相关实验视频
Updated: Jun 11, 2026
13:47
Chromatin Immunoprecipitation (ChIP) using Drosophila tissue
Published on: March 23, 2012
德洛索菲拉Fab-7染色体元素在线分裂和半分裂过程中传递表观遗传遗传
Cell
|May 30, 1998
概括
虫中的Fab-7元素作为可切换的染色体元素,记住并传递表观遗传状态. 它可以在表观遗传上被沉默或激活,这种记忆可以在几代人之间继承.
科学领域:
- 发展生物学 发展生物学
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 染色体生物学 染色体生物学
背景情况:
- 多组 (PcG) 和三组 (trxG) 蛋白质保持基因表达模式.
- 这些蛋白质对于调节发育重要基因,包括同源性基因至关重要.
研究的目的:
- 研究Fab-7DNA元素在 bithorax复合体中的作用.
- 确定Fab-7元素是否可以在活性和抑制的染色质状态之间切换,并继承这种记忆.
主要方法:
- 使用了转基因Drosophila线.
- 研究了Polycomb蛋白和GAGA因子在Fab-7元素中的相互作用.
- 使用GAL4驱动的记者基因 (lacZ和迷你白) 评估基因沉默和激活.
主要成果:
- 该Fab-7元素诱导侧面的GAL4驱动的记者基因的沉默.
- 在胚胎发生过程中短暂的GAL4脉冲释放PcG-依赖的沉默.
- 这种激活状态是 mitotically 遗传的,并通过雌性半转移传播,独立于 GAL4.
结论:
- 在Fab-7元素的功能作为一个可切换的染色体元素.
- 它传达了表观遗传决定的活性和抑制的染色质状态的记忆.
- 这种表观遗传记忆通过发育和繁殖稳定地继承.
相关概念视频
01:39Chromosomal Theory of Inheritance
In 1866, Gregor Mendel published the results of his pea plant breeding experiments, providing evidence for predictable patterns in the inheritance of physical characteristics. The significance of his findings was not immediately recognized. In fact, the existence of genes was unknown at the time. Mendel referred to hereditary units as “factors.”
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
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03:17Inheritance of Chromatin Structures
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02:45The Ratio of X Chromosome to Autosomes
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Normal male Drosophila has a ratio of one X chromosome to two sets of autosomes. In contrast, normal female Drosophila...
Normal male Drosophila has a ratio of one X chromosome to two sets of autosomes. In contrast, normal female Drosophila...
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...
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