Abstract
Background
Sperm DNA damage is associated with male infertility, lower pregnancy rates and pregnancy loss.
Objective
The primary aim of our study was to evaluate the prevalence of sperm DNA damage in younger and older men with normozoospermia.
Design, Setting and Participants
We obtained semen from 277 consecutive non-azoospermic men presenting for sperm DNA testing.
Outcome Measurements and Statistical Analysis
The main outcome measures included sperm % DNA fragmentation index (%DFI, using sperm chromatin structure assay), sperm concentration, motility and morphology, and, paternal age.
Results and Limitations
Sperm % DFI was positively correlated with paternal age (r = 0.20, P < 0.001) and inversely correlated % progressive motility (r = −0.16, P = 0.01). Sperm %DFI was significantly higher in older (≥40 years) compared to younger (<40 years) normozoospermic men (17 ± 13 vs. 12 ± 8, respectively P = 0.008), whereas, sperm concentration, progressive motility and morphology were not significantly different in these two groups. Moreover, the prevalence of high levels of sperm DNA damage (>30 % DFI) was significantly higher in older compared to younger normozoospermic men (17 % vs. 3 %, respectively, P < 0.001).
Conclusion
The data indicate that a conventional semen analysis can often fail to detect a defect in spermatogenesis (high %DFI) in older men and suggest that infertile couples with advanced paternal age, including those with normal semen parameters, should consider sperm DNA testing as part of the couple evaluation.
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Capsule In a retrospective study of 277 consecutive non-azoospermic men presenting for sperm DNA testing, we have found that the prevalence of high levels of sperm DNA damage was significantly higher in older (≥40 years) compared to younger (<40 years) normozoospermic men.
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Das, M., Al-Hathal, N., San-Gabriel, M. et al. High prevalence of isolated sperm DNA damage in infertile men with advanced paternal age. J Assist Reprod Genet 30, 843–848 (2013). https://doi.org/10.1007/s10815-013-0015-0
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DOI: https://doi.org/10.1007/s10815-013-0015-0