Arabidopsis thaliana
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ABSTRACT:
PROVIDER: PRJNA115715 | ENA |
REPOSITORIES: ENA
Similar Datasets
Project description:Arabidopsis thaliana seedlings:early light regulated gene expression in Ler wildtype versus eid3 mutant
| PRJNA148165 | ENA
Project description:Light- and plastid-regulated transcriptomes in Arabidopsis seedlings
| PRJNA132599 | ENA
Project description:Gene expression from Arabidopsis under high light conditions
| PRJNA127985 | ENA
Project description:ABP1-regulated gene expression in etiolated Arabidopsis seedlings
| PRJNA198018 | ENA
Project description:Photoperiod is a circannual signal measured by biological systems to align growth and reproduction with the seasons. To understand the effect of photoperiod of gene expression in Arabidopsis thaliana in the absence of exogenous sugar under constant light intensity, we performed time course mRNA-seq analysis on 13-day old seedlings across three photoperiods with triplicates to identify photoperiod-regulated genes.
2023-08-15 | GSE221846 | GEO
Project description:Although landscapes of several epigenetic marks are now available for Arabidopsis and rice, such profiles remain static and do not provide information about dynamic changes of plant epigenomes in response to developmental or environmental cues. Here we analyzed the effects of light regulation on four epigenetic histone modifications (H3K9ac, H3K9me3, H3K27ac, H3K27me3). Our genome-wide profiling of H3K9ac and H3K27ac revealed that these modifications are gene-specific. In contrast, we found that H3K9me3 and H3K27me3 target genes, but also intergenic-regions and transposable elements. Specific light conditions affected the number of epigenetically modified regions, as well as the overall correlation strength between the presence of specific epigenetic modifications and transcription. Futhermore, we observed that acetylation is an important contributor to light-regulated genome expression not only through its activating action on HY5 and HYH but also on their downstream targets. We found that dynamic acetylation changes in response to light have a major role in the active regulation of photosynthetic gene expression, while H3K27ac and H3K27me3 are major contributors to light regulation of the gibberellin metabolism. We also identified distinct epigenetic patterns in the epigenome of the photomorphogenic mutant cop1-4, suggesting that COP1 might have a role in the establishment of specific epigenetic modifications. Thus, this work provides a dynamic portrait of the variations in histone modifications in response to the plant’s changing light environment and strengthens the concept that epigenetic modifications represent another layer of control for light-regulated genes involved in photomorphogenesis.
2009-12-30 | GSE15597 | GEO
Project description:Epigenetic regulation of light-induced anthocyanin biosynthesis by IBM1 histone demethylase in Arabidopsis
| PRJNA415344 | ENA
Project description:In plants, reactive oxygen species and, more particularly, hydrogen peroxide (H2O2) play a dual role as toxic by-products of normal cell metabolism and as regulatory molecules in stress perception and signal transduction. Peroxisomal catalases are an important sink for photorespiratory H2O2. Using ATH1 Affymetrix microarrays, expression profiles were compared between control and catalase-deficient Arabidopsis (Arabidopsis thaliana) plants. Reduced catalase levels already provoked differences in nuclear gene expression under ambient growth conditions, and these effects were amplified by high light exposure in a sun simulator for 3 and 8 h. This genome-wide expression analysis allowed us to reveal the expression characteristics of complete pathways and functional categories during H2O2 stress. In total, 349 transcripts were significantly up-regulated by high light in catalase-deficient plants and 88 were down-regulated. From this data set, H2O2 was inferred to play a key role in the transcriptional up-regulation of small heat shock proteins during high light stress. In addition, several transcription factors and candidate regulatory genes involved in H2O2 transcriptional gene networks were identified. Comparisons with other publicly available transcriptome data sets of abiotically stressed Arabidopsis revealed an important intersection with H2O2-deregulated genes, positioning elevated H2O2 levels as an important signal within abiotic stress-induced gene expression. Finally, analysis of transcriptional changes in a combination of a genetic (catalase deficiency) and an environmental (high light) perturbation identified a transcriptional cluster that was strongly and rapidly induced by high light in control plants, but impaired in catalase-deficient plants. This cluster comprises the complete known anthocyanin regulatory and biosynthetic pathway, together with genes of hitherto unknown function.
2005-10-11 | E-MEXP-449 | biostudies-arrayexpress
Project description:Injured plant somatic tissues regenerate themselves by establishing the shoot or root meristems. In Arabidopsis (Arabidopsis thaliana) a two-step culture system ensures regeneration by first promoting the acquisition of pluripotency and subsequently specifying the fate of new meristems. Although previous studies have reported the importance of phytohormones auxin and cytokinin in determining the fate of new meristems, it remains elusive whether and how the environmental factors influence this process. In this study, we investigated the impact of light signals on shoot regeneration using Arabidopsis hypocotyl as explants. We found that light signals promote shoot regeneration while inhibiting root formation. ELONGATED HYPOCOTYL 5 (HY5), the pivotal transcriptional factor in light signaling, plays a central role in this process by mediating the expression of key genes controlling the fate of new meristems. Specifically, HY5 directly represses root development genes and activates shoot meristem genes, leading to the establishment of shoot progenitor from pluripotent callus. We further demonstrated that the early activation of photosynthesis is critical for shoot initiation, and this is transcriptionally regulated downstream of the HY5-dependent pathways. In conclusion, we uncovered the intricate molecular mechanisms by which light signals control the establishment of new meristem through the regulatory network governed by HY5, thus, highlighting the influence of light signals on plant developmental plasticity.
2024-09-16 | GSE236147 | GEO
Project description:Selection of epigenetic variation in Arabidopsis [Expression]
| PRJNA156955 | ENA