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12 January 2021 Differences in the proteome of stallion spermatozoa explain stallion-to-stallion variability in sperm quality post-thaw
Gemma Gaitskell-Phillips, Francisco E. Martín-Cano, José M. Ortiz-Rodríguez, Antonio Silva-Rodríguez, Maria C. Gil, Cristina Ortega-Ferrusola, Fernando J. Peña
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Abstract

The identification of stallions and or ejaculates that will provide commercially acceptable quality post-thaw before cryopreservation is of great interest, avoiding wasting time and resources freezing ejaculates that will not achieve sufficient quality to be marketed. Our hypothesis was that after bioinformatic analysis, the study of the stallion sperm proteome can provide discriminant variables able to predict the post-thaw quality of the ejaculate. At least three ejaculates from 10 different stallions were frozen following a split sample design. Half of the ejaculate was analyzed as a fresh aliquot and the other half was frozen and then analyzed as a frozen-thawed aliquot. Computer-assisted sperm analysis and flow cytometry were used to analyze sperm quality. Detailed proteomic analysis was performed on fresh and frozen and thawed aliquots, and bioinformatic analysis was used to identify discriminant variables in fresh samples able to predict the outcome of cryopreservation. Those with a fold change > 3, a P = 8.2e-04, and a q = 0.074 (equivalent to False discovery rate (FDR)) were selected, and the following proteins were identified in fresh samples as discriminant variables of good motility post-thaw: F6YTG8, K9K273, A0A3Q2I7V9, F7CE45, F6YU15, and F6SKR3. Other discriminant variables were also identified as predictors of good mitochondrial membrane potential and viability post-thaw. We concluded that proteomic approaches are a powerful tool to improve current sperm biotechnologies.

Graphical Abstract

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© The Author(s) 2021. Published by Oxford University Press on behalf of Society for the Study of Reproduction. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com
Gemma Gaitskell-Phillips, Francisco E. Martín-Cano, José M. Ortiz-Rodríguez, Antonio Silva-Rodríguez, Maria C. Gil, Cristina Ortega-Ferrusola, and Fernando J. Peña "Differences in the proteome of stallion spermatozoa explain stallion-to-stallion variability in sperm quality post-thaw," Biology of Reproduction 104(5), 1097-1113, (12 January 2021). https://doi.org/10.1093/biolre/ioab003
Received: 3 September 2020; Accepted: 5 January 2021; Published: 12 January 2021
KEYWORDS
Artificial insemination
CASA
cryopreservation
flow cytometry
horse
proteins
spermatozoa
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