Relationship Between Sperm Parameters and Indices of Chromatin Condensation and DNA Fragmentation in Semen

TL;DR

This study shows that sperm DNA damage and poor chromatin packaging are linked to reduced sperm movement and abnormal shapes, suggesting these factors should be included in infertility testing.

Contribution

The study establishes a novel connection between sperm DNA fragmentation, chromatin condensation, and specific sperm abnormalities like macrocephaly.

Findings

High DNA damage or poor chromatin packaging correlates with reduced sperm motility and abnormal forms.

DNA fragmentation and chromatin condensation are significantly associated with motility and macrocephaly (p < 0.0001).

No significant links were found between chromatin condensation or DNA fragmentation and other sperm parameters (p > 0.99).

Abstract

Infertility is a major global health issue, affecting about 15% of couples, with male factors responsible for nearly one third of cases. Current evaluations usually rely on semen analysis, which measures sperm concentration, movement, and shape. While important, these tests often fail to explain why many men remain infertile. This limitation has led researchers to explore deeper aspects of sperm quality, particularly the condition of the genetic material it carries. In this study, we examined two hidden features: whether sperm DNA is damaged and whether it is properly condensed and packaged. We analyzed samples from 80 men and compared these factors with standard sperm characteristics. The results revealed that men with high DNA damage or poor chromatin packaging often had sperm with reduced motility and abnormal forms. This shows that conventional semen tests alone may not fully capture the causes of male infertility. Our findings emphasize the need to integrate DNA integrity and chromatin assessments into standard diagnostic practice. Such approaches would improve diagnostic precision, guide better treatment choices in assisted reproduction, and increase the chances of pregnancy for couples. In the long term, this knowledge will also support continued progress in reproductive medicine.

Infertility is a major health problem affecting about 15% of couples worldwide. Male etiology is found in almost one-third of cases. This study identified the nature of the relationship between sperm DNA fragmentation (SDF), sperm chromatin condensation (SCC) and sperm parameters. In this study, 80 samples were analyzed using two methods: the TUNEL technique to assess sperm DNA quality and aniline blue coloration to determine the level of chromatic condensation of spermatozoa. In addition, to specify the standard sperm parameters, the spermogram and the spermocytogram were analyzed. The main results revealed a significant difference between SDF and motility and, similarly, between SCC, motility, and teratozoospermia macrocephaly types (p < 0.0001, p < 0.0001, respectively), but no differences between SCC, SDF, and the other sperm parameters (p > 0.99).

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