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ChIP-seq experiment of PHF2 and H3K9me2 in NSCs

ABSTRACT: ChIP-seq experiment of PHF2 and H3K9me2 in NSCs

PROVIDER: PRJNA504430 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR8170890.fastq.gz	Fastqsanger.gz
	SRR8170891.fastq.gz	Fastqsanger.gz
	SRR8170892.fastq.gz	Fastqsanger.gz
	SRR8170894.fastq.gz	Fastqsanger.gz

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ChIP-seq experiment of PHF2 and H3K9me2 in NSCs

Project description:Histone H3 lysine 9 methylation (H3K9me) is essential for cellular homeostasis; however, its contribution to development is not well established. Here, we demonstrate that the H3K9me2 demethylase PHF2 is essential for neural progenitor proliferation in vitro and for early neurogenesis in the chicken spinal cord. Using genome-wide analyses and biochemical assays we show that PHF2 controls the expression of critical cell cycle progression genes, particularly those related to DNA replication, by keeping low levels of H3K9me3 at promoters. Accordingly, PHF2 depletion induces R-loop accumulation that leads to extensive DNA damage and cell cycle arrest. These data reveal a role of PHF2 as a guarantor of genome stability that allows proper expansion of neural progenitors during development.

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Project description:Heterochromatin stability is crucial for progenitor proliferation during development. It relays on the maintenance of local hubs of H3K9me. However, the mechanisms underlying the establishment of competent local levels of H3K9me remain poorly understood. To address this intriguing question, we used a neural stem cell (NSC) model to analyze the significance of the H3K9me2 demethylase PHF2, which is crucial for progenitor proliferation. Through mass spectroscopy and genome-wide assays, we uncovered that PHF2 interacts with heterochromatin components and it is enriched at pericentromeric heterochromatin (PcH) boundaries. This binding is essential for maintaining silenced the satellite repeats and to prevent DNA damage and genome instability. To do that, PHF2 balances H3K9me3 levels at these boundaries to ensure high H3K9me3 levels at satellite repeats. Mechanistically, we discover that while its catalytic and PHD domains are indispensable, the intrinsically disordered region within PHF2 is dispensable for stabilizing PcH. Altogether, our study sheds light on the intricate relationship between heterochromatin stability and progenitor proliferation during mammalian neurogenesis.

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