增强剂聚合可通过非编码变异激活致病基因
bioRxiv : the preprint server for biology
|July 16, 2025
概括
非编码DNA增强剂中的平衡色素使基因对异常激活敏感,导致遗传疾病. 这项研究揭示了增强剂毒性作为一种关键机制,它是功能获取突变和疾病易感性的基础.
科学领域:
- 遗传学 遗传学是一种遗传学.
- 发展生物学 发展生物学
- 分子生物学分子生物学
背景情况:
- 增强剂中的单核酸变异,即调节转录的非编码DNA元素,可以通过异常基因激活引起遗传疾病.
- 通过功能增强器突变驱动子宫外基因激活的精确机制尚未完全理解.
研究的目的:
- 调查增强剂中毒在通过功能增益突变调解异常基因激活中的作用.
- 阐明增强剂变体导致遗传疾病的机制,如多节节.
主要方法:
- 在小鼠中使用Sonic hedgehog (Shh) 的ZRS增强器作为模型系统.
- 分析了与增强剂活性相关的染色质可访问性和基因素修饰.
- 研究了致残的先驱转录因子结合对增强器功能和肢体发育的影响.
- 检查了其他与疾病相关的增强剂以及预测/验证的增强剂活性 in silico 和 in vivo.
主要成果:
- 证明ZRS中的平衡色素使Shh对前肢芽的异常激活敏感,从而导致多肢动.
- 显示,通过利用这种平衡状态,超过20种独立的ZRS变体会导致Shh表达错误和四肢形.
- 禁用与ZRS结合的先驱转录因子可以防止异常激活,并挽救四肢形.
- 确定增强剂中毒是疾病相关增强剂的共同特征,并预测自闭症相关变体的新增增强剂活动.
结论:
- 空间增强器中毒产生对非编码突变的易感性,为遗传性疾病提供了机制性的解释.
- 增强剂中毒是功能获取非编码变体的致病性的一个关键因素.
- 这种机制为各种遗传疾病的病因提供了洞察力,包括四肢形和自闭症.
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