複製されたDNAをニューロスペーラの特殊な細胞で再配置する
E U Selker1, E B Cambareri, B C Jensen
1Institute of Molecular Biology, University of Oregon, Eugene 97403.
Cell
|December 4, 1987
まとめ
Neurospora crassaへのDNAの導入は,その性サイクル中に配列の不安定性を引き起こします. プレミオティックに誘発された再編成 (RIP) という新しいプロセスは,ミオシス前の既存のDNA配列を再編成し,潜在的に進化を駆動します.
科学分野:
- 遺伝学 遺伝学とは
- 分子生物学は分子生物学である.
- 進化生物学の進化生物学について
背景:
- Neurospora crassaに外来DNAを導入すると,ゲノムの安定性が破壊されます.
- 配列の不安定性を理解することは,遺伝子操作と進化論の研究において極めて重要です.
研究 の 目的:
- DNA導入後のNeurospora crassaの配列不安定性のメカニズムを調査する.
- 性サイクル中のDNAの再編成のタイミングと性質を特定する.
主な方法:
- ニューロスポラ・クラッサの変異は,宿主,削除された,および外来配列を含むプラズミッドで.
- 遺伝子クロスとテトラド分析を用いた子孫における配列の再編成の分析.
- 配列の再編成によるDNAメチル化パターンの調査.
主要な成果:
- ホストのゲノムに既に存在している配列は,変換と交差の後,高度に再編成されました.
- 再編成は,複製のプラズミド派生要素と宿主派生要素の両方で発生しました.
- 独特の配列は変化せず,並べ替えられた配列は新型のサイトシンメチル化を示した.
- テトラド分析は,再編成が受精とカリオガミの間のプレミオティックに起こることを示しました.
結論:
- 新しい遺伝的プロセスであるプレミオティックに誘発された再配置 (RIP) は,Neurospora crassa.で特定されました.
- RIPは遺伝的多様性に貢献し,ゲノム組織を維持する役割を果たす可能性があります.
- このプロセスは,DNA導入に反応するゲノム進化のユニークなメカニズムを強調しています.
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