概括
在老鼠中,肝脏特异性基因转录需要特定的DNA序列. 这些序列位于白蛋白基因促进体的-170和-55之间,对于肝细胞转录至关重要,并且可以为其他促进体赋予肝脏特异性活性.
科学领域:
- 分子生物学分子生物学
- 基因规则 基因规则
- 生物化学 生物化学
背景情况:
- 从老鼠肝脏,大脑和脏的核提取物被用来研究基因转录.
- 腺病毒-2 主要晚期促进物作为一般RNA聚合酶II活性的控制物.
研究的目的:
- 识别负责肝脏特异性基因转录的DNA序列.
- 研究特定的白蛋白基因促进区在赋予组织特异性表达中的作用.
主要方法:
- 从老鼠组织中制备转录活性核提取物.
- 在体外转录试验中使用不同的基因促进剂 (腺病毒-2主要晚期,小鼠白蛋白和Amy-1).
- 鼠标白蛋白基因促进区的删除和插入突变 (-170至-55).
主要成果:
- 鼠标白蛋白基因促进剂仅在肝核提取物中表现出显著活性.
- 删除 -170 和 -55 之间的蛋白促进体序列导致肝脏特异性转录减少了 ~100 倍.
- 插入这些白蛋白序列在转录不良的Amy-1促进体上游增强了其在肝脏提取物中的活性.
结论:
- 在小鼠白蛋白基因促进体的-170至-55区域内的特定DNA序列对于肝脏特异性转录至关重要.
- 这些调节序列可以将肝脏特异的转录活性赋予异质促进体.
相关概念视频
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Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...
01:30General Transcription Factors
Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...