Center for Reproductive Medicine, Shuguang Hospital Affiliated to Shanghai University of Traditional Chinese Medicine, Shanghai, China.
Shenzhen Key Laboratory of Gene Regulation and Systems Biology, Department of Biology, School of Life Sciences, Southern University of Science and Technology, Shenzhen, China.
PLoS Biol. 2022 Jun 30;20(6):e3001682. doi: 10.1371/journal.pbio.3001682. eCollection 2022 Jun.
Around 60% of in vitro fertilized (IVF) human embryos irreversibly arrest before compaction between the 3- to 8-cell stage, posing a significant clinical problem. The mechanisms behind this arrest are unclear. Here, we show that the arrested embryos enter a senescent-like state, marked by cell cycle arrest, the down-regulation of ribosomes and histones and down-regulation of MYC and p53 activity. The arrested embryos can be divided into 3 types. Type I embryos fail to complete the maternal-zygotic transition, and Type II/III embryos have low levels of glycolysis and either high (Type II) or low (Type III) levels of oxidative phosphorylation. Treatment with the SIRT agonist resveratrol or nicotinamide riboside (NR) can partially rescue the arrested phenotype, which is accompanied by changes in metabolic activity. Overall, our data suggests metabolic and epigenetic dysfunctions underlie the arrest of human embryos.
大约 60%的体外受精 (IVF) 人类胚胎在 3 到 8 细胞阶段之间的致密化之前不可逆地停滞,这构成了一个重大的临床问题。这种停滞的背后机制尚不清楚。在这里,我们表明,停滞的胚胎进入类似衰老的状态,其特征是细胞周期停滞、核糖体和组蛋白下调以及 MYC 和 p53 活性下调。这些停滞的胚胎可以分为 3 种类型。I 型胚胎未能完成母-合子过渡,而 II/III 型胚胎的糖酵解水平较低,氧化磷酸化水平要么较高(II 型)要么较低(III 型)。用 SIRT 激动剂白藜芦醇或烟酰胺核糖苷 (NR) 处理可以部分挽救停滞的表型,这伴随着代谢活性的变化。总的来说,我们的数据表明代谢和表观遗传功能障碍是人类胚胎停滞的基础。