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Dihybrid Crosses01:18

Dihybrid Crosses

Overview
Mismatch Repair01:36

Mismatch Repair

Overview
Mutation, Gene Flow, and Genetic Drift01:09

Mutation, Gene Flow, and Genetic Drift

In a population that is not at Hardy-Weinberg equilibrium, the frequency of alleles changes over time. Therefore, any deviations from the five conditions of Hardy-Weinberg equilibrium can alter the genetic variation of a given population. Conditions that change the genetic variability of a population include mutations, natural selection, non-random mating, gene flow, and genetic drift (small population size).
Trihybrid Crosses02:27

Trihybrid Crosses

Trihybrid Crosses
Some of Mendel’s crosses examined three pairs of contrasting characteristics. Such a cross is called a trihybrid cross. A trihybrid cross is a combination of three individual monohybrid crosses. For example, plant height (tall vs. short), seed shape (round vs. wrinkled), and seed color (yellow vs. green).
The F1 generation plants of a trihybrid cross are heterozygous for all three traits and produce eight gametes. Upon self-fertilization, these gametes have an equal chance to...
Genome Copying Errors02:46

Genome Copying Errors

DNA replication is a well-evolved process that copies millions of base pairs with high fidelity during each cell division. Occasionally a wrong base or a long stretch of wrong bases may get added to the daughter strands. If the errors are left unchecked, cells might accumulate several mutations that might endanger their  survival. Therefore, the copying errors are checked and repaired at three levels.
Mismatch Repair01:20

Mismatch Repair

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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関連する実験動画

Updated: May 20, 2026

Protocols for CRISPR/Cas9 Mutagenesis of the Oriental Fruit Fly Bactrocera dorsalis
08:19

Protocols for CRISPR/Cas9 Mutagenesis of the Oriental Fruit Fly Bactrocera dorsalis

Published on: September 28, 2022

テロメア機能障害は,突然変異率とゲノム不安定性を高めます.

J A Hackett1, D M Feldser, C W Greider

  • 1Predoctoral Training Program in Human Genetics and Molecular Biology, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA.

Cell
|August 18, 2001
PubMed
まとめ
この要約は機械生成です。

テロメラーゼの欠乏によって引き起こされるテロメア機能障害は,突然変異率と遺伝的不安定性を著しく増加させます. イーストでのこの研究は,テロメラーゼを明らかにしています.

さらに関連する動画

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The Golden Apple Snail Pomacea canaliculata: From Zygotes to Stable Mutant Lines
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The Golden Apple Snail Pomacea canaliculata: From Zygotes to Stable Mutant Lines

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関連する実験動画

Last Updated: May 20, 2026

Protocols for CRISPR/Cas9 Mutagenesis of the Oriental Fruit Fly Bactrocera dorsalis
08:19

Protocols for CRISPR/Cas9 Mutagenesis of the Oriental Fruit Fly Bactrocera dorsalis

Published on: September 28, 2022

Breeding by Design for Functional Rice with Genome Editing Technologies
09:43

Breeding by Design for Functional Rice with Genome Editing Technologies

Published on: January 3, 2025

The Golden Apple Snail Pomacea canaliculata: From Zygotes to Stable Mutant Lines
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科学分野:

  • 分子生物学は分子生物学である.
  • 遺伝学 遺伝学とは
  • 細胞生物学 細胞生物学

背景:

  • テロメア機能障害は,腫瘍発生率の増加とマウスの遺伝的不安定に関連しています.
  • テロメラーゼはテロメアの長さと安定性を維持する上で重要な役割を果たします.

研究 の 目的:

  • テロメア機能障害と遺伝的不安定性との関連を直接調査する.
  • テロメラーゼ欠乏が,Saccharomyces cerevisiaeの変異率に及ぼす影響を決定する.

主な方法:

  • 機能不全のテロメアを持つ est1Delta酵母菌株のCAN1遺伝子における変異率の評価.
  • 末端デレーションや染色体融合を含む変異の種類を分析する.
  • テロメアの修復メカニズム,例えば断裂誘発複製を調査する.

主要な成果:

  • 変異率は,機能不全のテロメアを持つ est1Delta 株で10~100倍増加した.
  • 変異率の増加は,主に末端欠損の頻度が高いことによる.
  • 染色体融合と複雑な再編成の証拠は,破裂-融合-橋渡しメカニズムやその他の不安定な経路を示唆しています.

結論:

  • テロメラーゼの欠如は,重大な染色体不安定につながる.
  • テロメア機能障害は,遺伝的不安定性を直接誘発する.
  • テロメラーゼは染色体不安定性の阻害剤として作用する.