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Related Experiment Videos

Epigenetic reprogramming in mammalian development.

W Reik1, W Dean, J Walter

  • 1Laboratory of Developmental Genetics and Imprinting, The Babraham Institute, Cambridge CB2 4AT, UK.

Science (New York, N.Y.)
|August 11, 2001
PubMed
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Mammalian DNA methylation patterns are reprogrammed during development, crucial for establishing cell potential and imprinting. This epigenetic reprogramming involves genome-wide demethylation and remethylation, impacting gene expression and cellular differentiation.

Area of Science:

  • Epigenetics
  • Genomics
  • Developmental Biology

Background:

  • DNA methylation is a key epigenetic modification regulating genome function.
  • Somatic cell methylation patterns are generally stable but undergo reprogramming in germ cells and early embryos.
  • This reprogramming is vital for processes like imprinting and establishing developmental potential.

Purpose of the Study:

  • To review current knowledge on DNA methylation reprogramming in mammals.
  • To explore the role of reprogramming in establishing nuclear totipotency and erasing epigenetic information.
  • To discuss the relationship between reprogramming, developmental potency, and imprinting.

Main Methods:

  • Review of existing literature on DNA methylation and epigenetic reprogramming.

Related Experiment Videos

  • Analysis of known mechanisms of DNA methylation maintenance (e.g., Dnmt1) and de novo methylation (e.g., Dnmt3a, Dnmt3b).
  • Discussion of observed genomewide methylation alterations during mammalian development.

    • Main Results:

    • Mammals exhibit distinct developmental periods of genome-wide DNA methylation reprogramming.
    • Reprogramming involves demethylation followed by cell- or tissue-specific remethylation.
    • These events are critical for imprinting and potentially for establishing totipotency.

    Conclusions:

    • DNA methylation reprogramming is a fundamental process in mammalian development.
    • Understanding reprogramming dynamics is key to understanding developmental potency and imprinting.
    • Further research is needed to elucidate the precise mechanisms and functions of demethylation enzymes.