Kinetics of the early development of uniparental human haploid embryos.

OBJECTIVE: To describe morphokinetically the early development of human haploid parthenotes and androgenotes and to compare them with euploid embryos. DESIGN: Experimental study of kinetics. SETTING: University-affiliated private fertility center. PATIENT(S): Experimental haploid parthenotes and androgenotes. INTERVENTION(S): Kinetic study of early development (up to eight cells) of 8 parthenotes, 10 androgenotes, and 20 euploid embryos. MAIN OUTCOME MEASURE(S): Timing of the first seven cleavages determined according to embryo origin, then calculation of the duration of the second and third cell cycles (cc2 and cc3) of whole embryos and individual cells. RESULT(S): Parthenotes and androgenotes were experimentally produced by artificial oocyte activation and intracytoplasmic sperm injection of enucleated oocytes, respectively. Uniparental embryos having 6 to 10 cells were assessed for haploidy, their kinetics analyzed, retrospectively compared with euploid embryos. All the first seven cleavages occurred later in parthenotes than in both androgenotes and correctly fertilized embryos. The whole embryos and single cells showed that cc2 was longer in parthenotes than in both androgenotes and correctly fertilized embryos; cc3 was shorter in androgenotes than in both parthenotes and correctly fertilized embryos. The duration of cc2 versus cc3 was longer in correctly fertilized embryos and parthenotes than in androgenotes. CONCLUSION(S): Parthenotes and androgenotes have different kinetics. The former have a longer cc2, and the latter a consistently shorter cc3 in comparison with correctly fertilized embryos.

Morphokinetics as a predictor of self-correction to diploidy in tripronucleated intracytoplasmic sperm injection-derived human embryos.

OBJECTIVE: To describe, in morphokinetic terms, a tripronucleated embryo (TPN) population according to ploidy and to explore the value of such variables for predicting ploidy. DESIGN: Experimental. SETTING: In vitro fertilization laboratory. PATIENT(S): Seventy-nine TPN embryos obtained after intracytoplasmic sperm injection (TPN-ICSI) were cultured in a time-lapse incubator for 6 days. INTERVENTION(S): Ploidy determinations were carried out for 35 TPN-ICSI at the cleavage and/or blastocyst stage. Their morphokinetics were then retrospectively compared. MAIN OUTCOME MEASURE(S): Direct (cleavage time from 2- to 8-cell stages) and indirect (cell cycle duration and blastomere synchrony at cleavage) morphokinetic variables; ploidy determination by FISH; in vitro development to the blastocyst stage. RESULT(S): TPN-ICSI cleaved later than bipronucleated control embryos (BPN). Diploid TPN displayed morphokinetic behavior closer to BPN than triploid TPN regarding almost all of the direct and indirect morphokinetic variables measured. Variable t5 was found to be a predictable variable of ploidy in TPN. CONCLUSION(S): TPN-ICSI are not homogeneous in ploidy, cleavage, or morphokinetic terms. Diploid, but nontriploid, TPN are morphokinetically similar to diploid BPN. The ploidy of TPN can be predicted by variable t5.