ドロソフィラのゲノムにおける核細胞組織
Travis N Mavrich1, Cizhong Jiang, Ilya P Ioshikhes
1Center for Gene Regulation, Department of Biochemistry and Molecular Biology, The Pennsylvania State University, University Park, Pennsylvania 16802, USA.
Nature
|April 15, 2008
まとめ
比較ゲノミクスは,ドロソフィラと酵母菌の間の核細胞位置づけ戦略を明らかにしています. ドロソフィラは独特のクロマチンの組織を利用し,転写の開始とRNAポリメラーゼIIの核細胞への関与に影響を与えます.
科学分野:
- ゲノミクスゲノミクスとは
- 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
背景:
- 核子の位置づけは,遺伝子調節において極めて重要です.
- 比較ゲノミクスは,染色体組織の進化的メカニズムについての洞察を提供します.
- ヒストン変種H2A.Zはクロマチンの構造と機能に役割を果たします.
研究 の 目的:
- 高解像度のH2A.ZとDrosophila melanogaster.における大量核細胞体の位置の地図を作成する.
- ドロソフィラの染色体組織をサッカロマイセス・セレヴィシアの染色体組織と比較する.
- 染色体組織と転写機構の共進化を調査する.
主な方法:
- 比較ゲノミクス分析. 比較ゲノミクス分析.
- ヌクレオソーム位置の高解像度マッピング (H2A.Zとバルク).
- 遺伝子転写の開始部位に関する全ゲノム分析.
主要な成果:
- ドロソフィラと酵母の両方,転写開始部位の周りの正規のヌクレオソームフリー領域を示しています.
- ドロソフィラは,酵母とは異なり,H2A.Zを−1核胞体に組み込まない.
- ドロソフィラのトランスクリプション開始部位は,+1核分裂体内に埋もれていません.
- RNAポリメラーゼIIは,かなりの数のドロソフィラ菌の遺伝子の1+1核体で活性化し,一時停止する.
結論:
- 染色体の組織と転写の開始メカニズムは,主要な真核系の系統の間の根本的な違いを示しています.
- H2A.Zがニュクレオソームの位置づけと転写機構との相互作用において果たす役割は,種によって異なる.
- これらの違いを理解することは,真核生物における遺伝子調節の多様な戦略を解読する鍵となる.
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