相关实验视频
Updated: Aug 8, 2026
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Generation of Stable Transgenic C. elegans Using Microinjection
Published on: August 15, 2008
来自X染色体的微注射DNA影响了Caenorhabditis elegans的性别确定
W K McCoubrey1, K D Nordstrom, P M Meneely
1Division of Basic Sciences, Fred Hutchinson Cancer Research Center, Seattle, WA 98104.
Science (New York, N.Y.)
|November 25, 1988
概括
研究人员在X染色体上确定了特定的DNA序列,这些序列决定了Caenorhabditis elegans (C. elegans) 的性别. 在基因中发现的这些短元素,在这种线虫中起到男性或女性发育的关键信号作用.
科学领域:
- 发育生物学 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:
- 在Caenorhabditis elegans (C. elegans) 中的性别决定是由X染色体对自体的比率 (X/A比率) 调节的.
- 以前的研究表明X染色体上的女性化元素,但它们的分子性质仍然未被定义.
研究的目的:
- 在C. elegans中分子定义负责性别决定的女性化元素.
- 识别影响体质和生殖系性别决定的特定DNA序列.
主要方法:
- 将克隆的X染色体DNA序列微注入染色体上男性的C. elegans胚胎.
- 测试各种DNA片段,包括actin,髓酸重链和髓酸轻链基因对性别确定的影响.
- 雌性化区域的定位在X链接的动因基因的特定内子内.
主要成果:
- 三个不同的X染色体克隆,包括部分动因和髓基因,成功使染色体男性C. elegans变得女性化.
- 女性化效应影响了体质和生殖线发育.
- 一个关键的女性化区域被精确地映射到X链接的actin基因的内部的一个131个基对段中.
结论:
- 与X链基因相关的简短,离散的DNA元素作为C. elegans的性别决定信号.
- 这些元素在调节向女性化发展路径方面发挥着基本作用.
相关概念视频
02:45The 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...
02:50Dosage 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...