まとめ
ピクリック酸とホルムアルデヒドの固定法では,ポリテネ染色体内の[(3) H]アセタート組み込みが保存されます. [3H]アセタートは,[3H]ウリジンとは異なり,拡散分布があり,ヒストンのアセチル化が関与しないことを示唆しています.
科学分野:
- 細胞生物学 細胞生物学
- 分子生物学は分子生物学である.
- 染色体研究について
背景:
- ポリテン染色体は,遺伝子調節の研究の重要なモデルである.
- ヒストンアセチル化は,遺伝子発現に影響を与える既知の表遺伝子変異である.
- パフ形成の分子メカニズムを理解することは,遺伝子調節研究にとって極めて重要です.
研究 の 目的:
- ポリテン染色体における[(3) H]アセタートの組み込みパターンを調査する.
- 異なる固定方法が[(3) H]アセテート保持に与える影響を測定する.
- ポリテン染色体パフ形成におけるヒストンアセチル化の役割を明らかにする.
主な方法:
- 放射性標識されたアセテート [(3) H]アセテートとウリジン [(3) H]ウリジンの組み込み.
- さまざまな固定技術の適用:ピクリック酸,ホルムアルデヒド,エタノール,エセティック酸.
- ポリテネ染色体製剤のautoradiographic分析. ポリテネ染色体製剤のautoradiographic分析. ポリテネ染色体製剤のautoradiographic分析. ポリテネ染色体製剤のautoradiographic分析. ポリテネ染色体製剤のautoradiographic分析. ポリテネ染色体製剤のautoradiographic分析. ポリテネ染色体製剤のautoradiographic分析. ポリテネ染色体製剤のautoradiographic分析. ポリテネ染色体製剤のautoradiographic分析.
主要な成果:
- ピクリック酸またはホルムアルデヒドによる固定により,組み込まれている [(3) H] アセテートが成功して保持されます.
- エタノールとエステル酸の固定により,組み込まれた[(3) H]アセテートが失われました.
- [(3) H]アセタートはポリテンの染色体への拡散した組み込みを示し, [(3) H]ウリジンのパフへの好ましい組み込みとは異なり.
- 既存のまたは新規に誘発されたパフに[(3) H]アセタートの好ましい組み込みは観察されなかった.
結論:
- 固定方法の選択は,組み込まれている[(3) H]アセタートの保持に大きく影響します.
- [(3) H]アセタートの拡散した組み込みパターンは,それがパフ形成の特定の分子イベントに直接関与していないことを示唆しています.
- 研究結果は,ポリテン染色体におけるパフ形成にはヒストンのアセチル化が関与しない可能性が高いことを示しています.
さらに関連する動画
09:43Purification of H3 and H4 Histone Proteins and the Quantification of Acetylated Histone Marks in Cells and Brain Tissue
Published on: November 30, 2018
07:26Site Specific Lysine Acetylation of Histones for Nucleosome Reconstitution using Genetic Code Expansion in Escherichia coli
Published on: December 26, 2020
関連する概念動画
Histone 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,...
Polytene Chromosomes
Polytene chromosomes are giant interphase chromosomes with several DNA strands placed side by side. They were discovered in the year 1881 by Balbiani in salivary glands, intestine, muscles, malpighian tubules, and hypoderm of larvae Chironomus plumosus. Hence, these are also called "Salivary gland chromosomes." These are found in insects of the order Diptera and Collembola; in certain organs of mammals; and synergids, antipodes of flowering plants. Polytene chromosomes are also regularly...
Euchromatin
The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions take up more dye, appearing darker, while the less-compact areas take up less dye and appear lighter. Based on the compaction level, chromatins are classified into two primary forms – euchromatin and heterochromatin.
Euchromatin is the less dense region of the chromatin and stains lighter. Euchromatin contains histone H3 extensively...
Euchromatin is the less dense region of the chromatin and stains lighter. Euchromatin contains histone H3 extensively...
Heterochromatin
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...
Histone 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,...
Polytene Chromosomes
Polytene chromosomes are giant interphase chromosomes with several DNA strands placed side by side. They were discovered in the year 1881 by Balbiani in salivary glands, intestine, muscles, malpighian tubules, and hypoderm of larvae Chironomus plumosus. Hence, these are also called "Salivary gland chromosomes." These are found in insects of the order Diptera and Collembola; in certain organs of mammals; and synergids, antipodes of flowering plants. Polytene chromosomes are also regularly...
