Hoxb-1的细分表达是由一个高度保守的自调节循环控制的,该循环依赖于exd/pbx
1Medical Research Council, National Institute for Medical Research, London, England.
Cell
|June 30, 1995
概括
脊椎动物后脑发育中的Hoxb-1基因调节涉及一个积极的反循环. 这一过程需要与外牙/pbx蛋白进行合作结合,以获得正确的4号染色体表达.
科学领域:
- 发展生物学 发展生物学
- 遗传学 遗传学 是一个
- 分子生物学分子生物学
背景情况:
- 霍克斯基因对胚胎发育至关重要,控制身体平面的形成.
- 特定的Hox基因,如Hoxb-1,对于后脑细分至关重要.
- 了解霍克斯基因表达的调节机制是破译发育过程的关键.
研究的目的:
- 识别和描述控制后脑中Hoxb-1表达的调节元件.
- 阐明了Hoxb-1自我调节的基础分子机制.
- 为了研究Hoxb-1介导基因表达中的辅因子的作用.
主要方法:
- 在脊椎动物中对Hoxb-1调节区域进行比较序列分析.
- 使用转基因小鼠和Drosophila胚胎进行功能分析.
- 在体外结合测试以研究蛋白质-DNA相互作用.
主要成果:
- 确定了三种对4 (r4) 染色体表达至关重要的保存序列动图.
- 证实了Hoxb-1自我调节,这取决于唇部 (实验室) 家庭成员.
- Hoxb-1与调节元件结合需要辅助因子,包括pbx1,它是外牙 (exd) 的同类物质.
- 在实验室中证明了Hoxb-1与exd/pbx蛋白的合作结合.
- 在Drosophila中r4增强剂的活性取决于实验室和外界.
结论:
- 在r4中Hoxb-1表达涉及直接的自我调节.
- 这种自我调节是由Hoxb-1和exd/pbx蛋白之间的合作相互作用调节的.
- 这些发现提供了体内和体外证据,证明在后脑发育过程中存在一种新的调节机制.
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