Abstract
Purpose
To determine whether G6PDH-activity measured by Brilliant Cresyl Blue known as BCB dye, predicts developmental competence within cohorts of ovine oocytes.
Methods
Ovine oocytes were exposed to BCB staining and categorized into two groups: BCB+ (blue cytoplasm, low G6PDH-activity) and BCB- (colorless cytoplasm, high G6PDH-activity). After maturation in vitro, oocytes were subjected to fertilization followed by in vitro embryo culture.
Results
We observed a significant difference in oocyte diameter considering BCB+ and BCB- oocytes. BCB+ and Control groups showed significantly higher maturation rates compared to BCB- group. There were significantly more cleaved embryos in BCB+ and control groups than in BCB- group. Blastocyst rate was significantly higher for BCB+ group compared to control and BCB- groups with control group being significantly higher than BCB- group.
Conclusion
G6PDH-activity is a strong predictive marker of oocyte competence and may be useful in identifying oocytes with a good prognosis for further develop.
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The authors thank the members of their own laboratories for their helpful discussions. We are also indebted to Miss Lida Langroudi for editing the manuscript.
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Capsule Glucose-6-phosphate dehydrogenase activity in ovine oocytes prior to in vitro maturation is associated with oocyte diameter, meiotic competence and developmental capacity to the blastocyst stage in vitro.
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Mohammadi-Sangcheshmeh, A., Soleimani, M., Deldar, H. et al. Prediction of oocyte developmental competence in ovine using glucose-6-phosphate dehydrogenase (G6PDH) activity determined at retrieval time. J Assist Reprod Genet 29, 153–158 (2012). https://doi.org/10.1007/s10815-011-9625-6
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DOI: https://doi.org/10.1007/s10815-011-9625-6