HDG1 transcription factor targets
Ontology highlight
ABSTRACT:
ORGANISM(S): Arabidopsis thaliana
PROVIDER: GSE54312 | GEO | 2015/01/22
SECONDARY ACCESSION(S): PRJNA236137
REPOSITORIES: GEO
Similar Datasets
Project description:The AIL transcription factor BABY BOOM (BBM) is required together with the related PLETHORA proteins for embryo and root meristem development and its expression is sufficient to confer pluripotency and totipotency to somatic tissues. We show that BBM and other AIL proteins interact with multiple members of the L1/epidermal-expressed HD-ZIP class IV / HOMEODOMAIN GLABROUS (HDG) transcription factor family. Ectopic overexpression of HDG1, HDG11 and HDG12 genes induces a reduced growth phenotype, and analysis of HDG1 overexpression lines shows that this growth reduction is due to both root and shoot meristem arrest. To understand how HDG1 controls cell proliferation, as well as its functional relationship with BBM, we performed microarray experiments to identify candidate genes that are directly regulated by HDG1, and compared these to the set of genes that are directly regulated by BBM expression. Transcriptomic profiling was done after 8 hours of dexamethasone induction of 35S::GR-HDG1 and wild-type Col-0 seedlings and significantly differentially expressed genes were identified as HDG1 targets.
2015-01-22 | E-GEOD-54312 | biostudies-arrayexpress
Project description:After fertilization, a plant's life relies on progression through embryogenesis and maintenance of the stem cell niches from which all post-embryonic organs arise. BABY BOOM (BBM) and other members of the AINTEGUMENTA-LIKE (AIL)/PLETHORA (PLT) clade of the AP2-type transcription factor family play important roles controlling these processes in Arabidopsis thaliana (Arabidopsis). Development of the plt2/bbm double mutant is blocked at during early embryogenesis (Galinha et al., 2007), and combinations of bbm with plt1 and plt3 lead to short roots as a result of meristem differentiation. In contrast, overexpression of BBM in Arabidopsis seedlings induces the formation of somatic embryos on cotyledons and leaves (Boutilier, 2002), showing that BBM is a key regulator of cell identity and proliferation. Although the functions of BBM and other AIL genes have been well described, the molecular mode of action of these transcription factors has not been well examined (reviewed in Horstman et al., 2013). Our previous study provided the first insight into BBM molecular function by identifying BBM targets through a microarray-based approach (Passarinho, 2008), but only a few BBM targets have been functionally characterized. To obtain a better understanding of BBM function, we identified direct BBM targets using a chromatin immunoprecipitation (ChIP) combined with massively-parallel DNA sequencing (ChIP-seq) approach.
2014-12-17 | GSE52400 | GEO
Project description:After fertilization, a plant's life relies on progression through embryogenesis and maintenance of the stem cell niches from which all post-embryonic organs arise. BABY BOOM (BBM) and other members of the AINTEGUMENTA-LIKE (AIL)/PLETHORA (PLT) clade of the AP2-type transcription factor family play important roles controlling these processes in Arabidopsis thaliana (Arabidopsis). Development of the plt2/bbm double mutant is blocked at during early embryogenesis (Galinha et al., 2007), and combinations of bbm with plt1 and plt3 lead to short roots as a result of meristem differentiation. In contrast, overexpression of BBM in Arabidopsis seedlings induces the formation of somatic embryos on cotyledons and leaves (Boutilier, 2002), showing that BBM is a key regulator of cell identity and proliferation. Although the functions of BBM and other AIL genes have been well described, the molecular mode of action of these transcription factors has not been well examined (reviewed in Horstman et al., 2013). Our previous study provided the first insight into BBM molecular function by identifying BBM targets through a microarray-based approach (Passarinho, 2008), but only a few BBM targets have been functionally characterized. To obtain a better understanding of BBM function, we identified direct BBM targets using a chromatin immunoprecipitation (ChIP) combined with massively-parallel DNA sequencing (ChIP-seq) approach. Somatic embryo tissue was used for the ChIP-seq experiments with the native BBM promoter (pBBM::BBM-YFP), with a line expressing nuclear-localized GFP from the same BBM promoter (pBBM::NLS-GFP) as a negative control. Whole, embryogenic seedlings of the 35S::BBM-GFP line were used for the 35S::BBM-GFP ChIP-seq experiments, with 35S::BBM embryogenic seedlings serving as a negative control. Both experiments were performed once, making a total of 4 samples.
2014-12-17 | E-GEOD-52400 | biostudies-arrayexpress
Project description:A glucocorticoid-regulated BBM protein (35S:BBM-GR) was used in combination with microarray analysis to identify genes directly activated by BBM. We employed the system described by (Lloyd et al., 1994) in which dexamethasone (DEX) and cycloheximide (CHX) are applied together to respectively, induce nuclear localization of the BBM-GR protein and prevent translation of the primary targets mRNAs. In this way it is possible to identify direct targets of a transcriptional activator by comparing gene expression profiles between DEX+CHX-treated transgenic and wild-type tissues. The ability of the 35S:BBM GR construct to induce somatic embryogenesis in Arabidopsis seedlings was determined by phenotypic observation of 35S:BBM GR seeds germinated and grown in the presence of 10 µM dexamethasone (DEX). As in 35S:BBM seedlings, we observed somatic embryo formation on the cotyledons, first leaves and shoot meristem of DEX-treated 35S:BBM GR seedlings. We identified a set of 20 genes (including BBM itself) and our analysis indicates that BBM directly activates a signaling pathway comprising transcription factors and other signaling molecules, but which does not initially include genes known to induce somatic embryogenesis, such as LEC1, LEC2 or WUS. The functions of the BBM target genes are unknown, however a number of them have recently been identified in microarray screens for meristem-expressed genes. The identification of BBM-interacting partners and downstream targets provides new tools for unraveling pathways related to plant cell growth and organogenesis. Keywords: transcriptional activation
2008-09-22 | GSE3399 | GEO
Project description:Results from experiments done on knock-down of adaxial class III HD ZIP genes, using overexpression of miR165a, in shoot meristem show that Class III HD-ZIP genes act generally to repress the formation of new growth axes where they are expressed. This study explored the genes directly regualted by miRNAs as well as indirectly regulated by class III HD-ZIPs.
2023-12-20 | GSE221030 | GEO
Project description:A glucocorticoid-regulated BBM protein (35S:BBM-GR) was used in combination with microarray analysis to identify genes directly activated by BBM. We employed the system described by (Lloyd et al., 1994) in which dexamethasone (DEX) and cycloheximide (CHX) are applied together to respectively, induce nuclear localization of the BBM-GR protein and prevent translation of the primary targets mRNAs. In this way it is possible to identify direct targets of a transcriptional activator by comparing gene expression profiles between DEX+CHX-treated transgenic and wild-type tissues. The ability of the 35S:BBM GR construct to induce somatic embryogenesis in Arabidopsis seedlings was determined by phenotypic observation of 35S:BBM GR seeds germinated and grown in the presence of 10 µM dexamethasone (DEX). As in 35S:BBM seedlings, we observed somatic embryo formation on the cotyledons, first leaves and shoot meristem of DEX-treated 35S:BBM GR seedlings. We identified a set of 20 genes (including BBM itself) and our analysis indicates that BBM directly activates a signaling pathway comprising transcription factors and other signaling molecules, but which does not initially include genes known to induce somatic embryogenesis, such as LEC1, LEC2 or WUS. The functions of the BBM target genes are unknown, however a number of them have recently been identified in microarray screens for meristem-expressed genes. The identification of BBM-interacting partners and downstream targets provides new tools for unraveling pathways related to plant cell growth and organogenesis. Keywords: transcriptional activation To identify candidate BBM targets, we treated 4 day old 35S:BBM-GR seedlings for 8 hours with 10 µM DEX in the presence of 10 µM CHX and compared the mRNA population from these seedlings using Arabidopsis Operon microarrays (http://www.ag.arizona.edu/microarray/) to that of 4 day old wild-type seedlings treated in the same way. The seed batches used in this analysis showed 100% EFS when grown continuously on media with 10 µM DEX. Four day old seedlings were chosen as the experimental material because they are highly responsive to BBM GR activation and provide sufficient RNA for the microarray experiments. The biological reproducibility of the data was monitored using two independent single locus 35S:BBM GR lines. The technical reproducibility of the data was monitored using two independently DEX + CHX-treated samples from each transgenic line. Dye effects were monitored in a dye-swap experiment using one of the four RNA samples from the two biological replicates
2010-06-25 | E-GEOD-3399 | biostudies-arrayexpress
Project description:To elucidate the functional role of the small signaling peptide RALF34 in the parental root meristem and its role in lateral root initiation, we studied changes in Cucumis sativus proteome during CsRALF34 gene overexpression. Composite plants with transgenic root systems carrying the construct for CsRALF34 overexpression (p35S::CsRALF34-TermAct) and control roots carrying p35S-GUS-TermAct were obtained and their proteome profiles were compared.
2023-05-10 | PXD037725 | Pride
Project description:BABY BOOM (BBM) ChIP-seq in Arabidopsis somatic embryo tissue
| PRJNA227780 | ENA
Project description:Anti-androgen therapies including the new androgen receptor (AR) antagonist MDV3100 are the first therapeutic approach in treating prostate cancer (PCa). However, tumors frequently become castration resistant through multiple mechanisms including alternative expression of AR splice variants. To identify new inhibitors which block both full-length AR (AR-FL) and constitutively-active truncated AR splice variants (AR-Vs), a library of natural compounds was screened for molecules that could inhibit AR-driven transcription in PCa cells expressing AR-FL or AR-Vs. We identified the small-molecule Ailanthone (AIL) as a potent inhibitor of both AR-FL and AR-Vs. AIL down-regulates both AR itself and its target genes in PCa cell lines as well as orthotopic animal tumors. Moreover，AIL directly binds to the co-chaperone protein p23 and prevents AR’s interaction with HSP90, which results in the disruption of the AR-chaperone complex followed by Ubiquitin/proteasome-mediated degradation of AR as well as other p23 clients including AKT and Cdk4. Meanwhile, overexpression of p23 dose-dependently rescued AIL-mediated cell proliferation inhibition, suggesting that p23 might be a critical target of AIL. Furthermore, treatment of MDV3100-resistant 22RV1 xenografts with AIL reduced tumor volume by 77.5% (2 mg/kg/day AIL, intraperitoneal) and 79.2% (5 mg/kg/day AIL, oral) compared with the control group. Finally, AIL possesses favorable drug-like properties such as good bioavailability (25.7% F), high solubility, lack of CYP inhibition, and low hepatotoxicity, although signs of gastrointestinal toxicity were observed at high doses. In conclusion, AIL overcomes MDV3100 resistance in castration resistant prostate cancer (CRPC) with excellent absorption, distribution, metabolism, excretion, and toxicity (ADME/Tox) properties, thus suggesting that AIL is a potential candidate for the clinical treatment of CRPC.
2016-11-30 | GSE85541 | GEO
Project description:gnp07_regeneome_transdifferenciation - microdissection - Study of the moleculars mecanism during transdifferenciation of Root ApicalMeristem to Shoot Apical Meristem - middle of growth permits to induce transdifferenciation of root apical meristem to shoot apical meristem
2012-06-01 | GSE30259 | GEO