| 1995 |
Otx2 is essential for formation of all structures anterior to rhombomere 3; homozygous knockout mice fail to develop the rostral head, demonstrating Otx2 functions as a gap-like gene in the Hox-free rostral head region. Heterozygous loss causes craniofacial malformations (otocephaly) in regions where Otx1 is not co-expressed. |
Targeted gene knockout in mouse (homozygous and heterozygous mutant phenotypic analysis) |
Genes & development |
High |
7590242
|
| 1994 |
Anterior mesendoderm provides a positive signal required to stabilize Otx2 expression in ectoderm, while posterior mesendoderm provides a negative (repressive) signal; exogenous retinoic acid can mimic the posterior repressive signal and reduce the anterior Otx2 domain. |
Explant-recombination assays in mouse embryos; retinoic acid treatment |
Development (Cambridge, England) |
High |
7607086
|
| 1999 |
The caudal limit of Otx2 expression is sufficient to position the isthmic organizer and specify midbrain versus hindbrain fate; ectopic Otx2 expression in the presumptive anterior hindbrain (via En1 locus knock-in) shifts the isthmic organizer markers (Pax2, Fgf8, Wnt1, Gbx2) caudally and causes loss of anterior cerebellar vermis with complementary enlargement of inferior colliculus. |
Knock-in strategy into En1 locus to ectopically express Otx2; histological and molecular marker analysis |
Nature |
High |
10490025
|
| 1999 |
FGF8 represses Otx2 expression in the chick neuroepithelium, and a negative feedback loop between Fgf8 and Otx2 plays a key role in patterning the midbrain and anterior hindbrain; FGF8-bead implantation induces an ectopic isthmic organizer by repressing Otx2 and inducing En1, Fgf8, and Wnt1. |
FGF8-bead implantation in chick embryos; in situ hybridization for molecular markers |
Development (Cambridge, England) |
High |
10021338
|
| 2000 |
Otx2 and Gbx2 mutually repress each other's expression at the midbrain-hindbrain boundary; ectopic Otx2 in chick metencephalon transforms it into optic tectum, ectopic Gbx2 in mesencephalon shifts the tectum's caudal limit rostrally, and both repress endogenous Fgf8 while inducing Fgf8 at their new expression interface. |
In ovo electroporation gain-of-function in chick embryos; expression analysis of isthmic/tectum markers |
Mechanisms of development |
High |
10704829
|
| 2001 |
Otx2 is required in the anterior visceral endoderm for anteriorly directed morphogenetic movement and for expression of secreted antagonists of Nodal (Lefty1) and Wnt (Dkk1) signals; Otx2 mutants show failure of anterior visceral endoderm migration and ectopic primitive streak marker expression in the epiblast. |
Lineage tracing combined with molecular marker analysis in Otx2 mutant mouse embryos |
Development (Cambridge, England) |
High |
11171400
|
| 1997 |
Otx2 directly activates the cement gland differentiation marker XCG (in the absence of protein synthesis, indicating direct target activation) and also autoregulates its own expression; retinoic acid blocks Otx2 autoactivation, explaining how RA reduces the anterior Otx2 domain. |
Dexamethasone-inducible Otx2-GR fusion protein; cycloheximide block experiments; reporter assays in Xenopus |
Development (Cambridge, England) |
High |
9053323
|
| 2000 |
OTX2 directly binds LIM1 (via its C-terminal region to the LIM1 homeodomain) and HNF-3β (via both homeodomain and C-terminal regions); LIM1 enhances OTX2-directed transcription while HNF-3β represses it at a P3C binding sequence. |
Co-immunoprecipitation; deletion mutagenesis; luciferase transactivation assay |
Biochemical and biophysical research communications |
Medium |
10623575
|
| 1999 |
The divergent phenotypes of Otx1-/- and Otx2-/- mice largely reflect differences in expression patterns rather than coding sequence; human OTX2 cDNA knocked into the Otx1 locus rescues epilepsy, corticogenesis, and most other Otx1-/- defects, demonstrating extended functional homology between OTX1 and OTX2 proteins. |
Knock-in replacement of Otx1 coding sequence with human OTX2 cDNA; phenotypic rescue analysis |
Development (Cambridge, England) |
High |
10068635
|
| 2000 |
OTX2 binds a bicoid-related Otx target sequence in the GnRH proximal promoter using baculovirus-expressed OTX2 and nuclear extracts from GT1-7 cells; Otx2 overexpression induces GnRH promoter activity in GT1-7 neurons in an Otx binding site-dependent manner, and OTX2 protein is present in adult GnRH neurons. |
Electrophoretic mobility shift assay (EMSA); transient transfection/luciferase reporter assay; immunohistochemistry |
Molecular endocrinology (Baltimore, Md.) |
Medium |
10935548
|
| 1997 |
Human OTX2 homeodomain protein binds with high affinity to a target sequence (OTS) in the human tenascin-C promoter and trans-represses its transcriptional activity in transiently transfected cells. |
EMSA with recombinant protein; transient transfection reporter assay |
DNA and cell biology |
Medium |
9174161
|
| 1999 |
OTX2 binding to its DNA target (OTS) recruits a second OTX2 molecule to the complex cooperatively; the C-terminal region carboxyl to the homeodomain is required in addition to the homeodomain for DNA binding; OTX2 dimerization requires the same protein domains as DNA binding. |
EMSA with full-length recombinant OTX2 and deletion mutants |
FEBS letters |
Medium |
10069392
|
| 2004 |
Otx2 regulates identity and fate of ventral midbrain neuronal progenitors by repressing Nkx2.2 and maintaining the Nkx6.1-expressing domain through dorsal antagonism on Shh; loss of Otx2 causes dopaminergic neurons to be greatly reduced, red nucleus precursors to disappear, and serotonergic neurons to be generated in the ventral midbrain. |
Conditional Cre-mediated Otx2 inactivation under En1 transcriptional control; molecular marker analysis in mouse |
Development (Cambridge, England) |
High |
15105370
|
| 2005 |
Otx2 controls neuronal subtype identity and neurogenesis in the midbrain independently of its role in positioning the mid-hindbrain organizer; loss of Otx2 in neuronal progenitors from E10.5 leads to ectopic Math1 expression and cerebellar-like structure in dorsal midbrain, ectopic Nkx2.2 and serotonergic neurons ventrally, and hypoplasia of the red nucleus and dopaminergic neurons. |
Conditional Nestin-Cre/Otx2(flox/flox) knockout mice; molecular marker and histological analysis |
The Journal of neuroscience |
High |
15888661
|
| 2006 |
Otx2 is cell-autonomously required in glutamatergic dorsal thalamus progenitors to repress GABAergic differentiation by repressing Mash1 in Ngn2-expressing progenitors; Otx2 ablation also activates Pax3, Pax7, and Lim1, markers of pretectal GABAergic identity, and causes hyperproliferation. |
Conditional Otx2 ablation in thalamus; in situ hybridization and molecular marker analysis in mouse |
The Journal of neuroscience |
High |
16738237
|
| 2006 |
Gbx2 and Otx2 both interact physically with the WD40 domain of Groucho/Tle corepressor proteins via engrailed homology region 1 (eh1)-like motifs; Groucho is required for Gbx2-mediated repression of Otx2 and for Otx2-mediated repression of Fgf8 at the MHB in medaka embryos. |
Cell culture colocalization; co-immunoprecipitation; heat shock-induced expression of wild-type and mutant proteins in medaka embryos |
Molecular and cellular biology |
High |
17060451
|
| 2006 |
Molecular characterization of OTX2 identifies: transactivation domains in both N- and C-termini; DNA binding residing in the minimal homeodomain with critical residues identified; a nuclear localization sequence within the homeodomain; a novel nuclear retention domain in the central protein region; and a dominant negative activity in the central region. Human disease mutations show decreased transactivation activity rather than dominant negative effect. |
Deletion and point mutant analysis; transactivation assay; DNA binding assay; subcellular localization analysis in transfected cells |
Journal of molecular medicine (Berlin, Germany) |
High |
16607563
|
| 2008 |
Otx2 and Sox2 proteins physically interact with each other and both bind to the conserved noncoding sequence CNS1 ~2 kb upstream of the Rax promoter; Otx2 and Sox2 synergistically activate Rax transcription via CNS1; ocular malformation-associated Sox2 missense mutations disrupt the Sox2-Otx2 interaction. |
ChIP with endogenous proteins; reporter/luciferase assay; co-immunoprecipitation; mutagenesis in Xenopus |
Proceedings of the National Academy of Sciences of the United States of America |
High |
18385377
|
| 2007 |
Otx2 acts as a competence factor for lens specification by binding to the major FoxE3 enhancer (Lens1) together with Su(H) (the Notch signaling nuclear transducer); both inputs are obligately required for FoxE3 activation in the presumptive lens ectoderm. |
In vivo and in vitro binding assays; deletion/mutation analysis of enhancer; inhibition of Notch ligand Delta2; ectopic Notch activation in Xenopus |
Development (Cambridge, England) |
High |
18057103
|
| 2009 |
Wnt/β-catenin signaling directly regulates Otx2 expression in the developing RPE; β-catenin binds near TCF/LEF sites in the Otx2 enhancer as shown by ChIP and luciferase assays; RPE-specific β-catenin deletion causes downregulation of Otx2 and Mitf and transdifferentiation of RPE into retina. |
Cre-mediated conditional RPE-specific β-catenin knockout; ChIP; luciferase enhancer assay; immunohistochemistry |
Development (Cambridge, England) |
High |
19553286
|
| 2010 |
Otx2 controls neuron subtype identity in the VTA by antagonizing Girk2 and Dat expression; Otx2 is restricted to VTA neurons complementary to those with high Dat and Girk2; Otx2 loss expands the dorsal-lateral VTA identity, while ectopic Otx2 in substantia nigra suppresses Dat expression and confers MPTP resistance. |
Loss-of-function and gain-of-function mouse models; molecular marker analysis; MPTP neurotoxin challenge |
Nature neuroscience |
High |
21057506
|
| 2010 |
Conditional adult Otx2 ablation causes slow photoreceptor degeneration and rapid RPE dysfunction; RPE-specific Otx2 deletion alone recapitulates photoreceptor degeneration, while constitutive Otx2 expression restricted to RPE prevents degeneration, establishing that Otx2 maintains photoreceptors non-cell-autonomously through RPE function. |
Conditional self-knockout (CreERT2/flox strategy); electroretinography; gene expression analysis; RPE-specific rescue experiment |
PloS one |
High |
20657788
|
| 2011 |
OTX2 directly binds to cell cycle gene promoters (identified by ChIP-on-chip) and activates their expression in medulloblastoma cells; silencing OTX2 inhibits proliferation and induces neuronal differentiation, with downregulation of cell cycle and visual perception genes and upregulation of differentiation genes. |
Inducible shRNA knockdown; expression profiling; ChIP-on-chip in D425 medulloblastoma cells |
International journal of cancer |
High |
21964830
|
| 2005 |
OTX2 is amplified and overexpressed in medulloblastoma; siRNA-mediated OTX2 knockdown inhibits medulloblastoma cell growth in vitro; pharmacological all-trans retinoic acid represses OTX2 expression and induces apoptosis specifically in OTX2-expressing medulloblastoma cell lines. |
siRNA knockdown; digital karyotyping; gene expression analysis; pharmacological treatment (ATRA) |
Cancer research |
Medium |
15705891
|
| 2009 |
OTX2 ectopic expression enhances proliferation and tumorigenicity of immortalized primary cells; OTX2 knockdown in medulloblastoma cells prolongs survival in xenograft tumor models; MYC upregulation is identified as a potential mechanism by which OTX2 promotes tumor progression. |
Ectopic OTX2 expression; shRNA knockdown; orthotopic xenograft mouse model; expression analysis |
Cancer research |
Medium |
20028867
|
| 2012 |
OTX2 binds to the MyoD1 core enhancer through its homeobox domain and represses myogenic and neuronal differentiation in medulloblastoma cells; the homeobox domain exhibits strong repressor activity; OTX2 attenuation triggers myogenic and neuronal differentiation in vitro and prolongs survival in an orthotopic mouse model. |
ChIP; DNA binding assay; RNAi knockdown; in vitro differentiation assay; orthotopic mouse model |
Cancer research |
High |
22986744
|
| 2012 |
OTX2 silencing in medulloblastoma causes downregulation of polycomb genes (EZH2, EED, SUZ12, RBBP4) and upregulation of H3K27 demethylases, resulting in decreased H3K27me3 particularly at OTX2-bound promoters; OTX2-bound promoters exhibit a bivalent-like state with high H3K4me3/H3K9ac and intermediate H3K27me3 that is maintained by OTX2. |
Inducible OTX2 shRNA; ChIP for histone marks; gene expression analysis in D425 cells |
Acta neuropathologica |
Medium |
23179372
|
| 2013 |
Loss of Otx2 in the adult mouse RPE (by RPE-specific conditional ablation) disrupts four RPE-specific functions identified by ChIP-seq, leading to photoreceptor degeneration; ChIP-seq identifies the in vivo Otx2 target gene network in RPE cells; many direct Otx2 RPE targets are associated with human retinopathies. |
RPE-specific conditional Otx2 KO; electroretinography; ChIP-seq; gene expression analysis |
The Journal of neuroscience |
High |
23761884
|
| 2013 |
Otx2 is essential for choroid plexus (ChP) development and maintenance; Otx2 deletion at E9 eliminates all ChPs; Otx2 deletion at E15 in hindbrain ChP causes apoptosis and reduced size; Otx2 controls CSF composition including Wnt4 and Tgm2 levels, thereby influencing Wnt signaling and proliferation in the distant cerebral cortex. |
Conditional Otx2 deletion using Otx2-CreERT2 and Gdf7-Cre driver lines; histological, apoptosis, and gene expression analysis |
Development (Cambridge, England) |
High |
23364326
|
| 2014 |
Otx2 drives enhancer activation during exit from ground state pluripotency by affecting chromatin marks; Oct4 is required for Otx2 expression, and reciprocally Otx2 is required for efficient Oct4 recruitment to many enhancer regions, establishing an Oct4-Otx2 regulatory axis. |
ChIP-seq for Otx2, Oct4, and histone marks in mouse ESCs; genetic knockdown/KO; gene expression analysis |
Cell reports |
High |
24931607
|
| 2014 |
Sox6 and Otx2 define complementary dopamine neuron subpopulations: Sox6 is selective for SNc neurons while Otx2 and Nolz1 mark VTA neurons; Sox6 ablation decreases SNc markers and increases VTA markers while Otx2 ablation has the opposite effect, demonstrating mutual antagonism in subtype specification. |
Conditional knockout of Sox6 and Otx2; molecular marker and electrophysiological analysis; dopamine measurement |
Cell reports |
High |
25127144
|
| 2014 |
OTX2 directly activates Dkk1 expression in the anterior mesendoderm by interacting with the Dkk1 H1 regulatory region; OTX2 binds two conserved regions in the Lhx1 locus to activate Lhx1 expression; compound Otx2;Lhx1 and Otx2;Dkk1 mutants show severely abnormal head development. |
Tissue-specific conditional Otx2 ablation in AME; ChIP-qPCR; luciferase assay; RT-qPCR; compound mutant analysis |
Development (Cambridge, England) |
High |
25231759
|
| 2014 |
ChIP-seq in Xenopus tropicalis gastrulae reveals Otx2 occupies tissue-specific cis-regulatory modules (CRMs) together with TLE/Groucho corepressor; two distinct CRM types mediate activation or repression of target genes depending on whether partner TFs (e.g., Lim1/Lhx1 activator or Goosecoid repressor) are present. |
ChIP-seq for Otx2 and TLE in Xenopus gastrulae; RNA-seq; CRM profiling |
Nature communications |
High |
25005894
|
| 2014 |
Otx2 ChIP-seq in the mature mouse retina shows Otx2 occupies different genomic functional domains in RPE versus neural retina cells, regulating mostly different gene sets; in neural retina, Otx2 genome occupancy largely overlaps with the related transcription factor Crx, consistent with functional redundancy in that compartment. |
ChIP-seq for Otx2 in RPE and neural retina; comparison with Crx ChIP-seq data |
PloS one |
High |
24558479
|
| 2007 |
Acetylated YY1 binds to both the Otx2 anterior neuroectoderm (AN) enhancer (92 kb upstream) and the promoter region; only acetylated YY1 binds the enhancer sequence; YY1 binding to both sites is required for Otx2 expression in anterior neuroectoderm, and this regulatory mechanism is evolutionarily conserved. |
Chromatin immunoprecipitation; transgenic reporter assay; enhancer mutant mice (Otx2ΔAN/-); conservation analysis |
The EMBO journal |
High |
17332747
|
| 2010 |
SOX9 physically interacts with MITF and OTX2 and, together with them, synergistically activates the BEST1 promoter through a paired SOX site; ChIP on fresh RPE cells confirms SOX9 binding to the BEST1 region. |
Co-immunoprecipitation; ChIP; siRNA knockdown; luciferase reporter assay; yeast one-hybrid screen |
The Journal of biological chemistry |
Medium |
20530484
|
| 2000 |
Otx2 protein shows cell-type-specific subcellular localization in the postnatal retina: nuclear in RPE and bipolar cells, but cytoplasmic in rod photoreceptors; cytoplasmic retention in immature rods is developmentally regulated, as shown in retinal explants and transfected cell lines. |
Immunohistochemistry; retinal explant culture; cell line transfection; subcellular fractionation |
Brain research. Molecular brain research |
Medium |
10891582
|
| 2011 |
Deletion of Otx2 specifically in GnRH neurons causes a significant decrease in hypothalamic GnRH neurons, delayed pubertal onset, abnormal estrous cyclicity, and infertility, providing in vivo evidence that Otx2 is required for GnRH expression and reproductive competence. |
GnRH neuron-specific Otx2 conditional knockout; neuron counting; reproductive phenotype analysis |
Molecular endocrinology (Baltimore, Md.) |
High |
21436260
|
| 2015 |
In iPSC-derived 3D organoids modeling congenital pituitary hypoplasia, OTX2 in the hypothalamus (not in oral ectoderm) is required for pituitary progenitor cell maintenance by regulating LHX3 expression in oral ectoderm via FGF10 in the hypothalamus; haploinsufficiency of OTX2 impairs pituitary hormone-producing cell differentiation. |
Patient-derived iPSCs; 3D organoid differentiation; mutation correction; gene expression analysis |
The Journal of clinical investigation |
High |
31845906
|
| 2014 |
Otx2 deletion in pituitary neural ectoderm abolishes FGF signaling and causes severe hypoplasia of the posterior pituitary lobe and stalk; lack of FGF signaling from the neural ectoderm also impairs anterior lobe growth (but not cell differentiation), demonstrating both cell-intrinsic and extrinsic roles of Otx2 in pituitary development. |
Multiple Cre driver lines for tissue-specific Otx2 deletion; histological and gene expression analysis |
Human molecular genetics |
Medium |
25315894
|
| 2019 |
Non-cell autonomous OTX2 homeoprotein transferred into the visual cortex directly regulates Gadd45b/g transcription, inducing their expression in juvenile mice; in adults, reducing cortical OTX2 increases Gadd45b/g expression. Viral Gadd45b expression in adult visual cortex directly induces ocular dominance plasticity with epigenetic changes (MeCP2 foci, methylation of plasticity gene promoters) in parvalbumin interneurons. |
OTX2 cortical infusion; Otx2+/GFP mice; gene expression analysis; viral Gadd45b overexpression; ocular dominance plasticity assay; MeCP2 and methylation analysis |
Cerebral cortex (New York, N.Y. : 1991) |
High |
29771284
|
| 2016 |
Hmga2 is required for Otx2-dependent exit of ESCs from pluripotent ground state; Hmga2 associates with Otx2-bound enhancer loci in EpiLCs and is required for Otx2 binding to and activation of new enhancers during differentiation; a positive feedback loop exists as Hmga2 is itself an Otx2 target gene. |
ChIP in ESCs/EpiLCs; Hmga2 KO iPSCs; gene expression analysis; comparison of Otx2 ChIP in WT vs KO |
BMC biology |
Medium |
27036552
|
| 2017 |
OTX2 and NANOG are functionally antagonistic in specifying ESC identity: ESCs lacking Nanog or overexpressing Otx2 adopt an early primed identity and fail to revert to naive state; Otx2-null ESCs exhibit naive identity features and convert poorly into primed state; loss of both drives primed identity with weakened naive conversion. |
Genetic KO and overexpression in mouse ESCs; 2i and FGF-treatment assays; gene expression analysis |
Stem cell reports |
Medium |
29056334
|
| 2020 |
OTX2 represses sister cell fate choices in the developing retina to promote photoreceptor specification; CRISPR/Cas9 somatic OTX2 mutations in chick retina combined with single-cell RNA-seq show OTX2 is required not only for photoreceptor generation but also for repression of specific retinal ganglion cell and horizontal cell subtypes. |
CRISPR/Cas9 somatic gene editing in chick retina; single-cell RNA sequencing |
eLife |
High |
32347797
|
| 2020 |
OTX2 silencing in Group 3 medulloblastoma modulates the repressive chromatin landscape, decreases PRC2 complex genes, and increases PAX3 and PAX6; PAX3 (but not PAX6) inhibits self-renewal and increases survival in vivo; mTORC1 signaling is identified as a downstream effector of the OTX2-PAX3 axis. |
OTX2 silencing; multi-omic analysis (chromatin, expression); single-cell RNA-seq; PAX3/PAX6 functional assays; in vivo survival assay |
Nature communications |
High |
32686664
|
| 2015 |
Lhx1 forms a protein complex with Otx2, Foxa2, and the chromatin-looping protein Ldb1 in the anterior mesendoderm, as demonstrated by proteomic co-immunoprecipitation; Lhx1-binding sites are enriched at enhancers controlling Otx2 and Foxa2 expression (identified by ChIP-seq). |
Proteomic co-immunoprecipitation; ChIP-seq for Lhx1; conditional KO |
Genes & development |
Medium |
26494787
|
| 2007 |
Functional roles of Otx2 in postnatal retina: Otx2 contributes to terminal differentiation of photoreceptors (demonstrated by Otx2+/-;Crx-/- double KO showing enhanced degeneration); conditional bipolar-cell-specific Otx2 KO causes downregulation of protein kinase C (mature bipolar cell marker) and impaired bipolar cell electroretinographic function. |
Double conditional knockout (Otx2/Crx); bipolar cell-specific conditional Otx2 KO; immunohistochemistry; electroretinography |
Molecular and cellular biology |
High |
17908793
|
| 2016 |
TNF-α secreted from activated monocytes mediates downregulation of OTX2 and essential RPE genes (including visual cycle genes) in RPE cells, demonstrating that OTX2 expression is regulated by inflammatory signals in the adult retina. |
Coculture of monocytes with porcine RPE and human iPSC-derived RPE; TNF-α neutralization/antibody blockade; gene expression analysis |
Aging cell |
Medium |
27660103
|