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Epigenetic Regulation01:46

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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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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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TALEored Epigenetics: A DNA-Binding Scaffold for Programmable Epigenome Editing and Analysis.

Grzegorz Kubik1, Daniel Summerer2

  • 1Technische Universität Dortmund, Fakultät für Chemie und Chemische Biologie, Otto-Hahn-Strasse 4a, 44227, Dortmund, Germany.

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PubMed
Summary

Transcription-activator-like effectors (TALEs) offer novel ways to read and edit epigenetic cytosine modifications, including 5-methylcytosine (mC) and its oxidized derivatives. These DNA-binding domains are crucial for understanding gene regulation and developing new therapeutic strategies.

Keywords:
DNA modificationsDNA recognitionepigeneticsmethylcytosinetranscription-activator-like effectors

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Area of Science:

  • Epigenetics
  • Molecular Biology
  • Genomics

Background:

  • Cytosine modifications, including 5-methylcytosine (mC) and its oxidized forms (hmC, fC, caC), are key regulators of gene expression, genome stability, development, and disease.
  • The discovery of oxidized mC derivatives suggests they may function as independent epigenetic marks beyond their role in demethylation.
  • The growing complexity of DNA epigenetic information necessitates advanced tools for its detection and manipulation.

Purpose of the Study:

  • To review recent advancements in utilizing Transcription-activator-like effectors (TALEs) for reading and editing epigenetic cytosine modifications.
  • To highlight the potential of TALEs in deciphering the biological roles of various cytosine derivatives.
  • To showcase TALEs' capability in guiding enzymatic editing domains to specific genomic locations.

Main Methods:

  • Review of recent scientific literature on TALE applications in epigenetics.
  • Focus on TALE-based technologies for recognizing and manipulating DNA epigenetic marks.
  • Discussion of TALE's programmable DNA-binding specificity.

Main Results:

  • TALEs can be engineered for sequence-specific recognition of diverse epigenetic cytosine modifications.
  • TALEs enable direct reading of epigenetic information encoded in DNA.
  • TALEs can be fused with effector domains to facilitate targeted epigenetic editing.

Conclusions:

  • TALEs represent a powerful and versatile platform for interrogating and modifying the epigenome.
  • Advances in TALE technology are crucial for understanding the functional significance of cytosine modifications.
  • TALE-based approaches hold promise for future research in epigenetics and related diseases.