関連する実験動画
Updated: Jun 22, 2026

07:55
Visualization of DNA Repair Proteins Interaction by Immunofluorescence
Published on: June 26, 2020
DNA複製とダメージチェックポイント経路は,Crt1抑制体の抑制によって転写を誘導する
1Howard Hughes Medical Institute, Verna & Marrs McLean Department of Biochemistry, Baylor College of Medicine, Houston, Texas 77030, USA.
Cell
|September 19, 1998
まとめ
イーストのCRT1遺伝子はDNA損傷反応の調節体として作用し,複製ストレス中に細胞死亡を防ぐ. DNAを結合することによって遺伝子発現を制御し,DNA損傷によって抑制され,保存された負のフィードバックループを形成します.
科学分野:
- 分子生物学は分子生物学である.
- 遺伝学 遺伝学とは
- 細胞生物学 細胞生物学
背景:
- DNAダメージと複製のチェックポイント経路は,ゲノムの安定性を維持するために不可欠です.
- これらの経路の調節メカニズムを理解することは,ストレスに対する細胞の反応を理解するために不可欠です.
研究 の 目的:
- イーストのDNA損傷と複製チェックポイント経路における重要な効果因子を特定する.
- 損傷誘導性遺伝子と細胞活性を調節するCRT1遺伝子の機能を明らかにする.
主な方法:
- 酵母CRT1遺伝子の遺伝子識別と特徴付け.
- タンパク質の相互作用の分析,DNA結合および抑制剤Ssn6とTup1.1の徴用を含む.
- DNA損傷と複製ストレスに対する遺伝子発現の変化の評価.
- mec1 と rad53 の無変異を含む様々なストレス条件下での細胞活性の評価.
主要な成果:
- CRT1は,Ssn6とTup1を勧誘することによって,損傷誘導性遺伝子の抑制剤として作用するDNA結合タンパク質をコードします.
- CRT1レギュロン抑制は,複製性ストレス中の細胞生存に不可欠であり,mec1およびrad53変異体の致死性を抑制する.
- CRT1はDNA損傷時にハイパーフォスフォリレーションを受け,DNAからの解離と転写誘導につながります.
- CRT1は自己調節され,DNA損傷によって誘発され,ネガティブなフィードバックループを確立します.
結論:
- CRT1は,DNA損傷と複製チェックポイント経路における重要な効果因子であり,ストレス下での細胞生存に不可欠です.
- CRT1を含む自己調節的ネガティブなフィードバックメカニズムは,ストレスを排除した後,損傷誘発遺伝子の適時抑制を促進します.
- DNA損傷への反応として自己調節抑制体を抑制する確認されたメカニズムは,プロカリオットとユーカリオットにおいて進化的に保存されています.
関連する概念動画
Negative Regulator Molecules
Positive regulators allow a cell to advance through cell cycle checkpoints. Negative regulators have an equally important role as they terminate a cell’s progression through the cell cycle—or pause it—until the cell meets specific criteria.
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...
Restarting Stalled Replication Forks
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...
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...
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.

