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Replication in Eukaryotes01:29

Replication in Eukaryotes

13.0K
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...
13.0K
Telomeres and Telomerase02:41

Telomeres and Telomerase

23.0K
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...
23.0K
Replicative Cell Senescence02:15

Replicative Cell Senescence

3.6K
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...
3.6K
Restarting Stalled Replication Forks02:37

Restarting Stalled Replication Forks

5.7K
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,...
5.7K
Inheritance of Chromatin Structures03:17

Inheritance of Chromatin Structures

6.2K
Epigenetics is the study of inherited changes in a cell's phenotype without changing the DNA sequences. It provides a form of memory for the differential gene expression pattern to maintain cell lineage, position-effect variegation, dosage compensation, and maintenance of chromatin structures such as telomeres and centromeres. For example, the structure and location of the centromere on chromosomes are epigenetically inherited. Its functionality is not dictated or ensured by the underlying...
6.2K
Life Histories01:29

Life Histories

17.8K
Overview
17.8K

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相关实验视频

Updated: May 30, 2025

Author Spotlight: Exploring the Impact of Trauma on Cellular Aging
11:44

Author Spotlight: Exploring the Impact of Trauma on Cellular Aging

Published on: March 22, 2024

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一个跨代端粒长度动态的分支模型.

Athanasios Benetos1,2, Olivier Coudray3, Anne Gégout-Petit3

  • 1Université de Lorraine, Inserm, DCAC, 54000, Nancy, France.

Journal of mathematical biology
|January 26, 2025
PubMed
概括
此摘要是机器生成的。

这项研究使用分支过程模拟了跨代的端粒长度演变. 数字模拟探索生物因素如何影响这个遗传特征随着时间的推移.

关键词:
老化结构模型的结构化模型.分支的过程分支过程.人口动态 人口动态准静止分布的分布端粒的动态 端粒的动态

更多相关视频

Modified Terminal Restriction Fragment Analysis for Quantifying Telomere Length Using In-gel Hybridization
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Modified Terminal Restriction Fragment Analysis for Quantifying Telomere Length Using In-gel Hybridization

Published on: July 10, 2017

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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

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相关实验视频

Last Updated: May 30, 2025

Author Spotlight: Exploring the Impact of Trauma on Cellular Aging
11:44

Author Spotlight: Exploring the Impact of Trauma on Cellular Aging

Published on: March 22, 2024

1.5K
Modified Terminal Restriction Fragment Analysis for Quantifying Telomere Length Using In-gel Hybridization
11:29

Modified Terminal Restriction Fragment Analysis for Quantifying Telomere Length Using In-gel Hybridization

Published on: July 10, 2017

12.8K
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

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科学领域:

  • 人口遗传学 人口遗传学
  • 进化生物学 进化生物学
  • 计算生物学 计算生物学

背景情况:

  • 端粒长度是细胞衰老和生物体寿命的关键因素.
  • 了解端粒长度的进化动态对于理解人口层面的衰老过程至关重要.

研究的目的:

  • 开发和分析一种基于代理的模型,模拟人口中的端粒长度演变.
  • 为了研究这个进化模型的马尔修斯参数.
  • 探索关键生物参数对端粒长度动态的影响.

主要方法:

  • 使用连续时间类型分支过程构建基于个体的模型.
  • 整合个体特征,如配体平均端粒长度和年龄.
  • 应用数值模拟来分析模型行为.

主要成果:

  • 该模型表现出马尔图斯行为,反映出受端粒长度影响的人口增长动态.
  • 数字模拟证明了特定生物参数对端粒长度进化的显著影响.
  • 该研究提供了关于代际传播和端粒长度变化的见解.

结论:

  • 开发的分支过程模型为研究端粒长度演变提供了一个强大的框架.
  • 生物相关的参数在塑造人口水平端粒长度趋势方面发挥着至关重要的作用.
  • 这项研究有助于更深入地了解衰老的遗传和进化基础.