PGC7 and TET3 ChIP-seq results
Ontology highlight
ABSTRACT:
ORGANISM(S): Homo sapiens
PROVIDER: GSE53809 | GEO | 2014/01/04
SECONDARY ACCESSION(S): PRJNA233405
REPOSITORIES: GEO
Similar Datasets
Project description:PGC7 is a primordial germ cell (PGCs)-specific protein involved in epigenetic chromatin reprogramming in the zygote following fertilization. TET3 is a dioxygenase that catalyzes the conversion of the modified genomic base 5-methylcytosine (5mC) into 5-hydroxymethylcytosine (5hmC) and plays a key role in epigenetic chromatin reprogramming in the zygote following fertilization. PGC7 participates in protection of DNA methylation in the maternal pronucleus by preventing conversion of 5mC to 5hmC by TET3 oxidization subsequent DNA demethylation. Thus we tested the co-localization of PGC7 and TET3 in specific loci by ChIP-seq assays.
2014-01-04 | E-GEOD-53809 | biostudies-arrayexpress
Project description:Fertilization triggers a global erasure of 5-methylcytosine from paternal DNA as part of extensive epigenetic reprogramming during the transition from gametic specialization to totipotency. This active removal has been shown to involve oxidation by TET3, but the targeting of this pathway and the wider context of demethylation remain poorly understood. We optimized a novel technique for whole-genome bisulfite sequencing and applied it to wild-type and TET3-deficient zygotes, using SNPs to access paternal alleles. As the great majority of sperm-contributed methylation lies outside the CpG islands (CGIs) and promoters analysed to date, these genome-wide methylation profiles allow paternal methylation trajectories in the zygote to be comprehensively examined for the first time. This global view revealed that in addition to pervasive loss of methylation from intergenic sequences and most repetitive elements, gene bodies constitute a major target of zygotic demethylation. Methylation loss is associated with zygotic genome activation, and at gene bodies is also linked to increased transcriptional noise in the early embryo. Our data maps the primary contribution of oxidative demethylation to a subset of gene bodies and single-copy intergenic sequences, and implicates the action of redundant pathways at many loci. We further uncover a novel function for TET3 in protection from de novo methylation at CGIs and promoters. This work adds new breadth to our understanding of the molecular events involved in reprogramming gametic identity following fertilization. Three independent collections of zygotes were performed for each genotype (control and TET3 deletion), giving a total of 225 control and 237 TET3 deletion zygotes, of which 120 and 129 were derived from 129S2/SvHsd studs for control and TET3 samples, respectively. Zygotes were pooled and whole-genome bisulfite libraries were prepared using a post-bisulfite adaptor tagging strategy optimized from (Miura et al. Nucleic Acids Research 2012, 40:e136)
2014-12-22 | E-GEOD-63417 | biostudies-arrayexpress
Project description:Fertilization triggers a global erasure of 5-methylcytosine from paternal DNA as part of extensive epigenetic reprogramming during the transition from gametic specialization to totipotency. This active removal has been shown to involve oxidation by TET3, but the targeting of this pathway and the wider context of demethylation remain poorly understood. We optimized a novel technique for whole-genome bisulfite sequencing and applied it to wild-type and TET3-deficient zygotes, using SNPs to access paternal alleles. As the great majority of sperm-contributed methylation lies outside the CpG islands (CGIs) and promoters analysed to date, these genome-wide methylation profiles allow paternal methylation trajectories in the zygote to be comprehensively examined for the first time. This global view revealed that in addition to pervasive loss of methylation from intergenic sequences and most repetitive elements, gene bodies constitute a major target of zygotic demethylation. Methylation loss is associated with zygotic genome activation, and at gene bodies is also linked to increased transcriptional noise in the early embryo. Our data maps the primary contribution of oxidative demethylation to a subset of gene bodies and single-copy intergenic sequences, and implicates the action of redundant pathways at many loci. We further uncover a novel function for TET3 in protection from de novo methylation at CGIs and promoters. This work adds new breadth to our understanding of the molecular events involved in reprogramming gametic identity following fertilization.
2014-12-22 | GSE63417 | GEO
Project description:The epigenomes of mammalian sperm and oocytes, characterized by gamete-specific 5-methylcytosine (5mC) patterns, are reprogrammed in early embryogenesis to establish full developmental potential. It is broadly accepted that the paternal genome is actively demethylated in the zygote while the maternal genome undergoes passive demethylation thanks to DNA replication over the subsequent cleavage divisions. Here we reveal that both maternal and paternal genomes undergo widespread active and passive demethylation in the pronuclear zygote before the first mitotic division. Whereas the passive demethylation requires DNA replication, the active demethylation relies on enzymatic oxidation of 5mC, as deletion of the DNA dioxygenase, Tet3, but not the inhibition of replication, blocks the active demethylation. At actively demethylated loci, 5mCs appear to be processed to unmodified cytosines in a manner independent of the DNA glycosylase TDG. These observations suggest the occurrence of genuine active demethylation in both parental genomes following fertilization. An extra supportive Tet3 knock-out female pronuclear sample related to experiment Series GSE56650.
2016-09-01 | E-GEOD-60777 | biostudies-arrayexpress
Project description:Dynamic DNA methylation and demethylation regulate gene expression during development. While DNA methyltransferases (DNMTs) establish and maintain cytosine methylation patterns, Ten-eleven translocation (Tet) dioxygenases catalyze sequential oxidation of 5-methylcytosine (5mC) to promote demethylation. Target-specific 5mC oxidation requires precise regulation of the Tet enzymatic activity. However, the mechanism underlying their activity control remains largely unexplored. Here we show a large low-complexity domain (LCD), present within the catalytic domain of Tet3, functions to repress the dioxygenase activity. Recombinant LCD-deleted Tet3 exhibits enhanced activity to convert 5mC into oxidized species. Deletion of the Tet3 LCD in mouse oocytes renders 5mC oxidation indiscriminately across the genome, leading to most prominently the derepression of ERVK retrotransposons and upregulation of adjacent genes. The extensive 5mC oxidation is associated with impairments in oocyte development. These findings suggest an intrinsic auto-regulatory mechanism of Tet3 dioxygenase operating to ensure a tight regulation of its enzymatic activity to achieve spatiotemporal specificity of methylome reprogramming during oocyte development.
2023-08-24 | GSE222500 | GEO
Project description:Dynamic DNA methylation and demethylation regulate gene expression during development. While DNA methyltransferases (DNMTs) establish and maintain cytosine methylation patterns, Ten-eleven translocation (Tet) dioxygenases catalyze sequential oxidation of 5-methylcytosine (5mC) to promote demethylation. Target-specific 5mC oxidation requires precise regulation of the Tet enzymatic activity. However, the mechanism underlying their activity control remains largely unexplored. Here we show a large low-complexity domain (LCD), present within the catalytic domain of Tet3, functions to repress the dioxygenase activity. Recombinant LCD-deleted Tet3 exhibits enhanced activity to convert 5mC into oxidized species. Deletion of the Tet3 LCD in mouse oocytes renders 5mC oxidation indiscriminately across the genome, leading to most prominently the derepression of ERVK retrotransposons and upregulation of adjacent genes. The extensive 5mC oxidation is associated with impairments in oocyte development. These findings suggest an intrinsic auto-regulatory mechanism of Tet3 dioxygenase operating to ensure a tight regulation of its enzymatic activity to achieve spatiotemporal specificity of methylome reprogramming during oocyte development.
2023-08-24 | GSE222498 | GEO
Project description:Dynamic DNA methylation and demethylation regulate gene expression during development. While DNA methyltransferases (DNMTs) establish and maintain cytosine methylation patterns, Ten-eleven translocation (Tet) dioxygenases catalyze sequential oxidation of 5-methylcytosine (5mC) to promote demethylation. Target-specific 5mC oxidation requires precise regulation of the Tet enzymatic activity. However, the mechanism underlying their activity control remains largely unexplored. Here we show a large low-complexity domain (LCD), present within the catalytic domain of Tet3, functions to repress the dioxygenase activity. Recombinant LCD-deleted Tet3 exhibits enhanced activity to convert 5mC into oxidized species. Deletion of the Tet3 LCD in mouse oocytes renders 5mC oxidation indiscriminately across the genome, leading to most prominently the derepression of ERVK retrotransposons and upregulation of adjacent genes. The extensive 5mC oxidation is associated with impairments in oocyte development. These findings suggest an intrinsic auto-regulatory mechanism of Tet3 dioxygenase operating to ensure a tight regulation of its enzymatic activity to achieve spatiotemporal specificity of methylome reprogramming during oocyte development.
2023-08-24 | GSE222492 | GEO
Project description:The epigenomes of mammalian sperm and oocytes, characterized by gamete-specific 5-methylcytosine (5mC) patterns, are reprogrammed in early embryogenesis to establish full developmental potential. It is broadly accepted that the paternal genome is actively demethylated in the zygote while the maternal genome undergoes passive demethylation thanks to DNA replication over the subsequent cleavage divisions. Here we reveal that both maternal and paternal genomes undergo widespread active and passive demethylation in the pronuclear zygote before the first mitotic division. Whereas the passive demethylation requires DNA replication, the active demethylation relies on enzymatic oxidation of 5mC, as deletion of the DNA dioxygenase, Tet3, but not the inhibition of replication, blocks the active demethylation. At actively demethylated loci, 5mCs appear to be processed to unmodified cytosines in a manner independent of the DNA glycosylase TDG. These observations suggest the occurrence of genuine active demethylation in both parental genomes following fertilization.
2016-09-01 | GSE60777 | GEO
Project description:The methylcytosine dioxygenase Tet3 is highly expressed as a specific isoform in oocytes and zygotes but essentially absent from later stages of mouse preimplantation development. Here, we show that Tet3 expression promotes transdifferentiation of embryonic stem cells to trophoblast-like stem cells. By genome-wide analyses we demonstrate that TET3 associates with and co-occupies chromatin with RNA Polymerase II. Tet3 expression induces a global increase of transcription and total RNA levels, and its presence further enhances chromatin accessibility in regions open for transcription. This novel function of TET3 is not specific to the oocyte isoform, independent of its catalytic activity, the CXXC domain, or its interaction with OGT, and is localised in its highly conserved exon 4. We propose a more general role for TET3 promoting open chromatin and enhancing global transcription during changes of cellular identity, separate from its catalytic function.
2018-05-31 | GSE94688 | GEO
Project description:Gametes are highly specialised cells that can give rise to the next generation through their ability to generate a totipotent zygote. In mouse, germ cells are first specified in the developing embryo as primordial germ cells (PGCs) starting around embryonic day (E) 6.25. Following subsequent migration into the developing gonad, PGCs undergo a wave of extensive epigenetic reprogramming at E10.5/E11.5, including genome-wide loss of 5-methylcytosine (5mC). The underlying molecular mechanisms of this process have remained enigmatic leading to our inability to recapitulate this step of germline development in vitro. Using an integrative approach, we show that this complex reprogramming process involves the coordinated interplay between promoter sequence characteristics, DNA (de)methylation, Polycomb (PRC1) complex and both DNA demethylation-dependent and -independent functions of Tet1 to enable the activation of a critical set of germline reprogramming responsive (GRR) genes involved in gamete generation and meiosis. Our results also unexpectedly reveal a role for Tet1 in safeguarding but not driving DNA demethylation in gonadal PGCs. Collectively, our work uncovers a fundamental biological role for gonadal germline reprogramming and identifies the epigenetic principles of the PGC-to-gonocyte transition that will be instructive towards recapitulating complete gametogenesis in vitro.
2018-03-07 | GSE76957 | GEO