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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.
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Epigenetic Regulation01:46

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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 in the nucleosomes are post-translationally modified (PTM) to increase or decrease access to DNA. The commonly observed PTMs are methylation, acetylation, phosphorylation, and ubiquitination of lysine amino acids in the histone H3 tail region. These histone modifications have specific meaning for the cell. Hence, they are called "histone code". The protein complex involved in histone modification is termed as "reader-writer" complex.
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Certain biochemical processes, such as embryonic development and cell growth regulation, depend on the repression of specific genes. DNA binding proteins known as eukaryotic transcription inhibitors regulate the repression of gene expression in eukaryotes. The presence of these inhibitors at the required location and time in the cell is triggered by the presence of hormones and additional signals from other cells.
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Nucleosome Remodeling02:54

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Nucleosomes are the basic units of chromatin compaction. Each nucleosome consists of the DNA bound tightly around a histone core, which makes the DNA inaccessible to DNA binding proteins such as DNA polymerase and RNA polymerase. Hence, the fundamental problem is to ensure access to DNA when appropriate, despite the compact and protective chromatin structure.
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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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Occupancy-based mechanism is the chief mode of ROS1 function in preventing DNA hypermethylation.

Li Deng1, Guangfeng Zhu1, Wenying Zhong1

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Summary
This summary is machine-generated.

The DNA demethylase ROS1 maintains genome stability by preventing DNA hypermethylation, not solely through its enzymatic activity. ROS1

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Area of Science:

  • Epigenetics
  • Molecular Biology
  • Plant Science

Background:

  • DNA methylation is crucial for genome stability.
  • The Arabidopsis demethylase ROS1 was thought to primarily use its glycosylase/lyase activity to prevent hypermethylation.
  • This activity poses risks to genomic fidelity.

Purpose of the Study:

  • To challenge the prevailing paradigm of ROS1 function.
  • To investigate ROS1's role in DNA demethylation and chromatin accessibility.
  • To elucidate the mechanisms underlying ROS1's regulation of DNA methylation balance.

Main Methods:

  • Investigating ROS1 occupancy-driven demethylation.
  • Assessing ROS1's role in preventing de novo DNA methylation.
  • Analyzing ROS1's function in chromatin accessibility regulation.

Main Results:

  • ROS1 drives passive demethylation via occupancy, independent of its glycosylase/lyase activity.
  • ROS1 primarily maintains hypomethylation by inhibiting de novo methylation.
  • ROS1 acts as a marker and regulator of chromatin accessibility in both DNA methylation-dependent and -independent contexts.

Conclusions:

  • ROS1's primary mechanism for demethylation is occupancy-based, minimizing genomic threats.
  • ROS1 plays a dual role in regulating DNA methylation and chromatin accessibility.
  • These findings redefine ROS1's functions and their interplay in epigenetic regulation.