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Chromatin landscapes in mouse haploid stem cells [RRBS-seq]

ABSTRACT: Chromatin landscapes in mouse haploid stem cells [RRBS-seq]

PROVIDER: PRJNA419891 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR6324130_1.fastq.gz	Fastqsanger.gz
	SRR6324130_2.fastq.gz	Fastqsanger.gz
	SRR6324129_1.fastq.gz	Fastqsanger.gz
	SRR6324129_2.fastq.gz	Fastqsanger.gz

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Chromatin landscapes in mouse haploid stem cells [RRBS-seq]

Project description:We generate histone modification profiles and DNA methylation profiles of mouse haploid embryonic stem cells. By comparison to mouse diploid ESCs and MEFs, we found the similar chromatin landscapes between haESCs and mESCs, which reveal the self-renew ability and pluripotency in haESCs. Besides, haESCs specific chromatin landscapes show its sperm-like functions.

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Chromatin landscapes in mouse haploid stem cells

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Project description:Mammalian haploid embryonic stem cells (haESCs) provide new possibilities for large-scale genetic screens because they bear only one copy of each chromosome. However, haESCs are prone to spontaneous diploidization through unknown mechanisms. Here, we report that a small molecule combination could restrain mouse haESCs from diploidization by impeding exit from naïve pluripotency and by shortening the S-G2/M phases. Combined with 2i and PD166285, our chemical cocktail could maintain haESCs in the haploid state for at least five weeks without fluorescence-activated cell sorting (FACS) enrichment of haploid cells. Taken together, we established an effective chemical approach for long-term maintenance of haESCs, and highlighted that proper cell cycle progression was critical for the maintenance of haploid state.

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Project description:Uniparental reproduction is widespread among lower vertebrates, but not in mammals. Researchers have produced bimaternal mice with a deletion of the H19 imprinted region. However, the mechanism of a single deletion in an immature oocyte sufficient to cross uniparental barriers is unknown. We found bimaternal-derived mice to be defective in multiple aspects. More importantly, bipaternal reproduction has not been achieved in mammals. Thus, the barrier of uniparental reproduction in mammals has not been elucidated. We identified a DNA hypomethylation status in haploid embryonic stem cells similar to that in primordial germ cells, with which bimaternal and bipaternal mice can be obtained by injection of haploid ES cells with genetic modifications. The phenotypic analyses of derived mice support the genetic conflict theory of genomic imprinting. Taken together, our results highlight the factors necessary for crossing uniparental reproduction barriers in mammals.

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