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Mutations and epimutations in mammalian cells.

R Holliday1

  • 1CSIRO Division of Biomolecular Engineering, Laboratory for Molecular Biology, North Ryde, NSW, Australia.

Mutation Research
|September 1, 1991
PubMed
Summary
This summary is machine-generated.

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Heritable DNA methylation changes, or epimutations, silence genes in mammalian cells. These epimutations, alongside mutations, are crucial for cellular transformation and tumor development.

Area of Science:

  • Cell Biology
  • Genetics
  • Epigenetics

Background:

  • Early studies suggested heritable variation in mammalian cells involved mutations and epigenetic events.
  • Recent research highlights heritable DNA methylation as a key epigenetic mechanism.

Purpose of the Study:

  • To investigate the role of DNA methylation in gene silencing and heritable variation.
  • To explore the implications of epimutations in cellular transformation and tumor progression.

Main Methods:

  • Studied post-synthetic methylation of cytosine in gene regulatory regions.
  • Utilized the demethylating agent 5-azacytidine (5-aza-CR) to reactivate silent genes.
  • Investigated gene inactivation via de novo methylation in permanent cell lines.

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Main Results:

  • DNA methylation patterns are heritable and typically associated with gene silencing.
  • Silent genes can be reactivated by demethylating agents like 5-aza-CR.
  • Permanent cell lines inactivate genes through de novo methylation, unlike normal diploid cells.

Conclusions:

  • Epimutations, or heritable DNA methylation changes, contribute to functional hemizygosity and gene silencing.
  • Both mutations and epimutations are likely important in the development of transformed, tumorigenic cells.
  • Understanding epimutations has significant implications for cancer research and cellular transformation studies.