1201-Two Causes of Human Pre-implantation Embryonic Arrest

Paper Talk · Jun 29, 2026 · 22m

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…