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Phosphopeptide Analysis of Rodent Epididymal Spermatozoa
Published on: December 30, 2014
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Quantitative phosphoproteomics explain cryopreservation-induced reductions in ram sperm motility
Shengqin Zang1, Xiaorui Yang2, Jiangfeng Ye1
1Key Laboratory of Livestock and Poultry Multi-omics, Ministry of Agriculture and Rural Affairs, College of Animal Science and Technology (Institute of Animal Genetics and Breeding), Sichuan Agricultural University, Chengdu 611130, PR China.
Journal of Proteomics
|March 4, 2024
Summary
Sperm cryopreservation damages ram sperm motility due to altered protein phosphorylation. This study identified specific protein phosphorylation changes linked to cryo-injury, offering insights into sperm quality and cryoprotectant development.
Area of Science:
- Reproductive Biology
- Proteomics
- Cryobiology
Background:
- Sperm cryopreservation is crucial for livestock breeding but often reduces sperm motility.
- Protein phosphorylation is a key regulator of sperm function and may be affected by cryopreservation.
Purpose of the Study:
- To systematically compare fresh and frozen-thawed ram sperm using quantitative phosphoproteomics.
- To identify specific protein phosphorylation changes responsible for cryo-injury and reduced motility.
Main Methods:
- Collected ejaculates from Dorper rams and froze them using liquid nitrogen.
- Employed TMT (Tandem Mass Tag) quantitative phosphoproteomics to analyze protein phosphorylation.
- Identified and quantified thousands of phosphorylated proteins, peptides, and sites.
Main Results:
- Identified 915 proteins, 3382 peptides, and 6875 phosphorylation sites, with many proteins showing multiple modifications.
- Found significant up-regulation (732 peptides) and down-regulation (909 peptides) of phosphorylation in frozen-thawed sperm.
- Observed down-regulation of the conserved [RxxS] motif and identified sperm-specific proteins (e.g., AKAP3/4) as potential quality biomarkers.
Conclusions:
- Abnormal protein phosphorylation is a primary cause of reduced sperm motility after cryopreservation.
- Differentially phosphorylated proteins are involved in energy production and sperm structure, explaining cryo-injury mechanisms.
- Identified protein markers provide a basis for improving ram sperm cryoprotectants and assessing frozen sperm quality.
