| 1997 |
TTF-2 (FOXE1) is a forkhead domain-containing transcription factor that binds to sites on both thyroglobulin (Tg) and thyroperoxidase (TPO) promoters. Its expression is transient in the developing thyroid and is down-regulated just before the onset of Tg and TPO gene expression, suggesting it acts as a negative controller of thyroid-specific gene expression during development. |
cDNA cloning, DNA binding assays, expression analysis by in situ hybridization in mouse embryos |
The EMBO journal |
High |
9214635
|
| 1997 |
TTF-2 (FOXE1) mRNA levels are under transcriptional control by TSH (via cAMP), insulin, and IGF-I in FRTL-5 thyroid cells. TSH and insulin effects are additive, require ongoing protein synthesis, and increase TTF-2 transcription rates as demonstrated by run-off assays. |
Northern blot, nuclear run-off transcription assays, dose-response experiments in FRTL-5 thyroid cells |
The Journal of biological chemistry |
High |
9287345
|
| 1998 |
A homozygous missense mutation (Ala65Val) within the FOXE1 forkhead domain causes thyroid agenesis, cleft palate, and choanal atresia. The mutant protein exhibits impaired DNA binding and loss of transcriptional function. |
Patient sequencing, in vitro DNA binding assays, transcriptional reporter assays with mutant protein |
Nature genetics |
High |
9697705
|
| 1999 |
TTF-2 (FOXE1) physically interacts with CTF/NF-1 proteins (specifically CTF/NF1-C, which is itself TSH-, cAMP-, and insulin-inducible) via GST pull-down. This interaction enhances hormone-induced TPO gene expression; spacing between the two transcription factor binding sites is critical for promoter activity and hormonal response. |
GST pull-down assays, transfection experiments, protein-DNA interaction studies, spacing mutagenesis of TPO promoter |
The Journal of biological chemistry |
High |
10329730
|
| 2000 |
TTF-2 (FOXE1) acts as a promoter-specific transcriptional repressor of TTF-1 and Pax-8 activity through a DNA-binding-independent mechanism. The minimal repressor domain was identified as an independent functional domain that interferes with a specific cofactor required for TTF-1 and Pax-8 activity. |
Transcriptional reporter assays, deletion mutagenesis to map repressor domain, co-transfection experiments |
Biochemical and biophysical research communications |
Medium |
10944465
|
| 2002 |
A second homozygous missense mutation in TTF-2/FOXE1 (Ser57Asn in the forkhead DNA binding domain) causes congenital hypothyroidism, athyreosis, and cleft palate. The S57N mutant protein shows impaired DNA binding and partial loss of transcriptional function, correlating with a less severe phenotype than the A65V mutation. |
Patient sequencing, in vitro DNA binding assays, transcriptional reporter assays |
Human molecular genetics |
High |
12165566
|
| 2002 |
TTF-2/FOXE1 protein is phosphorylated in vivo and is expressed in multiple endoderm-derived structures during mouse embryogenesis (tongue, palate, epiglottis, pharynx, oesophagus, choanae) and ectodermal structures (whiskers), consistent with the full phenotypic spectrum of Bamforth syndrome. |
Detailed immunohistochemistry of mouse embryos at multiple developmental stages, phosphorylation detection |
Developmental dynamics |
Medium |
12203737
|
| 2004 |
FOXE1 is a direct transcriptional target of GLI2 in the Sonic Hedgehog signaling pathway in human epidermis. A 2.5 kb upstream fragment containing five GLI-binding sites activates FOXE1 transcription in a reporter assay, with induction kinetics similar to the known direct GLI2 target PTCH. |
Reporter assays with GLI-binding site-containing FOXE1 upstream fragment, in situ hybridization, kinetic expression analysis |
The Journal of investigative dermatology |
Medium |
15140221
|
| 2004 |
Foxe1 is required for hair follicle morphogenesis downstream of the Shh/Gli pathway. In Foxe1-null mice, hair follicles are disoriented and misaligned. Dominant-negative Gli2 suppresses Foxe1 expression in hair follicles, and transcriptionally active Gli2 stimulates the Foxe1 promoter. |
Foxe1-null mouse analysis, dominant-negative Gli2 transgenic mice, Foxe1 promoter reporter assays, immunohistochemistry, lineage marker expression analysis |
Human molecular genetics |
High |
15367491
|
| 2006 |
A third homozygous missense mutation in FOXE1 (R102C, within the forkhead DNA binding domain) causes loss of DNA binding and transcriptional inactivity but does not prevent thyroid tissue formation, indicating that human thyroid development can occur despite loss of TTF-2/FOXE1 function. |
Patient sequencing, in vitro DNA binding assay, transcriptional reporter assays |
The Journal of clinical endocrinology and metabolism |
High |
16882747
|
| 2007 |
FoxE1 acts as a pioneer transcription factor: it binds to the compacted chromatin of the inactive TPO promoter upon hormone induction, creates a local exposed chromatin domain on H1-compacted nucleosome arrays even when its binding site is nucleosome-protected, and enables NF-1 to bind simultaneously with an additive effect on chromatin remodeling. |
Chromatin DNase I hypersensitivity assay in thyroid cells, in vitro nucleosome binding assays, in vitro H1-compacted chromatin assays, cotransfection/binding with NF-1 |
Molecular and cellular biology |
High |
17709379
|
| 2007 |
The FOXE1 polyalanine tract length modulates transcriptional activity: constructs with 16 alanines show 1.55-fold higher transcriptional activity than those with 14 alanines, while nuclear localization is not affected. The 16/16 genotype is associated with protection against thyroid dysgenesis. |
Transcriptional reporter assays with FOXE1 constructs containing 14 or 16 alanines, nuclear localization assessment, case-control and TDT association study |
Human genetics |
Medium |
17717707
|
| 2009 |
The FOXE1 5' UTR variant rs1867277 (NM_004473.3:c.-283G>A) differentially recruits transcription factors: the A allele exclusively recruits USF1/USF2, while both alleles form a complex with DREAM/CREB/αCREM. Transfection studies show allele-dependent transcriptional regulation of FOXE1. |
DNA-binding (EMSA) assays, transfection reporter assays, candidate gene association study in Spanish and Italian cohorts |
PLoS genetics |
High |
19730683
|
| 2009 |
In non-syndromic cleft palate patients, a C→G polymorphism in the 5'-UTR of FOXE1 falls within a MYF-5 consensus binding motif and abolishes MYF-5 binding (demonstrated by EMSA), resulting in significantly reduced FOXE1 mRNA expression. |
DNA sequencing, EMSA/band-shift assays, oligonucleotide competition, real-time PCR |
Journal of oral pathology & medicine |
Medium |
19192046
|
| 2009 |
In zebrafish, foxe1 loss-of-function (morpholino knockdown) causes abnormal craniofacial development with shortening of Meckel's cartilage and ceratohyals, suppressed chondrocytic proliferation, and reduced expression of sox9a, colIIa1, and runx2b at 2 dpf, while upregulating fgfr2 in branchial arches. Neural crest migration and pharyngeal arch specification are unaffected. |
Morpholino antisense knockdown in zebrafish, in situ hybridization for marker genes, cartilage staining |
Journal of experimental zoology. Part B |
Medium |
19488987
|
| 2010 |
FOXE1 directly transactivates MSX1 and TGF-β3 promoters by binding to specific motifs, as demonstrated by ChIP and promoter reporter assays. Forkhead-domain mutations (but not polyalanine stretch polymorphisms) abolish this activity. In Foxe1-null mouse embryos (E14), Tgf-β3 and Msx1 mRNAs are nearly absent in palatal shelves, establishing these as direct FOXE1 targets required for palatogenesis. |
Chromatin immunoprecipitation (ChIP), promoter reporter (transactivation) assays, Foxe1-null mouse embryo analysis by RT-PCR, mutagenesis of forkhead domain |
Human molecular genetics |
High |
21177256
|
| 2010 |
A fourth homozygous FOXE1 missense mutation (F137S, caused by maternal isodisomy of chromosome 9) abolishes DNA binding and transcriptional activity as predicted by structural modeling and confirmed by transfection assays. |
Sequencing, microsatellite marker analysis, MLPA, structural modeling, transfection transcriptional assays |
The Journal of clinical endocrinology and metabolism |
Medium |
20484477
|
| 2012 |
FOXE1 polyalanine tract length affects transcriptional function: in vitro studies show FOXE1(16Ala) is transcriptionally impaired compared to FOXE1(14Ala), without differences in protein expression or DNA binding, suggesting the alanine tract modulates a step after DNA binding (e.g., cofactor interaction or transactivation). |
In vitro transcriptional reporter assays, protein expression analysis, DNA binding assays comparing different polyalanine tract length variants |
The Journal of clinical endocrinology and metabolism |
Medium |
22736773
|
| 2013 |
FoxE1 directly binds the NIS (Nis) upstream enhancer and the Duox2 regulatory region in thyroid cells (demonstrated by ChIP), with simultaneous binding of FoxE1 and NF1/CTF to the Nis enhancer having an additive functional effect on Nis promoter activation. Genome-wide expression screening after FoxE1 knockdown identified multiple regulated targets including Adamts9, Cdh1, Duox2, S100a4 (upregulated) and Casp4, Creld2, Dusp5, Etv5, Hsp5a, Nr4a2, Tm4sf1 (downregulated). |
Genome-wide expression screening after FoxE1 knockdown, ChIP assay, in silico promoter analysis, luciferase reporter assays |
PloS one |
High |
23675434
|
| 2014 |
Methylation of two consecutive CpG dinucleotides (CpG14 and CpG15) in the FOXE1 promoter (-1600 to -1140 from TSS) is significantly higher in leukocytes than in thyroid tissue, and this methylation reduces FOXE1 promoter activity in luciferase assays. Preventing methylation of these sites by mutation restores promoter activity. |
Genome-wide methylation array, bisulfite sequencing, luciferase reporter assays with methylated and unmethylated FOXE1 promoter constructs, site-directed mutagenesis of CpG sites |
The Journal of clinical endocrinology and metabolism |
High |
24646064
|
| 2015 |
A non-coding SNP (rs7850258) within a -67.7 kb FOXE1 enhancer element active in oral epithelium and developing thyroid alters enhancer activity in an allele-dependent manner: the G allele (associated with CLP and hypothyroidism) has significantly greater enhancer activity than the A allele (associated with thyroid cancer). The element is more responsive to MYC and ARNT with the G allele, as predicted by transcription factor binding differences. |
Zebrafish and mouse transgenesis to identify enhancers, quantitative reporter assays in oral epithelial and thyroid cell lines comparing both alleles, transcription factor binding prediction |
Human molecular genetics |
High |
25652407
|
| 2015 |
FOXE1 somatic mutations in papillary thyroid cancer (P54Q, K95Q, L112F in PTC; G140R in MNG) within the forkhead domain result in marked impairment of transcriptional activation without affecting protein expression, as demonstrated by in vitro functional assays and molecular modeling. |
Sequencing of 120 PTC and 110 MNG samples, in vitro transcriptional activation assays, FOXE1 forkhead domain structural modeling |
Thyroid |
Medium |
25950909
|
| 2015 |
FOXE1 germline variant p.A248G promotes cell proliferation and migration in rat normal thyroid cells (PCCL3) and human PTC cell line (TPC-1), suggesting a gain-of-function or altered function in thyroid tumorigenesis. |
Stable expression of wild-type and p.A248G mutant FOXE1 in thyroid cell lines, proliferation and migration assays |
Endocrine |
Low |
25381600
|
| 2015 |
FOXE1 expression is regulated by TSH/cAMP via CREB and CREM binding to CRE sites in the Foxe1 promoter, and by TGF-β via SMAD proteins that inhibit TSH-induced Foxe1 expression. Foxe1 is also regulated by Nkx2-1, Pax8, and by itself (autoregulation), establishing a complex transcriptional network for Foxe1 control in thyroid follicular cells. |
Promoter cloning, site-directed mutagenesis of CRE and SMAD binding sites, protein/DNA binding assays, siRNA gene silencing of CREB/CREM/Smad/Nkx2-1/Pax8, reporter assays in PCCl3 thyroid cells |
Thyroid |
High |
30652527
|
| 2015 |
Nitric oxide (NO) inhibits TSH-stimulated TPO expression by repressing FoxE1 expression through a cGMP-dependent protein kinase-mediated pathway. The FoxE1 binding site Z in the TPO promoter mediates the NO-inhibited TPO expression. |
NO donor treatment of FRTL-5 thyroid cells, cGMP-PKG pathway inhibitor studies, promoter binding site mutation analysis, FoxE1 expression measurement |
Molecular and cellular endocrinology |
Medium |
26610751
|
| 2016 |
FOXE1 physically interacts with ELK1 (identified in a transcription factor binding array, confirmed by co-immunoprecipitation and mammalian two-hybrid assay). In thyroid tissue, endogenous FOXE1 and ELK1 bind the TERT and TPO promoters in close proximity (ChIP assay). FOXE1 positively regulates TERT expression in a manner dependent on its association with ELK1; MEK inhibition (U0126) disrupts the FOXE1-ELK1 interaction and reduces TERT and TPO promoter activity. |
Transcription factor binding array, co-immunoprecipitation, mammalian two-hybrid assay, ChIP in human thyroid tissue, EMSA, TERT promoter reporter assays, siRNA silencing, MEK inhibitor treatment |
Oncotarget |
High |
27852061
|
| 2016 |
Foxe1 overexpression in mouse thyroid (under thyroglobulin promoter) causes early severe hypothyroidism and thyroid hypoplasia, then multinodular goiter with macrofollicular-papilloid benign nodules in adult mice. Combined with radiation or Pten haploinsufficiency, Foxe1 overexpression promotes hyperplastic but not malignant nodule formation, indicating proper Foxe1 dosage is essential for normal thyroid structure and function. |
Transgenic mouse model (Tg-Foxe1), thyroid hormone measurement, histological analysis, radiation exposure experiments, crossing with Pten+/- mice |
Endocrinology |
High |
26982637
|
| 2017 |
PTCSC2 lncRNA binds MYH9 (myosin-9) protein. In a bidirectional promoter shared by FOXE1 and PTCSC2, MYH9 inhibits promoter activity in both directions; PTCSC2 reverses this inhibition. RNA knockdown of FOXE1 in primary thyroid cells profoundly interferes with the p53 pathway. |
RNA pull-down/binding assay (PTCSC2-MYH9 interaction), bidirectional promoter reporter assays, siRNA knockdown of FOXE1 with pathway gene expression analysis |
Proceedings of the National Academy of Sciences |
Medium |
28049826
|
| 2019 |
FOXE1 directly binds the HK2 promoter and negatively regulates HK2 transcription, thereby suppressing the Warburg effect (aerobic glycolysis) in colorectal cancer cells. Silencing FOXE1 enhances glucose consumption and lactate production, while enforced FOXE1 expression has opposite effects. |
ChIP assay showing FOXE1 binding to HK2 promoter, luciferase reporter assays, FOXE1 knockdown/overexpression with metabolic measurements, in vivo xenograft |
Cell communication and signaling |
Medium |
31918722
|
| 2020 |
FOXE1 directly interacts with the ZEB1 promoter (confirmed by ChIP) and positively regulates ZEB1 transcriptional activity. Loss of FOXE1 decreases ZEB1 expression, while FOXE1 overexpression increases ZEB1 activity. ZEB1 silencing reduces thyroid tumor cell migration and invasion, placing FOXE1 upstream of ZEB1 in an EMT regulatory pathway. |
ChIP assay, gain-of-function and loss-of-function experiments, ZEB1 reporter assays, migration/invasion assays, siRNA silencing of ZEB1 and FOXE1 |
Endocrine-related cancer |
Medium |
31846430
|
| 2020 |
Reducing FOXE1 gene dosage (FOXE1+/- background) in a BRAFV600E-inducible thyroid cancer mouse model changes cancer histology: FOXE1+/+ cancers resemble high-grade papillary thyroid carcinomas while FOXE1+/- cancers are morphologically less malignant but more severely undifferentiated, with reduced proliferation and increased apoptosis. FOXE1 dosage thus exerts pleiotropic effects on thyroid cancer histology and differentiation markers. |
Genetic epistasis in compound transgenic mouse model, histological analysis, proliferation index (Ki67), apoptosis assay, immunohistochemistry for differentiation markers |
International journal of molecular sciences |
Medium |
33375029
|
| 2021 |
FOXE1 expression in thyroid cells (that do not endogenously express FOXE1) upregulates multiple chemokines involved in macrophage recruitment. FOXE1-expressing cells induce chemotaxis of co-cultured monocytes. In a mouse thyroid cancer model, FOXE1 dosage directly correlates with expression of the same chemokine set, and pro-tumorigenic M2 macrophage infiltration is decreased in tumors with reduced FOXE1. |
Transcriptome analysis (RNA-seq) after FOXE1 expression in FOXE1-negative cells, monocyte chemotaxis co-culture assay, in vivo mouse cancer model with FOXE1+/- background, immunohistochemistry for macrophage markers |
International journal of molecular sciences |
Medium |
34299284
|
| 2022 |
Tamoxifen-inducible ubiquitous deletion of Foxe1 in adult mice causes disrupted thyroid follicular architecture, elevated TSH, reduced T4, decreased Tpo and Tg expression, and an unexpected increase in thyroidal mast cells (marked by Mcpt4 and Ctsg), confirming Foxe1's role in maintenance of thyroid differentiation in adults. |
Conditional knockout mouse model (Cre-lox/tamoxifen inducible), hormone measurements, histology, immunohistochemistry, microarray and RNA-seq transcriptomics, RT-qPCR validation |
Endocrinology |
High |
36156081
|
| 2023 |
FOXE1 promotes keratinocyte proliferation by facilitating G1/S transition and activating ERK1/2 signaling, and upregulates the production of IL-1β, IL-6, and TNF-α. RNA-seq identifies WNT5A as a downstream effector; WNT5A knockdown inhibits FOXE1-driven keratinocyte proliferation and cytokine production. In vivo, FOXE1 depletion by shRNA or genetic deletion ameliorates imiquimod-induced psoriasis-like dermatitis. |
Knockdown and overexpression of FOXE1 in keratinocytes, RNA-seq, cell cycle analysis, ERK1/2 phosphorylation assay, WNT5A siRNA rescue experiment, imiquimod mouse model with lentiviral shRNA or genetic FOXE1 deletion |
The Journal of investigative dermatology |
Medium |
37394057
|
| 2011 |
HR (Hairless) transcriptional cofactor suppresses Foxe1 mRNA expression in skin; Foxe1 downregulation in turn reduces Msx1 expression in hair follicles, placing HR upstream of Foxe1 and Msx1 in a hair follicle regulatory cascade. Sfrp1 expression also correlates with Foxe1 levels. |
Expression analysis in HR-overexpressing mouse skin and keratinocytes, correlation of Foxe1 and downstream target gene expression |
BMB reports |
Low |
21777520
|