation for dimerization, mutagenesis of N-terminal patch and C-terminal SPXXSP, MAPK phosphorylation assays, cortical progenitor differentiation assays |
Journal of neurochemistry |
High |
17868320
|
| 2007 |
HES6 is required for FGF-mediated induction of XmyoD expression in Xenopus gastrulae. The WRPW domain of HES6 (which binds Groucho/TLE co-regulators) is essential for this activity. HES6 binds Groucho proteins Xgrg2 and Xgrg4 and relieves their inhibition of XmyoD expression. |
Morpholino knockdown in Xenopus, co-immunoprecipitation of HES6 with Groucho proteins, WRPW mutagenesis, FGF pathway epistasis |
Developmental biology |
High |
17950722
|
| 2007 |
HES6 is a component of the PML nuclear body complex and directly interacts with CBP (CREB-binding protein) via its basic domain. This HES6-CBP interaction inhibits cell proliferation by inducing p21 CDK inhibitor through chromatin remodeling and p53 acetylation. |
Co-immunoprecipitation, co-localization/immunofluorescence in PML-NBs, basic domain mutagenesis, p21 reporter and Western blot, p53 acetylation assay |
The Journal of biological chemistry |
High |
18160400
|
| 2009 |
Overexpression of HES6 induces apoptosis in primary cultured cortical neurons via p53- and Bax-dependent pathways; neuronal apoptosis is markedly blunted in p53-/- or Bax-/- neurons. Transactivation-defective HES6 mutants also enhance neuronal apoptosis, indicating the apoptogenic activity is not directly tied to transcriptional regulation. |
Overexpression in primary cultured cortical neurons, apoptosis assays, p53-/- and Bax-/- knockout neurons, transactivation-defective mutants |
Brain research |
Medium |
19968968
|
| 2011 |
HES6 is a direct transcriptional target of the myogenic factors MyoD and Myf5. HES6 protein becomes predominantly nuclear during differentiation. Knockdown of HES6 in C2C12 myoblasts disrupts F-actin filament formation and reduces cell motility and myoblast fusion without affecting cell cycle exit or myosin heavy chain induction. |
ChIP for MyoD/Myf5 binding to Hes6 locus, siRNA knockdown, immunofluorescence for Hes6 localization, phalloidin staining for F-actin, cell motility assay, rescue with siRNA-resistant cDNA |
Experimental cell research |
High |
21501606
|
| 2011 |
Xenopus HES6 is essential for neurogenesis in vivo: morpholino depletion blocks neural differentiation, rescued by wild-type HES6 or a DNA-binding-deficient mutant but only partially by a Groucho/TLE-binding-deficient (WRPW-mutant) HES6. HES6 promotes neurogenesis by inhibiting anti-neurogenic Xhairy proteins and through interaction with Groucho/TLE family proteins. |
Morpholino antisense knockdown in Xenopus, rescue with wild-type and mutant HES6 constructs, in vivo neurogenesis assays |
PloS one |
High |
22114720
|
| 2012 |
In the zebrafish segmentation clock, HES6 serves as the dimerization hub of the Her/Hes protein network. Her1, Her12, Her15, and Her7 each dimerize with HES6 with different affinities and DNA-binding preferences. Her7 sequesters HES6 and thereby modulates network topology by reducing HES6 availability for other heterodimers. |
In vitro dimerization assays, DNA-binding assays, genetic experiments in zebrafish, computational network modeling |
Development |
High |
22278920
|
| 2012 |
HES6 knockdown in alveolar rhabdomyosarcoma (ARMSp) cells reduces proliferation and cell motility. The motility defect is associated with decreased Transgelin (TAGLN) expression; TAGLN knockdown recapitulates the motility defect and TAGLN overexpression rescues it, placing TAGLN downstream of HES6 in regulation of actin cytoskeleton and motility. |
siRNA knockdown, rescue with mouse Hes6 (siRNA-resistant), expression microarray, TAGLN knockdown and overexpression, cell motility assays |
Experimental cell research |
Medium |
22982728
|
| 2012 |
HES6 and HES1 regulate the human LDLR promoter in a circadian context: CLOCK/BMAL1 upregulates LDLR promoter activity while HES1 and HES6 downregulate it under serum-depleted conditions. The repressive effect of HES1 maps to the SRE element. HES6 mRNA oscillates anti-phasically to HES1 mRNA in wild-type but not per1-/-per2-/- mice; CLOCK/BMAL1 induces HES6 via a conserved E-box in exon IV. |
Reporter assays in HepG2 cells, site-directed mutagenesis of SRE and E-box elements, qRT-PCR in mouse tissues, transfection in per1/per2 double-KO mice |
Experimental & molecular medicine |
Medium |
22913986
|
| 2013 |
HES6 physically and functionally interacts with RelA-containing NF-κB complexes in cortical progenitor cells. NF-κB is selectively activated in neocortical neural progenitors and its blockade leads to premature neuronal differentiation; HES6 antagonizes NF-κB's pro-progenitor effect, and NF-κB in turn inhibits HES6's proneuronal activity. |
Co-immunoprecipitation of HES6 with RelA, NF-κB blockade and activation in cortical progenitors, neurogenesis assays, epistasis analysis |
Molecular and cellular biology |
Medium |
23689134
|
| 2014 |
HES6 enhances the transcriptional activity of the androgen receptor (AR) in the absence of ligand, preferentially directing AR to a regulatory network enriched for E2F1 transcription factor binding sites, driving castration-resistant prostate cancer growth. PLK1 inhibition can pharmacologically target this HES6-AR-E2F1 axis. |
Overexpression and knockdown of HES6 in prostate cancer cells, AR ChIP-seq, gene expression profiling, xenograft tumor growth assays, pharmacological PLK1 inhibition |
EMBO molecular medicine |
High |
24737870
|
| 2015 |
HES6 sumoylation occurs at lysine residues K27 and K30; sumoylation decreases HES6 protein stability by promoting ubiquitination and proteasomal degradation. Sumoylation also regulates the oscillatory period of HES6 expression and derepresses HES1-induced transcriptional repression. |
Overexpression of SUMO and HES6 in HeLa cells, co-immunoprecipitation, Western blotting, site-directed mutagenesis (K27R/K30R), SUMO protease SUSP1 co-expression, luciferase reporter assays for HES1 repression, GFP-HES6 oscillation imaging in NIH 3T3 cells |
Endocrinology and metabolism |
Medium |
26435136
|
| 2010 |
Two subgroups of HES6 proteins (HES6-1 and HES6-2) function through distinct mechanisms: cHES6-2 represses transcription of Hes genes by DNA-binding and transcriptional repression; cHES6-1 sequesters other HES proteins and inhibits their activity as transcriptional repressors without requiring DNA binding. Together they progressively shut down Notch-mediated progenitor programming. |
Ectopic expression in chick embryonic neural tube, reporter assays for cDelta1 and cHes5, mutagenesis for DNA-binding deficiency, epistasis with Notch pathway |
PloS one |
Medium |
21151987
|
| 2023 |
HES6 physically interacts with GATA1 and influences the interaction of GATA1 with FOG1. HES6 knockdown impairs human erythropoiesis by decreasing GATA1 expression. ChIP-seq and RNA-seq revealed co-regulated erythroid genes. A positive feedback loop composed of HES6, GATA1, and STAT1 regulates erythropoiesis, and EPO stimulation upregulates all loop components. |
Co-immunoprecipitation of HES6 with GATA1/FOG1, ChIP-seq, RNA-seq, siRNA knockdown in erythroid progenitors, in vivo mouse model with JAK2V617F |
Nucleic acids research |
High |
36929421
|
| 2024 |
HES6 knockdown in cord blood-derived hematopoietic precursors reduces differentiation toward megakaryocytes, erythrocytes, plasmacytoid dendritic cells, B cells, and T cells in vitro. In vivo, HES6 knockdown HSPCs show impaired hematopoietic reconstitution in competitive transplantation. Loss of HES6 impacts cell cycle progression during erythroid differentiation. |
siRNA/shRNA knockdown in human cord blood HSCs, in vitro lineage differentiation assays, competitive transplantation in mice, single-cell RNA-seq, colony-forming unit assay |
Haematologica |
High |
38572564
|
| 2017 |
The lncRNA lncSHRG recruits the chromatin organizer SATB1 to bind the HES6 promoter and initiates HES6 expression, promoting hepatocellular carcinoma cell proliferation. |
ChIP assay showing SATB1 binding to HES6 promoter, lncSHRG knockdown, HES6 overexpression/knockdown, in vivo tumor propagation in mice |
Oncotarget |
Medium |
29050307
|