活细胞中单个分子水平的中心教条
1Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, USA.
Nature
|July 22, 2011
概括
基因表达是一种随机的,单分子的过程,导致细胞对细胞的差异. 实时显微镜揭示了转录和翻译中的这些随机事件如何影响细胞行为和表型.
科学领域:
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
- 生物物理学的生物物理.
背景情况:
- 基因表达,即将遗传信息转化为功能产品的过程,起源于单个DNA分子.
- 细胞中的单分子过程,包括基因表达和调节,本质上是随机的,在时间上偶尔发生.
- 这种随机性导致传递 RNA (mRNA) 和蛋白质水平在基因相同细胞群体中的显著异质性.
研究的目的:
- 在单分子水平上研究基因表达的随机性质.
- 在单个细胞内实时量化转录和翻译等动态分子过程.
- 为了证明单分子随机事件对细胞表型的影响.
主要方法:
- 使用先进的单细胞光显微镜技术.
- 获得了单分子灵敏度,用于量化转录和蛋白质组.
- 监控动态分子过程,包括实时的转录因子结合,转录和翻译.
主要成果:
- 成功量化了单分子分辨率的mRNA和蛋白质拷贝数.
- 提供基因表达动态的实时定量描述,坚持分子生物学的核心教条.
- 证明单个随机分子事件可以成为细胞表型的决定因素.
结论:
- 基因表达基本上是在单个分子水平上的随机过程.
- 先进的显微镜能够实时对单细胞内的分子动态进行定量分析.
- 基因表达中的随机性在产生细胞异质性和确定细胞命运方面发挥着至关重要的作用.
相关概念视频
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01:25The Central Dogma
Overview
01:25The Central Dogma
Overview
01:20The Central Dogma
The central dogma explains the flow of genetic information from DNA nucleotides to the amino acid sequence of proteins.
RNA is the Missing Link Between DNA and Proteins
In the early 1900s, scientists discovered that DNA stores all the information needed for cellular functions and that proteins perform most of these functions. However, the mechanisms of converting genetic information into functional proteins remained unknown for many years. Initially, it was believed that a single gene is...
RNA is the Missing Link Between DNA and Proteins
In the early 1900s, scientists discovered that DNA stores all the information needed for cellular functions and that proteins perform most of these functions. However, the mechanisms of converting genetic information into functional proteins remained unknown for many years. Initially, it was believed that a single gene is...
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02:11Proteins: From Genes to Degradation
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