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関連する概念動画

Nucleotide Excision Repair01:08

Nucleotide Excision Repair

Overview
Overview of DNA Repair02:25

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...
Base Excision Repair01:54

Base Excision Repair

One of the common DNA damages is the chemical alteration of single bases by alkylation, oxidation, or deamination. The altered bases cause mispairing and strand breakage during replication. This type of damage causes minimal change to the DNA double helix structure and can be repaired by the base excision repair (BER) pathways. BER corrects damaged DNA sequences by removing the damaged base and restoring the original base sequence using the complementary strand as a template.
The first step of...
Fixing Double-strand Breaks02:04

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...
Single-Strand DNA Binding Proteins01:03

Single-Strand DNA Binding Proteins

For successful DNA replication, the unwinding of double-stranded DNA must be accompanied by stabilization and protection of the separated single strands of the DNA. This crucial task is performed by single-strand DNA-binding (SSB) proteins. They bind to the DNA in a sequence-independent manner, which means that the nitrogenous bases of the DNA need not be present in a specific order for binding of SSB proteins to it. The binding of SSB proteins straightens single-stranded DNA (ssDNA) and makes...
Fixing Double-strand Breaks02:04

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...

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関連する実験動画

Updated: Jul 26, 2026

Synthesis of Wavelength-shifting DNA Hybridization Probes by Using Photostable Cyanine Dyes
07:44

Synthesis of Wavelength-shifting DNA Hybridization Probes by Using Photostable Cyanine Dyes

Published on: July 6, 2016

切断されたおよび切断されていないクロマチンのDNA構造.

C Nicolini, R Baserga, F Kendall

    Science (New York, N.Y.)
    |May 21, 1976
    PubMed
    まとめ

    超音波および均質化などのクロマチンの切断方法は,構造的人工物を生み出します. これらの変化は,エチジウムブロミド結合,円形二重化,光散乱分析によって検出されます.

    科学分野:

    • バイオケミストリー バイオケミストリー
    • 分子生物学は分子生物学である.
    • 構造生物学 構造生物学とは

    背景:

    • クロマチンの構造は,DNAの調節に不可欠です.
    • 物理的な方法を使用して,研究のためにクロマチンを分離します.
    • 潜在的な人工物を理解することは,正確な解釈に不可欠です.

    研究 の 目的:

    • クロマチンの切断によってもたらされた構造的人工物を特定し,特徴づけること.
    • 一般的な剪定技術の信頼性を評価する.

    主な方法:

    • 染色体サンプルは,超音波処理と渦型均質化が行われました.
    • エチジウムブロミド結合アッセイが実施されました.
    • 円形の二重化 (CD) スペクトロスコピーを利用した.
    • 微分光散射 (DLS) を測定した.

    主要な成果:

    • 剪定により,エチジウムブロミド結合部位が著しく増加し,DNA損傷または解き放たれを示しています.
    • 円形の二重化スペクトルは,剪定後の実質的な変化を示し,形状の変化を示唆しました.
    • 切断後の差分光散は減少し,構造的整合性の喪失を暗示しています.

    さらに関連する動画

    Determining if DNA Stained with a Cyanine Dye Can Be Digested with Restriction Enzymes
    06:58

    Determining if DNA Stained with a Cyanine Dye Can Be Digested with Restriction Enzymes

    Published on: February 2, 2018

    CD Spectroscopy to Study DNA-Protein Interactions
    06:48

    CD Spectroscopy to Study DNA-Protein Interactions

    Published on: February 10, 2022

    関連する実験動画

    Last Updated: Jul 26, 2026

    Synthesis of Wavelength-shifting DNA Hybridization Probes by Using Photostable Cyanine Dyes
    07:44

    Synthesis of Wavelength-shifting DNA Hybridization Probes by Using Photostable Cyanine Dyes

    Published on: July 6, 2016

    Determining if DNA Stained with a Cyanine Dye Can Be Digested with Restriction Enzymes
    06:58

    Determining if DNA Stained with a Cyanine Dye Can Be Digested with Restriction Enzymes

    Published on: February 2, 2018

    CD Spectroscopy to Study DNA-Protein Interactions
    06:48

    CD Spectroscopy to Study DNA-Protein Interactions

    Published on: February 10, 2022

    結論:

    • 超音波と渦の均質化は,クロマチンの重要な構造的人工物を導入します.
    • これらのアーティファクトは,生体物理学的技術を使用して検出することができます.
    • 研究者は,切断されたクロマチンのサンプルから得られたデータを解釈する際には注意を払うべきです.