Background: Morphologic features are the most common criteria for selecting human embryo to be transferred to the receptive uterine cavity. However, such characteristics are not valid for embryos in cellular arrest. The aim of this study was to quantify the expression profile of hsa-miR-21-3p, -24-1-5p, -191-5p, and -372-5p on day 3 of culture media from in vitro fertilization (IVF) embryo that were implanted or failed to be implanted in patients (n=25 pregnant and 25, non-pregnant patients).
Methods: Fifty patients were accepted in the Department of Reproductive Biology of a Hospital in México City, based on the Institutional inclusion criteria for in vitro fertilization. On day 3 of development, embryos were transferred to women, and the culture medium was collected from implanted embryos (n=25, pregnant patients) and non-implanted embryos (n=25, non-pregnant). In the culture medium, RNA was isolated using TRIzol reagent. MiRNA expression was detected through RT-PCR with specific primers. Expression bands were quantified using an optic density.
Results: The expression profiles were compared between pregnant and non-pregnant patients revealing a significant 5.2-fold greater expression of hsa-miR-191-5p in the former group (p ≤0.001) and a significantly higher expression of hsa-miR-24-1-5p (p =0.043) in the latter. No significant difference was found between the two groups in regard hsa-miR-21-3p or hsa-miR-372-5p (p =0.41).
Conclusions: According to the results, has-miR-191-5p could possibly be a possible biomarker of adequate human embryo development. This miRNA modulated IGF2BP-1 and IGF2R, which are associated with the implantation window. On the other hand, hsa-miR-24-1-5p may be related to a poor prognosis of human embryo development.