1 Ocak 2020 Dergi makalesi Açık Erişim

Ugur, Muhammet Rasit; Thu Dinh; Hitit, Mustafa; Kaya, Abdullah; Topper, Einko; Didion, Bradley; Memili, Erdogan

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    <subfield code="a">Sperm cryopreservation is an important technique for fertility management, but postthaw viability of sperm differs among breeding bulls. With metabolites being the end products of various metabolic pathways, the contributions of seminal plasma metabolites to sperm cryopreservation are still unknown. These gaps in the knowledge base are concerning because they prevent advances in the fundamental science of cryobiology and improvement of bull fertility. The objective of this study was to test the hypothesis that seminal plasma amino acids are associated with freezability of bull sperm. To accomplish this objective, amino acid concentrations in seminal plasma from seven bulls of good freezability (GF) and six bulls of poor freezability (PF) were quantified using gas chromatography-mass spectrometry (GC-MS). Multivariate and univariate analyses were performed to identify potential freezability biomarkers. Pathways and networks analyses of identified amino acids were performed using bioinformatic tools. By analyzing and interpreting the results we demonstrated that glutamic acid was the most abundant amino acid in bull seminal plasma with average concentration of 3,366 +/- 547.3 nM, which accounts for about 53% of total amino acids. The other most predominant amino acids were alanine, glycine, and aspartic acid with the mean concentrations of 1,053 +/- 187.9, 429.8 +/- 57.94, and 427 +/- 101.3 nM. Pearson's correlation analysis suggested that phenylalanine concentration was significantly associated with post-thaw viability (r = 0.57, P-value = 0.043). Significant correlations were also found among other amino acids. In addition, partial least squares-discriminant analysis (PLS-DA) bi-plot indicated a distinct separation between GF and PF groups. Phenylalanine had the highest VIP score and was more abundant in the GF groups than in the PF groups. Moreover, pathway and network analysis indicated that phenylalanine contributes to oxidoreductase and antioxidant reactions. Although univariate analysis did not yield significant differences in amino acid concentration between the two groups, these findings are significant that they indicate the potentially important roles of amino acids in seminal plasma, thereby building a foundation for the fundamental science of cryobiology and reproductive biotechnology.</subfield>
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    <subfield code="a">Ugur, Muhammet Rasit</subfield>
    <subfield code="u">Mississippi State Univ, Dept Anim &amp; Dairy Sci, Starkville, MS 39759 USA</subfield>
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    <subfield code="a">Amino Acids of Seminal Plasma Associated With Freezability of Bull Sperm</subfield>
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