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Epigenomic profiling of SETX and Rloops in meiotic germ cells by CUT&Tag

ABSTRACT: Epigenomic profiling of SETX and Rloops in meiotic germ cells by CUT&Tag

PROVIDER: PRJNA933162 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR23381845_1.fastq.gz	Fastqsanger.gz
	SRR23381845_2.fastq.gz	Fastqsanger.gz
	SRR23381846_1.fastq.gz	Fastqsanger.gz
	SRR23381846_2.fastq.gz	Fastqsanger.gz
	SRR23381847_1.fastq.gz	Fastqsanger.gz

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Epigenomic profiling of SETX and Rloops in meiotic germ cells by CUT&Tag

Project description:SETX is a DNA/RNA helicase that resolves R-loop, and lack of SETX in germ cells causes meiotic arrest. To investigate roles of SETX in transcription during meiosis, we perfomred CUT&Tag of SETX and R-loops using antibodies against them.

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Epigenomic profiling of SETX in meiotic germ cells by ChIP-seq

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Epigenomic profiling of SETX in meiotic germ cells by ChIP-seq

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ADAD2 regulates heterochromatin in meiotic and post-meiotic male germ cells via translation of MDC1

Project description:Male germ cells establish a unique heterochromatin domain, the XY-body, early in meiosis. How this domain is maintained through the end of meiosis and into post-meiotic germ cell differentiation is poorly understood. ADAD2 is a late meiotic male germ cell specific RNA binding protein, loss of which leads to post-meiotic germ cell defects. Analysis of ribosome association in Adad2 mutants revealed defective translation of Mdc1, a key regulator of XY-body formation, late in meiosis. As a result, Adad2 mutants show normal establishment but failed maintenance of the XY-body. Observed XY-body defects are concurrent with abnormal autosomal heterochromatin and ultimately lead to severely perturbed post-meiotic germ cell heterochromatin and cell death. These findings highlight the requirement of ADAD2 for Mdc1 translation, the role of MDC1 in maintaining meiotic male germ cell heterochromatin, and the importance of late meiotic heterochromatin for normal post-meiotic germ cell differentiation.

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Project description:During spermatogenesis, mammalian spermatogonia undergo mitotic division, to maintain stem cell pool via self-renewal and generate differentiating progenitor cells for entry into meiotic prophase. During the perinatal stage, de novo DNA methylation occurring in pro-spermatogonia plays a key role to complete meiotic prophase and initiate meiotic division. In contrast, the role of the maintenance DNA methylation pathway for regulation of meiotic prophase, or meiotic division, in the adult is not well understood. Here, by using conditional mutants for Np95 (nuclear protein 95 kDa, also known as Uhrf1) or Dnmt1 [DNA (cytosine-5)-methyltransferase 1], two proteins that are essential for maintenance DNA methylation, we reveal that both NP95 and DNMT1 are co-expressed in spermatogonia and that these factors are necessary for meiosis in male germ cells. We found that Np95- or Dnmt1-deficient spermatocytes exhibited spermatogenic defects involving synaptic failure during meiotic prophase. In addition, assembly of pericentric heterochromatin clusters in early meiotic prophase, a phenomenon that is required for subsequent pairing of homologous chromosomes, is disrupted in Np95-deficient as well as Dnmt1-deficient spermatocytes. Based on these observations, we propose that DNA methylation established in pre-meiotic spermatogonia regulates synapsis of homologous chromosomes, and in turn quality control of male germ cells. Maintenance DNA methylation, therefore, plays a role to ensure faithful transmission of both genetic and epigenetic information to offspring.

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