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Mutations01:39

Mutations

Overview
Mutations01:39

Mutations

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...
Mutations01:35

Mutations

Mutations are changes in the sequence of DNA. These changes can occur spontaneously or they can be induced by exposure to environmental factors. Mutations can be characterized in a number of different ways: whether and how they alter the amino acid sequence of the protein, whether they occur over a small or large area of DNA, and whether they occur in somatic cells or germline cells.
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...
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...
Spontaneous and Induced Mutations01:30

Spontaneous and Induced Mutations

Spontaneous mutations arise infrequently during DNA replication due to errors in the process. A key factor behind these errors is tautomeric shifts in nitrogenous bases, where bases transition from keto to enol forms or amino to imino forms. This shift can alter base-pairing rules, leading to mutations. Additionally, reactive oxygen species (ROS) arising from aerobic metabolism can damage DNA, resulting in depurination (loss of a purine base) or depyrimidination (loss of a pyrimidine base).

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Updated: Jul 12, 2026

Visualizing and Quantifying Endonuclease-Based Site-Specific DNA Damage
10:59

Visualizing and Quantifying Endonuclease-Based Site-Specific DNA Damage

Published on: August 21, 2021

ミオトニック・ディストロフィーの不安定なDNA配列

H G Harley1, S A Rundle, W Reardon

  • 1Institute of Medical Genetics, University of Wales College of Medicine, Heath Park, Cardiff, UK.

Lancet (London, England)
|May 9, 1992
PubMed
まとめ

研究者らは,ミオトニック・ディストロフィーに関連した変数DNA配列を特定した. この分子欠陥は,この遺伝的障害に罹患している家族の診断と遺伝カウンセリングに役立ちます.

科学分野:

  • 遺伝学 遺伝学とは
  • 分子生物学は分子生物学である.
  • 神経学 神経学とは

背景:

  • ミオトニック・ディストロフィー (Myotonic dystrophy) は,筋肉の弱さと衰えを特徴とする遺伝疾患です.
  • 変数DNA配列は,ミオトニックジストロフィーの患者で観察されています.

研究 の 目的:

  • 特定の分子欠陥を特定することで,ミオトニック・ディストロフィーの臨床管理が改善されるかどうかを判断する.
  • DNA配列の膨張と疾患の重症度の間の相関を調査する.

主な方法:

  • ミオトニック・ディストロフィーの患者127人と,健康な対照群73人を研究した.
  • 変数DNA配列を検出・測定するためにDNA断片を分析した.

主要な成果:

  • 拡張DNA断片は,すべての患者に発見されましたが,対照群ではそうではありませんでした.
  • DNA断片の長さの増加は,疾患の重症度と相関していた.
  • 配列の拡張は,家族内の連続する世代にわたって観察され,予想を説明しました.

結論:

  • この特定のDNA欠陥の特定は,ミオトニック・ディストロフィーの正確な診断に役立ちます.

さらに関連する動画

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Quantifying Replication Stress in Ovarian Cancer Cells Using Single-Stranded DNA Immunofluorescence

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Visualizing Single-Stranded DNA Foci in the G1 Phase of the Cell Cycle
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Visualizing Single-Stranded DNA Foci in the G1 Phase of the Cell Cycle

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関連する実験動画

Last Updated: Jul 12, 2026

Visualizing and Quantifying Endonuclease-Based Site-Specific DNA Damage
10:59

Visualizing and Quantifying Endonuclease-Based Site-Specific DNA Damage

Published on: August 21, 2021

Quantifying Replication Stress in Ovarian Cancer Cells Using Single-Stranded DNA Immunofluorescence
06:25

Quantifying Replication Stress in Ovarian Cancer Cells Using Single-Stranded DNA Immunofluorescence

Published on: February 10, 2023

Visualizing Single-Stranded DNA Foci in the G1 Phase of the Cell Cycle
08:30

Visualizing Single-Stranded DNA Foci in the G1 Phase of the Cell Cycle

Published on: December 22, 2023

  • この発見は,欠陥の基礎として不安定な繰り返し配列を裏付けている.
  • 結果は,被災者の家族に対する遺伝カウンセリングに役立つでしょう.