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Germ cells

ABSTRACT: germ cells

PROVIDER: PRJNA682749 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR13190102_1.fastq.gz	Fastqsanger.gz
	SRR13190102_2.fastq.gz	Fastqsanger.gz
	SRR13190103_1.fastq.gz	Fastqsanger.gz
	SRR13190103_2.fastq.gz	Fastqsanger.gz
	SRR13190104_1.fastq.gz	Fastqsanger.gz

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In vivo epigenomic profiling of germ cells reveals germ cell molecular signatures [ChIP-Seq]

Project description:The limited number of in vivo germ cells poses an impediment to genome-wide studies. Here, we applied a small-scale ChIP-Seq method on purified mouse fetal germ cells to generate genome-wide maps of four histone modifications (H3K4me3, H3K27me3, H3K27ac and H2BK20ac), facilitating the identification of active and repressed cis-regulatory elements in germ cells in vivo. Comparison of active chromatin state between somatic, embryonic stem cells (ESC) and germ cells revealed promoters and enhancers needed for stem cell maintenance and germ cell development. The nuclear receptor Nr5a2 motif is enriched at a subset of cis-regulatory regions and we confirm its role in germ cell differentiation. Interestingly, germ cells have comparatively more H3K27me3-marked sites that are absent in ESC and other somatic cell types. These repressed regions are enriched for retrotransposons and MHC genes and this indicates that these loci are specifically silenced in germ cells. Together, our study provides the first genome-wide histone modification maps of in vivo germ cells and revealed the molecular chromatin signatures unique to germ cells. Germ cells were FACS-purified from gonadal single cell suspension based on Pou5f1-GFP expression. ChIP-seq of Histone modification was done for two timepoints in this study: E11.5 (male/female), E13.5 (male). For E13.5 timepoint, two biological replicates were analyzed. In order to validate small scale ChIP-seq method limited number of ES cells were used to check consistency of ChIP-seq data.

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Tdrd6a recruits Ziwi-bound piRNAs and coordinates deposition of germ plasm mRNAs into primordial germ cells [small RNA]

Project description:Germ plasm, the Balbiani body and nuage are evolutionary conserved structures essential for germ cell specification and maintenance. We describe Tdrd6a as a component of these structures with two distinct molecular functions. First, Tdrd6a facilitates the accumulation of the typical antisense-bias of piRNAs, without having effects on piRNA biogenesis signatures. Second, we show that Tdrd6a is required for Balbiani body and germ plasm integrity, and associates with RNA-binding proteins and germ plasm mRNAs. On the cell-biological level, maternally contributed Tdrd6a strongly impacts germ cell formation, but is dispensable for fertility. Using single-cell RNA-sequencing we demonstrate that Tdrd6a promotes early germ cell development and regulates the stoichiometry of germ plasm mRNAs. We propose that Tdrd6a functions as a scaffold to recruit correct ratios of germ plasm transcripts and to accumulate antisense piRNA complexes in order to ensure both specification and maintenance of germ cells.

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