Sperm DNA Fragmentation and Assisted Reproductive Technology Outcomes
Summary
Sperm DNA fragmentation refers to breaks or lesions in the genetic material carried by spermatozoa and is increasingly recognised as a critical determinant of male fertility. Standard semen analysis often fails to detect such molecular damage, yet elevated DNA fragmentation correlates with reduced fertilisation rates, impaired embryo development, higher miscarriage risk and lower live birth rates in assisted reproductive technology (ART) cycles. Factors contributing to fragmentation include oxidative stress, apoptosis during spermatogenesis, environmental toxins and infections. Measurement of the DNA fragmentation index (DFI) has become an adjunct in fertility assessment, guiding choices between in vitro fertilisation (IVF) and intracytoplasmic sperm injection (ICSI), informing antioxidant or lifestyle interventions, and refining prognostic models. Emerging evidence supports integration of DFI with conventional parameters into predictive algorithms to optimise ART outcomes and minimise time to pregnancy.
Research from Nature Portfolio
Recent analyses of large clinical cohorts have confirmed that sperm DFI correlates inversely with key semen parameters—motility, concentration and survival rate—and with oxidative stress markers, such as malondialdehyde and total antioxidant capacity. Stratification of infertile men into low, moderate and high DFI groups revealed that those with higher fragmentation exhibit reduced sperm function but comparable fertilisation and pregnancy rates in both IVF and ICSI, indicating that ICSI may partly mitigate the adverse effects of fragmentation. In foundational experimental work using murine models, measurement of DFI in frozen–thawed sperm predicted fertilisation success and live birth potential, demonstrating a linear inverse relationship between DFI and embryo viability after both IVF and ICSI. These studies underscore the value of DFI as a universal biomarker of sperm quality across species and its potential to inform ART strategy.
Sperm DNA Fragmentation and Assisted Reproductive Technology Outcomes publication trend
The graph below shows the total number of articles in sperm dna fragmentation and assisted reproductive technology outcomes across all publications each year (not limited to Nature Index journals).
Technical terms
Sperm DNA Fragmentation Index (DFI): Percentage of spermatozoa exhibiting DNA strand breaks, measured by assays such as TUNEL or SCSA.
Oxidative Stress: Imbalance between reactive oxygen species (ROS) and antioxidants, leading to molecular damage including DNA fragmentation.
In Vitro Fertilisation (IVF): Laboratory procedure in which eggs and sperm are combined to achieve fertilisation outside the body.
Intracytoplasmic Sperm Injection (ICSI): Micromanipulation technique involving direct injection of a single sperm into an oocyte to overcome fertilisation barriers.
Aneuploidy: Presence of an abnormal number of chromosomes in an embryo, often contributing to implantation failure or miscarriage.
References
- Sperm DNA Fragmentation: Unraveling Its Imperative Impact on Male Infertility Based on Recent Evidence. International Journal of Molecular Sciences (2024).
- Machine learning-based clustering to identify the combined effect of the DNA fragmentation index and conventional semen parameters on in vitro fertilization outcomes. Reproductive Biology and Endocrinology (2023).
- Elevated sperm DNA fragmentation is correlated with an increased chromosomal aneuploidy rate of miscarried conceptus in women of advanced age undergoing fresh embryo transfer cycle. Frontiers in Endocrinology (2024).
- Correlation analysis of sperm DNA fragmentation index with semen parameters and the effect of sperm DFI on outcomes of ART. Scientific Reports (2023).
- Multivariate analyses on male factors and construction of a nomogram for predicting low in vitro fertilization rate. Heliyon (2024).
- Mitigating the Effects of Oxidative Sperm DNA Damage. Antioxidants (2020).
- DNA fragmentation index (DFI) as a measure of sperm quality and fertility in mice. Scientific Reports (2020).
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