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関連する概念動画

Mismatch Repair01:36

Mismatch Repair

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Overview
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Overview of DNA Repair02:25

Overview of DNA Repair

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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.
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Base Excision Repair01:54

Base Excision Repair

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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...
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Sanger Sequencing01:57

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DNA sequencing is a fundamental technique that is routinely used in the biological sciences. This method can be applied to a range of questions at different scales - from the sequencing of a cloned DNA fragment or the study of a mutation in a gene up to whole-genome sequencing. However, despite the widespread use of sequencing today, it was not until 1977 that Fredrick Sanger and his collaborators developed the chain-termination method to decode DNA sequences. It relies on the separation of a...
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Fixing Double-strand Breaks02:04

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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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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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Proofreading and DNA Repair Assay Using Single Nucleotide Extension and MALDI-TOF Mass Spectrometry Analysis
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単一分子の配列解析によって明らかになったDNAの不一致と損傷パターン

Mei Hong Liu1,2, Benjamin M Costa1,2, Emilia C Bianchini1,2

  • 1Center for Human Genetics and Genomics, New York University Grossman School of Medicine, New York, NY, USA.

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|June 12, 2024
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まとめ

科学者たちは新しいDNAシーケンシング方法である HiDEF-seq を開発し 単一分子レベルで DNAの早期損傷を検出しました この発見は 癌や老化を 引き起こす突然変異の起源を 特定するのに役立ちます

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Using Next Generation Sequencing to Identify Mutations Associated with Repair of a CAS9-induced Double Strand Break Near the CD4 Promoter
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科学分野:

  • ゲノミクス
  • 分子生物学
  • 癌 研究

背景:

  • ゲノム突然変異は生涯にわたって蓄積され 癌やその他の病気を引き起こします
  • ほとんどの突然変異は 単一鎖のDNAで発生しますが 現在の配列決定方法は 解明に困難です
  • これらの最初の出来事を理解することは 変異の起源を解読するのに不可欠です

研究 の 目的:

  • 単一鎖DNAの損傷と不一致を高精度で検出できる新しいシーケンシング技術を開発する.
  • 単一鎖の変異シグネチャを特徴付け,既知の二鎖の変異シグネチャとリンクする.
  • 癌や老化をはじめとする様々な状況における突然変異のメカニズムを調査する.

主な方法:

  • ヘアピン・デュプレックス・エンハンスド・フィデリティ・シーケンシング (HiDEF-seq) の開発,単一分子,ロングリードのシーケンシング方法.
  • 癌の予備症候群を持つ個人を含む134種類の組織サンプルをプロファイリングした.
  • シングル・ストランドの不一致とダメージシグネチャーの分析. サイトシン・デアミネーションとAPOBEC3Aの活性を含む.

主要な成果:

  • HiDEF-seqは,塩基置換とサイトシン脱アミネーションの単一分子の精度を達成する.
  • シングル・ストランドとダブル・ストランドの変異シグネチャーの間の対応が確立され, 初期病変を解決した.
  • 異なる修復欠陥を持つ腫瘍の単一鎖不一致パターンを特定し,APOBEC3Aダメージシグネチャーを定義した.
  • ミトコンドリアゲノムの変異性メカニズムについての洞察を提供した.

結論:

  • HiDEF-seqは,前例のない解像度で初期単一鎖DNAイベントの検出を可能にします.
  • この技術は癌,老化,その他の病気の状況における変異の起源を明らかにすることができます.
  • 単一鎖の事件を解決することは,二鎖の変異を超えた完全な変異プロセスを理解する鍵です.