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Arabidopsis thaliana

ABSTRACT: Unique cell-type specific patterns of DNA methylation in the root meristem (MethylC-seq)

PROVIDER: PRJNA316812 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR3311820.fastq.gz	Fastqsanger.gz
	SRR3311821.fastq.gz	Fastqsanger.gz
	SRR3311822.fastq.gz	Fastqsanger.gz
	SRR3311824.fastq.gz	Fastqsanger.gz
	SRR3311825.fastq.gz	Fastqsanger.gz

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Arabidopsis thaliana

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Project description:DNA methylation is an epigenetic modification that differs between plant organs and tissues, but the extent of variation between cell types is not known. Here, we report single-base resolution whole genome DNA methylomes, mRNA transcriptomes, and small RNA transcriptomes for six cell populations covering the major cell types of the Arabidopsis root meristem. We identify widespread cell type specific patterns of DNA methylation, especially in the CHH sequence context. The genome of the columella root cap is the most highly methylated Arabidopsis cell characterized to date. It is hypermethylated within transposable elements, accompanied by increased abundance of transcripts encoding RNA-directed DNA methylation (RdDM) pathway components and 24 nt small RNAs. Absence of the nucleosome remodeler DECREASED DNA METHYLATION 1, required for maintenance of DNA methylation, and low abundance of histone transcripts involved in heterochromatin formation suggests a loss of heterochromatin may occur in the columella, thus allowing access of RdDM factors to the whole genome, and producing excess 24 nt small RNAs in this tissue. Together, these maps provide new insights into the epigenomic diversity that exists between distinct plant somatic cell types. MethylC-seq from six cell populations covering the major cell types of the Arabidopsis root meristem.

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Project description:This experiment was set up in order to identify the (direct) transcriptional targets of the Ethylene Response Factor 115 (ERF115) transcription factor. Because ERF115 expression occurs in quiescent center (QC) cells and strong effects on the QC cells were observed in ERF115 overexpression plants, root tips were harvested for transcript profiling in order to focus on root meristem and QC specific transcriptional targets. Wild-type (Col-0 ecotype), erf115 mutant (SALK_021981) and ERF115 overexpressing (p35S:ERF115 ORF) root tips (three replicates each) were harvested and subjected to transcript profiling, using the Col-0 samples as control reference.

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