The expression of sperm-specific genes is necessary in spermiogenesis, and the genetic polymorphism of these genes may impair spermatogenesis, leading to male infertility. Mamy investigations have been conducted on the polymorphism of some candidate genes that are specifically expressed in spermiogenesis, the relation of genetic polymorphism with male infertility and its possible mechanism. Further attempts have been made at the explanation of the causes of infertility from the genetic angle.

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