title: Prediction of blastocyst development and implantation potential in utero based on the third cleavage and compaction times in mouse pre-implantation embryos.
abstract: Cytokinesis and cell division during pre-implantation embryonic development occur as an orchestrated spatiotemporal program. Cleavage, compaction, and blastulation in pre-implantation embryos are essential for successful implantation and pregnancy. Their alteration is associated with chromosomal imbalance and loss of developmental competence. In this study, we evaluated the time of cleavage and compaction as predictors for in vitro pre- and peri-implantation development and in utero implantation potential by time-lapse monitoring. Mouse 2-cell embryos were collected on 1.5 days post coitum (dpc) and were individually cultured to the outgrowth (OG) stage (7.5 dpc). Developmental stages were classified as 3-cell, 4-cell, 8-cell, morula, blastocyst, and OG. Cut-off times for successful blastocyst development were determined by receiver operating characteristic curve analysis. When cut-off times were set as 9 h for the third cleavage from the 2- to 4-cell stage, and 40 h for compaction from the 2-cell to morula stage, blastocyst and OG development rates, respectively, were significantly higher (P < 0.0001). Embryos were grouped according to the above cut-off time and transferred to the contralateral uterine horn on 3.5 dpc. Implantation rates in utero on 5.5 dpc were significantly higher in early third cleaved (≤ 9 h from 2- to 4-cell) and early compacted embryos (≤ 40 h from 2-cell to morula) than those in delayed embryos (P < 0.05). Therefore, the time of the third cleavage from 2- to the 4-cell stage and compaction from 2-cell to morula stage may be a useful morphokinetic parameter for predicting developmental potential, including successful implantation and pregnancy in human in vitro fertilization-embryo transfer programs.
authors.affiliation: Department of Senior Healthcare, BK21 Plus Program, Graduated School, Eulji University, Gyeonggi-do 461-713, Korea.
authors.forename: Jihyun
authors.initials: J
authors.lastname: Kim
authors.affiliation: Department of Obstetrics and Gynecology, Seoul National University College of Medicine, Seoul 03080, Korea.
authors.forename: Seok Hyun
authors.initials: SH
authors.lastname: Kim
authors.affiliation: Department of Senior Healthcare, BK21 Plus Program, Graduated School, Eulji University, Gyeonggi-do 461-713, Korea.|Department of Biomedical Laboratory Science, Graduate School of Health Science, Eulji University, Gyeonggi-do 461-713, Korea.|Eulji Medi-Bio Research Institute (EMBRI), Eulji University, Gyeonggi-do 461-713, Korea.
authors.forename: Jin Hyun
authors.initials: JH
authors.lastname: Jun
mesh_terms: D000818:Animals; D001755:Blastocyst / Q000502:physiology*; D046149:Embryo Culture Techniques; D010064:Embryo Implantation / Q000502:physiology*; D047108:Embryonic Development / Q000502:physiology*; D005260:Female; D051379:Mice; D011247:Pregnancy; D018873:Pregnancy Rate; D059008:Time-Lapse Imaging
keywords: Cleavage; Compaction; Cut-off time; Implantation potential; Time-lapse monitoring