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相关概念视频

Telomeres and Telomerase02:41

Telomeres and Telomerase

In eukaryotic DNA replication, a single-stranded DNA fragment remains at the end of a chromosome after the removal of the final primer. This section of DNA cannot be replicated in the same manner as the rest of the strand because there is no 3’ end to which the newly synthesized DNA can attach. This non-replicated fragment results in gradual loss of the chromosomal DNA during each cell duplication. Additionally, it can induce a DNA damage response by enzymes that recognize single-stranded DNA.
Telomeres and Telomerase02:41

Telomeres and Telomerase

In eukaryotic DNA replication, a single-stranded DNA fragment remains at the end of a chromosome after the removal of the final primer. This section of DNA cannot be replicated in the same manner as the rest of the strand because there is no 3’ end to which the newly synthesized DNA can attach. This non-replicated fragment results in gradual loss of the chromosomal DNA during each cell duplication. Additionally, it can induce a DNA damage response by enzymes that recognize single-stranded DNA.
Replication in Eukaryotes02:31

Replication in Eukaryotes

Overview
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...
Restarting Stalled Replication Forks02:37

Restarting Stalled Replication Forks

DNA replication is initiated at sites containing predefined DNA sequences known as origins of replication. DNA is unwound at these sites by the minichromosome maintenance (MCM) helicase and other factors such as Cdc45 and the associated GINS complex.The unwound single strands are protected by replication protein A (RPA) until DNA polymerase starts synthesizing DNA at the 5’ end of the strand in the same direction as the replication fork. To prevent the replication fork from falling apart, a...

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相关实验视频

Updated: Jun 18, 2026

Analyzing Telomeric Protein-DNA Interactions Using Single-Molecule Magnetic Tweezers
11:21

Analyzing Telomeric Protein-DNA Interactions Using Single-Molecule Magnetic Tweezers

Published on: August 30, 2024

端粒如何解决末端保护问题

Titia de Lange1

  • 1Laboratory of Cell Biology and Genetics, Rockefeller University, New York, NY 10021, USA. delange@mail.rockefeller.edu

Science (New York, N.Y.)
|December 8, 2009
PubMed
概括
此摘要是机器生成的。

端粒保护真核染色体的末端不会被识别为DNA损伤,防止细胞循环停止并保持基因组完整性. 它们的结构因物种而异,以适应不同的细胞防御机制.

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Telomere Length and Telomerase Activity; A Yin and Yang of Cell Senescence
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Telomere Length and Telomerase Activity; A Yin and Yang of Cell Senescence

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Optimization of Performance Parameters of the TAGGG Telomere Length Assay
08:23

Optimization of Performance Parameters of the TAGGG Telomere Length Assay

Published on: April 21, 2023

相关实验视频

Last Updated: Jun 18, 2026

Analyzing Telomeric Protein-DNA Interactions Using Single-Molecule Magnetic Tweezers
11:21

Analyzing Telomeric Protein-DNA Interactions Using Single-Molecule Magnetic Tweezers

Published on: August 30, 2024

Telomere Length and Telomerase Activity; A Yin and Yang of Cell Senescence
12:08

Telomere Length and Telomerase Activity; A Yin and Yang of Cell Senescence

Published on: May 22, 2013

Optimization of Performance Parameters of the TAGGG Telomere Length Assay
08:23

Optimization of Performance Parameters of the TAGGG Telomere Length Assay

Published on: April 21, 2023

科学领域:

  • 分子生物学分子生物学
  • 遗传学 是一个遗传学.
  • 细胞生物学 细胞生物学

背景情况:

  • 细胞染色体末端存在通过细胞修复途径被识别为DNA损伤的风险.
  • 无法保护染色体末端会导致细胞循环停止,并损害基因组完整性.
  • 端粒是专门的蛋白质-DNA复合体,可以解决染色体末端保护问题.

研究的目的:

  • 阐明端粒伪装染色体末端在哺乳动物细胞中的机制.
  • 为了比较哺乳动物和单细胞真核生物之间的端粒保护策略.
  • 了解DNA损伤反应系统的变化如何影响端粒结构和组成.

主要方法:

  • 涉及哺乳动物细胞系的研究.
  • 在不同真核生物体中对端粒结构和功能的比较分析.
  • 对细胞DNA损伤反应途径的研究.

主要成果:

  • 哺乳动物的端粒使用特定的机制来掩盖染色体末端的DNA损伤传感器.
  • 哺乳动物和单细胞真核生物之间的DNA损伤反应系统存在显著差异.
  • 端粒的结构和组成适应了这些细胞防御系统的特定变异.

结论:

  • 端粒对于防止染色体末端不适当激活DNA损伤反应至关重要.
  • 端粒结构的变化反映了对不同细胞环境和防御机制的进化适应.
  • 了解端粒功能是维持真核生物基因组稳定的关键.