ArticleClinical and experimental reproductive medicine2026
Impact of third cleavage timing on blastulation and miRNA-429 expression in cryopreserved mouse embryos.
Article in Clinical and experimental reproductive medicine, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
objectiveThe aims of this study were to assess embryonic development using a time-lapse monitoring system based on cleavage timing and the use of vitrification and to investigate the correlation between miRNA-429 expression and embryonic development in both fresh and vitrified-thawed embryos.
methodsMouse embryos at the 1-cell stage were collected and randomly divided into fresh and vitrified-thawed groups. The embryos were monitored and further subdivided into early and delayed cleavage based on the timing of the third cleavage event at 55 hours after human chorionic gonadotropin injection. miRNA-429 extracted from spent media or embryos cultured in vitro was analyzed by quantitative reverse transcription-polymerase chain reaction.
resultsEarly cleavage was associated with a significantly higher blastulation rate, regardless of cryopreservation status. Notably, among vitrified-thawed embryos, outgrowth was greater in those exhibiting early cleavage compared to those with delayed cleavage. Furthermore, miRNA-429 expression was elevated in embryos exhibiting delayed cleavage, but only within the cryopreserved group.
conclusionBased on these findings, we suggest that the timing of the third cleavage event may be more critical than the vitrification process itself, and evaluating miRNA-429 expression could serve as an alternative non-invasive selection tool for vitrified surplus embryos.
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