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Hepatocyte regeneration is driven by embryo-like DNA methylation reprogramming.

Tal Falick Michaeli1,2, Ofra Sabag1, Batia Azria1

  • 1Department of Developmental Biology and Cancer Research, Institute for Medical Research Israel-Canada, Hebrew University Medical School, Jerusalem 91120, Israel.

Proceedings of the National Academy of Sciences of the United States of America
|April 8, 2024
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Liver regeneration involves programmed DNA methylation changes, mimicking embryonic states. These epigenetic shifts, particularly demethylation, are crucial for hepatocyte proliferation during liver repair.

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DNA methylationdedifferentiationpartial hepatectomy

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Area of Science:

  • Epigenetics
  • Molecular Biology
  • Regenerative Medicine

Background:

  • Partial hepatectomy triggers liver regeneration through hepatocyte proliferation.
  • DNA methylation dynamics play a critical role in cellular differentiation and development.

Purpose of the Study:

  • To investigate the dynamic changes in DNA methylation during liver regeneration.
  • To understand the role of epigenetic reprogramming in hepatocyte proliferation.

Main Methods:

  • Analysis of DNA methylation profiles during liver regeneration post-partial hepatectomy.
  • Utilizing Tet2/Tet3-deletion mouse models to assess the necessity of methylation changes.
  • Comparison of epigenetic states between regenerating adult hepatocytes and embryonic hepatoblasts.

Main Results:

  • Observed significant programmed DNA methylation alterations, including de novo methylation and demethylation, during liver regeneration.
  • Demonstrated that these transient epigenetic changes partially resemble the DNA methylation patterns of embryonic hepatoblasts (E16.5).
  • Showcased that Tet2/Tet3 deletion impairs liver regeneration by affecting essential embryonic gene functions, such as proliferation.

Conclusions:

  • Hepatocytes undergo epigenetic dedifferentiation during liver regeneration, partially reverting to an embryonic-like methylation state.
  • DNA demethylation is a critical, programmed step essential for initiating hepatocyte proliferation in liver regeneration.
  • The findings suggest a conserved epigenetic mechanism for developmental gene regulation applicable to regenerative processes.