细胞生长调节与非对称分裂和细胞周期调节在Caulobacter crescentus中的结合
Skye Glenn1,2,3, Alessio Fragasso1,2, Wei-Hsiang Lin2,3
1Department of Biology, Stanford University, Stanford, CA 94305.
概括
细菌的子细胞可以以不同的速度生长,即使具有相同的基因. 这项研究表明,Caulobacter crescentus中的不对称分裂导致由于细胞周期阶段和SpotT活性而导致不同的生长.
科学领域:
- 微生物学 微生物学
- 细胞生物学 细胞生物学
- 细菌生理学 细菌生理学
背景情况:
- 细菌生长速度通常被认为是子细胞之间的均.
- 大多数研究都侧重于对称分裂,忽视了α-蛋白质细菌中常见的不对称分裂.
- 不对称的分裂产生了具有不同大小和发展命运的子细胞.
研究的目的:
- 为了研究不对称地分裂的细菌中功能上不同的子细胞是否表现出不同的生长速度.
- 确定导致增长率差异的潜在机制.
- 探索G1阶段和SpotT活动在调节细胞生长中的作用.
主要方法:
- 使用了模型α-蛋白质细菌Caulobacter新月.
- 在营养充足的条件下,群体和茎状子细胞的比较生长率.
- 分析了细胞周期阶段 (G1阶段) 和SpotT活动对生长的影响.
主要成果:
- 功能上不同的蜂群和茎细胞显示出不同的平均生长率,尽管具有相同的基因组和环境.
- 在DNA复制之前的G1阶段,增长放缓有助于这种差异.
- 由于更长的G1阶段,Swarmer细胞经历了更严重的生长放缓.
- 产生 (p) pGpp 警报激素的 SpoT 活动加剧了与 G1 相关的生长减缓,并延长了 G1 阶段的持续时间.
结论:
- 在C. crescentus.中,细胞生长,G1阶段持续时间和不对称的细胞分裂之间存在联系.
- 这种合允许在不同的子细胞类型之间对生长速度进行差异调节.
- 可以利用SpotT活动来改变种群的G1特异性特征的丰富性来适应环境.
相关概念视频
02:11The Cell Cycle Control System
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...
02:36Cells Coordinate Growth and Proliferation
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,...
02:11The Cell Cycle Control System
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...
02:36Cells Coordinate Growth and Proliferation
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,...
01:28The Cell Cycle Control System
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 function at the cell...
Cyclins and cyclin-dependent kinases (Cdks) are the primary cell cycle regulators and function at the cell...
01:27Molecular Factors Affecting Cell Division
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...