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The effect of two cryopreservation methods on human sperm DNA damage
Taixiu Liu1, Jianfang Gao1, Niya Zhou2
1School of Public Health, University of Ningxia Medical, Yinchuan, 750004, People's Republic of China; Institute of Toxicology, College of Preventive Medicine, University of Third Military Medical, Chongqing, 400038, People's Republic of China.
Cryobiology
|April 30, 2016
Summary
Sperm DNA damage from cryopreservation is significant. Storing neat semen at -80°C causes less sperm DNA damage than liquid nitrogen storage (-196°C) with cryoprotectants. Avoid repeated freezing and thawing to minimize damage.
Area of Science:
- Reproductive Biology
- Cryobiology
- Genetics
Background:
- Sperm cryopreservation methods vary, potentially impacting sperm DNA integrity.
- Understanding the effects of different storage temperatures on sperm DNA is crucial for assisted reproductive technologies.
Purpose of the Study:
- To compare sperm DNA damage resulting from storage at -80°C versus -196°C.
- To evaluate the influence of cryoprotectants and freeze-thaw cycles on sperm DNA integrity.
- To provide data for selecting optimal sperm cryopreservation protocols.
Main Methods:
- Semen samples from 28 college students were analyzed.
- Samples underwent two freeze-thaw cycles.
- Sperm DNA damage was assessed using single cell gel electrophoresis (SCGE) and sperm chromatin structure assay (SCSA).
Main Results:
- Both SCGE and SCSA confirmed cryopreservation induces significant sperm DNA damage.
- Storage at -196°C with cryoprotectants resulted in more severe DNA damage than storage at -80°C (SCSA).
- Increased freeze-thaw cycles correlated with higher sperm DNA damage.
Conclusions:
- Storage of neat semen at -80°C causes less sperm DNA damage compared to storage at -196°C with cryoprotectants.
- Minimizing freeze-thaw cycles is essential to prevent additional sperm DNA damage.
- The findings offer guidance for optimizing sperm banking and cryopreservation strategies.
