Expression data in Arabidopsis upf1-1 and upf3-1 mutants.
Ontology highlight
ABSTRACT:
ORGANISM(S): Arabidopsis thaliana
PROVIDER: GSE12101 | GEO | 2009/01/14
SECONDARY ACCESSION(S): PRJNA113789
REPOSITORIES: GEO
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Project description:The nonsense-mediated mRNA decay pathway (NMD) is a quality control mechanism that detects and degrades mRNAs that contain premature translation termination codons (PTCs), thus preventing the production of potentially harmful truncated proteins. NMD has been studied in a number of organisms including humans, yeast, Drosophila, C. elegans and recently Arabidopsis. Recently the NMD process has been shown to have a wider significance in regulating the levels of mRNA expression for a wide range of genes in yeast and Drosophila. Several genes have been found to be required for NMD in a variety of organisms, including UPF1 and UPF3. We have identified and characterised a number of alleles of UPF1 and UPF3 in Arabidopsis that are defective in NMD. By doing a transcriptomic analysis of two NMD mutants, upf1-1 and upf3-1, and wild type plants we aim to identify the subset of genes that are co-regulated by UPF1 and UPF3 and, therefore, by NMD in Arabidopsis. RNA will be extracted from 17-day-old mutant and wild type seedlings grown at 22-24 C under constant light.
2010-07-09 | GSE19253 | GEO
Project description:The nonsense-mediated mRNA decay pathway (NMD) is a quality control mechanism that detects and degrades mRNAs that contain premature translation termination codons (PTCs), thus preventing the production of potentially harmful truncated proteins. NMD has been studied in a number of organisms including humans, yeast, Drosophila, C. elegans and recently Arabidopsis. Recently the NMD process has been shown to have a wider significance in regulating the levels of mRNA expression for a wide range of genes in yeast and Drosophila. Several genes have been found to be required for NMD in a variety of organisms, including UPF1 and UPF3. We have identified and characterised a number of alleles of UPF1 and UPF3 in Arabidopsis that are defective in NMD. By doing a transcriptomic analysis of two NMD mutants, upf1-1 and upf3-1, and wild type plants we aim to identify the subset of genes that are co-regulated by UPF1 and UPF3 and, therefore, by NMD in Arabidopsis. RNA will be extracted from 17-day-old mutant and wild type seedlings grown at 22-24 C under constant light. 7 samples were used in this experiment.
2010-07-09 | E-GEOD-19253 | biostudies-arrayexpress
Project description:Expression data in Arabidopsis upf1-1 and upf3-1 mutants.
| PRJNA113789 | ENA
Project description:Eukaryotic cells have evolved a mechanism called nonsense mediated mRNA decay (NMD) that detects and degrades aberrant mRNAs that contain premature termination codons (PTCs). NMD has recently acquired broader importance as it has been found to regulate not only aberrant mRNAs but also a great diversity of transcripts, including wild type genes in mammals, Drosophila and yeast. Seven proteins are the core of the NMD complex: SMG1, SMG2 (UPF1), SMG3 (UPF2), SMG4 (UPF3), SMG5, SMG6 and SMG7. Plants have orthologues of most of these proteins. We have identified and characterized a number of alleles of UPF1, UPF3 and SMG5 and made 35S:UPF2 RNAi (upf2i) transgenic plants, all of which share some phenotypic characteristics. Transcriptome analysis of upf1 and upf3 mutants has identified a subset of genes coregulated by UPF1 and UPF3 and, therefore, by NMD (unpublished data). By doing further transcriptome analysis on smg5 mutants and upf2i plants we aim to build a more robust subset of NMD targets in Arabidopsis. RNA will be extracted from 17 day-old mutant, transgenic and wild type seedlings grown at 22-24 C under constant light. 6 samples were used in this experiment
2011-10-06 | E-GEOD-32671 | biostudies-arrayexpress
Project description:Eukaryotic cells have evolved a mechanism called nonsense mediated mRNA decay (NMD) that detects and degrades aberrant mRNAs that contain premature termination codons (PTCs). NMD has recently acquired broader importance as it has been found to regulate not only aberrant mRNAs but also a great diversity of transcripts, including wild type genes in mammals, Drosophila and yeast. Seven proteins are the core of the NMD complex: SMG1, SMG2 (UPF1), SMG3 (UPF2), SMG4 (UPF3), SMG5, SMG6 and SMG7. Plants have orthologues of most of these proteins. We have identified and characterized a number of alleles of UPF1, UPF3 and SMG5 and made 35S:UPF2 RNAi (upf2i) transgenic plants, all of which share some phenotypic characteristics. Transcriptome analysis of upf1 and upf3 mutants has identified a subset of genes coregulated by UPF1 and UPF3 and, therefore, by NMD (unpublished data). By doing further transcriptome analysis on smg5 mutants and upf2i plants we aim to build a more robust subset of NMD targets in Arabidopsis. RNA will be extracted from 17 day-old mutant, transgenic and wild type seedlings grown at 22-24 C under constant light.
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Project description:Plants generally possess a strong ability to regenerate organs; for example, in tissue culture, shoots can regenerate from callus, a clump of actively proliferating, undifferentiated cells. Processing of pre-mRNA and ribosomal RNAs is important for callus formation and shoot regeneration. However, our knowledge of the roles of RNA quality control via the nonsense-mediated mRNA decay (NMD) pathway in shoot regeneration is limited. Here, we examined the shoot regeneration phenotypes of the low-beta-amylase1 (lba1)/upstream frame shift1-1 (upf1-1) and upf3-1 mutants, in which the core NMD components UPF1 and UPF3 are defective. These mutants formed callus from hypocotyl explants normally, but this callus behaved abnormally during shoot regeneration: the mutant callus generated numerous adventitious root structures instead of adventitious shoots in an auxin-dependent manner. Quantitative RT-PCR and microarray analyses showed that the upf mutations had widespread effects during culture on shoot-induction medium. In particular, the expression patterns of early auxin response genes, including those encoding AUXIN/INDOLE ACETIC ACID (AUX/IAA) family members, were significantly affected in the upf mutants. Also, the upregulation of shoot apical meristem-related transcription factor genes, such as CUP-SHAPED COTYLEDON1 (CUC1) and CUC2, was inhibited in the mutants. Taken together, these results indicate that NMD-mediated transcriptomic regulation modulates the auxin response in plants and thus plays crucial roles in the early stages of shoot regeneration.
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