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相关概念视频

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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相关实验视频

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

在肌性衰变中不稳定的DNA序列.

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
概括

研究人员确定了一种与肌性衰变相关的可变DNA序列. 这种分子缺陷有助于对受这种遗传疾病影响的家庭进行诊断和遗传咨询.

科学领域:

  • 遗传学 是一个遗传学.
  • 分子生物学分子生物学
  • 神经学 神经学

背景情况:

  • 肌性发育不良是一种遗传性疾病,其特征是肌肉疲弱和衰竭.
  • 一个可变的DNA序列已被观察到在患有肌性损伤的患者.

研究的目的:

  • 为了确定确定特定的分子缺陷是否有助于改善肌性营养不良的临床管理.
  • 为了研究DNA序列扩张和疾病严重程度之间的相关性.

主要方法:

  • 研究了127名肌性缩症患者和73名健康对照人群.
  • 分析DNA碎片以检测和测量可变DNA序列.

主要成果:

  • 在所有受影响的患者中都发现了扩展的DNA片段,但不是对照组.
  • DNA片段长度的增加与疾病严重程度相关.
  • 序列扩张在家族内连续几代人中被观察到,这解释了预期.

结论:

  • 鉴定这种特定的DNA缺陷有助于准确诊断肌性衰变.
  • 这一发现支持不稳定的重复序列作为缺陷的基础.
  • 结果将有助于为受影响的家庭提供遗传咨询.

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