1201-Two Causes of Human Pre-implantation Embryonic Arrest

This research identifies two primary biological failures responsible for the high rate of developmental arrest in human embryos before they can implant. Using advanced long-term live imaging, scientists discovered that the second mitotic division is the most unstable stage, where centriole overduplication leads to multipolar spindles and severe chromosomal errors. These early mistakes cause blastomere death and prevent embryos from reaching the 8-cell stage. Conversely, embryos that fail later at the morula stage are typically affected by endoplasmic reticulum stress, which disrupts the essential proteins needed for cellular polarity and structural integrity. By pinpointing these distinct mechanisms, the study provides a roadmap for improving assisted reproductive technologies and clinical outcomes. This comprehensive 5-day analysis highlights the unique vulnerabilities of primate development compared to standard animal models like mice.References:Li Z, Leng L, Zhai J, et al. Two distinct causes contribute to the low efficiency of human pre-implantation development[J]. Cell, 2026.前往小宇宙评论区与主播互动