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関連する概念動画

Telomeres and Telomerase02:41

Telomeres and Telomerase

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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...
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Translesion DNA Polymerases02:10

Translesion DNA Polymerases

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Translesion (TLS) polymerases rescue stalled DNA polymerases at sites of damaged bases by replacing the replicative polymerase and installing a nucleotide across the damaged site. Doing so, TLS allows additional time for the cell to repair the damage before resuming regular DNA replication.
TLS polymerases are found in all three domains of life - archaea, bacteria, and eukaryotes. Of the different classes of TLS polymerases, members of the Y family are fitted with specialized structures that...
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Restarting Stalled Replication Forks02:37

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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,...
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The Replisome03:01

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DNA replication is carried out by a large complex of proteins that act in a coordinated matter to achieve high-fidelity DNA replication. Together this complex is known as the DNA replication machinery or the replisome.
The synthesis of the leading and lagging strands is a highly coordinated process. To explain this, the “Trombone model” was proposed by Bruce Alberts in 1980. The DNA loop formation starts when a primer is synthesized on the parent lagging strand. The loop grows with...
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Lagging Strand Synthesis01:59

Lagging Strand Synthesis

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During replication, the complementary strands in double-stranded DNA are synthesized at different rates. Replication first begins on the leading strand. Replication starts later, occurs more slowly, and proceeds discontinuously on the lagging strand.
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Direct Restart of a Replication Fork Stalled by a Head-On RNA Polymerase
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CSTポリメラーゼα-プリマゼは第2テロメア末端複製問題を解く

Hiroyuki Takai1, Valentina Aria2, Pamela Borges1

  • 1Laboratory for Cell Biology and Genetics, Rockefeller University, New York, NY, USA.

Nature
|February 28, 2024
PubMed
まとめ
この要約は機械生成です。

テロメア維持には 2つの複製問題があります テロメラーゼはG鎖の縮小を処理し,Ctc1-Stn1-Ten1ポリメラーゼプリマース複合体はDNA複製中にC鎖の問題を解決する.

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Strand-Specific Analysis of Proteins at Replicating DNA Strands by Enrichment and Sequencing of Protein-Associated Nascent DNA Method
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関連する実験動画

Last Updated: Jul 2, 2025

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Strand-Specific Analysis of Proteins at Replicating DNA Strands by Enrichment and Sequencing of Protein-Associated Nascent DNA Method
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Author Spotlight: Advanced Single-Molecule Techniques for Investigating Telomeric Protein-DNA Interactions
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科学分野:

  • 分子生物学
  • 遺伝学
  • 細胞生物学

背景:

  • テロメアは染色体の末端を 退化や融合から守ります
  • テロメア短縮はDNA合成中の末端複製の問題による.
  • テロメラーゼは,テロメアのG豊富な鎖の縮小を抑制する.

研究 の 目的:

  • C豊富なテロメア鎖に影響を与える第2の末端複製問題を特定し,特徴づけること.
  • C-ストランド複製の問題の解決に伴うメカニズムと要因を解明する.
  • テロメア維持におけるテロメラーゼとCST-ポルα-プリマゼの組み合わせの役割を理解する.

主な方法:

  • テロメアDNA基板を用いた in vitro DNA複製試験
  • CST-Polα-プリマースが欠けている細胞におけるテロメア長さとC-ストランドの整合性の分析.
  • 細胞分裂毎のテロメア重複損失の定量的な測定

主要な成果:

  • 遅れた鎖のDNA合成は,テロメアの末端から約26ntで停止し,C鎖のギャップを残します.
  • CST-Polα-プリマゼは,このC-ストランド複製欠陥を解決するためにフィールイン合成を媒介する.
  • CST- Polα- プリマースが欠けている細胞は,前端と後端の両方でC- 鎖の縮小を顕著に表している.

結論:

  • カノニカルDNA複製は,G鎖の喪失とC鎖の不完全な合成という2つの最終的な複製課題を提示する.
  • テロメラーゼはGに富んだ鎖を維持し,CST-Polα-プリマゼはC鎖の維持に不可欠である.
  • 適切なテロメアの長さは,テロメラーゼとCST-ポルα-プリマゼの協調的な作用を必要とします.