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Replicative Cell Senescence02:15

Replicative Cell Senescence

Replicative cell senescence is a property of cells that allows them to divide a finite number of times throughout the organism's lifespan while preventing excessive proliferation. Replicative senescence is associated with the gradual loss of the telomere — short, repetitive DNA sequences found at the end of the chromosomes. Telomeres are bound by a group of proteins to form a protective cap on the ends of chromosomes. Embryonic stem cells express telomerase — an enzyme that adds the telomeric...
Replication in Eukaryotes01:29

Replication in Eukaryotes

In eukaryotic cells, DNA replication is highly conserved and tightly regulated. Multiple linear chromosomes must be duplicated with high fidelity before cell division, so there are many proteins that fulfill specialized roles in the replication process. Replication occurs in three phases: initiation, elongation, and termination, and ends with two complete sets of chromosomes in the nucleus.
Many Proteins Orchestrate Replication at the Origin
Eukaryotic replication follows many of the same...
Replicative Cell Senescence02:15

Replicative Cell Senescence

Replicative cell senescence is a property of cells that allows them to divide a finite number of times throughout the organism's lifespan while preventing excessive proliferation. Replicative senescence is associated with the gradual loss of the telomere — short, repetitive DNA sequences found at the end of the chromosomes. Telomeres are bound by a group of proteins to form a protective cap on the ends of chromosomes. Embryonic stem cells express telomerase — an enzyme that adds the telomeric...

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Updated: May 8, 2026

Studying Age-dependent Genomic Instability using the S. cerevisiae Chronological Lifespan Model
08:46

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Published on: September 29, 2011

酵母老化におけるゲノム不安定性の増加

Serge Gravel1, Stephen P Jackson

  • 1The Wellcome Trust/Cancer Research, UK.

Cell
|October 9, 2003
PubMed
まとめ
この要約は機械生成です。

老化した酵母細胞は,DNAの二重鎖の断裂修復が損なわれているため,ヘテロジゴシティの損失が増加しています. この研究は,老化がどのように真核細胞のゲノム不安定に寄与するかを明らかにしています.

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Continuous High-resolution Microscopic Observation of Replicative Aging in Budding Yeast

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Combining Magnetic Sorting of Mother Cells and Fluctuation Tests to Analyze Genome Instability During Mitotic Cell Aging in Saccharomyces cerevisiae
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Combining Magnetic Sorting of Mother Cells and Fluctuation Tests to Analyze Genome Instability During Mitotic Cell Aging in Saccharomyces cerevisiae

Published on: October 16, 2014

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Last Updated: May 8, 2026

Studying Age-dependent Genomic Instability using the S. cerevisiae Chronological Lifespan Model
08:46

Studying Age-dependent Genomic Instability using the S. cerevisiae Chronological Lifespan Model

Published on: September 29, 2011

Continuous High-resolution Microscopic Observation of Replicative Aging in Budding Yeast
10:41

Continuous High-resolution Microscopic Observation of Replicative Aging in Budding Yeast

Published on: August 20, 2013

Combining Magnetic Sorting of Mother Cells and Fluctuation Tests to Analyze Genome Instability During Mitotic Cell Aging in Saccharomyces cerevisiae
11:08

Combining Magnetic Sorting of Mother Cells and Fluctuation Tests to Analyze Genome Instability During Mitotic Cell Aging in Saccharomyces cerevisiae

Published on: October 16, 2014

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.
  • 細胞生物学 細胞生物学

背景:

  • ゲノム不安定は老化の特徴である.
  • 年齢に関連したゲノム不安定性の基礎にある分子メカニズムを理解することは極めて重要です.

研究 の 目的:

  • 酵母における老化とゲノム不安定性の関係を調査する.
  • 老いた細胞で影響を受ける特定のDNA修復プロセスを決定する.

主な方法:

  • イーストのモデル生物 (Saccharomyces cerevisiae) を利用しました.
  • 年老いた細胞と若い細胞におけるヘテロジゴシティの喪失率の評価.
  • DNAの二重鎖の断裂検出と修復経路を調べました.

主要な成果:

  • 老化した酵母細胞は,ヘテロジゴシティの喪失率が著しく高かった.
  • この増加は,DNA二重鎖の断裂を検知・修復する能力の低下と相関していた.
  • 証拠によると,細胞の年齢とともにDNA修復効率が低下することが示唆されています.

結論:

  • イーストの老化は,ゲノム不安定性の増加と関連しています.
  • DNAのダブルストランド断裂修復の障害は,この不安定性に寄与する重要な要因です.
  • これらの発見は,老化プロセスとその影響がユカリオットのゲノム整合性への洞察を提供します.