核の位置と局所のアセチル-CoAの生成はクロマチンの状態を調節する.
PubMedで要約を見る
まとめ
この要約は機械生成です。ドロソフィラの翼盤におけるヒストンのアセチル化パターンは,核の位置と脂肪酸代謝に関連しています. この表面関連アセチレーションは,発達中の組織における遺伝子発現に影響を与えます.
科学分野
- 発達生物学
- エピジェネティクス
- 分子生物学
背景
- ヒストンのアセチル化は,遺伝子発現,細胞機能,細胞運命を調節する重要なエピジェネティックメカニズムです.
- 発達中の組織におけるヒストンアセチル化の空間的パターンを理解することは,発達過程の解読に極めて重要です.
研究 の 目的
- ドロソフィラの翼盤上皮質におけるヒストンアセチル化の空間的分布と規制メカニズムを調査する.
- 特定のヒストンのアセチル化パターンに関連する代謝経路と細胞特性を特定する.
主な方法
- ヒストンのアセチル化マーク (H3K18ac,H4K8ac,総リシンアセチル化) の分析
- 表面層内の核の位置を追跡する
- アセチル-コア合成と脂肪酸β酸化を測定する.
- 脂肪酸のβ酸化を抑制し,ヒストンのアセチル化と遺伝子発現への影響を評価する.
主要な成果
- H3K18ac,H4K8ac,および全リンアセチル化がドロソフィラの翼円盤の外縁で増加した.
- ヒストンのアセチル化レベル,特にH3K18acは,表面に関連した核の位置と相関し,より高い.
- 表面核はアセチル-CoA合成酵素の活性が高く,ヒストンのアセチル化のためにアセチル-CoAを供給する役割を示唆した.
- 脂肪酸のβ酸化がリム内のヒストンアセチル化の主な炭素源として特定され,その抑制は発達遺伝子の近くでH3K18acのレベルを低下させた.
結論
- ドロソフィラの翼円盤の外縁には,核の位置と代謝活動によって特徴的なヒストンアセチル化パターンが示されている.
- 核の位置と代謝経路,特に脂肪酸β酸化は,発達中のヒストンのアセチル化およびその後の遺伝子発現を調節する上で重要な役割を果たします.
- この研究は,生殖過程で遺伝子の発現に影響を与える 皮質組織の物理的および代謝的シグネチャーを示しています.
関連する概念動画
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...
Chromatin is the massive complex of DNA and proteins packaged inside the nucleus. The complexity of chromatin folding and how it is packaged inside the nucleus greatly influences access to genetic information. Generally, the nucleus' periphery is considered transcriptionally repressive, while the cell's interior is considered a transcriptionally active area.
Topologically Associated Domains (TADs)
The 3-dimensional positioning of chromatin in the nucleus influences the...
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...
In eukaryotic cells, nascent mRNA transcripts need to undergo many post-transcriptional modifications to reach the cell cytoplasm and translate into functional proteins. For a long time, transcription and pre-mRNA processing were considered two independent events that occur sequentially in the cell. However, it has now been well established that transcription and pre-mRNA processing are two simultaneous processes that are precisely regulated inside the cell.
The chromatin structure, especially...
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...
Chromatin modification alters gene expression; therefore, scientists can add histone-modifying enzymes, histone variants, and chromatin remodeling complexes to somatic cells to aid reprogramming into pluripotent stem (iPS) cells.
Compact chromatin makes reprogramming difficult. Enzymes, such as histone demethylases and acetyltransferases, are often added during reprogramming to loosen the chromatin, making the DNA more accessible to transcription factors. Molecules that inhibit histone...

