概括
裂变酵母中的cdc25+基因启动了线粒分裂. 这种基因的表达增加导致细胞分裂从较小的细胞大小开始,将其确定为细胞周期控制中的关键剂量依赖诱导因子.
科学领域:
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
背景情况:
- 分解的启动是一个关键的细胞周期事件.
- 裂变酵母 Schizosaccharomyces pombe (S. pombe) 是研究细胞循环调节的一个模型生物.
- 精确的分子机制控制了线粒分裂的时间是复杂的.
研究的目的:
- 在S. pombe中克隆和描述cdc25+基因.
- 为了研究cdc25+在调节线粒细胞启动中的作用.
- 为了确定参与线粒控制的新元素.
主要方法:
- 用基因克隆技术将cdc25+基因分离出来.
- 进行DNA测序以确定基因的编码潜力.
- 涉及改变基因表达水平的实验进行,以评估功能影响.
主要成果:
- cdc25+基因被成功克隆和测序,预测了6.7万兆瓦的蛋白质.
- 增加cdc25+的表达导致在细胞大小减少时启动线粒分裂.
- 发现cdc25+是一种剂量依赖的线粒细胞启动诱导剂.
- 有证据表明cdc25+可以抵消wee1+的抑制作用.
结论:
- cdc25+ 是一种关键的,剂量依赖的诱导剂,用于启动S. pombe的线粒分裂.
- cdc25+基因产物在细胞分裂时调节细胞大小方面发挥着关键作用.
- cdc25+ 和 wee1+ 独立起作用,作为线粒体进入的关键调节者.
相关概念视频
02:15M-Cdk Drives Transition Into Mitosis
6.2K
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...
6.2K
01:27Molecular Factors Affecting Cell Division
3.8K
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...
3.8K
02:19The Spindle Assembly Checkpoint
3.7K
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...
3.7K
02:17Separation of Sister Chromatids
4.3K
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...
4.3K
01:28The Cell Cycle Control System
5.2K
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...
5.2K
02:11The Cell Cycle Control System
13.8K
The cell cycle is an organized set of events that leads the cell to divide into two daughter cells, each containing chromosomes identical to the parent cell. It is the cell cycle that leads to the formation of an entire organism from a single-cell zygote. Besides, cell division also functions in the renewal or repair of tissues in adult multicellular eukaryotes. For example, in the bone marrow, the stem cells divide to form new blood cells. Although essential for several functions, cell...
13.8K