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Targeted reprogramming of H3K27me3 resets epigenetic memory in plant paternal chromatin

ABSTRACT: Targeted reprogramming of H3K27me3 resets epigenetic memory in plant paternal chromatin

PROVIDER: PRJNA494054 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR10166243.fastq.gz	Fastqsanger.gz
	SRR10166244.fastq.gz	Fastqsanger.gz
	SRR10166245.fastq.gz	Fastqsanger.gz
	SRR10166246.fastq.gz	Fastqsanger.gz
	SRR10166247.fastq.gz	Fastqsanger.gz

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Targeted reprogramming of H3K27me3 resets epigenetic memory in plant paternal chromatin

Project description:Targeted reprogramming of H3K27me3 resets epigenetic memory in plant paternal chromatin

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Targeted reprogramming of H3K27me3 resets epigenetic memory in plant paternal chromatin [mature pollen]

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Targeted reprogramming of H3K27me3 resets epigenetic memory in plant paternal chromatin [sperm]

Project description:Epigenetic marks are reprogrammed in the gametes to reset genomic potential in the next generation. In mammals, paternal chromatin is extensively reprogrammed through the global erasure of DNA methylation and the exchange of histones with protamines1,2. Precisely how the paternal epigenome is reprogrammed in flowering plants remains unclear since DNA is not demethylated in sperm and histones are retained3,4. Here, we describe a multi-layered mechanism by which H3K27me3 is globally lost from histone-based sperm chromatin in Arabidopsis. This mechanism involves silencing of H3K27me3 ‘writers’, the activity of H3K27me3 ‘erasers’ and deposition of a sperm-specific histone, H3.105, which we show is immune to lysine 27 methylation. The loss of H3K27me3 facilitates transcription of genes essential for spermatogenesis and pre-configures sperm with a chromatin state that forecasts gene expression in the next generation. Thus, plants have evolved a specific mechanism to simultaneously differentiate male gametes and reprogram the paternal epigenome.

2020-03-17 | GSE144899 | GEO

Targeted reprogramming of H3K27me3 resets epigenetic memory in plant paternal chromatin

Project description:Epigenetic marks are reprogrammed in the gametes to reset genomic potential in the next generation. In most animal species, paternal chromatin is extensively reprogrammed through the global erasure of DNA methylation and the exchange of histones with protamine. Precisely how the paternal epigenome is reprogrammed in flowering plants remains unclear since sperm chromatin is not demethylated and histones are retained. Here, we show that the sperm-specific histone, H3.10, is immune to lysine 27 methylation and that its deposition in sperm contributes to the global and specific resetting of the epigenetic mark H3K27me3 by uncoupling its inheritance during DNA replication. The loss of H3K27me3 facilitates transcription of genes essential for spermatogenesis and pre-configures sperm with a chromatin state that forecasts gene expression in the next generation, revealing a global wave of epigenetic resetting that coordinates with early plant life. Thus, in contrast to the indiscriminate removal of epigenetic marks in animal sperm, plants have evolved a specific mechanism to simultaneously differentiate male gametes and reprogram the paternal epigenome.

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Targeted reprogramming of H3K27me3 resets epigenetic memory in plant paternal chromatin

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Targeted reprogramming of H3K27me3 resets epigenetic memory in plant paternal chromatin.

Project description:Epigenetic marks are reprogrammed in the gametes to reset genomic potential in the next generation. In mammals, paternal chromatin is extensively reprogrammed through the global erasure of DNA methylation and the exchange of histones with protamines1,2. Precisely how the paternal epigenome is reprogrammed in flowering plants has remained unclear since DNA is not demethylated and histones are retained in sperm3,4. Here, we describe a multi-layered mechanism by which H3K27me3 is globally lost from histone-based sperm chromatin in Arabidopsis. This mechanism involves the silencing of H3K27me3 writers, activity of H3K27me3 erasers and deposition of a sperm-specific histone, H3.10 (ref. 5), which we show is immune to lysine 27 methylation. The loss of H3K27me3 facilitates the transcription of genes essential for spermatogenesis and pre-configures sperm with a chromatin state that forecasts gene expression in the next generation. Thus, plants have evolved a specific mechanism to simultaneously differentiate male gametes and reprogram the paternal epigenome.

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