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Related Concept Videos

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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.
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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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Epigenetics is the study of inherited changes in a cell's phenotype without changing the DNA sequences. It provides a form of memory for the differential gene expression pattern to maintain cell lineage, position-effect variegation, dosage compensation, and maintenance of chromatin structures such as telomeres and centromeres. For example, the structure and location of the centromere on chromosomes are epigenetically inherited. Its functionality is not dictated or ensured by the underlying...
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Function and information content of DNA methylation.

Dirk Schübeler1

  • 11] Friedrich Miescher Institute for Biomedical Research, Maulbeerstrasse 66, CH-4058 Basel, Switzerland. [2] University of Basel, Faculty of Science, Petersplatz 1, CH-4003 Basel, Switzerland.

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DNA methylation, a key regulator of gene activity, is influenced by DNA sequence and can serve as a disease biomarker. Its role in gene silencing and disease development requires further investigation.

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Area of Science:

  • Molecular Biology
  • Epigenetics
  • Genomics

Background:

  • Cytosine methylation is a crucial epigenetic modification typically linked to gene silencing.
  • Dysregulation of methylation factors is implicated in human diseases, but their precise roles in malignancy are unclear.
  • Recent genomic studies reveal dynamic methylation patterns at gene regulatory regions.

Purpose of the Study:

  • To investigate the relationship between DNA sequence and local methylation patterns.
  • To explore the potential of DNA methylation as a biomarker in normal and diseased cells.
  • To address remaining questions regarding methylation targeting, recognition, and its impact on genome function.

Main Methods:

  • Analysis of genomic maps of DNA methylation.
  • Investigating the role of TET proteins in active demethylation at transcription factor binding sites.

Main Results:

  • DNA sequence largely dictates local DNA methylation patterns.
  • Active demethylation by TET proteins occurs at specific regulatory regions.
  • DNA methylation patterns are dynamic and informative for gene regulation.

Conclusions:

  • DNA methylation patterns are primarily determined by the underlying DNA sequence, challenging the view of methylation as solely instructive for silencing.
  • DNA methylation holds potential as a biomarker for various cellular states and diseases.
  • Further research is needed to understand the mechanisms of methylation targeting and its functional consequences in genome readout.