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Targeted DNA Methylation in Mouse Early Embryos.

Taiga Yamazaki1, Yu Hatano2, Noritada Kobayashi3

  • 1Division of Biomedical Research, Kitasato University Medical Center, Kitasato University, Kitamoto, Saitama, Japan. tyamazak@insti.kitasato-u.ac.jp.

Methods in Molecular Biology (Clifton, N.J.)
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PubMed
Summary

Researchers developed a genome editing method to control DNA methylation in mouse embryos. This technique allows for the study of pericentromeric hypomethylation

Keywords:
CpG methyltransferaseDNA methylationEpigenome editingLive-cell imagingPericentromerePreimplantation embryosTALE

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Area of Science:

  • Epigenetics
  • Developmental Biology
  • Genomics

Background:

  • Centromeres and pericentromeres exhibit DNA hypomethylation in germ cells and early embryos compared to somatic cells.
  • Understanding the functional significance of this region-specific DNA hypomethylation requires effective epigenomic manipulation methods.

Purpose of the Study:

  • To develop and describe a method for introducing region-specific DNA methylation into pericentromeres of early mouse embryos.
  • To enable comparative analysis between normal hypomethylated and epigenetically modified hypermethylated embryos.

Main Methods:

  • Utilized genome editing with a TALE-SssI fusion protein to target and methylate pericentromeric regions.
  • TALE protein recognizes pericentromeres, while SssI acts as a CpG methyltransferase.
  • Developed a method for detecting DNA methylation in edited embryos.

Main Results:

  • Successfully introduced DNA methylation into pericentromeres, increasing the methylation state from approximately 20% to 60-75%.
  • Demonstrated the feasibility of epigenetically editing pericentromeric regions in early mouse embryos.
  • Established a system for comparative developmental analysis.

Conclusions:

  • The TALE-SssI fusion protein system provides an effective means for region-specific epigenomic manipulation in early embryos.
  • This method facilitates the study of the biological roles of pericentromeric DNA methylation patterns during development.