| 1995 |
MEIS1 was identified as a novel TALE-class homeobox gene whose homeodomain is most closely related to PBX/exd family proteins, suggesting cooperative binding with HOX proteins; viral integration at the Meis1 locus in BXH-2 murine myeloid leukemias produces an additional truncated transcript, implicating altered MEIS1 expression in myeloid leukemogenesis. |
Northern blot, cDNA cloning, retroviral insertional mutagenesis in BXH-2 mice |
Molecular and cellular biology |
High |
7565694
|
| 1997 |
MEIS1 proteins form heterodimeric DNA-binding complexes with AbdB-like HOX proteins (HOXA9, HOXA10, HOXA11, HOXD12, HOXB13) on a composite DNA target containing a MEIS1 site (TGACAG) and an AbdB-like HOX site; HOX proteins dramatically stabilize MEIS1 DNA binding, as shown by slower dissociation kinetics of the complex compared to MEIS1 alone. |
In vitro DNA-binding assay (EMSA), gel mobility shift, cooperative binding analysis |
Molecular and cellular biology |
High |
9343407
|
| 1997 |
MEIS1 and its relative pKNOX1 dimerize with PBX1 on a TGATTGAC motif; the MEIS1/pKNOX1 interaction domain maps to a conserved N-terminal PBX domain that is deleted in the leukemic oncoprotein E2a-PBX1, explaining why MEIS1 fails to dimerize with E2a-PBX1. The interaction interface on MEIS1 is distinct from the tryptophan motif used by HOX proteins. |
EMSA, cooperative DNA-binding assays, deletion mapping, comparison with E2a-PBX1 |
Proceedings of the National Academy of Sciences of the United States of America |
High |
9405651
|
| 1998 |
MEIS1 cooperatively binds the cAMP-responsive sequence CRS1 of bovine CYP17 together with PBX1; neither protein binds alone. Mutagenesis shows a dedicated MEIS1 binding site adjacent to the PBX site, and the conserved tryptophan N-terminal to the MEIS1 homeodomain is NOT required for Pbx cooperative binding, distinguishing the PBX-MEIS1 interaction from the PBX-HOX interaction. The interaction is evolutionarily conserved with Drosophila extradenticle and C. elegans ceh-20. |
CRS1 affinity chromatography purification of MEIS1 from adrenal cell extracts, EMSA, site-directed mutagenesis |
The Journal of biological chemistry |
High |
9525891
|
| 1998 |
Homothorax (hth), the Drosophila orthologue of MEIS1, is required for nuclear localization of Extradenticle (EXD, orthologue of PBX); ectopic HTH drives ectopic nuclear EXD. In hth mutants, EXD protein remains cytoplasmic; in exd mutants, HTH protein levels are severely reduced, establishing a mutual dependency. |
Genetic epistasis in Drosophila, immunostaining, ectopic expression experiments |
Development (Cambridge, England) |
High |
9463350
|
| 1999 |
MEIS1 promotes nuclear import of PBX1 in vertebrate limb cells; Meis1/2 expression is restricted to the proximal limb domain coinciding with nuclear PBX1; ectopic Meis1 in chicken limb or hth in Drosophila abolishes distal limb structures and causes distal-to-proximal identity transformations, demonstrating that restriction of Meis1/Hth to proximal regions is essential for proximodistal limb patterning. |
In situ hybridization, immunostaining, ectopic overexpression in chick and Drosophila, Drosophila genetics |
Nature |
High |
10586884
|
| 1999 |
HOXA9, PBX2, and MEIS1 form trimeric complexes in myeloid cell nuclei: MEIS1 enhances in vitro HOXA9-PBX protein complex formation in the absence of DNA and forms a trimeric EMSA complex on PBX-HOXA9 oligonucleotides. Immunoprecipitation of HOXA9 from myeloid cell extracts co-precipitates PBX2 and MEIS1. The three proteins co-localize in nuclear speckles. |
In vitro EMSA, co-immunoprecipitation from myeloid cell nuclear extracts, immunofluorescence co-localization |
Molecular and cellular biology |
High |
10082572
|
| 1999 |
Pbx-Meis1/Prep1 heterodimers bind DNA cooperatively with myogenic bHLH transcription factors (MyoD, myogenin, Mrf-4, Myf-5) through a conserved tryptophan motif N-terminal to the bHLH DNA-binding domain; this tryptophan motif is required for MyoD to remodel chromatin at the Myogenin promoter and activate Myogenin transcription in vivo. |
EMSA, tryptophan motif mutagenesis, chromatin remodeling assay, transactivation assay |
Nucleic acids research |
High |
10471746
|
| 2001 |
MEIS1 genetically collaborates with both HOXA9 and HOXB3 to induce AML, but PREP1 overexpression cannot substitute for MEIS1 in HOXA9-induced AML despite shared ability to retain PBX in the nucleus, demonstrating that MEIS1 leukemogenic function extends beyond PBX nuclear retention. |
Murine bone marrow transplantation leukemia model, retroviral overexpression, genetic epistasis |
Molecular and cellular biology |
High |
11113197
|
| 2003 |
MEIS1, PBX1B, and PBX2 bind as MEIS1/PBX complexes to the TME (tandem repeat of MEIS1 binding element) in the platelet factor 4 (PF4) promoter to activate PF4 transcription in megakaryocytic cells; disruption of MEIS1 binding sites reduces promoter activity by approximately half in megakaryocytic HEL cells. |
EMSA, DNA affinity chromatography, Western blot, supershift assay, promoter reporter assay, dominant-negative inhibition |
Blood |
High |
12609849
|
| 2004 |
Meis1-deficient mouse embryos die by E14.5 with failure to produce megakaryocytes, extensive hemorrhaging, lack of well-formed capillaries, and severely reduced colony-forming hematopoietic cells; Meis1-/- fetal liver cells fail to radioprotect irradiated mice and compete poorly in repopulation assays, establishing Meis1 as required for definitive hematopoiesis, megakaryocyte production, angiogenesis, and hematopoietic stem cell function. |
Germline knockout mouse, fetal liver transplantation, radioprotection assay, competitive repopulation, histology |
The EMBO journal |
High |
14713950
|
| 2004 |
Hoxa9 and Meis1 are key transcriptional targets upregulated by MLL-ENL; enforced co-expression of Hoxa9 with Meis1 is sufficient to substitute for MLL-ENL function and maintain continuous proliferation and differentiation arrest of hematopoietic cells. |
Inducible MLL-ENL-ERtm system, microarray expression profiling, retroviral co-expression, proliferation and differentiation assays |
Molecular and cellular biology |
High |
14701735
|
| 2005 |
Meis1 programs expression of FLT3 and CD34 (HSC-specific genes) in Hoxa9-immortalized myeloid progenitors, converting them to AML-initiating cells. Meis1 leukemogenic activity requires PBX binding, DNA binding, and a conserved C-terminal tail function. Meis1 establishes leukemia stem cell character through induction of HSC-associated genes. |
Retroviral transduction, in vitro progenitor culture, leukemia transplantation assay, domain deletion mutants |
Blood |
High |
15755900
|
| 2006 |
A dominant transactivating VP16-Meis1 fusion acts as an autonomous oncogene without co-expressed HOX genes and all resulting leukemias show activation of endogenous Hoxa9/Hoxa7, indicating HOX gene activation is a key downstream event. ChIP confirmed co-occupancy of Hoxa9 and Meis1 on the Flt3 promoter, demonstrating Meis1-Pbx and Hox-Pbx complexes co-occupy leukemogenic promoters. |
VP16/engrailed fusion proteins, retroviral transformation, chromatin immunoprecipitation (ChIP) on Flt3 promoter |
Molecular and cellular biology |
High |
16648484
|
| 2007 |
Meis1 is an essential and rate-limiting regulator of MLL leukemia stem cell potential; knockout, knockdown, and dominant-negative approaches show that MLL transformation requires Meis1 and is co-dependent on redundant contributions of Pbx2 and Pbx3. Meis1 quantitatively controls self-renewal extent, differentiation arrest, cycling, and in vivo LSC generation rate. |
Conditional knockout, shRNA knockdown, dominant-negative genetic approaches, in vivo LSC frequency assay |
Genes & development |
High |
17942707
|
| 2008 |
Meis1 directly occupies regulatory sequences of Trib2, Flt3, Dlk1, Ccl3, Ccl4, Pf4, and Rgs1 as shown by ChIP; the PBX-interaction domain, homeodomain, and C-terminal domain are all required for Meis1 leukemogenic collaboration with NUP98-HOXD13, while the N-terminal domain is required for Flt3 upregulation but dispensable for leukemia, indicating Flt3-independent leukemogenic pathways. |
ChIP, structure-function deletion analysis, murine bone marrow transplantation, gene expression profiling |
Experimental hematology |
High |
18375036
|
| 2009 |
Meis1 regulates proximodistal patterning of the mouse limb in a Pbx1-independent manner; Msx2:Meis1 transgenic mice display altered P-D patterning and shifted Hox gene expression domains similar to chick, but Pbx1 deficiency does not modify this phenotype, suggesting Pbx1 is dispensable or another Pbx paralog provides the Meis1 partner function in this context. |
Transgenic mouse overexpression (Msx2 promoter-driven Meis1), Pbx1 knockout cross, limb Hox gene expression analysis |
The International journal of developmental biology |
Medium |
19247936
|
| 2009 |
HOXA9 modulates Meis1 expression indirectly through upregulation of CREB1 and PKNOX1: ChIP showed HOXA9 does not directly bind the Meis1 promoter, but HOXA9 directly activates CREB1 and PKNOX1 transcription, and forced CREB1 expression in Hoxa9-/- bone marrow restores Meis1 mRNA levels, identifying CREB1 as a mediator of HOXA9 regulation of Meis1. |
ChIP, gene expression analysis in Hoxa9-/- mice, retroviral CREB1 overexpression rescue experiment |
Molecular and cellular biology |
High |
19620287
|
| 2010 |
GSK-3 promotes conditional association of CREB and its coactivators TORC and CBP with MEIS1 to facilitate HOX-mediated transcription and transformation in MLL leukemia; this mechanism is required for maintenance of the MLL leukemia stem cell transcriptional program and applies broadly to HOX-associated leukemias. |
Co-immunoprecipitation of CREB/TORC/CBP with MEIS1, GSK-3 inhibition, reporter gene assays, leukemia transformation assays |
Cancer cell |
High |
20541704
|
| 2010 |
Meis1 directly activates cyclin D3 transcription; a transcriptional repressor form (M33-Meis1) blocks G1-to-S phase progression by reducing cyclin D3 levels and inhibiting Rb hyperphosphorylation; overexpression of cyclin D3 partially rescues M33-Meis1-induced growth suppression, linking Meis1 growth-promoting activity to the cyclin D-Rb cell cycle axis. |
ChIP identifying cyclin D3 as direct target, M33-Meis1 repressor fusion, cell cycle analysis, Rb phosphorylation assay, cyclin D3 rescue experiment |
Blood |
High |
20237320
|
| 2010 |
Meis1 and Pbx act upstream of gata1 in the erythropoietic transcription factor hierarchy in zebrafish; morpholino knockdown of Meis1 and Pbx causes severe reduction in gata1 expression and failure to produce circulating erythrocytes with increased myeloid cells; gata1 overexpression rescues hemoglobin expression in Pbx/Meis1-depleted embryos. |
Morpholino knockdown in zebrafish, genetic rescue by gata1 mRNA injection, in situ hybridization |
Developmental biology |
High |
20123093
|
| 2010 |
ELF1, an ETS transcription factor, directly binds a conserved site 289 bp upstream of the human MEIS1 transcription start site and is required for MEIS1 promoter activity; ELF1 ChIP confirms enrichment at the MEIS1 promoter in MEIS1-expressing cells, and siRNA knockdown of ELF1 reduces MEIS1 expression. |
Phylogenetic sequence analysis, promoter reporter assay with truncation/mutation, EMSA, ChIP, siRNA knockdown |
Experimental hematology |
High |
20600580
|
| 2011 |
MN1-induced leukemogenesis requires the MEIS1/AbdB-like HOX-protein complex; ChIP-seq shows extensive overlap of MN1 and MEIS1 chromatin binding sites; common myeloid progenitors (CMP) but not granulocyte-macrophage progenitors (GMP) can be transformed by MN1, and complementation of GMP with MEIS1/AbdB-like HOX genes restores susceptibility, demonstrating cell-of-origin susceptibility is determined by MEIS1/HOX expression. |
ChIP-seq, complementation assay in primary bone marrow cells, in vivo leukemia transplantation |
Cancer cell |
High |
21741595
|
| 2013 |
Meis1 is a critical transcriptional regulator of cardiomyocyte cell cycle arrest; cardiomyocyte-specific Meis1 deletion extends the postnatal proliferative window and reactivates cardiomyocyte mitosis in adult heart without deleterious cardiac function effects; Meis1 overexpression decreases neonatal myocyte proliferation and inhibits neonatal heart regeneration. Meis1 is required for transcriptional activation of CDK inhibitors p15, p16, and p21. |
Cardiomyocyte-specific conditional knockout, Meis1 overexpression in neonatal heart, cardiomyocyte mitosis assay, cardiac function assessment, target gene expression analysis |
Nature |
High |
23594737
|
| 2014 |
PREP1 and MEIS1 competitively heterodimerize with PBX1 in mouse embryonic fibroblasts; MEIS1 alone transforms Prep1-deficient fibroblasts; PREP1 overexpression inhibits MEIS1 tumorigenicity by sequestering PBX1, which destabilizes MEIS1 protein post-translationally. MEIS1 interaction with DDX3X and DDX5 (identified by Prep1-competition reducing these interactions) is essential for MEIS1-driven tumorigenesis. |
Co-immunoprecipitation, transformation assay in MEFs, protein stability assay, transcriptomic analysis |
Proceedings of the National Academy of Sciences of the United States of America |
High |
24578510
|
| 2014 |
Conditional Meis1 knockout in adult hematopoietic cells causes significant reduction in hematopoietic stem/progenitor cells due to impaired self-renewal and reduced quiescence in a cell-autonomous manner, resulting in stem cell exhaustion. Meis1 deficiency downregulates Pbx1-dependent HSC signature genes, indicating functional cooperation with Pbx1 in HSC maintenance. |
Conditional knockout in adult mice (tamoxifen-inducible), FACS enumeration of HSPCs, competitive transplantation, BrdU quiescence assay, gene expression profiling |
PloS one |
High |
24498346
|
| 2014 |
C/EBPα is a critical collaborator required for Hoxa9/Meis1-mediated leukemogenesis; over 50% of Hoxa9 genome-wide binding sites are co-bound by C/EBPα; Hoxa9 represses the Cdkn2a/b locus in concert with C/EBPα to overcome G1 cell cycle arrest; C/EBPα loss greatly improves survival in Hoxa9/Meis1-induced leukemia models. |
ChIP-seq, in vitro transformation assay, murine leukemia model, loss-of-function genetic approach |
Proceedings of the National Academy of Sciences of the United States of America |
High |
24958854
|
| 2014 |
An RLS-associated intronic SNP (rs12469063) in MEIS1 reduces enhancer activity in the ganglionic eminences of the developing mouse forebrain; CREB1 binds this enhancer and the risk SNP affects CREB1 binding in vitro; heterozygous Meis1-deficient mice exhibit circadian hyperactivity resembling RLS phenotype. |
Zebrafish and mouse enhancer reporter assays, EMSA for CREB1 binding with allelic variants, heterozygous Meis1 KO behavioral phenotyping |
Genome research |
High |
24642863
|
| 2015 |
Pbx3 and Meis1 must dimerize to support Hox-induced leukemia; in the absence of Pbx3, Meis1 is rapidly ubiquitinated and degraded via the proteasome. The Meis1 Pbx-binding domain is required to prevent ubiquitination; Pbx3 binding stabilizes Meis1. Additionally, Pbx3 overexpression induces endogenous Meis1 transcription. Meis1/Pbx3 dimerization is required for high-affinity DNA/Hoxa9/Meis1/Pbx3 complex formation in vitro. |
Deletion analysis, protein half-life assay, proteasome inhibition, in vitro EMSA for quaternary complex, murine leukemia transplantation |
Haematologica |
High |
25911551
|
| 2015 |
PBX3 and MEIS1 co-expression, without a HOX gene, is sufficient to transform normal mouse hematopoietic stem/progenitor cells and cause AML in vivo, recapitulating the MLL-fusion core transcriptome including endogenous Hoxa gene upregulation; disruption of MEIS1-PBX3 binding abolishes transformation and HOX gene upregulation. |
Retroviral co-expression in primary mouse HSPC, in vitro transformation assay, in vivo transplantation AML model, gene expression profiling, interaction-disrupting mutants |
Cancer research |
High |
26747896
|
| 2015 |
MEIS1 binds an upstream sequence of Pax6 to enhance its transcription in cerebellar granule cell precursors; this Meis1-Pax6 cascade upregulates Smad proteins to enhance BMP signaling, leading to Atoh1 protein degradation in the inner EGL and promoting GCP-to-GC differentiation. Conditional Meis1 KO in the GC lineage causes smaller cerebella with disorganized lobules and ectopic Atoh1-positive GCPs. |
Conditional cerebellar KO, ChIP for Pax6 upstream sequence, in vitro promoter assay, Smad/BMP pathway analysis, Atoh1 expression analysis |
The Journal of neuroscience |
High |
29317485
|
| 2015 |
Sequential and mutually exclusive binding of MEIS1 and NKX2-5 to overlapping sites on the Popdc2 cardiac gene enhancer provides a mechanism for spatiotemporal regulation: as cardiac progenitors differentiate, they sequentially experience high MEIS1 then increasing NKX2-5, whose binding displaces MEIS1 from shared target sites to switch transcriptional output. |
ChIP, reporter assays, in vitro binding competition assay, expression profiling during cardiac differentiation |
Cell reports |
High |
26411676
|
| 2015 |
Meis1 regulates a HLF-oxidative stress axis in MLL leukemia: Meis1 loss leads to increased oxidative stress, oxygen flux, and apoptosis in leukemic cells; ChIP and gene expression studies identify HLF as a direct Meis1 target gene; hypoxia or HLF expression rescues leukemia development in Meis1-deficient cells. |
Inducible Meis1-knockout crossed with MLL-AF9 knockin mice, ChIP for HLF promoter, oxidative stress measurement, HLF rescue experiment |
Blood |
High |
25740828
|
| 2015 |
MEIS1 promoter is hypomethylated and transcriptionally reactivated in DNMT3A-mutant AML patients; whole-genome bisulfite sequencing and DNA methylation microarrays identify MEIS1 as the key gene undergoing promoter hypomethylation-associated reactivation, providing an alternative (MLL-fusion-independent) mechanism for engaging MEIS1-dependent oncogenic transcription. |
Whole-genome bisulfite sequencing, DNA methylation microarrays in patient samples |
Oncogene |
Medium |
26434589
|
| 2016 |
MEIS1 promotes leukemic cell homing and engraftment in bone marrow through transactivation of synaptotagmin-like 1 (SYTL1/SLP1); ChIP in leukemic cells shows MEIS1 directly binds the SYTL1 gene; SYTL1 replacement in MEIS1-deficient cells restores cell migration and engraftment; SYTL1 activates CXCL12/CXCR4 signaling by regulating intracellular trafficking of CXCR4. |
ChIP for SYTL1 promoter, MEIS1 deficiency murine model, SYTL1 rescue experiment, CXCR4 trafficking assay, migration assay |
The Journal of clinical investigation |
High |
27018596
|
| 2017 |
Hoxa9 and Meis1 cooperatively suppress miR-146a to upregulate Syk expression and activity in AML; Meis1 regulates Syk indirectly through PU.1-dependent regulation of miR-146a, which directly targets Syk; Syk signaling in turn induces Meis1 in the context of Hoxa9, creating a regulatory feedback loop; Syk inhibition disrupts this loop and prolongs survival of Hoxa9/Meis1 AML mice. |
(Phospho)proteomic analysis, miR-146a target validation for Syk, ChIP/reporter assays for PU.1-miR-146a axis, Syk inhibitor treatment in murine AML model |
Cancer cell |
High |
28399410
|
| 2018 |
PPM1K (a mitochondrial Ser/Thr phosphatase promoting BCAA catabolism) maintains MEIS1 and p21 protein levels by decreasing CDC20-mediated ubiquitination and degradation; PPM1K deficiency reduces MEIS1/p21 signaling, impairs HSC glycolysis and quiescence, and decreases repopulation; PPM1K deletion also extends survival in a murine leukemia model. |
Genetically encoded BCAA fluorescent sensor, conditional KO, ubiquitination assay, HSC functional assays |
Cell reports |
High |
29719258
|
| 2018 |
MEIS1 controls human hematopoiesis from pluripotent stem cells in a stage-specific manner: it is required for specification of APLNR+ mesoderm progenitors to functional hemogenic endothelial progenitors (via TAL1 as downstream mediator), and is separately required for megakaryopoiesis/thrombopoiesis (via FLI1 as downstream target); mechanistic ChIP or promoter binding for TAL1 and FLI1 within this context was demonstrated. |
hPSC differentiation, MEIS1 overexpression/knockdown, ChIP for TAL1 and FLI1, functional hematopoietic assays |
Stem cell reports |
High |
29358086
|
| 2018 |
MEIS1 directly binds two specific sites in the SKOR1 promoter to positively regulate SKOR1 expression; an RLS-associated SNP in the SKOR1 promoter region modifies MEIS1-driven activation, directly linking two GWAS-identified RLS genes through a transcriptional regulatory relationship. |
MEIS1 ChIP at SKOR1 promoter sites, promoter reporter assay with site mutagenesis, allele-specific reporter assay with RLS SNP |
Scientific reports |
High |
30111810
|
| 2018 |
MEIS1 interacts directly with the androgen receptor (AR) protein; co-immunoprecipitation and GST pull-down confirm a protein-protein interaction; MEIS1 modulates AR cytoplasm/nucleus translocation, reduces AR recruitment to the PSA gene promoter androgen response element, and promotes recruitment of corepressors NCoR and SMRT in the presence of androgen, acting as a novel AR co-repressor. |
Co-immunoprecipitation, GST pull-down, nuclear fractionation, ChIP for AR at PSA promoter, reporter assay |
Experimental cell research |
High |
25158280
|
| 2019 |
MEIS1 suppression in fetal cardiomyocytes (siRNA) increases maximal oxygen consumption and mitochondrial activity while decreasing expression of glycolytic genes, demonstrating that MEIS1 actively suppresses oxidative phosphorylation and promotes glycolysis in the developing cardiomyocyte; the normal developmental downregulation of MEIS1 around birth underlies the perinatal metabolic switch. |
siRNA knockdown in primary fetal sheep cardiomyocytes, Seahorse metabolic flux analysis, MitoTracker staining, gene expression analysis |
FASEB journal |
High |
30884246
|
| 2016 |
Meis1 inactivation in mouse neural crest leads to altered sympatho-vagal cardiac regulation and increased susceptibility to sudden cardiac death; Meis1-deficient sympathetic neurons die by apoptosis from embryonic to perinatal stages; Meis1 regulates transcription of key molecules for the endosomal machinery, and Rab5+ endosome trafficking is severely altered in Meis1-inactivated sympathetic neurons. |
Neural crest-specific conditional Meis1 knockout, cardiac electrophysiology, sympathetic neuron survival assay, endosome trafficking analysis |
eLife |
High |
26857994
|
| 2013 |
Gfi1b directly represses Meis1 transcription in the erythroid lineage but not in megakaryocytes; Gfi1b and its cofactors LSD1 and CoREST occupy distinct regions of the Meis1 promoter in erythroid cells; LSD1 inhibition upregulates Meis1 specifically in erythroid cells; the repression requires the Gfi1b SNAG domain and DNA binding domain as shown by transfection of mutant forms. |
ChIP for Gfi1b/LSD1/CoREST at Meis1 promoter, LSD1 inhibitor treatment, gfi1b knockout fetal liver, promoter reporter assay with Gfi1b mutants |
PloS one |
High |
23308270
|
| 2022 |
MEIS1 transcription is epigenetically suppressed in colorectal cancer by EZH2-DNMT3a recruited by lncRNA ELFN1-AS1 to the MEIS1 promoter; MEIS1 suppression drives oxaliplatin resistance through enhanced FEN1 expression; EZH2 inhibitor GSK126 or ELFN1-AS1 ASO restores MEIS1 expression and reverses resistance. |
lncRNA-protein complex analysis, ChIP for EZH2/DNMT3a at MEIS1 promoter, FEN1 expression assay, in vivo tumor xenograft, drug resistance assay |
Signal transduction and targeted therapy |
High |
35351858
|