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イーストにおける二重鎖の断裂修復には,先行および後退鎖のDNAポリメラーゼの両方が必要である
1Rosenstiel Center and Department of Biology, Brandeis University, Waltham, Massachusetts 02454-9110, USA.
Cell
|February 20, 1999
まとめ
遺伝子変換によるDNA修復には,PCNAやRFCのようなプロセス性コファクターを含む複製因子が必要です. 遅れた鎖の合成は,二重鎖の断裂修復を完了するために驚くほど重要です.
科学分野:
- 分子生物学は分子生物学である.
- イースト遺伝学 イースト遺伝学
- DNAの複製と修復を目的としたものです.
背景:
- ダブル・ストランド・ブレイク (DSB) は,ゲノム不安定を引き起こす可能性のある重度のDNA損傷です.
- 遺伝子変換は,DSBの修復のための重要なメカニズムであり,特にSaccharomyces cerevisiaeのペアタイプスイッチングのようなプログラムされたプロセスでは重要です.
- 複製因子はDNA修復に関与することが知られているが,DSB誘発の遺伝子変換におけるそれらの正確な役割は複雑である.
研究 の 目的:
- 酵母におけるMATロカスにおけるDSB誘発遺伝子変換における本質的な複製因子の役割を調査する.
- 複製機構がミトスのDSBの修復に参加する分子メカニズムを解明する.
主な方法:
- 主要な複製因子に欠陥があるSaccharomyces cerevisiaeの熱感性突然変異株を使用した.
- 誘発されたDSBsの後の遺伝子変換イベントの分子分析を行った.
- 過程性共因子,DNAポリメラーゼ,および遅滞性鎖複製機構における突然変異の影響を評価した.
主要な成果:
- 漸進性共因子 (PCNAとRFC) は,短期間であっても,DNA合成のストランド後侵入に不可欠です.
- DNAポリメラーゼデルタとエプシロンは,遺伝子変換に重要であり,Polエプシロンはより重要な役割を果たしています.
- 遅滞鎖合成 (DNAポリメラーゼα,DNAプリマゼ,Rad27p) に影響する変異体は,循環しない細胞でも,DSB修復の完了を著しく阻害する.
結論:
- DSB誘発の遺伝子変換は,ドナーテンプレートから先行性および後退性鎖の合成の両方を利用した改変された複製フォークを含む.
- 遅延ストランド複製機械は,DSBの修理を完了する上で,これまで過小評価されていた重要な役割を果たしています.
- 複製の終結は,新合成DNAを統合するDSBの第2端のキャプチャを通して起こります.
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