複合的に複製されたクローンDNA断片とコアヒストンから再構成されたクロマチンは,より高い秩序構造の研究のためのモデルシステムである
Cell
|October 1, 1985
まとめ
研究者らは,ニュクレオソームを超えてクロマチンの構造を研究するための新しいモデルシステムを開発しました. このシステムは,並列に繰り返されるDNA断片を使用して,DNAとコアヒストンの高次元の染色体組織を調査します.
科学分野:
- 分子生物学は分子生物学である.
- バイオケミストリー バイオケミストリー
- 遺伝学 遺伝学とは
背景:
- ヌクレオソームを超えたクロマチンの構造を理解することは,遺伝子調節にとって極めて重要です.
- 既存のモデルでは,より高次元のクロマチンの組織が完全に捉えられないかもしれません.
研究 の 目的:
- ヌクレオソームより上のレベルでクロマチンの構造を研究するためのモデルシステムを開発し,特徴づけること.
- タンデムで繰り返されるDNA配列を用いて,より高次元の染色体構造の形成を調査する.
主な方法:
- 繰り返し数値が異なるタンデムで繰り返されるDNA断片 (172-207 bp) の準備.
- 核ヒストンを用いてこれらの断片に核細胞をインビトロ組み立てます.
- 生物物理学的技術を用いた核細胞の位置とクロマチンの構成の分析.
主要な成果:
- 核細胞は,すべてのタンデムで繰り返されるDNA要素に正しく配置されています.
- 核粒子の各リンク数変化の測定は, -1.0.0. の値を示した.
- 核タンパク質の形状における長さおよび繰り返し数に依存する変化を観察した.
結論:
- 開発されたモデルシステムは,より高いレベルのクロマチンの構造の研究を可能にします.
- オーダーされた上位レベルのクロマチンの構造は,DNAとコアヒストンのみで形成されることがあります.
- 遺伝子の調節とDNAの包装に関する影響をさらに研究することで探すことができます.
関連する概念動画
02:33The Nucleosome
DNA in a human cell is almost 2m long and it is packed inside a tiny nucleus that is only a few microns in diameter. The level of compaction of DNA inside the nucleus is astonishing. It is organized into several sequentially higher levels of compaction to fit into such a tiny space. The most compact form of DNA is a chromosome that can be seen under a microscope in a dividing cell.
DNA is wound twice around a protein complex called histone core, that consist of 8 histone proteins. This complex...
DNA is wound twice around a protein complex called histone core, that consist of 8 histone proteins. This complex...
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.
01:19The Nucleosome
Human DNA is almost two meters long. However, it is compressed inside a tiny nucleus measuring only a few microns in diameter. To make this degree of compaction possible, DNA is organized into several sequential levels so that it can fit into such a tiny space. The most compact form of DNA is a chromosome that can be seen under a microscope in a dividing cell.
In a chromosome, DNA is wound twice around a protein complex called a histone octamer core, which consists of 8 histone proteins. This...
In a chromosome, DNA is wound twice around a protein complex called a histone octamer core, which consists of 8 histone proteins. This...
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...