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Mutations01:39

Mutations

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Overview
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Epigenetic Regulation01:46

Epigenetic Regulation

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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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Covalently Linked Protein Regulators02:04

Covalently Linked Protein Regulators

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Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
These groups modify specific amino acids in a protein....
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Histone Modification02:32

Histone Modification

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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.
Acetylation
The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone...
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Mutations01:35

Mutations

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Mutations are changes in the sequence of DNA. These changes can occur spontaneously or they can be induced by exposure to environmental factors. Mutations can be characterized in a number of different ways: whether and how they alter the amino acid sequence of the protein, whether they occur over a small or large area of DNA, and whether they occur in somatic cells or germline cells.
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...
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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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Immunostaining for DNA Modifications: Computational Analysis of Confocal Images
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ヒストンのメチル化: 動的か静的か?

Andrew J Bannister1, Robert Schneider, Tony Kouzarides

  • 1Wellcome Trust/Cancer Research UK Institute, Department of Pathology, University of Cambridge, Tennis Court Road, cambridge CB2 1QR, United Kingdom.

Cell
|July 12, 2002
PubMed
まとめ
この要約は機械生成です。

遺伝子調節に不可欠なヒストンのメチル化は,積極的に除去することができます. このダイナミックなプロセスは,細胞内の遺伝子発現を制御するために不可欠です.

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科学分野:

  • 分子生物学は分子生物学である.
  • エピジェネティクス エピジェネティクス
  • 遺伝子規制 遺伝子規制

背景:

  • ヒストンのメチル化は,ヘテロクロマチンにおける転写サイレンシングにおいて重要な役割を果たします.
  • また,ユークロマティック領域の制御された転写に影響を与えます.
  • 遺伝子発現におけるヒストンのメチル化のダイナミックな性質は完全に理解されていません.

研究 の 目的:

  • ヒストンのメチル化が永久的なマークであるか,または積極的に除去できるかどうかを調査する.
  • 調節された遺伝子発現における活性脱メチル化の役割を決定する.

主な方法:

  • バイオケミカルアッセイを用いてヒストン変異の動態を研究する.
  • ヒストンの脱メチル化に関与する酵素を特定するために,遺伝的アプローチを用いる.
  • 変異したヒストンのメチル化への反応として,遺伝子発現パターンの変化を分析する.

主要な成果:

  • ヒストンのメチル化が永続的なマークではないことを示す証拠があります.
  • ヒストンからメチル群の活性除去が確認されています.
  • この脱メチル化プロセスは,遺伝子転写の調節と関連しています.

結論:

  • ヒストンのメチル化は,可逆的な変化である.
  • 活性ヒストンの脱メチル化は,ダイナミックな遺伝子調節のための重要なメカニズムです.
  • このプロセスを理解することは,細胞の機能と病気を理解するために不可欠です.