RNAポリメラーゼIIは,DNA複製中の活性遺伝子と関連している
Tyler K Fenstermaker1, Svetlana Petruk1, Sina K Kovermann2
1Department of Biochemistry and Molecular Biology, Sidney Kimmel Medical College, Sidney Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, PA, USA.
Nature
|July 19, 2023
まとめ
RNAポリメラーゼII (Pol II) は,DNA複製の直後に活性遺伝子と迅速に再結合し,エピジェネティックマークを必要とせずに転写を再開します. これは,複製中にPol IIがDNAの近くに留まることを示唆しています.
科学分野:
- 分子生物学
- エピジェネティクス
- 遺伝子規制
背景:
- 転写機構はDNA複製中に分離すると考えられている.
- エピジェネティックマークは 転写記憶を維持し クロマチンを再構築すると考えられています
- RNAポリメラーゼII (Pol II) は,クロマチンの再構築後に採用されると考えられています.
研究 の 目的:
- ポル2が娘のDNAに 戻った経緯を調査する
- DNA複製から転写再開への移行を理解する.
主な方法:
- 複製後のフォークパスにおけるPol IIの行動に関する実験的調査.
- 新生DNA鎖とのPol II複合体の関連分析
主要な成果:
- Pol IIは,転写タンパク質と未成熟のRNAで,複製後すぐに,先行性および遅滞性の両方の活性遺伝子と再結合する.
- トランスクリプションは 新生DNAで急速に再開します
- Pol II-PCNAの相互作用は,DNAの近くに転写複合体を保持する可能性があります.
結論:
- 複製過程で,トランスクリプション的に活性なPol II複合体はDNAのすぐ近くに留まることがあります.
- エピジェネティックマークは 新たに合成されたDNAに Pol II を取り込むのに必要ないかもしれない
- 発見は,転写-複製のカップリングの確立されたモデルに挑戦しています.
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