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Background  Oocyte secreted factors (OSFs), including growth differentiation factor 9 (GDF9) and bone morphogenetic protein 15 (BMP15), play an important role in the process of follicular development and oocyte maturation. Since OSFs are expressed in oocytes and cumulus granulosa cells, the aim of the present study was to explore whether the expression levels of  GDF9  and  BMP15  mRNAs in cumulus granulosa cells can be used as molecular markers for predicting oocyte developmental potential.    Methods  Cumulus cells of 2426 cumulus-oocyte complexes were collected from 196 female patients who underwent intracytoplasmic sperm injection (ICSI) and were used for mRNA detection on the egg retrieval day. Pearson correlation analysis was used to analyze the correlation between OSF expression and general physiological parameters. Partial correlation analysis was used to analyze the correlation between OSF expression and oocyte developmental potential. Covariance analysis was used to compare OSF expression among different groups. Receiver operating characteristic curves were used to examine the diagnostic value of  GDF9  and  BMP15  mRNA for predicting pregnancy.    Results  The expression levels of  GDF9  and  BMP15  mRNAs were significantly associated with age, body mass index (BMI), oocyte maturation, normal fertilization, and cleavage rate ( P  < 0.05). The expression levels of  GDF9  and  BMP15  mRNAs in the group with high-quality embryos were significantly higher than those in the group without high-quality embryos ( P  < 0.05). The expression levels of  GDF9  and  BMP15  mRNAs in the pregnancy group were significantly higher than those in the nonpregnancy group ( P  < 0.05). The cut-off value of  GDF9  mRNA for predicting pregnancy was 4.82, with a sensitivity of 82% and a specificity of 64%. The cut-off value of  BMP15  mRNA for predicting pregnancy was 2.60, with a sensitivity of 78% and a specificity of 52%.    Conclusions  The expression levels of  GDF9  and  BMP15  mRNAs were closely associated with oocyte maturation, fertilization, embryo quality, and pregnancy outcome; therefore,  GDF9  and  BMP15  mRNAs in cumulus granulosa cells may be considered as new molecular markers for predicting oocyte developmental potential.

Increased GDF9 and BMP15 mRNA levels in cumulus granulosa cells correlate with oocyte maturation, fertilization, and embryo quality in humans