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関連する概念動画

Homologous Recombination02:31

Homologous Recombination

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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...
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Homologous Recombination02:31

Homologous Recombination

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Base-pairing and DNA Repair02:27

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Restarting Stalled Replication Forks02:37

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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,...
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Fixing Double-strand Breaks02:04

Fixing Double-strand Breaks

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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...
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BRCA1-BARD1はRAD51を介した同型DNAのペアリングを促進する.

Weixing Zhao1, Justin B Steinfeld2, Fengshan Liang1,3,4

  • 1Department of Molecular Biophysics and Biochemistry, Yale University School of Medicine, New Haven, Connecticut 06520, USA.

Nature
|October 5, 2017
PubMed
まとめ
この要約は機械生成です。

BRCA1-BARD1腫瘍抑制複合体は,RAD51復合酵素の活性を増強することで,同類復合によるDNA修復に不可欠である. この発見は 癌治療の新たな治療目標を示しています

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Identifying the Effects of BRCA1 Mutations on Homologous Recombination using Cells that Express Endogenous Wild-type BRCA1
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Identifying the Effects of BRCA1 Mutations on Homologous Recombination using Cells that Express Endogenous Wild-type BRCA1

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Real-time Observation of the DNA Strand Exchange Reaction Mediated by Rad51
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Identifying the Effects of BRCA1 Mutations on Homologous Recombination using Cells that Express Endogenous Wild-type BRCA1
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科学分野:

  • 分子生物学
  • 遺伝学
  • 癌 研究

背景:

  • BRCA1-BARD1複合体は,同類再結合によるDNA二重鎖破裂修復に関与する重要な腫瘍抑制剤である.
  • BRCA2-PALB2やRAD51のような他の複合体のテンプレートを作成します

研究 の 目的:

  • BRCA1-BARD1とRAD51の相互作用を調査する
  • BRCA1-BARD1がRAD51を媒介する同型再結合とDNA修復における役割を明らかにする.

主な方法:

  • 野生型と変異したBRCA1-BARD1複合体の浄化と検査
  • DNA結合,RAD51の相互作用,および再結合酵素の活性を評価する生化学的測定法.
  • 同型再結合とDNA修復の効率を評価するための細胞検査.

主要な成果:

  • BRCA1とBARD1はDNAと結合し,RAD51と相互作用する.
  • BRCA1- BARD1は,シナプス複合体の組み立てを促進することによって,RAD51再結合酵素の活性を増強する.
  • BRCA1- BARD1/ RAD51の相互作用が弱まった変異体では,DNAの関節形成と同種の再結合が低下しています.

結論:

  • BRCA1-BARD1は,同種の再結合の間にRAD51の活性を刺激する,必要不可欠な,後期的な役割を果たします.
  • この機能は効率的なDNA修復と腫瘍抑制に不可欠です
  • RAD51とBRCA1-BARD1の相互作用をターゲットにすることは,がん治療の潜在的な戦略です.