ヒストンH1.1の急速な交換が,生きているヒト細胞のクロマチンに起こります
1Department of Oncology and Cross Cancer Institute, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Canada.
Nature
|December 29, 2000
まとめ
ヒストンH1は,クロマチンの内部で,凝縮された状態と解凍された状態の両方で,細胞サイクルを通して急速に交換します. タンパク質のリン酸化は,このヒストーンH1の動きに大きく影響し,クロマチンの動態における調節作用を示唆する.
科学分野:
- 分子生物学は分子生物学である.
- 細胞生物学 細胞生物学
- 遺伝学 遺伝学とは
背景:
- ユカリオットDNAは,核適合のためにクロマチンの包装を必要とします.
- ヒストンH1は,高階構造に染色質の凝縮を誘導する.
- H1結合は,転写のためのクロマチンの構造を調節する.
研究 の 目的:
- 生体細胞におけるヒストンH1のダイナミクスを調査する.
- ヒストンH1の動きと交換率を in vivo で監視するために.
主な方法:
- 安定的に統合されたH1.1-GFP融合タンパク質をヒト細胞で利用した.
- H1の動きを追跡するために,光漂白後の光回復 (FRAP) を採用しました.
- 細胞サイクル全体で凝縮されたおよび解凍されたクロマチンのH1交換を分析した.
主要な成果:
- ヒストンH1交換は,凝縮された染色体と解凍された染色体の両方で迅速です.
- H1交換は細胞サイクル全体で起こり,繊維と繊維の相互作用を必要としません.
- タンパク質のリン酸化はH1の為替レートを大幅に低下させる.
結論:
- ヒストンH1の交換はin vivoでは急速であり,溶解性中間体を通じて発生する.
- 特定のタンパク質のリン酸化はヒストンH1交換を調節する.
- これは,染色体構造と遺伝子転写の調節に関する洞察を提供します.
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01:01Euchromatin
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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.
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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...
02:38Heterochromatin
The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions that take up more dye are called heterochromatin. Heterochromatin is further classified into two forms – constitutive heterochromatin and facultative heterochromatin.
Constitutive heterochromatin: It is a highly compact region of chromatin that is mostly concentrated in the centromere and telomere. Unlike euchromatin, the amino acid at 9th...
Constitutive heterochromatin: It is a highly compact region of chromatin that is mostly concentrated in the centromere and telomere. Unlike euchromatin, the amino acid at 9th...
02:38Heterochromatin
The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions that take up more dye are called heterochromatin. Heterochromatin is further classified into two forms – constitutive heterochromatin and facultative heterochromatin.
Constitutive heterochromatin: It is a highly compact region of chromatin that is mostly concentrated in the centromere and telomere. Unlike euchromatin, the amino acid at 9th...
Constitutive heterochromatin: It is a highly compact region of chromatin that is mostly concentrated in the centromere and telomere. Unlike euchromatin, the amino acid at 9th...
01:32Chromatin Modification in iPS Cells
Chromatin modification alters gene expression; therefore, scientists can add histone-modifying enzymes, histone variants, and chromatin remodeling complexes to somatic cells to aid reprogramming into pluripotent stem (iPS) cells.
Compact chromatin makes reprogramming difficult. Enzymes, such as histone demethylases and acetyltransferases, are often added during reprogramming to loosen the chromatin, making the DNA more accessible to transcription factors. Molecules that inhibit histone...
Compact chromatin makes reprogramming difficult. Enzymes, such as histone demethylases and acetyltransferases, are often added during reprogramming to loosen the chromatin, making the DNA more accessible to transcription factors. Molecules that inhibit histone...