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Identification of target genes of the DELLA protein RGL2 during the repression of seed germination

ABSTRACT: To shed light on the genetic events downstream of DELLA proteins, we have employed a microarray expression profiling of Arabidopsis thaliana seeds to identify target genes of the DELLA protein RGL2. Seeds of the germinating ga1-3 rga-t2 rgl2-1 and the non-germinating ga1-3 rga-t2 mutant were stratified, and RNA was extracted after five days. Transcript profiles of the non-germinating seeds closely resemble profiles of dormant seeds, and several transcription factors involved in light- and phytohormone-regulated signalling pathways appear to be up-regulated, suggesting that RGL2 controls various physiological aspects to inhibit seed germination.

ORGANISM(S): Arabidopsis thaliana

PROVIDER: GSE40485 | GEO | 2012/08/31

SECONDARY ACCESSION(S): PRJNA174131

REPOSITORIES: GEO

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Identification of target genes of the DELLA protein RGL2 during the repression of seed germination

Project description:To shed light on the genetic events downstream of DELLA proteins, we have employed a microarray expression profiling of Arabidopsis thaliana seeds to identify target genes of the DELLA protein RGL2. Seeds of the germinating ga1-3 rga-t2 rgl2-1 and the non-germinating ga1-3 rga-t2 mutant were stratified, and RNA was extracted after five days. Transcript profiles of the non-germinating seeds closely resemble profiles of dormant seeds, and several transcription factors involved in light- and phytohormone-regulated signalling pathways appear to be up-regulated, suggesting that RGL2 controls various physiological aspects to inhibit seed germination. Gene expression five days after stratification was measured in ga1-3 rga-t2 seeds, using seeds of the ga1-3 rga-t2 rgl2-1 mutant as reference. Two biological replicates were performed for each sample.

2012-08-31 | E-GEOD-40485 | biostudies-arrayexpress

RNA-sequencing of estradiol inducible DOF6 overexpression (DOF6ioex) and rgl2-13 DOF6ioex seeds imbibed in mock or 50µM estradiol for 8h

Project description:The DELLA protein RGA-LIKE2 (RGL2) is a key transcriptional repressor of gibberellic acid (GA) signaling that regulates seed germination.RGL2 lacks a DNA binding domain and requires a transcription factor to induce GATA12 expression. Our data show that this RGL2-containing protein complex includes DNA BINDING1 ZINC FINGER6 (DOF6), which is a known negative regulator of germination in freshly harvested seeds. The RGL2-DOF6 complex regulates primary seed dormancy in Arabidopsis by regulating downstreming targets.

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della-regulation in darkness versus light-DELLAs contribute to skotomorphogenesis

Project description:rs09-09_della-dark - della-regulation in darkness versus light - Identification of DELLA-dependent downstream targets in darkness - Aim was to determine downstream target of DELLA proteins involved in skotomorphogenesis. Wt, ga1-3, ga1-3_rga_gai_rgl1_rgl2_rgl3 global seeds were sterilized, sown on MS agar plates then put for stratification for 3 days at 4°C. Plates were placed in growth cabinet at 22°C for 5 days in darkness or in continous light. Keywords: gene knock out

2011-06-13 | GSE22681 | GEO

Phosphorylation Promotes DELLA Activity by Enhancing Its Binding to Histone H2A at Target Chromatin in Arabidopsis

Project description:DELLA proteins are conserved master growth regulators that play a central role in controlling plant development in response to internal and environmental cues. DELLAs function as transcription regulators, which are recruited to target promoters by binding to transcription factors (TFs) and histone H2A via its GRAS domain. Recent studies showed that DELLA stability is regulated post-translationally via two mechanisms, phytohormone gibberellin-induced polyubiquitination for its rapid degradation, and Small Ubiquitin-like Modifier (SUMO)-conjugation to alter its accumulation. Moreover, DELLA activity is dynamically modulated by two distinct glycosylations: DELLA-TF interactions are enhanced by O-fucosylation, but inhibited by O-linked N-acetylglucosamine (O-GlcNAc) modification. However, the role of DELLA phosphorylation remains unclear. Here, we identified phosphorylation sites in REPRESSOR OF ga1-3 (RGA, an AtDELLA) purified from Arabidopsis by tandem mass spectrometry analysis, and showed that phosphorylation of the RGA LKS-peptide in the poly-S/T region enhances RGA-H2A interaction and RGA association with target promoters. Interestingly, phosphorylation does not affect RGA-TF interactions. Our study has uncovered that phosphorylation is a new regulatory mechanism of DELLA activity.

2024-08-08 | PXD046004 | Pride

della-regulation in darkness versus light-DELLAs contribute to skotomorphogenesis

Project description:rs09-09_della-dark - della-regulation in darkness versus light - Identification of DELLA-dependent downstream targets in darkness - Aim was to determine downstream target of DELLA proteins involved in skotomorphogenesis. Wt, ga1-3, ga1-3_rga_gai_rgl1_rgl2_rgl3 global seeds were sterilized, sown on MS agar plates then put for stratification for 3 days at 4Â°C. Plates were placed in growth cabinet at 22Â°C for 5 days in darkness or in continous light. Keywords: gene knock out 9 dye-swap - CATMA arrays

2011-06-12 | E-GEOD-22681 | biostudies-arrayexpress

The PFYRE Subdomain in Master Growth Repressor DELLA is Essential for Its Association with Target Chromatin via Histone H2A Binding

Project description:The DELLA genes encode conserved master growth repressors in plants, and they are also known as ‘Green Revolution’ genes because of their pivotal role in modulating stature of the high-yielding wheat varieties, which were crucial for the success of the ‘Green Revolution’ in the 1960s. At the cellular level, DELLA proteins are nuclear-localized transcription regulators, which play a central role in controlling plant development in response to internal and environmental cues. Recent studies indicate that DELLAs regulate expression of target genes via direct protein-protein interaction of their C-terminal GRAS domain with hundreds of key transcription factors (TFs) and epigenetic regulators. However, the molecular mechanism of DELLA-mediated transcription reprogramming remains unclear. Here, by characterizing missense alleles of an Arabidopsis DELLA, REPRESSOR OF ga1-3 (RGA), we unveil a novel function of the PFYRE subdomain within its GRAS domain for binding to histone H2A via pulldown and co-IP assays. ChIP-Seq analysis further show that this activity is essential for RGA association with its target chromatin globally. Our results indicate that although DELLAs are recruited to target gene promoters by binding to TFs via its LHR1 subdomain, DELLA-H2A interaction via its PFYRE subdomain is necessary to stabilize the TF-DELLA-H2A complex at the target chromatin. This study provides new insight into the two distinct key modular functions in DELLA for its genome-wide transcription regulation in plants. The assay for transposase-accessible chromatin using sequencing (ATAC-seq) for RGA vs rga-11 and RGA treated with GA or mock.

2023-06-27 | GSE233124 | GEO

The PFYRE Subdomain in Master Growth Repressor DELLA is Essential for Its Association with Target Chromatin via Histone H2A Binding

Project description:The DELLA genes encode conserved master growth repressors in plants, and they are also known as ‘Green Revolution’ genes because of their pivotal role in modulating stature of the high-yielding wheat varieties, which were crucial for the success of the ‘Green Revolution’ in the 1960s. At the cellular level, DELLA proteins are nuclear-localized transcription regulators, which play a central role in controlling plant development in response to internal and environmental cues. Recent studies indicate that DELLAs regulate expression of target genes via direct protein-protein interaction of their C-terminal GRAS domain with hundreds of key transcription factors (TFs) and epigenetic regulators. However, the molecular mechanism of DELLA-mediated transcription reprogramming remains unclear. Here, by characterizing missense alleles of an Arabidopsis DELLA, REPRESSOR OF ga1-3 (RGA), we unveil a novel function of the PFYRE subdomain within its GRAS domain for binding to histone H2A via pulldown and co-IP assays. ChIP-Seq analysis further show that this activity is essential for RGA association with its target chromatin globally. Our results indicate that although DELLAs are recruited to target gene promoters by binding to TFs via its LHR1 subdomain, DELLA-H2A interaction via its PFYRE subdomain is necessary to stabilize the TF-DELLA-H2A complex at the target chromatin. This study provides new insight into the two distinct key modular functions in DELLA for its genome-wide transcription regulation in plants. Chromatin immunoprecipitation DNA-sequencing (ChIP-seq) for RGA, rga-11 as well as the negative control sly1 dP and sly1 dQ.

2023-06-27 | GSE220898 | GEO

DELLA protein direct targets in Arabidopsis

Project description:The aim of this study is to identify early DELLA protein-responsive genes using a Dexamethasone (DEX)-inducible system. Two transgenic lines were used: one induces the expression of a dominant, gibberellin non-responsive DELLA protein (rga-delta17); the other is a control line that carries the same vector, but lacks the rga-delta17 transgene. By comparing the gene expression changes in the line that expresses the rga-delta17 protein in the presence or absence of DEX it is possible to identify putative targets of DELLA proteins. An empty vector transgenic line was included in this study to identify genes that might be regulated by the DEX inducible system that are not dependent on the DELLA protein. Keywords: Dexamethasone treatment, gibberellin treatment, time course, transgene effect

2007-11-21 | GSE8741 | GEO

Transcriptomic analysis of regulatory gene expression profiles by NF-YCs, and RGL2 under paclobutrazol (PAC) condition

Project description:To understand how the NF-YC-RGL2 complex functions in repressing seed germination, a genome-wide transcriptomic analysis was carried out using germinating seeds of rgl2, nf-ycT and the wild-type (Col) grown on the medium containing 5 uM PAC and Col grown on mock treatment. Basing on the criteria of 1.5-fold cutoff for the genes with 5% false discovery rate, we first identified the differentially expressed genes in Col_PAC vs Col_mock, nf-ycT_PAC vs Col_PAC, and rgl2_PAC vs Col_PAC subsets, which are referred to as PAC-, NF-YC-, and RGL2-regulated genes.These data reveal that NF-YCs and RGL2 co-target a set of common genes in response to phytohormone signals, strongly supporting the role of NF-YC-RGL2 in seed germination regulation. Digital gene expression tag profiles of wild type (Col), nf-ycT mutant, and rgl2 mutant germinating seed for 12 h after stratification were generated by deep sequencing, in triplicate, using Illumina HiSeq 2000.

2016-07-25 | E-GEOD-84753 | biostudies-arrayexpress

Transcriptomic analysis of regulatory gene expression profiles by DELLA and LEC1 during embryo development in Arabidopsis thaliana.

Project description:To understand how GA functions in regulating embryo development, a genome-wide transcriptomic analysis was carried out using 9DAF seeds dissected from siliques of dellaq (rga28 gai rgl1 rgl2) and the wild-type (col-0-2) grown in full-spectrum white fluorescent light at 22°C under long day conditions (16 h light/8 h dark). Then we found that GA regulates embryo development via DELLA-LEC1interaction, a subsequent genome-wide transcriptomic analysis was carried out using 9DAF seeds dissected from siliques of lec1-4 and the wild-type (col-0-1) in the same growth condition. Basing on the criteria of 1.5-fold cutoff for the genes with 5% false discovery rate, we first identified the differentially expressed genes in dellaq vs col-0-2, lec1-4 vs Col-0-1 subsets, which are referred to as DELLA and LEC1 regulated genes. These data reveal that DELLAs and LEC1 co-target a set of common genes in late embryogenesis, strongly supporting the role of DELLA-LEC1 in embryo development.

2018-02-15 | GSE108544 | GEO

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