概括
皮克里酸和甲固定方法保持了在聚烯染色体中的[(3) H]乙酸盐结合. 与[(3) H]尿氨酸不同的是,[(3) H]乙酸盐分布分散,这表明气泡形成不涉及基因素乙化.
科学领域:
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
- 染色体研究 染色体研究
背景情况:
- 聚染色体是研究基因调节的关键模型.
- 希斯乙化是一种已知的表观遗传修饰,影响基因表达.
- 了解膨胀形成的分子机制对于基因调节研究至关重要.
研究的目的:
- 为了研究聚烯染色体中的[(3) H]乙酸盐的结合模式.
- 为了确定不同的固定方法对[(3) H]乙酸盐保留的影响.
- 阐明 histone 乙化在聚烯染色体膨胀形成中的作用.
主要方法:
- 纳入放射性标记的乙酸 [(3) H]乙酸和尿素 [(3) H]尿素.
- 应用各种固定技术:皮克酸,甲,乙醇和酸.
- 聚烯染色体制剂的无线电分析.
主要成果:
- 用皮克酸或甲进行固定,成功地保留了合并的[(3) H]乙酸盐.
- 乙醇和酸的固定导致了内置的[(3) H]乙酸盐的损失.
- [(3) H]乙酸盐在聚烯染色体中表现出扩散的结合,与 [(3) H]尿素在气泡中的优先结合不同.
- 在现有或新诱导的气泡中没有观察到 [(3) H] 乙酸盐的优先结合.
结论:
- 固化方法的选择显著影响了合并的[(3) H]乙酸盐的保留.
- [3H]乙酸盐的扩散纳入模式表明,它没有直接参与泡形成的特定分子事件.
- 研究结果表明,聚烯染色体中的膨胀形成可能不涉及基因组的乙化.
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相关概念视频
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...
