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Chloroplast nucleoid is organized by membrane association of transcribed genes [ATAC]

ABSTRACT: Chloroplast nucleoid is organized by membrane association of transcribed genes [ATAC]

PROVIDER: PRJNA948855 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR23973403_1.fastq.gz	Fastqsanger.gz
	SRR23973403_2.fastq.gz	Fastqsanger.gz
	SRR23973404_1.fastq.gz	Fastqsanger.gz
	SRR23973404_2.fastq.gz	Fastqsanger.gz
	SRR23973405_1.fastq.gz	Fastqsanger.gz

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Project description:Chloroplasts are organelles responsible for photosynthesis. They originated form a procaryotic ancestor in the process of endosymbiosis and contain their own genomes. The chloroplast genome is packaged into a chromatin-like structure known as the nucleoid. The internal arrangement of the nucleoid, molecular mechanisms of DNA packaging and connection of the nucleoid structure to gene expression remain poorly understood. We show that Arabidopsis thaliana chloroplast nucleoids have a unique organization driven by DNA binding to the thylakoid membranes. Membrane association of specific DNA regions is correlated with high levels of transcription, high protein occupancy and reduced DNA accessibility. Genes with low levels of transcription are further away from the membranes, have lower protein occupancy and higher DNA accessibility. Gene-specific disruption of transcription in sigma factor mutants causes a corresponding reduction in membrane association, indicating that RNA polymerase activity causes DNA tethering to the membranes. We propose that transcription organizes the chloroplast nucleoid into a transcriptionally active membrane-associated core and a less active Periphery.

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