関連する実験動画
Updated: Jul 10, 2026
12:08
Telomere Length and Telomerase Activity; A Yin and Yang of Cell Senescence
Published on: May 22, 2013
テロメアにおけるスイッチングとシグナル伝達
1Department of Biochemistry and Biophysics, University of California, San Francisco, 94143, USA. telomer@itsa.ucsf.edu
Cell
|September 27, 2001
まとめ
このレビューは,真核染色体上の保護性DNA-タンパク質複合体であるテロメアについて詳細に説明します. その機能,テロメラーゼによる合成,そしてこれらの機能が損なわれたときの細胞の反応を研究しています.
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:
- テロメアは,エウカリオスの染色体末端を封じる保護性DNA-タンパク質複合体である.
- テロメアの整合性は,ゲノムの安定性と細胞老化を防ぐために極めて重要です.
- テロメラーゼは,テロメア DNA 配列を合成する酵素です.
研究 の 目的:
- テロメアの構造的組織をレビューする.
- テロメア機能の基礎となる分子機構を記述する.
- テロメアおよびテロメラーゼ機能の障害に対する細胞の反応について議論する.
主な方法:
- テロメアとテロメラーゼに関する既存の研究の文献レビュー.
- テロメア構造と分子機構に関する情報の合成.
- テロメア機能障害に対する細胞反応の分析.
主要な成果:
- テロメア構造の詳細な説明,DNAおよび関連するタンパク質を含む.
- テロメアの長さと機能を調節する重要な分子機構の解明.
- テロメア短縮またはテロメラーゼ抑制によって活性化される細胞経路の説明.
結論:
- テロメアとテロメラーゼは,染色体の完全性と細胞の寿命を維持するために不可欠です.
- 機能不全のテロメアは重要な細胞反応を誘発し,老化と癌に影響を与えます.
- テロメア生物学に関するさらなる研究は,高齢化に関連する疾患や癌に対する治療戦略を提供することができる.
関連する概念動画
02:31Replication in Eukaryotes
Overview
02:41Telomeres 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.
02:37Restarting 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...
02:15Replicative 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...
01:29Replication 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...
Many Proteins Orchestrate Replication at the Origin
Eukaryotic replication follows many of the same...
02:41Telomeres 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.