関連する実験動画
Updated: May 10, 2026

09:42
Immunostaining for DNA Modifications: Computational Analysis of Confocal Images
Published on: September 7, 2017
ヒストンのSet2メチル化H3ライシン36は,転写された遺伝子のヒストン交換を抑制する
Swaminathan Venkatesh1, Michaela Smolle, Hua Li
1Stowers Institute for Medical Research, 1000 E. 50th Street, Kansas City, Missouri 64110, USA.
Nature
|August 24, 2012
まとめ
Set2によるヒストロンH3ライシン36メチル化 (H3K36me) は,遺伝子転写を制御する. Set2はヒストンのアセチル化を抑制し,脱アセチル化を促進することにより,暗号的転写を防止し,RNAポリメラーゼIIの精度を保証します.
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,特にH3K36meは,遺伝子発現の調節に不可欠な共同転写マークです.
- Rpd3Sヒストン脱エチラゼ複合体は,H3K36meによって活性化され,遺伝子コーディング領域をハイポアセチル化状態に維持します.
- Set2の喪失は,H3K36のアセチル化と,オープン・リーディングフレーム (ORF) の内部から暗号的転写の開始につながります.
研究 の 目的:
- 共同転写ヒストンアセチル化に起因する要因を解明する.
- 遺伝子コーディング領域内のアセチル化を調節するヒストン交換の役割を調査する.
- ヒストンアセチル化を抑制し,脱アセチル化をシグナル化するSet2の二重機能を理解する.
主な方法:
- イーストにおけるヒストン交換メカニズムを研究した.
- H3K36メチル化とヒストンチャペロンとの相互作用を分析した.
- ヒストンのアセチル化と脱アセチル化ダイナミクスに対するSet2の影響を研究した.
主要な成果:
- 同転写ヒストンのアセチル化は,酵母におけるORFに対するヒストンの交換によって部分的に媒介されます.
- Set2によるH3K36メチル化はヒストン-チャペロン相互作用とヒストン交換を抑制する.
- Set2の活動は,新たにアセチル化したヒストンが転写された遺伝子に組み込まれるのを防ぐ.
結論:
- Set2は,アセチル化ヒストンの組み込みを抑制し,転写された遺伝子上のヒストンの脱セチル化を促進する二重の役割を果たしています.
- この表遺伝子経路は,偽の暗号化トランスクリプションの開始を防ぐために不可欠です.
- RNAポリメラーゼIIによる転写精度の維持は,Set2媒介のH3K36メチル化経路に依存しています.
さらに関連する動画
関連する概念動画
Epigenetic Regulation
Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
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...
Heterochromatin
The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions that take up more dye are called heterochromatin. Heterochromatin is further classified into two forms – constitutive heterochromatin and facultative heterochromatin.
Constitutive heterochromatin: It is a highly compact region of chromatin that is mostly concentrated in the centromere and telomere. Unlike euchromatin, the amino acid at 9th...
Constitutive heterochromatin: It is a highly compact region of chromatin that is mostly concentrated in the centromere and telomere. Unlike euchromatin, the amino acid at 9th...
Epigenetic Regulation
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...
X-chromosome...
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,...

