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定位调节者的转基因标标志着肌源性血统的早期 rostrocaudal 规范
U Grieshammer1, D Sassoon, N Rosenthal
1Department of Biochemistry, Boston University School of Medicine, Massachusetts 02118.
Cell
|April 3, 1992
概括
来自肌光链 (MLC) 位点的调控元素驱动小鼠肌肉中的分级基因表达. 定位线索,而不仅仅是肌源性因素,建立了这个早期的发育梯度.
科学领域:
- 发育生物学是发展生物学.
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
背景情况:
- 肌肉特定的调节元素控制肌肉发育中的基因表达.
- 肌光链 (MLC) 1/3位点含有影响肌肉发育的调节元素.
- 了解肌肉中的基因调节对于发育生物学至关重要.
研究的目的:
- 调查MLC 1/3调控元素在驱动基因表达中的作用.
- 确定前后位置线索如何影响肌肉基因表达梯度.
- 阐明在轴肌中建立早期发育基因表达模式的机制.
主要方法:
- 产生具有与MLC调节元素相关的CAT记者基因的转基因小鼠.
- 在成年和胚胎转基因小鼠中分析记者基因 (CAT) 表达模式.
- 检查各种肌肉类型的转录梯度,包括快肌肉,肋间肌肉和脊椎间肌肉.
- 研究转基因表达在分离的体培养物中,以评估发育时间和梯度的保留.
主要成果:
- MLC 调节元件驱动分级的 CAT 记者基因表达在沿前后轴的特定快肌中.
- 表达梯度在早期发育过程中建立,在somite形成和肌原因子激活过程中.
- 在内源的MLC1基因表达中没有观察到这种梯度.
- 梯度是在尾状体的成熟过程中产生,在培养中保留,并在晚期胚胎阶段在肋间和脊椎间肌肉中持续存在.
结论:
- 肌源性因子联合表达是必要的,但不足以调节MLC-CAT转基因表达.
- 胚胎中的位置线索在建立和维持观察到的基因表达梯度方面发挥着关键作用.
- 这项研究强调了遗传和位置信息在肌肉发育中的复杂相互作用.
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