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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

Spontaneous and Induced Mutations

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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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Updated: Nov 7, 2025

Detecting Somatic Genetic Alterations in Tumor Specimens by Exon Capture and Massively Parallel Sequencing
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単一分子解像度での体質変異の風景

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

  • 1Wellcome Sanger Institute, Hinxton, UK.

Nature
|April 29, 2021
PubMed
まとめ
この要約は機械生成です。

体内の変異 つまり細胞のDNAの変化は 癌や老化の鍵となります 新しいナノレートシーケンシング (NanoSeq) は,単細胞でのこれらの変異の検出を可能にし,組織変異の洞察を明らかにします.

さらに関連する動画

Visualizing Genetic Variants, Short Targets, and Point Mutations in the Morphological Tissue Context with an RNA In Situ Hybridization Assay
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Visualizing Genetic Variants, Short Targets, and Point Mutations in the Morphological Tissue Context with an RNA In Situ Hybridization Assay

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Single Cell Analysis Of Transcriptionally Active Alleles By Single Molecule FISH
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Detecting Somatic Genetic Alterations in Tumor Specimens by Exon Capture and Massively Parallel Sequencing
11:02

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Visualizing Genetic Variants, Short Targets, and Point Mutations in the Morphological Tissue Context with an RNA In Situ Hybridization Assay
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Single Cell Analysis Of Transcriptionally Active Alleles By Single Molecule FISH
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Single Cell Analysis Of Transcriptionally Active Alleles By Single Molecule FISH

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科学分野:

  • 遺伝学
  • 分子生物学
  • 癌 研究

背景:

  • 体内の突然変異は 癌や老化や病気の発生に 重要な役割を果たします
  • 単細胞での低頻度の体内変異の検出は,特定の組織への研究を制限する重要な課題でした.
  • 多様な細胞タイプと状態における体内変異の理解は不可欠である.

研究 の 目的:

  • 低頻度の体変異を検出するための非常に敏感なシーケンシング方法を開発する.
  • 非分裂細胞を含む様々な組織における体変異負荷とシグネチャーを調査する.
  • 分裂する vs 分裂しない細胞と分化した vs 幹細胞の変異を比較する.

主な方法:

  • ナノレートシーケンシング (NanoSeq) の開発,二重シーケンシングプロトコル.
  • 単一分子レベルで超低誤差率 (<5誤差/億塩基対) を達成する.
  • NanoSeqの適用は,幹細胞,分化細胞,ニューロン,および滑らかな筋肉の体内の変異を研究する.

主要な成果:

  • NanoSeqは,クローナリティとは関係なく,どんな組織でも体内の変異を研究することができます.
  • 分化された血液と結腸細胞は,細胞分裂歴に関係なく,幹細胞と似た変異負荷とシグネチャを示している.
  • 転移後の神経細胞と滑らかな筋肉細胞は,転移後活性組織と比べて,生涯を通じて一定の速度で体内の変異を蓄積する.

結論:

  • 細胞分裂は体変異の唯一の要因ではなく,分裂に依存しない過程が重要な要因である.
  • 体の変異は神経細胞のように 分裂しない細胞に絶えず蓄積されます
  • 単一分子DNA変異を検出する能力は,体内の変異性の研究に革命をもたらし,大規模な非侵襲的なコホート研究を可能にします.