Oxidative Stress, Sperm DNA Fragmentation, or Both? Optimizing Test Selection in Male Infertility Evaluation

Area of Science:

• Reproductive Medicine
• Andrology
• Genetics

Background:

• Oxidative stress (OS) and sperm DNA fragmentation (SDF) are key factors in male infertility.
• Human sperm are vulnerable to oxidative damage due to their lipid-rich membranes and limited DNA repair capabilities.
• Excess reactive oxygen species (ROS) lead to DNA strand breaks and other damage, impacting fertility and pregnancy outcomes.

Purpose of the Study:

• To review the mechanisms by which OS contributes to genomic instability in sperm.
• To summarize laboratory assays for assessing seminal redox status and SDF.
• To highlight guideline-aligned indications for OS and SDF testing and discuss management strategies.

Main Methods:

• Review of literature on oxidative stress, sperm DNA fragmentation, and male infertility.
• Summary of laboratory assays including ROS assays, antioxidant capacity tests, lipid peroxidation biomarkers, and various SDF platforms.
• Analysis of clinical indications and management approaches for OS and SDF.

Main Results:

• OS and SDF are complementary causes of male infertility, affecting fertilization and embryo development.
• Various assays exist to measure OS (e.g., ROS assays, TAC/FRAP) and SDF (e.g., SCSA, TUNEL, Comet assay, SCD).
• Specific clinical scenarios warrant OS and/or SDF testing, including leukocytospermia, lifestyle factors, recurrent pregnancy loss, unexplained infertility, and IVF/ICSI failure.

Conclusions:

• Selective OS and SDF testing, when guided by clinical context, can refine diagnosis and personalize infertility care.
• Management involves addressing underlying causes, lifestyle modifications, antioxidant therapy, and advanced reproductive technologies.
• Future priorities include assay standardization, understanding DNA damage etiology, and clinical trials with live birth as the endpoint.