由于遗传的基因素甲基化,子宫外转录可能会干扰分化神经元的持续功能
Juan D Rodriguez1, Monica N Reeves1, Sindy R Chavez1
1Department of Cell Biology, Emory University School of Medicine, Atlanta, GA 30322.
概括
基因组修饰酶的突变会通过在神经元中异位表达生殖系基因引起神经发育缺陷. 这种不适当的转录会扰乱正常行为,甚至在完整的神经元中,突出了神经功能障碍的新机制.
科学领域:
- 神经科学是一个神经科学.
- 遗传学 是一个遗传学.
- 发展生物学 发展生物学
背景情况:
- 基因组胺修饰酶在基因调节中起着至关重要的作用.
- 了解这些酶的突变如何导致神经发育缺陷至关重要.
- 线虫Caenorhabditis elegans提供了一个模型系统,具有不变的血统和特征良好的神经系统.
研究的目的:
- 研究基因组修饰酶突变对神经发育和行为的影响.
- 探索子宫外基因表达在体质组织中的作用.
- 为了确定终端分化神经元的缺陷是否有助于行为缺陷.
主要方法:
- 使用了一种双重突变的Caenorhabditis elegans菌株,在spr-5 (H3K4me1/2脱甲基酶) 和met-2 (H3K9甲基转移酶) 中发生了突变.
- 评估行为缺陷,特别是化疗.
- 分析了胚胎血统,神经元发育和基因表达模式.
- 通过控制特定组织中的基因表达进行了基因救援实验.
主要成果:
- 这种spr-5;met-2双突变体表现出严重的化学反应缺陷.
- 这种缺陷与体质组织中生殖系基因的子宫外表达有关.
- 尽管有行为缺陷,胚胎发育和神经元数量在很大程度上正常.
- 通过专门抑制神经元中的异卵巢生殖系基因表达来实现化学毒素的救援.
结论:
- 神经元中生殖系基因的持续不适当的转录会损害正常的行为.
- 这些发现表明,终端分化细胞内的基因表达中断,而不是发育变化,可能导致行为缺陷.
- 这项研究提供了关于将基因组修饰,基因表达和神经功能联系在一起的机制的见解.
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