関連する実験動画
Updated: Jun 19, 2026

07:55
Visualization of DNA Repair Proteins Interaction by Immunofluorescence
Published on: June 26, 2020
DNA末端切除,同質再結合およびDNA損傷チェックポイントの活性化には,CDK1が必要です
Grzegorz Ira1, Achille Pellicioli, Alitukiriza Balijja
1Rosenstiel Center and Department of Biology, Brandeis University, Waltham, Massachusetts 02454-9110, USA.
Nature
|October 22, 2004
まとめ
サイクリン依存キナーゼ1 (CDK1) は,酵母における二重鎖断裂 (DSB) の後のDNA損傷チェックポイントと同類復合修復の活性化に不可欠です. CDK1はまた,修復プロセスの重要なステップであるDNA末端解切を促進します.
科学分野:
- 分子生物学は分子生物学である.
- 細胞サイクル規制について
- DNA修復 DNA修復する
背景:
- DNAの二重鎖断裂 (DSB) は,DNA損傷のチェックポイントと修復経路の両方を活性化します.
- Mec1依存のDNAダメージチェックポイントとホモログ性再結合 (HR) は,ゲノム安定性の維持に不可欠です.
- これらの反応を調整する細胞周期調節体の役割は完全に理解されていません.
研究 の 目的:
- 発芽酵母におけるDSBに対するDNA損傷反応におけるサイクリン依存キナーゼ1 (CDK1) の役割を調査する.
- CDK1のチェックポイント活性化,同類再結合,DNA末端解剖への関与を決定する.
主な方法:
- 芽生えた酵母でHOエンドヌクレアスを用いて単一のDSBを誘導する.
- アナログ感受性CDK1タンパク質を用いて,CDK1の活性を抑制する.
- DNAダメージチェックポイントの活性化,同類再結合,および非同類末端結合 (NHEJ) の評価.
- RPAやRad51のようなDNA修復タンパク質の募集と,DSBにおけるMre11の蓄積を分析する.
主要な成果:
- DSBによるDNAダメージチェックポイントの活性化には,CDK1の活性化が必要です.
- CDK1は,すべての細胞サイクル段階における同類再結合 (HR) に不可欠である.
- CDK1に依存するHRの抑制は,非同類末端結合 (NHEJ) の増加につながります.
- CDK1は,RPAとRad51.1.の効率的な5'から3'端切除とリクルートに必須です.
- CDK1の活動は,持続的な末端切除を通じてDSB誘発のチェックポイントを維持するために必要である.
- CDK1はHRの後期段階,ストランド後侵襲において役割を果たします.
結論:
- CDK1は,DNA損傷のチェックポイントの活性化と,DSBの後の同型再結合修復を調整する重要な調節体です.
- 末端解剖におけるCDK1の機能は,チェックポイントシグナル伝達とHRの両方にとって重要である.
- CDK1の活動は,芽生える酵母における効率的で正確なDSB修復に不可欠です.
関連する概念動画
DNA Damage can Stall the Cell Cycle
In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
Inhibition of Cdk Activity
The orderly progression of the cell cycle depends on the activation of Cdk protein by binding to its cyclin partner. However, the cell cycle must be restricted when undergoing abnormal changes. Most cancers correlate to the deregulated cell cycle, and since Cdks are a central component of the cell cycle, Cdk inhibitors are extensively studied to develop anticancer agents. For instance, cyclin D associates with several Cdks, such as Cdk 4/6, to form an active complex. The cyclin D-Cdk4/6 complex...
S-Cdk Initiates DNA Replication
The cell cycle is a series of events leading to DNA duplication followed by the division of cell content to form two daughter cells. The cell cycle progresses in four stages—the cell increases in size (gap 1 or G1-phase), duplicates its DNA (synthesis or S-phase), prepares to divide (gap 2 or G2-phase), and divides (mitosis or M-phase).
Two states at the origin of replication
In eukaryotes, the initiation of replication occurs at many sites on the chromosomes, called the origins of replication.
Two states at the origin of replication
In eukaryotes, the initiation of replication occurs at many sites on the chromosomes, called the origins of replication.
DNA Damage Can Stall the Cell Cycle
In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
Inhibition of CDK Activity
The orderly progression of the cell cycle depends on the activation of Cdk protein by binding to its cyclin partner. However, the cell cycle must be restricted when undergoing abnormal changes. Most cancers correlate to the deregulated cell cycle, and since Cdks are a central component of the cell cycle, Cdk inhibitors are extensively studied to develop anticancer agents. For instance, cyclin D associates with several Cdks, such as Cdk 4/6, to form an active complex. The cyclin D-Cdk4/6 complex...
S-Cdk Initiates DNA Replication
The cell cycle is a series of events leading to DNA duplication followed by the division of cell content to form two daughter cells. The cell cycle progresses in four stages—the cell increases in size (gap 1 or G1-phase), duplicates its DNA (synthesis or S-phase), prepares to divide (gap 2 or G2-phase), and divides (mitosis or M-phase).
Two states at the origin of replication
In eukaryotes, the initiation of replication occurs at many sites on the chromosomes, called the origins of replication.
Two states at the origin of replication
In eukaryotes, the initiation of replication occurs at many sites on the chromosomes, called the origins of replication.

