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Strong Correlation Between Double-Strand DNA Breaks and Total Sperm DNA Fragmentation in the Human Ejaculate.
Jaime Gosálvez1, Stephen D Johnston2, Ahinoa Prado3
1Department of Biology, Universidad Autónoma de Madrid, Madrid, Spain.
Archives of Medical Research
|November 20, 2024
Summary
Double-strand DNA breaks (DSBs) in sperm correlate with whole sperm DNA fragmentation (W-SDF). However, the relationship differs significantly between low and high W-SDF groups, indicating varied underlying damage mechanisms.
Area of Science:
- Reproductive biology
- Spermatozoa DNA integrity
- Male infertility research
Background:
- Sperm DNA damage, including double- and single-strand breaks (DSBs and SSBs), arises from degenerative processes.
- This DNA fragmentation is often linked to underlying male reproductive pathologies.
Purpose of the Study:
- To investigate if DSBs in human ejaculate consistently predict whole sperm DNA fragmentation (W-SDF).
- To analyze the relationship between DSBs and W-SDF across different levels of sperm DNA damage.
Main Methods:
- Correlation analysis between spermatozoa with W-SDF and those with DSBs.
- Two patient cohorts were defined: low W-SDF (≤30%) and high W-SDF (≥30%).
Main Results:
- A positive association was found between increasing W-SDF and DSB incidence.
- A linear relationship (DSBs = 0.799 * W-SDF) was observed when combining cohorts.
- Separate analysis revealed differing relationships: linear in low SDF (0.559) and exponential in high SDF (0.602).
- Variability between DSBs and W-SDF was significantly higher in the high SDF group.
Conclusions:
- DSBs in sperm are correlated with W-SDF in semen.
- The biological mechanisms driving DSBs manifest differently in ejaculates with higher DNA damage levels.
