関連する実験動画
Updated: Jul 9, 2026
14:40
Expression Analysis of Mammalian Linker-histone Subtypes
Published on: March 19, 2012
転写: ヒストンと調和している
1Laboratory of Molecular Embryology, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland 20892.
Cell
|April 8, 1994
まとめ
ヒストンは,遺伝子を抑制または活性化できる核細胞を形成することによって,真核細胞の転写を調節する. 彼らの正確な役割は,DNAとタンパク質の相互作用と遺伝子特有の調節因子に依存しています.
科学分野:
- 分子生物学は分子生物学である.
- 遺伝学 遺伝学とは
- バイオケミストリー バイオケミストリー
背景:
- ユカリオットのトランスクリプションは,ヒストンタンパク質の調節に依存しています.
- ヒストンとDNAによって形成される核細胞は,結合部位を遮断することによって転写を抑制することができます.
- 特定の調節分子は,これらの抑圧的なヒストン-DNA複合体を破壊することができます.
研究 の 目的:
- ユカリオットの転写調節におけるヒストンの多面的な役割を解明する.
- ヒストン-DNAの相互作用,ヒストンの尾,アクティベーター複合体が遺伝子発現にどのように影響するかを理解する.
- ヒストン媒介による転写制御の基礎となる生化学的メカニズムを定義する.
主な方法:
- トランスクリプションの調節における重要なプレーヤーを特定するための遺伝子分析.
- ヒストン-DNA相互作用と核細胞の位置づけの物理的特徴.
- 規制複合体の構成と機能を定義するための生化学的研究.
主要な成果:
- 遺伝子データは,ヒストン-DNA複合体の破壊が転写を誘発するのに不可欠であることを確認しています.
- すべての遺伝子が核細胞によって抑制されるわけではありませんが,一部は構成活動のために段階的な染色体組成を利用します.
- ヒストン媒介のDNA折り畳みは,制御要素を並べて,遺伝子の活性化を容易にすることができます.
結論:
- ヒストンは,転写機構のインフラに不可欠です.
- 遺伝子調節に対するヒストンの貢献は文脈に依存し,規制要素の分布,転写因子,DNAの折り畳みによって影響を受けます.
- これらの複雑な相互作用を理解することは,遺伝子発現制御の解読の鍵です.
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関連する概念動画
00:58DNA Packaging
Overview
02:10The Nucleosome Core Particle
Nucleosomes are the DNA-histone complex, where the DNA strand is wound around the histone core. The histone core is an octamer containing two copies of H2A, H2B, H3, and H4 histone proteins.
The paradox
Nucleosomes, paradoxically, perform two opposite functions simultaneously. On the one hand, their main responsibility is to protect the delicate DNA strands from physical damage and help achieve a higher compaction ratio. While on the other hand, they must allow polymerase enzymes to access DNA...
The paradox
Nucleosomes, paradoxically, perform two opposite functions simultaneously. On the one hand, their main responsibility is to protect the delicate DNA strands from physical damage and help achieve a higher compaction ratio. While on the other hand, they must allow polymerase enzymes to access DNA...
02:32Histone Modification
The histone proteins have a flexible N-terminal tail extending out from the nucleosome. These histone tails are often subjected to post-translational modifications such as acetylation, methylation, phosphorylation, and ubiquitination. Particular combinations of these modifications form “histone codes” that influence the chromatin folding and tissue-specific gene expression.
Acetylation
The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone deacetylase,...
Acetylation
The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone deacetylase,...
02:25Spreading of Chromatin Modifications
The histone proteins in the nucleosomes are post-translationally modified (PTM) to increase or decrease access to DNA. The commonly observed PTMs are methylation, acetylation, phosphorylation, and ubiquitination of lysine amino acids in the histone H3 tail region. These histone modifications have specific meaning for the cell. Hence, they are called "histone code". The protein complex involved in histone modification is termed as "reader-writer" complex.
Writers
The writer is an enzyme that can...
Writers
The writer is an enzyme that can...
02:32Histone Modification
The histone proteins have a flexible N-terminal tail extending out from the nucleosome. These histone tails are often subjected to post-translational modifications such as acetylation, methylation, phosphorylation, and ubiquitination. Particular combinations of these modifications form “histone codes” that influence the chromatin folding and tissue-specific gene expression.
Acetylation
The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone deacetylase,...
Acetylation
The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone deacetylase,...
01:12The Nucleosome Core Particle
Nucleosomes are the DNA-histone complex, where the DNA strand is wound around the histone core. The histone core is an octamer containing two copies of H2A, H2B, H3, and H4 histone proteins.
Nucleosomes, paradoxically, perform two opposite functions simultaneously. On the one hand, their primary aim is to protect the delicate DNA strands from physical damage and help achieve a higher compaction ratio. On the other hand, they must allow polymerase enzymes to access histone-bound DNA during...
Nucleosomes, paradoxically, perform two opposite functions simultaneously. On the one hand, their primary aim is to protect the delicate DNA strands from physical damage and help achieve a higher compaction ratio. On the other hand, they must allow polymerase enzymes to access histone-bound DNA during...