Effect of the gi-2 mutation on Arabidopsis thaliana gene expression
Ontology highlight
ABSTRACT:
ORGANISM(S): Arabidopsis thaliana
PROVIDER: GSE237670 | GEO | 2024/07/25
REPOSITORIES: GEO
Similar Datasets
Project description:Plants monitor and integrate temperature, photoperiod and light quality signals to respond to continuous changes in their environment. The GIGANTEA (GI) protein is central in diverse signaling pathways, including photoperiodic, sugar and light signaling pathways, stress responses and circadian clock regulation. Previously, GI was shown to activate expression of the key floral regulators CONSTANS (CO) and FLOWERING LOCUS T (FT) by facilitating degradation of a family of CYCLING DOF FACTOR (CDF) transcriptional repressors. However, whether CDFs are implicated in other processes regulated by GI remains unclear. We investigated the contribution of the GI-CDF module to traits that depend on GI. Transcriptome profiling indicated that mutations in GI and the CDFs have antagonistic effects on expression of a wider set of genes than CO and FT, whilst other genes are regulated by GI independently of the CDFs. Detailed expression studies followed by phenotypic assays showed that the CDFs function downstream of GI to control responses to freezing temperatures and growth, but are not necessary for proper clock function. Thus GI-mediated regulation of CDFs contributes to several processes in addition to flowering, but is not implicated in all of the phenotypes influenced by GI. Seedlings of Col-0, the cdf1-R cdf2-1 cdf3-1 cdf5-1 quadruple mutant, gi-100 and gi-100 cdf1-R cdf2-1 cdf3-1 cdf5-1 quintuple mutant were grown for 10 days under LD conditions (16h light/8h dark). The aerial part of the seedlings was collected at ZT12 and RNA was prepared from three biological replicas
2015-07-31 | E-GEOD-59996 | biostudies-arrayexpress
Project description:GIGANTEA (GI) is an important modulator of plant circadian system. Recent studies have reported that protein GI is localized in both nucleus and cytosol, and nuclear and cytosolic GI exert differential effect on plant circadian clock. We first generated GI-null mutants and transgenic Arabidopsis plants that expressed GI fused to green fluorescent protein gene (GIpro::GI-GFP) and GI-GFP with a nuclear localization signal (GIpro::GI-GFP-NLS) or with a nuclear export signal (GIpro::GI-GFP-NES) under the control of native promoter in GI-null mutants. To investigate differential roles of nuclear and cytosolic GI in regulating plant circadian clock, we performed genome-wide gene expression profiling for wild-type plants and the GI-transgenic plants at morning and evening, and analyzed complementation patterns of gi-2 lesion by nuclear and cytosolic GI. As a result, we identified four complementation patterns representing genes affected by only nuclear GI (GIN) or cytosolic GI (GIC), those by either GIN or GIC, and those by the action of both GIN and GIC. Furthermore, we compared the transgenic plants expressing GIpro::GI-GFP with WT and the other GI-transgenic plants to confirm whether abnormally expressed genes by the gi-2 mutation can be complemented by restoring protein GI. Wild-type plants (Col), GI-null mutants (gi-2), and the other transgenic gi-2 plants expressing GIpro::GI-GFP (called GI plants), GIpro::GI-GFP-NLS (called GI-NLS plants), and GIpro::GI-GFP-NES (called GI-NES plants) were grown for seven days under conditions of 16 h light and 8 h dark (LD) and harvested at 1h (ZT1) and 16 hr (ZT16) after the light is turned on, representing morning and evening, respectively. mRNA levels were measured from three biological replicates of Col, gi-2, GI-NLS, GI-NES, and GI.
2013-09-01 | E-GEOD-47169 | biostudies-arrayexpress
Project description:Plants monitor and integrate temperature, photoperiod and light quality signals to respond to continuous changes in their environment. The GIGANTEA (GI) protein is central in diverse signaling pathways, including photoperiodic, sugar and light signaling pathways, stress responses and circadian clock regulation. Previously, GI was shown to activate expression of the key floral regulators CONSTANS (CO) and FLOWERING LOCUS T (FT) by facilitating degradation of a family of CYCLING DOF FACTOR (CDF) transcriptional repressors. However, whether CDFs are implicated in other processes regulated by GI remains unclear. We investigated the contribution of the GI-CDF module to traits that depend on GI. Transcriptome profiling indicated that mutations in GI and the CDFs have antagonistic effects on expression of a wider set of genes than CO and FT, whilst other genes are regulated by GI independently of the CDFs. Detailed expression studies followed by phenotypic assays showed that the CDFs function downstream of GI to control responses to freezing temperatures and growth, but are not necessary for proper clock function. Thus GI-mediated regulation of CDFs contributes to several processes in addition to flowering, but is not implicated in all of the phenotypes influenced by GI.
2015-07-31 | GSE59996 | GEO
Project description:The aim of this study was to analyze the impact of autotetraploidy on gene expression in Arabidopsis thaliana by comparing diploid versus tetraploid transcriptomes. In particular, this included the comparison of the transcriptome of different tetraploid A. thaliana ecotypes (Col-0 vs. Ler-0). The study was extended to address further aspects. One was the comparison of the transcriptomes in subsequent generations. This intended to obtain information on the genome wide stability of autotetraploid gene expression. Another line of work compared the transcriptomes of different diploid vs. tetraploid tissues. This aimed to investigate whether particular gene groups are specifically affected during the development of A. thaliana autotetraploids. Samples 1-8: Arabidopsis thaliana Col-0 tetraploid transcriptome. Transcriptional profiling and comparison of diploid vs. tetraploid Col-0 seedlings. The experiment was carried out with pedigree of independently generated and assessed tetraploid Col-0 lines. Samples 9-12: Arabidopsis thaliana Ler-0 tetraploid transcriptome. Transcriptional profiling and comparison of diploid vs. tetraploid Ler-0 seedlings. The experiment was carried out with pedigree of independently generated and assessed tetraploid Ler-0 lines. Samples 13-24: Arabidopsis thaliana Col-0 tetraploid transcriptome. Transcriptional profiling and comparison of diploid vs. tetraploid Col-0 leaves (6th - 8th). The experiment was carried out with pedigree of independently generated and assessed tetraploid Col-0 lines. Samples 25-32: Arabidopsis thaliana Ler-0 tetraploid transcriptome. Transcriptional profiling and comparison of diploid vs. tetraploid Ler-0 leaves (6th - 8th). The experiment was carried out with pedigree of independently generated and assessed tetraploid Ler-0 lines. Samples 33-36: Arabidopsis thaliana Ler-0 tetraploid transcriptome. Transcriptional profiling and comparison of tetraploid vs. tetraploid Ler-0 seedlings from the second (F2) and third (F3) generation after induction, respectively. The experiment was carried out with pedigree of independently generated and assessed tetraploid Ler-0 lines. Samples 37-40: Arabidopsis thaliana Col-0 tetraploid transcriptome. Transcriptional profiling and comparison of tetraploid vs. tetraploid Col-0 seedlings from the second (F2) and third (F3) generation after induction, respectively. The experiment was carried out with pedigree of independently generated and assessed tetraploid Col-0 lines. Samples 41-44: Arabidopsis thaliana Col-0/Ler-0 diploid transcriptome. Transcriptional profiling and comparison of diploid Col-0 vs. diploid Ler-0 seedlings. The experiment was carried out with pedigree of esrablished lines. Samples 45-48: Arabidopsis thaliana Col-0/Ler-0 tetraploid transcriptome. Transcriptional profiling and comparison of tetraploid Col-0 vs tetraploid Ler-0 seedlings. The experiment was carried out with pedigree of independently generated and assessed tetraploid Col-0 and Ler-0 lines.
2010-05-01 | GSE18482 | GEO
Project description:GIGANTEA (GI) is an important modulator of plant circadian system. Recent studies have reported that protein GI is localized in both nucleus and cytosol, and nuclear and cytosolic GI exert differential effect on plant circadian clock. We first generated GI-null mutants and transgenic Arabidopsis plants that expressed GI fused to green fluorescent protein gene (GIpro::GI-GFP) and GI-GFP with a nuclear localization signal (GIpro::GI-GFP-NLS) or with a nuclear export signal (GIpro::GI-GFP-NES) under the control of native promoter in GI-null mutants. To investigate differential roles of nuclear and cytosolic GI in regulating plant circadian clock, we performed genome-wide gene expression profiling for wild-type plants and the GI-transgenic plants at morning and evening, and analyzed complementation patterns of gi-2 lesion by nuclear and cytosolic GI. As a result, we identified four complementation patterns representing genes affected by only nuclear GI (GIN) or cytosolic GI (GIC), those by either GIN or GIC, and those by the action of both GIN and GIC. Furthermore, we compared the transgenic plants expressing GIpro::GI-GFP with WT and the other GI-transgenic plants to confirm whether abnormally expressed genes by the gi-2 mutation can be complemented by restoring protein GI.
2013-09-01 | GSE47169 | GEO
Project description:Arabidopsis thaliana (Col-0) seedlings were grown on vertically oriented agar plates and subjected to hypoxia (0.2% oxygen, 99.8% nitrogen) for 30 to 240 minutes.
2014-08-07 | GSE60133 | GEO
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2017-01-12 | GSE90077 | GEO
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Project description:Effect of the gi-2 mutation on Arabidopsis thaliana gene expression
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2016-11-16 | GSE89850 | GEO