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スピンドルに独立する割れ目の位置付け経路は,スピンドルに独立する割れ目の位置付け経路です
Clemens Cabernard1, Kenneth E Prehoda, Chris Q Doe
1Howard Hughes Medical Institute, University of Oregon, Eugene, Oregon 97403, USA.
Nature
|September 3, 2010
まとめ
新しいスパインドル独立メカニズムは,ドロソフィラのニューロブラストの割れ目を位置づけている. A Pinsの皮質極性経路は,毛穴タンパク質を基礎皮質に誘導し,細胞分裂部位の決定に影響を与えます.
科学分野:
- 細胞生物学 細胞生物学
- 発達生物学 発達生物学とは
- 遺伝学 遺伝学とは
背景:
- ミトス・スパインドルは,メタゾア細胞分裂の際に,クラビージ・フォロー・サイトの主な決定因子と考えられています.
- クリーバージュフォローの位置付けのための代替メカニズムの存在は,ほとんど未開発のままです.
研究 の 目的:
- ドロソフィラのニューロブラストにおける裂け目の局所化を制御する潜在的なスパインドル独立メカニズムを調査する.
- 細胞分裂部位の決定.細胞分裂部位の決定.細胞分裂部位の決定.細胞分裂部位の決定.細胞分裂部位の決定.
主な方法:
- ドロソフィラのニューロブラストをモデルシステムとして利用した.
- 基礎皮質における主要なフォロータンパク質 (パヴァロッティ,アニリン,ミオシン) の局所化を調査した.
- スピンドルの回転と移転がフォロー形成に及ぼす影響を調べました.
- ピンズ皮質の極性経路の関与を分析した.
主要な成果:
- ドロソフィラのニューロブラストにおける割れ目の位置づけのためのスパインドル独立のメカニズムを特定した.
- Pinsの皮質極性経路タンパク質が,神経芽細胞の基礎皮質に早期および後期フォローのタンパク質を局所することを実証した.
- この経路は,ミトスのスパインドルなしにしても,基礎的に移動したを誘導できることを示しました.
- スピンドルの操作で2つの異なる (極性誘発型とスパインドル誘発型) の形成を観察した.
結論:
- Pinsの皮質の極性経路によって媒介される,スパインドルに独立するメカニズムは,ドロソフィラのニューロブラストの裂け目の位置づけに貢献します.
- このメカニズムは,哺乳類の神経原始体を含む,他の高度に分極化された細胞の細胞分裂に決定的な役割を果たす可能性があります.
- この発見は,細胞分裂部位を決定するミトスフィンドルの独占的な役割に異議を唱えている.
関連する概念動画
02:13Determining the Plane of Cell Division
Positioning the cell division plane is a critical step during development and cell differentiation, particularly during mitosis when the plane is essential for determining the size of the two daughter cells. The cell division plane is perpendicular to the plane of chromosome segregation, but different types of organisms have different cell division mechanisms to suit their morphology and function.
Animal cells
In animal cells, the cleavage furrow forms along the plane of cell division starting...
Animal cells
In animal cells, the cleavage furrow forms along the plane of cell division starting...
02:13Determining the Plane of Cell Division
Positioning the cell division plane is a critical step during development and cell differentiation, particularly during mitosis when the plane is essential for determining the size of the two daughter cells. The cell division plane is perpendicular to the plane of chromosome segregation, but different types of organisms have different cell division mechanisms to suit their morphology and function.
Animal cells
In animal cells, the cleavage furrow forms along the plane of cell division starting...
Animal cells
In animal cells, the cleavage furrow forms along the plane of cell division starting...
02:19The 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...
02:19The 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...
02:50Spindle Assembly
Spindle assembly occurs through three, often coexisting, pathways – the centrosome-mediated pathway, the chromatin-mediated pathway, and the microtubule-mediated pathway – collectively contributing to form a robust spindle apparatus.
In most cells, centrosomes are the primary microtubule nucleation centers. In the centrosome-mediated pathway, the G2-prophase transition triggers centrosome maturation and increased microtubule nucleation. Progressive nucleation results in a microtubule array...
In most cells, centrosomes are the primary microtubule nucleation centers. In the centrosome-mediated pathway, the G2-prophase transition triggers centrosome maturation and increased microtubule nucleation. Progressive nucleation results in a microtubule array...
01:33Cleavage and Blastulation
After a large-single-celled zygote is produced via fertilization, the process of cleavage occurs while zygotes travel through the uterine tube. Cleavage is a mitotic cell division that does not result in growth. With each round of successive cell division, daughter cells get increasingly smaller.