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Phosphopeptide Analysis of Rodent Epididymal Spermatozoa
Published on: December 30, 2014
Quantitative analysis of sperm mRNA in the pig: relationship with early embryo development and capacitation
Jae Yeon Hwang1, Brendan P Mulligan, Hyung-Min Kim
1Department of Agricultural Biotechnology, Animal Biotechnology Major, and Research Institute for Agriculture and Life Science, Seoul National University, Seoul 151-921, Korea.
Abstract:
Although it is well known that mRNA is present in mammalian spermatozoa, the relevance of mRNA to capacitation and early embryo development in the pig remains unclear. In the present study, we investigated differences in the abundance of selected mRNAs coding for MYC, CYP19, ADAM2, PRM1 and PRM2 in purified porcine spermatozoa depending on embryo cleavage rate and capacitation (n=20 semen samples). Semen samples were used in IVF procedures, with subsequent embryo development classified into one of two groups based on cleavage rate (i.e. high (>75%) and low (<75%) cleavage groups) and mRNA abundance in purified spermatozoa compared between these two groups. In addition, mRNA abundance was compared between capacitated and non-capacitated spermatozoa. Comparison of mRNA levels between porcine spermatozoa revealed that the abundance of MYC, CYP19, ADAM2, PRM1 and PRM2 mRNA was significantly greater in the high cleavage group (n=10 high cleavage group semen samples) than in the low cleavage group (n=10; P<0.05). Significant downregulation of MYC mRNA was observed in capacitated spermatozoa (n=12; P<0.05). The results of the present study suggest that the amount of specific mRNAs could be used for estimating the quality of spermatozoa in the pig.
Insights
Messenger RNA (mRNA) levels in pig sperm correlate with embryo development. Measuring specific mRNAs in sperm may help estimate sperm quality for improved reproductive outcomes.
Area of Science:
- Reproductive Biology
- Spermatozoa Research
- Embryology
Background:
- Messenger RNA (mRNA) is known to exist in mammalian spermatozoa.
- The specific role of sperm mRNA in pig capacitation and early embryo development is not well understood.
- Investigating mRNA abundance in relation to sperm function is crucial for understanding reproductive success.
Purpose of the Study:
- To investigate the abundance of specific mRNAs (MYC, CYP19, ADAM2, PRM1, PRM2) in porcine spermatozoa.
- To determine the relationship between mRNA abundance, embryo cleavage rate, and sperm capacitation in pigs.
- To explore the potential of using sperm mRNA levels as a biomarker for sperm quality.
Main Methods:
- Semen samples from 20 pigs were analyzed.
- Spermatozoa were purified and classified based on embryo cleavage rates (high >75% vs. low <75%) after IVF.
- mRNA abundance was quantified using quantitative PCR and compared between high/low cleavage groups and capacitated/non-capacitated sperm.
Main Results:
- Significantly higher levels of MYC, CYP19, ADAM2, PRM1, and PRM2 mRNA were found in spermatozoa from the high embryo cleavage group compared to the low cleavage group (P<0.05).
- MYC mRNA showed significant downregulation in capacitated spermatozoa compared to non-capacitated spermatozoa (P<0.05).
- These findings indicate a correlation between specific sperm mRNA levels and embryo developmental potential.
Conclusions:
- The abundance of MYC, CYP19, ADAM2, PRM1, and PRM2 mRNA in porcine spermatozoa is associated with embryo cleavage rates.
- MYC mRNA levels decrease during sperm capacitation.
- Measuring the quantity of these specific mRNAs in pig sperm could serve as a valuable tool for assessing sperm quality and predicting reproductive outcomes.
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