在母体免疫激活后表现出认知缺陷的后代中,对精神分裂症风险基因甲基化的发育调节
Rebecca M Woods1,2, Harry G Potter3,4, Hager M Kowash5
1Division of Evolution, Infection and Genomics, School of Biological Sciences, Manchester Academic Health Science Centre, Faculty of Biology, Medicine and Health, University of Manchester, Manchester, M13 9PL, UK. rebecca.woods@manchester.ac.uk.
Molecular psychiatry
|August 29, 2025
概括
孕期孕产妇免疫激活会改变胎儿大脑的表观遗传,增加精神分裂症的风险. 这些表观遗传变化在成年时再次出现, 与认知缺陷相吻合, 提供潜在的治疗点.
科学领域:
- 神经科学
- 发育生物学
- 精神病学
背景情况:
- 孕妇在怀孕期间感染与后代神经发育障碍的风险增加有关.
- 表观遗传机制,特别是涉及DNA甲基化的机制,与母体免疫激活 (MIA) 与精神分裂症风险的联系有关.
- 对MIA如何改变表观遗传机制的有限理解阻碍了对认知症状的治疗目标的识别.
研究的目的:
- 研究MIA对发育中的大脑表观遗传机制和甲基化能力的影响.
- 确定暴露于MIA后代的特定表观遗传变化及其与认知障碍的相关性.
- 研究MIA引起的表观遗传变化对神经发育和精神分裂症风险的长期影响.
主要方法:
- 测量S-adenosylmethionine (SAM) 和S-adenosylhomocysteine (SAH) 度以确定SAM/SAH比率,这是甲基化能力的指标.
- 分析了DNA甲基转移酶 (DNMT) 的表达和活性.
- 评估了DNA甲基化 (DNAm) 模式,并确定了MIA暴露后代的皮质中的不同甲基化基因.
主要成果:
- 在胎儿皮层中增加了SAM/SAH比率和DNMT表达和活性.
- 这些甲基化途径的变化在早期发育过程中是暂时的,但在成年后再次出现,与认知缺陷相关.
- 成年后代表现出改变的DNAm模式,与精神分裂症风险和神经发育途径相关的不同甲基基因.
结论:
- 在怀孕期间母亲的免疫激活会导致后代大脑的长期表观遗传变化.
- 这些由MIA引起的表观遗传变化有助于在成年期观察到的认知缺陷,反映了精神分裂症的方面.
- 这项研究确定了MIA,表观遗传失调和神经发育障碍之间的关键联系,突出了潜在的治疗途径.
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