在早期亨廷顿病中,Sp1和TAFII130的转录活性受到干扰
Anthone W Dunah1, Hyunkyung Jeong, April Griffin
1Department of Neurology, Massachusetts General Hospital, Harvard Medical School, Center for Aging, Genetics and Neurodegeneration, Charlestown, MA 02129, USA.
Science (New York, N.Y.)
|May 4, 2002
概括
亨廷顿病涉及突变的亨廷丁蛋白破坏基因转录. 恢复Sp1和TAFII130功能可以保护神经元并逆转基因抑制,为这种遗传性神经退行性疾病提供早期干预策略.
科学领域:
- 神经科学是一个神经科学.
- 遗传学 是一个遗传学.
- 分子生物学分子生物学
背景情况:
- 亨廷顿病 (HD) 是一种遗传性神经退行性疾病.
- 病原发生与猎蛋白中的多重质胺通道扩张有关.
- 转录失调是HD的一个关键特征.
研究的目的:
- 研究亨廷丁与转录调节剂之间的相互作用.
- 确定Sp1和TAFII130在疾病发病过程中的作用.
- 确定在HD早期干预的潜在治疗点.
主要方法:
- 研究了与Sp1和TAFII130.0.的狩猎蛋白相互作用.
- 使用了来自野生型和疾病转基因小鼠的培养条状细胞.
- 分析了HD患者死后脑组织中Sp1与DNA的结合.
主要成果:
- 亨廷丁与Sp1和TAFII130.0相互作用.
- Sp1和TAFII130的同时表达逆转了HD细胞中多巴胺D2受体基因的转录抑制.
- 突变的亨廷丁抑制了在症状前和受影响的HD大脑中的Sp1DNA结合.
- 恢复功能保护神经元免受亨廷丁诱导的毒性.
结论:
- 亨廷丁蛋白直接干扰Sp1的转录活动.
- Sp1和TAFII130对于减轻突变狩猎的影响至关重要.
- 针对这些分子相互作用可能为亨廷顿病提供早期治疗策略.
相关概念视频
01:21Huntington Disease l: Introduction
Huntington disease or HD is a progressive, fatal neurodegenerative disorder inherited in an autosomal dominant pattern.PathophysiologyIt is caused by expansion of the CAG trinucleotide repeat in the HTT gene on chromosome 4 (4p16.3), producing an abnormal huntingtin protein with an expanded polyglutamine tract. This misfolded protein disrupts cellular function, leading to neuronal death. Normal alleles have ≤26 repeats, 27–35 are intermediate (risk of expansion), 36–39 show reduced penetrance,...
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...