細胞サイクルレギュレータが分岐する
1Department of Oncological Sciences, Icahn School of Medicine at Mount Sinai, New York, NY, USA.
Science (New York, N.Y.)
|October 14, 2021
まとめ
重要なG1キナーゼは 遺伝子の発現を制御し 細胞を分裂に駆り立てます この発見により 細胞循環の調節と 結合に関する理解が進んでいます
科学分野:
- 細胞生物学
- 分子生物学
- 遺伝学
背景:
- 細胞循環は 細胞分裂と成長の基本的プロセスです
- 細胞周期のコミットメントは,特にG1段階では,決定的なポイントです.
- このコミットメントを駆動する正確な分子メカニズムは完全に解明されていません.
研究 の 目的:
- 細胞サイクルコミットメントの重要なレギュレータを特定する.
- 転写制御におけるG1キナーズの役割を調査する.
- 細胞分裂への不可逆的な移行を 推進する仕組みを理解するためです
主な方法:
- 酵母モデルでの遺伝子スクリーニングを活用した.
- DNAへのキナーゼ結合を分析するために,ChIP配列を解析した.
- 転写変化を評価するためにRNA配列解析を行った.
- フローサイトメトリーを用いた細胞サイクル分析を行った.
主要な成果:
- 特定のG1キナーゼを細胞サイクルへの関与に不可欠であると特定した.
- このキナーゼが遺伝子プロモーターを 直接標的としていることが示されました
- 不可逆的なG1進行にはキナーゼ媒介による転写活性化が必要であることが示された.
- キナーゼ活性化時に特定の遺伝子発現の有意な増加が観察されました.
結論:
- 鍵となるG1キナーゼは,転写を調節することにより,細胞サイクルコミットメントにおいて重要な役割を果たします.
- 細胞が分裂する際の 重要なメカニズムです
- この発見は細胞サイクル制御と潜在的な治療目標に関する新しい洞察を提供します.
関連する概念動画
01:28The Cell Cycle Control System
3.9K
The cell cycle regulation directs how a cell proceeds from one phase to the next and begins mitosis. The cell cycle control system includes intracellular regulatory molecules and external triggers. They provide "stop" or "advance" signals and operate at specific cell cycle stages termed checkpoints to ensure that a particular process is completed before the cell advances to the next phase.
Cyclins and cyclin-dependent kinases (Cdks) are the primary cell cycle regulators and...
Cyclins and cyclin-dependent kinases (Cdks) are the primary cell cycle regulators and...
3.9K
01:27Molecular Factors Affecting Cell Division
3.4K
Several external and internal factors influence the initiation and inhibition of cell division. For instance, the death of nearby cells or the release of human growth hormone (hGH) promotes cell division. In contrast, lack of hGH or crowding of cells can inhibit cell division.
Several proteins function as internal regulators to ensure each cell cycle stage is completed faithfully before proceeding to the next. Regulator molecules may act directly or influence the activity or production of other...
Several proteins function as internal regulators to ensure each cell cycle stage is completed faithfully before proceeding to the next. Regulator molecules may act directly or influence the activity or production of other...
3.4K
02:39Positive Regulator Molecules
5.8K
Mitotic cell division results in daughter cells that exactly resemble the parent cell. However, errors in the DNA replication or distribution of genetic material may lead to genetic mutations that may be passed down to every new cell formed from the resulting abnormal cell. Propagation of such mutant cells is restricted through checkpoint mechanisms present at different stages of the cell cycle. These checkpoints involve regulator molecules that either promote or demote cell cycle events.
5.8K
01:23Negative Regulator Molecules
36.6K
Positive regulators allow a cell to advance through cell cycle checkpoints. Negative regulators have an equally important role as they terminate a cell’s progression through the cell cycle—or pause it—until the cell meets specific criteria.
36.6K
02:36Cells Coordinate Growth and Proliferation
4.7K
Cell size is a significant factor impacting cellular design, function, and fitness. There exists some internal coordination by which cells double their masses before division, thus, achieving homeostasis. Coordination between cell growth and proliferation depends on the checkpoints in between cell cycle phases. Loss of coordination or failure in the checkpoint mechanism can drive the cell to uncontrolled growth and loss of cellular function. Like dividing cells that coordinate cellular growth,...
4.7K
02:38Mitogens and the Cell Cycle
7.1K
Mitogens and their receptors play a crucial role in controlling the progression of the cell cycle. However, the loss of mitogenic control over cell division leads to tumor formation. Therefore, mitogens and mitogen receptors play an important role in cancer research. For instance, the epidermal growth factor (EGF) - a type of mitogen and its transmembrane receptor (EGFR), decides the fate of the cell's proliferation. When EGF binds to EGFR, a member of the ErbB family of tyrosine kinase...
7.1K