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Nature:母体维生素C调节DNA去甲基化和雌性胎儿生殖细胞发育

2019-09-15 纪艳青 生物探索

通常来说,发育被认为是基因组固有调控的,不过目前这种观点已经被刷新。证据表明,发育很容易受到外界环境调节的影响,并可能产生长期后果,当然这其中也包括哺乳动物。所以呢,由于这种表观遗传效应的潜在可能性,研究者们对具有这种潜能的生殖细胞一直青睐有加。

通常来说,发育被认为是基因组固有调控的,不过目前这种观点已经被刷新。证据表明,发育很容易受到外界环境调节的影响,并可能产生长期后果,当然这其中也包括哺乳动物。所以呢,由于这种表观遗传效应的潜在可能性,研究者们对具有这种潜能的生殖细胞一直青睐有加。

哺乳动物的生殖细胞经历了广泛的DNA去甲基化,这在很大程度上是通过在连续的细胞分裂过程中被动的甲基化稀释发生的,同时伴随着TET酶的DNA主动去甲基化。TET活性已被证明受营养物质和代谢物的调节,比如维生素C。

那维生素C是否是DNA去甲基化所必须的呢?带着这样的问题,美国加利福尼亚大学的研究人员对小鼠模型展开研究。研究发现,母体维生素C对于DNA去甲基化和雌性胎儿生殖细胞的发育是必需的。

母体维生素C缺乏并不影响胚胎发育,但会导致生殖细胞数量减少、减数分裂延迟和成年后代的繁殖力下降。缺乏维生素C的胚胎的生殖细胞转录组与携带Tet1基因无效突变的胚胎的转录组非常相似。维生素C缺乏会导致异常的DNA甲基化,包括减数分裂和转座因子的关键调控因子的不完全去甲基化。


图片来源:pixabay

这些发现表明,在妊娠期间缺乏维生素C部分地再现了TET1的丢失,并提供了一个潜在的代间机制来调整生育力以适应环境条件。

原始出处:Stephanie P. DiTroia, Michelle Percharde, Marie-Justine Guerquin, et al. Maternal vitamin C regulates reprogramming of DNA methylation and germline development. Nature. 04 September 2019

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    2020-07-07 liye789132251
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    2019-09-16 neurowu
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    2019-09-15 schorr

    对发育特别有作用

    0

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