| 2000 |
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. |
Transcriptional reporter assays, retroviral misexpression in developing retina, site-directed mutagenesis of loop region |
Development |
High |
10851137
|
| 2000 |
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. |
Xenopus ectopic expression, in situ hybridization, epistasis analysis |
Development |
High |
10976052
|
| 2003 |
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. |
Co-immunoprecipitation, reporter assays in cortical neural progenitors, site-directed mutagenesis (Ser183), Western blot (protein stability) |
Molecular and cellular biology |
High |
12972610
|
| 2001 |
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. |
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 |
The Journal of cell biology |
High |
11551980
|
| 2002 |
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. |
Electrophoretic mobility shift assay (EMSA), reporter assay, C2C12 overexpression, Xenopus microinjection, HES6 domain mutant analysis |
Development |
High |
11959828
|
| 2005 |
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. |
Western blot (protein stability after proteasome inhibition), WRPW-deletion and fusion constructs in cell lines |
Biochemical and biophysical research communications |
Medium |
15896295
|
| 2005 |
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. |
In situ hybridization, gain-of-function electroporation in chick neural tube, epistasis analysis |
Developmental biology |
Medium |
15893982
|
| 2006 |
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. |
siRNA knockdown, retroviral overexpression, domain deletion/mutation analysis, immunostaining (GFAP), cortical progenitor cultures |
The Journal of neuroscience |
High |
17065448
|
| 2007 |
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. |
Co-IP (dimerization), site-directed mutagenesis (N-terminal patch, SPXXSP), reporter assays, cortical progenitor differentiation assays |
Journal of neurochemistry |
High |
17868320
|
| 2007 |
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. |
Morpholino knockdown in Xenopus, co-immunoprecipitation (HES6-Xgrg2/4 interaction), domain mutant rescue experiments |
Developmental biology |
High |
17950722
|
| 2007 |
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. |
Co-IP (HES6-CBP), immunofluorescence (PML-NB localization), reporter assays, p53 acetylation (Western blot), p21 induction assays |
The Journal of biological chemistry |
Medium |
18160400
|
| 2011 |
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. |
Morpholino antisense knockdown in Xenopus, domain mutant rescue (DNA-binding mutant, WRPW mutant) |
PloS one |
Medium |
22114720
|
| 2011 |
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. |
ChIP (MyoD/Myf5 binding to Hes6 promoter), siRNA knockdown, immunofluorescence (nuclear localization), F-actin staining, cell motility assays, siRNA-resistant rescue construct |
Experimental cell research |
High |
21501606
|
| 2012 |
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. |
In vitro dimerization assays, in vivo genetic experiments (zebrafish), electrophoretic mobility shift assay (DNA-binding specificity), computational network analysis |
Development |
High |
22278920
|
| 2012 |
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. |
siRNA knockdown, mouse Hes6 rescue (siRNA-resistant), expression microarray, TAGLN knockdown/overexpression, cell motility assays |
Experimental cell research |
Medium |
22982728
|
| 2014 |
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. |
ChIP-seq (AR and HES6 genome-wide binding), gene expression profiling, lentiviral overexpression, xenograft tumor growth assays |
EMBO molecular medicine |
High |
24737870
|
| 2015 |
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. |
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 |
Endocrinology and metabolism |
Medium |
26435136
|
| 2009 |
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. |
Lentiviral stable overexpression, siRNA knockdown, xenograft tumor growth assay, gene expression analysis (E2F1, hASH-1) |
Breast cancer research |
Medium |
19891787
|
| 2010 |
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. |
Ectopic expression in chick neural tube, reporter assays, domain mutant analysis (DNA-binding mutant of HES6-2) |
PloS one |
Medium |
21151987
|
| 2013 |
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. |
Co-immunoprecipitation (HES6-RelA), reporter assays, NF-κB blockade/activation experiments in cortical progenitors, in vivo mouse telencephalon analysis |
Molecular and cellular biology |
Medium |
23689134
|
| 2023 |
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. |
Co-immunoprecipitation (HES6-GATA1, GATA1-FOG1), ChIP-seq, RNA-seq, siRNA knockdown, in vivo mouse polycythemia vera model |
Nucleic acids research |
High |
36929421
|
| 2024 |
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. |
shRNA knockdown in cord blood HSPCs, in vitro differentiation assays, colony-forming unit assay, competitive transplantation in vivo, single-cell and bulk RNA-seq |
Haematologica |
High |
38572564
|
| 2024 |
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. |
Lentiviral STAT3 mutant expression, CRISPR/Cas9 STAT3 knockout, transcriptomics, γ-secretase inhibitor rescue, ciliogenesis and mucociliary transport functional assays |
bioRxiv (preprint)preprint |
Medium |
|