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High-resolution mapping of ribosome footprints from Arabidopsis thaliana

ABSTRACT: Post-transcriptional gene regulation plays a significant role in the response to oxygen deprivation. Here, we utilized advances in next-generation sequencing technology to examine changes in transcriptional control, mRNA loading on to polysome, and regulation of ribosome activity during mRNA translation in 7-day-old Arabidopsis seedlings subjected to 2 hour hypoxia treatment.

ORGANISM(S): Arabidopsis thaliana

PROVIDER: GSE50597 | GEO | 2013/11/23

SECONDARY ACCESSION(S): PRJNA218027

REPOSITORIES: GEO

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High-resolution mapping of ribosome footprints from Arabidopsis thaliana

Project description:Post-transcriptional gene regulation plays a significant role in the response to oxygen deprivation. Here, we utilized advances in next-generation sequencing technology to examine changes in transcriptional control, mRNA loading on to polysome, and regulation of ribosome activity during mRNA translation in 7-day-old Arabidopsis seedlings subjected to 2 hour hypoxia treatment. 14 samples, 2 conditions (2 hr hypoxia and 2 hr normoxia), 2 bioreplicates of 3 RNA pools (total mRNA, immunopurified (TRAP) polysomal mRNA, ribosome footprints), 1 bioreplicate of 1 RNA pool (immunopurified (TRAP)-ribosome footprints).

2013-11-23 | E-GEOD-50597 | biostudies-arrayexpress

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Ribosome footprinting in the cytosol and endoplasmic reticulum

Project description:In eukaryotic cells, the spatial regulation of protein expression is frequently conferred through the coupling of mRNA localization and the local control of translation. mRNA localization to the endoplasmic reticulum (ER) is a prominent example of such regulation and serves a ubiquitous role in segregating the synthesis of secretory and integral membrane proteins to the ER. Recent genomic and biochemical studies have now expanded this view to suggest a role for the ER in global protein synthesis. We have utilized cell fractionation and ribosome profiling to obtain a genomic survey of the subcellular organization of mRNA translation and report that ribosomal loading of mRNAs, a proxy for mRNA translation, is biased to the ER. Notably, ER-associated mRNAs encoding both cytosolic and topogenic signal-encoding proteins display similar ribosome loading densities, suggesting that ER-associated ribosomes serve a global role in mRNA translation. We propose that the partitioning of mRNAs and their translation between the cytosol and ER compartments may represent a novel mechanism for the post-transcriptional regulation of gene expression. HEK293 cells were fractionated between the cytosol and endoplasmic reticulum. Within each fraction, ribosome footprints were generated and sequenced. In parallel, total mRNA was sequenced.

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Transcript levels in Arabidopsis thaliana over a 24-hour diurnal cycle

Project description:Circadian control of gene expression has been established in plants at the transcriptional level, but relatively little is known about circadian control of translation. We used polysome profiling to characterize regulation of transcription and translation over a 24-hour diurnal cycle in Arabidopsis, both in wild type and in plants with a disrupted clock due to constitutive overexpression of the CIRCADIAN CLOCK ASSOCIATED 1 gene (CCA1-ox, AGI AT2G46830).

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