H3K27me3 epigenetic mark crucial for callus cell identity and regeneration capacity [RNA-seq]
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ABSTRACT:
PROVIDER: PRJNA1216562 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR32150770.fastq.gz | Fastqsanger.gz | |||
| SRR32150771.fastq.gz | Fastqsanger.gz | |||
| SRR32150772.fastq.gz | Fastqsanger.gz | |||
| SRR32150773.fastq.gz | Fastqsanger.gz | |||
| SRR32150774.fastq.gz | Fastqsanger.gz |
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Project description:Plant callus cells possess a remarkable ability to regenerate organs that often differ from their respective origins or even entire new individuals. Yet, the mechanisms underlying their pluripotent state remain elusive. We propose a strategy that involves two independent mechanisms to endow callus cells with pluripotency: (1) maintaining a unique transcriptional profile, characterised by the expression of genes from diverse developmental pathways that allows rapid response to developmental cues; (2) preventing premature differentiation through H3K27 methylation-mediated silencing of key transcription factors such as WUCHEL and SPEECHLESS. This strategy relies on a mechanism to silence the pluripotency network upon regenerative stimuli, enabling a single developmental pathway to dominate. Our study reveals that the EMF2 complex, a key regulator of H3K27 tri-methylation, plays a crucial role in this process. Callus derived from the emf2 mutant, deficient in H3K27me3, exhibits severely impaired regeneration. Comparative analyses of chromatin states and transcription profiles between wild-type and emf2 calli revealed that the loss of EMF2 leads to upregulation of key transcription factors in callus, and identified the genes regulated solely by EMF2. Our findings suggest that suppressing pluripotency networks through H3K27me3 is essential for executing specific developmental programs to ensure effective regeneration.
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Project description:Transcriptional profiling of age-related change of callus formation capability in Arabidopsis hypocotyls Organogenesis in vitro consists of many aspects such as phytohormone perception, dedifferentiation of differentiated cell to acquire organogenic competence, and re-entry of quiescent cells into cell cycle. In this study, we established an in vitro experimental system to study the age-dependent callus formation capacity in Arabidopsis. Interestingly, mature (35- to 38-day-old) hypocotyl explants exhibited better callus-forming potential than that of juvenile (7- to 10-day-old), determined by callus growth rates. To explore genome-wide expression changes underlying the phenomenon of age-dependent callus formation, a transcriptome-based analysis was performed. Gene expression profiling indicated that age-dependent callus formation capacity was associated with changes in phytohormone (auxins, cytokinins, abscisic acid, brassinosteroids and gibberellins) homeostasis, epigenetic mechanism and the cell cycle regulation. Besides, we identified two groups of genes involved in age-dependent callus formation capacity: (1) positive regulatory and (2) negative regulatory categories, i.e. genes that were significantly up- or down-regulated during callus formation derived from mature explants, respectively. One gene encoding DNA-binding protein (VARIANT IN METHYLATION 1, VIM1) belonging to the positive regulatory category was selected for functional analysis and assessment of age-dependent callus formation capacity. Indeed, vim1 reduced the efficiency of callus formation in mature explants, but not in juvenile. The result suggests that VIM1 plays an important role in regulating age-dependent callus formation capacity. Taken together, the investigation will help to better understand the molecular regulatory mechanism of age-dependent callus formation. Comparison of young and mature Arabidopsis hypocotyls either with or without auxin treatment for 1 day
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Project description:Repressive mark H3K27me3 in PRMT6 KO NT2/D1 cells
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Project description:Transcriptional profiling of age-related change of callus formation capability in Arabidopsis hypocotyls Organogenesis in vitro consists of many aspects such as phytohormone perception, dedifferentiation of differentiated cell to acquire organogenic competence, and re-entry of quiescent cells into cell cycle. In this study, we established an in vitro experimental system to study the age-dependent callus formation capacity in Arabidopsis. Interestingly, mature (35- to 38-day-old) hypocotyl explants exhibited better callus-forming potential than that of juvenile (7- to 10-day-old), determined by callus growth rates. To explore genome-wide expression changes underlying the phenomenon of age-dependent callus formation, a transcriptome-based analysis was performed. Gene expression profiling indicated that age-dependent callus formation capacity was associated with changes in phytohormone (auxins, cytokinins, abscisic acid, brassinosteroids and gibberellins) homeostasis, epigenetic mechanism and the cell cycle regulation. Besides, we identified two groups of genes involved in age-dependent callus formation capacity: (1) positive regulatory and (2) negative regulatory categories, i.e. genes that were significantly up- or down-regulated during callus formation derived from mature explants, respectively. One gene encoding DNA-binding protein (VARIANT IN METHYLATION 1, VIM1) belonging to the positive regulatory category was selected for functional analysis and assessment of age-dependent callus formation capacity. Indeed, vim1 reduced the efficiency of callus formation in mature explants, but not in juvenile. The result suggests that VIM1 plays an important role in regulating age-dependent callus formation capacity. Taken together, the investigation will help to better understand the molecular regulatory mechanism of age-dependent callus formation.
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Project description:Callus formation is usually a necessary step in regenerating a new plant from detached plant tissues, and the nature of the callus is similar to that of the root meristem. In this study, we intended to address the molecular basis that directs different plant tissues to form the root-meristem-like callus. We found that leaves, but not roots, of the Polycomb group (PcG) double mutant curly leaf-50 swinger-1 lost the ability to form a callus. Using ChIP-chip analysis, we identified genes that are changed markedly in the histone H3 lysine 27 trimethylation (H3K27me3) levels during callus formation from leaf explants. Among these genes, a number of leaf-regulatory genes were repressed through PcG-mediated H3K27me3. Conversely, certain auxin pathway genes and many root-regulatory genes were derepressed through H3K27 demethylation. Our data indicate that genome-wide H3K27me3 reprogramming, through the PcG-mediated H3K27me3 and the H3K27 demethylation pathways, is critical in directing cell fate transition. This submission represents the gene expression component of the study Leaves from 20-day-old seedlings of wild-type Col-0 and 20-DAC calli were used for RNA preparation.
2012-04-06 | E-GEOD-36479 | biostudies-arrayexpress
Project description:Callus formation is usually a necessary step in regenerating a new plant from detached plant tissues, and the nature of the callus is similar to that of the root meristem. In this study, we intended to address the molecular basis that directs different plant tissues to form the root-meristem-like callus. We found that leaves, but not roots, of the Polycomb group (PcG) double mutant curly leaf-50 swinger-1 lost the ability to form a callus. Using ChIP-chip analysis, we identified genes that are changed markedly in the histone H3 lysine 27 trimethylation (H3K27me3) levels during callus formation from leaf explants. Among these genes, a number of leaf-regulatory genes were repressed through PcG-mediated H3K27me3. Conversely, certain auxin pathway genes and many root-regulatory genes were derepressed through H3K27 demethylation. Our data indicate that genome-wide H3K27me3 reprogramming, through the PcG-mediated H3K27me3 and the H3K27 demethylation pathways, is critical in directing cell fate transition. This submission represents the gene expression component of the study
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