バイナリースイッチと改変カセットは,ヒストン生物学やそれ以上の分野で用いられています
Wolfgang Fischle1, Yanming Wang, C David Allis
1Laboratory of Chromatin Biology, The Rockefeller University, New York, New York 10021, USA.
Nature
|October 3, 2003
まとめ
遺伝子調節に不可欠なヒストンの改変は複雑である. "バイナリスイッチ"や"改変カセット"のような新しい概念は,細胞がこれらの多様なヒストンマークをどのように読み取るか説明し,安定した改変ダイナミクスのモデルを提供しています.
科学分野:
- エピジェネティクス エピジェネティクス
- 分子生物学は分子生物学である.
- プロテオミクス プロテオミクスは,プロテオミクスの
背景:
- ヒストンタンパク質は,多くの翻訳後の修正を受け,生物学的プロセスに影響を与えます.
- これらの改変の複雑さと密度を理解することは,依然として課題です.
研究 の 目的:
- ヒストンの改変パターンを理解するための新しい概念的枠組みを導入する.
- ヒストン改変の生物学的読み取りのためのメカニズムを提案する.
主な方法:
- ヒストン変異のダイナミクスの仮説的モデリング.
- 文献レビューと既存のデータの合成.
主要な成果:
- 概念としての"バイナリスイッチ"と"修正カセット"の導入.
- 安定ヒストンの改変のダイナミック・リーダウットを説明するモデルの開発.
結論:
- これらの概念は,複雑なヒストンの改変パターンを解釈するための枠組みを提供します.
- 提案されたモデルは,ヒストン生物学における長年の疑問に対処し,他のタンパク質に適用することができる.
関連する概念動画
X-Inactivation
The human X chromosome contains over ten times the number of genes as in the Y chromosome. Since males have only one X chromosome, and females have two, one might expect females to produce twice as many of the proteins, with undesirable results.
Position-effect Variegation
In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
Histone Modification
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 deacetylase,...
Acetylation
The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone deacetylase,...
Spreading of Chromatin Modifications
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.
Writers
The writer is an enzyme that can...
Writers
The writer is an enzyme that can...
Caspases
Caspase, a family of cysteine proteases, serve as effectors in apoptosis. The ced3 gene in C.elegans was first identified to be involved in apoptosis. This gene encodes the ced-3 caspase that is similar to the interleukin-1-beta converting enzyme or ICE in mammals. In addition to apoptosis, caspases also function in the inflammatory response. Inflammatory caspases are essential in activating pro-inflammatory cytokines that recruit immune cells and block the replication of pathogens inside cells.
Histone Modification
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 deacetylase,...
Acetylation
The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone deacetylase,...


