FoxA1はエピジェネティックシグネチャをエンハンサー駆動の系統特異の転写に翻訳する
Mathieu Lupien1, Jérôme Eeckhoute, Clifford A Meyer
1Division of Molecular and Cellular Oncology, Department of Medical Oncology, Dana-Farber Cancer Institute and Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, MA 02115, USA.
Cell
|March 25, 2008
まとめ
DNAに結合するFoxA1先駆的因子により,細胞特有の遺伝子プログラムが確立されます. 染色体への結合はヒストンのメチル化に依存し,増強剤の形成と細胞のアイデンティティを導く.
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
- ゲノミクスゲノミクスとは
背景:
- 複雑な生物は,発達と機能のために組織特異の遺伝子発現を必要とします.
- 転写因子FoxA1は,核細胞内のDNAに結合する能力を持つ,既知のパイオニア因子です.
- FoxA1が細胞特異的な機能を確立する方法を理解することは,発達生物学にとって極めて重要です.
研究 の 目的:
- FoxA1の細胞型特異的な機能の基礎となるメカニズムを調査する.
- FoxA1がクロマチンおよび遺伝子転写を調節する他の要因とどのように相互作用するかを決定する.
- 特定のゲノム部位にFoxA1の採用を誘導するエピジェネティックシグナルを特定する.
主な方法:
- ゲノム全体の位置分析を使用して,FoxA1の結合部位をマッピングしました.
- 染色体構造の変化は,FoxA1結合に関連して評価されました.
- ヒストン改変の役割,特にヒストンH3ライシン4ジメチル化が調査されました.
主要な成果:
- FoxA1の細胞特異的な役割は,主に近隣のプロモーターではなく,遠隔の強化剤へのリクルートによって引き起こされます.
- FoxA1の差異的募集は染色体構造を変化させ,系統特異の転写因子との協力を促進する.
- FoxA1の微分クロマチンの結合は,ヒストンH3ライシン4ジメチル化の存在に依存しています.
結論:
- ヒストンH3ライシン4二メチル化は,FoxA1の募集のための表遺伝子シグネチャーとして機能します.
- FoxA1は,この表遺伝子シグネチャーを利用してクロマチンの構造を変更し,系統特有の強化剤と転写プログラムを確立します.
- この研究は,細胞タイプ特異的な遺伝子発現パターンを生成するための重要なメカニズムを明らかにしています.
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.
Transcription Factors
Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...
Transcription Factors
Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...
Epigenetic Regulation
Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
General Transcription Factors
Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...
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...


