ProAKAP4: A Promising Biomarker Linking Post-Thaw Sperm Quality to Fertility in Dogs?

Area of Science:

• Veterinary Reproduction
• Sperm Biology
• Biomarker Discovery

Background:

• ProAKAP4 is a sperm-specific protein crucial for flagellar organization and motility.
• It's a potential biomarker for semen quality and fertility in mammals.
• Its role in canine reproduction requires further investigation.

Purpose of the Study:

• To investigate the association between proAKAP4 concentrations and sperm kinematic parameters in dogs.
• To evaluate the correlation between proAKAP4 levels and fertility outcomes following artificial insemination in bitches.

Main Methods:

• Collected and cryopreserved 26 canine ejaculates from eight dogs.
• Assessed sperm motility and velocity using Computer-Assisted Sperm Analysis (CASA).
• Quantified proAKAP4 concentrations with a species-specific ELISA assay and performed artificial inseminations.

Main Results:

• Post-thaw semen samples exhibited higher measurable proAKAP4 concentrations compared to fresh samples.
• No significant correlations were found between proAKAP4 levels and total motility or progressive motility.
• ProAKAP4 concentrations did not correlate significantly with sperm velocity parameters (VAP, VSL, VCL).

Conclusions:

• ProAKAP4 levels in dogs do not appear to directly correlate with sperm kinematic parameters or fertility outcomes.
• Findings suggest proAKAP4 might reflect aspects of sperm structural integrity rather than functional parameters.
• Further research is needed to fully elucidate the role of proAKAP4 in canine reproductive success.