The Relationship Between Sperm Midpiece Details and DNA Fragmentation in Human Sperm.

Area of Science:

• Reproductive Medicine
• Spermatozoa Morphology
• Andrology

Background:

• Sperm DNA fragmentation (SDF) negatively impacts male fertility and reproductive success.
• Mitochondria, located in the sperm midpiece, are a primary source of free radicals causing SDF.
• Understanding the relationship between sperm morphometry and SDF is crucial for assessing sperm quality.

Purpose of the Study:

• To investigate the correlation between sperm midpiece dimensions (length, width, area) and sperm DNA fragmentation.
• To determine the ideal sperm midpiece area associated with lower DNA fragmentation index (DFI).
• To establish a DFI cutoff value for assessing sperm DNA integrity.

Main Methods:

• Prospective collection of demographic, semen analysis, and DFI data from 239 infertile men.
• Morphometric analysis of 50 spermatozoa per patient (total 11,950) to measure midpiece dimensions.
• Statistical analysis to evaluate correlations between midpiece measurements and DFI, and calculate DFI cutoff.

Main Results:

• A DFI cutoff value of 19.50 was determined.
• Sperm midpiece length and width showed statistically significant but low correlations with DFI.
• Sperm midpiece area demonstrated a higher correlation with DFI compared to length and width.
• The ideal midpiece area associated with lower DFI was found to be between 2.31 and 3.13 µm².

Conclusions:

• Sperm midpiece area is a significant predictor of sperm DNA fragmentation, more so than midpiece length or width.
• The findings suggest that midpiece area measurements could be a valuable addition to routine semen analysis for fertility assessment.
• Further research exploring the impact of midpiece area on reproductive outcomes is warranted.