概括
携带转位的母亲,一种染色体异常,比父亲更有可能影响后代. 这种在人类中观察到的现象在小鼠中得到了反映,这表明了进一步研究的潜在模型.
科学领域:
- 遗传学 是一个遗传学.
- 生殖生物学 生殖生物学
- 哺乳动物遗传学 哺乳动物遗传学
背景情况:
- 转位三位症是一种存在额外染色体段的情况.
- 在人类中,母体转位载体增加了受影响后代的风险.
- 这种性别特异性风险在其他物种中也被观察到.
研究的目的:
- 调查在人类中观察到的转位三位症的性别特异性风险是否也存在于实验室小鼠中.
- 确定鼠标是否可以作为研究这种现象背后机制的模型.
主要方法:
- 使用异构合的小鼠进行反向转位T(14;15) 6Ca.
- 从女性转位载体与男性转位载体的后代进行比较.
主要成果:
- 对于T(14;15) 6Ca而言异构的雌性小鼠产生了高频率的转位三体性后代.
- 同一个转位异构的雄性小鼠没有产生任何转位三重性后代.
结论:
- 实验室老鼠表现出与人类观察到的类似的性别特异性转位三位症遗传模式.
- 这种小鼠模型非常适合研究为什么母体转移载体对三位症后代构成更高风险的根本原因.
相关概念视频
01:58X-Inactivation
The human X chromosome contains over ten times the number of genes as in the Y chromosome. Since males have only one X chromosome, and females have two, one might expect females to produce twice as many of the proteins, with undesirable results.
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...