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Homologous Recombination

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...

Nucleotide Excision Repair

Nucleotide Excision Repair

Nucleotide Excision Repair

Nucleotide Excision Repair

DNA Distortion and Damage
Cells are regularly exposed to mutagens—factors in the environment that can damage DNA and generate mutations. UV radiation is one of the most common mutagens and is estimated to introduce a significant number of changes in DNA. These include bends or kinks in the structure, which can block DNA replication or transcription. If these errors are not fixed, the damage can cause mutations, which in turn can result in cancer or disease depending on which sequences are...

Nucleotide Excision Repair

Nucleotide Excision Repair

No description available

Overview of DNA Repair

Overview of DNA Repair

In order to be passed through generations, genomic DNA must be undamaged and error-free. However, every day, DNA in a cell undergoes several thousand to a million damaging events by natural causes and external factors. Ionizing radiation such as UV rays, free radicals produced during cellular respiration, and hydrolytic damage from metabolic reactions can alter the structure of DNA. Damages caused include single-base alteration, base dimerization, chain breaks, and cross-linkage.
Chemically...

Overview of DNA Repair

Overview of DNA Repair

No description available

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関連する実験動画

Updated: Mar 14, 2026

Visualizing and Quantifying Endonuclease-Based Site-Specific DNA Damage

Visualizing and Quantifying Endonuclease-Based Site-Specific DNA Damage

Published on: August 21, 2021

RNAテンプレートによるDNA修復

Francesca Storici¹, Katarzyna Bebenek, Thomas A Kunkel

¹Laboratory of Molecular Genetics, National Institute of Environmental Health Sciences (NIH, DHHS), Research Triangle Park, North Carolina 27709, USA.

|April 13, 2007

まとめ

この研究は,RNAが酵母におけるDNA二重鎖断裂 (DSB) の修復のためにDNA合成を直接テンプレート化できることを示しています. この発見は,DNA修復中のRNA-DNA相互作用による遺伝情報伝達の新しいメカニズム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.
遺伝学遺伝学とは
DNA修復メカニズムについて

背景:

RNAは,逆転写とテロメア延長のような特定のプロセスにおけるDNA合成のテンプレートとして機能します.
以前は,染色体DNAの二重鎖断裂 (DSB) 修復におけるRNAの役割は,cDNA中間体を含む間接的と考えられていた.
RNAによるDNA修復の直接的なテンプレートは,in vivoでは実証されていない.

研究の目的:

染色体DSB修復中のDNA合成を直接テンプレートするRNAの可能性を調査する.
RNAが同種の再結合媒介修復のテンプレートとして機能できるかどうかを判断する.

主な方法:

酵母Saccharomyces cerevisiaeのモデルシステムを活用したものです.
壊れたDNAの末端を補完するRNAオリゴヌクレオチドを使用します.
確立された分子生物学技術を使用してDNA合成と修復結果を評価する.

主要な成果:

RNAオリゴヌクレオチドが酵母における染色体DSBを修復するためのDNA合成を直接テンプレート化することが示された.
酵母複製DNAポリメラーゼがRNAテンプレートトラクタをコピーできることを示しました.

さらに関連する動画

Assessment of Global DNA Double-Strand End Resection using BrdU-DNA Labeling coupled with Cell Cycle Discrimination Imaging

Assessment of Global DNA Double-Strand End Resection using BrdU-DNA Labeling coupled with Cell Cycle Discrimination Imaging

Published on: April 28, 2021

Visualization of DNA Repair Proteins Interaction by Immunofluorescence

Visualization of DNA Repair Proteins Interaction by Immunofluorescence

Published on: June 26, 2020

関連する実験動画

Last Updated: Mar 14, 2026

Visualizing and Quantifying Endonuclease-Based Site-Specific DNA Damage

Visualizing and Quantifying Endonuclease-Based Site-Specific DNA Damage

Published on: August 21, 2021

Assessment of Global DNA Double-Strand End Resection using BrdU-DNA Labeling coupled with Cell Cycle Discrimination Imaging

Assessment of Global DNA Double-Strand End Resection using BrdU-DNA Labeling coupled with Cell Cycle Discrimination Imaging

Published on: April 28, 2021

Visualization of DNA Repair Proteins Interaction by Immunofluorescence

Visualization of DNA Repair Proteins Interaction by Immunofluorescence

Published on: June 26, 2020

修復のためのRNAと染色体DNAの間の直接の同類相互作用が確立された.

結論:

RNAは,染色体DSB修復 in vivoの間にDNA合成の直接的なテンプレートとして機能することができます.
この研究は,DNA修復中にRNAからDNAへの遺伝情報転送のための新しい経路を明らかにしています.
この発見は,テンプレート修復プロセスにおけるDNAの独占的な役割に関する以前の仮定に異議を唱えている.