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Updated: May 7, 2026

07:11
Laser Micro-Irradiation to Study DNA Recruitment During S Phase
Published on: April 16, 2021
DNAポリメラーゼエプシロンは,DNA複製機構をS相チェックポイントとリンクします
T A Navas1, Z Zhou, S J Elledge
1Verna and Marrs McLean Department of Biochemistry, Baylor College of Medicine, Houston, Texas 77030.
Cell
|January 13, 1995
まとめ
DNAポリメラーゼエプシロン (pol epsilon) は,DUN2として識別され,S相チェックポイントとDNA損傷応答に不可欠です. この研究は,ポル・エプシロン (pol epsilon) を明らかにしています.
科学分野:
- 分子生物学は分子生物学である.
- 細胞サイクル規則 細胞サイクル規則
- DNAの複製と修復を図っています.
背景:
- DNA合成の阻害は,DNA損傷誘導性遺伝子を誘発し,S相チェックポイント経由で細胞分裂を停止します.
- dun2変異体は,損傷に対する転写応答とS相チェックポイント制御の両方で欠陥を示しています.
研究 の 目的:
- DNA損傷と複製ストレス反応におけるDUN2遺伝子の役割を調査する.
- 複製ブロックに対する細胞反応の調整におけるDNAポリメラーゼエプシロン (pol epsilon) の機能を特徴づける.
主な方法:
- dun2変異体の分離と特徴づけ.
- 遺伝子解析は,アレル間補足と変異分析を含む.
- DNAポリメラーゼエプシロンドメインの機能研究.
主要な成果:
- DUN2は,DNAポリメラーゼエプシロン (pol epsilon) をコードするPOL2として識別されました.
- ポリエプシロン変異体は,他のチェックポイント変異体とは異なり,S相チェックポイントとDUN1キナーゼ活性化において特異的に欠陥がある.
- ポリエプシロンは,分離可能なN端ポリメラーゼとC端チェックポイントドメインを有する.
結論:
- DNAポリメラーゼエプシロンは,DNA複製の重要なセンサーとして機能します.
- ポリエプシロンは,複製のストレス中に転写応答と細胞サイクル進行の両方を調整します.
- ポリエプシロンのC端域は,チェックポイント機能にとってユニークで不可欠です.
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DNA replication is initiated at sites containing predefined DNA sequences known as origins of replication. DNA is unwound at these sites by the minichromosome maintenance (MCM) helicase and other factors such as Cdc45 and the associated GINS complex.The unwound single strands are protected by replication protein A (RPA) until DNA polymerase starts synthesizing DNA at the 5’ end of the strand in the same direction as the replication fork. To prevent the replication fork from falling apart, a...
Replication in Eukaryotes
In eukaryotic cells, DNA replication is highly conserved and tightly regulated. Multiple linear chromosomes must be duplicated with high fidelity before cell division, so there are many proteins that fulfill specialized roles in the replication process. Replication occurs in three phases: initiation, elongation, and termination, and ends with two complete sets of chromosomes in the nucleus.
Many Proteins Orchestrate Replication at the Origin
Eukaryotic replication follows many of the same...
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