概括
DNA的二次结构影响着染色体的组织. 在超卷状等离子体中形成特定的二次结构的DNA序列也对细胞核中的S1核酶敏感,这表明它在染色质结构中起着主导作用.
科学领域:
- 分子生物学分子生物学
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 基因组学就是基因组学.
背景情况:
- 细胞过程可能利用DNA的二次结构来组织染色质.
- DNAase 1 和 S1 核酶的敏感性与促进子和终结子区域有关.
研究的目的:
- 调查DNA二次结构潜能是否决定了染色体的结构敏感性.
- 为了确定塑体中超线圈诱导核酶敏感性是否存在于细胞染色体中.
主要方法:
- 超螺旋pBR322等离子体DNA转移到L细胞中.
- 在细胞核内转染的DNA中分析S1核酶敏感性.
- 在实验室中,用基因组与的β-A-环球蛋白等离子体进行复制.
主要成果:
- 纯的pBR322DNA中的超引发的S1敏感位点在L细胞核中很大程度上保持着.
- 从β-A-环球蛋白等离子体中复制的染色体也表现出S1-敏感部位.
- 构成S1敏感位点的DNA序列可能表现出减少的核酶体结合.
结论:
- 基因序列形成二次结构的固有潜力是染色体组织的重要因素.
- DNA二次结构可以主导影响染色体中核酶敏感位点的形成.
- 形成S1敏感位点的特定DNA序列可能改变了与基因组和核细胞的相互作用.
相关概念视频
00:58DNA Packaging
Overview
00:58DNA Packaging
Overview
02:21Chromatin Packaging
Each human somatic cell contains 6 billion base-pairs of DNA. Each base-pair is 0.34 nm long, which means that each diploid cell contains a staggering 2 meters of DNA. How is such a long DNA strand packed inside a nucleus measuring only 10 - 20 microns in diameter?
The chromatin
In combination with specialized DNA binding protein called Histones, the DNA double helix forms a compact DNA: protein complex called chromatin. The chromatin itself is further compacted into higher-order structures.
The chromatin
In combination with specialized DNA binding protein called Histones, the DNA double helix forms a compact DNA: protein complex called chromatin. The chromatin itself is further compacted into higher-order structures.
02:05Duplication of Chromatin Structure
The process of chromosome duplication during cell division requires genome-wide disruption and re-assembly of chromatin. The chromatin structure must be accurately inherited, reassembled, and maintained in the daughter cells to ensure lineage propagation.
The basic unit of the chromatin is the nucleosome, consisting of DNA wrapped around octameric histone proteins and short stretches of linker DNA separating individual nucleosomes. The histone proteins within the nucleosome have their...
The basic unit of the chromatin is the nucleosome, consisting of DNA wrapped around octameric histone proteins and short stretches of linker DNA separating individual nucleosomes. The histone proteins within the nucleosome have their...
02:21Chromatin Packaging
Each human somatic cell contains 6 billion base-pairs of DNA. Each base-pair is 0.34 nm long, which means that each diploid cell contains a staggering 2 meters of DNA. How is such a long DNA strand packed inside a nucleus measuring only 10 - 20 microns in diameter?
The chromatin
In combination with specialized DNA binding protein called Histones, the DNA double helix forms a compact DNA: protein complex called chromatin. The chromatin itself is further compacted into higher-order structures.
The chromatin
In combination with specialized DNA binding protein called Histones, the DNA double helix forms a compact DNA: protein complex called chromatin. The chromatin itself is further compacted into higher-order structures.
01:32Chromatin Packaging
Each human somatic cell contains 6 billion base pairs of DNA. Each base pair is 0.34 nm long, meaning each diploid cell contains a staggering 2 meters of DNA. This long DNA strand is packed inside a nucleus measuring only 10-20 microns in diameter with the help of specialized DNA-binding proteins called histones. Together they form a compact DNA-protein complex called chromatin. The chromatin is further compacted into higher-order structures. The highest level of compaction is achieved during...