関連する実験動画
Updated: May 24, 2026

10:09
Evaluation of the Spindle Assembly Checkpoint Integrity in Mouse Oocytes
Published on: September 13, 2022
ESCRT-IIIは,CHMP4Cを通じて,オーロラB介的脱離チェックポイントを管理しています
Jeremy G Carlton1, Anna Caballe, Monica Agromayor
1Department of Infectious Diseases, King's College London School of Medicine, London, UK.
まとめ
ESCRT-IIIのサブユニットである充電型多胞体タンパク質4C (CHMP4C) は,細胞分裂のタイミングを調節する. 染色体ブリッジの早期解消とDNA損傷を防ぐために,アブシッション中にAurora Bキナーゼと相互作用します.
科学分野:
- 細胞生物学 細胞生物学
- 分子生物学は分子生物学である.
- 遺伝学 遺伝学とは
背景:
- トランスポート (ESCRT) 機械に必要なエンドソーム分別複合体は,細胞分裂,特に細胞運動と切除に不可欠です.
- 脱離のタイミングを調節する正確なメカニズムを理解することは,ゲノム不安定を防ぐために不可欠です.
研究 の 目的:
- 充電された多胞体体タンパク質4C (CHMP4C) が,細胞動力学的断絶のタイミングを調節する役割を調査する.
- 細胞分裂の最終段階でCHMP4Cが関与する分子相互作用と経路を解明する.
主な方法:
- 免疫光顕微鏡では,サイトキネシス中にCHMP4Cの局所化を追跡します.
- 染色体旅客複合体 (CPC) とのCHMP4Cの相互作用を研究するための生化学分析.
- 変異したCHMP4C機能を持つ細胞におけるDNA損傷と染色体ブリッジ解像度の分析.
主要な成果:
- CHMP4Cは,遅期のサイトキネシス中に空間時分布の差異を示しており,これは,脱離のタイミングにおけるその役割と相関しています.
- CHMP4Cは,オーロラB依存脱離チェックポイント内で機能します.
- CHMP4Cは,細胞間染色体ブリッジの早期解消を防止し,DNA損傷の蓄積を軽減します.
- CHMP4Cは,CPCの成分であるボレアリンと相互作用し,オーロラBのリン酸化を含む規制メカニズムを示唆しています.
結論:
- CHMP4Cは脱離のタイミングの重要なレギュレータとして機能し,適切な細胞分離を保証します.
- CHMP4Cを介してESCRT機構は,中体解像度を脱離チェックポイントとリンクすることによって,遺伝的損傷に対する保護的役割を果たします.
関連する概念動画
The Spindle Assembly Checkpoint
The spindle assembly checkpoint is a molecular surveillance mechanism ensuring the fidelity of chromosome segregation during anaphase. The checkpoint monitors the completion of all the prerequisite steps before chromosome segregation to determine whether the segregation process should proceed or be delayed.
Many proteins function together to control the spindle assembly checkpoint. Mutations affecting these proteins may allow cells to proceed into anaphase prematurely, resulting in the...
Many proteins function together to control the spindle assembly checkpoint. Mutations affecting these proteins may allow cells to proceed into anaphase prematurely, resulting in the...
Separation of Sister Chromatids
At the transition from prophase to metaphase, there is a reduction in cohesion along the chromosomal arms, resulting in the resolution of sister chromatids. However, residual cohesin connections remain to hold the sister chromatids together until the transition from metaphase to anaphase. The residual connection prevents any premature separation of sister chromatids, blocking the risks of aneuploidy within the daughter cells.
At the onset of anaphase, separase, a proteolytic enzyme, is...
At the onset of anaphase, separase, a proteolytic enzyme, is...
Anaphase Promoting Complex
The stepwise destruction of specific proteins is necessary for the progression and completion of the cell cycle. Such proteins are ubiquitinated by ubiquitin ligases and then subsequently destroyed by the proteasome. The SCF (Skp1/Cullin/F-box) and the anaphase-promoting complex (APC) are two important ubiquitin ligases involved in cell cycle progression. While SCF is active throughout the cell cycle, APC gets activated during metaphase to anaphase transition. Cdc20 or Cdh1 binds to APC and...
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...
Pinching-off of Coated Vesicles
Vesicle budding is orchestrated by distinct cytosolic proteins such as adaptor proteins, coat proteins, and GTPases. To initiate vesicle budding, membrane-bending proteins containing crescent-shaped BAR domains bind to the lipid heads in the bilayer and distort the membrane to form a protein-coated vesicle bud. Adaptors proteins such as AP2 for clathrin-coated vesicles can nucleate on the deformed membrane. Finally, coat proteins such as clathrin or COPI and COPII assemble into a coat forming...
M-Cdk Drives Transition Into Mitosis
Checkpoints throughout the cell cycle serve as safeguards and gatekeepers, allowing the cell cycle to progress in favorable conditions and slow or halt it in problematic ones. This regulation is known as the cell cycle control system.
Cyclin-dependent kinases, or Cdks, work in concert with cyclins to control cell cycle transitions. M-Cdk, a complex of Cdk1 bound to M cyclin, is a well-known example of this coordinated control that drives the transition from the G2 to the M phase.
M cyclin...
Cyclin-dependent kinases, or Cdks, work in concert with cyclins to control cell cycle transitions. M-Cdk, a complex of Cdk1 bound to M cyclin, is a well-known example of this coordinated control that drives the transition from the G2 to the M phase.
M cyclin...

