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The inheritance of epigenetic defects.

R Holliday1

  • 1Genetics Division, National Institute for Medical Research, Mill Hill, London, United Kingdom.

Science (New York, N.Y.)
|October 9, 1987
PubMed
Summary

DNA methylation patterns control gene expression and are inherited. Loss of this epigenetic mark can cause heritable gene expression errors, potentially impacting cancer and aging, with some defects possibly passed to offspring.

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Area of Science:

  • Epigenetics
  • Molecular Biology
  • Genetics

Background:

  • Gene expression in higher organisms is regulated by DNA methylation.
  • Methylation patterns are heritable, influencing inherited traits.
  • Loss of methylation can lead to abnormal gene expression.

Purpose of the Study:

  • To explore the role of DNA methylation in gene expression control.
  • To investigate the consequences of methylation loss in oncogenesis and aging.
  • To propose mechanisms for the inheritance and repair of epigenetic defects.

Main Methods:

  • Review of existing evidence on DNA methylation and gene expression.
  • Analysis of methylation patterns in transformed cell lines.
  • Hypothesizing about epigenetic repair mechanisms during meiosis.

Main Results:

  • DNA methylation is crucial for inherited gene expression control.
  • Loss of methylation, potentially from DNA damage, causes heritable expression abnormalities.
  • Transformed cell lines often exhibit gene silencing via de novo methylation.

Conclusions:

  • Epigenetic defects from methylation loss may contribute to cancer and aging.
  • Recombination during meiosis may repair germline epigenetic defects.
  • Some epigenetic defects can be transmitted to offspring, highlighting intergenerational epigenetic inheritance.

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