関連する実験動画
Updated: May 12, 2026
08:14
Inhaled Medications: Bronchodilators and Corticosteroids
38.2K
ATMは,V(D) J再結合時にDNAの二重鎖断裂複合体を安定させる
Andrea L Bredemeyer1, Girdhar G Sharma, Ching-Yu Huang
1Department of Pathology and Immunology, Washington University School of Medicine, St Louis, Missouri 63110, USA.
Nature
|June 27, 2006
まとめ
アタキシア・テランジエクタジア変異 (ATM) タンパク質キナーゼは,DNA修復とDNA二重鎖断裂 (DSB) に対する細胞反応に不可欠です. ATM欠乏症はDNA修復を阻害し,がん,特にリンパ性悪性腫瘍のリスクを高めます.
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
- がん研究 がん研究
背景:
- アタクシア・テランジエクタシア変異 (ATM) タンパク質キナーゼは,DNA二重鎖断裂 (DSB) に対する細胞反応の重要な媒介体である.
- ATM欠乏症は,リンパ性欠乏症,ゲノム不安定性,染色体転移によるリンパ性悪性腫瘍に対する感受性の高まりによって特徴づけられるアタキシア・テランジエクタジアを引き起こす.
- 現存する知識は,ATMが細胞サイクルチェックポイントとアポトーシスにおける役割を示唆しているが,これらはATM欠乏症の現象型を完全に説明することはできない.
研究 の 目的:
- 染色体DNAの二重鎖断裂 (DSB) の修復におけるATMの直接的な役割を調査する.
- アタクシア-テランジエクタシアにおける抗原受容体ロシを含む転位を持つリンパ性腫瘍の発生率の増加に基礎となる分子機構を解明する.
主な方法:
- 研究は,リンパ球抗原受容体遺伝子組立の際に修復複合体内のDNA末端を維持するATMの機能に焦点を当てた.
- ATMのDNA修復機能と,細胞サイクルチェックポイントとアポトーシスにおける既知の役割との相互作用を調査した.
主要な成果:
- ATMは,修復複合体のDNA末端を安定させることで,染色体DNADSBの修復に直接参加する.
- この直接的な修復機能は,リンパ球抗原受容体遺伝子組立の間に特に顕著です.
- この発見は,ATMのDNA修復の役割を,そのチェックポイントとアポプトティック活動と統合している.
結論:
- ATMは,DNA損傷反応において,チェックポイント/アポトーシスを活性化させ,DSB修復に直接参加するという二重の役割を果たします.
- このATM機能の包括的な理解は,アタキア・テランジエクタジアの患者におけるリンパ性腫瘍のリスクの増加に対する分子的基礎を提供します.
- この研究は,ATMがゲノム整合性を維持する上で果たす重要な役割を強調しており,特にリンパ球の発達と癌の予備性において重要な役割を果たしている.
関連する概念動画
Fixing Double-strand Breaks
The double-stranded structure of DNA has two major advantages. First, it serves as a safe repository of genetic information where one strand serves as the back-up in case the other strand is damaged. Second, the double-helical structure can be wrapped around proteins called histones to form nucleosomes, which can then be tightly wound to form chromosomes. This way, DNA chains up to 2 inches long can be contained within microscopic structures in a cell. A double-stranded break not only damages...
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...
Homologous Recombination
The basic reaction of homologous recombination (HR) involves two chromatids that contain DNA sequences sharing a significant stretch of identity. One of these sequences uses a strand from another as a template to synthesize DNA in an enzyme-catalyzed reaction. The final product is a novel amalgamation of the two substrates. To ensure an accurate recombination of sequences, HR is restricted to the S and G2 phases of the cell cycle. At these stages, the DNA has been replicated already and the...
Fixing Double-strand Breaks
The double-stranded structure of DNA has two major advantages. First, it serves as a safe repository of genetic information where one strand serves as the back-up in case the other strand is damaged. Second, the double-helical structure can be wrapped around proteins called histones to form nucleosomes, which can then be tightly wound to form chromosomes. This way, DNA chains up to 2 inches long can be contained within microscopic structures in a cell. A double-stranded break not only damages...
Homologous Recombination
The basic reaction of homologous recombination (HR) involves two chromatids that contain DNA sequences sharing a significant stretch of identity. One of these sequences uses a strand from another as a template to synthesize DNA in an enzyme-catalyzed reaction. The final product is a novel amalgamation of the two substrates. To ensure an accurate recombination of sequences, HR is restricted to the S and G2 phases of the cell cycle. At these stages, the DNA has been replicated already and the...
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...
