代替プロモーターの調節における内遺伝子DNAメチル化の保存された役割
関連する実験動画
Updated: Jun 11, 2026

09:42
Immunostaining for DNA Modifications: Computational Analysis of Confocal Images
Published on: September 7, 2017
Alika K Maunakea1, Raman P Nagarajan, Mikhail Bilenky
1Brain Tumor Research Center, Department of Neurosurgery, Helen Diller Family Comprehensive Cancer Center, University of California San Francisco, San Francisco, California 94158, USA.
Nature
|July 9, 2010
まとめ
プロモーターだけでなく,遺伝子体内のDNAメチル化は,組織特異的な遺伝子発現を調節する上で重要な役割を果たします. この研究では,ヒトの脳内のDNAメチル化をマッピングし,遺伝子の内の代替プロモーターを制御する機能を明らかにしました.
科学分野:
- エピジェネティクスとゲノミクス
- 分子生物学は分子生物学である.
- 神経科学は神経科学である.
背景:
- DNAメチル化は通常,5'プロモーターの遺伝子発現を抑制する.
- 遺伝子体内のDNAメチル化の機能 (イントラゲンメチル化) は,ほとんど不明のままである.
- 組織特異的なメチル化パターンは,哺乳類,特に遺伝子体内で観察されています.
研究 の 目的:
- 遺伝子発現の調節における内遺伝子DNAメチル化の役割を調査する.
- 人間の脳におけるDNAメチル化の高解像度マップを作成する.
- 内遺伝子メチル化が組織および細胞タイプ特異の転写に影響を与えるかどうかを判断する.
主な方法:
- 人間の脳 (24,700万のCpGサイト) の包括的なDNAメチレーションマップの生成.
- プロモーター,イントラジェニック,インタージェニック領域におけるCpG島 (CGI) メチル化状態の分析.
- 規制要素を特定するためにRNAとヒストンの改変データ (H3K4me3) と統合.
- 人間とマウスのモデルにおけるSHANK3ロカスに関するインビトロおよびインビボ研究.
主要な成果:
- メチル化CpG群島の大部分は5'プロモーターではなく,遺伝子体や遺伝子間領域内に位置しています.
- ヒトとマウスの組織の間には内遺伝的メチル化が保存され,転写開始部位と重複する.
- 組織特異の内遺伝子DNAメチル化は,代替プロモーターの活性を調節し,細胞文脈特異の転写につながります.
結論:
- 内遺伝子DNAメチレーションは,遺伝子発現を調節する重要な表遺伝的メカニズムです.
- それは,代替プロモーターを制御し,組織および細胞タイプに特異的なトランスクリプトを生成する上で重要な役割を果たします.
- この発見は,プロモーターメチル化を超えて,表遺伝的調節に関する私たちの理解を拡大します.
関連する概念動画
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...
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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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Chromatin Structure Regulates pre-mRNA Processing
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...
The chromatin structure, especially...
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The eukaryotic promoter region is a segment of DNA located upstream of a gene. It contains an RNA polymerase binding site, a transcription start site, and several cis-regulatory sequences. The proximal promoter region is located in the vicinity of the gene and has cis-regulatory sequences and the core promoter. The core promoter is the binding site for RNA polymerase and is usually located between -35 and +35 nucleotides from the transcription start site. The distal promoter regions are...
The Eukaryotic Promoter Region
The eukaryotic promoter region is a segment of DNA located upstream of a gene. It contains an RNA polymerase binding site, a transcription start site, and several cis-regulatory sequences. The proximal promoter region is located in the vicinity of the gene and has cis-regulatory sequences and the core promoter. The core promoter is the binding site for RNA polymerase and is usually located between -35 and +35 nucleotides from the transcription start site. The distal promoter regions are...

