background: multiple factors have been suggested for prediction of pregnancy in intracytoplasmic sperm injection (icsi) cycles such as the number of injected oocytes, fertilization rate, embryo morphology and quality of transferred embryos. predictive value of these factors is important in icsi outcome. objectives: to evaluate the role of embryo morphology for prediction of pregnancy in icsi cy...

Background: Studies of preimplantation stage embryos by classic cytogenetic techniques have limitations, starting with the need for good metaphase stage when only one third of all analyzed embryos may show good quality metaphases. The incidence of chromosome anomalies in embryos produced by in vitro procedures is generally higher than that of embryos formed in vivo. Pressure specifically affect...

introduction: to improve the development of embryo in vitro several attempts have been made, including the application of leukemia inhibitory factor (lif). this factor plays an important role in embryo development and has been shown to enhance in vitro development rate in sheep and mice. there is controversy regarding the effect of lif on the different stages of embryo development. the aim of t...

In this work, we have studied the impact of various stages cryopreservation by vitrification in ethylene glycolsucrose medium on plasma membranes adhesive properties 8-cell murine embryos and their specific electrical conductivity. Embryos were divided into following experimental groups: control, group 1 (incubation medium) 2 (complete cycle cryopreservation). The embryo exposure to did not aff...

background: matrigel (extracellular matrix) can improve the growth of many cell types in vitro. objective: the aim of the present study was to determine the effect of matrigel on the development of 2-4 cells human embryos in culture. material and methods: surplus 2-4 cells human embryos, resulting from icsi, were divided into two groups (control and test). quality of embryos in both groups was ...

BACKGROUND Vitrification has been shown as one of the most effective methods of cryopreservation for mammalian embryos. However, there is no consensus which stage of embryonic development is the most appropriate for vitrification with subsequent maximal development after thawing. This study was carried out to explore and compare the effect(s) of vitrification on mouse 2-cell, 4-cell, 8-cell, mo...

(SCNT) embryos of buffaloes. 2. To study gene expression profile of important developmental genes at different stages of SCNT cloned embryo. 3. To study epigenetic reprogramming during early developments of SCNT embryos Materials and Methods: Expression analysis of developmental genes was done in different (ovarian granulose and cumulus and skin fibroblasts) donor cells; in vitro maturing oocyt...

Background: The aim of this study was evaluation of developmental rate and Bax, Bcl-2 and ErbB4 genes expression following re-vitrification in compact and early blastocysts stages. Materials and Methods: 5-8 cell embryos were collected from female mature mice, 60-62 hours post hCG injection. The embryos were divided to five groups including: fresh, vitrified at 5-8 cells, vitrified at blastocys...

The aim of this study was to optimize electrofusion conditions for generating porcine tetraploid (4n) embryos and produce tetraploid/diploid (4n/2n) chimeric embryos. Different electric field intensities were tested and 2 direct current (DC) pulses of 0.9 kV/cm for 30 μs was selected as the optimum condition for electrofusion of 2-cell embryos to produce 4n embryos. The fusion rate of 2-cell em...