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There is an increasing awareness of the potential role of genetic and environmental factors in idiopathic male infertility. However,
there is little compelling evidence to date to suggest that the risk of idiopathic male infertility among the general population is
influenced by exposure to certain chemicals. Thus the first objective of the present study is to assess the occurrence and distribution
of PAHs in mussels of Alex Coast, to identify the origin of PAHs in the Alex Coast, Secondary, to investigate the possible association
between exposure to PAHs and male idiopathic infertility through; estimation of urinary metabolites of PAHs, malonaldehyde
(MDA), GSH, GST, testosterone, FSH, prolactin, Semen analysis and sperm chromatin dispersion test (Halo sperm). The present
results of the study revealed that there were high concentration of many PAHs detected in the tissues of two species of mussels
collected from Alex Coast which may supposed to be at big risk for human health. Also, the present results revealed that there was
a high level of urinary 1-hydroxy pyrene, 1-hydroxy naphthalene, 2-hydroxy naphthalene in the urine of detected infertile group.
In the current study, a high significant increase in the level of MDA in the sera of detected idiopathic infertile group was observed
with a significant decrease in glutathione content. Where, the compounds resulting from the oxidation of PAHs have the ability to
enter redox cycles, which increased the formation of reactive oxygen species (ROS) and thus caused sperm DNA damage. The data
provide strong evidence that semen samples containing a statistical threshold of 30% sperm DNA fragmentation have a reduced level
of pregnancy success. The results of the present study elucidated that there were DNA fragmentation from 32-40% in the sperm of
some idiopathic infertility subjects.