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Related Concept Videos

Epigenetic Regulation01:37

Epigenetic Regulation

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Epigenetic changes alter the physical structure of the DNA without changing the genetic sequence and often regulate whether genes are turned on or off. This regulation ensures that each cell produces only proteins necessary for its function. For example, proteins that promote bone growth are not produced in muscle cells. Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
X-chromosome...
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Phase II Reactions: Methylation Reactions01:17

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Methylation is a phase II biotransformation process involving the attachment of a methyl group to a substrate. Enzymes known as methyltransferases orchestrate this reaction.
The mechanism of methylation unfolds in two stages. The first stage sees a methyltransferase enzyme facilitating the transfer of a methyl group from S-adenosylmethionine (SAM) to the substrate, forming S-adenosylhomocysteine (SAH). The second stage involves further metabolism of SAH into homocysteine, which can be recycled...
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Histone Modification02:32

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The histone proteins have a flexible N-terminal tail extending out from the nucleosome. These histone tails are often subjected to post-translational modifications such as acetylation, methylation, phosphorylation, and ubiquitination. Particular combinations of these modifications form “histone codes” that influence the chromatin folding and tissue-specific gene expression.
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DNA methylation: old dog, new tricks?

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DNA methylation, an epigenetic process, can activate gene transcription, not just repress it. This occurs in specific cells like germ and pluripotent cells, challenging prior scientific assumptions.

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Area of Science:

  • Epigenetics
  • Molecular Biology
  • Genomics

Background:

  • DNA methylation is traditionally linked to gene silencing at CpG-island promoters.
  • Epigenetic modifications play crucial roles in gene regulation.

Purpose of the Study:

  • To investigate the diverse roles of DNA methylation beyond transcriptional repression.
  • To challenge the established view of DNA methylation solely as a repressive mark.

Main Methods:

  • Analysis of recent high-throughput genomic and proteomic screening data.
  • Examination of transcription factor interactions with methylated DNA.
  • Correlation of promoter methylation status with gene transcription levels in various cell types.

Main Results:

  • DNA methylation can be associated with transcriptional activation.
  • Transcription factors can interact with methylated DNA sequences.
  • Genes with methylated promoters are highly transcribed in specific cellular contexts, notably germ cells and pluripotent cells.

Conclusions:

  • DNA methylation is not exclusively associated with the repression of transcription initiation.
  • The functional outcome of DNA methylation is context-dependent.
  • New perspectives on DNA methylation's role in gene regulation are warranted, especially in germ and pluripotent cells.