在Drosophila胚胎中,通过后部形态原体系统对差距基因的空间控制
M J Pankratz1, M Busch, M Hoch
1Max-Planck Institut für Biophysikalische Chemie, Abteilung Molekulare Entwicklungsbiologie, Göttingen, Germany.
概括
德洛索菲拉的差距基因,如,建立了身体模式. Knirps被广泛激活,但在前后被抑制,与前面的模式基因相比,显示出明显的后后形态基因系统相互作用.
科学领域:
- 发育生物学是发展生物学.
- 遗传学 是一个遗传学.
- 分子生物学分子生物学
背景情况:
- 德洛索菲拉的缺口基因对于早期胚胎模式至关重要.
- 它们对母亲的位置信号做出反应,以定义前后轴.
- Knirps 是一个关键的缺口基因,参与后部模式形成.
研究的目的:
- 为了研究差距基因的调节机制.
- 要了解如何在前后轴上差异地表达knirps.
- 为了比较后部形态系统与前部模式系统的相互作用.
主要方法:
- 在野生类型的Drosophila胚胎中分析knirps基因表达模式.
- 调查在Knirps上起作用的镇压机制.
- 与前面模式基因的比较分析,如背和双背.
主要成果:
- 差距基因曲显示了整个野生类型胚胎的激活潜力.
- 克尼尔普斯的表达是从前部和后部区域积极抑制的.
- 这种差异性调节突出了后部模式的独特作用模式.
结论:
- 后部形态系统,以旋转调节为例,与前部系统运作截然不同.
- 不同抑制是建立后部模式形成的关键机制.
- 这些发现为Drosophila胚胎发育提供了分子洞察力.
相关概念视频
Position-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.
The Ratio of X Chromosome to Autosomes
In most organisms, sex is determined by the ratio of X and Y chromosomes. However, in some organisms, such as Drosophila and C.elegans, sex is determined by the ratio of the number of X chromosomes to the number of sets of autosomes. The Y chromosome in Drosophila is active but does not determine sex. It contains genes responsible for the production of sperms in adult flies.
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...
Dosage Compensation
In animals, gender is determined by the number and type of sex chromosome. For example, human females have two X chromosomes, and males have one X and one Y chromosome, whereas C.elegans with one X chromosome is a male, and the one with two X chromosomes is a hermaphrodite.
In addition to sexual development, the X chromosome has genes involved in autosomal functions such as brain development and the immune system. Therefore, males and females with distinct numbers of X chromosomes will have...
In addition to sexual development, the X chromosome has genes involved in autosomal functions such as brain development and the immune system. Therefore, males and females with distinct numbers of X chromosomes will have...


