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相关概念视频

Cancers Originate from Somatic Mutations in a Single Cell02:21

Cancers Originate from Somatic Mutations in a Single Cell

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Cancer arises from mutations in the critical genes that allow healthy cells to escape cell cycle regulation and acquire the ability to proliferate indefinitely. Though originating from a single mutation event in one of the originator cells, cancer progresses when the mutant cell lines continue to gain more and more mutations, and finally, become malignant. For example, chronic myelogenous leukemia (CML) develops initially as a non-lethal increase in white blood cells, which progressively...
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Mutations01:39

Mutations

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Spontaneous and Induced Mutations01:30

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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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Mismatch Repair01:20

Mismatch Repair

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Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
The Mutator Protein Family Plays a Key Role in DNA Mismatch Repair
The human genome has more than 3 billion base pairs of DNA per cell. Prior to cell division, that vast amount of genetic...
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Mutations in Microorganisms01:18

Mutations in Microorganisms

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Mutations are heritable changes in an organism’s genome involving alterations in the base sequence of DNA or RNA. These changes can influence cellular processes and phenotypic traits, potentially transforming the unaltered wild type into a mutant form. Such changes, termed forward mutations, are pivotal in shaping the genetic diversity of organisms.RNA viruses exhibit the highest mutation rates due to the absence of robust proofreading mechanisms during genome replication. In contrast,...
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相关实验视频

Updated: Nov 7, 2025

Detecting Somatic Genetic Alterations in Tumor Specimens by Exon Capture and Massively Parallel Sequencing
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单个分子分辨率的体质突变景观

Federico Abascal1, Luke M R Harvey1, Emily Mitchell1,2

  • 1Wellcome Sanger Institute, Hinxton, UK.

Nature
|April 29, 2021
PubMed
概括
此摘要是机器生成的。

人体突变,细胞中的DNA变化, 是癌症和衰老的关键. 新的纳米级测序 (NanoSeq) 允许在单细胞中检测这些突变,揭示了组织突变的洞察力.

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科学领域:

  • 遗传学
  • 分子生物学
  • 癌症研究

背景情况:

  • 身体突变在癌症,衰老和疾病发展中至关重要.
  • 在单个细胞中检测低频率的体质突变是一个重大挑战,研究仅限于特定的组织.
  • 了解不同细胞类型和条件的体质突变是必不可少的.

研究的目的:

  • 开发一种高度敏感的测序方法来检测低频率的体质突变.
  • 研究各种组织的体质突变负载和特征,包括未分裂的细胞.
  • 为了比较细胞分裂与非分裂的突变发生,以及干细胞与分化细胞的发生.

主要方法:

  • 开发纳米级测序 (NanoSeq),一种双重测序协议.
  • 在单个分子水平上实现极低的误差率 (<5个误差/十亿个基因对).
  • 在干细胞,分化细胞,神经元和光滑肌肉中研究NanoSeq的应用.

主要成果:

  • 在任何组织中,NanoSeq可以研究体质突变,而不依赖于克隆性.
  • 不管细胞分裂史如何,分化的血液和结肠细胞表现出与干细胞相似的突变负载和特征.
  • 转基因后的神经元和光滑肌肉细胞在整个生命中以恒定的速度积累体质突变,与转基因活跃的组织相似.

结论:

  • 细胞分裂不是体质突变的唯一驱动因素;非细胞分裂依赖的过程是显著的贡献者.
  • 在像神经元这样的非分裂细胞中不断积累体内突变.
  • 检测单分子DNA突变的能力可以彻底改变体质突变的研究,并使大规模的非侵入性队列研究成为可能.