| 1997 |
FOXH1 (FAST-1) forms a trimeric activin-responsive factor (ARF) complex with Smad2 and Smad4 in a ligand-regulated fashion. The C-terminal domain of FAST-1 interacts with Smad2 (but not Smad4) in a yeast two-hybrid assay; Smad4 stabilizes the ligand-stimulated Smad2-FAST-1 complex as an active DNA-binding factor. Overexpression of the FAST-1 C-terminal domain specifically inhibits activin signaling. |
Co-immunoprecipitation, yeast two-hybrid assay, deletion mutagenesis, dominant-negative overexpression |
Nature |
High |
9288972
|
| 1998 |
Human FOXH1 (hFAST-1) binds Smad2 and activates an activin response element (ARE) containing the DNA motif TGT(G/T)(T/G)ATT. hFAST-1-dependent activation of ARE requires endogenous Smad4 and a TGF-β-like ligand. A single copy of the FOXH1 DNA motif activates a reporter in a TGF-β-dependent fashion only when an adjacent Smad-binding element is present. |
Reporter assay, DNA binding assay, co-immunoprecipitation, Smad4-null cell complementation |
Molecular cell |
High |
9702198
|
| 1998 |
Mouse Fast1 (Foxh1) associates with Smads in response to activin/TGF-β signal to form a complex that recognizes the Xenopus ARE. Introduction of Fast1 into intact cells confers activin/TGF-β regulation of an ARE-luciferase reporter. |
Co-immunoprecipitation, luciferase reporter assay, in vitro binding assay |
Mechanisms of development |
Medium |
10349617
|
| 1999 |
FAST-1 is a key mediator of mesoderm induction by TGF-β superfamily ligands: constitutively active FAST-VP16 induces mesodermal and endodermal genes in ectoderm and secondary axes; a FAST-1 repressor fusion (FAST-En(R)) blocks mesodermal gene induction by activin; a blocking antibody against FAST-1 prevents induction of mesodermal genes by activin or Vg1 but not FGF. |
Dominant-active and dominant-negative overexpression in Xenopus embryos, blocking antibody injection, gene expression analysis |
Development (Cambridge, England) |
High |
10572039
|
| 1999 |
ARF (containing FAST-1/Smad2/Smad4) binds the ARE through both FAST-1 and Smad DNA-binding sites. FAST-1 recognition of the ARE is essential for ARF binding and activin regulation in vivo; Smad binding enhances but is not required for ARF binding or regulation. Smad3 can partially substitute for Smad4 in ARE regulation. |
In vitro binding assays, deletion/mutation reporter assays in Xenopus embryos |
The Journal of biological chemistry |
High |
10473623
|
| 2001 |
FoxH1-deficient mice recapitulate Nodal signaling loss phenotypes including failed anterior-posterior axis orientation and absence of the definitive node. Heterozygosity for nodal worsens FoxH1-/- phenotype, demonstrating genetic interaction between FoxH1 and nodal. FoxH1 expression in primitive endoderm rescues A-P patterning defects but not midline defects. |
Targeted gene knockout in mouse, genetic epistasis (FoxH1-/-;nodal heterozygous compound mutants), tissue-specific rescue transgene |
Genes & development |
High |
11358868
|
| 2001 |
FoxH1 deletion in mice causes failure to pattern the anterior primitive streak and form node, prechordal mesoderm, notochord, and definitive endoderm; AVE formation is FoxH1-independent. Foxa2 expression is dependent on FoxH1 function, placing FoxH1 upstream of Foxa2 in the activin/nodal-Smad pathway. |
Targeted gene knockout in mouse, in situ hybridization for Foxa2 expression, genetic pathway analysis |
Genes & development |
High |
11358869
|
| 2002 |
A conserved intronic enhancer (ASE) containing FoxH1 binding sites controls Nodal expression in epiblast and visceral endoderm. ASE activity is strictly Foxh1-dependent: removal of the ASE eliminates transcription in visceral endoderm, decreases Nodal in epiblast, disrupts AP axis orientation, reduces left-sided Nodal expression, and delays Pitx2 expression. This establishes a Nodal-FoxH1 autoregulatory feedback loop. |
Targeted deletion of intronic enhancer in mouse, reporter assays, in situ hybridization |
Development (Cambridge, England) |
High |
12091315
|
| 2002 |
Regulation of the Lim-1 (Xlim-1) gene by activin/nodal depends on a cluster of FAST-1/FoxH1 and Smad4 recognition sites in the first intron. Mutation of FAST-1/FoxH1 sites or use of dominant-negative FAST-1/FoxH1 chimeras abolishes activin-dependent reporter activity. FoxH1 sites in zebrafish lim1 first intron also mediate FoxH1-dependent regulation. |
Reporter constructs with mutated FAST-1/FoxH1 sites, dominant-negative FoxH1 chimeras, cross-species comparative analysis |
Developmental dynamics |
Medium |
12454922
|
| 2004 |
Foxh1 is essential for development of the anterior heart field (AHF): Foxh1-/- embryos fail to form the outflow tract and right ventricle. Mef2c is a direct transcriptional target of Foxh1; Foxh1 physically and functionally interacts with Nkx2-5 to mediate Smad-dependent activation of a TGF-β response element in the Mef2c gene that directs expression to the AHF. |
Mouse knockout, co-immunoprecipitation (Foxh1-Nkx2-5 interaction), reporter assays with TGF-β response element, transgenic reporter in AHF territory |
Developmental cell |
High |
15363409
|
| 2004 |
In Xenopus, maternal FoxH1 is required together with XTcf3/β-catenin to activate zygotic Xnr3 expression in a Smad2-independent manner. Maternal FoxH1 also acts as an inhibitor of Xnr5 and Xnr6 transcription, preventing their upregulation on the ventral side by the maternal T-box factor VegT. These roles are context-dependent and distinct from the ARF complex function. |
Maternal mRNA depletion (antisense), co-injection experiments with XTcf3/β-catenin, in situ hybridization for nodal gene expression |
Development (Cambridge, England) |
Medium |
15459100
|
| 2005 |
FoxH1 represses both ligand-dependent and -independent transactivation of the androgen receptor (AR) independently of its own transactivation capacity and activin A. A direct protein-protein interaction was identified between AR and FoxH1 independently of dihydrotestosterone. FoxH1 specifically blocks foci formation of dihydrotestosterone-activated AR in the nucleus; Smad2/Smad4 relieves FoxH1-mediated AR repression. |
Reporter assay (AR-responsive promoters), co-immunoprecipitation, confocal microscopy of nuclear foci |
The Journal of biological chemistry |
Medium |
16120611
|
| 2005 |
A Smad-binding peptide aptamer derived from the FoxH1 Smad-interaction motif (Trx-xFoxH1b) selectively inhibits TGF-β-induced expression from the FoxH1-Smad-dependent reporter A3-lux (~50% inhibition) and partially inhibits other TGF-β-responsive reporters. The aptamer binds Smads by GST pulldown and co-immunoprecipitation. |
GST pulldown, co-immunoprecipitation, luciferase reporter assay with seven TGF-β-responsive reporters |
Oncogene |
Medium |
15750622
|
| 2007 |
Foxh1 recruits the homeodomain protein Goosecoid (Gsc) to form a DNA-binding repressor complex; Gsc in turn recruits histone deacetylases to repress Mixl1 gene expression. Foxh1-null embryos show expanded Mixl1 expression, demonstrating Foxh1 negatively regulates Mixl1 in vivo. Gsc-mediated repression of Mixl1 is dependent on Foxh1 in embryoid bodies. |
Mouse knockout analysis, co-immunoprecipitation (Foxh1-Gsc), embryoid body overexpression, HDAC recruitment assay |
The EMBO journal |
High |
17568773
|
| 2008 |
Foxh1 directly regulates expression of members of the Aldh1a subfamily (Aldh1a1, -2, -3), Hesx1, Lgr4, Lmo1, and Fgf8 in the developing anterior neuroectoderm. In Foxh1 mutants, expression of Aldh1a1, -2, and -3 and activation of a retinoic acid-responsive reporter is abolished in anterior structures, establishing Foxh1 as a direct regulator of retinoic acid synthesis in the forebrain. |
Genome-wide SFE (Smad/Foxh1 enhancer) mapping combined with Site Search bioinformatics, in situ hybridization in Foxh1 mutants, RA-responsive transgenic reporter |
Developmental cell |
Medium |
18331719
|
| 2009 |
PKA activation increases the protein stability of FoxH1. FoxH1 inhibits PKA-induced and estradiol-induced activation of an estrogen response element (ERE). FoxH1 knockdown in MCF7 cells increases PKA-induced and estradiol-induced ERE activation, indicating FoxH1 functions as a negative regulator of ERα transcriptional activity downstream of PKA. |
Luciferase reporter assay, Western blot (protein stability), siRNA knockdown, MCF7 cell model |
Molecules and cells |
Low |
19711044
|
| 2011 |
A C-terminally truncated FoxH1 protein (midway allele) lacking the Smad-interaction domain but retaining DNA-binding capability more accurately represents complete loss of FoxH1-dependent Nodal signaling than the schmalspur allele. The T-box transcription factor Eomesodermin accounts for FoxH1-independent mesendoderm specification (endoderm and non-axial mesoderm); inhibition of Eomesodermin in midway mutants phenocopies complete loss of Nodal signaling. |
Novel zebrafish mutant characterization, gel shift assays, Nodal overexpression epistasis, genetic double mutant analysis |
PLoS genetics |
High |
21637786
|
| 2014 |
Foxh1 pre-occupies cis-regulatory modules (CRMs) genome-wide, cooperating with Smad2/3 during mesendoderm specification. ChIP-seq and RNA-seq in Foxh1 and Nodal loss-of-function Xenopus embryos identify a comprehensive set of direct Nodal target genes co-regulated by Foxh1-Smad2/3. Foxh1 also regulates gene expression independently of Nodal signaling and interacts with PouV in a conserved manner. |
ChIP-seq (Foxh1 and Smad2/3), RNA-seq on loss-of-function embryos |
Development (Cambridge, England) |
Medium |
25359723
|
| 2016 |
FoxH1 mediates a transcriptional switch at Nodal target loci via its conserved engrailed homology-1 (EH1) motif: the EH1 motif directly binds Grg4 (a Groucho corepressor), enabling repression. Upon Nodal activation, Smad2 physically displaces Grg4 from the FoxH1-Grg4 complex at the Xnr1 enhancer (shown by ChIP), switching the locus from repressed to activated state. FoxH1 unable to bind Smad2 retains Grg4 at the enhancer even in the presence of Nodal signaling. |
ChIP assays (Foxh1 and Grg4 occupancy at Xnr1 enhancer), EH1 point mutagenesis, gene expression assays, protein-protein interaction |
Developmental biology |
High |
27085753
|
| 2017 |
Foxh1 occupies cis-regulatory modules (CRMs) during cleavage stages (before Nodal signaling) and recruits the co-repressor Tle/Groucho in the early blastula. CRMs continuously occupied by Foxh1 are marked by H3K4me1 and Ep300. A molecular 'hand-off' from maternal Foxh1 to zygotic Foxa at CRMs maintains enhancer activation during mesendodermal specification. |
ChIP-seq (Foxh1, Tle/Groucho, H3K4me1, Ep300) at multiple developmental stages, genome-wide CRM analysis |
Developmental cell |
Medium |
28325473
|
| 2019 |
FOXH1 is a critical mediator of gain-of-function mutant p53 (GOF Trp53) activity in complex karyotype AML: mutant p53 binds to and regulates FOXH1, and FOXH1 binds to stem cell-associated gene loci to promote aberrant self-renewal. FOXH1 is required for GOF mutant p53-driven leukemia maintenance. |
ChIP-seq (mutant p53 and FOXH1 genome occupancy), genetic rescue/depletion in mouse leukemia model, gene expression analysis |
Cancer discovery |
Medium |
31068365
|
| 2019 |
FOXH1 functions as a pioneer factor with distinct roles for SMAD2 and SMAD3: FOXH1 is pre-bound to target sites and recruits SMAD3 independently of TGF-β signals, while SMAD2 remains predominantly cytoplasmic at baseline and is recruited to SMAD3:FOXH1-preloaded promoters upon Nodal signaling. Structural evidence shows SMAD2 can bind DNA via conformational change of the E3 insert. This defines a signal-independent priming step (SMAD3:FOXH1) and a signal-driven activation step (SMAD2:SMAD4 joining preloaded SMAD3:FOXH1). |
Crystal/structural analysis, biochemical DNA-binding assays, ChIP-seq in mouse mesendoderm precursors, subcellular fractionation |
Genes & development |
High |
31582430
|
| 2019 |
NANOG and LIN28 co-stimulate FOXH1 expression during reprogramming; FOXH1 in turn enhances epithelial marker expression and suppresses mesenchymal gene expression in OSKM-mediated reprogramming. Blocking endogenous FOXH1 eliminates the enhanced reprogramming effect by NANOG/LIN28 and DOT1L inhibition. H3K79 methyltransferase DOT1L inhibition stimulates FOXH1 expression. |
siRNA knockdown, overexpression, gene expression analysis, reprogramming efficiency assays (TRA-1-60 positivity) |
Scientific reports |
Low |
31712708
|
| 2020 |
Foxh1 pre-binding to enhancers overlaps with β-catenin association regions; direct maternal Wnt target gene expression requires Foxh1 function and Nodal/TGFβ signaling, defining a coherent feedforward co-regulation mechanism between Wnt/β-catenin and Foxh1/Nodal pathways in early embryogenesis. |
ChIP-seq (β-catenin), RNA-seq, loss-of-function (Foxh1 and Nodal pathway perturbation) |
iScience |
Medium |
32650116
|
| 2022 |
High-resolution crystal structures of FoxH1 from human, frog, and fish bound to four distinct GG/GT-containing DNA sequences reveal that FoxH1 contacts both the minor and major DNA grooves, making interactions approximately twice as extensive as other FOX family members. Two specific amino acid changes account for recognition of GG/GT motifs. FoxH1 binds nucleosomal DNA with higher affinity than linear DNA, consistent with pioneer factor activity. |
X-ray crystallography (multiple FoxH1-DNA complex structures), nucleosome-binding assay, sequence comparison/mutagenesis |
Nature communications |
High |
36435807
|
| 2022 |
Proteomic interactome analysis identifies FOXH1 interaction with PRC2 subunits and HDAC1 in mouse embryonic stem cells. Foxh1 physically interacts with Hdac1, and confers transcriptional repression of mesendodermal genes in Xenopus ectoderm. |
Proteomic pulldown (FOXH1 bait in mESCs), co-immunoprecipitation (Foxh1-Hdac1), reporter/gene expression assay in Xenopus |
Development, growth & differentiation |
Medium |
35848281
|
| 2025 |
Foxh1 directly recruits Ezh2 (the catalytic subunit of PRC2) to Foxh1-bound genomic loci during zygotic genome activation in Xenopus. Loss of maternal Foxh1 impairs Ezh2 recruitment and causes a global reduction in H3K27me3. Foxh1 thus has a dual function: activating endodermal genes in endoderm while recruiting PRC2 to silence those same genes in ectoderm. |
Maternal Foxh1-null embryos, ChIP-seq (Ezh2 and H3K27me3), co-immunoprecipitation |
bioRxivpreprint |
Medium |
41040321
|