相关实验视频
Updated: Jul 15, 2026
13:47
Chromatin Immunoprecipitation (ChIP) using Drosophila tissue
Published on: March 23, 2012
概括
研究人员对Drosophila基因进行了皮层蛋白的测序,确定了五种相关基因. 四个功能性基因编码主要的皮膜蛋白质,而一个是非功能性伪基因,提供了对基因家族进化的见解.
科学领域:
- 基因组学就是基因组学.
- 发育生物学 发展生物学
- 分子进化分子进化
背景情况:
- 皮质蛋白对于昆虫外骨的结构和发育至关重要.
- 了解皮膜蛋白生产的遗传基础是昆虫生物学的关键.
研究的目的:
- 测序和分析含有Drosophila皮质蛋白基因的基因组区域.
- 阐明这些基因的结构,组织和进化关系.
主要方法:
- 9kB的Drosophila基因组区域的DNA测序.
- 识别和绘制皮质基因样序列的地图.
- 确定氨基酸序列并与预测序列进行比较.
主要成果:
- 鉴定并绘制了五个皮质基因样序列.
- 四个功能基因编码主要的第三阶段皮质蛋白,其序列与预测相匹配.
- 一个基因被确定为伪基因,可能是由于不平等的交叉.
- 在调节区域和功能基因的编码序列中发现的保存序列.
结论:
- 测序区域代表了一个模型小基因家族,用于研究皮膜蛋白质进化.
- 基因重复和伪基因化是塑造这种基因家族的机制.
- 保存的调节元素表明了协调的基因表达.
相关概念视频
02:26Conservation of Protein Domains Over Different Proteins
Protein domains are small structurally independent units that are part of a single amino acid chain. Although these domains are often structurally independent, they may rely on synergistic effects to perform their functions as part of a larger protein. Protein domains may be conserved within the same organism, as well as across different organisms.
A limited set of protein domains often duplicate and recombine during evolution. These domains can be organized in different combinations to form...
A limited set of protein domains often duplicate and recombine during evolution. These domains can be organized in different combinations to form...
02:32Position-effect Variegation
In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
02:04Polytene 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...
02:32Exon Recombination
The evolution of new genes is critical for speciation. Exon recombination, also known as exon shuffling or domain shuffling, is an important means of new gene formation. It is observed across vertebrates, invertebrates, and in some plants such as potatoes and sunflowers. During exon recombination, exons from the same or different genes recombine and produce new exon-intron combinations, which might evolve into new genes.
Exon shuffling follows “splice frame rules.” Each exon has three reading...
Exon shuffling follows “splice frame rules.” Each exon has three reading...
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...