相关实验视频
Updated: Jul 13, 2026
12:19
Analysis of Cell Cycle Position in Mammalian Cells
Published on: January 21, 2012
在 prokaryotes 和 eukaryotes 中的 G1 时期的一个统一模型
1Department of Microbiology, The University of Michigan School of Medicine, Ann Arbor, Michigan 48109, USA.
Nature
|July 5, 1979
概括
细胞分裂循环模型显示,G1阶段不是一个不同的阶段,而是DNA合成准备的一部分. 这个G1期仅仅是因为细胞倍增时间超过S和G2阶段的持续时间.
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:
- 细胞分裂周期是生命的基础,确保遗传物质的准确复制.
- 现有的模型描述了不同的阶段,包括G1,S,G2和M,每个阶段都有特定的功能.
研究的目的:
- 介绍一个统一的模型,解释细胞分裂周期在原核生物和真核生物.
- 挑战G1阶段具有独特功能的传统观点.
主要方法:
- 基于现有的细胞生物学原理的概念建模.
- 分析DNA合成和细胞分裂之间的时间关系.
主要成果:
- G1时期被重新定义为DNA合成的准备阶段,而不是具有独特功能的时期.
- G1周期的存在是由细胞相对于DNA合成和G2持续时间的翻倍时间解释的.
结论:
- 细胞循环的修订模型整合了原生生物和真核生物过程.
- G1阶段是细胞生长动力学的结果,而不是一个独特的功能要求.
相关概念视频
00:54Interphase
The cell cycle occurs over approximately 24 hours (in a typical human cell) and in two distinct stages: interphase, which includes three phases of the cell cycle (G1, S, and G2), and mitosis (M). During interphase, which takes up about 95 percent of the duration of the eukaryotic cell cycle, cells grow and replicate their DNA in preparation for mitosis.
00:54Interphase
The cell cycle occurs over approximately 24 hours (in a typical human cell) and in two distinct stages: interphase, which includes three phases of the cell cycle (G1, S, and G2), and mitosis (M). During interphase, which takes up about 95 percent of the duration of the eukaryotic cell cycle, cells grow and replicate their DNA in preparation for mitosis.
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...
00:56Interphase
The cell cycle occurs over approximately 24 hours (in a typical human cell) and in two distinct stages: interphase, which includes three phases of the cell cycle (G1, S, and G2), and mitosis (M). During interphase, which takes up about 95 percent of the duration of the eukaryotic cell cycle, cells grow and replicate their DNA in preparation for mitosis.
Phases of Interphase
Following each period of mitosis and cytokinesis, eukaryotic cells enter interphase, during which they grow and replicate...
Phases of Interphase
Following each period of mitosis and cytokinesis, eukaryotic cells enter interphase, during which they grow and replicate...
00:56Interphase
The cell cycle occurs over approximately 24 hours (in a typical human cell) and in two distinct stages: interphase, which includes three phases of the cell cycle (G1, S, and G2), and mitosis (M). During interphase, which takes up about 95 percent of the duration of the eukaryotic cell cycle, cells grow and replicate their DNA in preparation for mitosis.
Phases of Interphase
Following each period of mitosis and cytokinesis, eukaryotic cells enter interphase, during which they grow and replicate...
Phases of Interphase
Following each period of mitosis and cytokinesis, eukaryotic cells enter interphase, during which they grow and replicate...
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...