Global decrease in the expression of signalling pathways' genes in murine uterus during preimplantation pregnancy.

Early preimplantation embryo-maternal communication is crucial for the establishment and development of pregnancy. Though the involvement of several candidate genes and proteins in this complex event has been described, the hierarchy of molecular networks governing this communication remains unknown. The primary objective of this study was to determine whether the presence of embryos in the uterine lumen stimulated or inhibited gene expression in the uterine tissue on day 3.