哺乳類ポリメラーゼ θは,代替 NHEJ を促進し,再結合を抑制する
Pedro A Mateos-Gomez1, Fade Gong2, Nidhi Nair3
1Skirball Institute of Biomolecular Medicine, Department of Cell Biology, NYU School of Medicine, New York, New York 10016, USA.
Nature
|February 3, 2015
まとめ
代替的非同類末端結合 (NHEJ) 経路は,破損したDNAを修復するためにポリメラーゼセータ (Polθ) を使用し,突然変異を引き起こします. Polθの抑制は,DNA修復メカニズムに欠陥があるがんを治療する可能性がある.
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.
- がん研究 がん研究
背景:
- 代替的非同類末端結合 (NHEJ) 経路は,ゲノム不安定性と細胞変異に関与しています.
- この誤りやすい修復メカニズムは,機能不全のテロメアで活性化され,染色体融合につながります.
研究 の 目的:
- 代替的なNHEJの際に非TTAGGG核酸エンスェルションに起因する酵素活性を特定する.
- 代替的なNHEJにおけるポリメラーゼテータ (Polθ) の役割とその治療的可能性を調査する.
主な方法:
- テロメア融合のブレイクポイントでの修復を分析するための次世代シーケンシング.
- 哺乳類の細胞におけるPolθの抑制と,NHEJに対するその影響の評価.
- DNA修復経路を研究するためにPolq欠乏マウスの分析.
- BRCA欠乏細胞におけるPolθ枯渇時の細胞生存を評価する.
主要な成果:
- 機能不全のテロメアにおける代替的なNHEJは,TTAGGG以外の核酸挿入を生成する.
- ポリメラーゼセータ (Polθ) は,代替的なNHEJの重要な要因として特定されています.
- Polθ抑制は,代替 NHEJ と染色体転位を抑制する.
- マウスにおけるPolqの損失は,ホモロジー指向の修復率を増加させる.
- Polθの枯渇はBRCA欠乏と連携し,細胞生存に影響を与える.
結論:
- ポリメラーゼセータは,代替のNHEJ経路における重要な酵素であり,変異性の挿入を駆動する.
- Polθを阻害することは,BRCA変異を持つような,ホモロジー・ディレクテッド・リペアに欠陥があるがんに対する潜在的な治療戦略を提供します.
関連する概念動画
Translesion DNA Polymerases
11.9K
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...
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...
11.9K
Homologous Recombination
66.0K
The basic reaction of homologous recombination (HR) involves two chromatids that contain DNA sequences sharing a significant stretch of identity. One of these sequences uses a strand from another as a template to synthesize DNA in an enzyme-catalyzed reaction. The final product is a novel amalgamation of the two substrates. To ensure an accurate recombination of sequences, HR is restricted to the S and G2 phases of the cell cycle. At these stages, the DNA has been replicated already and the...
66.0K
Homologous Recombination
7.6K
7.6K
Conservative Site-specific Recombination and Phase Variation
7.4K
Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
The recognition sites for Cre recombinase called LoxP...
The recognition sites for Cre recombinase called LoxP...
7.4K
Proofreading
10.0K
Synthesis of new DNA molecules is carried out by the enzyme DNA polymerase, which adds nucleotides on the daughter strand complementary to the template DNA strand. DNA polymerase has a higher affinity to add the correct base and ensures fidelity during DNA replication. Furthermore, it exhibits proofreading activity during replication, using an exonuclease domain that cuts off incorrect nucleotides from the nascent DNA strand.
Errors During Replication are Corrected by the DNA Polymerase...
Errors During Replication are Corrected by the DNA Polymerase...
10.0K
Proofreading
62.7K
Overview
62.7K


