母亲维生素C缺乏和遗传风险因素通过DNA甲基化失调导致先天性缺陷
bioRxiv : the preprint server for biology
|June 12, 2025
概括
孕产妇维生素C (VitC) 缺乏会导致发育迟缓和出生缺陷的小鼠无法合成VitC. 在怀孕期间减少VitC摄入量可能导致DNA高甲基化和神经管缺陷,影响胎儿表观基因组发育.
科学领域:
- 发展生物学 发展生物学
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 营养科学 营养科学
背景情况:
- 母亲的营养显著影响胎儿表观基因组编程.
- 维生素C (VitC) 对于通过十-十一转位 (TET) 酶去甲基化DNA至关重要.
- 维生素C缺乏在胚胎发育中的作用尚未得到充分研究.
研究的目的:
- 研究母体维生素C缺乏对缺乏维生素C合成 (Gulo-/-) 的小鼠胚胎发育的影响.
- 确定维生素C水平,DNA甲基化和胃流动期间发育异常之间的关系.
主要方法:
- 使用L-gulonolactone氧化酶 (Gulo) 缺乏的小鼠,不能合成VitC,模仿人类的饮食要求.
- 在不同的VitC饮食条件下,对Gulo-/-胚胎的胚胎发育,DNA甲基化模式和TET1活性进行了评估.
- 与发育迟缓和形的发生率和严重程度相关的VitC水平.
主要成果:
- 在Gulo-/-小鼠中,母体VitC缺乏导致胃化过程中显著的发育延迟和形.
- 胚胎神经组织中的DNA高甲基化增加,VitC水平降低和病理严重程度降低.
- 这些表观遗传变化与TET1功能受损有关,特别是在敏感的小鼠菌株中.
- 即使是适度的VitC减少也会导致神经管缺陷.
结论:
- 孕产妇VitC缺乏是导致胚胎发育障碍的关键因素,包括神经管缺陷.
- 怀孕期间补充VitC可以通过保持适当的DNA脱甲基和胎儿表观基因组完整性来预防出生缺陷.
- 确保适当的母体VitC状态对于优化胎儿发育和长期健康结果至关重要.
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