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Functional analysis of HD2C in Arabidopsis

ABSTRACT: Functional analysis of HD2C in Arabidopsis

PROVIDER: PRJNA421832 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR6364630.fastq.gz	Fastqsanger.gz
	SRR6364631.fastq.gz	Fastqsanger.gz
	SRR6364632.fastq.gz	Fastqsanger.gz
	SRR6364633.fastq.gz	Fastqsanger.gz
	SRR6364625.fastq.gz	Fastqsanger.gz

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Functional analysis of HD2C in Arabidopsis

Project description:Ribosome biogenesis is a fundamental process required for all cellular activities. Histone deacetylases play critical roles in many biological processes including transcriptional repression and rDNA silencing. However, their function in pre-rRNA processing remains poorly understood. Here, we discovered a previously uncharacterized role of Arabidopsis histone deacetylase HD2C in pre-rRNA processing via both canonical and non-canonical manners. HD2C interacts with HD2B and forms homo- and/or hetero-oligomers in the nucleolus. Depletion of HD2C and HD2B induces a ribosome biogenesis deficiency morphological phenotype and aberrant accumulation of 18S pre-rRNA intermediates. Our genome-wide analysis revealed that HD2C binds and represses the expression of key genes involved in ribosome biogenesis. Using RNA immunoprecipitation and sequencing, we further uncovered a non-canonical mechanism of HD2C directly associating with pre-rRNA and small nucleolar RNAs to regulate rRNA methylation. Together, this study reveals a multifaceted role of HD2C in ribosome biogenesis and provides mechanistic insights into how histone deacetylases modulate rRNA maturation at both transcriptional and post-transcriptional levels.

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Espression data of control and heat-stressed Arabidopsis WT, hd2c-3, brm-1 and brm-1 hd2c-3 plants

Project description:Studies in yeast and animals have revealed that histone deacetylases (HDACs) often act as components of multiprotein complexes, including chromatin remodeling complexes (CRCs). In our group, we found evidence for the interaction between Arabidopsis HD2C deacetylase and a BRM-containing SWI/SNF chromatin remodeling complex. Moreover, we revealed a novel function of HD2C as a regulator of the heat stress response. HD2C transcript levels were strongly induced in plants subjected to heat treatment and the expression of selected heat-responsive genes was up-regulated in heat-stressed hd2c mutant, suggesting that HD2C acts to down-regulate heat-activated genes. Microarray transcriptome analysis of brm and hd2c mutants identified a subset of commonly regulated heat-responsive genes, and the effect of the double brm hd2c mutation on the expression of these genes was non-additive. Moreover, heat treated hd2c, brm and brm hd2c mutants displayed similar rates of growth retardation. Taken together, our findings suggest that HD2C and BRM act in a common genetic pathway to regulate the Arabidopsis heat stress response.

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