Cyclic DNA remethylation following active demethylation at euchromatic regions in mouse embryonic stem cells.

Chromosome Research : an International Journal on the Molecular, Supramolecular and Evolutionary Aspects of Chromosome Biology
Musashi Kubiura-IchimaruMasako Tada

Abstract

DNA methylation is an essential epigenetic mark that regulates normal mammalian embryonic development. DNA methylation profiles are not always static, especially during germline development. In zygotes, DNA is typically highly methylated but, during preimplantation, DNA methylation is erased globally. Then, at the start of post-implantation development in mouse embryos, DNA again becomes dramatically hypermethylated. Chromatin structure regulates the accessibility of DNA-modifying enzymes to target DNA. Beyond that, however, our understanding of the pathway by which chromatin regulation initiates changes in global DNA methylation during mouse embryonic development remains incomplete. To analyse the relationship between global regulation of DNA methylation and chromatin status, we examined 5-methylcytosine (5mC), modified by the DNA methyltransferase DNMT, and the oxidative derivative 5-hydroxymethylation (5hmC), converted from 5mC by TET-family enzymes, by means of immunofluorescence staining of mitotic chromosomes in mouse embryonic stem cells (ESCs). Our comparison of immunostaining patterns for those epigenetic modifications in wild-type, DNMT-deficient, and TET-deficient ESCs allowed us to visualise cell cycle-mediated DNA ...Continue Reading

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