Abstract
In germ cell lines, including early preimplantation embryos, centromeres and pericentromeres are known to show a marked hypomethylation pattern compared to somatic cells. Elucidation of the biological function of this region-specific DNA hypomethylation state, region-specific epigenomic manipulation is essential as an analytical method. We have applied genome editing to show that region-specific DNA methylation can be effectively introduced by a fusion protein, TALE, which recognizes pericentromeres, and SssI, a bacterial CpG methyltransferase. This makes it possible to increase the DNA methylation state of the pericentromeres, which is normally about 20%, to about 60–75%, enabling comparative analysis of the developmental processes of normal embryos with hypomethylated pericentromeres and embryos that have been epigenetically edited to be hypermethylated. In this chapter, we describe a method for introducing DNA methylation into pericentromeres of early mouse embryos by expressing TALE-SssI fusion protein and a method for detecting DNA methylation.
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Acknowledgments
This work was supported by JSPS KAKENHI Grant Numbers JP19K05956, JP22K05562 (TY) and JP18H02357, JP18H05528 (KY). This work was also supported by a Grant-in-Aid for Research from the Kitasato University Medical Center and Kawano Masanori Memorial Public Interest Incorporated Foundation for Promotion of Pediatrics (TY).
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Yamazaki, T., Hatano, Y., Kobayashi, N., Yamagata, K. (2023). Targeted DNA Methylation in Mouse Early Embryos. In: Hatada, I., Horii, T. (eds) Epigenomics. Methods in Molecular Biology, vol 2577. Humana, New York, NY. https://doi.org/10.1007/978-1-0716-2724-2_17
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DOI: https://doi.org/10.1007/978-1-0716-2724-2_17
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